A wind turbine gearbox and generator assembly and disassembly method thereof

Abstract

The present invention discloses a gearbox and generator assembly of a wind turbine, including a gearbox and a generator. The gearbox has an output shaft assembly, which is detachably connected to the housing of the gearbox. The generator has a rotor and a transition flange, which is detachably installed in the rotor, and the transition flange is detachably connected to the output shaft assembly. The rotor is configured to be installed on the housing of the gearbox through a connecting tool, and the inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, so that the output shaft assembly can be taken out of the rotor after the transition flange is removed. The present invention also discloses a disassembly method of the gearbox and generator assembly of the above-mentioned wind turbine. The gearbox and generator assembly of the above-mentioned wind turbine and the disassembly method thereof do not require the rental of a large crane or a lifting ship, and can achieve rapid disassembly and reassembly of the output shaft component with the highest failure rate, greatly reducing the difficulty and cost of maintenance, and reducing the loss of power generation due to shutdown of the unit.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a gear box and generator assembly of a wind turbine set and a disassembly method thereof. Background Art

[0002] With the competition in the wind power market, the price of wind power equipment continues to drop, and wind turbine manufacturers must continue to reduce manufacturing costs while ensuring that performance meets requirements. In the unit structure, the cost and performance of the transmission chain directly determine the cost and performance of the unit.

[0003] The traditional wind turbine transmission chain includes hub, main shaft, main shaft bearing, bearing seat, gearbox, generator, coupling and other components. In order to improve market competitiveness, the development trend of wind turbine transmission chain is to integrate the main shaft, main bearing, main bearing seat, gearbox, generator and other components into an integrated structure, thereby eliminating some couplings and sharing the box structure, so as to reduce the number of parts and shorten the length of the transmission chain to reduce weight, thereby achieving the purpose of reducing costs. This kind of structure is usually called a fully integrated transmission chain wind turbine. There are also semi-integrated structures in which the gearbox in the transmission chain is integrated with the generator, or the gearbox is integrated with the main shaft component, while the other components are not integrated.

[0004] In the fully integrated transmission chain, the input shaft of the speed increasing gearbox is rigidly connected to the rear end of the main shaft with bolts (or bolts + pins) to realize the transmission of the main shaft torque to the gearbox; the front housing of the gearbox is rigidly connected to the main shaft bearing seat with bolts as a whole; the rear housing of the gearbox is rigidly connected to the stator housing of the generator as a whole; the generator rotor is directly connected to the output shaft of the gearbox or connected through a coupling. In the semi-integrated structure, one solution is that the rear housing of the gearbox is rigidly connected to the stator housing of the generator as a whole; the generator rotor is directly connected to the output shaft of the gearbox or connected through a coupling.

[0005] Compared with the traditional wind power transmission chain structure, it can be seen that one of the main features of the integrated or one of the semi-integrated transmission chain structures is that the generator stator housing is fixed to the rear housing of the gearbox, and the generator rotor is suspended on the output shaft of the gearbox. It can be seen that the generator is not an independent component, but the stator and rotor are suspended on the rear end of the gearbox respectively, and combined with the gearbox as a whole to form a gearbox-generator integrated assembly. This integrated assembly has the advantages of compact structure, light weight and low cost.

[0006] However, there are also disadvantages, namely: the operating speed of the sun gear of the output stage of the gearbox and the output shaft, bearings, etc. connected to it is much higher than the other parts of the gearbox, which belongs to high-speed and heavy-load conditions, and therefore belongs to the parts with high fault incidence. However, these parts are surrounded by the generator stator at the center of the rear end of the gearbox, and the axial direction is also blocked by the generator rotor. Once a fault occurs, it is impossible to repair / replace the parts on site in the engine room. To complete the maintenance / replacement, a large crane (on land) or a lifting ship (on sea) must be used to dismantle and lift the entire gearbox generator from the engine room, and then transport it to the manufacturing plant, dismantle the generator from the rear end of the gearbox, and then repair the output stage sun gear or output shaft parts of the gearbox (including the output shaft, output shaft bearing, sealing ring, etc.). After the repair is completed, it will be transported to the site, and a large crane or lifting ship will be needed to complete the reinstallation. The whole process is labor-intensive, the lifting cost is extremely high, and the final maintenance cost is high. In addition, since this method involves disassembly, transportation, maintenance, lifting and re-engine, the entire maintenance cycle takes a long time, and the shutdown leads to huge power generation losses. Summary of the invention

[0007] Based on this, it is necessary to provide a wind turbine gearbox and generator assembly and a disassembly method thereof to address the problem that in the existing gearbox-generator integrated assembly, huge maintenance costs and power generation losses are easily generated when the gearbox part fails.

[0008] A wind turbine gearbox and generator assembly, comprising:

[0009] A gear box, wherein the gear box has an output shaft assembly, and the output shaft assembly is detachably connected to a housing of the gear box;

[0010] A generator, comprising a rotor and a transition flange, wherein the transition flange is detachably mounted in the rotor, and the transition flange is detachably connected to the output shaft assembly;

[0011] The rotor is configured to be mounted on the housing of the gearbox via a connecting tool, and the inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly so that the output shaft assembly can be removed from the rotor after the transition flange is removed.

[0012] In one of the embodiments, the output shaft assembly includes a bearing seat and an output shaft mounted on the bearing seat, the bearing seat is detachably mounted on the housing of the gear box, and the transition flange is detachably connected to the output shaft.

[0013] In one embodiment, the rotor includes a rotor hub, the rotor hub is installed in the rotor, the transition flange is detachably connected to the rotor hub, and the inner cavity of the rotor hub is larger than the maximum outer diameter of the output shaft assembly.

[0014] In one of the embodiments, a positioning hole is provided on the housing of the gearbox, and a maintenance hole is provided on the rotor. The connecting tool is used to penetrate the positioning hole and the maintenance hole to install the rotor on the housing of the gearbox.

[0015] In one embodiment, the connecting tool includes a fixing tool, a threaded fastener and a locking nut. The fixing tool is inserted into the positioning hole and the maintenance hole. The fixing tool is axially provided with a through hole. One end of the threaded fastener is threadedly connected to the positioning hole through the through hole. The other end of the threaded fastener is axially limited by the fixing tool through a limit head. The locking nut is installed on the fixing tool to limit the rotor.

[0016] A method for disassembling a gearbox and a generator assembly of a wind turbine as described in any one of the above items comprises the following steps:

[0017] Remove the accessories on the generator rear cover to reveal the operating space inside the rotor;

[0018] Install the rotor of the generator on the gearbox body through the connecting tool;

[0019] Dismantle the transition flange and move it outside the generator;

[0020] The output shaft assembly is disassembled and moved out of the generator through the cavity in the rotor.

[0021] In one embodiment, before the step of removing the generator rear cover attachment to expose the operating space in the rotor, the step further includes:

[0022] Position the transmission chain of the wind turbine so that the positioning hole is aligned with the maintenance hole and the wind wheel is locked.

[0023] In one embodiment, the step of installing the rotor of the generator on the housing of the gearbox through the connecting tooling specifically includes:

[0024] Insert the fixing tool into the positioning hole and the maintenance hole;

[0025] Insert the threaded fastener into the positioning hole through the through hole of the fixing tool, thread one end of the threaded fastener is connected to the positioning hole, and the other end of the threaded fastener is axially limited with the fixing tool through a limit head;

[0026] Install the locking nut on the end of the fixing fixture, make the locking nut close to the end face of the maintenance hole and apply the required torque.

[0027] In one embodiment, the steps of disassembling the transition flange and removing it outside the generator are specifically:

[0028] Remove the connecting bolts between the transition flange and the rotor;

[0029] Extend the lifting arm of the lifting device into the rotor and connect it to the transition flange;

[0030] Remove the connecting bolts between the filter flange and the output shaft, and use the lifting tool to move the transition flange out of the generator.

[0031] In one embodiment, the step of disassembling the output shaft assembly and moving the output shaft assembly out of the generator through the cavity in the rotor is specifically as follows:

[0032] Disassemble the output shaft assembly and the gearbox housing;

[0033] Extend the lifting arm of the lifting device into the rotor and connect it to the output shaft assembly;

[0034] The output shaft assembly is moved out of the inner cavity of the rotor by a linear drive mechanism.

[0035] The gearbox and generator assembly of the above-mentioned wind turbine and the disassembly method thereof, the output shaft assembly is an independently removable component. During the disassembly of the output shaft assembly, the rotor is installed on the housing of the gearbox through the connecting tooling, and the rotor is suspended and fixed on the housing of the gearbox so that the transition flange no longer bears gravity. Then the transition flange is disassembled to form a maintenance channel, and finally the output shaft assembly is disassembled. The inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, and the output shaft assembly can be taken out from the rotor. This part of the operation can be completed in the cabin without the need to disassemble the gearbox generator components as a whole. Since the weight of the output shaft assembly, transition flange, etc. is much smaller than the weight of the gearbox-generator integrated assembly, there is no need to rent a large crane or lifting ship, and the cabin of the gearbox output sun gear and output shaft components with the highest failure rate can be quickly disassembled and reassembled, thereby simplifying the maintenance work of the gearbox-generator assembly, greatly reducing the difficulty and cost of maintenance, and shortening the maintenance cycle, further reducing the loss of power generation due to downtime of the unit, and ultimately improving the competitiveness of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0037] Figure 1 A schematic diagram of the structure of a gearbox and a generator assembly of a wind turbine generator set in one embodiment;

[0038] Figure 2 for Figure 1 A schematic diagram of the structure of the output shaft assembly;

[0039] Figure 3 for Figure 1Schematic diagram of the structure of the generator transition flange;

[0040] Figure 4 for Figure 1 Schematic diagram of the generator rotor being installed on the gearbox housing through the connecting fixture;

[0041] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0042] Figure 6 This is a schematic diagram of designing positioning holes on the gear box body;

[0043] Figure 7 This is a schematic diagram of the maintenance hole on the generator rotor;

[0044] Figure 8 is a flow chart of a method for disassembling a gearbox and a generator assembly of a wind turbine generator set in one embodiment;

[0045] Fig. 9 This is a schematic diagram for removing the accessories of the generator rear cover;

[0046] Fig.10 It is a schematic diagram of installing the fixing tool in the positioning hole and the maintenance hole;

[0047] Fig.11 It is a schematic diagram of installing threaded fasteners in a fixed tooling;

[0048] Fig.12 This is a schematic diagram of the completed installation of the connecting tooling;

[0049] Fig.13 This is a schematic diagram for removing the brake disc bracket;

[0050] Fig.14 This is a schematic diagram for disassembling the transition flange;

[0051] Fig.15 Schematic diagram for removing the output shaft assembly.

[0052] Reference numerals:

[0053] 10-gearbox, 11-output shaft assembly, 111-bearing seat, 112-output shaft, 113-output stage sun gear, 114-output shaft bearing, 115-oil supply ring, 116-sealing ring, 117-end cover, 12-box, 121-positioning hole, 13-fixed support, 20-generator, 21-rotor, 22-transition flange, 23-rotor hub, 24-maintenance hole, 25-rear cover accessories, 26-operating space, 27-brake disc bracket, 30-connecting tooling, 31-fixed tooling, 311-through hole, 32-threaded fastener, 322-limiting head, 33-locking nut, 40-hanging fixture, 41-hanging bracket, 411-crossbeam, 412-vertical rod, 413-boom, 414-connecting plate, 42-hanging rope. DETAILED DESCRIPTION

[0054] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the invention is not limited by the specific implementation disclosed below.

[0055] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0057] See also Figure 1 In one embodiment, a gearbox and generator assembly of a wind turbine generator system includes a gearbox 10 and a generator 20 .

[0058] The gearbox 10 has an output shaft assembly 11, and the output shaft assembly 11 is detachably connected to the housing 12 of the gearbox 10. The output shaft assembly 11 is integrated into a whole, and the output shaft assembly 11 can be independently disassembled and assembled as a whole. During maintenance, it is only necessary to remove the connection between the output shaft assembly 11 and the housing 12, and all parts of the output shaft assembly 11 can be removed from the rear end of the gearbox 10 in an integrated manner, so as to achieve rapid independent maintenance and reassembly.

[0059] Please also read Figure 2 In one embodiment, the output shaft assembly 11 includes a bearing seat 111 and an output shaft 112. The bearing seat 111 is detachably mounted on the housing 12 of the gearbox 10. The output shaft 112 is mounted on the bearing seat 111. The bearing seat 111 constitutes the maximum outer diameter of the output shaft assembly 11. Specifically, the bearing seat 111 is mounted on the rear housing of the gearbox 10 by bolts.

[0060] Furthermore, the output shaft assembly 11 further includes an output stage sun gear 113, an output shaft bearing 114, an oil supply ring 115, a sealing ring 116 and an end cover 117. The output shaft 112 is rotatably mounted on the bearing seat 111 through the output shaft bearing 114, the output stage sun gear 113 is connected to the output shaft 112, the oil supply ring 115 and the sealing ring 116 are mounted on the output shaft 112, and the end cover 117 is mounted on the bearing seat 111, and the end cover 117 is used to limit the output shaft bearing 114.

[0061] Please also read Figure 3 The generator 20 has a rotor 21 and a transition flange 22, and the housing of the generator 20 is connected to the housing 12 of the gearbox 10. The transition flange 22 is installed in the rotor 21, and the transition flange 22 is detachably connected to the output shaft assembly 11.

[0062] Specifically, the rotor 21 includes a rotor hub 23, the rotor hub 23 is located in the inner cavity of the rotor 21, and the transition flange 22 is detachably connected to the rotor hub 23. Specifically in this embodiment, the transition flange 22 is connected to the rotor hub 23 of the rotor 21 by bolts, and the transition flange 22 is connected to the output shaft 112 by bolts or pins.

[0063] Please also read Figure 4 The rotor 21 is configured to be mounted on the housing 12 of the gearbox 10 through the connecting tool 30, so that the weight of the rotor 21 can be transferred from the output shaft 112 to the housing 12 of the gearbox 10. Then, the internal transition flange 22 and other components of the rotor 21 of the generator 20 can be removed to form a maintenance channel for the output components of the gearbox 10.

[0064] The inner cavity of the rotor 21 is larger than the maximum outer diameter of the output shaft assembly 11. Before disassembling the output shaft assembly 11, the transition flange 22 is first removed, and the output shaft assembly 11 can be disassembled and reassembled through the inner cavity of the rotor hub 23. Specifically, the inner cavity of the rotor hub 23 is larger than the maximum outer diameter of the output shaft assembly 11, that is, the inner cavity of the rotor hub 23 is larger than the outer diameter of the bearing seat 111.

[0065] Please also read Figure 5In one embodiment, a positioning hole 121 is provided on the housing 12 of the gearbox 10, and a maintenance hole 24 is provided on the rotor 21. The positioning hole 121 and the maintenance hole 24 correspond one to one. The connecting tool 30 is passed through the positioning hole 121 and the maintenance hole 24 to install the rotor 21 on the housing 12 of the gearbox 10.

[0066] In one embodiment, the connecting tool 30 includes a fixing tool 31, a threaded fastener 32 and a locking nut 33. The fixing tool 31 is generally a hollow cylindrical structure, and the fixing tool 31 is provided with a through hole 311 along its axial direction. The front end of the fixing tool 31 is provided with an installation chamfer, which is conducive to initial guidance and positioning, aligning the positioning hole 121, and guiding the installation process. The diameter of the fixing tool 31 is smaller than the size of the positioning hole 121 and the maintenance hole 24. After the fixing tool 31 is inserted into the positioning hole 121 and the maintenance hole 24, a small gap is formed, which can reduce the difficulty of assembly.

[0067] The threaded fastener 32 is inserted into the through hole 311 of the fixing fixture 31, one end of the threaded fastener 32 extends out of the fixing fixture 31 and is threadedly connected to the positioning hole 121, and the other end of the threaded fastener 32 is axially limited by the fixing fixture 31 through the limit head 322 to prevent the threaded fastener 32 from being separated from the fixing fixture 31. Specifically, when the threaded fastener 32 is a bolt, the limit head 322 is the head of the bolt, and when the threaded fastener 32 is a screw, the limit head 322 is a nut, and the nut is screwed on the end of the screw.

[0068] The locking nut 33 is installed on the fixing fixture 31, and the locking nut 33 is used to limit the rotor 21. Specifically, the fixing fixture 31 is inserted into the positioning hole 121 and the maintenance hole 24, and the rear end of the fixing fixture 31 extends out of the maintenance hole 24. The rear end of the fixing fixture 31 is provided with an external thread, and the locking nut 33 is screwed on the rear end of the fixing fixture 31, and the locking nut 33 is tightly attached to the end surface of the maintenance hole 24 to prevent the rotor 21 from slipping off the fixing fixture 31. Among them, since the transmission chain of the wind turbine set is installed at an angle, the gravity of the rotor 21 of the generator 20 generates a component force in the axial direction, ensuring that the axial component force is greater than the axial tension generated by the tightening torque of the locking nut 33, and finally achieving the positioning of the rotor 21 of the generator 20.

[0069] Please also read Figure 6 and Figure 7 In one embodiment, a fixing support 13 is provided on the housing 12 of the gearbox 10, and a positioning hole 121 is provided on the fixing support 13. A maintenance hole 24 is provided on the rotor hub 23, and a fixing support 13 is provided on the rotor hub 23, and a positioning hole 121 is provided on the fixing support 13. Specifically, 8 fixing supports 13 distributed circumferentially are designed on the housing 12 of the gearbox 10, and a positioning hole 121 is designed in each fixing support 13, and 8 corresponding fixing supports 13 are also provided on the corresponding rotor hub 23, and a maintenance hole 24 is designed in each fixing support 13.

[0070] Of course, in other embodiments, the positioning holes 121 can also be directly designed on the housing 12 of the gearbox 10, and the maintenance holes 24 can be directly designed on the rotor hub 23. The number of positioning holes 121 and maintenance holes 24 can be specifically selected according to actual needs, such as according to the specifications and total weight of the rotor 21. The positioning holes 121 and maintenance holes 24 can be evenly distributed circumferentially, or can be designed to be symmetrically arranged up and down.

[0071] See also Figure 8 The present invention also provides a method for disassembling a gearbox and a generator assembly of a wind turbine, which is used to disassemble the output shaft assembly 11 in the gearbox and the generator assembly of the wind turbine for repair or replacement. Specifically, the disassembly method includes the following steps:

[0072] Step S110 : dismantling the rear cover attachment 25 of the generator 20 to expose the operating space 26 inside the rotor 21 .

[0073] Please also read Fig. 9 Specifically, the protective cover at the rear end of the generator 20 is disassembled, and the brake, brake disc and other accessories are removed. After the disassembly is completed, the operating space 26 can be formed.

[0074] In one embodiment, before step S110, the method further includes: positioning the transmission chain of the wind turbine set so that the positioning hole 121 is aligned with the maintenance hole 24, and locking the wind wheel. Before maintenance, the transmission chain of the wind turbine set must be fixed to prevent the gearbox 10 and the generator 20 from rotating or swaying, which may affect the maintenance operation. The fixed transmission chain can be achieved by using a wind wheel lock. When positioning, the transmission chain is started to rotate slowly until the maintenance positioning hole 121 of the rear housing 12 of the gearbox 10 is basically aligned with the maintenance positioning hole 121 on the rotor hub 23 of the generator 20, and then the wind wheel is locked.

[0075] Step S120 : installing the rotor 21 of the generator 20 on the housing 12 of the gearbox 10 through the connecting tool 30 .

[0076] Specifically, the fixing fixture 31 is inserted into the positioning hole 121 and the maintenance hole 24, and then the threaded fastener 32 is inserted into the positioning hole 121 through the through hole 311 of the fixing fixture 31, and one end of the threaded fastener 32 is threadedly connected to the positioning hole 121, and the other end of the threaded fastener 32 is axially limited with the fixing fixture 31 through the limit head 322. The locking nut 33 is installed at the end of the fixing fixture 31, so that the locking nut 33 is close to the end face of the maintenance hole 24 and the required torque is applied, so that the weight of the rotor 21 can be transferred from the output shaft 112 to the housing 12 of the gearbox 10. Since the transmission chain of the wind turbine is installed at an angle, the gravity of the rotor 21 of the generator 20 generates a component force in the axial direction, ensuring that the axial component force is greater than the axial tension generated by the tightening torque of the locking nut 33, and finally achieving the positioning of the rotor 21 of the generator 20.

[0077] Please also read Fig.10 In one specific embodiment, the above steps are specifically as follows: remove the end cover 117 on the maintenance hole 24 of the rotor hub 23 of the generator 20, and install all the fixing tools 31 in sequence. During installation, since the maintenance hole 24 on the rotor hub 23 and the positioning hole 121 on the housing 12 of the gear box 10 have been initially aligned, the fixing tool 31 can be inserted into the maintenance hole 24 on the rotor hub 23 of the generator 20 at this time; then fine-tune the rotation angle of the transmission chain until the fixing tool 31 is inserted into the positioning hole 121 of the housing 12 of the gear box 10.

[0078] Please also read Fig.11 After the fixing fixture 31 is installed in the positioning hole 121, the threaded fastener 32 is screwed into the positioning hole 121 through the middle through hole 311, and the required torque is applied to fix the fixing fixture 31 to the housing 12. After all the fixing fixtures 31 are installed in the positioning holes 121 and the threaded fasteners 32 are all tightened, the gravity of the rotor 21 of the generator 20 can be borne by the housing 12 of the gearbox 10. Since the front end of the fixing fixture 31 is designed with a chamfer, it can play a guiding role during assembly and help smooth installation.

[0079] Please also read Fig.12 , and then screw the locking nut 33 into the rear end of the fixing fixture 31 in sequence, so that it is close to the end plane of the maintenance hole 24 of the generator 20 rotor 21, and apply the required torque. Since the wind turbine transmission chain is installed at an angle, the gravity of the generator 20 rotor 21 generates a component force in the axial direction, ensuring that the axial component force is greater than the axial tension generated by the tightening torque of the locking nut 33, and finally achieving the positioning of the generator 20 rotor 21.

[0080] Step S130: dismantle the transition flange 22 and move it outside the generator 20.

[0081] Please also read Fig.13Specifically, after the rotor 21 of the generator 20 is fixed, the brake disc bracket 27 installed on the transition flange 22 is first disassembled. First, all the connecting bolts are loosened, and then the brake disc bracket 27 is supported by the sling 40; then all the loosened bolts are removed, and the brake disc bracket 27 is moved out of the generator 20 by the sling 40 and placed in a safe position in the cabin.

[0082] Please also read Fig.14 After removing the brake disc bracket 27, first remove all the connecting bolts between the transition flange 22 and the rotor hub 23, as well as the connecting bolts between the transition flange 22 and the output shaft 112 that partially block the installation of the hanger 40. Then use the mounting bolt holes of the brake disc bracket 27 on the transition flange 22 to connect the transition flange 22 to the hanger 40, and then remove the remaining connecting bolts between the transition flange 22 and the output shaft 112. At this time, the transition flange 22 can be removed and moved out of the generator 20 and placed in a safe position in the nacelle.

[0083] In one embodiment, the hanger 40 includes a hanger 41 and a hanging rope 42 connected to the hanger 41, the hanger 41 has a crossbeam 411, a vertical rod 412 and a hanging arm 413 parallel to the crossbeam 411, the vertical rod 412 connects the hanging arm 413 and the crossbeam 411, and the hanging rope 42 is connected to the crossbeam 411. When the brake disc bracket 27 and the transition flange 22 are hoisted, the hanging arm 413 extends into the rotor 21 of the generator 20 and is connected to the brake disc bracket 27 and the transition flange 22.

[0084] Step S140 : disassembling the output shaft assembly 11 , and moving the output shaft assembly 11 out of the generator 20 through the cavity in the rotor 21 .

[0085] Specifically, the output shaft assembly 11 and the housing 12 of the gear box 10 are disassembled, the arm 413 of the hanger 40 is extended into the rotor 21 to connect with the output shaft assembly 11, and the output shaft assembly 11 is moved out of the inner cavity of the rotor 21 using a linear drive mechanism.

[0086] Please also read Fig.15 In a specific embodiment, the above steps are specifically as follows: first, the connecting bolts between the bearing seat 111 and the gear box 10 housing 12 need to be completely removed, and then the connecting plate 414 is installed at the front end of the arm 413 of the sling 40, and the connecting plate 414 and the output shaft 112 are firmly fixed together with bolts. After the sling 40 and the output shaft assembly 11 are fixed, the output shaft assembly 11 can be gradually withdrawn from the mounting hole of the gear box 10 housing 12 by tools such as hydraulic cylinders and linear motors, and then removed from the generator 20 and safely placed. Since the output shaft assembly 11 is heavy, the binding position of the sling rope 42 of the sling 40 needs to be moved forward so that the force center of gravity of the sling rope 42 is basically consistent with the center of gravity of the output shaft assembly 11 in the vertical direction.

[0087] The gearbox and generator assembly of the above-mentioned wind turbine and the disassembly method thereof, the disassembly operation of the output shaft assembly 11 can be completed in the nacelle, without the need to disassemble the gearbox 10 generator 20 components as a whole. Since the weight of the output shaft assembly 11, the transition flange 22, etc. is much less than the weight of the gearbox 10-generator 20 integrated assembly, there is no need to rent a large crane or a lifting ship, and the nacelle of the gearbox 10 output sun gear and the output shaft 112 components with the highest failure rate can be quickly disassembled and reassembled, thereby simplifying the maintenance work of the gearbox 10-generator 20 assembly, greatly reducing the difficulty and cost of maintenance, and shortening the maintenance cycle, further reducing the loss of power generation due to downtime of the unit, and ultimately improving the competitiveness of the unit.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A gearbox and generator assembly of a wind turbine, characterized in that: include: A gear box, wherein the gear box has an output shaft assembly, and the output shaft assembly is detachably connected to a housing of the gear box; A generator, comprising a rotor and a transition flange, wherein the transition flange is detachably mounted in the rotor, and the transition flange is detachably connected to the output shaft assembly; The rotor is configured to be mounted on the housing of the gearbox through a connecting tool, and the inner cavity of the rotor is larger than the maximum outer diameter of the output shaft assembly, so that after the transition flange is disassembled, the output shaft assembly can be taken out of the rotor; The gearbox body is provided with a positioning hole, the rotor is provided with a maintenance hole, and the connecting tool is used to penetrate the positioning hole and the maintenance hole to install the rotor on the gearbox body; The connecting tool comprises a fixing tool, a threaded fastener and a locking nut. The fixing tool is inserted into the positioning hole and the maintenance hole. The fixing tool is provided with a through hole in the axial direction. One end of the threaded fastener is threadedly connected in the positioning hole through the through hole. The other end of the threaded fastener is axially limited with the fixing tool through a limiting head. The locking nut is installed on the fixing tool to limit the rotor. The transmission chain of the wind turbine is installed at an angle, and the gravity of the generator rotor generates a component force in the axial direction.

2. The gearbox and generator assembly of a wind turbine according to claim 1, characterized in that: The output shaft assembly includes a bearing seat and an output shaft mounted on the bearing seat. The bearing seat is detachably mounted on the housing of the gear box, and the transition flange is detachably connected to the output shaft.

3. The gearbox and generator assembly of a wind turbine according to claim 1, characterized in that: The rotor comprises a rotor hub, the rotor hub is installed in the rotor, the transition flange is detachably connected to the rotor hub, and the inner cavity of the rotor hub is larger than the maximum outer diameter of the output shaft assembly.

4. A method for disassembling the gearbox and generator assembly of a wind turbine according to any one of claims 1 to 3, characterized in that: The following steps are involved: Remove the accessories on the generator rear cover to reveal the operating space inside the rotor; Install the rotor of the generator on the gearbox body through the connecting tool; Dismantle the transition flange and move it outside the generator; The output shaft assembly is disassembled and moved out of the generator through the cavity in the rotor.

5. The method for disassembling the gearbox and generator assembly of a wind turbine according to claim 4, characterized in that: Before the step of removing the generator rear cover attachment to expose the operating space in the rotor, the following steps are also included: Position the transmission chain of the wind turbine so that the positioning hole is aligned with the maintenance hole and the wind wheel is locked.

6. The method for disassembling the gearbox and generator assembly of a wind turbine according to claim 5, characterized in that: The step of installing the rotor of the generator on the housing of the gearbox through the connecting tool specifically includes: Insert the fixing tool into the positioning hole and the maintenance hole; Insert the threaded fastener into the positioning hole through the through hole of the fixing tool, thread one end of the threaded fastener is connected to the positioning hole, and the other end of the threaded fastener is axially limited with the fixing tool through a limit head; Install the locking nut on the end of the fixing fixture, make the locking nut close to the end face of the maintenance hole and apply the required torque.

7. The method for disassembling the gearbox and generator assembly of a wind turbine according to claim 4, characterized in that: The steps of disassembling the transition flange and removing it outside the generator are specifically as follows: Remove the connecting bolts between the transition flange and the rotor; Extend the lifting arm of the lifting device into the rotor and connect it to the transition flange; Remove the connecting bolts between the filter flange and the output shaft, and use the lifting tool to move the transition flange out of the generator.

8. The method for disassembling the gearbox and generator assembly of a wind turbine according to claim 4, characterized in that: The steps of disassembling the output shaft assembly and moving the output shaft assembly out of the generator through the cavity in the rotor are specifically as follows: Disassemble the output shaft assembly and the gearbox housing; The arm of the lifting device is extended into the rotor to be connected with the output shaft assembly; and the output shaft assembly is moved out of the inner cavity of the rotor by using a linear drive mechanism.

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