US2322873A - Grate bar for sintering machines - Google Patents

Description

Jun 29, 1943. w. 'H. MORIARTY 2, ,73-

GRATE BAR FOR SINTERING MACHINES Filed March 4-, 1941 I 3 Sheets-Sheet 1 INVEIQTOR Wilson H. Ifrianjy aw )8 w ATTORNEY June W.H. MQRIAR Y 2,322,873

GRA'I'E BAR FOR SINTERING MACHINES I Filed larch 4, 1941 :s Sheets-Sheet 2 INVENTOR Elsa/z lfglofirty ATTORNEY June 29, 1943. w, o m-y 2,322,873

GRATE BAR FOR SINTERING MACHINES Filed March 4. 1941 I s Sheets-Shet :5

/:m m V cm m3 /3%: /I/Z g 2 INVENTOR ATTORNEY Patented June 29, 1943 GRATE BAR- FOR SINTERING MACHINES Wilson. H. Moriarty, Shaker Heights, Ohio, as-

signor to NationalMalleable and Steel Castings Company, Cleveland, Ohio, a corporation of Ohio Application March 4, 1941, Serial No. 381,643

1 Claim. (01. 263-28) This invention relates to sintering machines and more particularly to the pallets and the grate bars therein.

In the operation. of sintering machines there arises the problem of effectively discharging all of the sintered material from the pallets. cordingly, it is the main object of my invention to provide the pallets of the machine with a grate which during the course of travel of the pallets at the discharge end of the machine will effectively loosen the sintered material from the grate. A more specific object is to provide a grate for the pallet of a sintering machine in which the grate bars thereof are adapted to be displaced different amounts and in different directions with respect to the pallet as the latter moves from upright to upside down position during the discharge operation. A more particular object is to provide a new and improved grate bar which is adapted to be mounted in the pallet in such a manner that the ends of alternate bars will drop vertically from the pallet distances different from the ends of the intermediate bars. A further object is to provide a grat bar the ends of which may drop unequal distances from the pallet, the means enabling such movement ing ends drop unequal distances from the pallet during the discharge operation, will also drop or slide unequal amounts with respect to the pallet in a direction longitudinally of the bar.

Other objects and advantages of my invention will be apparent from the following description, taken in conjunction with the drawings, in

which:

Figure 1 is a plan view of the pallet of a sintering machine with grate bars mounted thereon in accordance with my invention.

Figure 2. is a longitudinal vertical sectional View, taken on line 22 of Fig. 1.

Figure 3 is a diagrammatic view of a sintering machine, showing the path of travel of the pallets therein.

Figure 4 is a transverse sectional view taken on line 4-4 of Fig. 1; and

N Figure 5 is a sectional View, taken along lines 5-5 of Fig.4.

Referring to the drawings, there is shown a pallet I which receives and discharges the material to be sintered. This member may operate on tracks within the sintering machine in the usual manner along an endles conveyor so that at the discharge end of the machine it drops to an upside down position and travels thus until the loading end is reached at which time it is raised to upright position to receive the charge, as is shown in Fig. 3. The pallet frame is comprised of longitudinal side members II and I2, longitudinal intermediate members l3 and I4 and transverse connecting members l and it. Mounted on the longitudinal members are a plurality of like grate bars IT, a plurality of like grate bars Ila positioned between bars H, and two like end bars IS. The bars are all positioned to'extend in the direction of travel of the pallet, thereby permitting av shorter bar and a more flexible grate for the sintering process. The sides of the bars are recessed in a vertical direction so that when the bars are assembled on the pallet, openings 19 and are formed which permit the passage of air and hot gases through the chargeduring sintering. The end openings l9 are tapered so as to be narrower at the ends of the bars to more evenly distribute the blast of air and hot gases over the entire grate surface.

In accordance with my invention the underside of each of bars I! and lia is formed with downwardly extending lugs 45 and 45, and 49 and 50 respectively. These lugs are adapted to underlie the longitudinally extending stops 5| and 52 which may be in theform of bars secured to the longitudinal members l3 andv l4 or they may be cast integral with said members.

In assembling thebars I"! and Ila on the pallet each bar is lowered into the space adjacent the side of either member !-5 or IS, with projections 45 and 45. or 49 and 5!] between longitudinal intermediate members l3 and I4. As the ends of stops 5| and 52 do not extend to members l5 and Hi there is no interference between the stops and lugs 45 and 46 or 49 and 5!! in this position of the bar. The bar may then be moved to the center of the pallet and the rest of bars H or Ila mounted in likemanner. The assembly is completed by adding bars l8, one at each end of the pallet. These bars are held in place by means of pins 29, a limited amount of vertical movement of the bars being permitted by the looseness of the fit of the pin in the pallet. Relative movement of'bars I8 in a direction longitudinally thereof is limited by projections 30 which are adapted to engage members l3 and M. It will thus be clear that during upside down travel of the pallet all of bars are precluded from accidentally dropping out of the pallet.

As shown in Figs. 4 and 5 the stop lugs are so positioned that alternate bars are adapted to move in both vertical and horizontal directions with respect to the pallet, amounts different from the intermediate or adjacent bars. Reference to Fig. 4 will show that lugs 45 and 46 provide for vertical displacement of bar H from the pallet and since lug 45 i closer to stop 5| than lug 46 is to stop 52, the two ends of grate bar ll will move different amounts vertically of the pallet. These lugs are also spaced from walls l3 and M to provide movement of the bar horizontally of the pallet or in a direction longitudinally of the bar. The bar Ila immediately adjacent bar 44 is provided with lugs 49 and 50 which also permit ,vertical movement of the bar away from the pallet. However, these lugs are spaced a lesser amount from walls l3 and I4 than are lugs 45 and 46, and therefore the bar can not move as far horizontally with respect to the pallet as bar 44. It will be apparent that with this arrangement of lugs and stops when the pallet drops to upside down position, each end of bar I! or I la will drop a predetermined distance from the pallet, one and dropping further than the other. Furthermore, by arranging the bars with corresponding lugs of alternate bars I! and Ila aligned, eachend of each alternate bar will drop an amount different from the adjacent end of each intermediate bar. Thus, the corresponding ends of any two adjacent bars will be displaced unequal distances in a vertical direction from the pallet, with the surface of one bar sloping oppositely from the surface of the other in respect to the horizontal. This uneven dropping of the grate surface during the discharge operation will actto effectively loosen the sintered mass and also to break up the material into suitable sizes. It will also be observed that since the retaining lugs are located beneath the rate surface the movement of the bars away from thepallet will not be impeded by any particles of material lodging between the lugs and the stops as may happen if the lugs and stops are positioned above the grate surface. In addition, various combinations of movements of the bars are possible, such as alternating the bars in groups of twos instead of singly so that the two adjacent bars will have their lugs aligned. It will accordingly be clear that by alternating the bars as shown in Figs. 4 and 5,'one set of bars at the discharge end of the machine will move both in the direction of travel of the pallet with respect thereto and away from the pallet in a vertical direction, while the intermediate set of bars will move in the same manner but in dilferent amounts due to the positions of the lugs thereon. As the pallets move upwardly approaching the charging end B of the machine shown in Fig. 3 the bars slide rearwardly on the pallet until lugs 45, 4 6 and 49, 50 all engage one of walls l3 or M, depending on the position of the pallet. As the pallet moves along its path during the discharge operation which takes place at end A of the machine, the bars will first slide in the direction of travel of the pallet as it moves toward a vertical position until the lugs engage the opposite wall l3 or I4 as the case may be. However, since total amount of movement of adjacent bars longitudinally of the pallet is different, lugs 49 or 50 will contact the wall first and the adjacent bars having lugs 45, 46 will move still farther in order to contact the wall. Thus there will be relative movement between adjacent bars in the direction of travel of the pallet. As the pallet continues its movement toward upside down position the bars will drop away from the pallet until the lugs engage stops 5| and 52. The aforesaid relative longitudinal movement between adjacent bars will also occur as the pallet moves upwardly towards the charging end of the machine since the bars will alternately move from one of walls H3 or 14 into engagement with the other of said walls.

The terms and expressions which I have employed are used as terms of description and not of limitation, and I have no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described or portions thereof, but recognize that "various modifications are possible within the scope of the invention claimed.

What I claim is:

In a sintering machine a pallet comprising a pair of side walls extending lengthwise of the pallet and a plurality of grate supporting walls extending transversely of the pallet and joining 5 said side walls, stop members extending along certain of said grate supporting walls and terminating short of said side walls so as to form vertical passages between the ends of said members and said side walls, a plurality of grate bars on said grate supporting Walls each having depending lugs underlying said stop members, said lugs being of lesser thickness than said passages so as to pass through the latter during assembly of said bars with the pallet, said lugs having horizontal and vertical stop surfaces, the horizontal urfaces of the lugs on adjacent bars being spaced unequal distances from the under sides of said stop members and said vertical surfaces of the lugs on adjacent bars being spaced unequal distances from the sides of said stop members so as to provide for unequal movement of said bars away from and longitudinally of said pallet as the latter is inverted, other grate bars engaging said side walls for limiting movement of said plurality of grate bars toward said side walls, and means on said pallet limiting movement of said other grate bars away from said pallet when the latter is inverted.

wILsoN I-I. MORIARTY.

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