One side of the middle part of the outer shell below the milling disc of the layer is provided with a discharge port.

Nianpan floor, Nianpan outer ring were added to improve anti-wear protection plate rolling, grinding the material effects and the whole of life.

Mixing equipment known as a wet mill, its structure is similar with the dry mill, but Nianpan is no sieve, grind mound less, there is discharge organizations.