Wind turbine generator variable-pitch bearing bolt tightening method

Abstract

The invention discloses a wind turbine generator variable-pitch bearing bolt tightening method. The method includes the steps that (1) eight bolts at the 0-degree position, 45-degree position, 90-degree position, 135-degree position, 180-degree position, 225-degree position, 270-degree position and 315-degree position of a variable-pitch bearing are subject to first-time tightening according to the crossing method sequence; (2) the eight bolts on the variable-pitch bearing are averagely divided into eight zones through eight bolts; (3) the bolts in the eight zones are subject to regionalization first-time tightening according to the crossing method sequence; and (4) after first-time tightening of all bolts on the variable-pitch bearing is completed, second-time tightening of all the bolts is completed according to the sequence in the step (1) and the step (3), and finally final tightening of all bolts is completed according to the sequence in the step (1) and the step (3). According to the wind turbine generator variable-pitch bearing bolt tightening method, the regionalization tightening measure is taken, while the bolt tightening quality is guaranteed, the process is optimized, the labor intensity of workers is reduced, and potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to the technical field of wind turbine assembly, in particular to a method for tightening pitch bearing bolts of a wind turbine. Background technique [0002] During the installation and daily maintenance of the wind turbine, the pitch bearing is connected to the hub through a plurality of high-strength bolts distributed in a ring. In order to ensure that the pre-tightening force of the annularly distributed bolts on the entire flange surface is equal, the method of tightening the bolts is very important. The national standard "GB / T19568-2004 Specification for Assembly and Installation of Wind Turbine Generating Sets" stipulates: figure 1 The sequence in the cross, symmetrical, step by step, even tightening. [0003] With the development of wind turbine technology, the power generation of a single wind turbine increases and the technology of low-speed wind turbines advances, the diameters of hubs and pitch bearings are also incr...

AI Technical Summary

Problems solved by technology

Front-line employees need to constantly climb up and down the ladder when tightening bolts, which is labor-intensive, inefficient, and poses safety hazards

[0004] This shows that the above-mentioned existing wind turbine pitch bearing bolt tightening method obviously still has inconvenience and defects, and needs to be further improved urgently

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