A transformer maintenance vehicle-mounted oil supplementing device and a use method thereof

Abstract

The application discloses a transformer maintenance vehicle-mounted oil supplementing device and a use method, and relates to the technical field of power equipment maintenance. The device comprises a device vehicle body, a plurality of rollers mounted at the bottom of the device vehicle body, a mutually independent oil supplementing tank and a recycling tank arranged on the device vehicle body, a mutually independent oil supplementing pump and a recycling pump connected with the oil supplementing tank and the recycling tank respectively, a speed control mechanism connected with the oil supplementing pump and used for adjusting the oil supplementing speed, a power supply system comprising an external power supply interface and a built-in mobile power supply, a grounding protection device comprising a special grounding terminal, and an interface system comprising a refueling port and a fuel discharge port. The application realizes the separation of new oil injection and waste oil recycling through the independent arrangement of the double oil tanks and the double pumps, avoids cross contamination, realizes precise oil supplementing through speed control, prevents waste, adapts to different site conditions through double power supply design, and guarantees operation safety through grounding protection and sealed interfaces. The application is mobile, convenient to operate, safe and reliable, and can significantly improve oil supplementing operation efficiency.

Description

Technical Field

[0001] This invention relates to the field of power equipment maintenance technology, specifically to a vehicle-mounted oil replenishment device for transformer maintenance and its usage method. Background Technology

[0002] Oil-immersed power transformers, current transformers, reactors, and other oil-filled equipment are widely used in the power industry. After long-term operation, these devices are prone to problems such as oil leakage from the tank, drop in oil level, and deterioration of oil quality. Regular oil replenishment or filtration is required to ensure normal operation of the equipment and the safety of the power grid.

[0003] Current common oil replenishment methods have significant drawbacks: one method requires two people, one climbing to a height to fill the oil with a funnel or bottle-like container, while the other assists on the ground; another method involves one person holding the oil pipe at the top to fill the oil, while the other controls the oil pump on the ground. These methods require a lot of manpower, and the personnel working at the top cannot control the oil flow rate and volume in real time, which can easily lead to overfilling or oil spillage. Furthermore, working at height poses safety hazards.

[0004] Furthermore, the oil storage equipment within substations is mostly large, fixed tanks, which are difficult to move. Replenishing oil requires transporting oil drums back and forth, which is labor-intensive and prone to oil leaks and contamination during transport; alternatively, forklifts are used to tow the tanks, resulting in waste of new oil. At the same time, existing replenishment methods lack waste oil recovery devices, leading to cross-contamination between new and waste oil and low resource utilization. Some substations also have limited on-site power supply conditions, failing to meet the equipment's power needs, and lack dedicated grounding protection, posing safety hazards. Summary of the Invention

[0005] The purpose of this invention is to provide a vehicle-mounted oil replenishment device and its usage method for transformer maintenance, which integrates oil replenishment and waste oil recovery, reduces manpower, improves oil replenishment accuracy and work efficiency, while ensuring oil purity and improving work safety. It is adaptable to various on-site work conditions in substations to overcome the shortcomings of existing transformer oil replenishment operations, such as high manpower requirements, low oil replenishment accuracy, poor equipment mobility, easy oil contamination, poor power supply compatibility, and low work safety.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: On the one hand, the present invention also provides a vehicle-mounted oil replenishment method for transformer maintenance based on the above-mentioned device, including oil replenishment operation steps and waste oil recovery operation steps: Oil replenishment operation steps: Push the device to the working position and reliably connect the grounding wire to the grounding terminal; Depending on the on-site power conditions, choose to connect an external 220V AC power supply or enable the built-in portable power supply; Seal and connect the refueling port to the oil tank, oil pump, and oil filling port of the transformer equipment respectively; Start the oil replenishment pump and adjust the oil replenishment speed through the speed control mechanism to inject the insulating oil in the oil replenishment tank into the transformer equipment; After the oil replenishment is complete, turn off the oil replenishment pump and disconnect all connecting parts.

[0007] Waste oil recycling operation steps: Seal and connect the oil drain port to the oil drain port of the transformer equipment, the recovery pump, and the recovery oil tank respectively. Start the recovery pump to extract the waste oil from the transformer equipment into the recovery oil tank; After recycling is complete, turn off the recycling pump, disconnect all connecting parts, and process the recycled waste oil.

[0008] Furthermore, the oil replenishment operation and the waste oil recycling operation are performed independently by one operator, and the oil replenishment operation and the waste oil recycling operation can be performed simultaneously.

[0009] On the other hand, the present invention provides a vehicle-mounted oil replenishment device for transformer maintenance, including a device body, an oil replenishment tank, a recovery oil tank, an oil replenishment pump, a recovery pump, a speed control mechanism, a power supply system, a grounding protection device, and an interface system; The device is equipped with rollers at the bottom of the vehicle body. The replenishing oil tank and the recovery oil tank are independently installed on the device vehicle body. The replenishing oil tank is used to store insulating oil to be injected, and the recovery oil tank is used to collect waste oil discharged from the transformer equipment. The replenishing oil pump is connected to the replenishing oil tank and is used to inject the insulating oil in the replenishing oil tank into the transformer equipment. The recovery pump is connected to the recovery oil tank and is used to extract the waste oil in the transformer equipment into the recovery oil tank. The replenishing oil pump and the recovery pump are set up independently of each other. The speed control mechanism is connected to the oil replenishment pump and is used to adjust the oil replenishment speed of the oil replenishment pump; The power system includes an external power interface and a built-in portable power supply. The external power interface is used to connect to a 220V AC power supply, and the built-in portable power supply is used to power the device when there is no external power supply. The grounding protection device includes a dedicated grounding terminal for connecting a grounding wire to achieve grounding protection for the device; The interface system includes a filler port and a drain port. The filler port is used to connect the replenishment oil tank, the replenishment pump and the oil filling port of the transformer equipment. The drain port is used to connect the recovery oil tank, the recovery pump and the oil discharge port of the transformer equipment.

[0010] Furthermore, the speed control mechanism is a speed control knob, and the oil replenishment pump supports at least two oil replenishment speed modes, including a slow oil replenishment mode and a low-speed oil replenishment mode.

[0011] Furthermore, the external power interface is a 220V AC power socket with a rated power of 800W; the built-in power bank is a rechargeable battery pack, which is electrically connected to the external power interface and is charged through the external power source.

[0012] Furthermore, both the oil filling port and the oil drain port adopt a sealed interface structure and are connected to the oil replenishment pump, the recovery pump, and the oil filling port and oil drain port of the transformer equipment respectively through oil-resistant hoses.

[0013] Furthermore, both the replenishment tank and the recovery tank are equipped with liquid level observation windows, and the installation positions of the replenishment pump and the recovery pump are lower than the installation positions of the replenishment tank and the recovery tank.

[0014] Furthermore, the device body is also equipped with a control panel and a push-pull handle. The speed control mechanism and the control switch of the power system are integrated on the control panel, and the push-pull handle is used to assist in moving the device.

[0015] Furthermore, both the replenishment pump and the recovery pump are electric pumps, each driven by an independent motor, which is electrically connected to the power system.

[0016] Furthermore, the grounding terminal is located on the outside of the device vehicle body to facilitate grounding wire connection.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a vehicle-mounted oil replenishment device for transformer maintenance. It features independent replenishment and recovery oil tanks, storing new and waste oil separately. This avoids cross-contamination issues caused by mixed oil containers or improper transportation, a problem common in traditional methods, ensuring the purity of the insulating oil injected into the equipment meets requirements. Simultaneously, the recovery oil tank collects waste oil for subsequent processing or reuse, conserving insulating oil resources and solving the problems of oil waste and pollution. Independent replenishment and recovery pumps are included; the replenishment pump is dedicated to new oil injection, while the recovery pump is dedicated to waste oil extraction. This dual-pump independent design not only completely avoids cross-contamination between oil lines but also allows replenishment and waste oil recovery operations to be performed independently or simultaneously, significantly improving operational efficiency. A speed control mechanism connected to the replenishment pump is also included, allowing operators to precisely adjust the replenishment speed in real time based on the specific type of transformer equipment, installation height, oil level change rate, and other actual operating conditions. Attached Figure Description

[0018] Figure 1This is a front view schematic diagram of the vehicle-mounted oil replenishment device for transformer maintenance according to the present invention.

[0019] Figure 2 This is a rear view schematic diagram of the vehicle-mounted oil replenishment device for transformer maintenance according to the present invention.

[0020] Figure 3 This is a left-side view of the vehicle-mounted oil replenishment device for transformer maintenance according to the present invention.

[0021] Figure 4 This is a top view schematic diagram of the vehicle-mounted oil replenishment device for transformer maintenance according to the present invention.

[0022] In the diagram: 1. Replenishing oil tank; 2. Recycled oil tank; 3. Replenishing pump; 4. Recycled pump; 5. Speed ​​control knob; 6. External power interface; 7. Built-in power supply; 8. Dedicated grounding terminal; 9. Roller; 10. Filling port; 11. Drain port. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0032] See Figures 1 to 4 This invention provides a vehicle-mounted oil replenishment device for transformer maintenance, comprising a vehicle body with rollers 9 mounted on the bottom of the vehicle body. The purpose of this design is to enable the device to move flexibly, allowing operators to easily push it to any work location within the substation without manual handling, effectively reducing labor intensity and solving the problem of difficult movement of fixed oil tanks.

[0033] The device vehicle is equipped with two independent oil tanks: a replenishment tank 1 and a recovery tank 2. Replenishment tank 1 stores qualified insulating oil, providing the required oil to the equipment requiring replenishment. Recovery tank 2 collects waste oil discharged from the transformer equipment. The purpose of this separate design is to prevent cross-contamination between new and waste oil, ensuring the purity of the insulating oil used for replenishment, while also enabling centralized recovery of waste oil for subsequent processing or reuse, saving resources and solving the problems of cross-contamination and resource waste.

[0034] It also includes two independent oil replenishment pumps, 3 and 4. Oil replenishment pump 3 is connected to oil replenishment tank 1 and is used to inject insulating oil from tank 1 into the transformer equipment. Oil recovery pump 4 is connected to oil recovery tank 2 and is used to extract waste oil from the transformer equipment into tank 2. The purpose of these two independent pumps is to completely avoid cross-contamination of the oil lines, while allowing oil replenishment and waste oil recovery operations to be performed simultaneously, improving operational efficiency and solving the problems of low efficiency caused by the separation of oil replenishment and recovery processes.

[0035] To improve the accuracy of oil replenishment, the device is equipped with a speed control mechanism, preferably a speed control knob 5, which is connected to the oil replenishment pump 3 to adjust the oil replenishment speed of the pump 3. The purpose of this design is to allow operators to precisely adjust the oil replenishment speed in real time according to the specific type of transformer equipment, installation height, oil level change rate, and other actual operating conditions, avoiding oil overflow and air bubble mixing caused by excessive flow rate. This solves the technical problems of being unable to control the oil flow rate in real time and the tendency to over-replenish oil. In this embodiment, the oil replenishment pump 3 supports both slow and low-speed oil replenishment modes to adapt to different operating conditions.

[0036] Regarding power supply, the device adopts a dual-power design, including an external power interface 6 and a built-in power bank 7. The external power interface 6 is a 220V AC power socket with a rated power of 800W, used for connecting to a stable AC power source. The built-in power bank 7 is a rechargeable battery pack, electrically connected to the external power interface 6, and can be charged via an external power source to power the device when no external power is available. The purpose of this dual-power design is to ensure that the device can operate normally in any working scenario, solving the problem of insufficient on-site power conditions to meet the equipment's operating requirements.

[0037] To ensure operational safety, the device is equipped with a dedicated grounding terminal 8, preferably located on the outside of the device vehicle body for easy grounding wire connection. The purpose of this design is to reliably connect the grounding wire to the grounding terminal before operation, effectively preventing safety accidents caused by static electricity accumulation and electrical faults, ensuring the personal safety of operators and the safe operation of equipment, and solving the problems of lack of grounding protection and poor safety during operation.

[0038] A standardized interface system is also provided, including an oil filler port 10 and an oil drain port 11. The oil filler port 10 connects the replenishing oil tank 1 and the replenishing pump 3 to the oil filling port of the transformer equipment; the oil drain port 11 connects the recovery oil tank 2 and the recovery pump 4 to the oil drain port of the transformer equipment. In this embodiment, both the oil filler port 10 and the oil drain port 11 adopt a sealed interface structure and are connected to the replenishing pump 3, the recovery pump 4, and the oil filling port and oil drain port of the transformer equipment respectively via oil-resistant hoses. The purpose of this design is to ensure reliable sealing during oil transportation, effectively prevent leakage and impurity contamination, and solve the problems of easy leakage and contamination during oil transportation.

[0039] To further enhance the practicality of the device, both the replenishment oil tank 1 and the recovery oil tank 2 are equipped with liquid level observation windows, which facilitates operators to monitor the oil volume in real time. The installation positions of the replenishment oil pump 3 and the recovery pump 4 are lower than the installation positions of the replenishment oil tank 1 and the recovery oil tank 2. The purpose of this design is to use gravity to achieve gravity-flow supply of oil, ensure smooth pumping, and avoid dry suction.

[0040] The device is also equipped with a control panel and a push-pull handle. The speed control mechanism and power system control switches are integrated into the control panel. This design aims to make the operating interface centralized and simple, allowing operators to quickly master and use it. The push-pull handle is used to assist in moving the device, improving its ease of movement.

[0041] Both the replenishment pump 3 and the recovery pump 4 are electric pumps, each driven by an independent motor, which is electrically connected to the power supply system. The purpose of this design is to ensure that the two pumps can operate independently without interference, providing the hardware foundation for synchronous operation.

[0042] In another embodiment of the present invention, a method for using a vehicle-mounted oil replenishment device for transformer maintenance is also provided.

[0043] Oil replenishment operation steps: The operator pushes the device to the working position near the transformer equipment to be repaired by pushing and pulling the handle and roller 9, and then reliably connects the grounding wire to the dedicated grounding terminal 8 on the outside of the device; The operator selects the appropriate power source based on the on-site power conditions: if a stable 220V AC power source is available on-site, the power cord is inserted into the external power interface 6; if the on-site power conditions do not meet the requirements, the built-in portable power supply 7 is activated, and the device is powered by the power switch on the control panel. The dual power supply design ensures that the device can be used normally in any operating scenario, solving the problem of on-site power conditions not meeting the equipment usage requirements. The operator seals the oil filling port 10 to the oil replenishment tank 1, the oil replenishment pump 3, and the oil filling port of the transformer equipment through the oil-resistant hose, ensuring that each connection point is firm and leak-free. The sealing interface design and the oil-resistant hose connection ensure reliable sealing during oil transmission, effectively preventing leakage and impurity contamination, and solving the problems of easy leakage and contamination during oil transportation. The operator starts the oil replenishment pump 3 via the control panel and adjusts the oil replenishment speed using the speed control knob 5 according to the specific conditions of the transformer equipment, such as equipment type, installation height, current oil level, and rate of oil level change. The device supports both slow and low-speed oil replenishment modes, allowing the operator to select the appropriate speed for replenishment. During the replenishment process, the operator can monitor the oil level in the oil replenishment tank 1 in real time through the liquid level observation window and judge the progress of oil replenishment by observing the oil level indicator on the transformer equipment. The speed control function allows operators to precisely control the oil replenishment rate in real time, avoiding oil overflow and air bubbles caused by excessive flow rate, thus solving the problems of not being able to control the oil flow rate in real time and being prone to over-replenishment; the liquid level observation window facilitates oil quantity monitoring and avoids dry suction.

[0044] Once the oil level reaches the predetermined level, the operator shuts off the oil replenishment pump 3, disconnects the oil filling port 10 from the transformer equipment oil filling port, the oil replenishment pump 3, and the oil replenishment tank 1 in sequence, and then cleans up the equipment and the work site.

[0045] Waste oil recycling operation steps: The operator pushes the device to the working position near the transformer equipment to be repaired by pushing and pulling the handle and roller 9, and then reliably connects the grounding wire to the dedicated grounding terminal 8 on the outside of the device; The operator selects the appropriate power source based on the on-site power conditions: if a stable 220V AC power source is available on-site, the power cord is inserted into the external power interface 6; if the on-site power conditions do not meet the requirements, the built-in portable power supply 7 is activated, and the device is powered by the power switch on the control panel. The operator connects the oil drain port 11 to the oil drain port of the transformer equipment, the recovery pump 4, and the recovery oil tank 2 through oil-resistant hoses to ensure that each connection point is firm and leak-free; the sealed interface design ensures that there is no leakage during the waste oil recovery process and avoids environmental pollution; The operator starts the recycling pump 4 via the control panel to pump the waste oil from the transformer equipment into the recycling tank 2. During the recycling process, the operator can monitor the oil level in the recycling tank 2 in real time through the liquid level observation window to prevent overflow. The centralized collection of waste oil through the dedicated recycling pump 4 and recycling tank 2 facilitates subsequent processing or reuse, solving the problems of lack of recycling equipment and resource waste. After the waste oil is completely extracted, the operator shuts off the recovery pump 4 and disconnects the oil outlet 11 from the transformer equipment drain outlet, the recovery pump 4, and the recovery oil tank 2 in sequence. The recovered waste oil is then properly disposed of in accordance with relevant standards.

[0046] Simultaneous operation of oil replenishment and recovery: The operator pushes the device to the working position near the transformer equipment to be repaired by pushing and pulling the handle and roller 9, and then reliably connects the grounding wire to the dedicated grounding terminal 8 on the outside of the device; The operator selects the appropriate power source based on the on-site power conditions: if a stable 220V AC power source is available on-site, the power cord is inserted into the external power interface 6; if the on-site power conditions do not meet the requirements, the built-in portable power supply 7 is activated, and the device is powered by the power switch on the control panel. The operator simultaneously establishes two connections: The oil filling port 10 is sealed and connected to the oil replenishment tank 1, the oil replenishment pump 3 and the oil filling port of the transformer equipment respectively through oil-resistant hoses; The oil drain port 11 is sealed and connected to the oil drain port of the transformer equipment, the recovery pump 4 and the recovery oil tank 2 respectively through oil-resistant hoses; The operator simultaneously starts the replenishing oil pump 3 and the recovery pump 4 via the control panel, and adjusts the replenishing oil speed as needed. The replenishing oil pump 3 injects new oil from the replenishing oil tank 1 into the transformer equipment, while the recovery pump 4 extracts waste oil from the transformer equipment into the recovery oil tank 2. The two operations are carried out simultaneously.

[0047] The independent dual-pump setup allows for simultaneous oil replenishment and waste oil recovery, significantly shortening overall operation time, improving operational efficiency, and solving the problems of separation between oil replenishment and recovery, resulting in low overall efficiency.

[0048] Once the oil level reaches the predetermined level and the waste oil has been completely extracted, the operator simultaneously shuts off the oil replenishment pump 3 and the recovery pump 4, disconnects the connecting parts of the oil inlet 10 and the oil outlet 11 in sequence, tidies up the equipment and the work site, and properly disposes of the recovered waste oil.

[0049] This invention features a compact structure, flexible mobility, and convenient operation. It can be widely used in oil replenishment and waste oil recovery operations for oil-immersed transformers, oil-immersed current transformers, oil-immersed reactors, and other oil-filled equipment in various locations such as substations, power plants, and industrial and mining enterprises. It is particularly suitable for applications requiring frequent relocation or where on-site power conditions are limited, demonstrating excellent industrial practicality and widespread application value.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A vehicle-mounted oil replenishment method for transformer maintenance, characterized in that, Includes the following steps: Oil replenishment operation steps: Push the device to the working position and reliably connect the grounding wire to the grounding terminal (8); Depending on the on-site power conditions, choose to connect an external 220V AC power supply or enable the built-in mobile power supply (7). The oil filling port (10) is sealed and connected to the oil replenishment tank (1), the oil replenishment pump (3) and the oil filling port of the transformer equipment respectively; Start the oil replenishment pump (3), adjust the oil replenishment speed through the speed control mechanism, and inject the insulating oil in the oil replenishment tank (1) into the transformer equipment; After the oil replenishment is completed, turn off the oil replenishment pump (3) and disconnect all connecting parts; Waste oil recycling operation steps: The oil drain port (11) is sealed and connected to the oil drain port of the transformer equipment, the recovery pump (4) and the recovery oil tank (2) respectively; Start the recycling pump (4) to extract the waste oil in the transformer equipment into the recycling tank (2); After recycling is completed, turn off the recycling pump (4), disconnect all connecting parts, and process the recycled waste oil.

2. The vehicle-mounted oil replenishment method for transformer maintenance according to claim 1, characterized in that, The oil replenishment operation and the waste oil recycling operation are performed independently by one operator, and the oil replenishment operation and the waste oil recycling operation are carried out simultaneously.

3. A vehicle-mounted oil replenishment device for transformer maintenance, used to implement the method as described in any one of claims 1-2, characterized in that, include: The device vehicle body is equipped with rollers (9) at the bottom of the device vehicle body. The oil replenishment tank (1) and the oil recovery tank (2) are independently installed on the vehicle body of the device. The oil replenishment tank (1) is used to store insulating oil to be injected, and the oil recovery tank (2) is used to collect waste oil discharged from the transformer equipment. The oil replenishment pump (3) and the recovery pump (4) are connected to the oil replenishment tank (1) and are used to inject the insulating oil in the oil replenishment tank (1) into the transformer equipment. The recovery pump (4) is connected to the recovery tank (2) and is used to extract the waste oil in the transformer equipment into the recovery tank (2). The oil replenishment pump (3) and the recovery pump (4) are set up independently of each other. Speed ​​control mechanism, which is connected to the oil replenishment pump (3) and is used to adjust the oil replenishment speed of the oil replenishment pump (3); The power system includes an external power interface (6) and a built-in mobile power supply (7). The external power interface (6) is used to connect to a 220V AC power supply, and the built-in mobile power supply (7) is used to supply power to the device when there is no external power supply. A grounding protection device, the grounding protection device including a dedicated grounding terminal (8) for connecting a grounding wire to realize the grounding protection of the device; The interface system includes an oil filling port (10) and an oil drain port (11). The oil filling port (10) is used to connect the oil replenishment tank (1), the oil replenishment pump (3) and the oil filling port of the transformer equipment. The oil drain port (11) is used to connect the recovery tank (2), the recovery pump (4) and the oil drain port of the transformer equipment.

4. The vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, The speed control mechanism is a speed control knob (5), and the oil replenishment pump (3) supports at least two oil replenishment speed modes.

5. The vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, The external power interface (6) is a 220V AC power socket with a rated power of 800W; the built-in mobile power supply (7) is a rechargeable battery pack, which is electrically connected to the external power interface (6) and is charged through the external power supply.

6. The vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, Both the oil filling port (10) and the oil drain port (11) adopt a sealed interface structure and are connected to the oil replenishment pump (3), the recovery pump (4), and the oil filling port and oil drain port of the transformer equipment respectively through oil-resistant hoses.

7. The vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, Both the replenishing oil tank (1) and the recovery oil tank (2) are equipped with liquid level observation windows, and the installation positions of the replenishing oil pump (3) and the recovery pump (4) are lower than the installation positions of the replenishing oil tank (1) and the recovery oil tank (2).

8. The vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, The device is also equipped with a control panel and a push-pull handle. The speed control mechanism and the power system control switch are integrated on the control panel, and the push-pull handle is used to assist in moving the device.

9. A vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, Both the replenishing pump (3) and the recovery pump (4) are electric pumps, driven by independent motors, which are electrically connected to the power supply system.

10. A vehicle-mounted oil replenishment device for transformer maintenance according to claim 3, characterized in that, The grounding terminal (8) is located on the outside of the device vehicle body to facilitate grounding wire connection.

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