Grinding mill control using controlled pulsing of air clutches

Details Grinding mill control using controlled pulsing of air clutches Grinding mill control using controlled pulsing of air clutches

1982-12-09

1985-06-04

Krizmanich, George H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 0098, 192 871, 74661, B60K 4102, F16H 3706

Patent

active

045209103

ABSTRACT:
There is provided a control apparatus for stopping a large grinding mill driven by two synchronous motors coupled to the mill through respective air clutches. The control includes a clutch actuator control which applies a predetermined amount of pressure of predetermined duration to the clutches sufficient to at least partially close the clutches but insufficient to fully close and lock-up the clutches. The control apparatus further includes an enable control which periodically enables the clutch actuator control to apply the predetermined amount of pressure. The enable control enables the clutch actuator control for a predetermined time duration sufficient to stop motion of the mill and synchronous motors. The present invention provides a system for bringing a mill to a stop relatively quickly without adding significant costs to the mill controls.

REFERENCES:
patent: 3127790 (1964-04-01), Howey
patent: 3757912 (1973-09-01), Ball et al.
patent: 4298113 (1981-09-01), Shaver et al.
patent: 4377222 (1983-03-01), Sommer

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