After calculating and checking strength of the break shaft,it analyses the break causes of shaft when the calculative coefficient is less than the allowable safety one,introduces preventive measures.

• 简述了水泥厂烧成系统改造后回转窑主减速机的使用状况,对断后输入轴进行了强度校核,并分析了计算系数小于许用安全系数情况下轴断裂的原因,介绍了处理措施。