Welding wire feeder and injection molding shell thereof

The utility model discloses a wire feeder for welding and an injection molding shell and a pinch roller carrier of the wire feeder, the wire feeder comprises the pinch roller carrier, a driving motor arranged on the rear side of the pinch roller carrier and a pinch roller assembly rotationally arranged on the upper end portion of the pinch roller carrier, a wire inlet and a wire outlet are formed in the front side face of the shell, and the central axis of the wire inlet and the central axis of the wire outlet are located on the same horizontal plane; the shell comprises a shell body A and a shell body B, the shell body A is connected with the shell body B through threads, the shell body A and the shell body B are both of an integrated injection molding structure, and reinforcing ribs are formed on the shell body A; a containing cavity used for containing the pressing wheel is formed in the pressing wheel frame, sliding grooves are symmetrically formed in the two inner side walls of the pressing wheel frame,