关键词：50吨汽车起重机、主臂设计、三铰点、伸缩方式、三维建模 [gap=722]Keywords: 50-ton truck crane，the boom design，the three hinge points ，stretching，three-dimensional modeling ..
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简要介绍空气悬架导向臂的设计改进过程，并对改进前后的导向臂和主销后倾角进行简要分析。
This text introduces the process of design improvement of the air suspension guide arm, and analyzes the guide arm and kingpin caster Angle before and after the improvement.
本文以臂摇钻床为例，说明了通用机床主传动系统优化的设计方法。
This paper accounts for the method of the optimum design of the main gearing system for universal machine tools, taking the radial drill for example.
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