Archimedes screw pump

Archimedes screw pump dispensing utilizes an Archimedes screw to push the adhesive or solder paste out of a nozzle (see Fig. 40.18.) The speed and duration of a turn, as well as the size of the opening, determine the quantity of adhesive or paste deposited on the site. As in the case of the time-pressure technique, different deposit quantities can be realized by multiple spindle (heads) or a computer program that alters the screw speed or turn duration to change the amount of material dispensed from the same orifice. All other considerations with respect to the roles of adhesive or solder paste viscosity and shelf-life also apply to this technique. 

FIGURE 40.18 Archimedes screw pump dispensing technique (a) The dispenser is lowered to above the circuit board surface (b) the Archimedes screw is turned a set rotation (Ax), pushing adhesive out of the nozzle (c) the dispenser is lifted from the circuit board. 

Archimedes mechanical skill, together with his theoretical knowledge, enabled him to construct many ingenious machines. During his time in Egypt, he invented a hand-cranked manual pump, known as Archimedes screw, that is still used in many parts of the world. Its open structure is capable of lifting fluids even if they contain large amounts of debris. 

Extrusion is a continuous process in which an Archimedes screw, rotating within a heated barrel, melts and pumps the polymer through dies to form continuous shapes such as pipes, profiles or sheets. In addition, extrusion is the basic element in a number of other polymer processing operations. The plastication and pumping functions... 

Waters, S., Aggidis, G. A. (2015). Over 2000 years in review Revival of the Archimedes screw from pump to turbine. Renewable and Sustainable Energy Reviews, 51, 497-505. 

Pumps, Archimedes screw c/s with 38° inclination with shaft and flights, upper and lower bearing mounts, V belt drive and TEFC motor excluding concrete channel and influent and effluent basins. FOB cost 160 000 at drive power = 10 kW with n = 0.58 for the range 0.6-100. L+M = 1.7-2.1. L/M = 0.3-0.41. 

The scroll is an Archimedes screw that moves slack wax from the outer ends of the filter to a center pipe. The slack wax falls down the pipe and may either proceed down a slide where it may be combined with slack wax from other filters into a slack wax drum or into a wax boot or vessel. This is a small drum dedicated to the filter. From the large wax drum or the wax boot the slack wax is pumped to either wax recovery, the second stage of dewaxing or deoiling depending on the plant configuration. 

Archimedes of Syracuse (287-212 bc) Greek mathematician, who spent most of his life at his birthplace working on levers and other aspects of mechanics, in hydrostatics he devised a pump (the Archlmedlan screw) and formulated Archimedes principle. His method of successive approximation allowed him to determine the value of re to a good approximation and some of his work came close to anticipating integral calculus. He was killed by a soldier in the Roman siege of Syracuse. 

The Vacuum Pump is working with a pair of Archimedes type screw rotors. 

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