A high-frequency spark testing machine for dynamic cable insulation performance testing

Abstract

The present invention relates to the technical field of cable insulation performance testing, and in particular to a high-frequency spark tester for dynamic cable insulation performance testing, comprising a high-frequency spark tester main body, a chain ball provided on the high-frequency spark tester main body, a first support member provided on the high-frequency spark tester main body, and a through-hole provided on the high-frequency spark tester main body; a torsion mechanism, comprising a fixed frame provided on the high-frequency spark tester main body, and a rotating member and a fixed shaft provided on the fixed frame, a first kneading part being rotatably provided on the fixed shaft, and the present invention enables the first kneading part to rotate with the fixed shaft as the rotation axis through the rotating member, twists the cable, realizes kneading, and causes the part of the cable placed in the chain ball to rotate, so that the contact distance between the cable and the chain ball changes during the transportation process, so that when damage occurs on the cable surface, the voltage can more easily break through the air to generate sparks, thereby improving the accuracy of detection.

Description

Technical Field

[0001] The invention relates to the technical field of cable insulation performance detection, in particular to a high-frequency spark testing machine for dynamic cable insulation performance detection. Background Art

[0002] The high-frequency spark tester applies high voltage to the chain ball. When the cable passes through the chain ball, if the cable surface is damaged, the high voltage will break through the air and produce sparks. When the cable insulation layer is intact, the high voltage will not break through and no sparks will be produced. Therefore, the high-frequency spark tester is often used to perform dynamic insulation performance testing on cables in transit.

[0003] There are usually several hanging chains on the high-frequency spark tester. The chains fall naturally due to gravity, and the conveying cables pass between the hanging chains. Since the chains are in a naturally falling state, they can generally better contact the side of the cable. However, for cables with thicker diameters, although the increase in diameter allows the top of the cable to fit by stretching the chains, the distance between the chains in the naturally falling state and the center of the lower surface of the cable is far, which increases the difficulty of breaking through the air. When damage occurs in the center of the lower surface of the cable, if the voltage is not enough to break through the air, it will cause missed detection, reducing the accuracy of detection. For this reason, a high-frequency spark tester for dynamic cable insulation performance detection is proposed. Summary of the Invention

[0004] In view of the problem in the above or prior art that missed detection is likely to occur when the cable diameter is relatively thick, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a high-frequency spark testing machine for dynamic cable insulation performance detection.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-frequency spark tester for dynamic cable insulation performance testing, comprising a high-frequency spark tester main body, a chain ball is provided on the high-frequency spark tester main body, a first support member is provided on the high-frequency spark tester main body, and a through-hole is provided on the high-frequency spark tester main body; a torsion mechanism, which includes a fixed frame provided on the high-frequency spark tester main body, and a rotating member and a fixed shaft provided on the fixed frame, and a first kneading part is rotatably provided on the fixed shaft.

[0007] As a preferred solution of the high-frequency spark tester for dynamic cable insulation performance testing of the present invention, wherein: the chain balls are provided with two and are symmetrically arranged on the main body of the high-frequency spark tester; the torsion mechanism also includes a second kneading part connected to the first kneading part; a second support member is provided on the main body of the high-frequency spark tester; and the first kneading part and the second kneading part form an angle of one hundred and eighty degrees.

[0008] As a preferred solution of the high-frequency spark testing machine for dynamic cable insulation performance detection of the present invention, the first kneading part includes a first swing arm, and a first arc-shaped frame arranged on the first swing arm, and also includes a first roller arranged on the first arc-shaped frame; the second kneading part includes a second swing arm, and a second arc-shaped frame arranged on the second swing arm, and also includes a second roller arranged on the second arc-shaped frame.

[0009] As a preferred solution of the high-frequency spark testing machine for dynamic cable insulation performance detection of the present invention, there are multiple first rollers, and the multiple first rollers are distributed in an arc-shaped array on the first arc frame; there are multiple second rollers, and the multiple second rollers are distributed in an arc-shaped array on the second arc frame.

[0010] As a preferred solution of the high-frequency spark testing machine for dynamic cable insulation performance detection of the present invention, the rotating part includes a motor arranged on the fixed frame, and a turntable arranged at the rotating end of the motor, and an eccentric column is provided on the turntable; a slide groove is provided on the first swing arm; the inner wall of the slide groove and the outer wall of the eccentric column are slidably connected.

[0011] As a preferred solution of the high-frequency spark tester for dynamic cable insulation performance detection of the present invention, the torsion mechanism further includes a connecting plate, and the first swing arm is connected to the second swing arm via the connecting plate.

[0012] As a preferred solution of the high-frequency spark tester for dynamic cable insulation performance detection of the present invention, the first support member includes a first support frame provided on the main body of the high-frequency spark tester, and a first rubber airbag rotatably provided on the first support frame; the first rubber airbag is provided with a first filling nozzle.

[0013] As a preferred solution of the high-frequency spark tester for dynamic cable insulation performance detection of the present invention, the second support member includes a second support frame provided on the main body of the high-frequency spark tester, and a second rubber airbag rotatably provided on the second support frame; the second rubber airbag is provided with a second filling nozzle.

[0014] As a preferred solution of the high-frequency spark tester for dynamic cable insulation performance detection of the present invention, wherein: a cover plate is rotatably provided on the main body of the high-frequency spark tester; it also includes a locking member, the locking member includes a rotating sleeve rotatably provided on the cover plate, and a screw sleeve rotatably provided in the rotating sleeve, one end of the screw sleeve is threadedly connected to a screw rod; one end of the screw rod is rotatably connected to the main body of the high-frequency spark tester; the fixed frame is provided on the cover plate.

[0015] As a preferred solution of the high-frequency spark tester for dynamic cable insulation performance detection of the present invention, it further includes a limiting member, which includes a limiting column arranged on the connecting plate and a roller sleeve rotatably arranged on the limiting column.

[0016] The beneficial effects of the high-frequency spark testing machine for dynamic cable insulation performance testing of the present invention: the present invention uses a rotating part to make the first kneading part rotate with the fixed axis as the rotation axis, twisting the cable to achieve kneading. After the cable is kneaded, it will produce twisting and rotation, causing the part of the cable placed in the chain ball to rotate, changing the contact part with the chain ball, and then causing the bottom surface of the cable to change continuously, causing the contact distance between it and the chain ball to change during the transportation process, so that when the cable surface is damaged, the voltage can more easily break through the air to generate sparks, thereby improving the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of a high-frequency spark testing machine for dynamic cable insulation performance testing.

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] Figure 3 This is a schematic diagram of the structure of the locking parts of the high-frequency spark tester for dynamic cable insulation performance testing.

[0021] Figure 4 Front view of a high-frequency spark tester for dynamic cable insulation performance testing.

[0022] In the figure: 1. High-frequency spark tester body; 11. Hammer; 12. First support member; 121. First support frame; 122. First rubber airbag; 123. First filling nozzle; 13. Second support member; 131. Second support frame; 132. Second rubber airbag; 133. Second filling nozzle; 14. Through-hole; 15. Cover plate; 2. Torsion mechanism; 21. Fixing frame; 22. Rotating member; 221. Motor; 222. Turntable; 223. Eccentric column; 23. Fixed shaft; 24. First kneading part; 241. First swing arm; 242. Slide groove; 243. First arc frame; 244. First roller; 25. Second kneading part; 251. Second swing arm; 252. Second arc frame; 253. Second roller; 26. Connecting plate; 3. Locking part; 31. Rotating sleeve; 32. Screw sleeve; 33. Screw; 4. Limiting part; 41. Limiting column; 42. Rolling sleeve. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0026] Example 1, with reference to Figures 1 to 4 , which is the first embodiment of the present invention, provides a high-frequency spark tester for dynamic cable insulation performance testing, including a high-frequency spark tester body 1, a chain ball 11 is provided on the high-frequency spark tester body 1, a first support member 12 is provided on the high-frequency spark tester body 1, and a through-hole 14 is provided on the high-frequency spark tester body 1; the high-frequency spark tester body 1 provides a high-frequency high-voltage voltage to the chain ball 11 for testing the cable surface, two through-holes 14 are symmetrically provided, the cable passes through the chain ball 11 through the through-holes 14, the first support member 12 is used to support the cable, and the cable is continuously transported by a traction mechanism or a winding machine and moves in the through-hole 14, thereby realizing dynamic cable insulation performance testing.

[0027] The torsion mechanism 2 includes a fixed frame 21 provided on the main body 1 of the high-frequency spark tester, and a rotating member 22 and a fixed shaft 23 provided on the fixed frame 21. A first kneading part 24 is rotatably provided on the fixed shaft 23. The rotating member 22 can make the first kneading part 24 rotate with the fixed shaft 23 as the rotation axis, and then cooperate with the first support member 12 to twist the cable placed between the first support member 12 and the first kneading part 24 to achieve kneading. After the cable is kneaded, it will produce twisting and rotation, so that the part of the cable placed in the chain ball 11 rotates, changing the contact part with the chain ball 11, and thus the bottom surface of the cable is constantly changed, so that the contact distance between the cable and the chain ball 11 changes during the transportation process, thereby increasing the contact part between the cable and the chain ball 11 during transportation, so that when the cable surface is damaged, the voltage can more easily break through the air to generate sparks, thereby improving the accuracy of detection.

[0028] It should be noted that since some of the cables tested are recycled cables and old cables, the insulation quality is poor. Compared with the traditional method of directly conveying the chain ball 11 for testing, the twisting or movement generated by the first kneading part 24 can also be used to detect whether the quality of the cable insulation is qualified. If the insulation is damaged during the twisting process, the high-frequency spark machine can also detect it, so as to judge the cable quality and further improve the detection effect.

[0029] Example 2, reference Figures 1 to 4 , which is the second embodiment of the present invention. Different from the previous embodiment, two chain balls 11 are provided and symmetrically arranged on the high-frequency spark testing machine body 1; the two chain balls 11 are respectively provided corresponding to the through-holes 14, and the torsion mechanism 2 further includes a second kneading part 25 connected to the first kneading part 24; the second kneading part 25 can also be driven by the rotating member 22 to rotate with the fixed shaft 23 as the rotation axis, thereby realizing the kneading operation of the cable.

[0030] A second support member 13 is provided on the main body 1 of the high-frequency spark tester. The second support member 13 is provided corresponding to the second kneading portion 25 . The second support member 13 is used to support the cable.

[0031] Specifically, the first kneading portion 24 and the second kneading portion 25 form an angle of 180 degrees.

[0032] It should be noted that since the first kneading part 24 and the second kneading part 25 use the same rotating shaft, that is, the fixed shaft 23, when the first kneading part 24 and the second kneading part 25 are controlled to rotate by the rotating member 22, the kneading directions of the two are opposite, that is, when any end of the cable is subjected to an upward force, the other end will be subjected to a downward force. During the detection process, the part of the cable located in the through-hole 14 is in a state where one end is high and the other end is low. Therefore, the two symmetrically arranged chain balls 11 will change the contact part with the cable. The change in the contact part here is not only the change in part caused by torsion, but also includes the displacement change caused by tilting, and the change in relative height between the chain ball 11. Therefore, the entire surface of the cable can be covered to achieve comprehensive detection. During the movement of the cable, the chain ball 11 will also cause a slight swing of the chain ball 11. The swinging state of the chain ball 11 will also cause the contact part with the cable to change, thereby improving the detection accuracy. Moreover, since the force directions at both ends of the cable are different, the kneading effect on the cable will also be improved, thereby increasing the torsional force on the cable surface, so as to facilitate the detection of the quality of the cable surface.

[0033] Example 3, reference Figures 1 to 4 , which is the third embodiment of the present invention. Different from the previous embodiment, the first kneading part 24 includes a first swing arm 241, and a first arc frame 243 provided on the first swing arm 241, and also includes a first roller 244 provided on the first arc frame 243; there are multiple first rollers 244, and the multiple first rollers 244 are distributed in an arc array on the first arc frame 243, and the first swing arm 241 is rotationally connected to the fixed shaft 23.

[0034] The second kneading part 25 includes a second swing arm 251, and a second arc frame 252 arranged on the second swing arm 251, and also includes a second roller 253 arranged on the second arc frame 252; there are multiple second rollers 253, and the multiple second rollers 253 are distributed in an arc array on the second arc frame 252, and the second swing arm 251 is rotatably connected to the fixed shaft 23.

[0035] It should be noted that since the first arc frame 243 and the second arc frame 252 are both arc-shaped structures, the first roller 244 arranged above the first arc frame 243 or the second roller 253 above the second arc frame 252 are both arranged in an arc array, the first roller 244 and the second roller 253 themselves are in a rotatable state, and the outer walls of the first roller 244 and the second roller 253 are in a vertical state, that is, the first roller 244 and the second roller 253 are cylindrical structures. Therefore, there must be a gap between the ends of adjacent first rollers 244, and there will also be a gap between adjacent second rollers 253. In the process of the cable being rubbed, the area where the gap is located is a buffer area, and the friction force when the gap contacts the cable surface will be relatively smaller than the friction force when contacting the outer wall of the first roller 244 or the second roller 253, so as to achieve a buffering effect and avoid damage to the cable due to excessive rubbing.

[0036] Example 4, reference Figures 1 to 4 , which is the fourth embodiment of the present invention. Different from the previous embodiment, the rotating member 22 includes a motor 221 arranged on the fixed frame 21, and a turntable 222 arranged at the rotating end of the motor 221, and an eccentric column 223 is provided on the turntable 222; the motor 221 controls the rotation of the turntable 222 to cause the eccentric column 223 to perform a circular motion.

[0037] A sliding groove 242 is provided on the first swing arm 241; the inner wall of the sliding groove 242 and the outer wall of the eccentric column 223 are slidingly connected. When the eccentric column 223 makes a circular motion, the eccentric column 223 will slide back and forth in the sliding groove 242, thereby driving the first swing arm 241 to rotate back and forth to realize the swing operation.

[0038] It should be noted that, referring to Figure 2 , since the eccentric column 223 will move away from the fixed shaft 23 or approach the fixed shaft 23 when it moves, when the eccentric column 223 rotates at a position away from the fixed shaft 23, since the eccentric column 223 is far away from the fixed shaft 23, the first swing arm 241 needs to have a larger stroke when it rotates a certain angle, and when the eccentric column 223 rotates at a position close to the fixed shaft 23, since the eccentric column 223 is close to the fixed shaft 23, the stroke of the first swing arm 241 when it rotates a certain angle is relatively smaller. Therefore, during the kneading process, after the first swing arm 241 and the second swing arm 251 reach the maximum swing angle, the resetting process will be faster, avoiding the cable damage caused by maintaining the maximum kneading state for a long time.

[0039] Specifically, the torsion mechanism 2 also includes a connecting plate 26, and the first swing arm 241 is connected to the second swing arm 251 through the connecting plate 26. Due to the setting of the connecting plate 26, the rotation radius of the second swing arm 251 will increase, and the second swing arm 251 can have a larger stroke and rubbing force. Since the cable is in a dynamic state and is wound by a traction machine or a winder, the difficulty of rubbing the cable at the pulling end and the difficulty of swinging up and down will also increase. Therefore, after increasing the rotation radius of the second swing arm 251 through the connecting plate 26, the problem of difficulty in rubbing the pulling end can be overcome, and the rubbing forces on the two ends of the cable can be different, so that each time the cable is rubbed, the torsion state of the two ends is different.

[0040] Furthermore, it also includes a limit member 4, which includes a limit column 41 provided on the connecting plate 26, and a roller sleeve 42 rotatably provided on the limit column 41. There are two limit columns 41, and the two limit columns 41 are symmetrically provided on the connecting plate 26. The cable passes through the two roller sleeves 42. When the connecting plate 26 swings, the roller sleeve 42 on the limit column 41 will also swing. During the swinging process, since the connecting plate 26 increases the rotation radius of the second swing arm 251, each time the cable is rubbed, the torsion state of the two ends of the cable is different, and the inclination angle of the two ends of the cable located on the roller sleeve 42 is also different. The roller sleeve 42 can serve as a limiting support, and since the swing angles of the cables on both sides of the roller sleeve 42 are different, the movement distance of the two ends of the cable relative to the chain ball 11 will also change. The different distance changes at the two ends can improve the detection accuracy.

[0041] It should be noted that, in addition to the pulling force on the pulling end, when the cable at the end is twisted, since the cable itself has a certain rigidity, during the operation of the device, the cable far away from the pulling end will be slightly bent after being twisted. Therefore, the swing amplitude of the chain ball 11 on the side away from the pulling end will be different from that of the chain ball 11 on the side close to the pulling end. By swinging the chain ball 11 at different frequencies, the detection accuracy can also be improved.

[0042] Example 5, with reference to Figures 1 to 4 , which is the fifth embodiment of the present invention. Different from the previous embodiment, the first support member 12 includes a first support frame 121 provided on the high-frequency spark tester body 1, and a first rubber airbag 122 rotatably provided on the first support frame 121; the first rubber airbag 122 is provided with a first filling nozzle 123.

[0043] Furthermore, the second support member 13 includes a second support frame 131 provided on the high-frequency spark tester body 1 , and a second rubber airbag 132 rotatably provided on the second support frame 131 ; a second filling nozzle 133 is provided on the second rubber airbag 132 .

[0044] The first rubber airbag 122 and the second rubber airbag 132 are filled with hydraulic oil. Liquid cannot be compressed. Therefore, the first rubber airbag 122 and the second rubber airbag 132 filled with hydraulic oil have a good supporting effect. At the same time, because they are made of rubber, they can effectively increase friction. The rotation of the first rubber airbag 122 and the second rubber airbag 132 can facilitate the transportation of the cable. Through the provision of the first filling nozzle 123 and the second filling nozzle 133, hydraulic oil can be added to the first rubber airbag 122 to change its diameter, so that the device is suitable for cables of different diameters and it is easy to adjust the friction between the cable.

[0045] Furthermore, since the diameters of the first rubber airbag 122 and the second rubber airbag 132 are adjustable, the pressure applied by the first roller 244 and the second roller 253 can also be adjusted to facilitate twisting the cable.

[0046] Example 6, reference Figures 1 to 4 , which is the sixth embodiment of the present invention. Different from the previous embodiment, a cover plate 15 is rotatably provided on the main body 1 of the high-frequency spark tester; the cover plate 15 has a C-shaped structure and is used to cover the chain ball 11 to ensure the safe operation of the equipment. The cover plate 15 is connected to the main body 1 of the high-frequency spark tester by a hinge. The cover plate 15 can be opened selectively to facilitate the placement of cables in the through-hole 14.

[0047] It also includes a locking member 3, which includes a rotating sleeve 31 rotatably arranged on the cover plate 15, and a screw sleeve 32 rotatably arranged in the rotating sleeve 31, one end of the screw sleeve 32 is threadedly connected to a screw rod 33; one end of the screw rod 33 is rotatably connected to the high-frequency spark tester body 1; the fixing frame 21 is arranged on the cover plate 15.

[0048] The through-hole 14 can be opened by rotating the cover 15, which is convenient for placing the cable. After placement, the cover 15 is closed, and the screw sleeve 32 and the screw rod 33 are rotated to align the screw sleeve 32 and the screw rod 33. After covering the cover 15, the first roller 244 is close to the outside of the first rubber airbag 122, and the second roller 253 is close to and fits the outside of the second rubber airbag 132. The screw sleeve 32 and the screw rod 33 are tightened until the first roller 244 and the second roller 253 are in a vertical state.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-frequency spark tester for dynamic cable insulation performance testing, characterized by: include, A high-frequency spark tester main body (1), wherein a chain ball (11) is provided on the high-frequency spark tester main body (1), a first support member (12) is provided on the high-frequency spark tester main body (1), and a through-hole (14) is provided on the high-frequency spark tester main body (1); A torsion mechanism (2) comprising a fixing frame (21) provided on the high-frequency spark tester body (1), and a rotating member (22) and a fixed shaft (23) provided on the fixing frame (21), wherein a first kneading portion (24) is rotatably provided on the fixed shaft (23); The chain balls (11) are provided in two pieces and are symmetrically arranged on the high-frequency spark testing machine body (1); The twisting mechanism (2) further includes a second kneading portion (25) connected to the first kneading portion (24); A second support member (13) is provided on the high-frequency spark tester body (1); The first kneading portion (24) and the second kneading portion (25) form an angle of 180 degrees; The cable is passed through the through hole (14) and inserted into the chain ball (11); The rotating member (22) can cause the first kneading portion (24) to rotate with the fixed shaft (23) as the rotation axis, thereby cooperating with the first support member (12) to twist the cable placed between the first support member (12) and the first kneading portion (24) to achieve kneading.

2. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 1, characterized in that: The first kneading portion (24) includes a first swing arm (241), a first arc-shaped frame (243) provided on the first swing arm (241), and a first roller (244) provided on the first arc-shaped frame (243); The second kneading portion (25) comprises a second swing arm (251), a second arc-shaped frame (252) provided on the second swing arm (251), and a second roller (253) provided on the second arc-shaped frame (252).

3. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 2, characterized in that: A plurality of the first rollers (244) are provided, and the plurality of first rollers (244) are distributed in an arc-shaped array on the first arc-shaped frame (243); A plurality of the second rollers (253) are provided, and the plurality of second rollers (253) are distributed in an arc-shaped array on the second arc-shaped frame (252).

4. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 2 or 3, characterized in that: The rotating member (22) comprises a motor (221) provided on the fixed frame (21), and a turntable (222) provided at the rotating end of the motor (221), wherein an eccentric column (223) is provided on the turntable (222); The first swing arm (241) is provided with a sliding groove (242); The inner wall of the sliding groove (242) and the outer wall of the eccentric column (223) are slidably connected.

5. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 4, characterized in that: The torsion mechanism (2) further comprises a connecting plate (26), and the first swing arm (241) is connected to the second swing arm (251) via the connecting plate (26).

6. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 1, 2 or 3, characterized in that: The first support member (12) comprises a first support frame (121) provided on the high-frequency spark tester body (1), and a first rubber airbag (122) rotatably provided on the first support frame (121); The first rubber airbag (122) is provided with a first filling nozzle (123).

7. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 6, characterized in that: The second support member (13) comprises a second support frame (131) provided on the high-frequency spark tester body (1), and a second rubber airbag (132) rotatably provided on the second support frame (131); The second rubber airbag (132) is provided with a second filling nozzle (133).

8. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 1, 2 or 3, characterized in that: A cover plate (15) is rotatably provided on the main body (1) of the high-frequency spark tester; It also includes a locking member (3), the locking member (3) including a rotating sleeve (31) rotatably arranged on the cover plate (15), and a screw sleeve (32) rotatably arranged in the rotating sleeve (31), one end of the screw sleeve (32) being threadedly connected to a screw rod (33); One end of the screw (33) is rotatably connected to the high-frequency spark tester body (1); The fixing frame (21) is arranged on the cover plate (15).

9. The high-frequency spark tester for dynamic cable insulation performance testing according to claim 5, characterized in that: It also includes a limiting member (4), which includes a limiting column (41) provided on the connecting plate (26) and a rolling sleeve (42) rotatably provided on the limiting column (41).

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