A on-load oil switch maintenance equipment for transformers

Abstract

The present invention discloses an on-load oil switch maintenance equipment for a transformer, which includes a vehicle body and an oil storage device, a cleaning device, a spraying device and a hoisting device arranged on the vehicle body. The oil storage device includes a qualified oil storage tank, a cleaning oil temporary storage tank and a waste oil barrel. By arranging the oil storage device, the cleaning device, the spraying device and the hoisting device on the vehicle body, the present invention makes each device form an interconnected whole, and through the movement of the vehicle body, realizes the movement of the whole of each device, with convenient and fast operation. It realizes the storage of new oil, cleaning oil and waste oil of the transformer, facilitates the quick oil discharge and oil injection operations, and through the action of the spraying device and the cleaning device, cleans the switch, increasing the safety of maintenance.

Description

Technical Field:

[0002] The present invention relates to the field of power supply and transformation maintenance, and particularly to a maintenance device for a on-load oil switch of a transformer. Background Art:

[0004] After a on-load oil switch of a transformer has been used for a certain number of years, it needs to be maintained. The existing maintenance method is to lift down the on-load oil switch and then replace the oil inside the on-load oil switch. The waste oil replaced needs to be stored in a place. After cleaning the on-load oil switch, new oil needs to be filled, and then it is lifted back to its original position. However, during the operation process, the discharge of waste oil, the filling of new oil, and the cleaning are all carried out using different devices, but these devices are all independent of each other. At the same time, the equipment is relatively heavy, and the distance between the maintenance location and the transportation location is relatively far. Especially during the operation of waste oil and new oil, it is necessary to store and transfer the oil liquid, and the operation is troublesome. Summary of the Invention:

[0006] The technical problem to be solved by the present invention is: the problem that the existing devices are independent of each other and inconvenient to transport.

[0007] To solve the above technical problem, a technical solution provided by the present invention is: a maintenance device for a on-load oil switch of a transformer, including a vehicle body and an oil storage device, a cleaning device, a spraying device, and a lifting device provided on the vehicle body. The characteristics are: the oil storage device includes a qualified oil product storage tank, a cleaning oil temporary storage tank, and a waste oil barrel. The oil outlet of the qualified oil product storage tank is communicated with one end of a first valve. The other end of the first valve is communicated with one end of a second valve and one end of a first filter. The other end of the first filter is communicated with the inlet of a first gear oil pump. The outlet of the first gear oil pump is communicated with the inlet of a three-way valve. One outlet of the three-way valve is communicated with the oil inlet of the qualified oil product storage tank;

[0008] The oil outlet of the qualified oil product storage tank is communicated with one end of a fourth valve. The other end of the fourth valve is communicated with the cleaning oil temporary storage tank. The oil inlet of the cleaning oil temporary storage tank is communicated with one end of an oil and gas filtering device. The other end of the oil and gas filtering device is communicated with one end of a sixth valve. The other end of the sixth valve is communicated with the air inlet of an air pump. The air outlet of the air pump is communicated with one end of an eighth valve and a ninth valve. The other end of the eighth valve is communicated with the oil outlet of the qualified oil product storage tank;

[0009] The other end of the fourth valve communicates with one end of the fifth valve, the other end of the fifth valve communicates with the spraying device, the spraying device is arranged above the cleaning device, the cleaning device communicates with one end of the tenth valve, the other end of the tenth valve communicates with one end of the second filter and one end of the eleventh valve, the other end of the eleventh valve is the waste oil pumping port, the other end of the second filter communicates with the inlet of the second gear oil pump, the outlet of the second gear oil pump communicates with the waste oil barrel, the waste oil barrel communicates with one end of the third manual valve, and the other end of the third manual valve communicates with one end of the second filter.

[0010] Further, the other end of the fourth valve extends to the bottom of the cleaning oil storage tank through a pipeline. A liquid level switch is arranged in the cleaning oil storage tank, and the liquid level switch is electrically linked with the air pump. A pressure gauge is arranged on the cleaning oil storage tank.

[0011] Further, the air inlet of the air pump communicates with one end of the first valve, the other end of the seventh valve communicates with the air outlet of the dryer, and a detachable filter screen is arranged at the air inlet of the dryer.

[0012] Further, a liquid level gauge is arranged on the qualified oil storage tank.

[0013] Further, the cleaning device includes a cleaning pool and a cleaning table. The cleaning table is placed in the cleaning pool, and the bottom of the cleaning pool communicates with one end of the tenth valve.

[0014] Further, a first manual valve is arranged at the other end of the fifth valve, and a second manual valve is arranged on the paint filter.

[0015] Further, a lifting ring is arranged on the vehicle body. A driving motor and a battery are arranged inside the vehicle body. The driving motor is connected to the wheels through a transmission, and the battery supplies power to the driving motor through a control switch.

[0016] Further, the lifting device includes a support arm, a lifting arm and a driving oil cylinder. One end of the support arm is rotatably arranged on the vehicle body, the other end of the support arm is hinged to the support arm, and both ends of the driving oil cylinder are respectively hinged to the support arm and the lifting arm.

[0017] Further, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve and the eleventh valve are all electric valves, and are all connected to a controller and powered by the battery. The air pump, the first gear oil pump, the second gear oil pump and the cleaning device are all connected to the controller and powered by the battery.

[0018] The beneficial effects of the present invention are:

[0019] By arranging an oil storage device, a cleaning device, a spraying device and a hoisting device on the vehicle body, the devices are formed into an interconnected whole, and through the movement of the vehicle body, the whole of each device can be moved, which is convenient and fast to operate. It can store new oil, cleaning oil and waste oil of the transformer, facilitate the quick oil discharge and oil injection operations, and through the action of the spraying device and the cleaning device, clean the switch to increase the safety of maintenance.

[0020] In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Brief Description of the Drawings:

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the following drawings are only two of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a structural schematic diagram of the present application.

[0024] Figure 2 It is a connection diagram of each device.

[0025] In the figure, 1 - vehicle body, 2 - cleaning device, 3 - spraying device, 4 - hoisting device, 5 - qualified oil storage tank, 6 - cleaning oil temporary storage tank, 7 - waste oil barrel, 8 - filter screen, 9 - dryer, 10 - liquid level switch, 11 - pressure gauge, 12 - liquid level gauge, 13 - lifting ring; 21 - cleaning pool, 22 - cleaning table; GL1 - first filter, GL2 - second filter, GL3 - oil and gas filtering device; YB1 - first gear oil pump, YB2 - second gear oil pump, YB3 - air pump; V1 - first valve, V2 - second valve, V3 - three-way valve, V4 - fourth valve, V5 - fifth valve, V6 - sixth valve, V7 - seventh valve, V8 - eighth valve, V9 - ninth valve, V10 - tenth valve, V11 - eleventh valve; VT1 - first manual valve, VT2 - second manual valve, VT3 - third manual valve. Detailed Description of the Embodiment:

[0027] The following will describe the embodiments of the present invention in more detail with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0028] It should be understood that the various steps described in the method embodiments of the present invention can be executed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this regard.

[0029] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are for illustrative purposes only and are not used to limit the scope of these messages or information.

[0030] Embodiment 1

[0031] As Figure 1 - Figure 2 shown, an on-load oil switch maintenance device for a transformer includes a vehicle body 1 and an oil storage device, a cleaning device 2, a spraying device 3, and a hoisting device 4 provided on the vehicle body 1. The oil storage device includes a qualified oil storage tank 5, a cleaning oil temporary storage tank 6, and a waste oil barrel 7. The parameters of the qualified oil storage tank 5, the cleaning oil temporary storage tank 6, and the waste oil barrel 7 are: carbon steel; wall thickness 3 mm; three-layer internal painting (bottom layer, middle layer, surface layer, oil-resistant and electrostatic conductive paint, meeting the requirements of DL / T 1552-2016 "Transformer Oil Storage Management Guidelines"). The qualified oil storage tank 5 can hold 500 kg of new transformer oil, and the waste oil barrel 7 can hold 300 kg of waste transformer oil. The oil outlet of the qualified oil storage tank 5 is connected to one end of a first valve V1, and the other end of the first valve V1 is connected to one end of a second valve V2 and one end of a first filter GL1. The other end of the first filter GL1 is connected to the inlet of a first gear oil pump YB1. The oil pumping and injecting speed of the first gear oil pump YB1 is 45 L / min, and the output height is 10 m. The outlet of the first gear oil pump YB1 is connected to the inlet of a three-way valve, and one outlet of the three-way valve is connected to the oil inlet of the qualified oil storage tank 5.

[0032] In this embodiment, the oil outlet of the qualified oil storage tank 5 is connected to one end of a fourth valve V4, and the other end of the fourth valve V4 is connected to the cleaning oil temporary storage tank 6. The oil inlet of the cleaning oil temporary storage tank 6 is connected to one end of an oil and gas filtering device GL3, and the other end of the oil and gas filtering device GL3 is connected to one end of a sixth valve V6. The other end of the sixth valve V6 is connected to the air inlet of an air pump YB3. The air outlet of the air pump YB3 is connected to one end of an eighth valve V8 and a ninth valve V7. The other end of the eighth valve V8 is connected to the oil outlet of the qualified oil storage tank 5;

[0033] In this embodiment, the other end of the fourth valve V4 communicates with one end of the fifth valve V5, and the other end of the fifth valve V5 communicates with the spraying device 3, which is connected by an external quick-connect fitting. The spraying device 3 is a spray head with a spraying aperture of 5.2 mm and a flow rate of 11.6 L / min under one atmospheric pressure. The spraying shape and flow rate can be manually adjusted through the first manual valve VT1. The spraying joint is connected to the output interface through a self-sealing quick-connect, and the output port can also be replaced to complete outputs for different purposes. The spraying device 3 is arranged above the cleaning device 2. The cleaning device 2 communicates with one end of the tenth valve V10, and the other end of the tenth valve V10 communicates with one end of the second filter GL2 and one end of the eleventh valve V11. The other end of the eleventh valve V11 is the waste oil pumping port. The other end of the second filter GL2 communicates with the inlet of the second gear oil pump YB2. The pumping and injecting speed of the second gear oil pump YB2 is 45 L / min, and the output height is 10 meters. The outlet of the second gear oil pump YB2 communicates with the waste oil barrel 7. The waste oil barrel 7 communicates with one end of the third manual valve VT3, and the other end of the third manual valve VT3 communicates with one end of the second filter GL2.

[0034] In this embodiment, the inlet of the air pump YB3 communicates with one end of the first valve V1, and the other end of the seventh valve V7 communicates with the outlet of the dryer 9. A detachable filter screen 8 is provided at the inlet of the dryer 9 to filter the air inhaled by the air pump YB3. At the same time, the filter screen 8 can block large particles and is detachably arranged for easy replacement.

[0035] In this embodiment, the cleaning device 2 includes a cleaning pool 21 and a cleaning table 22. The cleaning table 22 is placed in the cleaning pool 21, and the bottom of the cleaning pool 21 communicates with one end of the tenth valve V10. The cleaning pool 21 is an ultrasonic cleaning pool 21. It mainly converts the sound energy of the power ultrasonic frequency source into mechanical vibration through a transducer, and radiates the ultrasonic wave to the cleaning liquid in the tank through the cleaning tank wall. Due to the radiation of the ultrasonic wave, the microbubbles in the liquid in the tank can maintain vibration under the action of the sound wave. It destroys the adsorption between the dirt and the surface of the cleaning part, causes the fatigue failure of the dirt layer and is peeled off, and the vibration of the gas-type bubbles scrubs the solid surface. When the sound pressure or sound intensity reaches a certain level under pressure, the bubbles will expand rapidly and then suddenly close. During this process, a shock wave is generated at the moment when the bubbles close, generating a pressure of 1012 - 1013 pa and local temperature adjustment around the bubbles. The huge pressure generated by this ultrasonic cavitation can destroy insoluble dirt and make them dissolve in the solution, and the steam-type cavitation directly impacts the dirt repeatedly.

[0036] On the one hand, it destroys the adsorption between the dirt and the surface of the cleaning part. On the other hand, it can cause the fatigue failure of the dirt layer and make it peeled off. The vibration of gas-type bubbles scrubs the solid surface. Once there is a gap in the dirt layer, the bubbles will immediately "drill in" and the vibration makes the dirt layer fall off. Due to the cavitation effect, the two liquids are rapidly dispersed and emulsified at the interface. When solid particles are wrapped by oil and adhered to the surface of the cleaning part, the oil is emulsified and the solid particles fall off by themselves. When ultrasonic waves propagate in the cleaning liquid, positive and negative alternating sound pressures will be generated, forming a jet flow that impacts the cleaning part. At the same time, due to the nonlinear effect, acoustic streaming and micro-acoustic streaming will be generated. And ultrasonic cavitation will generate high-speed micro-jet flows at the solid-liquid interface. All these effects can destroy the dirt, remove or weaken the boundary dirt layer, increase the stirring and diffusion effects, accelerate the dissolution of soluble dirt, and strengthen the cleaning effect of chemical cleaning agents. Thus, it can be seen that wherever the liquid can reach and the sound field exists, there is a cleaning effect. Its characteristics are suitable for cleaning parts with very complex surface shapes. Especially after adopting this technology, the amount of chemical solvents can be reduced, thus greatly reducing environmental pollution.

[0037] When ultrasonic waves propagate in a liquid, the liquid and the cleaning tank vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequencies, and this vibration frequency is the sound wave frequency, so people can hear a buzzing sound. In addition, during the ultrasonic cleaning process, the bubbles visible to the naked eye are not vacuum nuclear group bubbles, but air bubbles, which have an inhibitory effect on the cavitation effect and reduce the cleaning efficiency. Only when the air bubbles in the liquid are completely removed can the vacuum nuclear group bubbles of the cavitation effect achieve the best effect.

[0038] In this embodiment, a first manual valve VT1 is provided at the other end of the fifth valve V5, and a second manual valve VT2 is provided on the paint filter. The first manual valve VT1 can manually adjust the spray flow rate, and the second manual valve VT2 realizes the discharge of waste oil in the waste oil barrel 7.

[0039] In this embodiment, the first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve V5, the sixth valve V6, the seventh valve V7, the eighth valve V8, the ninth valve V7, the tenth valve V10, and the eleventh valve V11 are all electric valves, and are all connected to the controller and powered by a battery. The air pump YB3, the first gear oil pump YB1, the second gear oil pump YB2, and the cleaning device 2 are all connected to the controller and powered by a battery.

[0040] In this embodiment, a lifting ring is provided on the vehicle body 1. A driving motor and a battery are arranged inside the vehicle body 1. The driving motor is connected to the wheels through a transmission. The battery supplies power to the driving motor through a control switch (not shown in the figure). The vehicle body 1 is lifted through the lifting ring. When the vehicle body 1 is unloaded from the transport vehicle to the ground, there is still a certain distance to the destination, and the equipment needs to be able to move to the destination by itself. The entire equipment with oil weighs about 2T. It is necessary to use an internally installed lithium iron phosphate battery to drive a hydraulic gear pump, which drives the crankshaft to move through a hydraulic motor. The specification model of the hydraulic gear pump is: YP100B3 / 5-72V5.0-3200, rated voltage DC72V, rated power 5KW, rotational speed 3200r / min, rated torque: 18.7 N.m. Moving distance: 2km, speed: 1.5m / s.

[0041] In this embodiment, the lifting device 4 includes a support arm, a lifting arm and a driving oil cylinder. One end of the support arm is rotatably arranged on the vehicle body 1. The other end of the support arm is hinged to the lifting arm. The two ends of the driving oil cylinder are respectively hinged to the support arm and the lifting arm. The driving oil cylinder is controlled through a lifting switch connected to the controller. The loaded oil switch is lifted through the interaction between the support arm, the lifting arm and the driving oil cylinder. And the lifting arm can lift a loaded oil switch within 300 kg. The support arm is rotatably arranged on the vehicle body 1, which is convenient for lifting the loaded oil switch.

[0042] In this embodiment, each valve is connected to each other, or each valve is connected to the qualified oil storage tank 5, the cleaning oil temporary storage tank 6, the waste oil barrel 7, the first gear oil pump YB1, the second gear oil pump YB2, the first filter GL1 and the second filter GL2 through DN13 nitrile rubber hoses and external quick connectors, which is convenient for quick disassembly between them.

[0043] During use, all valves are in the closed state. The vehicle body 1 is lifted from the transportation device through the lifting ring, and the vehicle body 1 moves to the construction position under the action of the hydraulic motor. It is connected to the on-load oil switch through the waste oil pumping port. After the eleventh valve V11 is opened, the second gear oil pump YB2 works to pump the waste oil in the on-load oil switch into the waste oil barrel 7 for storage. The on-load oil switch is hoisted onto the cleaning table 22 through the hoisting device 4. The seventh valve V7, the eighth valve V8, the fifth valve V5, and the first manual valve VT1 are opened, and the air pump YB3 works. The air entering from the dryer 9 enters the cleaning oil temporary storage tank 6 under the action of the air pump YB3. The pressure in the cleaning oil temporary storage tank 6 increases, and the cleaning oil in the cleaning oil temporary storage tank 6 is sprayed out from the nozzle after passing through the fifth valve V5 and the first manual valve VT1 to spray the on-load oil switch, and then ultrasonic cleaning is carried out. The waste oil after cleaning is stored in the cleaning pool 21. The tenth valve V10 and the second gear oil pump YB2 are opened to discharge the waste oil stored in the cleaning pool 21 into the waste oil barrel 7 for storage. The on-load oil switch is hoisted to the transformer installation position through the hoisting device 4. The oil outlet is connected to the on-load oil switch. The first valve V1, the first gear oil pump YB1, and the three-way valve are opened to fill the new oil stored in the qualified oil storage tank 5 into the on-load oil switch. After the maintenance is completed, the vehicle body 1 moves to the transportation device position, and the vehicle body 1 is hoisted onto the transportation device through the lifting ring.

[0044] Among them, when filling the new oil stored in the qualified oil storage tank 5, the oil inlet is connected to the new oil filling equipment. The second valve V2, the first gear oil pump YB1, and the three-way valve are opened. The new oil is filled into the qualified oil storage tank 5 through the second valve V2, the first filter GL1, the first gear oil pump YB1, and the three-way valve. The first filter GL1 filters the new oil filled into the on-load oil switch and the qualified oil storage tank 5 to ensure the quality of the oil.

[0045] Among them, when filling the cleaning oil in the cleaning oil temporary storage tank 6, the fourth valve V4, the sixth valve V6, the ninth valve V7, and the air pump YB3 are opened to extract the air in the cleaning oil temporary storage tank 6, so that the new oil in the qualified oil storage tank 5 flows into the cleaning oil temporary storage tank 6. The oil and gas filter filters the cleaning oil mixed in the air discharged from the cleaning oil temporary storage tank 6, and the filtered cleaning oil is discharged from the second manual valve VT2.

[0046] Among them, for the waste oil stored in the waste oil barrel 7, by opening the third manual valve VT3 and the eleventh valve V11, the waste oil is discharged from the waste oil pumping port.

[0047] Embodiment 2

[0048] Such as Figure 2As shown, this embodiment is obtained by changing the connection method of technical features such as the end and the terminal board 2 on the basis of Embodiment 1. The remaining technical features are the same as those in Embodiment 1, and the same parts will not be elaborated here. The differences between this embodiment and Embodiment 1 are as follows: The other end of the fourth valve V4 extends to the bottom of the cleaning oil storage tank 6 through a pipeline. A liquid level switch 10 is arranged in the cleaning oil storage tank 6. The liquid level switch 10 is electrically interlocked with the air pump YB3. A pressure gauge 11 is arranged on the cleaning oil storage tank 6; A liquid level gauge 12 is arranged on the qualified oil product storage tank 5.

[0049] In this embodiment, the oil level gauge on the qualified oil product storage tank 5 displays the amount of oil stored therein, facilitating the control of the new oil volume; The pressure gauge 11 on the cleaning oil storage tank 6 facilitates observing the pressure condition in the cleaning oil storage tank 6. When the amount of cleaning oil in the cleaning oil storage tank 6 is small, the liquid level switch 10 sends a signal to the controller, and is interlocked with the air pump YB3, the fourth valve V4, the sixth valve V6, and the ninth valve V7 without spraying, realizing the automatic filling of the cleaning oil in the cleaning oil storage tank 6.

[0050] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A maintenance equipment for on-load oil switches of transformers, comprising a vehicle body and an oil storage device, a cleaning device, a spraying device and a hoisting device arranged on the vehicle body. It is characterized in that: The oil storage device includes a qualified oil storage tank, a cleaning oil temporary storage tank and a waste oil barrel. The oil outlet of the qualified oil storage tank is communicated with one end of a first valve. The other end of the first valve is communicated with one end of a second valve and one end of a first filter. The other end of the first filter is communicated with the inlet of a first gear oil pump. The outlet of the first gear oil pump is communicated with the inlet of a three-way valve. One outlet of the three-way valve is communicated with the oil inlet of the qualified oil storage tank. The oil outlet of the qualified oil storage tank is communicated with one end of a fourth valve. The other end of the fourth valve is communicated with the cleaning oil temporary storage tank. The oil inlet of the cleaning oil temporary storage tank is communicated with one end of an oil-gas filtering device. The other end of the oil-gas filtering device is communicated with one end of a sixth valve. The other end of the sixth valve is communicated with the air inlet of an air pump. The air outlet of the air pump is communicated with one end of an eighth valve and one end of a ninth valve. The other end of the eighth valve is communicated with the oil outlet of the qualified oil storage tank. One end of a seventh valve is communicated with the air inlet of the air pump. The other end of the fourth valve is communicated with one end of a fifth valve. The other end of the fifth valve is communicated with the spraying device. The spraying device is arranged above the cleaning device. The cleaning device is communicated with one end of a tenth valve. The other end of the tenth valve is communicated with one end of a second filter and one end of an eleventh valve. The other end of the eleventh valve is a waste oil pumping port. The other end of the second filter is communicated with the inlet of a second gear oil pump. The outlet of the second gear oil pump is communicated with the waste oil barrel. The waste oil barrel is communicated with one end of a third manual valve. The other end of the third manual valve is communicated with one end of the second filter.

2. The maintenance equipment for on-load oil switches of transformers according to claim 1. It is characterized in that: The other end of the fourth valve extends to the bottom of the cleaning oil temporary storage tank through a pipeline. A liquid level switch is arranged in the cleaning oil temporary storage tank. The liquid level switch is electrically linked with the air pump. A pressure gauge is arranged on the cleaning oil temporary storage tank.

3. The maintenance equipment for on-load oil switches of transformers according to claim 2. It is characterized in that: The air inlet of the air pump is communicated with one end of the first valve. The other end of the seventh valve is communicated with the air outlet of a dryer. A detachable filter screen is arranged at the air inlet of the dryer.

4. The maintenance equipment for on-load oil switches of transformers according to claim 3. It is characterized in that: A liquid level gauge is arranged on the qualified oil storage tank.

5. The maintenance equipment for on-load oil switches of transformers according to claim 4. It is characterized in that: The cleaning device includes a cleaning pool and a cleaning table. The cleaning table is placed in the cleaning pool. The bottom of the cleaning pool is communicated with one end of the tenth valve.

6. The maintenance equipment for on-load oil switches of transformers according to claim 5. It is characterized in that: A first manual valve is arranged at the other end of the fifth valve. A second manual valve is arranged on the oil-gas filtering device.

7. The maintenance equipment for on-load oil switches of transformers according to claim 6. It is characterized in that: A lifting ring is provided on the vehicle body, a driving motor and a battery are provided inside the vehicle body, the driving motor is connected to the wheels through a transmission, and the battery supplies power to the driving motor through a control switch.

8. An on-load oil switch maintenance equipment for a transformer according to claim 7, characterized in that: The hoisting device includes a support arm, a lifting arm and a driving oil cylinder. One end of the support arm is rotatably arranged on the vehicle body, the other end of the support arm is hinged to the support arm, and both ends of the driving oil cylinder are respectively hinged to the support arm and the lifting arm.

9. An on-load oil switch maintenance equipment for a transformer according to claim 8, characterized in that: The first valve, the second valve, the three-way valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve and the eleventh valve are all electric valves, and are all connected to the controller and powered by the battery. The air pump, the first gear oil pump, the second gear oil pump and the cleaning device are all connected to the controller and powered by the battery.

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