| 摘要 |
A pump for concrete or other moist flowable material containing aggregate, including a hopper, a pair of alternately stroking pump assemblies below the hopper for forcing concrete via a junction valve into a common output line, and a loading system for alternately charging the two pump assemblies with concrete from the hopper. The loading system includes a conveyor and a pair of generally vertical charging chambers having lower outlet ports communicating with inlet openings in the respective pump assemblies, and upper portions extending into the hopper through the lower hopper wall and terminating upwardly in open tops disposed above the highest possible level of concrete in the hopper. The open top of each charging chamber is sealed by a latchable closure valve during the pumping stroke of its associated pump assembly, and is open during the return stroke to permit concrete, continuously delivered by the conveyor from the hopper, to replenish the charging chamber as the latter in turn fills its pump assembly preparatory to the next pumping stroke. The conveyor includes a vertically oriented disk mounted for continuous driven rotation about a horizontal shaft extending transversely across the upper portion of the hopper. The disk carries a number of angularly spaced scoop buckets on each of its opposite faces, and the buckets in the lower portion of the disk scoop concrete from the hopper. At or near their uppermost travel the buckets dump their contents onto inclined chutes which deliver the concrete to the tops of the charging chambers, thus refilling whichever of the chambers is open at any given time. The buckets may be fixed to the disk or, in an alternate form of the invention, may be pivotally mounted thereon, being permitted limited angular movement during disk rotation.
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