Hydraulic mould closure device for an injection moulding machine

摘要

The hydraulic mould closure device for an injection moulding machine has a pressure convertor, whose high pressure piston extends into a passage leading to the pressure side of the closure piston and closes it, when producing the closure pressure. Formed in the low pressure piston is an actuating cylinder into which an actuating piston extends. The actuating piston is connectable to the hydraulic tank and to the hydraulic pump. Adjacent to the low pressure cylinder of the pressure convertor there is a space whose diameter is larger than that of the low pressure cylinder. The actuating piston also has lateral openings which move out of the actuating cylinder as soon as the high pressure piston moves into the high pressure cylinder. The piston element of the pressure convertor is moved very rapidly out of the rest position into its active position so that operation occurs with reduced control times.