Online sealing device and method for steel ladle cover oxygen burning sand filling observation hole

The invention discloses a steel ladle cover oxygen burning and sand filling observation hole online sealing device and method.The steel ladle cover oxygen burning and sand filling observation hole online sealing device comprises a steel ladle cover and a plurality of oxygen burning and sand filling observation holes in the steel ladle cover, small ladle covers are arranged at the oxygen burning and sand filling observation holes, the two sides of each small ladle cover are connected with the first end of a connecting rod, and the second end of each connecting rod is installed on an overturning support; the overturning support is provided with an overturning rod and a fixing plate used in cooperation with the overturning rod, the fixing plate is provided with a through hole so that the overturning rod can penetrate through the fixing plate to achieve overturning, a base is welded to the fixing plate, and a supporting rod perpendicular to the base is arranged in the middle of the base and used for supporting th