A steel wire rope tensile strength detection device

Abstract

This invention relates to the field of strength testing devices, specifically to a wire rope tensile strength testing device, comprising a frame, a front pulley, a rear pulley, and two clamping mechanisms. The front and rear pulleys are both mounted on the frame, and the two clamping mechanisms are respectively mounted on the front and rear pulleys. Each clamping mechanism includes a first clamp and a second clamp. The first clamp can move closer to or further away from the second clamp. A jaw for clamping the wire rope is defined between the first and second clamps. The jaw includes an inlet section, an outlet section, and multiple V-shaped bends. This wire rope tensile strength testing device, by setting jaws with V-shaped bends, allows the transition between the crests and troughs to simultaneously clamp the wire rope, avoiding uneven clamping force caused by premature clamping at one point and improving clamping stability.

Description

Technical Field

[0001] This invention relates to the field of strength testing devices, and specifically to a device for testing the tensile strength of steel wire ropes. Background Technology

[0002] Braided wire rope is made by twisting wires into strands and then braiding the strands into a rope. The braiding process gives it anti-torsion properties, making it widely used as a traction rope and guide rope. During use, wire ropes need to withstand tensile, bending, and torsional loads through actions such as laying, traction, and winding equipment to meet construction requirements. Therefore, it is crucial to regularly test the tensile strength of wire ropes.

[0003] The wire rope tensile testing machine is a key component of the wire rope testing module. The tensile testing machine mainly consists of a frame, a front trolley, a rear trolley, a clamping mechanism, and a tensile mechanism (main hydraulic cylinder, connecting rod, and front top beam, etc.). During the tensile test, the wire rope is fixed between the front and rear trolleys by the clamping mechanism. The piston rod of the main hydraulic cylinder pushes the front top beam, which in turn drives the connecting rod to move the front trolley forward, thereby completing the tensile test.

[0004] In her master's thesis, "Dynamic Simulation and Structural Optimization of Clamping and Tensile Mechanism of Wire Rope Tensile Testing Machine," published in *Jinan University* on May 23, 2022, Gu Weilin pointed out that in order to increase the contact area between the jaws and the wire rope to achieve a stable clamping, the jaws along the wire rope axis were designed as a sinusoidal curve (see Chapter 2 for details). However, this jaw design resulted in a decrease in the contact area between the jaws and the wire rope, specifically manifested as a continuous reduction in the normal phase distance of the jaws during the transition between peaks and troughs, leading to a decrease in the clamping area of ​​the wire rope. The wire rope initially clamps and generates significant compressive force near the transition section of the jaws at the tension end. However, the troughs of the moving and fixed jaw curves cannot contact the wire rope, preventing effective clamping. This reduces the contact area between the jaws and the wire rope, increasing localized stress and ultimately causing wire breakage and crushing failure to occur first near the transition section of the jaws at the tension end during the wire rope tensile test. A force-enhancing clamping mechanism was further designed (see Chapter 3). This mechanism, consisting of a pull rod, rocker arm, rotating jaws, and fixed jaws, improves the uniformity of clamping force. However, the improved force-enhancing clamping mechanism uses a parallel, linear clamping method, meaning its clamping area is only affected by length and cannot increase the clamping area within a limited length. Summary of the Invention

[0005] This invention provides a wire rope tensile strength testing device to solve the problem that existing clamping mechanisms cannot increase the contact area between the jaws and the wire rope to achieve stable clamping.

[0006] The present invention provides a wire rope tensile strength testing device with the following technical solution: A wire rope tensile strength testing device for testing the tensile strength of a wire rope includes a frame, a front pulley, a rear pulley, and two clamping mechanisms. The front pulley and the rear pulley are sequentially arranged on the frame along a first direction, and can move closer to or further away from each other along the first direction, which is horizontal. The two clamping mechanisms are respectively installed on the front pulley and the rear pulley, and can clamp both ends of the wire rope respectively. The clamping mechanism includes a first clamp and a second clamp, which are located on the front pulley. Alternatively, the first clamp can be arranged in parallel along the second direction on the rear trolley. The first clamp can move closer to or further away from the second clamp along the second direction, which is horizontal and perpendicular to the first direction. A jaw for clamping the wire rope is defined between the first clamp and the second clamp. The jaw includes an inlet section, an outlet section, and multiple V-shaped broken line segments. The inlet section, multiple V-shaped broken line segments, and the outlet section are arranged sequentially and interconnected in the first direction. The inlet section and the outlet section are both straight structures. The multiple V-shaped broken line segments are wavy. Multiple grooves are provided on both the first clamp and the second clamp. The multiple grooves are located at the crests and troughs of the multiple V-shaped broken line segments, respectively.

[0007] Furthermore, the cross-section of the jaws perpendicular to the first direction is a figure-eight shape, narrow at the top and wide at the bottom.

[0008] Furthermore, the surface of the first fixture facing the second fixture along the second direction is called the first surface, and the upper and lower bottom edges of the first surface are parallel; the surface of the second fixture facing the first fixture along the second direction is called the second surface, and the upper and lower bottom edges of the second surface are parallel, and the upper bottom edge of the first surface is parallel to the upper bottom edge of the second surface, and the lower bottom edge of the first surface is parallel to the lower bottom edge of the second surface.

[0009] Furthermore, the second clamp includes multiple clamping bodies, which are sequentially arranged on the front or rear trolley along a first direction. Each clamping body is slidably mounted on the front or rear trolley via a first elastic member, which is arranged along a second direction.

[0010] Furthermore, the first elastic element is a rectangular spring, and the number of coils is set to one.

[0011] Furthermore, both the front and rear trolleys are fixedly equipped with fixing plates, and each clamping body is mounted on the fixing plate via a first elastic element.

[0012] Furthermore, both the front and rear trolleys are provided with multiple sliding grooves, which are arranged along the second direction; each clamping body is provided with a slider, which is arranged in a one-to-one correspondence with the sliding groove, and the slider is slidably installed in the corresponding sliding groove.

[0013] Furthermore, a wire rope tensile strength testing device also includes a tensioning mechanism, which is located on the side of the front trolley away from the rear trolley in a first direction. The tensioning mechanism includes a first hydraulic cylinder, a connecting rod, and a movable frame. The first hydraulic cylinder is mounted on the frame, the movable frame is slidably mounted on the frame and fixedly mounted on the output end of the first hydraulic cylinder, and the connecting rod is arranged along the first direction, with both ends of the connecting rod connected to the movable frame and the front trolley, respectively.

[0014] Furthermore, a positioning plate is fixedly installed on the frame, one end of the connecting rod is connected to the movable frame, and the other end passes through the positioning plate and is connected to the front trolley.

[0015] Furthermore, a second hydraulic cylinder is provided on both the front and rear trolleys, and the first clamp is installed at the output end of the corresponding second hydraulic cylinder.

[0016] The beneficial effects of this invention are as follows: The wire rope tensile strength testing device of this invention, by setting jaws with V-shaped zigzag segments, increases the clamping area within a limited length. Simultaneously, the V-shaped zigzag segments ensure that the distance between the jaws remains equal during the transition from crest to trough during the movement of the first clamp, thereby enabling synchronous clamping of the wire rope at the transition point between the crest and trough. This avoids uneven clamping force caused by premature clamping at one point, improving clamping stability. Furthermore, by setting grooves at the crest and trough, no additional clamping force is applied at the bending position of the wire rope, avoiding excessive alternating loads at the bending position. This reduces the probability of breakage during tensile strength testing, improving the accuracy of the test results.

[0017] Furthermore, by setting the cross-section of the jaws perpendicular to the first direction to a figure-eight shape that is narrower at the top and wider at the bottom, the wire rope will move downwards under the influence of the first and second surfaces as the first clamp moves towards the side closer to the second clamp along the second direction. This ensures that the wire rope is finally positioned at the bottom of the first and second clamps, guaranteeing that the wire rope is in a straight axial position within the jaws and preventing local bending of the wire rope, which would affect the subsequent tensile strength test results.

[0018] Furthermore, by setting multiple clamping bodies, the rectangular spring is fully compressed during normal clamping, resulting in rigid clamping. However, once the diameter of the wire rope shrinks at the end of the jaws (mainly the inlet section and the V-shaped zigzag section near the inlet section), the rectangular spring is released, allowing the clamping body at that location to move towards the first clamping fixture, thus maintaining effective clamping of the wire rope. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the wire rope tensile strength testing device of the present invention; Figure 2 for Figure 1 Enlarged view at point X; Figure 3 This is a schematic diagram of a partial structure of an embodiment of a wire rope tensile strength testing device according to the present invention; Figure 4 for Figure 3 Side view of the structure shown; Figure 5 for Figure 4 A cross-sectional view along the YY direction; Figure 6 for Figure 5 Enlarged view at point Z; Figure 7 This is a schematic diagram of the front pulley and clamping mechanism of an embodiment of a wire rope tensile strength testing device of the present invention; Figure 8 This is a structurally exploded view of the front pulley and clamping mechanism of an embodiment of a wire rope tensile strength testing device of the present invention.

[0021] In the diagram: 100, wire rope; 200, frame; 210, cover plate; 300, front trolley; 310, fixed plate; 320, chute; 400, rear trolley; 500, clamping mechanism; 510, first clamp; 520, second clamp; 521, second surface; 522, clamping body; 523, first elastic element; 530, jaws; 531, inlet section; 532, outlet section; 533, V-shaped zigzag section; 540, groove; 550, second hydraulic cylinder; 610, first hydraulic cylinder; 620, connecting rod; 630, movable frame; 640, positioning plate. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] An embodiment of the wire rope tensile strength testing device of the present invention, such as... Figures 1 to 8 As shown.

[0024] A wire rope tensile strength testing device is provided for testing the tensile strength of a wire rope 100. The device includes a frame 200, a front pulley 300, a rear pulley 400, and two clamping mechanisms 500. The front pulley 300 and rear pulley 400 are sequentially arranged on the frame 200 along a first direction, and can move closer to or further away from each other along the first direction, which is horizontal. The two clamping mechanisms 500 are respectively mounted on the front pulley 300 and the rear pulley 400, and can clamp both ends of the wire rope 100 respectively. Multiple cover plates 210 are rotatably mounted on the frame 200. During testing, the cover plates 210 are closed to prevent the wire rope 100 from breaking and flying out.

[0025] The clamping mechanism 500 includes a first clamp 510 and a second clamp 520, which are arranged side-by-side on the front trolley 300 or the rear trolley 400 along a second direction. The first clamp 510 can move closer to or further away from the second clamp 520 along the second direction, which is horizontal and perpendicular to the first direction. A jaw 530 for clamping the wire rope 100 is defined between the first clamp 510 and the second clamp 520. The jaw 530 includes an inlet section 531, an outlet section 532, and a plurality of V-shaped bends 533. The inlet section 531, the plurality of V-shaped bends 533, and the outlet section 532 are arranged sequentially and interconnected in the first direction. Both the inlet section 531 and the outlet section 532 are straight structures, and the multiple V-shaped broken line segments 533 are wavy. The first clamp 510 and the second clamp 520 are provided with multiple grooves 540. The multiple grooves 540 are located at the crests and troughs of the multiple V-shaped broken line segments 533, and the grooves 540 are located on the side of the first clamp 510 and the second clamp 520 near the bending point of the wire rope 100 under tension.

[0026] One of the wire rope tensile strength testing devices further includes a tensioning mechanism. The tensioning mechanism is located on the side of the front trolley 300 away from the rear trolley 400 in a first direction. The tensioning mechanism includes a first hydraulic cylinder 610, a connecting rod 620, and a movable frame 630. The first hydraulic cylinder 610 is fixedly mounted on the frame 200, and the movable frame 630 is slidably mounted on the frame 200 and fixedly mounted at the output end of the first hydraulic cylinder 610. The connecting rod 620 is arranged along the first direction, and its two ends are connected to the movable frame 630 and the front trolley 300, respectively.

[0027] Furthermore, a positioning plate 640 is fixedly installed on the frame 200. One end of the connecting rod 620 is connected to the movable frame 630, and the other end passes through the positioning plate 640 and is connected to the front trolley 300. The positioning plate 640 is used to install and position the connecting rod 620.

[0028] When in use, the first hydraulic cylinder 610 is activated. The activation of the first hydraulic cylinder 610 will drive the movable frame 630 to move along the first direction. The movement of the movable frame 630 will push the front trolley 300 to move closer to or further away from the rear trolley 400 through the connecting rod 620, so as to realize the movement of the front trolley 300 and the rear trolley 400 closer or further away in the first direction.

[0029] Both the front trolley 300 and the rear trolley 400 are equipped with second hydraulic cylinders 550, and the first clamp 510 is mounted on the output end of the corresponding second hydraulic cylinder 550. By setting the second hydraulic cylinder 550, the first clamp 510 can move closer to or further away from the second clamp 520 in a second direction.

[0030] This embodiment, by setting jaws 530 with V-shaped zigzag segments 533, allows the wire rope 100 to be fed in from the inlet section 531 during use. The wire rope 100 is then passed through multiple V-shaped zigzag segments 533 sequentially and exited from the outlet section 532. The first clamp 510 is then driven to move along a second direction towards the side closer to the second clamp 520, gradually clamping the wire rope 100. This increases the clamping area within a limited length, while the V-shaped zigzag segments 533 ensure that the distance between the jaws 530 remains equal during the transition from crest to trough as the first clamp 510 moves. That is, see [link to relevant documentation]. Figure 6 As shown in the figure, A1B1=A2B2; B1C1=B2C2, which allows the steel wire rope 100 to be clamped synchronously at the transition between the crest and trough, avoiding uneven clamping force caused by premature clamping at a certain point, and improving the stability of clamping.

[0031] Furthermore, for the wire rope 100 (bent portion) located near the crest or trough of the inlet section 531, if the wire rope 100 at this location is clamped, it will be subjected to bending stress in addition to tension. During the tensile strength test, the wire rope 100 on the inlet section 531 side will gradually become thinner. If the wire rope 100 (bent portion) located near the crest or trough of the inlet section 531 breaks during the test, it will be impossible to determine whether the wire rope 100 broke due to tension, thus affecting the test results. Therefore, this embodiment provides grooves 540 at the crests and troughs to avoid applying additional clamping force at the bending position of the wire rope 100, preventing excessive alternating loads at the bending position of the wire rope 100, reducing the probability of breakage during the tensile strength test, and improving the accuracy of the test results. It should be noted that although not clamping the curved part sacrifices some effective clamping area to some extent, the total clamping area of ​​multiple V-shaped segments 533 is still relatively large compared to the straight clamping method, given a limited length.

[0032] In a further embodiment, the jaw 530 has a cross-section perpendicular to the first direction that is narrow at the top and wide at the bottom, forming a figure-eight shape.

[0033] The surface of the first clamp 510 facing the second clamp 520 along the second direction is referred to as the first surface, and the upper and lower bottom edges of the first surface are parallel. The surface of the second clamp 520 facing the first clamp 510 along the second direction is referred to as the second surface 521, and the upper and lower bottom edges of the second surface 521 are parallel. The upper bottom edge of the first surface is parallel to the upper bottom edge of the second surface 521, and the lower bottom edge of the first surface is parallel to the lower bottom edge of the second surface 521.

[0034] See Figure 7 As shown, by setting the cross-section of the jaws 530 perpendicular to the first direction to a V-shape with a narrow top and a wide bottom, the wire rope 100 will move downwards under the influence of the first and second surfaces 521 as the first clamp 510 moves towards the side closer to the second clamp 520 along the second direction. This ensures that the wire rope 100 is finally positioned at the bottom of the first clamp 510 and the second clamp 520. (See [reference]). Figure 4 As shown, this ensures that the wire rope 100 is in a straight axial position within the jaws 530, preventing local axial bending of the wire rope 100 and affecting the subsequent tensile test results.

[0035] Furthermore, the upper bottom edge of the first surface and the lower bottom plate are parallel, the upper bottom edge of the second surface 521 and the lower bottom edge of the second surface 521 are parallel, and the upper bottom edge of the first surface and the upper bottom edge of the second surface 521 are parallel, so that after the wire rope 100 is clamped, any two sides of the first surface and the second surface 521 are parallel, and so that after the wire rope 100 is clamped, during the movement of the first clamp 510, the distance between the jaws 530 is always equal when the wave crest transitions to the wave trough.

[0036] In a further embodiment, the second clamp 520 includes a plurality of clamping bodies 522, which are sequentially arranged on the front trolley 300 or the rear trolley 400 along a first direction. Each clamping body 522 is slidably mounted on the front trolley 300 or the rear trolley 400 via a first elastic member 523. The first elastic member 523 is arranged along a second direction and is a rectangular spring with one coil.

[0037] Among them, the front trolley 300 and the rear trolley 400 are both fixedly provided with a fixing plate 310, and each clamping body 522 is installed on the fixing plate 310 through a first elastic member 523.

[0038] Specifically, both the front trolley 300 and the rear trolley 400 are provided with multiple sliding grooves 320, which are arranged along the second direction. Each clamping body 522 is provided with a slider, which is arranged in a one-to-one correspondence with the sliding groove 320, and the slider is slidably installed in the corresponding sliding groove 320.

[0039] In this embodiment, the second clamp 520 is configured as multiple clamping bodies 522. During use, the wire rope 100 is fed in from the inlet section 531 and sequentially passes through multiple V-shaped zigzag segments 533 before exiting from the outlet section 532. Then, the second hydraulic cylinder 550 is activated to drive the first clamp 510 to move along a second direction towards the side closer to the second clamp 520. As the first clamp 510 moves, the multiple clamping bodies 522 gradually approach the fixed plate 310 and compress the rectangular spring, causing the rectangular spring to deform under force until the multiple clamping bodies 522 can no longer move towards the fixed plate 310. Then, the second hydraulic cylinder 550 extends further until the clamping of the wire rope 100 is complete.

[0040] After clamping, the first hydraulic cylinder 610 is activated to stretch the wire rope 100. During the stretching process, the diameter of a section of the wire rope 100 near the inlet section 531 will decrease under the action of the tension. At this time, the clamping body 522 corresponding to this position will be slightly displaced away from the fixed plate 310 under the action of the rectangular spring corresponding to it, and move towards the side closer to the first clamp 510 to adapt to the size change of the wire rope 100 and maintain the relative uniformity of clamping.

[0041] That is, during normal clamping, the rectangular spring is fully compressed, resulting in rigid clamping. However, once the diameter of the wire rope 100 contracts at the end of the jaws 530 (mainly the inlet section 531 and the V-shaped zigzag section 533 near the inlet section 531), the rectangular spring releases, allowing the clamping body 522 at that location to move towards the first clamp 510, maintaining effective clamping of the wire rope 100. Furthermore, during use, the dimensions of the clamping body 522 corresponding to the inlet section 531 and the V-shaped zigzag section 533 near the inlet section 531 can be adjusted in the first direction according to the diameter and material of the wire rope 100, allowing the clamping body 522 to better adapt to changes in the size of the wire rope 100.

[0042] Based on the above embodiments, the specific working process is as follows: In use, the wire rope 100 is fed in from the inlet section 531 and then passed through multiple V-shaped zigzag sections 533 in sequence before being sent out from the outlet section 532. Then, the second hydraulic cylinder 550 is activated to drive the first clamp 510 to move along the second direction toward the side closer to the second clamp 520.

[0043] As the first clamp 510 moves towards the side closer to the second clamp 520 along the second direction, the wire rope 100 will move downward under the influence of the first surface and the second surface 521, so that the wire rope 100 is finally at the bottom position of the first clamp 510 and the second clamp 520. See [reference needed]. Figure 4 As shown, this ensures that the wire rope 100 is in a straight axial position within the jaws 530, preventing local axial bending of the wire rope 100 and affecting the subsequent tensile test results.

[0044] As the first clamp 510 moves, the multiple clamping bodies 522 gradually approach the fixed plate 310 and compress the rectangular spring, causing the rectangular spring to deform under force until the multiple clamping bodies 522 can no longer move towards the fixed plate 310. Then, the second hydraulic cylinder 550 extends further until the wire rope 100 is clamped. While increasing the clamping area within a limited length, the V-shaped zigzag segment 533 ensures that the distance between the jaws 530 remains equal during the transition from crest to trough as the first clamp 510 moves. That is, see [link to relevant documentation]. Figure 6 As shown in the figure, A1B1=A2B2; B1C1=B2C2, which allows the steel wire rope 100 to be clamped synchronously at the transition between the crest and trough, avoiding uneven clamping force caused by premature clamping at a certain point, and improving the stability of clamping.

[0045] Furthermore, for the wire rope 100 (bent portion) located near the crest or trough of the inlet section 531, if the wire rope 100 at this location is clamped, it will be subjected to bending stress in addition to tension. During the tensile strength test, the wire rope 100 on the inlet section 531 side will gradually become thinner. If the wire rope 100 (bent portion) located near the crest or trough of the inlet section 531 breaks during the test, it will be impossible to determine whether the wire rope 100 broke due to tension, thus affecting the test results. Therefore, this embodiment provides grooves 540 at the crests and troughs to avoid applying additional clamping force at the bending position of the wire rope 100, preventing excessive alternating loads at the bending position of the wire rope 100, reducing the probability of breakage during the tensile strength test, and improving the accuracy of the test results. It should be noted that although not clamping the curved part sacrifices some effective clamping area to some extent, the total clamping area of ​​multiple V-shaped segments 533 is still relatively large compared to the straight clamping method, given a limited length.

[0046] After clamping, the first hydraulic cylinder 610 is activated to stretch the wire rope 100. During the stretching process, the diameter of a section of the wire rope 100 near the inlet section 531 will decrease under the action of the tension. At this time, the clamping body 522 corresponding to this position will be slightly displaced away from the fixed plate 310 under the action of the rectangular spring corresponding to it, and move towards the side closer to the first clamp 510 to adapt to the size change of the wire rope 100 and maintain the relative uniformity of clamping.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the tensile strength of steel wire rope, used to test the tensile strength of steel wire rope, characterized in that: The device includes a frame, a front trolley, a rear trolley, and two clamping mechanisms. The front and rear trolleys are sequentially arranged on the frame along a first direction, and can move closer to or further away from each other along the first direction, which is horizontal. The two clamping mechanisms are respectively mounted on the front and rear trolleys, and can clamp both ends of the wire rope. Each clamping mechanism includes a first clamp and a second clamp, which are arranged side-by-side on the front or rear trolley along a second direction. The first clamp can move closer to or further away from each other along the second direction. Or away from the second clamp, the second direction is horizontal and perpendicular to the first direction; a jaw for clamping the wire rope is defined between the first clamp and the second clamp, the jaw includes an inlet section, an outlet section and multiple V-shaped broken line segments, the inlet section, multiple V-shaped broken line segments and the outlet section are arranged sequentially in the first direction and are interconnected; the inlet section and the outlet section are both straight structures, the multiple V-shaped broken line segments are wavy, and multiple grooves are provided on both the first clamp and the second clamp, the multiple grooves are respectively located at the crests and troughs of the multiple V-shaped broken line segments.

2. The wire rope tensile strength testing device according to claim 1, characterized in that: The jaws have a cross-section perpendicular to the first direction that is narrow at the top and wide at the bottom, forming a figure-eight shape.

3. The wire rope tensile strength testing device according to claim 2, characterized in that: The surface of the first fixture facing the second fixture along the second direction is called the first surface, and the upper and lower bottom edges of the first surface are parallel. The surface of the second fixture facing the first fixture along the second direction is called the second surface, and the upper and lower bottom edges of the second surface are parallel. The upper bottom edge of the first surface is parallel to the upper bottom edge of the second surface, and the lower bottom edge of the first surface is parallel to the lower bottom edge of the second surface.

4. The wire rope tensile strength testing device according to claim 1, characterized in that: The second clamp includes multiple clamping bodies, which are sequentially arranged on a front or rear trolley along a first direction. Each clamping body is slidably mounted on the front or rear trolley via a first elastic member, which is arranged along a second direction.

5. The wire rope tensile strength testing device according to claim 4, characterized in that: The first elastic element is a rectangular spring, and the number of coils is set to one.

6. The wire rope tensile strength testing device according to claim 4, characterized in that: Both the front and rear trolleys are fixedly equipped with fixing plates, and each clamping body is mounted on the fixing plate through a first elastic element.

7. The wire rope tensile strength testing device according to claim 4, characterized in that: Both the front and rear trolleys are provided with multiple sliding grooves, which are arranged along the second direction; each clamping body is provided with a slider, which is arranged in a one-to-one correspondence with the sliding groove, and the slider is slidably installed in the corresponding sliding groove.

8. The wire rope tensile strength testing device according to claim 1, characterized in that: It also includes a tensioning mechanism, which is located on the side of the front trolley away from the rear trolley in the first direction. The tensioning mechanism includes a first hydraulic cylinder, a connecting rod, and a movable frame. The first hydraulic cylinder is mounted on the frame, the movable frame is slidably mounted on the frame and fixedly mounted on the output end of the first hydraulic cylinder, and the connecting rod is arranged along the first direction. The two ends of the connecting rod are respectively connected to the movable frame and the front trolley.

9. The wire rope tensile strength testing device according to claim 8, characterized in that: A positioning plate is fixedly installed on the frame. One end of the connecting rod is connected to the movable frame, and the other end passes through the positioning plate and is connected to the front trolley.

10. The wire rope tensile strength testing device according to claim 1, characterized in that: Both the front and rear trolleys are equipped with a second hydraulic cylinder, and the first clamp is installed at the output end of the corresponding second hydraulic cylinder.

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