Electronic controller of hydraulic pressure for journal loading of bowl

Abstract

An electronic system particularly suited for effecting control over the pressure of the hydraulic fluid through which the journal loading is established on the grinding rolls (20) of a bowl mill (10) of the type that is employed to pulverize coal. The subject electronic system is operatively connected in circuit relation to the belt feeder means (12), located externally of the bowl mill (10), that supplies to the bowl mill (10) the coal that is to be pulverized therein. In addition, the subject electronic system is also operatively connected in circuit relation to the hydraulic power unit (22) of the bowl mill (10) that provides hydraulic fluid under pressure to the grinding rolls (20). Accordingly, the subject electronic system is operative to monitor both the rate at which coal is fed to the bowl mill (10) and the pressure of the hydraulic fluid supplied to the grinding rolls (20) such that as the feed rate of the coal varies the hydraulic pressure being applied to the grinding rolls (20) can be made to vary so that the grinding forces that the grinding rolls (20) exert can be maintained substantially as an optimum regardless of the rate at which the coal is being fed to the bowl mill (10).