| 摘要 |
For control of a crushing plant to ensure both that a quota quantity of product is produced during each working period and that the product has optimum economic value by reason of small particle size, determination is made of the amount of product passed through the plant from the beginning of the period to each of a number of measurement times during the period. Each such determination gives a "still to go" quantity, hence a theoretical new feed rate to be maintained. The rate of feed of material into the plant is adjusted in correspondence with the ratio between that theoretical rate and the actual feed rate prevailing during an interval just before the measurement time. The crushing mechanism is controlled constantly to draw the full power available to it while it maintains output substantially in step with prevailing feed rate, such control being effected by adjusting crusher setting, apportioning feed material between crushers and/or controlling the relative portions of output material from a crusher that are respectively recirculated through that crusher and transferred elsewhere.
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