Abstract An impact crusher is disclosed having a rotor carrying a pair of hammer bars, with each hammer partly within an axially extending peripheral slot diametrically opposite each other. A portion of each leading hammer face within the slot and a facing wall of the slot cooperate to define therebetween a generally cylindrical cavity parallel to an axis about which the rotor rotates. A twopiece bushing is fitted in the cylindrical cavity at each end of the rotor, and each of the bushings comprises a pair of bushing halves each having a convex semi-cylindrical outer surface. The bushing halves are arranged within the cylindrical cavity with one convex surface engaging the hammer defined portion of the cavity and the other convex surface engaging the slot wall defined portion of the cavity, and with a diametrical plane along which the bushing is split into halves, being substantially parallel to the adjacent leading hammer face. The halves of each bushing define therebetween an internal conical shaped cavity with an apex end pointed inwardly of the adjacent end of the rotor. A frusto-conical plug is inserted into each bushing with apex ends pointed inwardly of adjacent ends of the rotor. A rod passes through central bores in both plugs, and nuts threaded on both rod ends hold the plugs relative to each other. Retaining walls are provided within the cylindrical cavity to limit movement of the bushings inwardly of their respective adjacent rotor ends. Movement of the frusto-conical plugs toward each other therefore moves each pair of bushing halves apart. As each pair of bushing halves move apart their convex outer semicylindrical surfaces move apart and apply forces which are directed radially of the bushings to both push the hammer radially into its slot and tangentially against the back wall of the slot, to securely lock the hammer in its slot.
A hammer rotor for an impact crusher having an elongated central body portion with at least a pair of axially extending peripheral slots diametrically opposite each other and extending the entire axial length of the rotor, and first and second hammer means each comprising a hammer bar arranged in one of said slots with a portion of a leading hammer face within said slot and a portion thereof extending outwardly of said slot, characterized by: a. portion of the leading hammer face within the slot and a facing wall of the slot cooperating to define therebetween a generally cylindrical cavity parallel to an axis about which the rotor rotates; b. a pair of bushing assemblies in said cylindrical cavity with one located at each end of the cavity and with each said bushing assembly comprising a pair of separate semi-cylindrical bushing halves each having a convex semi-cylindrical outer surface, with the convex surface of one semi-cylindrical bushing half engaging the hammer defined portion of the cylindrical cavity and the convex surface of the other semicylindrical bushing half of such a pair engaging the slot wall defined portion of the cylindrical cavity, and said pair of bushing halves cooperating to define therebetween an internal conical shaped cavity with an apex end pointed inwardly of the adjacent end of the rotor; c. A frusto-conical plug within each pair of said bushing halves and arranged with its apex end also pointed inwardly of the adjacent end of the rotor, and movable inwardly of the adjacent end of the rotor; and d. a threaded rod projects through both plugs for engaging means operative to hold the plugs in a position applying uniform locking forces at both ends of the hammer.
Claim 2
Dependent Claim
286 words
A hammer rotor for an impact crusher having an elongated central body portion with at least a pair of axially extending peripheral slots diametrically opposite each other and extending the entire axial length of the rotor, and first and second hammer means each comprising a hammer bar arranged in one of said slots with a portion of a leading hammer face within said slot and a portion thereof extending outwardly of said slot, characterized by: a. portion of the leading hammer face within the slot and a facing wall of the slot cooperating to define therebetween a generally cylindrical cavity parallel to an axis about which the rotor rotates; b. a pair of bushing assemblies in said cylindrical cavity with one located at each end of the cavity and with each said bushing assembly comprising a pair of separate semi-cylindrical bushing halves each having a convex semi-cylindrical outer surface, with the convex surface of one semi-cylindrical bushing half engaging the hammer defined portion of the cylindrical cavity and the convex surface of the other semicylindrical bushing half of such a pair engaging the slot wall defined portion of the cylindrical cavity, and said pair of bushing halves cooperating to define therebetween an internal conical shaped cavity with an apex end pointed inwardly of the adjacent end of the rotor; c. A frusto-conical plug within each pair of said bushing halves and arranged with its apex end also pointed inwardly of the adjacent end of the rotor, and movable inwardly of the adjacent end of the rotor; and d. a threaded rod projects through both plugs for engaging means operative to hold the plugs in a position applying uniform locking forces at both ends of the hammer.