Dispensing – Automatic control – Constant weight – volume or pressure control by output
Patent
1981-05-21
1983-12-27
Tollberg, Stanley H.
Dispensing
Automatic control
Constant weight, volume or pressure control by output
222625, A01C 1518
Patent
active
044225628
ABSTRACT:
Ground control system for use with a spreader of dry bulk material at a predetermined rate and speed. The spreader mounts on a vehicle or like structure. The ground control system has input variables of travel rate of the vehicle and conveyor rate of the conveyor running through the spreader, and an output signal for controlling height of a feedgate movable at an exit port of the spreader. The travel rate input signal includes sensing the speed of the vehicle and accounts for calibration signals dependent on vehicle components such as tire sizes and other constants, and includes variable inputs such as the swath width and the application rate of spreading. The conveyor speed input signal includes the speed of the conveyor, predetermined constants such as conveyor width, gear ratio, etc., and input variables including the density of the material and the weight of the material. The input signals are differentiated for controlling the servo coupled to the feedgate. A feedback signal from the feedgate connects to the conveyor input circuit. The servo control signal to the feedgate can be pulse modulated for optimum control of the opening and closing speed of the feedgate. The pulse rate of the pulse modulation can also be adjustable. The system provides for the saving of energy.
REFERENCES:
patent: 3668560 (1972-06-01), Padalino et al.
patent: 3677540 (1972-07-01), Weiss
patent: 3679098 (1972-07-01), Weiss
patent: 3700987 (1972-10-01), Deering
patent: 4277022 (1981-07-01), Holdsworth et al.
Jaeger Hugh D.
Rawson Control Systems Inc.
Tollberg Stanley H.
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