Synergetic automatic control system for pellet mill

Details Synergetic automatic control system for pellet mill Synergetic automatic control system for pellet mill

1989-01-12

1991-06-04

MacDonald, Allen R.

Boots, shoes, and leggings

364468, 426454, 241 34, G06F 1500

Patent

active

050219405

ABSTRACT:
An apparatus and method for automatically controlling a pellet mill. Dry material from a feeder and steam from a valve are supplied to a conditioner, in which the dry material is mixed with the steam to form a hot and moist conditioned mash. The mash is fed into a motorized die or other pellet producing means. During operation, the current load of the die motor and the temperature in the pellet mill are continuously monitored. At period intervals, the system determines whether the current is within a certain tolerance of a predetermined target value. If the current is not within tolerance, the rate of input of raw material is increased or decreased. For each such change in input of raw material, an adjustment is made to the amount of steam input. If the current is within tolerance, the system determines whether temperature of the conditoned mash is near a predetermined target value, and if not, the system adjusts the steam input. The system also monitors the effects of preceding adjustments to predict and prevent a plugged die.

REFERENCES:
patent: 3932736 (1976-01-01), Zarow et al.
patent: 4327871 (1982-04-01), Larsen
patent: 4340937 (1982-07-01), Volk, Jr.
patent: 4463430 (1984-07-01), Volk, Jr. et al.
patent: 4700310 (1987-10-01), Volk, Jr.
patent: 4721448 (1988-01-01), Irish et al.
patent: 4742463 (1988-05-01), Volk, Jr.
patent: 4764874 (1988-08-01), Volk, Jr.
patent: 4786182 (1988-11-01), Larsen

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