Power requirement of Screw Conveyors: The driving power of the loaded screw conveyor is given by: P = PH + PN + Pst Where, PH = Power necessary for the progress of the material PN = Driving power of the screw conveyor at no load Pst = Power requirement for the inclination of the conveyor Power necessary for the progress
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Design of Screw Conveyor: The size of screw conveyor depends on two factors 1. The capacity of the conveyor 2. The lump size of the material to be conveyed (Maximum dimensions of the particle) Usually there are three ranges of lump sizes which are considered for selection of screw size. These are: · A mixture of lumps and fines in
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Types of screw flight: The screw of the conveyor may be right hand or left hand, the right hand type being the usual design. The threads of the screw may be single, double or triple. The flight of the screws may be made in either of the two ways: 1. As Helicoids 2. As Sectional flight Helicoids Flight: They are
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Application of screw conveyors: Screw conveyors are employed for handling a great variety of materials which have relatively good flowability. Sticky and stingy materials are unsuitable for screw conveying. Screw conveyors have a few favourable points to its credit for recommending its application in different industries. Simplicity of design, easy construction and maintenance, are the few points which are often
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Screw Conveyors Screw conveyors were used as low height lift pump to irrigate the lands. It comprises of an inclined rotating casing with an internal helical screw thread, called flight. When such a casing is rotated with its lower end submerged in water, the water entrained in the pockets, formed by the pitches, is raised. The performance of such screws
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Conveyor Take-up Arrangement: All belt conveyors require the use of some form of take-up device for the following reasons: To ensure adequate tension of the belt leaving the drive pulley so as to avoid any slippage of the belt To ensure proper belt tension at the loading and other points along the conveyor To compensate for changes in belt length
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Pulley: The diameters of standard pulleys are: 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1400 and 1600 mm. pulley may be straight faced or crowned. The crown serves to keep the belt centered. The height of the crown is usually 0.5% of the pulley width, but not less than 4 mm. The pulley diameter Dp depends on the
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Types and Selection of Drives: Single Unsnubbed Bare / Lagged pulley Drive Snubbed Bare / Lagged Pulley Drive Tandem Drive Special Drives Single Unsnubbed Bare / Lagged Pulley Drive: This is the simplest drive arrangement consisting of a steel pulley connected to a motor and the belt wrapped round it on an arc of 180°. This can be used for
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Drive arrangement: In belt conveyors the driving power is transmitted to the belt by the driving pulley which is rotated by an electric motor. The basic mechanism of transmission of power from the pulley to the belt is based on the theory of friction drive. The fundamental equation for a belt conveyor drive is given by: (The Euler’s equation) T1
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Idlers: Conveyor belts are usually supported on idler rollers. In some cases they are supported by solid wood or runway of steel sheet or a combination support comprising of the two types of supports placed alternatively. There are two basic types of idlers: Carrying idlers Return idlers Carrying Idlers: The most commonly used type of carrying idlers used for handling
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