Importance

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Abstract

An impeller is disclosed for use in a centrifugal impact rock crusher. The crusher includes a cylindrical housing and an impact surface positioned radially around the housing interior. The impeller, which is mounted for concentric rotation within the housing, includes upper and lower cover plates, a landing surface being carried upon the lower plate and an opening being formed in the upper plate for directing rock into the impeller. A cylindrical sidewall connects the cover plates and has a plurality of exit openings formed equally spaced around the sidewall. Rotation of the impeller causes a portion of the rock to be crushed to be retained with the impeller by lips and baffles mounted therein, the retained rock forming accumulations having relatively well-defined faces. A plurality of wear plates are carried on the upper and lower cover plates, each wear plate having a recess formed in its surface along the intersection of one face with the wear plate and extending away from the accumulation along at least a portion of the accumulation face. The recess retains rock therein to protect the wear plate surface from abrasion by rock thrown from the impeller.

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First Claim