Transforming mechanism of component load direction is designed after analyzing component loads error ' s sources . the analysis and calculation of concomitant error from transforming mechanism have also been done to make sure that weighting system can satisfy requirement for precision 在分析加载误差来源后,设计了载荷方向转换机构,并对转换机构带来的误差进行了计算和分析,证明加载系统能够很好地满足精度需要和技术要求。