Structural Reliability Optimization Design Of Mechanical Excavator For Mining

China's industrial development depends on the continuous supply of mineral resources.In recent years,with the continuous progress of China's industrial level,the demand of mineral resources from all walks of life is becoming more and more urgent.As China's industrial development is relatively late,the development technology of mineral resources lags behind that of the United States,Germany and other industrial developed countries,especially in the technology of large mining construction machinery,which has been subject to the technology monopoly of foreign countries for a long time.In order to improve the production capacity of domestic independent brands and break through technical difficulties,China proposes "made in China 2025",aiming at developing China's manufacturing industry and enhancing the international influence of made in China.In this paper,the large mining excavator used in mineral resources development is studied,mainly taking the working device as the research object.Firstly,the kinematics analysis of mining excavator working device is carried out.The excavating track graph of bucket is obtained by derivation of excavating track.The mathematical model is established,the equation of motion between the key parts is established,and the motion characteristic curve of the key parts is drawn by computer.Finite Element Analysis of mining excavator working device is carried out.The mechanical analysis model of the working device is obtained by the force analysis of the working device.On the basis of kinematics and mechanics analysis,the force balance equation is established.Find out the dangerous working conditions of the mining excavator in the dangerous working conditions and solve the stress situation of the mining excavator in the dangerous working conditions.With the help of finite element analysis technology,get the stress and deformation results of the boom in the dangerous working conditions.The structure optimization of moving arm of mining excavator is carried out.The parametric modeling of the boom is carried out.By setting the range of design variables and optimization algorithm,the optimal solution of the boom is found and the optimal structure of the boom is obtained.The reliability analysis of mining excavator arm is carried out.The design variables are sampled by Monte Carlo method,and the experimental design samples are obtained.Based on the agent model,the experimental design samples are fitted,and then the reliability of the arm is obtained by Monte Carlo method,and the reliability of the arm under the direct Monte Carlo method is obtained by statistic the experimental design samples.The reliability optimization design of the boom is carried out.Taking the mass of the arm as the objective function,the design variables of the arm and the expected reliability of the arm as the constraints,the optimal structure of the arm under the expected reliability is obtained by combining the genetic algorithm and the non-linear programming function.