Up-down split type transformer for offshore wind power main transformer

Abstract

The invention discloses an up-down split type transformer for an offshore wind power main transformer, and relates to the technical field of transformers for offshore wind power, the transformer comprises a windproof assembly, the windproof assembly comprises a transformer body and a cooling system, and protection assemblies are arranged on the outer surfaces of the two sides of the windproof assembly. According to the up-and-down split type transformer for the offshore wind power main transformer, when a ship meteorological instrument detects that a large amount of rainwater is about to fall on the sea, two lower protection plates are both moved downwards to the position parallel to the bottom of a first supporting plate, two upper protection plates are both moved to the top of a cooling system, two air pumps are started, and the two upper protection plates are moved downwards to the position parallel to the bottom of the first supporting plate; the two shielding plates are moved to the positions where the outer surfaces make contact with each other, the two bearing plates, the two shielding plates, the two upper protection plates and the two lower protection plates are matched to form a door-shaped protection frame, then rain shielding is conducted on the up-down split type transformer, and a large amount of rainwater is prevented from corroding the surface of the transformer.

Description

Technical Field

[0001] This invention relates to the field of transformer technology for offshore wind power, specifically a split-type main transformer for offshore wind power. Background Technology

[0002] The 220kV split-type offshore wind power main transformer is a core step-up device designed specifically for offshore wind farm substations. Its key feature is the separation of the main transformer body and cooling system into upper and lower sections, each located on a different floor of the offshore substation. This design adapts to the space constraints, high salt spray corrosion, strong vibrations, and other harsh operating conditions of offshore platforms, achieving efficient voltage boosting, a compact layout, and reliable protection. It is a crucial device for the collection and long-distance transmission of offshore wind power. The 220kV split-type offshore wind power main transformer is a core step-up transformer designed specifically for offshore wind farm substations. Its key feature is the separate upper and lower arrangement of the main transformer body and cooling system, adapting to the harsh offshore conditions and platform space constraints. It undertakes the critical functions of collecting, boosting, and transmitting offshore wind power to onshore.

[0003] In the current process of using the 220k-class split-type offshore wind power main transformer, the transformer is easily damaged by the harsh conditions of high salt spray and high vibration in the marine environment. The existing transformers have insufficient anti-corrosion and shock resistance. When used at sea for a long time, the transformers used in the split-type offshore wind power main transformer are easily damaged by the marine environment.

[0004] Therefore, we propose a split-type transformer for offshore wind power main transformers to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a split-type offshore wind power main transformer to solve the problem mentioned in the background art that split-type offshore wind power main transformers are easily damaged by the marine environment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a split-type offshore wind power main transformer, comprising a windproof component, the windproof component including a transformer body and a cooling system, protective components on both outer surfaces of the windproof component, rainproof components on the top of both protective components, mounting brackets for both protective components, upper protective plates slidably connected to one inner wall of both mounting brackets, lower protective plates slidably connected to the other inner wall of both mounting brackets, and bearing plates for both rainproof components, push rods slidably connected to the inner walls of both bearing plates, with shielding plates fixedly installed on the outer surfaces of both push rods.

[0007] Preferably, toothed racks are fixedly installed on both outer surfaces of the two upper protective plates and the two lower protective plates, and forward and reverse motors are fixedly installed on the outer surfaces of the two mounting brackets by screws. Gears are fixedly connected to the output ends of the two forward and reverse motors. Mounting rods are fixedly connected to the top of the two upper protective plates. A controller is provided on the outer surface of one of the mounting brackets, and a ship weather instrument is also provided on the outer surface of the other mounting bracket.

[0008] Preferably, an air pump is fixedly installed on the top of each of the two bearing plates by screws, and the output ends of the two air pumps are fixedly connected to a connecting pipe. An installation groove is opened on the outer surface of each of the two shielding plates. An electromagnet is coupled to the inner wall of one of the installation grooves, and a plurality of first springs are evenly arranged on the inner wall of the other installation groove. An iron block is fixed between one end of the plurality of first springs.

[0009] Preferably, the windproof component further includes a mounting base plate, on which a second spring is provided near each of the four corners of the top of the mounting base plate, a first support plate is fixed between the tops of the four second springs, a third spring is provided near each of the four corners of the top of the first support plate, a support rod is fixedly connected to the top of each of the four third springs, a fourth spring is provided at the top of each of the four support rods, and a second support plate is fixedly installed between the tops of the four fourth springs. The tops of both the first support plate and the second support plate are provided with multiple water outlet grooves.

[0010] Preferably, the bottom ends of the four second springs are fixedly connected to the top of the mounting base plate, the bottom ends of the four third springs are fixedly connected to the top of the first support plate, and the bottom ends of the four fourth springs are respectively fixedly connected to the top ends of the four support rods.

[0011] Preferably, the outer surface of the cooling system is coupled to the top of the second support plate, the outer surface of the transformer body is coupled to the top of the first support plate, and the cooling system and the transformer body are connected through a sealed pipeline system.

[0012] Preferably, the outer surfaces of the two mounting brackets are fixedly connected to the outer surfaces of the two sides of the second support plate, the two ends of the two upper protective plates extend movably through the outside of the two mounting brackets, and the two ends of the two lower protective plates extend movably through the outside of the two mounting brackets.

[0013] Preferably, four adjacent teeth in each of the eight tooth rows form a group, and the two ends of each group of tooth rows extend movably to the outside of the two mounting brackets, and the two ends of the two gears extend movably to the outside of the two mounting brackets, and the outer surfaces of the two gears mesh with the outer surfaces of the two groups of tooth rows respectively.

[0014] Preferably, the bottoms of the two support plates are fixedly connected to the tops of the two mounting rods, one end of each of the two connecting pipes is fixedly inserted into the interior of the two support plates, and the outer surfaces of the two shielding plates are slidably connected to the inner walls of the two support plates.

[0015] Preferably, the outer surfaces of the two shielding plates extend movably to the outside of the two bearing plates, one end of each of the first springs is fixedly connected to the inner wall of one of the mounting slots, and the outer surface of the iron block slides against the inner wall of one of the mounting slots.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. When the ship's weather instrument detects that a large amount of rain is about to fall at sea, both lower protective plates are moved downwards to a position parallel to the bottom of the first support plate, and both upper protective plates are moved to the top of the cooling system. Two air pumps are started, and the two shielding plates are moved to a position where their outer surfaces are in contact. Through the cooperation between the two support plates, the two shielding plates, the two upper protective plates, and the two lower protective plates, a portal-shaped protective frame is formed, thereby protecting the upper and lower split transformer from rain and preventing a large amount of rainwater from corroding the surface of the transformer. This solves the problem in the existing technology that the upper and lower split offshore wind power main transformer is easily damaged by the marine environment.

[0017] 2. To further improve the stability of the transformer, the transformer body and cooling system are installed separately by the second support plate and the first support plate. By adopting a staggered layout, compact integration and plug-in connection of the transformer, the problems of limited space and inconvenient installation and maintenance on the offshore platform are solved. The setting of four second springs, third springs and fourth springs enhances the stability and seismic performance of the first support plate and the second support plate.

[0018] 3. When encountering rainy weather, when rainwater falls onto the surfaces of the first and second support plates, it will quickly flow into the interior of multiple water outlet channels under its own gravity and flow outward along the channels. This prevents a large amount of rainwater from accumulating on the support structure of the split-type offshore wind power main transformer, which would increase the weight of the support structure and reduce its stability. Attached Figure Description

[0019] Figure 1 This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 2 This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 3 This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 4This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 5 This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 6 This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 7 This is a perspective view of a split-type offshore wind power main transformer according to the present invention. Figure 8 This is a perspective view of a split-type offshore wind power main transformer according to the present invention.

[0020] In the picture: 1. Windproof Components; 101. Mounting Base Plate; 102. Second Spring; 103. First Support Plate; 104. Third Spring; 105. Support Rod; 106. Fourth Spring; 107. Second Support Plate; 108. Water Outlet Tank; 109. Transformer Body; 110. Cooling System; 2. Protective Components; 201. Mounting Frame; 202. Upper Protective Plate; 203. Lower Protective Plate; 204. Gear Row; 205. Forward and Reverse Motor; 206. Gear; 207. Mounting Rod; 208. Controller; 209. Marine Weather Instrument; 3. Rainproof Components; 301. Bearing Plate; 302. Air Pump; 303. Connecting Pipe; 304. Push Rod; 305. Baffle Plate; 306. Mounting Slot; 307. Electromagnet; 308. First Spring; 309. Iron Block. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-2 and Figures 4-8This invention provides a technical solution: a split-type offshore wind power main transformer, including a windproof component 1, which includes a transformer body 109 and a cooling system 110. Protective components 2 are provided on both outer surfaces of the windproof component 1, and rainproof components 3 are provided on the top of each of the two protective components 2. Each of the two protective components 2 includes a mounting bracket 201. An upper protective plate 202 is slidably connected to one inner wall of each mounting bracket 201, and a lower protective plate 203 is slidably connected to the other inner wall of each mounting bracket 201. Each of the two rainproof components 3 includes a support plate 301, and a pusher is slidably connected to the inner wall of each support plate 301. The outer surfaces of the rods 304 and the two push rods 304 are fixedly equipped with baffles 305. The outer surfaces of the two upper protective plates 202 and the two lower protective plates 203 are fixedly equipped with gear racks 204. The outer surfaces of the two mounting brackets 201 are fixedly equipped with forward and reverse motors 205 by screws. Gears 206 are fixedly connected to the output ends of the two forward and reverse motors 205. Mounting rods 207 are fixedly connected to the tops of the two upper protective plates 202. A controller 208 is installed on the outer surface of one mounting bracket 201, and a ship weather instrument 209 is also installed on the outer surface of another mounting bracket 201. The tops of the two support plates 301 are fixedly equipped with screws... An air pump 302 is fixedly installed, and the output ends of both air pumps 302 are fixedly connected to a connecting pipe 303. The outer surfaces of both baffles 305 are provided with mounting grooves 306. An electromagnet 307 is coupled to the inner wall of one mounting groove 306, and multiple first springs 308 are evenly arranged on the inner wall of the other mounting groove 306. An iron block 309 is fixed between one end of each of the multiple first springs 308. Four adjacent teeth in each of the eight tooth rows 204 form a group, and both ends of each group of tooth rows 204 extend movably through to the outside of the two mounting brackets 201. The two ends of the two gears 206 also extend movably through to the outside of the two mounting brackets 201. The outer surface of the gear 206 meshes with the outer surfaces of the two sets of gear racks 204 respectively. The bottoms of the two bearing plates 301 are fixedly connected to the tops of the two mounting rods 207 respectively. One end of the two connecting pipes 303 is fixedly inserted into the interior of the two bearing plates 301 respectively. The outer surfaces of the two baffle plates 305 are slidably connected to the inner walls of the two bearing plates 301 respectively. The outer surfaces of the two baffle plates 305 are movably inserted into the exterior of the two bearing plates 301 respectively. One end of each of the multiple first springs 308 is fixedly connected to the inner wall of one of the mounting grooves 306. The outer surface of the iron block 309 slides against the inner wall of one of the mounting grooves 306.

[0023] In this embodiment, due to the unpredictable weather at sea and the high rainfall, coupled with the evaporation of marine droplets and the circulation of atmospheric salt spray, high-salinity rainwater is easily generated. This high-salinity rainwater damages the transformer structure through a combination of direct erosion and electrochemical corrosion. When the ship's weather instrument 209 detects an imminent heavy rainfall at sea, it transmits a signal to the controller 208. The ship's weather instrument 209 integrates a rain sensor and multiple meteorological parameter monitoring to achieve rain detection and wind / rain warning linkage. It incorporates a piezoelectric raindrop sensor, utilizing the piezoelectric effect of the material; when raindrops strike the sensor surface, they generate an electric charge. The amount of charge is used to calculate the precipitation intensity, identifying early rainfall signals such as light rain and other rainfall amounts. The instrument has a simple structure and is resistant to salt spray corrosion. The controller 208 activates two forward and reverse motors 205, which drive two gears 206 to rotate, thereby driving... The corresponding gear rack 204 moves, causing the two upper protective plates 202 to move upwards with the rotation of the two gears 206, and the two lower protective plates 203 to move downwards with the rotation of the two gears 206, until both lower protective plates 203 move downwards to a position parallel to the bottom of the first support plate 103. At this point, both upper protective plates 202 move to the top of the cooling system 110, and the two forward and reverse motors 205 can be shut off by the controller 208. Both forward and reverse motors 205 have a self-locking function, which is a mature existing technology and will not be described in detail here. Then, the controller 208 starts the two air pumps 302, causing the two connecting pipes 303 to respectively deliver gas into the interior of the two support plates 301, thereby causing the two push rods 304 to move forward under the pressure of the gas. For example... Figure 7As shown, the cross-section of the push rod 304 is cross-shaped and corresponds to the internal cross-section of the support plate 301. This serves to limit the movement of the push rod 304 while facilitating its movement. Furthermore, both ends of the slot where the push rod 304 contacts the support plate 301 are closed to prevent the push rod 304 from moving out of the support plate 301. As the two push rods 304 move, they push their corresponding two baffle plates 305 towards each other. When the two baffle plates 305 reach the position where their outer surfaces contact each other, the electromagnet 307 is electrically connected to an external power source, generating a magnetic field that attracts the corresponding iron block 309. The iron block 309 is then attracted by the magnetic field. The attraction causes the iron block 309 to move along the inner wall of the corresponding mounting slot 306 towards the outer surface of the electromagnet 307 until the outer surface of the iron block 309 is tightly attached to the outer surface of the electromagnet 307. At this point, the multiple first springs 308 are stretched by the tension, thus achieving the connection between the two support plates 301. Through the cooperation between the two support plates 301, the two shielding plates 305, the two upper protective plates 202, and the two lower protective plates 203, a portal-shaped protective frame is formed, which in turn protects the upper and lower split transformer from rain, preventing a large amount of rainwater from corroding the surface of the transformer. This solves the problem in the prior art that the upper and lower split offshore wind power main transformer is easily damaged by the marine environment.

[0024] like Figures 1-3 As shown, the windproof component 1 also includes a mounting base plate 101. Second springs 102 are installed on the top of the mounting base plate 101 near its four corners. A first support plate 103 is fixed between the tops of the four second springs 102. Third springs 104 are installed on the top of the first support plate 103 near its four corners. Support rods 105 are fixedly connected to the tops of the four third springs 104. Fourth springs 106 are installed at the tops of the four support rods 105. A second support plate 107 is fixedly installed between the tops of the four fourth springs 106. Multiple water outlet grooves 108 are provided on the tops of both the first support plate 103 and the second support plate 107. The bottom ends of the four second springs 102 are fixedly connected to the top of the mounting base plate 101. The bottom ends of the third springs 104 are fixedly connected to the top of the first support plate 103, the bottom ends of the four fourth springs 106 are fixedly connected to the top ends of the four support rods 105 respectively, the outer surface of the cooling system 110 is coupled to the top of the second support plate 107, the outer surface of the transformer body 109 is coupled to the top of the first support plate 103, the cooling system 110 and the transformer body 109 are connected by a sealed pipeline system, the outer surfaces of the two mounting brackets 201 are fixedly connected to the outer surfaces of the two sides of the second support plate 107 respectively, the two ends of the two upper protective plates 202 are movable through to the outside of the two mounting brackets 201 respectively, and the two ends of the two lower protective plates 203 are movable through to the outside of the two mounting brackets 201 respectively.

[0025] In this embodiment, to further improve the stability of the split-type offshore wind power main transformer during offshore use, the transformer is divided into a transformer body 109 and a cooling system 110, which are installed separately via a second support plate 107 and a first support plate 103. This staggered layout, compact integration, and plug-in connection of the transformer solves the problems of limited space and inconvenient installation and maintenance on offshore platforms. Simultaneously, the arrangement of four second springs 102, a third spring 104, and a fourth spring 106 enhances the stability and seismic performance of the first support plate 103 and the second support plate 107. 02. Dampers are installed inside the third spring 104 and the fourth spring 106 to ensure stability. When encountering rainy weather, in order to quickly discharge the rainwater that remains on the surface of the first support plate 103 and the second support plate 107 and ensure the stability of the transformer operation, when rainwater falls on the surface of the first support plate 103 and the second support plate 107, it will quickly flow into the interior of multiple water outlet channels 108 under its own gravity and flow outward along the water outlet channels 108. This prevents a large amount of rainwater from remaining on the support structure of the split-type offshore wind power main transformer, which would increase the weight of the support structure and reduce its stability.

[0026] The usage and working principle of this device are as follows: When the ship's weather instrument 209 detects that a large amount of rain is about to fall at sea, it transmits a signal to the controller 208. The controller 208 then activates two forward and reverse motors 205, which drive two gears 206 to rotate, thereby driving the corresponding gear racks 204 to move. This causes the two upper protective plates 202 to move upwards with the rotation of the gears 206, and the two lower protective plates 203 to move downwards with the rotation of the gears 206, until both lower protective plates 203 have moved downwards to a position parallel to the bottom of the first support plate 103. At this point, both upper protective plates 202 have moved to the top of the cooling system 110. The controller 208 can shut down the two forward and reverse motors 205, and then start the two air pumps 302, causing the two connecting pipes 303 to deliver gas into the two support plates 301 respectively. This causes the two push rods 304 to move forward under the pressure of the gas. As the two push rods 304 move, they push the two corresponding baffles 305 to move towards each other. When the two baffles 305 move to the position where their outer surfaces are in contact, the electromagnet 307 can be electrically connected to an external power source to generate a magnetic field, thereby generating an attraction force on the corresponding iron block 309. Under the influence of the magnetic attraction, the iron block 309 moves along its corresponding mounting groove 301. The inner wall of 6 moves towards the outer surface of the electromagnet 307 until the outer surface of the iron block 309 is tightly attached to the outer surface of the electromagnet 307, and the multiple first springs 308 are stretched by tension, thus realizing the connection between the two support plates 301. Through the cooperation between the two support plates 301, the two shielding plates 305, the two upper protective plates 202 and the two lower protective plates 203, a portal-shaped protective frame is formed to protect the upper and lower split transformer from rain. By dividing the transformer into the transformer body 109 and the cooling system 110 and installing them separately through the second support plate 107 and the first support plate 103, the staggered layout, compact integration and plug-in connection of the transformer solve the problem of air gaps on the offshore platform. To address the issues of limited space and inconvenient installation and maintenance, the design incorporates four second springs 102, a third spring 104, and a fourth spring 106. These springs enhance the stability and seismic resistance of the first support plate 103 and the second support plate 107. In rainy weather, to quickly drain rainwater from the surfaces of the first support plate 103 and the second support plate 107 and ensure the stability of the transformer operation, rainwater falling onto these surfaces will quickly flow into the interior of multiple water outlet channels 108 under its own gravity, and then flow outwards along the channels. This prevents a large amount of rainwater from accumulating on the support structure of the split-type offshore wind power main transformer.

[0027] The wiring diagrams of the transformer body 109, cooling system 110, forward and reverse motor 205, controller 208, marine weather instrument 209, air pump 302, and electromagnet 307 in this invention are common knowledge in the field, and their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control methods and wiring layouts of the transformer body 109, cooling system 110, forward and reverse motor 205, controller 208, marine weather instrument 209, air pump 302, and electromagnet 307 will not be explained in detail.

[0028] 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. A split-type offshore wind power main transformer, comprising a windproof component (1), wherein the windproof component (1) includes a transformer body (109) and a cooling system (110), and protective components (2) are provided on both outer surfaces of the windproof component (1), and rainproof components (3) are provided on the top of both protective components (2), characterized in that: Both of the protective components (2) include a mounting bracket (201), an upper protective plate (202) is slidably connected to one inner wall of each of the two mounting brackets (201), and a lower protective plate (203) is slidably connected to the other inner wall of each of the two mounting brackets (201). Both of the rainproof components (3) include a support plate (301), and the inner walls of the two support plates (301) are slidably connected with push rods (304), and the outer surfaces of the two push rods (304) are fixedly installed with shields (305).

2. The split-type offshore wind power main transformer according to claim 1, characterized in that: A gear rack (204) is fixedly installed on both sides of the outer surfaces of the two upper protective plates (202) and the two lower protective plates (203). A forward and reverse motor (205) is fixedly installed on the outer surface of the two mounting brackets (201) by screws. A gear (206) is fixedly connected to the output end of the two forward and reverse motors (205). A mounting rod (207) is fixedly connected to the top of the two upper protective plates (202). A controller (208) is set on the outer surface of one of the mounting brackets (201). A ship weather instrument (209) is also set on the outer surface of one of the mounting brackets (201).

3. The split-type offshore wind power main transformer according to claim 2, characterized in that: The tops of the two support plates (301) are fixedly mounted with air pumps (302) by screws. The output ends of the two air pumps (302) are fixedly connected to the connecting pipes (303). The outer surfaces of the two shields (305) are provided with mounting grooves (306). An electromagnet (307) is coupled to the inner wall of one of the mounting grooves (306). A plurality of first springs (308) are evenly arranged on the inner wall of the other mounting groove (306). An iron block (309) is fixed between one end of the plurality of first springs (308).

4. The split-type offshore wind power main transformer according to claim 3, characterized in that: The windproof component (1) also includes a mounting base plate (101). The top of the mounting base plate (101) is provided with a second spring (102) near the four corners. A first support plate (103) is fixed between the tops of the four second springs (102). A third spring (104) is provided near the four corners of the top of the first support plate (103). A support rod (105) is fixedly connected to the top of each of the four third springs (104). A fourth spring (106) is provided at the top of each of the four support rods (105). A second support plate (107) is fixedly installed between the tops of the four fourth springs (106). Multiple water outlet grooves (108) are opened on the tops of the first support plate (103) and the second support plate (107).

5. The split-type offshore wind power main transformer according to claim 4, characterized in that: The bottom ends of the four second springs (102) are fixedly connected to the top of the mounting base plate (101), the bottom ends of the four third springs (104) are fixedly connected to the top of the first support plate (103), and the bottom ends of the four fourth springs (106) are fixedly connected to the top of the four support rods (105).

6. The split-type offshore wind power main transformer according to claim 5, characterized in that: The outer surface of the cooling system (110) is coupled to the top of the second support plate (107), the outer surface of the transformer body (109) is coupled to the top of the first support plate (103), and the cooling system (110) and the transformer body (109) are connected by a sealed pipeline system.

7. The split-type offshore wind power main transformer according to claim 6, characterized in that: The outer surfaces of the two mounting brackets (201) are fixedly connected to the outer surfaces of the two sides of the second support plate (107), and the two ends of the two upper protective plates (202) extend movably through to the outside of the two mounting brackets (201), and the two ends of the two lower protective plates (203) extend movably through to the outside of the two mounting brackets (201).

8. The split-type offshore wind power main transformer according to claim 7, characterized in that: The eight tooth rows (204) are arranged in groups of four adjacent to each other. The two ends of each group of tooth rows (204) extend movably through to the outside of the two mounting brackets (201). The two ends of the two gears (206) extend movably through to the outside of the two mounting brackets (201). The outer surfaces of the two gears (206) mesh with the outer surfaces of the two groups of tooth rows (204).

9. The split-type offshore wind power main transformer according to claim 8, characterized in that: The bottoms of the two support plates (301) are fixedly connected to the tops of the two mounting rods (207), one end of the two connecting pipes (303) is fixedly inserted into the interior of the two support plates (301), and the outer surfaces of the two shielding plates (305) are slidably connected to the inner walls of the two support plates (301).

10. The split-type offshore wind power main transformer according to claim 9, characterized in that: The outer surfaces of the two baffles (305) extend movably through the outside of the two support plates (301), and one end of each of the first springs (308) is fixedly connected to the inner wall of one of the mounting grooves (306). The outer surface of the iron block (309) slides against the inner wall of one of the mounting grooves (306).

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