Cable flaw detection equipment

Abstract

The invention relates to the technical field of cable flaw detection, and discloses cable flaw detection equipment which comprises a high-frequency sensor main ring and a high-frequency sensor auxiliary ring, magnetic sheets are fixed to the opposite sides of the high-frequency sensor main ring and the high-frequency sensor auxiliary ring, and the high-frequency sensor main ring and the high-frequency sensor auxiliary ring are attracted through the magnetic sheets. The cable flaw detection equipment comprises a high-frequency sensor main ring and a high-frequency sensor auxiliary ring, a cable is arranged on the inner ring of the high-frequency sensor main ring and the inner ring of the high-frequency sensor auxiliary ring, a wrapping shell is fixed to the outer portion of the high-frequency sensor main ring, and the wrapping shell is connected with the high-frequency sensor auxiliary ring in a sliding mode. The wrapping shell is fixed to a telegraph pole through the elastic band, meanwhile, the linkage screw is driven by the pull rod to drive the copper sheet and the silica gel sheet to limit and clamp a cable, then the cable is limited, then flaw detection can be conducted after the high-frequency sensor auxiliary ring and the high-frequency sensor main ring are in butt joint, and then the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable flaw detection, and specifically provides a cable flaw detection device. Background Art

[0002] Cable flaw detection refers to the process of detecting the integrity and potential faults of cables through non-destructive means to determine whether the electrical and mechanical properties of the cables meet the requirements. The main purpose of cable flaw detection is to discover defects, damages or potential faults in the cables to ensure the normal operation and safe use of the cables. Cable flaw detection usually adopts a variety of methods, including partial discharge method, pulse current method, pulse magnetic field method, acoustic-magnetic synchronization method, etc.

[0003] Among them, when using the partial discharge method to detect cables, a portable partial discharge inspection instrument is often used to detect the inside of the cable insulation layer to locate the damaged part of the cable. When using the portable partial discharge inspection instrument to detect the ground wire of the high-voltage cable on the utility pole, the high-frequency sensor in the inspection instrument needs to be sleeved and clamped outside the cable ground wire, and then connected to the debugger through the detection line, and then started for detection through the controller.

[0004] During the detection process, in order to ensure the stability of the coupling between the high-frequency sensor and the cable, the inspector needs to hold the high-frequency sensor by hand to ensure that the high-frequency sensor clamp is outside the cable and does not contact the cable. In order to improve the detection accuracy, multiple detections are required. Therefore, the inspector needs to hold the high-frequency sensor by hand for a long time. However, holding the sensor by hand is unstable. During the detection process, if the inspector's hand cannot hold the high-frequency sensor firmly and shakes, it is easy to cause the stability of the coupling between the high-frequency sensor and the cable to decrease, thereby reducing the detection accuracy. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a cable flaw detection device to solve the problems raised in the above background art.

[0006] The present invention provides the following technical solution: A cable flaw detection device includes a main high-frequency sensor ring and a secondary high-frequency sensor ring. Magnetic sheets are fixed on the opposite sides of the main high-frequency sensor ring and the secondary high-frequency sensor ring, and the main high-frequency sensor ring and the secondary high-frequency sensor ring are adsorbed by the magnetic sheets. A cable is arranged inside the inner circles of the main high-frequency sensor ring and the secondary high-frequency sensor ring. A covering shell is fixed outside the main high-frequency sensor ring, and the covering shell is slidably connected to the secondary high-frequency sensor ring. Ear clips are fixed on both sides of one end of the covering shell close to the secondary high-frequency sensor ring.

[0007] An adjustment groove is provided at the middle position of the ear clip. A pull rod is slidably connected inside the adjustment groove. Jacks are provided at both the top and bottom ends of the pull rod. One end of the pull rod away from the high-frequency sensor sub-ring is fixed with a fixing plate, and one end of the fixing plate away from the ear clip is fixed with an elastic band.

[0008] Optionally, an inner groove is provided inside the end of the covering shell close to the high-frequency sensor sub-ring. A sliding rod is slidably connected inside the inner groove. One end of the sliding rod away from the cable is fixed with a linkage screw rod, and the linkage screw rod is slidably connected with the jack.

[0009] Optionally, inner sliding grooves are provided at both the top and bottom of the ear clip. The sliding rod and the linkage screw rod are slidably connected with the inner sliding grooves, and the inner sliding grooves are communicated with the inner groove.

[0010] Optionally, a copper sheet is fixed to the end of the sliding rod close to the cable. A silica gel sheet is fixed to the side of the copper sheet close to the cable, and the silica gel sheet contacts the cable.

[0011] Optionally, storage grooves are provided at the top and bottom of the end of the covering shell away from the ear clip. An opening groove is provided on one side of the covering shell close to the storage groove.

[0012] Optionally, an extension plate is slidably connected inside the storage groove. A square slider is fixed to one end of the extension plate close to the opening groove. The square slider is slidably connected with the opening groove. A threaded column is fixed to the end of the square slider away from the extension plate, and a nut is fixed to the outside of the threaded column.

[0013] Optionally, limiting rings are fixed to both ends of the two extension plates on the relatively far sides. Turbulence columns are threadedly connected inside the limiting rings.

[0014] Optionally, a limiting frame is fixed to the middle position of one side of the extension plate close to the limiting ring. A moving screw rod is slidably connected inside the limiting frame. A moving frame is fixed to the outside of one end of the moving screw rod. The moving frame abuts against the limiting frame, and a nut is provided on the outside of the moving screw rod.

[0015] Optionally, a fork plate is fixed to the position of the moving frame close to the cable. The fork plate is arranged in a V shape, and the fork plate abuts against the surface of the cable.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. For this cable flaw detection device, when it is necessary to detect the flaws of the overhead cable on the telegraph pole, the covering shell is fixed on the telegraph pole through the elastic band. At the same time, the pull rod drives the linkage screw rod to drive the copper sheet and the silica gel sheet to limit and clamp the cable, so that the cable is limited. Subsequently, after the high-frequency sensor sub-ring is docked with the high-frequency sensor main ring, the flaw detection can be carried out, thereby improving the accuracy of the detection.

[0018] 2. When the cable flaw detection device is on a flat ground, by placing the cladding shell vertically, the extension plate is in contact with the ground, and the contact area between the cladding shell and the ground is enlarged by the extension plate, thereby improving the stability of the cladding shell after landing. Subsequently, the cable can be placed on the fork plate for flaw detection.

[0019] 3. When the cable flaw detection device is on the soil, that is, when the ground is uneven, by rotating each spoiler column, each spoiler column is drilled into the soil in turn, and according to the different drilling depths, the levelness of the extension plate is adjusted so that the extension plate tends to be horizontal with the ground, and then the extension plate tends to be horizontal with the cable, thereby improving the coupling stability between the cable and the main loop of the high-frequency sensor and the secondary loop of the high-frequency sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the present invention;

[0021] Figure 2 It is an assembled schematic diagram of the main loop of the high-frequency sensor and the secondary loop of the high-frequency sensor of the present invention;

[0022] Figure 3 [[ID=N19]]It is an assembled schematic diagram of the high-frequency sensor and the cladding shell of the present invention;

[0023] Figure 4 It is an exploded schematic diagram of the ear clip and the cladding shell of the present invention;

[0024] Figure 5 It is a schematic diagram of the positional relationship among the pull rod, the sliding rod and the linkage screw of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the limit ring and the spoiler column of the present invention;

[0026] Figure 7 It is an exploded schematic diagram of the limit frame, the moving screw and the moving frame of the present invention.

[0027] In the figure: 1. Main loop of the high-frequency sensor; 11. Cladding shell; 12. Secondary loop of the high-frequency sensor; 13. Magnetic sheet; 14. Cable; 2. Ear clip; 21. Adjusting groove; 22. Pull rod; 23. Jack; 24. Fixed plate; 25. Elastic band; 3. Inner groove; 31. Sliding rod; 32. Linkage screw; 33. Inner sliding groove; 34. Copper sheet; 35. Silicone sheet; 4. Storage groove; 41. Opening groove; 42. Extension plate; 43. Square slider; 44. Threaded column; 5. Limit ring; 51. Spoiler column; 6. Limit frame; 61. Moving screw; 62. Moving frame; 63. Fork plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] Please refer to Figure 1-7 , a cable flaw detection device, including a main high-frequency sensor ring 1 and a secondary high-frequency sensor ring 12. Magnetic sheets 13 are fixed on both opposite sides of the main high-frequency sensor ring 1 and the secondary high-frequency sensor ring 12, and the main high-frequency sensor ring 1 and the secondary high-frequency sensor ring 12 are adsorbed through the magnetic sheets 13. A cable 14 is arranged inside the inner circles of the main high-frequency sensor ring 1 and the secondary high-frequency sensor ring 12. It is characterized in that: a covering shell 11 is fixed outside the main high-frequency sensor ring 1, the covering shell 11 is slidably connected with the secondary high-frequency sensor ring 12. Earcuffs 2 are fixed on both sides of the end of the covering shell 11 close to the secondary high-frequency sensor ring 12. An adjustment groove 21 is opened in the middle position of the earcuff 2. A pull rod 22 is slidably connected inside the adjustment groove 21. Jacks 23 are opened at both the top and the bottom of the pull rod 22. One end of the pull rod 22 away from the secondary high-frequency sensor ring 12 is fixed with a fixing plate 24, and an elastic band 25 is fixed at one end of the fixing plate 24 away from the earcuff 2;

[0031] An inner groove 3 is opened inside the end of the covering shell 11 close to the secondary high-frequency sensor ring 12. A sliding rod 31 is slidably connected inside the inner groove 3. One end of the sliding rod 31 away from the cable 14 is fixed with a linkage screw rod 32. The linkage screw rod 32 is slidably connected with the jack 23. Inner sliding grooves 33 are opened at both the top and the bottom of the earcuff 2. The sliding rod 31 and the linkage screw rod 32 are slidably connected with the inner sliding grooves 33, and the inner sliding grooves 33 are communicated with the inner groove 3. One end of the sliding rod 31 close to the cable 14 is fixed with a copper sheet 34. A silica gel sheet 35 is fixed on the side of the copper sheet 34 close to the cable 14. The silica gel sheet 35 is in contact with the cable 14;

[0032] During the operation, first connect one end of the detection line to the debugger, then connect the other end of the detection line to the connection port of the high-frequency sensor secondary loop 12. Subsequently, after the inspector manually touches and adsorbs the high-frequency sensor main loop 1 and the high-frequency sensor secondary loop 12, put the high-frequency sensor main loop 1 and the high-frequency sensor secondary loop 12 outside the cable 14. Then, after adsorbing the high-frequency sensor main loop 1 and the high-frequency sensor secondary loop 12 through the magnetic plate 13, the inspector manually holds the high-frequency sensor main loop 1 and the high-frequency sensor secondary loop 12 to ensure that the high-frequency sensor main loop 1 and the high-frequency sensor secondary loop 12 do not contact the cable 14. Then, control the high-frequency sensor main loop 1, the high-frequency sensor secondary loop 12, and the debugger to detect the cable 14 through the display. Here is the detection process of the high-frequency sensor main loop 1 and the high-frequency sensor secondary loop 12 in the prior art, which will not be elaborated in this application;

[0033] Specifically, during the actual operation of the present invention, when detecting the ground wire on the utility pole, first lift the high-frequency sensor main loop 1 to the position of the utility pole, snap the first pull rod 22 into the internal part of the adjustment slot 21, and make the jack 23 sleeve outside the corresponding linkage screw 32. Subsequently, pull the second pull rod 22, so that the second pull rod 22 drives the fixed plate 24 and the elastic band 25 to bypass the utility pole and snap into the second ear clip 2 on the side opposite to the first ear clip 2 inside the adjustment slot 21. Thus, under the action of the two pull rods 22, the fixed plate 24, and the elastic band 25, the covering shell 11 is fixed at the designated position on the utility pole;

[0034] During the process of fixing the covering shell 11, sleeve a nut outside the linkage screw 32 and adjust the position of the pull rod 22 in the adjustment slot 21 left and right. During the adjustment of the pull rod 22, drive the linkage screw 32 to adjust inside the inner sliding slot 33, so that the linkage screw 32 drives the sliding rod 31 to slide and adjust inside the inner sliding slot 33 and the inner slot 3, and makes the linkage screw 32 drive the copper sheet 34 and the silica gel sheet 35 to adjust synchronously. Through the manual adjustment of the inspector, make the copper sheet 34 and the silica gel sheet 35 fit on the surface of the cable 14;

[0035] When all the copper sheets 34 and silica gel sheets 35 are fitted on the surface of the cable 14, the cable 14 can be limited and clamped. At the same time, after the adjustment is completed, the nut can be rotated to lock the linkage screw 32 at the designated position inside the inner sliding slot 33. Thus, the pull rod 22 is locked at the designated position inside the adjustment slot 21, and then the elastic band 25 is locked. Thus, under the pulling force of the elastic band 25, the covering shell 11 is bound at the designated position on the utility pole. Subsequently, snap the high-frequency sensor secondary loop 12 into the inside of the covering shell 11, so that the high-frequency sensor secondary loop 12 and the high-frequency sensor main loop 1 are adsorbed through the magnetic plate 13, achieving the purpose of sleeving and clamping the cable 14 without contacting the cable 14;

[0036] Since the cladding shell 11 is constrained in a specified position and is not interfered by manual support, the stability of the coupling between the main high-frequency sensor loop 1 and the secondary high-frequency sensor loop 12 to the cable 14 is improved during the later flaw detection of the cable 14, thereby improving the accuracy of the flaw detection. At the same time, the cable 14 is also clamped by the copper sheet 34 and the silica gel sheet 35, preventing the wind around the cable 14 from blowing the cable to dance or shake, and thus avoiding the decrease in the coupling stability caused by the shaking of the cable 14, further improving the accuracy of the flaw detection of the cable 14.

[0037] It should be noted that the cladding shell 11 of the present invention is made of carbon fiber composite material. On the basis of maintaining lightness, it is sufficient to support the main high-frequency sensor loop 1 and the secondary high-frequency sensor loop 12, and avoid interfering with the main high-frequency sensor loop 1 and the secondary high-frequency sensor loop 12. Due to the presence of the copper sheet 34, it can play a role in shielding external electromagnetic interference to a certain extent, further improving the accuracy of the flaw detection of the cable 14 of the present invention. And due to the presence of the silica gel sheet 35, when clamping and limiting the cable 14, the pressure on the cable 14 can be reduced. While ensuring the limit, it avoids excessive clamping force resulting in deformation of the cable 14. At the same time, the silica gel sheet 35 will not interfere with the main high-frequency sensor loop 1 and the secondary high-frequency sensor loop 12.

[0038] Embodiment 2:

[0039] Receiving grooves 4 are opened at the top and bottom of the end of the cladding shell 11 away from the ear clip 2. An opening groove 41 is opened on one side of the cladding shell 11 close to the receiving groove 4. An extension plate 42 is slidably connected inside the receiving groove 4. A square slider 43 is fixed at one end of the extension plate 42 close to the opening groove 41. The square slider 43 is slidably connected with the opening groove 41. A threaded column 44 is fixed at the end of the square slider 43 away from the extension plate 42. A nut is fixed on the outside of the threaded column 44;

[0040] A limiting frame 6 is fixed at the middle position of the side of the extension plate 42 close to the limiting ring 5. A moving screw 61 is slidably connected inside the limiting frame 6. A moving frame 62 is fixed on the outside of one end of the moving screw 61. The moving frame 62 abuts against the limiting frame 6. A nut is provided on the outside of the moving screw 61. A fork plate 63 is fixed at the position of the moving frame 62 close to the cable 14. The fork plate 63 is arranged in a V shape and abuts against the surface of the cable 14;

[0041] Specifically, on the basis of the first embodiment, when the covering shell 11 is bound to the utility pole, the extension plates 42 can be pulled to extend outwards from the inside of the storage groove 4. Subsequently, the threaded column 44 is locked by the nut on the threaded column 44, thereby increasing the contact area between the covering shell 11 and the utility pole, increasing the friction between the covering shell 11 and the utility pole, and then avoiding the center of gravity instability and tipping of one end of the covering shell 11 after bearing the debugger, the main high-frequency sensor ring 1 and the auxiliary high-frequency sensor ring 12. Thus, after the covering shell 11 is bound and the main high-frequency sensor ring 1 is docked with the auxiliary high-frequency sensor ring 12, the stability of the covering shell 11 is improved;

[0042] After the extension of the extension plates 42 is completed, the nut outside the moving screw rod 61 can be rotated to unlock the moving screw rod 61 from the limiting frame 6, and then the moving frame 62 is dragged to drive the moving screw rod 61 to slide and adjust inside the limiting frame 6, so that the moving frame 62 drives the fork plate 63 to slide and adjust, making the fork plate 63 contact the cable 14, and further limiting the cable 14 through the fork plate 63. Subsequently, the influence of outdoor wind on the cable 14 is reduced again, the amplitude of the cable 14 shaking is reduced, and thus the accuracy of detecting the cable 14 of the present invention is improved;

[0043] Further, when the cable 14 to be flaw-detected is not perpendicular to the utility pole but on the ground, the pull rod 22 can be taken out from the inside of the ear clip 2, and then the covering shell 11 is placed vertically so that the covering shell 11 and the extension plates 42 contact the ground. Since the contact area between the covering shell 11 and the ground is increased after the extension plates 42 extend outwards, the covering shell 11 is more stable after being placed vertically, reducing the risk of collapse. Subsequently, according to the above steps, the position of the fork plate 63 is adjusted so that the fork plate 63 is located below the cable 14, and then the cable 14 is placed on the surface of the fork plate 63. After the cable 14 is supported and limited by the fork plate 63, the auxiliary high-frequency sensor ring 12 is docked and snapped into the inside of the covering shell 11;

[0044] When the auxiliary high-frequency sensor ring 12 is snapped into the inside of the covering shell 11, the adsorption and fixation of the main high-frequency sensor ring 1 and the auxiliary high-frequency sensor ring 12 are completed. At this time, the cable 14 is still inside the main high-frequency sensor ring 1 and the auxiliary high-frequency sensor ring 12 under the lifting of the fork plate 63 and does not contact the main high-frequency sensor ring 1 and the auxiliary high-frequency sensor ring 12, thus ensuring the stability of the coupling between the cable 14 and the main high-frequency sensor ring 1 and the auxiliary high-frequency sensor ring 12, and then improving the accuracy of flaw detection of the cable 14 located on the ground.

[0045] Embodiment Three:

[0046] Limit rings 5 are fixed at both ends of the relatively far side of the two extension plates 42, and spoiler columns 51 are threadedly connected inside the limit rings 5;

[0047] Specifically, on the basis of Embodiments 1 and 2, when the present invention performs flaw detection on the cable 14 on the utility pole, as the extension plate 42 extends and protrudes from the inside of the storage groove 4, the extension plate 42 synchronously drives the displacement of the limiting ring 5, and then the limiting ring 5 drives the displacement of the spoiler column 51, and the spoiler column 51 is located on both sides of the cable 14;

[0048] When the outdoor wind is strong, since the cable 14 is in an overhead state, the spoiler columns 51 on both sides of the cable 14 perform a spoiler operation on the wind blowing towards the cable 14, and through the thread grooves formed on the surface of the spoiler columns 51, the spoiler effect is further improved, avoiding the wind from blowing the cable 14 in a fixed direction, and then reducing the probability of the cable 14 shaking. With the clamping and limiting effects of the copper sheet 34 and the silica gel sheet 35, the flaw detection stability of the main ring 1 of the high-frequency sensor and the sub-ring 12 of the high-frequency sensor is further improved;

[0049] When the present invention performs flaw detection on the cable 14 on the ground, if the ground is flat, the spoiler columns 51 can be taken out from the inside of the limiting ring 5, and only the covering shell 11 and the extension plate 42 need to be in contact with the ground. When the ground is soil, that is, when the ground is uneven, in order to ensure the stability of the covering shell 11 placed vertically and ensure the coupling stability of the main ring 1 of the high-frequency sensor, the sub-ring 12 of the high-frequency sensor and the cable 14, the spoiler columns 51 can be rotated, so that the spoiler columns 51 drill into the soil under rotation. As the depths of the various spoiler columns 51 drilled are different, the levelness of the four feet of the covering shell 11 and the extension plate 42 is adjusted, making the extension plate 42 tend to be horizontal. Furthermore, when the main ring 1 of the high-frequency sensor and the sub-ring 12 of the high-frequency sensor clamp the cable 14, the main ring 1 of the high-frequency sensor and the sub-ring 12 of the high-frequency sensor are prevented from contacting the cable 14, thereby improving the coupling stability of the present invention with the cable 14.

[0050] It should be noted that there are four limiting rings 5 and spoiler columns 51 in total, and they are respectively located at the four corners of the two extension plates 42 that are relatively far away from each other. As a result, the depths of the four spoiler columns 51 entering the soil are different, indirectly adjusting the levelness of the extension plate 42, making the extension plate 42 drive the covering shell 11 to be level with the ground, thereby improving the coupling stability of the main ring 1 of the high-frequency sensor, the sub-ring 12 of the high-frequency sensor and the cable 14, as well as the accuracy of flaw detection.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cable flaw detection device, comprising a main high-frequency sensor ring (1) and a secondary high-frequency sensor ring (12). Magnetic sheets (13) are fixed on opposite sides of the main high-frequency sensor ring (1) and the secondary high-frequency sensor ring (12), and the main high-frequency sensor ring (1) and the secondary high-frequency sensor ring (12) are adsorbed through the magnetic sheets (13). A cable (14) is provided in the inner circles of the main high-frequency sensor ring (1) and the secondary high-frequency sensor ring (12), and it is characterized in that: An outer part of the main loop (1) of the high-frequency sensor is fixed with a covering shell (11). The covering shell (11) is slidably connected with a secondary loop (12) of the high-frequency sensor. On both sides of one end of the covering shell (11) close to the secondary loop (12) of the high-frequency sensor, ear clips (2) are fixed. An adjustment groove (21) is formed in a middle position of the ear clip (2). A pull rod (22) is slidably connected inside the adjustment groove (21). Insertion holes (23) are formed at both the top end and the bottom end of the pull rod (22). One end of the pull rod (22) far away from the secondary loop (12) of the high-frequency sensor is fixed with a fixing plate (24). One end of the fixing plate (24) far away from the ear clip (2) is fixed with an elastic band (25).

2. The cable flaw detection device according to claim 1, wherein: An inner groove (3) is formed inside one end of the covering shell (11) close to the secondary loop (12) of the high-frequency sensor. A sliding rod (31) is slidably connected inside the inner groove (3). One end of the sliding rod (31) far away from a cable (14) is fixed with a linkage screw rod (32). The linkage screw rod (32) is slidably connected with the insertion hole (23).

3. The cable flaw detection device according to claim 2, wherein: Inner sliding grooves (33) are formed at both the top and the bottom of the ear clip (2). The sliding rod (31) and the linkage screw rod (32) are slidably connected with the inner sliding groove (33), and the inner sliding groove (33) communicates with the inner groove (3).

4. The cable flaw detection device according to claim 3, wherein: One end of the sliding rod (31) close to the cable (14) is fixed with a copper sheet (34). One side of the copper sheet (34) close to the cable (14) is fixed with a silica gel sheet (35). The silica gel sheet (35) contacts with the cable (14).

5. The cable flaw detection device according to claim 4, characterized in that: Receiving grooves (4) are formed at both the top and the bottom of one end of the covering shell (11) far away from the ear clip (2). An opening groove (41) is formed at one side of the covering shell (11) close to the receiving groove (4).

6. The cable flaw detection device according to claim 5, wherein: An extension plate (42) is slidably connected inside the receiving groove (4). One end of the extension plate (42) close to the opening groove (41) is fixed with a square slider (43). The square slider (43) is slidably connected with the opening groove (41). One end of the square slider (43) far away from the extension plate (42) is fixed with a threaded column (44). A nut is fixed outside the threaded column (44).

7. The cable flaw detection device according to claim 6, characterized in that: At both ends of opposite and far-away sides of the two extension plates (42), limiting rings (5) are fixed. Turbulence columns (51) are threadedly connected inside the limiting rings (5).

8. The cable flaw detection device according to claim 7, characterized in that: A limiting frame (6) is fixed at a middle position of one side of the extension plate (42) close to the limiting ring (5). A moving screw rod (61) is slidably connected inside the limiting frame (6). A moving frame (62) is fixed outside one end of the moving screw rod (61). The moving frame (62) abuts against the limiting frame (6). A nut is arranged outside the moving screw rod (61).

9. The cable flaw detection device according to claim 8, characterized in that: A fork plate (63) is fixed at a position of the moving frame (62) close to the cable (14). The fork plate (63) is arranged in a V shape. The fork plate (63) abuts against the surface of the cable (14).

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