The utility model discloses a core push plate holding mechanism for an injection blow molding machine, comprising a core mounting plate and a mandrel holder which are sequentially arranged on a turret of the injection blow molding machine. A compressed air inlet is arranged in the turret of the injection blow molding machine, a positioning piston moving up and down is arranged in the turret of the injection blow molding machine, a gland covering the positioning piston is arranged on the turret of the injection blow molding machine, an annular positioning member is arranged between the turret of the injection blow molding machine and the gland, a return spring for driving the positioning piston to move upward is arranged between the annular positioning member and the positioning piston, and a gas passage communicating the compressed air inlet with the inner cavity of the gland is arranged on the positioning piston. A horizontal drive hole communicated with the piston mounting cavity is arranged in the turret of the injection blow molding machine, a horizontal piston is movably arranged in the core mounting plate, the tail end of a piston rod of the horizontal piston passes through the horizontal drive hole, and a push plate for pushing the ejector rod on the mandrel is arranged at the other end of the piston rod of the horizontal piston. This mechanism ensures that the mandrel head of the installed blow mold mandrel will not move due to air pressure fluctuations.

Country Code: CN

Application Number: CN201620991032.7