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screw conveyor(auger conveyor)is a mechanism that uses a rotating helicalscrewblade, called a flighting, usually within a tube, to move liquid or granular materials. They are used in many bulk handling industries. Screw conveyors in modern industry are often used horizontally or at a slight incline as an efficient way to move semi-solid materials, including food waste, wood chips, aggregates, cereal grains, animal feed, boiler ash, meat and bone meal, municipal solid waste, and many others.
they usually consist of a trough or tube containing either a spiral blade coiled around a shaft, driven at one end and held at the other, or a shaftless spiral, driven at one end and free at the other. The rate of volume transfer is proportional to the rotation rate of the shaft. In industrial control applications the device is often used as avariable rate feederby varying the rotation rate of the shaft to deliver a measured rate or quantity of material into a process.
it consists of endless chains or belts to which are attached buckets to convey bulk material in horizontal, inclined, and vertical paths. The buckets remain in carrying position until they are tipped to discharge the material. Various discharging mechanisms are available.
its main use is to carry difficult materials at slow speed. Early elevators useda flat chain with small, steelbucketsattached every few inches.
they operate at high speeds which throw the materials out of thebucketsinto the discharge throats by centrifugal force. Thebucketsare loaded on either the up or down leg side of the boot sections, and thebucketsfrequently dig through the material during loading.
