CWGD250型擦窗机吊臂的优化设计与结构分析

Optimal Design and Analysis of the Jib Structure on CWGD250 Window Cleaning Equipment

目的分析CWGD250型擦窗机吊臂结构自重及稳定性,提出拉索式吊臂结构解决臂架过重以及臂身稳定性不够的问题.方法运用现代三维设计软件对比分析了擦窗机传统吊臂与拉索式吊臂的两种结构模型,并将模型导入到有限元计算软件中.选取擦窗机特定工况,考虑动载系数及风载荷对擦窗机的影响,计算分析拉索式吊臂结构和传统结构的静力学性能.结果在考虑动载系数及风载荷工况下,计算结果中拉索式吊臂的最大挠度为61.59 mm,传统结构的最大挠度为177.11 mm,两种形式的最大挠度均出现在前端与旋转吊臂相连接的位置.拉索式吊臂的最大应力为273.08 M Pa,出现在前部拉索的中间段;而传统结构的最大应力为303.41 M Pa,集中作用在吊臂的回转支撑连接处;对比得到传统吊臂的自重310 kg是拉索式吊臂280 kg的1.1倍.结论擦窗机拉索式吊臂结构在提升臂架强度及稳定性的情况下,降低了整机的自重,经验证拉索式结构在擦窗机吊臂应用中具备可行性,为优化擦窗机的设计提供了参考.

This paper proposed a cable-type jib structure to solve the overweight and unstable problems on CWGD250 windowcleaning equipment. The three-dimensional structure models of traditional-type jib and cable-type jib were comparatively analyzed,and imported into finite element software. The static mechanical properties of two jib structures were calculated considering the influence of dynamic load factors and wind loads under certain working condition. The results showed that the maximum deflection,which appeared at the front of the jib,was 61. 59 mm for the cable-type structure,and 177. 11 mm for the traditional structure. The maximum stress of cabletype jib was 273. 08 M Pa,appeared in the middle section of front cable wire,and the value was303. 41 M Pa for traditional structure,which concentrated in jib slewing connections. Therefore,thecalculation results showed that traditional jib was 1. 1 times the weight of the cable-type jib. The cable-type jib structure could improve the strength and stability with lower weight and provides a reference for the optimal design of windowcleaning equipment.