초록 ▼

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 p

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.

대표청구항 ▼

A method of controlling operation of a crushing plant having a crushing mechanism (7 and 8) for which a predetermined amount of power is constantly available, means (14) for feeding raw material to the crushing mechanism (7 and 8) at a controllably variable feed rate, and a delivery zone (9) to whic

A method of controlling operation of a crushing plant having a crushing mechanism (7 and 8) for which a predetermined amount of power is constantly available, means (14) for feeding raw material to the crushing mechanism (7 and 8) at a controllably variable feed rate, and a delivery zone (9) to which product material of less than a predetermined particle size is delivered, said method enabling a predetermined quantity of product material to be delivered to the delivery zone (9) during a predetermined working period while also ensuring that the product material delivered to said zone (9) during said period is of optimum economic value by reason of having the smallest particle size attainable within the constraints imposed by said predetermined quantity and the available power, said method being characterized by: A. at each of a plurality of measurement times during the working period (1) ascertaining the quantity of material that has been delivered to the delivery zone (9) from the beginning of the working period to the measurement time, and (2) by reference to (a) the amount of material that still needs to be delivered to the delivery zone (9) to make up said predetermined quantity, (b) the time remaining from the measurement time to the end of the working period, and (c) the rate at which raw material was being fed to the crushing mechanism (7,8) during an interval immediately preceding the measurement time, adjusting the rate of feed (at 14) of raw material to the crushing mechanism (7,8) to a value which, if maintained to the end of the working period, is calculated to cause said predetermined quantity of material to have arrived at the delivery zone (9) by the end of the working period; and B. at all times so controlling the crushing mechanism (7,8) as to cause it to consume the full amount of power available to it while it continues to process material at substantially the prevailing feed rate.