Screw Conveyor

GENERAL INTRODCTION

Industrial screw conveyors or auger conveyors move bulk material such as granular solids (powder, grain, granules), semi-solids, liquids, and non-flowing material from point to point. Typical materials transferred in screw conveyors are cereals, fertilizers, animal feeds, ash, gravel, cement, and solid wastes. They drastically increase productivity, reducing the manual labor required to move the material from one point to another.  A screw conveyor consists of a rotating screw shaft installed in a trough. As the screw shaft rotates, the material is moved linearly, either horizontally, vertically, or on an inclined path.  The food and grain industries and aggregate mining industries use screw conveyors extensively. They are versatile and can be designed to meet the unique needs of many conveying systems.
A key component in designing industrial screw conveyors is determining the flow of the material, which can be either pulled or pushed. In this article, we walk you through key recommendations from one of IBT’s top suppliers, KWS, to help you determine where your drive unit should be located.

Features:

Simple Structure: The screw conveyor has a relatively simple structure, mainly composed of motors, screw shafts, and screw blades, making it easy to manufacture and maintain.
Good Sealing Performance: Due to the good sealing performance of the screw conveyor, it can prevent materials from scattering or flying during the conveying process, reducing material loss and pollution.
Easy to Operate: The screw conveyor is easy to operate and can be used to transport materials by controlling the motor, making it easy to master.
Easy Maintenance: The components of the screw conveyor are relatively simple, making maintenance easier and reducing maintenance costs.
Convenient Closed Transportation: Screw conveyors can adapt to various types of materials and can be transported with different equipment, such as closed belt conveyors, bucket elevators, etc., to facilitate closed transportation.

Working Principle

The main components of the screw conveyor include: driving device, end bearing seat, screw shaft, screw blade, end feeding port, middle feeding port, intermediate bearing seat, head bearing seat, middle discharge port, head discharge port, machine slot etc.
When screw conveyor works, the screw shaft rotates, and the material moves forward along the trough bottom of the conveyor under the push of the blade. Because of the gravity of the material and the friction between the material and the groove wall, the material does not rotate with the blade of the screw conveyor. The transportation of materials in the conveyor is a kind of taxiing.

2. Horizontal Screw Conveyor

When the material is added to the fixed machine slot, due to the gravity of the material and the friction between the machine slot and the machine slot, the material accumulated in the lower part of the machine slot does not rotate with the spiral body, but only moves forward driven by the rotating spiral blade.
The horizontal screw conveyor is convenient for multi-point loading and unloading, and mixing, stirring or cooling can be completed at the same time in the conveying process. It is suitable for continuous and uniform transportation of loose materials with horizontal or small inclination angle, the working environment temperature is -20—+40℃, and the conveying material temperature is -20—+80℃.
The rotational speed of the horizontal screw conveyor is lower than that of the vertical conveyor, and the conveying distance is ≤ 70m.

5. Bendable Screw Conveyor

The screw shaft of the bendable screw conveyor is bendable , so the conveying line can be arranged according to the space curve according to the need. This screw conveyor can be used not only for straight-line conveying but also for bending conveying, and this high degree of flexibility makes it very convenient for users to arrange all kinds of equipment.
A single bendable screw conveyor can transport materials with a vertical height of up to 10 meters and a horizontal distance of up to 25 meters. If necessary, multiple conveyors can be connected in series, which can be transported farther and higher distance.