US1373620A - Stewart grate construction for sintering-machines - Google Patents

Description

A. L. LARSON. STEWART GRATE CONSTRUCHON FOR SINTERING MACHINES- Patented Apr. 5, 1921.

APPLICATION FILED AUGJOI I920. 1,373,620.

3 SHEETS-SHEET 1.

TORNEYS A. L. LARSON. STEWART GRATE CONSTRUCTION FOR SINTERING M ACH I N E S.

Patented Apr. 5, 1921.

APPLICATION FILED 16.20, 1920. 1,373,620.

3 SHEETS-SHEET Z.

' INVENTOR 1217.2 mar;

av T 72 if Q 771)! n ATTORNEYS A. L mason. STEWART GRATE CONSTRUCTION FOR SINTERING MACHINES.

APPLICATION FILED AIM-1.20. I920- Apr. 5, 3 SHEETSSHEET 3- INVENTOR Allamon f "L I f" RNEYS PATENT OFFICE.

auonsr L. reason, or xnnnoee, name.

STEWART GRA'I'E'CONSTR'UGTION FOB SINTEBING-MAOHINES.

Specification of Letters Patent.

Patented Apr: 5,12%}.

7 Application filed. August 20,1920. Serial No. 404,778

To all whom it may concern:

Be it known that I, AUeUs'r L. Laasorna citizen of the Dominion of Canada, residing at Kellog in the county of Shoshone and State of daho, have invented certain new and useful Improvements in Stewart Grate Constructions for Sintering-Ma chines, of which the following is a specification.

This invention has reference to improvements relating to what is known as Dwight & Lloyd sintering machines and more particularly has reference to improvements to that form of grate mechanism embodied in the present practical application of sinterin machines of the type mentioned, known as the Stewart grate constructiom and invention is specificall directed to the improved arrangement 0 the grate bottomsof the pallets or carriers embodied in such grate construction.

It is well known to those familiar with the use of sintering machines, that the modern type of such machines include a lar e numher, as high as forty-two individua pallets or carriers that travel along endless wa s with the ore contained therein which are su jected, during a art of their travel, to the desulfurizing an sintering operation, after which, in the return movement and inverted position, the loads of treated ore contained in the said individual pallet are discharged, the empty pallets traveling back to be again conveyed to their uppermost position to be again recharged.

In the construction of sintering machines of the general type stated, each pallet has a grated bottom whose members are bolt'ed tightly to the pallet sides and as a result of such attachment, when the tes become heated and expansion takes p ace, the grate bars or members do not stay in the desired alinement and also, due to the heat of the furnace, clinkers frequently are formed in the slots of the grate surface, thereby greatly interfering with the extraction of the sulfuric gases.

To overcome this serious objectionable condition, it has been necessary to station a man at each machine whose duty it was to clean the grates as the pallets move around the furnace. L

the shovelingl .,cally made, easily applied for use, and

eral of the pallets or carriers 7 in o erative position.

Whic That this defect in the operation of the Dwight'& Lloyd smtering machine be fully appreciated, it should be stated, by the improper expansion grate lI'OIlS (and by the impro er expansion is meant that the heat of the urnace causes the ate members to expand in different directions) which results 1n the grate slots becoming tight on the one side and leaving too much space at the other side, and since the ore in t e traveling pallet is usually crushed fine, it (the ore) naturally passes through such widened grate slots, often necessitating of tons of the wasted ore back into t through the roasting process.

Primarily, my invention has for its obiect to provide a grate construction for pa ets of sintering machines, which is selfcleaning and which practically overcomes the improper expansion of the rate irons and the consequent elimination o the aforesaid ore wastage and extra labor required for gathering such wastage for retreatment.

Another and essential feature of my indesired or perfect of the r e bins to be again carried vention is the provision of a grate construction for sintermg machine pallets or ore carriers, in which the grate members are particularly designed for being economiemplayed to a eater advantage in a number of respects t an can be present in the construction of grate bottoms of the character referred to and used in ore treating apparatus.

The preferred embodiment of my invention is illustrated in the accompanying drawings in which sintermg machine are represented as is suflicient portions of a.

necessary to illustrate a practical application of my invention and in which:

Figure 1 is a side elevation of a portion of a sintering or ore roasting machine sevbeing s own F1 2 is a diagrammatic sectional view illustrates a numb allets positioned as passing across the ore x of the sintering' machine J 'Fig. 3 is a detail cross section taken on the line 3-3 on Fig. 2.

Fig. 4 is a plan view of a pallet equipped er of ore loade stationary grate with my improved construction of grate bottom.

Fig. 5 is a cross section thereoffthe grate bars or irons being at the normal or load carrying position.

Fig. 6 is a view similar to Flg. 5, the pallet being shown at a reversed or dumping position and the movable grate Irons at their shifted position for efi'ectmg the selfcleanin of the iron.

Fig. is a perspective view of one of the end grate bars.

Fig. 8 is a similar view of one of the mov able grate bars.

Fig. 9 is a perspective view of one of the ars.

Fig. 10 is a detail view illustrating the cooperative relation of the clamping bar shown in face View and the assembled rate units, the latter being shown in end e evation.

Figs. 11, 12 and 13 are detail cross sections taken on the lines 1111, 12-l2 and 1313 on Figs. 7, 8 and 9, respectively.

As before stated, my improved grate construction is especially designed for constituting the bottom of pallets or carriers that form an essential feature of the Dwi ht & Lloyd types of sintering machines an that the o erative arrangement of such allets and their grate construction be readi y understood, a sintering machine of the kind stated is diagrammatically illustrated in Fig. 1 of the drawings and the cooperative arrangement of the members of the pallets or carriers with the ways on which they travel and the air or suction box over which they pass is illustrated in Figs. 2 and 3 and, in the said Figs. 1, 2 and 3, 1 designates the endless track that is arran ed to support and direct the series of pal ets or carriers 3, which serve as the supporters for the ore durin the roasting and sintering bperation.

It s ould be stated, the allets in ractice, are caused to move slow y in the irection indicated b the arrow the means for effpcting suc direction 0? movement of the pallets for feeding the ore and for igniting the ore, after being delivered to the pallets, bein readily understood by those familar wit the use of sintering machines of the type mentioned by referring to Fig. 1' it being alsohinderstood that, after the ore has been ignited, it passes with the pallets across the air box 2 and after passing from the air box, the said pallets, in their travel, pass downward over a circular path, overturning at-such point to dischar whatever load they may .carry, one of t e pallets bein the discharge point in ig. 1 an another indicated as returning down the inclined way toward the other end for being again carried up in position for reloading in the same within the pallet to the said pallets shown positioned at The general arrangement of a number of pallets or carriers, their ates and the manner of sustainin such pi lets on their ides and ways is c early indicated in Figs. 2 and 3, which also show the normal relation of the grate members and the means for confinin them in proper operative position frame. a

In the present construction of sintering machines of the type referred to, the grate bars are all fixedly held in place, either by bolting the grate irons individuall to the sides of the pallets or by connecting bars made in an angled shape and whichv project slightly over the grate, such arrangement causing a percentage of the ore to pass through without having the gases properly extracted, the said connecting barsusually requiring six bolts for securing them in place, thereby causing some inconvenience, when it is necessary to remove or replace a gate iron.

eferring now more specifically to the essential features of my invention, reference is made to Figs. 4, 5 and 6 of the drawings, which illustrate a complete pallet in which is included my improved construction of rate bars.

he grate bottom as shown, comprises two fixedly held end grate bars 44, two intermediate fixed ate members 5-5, three movable grate firs 6-6-6 and two connecting bars 7-7, one of which is located at each end of the pallet or-box.

One of the movable grate members 6 mentioned is located between the pair of fixed grate members or bars 5-5 and .the other two movable members 6-6 are located between a fixed bar and an end bar at their reective sides of the pallet frame, as is best s own in Figs. 2, 4, 5 and 6.

The end bars 4, as also the intermediate or fixed grate members 6, are of like con- 'struction, one of each of the said end bars the movable bars and the intermediate fixe bars being shown in detail in Figs. 7, 8 and 9, respectively.

It will be noticed by referring to Fig. 5, the adjacent edges 40, 50 and 60 of the several end, the movable and the fixed grate bars are. tapered to allow for a certain amount of play of the movable bars sufiicient when the 6, for dum ing the ore, that the -'ars cause the movab e bars to shake in suc manner and to leave their normal position, shown in Figs. 2 and 5, and assume the position shown in Fig. 6 that the slots or s aces between the several ate bars are sel -cleaned and, as the movab 0 bars 5, in practice, fall the distance of about one-half an inch, provides for forcin any ore on the grates, in the form of clin ers, out of the grate slots, the Ore falling into the proper bin.

pallet reaches the turning over or discharging position, shown in Fig;

y no

- other parts thereof, by

In my construction of grate the several bars 4, 5 and 6 have their en s' eculiarly shaped for cooperating with the coacting edges of the connecting bars that hold the several bars 4, 5 and 6 downonto the inturned angled flanges 30 of the allet frame and, in my grate construction, t ere are two of such connecting bars:7, one for each end of the-pallet box or frame and for enga ing with their respective ends of the grate 7 ar.

Each connecting bar 7, one of which is shown in detail in Fig. 10 is of sufficient length to extend across the ull width of the pal et box (see Fi A) and it'has three bolt holes -70-70 or receiving bolts 8 and each bolt hole is elongated vertically for adjusting the bar 7 -to allow for a proper fitting of the connecting bar in connection with the several fixed grate bars.

The lower edge of each connecting bar 7 is shaped for e ecting a simple and easily fitted adjustment with the peculiarly shaped ends of the several ate bars 4, 5 and 6 and for such purpose, t c said lower edge has a pair of pendent tapered lugs" 71-71 adapted for seating within ta ered sockets 51-51 in the adjacent ends 0 the grate bar 5, to thereby fixedly hold the said bar 6 down upon the allet flan s 30-30.

At the opposite -si es of the tapering lugs 71-71, the lower edge of the bar 7 has tapered sockets 72, three of such sockets being provided and made of sufiicient width to allow the bearing faces of the movable grate bars 6' to move therebetween, when the pallet assumes the turned over gpsition, as indicated in Fig. 6, the slots eing tapered in such a manner to allow plenty of lay for the movable grates.

To provide a close fitting of the connecting bar 7 and also for holding the end grate bars as an integral art 0 the complete ate structure, so t at, under expansion and contraction, all of the grate members move to ther, the opposite ends of the con necting reason f the In -like extensions 7 3-7 3 that fit down into o -sets 40-40 in the ends of the bars 4-4, which ends are also beveled, on their top surface, as at 41, forthe close fitting of the tapering edges of the end sockets into which the outermost ones of the movable bars enter, as the drop from between their adjacent end an fixed grate members.

One .of the "essential features 1n my grate construction, is the means for holding the specified grate bars from expanding irregularly and for such purpose, each of the fixed and the end grate bars, which relatively fixed bars, at the opposite sides of their ends have vertical ribs 9 that taper from the wi est or head ortion at the top face of the grate, to a ,-sha e endin at he bottom of, the bar and t 0 said 11 s 9 the fastening other side.

ar are of greater depth than the fixedly latter are also on the said bars 4 and 5' are adapted for extending into like shaped vertical grooves 10-10 on the adjacent edges of the movable bars 6, the tapered form of the ribs 9 and the ooves 10 permitting of free movement of t e bars 5 with respect to the other bar and reduces frictional binding of such parts.

By providing positive contacting points between all 'of the grate bars that constitute the complete set of grate bars and arranged in the manner described and shown w an the grate irons begin to expand, un er the heat of the furnace, causes the entire pallet (all of the parts thereof being relatively in contact) to expand the same way and thereby reduces to the minimum danger of the grate irons expanding in different directions, the closing of the slots at one side and excessive widening of other slots at the The means for holding the several grate bars in proper operative position on the pallet flanges 30 (the connectin bar 7) is such that the removal of the said ars is renders simgle and may be quickly effected and also ran ers it very convenient for removing and re lacing a grate bar, when necessary.

rom the foregoing description taken in connection with the accompanying drawings, the complete construction, the manner of use and the advantages of my invention, it is believed, will be readily apparent to those skilled in the art to which my said invention relates.

What I claim is:

1. In a grate for ore carriers or pallets, a series of relatively fixedly held grate irons and other grate irons coiiperative with the held irons and movably mounted to the said fixedly held irons a limited outward drop relafixedly held arms, as the pallet tively to the or carrier is inverted.

a pallet frame 2. In combination with having an inwardly extended bearing flange along each of its ends; of a grate construction that comprises, a number ofrelatively held bars and a movable bar located between each pair of adjacent fixedly held bars and means along the ends of the pallets for limitin the outward movement of the said movab e grate bars as the pallet assumes a turned over position. 1

3. In an ore carrying pallet for sintering machines, the combination with a bearing flange along each of the opposite ends of the pallet frame; of a series of alternately disosed relatively fixedly held grate bars havmg their opposite ends shaped torest upon 7 the aforesaid flanges, other grate bars inter- 12B mediate the relatively fixedly held bars havin their ends shaped to rest upon the said en flanges of the allet frame and having movement outwar l with. respect to the said relatively fixed y held grate bars, and 180 III A bottom 'medlate grate bars and the ad means attachable to each of the pallet ends adapted for engagement with the endsof the several relatively fixedly held bars and provided with stop portions for limiting the outward thrust of the movable bars, as the pallets assume a turned. over position.

4. In a sintering machine pallet, a grate that constitutes the bottom of the pallet, the said grate being composed of pairs of relatively fixedly held grate bars and other bars, one of said other bars intermediate each pair of the relatively fixedly held bars, the said other bars having movement vertically between the said fixedly held bars, as the pallet assumes the turned over position, and means on each of the opposite ends of the pallet for limiting the outward drop of the said movable bar and for holding the other bars to their relatively fixed position.

5. In a sintering machine pallet, a grate including a series of relatively fixedly held bars and a series of other bars intermediate the relatively fixedly held bars, the said intermediate bars having vertical movement between the other bars, as the pallet turns over, the said movable and fixedly held bars havin relatively slidable contacting portions at tfie opposite edges at each of their opposite ends for the purpose stated.

6. In a ate construction for sintering machine pa lets, the combination with the pallet frame having an inturned bearing flange along the opposite sides and ends, a air of end grate bars that engage the sidg and end portions of the pallet flange, a plurality of intermediate grate bars whose opposite ends terminate in narrow extensions for resting upon the opposite flanges at the opposite ends of the pallet, other grate bars between each pair of the intermediate grate bars and between the interjacent end bars, the said intermediate bars having reduced end extensions for restin on the end flanges of the pallet frame, an connecting bars removabl attachable one to each pallet end, the said bars having their lower edge shaped for positively engaging the end extensions of the end and t e intermediate bars, whereby to fixedly hold the said bars onto the pallet flange bearin portions that t and provided with socket of the aforesaid over the end extensions other bars between the fixedly held her, whereby to rovide for alimited outward movement 0? the said other bars between their adjacent bars for dislodging clinkers and the like, as the pallets assume their turned over position.

7 A grate construction for sintering machine pallets, comprising two end bars, two fixed bars, a movable bar between each end and an adjacent fixed bar, another movable bar between the fixed bars and means for chine pallets,

securing the several bars in their fixed and movable relation within the pallet frame, the said means comprising an internal bearing flange along each of the opposite ends of the allet frame, and a connecting bar remova 1y attachable to each end of the pallet frame with the lower edge sitively enga d with the end and the dyed bars and aving socket ortions that fit over {)he adjacent ends of each of the movable ars.

8. A grate construction for sintering ma: chine pallets, comprising two end bars, two fixed bars, a movable bar between each end and an adjacent fixed bar, another movable bar between the fixed bars and means for securing the several bars in their fixed and movable relation within the pallet frame, the said means comprising an internal hearing flange along each of the opposite ends of the allet frame and a connectin bar remova ly attachable to each end 0% the pallet frame with the lower edge positively engaged with the end and the fixed bars and having socket portions that fit over the adjacent ends of each of the movable bars, and means tending to constantly hold all of the grate bars in edgewise, contact with each other and with the pallet frame to thereby cause the entire pallet to expand together.

9. A grate construction for sintering macomprising two end bars, two fixed bars, a movable bar between each end and an adjacent fixed bar, another movable bar between the fixed bars and means for securing the several bars in their fixed and movable relation within the allet frame, the said means comprising an internal bearing flange along each of the opposite ends of the allet frame and a connectin bar removalily attachable to each end 0 the pallet frame with the lower edge ositively engaged with the end and the fixed bars and having socket portions that fit over the adjacent ends of each of the movable ha and means tending to constantly hold all of the-grate bars in edgewise contact with each otherand with the pallet frame and thereby cause the entire pallet to expand together, the said means including tapered ribs and coenga 'ng grooves along the meetof the first series of bars to dislodge the contents of the pallet.

ate construction for sintering adapted to be moved bodily out o the plane 11. In a sintering machine wherein is provided a series of allets and means for moving said pallets in a train through a continuous path and inverting the pallets 5 to discharge the load, a set of pallet grates for each pallet, each comprising a set of fixed bars and a set of movable g ate bars and means for limiting the motion of said movable bars to a direction substantially at right angles to the plane of the grate to 1) thereby dislodge the contents of the pellets upon 1nversion thereof AUGUST L. LARSON.

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