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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.
Fastenal Company is an American publicly traded company based in Winona, Minnesota, founded in 1967. It placed 479 in the 2021 Fortune 500 based on its 2020 revenues, [2] and its stock is a component of the Nasdaq 100 and S&P 500 stock market indices. Fastenal had 3,334 in-market locations as of March 2023. [3]
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.
The Winona County History Center, located in Winona, Minnesota, is made up of two buildings, the historic Winona Armory and the modern Laird Norton Addition.The Winona County Historical Society was established in 1935, and moved into the 1915 Winona Armory in 1973 and added the Laird Norton Addition in 2010.
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