Hydraulic mold locking unit for injection molding machines and presses, has an upper die platen moved by hydraulic cylinders, one with a double-action piston controlled by a proportional valve in the pump system

摘要

A hydraulic mold-locking unit for injection molding machines etc., with a fixed lower die platen (14) and an upper platen (12) moved by at least two hydraulic cylinders, one (16) with a double-action piston (17) with both sides connected to a hydraulic pump and the other (18) connected to an accumulator (30), in which the pump system has a proportional or control valve (28) which operates so that, on closing, the dynamic pressure in cylinder (16) can be changed, preferably controlled.