Method for replacing bearing on wind driven generator tower

Abstract

The invention provides a method for replacing a bearing on a wind driven generator tower. The method comprises the following steps that S1, accessories at the N / D end of a motor are disassembled; s2, air gap filler strips are cushioned between the stator and the rotor; s3, mounting a tower bearing replacement tool, leveling and tensioning the axle suspension bush through a screw rod of the tool, adjusting the transverse position of the rotor, jacking the axle suspension bush together with the rotor by using a jack, adjusting the transverse and vertical positions of the rotor, and detecting the uniformity of air gaps; s4, disassembling an end cover of the N / D end of the motor, installing an inner side tool, disassembling an outer side tool, lifting out the end cover, and replacing a bearing; and S5, after the N / D end cover of the motor is reinstalled according to requirements, the air gap filler strip is drawn out, and the N / D end accessory is installed. According to the method, the overall tower descending cost of the motor is saved, the maintenance efficiency of motor bearing replacement and the like is improved, the safety risk possibly existing in the overall tower descending overturning disassembly process of the motor is avoided, and the product quality in the maintenance process of motor replacement and the like is better guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of generator maintenance, and in particular to a method for replacing bearings on a wind turbine tower. Background Art

[0002] As the wind power industry continues to expand, it is also placing increasing demands on reducing costs and increasing efficiency. Reducing maintenance costs is a key component of this. Relying on technological innovation to achieve this reduction is essential for reliable operation of wind turbines throughout their lifecycle and is a necessary choice for enhancing the competitiveness of wind power companies and the entire wind power industry.

[0003] The wind turbine's tower-mounted bearing replacement is an important part of its maintenance and cost reduction through technological innovation. In the wind turbine tower nacelle, a complete set of reliable tower-mounted bearing replacement methods and tooling are used to fix the motor rotor on the stator frame, and the relative position of the stator and rotor can be adjusted. Through technological innovation, the motor bearings are replaced in the tower nacelle to achieve maintenance and cost reduction and ensure product quality.

[0004] Currently, the most common method is to remove the motor as a whole for maintenance work such as end cap removal and bearing replacement. Furthermore, disassembly and replacement procedures are performed in reverse order of the assembly process, requiring the motor to be completely disassembled and flipped vertically for disassembly and replacement. This approach has the following disadvantages: 1. The cost of removing the motor as a whole is high; 2. Maintenance such as replacement by removing the motor as a whole is inefficient; 3. Removing the motor by flipping it over may pose safety risks; and 4. Maintenance such as replacement by removing the motor as a whole requires the motor to be completely disassembled and flipped, which is complex and may introduce additional quality risks, hindering product quality assurance. Summary of the Invention

[0005] To solve the above problems, the present invention discloses a method for replacing bearings on a wind turbine tower, which can overcome the rotor force, fix the motor rotor on the stator base, and achieve adjustable relative positions of the stator and rotor, meeting the needs of replacing bearings on the tower.

[0006] The specific plan is as follows: A method for replacing a bearing on a wind turbine tower comprises the following steps: S1. Remove the accessories at the N / D end of the motor; S2, air gap spacer between stator and rotor; S3. Install the bearing replacement tooling on the tower and ensure that the tooling is securely fastened to the machine base and rotor shaft as required. Use the tooling screw to level and tighten the bearing bushings and adjust the lateral position of the rotor. Use a jack to lift the bearing bushings and the rotor, adjust the lateral and vertical positions of the rotor, and check for uniform air gaps. S4. Remove the motor N / D end cover, install the inner tooling, remove the outer tooling, lift out the end cover, and replace the bearing; S5. After reinstalling the motor N / D end cover as required, remove the air gap gasket and install the N / D end accessories.

[0007] Furthermore, in step S2, the air gap spacer is a copper bar.

[0008] Furthermore, in step S2, air gap spacers are placed at the 3 o'clock, 6 o'clock, 9 o'clock and 12 o'clock positions of the stator and rotor air gap from the N end to the D end.

[0009] Furthermore, in step S3, the bearing replacement tooling includes a base, a jack is provided in the middle of the top surface of the base, and adjustment components are symmetrically provided on both sides of the top surface. The upper end of the adjustment component is rotatably connected to the bearing bushing, and the lower end is rotatably connected to the base.

[0010] Furthermore, the adjustment assembly includes a double-threaded screw and threaded sleeves threadedly connected to both ends thereof, the threaded sleeve at the upper end is rotatably connected to the bearing bushing, and the threaded sleeve at the lower end is rotatably connected to the base.

[0011] The beneficial effects of the present invention are: 1. Save the cost of removing the entire motor from the tower; the present invention can realize the replacement of bearings on the fan tower without removing the tower.

[0012] 2. Improve the maintenance efficiency of motor bearing replacement; the present invention can realize the replacement of bearings on the wind turbine tower, which is more efficient.

[0013] 3. Avoid the safety risks that may occur when the motor is turned over and disassembled under the tower; the present invention can realize the replacement of bearings on the wind turbine tower without turning over and disassembling the tower, which is safer to operate.

[0014] 4. Better guarantee of product quality during maintenance processes such as motor replacement; the present invention can realize the replacement of bearings on the wind turbine tower, which is easier to operate and better guarantees product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural diagram of the tooling in the present invention.

[0016] Figure 2 It is a two-dimensional structural diagram of the tooling in the present invention.

[0017] List of reference numerals: 1- jack, 2- threaded sleeve, 3- double-threaded screw. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0019] As shown in the figure, the present application provides a method for replacing bearings on a wind turbine tower, comprising the following steps: S1. Remove the accessories at the N / D end of the motor; S2, air gap spacer between stator and rotor; S3. Install the bearing replacement tooling on the tower and ensure that the tooling is securely fastened to the machine base and rotor shaft as required. Use the tooling screw to level and tighten the bearing bushings and adjust the lateral position of the rotor. Use a jack to lift the bearing bushings and the rotor, adjust the lateral and vertical positions of the rotor, and check for uniform air gaps. S4. Remove the motor N / D end cover, install the inner tooling, remove the outer tooling, lift out the end cover, and replace the bearing; S5. After reinstalling the motor N / D end cover as required, remove the air gap gasket and install the N / D end accessories.

[0020] In this embodiment, in step S2, the air gap spacers are copper bars, and are placed at the 3 o'clock, 6 o'clock, 9 o'clock, and 12 o'clock positions of the stator and rotor air gaps from the N end to the D end.

[0021] In this embodiment, in step S3, the bearing replacement tooling includes a base, with a jack 1 positioned in the middle of the top surface of the base, and adjustment assemblies symmetrically positioned on either side of the top surface. The upper end of the adjustment assembly is rotatably connected to the bearing bushing, and the lower end is rotatably connected to the base. The adjustment assembly includes a double-threaded screw 3 and threaded sleeves 2 threadedly connected to its ends. The threaded sleeve at the upper end is rotatably connected to the bearing bushing, and the threaded sleeve at the lower end is rotatably connected to the base.

[0022] This invention solves the problem of replacing bearings in a wind turbine tower nacelle. Due to the unique rotor structure of wind turbines, rotor gravity, magnetic attraction, and other factors make maintenance work such as removing the motor end cap and replacing bearings difficult. Bearing replacement on the tower requires overcoming the forces acting on the rotor. This fixture overcomes these forces, securing the motor rotor to the stator frame and enabling adjustable relative position between the stator and rotor, meeting the requirements for bearing replacement on the tower.

[0023] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for replacing bearings on a wind turbine tower, characterized in that: The following steps are involved: S1. Remove the accessories at the N / D end of the motor; S2, air gap spacer between stator and rotor; S3. Install the bearing replacement tool on the tower. Use the screw on the tool to level and tighten the bearing bushing. Adjust the lateral position of the rotor. Use a jack to lift the bearing bushing together with the rotor. Adjust the lateral and vertical positions of the rotor and check for uniform air gap. S4. Remove the motor N / D end cover, install the inner tooling, remove the outer tooling, lift out the end cover, and replace the bearing; S5. After reinstalling the motor N / D end cover, remove the air gap gasket and install the N / D end accessories.

2. A method for replacing bearings on a wind turbine tower according to claim 1, characterized in that: In step S2, the air gap spacer is a copper bar.

3. The method for replacing bearings on a wind turbine tower according to claim 1, characterized in that: In step S2, air gap spacers are placed at the 3 o'clock, 6 o'clock, 9 o'clock and 12 o'clock positions of the stator and rotor air gap from the N end to the D end.

4. The method for replacing a bearing on a wind turbine tower according to claim 1, characterized in that: In step S3, the bearing replacement tooling includes a base, a jack is provided in the middle of the top surface of the base, and adjustment components are symmetrically provided on both sides of the top surface. The upper end of the adjustment component is rotatably connected to the bearing bushing, and the lower end is rotatably connected to the base.

5. A method for replacing bearings on a wind turbine tower according to claim 4, characterized in that: The adjusting assembly includes a double-threaded screw and threaded sleeves threadedly connected to both ends thereof, the threaded sleeve at the upper end is rotatably connected to the bearing bush, and the threaded sleeve at the lower end is rotatably connected to the base.

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