Chipper Hammermill/Research Development
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The basic principle is straightforward. A hammermill is essentially a steel drum containing a vertical or horizontal rotating shaft or drum on which hammers are mounted. The hammers are free to swing on the ends of the cross, or fixed to the central rotor. 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 hammer bars and is thereby shredded and expelled through screens in the drum of a selected size.
Small grain hammermills can be operated on household current. Large automobile shredders can use one or more 2000 horsepower (1.5 MW) diesel engines to power the hammermill.(Taken from Wikipedia.)--Dennis 15:24, 12 March 2009 (UTC)
A screenless hammer mill uses air flow to separate flour from grain, is cheaper and easier to produce, and saves the long-term cost of replacing fragile drums/filters - See Amy Smith's photos & description of one. It is essentially a centrifugal fan/compressor, axis perpendicular to gravity, with a grain hopper feeding onto that axis opposite the motor, turning a lawnmower-like blade, and an outlet between the motor axis and the outer rim. Placing the outlet inwards from the rim prevents grit from being thrown out with the flour, as it would with a typical centrifugal fan design. However, having a closable outlet at the bottom allows some grit to be removed when needed.
Hammer Mill (HM) - it appears that CEB walls, wood rafters, and green roofs thrown on top of a roof by a hammer mill are a great method for building with 100% onsite material. Straw or branches are chopped by a hammer mill - and these have a strong ejection port that may throw such biomass on top of a roof to decompose into a green roof. The hammer mill may chop straw or newspaper for straw-clay insulation. The hammer mill is the great aid for any organic farming - with any type of compost chopped for facilitating decay. Critical to soil fertility if enhanced soil building is required. The hammer mill can also chop a large variety of other items, perhaps plastic for recycling. We are using one currently to make mulch for Organoponic Raised Bed Gardening and to mulch our orchard. May be applicable to mulching wood for making compressed wood gas.
Desert Harvesters: Mesquite trees represent one of the most promising forms of resilient, decentralized, and drought resistant food crops in the American Desert Southwest (and other arid climates). Desert Harvesters , a non-profit organization in Tucson, Arizona, is currently using a trailer-mounted hammer mill to facilitate decentralized mesquite bean processing (into highly nutritious mesquite flour) in southern Arizona. This organization may be an excellent partner for development of an open-source hammer mill, and their work demonstrates the value and potential for hammer mill deployment.
Analysis of Industry Standards
- 2 ton per hour hammer mill -