The main body of the ball mill is a low speed rotating cylinder horizontally mounted on two large bearings. The ball mill by the motor through the speed reducer and the surrounding large gear transmission, or by the low speed synchronous motor directly through the peripheral drive gear, driven rotary rotary cylinder is arranged inside the Department, the amount of steel ball grinding media. Grinding media under the influence of centrifugal force and friction force, be lifted to a certain height, parabolic or falling state.