Study On Electromechanical Coupling Dynamic Behavior Of Shearer Cutting Part

As an indispensable engineering equipment for the completion of coal mining work,the shearer is the most important working part.Because the cutting unit is responsible for the task of breaking coal,it will directly contact the rock,the impact load on the drum will fluctuate sharply,and the key components of the transmission system are prone to failure.Dynamic analysis of the shearer drive system is one of the prerequisites for solving component failures,but when summarizing the research results of previous scholars,it is found that the existing research on the transmission system of the cutting unit mostly uses static motors,and the mechanical characteristics of the motors cannot be extracted in the dynamic simulation.Therefore,based on a large-scale AC traction shearer,this paper constructs the electromechanical coupling dynamics model of the cutting part transmission system,and the dynamic response of the transmission system under the cutting dynamic load,the strength and fatigue life of the planet carrier of the key part of the cutting part are studied.The research content of this article is mainly divided into the following four parts.In the first part,in order to study the dynamic response of the electromechanical transmission system of the shearer when considering the mechanical characteristics of the shearer cutting part motor under the impact dynamic load condition,the dynamics of the shearer cutting part transmission system is established in ADAMS Model,the cutting part motor model was established in Simulink,and the ADAMS/Controls module combined the transmission system model and the motor model to conduct electromechanical coupling simulation and analyze the results.The dynamic response of each gear of the transmission system under impact load is obtained,and the acceleration time-frequency curve of the planet carrier is extracted,and the analysis is carried out.It is proved that the electromechanical coupling model can reflect the mechanical characteristics of the motor.In the second part,in order to obtain the load of the drum,the process of cutting coal and rock by the shearer is simulated.Construct the geometric model of the cutting drum and the coal and rock layer,import Mechanical APDL for finite element pre-processing such as meshing,and export the K file to solve it through the explicit dynamics software LS-DYNA.The threedirectional force and axial torque of the drum cutting coal and rock were obtained,which provided the load for the follow-up study.In the third part,based on the flexible multi-body system modeling theory,the flexible body model of the primary and secondary planet carrier is established through Mechanical APDL,replacing the rigid body model in ADAMS,and constructing the rigid-flexible coupling model of the cutting part.The rigid-flexible coupling dynamics simulation with and without the electromechanical coupling is carried out,and the stress distribution and load law of the planet carrier under the cutting load are analyzed.The study found the stress concentration area of the primary and secondary planet carrier and the stress time history of the stress concentration area.In the fourth part,the static strength analysis of the key components of the planet carrier was carried out through ANSYS Workbench,and the fatigue life of the planet carrier was analyzed using the n Code fatigue software,and the fatigue life of the primary and secondary planet carrier was obtained.Through the study of the electromechanical coupling system of the shearer cutting part,this article provides ideas and methods for the dynamic research and analysis of similar electromechanical coupling systems.