A cold and hot cycle test device for insulators

Abstract

The utility model relates to an insulator cold and hot cycle test device, belongs to insulator test technical field. Including main frame (1), high temperature test unit (8) and low temperature test unit (9) are arranged side by side in main frame (1), still be provided with the hanger (6) for placing the insulator (7) to be measured in main frame (1), the top movable setting of main frame (1) has the hoisting unit (4), the hoisting unit (4) is connected with the hanger (6) through flexible connecting piece, and is used for driving hanger (6) to lift and translate, its characterized in that: the flexible connecting piece including at least three from hoisting unit (4) leads out, and the line of any three connecting points between flexible connecting piece and hanger (6) constitutes only plane. In the insulator cold and hot cycle test device of the application, through the way of flexible connecting piece multi-point hoisting, avoid the rigidity hoisting drawbacks of mechanical arm and other rigid hoisting in the prior art, improve the stability of the insulator to be measured when hoisting in the cold and hot cycle test.

Description

Technical Field

[0001] A thermal cycling test device for insulators belongs to the field of insulator testing technology. Background Technology

[0002] Insulators are a common type of insulation control and play an important role in overhead transmission lines. Most insulators are installed on exposed transmission lines and are easily affected by weather factors. Insulators exposed to sun and rain are easily damaged. Therefore, insulators need to undergo temperature tests of hot and cold cycles after production.

[0003] In existing technologies, the most common implementation involves setting up two water tanks, one cold and one hot, and a hoisting mechanism. The insulator to be tested is placed in a hollow container (such as a frame), and the hoisting mechanism is connected to the container holding the insulator. The hoisting mechanism then cyclically moves the insulator and the container between the cold and hot water tanks to achieve the cold and hot cycle test. Currently, the hoisting mechanism often employs rigid structures such as various robotic arms and lifting frames, and uses cylinders as power sources. Examples include the technical solution described in Chinese Utility Model Patent Application No. 201922346247.X, filed on December 24, 2019, entitled "A Cold and Hot Cycling Test Device"; and the technical solution described in Chinese Invention Patent Application No. 202210673319.5, filed on June 15, 2022, entitled "An Insulator Temperature Cycling Test Detection Device".

[0004] However, the above-mentioned technical solutions have drawbacks: while using rigid structures such as robotic arms as hoisting mechanisms offers the advantage of high stability, the significant temperature variations and the potential for steam generation during testing can affect electrical structures, including the robotic arm, posing a potential hazard. The Chinese utility model patent application number 202322381669.7, filed on September 4, 2023, entitled "An Auxiliary Device for Thermal Cycling Test of Insulators," describes a technical solution that uses steel cables as traction components and electric hoists as power sources to hoist insulators. This method minimizes the impact of high temperatures and steam, and is relatively low-cost. However, due to the use of a flexible hoisting method, its stability is poor during hoisting. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an insulator cold and hot cycle test device that avoids the drawbacks of rigid hoisting such as mechanical arms in the prior art by using a multi-point hoisting method with flexible connectors, while improving the hoisting stability of the insulator under test during cold and hot cycle tests.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: It includes a main frame, in which a high temperature test unit and a low temperature test unit are arranged side by side. In the main frame, a hanger for placing the insulator to be tested is also provided. A hoisting unit is movably provided on the top of the main frame. The hoisting unit is connected to the hanger through a flexible connector and is used to drive the hanger to rise, fall and move horizontally. The feature is that: the flexible connectors leading out from the hoisting unit include at least three, and the lines connecting any three connection points between the flexible connector and the hanger form a unique plane.

[0007] Preferably, the hoisting unit includes a traveling frame, on which rollers are rotatably mounted. The flexible connectors are multiple steel cables wound around the surface of the rollers. Guide components corresponding to the steel cables are arranged around the rollers. The steel cables pass through the guide components and extend downwards to the hoisting frame.

[0008] Preferably, the guiding assembly includes a guide plate fixed to the surface of the walking frame, at least one guide frame is provided on the surface of the guide plate, and a guide wheel is provided at the end of the guide frame to realize the change of direction of the steel cable.

[0009] Preferably, a sprocket and chain mechanism for moving the hoisting unit is provided at the top of the main frame, and the hoisting unit is fixed to the transmission chain in the sprocket and chain mechanism.

[0010] Preferably, the high-temperature testing unit includes a hot water tank, at least one cover is provided at the upper port of the hot water tank, and a cover driving mechanism for opening and closing each cover is provided on the side of the hot water tank.

[0011] Preferably, a clearance groove corresponding to the flexible connector is provided on the surface of the cover plate.

[0012] Preferably, a steam outlet is provided on the surface of the cover plate, and the steam outlet is connected to an exhaust pipe fixed at the main frame via a pipeline.

[0013] Preferably, a number of position sensors for detecting the position of the hoisting unit are also provided at the top of the main frame. The position sensors are arranged along the travel path of the hoisting unit, and a trigger rod for triggering the position sensors is provided on the side of the hoisting unit.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In the insulator thermal cycling test device of this application, the multi-point hoisting method using flexible connectors avoids the drawbacks of rigid hoisting such as robotic arms in the prior art, while improving the stability of hoisting the insulator under test during thermal cycling tests.

[0016] A steam outlet is provided on the surface of the cover plate. An exhaust pipe is fixed to the upper edge of the corresponding side of the main frame by a fixing bracket. The exhaust pipe is connected to the steam outlet by a hose so that steam can be drawn out when high temperature testing is carried out in the hot water tank, minimizing the impact of steam on the hoisting unit.

[0017] A trigger rod is provided on the side of the traveling frame, and multiple limit switches corresponding to the trigger rod are provided on the outer edge of the main frame. When the trigger rod moves with the traveling frame, it will trigger the corresponding limit switch to position the hoisting unit so that the hoisting unit can accurately deliver the hoisting frame to the corresponding work position. Attached Figure Description

[0018] Figure 1 This is an isometric view of the insulator thermal cycling test apparatus.

[0019] Figure 2 This is a front view of the insulator thermal cycling test apparatus.

[0020] Figure 3 This is an isometric view of the hoisting unit of the insulator thermal cycling test device.

[0021] Figure 4 This is a front view of the hoisting unit of the insulator thermal cycling test device.

[0022] Figure 5 This is an isometric view of the walking drive unit of the insulator thermal cycling test device.

[0023] Figure 6 This is a front view of the walking drive unit of the insulator thermal cycling test device.

[0024] Figure 7 This is an isometric view of the high-temperature test unit of the insulator thermal cycling test device.

[0025] The components include: 1. Main frame; 2. Drive chain; 3. Exhaust pipe; 4. Lifting unit; 5. Starting position; 6. Hanger; 7. Insulator to be tested; 8. High temperature test unit; 9. Low temperature test unit; 10. Limit switch; 11. Driven sprocket seat; 12. Lifting reducer; 13. Guide frame; 14. Lifting motor; 15. Guide plate; 16. Trigger rod; 17. Roller support; 18. Traveling frame; 19. Steel cable; 20. Roller; 21. Drive sprocket seat; 22. Drive shaft; 23. Traveling motor; 24. Travel reducer; 25. Fixing plate; 26. Buffer seat; 27. Hot water tank; 28. Heater; 29. ​​Cylinder fixing seat; 30. Drive cylinder; 31. Hinge seat; 32. Sensor; 33. Hinge plate; 34. Clearance groove; 35. Cover plate; 36. Fixing frame; 37. Traveling drive unit. Detailed Implementation

[0026] Figures 1-7 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-7 The present invention will be further described below.

[0027] like Figures 1-2 As shown, an insulator thermal cycling test device (hereinafter referred to as the test device) includes a main frame 1, which is a rectangular frame structure. Inside the main frame 1, a starting station 5, a high-temperature test station, and a low-temperature test station are arranged sequentially. A low-temperature test unit 9 is arranged at the low-temperature test station, and a high-temperature test unit 8 is arranged at the high-temperature test station. The low-temperature test unit 9 is a cold water tank with an open top. A refrigeration mechanism (not shown in the figure) is arranged on the outside of the main frame 1. The refrigeration mechanism is connected to the cold water tank through a pipeline to achieve water circulation, so as to ensure that the water temperature in the cold water tank meets the temperature requirements. A hoisting unit 4 is arranged at the top of the main frame 1, and the hoisting unit 4 moves back and forth along the length of the main frame 1.

[0028] In this experimental setup, the hoisting unit 4 moves via a sprocket and chain structure: a driven sprocket seat 11 is provided at each of the two vertices at one end of the top of the main frame 1, and a travel drive unit 37 is provided at the other end of the top of the main frame 1. Within the travel drive unit 37, a driving sprocket seat 21 is provided, corresponding to each of the two driven sprocket seats 11 (see...). Figures 5-6 The driven sprocket seat 11 contains a driven sprocket, and the driving sprocket seat 21 contains a driving sprocket. A corresponding set of driving and driven sprockets are connected by a transmission chain 2. The two sides of the hoisting unit 4 are fixed to the two transmission chains 2, thereby driving the hoisting unit 4 through the travel drive unit 37.

[0029] The starting position 5 is the output position of the insulator 7 to be tested. The insulator 7 to be tested is placed in the hanger 6. After the hoisting unit 4 is connected to the hanger 6, the hanger 6 is placed into the low temperature test unit 9 and the high temperature test unit 8 in a certain time and sequence according to the test requirements to complete the cold and hot cycle test.

[0030] like Figures 3-4 As shown, the hoisting unit 4 includes a traveling frame 18, with bottom wheels at the four corners of the bottom of the traveling frame 18. Two bottom wheels on the same side are respectively rolled to the two edges of the top of the main frame 1 along the length direction. A roller bracket 17 is provided on the upper surface of the traveling frame 18, and a roller 20 is arranged laterally inside the roller bracket 17. The roller 20 is rotatably installed inside the roller bracket 17 and is arranged perpendicular to the length direction of the main frame 1.

[0031] A hoisting motor 14 is provided on the side of the roller support 17. A hoisting reducer 12 is fixed at the motor shaft of the hoisting motor 14. The output shaft of the hoisting reducer 12 is coaxially fixed with the roller 20. When the hoisting motor 14 is working, it further drives the roller 20 to rotate through the hoisting reducer 12.

[0032] Multiple guide plates 15 are arranged on the surface of the traveling frame 18. In the plate test device, four guide plates 15 are provided and are respectively arranged at the four corners of the roller support 17. A set of guide frames 13 is provided on the surface of each guide plate 15. Each set includes multiple guide frames 13. A guide wheel is provided at the end of each guide frame 13. One of the four sets of guide frames 13 located at the edge faces downwards and is directly opposite a apex corner of the top surface of the hanger 6.

[0033] Four turns of steel cable 19 are wound around the surface of the roller 20. Each turn of steel cable 19 corresponds to a set of guide frames 13. Each turn of steel cable 19 starts from the roller 20, and the other end passes around each guide wheel in the corresponding set of guide frames 13. After passing the last guide wheel, it extends vertically downward and extends to the top corner of the hanger 6 after passing through the corresponding guide plate 15 and is fixed therein. As is known from common knowledge in the art, the function of the guide wheels in the guide frame 13 is to change the direction of the steel cable 19 and guide the steel cable 19 to the corresponding top corner of the hanger 6. Therefore, the specific number of guide frames 13 in each set and the arrangement direction of the guide wheels in the guide frame 13 are common practices for those skilled in the art and will not be described in detail here.

[0034] In this experimental setup, four steel cables 19 are provided, corresponding to the four corners of the hanger 6. Furthermore, as is known from common knowledge in the art, when at least three steel cables 19 are provided, and the three steel cables 19 extend vertically downward to the hanger 6, forming a triangular arrangement with the connection point of the hanger 6, the three steel cables 19 can mutually restrain each other and significantly reduce swaying during movement when the hanger 6 is hoisted and moved. Therefore, at least three steel cables 19 are provided, but other numbers can also be provided.

[0035] A trigger rod 16 is also provided on one side of the traveling frame 18. The trigger rod 16 extends to the outside of the main frame 1. Multiple limit switches 10 are also provided at the outer edge of the main frame 1. When the trigger rod 16 moves with the traveling frame 18, it will trigger the corresponding limit switch 10. The switching state output by the limit switch 10 will change accordingly to position the hoisting unit 4 so that the hoisting unit 4 can accurately deliver the hoist 6 to the corresponding work position.

[0036] like Figures 5-6As shown, the aforementioned walking drive unit 37 includes a fixed plate 25, which is fixed to the top of the main frame 1. A drive sprocket seat 21 is fixed to each end of the fixed plate 25. A walking reducer 24 is fixed to the middle of the fixed plate 25. A drive shaft 22 extends from each of the two ends of the walking reducer 24, and is coaxially fixed to the drive sprocket within the drive sprocket seat 21. A walking motor 23 is also fixed to the input end of the walking reducer 24, and the motor shaft of the walking motor 23 is coaxially fixed to the input shaft of the walking reducer 24.

[0037] A buffer seat 26 is also fixed to the surface of the fixed plate 25, and the buffer seat 26 is located on both sides of the travel reducer 24. A buffer pad is provided at the end of the buffer seat 26 facing the hoisting unit 4 to buffer the hoisting unit 4. A buffer seat 26 with the same structure is also provided at one end of the driven sprocket seat 11 on the surface of the main frame 1.

[0038] like Figure 7 As shown, the high-temperature testing unit 8 includes a hot water tank 27, which has an open top. An openable cover 35 is arranged on each side of the hot water tank 27. Each cover 35 is opened and closed via a set of cover drive mechanisms.

[0039] The cover plate driving mechanism includes a cylinder mounting base 29 fixed to the bottom of the outer side of the hot water tank 27. The cylinder body of the driving cylinder 30 is fixed to the surface of the cylinder mounting base 29. A hinge seat 31, corresponding vertically to the cylinder mounting base 29, is fixed to the upper edge of the hot water tank 27. A hinge plate 33 is hinged to the upper end of the hinge seat 31. The outer end of the hinge plate 33 is hinged to the end of the piston rod of the driving cylinder 30, and the inner side of the hinge plate 33 is fixed to the surface of the cover plate 35. When the piston rod of the driving cylinder 30 moves, it drives the cover plate 35 to open and close through the hinge plate 33. The driving cylinder 30 can also be implemented by a hydraulic cylinder.

[0040] A clearance groove 34 is also provided on the surface of each cover plate 35, extending outward from the inner edge of the cover plate 35. The four clearance grooves 34, arranged opposite each other on two cover plates 35, correspond to the four steel cables 19 led down from the lifting unit 4, allowing the cover plates 35 to be opened freely when the hanger 6 is pulled by the steel cables 19 during testing in the hot water tank 27. A sensor 32 is also provided on the side of the hot water tank 27. Multiple sensors 32 can be provided, including but not limited to temperature sensors and liquid level sensors known in the art. The same sensor 32 is also provided on the side of the cold water tank of the low-temperature testing unit 9. A heater 28 is also provided at the bottom of the hot water tank 27 to bring the water in the hot water tank 27 to a preset temperature.

[0041] A steam outlet is provided on the surface of one of the cover plates 35. An exhaust pipe 3 is fixed to the upper edge of the corresponding side of the main frame 1 by a fixing bracket 36. The exhaust pipe 3 is connected to the steam outlet by a hose so that steam can be drawn out when high temperature testing is carried out in the hot water tank 27, thereby minimizing the impact of steam on the hoisting unit 4.

[0042] The specific working process and working principle are as follows:

[0043] The steel cables 19 led out from the hoisting unit 4 are fixed at the four corners of the hanger 6, and the insulator 7 to be tested is placed inside the hanger 6. After the test begins, the hoisting motor 14 operates, driving the roller 20 to rotate through the hoisting reducer 12. By arranging the winding direction of each steel cable 19, the four steel cables 19 can be raised and lowered synchronously when the roller 20 rotates.

[0044] After hoisting the hanger 6 containing the insulator 7 to be tested, the hoisting unit 4 places the hanger 6 into the low-temperature test unit 9 and the high-temperature test unit 8 according to the test requirements and in a specific time and sequence. During the test, temperature and level sensors located on the surfaces of the hot water tank 27 and the cold water tank ensure that the temperature and liquid level in both tanks meet the test requirements. After the insulator 7 has completed the corresponding hot and cold cycles according to the test requirements, the hoisting unit 4 places the hanger 6 back into the starting position 5 to complete the hot and cold cycle test.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. An insulator thermal cycling test device, comprising a main frame (1), a high-temperature test unit (8) and a low-temperature test unit (9) arranged side by side within the main frame (1), a hanger (6) for placing the insulator (7) to be tested is also provided within the main frame (1), and a hoisting unit (4) is movably provided on the top of the main frame (1), the hoisting unit (4) being connected to the hanger (6) via a flexible connector and used to drive the hanger (6) to rise, fall and move horizontally, characterized in that: The flexible connectors extending from the hoisting unit (4) include at least three lines, and the lines connecting any three connection points between the flexible connectors and the hanger (6) form a unique plane.

2. The insulator thermal cycling test apparatus according to claim 1, characterized in that: The hoisting unit (4) includes a traveling frame (18), on which a roller (20) is rotatably mounted. The flexible connector is a number of steel cables (19) wound around the surface of the roller (20). Guide components corresponding to the steel cables (19) are arranged around the roller (20). The steel cables (19) pass through the guide components and extend downward to the hoist (6).

3. The insulator thermal cycling test apparatus according to claim 2, characterized in that: The guiding assembly includes a guide plate (15) fixed to the surface of the walking frame (18), at least one guide frame (13) is provided on the surface of the guide plate (15), and a guide wheel is provided at the end of the guide frame (13) to realize the change of direction of the steel cable (19).

4. The insulator thermal cycling test apparatus according to claim 1, characterized in that: A sprocket and chain mechanism for moving the hoisting unit (4) is provided at the top of the main frame (1), and the hoisting unit (4) is fixed to the transmission chain (2) in the sprocket and chain mechanism.

5. The insulator thermal cycling test apparatus according to claim 1, characterized in that: The high temperature test unit (8) includes a hot water tank (27), at least one cover plate (35) is provided at the upper port of the hot water tank (27), and a cover plate drive mechanism is provided on the side of the hot water tank (27) to realize the opening and closing of each cover plate (35).

6. The insulator thermal cycling test apparatus according to claim 5, characterized in that: A relief groove (34) corresponding to the flexible connector is provided on the surface of the cover plate (35).

7. The insulator thermal cycling test apparatus according to claim 5, characterized in that: A steam outlet is provided on the surface of the cover plate (35), and the steam outlet is connected to the exhaust pipe (3) fixed at the main frame (1) through a pipeline.

8. The insulator thermal cycling test apparatus according to claim 1, characterized in that: Several position sensors for detecting the position of the hoisting unit (4) are also provided on the top of the main frame (1). The position sensors are arranged along the travel route of the hoisting unit (4). A trigger rod (16) for triggering the position sensor is provided on the side of the hoisting unit (4).

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