A mould locking device for a
bottle blowing
machine comprises a mould frame base, a front mould plate, a middle mould plate, a rear mould plate and a guide column, wherein the front mould plate, the middle mould plate and the rear mould plate are arranged on the mould frame base, the guide column penetrates through all mould plates, a left mould is positioned on the middle mould plate, a right mould is arranged on the front mould plate, and a hinged mould
locking mechanism is symmetrically distributed and movably hinged between the middle mould plate and the rear mould plate. The mould locking device is characterized in that a flat
piston cylinder is installed between the right mould and the front mould plate. The hinged mould
locking mechanism is formed by two hinge rods which are movably hinged with a connection rod A and a connection block, the two hinge rods are movably hinged through a
carriage, and a
servo motor driving roller lead screw is in screw connection with a nut on the
carriage. The mould locking device has the advantages of using an ordinary air cylinder or a hydraulic oil cylinder or even the
servo motor push lever principle to open and close a mould so as to be quick in opening and closing speed and small in
energy consumption; and individually using a mould locking air cylinder with large cylinder
diameter and short
stroke to lock the mould so as to be large in mould locking force, high in work efficiency and the like.