The invention discloses a cover screwing device for a filling
machine. The cover screwing device is used for screwing
bottle covers on bottles and comprises a mounting seat, a rotating piece, a coverscrewing mould and a driving mechanism for driving the mounting seat to move. A cavity is formed between the mounting seat and the rotating piece; an upper magnetic ring, a lower magnetic ring and a magnetic conduction ring with the same size are arranged in the cavity, the upper magnetic ring and the lower magnetic ring are fixedly connected with the mounting seat, and the magnetic conduction ring is fixedly connected with the rotating piece; suction cups are embedded in the lower end face of the cover screwing mould, and a ventilation
pipe communicating with the suction cups is arranged in the rotating piece; and reinforcing ribs for reinforcing the firmness of the suction cups are arranged at the connecting positions of the suction cups and the cover screwing mould. Air pumping is conducted on the ventilation
pipe through
vacuum extraction equipment on the filling
machine, thus the suction cups can adsorb the
bottle covers of different specifications, the situation that an originalcover screwing mould can only deal with screwing of
bottle covers of the single specification is broken, meanwhile, the suction cups are reinforced, and thus in the screwing process, the suction cupscan provide sufficient torque to screw the bottle covers.