Ore milling equipment is a large thermal power plant to improve the efficiency of coal an important means, so the role of ore milling equipment for the general power plant is very important. The ore milling equipment parts high and low speed, put the ore milling equipment into three different types, of which the power plant in the most commonly used pulverizer, medium speed mill common faults in the daily production is very common. Power plant in the speed of ore milling equipment is mainly the machine in the coal bucket in the coal first sent to the ore milling equipment into the pulverized coal, and then through the conveyor belt will be driven by hot air into the exhaust fan fan, and then enter Boiler furnace combustion, which is the general principle of the power plant mill. Power plant in the speed of coal pulverizer is fully charged in the power generation can be an important guarantee, so the speed of ore milling equipment repair is particularly critical. General power plant in the speed of ore milling equipment speed is generally 40 ~ 300r / min or so, and compact structure covers an area of ​​small, more efficient operation of energy saving and environmental protection, is currently in the thermal power plant using one of the most widely used, so control Personnel also need to have a simple knowledge of medium speed ore milling equipment maintenance. The medium-speed pulverizer is an important equipment in the coal-fired unit of the thermal power plant. The safety and stability of the operation are directly related to the whole work of the whole thermal power unit.