US1415990A

US1415990A - Rotary kiln

Info

Publication number: US1415990A
Application number: US343438A
Authority: US
Inventors: Alexander B Carstens
Original assignee: American Metal Co Ltd
Current assignee: American Metal Co Ltd
Priority date: 1919-12-08
Filing date: 1919-12-08
Publication date: 1922-05-16
Anticipated expiration: 1939-05-16

Description

A. B. CARSTENS.

ROTARY KILN.

APPLICATION FILED DEC-8,1919.

Patented May-16, 192

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ROTARY KILN- APPLICATION FILED DEC-8, I919.

Patented May 16, 19 22.

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awua 14 oz A. B. CARSTENS.

ROTARY KILN.

APPLICATION FILED DEC.8. 1919.

Patented May 16, 1922.

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22% add SVLUQVI OL UNITED STATES PATENT OFFICE.

ALEXANDER B: GABSTENS, F MONTEREY, MEXICO, ASSIG-NOR TO THE ft'MIlimIGAN METAL COMPANY, LIMITED,

A CORPORATION OF NEW YORK.

Romany KILN.

Patented May t, i922,

Application filed December 8, 1919. Serial No. 343,438.

- To all whom it may concern:

' STENS, a citizen of the United States, residing at Monterey, Mexico, have invented certam new and useful Improvements in Rotary Kiln; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to rotary kilns, roasters, driers, and the like, and particularly to a feeding mechanism for'delivering material to the kiln. Among the uses of the invention may be mentioned burning cement and lime, drying rock, fuels and minerals, agglomerating and nodulizing ores, treating iron blast furnace fine dust etc. It is to be understood that the foregoing statement is not intended to limit the invention to the uses specified, it being the aplicants intention to claim all uses to which his invention isadapted.

The present practice in feeding material to be treated to rotary kilns involves theintroduction of' the material at one end of the kiln through suitable feeding devices. These feeding devices are in the direct path of hot gases and dust issuing from the kiln and are subject, therefore, to destructive action which materially shortens their life. Furthermore, in feeding material at the end of the kiln, the material accumulates-and falls from the kiln instead of passing therethrough as is intended. This represents a substantial loss, since the material must be collected and rehandled. Much of the material is, moreover, carried from the kiln in the form of dust and must also be collected and rehandled. J

It is the object of the present invention to provide feeding mechanism for rotary kilns which is disposed outside the path of the gases in the kiln, and is, therefore, unaffected thereby, and which permits the feeding of material to tions throughout the length, thereof.

A further object of the invention is the provision of feeding mechanism which in sures the deposit of material within the kiln in a manner preventing the escape thereof from the end and reducing the amount of dust to a minimum, thereby increasing the cleanly operation.

the kiln at any section or see Further objects and advantages of the inventlon will be apparent as it is better un derstood by reference to the following specification, when read in connection with the accompanying drawing illustrating the preferred embodiments of the invention, in which,

Fig. l is a transverse section through a 1:0 tary kiln illustrating the feeding mechanism;

Fig. 2 is an enlarged detail in section of the feeding mechanism;

Fig. 3 is an elevation of a portion of the kiln showing the feeding mechanism;

Fig. 4 is a transverse section illustrating the application of a slightly different form of my invention;

Fi 5 is an enlarged detail in section of the feeding mechanism illustrated in Fig. 4; and

Fig. 6 is an elevation of a portion of a kiln illustrating the application of the feedin mechanism shown in Fig. 4.

ly invention comprehends broadly the provision of feeding mechanism. for kilns embodying openings in the kiln spaced longitudinally from the ends of the kiln and provided with closures which normally prevent ingress or egress of material, while nevertheless permitting delivery of material to the kiln under predetermined conditions. In connection with the openings, I provide scoops adapted to pick up material from a suitable container or bin, and controlling means for the closures which permit automatic delivery of the material taken. up by I the scoops to the kiln.

Referring to Figs. 1 to 3 of the drawing, 5' indicates the body of a cylindrical kiln which may be rotated in any suit-able mannor from a, source of power, the kiln being supported, for this purpose on roller bear ings (not shown), in the well known manner. At a point spaced from the end of the kiln, a framework 6 is provided tosupport a bin 7 in which a Suppl. of material to'be treated, or of fuel, such, f r example, as pulverizedcoal, is maintained, the material being supplied, for example, from time to time or continuously through a chute 8.

At points spaced about the circumference of the kiln, openings 9 are provided in the wall thereof, which openings are surrounded by flanges 10. pair of closures or doors 11 are supported on shafts 12 mounted for in the arc.

oscillation in the flanges 10. The closures 11 are normally held in the position indicated in Fig. 2, by springs 13 connecting arms,

14, which are secured to the-shafts 12. One shaft of each pair is provided with an arm 15, which is connected by a link 16 to an arm 17 of a bell crank lever 18, secured to the complementary shaft 12, and the bell crank lever l8'is provided with a roller 19.

The frame 6 supports an are 20, braced by struts 21, above the cylinder 5. A shoe 22 is secured to the arc 20 by bolts 23 and the shoe may be adjusted circumferentially of the are by removing the bolts 23 and reinserting them in suitable openings provided A cam 24 is pivotally supp-orted at 25 on the shoe 22 and is provided with a face 26 with which the roller 19 contacts as the cylinder 5 rotates,

cillation of the bell crank lever 18 to swing the doors 11 to the position indicated in Fig. 1. A bolt 27 is pivoted at 28 to the cam 24 and is engaged in a suitable opening provided therefor in the arc 20. A spring 29 surrounds the bolt 27 between the are 20 and the cam 24, and is of such dimensions that it is normally not compressed when the roller 19 contacts with the cam face to swing the doors 11. However, if any obstruction prevents the swinging of the doors l1,'the spring 29 will be compressed to permit the roller to pass the cam, thus providing a safety device to prevent breaking of the parts under unusual conditions.

The flanges 10 areextended as indicated in the drawing to provide scoops 3O prefedges 31 of hardened steelf These scoopsproject from the kiln 5, and as b the latter erably having rotates, material in the bin 7 is picked up thereby. When the scoop thus filled with material reaches the uppermost limitof its travel, or the point at which the cam 24 has been adjusted, the doors 11 are actuated as hereinbefore described to permit the material to pass into the interior of the kiln. As soon as the roller 19 has passed the cam face 26, the doors thus opened are returned to their normal position by the gases or dust from spring 13 and escape of the kiln through the corresponding opening 9 is thereby prevented.

Referring to Figs. 4 to 6 inclusive of the drawing, 35 indicates a kiln supported and rotated as previously described and provided, in this instance, with a refractory lining 36. At a point spaced from the end of the kiln, a frame 37 supports a receptacle or bin 38 to which material is fed continuously or intermittently througha chute 39. The kiln 35 is provided with spaced openings 40 through which flanges 41 project I and closures 42 are secured to oscillatory shafts 43 which are preferablymounted in suitable bearing blocks secured to the thus causing 0s its normal position.

collar 45 and spiral springs 46 are secured at one end to the collars and at the other to the kiln 35, the springs tending to hold the closures 42 in a diagonal position within the flanges 41 as indicated in F ig. 4. Each of the shafts 43 carries, also, an arm 47 having a roller 48.

A transverse member 49 of the frame 37 is provided with a depending arm 50 upon which a lever 51' is pivoted at 52. The other end of the lever 51 is normally held in a stirrup 53, a weight 54 being hung upon the end of the lever to retain it in the position indicated in Fig. 5. A cam 55 is secured to the lever 51 in the path of the rollers 48. Each of the flanges 41 supports a scoop 56, preferably provided with a hardened edge 57. As the kiln 35 rotates, the scoops 56 pick up material from the bin 38, andas the respective rollers 48 engage the cam 55, the closures 42 are oscillated against the tension of the springs 46 to the position indicated in Fig. 5, permitting the material to drop from the scoop into the kiln. As soon as a 1 oller 48 passes the cam 55, the spring 46 returns the closure 42 to The weight 54 is sufficient to normally hold the cam 55 in its operative position, but in the event that opening of a closure is prevented, the weight will be lifted to permit the roller to pass, thus I preventing breakage of the mechanism.

From the foregoing, it will be ,apparent that I have perfected an apparatus for feeding material to rotary kilns and the like, which, while extremely simple in construction, provides material advantages. It has een demonstrated that by feeding material to the kiln in the manner described, less dust is formed and none of the material is lost from the end of the kiln, as is common inrotary kilns of the type now employed. Owing to the prevention of the losses noted, the operation is made more cleanlyand the capacity of a kiln of given dimensions is materially increased. It is frequently, moreover, a distinct advantage to feedmaterial to a kiln at a point spaced from the end thereof, advantage being thereby taken of temperature and other conditions which substantially effect the results accomplished in carrying out operations in the kiln.

Various changes may be made in the form, arrangement and construction of the parts, without departing from the invention which I desire to claim broadly as the the escape of gases therefrom, and means cooperating with said first-named means to cause a momentary opening of the'same and thereby permit material to pass through said openings into the kiln.

.2. A rotary kiln having openings intermediate the ends thereof, closures normally preventing escape of gases through said openings, mechanical means for automatically opening said closures as the kiln rotates and means for delivering material through said openings.

3. A rotary kiln having a plurality of openings spaced about its peripher closures normally preventing escape o gases through said openings, mechanical means for automatically opening said closures and means projecting from the kiln to receive a supply of material to be delivered through said openings 4. A rotary kiln having an opening therein, a closure normally preventing escape of gases through said opening, mechanical means for automatically opening said closure, a scoop projecting from the kiln at and communicating with said opening and a receptacle from which saidscoop receives material as said kiln rotates.

5. A rotary kiln having an opening intermediate the ends thereof, a closure normally preventing escape of gases through said opening, a scoop projecting from the kiln at and communicating with said opening, a bin from which said scoop receives material, and mechanical means for opening said closure, said means being effective when said scoop has moved to a position which permits the material to drop by gravity through said opening.

6. A rotary kiln having an opening intermediate the ends thereof, a closure normally preventing escape of gases through said opening, a scoop projecting from said kiln at and commumcatin with said opening, a bin from which sai scoop receives material, actuating means for said closure, effective when said scoop has moved to a position which permits the material to drop by gravity through said opening, and means whereby the actuating means is ineffective when said closure is prevented from opening.

7. A'rotary kiln having an opening intermediate its ends, a bin beneath said kiln,

means on said kiln, surrounding said o-pening, to receive and elevate materlal from said bin, a closure normally preventing escape of gases from said opening, mechanical means for opening said closure at a predetermined point in the rotation of said kiln, and means whereby the actuating means is ineffective when said closure is prevented from opening.

9. A rotary kiln having an opening therein, a bin beneath the kiln, a scoop surrounding said opening and projecting from the kiln, a closure normally preventing escape of gases from said opening, resilient means biasing said closure to closed position and cam actuated means for opening said closure.

10. 'A rotary kiln having a plurality of therein spaced about the periphery openin thereo a bin beneath'the kiln, a scoop surrounding each opening and projecting from the kiln, a closure for each opening resiliently biased to closedposition and means for successively opening said closures as said kiln rotates to permit material picked up by said scoops to pass into the kiln.

In testimony whereof I afiix my signature.

ALEXANDER B. GARSTENS.