Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1995-10-13
1996-12-24
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60413, 91363R, 91365, 164457, 1641542, F16D 3102
Patent
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.
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Tokyo Precision Instruments Co., Ltd., Nov., 1990 Document No. V511-890.
Lopez F. Daniel
Servo Kinetics
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