The present invention suppresses damage of a joint part between a body member and a guide member, and suppresses any reduction in floating transportation performance, in a floating transportation device in which a porous material is applied to the guide member. A floating transportation device according to the present invention comprises a body member 1 composed of a dense material and a guide member 2 composed of a porous material. The body member 1 has a first screw section 11 on the outer surface thereof, and has a fluid introduction section 12, via which a fluid for floating transportation is introduced, in the interior thereof. The guide member 2 has a second screw section 21 on the inner surface thereof, and has a floating transport surface 22, on which a web transportation object W is allowed to float, on the outer surface thereof. The body member 1 and the guide member 2 are joined by a screw joint part 4 formed from the first screw section 11 and the second screw section 21.
The continuous casting nozzle includes a nozzle body made of a refractory material and having, in a vertical direction, an inner bore through which molten steel passes. The nozzle body includes a flange portion at an upper end thereof, the flange portion having: an outer surface including a tapered part inclining downwardly towards the inner bore; and a lower surface including a horizontal part extending horizontally from a lower edge of the tapered part towards the inner bore. The continuous casting nozzle also includes a metal case covering the outer periphery of the flange portion, the metal case including a horizontal plate portion which faces the horizontal part of the flange portion through mortar having a constant thickness. The continuous casting nozzle is configured to receive a pressing force from thereoutside and therebelow by the horizontal plate portion.
B22D 11/06 - Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
The present invention provides a casting material capable of reducing a workload in construction and dispensing with a drying process. The casting material according to the present invention is obtained by adding aluminum lactate at an addition rate of 0.1-1.2 mass% and one or more calcium aluminates selected from CA, CA2, and C12A7 at an addition rate of 0.05-1 mass% in total to 100 mass% of a flame-resistant raw material mixture containing 0.2-12 mass% of silica fume and 0.1-2 mass% of reactive alumina, with the balance being other flame-resistant raw materials, wherein the reactive alumina is a flame-resistant raw material that causes a rehydration reaction and is cured when water is added thereto.
The present invention provides a magnesia-carbon brick having excellent spalling resistance even though it contains graphite at a low rate, and having excellent corrosion resistance. In the present invention, the magnesia-carbon brick production method comprises: adding, as a binder, 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, to a refractory raw material blend containing magnesia at a rate of 85% by mass or more, and containing graphite at a rate of 12% by mass or less (including 0); and subjecting the resulting mixture to kneading under a warm condition and then to molding under a warm condition, wherein the particle size composition of the magnesia in the refractory raw material blend is set such that the mass ratio of magnesia having a particle size of 1 mm or more to magnesia having a particle size of 0.075 mm to less than 1 mm is 0.2 to 1.5, and the mass ratio of the magnesia having a particle size of 1 mm or more to magnesia having a particle size of less than 0.075 mm is 3.0 or more.
A wet spray material for a firing furnace, which is capable of shortening a time until the firing furnace becomes ready for operation after spraying onto a construction target surface of the firing furnace, and a construction method using the wet spray material. Specifically, a refractory raw material comprising 55% by mass to 90% by mass of particles having a particle size of less than 1 mm is kneaded with silica sol and water added thereto, and the resulting kneaded material is pressure-fed to a nozzle, and, after adding thereto a slurry or aqueous solution of at least one or more selected from the group consisting of 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, in or just before the nozzle, sprayed onto a construction target surface.
The present invention provides a dry coating material for a tundish, the dry coating material being capable of improving the strength of a constructed body and reducing a problem of odor generation. That is, the present invention provides a dry coating material for a tundish, the dry coating material containing a total of 3-15 mass% of a first binder that is one or more kinds selected from inorganic hydrate powders having a thermal decomposition initiation temperature of 40-300°C, and a total of 0.1-10 mass% of a second binder that is one or more kinds selected from powdered alkali silicates other than hydrates, powdered alkali sulfates other than hydrates, and powdered alkali phosphates other than hydrates, the content of a phenolic resin being 0.5 mass% or less (including 0), and the remainder being mainly a refractory raw material.
Provided is a lower nozzle attaching-detaching apparatus capable of reliably performing attaching and detaching of a lower nozzle. The lower nozzle attaching-detaching apparatus A is designed to attach and detach a lower nozzle 72 made of a refractory material with respect to a lower plate made of a refractory material and installed in a sliding nozzle device 7, wherein it comprises: a holder 1 capable of being attached and detached with respect to a holding metal frame that holds the lower nozzle 72; a robot arm 2 having the holder 1 at a tip thereof; a force sensor 3 to detect a reaction force in a front/rear direction and a reaction force in a rotational direction, the two reaction forces being received by the holder 1 from the holding metal frame along with the movement of the robot arm 2; and a control unit 21 to monitor and control the movement of the robot arm 2. The control unit 21 operates to perform the attaching and detaching of the lower nozzle 72 by controlling the movement of the robot arm 2 while monitoring the two reaction forces detected by the force sensor 3, and two movement amounts in the front/rear direction and in the rotational direction of the robot arm 2.
The present invention provides a silicon nitride composite material and a probe-guiding part, which stably have a coefficient of thermal expansion equivalent to a silicon wafer, and high strength. The silicon nitride composite material of the present invention contains: Si3N4 in an amount of 35% by mass to 70% by mass; ZrO2 in an amount of 25% by mass to 60% by mass; and one or more selected from the group consisting of MgO, SiO2, Al2O3, and Y2O3, in an amount of 0.5% by mass to less than 5% by mass, wherein a peak intensity ratio: Iβ/(Iα+Iβ), is 0.05 to 0.80, where Iα denotes the (210) plane peak intensity of αSi3N4, as measured by X-ray powder diffraction, and Iβ denotes the (210) plane peak intensity of βSi3N4, as measured by X-ray powder diffraction. The probe-guiding part of the present invention comprises a plate-shaped body using the above silicon nitride composite material, wherein the body has a plurality of through-holes and/or slits each for inserting the probe therethrough.
C04B 35/584 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides based on silicon nitride
ABSTRACT The present invention provides a magnesia-carbon brick having excellent spalling resistance even though it contains graphite at a low rate, and having excellent corrosion resistance. In the present invention, the magnesia-carbon brick production method comprises: adding, as a binder, 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, to a refractory raw material blend containing magnesia at a rate of 85% by mass or more, and containing graphite at a rate of 12% by mass or less (including 0); and subjecting the resulting mixture to kneading under a warm condition and then to molding under a warm condition, wherein the particle size composition of the magnesia in the refractory raw material blend is set such that the mass ratio of magnesia having a particle size of 1 mm or more to magnesia having a particle size of 0.075 mm to less than 1 mm is 0.2 to 1.5, and the mass ratio of the magnesia having a particle size of 1 mm or more to magnesia having a particle size of less than 0.075 mm is 3.0 or more.
The present invention provides a continuous casting nozzle capable of mitigating stress concentration on a neck portion thereof and suppressing downward displacement thereof. In the present invention, the continuous casting nozzle 1 comprises a nozzle body 2 made of a refractory material and having, in a vertical direction, an inner bore 21 through which molten steel passes, wherein the nozzle body 2 includes a flange portion 22 at an upper end thereof, the flange portion 22 having: an outer surface including a tapered part 221 inclining downwardly towards the inner bore 21; and a lower surface including a horizontal part 222 extending horizontally from a lower edge of the tapered part 221 towards the inner bore 21. The continuous casting nozzle 1 further comprises a metal case 3 covering the outer periphery of the flange portion 22, the metal case 3 including a horizontal plate portion 31 which faces the horizontal part 222 of the flange portion 22 through mortar 4 having a constant thickness, wherein the continuous casting nozzle 1 is configured to receive a pressing force from thereoutside and therebelow by the horizontal plate portion 31.
The present invention provides a submerged nozzle replacement apparatus capable of quickly and easily moving a blank plate to a standby position. The submerged nozzle replacement apparatus 1 of the present invention comprises: a pressing section to press a lower surface of a flange portion of a submerged nozzle 200; an introducing section 4 to, when attaching the submerged nozzle 200, guide said submerged nozzle to the pressing section; an ejecting section 5 to, when detaching the submerged nozzle 200 from the pressing section, guide said submerged nozzle to a detaching position; and a holding section 6 that holds a blank plate 300. The holding section 6 is movable between a first position where the blank plate 300 is opposed to the submerged nozzle 200 in a state of being supported by the pressing section, and a second position where the lower surface of the flange portion of the submerged nozzle can be supported by the holding section 6 and the introducing section 4.
The present invention provides a resin-based mud material in which clogging is unlikely to occur when being filled into a taphole of a blast furnace. This mud material is for filling a taphole of a blast furnace, and is obtained by kneading a novolak-type phenolic resin, a solvent, and a refractory raw material formulation, wherein: the novolak-type phenolic resin has a weight-average molecular weight of 300-1500; the addition rate of a curing agent for promoting curing of the novolak-type phenolic resin is 0.08 mass% or less (including 0) with respect to the novolak-type phenolic resin which is 100 mass%; and the refractory raw material formulation comprises carbon black at 2-20 mass%.
The present invention provides a method for manufacturing a continuous casting stopper capable of uniformly discharging gas from a fitting portion with a nozzle or from the vicinity of the fitting portion. The present invention is a method for manufacturing a continuous casting stopper 1 that has a gas pool in a center portion in the vertical direction and a plurality of through-holes for gas discharge penetrating from the gas pool to an outer surface of a fitting portion with a nozzle underneath or of the vicinity of the fitting portion, the through-holes being formed of a thread-like disappearing body 3 composed of a material that disappears through heat treatment, the method being characterized in that the thread-like disappearing body 3 includes a large cross section portion 31 positioned on the gas pool side, and a small cross section portion 32 positioned on the outer surface side and having a cross sectional area smaller than that of the large cross section portion 31, wherein the length of the large cross section portion 31 is longer than the length of the small cross section portion 32.
The present invention provides a siliceous castable refractory which has high strength after curing and after drying, and which is excellent in terms of volume stability at high temperatures. A siliceous castable refractory according to the present invention contains 1-15 mass% of silica flour, 0.1-5 mass% of magnesia that has an average particle diameter of 100 μm or less, and 0.1-5 mass% of borosilicate glass that has an average particle diameter of 500 μm or less, with the balance being mainly made up of a siliceous starting material that does not contain silica flour.
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.
The present invention improves corrosion resistance and thermal shock resistance of a zirconiacarbon based refractory product and refractory member for continuous casting. The refractory product according to the present invention contains a free carbon component in an amount of 8% by mass to 16% by mass, and a remainder in which a main component is a zirconia component, wherein a content of other component than the free carbon component and the zirconia component is less than 5% by mass in total. When a remainder after excluding a composition comprised of the free carbon component from a composition of the refractory product is defined as 100% by volume, refractory particles having a particle size of greater than 0.3 mm account for 5% by volume or more, and refractory particles having a particle size of 0.045 mm or less account for 5% by volume to 40% by volume, and an approximately continuous void layer is present around each of a plurality of coarse particles, at least one of which has a largest particle size among refractory particles in the refractory product. The refractory product has an apparent porosity of 16% or less, and a maximum thermal expansion rate at a temperature up to 1500°C is 0.6% or less.
The present invention provides a submerged nozzle replacement apparatus capable of quickly and easily moving a blank plate to a standby position. The submerged nozzle replacement apparatus 1 of the present invention comprises: a pressing section to press a lower surface of a flange portion of a submerged nozzle 200; an introducing section 4 to, when attaching the submerged nozzle 200, guide said submerged nozzle to the pressing section; an ejecting section 5 to, when detaching the submerged nozzle 200 from the pressing section, guide said submerged nozzle to a detaching position; and a holding section 6 that holds a blank plate 300. The holding section 6 is movable between a first position where the blank plate 300 is opposed to the submerged nozzle 200 in a state of being supported by the pressing section, and a second position where the lower surface of the flange portion of the submerged nozzle can be supported by the holding section 6 and the introducing section 4.
The present invention provides a thermal insulation material that is excellent in thermal insulation performance under high temperature, and has high strength and hardness. The thermal insulation material according to the present invention is obtained by molding a mixture containing 62 to 86 mass % of fumed silica and 10 to 30 mass % of an infrared-opaque material. The thermal insulation material has a mode diameter of 20 nm or less in a pore distribution range of 70 nm or less, a total number of pores of 3.5 × 1016/g or more, and, at 800°C, a thermal conductivity of 0.06 W/(m·K) or less, a compressive strength of 0.4 MPa or more, and a hardness of 75 or more.
The present invention provides: a refractory which is capable of suppressing the occurrence of a large crack during use; and a method for producing the same. A refractory according to the present invention randomly contains, in a refractory tissue that is mainly composed of a refractory starting material, at least one of a burnable and eliminable sheet and a space that is formed by burning and eliminating the sheet. The refractory is obtained by a method for producing a refractory, the method including a step for adding and mixing a burnable and eliminable sheet to a refractory starting material formulation that is mainly composed of a refractory starting material. With respect to the burnable and eliminable sheet, if A is the representative length, B is the maximum length in the plane of the sheet in a direction that is orthogonal to the definition direction of the representative length A, and C is the thickness, C ≤ 1 mm, C/A ≤ 0.1, and 0.2 ≤ B/A ≤ 1.0 are satisfied.
A refractory product contains a free carbon component of 10-30% by mass, and the remainder in which: a main mineral phase includes one or more of corundum, spinel, and periclase, with periclase content less than 40% by mass; and total content of a silica component and a silicon carbide component less than 15% by mass. When the remainder is defined as 100% by volume, refractory particles having particle size of: greater than 0.3 mm account for 20% by volume or more, and 0.045 mm or less account for 3-30% by volume, with a substantially continuous void layer present around each of a plurality of coarse particles at least one of which has the largest particle size among refractory particles in the refractory product. The refractory product has an apparent porosity of 16% or less, and a maximum thermal expansion rate at a temperature up to 1500° C. is 0.6% or less.
The present invention improves corrosion resistance and thermal shock resistance of a zirconia-carbon based refractory product and refractory member for continuous casting. The refractory product according to the present invention contains a free carbon component in an amount of 8% by mass to 16% by mass, and a remainder in which a main component is a zirconia component, wherein a content of other component than the free carbon component and the zirconia component is less than 5% by mass in total. When a remainder after excluding a composition comprised of the free carbon component from a composition of the refractory product is defined as 100% by volume, refractory particles having a particle size of greater than 0.3 mm account for 5% by volume or more, and refractory particles having a particle size of 0.045 mm or less account for 5% by volume to 40% by volume, and an approximately continuous void layer is present around each of a plurality of coarse particles, at least one of which has a largest particle size among refractory particles in the refractory product. The refractory product has an apparent porosity of 16% or less, and a maximum thermal expansion rate at a temperature up to 1500° C. is 0.6% or less.
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 comprises a fixed metal frame and a sliding metal frame which is slidably provided with respect to the fixed metal frame. The sliding metal frame is movable between a first position where, in a state where two refractory plates are mounted, respectively, in a plate-receiving recess of the fixed metal frame 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 plate-receiving recess, a surface pressure can be loaded between the fixed metal frame and the sliding metal frame.
B22D 41/24 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
B22D 41/34 - Supporting, fixing or centering means therefor
B22D 41/40 - Means for pressing the plates together
The present invention provides an inspection unit for a web-conveyed object, in which the web length of an inspection zone is reduced. In this inspection unit for a web-conveyed object, an interval L between a front-side floating conveyance device 1 and a rear-side floating conveyance device 2 arranged before and after an inspection device B is equal to or less than the total length (R1 + R2) of the radius R1 of the front-side floating conveyance device 1 and the radius R2 of the rear-side floating conveyance device 2.
G01N 21/89 - Investigating the presence of flaws, defects or contamination in moving material, e.g. paper, textiles
G01N 21/892 - Investigating the presence of flaws, defects or contamination in moving material, e.g. paper, textiles characterised by the flaw, defect or object feature examined
The present invention provides a dry spraying material for a firing furnace, which is free from a need for a drying process after spraying, and capable of withstanding physical shock from furnace contents. The dry spraying material according to the present invention is designed for a firing furnace having a furnace wall temperature of 1400° C. or less, wherein a SiO2 component derived from raw materials having a particle size of less than 75 μm and an Al2O3 component derived from raw materials having a particle size of less than 75 μm are contained in the dry spraying material, respectively, in the dry spraying material in an amount of 1% by mass to 10% by mass and in an amount of 5% by mass to 40% by mass. Further, a basic compound fine powder of one or more types selected from the group consisting of magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium nitrate, calcium oxide, calcium carbonate, calcium sulfate, and calcium nitrate each having a particle size of less than 75 μm is contained in a raw material mixture in a total amount of 0.1% by mass to 5% by mass. One or more types selected from alkali silicate and alkali phosphate are used as a binder, and the amount of usage of cement is limited to 5% by mass or less.
C04B 35/19 - Alkali metal aluminosilicates, e.g. spodumene
C04B 35/565 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on silicon carbide
C04B 35/63 - Preparing or treating the powders individually or as batches using additives specially adapted for forming the products
26.
SILICON NITRIDE-BASED SINTERED BODY AND METHOD FOR PRODUCING SAME
Disclosed is a technology for imparting a color tone difference to a silicon nitride-based sintered body. A silicon nitride-based sintered body according to the present disclosure is characterized by having a plurality of crystal grains and a grain boundary phase that bonds the crystal grains to each other, and by having a lightness difference of 5 or more in terms of the L* value. The silicon nitride-based sintered body according to the present disclosure is obtained, for example, by kneading a silicon nitride powder and a powder of an auxiliary starting material so as to obtain a granulated body, and subsequently molding the granulated body and firing the molded body under specific conditions.
Disclosed is a technique that increases the brightness of a surface of a silicon nitride-based sintered body. A silicon nitride-based sintered body according to the present disclosure has a plurality of crystal grains and a grain boundary phase that binds the crystal grains to each other, has an L* value of 55 or more in at least a portion of the surface, and has a thickness of 10 mm or more. The silicon nitride-based sintered body according to the present disclosure is obtained, for example, by kneading a silicon nitride powder and a powder of a sub-raw material to obtain a granulated body, and then molding and sintering the granulated body under a predetermined condition.
The present invention provides a method for manufacturing a non-fired brick whereby reductions in corrosion resistance and creep resistance due to the generation of low melting point substances can be suppressed, and sufficient strength can be exhibited. In the present invention, water is added to and mixed with a refractory raw material formulation containing 0.2-15 mass% of magnesia having a particle diameter of less than 75 μm and 0.3-10 mass% of silica having a particle diameter of less than 44 μm, with the remainder being mainly one or more of an alumina raw material, an alumina silica raw material, a silica raw material, and a spinel raw material, and the total content ratio of alkali metal phosphates and alkali metal silicates being less than 1 mass% (including 0). Thereafter, the mixture is press molded and then left standing at room temperature or heat treated at a temperature of 1000°C or less.
22 component at an addition rate of 0.5 mass% to 5 mass% to a refractory raw material mixture in which the CaO component content derived from alumina cement is 0.5 mass% or less (including zero).
Provided is a method for manufacturing an unfired basic brick using a binder that suppresses a decrease in strength at 400-1000°C without a decrease in corrosion resistance caused by the formation of a low melting point material and without the risk of the dissolution of binder components into molten steel or the deterioration of magnesia. In the present invention, water is added to a refractory raw material blend containing 0.2-30 mass% of magnesia having a particle size of less than 75 μm and 0.3-2.5 mass% of silica having a particle size of less than 75 μm, with the remainder comprising magnesia having a particle size of 75 μm or more and at least one of spinel, alumina, and titania, and the resultant mixture is kneaded, press-molded, and then heat treated at a temperature of 60-1000°C.
The present invention addresses the problem of suppressing structural spalling in an unburned magnesia-chrome brick. In the present invention, in order to solve this problem, a refractory raw material blend is kneaded, is then subjected to press molding, and is then heated to 60-1000°C, wherein the refractory raw material blend contains magnesia-chrome-based raw materials in a total amount of 73-98 mass% and alumina-based raw materials in a total amount of 1-25 mass% and further contains a binder.
The present invention is intended to make it possible for an immersion nozzle applicable to an immersion nozzle replacement apparatus to satisfy both the suppression of occurrence of cracks in a neck portion thereof and the suppression of occurrence of sinking thereof. In the immersion nozzle 10 according to the present invention, a bridging member 15 is provided to bridge an inner peripheral surface of a metal case 13A surrounding a flange portion 12 and an outer peripheral surface of a nozzle body 11. The bridging member 15 has one end fixed to the metal case 13A and the other end engaged with a recess 11c provided in the outer peripheral surface of the nozzle body 11. Further, in an area above an action point of an upward support force by a support device of the immersion nozzle replacement apparatus, the outer peripheral surface of the nozzle body 11 is formed to have a shape extending in a vertical direction without dimensional change with respect to a central axis of an inner bore 11a, except for the recess 11c.
A sliding nozzle apparatus includes a fixed metal frame, and a sliding metal frame which is provided openable-closable and slidable with respect to the fixed metal frame. When the sliding metal frame is opened, the sliding nozzle apparatus is erected such that a sliding direction of the sliding metal frame is oriented in a vertical direction. The fixed metal frame is provided with a fall prevention member, and the sliding metal frame is provided with an engagement member. The fall prevention member has a catching surface for catching the engagement member when the sliding metal frame is opened, in the uppermost position where the sliding metal frame 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 is oriented in the vertical direction.
B22D 41/24 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
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 is mounted on a lower portion of a molten steel outlet of a tundish. The immersion nozzle exchanging apparatus includes a support and a flap. The support has a support surface to support a lower surface of a plate of an upper nozzle inserted into the molten steel outlet. The flap is rotatable with respect to the support. The immersion nozzle exchanging apparatus further includes a rotation stopper for the flap. The rotation stopper includes a wedge to abut against the flap by projecting to an upper side of the flap, and a bolt connected to the wedge, and enables adjustment of a projection amount of the wedge by adjusting a fastening amount of the bolt.
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 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.
(1) Refractory sliding nozzle device for use with continuous, pressure, and die casting machines; nozzle changer for use with continuous, pressure, and die casting machines.
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.
Monolithic refractory being castable refractory mixes, not of metal; Monolithic refractory being gunning refractory mixes, not of metal; refractory bricks, not of metal
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 - Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
B05B 7/30 - Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid the first liquid or other fluent material being fed by gravity, or sucked into the carrying fluid
53.
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.
F16L 59/02 - Shape or form of insulating materials, with or without coverings integral with the insulating materials
F16L 9/18 - Double-walled pipesMulti-channel pipes or pipe assemblies
F16L 59/06 - Arrangements using an air layer or vacuum
F16L 59/12 - Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating materialArrangements specially adapted for supporting insulated bodies
F16L 59/14 - Arrangements for the insulation of pipes or pipe systems
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.
B22D 41/24 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
B22D 41/34 - Supporting, fixing or centering means therefor
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 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
B22D 41/34 - Supporting, fixing or centering means therefor
B22D 41/40 - Means for pressing the plates together
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 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
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 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides
H01L 21/683 - Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereofApparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components for supporting or gripping
C04B 41/00 - After-treatment of mortars, concrete, artificial stone or ceramicsTreatment of natural stone
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.
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.
C04B 35/057 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on calcium oxide
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.
B22D 41/22 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
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 - Pouring-nozzles with gas injecting means
B22D 41/16 - Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
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 of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
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 - Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereofApparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components for supporting or gripping
87.
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 the refractory 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.
Provided is a ZrOz-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 15, and wherein the CaO-ZrO2 composition includes a eutectic microstructure of CaO crystals and CaZrOs crystals, wherein a width of each of the CaO crystals observable in a cross-sectional microstructure is 50 pm or less.
B22D 41/54 - Manufacturing or repairing thereof characterised by the materials used therefor
C04B 35/057 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on calcium oxide
B22D 41/54 - Manufacturing or repairing thereof characterised by the materials used therefor
C04B 35/03 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
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 - Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
B22D 41/58 - Pouring-nozzles with gas injecting means
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 41/22 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
B22D 41/34 - Supporting, fixing or centering means therefor
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 41/22 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
B22D 41/34 - Supporting, fixing or centering means therefor
100.
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 - Monolithic refractories or refractory mortars, including those whether or not containing clay
B05B 7/24 - Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
B05D 1/02 - Processes for applying liquids or other fluent materials performed by spraying
C04B 35/622 - Forming processesProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
C04B 35/626 - Preparing or treating the powders individually or as batches
