Jaw crusher is one of the most important crushing machine in the stone crushing production line. It can be not only used for crushing stone materials, pebble and coal and be called stone jaw crusher, but used for manufacturing cement aggregate. Jaw crushing machine is mainly used for primarily crushing the raw materials, so that is also called primary jaw crusher or primary crushers. According to the feeding width, jaw crusher can be divided into large, medium and small sized. The jaw crushers have many advantages such as simple structure, easy manufacturing, reliable working condition and convenient operation and maintenance.