| 摘要 |
A rock picker in the form of a wheeled vehicle for travel over a field that has rocks scattered superficially and/or near superficially therein, comprises a wheeled chassis that supports two coacting, endless chain conveyors of draper chain type having their working runs in confronting relationship and widths extending transversely of the chassis. One of the conveyors is elongate and disposed below the other, which is relatively short. The short upper conveyor has its working run of widespread, substantially V configuration, with the vertex of the V extending transversely of the lower conveyor at or near its lower end, which is disposed at or near ground level, thus forming entry and exit bights therewith. The forward, entry bight receives rocks lifted thereinto by a scraper blade, which is mounted on the frame immediately in advance of the conveyors as a ramp leading substantially smoothly into the throat between the two conveyors. The short upper conveyor is mounted freely for up and down movement as rocks are received by the entry bight and are conveyed through the throat and upwardly by means of the lower conveyor, which slopes upwardly from front to rear of the chassis. Means are preferably provided intermediate the length of the lower conveyor for preventing roll-back of rocks being conveyed upwardly, and a receiving dump vessel is preferably provided for catching and collecting rocks discharged from the upper end of the lower conveyor. Screening means, e.g. a series of powered screening rollers, is preferably interposed between the scraper blade and the lower conveyor within the entry bight as an extension of the ramp for screening out earth and pebbles accompanying the rocks.
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