钳夹车并联起升机构分析与电液称重实验研究

Analyses of Schnabel Car's Parallel Lifting Mechanism and Experimental Research on Electro-hydraulic Weighing

为解决长大货物铁路运输钳夹车自身精确称重问题,基于空间闭环机构自由度计算公式,对钳夹车并联起升机构进行了机构自由度分析,基于坐标变换法对钳夹车并联起升机构进行了运动学分析,建立了货物起升位置与压柱油缸输入映射模型,得到了起升机构速度传递雅可比矩阵,结合系统静力平衡方程,建立了压柱油缸起升力与货物质量间力映射模型。分别针对钳形梁结构变形和压柱油缸摩擦对并联起升机构称重精度的影响进行了分析计算,在此基础上,设计并研制了钳夹车并联起升机构样机及其电液称重实验系统,开展了基于摩擦补偿的钳夹车电液称重实验研究,提高了钳夹车电液称重精度。

In order to solve the precise weighing problem of long-heavy cargo railway transporta- tion schnabel car,the freedom of the parallel lifting mechanism was analyzed based on spatial closed loop. The coordinate transformation method of kinematic analysis was performed on schnabel car lift- ing mechanism,and the mapping model between lifting track of cargo and protrudent length of cylin- der was established,the promotion mechanism of Jacobian transfer matrix system was obtained. Com- bined with the static equilibrium equation,the mapping model between output pressure of cylinder and mass of cargo was established. The influences of structural deformation and cylinder friction on the parallel lifting mechanism weighing precision were analyzed and calculated; then the prototype of the sehnabel car parallel lifting mechanism and its electro-hydraulic weighing test system were designed and developed. The experimental study on electro-hydraulic weighing was carried out based on friction compensation of schnabel car,and the weighting precision of sehnahle ear is imnrnv^cl