Dynamical Torque Simulation And Test Of Large Ball Mill Based On Discrete Element Method

The large size of the ball mill is the trend of the development of the mining machinery, especially the research on the starting torque of the ball mill is always a technical problem of domestic and international attention. This paper is supported by the National Nature Fund Project(NO.51265020) named “Design method and theory of heavy hydrostatic bearing with hollow shaft under multiple coupling fields”. The dynamic torque load of large mill was studied by using discrete element software EDEM.(1) The ball mill test was created to study the torque and bearing performance of the motor drive system. Through the enterprise investigation and research, the design scheme of the test bench was initially determined. Mainly including the mechanical system, transmission system, hydraulic system and testing system. The static analysis of the key parts of the test bench is carried out. The results show that the bearing part is reasonable in structure, and the strength and rigidity of the bearing meet the requirement of the experiment.(2) This paper establish the model of the test mill by discrete element method. Based on the existing test conditions and certain assumptions, the discrete element simulation under different parameters is obtained. The influence of different grinding parameters on the dynamic load spectrum of the whole working process is obtained.(3) Testing the ball mill test bed, and get the change law of the torque of the drive system under different working conditions. The test results are coMPared with the discrete element simulation results by studying the dynamic load of the test bench. The results show that the simulation results and test results are relatively small, and then verify the rationality of the application of discrete element software EDEM in dynamic load analysis of large ball mill.(4) The discrete element model of large ball mill is established in this paper. And the influence of different grinding parameters on the dynamic torque load of the whole working process of large ball mill is obtained. 16 groups of orthogonal experiments were reasonably determined based on certain assumptions and the range of different grinding parameters. And the factors that affect the torque load of ball mill are determined by the range analysis method.(5) The torque value of the whole machine is obtained by establishing the Simulink model of large ball mill. The dynamic model of large ball mill is established. Based on certain assumptions, the ball dropping motion is analyzed. The Simulink result and the result of the discrete element simulation are coMPared and analyzed. The results show that there are some errors in the simulation results of the two kinds of simulation results. The error analysis is used to modify the initial parameters of the discrete element simulation. Make up some deficiencies of the discrete element model.In this paper, the discrete element method, numerical simulation and experimental test of Simulink combination of large ball mill under different working conditions of the torque load are studied. It not only provides the boundary condition for the fluid solid coupling analysis of the oil film pressure, but also provides an important reference data for the design optimization of the large mill. It is of great significance to analyze the failure causes of the key components.