The present invention is a flat immersion nozzle that stabilizes a molten metal surface or the like in a mold. The present invention is an immersion nozzle X in the interior of which is formed a molten steel flow passage 15 having upper end part that is an introduction port 11 and extending downward from the introduction part, the molten steel flow passage 15 and the outer shape of at least a lower part 13 of a pipe body 1 having a bottom part 2 each have a rectangular flat cross section, both side walls 131 on the short sides of the lower part 13 being formed parallel to the up-down direction direction center axis 151 of the molten steel flow passage 15, and a pair of discharge holes 16 communicating with the molten steel flow passage 15 being formed in the lower end parts of both side walls 131 on the short sides of the lower part 13 so as to face each other. The immersion nozzle X has a pair of guide plates 3 in the vicinity of the pair of discharge holes 16. The pair of guide plates 3 are formed so as to connect both side walls 132 on the long sides of the lower part 13 and guide, toward the pair of discharge holes 16, the molten steel flowing in the molten steel flow passage 15. When A is defined as the shortest interval between the pair of guide plates 3 in the long side direction and B is defined as the length of the molten steel flow passage 15 in the lower part 13 in the long side direction, A/B is 0.25 to 0.9.
Provided is a lower nozzle attachment/detachment device capable of reliably attaching and detaching a lower nozzle. The present invention provides a lower nozzle attachment/detachment device A for attaching and detaching a lower nozzle 72 made of refractory to or from a lower plate which is made of refractory and which is attached to a sliding nozzle device 7, the lower nozzle attachment/detachment device A including: a holding tool 1 that can be attached to and removed from a holding metal frame for holding the lower nozzle 72; a robot arm 2 having the holding tool 1 at a tip end thereof; a force sensor 3 for detecting a reaction force in a front-back direction and a reaction force in a rotation direction received by the holding tool 1 from the holding metal frame in conjunction with the operation of the robot arm 2; and a control unit 21 for monitoring and controlling the operation of the robot arm 2. The control unit 21 executes attachment/detachment of the lower nozzle 72 by controlling the operation of the robot arm 2 while monitoring each reaction force detected by the force sensor 3, and operating amounts of the robot arm in the front-back direction and the rotation direction.
The present invention provides a method for manufacturing an unfired basic brick having excellent corrosion resistance. In the present invention, water is added to a refractory starting material blend which contains a total of 0.2-30 mass% inclusive of magnesia having a particle size of less than 75 μm and/or magnesia chrome having a particle size of less than 75 μm, and 0.3-2.5 mass% inclusive of silica having a particle size of less than 75 μm. The resultant mixture is kneaded, press-molded and then subjected to a heat treatment at a temperature of 60-1000°C inclusive.
A stopper for continuous casting that is intended to prevent adhesion of inclusions to the vicinity of a fitting part of a stopper, and to prevent a nose region of the stopper from cracking or peeling off due to insufficient strength. The stopper for continuous casting includes a gas flow cavity in a vertically-extending central part thereof. In at least part of a vertical section of a nose periphery region of the stopper, a porous refractory material having a gas permeability is arranged on the side of an outer peripheral surface of the nose periphery region. A refractory material having higher strength than that of the porous refractory material is arranged on the side of an inner peripheral surface of the nose periphery region.
The present invention suppresses reduction in the discharge rate of gas discharged from a through-hole in an external insertion-type continuous-casting nozzle that is to be used under the condition of being fitted into a stopper. A continuous-casting nozzle according to the present invention is an external insertion-type continuous-casting nozzle A which is positioned below a stopper B for controlling the flow rate of molten steel in continuous casting of molten steel, to be fitted into the stopper B, and which is attachable and detachable from the outside of a molten steel receptacle, said nozzle being provided with a refractory nozzle body 1 that has vertically formed therein an inner hole 11 through which molten steel passes. The nozzle body 1 has integrally formed therein: an enlarged diameter section 12 which includes a fitting portion 121 to be fitted to the stopper B and in which the diameter of the inner hole 11 increases toward the upper end of the nozzle body 1; and a straight section 13 which continues downward from the lower end of the enlarged diameter section 12 and in which the inner hole 11 has a straight shape. A gas pool 14 is provided only to the straight section 13, and a through-hole 15, which is in communication with the gas pool 14 and through which gas is discharged from the enlarged diameter section 12, is provided to the nozzle body 1.
The present invention provides a magnesia-carbon brick having excellent spalling resistance even with a low graphite content and also having excellent corrosion resistance. The present invention pertains to a production method for a magnesia-carbon brick, the production method comprising: adding pitch-tar, which is pitch, diluted pitch obtained by diluting pitch with a solvent, tar, or diluted tar obtained by diluting tar with a solvent, as a binder to a refractory raw material blend containing at least 85 mass% of magnesia and having a graphite content of at most 12 mass% (including 0); kneading the resultant in a warm state; and then molding the resultant in a warm state, wherein the particle size constitution of the magnesia in the refractory raw material blend is such that the mass ratio of magnesia having a particle diameter of at least 1 mm to magnesia having a particle diameter of at least 0.075 mm and less than 1 mm is 0.2-1.5, and the mass ratio of magnesia having a particle diameter of at least 1 mm to magnesia having a particle diameter of less than 0.075 mm is at least 3.0.
The present invention provides a continuous casting nozzle with which it is possible to mitigate concentrations of stress in the neck part and inhibit slippage. The present invention is a continuous casting nozzle 1 including a nozzle body 2 made of a refractory material having, in the vertical direction, an internal hole 21 through which molten steel passes, wherein the nozzle body 2 includes a flange part 22 at the upper end, the flange part 22 including, on the outer side surface thereof, a tapered part 221 that inclines downwards towards the internal hole 21, and on the lower surface thereof, a horizontal part 222 that extends horizontally from the lower end of the tapered part 221 towards the internal hole 21. The continuous casting nozzle 1 further includes a metal case 3 covering the outer periphery of the flange part 22, the metal case 3 including a horizontal plate part 31 that faces the horizontal part 222 of the flange part 22 with mortar 4 of a given thickness interposed therebetween, a pressing force from an outer lower direction being received by the horizontal plate part 31.
The present invention provides: a wet spray material for firing furnaces, the wet spray material being capable of shortening the time required for a firing furnace to be in an operable state after the installation of the wet spray material on an installation object surface of the firing surface; and a method for installing this wet spray material for firing furnaces. According to the present invention, a silica sol and water are added to and kneaded with a refractory starting material that contains 55% by mass to 90% by mass of particles having a particle diameter of less than 1 mm, the kneaded material is pressure fed to a nozzle 2, a slurry or aqueous solution of at least one substance selected from among calcium hydroxide, magnesium hydroxide, calcium chloride, potassium chloride, magnesium chloride, sodium chloride, calcium sulfate, potassium sulfate, sodium sulfate, calcium nitrate, magnesium nitrate, sodium nitrate and potassium nitrate is added to the kneaded material in front of the nozzle 2 or in the nozzle 2, and the resulting material is sprayed onto an installation object surface S.
A mounting device capable of smoothly mounting a drive unit being in a hanging state to a sliding nozzle device, using a manipulator. The mounting device is mounted to a distal end of a manipulator to mount a drive unit whose upper end is connected to a suspending device, to a holder of a sliding nozzle device. The mounting device includes: a holding part for holding an upper portion or central portion (to-be-held plate) of the drive unit; and a contact part which is contactable with a lower portion (to-be-contacted part) of the drive unit when mounting the drive unit to the holder.
A sliding nozzle device capable of allowing a maintenance robot to reliably and accurately recognize the position thereof. The sliding nozzle device includes: a fixed metal frame; and a sliding metal frame slidably provided to the fixed metal frame. The fixed metal frame is provided with a mark block for allowing a maintenance robot to recognize the position thereof. More specifically, the mark block is provided to protrude from a side surface or bottom surface of the fixed metal frame toward the sliding metal frame, at a position free from interference with the sliding metal frame during sliding.
The purpose of the present invention is to achieve an immersion nozzle that is applied to an immersion nozzle exchange device, and that satisfies both suppression of crack occurrence in the neck part and suppression of subduction occurrence of the immersion nozzle. An immersion nozzle 10 according to the present invention has provided thereto a bridging member 15 disposed so as to bridge between the inner circumferential surface of a metal case 13A that surrounds a flange part 12 and the outer circumferential surface of a nozzle body part 11. One end of the bridging member 15 is fixed to the metal case 13A and the other end thereof is engaged with a recessed part 11c formed in the outer circumferential surface of the nozzle body part 11. Furthermore, in an area above the force point part where an upward support force is exerted by a supporting tool of the immersion nozzle exchange device, the outer circumferential surface of the nozzle body part 11, except for the recessed part 11c, is shaped so as to extend vertically without resulting in any dimensional change with respect to the center axis of an inner hole 11a.
The present invention suppresses the degradation of ejector effect in a spraying apparatus equipped with an ejector and can ensure a prescribed powder emission quantity. A spraying apparatus 1 according to the present invention is provided with: a storage means 20 for storing a powder 10; an ejector 30; a transportation tube 40 through which a mixture generated by the ejector is transported; and an emission means for emitting the mixture transported through the transportation tube 40. The ejector 30 is provided with: a container part 31 that has an internal space which is in communication with a dispensing port 21 of the storage means 20; and a jetting nozzle 32 that jets out a pressurized carrier gas from the leading end thereof into the internal space. The leading end of the jetting nozzle 32 is situated on the side closer toward the transportation tube 40 as compared with a vertical center line A passing through the center of the dispensing port 21. The minimum distance Y from the leading end of the jetting nozzle 32 to the inner circumference of the container part 31 is included within a range that satisfies 2X≤Y≤4.19ln(X)+26.74, where X represents the maximum particle diameter of the powder. The maximum particle diameter of the powder 10 is 0.03-5 mm.
B05B 7/14 - Appareillages de pulvérisation pour débiter des liquides ou d'autres matériaux fluides provenant de plusieurs sources, p. ex. un liquide et de l'air, une poudre et un gaz agencés pour projeter des matériaux en particules
B05B 7/30 - Appareillages dans lesquels des liquides ou d'autres matériaux fluides en provenance de différentes sources sont mélangés avant de pénétrer dans le dispositif d'évacuation dans lesquels un liquide ou autre matériau fluide est introduit ou attiré, en passant par un orifice, dans un courant de fluide porteur le premier liquide ou autre matériau fluide étant introduit par gravité ou aspiré dans le fluide porteur
16.
PLATE FOR SLIDING NOZZLE DEVICE, AND MANUFACTURING METHOD AND MANUFACTURING DEVICE FOR MANUFACTURING SAME
The present invention provides: a plate for a sliding nozzle device with which it is possible to inhibit fracturing or destruction of a plate body, and apply a greater restraining force on the plate body than in a conventional multiple hoop method; and a manufacturing method and a manufacturing device for manufacturing the same. In this plate for a sliding nozzle device, in which a hoop obtained by winding a strip-shaped thin iron sheet B in a plurality of layers is installed on the outer peripheral side surface of a plate body A1 made of a refractory, the maximum compressive strain of the inner peripheral surface of an inner hole in the plate body A1, obtained by a method for using a strain gauge to measure the strain released when the hoop is cut, is 200-1500 με inclusive. This plate can be obtained using a manufacturing device provided with a tightening mechanism 3 that includes a pressing jig 31 for holding the strip-shaped thin iron sheet B while being displaced along the outer peripheral side surface of the plate body A1, so that the strip-shaped thin iron sheet B follows the outer peripheral side surface of the plate body A1 at the portion at which the strip-shaped thin iron sheet B comes into contact with the outer peripheral side surface of the plate body A1.
The present invention provides a submerged nozzle replacement apparatus capable of quickly and easily moving a blank plate to a waiting position. A submerged nozzle replacement apparatus 1 of the present invention comprises: a pressing unit that presses a lower surface of a flange portion of a submerged nozzle 200; a guiding unit 4 for guiding the submerged nozzle to the pressing unit when the submerged nozzle 200 is mounted; an ejection portion 5 that guides the submerged nozzle 200 to a detaching position when the submerged nozzle is detached from the pressing unit; and a holding unit 6 that holds the blank plate 300. The holding unit 6 is movable to a first position in which the blank plate 300 is opposed to the submerged nozzle 200 supported on the pressing unit, and to a second position in which the lower surface of the flange portion of the submerged nozzle can be supported by the holding unit 6 and the guiding unit 4.
An objective of the present invention is to provide a pipe through which fluids can flow, in which thermal insulation in a space between an inner wall and an outer wall is achieved at low cost and high performance. The thermal insulation pipe of the present invention is a thermal insulation pipe formed by a double wall pipe of an inner pipe and an outer pipe. A thermal-insulating material to be filled in a space between the inner pipe and the outer pipe is made from an aerogel having a three-dimensional network structure with a framework constituted by a cluster of aggregation of primary particles. The thermal-insulating material includes fine particles having a three-dimensional network structure with a framework of the primary particles. A preferred form of such a thermal-insulating material is weakly bonded aerogel ultrafine particle generated by crushing at ultra-high speed a low-binding ultrafine aerogel generated from an aerogel with aging conditions during manufacturing process set to a low temperature and short time period.
The present invention improves the corrosion resistance and thermal shock resistance of a refractory product for use in continuous casting and a refractory product member. The refractory product according to the present invention contains a free carbon component in an amount of 10% by mass to 30% by mass inclusive, in which the remaining main mineral phase comprises at least one component selected from corundum, spinel and periclase. In the refractory product, the content of the periclase is less than 40% by mass and the total content of a silica component and a silicon carbide component is less than 15% by mass. When the proportion of a part excluding a structure composed of the free carbon component from a structure of the refractory product is defined as 100% by volume, refractory product particles each having a particle diameter of more than 0.3 mm account for 20% by volume or more and refractory product particles each having a particle diameter of 0.045 mm or less account for 3% by volume to 30% by volume inclusive. With respect to a coarse particle having at least the largest particle size among the refractory product particles in the refractory product, an approximately continuous void layer having a shape similar to the shape of the coarse particle is present around the coarse particle. The refractory product has an apparent porosity of 16% or less and a maximum thermal expansion ratio at a temperature up to 1500°C is 0.6% or less.
The present invention improves the corrosion resistance and thermal shock resistance of a refractory product for use in continuous casting of a zirconia-carbonaceous material and a refractory product member. The refractory product according to the present invention contains a free carbon component in an amount of 8% by mass to 16% by mass inclusive, in which the remaining main component comprises a zirconia component and the total content of another components other than the free carbon component and the zirconia component is less than 5% by mass. When the proportion of a part excluding a structure composed of the free carbon component from a structure of the refractory product is defined as 100% by volume, refractory product particles each having a particle diameter of more than 0.3 mm account for 5% by volume or more and refractory product particles each having a particle diameter of 0.045 mm or less account for 5% by volume to 40% by volume inclusive. With respect to a coarse particle having at least a largest particle size among the refractory product particles in the refractory product, an approximately continuous void layer having a shape similar to the shape of the coarse particle is present around the coarse particle. The refractory product has an apparent porosity of 16% or less and a maximum thermal expansion ratio at a temperature up to 1500°C is 0.6% or less.
Provided is a sliding nozzle apparatus capable of preventing a sliding metal frame from falling down when the sliding metal frame is opened in the uppermost position where the sliding metal frame is moved to the uppermost side. The sliding nozzle apparatus S of the present invention comprises a fixed metal frame 1, and a sliding metal frame 2 which is provided openable-closable and slidable with respect to the fixed metal frame 1, wherein when the sliding metal frame 2 is opened, the sliding nozzle apparatus is erected such that a sliding direction of the sliding metal frame 2 is oriented in a vertical direction, wherein the fixed metal frame 1 is provided with a fall prevention member 9, and the sliding metal frame 2 is provided with an engagement member 7, wherein the fall prevention member 9 has a catching surface 91 for catching the engagement member 7 when the sliding metal frame 2 is opened, in the uppermost position where the sliding metal frame 2 is moved to the uppermost side in a state in which the sliding nozzle apparatus is erected such that the sliding direction of the sliding metal frame 2 is oriented in the vertical direction.
The present invention provides a sliding nozzle apparatus in which components constituting the sliding nozzle apparatus are less likely to be damaged even when a surface pressure is loaded with no refractory plate mounted. The sliding nozzle apparatus of the present invention comprises a fixed metal frame 1 and a sliding metal frame 2 which is slidably provided with respect to the fixed metal frame 1, wherein the sliding metal frame 2 is movable between a first position where, in a state where two refractory plates are mounted, respectively, in a plate-receiving recess 11 of the fixed metal frame 1 and a plate-receiving recess of the sliding metal frame, a surface pressure can be loaded between the two refractory plates, and a second position where, in a state where no refractory plate is mounted to either the plate-receiving recess 11 of the fixed metal frame 1 or the plate-receiving recess of the sliding metal frame 2, a surface pressure can be loaded between the fixed metal frame 1 and the sliding metal frame 2.
B22D 41/24 - Fermetures du type à tiroir, c.-à-d. comportant une plaque fixe et une plaque mobile en contact mutuel et dont le glissement permet de faire varier la section de passage caractérisées par une plaque se déplaçant de façon rectiligne
B22D 41/34 - Leurs moyens de support, de fixation ou de centrage
B22D 41/40 - Moyens pour appliquer les plaques les unes contre les autres
The present invention provides a sliding nozzle apparatus in which components constituting the sliding nozzle apparatus are less likely to get damaged even in a case where a surface pressure is applied while no refractory plate is mounted thereon. The sliding nozzle apparatus according to the present invention comprises a fixed metal frame 1 and a slide metal frame 2 which is slidably provided to the fixed metal frame 1. The slide metal frame 2 is capable of moving to: a first position where, in a state where refractory plates are respectively mounted in a plate accommodation part 11 of the fixed metal frame 1 and a plate accommodation part of the slide metal frame, a surface pressure can be applied between the respective refractory plates; and a second position where, in a state where no refractory plates are mounted to the plate accommodation part 11 of the fixed metal frame 1 or the plate accommodation part of the slide metal frame 2, a surface pressure can be applied between the fixed metal frame 1 and the slide metal frame 2.
B22D 41/24 - Fermetures du type à tiroir, c.-à-d. comportant une plaque fixe et une plaque mobile en contact mutuel et dont le glissement permet de faire varier la section de passage caractérisées par une plaque se déplaçant de façon rectiligne
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
B22D 41/34 - Leurs moyens de support, de fixation ou de centrage
B22D 41/40 - Moyens pour appliquer les plaques les unes contre les autres
F27D 3/14 - Chargement ou déchargement d'un matériau liquide ou fondu
Provided is a sliding nozzle apparatus capable of preventing a slide metal frame from falling when the slide metal frame is opened at a highest position which is a position where the slide metal frame is moved to the uppermost side. A sliding nozzle apparatus S of the present invention comprises a fixed metal frame 1, and a slide metal frame 2 installed so as to be able to be opened and closed, and slide with respect to the fixed metal frame 1. The sliding nozzle apparatus S is placed upright so that a sliding direction of the slide metal frame 2 when opening the slide metal frame 2 is vertical. The fixed metal frame 1 is provided with a fall prevention member 9, and the slide metal frame 2 is provided with a lock member 7. The fall prevention member 9 has a lock surface 91 that locks the lock member 7 when the slide metal frame 2 is opened at the highest position, which is a position where the slide metal frame 2 is moved to the uppermost side, in a state in which the sliding direction of the slide metal frame 2 is set to be vertical.
3422232334344, each measured by powder X-ray diffractometry. The probe-guiding part of the present invention is provided with a plate-shaped body portion using the aforesaid silicon nitride composite material and a plurality of through holes and/or slits through which a probe is inserted in the main body portion.
Provided is a dielectric for an electrostatic chuck, which is capable of ensuring sufficient hardness, while ensuring basic properties, such as intrinsic volume resistivity, required for a dielectric for a Johnson-Rahbek type electrostatic chuck. The dielectric has a main crystal phase consisting of corundum, wherein the dielectric includes Al5BO9 as another crystal phase, and wherein a ratio IA/IB, where IA denotes a (021) peak intensity of Al5BO9 as measured by powder X-ray diffraction, and IB denotes a (012) peak intensity of corundum as measured by powder X-ray diffraction, is in the range of 0.04 to 0.4.
C04B 35/01 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes
H01J 37/32 - Tubes à décharge en atmosphère gazeuse
H01L 21/683 - Appareils spécialement adaptés pour la manipulation des dispositifs à semi-conducteurs ou des dispositifs électriques à l'état solide pendant leur fabrication ou leur traitementAppareils spécialement adaptés pour la manipulation des plaquettes pendant la fabrication ou le traitement des dispositifs à semi-conducteurs ou des dispositifs électriques à l'état solide ou de leurs composants pour le maintien ou la préhension
C04B 41/00 - Post-traitement des mortiers, du béton, de la pierre artificielle ou des céramiquesTraitement de la pierre naturelle
2233 having a particle size of less than 75 μm. In addition, fine powders of one or more basic compounds selected from magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium nitrate, calcium oxide, calcium carbonate, calcium sulfate, and calcium nitrate having a particle size of less than 75 μm are included in a total amount of 0.1-5% by mass in the raw material blend. One or more compounds selected from alkali silicates and alkali phosphates are used as a binder, and the amount of cement used is limited to 5% by mass or less.
A bubbling plate for a sliding nozzle includes a plate body defining an inner hole therein and a gas-permeable ring installed inside the plate body to define part of the inner hole. The ring has a lower end surface formed with a stepped part, a convex part or a concave part; and the plate body has an upper surface in contact with the lower end surface with the upper surface formed with a stepped part, a concave part or a convex part capable of being opposed to and fittingly engaged with a corresponding part of the ring. The area in which the part of the ring is fittingly engaged with the corresponding part of the plate body has a length of 2 mm or more along a direction of a central axis of the inner hole, and mortar is interveningly provided in at least a longitudinally-extending joint part in the fitting engagement area.
Provided is a refractory product which is not impregnated with pitch or the like, wherein it has higher corrosion-erosion resistance and thermal shock resistance as compared to a refractory product subjected to pitch or the like-impregnation treatment. The refractory product which is not impregnated with tar or pitch is characterized in that, in terms of values of physical properties of a sample of the refractory product as measured after heat-treating the sample in a non-oxidizing atmosphere at 1200° C.: an apparent porosity is 7% or less; a total void volume of pores having a pore diameter of 1 μm or less is 80% or more of an integrated void volume of pores of the entire sample of the refractory product; and a gas permeability is 50×10−17 m2 or less.
An immersion nozzle exchanging apparatus and an upper nozzle capable of preventing damage to a plate of the upper nozzle are provided. An immersion nozzle exchanging apparatus 1 is mounted on a lower portion of a molten steel outlet 101 of a tundish 100. The immersion nozzle exchanging apparatus 1 includes a support 3 and a flap 4. The support 3 has a support surface 31 to support a lower surface of a plate 201 of an upper nozzle 200 inserted into the molten steel outlet 101. The flap 4 is rotatable with respect to the support 3. The immersion nozzle exchanging apparatus 1 further includes a rotation stopper 8 for the flap 4. The rotation stopper 8 includes a wedge 81 to abut against the flap 4 by projecting to an upper side of the flap 4, and a bolt 83 connected to the wedge 81, and enables adjustment of a projection amount of the wedge 81 by adjusting a fastening amount of the bolt 83.
The present invention provides an insulation block for a skid pipe that is not easily damaged when installed around a skid pipe, and a method for constructing the insulation block. An insulation block (3) for a skid pipe according to the present invention includes a through-hole (35) penetrating from an outer circumferential surface of an insulation block body (31) to an inner circumferential surface thereof, wherein a retainer (6) is attached to the through-hole (35), the retainer (6) having an insertion hole for inserting a stud, the insertion hole being connected to the through-hole (35). The construction method according to the present invention includes: the steps for placing the insulation block (3) around a skid pipe; welding the stud to the skid pipe through the through-hole (35) and the insertion hole; filling the through-hole (35) with a sealing material; and pouring an insulating castable material between the skid pipe and the insulation block (3).
The present invention provides a heat-insulating block structure for skid posts, by which rotation of constructed heat-insulating blocks can be suppressed, and a construction method thereof. This heat-insulating block structure for a skid post is constructed by assembling three kinds of heat-insulating blocks, namely, bottom heat-insulating blocks (3) disposed at the bottom, middle heat-insulating blocks (4) stacked in one or more stages on top of the bottom heat-insulating blocks, and top heat-insulating blocks (5) disposed on top of the middle heat-insulating blocks (4), in a stacked manner around a skid post (11). The bottom heat-insulating blocks have a concave part in the center of an upper surface thereof, and convex parts at both edges thereof; the middle heat-insulating blocks have a concave part in the center of upper and lower surfaces thereof, and convex parts at both edges thereof; the top heat-insulating blocks have a concave part in the center of a lower surface thereof, and convex parts at both edges thereof; the convex part of the adjoining two bottom heat-insulating blocks is fitted in the concave part of the lower surface of the bottom middle heat-insulating blocks; and the convex part of the upper surface of the adjoining two top middle heat-insulating blocks is fitted in the concave part of the top heat-insulating blocks.
The purpose of the present invention is to suppress adhesion of an intrusive element near a fitting section of a stopper, and to prevent a tip region of the stopper from cracking or delaminating due to a lack of strength. To achieve the foregoing, the present invention provides a stopper 1 for continuous casting that comprises a cavity 11 for gas distribution in the center thereof in a vertical direction, wherein: the stopper has a porous refractory material 12, which is gas-permeable, and a refractory material 13, which has a higher strength than the porous refractory material 12, disposed on an outer peripheral surface side and on an inner peripheral surface side, respectively, of at least a portion of a vertical cross-section of a tip-side region C.
Provided is a ZrO2—CaO—C based refractory material which is capable of maintaining high adhesion resistance over a long period of time, while exhibiting significant slaking resistance, and suppressing self-fluxing, i.e., exhibiting corrosion-erosion resistance. The refractory material comprises a CaO—ZrO2 composition containing a CaO component in an amount of 40% by mass to 60% by mass, wherein a mass ratio of the CaO component to a ZrO2 component is 0.67 to 1.5, and wherein the CaO—ZrO2 composition includes a eutectic microstructure of CaO crystals and CaZrO3 crystals, wherein a width of each of the CaO crystals observable in a cross-sectional microstructure is 50 μm or less.
C04B 35/484 - Réfractaires obtenus par coulée par fusion
C04B 35/057 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes à base d'oxyde de magnésium, d'oxyde de calcium ou de mélanges d'oxydes dérivés de la dolomite à base d'oxyde de calcium
C04B 35/653 - Procédés comportant une étape de fusion
C04B 41/50 - Revêtement ou imprégnation avec des substances inorganiques
A sliding nozzle apparatus, configured to allow a drive unit to be attached to and detached from a slide metal frame, efficiently transmits a driving force of the drive unit to the slide metal frame. The sliding nozzle apparatus comprises a connection component attached to a slide metal frame and configured for connection with a drive unit. The connection component is provided with an opening with respect to which the drive unit can be attached and detached. The connection component is configured to allow the opening to be switched between a first position where the opening faces in the same direction as an opening-closing direction of the slide metal frame, and a second position where the opening faces in the same direction as an attaching-detaching direction of the drive unit.
A technical problem to be solved by the present invention is to provide a mounting device capable of smoothly mounting a drive unit being in a hanging state to a sliding nozzle device, using a manipulator. The present invention provides a mounting device 4 mounted to a distal end of a manipulator 4 to mount a drive unit 31b whose upper end is connected to a suspending device, to a holder 36 of a sliding nozzle device 3. The mounting device 5 comprises: a holding part 52 for holding an upper portion or central portion (to-be-held plate 313) of the drive unit 31b; and a contact part 55c which is contactable with a lower portion (to-be-contacted part 314) of the drive unit 31b when mounting the drive unit 31b to the holder.
The present invention addresses the problem of providing an attachment device with which a driving device in a hanging state can be smoothly attached to a sliding nozzle device, using a manipulator. The present invention provides an attachment device 5 that is attached to an end of a manipulator 4 and that is used to attach a driving device 31b, which is connected to a hanging device at the upper end thereof, to a holder 36 of a sliding nozzle device 3. The attachment device 5 includes a holding part 52 that holds an upper section or a middle section (holding plate 313) of the driving device 31b, and a contact part 55c that can come into contact with a lower section (contact part 314) of the driving device 31b when the driving device 31b is to be attached to the holder.
A technical problem to be solved by the present invention is to provide a sliding nozzle device capable of allowing a maintenance robot to reliably and accurately recognize the position thereof. The present invention provides a sliding nozzle device 3 comprising: a fixed metal frame 32; and a sliding metal frame 33 slidably provided to the fixed metal frame 32, wherein the fixed metal frame 32 is provided with a mark block 38a for allowing a maintenance robot to recognize the position thereof. More specifically, the mark block 38a is provided to protrude from a side surface or bottom surface of the fixed metal frame 32 toward the sliding metal frame 33, at a position free from interference with the sliding metal frame 33 during sliding.
The present invention addresses the problem of providing a sliding nozzle apparatus whereby a maintenance robot can be caused to reliably and accurately recognize the position of the sliding nozzle apparatus. The gist of the present invention resides in: a sliding nozzle apparatus 3 comprising a fixed metal frame 32 and a sliding metal frame 33 that is provided so as to be able to slide in relation to the fixed metal frame 32, wherein a mark block 38a for causing a maintenance robot to recognize a position is provided to at least the fixed metal frame 32; and more specifically in the feature wherein the mark block 38a protrudes toward the sliding metal frame 33 from a side surface or the bottom surface of the fixed metal frame 32, and is provided in a position in which the mark block 38a does not interfere with the sliding metal frame 33 during sliding of the sliding metal frame 33.
The present invention is an aerogel composite molded body which has low thermal conductivity and in which the occurrence of defects in the molded body is reduced. The gist of the present invention is an aerogel composite molded body obtained by pressure molding a raw material blend that contains an aerogel powder and a silica ultrafine powder other than the aerogel powder, and a heat insulating material equipped with the aerogel composite molded body. The aerogel powder has a median diameter of 1-45 μm (inclusive), and the raw material blend contains 1-55 mass% (inclusive) of the aerogel powder.
The purpose of the present invention is to provide a pipe for passing a fluid therethrough, with which heat insulation can be achieved in a space between an inner wall and an outer wall, which are formed by doubling an outer wall of the pipe, with low cost and high performance. A heat insulating pipe according to the present invention is formed as a double pipe composed of an inner pipe and an outer pipe, and a heat insulating material filling a space between the inner pipe and the outer pipe is formed from an aerogel having a three-dimensional network structure with a skeleton formed of clusters being aggregates of primary particles, and includes fine particles having a three-dimensional network structure with a skeleton formed of the primary particles. A preferred form of such a heat insulating material is a weakly-bonded ultra-fine particle aerogel powder generated by grinding at extremely high speed a weakly-bonded ultra-fine particle aerogel generated from an aerogel with aging conditions during the production process set to a low temperature and a short time period.
It is intended to provide a flat immersion nozzle capable of stabilizing a molten steel discharge flow to stabilize an in-mold bath surface, i.e., reduce the fluctuation of the in-mold bath surface. Provided is an immersion nozzle having a flat portion whose inner bore has a thickness and a width greater than the thickness, wherein two lateral protrusions each protruding in a thickness direction are provided on each of opposed walls of the flat portion extending in a width direction. The lateral protrusions are arranged at axial symmetrical positions with respect to a longitudinal central axis of the width-directionally extending walls, in pairs, such that each of them extends obliquely downwardly in the width direction, wherein two pairs of the lateral protrusions are arranged, respectively, on the opposed width-directionally extending walls, in opposed relation.
Provided is a nozzle or a stopper having a gas blowing function, which is capable of preventing irregular breaking to be triggered by a gas outlet or a gas passage path communicated with the gas outlet, or, even in the event of breaking, preventing expansion of the breaking, and a combination of the nozzle and the stopper. The nozzle comprises: a fitting engagement region refractory material layer composed of a fitting engagement region refractory material; a nozzle body composed of a different refractory material from the fitting engagement region refractory material (main body refractory material); and a gas outlet provided in at least one boundary area between the fitting engagement region refractory material layer and the main body refractory material in a surface of the nozzle contactable with molten steel.
B22D 41/58 - Buses de coulée avec des moyens d'injection de gaz
B22D 41/16 - Fermetures du type quenouilles de coulée, c.-à-d. la tige de fermeture étant mise en place vers le bas à travers le récipient et le métal qu'il contient, pour faire varier la section de passage du métal dans l'ouverture de coulée
Provided are a plate holding device, a plate detaching apparatus, a plate attaching apparatus and a plate attaching-detaching apparatus which are capable of reliably attaching and/or detaching a plate with respect to a plate-receiving metal frame. The plate holding device comprises: a plurality of holding members for holding a plate for a sliding nozzle device; widening and narrowing mechanisms to selectively widen and narrow a distance between the holding members; a pressing unit for pressing a central region of the plate when the plate is held by the holding members; and a force sensor for detecting a force received by the holding members and/or the pressing unit from the held plate. The plate holding device is configured to be mounted to a distal end of a robot arm.
The precision of grasping or controlling backpressure around a gas discharge portion in a stopper for continuous casting can be improved with a stopper for continuous casting which includes a cavity for conveying gas in a vertical direction center of the stopper, one or a plurality of gas discharge holes passing through from the cavity to the outside in a distal center or a side surface of a reduced-diameter region including a fitted portion to a lower nozzle, and a pressure control component in a part of an area above the gas discharge hole within the cavity.
A spray material for hot and dry spray application with improved corrosion resistance, and a hot and dry spray application method with improved corrosion resistance. A hot and dry spray application method comprises pressure-feeding a mixture comprising a refractory material and a binder, toward a spraying nozzle via a pipe, and adding water to the mixture at a distal end of the spraying nozzle to apply a spray under a hot condition. The mixture contains magnesium limestone having a particle size of 0.075 mm to less than 1 mm, in an amount of 10 mass % to 50 mass %, in 100 mass % of a total amount of the refractory material and the binder. The content of magnesium limestone having a particle size of less than 0.075 mm in 100 mass % of the total amount of the refractory material and the binder is 35 mass % or less (including 0).
C04B 28/34 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des liants phosphate froids
F27D 1/16 - Confection ou réparation des garnissages
An opening-closing apparatus capable of, when using a robot arm to selectively open and close a component of a sliding nozzle device, reliably opening and closing the component to respective given positions. The apparatus comprises: a hand-like distal module engageable with an openable-closable component of a sliding nozzle device; a force sensor to detect a force received by the module; and a robot arm to which the module and the sensor are mounted. The robot arm is controllably operated to: move the module toward the component of the sliding nozzle device and engage the module with the component of the sliding nozzle device; then move the module to move the component, if the absolute value of the force detected by the sensor is equal to or less than a given threshold; and stop the movement of the module, when the absolute value of the force detected by the sensor reaches the threshold.
H01L 21/683 - Appareils spécialement adaptés pour la manipulation des dispositifs à semi-conducteurs ou des dispositifs électriques à l'état solide pendant leur fabrication ou leur traitementAppareils spécialement adaptés pour la manipulation des plaquettes pendant la fabrication ou le traitement des dispositifs à semi-conducteurs ou des dispositifs électriques à l'état solide ou de leurs composants pour le maintien ou la préhension
50.
Certain-shaped joint material for hot installation
It is intended to suppress flaming and smoking due to combustion of combustible substances in a certain-shaped joint material, while maintaining hot sealability of the certain-shaped joint material. A certain-shaped joint material for hot installation is obtained by: adding organic additives to a blend in a combined amount of 26 mass % to 50 mass %, with respect to and in addition to 100 mass % of the blend, wherein the blend comprises 50 mass % to 90 mass % of gibbsite type aluminum hydroxide raw material, 1 mass % to 9 mass % of clay, and 9 mass % to 23 mass % of graphite, with the remainder mainly composed of an additional refractory raw material; and subjecting the resulting mixture to kneading, forming and drying.
The present invention provides an integrated tuyere for a converter, in which one double metal tube and a tuyere refractory are integrated, said integrated tuyere having a simple structure and suppressing deformation of the double metal tube upon installation in a converter and during handling and a reduction in the gas flow rate due to damage. The integrated tuyere for a converter according to the present invention is provided with: a double metal tube 3 which has an inner tube 31 and an outer tube 32, the inner tube 31 being loaded with a refractory 35; a tuyere refractory 2, in a through-hole in which 21 the double metal tube 3 is fixed with an adhesive 22 in between; and a metal case 4 which has a bottom plate 41 that covers the bottom face of the tuyere refractory 2 and a side plate 43 that covers a lower side face of the tuyere refractory 2. The metal case 4 has a thickness T of 6 to 20 mm and a length L of 3% to 50% of the total length of the tuyere refractory. The outer tube 32 of the double metal tube has an upper outer tube 321 and a lower outer tube 322. The lower outer tube 322 has a thickness of 3 mm or more and is welded/fixed to the bottom plate 41 of the metal case.
The objective of the present invention is to prevent penetration of molten steel into a gas pool in a bubbling plate having a structure in which a ring is disposed in an inner bore of a plate main body. In a bubbling plate according to the present invention, a ring-shaped component (ring 3) having a gas permeation function is fitted into an inner hole 2d of a plate main body 2, in a bubbling plate 1 for a sliding nozzle used in continuous casting of steel. A stepped portion 3a, or a protruding portion or a recessed portion, is provided in a lower end surface of the ring 3, and a stepped portion 2a, or a recessed portion or a protruding portion, which opposes and is capable of engaging with the stepped portion 3a, or the protruding portion or the recessed portion, is provided in an upper surface of the plate main body 2 that is in contact with the lower end surface of the ring 3. A part (mating portion A) where the stepped portion 3a, or the protruding portion or the recessed portion, on the ring 3 side and the stepped portion 2a, or the recessed portion or the protruding portion, on the plate main body 2 side mate with one another has a length of at least 2 mm in the central axis direction of the inner bore 2d (vertical direction), and mortar is interposed in at least a vertical direction joint portion of the mating portion A.
Industrial furnaces; shaped fittings for furnaces; ceramic
shelves as accessories for calcining kilns for industrial
purposes; ceramic setters for industrial furnaces; shaped
fittings for industrial furnaces.
Provided is a refractory product which is not impregnated with pitch or the like, wherein it has higher corrosion-erosion resistance and thermal shock resistance as compared to a refractory product subjected to pitch or the like-impregnation treatment. The refractory product which is not impregnated with tar or pitch is characterized in that, in terms of values of physical properties of a sample of the refractory product as measured after heat-treating the sample in a non-oxidizing atmosphere at 1200°C: an apparent porosity is 7% or less; a total void volume of pores having a pore diameter of 1 µm or less is 80% or more of an integrated void volume of pores of the entire sample of therefractory product; and a gas permeability is 50 × 10?17 m2 or less.
The present invention provides a refractory material which does not impregnate a pitch or the like, and has high corrosion resistance and thermal shock resistance as compared with an impregnated product such as a pitch. A refractory material that does not impregnate a tar or pitch, according to the present invention, is characterized by having, as physical property values of a refractory material sample which is heat-treated in a non-oxidizing atmosphere at 1200 °C, an apparent porosity of at most 7%, the total pore volume of pores having a pore diameter of at most 1 μm of at least 80% with respect to the integrated pore volume of the entity of the refractory material sample, and a permeability of 50×10-17m2.
It is intended to provide a method for forming a brick lining to construct a sidewall of a kiln/furnace, while improving efficiency of brick lining forming work without causing any increase in manufacturing cost of bricks to be used. The brick lining forming method comprises stacking a plurality of tiers of bricks, respectively, on a plurality of tier regions of an inner surface of a hollow approximately cylindrical-shaped peripheral portion of a kiln/furnace to construct a side wall of the kiln/furnace, wherein two or more of the plurality of tier regions are different in terms of pre-lining radius, wherein only bricks identical in terms of taper angle and height dimension are used, except for an adjustment brick, in each of the two or more tier regions different in terms of the pre-lining radius, wherein bricks identical in terms of the taper angle, the height dimension and length dimension, and different in terms of back face width, are used in at least a part of each of the two or more tier regions.
The present invention provides a ZrO2-CaO-C refractory material that has prominent consumption resistance and suppressed self-fluxing properties, i.e., is corrosion-resistant while also being capable of sustaining high adhesion resistance over extended periods of time. The present invention pertains to: a CaO-ZrO2 composition which contains 40% by mass to 60% by mass of a CaO component, has a CaO/ZrO2 component mass ratio of 0.67 to 1.5, and comprises a eutectic structure of CaO crystals and CaZrO3 crystals, and in which the width of observable CaO crystals in the cross-sectional structure is 50 ?m or less; and a refractory material containing this CaO-ZrO2 composition.
B22D 41/54 - Leur fabrication ou leur remise en état caractérisées par le matériau utilisé à cet effet
C04B 35/057 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes à base d'oxyde de magnésium, d'oxyde de calcium ou de mélanges d'oxydes dérivés de la dolomite à base d'oxyde de calcium
F27D 3/14 - Chargement ou déchargement d'un matériau liquide ou fondu
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
B22D 41/54 - Leur fabrication ou leur remise en état caractérisées par le matériau utilisé à cet effet
C04B 35/03 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes à base d'oxyde de magnésium, d'oxyde de calcium ou de mélanges d'oxydes dérivés de la dolomite
C04B 35/484 - Réfractaires obtenus par coulée par fusion
60.
TUNDISH NOZZLE STRUCTURE AND CONTINUOUS CASTING METHOD
Provided are a tundish nozzle structure and a continuous casting method with which it is possible to cause inclusions in a tundish to rise. In the present invention, a sword-guard-shaped article 12 is provided to part or the entirety of the outer periphery of an upper-end part of a tundish nozzle 11, the sword-guard-shaped article 12 being larger than the outer contour of the tundish nozzle upper-end part. In addition, one or a plurality of gas discharge holes 13a are provided to one or a plurality of surfaces from among the lower surface of the sword-guard-shaped article 12, the outer-peripheral surface of the sword-guard-shaped article 12, the upper surface of the sword-guard-shaped article 12, and the outer-peripheral surface of the tundish nozzle 11 that is lower than the sword-guard-shaped article 12. Adjusting the length L of the tundish nozzle structure causes substantially all gas to rise, or adjusts the flow rate of gas downward on an inner-hole side and the amount of gas that rises.
B22D 41/16 - Fermetures du type quenouilles de coulée, c.-à-d. la tige de fermeture étant mise en place vers le bas à travers le récipient et le métal qu'il contient, pour faire varier la section de passage du métal dans l'ouverture de coulée
B22D 41/58 - Buses de coulée avec des moyens d'injection de gaz
A technical problern to be solved by the present invention is to, in a sliding nozzle apparatus configured to allow a drive unit to be attached to and detached from a slide metal frame, make it possible to efficiently transmit a driving force of the drive unit to the slide metal frarne. The present invention provides a sliding nozzle apparatus cornprising a connection component 4 attached to a slide metal frame 112 and configured for connection with a drive unit 12, wherein the connection component 4 is provided with an opening with respect to which the drive unit 12 can be attached and detached. The connection cornponent is configured to allow the opening to be switched between a first position where the opening faces in the same direction as an opening- closing direction of the slide metal frame 112, and a second position where the opening faces in the same direction as an attaching-detaching direction of the drive unit 12.
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
B22D 41/22 - Fermetures du type à tiroir, c.-à-d. comportant une plaque fixe et une plaque mobile en contact mutuel et dont le glissement permet de faire varier la section de passage
B22D 41/34 - Leurs moyens de support, de fixation ou de centrage
The present invention addresses the problem of enabling efficient transmission of propulsive force of a drive unit to a slide metal frame in a sliding nozzle device in which the drive unit can be attached to and detached from the slide metal frame. In the sliding nozzle device according to the present invention, a connection component 4 for connection to a drive unit 12 is attached to a slide metal frame 112, and an opening that allows attachment and detachment of the drive unit 12 is provided in the connection component 4. This opening can be switched between a first position facing the same direction as an opening/closing direction of the slide metal frame 112 and a second position facing the same direction as an attachment/detachment direction of the drive unit 12.
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
B22D 41/22 - Fermetures du type à tiroir, c.-à-d. comportant une plaque fixe et une plaque mobile en contact mutuel et dont le glissement permet de faire varier la section de passage
B22D 41/34 - Leurs moyens de support, de fixation ou de centrage
63.
Method for spray application of monolithic refractory and spray material for use therein
To improve the stability of spray application of a monolithic refractory in which a water injector is disposed in a material carrier pipe extending from a material supply device to a distal spray nozzle, and application water is injected from the water injector into a spray material that is being carried through the material carrier pipe, a ratio of a flow volume of an application water carrier gas for carrying the application water to be introduced into the water injector to a flow volume of a spray material carrier gas for carrying the spray material is set to 0.07 to 2, and a compressibility index of the spray material is set to 32% or less. Alternatively, a ratio of a flow volume of an application water carrier gas for carrying the application water to be introduced into the water injector to an application water volume is set to 100 to 1,000.
C04B 35/66 - Réfractaires monolithiques ou mortiers réfractaires, y compris ceux contenant de l'argile
B05B 7/24 - Appareillages de pulvérisation pour débiter des liquides ou d'autres matériaux fluides provenant de plusieurs sources, p. ex. un liquide et de l'air, une poudre et un gaz avec des moyens, p. ex. un récipient, pour alimenter en liquide ou autre matériau fluide un dispositif de décharge
B05D 1/02 - Procédés pour appliquer des liquides ou d'autres matériaux fluides aux surfaces réalisés par pulvérisation
C04B 35/622 - Procédés de mise en formeTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques
C04B 35/626 - Préparation ou traitement des poudres individuellement ou par fournées
This invention provides a thermal spraying method with which it is possible to control decreases in adhesion, wear in delivery pipes, and occurrences of flashback when performing a large volume injection. This thermal spraying method is for forming a refractory composition by injecting and combusting a mixture in which a raw powder material containing a refractory powder and a flammable powder is mixed with an oxidizing carrier gas. The flow rate of the carrier gas discharged from a discharge nozzle 32 of an ejector 30 is 30 (Nm3/h) or greater, the flow speed of the carrier gas discharged from the discharge nozzle 32 is 602-1180 (m/s), the flow speed of the mixture in a channel of a delivery pipe 33 is 63-283 (m/s), and the ratio of the cross-sectional area of the injection port 41 of an injection means 40 and the straight portion of the discharge pipe 33 (cross-sectional area of the injection port of the injection means/cross-sectional area of the straight portion of the discharge pipe) is 1-4.
C23C 4/12 - Revêtement par pulvérisation du matériau de revêtement à l'état fondu, p. ex. par pulvérisation à l'aide d'une flamme, d'un plasma ou d'une décharge électrique caractérisé par le procédé de pulvérisation
B05B 7/20 - Appareillages de pulvérisation pour débiter des liquides ou d'autres matériaux fluides provenant de plusieurs sources, p. ex. un liquide et de l'air, une poudre et un gaz comportant des moyens pour chauffer la matière à projeter sous l'action d'une flamme ou par combustion
The present invention provides a precast block for a coke oven, which exhibits sufficient fluidity during pouring construction. This precast block for a coke oven is mainly composed of an amorphous silica raw material, and where the content ratio of a siliceous raw material having a particle size of less than 10 μm in 100% by mass of a siliceous raw material containing the amorphous silica raw material is denoted by A (% by mass), and the content ratio of a siliceous raw material having a particle size of less than 1 μm is denoted by B (% by mass), A is 15-19 (% by mass) and B/A × 100 is 45-85.
The present invention provides a device for opening/closing which can reliably open/close the opening/closing part of a sliding nozzle device to a predetermined position using a robot arm. The device for opening/closing according to the present invention is configured by providing a hand end part 2 and a force sensor 10 on a robot arm 15. The hand end part 2 is engaged with the opening/closing part of a sliding nozzle device 14. The force sensor 10 detects the force that the hand end part receives. Under the operation control of the robot arm 15, the hand end part 2 is moved toward the opening/closing part of the sliding nozzle device and engaged with the opening/closing part of the sliding nozzle device, the hand end part 2 is moved to move the opening/closing part if the absolute value of the force detected by the force sensor 10 is equal to or less than a predetermined threshold, and the movement of the hand end part 2 is stopped when the absolute value of the force detected by the force sensor 10 reaches the predetermined threshold.
The present invention provides a nozzle and a structure of the nozzle and a stopper that make it possible to prevent irregular fracture from a gas discharge port or a gas passage path communicating therewith as a starting point, or to prevent the originated fraction from expanding in a nozzle or a stopper having a gas discharge function. According to this invention, a nozzle 2 comprises a fitting area refractory layer 5A in a fitting area including a contact portion with a stopper 1, wherein the fitting area refractory layer 5A is made of a fitting area refractory, which is configured of a refractory different from a refractory constituting the nozzle body (a main body refractory 2A) and being other than the fitting area refractory, and a gas discharge port 8A is provided in at least a boundary portion 9 of the fitting area refractory layer 5A and the main body refractory 2A on the surface in contact with molten steel.
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
B22D 41/16 - Fermetures du type quenouilles de coulée, c.-à-d. la tige de fermeture étant mise en place vers le bas à travers le récipient et le métal qu'il contient, pour faire varier la section de passage du métal dans l'ouverture de coulée
The present invention provides a plate holding device, a plate removing device, a plate mounting device, and a plate attaching/detaching device with which it is possible to reliably attach and detach a plate to a plate-housing metal frame. According to an aspect of the present invention, a plate holding device 101 is attached to a tip-end of a robot arm 15, the plate holding device 101 comprising: a plurality of holding portions 4 for holding a plate for a sliding nozzle device; an expanding/contracting means for expanding and contracting intervals between the plurality of holding portions 4; a pushing portion 9 for pushing a center portion of the plate when the plate is held by the plurality of holding portions 4; and a force sensor 10 for detecting a force the holding portions 4 and/or the pushing portion 9 receives from the plate.
The present invention provides a compact plate tilting machine capable of suppressing a fall or deviation of mortar applied to a plate. A plate tilting machine 1 for tilting a plate for a sliding nozzle device is provided with a mount 3 and a plate holder 4 rotatably attached to the mount 3. The plate holder 4 includes: a holding surface that a non-sliding surface of a plate abuts or opposes; an attach/detach mechanism for detachably holding the plate so that the non-sliding surface of the plate abuts or opposes the holding surface; and a space portion in which a mortar applied surface of the non-sliding surface of the plate is exposed. The plate tilting machine 1 is further provided with a rotation stop mechanism for stopping rotation of the plate holder 4.
A socket installation structure of a refractory article is designed to prevent gas leakage therein. A first flange is provided between an outward end and an inward end of a socket, and a face of the first flange on the side of an inward end thereof is bonded to an article body of the refractory article through a sealing material. Further, a face of the first flange on the side of an outward end thereof faces a metal plate disposed around the outward end or a second flange provided on the side of the outward end, through a low thermally-conductive material layer made of a low thermally-conductive material having a thermal conductivity at room temperature of 40 (W/(m·K)) or less.
The purpose of the present invention is to provide a method for manufacturing, with high precision, a gas discharge through hole in a stopper or the like. In the present invention, a substance 14 eliminated by heat treatment is mounted to a side surface of a columnar primary molded article 11, a core 15 is fabricated, and the core 15 is arranged in a molding form for molding a stopper or the like, the periphery of the core 15 is filled with a green body for molding the stopper or the like, and secondary molding is performed, whereby an integral molded article including the core 15 is fabricated, and the integral molded article is heat treated. After heat treatment, the portion where the substance 14 eliminated by heat treatment was mounted becomes the gas discharge through hole.
The objective of the present invention is to stabilize a discharge flow of molten steel and stabilize the melt surface inside a mold, that is, to reduce fluctuation thereof, in a flat immersion nozzle. In the present invention, lateral protrusion parts 1 protruding in the thickness direction are provided in the wall surface in the width direction of a flat portion in an immersion nozzle, which has a flat shape in which the width Wn of an inner hole is greater than the thickness Tn of the inner hole. These lateral protrusion parts 1 are arranged so as to form a pair slanting in the width direction and downward, at axisymmetric positions with respect to center axis in the vertical direction of the wall surface in the width direction, and the lateral protrusion parts 1 are arranged facing each other in both wall surfaces in the width direction.
The objective of the present invention is to stabilize a discharge flow of molten steel and stabilize the melt surface inside a mold, that is, to reduce fluctuation thereof, in a flat immersion nozzle. In the present invention, lateral protrusion parts 1 protruding in the thickness direction are provided in the wall surface in the width direction of a flat portion in an immersion nozzle, which has a flat shape in which the width Wn of an inner hole is greater than the thickness Tn of the inner hole. These lateral protrusion parts 1 are arranged so as to form a pair slanting in the width direction and downward, at axisymmetric positions with respect to center axis in the vertical direction of the wall surface in the width direction, and the lateral protrusion parts 1 are arranged facing each other in both wall surfaces in the width direction.
The purpose of the present invention is to increase the precision with which the back pressure in the vicinity of a gas discharge section in a continuous casting stopper is ascertained and managed. A continuous casting stopper comprising a vertically-oriented cavity 2 for conveying gas in the center portion thereof is provided with one or a plurality of gas discharge holes 4 penetrating from the cavity 2 to the exterior through a tip center portion or a side surface of a reduced-diameter area, which includes a fitting portion 3 fitting to a nozzle 20 thereunder, and is further provided with a pressure control component 5 located in the portion of the cavity 2 above the gas discharge holes 4.
A flat immersion nozzle stabilizes the discharging flow of molten steel thereby stabilizing the molten steel surface in a mold, namely, decreasing the fluctuation thereof. In the immersion nozzle having a flat shape in which a width Wn of an inner hole is greater than a thickness Tn of the inner hole, a central protrusion portion (1) is disposed in a center section of a wall surface in a width direction of a flat section. Wp/Wn, a ratio of a length Wp of the central protrusion portion in the width direction to Wn, is 0.2 or more and 0.7 or less. The central protrusion portion (1) is disposed symmetrically as a pair; and a total length Tp in the thickness direction of the pair of the central protrusion portions is 0.15 or more and 0.75 or less of Tn.
B22D 41/08 - Récipients de maintien d'un bain de fusion, p. ex. poches, paniers de coulée, bassins de coulée ou systèmes analogues pour coulée par le fond
B22D 11/06 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules dont les parois se déplacent, p. ex. entre des rouleaux, des plaques, des courroies, des chenilles
B22D 11/103 - Répartition du métal liquide, p. ex. en utilisant des goulottes, des flotteurs, des distributeurs
The purpose of the present invention is to provide a quick setting agent which is capable of suppressing decrease in adhesive properties during wet spray of a refractory, while being also capable of suppressing nozzle clogging and generation of dust, and which does not contain an alkali aluminate salt. The present invention provides a quick setting agent which contains an additive and a refractory material, and which is configured such that: the additive contains calcium hydroxide, at least one curing accelerator that is selected from among alumina cement and a silicate, and at least one specific powder material that is selected from among a sulfate, a carbonate, citric acid, a citrate, boric acid and a borate; the ratio of the content of the calcium hydroxide to the content of the curing accelerator, namely (content of calcium hydroxide)/(content of curing accelerator) is from 0.7 to 4 (inclusive); and the ratio of the total content of the calcium hydroxide and the curing accelerator to the content of the specific powder material, namely (total content of calcium hydroxide and curing accelerator)/(content of specific powder material) is from 1 to 10 (inclusive).
The purpose of the present invention is to improve the filling property of a hot filling material. The present invention provides a hot filling material comprising a binder and water both added to 100% by mass of a refractory raw material, wherein a basic raw material having a particle diameter of 1 mm or more and a basic raw material having a particle diameter of 20 μm or more and less than 106 μm are contained in amounts of 25 to 60% by mass inclusive and 5 to 25% by mass inclusive, respectively, relative to 100% by mass of the refractory raw material, and the content of a basic raw material having a particle diameter of less than 20 μm is 30% by mass or less (including 0) relative to 100% by mass of the refractory raw material.
The present invention addresses the problem of improving corrosion resistance in a hot dry spraying material and a method for hot dry spraying work. The present invention is a method for hot dry spraying work, in which a blend material comprising a refractory material and a binder is pressure-fed through a pipe toward a spray nozzle, water is added to the blend material at a tip end of the spray nozzle, and the resultant mixture is hot-sprayed at the tip end, the method being characterized in that the blend material contains magnesium lime rock having a grain size of 0.075 mm or larger and less than 1 mm in an amount of 10 to 50% by mass inclusive in 100% by mass, i.e., the total mass, of the refractory material and the binder, and the content of magnesium lime rock having a grain size of less than 0.075 mm is 35% by mass or less (including 0% by mass) in 100% by mass, i.e., the total mass, of the refractory material and the binder.
C04B 35/66 - Réfractaires monolithiques ou mortiers réfractaires, y compris ceux contenant de l'argile
C04B 35/043 - Réfractaires obtenus à partir de mélanges à granulométrie contrôlée
C04B 35/06 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes à base d'oxyde de magnésium, d'oxyde de calcium ou de mélanges d'oxydes dérivés de la dolomite à base de mélanges d'oxydes dérivés de la dolomite
C04B 35/63 - Préparation ou traitement des poudres individuellement ou par fournées utilisant des additifs spécialement adaptés à la formation des produits
The objective of the present invention is to retain the hot sealing properties of a shaped joint material while suppressing igniting or smoke generation from the combustible material in the shaped joint material. The shaped joint material is obtained by adding a ratio of 26-50% by mass of an organic material additive into 100% by mass of a mixture including 50-90% by mass of a gibbsite aluminum hydroxide raw material, 1-9% by mass of clay, 9-23% by mass of graphite, and the balance mostly other refractory raw material, and kneading, shaping, and drying the result.
Disclosed is a casting nozzle intended to suppress or prevent breaking of a nozzle body thereof. The casting nozzle comprises: a nozzle body; a metal casing disposed to surround an upper end of the nozzle body to form a gas pool between an outer peripheral surface of the upper end of the nozzle body and an inner peripheral surface of the metal casing; and a bridging segment provided in at least a part of the gas pool to bridge between the outer peripheral surface of the upper end of the nozzle body and the inner peripheral surface of the metal casing.
The objective of the present invention is to retain the hot sealing properties of a shaped joint material while suppressing igniting or smoke generation from the combustible material in the shaped joint material. The shaped joint material is obtained by adding a ratio of 26-50% by mass of an organic material additive into 100% by mass of a mixture including 50-90% by mass of a gibbsite aluminum hydroxide raw material, 1-9% by mass of clay, 9-23% by mass of graphite, and the balance mostly other refractory raw material, and kneading, shaping, and drying the result.
A plate, a plate-holding apparatus, and a holding method for the plate for facilitating work to attach the plate to a plate-receiving metal frame of a sliding nozzle device. A gap is ensured between a to-be-held portion of the plate and an inner wall surface of an engagement groove such that, when the plate is held by engaging the to-be-held portion of the plate with the engagement groove of a holding portion of the plate-holding apparatus, the plate is movable in the longitudinal direction, the width direction, and the thickness direction of the plate.
In a sliding nozzle comprising three plates consisting of an upper plate, an intermediate plate capable of a sliding movement, and a lower plate, it is intended to suppress adhesion and deposition of metal oxides and others on wall surfaces of inner bores of the three plates. The intermediate plate has: a first inclined portion whose surface defines a slidingly closing directional leading-side wall surface of an inner bore thereof and extends obliquely downwardly in a diametrically contracting direction; a second inclined portion whose surface defines an upper part of a slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically contracting direction, and a third inclined portion whose surface defines a lower part of the slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically expanding direction.
B22D 41/24 - Fermetures du type à tiroir, c.-à-d. comportant une plaque fixe et une plaque mobile en contact mutuel et dont le glissement permet de faire varier la section de passage caractérisées par une plaque se déplaçant de façon rectiligne
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
B22D 41/42 - Caractéristiques relatives à l'injection de gaz
86.
MONOLITHIC REFRACTORY SPRAY APPLICATION METHOD, AND SPRAY MATERIAL USED THEREIN
Provided is a method for the spray application of a monolithic refractory in which application water is injected from a water injector 7, which is provided to a material-conveying tube 5 which extends from a material-supplying unit 1 to a distal-end spray nozzle 4, into a spray material conveyed inside the material-conveying tube, wherein, in order to improve the stability of said spray application, either: the ratio (flow rate of application water conveyance gas/flow rate of spray material conveyance gas) of the flow rate (Nm3/min) of an application water conveyance gas for conveying the application water introduced by the water injector 7, to the flow rate (Nm3/min) of a spray material conveyance gas for conveying the spray material, is 0.07 to 2, inclusive, and, the spray material has a degree of compression of 32% or less; or, the ratio (flow rate of application water conveyance gas/application water volume) of the flow rate (Nm3/min) of application water conveyance gas for conveying the application water introduced by the water injector 7, to the amount of the application water (m3/min), is 100 to 1000, inclusive.
Provided is a sealing block installation structure capable of preventing the occurrence of a gap between a nozzle or plug installed in a bottom portion of a molten metal vessel and a plate or the like located on the lower side of the nozzle or plug, and a gap between the nozzle or plug and a sealing block located on the upper side of or on the outer peripheral side of the nozzle or plug. In the seating block installation structure, a seating block (2) disposed to surround a nozzle for discharging therethrough molten metal downwardly from the bottom portion of the molten metal vessel or a plug is fixed to a shell of the bottom portion of the molten metal vessel by a connecting member (3).
The present invention provides a tuyere setting structure in which no gap is generated between a nozzle or plug set at the bottom of a molten metal container and a plate or the like located below the nozzle or plug, and between the nozzle or plug and a tuyere located above or on the outer peripheral side of the nozzle or plug. In the tuyere setting structure according to the present invention, a tuyere 2 which is set so as to surround a plug or a nozzle 1 for discharging molten metal downwardly from the bottom of the molten metal container, is fixed, with studs 3, to an iron shell 4 at the bottom of the molten metal container.
The present invention provides a tuyere setting structure in which no gap is generated between a nozzle or plug set at the bottom of a molten metal container and a plate or the like located below the nozzle or plug, and between the nozzle or plug and a tuyere located above or on the outer peripheral side of the nozzle or plug. In the tuyere setting structure according to the present invention, a tuyere 2 which is set so as to surround a plug or a nozzle for discharging molten metal downwardly from the bottom of the molten metal container, is fixed, with joining components 3, to an iron shell 4 at the bottom of the molten metal container.
The present invention provides a sliding nozzle device having sliding metal frame holding parts provided on both of the long sides of a fixed metal frame so as to be openable and closeable, wherein the sliding metal frame holding parts on both sides can be simultaneously opened/closed with a simple operation. In this sliding nozzle device, shafts 5a, 5b of the sliding metal frame holding parts 4a, 4b are rotatably held, respectively, on both of the long sides of a fixed metal frame 2, end sections of the shafts of the sliding metal frame holding parts on both sides are respectively provided with a first link part 7a and a second link part 7b, wherein the first link part and the second link part are connected with a linking means 10 so that opening/closing one of the sliding metal frame holding parts causes the shaft of the other sliding metal frame holding part to rotate in reverse, thereby also opening/closing the other sliding metal frame holding part.
Provided are a magnesia carbon brick which does not include graphite yet has excellent spalling and corrosion resistances, and a method for producing thereof. The brick is obtained by adding an organic binder to a refractory raw material mixture followed by kneading, molding, and heat-treating, wherein the mixture includes total 0.1 to 2.0 mass % of pitch and/or carbon black, total 0.1 to 1.0 mass % of aluminum and/or aluminum alloy, 3.0 to 10.0 mass % of magnesia having particle diameter of less than 0.075 mm, and 87.0 to 96.0 mass % of magnesia having particle diameter of 0.075 to 5 mm; and a mass ratio of magnesia having particle diameter of 1 to 5 mm to that of 0.075 to 1 mm is 1.66 to 2.34; graphite is not included therein; and an apparent porosity thereof after heat-treatment under reductive atmosphere at 1400° C. for 3 hours is 8.0% or less.
C04B 35/043 - Réfractaires obtenus à partir de mélanges à granulométrie contrôlée
C04B 35/01 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes
The purpose of the present invention is to enhance instantaneous adhesion at spraying of a spray material for hot repair to a surface to be repaired. This spray material for hot repair contains 65% by mass to 95% by mass of a magnesia-based raw material and 0.5% by mass to 10% by mass of a phenol resin, the content of magnesia-based raw material having a particle diameter of less than 20 µm being 5% by mass to 30% by mass, the content of phenol resin having a particle diameter of less than 20 µm being 0.3% by mass to 9% by mass, and the ratio of "the content of magnesia-based raw material having a particle diameter of less than 20 µm/the content of phenol resin having a particle diameter of less than 20 µm" being 0.6 to 30.
In order to improve the efficiency of work involved in lining bricks without increasing the manufacturing cost of the bricks being used in a lining method for bricks used to construct a side wall of a kiln, multiple stages of bricks are stacked on the inner side portion of a kiln having regions which have a substantially cylindrical shape and for which the kiln radius differs, thereby constructing the side wall of the kiln. In this brick lining method, in stages for which the kiln radius differs only bricks which have the same taper angle and height are used, except for adjustment bricks, and in at least a portion of each stage bricks which have the same taper angle, height, and length but have differing back-surface widths are used.
In order to improve the efficiency of work involved in lining bricks without increasing the manufacturing cost of the bricks being used in a lining method for bricks used to construct a side wall of a kiln, multiple stages of bricks are stacked on the inner side portion of a kiln having regions which have a substantially cylindrical shape and for which the kiln radius differs, thereby constructing the side wall of the kiln. In this brick lining method, in stages for which the kiln radius differs only bricks which have the same taper angle and height are used, except for adjustment bricks, and in at least a portion of each stage bricks which have the same taper angle, height, and length but have differing back-surface widths are used.
The purpose of the present invention is to improve adhesion, adhesiveness, and corrosion resistance in a hot dry spraying material and a method for hot dry spraying work. To this end, the present invention is a method for hot dry spraying work in which a formulation comprising a refractory material and a binder is pressure-fed through a tubing toward a spray nozzle, water is added at a distal end section of the spray nozzle, and same is hot-sprayed on, wherein the method is characterized in that the formulation comprises 10 to 50 mass% magnesium limestone having a grain size of 1 mm or larger out of 100 mass% of the total amount of the refractory material and the binder, and the amount of water added is 10 to 50 mass% in terms of outer percentage relative to the 100 mass% of the total amount of the refractory material and the binder.
C04B 35/03 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base d'oxydes à base d'oxyde de magnésium, d'oxyde de calcium ou de mélanges d'oxydes dérivés de la dolomite
C04B 35/66 - Réfractaires monolithiques ou mortiers réfractaires, y compris ceux contenant de l'argile
(1) Continuous casting machines and parts and fittings therefor; industrial robots for moving heavy machinery; robotic arms for refractory maintenance.
The purpose of the present invention is to prevent a gas leak in a gas introduction hole socket section. In the present invention, a flange 3 is provided between an outer end section and an inner end section of a socket 20 and the surface on the inner end section side of the flange 3 is configured to adhere to a refractory body 30 via a sealing material 2. Furthermore, the surface on the outer end section side of the flange 3 is configured to face a metal plate 6 around the outer end section of the refractory body or another flange disposed on the outer end section side of the refractory body via a low thermal conductive material layer 4 formed of a low thermal conductive material having a thermal conductivity of 40 (W/(m∙K)) or less at room temperature.
The purpose of the present invention is to improve the thermal shock resistance of a monolithic refractory containing magnesia. Provided is a monolithic refractory which comprises, relative to 100 mass% of a refractory material, 15-50 mass% inclusive of a magnesia material having a particle diameter of 1 mm or more, 2-15 mass% inclusive of a fine alumina powder having a particle diameter of 1-10 μm inclusive, and 1-8 mass% inclusive of an ultrafine silica powder having a particle diameter of less than 1 μm, wherein, when the content of the magnesia material having a particle diameter of 1 mm or more is referred to as A mass%, the content of a magnesia material having a particle diameter less than 1 mm is A/10 mass% or less (including 0) relative to 100 mass% of the refractory material.
The purpose of the present invention is to ensure stable thermal insulation properties in a monolithic refractory comprising a silicon carbide raw material. Relative to 100 mass% of a refractory raw material, this monolithic refractory comprises: 20 to 50 mass% of a silicon carbide raw material having a particle size of 1 mm or greater; 2 to 15 mass% of fine alumina powder having a particle size of 1 to 10 μm; and 1 to 8 mass% of superfine silica powder having a particle size of less than 1 μm. Relative to 100 mass% of the refractory raw material, the content of alumina cement is 15 mass% or less (including 0) and the content of the silicon carbide raw material having a particle size of less than 1 mm is 5 mass% or less (including 0).
In the method for replacing an immersion nozzle while pushing out a used immersion nozzle by a new immersion nozzle, in order to minimize leakage of molten steel during the replacement, to enable the use of a shaped joint sealer in a joint interface, and to ensure high sealability, a concave portion is formed on the new immersion nozzle's upper plane so as to include a nozzle hole, and the shaped joint sealer is mounted in this concave portion. The immersion nozzle's upper plane is caused to slide while being pressed to the upper nozzle's lower plane.
B22D 41/08 - Récipients de maintien d'un bain de fusion, p. ex. poches, paniers de coulée, bassins de coulée ou systèmes analogues pour coulée par le fond
B22D 41/56 - Moyens de support, de manipulation ou de changement des buses de coulée
B22D 11/10 - Alimentation en métal liquide ou traitement du métal liquide
