Oil-immersed circuit transformer with cooling structure

Abstract

The application relates to the technical field of oil-immersed transformers, and particularly discloses an oil-immersed circuit transformer with a cooling structure, which comprises heat dissipation fins arranged on the front side of a transformer body; an internal cooling mechanism arranged in the transformer body and used for conveniently cooling an internal iron core winding assembly; and a rotating mechanism arranged on the outer side of the transformer body and used for spraying and cooling the heat dissipation fins. The oil-immersed circuit transformer with the cooling structure is characterized in that: cooling oil is accurately guided by a bend pipe assembly, uniformly sprayed to the surface of the iron core winding assembly by a spray head, directly acts on a core heating area, rapidly absorbs heat, and eliminates local overheating and heat accumulation; under the driving of a servo motor, a rotating disc drives a water spraying pipe to reciprocatingly swing and spray, realizes full-area and dead-angle-free coverage water cooling of the heat dissipation fins, greatly improves the utilization rate of the external heat dissipation area, speeds up the heat dissipation speed of the surface of the fins, and strengthens the overall heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of oil-immersed transformer technology, specifically to an oil-immersed circuit transformer with a cooling structure. Background Technology

[0002] The radiator refers to the oil pipe type radiator. As is known in the industry, in order to ensure the long-term and stable operation of oil-immersed transformers, plate radiators are usually installed on both sides of the transformer body along the length direction by means of flange connection or other similar methods. The radiator and the heat transfer oil inside the transformer form a circulating cooling circuit, thereby cooling the iron core inside the transformer, controlling the temperature rise of the transformer, and ensuring the normal operation and safety of the power supply and distribution system.

[0003] For example, Chinese patent CN219163151U discloses an oil-immersed transformer with a heat dissipation structure. The coolant in the storage tank is pumped into the cooling pipes by a water pump, keeping the ends of the inlet and outlet pipes relatively cool. When the high-temperature oil inside the transformer body enters the inlet pipe, it undergoes initial heat dissipation. The oil then enters the heat sink for secondary heat dissipation. After secondary heat dissipation, the oil re-enters the transformer body, passing through the end of the outlet pipe, where it undergoes a third heat dissipation. In this cycle, the oil undergoes three heat dissipation steps, reducing the time it takes for the high-temperature oil to cool down and improving its cooling efficiency. This improves the heat dissipation efficiency, thereby enhancing the overall heat dissipation effect of the radiator. For example, Chinese Patent CN212161513U discloses an oil cooling structure based on an oil-immersed transformer. This structure, through the arrangement of a heat exchanger, water supply pipe, and drain pipe, allows the oil in the tank to be pumped into the heat exchanger for heat exchange during transformer operation. Water is injected into the heat exchanger through the water supply pipe and drain pipe to obtain heat. The heat exchange pipe, combined with baffles, ensures that the heat from the oil is fully dissipated, improving the cooling efficiency and effectively utilizing the oil's heat.

[0004] However, existing oil-immersed transformers rely solely on external heat sinks for passive heat dissipation, resulting in low overall heat dissipation efficiency, limited heat exchange speed, and a lack of internal adjustable heat dissipation mechanisms. This makes it difficult to specifically address the localized heat accumulation problem in the core windings, and the internal oil heat exchange is uneven. Consequently, the heat dissipation adaptability and stability under high-temperature conditions are insufficient, leaving room for further improvement.

[0005] Therefore, we propose an oil-immersed circuit transformer with a cooling structure to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide an oil-immersed circuit transformer with a cooling structure to solve the problems mentioned in the background art. The existing oil-immersed transformers rely solely on external heat sinks for passive heat dissipation, resulting in low overall heat dissipation efficiency, limited heat exchange speed, lack of internal adjustable heat dissipation mechanism, difficulty in specifically improving the local heat accumulation problem of the iron core winding, poor heat exchange uniformity of internal oil, and insufficient heat dissipation adaptability and stability under high temperature conditions. Therefore, there is still room for further improvement.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an oil-immersed circuit transformer with a cooling structure, comprising:

[0008] The transformer body has heat dissipation fins on its front side, and the heat dissipation fins are arranged in an array and are symmetrical about the vertical central axis of the transformer body.

[0009] Also includes:

[0010] The transformer body is equipped with an internal cooling mechanism for facilitating heat dissipation of the internal iron core winding assembly. The cooling mechanism consists of an oil inlet, a bend assembly, and a nozzle. The transformer body is also equipped with a partition plate.

[0011] The outer side of the transformer body is provided with a rotating mechanism for spraying heat dissipation onto the heat dissipation fins. The rotating mechanism is composed of a turntable, a connecting block, a first connecting rod, a moving block, a limiting groove, a second connecting rod, and a servo motor. A mounting frame is provided on the front side of the transformer body, and the mounting frame is symmetrical about the vertical central axis of the transformer body.

[0012] Preferably, the partition plate has an oil inlet inside, and the oil inlets are arranged in an array. The lower side of the oil inlet is fixedly connected to one end of the bend assembly, and the other end of the bend assembly is provided with a nozzle.

[0013] Preferably, the bending tube assembly is symmetrical about the vertical central axis of the core winding assembly, the core winding assembly is located on the lower side of the partition plate, and a temperature sensor is located on the lower inner side of the transformer body.

[0014] Preferably, the lower side of the transformer body is fixedly connected to the recovery pipe, the right side of the recovery pipe is fixedly connected to the oil circulation tank, the upper side of the oil circulation tank is fixedly connected to the conveying pipe, and the left side of the conveying pipe is fixedly connected to the right side of the transformer body, wherein a controller is provided on the front side of the oil circulation tank.

[0015] Preferably, an air jet pipe is provided on the upper side of the transformer body, and an air jet head is provided on the lower side of the air jet pipe. The air jet heads are arranged in an array, and the air jet pipe is fixedly connected to the air supply pipe. The air jet pipe is symmetrical about the vertical central axis of the transformer body.

[0016] Preferably, a water spray pipe is rotatably connected inside the mounting bracket, and a water spray head is provided on the lower side of the water spray pipe. The water spray head is distributed in an array, and the water spray pipe and the water supply pipe are rotatably connected by a sealing element.

[0017] Preferably, the water supply pipe is fixedly connected to the support frame, and the water spray pipe is symmetrical about the vertical central axis of the transformer body, and the left side of the water spray pipe is fixedly connected to the turntable.

[0018] Preferably, the turntable has a slot inside, and the slot is slidably connected to the connecting block, the connecting block is rotatably connected to the first connecting rod, and the first connecting rod is rotatably connected to the second connecting rod.

[0019] Preferably, the first connecting rod is rotatably connected to the moving block, the moving block is slidably connected to the limiting groove, the limiting groove is fixedly connected to the transformer body, and the turntable, slot, connecting block, first connecting rod, moving block, limiting groove, second connecting rod and servo motor are all one-to-one correspondences.

[0020] Preferably, the second connecting rod is fixedly connected to the output shaft of the servo motor, and the servo motor is fixedly connected to the left side of the transformer body.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the oil-immersed circuit transformer with cooling structure has cooling oil precisely guided by the bending tube assembly and evenly sprayed onto the surface of the iron core winding assembly by the nozzle, directly acting on the core heat-generating area, quickly absorbing heat and eliminating local overheating and heat accumulation problems; under the drive of the servo motor, the turntable drives the water spray pipe to perform reciprocating oscillation spraying, realizing full-area, no-dead-angle coverage of water cooling of the heat dissipation fins, greatly improving the utilization rate of the external heat dissipation area, accelerating the heat dissipation speed of the fin surface, and enhancing the overall heat exchange effect;

[0022] 1. Equipped with an internal cooling mechanism, bending pipe assembly, and nozzle, the cooling oil is precisely guided by the bending pipe assembly and evenly sprayed onto the surface of the iron core winding assembly by the nozzle, directly acting on the core heating area, quickly absorbing heat and eliminating local overheating and heat accumulation problems, making the internal temperature distribution more uniform, avoiding aging or damage of the winding due to local high temperature, and significantly extending its service life.

[0023] 2. It is equipped with an oil circulation tank, a recovery pipe and a delivery pipe, forming a fully enclosed continuous oil cooling circulation system. High-temperature oil is recovered and cooled in time, and low-temperature oil is continuously replenished by spraying, forming a stable and efficient heat exchange circuit, which greatly improves the overall heat exchange efficiency of the oil and ensures that the oil temperature is stable and controllable during long-term operation.

[0024] 3. Equipped with a rotating mechanism, turntable, and water spray pipe, the turntable drives the water spray pipe to reciprocate and oscillate under the drive of a servo motor, so as to achieve water cooling covering the entire area of ​​the heat dissipation fins without dead angles, greatly improving the utilization rate of the external heat dissipation area, accelerating the heat dissipation speed of the fin surface, and enhancing the overall heat exchange effect.

[0025] 4. Equipped with jet pipes and jet heads, it works in conjunction with the water spray system to form a dual enhanced heat dissipation system of water cooling and air cooling. The airflow accelerates the evaporation of moisture on the fin surface and air convection, further improving the heat dissipation rate, quickly reducing the temperature of the heat dissipation fins, and improving the overall heat dissipation capacity of the transformer.

[0026] 5. Equipped with a temperature sensor and controller, it can monitor the internal oil temperature of the transformer in real time and automatically start / stop, adjust the circulation and spray intensity according to temperature changes, achieving intelligent and precise temperature control without manual intervention, which reduces energy consumption and improves the safety and stability of equipment operation. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a first-view structural diagram of the entire invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective.

[0030] Figure 3 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0031] Figure 4 For the present invention Figure 1 Enlarged structural diagram at point B;

[0032] Figure 5 This is a schematic diagram of the cross-sectional structure of the transformer body of the present invention;

[0033] Figure 6 This is a schematic diagram of the connection structure between the bend assembly and the nozzle of the present invention;

[0034] Figure 7 This is an exploded view of the slotted and connecting block structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the working structure of the turntable of the present invention.

[0036] In the diagram: 1. Transformer body; 2. Separator plate; 3. Oil inlet; 4. Bending pipe assembly; 5. Nozzle; 6. Iron core winding assembly; 7. Temperature sensor; 8. Recovery pipe; 9. Oil circulation tank; 10. Delivery pipe; 11. Controller; 12. Heat dissipation fins; 13. Air jet pipe; 14. Air jet head; 15. Air supply pipe; 16. Mounting bracket; 17. Water spray pipe; 18. Water spray head; 19. Water supply pipe; 20. Support frame; 21. Turntable; 22. Slot; 23. Connecting block; 24. First connecting rod; 25. Moving block; 26. Limiting slot; 27. Second connecting rod; 28. Servo motor. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Please see Figures 1-8 The present invention provides a technical solution: an oil-immersed circuit transformer with a cooling structure, comprising: a transformer body 1, a separator plate 2, an oil inlet 3, a bend assembly 4, a nozzle 5, an iron core winding assembly 6, a temperature sensor 7, a recovery pipe 8, an oil circulation tank 9, a conveying pipe 10, a controller 11, heat dissipation fins 12, a jet pipe 13, a jet head 14, an air supply pipe 15, a mounting bracket 16, a water spray pipe 17, a water spray head 18, a water supply pipe 19, a support frame 20, a turntable 21, a slot 22, a connecting block 23, a first connecting rod 24, a moving block 25, a limiting groove 26, a second connecting rod 27, and a servo motor 28.

[0039] Existing oil-immersed transformers rely solely on external heat sinks for passive heat dissipation, resulting in low overall heat dissipation efficiency, limited heat exchange speed, and a lack of internal adjustable heat dissipation mechanisms. This makes it difficult to address the localized heat accumulation problem in the core windings, and the internal oil heat exchange is uneven. Consequently, the heat dissipation adaptability and stability under high-temperature conditions are insufficient, leaving room for further improvement.

[0040] like Figures 1-8As shown, the transformer body 1 has a partition plate 2 inside, and oil inlets 3 are arranged in an array inside the partition plate 2. The lower side of the oil inlets 3 is fixedly connected to one end of the bent pipe assembly 4, and the other end of the bent pipe assembly 4 is equipped with a nozzle 5. The bent pipe assembly 4 is symmetrical about the vertical central axis of the iron core winding assembly 6, and the iron core winding assembly 6 is located on the lower side of the partition plate 2. A temperature sensor 7 is installed on the lower inner side of the transformer body 1. The lower side of the transformer body 1 is fixedly connected to the recovery pipe 8, and the right side of the recovery pipe 8 is fixedly connected to the oil circulation tank 9. The upper side of the oil circulation tank 9 is connected to the... The conveying pipe 10 is fixedly connected, and the left side of the conveying pipe 10 is fixedly connected to the right side of the transformer body 1. The controller 11 is provided on the front side of the oil circulation tank 9. The heat dissipation fins 12 are provided on the front side of the transformer body 1, and the heat dissipation fins 12 are arranged in an array and are symmetrical about the vertical central axis of the transformer body 1. The air jet pipe 13 is provided on the upper side of the transformer body 1, and the air jet head 14 is provided on the lower side of the air jet pipe 13. The air jet head 14 is arranged in an array, and the air jet pipe 13 is fixedly connected to the air supply pipe 15. The air jet pipe 13 is symmetrical about the vertical central axis of the transformer body 1.

[0041] A mounting bracket 16 is provided on the front side of the transformer body 1, and the mounting bracket 16 is symmetrical about the vertical central axis of the transformer body 1. A water spray pipe 17 is rotatably connected inside the mounting bracket 16, and water spray heads 18 are provided on the lower side of the water spray pipe 17. The water spray heads 18 are distributed in an array, and the water spray pipe 17 is rotatably connected to the water supply pipe 19 through a seal. The water supply pipe 19 is fixedly connected to the support frame 20, and the water spray pipe 17 is symmetrical about the vertical central axis of the transformer body 1. The left side of the water spray pipe 17 is fixedly connected to the turntable 21. The transformer body 1 has an internal slot 22, which is slidably connected to a connecting block 23. The connecting block 23 is rotatably connected to a first connecting rod 24, which is rotatably connected to a second connecting rod 27. The first connecting rod 24 is also rotatably connected to a moving block 25. The moving block 25 is slidably connected to a limiting groove 26, which is fixedly connected to the transformer body 1. The turntable 21, slot 22, connecting block 23, first connecting rod 24, moving block 25, limiting groove 26, second connecting rod 27, and servo motor 28 are all in one-to-one correspondence. The second connecting rod 27 is fixedly connected to the output shaft of the servo motor 28, and the servo motor 28 is fixedly connected to the left side of the transformer body 1.

[0042] like Figure 1 , Figure 2 and Figure 5As shown, when using an oil-immersed circuit transformer with a cooling structure, the transformer body 1 is energized and put into operation. The iron core winding assembly 6 inside it continuously generates a large amount of heat as the core heat-generating component, causing the temperature of the insulating oil inside the transformer body 1 to rise rapidly. The temperature sensor 7 installed on the lower inner side of the transformer body 1 collects the temperature signal of the internal oil in real time and transmits the signal stably to the controller 11. The controller 11 analyzes and judges the oil temperature data in real time. When the oil temperature rises to the preset start threshold, the controller 11 immediately and simultaneously starts the internal oil cooling mechanism and the external rotating spray heat dissipation mechanism, entering a fully automatic and efficient heat dissipation mode.

[0043] like Figure 5 and Figure 6 As shown, the oil circulation tank 9 serves as the circulation power and cooling core of the cooling oil. It stably delivers the cooled low-temperature insulating oil to the transformer body 1 through the delivery pipe 10. The cooling oil first reaches the position of the partition plate 2, passes through the oil inlets 3 distributed in an array on the partition plate 2, and enters the bent pipe assembly 4 connected to the oil inlet 3 evenly. The bent pipe assembly 4 is symmetrically arranged around the iron core winding assembly 6, which precisely guides the cooling oil to the area above the heat generation area. Finally, it is sprayed onto the surface of the iron core winding assembly 6 in a directional, uniform, and full-coverage manner through the nozzle 5. The cooling oil directly contacts the high-temperature iron core winding assembly 6, quickly absorbs the heat generated by the core component, and eliminates the problem of local heat accumulation and uneven temperature from the root.

[0044] After absorbing heat, the high-temperature oil is collected at the bottom of the transformer body 1 under the action of gravity. It then flows back to the oil circulation tank 9 through the recovery pipe 8 for cooling. The cooled oil is then sent back to the transformer body 1 through the delivery pipe 10, thus forming a continuous, closed-loop, and efficient oil circulation and heat dissipation circuit. This continuously and stably reduces the internal oil temperature, ensuring that the core winding assembly 6 is always within the safe operating temperature range.

[0045] like Figure 1 , Figure 3 , Figure 7 and Figure 8 As shown, while the internal oil is circulating and cooling, the controller 11 synchronously starts the servo motor 28. The output shaft of the servo motor 28 rotates stably, driving the second connecting rod 27, which is fixedly connected to it, to perform a circular motion. The second connecting rod 27 drives the first connecting rod 24, which is rotatably connected to it, to move in tandem. The connecting block 23 at the end of the first connecting rod 24 slides in the slot 22 inside the turntable 21, converting the rotational motion into reciprocating oscillation power. During the movement of the turntable 21, the water spray pipe 17, which is fixedly connected to it, performs a stable reciprocating oscillation within the mounting frame 16. The mounting frame 16 provides reliable rotational support for the water spray pipe 17, while the support frame 20 fixes the water supply pipe 19 to ensure stable water supply without shaking.

[0046] like Figure 1 , Figure 3 and Figure 4 As shown, the water supply pipe 19 continuously supplies cooling water to the spray pipe 17. The cooling water, through the spray nozzles 18 arranged in an array on the lower side of the spray pipe 17, performs a wide-range, no-dead-angle oscillating water spray on the heat dissipation fins 12 arranged in an array on the outer side of the transformer body 1, quickly removing the heat from the surface of the heat dissipation fins 12. At the same time, the air supply pipe 15 continuously supplies air to the air jet pipe 13. The airflow is blown downwards and directionally through the air jet nozzles 14 arranged in an array on the lower side of the air jet pipe 13. Combined with the water spray structure, it forms a dual enhanced heat dissipation of water cooling + air cooling, accelerating the evaporation of moisture on the surface of the heat dissipation fins 12 and the heat exchange of air convection, further improving the external heat dissipation speed, enabling the heat dissipation fins 12 to cool down quickly, and ensuring efficient and coordinated internal and external heat dissipation.

[0047] like Figure 7 and Figure 8 As shown, during this process, the moving block 25 and the limiting groove 26 limit the movement trajectory of the first connecting rod 24 and the second connecting rod 27, ensuring that the overall rotating mechanism runs smoothly without jamming or deviation, and ensuring that the water spray pipe 17 swings accurately and reliably, covering all the heat dissipation fins 12.

[0048] like Figure 1 , Figure 2 and Figure 5 As shown, when the transformer is stopped or in a low-load, low-temperature state, the temperature sensor 7 detects that the oil temperature is lower than the preset threshold. The controller 11 automatically shuts down the internal oil circulation mechanism and the external rotating spray mechanism. The transformer body 1 can meet the heat dissipation requirements by relying on the heat dissipation fins 12 on the outside for natural heat dissipation, thus achieving energy-saving operation.

[0049] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oil-immersed circuit transformer with a cooling structure, comprising: The transformer body (1) has heat dissipation fins (12) on its front side, and the heat dissipation fins (12) are arranged in an array, and the heat dissipation fins (12) are symmetrical about the vertical central axis of the transformer body (1). Its characteristic is that it further includes: The transformer body (1) is provided with an internal cooling mechanism for facilitating the heat dissipation of the internal iron core winding assembly (6). The cooling mechanism is composed of an oil inlet (3), a bend assembly (4), and a nozzle (5). The transformer body (1) is also provided with a partition plate (2). The outer side of the transformer body (1) is provided with a rotating mechanism for spraying heat dissipation on the heat dissipation fins (12). The rotating mechanism is composed of a turntable (21), a connecting block (23), a first connecting rod (24), a moving block (25), a limiting groove (26), a second connecting rod (27), and a servo motor (28). The front side of the transformer body (1) is provided with a mounting frame (16), and the mounting frame (16) is symmetrical about the vertical central axis of the transformer body (1).

2. The oil-immersed circuit transformer with a cooling structure according to claim 1, characterized in that: The partition plate (2) has an oil inlet (3) inside, and the oil inlets (3) are arranged in an array. The lower side of the oil inlet (3) is fixedly connected to one end of the bend assembly (4), and the other end of the bend assembly (4) is provided with a nozzle (5).

3. An oil-immersed circuit transformer with a cooling structure according to claim 2, characterized in that: The bending tube assembly (4) is symmetrical about the vertical central axis of the iron core winding assembly (6), and the iron core winding assembly (6) is located on the lower side of the partition plate (2), and a temperature sensor (7) is located on the lower inner side of the transformer body (1).

4. An oil-immersed circuit transformer with a cooling structure according to claim 3, characterized in that: The lower side of the transformer body (1) is fixedly connected to the recovery pipe (8), and the right side of the recovery pipe (8) is fixedly connected to the oil circulation tank (9). The upper side of the oil circulation tank (9) is fixedly connected to the conveying pipe (10), and the left side of the conveying pipe (10) is fixedly connected to the right side of the transformer body (1). A controller (11) is provided on the front side of the oil circulation tank (9).

5. An oil-immersed circuit transformer with a cooling structure according to claim 1, characterized in that: The upper side of the transformer body (1) is provided with a jet pipe (13), and the lower side of the jet pipe (13) is provided with a jet head (14). The jet heads (14) are arranged in an array. The jet pipe (13) is fixedly connected to the gas supply pipe (15). The jet pipe (13) is symmetrical about the vertical central axis of the transformer body (1).

6. An oil-immersed circuit transformer with a cooling structure according to claim 1, characterized in that: The mounting bracket (16) is rotatably connected to a water spray pipe (17), and a water spray head (18) is provided on the lower side of the water spray pipe (17). The water spray heads (18) are arranged in an array, and the water spray pipe (17) and the water supply pipe (19) are rotatably connected by a seal.

7. An oil-immersed circuit transformer with a cooling structure according to claim 6, characterized in that: The water supply pipe (19) is fixedly connected to the support frame (20), and the water spray pipe (17) is symmetrical about the vertical central axis of the transformer body (1), and the left side of the water spray pipe (17) is fixedly connected to the turntable (21).

8. An oil-immersed circuit transformer with a cooling structure according to claim 7, characterized in that: The turntable (21) has a slot (22) inside, and the slot (22) is slidably connected to the connecting block (23), and the connecting block (23) is rotatably connected to the first connecting rod (24), and the first connecting rod (24) is rotatably connected to the second connecting rod (27).

9. An oil-immersed circuit transformer with a cooling structure according to claim 8, characterized in that: The first connecting rod (24) is rotatably connected to the moving block (25), and the moving block (25) is slidably connected to the limiting groove (26), and the limiting groove (26) is fixedly connected to the transformer body (1). The turntable (21), the slot (22), the connecting block (23), the first connecting rod (24), the moving block (25), the limiting groove (26), the second connecting rod (27), and the servo motor (28) are all in one-to-one correspondence.

10. An oil-immersed circuit transformer with a cooling structure according to claim 8, characterized in that: The second connecting rod (27) is fixedly connected to the output shaft of the servo motor (28), and the servo motor (28) is fixedly connected to the left side of the transformer body (1).

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