Design Of New Type Transmission System For Shearer

From the latest "China mineral resources report" issued by the Ministry of land and resources in 2017,our country has officially become the third largest coal resource country,which is second only to the United States and Russia.In recent years,with the rapid rise of China,all walks of life hope to catch the fast train of China to occupy a favorable position in the development of the world industry.The demand for resources is essential for the development of the industry,and the demand for coal resources has been increasing in recent years.On the premise of safety,low energy consumption and pollution reduction,the improvement of mining efficiency of coal mining equipment is the subject of the research work of coal mining machinery in China.Most of the shearer cutting system transmission systems are basically fixed at present.It is composed of a spur gear reducer and a planetary gear reducer.The spur gear reducer uses multiple sets of spur gears to realize the primary deceleration and far distance torque transfer function of the cutting motor,and uses the planetary gear reducer to realize the large transmission ratio,and provides the input of the cutting section with low speed and large torque.In this paper,a new torque transmission design method is proposed for the problem of redundant structure and high energy loss in the transmission system of the straight gear reducer.In order to improve the transmission efficiency,simplify the structure and reduce the cost,the two-stage bevel gear group is used to replace the multi-group of spur gear to realize the far distance torque transmission and initial deceleration.In addition to the theoretical checking calculation,the transmission system needs to be further verified by software simulation analysis to verify the reliability of the transmission system.First,referring to the relevant provisions of the People’s Republic of China coal industry standard,the parameters of the basic design are defined and the structural parameters of the transmission system are determined with reference to the relevant design criteria,and the design parameters of the final structure are checked and checked.Then,the design parameters are checked and all parts are assembled,and the interference is checked.The structural statics analysis of three drive shafts and two sets of bevel gears is carried out to understand the distribution of the equivalent stress,contact stress and bending stress and compare with the theoretical calculation.Modal analysis is used to determine whether the structure of the design will resonate in the actual work.Finally,the structure of the bevel gear is simulated and analyzed.According to the final motion curve,the actual operation of the bevel gear is understood and the impact of the top clearance will be judged.Through theoretical verification,finite element analysis and dynamic simulation,the method is verified and the structural design parameters are continuously adjusted.Finally,the design parameters of shearer’s new transmission system are completed.