Hammer mill
A hammer mill is a machine whose purpose is to shred material into fine particles. They have many sorts of applications in many industries, including:
Ethanol plants (corn)
Grinding used shipping pallets for mulch
Sawmills (size reduction of trim scrap and planer shavings into boiler fuel or mulch)
A farm machine, which mills grain into coarse flour to be fed to livestock.
Shredding paper.
Milling grain.
Shredding scrap automobiles (see automotive shredder residue).
In waste management
The concept is fairly straightforward. A hammer mill is essentially a steel drum containing a vertical or horizontal cross-shaped rotor on which pivoting hammers are mounted. The hammers are free to swing on the ends of the cross. The rotor is spun at a high speed inside the drum while material is fed into a feed hopper. The material is impacted by the hammers on the ends of the rotating cross and thereby is shredded and expelled through screens in the drum.
Slow speed horizontal pallet grinderSmall grain hammer mills can be operated on household current. Large automobile shredders can use one or more 2000 horsepower (1.5 MW) diesel engines to power the hammer mill.
Wind mill
A windmill is a machine that is powered by the energy of the wind. It is designed to convert the energy of the wind into more useful forms using rotating blades or sails. The term also refers to the structure it is commonly built on. In much of Europe, windmills served originally to grind grain, though later applications included pumping water and, more recently, generation of electricity. Recent electricity-generating versions are referred to as wind turbines.
The most modern generations of windmills are more properly called wind turbines, or wind generators, and are primarily used to generate electricity. Modern windmills are designed to convert the energy of the wind into electricity. The largest wind turbines can generate up to 6MW of power (for comparison a modern fossil fuel power plant generates between 500 and 1,300MW).
With increasing environmental concern, and approaching limits to fossil fuel consumption, wind power has regained interest as a renewable energy source. It is increasingly becoming more useful and sufficient in providing energy for many areas of the world.
One area where turbines have become feasible is in the Midwestern United States, due to great amounts of wind.
The types of Hammer mill
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