Sealing structure of powder feeding cavity

The utility model discloses a sealing structure of a powder feeding cavity. The sealing structure comprises a charging barrel, the rotating shaft is perpendicular to the flowing direction of the powder and is inserted into the charging barrel; the turning plate is fixedly connected outside the rotating shaft and clings to the inner side of the charging barrel; the first rubber ring is connected to the inner side of the charging barrel and is attached to the upper part of the turning plate; the second rubber ring is connected to the inner side of the charging barrel and attached to the lower portion of the turning plate, and the second rubber ring and the first rubber ring are in central symmetry with the center of the rotating shaft as the midpoint; the counter weight structure is arranged on the side, close to the second rubber ring, of the bottom of the turning plate, the rotating shaft and the turning plate are arranged to be matched with the first rubber ring and the second rubber ring, in the discharging