Electromechanical damp-heat comprehensive test device for composite insulator

Abstract

The utility model discloses an electromechanical damp-heat comprehensive test device for a composite insulator, and belongs to the technical field of insulator aging tests. Which comprises an environment box (5) in which an insulator (8) to be tested is arranged and a servo electric cylinder (13) for applying push-pull force to the insulator to be tested, and is characterized in that a driving assembly (2) is arranged outside the environment box (5), the servo electric cylinder (13) is mounted in the driving assembly (2), a driving frame (22) is arranged at the end part of a piston rod of the servo electric cylinder (13), a limiting guide mechanism is arranged in the driving assembly (2), and the servo electric cylinder (13) is mounted in the driving frame (22). The driving frame (22) is connected with the limiting guide mechanism; and a driving rod (20) is led out from the end part of the driving frame (22) and is connected with an insulator (8) to be tested. According to the electromechanical damp-heat comprehensive test device for the composite insulator, the limiting guide mechanism is arranged, so that the bending of the piston rod of the servo electric cylinder caused by radial force generated after the to-be-tested insulator is bent is avoided while the driving rod is guided.

Description

Technical Field

[0001] A composite insulator electro-mechanical and hygrothermal comprehensive test device belongs to the technical field of insulator aging tests. Background Art

[0002] As an important support for the national economy, maintaining the stable operation of the power system is an important task. Composite insulators have the advantages of light weight, dirt resistance, easy installation, etc., and have been widely used in China's power grid at present. However, composite insulators are mainly made of organic materials. During use, in addition to tensile loads, they will also be subjected to bending stresses exerted by wind and ice. This long-term bending stress will inevitably cause the composite insulators to age, affecting the safe operation of the power grid. Existing composite insulator aging tests only consider mechanical effects and cannot simulate their actual operating conditions.

[0003] A Chinese invention patent with the application number 202210721356.9, the application date of June 24, 2022, and the patent name of "A multi-factor composite insulator aging test platform for humidity-electricity-alternating load" discloses a technical solution. In this technical solution, the temperature and humidity control module is used to adjust the temperature and humidity environment in the test chamber, the voltage loading module starts to provide a high-voltage environment, and the alternating load application module drives the composite insulator to move reciprocally to simulate the actual force-bearing process of the composite insulator under multi-factor environmental conditions such as high voltage and various temperatures and humidities. The performance of the composite insulator is tested by recording the instantaneous fracture value and buckling times of the composite insulator.

[0004] In this technical solution, the piston rod of the servo cylinder is directly loaded on the composite insulator to be tested to apply a pushing and pulling force to the composite insulator. However, it is found that there are the following defects in the specific test of this connection method: Since the composite insulator will undergo a certain degree of bending deformation after receiving the pushing and pulling force (especially the thrust), and the bending direction is not determined, this will cause the piston rod of the servo cylinder to bear not only the axial force but also a certain degree of radial force. After long-term use, the piston rod of the servo cylinder will be deformed. When the deformation reaches a certain degree, the servo cylinder cannot be used again, resulting in a significant increase in the test cost. Utility Model Content

[0005] The technical problem to be solved by the present utility model is to overcome the deficiencies of the prior art and provide a composite insulator electro-mechanical and hygrothermal comprehensive test device that, by setting a limit guiding mechanism, while guiding the driving rod, avoids the bending of the piston rod of the servo cylinder caused by the radial force generated after the insulator to be tested is bent.

[0006] The technical solution adopted by the present utility model to solve its technical problems is as follows: This composite insulator electro-mechanical and hygrothermal comprehensive test device includes an environmental chamber with adjustable internal temperature and humidity. The insulator to be tested is placed inside the environmental chamber. There is a servo electric cylinder, and the piston rod of the servo electric cylinder is connected to the insulator to be tested and applies a pushing and pulling force to the insulator to be tested. Its characteristics are: A driving component is arranged outside the environmental chamber, the servo electric cylinder is installed inside the driving component, a driving frame is arranged at the end of the piston rod of the servo electric cylinder, a limiting and guiding mechanism is arranged inside the driving component, the driving frame is connected to the limiting and guiding mechanism, and a driving rod is led out from the end of the driving frame and connected to the insulator to be tested.

[0007] Preferably, the driving component includes a main frame. A support arm and a track arm are horizontally arranged at the top of the main frame. The servo electric cylinder is fixed below the support arm. The limiting and guiding mechanism includes a track mechanism arranged at the bottom of the track arm, and the driving frame is clamped and connected to the track mechanism.

[0008] Preferably, the track mechanism includes a track arranged at the bottom of the track arm and a slider clamped to the track. The slider is fixed at the top of the driving frame.

[0009] Preferably, the limiting and guiding mechanism further includes a guiding rod fixed to the end face of the driving frame. The guiding rod is arranged parallel to the piston rod of the servo electric cylinder, and the guiding rod passes through a guiding hole on the main frame.

[0010] Preferably, the driving component further includes a sub-frame integrally arranged with the main frame. The sub-frame is located on the side of the main frame close to the environmental chamber. A guiding block is arranged at the top of the sub-frame, and the driving rod passes through the guiding block.

[0011] Preferably, an auxiliary seat is further arranged on the side of the environmental chamber facing away from the driving component. An auxiliary rod is led out from the auxiliary seat, and the auxiliary rod enters the environmental chamber and is connected to the other end of the insulator to be tested.

[0012] Preferably, the auxiliary rod and the insulator to be tested are connected by an insulating connecting piece.

[0013] Preferably, there is a chassis, and the driving component, the environmental chamber, and the auxiliary seat are sequentially fixed on the surface of the chassis.

[0014] Preferably, an insulating rod is also erected outside the chassis. An external high-voltage cable is laid on the top of the insulating rod, passes through a wall-piercing bushing at the top of the environmental chamber, and then enters the environmental chamber and is connected to the insulator to be tested.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] In this composite insulator electro-mechanical and hygrothermal comprehensive test device, by setting the limiting and guiding mechanism, while guiding the driving rod, it avoids the bending of the piston rod of the servo electric cylinder caused by the radial force generated after the insulator to be tested is bent.

[0017] In the electromechanical and hygrothermal comprehensive test device for composite insulators, the high-voltage cable introduced from the far end is erected on the top of the insulating rod and then enters the environmental chamber through the wall-penetrating bushing, avoiding the contact between the high-voltage cable and the housing of the environmental chamber and other metal components in this test device to prevent danger.

[0018] The insulator under test is connected to the auxiliary rod through an insulating connector, and one end of the insulator under test connected to the driving rod is grounded through a wire. To prevent the insulation test performance of the insulator under test from degrading during the test and to avoid danger caused by introducing the high-voltage power supply through the driving assembly or the auxiliary seat. Brief Description of the Drawings

[0019] Figure 1 It is the front view of the electromechanical and hygrothermal comprehensive test device for composite insulators.

[0020] Figure 2 is Figure 1 the top view of

[0021] Figure 3 is Figure 1 the schematic diagram after omitting the environmental chamber and the equipment box in

[0022] Figure 4 It is the front view of the driving assembly of the electromechanical and hygrothermal comprehensive test device for composite insulators.

[0023] Figure 5 is Figure 4 the sectional view taken along the A-A direction in

[0024] Wherein: 1. Insulating rod; 2. Driving assembly; 3. Fan; 4. Wall-penetrating bushing; 5. Environmental chamber; 6. Auxiliary rod; 7. Auxiliary seat; 8. Insulator under test; 9. Insulating connector; 10. Insulating rod base; 11. Equipment box; 12. Support arm; 13. Servo electric cylinder; 14. Main frame; 15. Guide rod; 16. Dynamic force sensor; 17. Track arm; 18. Track mechanism; 19. Guide block; 20. Driving rod; 21. Sub-frame; 22. Driving frame. Detailed Embodiment

[0025] Figures 1 to 5 is the best embodiment of the present utility model. The following further describes the present utility model in conjunction with the attached Figures 1 to 5 drawings.

[0026] As Figures 1 to 2 shown, an electromechanical and hygrothermal comprehensive test device for composite insulators (hereinafter referred to as the test device) includes a chassis. An environmental chamber 5 is fixed on the surface of the chassis. A driving assembly 2 and an auxiliary seat 7 are respectively arranged on both sides of the environmental chamber 5, and the driving assembly 2 and the auxiliary seat 7 are simultaneously fixed on the surface of the chassis.

[0027] Combined withFigure 3 , the insulator under test 8 to be tested is located inside the environmental chamber 5. A driving rod 20 (see Figure 4 ) and an auxiliary rod 6 are respectively led out from the self-driving assembly 2 and the auxiliary seat 7. The driving rod 20 and the auxiliary rod 6 are coaxially fixed at both ends of the insulator under test 8 respectively, and a pushing and pulling force is applied to the insulator under test 8 through the driving rod 20.

[0028] An equipment box 11 is closely arranged at the rear side of the environmental chamber 5. The equipment box 11 and the environmental chamber 5 share a box wall. An electric heater, a humidifying device, etc. are arranged inside the environmental chamber 5 to make the inside of the environmental chamber 5 at a preset test temperature and test humidity. The heater and the humidifying device are both realized by common knowledge in the art and will not be elaborated here.

[0029] A plurality of blowers 3 are arranged side by side at the rear side of the top of the environmental chamber 5. A through hole is arranged at the front side of the top of the environmental chamber 5, and a wall bushing 4 is arranged at the through hole. The wall bushing 4 faces downward directly to the insulator under test 8 inside the environmental chamber 5. The high-voltage cable introduced from the far end passes through the wall bushing 4 and then is introduced into the environmental chamber 5 and is connected to the insulator under test 8 to apply a high-voltage power supply to the insulator under test 8 during the test process.

[0030] An insulating rod base 10 is arranged at the rear side of the chassis. An insulating rod 1 is erected on the surface of the insulating rod base 10. The wall bushing 4 is made of insulating material. The high-voltage cable introduced from the far end is laid on the top of the insulating rod 1 and then enters the environmental chamber 5 through the wall bushing 4, avoiding the high-voltage cable from contacting the box body of the environmental chamber 5 and other metal parts in this test device and causing danger. Inside the environmental chamber 5, the insulator under test 8 is connected to the auxiliary rod 6 through an insulating connector 9, and one end of the insulator under test 8 connected to the driving rod 20 is grounded through a wire. To avoid the insulation test performance of the insulator under test 8 from decreasing during the test, and introducing the high-voltage power supply into this test device through the driving assembly 2 or the auxiliary seat 7, which may cause danger.

[0031] Combined with Figures 4 to 5 , the driving assembly 2 includes a main frame 14. The main frame 14 is vertically fixed on the surface of the chassis. A sub-frame 21 is arranged on one side of the main frame 14 close to the environmental chamber 5. The sub-frame 21 is integrally arranged with the main frame 14, and the height of the sub-frame 21 is lower than the height of the main frame 14. Fixing plates ( Figure 4 omitted in the figure) are arranged around the main frame 14. A support arm 12 and a track arm 17 are horizontally arranged at the top of the main frame 4. The support arm 12 extends away from the environmental chamber 5, and the track arm 17 extends towards the environmental chamber 5. The track arm 17 is fixed on the surface of the fixing plate on the side of the main frame 14 close to the environmental chamber 5. After passing through the main frame 14, the support arm 12 is fixed on the other surface of the fixing plate on the side of the main frame 14 close to the environmental chamber 5.

[0032] At the bottom of the rail arm 17, a rail mechanism 18 is arranged. The rail mechanism 18 is arranged directly above the auxiliary frame 21. At the bottom of the support arm 12, a servo electric cylinder 13 is provided. The servo electric cylinder 13 extends along the arrangement direction of the support arm 12, passes through the main frame 14 and extends to the fixing position of the support arm 12 and the side fixing plate of the main frame 14. The servo electric cylinder 13 is realized by using a commercially available common product, including a servo motor, a reducer and a cylinder block. Its specific structure and working principle will not be elaborated here.

[0033] The piston rod of the servo electric cylinder 13 penetrates through the fixing plate on the side of the main frame 14 and extends to the outside of the main frame 14. On the outside of the main frame 14, a driving frame 22 is provided. The piston rod of the servo electric cylinder 13 is fixed on the end face of the driving frame 22 facing away from the environmental chamber 5. The above-mentioned rail mechanism 18 includes a rail and a slider slidably connected to the rail. Among them, the rail in the rail assembly 18 is arranged at the bottom of the rail frame 17, and the slider is fixed on the top of the driving frame 22. A dynamic force sensor 16 is fixed on the end face of the driving frame 22 facing the environmental chamber 5. One end of the above-mentioned driving rod 20 is fixed to the sensing end of the dynamic force sensor 16, and the other end extends into the environmental chamber 5 and is connected to the insulator 8 to be measured.

[0034] A guide block 19 is provided at the top of the auxiliary frame 21 near one end of the environmental chamber 5. The driving rod 20 passes through the guide block 19 before entering the environmental chamber 5. On the end face of the driving frame 22 facing away from the environmental chamber 5, two guide rods 15 are arranged side by side. The two guide rods 15 are respectively located on the front and back sides of the piston rod of the servo electric cylinder 13. On the two fixing plates of the main frame 14 facing and facing away from the environmental chamber 5, a set of guide holes are respectively provided. The two guide rods 15 respectively pass through the two corresponding guide holes of the two fixing plates and extend towards the end of the support arm 12.

[0035] The specific working process and working principle are as follows:

[0036] After the staff opens the door of the environmental chamber 5, the insulator 8 to be measured is installed between the driving rod 20 and the insulating connector 9. After closing the door of the environmental chamber 5, the test on the insulator 8 to be measured is started.

[0037] During the test, the heating device and the humidifying device in the equipment box 11 are controlled by a console (not shown in the figure) outside the experimental device, and according to the preset test conditions, the preset test temperature and test humidity are achieved in the environmental chamber 5. Then the servo electric cylinder 13 operates, and after its piston rod outputs, it drives the driving rod 20 to act through the driving frame 22, applying a thrust to the insulator under test 8, causing the insulator under test 8 to generate a predetermined compression amount. Then the servo electric cylinder 13 drives the driving frame 22 to move in the reverse direction and reset. At this time, a pulling force is applied to the insulator under test 8 through the driving rod 20, and a predetermined number of push-pull cycles are repeatedly applied to the insulator under test 8. During the whole process, the dynamic force sensor 16 measures the value of each push-pull cycle. During the test process, a high-voltage electric is applied to the insulator under test 8 through an external high-voltage cable to test the insulation characteristics of the insulator under test 8 in a humid and hot environment and during the repeated push-pull process.

[0038] And as can be seen from the above, while the driving assembly 2 repeatedly applies push-pull forces to the insulator under test 8, especially when applying the thrust, the thrust output by the piston rod of the servo electric cylinder 13 is applied to the insulator under test 8 through the driving frame 22 and the driving rod 20. If the insulator under test 8 bends or is in other states when receiving the thrust and generates a radial force by itself, the radial force generated by the insulator under test 8 is applied to the driving rod 20 and further applied to the driving frame 22 by the driving rod 20. At this time, under the limiting action of the track mechanism 18 and the guide rod 15 of the driving frame 22, the radial force will not be further transmitted to the piston rod of the servo electric cylinder 13, and the piston rod of the servo electric cylinder 13 only bears the axial force sent by the driving frame 22. Therefore, the piston rod of the servo electric cylinder 13 is prevented from bending and being damaged.

[0039] The above is only a preferred embodiment of the present invention and is not a limitation to the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A composite insulator electromechanical wet heat comprehensive test device, comprising an environmental box (5) with adjustable internal temperature and humidity, an insulator to be tested (8) is placed in the environmental box (5), a servo electric cylinder (13) is provided, a piston rod of the servo electric cylinder (13) is connected to the insulator to be tested (8), and a push-pull force is applied to the insulator to be tested, characterized in that: A drive assembly (2) is arranged outside the environmental chamber (5), a servo electric cylinder (13) is installed inside the drive assembly (2), a drive frame (22) is arranged at the end of a piston rod of the servo electric cylinder (13), a limit guide mechanism is arranged inside the drive assembly (2), the drive frame (22) is connected to the limit guide mechanism, and a drive rod (20) is led out from the end of the drive frame (22) and connected to an insulator (8) to be tested.

2. The electromechanical damp-heat comprehensive test device for composite insulators according to claim 1 is characterized in that: The drive assembly (2) comprises a main frame (14), a support arm (12) and a track arm (17) are horizontally arranged on the top of the main frame (14), a servo electric cylinder (13) is fixed below the support arm (12), a position limiting guide mechanism comprises a track mechanism (18) arranged at the bottom of the track arm (17), and a drive frame (22) is connected to the track mechanism (18) by clamping.

3. The electromechanical damp-heat comprehensive test device for composite insulators according to claim 2 is characterized in that: The track mechanism (18) comprises a track arranged at the bottom of the track arm (17) and a slider clamped with the track, wherein the slider is fixed on the top of the driving frame (22).

4. The electromechanical damp-heat comprehensive test device for composite insulators according to claim 2 is characterized in that: The position limiting guide mechanism also includes a guide rod (15) fixed to the end surface of the driving frame (22), the guide rod (15) being arranged parallel to the piston rod of the servo electric cylinder (13), and the guide rod (15) passing through a guide hole on the main frame (14).

5. The electromechanical damp-heat comprehensive test device for composite insulators according to claim 2 is characterized in that: The driving assembly (2) further comprises a sub-frame (21) integrally arranged with the main frame (14); the sub-frame (21) is located on a side of the main frame (14) close to the environmental chamber (5); a guide block (19) is arranged on the top of the sub-frame (21); and the driving rod (20) passes through the guide block (19).

6. The electromechanical and thermal comprehensive test device for composite insulators according to claim 1 is characterized in that: An auxiliary seat (7) is also provided on the side of the environmental box (5) facing away from the drive assembly (2), and an auxiliary rod (6) is led out from the auxiliary seat (7). The auxiliary rod (6) enters the environmental box (5) and is connected to the other end of the insulator (8) to be tested.

7. The electromechanical damp-heat comprehensive test device for composite insulators according to claim 6 is characterized in that: The auxiliary rod (6) and the insulator to be tested (8) are connected via an insulating connector (9); and the connection between the insulator to be tested (8) and the driving rod (20) is grounded.

8. The electromechanical damp-heat comprehensive test device for composite insulators according to claim 6 is characterized in that: A base frame is provided, and the drive assembly (2), the environmental chamber (5) and the auxiliary seat (7) are fixed in sequence on the surface of the base frame.

9. The composite insulator electromechanical damp-heat comprehensive test device according to claim 8, characterized in that: An insulating rod (1) is also erected on the outside of the base frame. The external high-voltage cable is laid on the top of the insulating rod (1), passes through a wall bushing (4) on the top of the environmental chamber (5), enters the environmental chamber (5), and is connected to the insulator (8) to be tested.

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