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为提高液压挖掘机的安全性,研制了液压挖掘机驾驶室滚翻保护结构(ROPS)。针对硅油减振器承载能力弱的缺点,设计了防止ROPS同回转平台分离的安全拉杆装置。在给出ROPS弹塑性大变形数值计算方程的基础上,应用弹塑性大变形有限元方法对ROPS进行了侧向承载能力仿真分析和试验验证。对比仿真分析、试验结果可知,在满足最小能量吸收要求情况下,ROPS发生了塑性变形,最大变形为321 mm,未侵入DLV,满足标准要求。仿真分析结果同试验测试结果相接近,最大误差7.8%,研究结果对ROPS结构设计具有一定参考价值。
In order to improve the safety of hydraulic excavators, the ROPS of the hydraulic excavator cab has been developed. In view of the weak bearing capacity of the silicone shock absorber, a safety lever device is designed to prevent the ROPS from separating from the rotating platform. Based on the numerical calculation equations of large elastic deformation of ROPS, the lateral bearing capacity of ROPS was simulated and validated by using the elasto-plastic large deformation finite element method. Compared with the simulation analysis, the test results show that under the condition of meeting the minimum energy absorption requirements, ROPS plastic deformation occurs, the maximum deformation of 321 mm, did not invade DLV, to meet the standard requirements. The results of simulation analysis are close to those of the test and the maximum error is 7.8%. The research results have certain reference value for the structural design of ROPS.