Abrégé

An electric-hydraulic Brinell hardness testing head and a portable electric-hydraulic Brinell hardness tester. A controller, a battery pack and a motor are mounted on a hydraulic integrated block, an electric plunger pump is mounted in the hydraulic integrated block, and a check valve is mounted in a cartridge valve seat, which are advantageous in that by controlling the motor-driven miniature electric plunger pump with the controller to realize durable force applying, stability and accuracy of test force within retention time are realized, so that the test principle, the test force accuracy, an indication error, and a repeatability error of hardness measurement results comply with relevant domestic and foreign standards; and have the characteristics of simple measurement operations, quick measurement process, high efficiency, accurate test results, and high reliability, thereby ensuring the basic requirements for miniaturization, lightweight, and on-site use of portable hardness testers.

Classes IPC  ?

• G01N 3/42 - Recherche de la dureté ou de la dureté au rebondissement en effectuant des empreintes sous une charge permanente par des dispositifs de pénétration, p. ex. sphère, pyramide

Abrégé

The invention relates to a material hardness testing instrument, specifically to a portable digital display hardness tester, comprising a magnetic chuck, a support, a force measuring device, an indenter, an electronic circuit board, a digital display, and a force applying and indentation depth measuring device consisting of a hand wheel, a rotary encoder and a micrometric screw pair. The support is equipped with the rotary encoder. The micrometric nut is installed in a hole. The digital display is located in the front. The support is fixed on the magnetic chuck. The micrometric nut is internally provided with the micrometric screw. The rotating shaft of the rotary encoder is connected with the micrometric screw and rotates along with the micrometric screw. The upper end of the micrometric screw is connected with the hand wheel, while the lower end is connected with the force measuring device. The lower end of the force measuring device is connected with the indenter. The hand wheel, the micrometric screw, the force measuring device and the indenter are connected and coaxial, capable of moving axially along with the rotation of the hand wheel. The invention is simply structured, convenient in reading, easy to operate, high in accuracy, capable of being applied to the onsite, quick hardness testing of large parts, and capable of testing the Brinell hardness and Vickers hardness through depth measurement.

Classes IPC  ?

• G01N 3/42 - Recherche de la dureté ou de la dureté au rebondissement en effectuant des empreintes sous une charge permanente par des dispositifs de pénétration, p. ex. sphère, pyramide

Abrégé

A portable digital display hardness measuring device comprises a supporting seat (8), a force measuring device, a pressure head (1), an electronic circuit board (26), a digital display (19), and a stress application and indentation depth measuring device. The stress application and indentation depth measuring device comprises a hand wheel (11), a rotary encoder (9), a sleeve (14), and a micrometer screw thread pair formed by a micrometer nut (18) and a micrometer screw rod (17); the rotary encoder (9) is disposed on the supporting seat (8), the micrometer nut (18) is disposed in a hole, the digital displayer (19) is disposed on a front side, and the electronic circuit board (26) is disposed on a side face; the micrometer screw rod (17) is disposed in the micrometer nut (18), a rotating shaft (10) of the rotary encoder (9) is connected to the micrometer screw rod (17) and rotates with the micrometer screw rod (17), an upper end of the micrometer screw rod (17) is connected to the hand wheel (11), a lower end is connected to the force measuring device; and a lower end of the force measuring device is connected to the pressure head (1); and the hand wheel (11), the micrometer screw rod (17), the force measuring device, and the press head (1) are connected to each other and are concentric, and move with rotation of the hand wheel (11) in the axial direction. The portable digital display hardness measuring device has a simple structure, convenient reading, easy operation and high precision, and can be fixed on metal parts through a fixing device to quickly detect hardness of large parts on site.

Classes IPC  ?

• G01N 3/44 - Recherche de la dureté ou de la dureté au rebondissement en effectuant des empreintes sous une charge permanente par des dispositifs de pénétration, p. ex. sphère, pyramide les dispositifs de pénétration étant placés sous une faible charge initiale, puis sous une charge importante, c.-à-d. le procédé Rockwell
• G01N 3/02 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique Parties constitutives

Abrégé

A material hardness detection instrument and particularly an indentation depth measurement device for a portable digital display hardness tester comprises a hand wheel (3), a rotary encoder (5), a support base (6), and a micrometer thread pair formed by a micrometer nut (7) and a micrometer screw (8). The micrometer nut (7) is mounted in the support base (6). The micrometer screw (8) is inserted into the micrometer nut (7) and is in threaded connection to the micrometer nut (7). One end of the micrometer screw (8) is connected to the hand wheel (3) and the other end of the micrometer screw (8) is a free end. The rotary encoder (5) is mounted on the support base (6), a rotating shaft of the rotary encoder (5) and the micrometer screw (8) are driven to rotate with the rotation of the hand wheel (3), and the micrometer screw (8) moves up and down along an axial direction through the rotation of the hand wheel (3). The displacement of the micrometer screw (8) is measured by the rotary encoder (5). The device is simple in structure, light and convent to use, has a high resolution and a high precision, and outputs electronic signals to facilitate intellectualization and digitization of a portable hardness tester.

Classes IPC  ?

• G01N 3/42 - Recherche de la dureté ou de la dureté au rebondissement en effectuant des empreintes sous une charge permanente par des dispositifs de pénétration, p. ex. sphère, pyramide

Abrégé

A portable digital display hardness tester comprises a magnetic sucking disc (3), a support base (32), a force measuring device, a pressure head (24), an electronic circuit board (27), a digital display (5), and a stress application and indentation depth measurement device formed by a hand wheel (9), a rotary encoder (33) and a micrometer thread pair. The support base (32) is provided with the rotary encoder (33) thereon, has a micrometer nut (14) disposed in a hole and the digital display (5) disposed at the front, and is fixed on the magnetic sucking disc (3). A micrometer screw (13) is provided in the micrometer nut (14), a rotating shaft (12) of the rotary encoder (33) is connected to the micrometer screw (13) and rotates with the micrometer screw (13), an upper end of the micrometer screw (13) is connected to the hand wheel (9), and the lower end of the micrometer screw (13) is connected to the force measuring device. A lower end of the force measuring device is connected to the pressure head (24). The hand wheel (9), the micrometer screw (13), the force measuring device, and the pressure head (24) are connected and are coaxial, and can axially move with the rotation of the hand wheel (9). The portable digital display hardness tester can be used for rapidly detecting the hardness of a large part on the spot, and testing the Brinell hardness and Vickers hardness by using a bathymetry.

Classes IPC  ?

• G01N 3/42 - Recherche de la dureté ou de la dureté au rebondissement en effectuant des empreintes sous une charge permanente par des dispositifs de pénétration, p. ex. sphère, pyramide
• G01N 3/40 - Recherche de la dureté ou de la dureté au rebondissement