本文分析表明,20万千瓦汽轮机高、中压转子联轴器螺栓断裂的原因之一,可能与安装预紧力给得不当有关。因此对螺栓安装预紧力作了理论分析和计算,同时给出了安装预紧力的限制方法和保证措施。 The analysis of this paper shows that one of the reasons why the bolts of high and medium pressure rotor coupling bolts are broken in a 200MW turbine may be related to improper installation of pre-tightening force. Therefore, the theoretical analysis and calculation of bolt preloading is made. At the same time, the methods and measures to ensure the preload of the bolt are given.