USRE11932E - wright - Google Patents

Description

No. 1|,932. Reisud Sept. r77, mm,

' L. T. wmam.

ROASTING FURNACE,

(Application filed July 22, 1901.\

3 Sheetr-Shaet I.

- WJTZVESSIES": 1 V VENTOR.

1 Q flwwifkr.

ATTORNEY:

No. ||,932. ReissuedSept: |7, ,|901.

- L. T. WRIGHT.

BOASTING FURNACE.

(Application fiked July 22, 1901.)

gTllllll" 3 ShaetsSheet 3.

I INVENTOR. 04%; 77M

WITNESSES:

Magda. M14904 ATTORNEX'.

UNITED STATES,

PATENT OFFICE.

LEWIS ."r. WRIGHT, OF KESWICK, CALIFORNIA. I

srnclrrcarrox forming part of Reissded Letters mm No. 11,952, dated September 1 7, 1901'.

Original No. 529,023, dated July 18,1899. Applioation't'or reissue flied July 22, 1901.. Serial No. 59,343. v

To all whom it may concern: lle it-known that I, LEWIS T. WRIGHT, a"

subject of the King of Great Britain, residing at Keswickflnthe-county of Shasta and State of California, have invented certain new and useful Improvements in Roasting-Furnaces, of which the following is a specification.

My invention relates to improvements in roasting-furnaces, the object of my invention being to provide an improved rotary stirrer for use in such furnaces.

1; My invention is more particularly applicable to what is'knownas the MeDongall roasting-furnace,"and I shall" describe it as applied thereto, it'being understood that I do not limit the application of my invention to any one form of furnace.

j 'I he McDongall furnace contains a vertical series of, floors of brick havingdi'schargee openings in each floor to the floor next below alternately at the circumferenceand at the center. A central shaft. is provided having arms extending'ove'r these floors, said arms carrying rabbles, and the rabble's on the serise of arms are alternately inclined, so as to gradually work the ore that is being roasted first outward to the circumference, where it is discharged through an opening .onto the floor below, then from the circumference to the center, where it is discharged through a central opening onto the next floor,'and so on, being finally discharged from the lowest floor at the circumference. At the same time the air necessary for combustion of the ore passes upward in the reverse directiou'tp the downward movement of the ore.

Now the heat required in roasting certain ores is such that the central shaft, the arms,

'and the rabbles thereon have but a short lifetime and arealways in danger of being disabled by momentary excess of heat; and the objector my invention has been to provide means for cooling these parts, so as to give them greater durability and to enable the temperature of the furnace to be increased,"

if desired, considerably above such a .tem-

p'eratu reas would,if employedwith uncooled arms,rapidly result in' their destruction: 1

My invention also residesin the novel conetraction, combination, and arrangement of parts hereinattbr fully specified,-'and particularly pointed out in the claims.v

-In.the accompanying drawings, Figure l is a central vertical section of the apparatus. Fig. .2 is avertical section, on a larger scale, o'ffthe upper portion of the hollow driving shaft or column and the water-pipe connections. portionthereof. 1Fig..-iis a'plan view of a detail. "Fig. 5 is a vertical section ot the lower end of the hollow shaft and an arm extend ing therefrom,vbroken, partly'in section, and

partly in side elevation, Fig. (Sis aplan view Fig. 3 is a similar view of thelower from below. of one of the arms with iherab- -b1e-holding sectionsjn position therein, but

without the rabbles: Fig.- 7 is a similar View,

enlarged,but showing one rabble in position in the holder; and Fig. 8 is an enlargedft'rans verse section of an armwith a rabble holder and rabble'thereiu. p 2

Referring to the drawings, 1 represents the circular wall'of a McDougallroasting-furnsce having the brick arches or floors 2, the ore-. feeders 3, and stack 4 of the usual construction.. Upon a pier 50f masonryis stepped, as shown at 6 a central verticalshaft 7-, car

'rying a bevel-gear 8, driven through a pinion 9 from any suitable source of power, Said shaft 7 extends through central aperture'sih the floors 2 of the furuace,,of which apertures alternate ones,-as 10, are closed around the shaft, whereas the otherapertures '12 are of greater diameter and form passages through the floors for the descending ore and ascend'- ing currents of air. Passages throughfthe other floors are formed at the circumference, as shown at 1 3. The shaft 7 is revolublysupported at its upper end in a bearing 14,- suit,

ably mounted on I-b'eams 15 at the topofv the furnace. From said shaft 7 extend arms 16,

there being two such arms immediately over each floor in opposite directions from the shaft, 'arms over alternate floors being arranged at right augleswith each other. 'I.o the under side of each-arm. %res ecure'd a number of rabbles, 17,, set ob iquely to" the arm, the function of such rabbles beingjto stir the ore and gradually work it eitherftoward the center or toward the circumference of the furnace,iaccording to the inward or outward. inclination of the rubble. Thus the ore ufte'r being fed throujgh the ore-traps in the topmost arch (indicated at .18 by dotted lines) is alternately moved outward and'iusuitably packedin said stuffing-box, as shown at 71, which head piece does notrotate, but

. is held by stays 22, mounted on the I-beams 15., From the top ofjthe headpiece 21 extends centrally downward a feed-water pipe 23, into which water is supplied from any suitable source, said pipe being of such length as to approaeh within ashort distance ofthe bottom of the hollow shaft 7. The water discharging from the open bottom of the pipe 23 escapes into the bottom of a pipe 24 of larger diameter than and surrounding said pipe 23 and closed at the bottom,so'that the water now flows upwardly in said pipe 2t are screwed, as shown at 25, small branch pi pes 2.6,extending horizontally from the pipe into the arms 1B,whicl1 in my invention are made of piping closed at the end by removable caps 28 to permit of .inspection of the inte rior of the arms 16 and of the branch pipe 26 therein, the outer ends of said branch pipes being supported in said arms 16 by spiders 66. The water flowing upwardly in the pipes 24 passes-radially outward in the pipes 26, escapes from the open ends of said .pipes into the arms 16, returning in said arms on the outside of the branch pipes into the hollow shaft 7 outside the pipe 24, and continues to ascend in the shaft 7. Aspider 29 is mounted between the pipe 23 and the stuffing-box 20, and said spider serves to hold the top of the pipe 24 and close the ann'ular space formed by the pipe 24 around the pipe 23. Through this spider the water passes from the hollow shaft 7, around the pipe 24, into the interior of the stuffing-box 20, thence through the headpiece 21, and out by an exhaust-pipe 30. By this means the arms of the stirrer aresufliciently cooled to withstand the action of. the intense heat of the furnace.

-The rabbles for stirring the ore are in my invention attached to the arms 16 in the following manner: Upon each arm 16 a number of clamps 35 are secured by means of sets crews 36, so as to extend downward from the arms, the lower portion of said clamps being bent around to form claws 37, adapted to engage the sides of a rabble-holder 38. Said holder comprises a bar 39, which is adapted to slide within the claws 37 of a' series of are oblong metal plates.

clamps 35, secured on one of the arms 16 and having ribs 4.0 projecting from the: bar in a plane at right; angles to the plane of the bar, but obliquely to'its general direction, as shown in Figs. 6 and 7 To these ribs 40 are bolted, as shown at 41, the rabbles 42, which The rabble-holder 24. Into said pipe may, if desired, be formed in sections. 69, v

which are inserted one behind thevother be: tweenthe elawsof the'series of, clamps on any arm.-

can be readily remoyed from the arms 16 and replaced thereon forthe purpose of inspec- Lion,- repairs, or renewal.

removal and replacement, sat threaded near their innerend, as shownat 60, and screwed into flanged collars} 6 1,39-

cured on flanged sleeves 62 said-sleeves beingmounted, as

umn or shaft are provided in the wall of' the-furnace,

through'which the arms-and thev branch pipes therein and the rabble holders {supported thereuPQi canbe-withdrawn;

" In my invention also th for the shaft of those floo which discharge peripherally are made su ciently large to permit said shaft to be hoisted'out without the necessity ofpulling out any of the brickwork and are closed by removable plates 11. I claim- 4 1. In a roasting-furnace, the combination,

with'a series of floors, of aeentgal hollow.

shaft, hollow arm'scarried therpon'over the respective floors, an open-bottomed pipe in- ;serted in said shaft, an intermediate pipe/in said shaft into which the first pipe discharges,

open-ended pipes leading from the intermediat e pipe into the hollow arms, and feed and .exhaust pipes connected to the first pipe and hollow shaft, substantially as described.

2. In a roasting-furnace, the combination, with a series of floors, of a central hollow shaft, hollow arms carried thereon over the respective floors, an op'en-bottomed pipe inserted in said shaft, an intermediate pipe in said shaft into which the first pipe discharges, a spider supporting, and closing the top of, the intermediate pipe, open-ended pipes leading from the intermediate pipe into the hollow arms, and feed and exhaust pipes connected to the first pipe and the hollow shaft, substantially as described. A

'3. Ina roasting-furnace, the combination, with a seriesof floors, of a central hollow shaft, hollow arms carried thereon over. the respective floors, an open-bottomed pipe insorted in said shaft, an intermediate pipe in said shaft into which the first pipe discharges, open-ended pipes leading from the intermediate pipe into the hollowarms,spiders within the arms around the open ends of said pipes,

and feed and exhaust pipes connected to the first pipe and hollow shaft, substantially as described. r

\ In thesame man nor the attachment of the hollow arms-16 m the centralsliaft' 7 is such;as.= 9. .facilitate (I 'arms being shown, on aprturedp bos'ses- 63, castyo'n the side of the central'hollow col-I 7 The extreme inner e'nd'ofthe arm 16 is turned to fit snuglywithinsaid sleeve 62 to better support the-arm. Doors central open-his between t-he first pipe and the shaft,

. 1 1 It willreadily beseen that withthis construction the'rabbles and their holder roe shaft, hollow arms carried thereon over the respective floors, an open-bottomed pipe insorted in said shaft, an intermediate pipe in said shaft into which the first pipe discharges at the bottom, open ended pipes leading from "the intermediate pipe into the 'hollow arms, and feed and exhaust pipes I connected tothe first pipe and hollowshaft, described;

5. In a roasting-furnace, the combination,

with a series of 'floors, of a central hollow shaft, hollow arms carried thereon over the "respective floors, sorted in said shaft, an intermediate pipe in an open-bottomed pipe in-.

said shaf t into which the first pipe discharges at thebottom, a spider between-the first'pipe n th sha t,s pp r g; d cl top of,..th'e' interm'ediatepipe, open-ended pipes leading from theinterinediate pip" into the hollow arms, and feed and exhaust pipes connected to-the first pipe and the hollow.

shaft, substantially as; described.

. hollow arms carried-thereon over the respective floors, an 'open-bottomedpipe inserted-in 6. InarOaSting-fHrna e,

I the combination, with a series of'fioors,

of a central hollow shaft, hollow arms carried thereon over; the respective floors, an open-bottomedjp'ipe inserted in said shaft, an intermediate pipe in said shaft into which the first pipe discharges at a the bottom,open-ended pipes leading from the intermediate spiders within the arms aroundtheopen-ends ofsaid pipes, and feed and exhaust pipes connected to the first pipe andlh'o'llow. shaft,

- substantially as described.

'-7. In a roasting-furnace, ,the combination, with a seriesof doors, of a central hollow shaft,

said-shaft, an intermediate closed-bottomed pipe in said shaft into which thefirst pipe' discharges at the bottom, opensended pipes leading from the intermediate pipe into the hollow arms, and feed and exhaust pipes connected to the first pipe-and hollow shaft, substantially as described.

8. I n a roasting-furnace, the combination,

' with a series of doors, of a centralhollow shaft,

hollow arms carried thereon over the respective floors, an open-bottonied-pipe inserted-in said shaft, an intermediate closed-bottomed substantiall y as pipe into the hollow arms,-

pipe in said shaft into whichthc first pipe discharges at the bottom, a spider between the first pipe and the shaft, supporting, and closing thetop of, the'intermediate pi'pe,'openended pipes leading Iromfthc intermediate pipe into the hollow arms, andfeed and ex: haust pipes eonne'cted to the first pipe and the hollow shaft,'snbstantiallyas described.-

9. In a roasting-furnace, the combination,

with a series of floors; of a central hollow shaft,

hollow arms carried thereon o'ver'the respective fioors, an open-bottomed pipe .inserted in said shaft, anintermediate closed-bottomed pipe in said 'shaft into which the first pipe discharges at the bottom, open-ended pipes leading from the'intermediatc pipe into the hollow arms, spiders within the arms around the open ends of said pipes,and,feed and exhaust pipes connected to the first pipe and hollow shaft, substantially as described.

ing: their ends inserted in said sleeves, and

threaded outside said'sleeves, threaded col- 'larsi-on saidthreaded portions and secured ,to said sleeves, and a feed-pipe for supplying water. to said hollow shaft and arms, substan-- tially tie-described 11. Ina roasting-fnrnacc, the combination of a rabble-arm, clamps reinoyab'ly secured at intervals therealong, said. clamps carrying guides in line with each other parallel to said arm, a rabble-holder slidably held in said guides, and rabbles secured to-said holder, .snbstantially.as described.

12. In a roasting-furnace, the combination of a rabble-arm, clamps removably secured thereon, rabble-holder sections held in said clamps and longitudinallyremovable therefrom; said sections havingdownwardly-extending ribs, and-rabbles removably secured to said ribs, substantially as described.

In-witncss whereof I have hereunto set my 10. In aroa'sting-furnace, the combination, with a series ofjfloors', of a central hollow shaft, sleeves secured to the shaft, hollow'arms havhand in the presence of two subscribing wit- 9 '5 nesses. LEXVIS T. WRIGHT.

Witnesses:

WM. HEAD,

F. 0. HURT.

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