In the production of limestone, * of the materials need to be crushed. There are many factors that affect the material crushing system. These factors are very important for choosing suitable crushing equipment. Due to the physical characteristics of limestone, impact crusher is a common limestone crushing equipment. The following introduces the relevant information of the impact crusher. 　　 Impact crusher is the main equipment for limestone crushing. The crushing cavity of the crusher can receive bulk materials and crush them, but it will not compact the materials and overload the crusher. In the calibration area, each piece of material be extruded to form a uniform output of the required particle size, and the processing capacity is large. During the extrusion interval, the material can pass freely to improve processing capacity. Under the premise of given output granularity and processing capacity, combined with acceptable crushing cavity shape and bus bar angle, crushing cone eccentricity and swing frequency, power and liner consumption are guaranteed.