基于拉格朗日理论,运用动力学分析软件ADAMS模拟旋挖钻机变幅机构起桅及非正常落桅工况,研究变幅机构各铰点、液压缸在不同工况下的受力状况以及不同加速时间下的冲击载荷。结果表明:旋挖钻机桅杆接近水平姿态时变幅机构受力最大,且启动时的加速度及带钻杆落桅对受力大小有较大影响。 Based on the Lagrangian theory, the dynamic analysis software ADAMS is used to simulate the mast and abnormal mast operating conditions of the luffing mechanism of the rotary drilling rig, and the stress conditions of the articulated joints and the hydraulic cylinder under different operating conditions Impact load at different acceleration times. The results show that the luffing mechanism exerts the most force when the mast of rotary drilling rig approaches the horizontal attitude, and the acceleration at start-up and the influence of the stress of the drill pipe with mast on the mast have a greater impact.