A clamping device for cable strength detection

Abstract

The present invention relates to the field of cable detection, and discloses a clamping device for cable strength detection, which includes a support frame. A first hydraulic rod is arranged on the support frame, and a first gear is installed on the outer wall of the first hydraulic rod. A first clamping device is arranged on the support frame, and a rotation following device is arranged at the bottom end of the first hydraulic rod. A second clamping device is arranged inside the rotation following device. A first cable for clamping is arranged on the first clamping device and the second clamping device. A torsion locking device is connected to the first clamping device and the second clamping device; in the present invention, a clamping block is arranged on a transmission member inside the first clamping device, which can clamp the outer wall of the first cable and the metal wires on the first cable, so as to improve the detection of the force on the outer wall of the first cable and the force on the metal wires inside the first cable. Moreover, a plurality of circular ring sliders and circular ring protrusions clamp the outer wall and the metal wires of the first cable, increasing the clamping area and reducing the error caused by the deformation of the first cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cable detection, and more specifically, it relates to a clamping device for cable strength detection. Background Art

[0002] With the development of the power grid, more and more electricity is used, and the use of cables is also gradually increasing. Since cables need to adapt to different working environments, after production and manufacturing, it is necessary to detect their strength, mainly including testing voltage withstand performance, mechanical performance, and aging test.

[0003] The mechanical performance test of the cable mainly tests its tensile resistance, compression ability, and impact strength. Generally, the mechanical performance is tested by setting a fixture on a hydraulic press and clamping the cable with the fixture for strength detection, so as to detect the strength of the cable. However, when clamping the cable with the fixture, since the force-bearing area of the fixture clamping the cable is small, during the detection, the outer skin of the cable is easily torn, and the internal tensile condition of the cable cannot be detected. Moreover, the metal wires inside the cable can only be subjected to separate tensile and torsional tests, which is rather troublesome. Summary of the Invention

[0004] The present invention provides a clamping device for cable strength detection, which solves the technical problem that when clamping a power cable of 10 kV and above with a fixture in the related art, since the force-bearing area of the fixture clamping the cable is small, during the detection, the outer skin of the cable is easily torn, and the internal tensile condition of the cable cannot be detected. Moreover, the metal wires inside the cable can only be subjected to separate tensile and torsional tests.

[0005] The present invention provides a clamping device for cable strength detection, which includes a support frame. A first hydraulic rod is arranged on the support frame, and a first gear is installed on the outer wall of the first hydraulic rod. A first clamping device is arranged on the support frame. A rotation following device is arranged at the bottom end of the first hydraulic rod, and a second clamping device is arranged inside the rotation following device. A first cable for clamping is arranged on the first clamping device and the second clamping device. A torsion locking device is connected to the first clamping device and the second clamping device. When the first cable is twisted, the torsion locking device enables the first clamping device and the second clamping device to further clamp the first cable. The first clamping device includes a transmission member, a limiting member, a clamping block, and a tightening member. The transmission member is arranged at the center of the support frame. Two clamping blocks are arranged on the transmission member. The two clamping blocks respectively clamp the outer wall and the metal wire of the cable. The clamping block is connected with the limiting member and the tightening member. The limiting member is used to drive the clamping block to clamp the cable when the transmission member rises. The tightening member is used to drive the torsion locking device to rotate to prevent displacement between the cable and the clamping block when the rotation following device rotates. The second clamping device and the first clamping device are used to clamp both ends of the cable, and the tensile and torsion tests are carried out by the contraction and rotation of the first hydraulic rod away from each other.

[0006] As a further optimized solution of the present invention, the transmission member includes a second hydraulic rod fixedly installed on the support frame. The top end of the second hydraulic rod is fixedly installed with a lifting frame. The top end of the lifting frame is fixedly installed with a lifting block. A first locking block and a second locking block are arranged on the lifting block. A clamping block is arranged inside the first locking block and the second locking block. The clamping block inside the first locking block is used to clamp the metal wire of the cable, and the clamping block inside the second locking block is used to clamp the outer wall of the cable.

[0007] As a further optimized solution of the present invention, the limiting member includes a limiting ring rotatably installed on the support frame and concentric with the first locking block. Fixed columns are circumferentially arranged at the top end of the limiting ring. The fixed columns are connected with the clamping block and are used to limit the clamping block when the first locking block moves up and down.

[0008] As a further optimized solution of the present invention, the clamping block includes a plurality of circular ring sliders sliding inside the first locking block and the second locking block. The lifting blocks are in contact with each other to form a circular ring. Circular ring protrusions are arranged on the circular ring sliders. When the first locking block and the second locking block rise, the circular ring protrusions drive the circular ring sliders and the circular ring protrusions to approach the center of the support frame for clamping the cable and the metal wire.

[0009] As a further optimized solution of the present invention, the tightening member includes a first tightening column fixedly installed at the top of the clamping block inside the first locking block. A tightening ring is slidably installed at the top of the first tightening column. A tightening groove is provided inside the tightening ring and meshes with the tightening ring. Tightening grooves are provided at both the top and bottom of the tightening ring. A second tightening column is slidably arranged inside the tightening groove at the top. The top of the second tightening column is connected to the clamping block inside the second locking block. The second tightening column and the first tightening column are arranged alternately.

[0010] As a further optimized solution of the present invention, the first clamping device includes a blocking member arranged on the outer wall of the fixed column. The blocking member includes a fixed block fixedly installed on the outer wall of the fixed column. A first spring is fixedly connected to the fixed block. A blocking block is fixedly installed at the end of the first spring. The blocking block is used to limit the bottom end and the top end of the cable metal wire.

[0011] As a further optimized solution of the present invention, the torsion locking device includes an I-shaped fixing plate fixedly installed on the support frame. A second gear and a third gear are rotatably installed on the I-shaped fixing plate. The second gear is fixedly installed on the outer wall of the tightening ring. The third gear meshes with the second gear. A second spring is fixedly installed at the top of the third gear. A telescopic rod is fixedly installed at the top of the second spring. A third gear that meshes with the second clamping device is arranged on the outer wall of the telescopic rod.

[0012] As a further optimized solution of the present invention, the rotation following device includes a following block fixedly installed at the bottom end of the first hydraulic rod. A rotating ring is rotatably installed at the bottom end of the following block. A limiting column is fixedly installed at the bottom end of the rotating ring. A limiting block is fixedly installed at the bottom end of the limiting column. The inside of the limiting block is rotatably connected to the top end of the telescopic rod for limiting the telescopic rod.

[0013] As a further optimized solution of the present invention, the second clamping device is symmetrically arranged with the first clamping device. The second clamping device is installed inside the following block. The rotation of the following block is used to drive the second clamping device to rotate synchronously.

[0014] As a further optimized solution of the present invention, the first hydraulic rod is concentric with the following block and the limiting ring.

[0015] The beneficial effects of the present invention are as follows:

[0016] A clamping device for cable strength detection according to the present invention is provided with clamping blocks on the transmission members inside the first clamping device, which can clamp the outer wall of the first cable and the metal wires on the first cable, so as to improve the detection of the force on the outer wall of the first cable and the force on the metal wires inside the first cable. Multiple circular ring sliders and circular ring protrusions are used to clamp the outer wall of the first cable and the metal wires, increasing the clamping area and reducing the error caused by the deformation of the first cable. At the same time, a torsion locking device is connected to the first clamping device and the second clamping device. When twisting the first cable, the first cable is further clamped simultaneously to prevent the problem that the first cable deviates from the clamping block during twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the external installation drawing of the clamping device of the present invention;

[0018] Figure 2 is the separation drawing of the clamping device of the present invention;

[0019] Figure 3 is the overall drawing of the clamping device of the present invention;

[0020] Figure 4 is the internal structure drawing of the first clamping device of the present invention;

[0021] Figure 5 is the internal structure drawing of the tightening member of the present invention;

[0022] Figure 6 is the internal structure drawing of the transmission member of the present invention;

[0023] Figure 7 is the connection drawing of the rotation following device and the torsion locking device of the present invention.

[0024] In the figure:

[0025] 1. Support frame; 11. First gear; 12. First hydraulic rod; 13. First cable;

[0026] 2. First clamping device; 21. Transmission member; 211. Second hydraulic rod; 212. Lifting frame; 213. Lifting block; 214. First locking block; 215. Second locking block; 22. Limiting member; 221. Limiting ring; 222. Fixed column; 23. Clamping block; 231. Circular ring slider; 232. Circular ring protrusion; 24. Tightening member; 241. First tightening column; 242. Tightening ring; 243. Tightening groove; 244. Second tightening column; 25. Partition member; 251. Fixed block; 252. Partition block; 253. First spring;

[0027] 3. Torsion locking device; 31. Second gear; 32. I-shaped fixing plate; 33. Third gear; 34. Second spring; 35. Telescopic rod;

[0028] 4. Second clamping device

[0029] 5. Rotation following device; 51. Following block; 52. Rotation ring; 53. Limit post; 54. Limit block Detailed implementation manners

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples

[0031] As Figures 1 to 2 shown, a clamping appliance for cable strength detection according to an embodiment of the present invention includes a support frame 1. A first hydraulic rod 12 is provided on the support frame 1. A first gear 11 is installed on the outer wall of the first hydraulic rod 12. A first clamping device 2 is provided on the support frame 1. A rotation following device 5 is provided at the bottom end of the first hydraulic rod 12. A second clamping device 4 is provided inside the rotation following device 5. A first cable 13 for clamping is provided on the first clamping device 2 and the second clamping device 4. A torsion locking device 3 is connected to the first clamping device 2 and the second clamping device 4. When the first cable 13 is twisted, the torsion locking device 3 causes the first clamping device 2 and the second clamping device 4 to further clamp the first cable 13

[0032] As Figures 3 to 4 shown, the first clamping device 2 includes a transmission member 21, a limiting member 22, a clamping block 23, and a tightening member 24. The transmission member 21 is arranged at the center of the support frame 1. Two clamping blocks 23 are provided on the transmission member 21. The two clamping blocks 23 respectively clamp the outer wall and the metal wire of the cable. The clamping block 23 is connected with a limiting member 22 and a tightening member 24. The limiting member 22 is used to drive the clamping block 23 to clamp the cable when the transmission member 21 rises. The tightening member 24 is used to drive the torsion locking device 3 to rotate to prevent displacement between the cable and the clamping block 23 when the rotation following device 5 rotates. The second clamping device 4 and the first clamping device 2 are used to clamp both ends of the cable, and perform tensile and torsion tests by the contraction and rotation of the first hydraulic rod 12 away from each other

[0033] It should be noted that when the cable is clamped and detected, generally, the cable is clamped by two plates, and then the hydraulic press is used to move the two clamping parts away from each other for tensile testing. However, during the testing process, the metal wires of the cable cannot be clamped, so only the outer skin of the cable can be pulled, and the metal wires cannot be detected. Generally, when detecting the metal wires, the metal wires are pulled out separately for testing, resulting in inaccurate test data. To solve this problem, the following improvements are made:

[0034] The cable is preliminarily processed to remove the outer skin of the cable and the outer walls of the internal metal wires, obtaining the shape of the first cable 13 as shown in Figure 1 . The first hydraulic rod 12 is started to extend to the maximum length, and then the first cable 13 is placed on the first clamping device 2 and the second clamping device 4 inside the support frame 1. The hydraulic rod is started to drive the transmission part 21 to rise. The rising of the transmission part 21 drives the two clamping blocks 23 to clamp the outer wall of the first cable 13 and the metal wires on the first cable 13, realizing the clamping of the outer wall and metal wires of the first cable 13, and reducing the problem that it is not easy to detect the tensile condition of the metal wires inside the first cable 13 during the stretching and twisting process. After complete clamping, the first hydraulic rod 12 is started to contract, and the first hydraulic rod 12 drives the rotation following device 5 and the second clamping device 4 to approach the top of the support frame 1, so as to detect the first cable 13. The motor is used to drive the first gear 11 to rotate, and the rotation following device 5 drives the second clamping device 4 to rotate. The second clamping device 4 is connected to the first clamping device 2 through the torsion locking device 3. When the first cable 13 is twisted, the first cable 13 can be further clamped to prevent the first cable 13 from shifting from the clamping block 23 during twisting, and the purpose of twisting detection of the first cable 13 can be achieved. The clamping block 23 can comprehensively clamp the outer wall and metal wires of the first cable 13, increasing the clamping area, thereby improving the detection accuracy.

[0035] As shown in Figures 3 to 4 , the transmission part 21 includes a second hydraulic rod 211 fixedly installed on the support frame 1. The top of the second hydraulic rod 211 is fixedly installed with a lifting frame 212. The top of the lifting frame 212 is fixedly installed with a lifting block 213. The lifting block 213 is provided with a first locking block 214 and a second locking block 215. The clamping block 23 is arranged inside the first locking block 214 and the second locking block 215. The clamping block 23 inside the first locking block 214 is used to clamp the metal wires of the cable, and the clamping block 23 inside the second locking block 215 is used to clamp the outer wall of the cable.

[0036] It should be noted that clamping blocks 23 are provided inside both the lifting block 213 and the second locking block 215. When the first cable 13 is placed on the first clamping device 2, the outer wall of the first cable 13 and the metal wires on the first cable 13 can be clamped, achieving the effect of classified clamping and increasing the clamping area, thereby improving the accuracy of detection.

[0037] As Figures 4 to 5 shown, the limiting member 22 includes a limiting ring 221 rotatably mounted on the support frame 1 and concentric with the first locking block 214. Fixed columns 222 are circumferentially arranged at the top of the limiting ring 221. The fixed columns 222 are connected to the clamping block 23 and are used to limit the clamping block 23 when the first locking block 214 moves up and down.

[0038] As Figure 5 shown, the clamping block 23 includes a plurality of circular ring sliders 231 slidably arranged inside the first locking block 214 and the second locking block 215. The lifting blocks 213 are in contact with each other to form a circular ring. Circular ring protrusions 232 are arranged on the circular ring sliders 231. When the first locking block 214 and the second locking block 215 move up, the circular ring protrusions 232 drive the circular ring sliders 231 and the circular ring protrusions 232 to approach the center of the support frame 1 for clamping the cable and the metal wires.

[0039] It should be noted that when the lifting blocks 213 are in contact with each other to form a circular ring, when the first locking block 214 and the second locking block 215 move up, the circular ring protrusions 232 drive the circular ring sliders 231 and the circular ring protrusions 232 to approach the center of the support frame 1 for clamping the cable and the metal wires.

[0040] As Figure 5 shown, the tightening member 24 includes a first tightening column 241 fixedly installed at the top of the clamping block 23 inside the first locking block 214. A tightening ring 242 is slidably installed at the top of the first tightening column 241. A tightening groove 243 is arranged inside the tightening ring 242 and meshes with the tightening ring 242. Tightening grooves 243 are arranged at both the top and the bottom of the tightening ring 242. A second tightening column 244 is slidably arranged inside the top tightening groove 243. The top of the second tightening column 244 is connected to the clamping block 23 inside the second locking block 215. The second tightening column 244 and the first tightening column 241 are arranged in a staggered manner.

[0041] It should be noted that the limiting member 22 and the tightening member 24 are connected to the clamping block 23, which can limit the clamping block 23. Therefore, when the first locking block 214 and the second locking block 215 rise, the clamping block 23 can be driven to clamp the outer wall and the metal wire of the first cable 13. The design of the second tightening column 244 and the first tightening column 241 can drive the torsion locking device 3 to rotate when the second clamping device 4 and the rotation following device 5 rotate, thereby driving the tightening ring 242 to rotate, so that when the clamping blocks 23 approach each other during rotation, the first cable 13 is further clamped to prevent displacement between the clamping block 23 and the first cable 13.

[0042] As Figure 6 shown, the first clamping device 2 includes a blocking member 25 provided on the outer wall of the fixed column 222. The blocking member 25 includes a fixed block 251 fixedly installed on the outer wall of the fixed column 222. A first spring 253 is fixedly connected to the fixed block 251. A blocking block 252 is fixedly installed at the end of the first spring 253. The blocking block 252 is used to limit the bottom end and the top end of the cable metal wire.

[0043] It should be noted that a blocking block 252 is fixedly installed at the end of the first spring 253. The blocking block 252 is used to limit the bottom end and the top end of the cable metal wire when the first cable 13 is installed.

[0044] As Figure 7 shown, the torsion locking device 3 includes an I-shaped fixing plate 32 fixedly installed on the support frame 1. A second gear 31 and a third gear 33 are rotatably installed on the I-shaped fixing plate 32. The second gear 31 is fixedly installed on the outer wall of the tightening ring 242. The third gear 33 meshes with the second gear 31. A second spring 34 is fixedly installed at the top of the third gear 33. A telescopic rod 35 is fixedly installed at the top of the second spring 34. A third gear 33 meshing with the second clamping device 4 is provided on the outer wall of the telescopic rod 35.

[0045] It should be noted that, as Figure 7 shown, the first hydraulic rod 12 rotates in the manner indicated in Figure 7 . The first clamping device 2 is fixedly installed on the support frame 1. Therefore, during rotation, the second gears 31 on the first clamping device 2 and the second clamping device 4 cooperate with the I-shaped fixing plate 32 and the telescopic rod 35, so that the force application directions of the two second gears 31 are the same, thereby achieving the purpose of driving the second gear 31 to rotate. The rotation direction of the second gear 31 is to drive the second tightening column 244 and the first tightening column 241 on the tightening ring 242 to approach the center of the support frame 1, achieving a further clamping effect.

[0046] As Figure 7As shown, the rotating following device 5 includes a following block 51 fixedly mounted on the bottom end of the first hydraulic rod 12, a rotating ring 52 is rotatably mounted on the bottom end of the following block 51, a limiting column 53 is fixedly mounted on the bottom end of the rotating ring 52, a limiting block 54 is fixedly mounted on the bottom end of the limiting column 53, the interior of the limiting block 54 is rotatably connected to the top end of the telescopic rod 35, and is used to limit the telescopic rod 35.

[0047] It should be noted that the interior of the limit block 54 is rotatably connected to the top end of the telescopic rod 35, and is used to limit the telescopic rod 35. When the follower block 51 drives the second clamping device 4 to rotate, the rotating ring 52 will not rotate synchronously, and the I-shaped fixing plate 32 is rotatably connected to the third gear 33. The I-shaped fixing plate 32 is fixedly mounted on the support frame 1, thereby driving the telescopic rod 35 to rotate when the follower block 51 rotates. The second spring 34 is provided on the telescopic rod 35 to play a protective role and prevent the telescopic rod 35 from breaking due to excessive rotation.

[0048] like Figure 7 As shown, the second clamping device 4 is symmetrically arranged with the first clamping device 2 , and the second clamping device 4 is installed inside the following block 51 , and the following block 51 rotates to drive the second clamping device 4 to rotate synchronously.

[0049] like Figure 7 As shown, the first hydraulic rod 12 is kept concentric with the follower block 51 and the limiting ring 221 .

[0050] It should be noted that the first hydraulic rod 12 is kept concentric with the following block 51 and the limiting ring 221 , so as to improve the clamping accuracy of the first clamping device 2 and the second clamping device 4 .

[0051] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A clamping device for testing cable strength, comprising a support frame (1), characterized in that: The support frame (1) is provided with a first hydraulic rod (12), the outer wall of the first hydraulic rod (12) is installed with a first gear (11), the support frame (1) is provided with a first clamping device (2), the bottom end of the first hydraulic rod (12) is provided with a rotation follower (5), the interior of the rotation follower (5) is provided with a second clamping device (4), the first clamping device (2) and the second clamping device (4) are provided with a first cable (13) for clamping, the first clamping device (2) and the second clamping device (4) are connected with a torsion locking device (3), and when the first cable (13) is twisted, the torsion locking device (3) enables the first clamping device (2) and the second clamping device (4) to further clamp the first cable (13); The first clamping device (2) comprises a transmission member (21), a limiting member (22), a clamping block (23), and a tightening member (24); the transmission member (21) is arranged at the center of the support frame (1); two clamping blocks (23) are arranged on the transmission member (21); the two clamping blocks (23) clamp the outer wall of the cable and the metal wire respectively; the limiting member (22) and the tightening member (24) are connected to the clamping block (23); the limiting member (22) is used to drive the clamping block (23) to clamp the cable when the transmission member (21) rises; the tightening member (24) is used to drive the torsion locking device (3) to rotate when the rotation following device (5) rotates to prevent the cable and the clamping block (23) from being displaced; The second clamping device (4) and the first clamping device (2) are used to clamp the two ends of the cable and to move them away from each other through the contraction and rotation of the first hydraulic rod (12) to perform tension and torsion detection.

2. A clamping device for cable strength testing according to claim 1, characterized in that: The transmission member (21) comprises a second hydraulic rod (211) fixedly mounted on the support frame (1); a lifting frame (212) is fixedly mounted on the top of the second hydraulic rod (211); a lifting block (213) is fixedly mounted on the top of the lifting frame (212); a first locking block (214) and a second locking block (215) are arranged on the lifting block (213); clamping blocks (23) are arranged inside the first locking block (214) and the second locking block (215); the clamping block (23) inside the first locking block (214) is used to clamp the metal wire of the cable; and the clamping block (23) inside the second locking block (215) is used to clamp the outer wall of the cable.

3. A clamping device for testing cable strength according to claim 2, characterized in that: The limiting member (22) comprises a limiting ring (221) rotatably mounted on the support frame (1) and concentric with the first locking block (214); a fixing column (222) is arranged in a circular array at the top end of the limiting ring (221); the fixing column (222) is connected to the clamping block (23) and is used to limit the clamping block (23) when the first locking block (214) is raised or lowered.

4. A clamping device for cable strength testing according to claim 3, characterized in that: The clamping block (23) comprises a plurality of circular sliders (231) sliding inside the first locking block (214) and the second locking block (215); the lifting blocks (213) contact each other to form a circular ring; the circular sliders (231) are provided with circular protrusions (232); when the first locking block (214) and the second locking block (215) rise, the circular protrusions (232) drive the circular sliders (231) and the circular protrusions (232) to approach the center of the support frame (1) for clamping cables and metal wires.

5. A clamping device for testing cable strength according to claim 4, characterized in that: The tightening member (24) comprises a first tightening column (241) fixedly mounted on the top of a clamping block (23) inside the first locking block (214); a tightening ring (242) is slidably mounted on the top of the first tightening column (241); a tightening groove (243) is arranged inside the tightening ring (242) and meshes with the tightening ring (242); tightening grooves (243) are arranged on the top and bottom of the tightening ring (242); a second tightening column (244) is slidably arranged inside the tightening groove (243) at the top; the top of the second tightening column (244) is connected to the clamping block (23) inside the second locking block (215); and the second tightening column (244) and the first tightening column (241) are arranged alternately.

6. A clamping device for testing cable strength according to claim 5, characterized in that: The first clamping device (2) comprises a barrier member (25) arranged on the outer wall of the fixed column (222), the barrier member (25) comprising a fixed block (251) fixedly mounted on the outer wall of the fixed column (222), a first spring (253) being fixedly connected to the fixed block (251), a barrier block (252) being fixedly mounted on the end of the first spring (253), and the barrier block (252) being used to limit the bottom end and the top end of the cable metal wire.

7. A clamping device for testing cable strength according to claim 6, characterized in that: The twist locking device (3) comprises an I-shaped fixing plate (32) fixedly mounted on the support frame (1); a second gear (31) and a third gear (33) are rotatably mounted on the I-shaped fixing plate (32); the second gear (31) is fixedly mounted on the outer wall of the tightening ring (242); the third gear (33) meshes with the second gear (31); a second spring (34) is fixedly mounted on the top end of the third gear (33); a telescopic rod (35) is fixedly mounted on the top end of the second spring (34); and the outer wall of the telescopic rod (35) is provided with a third gear (33) meshing with the second clamping device (4).

8. A clamping device for testing cable strength according to claim 7, characterized in that: The rotary following device (5) comprises a following block (51) fixedly mounted on the bottom end of the first hydraulic rod (12); a rotating ring (52) is rotatably mounted on the bottom end of the following block (51); a limiting column (53) is fixedly mounted on the bottom end of the rotating ring (52); a limiting block (54) is fixedly mounted on the bottom end of the limiting column (53); the interior of the limiting block (54) is rotatably connected to the top end of the telescopic rod (35) for limiting the position of the telescopic rod (35).

9. A clamping device for testing cable strength according to claim 8, characterized in that: The second clamping device (4) is symmetrically arranged with the first clamping device (2); the second clamping device (4) is installed inside the follower block (51); the rotation of the follower block (51) is used to drive the second clamping device (4) to rotate synchronously.

10. A clamping device for testing cable strength according to claim 9, characterized in that: The first hydraulic rod (12) is kept concentric with the follower block (51) and the limiting ring (221).

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