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• # U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 113) ll'-9" wide x approximately 20*-0" high arched opening at its center, extending 2*-3 1/8" below the floor line of the building. The opening facilitates the installation of the car dumper's platen and accommodates the entry and exit of railroad hopper cars. The base of the opening in each ring supports the platen. The platen consists of two large steel columns, spaced 4 , -8 1/2" apart, which support a set of standard gauge railroad tracks located on top of a 11•-9" wide x 60'-0" long x 2" thick platform set at the building floor level. Laid out on a north-south axis about the centerline of the car dumper, the platen is hooked at its supporting steel columns to a drive shaft extending along the centerline of the structure. Between the platen tracks and located at each rail are the platen retarders. The retarders are pneumatically operated steel shoes which clamp onto the wheels of a railroad hopper car just prior to its rotation. A set of four linearly designed clamp beam and double post assemblies, used for securing the top of hopper cars to the car dumper, form a bridge across the platen tracks. The posts in each assembly are spaced 12'-0" apart about the centerline of the tracks. The distance between the clamp beams is 10'-0" with the outside clamp beams located 15'-0" respectively from the car dumpers northern and southern ring. Each assembly consists of a I'-O" wide x 12 f -0" long x 2'-9 1/2" steel plate constructed movable clamp beam spanning a pair of steel columns located, one each, on the eastern or western side of the platen. Each column in the assembly is equipped with a roller wheel attachment which rides up and down fixed columns by means of an interconnecting wire rope and sheave wheel arrangement. On the eastern side of the platen the fixed columns are part of the supporting steel framework welded to each ring and the platen. The fixed columns on the western side of the platen are encased in the spill truss which is welded to each ring of the dumper. The steel plate constructed spill truss is l f -6" wide x 60'-0" long x 14'-0" high. It is used to support the side of a hopper car as it is being rotated. The dumper is powered by a 40/80 hp Westinghouse Induction Motor running at 1400/700 rpm. The motor is connected to a size 180 Jones-Herringbone Speed Reducer with a ratio of 13.3-1. A 6" diameter line shaft runs through the speed reducer to the north and south ends of the dumper where it connects into a Link Belt pinion gear drive run in an oil bath which turns a chain drive wrapped around each ring of the dumper thereby rotating the structure. Located above and running the entire length of the car dumper is a system of water sprays which are used to clear the air of dust after the contents of the hopper cars have been
dumped. Construction Date: 1957. U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 114) C. Fifty Ton Hoppers: The tops of three 50-ton inverted pyramid shaped hoppers are welded to each other and to a steel framework located 10 f -10 1/2" below the floor of the building. Aligned linearly along a north-south axis, the centerline of the hoppers is located 4 , -3" west of the centerline of the tracks. The centerline of the northern most hopper is located 14'-2" from the northern inside wall of the basement. The opening at the top of the hoppers is 18 f -6" square. The opening at the bottom of the hoppers is 6»-10 3/8" square. The inside walls of the hoppers are lined with ceramic tiles. Construction Date: 1957. D. Vibrating Feeders: Iron ore passing through each hopper is deposited onto a vibrating feeder, manufactured by the General Kinematics Corporation, which is attached to the bottom of the hopper. Each feeder is a 9'-5" long x 9'-0" wide x 2 f -5 1/2" deep steel plate constructed trough, and is connected to four air cylinders which are anchored to each hopper by a 7/8" diameter wire rope. As such, the feeders have the capability of opening or closing the trap door at the bottom of the hoppers. A 10 hp motor powered conveyor belt is provided inside of the trough. The belt drops the ore onto conveyor belt number one. Installation Date: 1970. E. Conveyor Belts Number 1, 2, 3, & 4: Conveyor belts number 1, 2, 3, & 4 are interconnected and run in a south to north direction alongside the trestle from the Car Dumper Building to the northern edge of the ore yard. The belts travel a distance of 2755'-2 1/2". They are distinguished by their individual motor power and drive stations. Installation Date: 1957. 1. Conveyor Belt Number One: Manufactured by the U.S. Rubber Company, conveyor belt number one rests on a steel frame 3 f -9" above the basement floor of the car dumper building. The centerline of the belt is 6*-8 11/16" west of the centerline of the 50-ton hoppers. The belt is 48" wide, 15/32" thick, and 74■- 1" long. It runs at a speed of 550 feet per minute and has a capacity of 3 500 tons per hour at 13 5 pounds per cubic feet of ore. Located at the northern end of the conveyor belt is its motor, gear reducer, and drive shaft assembly. The motor is a 60 hp Westxnghouse A.C. motor which runs at 1500 rpm. The Jones- Herringbone gear reducer has a ratio of 24.1 to 1. 2. Conveyor Belt Number Two: Manufactured by the U.S. Rubber Company, conveyor belt number two rises from the end of
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STEELMAKING PLANT - HEAT TREATMENT
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construction carbon and alloy steel
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