Patent ID: 7243868
Filing Date: 2007-07-17
Classification: B02C

Abstract:
1. A hammermill comprising: a housing having an inlet end, a discharge end, a sidewall extending between the inlet end and the discharge end, a longitudinal axis, a primary reduction chamber, and a secondary reduction chamber adjoining the primary reduction chamber, the sidewall proximate the inlet end of the housing defining an inlet opening, wherein, in the secondary reduction chamber, the sidewall of the housing defining an enclosed work space, wherein, in the primary reduction chamber, the sidewall and the inlet opening define a partially enclosed work space; a rotor assembly disposed within the housing for rotation about the longitudinal axis of the housing; a plurality of hammers coupled to the rotor assembly and disposed in the primary and secondary reduction chambers, respectively, each hammer of the plurality of hammers comprising: an attrition plate assembly secured to the sidewall within the primary and secondary reduction chambers, respectively, the attrition plate assembly arranged such that the hammers disposed in the primary and secondary reduction chambers are spaced from and overlie a portion of the attrition plate assembly.