A method for disassembling a main shaft bearing of a wind turbine

Abstract

A method for disassembling a wind turbine main shaft bearing includes the following steps: S1: cutting the main shaft portion containing the bearing; S2: cutting a ring groove coaxially on the main shaft to divide it into an outer ring and an inner core; and removing the inner core; S3: machining the inner wall of the outer ring to reduce its thickness; S4: installing a tightening device on the outer ring to shrink it towards the shaft center. After the thin wall of the main shaft separates from the inner ring of the bearing, the outer ring is directly removed from the bearing. This invention overcomes the shortcomings of existing technologies. The entire process only involves processing the scrapped main shaft, without disassembling the bearing itself, ensuring the bearing's integrity and preventing damage, thus guaranteeing its subsequent reuse.

Description

Technical Field

[0001] This invention relates to the field of wind turbine maintenance technology, specifically to a method for disassembling 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 disassembling the main shaft bearing of a wind turbine generator. 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 disassembling a wind turbine main shaft bearing includes the following steps:

[0007] Step S1: Cut the spindle section where the bearing is located;

[0008] Step S3: The inner wall of the spindle is cut by machining to reduce the thickness of the outer ring of the spindle, so that the spindle is cut into a hollow outer ring structure.

[0009] Step S4: Install a tightening device at each of the two ends of the spindle outer ring to shrink the spindle outer ring toward the shaft. After the spindle thin wall separates from the bearing inner ring, remove the spindle outer ring directly from the bearing.

[0010] Preferably, in step S1, the cutting positions at both ends of the spindle are a certain distance away from the two sides of the bearing.

[0011] Preferably, before step S3, step S2 is included: cutting an annular groove coaxially on the spindle to divide the spindle into an outer ring and an inner core; and removing the inner core of the spindle.

[0012] Preferably, in step S4, the tightening device includes a mounting plate, four lead screws are uniformly fixedly connected to the circumference of the mounting plate, four through holes are opened on the outer ring of the main shaft, and the ends of the four lead screws pass through the four through holes and are connected to tightening nuts by threads.

[0013] By rotating the tightening nut, the entire circumference of the outer ring of the main shaft is compressed and uniformly contracted towards the axis to produce plastic deformation; then the tightening nut is rotated in the opposite direction to remove the tightening device from the outer ring of the main shaft; then the outer ring of the main shaft is removed from the bearing.

[0014] Preferably, the tightening device in step S4 includes an inner ring, an outer ring, and a tightening bolt. The outer surface of the inner ring is provided with a conical structure, and a pressing groove is provided on one side of the outer ring. The side surface of the pressing groove is provided with a conical structure that matches the outer surface of the inner ring, and the minimum inner diameter of the pressing groove is smaller than the minimum outer diameter of the inner ring. The inner ring has a plurality of threaded holes on its side, and the outer ring has a plurality of through holes on its side. The threaded holes correspond to the through holes, and the tightening bolt passes through the through holes and is connected to the threaded holes by threads.

[0015] By rotating the tightening bolt, the inner ring moves into the clamping groove. Through the compression effect of the conical structure of the clamping groove, the inner ring contracts inward, which in turn compresses the entire circumference of the outer ring of the spindle evenly. After the outer ring of the spindle separates from the inner ring of the bearing, the outer ring of the spindle is moved axially within the bearing. Then, the tightening bolt is rotated in the opposite direction to loosen the entire tightening device.

[0016] Preferably, in step S4, when the outer ring of the spindle is moved out of the bearing, it can be moved in stages. After moving to a certain distance, the tightening device is then fitted onto the outer ring of the spindle, and the tightening bolt is rotated to move the inner ring into the compression groove and shrink it. Then, the entire circumference of the outer ring of the spindle near the bearing is uniformly compressed again.

[0017] Preferably, in step S4, before installing the tightening device, the outer surface of the spindle outer ring on one side of the bearing is machined to reduce the outer diameter, and the bearing moves towards the spindle end with the smaller outer diameter.

[0018] This invention provides a method for disassembling the main shaft bearing of a wind turbine generator. 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

[0019] 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.

[0020] Figure 1The flowchart of the present invention; wherein the arrows indicate the direction of the disassembly steps;

[0021] Figure 2 A schematic diagram of the installation structure of the tightening device in Embodiment 3 of this invention;

[0022] Figure 3 A cross-sectional view of the tightening device in Embodiment 3 of the present 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] Example 1, as Figure 1 As shown, a method for disassembling a wind turbine main shaft bearing includes the following steps:

[0025] Step S1: Cut the spindle section where the bearing is located;

[0026] Step S2: Cut an annular groove coaxially on the spindle to divide the spindle into an outer ring and an inner core; and remove the inner core of the spindle.

[0027] Step S3: The inner wall of the spindle outer ring is cut by machining to reduce the thickness of the spindle outer ring;

[0028] Step S4: Install a tightening device at each of the two ends of the spindle outer ring to shrink the spindle outer ring toward the shaft. After the spindle thin wall separates from the bearing inner ring, remove the spindle outer ring directly from 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, before installing the tightening device in step S4, the outer surface of the spindle outer ring on one side of the bearing can be machined to reduce the outer diameter, and the bearing can move towards the spindle end with the smaller outer diameter.

[0031] In this embodiment, in step S1, the cutting positions at both ends of the spindle are spaced a certain distance from the sides of the bearing. This facilitates the subsequent installation of the tightening device to shrink the outer ring of the spindle, ensuring that the spindle can be more easily and directly removed from the bearing.

[0032] Example 2, as Figure 1As shown, as a further preferred embodiment, the tightening device in step S4 includes a mounting plate 1, four lead screws 2 are uniformly fixedly connected to the circumference of the mounting plate 1, and four through holes 4 are opened on the outer ring of the main shaft. The ends of the four lead screws 2 pass through the four through holes 4 respectively and are connected to tightening nuts 3 by threads.

[0033] By rotating the tightening nut 3, the entire circumference of the outer ring of the main shaft is compressed and uniformly contracted towards the axis to produce plastic deformation; then the tightening nut 3 is rotated in the opposite direction to remove the tightening device from the outer ring of the main shaft; then the outer ring of the main shaft is removed from the bearing.

[0034] Example 3, as Figure 2-3 As shown, as a further preferred embodiment, the tightening device in step S4 includes an inner ring 8, an outer ring 5, and a tightening bolt 7. The outer surface of the inner ring 8 is provided with a conical structure, and a pressing groove 6 is provided on one side of the outer ring 5. The side surface of the pressing groove 6 is provided with a conical structure that matches the outer surface of the inner ring 8, and the minimum inner diameter of the pressing groove 6 is smaller than the minimum outer diameter of the inner ring 8. A plurality of threaded holes are provided on the side of the inner ring 8, and a plurality of through holes are provided on the side of the outer ring 5. The threaded holes correspond to the through holes, and the tightening bolt 7 passes through the through holes and is connected to the threaded holes by threads.

[0035] By rotating the tightening bolt 7, the inner ring 8 moves into the clamping groove 6. Through the compression effect of the conical structure of the clamping groove 6, the inner ring 8 contracts inward, thereby uniformly compressing the entire circumference of the outer ring of the main shaft. After the thin wall of the main shaft separates from the inner ring of the bearing, the tightening bolt 7 is rotated in the opposite direction to move the outer ring of the main shaft axially within the bearing. Then, the tightening bolt 7 is rotated in the opposite direction to loosen the entire tightening device.

[0036] In Example 4, as a further preferred embodiment of Example 3, when the outer ring of the spindle is moved out of the bearing in step S4, it can be moved in stages. After moving to a certain distance, the tightening device is then fitted onto the outer ring of the spindle, and the tightening bolt 7 is rotated to move the inner ring 8 into the compression groove 6 to shrink, thereby uniformly compressing the entire circumference of the outer ring of the spindle near the bearing again.

[0037] 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 of disassembly of a wind turbine main shaft bearing, characterized in that: Includes the following steps: Step S1: Cut the spindle section where the bearing is located; the cut positions at both ends of the spindle are a certain distance away from the sides of the bearing; Step S2: Cut an annular groove coaxially on the spindle to divide the spindle into an outer ring and an inner core; and remove the inner core of the spindle. Step S3: The inner wall of the spindle is cut by machining to reduce the thickness of the outer ring of the spindle, so that the spindle is cut into a hollow outer ring structure. Step S4: Install a tightening device at each of the two ends of the spindle outer ring to shrink the spindle outer ring toward the shaft. After the spindle thin wall separates from the bearing inner ring, remove the spindle outer ring directly from the bearing. In step S4, the tightening device includes a mounting plate (1), and four lead screws (2) are evenly fixedly connected to the circumference of the mounting plate (1). Four through holes (4) are opened on the outer ring of the main shaft. The ends of the four lead screws (2) pass through the four through holes (4) respectively and are connected to tightening nuts (3) by threads. By rotating the tightening nut (3), the entire circumference of the outer ring of the main shaft is compressed and uniformly contracted towards the axis to produce plastic deformation; then the tightening nut (3) is rotated in the opposite direction to remove the tightening device from the outer ring of the main shaft; then the outer ring of the main shaft is removed from the bearing. Alternatively, the tightening device in step S4 includes an inner ring (8), an outer ring (5), and a tightening bolt (7). The outer surface of the inner ring (8) is provided with a conical structure, and a pressing groove (6) is provided on one side of the outer ring (5). The side surface of the pressing groove (6) is provided with a conical structure that matches the outer surface of the inner ring (8), and the minimum inner diameter of the pressing groove (6) is smaller than the minimum outer diameter of the inner ring (8). The inner ring (8) is provided with a plurality of threaded holes on its side, and the outer ring (5) is provided with a plurality of through holes on its side. The threaded holes correspond to the through holes, and the tightening bolt (7) passes through the through holes and is connected to the threaded holes by threads. By rotating the tightening bolt (7), the inner ring (8) moves into the clamping groove (6). Through the compression effect of the conical structure of the clamping groove (6), the inner ring (8) contracts inward, and then the entire circumference of the outer ring of the main shaft is uniformly compressed. After the outer ring of the main shaft separates from the inner ring of the bearing, the outer ring of the main shaft is moved axially inside the bearing. Then the tightening bolt (7) is rotated in the opposite direction to loosen the entire tightening device. In step S4, when the outer ring of the main shaft is moved out of the bearing, it is moved in several steps. After moving to a certain distance, the tightening device is then put on the outer ring of the main shaft, and the tightening bolt (7) is rotated to make the inner ring (8) move into the pressing groove (6) and shrink. Then, the entire circumference of the outer ring of the main shaft near the bearing is uniformly compressed again.

2. A method of disassembly of a main shaft bearing of a wind turbine generator as claimed in claim 1, characterized in that: In step S4, before installing the tightening device, the outer surface of the spindle outer ring on one side of the bearing is machined to reduce the outer diameter, and the bearing moves towards the spindle end with the smaller outer diameter.

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