A method for testing porcelain insulators and the equipment used for testing.

Abstract

This invention discloses a method and equipment for testing porcelain insulators, relating to the field of porcelain insulator testing technology. The method includes a base, a support frame mounted on top of the base, a hanging rod mounted on top of the support frame, a vertical pull member mounted on top of the box cover, and a winding connector mounted on the connecting chamber. By using the vertical pull member, the method pulls the placement plate upwards, causing the buckle to move to the bottom of the porcelain insulator. Rotating the buckle secures it to the bottom of the porcelain insulator. Releasing the placement plate allows it to pull the buckle under the elastic restoring force of the telescopic spring, thus keeping the multiple porcelain insulators connected in series vertical. This prevents skew between the insulators, ensures reliable contact between them, improves the safety and accuracy of withstand voltage testing, and prevents the buckle from continuously applying tension to the porcelain insulator under the action of the telescopic spring.

Description

Technical Field

[0001] This invention relates to the field of porcelain insulator testing technology, specifically a porcelain insulator testing method and testing equipment. Background Technology

[0002] Porcelain insulators are critical insulating components widely used in power transmission and distribution systems. Their main function is to support and isolate live conductors, preventing current from leaking to the ground or other conductors through unintended paths, thereby ensuring the safe operation of the power system. Testing the withstand voltage, insulation, and mechanical properties of insulators not only identifies existing defects but also provides crucial data support for insulator fault prediction and health management. Continuous monitoring of the electrical characteristics and structural state changes of insulators enables early warning of degradation, lifespan assessment, and full lifecycle maintenance decisions, thereby improving the intelligent management and control level of the power grid, reducing the risk of sudden faults, and ensuring the long-term safe and reliable operation of transmission lines. As a key component in the power transmission system, the insulation performance of porcelain insulators directly affects the safe and stable operation of the power grid; therefore, after porcelain insulators are manufactured, their insulation performance needs to be tested.

[0003] In general, when testing porcelain insulators, multiple porcelain insulators connected in series are simply suspended on a support frame. This causes the insulators to bend and sway during the testing process, which affects the stability of the testing status. Loose or skewed insulators can easily cause partial discharge and also lead to distorted test data. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that the insulator's own skewness affects the accuracy of the test data when performing withstand voltage tests on porcelain insulators, and to provide a method for testing porcelain insulators and the equipment used for testing.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a porcelain insulator testing device, comprising a base, a support frame mounted on the top of the base, a hanging rod mounted on the top of the support frame, a water tank mounted on the top of the base below the hanging rod, a tank cover mounted on the top of the water tank, a pull vertical member mounted on the top of the tank cover, a buckle connected to the top of the tank cover via the pull vertical member, connecting compartments mounted at both ends of the support frame, a winding connector mounted on the connecting compartment, and a conductive electrode plate mounted on one side of the connecting compartment via the winding connector; The vertical pull member includes a telescopic spring installed on the top of the box cover. The top of the telescopic spring is connected to a placement plate. The top of the placement plate is rotatably connected to a buckle via a pivot. The inner side of the support frame is provided with a sliding groove. The two sides of the placement plate are provided with sliders that are slidably connected to the sliding groove.

[0006] As a further embodiment of the present invention: the vertical pull member further includes a clamping plate installed on both sides of the base, a top plate is installed on both sides of the top of the support frame, a corrugated telescopic tube is provided at the bottom of the top plate, a bottom plate connected to the slider is provided at the bottom end of the corrugated telescopic tube, a limiting rod connected to the clamping plate is provided on the outer side of the top plate, and solenoid valves are provided on both sides of the water tank, with a guide pipe connected to the bottom of the bottom plate at one end of the solenoid valve.

[0007] As a further embodiment of the present invention: the outer wall diameter of the corrugated telescopic tube is larger than the diameter of the top plate, and multiple limiting rods are provided, with the multiple limiting rods being distributed at equal distances along the center of the top plate, and the outer wall of the corrugated telescopic tube is in contact with the limiting rods.

[0008] As a further aspect of the present invention: the top of the tank cover is provided with ventilation slots located on both sides of the telescopic spring, through which outside air is allowed to enter the water tank.

[0009] As a further embodiment of the present invention: the winding connector includes a spring installed inside the connecting chamber, one end of the spring being connected to a traction rope extending to the outside of the connecting chamber, a C-shaped frame being fixedly connected to one side of the connecting chamber, two rollers being arranged symmetrically along the transverse central axis of the C-shaped frame, one end of the traction rope passing between the two rollers, and a positioning frame being installed at the end of the traction rope away from the connecting chamber, and a conductive electrode plate electrically connected to an external controller being provided on the positioning frame.

[0010] As a further embodiment of the present invention: the winding connector further includes a sleeve installed at one end of the C-shaped frame, an air pipe installed at the end of the sleeve away from the C-shaped frame, a partition installed on the inner side of the sleeve, the inner side of the sleeve being divided into an air storage chamber and a connecting chamber by the partition, a rectangular block penetrating the partition and extending to the inner side of the connecting chamber is provided on the inner side of the air storage chamber, a reciprocating screw extending to the inner side of the connecting chamber is provided on one side of the rotating wheel, and a piston block is installed at the end of the rectangular block away from the reciprocating screw.

[0011] As a further embodiment of the present invention: the rectangular block is sleeved on the outside of the reciprocating lead screw, and a crescent pin matching the outside of the reciprocating lead screw is provided at one end of the rectangular block near the reciprocating lead screw.

[0012] As a further embodiment of the present invention: the inner wall diameter of the air tube is smaller than the inner wall diameter of the air storage chamber, and the periphery of the piston block is in contact with the air storage chamber.

[0013] As a further aspect of the present invention: an anti-slip pad is provided on the outer side of the rotating wheel, and the gap between the two rotating wheels is smaller than the diameter of the traction rope.

[0014] This invention also discloses a method for testing porcelain insulators, which uses the aforementioned porcelain insulator testing equipment and includes the following steps: S1: First, attach the tops of multiple series-connected porcelain insulators to the outside of the hanging rod, and then use the hanging rod to support the series-connected porcelain insulators; S2: Pull the placement plate upwards to move the buckle to the bottom of the porcelain insulator. During this process, the telescopic spring extends. Then, rotate the buckle to fasten it to the bottom of the porcelain insulator. S3: Release the placement plate. At this time, the placement plate will pull the buckle under the elastic restoring force of the telescopic spring, so as to make the multiple porcelain insulators connected in series in a vertical state. The buckle is positioned by pulling the vertical part. S4: Then, clamp the conductive electrode plates to the top and bottom of the porcelain insulator respectively, and then perform a withstand voltage test on the porcelain insulator by energizing the conductive electrode plates. S5: After the test is completed, remove the conductive electrode sheets from the top and bottom of the porcelain insulator. At this time, the conductive electrode sheets will be reset by the winding connector.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a vertical puller, the placement plate is pulled upwards, causing the buckle to move to the bottom of the porcelain insulator. The buckle is then rotated to secure it to the bottom of the porcelain insulator. The placement plate is then released, and under the elastic restoring force of the telescopic spring, it pulls the buckle to keep the multiple porcelain insulators connected in series vertical, thus preventing them from tilting. Afterwards, the solenoid valve is closed by an external controller, and the solution inside the corrugated telescopic tube loses its flow space. This positions the placement plate and fixes the buckle, protecting the porcelain insulator from damage due to excessive tension. It also ensures reliable contact between the porcelain insulators, improves the safety and accuracy of the withstand voltage test, and prevents the buckle from continuously applying tension to the porcelain insulator under the action of the telescopic spring. 2. By setting up a winding connector, when the conductive electrode sheet is pulled, the positioning frame will pull the traction rope. At this time, the spring will wind up along with the traction rope. During this process, the traction rope drives the rotating wheel to rotate. After the conductive electrode sheet is clamped and connected to the porcelain insulator, the spring will remain in the wound state. After the test is completed, the conductive electrode sheet is removed from the porcelain insulator. At this time, the conductive electrode sheet is released, and the traction rope will retract into the connecting chamber under the elastic restoring force of the spring. At this time, the positioning frame will move to the initial position. During this process, the rotating wheel drives the reciprocating screw to rotate. The rectangular block moves back and forth along the reciprocating screw. During this process, the piston block draws air from around the air tube or ejects air from the end of the piston block away from the rectangular block through the air tube. This slows down the rotation speed of the rotating wheel, thereby reducing the speed at which the traction rope retracts into the connecting chamber. This prevents the electrode plate from colliding with the positioning frame due to excessive movement speed during the recovery process. At the same time, the positioning frame drives the electrode plate to reset, preventing the electrode plate from contacting dust on the ground. This prevents the detection effect from being affected by a large amount of dust on the surface of the electrode plate, further improving the accuracy of the detection data. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the image; Figure 3 This is a schematic diagram showing the connection between the water tank and the corrugated expansion pipe of the present invention; Figure 4 This is a schematic diagram showing the connection between the top plate and the bottom plate of the present invention; Figure 5 This is a schematic diagram showing the connection between the connecting compartment and the conductive electrode sheet of the present invention; Figure 6 This is a schematic diagram of the internal structure of the connecting compartment of the present invention; Figure 7 This is a schematic diagram showing the connection between the rotating wheel and the sleeve of the present invention; Figure 8 This is a schematic diagram of the internal structure of the sleeve of the present invention.

[0017] In the diagram: 1. Base; 2. Support frame; 3. Hanging rod; 4. Water tank; 5. Telescopic spring; 6. Placement plate; 7. Slide groove; 8. Connecting compartment; 9. Top plate; 10. Corrugated telescopic tube; 11. Bottom plate; 12. Buckle; 13. C-shaped frame; 14. Rotary wheel; 15. Sleeve; 16. Air pipe; 17. Positioning frame; 18. Conductive electrode plate; 19. Slider; 20. Guide tube; 21. Box cover; 22. Solenoid valve; 23. Ventilation groove; 24. Limiting rod; 25. Clamping plate; 26. Traction rope; 27. Clock spring; 28. Piston block; 29. ​​Rectangular block; 30. Partition plate; 31. Reciprocating screw; 32. Connecting cavity; 33. Air storage cavity. Detailed Implementation

[0018] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0020] Please see Figures 1 to 8In this embodiment of the invention, a porcelain insulator testing device includes a base 1, a support frame 2 installed on the top of the base 1, a hanging rod 3 installed on the top of the support frame 2, a water tank 4 located below the hanging rod 3 installed on the top of the base 1, a tank cover 21 provided on the top of the water tank 4, a pull vertical member installed on the top of the tank cover 21, and a buckle 12 connected to the top of the tank cover 21 through the pull vertical member. Connecting compartments 8 are installed at both ends of the support frame 2, and a winding connector is provided on the connecting compartment 8. A conductive electrode sheet 18 is installed on one side of the connecting compartment 8 through the winding connector. The vertical pull-out component includes a telescopic spring 5 installed on the top of the box cover 21. The top of the telescopic spring 5 is connected to a placement plate 6. The top of the placement plate 6 is rotatably connected to a buckle 12 via a pivot. The inner side of the support frame 2 is provided with a sliding groove 7. The two sides of the placement plate 6 are provided with sliders 19 that are slidably connected to the sliding groove 7.

[0021] In this embodiment: First, the tops of multiple series-connected porcelain insulators are fastened to the outside of the hanging rod 3, supporting the series-connected porcelain insulators. Then, the placement plate 6 is pulled upwards, causing the buckle 12 to move to the bottom of the porcelain insulator. During this process, the telescopic spring 5 extends. Subsequently, the buckle 12 is fastened to the bottom of the porcelain insulator by rotating it. The placement plate 6 is then released. At this time, the placement plate 6 will pull the buckle 12 under the elastic restoring force of the telescopic spring 5, thereby keeping the series-connected porcelain insulators in a vertical position and preventing the porcelain insulators from tilting. The buckle 12 is positioned by pulling the vertical member to prevent it from continuously applying tension to the porcelain insulator under the action of the telescopic spring 5. Then, the conductive electrode 18 is clamped at the top and bottom of the porcelain insulator respectively. Subsequently, the porcelain insulator is tested for withstand voltage by energizing the conductive electrode 18. After the test is completed, the conductive electrode 18 is removed from the top and bottom of the porcelain insulator. At this time, the conductive electrode 18 will be reset by the action of the winding connector to prevent the conductive electrode 18 from falling to the ground and causing a large amount of dust to adhere to its surface, thereby further improving the accuracy of the test data.

[0022] Please refer to this carefully. Figure 1 , Figure 3 , Figure 4 The vertical puller also includes a clamping plate 25 installed on both sides of the base 1. A top plate 9 is installed on both sides of the top of the support frame 2. A corrugated telescopic tube 10 is provided at the bottom of the top plate 9. A bottom plate 11 connected to the slider 19 is provided at the bottom end of the corrugated telescopic tube 10. A limiting rod 24 connected to the clamping plate 25 is provided on the outer side of the top plate 9. Solenoid valves 22 are provided on both sides of the water tank 4. A guide pipe 20 connected to the bottom of the bottom plate 11 is provided at one end of the solenoid valve 22.

[0023] The outer diameter of the corrugated telescopic tube 10 is larger than the diameter of the top plate 9. Multiple limiting rods 24 are provided, and the multiple limiting rods 24 are distributed at equal distances along the center of the top plate 9. The outer wall of the corrugated telescopic tube 10 is in contact with the limiting rods 24. The top of the box cover 21 is provided with ventilation slots 23 located on both sides of the telescopic spring 5, through which outside air is allowed to enter the water tank 4.

[0024] In this embodiment: when the placement plate 6 moves the slider 19 upward, the base plate 11 moves upward with the slider 19, thereby squeezing the solution inside the corrugated expansion tube 10. At this time, the solution inside the corrugated expansion tube 10 enters the solenoid valve 22 through the guide tube 20 and the box cover 21. When the extension spring 5 pulls the placement plate 6, the base plate 11 moves downward with the placement plate 6, thereby allowing the solution inside the water tank 4 to enter the corrugated expansion tube 10 under negative pressure, thus achieving the extraction of the solution inside the water tank 4. Then, the solenoid valve 22 is closed by the external controller. At this time, the solution inside the corrugated expansion tube 10 loses its flow space, thus positioning the placement plate 6 and fixing the buckle 12, thereby protecting the porcelain insulator from damage by excessive tension, while ensuring reliable contact between the porcelain insulators, and improving the safety and accuracy of the withstand voltage test.

[0025] Please refer to this carefully. Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 The winding connector includes a spring 27 installed inside the connecting chamber 8. One end of the spring 27 is connected to a traction rope 26 extending to the outside of the connecting chamber 8. A C-shaped frame 13 is fixedly connected to one side of the connecting chamber 8. Two rollers 14 are arranged inside the C-shaped frame 13. The two rollers 14 are symmetrically arranged along the transverse central axis of the C-shaped frame 13. One end of the traction rope 26 passes between the two rollers 14. A positioning frame 17 is installed at the end of the traction rope 26 away from the connecting chamber 8. A conductive electrode plate 18 electrically connected to an external controller is provided on the positioning frame 17. The winding connector also includes a sleeve 15 installed at one end of the C-shaped frame 13. An air pipe 16 is installed at the end of the sleeve 15 away from the C-shaped frame 13. A partition 30 is installed on the inner side of the sleeve 15. The inner side of the sleeve 15 is divided into an air storage chamber 33 and a connecting chamber 32 by the partition 30. A rectangular block 29 is provided on the inner side of the air storage chamber 33, penetrating the partition 30 and extending to the inner side of the connecting chamber 32. A reciprocating screw 31 is provided on one side of the rotating wheel 14, extending to the inner side of the connecting chamber 32. A piston block 28 is installed at the end of the rectangular block 29 away from the reciprocating screw 31.

[0026] The rectangular block 29 is sleeved on the outside of the reciprocating screw 31. The end of the rectangular block 29 near the reciprocating screw 31 is provided with a crescent pin that matches the outside of the reciprocating screw 31. The inner diameter of the air pipe 16 is smaller than the inner diameter of the air storage chamber 33. The periphery of the piston block 28 fits against the air storage chamber 33. The outer side of the rotating wheel 14 is provided with an anti-slip pad. The gap between the two rotating wheels 14 is smaller than the diameter of the traction rope 26.

[0027] In this embodiment: when the conductive electrode plate 18 is pulled, the positioning frame 17 will pull the traction rope 26. At this time, the spring 27 will wind up along with the traction rope 26. During this process, the traction rope 26 will drive the rotating wheel 14 to rotate. After the conductive electrode plate 18 is clamped and connected to the porcelain insulator, the spring 27 will remain in the wound state. After the test is completed, the conductive electrode plate 18 is removed from the porcelain insulator. At this time, the conductive electrode plate 18 is released, and the traction rope 26 will retract into the connecting chamber 8 under the elastic restoring force of the spring 27. At this time, the positioning frame 17 will move to the initial position. During this process, the rotating wheel 14 drives the reciprocating screw 31 to rotate, thereby making The rectangular block 29 moves back and forth along the reciprocating screw 31. At this time, the piston block 28 will draw air from the air pipe 16 or spray air from the end of the piston block 28 away from the rectangular block 29 through the air pipe 16, thereby slowing down the rotation speed of the rotating wheel 14. This reduces the speed at which the traction rope 26 retracts into the connecting chamber 8, preventing the electrode plate 18 from being hit due to excessive movement speed during the resetting process of the positioning frame 17. At the same time, the resetting of the electrode plate 18 by the positioning frame 17 prevents the electrode plate 18 from contacting the ground dust, thereby preventing the detection effect from being affected by a large amount of dust on the surface of the electrode plate 18, and further improving the accuracy of the detection data.

[0028] The following describes a method for testing porcelain insulators, based on the aforementioned porcelain insulator testing equipment, specifically including the following steps: S1: First, attach the tops of multiple series-connected porcelain insulators to the outside of the hanging rod 3, and use the hanging rod 3 to support the series-connected porcelain insulators; S2: Pull the placement plate 6 upwards so that the buckle 12 moves to the bottom of the porcelain insulator. During this process, the telescopic spring 5 extends. Then, by rotating the buckle 12, the buckle 12 is fastened to the bottom of the porcelain insulator. When the placement plate 6 moves the slider 19 upwards, the bottom plate 11 will move upwards with the slider 19, so that the bottom plate 11 squeezes the solution inside the corrugated telescopic tube 10. At this time, the solution inside the corrugated telescopic tube 10 will enter the solenoid valve 22 through the guide tube 20 and the box cover 21. S3: Release the placement plate 6. At this time, the placement plate 6 will be pulled by the elastic restoring force of the telescopic spring 5 to pull the buckle 12, so that the multiple porcelain insulators connected in series are in a vertical state. Then, the solenoid valve 22 is closed by the external controller. At this time, the solution inside the corrugated telescopic tube 10 will lose its flow space, thus positioning the placement plate 6 and fixing the buckle 12. This protects the porcelain insulators from damage by excessive tension, while ensuring reliable contact between the porcelain insulators and improving the safety and accuracy of the withstand voltage test. S4: Then, the conductive electrode 18 is clamped on the top and bottom of the porcelain insulator respectively, and the withstand voltage test of the porcelain insulator is performed by energizing the conductive electrode 18. S5: After the test is completed, remove the conductive electrode 18 from the porcelain insulator. At this time, release the conductive electrode 18, and the traction rope 26 will retract into the connecting chamber 8 under the elastic restoring force of the spring 27. At this time, the positioning frame 17 will move to the initial position. During this process, the rotating wheel 14 drives the reciprocating screw 31 to rotate, so that the rectangular block 29 moves back and forth along the reciprocating screw 31. At this time, the piston block 28 will draw air from the air pipe 16, or spray the air away from the end of the piston block 28 away from the rectangular block 29 through the air pipe 16, thereby slowing down the rotation speed of the rotating wheel 14, thereby reducing the speed at which the traction rope 26 retracts into the connecting chamber 8, preventing the conductive electrode 18 from being hit due to excessive movement speed during the restoration process of the positioning frame 17. At the same time, the positioning frame 17 drives the conductive electrode 18 to reset, preventing the conductive electrode 18 from contacting the ground dust, thereby preventing the detection effect from being affected by a large amount of dust on the surface of the conductive electrode 18, and further improving the accuracy of the detection data.

[0029] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A porcelain insulator testing device, comprising a base (1), characterized in that, A support frame (2) is installed on the top of the base (1), a hanging rod (3) is installed on the top of the support frame (2), a water tank (4) is installed on the top of the base (1) below the hanging rod (3), a tank cover (21) is provided on the top of the water tank (4), a pull vertical member is installed on the top of the tank cover (21), and a buckle (12) is connected to the top of the tank cover (21) through the pull vertical member. Connecting compartments (8) are installed at both ends of the support frame (2), a winding connector is provided on the connecting compartment (8), and a conductive electrode sheet (18) is installed on one side of the connecting compartment (8) through the winding connector. The vertical pull member includes a telescopic spring (5) installed on the top of the box cover (21). The top of the telescopic spring (5) is connected to a placement plate (6). The top of the placement plate (6) is rotatably connected to a buckle (12) via a pivot. The inner side of the support frame (2) is provided with a sliding groove (7). The two sides of the placement plate (6) are provided with sliders (19) that are slidably connected to the sliding groove (7).

2. The porcelain insulator testing equipment according to claim 1, characterized in that, The vertical pull-out component also includes a clamping plate (25) installed on both sides of the base (1). A top plate (9) is installed on both sides of the top of the support frame (2). A corrugated telescopic tube (10) is provided at the bottom of the top plate (9). A bottom plate (11) connected to the slider (19) is provided at the bottom end of the corrugated telescopic tube (10). A limiting rod (24) connected to the clamping plate (25) is provided on the outside of the top plate (9). A solenoid valve (22) is provided on both sides of the water tank (4). A guide pipe (20) connected to the bottom of the bottom plate (11) is provided at one end of the solenoid valve (22).

3. The porcelain insulator testing equipment according to claim 2, characterized in that, The outer diameter of the corrugated expansion tube (10) is larger than the diameter of the top plate (9). There are multiple limiting rods (24), and the multiple limiting rods (24) are distributed at equal distances along the center of the top plate (9). The outer wall of the corrugated expansion tube (10) is in contact with the limiting rods (24).

4. The porcelain insulator testing equipment according to claim 2, characterized in that, The top of the cover (21) is provided with ventilation slots (23) located on both sides of the telescopic spring (5), through which outside air is allowed to enter the water tank (4).

5. The porcelain insulator testing equipment according to claim 2, characterized in that, The winding connector includes a spring (27) installed inside the connecting chamber (8). One end of the spring (27) is connected to a traction rope (26) extending to the outside of the connecting chamber (8). A C-frame (13) is fixedly connected to one side of the connecting chamber (8). Two rollers (14) are provided inside the C-frame (13). The two rollers (14) are symmetrically arranged along the transverse central axis of the C-frame (13). One end of the traction rope (26) passes between the two rollers (14). A positioning frame (17) is installed at the end of the traction rope (26) away from the connecting chamber (8). A conductive electrode plate (18) electrically connected to an external controller is provided on the positioning frame (17).

6. The porcelain insulator testing equipment according to claim 5, characterized in that, The winding connector also includes a sleeve (15) installed at one end of the C-frame (13). An air pipe (16) is installed at the end of the sleeve (15) away from the C-frame (13). A partition (30) is installed on the inner side of the sleeve (15). The inner side of the sleeve (15) is divided into an air storage chamber (33) and a connecting chamber (32) by the partition (30). A rectangular block (29) is provided on the inner side of the air storage chamber (33) that penetrates the partition (30) and extends to the inner side of the connecting chamber (32). A reciprocating screw (31) is provided on one side of the rotating wheel (14) that extends to the inner side of the connecting chamber (32). A piston block (28) is installed at the end of the rectangular block (29) away from the reciprocating screw (31).

7. The porcelain insulator testing device according to claim 6, characterized in that, The rectangular block (29) is sleeved on the outside of the reciprocating lead screw (31), and a crescent pin matching the outside of the reciprocating lead screw (31) is provided at one end of the rectangular block (29) near the reciprocating lead screw (31).

8. The porcelain insulator testing equipment according to claim 6, characterized in that, The inner diameter of the trachea (16) is smaller than the inner diameter of the gas storage chamber (33), and the periphery of the piston block (28) is in contact with the gas storage chamber (33).

9. A porcelain insulator testing device according to claim 6, characterized in that, The outer side of the wheel (14) is provided with an anti-slip pad, and the gap between the two wheels (14) is smaller than the diameter of the traction rope (26).

10. A method for testing porcelain insulators, characterized in that, The porcelain insulator testing equipment according to any one of claims 1-9 includes the following steps: S1: First, attach the top of multiple series-connected porcelain insulators to the outside of the hanging rod (3) and support the series-connected porcelain insulators through the hanging rod (3); S2: Pull the placement plate (6) upward to move the buckle (12) to the bottom of the porcelain insulator. During this process, the telescopic spring (5) extends. Then, by rotating the buckle (12), the buckle (12) is fastened to the bottom of the porcelain insulator. S3: Release the placement plate (6). At this time, the placement plate (6) will pull the buckle (12) under the elastic restoring force of the telescopic spring (5) so that the multiple porcelain insulators connected in series are in a vertical state and the buckle (12) is positioned by pulling the vertical part. S4: Then the conductive electrode sheet (18) is clamped on the top and bottom of the porcelain insulator respectively, and the withstand voltage test of the porcelain insulator is performed by energizing the conductive electrode sheet (18); S5: After the test is completed, remove the conductive electrode sheet (18) from the top and bottom of the porcelain insulator. At this time, the conductive electrode sheet (18) will be reset under the action of the winding connector.

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