矿用10m^3挖掘机斗杆的有限元分析  

Finite Element Analysis for Dipper Stick of 10 Cubic Meter Mining Excavator

作　　者：郑德超[1] 魏心宽[2] 

机构地区：[1]内蒙古科技大学机械工程学院,包头市014010 [2]包钢集团公司白云鄂博铁矿

出　　处：《工程机械》2008年第8期20-23,共4页Construction Machinery and Equipment

摘　　要：针对矿用10m3挖掘机斗杆在使用中经常发生断裂失效的现象,为探究斗杆产生裂纹和扩展变化的机理,借助于Pro/E三维建模技术,构建了符合实际的斗杆力学模型,利用有限元分析方法,就挖掘过程中载荷偏置情况的几种典型位置,从双侧斗杆承受的弯曲、拉压、扭曲、剪切作用及结构刚度与布局等方面,对危险区域应力分布规律进行了详细的比较与分析,明确了高应力区主要集中在斗杆下盖板变断面与外腹板结合处以及连接横梁与内侧腹板后部结合处。据此提出优化斗杆结构的措施,采取变断面处补加一肋板进行试算,与原设计斗杆进行比较,结果表明可使该部位等效应力降低10%左右,有利于提高斗杆的强度。In view of frequent fracture failures of the dipper stick of 10 cubic meter mining excavator in operation, a mechanical model, complying with practical situation, of the dipper stick is set up in order to study its fracture forming and extending mechanism with the aid of Pro/E 3D modeling technology. Applying finite element analysis, stress distribution regularities in dangerous areas are compared and analyzed in details from the aspects of loading action such as bending, pulling/pressing, twisting and shearing, as well as structure rigidity and layout. It is determined that high stress areas are mainly concentrated at the connection between variable section of lower cover plate and outside web of the dipper stick and the connection between cross beam and rear part of inside web. On the basis of that, measures to optimize the dipper stick structure are suggested. Adding a brace plate at the variable section area, its test calculation is compared with original dipper stick design. The results show that equivalent stress at the area is reduced about 10%, which benefits the dipper stick strength increase.

关 键 词：挖掘机 斗杆 有限元 裂纹 PRO/E 优化 

分 类 号：TU621[建筑科学—建筑技术科学] P315.9[天文地球—地震学]