A device for detecting the insulation performance of a power cable

Abstract

The application belongs to the technical field of cable detection equipment, and discloses a power cable insulation performance detection device, which comprises an environment box and a heating device; an adjustable winding mechanism is arranged in the environment box; the adjustable winding mechanism comprises a supporting shaft, a first motor, a variable-diameter supporting assembly and a variable-distance spiral limiting assembly; a synchronous detection unwinding mechanism is further arranged in the environment box and moves along the supporting shaft in the radial direction; in the above manner, the synchronous detection unwinding mechanism moves along the supporting shaft in the axial direction and continuously controls the unwinding of the cable from the reel, the first motor drives the supporting shaft to rotate, so that the cable is spirally wound outside the variable-diameter supporting assembly under the limiting action of the variable-distance spiral limiting assembly or is recovered to the reel, the cable winding and unwinding operation is repeated for multiple times, the heating device changes the temperature in the environment box, and the synchronous detection unwinding mechanism detects the defects of the cable insulation layer in real time, so that the performance detection function of the cable insulation layer is realized.

Description

Technical Field

[0001] This invention relates to the field of cable testing equipment technology, and more specifically to a device for testing the insulation performance of power cables. Background Technology

[0002] Insulation performance testing of power cables is a core component in ensuring the safe and stable operation of power systems. Testing mainly focuses on several key aspects, including insulation resistance, withstand voltage, partial discharge, and dielectric loss. The testing requirements and standards vary depending on the type of cable and its operational status.

[0003] CN116625867A discloses a cable insulation sheath performance testing device, including a heating box, a U-shaped frame, a spiral shaft, a winding mechanism, and a spreading mechanism. In this invention, the two clamping components first insert alignment rods into the openings at both ends of the insulating sheath. Then, the cooperation between the drive block and the mating block causes the corresponding clamping plates at the front and rear to clamp the insulating sheath. Simultaneously, the rotation plate on the left side allows the cable insulating sheath to be initially wound onto the spreading plate, which facilitates subsequent heating in high-temperature environments and subsequent winding and stretching after heating. Through the cooperation between all the synchronous components, the limiting plate drives the corresponding insulating sheath on it to open, so that the degree of bending and stretching of the cable insulating sheath in the lateral direction can be controlled and changed, which is convenient for simulating different bending conditions of the insulating sheath and ensuring the perfection of thermal shock testing. However, this device can only meet the static bending resistance test of the cable. In actual use, the cable usually faces repeated and dynamic bending conditions. During the energization process, local fatigue will cause insulation performance problems. This device is difficult to simulate the real, multi-mode cable bending resistance insulation performance test.

[0004] Based on this, the present invention designs a power cable insulation performance testing device to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a power cable insulation performance testing device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A device for testing the insulation performance of power cables, comprising an environmental chamber; A heating device is fixedly installed at the upper end of the environmental chamber; The environmental chamber is equipped with an adjustable winding mechanism, which includes a support shaft, a first motor, a variable diameter support assembly, and a variable pitch spiral limiting assembly. The support shaft is rotatably mounted inside the environmental chamber via bearings. The first motor is fixedly mounted on the outer wall of the environmental chamber, and the output end of the first motor is fixedly connected to the support shaft. The outer wall of the support shaft is connected to the variable diameter support assembly, and the outer wall of the variable diameter support assembly is connected to the variable pitch spiral limiting assembly. The bottom of the environmental chamber is also fixedly installed with a first linear module. The moving end of the first linear module is equipped with a synchronous detection unwinding mechanism. The first linear module is used to drive the synchronous detection unwinding mechanism to move radially along the support shaft. The output end of the synchronous detection unwinding mechanism is equipped with a wire reel.

[0007] Furthermore, the variable diameter support assembly includes a support frame, a support plate, and an adjustment assembly. Two support frames are provided and symmetrically fixedly installed on the front and rear sides of the support shaft. Multiple support plates are arranged in a circumferential array between the two support frames, and the ends of the support plates are connected to the support frames in a radially sliding manner along the support shaft through limiting assemblies. The support plates are arc-shaped. Two adjustment assemblies are also provided and symmetrically installed on the front and rear sides of the support shaft. The adjustment assemblies are connected to all the support plates.

[0008] Furthermore, the adjustment assembly includes a connecting arm and an adjustment sleeve. The adjustment sleeve is rotatably mounted on the outer wall of the support shaft. The extension end of the adjustment sleeve has multiple connecting arms distributed in a circumferential array, each corresponding to a support plate. The two ends of the connecting arms are respectively hinged to the extension end of the adjustment sleeve and the inner wall of the support plate.

[0009] Furthermore, the variable pitch spiral limiting assembly includes a limiting block, a limiting groove, a telescopic rod, an adjusting ring, and a scissor assembly. Multiple adjusting rings are provided and equidistantly slidably connected to the outside of the support shaft. A telescopic rod is fixedly installed on the outer wall of the adjusting sleeve, and the telescopic end of the telescopic rod is fixedly connected to the limiting block. A limiting groove is provided on the support plate to limit and slide in connection with the limiting block. All adjusting rings are connected through the scissor assembly.

[0010] Furthermore, along the axial direction of the support shaft, the limiting blocks are distributed in a spiral pattern.

[0011] Furthermore, the synchronous detection unwinding mechanism includes a mounting frame, an unwinding assembly, and a cable detection assembly. The mounting frame is fixedly installed on the moving end of the first linear module, and the unwinding assembly and the cable detection assembly are installed inside the mounting frame, with the cable detection assembly located between the unwinding assembly and the support shaft.

[0012] Furthermore, the cable detection component includes a second linear module, a cable limiting component, and a detection magnetoelectric coil. The second linear module is fixedly installed inside the mounting frame, and two sets of cable limiting components are installed on the moving end of the second linear module. The detection magnetoelectric coil is fixedly installed on the moving end of the mounting frame and located between the two sets of cable limiting components.

[0013] Furthermore, a first conductive slip ring is fixedly installed on the support shaft, and a second conductive slip ring is fixedly installed on the connecting shaft.

[0014] Compared with the prior art, the advantages of this invention are as follows: A reel containing the power cable to be tested is installed on a synchronous detection unwinding mechanism. The cable is fixed to the support shaft. Then, the first motor and the first linear module are started. The first linear module drives the synchronous detection unwinding mechanism to move axially along the support shaft and continuously controls the cable unwinding from the reel. Simultaneously, the first motor drives the support shaft to rotate, causing the cable to spirally wind around the outside of the variable diameter support component under the limiting action of the variable pitch spiral limiting component, simulating the bending state of the cable. Subsequently, the first linear module drives the synchronous detection unwinding mechanism to reset, and the first motor drives the support shaft to reverse, causing the cable wound around the outside of the variable diameter support component to be retrieved onto the reel. This cable winding and unwinding operation is repeated multiple times. A heating device is used to change the temperature inside the chamber, and the synchronous detection unwinding mechanism detects defects in the cable insulation layer in real time, achieving the function of performance testing of the cable insulation layer. Furthermore, the diameter of the spiral winding of the cable can be changed by the variable diameter support component, and the pitch of the spiral winding can be changed by the variable pitch spiral limiting component, simulating different bending states of the cable and meeting the multi-mode insulation performance testing requirements of the cable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This invention provides a three-dimensional representation of a power cable insulation performance testing device. Figure 1 .

[0017] Figure 2 This is a right view of the right wall of the environmental enclosure of a power cable insulation performance testing device according to the present invention.

[0018] Figure 3 This is a perspective view of a hidden environmental box for a power cable insulation performance testing device according to the present invention.

[0019] Figure 4 This is a front view of a hidden environmental box for testing the insulation performance of power cables according to the present invention.

[0020] Figure 5 This is a perspective view of the synchronous detection unwinding mechanism of the present invention.

[0021] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0022] Figure 7 This is a perspective view of the adjustable winding mechanism of the present invention.

[0023] Figure 8 This is a partial perspective view of the adjustable winding mechanism of the present invention.

[0024] Figure 9 for Figure 7 Enlarged view of point B in the middle.

[0025] The labels in the diagram represent: 1. Environmental chamber; 2. Heating device; 3. Adjustable winding mechanism; 31. Support shaft; 32. First motor; 33. Variable diameter support assembly; 331. Support frame; 332. Support plate; 333. Connecting arm; 334. Adjusting sleeve; 335. First fastener; 336. Limiting assembly; 34. Variable pitch spiral limiting assembly; 341. Limiting block; 342. Limiting groove; 343. Telescopic rod; 344. 345. Adjusting ring; 346. Second fastener; 347. Connecting rod; 348. Pin; 4. Synchronous detection unwinding mechanism; 41. Mounting frame; 42. Second motor; 43. Connecting shaft; 44. Second linear module; 45. Cable limiting assembly; 451. Horizontal limiting roller; 452. Vertical limiting roller; 453. Connecting plate; 46. Detection magnetocoil; 5. Wire reel; 6. First linear module; 7. First conductive slip ring; 8. Second conductive slip ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0028] In some embodiments, please refer to the accompanying drawings. Figures 1-9 A device for testing the insulation performance of power cables, comprising an environmental chamber 1; A heating device 2 is fixedly installed on the upper end of the environmental chamber 1. The heating device 2 is a circulating hot air blower. An adjustable winding mechanism 3 is installed inside the environmental chamber 1. The adjustable winding mechanism 3 includes a support shaft 31, a first motor 32, a variable diameter support assembly 33, and a variable pitch spiral limiting assembly 34. The support shaft 31 is rotatably mounted inside the environmental chamber 1 via bearings. The first motor 32 is fixedly mounted on the outer wall of the environmental chamber 1, and the output end of the first motor 32 is fixedly connected to the support shaft 31. The outer wall of the support shaft 31 is connected to the variable diameter support assembly 33, and the outer wall of the variable diameter support assembly 33 is connected to the variable pitch spiral limiting assembly 34. The bottom of the environmental chamber 1 is also fixedly installed with a first linear module 6. The moving end of the first linear module 6 is equipped with a synchronous detection unwinding mechanism 4. The first linear module 6 is used to drive the synchronous detection unwinding mechanism 4 to move radially along the support shaft 31. The output end of the synchronous detection unwinding mechanism 4 is equipped with a wire spool 5.

[0029] In this invention, a reel 5 containing the power cable to be tested is mounted on a synchronous detection and unwinding mechanism 4. The cable is fixed to a support shaft 31. Then, a first motor 32 and a first linear module 6 are started. The first linear module 6 drives the synchronous detection and unwinding mechanism 4 to move axially along the support shaft 31 and continuously controls the reel 5 to unwind the cable. At the same time, the first motor 32 drives the support shaft 31 to rotate, so that the cable is spirally wound around the outside of the variable diameter support component 33 under the limiting action of the variable pitch spiral limiting component 34, simulating the bending state of the cable. Then, the first linear module 6 drives the synchronous detection and unwinding mechanism 4 to reset. The first motor 32 drives the support shaft 31 to reverse, causing the cable wound on the outside of the variable diameter support assembly 33 to be retracted onto the reel 5. The cable winding and unwinding operations are repeated multiple times. In conjunction with the heating device 2, the temperature inside the ambient chamber 1 is changed. The defects of the cable insulation layer are detected in real time through the synchronous detection unwinding mechanism 4, realizing the performance testing function of the cable insulation layer. In addition, the diameter of the cable spiral winding can be changed by the variable diameter support assembly 33, and the pitch of the cable spiral winding can be changed by the variable pitch spiral limit assembly 34, simulating different bending states of the cable and meeting the multi-mode insulation performance testing requirements of the cable.

[0030] The variable diameter support assembly 33 includes a support frame 331, support plates 332, and an adjustment assembly. Two support frames 331 are provided and symmetrically fixedly installed on the front and rear sides of the support shaft 31. Multiple support plates 332 are arranged in a circumferential array between the two support frames 331, and the ends of the support plates 332 are connected to the support frames 331 by means of a limiting assembly 336 that can slide radially along the support shaft 31. The support plates 332 are arc-shaped. Two adjustment assemblies are also provided and symmetrically installed on the front and rear sides of the support shaft 31. The adjustment assemblies are connected to all the support plates 332. The adjustment assembly includes a connecting arm 333 and an adjustment sleeve 334. The adjustment sleeve 334 is rotatably mounted on the outer wall of the support shaft 31. The extended end of the adjustment sleeve 334 has multiple connecting arms 333 arranged in a circumferential array, each corresponding to a support plate 332. The two ends of the connecting arms 333 are respectively hinged to the extended end of the adjustment sleeve 334 and the inner wall of the support plate 332. By rotating the adjustment sleeve 334, the support plate 332 can be moved radially along the support frame 331 under the action of the connecting arms 333, thereby adjusting the distance between the support plate 332 and the support shaft 31.

[0031] In some embodiments, the adjusting sleeve 334 is fitted with a first fastener 335 for fixing the adjusting sleeve 334 and the support shaft 31 relative to each other.

[0032] In some embodiments, the adjusting sleeve 334 may adopt a hollow rotating platform structure, so that the adjusting sleeve 334 has an electrically controlled rotation function.

[0033] In some embodiments, the limiting component 336 adopts a slide rail slider limiting structure.

[0034] The variable-pitch spiral limiting assembly 34 includes a limiting block 341, a limiting groove 342, a telescopic rod 343, an adjusting ring 344, and a scissor assembly. Multiple adjusting rings 344 are equidistantly slidably connected to the outside of the support shaft 31. A telescopic rod 343 is fixedly installed on the outer wall of the adjusting sleeve 334. The telescopic end of the telescopic rod 343 is fixedly connected to the limiting block 341. A limiting groove 342 is provided on the support plate 332, which is slidably connected to the limiting block 341. All adjusting rings 344 are connected via the scissor assembly. The scissor lift assembly is formed by hinged ends of multiple scissor lift pieces. Each scissor lift piece includes two connecting rods 346 and a pin 347. The middle part of the connecting rods 346 is hinged through the pin 347, and the pin 347 is fixedly connected to each adjusting ring 344. In this embodiment, the limiting block 341 is U-shaped and is used to limit the cable wound around the outside of the support plate 332; In this embodiment, the limiting blocks 341 are arranged in a spiral pattern along the axial direction of the support shaft 31, so that the cable can be wound around the outside of the support plate 332 in a spiral pattern with a preset pitch.

[0035] In some embodiments, the foremost adjusting ring 344 is fixedly connected to the front end of the support shaft 31, and the rearmost adjusting ring 344 is provided with a second fastener 345 for fixing the adjusting ring 344 and the support shaft 31 relative to each other. By sliding the rearmost adjusting ring 344, the spacing of all adjusting rings 344 can be changed synchronously under the action of the scissor lift assembly to adjust the pitch of the cable wound around the outside of the support plate 332.

[0036] In some embodiments, the adjusting ring 344 at the rear end can be connected to a servo push rod, so that the adjusting ring 344 has the function of electrically controlled distance adjustment.

[0037] In some embodiments, the first fastener 335 and the second fastener 345 may be fastening bolts.

[0038] In this invention, by rotating the adjusting sleeve 334, the support plate 332 can be moved radially along the support shaft 31 by the limiting component 336 under the pushing and pulling of the connecting arm 333, changing the distance between the support plate 332 and the support shaft 31. With the cooperation of the telescopic rod 343, the limiting block 341 and the support plate 332 move together. The sliding adjusting ring 344 can synchronously change the distance between all adjusting rings 344 under the action of the scissor fork component. The two work together to adjust the spiral configuration of the wound cable, thereby adjusting its diameter and pitch.

[0039] The synchronous detection unwinding mechanism 4 includes a mounting frame 41, an unwinding assembly, and a cable detection assembly. The mounting frame 41 is fixedly installed on the moving end of the first linear module 6. The unwinding assembly and the cable detection assembly are installed inside the mounting frame 41, and the cable detection assembly is located between the unwinding assembly and the support shaft 31. The unwinding assembly includes a second motor 42 and a connecting shaft 43. The connecting shaft 43 is rotatably mounted inside the mounting frame 41 via a bearing. The connecting shaft 43 is detachably connected to the coil 5. The second motor 42 is fixedly connected to the mounting frame 41. The output end of the second motor 42 is fixedly connected to the connecting shaft 43. The cable detection assembly includes a second linear module 44, a cable limiting assembly 45, and a detection magnetoelectric coil 46. The second linear module 44 is fixedly installed inside the mounting frame 41. Two sets of cable limiting assemblies 45 are installed on the moving end of the second linear module 44. The detection magnetoelectric coil 46 is fixedly installed on the moving end of the mounting frame 41 and located between the two sets of cable limiting assemblies 45. The cable limiting assembly 45 includes a horizontal limiting roller 451, a vertical limiting roller 452, and a connecting plate 453. The connecting plate 453 is fixedly mounted on the moving end of the second linear module 44. The two horizontal limiting rollers 451 are rotatably mounted on the upper side of the connecting plate 453 and distributed back and forth. The two vertical limiting rollers 452 are also rotatably mounted on the connecting plate 453 and distributed up and down. The horizontal limiting rollers 451 and the vertical limiting rollers 452 cooperate to form a limiting gap for the cable.

[0040] In this invention, the second motor 42 drives the connecting shaft 43 to rotate, which can control the winding and unwinding operation of the cable reel 5. During the winding and unwinding process, the cable passes through the limiting gap of the two sets of cable limiting components 45 and the inside of the detection magneto coil 46, so that the cable can be automatically sorted and orderly wound and unwound. During the winding and unwinding process, the detection magneto coil 46 realizes non-contact detection of the cable to determine whether the insulation performance of the cable meets the preset requirements.

[0041] A first conductive slip ring 7 is fixedly installed on the support shaft 31, and a second conductive slip ring 8 is fixedly installed on the connecting shaft 43. The two ends of the cable to be tested are connected to the first conductive slip ring 7 and the second conductive slip ring 8 respectively, so that voltage can be applied to the cable and the accuracy of the cable insulation performance test can be improved.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the insulation performance of power cables, comprising an environmental chamber (1), characterized in that: A heating device (2) is fixedly installed on the upper end of the environmental chamber (1); The environmental chamber (1) is equipped with an adjustable winding mechanism (3). The adjustable winding mechanism (3) includes a support shaft (31), a first motor (32), a variable diameter support assembly (33), and a variable pitch spiral limiting assembly (34). The support shaft (31) is mounted inside the environmental chamber (1) via bearings and rotation. The first motor (32) is fixedly mounted on the outer wall of the environmental chamber (1). The output end of the first motor (32) is fixedly connected to the support shaft (31). The outer wall of the support shaft (31) is connected to the variable diameter support assembly (33), and the outer wall of the variable diameter support assembly (33) is connected to the variable pitch spiral limiting assembly (34). The bottom of the environmental chamber (1) is also fixedly installed with a first linear module (6). The moving end of the first linear module (6) is equipped with a synchronous detection unwinding mechanism (4). The first linear module (6) is used to drive the synchronous detection unwinding mechanism (4) to move radially along the support shaft (31). The output end of the synchronous detection unwinding mechanism (4) is equipped with a coil (5).

2. The power cable insulation performance testing device according to claim 1, characterized in that, The variable diameter support assembly (33) includes a support frame (331), a support plate (332), and an adjustment assembly. Two support frames (331) are provided and symmetrically fixed on the front and rear sides of the support shaft (31). Multiple support plates (332) are arranged in a circumferential array between the two support frames (331), and the ends of the support plates (332) can be connected to the support frame (331) radially along the support shaft (31) through a limiting assembly (336). The support plates (332) are set in an arc shape. Two adjustment assemblies are also provided and symmetrically installed on the front and rear sides of the support shaft (31). The adjustment assemblies are connected to all the support plates (332).

3. The power cable insulation performance testing device according to claim 2, characterized in that, The adjustment assembly includes a connecting arm (333) and an adjustment sleeve (334). The adjustment sleeve (334) is rotatably mounted on the outer wall of the support shaft (31). The extension end of the adjustment sleeve (334) has multiple connecting arms (333) that correspond one-to-one with the support plate (332) in a circular array. The two ends of the connecting arm (333) are respectively hinged to the extension end of the adjustment sleeve (334) and the inner wall of the support plate (332).

4. The power cable insulation performance testing device according to claim 3, characterized in that, The variable pitch spiral limiting assembly (34) includes a limiting block (341), a limiting groove (342), a telescopic rod (343), an adjusting ring (344), and a scissor assembly. Multiple adjusting rings (344) are provided and equidistantly slidably connected to the outside of the support shaft (31). The telescopic rod (343) is fixedly installed on the outer wall of the adjusting sleeve (334). The telescopic end of the telescopic rod (343) is fixedly connected to the limiting block (341). The support plate (332) is provided with a limiting groove (342) that is slidably connected to the limiting block (341). All adjusting rings (344) are connected through the scissor assembly.

5. The power cable insulation performance testing device according to claim 4, characterized in that, Along the axial direction of the support shaft (31), the limiting blocks (341) are distributed in a spiral pattern.

6. The power cable insulation performance testing device according to claim 1, characterized in that, The synchronous detection unwinding mechanism (4) includes a mounting frame (41), an unwinding component and a cable detection component. The mounting frame (41) is fixedly installed on the moving end of the first linear module (6). The unwinding component and the cable detection component are installed inside the mounting frame (41), and the cable detection component is located between the unwinding component and the support shaft (31).

7. The power cable insulation performance testing device according to claim 6, characterized in that, The cable detection assembly includes a second linear module (44), a cable limiting assembly (45), and a detection magnetoelectric coil (46). The second linear module (44) is fixedly installed inside the mounting frame (41). Two sets of cable limiting assemblies (45) are installed on the moving end of the second linear module (44). The detection magnetoelectric coil (46) is fixedly installed on the moving end of the mounting frame (41) and located between the two sets of cable limiting assemblies (45).

8. The power cable insulation performance testing device according to claim 7, characterized in that, A first conductive slip ring (7) is fixedly installed on the support shaft (31), and a second conductive slip ring (8) is fixedly installed on the connecting shaft (43).

Images