US2563135A

US2563135A - Wind box seal for sintering machines

Info

Publication number: US2563135A
Application number: US114490A
Authority: US
Inventors: Harold E Rowen
Original assignee: SINTERING MACHINERY CORP
Current assignee: SINTERING MACHINERY Corp
Priority date: 1949-09-08
Filing date: 1949-09-08
Publication date: 1951-08-07
Anticipated expiration: 1968-08-07

Description

Aug. 7, 1951 Filed Sept. 8, 1949 H. E. ROWEN WINDBOX SEAL FOR SINTERING MACHINES 4 Sheets-Sheet l INVENTOR. fiA/ QAD E ROWE/v Aug. 7, '1951 Filed Sept. 8, 1949 H. ROWEN WINDBOX SEAL FOR SINTERING MACHINES 4 Sheets-Sheet 2 I- l h WA 4 w b 11% INVENTOR. f POM/[N 1951 H. E. ROWEN 2,563,135

WINDBOX SEAL FOR SINTERING MACHINES Filed Sept. 8, 1949 Y 4 Sheets-She et 5 INVENTOR.

HAROLD E. Pom/157v ATTORNEY Aug. 7, 1951 H. E. ROWEN WINDBOX SEAL FOR SINTERING MACHINES 4 Sheets-Sheet 4 Filed Sept. 8, 1949 INVENTOR. fiA/Pom E. ROWE/v Patented Aug. 7, 1951 35 5."? 1-4? SEAL FORSINTERING MACHINES WIND BOX Harold E. Rowen, Stanhope, N.' J., assignor 'to Sintering Machinery Corporation, Netcong, N.J.,a corporation of New Jersey Application September s, 1945, Serial No. 114,490

7Claims. (01.26641) My present invention relates to sintering machines and particularly to improvements in sealing down-draft sintering machines.

In sintering machines of the moving grate'or Dwight 8; Lloyd type, a succession of pallets moves over the upper open end of one or more windboxes into which the products. of combustion of the material onthe pallets is drawn. In order to maintain a sufficiently. low pressure to draw in the draft through the pallets and grates, it is necessary to seal the side edges of the pallets with the side walls of the windbox.

In the constructions heretofore used for this purpose the seals between the moving pallets and the wall of the windbox were exposed to the hot gases within the windbox with the result that it was difficult in practice to maintain a satisfactory seal.

In my present invention I provide a sealing means between the moving pallets and the walls of the windbox which is protected from the hot .gases so that an effective seal may be easily maintained and protected against deteriorating action of the heat within the windbox.

In my present invention I provide flanges depending from the pallets and spaced slightly within the upper edge of the side walls of the windbox so that there is a space between the depending flange and the wall of the windbox.

' On the upper edge of the side wall of the windbox I provide a bearing bar or hearing bars extending lengthwise of the direction of the travel of the pallets.

Mounted on the pallets outside of their depending flanges or hubs are wearing bars which rest on the bearing bars of the windbox wall.

A means is provided for supplying a lubricant to the bearing surface of the bearing bars so that the wearing bars of the pallets may slide easily on the bearing bar of the windbox and form a substantially airtight seal.

The shape of the bearing surface of the bearing bars and of the wearing bars may be either horizontal or inclined with the inclination of one side wall being reverse to that of the other, or they may be grooved with the side edges of the grooves inclined and with the wearing barsof the pallets complementarily inclined.

The full weight of the pallets need not be supported on the bearing bars but may be supported on rails spaced outside of the windbox on which wheels carried by the pallets may run. And in this .case the bearing bars are pressed upwardly against the wearing bars of the pallets with a uniforinpressure. For this purpose the bearing bars may be supported on weighted levers.

The pallets after moving beyond the windbox run on a curve to inverted positions to be returned vto the; opposite end of the sintering maehine to again pass over the windbox. The-pallets are provided with hubs or projecting parts at their lower corners which bear against eachother in passing about the return curve. I

The wearing bars are spaced upwardly from the hub so that as the pallets turn to inverted position the wearing bars between successive pallets move away from each other and thus escape injury as the pallets roll about the curved track.

The various features of my invention are illustrated, by way of example, in the accompanying drawings in which a e Fig. 1 isa vertical, section taken through line ll of Fig. 2 of a sintering machine embodying a preferred form of the invention; v V v Fig. 2 is a side elevation of the sintering ma chine shown in Fig. l; H e Fig. 3 is a vertical section of a part of a palle and side wall of a windbox showing the relationship of the bearing and wearingbars forming the seal in relation to the other parts of the sintering machine; I 1

Fig. 4 is a similar section taken immediately beyond the windbox and showing the manner of sealing the successive pallets as they-leave the windbox;

Fig. 5 is a view similar to, that of Fig. 3 showing a modification inwhich the bearing-bar isv pressed upwardly by a weighted lever; V a

Fig. 6 is a view similar to that of Fig.4 of the modification shown in Fig. 5; I I

Figs. 7 and 8 are sectional and. side views respectively of a portion of the sinterin machine showing the relationship of the wearing and bearing bars to the hub of the pallets; v

Fig. 9 is a diagrammatic view on a smaller scale showing the relationship of the hubs andbearing bars as the pallets move about a curve to inverted position;

Fig. 10 is a cross-section similar to that of Fig. 3 showing inclined bearingand wearing surfaces,

and

Figs. 11 and 12- are respectively diagrammatic end and side views showing a grooved form of bearing bar. a

In the embodiment of the invention shown in the accompanying drawings, the invention may be applied to a conventional type of windbox I5 supported on a suitable framework 16 and. having an outlet I! for gases and an outlet 18 for separated dust. I

The upper end or top of the windbox is; closed by pallets H! which pass over the' upper end of the windbox each in contact with the next to form a substantially solid moving cover on which the sintering grates are mounted.

The pallets move in the usual way over the upper ends of the windbox, then come in a reverse curve onto rails below the windbox to again be brought to erect position at the opposite side of the sintering machine and again pass ver the latter.

The pallets are provided at their opposite sides with wheels 2| to engage the rails 20.

The construction of the pallets and of the sealing means is shown more particularly in Fig. 3, and inFig. 4. As shown in these figures the pallet comprises a framework '22 on which the grates (not shown) are supported and which has at each side a hub comprising a wall 23 extending a distance above the frame 22 and a depending wall 24 extending somewhat below the grate supporting frame. A flange 25 extends outwardly from the side wall 23 somewhat above the lower edge of the hub. On the lower surface of the flange 25 is mounted a wearing bar 26 of hard steel secured to the flange 25 by countersunk screws.

The wearing bar 26 of each successive pallet is supported on a bearing bar 21 which extends continuously the length of the windbox and is mounted on a block 28 secured by means of angle irons 29 and 30 to the side wall 3! of the windbox.

It will be understood that the pallets move in continuous succession and direct contact. The successive wearing bars 26 of the pallets will form a substantially continuous bar as they pass over the windbox.

To lubricate the relatively moving surfaces of the wearing and bearing bars the latter are provided at regular intervals with lubricating passages 32 through which lubricant may be injected to the upper surface of the bearing bar.

It will be apparent that the bearing bars and wearing bars are shielded by the lower part 24 of the hub from the hot gases passing into the windbox. This enables these parts to be kept lubricated and free from the destructive action of high temperatures of the windbox gases.

As the pallets pass from the windbox access of air across the width of the windbox is prevented by providing a dead plate 33, Fig. 4, of a dimension in the direction of movement of the pallets somewhat greater than the corresponding dimension of the pallets and positioned so as to bear closely against the under surface of the frame. This insures that no air will pass into the windbox through this transverse dimension except through the top grate supporting part of the pallet.

The dead plate 33 has a downward extension 34 and an outward extension 35 below the lower surface of the hub and sealing "to the support block 28. The lower part of the hub is widened as at 36 so that at the ends of the pallet the space is closed between the hub and the s'up- V NM.

In the modification shown in Figs. 5 and 6, a part of the weight is supported outside of the windbox on rails 38 extending in the direction of travel of the pallets and supporting the wheels 2 I. In this case the bearing bar 21 is pressed upwardly against the wearing bar 26 by means of a tilting lever 39 pivoted at 40 on the framework, from one end of which depends a weight 4|. The other end of the lever bears upwardly against a sliding plate 42 slidably bolted onto an angle iron 43 mounted on the upper end of the windbox wall 3|. The bearing bar 21 is, therefore, forced upwardly against the Wearing bar 26 by the weight 4|, thus taking but a part of the weight of the pallet and providing a uniform pressure regardless of the weight of the pallet or its material to be treated.

With this construction, as shown in Fig. 6, a dead plate 44 supported by a beam 45 extends in contact with the lower surface of the pallets l9, thence under the lower end of the hub in an extension 46 thereby filling the space between the hub and the supporting bearing bar.

As shown in Figs. 7 and 8, the lower part 24 of the hub is widened and extended downwardly as at 41. As the pallets move about a curve to bring them onto the lower supporting rails 20, as in Fig. 9, the pallets contact only at the rounded ends 41 of the hub.

As the hub is below the level of the wearing bar, the bearing bars of successive pallets separate and do not come into contact again until the pallets are supported on the rail 23, or until they are brought to their upright position to pass over the windbox. This preserves the wearing bar from injury as the pallets pass from the working position to return position.

In the modification shown in Fig. 10 the bearing bar 21 and wearin bar 26 are slightly inclined to the horizontal. The wearing and bearing bars on the opposite side of the pallet will also be inclined but in the reverse direction so as to center the pallets automatically in position on the windbox. The lubrication would be the same in this case as that shown in Fig. 3.

In the modifications shown in Figs. 11 and 12, the wearing and bearing bars are made of an angle or curved shape to hold the pallets aligned in their travel. In this case the bearing bar may be lubricated by means of recesses 48 in which lubricant may be contained and having rotating wheels or rollers 49 to bring the lubricant into contact with the wearing bar.

Through the above invention I have provided a seal which is protected against the hot gases in the windbox and which may be readily lubricated.

Having described by invention, what I claim is:

1. A sintering machine having a wind box open at its upper end and comprising side walls and bearing bars one one each side wall, pallets movable in succession over the upper open end of the Wind box, said pallets each having a wearing bar at each side and slidably bearing on the bearing bar at its respective side, said pallets having depending side flanges one at each side spaced inwardly of and extending downwardly below the contacting surfaces of the bearing and wearin bars.

2. The sint'ering machine of claim 1 having a lubricating means in said bearing bar to supply lubricant to the bearing surface of said bar.

3. The sintering machine of claim 1 in which the bearing surface of the bearing bar on one side of said windbox is inclined transversely of '5 said windbox and in which the wearing bar on the opposite side thereof is inclined transversely in the opposite direction and in which the wearing bars of said pallets are inclined on their respective sides to the inclination of their respective bearing bars.

4. The sintering machine of claim 1 in which each bearing bar has a longitudinal groove diverging upwardly and in which the wearing bars have complementary surfaces to the sides of said 5. The sintering machine of claim 1 in which a Weighted lever presses the bearing bar upwardly against the wearing bar of its respective pallet and in which said pallets have supporting means extending beyond said bearing bar.

6. A sintering machine having a Windbox open at its upper end and comprising side walls and bearing bars one for each side wall and movable vertically relative to its respective side wall, means for resiliently pressing said bearing bars upwardly, pallets movable in succession over the upper open end of said windbox, said pallets each havin a wearing bar at each side slidably bearing on the bearing bar at its respective side of said windbox and having extensions sidewise beyond said wearing bar, said extensions having supporting rollers, a supporting rail for said rollers at each side of said windbox, said pallets having depending side flanges one at each side spaced inwardly of and extending downwardly below the contacting surfaces of said bearing and wearing bars.

'7. The sintering machine of claim 1 having a dead plate at theend of said windbox transverse to the direction of movement of and in position to contact with the lower surfaces of said pallets as they pass thereover and extending beneath and in contact with said depending flanges to said wearing bar to seal the ends of said windbox, said flanges of said pallets being widened at their front and rear ends to seal the space between said flanges and said bearing bar.

HAROLD E. ROWEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,468,206 Klugh Sept. 18, 1923 1,491,778 Stehli Apr. 22, 1924 1,774,135 Fassotte Aug. 26, 1930 2,070,300 Smith Feb. 9, 1937 FOREIGN PATENTS Number Country Date 748,413 France Apr. 18, 1933 585,367 Germany' Oct. 10, 1933 Certificate of Correction Patent No. 2,563,135 August 7, 1951 HAROLD E. BOWEN 1 It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 4, line 61, for one, second occurrence, read on;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 29th day of January, A. D. 1952.

THOMAS F. MURPHY,

Assistant Commissioner of Patents.