Transformer noise reduction device

Abstract

The invention discloses a transformer noise reduction device, which belongs to the technical field of transformers and is characterized in that a counterweight mechanism and an adjusting mechanism are arranged, a guide shaft guides a mounting cylinder to slide along tracks of a first guide groove and a second guide groove, so that the mounting cylinder is dispersed towards the edge of a bottom table, and the mounting cylinder is dispersed into different amplitudes; the mass distribution gradient of the bottom table can be adjusted, the effect of covering a wider inherent frequency range is achieved, when the mass distribution of the six mounting cylinders is relatively concentrated, the inherent frequency is low and suitable for avoiding a low-frequency vibration source, and when the mass distribution of the six mounting cylinders is more dispersed, the inherent frequency is high and suitable for avoiding a high-frequency vibration source, the flexibility of the device is improved, and the service life of the device is prolonged. The base frame can adapt to vibration frequency changes under different working conditions, and therefore the purposes of avoiding the vibration fundamental frequency of the transformer body, reducing the vibration amplitude and reducing noise generated by resonance are achieved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and in particular to a transformer noise reduction device. Background Technology

[0002] Transformer noise is a common environmental problem in the operation of power equipment. Its causes are complex and involve multiple physical processes. The location of noise is closely related to the equipment structure. Transformer noise is mainly caused by mechanical vibration and electromagnetic effects, and can be divided into the following four categories: core vibration, winding vibration, cooling system noise, and auxiliary equipment noise. Core vibration, winding vibration, and cooling system noise can be improved by optimizing core materials, improving winding clamping processes, and selecting low-noise fans. However, auxiliary equipment noise is different from the above three types. It is mainly generated by low-frequency vibration. When the vibration frequency of other equipment on the transformer is close to the noise frequency generated by the transformer itself, resonance will occur, resulting in a significant increase in the vibration amplitude of other equipment and a sudden increase in noise. The equipment that comes into frequent contact with the transformer and is most likely to resonate with it is the concrete platform located below the transformer. Existing methods to avoid resonance include installing a floating foundation on the platform to prevent a rigid connection between the transformer and the platform, as well as increasing the weight of the platform to raise its natural frequency and avoid resonance. However, in actual use, when the transformer load is adjusted, if it is desired to change the natural frequency of the base by increasing or decreasing the mass of the base, so that the natural frequency of the base is different from the vibration frequency of the transformer and to avoid resonance, the concrete base structure needs to be removed and recast, which is costly and damages the integrity of the structure. Summary of the Invention

[0003] The purpose of this invention is to address the problem that when adjusting the transformer load, it is necessary to remove and recast the concrete base structure to avoid resonance by increasing or decreasing the mass of the base and changing its natural frequency so that the natural frequency of the base is different from the vibration frequency of the transformer. This is costly and damages the overall integrity of the transformer. Therefore, this invention proposes a transformer noise reduction device.

[0004] To achieve the above objectives, the present invention employs the following technology: a transformer noise reduction device. The equipment includes a transformer platform, on which the transformer body is mounted via an elastic shock absorber. Several counterweights are installed inside the platform, and the counterweights are set in the platform via a counterweight mechanism. The counterweight mechanism includes several mounting cylinders that are slidably set in the platform, and the mounting cylinders are symmetrically arranged. The counterweights are stacked and inserted through the top openings of the mounting cylinders. By increasing or decreasing the number of counterweights, the natural frequency of the platform's vibration is changed to avoid resonance with the transformer body. The mounting cylinder on the same side slides through an adjustment mechanism set inside the base. The adjustment mechanism includes a guide shaft set on the mounting cylinder and a snap-fit ​​plate set inside the base. The snap-fit ​​plate has at least one first guide groove and at least one inclined second guide groove on each side of the first guide groove. The guide shaft passes through both the first guide groove and the second guide groove. The guide shaft guides the mounting cylinder to slide along the trajectory of the first guide groove and the second guide groove, causing the mounting cylinder to disperse towards the edge of the base platform to avoid the resonance zone of the transformer body.

[0005] As a further description of the transformer noise reduction device described above: The counterweight mechanism also includes a mounting frame mounted on the mounting cylinder. The mounting frame includes side frames mounted on both sides of the mounting cylinder, and a top frame that is rotatably connected to the guide shaft is mounted on the top of the side frames. Additionally, a retainer is provided on the side frame, and each retainer is provided with a connecting cavity. The mounting cylinder that moves along the trajectory of the first guide groove is fixedly mounted with a positioning rail through the connecting cavity, and the connecting cavity provided on the mounting cylinder that moves along the trajectory of the second guide groove is slidably embedded in the positioning rail.

[0006] As a further description of the transformer noise reduction device described above: The inner wall of the mounting cylinder is equipped with a limiting protrusion that cooperates with the counterweight, and observation ports for observing the number of counterweights are opened on both sides of the observation port.

[0007] As a further description of the transformer noise reduction device described above: The adjustment mechanism also includes two mounting cavities symmetrically arranged at the top of the inner wall of the base. The snap-fit ​​plate is set in the mounting cavity. There is a space reserved between the mounting cavity and the top of the inner wall of the base, and the height of the space is the same as the length of the guide shaft.

[0008] As a further description of the transformer noise reduction device described above: The sliding of the mounting cylinder is controlled by a drive mechanism connected to the side frame. The drive mechanism includes at least one threaded rod rotatably disposed in the base, and the two ends of the threaded rod are provided with threads in opposite directions. Additionally, a slide groove is provided on the side frame, a slide table is slidably embedded in the slide groove, and an internal threaded ring that is engaged with the surface of the threaded rod is fixedly installed on the slide table. When the threaded rod rotates, the two internal threaded rings move in opposite directions.

[0009] As a further description of the transformer noise reduction device described above: The bottom of the mounting cylinder is detachably mounted with a base. The bottom of the base is provided with a guide mechanism, which includes at least two rotating cavities opened at the bottom of the base. A rotating seat is rotatably embedded in the rotating cavity, and a load-bearing wheel is rotatably mounted at the bottom of the rotating seat via a hinge shaft.

[0010] As a further description of the transformer noise reduction device described above: The guiding mechanism also includes a first track groove and a second track groove, which are respectively horizontal to the trajectory of the first guide groove and the second guide groove, on the base platform. The load-bearing wheel in the first track groove is vertically arranged, and the load-bearing wheel in the second track groove is inclined.

[0011] As a further description of the transformer noise reduction device described above: The widths of the first and second track grooves are the same as the length of the hinge shaft, and the two ends of the hinge shaft abut against the inner walls of the first and second track grooves, respectively.

[0012] As a further description of the transformer noise reduction device described above: The threaded rod is driven by a power source located in the middle of the base. The power source includes a power distribution cabinet installed on the base. A servo motor is installed on the power distribution cabinet. The servo motor is connected to a steering gear installed on the power distribution cabinet through a reducer. The threaded rod is connected to the output end of the steering gear.

[0013] As a further description of the transformer noise reduction device described above: The steering gear includes a housing mounted on the distribution cabinet. Inside the housing, a worm gear connected to the output end of the reducer and a worm meshing with the worm gear are rotatably arranged. Two threaded rods with opposite thread directions are respectively mounted on both ends of the worm through connecting ends.

[0014] One of the above technical solutions has the following advantages or beneficial effects: 1. Through the set counterweight mechanism and adjustment mechanism, the guide shaft guides the mounting cylinder to slide along the trajectory of the first guide groove and the second guide groove, so that the mounting cylinder is dispersed towards the edge of the base platform. By dispersing the mounting cylinder into different amplitudes, the mass distribution gradient of the base platform can be adjusted to achieve the effect of covering a wider natural frequency range. When the mass distribution of the six mounting cylinders is relatively concentrated, the natural frequency is lower, which is suitable for avoiding low-frequency vibration sources. When the mass distribution of the six mounting cylinders is more dispersed, the natural frequency is higher, which is suitable for avoiding high-frequency vibration sources. This improves the flexibility of the device and enables the base platform to adapt to the vibration frequency changes under different working conditions, thereby avoiding the fundamental frequency of transformer body vibration, reducing the vibration amplitude, and reducing the noise generated by resonance. 2. Through the set drive mechanism, the slide table moves to a position concentric with the threaded rod under the restriction of the slide groove. After the internal threaded ring that is engaged with the threaded rod is installed on the slide table, by rotating the threaded rod, the threaded rod can drive the internal threaded rings on both sides to move in opposite directions at the same time. The mounting cylinders on both sides are simultaneously dispersed or gathered under the drive of the internal threaded rings, thereby avoiding the purpose of asynchronous movement of the mounting cylinders, preventing the center of gravity of the base platform from shifting, and preventing the transformer body set on the base platform from becoming statically tilted. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of a transformer device is shown; Figure 2 A schematic diagram of the first three-dimensional structure of the counterweight mechanism is shown; Figure 3 A schematic diagram of the second three-dimensional structure of the counterweight mechanism is shown; Figure 4 A partial three-dimensional structural schematic diagram of the adjustment mechanism is shown; Figure 5 A three-dimensional structural diagram of multiple counterweight mechanisms connected by an adjustment mechanism is shown. Figure 6 It shows Figure 5 Enlarged structural diagram at point A; Figure 7 A three-dimensional structural diagram of the guide mechanism at the bottom of the counterweight mechanism is shown; Figure 8 It shows Figure 7 Enlarged structural diagram at point B; Figure 9 A partial three-dimensional cross-sectional structural schematic diagram of the guiding mechanism is shown; Figure 10 This diagram shows a top-view cross-sectional view of the structure when multiple counterweight mechanisms are assembled within the base platform. Figure 11 This diagram shows a top-view cross-sectional view of the structure when multiple counterweight mechanisms are dispersed within the base platform. Figure 12 This diagram shows a three-dimensional cross-sectional view of the structure when multiple counterweight mechanisms are assembled within the base platform. Figure 13 This diagram shows a three-dimensional cross-sectional view of the structure when multiple counterweight mechanisms are dispersed within the base platform. Figure 14 A three-dimensional structural schematic diagram of the power source is shown; Figure 15 A frontal cross-sectional view of the steering gear is shown.

[0016] Legend: 10. Transformer equipment; 11. Transformer body; 12. Elastic shock absorber frame; 13. Base platform; 14. Counterweight; 20. Counterweight mechanism; 21. Mounting cylinder; 211. Observation port; 212. Limiting protrusion; 22. Base; 23. Mounting bracket; 231. Side bracket; 232. Retainer; 233. Top bracket; 24. Connecting cavity; 25. Positioning rail; 30. Adjustment mechanism; 31. Guide shaft; 32. Mounting cavity; 33. Snap-fit ​​plate; 34. First guide groove; 35. Second guide groove; 40. Drive mechanism; 41. Slide groove; 42. Slide table; 43. Internal threaded ring; 44. Threaded rod; 50. Guiding mechanism; 51. Rotating cavity; 52. Rotating seat; 53. Hinge shaft; 54. Load-bearing wheel; 55. First track groove; 56. Second track groove; 60. Power source; 61. Distribution cabinet; 62. Servo motor; 63. Reducer; 64. Steering gear; 641. Housing; 642. Worm gear; 643. Worm; 644. Connecting end. Detailed Implementation

[0017] The following will describe in detail, with reference to the accompanying drawings, a transformer noise reduction device according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] To address the issue of high costs and structural integrity associated with altering the natural frequency of a transformer base by increasing or decreasing its mass during load adjustments to prevent resonance, this invention proposes a transformer noise reduction device. This device involves removing and recasting the concrete base, which is necessary. Figure 1 - Figure 15 As shown: The transformer equipment 10 includes a base platform 13. Preferably, the base platform 13 is a frame structure made of hot-rolled H-beam steel Q355B. The transformer body 11 is installed on the base platform 13 through an elastic shock-absorbing frame 12. Several counterweights 14 are provided inside the base platform 13. The counterweights 14 are made of cast iron HT250 to facilitate precise weight adjustment.

[0019] like Figures 2-3As shown, the counterweight 14 is set in the base 13 through the counterweight mechanism 20. The counterweight mechanism 20 includes a plurality of mounting cylinders 21 slidably set in the base 13. Preferably, there are six mounting cylinders 21, three on each side, and the mounting cylinders 21 are symmetrically arranged. The counterweight 14 is stacked and placed in the mounting cylinders 21 through the top opening. The inner wall of the mounting cylinder 21 is provided with a limiting protrusion 212 that cooperates with the counterweight 14. The limiting protrusion 212 restricts the counterweight 14 and prevents the counterweight 14 from being moved in the limiting protrusion 212 due to the vibration generated by the transformer body 11. In order to observe the number of counterweights 14 in the mounting cylinder 21, observation ports 211 are opened on both sides of the observation port 211 to observe the number of counterweights 14. According to the actual working conditions of the transformer body 11, the natural frequency of the vibration of the base 13 is changed by increasing or decreasing the number of counterweights 14 to avoid resonance with the transformer body 11. And a mounting bracket 23 is provided on the mounting cylinder 21. The mounting bracket 23 includes side brackets 231 provided on both sides of the mounting cylinder 21 and retainers 232 provided on the side brackets 231. like Figures 4-5 As shown, the mounting cylinder 21 on the same side slides through the adjustment mechanism 30 provided in the base 13. The adjustment mechanism 30 includes two mounting cavities 32 symmetrically arranged at the top of the inner wall of the base 13. A snap-fit ​​plate 33 is provided in the mounting cavity 32. Preferably, a first guide groove 34 is provided on the snap-fit ​​plate 33, and an inclined second guide groove 35 is provided on each side of the first guide groove 34. A top frame 233 is provided on the top of the side frame 231. After the counterweight 14 is in the correct state, the top frame 233 is used to seal the opening at the top of the mounting cylinder 21. A guide shaft 31 is rotatably mounted on the top frame 233. The guide shafts 31 on the six mounting cylinders 21 pass through the first guide groove 34 and the second guide groove 35 at the corresponding positions. It should be noted that there is a space reserved between the mounting cavity 32 and the top of the inner wall of the base 13. The height of the space is the same as the length of the guide shaft 31, so that the guide shaft 31 can be inserted from above the first guide groove 34 and the second guide groove 35 and rotatably connected to the top frame 233, which facilitates installation and disassembly. To ensure that the three mounting cylinders 21 remain flush during movement, such as Figure 5As shown, each of the retainers 232 is provided with a connecting cavity 24. The mounting cylinder 21 located in the middle and moving along the trajectory of the first guide groove 34 is fixedly mounted with a positioning rail 25 through the connecting cavity 24. The connecting cavities 24 on the mounting cylinders 21 located on both sides and moving along the trajectory of the second guide groove 35 are slidably embedded in the positioning rails 25. When the mounting cylinder 21 in the middle moves, the mounting cylinders 21 on both sides move synchronously under the drive of the positioning rail 25. At the same time, the mounting cylinders 21 on both sides slide horizontally along the length direction of the positioning rail 25 through the connecting cavity 24, thereby ensuring that the mounting cylinders 21 on the same side are flush and avoiding the collision when the mounting cylinders 21 on both sides slide along the second guide groove 35. The guide shaft 31 guides the mounting cylinders 21 to slide along the trajectory of the first guide groove 34 and the second guide groove 35, so that the mounting cylinders 21 are dispersed towards the edge of the base platform 13. By dispersing the mounting cylinders 21 into different amplitudes, the mass distribution gradient of the base platform 13 can be adjusted to achieve the effect of covering a wider natural frequency range. When the mass distribution of the six mounting cylinders 21 is relatively concentrated, the natural frequency is lower, which is suitable for avoiding low-frequency vibration sources. When the mass distribution of the six mounting cylinders 21 is more dispersed, the natural frequency is higher, which is suitable for avoiding high-frequency vibration sources. This improves the flexibility of the device and enables the base platform 13 to adapt to the vibration frequency changes under different working conditions, thereby avoiding the fundamental frequency of the transformer body 11, reducing the vibration amplitude, and reducing the noise generated by resonance.

[0020] Furthermore, such as Figures 5-6 As shown, the sliding of the mounting cylinder 21 is controlled by a drive mechanism 40 connected to the side frame 231. The drive mechanism 40 includes at least one threaded rod 44 rotatably disposed in the base 13. Preferably, there are two threaded rods 44, which are respectively disposed on both sides of the middle mounting cylinder 21. The two ends of the threaded rods 44 are provided with threads in opposite directions. In addition, a slide groove 41 is provided on the side brackets 231 on both sides of the central mounting cylinder 21. A slide table 42 is slidably embedded in the slide groove 41, and an internal thread ring 43 that engages with the surface of the threaded rod 44 is fixedly installed on the slide table 42. When the threaded rod 44 rotates, the two internal thread rings 43 move in opposite directions. By sliding the slide table 42, the slide table 42 is moved to a position concentric with the threaded rod 44 under the restriction of the slide groove 41. After the internal threaded ring 43 that is engaged with the threaded rod 44 is installed on the slide table 42, the threaded rod 44 is rotated so that the threaded rod 44 can drive the internal threaded rings 43 on both sides to move in opposite directions at the same time. The mounting cylinders 21 on both sides are simultaneously dispersed or gathered under the drive of the internal threaded rings 43, thereby achieving the purpose of avoiding asynchronous movement of the mounting cylinders 21, preventing the center of gravity of the base platform 13 from shifting, and preventing the transformer body 11 set on the base platform 13 from becoming statically tilted. Meanwhile, when installation or maintenance work is being carried out, the transformer body 11 is stopped, and the mounting cylinder 21 can be gathered together to reduce the edge space occupied by the mounting cylinder 21 and reduce the risk of mechanical interference with adjacent equipment.

[0021] To ensure that the contact between the mounting cylinder 21 and the base 13 is through rolling friction during movement, and to reduce the torque required for the threaded rod 44 to rotate when adjusting the position of the mounting cylinder 21, such as... Figures 7-9 As shown, a base 22 is detachably installed at the bottom of the mounting cylinder 21. A guide mechanism 50 is provided at the bottom of the base 22. The guide mechanism 50 includes at least two rotating cavities 51 opened at the bottom of the base 22. A rotating seat 52 is rotatably embedded in the rotating cavity 51. A load-bearing wheel 54 is rotatably provided at the bottom of the rotating seat 52 through a hinge shaft 53. In addition, a first track groove 55 and a second track groove 56 are respectively opened on the base platform 13 and are horizontal to the trajectory of the first guide groove 34 and the second guide groove 35. The width of the first track groove 55 and the second track groove 56 is the same as the length of the hinge shaft 53. The two ends of the hinge shaft 53 abut against the inner walls of the first track groove 55 and the second track groove 56 respectively. This design allows the load-bearing wheel 54 to be embedded in the first track groove 55 and the second track groove 56. Simultaneously, the position of the load-bearing wheel 54 is fixed by the hinge shaft 53, which abuts against the first and second track grooves 55 and 56, ensuring its centered position within these grooves. When the mounting cylinder 21 moves under the rotation of the threaded rod 44, the mounting cylinder 21 drives the rotating seat 52 to move via the base 22. The rotating seat 52 then drives the load-bearing wheel 54 to roll within the first and second track grooves 55 and 56 via the hinge shaft 53. It should be noted that the load-bearing wheel 54 in the first track groove 55 is vertically positioned, while the load-bearing wheel 54 in the second track groove 56 is inclined, thereby reducing the driving force required for the movement of the mounting cylinder 21.

[0022] In order to provide a stable torque output to the threaded rod 44, and to ensure the stability of the mounting cylinder 21 after it stops moving, such as Figures 14-15 As shown, the threaded rod 44 is driven by a power source 60 located in the middle of the base 13. The power source 60 includes a power distribution cabinet 61 installed on the base 13. A servo motor 62 is installed on the power distribution cabinet 61. The servo motor 62 is connected to a steering gear 64 installed on the power distribution cabinet 61 through a reducer 63. The threaded rod 44 is connected to the output end of the steering gear 64. The steering gear 64 includes a housing 641 mounted on the distribution cabinet 61. Inside the housing 641, a worm gear 642 connected to the output end of the reducer 63 and a worm 643 meshing with the worm gear 642 are rotatably arranged. Two threaded rods 44 with opposite thread directions are respectively mounted at both ends of the worm 643 through connecting ends 644. By starting the servo motor 62, the torque generated by the servo motor 62 is reduced and increased by the reducer 63 and then output to the worm gear 642. The worm gear 642 drives the worm 643 to rotate, which in turn drives the two threaded rods 44 with opposite thread directions to rotate through the connecting end 644, thereby driving the mounting cylinder 21 to move. After the mounting cylinder 21 moves to the appropriate position, the servo motor 62 is turned off. The self-locking characteristics of the worm gear 642 and the worm 643 are used to stop the mounting cylinder 21 and prevent the mounting cylinder 21 from moving on its own.

[0023] Working principle: The number of initial counterweights 14 inside the installation cylinder 21 is observed and recorded through the observation ports 211 on both sides of the installation cylinder 21. Based on the actual working conditions of the transformer body 11, the vibration natural frequency of the base platform 13 that needs to be changed is analyzed, and then the number of counterweights 14 that need to be added or removed is determined. After adjusting the state of the counterweight 14, install the top frame 233 to seal the opening at the top of the mounting cylinder 21. If it is necessary to add or remove the counterweight 14, first remove the top frame 233, and stack or remove the counterweight 14 as needed through the opening at the top of the mounting cylinder 21. When placing it, use the limiting protrusion 212 set on the inner wall of the mounting cylinder 21 to restrict the counterweight 14 and prevent it from being displaced in the limiting protrusion 212 due to the vibration of the transformer body 11. After adding or removing the counterweight 14, observe and confirm again through the observation port 211 whether the number of counterweight 14 in the mounting cylinder 21 meets the requirements. Slide the slide table 42 so that it moves to a position concentric with the threaded rod 44 under the restriction of the slide groove 41, and install the internal threaded ring 43 that is engaged with the threaded rod 44 on the slide table 42. Start the servo motor 62 installed in the power distribution cabinet 61 on the base 13. The torque generated by the servo motor 62 is reduced and increased by the reducer 63 and then output to the worm wheel 642 of the steering gear 64. The worm wheel 642 drives the worm 643 to rotate. The worm 643 drives the two threaded rods 44 with opposite thread directions to rotate through the connecting end 644. When the threaded rod 44 rotates, the two internal threaded rings 43 move in opposite directions, causing the mounting cylinders 21 on both sides to disperse or converge simultaneously. During this process, the middle mounting cylinder 21 moves along the trajectory of the first guide groove 34, and the two mounting cylinders 21 on both sides move along the trajectory of the second guide groove 35. The two mounting cylinders 21 on both sides slide horizontally along the length direction of the positioning rail 25 through the connecting cavity 24 to ensure that the mounting cylinders 21 on the same side are flush and to avoid collision when the two mounting cylinders 21 slide along the second guide groove 35. At the same time, the load-bearing wheels 54 at the bottom of the mounting cylinder 21 roll in the first track groove 55 and the second track groove 56 to reduce the driving force required for movement. After the mounting cylinder 21 is moved to the appropriate position, the servo motor 62 is turned off. The self-locking characteristics of the worm gear 642 and worm 643 are used to stop the mounting cylinder 21 and prevent it from moving on its own. When installation or maintenance work is being carried out and the transformer body 11 is shut down, the mounting cylinder 21 can be gathered together to reduce the edge space occupied by the mounting cylinder 21 and reduce the risk of mechanical interference with adjacent equipment. The operation steps are the same as the operation of adjusting the position of the mounting cylinder. Simply move the mounting cylinder 21 to the gathered state.

[0024] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the present invention's technology and inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A transformer noise reduction device, comprising a transformer device (10), wherein the transformer device (10) includes a base (13), a transformer body (11) is mounted on the base (13) via an elastic shock-absorbing frame (12), and a plurality of counterweights (14) are provided inside the base (13), characterized in that: The counterweight (14) is set in the base (13) through the counterweight mechanism (20). The counterweight mechanism (20) includes several mounting cylinders (21) that are slidably set in the base (13). The mounting cylinders (21) are all symmetrically arranged. The counterweight (14) is stacked and put in through the top opening of the mounting cylinders (21). By increasing or decreasing the number of counterweights (14), the natural frequency of the vibration of the base (13) is changed to avoid resonance with the transformer body (11). The mounting cylinder (21) on the same side slides through the adjustment mechanism (30) provided in the base (13). The adjustment mechanism (30) includes a guide shaft (31) provided on the mounting cylinder (21) and a snap-fit ​​plate (33) provided in the base (13). The snap-fit ​​plate (33) has at least one first guide groove (34) and at least one inclined second guide groove (35) on both sides of the first guide groove (34). The guide shaft (31) passes through the first guide groove (34) and the second guide groove (35). The guide shaft (31) guides the mounting cylinder (21) to slide along the trajectory of the first guide groove (34) and the second guide groove (35), so that the mounting cylinder (21) is dispersed towards the edge of the base (13) to avoid the resonance zone of the transformer body (11).

2. A transformer noise reduction device according to claim 1, characterized in that, The counterweight mechanism (20) also includes a mounting frame (23) on the mounting cylinder (21). The mounting frame (23) includes side frames (231) on both sides of the mounting cylinder (21). The top of the side frame (231) is provided with a top frame (233) that is rotatably connected to the guide shaft (31). In addition, a retainer (232) is provided on the side frame (231), and a connecting cavity (24) is provided on the retainer (232). The mounting cylinder (21) that moves along the trajectory of the first guide groove (34) is fixedly mounted with a positioning rail (25) through the connecting cavity (24). The connecting cavity (24) provided on the mounting cylinder (21) that moves along the trajectory of the second guide groove (35) is slidably embedded in the positioning rail (25).

3. A transformer noise reduction device according to claim 2, characterized in that, The inner wall of the mounting cylinder (21) is provided with a limiting protrusion (212) that cooperates with the counterweight (14), and observation ports (211) for observing the number of counterweights (14) are provided on both sides of the observation port (211).

4. A transformer noise reduction device according to claim 2, characterized in that, The adjustment mechanism (30) also includes two mounting cavities (32) symmetrically arranged at the top of the inner wall of the base (13). The snap-fit ​​plate (33) is arranged in the mounting cavity (32). There is a space reserved between the mounting cavity (32) and the top of the inner wall of the base (13). The height of the space is the same as the length of the guide shaft (31).

5. A transformer noise reduction device according to claim 2, characterized in that, The sliding of the mounting cylinder (21) is controlled by a drive mechanism (40) connected to the side frame (231). The drive mechanism (40) includes at least one threaded rod (44) rotatably disposed in the base (13). The two ends of the threaded rod (44) are provided with threads in opposite directions. In addition, a slide groove (41) is provided on the side frame (231), a slide table (42) is slidably embedded in the slide groove (41), and an internal thread ring (43) is fixedly installed on the slide table (42) and engaged with the surface of the threaded rod (44). When the threaded rod (44) rotates, the two internal thread rings (43) move in opposite directions.

6. A transformer noise reduction device according to claim 5, characterized in that, The mounting cylinder (21) is detachably mounted with a base (22) at the bottom. The base (22) is provided with a guide mechanism (50) at the bottom. The guide mechanism (50) includes at least two rotating cavities (51) opened at the bottom of the base (22). A rotating seat (52) is rotatably embedded in the rotating cavity (51). A load-bearing wheel (54) is rotatably provided at the bottom of the rotating seat (52) through a hinge shaft (53).

7. A transformer noise reduction device according to claim 6, characterized in that, The guiding mechanism (50) also includes a first track groove (55) and a second track groove (56) on the base (13) that are horizontal to the tracks of the first guide groove (34) and the second guide groove (35), respectively. The load-bearing wheel (54) in the first track groove (55) is vertically arranged, and the load-bearing wheel (54) in the second track groove (56) is inclined.

8. A transformer noise reduction device according to claim 7, characterized in that, The width of the first track groove (55) and the second track groove (56) is the same as the length of the hinge shaft (53), and the two ends of the hinge shaft (53) abut against the inner walls of the first track groove (55) and the second track groove (56) respectively.

9. A transformer noise reduction device according to claim 5, characterized in that, The threaded rod (44) is driven by a power source (60) located in the middle of the base (13). The power source (60) includes a power distribution cabinet (61) installed on the base (13). A servo motor (62) is installed on the power distribution cabinet (61). The servo motor (62) is connected to a steering gear (64) installed on the power distribution cabinet (61) through a reducer (63). The threaded rod (44) is connected to the output end of the steering gear (64).

10. A transformer noise reduction device according to claim 9, characterized in that, The steering gear (64) includes a housing (641) mounted on the distribution cabinet (61). Inside the housing (641) are rotatably arranged a worm gear (642) connected to the output end of the reducer (63) and a worm (643) meshing with the worm gear (642). Two threaded rods (44) with opposite thread directions are respectively mounted at both ends of the worm (643) through connecting ends (644).

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