Requirements for the use of high-strength bolts in wind turbines

   As one of the most widely used connection methods in wind power equipment, high-strength bolt link has the advantages of simple construction, replaceable, good stress and fatigue resistance. The construction method of domestic high-strength bolt link generally adopts the torque method, and most of the mainstream wind turbines in the current process are imported from foreign technology, so the tightening torque and tightening method are basically in accordance with the foreign design requirements. However, in the construction process, we found that most of the failure of bolts was due to the plastic rheology of the teeth squeezed by excessive external force, which could be determined to be caused by excessive tightening torque.
   Through the torque coefficient test, it is found that the torque coefficient of the domestically produced bolt is quite different from that of the foreign design when the thread anti-bite agent required by the foreign design is used. After communication, the reason should be that the surface quality of threads at home and abroad is different, so the tightening torque of high-strength bolt connections needs to be recalculated and the correct construction method needs to be recalculated.
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