Wind power cabin transformer

Abstract

Brackets of the wind power cabin transformer are connected through bolt structures, busbars of the wind power cabin transformer are connected through bolt structures, an anti-loosening device is arranged on the outer side of each bolt structure, and each anti-loosening device comprises an upper layer plate and a lower layer plate. The upper-layer plate and the lower-layer plate are respectively provided with a width adjusting mechanism, and the upper-layer plate and the lower-layer plate are connected through a distance self-adaptive connecting mechanism. The nut of the bolt structure is completely limited and fixed through the upper layer plate and the lower layer plate, so that the bolt cannot rotate, and the problem that the bolt falls off due to vibration is eradicated.

Description

Technical Field

[0001] The present invention relates to a transformer, in particular to a wind turbine nacelle transformer, belonging to the technical field of transformers. Background Art

[0002] The wind turbine nacelle transformer is one of the core components of an offshore wind power generation device. Since offshore wind power generation mainly relies on the rotation of the fan blades to drive the generator to generate electricity, and the wind turbine nacelle transformer is arranged in the wind turbine nacelle at the rear end of the fan blades. Due to being very close to the fan blades and located at the uppermost position of the wind power pipe pile, when the fan blades rotate to generate electricity, the wind turbine nacelle will inevitably generate relatively severe vibrations. Many frames and busbars of the wind turbine nacelle transformer need to be connected and fixed by bolts, and the vibrations of the wind turbine nacelle will cause the bolts at these connection parts to loosen. Once the structure loosens to the point where it cannot maintain the stability of the transformer connection structure, it is likely to cause damage to the transformer and the entire wind power device system. Currently, in order to alleviate the bolt loosening caused by such vibrations, structures such as double self-locking gaskets and double self-locking nuts are usually adopted. Although this alleviates the problem of bolt detachment caused by vibrations to a certain extent, these measures still cannot completely solve the problem of bolt loosening caused by relatively severe vibrations. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a wind turbine nacelle transformer to solve the problem of bolt loosening of the wind turbine nacelle transformer.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: A wind turbine nacelle transformer, the brackets of the wind turbine nacelle transformer are connected by a bolt structure, the busbars of the wind turbine nacelle transformer are connected by a bolt structure, and an anti-loosening device is arranged outside the bolt structure. The anti-loosening device includes an upper plate and a lower plate. The upper plate and the lower plate are respectively provided with a width adjustment mechanism, and the upper plate and the lower plate are connected by a spacing adaptive connection mechanism.

[0005] Further, 6 nut locking mechanisms are arranged on the lower side surface of the upper plate. The 6 nut locking mechanisms are divided into two groups and symmetrically arranged on the upper and lower sides of the lower side surface of the upper plate. Each nut locking mechanism includes a locking block, an elastic conical ring, an external gear ring and a rack. The locking block is integrally cylindrical. Blind holes matching the locking blocks are opened on the lower side surface of the upper plate corresponding to each locking block. The locking block is rotatably arranged in the blind hole and can rotate along the circumferential direction of the blind hole. An internal hexagonal hole matching the nut is opened on the lower end surface of the locking block. A flared opening is arranged at the lower end of the internal hexagonal hole. A through hole matching the bolt is opened at the upper end of the internal hexagonal hole. The upper end of the locking block is frustum-shaped. The elastic conical ring is fixed on the inner wall of the blind hole at the upper end of the locking block. The external gear ring is sleeved outside the locking block and fixedly connected to the locking block. The external gear ring meshes with the rack.

[0006] Further, a stepped structure is provided at the lower end of the locking block, and a stepped structure matching the lower end of the locking block is also provided at the lower end of the blind hole. The stepped structure at the lower end of the locking block meshes with the stepped structure at the lower end of the blind hole.

[0007] Further, the elastic conical ring is of an annular structure. The inner side of the elastic conical ring arches upward in a conical shape, and the taper of the elastic conical ring matches the taper of the frustum-shaped side surface at the upper end of the locking block. Multiple channels are formed in the inner ring of the elastic conical ring. The channels are arranged along the radial direction of the elastic conical ring, and multiple channels are equally spaced along the circumferential direction of the elastic conical ring.

[0008] Further, two racks are provided. Each rack meshes with the external gear ring of a set of nut locking mechanisms respectively. The racks are slidably arranged in the upper layer plate along the up-and-down direction of the upper layer plate. Sliding plates are provided at both ends of the racks. Rack chutes matching the racks are formed on both sides of the upper layer plate. A rack cavity is provided on one side of the rack chute away from the center of the upper layer plate, and the thickness of the rack cavity is greater than that of the rack chute.

[0009] Further, a rack locking mechanism is respectively provided at both ends of the upper layer plate corresponding to the racks. The rack locking mechanism includes a locking elastic plate and a wedge-shaped buckle. A rectangular hole is formed in the upper layer plate. The locking elastic plate is arranged in the rectangular hole, and one end of the locking elastic plate is fixed at one end of the rectangular hole. The wedge-shaped buckle is fixed at the other end of the locking elastic plate. When the rack slides along the rack chute to mesh with the external gear ring, the wedge-shaped buckle locks and positions the rack.

[0010] Further, among the 6 nut locking mechanisms, 4 nut locking mechanisms located on the left and right sides of the upper layer plate are provided with a spacing adjusting mechanism. The spacing adjusting mechanism includes an adjusting slide plate and an adjusting chute. The adjusting chute is formed on the lower side surface of the upper layer plate along the left-and-right direction. The adjusting slide plate is slidably arranged in the adjusting chute and can slide left and right in the adjusting chute.

[0011] Further, 6 circular concave holes are formed on the upper side surface of the lower layer plate. Among the 6 circular concave holes, 4 circular concave holes located on the left and right sides of the lower layer plate are provided with a spacing adjusting mechanism.

[0012] Further, the width adjusting mechanism includes a plurality of width adjusting rods and a plurality of adjusting rod chutes. The upper layer plate and the lower layer plate are respectively composed of a first layer plate and a second layer plate. The first layer plate and the second layer plate are in the same plane. A plurality of adjusting rod chutes are formed on the side of the first layer plate facing the second side plate, and the adjusting rod chutes are formed along the up-and-down direction of the upper layer plate or the lower layer plate. A plurality of width adjusting rods are arranged along the up-and-down direction of the upper layer plate or the lower layer plate, and one end of each of the plurality of width adjusting rods is fixed on the side of the second layer plate facing the first layer plate. The other ends of the plurality of width adjusting rods are slidably arranged in the plurality of adjusting rod chutes one by one.

[0013] Further, four sets of the spacing adaptive connection mechanisms are provided, and the four sets of spacing adaptive connection mechanisms are respectively located at the four corner positions of the upper layer board and the lower layer board. Each set of spacing adaptive connection mechanism includes a connection pin and a connection pin hole. Four connection pin holes are opened at the four corner positions of the upper layer board. The connection pin includes a cylindrical main body and several groups of tapered barbs. A through groove that equally divides the cylindrical main body into two parts is opened downward at the upper end of the cylindrical main body. Several groups of tapered barbs are evenly distributed on the outer side of the cylindrical main body from top to bottom. Each group of tapered barbs includes two tapered barbs, and the two tapered barbs are symmetrically distributed on the side surface of the cylindrical main body on both sides of the through groove. The connection pin hole is a through hole with an inner diameter matching the maximum outer diameter of the connection pin. A snap ring structure is arranged in the connection pin hole. The inner diameter of the snap ring structure matches the outer diameter of the cylindrical main body. A tapered guide hole structure is arranged at the lower end of the snap ring structure.

[0014] Compared with the prior art, the present invention has the following advantages and effects: 1. The present invention provides a wind turbine nacelle transformer. By using the upper layer board and the lower layer board to completely limit and fix the nuts of the bolt structure, the bolt cannot rotate, thus eradicating the problem that the bolt may fall off due to vibration. 2. The nut locking mechanism of the present invention uses a locking block designed with a rotating structure to lock the nut. In this way, it can be adjusted according to the actual angular position of the nut. After the adjustment is in place, the nut locking mechanism is completely locked and limited by the sliding rack. It is convenient to operate and has good adaptability. 3. The upper and lower widths of the upper layer board and the lower layer board of the present invention can be adjusted. At the same time, the spacing between the nut locking mechanism and the circular concave holes can also be adjusted. In this way, it can be adjusted for the bolt fixing structures at different positions. One set of devices can be used for the nut limitation at different parts of the transformer. It has good applicability and solves the cost of mold opening. 4. The spacing adaptive connection mechanism of the present invention can adaptively adjust to the connection parts of brackets or busbars with different thicknesses. It has strong adaptability, and only direct insertion is required during fixation, and the operation is convenient without relying on tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a wind turbine nacelle transformer of the present invention.

[0016] Figure 2 is a schematic diagram of the anti-loosening device of the present invention.

[0017] Figure 3 is a schematic diagram of the upper layer board of the present invention.

[0018] Figure 4 is a schematic diagram of the nut locking mechanism of the present invention.

[0019] Figure 5 It is a partial schematic diagram of the upper layer board of the present invention.

[0020] Figure 6 It is a partial side schematic diagram of the upper layer board of the present invention.

[0021] Figure 7 It is a schematic diagram of the lower layer board of the present invention.

[0022] Figure 8 It is a schematic diagram of the spacing self - adapting connection mechanism of the present invention. Specific embodiments

[0023] In order to elaborate in detail on the technical solutions adopted by the present invention to achieve the predetermined technical objectives, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. And, without creative efforts, the technical means or technical features in the embodiments of the present invention can be replaced. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0024] As Figure 1 shown, for a wind turbine nacelle transformer of the present invention, bolt structures 1 are used to connect between the brackets of the wind turbine nacelle transformer, and bolt structures 1 are used to connect between the busbars of the wind turbine nacelle transformer. An anti - loosening device is arranged outside the bolt structure 1. As Figure 2 shown, the anti - loosening device includes an upper layer board 2 and a lower layer board 3. Width adjustment mechanisms are respectively arranged on the upper layer board 2 and the lower layer board 3. The upper layer board 2 and the lower layer board 3 are connected by a spacing self - adapting connection mechanism 4.

[0025] As Figure 3 shown, since the bolt structures 1 of the brackets and busbars of the wind turbine nacelle transformer usually use 6 bolts for fixed connection, in the present invention, 6 nut locking mechanisms 5 are arranged on the lower side surface of the upper layer board 2. The 6 nut locking mechanisms 5 are divided into two groups and symmetrically arranged on the upper and lower sides of the lower side surface of the upper layer board 2. As Figure 4As shown in the figure, each nut locking mechanism 5 includes a locking block 6, an elastic conical ring 7, an external gear ring 8, and a rack 9. The locking block 6 is generally cylindrical. Blind holes 10 matching the locking block 6 are provided on the lower side surface of the upper layer plate 2 corresponding to each locking block 6. The locking block 6 is rotatably arranged in the blind hole 10 and can rotate along the circumferential direction of the blind hole 10. An internal hexagonal hole 11 matching the nut is provided on the lower end surface of the locking block 6. A flared opening 12 is provided at the lower end of the internal hexagonal hole 11. A through hole matching the bolt is provided at the upper end of the internal hexagonal hole 11. The upper end of the locking block 6 is frustum-shaped. The elastic conical ring 7 is fixed on the inner wall of the blind hole 10 at the upper end of the locking block 6. The external gear ring 8 is sleeved on the outside of the locking block 6 and fixedly connected to the locking block 6. The external gear ring 8 meshes with the rack 9. At the beginning, the rack 9 and the external gear ring 8 are in a separated state. At this time, according to the actual installation angles of the bolts in the bolt structure 1, the locking block 6 can be rotated to a suitable angle so that the internal hexagonal hole 11 at the lower end of the locking block 6 is roughly matched with the angles of each nut. Then, the upper layer plate 2 is covered on the bolt structure 1. During the covering process, even if there is a deviation between the actual angle of the internal hexagonal hole 11 and the nut, due to the existence of the flared opening 12, the angle of the internal hexagonal hole 11 can be automatically adjusted during the covering process. When the upper layer plate 2 is completely adjusted in place, the rack 9 is pushed to mesh with the external gear ring 8 to limit the locking block 6 so that it can no longer rotate, completing the locking and fixing of the nut.

[0026] A stepped structure is provided at the lower end of the locking block 6, and a stepped structure matching the lower end of the locking block 6 is also provided at the lower end of the blind hole 10. The stepped structure at the lower end of the locking block 6 meshes with the stepped structure at the lower end of the blind hole 10. The locking block 6 is limited in the blind hole 10 through the stepped structure.

[0027] The elastic conical ring 7 is a ring structure. The inner side of the elastic conical ring 7 arches upward in a conical shape, and the taper of the elastic conical ring 7 matches the taper of the frustum-shaped side surface at the upper end of the locking block 6. Multiple channels 13 are provided in the inner ring of the elastic conical ring 7. The channels 13 are arranged along the radial direction of the elastic conical ring 7, and multiple channels 13 are equally spaced along the circumferential direction of the elastic conical ring 7. The elastic conical ring 7 is divided into multiple pieces along the circumferential direction through the channels 13. When the locking block 6 slides upward to squeeze the elastic conical ring 7, the elastic conical ring 7 is squeezed and deformed upward, and at the same time, a downward rebounding force is provided to the locking block 6.

[0028] As Figure 5 shown, two racks 9 are provided. Each rack 9 meshes with the external gear ring 8 of a group of nut locking mechanisms 5 respectively. The racks 9 are slidably arranged in the upper layer plate 2 along the up and down direction of the upper layer plate 2. Sliding pieces 14 are provided at both ends of the racks 9. The size of the sliding pieces 14 is larger than the vertical cross-sectional size of the racks 9. Thus, the two sliding pieces 14 form a clamping structure and are arranged on both sides of the upper layer plate 2. As Figure 6As shown in the figure, on both sides of the upper layer plate 2, rack sliding grooves 15 matching the rack 9 are provided. On one side of the rack sliding groove 15 away from the center of the upper layer plate 2, a rack cavity 16 is provided and the thickness of the rack cavity 16 is greater than that of the rack sliding groove 15. When not in use, the rack 9 is located in the rack cavity 16. Since the thickness of the rack cavity 16 is greater than that of the rack sliding groove 15, generally, it is difficult for the rack 9 to slide into the rack sliding groove 15 by itself. When it is necessary for the rack 9 to engage with the external gear ring 8, the rack 9 is lifted from the rack cavity 16 and the front side of the rack 9 is aligned with the rack sliding groove 15, and then the rack 9 is pushed along the rack sliding groove 15 towards the center direction of the upper layer plate 2 until the rack 9 engages with the external gear ring 8.

[0029] As Figure 5 shown, on the inner side of the upper layer plate 2, a rack locking mechanism is respectively provided at both ends of the rack 9. The rack locking mechanism includes a locking spring plate 17 and a wedge-shaped buckle 18. A rectangular hole 19 is provided in the upper layer plate 2. The locking spring plate 17 is arranged in the rectangular hole 19 and one end of the locking spring plate 17 is fixed at one end of the rectangular hole 19. The wedge-shaped buckle 18 is fixed at the other end of the locking spring plate 17. When the rack 9 slides along the rack sliding groove 15 to engage with the external gear ring 8, the wedge-shaped buckle 18 locks and positions the rack 9. When the rack 9 is located in the rack cavity 16, the wedge-shaped inclined surface of the wedge-shaped buckle 18 faces the rack 9. When the rack 9 slides inwards along the rack sliding groove 15 and when the rack 9 slides to the position of the wedge-shaped buckle 18, the rack 9 presses down the wedge-shaped buckle 18, and the wedge-shaped buckle 9 drives the elastic plate 17 to bend downwards. When the rack 9 engages with the external gear ring 8, at this time, the rear side of the rack 9 just leaves the wedge-shaped buckle 18, and the wedge-shaped buckle 18 rebounds under the action of the elastic plate 17 to limit and fix the rack 9, so that the rack 9 always remains engaged with the external gear ring 8. Since the rack 9 cannot slide left and right, the external gear ring 8 cannot rotate any more, and the locking and positioning of the nut locking mechanism 5 are completed.

[0030] Among the 6 nut locking mechanisms 5, 4 nut locking mechanisms 5 located on the left and right sides of the upper layer plate 2 are provided with a spacing adjustment mechanism. The spacing adjustment mechanism includes an adjustment sliding plate 20 and an adjustment sliding groove 21. The adjustment sliding groove 21 is arranged on the lower side surface of the upper layer plate 2 along the left and right directions. The adjustment sliding plate 20 is slidably arranged in the adjustment sliding groove 21 and can slide left and right in the adjustment sliding groove 21. The 4 nut locking mechanisms 5 are respectively arranged in the adjustment sliding plates 20 of the four spacing adjustment mechanisms. When it is necessary to adjust the spacing of a group of nut locking mechanisms 5, sliding the adjustment sliding plate 20 along the adjustment sliding groove 21 can complete the spacing adjustment of the nut locking mechanism 5.

[0031] As Figure 7As shown in the figure, 6 circular recesses 22 are formed on the upper side surface of the lower layer plate 3. Among the 6 circular recesses 22, 4 circular recesses 22 located on the left and right sides of the lower layer plate 3 are provided with a spacing adjustment mechanism. Here, the spacing adjustment mechanism is the same as that of the upper layer plate 2, so it will not be elaborated further.

[0032] The width adjustment mechanism includes a number of width adjustment rods 23 and a number of adjustment rod chutes. The upper layer plate 2 and the lower layer plate 3 are respectively composed of a first layer plate and a second layer plate. The first layer plate and the second layer plate are located in the same plane. A number of adjustment rod chutes are formed on the side of the first layer plate facing the second side plate, and the adjustment rod chutes are arranged along the up and down direction of the upper layer plate 2 or the lower layer plate 3. A number of width adjustment rods 23 are arranged along the up and down direction of the upper layer plate 2 or the lower layer plate 3, and one end of each of the number of width adjustment rods 23 is fixed on the side of the second layer plate facing the first layer plate. The other ends of the number of width adjustment rods 23 are slidably arranged in the number of adjustment rod chutes one by one. When it is necessary to adjust the up and down width of the upper layer plate 2 or the lower layer plate 3, only need to pull or contract the first layer plate and the second layer plate along the length direction of the width adjustment rod 23 to complete the adjustment. The self-damping effect is achieved through the clearance fit between the width adjustment rod 23 and the adjustment rod chute.

[0033] There are four groups of spacing self-adaptive connection mechanisms 4, and the four groups of spacing self-adaptive connection mechanisms 4 are respectively located at the four corner positions of the upper layer plate 2 and the lower layer plate 3. As Figure 8 shown, each group of spacing self-adaptive connection mechanisms 4 includes a connection pin 24 and a connection pin hole 25. Four connection pin holes 25 are formed at the four corner positions of the upper layer plate 2. The connection pin 24 includes a cylindrical main body and several groups of tapered barbs 26. A through groove 27 that equally divides the cylindrical main body into two parts is formed downward at the upper end of the cylindrical main body. Several groups of tapered barbs 26 are evenly distributed on the outside of the cylindrical main body from top to bottom. Each group of tapered barbs 26 includes two tapered barbs, and the two tapered barbs are symmetrically distributed on the side surface of the cylindrical main body on both sides of the through groove. The connection pin hole 25 is a through hole with an inner diameter matching the maximum outer diameter of the connection pin 24. A snap ring structure 28 is arranged in the connection pin hole 25. The inner diameter of the snap ring structure 28 matches the outer diameter of the cylindrical main body. A tapered guide hole structure is arranged at the lower end of the snap ring structure 28. When in use, the upper layer plate 2 and the lower layer plate 3 are respectively installed on the upper and lower sides of the bolt structure 1, and then the top end of the connection pin 24 is aligned with the connection pin hole 25 and inserted. When the top end of the connection pin 24 is inserted into the connection pin hole 25 and is compressed inward by the tapered guide hole structure, after passing through the snap ring structure 28, the two tapered barbs at the upper end of the connection pin 24 have no extrusion and thus open to both sides. Repeat this process until the upper layer plate 2 and the lower layer plate 3 are completely installed in place. At this time, the lower end of one group of tapered barbs among several groups of tapered barbs 26 just abuts against the upper end face of the snap ring structure 28, completing the installation and fixation of the upper layer plate 2 and the lower layer plate 3.

[0034] The present invention provides a wind turbine nacelle transformer. The nut of the bolt structure is completely limited and fixed by the upper plate and the lower plate, so that the bolt cannot rotate, thereby eradicating the problem that the bolt may fall off due to vibration. The nut locking mechanism of the present invention uses a locking block designed with a rotating structure to lock the nut. In this way, it can be adjusted according to the actual angular position of the nut. After the adjustment is in place, the nut locking mechanism is completely locked and limited by the sliding rack, which is convenient to operate and has good adaptability. The upper and lower widths of the upper plate and the lower plate of the present invention can be adjusted, and at the same time, the spacing between the nut locking mechanism and the circular concave hole can be adjusted. In this way, it can be adjusted for the bolt fixing structures at different positions, and a set of devices can be used for the nut limitation of different parts of the transformer, with good applicability and the cost of mold opening is solved. The spacing self-adaptive connection mechanism of the present invention can be self-adaptively adjusted for the connection parts of brackets or busbars with different thicknesses, has strong adaptability, and only needs to be directly inserted during fixation, and the operation is convenient without relying on tools.

[0035] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention and is based on the technical essence of the present invention, any simple modification, equivalent replacement and improvement of the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A wind turbine nacelle transformer, wherein the brackets of the wind turbine nacelle transformer are connected by a bolt structure, and the busbars of the wind turbine nacelle transformer are connected by a bolt structure, and it is characterized in that: A loosening prevention device is provided on the outer side of the bolt structure. The loosening prevention device includes an upper layer plate and a lower layer plate. Width adjustment mechanisms are respectively provided on the upper layer plate and the lower layer plate. The upper layer plate and the lower layer plate are connected by a spacing self-adaptive connection mechanism.

2. The wind turbine nacelle transformer according to claim 1, wherein: Six nut locking mechanisms are provided on the lower side surface of the upper layer plate. The six nut locking mechanisms are divided into two groups and symmetrically arranged on the upper and lower sides of the lower side surface of the upper layer plate. Each nut locking mechanism includes a locking block, an elastic conical ring, an external gear ring and a rack. The locking block is integrally cylindrical. Blind holes matching the locking blocks are opened on the lower side surface of the upper layer plate corresponding to each locking block. The locking block is rotatably arranged in the blind hole and can rotate along the circumferential direction of the blind hole. An internal hexagonal hole matching the nut is opened on the lower end surface of the locking block. A flared opening is provided at the lower end of the internal hexagonal hole. A through hole matching the bolt is opened at the upper end of the internal hexagonal hole. The upper end of the locking block is frustum-shaped. The elastic conical ring is fixed on the inner wall of the blind hole at the upper end of the locking block. The external gear ring is sleeved on the outside of the locking block and fixedly connected to the locking block. The external gear ring meshes with the rack.

3. The wind turbine nacelle transformer according to claim 2, characterized in that: A stepped structure is provided at the lower end of the locking block, and a stepped structure matching the lower end of the locking block is also provided at the lower end of the blind hole. The stepped structure at the lower end of the locking block meshes with the stepped structure at the lower end of the blind hole.

4. The wind turbine nacelle transformer according to claim 2, characterized in that: The elastic conical ring is a ring structure. The inner side of the elastic conical ring arches upward in a conical shape and the taper of the elastic conical ring matches the taper of the side surface of the frustum-shaped upper end of the locking block. Multiple channels are opened in the inner ring of the elastic conical ring. The channels are arranged along the radial direction of the elastic conical ring and the multiple channels are equally spaced along the circumferential direction of the elastic conical ring.

5. The wind turbine nacelle transformer according to claim 2, characterized in that: Two racks are provided. Each rack meshes with the external gear ring of a group of nut locking mechanisms respectively. The racks are slidably arranged in the upper layer plate along the up and down direction of the upper layer plate. Sliding pieces are provided at both ends of the racks. Rack sliding grooves matching the racks are opened on both sides of the upper layer plate. A rack accommodating cavity is provided on the side of the rack sliding groove far from the center of the upper layer plate and the thickness of the rack accommodating cavity is greater than that of the rack sliding groove.

6. The wind turbine nacelle transformer according to claim 5, wherein: One rack locking mechanism is respectively provided on the inner side of the upper layer plate corresponding to both ends of the rack. The rack locking mechanism includes a locking elastic plate and a wedge-shaped buckle. A rectangular hole is opened in the upper layer plate. The locking elastic plate is arranged in the rectangular hole and one end of the locking elastic plate is fixed at one end of the rectangular hole. The wedge-shaped buckle is fixed at the other end of the locking elastic plate. When the rack slides along the rack sliding groove to mesh with the external gear ring, the wedge-shaped buckle locks and limits the rack.

7. The wind turbine nacelle transformer according to claim 2, wherein: Among the six nut locking mechanisms, four nut locking mechanisms located on the left and right sides of the upper layer plate are provided with a spacing adjustment mechanism. The spacing adjustment mechanism includes an adjustment sliding plate and an adjustment sliding groove. The adjustment sliding groove is opened on the lower side surface of the upper layer plate along the left and right direction. The adjustment sliding plate is slidably arranged in the adjustment sliding groove and can slide left and right in the adjustment sliding groove.

8. The wind turbine nacelle transformer according to claim 1, wherein: Six circular concave holes are opened on the upper side surface of the lower layer plate. Four circular concave holes located on the left and right sides of the lower layer plate among the six circular concave holes are provided with a spacing adjustment mechanism.

9. A wind turbine nacelle transformer according to claim 1, characterized in that: The width adjustment mechanism includes a number of width adjustment rods and a number of adjustment rod chutes. The upper plate and the lower plate are respectively composed of a first layer plate and a second layer plate. The first layer plate and the second layer plate are in the same plane. On the side of the first layer plate facing the second side plate, a number of adjustment rod chutes are opened and the adjustment rod chutes are arranged along the up and down direction of the upper plate or the lower plate. A number of width adjustment rods are arranged along the up and down direction of the upper plate or the lower plate, and one end of a number of width adjustment rods is fixed on the side of the second layer plate facing the first layer plate. The other ends of a number of width adjustment rods are slidably arranged in a number of adjustment rod chutes in a one-to-one correspondence.

10. A wind turbine nacelle transformer according to claim 1, characterized in that: Four groups of distance self-adaptive connection mechanisms are provided. The four groups of distance self-adaptive connection mechanisms are respectively located at the four corner positions of the upper plate and the lower plate. Each group of distance self-adaptive connection mechanisms includes a connection pin and a connection pin hole. Four connection pin holes are opened at the four corner positions of the upper plate. The connection pin includes a cylindrical main body and a number of groups of tapered barbs. A through groove that equally divides the cylindrical main body into two parts is opened downward at the upper end of the cylindrical main body. A number of groups of tapered barbs are evenly distributed on the outer side of the cylindrical main body from top to bottom. Each group of tapered barbs includes two tapered barbs, and the two tapered barbs are symmetrically distributed on the side surface of the cylindrical main body on both sides of the through groove. The connection pin hole is a through hole with an inner diameter matching the maximum outer diameter of the connection pin. A snap ring structure is arranged in the connection pin hole. The inner diameter of the snap ring structure matches the outer diameter of the cylindrical main body. A tapered guide hole structure is arranged at the lower end of the snap ring structure.

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