摘要本文阐述了液压挖掘机发展的背景和研究现状以及动臂结构设计的研究意 义，根据挖掘机的参数性能要求对动臂进行结构设计。

首先介绍了液压挖掘机工作装置的总体组成，分析了动臂结构在整机中的重 要性，然后经过对组合式动臂与整体式动臂优缺点的比较，确定此次设计动臂采 用整体式弯动臂。根据经验公式求出动臂长度、斗杆长度、上动臂与下动臂的长 度以及动臂弯角大小，确定动臂液压缸与车座的铰接点以及动臂液压缸与动臂的 铰接点的位置，确定端部叉式轴承座、中部轴承座总成以及动臂下轴承支座的各 项参数，使动臂丰满成一个实体结构,进行 CAD 图形的绘制。73835

其次为了方便对已设计好的动臂结构进行有限元分析，根据 CAD 装配图在 Pro/E 中创建动臂结构的三维模型。完成前期创建实体模型的准备工作后开始进 入有限元分析阶段，在 ANSYS 中导入动臂结构的模型，进行网格划分，选择第 一工况位置的受力对动臂的有限元模型进行加载求解，将最大切向挖掘力作为施 加载荷，在动臂与车座的铰接孔以及动臂液压缸与动臂的铰接孔处施加固定约 束，最终得到动臂结构有限元模型的受力变形结果以及应力结果。

最后查看有限元分析结果，发现最大位移变形处在动臂与斗杆的铰接处，最 大应力远远小于材料的屈服极限，符合设计要求。

该论文有图 31 幅，表 3 个，参考文献 29 篇。

毕业论文关键词：液压挖掘机 动臂 结构设计 有限元分析

Structure Design of Hydraulic Excavator's Boom And Finite Element Analysis

Abstract This paper describes the background and present research situation of the development of hydraulic excavator and the significance of the research of arm structure design, according to the parameters of the excavator performance requirements to design the boom structure.

First introduced the hydraulic excavator working device of the overall composition and the analysis of the the importance of boom structure, and then through comparing the combined arm and the integral type movable arm advantages and disadvantages to determine which the design will adopt, the result is the integral type bending boom. According to the empirical formula for dispatched arm length, bucket rod length, boom boom length and the boom angle size, so that transfer the boom into a solid structure and complete the CAD graphics rendering.

Secondly, in order to facilitate the design of boom structure finite element analysis, drawing in Pro / E to create boom structure of 3D model then began to FEM in ANSYS, grid pision, select the first working position’s maximum shear force as the applied load, the boom and the seat hinge hole and a movable arm hydraulic cylinder and the movable arm is hinged hole fixed constraints, finally get the boom structure finite element model of the force deformation results and force results.

Finally, the finite element analysis results show that the maximum displacement deformation is in the hinge of the boom and the bucket, the maximum stress is far less than the yield limit of the material, in accordance with the design requirements.

There are 31 figures, 3 tables and 29 references in this paper.

Key Words: Excavator Jib Structure design Finite element analysis

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摘 要 3

Abstract 4

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