Cable joint voltage withstanding detection device and cable joint

Abstract

The invention discloses a cable joint voltage-withstanding detection device and a cable joint, and relates to the technical field of voltage-withstanding detection, the cable joint voltage-withstanding detection device comprises a voltage-withstanding detector main body, a correction positioning member is arranged between a movable joint and a positioning joint, and the cable joint is limited through the correction positioning member. By arranging the correction positioning piece, one end of the cable connector is placed on the inner side of the positioning ring, then the telescopic air cylinder is started, and the multiple insulation clamping plates move towards the circle center of the positioning connector through contraction of the telescopic air cylinder, so that the cable connector is rapidly limited; at the moment, the movable connector moves towards the positioning connector through the fixed-distance moving piece, one end of the cable connector is inserted into the inner side of the positioning connector, at the moment, the first movable sliding block continues to move, the other end of the cable connector can be inserted into the inner side of the movable connector, and the clamped position of the cable connector does not need to be independently adjusted in the whole process; the operation is simple, and the detection efficiency of the cable joint is improved.

Description

Technical Field

[0001] This invention relates to the field of withstand voltage testing technology, specifically a cable joint withstand voltage testing device and a cable joint. Background Technology

[0002] In fields such as power transmission, industrial control, and new energy vehicles, cable joints, as core components connecting cables and equipment, directly determine the safe operation of the entire electrical system through their insulation performance and withstand voltage stability. During production, transportation, and installation, cable joints are prone to hidden defects such as insulation layer scratches, poor internal conductor contact, and aging sealant. If these defects are not detected in time, they may lead to breakdown, leakage, and other faults under high-voltage conditions after being put into use, causing equipment shutdown, fire, or even electric shock accidents. Therefore, before cable joints leave the factory or are installed, their electrical performance must be verified through withstand voltage testing. Currently, the withstand voltage testing of cable joints mainly relies on traditional testing devices. The core principle is to connect both ends of the cable joint to a withstand voltage tester, apply the rated high voltage and maintain it for a set time, and observe whether insulation breakdown, leakage current exceeding the standard, or other phenomena occur, thereby determining whether the joint is qualified.

[0003] With the intelligent operation and maintenance of power systems and the rapid development of the new energy industry, higher requirements have been placed on the accuracy, efficiency and reliability of cable joint testing. Especially with the gradual integration of fault prediction concepts into the electrical equipment operation and maintenance system, traditional cable joint withstand voltage testing devices can no longer meet the comprehensive needs of "high-precision testing, high-efficiency operation, risk prediction, and high safety protection". Generally, when connecting cable joints to withstand voltage testers, workers cannot quickly snap the cable joints into the conductive plugs in the withstand voltage testers, which will affect the testing efficiency. At the same time, when snapping the cable joints, insufficient connection between the cable joints and the conductive plugs will also affect the accuracy of the test data. Summary of the Invention

[0004] The purpose of this invention is to provide a cable joint withstand voltage testing device and a cable joint in order to solve the problems of low testing efficiency and low testing accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cable joint withstand voltage testing device, comprising a withstand voltage tester body, a support frame mounted on the top of the withstand voltage tester body, a positioning joint mounted on the inner side of the support frame, a first movable slider slidably connected to the top of the support frame, a fixed-distance moving part connected to the support frame being provided on the top of the first movable slider, a movable joint being installed at the bottom of the first movable slider, the movable joint and the positioning joint being at the same horizontal height, and the insertion holes of the movable joint and the positioning joint facing opposite directions, a correction positioning part being provided between the movable joint and the positioning joint, and the cable joint being limited by the correction positioning part.

[0006] As a further embodiment of the present invention: the movable connector is electrically connected to the main body of the withstand voltage tester via a wire, and the positioning connector is connected to the ground wire via a wire.

[0007] As a further embodiment of the present invention: the correction and positioning component includes a second movable slider slidably connected to the top of the support frame; a telescopic spring connected to the first movable slider is provided on one side of the second movable slider; a limit frame is installed at the bottom end of the second movable slider; a positioning ring located between the movable joint and the positioning joint is installed at the bottom end of the limit frame; a first U-shaped frame is installed on the outer wall of the positioning ring; multiple insulating clamps extending to the outer side of the positioning ring are provided on the inner side of the positioning ring, and the multiple insulating clamps are evenly distributed along the center of the positioning ring; a telescopic cylinder is installed at the bottom of the first U-shaped frame; the telescopic cylinder... The first U-shaped bracket has a U-shaped insert rod that is slidably connected to the limiting frame at the output end. A groove is provided on the side of the first U-shaped bracket away from the positioning ring. An inclined guide rail is slidably connected to the inner side of the groove. The end of the insulating clamp away from the center of the positioning ring is rotatably connected to a swing frame via a rotating shaft. One end of the swing frame is rotatably connected to a connecting rod via a rotating shaft. A movable ring is provided on the connecting rod between the positioning ring and the positioning connector. A second U-shaped bracket is installed on the outer wall of the movable ring. A guide pin is provided on one side of the second U-shaped bracket. The guide pin is slidably connected to the inner side of the inclined guide rail. A contact energizing unit is provided between the U-shaped insert rod and the first U-shaped bracket.

[0008] As a further embodiment of the present invention: the movable joint, the positioning ring, and the movable ring are coaxial with the center of the positioning joint.

[0009] As a further aspect of the present invention: the positioning ring is provided with a through hole that matches the insulating clamp, and the horizontal height of the inclined guide rail near the positioning ring is greater than the horizontal height of the inclined guide rail near the second U-shaped frame.

[0010] As a further embodiment of the present invention: the contact energizing unit includes a corrugated telescopic tube installed between the U-shaped plug and the first U-shaped frame, and the corrugated telescopic tube is located outside the output end of the telescopic cylinder. The bottom of the U-shaped plug is provided with a first contact piece located inside the corrugated telescopic tube, and the top of the first U-shaped frame is provided with a second contact piece located inside the corrugated telescopic tube.

[0011] As a further embodiment of the present invention: the fixed-distance moving component includes a positioning frame installed on one side of the support frame; a transverse connecting block located above the support frame is installed on the top of the first movable slider; one end of the positioning frame is rotatably connected to a spur gear via a rotating shaft; an extension frame is installed at the bottom of the spur gear; a turntable is provided at the bottom of the extension frame; a limit groove is formed on the inner side of the turntable; an adjusting screw is rotatably connected to the inner side of the limit groove via a bearing; a threaded block that is slidably connected to the limit groove is movably sleeved on the outer side of the adjusting screw; an adjusting pin is installed at the bottom of the threaded block; a displacement groove is formed on the top of the transverse connecting block; the adjusting pin is slidably connected to the inner side of the displacement groove; an electric telescopic rod is installed on the side of the positioning frame away from the spur gear; a rack that meshes with the spur gear is connected to the output end of the electric telescopic rod; a return spring connected to the positioning frame is provided on one side of the rack.

[0012] As a further aspect of the present invention: the number of teeth on one side of the rack is one-quarter of the number of teeth on the outer side of the spur gear, and the spur gear drives the turntable to rotate 90 degrees by the rack moving the spur gear.

[0013] As a further embodiment of the present invention: the top of the turntable is provided with a scale line located on one side of the limiting groove, and the zero scale line is aligned with the center of the turntable.

[0014] A cable connector includes an insulation layer, an internal hexagonal locking block disposed on the inner side of the insulation layer, a conductor mounted on the bottom end of the internal hexagonal locking block, an outer semiconductive layer disposed on the outer side of the insulation layer, a grounding sleeve disposed on the outer side of the outer semiconductive layer, a positioning ring disposed on the bottom end of the grounding sleeve located outside the outer semiconductive layer, an arc-suppressing chamber disposed on the inner side of the end of the insulation layer away from the internal hexagonal locking block, and a threaded base disposed on the inner side of the internal hexagonal locking block.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By setting a calibration positioning component, one end of the cable connector is placed inside the positioning ring. Then, the telescopic cylinder is activated. The contraction of the telescopic cylinder moves multiple insulating clamps toward the center of the positioning joint, thereby quickly limiting the cable connector. At this time, there is still a gap between the two ends of the cable connector and the movable and positioning joints. The fixed-distance moving component moves the movable joint toward the positioning joint. At this time, the second movable slider moves synchronously with the first movable slider under the action of the telescopic spring, so that one end of the cable connector is inserted into the inside of the positioning joint. The first movable slider continues to move, so that the first movable slider moves relative to the second movable slider. During this process, the telescopic spring contracts, so that the other end of the cable connector is inserted into the inside of the movable joint. The whole process does not require separate adjustment of the clamped position of the cable connector, which is simple to operate and also improves the detection efficiency of cable connectors.

[0017] 2. By setting up a contact energizing unit, when the telescopic cylinder retracts, the first contact piece contacts the second contact piece, thus energizing the electric telescopic rod. This causes the electric telescopic rod to drive the rack to move, which in turn causes the rack to rotate the spur gear, thereby achieving the orderly operation of the correction positioning component and the distance moving component.

[0018] 3. By setting a fixed-distance moving part, first rotate the adjusting screw. The rotation of the adjusting screw causes the threaded block to move along the limiting groove, thereby adjusting the distance from the threaded block to the center of the turntable. Since the initial distance between the movable joint and the positioning joint is fixed, the fixed distance between the movable joint and the positioning joint minus the distance from the threaded block to the center of the turntable is the length of the cable joint. Thus, the distance between the movable joint and the positioning joint can be adjusted according to the length of the cable joint. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the inner structure of the support frame of the present invention;

[0021] Figure 3 This is a schematic diagram showing the connection between the positioning ring and the second movable slider of the present invention;

[0022] Figure 4 This is a schematic diagram showing the connection between the positioning ring and the movable ring of the present invention;

[0023] Figure 5 This is a schematic diagram of the inner structure of the corrugated expansion tube of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the fixed-distance moving component of the present invention;

[0025] Figure 7 This is a schematic diagram showing the connection between the turntable and the horizontal connecting block of the present invention;

[0026] Figure 8 This is a schematic diagram of the cable connector structure of the present invention;

[0027] Figure 9 This is a cross-sectional view of the cable connector of the present invention.

[0028] In the diagram: 1. Main body of the withstand voltage tester; 2. Support frame; 3. Positioning joint; 4. First movable slider; 5. Positioning frame; 6. Electric telescopic rod; 7. Movable joint; 8. Second movable slider; 9. Telescopic spring; 10. Turntable; 11. Adjusting screw; 12. Transverse connecting block; 13. Positioning ring; 14. Movable ring; 15. First U-shaped frame; 16. Second U-shaped frame; 17. Limiting frame; 18. U-shaped insert rod; 19. Corrugated telescopic tube; 20. Inclined guide rail; 21. Guide pin; 22. 23. Telescopic cylinder; 24. Connecting rod; 25. Positioning bracket; 26. Insulating clamp; 27. Slide groove; 28. First contact piece; 29. ​​Second contact piece; 30. Limiting groove; 31. Extension frame; 32. Spur gear; 33. Rack; 34. Return spring; 35. Threaded block; 36. Displacement groove; 37. Insulating layer; 38. Positioning ring; 39. Grounding sleeve; 40. Arc suppression chamber; 41. Threaded base; 42. Hexagonal socket block; 43. Outer semi-conductive layer; 44. Conductor; 45. Adjusting pin. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0031] Please see Figures 1-9 In this embodiment of the invention, a cable joint withstand voltage testing device and a cable joint are provided, including a withstand voltage tester body 1. A support frame 2 is installed on the top of the withstand voltage tester body 1. A positioning joint 3 is installed on the inner side of the support frame 2. A first movable slider 4 is slidably connected to the top of the support frame 2. A fixed-distance moving part connected to the support frame 2 is provided on the top of the first movable slider 4. A movable joint 7 is installed at the bottom of the first movable slider 4. The movable joint 7 and the positioning joint 3 are at the same horizontal height, and the insertion holes of the movable joint 7 and the positioning joint 3 face opposite directions. A correction positioning part is provided between the movable joint 7 and the positioning joint 3 to limit the cable joint.

[0032] Among them, the movable connector 7 is electrically connected to the main body 1 of the withstand voltage tester via a wire, and the positioning connector 3 is connected to the ground wire via a wire.

[0033] In this embodiment, the cable connector is first placed between the movable connector 7 and the positioning connector 3. Then, the calibration positioning device is activated to limit the cable connector. At the same time, the center of the cable connector is made coaxial with the center of the movable connector 7 and the positioning connector 3. After the calibration positioning device clamps the cable connector, the distance moving device will operate. At this time, the two ends of the cable connector are inserted into the inner side of the movable connector 7 and the positioning connector 3 respectively through the operation of the distance moving device. Then, the cable connector between the movable connector 7 and the positioning connector 3 is pressurized by operating the withstand voltage tester body 1. Based on whether insulation breakdown occurs or whether the leakage current exceeds the preset threshold during the test, the connector is directly judged as "qualified" or "unqualified". After the test is completed, the withstand voltage tester body 1 is turned off and the cable connector is removed by operating the calibration positioning device.

[0034] Please refer to this carefully. Figure 2 , Figure 3 , Figure 4 , Figure 5 The positioning and alignment component includes a second movable slider 8 slidably connected to the top of the support frame 2. A telescopic spring 9 connected to a first movable slider 4 is provided on one side of the second movable slider 8. A limit frame 17 is installed at the bottom of the second movable slider 8. A positioning ring 13 located between the movable joint 7 and the positioning joint 3 is installed at the bottom of the limit frame 17. A first U-shaped frame 15 is installed on the outer wall of the positioning ring 13. Multiple insulating clamps 25 extending to the outer side of the positioning ring 13 are provided on the inner side of the positioning ring 13, and the multiple insulating clamps 25 are evenly distributed along the center of the positioning ring 13. A telescopic cylinder 22 is installed at the bottom of the first U-shaped frame 15. The output end of the telescopic cylinder 22 is connected to a spring that slides with the limit frame 17. The connected U-shaped plug 18 has a groove 26 on the side of the first U-shaped frame 15 away from the positioning ring 13. The inner side of the groove 26 is slidably connected to the inclined guide rail 20. The end of the insulating clamp 25 away from the center of the positioning ring 13 is rotatably connected to the swing frame 24 through a rotating shaft. The end of the swing frame 24 is rotatably connected to the connecting rod 23 through a rotating shaft. The connecting rod 23 is provided with a movable ring 14 located between the positioning ring 13 and the positioning connector 3. The outer wall of the movable ring 14 is equipped with a second U-shaped frame 16. The side of the second U-shaped frame 16 is provided with a guide pin 21. The guide pin 21 is slidably connected to the inner side of the inclined guide rail 20. A contact energizing unit is provided between the U-shaped plug 18 and the first U-shaped frame 15.

[0035] The contact energizing unit includes a corrugated telescopic tube 19 installed between the U-shaped plug 18 and the first U-shaped frame 15, and the corrugated telescopic tube 19 is located outside the output end of the telescopic cylinder 22. The bottom of the U-shaped plug 18 is provided with a first contact piece 27 located inside the corrugated telescopic tube 19, and the top of the first U-shaped frame 15 is provided with a second contact piece 28 located inside the corrugated telescopic tube 19. The first contact piece 27 is electrically connected to the electric telescopic rod 6 through a wire, and the second contact piece 28 is electrically connected to an external power supply through a wire.

[0036] Among them, the movable joint 7, the positioning ring 13, the movable ring 14 and the positioning joint 3 are coaxial. The positioning ring 13 is provided with a through hole that matches the insulating clamp 25. The horizontal height of the inclined guide rail 20 near the positioning ring 13 is greater than the horizontal height of the inclined guide rail 20 near the second U-shaped frame 16.

[0037] In this embodiment, one end of the cable connector is placed inside the positioning ring 13. Then, the telescopic cylinder 22 is activated. The retraction of the telescopic cylinder 22 causes the U-shaped insert 18 to move the inclined guide rail 20 downwards. During this downward movement, the inclined guide rail 20 guides the guide pin 21, causing the second U-shaped frame 16 to move horizontally towards the first U-shaped frame 15. This causes the movable ring 14 to move towards the positioning ring 13. During this movement, the movable ring 14 presses one end of the positioning frame 24 via the connecting rod 23, causing the positioning frame 24 to push the insulating clamps 25 to move. This causes multiple insulating clamps 25 to move towards the center of the positioning connector 3, thereby positioning the cable connector. The cable connector is quickly stopped. At this point, there is still a gap between the two ends of the cable connector and the movable connector 7 and the positioning connector 3. The movable connector 7 is moved towards the positioning connector 3 by the fixed-distance moving part. At this time, the second movable slider 8 will move synchronously with the first movable slider 4 under the action of the telescopic spring 9, so that one end of the cable connector is inserted into the inside of the positioning connector 3. Then, the first movable slider 4 continues to move, so that the first movable slider 4 moves relative to the second movable slider 8. During this process, the telescopic spring 9 retracts, so that the other end of the cable connector is inserted into the inside of the movable connector 7. The whole process does not require separate adjustment of the clamped position of the cable connector, which is simple to operate and also improves the detection efficiency of the cable connector.

[0038] Please refer to this carefully. Figure 2 , Figure 6 , Figure 7The fixed-distance moving component includes a positioning frame 5 installed on one side of the support frame 2. A transverse connecting block 12 located above the support frame 2 is installed on the top of the first movable slider 4. One end of the positioning frame 5 is rotatably connected to a spur gear 31 via a rotating shaft. An extension frame 30 is installed at the bottom of the spur gear 31. A turntable 10 is provided at the bottom of the extension frame 30. A limit groove 29 is opened on the inner side of the turntable 10. An adjusting screw 11 is rotatably connected to the inner side of the limit groove 29 via a bearing. A threaded block 34 that is slidably connected to the limit groove 29 is movably sleeved on the outer side of the adjusting screw 11. An adjusting pin 44 is installed at the bottom of the threaded block 34. A displacement groove 35 is opened on the top of the transverse connecting block 12. The adjusting pin 44 is slidably connected to the inner side of the displacement groove 35. An electric telescopic rod 6 is installed on the side of the positioning frame 5 away from the spur gear 31. A rack 32 that meshes with the spur gear 31 is connected to the output end of the electric telescopic rod 6. A return spring 33 connected to the positioning frame 5 is provided on one side of the rack 32.

[0039] The number of teeth on one side of the rack 32 is one-quarter of the number of teeth on the outside of the spur gear 31. The rack 32 drives the spur gear 31 to rotate, thereby causing the spur gear 31 to rotate the turntable 10 by 90 degrees. The top of the turntable 10 is provided with a scale line located on one side of the limiting groove 29, and the zero scale line is aligned with the center of the turntable 10.

[0040] In this embodiment, the adjusting screw 11 is rotated first. The rotation of the adjusting screw 11 causes the threaded block 34 to move along the limiting groove 29, thereby adjusting the distance between the threaded block 34 and the center of the turntable 10. Since the initial distance between the movable joint 7 and the positioning joint 3 is fixed, the fixed distance between the movable joint 7 and the positioning joint 3 minus the distance between the threaded block 34 and the center of the turntable 10 equals the length of the cable connector. Thus, the distance between the movable joint 7 and the positioning joint 3 can be adjusted according to the length of the cable connector. When the telescopic cylinder 22 retracts, the first contact piece 27 contacts the second contact piece 28, thereby enabling the electric telescopic rod 6 to... The electric operation causes the electric telescopic rod 6 to move the rack 32, which in turn causes the rack 32 to rotate the spur gear 31. When the spur gear 31 rotates, it drives the turntable 10 to rotate. At this time, the turntable 10 drives the adjusting pin 44 to rotate. Since the adjusting pin 44 is slidably connected to the transverse connecting block 12 through the shifting groove 35, the adjusting pin 44 can move the transverse connecting block 12 horizontally as the turntable 10 rotates. This allows the movable joint 7 to move toward the positioning joint 3. During the movement, both ends of the cable joint can be inserted into the movable joint 7 and the positioning joint 3.

[0041] Please refer to this carefully. Figure 8 , Figure 9A cable joint withstand voltage testing device further includes an insulation layer 36, an internal hexagonal locking block 41 disposed on the inner side of the insulation layer 36, a conductor 43 installed at the bottom end of the internal hexagonal locking block 41, an outer semi-conductive layer 42 disposed on the outer side of the insulation layer 36, a grounding sleeve 38 disposed on the outer side of the outer semi-conductive layer 42, a positioning ring 37 located outside the outer semi-conductive layer 42 disposed at the bottom end of the grounding sleeve 38, an arc extinguishing chamber 39 disposed on the inner side of the end of the insulation layer 36 away from the internal hexagonal locking block 41, and a threaded base 40 disposed on the inner side of the internal hexagonal locking block 41.

[0042] In this embodiment, the positioning ring 37 is used to determine whether the cable connector and the cable connector base are installed in place, the outer semiconductive layer 42 is used to achieve continuous shielding, and the connection between the grounding sleeve 38 and the ground wire and the arc suppression chamber 39 are used to eliminate the electric arc generated by the insertion and removal of the cable connector to ensure the safe operation of the cable connector during use.

[0043] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cable joint withstand voltage testing device, comprising a withstand voltage tester body (1), characterized in that, The top of the main body (1) of the withstand voltage tester is equipped with a support frame (2), and the inner side of the support frame (2) is equipped with a positioning connector (3). The top of the support frame (2) is slidably connected to a first movable slider (4). The top of the first movable slider (4) is provided with a fixed-distance moving part connected to the support frame (2). The bottom of the first movable slider (4) is equipped with a movable connector (7). The movable connector (7) and the positioning connector (3) are at the same horizontal height, and the insertion holes of the movable connector (7) and the positioning connector (3) face opposite directions. A correction positioning part is provided between the movable connector (7) and the positioning connector (3) to limit the cable connector.

2. The cable joint withstand voltage testing device according to claim 1, characterized in that, The movable connector (7) is electrically connected to the main body (1) of the withstand voltage tester via a wire, and the positioning connector (3) is connected to the ground wire via a wire.

3. The cable joint withstand voltage testing device according to claim 2, characterized in that, The correction positioning component includes a second movable slider (8) slidably connected to the top of the support frame (2). A telescopic spring (9) connected to the first movable slider (4) is provided on one side of the second movable slider (8). A limit frame (17) is installed at the bottom end of the second movable slider (8). A positioning ring (13) located between the movable joint (7) and the positioning joint (3) is installed at the bottom end of the limit frame (17). A first U-shaped frame (15) is installed on the outer wall of the positioning ring (13). Multiple insulating clamps (25) extending to the outer side of the positioning ring (13) are provided on the inner side of the positioning ring (13), and the multiple insulating clamps (25) are evenly distributed along the center of the positioning ring (13). A telescopic cylinder (22) is installed at the bottom of the first U-shaped frame (15). The output end of the telescopic cylinder (22) is connected to a sliding connection with the limit frame (17). The U-shaped plug (18) is connected to the first U-shaped frame (15). A groove (26) is provided on the side of the first U-shaped frame (15) away from the positioning ring (13). An inclined guide rail (20) is slidably connected to the inner side of the groove (26). A swing frame (24) is rotatably connected to the end of the insulating clamp (25) away from the center of the positioning ring (13) through a rotating shaft. A connecting rod (23) is rotatably connected to the end of the swing frame (24) through a rotating shaft. A movable ring (14) is provided on the connecting rod (23) between the positioning ring (13) and the positioning connector (3). A second U-shaped frame (16) is installed on the outer wall of the movable ring (14). A guide pin (21) is provided on one side of the second U-shaped frame (16). The guide pin (21) is slidably connected to the inner side of the inclined guide rail (20). A contact energizing unit is provided between the U-shaped plug (18) and the first U-shaped frame (15).

4. The cable joint withstand voltage testing device according to claim 3, characterized in that, The movable joint (7), positioning ring (13), movable ring (14) and positioning joint (3) are coaxial.

5. The cable joint withstand voltage testing device according to claim 3, characterized in that, The positioning ring (13) is provided with a through hole that matches the insulating clamp (25). The horizontal height of the inclined guide rail (20) near the positioning ring (13) is greater than the horizontal height of the inclined guide rail (20) near the second U-shaped frame (16).

6. The cable joint withstand voltage testing device according to claim 3, characterized in that, The contact energizing unit includes a corrugated telescopic tube (19) installed between the U-shaped plug (18) and the first U-shaped frame (15), and the corrugated telescopic tube (19) is located outside the output end of the telescopic cylinder (22). The bottom of the U-shaped plug (18) is provided with a first contact piece (27) located inside the corrugated telescopic tube (19), and the top of the first U-shaped frame (15) is provided with a second contact piece (28) located inside the corrugated telescopic tube (19).

7. The cable joint withstand voltage testing device according to claim 1, characterized in that, The fixed-distance moving component includes a positioning frame (5) installed on one side of the support frame (2). A transverse connecting block (12) located above the support frame (2) is installed on the top of the first movable slider (4). One end of the positioning frame (5) is rotatably connected to a spur gear (31) via a rotating shaft. An extension frame (30) is installed at the bottom of the spur gear (31). A turntable (10) is provided at the bottom of the extension frame (30). A limit groove (29) is opened on the inner side of the turntable (10). An adjusting screw (11) is rotatably connected to the inner side of the limit groove (29) via a bearing. The adjusting screw (11) The outer side of the positioning frame (5) is movably sleeved with a threaded block (34) that is slidably connected to the limiting groove (29). The bottom of the threaded block (34) is equipped with an adjusting pin (44). The top of the transverse connecting block (12) is provided with a shifting groove (35). The adjusting pin (44) is slidably connected to the inner side of the shifting groove (35). An electric telescopic rod (6) is installed on the side of the positioning frame (5) away from the spur gear (31). The output end of the electric telescopic rod (6) is connected to a rack (32) that meshes with the spur gear (31). A return spring (33) connected to the positioning frame (5) is provided on one side of the rack (32).

8. The cable joint withstand voltage testing device according to claim 7, characterized in that, The number of teeth on one side of the rack (32) is one-quarter of the number of teeth on the outside of the spur gear (31). The rack (32) drives the spur gear (31) to rotate, thereby causing the spur gear (31) to rotate the turntable (10) by ninety degrees.

9. A cable joint withstand voltage testing device according to claim 7, characterized in that, The top of the turntable (10) is provided with a scale line located on one side of the limiting groove (29), and the zero scale line is aligned with the center of the turntable (10).

10. A cable joint, tested using the cable joint withstand voltage testing device according to any one of claims 1-9, characterized in that, The device includes an insulating layer (36), an internal hexagonal locking block (41) is provided on the inner side of the insulating layer (36), a conductor (43) is installed at the bottom end of the internal hexagonal locking block (41), an outer semiconductive layer (42) is provided on the outer side of the insulating layer (36), a grounding sleeve (38) is provided on the outer side of the outer semiconductive layer (42), a positioning ring (37) located on the outer side of the outer semiconductive layer (42) is provided at the bottom end of the grounding sleeve (38), an arc extinguishing chamber (39) is provided on the inner side of the end of the insulating layer (36) away from the internal hexagonal locking block (41), and a threaded base (40) is provided on the inner side of the internal hexagonal locking block (41).

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