Hydraulic system for the mold clamping unit of a plastics injection molding machine
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Dec 23, 1987
filing date -
Dec 23, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic actuator assembly for use in a mold clamping unit of an injection molding machine. The actuator assembly serves as a rapid-travel drive for mold opening and closing movements and as a source of elevated mold clamping pressure. Among the hydraulic elements contributing to the operation of the mold clamping unit are a power piston for effecting elevated mold clamping pressures and a drive piston for effecting rapid die closing movements. With the hydraulic actuator system of the present invention, it is possible to control the operation of the mold clamping unit based on two-sided hydraulic influencing of the power piston and the drive piston.
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