초록 ▼

A gravimetric metering apparatus with a constant throughput is enclosed inside a sealed chamber and connected through the wall of the chamber, by a first pipe, to a pneumatic conveyor line operating under a pressure of n bars and, by a second pipe, to an intermittentently operated external loading h

A gravimetric metering apparatus with a constant throughput is enclosed inside a sealed chamber and connected through the wall of the chamber, by a first pipe, to a pneumatic conveyor line operating under a pressure of n bars and, by a second pipe, to an intermittentently operated external loading hopper. The chamber is filled with gas under a pressure of n bars which is equal to that inside the pneumatic conveyor line.

대표청구항 ▼

A device for supplying a powdery product in gravimetrically metered amounts and with a controlled throughput to a pneumatic conveyor line, comprising: (a) a gravimetric metering apparatus, having a hopper for holding the product to be supplied and which is, in use, closed at its upper end, and an ex

A device for supplying a powdery product in gravimetrically metered amounts and with a controlled throughput to a pneumatic conveyor line, comprising: (a) a gravimetric metering apparatus, having a hopper for holding the product to be supplied and which is, in use, closed at its upper end, and an extractor-discharger belt with a highly sensitive weighing device and a control element containing a micro-processor to regulate the speed of the extractor belt, in order to supply said product to said pneumatic conveyor line which operates under a pressure of n bars; (b) a sealed chamber which contains said gravimetric metering apparatus in its entirety, with a first pipe going through the wall of the chamber for connecting the extractor-discharger to the pneumatic conveyor line and having a branch which emerges inside said hopper, and a second pipe going through the wall of the chamber for connecting the hopper of the gravimetric metering apparatus to an external loading hopper; and (c) means for creating and regulating a gas pressure inside the sealed chamber at a value of n bars which is equal to the pressure inside the pneumatic conveyor line, said means comprising a differential pressure sensor mounted on said first pipe branch and capable of detecting the difference in pressure between the pneumatic conveyor line and the chamber; a means for allowing gas to enter inside the chamber; and a means for allowing gas to escape outside the chamber, said two latter means being opeated by the differential pressure sensor.