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The first type of screw conveyor was the Archimedes' screw, used since ancient times to pump irrigation water. [ 1 ] 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 most commonly known screw press of this design is said to have been invented by famous Greek mathematician Archimedes and is known as the screw conveyor. The screw conveyor consists of a shaft, which is surrounded by a spiral steel plate, similar in design and appearance to a corkscrew. This design is used in a multitude of screw presses.
A screw conveyor uses a rotating helical screw blade to move bulk materials. Because of its self-locking property (see below) the screw is widely used in threaded fasteners to hold objects or materials together: the wood screw, sheet metal screw, stud, and bolt and nut.
The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
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6 Screw head diagrams. 2 comments. 7 Clutch head bit is not one way. 2 comments. 8 Mortorq. 2 comments. 9 triwing. 2 comments ...
ISO 5284:1986 Conveyor belts – List of equivalent terms; ISO 5288:2001 Synchronous belt drives - Vocabulary; ISO 5323:1984 Solid wood parquet and raw parquet blocks – Vocabulary; ISO 5329:1978 Solid wood paving blocks – Vocabulary; ISO 5344:2004 Electrodynamic vibration generating systems – Performance characteristics
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