通过对离心磨矿机滚筒及介质运动简化模型的分析研究，建立了其滚筒和介质运动的基本方程式；导出了介质（钢球）脱离滚筒被“抛起”的力学条件，即临界转速ｎｅ＝３０／ｅ．在此基础上，运用所得到的基本方程式，对介质及滚筒的碰撞时间进行了数值计算和运动过程的计算机仿真，最后将仿真结果与试验观察结果进行比较，从而验证了结论合理可行． Through the analysis and research on the simplified model of the centrifugal mill roller and the media, the basic equations of the drum and the media movement are established. The mechanical condition that the media (steel ball) is “tossed away” from the drum is derived, that is, the critical speed ne = 30 / e. On this basis, the numerical simulation of the collision time between the media and the roller and the computer simulation of the movement process are carried out by using the basic equations obtained. Finally, the simulation results are compared with the experimental observations to verify the conclusion is reasonable and feasible.