Research On Shearer Torque Limiter Of Traction Part Based On Smooth Finite Element

Shearer traction part as an important part of shearer,its role is to provide power for shearer to walk along the working face on the scraper conveyor to achieve bidirectional coal mining.The underground working environment is harsh,the shearer works under the conditions of water surge,gas,rock burst pressure and so on,especially the shearer when cutting coal to withstand alternating impact load,must be shearer traction part overload protection to prevent traction drive chain bearing,gear and other damage or motor burn.Before the coal mine shearer traction protection device mainly through traction motor current changes to determine whether overload,because traction part of the drive chain is long,response is not timely,often appear sprocket damage,gear teeth broken and other failures.Therefore,the concept of protecting traction transmission chain by torque limiter is proposed,and a device for overload protection,torque limiter,is designed.The torque limiter is studied and analyzed based on smooth finite element method(FS-FEM)and dynamic simulation analysis.The details are as follows:First of all,according to the technical parameters of the MG400/980-WD shearer of a certain company,the torque value transferred by the traction motor to the torque limiter is obtained,and then combined with the corresponding design criteria to determine the structure size of the torque limiter.Next,the theoretical squeezing stress of the output shaft of traction drive part of the torque limiter is compared with the allowable value,and the obtained rated torque value is compared with the calculated value transferred to the torque limiter before,and finally the parameters and structure of the torque limiter are determined.Secondly,smooth finite element method(FS-FEM)was used to study the copper sleeve,a key component of torque limiter.The pressure of the elastic expansion sleeve is equivalent to the surface of the copper sleeve,and the corresponding MATLAB program is compiled to analyze the copper sleeve according to the smooth finite element theory based on the surface to divide the problem domain,construct the smooth domain,traverse the smooth domain,and solve the deformation and stress.The obtained deformation and stress values are compared with the previous theoretical calculation values.Finally,the axial torque value of copper bushing obtained by integral method is compared with the critical skid torque value,and it is concluded that the torque value does not exceed the critical value.Finally,the dynamics analysis of torque limiter is carried out.The copper sleeve,inner elastic ring and outer elastic ring are flexible and constitute a rigid and flexible coupling system with other components.By setting the working environment,material properties and motion pair of ADAMS,the velocity curves of the three flexible components and the contact force and moment curves of the copper sleeve and the secondary planetary frame are obtained in the postprocessing module.It is concluded that the torque limper can play the role of overload protection.