USRE15787E - larson - Google Patents

Description

3 Sheets-Sheet 1 xw Q A. LARSON SINTERING MACHINE GRATE Original Filed Aug.

March 4, 1924.

March 4 1924.

A. 1.. LARSON SINTERING MACHINE GRATE s Shets-Sheet 2 Original Filed Aug.

'hmia: 1Q LLmesa/Y.

March 4, 1924.

A. L. LARSON SINTERING MACHINE GRATE Originai Filed Aug. 20. 1920 5 Sheets-Sheet 5 Reisaued Mar. 4, 1924.

UNITED STATES PATENT OFFICE.

AUGUST L. LARSON, OF IIELLOGG, IDAHO, ASSIGNOR TO COE'UB DALE'NE HARDWARE AND FOUNDRY COMPANY, OF WALLACE, IDAHO, A CORPORATION OF IDAHO.

SINTERINGFMACHINE GRATE.

Original 80. 1,873,820, dated April 5, 1921, Serial No. 404,776, filed August 20, 1920. Application for reissue filed March 81, 1923. Serial No. 829,180.

To all whom it may concern:

Be it known that I, AUoUsT L. LARSON, a citizen of the Dominion of Canada, residing at Kellogg, county of Shoshone, State of Idaho, have invented certain new and useful Improvements in sintering-Machine Grates, of which the following is a specification.

This invention has relation to improvements relating to what is known as Dwight l0 & Lloyd sintering machines and more particularly has reference to improvements to that form of grate mechanism embodied in the resent ractical application of sintering mac ines oi the type mentioned, known as the Stewart grate construction, and my invention is specifically directed to the improved arrangement of the grate bottoms of 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 her, as high as forty-two individua pallets or carriers that travel along endless ways with the ore contained therein which are subjected, during a part of their travel, to

the desulfurizing and sintering operation,

after which, in the return movement and inverted osition, the loads of treated ore con- 39 tained m the said individual pallet are discharged, the empt pallets traveling back to be again convey to their uppermost posi tion to be again recharged.

In the construction of sintering machines 86 of the general type stated, each pallet has a grated bottom whose members are bolted tightly to the pallet sides and as a result of such attachment, when the grates become heated and expansion takes p ace, the grate 40 bars or members do ngt 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 atl interfering with the extraction of t e an furic 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.

so That this defect in the desired or perfect operation of the Dwight 8: Lloyd sintering num-' machine be fully appreciated, it should be stated, by the improper expansion of the grate irons (and by the im r0 er expansion is meant that the heat of t e urnace causes the grate members to expand in different directions) which results in the grate slots becoming tight on the one side and leaving too muc space at the other side, and since the ore in the traveling pallet is usually crushed fine, it (the ore) naturally passes through such widened grate slots, often necessitating the shovelin of tons of the wasted ore back into the %)ins to, be again carried through the roasting process. v

Primarily, my invention has for its object to provide a grate construction for pallets of sinterin machines, which is selfcleaning and which practically overcomes the improper expansion of the ate 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 invention is the provision of a grate construction for sinterin machine pallets or ore carriers, in whic the grate members are particularl desi ed for being economically made, easi y a i ed for use, and employed to a greater a vantage in a number of respects than can be present in the construction of grate bottoms of the character referred to and used in ore treating apparatus.

The preferred embodiment o my invention is illustrated in the accompanying drawings in which suflicient portions of a sintering machine are represented as is necessary to illustrate a practicalapplication of my invention and in which:

Figure 1 is a side elevation of a portion of a sintering or ore roasting machine, several of the pallets or carriers being shown in operative position.

Fig. 2 is a diagrammatic sectional view, which illustrates a number of oreloaded allets positioned as passing across the ore ox of the sintering machine.

Fi 3 is a detail cross section taken on the hne 3-3 of Fig. 2.

Fig. 4 is a plan view of a pallet with my improved construction etiuippetg o gra bottom.

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

Fig. 6 is a view similar to Fig. 5, the pallet being shown at a reversed or dumplng position and the movable grate irons at their shifted osi tion for effecting the self-cleanin of t e iron.

Fig. 7 is a perspective view of one of the end grate bars.

Fig. 8 is a similar view of one ofthe movable grate bars.

Fig. 9 is a perspective view of one of the stationary grate bars.

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

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

As before stated, my improved grate construction is especially designed for constitut ing the'bottom of pallets or carriers that form an essential feature of the Dwight & Lloyd types of sintering machines and that the 0 erative arrangement of such pallets and their grate construction be readi y understood, a sintering machine of the kind stated is diagrammaticall illustrated in Fig. 1 of the drawings an 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 whic 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 arranged to support and direct the series of pallets or carriers 3,

which serve as the su porters for the ore durin the roasting an sintering operation. It s iould be stated, the pallets, in ractice, are caused to move slowly in the irection indicated by the arrows a, the'means for effecting such direction of movement of the pallets for feeding the ore to the said pallets and for igniting the ore, after being delivered to the pallets, being readily understood by those familiar with the use of sintering machines of the type mentioned by referring to Fig. 1, it being also understood 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, overturningat such point to discharge whatever load they may carry, one of the pallets being shown positioned at the discharge point in Fig. 1 and another indicated as returning down the inclined way toward the other end for being again carried up in position for reloading in the same figure. The general arrangement of a number of pallets or carriers, their rates and the man nor of sustaining such pa lets on their guides causing a percentage of the ore to pass through without having the gases properly extracted, the said connecting bars usually requiring six bolts for securing them in place, thereby causing some inconvenience, when it is necessary to remove or replace a grate iron.

Referring 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 grate bars.

The grate bottom, as shown, comprises two fixedly held end grate bars 44, two intermediate fixed grate members 55, three movable grate bars 66-6 and two connecting bars 77, 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 66 are located between a fixed bar and an end bar at their respective sides of the pallet frame, as is best shown in Figs. 2, 4, 5, and 6.

The end bars 4, asalso the intermediate or fixed grate members 6, are of like construction, one of each of the said end bars, the movable bars and the intermediate fixed 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 ends, the movable and the fixed grate bars are tapered to allow for a certain amount of play of the movable bars suflicient when the pallet reaches the turning over or d scharging position, shown in Fig. 6, for dumping the ore, that the jars cause the movable bars to shake in such 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 bet-ween the several grate bars are sel -cleaned and. as the movable bars 5, in )ractice, fall the distance of about one-half an inch, provides for forcing any ore on the grates, in the form of clinkeis, out of the grate slots, the ore falling into the proper bin.

In my construction of grate, the several bars 4, 5. and 6 have their ends peculiarly shaped for cooperating with the eoacting edges of the connecting bars that hold the several bars 4, 5, and 6 down onto the inturned angled flanges 30 of the pallet frame and, in my grate construction, there are two of such connecting bars 7, one for each end of the pallet box or frame and for engaging with their respective ends of the grate bar.

Each connecting bar 7, one of'which is shown in detail in Fig. 10, is of suflicient length to extend across the full width of the pallet box (see Fig. 4) and it has three bolt holes 70-70-70 for receiving the fastening bolts 8 and each bolt hole is elongated vertically for adjusting the bar 7 to allow for a proper fitting o the connecting bar in connection with the several fixed grate ars.

The lower edge of each connecting bar 7 is shaped for effecting a simple and easily fitted adjustment with the eculiarly shaped ends of the several grate ars 4, 5, and 6 and for such purpose, the said lower edge has a pair of pendant tapered lugs 71-71 adapted for seating within tapered sockets 51-51 in the adjacent ends of the grate bar 5, to thereby fixedly hold the said bar 6 down upon the pallet flanges 30-30.

At the opposite sides of the taperin lugs 71-71, the lower edge of .the bar has tapered sockets 72, three of such sockets being provided and made of sufficient width to allow the bearing faces of the movable grate bars 6 to move therebetween, when the pallet assumes the turned over position, as indicated in Fig. 6, the slots being tapered in such a manner'to allow plenty of play for the movable grates.

To provide a close fitting of the connecting bar 7 and also for holdin the end grate bars as an integral art 0 the complete grate structure, so t at, under expansion and contraction, all of the grate members move together, the opposite ends ofthe con-" nee-ting bar are of greater depth than the other parts there0f,'by reason of the luglike' extensions 73-73 that fit down into off-sets 40-40 in the ends of the bars 4-4,

which ends are also beveled, on their top surface, as at 41, for the close fitting of the tapering edges of the end sockets into which the outermost ones of the movable bars enter, as they drop from between their adjacent end and fixed grate members.

One of the essential features in my grate construction, is he means for holding the specified grate bars from expanding irregularly and for such purpose, each of the fixed and the end grate bars, which latter are also relatively fixed bars, at the opposite sides of their ends, have vertical ribs 9 that taper from the widest or head portion, at the top face of the grate, to a V- iaped ending at tbe'bottom of the bar and the said ribs 9 on the said bars 4 and 5 are adapted for extending into like shaped vertical the other side.

grooves 10-10 on the adjacent edges of the movable bars 6, the tapered form of the ribs 9 and the grooves 10 permitting of free movement of the bars 5 with res t to the other bar and reduces frictional, inding 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, when the grate irons begin to expand, under 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 means for holding the several gra bars in proper o erative position on the pallet flanges 30 (t e connectin bar 7) is such that the removal of the said %ars is rendered simple and may be quickly-effected and also renders it very convenient for removing and replacing a grate bar, when necessary.

While this description is directed to a grate for the Dwight & Lloyd type of sintering apparatus, my improv grate is equ'ally' useful in an intermittent type of apparatus wherein the sinterin pan is rotated about its own axis. Furt ermore, my invention need not be restricted to the s cific grate herein described, since any rel tive movement of the grate bars resulting in a distortion of the grate surface is broadly contemplated. It follows from the foregoing that the distorting of the grate surface,'or the bringin of different portions of said surface into ifl'erent planes so as to destroy the evenness of that surface with the dumping of the pan, or treatment vessel, constitutes the principal feature of my invention.

Having described my invention, I claim:

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

2. In combination with a pallet frame having an inwardly extended bearing flange along each of its ends of a grate construction that comprises a number of relatively fixedly held bars and a movable bar located between each pair of adjacent fixedly held bars and means along the ends of the pallets for limiting the outward movement of the said movable (grate bars as the pallet assumes a turne over position. I

3. In an ore carrying pallet for sintering machines, the combination with a bearing flange 'aI ngeachpitheopposite endaofitlge pallet-f ame; afsi ri .ietsa tema e y dis: posed-relatively fixedly @l'ield- ,grateiharswhav ing their Opposite endssliaped.;t;o; res t;upon the-aforesaid flanges, other; grate ba-rs :intermediate the relatively fixedly held,- bars having their ends; shaped -.to-rest ;upo the said end flanges of the pallet-frame and having-movement outwardly ,withresjpectf to the said relatively fixedly held grate bars, and means attachable to each-ofthepallet ends adapted forengagement with the ends of 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 allet, a grate bottom including a series of re atively 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 having relatively slidable contacting portions at the opposite edges at each of their opposite ends for the purpose stated.

6. In a grate construction for sintering machine pallets, the combination with the pallet frame having an inturned bearing flange along the opposite sides and ends, a pair of end grate bars that engage the side and end portions of the pallet flange, a plurality of intermediate grate bars whose opposite ends terminate in narrow extensions for resting upon the op osite flanges at the opposite ends of the pal et, other rate bars tween each pair of the interme iate grate bars and between the intermediate grate bars and the adjacent end bars, the said intermediate bars having reduced end extensions for resting on the end flanges of the pallet frame, and connecting bars removably attachable one to each pallet end, the said bars having their lower edge shaped for positively engaging the end extensions of the end and the intermediate bars, whereby to fixedly hold the said bars onto the pallet flange bearings and provided with socket portions that fit over the end extensions of the aforesaid other bars between the fixedly held bar, whereby to rovide for a limited out-ward movement 0? the said other bars ole-1a be ween their djac nt: bars for-- di dgi g elin-ker's :andjthe like, asthe pallets assume theirturned nav l;'p-eaitio 7. Aagrate construction for sintering machine pallets, comprising.two end bars, two fixed bar-s,,a--Ino-vable bar between each end and an adjacent fixed bar, another movable bar betweenthe fixed bars and means for securing the several barsin 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 pallet frame, and a connecting bar removably attachable to each end of 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. 8. 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 securing the several bars in their fixed and movable relation within the pallet frame, l

the said means comprisino' an internal bearing flange along each of the opposite ends of the pallet frame, and aconnectin bar re- Dvably attachable to each end 0 the pal let 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 machine pallets, comprising two end bars, two fixed bars, a movable bar bet-ween 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 connecting bar removab y attachable to each end of the pal let 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 and thereby cause the entire pallet to expand togather, the said means including 't-apered' ribs and coengaging grooves along the'meeting edges of each pair of grate bars, whereby constant contact between the several movable and fixedly held bars is maintained, as the movable bars work outward passes to the ore umping position.

10. In a grate construction for sintering machine pallets, the combination with the pallet frame and a set of relatively fixed grate bars, of a second set of ate bars adapted to be moved bodily out 0 the plane of the first series ofbars to dislodge the contents of the-pallet.

11. In a sinterin machine wherein is provided a series of a lets and means for moving said pallets in a train through a continuous path and inverting the allets to discharge the load, a set of pal et grates for each pallet, each comprising a set of fixed bars and a set of movable grate 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 thereby dislodge the contents of the pallets upon inversion thereof.

12. In combination with a treatment vessel, a grate presenting a substantially even surface for the support of the charge to be treated, said vessel being tiltable for dumping the charge, and means for causing-a distortion of the charge-supporting surface of the grate with adumping movement of the vessel.

13. In combination with a treatment vessel tiltable in a vertical plane about a fixed axis, a grate presenting a substantially even surface for the support of the charge to be treated, and means for causing a distortion of the charge-supporting surface of the grate with a tilting of the vessel to dumping position.

14. A grate of the character described, comprising a series of component members forming a support for the charge, and means for ermitting a member to participate in a limited outward movement from its normal position of rest.

15. In a grate of the character described, comprising a series of component members forming a support for the charge, and means for permitting a member to partici pate in a limited outward movement in a direction transverse to the supporting surface of the grate.

16. A grate of the character described, comprising a series of component members collectively presenting a normally horizontal supporting surface for the charge, and means for permitting a member to participate in a limited vertical outward movement. a

17. A' grate of the character described, comprising a series of component members collectively forming a support for the charge, said grate being provided with openings for the passage of gases, and means for permitting a miember to participate in a limited outward movement in a direction transverse to. the supporting surface of the grate.

18. A grate of the character described,

mounted to be inverted for dumpin comprising a series of grate-bars spaced suitable distances apart to form grate openings, means for supportin the bars, and means for permitting a pre etermined number of the bars to participate in alimited outward movement in a direction transverse to the supporting surface of the grate.

19. In combination with a sintering pan rotatable in a vertical plane for dumping the charge treated, supporting means positioned beneath the charge during the period of treatment, said supporting means participating in a limited downward movement to break up and dislodge any sintered material adhering thereto upon rotation of the pan to dumping position.

20. In combination with a sintering pan tiltable in a vertical plane for dumping the a charge treated, a support for the char and means for causing said support to shift its position within suitable limits with a dumping movement of the pan, in a direction operating to release any sintered material adhering to the support.

21. In combination with a sintering pan mounted to be inverted for dumping the treated charge, a series of supports for the charge, and means for causing a predetermined portion of said supports to become dis laced from their normal positions of rest wit an inversion of the .pan, said dis lacement being in a direction operating to leak up and release any sintered material adhering to said supports.

22. In combination with a sintering pan tiltable'in a vertical plane for purposes of dumping, a grate for supporting the charge during treatment, said grate-having component parts capable of a limited vertical movement, and means cooperating with said parts to cause a vertical outward displacement thereof from their normal positions of rest with a dumping movement of the pan, thereby dislodgmg and breaking up any. sinter adhering to the grate.

23. In combination with a grate-bar, a suitable su port for the bar, and cooperating means etween the bar and its support for causing the bar to drop a certain distance with an inversion of the bar and its support.

24. In combination with a sintering pan the treated charge, supporting means positioned beneath the charge during the period of treatment, said supporting means participating at different points in a limited downward movement to break up and dislodge any sintered material adhering thereto, upon the tilting of the pan to dumping osition.

25. In combination with a tiltab e treatment vessel, a grate member positioned to support the charge and being at rest during the treatment of the charge, and means for causing said member to drop through a limited distance away from its normal position of rest, with a dumping movement of the vessel.

26. In combination with a tiltable treatment vessel, a perforated support'for the charge, and means for causing different portions of said support to drop through a limited distance away from their original positions of rest with a dumping movemen of the vessel.

27. In combination with a tiltable sintering pan, a grate comprising a plurality of independent members for supporting the charge, and means for causing a portion of the members to participate in a limited downward displacement from their original supporting positions with a dumping movement of the pan.

28. In combination with an open top; sintering pan rotatable about a fixed axis for dumping, a grate com risinga plurality of bars spaced apart ant collectively presenting an even supporting surface to the charge resting thereon, and means for causing a portion of the bars to participate in a limited drop with a dumping movement of the pan;

29. In a tiltable treatment vessel, a grate comprising a plurality of members spaced apart, and means for imparting to any predetermined number of the members a llmited outward displacement in a directlon tranverse to the charge-supporting surface of the grate with a dumping movement of the vessel.

30. In combination with a treatment vessel tiltable in a vertical plane, a grate member participating in a limited outward movement or drop with a tilting of the vessel to dumping position.

31. In combination with a tiltable treat ment vessel, a grate comprising a series of component members forming a support for the charge, and means for causing a member to'participate in a limited outward movement from its normal position of rest with a tilting of the vessel to dumping position.

Signed this 24th clay of March, 1923.

AUGUST L. LARSON.

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