US1531792A

US1531792A - Feeding and luting device for metallurgical furnaces

Info

Publication number: US1531792A
Application number: US749122A
Authority: US
Inventors: Louis R Kelley
Original assignee: Bethlehem Foundry & Machine Co
Current assignee: Bethlehem Foundry & Machine Co
Priority date: 1924-11-11
Filing date: 1924-11-11
Publication date: 1925-03-31
Anticipated expiration: 1942-03-31

Description

March 3l. 1925.

L. R. KEI-LEY FEEDING AND LUTING DEVICE FOR METALLURGICAL FURNACES Filed Nov. 11, 1924 v HTTORNEY WITNESS Patented Mar. 3.1, i925,

UNIT-ED STAT-Es Emre-NT:

Louis n. KELLEY, or `isn inrnsarEM, PENNSYLVANIA, yAssrefnon; Qro i'snrritnrrnivr roUNnaY @LMACHINE COMPANY, A yCo,1a-rena'HON or rENNsYLvAN1a.11.-1

'FEnDrNeANn LUTING Vnrzvvror. ron Maremma-Groar. rrrmurons.`

'Application filed November1lf1924. Serial No. 749,122. i

'Tol @ZZl who/m t may concern.'

Be it known thatl I, Loins R. KELLEY, a. citizen of the United i States, residing lat Bethlehem, -in thei county l of Northampton `and 'Stateof Pennsylvania, have invented certain new and useful Improvements in YFeeding.anddniting Devices for Metallurgical `fllurnaces,of whichithe following is a specification.

The object is to provideiin'ore roasting and other metallurgical furnaces,' composed of a'plurality ofsuperimposed hearths-surrounding a rotatingshaft, means to 1feed the ore or other material from a-drying platform, or frornionehearth, toa-hearth therebelow, which means however insures a gastiglit joint tov prevent the irise of `gases -froin each roasting chamber.

Another-object isto provide inthis conynection thezcombination of a liearthhaving an enlarged central opening, with a'. shaft extending through and in spaced .relation with the sides .ofsaid opening,

the.inner rings of fire-brick composing the hearth, orlby anannular .channelled metal plate secured to saidheartli, and a so-called feed-plate carried by said shaftand provided with a depending cylindrical flange extendingv into the` ore in saidv groove.

This plate flange is provided at one point with a notclnand with agate, comprising a plane body portion pivotallycarried'by .theplate and having an angularly depend-v ing portion 'forming a scraper,'the bottom edge of which is just high enough above .the plane of the top surface of the firebricks to provide clearance. y"With this construction, a further object therefore is to` provide a feeding device which cannotdistuib the ore in thelute-groove as it feeds new ore constantly over said `groove and towards r.the central opening inthe hearth.

Still another object lwhich follows as a natural sequence 'is to provide a trap or ygas-tight `joint between the hearth andthe shaft, the first ore in the groove "filling the same about yand in closeA contact with both sides of the ;plate flange and thus preventing gases from a'lowerhearth passing upwardly through thel central aperture and intoyan upper hearth chamber, except attlie notch inthe flange, which however' Aline'Q--Q of Fig. elevation vof the plate'luteapron .and 4feed,-l a groove formed bythe .shape or..arrangement of .therebeneath, hearths 2 passing 'toi thelis constantly choked lvfull y incoming yore as it is impelled by the'iscrapertthrough said notch. f f

and a Sini farther 'Object-.risse provide' adjustable'` means, extending into the .inte- `rior of the rotatable shaftlwhich ishollow,

and pivotally connected with thev gate whereby which ore is lfed from one.

the presentinvention comprises additional altering -said adjustable ,means -varies. :the rate with hearth to a second'hearth 'therebelow r l V Vith `these and other objects rinl view,I

novel details of construction and operation hereinafter fully brought out inl the yfollowing descriptionwhen read in' conjunction with the accompanyinghdrawings, in which Fig. l is a vertical diametrical sec-` tion through a portion of a metallurgical furnace of the type hereinbefore referred to; Fig. Qis'a 'fragmentary section on the l; andFlig. 3 is a side ing gate'shown in Figs. land 2.

Referring to the drawings, a furnace ,is

shown as comprising cylindrical sidewalls l, within which is located a verticalseries ofsuperimposed hearths and 3, the hearths 2 having central` openings f4: which com# paratively closely surround the lire-brick- `covering 5 of a verticallyextending centrally positioned rotatable shaft '6. The

hearths, onlibe-other hand, arefprovided with comparatively large central apertures 7, through which `ore is adapted to pass from said'last-named hearths to the hearths The ore having reached the 'outer periphf ore lfrom the first-named ,the shaft 6. so that none' ofit will pass outwardly partly by by suitable rabbles ery of this hearth passes through the one yor ferred gto.

and fills the channel 10, comprising a socalled lute-groove formed by a series of sectional channel members secured together m any suitable manner, Aas for instance by means of radially extending abutting flanges 11 (shown in Fig. 2).

Carried vby the shaft 6 is a fee-dplate 12, also formed of segmental members secured j together by radially extending flanges 13,

secured in any suitable manner (as also shown 1n Fig. 2).4 Said segmental members therefore lying 1n a common plane and to- .Y gether comprising' the plate 12 are provided with .depending segmental flanges, which being in annular alignment form a continuous cylindrical flange 14, which depends from said plate so that its lower end extends well into the lute-groove 10 and considerably below the level or the plane of the uppersurfaoe of the fire-brick of the surrounding hearth. While the `shaft revolves and carries with it the feed-plate and depending flange, it will be obviousthat there is a constant gas-tight connection formed by the ore in the lute-groove in conjunction with said flange to prevent gases from the vlower hearth passingv upwardly through the opening 7 and into an upper hearth chamber. So much forthe luting feature of this improved construction.

The flange 14 is provided at one point with a notch 15, adjacent to whichis a lug 16. suitably drilled and adapted to receive a pinion-pin 17 y which also extends through a lug or boss 18 upon the gate member. This gate member comprises a horizontally extending plane body portion 19, slidable upon the'upper surface of the plate 12. An angularly positioned, downwardly extending scraper portion 20 is adapted to extend lradially outwardly beyond-the circular path l14, and impel ore with which it comes into Contact inwardly through the notch 15, the lower edge of the scraper being so positioned as to afford ample clearance with respect to the adjacent surface of the hearth.

In order to adjust the angular position of i the scraper 20'and thereby regulate the rate with which the ore from the hearth 3 is fed toward the opening 7,a' rod 21 is pivotally connected at 22to the gate and extends into the interior of the shaft G, where a suitable hand-wheel or the like 23 is provided foradjustably positioning said rod radially. Having effected the desired adjustment of the feed-gate, the continued motion of the shaft will cause the scraper as it engages the ore to maintain said gate in the outermost position permitted by the adjustment of the rod.

Howeveiyif it is desired to remove this tension from the rod, the gate member may be fixed in, any desired position by any suitable means such forl instance as the bolts which removably secure an upwardly extending flange 24 carried by the gate with a similarly positioned segmental flange 25 carried by that plate-segment 12 which is provided with a notch 15.

This construction accordingly provides an efficient feeding device in conjunction `with the luting device hereinbefore described, and of' such a construction that gases, prevented from rising past the feed-plate, will likewise be prevented from passing through the notch '15, due to the constant filling or choliing of said notch with ore passing therethrough under the impelling influence of the kgate scraper 20. v I

Having thus described my invention, what I claim and desire to protect by Letters Pat? ent of the United States is l. In a furnace, the combination of a hearth having an annular groove, a cylindrical member having alower edge portion revolvable in said groove and having a notch, and a pivotally mounted gate carried by said member, said gate comprising an upwardly extending scraper portion normally portion and operative to prevent ore. en-

countered by said scraper lportion from piling against and falling back over said scraper portion.

2. In a furnace, the combination yof a hearth having an annular groove, a cylindrical member having a lower edge vportion revolvable in said groove and having a notch. a pivotally mounted gate carried by said member, said gate comprising van upwardly extending scraper portionv normally kpositioned angularly with respect to said member and operative to impel ore through said notch, and comprising a substantially extending portion integral with said first portion and operative to prevent ore encountered by said scrapery portion from piling against and falling back over said scraperV portion, a hollow shaft to carry said cylindrical member, a rod pivotally connectedwith said gate and extending into the interior of said shaft, and means to Vmaintain said rod in adjustable normally fixed positions to maintain the desired angular positionof the scraper portion of said gate.

3. In a furnace, the combination of a hearth having a-central opening, a circumferentially-positioned series of channelled members together providing an annular grooveadjacent to said opening, a rotatable shaft, a plate carried by said shaft and having a depending cylindrical flange extending into said groove.

4. In a furnace, the combination of a hearth having a central opening, a circumferentially positioned series of channelled members together providing an annular groove adjacent to said opening, a rotatable shaft, a plate carried by said shaft and having a depending cylindrical flange extending into said groove, a notch in said flange, and a scraper pivotally carried by said plate and operative upon the rotation of said shaft to iinpel ore fromi said hearth through said notch and towards said opening.

5. In a furnace, the combination of a hearth having a central opening, a circuniferentially positioned series of channelled members together providing an annular groove adjacent to said opening, a rotatable shaft, a plate carried by said shaft and having a depending cylindrical flange extending into said groove, a notch in said flange, and a gate pivotally cai'ried by said plate and comprising a scraper operative upon the rotation of said shaft to iinpel ore from said.

hearth through said notch and towards said opening, and a disclik e body portion spanning the distance between the scraper and the plate to prevent ore from escaping and falling back o-ver the scraper.

6. In a metallurgical furnace, the combination of a central shaft, a hearth having a central opening through which ore may drop to a hearth below, and provided with an annular channel iron providing an annular groove adjacent to said opening, a

7. In a metallurgical furnace, the combi-- nation of a central shaft, a hearth having a central opening through which oremay' drop to a hearth below, and provided with an annular channel iron. providing an annular groove adjacent to said opening, a

structure comprising a plate secured to said shaft above the level of said hearth and a depending flange carried by said plate and extending into said annular groove and having an opening above the level ofthe hearth, and a gate having a plane body portion piv otally carried by and in slidable engagement with said plate and having al depending angulai'ly extending portion comprising a scraper, operative to feed ore through the opening in said flange towards the opening in the hearth. y i

In testimonyl whereof I have affixed my signature.

Louis R.' KELLEY.