When the material moisture content is high and the ventilation of ball mill is poor, the water vapor will remain in the ball mill, which will lead wet powder adhering and blocking the drum seam and affect the grinding efficiency. At the same time, in the process of grinding material it will form a " layer" in the working surface of lining board due to electrostatic leading the grinding function greatly weakened.Therefore, the production of the ball mill will decrease and the consumption will increase.Obviously, when the ventilation of the ball mill is poor, the simple solution is add axial fan at the top of ball mill and at the same time plugging the discharging chute to prevent air leakage. In the same way, the wind lock systems also must be do well, otherwise, the wind will discharge from the mouth of discharge port and make the ventilation short circuit causing no wind in ball mill.At present static-pressure bearing depends on his characteristics, such as high reliability, long service life, small energy consumption, big carrying capacity and etc, it is widely used in the large energy saving ball mill. No matter ball mill is static or turned, ball mill needs to rely on the oil bearing bush and quill shaft under the action of outside high pressure to form a thicker oil film in order to realize all the liquid lubricant.The lubricating state and oil film pressure of static-pressure bearing has very small concern with the hollow shaft speed. When ball mill starts to work, bearing bush and quill shaft is always in the pure liquid friction and lubrication condition, so it is not easy to polish the bearing bush. But the bearing capacity of static-pressure bearing is some concerned with hydraulic oil, if we improve hydraulic, so we just can improve the bearing capacity of the oil film. Since liquids static-pressure bearing works in the pure liquid-lubrication state, and the friction surface does not directly contact, it has some feature of tiny wear, long service life,...