An integral chuck device for a testing machine that prevents slipping and increases test space

Abstract

The utility model provides an overall chuck device for a testing machine that prevents skidding and increases test space, comprising a lower clamping block and an upper clamping block used symmetrically therewith, the lower clamping block and the upper clamping block can be respectively installed in wedge-shaped grooves of lower and upper bases of an electronic stretching machine, a lower connecting rod is movably installed in the lower clamping block, and an upper connecting rod is movably installed in the upper clamping block; the connecting rod can be movably installed in the upper and lower clamping blocks, the clamping blocks are used in conjunction with the wedge-shaped grooves, the tightness of sample clamping can be adjusted up and down, and different connecting rods with threads are equipped according to the sizes of different sample clamping parts, which can not only prevent the sample from slipping, but also significantly improve the size of the sample clamping space, and has the characteristics of simple and convenient installation, no slipping, and large clamping space.

Description

Technical Field

[0001] The utility model relates to the field of electronic tensile testing machine fixtures, in particular to an anti-slip and test space enlarged testing machine integral chuck device, which is a universal tooling for material performance testing and is mainly used for electronic tensile testing machines to test various materials. Background Art

[0002] The structure of the sample clamping part of the traditional electronic tensile testing machine is basically two pieces of upper and lower chucks, and the wedges are installed on the testing machine. The tensile specimen is clamped in the two wedges on the upper and lower sides respectively. When the test stretching is carried out, the two wedge blocks of the lower chuck are naturally tightened upwards as the test stretching force is applied to clamp the specimen, and the two wedge blocks of the upper chuck are naturally tightened downwards as the test stretching force is applied to clamp the specimen. Due to the small clamping force of the wedge blocks, the specimen often slips during the test, especially when testing some high-strength materials, the test cannot be completed. At the same time, due to the slipping of the specimen during the test, the test material will be subjected to vibration, impact, etc., resulting in inaccurate test data, especially affecting the accuracy of the non-proportional extension strength of the material, and the non-proportional extension strength is the most important design basis in engineering design. In addition, due to the product structure characteristics of different companies, the shapes and sizes of product parts are different. The sample required for processing the specimen is often small (short), and the clamping part of the specimen after processing is small (short). After clamping the upper and lower parts respectively with the existing wedge clamping method, the part of the specimen exposed to the outside is small. If it is necessary to install testing instruments such as electronic extensometers on the exposed part of the specimen, the space is small and it cannot be installed at all.

[0003] The patent application document with publication number CN201203557Y discloses a jaw of an electronic tensile testing machine, which can test metal bar specimens by symmetrically mounting two metal parts on the jaw seat of the electronic tensile testing machine and fixing them with a pressure plate, thereby eliminating the slippage of the specimens. However, due to the single structure, the operation is inconvenient, the sample clamping tightness cannot be adjusted, the clamping space is small, and it cannot adapt to metal bars of more sizes. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide an integral chuck device for a testing machine that prevents slipping and increases the test space, which adopts a clamping block that is compatible with the wedge-shaped groove of the lower and upper bases of the clamping block that cooperates with the electronic tensile machine, and a connecting rod that is compatible with the clamping block. While eliminating the slippage of the sample of the electronic tensile testing machine, it can also significantly improve the size of the sample clamping space. It has the characteristics of simple and convenient installation, no slipping, large clamping space and good adaptability.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The invention discloses an integral clamping device for an anti-skid and test space enlarged testing machine, comprising a lower clamping block 1 and an upper clamping block 3 used symmetrically therewith. The lower clamping block 1 and the upper clamping block 3 can be respectively installed in the wedge-shaped grooves of the lower and upper bases of an electronic stretching machine. A lower connecting rod 2 is movably installed in the lower clamping block 1, and an upper connecting rod 4 is movably installed in the upper clamping block 3.

[0007] The lower clamping block 1 includes a lower base 5 and a lower pedestal 6 connected thereto. The outer side of the connection portion between the lower base 5 and the lower pedestal 6 is a wedge-shaped lower boss 13, and the wedge-shaped lower boss 13 can be used in conjunction with the wedge-shaped groove of the lower base of the electronic tensile testing machine; the lower base 5 is provided with a lower large hole 7, and the lower pedestal 6 is provided with a lower small hole 8 connected to the lower large hole 7.

[0008] The upper clamping block 3 includes an upper base 9 and an upper pedestal 10 connected thereto. The outer side of the connection portion between the upper base 9 and the upper pedestal 10 is a wedge-shaped upper boss 14, and the wedge-shaped upper boss 14 can be used in conjunction with the wedge-shaped groove of the upper base of the electronic tensile testing machine; the upper base 9 is provided with an upper large hole 11, and the upper pedestal 10 is provided with an upper small hole 12 connected to the upper large hole 11.

[0009] The lower connecting rod 2 includes a lower rod end 15 adapted to the lower large hole 7 , the lower rod end 15 is connected to one end of a lower rod body 16 , and the other end of the lower rod body 16 is provided with a lower internal thread; the lower rod body 16 is adapted to the lower small hole 8 .

[0010] The upper connecting rod 4 includes an upper rod end 17 adapted to the upper large hole 11 , the upper rod end 17 is connected to one end of an upper rod body 18 , and the other end of the upper rod body 18 is provided with a lower internal thread; the upper rod body 18 is adapted to the upper small hole 12 .

[0011] The lower clamping block 1, the lower connecting rod 2, the upper clamping block 3 and the upper connecting rod 4 are made of stainless steel material with a hardness of HBC35--40.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model adopts an integral clamp block on the upper and lower sides and a connecting rod with a thread for use. The connecting rod can be movably installed in the upper and lower clamp blocks, and the sample clamping tightness can be adjusted up and down, thereby solving the problem that the electronic extensometer cannot be installed due to the small sample size resulting in a short tensile sample and small tensile space.

[0014] 2. The utility model adopts the upper and lower clamping blocks, the connecting rod and the matching wedge-shaped groove to increase the contact area between the specimen and the chuck, solves the problem of specimen slipping caused by the small clamping force during the tensile test caused by the original wedge-shaped clamping specimen, and ensures that the tensile test is stable and the test data is accurate.

[0015] 3. The utility model is made of stainless steel, which has the characteristics of high strength and no deformation when stretched, ensuring the stability of the device. At the same time, according to the size of the different sample clamping parts, different threaded connecting rods are equipped, making the device more adaptable and universal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model in working state.

[0017] Figure 2 It is a structural schematic diagram of the lower clamping block 1 of the utility model.

[0018] Figure 3 It is a structural schematic diagram of the upper clamping block 3 of the utility model.

[0019] Figure 4 It is a schematic structural diagram of the lower connecting rod 2 of the utility model.

[0020] Figure 5 It is a schematic structural diagram of the upper connecting rod 4 of the utility model.

[0021] Figure 6 It is a structural schematic diagram of the lower clamping block 1 and the lower connecting rod 2 of the utility model in cooperation with each other.

[0022] Figure 7 It is a structural schematic diagram of the upper clamping block 3 and the upper connecting rod 4 of the utility model in cooperation with each other. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] See also Figure 1 , an integral clamping device for a test machine for preventing slippage and increasing test space, comprising a lower clamping block 1 and an upper clamping block 3 used symmetrically therewith, the lower clamping block 1 and the upper clamping block 3 can be respectively installed in the wedge-shaped grooves of the lower and upper bases of the electronic stretching machine, the lower clamping block 1 is movably installed with a lower connecting rod 2, and the upper clamping block 3 is movably installed with an upper connecting rod 4. An upper and lower integral clamping block is used in conjunction with a connecting rod, the connecting rod can be movably installed in the upper and lower clamping blocks, and the clamping tightness of the sample can be adjusted up and down, thereby solving the problem that the electronic extensometer cannot be installed due to the short tensile specimen and small tensile space caused by the small specimen.

[0025] like Figure 2 As shown, the lower clamping block 1 includes a lower base 5 and a lower pedestal 6 connected thereto, the outer side of the connection portion between the lower base 5 and the lower pedestal 6 is a wedge-shaped lower boss 13, and the wedge-shaped lower boss 13 can be used in conjunction with the wedge-shaped groove of the lower base of the electronic tensile testing machine; the lower base 5 is provided with a lower large hole 7, and the lower pedestal 6 is provided with a lower small hole 8 connected to the lower large hole 7.

[0026] like Figure 3 As shown, the upper clamping block 3 includes an upper base 9 and an upper pedestal 10 connected thereto, the outer side of the connection portion between the upper base 9 and the upper pedestal 10 is a wedge-shaped upper boss 14, and the wedge-shaped upper boss 14 can be used in conjunction with the wedge-shaped groove of the upper base of the electronic tensile testing machine; the upper base 9 is provided with an upper large hole 11, and the upper pedestal 10 is provided with an upper small hole 12 connected to the upper large hole 11.

[0027] See also Figure 1 In this embodiment, the diameters of the lower large hole 7 and the upper large hole 11 are both ￠40×33mm, and the diameters of the lower small hole 8 and the upper small hole 12 are both ￠30×35mm.

[0028] like Figure 4 , Figure 6 As shown, the lower connecting rod 2 includes a lower rod end 15 adapted to the lower large hole 7, the lower rod end 15 is connected to one end of a lower rod body 16, and the other end of the lower rod body 16 is provided with a lower internal thread; the lower rod body 16 is adapted to the lower small hole 8.

[0029] like Figure 5 , Figure 7 As shown, the upper connecting rod 4 includes an upper rod end 17 adapted to the upper large hole 11, the upper rod end 17 is connected to one end of an upper rod body 18, and the other end of the upper rod body 18 is provided with a lower internal thread; the upper rod body 18 is adapted to the upper small hole 12. Figure 1 In this embodiment, the size of the two connecting rod ends is ￠39×25mm, the size of the rod body is ￠29×95mm, and the size of the internal thread of the rod body can be determined according to different sample sizes, so that the device has better adaptability and versatility.

[0030] The lower clamping block 1, the lower connecting rod 2, the upper clamping block 3, and the upper connecting rod 4 are made of stainless steel with a hardness of HBC35-40. The stainless steel material has the characteristics of high strength and no deformation under stretching, which ensures the stability of the device.

[0031] The working principle of the utility model is:

[0032] The purpose of the utility model is mainly to increase the test space during the tensile test and facilitate the installation and removal of the electronic extensometer. First, according to the shape and structure of the original electronic tensile test machine chuck, the lower clamp block 1 and the upper clamp block 3 that can be installed in coordination are designed. The lower clamp block 1 and the upper clamp block 3 can be used in coordination with the wedge-shaped groove of the tensile test machine respectively. First, the lower connecting rod 2 and the upper connecting rod 4 are respectively inserted into the lower clamp block 1 and the upper clamp block 3, and then the lower clamp block 1 and the upper clamp block 3 loaded with the connecting rod are respectively installed in the upper and lower chucks of the electronic tensile test machine, and the two ends of the tensile specimen are respectively screwed into the lower connecting rod 2 and the upper connecting rod 4. By adjusting the distance between the upper and lower chucks of the electronic tensile test machine and the gap between the connecting rod and the matching clamp block, the tightness of the tensile specimen can be adjusted. After the test is installed firmly, the electronic extensometer can be installed on the specimen and the corresponding tensile test can be carried out. The outer dimensions of the lower connecting rod 2 and the upper connecting rod 4 remain unchanged, and the size (diameter) of the threaded hole on the upper (lower) part thereof matches the size of both ends of the tensile specimen, and different connecting rods can be processed and configured according to different sizes of tensile specimens.

Claims

1. An anti-skid and test space enlargement testing machine integral chuck device, characterized in that: The invention comprises a lower clamping block (1) and an upper clamping block (3) used symmetrically therewith. The lower clamping block (1) and the upper clamping block (3) can be respectively installed in wedge-shaped grooves of the lower and upper bases of the electronic tensile testing machine. A lower connecting rod (2) is movably installed in the lower clamping block (1), and an upper connecting rod (4) is movably installed in the upper clamping block (3).

2. The anti-skid and test space enlargement testing machine integral chuck device according to claim 1, characterized in that: The lower clamping block (1) comprises a lower base (5) and a lower pedestal (6) connected thereto; the outer side of the connection portion between the lower base (5) and the lower pedestal (6) is a wedge-shaped lower boss (13); the wedge-shaped lower boss (13) can be used in conjunction with the wedge-shaped groove of the lower base of the electronic tensile testing machine; the lower base (5) is provided with a lower large hole (7); the lower pedestal (6) is provided with a lower small hole (8) connected to the lower large hole (7).

3. The anti-skid and test space enlargement testing machine integral chuck device according to claim 1, characterized in that: The upper clamping block (3) comprises an upper base (9) and an upper pedestal (10) connected thereto; the outer side of the connection portion between the upper base (9) and the upper pedestal (10) is a wedge-shaped upper boss (14); the wedge-shaped upper boss (14) can be used in conjunction with the wedge-shaped groove of the upper base of the electronic tensile testing machine; the upper base (9) is provided with an upper large hole (11); the upper pedestal (10) is provided with an upper small hole (12) connected to the upper large hole (11).

4. The anti-skid and test space enlargement testing machine integral chuck device according to claim 1, characterized in that: The lower connecting rod (2) comprises a lower rod end (15) adapted to the lower large hole (7), the lower rod end (15) being connected to one end of a lower rod body (16), the other end of the lower rod body (16) being provided with a lower internal thread; the lower rod body (16) being adapted to the lower small hole (8).

5. The anti-skid and test space enlargement testing machine integral chuck device according to claim 1, characterized in that: The upper connecting rod (4) comprises an upper rod end (17) adapted to the upper large hole (11), the upper rod end (17) being connected to one end of an upper rod body (18), the other end of the upper rod body (18) being provided with a lower internal thread; the upper rod body (18) being adapted to the upper small hole (12).

6. The anti-skid and test space enlargement testing machine integral chuck device according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The lower clamping block (1), the lower connecting rod (2), the upper clamping block (3) and the upper connecting rod (4) are made of stainless steel material with a hardness of HBC35-40.

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