Self-tightening tensile machine clamp

Abstract

The utility model relates to the technical field of tensile machine testing, in particular to a self-tightening tensile machine clamp which comprises a clamp base, a pair of clamping blocks for clamping a cable is connected to the clamp base in a sliding mode, and a clamping gap which is gradually reduced along with cable stretching is reserved between the two clamping blocks. The clamp base is provided with a driving assembly which drives the two clamping blocks to get close to each other so as to clamp the cable. Through the arrangement of the clamping block and the linkage piece for driving the clamping block to keep synchronous movement, the clamping force can be automatically adjusted along with the stretching of the cable, and it is ensured that the stable clamping effect of the cable in different stretching stages can be kept.

Description

Technical Field

[0001] This application relates to the technical field of tensile testing machines, and in particular to a self-tightening tensile testing machine clamp. Background Technology

[0002] A tensile testing machine is a device used to test the tensile properties of various materials. It can measure the force and displacement curves of a material during the tensile process, thereby obtaining multiple mechanical property indicators of the material, such as tensile strength, yield strength, elongation at break, and modulus of elasticity. Its principle is to apply axial tensile force to the material sample being tested through mechanical, hydraulic, or electric means to simulate the tensile action that the material may be subjected to in actual use.

[0003] When testing cables, a tensile testing machine requires the use of clamps. One end of the cable is connected to the tensile testing head, and the other end is clamped and fixed by the clamps, so that the tensile force can be effectively applied to the cable. Without clamps, the cable can easily slip off the force application part of the tensile testing machine during the tensile process, making it impossible to accurately perform tensile testing. Moreover, clamps can ensure that the cable axis is consistent with the direction of the tensile force during the tensile process, avoiding the generation of lateral forces that would affect the accuracy of the test results.

[0004] The existing clamping method is poorly designed, and the clamping force of the clamp is insufficient. After the tensile testing machine applies tension, the cable is prone to slipping in the clamp. The tensile force measured by the tensile testing machine is not the actual tensile force of the cable, which affects the measurement results. In some cases, the cable may even fall off the clamp, causing the test to fail to be completed normally.

[0005] Therefore, a self-tightening tensile testing machine clamp is needed to solve the problem that cables easily slip or even fall off in the clamp during the tensile testing machine's application of tension. Utility Model Content

[0006] This application provides a self-tightening tensile testing machine clamp, the purpose of which is that during the tensile testing machine's application of tensile force to the cable, the clamp can automatically adjust the clamping force to always maintain effective clamping of the cable.

[0007] This application provides a self-tightening tensile testing machine clamp, which adopts the following technical solution:

[0008] A self-tightening tensile testing machine clamp includes a clamp base, on which a pair of clamping blocks for clamping cables are slidably connected. A clamping gap that gradually decreases between the two clamping blocks as the cable is stretched is provided. A drive assembly is installed on the clamp base to drive the two clamping blocks to move closer to each other to clamp the cable.

[0009] By adopting the above technical solution, as the cable is stretched, the two clamping blocks slide on the clamp base, causing the clamping gap to gradually decrease. The cable within the clamping gap is more stably clamped on the clamp. The drive component drives the two clamping blocks to move closer to each other, further reducing the clamping gap and further enhancing the clamping degree of the cable on the clamp. Compared with the prior art, this clamp can automatically adjust the clamping force as the cable is stretched, ensuring that the cable can maintain a stable clamping effect at different stretching stages.

[0010] Optionally, the clamp base is provided with a receiving groove for accommodating clamping blocks. The receiving groove is trapezoidal in shape, wider at the top and narrower at the bottom, and the sidewalls of the receiving groove are inclined. The two clamping blocks are in contact with the sidewalls of the receiving groove.

[0011] By adopting the above technical solution, the side wall of the clamping block that is in contact with the receiving groove is inclined, so that the sliding path of the clamping block is consistent with the inclination of the side wall of the receiving groove. The two clamping blocks slide in the receiving groove and move closer to each other, thereby ensuring that the clamping blocks can gradually increase the clamping force on the cable, thereby improving the stability and reliability of the clamp.

[0012] Optionally, the two clamping blocks are recessed to form clamping grooves that cover the periphery of the cable.

[0013] By adopting the above technical solution, the clamping groove covers the periphery of the cable, increasing the contact area between the clamp and the cable. This allows the cable to be clamped to the maximum extent when the two clamping blocks clamp the cable, preventing the cable from loosening or falling off during the stretching process.

[0014] Optionally, the inner wall of the clamping groove is provided with a plurality of anti-slip protrusions evenly distributed along the circumferential and length directions of the clamping groove.

[0015] By adopting the above technical solution, the anti-slip ridges can increase the friction between the cable and the clamping block, prevent the cable from slipping during the stretching process, further improve the stability and reliability of the clamping fixture, and make the clamping force of the clamping block more uniform on the cable surface, thus extending the service life of the cable.

[0016] Optionally, a guide bar extending along the sliding direction of the clamping block is fixedly installed on the clamping base, and a guide groove is recessed on the clamping block to slide with the guide bar.

[0017] By adopting the above technical solution, the guide bar and the guide groove slide together to ensure that the clamping block maintains a precise and stable sliding trajectory in the receiving groove, and avoids the clamping block from shifting, which would cause the cable clamping to become unstable.

[0018] Optionally, the two clamping blocks are movably connected to a linkage plate that drives the clamping blocks to move synchronously. The driving assembly includes a lever rotatably mounted on the clamping base and an elastic element fixedly mounted on the clamping base and pulling the lever to the side where the clamping base is located. The lever includes a free end fixedly connected to the elastic element and an abutting end that abuts against the linkage plate.

[0019] By adopting the above technical solution, the linkage plate is designed so that the two clamping blocks can move synchronously when driven, thereby ensuring that the cable is clamped evenly. The elastic element is designed so that the free end of the lever is always held by the elastic element, thereby keeping the contact end of the lever in contact with the linkage plate, pushing the linkage plate to bring the two clamping blocks closer together, and achieving a stable clamping effect.

[0020] Optionally, the contact end of the lever includes an arc-shaped portion, and one side of the linkage plate is recessed to form an arc-shaped groove that slides with the arc-shaped portion. The arc-shaped groove extends arc-shapedly along the rotation direction of the contact end.

[0021] By adopting the above technical solution, the arc-shaped part and the arc-shaped groove slide together, so that the lever can push the linkage plate more smoothly during rotation. The arc-shaped groove extends arc-shaped along the rotation direction of the contact end to ensure that the contact between the lever and the linkage plate always remains smooth.

[0022] Optionally, a linkage plate is movably connected to the two clamping blocks, and the driving assembly includes a driving cylinder that abuts against the linkage plate to drive the linkage plate to move.

[0023] By adopting the above technical solution, the driving cylinder drives the linkage plate to move the clamping blocks closer to each other, further increasing the clamping effect of the cable. The driving force of the driving cylinder can be precisely controlled according to the requirements, making the clamping process of the clamping blocks on the cable more reliable and stable.

[0024] Optionally, the corner of the receiving groove is recessed to form a relief groove corresponding to the corner position of the clamping block.

[0025] By adopting the above technical solution and setting the clearance groove, the corners of the clamping block are prevented from colliding with the fixture base, the wear of the clamping block is prevented, and the service life of the fixture as a whole is extended.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Compared with existing technologies, this clamp can automatically adjust the clamping force as the cable is stretched, ensuring that the cable can maintain a stable clamping effect at different stretching stages;

[0028] 2. The linkage plate is designed so that the two clamping blocks can move synchronously when driven, thus ensuring that the cable is clamped evenly. The elastic element is designed so that the free end of the lever is always held by the elastic element, thus keeping the contact end of the lever in contact with the linkage plate, pushing the linkage plate to bring the two clamping blocks closer together, further enhancing the stable clamping effect of the cable.

[0029] 3. The arc-shaped part and the arc-shaped groove slide together, which allows the lever to push the linkage plate more smoothly during rotation. The arc-shaped groove extends in an arc along the rotation direction of the contact end to ensure that the contact between the lever and the linkage plate remains smooth at all times. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application;

[0031] Figure 2 This is a partial structural schematic diagram of Embodiment 1 of this application, used to illustrate the state of the lever and the spring-driven linkage plate moving;

[0032] Figure 3 This is a partial cross-sectional view of Embodiment 2 of this application, used to show the state of the drive cylinder driving the linkage plate to move.

[0033] Reference numerals: 1. Fixture base; 2. Clamping block; 3. Clamping gap; 4. Drive assembly; 5. Connector; 6. Mounting hole; 7. Receiving groove; 8. Clearance groove; 9. Clamping groove; 10. Anti-slip convex strip; 11. Guide plate; 12. First through hole; 13. First threaded hole; 14. First bolt; 15. Guide strip; 16. Guide groove; 17. Placement groove; 18. Linkage plate; 19. Movable cavity; 20. Connector; 21. Second through hole; 22. Second threaded hole; 23. Second bolt; 24. Rotating shaft; 25. Lever; 26. Round hole; 27. Spring; 28. Free end; 29. ​​Abutting end; 30. Arc-shaped part; 31. Arc-shaped groove; 32. Drive cylinder; 33. Output end. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0035] Example 1:

[0036] A self-tightening tensile testing machine clamp, reference Figure 1The fixture includes a clamp base 1, on which two clamping blocks 2 slide. A clamping gap 3 is left between the clamping blocks 2 to clamp the cable. One end of the cable is located in the clamping gap 3, and the end of the cable away from the clamping blocks 2 is connected to a tensile testing machine. Under the tension of the tensile testing machine, the two clamping blocks 2 slide in the clamp base 1 and move closer to each other. The clamping gap 3 gradually decreases, and the clamping force of the clamping blocks 2 on the cable increases accordingly. A drive assembly 4 is installed on the clamp base 1. After the drive assembly 4 is driven, it further drives the two clamping blocks 2 to move closer to each other, and the clamping degree of the cable on the fixture is further enhanced.

[0037] refer to Figure 1 The clamp base 1 is made of alloy material, which has good strength and stability. A connector 5 is fixedly installed on the top of the clamp base 1. The clamp base 1 is installed on the tensile testing machine through the connector 5 to ensure that the tensile force can be applied to the cable stably and evenly during the tensile test. At the same time, the connector 5 helps to correctly install and position the clamp base 1 on the tensile testing machine, ensuring that the direction of the tensile force coincides with the axis of the cable. The connector 5 has a through hole 6, which is used to install it onto the body of the tensile testing machine.

[0038] refer to Figure 1 A receiving groove 7 is recessed on one side of the clamp base 1. A relief groove 8 is recessed at the corner of the receiving groove 7. The relief groove 8 is arc-shaped and corresponds to the corner of the clamping block 2. The shape of the receiving groove 7 is trapezoidal, wider at the top and narrower at the bottom. The two opposite side walls of the receiving groove 7 are inclined. The two clamping blocks 2 are respectively attached to and abut against the two side walls of the receiving groove 7. The clamping blocks 2 slide along the side walls, so that the two clamping blocks 2 are close to each other and the clamping gap 3 gradually decreases. The ends of the two clamping blocks 2 that are close to each other are respectively recessed to form clamping grooves 9. The clamping grooves 9 are set along the length direction of the clamping blocks 2. The clamping grooves 9 are semi-circular and the two clamping grooves 9 cover the periphery of the cable. Multiple anti-slip ridges 10 are protruding from the inner wall of the clamping grooves 9. The anti-slip ridges 10 are evenly distributed along the circumferential and length directions of the clamping grooves 9 to increase the friction between the cable and the clamping block 2 and prevent the cable from loosening or falling off.

[0039] refer to Figure 2Two guide plates 11 are fixedly installed on the fixture base 1. The two guide plates 11 are symmetrically arranged on both sides of the receiving groove 7. A first through hole 12 is opened on the guide plate 11, a first threaded hole 13 is opened on the fixture base 1, and a first bolt 14 is provided on the guide plate 11. The first bolt 14 passes through the first through hole 12 and is threadedly connected to the first threaded hole 13. The guide plate 11 is locked and fixed to the fixture base 1 by the threaded engagement of the first bolt 14 and the first threaded hole 13. A guide strip 15 is formed by protruding from one end of the guide plate 11 facing the fixture base 1. The guide strip 15 extends along the sliding direction of the clamping block 2. A guide groove 16 is recessed on the clamping block 2 to slide and engage with the guide strip 15, so as to ensure that the clamping block 2 remains stable during the sliding process.

[0040] refer to Figure 1 and Figure 2 Two clamping blocks 2 have corresponding placement slots 17, and a linkage plate 18 is provided in the placement slot 17. The two placement slots 17 surround a movable cavity 19 for the linkage plate 18 to move. There is a gap between the two ends of the linkage plate 18 and the inner wall of the placement slot 17. As the two clamping blocks 2 move closer or further away from each other, the linkage plate 18 and the clamping blocks 2 slide relative to each other along the length of the linkage plate 18. A connector 20 is fixedly connected to the clamping base 1. The connector 20 has a second through hole 21 and a second threaded hole 22. A second bolt 23 is detachably connected to the connector 20. The second bolt 23 passes through the second through hole 21 on the connector 20 and is threaded into the second threaded hole 22 to lock the connector 20 to the clamping base 1. A rotating shaft 24 is fixedly installed on the connector 20. The drive assembly 4 includes... The drive assembly 4 includes a lever 25 with a circular hole 26. The lever 25 rotates around the shaft 24 through the circular hole 26 to achieve rotational engagement with the connector 20. The drive assembly 4 also includes an elastic element, which in this embodiment is a spring 27. One end of the spring 27 is fixedly installed on the connector 20, and the other end is fixedly installed on the end of the lever 25 away from the shaft 24. The end of the lever 25 connected to the spring 27 is the free end 28. The spring 27 always pulls the free end 28 of the lever 25. Under the tension of the spring 27, the lever 25 rotates around the shaft 24 toward the side where the clamp base 1 is located. The end of the lever 25 away from the spring 27 is the contact end 29, which abuts against the top surface of the linkage plate 18. The rotation of the lever 25 causes the contact end 29 to abut against the linkage plate 18 and move downward, thereby causing the clamping block 2 to slide downward, and the cable is gradually clamped.

[0041] refer to Figure 2The contact end 29 of the lever 25 includes an arc-shaped portion 30, which protrudes from the end of the contact end 29. The top surface of the linkage plate 18 is recessed to form an arc-shaped groove 31, which extends arc-shapedly along the rotation direction of the contact end 29. The arc-shaped portion 30 and the arc-shaped groove 31 slide together, which makes it easier for the lever 25 to push the linkage plate 18 downward more smoothly when it rotates, thereby driving the clamping block 2 to move synchronously.

[0042] The implementation principle of Embodiment 1 of this application is as follows: When testing the tensile performance of the cable, the clamping block 2 is manually pushed upward. Under the action of the linkage plate 18, the two clamping blocks 2 move upward synchronously. The linkage plate 18 abuts against the lever 25 and rotates. The free end 28 of the lever 25 moves away from the clamp base 1, the spring 27 is stretched, the clamping gap 3 becomes larger, the cable is placed into the clamping groove 9, the clamping block 2 is stopped, the spring 27 returns to its deformation and drives the lever 25 to rotate. The abutting end 29 of the lever 25 abuts against the linkage plate 18. The linkage plate 18 drives the clamping block 2 to slide downward to clamp the cable. The tensile testing machine applies tension to the cable. As the cable is stretched, the two clamping blocks 2 move closer to each other, and the clamping force of the cable increases further.

[0043] Example 2:

[0044] A self-tightening tensile testing machine clamp, reference Figure 3 The difference from Embodiment 1 is that the drive assembly 4 is different from that in Embodiment 1. The drive assembly 4 includes a drive cylinder 32, which is fixedly installed on the clamp base 1. The output end 33 of the drive cylinder 32 abuts against the top surface of the linkage plate 18. The pressure of the drive cylinder 32 can be flexibly adjusted according to different types of cables.

[0045] The implementation principle of Embodiment 2 of this application is as follows: the drive cylinder 32 is started, the output end 33 of the drive cylinder 32 abuts against the linkage plate 18 and moves downward, thereby driving the clamping block 2 to move closer, the clamping gap 3 is reduced, and the cable is further clamped.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-tightening tensile testing machine clamp, characterized in that: Includes a clamp base (1), on which a pair of clamping blocks (2) for clamping cables are slidably connected, and a clamping gap (3) is left between the two clamping blocks (2) that gradually decreases as the cable is stretched, and a drive assembly (4) is installed on the clamp base (1) to drive the two clamping blocks (2) to move closer to each other to clamp the cable.

2. The self-tightening tensile testing machine clamp according to claim 1, characterized in that: The clamp base (1) is provided with a receiving groove (7) for accommodating clamping blocks (2). The shape of the receiving groove (7) is trapezoidal with a wider top and a narrower bottom, and the side wall of the receiving groove (7) is inclined. The two clamping blocks (2) are in contact with the side wall of the receiving groove (7).

3. The self-tightening tensile testing machine clamp according to claim 2, characterized in that: The two clamping blocks (2) have recessed clamping grooves (9) that cover the periphery of the cable.

4. A self-tightening tensile testing machine clamp according to claim 3, characterized in that: The inner wall of the clamping groove (9) is evenly distributed with multiple anti-slip protrusions (10) along the circumferential and length directions of the clamping groove (9).

5. A self-tightening tensile testing machine clamp according to claim 1, characterized in that: A guide bar (15) extending along the sliding direction of the clamping block (2) is fixedly installed on the clamping base (1), and a guide groove (16) is recessed on the clamping block (2) to slide with the guide bar (15).

6. A self-tightening tensile testing machine clamp according to claim 1, characterized in that: The two clamping blocks (2) are movably connected to a linkage plate (18) that drives the clamping blocks (2) to move synchronously. The drive assembly (4) includes a lever (25) rotatably mounted on the clamp base (1) and an elastic member fixedly mounted on the clamp base (1) and pulling the lever (25) to the side where the clamp base (1) is located. The lever (25) includes a free end (28) fixedly connected to the elastic member and an abutting end (29) that abuts against the linkage plate (18).

7. A self-tightening tensile testing machine clamp according to claim 6, characterized in that: The contact end (29) of the lever (25) includes an arc-shaped portion (30), and one side of the linkage plate (18) is recessed to form an arc-shaped groove (31) that slides with the arc-shaped portion (30). The arc-shaped groove (31) extends arc-shapedly along the rotation direction of the contact end (29).

8. A self-tightening tensile testing machine clamp according to claim 1, characterized in that: The two clamping blocks (2) are movably connected with linkage plates (18), and the drive assembly (4) includes a drive cylinder (32) that abuts against the linkage plates (18) to drive the linkage plates (18) to move.

9. A self-tightening tensile testing machine clamp according to claim 2, characterized in that: The corner of the receiving groove (7) is recessed to form a relief groove (8) corresponding to the corner position of the clamping block (2).

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