medium speed coal mill hydraulic system is mainly applied to exert appropriate pressure to grinding roller of coal mill to lift and fall the roller. it consists of hydraulic station and hydraulic cylinders with accumulator function. it is widely used in coal powder fabrication equipment. medium speed coal mill hydraulic systems produced by our company can realize variable load of coal mill to make the load force matches with the coal feeding amount of coal mill. as proportional control technology is applied to hydraulic system, stepless regulator is achieved and the roller can instantly lift and fall. it can reduce disc vibration, making the mill produce more uniform particles of coal, save energy, improve the working efficiency of coal mill and ensure the performance of the products can meet the different needs of customers. with the development of china's power and the world's power industry, the medium-speed coal mill hydraulic systems produced by our company have been all over the country's major power plants and chemical companies. some products have been exported to foreign countries. in 2014, we provided coal mill hydraulic and lubricate system for usa eaton company. the quality of this product can achieve international quality level.