Medium speed coal mill

A medium-speed coal mill belonging to the crushing device technical filed relates to a power house fuel coal mill in detail. The utility model includes a bracket, an inlet passage on upper part of the bracket for the entrance of the raw coal, an outlet passage on the upper part of the bracket of the exit of coal powder, a millstone drive motor installed at the lower part of the bracket, a reducer connecting the motor, a rotary millstone on the reducer, a grinding roller pressed on the millstone, a loading frame which is connected with the grinding roller shaft over the grinding roller and a cylinder loading oil supply mechanism. The improvement is that a counterforce hydraulic loading mechanism consisting of a counterforce oil pump, a throttle valve, a proportional relief valve and an energy accumulator is added on the pipeline which is connected with the cylinder non-rod chamber and the oil tank. The active effects of the utility model are that the added counterforce hydraulic loading control mechanism is able to absorb the vibration of the coal mill, and makes the working rotate speed improved by over 25% and the maximum load improved by over 65%, largely improving the output of the coal mill and the automatic control performance of the coal mill.