Vacuum expression belt tracking and control apparatus for rotary

Details Vacuum expression belt tracking and control apparatus for rotary Vacuum expression belt tracking and control apparatus for rotary

1986-11-03

1988-04-12

Fisher, Richard V.

Liquid purification or separation

Automatic control

210386, 210402, 210404, 210DIG3, B01D 3306, B01D 3308

Patent

active

047372770

ABSTRACT:
A rotary drum vacuum filter suitable for processing pulp slurries is provided with a vacuum expression belt. The invention provides a method and apparatus for tracking and controlling the belt during operation. The belt is positioned by a moveable frame for expressing filtrate from the pulp web and in operation a control unit monitors lateral movement of the belt with respect to the drum. When drifting occurs the belt is adjusted horizontally during operation to counter drift. The adjustment can be repeated as necessary. If continued drift cannot be corrected then the belt is moved vertically to an inoperative position.

REFERENCES:
patent: Re19137 (1934-04-01), Wright et al.
patent: 3069921 (1962-12-01), Davis
patent: 3116244 (1963-12-01), Davis et al.
patent: 4077834 (1978-03-01), Stark
patent: 4177725 (1979-12-01), Gersbeck

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