Fastening type torsion test device for cable

Abstract

The utility model discloses a fastening type torsion testing device used for a cable, comprising a rack and a testing machine, the testing machine comprises a fixed support plate, a translation plate, a motor, a load assembly and two groups of clamping assemblies, the two groups of clamping assemblies are respectively connected with the motor and the translation plate, the rack is provided with a guide rail, the translation plate is slidably connected with the guide rail, and the load assembly is connected with the fixed support plate. The load assembly is connected to the translation plate; the clamping assembly comprises a positioning shaft, a positioning plate, a clamping block and a locking nut, the positioning shaft is provided with a positioning hole, the locking nut is in threaded connection outside the positioning shaft, one side of the positioning shaft is provided with at least two clamping movable grooves, one end of the clamping block is provided with a limiting block, one side of the clamping block is provided with a driven wedge, and the locking nut is provided with a driving wedge; the driving wedge is used for driving all the driven wedges to move close to the positioning hole. According to the utility model, the test requirements of cables of different specifications can be effectively met, the firmness of cable clamping can be effectively improved, and the reliability of a torsion test can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cable test, especially a kind of fastening type torsion test device for cable. BACKGROUND

[0002] Cable is the general term of optical cable, cable and other articles, mainly for the effect of control installation, connect equipment, transmit power, such as network cable, electric wire etc.

[0003] The durability of cable is a kind of performance directly reflecting the quality of cable, in the production process of cable, the cable needs to be twisted for testing, to evaluate its mechanical properties and durability, especially for the network cable for transmitting data signal, its mechanical properties and durability are particularly obvious to the influence of data signal transmission.In the related art, the cable is usually twisted for testing by using simple clamping plate to clamp and fix the cable, and then the cable is twisted by motor or other rotating mechanism to drive the cable for testing, but the clamping structure of this kind of torsion test is unstable, and it is difficult to adapt to different specifications of cable, and the torsion test result is unreliable. SUMMARY

[0004] The utility model aims at at least one of the technical problems existing in prior art. To this end, the utility model provides a fastening type torsion test device for cable, which can stably clamp the cable to realize torsion test, the test result is reliable, and different cables can be adapted.

[0005] According to the fastening type torsion test device for cable provided by the utility model, the test machine is connected to the rack, the test machine includes fixed support plate, translation plate, motor, load assembly and two sets of clamping assemblies, the fixed support plate is connected to the rack, the motor is connected to the fixed support plate, the fixed parts of the two sets of clamping assemblies are connected to the motor and the translation plate respectively, the rack is provided with guide rail, the fixed support plate is located at one end outside the guide rail, the translation plate is slidingly connected to the guide rail, the load assembly is connected to the side of the translation plate away from the fixed support plate, so that the translation plate forms the movement trend of moving away from the fixed support plate;

[0006] The clamping assembly comprises a positioning shaft, a positioning plate, clamping blocks and a locking nut, the positioning shaft is provided with a positioning hole for threading a cable, the positioning plate is connected to one side of the positioning shaft, the positioning plate is a fixed part of the clamping assembly, the positioning plate is provided with a clearance hole matched with the positioning hole, the circumferential surface of the positioning shaft is provided with an external thread matched with the locking nut, the locking nut is threadedly connected to the positioning shaft, the side of the positioning shaft close to the positioning plate is provided with at least two clamping movable slots, all the clamping movable slots are uniformly distributed around the positioning hole, one end of each clamping movable slot is connected to the positioning hole, the other end of each clamping movable slot is provided with a limiting slot, the bottom of each clamping movable slot is provided with a wedge movable slot, the opening of the wedge movable slot is located on the side of the positioning shaft away from the positioning plate, the clamping block is slidingly connected to the clamping movable slot, one end of the clamping block is provided with a limiting block slidingly connected to the limiting slot, one side of the clamping block is provided with a driven wedge slidingly connected to the wedge movable slot, the side of the driven wedge away from the clamping block is provided with a driven inclined surface located outside the positioning shaft, the driven inclined surface is inclined away from the clamping block in the direction from the edge to the center of the positioning shaft, the locking nut is provided with a driving wedge located on the side of the positioning shaft away from the positioning plate, the driving wedge is in the shape of a ring, the inner wall of the driving wedge is provided with a driving inclined surface matched with the driven inclined surface, and the driving wedge is used to drive all the driven wedges to move close to the positioning hole.

[0007] In the embodiment, the side of each limiting block away from the clamping block is provided with a spring, and the opposite ends of the spring are connected to the limiting block and the slot wall of the limiting slot respectively, so that the limiting block has a movement trend away from the positioning hole.

[0008] In the embodiment, the clamping movable slot is provided with four.

[0009] In the embodiment, one end of each clamping block close to the positioning hole is provided with a plurality of first anti-skid lines.

[0010] In the embodiment, the side of the positioning shaft close to the positioning plate is provided with a threaded hole, the positioning plate is provided with a through hole corresponding to the threaded hole, and the clamping assembly further comprises a screw, which is threaded through the through hole and threadedly connected with the threaded hole.

[0011] In the embodiment, the circumferential surface of the locking nut is provided with a plurality of second anti-skid lines.

[0012] In the embodiment, the load assembly comprises a fixed pulley, a linkage rope and a load, the fixed pulley is rotationally connected to the rack, the opposite ends of the linkage rope are connected to the translation plate and the load respectively, and the linkage rope is wound outside the fixed pulley.

[0013] In the embodiment, the bottom of the translation plate is provided with a guide groove, and the guide rail is threaded in the guide groove.

[0014] In the embodiment, the testing machine is provided with two, the two testing machines are uniformly distributed on the rack, and the guide rail is provided with two.

[0015] The embodiments of this utility model have at least the following beneficial effects:

[0016] By using unique clamping components to clamp and position the cable at different locations, the stability of the clamping and positioning can be effectively improved. The cable is clamped by at least two sets of clamping blocks evenly distributed along a circumferential trajectory, which effectively improves the stability of the cable positioning effect. Combined with load components and a motor, it can simulate the stress conditions of the cable during actual use, effectively improving the reliability of the test results. By rotating the locking nut, the active wedge drives each driven wedge to move closer to the positioning hole, thereby driving each clamping block to move synchronously closer to the center of the positioning hole. This effectively improves the uniformity of the cable stress, effectively reducing the impact of uneven stress on cable clamping and damage during torsion tests, and effectively improving the torsion test performance. The targeted nature of the locking nut effectively improves the accuracy and reliability of cable torsion tests. Furthermore, adjusting the locking nut simultaneously drives the movement of all clamping blocks within the same clamping assembly, resulting in high locking and adjustment efficiency and ease of adjustment. This reduces the workload of operators and increases testing efficiency. The locking nut also allows for stepless adjustment of the clamping blocks, effectively adapting to the clamping requirements of different cable specifications and applying varying clamping forces to meet diverse testing needs, demonstrating strong versatility. Additionally, because the locking nut is threaded to the positioning shaft, the locking and positioning structure is stable and robust, effectively improving the stability of the cable clamped within the clamping assembly and enhancing the reliability of the torsion test. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a cable fastening torsion testing device according to an embodiment of the present invention;

[0019] Figure 2 This is a three-dimensional structural schematic diagram of the cable fastening torsion testing device according to an embodiment of the present invention, viewed from another perspective.

[0020] Figure 3 This is a top view of the cable fastening torsion test device according to an embodiment of the present invention;

[0021] Figure 4 In this embodiment of the utility model, when the clamping component is released, along Figure 3 A schematic diagram of the cross-sectional structure of line A-A';

[0022] Figure 5 In this embodiment of the utility model, when the clamping component is clamped, along Figure 3A-A' cross-sectional structure schematic diagram of the embodiment of the utility model;

[0023] Figure 6 It is the exploded structure schematic diagram of the clamping assembly in the fastening type torsion test device for cable of the embodiment of the utility model.

[0024] Reference signs:

[0025] Rack 1000, guide rail 1100;

[0026] Tester 2000, fixed support plate 2100, translation plate 2200, guide groove 2210, motor 2300, load assembly 2400, fixed pulley 2410, linkage rope 2420, load piece 2430, clamping assembly 2500, positioning shaft 2510, positioning hole 2511, clamping movable groove 2512, limiting groove 2513, inclined wedge movable groove 2514, screw hole 2515, positioning plate 2520, let go hole 2521, through hole 2522, clamping block 2530, limiting block 2531, driven inclined wedge 2532, driven inclined surface 2533, spring 2534, first anti-skid pattern 2535, locking nut 2540, driving inclined wedge 2541, driving inclined surface 2542, second anti-skid pattern 2543, screw 2550. DETAILED DESCRIPTION

[0027] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0028] In the description of the utility model, it needs to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, left, right, front, back and the like, is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0029] In the description of the utility model, if the line sleeve and the support are described, it is only for the purpose of distinguishing technical features, and therefore cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0031] Cable is a general term for optical cable, cable and the like, mainly used for control installation, connecting equipment, transmitting power and the like, such as network cable, wire and the like, network cable is used for connecting different equipment to realize communication between them. The durability of the cable is a kind of performance directly reflecting the quality of the cable. In the production process of the cable, the cable needs to be twisted for testing to evaluate its mechanical properties and durability, especially the network cable used for transmitting data signals, the mechanical properties and durability of which have a particularly obvious influence on data signal transmission. In the related art, the cable is usually clamped and fixed by using a simple clamping plate, and then the cable is twisted by a motor or the like to perform the test, but the clamping structure of such a twisting test is unstable, and it is difficult to adapt to different specifications of the cable, and the twisting test result is unreliable.

[0032] The existing twisting test device often relies on manual alignment and the like during the test process. This not only has low efficiency, but also has safety hazards. Especially when performing long-time and high-load twisting test, the stability and reliability of manual operation are difficult to guarantee, which further affects the accuracy of the test result. Therefore, it is of great significance to develop a test device capable of automatically, stably and accurately clamping and twisting the cable for improving the quality and safety of the cable product.

[0033] The following refers to the accompanying drawings that Figure 1 to the accompanying drawings that Figure 6 A fastening type twisting test device for cable is described in the embodiments of the utility model, which can stably clamp the cable to realize the twisting test, the test result is reliable, and different cables can be adapted.

[0034] Referring to Figures 1 to 6 A fastening type twisting test device for cable is described in the embodiments of the utility model, which can stably clamp the cable to realize the twisting test, the test result is reliable, and different cables can be adapted. The fastening type twisting test device for cable comprises a rack 1000 and a testing machine 2000, the testing machine 2000 is connected to the rack 1000, the testing machine 2000 comprises a fixed support plate 2100, a translation plate 2200, a motor 2300, a load assembly 2400 and two sets of clamping assemblies 2500, the fixed support plate 2100 is fixedly connected to the rack 1000, the motor 2300 is fixedly connected to the fixed support plate 2100, the fixed parts of the two sets of clamping assemblies 2500 are connected to the driving end of the motor 2300 and the translation plate 2200 respectively, the motor 2300 is used for driving the clamping assembly 2500 connected to the driving end to rotate, the rack 1000 is provided with a guide rail 1100, the fixed support plate 2100 is located outside one end of the guide rail 1100, the translation plate 2200 is slidingly connected to the guide rail 1100, the load assembly 2400 is connected to one side of the translation plate 2200 away from the fixed support plate 2100, so that the translation plate 2200 forms a movement trend away from the fixed support plate 2100;

[0035] The clamping assembly 2500 comprises a positioning shaft 2510, a positioning plate 2520, a clamping block 2530 and a locking nut 2540. The positioning shaft 2510 is provided with a positioning hole 2511 penetrating through two side faces for threading a cable. The axis of the positioning hole 2511 is collinear with the axis of the positioning shaft 2510, that is, the positioning hole 2511 extends along the axis direction of the positioning shaft 2510. The positioning plate 2520 is fixedly connected to one side of the positioning shaft 2510, that is, the positioning plate 2520 is fixedly connected to one end of the positioning shaft 2510. The positioning plate 2520 is a fixed part of the clamping assembly 2500. The positioning plate 2520 is provided with a clearance hole 2521 matched with the positioning hole 2511. The clearance hole 2521 is connected to one end of the positioning hole 2511. The circumferential face of the positioning shaft 2510 is provided with an external thread matched with the locking nut 2540. The locking nut 2540 is threadedly connected to the outside of the positioning shaft 2510. The inner wall of the locking nut 2540 is provided with an internal thread matched with the external thread. One side of the positioning shaft 2510 close to the positioning plate 2520 is provided with at least two clamping movable grooves 2512 extending along the radial direction of the positioning shaft 2510. The groove opening of the clamping movable groove 2512 penetrates through the end face of the positioning shaft 2510 close to the positioning plate 2520. All the clamping movable grooves 2512 are uniformly distributed around the positioning hole 2511. One end of each clamping movable groove 2512 is connected to one side of the positioning hole 2511, so that the clamping movable groove 2512 is communicated with the positioning hole 2511. The other end of each clamping movable groove 2512 is provided with a limiting groove 2513. The limiting groove 2513 is communicated with the clamping movable groove 2512. The width of the limiting groove 2513 is greater than that of the clamping movable groove 2512. The groove bottom of each clamping movable groove 2512 is provided with a wedge movable groove 2514. The wedge movable groove 2514 is communicated with the clamping movable groove 2512 and is isolated from the positioning hole 2511. The opening of the wedge movable groove 2514 is located on the side of the positioning shaft 2510 away from the positioning plate 2520. The clamping block 2530 is slidingly connected to the clamping movable groove 2512. The positioning plate 2520 is used for limiting the clamping block 2530 in the clamping movable groove 2512, so as to avoid that the clamping block 2530 completely separates from the clamping movable groove 2512. This not only can effectively improve the stability of the structure, but also can facilitate the assembly of the clamping assembly 2500. The end of the clamping block 2530 away from the positioning hole 2511 is provided with a limiting block 2531 slidingly connected in the limiting groove 2513. The limiting groove 2513 is used for limiting the radial position of the limiting block 2531 in the positioning shaft 2510, so as to effectively control the radial position of the clamping block 2530 in the positioning shaft 2510 and effectively ensure the reliability of the clamping action. The side of the clamping block 2530 away from the groove opening of the clamping movable groove 2512 is provided with a driven wedge 2532 slidingly connected in the wedge movable groove 2514. The clamping block 2530, the limiting block 2531 and the driven wedge 2532 are integrally formed.The side of the driven inclined wedge 2532 away from the clamping block 2530 is provided with a driven inclined surface 2533 outside the positioning shaft 2510, which is inclined away from the clamping block 2530 along the direction from the edge of the positioning shaft 2510 to the center of the positioning shaft 2510, and the locking nut 2540 is provided with a driving inclined wedge 2541 on the side of the positioning shaft 2510 away from the positioning plate 2520, which is in the form of a circular ring, and the inner wall of the driving inclined wedge 2541, i.e., the inner ring, is provided with a driving inclined surface 2542 matched with the driven inclined surface 2533, which is in the form of a continuous circular truncated cone inclined surface structure around the circular ring, which can simultaneously realize the steering and pushing effect of multiple driven inclined surfaces 2533, and the driving inclined wedge 2541 is used to drive all the driven inclined wedges 2532 to move along the radial direction of the positioning shaft 2510 to approach the positioning hole 2511, so as to clamp the cable clamped in the positioning hole 2511.

[0036] In operation, the ends of the cable are respectively clamped through the two positioning holes 2511 of the two clamping assemblies 2500, the locking nut 2540 is rotated to drive the driving inclined wedge 2541 to move along the radial direction of the positioning shaft 2510, under the guidance of the driving inclined surface 2542 and the driven inclined surface 2533 and the limiting action of the radially extending clamping movable groove 2512, the clamping block 2530 can only move along the radial direction of the positioning shaft 2510 in the clamping movable groove 2512, and under the driving action of the driving inclined wedge 2541, each clamping block 2530 moves along the radial direction of the positioning shaft 2510 to approach the center of the positioning hole 2511, so as to clamp the cable; after the two clamping assemblies 2500 clamp different parts of the cable respectively, under the action of the load assembly 2400, the cable is straightened, the motor 2300 drives the clamping assembly 2500 connected thereto to rotate, so as to drive the cable to realize torsion, and according to the number of times of adjusting the forward and reverse rotation of the motor 2300, the torsion test of the cable can be realized, so as to provide an experimental basis for judging the torsion durability of the cable. The structures of the clamping assembly 2500 before and after clamping are shown in Figure 4 and Figure 5

[0037] By setting the unique clamping assembly 2500 to clamp and position different positions of the cable, the firmness of clamping and positioning the cable can be effectively improved, the cable is clamped by at least two groups of clamping blocks 2530 uniformly distributed along the circumferential track, the stability of the positioning effect of the cable can be effectively improved, and the load assembly 2400 and the motor 2300 can simulate the stress condition of the cable in actual use, so as to effectively improve the reliability of the test result.

[0038] ​The driven inclined wedge 2532 is driven to move close to the positioning hole 2511 by the driving inclined wedge 2541 through the rotation of the locking nut 2540, and then each clamping block 2530 is driven to move close to the center of the positioning hole 2511, which can effectively improve the uniformity of the force received by the cable, effectively reduce the influence of the broken cable caused by uneven force on the realization of the torsion test of the cable, significantly weaken the adverse effects caused by clamping the cable, effectively improve the pertinence of the torsion test, and then effectively improve the accuracy and reliability of the cable torsion test. Moreover, adjusting the locking nut 2540 can simultaneously drive all the clamping blocks 2530 in the same clamping assembly 2500 to move, and the locking and adjusting operation is efficient and convenient, which can reduce the working strength of the operator and improve the test efficiency. Moreover, the clamping blocks 2530 are adjusted by the locking nut 2540, which can effectively adapt to the clamping requirements of clamping cables of different specifications, and can form different clamping forces on the cable to adapt to different test requirements, and has high versatility.

[0039] In addition, since the locking nut 2540 is connected to the positioning shaft 2510 by the threaded connection, the locking and positioning structure is stable and firm, and can still maintain a stable structure under the action of the tension of the load assembly 2400 and the torsion force formed by the motor 2300. Therefore, the firmness of the position of the cable clamped in the clamping assembly 2500 can be effectively improved, and the reliability of the torsion test can be effectively improved.

[0040] It can be understood that each limiting block 2531 is provided with a spring 2534 away from the clamping block 2530, and the opposite ends of each spring 2534 are connected to the limiting block 2531 and the groove wall of the limiting groove 2513, respectively, so that the limiting block 2531 forms a movement trend away from the positioning hole 2511, i.e. the spring 2534 is a tensile spring 2534 for allowing the limiting block 2531 to form a movement trend away from the positioning hole 2511.

[0041] After completing the torsion test, the locking nut 2540 outside the positioning shaft 2510 is loosened, and under the action of the spring 2534, the clamping block can loosen the clamping of the cable, which can effectively improve the efficiency of installing and dismounting the cable.

[0042] It can be understood that the clamping movable groove 2512 is provided with four clamping movable grooves 2512, which are uniformly distributed around the positioning hole 2511, and the limiting groove 2513, the inclined wedge movable groove 2514, the clamping block 2530, the limiting block 2531, the driven inclined wedge 2532 and the spring 2534 are each provided with four, which can effectively improve the reliability of the clamping and positioning effect on the cable.

[0043] It can be understood that each clamping block 2530 is provided with a plurality of first anti-skid lines 2535 near the center of the positioning hole 2511, and the first anti-skid lines 2535 can effectively improve the clamping and positioning effect of the clamping block 2530 on the cable.

[0044] It can be understood that the positioning shaft 2510 is provided with a threaded hole 2515 near one side of the positioning plate 2520, the positioning plate 2520 is provided with a through hole 2522 corresponding to the threaded hole 2515, and the clamping assembly 2500 further comprises a screw 2550, the screw 2550 is threaded through the through hole 2522 and is screwed with the threaded hole 2515, preferably, the threaded hole 2515, the through hole 2522 and the screw 2550 are provided with four, the positions of the four through holes 2522 correspond to the positions of the four threaded holes 2515, and the positioning plate 2520 is fixed to one end of the positioning shaft 2510 by four screws 2550 threaded through the four through holes 2522 and the four threaded holes 2515, so that the clamping assembly 2500 is convenient to assemble and connect, and the connection structure is stable and reliable.

[0045] It can be understood that the outer circumferential surface of the locking nut 2540 is provided with a plurality of second anti-skid lines 2543, the extension direction of the second anti-skid lines 2543 is parallel to the positioning shaft 2510, and the second anti-skid lines 2543 can effectively increase the friction force during the rotation adjustment of the locking nut 2540, thereby effectively improving the reliability of the locking adjustment operation, and the adjustment operation is convenient.

[0046] It can be understood that the load assembly 2400 comprises a fixed pulley 2410, a linkage rope 2420 and a load 2430, the fixed pulley 2410 is rotatably connected to the rack 1000, the fixed pulley 2410 is located on the side of the translation plate 2200 away from the fixed support plate 2100, the opposite ends of the linkage rope 2420 are connected to the translation plate 2200 and the load 2430 respectively, and the linkage rope 2420 is wound outside the fixed pulley 2410.

[0047] The conventional torsion test device often lacks precise control mechanism when applying load, so that the load changes unevenly during the test process, and the stress condition of the cable in actual use cannot be accurately simulated. The load 2430 is arranged in the tight torsion test device for cable of the utility model, and under the action of gravity, the translation plate 2200 is pulled away from the fixed support plate 2100 through the linkage rope 2420, so as to simulate the stress condition in actual use, and the accuracy of the torsion test can be effectively improved. Preferably, weights can be placed on the load 2430 to adapt to the load demand of different torsion tests.

[0048] It can be understood that the bottom of the translation plate 2200 is provided with a guide groove 2210, and the guide rail 1100 is arranged in the guide groove 2210. The guide rail 1100 can limit the sliding track of the translation plate 2200.

[0049] Specifically, the bottom of the translation plate 2200 is provided with two guide grooves 2210, and the rack 1000 is provided with two guide rails 1100, and the two guide rails 1100 are arranged in the two guide grooves 2210 respectively, which can effectively improve the stability of the sliding action of the translation plate 2200 relative to the rack 1000. Preferably, the cross section of the guide rail 1100 is dovetail-shaped, and the guide groove 2210 is a dovetail groove.

[0050] It can be understood that the testing machine 2000 is provided with two, and the two testing machines 2000 are evenly distributed on the rack 1000. According to the actual use requirement, the two testing machines 2000 can be used to simultaneously perform the torsion test on two cables, which can effectively improve the test efficiency. The guide rail 1100 is provided with two, and the guide rail 1100 is used to connect the two testing machines 2000 respectively.

[0051] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A fastening torsion testing device for cables, characterized in that, The device includes a frame (1000) and a testing machine (2000), the testing machine (2000) being connected to the frame (1000). The testing machine (2000) includes a fixed support plate (2100), a translation plate (2200), a motor (2300), a load assembly (2400), and two sets of clamping assemblies (2500). The fixed support plate (2100) is connected to the frame (1000), the motor (2300) is connected to the fixed support plate (2100), and the two sets of clamping assemblies (2500) have fixed portions. The frame (1000) is provided with a guide rail (1100) and a fixed support plate (2100) located outside one end of the guide rail (1100). The translation plate (2200) is slidably connected to the guide rail (1100). The load assembly (2400) is connected to the side of the translation plate (2200) away from the fixed support plate (2100) so that the translation plate (2200) forms a movement tendency away from the fixed support plate (2100). The clamping assembly (2500) includes a positioning shaft (2510), a positioning plate (2520), a clamping block (2530), and a locking nut (2540). The positioning shaft (2510) has a positioning hole (2511) for threading a cable. The positioning plate (2520) is connected to one side of the positioning shaft (2510) and serves as the fixing part of the clamping assembly (2500). The positioning plate (2520) has a clearance hole (2521) that matches the positioning hole (2511). The circumferential surface of the positioning shaft (2510) has an outer surface that matches the locking nut (2540). The locking nut (2540) is threaded onto the outside of the positioning shaft (2510). The positioning shaft (2510) has at least two clamping grooves (2512) on the side near the positioning plate (2520). All the clamping grooves (2512) are evenly distributed around the positioning hole (2511). One end of each clamping groove (2512) is connected to the positioning hole (2511), and the other end of each clamping groove (2512) has a limiting groove (2513). The bottom of each clamping groove (2512) has a wedge-shaped movable groove (2514). The opening of the movable groove (2514) is located on the side of the positioning shaft (2510) away from the positioning plate (2520). The clamping block (2530) is slidably connected to the clamping movable groove (2512). One end of the clamping block (2530) is provided with a limiting block (2531) slidably connected to the limiting groove (2513). One side of the clamping block (2530) is provided with a driven wedge (2532) slidably connected to the wedge movable groove (2514). The driven wedge (2532) away from the clamping block (2530) is provided with a driven inclined surface (25) located outside the positioning shaft (2510). 33) The driven inclined surface (2533) is inclined away from the clamping block (2530) along the direction from the edge of the positioning shaft (2510) to the center. The locking nut (2540) is provided with an active wedge (2541) located on the side of the positioning shaft (2510) away from the positioning plate (2520). The active wedge (2541) is annular. The inner wall of the active wedge (2541) is provided with an active inclined surface (2542) that matches the driven inclined surface (2533). The active wedge (2541) is used to drive all the driven wedges (2532) to move closer to the positioning hole (2511).

2. The fastening torsion testing device for cables according to claim 1, characterized in that, Each of the limiting blocks (2531) is provided with a spring (2534) on the side away from the clamping block (2530). The opposite ends of the spring (2534) are respectively connected to the wall of the limiting block (2531) and the limiting groove (2513) so that the limiting block (2531) forms a movement tendency to move away from the positioning hole (2511).

3. A fastening torsion testing device for cables according to claim 2, characterized in that, The clamping slots (2512) are provided in four places.

4. A fastening torsion testing device for cables according to claim 1, characterized in that, Each of the clamping blocks (2530) has a plurality of first anti-slip textures (2535) at one end near the positioning hole (2511).

5. A fastening torsion testing device for cables according to claim 1, characterized in that, The positioning shaft (2510) has a screw hole (2515) on the side near the positioning plate (2520). The positioning plate (2520) has a through hole (2522) corresponding to the screw hole (2515). The clamping assembly (2500) also includes a screw (2550), which passes through the through hole (2522) and is threadedly connected to the screw hole (2515).

6. A fastening torsion testing device for cables according to claim 1, characterized in that, The circumferential surface of the locking nut (2540) is provided with a number of second anti-slip grooves (2543).

7. A fastening torsion testing device for cables according to claim 1, characterized in that, The load assembly (2400) includes a fixed pulley (2410), a linkage rope (2420), and a load member (2430). The fixed pulley (2410) is rotatably connected to the frame (1000). The two ends of the linkage rope (2420) are respectively connected to the translation plate (2200) and the load member (2430). The linkage rope (2420) is wound around the fixed pulley (2410).

8. A fastening torsion testing device for cables according to claim 1, characterized in that, The bottom of the translation plate (2200) is provided with a guide groove (2210), and the guide rail (1100) passes through the guide groove (2210).

9. A fastening torsion testing device for cables according to claim 1, characterized in that, Two testing machines (2000) are provided, and the two testing machines (2000) are evenly distributed on the frame (1000). Two guide rails (1100) are provided.

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