| 摘要 |
A hammermill (10) comprises a casing (12) having a longitudinal axis (18) and a sidewall (20) such that an enclosed grinding space (24) is defined within the casing. A rotor assembly (26) is situated within the casing for rotation about the axis, and includes hammer elements each having a radially outer tip (34) which defines a hammer rotation diameter. At least one grinding plate at the inside of the sidewall defines a grinding surface (38) in the grinding space having a radius of curvature centered on the axis, a length dimension parallel to the axis, and a width dimension defined by an arc about the axis. The grinding plate has a plurality of spaced apart edges such that each hammer tip (34) passes along the width dimension of the grinding plate with a clearance from the edges which defines a grinding gap. The sidewall other than at the grinding plate has a non-uniform curvature which defines a non-uniform clearance from the hammer rotation diameter that is greater than the grinding gap clearance. The non-uniform curvature includes at least one sidewall portion having a radius of curvature less than that of the grinding surface.
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