Screw conveyors
Screw Conveyors
A screw conveyor is a mechanism that uses a rotating helical screw, called “flighting”, that is installed within a tube or trough, to move liquid or granular materials. They are used in many bulk handling industries.
Types of Screw Conveyors
- Horizontal screw conveyors
- Inclined screw conveyors
- Shaftless screw conveyors
- Vertical screw conveyors
Horizontal Screw Conveyors
Horizontal screw conveyors are the most widely used type of screw conveyor. Used to convey bulk materials from one part of a process to another, horizontal screw conveyors are available in a wide range of sizes, lengths, configurations and materials of construction. Screw conveyors are typically designed to convey bulk materials at 15, 30 or 45-percent trough loading, depending upon material characteristics of the specific bulk material. As a general rule, trough loading of 45-percent can be used for light, free-flowing and non-abrasive bulk materials. Trough loadings of 15 and 30-percent are typically used for denser, sluggish and more abrasive bulk materials. The inlet of a screw conveyor is always control fed by another device such as Screw Conveyor, Screw Feeder, Belt Conveyor, Rotary Airlock, Volumetric or Gravimetric Feeder.
Inclined Screw Conveyors
Inclined screw conveyors typically operate from slightly above the horizontal position to 45-degrees from the horizontal position. Above 45-degrees an inclined screw conveyor is considered a vertical screw conveyor. As the degree of incline increases, conveying efficiency is reduced and horsepower requirements increase due to the effects of gravity and bulk material fall back. Conveying efficiency is affected by angle of incline, characteristics of the specific bulk material, type of screw conveyor trough and screw pitch. Gkindus recommends designing screw conveyors using the lowest possible degree of incline for maximum efficiency.
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Shaftless Screw Conveyors
Bulk materials discharged from centrifuges, filter presses or mixers can easily be conveyed using a Shaftless Screw Conveyor. Our shaftless design provides a non-clogging conveying surface that allows difficult-to-convey materials to become easy-to-convey. The perfect solution for handling bulk materials with high moisture content is the Shaftless Screw Conveyor.
Vertical Screw Conveyors
Vertical screw conveyors are a very efficient method for elevating a variety of bulk materials at very steep inclines or completely vertical. Any screw conveyor located on an incline over 45-degrees to be a vertical screw conveyor. The compact design allows for the vertical screw conveyor to fit into almost any plant layout. With a minimum number of moving parts, the vertical screw conveyor is a cost-effective and dependable component of any bulk material handling process.
