Hot extension test clamp

Abstract

The utility model belongs to the technical field of cable detection, and discloses a thermal extension test fixture. The hot extension test fixture comprises a test plate and a clamping structure, the clamping structure is fixed on the test plate, the clamping structure comprises a connecting assembly and two oppositely arranged clamping plates, and the connecting assembly is connected between the tail ends of the two clamping plates. The clamping structure is arranged on the test plate, and the elastic torsion piece provides clamping force, so that the clamping stability of a cable sample is ensured; the connecting rods are connected to the supporting parts of the clamping plates and can move in the direction close to or away from the front ends of the clamping plates, the elastic torsion pieces are driven to move when the connecting rods move, the relative positions of the elastic torsion pieces and the two clamping plates are changed, and therefore the distribution position of clamping force is changed; when the elastic torsion part gradually gets close to the front ends of the two clamping plates, the deformation degree of the elastic torsion part can be gradually increased due to the fact that the space between the two clamping plates is gradually reduced, and therefore the clamping force is changed, and good flexibility is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable detection, in particular to a thermal elongation test fixture. Background Art

[0002] To evaluate the elongation performance of a cable under high-temperature conditions, a thermal elongation test needs to be carried out on the cable. In the thermal elongation test, the cable sample will be exposed to a high-temperature environment, and then its elongation performance and thermal stability are measured, which helps to ensure the reliability and safety of the cable under high-temperature conditions.

[0003] In the prior art, the thermal elongation test fixture cannot firmly clamp the cable sample. During the test, the cable sample often falls off, resulting in frequent test failures, increasing the time cost, and reducing the test efficiency; moreover, it is difficult to adjust the clamping force magnitude and distribution position of the thermal elongation test fixture, and the flexibility is poor.

[0004] That is, the existing thermal elongation test fixture has the disadvantages of being unable to firmly clamp the cable sample, having a high time cost and reducing the test efficiency, and being difficult to adjust the clamping force magnitude and distribution position, resulting in poor flexibility. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a thermal elongation test fixture to solve the problems that the existing thermal elongation test fixture cannot firmly clamp the cable sample, has a high time cost and reduces the test efficiency, and is difficult to adjust the clamping force magnitude and distribution position, resulting in poor flexibility.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a thermal elongation test fixture, which includes a test plate and a clamping structure. The clamping structure is fixed on the test plate, and the clamping structure includes:

[0008] Two oppositely arranged clamping plates. The front ends of the two clamping plates abut against each other for clamping the cable sample, and a supporting portion protrudes from the clamping plate.

[0009] A connecting component is connected between the ends of the two clamping plates. The connecting component includes a connecting rod and an elastic torsion member sleeved on the connecting rod. The connecting rod is connected to the supporting portions of the two clamping plates and can move in a direction close to or away from the front end of the clamping plate. The two ends of the elastic torsion member respectively abut against the two clamping plates.

[0010] As an optional technical solution of the thermal elongation test fixture, waist-shaped long holes are provided on the supporting portions, and the connecting rod passes through the waist-shaped long holes and can slide along the hole walls of the waist-shaped long holes.

[0011] As an alternative technical solution for a heat elongation test fixture, the connecting component further includes two limiting members, which are respectively fixedly connected to both ends of the connecting rod, and the limiting members can abut against the supporting portion.

[0012] As an alternative technical solution for a heat elongation test fixture, the connecting component further includes an elastic gasket, which is sleeved on the connecting rod, and the elastic gasket is located between the limiting member and the supporting portion.

[0013] As an alternative technical solution for a heat elongation test fixture, an isolation pad for contacting the cable sample is provided on the clamping plate.

[0014] As an alternative technical solution for a heat elongation test fixture, a groove is provided on the clamping plate, and at least a part of the isolation pad is embedded in the groove.

[0015] As an alternative technical solution for a heat elongation test fixture, the clamping plate is in a T shape, and the clamping plate includes:

[0016] A fixed area, where the connecting component is located between the fixed areas of the two clamping plates;

[0017] A clamping area, which is connected to the end of the fixed area, and the clamping areas of the two clamping plates abut against each other for clamping the cable sample.

[0018] As an alternative technical solution for a heat elongation test fixture, a handle is provided on the test plate.

[0019] As an alternative technical solution for a heat elongation test fixture, the heat elongation test fixture further includes a first fastener. A first mounting hole is provided on the test plate, and the first fastener penetrates through one of the clamping plates and its end is in threaded cooperation with the first mounting hole.

[0020] As an alternative technical solution for a heat elongation test fixture, a plurality of clamping structures are arranged at intervals, and the first mounting holes are arranged in one-to-one correspondence with the clamping structures.

[0021] Beneficial effects:

[0022] The present utility model provides a heat elongation test fixture. The heat elongation test fixture includes a test plate and a clamping structure. The clamping structure is fixed on the test plate. The clamping structure includes a connecting component and two oppositely arranged clamping plates. The front ends of the two clamping plates abut against each other for clamping a cable sample. A supporting portion protrudes from the clamping plate. The connecting component is connected between the ends of the two clamping plates. The connecting component includes a connecting rod and an elastic torsion member. The connecting rod is connected to the supporting portions of the two clamping plates and can move in a direction close to or away from the front end of the clamping plate. The elastic torsion member is sleeved on the connecting rod, and the two ends of the elastic torsion member respectively abut against the two clamping plates. By providing a clamping structure on the test plate, the front ends of the two clamping plates of the clamping structure abut against each other so as to clamp and fix the cable sample. The elastic torsion member provides a clamping force to ensure the stability of the clamping of the cable sample, avoid the cable sample from falling off during the test, save the test time and improve the test efficiency. By arranging the connecting rod to be connected to the supporting portion of the clamping plate and capable of moving in a direction close to the front end of the clamping plate, and sleeving the elastic torsion member on the connecting rod, when the connecting rod moves, it drives the elastic torsion member to move, and the relative positions of the elastic torsion member and the two clamping plates change, thereby changing the distribution position of the clamping force. As the elastic torsion member gradually approaches the front ends of the two clamping plates, since the space between the two clamping plates gradually decreases, the deformation degree of the elastic torsion member will gradually increase, thereby changing the magnitude of the clamping force, which has good flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the heat elongation test fixture provided by an embodiment of the present utility model;

[0024] Figure 2 is a partial structural exploded view of the heat elongation test fixture provided by an embodiment of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the clamping structure provided by an embodiment of the present utility model;

[0026] Figure 4 is an exploded view of the clamping structure provided by an embodiment of the present utility model;

[0027] Figure 5 is Figure 4 a partial enlarged view of part A in

[0028] In the figure:

[0029] 10. Test plate; 11. First mounting hole; 12. Handle;

[0030] 20. Clamping structure; 21. Clamping plate; 211. First clamping plate; 212. Second clamping plate; 213. Supporting portion; 22. Connecting component; 221. Connecting rod; 222. Elastic torsion member; 223. Limiting member; 224. Elastic gasket; 23. Isolation pad;

[0031] 30. The first fastener. Detailed implementation mode

[0032] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0035] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have any special meaning.

[0036] Such as Figures 1 to 5As shown in the figure, this embodiment provides a thermal elongation test fixture, which includes a test plate 10 and a clamping structure 20. The clamping structure 20 is fixed on the test plate 10. The clamping structure 20 includes a connecting component 22 and two relatively arranged clamping plates 21. The front ends of the two clamping plates 21 abut against each other for clamping a cable sample. A supporting portion 213 protrudes from the clamping plate 21. The connecting component 22 is connected between the ends of the two clamping plates 21. The connecting component 22 includes a connecting rod 221 and an elastic torsion member 222. The connecting rod 221 is connected to the supporting portions 213 of the two clamping plates 21 and can move in a direction close to or away from the front end of the clamping plate 21. The elastic torsion member 222 is sleeved on the connecting rod 221, and both ends of the elastic torsion member 222 abut against the two clamping plates 21 respectively.

[0037] By providing the clamping structure 20 on the test plate 10, the front ends of the two clamping plates 21 of the clamping structure 20 abut against each other so as to be able to clamp and fix the cable sample. The elastic torsion member 222 provides a clamping force to ensure the stability of the cable sample clamping, avoid the cable sample falling off during the test, save the test time and improve the test efficiency; by providing the connecting rod 221 connected to the supporting portion 213 of the clamping plate 21 and capable of moving in a direction close to or away from the front end of the clamping plate 21, and sleeving the elastic torsion member 222 on the connecting rod 221, when the connecting rod 221 moves, it drives the elastic torsion member 222 to move, and the relative positions of the elastic torsion member 222 and the two clamping plates 21 change, thereby changing the distribution position of the clamping force; as the elastic torsion member 222 moves gradually closer to the front ends of the two clamping plates 21, since the space between the two clamping plates 21 gradually decreases, the deformation degree of the elastic torsion member 222 will gradually increase, thereby changing the magnitude of the clamping force, which has good flexibility.

[0038] In this embodiment, the test plate 10 extends in the horizontal direction; a plurality of clamping structures 20 are provided, and the plurality of clamping structures 20 are arranged at intervals in the horizontal direction; each clamping structure 20 can clamp a cable sample alone; each clamping structure 20 includes two clamping plates 21, and the two clamping plates 21 are respectively a first clamping plate 211 and a second clamping plate 212. The first clamping plate 211 is fixed on the test plate 10; one end of the elastic torsion member 222 abuts against the first clamping plate 211, and the other end abuts against the second clamping plate 212. By providing a plurality of clamping structures 20, a plurality of cable samples can be clamped and fixed at the same time, which helps to further improve the test efficiency. Optionally, the distance between two adjacent clamping structures 20 is equal.

[0039] In order to fix the clamping structure 20 on the test plate 10, the thermal elongation test fixture includes a first fastener 30. A first mounting hole 11 is provided on the test plate 10. The first fastener 30 penetrates through the first clamping plate 211, and its end is in threaded cooperation with the first mounting hole 11. Correspondingly, the first mounting holes 11 are arranged in one-to-one correspondence with the clamping structures 20. In this embodiment, a plurality of first mounting holes 11 are evenly spaced in the horizontal direction; the first fastener 30 can be a bolt. By using the threaded cooperation between the first fastener 30 and the first mounting hole 11, the first clamping plate 211 is fixed to the test plate 10; this can not only ensure the stability of the fixation of the clamping structure 20, but also when the clamping structure 20 is damaged, the corresponding first fastener 30 can be removed to replace the damaged clamping structure 20 in time.

[0040] In this embodiment, a plurality of clamping structures 20 are all fixed on the top surface of the test plate 10; there are six clamping structures 20 in total; the first mounting holes 11 are circular holes and extend in the vertical direction.

[0041] Optionally, a handle 12 is provided on the test plate 10. By providing the handle 12 on the test plate 10, the user can hold the handle 12 to easily pick up and move the thermal elongation test fixture. In this embodiment, the clamping structure 20 is arranged above the test plate 10 and extends from one side of the test plate 10, and the handle 12 is fixed to the other side of the test plate 10.

[0042] See Figure 2 , the clamping plate 21 is T-shaped. The clamping plate 21 includes a fixed area and a clamping area connected to the end of the fixed area. The connecting component 22 is located between the fixed areas of the two clamping plates 21 (i.e., the first clamping plate 211 and the second clamping plate 212); the clamping areas of the two clamping plates 21 are abutted against each other for clamping the cable sample. In this embodiment, both the first clamping plate 211 and the second clamping plate 212 are T-shaped; the fixed area of the first clamping plate 211 overlaps on the test plate 10, the fixed area of the first clamping plate 211 is arranged above the test plate 10 and the clamping area is located on one side of the test plate 10; the second clamping plate 212 is arranged on the top of the first clamping plate 211.

[0043] In the initial state, the plane where the first clamping plate 211 is located intersects with the plane where the second clamping plate 212 is located, and the clamping area of the first clamping plate 211 is in partial contact with the clamping area of the second clamping plate 212; when an external force acts on the clamping structure 20, the second clamping plate 212 rotates around the connecting rod 221. When the plane where the first clamping plate 211 is located is parallel to the plane where the second clamping plate 212 is located, the cable sample can be placed between the clamping areas of the two clamping plates 21 at this time.

[0044] Optionally, an isolation pad 23 for contacting the cable sample is provided on the clamping plate 21, and the material of the isolation pad 23 is a soft material; a groove is provided in the clamping area of the clamping plate 21, and the isolation pad 23 is at least partially embedded in the groove. By providing the isolation pad 23 on the clamping plate 21, the isolation pad 23 can play a buffering role between the clamping plate 21 and the cable sample, avoiding excessive clamping force of the clamping structure 20 and causing the cable sample to break. By providing a groove on the clamping plate 21, a setting space for the isolation pad 23 is provided. In this embodiment, grooves are provided in the clamping areas of the first clamping plate 211 and the second clamping plate 212, and an isolation pad 23 is embedded in each groove, and the two isolation pads 23 are located between the first clamping plate 211 and the second clamping plate 212.

[0045] In order to fix the isolation pad 23 on the clamping plate 21, the heat elongation test fixture includes a second fastener and a locking member. The second fastener sequentially passes through the isolation pad 23 and the clamping plate 21, and the end is threadedly connected to the locking member; the second fastener can be a bolt, and the locking member can be a nut.

[0046] Optionally, the two second fasteners are arranged side by side at intervals in the horizontal direction. The two second fasteners are vertically passed through the isolation pad 23 and the clamping plate 21 and are respectively threadedly connected to a locking member. By providing two second fasteners to fix the same isolation pad 23, the accuracy of the position of the isolation pad 23 can be ensured, and the dislocation caused by the movement or rotation of the isolation pad 23 can be avoided.

[0047] In this embodiment, the isolation pad 23 on the first clamping plate 211 is fixed by two second fasteners and two locking members, and the isolation pad 23 on the second clamping plate 212 is also fixed by two second fasteners and two locking members.

[0048] See Figures 3 to 5, the supporting part 213 is in a flat plate shape and extends in a direction perpendicular to the plane where the clamping plate 21 is located; there are two oppositely arranged supporting parts 213 on the first clamping plate 211, and there are two oppositely arranged supporting parts 213 on the second clamping plate 212. The distance between the two supporting parts 213 on the first clamping plate 211 is greater than the distance between the two supporting parts 213 on the second clamping plate 212, and the two supporting parts 213 on the second clamping plate 212 are located between the two supporting parts 213 on the first clamping plate 211. In other embodiments, it is also possible to set the distance between the two supporting parts 213 on the first clamping plate 211 to be less than the distance between the two supporting parts 213 on the second clamping plate 212, so that the two supporting parts 213 on the first clamping plate 211 are located between the two supporting parts 213 on the second clamping plate 212; it is also possible to set the distance between the two supporting parts 213 on the first clamping plate 211 to be equal to the distance between the two supporting parts 213 on the second clamping plate 212, so that the supporting parts 213 on the first clamping plate 211 and the second clamping plate 212 are arranged in an alternating manner, so that one supporting part 213 on the first clamping plate 211 and one supporting part 213 on the second clamping plate 212 are located on the outside.

[0049] Optionally, the supporting part 213 is provided with an oblong hole, and the connecting rod 221 is inserted into the oblong hole and can slide along the hole wall of the oblong hole; the connecting component 22 further includes two limiting members 223, and the two limiting members 223 are respectively fixedly connected to both ends of the connecting rod 221, and the limiting member 223 can abut against the supporting part 213. By providing the oblong hole, the hole wall of the oblong hole guides the sliding of the connecting rod 221, thereby restricting the sliding direction of the connecting rod 221; by providing the limiting members 223 at both ends of the connecting rod 221, the connecting rod 221 can be prevented from moving left and right. In this embodiment, the limiting member 223 is threadedly connected to the connecting rod 221; after adjusting the position, the limiting member 223 is tightened, and the limiting member 223 can abut against the supporting part 213, thereby fixing the connecting rod 221 to the clamping structure 20 and restricting the relative movement between the connecting rod 221 and the supporting part 213.

[0050] In this embodiment, the two supporting parts 213 on the first clamping plate 211 are located on the outside; the elastic torsion member 222 is located between the two supporting parts 213 on the second clamping plate 212; one end of the elastic torsion member 222 abuts against the fixed area of the first clamping plate 211, and the other end abuts against the fixed area of the second clamping plate 212; the elastic torsion member 222 can be a torsion spring. The supporting parts 213 on both the first clamping plate 211 and the second clamping plate 212 are provided with oblong holes, and the connecting rod 221 is inserted into the four oblong holes; the two limiting members 223 are located outside the two supporting parts 213 on the first clamping plate 211; the oblong holes extend in a direction perpendicular to the plane where the supporting part 213 is located and penetrate through the supporting part 213, and the connecting rod 221 is a round rod.

[0051] Optionally, the connecting assembly 22 includes an elastic gasket 224, which is sleeved on the connecting rod 221 and is located between the stopper 223 and the support portion 213. By arranging the elastic gasket 224 between the stopper 223 and the support portion 213, the connecting rod 221 and the stopper 223 can be fixed more tightly to the clamping structure 20, thereby preventing the connecting rod 221 from sliding in the waist-shaped long hole during the test. In this embodiment, two elastic gaskets 224 are provided, and the elastic gaskets 224 are located between one stopper 223 and one support portion 213 on the first clamping plate 211.

[0052] The following is the specific use process of the thermal extension test fixture:

[0053] A plurality of clamping structures 20 are fixed on the test plate 10 by means of a first fastener 30; when the plane where the first clamping plate 211 is located is parallel to the plane where the second clamping plate 212 is located, the connecting rod 221 is moved so as to slide in the waist-shaped long hole of the support portion 213, thereby adjusting the relative positions of the connecting rod 221 and the elastic torsion member 222 and the clamping plate 21, thereby ensuring the flexibility of the first clamping plate 211 and the second clamping plate 212; when the position of the elastic torsion member 222 changes, the force points of the two ends of the elastic torsion member 222 on the first clamping plate 211 and the second clamping plate 212 change accordingly, thereby changing the magnitude and distribution of the clamping force.

[0054] The two stoppers 223 are fixed to the two ends of the connecting rod 221 , and after adjusting the positions of the connecting rod 221 and the elastic torsion member 222 , the stoppers 223 are tightened to make the two stoppers 223 respectively abut against the outer sides of the two supporting portions 213 of the first clamping plate 211 .

[0055] In the initial state, the plane where the first clamping plate 211 is located is intersecting with the plane where the second clamping plate 212 is located, and the clamping area of ​​the first clamping plate 211 maintains partial contact with the clamping area of ​​the second clamping plate 212; when the user applies external force to move the fixing area of ​​the second clamping plate 212, the second clamping plate 212 rotates around the connecting rod 221 by a certain angle, and at the same time, the second clamping plate 212 presses the elastic torsion member 222, so that the clamping area of ​​the second clamping plate 212 is separated from the clamping area of ​​the first clamping plate 211. At this time, the cable sample can be placed between the two clamping areas. After releasing the hand, under the action of the elastic torsion member 222, the second clamping plate 212 rotates and resets, thereby firmly clamping the cable sample to prevent the cable sample from falling off during the test; when clamping, the isolation pad 23 can play a buffering role between the clamping area of ​​the clamping plate 21 and the cable sample to prevent the clamping force of the clamping structure 20 from being too large, resulting in the breakage of the cable sample.

[0056] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Thermal extension test fixture, characterized in that: The invention comprises a test plate (10) and a clamping structure (20), wherein the clamping structure (20) is fixed on the test plate (10), and the clamping structure (20) comprises: Two clamping plates (21) arranged opposite to each other, the front ends of the two clamping plates (21) abutting against each other for clamping the cable sample, and a supporting portion (213) protruding from the clamping plates (21); A connecting assembly (22) is connected between the ends of the two clamps (21), and the connecting assembly (22) comprises a connecting rod (221) and an elastic torsion piece (222) sleeved on the connecting rod (221). The connecting rod (221) is connected to the supporting parts (213) of the two clamps (21) and can move toward or away from the front end of the clamps (21), and the two ends of the elastic torsion piece (222) respectively abut against the two clamps (21).

2. The thermal extension test fixture according to claim 1, characterized in that: The support portion (213) is provided with a waist-shaped long hole, and the connecting rod (221) is inserted into the waist-shaped long hole and can slide along the hole wall of the waist-shaped long hole.

3. The thermal extension test fixture according to claim 2, characterized in that: The connection assembly (22) further comprises two limiting members (223), the two limiting members (223) being respectively fixedly connected to two ends of the connection rod (221), and the limiting members (223) being capable of pressing against the support portion (213).

4. The thermal extension test fixture according to claim 3, characterized in that: The connecting assembly (22) further comprises an elastic gasket (224), wherein the elastic gasket (224) is sleeved on the connecting rod (221), and the elastic gasket (224) is located between the limiting member (223) and the supporting portion (213).

5. The thermal extension test fixture according to claim 1, characterized in that: The clamping plate (21) is provided with an isolation pad (23) for contacting the cable sample.

6. The thermal extension test fixture according to claim 5, characterized in that: The clamping plate (21) is provided with a groove, and the isolation pad (23) is at least partially embedded in the groove.

7. The thermal extension test fixture according to claim 1, characterized in that: The clamping plate (21) is T-shaped, and comprises: A fixing area, wherein the connecting component (22) is located between the fixing areas of the two clamping plates (21); The clamping area is connected to the end of the fixing area, and the clamping areas of the two clamping plates (21) are pressed against each other to clamp the cable sample.

8. The thermal extension test fixture according to any one of claims 1 to 7, characterized in that: The test plate (10) is provided with a handle (12).

9. The thermal extension test fixture according to any one of claims 1 to 7, characterized in that: The thermal extension test fixture further comprises a first fastener (30), a first mounting hole (11) is provided on the test plate (10), the first fastener (30) passes through one of the clamping plates (21) and an end portion is threadedly engaged with the first mounting hole (11).

10. The thermal extension test fixture according to claim 9, characterized in that: A plurality of the clamping structures (20) are arranged at intervals, and the first mounting holes (11) are arranged in a one-to-one correspondence with the clamping structures (20).

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