The invention relates to the technical field of injection blow molding machines, in particular to a single-cylinder pre-plasticizing injection structure of an injection blow molding machine, which comprises an injection oil cylinder and an oil motor. The oil motor is fixedly connected to the injection oil cylinder via a flange, and a piston rod is telescopically connected inside the injection oil cylinder. A transmission shaft is rotatably connected inside the piston rod and movably connected to the output end of the oil motor. A circulating oil circuit control mechanism is assembled on the surface of the injection oil cylinder, which includes a housing fixedly connected to the injection oil cylinder. A hydraulic drive assembly, a circulating oil supply assembly and a distance adjustment assembly are mounted inside the housing, and a main oil pipe is fixed on the outside of the housing, connected to the oil inlet end of the hydraulic drive assembly. The oil outlet end of the hydraulic drive assembly is connected to the oil inlet of the oil motor through a conduit. The invention reduces power consumption and use cost, and the reciprocating speed of the piston rod can be well matched with the rotational speed of the oil motor.

Country Code: CN

Application Number: CN202111635420.3