Figure 8-14.-Typical batch plant cumulative scale settings and cycle.is screened into different sizes and stored by size inseparate bins.From the hot bins the aggregates are deposited intoa weigh-hopper. Coarse aggregates are usually the firstto be deposited into the weigh-hopper, theintermediate-size aggregates next, and the fineaggregates last. This sequence is designed to place thefines of the aggregates at the top of the aggregatesdeposited in the weigh-hopper where they cannot leakout through the gate at the bottom of the weigh-hopper,This system also allows the most efficient utilization ofthe available volume in the weigh-hopper. Theweigh-hopper is suspended from scale beams and thescales indicate the weight of the full amount ofaggregate entering the hopper.When each size of aggregate is deposited into theweigh-hopper, the weights to be drawn from the hot binsare marked on the scale dial. Because the scales indicatethe weights cumulatively, the dial must be markedaccordingly. Figure 8-14 shows how the cumulativescale settings are used to control the proportion ofaggregates drawn from each bin.8-13
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