| 摘要 |
<p>An apparatus for weighing bulk-material in the form of granules or dust, in which the bulk-material is delivered from a silo to a scale, through at least one conveyor pipeline, by means of a vacuum, the flow of material conveyed being reduced, for the purpose of metering, towards the end of the conveying procedure, by increasing the proportion of air, and the apparatus being designed in such a manner as to make accurate metering possible with high conveying capacity. To this end, provision is made, according to the invention, for a second conveyor pipeline which runs to the scale, which is not connected to the silo, and to which a changeover from the first conveyor pipeline is made towards the end of the weighing operation, air being drawn, in laminar flow, into the second conveyor pipeline and a storage-tank being provided, the latter containing a small amount of the material being conveyed and being provided in its lower part, with a mechanical conveyor adapted to be switched on by the scale towards the end of the weighing operation. The conveyor is in communication with the end of the second conveyor pipeline remote from the scale and simultaneously introduces the material contained in the storage-tank into the second conveyor pipeline.</p> |
