This utility model discloses a core rod assembly facilitating preform exhaust in an injection blow molding machine, comprising a core rod body, a core rod head, a thimble, a pressure spring and a star nut. A first air outlet, an air passage and a first air inlet are arranged in the core rod body, a guide sleeve is slidably arranged in the first air outlet, a second air inlet and a second air outlet are arranged on the guide sleeve, a thimble is movably arranged in the air passage in a penetrating manner, a pressure spring is arranged in the first air inlet, a star nut is threadedly connected to the thimble and abuts against the pressure spring, a core rod head is connected to the guide sleeve and blocks the first air outlet of the core rod body, an air groove is arranged in the core rod head, a plurality of third air outlets are arranged on the core rod head, a plurality of insert holes communicated with the air groove are arranged on the core rod head, and breathable steel inserts are embedded in each insert hole. The air in the tube preform cavity between the core rod assembly and the preform mold can be completely discharged through the breathable steel inserts, so that the air will not adversely affect the plastic preform.

Country Code: CN

Application Number: CN202223269504.2