Screw Feeders are used to control the flow rate of free flowing, bulk material from a bin or hopper. The inlet section of the trough is designed to be filled at a high level. The screw under the inlet, and sometimes the trough as well, are modified to convey a metered amount of material per revolution of the screw. Modifications may include changes in the flighting diameter, pitch, pipe diameter, trough shape, etc.
Screws with a uniformed diameter and pitch will convey material from the rear of the inlet opening first. This can create flow issues with some materials because only a portion of the inlet is actually used so the bin or hopper doesn't discharge evenly.
All of the single screw variations are also available as twins. This increases capacity and allows for wider inlets and discharges which often improves performance for less free flowing materials. Multi Screw Conveyors are used as screw feeders and may consist of twin, triple, or quadruple screws, side by side. They provide a means of moving a wide variety of material from bins or hoppers at a constant and controlled rate of flow.
Screw feeders are available in a variety of types to suit specific materials and applications. Get in touch so a representative can help you determine the best solution for your application.
National Screw Conveyor is one of the largest custom screw conveyor manufacturers in Southern Africa. Our screw conveyor systems are available in a wide variety of materials resistant to corrosion, abrasion, and heat. We offer conveyors for use in horizontal, inclined, and vertical applications. Our screw conveyor systems are designed to meet and surpass all application requirements.