Closing device for pebble coal discharge of coal mill

The utility model relates to a closing device for pebble coal discharge of a coal mill. A bin is arranged at a pebble coal discharge port of the coal mill, a feed valve is arranged at an inlet of the bin, a discharge valve is arranged at an outlet in the bottom of the bin, a vertically moving cover plate is arranged on the outer diameter of the outlet, hydraulic lifters are arranged on the cover plate, an inlet of a decompression pipe extends to a position below a cover plate hole, an outlet of the decompression pipe is communicated with a dust suction pipe, an elastomer is arranged on the lower surface of the cover plate, and the cover plate can move vertically along the outer diameter of the discharge port and the outer diameter of the decompression pipe under the actions of a hydraulic control valve and the hydraulic lifters. When the pebble coal is discharged, a conveying vehicle is arranged at the outlet of the bin, the cover plate is dropped and sealed to the top of the conveying vehicle by the hydrauli