论文部分内容阅读
计算箱形伸缩臂的刚度和内力时,常假设整个臂架为一外伸连续粱。由于没有考虑臂架重叠搭接,伸缩机构布置对臂架强度、刚度计算的有利影响,因此,计算的臂架挠曲线和危险截面的弯矩与实际不符,且偏大。本文把箱形伸缩臂的计算模式视为一分段连续粱——彼此能相互滑动的套筒结构。在此基础上阐述了臂架变形和内力的新计算方法,并编制了起重特性曲线的计算程序。通过对QY8A汽车起重机计算验证,表明新的计算方法能提高现有起重机的起重能力。
When calculating the stiffness and internal forces of box-type telescopic arms, it is often assumed that the entire boom is an outward continuous beam. The bending moments of the bending line and the dangerous section of the boom are not in conformity with the actual ones because they are not considered to have beneficial effects on the strength and stiffness calculation of the boom. In this paper, the computational mode of the box telescopic boom is considered as a continuous sleeve beam-sleeve structure that can slide with each other. Based on this, a new calculation method of boom deformation and internal force is elaborated, and the calculation program of lifting characteristic curve is compiled. Through the verification of the QY8A truck crane, it shows that the new calculation method can improve the lifting capacity of the existing crane.