二级剪叉式丝杠升降机构受力分析

摘要

设计了二级剪叉式丝杠升降机,完成了三维造型和运动仿真模拟,并对二级剪叉式丝杠升降机构进行了动力学分析,利用虚位移原理推导升降机台面载荷和丝杠推力之间的关系公式;通过对整机和单个剪叉杆的受力分析,建立了二级剪叉式丝杠升降机构的力学模型.以一台大型升降机为例,分析剪叉杆的受力情况,利用MATLAB软件计算剪叉杆的受力大小,并对剪叉杆的强度进行校核.经现场实际测试验证,该二级剪叉式丝杠升降机结构稳定.为剪叉式丝杠升降机的设计分析提供了理论.%The secondary scissoring screw lifter was designed,its 3D model and motion emulation and dynamic analysis were completed in it.Using virtual displacement principle,the relationship formula between the lifter's table load and screw thrust were derivea.Moreover,mechanical model of the lifting mechanism was established by analyzing stress analysis of the whole lifter and single scissor lever.For example,in a large scissoring screw lifter,the scissor lever's stress under Matlab was calculated after analyzing its stress conditions,and then the scissor lever's strength was checked.Actual field-testing results show that the structure of the scissoring screw lifter is stable,and theoretical fundament is provided for the further design and analysis of the scissoring screw lifter.