Hammermill

A hammermill comprising:

• a housing having an inlet end, a discharge end, a sidewall extending between the inlet end and the discharge end, and a longitudinal axis, the sidewall of the housing defining an enclosed work space;
• a rotor assembly disposed within the housing for rotation about the longitudinal axis of the housing;
• a first plurality of hammers coupled to the rotor assembly and disposed in the enclosed work space;
• and
• a first attrition plate assembly having a generally circular configuration secured to the sidewall within the enclosed work space of the housing, the first attrition plate assembly arranged such that at least a portion of each hammer of the first plurality of hammers is spaced from and overlies a portion of the first attrition plate assembly.

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 an adjoining secondary 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, and 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 both the primary and secondary reduction chambers, respectively;
• and
• 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 are spaced from and overlie a portion of the attrition plate assembly.

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 an adjoining secondary 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 defines an enclosed work space, and 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 both the primary and secondary reduction chambers, respectively;
• and
• a plurality of adjoining attrition impact plates secured to the sidewall within the primary and secondary reduction chambers, respectively, each attrition impact plate having a grinding surface, the attrition impact plates arranged such that the hammers are spaced from and overlie a portion of the grinding surface of the attrition impact plates,
• wherein at least two adjoining attrition impact plates defines a substantially continuous work surface within the secondary reduction chamber, the continuous work surface having a generally cylindrical shape that encloses the hammers disposed in the secondary reduction chamber,
• whereby the hammers and the attrition impact plates cooperate to urge particulate material toward the discharge end of the housing.