The utility model discloses a new speed reduction mechanism for the injection unit of an injection blow molding machine, comprising a base, a plasticizing barrel, a servo motor and an injection oil cylinder as a power source. It is characterized in that a slide rail is fixed on the upper surface of the base through bolts, a first slide seat and a second slide seat are sleeved on the upper surface of the slide rail, the second slide seat is arranged on the left side of the first slide seat, a barrel fixing seat is fixed on the upper surface of the second slide seat through bolts, the plasticizing barrel is arranged through the interior of the barrel fixing seat, a plasticizing screw is rotatably connected inside the plasticizing barrel, a reduction gearbox is arranged on the right side of the plasticizing screw, and the output end of the reduction gearbox is connected and fixed with the plasticizing screw through a coupling. The utility model can eliminate the standard reducer between the screw and the servo motor, so that the transmission shaft of the speed reduction mechanism is directly connected with the screw, reducing intermediate transition links and the probability of failure.

Country Code: CN

Application Number: CN202021399025.0