CN205449659U - Novel hardness test centre gripping device - Google Patents

Abstract

The utility model provides a novel hardness test centre gripping device, includes base, slider, little lead screw, handle, big lead screw, supporting platform and round pin axle. The base is a tetragonal body that has protruding round platform, and both sides have the closed slide around the tetragonal body upper surface, and the left and right sides has two bellied supporting shoes, it has big screw hole to open in the round platform, big screw hole and the big lead screw cooperation that has round columnar support platform, and it has the pinhole to open in supporting platform's sagittal plane, and the round pin axle is installed in the pinhole to supporting platform's height is adjusted through the round pin axle, it has little screw hole to open on the supporting shoe, little screw hole and the little lead screw cooperation that has the handle, and the other end of little lead screw is connected with the slider that has the arc curved surface, and turning handle makes little lead screw drive the slider and moves on the guide rail. This clamping device can directly place and use on hardness test platform, the utility model discloses can make things convenient for the centre gripping step shaft, have cylindrical assembly sample carries out the hardness test.

Description

A new clamping device for hardness testing

technical field

The utility model belongs to the technical field of testing, in particular to a clamping device for testing the hardness of a stepped shaft sample and a combination sample with a cylinder.

Background technique

Hardness is a performance index to measure the softness and hardness of materials. As a conventional physical and chemical detection method, hardness testing is indispensable in the process of failure analysis and quality inspection. The surface flatness of the metal sample to be tested for hardness testing is relatively high. Only by ensuring that the indenter of the hardness tester is perpendicular to the surface of the sample can the test data be real and reliable. At present, the hardness of the stepped shaft sample and the composite sample with a cylinder is measured. The end face of the small cylinder or the end face of the composite cylinder is the supporting surface. It is necessary to measure the hardness of the other end face, and the area of the supporting surface is smaller than the end face to be tested. In this way, when measuring the hardness, the measurable range of the surface to be tested is small or the support shaft is unstable, resulting in inaccurate measurement results. For this reason, what the utility model is to solve is the problem of measuring the surface hardness of a large measured surface under a small cylindrical support surface.

Contents of the invention

The purpose of the utility model is to provide a clamping device for testing the hardness of a combination sample with a cylinder for clamping a stepped shaft sample.

The technical solution for realizing the purpose of this utility model is: a new type of hardness testing clamping device, including a base, a guide rail, a small lead screw, a handle, a support block, a slider, a support platform, a pin shaft, a large lead screw, and a round table. The base is a square with a raised round platform, the upper surface of the square has parallel guide rails on the front and rear sides, and two raised support blocks on the left and right sides; there is a large threaded hole in the round platform, and the large threaded hole is connected with the belt. The large lead screw with a cylindrical support platform cooperates, and a pin hole is opened in the radial surface of the support platform, and the pin shaft is installed in the pin hole. Turning the pin shaft makes the large lead screw move up and down, thereby adjusting the height of the support platform; There is a small threaded hole on the block, the small threaded hole is matched with a small screw with a handle, the other end of the small screw is connected with the slider with an arc surface, turning the handle makes the small screw drive the slider on the guide rail move up.

The radius of the curved surface of the slider is greater than the radius of the cone.

The thread pair formed by the large lead screw and the threaded hole on the round platform, and the thread pair formed by the small lead screw and the threaded hole on the support block have self-locking performance to prevent the threaded connection from loosening automatically.

The beneficial effects of the utility model are:

(1) in the utility model, the support platform provides bottom support for the sample, and the height of the support platform can be adjusted, thus expanding the testing range of the hardness testing equipment;

(2) The slider can move on the guide rail. Adjust the moving range of the slider according to the radius of the supporting cylinder. The curved surface inside the slider clamps the supporting cylinder, and the upper surface of the slider plays a supporting role. , which not only improves the stability of the specimen during hardness testing, but also expands the testing range of the hardness testing equipment;

(3 ) The device can be directly placed on the testing platform of the hardness testing equipment for use. During the testing process, only the base needs to be moved, and there is no need to repeatedly load and unload the sample, which saves testing time.

Description of drawings

Fig. 1 is an upper and lower isometric axonometric view of the hardness testing clamping device of the present invention.

Figure 2 is a diagram of the test piece

The marks in the figure are as follows: 1. Base; 2. Guide rail; 3. Small screw; 4. Handle; 5. Support block; 6. Slider; 7. Support platform; 8. Pin shaft; 9. Large screw; 10. Round table; 11. Specimen support shaft; 12. The hardness shaft of the specimen to be tested.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the implementation of the utility model will be further described in detail below in conjunction with the accompanying drawings. As shown in Figure 1, this embodiment provides a new clamping device for hardness testing, including a base (1), a slider (6), a small screw (3), a handle (4), and a large screw (9) , support platform (7) and pin shaft (8), the base (1) is a square with a raised round platform (10), the front and rear sides of the upper surface of the square have parallel guide rails (2), left and right There are two raised support blocks (5) on both sides; a large threaded hole is opened in the round platform (10), and the large threaded hole is matched with the large screw (9) with a cylindrical support platform (7). There is a pin hole in the radial plane of (7), and the pin shaft (8) is installed in the pin hole, turning the pin shaft (8) makes the large screw (9) move up and down, thereby adjusting the height of the support platform (7);

There is a small threaded hole on the support block (5), and the small threaded hole cooperates with the small lead screw (3) with the handle (4), and the other end of the small lead screw (3) is connected with the slider ( 6) connected with each other, turn the handle (4) to make the small screw (3) drive the slider (6) to move on the guide rail (2). As shown in Figure 2, the lower surface of the specimen support shaft (11) is placed on the support platform (7). According to the length of the specimen support shaft (11), the pin shaft (8) is used to adjust the position of the support platform (7). height, so that the lower surface of the hardness axis (12) of the specimen to be tested fits the upper surface of the slider (6), so that the slider (6) plays a supporting role, and the slider (6) can be moved by rotating the handle (4). Move on the guide rail (2), and finally make the curved surface of the slider (6) clamp the support shaft (11) of the specimen to avoid shaking during the hardness test, and then measure the hardness shaft (12) of the specimen to be tested. The hardness value of any point on the upper surface of . The hardness measurement can also be carried out for composite samples with cylinders, which greatly expands the testing range of the hardness testing equipment.

Claims (3)

1. A new clamping device for hardness testing, including a base (1), a slider (6), a small screw (3), a handle (4), a large screw (9), a support platform (7) and a pin Shaft (8) characterized by: a. The base (1) is a square with a raised round platform (10), the upper surface of the square has parallel guide rails (2) on the front and rear sides, and two raised support blocks ( 5); b. There is a large threaded hole in the round table (10), which is matched with the large screw (9) with a cylindrical support platform (7), and a pin hole is opened in the radial surface of the support platform (7) , the pin shaft (8) is installed in the pin hole, turning the pin shaft (8) makes the large lead screw (9) move up and down, thereby adjusting the height of the support platform (7); c. There is a small threaded hole on the support block (5), and the small threaded hole is matched with the small screw (3) with the handle (4), and the other end of the small screw (3) is connected with the slide The blocks (6) are connected, and the handle (4) is turned to make the small lead screw (3) drive the slider (6) to move on the guide rail (2). 2. The new clamping device for hardness testing according to claim 1, characterized in that: the radius of the curved surface on the slider (6) is greater than the radius of the circular platform (10). 3. The novel hardness testing clamping device according to claim 1, characterized in that: the screw pair composed of the large lead screw (9) and the threaded hole on the round platform (10), the small lead screw (3) and the support block ( 5) The thread pair formed by the threaded holes on the top has self-locking performance to prevent the threaded connection from loosening automatically.