REFINER PLATE CLEARANCE CONTROL SYSTEM

摘要

An automatic control system for maintaining a constant preset distance between the operating surfaces of reduction equipment such as a disc refiner including means for moving one of opposed refining surfaces to and from the other. The control system comprises a first feed-back device which produces a voltage related to the position of one refining surface and a second feed-back device producing a voltage related to the position of the opposed surface. Means are provided to combine these voltages and produce a composite signal representing the distance between the refining surfaces at any one instant during a refining operation. This composite signal is referenced to a pre-set signal having a value corresponding to the desired spacing between the refining surfaces. Means are provided whereby a difference in these signals produces an appropriately controlled movement of the one refining surface toward or from the other until the combined feed-back signal corresponds to the pre-set signal.