Negative pressure filling device of negative pressure syrup filling and capping machine

The invention discloses a negative pressure filling device of a negative pressure syrup filling and capping machine, which comprises a conveyor and a material box, the material box is placed on one side of the conveyor, a mounting rack is fixedly erected above the conveyor through support legs, a charging barrel is fixedly mounted on the top surface of the mounting rack through a fixing rack, a piston is slidably connected in the charging barrel, and the piston is slidably connected with the conveyor. A pull rod is fixedly mounted on the top surface of the piston, penetrates through the top surface of the charging barrel and is fixedly provided with a top plate, a spring sleeves the outer side of the pull rod between the top plate and the top surface of the charging barrel, and a discharging pipe is connected to the center of the bottom surface of the charging barrel in a penetrating manner. The automatic quantitative feeding device has the beneficial effects that automatic quantitative feeding is completed t