US2455980A - Split roll for briquetting machines or the like - Google Patents

Description

1948. e. M. DALLAS ET AL SPLIT ROLL FOR BRIQUETING MACHINES OR THE LIKE Filed Sept. 5, 1947 3 Sheets-Sheet l INVEN TORS: 600199111. Dal/m9;

G. M. DALLAS ET AL 2,455,980

SPLIT ROLL FOR BRIQUETING MACHINES OR THE LIKE Dec. 14, 1948.

3 Sheets-Sheet 2 Filed Sept. 5, 1947 INVENTORSI George I1- Dal/(28% B emu/i114 -FIII e,

ATTORNEYS.

m a m Dec. 14, 1948. DALLAS E AL 2,455,980

SPLIT ROLL FOR BRIQUETING MACHINES OR THE LIKE Filed Sept; 5, 1947 3 Sheets-Sheet 3 WITNESSES 21 INVENTORS! ATTORNEYS.

' followshereinafter, having reference Patented Dec. 14, 1948 sr'Lrr ROLL FOR BRIQUETTING MACHINES I OR THE LIKE Georg'e'Mifliin Dallas and Bernard M. Fine, Philadelphia, Pa.-, .assignors to American Briquet :,Company,-Phi1adelphia, Pa., a corporation of Delaware 1 Application September 5, 1947, Serial No. 772,436

11 Claims. (c1.--1's21) 1 This invention relates tosplit-rolls for :briquet ting machines or the like andmore particularlyto pressure rolls the surfaces whereof are subject to considerable wear necessitating periodic replacement or repair. I 1

In briquetting machines it is customary to emlploy pressure rolls between which the briquets are molded, each consisting of ahollow cylindrical shell which is shrunk on and keyed to a cen tral body affixed to a shaft.

necessary to replace a Worn roll it isa most diflicult and. laborious operation to remove the roll from the machine because it 'requires the incidental disassembly of a large portion of the machine. Moreover, it is an expensive and timeconsuming operation, after the rolls have been thusre'moved from the machine, to replace or repair the'worn shells and to reassemble the parts of the roll and of the machine.

The principalobject of the present invention is.

to overcome-the above recited difficulties and this end we accomplish by the provision of a pressure roll having asplitouter shell consisting of anumber of arcuate segments and means whereby such segments may be securely attached to the body of the roll andto each other,'and*yet.bei

readily removable so thatas they'become worn they-'rnay be withdrawn and replaced, with .the rolls remaining in position within the machine; all without requiring disassembly of. other parts of the machine.-: 1-

Still'otherobjects and advantages of the invention, including those'derived from simplicity of.

manufacture and ease -of' ass'embly of. the'constituent parts of the pressureroll, will become more fully'apparent from the detailed descriptions ofa preferred embodiment of the invention which companying drawings.

f the drawings:

Fig. 1 represents aside elevation of a briquettingmachine equipped with split rolls embodying our'invention; "1"]. s: Fig. 2 represents a vertical cross sectional View of r the same taken as indicated by thearrows ill-11 of Fig'l; w L w Fig.3 represents'an enlarged-endelevation of one of the pressure rollsof themachine, the shaft to which it 'is' splined being shown in'cross sec tion; T r

Fig. 4 represents a rows IV f IV of -l ig. 3;

Fig. 5 represents 'I hese rolls are of. considerable size and weight and'when it becomes to the ac-' longitudinal cross section of the pressure roll taken as'indi-cated by the 'ar"-' a partial longitudinal section I of the same taken as indicated 'by the arrow VV of Fig. 3;

Fig. 6 represents a transverse section of the pressureroll taken as indicated by the arrows VIVI of Fig. 4;

'Fig. 7 represents a further enlarged transverse section of a portion of thepressure roll, showing the position of the parts of the roll preparatory to their assembly.

Fig. 8 represents an enlarged perspective view I of one of the wedge blocks associated with the" .pressure roll.

The-briquetting machine shown in. Figs. 1 and 201 the drawings is of a conventional type, ex-' cept for the incorporation therein of pressure rolls' embodying our invention. Fine coal is fed to the machine through a horizontal conveyor 1 and a rotary hopper diagrammatically indicated at 2. Briquets are discharged from the machine and carried to freight cars or trucks by means of an endless conveyor belt 3 passing over belt rollers 4 and driven by a motor 5.

The two pressure rolls 6 are driven from a suitable source of power (not shown) through a drive belt! which engages a sheave-8, the latter being connected to a shaft 9 by a friction clutch H.

On the shaft 9 there is a pinion l2 meshing with a large spur gear 13. Spur gear I3 is mounted on' a shaft having-a pinion l5 which meshes with a similar pinion l6 mounted on shaft l1.

At the opposite side of the machine shaft l1 car-' ries another similar pinion l8. Pinions l5 and I8 respectively drive two large gears I9 and 20 attached to the shafts 2| of the pressure rolls 6 and cause such rolls to berotated at the same speed in opposite directions.

The shafts 2| of pressure rolls 5 have their ends mounted in horizontally movable bearing blocks 22 suitably guided and supported by side frame elements 23 and 24 secured to the foundation 25 of the machine. Rods 26 pass through the side frame elements 23 and 24 and are provided with nuts 21 which serveto maintain the spring caps 28in an adjustable fixed relation to the machine. Groups of springs 29a, 29b bear against the spring caps 28 at their outer ends and against movable pressure plates 3| at their inner ends, the intermediate springs 29b of each group being retained in position by rods 32 and secured to the spring caps 28 bynuts' 33. ing under the influence of the springs 29a, 29b urge the bearing blocks 22, which extend through the tie plates 30 at each end of the side frames,

towards each other and hence maintain the pressure. rolls 36 in close relation to each:

The pressure plates 3| actcluding spring caps 28, springs 29a, 2% pressure plates 31 and bearing blocks22". In-view'oi the size and Weight otthese parts this is a difiieult and laborious operation. Butlas more fully ens plained hereinafter the pressure rolls. dare so designed, constructed and assem-me'dthat'they need not be removed from the machine even after long periods of service.

As shown in Figs. 3, 4, and 5 each pressure roll 6 consists of a generally cylindricalbody 39 and an outer shell consisting of two arcuate segments Ma, Mb removably attached toithe-body 39. In the particular embodiment selected for illustration, the body 39 consists of two sections 39a, 391) (see Fig. 4) fitting overtheinedial portion of the shaft 21, one at each side'of a collar 42 at/the longitudinal center of such. medial .portion of the shaft. The body sections 39a, 391) are splined to the shaft-2| by a key 43 and are secured to each other by bolts 44, washers 45 and nuts 46. Each body section 39a, 391)" has two perimetric cavities 41 extendingaxially and substantially throughout the length of the-rolls. Within each perimetric cavity 41- a series of wedge blocks 48 are accommodated in end. to end relation. After assembly of-thebody sections 39a, 391) it is generally desirable to secure the-nuts 46 in place by welding, as shown at 49.

As shown more clearly in Figs. 6, '7 and 8 the wedge blocks 48 have nut portions '50 of gen erally rectangular shape with flanges 5| which are housed and fitted within the cavities 41 so as to restrain the wedge blocks against-rotation, but with capacity for outward radial 'rnovementlimited by the engagement of the flanges 5| with the internal shoulders 52 of the-cavities. Each wedge block 48 has outwardly projectinglugs 53 which engage interiorrecess'es 54in the-segments Ma, MD of the outer shell, and each Wedge block is threaded, as a nut, to receive the correspond.- ingly threaded ends of bolts 55. The wedge blocks 48 are inserted within the cavities Albe fore assembly of the body sections 99a, 3% upon the shaft 25.

g The outer shell segments M a, d'lb-areprovideda with rows of cup-shaped depressionsu56 distributed over their surfaces and constituting con jugate molds within which the briquets are formed. It will be understood'that the particu'. lar configuration of the depressions 55 maybe greatly varied. Preferably the interior recesses 54 which receive the outwardly projecting lugs" 53 of the wedge blocks are formedxadiacenttm the meeting edges of the arcuate' segments? lla, Mb so that the wedge blocks span thewjointslo'f the shell. By providing inclined surfaces-5l-at the sides of the recesses54 adjacent-to the joints, and by similarly inclining thecorresponding:faces of the lugs 53, as'the wedge blocksi lfil arerdrawn outwardly into engagement with the shell-segments the wedge shaped lugs 53- will tend: to press the shell segments towards each other: at'the joints. I

Desirably the bolts 5'5 are disposed at the joints:

of the outer shell, as shown most-clearly inv Fig-L.

4 buried at the bases of certain of the cup-shaped depressions 56. The bolt heads 59 are ground at the top, as indicated at 62, to conform to the curvature of the depressions 56 and are provided with sockets 63 so that they may be engaged by a wrench for turning. The sockets 63 and the tops of the bolt heads 59 may be filled and coated with tin or Babbitt metal or the like. Likewise the annular space 54 surrounding the bolt heads 59 may be filled with Babbitt metal or the like after the parts of the roll are fully assembled,

thuspreventing the bolts 55 from turning and in -th'e: adjoining walls of the shell segments Ma, Mb, as indicated-at 65, and by knurling the bolt heads 59 it isinsu-red that the bolts will be firmly locked in position so that they cannot become dislodged. Whenever it may be desired to remove the shell segments lla, Mb it is a relatively simple matter to burn out the Babbitt metal ori other material around the bolt heads- 59', which are, then'readily accessible and free for turning, so that'the bolts may lee-Withdrawn and the parts of the rolls may be disassembled It will be apparent that allpartsof-the pressure roll of. our invention which interconnectthe con-- stituent elements of the roll are designed-so that they may be cheaply manufactured and yet: be effective to maintain such elements firmly se cured in interlocked relation to each other. The operations of assembly and disassembly maybe performed with ease by means ofsimple tools and without the necessity of removing the rolls from theirpo-sitions within the machine. U

Although we'have illustrated and described only one specific embodiment of our invention as applied to a particular kind of machine, it will be readily apparent that the invention-may be applied to various types of rolls other than thepressure rol1s= ofa briquetting machine; also that numerous modifications and variations may be made in the form of the body andouter shellsections,.and in the means for interconnecting. such elements, including reversals'of parts; and that ;.certain features of the invention may attimes be used to advantage without the use of other features, all without departing from the spirit of our invention as defined in theannexedclaims.

Having thus described our invention-we.claims 1. A roll for a briquetting machine or the like comprising a generally cylindrical" body having perimet'ric' cavities, wedge: blocks having portionshoused within said cavities with capacity for limited radial movement therein andhaving outwardly projecting lugs, acylindrical shell surrounding said body and consistingv of-arcuate segments interiorly recessed to receive-the outwardly projecting lugs of said wedge blocks and bolting means passing through.=saidshell and engaging said wedge blocks 'tosecuresaid arcuate segments in firm" engagement. with said body.

2. A roll for a briquetting machineorthelikecomprising a shaft having a collar'at its medial portion; a'bo'dy consisting of: generally cylindrical sections keyed to said shaft on.:each.sid'e of saidcollar and secured toeach other,.=said-body having perimetric cavities, wedge-blocks=-having: portions housed within. said *cavitieswitlr capacity for limited radial movement therein and having. outwardly projecting lugs, ,a cylindrical shell-surrounding said body and consisting of arcuate seg-* ments interiorly recessed torreceivef the' outwardly projecting: lugs of :saidzwedg blocks; and. bolting By drilling holes means passing through said shell and engaging said wedge blocks to secure said arcuate segments in firm engagment with said body.

3. A roll for a briquetting machine or the like comprising a generally cylindrical body having axially extending cavities at its perimeter, wedge blocks having nut portions fitting within said cavities with capacity for limited radial movement, but restrained against rotation therein, and having outwardly projecting lugs, a cylindrical shell surrounding said body and consisting of arcuate segments interiorly recessed to receive outwardly projecting lugs of said wedge blocks, and bolting means passing through said shell and having threads engaging the nut portions of said wedge blocks to secure said arcuate segments in firm engagement with said body.

4. A roll for a briquetting machine or the like comprising a generally cylindrical body having shouldered cavities extending axially substantially throughout the length thereof at its perimeter, a series of Wedge blocks disposed end to end through said cavities, said wedge blocks having nut portions fitting within said cavities with capacity for limited radial movement, but restrained against rotation therein, and having outwardly projecting lugs, a cylindrical shell surrounding said body and consisting of arcuate segments interiorly recessed to receive the outwardly projecting lugs of said wedge blocks, and bolting means passing through said shell and having threads engaging the nut portions of said wedge blocks to secure said arcuate segments in firm engagement with said body.

5. A roll for a briquetting machine or the like comprising a generally cylindrical body having perimetric cavities, wedge blocks having portions housed within said cavities with capacity for limited radial movement therein and having outwardly projecting wedge-shaped lugs, a cylindrical shell surrounding said body and consisting of arcuate segments interiorly recessed to receive the outwardly projecting lugs of said wedge blocks, and bolting means passing through said shell and engaging said wedge blocks to secure said arcuate segments in firm engagement with said body and in firm engagement with each other, the latter by virtue of the wedging action of said lugs in the recesses of said arcuate segments.

6. A roll for a briquetting machine or the like comprising a generally cylindrical body having perimetric cavities, wedge blocks having portions housed within said cavities with capacity for limited radial movement therein and having circumferentially spaced outwardly projecting lugs, a cylindrical shell surrounding said body and consisting of arcuate segments with interior recesses formed adjacent to their meeting edges to receive the outwardly projecting lugs of said wedge blocks, said spaced lugs spanning the joints of said arcuate segments, and bolting means passing through said shell to secure said arcuate segments in firm engagement with said body and with'each other.

7. A roll for a briquetting machine orthe like comprising a generally cylindrical body having perimetric cavities, blocks having nut portions housed within said cavities with. capacity for lim ited radial movement therein, a cylindrical shell surrounding said body and having a series of depressions distributed over its outer surface to form molds for material to be molded, said shell consisting of a. plurality of arcuate segments, and

bolts passing through said shell, each such bolt being in threaded engagement with the nut portion of one of said blocks and having its head accessible at the base of one of said depressions.

8. A roll for a briquetting machine or the like comprising a generally cylindrical body having perimetric cavities, blocks having nut portions housed within said cavities, a cylindrical shell surrounding said body and having rows of cupshaped depressions distributed over its outer surface to form molds for material to be molded, said shell consisting of a plurality of arcuate segments having their edges joined along lines extending through the centers of certain of said rows of cup-shaped depressions, and bolts passing through said shell at the joints thereof, said bolts being in threaded engagement with the nut portions of said blocks and having their heads accessible at the bases of said depressions at the joints of said shell.

9. A roll for a briquetting machine or the like comprising a generally cylindrical body having perimetric cavities, blocks having nut portions housed within said cavities, a cylindrical shell surrounding said body and having a series of cup-shaped depressions distributed over its outer surface to form molds for material to be molded, said shell consisting of a plurality of arcuate segments, bolts passing through said shell, said bolts being in threaded engagement with the nut portions of said blocks and having their heads buried at the bases of certain of said cup-shaped depressions and having concavities at their top surfaces conforming to the curvature of said cupshaped depressions.

10. A roll for a briquetting machine or the like comprising a generally cylindrical body having perimetric cavities, blocks having nut portions housed within said cavities,'a cylindrical shell surrounding said body and having a series of cup-shaped depressions distributed over its outer surfaces to form molds for material to be molded, said shell consisting of a plurality of arcuate segments with bolt holes formed at their meeting edges, bolts passing through said holes to engage the nut portions of said blocks and having knurled heads buried within said bolt holes at the bases of certain of said cup-shaped depressions, the annular spaces between said bolt heads and bolt holes being filled with removable hard material.

11. A roll for a briquetting machine or the like comprising a shaft, a body consisting of generally cylindrical sections keyed to said shaft and secured to each other, said body having axially extending perimetric cavities, wedge blocks having portions housed within said cavities with capacity for limited radial movement therein and having outwardly projecting lugs, said perimetric cavities being closed at the ends of the body of the roll but open at the joints between the roll sections, whereby the wedge blocks may be inserted in said cavities prior to assembly of the roll sections, a cylindrical shell surrounding said body and consisting of arcuate segments interiorly recessed to receive the outwardly projecting lugs of said wedge blocks, and bolting means passing through said shell and engaging said wedge blocks to secure said arcuate segments in firm engagement with said body.

GEORGE MIFFLIN DALLAS. BERNARD M. FINE.

No references cited.

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