A wear resistance detection device for load-bearing cables

Abstract

The present invention relates to the field of testing technology, and specifically to a load-bearing cable wear resistance detection device, comprising a base and a support frame fixed on the base, one end of the rope to be detected is connected to the support frame, and the other end is connected to a counterweight block, a detection rod is provided on the base, one end of the detection rod is provided with a friction block, the friction block is used to press and cooperate with the rope to be detected, the friction block is used to rub the rope to be detected along the length direction of the rope to be detected, and the detection rod is movably arranged on the base so that the detection rod can rotate around the rope to be detected, and then the friction block can rub the rope to be detected along the outer circumference. The present invention can perform more comprehensive detection of the circumference of the rope to be detected and improve the detection effect.

Description

Technical Field

[0001] The invention relates to the field of testing technology, and in particular to a device for detecting the wear resistance of a load-bearing cable. Background Art

[0002] Since ropes will wear against other objects during use, if the rope's wear resistance is not enough, it will easily break due to wear during use. Therefore, a special wear resistance testing device is needed to test the rope's wear resistance to ensure that the rope meets the use requirements.

[0003] The rope wear resistance testing equipment in the prior art continuously rubs the rope back and forth along the length direction of the rope when testing the rope, and observes the degree of wear of the rope after rubbing the set frequency. However, this testing method in the prior art can only perform friction testing on the same side of the rope circumference, and the testing effect is poor. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a wear resistance detection device for a load-bearing cable to solve the technical problem that the prior art can only perform friction detection on the same position of the rope circumference and has poor detection effect.

[0005] A wear resistance detection device for a load-bearing cable of the present invention adopts the following technical solution:

[0006] A load-bearing rope wear resistance detection device comprises a base and a support frame fixed on the base, one end of the rope to be detected is connected to the support frame, and the other end is connected to a counterweight block, a detection rod is provided on the base, one end of the detection rod is provided with a friction block, the friction block is used to press fit with the rope to be detected, the friction block is used to rub the rope to be detected along the length direction of the rope to be detected, and the detection rod is movably arranged on the base so that the detection rod can rotate around the rope to be detected, thereby enabling the friction block to rub the rope to be detected along the outer circumference of the rope to be detected.

[0007] Furthermore, a planetary gear mechanism is provided on the base, and the detection rod is arranged on the base through the planetary gear mechanism, and the planetary gear mechanism includes an inner ring gear, a sun gear, a planetary carrier and a planetary gear, the inner ring gear is fixed on the base, and a rotating shaft is rotatably installed on the base, and the axis of the rotating shaft extends in the up and down directions, and the rotating shaft is connected to a driving device, the sun gear is installed on the rotating shaft and can rotate synchronously with the rotating shaft, the planetary carrier is connected to the rotating shaft and can rotate synchronously with the rotating shaft, the planetary gear is rotatably installed on the planetary carrier, and is meshed with the inner ring gear and the sun gear at the same time, and the central axes of the planetary gears, sun gear and inner ring gear all extend in the up and down directions, one end of the detection rod is connected to the planetary gear, and when the planetary gear rotates along the circumference of the sun gear and around its own axis, it drives the detection rod to rotate circumferentially along the rope to be detected.

[0008] Furthermore, the center of the planetary gear has an inner hole, the axis of the inner hole extends in the up and down directions, a thread groove is opened on the side wall of the inner hole, a slider is provided on the outer wall of one end of the detection rod, one end of the detection rod with the slider is inserted into the inner hole, the slider is located in the thread groove and can slide back and forth up and down along the thread groove, when the planetary gear rotates along the circumference of the sun gear and around its own axis, the detection rod rotates around the rope to be detected and the slider slides back and forth up and down along the thread groove, so that the detection rod moves up and down, thereby realizing the movement of the friction block along the length direction of the rope to be detected to rub it.

[0009] Furthermore, the planetary carrier includes a crossbeam extending in the horizontal direction, one end of the crossbeam is fixedly connected to the rotating shaft, and the other end is fixed with a fixed shaft whose axis extends in the up-down direction, the fixed shaft is passed through the inner hole of the planetary gear, and a center hole is opened at one end of the detection rod inserted in the inner hole of the planetary gear, and the upper end of the fixed shaft is passed through the center hole.

[0010] Furthermore, the fixed shaft passes through the upper and lower sides of the cross beam, and a roller is installed at the lower end of the fixed shaft, and the roller is supported on a base.

[0011] Furthermore, the detection rod is L-shaped, including a vertical rod extending in the up-down direction and a cross rod connected to the top of the vertical rod, the lower end of the vertical rod is inserted into the inner hole of the planetary gear, and the friction block is fixed to the end of the cross rod away from the vertical rod.

[0012] Furthermore, one end of the horizontal rod away from the vertical rod is connected to a hollow tube, the axis of the hollow tube is arranged parallel to the vertical rod, and the rope to be detected is inserted into the hollow tube.

[0013] Furthermore, an annular slot is provided on the counterweight block, and the lower end of the hollow cylinder is guided and inserted into the annular slot. The lower end of the rope to be detected is located in the hollow cylinder and connected to the upper side of the counterweight block. A spring is provided in the annular slot, and the upper end of the spring is connected to the lower end of the hollow cylinder, and the lower end is connected to the bottom of the annular slot.

[0014] Furthermore, the driving device is fixed on the lower side of the base, the output shaft of the driving device extends in the up-down direction, and the output shaft of the driving device is coaxially connected with the rotating shaft through a coupling.

[0015] Furthermore, the support frame is a gantry support, including two columns and a horizontal beam connected between the two columns, a hook is fixed in the middle of the horizontal beam, and the hook is used to be fixedly connected to one end of the rope to be detected.

[0016] The beneficial effects of the present invention are as follows: a load-bearing rope wear resistance detection device of the present invention, by movably setting the detection rod on the base, enables the detection rod to rotate around the rope to be detected, so that when the friction block repeatedly rubs along the length direction of the rope to be detected, the friction block can also rub the rope to be detected along the outer periphery at the same time, which can simulate the actual use of the rope, thereby increasing the friction surface between the outer periphery of the rope to be detected and the friction block, and improving the detection effect.

[0017] Furthermore, the detection rod of the present invention is arranged on the base through a planetary gear, and the planetary gear mechanism is used to drive the detection rod to rotate around the rope to be detected. In addition, a thread groove and a slider are arranged between one end of the detection rod and the planetary gear of the planetary gear mechanism, and the rotation of the planetary gear is used to drive the detection rod to rotate around the rope to be detected and to move up and down at the same time. During the process of moving the rope up and down, the friction block rubs the rope along the length direction of the rope to be detected, and at the same time, the friction block rotates along the circumference of the rope to be detected, and rubs different positions on the outer circumference of the rope to be detected.

[0018] Furthermore, the present invention arranges a hollow cylinder outside the rope to be detected, and the counterweight block connected to the lower end of the rope to be detected cooperates with the lower end guide of the hollow cylinder, and a spring is arranged between the two. During the lifting and lowering movement of the detection rod, the lifting and lowering of the friction block will pull the rope to be detected up and down, so that the counterweight block at the lower end of the rope to be detected moves back and forth up and down. When the friction block descends, the hollow cylinder descends synchronously, which will compress the spring between the hollow cylinder and the counterweight block, and then apply a downward elastic force to the rope to be detected, so that the rope to be detected maintains the tension, reduces the change in the tension of the rope to be detected during the up and down movement of the counterweight block, and then reduces the change in friction between the friction block and the rope to be detected, thereby improving the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0020] Figure 1 It is a three-dimensional schematic diagram of an embodiment of a wear resistance detection device for a load-bearing cable of the present invention;

[0021] Figure 2 It is a cross-sectional view of an embodiment of a wear resistance detection device for a catenary cable of the present invention;

[0022] Figure 3 for Figure 2 A magnified view of the part A in the middle;

[0023] Figure 4 It is a schematic diagram of a detection rod in one embodiment of a wear resistance detection device for a load-bearing cable of the present invention;

[0024] Figure 5 A schematic diagram of a planetary gear in an embodiment of a device for detecting wear resistance of a catenary cable according to the present invention;

[0025] In the figure: 100, support frame; 200, horizontal beam; 201, hook; 300, rope; 301, hollow cylinder; 302, counterweight; 3021, annular slot; 303, spring; 400, column; 500, inner ring; 600, base; 700, planetary gear; 701, fixed shaft; 702, threaded groove; 7011, key block; 800, sun gear; 801, rotating shaft; 900, detection rod; 901, center hole; 902, friction block; 903, slider; 904, mounting seat; 1000, driving device; 1001, coupling; 1100, planetary carrier; 1200, roller. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] An embodiment of a wear resistance detection device for a load-bearing cable of the present invention is as follows: Figures 1 to 5As shown, the wear resistance detection device of the load-bearing cable includes a base 600 and a support frame 100 fixed on the base 600. When the rope 300 to be detected is subjected to friction detection, one end of the rope 300 to be detected is connected to the support frame 100, and the other end is connected to a counterweight 302. The base 600 is also provided with a detection rod 900, and one end of the detection rod 900 is provided with a friction block 902. In this embodiment, the friction block 902 is a wedge-shaped block, one end of the wedge-shaped block is a tip, and the tip is facing one side to support the rope 300 to be detected. The friction block 902 is used to press and fit with the rope 300 to be detected. The friction block 902 is used to rub the rope 300 to be detected along the length direction of the rope 300 to be detected. The detection rod 900 can rotate around the rope 300 to be detected, so that the friction block 902 can rub the rope 300 to be detected along the outer periphery of the rope 300 to be detected.

[0028] In this embodiment, the detection rod 900 is arranged on the base 600 through a planetary gear mechanism, so that the detection rod 900 can rotate around the rope 300 to be detected. In this embodiment, the base 600 includes a circular disk and a leg fixed to the bottom of the circular disk, and the planetary gear mechanism is arranged on the circular disk of the base 600. The planetary gear mechanism includes an inner gear ring 500, a sun gear 800, a planet carrier 1100 and a planetary gear 700. The inner gear ring 500 is fixed on the circular disk of the base 600 and arranged coaxially with the circular disk. A rotating shaft 801 is rotatably installed at the center position of the circular disk of the base 600, and the axis of the rotating shaft 801 extends in the up-down direction. The rotating shaft 801 is connected to a driving device 1000. In this embodiment, the driving device 1000 is a driving motor, and the driving motor is fixed to the lower side of the circular disk of the base 600. The output shaft of the driving motor is coaxially arranged with the rotating shaft 801, and the two are connected by a coupling 1001. The sun gear 800 is installed on the rotating shaft 801 from top to bottom and can rotate synchronously with the rotating shaft 801. The planet carrier 1100 is connected to the rotating shaft 801 and can rotate synchronously with the rotating shaft 801. In this embodiment, the planet carrier 1100 includes a beam extending in the horizontal direction, one end of the beam is fixedly connected to the rotating shaft 801, and the other end is fixed with a fixed shaft 701 whose axis extends in the vertical direction. The planetary gear 700 is rotatably installed on the fixed shaft 701 of the planet carrier 1100, and the planetary gear 700 is meshed with the inner gear ring 500 and the sun gear 800 at the same time. When the driving motor drives the rotating shaft 801 to rotate, the sun gear 800 rotates synchronously with the rotating shaft 801, and at the same time, the sun gear 800 drives the planetary gear 700 to rotate between the inner gear ring 500 and the sun gear 800 along the circumference of the sun gear 800, and the planetary gear 700 rotates around its own axis, that is, the planetary gear 700 rotates and revolves around the sun gear 800.

[0029] One end of the detection rod 900 is coaxially connected to the planetary gear 700. When the planetary gear 700 rotates circumferentially along the sun gear 800 and around its own axis, it drives the detection rod 900 to rotate circumferentially along the rope 300 to be detected, thereby enabling the friction block 902 on the detection rod 900 to rub the rope 300 to be detected along its outer periphery.

[0030] In this embodiment, the central axes of the planetary gear 700, the sun gear 800 and the inner gear ring 500 all extend in the up-down direction. The detection rod 900 is L-shaped, including a vertical rod extending in the up-down direction and a horizontal rod connected to the top of the vertical rod. The friction block 902 is fixed to the end of the horizontal rod away from the vertical rod. In this embodiment, a mounting seat 904 is provided at one end of the horizontal rod. The mounting seat 904 is provided with a through hole, and the friction block 902 is fixed to the mounting seat 904 by a fastening screw. The center of the planetary gear 700 has an inner hole with an axis extending in the up-down direction. The fixed shaft 701 on the crossbeam is penetrated in the inner hole of the planetary gear 700, and the lower end of the vertical rod is inserted into the inner hole of the planetary gear 700.

[0031] In this embodiment, when the planetary gear 700 drives the detection rod 900 to rotate around the sun gear 800, the detection rod 900 can move up and down relative to the planetary gear 700, that is, the detection rod 900 can move up and down while rotating in the circumferential direction. Specifically, the detection rod 900 is inserted into one end of the inner hole of the planetary gear 700, that is, the lower end of the vertical rod is provided with a center hole 901, and the upper end of the fixed shaft 701 is rotatably penetrated in the center hole 901, that is, the vertical rod of the detection rod 900 is inserted into the inner hole of the planetary gear 700, and is rotatably sleeved on the periphery of the fixed shaft 701. A thread groove 702 is provided on the side wall of the inner hole of the planetary gear 700, and a slider 903 is provided on the outer wall of the lower end of the vertical rod of the detection rod 900, and the slider 903 is located in the thread groove 702 and can slide back and forth along the thread groove 702. When the planetary gear 700 rotates along the circumference of the sun gear 800 and rotates around its own axis, the detection rod 900 rotates around the rope 300 to be detected, and at the same time, due to the self-rotation of the planetary gear 700, the slider 903 on the detection rod 900 can slide along the thread groove 702. Specifically, when the driving motor rotates in the forward direction, the rotating shaft 801 drives the planetary gear 700 to rotate in the forward direction of the sun gear 800, and at the same time, it rotates in the reverse direction. At this time, the detection rod 900 moves upward, that is, the detection rod 900 rises. When the driving motor rotates in the reverse direction, the rotating shaft 801 drives the planetary gear 700 to rotate in the reverse direction of the sun gear 800, and at the same time, it rotates in the forward direction. At this time, the detection rod 900 moves downward, that is, the detection rod 900 descends, that is, through the forward and reverse reciprocating rotation of the rotating shaft 801, the detection rod 900 can be reciprocated up and down, thereby realizing the reciprocating movement of the friction block 902 along the length direction of the rope 300 to be detected, thereby rubbing the rope 300 to be detected. It should be noted that a key block 7011 is provided on the outer side of the fixed shaft 701, and a key slot extending in the up-down direction is provided on the inner wall of the central hole 901 of the detection rod 900, and the key block 7011 is inserted in the key slot, so that the detection rod 900 and the fixed shaft 701 are prevented from rotating. In other embodiments, the key block 7011 and the key slot may not be provided, and due to the top pressure friction cooperation between the friction block 902 and the rope 300 to be detected, the detection rod 900 will not rotate, and the friction cooperation between the friction block 902 and the rope 300 to be detected can be maintained at all times.

[0032] In this embodiment, the end of the horizontal bar away from the vertical bar is connected with a hollow cylinder 301, the axis of the hollow cylinder 301 is arranged parallel to the vertical bar, that is, the axis of the hollow cylinder 301 extends in the up-down direction, the upper end of the hollow cylinder 301 is fixedly connected to the end of the horizontal bar away from the vertical bar through a connecting plate, and the rope 300 to be detected is inserted into the hollow cylinder 301. The counterweight block 302 connected to the lower end of the rope 300 to be detected is provided with an annular slot 3021, the lower end of the hollow cylinder 301 is guided and inserted into the annular slot 3021, the lower end of the rope 300 to be detected is located in the hollow cylinder 301 and connected to the upper side of the counterweight block 302, and a spring 303 is arranged in the annular slot 3021, the upper end of the spring 303 is connected to the lower end of the hollow cylinder 301, and the lower end is connected to the bottom of the annular slot 3021. During the lifting and lowering of the detection rod 900, the lifting and lowering of the friction block 902 will pull the rope 300 to be detected up and down, so that the counterweight block 302 at the lower end of the rope 300 to be detected moves up and down. When the friction block 902 descends, the hollow cylinder 301 descends synchronously, which will compress the spring 303 between the hollow cylinder 301 and the counterweight block 302, and then apply a downward elastic force to the rope 300 to be detected, so that the rope 300 to be detected maintains tension, reduces the change in tension of the rope 300 to be detected during the upward and downward movement of the counterweight block 302, and then reduces the change in friction between the friction block 902 and the rope 300 to be detected, thereby improving the detection effect.

[0033] In this embodiment, in order to keep the detection rod 900 rotating stably around the rope 300 to be detected, the fixed shaft 701 passes through the upper and lower sides of the beam, and a roller 1200 is installed at the lower end of the fixed shaft 701, and the roller 1200 is supported on the base 600.

[0034] In this embodiment, the support frame 100 is a gantry support, including two columns 400 and a horizontal beam 200 connected between the two columns 400. A hook 201 is fixed in the middle of the horizontal beam 200, and the hook 201 is used to be fixedly connected with one end of the rope 300 to be detected. In addition, the hook 201 is arranged just above the center of the sun gear 800, and the friction block 902 is eccentrically arranged relative to the sun gear 800, that is, the friction block 902 deviates from the center of the sun gear 800, so that the friction block 902 can support the rope 300 to be detected toward one side, so that there is sufficient extrusion force between the rope 300 to be detected and the friction block 902, so as to ensure that the friction force between the friction block 902 and the rope 300 to be detected is large enough.

[0035] When the load-bearing cable wear resistance detection device of the present invention is used, first, one end of the rope 300 to be detected is tied to the hook 201, and the other end is tied to the upper side of the counterweight block 302. The friction block 902 fixed at one end of the detection rod 900 pushes the rope 300 to be detected toward one side, so that the rope 300 to be detected is bent in the middle to form two sections with different angles, one of which extends obliquely and the other extends vertically. Then, the driving device 1000 is started, and the driving device 1000 is first rotated in the forward direction, and the rotating shaft 801 and the sun gear 800 rotate forward synchronously with the output shaft of the driving device 1000. The sun gear 800 rotates, so that the planetary gear 700 revolves in the positive direction and rotates in the reverse direction between the inner gear ring 500 and the sun gear 800. The support between the friction block 902 and the rope 300 to be tested cooperates to limit the detection rod 900 from rotating. Therefore, the detection rod 900 will rotate relative to the planetary gear 700. Therefore, under the action of the thread groove 702 and the slider 903, the detection rod 900 moves up and down, so that the detection rod 900 can rotate around the rope 300 to be tested and move up and down, thereby performing a full range of wear resistance tests on the rope 300 to be tested as much as possible. Since the friction block 902 will compress the spring 303 between the hollow cylinder 301 and the counterweight block 302 when moving downward, the spring 303 will apply elastic force to the rope 300 to be tested after being compressed, thereby alleviating the reduction of friction pressure between the friction block 902 and the rope 300 caused by the reduction of the tension of the rope 300, and ensuring the stability of the friction strength as much as possible.

[0036] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the wear resistance of a load-bearing cable, comprising a base (600) and a support frame (100) fixed on the base (600), one end of a rope (300) to be tested is connected to the support frame (100), and the other end is connected to a counterweight (302), characterized in that: The base (600) is provided with a detection rod (900), one end of the detection rod (900) is provided with a friction block (902), the friction block (902) is used to press and match with the rope (300) to be detected, the friction block (902) is used to rub the rope (300) to be detected along the length direction of the rope (300) to be detected, the detection rod (900) is movably arranged on the base (600), so that the detection rod (900) can rotate around the rope (300) to be detected, thereby enabling the friction block (902) to rub the rope (300) to be detected along the periphery thereof, the base (600) is provided with a planetary gear mechanism, the detection rod (900) is moved by the movement of the detection rod (900) The planetary gear mechanism is arranged on a base (600), the planetary gear mechanism comprising an inner gear ring (500), a sun gear (800), a planet carrier (1100) and a planetary gear (700); the inner gear ring (500) is fixed on the base (600); a rotating shaft (801) is rotatably mounted on the base (600); the axis of the rotating shaft (801) extends in the up-down direction; the rotating shaft (801) is connected to a driving device (1000); the sun gear (800) is mounted on the rotating shaft (801) and can rotate synchronously with the rotating shaft (801); the planet carrier (1100) is connected to the rotating shaft (801) and can rotate synchronously with the rotating shaft (801); The planetary gear (700) is rotatably mounted on the planet carrier (1100) and meshes with the inner gear ring (500) and the sun gear (800) at the same time. The central axes of the planetary gear (700), the sun gear (800) and the inner gear ring (500) all extend in the up-down direction. One end of the detection rod (900) is connected to the planetary gear (700). When the planetary gear (700) rotates in the circumferential direction of the sun gear (800) and around its own axis, it drives the detection rod (900) to rotate in the circumferential direction of the rope (300) to be detected. The center of the planetary gear (700) has an inner hole, the axis of the inner hole extends in the up-down direction, and a thread groove (700) is provided on the side wall of the inner hole. 2) A slider (903) is provided on the outer wall of one end of the detection rod (900); one end of the detection rod (900) provided with the slider (903) is inserted into the inner hole; the slider (903) is located in the thread groove (702) and can slide reciprocatingly up and down along the thread groove (702); when the planetary gear (700) rotates along the circumference of the sun gear (800) and around its own axis, the detection rod (900) rotates around the rope (300) to be detected and the slider (903) slides reciprocatingly up and down along the thread groove (702), so that the detection rod (900) moves up and down, thereby realizing that the friction block (902) moves along the length direction of the rope (300) to be detected to rub it;The planet carrier (1100) comprises a horizontal beam extending in the horizontal direction, one end of the horizontal beam is fixedly connected to the rotating shaft (801), and the other end is fixed with a fixed shaft (701) whose axis extends in the vertical direction, and the fixed shaft (701) is inserted into the inner hole of the planetary gear (700), and one end of the detection rod (900) inserted into the inner hole of the planetary gear (700) is provided with a center hole (901), and the upper end of the fixed shaft (701) is inserted into the center hole (901); the fixed shaft (701) passes through the upper and lower sides of the horizontal beam, and the fixed shaft (701) 1) is provided with a roller (1200) at the lower end, and the roller (1200) is supported on the base (600); the detection rod (900) is L-shaped, and comprises a vertical rod extending in the up-down direction and a horizontal rod connected to the top of the vertical rod, the lower end of the vertical rod is inserted into the inner hole of the planetary gear (700), and the friction block (902) is fixed to the end of the horizontal rod away from the vertical rod; the end of the horizontal rod away from the vertical rod is connected to a hollow cylinder (301), the axis of the hollow cylinder (301) is arranged parallel to the vertical rod, and the rope (300) to be detected is inserted into the hollow cylinder (301). ; 2. The wear resistance detection device for a Messenger cable according to claim 1, characterized in that: An annular slot (3021) is provided on the counterweight (302), the lower end of the hollow cylinder (301) is inserted into the annular slot (3021), the lower end of the rope (300) to be detected is located in the hollow cylinder (301) and connected to the upper side of the counterweight (302), a spring (303) is provided in the annular slot (3021), the upper end of the spring (303) is connected to the lower end of the hollow cylinder (301), and the lower end is connected to the bottom of the annular slot (3021).

3. The wear resistance detection device for a Messenger cable according to claim 2, characterized in that: The driving device (1000) is fixed on the lower side of the base (600), the output shaft of the driving device (1000) extends in the up-down direction, and the output shaft of the driving device (1000) is coaxially connected to the rotating shaft (801) via a coupling (1001).

4. The wear resistance detection device for a Messenger cable according to any one of claims 1 to 3, characterized in that: The support frame (100) is a gantry support, comprising two columns (400) and a horizontal beam (200) connected between the two columns (400), a hook (201) being fixed in the middle of the horizontal beam (200), and the hook (201) being used for being fixedly connected to one end of a rope (300) to be detected.

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