Modern Design And Dynamic Load Analysis In Special Condition Of Hydraulic Excavator Working Device

Hydraulic excavator is the main equipment of Engineering machinery. Accordingto statistics, about60%of the workload of earthwork construction is accomplished byexcavator, so the study of excavator design is of very important significance.At present, the excavator product development has been widely used CADtechnology and three-dimensional modeling techniques in China, the widespread useof AutoCAD software, PRO/E software and finite element analysis software has alsobeen applied. But the static strength design method is still the main method in strengthcalculation and the design work condition is mainly based on conventional diggingcondition. Besides that，three-dimensional modeling and finite element modelingapproach are largely artificial, all of that make low design efficiency.A type of excavator is used as a prototype on research in this paper. Theexcavator dynamic load-mainly generated due to collision in the rotary process and itseffect to the excavator’s strength has been analyzed, and according to the needs ofmodeling, automatic modeling technique is been studied and applied to the parts andthe whole modeling of excavator working device.This topic focus on the rapid modeling (parameterization and automation) of thehydraulic excavator working device and the dynamic load analysis with some specialconditions. The purpose of this topic is to research the modern design methods overhydraulic excavator working device including choosing proper CAD/CAE design toolsoftware and programming proper and efficient design procedure.All the works mainly done in this paper are as follows:(1) Make secondary development over PRO/E based on Automation Gatewayplug-in and VB programming environment. It has been successful to develop theparameterized modeling applications including the modeling of main parts ofhydraulic excavator working device, for instance, the boom, stick, bucket, rocker andlink. And then the automatic assembling application is developed as well. Via theautomatic assembling application, the pars of hydraulic excavator working devicemodeled by the parameterized modeling application can be assembled to an entirety. (2) Using ADAMS software to simulate the rotation and collision work-conditionover the hydraulic excavator working device and got the load value of this process,this load value can be used to the load intensity calculation or conventional intensitycalculation.(3) Using the finite element analysis software ANSYS (Workbench Environment)to analyze the working device in accordance with the rotation and collision workcondition, including the analysis of static calculation and transient dynamicscalculation and then get the structure maximum stress values in this work condition.(4) All the above results show that: in the excavator rotation and collisionwork-condition, the maximum stress values may occur in the hinge point ofexcavator’s boom and arm, hydraulic cylinder of bucket hydraulic package, the hingepoint of boom and the turntable, etc. Identifying these key parts can be references inthe working device structure optimization process.