The present utility model discloses an oil circuit control system for a mold clamping mechanism of an injection blow molding machine, comprising an oil tank, a liquid pump, a servo motor for controlling the liquid pump, a mold locking cylinder, a plunger cylinder and a fluid filling valve. The rod cavity of the mold locking cylinder is cavity A, the rodless cavity of the mold locking cylinder is cavity B, the plunger cylinder takes the piston rod of the mold locking cylinder as a cylinder body, the piston rod of the plunger cylinder is arranged toward cavity B of the mold locking cylinder, a plunger cavity for the expansion and contraction of the piston rod of the plunger cylinder is arranged inside the piston rod of the mold locking cylinder, a first oil circuit is arranged between the oil tank and the plunger cavity, a second oil circuit is arranged between the oil tank and cavity A, the first oil circuit and the second oil circuit form a mold closing oil circuit, and a mold locking oil circuit and an oil return circuit are arranged between the oil tank and cavity B. The oil circuit control system for the mold clamping mechanism of the injection blow molding machine utilizes the pressure difference generated during the movement of the oil cylinder to directly absorb oil from the oil tank, and the speed is much faster than direct oil filling by the oil pump motor.

Country Code: CN

Application Number: CN201721877656.7