Analysis of the Breakage of Bolts for Wind Turbine Blades
The breakage of blade bolts in wind turbine units is a difficult problem in the daily operation maintenance.From the aspects of the design quality and installation of the blade bolts,the problem is analyzed in-depth.With theoret-ical analysis and experimental study,as well as comparison between the broken bolts and the normal bolts,it is deter-mined that the direct and main cause of the bolt breakage is insufficient pre-tightening force,which leads to relative dis-placement and collision and wear of the bolts and the connectors during operation.The surface damage of the screws be-comes cracking sources and causes fatigue breakage.Also,other important factors include the impact of unqualified lu-bricant application during installation on the pre-tightening force,the impact of external damage of bolts during transpor-tation on the pre-tightening force,excessive maintenance interval or improper maintenance torque,and uncertain factors such as long-term vibration,unstable wind conditions,and extreme environments of the wind turbines.Corresponding suggestions are then proposed.
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