The product feature of the double roll crusher is that it has two rolls and the surface is smooth; The surfaces of the two rollers of another type of roller crusher are both serrated; One of the roller surfaces is smooth, while the other roller surface is serrated. The roller crusher with smooth surfaces on both rollers mainly plays a role in squeezing, grinding, and crushing materials. This equipment is often used for medium to fine crushing of materials such as clay, coal, clinker, and limestone.