Ball and grinding Mill is mainly used to grind materials in mineral, cement, refractory, chemical industry, etc. Ball grinding Mill has dry and wet ways. When wet Ball grinding Mill works, certain water and other liquid will be added into materials to increase flow ability of materials, so the capacity is increased. When dry Ball grinding Mill works, capacity is affected because material flow ability is reduced, so absorbing wind device is needed on the outlet of Ball grinding Mill, and then negative pressure is formed in the Ball grinding Mill to increase flow ability of material, so the capacity is increased.