1.simple structure low operation cost. Using the principle of stone strike stone , smaller wear. 2.broken rate is high, energy conservation 3.with fine, coarse grinding function 4.little affected by material moisture content, humidity can reach 8%. 5.working noise is less than 75 db, less dust pollution. 6.suitable for breaking medium hard, especially hard materials. 7.products are cubic, packing density is big, a very small iron pollution 8.little wearing of the impeller , easy maintenance.