Joint high pressure pulse fatigue test device

Abstract

The application discloses a kind of joint high-pressure pulse fatigue test devices, it is related to joint detection technical field, including base and detection joint, the upper end face left and right sides of the base are fixedly connected with fixed frame, the surface of the fixed frame is fixedly installed with drive cylinder, the output end of the drive cylinder is detachably connected with mounting plate, the surface of the mounting plate is fixedly installed with drive motor, the upper end face middle part of the base is provided with processing table, the inside of the processing table is provided with high-pressure pulse unit;The application is arranged drive cylinder and drive motor respectively in the both sides of base, the independent application or synchronous coupling application of axial tensile load and around shaft torsional load of the cable of two ends of detection joint is realized, while cooperating high-pressure pulse unit works, so that detection joint is subjected to mechanical composite stress while bearing electrical fatigue stress, and the real service working condition of cable joint in actual laying environment is completely reproduced.

Description

Technical Field

[0001] This invention relates to the field of joint testing technology, specifically a joint high-voltage pulse fatigue testing device. Background Technology

[0002] Cable joints are critical components in power transmission and distribution systems used to connect two cable sections. Their main functions are to achieve electrical connection, insulation restoration, and sealing protection of the cable conductors. In practical engineering applications, cable joints not only have to withstand the electrical stress of long-term operating voltage, but also inevitably suffer from continuous or alternating mechanical stress caused by factors such as cable weight, soil settlement, thermal expansion and contraction, and bending of the laying environment. Currently, routine quality inspections of cable joints often focus on single-dimensional tests, such as independent withstand voltage tests or static mechanical tensile tests.

[0003] Existing fatigue testing equipment typically only lays the joint flat and applies a high-voltage pulse when conducting pulse tests on cable joints, ignoring the tensile and torsional effects on the cables at both ends of the joint after actual installation. Due to the lack of a composite test method that applies controllable tensile and torsional loads to the joint while applying a high-voltage pulse, products that pass conventional testing often experience slippage, bulging, or even premature breakdown failure during actual installation and operation due to the combined stress. Therefore, existing testing methods are insufficient to comprehensively and accurately assess the service life of cable joints under real-world operating conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage pulse fatigue testing device for joints to solve the problems mentioned in the background.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage pulse fatigue testing device for a joint, comprising a base and a testing joint. A fixing frame is fixedly connected to both the left and right sides of the upper surface of the base. A drive cylinder is fixedly mounted on the surface of the fixing frame. A mounting plate is detachably connected to the output end of the drive cylinder. A drive motor is fixedly mounted on the surface of the mounting plate. A connecting part is fixedly connected to the output end of the drive motor. A processing table is provided in the middle of the upper surface of the base. A high-voltage pulse unit is provided inside the processing table. A support platform is fixedly connected to the upper side of the base inside the processing table. A fixing frame is detachably connected to the upper surface of the support platform. Cables are connected to both ends of the testing joint. The two cables extend from the testing joint to the left and right sides. The connecting parts on the left and right sides are detachably connected to the ends of the cables on the left and right sides, respectively. Two sets of drive motors and drive cylinders are provided, symmetrically arranged along the testing joint. A testing mechanism is provided inside the fixing frame.

[0006] Preferably, the detection mechanism includes a connecting block and several arc-shaped locking blocks. The detection connector is detachably connected to the inside of the connecting block. Two sets of tensile detection rods are fixedly connected to the front and rear sides of the connecting block. Annular sleeves are detachably connected to the left and right sides of the connecting block. Several sliding grooves are fixedly opened inside the annular sleeves. Limiting sliders are fixedly connected to the surface of the arc-shaped locking blocks. The limiting sliders are slidably connected to the inside of the sliding grooves. A torsion detection rod is fixedly connected to the middle of the arc surface of the arc-shaped locking blocks.

[0007] Preferably, a limiting block is fixedly connected inside the fixed frame, the connecting block is slidably connected inside the limiting block, the limiting slider is T-shaped, a return spring is provided at the connection between the limiting slider and the slide groove, the slide groove is in contact with the cable surface, and a total of eight sets of slide grooves are provided, four sets of slide grooves are arranged in a ring when in contact with the cable surface.

[0008] Preferably, the upper left and right sides of the support platform are provided with a ring frame, the inside of the ring frame is provided with four sets of first air valves and four sets of second air valves, and the front and rear sides of the inside of the fixed frame are provided with a third air valve. The surfaces of the first air valve, the second air valve and the third air valve are provided with contact points, and the first air valve, the second air valve and the third air valve trigger pneumatic signals through the contact points. When the test joint is stretched and slips out, the tensile test rod moves with the test joint and triggers the first pneumatic signal; When the detection joint causes the cable to twist and bulge, the torsion detection rod is lifted by the bulge and triggers the second pneumatic signal; The tensile detection rod and the torsion detection rod work independently. When tensile slippage and torsion bulging occur simultaneously, the torsion detection rod is lifted up while moving with the connecting block, triggering the third pneumatic signal.

[0009] Preferably, a controller is provided at the front end of the base, and a warning light is provided on the surface of the base. The first pneumatic signal, the second pneumatic signal, and the third pneumatic signal are all transmitted to the controller through an insulated hose. The controller is equipped with a pneumatic-electric conversion switch to control the warning light to issue an alarm.

[0010] Preferably, the controller performs the following control based on the received pneumatic signal: Upon receiving the first pneumatic signal, if a tensile failure is determined, the warning light will output a first-level warning. Upon receiving the second pneumatic signal, a torsional failure is determined, and the warning light outputs a second-level warning. Upon receiving a third pneumatic signal, a composite failure is determined, and the controller stops the drive motor and drive cylinder from working, while the warning light outputs the highest level alarm. When the displacement of the connecting block exceeds the preset limit value, the controller controls the drive motor and drive cylinder to stop working and cuts off the high-voltage pulse unit.

[0011] Preferably, the base has several legs on its lower side, and the upper surface of the base is fixedly connected to the left and right sides with limiting grooves, and the mounting plate is slidably connected to the inside of the limiting grooves.

[0012] Preferably, both the detection mechanism and the connecting part are made of insulating engineering materials. The output end of the high-voltage pulse unit is electrically connected to the metal core of the cable. The high-voltage pulse is conducted to the detection joint through the cable core to apply a pulse fatigue load to the joint.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention achieves the independent or synchronous coupling application of axial tensile load and torsional load on both ends of the cable of the test connector by arranging drive cylinders and drive motors on both sides of the base. At the same time, it works in conjunction with a high-voltage pulse unit, so that the test connector is subjected to mechanical composite stress while bearing electrical fatigue stress, thus fully replicating the real service conditions of the cable connector in the actual laying environment.

[0014] This invention utilizes connecting blocks and arc-shaped locking blocks on the surface of the test joint to cooperate with tensile and torsion test rods for tensile and torsion testing. By establishing the mechanical spatial correspondence between the tensile test rod and the third air valve, the torsion test rod and the first air valve, and the combined position of the torsion test rod in its moving state and the second air valve, the invention achieves physical differentiation of three defect modes: tensile failure, torsion failure, and combined failure. Furthermore, by using a controller to map different pneumatic signals into different levels of graded early warning responses, the invention further improves the quality inspection effect of the joint. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a high-voltage pulse fatigue testing device for joints proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the processing table proposed in this invention; Figure 3 This is a schematic diagram of the connecting block and the annular sleeve proposed in this invention; Figure 4 This is a schematic diagram of the fixed frame structure proposed in this invention; Figure 5 This is a schematic diagram of the arc-shaped card block proposed in this invention; Figure 6 This is a schematic diagram of the annular sleeve structure proposed in this invention; Figure 7 This is a front view of the testing mechanism proposed in this invention; Figure 8 This is a top view of the detection mechanism proposed in this invention; In the diagram: 1. Base; 2. Support leg; 3. Controller; 4. Processing table; 5. Fixing frame; 6. Limiting groove; 7. Mounting plate; 8. Drive motor; 9. Connecting part; 10. Warning light; 11. Support platform; 12. Fixing frame; 13. Limiting block; 14. Detection connector; 15. First air valve; 16. Second air valve; 17. Third air valve; 18. Drive cylinder; 19. Ring frame; 100. Detection mechanism; 101. Connecting block; 102. Tensile detection rod; 103. Ring sleeve; 104. Slide groove; 105. Arc-shaped locking block; 106. Torsion detection rod; 107. Limiting slider. Detailed Implementation

[0016] like Figures 1 to 8 As shown, the present invention provides a technical solution for a high-voltage pulse fatigue testing device for a joint: A high-voltage pulse fatigue testing device for a joint includes a base 1 and a testing joint 14. Fixing frames 5 are fixedly connected to the left and right sides of the upper end face of the base 1. A drive cylinder 18 is fixedly mounted on the surface of the fixing frame 5. A mounting plate 7 is detachably connected to the output end of the drive cylinder 18. A drive motor 8 is fixedly mounted on the surface of the mounting plate 7. A connecting part 9 is fixedly connected to the output end of the drive motor 8. A processing table 4 is provided in the middle of the upper end face of the base 1. A high-voltage pulse unit is provided inside the processing table 4. A support platform 11 is fixedly connected to the upper side of the base 1 inside the processing table 4. A connecting part 9 is detachably connected to the upper end face of the support platform 11. The fixed frame 12 and the two ends of the detection connector 14 are respectively connected to cables. The two cables extend from the detection connector 14 to the left and right sides. The left and right connecting parts 9 are detachably connected to the ends of the left and right cables respectively. There are two sets of drive motors 8 and drive cylinders 18, which are symmetrically arranged on the left and right sides along the detection connector 14. The drive cylinders 18 drive the drive motors 8 to move back and forth in the horizontal direction of the limiting groove 6 through the mounting plate 7, thereby realizing the axial tensile load on the cables at both ends of the connector. The drive motors 8 drive the cable ends to rotate around their own axis through the connecting parts 9, thereby realizing the torsional load around the axis. The tensile and torsional loads can be applied independently or simultaneously. The fixed frame 12 is equipped with a detection mechanism 100.

[0017] Furthermore, the testing mechanism 100 includes a connecting block 101 and several arc-shaped locking blocks 105. The testing connector 14 is detachably connected to the inside of the connecting block 101. Two sets of tensile testing rods 102 are fixedly connected to the front and rear sides of the connecting block 101. Annular sleeves 103 are detachably connected to the left and right sides of the connecting block 101. Several sliding grooves 104 are fixedly opened inside the annular sleeves 103. Limiting sliders 107 are fixedly connected to the surface of the arc-shaped locking blocks 105. The limiting sliders 107 are slidably connected to the inside of the sliding grooves 104. A torsion testing rod 106 is fixedly connected to the middle of the arc surface of the arc-shaped locking blocks 105. The cooperation between the limiting sliders 107 and the sliding grooves 104 gives the arc-shaped locking blocks 105 the freedom to slide radially along the connector. When a bulge occurs on the surface of the connector, the bulge acts on the inner wall of the arc-shaped locking blocks 105, driving the arc-shaped locking blocks 105 to slide outward along the sliding grooves 104 and overcome the elastic force of the return spring, thereby causing the torsion testing rod 106 to generate a radial lifting displacement.

[0018] Furthermore, a limiting block 13 is fixedly connected inside the fixed frame 12, and a connecting block 101 is slidably connected inside the limiting block 13. The limiting slider 107 is T-shaped, and a return spring is provided at the connection between the limiting slider 107 and the slide groove 104. The slide groove 104 is in contact with the cable surface. There are eight sets of slide grooves 104. When four sets of slide grooves 104 are in contact with the cable surface, they are arranged in a ring.

[0019] Furthermore, the upper left and right sides of the support platform 11 are provided with ring frames 19, and the inside of the ring frames 19 is provided with four sets of first air valves 15 and four sets of second air valves 16. The front and rear sides of the inside of the fixed frame 12 are provided with third air valves 17. The surfaces of the first air valves 15, second air valves 16 and third air valves 17 are provided with contacts, and the first air valves 15, second air valves 16 and third air valves 17 trigger pneumatic signals through the contacts. When the detection connector 14 is stretched and slipped, the tensile detection rod 102 moves with the detection connector 14 and triggers the first pneumatic signal; When the detection connector 14 causes the cable to twist and bulge, the torsion detection rod 106 is lifted by the bulge and triggers the second pneumatic signal; The tensile detection rod 102 and the torsion detection rod 106 work independently. When tensile slippage and torsion bulging occur simultaneously, the torsion detection rod 106 is lifted up while moving with the connecting block 101, triggering the third pneumatic signal.

[0020] Furthermore, a controller 3 is provided at the front end of the base 1, and a warning light 10 is provided on the surface of the base 1. The first pneumatic signal, the second pneumatic signal and the third pneumatic signal are all transmitted to the controller 3 through an insulated hose. The controller 3 is equipped with a pneumatic-electric conversion switch to control the warning light 10 to issue an alarm.

[0021] Furthermore, controller 3 performs the following control based on the received pneumatic signal: Upon receiving the first pneumatic signal, a tensile failure is determined, and warning light 10 outputs a first-level warning. Upon receiving the second pneumatic signal, a torsional failure is determined, and warning light 10 outputs a second-level warning. Upon receiving the third pneumatic signal, a composite failure is determined. The controller 3 controls the drive motor 8 and drive cylinder 18 to stop working, and the warning light 10 outputs the highest level alarm. When the displacement of the connecting block 101 exceeds the preset limit value, the controller 3 controls the drive motor 8 and the drive cylinder 18 to stop working and cut off the high voltage pulse unit.

[0022] Furthermore, since tensile failure is a structural damage, characterized by the loss of gripping force between the cable and connector 14, resulting in conductor connection interruption, it is an immediate and irreversible fatal defect; torsional failure is damage to the insulation interface, characterized by relative slippage between the internal insulation layer and the cable surface and the generation of local air gaps, which is a cumulative and progressive potential defect; therefore, in the priority criteria of controller 3, the engineering hazard level of tensile failure is higher than that of torsional failure; when controller 3 receives the first pneumatic signal and the second pneumatic signal at the same time, it prioritizes the execution of the first-level warning and shutdown action corresponding to tensile failure to ensure test safety and the accuracy of failure tracing.

[0023] Furthermore, the lower side of the base 1 is provided with several support legs 2, and the upper end face of the base 1 is fixedly connected to the left and right sides with limit grooves 6, and the mounting plate 7 is slidably connected to the inside of the limit grooves 6.

[0024] Furthermore, both the detection mechanism 100 and the connecting part 9 are made of insulating engineering materials. The output end of the high-voltage pulse unit is electrically connected to the metal core of the cable. The high-voltage pulse is conducted to the detection connector 14 through the cable core, applying a pulse fatigue load to the connector. Since both the connecting part 9 and the detection mechanism 100 are made of insulating engineering materials, and an insulating hose is used in the pneumatic signal transmission, the high-voltage pulse will not cause electrical interference or short circuit breakdown to the loading mechanism and the detection mechanism during the transmission and application process.

[0025] Working principle: First, the operator installs the test connector 14 to be tested inside the connecting block 101 of the testing mechanism 100. The cables connected to both ends of the test connector 14 extend to the left and right sides respectively. Then, the ends of the cables on both sides are detachably connected to the connecting parts 9 of the output ends of the drive motors 8 on the left and right sides and locked. At the same time, the annular sleeves 103 and arc-shaped locking blocks 105 on both sides of the connecting block 101 are fitted onto the interface surface between the test connector 14 and the cable through the cooperation of the sliding groove 104 and the limiting slider 107. After the sample is loaded, the entire sample is in a test state that can be subjected to tensile and torsional loading. After the test begins, the controller 3 activates the drive cylinders 18 and drive motors 8 located on the left and right sides of the base 1. Since the drive cylinders 18 and drive motors 8 are symmetrically arranged along the test joint 14 and the mounting plate 7 is slidably connected in the limiting groove 6, the drive motor 8 can drive the connecting part 9 and the cable end to rotate around its own axis when it is powered on, thereby realizing the axial torsional load on both sides of the joint. At the same time, the piston rod of the drive cylinder 18 extends or retracts, and through the mounting plate 7, drives the drive motor 8 and the connecting part 9 to move horizontally along the limiting groove 6, thereby realizing the axial tensile load on both sides of the joint. During the test, the tensile load and the torsional load can be applied separately or simultaneously, so that the test joint 14 is in a state of bearing composite mechanical stress. While the composite loading mechanism applies tensile and torsional loads to the test connector 14, or after the loading reaches a preset stable value, the high-voltage pulse unit inside the processing table 4 is activated. The output end of the high-voltage pulse unit is electrically connected to the metal core of the cable. The high-voltage pulse is conducted to the test connector 14 through the metal core of the cable, causing the internal conductor and the external insulation layer of the test connector 14 to be subjected to instantaneous high-voltage electric field stress. Under the continuous action of the high-voltage pulse and tensile and torsional loads, the test connector 14 may fail in different types: Tensile failure trigger: When the gripping force of the detection connector 14 is insufficient, causing the cable to slip out of the inside of the detection connector 14, the connecting block 101 moves axially relative to the fixed frame 12 along with the outer wall of the detection connector 14. At this time, the tensile detection rod 102 fixed on the front and rear sides of the connecting block 101 moves synchronously with the movement of the connecting block 101 and directly contacts the contact point of the third air valve 17 inside the fixed frame 12, triggering the first pneumatic signal. Torsional failure trigger: When the detection connector 14 is subjected to a torsional load around the axis, causing relative slippage between the internal insulation layer and the cable, a bulge is generated at the junction of the connector and the cable. The bulge pushes up the arc-shaped locking block 105 that is attached to the surface, causing the arc-shaped locking block 105 to slide along the slide groove 104, thereby driving the torsion detection rod 106 fixed in the middle of the arc surface of the arc-shaped locking block 105 to rise upward. The rising torsion detection rod 106 directly contacts the contact point of the first air valve 15 inside the ring frame 19, triggering the second pneumatic signal. Composite failure triggering: When tensile slippage and torsional bulging occur simultaneously, the connecting block 101 generates axial displacement, and the arc-shaped locking block 105 is lifted by the bulge. At this time, the torsion detection rod 106 moves axially with the connecting block 101 to a predetermined position, and is simultaneously lifted upward by the arc-shaped locking block 105 at the predetermined position, thereby contacting the contact of the second air valve 16 located at a higher position or adjacent position inside the ring frame 19, triggering the third pneumatic signal; At the moment the first air valve 15, the second air valve 16, and the third air valve 17 are triggered, their contacts transmit pneumatic signals through insulated hoses to the controller 3 at the front end of the base 1; the pneumatic-to-electric conversion switch inside the controller 3 converts the pneumatic signals into electrical signals, and performs the following hierarchical control according to the received electrical signals: Level 1 warning: When the controller 3 receives only the first pneumatic signal, it determines that the detection joint 14 has failed due to a single tensile slippage, and the warning light 10 outputs a level 1 warning signal (e.g., a yellow light flashing rapidly). Second-level warning: When the controller 3 receives only the second pneumatic signal, it determines that the detection connector 14 has failed due to a single torsional bulge, and the warning light 10 outputs a second-level warning signal (e.g., a slow yellow light). Highest level alarm: When the controller 3 receives the third pneumatic signal, it determines that the detection connector 14 has suffered a serious composite failure. The controller 3 immediately controls the drive cylinders 18 on the left and right sides and the drive motor 8 to stop working and depressurize. At the same time, the warning light 10 outputs the highest level alarm signal (such as flashing red light and continuous sound). Emergency stop control: When the displacement of the connecting block 101 exceeds the preset limit displacement threshold inside the controller 3, such as when the cable breaks at the far end and causes excessive long-distance slippage, the controller 3 automatically cuts off the high-voltage pulse unit and controls the drive cylinder 18 and drive motor 8 to stop urgently to avoid damage caused by excessive stretching.

[0026] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the scope and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-voltage pulse fatigue testing device for a joint, comprising a base (1) and a testing joint (14), characterized in that: The upper surface of the base (1) is fixedly connected to the left and right sides of the base. A drive cylinder (18) is fixedly mounted on the surface of the fixed frame (5). The output end of the drive cylinder (18) is detachably connected to a mounting plate (7). A drive motor (8) is fixedly mounted on the surface of the mounting plate (7). The output end of the drive motor (8) is fixedly connected to a connecting part (9). A processing table (4) is provided in the middle of the upper surface of the base (1). A high-voltage pulse unit is provided inside the processing table (4). The inside of the processing table (4) is... A support platform (11) is fixedly connected to the upper side of the base (1). A fixed frame (12) is detachably connected to the upper end of the support platform (11). Cables are connected to both ends of the detection connector (14). The two cables extend from the detection connector (14) to the left and right sides. The left and right connecting parts (9) are detachably connected to the ends of the left and right cables respectively. Two sets of drive motors (8) and drive cylinders (18) are provided, which are arranged symmetrically on the left and right sides along the detection connector (14). A detection mechanism (100) is provided inside the fixed frame (12).

2. The high-voltage pulse fatigue testing device for joints according to claim 1, characterized in that: The testing mechanism (100) includes a connecting block (101) and several arc-shaped locking blocks (105). The testing connector (14) is detachably connected to the inside of the connecting block (101). Two sets of tensile testing rods (102) are fixedly connected to the front and rear sides of the connecting block (101). Annular sleeves (103) are detachably connected to the left and right sides of the connecting block (101). Several sliding grooves (104) are fixedly opened inside the annular sleeves (103). Limiting sliders (107) are fixedly connected to the surface of the arc-shaped locking blocks (105). The limiting sliders (107) are slidably connected to the inside of the sliding grooves (104). Torsion testing rods (106) are fixedly connected to the middle of the arc surface of the arc-shaped locking blocks (105).

3. The high-voltage pulse fatigue testing device for joints according to claim 2, characterized in that: The fixed frame (12) is fixedly connected to the limiting block (13), the connecting block (101) is slidably connected to the inside of the limiting block (13), the limiting slider (107) is T-shaped, the limiting slider (107) is provided with a return spring at the connection between the sliding slider (107) and the slide groove (104), the slide groove (104) is attached to the surface of the cable, and there are eight sets of slide grooves (104). When the four sets of slide grooves (104) are attached to the surface of the cable, they are arranged in a ring.

4. The high-voltage pulse fatigue testing device for a joint according to claim 3, characterized in that: The upper left and right sides of the support platform (11) are provided with ring frames (19). The ring frames (19) are provided with four sets of first air valves (15) and four sets of second air valves (16). The front and rear sides of the fixed frame (12) are provided with third air valves (17). The surfaces of the first air valves (15), second air valves (16) and third air valves (17) are provided with contacts. The first air valves (15), second air valves (16) and third air valves (17) trigger pneumatic signals through the contacts. When the test connector (14) is stretched and slipped, the tensile test rod (102) moves with the test connector (14) and triggers the first pneumatic signal; When the detection connector (14) causes the cable to twist and bulge, the torsion detection rod (106) is lifted by the bulge and triggers the second pneumatic signal; The tensile detection rod (102) and the torsion detection rod (106) work independently. When tensile slippage and torsion bulging occur simultaneously, the torsion detection rod (106) is lifted while moving with the connecting block (101), triggering the third pneumatic signal.

5. The high-voltage pulse fatigue testing device for joints according to claim 4, characterized in that: The front end of the base (1) is provided with a controller (3), and the surface of the base (1) is provided with a warning light (10). The first pneumatic signal, the second pneumatic signal and the third pneumatic signal are all transmitted to the controller (3) through an insulating hose. The controller (3) is provided with a pneumatic-electric conversion switch inside, which is used to control the warning light (10) to issue an alarm.

6. The high-voltage pulse fatigue testing device for joints according to claim 5, characterized in that: The controller (3) performs the following control based on the received pneumatic signal: Upon receiving the first pneumatic signal, it is determined that the tension has failed, and the warning light (10) outputs the first-level warning. Upon receiving the second pneumatic signal, it is determined that the torsional failure has occurred, and the warning light (10) outputs a second-level warning. Upon receiving the third pneumatic signal, a composite failure is determined. The controller (3) controls the drive motor (8) and drive cylinder (18) to stop working, and the warning light (10) outputs the highest level alarm. When the displacement of the connecting block (101) exceeds the preset limit value, the controller (3) controls the drive motor (8) and the drive cylinder (18) to stop working and cut off the high voltage pulse unit.

7. The high-voltage pulse fatigue testing device for joints according to claim 6, characterized in that: The base (1) is provided with several legs (2) on its lower side. The upper end face of the base (1) is fixedly connected to the left and right sides of the limiting groove (6). The mounting plate (7) is slidably connected to the inside of the limiting groove (6).

8. The high-voltage pulse fatigue testing device for joints according to claim 7, characterized in that: The detection mechanism (100) and the connection part (9) are both made of insulating engineering materials. The output end of the high voltage pulse unit is electrically connected to the metal core wire of the cable. The high voltage pulse is conducted to the detection joint (14) through the cable core wire and applies a pulse fatigue load to the joint.

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