超大吨位预应力机架连接螺纹卸载结构的研究

Research on unloading structure of connecting thread for super-large tonnage pre-stressed frame

由于大型设备(如液压机、拉伸机等)所使用的超大吨位预应力机架的连接螺纹受力非常大,是整个设备的薄弱环节。本文采用有限元方法模拟了某125 MN拉伸设备的螺纹受力状况,并提出四种卸载结构降低螺纹的应力,通过有限元分析软件Ansys对4种方案进行了模拟计算,结果表明:“腰状杆螺栓+螺栓倒斜角+环槽内斜角螺母”的卸载结构能大幅降低螺纹的牙根应力,是最优的卸载结构,该研究为同类设备提供重要参考。

Due to the connecting thread of the super large tonnage pre-stressed frame used in large equipment(such as hydraulic press and stretching machine,etc.)is very large stressed,it is the weak link of the whole equipment.The stress state of a 125 MN stretching machine is simulated by finite element method in this paper,and four unloading structures are put forward to reduce the stress of thread,then the schemes are simulated and calculated based on the finite element analysis software Ansys.The results show that the unloading structure of“waist rod bolt+bolt obliquity angle+ring groove inner obliquity nut”is the best unloading structure,it can greatly reduce the thread root stress.The research provides an important reference for similar equipment.