| 摘要 |
In apparatus for dosaging bulk material in a pneumatic conveying stream the dosaging is effected by means of an apertured disc having an annular array of through holes of small diameter which, as the disc rotates about an axis, transfer discrete quantities of bulk material from a column thereof in a supply container to a pneumatic conveying conduit through which the apertured portion of the disc passes between sealing rings which act as stripping elements. The disc is located coaxially within the supply container and driven by a motor whose speed is adjustable to allow the dosaging quantity to be varied. The conveying conduit is taken through the supply container and interrupted at the position of the apertured disc where the conduit is provided with the sealing elements. The bulk material is fluidized by air drawn in through the bottom of the container and extracted through the top by means of a fan which supplies the conveying air to the conduit. The disc has large apertures, which allow the bulk material to pass through it, radially inwardly of the annular array of small holes.
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