A 20kV cable accessory test detection platform and detection method

Abstract

The application provides a 20kV cable accessory test detection platform and a detection method, and belongs to the technical field of cable accessory detection. The platform comprises a workbench and a detection mechanism. The detection mechanism comprises a hydraulic oil cylinder fixed on the top of the workbench through a support. The telescopic end of the hydraulic oil cylinder is fixed with a tension sensor. The top of the workbench and the bottom of the tension sensor are both rotationally connected with flat-nose pliers. The application is provided with a guide ring and a magnifying glass. The adjustable guide ring and the embedded magnifying glass on the side plate realize the magnified observation of the crimping position of the wire nose after the pull test. The detection personnel can accurately determine whether the crimping position produces a small crack. The guide ring can move vertically along the side plate to observe the crimping position at different heights. The wire nose can rotate in the horizontal direction to effectively observe the crimping position at different positions in the horizontal direction, thereby greatly improving the detection accuracy of the wire nose pull test.

Description

Technical Field

[0001] This invention relates to the field of cable accessory testing technology, and in particular to a 20kV cable accessory testing platform and testing method. Background Technology

[0002] 20kV cable accessories include cable terminations, intermediate joints, insulating bushings, grounding boxes, sheath protectors, stress cones, insulating fillers, sealing kits, and lugs. When performing a pull-out test on a lug, a section of conductor must first be cut, and then the lug is fitted onto the end of the conductor. The connection between the lug and the conductor is achieved through crimping. The lug is then clamped in the upper clamp of the pull-out testing machine, and the bottom of the conductor is clamped in the lower clamp, ensuring the conductor is vertical. The pull-out testing machine is then activated to apply tension to the connection between the conductor and the lug. After reaching the specified tension, it is observed whether the connection between the lug and the conductor has detached or shifted, and whether the crimping on the lug has cracked. This determines whether the connection between the lug and the conductor is stable and reliable.

[0003] After the pull-out test of the cable lug is completed, the connection between the cable lug and the conductor is usually judged by visual observation. However, it is difficult to accurately judge whether there are micro-cracks at the crimping point of the cable lug by visual observation alone, which affects the accuracy of the pull-out test of the cable lug. Therefore, this application provides a 20kV cable accessory testing platform and testing method to meet the requirements. Summary of the Invention

[0004] This invention provides a testing platform and method for 20kV cable accessories to address the issue of insufficient accuracy in testing the pull-out resistance of cable lugs.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A 20kV cable accessory testing and inspection platform includes a workbench and also includes: The testing mechanism includes a hydraulic cylinder fixed to the top of the workbench by a bracket. A tension sensor is fixed to the telescopic end of the hydraulic cylinder. Flat-jaw pliers are rotatably connected to the top of the workbench and the bottom of the tension sensor. The two flat-jaw pliers are used to clamp the wire lug and the bottom of the wire, respectively. A side plate is provided on the top of the workbench. A guide ring is movably sleeved on the side plate. A magnifying glass is embedded on the side of the guide ring near the flat-jaw pliers. A locking bolt is threaded to the side of the guide ring and abuts against the side of the side plate. A transparent plate is provided in the through groove opened on the side plate. The two flat-jaw pliers are used to clamp the wire lug and the wire before testing; the hydraulic cylinder is used to move the tension sensor upward to perform a pull test on the connection between the wire lug and the wire; the magnifying glass is used to observe whether the crimping on the wire lug is cracked after the test; the wire lug and / or the wire are configured to rotate horizontally so that different positions of the crimping can be observed through the magnifying glass.

[0006] Preferably, the top of the workbench and the bottom of the tension sensor are both fixed with limit shafts, and round seats are rotatably connected to both limit shafts. Two flat-nose pliers are respectively fixed on the opposite surfaces of the two round seats. During observation with a magnifying glass, the wire lugs are rotated in the horizontal direction by the round seats.

[0007] Preferably, a block is fixed to the side of the transparent plate, and a positioning bolt is threaded onto the block. The positioning bolt is inserted into a through hole opened on the side plate. The bottom of the transparent plate is rotatably connected to the side plate via a hinge. Before using a magnifying glass, the positioning bolt is unscrewed from the through hole, and the transparent plate is rotated downward to open the through groove. The side of the guide ring is integrally formed with two protrusions, and the locking bolt is located between the two protrusions.

[0008] Preferably, the top of the workbench and the top of the inner wall of the support are both fixed with arc-shaped guide rails, and the top and bottom of the side plate are both fixed with arc-shaped blocks. The arc-shaped blocks are rotatably connected in the arc-shaped guide rails. The side of the side plate has a square groove, and the threaded groove at the bottom of the inner wall of the square groove is threaded with a limit bolt. The top of the workbench has two limit holes, and the limit bolt is inserted into one of the limit holes. The side of the side plate is provided with a positioning component, which is used for positioning before wire detection.

[0009] Preferably, the positioning component includes a positioning block, an internally threaded sleeve fixed on the side of the side plate away from the wire, a screw threadedly connected to the internally threaded sleeve, a screw rotatably connected to the side of the positioning block near the side plate, the end of the screw away from the positioning block movably passing through the side plate and threadedly connected to the internally threaded sleeve, a handwheel fixed to the end of the screw away from the positioning block, a guide sleeve fixed on the side of the side plate away from the wire, a guide rod slidably connected inside the guide sleeve, the guide rod movably passing through the side plate and fixed to the side of the positioning block, a V-shaped groove opened on the side of the positioning block near the wire, before testing, the wire is positioned by fitting against the inner wall of the V-shaped groove, after the wire and the lug are respectively clamped by two flat-nose pliers, the side plate is rotated from the rear side of the wire to the front side of the wire.

[0010] Preferably, the positioning block includes an upper positioning part, a middle positioning part, and a lower positioning part. A V-shaped groove is formed on the side of the upper positioning part, the middle positioning part, and the lower positioning part near the wire. A connecting block is fixed on the side of the upper positioning part and the lower positioning part near the side plate. The top and bottom of the middle positioning part are rotatably connected to a rotating shaft. The rotating shaft is fixed on the side of the connecting block. A torsion spring is sleeved on the end of the rotating shaft. A limit block is fixed on the side of the middle positioning part. One end of the torsion spring is stuck in the notch at the end of the rotating shaft, and the other end abuts against the side of the limit block near the rotating shaft. A positioning seat is fixed on the top and bottom of the middle positioning part. Two sets of ribs are fixed on the opposite surfaces of the two connecting blocks. The two sets of ribs are fixed on the side of the upper positioning part and the middle positioning part near the side plate. A pin hole is formed on the side of the positioning seat and the rib. Before testing, a pin is inserted into the pin hole. After testing, the pin is pulled out from the pin hole. The screw is rotated to make the upper positioning part, the middle positioning part, and the lower positioning part squeeze the wire and bend the wire. When the wire bends, it drives the upper positioning part and the lower positioning part to rotate.

[0011] Preferably, the heights of the upper positioning part and the lower positioning part are both greater than the height of the middle positioning part.

[0012] Preferably, the inner wall of the V-shaped groove has curved surfaces at the connection points between the upper and middle positioning parts and between the lower and middle positioning parts.

[0013] Preferably, both the upper positioning part and the lower positioning part are fixed with a second positioning seat on the side away from the side plate. The second positioning seat has a round hole on its side. When rotating the wire lug, the pin is inserted into the round hole on the second positioning seat.

[0014] A testing method for 20kV cable accessories, applied to the aforementioned 20kV cable accessory testing platform, includes the following operations: S1: Clamp the lug in the upper flat-jaw pliers and the bottom of the wire in the lower flat-jaw pliers. Activate the hydraulic cylinder to move the tension sensor upward and apply tension to the connection between the lug and the wire to determine whether the connection has come loose or shifted. S2: If no detachment or displacement occurs at the connection, observe whether there are cracks at the crimping point on the wire lug through the magnifying glass on the guide ring. During the observation, rotate the round seat to rotate the wire lug in the horizontal direction to observe different positions of the crimping point. S3: If no cracks appear at the crimping point, control the hydraulic cylinder to move the upper flat-jaw pliers down, so that the wire changes from a taut state to a slack state. Then drive the positioning block to move closer to the wire, so that the wire bends. Then observe with a magnifying glass whether the copper wire at the bottom of the wire lug is broken.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a guide ring and a magnifying glass, the adjustable guide ring and the embedded magnifying glass on the side plate enable magnified observation of the crimped area of ​​the wire lug after the pull-out test. This allows the inspector to accurately determine whether there are any tiny cracks at the crimped area. The guide ring can move vertically along the side plate to observe the crimped area at different heights. At the same time, the wire lug can rotate in the horizontal direction, thereby enabling effective observation of different positions of the crimped area in the horizontal direction, which greatly improves the detection accuracy of the wire lug pull-out test.

[0016] By incorporating a side plate and a transparent plate, the side plate shields the front of the wire during testing. If the wire suddenly detaches from the lug connection during testing, metal fragments may fly outwards. The side plate blocks these flying metal fragments, protecting the testing personnel. After testing, the transparent plate allows direct observation of the wire-lug connection to see if detachment has occurred. If detachment is found, subsequent magnification is unnecessary, making it more convenient. Furthermore, when using a magnifying glass to observe the crimped area, the positioning bolt can be unscrewed from the through-hole, and the transparent plate can be rotated downwards to prevent the transparent plate from interfering with the testing personnel's observation of the lug with the magnifying glass, ensuring the accuracy of the observation.

[0017] By setting up a protrusion, when moving the guide ring, the finger pinches the protrusion on the side of the guide ring. The protrusion provides a stable force point for moving the guide ring up and down, making the up and down movement of the magnifying glass more reliable and stable.

[0018] By setting up an arc-shaped guide rail and an arc-shaped block, the side plate rotates, causing the arc-shaped block to rotate along the inner wall of the arc-shaped guide rail. The arc-shaped guide rail allows the side plate to rotate from the back of the wire to the front of the wire, or from the front of the wire to the back of the wire. When the side plate is located at the back of the wire, it fits the wire with the positioning component, ensuring that the wire is in a vertical position. Then, the wire lug and the wire can be fixed with flat-nose pliers. When the side plate is located at the front of the wire, it can block metal debris that splashes out due to the wire being pulled off the wire lug.

[0019] By setting up positioning blocks and V-grooves, when the side plate is located behind the wire, the wire is placed in the V-groove of the positioning block to achieve stable positioning of the wire, keeping the wire in a vertical state and preventing the wire from being skewed and affecting the test results. After the test is completed and the wire has not been pulled out of the lug, the hydraulic cylinder is activated to move the flat-jaw pliers located above downwards, so that the wire changes from a taut state to a relaxed state. Then, the screw is rotated to move the positioning block closer to the wire. The positioning block squeezes the wire to make it bend. If the wire breaks at the connection between the wire and the lug after bending, the copper wire at the break will open from the connection. The bending method, combined with the magnifying glass, makes it easy for the tester to observe whether the copper wire has broken.

[0020] By setting up an upper positioning part, a middle positioning part, a lower positioning part, and a pin, the pin is inserted into the pin hole of the positioning seat and the rib plate to prevent the rotation of the upper or lower positioning part from affecting the positioning of the wire. When the positioning block squeezes the wire, the pin is first pulled out of the pin hole, and then the screw is rotated to move the positioning block closer to the wire, and the middle positioning part squeezes the wire. After the wire is compressed, it bends. At the same time, the bending of the wire drives the upper and lower positioning parts to rotate closer to the side plate. Through the rotation of the upper and lower positioning parts to avoid the wire, the wire is squeezed by the middle positioning part and bends, reducing the obstruction of the upper and lower positioning parts on the bending of the wire, making the bending degree of the wire greater, and making the bending angle at the connection between the wire and the lug larger. This provides sufficient space for the broken copper wire to open, thereby making it easier for the testers to observe whether the copper wire is broken, and at the same time further improving the detection accuracy of the lug pull test.

[0021] By setting curved surfaces, the rotation of the conductor is made smoother and easier. Curved surfaces are opened at the bottom of the upper positioning part, the top and bottom of the middle positioning part, and the top of the lower positioning part. When the upper positioning part, lower positioning part, and middle positioning part come into contact with the conductor, sharp edges are prevented. This avoids sharp edges pressing against the conductor insulation and increasing friction, thereby reducing the rotation resistance of the conductor. This makes it easier and smoother to observe the cracking of different crimping points and the broken state of the copper wire at the bottom of the lug when the conductor rotates horizontally.

[0022] By setting up positioning seat two, after the wire is bent, the pin is inserted into the round hole in positioning seat two. The pin blocks the wire and prevents the wire from moving out of the V-groove when it rotates, ensuring that the wire is always in a bent state during the rotation process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure at the conductor of the present invention; Figure 3 This is a three-dimensional structural diagram of the side plate of the present invention; Figure 4 This is a three-dimensional structural diagram of the magnifying lens part of the present invention; Figure 5 This is a side sectional view of the conductor of the present invention; Figure 6 This is a cross-sectional view of the guide ring of the present invention; Figure 7 This is a three-dimensional structural diagram of the positioning part of the present invention; Figure 8 This is a three-dimensional structural diagram of the connecting block of the present invention; Figure 9 This is a three-dimensional structural diagram of the lower positioning part of the present invention; Figure 10This is a schematic diagram of the three-dimensional structure of the curved surface of the present invention.

[0024] In the diagram: 1. Workbench; 2. Detection mechanism; 3. Hydraulic cylinder; 4. Tension sensor; 5. Limiting shaft; 6. Round seat; 7. Flat-nose pliers; 8. Side plate; 9. Transparent plate; 10. Positioning bolt; 11. Guide ring; 12. Protrusion; 13. Locking bolt; 14. Magnifying glass; 15. Positioning block; 16. Upper positioning part; 17. Middle positioning part; 18. Lower positioning part; 19. Rotating shaft; 20. Torsion spring; 21. Connecting block; 22. Rib plate; 23. Positioning seat one; 24. Pin; 25. Positioning seat two; 26. V-groove; 27. Curved surface; 28. Screw; 29. ​​Limiting bolt; 30. Arc-shaped guide rail; 31. Arc-shaped block; 32. Wire; 33. Wire lug; 34. Limiting block.

[0025] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0026] The following is a detailed description of a 20kV cable accessory testing platform and testing method provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0027] like Figures 1-10 As shown, an embodiment of the present invention provides a 20kV cable accessory testing platform, including a workbench 1, and further comprising: The testing mechanism 2 includes a hydraulic cylinder 3 fixed to the top of the workbench 1 by a bracket. A tension sensor 4 is fixed to the telescopic end of the hydraulic cylinder 3. Flat-jaw pliers 7 are rotatably connected to the top of the workbench 1 and the bottom of the tension sensor 4. The two flat-jaw pliers 7 are used to clamp the bottom of the wire lug 33 and the wire 32, respectively. A side plate 8 is provided on the top of the workbench 1. A guide ring 11 is movably sleeved on the side plate 8. A magnifying glass 14 is embedded on the side of the guide ring 11 near the flat-jaw pliers 7. A locking bolt 13 is threaded to the side of the guide ring 11. The locking bolt 13 abuts against the side of the side plate 8. A transparent plate 9 is provided in the through groove opened on the side plate 8. Two flat-jaw pliers 7 are used to clamp the lug 33 and the wire 32 respectively before testing; a hydraulic cylinder 3 is used to move the tension sensor 4 upward to perform a pull-out test on the connection between the lug 33 and the wire 32; a magnifying glass 14 is used to observe whether the crimped joint on the lug 33 has cracked after the test; the lug 33 and / or the wire 32 are configured to rotate horizontally so that different positions of the crimped joint can be observed through the magnifying glass 14; the hydraulic cylinder 3 provides a stable pull-out force, which, together with the tension sensor 4, can accurately monitor the magnitude of the pull-out force, meeting the pull-out test requirements of the connection between the lug 33 and the wire 32. Two flat-jaw pliers 7 can securely clamp the bottom of the wire lug 33 and the wire 32 respectively, preventing slippage and detachment during the pulling process and ensuring the stability of the test. The guide ring 11 moves vertically along the side plate 8 and, together with the locking bolt 13, can achieve arbitrary height positioning, so that the magnifying glass 14 can be aimed at the crimping point of the wire lug 33 at different heights, magnifying tiny cracks and improving the accuracy of the test. The transparent plate 9 can shield and protect during the pull test, and at the same time facilitate the tester to quickly observe whether the wire lug 33 and the wire 32 have directly detached, improving the efficiency of the test. The wire lug 33 can rotate horizontally to achieve full circumferential observation of the crimping point and avoid the generation of blind spots in the test. A square block is fixed to the side of the transparent plate 9, and a positioning bolt 10 is threaded onto the square block. The positioning bolt 10 is inserted into a through hole opened on the side plate 8. The bottom of the transparent plate 9 is rotatably connected to the side plate 8 via a hinge. Before using the magnifying glass 14, the positioning bolt 10 is unscrewed from the through hole, and the transparent plate 9 is rotated downward to open the through slot. The positioning bolt 10 cooperates with the through hole to quickly fix the transparent plate 9, ensuring the protective stability of the transparent plate 9 during the pull-out test and preventing metal fragments from flying. The hinge connection allows the transparent plate 9 to rotate flexibly. When using the magnifying glass 14, the transparent plate 9 is rotated downward to avoid the transparent plate 9 obstructing the view and not interfering with the inspector's observation of the crimping point of the wire lug 33 through the magnifying glass 14, ensuring a clear field of view. The guide ring 11 has two protrusions 12 integrally formed on its side. The locking bolt 13 is located between the two protrusions 12. The protrusions 12 provide a stable force point for the movement of the guide ring 11. The inspector can pinch the protrusions 12 to steadily drive the guide ring 11 to move vertically along the side plate 8, which facilitates quick adjustment of the height of the magnifying glass 14 and makes the operation more convenient. The locking bolt 13 is located between the two protrusions 12, which can prevent the locking bolt 13 from rotating when the hand touches it when adjusting the guide ring 11, thereby preventing the guide ring 11 from getting stuck when it moves due to the rotation of the locking bolt 13.

[0028] like Figures 1-6As shown, in this embodiment, limit shafts 5 are fixed to the top of the workbench 1 and the bottom of the tension sensor 4. Two circular seats 6 are rotatably connected to each limit shaft 5. Two flat-nose pliers 7 are respectively fixed to the opposite surfaces of the two circular seats 6. During observation using a magnifying glass 14, the circular seats 6 drive the wire lug 33 to rotate horizontally. The limit shafts 5 provide stable rotational support for the circular seats 6, ensuring smooth rotation without deviation. Simultaneously, the cross-section of the limit shaft 5 is as follows: Figure 5 The T-shape shown ensures stable connection between the wire lug 33 and the wire 32 under the pull-out force during the pull-out test. When rotating the wire lug 33 and the wire 32, pinching the upper round base 6 will drive the upper flat-nose pliers 7 and the wire lug 33 and the wire 32 to rotate horizontally. When the wire 32 rotates, the lower flat-nose pliers 7 can drive the lower round base 6 to rotate around the lower limiting axis 5. The wire 32 can rotate smoothly in both the upper and lower directions, preventing the wire 32 from being excessively twisted during rotation, which would affect the subsequent observation by the magnifying glass 14.

[0029] like Figure 1 and Figure 3 As shown in this embodiment, the top of the workbench 1 and the top of the inner wall of the support are both fixed with arc-shaped guide rails 30. The top and bottom of the side plate 8 are both fixed with arc-shaped blocks 31. The arc-shaped blocks 31 are rotatably connected to the arc-shaped guide rails 30. The side of the side plate 8 has a square groove. The threaded groove at the bottom of the inner wall of the square groove is threaded with a limit bolt 29. The top of the workbench 1 has two limit holes. The limit bolt 29 is inserted into one of the limit holes. The side of the side plate 8 is provided with a positioning component. The positioning component is used for positioning the wire 32 before detection. The arc-shaped blocks 31 cooperate with the arc-shaped guide rails 30. The rotation of the side plate 8 allows it to switch between the rear and front sides of the wire 32. When the side plate 8 is located behind the wire 32, the positioning component can position the wire 32 to ensure it is vertical, preventing the wire 32 from tilting and affecting the pull-out test results. When the side plate 8 rotates to the front side of the wire 32, it can block metal debris that may fly during the pull-out test, thus protecting the safety of the testing personnel. The limit bolt 29, in conjunction with the limit hole, can fix the rotation position of the side plate 8, preventing accidental rotation of the side plate 8 during the test and ensuring positioning accuracy and protection effect.

[0030] like Figures 2-5 as well as Figures 7-10As shown, in this embodiment, the positioning component includes a positioning block 15. An internally threaded sleeve is fixed to the side of the side plate 8 away from the wire 32. A screw 28 is internally threaded onto the internally threaded sleeve. The screw 28 is rotatably connected to the side of the positioning block 15 near the side plate 8. A shaft seat is fixed to the side of the positioning block 15. The end of the screw 28 is fixedly connected to the inner wall of the shaft seat, enabling the screw 28 to rotate with the positioning block 15 via the shaft seat. The end of the screw 28 away from the positioning block 15 movably passes through the side plate 8 and is threaded into the internally threaded sleeve. A handwheel is fixed to the end of the screw 28 away from the positioning block 15. A guide sleeve is fixed to the side of the side plate 8 away from the wire 32. A guide rod is slidably connected inside the guide sleeve. The guide rod movably passes through the side plate 8 and is fixed to the side of the positioning block 15. A V-groove 26 is formed on the side of the positioning block 15 near the wire 32. Before testing, the wire 32 and the V-groove 26... The wall-fitting mechanism positions the wire 32. After the wire 32 and the wire lug 33 are respectively held by two flat-nose pliers 7, the side plate 8 is rotated from the rear side of the wire 32 to the front side of the wire 32. The wire 32 fits against the inner wall of the V-shaped groove 26 to achieve the positioning of the wire 32, ensuring that the wire 32 is in a vertical state and preventing the wire 32 from being tilted, which would cause uneven force distribution and affect the test results. Turning the handwheel can drive the screw 28 to rotate, thereby moving the positioning block 15 closer to or away from the wire 32. The guide rod and the guide sleeve cooperate to provide guidance for the movement of the positioning block 15, preventing the positioning block 15 from rotating with the screw 28 and ensuring the positioning accuracy of the positioning block 15 for the wire 32. Before the test, the positioning block 15 positions the wire 32. During the test, the positioning block 15 separates from the wire 32 without affecting the pull-out test results, thus balancing the reliability of the positioning of the wire 32 and the flexibility of the test. Positioning block 15 includes an upper positioning part 16, a middle positioning part 17, and a lower positioning part 18. A V-groove 26 is formed on the side of the upper positioning part 16, the middle positioning part 17, and the lower positioning part 18 near the wire 32. A connecting block 21 is fixed on the side of the upper positioning part 16 and the lower positioning part 18 near the side plate 8. A rotating shaft 19 is rotatably connected to the top and bottom of the middle positioning part 17. The rotating shaft 19 is fixed to the side of the connecting block 21. A torsion spring 20 is sleeved on the end of the rotating shaft 19. A limit block 34 is fixed on the side of the middle positioning part 17. One end of the torsion spring 20 is... The shaft is fitted into the notch at the end of the rotating shaft 19, with the other end abutting against the side of the limiting block 34 near the rotating shaft 19. Positioning seats 23 are fixed to the top and bottom of the middle positioning part 17. Two sets of ribs 22 are fixed to the opposite surfaces of the two connecting blocks 21, respectively. The two sets of ribs 22 are fixed to the side of the upper positioning part 16 and the middle positioning part 17 near the side plate 8. Pin holes are provided on the sides of the positioning seats 23 and the ribs 22. Before testing, a pin 24 is inserted into the pin hole. After testing, the pin 24 is pulled out of the pin hole, and the screw 28 is rotated to make the upper... Positioning part 16, middle positioning part 17, and lower positioning part 18 compress the wire 32, causing it to bend. As the wire 32 bends, it drives the upper positioning part 16 and lower positioning part 18 to rotate. The upper positioning part 16, middle positioning part 17, and lower positioning part 18 work together to achieve multi-point positioning of the wire 32, improving the stability of the wire 32's positioning. Before testing, the pin 24 is inserted into the pin holes of the positioning seat 23 and the rib plate 22 to fix the positions of the upper positioning part 16 and lower positioning part 18, preventing their rotation from affecting the positioning accuracy of the wire 32. After testing... Pull out the pin 24, the middle positioning part 17 squeezes the wire 32 to bend it, the wire 32 drives the upper positioning part 16 and the lower positioning part 18 to rotate around the rotating shaft 19, the torsion spring 20 deforms, realizes the rotation avoidance of the upper positioning part 16 and the lower positioning part 18, reduces the obstruction to the bending of the wire 32, and allows the wire 32 to bend to a greater extent, providing sufficient space for the broken copper wire at the connection between the wire lug 33 and the wire 32 to open, making it easier for the inspector to observe whether the copper wire is broken through the magnifying glass 14, and further improving the accuracy of the inspection; Curved surfaces 27 are provided on the inner wall of the V-groove 26 at the connection between the upper positioning part 16 and the middle positioning part 17, and at the connection between the lower positioning part 18 and the middle positioning part 17. The curved surfaces 27 eliminate the sharp edges of the inner wall of the V-groove 26, avoid the sharp edges from abutting against the insulation of the wire 32 and increasing the friction, reduce the resistance when the wire 32 rotates horizontally, and make the rotation of the wire 32 smoother and easier. This makes it easier for the inspectors to fully observe the cracking at the crimping point and the broken state of the copper wire at the bottom of the wire lug 33.

[0031] like Figures 7-9As shown in this embodiment, the heights of the upper positioning part 16 and the lower positioning part 18 are both greater than the height of the middle positioning part 17. This prevents the middle positioning part 17 from being too high and obstructing the bending of the conductor 32. It ensures that when the middle positioning part 17 squeezes the conductor 32, the conductor 32 can bend smoothly and reach the required degree of bending, providing sufficient space for the broken copper wire to open.

[0032] like Figures 7-10 As shown in this embodiment, both the upper positioning part 16 and the lower positioning part 18 are fixed with positioning base 25 on the side away from the side plate 8. The side of the positioning base 25 has a round hole. When the wire lug 33 is rotated, the pin 24 is inserted into the round hole on the positioning base 25. After the wire 32 is bent, the pin 24 is inserted into the round hole of the positioning base 25, which can limit and block the wire 32, preventing the wire 32 from moving out of the V-groove 26 during horizontal rotation, ensuring that the wire 32 is always in a bent state, ensuring that the tester can stably observe whether the copper wire at the bottom of the wire lug 33 is broken, avoiding omissions or misjudgments due to the displacement of the wire 32, and further improving the stability and accuracy of the test.

[0033] A testing method for 20kV cable accessories, applied to the aforementioned 20kV cable accessory testing platform, includes the following operations: S1: Clamp the lug 33 in the upper flat-jaw pliers 7, clamp the bottom of the wire 32 in the lower flat-jaw pliers 7, start the hydraulic cylinder 3 to drive the tension sensor 4 to move upward, apply tension to the connection between the lug 33 and the wire 32, and determine whether the connection has fallen off or shifted. S2: If no detachment or displacement occurs at the connection, observe whether there are cracks at the crimping point on the wire lug 33 through the magnifying glass 14 on the guide ring 11. During the observation, rotate the round seat 6 to drive the wire lug 33 to rotate in the horizontal direction to observe different positions of the crimping point. S3: If no cracks appear at the crimping point, control the hydraulic cylinder 3 to move the upper flat-jaw pliers 7 downward, so that the wire 32 changes from a taut state to a slack state. Then drive the positioning block 15 to move closer to the wire 32, so that the wire 32 bends. Then observe through the magnifying glass 14 whether the copper wire at the bottom of the wire lug 33 is broken.

[0034] Working principle: The wire 32 is fitted into the V-groove 26 of the positioning block 15 on the front side of the side plate 8. The wire 32 is positioned vertically by the V-groove 26. Then, the wire lug 33 is clamped and fixed in the upper flat-nose clamp 7, and the bottom of the wire 32 is clamped and fixed in the lower flat-nose clamp 7. Next, the screw 28 is turned to move the positioning block 15 away from the wire 32. The guide rod slides along the guide sleeve, providing guidance for the movement of the positioning block 15. After separating from the wire 32, the limiting bolt 29 is rotated to move it out of the limiting hole on the rear side of the wire 32. Then the side plate 8 is rotated from the rear side of the wire 32 to the front side of the wire 32. When the side plate 8 rotates, it drives the arc-shaped blocks 31 at its top and bottom to rotate along the inner wall of the arc-shaped guide rail 30. After the side plate 8 is rotated to the front side of the wire 32, the limiting bolt 29 is tightened and inserted into the limiting hole on the front side of the wire 32 to achieve the positioning of the side plate 8 and prevent the side plate 8 from rotating during the detection process. Then, a pull-out test is performed. The hydraulic cylinder 3 is activated. The extension end of the hydraulic cylinder 3, through the cooperation of the tension sensor 4, the round seat 6 and the limit shaft 5, drives the upper flat-jaw pliers 7 to apply an upward pulling force to the wire lug 33, thereby realizing the pull-out test at the connection between the wire lug 33 and the wire 32. During the test, the side plate 8 is shielded in front of the wire 32, which can block the flying metal fragments generated by the sudden detachment of the wire 32 and the wire lug 33, thus protecting the test personnel. After the pull-out test is completed, observe directly through the transparent plate 9 whether the connection between the wire 32 and the lug 33 has fallen off. If it has fallen off, there is no need to observe with the magnifying glass 14. If it has not fallen off, unscrew the positioning bolt 10 on the square block of the transparent plate 9 from the through hole, and then rotate the transparent plate 9 downward to open the through slot. Avoid the transparent plate 9 interfering with the inspector's observation of the position of the lug 33 with the magnifying glass 14. Then loosen the locking bolt 13 on the side of the guide ring 11 so that the end of the locking bolt 13 is separated from the side of the side plate 8. Pinch the protrusion 12 on the side of the guide ring 11 with your fingers and move the guide ring 11 vertically along the side plate 8. Move the magnifying glass 14 to the height of the corresponding crimping point of the lug 33. The inspector observes through the magnifying glass 14 whether there are cracks at the crimping point. During the observation, the round seat 6 can be rotated horizontally so that the round seat 6 rotates around the limiting axis 5. At the same time, the flat-nose pliers 7 above drive the lug 33 to rotate, so that different positions of the crimping point can be observed in the horizontal direction. When it is observed that no cracks have been generated at the crimping point, the guide ring 11 is moved down so that the magnifying glass 14 is aligned with the bottom of the wire nose 33. Then, the hydraulic cylinder 3 is activated to move the upper flat-jaw pliers 7 down, so that the wire 32 changes from a taut to a slack state. Next, the pin 24 is pulled out from the pin hole of the positioning seat 23 and the rib plate 22. The screw 28 is turned in the opposite direction to move the positioning block 15 closer to the wire 32. The middle positioning part 17 on the positioning block 15 presses the wire 32 and bends it. When the wire 32 bends, it drives the upper positioning part 16 and the lower positioning part 18 to rotate around the corresponding pivot 19. The torsion spring 20 deforms accordingly. The rotation of the upper positioning part 16 and the lower positioning part 18 can reduce the obstruction to the bending of the wire 32, so that the wire 32 bends more, providing sufficient space for the broken copper wire to open. At the same time, the height of the upper positioning part 16 and the lower positioning part 18 is greater than the height of the middle positioning part 17. To prevent the high height of the positioning part 17 from affecting the bending degree of the wire 32, and to ensure that the wire 32 can stably produce a large degree of bending, after the wire 32 is bent into place, the pin 24 is inserted into the round hole of the positioning seat 25 to limit the wire 32. Then, the round seat 6 is rotated to make the wire lug 33 and the wire 32 rotate. During the rotation, the copper wire at the bottom of the wire lug 33 is observed through the magnifying glass 14 to see if it is broken. If cracks appear at the crimping point or the copper wire is broken, it means that the pull test of the wire lug 33 is unqualified. The pin 24 limits the wire 32 to prevent the wire 32 from moving out of the V-groove 26 during the rotation. After all tests are completed, first pull the pin 24 out of the positioning seat 25, then turn the screw 28 to separate the positioning block 15 from the wire 32. After separation, the upper positioning part 16 and the lower positioning part 18 rotate in opposite directions under the elastic force of the torsion spring 20 and respectively fit against the top and bottom of the middle positioning part 17. Insert the pin 24 back into the pin hole of the positioning seat 23 and the rib plate 22, then move the guide ring 11 upward to move the magnifying glass 14 to the height of the upper round seat 6, and then tighten the locking bolt 13. After fixing the guide ring 11 and the magnifying glass 14, rotate the transparent plate 9 upward into the through groove and screw the positioning bolt 10 into the through hole to fix the transparent plate 9. Then, screw the limiting bolt 29 out of the limiting hole on the front side of the wire 32, rotate the side plate 8 from the front side of the wire 32 back to the rear side of the wire 32, and screw the limiting bolt 29 into the limiting hole on the rear side of the wire 32 to position the side plate 8. Then, loosen the two flat-nose pliers 7 and remove the wire lug 33 and the wire 32 to complete the entire testing process.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A 20kV cable accessory testing platform, comprising a workbench (1), characterized in that, Also includes: The testing mechanism (2) includes a hydraulic cylinder (3) fixed to the top of the workbench (1) by a bracket. A tension sensor (4) is fixed to the telescopic end of the hydraulic cylinder (3). Flat-nose pliers (7) are rotatably connected to the top of the workbench (1) and the bottom of the tension sensor (4). The two flat-nose pliers (7) are used to clamp the bottom of the wire lug (33) and the wire (32) respectively. A side plate (8) is provided on the top of the workbench (1). A guide ring (11) is movably sleeved on the side plate (8). A magnifying glass (14) is embedded on the side of the guide ring (11) near the flat-nose pliers (7). A locking bolt (13) is threaded to the side of the guide ring (11). The locking bolt (13) abuts against the side of the side plate (8). A transparent plate (9) is provided in the through groove opened on the side plate (8). The two flat-jaw pliers (7) are used to clamp the lug (33) and the wire (32) before testing, respectively; the hydraulic cylinder (3) is used to drive the tension sensor (4) to move upward to perform a pull test on the connection between the lug (33) and the wire (32); the magnifying glass (14) is used to observe whether the crimping on the lug (33) is cracked after the test is completed; the lug (33) and / or the wire (32) are set to be able to rotate in the horizontal direction so that different positions of the crimping can be observed through the magnifying glass (14).

2. The 20kV cable accessory testing and inspection platform according to claim 1, characterized in that, Limiting shafts (5) are fixed at the top of the workbench (1) and the bottom of the tension sensor (4). Round seats (6) are rotatably connected to the two limiting shafts (5). Two flat-nose pliers (7) are fixed on the opposite surfaces of the two round seats (6). During the observation process using a magnifying glass (14), the wire lugs (33) are rotated in the horizontal direction by the round seats (6).

3. The 20kV cable accessory testing and inspection platform according to claim 1, characterized in that, The transparent plate (9) has a block fixed on its side, and a positioning bolt (10) is threaded onto the block. The positioning bolt (10) is inserted into the through hole opened on the side plate (8). The bottom of the transparent plate (9) is rotatably connected to the side plate (8) via a hinge. Before using a magnifying glass (14), the positioning bolt (10) is unscrewed from the through hole. The transparent plate (9) is rotated downwards to open the through slot. The side of the guide ring (11) has two protrusions (12) integrally formed. The locking bolt (13) is located between the two protrusions (12).

4. The 20kV cable accessory testing and inspection platform according to claim 1, characterized in that, The top of the workbench (1) and the top of the inner wall of the support are both fixed with arc-shaped guide rails (30). The top and bottom of the side plate (8) are both fixed with arc-shaped blocks (31). The arc-shaped blocks (31) are rotatably connected in the arc-shaped guide rails (30). The side plate (8) has a square groove. The threaded groove at the bottom of the inner wall of the square groove is threaded with a limit bolt (29). The top of the workbench (1) has two limit holes. The limit bolt (29) is inserted into one of the limit holes. The side plate (8) has a positioning component. The positioning component is used for positioning the wire (32) before detection.

5. The 20kV cable accessory testing and inspection platform according to claim 4, characterized in that, The positioning assembly includes a positioning block (15), an internal threaded sleeve fixed on the side of the side plate (8) away from the wire (32), a screw (28) internally threadedly connected to the internal threaded sleeve, a screw (28) rotatably connected to the side of the positioning block (15) near the side plate (8), a screw (28) movably passing through the side plate (8) and threadedly connected to the internal threaded sleeve at the end of the screw (28) away from the positioning block (15), a handwheel fixed at the end of the screw (28) away from the positioning block (15), and a handwheel fixed on the side of the side plate (8) away from the wire (32). A guide sleeve is provided, and a guide rod is slidably connected inside the guide sleeve. The guide rod moves through the side plate (8) and is fixed to the side of the positioning block (15). A V-shaped groove (26) is provided on the side of the positioning block (15) near the wire (32). Before testing, the wire (32) is positioned by fitting the inner wall of the V-shaped groove (26). After the wire (32) and the wire lug (33) are clamped by two flat-nose pliers (7), the side plate (8) is rotated from the back of the wire (32) to the front of the wire (32).

6. The 20kV cable accessory testing and inspection platform according to claim 5, characterized in that, The positioning block (15) includes an upper positioning part (16), a middle positioning part (17), and a lower positioning part (18). A V-groove (26) is formed on the side of the upper positioning part (16), the middle positioning part (17), and the lower positioning part (18) near the wire (32). A connecting block (21) is fixed on the side of the upper positioning part (16) and the lower positioning part (18) near the side plate (8). A rotating shaft (19) is rotatably connected to the top and bottom of the middle positioning part (17). The rotating shaft (19) is fixed to the side of the connecting block (21). A torsion spring (20) is sleeved on the end of the rotating shaft (19). A limit block (34) is fixed on the side of the middle positioning part (17). One end of the torsion spring (20) is inserted into the notch at the end of the rotating shaft (19), and the other end abuts against the limit block (34) near the rotating shaft (19). On one side of the shaft (19), the top and bottom of the middle positioning part (17) are fixed with positioning seat 1 (23). The two connecting blocks (21) are respectively fixed with two sets of stiffening plates (22). The two sets of stiffening plates (22) are respectively fixed on the side of the upper positioning part (16) and the middle positioning part (17) near the side plate (8). The positioning seat 1 (23) and the stiffening plate (22) are respectively provided with pin holes. Before the test, a pin (24) is inserted into the pin hole. After the test, the pin (24) is pulled out from the pin hole. The screw (28) is rotated to make the upper positioning part (16), the middle positioning part (17) and the lower positioning part (18) squeeze the wire (32) to make the wire (32) bend. When the wire (32) bends, it drives the upper positioning part (16) and the lower positioning part (18) to rotate.

7. The 20kV cable accessory testing and inspection platform according to claim 6, characterized in that, The heights of the upper positioning part (16) and the lower positioning part (18) are both greater than the height of the middle positioning part (17).

8. The 20kV cable accessory testing and inspection platform according to claim 6, characterized in that, The inner wall of the V-groove (26) is provided with curved surfaces (27) at the connection between the upper positioning part (16) and the middle positioning part (17) and at the connection between the lower positioning part (18) and the middle positioning part (17).

9. The 20kV cable accessory testing and inspection platform according to claim 6, characterized in that, The upper positioning part (16) and the lower positioning part (18) are both fixed with positioning seat two (25) on the side away from the side plate (8). The side of the positioning seat two (25) has a round hole. When the wire lug (33) is rotated, the pin (24) is inserted into the round hole on the positioning seat two (25).

10. A method for testing 20kV cable accessories, characterized in that, The 20kV cable accessory testing and inspection platform as described in any one of claims 1-9 includes the following operations: S1: Clamp the lug (33) in the upper flat-jaw pliers (7), clamp the bottom of the wire (32) in the lower flat-jaw pliers (7), start the hydraulic cylinder (3) to drive the tension sensor (4) to move upward, apply tension to the connection between the lug (33) and the wire (32), and determine whether the connection has fallen off or shifted. S2: If no detachment or displacement occurs at the connection, observe whether there are cracks at the crimping point on the wire lug (33) through the magnifying glass (14) on the guide ring (11). During the observation, rotate the round seat (6) to drive the wire lug (33) to rotate in the horizontal direction to observe different positions of the crimping point. S3: If no cracks appear at the crimping point, control the hydraulic cylinder (3) to move the upper flat-jaw pliers (7) down, so that the wire (32) changes from a taut state to a slack state. Then drive the positioning block (15) to move closer to the wire (32) so that the wire (32) bends. Then observe whether the copper wire at the bottom of the wire lug (33) is broken through the magnifying glass (14).

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