A test device for cable intermediate joint

Abstract

The present invention discloses a test device for a cable intermediate joint, and relates to the technical field of cable intermediate joint testing. The test assembly is located in the middle of a test frame and is used to fix the intermediate joint. The test assembly is slidably connected inside with a test mechanism for testing partial discharge. The cable plug assembly is arranged on both sides of the test assembly. The cable plug assembly drives the cable to be inserted into the intermediate joint, and a push assembly is arranged on one side of the cable plug assembly. The cable plug assembly moves while driving the push assembly to be inserted into the test assembly and pushing the test mechanism to slide. The push assembly passes through the test mechanism to make the test mechanism move back, and performs a partial discharge test on the intermediate joint and displays the result visually on the test assembly. The present invention displays the distance moved by the arc plate and the detected magnetic induction intensity as two-dimensional data directly on the display, so that the staff can intuitively see the result of the discharge test and quickly find the partial discharge position.

Description

Technical Field

[0001] The invention relates to the technical field of cable intermediate joint testing, and in particular to a cable intermediate joint testing device. Background Art

[0002] At present, in the process of cable laying, cable intermediate joints are usually used as conductors to connect two cables. For this reason, the cable intermediate joints themselves are provided with insulating shielding layers and protective layers to effectively connect the cable lines. According to national standards, cable intermediate joints must be tested for power frequency withstand voltage and partial discharge before leaving the factory to ensure that the electrical performance meets the standard requirements.

[0003] At present, when conducting partial discharge tests, it is necessary to insert the cable into the intermediate joint and test the partial discharge amount of the intermediate joint after power is turned on. However, the existing test components are fixed on the test rack. Although simple partial discharge tests can be performed, the partial discharge position of the cable intermediate joint cannot be quickly found, which is of no help to the subsequent production of cable intermediate joints. Summary of the invention

[0004] The purpose of the present invention is to provide a testing device for a cable intermediate joint to solve the problem that, although a simple partial discharge test can be performed, the partial discharge position of the cable intermediate joint cannot be quickly found, which is of no help to the subsequent production of the cable intermediate joint.

[0005] A test device for an intermediate cable joint comprises a test frame, a test assembly and a cable plug assembly, wherein the test assembly is located in the middle of the test frame and is used to fix the intermediate joint, a test mechanism for testing partial discharge is slidably connected inside the test assembly, the cable plug assembly is arranged on both sides of the test assembly, the cable plug assembly drives the cable to be inserted into the intermediate joint and a pushing assembly is arranged on one side of the cable plug assembly, the cable plug assembly moves while driving the pushing assembly to be inserted into the test assembly and pushes the test mechanism to slide, the pushing assembly passes through the test mechanism to make the test mechanism move back, a partial discharge test is performed on the intermediate joint and the result is visually displayed on the test assembly.

[0006] Preferably, the test assembly includes an electromagnetic shielding test bracket and an intermediate joint fixing mechanism, and electromagnetic shielding plates are detachably connected to both sides of the test bracket. The intermediate joint fixing mechanism fixes the intermediate joint and the test mechanism is surrounded by the outside of the intermediate joint fixing mechanism. The test mechanism performs a partial discharge test on the intermediate joint in the process of the pushing assembly sliding and moving back along the inner wall of the test bracket.

[0007] Preferably, the testing mechanism includes symmetrically arranged arc plates, springs and magnetic sensors, the arc plates are symmetrically arranged on both sides of the intermediate joint fixing mechanism and a plurality of the magnetic sensors are provided on the side of the arc plate close to the intermediate joint fixing mechanism, a display is provided on the surface of the test bracket, the output end of the magnetic sensor is connected to the display by means of a data wire, the arc plate is slidably connected to the inner wall of the test bracket and a through hole corresponding to the pushing assembly is provided in the middle of the arc plate, springs are provided between the upper and lower ends of the arc plate and one of the electromagnetic shielding plates and a ranging sensor is provided on the electromagnetic shielding plate.

[0008] Preferably, the pushing assembly includes a symmetrically arranged L-shaped bracket and a rubber plug, and the L-shaped bracket is symmetrically arranged on one side of the cable plug assembly close to the test assembly. The cable plug assembly drives the horizontal portion of the L-shaped bracket to be inserted into the test bracket and drives the rubber plug to be inserted into the through hole so that the spring is stretched, and when the rubber plug passes through the through hole, the spring drives the arc plate to move to the initial position under the drive of the spring, and during the movement, the magnetic sensor and the ranging sensor are tested and the test results are visually displayed on the display.

[0009] Preferably, the intermediate joint fixing mechanism includes a lifting cylinder and a pressure plate. The lifting cylinder is provided on the top of the test bracket and the lifting cylinder is fixedly connected to the pressure plate. A fixing plate corresponding to the pressure plate is provided on the test frame, and the intermediate joint is clamped between the pressure plate and the fixing plate.

[0010] Preferably, the cable plug-in assembly includes a fixing mechanism and a moving mechanism that drives the fixing mechanism to move toward the test assembly, the fixing mechanism includes a fixing seat, a fixing bracket and a fixed cylinder, the top of the fixing seat is fixedly connected to the fixing bracket and the top of the fixing bracket is fixedly connected to the fixed cylinder, the movable end of the fixed cylinder passes through the fixing bracket and is fixedly connected to an arc-shaped top plate, the fixing seat is provided with an arc-shaped bottom plate corresponding to the arc-shaped top plate, and the pushing assembly is provided on a side of the fixing bracket close to the test assembly.

[0011] Preferably, the moving mechanism includes a guide rod, a rotating motor and two transmission screws, extension plates are symmetrically fixedly connected on both sides of the test frame, the guide rod is fixedly connected between the middle parts of the two extension plates, and the two transmission screws are symmetrically rotationally connected on both sides of the guide rod, one of the transmission screws is fixedly connected to the rotating motor at the end, and the two transmission screws are transmission-connected by meshing transmission gear parts, and the two transmission screws are connected to the fixed seat by screw nuts.

[0012] The present invention has the following advantages:

[0013] The present invention provides a test assembly and a cable plug assembly. Between tests, the intermediate joint is fixed in the test assembly, and the intermediate joint is fixed by an intermediate joint fixing mechanism. The fixing mechanism on the cable plug assembly is used to fix the cable. After the cable is fixed, the moving mechanism is used to drive the cable to be inserted into the two sides of the intermediate joint respectively, so as to realize the connection between the intermediate joint and the cable. When plugging the cable, the end of the assembly is pushed to be inserted into the through hole of the test mechanism, and the rubber plug is used to drive the arc plate to move, and the spring is stretched at the same time. When the elastic force of the spring is greater than the elastic force of the rubber plug, the arc plate will pass through the rubber plug. At this time, the arc plate will gradually move to the initial position driven by the spring. At this time, the cable is energized, and the local release of the intermediate joint is tested. Electrical phenomenon, once the intermediate joint discharges, a magnetic field will inevitably be generated. The magnetic induction intensity is different at different positions. The arc plate will pass through different positions of the intermediate joint during movement. The magnetic sensor is used to measure the magnetic induction intensity at different positions, and the distance is displayed by the distance measuring sensor. The final distance and magnetic induction intensity will become a two-dimensional data directly displayed on the display. The staff can intuitively see the results of the discharge test. If multiple intermediate joints tested have a large local discharge phenomenon at the same position, it means that the production process of the intermediate joint at this position has a large defect and needs to be improved. The present invention can quickly find the local discharge position of the cable intermediate joint and conduct a comprehensive inspection of the intermediate joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 for Figure 1 Front view of the structure shown.

[0016] Figure 3 for Figure 1 Schematic diagram of the structure of the test component shown.

[0017] Figure 4 for Figure 1 Schematic diagram of the structure of the test mechanism shown.

[0018] Figure 5 for Figure 1 Schematic diagram of the internal structure of the test component of the structure shown.

[0019] The symbols in the accompanying drawings are:

[0020] 1. Test rack;

[0021] 2. Test assembly; 21. Test bracket; 22. Electromagnetic shielding plate; 23. Display; 24. Middle joint fixing mechanism; 241. Lifting cylinder; 242. Pressing plate; 243. Fixing plate; 25. Test mechanism; 251. Arc plate; 252. Magnetic sensor; 253. Distance sensor; 254. Through hole; 255. Spring;

[0022] 3. Cable plug assembly; 31. Fixing mechanism; 311. Fixing bracket; 312. Fixing seat; 313. Fixing cylinder; 314. Arc top plate; 315. Arc pressure plate; 32. Moving mechanism; 321. Guide rod; 322. Rotating motor; 323. Transmission screw; 324. Transmission gear member;

[0023] 4. Pushing assembly; 41. L-shaped bracket; 42. Rubber plug. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0025] like Figure 1-5 As shown, the present invention provides a test device for an intermediate cable joint, comprising a test frame 1, a test component 2 and a cable plug-in component 3, wherein the test component 2 is located in the middle of the test frame 1 and is used to fix the intermediate joint, the test component 2 is internally slidably connected with a test mechanism 25 for testing partial discharge, the cable plug-in component 3 is arranged on both sides of the test component 2, the cable plug-in component 3 drives the cable to be inserted into the intermediate joint and a pushing component 4 is arranged on one side of the cable plug-in component 3, the cable plug-in component 3 moves while driving the pushing component 4 to be inserted into the test component 2 and push the test mechanism 25 to slide, the pushing component 4 passes through the test mechanism 25 so that when the test mechanism 25 moves back, a partial discharge test is performed on the intermediate joint and the result is visually displayed on the test component 2.

[0026] The test component 2 includes an electromagnetic shielding test bracket 21 and an intermediate joint fixing mechanism 24. The two sides of the test bracket 21 are respectively detachably connected with electromagnetic shielding plates 22. The intermediate joint fixing mechanism 24 fixes the intermediate joint and the test mechanism 25 is surrounded by the outside of the intermediate joint fixing mechanism 24. The test mechanism 25 performs a partial discharge test on the intermediate joint during the process of sliding and moving back along the inner wall of the test bracket 21 by the pushing component 4. The testing mechanism 25 includes a symmetrically arranged arc plate 251, a spring 255 and a magnetic sensor 252, wherein the arc plate 251 is symmetrically arranged on both sides of the intermediate joint fixing mechanism 24 and a plurality of the magnetic sensors 252 are arranged on the side of the arc plate 251 close to the intermediate joint fixing mechanism 24, a display 23 is arranged on the surface of the testing bracket 21, and the output end of the magnetic sensor 252 is connected to the display 23 by means of a data wire, the arc plate 251 is slidably connected to the inner wall of the testing bracket 21 and a through hole 254 corresponding to the pushing assembly 4 is arranged in the middle of the arc plate 251, a spring 255 is arranged between the upper and lower ends of the arc plate 251 and one of the electromagnetic shielding plates 22, and a ranging sensor 253 is arranged on the electromagnetic shielding plate 22. The pushing component 4 includes a symmetrically arranged L-shaped bracket 41 and a rubber plug 42. The L-shaped bracket 41 is symmetrically arranged on one side of the cable plug component 3 close to the test component 2. The cable plug component 3 drives the horizontal part of the L-shaped bracket 41 to be inserted into the test bracket 21 and drives the rubber plug 42 to be inserted into the through hole 254 so that the spring 255 is stretched. When the rubber plug 42 passes through the through hole 254, the spring 255 drives the arc plate 251 to move to the initial position under the drive of the spring 255. During the movement, the magnetic sensor 252 and the ranging sensor 253 are tested and the test results are visually displayed on the display 23.

[0027] The cable plug assembly 3 on one side drives the pushing assembly 4 to move toward the test assembly 2, so that the horizontal part of the L-shaped bracket 41 is inserted into the test bracket 21. Since the arc plate 251 is provided with a through hole 254 corresponding to the rubber plug 42, the size of the rubber plug 42 is slightly larger than the diameter of the through hole 254, so the rubber plug 42 will not pass through the through hole 254, so the rubber plug 42 keeps pushing the arc plate 251 to move toward the cable plug assembly 3 on the other side, so that the spring 255 is stretched until it reaches the limit value of the spring 255. At this time, the cable plug assembly 3 continues to drive the rubber plug 42 to move. The arc plate 251 is pulled by the spring 255, and two forces in opposite directions cause the rubber plug 42 to pass through the through hole 254. Under the pull of the spring 255, the arc plate 251 moves along the horizontal part of the L-shaped bracket 41, driving the magnetic sensor 252 to move along the length direction of the middle joint, which can fully measure the local discharge phenomenon of the middle joint. The moving distance of the arc plate 251 is measured by the ranging sensor 253, and then a two-dimensional data or a two-dimensional graph is formed and displayed on the display 23. The electromagnetic shielding plates 22 on both sides of the test bracket 21 reduce the interference of external current, and the test effect is better.

[0028] The intermediate joint fixing mechanism 24 includes a lifting cylinder 241 and a pressing plate 242. The lifting cylinder 241 is provided on the top of the test bracket 21 and the lifting cylinder 241 is fixedly connected to the pressing plate 242. A fixing plate 243 corresponding to the pressing plate 242 is provided on the test frame 1, and the intermediate joint is clamped between the pressing plate 242 and the fixing plate 243.

[0029] The lifting cylinder 241 drives the pressing plate 242 to move downward, so that the middle joint is clamped between the fixing plate 243 and the pressing plate 242, thereby preventing the middle joint from moving when the cable is plugged in.

[0030] The cable plug-in assembly 3 includes a fixing mechanism 31 and a moving mechanism 32 for driving the fixing mechanism 31 to move toward the test assembly 2. The fixing mechanism 31 includes a fixing seat 312, a fixing bracket 311 and a fixing cylinder 313. The top of the fixing seat 312 is fixedly connected to the fixing bracket 311 and the top of the fixing bracket 311 is fixedly connected to the fixing cylinder 313. The movable end of the fixing cylinder 313 passes through the fixing bracket 311 and is fixedly connected to an arc-shaped top plate 314. The fixing seat 312 is provided with an arc-shaped bottom plate 315 corresponding to the arc-shaped top plate 314. The pushing assembly 4 is arranged on a side of the fixing bracket 311 close to the test assembly 2.

[0031] The cable plug-in assembly 3 is used to fix the cable. The fixed cylinder 313 is used to drive the arc-shaped top plate 314 to move downward, so that the cable is fixed between the arc-shaped top plate 314 and the arc-shaped bottom plate 315. The moving mechanism 32 drives the two fixed seats 312 to move toward each other, so that the end of the cable is inserted into the middle joint.

[0032] The moving mechanism 32 includes a guide rod 321, a rotating motor 322 and two transmission screws 323. Extension plates are symmetrically fixedly connected to the two sides of the test frame 1. The guide rod 321 is fixedly connected between the middle parts of the two extension plates, and the two sides of the guide rod 321 are symmetrically rotationally connected to the two transmission screws 323. The end of one of the transmission screws 323 is fixedly connected to the rotating motor 322, and the two transmission screws 323 are transmission-connected by meshing transmission gears 324. The two transmission screws 323 are connected to the fixed seat 312 by screw nuts.

[0033] The guide rod 321 is fixed in the middle between the two extension plates, and two transmission screws 323 with opposite directions are respectively arranged on both sides of the guide rod 321. Specifically, a rotating motor 322 can be arranged at the end of one of the transmission screws 323, and the transmission gear member 324 can be configured to utilize two mutually meshing active wheels and driven wheels, so that the active wheel and the driven wheel can rotate in opposite directions, thereby realizing the opposite rotation of the two transmission screws. The bottom of the fixed seat 312 is fixedly connected to the screw nut of the transmission screw, and the fixed seat 312 can be slidably connected to the guide rod 321, which makes the movement of the fixed seat 312 more stable on the one hand, and provides a guiding function on the other hand. The two transmission screws 323 rotate in opposite directions, so that the two fixed seats 312 can move toward each other or in the opposite direction.

[0034] When the present invention is used, in the initial state, the cable plug assembly 3 and the intermediate joint fixing structure respectively fix the cable and the intermediate joint, and then the rotating motor drives the two transmission screws 323 to rotate, driving the cable plug assemblies 3 on both sides of the test assembly 2 to move toward each other, so as to insert the cable into the two sides of the intermediate joint, wherein the cable plug assembly 3 on one side drives the pushing assembly 4 to move toward the test assembly 2, and when the cable has not yet been inserted into the intermediate joint, the horizontal portion of the L-shaped bracket 41 is inserted into the test bracket 21, and since a through hole 254 corresponding to the rubber plug 42 is provided on the arc plate 251, and the size of the rubber plug 42 is slightly larger than the diameter of the through hole 254, the rubber plug 42 will not directly pass through the through hole 254, and the rubber plug 42 keeps pushing the arc plate 251 to move toward the cable plug assembly 3 on the other side, The spring 255 is stretched until it reaches the limit value of the spring 255. At this time, the cable plug assembly 3 continues to drive the rubber plug 42 to move, and the arc plate 251 is pulled by the spring 255. Two forces in opposite directions cause the rubber plug 42 to pass through the through hole 254. Under the pull of the spring 255, the arc plate 251 moves along the horizontal part of the L-shaped bracket 41, driving the magnetic sensor 252 to move along the length direction of the middle joint. Since a magnetic field will inevitably be generated where there is current, it can be inferred that the stronger the magnetic induction intensity, the more serious the partial discharge phenomenon. The movement of the magnetic sensor 252 along the length direction of the middle joint can fully measure the partial discharge phenomenon of the middle joint. The distance moved by the arc plate 251 is measured by the distance measuring sensor 253, and then a two-dimensional data or a two-dimensional graph is formed and displayed on the display 23. The present invention can quickly detect the specific discharge position of the middle joint. If multiple tested middle joints have a large partial discharge phenomenon at the same position, it means that the production process of the middle joint at this position has a large defect and needs to be improved.

[0035] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the inventive concept and technical solution of the present invention, or the inventive concept and technical solution are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A test device for a cable intermediate joint, characterized in that: The invention comprises a test frame (1), a test assembly (2) and a cable plug assembly (3), wherein the test assembly (2) is located in the middle of the test frame (1) and is used to fix the intermediate joint, a test mechanism (25) for testing partial discharge is slidably connected inside the test assembly (2), the cable plug assembly (3) is arranged on both sides of the test assembly (2), the cable plug assembly (3) drives the cable to be inserted into the intermediate joint and a pushing assembly (4) is arranged on one side of the cable plug assembly (3), the cable plug assembly (3) moves while driving the pushing assembly (4) to be inserted into the test assembly (2) and to push the test mechanism (25) to slide, the pushing assembly (4) passes through the test mechanism (25) so that when the test mechanism (25) moves back, a partial discharge test is performed on the intermediate joint and the result is visually displayed on the test assembly (2); The test assembly (2) comprises an electromagnetically shielded test bracket (21) and an intermediate joint fixing mechanism (24); electromagnetic shielding plates (22) are detachably connected to both sides of the test bracket (21); the intermediate joint fixing mechanism (24) fixes the intermediate joint and the test mechanism (25) surrounds the outer side of the intermediate joint fixing mechanism (24); the test mechanism (25) performs a partial discharge test on the intermediate joint in a process in which the pushing assembly (4) slides along the inner wall of the test bracket (21) and moves back; The test mechanism (25) comprises a symmetrically arranged arc plate (251), a spring (255) and a magnetic sensor (252); the arc plate (251) is symmetrically arranged on both sides of the intermediate joint fixing mechanism (24) and a plurality of the magnetic sensors (252) are arranged on the side of the arc plate (251) close to the intermediate joint fixing mechanism (24); a display (23) is arranged on the surface of the test bracket (21); an output end of the magnetic sensor (252) is connected to the display (23) by means of a data wire; the arc plate (251) is slidably connected to the inner wall of the test bracket (21) and a through hole (254) corresponding to the pushing component (4) is arranged in the middle of the arc plate (251); a spring (255) is arranged between the upper and lower ends of the arc plate (251) and one of the electromagnetic shielding plates (22); and a distance measuring sensor (253) is arranged on the electromagnetic shielding plate (22); The pushing component (4) comprises a symmetrically arranged L-shaped bracket (41) and a rubber plug (42); the L-shaped bracket (41) is symmetrically arranged on one side of the cable plug component (3) close to the test component (2); the cable plug component (3) drives the horizontal portion of the L-shaped bracket (41) to be inserted into the test bracket (21) and drives the rubber plug (42) to be inserted into the through hole (254) so ​​that the spring (255) is stretched; when the rubber plug (42) passes through the through hole (254), the spring (255) drives the arc plate (251) to move to an initial position under the drive of the spring (255); and during the movement, the magnetic sensor (252) and the distance sensor (253) are tested and the test results are visually displayed on the display (23).

2. A cable intermediate joint testing device according to claim 1, characterized in that: The intermediate joint fixing mechanism (24) comprises a lifting cylinder (241) and a pressing plate (242); the lifting cylinder (241) is provided on the top of the test bracket (21) and the pressing plate (242) is fixedly connected to the lifting cylinder (241); a fixing plate (243) corresponding to the pressing plate (242) is provided on the test frame (1); and the intermediate joint is clamped between the pressing plate (242) and the fixing plate (243).

3. A cable intermediate joint testing device according to claim 1, characterized in that: The cable plug-in assembly (3) comprises a fixing mechanism (31) and a moving mechanism (32) for driving the fixing mechanism (31) to move in the direction of the test assembly (2); the fixing mechanism (31) comprises a fixing seat (312), a fixing bracket (311) and a fixing cylinder (313); the top of the fixing seat (312) is fixedly connected to the fixing bracket (311) and the top of the fixing bracket (311) is fixedly connected to the fixing cylinder (313); the movable end of the fixing cylinder (313) passes through the fixing bracket (311) and is fixedly connected to an arc-shaped top plate (314); the fixing seat (312) is provided with an arc-shaped bottom plate (315) corresponding to the arc-shaped top plate (314); and the pushing assembly (4) is arranged on a side of the fixing bracket (311) close to the test assembly (2).

4. A cable intermediate joint testing device according to claim 3, characterized in that: The moving mechanism (32) comprises a guide rod (321), a rotating motor (322) and two transmission lead screws (323); the two sides of the test frame (1) are symmetrically fixedly connected with extension plates; the guide rod (321) is fixedly connected between the middle parts of the two extension plates; and the two sides of the guide rod (321) are symmetrically rotationally connected with the two transmission lead screws (323); the end of one transmission lead screw (323) is fixedly connected with the rotating motor (322); the two transmission lead screws (323) are transmission-connected via meshing transmission gears (324); and the two transmission lead screws (323) are connected to the fixing seat (312) via lead screw nuts.

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