Apparatus for controlling the operation of injection molding mac

Details Apparatus for controlling the operation of injection molding mac Apparatus for controlling the operation of injection molding mac

1975-04-18

1976-04-20

Jenkins, Robert W.

Plastic article or earthenware shaping or treating: apparatus

Projection

425145, B29B 106

Patent

active

039513882

ABSTRACT:
An injection molding machine wherein a screw rotates and reciprocates in a barrel to plasticize granular synthetic material and to expel plasticized material into a mold. The screw is reciprocated by the piston of a hydraulic cylinder one chamber of which is connected with the outlet of a first pressure relief valve which determines the pressures of fluid while the screw moves forwardly to expel plasticized material, and with the inlet of a second pressure relief valve which determines the pressure of fluid while the screw moves rearwardly during plastification of granular material. The pressure relief valves are controlled by a pressure selecting valve which, in turn, is controlled by a programming unit. The inlet of the first pressure relief valve is connected directly with a line for highly pressurized fluid, and the outlet of the second pressure relief valve is connected with the tank. A fluid flow regulating valve controls the flow of hydraulic fluid from the high pressure line to the control ports of the pressure relief valves and to one port of the pressure selecting valve. Another port of the latter valve is connected with the tank.

REFERENCES:
patent: 3317962 (1967-05-01), Morse
patent: 3693946 (1972-09-01), Merritt
patent: 3728053 (1973-04-01), Stillhard
patent: 3797808 (1974-03-01), Peter
patent: 3822057 (1974-07-01), Wheeler
patent: 3822867 (1974-07-01), Evans

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