Autotransformer with overload protection

Abstract

The utility model discloses an autotransformer with overload protection, which belongs to the field of autotransformer protection, and comprises an autotransformer main body, a lifting component arranged outside the autotransformer main body, an adjusting component arranged at the lower end of the lifting component, and a pair of symmetrical heat dissipation components arranged inside the adjusting component, the pair of heat dissipation assemblies is attached to the autotransformer body. According to the technical scheme, the height of an autotransformer body is conveniently adjusted through a lifting assembly, the autotransformer body can be accurately adjusted to an adaptive position in the layout of high-low staggered electrical equipment, a heat dissipation assembly can be tightly attached according to different heating areas of the autotransformer body in cooperation with an adjusting assembly, accurate and efficient heat dissipation is achieved, and meanwhile the height of the autotransformer body can be adjusted to the adaptive position. The spring in the support arm plays a role in buffering and resetting; damage caused by hard collision is avoided, meanwhile, it is ensured that components such as the connecting arm move flexibly and stably, and a reliable buffering protection mechanism is provided for stable operation of equipment under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of autotransformer protection, and in particular to an autotransformer with overload protection. Background Technology

[0002] In modern power systems, autotransformers are an important type of power equipment, widely used in power transmission, distribution, and industrial production. Due to their unique structural design, autotransformers have significant advantages such as material saving, small size, and high efficiency, and can effectively realize voltage transformation and transmission. However, with the continuous growth of electricity demand and the continuous expansion of industrial production scale, overload phenomena frequently occur in autotransformers during operation. When the load current exceeds the rated capacity of the autotransformer, it will cause the internal winding temperature to rise sharply. Excessive temperature will not only accelerate the aging of the winding insulation material, reduce insulation performance, and shorten the service life of the equipment, but may also cause insulation breakdown, resulting in serious electrical accidents and affecting the safe and stable operation of the power system.

[0003] Chinese Patent Application Publication No. CN202323586500.1 discloses an oil-immersed power transformer with a protection device. This solution uses a baffle frame and heat dissipation slots. When heat dissipation is needed inside the protection box, the baffle frame moves downward inside the protection box via a drive unit. The heat dissipation slots on the baffle frame are connected to the heat dissipation slots on the protection box, allowing the heat generated by the equipment connected to the upper end of the transformer body inside the protection box to be discharged outward. However, in the layout of electrical equipment at varying heights, the protection device mentioned in the above patent is not convenient for overload protection of autotransformers in different positions. Moreover, the heat dissipation in the above patent mainly relies on heat dissipation slots, which is a relatively simple heat dissipation method and lacks active adjustment capability. The heat dissipation area of ​​the heat dissipation slots is relatively small, resulting in insufficient natural convection heat dissipation capacity. Furthermore, the heat dissipation slots are open structures, which easily attract dust and debris, affecting the heat dissipation effect.

[0004] Therefore, we propose an autotransformer with overload protection. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide an autotransformer with overload protection. The height of the autotransformer body can be conveniently adjusted via a lifting assembly, allowing for precise adjustment to a suitable position in electrical equipment layouts with varying heights. The adjustment assembly, combined with other components, allows for close contact of heat dissipation components with different heat-generating areas of the autotransformer body, achieving precise and efficient heat dissipation. Simultaneously, springs within the support arm act as buffers and reset mechanisms, preventing damage from hard impacts and ensuring flexible and stable movement of components such as the connecting arm. This provides a reliable buffer protection mechanism for the stable operation of equipment under complex working conditions.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] An autotransformer with overload protection includes an autotransformer body, a lifting assembly externally disposed on the autotransformer body, an adjusting assembly at the lower end of the lifting assembly, and a pair of symmetrical heat dissipation assemblies internally disposed on the adjusting assembly, the pair of heat dissipation assemblies being in contact with the autotransformer body; the lifting assembly includes an n-shaped bracket, a first sliding rod fixedly connected to the upper end of the n-shaped bracket, a lifting frame fitted onto the outer end of the first sliding rod, the lifting frame being slidably connected to the first sliding rod, and a pair of symmetrical connecting frames fixedly connected to the bottom end of the lifting frame, the connecting frames being connected to the adjusting assembly; the adjusting assembly includes a frame fixedly connected to the connecting frames, the inner end of the frame... The sliding connection includes a pair of symmetrical sliding rods. The inner end of the frame has a groove adapted to fit the sliding rods. The pair of sliding rods are connected to a heat dissipation assembly. A movable arm is rotatably connected to the end of each sliding rod away from the groove. A positioning block is rotatably connected to the end of the movable arm away from the sliding rod. The positioning block is fixedly connected to the inner wall of the frame. The heat dissipation assembly includes a connecting strip fixedly connected to the sliding rods. A pair of symmetrical heat sinks are fixedly connected to the inner end of the connecting strip. A pair of symmetrical cooling fans are fixedly connected to the outer end of each heat sink. A fixing plate is fixedly connected to the inner end of each heat sink. Multiple equidistant copper tubes are fixedly connected to the inner end of the fixing plate. One end of each copper tube extends through the fixing plate into the interior of the heat sink.

[0008] The height of the autotransformer body can be adjusted by setting up a lifting component; the adjustment component can adjust the position of the heat dissipation component; the heat sink, cooling fan, and copper pipe in the heat dissipation component work together to dissipate heat from the autotransformer body. Specifically, the n-shaped bracket supports the first slide rod and other components. The first slide rod is slidably connected to the lifting frame, allowing the lifting frame to slide up and down along the first slide rod. The connecting frame is used to connect the lifting frame and the adjustment component. The frame provides a base for the installation and sliding of the slide rod and other components. The slide rod can slide in the slide groove of the frame. The movable arm and positioning block work together to make the movement of the slide rod more flexible and stable. The connecting strip connects the slide rod and the heat sink, etc. The heat sink increases the heat dissipation area, the cooling fan accelerates airflow to enhance the heat dissipation effect, and the fixing plate fixes the copper pipe and other components. The copper pipe can quickly conduct heat.

[0009] Furthermore, a threaded sleeve is fixedly connected to the top of the lifting frame, and the threaded sleeve passes through the bottom of the lifting frame.

[0010] Furthermore, a motor is fixedly connected to the top of the n-shaped bracket, and a first lead screw is fixedly connected to the transmission end of the motor. The bottom end of the first lead screw passes through the bottom end of the threaded sleeve, and the first lead screw is threadedly connected to the threaded sleeve.

[0011] Furthermore, the bottom end of the n-shaped bracket is fixedly connected with a pair of symmetrical fixing feet.

[0012] Furthermore, a mounting bracket is fixedly connected to the inner wall of the frame, and a second lead screw is rotatably connected inside the mounting bracket. A second slide rod is provided below the second lead screw and inside the mounting bracket, and the second slide rod is fixedly connected to the mounting bracket.

[0013] Furthermore, a sleeve block is provided on the outer wall of the second lead screw and the second slide rod. The sleeve block is connected to the second lead screw by a threaded sleeve. The sleeve block is slidably connected to the second slide rod. A positioning frame is fitted in the middle of the second lead screw and the second slide rod. The positioning frame is fixedly connected to the mounting bracket. The positioning frame is fixedly connected to the second slide rod. The positioning frame is rotatably connected to the second lead screw. A worm gear is fitted inside the positioning frame and in the middle of the second lead screw. The worm gear is fixedly connected to the second lead screw.

[0014] Furthermore, a motor is fixedly connected to the outer end of the positioning frame, and a worm is fixedly connected to the transmission end of the motor. The worm passes through the positioning frame and meshes with a worm wheel.

[0015] Furthermore, a connecting block is fixedly connected to the inner end of a pair of sleeve blocks, a support arm is rotatably connected to the inner end of the connecting block, a connecting arm is slidably connected inside the support arm, one end of the connecting arm passes through the inner end of the support arm and is slidably connected to the movable arm, a spring is provided inside the support arm, one end of the spring is fixedly connected to the support arm, and the other end of the spring is fixedly connected to the support arm.

[0016] In summary, this utility model has the following beneficial effects:

[0017] 1. Flexible adjustment of installation height: The height of the autotransformer body can be easily adjusted by the threaded engagement between the first lead screw and the screw sleeve driven by the motor in the lifting assembly. This can meet the diverse needs of equipment installation height in different working scenarios. For example, in the layout of electrical equipment with varying heights, it can be precisely adjusted to the appropriate position, enhancing the flexibility and adaptability of equipment installation.

[0018] 2. Highly efficient and precise heat dissipation adjustment: The adjustment component uses a motor to drive a worm gear transmission, which drives the second lead screw to move the sleeve block and related components, thereby precisely adjusting the position of the heat dissipation component; it can tightly fit the heat dissipation component to different heat-generating areas of the autotransformer body, achieving precise and efficient heat dissipation, greatly improving the heat dissipation effect, ensuring that the equipment can maintain a good heat dissipation state even when running under high load, and extending the service life of the equipment.

[0019] 3. Reliable and stable buffer protection: During the adjustment of the heat dissipation component position, the spring in the support arm plays a buffering and resetting role; in the event of vibration due to adjustment or equipment operation, the spring can alleviate the impact force between components, avoid damage caused by hard collisions, and at the same time ensure that the connecting arm and other components move flexibly and stably, providing a reliable buffer protection mechanism for the stable operation of the equipment under complex working conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in this embodiment;

[0021] Figure 2 This is a schematic diagram of the overall disassembled structure in this embodiment;

[0022] Figure 3 This is a schematic diagram of the lifting component in this embodiment;

[0023] Figure 4 This is a schematic diagram of the adjustment component in this embodiment;

[0024] Figure 5 This is a schematic diagram of the heat dissipation component in this embodiment;

[0025] Figure 6 This is a schematic diagram of the copper tube structure in this embodiment.

[0026] In the diagram, 1. Lifting assembly; 2. Adjustment assembly; 3. Heat dissipation assembly; 4. Autotransformer body; 101. N-type bracket; 102. Fixed foot; 103. First slide rod; 104. Motor; 105. First lead screw; 106. Lifting frame; 107. Screw sleeve; 108. Connecting frame; 201. Frame; 202. Mounting frame; 203. Second lead screw; 204. Second slide rod; 205. Positioning frame; 206. Motor; 207. Worm gear; 208. Worm wheel; 209. Sleeve block; 210. Connecting block; 211. Support arm; 212. Spring; 213. Connecting arm; 214. Positioning block; 215. Movable arm; 216. Slide rod; 301. Connecting strip; 302. Heat sink; 303. Cooling fan; 304. Fixing plate; 305. Copper pipe. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0029] Reference Figures 1-6As shown, this is a preferred embodiment of the present invention of an autotransformer with overload protection, comprising an autotransformer body 4, a lifting assembly 1 disposed on the outside of the autotransformer body 4, an adjusting assembly 2 disposed at the lower end of the lifting assembly 1, and a pair of symmetrical heat dissipation assemblies 3 disposed inside the adjusting assembly 2, the pair of heat dissipation assemblies 3 being in contact with the autotransformer body 4; the lifting assembly 1 includes an n-shaped bracket 101, the upper end of the n-shaped bracket 101 is fixedly connected to a first sliding rod 216103, the outer end of the first sliding rod 216103 is fitted with a lifting frame 106, the lifting frame 106 is slidably connected to the first sliding rod 216103, and the bottom end of the lifting frame 106 is fixedly connected to a pair of symmetrical connecting frames 108, the connecting frames 108 being connected to the adjusting assembly 2; the adjusting assembly 2 includes a frame 201 fixedly connected to the connecting frame 108, the inner end of the frame 201 being slidably connected to the connecting frame 108, the adjusting assembly 2 including ... The frame 201 has a pair of symmetrical sliding rods 216 connected to the heat dissipation assembly 3. The inner end of the frame 201 is provided with a sliding groove adapted to the sliding rods 216. The pair of sliding rods 216 are connected to the heat dissipation assembly 3. The end of the pair of sliding rods 216 away from the sliding groove is rotatably connected to a movable arm 215. The end of the movable arm 215 away from the sliding rods 216 is rotatably connected to a positioning block 214. The positioning block 214 is fixedly connected to the inner wall of the frame 201. The heat dissipation assembly 3 includes a connecting strip 301 fixedly connected to the sliding rods 216. The inner end of the connecting strip 301 is fixedly connected to a pair of symmetrical heat sinks 302. The outer end of the heat sinks 302 is fixedly connected to a pair of symmetrical cooling fans 303. The inner end of the heat sinks 302 is fixedly connected to a fixing plate 304. The inner end of the fixing plate 304 is fixedly connected to a plurality of equidistant copper tubes 305. One end of the copper tubes 305 extends through the fixing plate 304 into the interior of the heat sinks 302.

[0030] The height of the autotransformer body 4 can be adjusted by the lifting component 1; the position of the heat dissipation component 3 can be adjusted by the adjusting component 2; the heat dissipation component 3, including the heat sink 302, cooling fan 303, and copper pipe 305, works together to dissipate heat from the autotransformer body 4. Specifically, the n-shaped bracket supports the first slide rod 216103 and other components. The first slide rod 216103 is slidably connected to the lifting frame 106, allowing the lifting frame 106 to slide up and down along the first slide rod 216103. The connecting frame 108... The frame 201 is used to connect the lifting frame 106 and the adjustment component 2. The frame 201 provides a base for the installation and sliding of components such as the slide rod 216. The slide rod 216 can slide in the slide groove of the frame 201. The movable arm 215 and the positioning block 214 cooperate to make the movement of the slide rod 216 more flexible and stable. The connecting strip 301 connects the slide rod 216 and the heat sink 302, etc. The heat sink 302 increases the heat dissipation area. The cooling fan 303 accelerates the air flow and enhances the heat dissipation effect. The fixing plate 304 fixes the copper pipe 305 and other components. The copper pipe 305 can quickly conduct heat.

[0031] The top end of the lifting frame 106 is fixedly connected to the threaded sleeve 107, which passes through the bottom end of the lifting frame 106.

[0032] The screw sleeve 107 is fixed to the top of the lifting frame 106 and extends through its bottom, providing a threaded connection basis for cooperating with the first lead screw 105 to realize the lifting of the lifting frame 106.

[0033] A motor 104 is fixedly connected to the top of the n-type bracket 101. A first lead screw 105 is fixedly connected to the transmission end of the motor 104. The bottom end of the first lead screw 105 passes through the bottom end of the threaded sleeve 107. The first lead screw 105 is threadedly connected to the threaded sleeve 107.

[0034] The motor 104 provides power to drive the first lead screw 105 to rotate. The first lead screw 105 is threadedly connected to the screw sleeve 107, so that the lifting frame 106 can move up and down along the first lead screw 105, thereby realizing the lifting function.

[0035] The bottom end of the n-type bracket 101 is fixedly connected with a pair of symmetrical fixing feet 102;

[0036] The fixing foot 102 is fixed to the bottom of the n-type bracket, which plays a role in stabilizing and supporting the n-type bracket and the entire device.

[0037] A mounting bracket 202 is fixedly connected to the inner wall of the frame 201. A second lead screw 203 is rotatably connected inside the mounting bracket 202. A second slide rod 216204 is provided below the second lead screw 203 and inside the mounting bracket 202. The second slide rod 216204 is fixedly connected to the mounting bracket 202.

[0038] Mounting bracket 202 is used to mount the second lead screw 203 and the second slide bar 216204. The second lead screw 203 is used to drive the movement of components such as the sleeve block 209, and the second slide bar 216204 provides sliding guidance for the sleeve block 209 to ensure its movement stability.

[0039] The outer walls of the second lead screw 203 and the second slide rod 216204 are provided with sleeve blocks 209. The sleeve blocks 209 are connected to the second lead screw 203 through threaded sleeves 107. The sleeve blocks 209 are slidably connected to the second slide rod 216204. A positioning frame 205 is fitted in the middle of the second lead screw 203 and the second slide rod 216204. The positioning frame 205 is fixedly connected to the mounting bracket 202. The positioning frame 205 is fixedly connected to the second slide rod 216204. The positioning frame 205 is rotatably connected to the second lead screw 203. A worm gear 208 is fitted inside the positioning frame 205 and in the middle of the second lead screw 203. The worm gear 208 is fixedly connected to the second lead screw 203.

[0040] The sleeve 209 is connected to the second lead screw 203 and the second slide bar 216204 through the threaded sleeve 107 of the second lead screw 203 and the sliding connection of the second slide bar 216204. It can move horizontally when the second lead screw 203 rotates. The positioning frame 205 plays the role of positioning and supporting the second lead screw 203 and other components. The worm gear 208 is fixedly connected to the second lead screw 203 and can drive the second lead screw 203 to rotate under the action of the worm gear 207.

[0041] A motor 206 is fixedly connected to the outer end of the positioning frame 205, and a worm 207 is fixedly connected to the transmission end of the motor 206. The worm 207 passes through the positioning frame 205 and meshes with the worm wheel 208.

[0042] The motor 206 provides power to drive the worm 207 to rotate. The worm 207 meshes with the worm wheel 208, thereby transmitting power to the worm wheel 208, which in turn drives the second lead screw 203 to rotate, thus driving components such as the sleeve block 209.

[0043] A connecting block 210 is fixedly connected to the inner end of a pair of sleeve blocks 209. A support arm 211 is rotatably connected to the inner end of the connecting block 210. A connecting arm 213 is slidably connected inside the support arm 211. One end of the connecting arm 213 passes through the inner end of the support arm 211 and is slidably connected to the movable arm 215. A spring 212 is provided inside the support arm 211. One end of the spring 212 is fixedly connected to the support arm 211, and the other end of the spring 212 is fixedly connected to the support arm 211.

[0044] The connecting block 210 connects to a pair of sleeve blocks 209. The support arm 211 and the connecting arm 213 work together to realize the position adjustment of the movable arm 215. The spring 212 plays a role in buffering and resetting in the support arm 211, making the movement of components such as the connecting arm 213 more flexible and stable, and at the same time, it can adapt to different adjustment needs to a certain extent.

[0045] Specific implementation process: First, move the entire autotransformer device with overload protection to the predetermined installation position. Use the pair of symmetrical fixing feet 102 at the bottom of the n-type bracket 101 to ensure the device is stably placed on the ground. Next, if it is necessary to adjust the height of the autotransformer body 4, start the motor 104 at the top of the n-type bracket 101. The transmission end of the motor 104 drives the first lead screw 105 to rotate. Since the first lead screw 105 is threadedly connected to the screw sleeve 107 fixed at the top of the lifting frame 106, and the lifting frame 106 is slidably connected to the first slide rod 103, under the action of the threaded transmission, the lifting frame 106 will move up or down along the first slide rod 103, thereby driving the connection... The height of the adjusting component 2 connected to the bracket 108 and the autotransformer body 4 is adjusted until the required height position is reached. Then the motor 104 is turned off. When it is necessary to adjust the position of the heat dissipation component 3, the motor 206 fixed to the outer end of the positioning frame 205 is turned on. The transmission end of the motor 206 drives the worm 207 to rotate. The worm 207 meshes with the worm wheel 208, transmitting power to the worm wheel 208, which in turn drives the second lead screw 203 fixedly connected to the worm wheel 208 to rotate within the mounting bracket 202. The sleeve 209 is connected to the second lead screw 203 through a threaded sleeve and is slidably connected to the second slide rod 204. As the second lead screw 203 rotates, the sleeve 209 will rotate within the second lead screw 203. The second slide bar 204 moves horizontally, and the connecting block 210 fixed at the inner end of the sleeve block 209 moves with the sleeve block 209. The support arm 211 rotatably connected to the inner end of the connecting block 210 moves accordingly. One end of the connecting arm 213 slidably connected inside the support arm 211 passes through the support arm 211 and is slidably connected to the movable arm 215. During this process, the spring 212 inside the support arm 211 plays a role in buffering and adapting to different adjustment degrees. The movement of the movable arm 215 will drive the slide bar 216 rotatably connected to it to slide in the slide groove in the frame 201, thereby realizing the position adjustment of the heat dissipation component 3 fixedly connected to the slide bar 216, so that the heat dissipation component 3 can be tightly attached to the autotransformer body 4 at different positions. On the surface of the location, during the operation of the autotransformer body 4, the heat dissipation component 3 starts to work, the heat sink 302 increases the heat dissipation area, and multiple copper pipes 305, which are equidistantly fixed to the inner end of the fixing plate 304 and extend one end into the interior of the heat sink 302, can quickly conduct the heat generated by the autotransformer body 4 to the heat sink 302. At the same time, a pair of symmetrical cooling fans 303 fixed to the outer end of the heat sink 302 start up, accelerate the air flow, and quickly dissipate the heat on the heat sink 302 into the surrounding environment, thereby achieving efficient heat dissipation of the autotransformer body 4, ensuring its stable operation within the normal temperature range, and effectively avoiding the impact on equipment performance or damage to the equipment due to excessive heat generated by overload.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An autotransformer with overload protection, characterized in that: The system includes an autotransformer body (4), a lifting assembly (1) is provided on the outside of the autotransformer body (4), an adjustment assembly (2) is provided at the lower end of the lifting assembly (1), and a pair of symmetrical heat dissipation assemblies (3) are provided inside the adjustment assembly (2), and the pair of heat dissipation assemblies (3) are in contact with the autotransformer body (4). The lifting assembly (1) includes an n-shaped bracket (101), the upper end of which is fixedly connected to a first slide rod (103), the outer end of which is fitted with a lifting frame (106), the lifting frame (106) being slidably connected to the first slide rod (103), and the bottom end of which is fixedly connected to a pair of symmetrical connecting frames (108), the connecting frames (108) being connected to the adjusting assembly (2). The adjustment assembly (2) includes a frame (201) fixedly connected to the connecting frame (108). A pair of symmetrical slide rods (216) are slidably connected to the inner end of the frame (201). The inner end of the frame (201) is provided with a groove adapted to the slide rods (216). The pair of slide rods (216) are connected to the heat dissipation assembly (3). A movable arm (215) is rotatably connected to the end of the pair of slide rods (216) away from the groove. A positioning block (214) is rotatably connected to the end of the movable arm (215) away from the slide rods (216). The positioning block (214) is fixedly connected to the inner wall of the frame (201). The heat dissipation assembly (3) includes a connecting strip (301) fixedly connected to the slide bar (216). A pair of symmetrical heat sinks (302) are fixedly connected to the inner end of the connecting strip (301). A pair of symmetrical heat dissipation fans (303) are fixedly connected to the outer end of the heat sinks (302). A fixing plate (304) is fixedly connected to the inner end of the heat sinks (302). A plurality of equidistant copper tubes (305) are fixedly connected to the inner end of the fixing plate (304). One end of the copper tubes (305) extends through the fixing plate (304) into the interior of the heat sinks (302).

2. An autotransformer with overload protection according to claim 1, characterized in that: The top end of the lifting frame (106) is fixedly connected to a screw sleeve (107), and the screw sleeve (107) passes through the bottom end of the lifting frame (106).

3. An autotransformer with overload protection according to claim 1, characterized in that: A motor (104) is fixedly connected to the top of the n-type bracket (101), and a first lead screw (105) is fixedly connected to the transmission end of the motor (104). The bottom end of the first lead screw (105) passes through the bottom end of the threaded sleeve (107), and the first lead screw (105) is threadedly connected to the threaded sleeve (107).

4. An autotransformer with overload protection according to claim 1, characterized in that: The bottom end of the n-type bracket (101) is fixedly connected to a pair of symmetrical fixed feet (102).

5. An autotransformer with overload protection according to claim 1, characterized in that: The inner wall of the frame (201) is fixedly connected to a mounting bracket (202), and a second lead screw (203) is rotatably connected inside the mounting bracket (202). A second slide rod (204) is provided below the second lead screw (203) and inside the mounting bracket (202), and the second slide rod (204) is fixedly connected to the mounting bracket (202).

6. An autotransformer with overload protection according to claim 5, characterized in that: The outer walls of the second lead screw (203) and the second slide rod (204) are provided with sleeve blocks (209). The sleeve blocks (209) are connected to the second lead screw (203) by threaded sleeves. The sleeve blocks (209) are slidably connected to the second slide rod (204). A positioning frame (205) is fitted in the middle of the second lead screw (203) and the second slide rod (204). The positioning frame (205) is fixedly connected to the mounting bracket (202). The positioning frame (205) is fixedly connected to the second slide rod (204). The positioning frame (205) is rotatably connected to the second lead screw (203). A worm gear (208) is fitted inside the positioning frame (205) and in the middle of the second lead screw (203). The worm gear (208) is fixedly connected to the second lead screw (203).

7. An autotransformer with overload protection according to claim 6, characterized in that: A motor (206) is fixedly connected to the outer end of the positioning frame (205), and a worm (207) is fixedly connected to the transmission end of the motor (206). The worm (207) passes through the positioning frame (205) and meshes with the worm wheel (208).

8. An autotransformer with overload protection according to claim 6, characterized in that: A connecting block (210) is fixedly connected to the inner end of a pair of sleeve blocks (209). A support arm (211) is rotatably connected to the inner end of the connecting block (210). A connecting arm (213) is slidably connected inside the support arm (211). One end of the connecting arm (213) passes through the inner end of the support arm (211) and is slidably connected to the movable arm (215). A spring (212) is provided inside the support arm (211). One end of the spring (212) is fixedly connected to the support arm (211), and the other end of the spring (212) is fixedly connected to the support arm (211).

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