A power transformer with overheat protection function

Abstract

The present invention relates to the technical field of power transformers, and discloses a power transformer with an overheating protection function, comprising a transformer body, a protective device provided at the front of the transformer body, a knocking device provided at the left side of the transformer body, and a dust pressing device provided at the left side of the transformer body; the protective device comprises a second motor, a second threaded rod, an L-shaped plate, a switch, a fixed block, a trapezoidal guide block, and a mounting block, wherein the second motor is fixedly connected to the top of the transformer body, the second threaded rod is fixedly connected to the output end of the second motor, the L-shaped plate is threadedly connected to the circumferential surface of the second threaded rod, the mounting block is fixedly connected to the front of the transformer body, the switch is installed at the front of the mounting block, and the fixed block is fixedly connected to the left side of the L-shaped plate. In the present invention, when the transformer overheats, it will receive an electrical signal to automatically turn off the switch, so that the power transformer automatically performs power-off protection when it overheats.

Description

Technical Field

[0001] The present invention relates to the technical field of power transformers, in particular to a power transformer with an overheat protection function. Background Art

[0002] The power transformer with overheat protection function is a type of transformer. When the temperature exceeds the threshold, the power transformer with overheat protection function will activate the corresponding protection power-off function, so that the electronic components with excessively high temperature in operation can still be used normally after the power-off protection is passed when the temperature returns to normal.

[0003] The patent with announcement number CN220774087U discloses a dry-type transformer, including a dry-type transformer body, a transformer shell, an air pump and a wind shield; the air pump is connected to the inside of the transformer shell to supply air to the inside of the transformer shell; the wind shield includes a plurality of first wind shields covering the air outlet and a second wind shield covering the air inlet; wherein the upper sides of the plurality of first wind shields are connected in parallel to the outer side wall of the transformer shell through a rotating shaft, and cover the air outlet; the upper sides of the plurality of second wind shields are connected in parallel to the inner side wall of the transformer shell through a rotating shaft, and cover the air inlet. The dry-type transformer of this patent is provided with a plurality of elastic support rods between the dry-type transformer body and the transformer shell to elastically connect the dry-type transformer body and the transformer shell, thereby dispersing the vibration generated during the operation of the dry-type transformer body to the transformer shell, thereby reducing the amplitude of the vibration during the operation of the dry-type transformer body, that is, reducing the working noise.

[0004] However, when the above transformer is overloaded, the temperature inside the power transformer will gradually increase. The excessively high temperature cannot be effectively dissipated, thereby causing damage to the power transformer. Therefore, a power transformer with an overheating protection function is proposed to solve the above problem. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a power transformer with an overheat protection function in view of the above-mentioned deficiencies in the prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a power transformer with overheat protection function, including a transformer body, a protective device is provided at the front of the transformer body, a knocking device is provided at the left side of the transformer body, and a dust pressing device is provided at the left side of the transformer body; the protective device includes a second motor, a second threaded rod, an L-shaped plate, a switch, a fixed block, a trapezoidal guide block, a mounting block, a first fixed plate, a spring telescopic column and a guide block, the second motor is fixedly connected to the top of the transformer body, the second threaded rod is fixedly connected to the output end of the second motor, when the temperature sensor on the transformer body detects that the temperature of the transformer body is too high, the temperature sensor will send an electrical signal to the second motor, when the second motor receives the electrical signal, it will start and drive the second threaded rod to rotate, and at the same time, the second threaded rod drives the L-shaped plate downward through the thread, when the L-shaped plate contacts the switch during the downward movement, the L-shaped plate drives the switch to move downward and close the switch, thereby performing power-off protection on the power transformer, the L-shaped plate is threadedly connected to the circumferential surface of the second threaded rod, The mounting block is fixedly connected to the front of the transformer body, the switch is installed on the front of the mounting block, the fixing block is fixedly connected to the left side of the L-shaped plate, the trapezoidal guide block is fixedly connected to the bottom of the fixing block, the fixing plate 1 is fixedly connected to the front of the mounting block, the number of the spring telescopic columns is provided with two, and the two spring telescopic columns are respectively fixedly connected to the inner wall of the fixing plate 1, the number of the guide blocks is provided with two, and the two guide blocks are respectively fixedly connected to one end of the two spring telescopic columns close to each other, the top of the L-shaped plate is in contact with the bottom of the transformer body, the switch is located on the movement trajectory of the L-shaped plate, when the L-shaped plate moves downward, the fixing block moves downward, so that the fixing block drives the trapezoidal guide block to move downward, when the trapezoidal guide block moves downward, it contacts the guide block through the inclined surface and pushes it to move, so that the guide block pushes the spring telescopic column to retract, when the trapezoidal guide block passes over the guide block, the spring telescopic column drives the guide block to reset and the trapezoidal guide block is stuck in the limit position, preventing the switch from resetting after being pressed down, thereby further protecting the power transformer and preventing fire.

[0007] Preferably, the knocking device includes a fixed column, a second fixed plate, a scraper, a roller, a cam, a round block, a knocking rod, a limit circle, a spring, and a limit block, the scraper is slidably connected to the left side of the transformer body, the second fixed plate is fixedly connected to the left side of the scraper, the number of the fixed columns is provided, and the two fixed columns are fixedly connected to the front and rear sides of the second fixed plate, the motor drives the threaded rod to rotate, and the threaded rod rotates to make the pressing block move downward, and when the pressing block moves downward, the fixed column drives the fixed column to move downward, and when the fixed plate moves downward, the scraper moves downward, so that the scraper moves reciprocatingly to scrape dust on the heat sink, so that the heat sink can better dissipate heat from the power transformer, thereby improving the heat dissipation effect of the heat sink, the circumferential surface of the roller contacts with the right side of the transformer body, the number of the cams is provided, and the two cams are fixedly connected to the front and rear sides of the roller, and the limit block is fixedly connected to the inner wall of the scraper, The number of the knocking rods is provided with two, and the two knocking rods are slidably connected to the inner wall of the limit block, the number of the round blocks is provided with two, and the two round blocks are respectively fixedly connected to the right ends of the two knocking rods, the limiting circle is fixedly connected to the circumferential surface of the knocking rod, the spring is fixedly connected to the left side of the limiting circle, the circumferential surface of the round block contacts with the circumferential surface of the cam, the cam axis is rotatably connected to the inner wall of the scraper, the circumferential surface of the roller contacts with the inner wall of the scraper, the left side of the spring is fixedly connected to the right side of the limiting block, when the scraper moves downward, the roller rotates on the second inner wall of the slide groove, the rotation of the roller drives the cam to rotate, and the rotation of the cam drives the round block to rotate, through the limiting block and the limiting circle, the limiting makes the knocking rod converted from rotational motion to forward and backward movement, and when the knocking rod moves forward, it is limited by the limiting circle, so that the spring is forced to squeeze and retract, so that the knocking rod can repeatedly knock the scraper, so that dust attached to the scraper falls off, further improving the scraping effect of the scraper and making the scraper scrape cleaner.

[0008] Preferably, the ash pressing device includes a motor 1, a fixed plate, a threaded rod 1, a pressing block, a slide block, a U-shaped elastic telescopic rod, an ash pressing plate, and a collection box, the fixed plate is fixedly connected to the left side of the transformer body, the motor 1 is fixedly connected to the top of the fixed plate, the top of the threaded rod 1 is fixedly connected to the output end of the motor 1, the pressing block is threadedly connected to the circumferential surface of the threaded rod 1, the slide block is threadedly connected to the circumferential surface of the threaded rod 1, the U-shaped elastic telescopic rod is slidably connected to the inner wall of the slide block, the ash pressing plate is fixedly connected to the rear part of the U-shaped elastic telescopic rod, the collection box is fixedly connected to the left side of the transformer body, and the bottom of the ash pressing plate is connected to the collection box The inner walls are in contact with each other, the bottom of the pressing block is fixedly connected to the top of the slide block, the right side of the pressing block is in contact with the left side of the transformer body, and there are two ash pressing devices, which are symmetrically distributed on both sides of the transformer body. The pressing block is moved downward by rotating the threaded rod, and the slide block is driven downward when the pressing block moves downward. The U-shaped elastic telescopic rod is moved back and forth left and right by the slide block, and the U-shaped elastic telescopic rod moves back and forth left and right, driving the ash pressing plate to move back and forth left and right, so that the ash pressing plate moves back and forth left and right to flatten and press the dust hung by the scraper after entering the collection box, so as to prevent the dust from splashing out after the scraper hangs on the dust.

[0009] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0010] 1. The power transformer with overheat protection function cooperates with motor 2, threaded rod 2, L-shaped plate, switch, fixed block, trapezoidal guide block, mounting block, fixed plate 1, spring telescopic column, and guide block. When the temperature sensor on the transformer body detects that the temperature of the transformer body is too high, the temperature sensor will send an electrical signal to motor 2. When motor 2 receives the electrical signal, it will start and drive threaded rod 2 to rotate. At the same time, threaded rod 2 drives the L-shaped plate downward through the thread. When the L-shaped plate contacts the switch during the downward movement, the L-shaped plate drives the switch downward and turns off the switch, thereby cutting off the power supply transformer. When the L-shaped plate moves downward, it drives the fixed block downward, causing the fixed block to drive the trapezoidal guide block downward. When the trapezoidal guide block moves downward, it contacts the guide block through the inclined surface and pushes it to move, causing the guide block to push the spring telescopic column to retract. When the trapezoidal guide block passes the guide block, the spring telescopic column drives the guide block to reset and lock the trapezoidal guide block to the limit position, preventing the switch from resetting after being pressed down, thereby further protecting the power transformer and preventing fire.

[0011] 2. The power transformer with overheat protection function operates in coordination with motor 1, fixed plate, threaded rod 1, pressing block, slide block, U-shaped elastic telescopic rod, dust pressing plate, roller, cam, round block, knocking rod, limit circle, spring, and limit block. Motor 1 drives threaded rod 1 to rotate, and the pressing block moves downward through the rotation of threaded rod 1. When the pressing block moves downward, it drives the fixed column to move downward, and the fixed column drives the fixed plate 2 to move downward. When the fixed plate 2 moves downward, it drives the scraper to move downward, so that the scraper moves back and forth to scrape the dust on the heat sink. In addition, the heat sink can better dissipate heat for the power transformer, so that the heat dissipation effect of the heat sink is improved. When the scraper moves downward, the roller rotates on the second inner wall of the slide groove, and the rotation of the roller drives the cam to rotate. The rotation of the cam drives the round block to rotate. Through the limit block and the limit circle, the limit makes the knocking rod convert from rotational motion to forward and backward movement. When the knocking rod moves forward, it is limited by the limit circle, so that the spring is squeezed and stretched under force, so that the knocking rod can repeatedly knock on the scraper, so that the dust attached to the scraper falls off, further improving the scraping effect of the scraper, and making the scraper scrape the dust more cleanly.

[0012] 3. The power transformer with overheat protection function operates through the cooperation between the fixed column, the second fixed plate, the scraper and the collection box. The motor drives the threaded rod to rotate, and the pressing block moves downward through the rotation of the threaded rod. When the pressing block moves downward, the slide block is driven downward to move the U-shaped elastic telescopic rod back and forth. The reciprocating movement of the U-shaped elastic telescopic rod drives the ash pressing plate to move back and forth. The reciprocating movement of the ash pressing plate back and forth will press the dust hanging from the scraper into the collection box to prevent the dust from splashing out after the scraper hangs on. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 This is a schematic structural diagram of the protective device of the present invention;

[0015] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at center A;

[0016] Figure 4 is a cross-sectional view of the protective device of the present invention;

[0017] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at point B in the middle;

[0018] Figure 6 is a cross-sectional view of the striking device of the present invention;

[0019] Figure 7 For the present invention Figure 4Enlarged schematic diagram of the structure at point C in the middle

[0020] Figure 8 It is a schematic diagram of the ash pressing device of the present invention.

[0021] In the figure: 1. Transformer body; 2. Protective device; 201. Motor 2; 202. Threaded rod 2; 203. L-shaped plate; 204. Switch; 205. Fixed block; 206. Trapezoidal guide block; 207. Mounting block; 208. Fixed plate 1; 209. Spring telescopic column; 210. Guide block; 3. Knocking device; 301. Fixed column; 302. Fixed plate 2; 303. Scraper; 304. Roller; 305. Cam; 306. Round block; 307. Knocking rod; 308. Limiting circle; 309. Spring; 310. Limiting block; 4. Ash pressing device; 401. Motor 1; 402. Fixed plate; 403. Threaded rod 1; 404. Pressing block; 405. Slide block; 406. U-shaped elastic telescopic rod; 407. Ash pressing plate; 408. Collection box. DETAILED DESCRIPTION

[0022] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 7One embodiment of the present invention is: a power transformer with an overheat protection function, comprising a transformer body 1, a protective device 2 is provided on the front of the transformer body 1, a knocking device 3 is provided on the left side of the transformer body 1, and an ash pressing device 4 is provided on the left side of the transformer body 1; the protective device 2 includes a second motor 201, a second threaded rod 202, an L-shaped plate 203, a switch 204, a fixed block 205, a trapezoidal guide block 206, a mounting block 207, a first fixed plate 208, a spring telescopic column 209 and a guide block 210, the second motor 201 is fixedly connected to the top of the transformer body 1, the second threaded rod 202 is fixedly connected to the second motor At the output end of 201, when the temperature sensor on the transformer body 1 detects that the temperature of the transformer body 1 is too high, the temperature sensor will send an electrical signal to the motor 201. When the motor 201 receives the electrical signal, it will start and drive the threaded rod 202 to rotate. At the same time, the threaded rod 202 drives the L-shaped plate 203 to move downward through the thread. When the L-shaped plate 203 moves downward and contacts the switch 204, the L-shaped plate 203 drives the switch 204 to move downward and turn off the switch 204, thereby cutting off the power supply transformer. The L-shaped plate 203 is threadedly connected to the circumferential surface of the threaded rod 202, and the mounting block 207 is fixedly connected to the At the front of the transformer body 1, the switch 204 is mounted on the front of the mounting block 207, the fixing block 205 is fixedly connected to the left side of the L-shaped plate 203, the trapezoidal guide block 206 is fixedly connected to the bottom of the fixing block 205, the fixing plate 1 208 is fixedly connected to the front of the mounting block 207, the number of spring telescopic columns 209 is provided with two, and the two spring telescopic columns 209 are respectively fixedly connected to the inner wall of the fixing plate 1 208, the number of guide blocks 210 is provided with two, and the two guide blocks 210 are respectively fixedly connected to the ends of the two spring telescopic columns 209 close to each other, the top of the L-shaped plate 203 is connected to the bottom of the transformer body 1 When the switch 204 is touched, it is located on the movement track of the L-shaped plate 203. When the L-shaped plate 203 moves downward, it drives the fixed block 205 to move downward, so that the fixed block 205 drives the trapezoidal guide block 206 to move downward. When the trapezoidal guide block 206 moves downward, it contacts the guide block 210 through the inclined surface and pushes it to move, so that the guide block 210 pushes the spring telescopic column 209 to retract. When the trapezoidal guide block 206 passes the guide block 210, the spring telescopic column 209 will drive the guide block 210 to reset and the trapezoidal guide block 206 to be stuck in the limit position, preventing the switch 204 from resetting after being pressed down, thereby further protecting the power transformer and preventing the occurrence of fire.

[0024] Working principle: When the temperature sensor on the transformer body 1 detects that the temperature of the transformer body 1 is too high, the temperature sensor will send an electrical signal to the motor 201. When the motor 201 receives the electrical signal, it will start and drive the threaded rod 202 to rotate. At the same time, the threaded rod 202 drives the L-shaped plate 203 to move downward through the thread. When the L-shaped plate 203 moves downward and contacts the switch 204, the L-shaped plate 203 drives the switch 204 to move downward and turn off the switch 204, thereby cutting off the power supply to the power transformer. The L-shaped plate 203 moves to the When moving downward, it drives the fixed block 205 to move downward, so that the fixed block 205 drives the trapezoidal guide block 206 to move downward. When the trapezoidal guide block 206 moves downward, it contacts the guide block 210 through the inclined surface and pushes it to move, so that the guide block 210 pushes the spring telescopic column 209 to retract. When the trapezoidal guide block 206 passes the guide block 210, the spring telescopic column 209 will drive the guide block 210 to reset and lock the trapezoidal guide block 206 to the limit position, preventing the switch 204 from resetting after being pressed down, thereby further protecting the power transformer and preventing the occurrence of fire.

[0025] See also Figure 1-Figure 7On the basis of the above embodiment, in another embodiment of the present invention, the knocking device 3 includes a fixed column 301, a fixed plate 2 302, a scraper 303, a roller 304, a cam 305, a round block 306, a knocking rod 307, a limit circle 308, a spring 309, and a limit block 310. The scraper 303 is slidably connected to the left side of the transformer body 1, and the fixed plate 2 302 is fixedly connected to the left side of the scraper 303. There are two fixed columns 301, and the two fixed columns 301 are respectively fixedly connected to the front and rear sides of the fixed plate 2 302. The motor 1 401 drives the threaded rod 1 403 to rotate, and the pressing block 404 moves downward through the rotation of the threaded rod 1 403, pressing When the block 404 moves downward, it drives the fixed column 301 to move downward, so that the fixed column 301 drives the fixed plate 2 302 to move downward. When the fixed plate 2 302 moves downward, it drives the scraper 303 to move downward, so that the scraper 303 forms a reciprocating movement, scraping the dust on the heat sink so that the heat sink can better dissipate heat for the power transformer. When the dust is scraped off, the heat dissipation effect of the heat sink is improved. The circumferential surface of the roller 304 contacts the right side of the transformer body 1. There are two cams 305, and the two cams 305 are fixedly connected to the front and rear sides of the roller 304. The limit block 310 is fixedly connected to the inner wall of the scraper 303, and the number of the knocking rods 307 is two. The two knocking rods 307 are slidably connected to the inner wall of the limit block 310. There are two round blocks 306, and the two round blocks 306 are fixedly connected to the right ends of the two knocking rods 307 respectively. The limiting circle 308 is fixedly connected to the circumferential surface of the knocking rod 307, and the spring 309 is fixedly connected to the left side of the limiting circle 308. The circumferential surface of the roller 304 contacts the inner wall of the scraper 303, and the left side of the spring 309 is fixedly connected to the right side of the limit block 310. The circumferential surface of the round block 306 contacts the circumferential surface of the cam 305, and the axis of the cam 305 is rotatably connected to the inner wall of the scraper 303. When the dust is scraped off, the heat dissipation effect of the heat sink is improved, and the scraper 30 When moving downward, the roller 304 rotates on the inner wall of the chute of the scraper 303, and the rotation of the roller 304 drives the cam 305 to rotate. The rotation of the cam 305 drives the round block 306 to rotate. The limiting block 310 and the limiting circle 308 limit the knocking rod 307 so that the rotational motion is converted into forward and backward movement. The knocking rod 307 moves forward and is limited by the limiting circle 308 and the limiting block 310 at the same time, so that the spring 309 between the limiting circle 308 and the limiting block 310 is squeezed and stretched, so that the knocking rod 307 can repeatedly knock on the scraper 303, so that the dust attached to the scraper 303 falls off, further improving the scraping effect of the scraper 303 and making the scraper 303 scrape the dust more cleanly.

[0026] The ash pressing device 4 includes a motor 401, a fixed plate 402, a threaded rod 403, a pressing block 404, a slide block 405, a U-shaped elastic telescopic rod 406, an ash pressing plate 407, and a collecting box 408. The fixed plate 402 is fixedly connected to the left side of the transformer body 1, the motor 401 is fixedly connected to the top of the fixed plate 402, the top of the threaded rod 403 is fixedly connected to the output end of the motor 401, the pressing block 404 is threadedly connected to the circumferential surface of the threaded rod 403, the slide block 405 is threadedly connected to the circumferential surface of the threaded rod 403, the U-shaped elastic telescopic rod 406 is slidably connected to the inner wall of the slide block 405, the ash pressing plate 407 is fixedly connected to the rear part of the U-shaped elastic telescopic rod 406, the collecting box 408 is fixedly connected to the left side of the transformer body 1, the bottom of the ash pressing plate 407 is in contact with the inner wall of the collecting box 408, and the bottom of the pressing block 404 is in contact with the inner wall of the collecting box The top of the chute block 405 is fixedly connected, and the right side of the pressing block 404 contacts the left side of the transformer body 1. There are two ash pressing devices 4, and the two ash pressing devices 4 are symmetrically distributed on both sides of the transformer body 1. The motor 1 401 drives the threaded rod 1 403 to rotate, and the pressing block 404 moves downward through the rotation of the threaded rod 1 403. When the pressing block 404 moves downward, it drives the chute block 405 to move downward. When the U-shaped elastic telescopic rod 406 moves downward through the inner wall chute of the chute block 405, the U-shaped elastic telescopic rod 406 slides to the right to form a left and right reciprocating movement. When the U-shaped elastic telescopic rod 406 moves back and forth, it drives the ash pressing plate 407 to move back and forth, so that the ash pressing plate 407 moves back and forth to press the dust hanging on the scraper 303 into the collection box 408 to flatten and compact the dust, so as to prevent the dust from splashing out after the scraper 303 hangs on the dust.

[0027] Working principle: When the power transformer starts to operate, the motor 401 drives the threaded rod 403 to rotate, and the threaded rod 403 drives the pressing block 404 to move downward through the thread. When the pressing block 404 moves downward, it drives the slide block 405 to move downward. When the U-shaped elastic telescopic rod 406 moves downward through the inner wall slide of the slide block 405, the U-shaped elastic telescopic rod 406 slides to the right to form a left and right reciprocating movement. When the U-shaped elastic telescopic rod 406 moves back and forth, it drives the ash pressing plate 407 to move back and forth, so that the ash pressing plate 407 moves back and forth to press the dust hanging down from the scraper 303 into the collecting box 408 to prevent the dust from splashing out after the scraper 303 hangs down. At the same time, the threaded rod 403 is set on the far left, which will not affect the normal operation of the U-shaped elastic telescopic rod 406 when it moves left and right.

[0028] When the pressing block 404 moves downward, it drives the fixed column 301 to move downward, so that the fixed column 301 drives the fixed plate 2 302 to move downward, and when the fixed plate 2 302 moves downward, it drives the scraper 303 to move downward, so that the scraper 303 forms a reciprocating movement and scrapes the dust on the heat sink so that the heat sink can better dissipate heat for the power transformer. When the dust is scraped off, the heat dissipation effect of the heat sink is improved. When the scraper 303 moves downward, the roller 304 rotates on the inner wall of the scraper 303 slot, and the rotation of the roller 304 drives the cam 305 to rotate. The rotation of wheel 305 drives the round block 306 to rotate, and through the limit block 310 and the limit circle 308, the limit causes the knocking rod 307 to be converted from rotational motion to forward and backward movement. The knocking rod 307 moves forward and is limited by the limit circle 308 and the limit block 310 at the same time, so that the spring 309 between the limit circle 308 and the limit block 310 is squeezed and stretched by the force, so that the knocking rod 307 can repeatedly knock on the scraper 303, so that the dust attached to the scraper 303 falls off, further improving the scraping effect of the scraper 303, and making the scraper 303 scrape the dust more cleanly.

[0029] The present invention provides a power transformer with overheat protection. There are many methods and approaches for implementing this technical solution. The above is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A power transformer with an overheat protection function, comprising a transformer body (1), characterized in that: A protective device (2) is provided on the front of the transformer body (1), a knocking device (3) is provided on the left side of the transformer body (1), and an ash pressing device (4) is provided on the left side of the transformer body (1); The protective device (2) includes a second motor (201), a second threaded rod (202), an L-shaped plate (203), a switch (204), a fixed block (205), a trapezoidal guide block (206), a mounting block (207), a first fixed plate (208), a spring telescopic column (209) and a guide block (210), wherein the second motor (201) is fixedly connected to the top of the transformer body (1), the second threaded rod (202) is fixedly connected to the output end of the second motor (201), the L-shaped plate (203) is threadedly connected to the circumferential surface of the second threaded rod (202), and the mounting block (207) is fixedly connected to the front of the transformer body (1). The switch (204) is mounted on the front of the mounting block (207), the fixed block (205) is fixedly connected to the left side of the L-shaped plate (203), the trapezoidal guide block (206) is fixedly connected to the bottom of the fixed block (205), the fixed plate 1 (208) is fixedly connected to the front of the mounting block (207), the number of the spring telescopic columns (209) is two, and the two spring telescopic columns (209) are respectively fixedly connected to the inner wall of the fixed plate 1 (208), the number of the guide blocks (210) is two, and the two guide blocks (210) are respectively fixedly connected to one end of the two spring telescopic columns (209) close to each other; The top of the L-shaped plate (203) and the bottom of the transformer body (1) are in contact with each other, and the switch (204) is located on the movement trajectory of the L-shaped plate (203); The knocking device (3) includes a fixed column (301), a second fixed plate (302), a scraper (303), a roller (304), a cam (305), a round block (306), a knocking rod (307), a limiting circle (308), a spring (309), and a limiting block (310). The scraper (303) is slidably connected to the left side of the transformer body (1). The second fixed plate (302) is fixedly connected to the left side of the scraper (303). There are two fixed columns (301), and the two fixed columns (301) are fixedly connected to the front and rear sides of the second fixed plate (302). The circumferential surface of the roller (304) is aligned with the right side of the transformer body (1). contact with each other, the number of the cams (305) is two, and the two cams (305) are fixedly connected to the front and rear sides of the roller (304), the limit block (310) is fixedly connected to the inner wall of the scraper (303), the number of the knocking rods (307) is two, and the two knocking rods (307) are slidably connected to the inner wall of the limit block (310), the number of the round blocks (306) is two, and the two round blocks (306) are respectively fixedly connected to the right ends of the two knocking rods (307), the limit circle (308) is fixedly connected to the circumferential surface of the knocking rod (307), and the spring (309) is fixedly connected to the left side of the limit circle (308); The circumferential surface of the roller (304) and the inner wall of the scraper (303) are in contact with each other, and the left side of the spring (309) is fixedly connected to the right side of the limit block (310); The circumferential surface of the circular block (306) contacts the circumferential surface of the cam (305), and the axis of the cam (305) is rotatably connected to the inner wall of the scraper (303).

2. The power transformer with overheat protection function according to claim 1, characterized in that: The ash pressing device (4) comprises a motor (401), a fixed plate (402), a threaded rod (403), a pressing block (404), a chute block (405), a U-shaped elastic telescopic rod (406), an ash pressing plate (407), and a collecting box (408). The fixed plate (402) is fixedly connected to the left side of the transformer body (1), the motor (401) is fixedly connected to the top of the fixed plate (402), and the top of the threaded rod (403) is fixedly connected to the left side of the transformer body (1). At the output end of motor 1 (401), the pressing block (404) is threadedly connected to the circumferential surface of threaded rod 1 (403), the chute block (405) is threadedly connected to the circumferential surface of threaded rod 1 (403), the U-shaped elastic telescopic rod (406) is slidably connected to the inner wall of the chute block (405), the ash pressing plate (407) is fixedly connected to the rear of the U-shaped elastic telescopic rod (406), and the collecting box (408) is fixedly connected to the left side of the transformer body (1).

3. The power transformer with overheat protection function according to claim 2, characterized in that: The bottom of the ash pressing plate (407) is in contact with the inner wall of the collecting box (408), and the bottom of the pressing block (404) is fixedly connected to the top of the chute block (405).

4. The power transformer with overheat protection function according to claim 3, characterized in that: The right side of the pressing block (404) contacts the left side of the transformer body (1), and the number of the ash pressing devices (4) is two, and the two ash pressing devices (4) are symmetrically distributed on both sides of the transformer body (1).

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