After the second repurchase after 2015, and the customers gave good feedback, and the production line takes advantages of stable and safe operation, large capacity and green process. In view of the problems about high requirements of petroleum coke pulverizing process and small space for equipment selection, LM vertical mill of Liming Heavy Industry has achieved a breakthrough in the field. It integrates crushing, drying, grinding, classification and transportation together, which means it covers small floor area. At the same time, the hydraulic pressurization method can increase the grinding force, so as to increase the capacity and improve the grinding efficiency.