Finite Element Analysis And Optimization Design Of Coal Sampler Working Device

With the development of society,mechanized sampling method has replaced the artificial sampling method to achieve a more rapid and efficient sampling.Five degrees of freedom joint coal sampling vehicles has a good obstacle avoidance,strong adaptability and multi-pose advantages in the work space,and has a good application prospects in the field of coal sampling.In the past,when the strength analysis of the working device of the coal sampler was carried out,the error caused by the boundary condition and the uncertainty of the load was generated due to the separate calculation of the structural parts,resulting in the calculation result being inaccurate.Due to the prevalence of engineering machinery,such as strength,stiffness surplus and excessive weight,there is no maximum utilization of material properties.Therefore,the structural strength of the working device of coal sampler and the cross section of the manipulator directly affect the reliability and economy of the whole machine.Accordingly,based on the actual project,the paper proposed a design scheme of five degree of freedom articulated coal sampling work device,and the device was body size design,workspace simulation analysis,integrated finite element analysis and structure optimization design,the main work in this paper is:First of all,it is introduced briefly that in the modern coal trade,the efficiency of coal sampling has a direct impact on the overall coal quality detection time,therefore,it is urgent to replace the artificial coal sampling with the automation equipment.Under the background of clear research,the paper introduces the composition and mechanism of coal sampler,and its working principle.At the same time,according to the work requirements put forward preliminary design scheme of the working device of joint coal sampler,with Matlab powerful mathematical calculation function and optimization function of the working device was optimized and solving mechanism dimensions.Secondly,the 3D model of the working device is established by SolidWorks,and the workspace and motion characteristics of the working device are obtained based on the motion simulation of SolidWorks Motion.The finite element model of working device is established,the complex physical contact problem is transformed into the rigid region in ANSYS by the constraint equation theory.The three-dimensional model of the working device is introduced into ANSYS,based on the analysis of three typical working conditions of coal sampler,the pin connection is simulated by node coupling and MPC 184 unit.The Link8 rod unit is used to simulate the cylinder connection,the whole finite element model of the working device is established,and the strength,stiffness and modal analysis are carried out.Finally,the paper introduces a method of CAD software model into the classical interface of ANSYS,and establishes the whole parametric model.Taking the minimum volume of the whole part of the working device as the objective function,the size of the arm,the middle arm and the small arm are chosen as the optimization parameters,and nine design variables are defined accordingly,the corresponding definition of 9 design variables and extract static optimization model results in the maximum displacement and stress as the state variables,to optimize the design of model.This paper is mainly based on the optimization theory,the integrated finite element analysis method,the five DOF articulated coal sampling device was put forward based on the optimization of car body size and Matlab structure optimization based on size of ANSYS,and finally realize the lightweight design of construction machinery to provide a reference value for the improvement and optimization of similar products,and provides an important theoretical basis for solving practical engineering problems.