US1069738A - Feeding device for roasting-furnaces. - Google Patents

Description

H. H. STOUT. IEEDING DEVICE FOR ROASTING FURNAGES. APPLICATION FILED- FEB. 2, 1912.

ggqgga yPatemaed. Aug. 12, 1913.

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PATENT E. ST'QUT, @E BERKELEY, CALFOB-NIA, ASSGNOR T0 GENERAL CHEMICAL A CORPORATION OF NEVI YORK.

BEVIQE FOR ROSTING-FURNACES Application flied February 2, 1912.

'Specification of Letters Patent.

Patented Aug. i2, serial no. 675,0124.

o GJ! whom. te' may concern:

Be it known that l, HARRY il. S'rou'r, e citizen of the vUnited States, und a resident of the city of Berkeley, county of Alameda, State of California, have invented a new, useful, and Improved Feeding Device for Reestingurneces, of which the following, teken in connection with the accompanying drawings, is a specification. i

My invention relates to roasting furnaces, especially such as ere used for roasting' pyrites or other ores, and such as are provided with stationery heortlisupon Which the ore is stirred and distributed by rekes or plows aiiixed to a rotating erin, and has for its .principal object the provision of inea-ns whereby the ore may be fed to the furnace automatically, periodicelly and in regulntuble quanti s, l

An `apparatos embodying niy invention is illustrated in the accompanying dreivings in whichw Figure l is vertical section of a portion of e furnace equipped with my improved feeding mechanism.; Fig. 2 is ay plan view of :i dianietral portion thereof, showing' particularly the primary feeding mechanism of my invention; Fig. 3 is an enlarged elevation of tle secondary feeding` mechanism, the hopper thereof being in longitudinal vertical section; lfig. i is a longitudinal vertical section on the line 4 4 of llig, 3. Fig. 5 is a cross section on the line 5-5 of Fig. 3 und Fig. is a detailed View showing a modified wiper.

The ore vroasting` furnace shown in the drawing belongs to the 'ivelldrnown type such as is shown and described, for instance, in the patent to Ylohn B. Francis Herreshoif, No. lo,l5, dated November 2Q, 1910.

'the furrcice' comprises e cylindricel structure surr. d by easing l and provided with a se l floors of which three only shon ant'. indicated in l by the reference characters 2, 3 and el, the floors boing; anernelely provided With periphcral apertures es Q and if and centredv apertures, 3. The upper floor 2 constitutes a roof if -r the fern-ece and is utilized as a for supporting ud drying the ore before is fed the b in? hearths formed tloors, 8 und nd the other floors within the furnace. She gaseous products pase out through the o At l.

Este-riding; vertically three,l the center of the furnace a rotatable shaft 5 to which is affixed a plurality of horizontally extendin stirrer ernis or rabble arms 6, 7 and 8. The arms 6 are preferably four in number and extend over the top or roof 2 and are provided preferably alternately With suitable plows G and suitable dellecting projections 6, The ore fed to the roof of the furnace is stirred by the projections 6 and G as the shaft 5 rotates. The projections 6 are set at an angle so es to deflect the ore toward. the peripheral aperture 2. After being fed. through the aperture 2 to the ore supporting hearth 3, the ore is stirred and deflected toward the opening 3 by the angularly arranged projections 7 on the rabble arms 'i'. After passing through the opening 3, the ore is stirred and deflected` toward the openiup,r 4 `in the hearth floor /i by the projections 8 of the rubble arms o'. There are preferably two rubble arms 7 and two rabble arms 8. rabble arms, obviously, are alternately oppositely arranged so as to properly deflect the ore toward the apertures in the hearths.

The shaft 5 is supported in n lower bearing (not shown) und an upper bearing 9 edjustably seated upon a plate l supported channel irons 1l, which latter extend across the top of the furnace and are suitably supported upon the casing l. rEhe shaft is hollow and carries concentrically within it a tube 5 from which u cooling lluid, such as air, is adapted to pass into the spaces of the hollow rabble arnis. After traversing the arms the cooling fluid passes into the shaft 5 exteriorly of the tube 5 and escapes therefrom into the stack l2, provided with a suitable damper 12, by passing successively tlnfouglA lapertures l-S in the shaft 5 and a space between the channels ll formed by the partitions il and the closures il, the stack 1:2 being in communication with said space.

rlhe plate i() at one side of the shaft 5 is formed with a vertical extension to which the primary feeding hopper lelis suitably attached, the hopper beingso positioned that ore fed into it is discharged upon the plate i0. The spout portion of the hopper comprises a lined portion le end e, telescopic extension lei which is vertically slidable With reference to the lined spout portion and which is adjustably held in position by means of bolt-end-nut devices l5. lt is obvious that by manipulating these devices, the extension may be moved toward or away from the ore-supporting plate 10 and Isecured in any adjusted position.

Secured to the shaft 5 so as to rotate there with is a radially extending arm-16 provided with an extension 16", the latter being arranged to pass in its rotation between the support l0 and the spout oi the hopper le'. The extension 16 is adjustably connected with the arm 16, by a suitable connection, as the pin and slot device 16". By means of this adjusting connection, the relative distances between the extension and the plate l0 and between the extension and the discharge ori` tice oi the hopper may be Varied as desired. The extension 16 projects angularly from the radial arm 16, as is clearly shown in Fig. 2 of the drawings.

Positioned in the opening Q in. the roof 2 is the hopper 17 'of the secondary feeding device through which the dried ore is adapte ed to be fed lupon the burning hearth 'The spout portion of the hopper 17 coiniscs a fixed portion 17 and a telescopic .tension 17, the latter being vertically slidable with respect to the former. In orderto insure t ready and accessible adjustahility of the extension '17, l hare proyided a member 1S screw-threaded at its upper end and forked at its lower end, the forked portions being secured by suitable means, as, tor instance, by the holt and n-utconnections 1S to the extension 17 and the screw `threaded portion extending through a suitably supported bracket 19 and being engaged thereabove by a nut 20. It will be readily understood that manipnlation of the nut 20 will result in a corresponding movement ot thc extension t7.

.fitrranged' on the extremity of one or more of the arms '7 is an extension 91. which, as the arm revolves. is adapted to sweep under the mouth of the hopper. The extension Q1 is angularly disposed with respect to the radial arm 7 as shown particularly in Fig. 5 of the drawings. The mouth oit the telescopic extension l?" is cut at an angle as shown best in Fig. -t ot' the drawings. A ln Fig. (3 l. have shown a slightly moditied form of wiper which consists of a plate 2Q suitably secured to amlprojtuiting troni the end ol' the rabble arni.

In the operation ol the tui-nace. ore is placed in the hopper t1 by which it is discharged upon tluplate 1t). until the dis charged orc i'orms a pile. the top of which closes the mouth ot' the hopper. lt is oh- 'yious that the amount discharged will `vary accordin l to tht` position ot the telescopic extension il" rclatircly to the plate 10, as well according to the degree of fineness to which the ore has been reduced, the amount of moisture in the ore and other conditions. The automatic closing ot the hopper orifice will take place also in a construction in which the orifice is at the side rather than at the bottom of the hopper spout., As the shaft 5 rotates, the wiper 1G passes between the plate l0 and the spout portion of the hopper and, obviously, moves a portion of the ore across the plate from the edge of which it drops upon the root 2 therebelow. The portion 16 of the wiper being disposed at an acute angle to the direction of motion, the ore is pushed from beneath the spout in a direction which is at an acute angle to said direction of motion. The angle ot the extension lo is so arranged that the ore is caused to more in a general direction toward the opening` 2 in the hearth below. This feature will be readily understood by referring to F of the drawings: the direction of rotation of the shaft being indicated therein 'oy an arrow. If a proper amount of ore is not 'led in this way for a particular adjustment ot' the telescopic extension 14., the latter, obviously, may loe adjusted to another position in which a proper amount ot ore will be fed, it being essential. however, that the spout extension be not .lowered sutticiently in adl justing to come into contact. with the wiper lo inthe rotation of the latter. its soon as a portion ol the pile ot ore has been rcmoved in this manner. a new pile is formed by ore discharging from the hopper. A port-ion of this pile is removed by the next. passage of the wiper, immediately subsequent to which a new pile is formed. The repetition ot thisI process, it will be seen, causes a periodic 'feeding of ore to the'furnace, the feeding being both automatic and regulatable. After reaching the drying hearth Q, the oreis lstirred up and gradually moyed toward the opening Q' by means ol' the arms l'. The secondary feeding means aut:unatically t'ccds thc ort` trom the hearth Q to the hearth 'ihc operation of this feeding mechanism is similar to that ot the primary tccding mechanism. as described aboyc. The ore irst passes through the hopper l? and the telescopic extension thcreolE li and` Forms a pile on the top of tho hearth thcrelwlow. When the pile thus Jformed reaches the mouth oit the spout; portion so as to clos-c the same. the hopper begins to lill with orc. "ir'hcn the wiper 2l has passed beneath thc hopper and moved away a` portion ot' the pile of orc therebenath, a new supply forms a new pile and more orc` from the hearth 2 moved .into the hopper. The wiper 2t is angularly disposed with reference to the direction of inotion thereof. similarly to the wiper 16, as will be readily understood by an inspection of Fig. 5 of the drawings, in which the direction of, rotation is indicated by the arrow therein. H the proper amount of ore is not being fed by the secondary feeding de'- vice, the manipulation of the nut 2O will vary tbe position of the telescopic extension 17, as Will readily be understood, so as to insure a proper feeding of ore.

The Wiper 22, shown in Fig. 6 of the drawings, may be substituted for either the Wiper 16 or the Wiper 2l. In every case the Wipermoves in proximity to the -discharge orice of the ho per so as to remove a portion of the pile o ore. The Wiper 22 obviously does not necessarily sweep directly between the ore support and the hopper spout but, may operate at one side of the spout to remove a portion from the side of the pile of ore in Which case the telescopic spout portion may be lowered without danger of its coming into contact with the Wiper and the discharge may be thus wholly shut ofi'.`

In practice t-he hopper 17 is at all times filled with ore. -Gaseous products are thus prevented from escaping from the furnace through the feeding hopper. l/Vhen adjusted to proper position 'the telescopic extension .does not require to be again moved during the operation of the furnace.

It will be .seen that the two feeding devices are operatively related to each other. If, for example, the primary device is adjusted to feed more ore than the secondary device is capable of feeding, either or both of said devices may be adjusted properly t0 regulate the feed. If, on the other hand, the primary device furnishes an insufficient quantity of ore relatively to the secondary device, sothat the secondary hopper is apt to become empty 'and permit gas to escape through it, either or both of the devices may be adjusted in an obvious manner to insure the proper operation of the furnace.

it will ot' course be understood that various changes in the details ot' construct-ion may be made'without departing from the spirit ot' my invention as defined by the appended claims.

extension, substantially as and for the purpose described.

3. n a roasting furnace having a stationary top and a stationary hearth therebelow, the combination ot a hopper anixed to said top and having a telescopic spout portion extending toward said hearth, a stirrerarm adapted to rotate above said hearth and a Wiper extending from said arm and adapted to move in proximity to the mouth of said extension, substantially as andl for the purpose described.

4. in a roasting 'furnace having a stationary top and a stationary hearth tlierebclow, the combination ot an adjustable primary feed hopper, an adjustable scconllary feed hopper, means for automatically feeding ore from the primary hopper to the top and for automatically feeding ore from the secondary hopper to the heart-h, and means tor feeding to the secondary hopper the ore discharged from the primary hopper, subsian tiaiiy as and iter the purpose described.

In testimony whereof, l have hereunto set my hand in the presence of two subscribing witnesses.

Ylfitnesses JOHN A. Fenceson, Jenn A. Knunnnsncii.

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