Dispensing – Automatic control – Constant weight – volume or pressure control by output
Patent
1983-05-25
1986-04-08
Rolla, Joseph J.
Dispensing
Automatic control
Constant weight, volume or pressure control by output
222 63, 222 64, 222 71, 222 77, 222504, 198505, 177 16, 177122, B67D 508
Patent
active
045806985
ABSTRACT:
A gate-type feeder control system has level and weight sensors for monitoring the output of the system to a conveyor or other receiver, an electronic control circuit responsive to the sensors, and a hydraulic actuator circuit including a plurality of valves to provide the desired output of a feeder gate. In the electronic circuit, a master set point signal is entered and compared with the output signal from the sensors. The output flow to the receiver of the system is continuously adjusted by a deviation controller to reduce the deviation in these two signals. Erratic changes in system output are avoided by a deadband circuit introduced into the electronic circuitry to buffer excessive oscillation, overresponse and even instability caused by transient size change and lumping associated with bulk materials. The electronic circuit also includes an averaging module to average the level/weight of the material being discharged to obviate responding to peak levels. Finally, utilization of stepped sequencing and time delay of the solenoid valves also maintains a more accurate profile on the belt while minimizing shock. In the hydraulic circuit, power for opening and closing the feeder gate is provided through the use of power cylinders with pressurized fluid being supplied by a compensating, variable volume pump.
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Curtis Mark T.
Finke David L.
Ladt Max A.
Jones Andrew
Pebco, Inc.
Rolla Joseph J.
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