Importance

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Abstract

A more efficient hammermill is provided. The upper cutting plates located near the inlet at the top of the hammermill has a double radiused profile which increases the steepness of the angle between the hammer and the upper radiused segment of the cutting plate. As material is flung off the hammer, it impacts the more steeply angled upper radiused segment of the cutting plate. The upper radiused segment also provides a progressively tighter radius for the entering material and facilitates the finer reduction that occurs as a result of the closer clearance between the hammer tips and the lower radiused segment. The axis of the rotor is offset generally vertically toward the inlet of the hammermill. This places the hammer tips closer to the top of the working chamber, resulting in enhanced particle reduction in the primary destruction zone, thus increasing capacity of the hammermill. Finally, a plurality of classification zones are provided defined by convex cutting plates and screens. Because of the vertically offset rotor, the clearance between the hammer tips and the screens is increased, allowing for a deceleration of particles flowing along the screens which increases the differential in speed between the hammers and the particles. The cutting plates extend into the grinding chamber thus reducing the tolerance between the surface of the cutting plate and the hammer tip resulting in disruption of particle flow, causing the particles to be flung upwardly into the path of the hammers where the impact force is made greater due to the slowed acceleration of the particles. The material that is not removed through the next screen encounters another cutting plate where the process is repeated.

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First Claim