塔机作为建筑工地上的主要机械,在施工中起着关键作用。塔机的三大传动机构,特别是起升机构工作性能的优劣,是衡量塔机技术先进程度的重要标志。起升机构的主要功能是起吊重物,在频繁的起吊、卸载和变速过程中,起升机构传动系统的各个环节的零部件都处在一个较大的交变应力状态 Tower crane as a major construction machinery site, plays a key role in the construction. The tower crane three transmission mechanism, especially the performance of the merits of the lifting mechanism, is an important symbol of tower crane technology advanced degree. The main function of the hoisting mechanism is to lift the heavy objects. During the frequent lifting, unloading and speed changing, the components of the hoisting mechanism transmission system are all in a state of large alternating stress