Abstract: This apparatus (10) for reducing lumps of coal, and the like, on a grid (14) disposed over a material-receiving area (16) includes a carriage (12) guided across the grid (14) on a track (44) by a drive system (50) and having roll assemblies (60) mounted thereto. Each roll assembly (60) includes a drive roll (62) having stationary shaft assemblies (66,68) mounted to the carriage (12) and driven by an internally mounted motor (78), and a set of pick rings (64) mounted to the drive roll (62) at longitudinally spaced intervals and having pick circles with picks (90) pointing in both directions. The material-receiving area includes a conveyor system which, when the area is wide, includes a longitudinal conveyor (100) flanked by a plurality of lateral feeder conveyors (102).

Abstract: A coal crusher roll includes a smooth tubular cylindrical back-up roll having a series of regularly spaced tapped radial holes to receive bolts by which eight identical shell segments may be fastened on the back-up roll. The holes at the axial ends of the segments are undercut to provide a rabbet into which fits the tang of a special lifting hook by which the segment can be easily handled by a lightweight crane. A recess in the central part of the segment defined by a peripheral berm around the backside of the segment reduces the weight of the segment, provides a place for receiving balancing weights, and simplifies the face fit machining for the segment with the back-up roll.

Abstract: A coal crusher roll includes a smooth tubular cylindrical back-up roll having a series of regularly spaced tapped radial holes to receive bolts by which eight identical shell segments may be fastened on the back-up roll. The holes at the axial ends of the segment are undercut to provide a rabbet into which fits the tang of a special lifting hook by which the segment can be easily handled by a lightweight crane. A recess in the central part of the segment defined by a peripheral berm around the backside of the segment reduces the weight of the segment, provides a place for receiving balancing weights, and simplifies the face fit machining for the segment with the back-up roll.

Abstract: A dust abatement device including an intake or collecting means for delivering air to a rotating fan constituting a propulsion means, and outlet means directing air from the fan in a curtain at an area of dust concentration to inhibit dust movement out of the area. The intake means includes a duct extending from the fan to the area of dust concentration to pick up and deliver air-borne dry dust particulate from such area to the fan, the fan mixing the dry dust particulate with liquid sprayed on the fan to provide a slurry, and the outlet means directing the air and slurry from the fan to the area of dust concentration so that the slurry further wets the dust particulate at such area. The dust abatement device can be mounted on a machine that includes a mechanism for acting on material in a manner so as to create the area of dust concentration.

Abstract: The replaceable striking plate, which has a leading impact face, extends between opposite rotor rings of a disintegrating mill, and provides the basis of an impact system. The leading impact face extends rearwardly from its inner edge toward its outer edge at an angle with respect to a radius substantially within the range of fifteen (15) degrees to thirty (30) degrees for the major portion of its radial height, and extends relatively forwardly to its outer edge for a minor portion of its radial height. The major impact face portion has sufficient radial height so that a slug of particles striking the face will all impact on that face without some particles over-shooting the top and thereby missing impact. A clean face surface is provided for the impact of each succeeding "slug or ribbon sheet" of particles as they strike the face. A portion of the new slug does not impact onto a bed of old particles still remaining on the impact face from a previous slug.