| 摘要 |
<p>A control device for a ball mill includes sensing means to determine and signal the number of revolutions of the mill, the signals from the sensing means being passed to a preset counter and control assembly which when a predetermined number of driven revolutions has been counted deactuates the drive and counts the decelerating free-wheeling revolutions so that just before the mill stops rotating a brake can be applied to stop it and hold it with its discharge port in a predetermined position.</p> |
