US2174338A - Grate for sintering machines - Google Patents

Description

P 25, 1 M. F. WARNER 2, 4,338

GRATE' FOR SINTERING MACHINES Filed Aug. 4, 1938 2 Sheets-Sheet l Sept. 26, 1939. M, WARNER I 2,174,338

can]: FOR SINTERING MACHINES Filed Aug. 4) 1938 2 Sheets-Sheet 2 Patented Sept. 26, 1939 UNITED STATES PATENT OFFICE GRATE FOR SINTERING MACHINES Application August 4, 1938, Serial No. 223,108

6 Claims.

10 the sintering operation the surface of the grate is liable to become incrusted with material in process which becomes cemented by fume which, upon slight cooling, adheres to the surfaces of the parts and tends to obstruct the air passages. It is 15 essential that this obstructed incrustation shall be removed. If this incrustation is removed by hand, it results in annoying delay and expense, and accordingly provision has heretofore been made in the prior art to supply a pallet designed 20 to be self-cleaning, i. e., automatically remove such incrustation as the pallet passes through its dumping position and to a horizontal position for repeating the operation.

In the prior art constructions, grate bars have 25 been provided supported on a carrier frame and provided with movable elements to perform the automatic cleaning operation. These have been too costly because of design; have been of faulty design; or, where sufiicient open area for passage 30 of gaseous products has been provided, parts have been weak resulting in excessive warpage and breakage with resulting operating troubles; or, where open area has been sacrificed for strength, process difficulties have resulted, and

5 production capacity decreased because of that deficiency.

The object of the present invention is to provide a sintering machine with a pallet in which the liability to warpage and breakage is greatly 40 reduced, in which free area for passage of gaseous products is provided, and in which the efficiency of the cleaning operation is not sacrificed. With this object in view, generally stated, the removable elements of the grate are placed 45 with and restrained by a base casting in the form of a grid, which base casting is reenforced by a rib cast integral therewith and projecting downward therefrom. The grid is provided with alternating transverse bars and openings, and

50 the reenforcing rib for the grid extends from end to end and below the grid, and independent or separate movable elements are placed in the openings above the rib and are loosely retained in said openings between the grid and carrier 55 frame of the machine so as to permit independent movement of each movable element in the openings and at substantially right angles to the upper surface of the grid.

The inventive idea is capable of receiving a variety of mechanical expressions, some of which 5 for the purpose of illustrating the invention, are shown in the accompanying drawings, but it is to be expressly understood that such drawings are for the purpose of illustration only and are not designed to define the limits of the inven- 10 tion, reference being had to the appended claims for this purpose.

In said drawings- Fig. 1 is an exploded perspective view of a carrier frame forming part of a pallet of a sintering machine and the grids supported thereon, each grid having alternating transverse bars and openings, and showing also one of the independent separate movable elements for placement in said openings;

Fig. 2 is a broken plan view of the grid;

Fig. 3 is a longitudinal section on the line 33 of Fig. 2; and

Fig. 4 is a vertical section on the line 4-4 of Fig. 2.

In said drawings, in which like reference numerals indicate like parts throughout the several views, I is a carrier frame of the usual or any suitable construction, such for example, as that employed in the well-known Dwight & Lloyd sintering machine. As shown, this carrier frame has vertical side walls 2--2 and transverse members 33 connecting the side walls 22, the whole frame travelling on wheels in the usual manner in such constructions. 4 indicates cast grids, here shown as three in number, each grid being provided with alternating transverse bars 5-5 and openings 6--6 and a rib 1 extending from end to end of the grid 4 beneath the bars 55 and openings 66 and cast integrally with 40 the end walls of the grids 4 and with the transverse bars 55. At the end of each opening 6-5 the opening is cut away as at 6'. Each of the grids is held in fixed position on the carrier frame by means of pins 8 passing through the side walls of the frame and into the sunken portion 9 at each end of each one of the grids. Located within each of the openings 6-6 is a movable element ll] of such width as to leave a small air space between the sides thereof and the walls of the opening, said element tapering from its full width at the upper portion inward and downward, as is clearly shown in Fig. 2. This element H1 is provided with projecting lugs or parts it, one at each end, these lugs engage in the cutaway portion 6' of the openings 66, with the surface of the element I normally on a level with the upper surface of the grid, as will be clearly understood from an inspection of Figs. 3 and .lugs [IV-HI do not fit tightly within the cutaway portions 6 of the openings 6-6, but are of such dimensions as to leave the elements l0|0 free for a limited movement outward so that their surfaces project somewhat beyond the surfaces of the transverse bars 5 as the pallet passes through dumping position and onward therebeyond into a practically inverted position. These outward movements of the independent movable elements occur from impact of the pallet in dumping under the action of gravity and eifect the cleaning operation. It will be readily seen that the reenforcing ribs being cast integrally'with the grids 4 and with the transverse bars 55 thereof, provide a very efiective means of resisting any tendency to warpage and breakage, ,while'at, the same time said rib passes beneath the openings 66 in the grid and beneaththe elements I0. These elements H) are preferablysomewhat cut away on their. under sides, as shown at l I in Fig. 4, to the end that the several elements may be readily inserted in position in the, grid. Moreover, it will be 'seen that inasmuch as these elements ID are separate and independent of each other, any injury or damage to. one of these may be readily repaired by replacing any damaged element with another like element.

It will be recognized by those skilled in the art that the grid is, one-of exceptional strength; that liability to warpage and breakage is greatly reduced, and that the cleaning operation, due to the independent movable parts I0 is highly eificient. i

Having thus described the invention, what is claimed is: ,j

1. In a sintering machine having a series of traveling pallets,-the combination in said pallets of a bodily movable carrier frame, a fixed grid supported on saidframe, said grid having alternating transverse bars and openings, a reenforcing rib for the grid under andintegral with said bars and extending from'end to end of and below the grid, and movable elements over said rib and within the openings in the'grid and retained in said openings between the grid and frame. i

2. In a sintering machine having a series of traveling pallets, the combination in said pallets of a bodily movable carrier frame, a fixed grid supported on said frame, said grid having alternating transverse bars and openings, the walls of the grid being undercut at the ends of said openings, a reenforcing rib for the grid and extending from end to end of and below the grid, and separate movable elements above said rib and within the openings in the grid and having end lugs entering the undercuts in the grid, whereby said elements are retained in said openings between the grid and frame.

3. In a sintering machine having a series of traveling pallets, the combination in said pallets of a bodily movable carrier frame having side walls connected by a plurality of transverse members, fixed grids supported on and extending from side to side of said frame, said grids having a plurality of alternating bars and openings extending in the line of movement of the frame, a reenforcing member under and integral with said bars and extending from end to end of the grids, and bar shaped members retained within said openings and capable of a limited movement at right angles to the surface of the grid.

4. In a sintering machine having a series of traveling pallets, the combination of a carrying frame having two oppositely disposed side walls connected by a plurality of transverse members, fixed grids supported on said side walls and transverse members, a reenforcing rib extending beneath and from end to end of each grid, said grids having a plurality of alternating transverse bars and openings extending in the line of movement of the carrier frame, and elements within said openings and having end lugs extending loosely between the under side of the grid and the said transverse framemembers.

5. In a sintering machine having a series of traveling pallets, the combination of a carrier frame, a grid extending from side to side thereof,

said grid having a plurality of alternating transverse bars and openings extending in the line of travel of the carrier frame, and movable elements in said openings, said movable elements having end lugs extending between the grid and the carrier frame.

6. In a sintering machine having a series of traveling pallets, a grid extending from side to side of the pallet and having a series of alternating transverse bars and openings, a reenforcing rib extending under said bars and openings and integral with said bars, and a plurality of separate movable elements in said openings and extending across and above said rib and having at each end a part extending beneath the surface of the grid. 7

MUNROE F. WARNER.

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