Roller crusher is a kinds of stone crusher. Roller crusher is the machine that uses roller surface's friction force to deliver the material to crushing zone, and then the material is cracked by extrusion. The roller crusher is used for coarse crushing, or when large size reduction ratio is necessary. The roller surface usually appears teeth or groove to enhance cleaving force. Roller crusher can be divided into single roller crusher, double roller crusher, or mutiple roller crusher based on roller quantity. This crusher can be used for coarse crushing, medium or fine crushing of hard and medium hard material such as coal, limestone, clinker or feldspar, and so on.