Power line insulation detection device

Abstract

A power line insulation detection device disclosed by the present invention comprises a machine shell and an abutting wheel arranged on the machine shell and used for abutting against a cable, the machine shell is provided with a determination structure for identifying a damaged position of a cable insulation layer, and the determination structure comprises a bidirectional screw rod which rotates on the machine shell in a fixed-axis manner and freely rotates in the vertical direction. The two-way screw rod is provided with two groups of traversing seats which synchronously move towards each other or away from each other in the horizontal direction, each traversing seat is provided with a directional assembly for limiting the horizontal position of the traversing seat, and the extension plate is provided with a guide assembly for driving the abutting wheel to freely rotate in the horizontal direction after the abutting wheel abuts against the cable. According to the cable insulation layer damage detection device, the movement path of the abutting wheel can be ensured to be accurate, the detection range covers the laying direction of a cable, meanwhile, the damage position of a cable insulation layer can be accurately identified and marked, the accurate fault positioning reduces the time for maintenance personnel to find faults, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of power line detection, in particular to a power line insulation detection device. Background Art

[0002] With the development of power systems, power lines play a vital role in the power supply network, and the stability and safety of their operation directly affect the reliability of the entire power system. During the long-term operation of power lines, due to environmental conditions, mechanical stress, aging, external force damage and other factors, the insulation layer may deteriorate, be damaged or even rupture, resulting in failure or interruption of the power system. Therefore, effective detection of the insulation performance of power lines is a key link to ensure the safe operation of the power system.

[0003] Chinese patent (Announcement No.: CN118091327A), the scheme specifically includes two mobile seats, the inner sides of the two mobile seats are installed with multiple linearly arranged fault detection modules, each of the fault detection modules includes two symmetrically distributed electric telescopic rods, one end of the electric telescopic rod is fixed on the inner wall of the mobile seat, the other end of the electric telescopic rod is fixed with a C-shaped metal sheet, the two C-shaped metal sheets are symmetrical to each other, the inner sides of the two C-shaped metal sheets are fixed with multiple insulating fixed rods, one end of the insulating fixed rod is slidably plugged with a clamping rod, one end of the clamping rod is plugged into the inside of the insulating fixed rod and a clamping spring is installed between the insulating fixed rod, the two ends of the clamping spring are respectively fixed to the end of the clamping rod and the inner wall of the insulating fixed rod, and the other end of the clamping rod is inlaid with a clamping ball. The present invention can quickly locate the fault point of the circuit wire and improve the detection effect.

[0004] Existing equipment for insulation testing of power cables usually performs power tests such as high voltage test or partial discharge test on the line through power testing equipment to detect the insulation performance of the cable. However, in view of the phenomenon of insufficient insulation caused by damage to the insulation layer of the cable, when the insulation layer is partially damaged, it is difficult to locate the fault position, and it is difficult for the staff to perform temporary or permanent repair work on the fault position. Therefore, a power line insulation testing device is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a power line insulation detection device, which has the advantage of accurately locating the fault position to reduce the time for maintenance personnel to find the fault, and solves the problem that it is difficult to locate the fault position when local damage occurs to the insulation layer.

[0006] To achieve the above object, the present invention provides the following technical solution: a power line insulation detection device, comprising a housing and a holding wheel thereon for holding a cable, the housing being provided with a water tank for containing a marking liquid, and the housing being provided with a measuring structure for marking a damaged position of the cable insulation layer; The measuring structure comprises a bidirectional screw which is fixedly rotated on the housing and can rotate freely in the vertical direction, the bidirectional screw is provided with two groups of traverse seats which move synchronously towards or away from each other in the horizontal direction, the traverse seats are provided with an extension plate for supporting the abutting wheel, and the abutting wheel is fixedly rotated on the extension plate; The traverse seat is provided with a directional component for limiting its own horizontal position, and the extension plate is provided with a guide component for driving the abutting wheel to freely rotate in the horizontal direction after the abutting wheel abuts against the cable; The casing is fixedly connected with a piston cylinder, and a piston plate which can freely move in a vertical direction is arranged in the piston cylinder. The casing is provided with a temperature difference component which drives the marking liquid to enter the piston cylinder when the temperature of the cable is abnormal.

[0007] Preferably, the traverse seat has an internal threaded barrel that rotates on a fixed axis, and the internal threaded barrel is threadedly connected to the bidirectional screw rod, a receiving groove is provided in the traverse seat, and a limit plate is slidably connected in the receiving groove, and a limit groove is provided in the internal threaded barrel corresponding to the position of the limit plate; The end of the limit plate away from the internal threaded tube is fixedly connected with a bottom column, the bottom column slides through the traverse seat, and the outer circumference of the bottom column is sleeved with a return spring, and the two ends of the return spring are respectively fixedly connected to the limit plate and the traverse seat; Preferably, a plurality of groups of stop seats are fixedly connected to the casing, and the traverse seat sliding sleeve is arranged on the stop seats.

[0008] Preferably, the orientation assembly comprises a positioning plate arranged on the traverse seat, a positioning pin is fixedly connected to the limiting plate on one side of the positioning plate, a V-shaped positioning groove for sliding connection of the positioning pin is provided on the positioning plate, and the V-shaped positioning groove is fixedly connected to the extension plate; The traverse seat is provided with a rectangular groove for the positioning plate to slide horizontally.

[0009] Preferably, the guide assembly comprises a hollow end frame coaxially fixed with the internal threaded cylinder, a yielding column is provided on the hollow end frame, and a spline groove for horizontal sliding of the yielding column is opened on the hollow end frame, a plurality of sets of yielding springs are arranged in the spline groove, and two ends of the yielding springs are respectively fixedly connected to the yielding column and the hollow end frame; A hollow bevel gear is coaxially fixed on the yield column, the hollow bevel gear is meshingly connected with a driven bevel gear, the driven bevel gear and the abutting wheel are coaxially fixed, and the abutting wheel includes an integrally formed inner arc portion.

[0010] Preferably, the casing is provided with an adjusting disk which is transmission connected to the bidirectional screw and can rotate freely in the vertical direction. The outer peripheral surface of the piston plate is in sliding contact with the inner wall of the piston cylinder, and the end of the piston plate facing the adjusting disk is fixedly connected to a vertical column, the vertical column is provided with a connecting rod for fixed-axis rotation, and the end of the connecting rod away from the vertical column is fixed-axis rotated on the adjusting disk.

[0011] Preferably, the temperature difference assembly comprises an arc-shaped frame fixedly connected to the piston cylinder, the piston cylinder comprises an integrally formed extension portion on the side facing the arc-shaped frame, a stop plate freely moving in a vertical direction is provided between the extension portion and the arc-shaped frame, and the opposing surfaces of the arc-shaped frame and the extension portion are in sliding contact with the stop plate; The arc-shaped frame and the extension part are both provided with an upper hole and a lower hole which are in gas communication with the piston cylinder, the lower hole is in gas communication with the outside natural air, and the upper hole is in gas communication with the water tank; The blocking plate is provided with a group of center holes corresponding to the positions of the upper holes and the lower holes.

[0012] Preferably, the center hole corresponds to the position of the lower hole in the initial state, and a heat conducting plate that is in contact with the cable surface is provided below the blocking plate. The heat conducting plate is fixedly connected to the arc frame, and a memory alloy is fixedly connected to the heat conducting plate, and the end of the memory alloy away from the heat conducting plate is fixedly connected to the blocking plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a measuring structure and drives the synchronous movement of the traverse seat through a bidirectional screw rod. The measuring structure can ensure the accuracy of the movement path of the holding wheel, so that the detection range covers the laying direction of the cable, avoiding missed detection and false detection, and can accurately identify and mark the damaged position of the cable insulation layer. This precise fault location reduces the time for maintenance personnel to find the fault and improves maintenance efficiency.

[0014] 2. The present invention provides a temperature difference component, which can automatically spray marking liquid to the fault location when the cable is locally overheated, thereby realizing real-time detection and marking. This automated function reduces the error of manual detection, improves the reliability of detection, and avoids the need to replace the entire cable by accurately identifying local damage. This local repair method greatly reduces maintenance costs, especially when the cost of replacing the entire cable is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the components where the holding wheel of the present invention is located; Figure 3 This is a schematic diagram of the components where the traverse seat of the present invention is located; Figure 4 This is a schematic diagram of the components where the internal threaded barrel of the present invention is located; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 It is a schematic diagram of the components where the hollow end frame of the present invention is located; Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle; Figure 8 It is a schematic diagram of the components where the arc frame of the present invention is located; Fig. 9 This is a schematic diagram of the component where the memory alloy of the present invention is located; Fig.10 For the present invention Fig. 9 Enlarged view of center C.

[0016] In the figure: 1, casing; 2, two-way screw rod; 3, internal threaded cylinder; 4, traverse seat; 5, resisting seat; 6, limit plate; 7, limit groove; 8, bottom column; 9, reset spring; 10, accommodating groove; 11, positioning plate; 12, positioning pin; 13, V-shaped positioning groove; 14, extension plate; 15, resisting wheel; 16, inner arc portion; 17, hollow end frame; 18, give way column; 19, give way spring; 20, hollow bevel gear; 21, driven bevel gear; 22, adjustment plate; 23, connecting rod; 24, vertical column; 25, piston plate; 26, piston cylinder; 261, extension portion; 27, arc frame; 28, upper hole; 29, lower hole; 30, resisting plate; 31, center hole; 32, memory alloy; 33, heat conduction plate. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figures 1 to 10 The present invention provides a technical solution: a power line insulation detection device, comprising a housing 1 and a holding wheel 15 thereon for holding a cable, the housing 1 is provided with a water tank for containing a marking liquid, and the housing 1 is provided with a measuring structure for marking a damaged position of the cable insulation layer; The measuring structure comprises a bidirectional screw 2 which is fixedly rotated on a housing 1 and can rotate freely in a vertical direction, and the bidirectional screw 2 is provided with two groups of traverse seats 4 which move synchronously in opposite directions in a horizontal direction, and the traverse seats 4 are provided with an extension plate 14 for supporting a supporting wheel 15, and the supporting wheel 15 is fixedly rotated on the extension plate 14; The traverse seat 4 is provided with a directional component for limiting its own horizontal position, and the extension plate 14 is provided with a guide component for driving the abutting wheel 15 to freely rotate in the horizontal direction after the abutting wheel 15 abuts against the cable; The housing 1 is fixedly connected with a piston cylinder 26, and a piston plate 25 is provided in the piston cylinder 26 so as to move freely in the vertical direction. The housing 1 is provided with a temperature difference component for driving the marking liquid into the piston cylinder 26 when the temperature of the cable is abnormal.

[0019] like Figure 1 and Figure 2 As shown, when the insulation performance of the power line is tested, the motor arranged on the housing 1 drives the bidirectional screw rod 2 to rotate freely in the vertical direction, thereby driving the two groups of traverse seats 4 arranged thereon to move synchronously toward each other in the horizontal direction, wherein the abutting wheel 15 rotates on an extension plate 14 fixedly connected to the traverse seat 4, therefore, the horizontal movement process of the two groups of traverse seats 4 can drive the abutting wheel 15 to gradually move toward the cable direction, and finally abut against the outer peripheral surface of the cable.

[0020] At the same time, when the two groups of abutment wheels 15 are respectively abutted on both sides of the cable, under the tendency of the directional assembly, the horizontal position of the traverse seat 4 will no longer change, so that the two groups of abutment wheels 15 can stably maintain a close contact with the cable. At the same time, driven by the guide assembly, the two groups of abutment wheels 15 rotate synchronously in the horizontal direction, and the rotation directions are opposite, wherein the outer peripheral surface of the abutment wheel 15 is in friction contact with the cable. Therefore, in actual use, a pulley can be added to the casing 1 so that when the two groups of abutment wheels 15 rotate, the abutment wheels 15 drive the casing 1 and its components to move along the laying direction of the cable.

[0021] Among them, when the casing 1 moves along the cable laying direction, under the action of the temperature difference component arranged thereon, when the cable overheats due to insulation failure at a certain point, the marking liquid placed in the water tank can be driven into the piston cylinder 26. At the same time, the piston plate 25 reciprocating in the piston cylinder 26 forms a piston movement, and sprays the marking liquid entering the piston cylinder 26 toward the cable position. Among them, the marking liquid can be a fluorescent liquid or a liquid with a bright color, so that it is convenient for the staff to locate and find the fault position later.

[0022] It should be noted that when the insulation layer of the cable is damaged and affects the insulation performance, there is a way to repair the damaged part without replacing the entire cable. This repair method is usually used for local damage, especially when replacing the entire cable is costly or impractical. Therefore, when the insulation performance is affected by partial damage to the cable insulation layer, the damaged position will cause overheating due to factors such as local current concentration or arc discharge, and then the fault location is identified through the temperature difference component, and the adjacent insulation layer of the cable fault location is marked to facilitate the subsequent search and repair process by the staff.

[0023] In one of the more preferred embodiments, the traverse seat 4 is provided with an internal threaded barrel 3 which is fixedly rotated on the axis, and the internal threaded barrel 3 is threadedly connected to the bidirectional screw rod 2, a receiving groove 10 is provided in the traverse seat 4, and a limit plate 6 is slidably connected in the receiving groove 10, and a limit groove 7 is provided in the position of the internal threaded barrel 3 corresponding to the limit plate 6; The end of the limit plate 6 away from the internal threaded tube 3 is fixedly connected to a bottom column 8, the bottom column 8 slides through the traverse seat 4, and the outer circumference of the bottom column 8 is sleeved with a return spring 9, the two ends of the return spring 9 are respectively fixedly connected to the limit plate 6 and the traverse seat 4.

[0024] The housing 1 is fixedly connected with a plurality of groups of stop seats 5 , and the traverse seat 4 is slidably sleeved on the stop seats 5 .

[0025] like Figure 1-Figure 5 As shown, when the limit plate 6 is in the limit groove 7, the two are in a combined state. At this time, when the bidirectional screw 2 rotates in the vertical direction, since the traverse seat 4 is slidably sleeved on the stop seat 5, the traverse seat 4 cannot rotate with the bidirectional screw 2 under the restriction of the stop seat 5, and then the rotation process of the bidirectional screw 2 will drive the traverse seat 4 to move in the horizontal direction through the internal threaded tube 3.

[0026] Among them, an extension plate 14 for supporting the abutting wheel 15 is provided on the traverse seat 4, so that the abutting wheel 15 can be driven to move toward the cable direction and abut against the cable, and after the abutting wheel 15 is in close contact with the cable, under the drive of the directional component, the limit plate 6 will disengage from the limit groove 7. At this time, when the bidirectional screw rod 2 continues to rotate, since the internal threaded tube 3 and the traverse seat 4 are in a separated state, the internal threaded tube 3 is not restricted by the traverse seat 4. Therefore, the internal threaded tube 3 can rotate synchronously with the bidirectional screw rod 2, and the position of the traverse seat 4 will no longer change.

[0027] Among them, the position of the supporting wheel 15 and the cable will no longer change with the rotation of the bidirectional screw rod 2. Therefore, in actual use, it can adapt to cables of different diameters and can support cables of different sizes, thereby eliminating the need for manual adjustment of the device, thereby improving the versatility and practicality of the device.

[0028] Furthermore, the orientation assembly includes a positioning plate 11 disposed on the traverse seat 4, a positioning pin 12 is fixedly connected to the limiting plate 6 facing the side of the positioning plate 11, a V-shaped positioning groove 13 for the positioning pin 12 to be slidably connected is provided on the positioning plate 11, and the V-shaped positioning groove 13 is fixedly connected to the extension plate 14; The traverse seat 4 is provided with a rectangular groove for the positioning plate 11 to slide horizontally.

[0029] like Figure 4 and Figure 5 As shown, when the traverse seat 4 moves in the horizontal direction, the abutting wheel 15 arranged thereon contacts the surface of the cable and cannot continue to move horizontally. At this time, as the bidirectional screw rod 2 continues to rotate, the traverse seat 4 can continue to move horizontally for a certain distance. Therefore, the positioning plate 11 is relatively positioned between the traverse seat 4 and the abutting wheel 15, thereby driving the positioning pin 12 to slide on the V-shaped positioning groove 13.

[0030] Among them, the positioning pin 12 is fixedly set on the limit plate 6, and a return spring 9 is provided between the limit plate 6 and the traverse seat 4. Therefore, when the positioning pin 12 slides on the V-shaped positioning groove 13, it drives the limit plate 6 to move in the vertical direction and drives the limit plate 6 to disengage from the limit groove 7. Then, when the bidirectional screw rod 2 rotates subsequently, the internal threaded tube 3 will no longer be restricted by the limit plate 6 in the traverse seat 4. Therefore, the internal threaded tube 3 subsequently rotates synchronously with the traverse seat 4 and drives the guide assembly to operate.

[0031] Based on the embodiment of the directional assembly, the guide assembly includes a hollow end frame 17 coaxially fixed with the internal threaded tube 3, a yielding column 18 is provided on the hollow end frame 17, and a spline groove for horizontal sliding of the yielding column 18 is opened on the hollow end frame 17, and a plurality of groups of yielding springs 19 are provided in the spline groove, and the two ends of the yielding spring 19 are respectively fixedly connected to the yielding column 18 and the hollow end frame 17; A hollow bevel gear 20 is coaxially fixed on the yielding column 18 , and a driven bevel gear 21 is meshingly connected with the hollow bevel gear 20 . The driven bevel gear 21 is coaxially fixed to the abutting wheel 15 , and the abutting wheel 15 includes an integrally formed inner arc portion 16 .

[0032] like Figure 4 , Figure 6 and Figure 7 As shown, when the limit plate 6 disengages from the limit groove 7, the internal threaded tube 3 rotates in the vertical direction following the bidirectional screw 2, thereby driving the hollow end frame 17 and the give-way column 18 provided on the internal threaded tube 3 to rotate in the vertical direction, wherein a hollow bevel gear 20 is coaxially provided on the give-way column 18, and the hollow bevel gear 20 is meshingly connected with the driven bevel gear 21. Therefore, the rotation process of the give-way column 18 can drive the supporting wheel 15 coaxially fixed with the driven bevel gear 21 to rotate in the horizontal direction.

[0033] It should be noted that in the process of the limit plate 6 disengaging from the limit groove 7, the traverse seat 4 will have relative movement with the positioning plate 11 in the horizontal direction, wherein the horizontal relative position between the internal threaded tube 3 and the traverse seat 4 remains unchanged, and the abutting wheel 15 is arranged on the positioning plate 11 through the extension plate 14, so there is relative displacement between the abutting wheel 15 and the traverse seat 4. Therefore, by arranging a yield spring 19 between the hollow end frame 17 and the yield column 18, when the two are relatively displaced, the spline groove arrangement and the compression deformation of the yield spring 19 can provide movement space for the relative displacement, and can ensure that the hollow bevel gear 20 and the driven bevel gear 21 are still in a meshing state, and ensure that the hollow bevel gear 20 can rotate synchronously with the internal threaded tube 3, so that when the bidirectional screw 2 continues to rotate, the abutting wheel 15 is driven to resist the cable and then rotate horizontally.

[0034] Based on the guide assembly embodiment, the casing 1 is provided with an adjustment disk 22 which is transmission-connected to the bidirectional screw 2 and can rotate freely in the vertical direction. The outer peripheral surface of the piston plate 25 is in sliding contact with the inner wall of the piston cylinder 26, and the piston plate 25 is fixedly connected to a vertical column 24 at one end facing the adjustment disk 22. The vertical column 24 is provided with a connecting rod 23 which rotates on a fixed axis. The end of the connecting rod 23 which is away from the vertical column 24 rotates on a fixed axis on the adjustment disk 22.

[0035] like Figure 1 and Figure 8 As shown, when the motor drives the bidirectional lead screw 2 to rotate in the vertical direction, it can synchronously drive the adjusting disk 22 that is transmission-connected to the bidirectional lead screw 2 to rotate in the vertical direction, wherein the adjusting disk 22 can synchronously change the horizontal height of one end of the connecting rod 23 during rotation, and drive the connecting rod 23 to swing. Therefore, the displacement of the connecting rod 23 in the vertical direction needs to be compensated by the movement of the vertical column 24 and the piston plate 25, that is, a crank swing mechanism is formed among the adjusting disk 22, the connecting rod 23 and the vertical column 24. Therefore, when the adjusting disk 22 rotates, it can drive the piston plate 25 to perform reciprocating lifting and lowering motion in the piston cylinder 26.

[0036] Furthermore, the temperature difference assembly includes an arc frame 27 fixedly connected to the piston cylinder 26, and the piston cylinder 26 includes an integrally formed extension portion 261 on the side facing the arc frame 27, and a blocking plate 30 that can move freely in the vertical direction is provided between the extension portion 261 and the arc frame 27, and the opposing surfaces of the arc frame 27 and the extension portion 261 are in sliding contact with the blocking plate 30; The arc-shaped frame 27 and the extension 261 are both provided with an upper hole 28 and a lower hole 29 which are in gas communication with the piston cylinder 26. The lower hole 29 is in gas communication with the outside natural air, and the upper hole 28 is in gas communication with the water tank. The blocking plate 30 is provided with a group of center holes 31 corresponding to the positions of the upper holes 28 and the lower holes 29 .

[0037] In the initial state, the center hole 31 corresponds to the position of the lower hole 29. A heat conducting plate 33 that is in contact with the cable surface is provided below the blocking plate 30. The heat conducting plate 33 is fixedly connected to the arc frame 27. A memory alloy 32 is fixedly connected to the heat conducting plate 33, and one end of the memory alloy 32 away from the heat conducting plate 33 is fixedly connected to the blocking plate 30.

[0038] like Figure 1 , Figure 8 and Fig. 9 As shown, an outlet pipe is fixedly passed through the piston cylinder 26, and two groups of inlet positions, an upper hole 28 and a lower hole 29, are provided at the extension portion 261, wherein the lower hole 29 is in gas communication with the outside natural air, and the upper hole 28 is in gas communication with the water tank. In the initial state, as the piston plate 25 reciprocates in the piston cylinder 26, the outside gas enters the piston cylinder 26 through the lower hole 29, and blows the cable position through the piston cylinder 26 and the outlet channel, wherein a group of one-way valves with opposite valve ports are respectively provided at the lower hole 29 and the outlet channel position, thereby limiting the flow direction of the gas.

[0039] At the same time, by blowing air to the cable, dust, dirt and debris on the cable surface can be effectively removed, which may affect the accuracy of temperature measurement. Keeping the cable surface clean helps to ensure good contact and normal operation of the heat conducting plate 33.

[0040] Among them, when the temperature at the cable fault position rises abnormally, its temperature is transferred to the memory alloy 32 through the heat conduction plate 33, and after the temperature reaches the set value, the memory alloy 32 can stretch and deform, thereby driving the blocking plate 30 to move upward, so that the center hole 31 corresponds to the position of the upper hole 28, and the blocking plate 30 can block the lower hole 29.

[0041] When the piston plate 25 subsequently reciprocates in the piston cylinder 26, it can draw the marking liquid in the water tank through the upper hole 28, and discharge the marking liquid to the cable through the outlet pipe. The upper hole 28 is also provided with a one-way valve opposite to the valve port of the outlet pipe, thereby ensuring that the flow direction of the marking liquid can only enter from the water tank into the piston cylinder 26, and be sprayed to the cable through the piston cylinder 26.

[0042] It should be noted that, in actual use, the heat conducting plate 33 is in sliding contact with the surface of the cable. When the casing 1 drives the components thereon to move along the cable laying direction, some heat is generated due to the friction between the heat conducting plate 33 and the cable surface. However, when the blocking plate 30 is in the initial state, the external natural gas is connected to the piston cylinder 26 through the lower hole 29, and under the movement of the piston plate 25, the piston cylinder 26 reciprocates to draw gas and discharge the gas to the cable surface, so that the flow of gas can achieve a certain cooling effect on the heat conducting plate 33, and the frictional heat generated by the heat conducting plate 33 during the movement will not drive the memory alloy 32 to deform. Therefore, it will not cause the problem of accidental spraying of the marking liquid, thereby ensuring the accuracy of the detection.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power line insulation detection device, comprising a housing (1) and a holding wheel (15) thereon for holding a cable, wherein a water tank for containing a marking liquid is provided on the housing (1), characterized in that: The housing (1) is provided with a measuring structure for marking the location where the insulation layer of the cable is damaged; The measuring structure comprises a bidirectional screw (2) which is fixedly rotated on the housing (1) and can rotate freely in the vertical direction, the bidirectional screw (2) is provided with two groups of traverse seats (4) which move synchronously towards or away from each other in the horizontal direction, the traverse seats (4) are provided with an extension plate (14) for supporting a supporting wheel (15), and the supporting wheel (15) is fixedly rotated on the extension plate (14); The traverse seat (4) is provided with a directional assembly for limiting its own horizontal position, and the extension plate (14) is provided with a guide assembly for driving the abutting wheel (15) to freely rotate in the horizontal direction after the abutting wheel (15) abuts against the cable; The casing (1) is fixedly connected to a piston cylinder (26), and a piston plate (25) is provided in the piston cylinder (26) so as to move freely in a vertical direction. The casing (1) is provided with a temperature difference component for driving a marking liquid to enter the piston cylinder (26) when the temperature of the cable is abnormal.

2. A power line insulation detection device according to claim 1, characterized in that: An internal threaded barrel (3) is fixedly rotatable on the traverse seat (4), and the internal threaded barrel (3) is threadedly connected to the bidirectional screw rod (2); a receiving groove (10) is provided in the traverse seat (4), and a limit plate (6) is slidably connected in the receiving groove (10); and a limit groove (7) is provided in the internal threaded barrel (3) at a position corresponding to the limit plate (6); The end of the limit plate (6) away from the internal threaded tube (3) is fixedly connected to a bottom column (8), the bottom column (8) slidably penetrates the traverse seat (4), and a return spring (9) is sleeved on the outer circumference of the bottom column (8), and the two ends of the return spring (9) are respectively fixedly connected to the limit plate (6) and the traverse seat (4).

3. A power line insulation detection device according to claim 2, characterized in that: The casing (1) is fixedly connected to a plurality of groups of stop seats (5), and the traverse seat (4) is slidably sleeved on the stop seats (5).

4. A power line insulation detection device according to claim 3, characterized in that: The orientation assembly comprises a positioning plate (11) arranged on the traverse seat (4); a positioning pin (12) is fixedly connected to the side of the limit plate (6) facing the positioning plate (11); a V-shaped positioning groove (13) for sliding connection of the positioning pin (12) is formed on the positioning plate (11); and the V-shaped positioning groove (13) is fixedly connected to the extension plate (14); The traverse seat (4) is provided with a rectangular groove for the positioning plate (11) to slide horizontally.

5. A power line insulation detection device according to claim 4, characterized in that: The guide assembly comprises a hollow end frame (17) coaxially fixed to the internal threaded cylinder (3), a yielding column (18) being provided on the hollow end frame (17), and a spline groove for horizontal sliding of the yielding column (18) being provided on the hollow end frame (17), a plurality of groups of yielding springs (19) being provided in the spline groove, and two ends of the yielding springs (19) being fixedly connected to the yielding column (18) and the hollow end frame (17) respectively; A hollow bevel gear (20) is coaxially fixed on the yield column (18), the hollow bevel gear (20) is meshingly connected with a driven bevel gear (21), the driven bevel gear (21) and the abutting wheel (15) are coaxially fixed, and the abutting wheel (15) includes an integrally formed inner arc portion (16).

6. A power line insulation detection device according to claim 5, characterized in that: The casing (1) is provided with an adjustment disk (22) which is transmission-connected to the bidirectional screw (2) and can rotate freely in the vertical direction. The outer peripheral surface of the piston plate (25) is in sliding contact with the inner wall of the piston cylinder (26). One end of the piston plate (25) facing the adjustment disk (22) is fixedly connected to a vertical column (24). The vertical column (24) is provided with a connecting rod (23) which rotates on a fixed axis. One end of the connecting rod (23) which is away from the vertical column (24) rotates on a fixed axis on the adjustment disk (22).

7. A power line insulation detection device according to claim 6, characterized in that: The temperature difference assembly comprises an arc-shaped frame (27) fixedly connected to the piston cylinder (26); the piston cylinder (26) comprises an integrally formed extension portion (261) on the side facing the arc-shaped frame (27); a stop plate (30) that is freely movable in a vertical direction is provided between the extension portion (261) and the arc-shaped frame (27); and opposing surfaces of the arc-shaped frame (27) and the extension portion (261) are in sliding contact with the stop plate (30); The arc-shaped frame (27) and the extending portion (261) are both provided with an upper hole (28) and a lower hole (29) which are in gas communication with the piston cylinder (26); the lower hole (29) is in gas communication with the outside natural air, and the upper hole (28) is in gas communication with the water tank; The blocking plate (30) is provided with a group of center holes (31) at positions corresponding to the upper holes (28) and the lower holes (29).

8. A power line insulation detection device according to claim 7, characterized in that: In the initial state, the center hole (31) corresponds to the position of the lower hole (29); a heat conducting plate (33) is provided below the blocking plate (30) and is in contact with the surface of the cable; the heat conducting plate (33) is fixedly connected to the arc-shaped frame (27); a memory alloy (32) is fixedly connected to the heat conducting plate (33); and an end of the memory alloy (32) away from the heat conducting plate (33) is fixedly connected to the blocking plate (30).

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