Apparatus for the uniform dosage of granular blasting agents in pneumatical blasting machines
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United States of America Patent
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-
Nov 20, 1990
Issued Date -
N/A
app pub date -
Nov 1, 1988
filing date -
Sep 20, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for the uniform proportioning of granular blasting agents in pneumatically operating blasting machines is disclosed in which the blasting agent supply is in a closed hopper with a blasting agent feed controlled with regard to the amount of agent fed per unit of time. A screw conveyor screw disposed in a horizontal screw conveyor tube having an entry area adjacent to the discharge area, which is in turn adjacent to a removal duct of the conveyor screw tube has substantially the same cross section diameter value of a blast-air duct. The blast-air duct forms a tee with the screw tube in the discharge area. To compensate for the pressure drop in the device during its operation, a connecting duct is provided between the blast-air duct and the closed hopper. The branching of the connecting duct to the blast-air duct lies upstream from the entrance to the screw conveyor tube.
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