A method for removing a main shaft bearing of a wind turbine generator

Abstract

A kind of main shaft bearing dismounting method for wind turbine unit, comprising the following steps: cutting the main shaft part where bearing is located, and retaining a section of main shaft on one side of bearing;Install fixed support on the outer ring of bearing, install main shaft clamp on the retained section of main shaft;Set machine tool cutter head on the surface of main shaft on the other side of bearing, rotate the main shaft and bearing inner ring together by main shaft clamp, make the main shaft on the other side of bearing into hollow thin-walled structure;Remove main shaft clamp and fixed support, install drawing tooling on the retained section of main shaft, remove main shaft thin-walled piece from bearing inner ring by using the center hole on main shaft.The present application overcomes the shortcomings of prior art, the whole process is only to deal with the scrapped main shaft, without disassembling the bearing itself, ensures the integrity of the bearing without damage, thereby ensuring the subsequent reuse conditions of the bearing.

Description

Technical Field

[0001] This invention relates to the field of wind turbine maintenance technology, specifically to a method for removing the main shaft bearing of a wind turbine. Background Technology

[0002] Currently, a large number of large wind turbine generators need to be returned to the factory for maintenance. During the maintenance process, the bearings need to be disassembled for subsequent recycling and reuse.

[0003] However, because bearings are assembled using cold or hot fitting methods, the interference fit between the bearing and the shaft is relatively large. Traditional bearing disassembly methods typically involve centrifugally rotating the outer ring, removing the rollers from the side first, then removing the outer ring, and finally heating the inner ring before removing it. This process easily damages the rollers, the raceways of the inner and outer rings, and the roller cage. Furthermore, the inner surface of the inner ring is easily scratched during removal. When reusing bearings, the subsequent steps require reversing the process to assemble the inner ring, outer ring, and rollers together, further increasing the probability of damage to the rollers and raceways. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for removing the main shaft bearing of a wind turbine. This method overcomes the deficiencies of existing technologies, is rationally designed, and the entire process only involves processing the scrapped main shaft without disassembling the bearing itself, ensuring the integrity and undamaged nature of the bearing and thus guaranteeing its subsequent reuse.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for removing the main shaft bearing of a wind turbine includes the following steps:

[0007] Step S1: Cut the spindle section where the bearing is located, and retain a section of the spindle on one side of the bearing;

[0008] Step S2: Install a fixing bracket on the outer ring of the bearing and fix the fixing bracket on the machine tool; install a spindle fixture on the reserved section of the spindle;

[0009] Step S3: Set the machine tool cutter head on the spindle surface on the other side of the bearing. Control the spindle fixture to rotate, so that the spindle and the inner ring of the bearing rotate together, so that the spindle on the other side of the bearing is machined into a hollow thin-walled structure, and the section of the spindle used to install the spindle fixture is left unmachined.

[0010] Step S4: Remove the spindle fixture and fixed bracket, install the drawing tool on the remaining section of the spindle, and remove the thin-walled part of the spindle from the inner ring of the bearing.

[0011] Preferably, in step S2, the fixed bracket includes an outer frame, which is a square structure. Each of the four sides of the outer frame is connected to an adjusting screw by a thread. The end of the adjusting screw passes through the outer frame and abuts against the outer ring of the bearing.

[0012] Preferably, when installing the fixed bracket, the outer frame is fitted onto the outer ring of the bearing, and then the four adjusting screws are rotated to adjust the position of the bearing so that it is coaxial with the rotation axis of the machine tool.

[0013] Preferably, in step S4, the drawing fixture includes a mounting bracket and a lead screw. The mounting bracket has a U-shaped structure. Both ends of the mounting bracket abut against the inner ring of the bearing. A through hole is provided in the middle of the mounting bracket. A limit plate is provided at one end of the lead screw. The limit plate is located in the thin-walled cavity of the spindle. The other end of the lead screw passes through the central hole and the through hole of the spindle in sequence and is connected to a nut by a thread.

[0014] By rotating the nut, the lead screw is moved away from the bearing, and then the pulling action of the limiting plate causes the entire thin wall of the spindle to be pulled out from the inner ring of the bearing.

[0015] This invention provides a method for removing the main shaft bearing of a wind turbine. It offers the following advantages: the entire process only involves processing the scrapped main shaft, eliminating the need to disassemble the bearing itself, thus ensuring the bearing remains intact and undamaged, and guaranteeing its subsequent reuse. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the accompanying drawings used in the description of the prior art will be briefly introduced below.

[0017] Figure 1 The flowchart of the present invention; wherein the arrows indicate the direction of the disassembly steps;

[0018] Figure 2 A schematic diagram of the installation of the fixed bracket and the spindle clamp in step S2 of the present invention;

[0019] Figure 3 A cross-sectional view of the installation of the fixed bracket and the spindle clamp in step S2 of the present invention;

[0020] Figure 4 A schematic diagram of the structure after processing in step S3 of this invention;

[0021] Figure 5 A schematic diagram of the installation of the drawing tool in step S4 of the present invention;

[0022] Figure 6 A cross-sectional view of the drawing tool installed in step S4 of this invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] like Figure 1-6 As shown, a method for removing the main shaft bearing of a wind turbine includes the following steps:

[0025] Step S1: Cut the spindle section where the bearing is located, and retain a section of the spindle on one side of the bearing;

[0026] Step S2: Install a fixing bracket on the outer ring of bearing 8 and fix the fixing bracket on the machine tool; install spindle fixture 11 on the reserved section of spindle;

[0027] Step S3: Set the machine tool cutter head 10 on the spindle surface on the other side of the bearing 8, and drive the spindle fixture 11 to rotate by the motor, so that the spindle 9 and the inner ring of the bearing rotate together, so that the spindle 9 on the other side of the bearing 8 is machined into a hollow thin-walled structure, thereby greatly reducing the interference load, and leaving the section of the spindle 9 used to install the spindle fixture unmachined.

[0028] Step S4: Remove the spindle clamp 11 and the fixed bracket, install the pulling tool on the remaining section of the spindle 9, and use the center hole on the spindle 9 to remove the thin-walled part of the spindle from the inner ring of the bearing.

[0029] The entire process only involves processing the scrapped spindle, without disassembling the bearing itself, ensuring the bearing remains intact and undamaged, thus guaranteeing its subsequent reuse.

[0030] In this embodiment, in step S2, the fixed bracket includes an outer frame 1, which is a square structure. Each of the four sides of the outer frame 1 is connected to an adjusting screw 2 by a thread. The end of the adjusting screw 2 passes through the outer frame 1 and abuts against the outer ring of the bearing.

[0031] When installing the aforementioned fixed bracket, first, the outer frame 1 is fitted onto the outer ring of the bearing 8, and then the outer frame 1 is fixed to the machine tool to prevent the bearing 8 from falling off and to increase the overall rigidity. Then, the four adjusting screws 2 are rotated to adjust the position of the bearing 8 so that it is coaxial with the rotation axis of the machine tool, so that the machine tool cutter head 10 can cut the spindle into a hollow thin-walled structure.

[0032] In this embodiment, in step S4, the pulling fixture includes a mounting bracket 3 and a lead screw 4. The mounting bracket 3 has a U-shaped structure, with both ends abutting against the inner ring of the bearing. A through hole is provided in the middle of the mounting bracket 3. A limiting plate 5 is provided at one end of the lead screw 4, which is located inside the thin-walled cavity of the spindle 9. The other end of the lead screw 4 passes through the central hole and the through hole of the spindle 9 in sequence and is connected to a nut 6 by threads. By rotating the nut 6, the lead screw 4 is moved away from the bearing 8, and then the pulling action of the limiting plate 5 causes the entire thin-walled spindle to be pulled away from the inner ring of the bearing, ensuring the integrity of the bearing without damage.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for removing the main shaft bearing of a wind turbine generator, characterized in that: Includes the following steps: Step S1: Cut the spindle section where the bearing is located, and retain a section of the spindle on one side of the bearing; Step S2: Install a fixing bracket on the outer ring of the bearing and fix the fixing bracket on the machine tool; install a spindle fixture on the reserved section of the spindle; Step S3: Set the machine tool cutter head on the spindle surface on the other side of the bearing. Control the spindle fixture to rotate, so that the spindle and the inner ring of the bearing rotate together, so that the spindle on the other side of the bearing is machined into a hollow thin-walled structure, and the section of the spindle used to install the spindle fixture is left unmachined. Step S4: Remove the spindle fixture and fixed bracket, install the drawing tool on the remaining section of the spindle, and remove the thin-walled part of the spindle from the inner ring of the bearing.

2. The method for removing the main shaft bearing of a wind turbine according to claim 1, characterized in that: In step S2, the fixed bracket includes an outer frame, which is a square structure. Each of the four sides of the outer frame is connected to an adjusting screw by a thread. The end of the adjusting screw passes through the outer frame and abuts against the outer ring of the bearing.

3. The method for removing the main shaft bearing of a wind turbine according to claim 2, characterized in that: When installing the fixed bracket, the outer frame is fitted onto the outer ring of the bearing, and then the four adjusting screws are rotated to adjust the position of the bearing so that it is coaxial with the rotation axis of the machine tool.

4. The method for removing the main shaft bearing of a wind turbine according to claim 1, characterized in that: In step S4, the drawing fixture includes a mounting bracket and a lead screw. The mounting bracket has a U-shaped structure. Both ends of the mounting bracket abut against the inner ring of the bearing. A through hole is provided in the middle of the mounting bracket. A limit plate is provided at one end of the lead screw. The limit plate is located in the thin-walled cavity of the spindle. The other end of the lead screw passes through the central hole and the through hole of the spindle in sequence and is connected to a nut by a thread. By rotating the nut, the lead screw is moved away from the bearing, and then the pulling action of the limiting plate causes the entire thin wall of the spindle to be pulled out from the inner ring of the bearing.

Images