A power frequency spark tester for online cable testing

Abstract

This invention relates to the field of online cable testing technology, specifically an online power frequency spark tester for cables. It includes a worktable and four support legs, which are fixed at the four corners of the bottom of the worktable. An adjustment assembly is installed between the four support legs. A testing box is installed in the center of the top of the worktable. The outer walls of both sides of the testing box have insertion holes. A detector for testing cables is installed inside the testing box. Rectangular slots are formed on both sides of the top of the worktable near the testing box. Two circular holes are formed on the outer peripheral wall of the worktable, communicating with the two rectangular slots. Clamping assemblies are installed inside the rectangular slots, aligned with the insertion holes. Locking assemblies are installed inside the circular holes. Universal wheels are fixed to the bottom of the support legs. This invention can lift and clamp cables of different diameters.

Description

Technical Field

[0001] This invention relates to the field of online cable testing technology, specifically a power frequency spark tester for online cable testing. Background Technology

[0002] A spark tester is an online testing device placed on the winding section of wire and cable products during production. Its main function is to use frequency voltage to detect whether the wire and cable products have copper leakage, broken insulation, surface impurities, insulation withstand voltage, etc. The spark tester applies a set voltage value to the insulated wire periodically according to a certain pattern, while the conductor is grounded. This creates a voltage difference between the conductor and the insulation surface, which can detect whether there are defects in the insulation layer, ensuring that the wire and cable products are qualified for shipment.

[0003] Spark testing is mainly used to detect defects such as pinholes, impurities, and missing adhesive in the insulation or sheath of wires and cables. However, existing spark testing machines do not have a dedicated device to support the circuit during use. This causes most of the circuit area to rub against the test plate, resulting in damage to the circuit and affecting the test results. Summary of the Invention

[0004] The purpose of this invention is to provide an online power frequency spark tester for cables to solve the problems mentioned in the background art.

[0005] The technical solution of the present invention is: an online power frequency spark tester for testing cables, comprising a worktable and four support legs, the four support legs being fixed at the four corners of the bottom of the worktable respectively, an adjustment assembly being installed between the four support legs, a test box being installed at the center of the top of the worktable, and insertion holes being provided on both outer walls of the test box, a detector for testing cables being installed inside the test box, rectangular slots being provided on both sides of the top of the worktable, and two circular holes being provided on the outer peripheral wall of the worktable, the two circular holes communicating with the two rectangular slots respectively, clamping assemblies being installed inside the rectangular slots, the clamping assemblies being aligned with the insertion holes, and locking assemblies being installed inside the circular holes.

[0006] Preferably, the bottom of the support leg is fixed with a caster wheel.

[0007] Preferably, both outer walls of the testing box are provided with fixing rings aligned with the insertion holes. A rubber membrane is provided between the fixing rings and the testing box. Multiple positioning holes are provided on the outer walls of both the fixing rings and the rubber membrane. Fixing bolts are slidably installed on the inner walls of the positioning holes. The fixing rings are fixed to the outer walls of the testing box by the fixing bolts. A through hole coaxial with the insertion holes is provided on the outer wall of the rubber membrane.

[0008] Preferably, the adjustment assembly includes a fixed plate, a base plate, and two linkage mechanisms. All four support legs are fixed to the outer wall of the fixed plate. The fixed plate is located above the base plate. The linkage mechanisms are arranged between the fixed plate and the base plate, and the two linkage mechanisms are symmetrical to each other.

[0009] Preferably, the linkage mechanism includes a crossbar, two connecting rods (first and second), two fixing blocks (first and second). Each of the two fixing blocks (first and second), one end of each connecting rod (first and second), has a rotating hole. The crossbar rotates on the inner wall of the rotating hole. The two fixing blocks (first) are fixed to the bottom of a fixing plate. The other end of each connecting rod (first) is rotatably mounted on one side of the outer wall of the fixing block (first). The fixing blocks (second) are fixed to the top of a base plate. The other end of each connecting rod (second) is rotatably mounted on one side of the outer wall of the fixing block (second). A threaded rod is rotatably mounted on the outer wall of one of the crossbars. One end of the threaded rod passes through the other crossbar, and the threaded rod is connected to the crossbar it passes through via a thread.

[0010] Preferably, the clamping assembly includes two support plates, two movable plates II, two guide rods II, two clamping plates I and one clamping plate II. The two support plates are fixed to the top of the workbench and are located on both sides of the rectangular groove. The two guide rods II are fixed at both ends to the outer walls of the two support plates. The outer wall of the movable plate II has two guide holes II. The guide rods II are slidably installed on the inner wall of the guide holes II. The bottom of the movable plate II is equipped with the same centering mechanism. The clamping plate II is fixed to the top of one of the movable plates II. The two clamping plates I are fixed to the top of the other movable plate II. The outer walls of the clamping plates I and II on opposite sides are provided with V-shaped grooves.

[0011] Preferably, the centering mechanism includes two connecting rods three and a rotating plate. A fixing post is fixed at the middle position of the bottom of the rotating plate. The fixing post is rotatably installed on the inner wall of the bottom of the rectangular groove. One end of the two connecting rods three forms a rotatable engagement with the two ends of the rotating plate. The other end of the connecting rods three is rotatably installed at the bottom of the moving plate two. A connecting rod four for connecting with the locking assembly is rotatably installed at the bottom of the rotating plate.

[0012] Preferably, the locking assembly includes an adjusting mechanism, a pull rod, a circular plate, a spring, a movable cylinder, and two limiting rods. The pull rod is slidably mounted on the inner wall of the circular hole, and one end of the pull rod is rotatably engaged with one end of the connecting rod. The circular plate is located outside the rectangular groove and fixed to the other end of the pull rod. The adjusting mechanism is mounted on the pull rod. The movable cylinder is slidably sleeved on the outer wall of the pull rod and is positioned between the circular plate and the adjusting mechanism. The spring is sleeved on the outer wall of the pull rod, and both ends of the spring are in contact with the movable cylinder and the circular plate, respectively. The limiting rods are fixed to the outer wall of the movable cylinder.

[0013] Preferably, the adjustment mechanism includes a movable plate, a mounting hole is provided in the middle of one side outer wall of the movable plate, a fixing cylinder is fixed to the inner wall of the mounting hole, two positioning ports 1 adapted to the limiting rod are provided at one end of the fixing cylinder, two positioning ports 2 adapted to the limiting rod are provided at one end of the fixing cylinder, the length of the positioning ports 2 is longer than the length of the positioning ports 1, a guide hole 1 and a threaded hole are respectively provided at both ends of one side outer wall of the movable plate, a guide rod 1 is slidably installed on the inner wall of the guide hole 1, one end of the guide rod 1 is fixed to the worktable, and a threaded post is threadedly connected to the inner wall of the threaded hole, one end of the threaded post is rotatably installed on the worktable.

[0014] This invention provides an improved online power frequency spark tester for cables, which has the following improvements and advantages compared with the prior art:

[0015] Firstly, this invention pulls the limiting rod outward, and the moving cylinder moves synchronously with the limiting rod. The moving cylinder moves the pull rod with the help of a spring. One end of the pull rod is connected to the fourth connecting rod, which makes the rotating plate rotate counterclockwise. The rotating plate pulls the two third connecting rods, and the moving plate two on the two third connecting rods moves closer to each other, that is, the clamping plate two and the clamping plate one move closer to each other until the clamping plate two and the clamping plate one clamp the cable. Then, the limiting rod is pulled outward, the spring is compressed, and then the moving cylinder is rotated so that the limiting rod is aligned with the positioning port one. Then the limiting rod is locked in the positioning port one, thus completing the locking. In this way, cables of different diameters can be lifted and clamped.

[0016] Secondly, this invention rotates the threaded rod, which drives one of the crossbars to move through the threaded transmission, causing the two crossbars to move away from each other. At the same time, the clamping between the first and second connecting rods increases, thereby controlling the distance between the fixed plate and the base plate to increase until the base plate touches the ground, lifting the casters off the ground. In this way, the device cannot move. If the height is not high enough, the two crossbars can continue to move away from each other to adjust the height.

[0017] Thirdly, this invention prevents leakage by inserting the cable into the through hole, causing the rubber membrane to elastically deform and wrap around the cable. Attached Figure Description

[0018] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 yes Figure 1 Enlarged view of point A;

[0021] Figure 3 yes Figure 1Enlarged view of point B;

[0022] Figure 4 This is a side view of the present invention;

[0023] Figure 5 This is a front view of the present invention;

[0024] Figure 6 yes Figure 5 AA section view;

[0025] Figure 7 yes Figure 6 Enlarged view of point C;

[0026] Figure 8 This is a cross-sectional view of the clamping assembly of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Workbench; 2. Inspection box; 3. Support leg; 4. Adjustment assembly; 41. Fixing plate; 42. Crossbar; 43. Base plate; 44. Link 1; 45. Link 2; 46. Fixing block 1; 47. Fixing block 2; 48. Threaded rod; 5. Caster wheel; 6. Locking assembly; 61. Pull rod; 62. Moving plate 1; 63. Guide rod 1; 64. Threaded column; 65. Limiting rod; 66. Fixing cylinder; 661. Positioning port 1; 662. Positioning port 2; 67. Moving cylinder; 68. Spring; 69. Circular plate; 7. Clamping assembly; 71. Support plate; 72. Clamping plate 1; 73. Moving plate 2; 74. Clamping plate 2; 75. Guide rod 2; 76. Centering mechanism; 761. Link 3; 762. Rotating plate; 763. Connecting rod four; 764. Fixed post; 8. Fixed ring; 9. Rubber diaphragm. Detailed Implementation

[0029] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This invention provides an improved online power frequency spark tester for cables. The technical solution of this invention is as follows:

[0031] like Figures 1-8As shown, an online power frequency spark tester for cables includes a worktable 1 and four support legs 3. Both the worktable 1 and the support legs 3 are existing technologies, with their surfaces coated with insulating material to prevent conductivity and ensure accurate test results. The four support legs 3 are fixed at the four corners of the bottom of the worktable 1. An adjustment assembly 4 for adjusting the height of the entire device is installed between the four support legs 3. A test box 2 is installed at the center of the top of the worktable 1. The outer walls of both sides of the test box 2 have wire insertion holes. These holes must be large and not designed for a single cable specification. The interior of the test box 2 contains components for testing... The cable detector periodically applies a set voltage value to the insulation wire according to a certain pattern, while the conductor is grounded. This creates a voltage difference between the conductor and the insulation surface, allowing the detection of insulation defects. The top of the workbench 1 has rectangular slots on both sides of the detection box 2. The outer wall of the workbench 1 has two circular holes that connect to the two rectangular slots. Clamping components 7 are installed inside the rectangular slots. The clamping components 7 are used to clamp and support the cable. The clamping components 7 are aligned with the insertion hole. The circular holes have locking components 6 installed inside to enable the clamping components 7 to operate.

[0032] Furthermore, the bottom of the support leg 3 is fixed with casters 5, which are designed to facilitate movement.

[0033] Furthermore, both outer walls of the testing box 2 are provided with fixing rings 8 aligned with the wiring holes. A rubber membrane 9 is placed between the fixing rings 8 and the testing box 2. Multiple positioning holes are provided on the outer walls of both the fixing rings 8 and the rubber membrane 9. Fixing bolts are slidably installed on the inner walls of the positioning holes. The fixing rings 8 are fixed to the outer walls of the testing box 2 by the fixing bolts. Therefore, the fixing rings 8 are used to fix the rubber membrane 9 to the testing box 2, while ensuring no gaps are formed between the rubber membrane 9 and the testing box 2 to prevent leakage. A through hole coaxial with the wiring hole is provided on the outer wall of the rubber membrane 9. aperture The size should be much smaller than the socket. aperture When the cable is inserted into the through hole, the rubber diaphragm 9 undergoes elastic deformation, wrapping the cable to prevent leakage.

[0034] Furthermore, the adjustment assembly 4 includes a fixed plate 41, a base plate 43, and two linkage mechanisms. The four support legs 3 are all fixed on the outer wall of the fixed plate 41. The fixed plate 41 is located above the base plate 43. The linkage mechanisms are arranged between the fixed plate 41 and the base plate 43, and the two linkage mechanisms are symmetrical to each other. The adjustment assembly 4 is used to adjust the distance between the fixed plate 41 and the base plate 43, thereby realizing the height adjustment of the entire device.

[0035] Furthermore, the linkage mechanism includes a crossbar 42, two connecting rods 44, two connecting rods 45, two fixing blocks 46 and two fixing blocks 47. Each of the two fixing blocks 46 has a rotating hole at one end of connecting rod 44 and one end of connecting rod 45. The crossbar 42 rotates on the inner wall of the rotating hole. The two fixing blocks 46 are fixed to the bottom of the fixing plate 41, and the other end of connecting rod 44 is rotatably mounted on one outer wall of fixing block 46. The fixing blocks 47 are fixed to the top of the base plate 43, and the other end of connecting rod 45 is rotatably mounted on one outer wall of fixing block 47. A threaded rod 48 is rotatably mounted on the outer wall of one of the crossbars 42. One end of the threaded rod 48 passes through another crossbar 42. The threaded rod 48 is connected to the crossbar 42 it passes through by a thread. According to the above connection relationship, if the threaded rod 48 is rotated, the threaded rod 48 will drive one of the crossbars 42 to move through the threaded transmission. At this time, the two crossbars 42 move away from each other and move closer to each other. If the two crossbars 42 move away from each other, the clamping between the connecting rod 1 44 and the connecting rod 2 45 on the upper part will increase, thereby controlling the distance between the fixed plate 41 and the base plate 43 to increase.

[0036] Furthermore, the clamping assembly 7 includes two support plates 71, two movable plates 73, two guide rods 75, two clamping plates 72, and one clamping plate 74. The two support plates 71 are fixed to the top of the workbench 1, located on opposite sides of the rectangular groove. The two guide rods 75 are fixed at both ends to the outer walls of the two support plates 71. Two guide holes are formed on the outer wall of the movable plate 73, and the guide rods 75 are slidably mounted on the inner walls of the guide holes. The bottom of the movable plate 73 is equipped with the same centering mechanism 76. The clamping plate 74 is fixed to the top of one of the movable plates 73, and the two clamping plates 72 are fixed to the top of the other movable plate 73. V-shaped grooves are formed on the outer walls of the clamping plates 72 and 74 on opposite sides. Figure 4 The center line of the V-shaped groove has the center of the through hole. The clamping plate 2 74 is located between the two clamping plates 1 72. In this way, the clamping plate 2 74 and the clamping plate 1 72 are close to each other, which can clamp and support the cable.

[0037] Furthermore, the centering mechanism 76 includes two connecting rods 761 and a rotating plate 762. A fixing post 764 is fixed to the middle position of the bottom of the rotating plate 762. The fixing post 764 is rotatably mounted on the inner wall of the bottom of the rectangular groove. One end of each connecting rod 761 is rotatably engaged with both ends of the rotating plate 762, and the other end of each connecting rod 761 is rotatably mounted on the bottom of the moving plate 73. A connecting rod 763 for connection with the locking assembly 6 is rotatably mounted on the bottom of the rotating plate 762. Figure 7If the rotating plate 762 rotates counterclockwise, the rotating plate 762 pulls the two connecting rods 761, and the moving plate 73 on the two connecting rods 761 moves closer to each other, and the clamping plate 74 moves closer to the clamping plate 72.

[0038] Furthermore, the locking assembly 6 includes an adjusting mechanism, a pull rod 61, a circular plate 69, a spring 68, a movable cylinder 67, and two limiting rods 65. The pull rod 61 is slidably mounted on the inner wall of the circular hole, and one end of the pull rod 61 is rotatably engaged with one end of the connecting rod 763. The circular plate 69 is located outside the rectangular groove and fixed to the other end of the pull rod 61. The adjusting mechanism is mounted on the pull rod 61. The movable cylinder 67 is slidably sleeved on the outer wall of the pull rod 61 and is positioned between the circular plate 69 and the adjusting mechanism. The spring 68 is sleeved on the outer wall of the pull rod 61, and both ends of the spring 68 contact the movable cylinder 67 and the circular plate 69, respectively. The limiting rods 65 are fixed to the outer wall of the movable cylinder 67. Pulling the limiting rods 65 outward causes the movable cylinder 67 to move synchronously with the limiting rods 65. The movable cylinder 67 drives the pull rod 61 to move with the help of the spring 68. One end of the pull rod 61 is connected to the connecting rod 763. Rotate the rotating plate 762 counterclockwise. The rotating plate 762 pulls the two connecting rods 761. The moving plate 73 on the two connecting rods 761 moves closer to each other, that is, the clamping plate 74 and the clamping plate 72 move closer to each other until the clamping plate 74 and the clamping plate 72 clamp the cable.

[0039] Furthermore, the adjustment mechanism includes a movable plate 62. A mounting hole is provided in the middle of one side of the outer wall of the movable plate 62. A fixing cylinder 66 is fixed to the inner wall of the mounting hole. Two positioning ports 661, each adapted to a limiting rod 65, are provided at one end of the fixing cylinder 66. Two positioning ports 662, each adapted to a limiting rod 65, are also provided at the other end of the fixing cylinder 66. The length of the second positioning port 662 is longer than the length of the first positioning port 661. A guide hole and a threaded hole are respectively provided at both ends of one side of the outer wall of the movable plate 62. A guide rod 63 is slidably installed on the inner wall of the guide hole 63, one end of which is fixed to the worktable 1. A threaded post 64 is threadedly connected to the inner wall of the threaded hole, one end of which is rotatably installed on the worktable 1. A clamping plate 74 is also provided. Clamp the cable with clamping plate 72. If the limiting rod 65 does not disengage from positioning port 662, pull the limiting rod 65 outward to compress the spring 68. Then rotate the moving cylinder 67 to align the limiting rod 65 with positioning port 661. Then lock the limiting rod 65 into positioning port 661. If the pull rod 61 is still loose when the limiting rod 65 is locked into positioning port 661, the threaded column 64 can be rotated and combined with the guide rod 63 to move the fixing cylinder 66 of the moving plate 62 until the limiting rod 65 is tightly locked into positioning port 661.

[0040] Working principle: The device is moved to the designated location by the casters 5. Then, the threaded rod 48 is rotated, which drives one of the crossbars 42 to move through the threaded transmission, causing the two crossbars 42 to move away from each other. At the same time, the clamping between the connecting rods 44 and 45 increases, thereby increasing the distance between the fixed plate 41 and the base plate 43 until the base plate 43 touches the ground, lifting the casters 5 off the ground. In this state, the device cannot move. If the height is insufficient, the two crossbars 42 can continue to move away from each other to adjust the height. When the cable is inserted into the through hole, the rubber diaphragm 9 undergoes elastic deformation, wrapping the cable to prevent leakage. Pulling the limit rod 65 outward causes the moving cylinder 67 to move synchronously with the limit rod 65. The moving cylinder 67 drives the pull rod 6 with the help of the spring 68. 1. Move the lever 61. One end of the lever 61 is connected to the fourth link 763, causing the rotating plate 762 to rotate counterclockwise. The rotating plate 762 pulls the two third links 761, and the moving plate 73 on the two third links 761 moves closer to each other, that is, the clamping plate 74 and the clamping plate 72 move closer to each other until the clamping plate 74 and the clamping plate 72 clamp the cable. Then, pull the limiting rod 65 outward, the spring 68 is compressed, and then rotate the moving cylinder 67 to align the limiting rod 65 with the positioning port 661. Then, the limiting rod 65 is locked in the positioning port 661, thus completing the locking. This can lift and clamp cables of different diameters.

[0041] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online power frequency spark tester for cables, characterized in that: The workbench (1) includes a workbench (1) and four support legs (3). The four support legs (3) are fixed at the four corners of the bottom of the workbench (1). An adjustment assembly (4) is installed between the four support legs (3). A detection box (2) is installed at the middle of the top of the workbench (1). The outer walls of both sides of the detection box (2) are provided with insertion holes. A detector for detecting cables is installed inside the detection box (2). Rectangular slots are opened on both sides of the top of the workbench (1) at the detection box (2). Two round holes are opened on the outer peripheral wall of the workbench (1). The two round holes are connected to the two rectangular slots respectively. A clamping assembly (7) is installed inside the rectangular slots. The clamping assembly (7) is aligned with the insertion hole. A locking assembly (6) is installed inside the round hole. The locking assembly (6) includes an adjustment mechanism, a pull rod (61), a circular plate (69), a spring (68), a movable cylinder (67), and two limiting rods (65). The pull rod (61) is slidably mounted on the inner wall of the circular hole. One end of the pull rod (61) is rotated with one end of the connecting rod (763). The circular plate (69) is located outside the rectangular groove and fixed on the other end of the pull rod (61). The adjustment mechanism is mounted on the pull rod (61). The movable cylinder (67) is slidably sleeved on the outer wall of the pull rod (61) and is placed between the circular plate (69) and the adjustment mechanism. The spring (68) is sleeved on the outer wall of the pull rod (61). The two ends of the spring (68) are in contact with the movable cylinder (67) and the circular plate (69) respectively. The limiting rods (65) are fixed on the outer wall of the movable cylinder (67). The adjustment mechanism includes a movable plate (62). A mounting hole is provided in the middle of one side outer wall of the movable plate (62). A fixing cylinder (66) is fixed in the inner wall of the mounting hole. Two positioning ports (661) are provided at one end of the fixing cylinder (66) to match the limiting rod (65). Two positioning ports (662) are provided at one end of the fixing cylinder (66) to match the limiting rod (65). The length of the positioning port (662) is longer than the length of the positioning port (661). A guide hole and a threaded hole are provided at both ends of one side outer wall of the movable plate (62). A guide rod (63) is slidably installed in the inner wall of the guide hole. One end of the guide rod (63) is fixed on the worktable (1). A threaded column (64) is connected to the inner wall of the threaded hole by a thread. One end of the threaded column (64) is rotatably installed on the worktable (1).

2. The power frequency spark tester for online cable testing according to claim 1, characterized in that: The bottom of the support leg (3) is fixed with a caster wheel (5).

3. The power frequency spark tester for online cable testing according to claim 1, characterized in that: The outer walls of both sides of the test box (2) are provided with fixing rings (8) aligned with the plug holes. A rubber membrane (9) is provided between the fixing rings (8) and the test box (2). Multiple positioning holes are provided on the outer walls of the fixing rings (8) and the rubber membrane (9). Fixing bolts are slidably installed on the inner walls of the positioning holes. The fixing rings (8) are fixed to the outer walls of the test box (2) by fixing bolts. A through hole coaxial with the plug hole is provided on the outer wall of the rubber membrane (9).

4. The power frequency spark tester for online cable testing according to claim 1, characterized in that: The adjustment assembly (4) includes a fixed plate (41), a base plate (43) and two linkage mechanisms. The four support legs (3) are all fixed on the outer wall of the fixed plate (41). The fixed plate (41) is located above the base plate (43). The linkage mechanisms are arranged between the fixed plate (41) and the base plate (43), and the two linkage mechanisms are symmetrical to each other.

5. The power frequency spark tester for online cable testing according to claim 4, characterized in that: The linkage mechanism includes a crossbar (42), two connecting rods (44), two connecting rods (45), two fixing blocks (46) and two fixing blocks (47). The two fixing blocks (46), one end of the connecting rods (44) and one end of the connecting rods (45) are provided with rotating holes. The crossbar (42) rotates on the inner wall of the rotating hole. The two fixing blocks (46) are fixed to the bottom of the fixing plate (41). The other end of the connecting rods (44) is rotatably installed on the outer wall of one side of the fixing block (46). The fixing block (47) is fixed to the top of the base plate (43). The other end of the connecting rods (45) is rotatably installed on the outer wall of one of the crossbars (42). One end of the threaded rod (48) passes through the other crossbar (42). The threaded rod (48) and the crossbar (42) through which it passes are connected by threads.

6. The power frequency spark tester for online cable testing according to claim 1, characterized in that: The clamping assembly (7) includes two support plates (71), two movable plates (73), two guide rods (75), two clamping plates (72), and one clamping plate (74). The two support plates (71) are fixed on the top of the workbench (1). The two support plates (71) are located on both sides of the rectangular groove. The two guide rods (75) are fixed at both ends on the outer walls of the two support plates (71). The outer wall of the movable plate (73) has two guide holes. The guide rods (75) are slidably installed on the inner wall of the guide holes. The bottom of the movable plate (73) is equipped with the same centering mechanism (76). The clamping plate (74) is fixed on the top of one of the movable plates (73). The two clamping plates (72) are fixed on the top of the other movable plate (73). The outer walls of the clamping plates (72) and clamping plates (74) on opposite sides are provided with V-shaped grooves.

7. The power frequency spark tester for online cable testing according to claim 6, characterized in that: The centering mechanism (76) includes two connecting rods (761) and a rotating plate (762). A fixing post (764) is fixed at the middle position of the bottom of the rotating plate (762). The fixing post (764) is rotatably installed on the inner wall of the bottom of the rectangular groove. One end of the two connecting rods (761) forms a rotational engagement with the two ends of the rotating plate (762). The other end of the connecting rods (761) is rotatably installed at the bottom of the moving plate (73). A connecting rod (763) for connecting with the locking assembly (6) is rotatably installed at the bottom of the rotating plate (762).

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