| 摘要 |
Bulk material is fed by a conveyor (10) into a hopper at the upper end of an upright extendible conduit (12). A fractionally opening gate (14) at the lower end of the conduit controls the rate at which the material in the conduit is discharged onto a discharge conveyor (15). Level sensors (13) detect the level of material in the hopper (18). A programmable logic controller (17) has its inputs connected to the sensors (13) and a belt weigher (11) associated with the conveyor (10), and controls the opening of the gate (14) to maintain a substantially full column of material in the conduit (12). The material discharged into the hopper (18) therefore moves slowly down the conduit in a controlled fashion, with minimal dust generation and product degradation.
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