A method for deflection correction of wind turbine blades

Abstract

The invention discloses a method for correcting the blade deviation of a wind power generating set, which solves the problems of high cost, poor safety and long time for deviation correction in the prior art. The invention can save economic cost, labor cost, save Maintenance time, wind farm operation and maintenance are highly operable, which can effectively avoid unit accidents. The technical solution is: adjust the blades to make them in a smooth state; stop the wind turbine, operate the high-speed shaft brake disc to make the blades to be corrected vertically downward; use the wind wheel lock plate to lock the wind wheel, and unload the blades to be corrected The pre-tightening force of the studs connected with the pitch bearing circumference; divide the circumference into four areas, remove the set number of nuts in each area, and tighten the remaining nuts; operate the pitch manual operation box to make the blade change repeatedly Feather the propeller until the center of the stud coincides with the center of the connecting hole of the pitch bearing.

Description

technical field [0001] The invention relates to the field of wind power applications, in particular to a method for correcting the blade deflection of a wind power generating set. Background technique [0002] With the rapid development of wind power technology and the increase of installed capacity year by year, there are more and more problems in the connection between blades and pitch bearings, seriously affecting the safe operation of wind turbines, and gradually attracting great attention from various complete machine manufacturers. Blades and pitch bearings are the key components of wind turbines, and the components are connected by high-strength studs. Therefore, the loading of high-strength studs plays a vital role in the safe and reliable operation of the unit. When the blade is assembled with the pitch bearing, due to the large connection diameter and the large number of mounting holes, and the use of a crane to align the blade to the pitch bearing, many factors ma...

AI Technical Summary

Problems solved by technology

When the blade is assembled with the pitch bearing, due to the large connection diameter and the large number of mounting holes, and the use of a crane to align the blade to the pitch bearing, many factors may cause the center alignment of the connection holes between the blade and the pitch bearing. The connecting studs are stuck on the wall of the pitch bearing hole, causing the bolts to be sheared, which affects the reliability of the connection and the safety of the unit

[0003] The connecting studs between blades and pitch bearings are thin rods in the middle, and the installation pre-tightening force is smaller than that of normal studs. If the inspection is not timely, the pre-tightening force of the studs will become smaller, causing the blades to deviate from the pitch bearing, and the studs will be stuck on the wall of the pitch bearing hole. It will fall, and the wind wheel will be unbalanced, which will cause serious accidents such as the unit falling down

[0004] Due to the particularity of the connection position between the blade and the pitch bearing, to correct the blade so that the connecting holes of the two connecting parts are centered, a crane must be used to drag the blade to correct the deviation. more difficult to implement

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