Hydraulic control apparatus for injection molding fluent plastic

Motors: expansible chamber type – Working member position responsive motive fluid control

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Details

60468, 60DIG2, 91 48, 91451, 91459, 164154, 425145, F15B 1520

Patent

active

040446530

ABSTRACT:
Hydraulic control apparatus for controlling the rate of flow of a fluent plastic from an injection nozzle of an injection molding machine wherein an injection ram is connected to a hydraulic piston in a hydraulic cylinder. The control apparatus controls the pressure exerted by a hydraulic fluid in the cylinder by means of a main hydraulic circuit including the cylinder, a valve and a pump connected in series and a main line pressure valve connecting in parallel a plurality of pilot pressure control valves having different pressure set points to the main line. The pilot pressure control valves are operated in sequence by an electrical relay and timer circuit, or a combination of such circuit and limit switches.

REFERENCES:
patent: 2265800 (1941-12-01), Connor
patent: 3164065 (1965-01-01), Frantz
patent: 3463036 (1969-08-01), O'Conner
patent: 3474824 (1969-10-01), Roy
patent: 3700396 (1972-10-01), Adams
patent: 3752363 (1973-08-01), Fegley
patent: 3767339 (1973-10-01), Hunkar

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