It's crushing mill as raw materials and training equipment. Roller ring wear-resistant material used ductile iron and alloy steel, and by the quenching treatment. Hardness, respectively, up to HRC60 °, 62 °, HRC48 °, 55 °; roll circles There is no distributor, not only the entire width of the roller circle can be broken to play the role of broken improve fineness and yield, but also enable the roller ring wear uniform , an effective solution to pull trough between roller circle phenomenon.