| 摘要 |
PROBLEM TO BE SOLVED: To hold a hopper level to the specified quantity by dividing set cargo handling weight by the product of conveying speed of a belt feeder and opening area of a delivery port of a hopper to compute the actual bulk specific gravity of load, and controlling the accumulating quantity of the hopper on the basis of the actual bulk specific gravity. SOLUTION: A feeder measure VF a feeder speed sensor 48 for detecting the carry-out speed of a belt feeder is supplied to an actual bulk specific gravity computing part 51. The moving average of n-number part to bulk specific gravity obtained from the inputted feeder measure VF[m/h], preset opening area A[m<2> ] of a delivery port of a hopper, and set cargo handling weight Q* [T/h] set according to conveying capacity of a ground side conveyor is computed on the basis of YR=1/n×Q*/VF×AA, and supplied as actual bulk specific gravity YR[T/m] to a crossfeed measure control circuit 54. The crossfeed measure control circuit 54 makes the rotating speed and crossfeed speed of a sprocket and an excavating part coincide with the reference measure based on the actual bulk specific gravity YR.
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