Abstract: Fugitive dust generated by a bottom dumping railroad hopper car is captured by a dust containment system. The dust containment system includes an open railroad track segment for supporting the car above a hopper pit defined by enclosed end walls, an interconnecting rear sidewall and a partially open front side. A building structure encloses the track segment and hopper pit and includes roof mounted ventilators for emitting fresh air to the interior thereof. A backhoe device is positioned above the car to assist in discharging material. Air passageways are formed on opposite sides of the track segment with motorized dampers positioned therein. Dust collector units are positioned adjacent to the front side of the hopper pit. The fans of the dust collectors induce a draft from the roof ventilators downwardly along the sides of the rail car, through the air passageways to the hopper pit.

Abstract: An extensible and retractable telescopic chute for delivery of bulk materials includes a plurality of nestable chute segments, namely, an uppermost segment adapted to be attached to the discharge end of a bulk material handling machine, a lowermost chute segment and a plurality of intermediate chute segments therebetween. A yoke member surrounds the lowermost chute segment and is attached thereto. A pair of sheave support posts upwardly extend on opposed sides of the yoke member. Each of the posts carry a rotatable sheave wheel which are respectively adapted to operably engage a wire rope of the hoist mechanism of the material handling machine. The yoke member bears the loading weight of the nested chute segments as the telescopic chute is retracted so as to avoid sidewall deformation of the lowermost segment. The vertically extending sheave support posts locate the sheave wheels well above a center of gravity of the nested chute segments to stabilize the chute assembly above a vertical axis.

Abstract: The present invention is directed to a loading chute which includes a hoist frame adapted to be mounted on a conventional loader conveyor above a bulk material hold of a cargo vessel, for example. A plurality of chute segments are provided and are hingeably attached end-to-end in zigzag fashion such that a lower discharge end of a chute segment is attached to an upper receiving end of a subjacent chute segment. Each hinge attachment includes an outwardly extending pivot pin which is attached to a link plate. The link plates between adjacent spaced chutes are joined together by vertically extending semi-rigid support strands which bear the weight of the array of chutes. Hoisting ropes are attached to the lowermost chute segment and are reeled in and out by motor driven hoist reels or drums. Elastic ropes extend laterally from the link plate members at each chute segment hinge to an adjacent support strand.

Abstract: An integrated dust containment system for machines such as rotary crusher/breakers, vibratory screens and the like of the type use in sizing dusty bulk materials, such as for coal, ore and the like. A substantially airtight enclosure having integral air filter means and fan means is detachably fitted to the machine housing adjacent the material treating station such that the air filter means is in communication with the dust generation area of the machine. A negative draft generated by the fan means draws in dust laden air from inlet and discharge zones of the machine, as well as from the material treating station for capture of the dust in the filter means and susequent discharge of clean, filtered air from the fan means. Pulsed, compressed air back flushing of the filter means cleans the filters and returns the collected dust cake to the machine interior for subsequent recovery.

Abstract: A method and apparatus for the containment of dust within a bulk cargo container such as a ship or barge hold. A horizontal stream of ambient air is directed across the hatch opening by a plurality of interconnected air curtain modules which captures fugitive dust along its path. A plurality of interconnected dust collector modules withdraw the entrained dust particles at an opposite side of the hatch opening and exhaust the filtered air stream therefrom and deposit the filter cake back into the hold. The clean exhaust air from the dust collector modules may be used to form a vertical air curtain to deflect crosswinds.

Abstract: A bulk material receiving hopper is provided with a dust containment system which includes sloped shield plates positioned adjacent a top portion of the hopper to effectively close-off substantially all of the open space thereacross. Restricted material openings are defined by the shield plates and an isolated, dust containment region is established therebeneath to trap the displaced air and entrained fugitive dust generated during a dumping operation. One or more dust collector units communicate with the isolated dust containment region to draw in the displaced air and entrained dust particles.

Abstract: A lump breaker apparatus for a rotary car dumper includes a porous barrier means in the form of a grizzly element, having sized openings therein and positioned in the flow path of the discharged bulk material prior to its entry into the hopper pit. Motorized impact means, preferably rotatable drum means, having a plurality of outwardly protruding striking elements, is mounted on the frame of the rotary dumper, extending between the end plates thereof and moveable with the frame. The impact means is selectively activated to engage and breakup lumps of oversized bulk material retained on the grizzly during a dumping cycle.

Abstract: The dust collection units in a rotary railroad car dumper installation are mounted over the hopper pit along one or both sides of the cylindrical, rotatable dumper frame so that dust ladened air can be sucked directly into the dust collection units without the need for duct work and the collected dust can be returned directly to the pit without the need for easily clogged screw conveyors and small chutes. A fixed enclosure means encloses the top and sides of the dumper frame and form with air shields mounted on the cylindrical dumper frame, a rotary valve which restricts flow such that ambient air is sucked into the hopper pit by the duct collection units at velocities which exceed the capture velocity of the dust clouds created by dumping of the contents of the car.

Abstract: The dust collection units in a rotary railroad car dumper installation are mounted over the hopper pit along each side of the cylindrical, rotatable dumper frame so that dust ladened air can be sucked directly into the dust collection units without the need for duct work and the collected dust can be returned directly to the pit without the need for easily clogged screw conveyors and small chutes. The dust collection units also form with air shields mounted on the cylindrical dumper frame, a rotary valve which restricts flow such that ambient air is sucked into the hopper pit by the dust collection units at velocities which exceed the capture velocity of the dust clouds created by dumping of the contents of the car. The air shields include orthogonal pairs of planar members mounted on the rotary frame.