Ball grinding mill manhole door cover device

The utility model relates to a ball grinding mill manhole door cover device. A manhole door of a ball grinding mill barrel is provided with a manhole door cover, the manhole door cover comprises a door cover plate, a supporting device and an abrasion-preventing liner plate, and the abrasion-preventing liner plate is fastened with the door cover plate through a liner plate bolt. The door cover plate is a rectangular steel plate, a bolt through hole is formed in the periphery of the door cover plate, and the manhole door cover is fastened on a connecting flange of the manhole door through a fastening bolt. The ball grinding mill manhole door cover device is characterized in that the supporting device is a supporting frame with no less than three Y-shaped cross sections, the supporting frame is formed by welding one side of each of two slanted bar plates with one side of a vertical bar plate, an included angle formed by the two slanted bar plates ranges from 55 degrees to 65 degrees, the vertical bar plate is perpendicular to the door cover plate, another two sides of the slanted bar plates are welded on the door cover plate, and the other side of the vertical bar plate abuts against the abrasion-preventing liner plate. The ball grinding mill manhole door cover device can be quickly mounted and dismounted, improves the ball grinding mill overhaul efficiency and reduces maintenance cost.