Importance

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Abstract

Suction device for obtaining dust samples of nearly homogeneous grain sizes and with a reproducible bulk density for the analysis of ores. The device, which is suitable for use during the mining of ores, includes a cylindrical casing, having an opening at each end thereof, and a cylindrical sieve insert, having an opening at each end thereof and being coaxially located within the casing. An inwardly-facing conically-shaped insert, located at the front end of said casing, provides flow communication between the front end of the casing and the sieve insert. A suction pipe socket is located laterally on the casing for attachment to suction-generating equipment. A filter is located over the mouth of the conically-shaped insert. The front end of a downwardly-curved dust-conducting tube is in direct communication with the back end of the sieve insert. There is a tube for collecting samples from the dust-conducting tube. The nozzle-like taper of the conically-shaped insert accelerates the dust particles which have been drawn into the device and have passed through the filter. The smaller dust particles, following the deflection of the air flow caused by the lateral suction through the suction pipe socket pass through the sieve insert and out the suction pipe socket. The larger dust particles, not being deflected by the lateral suction, pass through the dust-conducting tube into the sample container.

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First Claim