As our country has invested a lot of money to look for mineral resources, through hard work by our geological workers, now our country find various mineral resourcses. There were several energy region to be gradually depleted, the development of new mineral resources will have demand for large mining equipment. In recent years, the coal resources in Xinjiang region and Ningxia region will need our country to exploit as soon as possible. The exploitation of these resources will certainly have the demand for a lot of Raymond mill, jaw crusher, cone crusher, vertical shaft impact crusher, impact crusher,etc.Energy conditions Including the type of energy and capacity,energy supplies,energy supply stability and reliality ,the self-sufficiency of self-enery used in the equipment Mine size and the yield range The parameters directly affect the level and quantity of production equipment specifications. To make the production equipment adapt to the mine scale, and the technical and economic benefits from the early stages of building mine to built mine from the early stages to each production stage. Equipment techical and economic aspects To choose the best production equipment,the total principle requirements are:advanced technology,practical production,reliabilty,easy modification,ecomomic and rational. When selecting one quipment,we must consider the following aspects: Good use,which means that can meet the production process requirements,strong adaptability, convenient operation, advanced technical performance, high efficiency, ease to match with related equipment. Good reliability,which refers to the reliable working precision,low failure rate,high attendance,long average life in the case of playing fully its function. Good maintainability, which refers to reasonable equipment structure,high degree of components standardization and hongxingization, good interchangeability,easy inspection, testing and maintenance Good economy, which means less energy consumption, low...