| 摘要 |
<p>A continuous-operation automated control system for a water scalping tank or like apparatus in which granular material of different sizes accumulates at varying rates at a series of classification stations; the material is discharged to at least one specification reblending flume, in predetermined ratios, to produce a specification product, and excess material is discharged to an auxiliary flume. One classification station is designated a master station. Discharge at each station is initiated whenever sufficient material has accumulated to allow a relatively constant flow. Each station has a digital timer for measuring its flow to the specification product; the time of flow for the master station is continuously compared with the flow time for each secondary station in a pre-set ratio that may be different for each secondary station. When the comparison for any secondary station shows excessive cumulative flow from that station, its discharge is diverted from the specification flume to the auxiliary flume, but only until the master station flow catches up. When the comparison for any secondary station shows an inadequate cumulative flow, the master station discharge is diverted to the auxiliary flume until the secondary stations have all caught up.</p> |
