Pennsylvania Crusher Corporation

Joseph P Nigro

William F Hahn

Anthony W Slikas

Frank Wallitsch, Jr

A ring hammer (10) is disclosed for use in material reduction apparatus such as a coal granulator, the ring hammer including a substantially circular body (12) having a plurality of circumferentially spaced radially projecting teeth (22) joined by a corresponding plurality of connecting segments (30). The teeth and connecting segments taper inwardly (26, 32) from their outermost surfaces (24, 34) toward the axial ends (28) of the hammer, the taper of the connecting segments being significantly larger than that of the teeth. This geometry facilitates manufacture of the hammer by forging and insures the presence of tooth-like projections on the hammer even when the outer surfaces of the teeth have worn down to the level of the connecting segments.

Ring hammer

An improved apparatus for the simultaneous crushing and drying of materials, such as coal with high moisture content, which includes a hammermill having parallel top inlets for the material and a rapid flow of hot air. The material drops into the impactor circle of the hammermill prior to any substantial mixing with the flow of hot air. The flow of hot air is selectively directed into the crushing chamber, behind the breaker plates or in parallel to both locations, to dry the material during crushing. A substantially unobstructed bottom outlet permits high flow rates through the apparatus. A method of crushing and drying high moisture content material is also disclosed.

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Villanova, PA, United States of America

Joseph P Nigro