Roller crusher is mainly applied in cement, metallurgy, chemical, electric power, coal and other industries for crushing various materials of medium hardness like limestone, slag, coke, coal and other materials. According to the numbers of the roller, it is divided into single roller crusher, double rollers crusher and multi-rollers crusher. It has simple structure, less phenomenon of over-crushing, and reliable operation.

The double roller crusher is mainly composed of rollers, high manganese steel roller sheet, steady bearing of roller, depress device and regulating device and driving device. Adjustment of discharge particle size: the clearance between the two rollers can be adjusted to change the sizes of final products. There is a wedge or gasket regulating device between two rollers, and an adjustable bolt on the top of wedge. Wedge block will drive the movable roller leave the fixed one when it is pulled up by adjustable bolt, and the gap between rollers is bigger and also the discharge particle size become larger; when wedge block moved down, the movable roller may close the fixed roller under the force of pressure spring and the discharge particle size become smaller. As for gasket device, the discharge particle size may be adjusted according to the number of gaskets. The fixed part of roller and movable roller are driven by the motor via reducer and v-belt, the raw materials fall into the part between the two rollers from inlet of the machine. The two rollers rotate inward simultaneously. The materials are extruded, crushed and grounds, then the end products come out from the bottom of this crusher.