US1570463A - Unloading device for furnaces - Google Patents

Description

z sheets-sheet 1 M. H. DAMERELL.

1mm/mme pEvzE F011 Fummcss F11ed June 16, 1924 Jail. 19 1.926.

Jan. 19, 1926.

' M. H. .DAMERELL vuNLommxG DEVICE Fon Fummcss Filed .June 416 1924 y 2 Sheets-Sheet 2v Patented Jan.I 19,' r192e. 11.1v A

MARKV kH.v `Aimrnzrn1-tn'I.I. -Y QF awoltcnsfzriia; MfssAcHu'sETTs, iAssieN'on fro WYMAN- GonnoNcoMrAgNY, or woncns'rna, ivriissnenusnrrs;Aconroaamrouor MASSA- .y pounds of scrap steel shall be handled twice` fUNLoADInG DfEvIcE nonFu'attirons'.V 13. ff

f Be it'knownfthat LMARK` n n e a citizen `of the ,.United States, residing fat Worcester, inthe county ofullfll/orester' and State of Massachusetts, have "invented anew f and'useful Unloading Device for l?urnajces,V

of which theY followingy 'ist a "specification.V 'I

ThisVV invention relates particularly to 'fur-v .n'a'ces'in which billets orfbarsofsteelrarev subjected to "piOlQllgGd heat treatment.; It

is customary to feed', the 'billetssuccessively.

into the'furna'ce at 'one' zend,r thereof some suitable mechanism" such Aasr a mechanical pusher. As each additional' billet is. pushed intothe furnace, it advances the ybilletsalready inthe furnace, causing them to lmake aslow intermittentprogres's. .through the furnace to the farther end thereof, where.

they may belaterally removed through 'a side opening in the furnaceWall? t .t Y. Y,

These furnacesV arefoften as mucltasthirl ty feet longY andmay contain ias much` as three'thousandpounds'of steel `at any given time, while they are in operation. At the endfof the days run, itis necessary that vall of the steel in the furnace be removed, as otherwise the*prolongedY exposure tothe heat remaining in thefurnace wallswill cause the steel to'scale and to suffer other injuries, even after thefsupply o f additional vheatis shutoff. e l y f For clearing the furnace, it has lbeen, customary to eed in a sufficient :numberk of defective -or scrap billets to'forcejforward all of the ygood billets to theV point wher'el the heattreatment is completed and where ,L

the goodVY billets may be removed. laterally from the furnace. All of these defective 'billets must be thereafter removed. fromthe" furnace upon the starting of the'next days run. 1 This method of clearing the 'furnace thus requires that some three thousand Y l Vide a simple and Yconvenient unloading devicefor such furnaces, by means ofv whichVlr cleared of billetsrat theend of. eachfrun.

` In the preferred formthisdeviceis actus" ated bythe usualfpus'her mechanismV and provision is also made forV mechanically Kwithdrawingv the ldevice and moving theY .i Q-is asimilar view, but

plates,Vv v t;

t.. "Fig-.f `is a fplanviewy of a/second forn`:l V of 1 e ff-Myinventi yn further relates toarrangelarly .pointjedfnout inthe appendedvclfaimscf .f

furnace, .with ,improvedv nev loading device ,appliedtheretog f unloadingvdevice inlinoperative positiong..

,taken along the/.line 3- -3 inl Fig." l; A 1 nFig. .4'is aplanview of oneof the pusher --Fig '3,is a transverse sectional elevation,

pusher plate;

platesshowninFigs. 5 andf,

jFiggjT'is 'a side elevation thereof; v

@Fig eis-,anda "viewer eater off-hef? ing the `manner in which thelunloadingdevice is ,actuated by the pusher bar.;y

'rnents;andcombinations of parts whichwill be hereinafter; Adescribed andbfrnoreparticuf .y

'60 i' [Apreferred form of-the inventien- -Fig.r, ','lslc'a ve'ctiona'l .sidel elevation; of a Y heatv treating j y js5 Showing the Y Fig. `8" 'sa plan view of a p1ate; feeding f or pusher head, and i y Fig. 9 isagsection'all side elevation,fshowl R ferringto the drawings, I, have cated heaty treating furnace 10 which is y,substantially of the usual type,'having provision (not shown) for kintroducing highly heated'gas'es ati'the left handor discharge endof the vfurnace and' for removing. the.y t somewhat cooler gases at the right Vhand endY iplacedsuccessively' upon aloading platfor'ir'i` 9G f' or'sfupport ll and arepushed-intothe fur- L nace' bygap'ushe'r bar 12- actuated .through any', other convenient manner.` `lAsthe bilv.lets advance through the furnace, they. are

preferably [supported u'ponfwater cooled l v pipes ortubes 16 until f theyA approach the dischargeendof thefurnace. y `At this point they preferably' descend kto as lightly lower supportfthis laction causing relative' move- L Y l ment between lthe billets so that they-may f thev furnace may be conveniently andeasily@` fbe freed'fromfeach other ,at this point. l

i AtV the eXtreme left Vhand or discharge .end of the furnace, the f billets v areV aligned with an lopening1"?"5inthe sidewall of thef` completed by the time the-billets arrive opposite the opening 17.

The construction thus far described is of the usual type and in itself forms no part of my invention which relates particularly t0 means for unloading the furnace at the end ofa run. For this purpose I provide a series of pusher plates 20 linked together by pivots 21. The chain-like structure thus formed is stored in inoperative position upon suitable supports 22 above the furnace during the normal operation of the furnace. At the feeding end of the furnace, thennloading device is supported upon'a pair of sprocket wheels 23 which may beactuated in either direction by a reversible electric motor 24 connected to said sprocket wheels through suitable reduction gearingAV The details of constructionof the unloading device are clearly shown in Figs. "4 to 7 inclusive. The pusherplates 2O are commonly of the form showniin Fig. 5, with an opening 25 in themiddle portion thereof. One or more of the plates whichy form the advance end of the chain are vpreferably of the form shown in Fig.l 4i, Without any opening through Vthe middle portion thereof, and these plates are also preferably made of some special material which will strongly resist high temperatures. The provision of the solid web in these leading plates is specially desirable as they serve to protect the pipes 16 from the high heat retained in the furnace walls after the furnace is unloaded.

A pusher head 30 (Fig. '8) is provided for intermittently advancing the pusher plates into the furnace. This pusher head has an opening 31 adapted to lit'loosely over the upper end of the pusher bar 12 (F ig. 9) and is reciprocated thereby. The plates 2() and 26 have their pivots so disposed that the pusher head 30 may freely engage the rear edge of each plate as it rests upon the loading frame 11. After each plate is advancedV by the pusher head, the head is Withdrawn and the succeeding plate drops into position lfor engagement by the pusher head. The unloading device is thus intermittently'advanced through the furnace and pushes the billets remaining in the furnace forward to Vthe discharge end of the furnace, where they may be laterally removed. After the Ifurnace is thus emptied, the unloading device is left in position, in order to protect the pipes 16 While the furnace is empty.

At the beginning of the next run, the pusher head `30 is removed from the pusher bar 12 andthe motor '24 is operatedA to rotate Vthe wheels 23 inthe opposite direction,

withdrawing thechain of plates from the furnace and storing it upon' the supports 22. When the furnace'is to be again unloaded, the motor '24: vis used'to advance the chain to a position where the first Vplate may be engaged by the pusher head. The ends of adjacent plates abut squarely, sothat upward movement or buckling of the plates is resisted.

It will thus appear that have provided lan unloading device bywhich the furnace may be easily emptied of billets' at the end of a run, substantially without manual labor and with a minimum loss of time.

Having described my invention and the advantages thereof, I do not wish to l be limited to the details offconstructipn herein disclosed otherwise than as'siet ,forth the claims, but what I cl'aimis; A

1- A furnace un1tigaclilfllafA dence Comprising a sectionalstoc'lr engagingmember, and means' t0 advance' Said" inerrber lengthwise of the furnace and withinithe .same to cleail the furnace of stock, saidmeans eoinprising a reciprocating element effective to separately engage successive s'ections of said stock-engaging member and lto give each section th'us engaged a predetermined advance movement into said furnace; i' i i 2. A furnace unloading device comprising a stock engaging 'member means to intermittently adi'fancesaidV member lengthwise of the furnace and within the saine to clear the furnace of stock, and Yadditional separate means to withdraw said member to 1inoperative position.'

3. `.A furnace unloading device comprising a series of pusher plates piyotally connected together, means to advance said series of plates into the furnace, 'and guide-ways said furnace for said plates, said guideways being coveredand protected by said plates ,when thelatter are positioned within the'furnace.v l i et. A furnace unloading device comprising a series of pusher'plates pivotally connected together, means to advance said series of platesto operative position, and additional'm'eans to advance said ,plates into the furnace. i

5. Ina furnace, a pusher bar, an unloading device comprising a series of pusher plates, and a pusher head fitting saidbar and reciprocated'ther'eby to intermittently advance said plates.

6. A furnace unloading device comprising a series of pusher plates p ivotally connected togetherpmeans to advance' said series of plates intermittently into the ,furnace, and a guide-Way to support said .pla-tes in inoperative position above Vsaid furnace said guide-way being mounted on and firmly secur'ed tosaid furnace in permanent fixed relation thereto.

4In testimony whereof I have hereunto affixed my signature.

MARK DAMERELL.

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