File:Transactions (1871) (14590056398).jpg

Identifier: transactionsmining27amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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pond to those onthe scales and hoist-platforms, while the remaining two matchreturn-tracks for the empty cars. The system of working thecharging-cars is explained by Figs. 1 to 6, which can be under-stood by following the changed position of the cars markedwith the same letter. The loaded cars are marked black; the empty cars are out-lined; the arrows indicate commencing motion. One weie-herwith two assistants and two motor boys on each (twelve hours)turn have, with this apparatus, without difficulty, handled stockfor a furnace producing nearly 10,000 tons of iron in one month,and with a record of 392 tons in twenty-four hours. At timesthe ore is brought in to the scales from a distance of 900 feet.Two transfer-cars are used tor each furnace. The constructionof charging-cars is shown by Figs. 7, 8 and 9. They are pro- THE HANDLING OF MATERIAL AT THE BLAST-FURNACE. vided with drop-bottoms, held by a simple and very effectivetoo-o-le-lock. The coke-car has a capacity of 55 cubic feet or
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c 60 1680 pounds. The ore- and limestone-car has a capacity of 30cubic feet, or about 2240 pounds. The cycle of operation, in-cluding the hoisting, discharge and return to motor-cars of four 0 THE HANDLING OF MATERIAL AT THE BLAST-FURNACE. charging-cars, requires about two to two and one-half minutes.For handling the heavy charging-cars, the top platform is fittedwith tracks running across the hopper on either side of thebell-rod. The two cars raised on the same hoist are run, onebehind the other, upon one of these tracks; the bottoms aredropped by springing the toggle-locks; a special air-cylinderlifts the far end of the track, and the cars are sent by gravityback to the hoist-cage. Such was the arrangement used on thefirst furnace equipped for this charging-method. When thefurnace was blown out it was found, however, that the continu-ous dropping of the stock at four points only had caused thefurnace-walls to cut so, that the cross-section of the upper partof the shaft was nearer sq

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