Optimal Design Of Shearer's Traction Mechanism Based On Whole Machine Dynamics

During the coal mining operation,the shearer will be frequently subjected to irregular loads caused by the cutting of the coal seam.The walking wheel-pin row traction mechanism is an indispensable part of the shearer.The meshing between the walking wheel and the pin row is a non-lubricated transmission.Therefore,the traction mechanism often has tooth surface wear and gear tooth breakage due to irregular loads.The working state of the traction mechanism determines the operation of the entire equipment.This paper takes the whole shearer as the research object,analyzes the movement state of the shearer and the force status of the traction mechanism in the process of cutting coal and rock,and finds out the factors that cause the failure of the traction mechanism.Based on the results of dynamic analysis optimize the design of the parameters of the traction mechanism.The finite element model of the shearer drum cutting coal and rock is established in LSDYNA using finite element explicit dynamics technology,and the contact between the drum model and the coal and rock mass model is set,and then the solver is used to solve the model and obtain the coal and rock The load of the center of mass of the drum during the cutting process.Based on the rigid-flexible coupling multi-body dynamics technology,using the data interface between ADAMS and ANSYS to establish the rigid-flexible coupling dynamics model of the shearer,apply the load obtained by the coal and rock cutting simulation to the drum,and consider the mechanical characteristics of the asynchronous motor,The two traveling wheels of the coal shearer are respectively applied with a rotary drive with motor characteristics,and the stress distribution of the whole machine,the running state of the whole machine and the contact force load of each part of the traction mechanism are obtained through dynamic analysis.After the traction mechanism is analyzed in theory,the assembly model of the traction mechanism is established,the finite element contact model of the traction mechanism is established by importing ANSYS/Workbench,and the load obtained from the rigid-flexible coupling dynamic analysis of the whole machine is applied to the finite element model.The transient dynamics analysis was carried out to obtain the stress distribution of the guide shoe,the traveling wheel,and the change law of the maximum tooth root bending stress and tooth surface contact stress of the traveling wheel with the rotation of the traveling wheel,and the possible causes of the traction mechanism were analyzed.The optimization of the organization provides a reference.Establish the parametric equations of the tooth profile curve of the traveling wheel and the pin row,construct the parametric model of the meshing of the traveling wheel and the pin row,and determine a group of traveling wheels that can be optimized through the limited analysis and comparison of different tooth-shaped traveling wheels and pin rows.The assembly model of the pin row provides the basis for the optimal design of the traction mechanism.Finally,based on the dimensional parameters of the traction mechanism,the finite analysis response of the traction mechanism,and the results of multi-body dynamics analysis,an optimized response surface model of the traction mechanism was constructed to improve the load-bearing capacity of the traveling wheels and the running stability of the whole machine as the optimization objective,and the response was responded to by genetic algorithm.The surface was optimized.