Multi-bottle type changing mechanism for filling machine

The utility model discloses a multi-bottle type changing mechanism for a filling machine. Protection plates are arranged on the two sides of each of a filling part guide plate structure, a conveying guide plate structure, a gland guide plate structure and a bottle outlet guide plate structure and matched with corresponding star wheels to form corresponding guide rails. The bottle feeding star wheel and the conveying star wheel are installed in arc-shaped grooves in the two sides of the guide plate structure of the filling part through rotating shafts correspondingly. A variable-pitch screw mechanism is arranged at the bottom of the bottle feeding star wheel; one end of the variable-pitch screw mechanism is propped against the outer end of the arc-shaped groove in the lower side of the guide plate structure of the corresponding filling part; a bottle blocking star wheel is installed obliquely above the other end of the variable-pitch screw mechanism, a conveying guide plate structure isarranged below the conve