Hydraulic closed loop control system

Details Hydraulic closed loop control system Hydraulic closed loop control system

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/043 (2006.01) B22D 17/32 (2006.01)

Patent

CA 2127744

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. 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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