US2012726A - Screen - Google Patents

Description

Aug. 27, 1935. R. E. MINOGUE SCREEN 1951 2 Sheets-Sheet l Filed June l5 Aug. 27, 1935. R. E. MINOGUE SCREEN 2 Sheets-Sheet 2 Filed June l5, 1951 nlum-nimiiim- PatentedAug. 21,1935 r` 2,012,726?Y A i SCREENr l l Roland E.- Minogiive, Manitowoc, Wis., assiglior;

by imesn'e assignments; to Rem vEngineering Co., Wilmington, Del., ac'orporation'of Dela' ware y -Y t AApplication.nui/e"',1931, serial'No. 544,378'

A 9 Claims., (Cl..209-`-279) invention relates v to `improvenments Ain "The casing sections ll 'and l2 -wi'll preferably screens particularly designed and adaptedy Afor be formed-from suitableslieetnietal and the cas'- gradingv crushed cement clinker and sil'nilar proding ring will be a steel casting'f,

ucts, either wet or dry. l To provide'access to thefinterior -'casing 5 'Theobject ofmthe invention is to provide a B', both casing sections' I l and I2 comprise sepascreen for ,the purpose specied, which will be rate,"rer"n'o,vable portions at their front sides, thus Simple in construction, strong and durable, in providing access to the interior of said casing for .vwliich parts subject to Wear Will be readily acpurposes of installation, repair 'and replacement,

lcejssible forrepar 'or replacement, and which Will Whencessalyl ,be highly eective i'n ,operati/ond Y The top of the upper casing section IZis. closed 10 To eect the objects of the invention, my imi by .a plate I4, also iliade of 'sheet metal, which proved screen comprises 4the various features', is'secured tothe upper edge of said casing 1section combinations of features and'details of construc-` by means 0f an llilaf iimbei l5 0f angular tion hereinafter described and claimed. cross-'Section rigidly connected to botli the side 15 In the accompanying drawings, in which the d 'D WLHS 0f S'd Casing SC'tOIl by riveting, .u

invention vis fullyfillustra'tedf, Spt-Wllg I G'fhjiWiS'- 4 1 Figure 1'is a top-.planview of a screen embody' RtatablyV lno'unted in'l the upper casing s'ecing my invention andA improvements'. tio'n I2, `is a fan ,designated as a Whole C, said Figure 2 isa sectionalplan View substantially on ff CII'Sig lllO-W 1111104 FOII I7, Sellre 2U' the line 2-2 of Figli. to and extending substantially radially from E! Figure 3 is a sectional elevation' substantially Whi a varies I8, whicharerig'idly Corine'ted on the lined- 3 of Fig.,1. adjacent their lower, outer edges by a' ring I9 Figures 4 and 5 are detached top-planand side t0 which they are rigidly secured any suitable `views, respectively, on an enlargeds'cale, of the manner. impeller; and 1 Figure 6 is a fragmentary Viewv illustrating a Of th fain' VSJGS 'I8 ae U'DWadlY CuVdraSSTWrfl structural,detail.l 1 at 20. As shown,elso, the top ofthe fan "Cris Describing the invention with particular refer- Closed by a sheet metal plate, while-thebottom For reasons presently apparent, vthe lower: edges '25 ence to the drawings, the operative parts of the of the' fan is" in 'O'De crriunatiowitiithe A 'machine are mounted upon a suitable frame des'- lOWT Casing SCiOIi Il.' 3U ignated asa Whole A; which comprises an annu- The Upper ClSnS`C0 l2 iS Jl/'ded With Ala; blawsemplaf-,e |71 adapted to resi; on a; suitable discharge' connections l2. shown" as' arranged foundetiomthe linecf which is indicated et 3, 'Substantially taneentially to th sidewalls' 61Ev A and which` is providedwith a central hole ori open- 'said casing SGG'O'IL. a'd which .are adapted 'fOr ing 4, surrounding which is an upstanding making pille CnneC'OfiS 0G Said fari casing for 35 flange 5, delivering Screened material tlierefi'oirivtofstrinnns 1 made, es shown, in theform of channels, in the' oii'e'g 4 iii-fthe, base plante' I ,with Vits 40 theupper ends of which dreconnctedpye; spider upper ,end in. 'Open cofniatio With the 'i- 40 comprising a hollow hub portion 8and arms s, terionofjthellower"cdsingsection IVI. which diverge radially; fromseid hupfportion. Thief fan Oisseur'did the lower, 'ri'fy A.For reasons present1y'apparent,`the frhula'` 8' is prohollowgsl'laft 2 I` rottablyiounted in the bearing videdwitliabearinglo; i ImjWhicnas shown, is formed directlyine.

d'5' `As shown, there are'thrgee spiderfdrnis'espajced bronzeipnsningg- 2'2 removably', secured inthe is'.

lapproximately ninety degrees apart and drranged Spider 1i 8, 'liusip'roviding for renewing s'aid Ain sucn relationthatthe front koftheappara"tus bushing' when it beoordes worn. willl beunobstruoted and freely accessible. J fI'heWeight of trie liollowslift Zland parts Ihescre'en also comprisesa casing designated 'carried thereby) including the fan C, is supt0 as e ,wh'clen comprising e'lowersecticn n seported by e. thru-st .cenetta which, preferably, is 50 cured to the upper end of the flange 5 on thebese threaded and keyed to said hollow;v ,shaft 'and plate l, and arij upper section 1.il2 no rrieict'ed..` to ti/.nicnas shown, fo'rms' pat 'of an anti-friction and supported upon the lower casing se'ctionyl I` by bearing, designatedy as' 'd whole D. Asshown, said hieansofvvhat; for purposes' of coriveliientrefer-v bearing isA indicatedT diagrammatically .only-,ias

i6 encej-may be designated'acasing ring' I3. i my invention contemplates theus'e ofeny -siiit- 55 able form of Vbearing such as may be purchased commercially or supplied by skilled mechanics without the exercise .of invention. Inorder to increase the life of the bearing D, the base member 24 thereof comprises upstanding spaced flanges 25 and 26 which define an annular space 21 designed and adapted to contain oil or grease, in which the-anti-friction member of the bearing is positioned, thertop of said space21being closed by the thrust collar 23 which, as shown, forms part of said bearing. l'

Secured to the hollow shaft 2| thrust bearing D is a driving pulley 28, which also, preferably, is threadedA and keyed to `said hollow shaft and which, as installed for use, will f,

bear against a centrally arrangedxhub portion of the thrust collar 23, thereby reinforcing and strengthening the engagement of said thrustl collar 23 with said hollow shaft 22 towithstarfdv the stresses to which it will be subjected muse.

As shown, a collar29is securedto the lower cured to .the lower e'ndfof the hollow Shaft. 2|,

and a plate 3| supported below and in spaced relation tothe collar 30 by means "of vanes 32 which, as.shown,'are secured to said p lateand'v collarby means of screws, studs or other suitable means. 'I he vanes 32 arev arranged in symmetrical seriesaround the impeller,.their inner ends lterminating in sharp points, as shown, see Fig. 4,

the relation being such that an unobstructed IspaceV will be defined at the centerof the` plate i3| 'bythe inner ends of said vanes,`and the 'advvancing sides of said Vanes being outwardly and rearwardlycurved, as shown,.relativ'e to the direction of rotation ofthe shaft 2|and thus vof the impeller E, in operation. i In what I now consider the preferable relation, the impeller lcomprises eight vanes 32,I but the number thereof may be varied as may be desired, within the scope and contemplationof my inVentio'n. I j

' fPreferably, 'also,lthe impeller E comprises a conical'projectionVV 33 on .the Vupper face of thel plate 3| arranged centrally of the shaft 2| within the space defined by the inner ends' of the impeller, vane-s 32. '.The screen proper 34 is made kof suitable screen material, preferably woven wire fabric of suitable mesh,` and is shaped to conform tothe curved lower edges of the fan vanes I8'to whichit is secured, its peripheral edge being secured to the fan ring |9 and its inner edge to a collar 35 forming part of the impeller E.A 1 In the preferable` construction shown, crushed material to be screenedis delivered to the impeller E through a feed pipe 36. supported'V in fixed position withinthe hollow shaft 2| finy such relation that itslower end willterminate only slightly above the lower end of said'hollowshaft, :and its upper end extending somewhat above the ,upper .end of said shaft. As shown, said feed pipe 36 is supported by` meansof a collar 31, braz'ed, welded or otherwise secured thereto and which is bolted or otherwise secured to a raisedV support r 38,.comprising supporting legs 39 bolted or .oth-

above the shaft 2| and with it to the fan C and the impeller E by means of a belt, not shown, applied to the pulley 28 which connects the same with a suitable source of power, not shown, what I now consider a preferable relation being such that said shaft 2| will be driven at a speed of approximately 600 to 1,000 R. P. M.

In operation, air is admitted to the casing B through'r holes formed in the wall of said casing, preferably adjacent its lower end, whence it passes upwards through the lower casing section into the section I2, in which the fan C is mounted, through the screen proper 34 and is discharged through the discharge connections I2'. As shown,'said air admission openings are l formed by short pipe sections 40 secured in holes formed in the flange on the base ring I. To

, prevent relatively coarse, heavy material rejected by the screen 34 from passing into the open ends of'saidA pipes, instead of downwards into the hopper, the top sides of the pipe sections 40jpreferably are extended inwardly as shown at' 4|..

` vThe operation'of the screen is as follows, the description being directed to its `use for grading crushed cement clinker into nes and coarse material or, rejectsz-'I'he power for driving the fan shaft,2| with they fan C and impeller E carried thereby, havingv been appliedand saidshaft having attained a normal rate of rotation, crushed material to be screened is delivered into theupper end of the feed pipe 36, through which it descends by gravity tothe impeller E.

' As the crushedmaterial passes out the lower end'of the feedpipe 3B, the cone 33 on the impeller will operate, inan obvious manner, vto cause said material to'ow outwardly into` the spaces between the inner ends of the impeller vanes 32,

whereupon the centrifugal action of the impeller will discharge said material outwardly into the fan chamber |2 below and closely adjacent to the underside of thescreen proper 34 at what may be described as the Verticall apex' of said screen, whereby the current of air created by the fanC, passing upwardly through the casing B and the screen proper 34, vsupplemented by the `centrifugal action ofthe screen willy operateto project said crushed'material outwardly against the curved undersurface of said screen proper 34, the nes passing through said screen and being'dlsoharged from the casing B through the discharge connections I2 and thence to the storage bins, no t shown, while the rejects, consisting of the relatively coarse material willfall or be'thrown downwardly by gravity into the hopper a, from which it is re- ,turnedto the crusher to bereground and` again screened, this cycle continuing throughout the operation ofthe screen. Among screens emobdying myinvention and, improvements' are the following: i 1. 'Due' to the curvature of the screenproper and to thei fact that the. material is discharged tangentially outwardlyfrom .the'impeller onto. the concave side of the screen, the materialimpinges upon said screen'witha minimum of impact,thus lreducing 'wear-.on ,the screen proper to a minimum. 2.Due to thehigh velocity of the screen proper, larger and heavier particles -of material striking said screen will be thrown. downwards, therebyinto the lowercasingfsection and will strike said screen proper but once, thus'greatly reducingits abrad-` inglactio'n and the wear on the screen.

`3." Material .discharged from -the impeller against the, screen proper is immediately' spread important advantages inherent to out andopened up. permitting the mosterdcient conjoint action'of the screen proper and air it practicable to produce effective separation of the nes by the use of a screen proper of coarser and heavier fabric than otherwise would be possible.

5. Freedom from clogging and large capacity;` and 6. Adaptability for screening either wet or dry materials.

I claim:

1. In screening apparatus, the combination of a frame, a hollow shaft mounted in a bearing therein with its axis disposed substantially vertical, a fan secured to said shaft, means for rotating said shaft and said fan, a screen secured to the lower edges of the vanes of the fan, a casing which encloses said fan and said screen provided with a discharge connection, said screen being positioned in an opening dened by the fan casing and fitting the same with operating clearance, an impeller secured to the shaft below the inner portion of the screen and above the outer portion of the screen for projectingfmaterial delivered into the fan casing through the hollow fan shaft, outwardly across and at a sharply acute angle against the underside of the screen proper. Y

2. Screening apparatus asl specified in claim 1,

the impeller of whichfcomprises a plate supported l in spaced relation to the lower end of said shaft,

- and vanes the leading sides of which are outwardly and rearwardly curved'.

3. Screening apparatus as specified in claim 1,

the impeller ci which comprises a'plate supported in spaced relation toy the lower end of said shaft, and vanes the leading sides of which are outwardly and rearwardly curved and the inner ends of which terminate at a distance from the axis of said plate.

4. Screening apparatus as specified in claim 1,

the impeller of which comprises a plate supported in spaced relation to the lower end of said shaft, and vanes the leading sides of which .are outwardly and rearwardly curved and the inner ends of which are sharp and terminate at a distance from the axis of said plate.

5. Screening apparatus as specied in claim 1,`

the impeller of which comprises a plate supported in spaced relation to the lower end` of said shaft, vanes the leading sides of which are outwardly and rearwardly curved and the inner ends of which terminate short of the axis of the plate, and a cone on the inner surface of said plate.

6. Screening apparatus as specified in claim 1,v the impeller of which is arranged to discharge material to be screened into the fan casing by centrifugal action, the screen proper being substantially umbrella-shaped and the edges of the fan vanes to which said screen proper is secured being curved to conform to the curvature of said screen proper, KVthe relation being such that the discharge. opening of the limpeller is positioned approximately at the apex of the screen.

7. Screening apparatus as specified in claim 1, the frame of `which comprises an annular base plate, an upright' flange which surrounds the opening therein, columns supported on said base plate, a `spider comprising `divergent arms secured to and which rigidly connect saidcolumns, a casing secured to theflange of the base plate comprising a lower section provided withair admission openings adjacent its lower end,'and an upper section in which the fan is rotatably mounted provided with a discharge connection, a plate which closes the top of said casing, and a reject hopper secured to the base plate of the machine with its receiving end in open communication with the opening in said base plate. y

8. Screening apparatusas specified in claim 1, the frame of which comprises an annular base plate, an upright flange which surrounds the opening therein, columns supported on said base plate, a spider comprising divergent arms secured to and which rigidly connect said columns, a casing secured to the flange of the base plate comprising'a lower section provided with air admission openings adjacent its lower end, and` an upper section in which the fan is rotatably mounted provided with a discharge connection, a plate which closes the top of said casing, vand a reject hopper secured to the base plate of the machine with its receiving endr in open communication with the opening in said base plate, theA a casing secured to the iiange of the base plate comprising a lower section provided with air admission openings adjacent its lowerend, and an upper section in which the fan is rotatably mounted provided `with a discharge connection, rthe columns and spider arms of the frame being ar-r ranged on a segment of the base approximating 180 degrees, the remaining segment of the machine being unobstructed and the corresponding portion of the casing being detachable to provide access to the interior thereof.

' ROLAND E. MINOGUE.

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