Hydraulic closed loop control system

Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy

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60413, 91363R, 91365, 164457, 1641542, F16D 3102

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active

055864350

ABSTRACT:
A closed loop hydraulic system especially adapted as a shot control system for a die casting machine. The control system includes a voice coil driven pilot servo valve mounted to a high flow proportional valve. The control system provides a highly controllable restriction of the outflow of hydraulic fluid from a hydraulic shot cylinder which drives a shot plunger of a die casting machine. Position transducers are provided for the pilot servo valve, proportional spool valve, and shot cylinder and a control system monitors these inputs to provide closed loop control over the shot process. A hydraulic accumulator is located in each of the pressure source and return lines of the pilot servo valve and a hydraulic accumulator tank is mounted directly to the proportional valve. The configuration of the elements of the control system along with features intended to optimize the hydraulic circuits provide a die cast shot control system with exceptionally high repeatability, frequency response and controllability coupled with low maintenance characteristics.

REFERENCES:
patent: 2290479 (1942-07-01), Mercier
patent: 4022269 (1977-05-01), Segawa
patent: 4204461 (1980-05-01), Gratzmuller
patent: 4252176 (1981-02-01), Page
patent: 4321435 (1982-03-01), Grieger et al.
patent: 4669265 (1987-06-01), Gratzmuller
patent: 4938118 (1990-07-01), Wolfes et al.
patent: 5060475 (1991-10-01), Latimer
Metals Handbook, 9th Ed. Ohio, ASM International, 1988, vol. 15, p. 789, TH 472 A3 9th ed V15 c3.
Fluid Power, 3rd Ed. Indianapolis, Bobbs-Merrill Educational Publishing, 1980, pp. 442-446.
Tokyo Precision Instruments Co., Ltd., Nov., 1990 Document No. V511-890.

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