机械式挖掘机三角架的优化改进设计

Optimized Design of Mechanical Excavator trivet

挖掘机的三角架结构是挖掘机的重要组成部分,由于其结构非常大,且受力非常复杂,工作环境也很特殊,在工作过程中往往会出现一些问题,如刚度偏小,顶部主要铸件处合位移偏大,以及平台与三角架连接部分容易出现应力集中现象等。如果平台及三角架设计不合理,必将会带来非常严重的后果。本文针对这些问题,在对三角架原设计方案进行优化设计的基础上,提出了一种新型的结构形式,即将三角架改为双压杆支架,并进行其受力分析,通过对这2种结构的受力分析与比较,最终改进后可以得到比较理想的结构,从而解决三角架结构在实际挖掘工作中出现的问题。

Because of the structure of the excavator trivet is very big, the stress is complex, and the working conditions are also very special, the rigidity is often small in the working process, simultaneously, the platform and trivet connect are easy to present the phenomena of stress concentrations. If the platform and trivet＇s design are unreasonable, it will bring very serious consequence. The paper focused on this question and carried on the optimized design of the trivet. After the improvement, the quite ideal structure can be obtained.