偏载作用下侧卸式装载机铲斗臂的有限元分析  

Finite element analysis of bucket arm of side discharge bucket loader under offset load

作　　者：李晓豁[1] 王新[1] 孟冉[1] 石峥嵘[1] 

机构地区：[1]辽宁工程技术大学机械工程学院,辽宁阜新123000

出　　处：《广西大学学报（自然科学版）》2013年第2期263-269,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(59774033);中国煤炭工业协会科学技术研究指导性计划项目(MTKJ2011-325);辽宁省大型工矿装备重点实验室(辽宁省第二批科学技术计划项目;2008403010)

摘　　要：为了研究受偏载作用时侧卸式装载机铲斗臂在不利工况下的变形、强度和应力分布,寻找结构上的薄弱环节,利用Pro/E软件建立了工作机构和铲斗臂的三维实体模型,通过对工作机构的运动分析、受力分析,求得铲斗臂在插入和铲装工况下受偏载作用时的载荷,利用ANSYS得出铲斗臂在这两种工况下受偏载作用时的位移和应力分布云图。研究表明:在这两种工况下,铲斗臂销孔B处的变形都很大(插入时最大达4.9mm),铲斗臂销孔D处的应力集中明显,且铲装时最大应力值为314 MPa,安全系数只有1.098 7,不满足强度要求。分析确定B、D处为铲斗臂的薄弱环节,依此对铲斗臂进行结构改进,并对改进后的铲斗臂进行有限元分析。研究表明:改进后铲斗臂的刚度提高49%,强度提高15%,安全系数提高18%。To study deformation, strength and stress distribution of a bucket arm of a side discharge loader by offset load under adverse conditions, and to look for structural weak links, three-dimen- sional solid models of a working mechanism and a bucket arm were established by means of Pro/E software. By analyzing the motion and impact of working mechanism, the offset loads of the bucket arm were obtained under inserting and loading conditions. Distributions of displacement and stresses of the bucket arm were obtained in this two kinds of offset loading condition by means of ANSYS. The results show that larger defo,~nation located in the pin-hole B （up to 4.9 mm when inserting）, stress concentration in pin-hole D is obvious, the maximum stress value is 314 MPa under shoveling and loading and the safety factor is only 1. 098 7, which can not satisfy the strength requirement. For improving deformation and stress distribution of pin-hole B and D of the bucket arm, structure of bucket arm, was redesigned and re-analyszed. The results show that stiffness of the improved bucket arm can be increased by 49% , strength by 15% , and safety coefficient by 18%.

关 键 词：侧卸式装载机 铲斗臂 强度 有限元 应力分布 

分 类 号：TD421.71[矿业工程—矿山机电]