PULVERULENT MATERIAL CONVEYING APPARATUS

摘要

A pulverulent material conveying apparatus which includes a hollow barrel having an inlet which is adapted to be connected to a source of pulverulent material and an outlet for discharging material into a manifold chamber. A screw conveyor is rotatably mounted in the barrel for advancing the material through the barrel. Each end of the screw is mounted in bearings. The end of the screw near the outlet of the barrel is tapered so that the pulverulent material is compressed to form a fluid seal at the outlet of the barrel. A check valve is slideably mounted on the screw shaft to restrict the flow of material from the barrel into the manifold chamber. Air under pressure is supplied to the manifold chamber where it aerates the pulverulent material and entrains the material to the outlet of the manifold chamber and the conveying line. The outlet of the manifold chamber is coaxial with the barrel, and the air under pressure is supplied to the manifold chamber so that a substantially complete circle of air under pressure is formed around the outlet of the barrel.