Hydraulic power converter for use in hydraulic drive of movable mold clamping plate of plastic injection molding machine, has filling valve controllable by movement of hydraulic piston relative to another hydraulic piston

摘要

The converter has a coupling device (43) provided in such a manner that a hydraulic piston (20) is moveable in synchronization with another hydraulic piston (40) by the coupling device. A filling valve (50) is controllable by the movement of the piston (40) relative to the piston (20). The coupling device is a pre-stressed spring, which is extended between the two hydraulic pistons by a pressure chamber (44). The piston (20) comprises a stopper (42) that is connected to the piston (40), where the stopper presses against the spring to the piston (40).