Method for repairing and recycling abrasion part of main shaft of wind turbine generator

Abstract

The invention discloses a method for repairing and recycling an abrasion part of a main shaft of a wind turbine generator. The method comprises the following steps that surface flaw detection is carried out on the abrasion part of the main shaft to determine the range of the abrasion part; Turning is carried out on the main shaft on a machine tool, turning is carried out from the abrasion part to an R angle part on a hub side, the surface, corresponding to a shaft sleeve, of the main shaft is included, the diameter of the main shaft is reduced by 1-4mm, and the R angle, the shaft diameter tolerance and the roughness after turning are kept unchanged, namely the R angle, the shaft diameter tolerance and the roughness are consistent with those of the original main shaft, surface flaw detection and hardness detection are carried out on the turning surface of the main shaft to confirm that an abrasion layer is completely removed; a non-standard bearing with the inner diameter reduced by 1-4 mm is designed, only the inner diameter of an inner ring of the bearing is increased, and other parameters are kept consistent with those of an original bearing; and the non-standard bearing and the turned main shaft are installed in a matched mode and then reused. According to the method, on the premise that the bearing capacity of the main shaft is hardly influenced by slightly changing the diameter size of the main shaft, the effective interference fit between the shaft neck of the main shaft and the bearing can be ensured.

Description

technical field [0001] The invention relates to the technical field of repairing metal parts, in particular to a method for repairing and recycling worn parts of a main shaft of a wind turbine. Background technique [0002] The main shaft is a key component for transmitting loads in wind turbines. It is supported by two bearings and bearing housings and fixed on the tower. Due to the complex force on the spindle during operation, there is often a certain relative movement between the spindle and the spindle bearing mating surface, resulting in wear and peeling of the spindle surface, resulting in the spindle being scrapped and replaced. [0003] Since the main shaft is a large forging, the general diameter is between Φ500-600mm, and the production cost is high. In order to reduce the maintenance cost and reduce the waste of resources, laser cladding technology is currently used to remove wear defects and repair the size of the main shaft for reuse. This technology has the a...

AI Technical Summary

Problems solved by technology

[0005] With the increase in the number of reusable main shafts repaired by laser cladding, there have been many accidents in recent years that the main shaft of the fan has broken and the hub and blades have fallen to the ground due to the high hardness and brittleness of the cladding layer.

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