Screw Conveyors

Screw conveyors are bulk material transporting devices capable of handling a great variety of materials, which have relatively good flow ability. Flow ability denotes the degree of freedom of individual material particles to move past each other. The screw helix, mounted on a central pipe or shaft, rotates within a fixed trough to tube, pushes the material along the bottom and sides, shearing the material in the radical clearance between the helix and trough and causing the material to tumble upon itself as the moving face of the helical flight tends to lift the material.

The various applications of Screw Conveyors proceed naturally from two factors the characteristics of material to be conveyed and operating advantages peculiar to this type of conveyors.

Among many advantages of Screw Conveyors is feasibility of numerous feed and discharge opening is easily provided with regulating gate. Screw Conveyors likewise maybe used for unloading material from cars, bins, and piles often to initiate a material process. A typical application are grain storage, plants, feed mill, cereal processing plants and chemical plants. They are very adaptable to the volume control of material from bottom of bins, hoppers, bag dumps, storage piles. It is simple to arrange Screw Conveyor for the heating and cooling the material in transit by providing a jacket through out the trough.

In handling toxic material, Screw Conveyor lend themselves very well because of the enclosing trough can be made tight enough to contain toxic dust or vapours thus reducing personnel hazards. Conversely, materials that must be kept free from contamination are nicely handled.

Screw Conveyors mat be operated horizontally, inclined or vertically.