Coal mill drum screen cleaning device

The utility model discloses a cleaning device for a drum screen of a coal mill. The cleaning device comprises a spray pipe, a water pump, a water storage tank, a semi-cylindrical shell matched with the outer edge of the drum screen, and a drum shell covering the outer sides of the drum screen and the semi-cylindrical shell, a spraying pipe is fixed to the inner wall of one side of the roller shell, the spraying pipe is arranged above the roller screen and arranged in the axial direction of the roller screen, and a plurality of spraying heads arranged towards the axis of the roller screen are evenly installed on the spraying pipe in the length direction. A water pump and a water storage tank are arranged outside the roller shell, a water outlet of the water storage tank is communicated with an inlet of the water pump, and an outlet of the water pump is communicated with a water inlet of the spraying pipe; a rotatable semi-cylindrical shell is connected between the roller shell and the roller screen through a r