Deep Hole Broken Wire Reverse Twisting Method for Wind Turbine Units
Bolts are important components of wind turbines,responsible for the interconnection of various main compo-nents.The hub of the wind turbine described in this paper is connected and fastened to the main shaft flange through bolts. Under long-term alternating wind loads,bolts are prone to loosening,which can affect the fatigue life of the structure. Once cracks form,it may cause the instability and collapse of turbine tower.Therefore the bolts that cause the hub to break must be removed and replaced with normal bolts to ensure safe operation.The specific and effective method for re-moving broken bolts from wind turbines is to first drill a positioning hole in the middle of the broken wire,expand the hole,then use a reverse screw to reverse tighten and remove the broken bolt.The proposed method overcomes unfavorable factors such as deep location of broken bolts,narrow construction space,and large difficulty,facilitates more convenient and efficient removal of broken bolts from wind turbines,and has high economic and social benefits.