Mainframe transportation structure and transportation method of a wind turbine

Abstract

A main unit transportation structure and transportation method for a wind turbine, wherein the main unit transportation structure disassembles the main unit into a shaft seat, a main shaft, a main unit seat, a generator, and a gear assembly. The shaft seat, the shaft seat, the main unit seat, the generator, and the gear assembly are assembled into one body to form the transportation main body of the main unit. The present invention also includes a transportation method for the main unit of a wind turbine. By disassembling and transporting the main unit, without adding components such as a nacelle cover and a control cabinet, the weight of the transportation main body can be greatly reduced, and it can be transported on land by a transport vehicle. This not only greatly improves the transportation efficiency and is applicable to transportation in various geographical locations, but also the present invention is particularly suitable for the transportation of large-megawatt main units, which neither crushes the road nor requires building a factory at the location where wind power is installed, thus greatly reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, in particular to a main machine transportation structure and a transportation method for a wind turbine. Background Art

[0002] Existing main machines of wind turbines mainly include nacelle bases, nacelle covers, main bearing seats arranged in the nacelles, generators, main shafts, yaw systems, gearboxes, control cabinets, etc. After the main machine is assembled as a whole, it weighs hundreds of tons, and vehicles simply cannot transport it. Existing transportation methods mainly include the following several types: (1) Transport the main machine by a semi-trailer, and at least two or three tractors, such as forklifts, need to be arranged in front of the semi-trailer. Steel wires are used as traction between each vehicle, and they are transported one by one like this. Moreover, once one vehicle stops, all previous efforts will be wasted; this method not only consumes vehicles, causes large vehicle losses, and greatly reduces the service life, and it is easy to be scrapped in about two years; moreover, due to the large weight of the main machine, it is easy to crush the road during transportation, resulting in a significant increase in road repair costs. (2) The second method is not to transport, but to directly build a factory to produce the main machine at the place where wind power is needed (such as by the sea). Because existing transport vehicles generally can transport a main machine of about 6MW at most, and for larger main machines, the transportation limit will be exceeded. Therefore, for larger megawatt main machines, basically the method of building a factory and then hoisting is adopted, so there is no need for transportation; however, this method requires spending costs to find a place to build a factory, and it is not applicable for installing the main machine at a site where a factory cannot be built; (3) The third method is mainly for offshore wind power, and the main machine is mainly transported by ship, but it is only applicable to offshore wind power, so the applicable range is limited.

[0003] Based on the above existing technologies, the present invention urgently needs to design a main machine transportation structure that can meet the requirements of land transportation and solve the above technical problems at the same time. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above deficiencies of the prior art and provide a main machine transportation structure and a transportation method for a wind turbine that are compact in structure, light in weight, and convenient for land transportation.

[0005] The technical solution of the present invention is as follows:

[0006] For a main machine transportation structure of a wind turbine of the present invention, the main machine is disassembled into a shaft seat, a main shaft, a main machine seat, a generator, and a gear assembly. The shaft seat, the shaft seat, the main machine seat, the generator, and the gear assembly are assembled into one body to form the transportation main body of the main machine.

[0007] Further, the shaft seat includes a first shaft seat and a second shaft seat that are detachably connected. An arc-shaped cavity and a first accommodation cavity for inserting a gear assembly are provided on the main body of each shaft seat. After the first shaft seat and the second shaft seat are connected, the main shaft is placed in the cavity formed by docking the two arc-shaped cavities. The main base is provided at the bottom of the shaft seat. The generator is installed on the main base. The gear assembly includes multiple sets of gears of different sizes, which are respectively arranged on the main shaft, in the first accommodation cavity of the shaft seat, and at the position between the shaft seat and the generator.

[0008] Further, the gear assembly includes a first gear group, and the first gear group is a gear sleeved outside the main shaft. Both the main shaft and the first gear group are arranged in the cavity of the shaft seat.

[0009] Further, the gear assembly further includes a second gear group and a third gear group. The second gear group includes multiple cylindrical gears, and the third gear group includes multiple circular gears equivalent in number to the second gear group. The cylindrical gears are inserted into the central holes of the circular gears, and the cylindrical gears extend into the first accommodation cavity of the shaft seat and mesh with the gears of the first gear group.

[0010] Further, the gear assembly further includes a fourth gear group and a fifth gear group. The fourth gear group includes multiple small cylindrical gears with an outer diameter smaller than that of the second gear group. The fifth gear group includes multiple small circular gears with an outer diameter smaller than that of the third gear group. One end of the small cylindrical gears is inserted into the central holes of the small circular gears, and the small cylindrical gears mesh with the circular gears of the third gear group.

[0011] Further, a first tooth seat and a second tooth seat fixed to the main base are provided at the rear side of the shaft seat, and a cavity is formed by enclosing the first tooth seat and the second tooth seat. The multiple circular gears of the third gear group are arranged vertically, and the circular gear at the lower part is placed in the cavity formed by enclosing the first tooth seat and the second tooth seat. Multiple second accommodation cavities for placing small cylindrical gears are oppositely provided on the first tooth seat and the second tooth seat.

[0012] Further, multiple generators are provided, and the gears on each generator respectively mesh with the small circular gears of the fifth gear group.

[0013] Further, the main base is divided into a front main base and a rear main base that are detachably connected. The shaft seat and the gear assembly are arranged on the front main base, and the generator is arranged on the rear main base.

[0014] Further, a motor seat is provided in the middle of the rear side of the main base, and at least one generator is installed on the top of the motor seat. At least one generator is also installed on the main base on at least one side of the motor seat.

[0015] A method for transporting the main body of a wind turbine according to the present invention includes the following steps: disassembling the main body into a shaft seat, a main shaft, a main frame, a generator, and a gear assembly, installing the shaft seat and the generator on the main frame, placing the main shaft in the shaft seat, and arranging the gear assembly between the shaft seat and the generator; and the front gear of the gear assembly extends into the shaft seat, the rear gear meshes with the gear of the generator, and the gears of the gear assembly mesh with each other; after all components are fixed, a transportation main body of the main body is formed for transportation; after being transported to the construction site, the transportation main body is disassembled and reassembled again to form the main body structure.

[0016] The beneficial effects of the present invention are as follows: on the one hand, by disassembling and transporting the main body, there is no need to add components such as the nacelle cover and the control cabinet, which can greatly reduce the weight of the transportation main body, and it can be transported by a transport vehicle on land, not only greatly improving the transportation efficiency and being applicable to transportation in various geographical locations; moreover, the present invention is particularly suitable for transporting large-megawatt main bodies, neither crushing the road nor requiring the construction of a factory at the location where wind power is installed, greatly reducing costs; on the other hand, by arranging the positions of the gears of the gear assembly, the gears of different sizes can mesh with each other, and the gear assembly can also mesh with the main shaft and the generator. Moreover, the gears of the gear assembly are compactly arranged, which can greatly reduce the overall width. And the length of the transportation main body of the main body of the present invention is the length of the main frame, and the width is also the width of the main frame, so that the shaft seat, the main shaft, the generator, and the gear assembly are all closely arranged on the main frame, which can meet the land transportation standard and greatly improve the transportation convenience. Brief Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the transportation main body in the embodiment of the present invention;

[0018] Figure 2 is the disassembled structural schematic diagram of the shaft seat in the embodiment of the present invention;

[0019] Figure 3 is the structural schematic diagram of the transportation main body removing the shaft seat in the embodiment of the present invention;

[0020] Figure 4 is Figure 1 the schematic diagram of the back structure of the shown embodiment;

[0021] Figure 5 is the layout schematic diagram of the second gear set and the third gear set in the embodiment of the present invention;

[0022] Figure 6 is the meshing structural schematic diagram of the gear assembly in the embodiment of the present invention;

[0023] Figure 7 is the structural schematic diagram of the first tooth seat and the second tooth seat in the embodiment of the present invention;

[0024] Figure 8 This is a schematic structural diagram of the main engine base in an embodiment of the present invention.

[0025] Explanation of the attached drawing reference numerals:

[0026] 1. Axle seat; 2. Main shaft; 3. Main engine base; 4. Generator; 5. Gear assembly; 6. First tooth seat; 7. Second tooth seat; 11. First axle seat; 12. Second axle seat; 31. Front main engine base; 32. Rear main engine base; 41. Motor base; 51. Large gear; 52. Cylindrical gear; 53. Circular gear; 54. Small cylindrical gear; 55. Small circular gear; 61. Second accommodation cavity; 111. Arc-shaped concave cavity; 112. First accommodation cavity; 113. Annular wall; 114. Square hole; 311. Placing hole; 1121. Round hole. Detailed implementation manners

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

[0028] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0029] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] As Figure 1 and Figure 4 shown: A main engine transportation structure of a wind turbine, disassembling the main engine into an axle seat 1, a main shaft 2, a main engine base 3, a generator 4 and a gear assembly 5, and assembling the axle seat 1, the main shaft 2, the main engine base 3, the generator 4 and the gear assembly 5 into one body to form the main transportation body of the main engine.

[0031] The above solution has the following advantages: By disassembling the main engine for transportation and not including components such as the nacelle cover and control cabinet, the weight of the transportation main body can be greatly reduced, and it can be transported on land by a transport vehicle. On the one hand, the transportation efficiency is greatly improved, making it suitable for transportation in various geographical locations; on the other hand, the present invention is particularly suitable for the transportation of large-megawatt main engines, such as the transportation of main engines exceeding 6 MW. It will not only not crush the road surface, but also does not require building a factory at the location where the wind power is installed, greatly reducing costs.

[0032] As Figure 2 shown: In this embodiment, the shaft seat 1 includes a first shaft seat 11 and a second shaft seat 12 that are detachably connected. An arc-shaped concave cavity 111 and a first receiving cavity 112 for inserting a gear assembly are provided on the main body of each shaft seat; after the first shaft seat and the second shaft seat are connected, the main shaft 2 is placed in the cavity formed by the docking of the two arc-shaped concave cavities 111; the main engine seat 3 is provided at the bottom of the shaft seat 1; the generator 4 is installed on the main engine seat 3; the gear assembly 5 includes multiple groups of gears of different sizes, which are respectively arranged on the main shaft 2, in the first receiving cavity 112 of the shaft seat 1, and at the position between the shaft seat 1 and the generator 4; the above-mentioned components are integrated into one body to form the transportation main body of the main engine. This position setting and connection can greatly improve the compactness of the entire transportation main body and make it meet the transportation standards.

[0033] As Figure 1 and Figure 3As shown: In this embodiment, the first shaft seat 11 and the second shaft seat 12 can be placed vertically or horizontally. In this embodiment, it is preferably placed vertically. By dividing the shaft seat into two parts, it is convenient to install other components. The two shaft seats have the same structure and are both provided with arc-shaped cavities. After the first shaft seat 11 and the second shaft seat 12 are butted vertically, the two arc-shaped cavities 111 are spliced into an annular cavity, preferably a circular cavity, for placing the main shaft 2. The first shaft seat 11 and the second shaft seat 12 of this embodiment serve as the bearing seats of the main shaft 2. In addition, two circular holes 1121 are symmetrically provided on both the first shaft seat 11 and the second shaft seat 12 to form the first accommodating cavity 112. The two first accommodating cavities 112 are located on both sides above the arc-shaped cavity 111, and are symmetrically arranged between the circular holes 1121 of the upper and lower shaft seats. Specifically, the main bodies of the first shaft seat 11 and the second shaft seat 12 include a front plate, a rear plate, a top plate (the bottom plate for the shaft seat located at the lower part), and side plates. The bottom (the top for the shaft seat located at the lower part) is an open structure and forms an arc-shaped cavity 111. Circular holes 1121 are correspondingly provided on both the front plate and the rear plate. The first accommodating cavity 112 is formed between the circular holes of the front plate and the rear plate. And the circular holes around the rear plate protrude outward to form an annular wall 113 for protecting the gears. The side plates are provided with a hollow structure, such as a plurality of holes, to reduce the weight. Two square holes 114 are provided on the top plate of the shaft seat 1. The square holes 114 communicate with the arc-shaped cavity 111 to facilitate observing the position of the gears, ensure that the gears in the arc-shaped cavity are engaged with the gears at the circular holes, and at the same time reduce the weight of the shaft seat. The upper and lower shaft seats are fixed by screwing.

[0034] In this embodiment, the gear assembly 5 includes a first gear set. The first gear set is a large gear 51 sleeved outside the main shaft 2. Both the main shaft 2 and the large gear 51 are arranged in the cavity of the shaft seat 1. Among them, the large gear 51 is the largest-sized gear, sleeved on the main shaft 2, and is arranged in the annular cavity formed by the first shaft seat 11 and the second shaft seat 12 together with the main shaft 2, so that the large gear is protected by the shaft seat during transportation and will not be damaged by knocking.

[0035] Such as Figure 5 and Figure 6As shown: In this embodiment, the gear assembly 5 further includes a second gear set and a third gear set. The second gear set includes a plurality of cylindrical gears 52, such as the gears commonly used in the yaw system. The third gear set includes a plurality of circular gears 53 equal in number to the second gear set. The cylindrical gears 52 are inserted into the central holes of the circular gears 53, and the cylindrical gears 52 extend into the first accommodation cavity 112 of the shaft seat and mesh with the large gear 51 of the first gear set. Specifically, the outer diameter of the circular gear 53 is smaller than the size of the large gear of the first gear set. In this embodiment, a total of four circular gears 53 are provided. The four circular gears 53 are placed pairwise, one above the other, parallel to the shaft seat. The cylindrical gears 52 on the two upper circular gears 53 extend into the two first accommodation cavities 112 of the first shaft seat 11, and the cylindrical gears 52 on the two lower circular gears 53 extend into the two first accommodation cavities 112 of the second shaft seat 12. The shaft seat 1 protects the cylindrical gears 52, and each cylindrical gear 52 meshes with the large gear 51 of the first gear set. Through this setting method, not only can the compactness of the overall structure be ensured, so that there will be no more gaps between the circular gear and the shaft seat, maintaining the overall compactness, but also one end of the cylindrical gear extends into the central hole of the circular gear, and the other end extends into the shaft seat. While ensuring the structural compactness, it can also protect the cylindrical gear from wear, and the cylindrical gear meshes with the large gear, which can ensure the stability of the overall structure and prevent shaking during transportation.

[0036] In this embodiment, the gear assembly 5 further includes a fourth gear set and a fifth gear set; the fourth gear set includes a plurality of small cylindrical gears 54 with an outer diameter smaller than that of the second gear set; the fifth gear set includes a plurality of small circular gears 55 with an outer diameter smaller than that of the third gear set; one end of the small cylindrical gear 54 is inserted into the central hole of the small circular gear 55, and the small cylindrical gear 54 meshes with the circular gear 53 of the third gear set. Specifically, the number of both the small cylindrical gears 54 and the small circular gears 55 is four. The arrangement positions of the four small circular gears 55 are such that the four small cylindrical gears 54 can just mesh with the four circular gears 53 of the third gear set, that is, one small cylindrical gear meshes with one circular gear respectively.

[0037] Such as Figure 7As shown: In this embodiment, on the rear side of the shaft seat 1, there are a first tooth seat 6 and a second tooth seat 7 fixed to the main machine seat 3, and the first tooth seat 6 and the second tooth seat 7 enclose a cavity; two circular gears 53 in the lower part of the third tooth group are placed in the cavity enclosed by the first tooth seat 6 and the second tooth seat 7; a plurality of second accommodation cavities 61 for placing small cylindrical gears are oppositely provided on the first tooth seat 6 and the second tooth seat 7. Specifically, the first tooth seat 6 is of a door frame structure, including three vertically arranged columns and crossbeams connecting the columns, and there are relatively large gaps between adjacent columns, facilitating the cylindrical gears 52 on the two circular gears 53 in the lower part of the third tooth group to extend into the first accommodation cavity 112 of the second shaft seat 12; the two circular gears 53 in the upper part of the third tooth group are located above the first tooth seat 6 and the second tooth seat 7, and a part of the bottom of the circular gear 53 is located in the cavity enclosed by the first tooth seat 6 and the second tooth seat 7. The surface of the first tooth seat 6 facing the shaft seat 1 is a plane, and on the surface facing the second tooth seat 7, there are protrusions extending along the crossbeam and the columns, so as to facilitate enclosing a cavity structure with the second tooth seat 7. And the crossbeam has a certain width, and there are circular holes corresponding to the number of small cylindrical gears 54 on the crossbeam, and corresponding circular holes are also provided on the second tooth seat 7, and the second accommodation cavity 61 is formed between the circular holes of the two, enabling the small cylindrical gears 54 of the fourth tooth group to extend into the circular holes of the first tooth seat 6 along the circular holes of the second tooth seat 7 for protection. The second tooth seat 7 mounts the small circular gear 55 of the fifth tooth group on the surface facing the generator 4.

[0038] As Figure 8 shown: In this embodiment, the main machine seat 3 serves as the base of the main machine and is divided into a front main machine seat 31 and a rear main machine seat 32, and the two are detachably connected, such as by screw connection, so that the components on the front main machine seat 31 and the rear main machine seat 32 can be installed separately. Among them, the shaft seat 1, the main shaft 2, and the gear assembly 5 are all arranged on the front main machine seat 31, and the generator 4 is arranged on the rear main machine seat 32. After the components on the front and rear main machine seats are installed, the front and rear main machine seats are then assembled with each other. If an integral main machine seat is used, the installation speed will be greatly reduced. In addition, there is a placement hole 311 on the front main machine seat 31 for placing the two circular gears 53 in the lower part of the third tooth group.

[0039] There are four generators 4 in this embodiment to achieve a main machine with a large megawatt power. Currently, the largest megawatt main machine for land transportation is usually 6MW, usually about 15 - 18MW by the sea, and usually 8MW on the Gobi Desert. The present invention can achieve more than 20MW, such as 30MW, which has broken through the transportation limit and cannot be transported at all according to the traditional method. By splitting the main machine and then integrating it as the transportation main body for transportation, the present invention can achieve land transportation.

[0040] As Figure 4As shown in the figure: In this embodiment, a motor base 41 is provided in the middle of the rear main frame 32. Two generators 4 are fixedly installed on the motor base 41. One generator 4 is installed on each side of the motor base 41 on the main frame 3. The gears on the four generators 4 are respectively meshed with the respective small circular gears 55 of the fifth gear set. The arrangement positions of the four small circular gears 55 in this embodiment are horizontally placed, and the positions of the two middle small circular gears 55 are higher than the positions of the small circular gears 55 on both sides, so that the four small circular gears 55 can not only be meshed with the gears on the four generators 4, but also the small cylindrical gears 54 on them can be meshed with the circular gear 53 of the third gear set.

[0041] It can be said that in this embodiment, by arranging the positions of the various gears of the gear assembly, the various gears of different sizes can be meshed with each other, and the meshing between the gear assembly, the main shaft and the generator can be realized. Moreover, the various gears of the gear assembly are compactly arranged, which can greatly reduce the overall width. And the length of the main body for transporting the host of the present invention is the length of the main frame, and the width is also the width of the main frame, so that the shaft seat, the main shaft, the generator and the gear assembly are all closely arranged on the main frame, which can meet the container transportation standard and greatly improve the transportation convenience.

[0042] In this embodiment, the various gears of different sizes of the gear assembly 5 are mainly the gears used in the gearbox, the main shaft and the yaw system.

[0043] The method for transporting the main body of the wind turbine generator in this embodiment includes the following steps:

[0044] S101: Divide the main body into a shaft seat 1, a main shaft 2, a main frame 3, a generator 4 and a gear assembly 5. The rest of the nacelle, control cabinet, etc. are not within the transportation main body; assemble the above components according to the aforementioned position and structural relationship, and the front main frame and the rear main frame can be assembled separately.

[0045] S102: Install the shaft seat 1 and the generator 4 on the main frame 3, place the main shaft 2 in the shaft seat 1, and arrange the gear assembly 5 between the shaft seat 1 and the generator 4; and the front-side gears of the gear assembly 5 extend into the shaft seat 1, the rear-side gears are meshed with the gears of the generator 4, and the various gears of the gear assembly 5 are meshed with each other; after all components are fixed, form the transportation main body of the main body for transportation.

[0046] Specifically, the shaft seat 1, the main shaft 2 and the gear assembly 5 are installed on the front main seat 31, and the gear assembly 5 is fixed by the first tooth seat 6 and the second tooth seat 7. For example, first place the two circular gears 53 at the lower part of the third tooth group in the placement hole 311 of the front main seat, then place the first tooth seat 6 and the second tooth seat 7 and fixedly connect them to the front main seat 31, and then place the two circular gears 53 at the upper part of the third tooth group. Place the main shaft 2 with the large gear 51 between the four cylindrical gears 52 carried by the four circular gears 53; then install the fourth tooth group and the fifth tooth group, that is, install the small circular gear 55 with the small cylindrical gear 54 on the first tooth seat 6 and the second tooth seat 7.

[0047] It can be understood that the present invention does not limit the specific assembly method, and it can also be assembled in other ways. For example, first place the two circular gears 53 at the lower part of the third tooth group in the placement hole 311 of the front main seat 31, then place the main shaft 2 with the large gear 51 and mesh it with the two circular gears 53 at the lower part, and then place the two circular gears 53 at the upper part and mesh them with the large gear 51.

[0048] Install the motor seat 41 and the four generators 4 on the rear main seat 32. After fixing, mesh the gears on the four generators 4 on the rear main seat 32 with the four small circular gears 55 at the rear side of the front main seat, and then fix the front main seat 31 and the rear main seat 32 to form a complete main engine transportation body for transportation.

[0049] S103: After being transported to the construction site, disassemble and reassemble the transportation body again to form the main engine structure.

[0050] Specifically, since the traditional main engine is usually more than ten meters wide and high and more than twenty meters long, and the maximum size that can meet the container size transportation on land is usually not more than 4.8 meters, the present invention designs the transportation body for the main engine, which can meet the transportation standard, and this structure can also meet the container transportation standard. After being transported to the construction site, the transportation body can be disassembled. After disassembly, fix the generators, shaft seats, gearboxes, main shafts, yaw systems, etc. inside the main engine to form a real main engine structure.

[0051] In summary, on the one hand, the present invention disassembles and transports the main engine without adding components such as the nacelle cover and control cabinet, which can greatly reduce the weight of the transportation main body. Thus, it can be transported on land by a transport vehicle, not only greatly improving the transportation efficiency and being applicable to transportation in various geographical locations, but also being particularly suitable for transporting large-megawatt main engines, which neither crushes the road nor requires building a factory at the location where wind power is installed, greatly reducing costs. On the other hand, by arranging the positions of the gears of the gear assembly, the gears of various sizes can mesh with each other, and the gear assembly can also mesh with the main shaft and the generator. Moreover, the gears of the gear assembly are tightly arranged, which can greatly reduce the overall width. In addition, the length of the main engine transportation main body of the present invention is the length of the main engine base, and the width is also the width of the main engine base. The shaft seat, main shaft, generator, and gear assembly are all tightly arranged on the main engine base, which can meet the land transportation standard and greatly improve the transportation convenience.

[0052] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A mainframe transportation structure for a wind turbine, characterized in that, The main machine is disassembled into a shaft seat, a main shaft, a main machine base, a generator and a gear assembly. The main shaft, the shaft seat, the main machine base, the generator and the gear assembly are assembled into one body to form the transportation main body of the main machine. The shaft seat includes a first shaft seat and a second shaft seat which are detachably connected. An arc-shaped concave cavity and a first accommodation cavity for inserting the gear assembly are formed on the main body of each shaft seat. After the first shaft seat and the second shaft seat are connected, the main shaft is placed in the cavity formed by docking the two arc-shaped concave cavities. The main machine base is arranged at the bottom of the shaft seat. The generator is installed on the main machine base. The gear assembly includes multiple groups of gears with different sizes, which are respectively arranged on the main shaft, in the first accommodation cavity of the shaft seat and at the position between the shaft seat and the generator.

2. The main machine transportation structure of the wind turbine according to claim 1, characterized in that, The gear assembly includes a first gear group, and the first gear group is a gear sleeved outside the main shaft. Both the main shaft and the first gear group are arranged in the cavity of the shaft seat.

3. The main machine transportation structure of the wind turbine according to claim 2, characterized in that, The gear assembly further includes a second gear group and a third gear group. The second gear group includes multiple cylindrical gears, and the third gear group includes multiple circular gears with the same quantity as the second gear group. The cylindrical gears are inserted into the central holes of the circular gears, and the cylindrical gears extend into the first accommodation cavity of the shaft seat and mesh with the gears of the first gear group.

4. The main machine transportation structure of the wind turbine according to claim 3, characterized in that, The gear assembly further includes a fourth gear group and a fifth gear group. The fourth gear group includes multiple small cylindrical gears with an outer diameter smaller than that of the second gear group. The fifth gear group includes multiple small circular gears with an outer diameter smaller than that of the third gear group. One end of the small cylindrical gear is inserted into the central hole of the small circular gear, and the small cylindrical gear meshes with the circular gears of the third gear group.

5. The main machine transportation structure of the wind turbine according to claim 3, characterized in that, A first tooth seat and a second tooth seat fixed on the main machine base are arranged at the rear side of the shaft seat, and the first tooth seat and the second tooth seat enclose a cavity. The multiple circular gears of the third gear group are arranged vertically, and the circular gear at the lower part is placed in the cavity enclosed by the first tooth seat and the second tooth seat. Multiple second accommodation cavities for placing the small cylindrical gears are oppositely formed on the first tooth seat and the second tooth seat.

6. The main machine transportation structure of the wind turbine according to claim 4, characterized in that There are multiple generators, and the gears on each generator respectively mesh with the small circular gears of the fifth gear group.

7. The main machine transportation structure of the wind turbine according to any one of claims 1 to 6, characterized in that The main machine base is divided into a front main machine base and a rear main machine base which are detachably connected. The shaft seat and the gear assembly are arranged on the front main machine base, and the generator is arranged on the rear main machine base.

8. The main machine transportation structure of the wind turbine according to any one of claims 1 to 6, characterized in that, A motor seat is arranged in the middle of the rear side of the main machine base, and at least one generator is installed on the top of the motor seat. At least one generator is also installed on the main machine base at least on one side of the motor seat.

9. A mainframe transportation method for a wind turbine, characterized in that, Including the following steps: Disassemble the main machine into a shaft seat, a main shaft, a main machine base, a generator and a gear assembly. Install the shaft seat and the generator on the main machine base, place the main shaft in the shaft seat, and arrange the gear assembly between the shaft seat and the generator. And the front-side gears of the gear assembly extend into the shaft seat, the rear-side gears mesh with the gears of the generator, and the gears of each group of the gear assembly mesh with each other. After all components are fixed, form the transportation main body of the main machine for transportation. After being transported to the construction site, disassemble and reassemble the transportation main body again to form the main machine structure.

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