Based On The Structural Optimization Of A Certain Type Of Eight Ton Hydraulic Excavator

Excavator plays an important role in reducing labor intensity and improving engineering efficiency,so it is widely used in many engineering fields.At present,it is vigorously underway to realize energy conservation and emission reduction,environmental protection and safety infrastructure construction in China.In view of previous problems are that traditional product structure design theory is conservative,it is an inevitable trend to carry out lightweight design research on excavators.The working device is the main executor of excavator excavation,and its performance requirements determine the efficiency of the whole excavator.Therefore,based on the requirements of working strength and stiffness,it is a feasible way to reduce the manufacturing cost and improve the working performance for proceeding the structural optimization design of the working device.In this paper,the light weight design of a small 8-ton hydraulic excavator is studied,and the following research contents are completed:(1)Kinematic analysis of the working device.Firstly,the virtual prototype model and the mathematical model of the working device are established,and then some parameter data are obtained by dynamic simulation and numerical calculation respectively.Finally,the parameter data of simulation calculation is compared with the actual data.The accuracy of the virtual prototype model and the mathematical model is verified by comparing the results.(2)Dynamic analysis of working device.Firstly,based on the main mining mode of the working device,two mining processes of bucket mining and stick mining are designed,and then the mining resistance under the two mining modes is calculated by the empirical formula.Finally,the stress variation in the two mining processes is analyzed by the way of rigid flexible coupling simulation.Compared with the simulation results,it is found that the bucket excavation method will produce greater stress.(3)Finite element analysis of working device.Firstly,the finite element model of the working device is established by the way of parametric modeling,and then the digging forces of the working device under five typical working conditions are calculated by force analysis.Finally,the stress cloud diagram of the whole working device and each component under seven working conditions is obtained by static analysis of the working device under seven working conditions.Through the analysis and comparison of cloud image information,it is found that the most dangerous working condition is the partial load condition under the four position working condition,and the working device has the feasibility of optimization.(4)Lightweight design of the working device.Some plate thickness parameters of each component in the working device are selected as the design variables,and the allowable stress of the material is taken as the constraint condition.Based on the Guide-Weight method and the Gradient method,the light weight design of the working device under the most dangerous condition is carried out.After six iterations and after rounding treatment,the overall weight of the working device has achieved a weight reduction rate of 9.1%.