Heat sealing mechanism of bag feeding type packaging machine

The utility model discloses a heat sealing mechanism of a bag feeding type packaging machine, which comprises a base, the upper end of the base is fixedly connected with a placing table, the placing table is provided with a fixing mechanism for fixing a packaging bag, the upper end of the base is fixedly connected with a U-shaped frame, and the upper end of the U-shaped frame is fixedly connected with a hydraulic oil cylinder. The movable end of the hydraulic oil cylinder penetrates through the upper end of the U-shaped frame and is fixedly connected with a mounting frame, a sliding groove is formed in the lower end of the mounting frame, two sliding blocks are symmetrically and slidably connected to the inner wall of the sliding groove, fixing rods are fixedly connected to the lower ends of the two sliding blocks, and a first heat sealing cutter is fixedly connected to the side wall of one fixing rod. A groove is formed in the side wall of the first heat sealing cutter. The two-way lead screw is driven to ro