US3374998A

US3374998A - Sinter breaker and roll crusher

Info

Publication number: US3374998A
Application number: US290717A
Authority: US
Inventors: Harold T Stirling
Original assignee: Stirling Sintering Co
Current assignee: Stirling Sintering Co
Priority date: 1963-06-26
Filing date: 1963-06-26
Publication date: 1968-03-26
Anticipated expiration: 1985-03-26

Description

March 26,1968 H.T. S -TILIN1G V v 3,374,998

' SINTER BREAKER AND ROLL GRUSHER ZShets-Sheet FiledjJ-une 216, 1963 596w mm Marb 26,1968 H T.snRqNcg'f-fi .1 3,374,998

SINTER BREAKER AND RbLIL CRUSHER F iled Jun 26, 1965 v ZSheets-Sheet 2 United States Patent f This invention relates to sintering operations and, more particularly, to means for breaking and sizing sintered masses into sized pieces. 7

In sintering plants, handling of the sinter frequently presents a difficult problem. In the process of making sinter, the sintered ore or other product is discharged from the pallets on which it is formed as coherent masses referred to as sinter cakes. It is necessary to break these cakes into pieces or lumps of useful size. The sinter cakes from a continuously operating sinter strand are usually discharged into a chute down which the sinter slides passing over a grizzly bar for the removal of fines. Material is then passed to a grate-like support. Cooperating with this support is a rotary shaft on which is a seriesof hub elements, each having a plurality of integral radial arms which form a crusher. The crusher arms pass between thebars of the grate-like support and break the sinter cake. The sinter cake is then discharged from the-machine more or less intermittently and much of it is in large pieces, particularly if the sinter is hard and well fused. The apparatus heretofore used had the disadvantage that the product was not properly sized.

Production of uniformly sized sinter is of considerableimportance. Most sinter is used in a blast furnace. A sized sinter results in better permeability inthe blast furnace thereby reducing operating costs and increasing productivity since more air can be use-d. In addition, a uniformly sized sinter reduces the tendency of the blast furnace to hang up thereby reducing the amount of slippage in the furnace. A uniformly sized sinter also allows steadier operation of the blast furnace. Heretofore, sintering plants have not produced a sized product that meets optimum blast furnace requirements.

It is an object of this invention to provide an improved sinter breaker and roll crusher which, in a single integrated unit, can reduce sinter cake in one pass tosizes as small as three-eights of an inch and to obtain a uniform product having desired top and bottom sizes wherein substantially all of the material is reduced to this predetermined size.

A further object of the invention is to provide apparatus which, in a single unit using a single power supply, performs the work normally assigned to separate crushers, a primary and a secondary.

A still further object of this invention is to provide such an apparatus wherein simplicity, reliability, and strength are combined with minimum space requirements having very low head room thereby allowing the entire sintering strand to be at a lower level than has been used heretofore. The lower head room required by the apparatus of the invention reduces the large number of the structural supports heretofore necessary.

These, and other objects, are secured by my invention which is more fully described in connection with the accompanying drawings in which:

FIGURE 1 is a cross-sectional view of the apparatus of the invention taken on lines 11 of FIGURE 2;

FIGURE 2 is a transverse cross-sectional view taken on lines 22 of FIGURE 1;

FIGURE 3 is a more or less schematic side elevation of the sinter breaker and roll crusher of the invention; and

FIGURE 4 shows the general arrangement of the drive mechanism for the apparatus of the invention.

3,374,998 Patented Mar. 26, 1968 Referring now to the drawings, numeral 10 designates the discharge end of a sintering strandover which a succession of pallets 12 are carried and inverted so that the sintered; cake falls fromeach pallet down the grizzly bars 14- and onto the grate bars 16 whichare supported in, parallel fixed relation to one another by support means 17; The entire sinter breaker and roll crusher unit is housed in housing 11.

Cooperating with the grate bars 16 is a breaker wheel 18 having radial arms 19. Arranged near the top of, housing 1 1 is a deflection plate 20 which functions to ensure piecesof sinter cake falling through the grate bars 16will be sufiiciently. small to be readily crushed by the crushing rolls 22, 24which rotate in opposite directions. Guide means 21 is. provided to direct the, pieces of sinter which fall through bars 16 into the nip of crushing rolls 22, 24.-

The crushing rolls 22, 24 receive broken sinter cake from the grate bars 16 and crush the material toa desired topsize. The spacing of the crushing-rolls 22, 24 is adjustable in accordance with the invention within precise limits by adjusting means 70, shown schematically in FIGURE 3. Rotation of nut 72 on adjusting means 70 performs this simple adjustment through rods 74. Spring means 76 continually bias shaft 55 of crusher roll 24 towards crushing roll 22. Movement of roll 24. towards 22 is limited by nut 72.

The crushed material from rolls 22, 24 fall onto a screen 26comprisedof a plurality of bars 28 arranged parallel to each other. The distance between the bars 26 small for use in further processing equipment, e.g., ablast' furnace, is then passed to a conveyor means32 for recycle tothe feed of the sinter strand. The material which does not passthrough the bars 28 of screen 26 fallsonto cont veyor 34. for removal from the system as product.

A spillage chute 36. having two

legs

38, 40 is provided to direct material to the sizing screen 26 from the grizzly bars 14 through leg 38 or to direct material falling from the pallets 12 as they break. apart through leg 40.

The sinter strand 10' is supported on structural supports such as that shown at 13. By virtue of the compact construction of the sinter breaker and roll crusher and attendant equipment, it is possible to position the top of the sinter strand as little as 18 feet above floor level. In conventional sinter operations, the sinter strand with separate sinter breaker and roll crusher apparatus would be twice as high as the sinter strand of the instant invention. By virtue of the compact design of the sinter breaker and roll crusher arrangement, it is thus possible to lower the sinter strand as much as 18-20 feet from that used in conventional designs thereby eliminating about half of the structural supports that would be necessary for two separate pieces of equipment,.i.e., a breaker roll and a separate roll crusher.

The entire sinter breaker and roll crusher arrangement is driven by a single motor 40' by virtue of the novel drive mechanism shown in detail in FIGURE 4. The drive shaft 42 of motor 40 rotates Wheel 44 which turns pulley 46, which in turn rotates a fly wheel pulley 48. As fly wheel pulley 48 rotates, shaft 50 is rotated thereby causing rotation of gear wheel 52 which drives crusher roll 22. Shaft 50 is supported in pillow blocks 51 (FIG- URE 2). v

Interlocking with gear wheel 52 is a gear wheel 54 on shaft 55 which rotates in the opposite direction and causes rotation of the second crusher roll 24. Also interlocking with gear wheel 52 is an intermediate gear wheel 56 which is rotated by the rotation of gear wheel 52. The rotation of gear wheel 56 causes rotation of intermediate shaft 58 which in turn rotates gear Wheel 60 which interlocks with gear wheel 62 which rotates shaft 64- to thereby rotate the breaker wheel 18 which is mounted on pillow blocks 66 (FIGURE 2). The use of a single motor to drive both the breaker wheel 18 and the crushing rolls 22, 24 results in a substantial decrease in the capital expense involved in producing a uniform sized sinter.

Having thus described this invention in such full, clear, concise and exact terms as to enable any person skilled in the art to which it pertains to make and use the same, and having set forth the best mode contemplated of carrying out this invention, I state that the subject matter which I regard as being my invention is particularly pointed out and distinctly claimed in what is claimed, it being understood that equivalents or modifications of, or substitutions for, parts of the above specifically described embodiments of the invention may be made without departing from the scope of the invention as set forth in what is claimed.

I claim:

1. In combination, a sinter strand and a sinter breaker and roll crusher operatively associated with the discharge end of said sinter strand, said sinter breaker and roll crusher comprising a plurality of breaker bars, a rotatable breaker wheel having radial arms thereon, said breaker wheel being so positioned that said radial arms pass between said breaker bars whereby sinter cakes falling from said sinter strand are broken into small pieces, a pair of rotatable crusher rolls beneath said breaker bars and positioned to receive between them and crush the small pieces of sinter passing through said breaker bars to form crushed sinter having a predetermined maximum size determined by the spacing between the crusher rolls, said crusher rolls being disposed in aligned parallel relationship and being adjustable towards and away from one another to adjust said maximum size, sizing means beneath said crushing rolls to receive crushed sinter therefrom and to remove material sized smaller than a predetermined size, a motor having a drive shaft, and a drive mechanism operatively associated with said motor to drive said breaker wheel and said crusher rolls, said drive mechanism comprising a relatively small pulley wheel attached to the drive shaft of said motor, a relatively large pulley wheel having a shaft extending therefrom, a pulley operatively associated with said pulley wheels to drive said relatively large pulley wheel, one of said crusher rolls being mounted on, and rotated by, said shaft, a first gear mounted on the far side of said shaft, a second gear interlocking with said first gear, a shaft extending from said second gear for driving the other crushing roll, a third gear interlocking with said first gear and having an intermediate shaft extending therefrom, a fourth gear on the far end of said intermediate shaft, a fifth gear interlocking with said fourth gear, and a shaft extending from said fifth gear for driving said breaker wheel.

2. In combination, a sinter strand and a sinter breaker and roll crusher operatively associated with the discharge end of said sinter strand, said sinter breaker and roll crusher comprising a plurality of breaker bars, a rotatable breaker wheel having radial arms thereon, said breaker wheel being so positioned that said radial arms pass between said breaker bars whereby sinter cakes falling from said sinter strand are broken into small pieces, a pair of rotatable crusher rolls beneath said breaker bars and p0- sitioned to receive between them and crush the small pieces of sinter passing through said breaker bars to form crushed sinter having a predetermined maximum size determined by the spacing between the crusher rolls, said crusher rolls being disposed in aligned parallel relationship and being adjustable towards and away from one another to adjust said maximum size, sizing means beneath said crushing rolls to receive crushed sinter therefrom and to remove material sized smaller than a predetermined size, a motor having a drive shaft, and a drive mechanism operatively associated with said motor to drive said breaker wheel and said crusher rolls, said drive mechanism comprising a relatively small pulley wheel attached to the drive shaft of said motor, a relatively large pulley wheel having a shaft extending therefrom, a pulley operatively associated with said pulley wheels to drive said relatively large pulley wheel, one of said crusher rolls being mounted on, and rotated by said shaft, and the other of said crusher rolls and the breaker wheel being driven from said pulley wheel.

References Cited UNITED STATES PATENTS 1,338,845 5/1920 Schultz 241-1525 1,818,643 8/1931 Nieman 74-665 1,864,973 6/1932 Buchanan 241-4525 2,493,924 1/1950 Mowad 74-665 3,039,756 6/1962 Reinfeld 26621 I. SPENCER OVERHOLSER, Primary Examiner.

JAMES H. TAYMAN, 111., Examiner.

J. J. MULLEN, E. MAR, Assistant Examiners.

Claims

1. IN COMBINATION, A SINTER STRAND AND A SINTER BREAKER AND ROLL CRUSHER OPERATIVELY ASSOCIATED WITH THE DISCHARGE END OF SAID SINTER STRAND, SAID SINTER BREAKER AND ROLL CRUSHER COMPRISING A PLURALITY OF BREAKER BARS, A ROTATABLE BREAKER WHEEL HAVING RADIAL ARMS THEREON, SAID BREAKER WHEEL BEING SO POSITIONED THAT SAID RADIAL ARM PASS BETWEEN SAID BREAKER BARS WHEREBY SINTER CAKES FALLING FROM SAID SINTER STRAND ARE BROKEN INTO SMALL PIECES, A PAIR OF ROTATABLE CRUSHER ROLLS BENEATH SAID BREAKER BARS AND POSITIONED TO RECEIVE BETWEEN THEM AND CRUSH THE SMALL PIECES OF SINTER PASSING THROUGH SAID BREAKER BARS TO FORM CRUSHED SINTER HAVING A PREDETERMINED MAXIMUM SIZE DETERMINED BY THE SPACING BETWEEN THE CRUSHER ROLLS, SAID CRUSHER ROLLS BEING DISPOSED IN ALIGNED PARALLEL RELATIONSHIP AND BEING ADJUSTABLE TOWARDS AND AWAY FROM ONE ANOTHER TO ADJUST SAID MAXIMUM SIZE, SIZING MEANS BENEATH SAID CRUSHING ROLLS TO RECEIVE CRUSHED SINTER THEREFROM AND TO REMOVE MATERIAL SIZED SMALLER THAN A PREDETERMINED SIZE, A MOTOR HAVING A DRIVE SHAFT, AND A