A kind of power distribution equipment insulation resistance detection device

Abstract

This invention discloses an insulation resistance testing device for power distribution equipment, relating to the field of insulation resistance testing technology. It includes a megohmmeter and a cleaning assembly. A cable is connected to one side of the megohmmeter, and a protective sleeve is provided at one end of the cable. An upper clamp is adhered to the upper inner side of the protective sleeve, and a lower clamp is adhered to the lower inner side of the protective sleeve. A rotating shaft is fixed in the middle of the upper clamp. This invention integrates the necessary contact surface cleaning steps into the indispensable clamping action itself. The operator only needs to open and close the upper and lower clamps as if using ordinary clamps. The device will automatically allow the brush plate to contact and brush the surface of the workpiece under test first, then automatically separate to allow for placement, and finally, the conductive clamps complete the electrical connection. This single opening and closing is equivalent to two steps: manual cleaning and precise clamping, completely eliminating the tedious process of preparing additional tools and finding the right angle for manual wiping, greatly improving the smoothness and efficiency of operation.

Description

Technical Field

[0001] This invention relates to the field of insulation resistance testing technology, specifically to an insulation resistance testing device for power distribution equipment. Background Technology

[0002] An insulation resistance testing device for power distribution equipment is a specialized instrument used to measure the insulation performance of electrical equipment in a power distribution system. Such as a megohmmeter, its core function is to generate a DC high voltage to detect the leakage current between the conductor and the ground or between phases of the insulation medium, thereby calculating the insulation resistance value and assessing whether the equipment has insulation defects such as moisture, aging, dirt or breakdown, so as to ensure the safe and stable operation of the power distribution system.

[0003] For example, patent CN206975117U discloses an insulation resistance testing device. This patent can test the insulation resistance of multiple components at once, is simple to operate, has high testing efficiency, and can effectively avoid missed or repeated testing, improving the reliability of the test results and thus enhancing the quality and safety of electrical products. However, when this type of test clamp is used to clamp exposed terminals or wire ends on power distribution equipment, it is not convenient to automatically clean the clamping part of the terminals. Impurities left behind will directly lead to poor contact between the test clamp and the tested part, increasing the contact resistance, which in turn causes distortion of the insulation resistance test value, seriously affecting the detection accuracy and the reliability of the test results. Summary of the Invention

[0004] The purpose of this invention is to provide an insulation resistance detection device for power distribution equipment to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an insulation resistance testing device for power distribution equipment, comprising a megohmmeter and a cleaning assembly. A cable is connected to one side of the megohmmeter, and a protective sleeve is provided at one end of the cable. An upper clamp is adhered to the upper inner side of the protective sleeve, and a lower clamp is adhered to the lower inner side of the protective sleeve. A rotating shaft is fixed in the middle of the upper clamp, and a torsion spring is sleeved on the outer side of the rotating shaft. A conductive clamp is fixed to one end of the upper and lower clamps. The cleaning assembly is disposed at one end of the upper and lower clamps, and includes a guide groove. A guide groove is formed at one end of the upper and lower clamps, and a guide post is slidably connected inside the guide groove. A hanging plate is fixed in the middle of the guide post, and a brush plate is placed at one end of the hanging plate. A vertical rod is fixed in the middle of one side of the brush plate, and a slider is slidably connected to the outer side of the middle of the vertical rod. A return spring abuts against one side of the slider, and a tension spring is fixed between the two sliders.

[0006] Furthermore, the guide groove is composed of vertical grooves and inclined grooves connected together, and the width of the guide groove matches the diameter of the guide post.

[0007] Furthermore, the sliders located at the upper and lower positions are slidably connected to the upper clamp and the lower clamp, respectively, and the lower clamp is rotatably connected to the rotating shaft.

[0008] Furthermore, the conductive clamp is electrically connected to the cable via a wire, and the length of the conductive clamp is less than the length of the brush plate.

[0009] Furthermore, a dust removal assembly is provided between the upper clamp and the lower clamp, and the dust removal assembly includes an air suction hole. An air suction hole is provided on one side of the brush plate, and a cover plate is connected to one end of the brush plate. A buckle is fixed on one side of the cover plate, and a locking strip is abutted at one end of the buckle. A connecting frame is fixed in the middle of the cover plate, and a filter bag is placed at one end of the connecting frame. A hose is connected to one end of the brush plate through a one-way valve. A telescopic airbag is fixed between the upper clamp and the lower clamp, and an exhaust pipe is connected to the lower part of the telescopic airbag through a one-way valve.

[0010] Furthermore, the brush plate has a hollow center and is slidably connected to the connecting frame.

[0011] Furthermore, the telescopic airbag is connected to the hose, and the hoses located at the upper and lower positions are fixedly connected to the upper clamp and the lower clamp, respectively.

[0012] Furthermore, an anti-detachment component is connected to one side of the upper clamp, and the anti-detachment component includes a connecting shaft. The connecting shaft is installed on one side of the upper clamp, and a rotating plate is rotatably connected to the outer side of the connecting shaft. A pressure plate is fixed on the upper part of the rotating plate, and a protruding post is installed at the lower end of one side of the rotating plate. One end of the protruding post abuts against a drive ring, and a movable gear plate is fixed inside the drive ring. A fixed gear plate is fitted on one side of the movable gear plate, and a synchronous shaft is slidably connected inside the movable gear plate. A positioning spring abuts against the other side of the movable gear plate.

[0013] Furthermore, the fixed gear plate is fixedly connected to the lower clamp, and the axis of the fixed gear plate coincides with the axis of the rotating shaft.

[0014] Furthermore, the central part of the synchronous shaft is prismatic, and the synchronous shaft is fixedly connected to the rotating shaft.

[0015] This invention provides an insulation resistance testing device for power distribution equipment, which has the following advantages: 1. This invention integrates the necessary contact surface cleaning steps into the indispensable clamping action itself. The operator only needs to open and close the upper and lower clamps as if using ordinary clamps. The device will automatically allow the brush plate to contact and brush the surface of the workpiece to be tested first, and then automatically separate to make way. Finally, the conductive clamping block completes the electrical connection. This one-time opening and closing is equivalent to two steps of manual cleaning and precise clamping, completely eliminating the tedious process of preparing additional tools and finding the angle for manual wiping. It greatly improves the smoothness and efficiency of operation, and is especially suitable for scenarios that require high-frequency and fast operation, such as power distribution equipment testing.

[0016] 2. This invention intelligently couples the dust collection function generated during the cleaning process with the clamping action. During the clamping process, the closing of the upper and lower clamps pulls the telescopic airbag to generate negative pressure. This negative pressure is transmitted to the suction hole of the brush plate through the hose, which achieves the effect of brushing and suction at the same time. It can suck up the dust the moment it is generated, which greatly reduces the dust from escaping into the surrounding air during cleaning and keeps the working area clean. In addition, when cleaning the internal filter bag, a snap-on quick-release design is adopted, which does not require additional tools and significantly reduces the difficulty and time cost of maintenance.

[0017] 3. This invention utilizes the unique tooth profiles of the movable and fixed toothed discs. During normal clamping, the inclined surfaces of the meshing teeth allow for unidirectional rotation even when the positioning spring is compressed. This allows for fine-tuning of the clamping force with slight application of force after clamping, ensuring good contact. When the clamped workpiece is subjected to unexpected external forces, such as the pull of a wire causing it to loosen, the movable toothed disc tends to rotate in the opposite direction. At this time, the vertical surfaces of the teeth interlock, and since there are no inclined surfaces for slippage, the rotation is completely locked, effectively preventing accidental loosening due to vibration or pulling. This greatly improves the reliability and safety of clamping. Furthermore, this design seamlessly integrates the release of the locked state with hand-held actions. The operator only needs to pinch the flexible protective sleeve like using a regular clamp to separate the movable toothed disc from the fixed toothed disc via the linkage. This achieves instant release by pinching, eliminating the need to find and manipulate the independent locking buckles on traditional clamps. The operation is intuitive and fast, making it particularly suitable for scenarios requiring frequent opening and closing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall front view structure of the insulation resistance detection device for power distribution equipment according to the present invention; Figure 2 This is a three-dimensional structural diagram of the protective sleeve of the insulation resistance detection device for power distribution equipment according to the present invention; Figure 3 This is a schematic diagram of the telescopic airbag structure of an insulation resistance detection device for power distribution equipment according to the present invention; Figure 4 This is a schematic diagram of the torsion spring structure of an insulation resistance detection device for power distribution equipment according to the present invention; Figure 5 This is a schematic diagram of the cleaning component of an insulation resistance testing device for power distribution equipment according to the present invention; Figure 6 This is a bottom view of the brush plate structure of the insulation resistance detection device for power distribution equipment according to the present invention. Figure 7 This is a schematic diagram of the brush plate folding structure of an insulation resistance testing device for power distribution equipment according to the present invention; Figure 8 This is a schematic diagram of the explosion-proof component of the insulation resistance detection device for power distribution equipment according to the present invention.

[0019] In the diagram: 1. Megohmmeter; 2. Cable; 3. Sheath; 4. Upper clamp; 5. Lower clamp; 6. Shaft; 7. Torsion spring; 8. Conductive clamp; 9. Cleaning assembly; 901. Guide groove; 902. Guide post; 903. Hanging plate; 904. Brush plate; 905. Vertical rod; 906. Slider; 907. Return spring; 908. Tension spring; 10. Dust removal assembly; 1001. Suction port; 1002. Cover plate; 10 03. Buckle; 1004. Clip; 1005. Connecting frame; 1006. Filter bag; 1007. Hoses; 1008. Telescopic airbag; 1009. Exhaust pipe; 11. Anti-detachment component; 1101. Coupling; 1102. Rotating plate; 1103. Pressure plate; 1104. Protruding post; 1105. Drive ring; 1106. Movable gear plate; 1107. Fixed gear plate; 1108. Synchronous shaft; 1109. Positioning spring. Detailed Implementation

[0020] Please see Figures 1 to 7The present invention provides a technical solution: an insulation resistance testing device for power distribution equipment, comprising a megohmmeter 1 and a cleaning component 9. A cable 2 is connected to one side of the megohmmeter 1, and a protective sleeve 3 is provided at one end of the cable 2. An upper clamp 4 is bonded to the upper inner side of the protective sleeve 3, and a lower clamp 5 is bonded to the lower inner side of the protective sleeve 3. A rotating shaft 6 is fixed in the middle of the upper clamp 4, and a torsion spring 7 is sleeved on the outer side of the rotating shaft 6. A conductive clamp 8 is fixed to one end of the upper clamp 4 and the lower clamp 5. The cleaning component 9 is disposed at one end of the upper clamp 4 and the lower clamp 5, and the cleaning component 9 includes a guide groove 901. A guide groove 901 is formed at one end of the upper clamp 4 and the lower clamp 5, and a guide post 902 is slidably connected inside the guide groove 901. 01 is composed of vertical grooves and inclined grooves connected together, and the width of the guide groove 901 matches the diameter of the guide post 902. A hanging plate 903 is fixed in the middle of the guide post 902, and a brush plate 904 is installed at one end of the hanging plate 903. The conductive clamp 8 is electrically connected to the cable 2 through a wire, and the length of the conductive clamp 8 is less than the length of the brush plate 904. A vertical rod 905 is fixed in the middle of one side of the brush plate 904, and a slider 906 is slidably connected to the outer side of the middle of the vertical rod 905. The sliders 906 located at the upper and lower positions are slidably connected to the upper clamp 4 and the lower clamp 5 respectively, and the lower clamp 5 is rotatably connected to the rotating shaft 6. A return spring 907 is abutted on one side of the slider 906, and a tension spring 908 is fixed between the two sliders 906. The specific operation is as follows: During the clamping operation, when the clamping ends of the upper clamp 4 and the lower clamp 5 are separated, since there is no obstruction on the brush bristle side of the brush plate 904, the return spring 907 will push the brush plate 904 away from the slider 906. During this process, the hanging plate 903 will drive the guide post 902 to slide along the vertical groove of the guide groove 901 towards the inclined groove section. Subsequently, when the brush plate 904 is misaligned with the conductive clamp 8, under the action of the tension spring 908 with greater elasticity, Pulling the adjacent slider 906 to move it centrally drives the guide post 902 to slide within the inclined groove of the guide groove 901 until the two brush plates 904 are in contact. Therefore, when clamping the terminal block or wire end, the brush surface of the brush plate 904 will contact the test piece before the conductive clamp 8. After releasing, the torsion spring 7 will apply a pushing force to one end of the upper clamp 4 and the lower clamp 5, causing them to rotate around the rotating shaft 6. The brush plate 904 will clamp the test piece first, due to the spring force of the torsion spring 7. The force is greater than the elastic force of the tension spring 908. Therefore, guided by the inclined groove section of the guide post 902 and the guide groove 901, the brush plate 904 will be driven to separate to both sides, making room for the final clamping of the conductive clamp 8. At the same time, it can also brush and clean the clamping part, effectively removing most of the non-fastening surface contaminants, allowing the conductive clamp 8 to directly contact a cleaner metal substrate. This significantly reduces the contact resistance and its fluctuation, providing a stable and low-resistance electrical signal path for subsequent testing, greatly improving the accuracy and repeatability of resistance, voltage and other parameter measurements, and reducing misjudgments caused by poor contact. Subsequently, when the brush plate 904 moves to both sides of the conductive clamp 8, the brush plate 904 will compress the return spring 907, and the conductive clamp 8 can then contact the cleaned clamping part. Thus, during operation, the clamping part can be automatically brushed and cleaned without adding any additional operating steps, improving the convenience of use and the accuracy of testing.

[0021] Please see Figures 3 to 6 A dust removal assembly 10 is provided between the upper clamp 4 and the lower clamp 5. The dust removal assembly 10 includes an air suction hole 1001. An air suction hole 1001 is provided on one side of the brush plate 904, and a cover plate 1002 is connected to one end of the brush plate 904. A buckle 1003 is fixed on one side of the cover plate 1002, and a retaining strip 1004 abuts against one end of the buckle 1003. A connecting frame 1005 is fixed in the middle of the cover plate 1002, and a filter bag 1006 is placed on one end of the connecting frame 1005. The brush plate 904 is hollow in the middle and is slidably connected to the connecting frame 1005. One end of the brush plate 904 is connected to a hose 1007 through a one-way valve. A telescopic airbag 1008 is fixed between the upper clamp 4 and the lower clamp 5. The lower part of the telescopic airbag 1008 is connected to an exhaust pipe 1009 through a one-way valve. The telescopic airbag 1008 is connected to the hose 1007. The hoses 1007 located at the upper and lower positions are fixedly connected to the upper clamp 4 and the lower clamp 5 respectively. The specific operation is as follows: During the opening of the clamping ends of the upper clamp 4 and lower clamp 5, the other ends of the upper clamp 4 and lower clamp 5 will squeeze the telescopic airbag 1008, causing the air inside to be discharged from the exhaust pipe 1009 to the outside of the protective sleeve 3 through the one-way valve. Subsequently, during the clamping process, when the brush plate 904 slides on the surface of the workpiece to be tested, the upper clamp 4 and lower clamp 5 will also pull the telescopic airbag 1008, creating a negative pressure inside. This will draw air from inside the brush plate 904 through the hose 1007 and the one-way valve, and adsorb the cleaned dust through the suction hole 1001 to reduce dust dispersion. Finally, the dust is filtered and collected by the filter bag 1006, making it more environmentally friendly. Furthermore, the filter bag 1006 can be removed... During cleaning, simply press the buckle 1003 to cause it to elastically deform and separate from the clip 1004, and the connecting bracket 1005 can be removed from inside the brush plate 904. This quick-release design requires no tools and can be completed in seconds, significantly reducing maintenance difficulty and time costs. Furthermore, the power of the entire dust removal system comes entirely from the mechanical movement generated when manually operating the clamps, eliminating the need for additional electric vacuum cleaners, air pumps, or compressed air sources. It also saves on corresponding wires, pipes, and controls. The structure is simple, the cost is low, and there is no risk of electrical failure or air supply interruption. It is highly reliable and very suitable for integration into handheld or portable testing tools, improving the self-sufficiency and applicability of the equipment.

[0022] Please see Figure 3 , Figure 4 and Figure 8 An anti-detachment component 11 is connected to one side of the upper clamp 4, and the anti-detachment component 11 includes a connecting shaft 1101. The connecting shaft 1101 is installed on one side of the upper clamp 4, and a rotating plate 1102 is rotatably connected to the outer side of the connecting shaft 1101. A pressure plate 1103 is fixed on the upper part of the rotating plate 1102, and a protrusion 1104 is installed at the lower end of one side of the rotating plate 1102. One end of the protrusion 1104 abuts against a drive ring 1105, and a movable part is fixed inside the drive ring 1105. The movable gear disk 1106 has a fixed gear disk 1107 fitted on one side, and a synchronous shaft 1108 is slidably connected inside the movable gear disk 1106. The fixed gear disk 1107 is fixedly connected to the lower clamp 5, and the axis of the fixed gear disk 1107 coincides with the axis of the rotating shaft 6. The middle part of the synchronous shaft 1108 is prismatic, and the synchronous shaft 1108 is fixedly connected to the rotating shaft 6. A positioning spring 1109 abuts against the other side of the movable gear disk 1106. The specific operation is as follows: When the flexible protective sleeve 3 is pinched, the pressure plate 1103 is pressed simultaneously, causing the rotating plate 1102 to rotate around the connecting shaft 1101. The protrusion 1104 squeezes the inclined curved surface of the drive ring 1105, causing the movable gear plate 1106 to separate from the fixed gear plate 1107. Therefore, it will not hinder the rotation between the upper clamp 4 and the lower clamp 5, thus facilitating the opening of the clamping ends of the upper clamp 4 and the lower clamp 5 for clamping operations. When the hand is released after clamping, the positioning spring 1109 will push the movable gear plate 1106 to engage with the fixed gear plate 1107. At this time, when the clamping ends of the upper clamp 4 and the lower clamp 5 face each other... During movement, the rotating shaft 6 drives the movable gear disk 1106 to rotate synchronously via the synchronous shaft 1108. At this time, under the action of the inclined surfaces of the tooth grooves of the movable gear disk 1106 and the fixed gear disk 1107, a certain component force is generated to squeeze the positioning spring 1109, thereby causing the movable gear disk 1106 to rotate unidirectionally on the side of the fixed gear disk 1107, which meets the normal clamping requirements. After clamping, if the clamping part is accidentally pulled, causing the movable gear disk 1106 to have a tendency to rotate in the opposite direction, its tooth groove surface will fit against the tooth groove surface of the fixed gear disk 1107, thus restricting the opening movement of the chuck, thereby enhancing the stability during clamping and preventing accidental loosening.

[0023] In summary, this insulation resistance testing device for power distribution equipment is used as follows: First, by pinching the upper and lower sides of the protective sleeve 3, the pressure plate 1103 will be pressed simultaneously, causing the rotating plate 1102 to rotate around the connecting shaft 1101. The protrusion 1104 squeezes the inclined curved surface of the drive ring 1105, causing the movable toothed disc 1106 to separate from the fixed toothed disc 1107. Therefore, it will not hinder the rotation between the upper clamping seat 4 and the lower clamping seat 5, thus making it convenient to open the clamping ends of the upper clamping seat 4 and the lower clamping seat 5 for clamping operation. Secondly, since there is no obstruction on the brush bristle side of the brush plate 904, the return spring 907 will push the brush plate 904 away from the slider 906. The hanging plate 903 will drive the guide column 902 to slide along the vertical groove of the guide groove 901 to the inclined groove section. Subsequently, when the brush plate 904 is misaligned with the conductive clamp 8, under the action of the tension spring 908 with greater elasticity, it will pull the adjacent slider 906 to move in the center, thereby driving the guide column 902 to slide in the inclined groove of the guide groove 901 until the two brush plates 904 are in contact. At the same time, the other end of the upper clamp 4 and the lower clamp 5 will squeeze the telescopic airbag 1008, so that the air inside it will be discharged from the exhaust pipe 1009 to the outside of the protective sleeve 3 through the one-way valve. Next, when the hand force is stopped, the torsion spring 7 will apply a pushing force to one end of the upper clamp 4 and the lower clamp 5, causing them to rotate around the rotating shaft 6. The brush plate 904 will first clamp the part to be tested. Since the elastic force of the torsion spring 7 is greater than that of the tension spring 908, under the guidance of the guide post 902 and the inclined groove section of the guide groove 901, the brush plate 904 will be driven to separate to both sides, making room for the final clamping of the conductive clamp 8. At the same time, it can also brush and clean the clamping part, effectively removing most of the non-fastening surface contaminants, allowing the conductive clamp 8 to directly contact a cleaner metal substrate. In this process... In the middle, the upper clamp 4 and the lower clamp 5 will also pull the telescopic airbag 1008, creating a negative pressure inside it. This will draw air from inside the brush plate 904 through the hose 1007 and the one-way valve, and adsorb the cleaned dust through the suction hole 1001 to reduce dust scattering. Finally, the dust is filtered and collected by the filter bag 1006, which is more environmentally friendly. Furthermore, when disassembling and cleaning the filter bag 1006, you only need to forcefully pull the buckle 1003 to make it elastically deform and separate from the clip 1004, so that the connecting frame 1005 can be removed from inside the brush plate 904, making disassembly and maintenance very convenient. Then, when the brush plate 904 moves to both sides of the conductive clamping block 8, the brush plate 904 will compress the return spring 907, and the conductive clamping block 8 can then contact the cleaned clamping part. Thus, during operation, the clamping part can be automatically brushed and cleaned without adding any extra steps, improving the convenience of use and the accuracy of detection. After releasing, the positioning spring 1109 will push the movable toothed disc 1106 to engage with the fixed toothed disc 1107. At this time, when the clamping ends of the upper clamping seat 4 and the lower clamping seat 5 move towards each other, the rotating shaft 6 will drive the synchronous shaft 1108 to move towards the upper clamping seat 4. The movable toothed disc 1106 rotates synchronously. At this time, under the action of the inclined surfaces of the tooth grooves of the movable toothed disc 1106 and the fixed toothed disc 1107, a certain component force will be generated to squeeze the positioning spring 1109, thereby causing the movable toothed disc 1106 to rotate unidirectionally on the side of the fixed toothed disc 1107, which meets the normal clamping requirements. After clamping, if the clamping part is accidentally pulled, causing the movable toothed disc 1106 to have a tendency to rotate in the opposite direction, its tooth groove surface will fit against the tooth groove surface of the fixed toothed disc 1107, thus restricting the opening and movement of the chuck, thereby enhancing the stability during clamping and preventing accidental loosening. Finally, after confirming that the power distribution equipment has been de-energized and fully discharged, start megohmmeter 1 to measure its insulation resistance performance.

[0024] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A device for detecting the insulation resistance of power distribution equipment, characterized in that, The device includes a megohmmeter (1) and a cleaning assembly (9). A cable (2) is connected to one side of the megohmmeter (1), and a protective sleeve (3) is provided at one end of the cable (2). An upper clamp (4) is bonded to the upper inner side of the protective sleeve (3), and a lower clamp (5) is bonded to the lower inner side of the protective sleeve (3). A rotating shaft (6) is fixed in the middle of the upper clamp (4), and a torsion spring (7) is sleeved on the outer side of the rotating shaft (6). A conductive clamp (8) is fixed at one end of the upper clamp (4) and the lower clamp (5). The cleaning assembly (9) is located at one end of the upper clamp (4) and the lower clamp (5), and the cleaning assembly (9) includes a guide groove. (901) One end of the upper clamp (4) and the lower clamp (5) is provided with a guide groove (901), and a guide post (902) is slidably connected inside the guide groove (901). A hanging plate (903) is fixed in the middle of the guide post (902), and a brush plate (904) is placed at one end of the hanging plate (903). A vertical rod (905) is fixed in the middle of one side of the brush plate (904), and a slider (906) is slidably connected to the outer side of the middle of the vertical rod (905). A return spring (907) is abutted on one side of the slider (906), and a tension spring (908) is fixed between the two sliders (906).

2. The insulation resistance testing device for power distribution equipment according to claim 1, characterized in that, The guide groove (901) is composed of a vertical groove and an inclined groove, and the width of the guide groove (901) matches the diameter of the guide post (902).

3. The insulation resistance testing device for power distribution equipment according to claim 1, characterized in that, The sliders (906) located at the top and bottom are slidably connected to the upper clamp (4) and the lower clamp (5) respectively, and the lower clamp (5) is rotatably connected to the rotating shaft (6).

4. The insulation resistance testing device for power distribution equipment according to claim 1, characterized in that, The conductive clamp (8) is electrically connected to the cable (2) via a wire, and the length of the conductive clamp (8) is less than the length of the brush plate (904).

5. The insulation resistance testing device for power distribution equipment according to claim 1, characterized in that, A dust removal assembly (10) is provided between the upper clamp (4) and the lower clamp (5), and the dust removal assembly (10) includes an air suction hole (1001). An air suction hole (1001) is provided on one side of the brush plate (904), and a cover plate (1002) is connected to one end of the brush plate (904). A buckle (1003) is fixed on one side of the cover plate (1002), and a locking strip (1003) abuts against one end of the buckle (1003). 4) A connecting frame (1005) is fixed in the middle of the cover plate (1002), and a filter bag (1006) is placed at one end of the connecting frame (1005). A hose (1007) is connected to one end of the brush plate (904) through a one-way valve. A telescopic airbag (1008) is fixed between the upper clamp (4) and the lower clamp (5), and an exhaust pipe (1009) is connected to the lower part of the telescopic airbag (1008) through a one-way valve.

6. The insulation resistance testing device for power distribution equipment according to claim 5, characterized in that, The brush plate (904) is hollow in the middle and is slidably connected to the connecting frame (1005).

7. The insulation resistance testing device for power distribution equipment according to claim 5, characterized in that, The telescopic airbag (1008) is connected to the hose (1007), and the hoses (1007) located at the upper and lower positions are fixedly connected to the upper clamp (4) and the lower clamp (5) respectively.

8. The insulation resistance testing device for power distribution equipment according to claim 5, characterized in that, One side of the upper clamp (4) is connected to an anti-detachment component (11), and the anti-detachment component (11) includes a connecting shaft (1101). The connecting shaft (1101) is placed on one side of the upper clamp (4), and a rotating plate (1102) is rotatably connected to the outer side of the connecting shaft (1101). A pressure plate (1103) is fixed on the upper part of the rotating plate (1102), and a protrusion (1104) is placed on the lower end of one side of the rotating plate (1102). One end of the protrusion (1104) abuts against a drive ring (1105), and a movable gear plate (1106) is fixed inside the drive ring (1105). A fixed gear plate (1107) is fitted on one side of the movable gear plate (1106), and a synchronous shaft (1108) is slidably connected inside the movable gear plate (1106). A positioning spring (1109) abuts against the other side of the movable gear plate (1106).

9. The insulation resistance testing device for power distribution equipment according to claim 8, characterized in that, The fixed gear plate (1107) is fixedly connected to the lower clamp (5), and the axis of the fixed gear plate (1107) coincides with the axis of the rotating shaft (6).

10. The insulation resistance testing device for power distribution equipment according to claim 8, characterized in that, The middle part of the synchronous shaft (1108) is prismatic, and the synchronous shaft (1108) is fixedly connected to the rotating shaft (6).

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