US1284095A

US1284095A - Centrifugal screen.

Info

Publication number: US1284095A
Application number: US18348117A
Authority: US
Inventors: Oscar M Gruender
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-07-30
Filing date: 1917-07-30
Publication date: 1918-11-05
Anticipated expiration: 1935-11-05

Description

O. M. GRUENDER. CENTRIFUGAL SCREEN.

I APPLICATION FILED IuLv 30. Ism.

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Patented Nov, 5,1918;l

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0SCAR`M. GRUENJDEBJ, CHEGAGUiEElGlE-ITS, liLIiNUliS.

Application filed July 30, 1,917.. Serial No. Mdel.

To all whom t 'may concern: y

,Be it lenovvn that l, @scan M. GRUENDER, a citizen of `the United States,`,1esidii1g .at .Chicago Alf'ieights, in the .county `ofCook Vand Sta-te of Illinois, have invented `a `certa'ni new and useful .Improvement in Centrifugal Screens, of Which `the following is a specili'cation.

My invention relates to improvements in centrifugal screens particularly such .screens as are provided with means `fior simultaneously vibrating yor oscillating the screen surface to assist `in .the .screeningprocess and to protect the 4screens against blindinor. @ne `object yof my invention is to `provide .a .new and improved .arrangement whereby .the screens vthemeelvesimay be much more durable `and may be protected against undue shocks, jolts and liars `and wherein the vibration effect while effective for thepurpose `of keeping the screen meshes `from blinding and for thepurpose of .assisting in `screening will not result in lsnappin, .f r or breaking the screen fabric itself. Another object is to `,provide .a screen of this :tyipe which will be llsi-niple and easy to manufacture. require a minimum power for operation: vvill be .en trernely durable and convenient. Other objects vvill appear from time totime ithrouglr out the specification.

My invention is illustrated more or less diagrammatically in the accompanying draw ings wherein- Figure l is a `vertical section;

Fig. 2 .is .a plan of the screen with seueral screen sections removed ,and parts broken away to show the frame and associated parts;

Fig. 3 is a plan of one of the` screen sec tions;

Fig. l is a section on an enlarged scale along the line .fl-a 'of Fig. `2;

Fig. y5 is a part section in part elevation on. :au .enlarged Vscale-with parts omitted on plane .perpendicular to kthe plane of the section ofFig. 1,;

Fig. 6 ig .a .section alongthe line 6-*6 of riga.

Specification of LettersPatent.

Patented Nov.. o, leid..

A5 A5 are spacing sleeves `interpfosed be- .ttveen the hopper A3 and `an inner hopper Athe parte being held in fixed position. by

,means .ofthe bolts and nuts A7 as indicated.

The hopper A discharges through a pipe AS passing through the wall of thehopper lt is understood that the hopper A3 is iframe is `bolted in position as indicated .and

carries at its `center ra cylindrical box or roller .housing B1. This box `or roller housing Blais provided with an upwardly lextending outerflange or Wall B2 and .aleentral upwardly extending boss B3. Radially arranged shafts Bf are supported `at their inner Wall B2 and `boss B3 and have rotatably mounted thereon the rollers B5. I have shown these rollers diametrically o.p posed and two in number.` @bviously it might be possible to change the number or arrangement ofthese rollersI depending on the circumstances of the `case and particularly upon the Weight to becarried by .the rollers andthe contour of the/track which `l have subsequently described which rides upon them. The boss B3 extends up a `considerable distance above the bottom Wall of the housing B1 and contains a bearing `sleeve BG anchored thereon against rotation .and held in position on a vertical axis. BY is a shaft rotatably and slidable mounted in the bearing sleeve BG and extending vupvvardly therefrom.

Gis an annular casing resting` upon the bed A. This annular casing carries a frame C1 made up of angle .iron members extending `rad'mlly inward `and rigidly attached to alconical drum C2. This conical drum has rigidly mounted in ita bearing sleeve C3 in `line with thefbearing sleeve B6 the shaft B'r being rotatabl)7 and slidablyniounted init. y

'C4 a bracket integral with the conical ,drum C2. ItcarriesbeaningsC5 in which the shaft C is rotatably mounted. `One end .of this shaft carries driving pulleys CT adapted `to be driven y `source of `povver .not here shown. On the .from any suitable inner end` of this As'hait 4C is a bevelpinion C3 `in mesh with a bevelgear C9 feathered on fthe `shaft B7. y

D lDl are bracket members mounted 4on .the

wardly from the member D1 bearing C3 adapted, engaging as they do the upper and lower surfaces of the hub D2, to hold the bevel gear C9 against vertical movement while in no way interfering with its rotation. Da is a sleeve projecting upenlarged as at D4 to provide an oil chamber. The shaft B7 terminates at such enlarged portion carrying on its upper end a thrust washer D5 in rotatable engagement with a stub shaft D6 which stub shaft is feathered in the sleeve D3 so that while free to move longitudinally it is held against rotation. D7 is a spring surrounding the reduced part of such stub shaft engaging a shoulder D8 at one end and a bracket D9 at the other, the bracket D9 being held adjustably toward the sleeve D3 by the bolts D10 whereby the tension on the spring D7 may be adjusted to yieldingly hold the shaft B7 in its downward position.

E is a feed chute extending inwardly through the conical drum C2. It discharges against a distributing cone E1 which cone is mounted on the shaft B7 being held in position thereon by means of the set screw E2. This cone terminates in upwardly extending sleeve E8 extending up outside of the bear'- j ing sleeve C3 to protect it. E4 is a screen hub keyed on the shaft B7. It terminates in a downwardly extending cylindrical flange E5 extending down outside of the housing B2. It carries a track E6 provided with diametrically opposed high and low points as indicated adapted to rest upon the rollers B5. The track and rollers are inclined so that they tend to center on one another. E7 E7 are a series of radially arranged spring bars mounted at their inner ends on brackets ES projecting outwardly from the flange E5 and at their outer ends on a supporting ring E9 which joins the4 outer ends of all of the spring bars. This arrangement provides a skeleton frame for the screen upon which the screen sections may be removably supported and by which they are yieldingly supported or sprung so as to modify the sudden jarring action caused by the eoperation of the roller and corrugated track.

F F are a series of supporting dogs slidably mounted Aon the spring bars E7. These dogs have upwardly extending bosses F1 in which are screwthreaded holding screws F2 which are adapted when tightened on the clamping bars F3 to hold the screen sections removably in position. The screen sections thus are illustrated in Fig. 3. They comprise a series of concentric rigid segments f4 f4 and radial arms f6 f6 arranged in any suitable manner as indicated to make a stiff and rigid pie shaped frame upon which the screen cloth f8 may be stretched and riveted, bolted or otherwise fastened. These screen sections when brought together edge to edge with a spring bar underlying each radial junction line and when bolted in position furnish a continuous circular screening surface. It will be understood that the screen cloth projects inwardly beyond the frame, rests upon the member E4 and is there clamped in position by means of the member E1 so that there is a continuous uninterrupted support for the material down the surface of the member E1 on the screen cloth thence out to the periphery 'of the screening surface.

G G are spray pipes adapted to spray water or other liquid on the upper surface of the screen. A valve G1 is provided whereby the supply of liquid through the supply pipe G2 may be controlled. These spray pipes are located immediately beneath the angle iron member C1 and are covered by the wood, floor or cover G3 supported upon such angle frame. G4 G4 are lower spray pipes adapted to project a series of jets upwardly against the under surface of the screen. The valve G5 is provided to control the supply of material through the supply pipe G6. G7 is a guard ring surrounding the outer periphery of the screening member but overhung by the screening surface. A cone G8 is provided leading from such guard ring to discharge inwardly into the hopper A thus preventing the discharge by centrifugal force of any screened beneath the screening surface.

The annular casing C is reinforced by bracket members H extending between the frame A and the upper frame part C1 so as to distribute the load and tie the parts together and hold them rigidly in proper position.

It will be evident that while I have shown in my drawings an operative device, still many changes might be made both in size, shape and arrangement of parts without departing materially from the spirit of my invent-ion and I wish, therefore, that my drawings be regarded as in a sense diagrammatic.

The use and operation of my invention are as follows The screen is rotated by power applied as indicated. It travels at a suiiciently high rate of speed to insure that the material will travel down from the higher center and be material from Sil discharged away from the periphery. It is not necessary that the speed be very great because there is a sufhcient incline to assisi` the passage of the material and because the vibration which is given to the material reduces the resistance to outward movement. The material is fed to the center of the screen, passes down over the solid conical uide member out onto the screen sections. s the screen rotates the track which supports it travels over a fixed roller and since this tra-ck is corrugated or irregular there is a continuous more or less violent up and down movement of the central screen supporting hub. This violent up and down movement `tion may *be varied for differentncircumnee/inse if lthewhole screeniwere subjected to it with rigid pants would soon result in completely breaking up the apparatus particularlythe screen 'fabric itself and wouldvery materially addtogthepowerrequired. ln my invention the screen is therefore spring su pported on the central vibrating hub by means oil the radialspring barsas indicated. It will be noted that the rigidscreen sections are Supported .on the `spring bars toward` their `outer ends,

that there is no support adjacent the inner ends but that there .is a `support at the center `ofeach screen section. The result of this is that the spring bars 4have sufiicient room to operate and there is a .continuous dancing movement of the `.particles as they travel alongthe screen caused bythe vibrating os cillation `of, the lscreen surface this resulting from the sprung connection between the vibrated member 1and the supjiorting screen frames.;

Vllhe.nfaterjets may or` maynot be used. The `upper jets of courseoperate to distributethemateriali and assist inscreening it.

`The lower jets while they alsodistributethe material outwardly assist inforcing particles back through the screen to preventblinding or clogging of the `apertures inthe screen.. j. y y y ift will be clear `that the degree of oscillastances. For instance, intreating some ymaterialsit might `be necessaryto have both a very Aviolent oscillation and a very full supn ply of distributing and cleaning liquid jets. Other materials.l might be satisfactorily cleaned with very much. less j vilnation` or with, much less liquidonmoisture or with much liquid and little vibration or thereverse. rln other words the operator will, depending upon circumstances, supply more or less liquid` and will. depending on circumstances use a track having, greater or smaller corrugations as the case may be.; n i-have shown the screen section as being a fabric. Clearly the same cleaning result canbe obtained with ascreen made of other material. lltmight be metal or wire or wood orit might be merely a perforated plate.

lt will be` noted that the vibratory more ment 0f thescreen sectionsjs along a line substantially perperdicular" to the screen ,itself sothat the screen is essentially selfwcleaning. ylhe arism 3 in connectionwith screening, where difiicultics so frequently the vi iatonymovement is inclined to the plane of .the screen cannot here arise.` The centrifugal arrangement,` of course, provides .an exceednigly large screening area because the material takes a spiral path and does not `merely travel alone; radial lines. lt goes "from the centralpoint to the discharge area. l` have illustrated my device as a single screen. @bviously this apparatus owing to its relatively low height and` light weight zontally disposed yieldingly screening surface means for rotating it,

can be` built each one as battery. "llhe screens might be arranged one above another onseparate or onthe same shaft as the `case lmay be.`

rlthe spring which holds the shadtV down against the supporting track will prevent jumping or jarring of the driving apparatus and hold the parts rigidly `in position. so that the only springing or dancing or `trembling will be a resultant of `the movement of the roller `and track with respect one to another. rlhere will be nofdancing or bobbing about of the central shaft other than the control. movement. This makes it possible to closely `and accurately control the operation of the screen itself.

The separate screen sections as they wear away or require to be changed can easily be withdrawn from the apparatus merely by releasing the holdinglbolts when new sections may be inserted to replace them or new screens may be added to the old sections. This is done, of course, without interfering in any way with the support of the screen on the spring" bars and does not in any way change the assembly or operation of the device. i y i The support is at the center, the arms swing free,thus greater amplitude and viollen'ce of vibration occurs at the outsidejor j discharge part of the screen. This tends to equalize the amount of `work done` by the `different parts of the screen because in orditached to the driving shaft, means "for" vibrating it, and means for feeding material to it. l f x 2. A centrifugal screen comprising a horizontally disposed yielding supported.

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screening surface means for rotatingiasaid yielding supporting means being rigirlljv attachedtothe driving shadt,` means for vibratingia and means for feeding material to it said supporting and vibrating means conrprising a member and means for moving it vertically and a spring resisting the movement of such member. i

3. llt centrifugal screen comprising a horisupported.

means for vibrating it, and means for feeding` material to it the yielding support-ing means comprising radially arrangedspring bars of central anchoage forthem and means for moving it up and down along a 'vertical' line.

4. A centrifugal screen comprising a horizontally disposed yieldingly supported screening surface means for rotating it, said yielding supporting means being rigidly attached to the driving shaft, means for vibrating it, and means for 'feeding material to it the screen member being free to oscillate about'the central spring support.

5. A centrifugal screen comprising a horizontally disposed yieldingly supported screening surface means for rotating it, said yielding supporting means being rigidly attached to the driving shaft, means for vibrating it and means for feeding material to it said supporting means and vibrating means ycomprising a member and means for moving it vertically and a spring resisting the movement of such membeigthe screen member being free to oscillate about the central spring support.

6. A centrifugal screen comprising a horizontally disposed yieldingly supported screening surface means for rotating it, means for vibrating it, and means for feeding materialto it the yielding supporting lmeans comprising radially arranged spring bars of central anchorage for them and means for moving it up and down along a `vertical` line the rscreen member being free to oscillate about the central spring support.

7. A centrifugal screen comprisinga hub, spring arms projectingoutwardly fromv it, a ring engaging the outer ends of said arms, means for rotating said hub, means for oscillating it along a vertical line and a screeny surface mountedon the arms of the ring. j

8. A centrifugal screen comprising a hub, spring armsprojecting outwardly from it, a ring engaging the outer ends of said arms, means for rotating said hub, means for oscillating it along a vertical line and a screen surface mounted on the arms of the ring such surface made up of a series of separate segments vwhich are removably mounted.

9. A centrifugal screen comprising a hub, spring arms projecting outwardly from it, a

ring engaging the outer ends of said arms,`

means for rotating said hub, means for oscillating it along a vertical line and a screen surface mounted on the arms of the ring such surface made up of a series of separate segments which are removably mounted each segment being in engagement with adjacent segments on either side there being a spring arm between each engaging line.

10; A centrifugal screen comprising a hub, spring arms' projecting outwardly from 1t, a ring engaging the outer ends of said arms, means for rotating said hub, means vfor oscillating it along a vertical line and a screen surface mounted on the arms of the ring such surface made up of a series of separate segments which are removably mounted such segments being themselves rigid.

11. A centrifugal screen comprising a hub, spring arms projecting outwardly from it, a ring engaging the outer ends of said arms, means for rotating said hub, means for oscillating it along a vertical line and a screen surface mounted on the arms of the ring such surface made up of a series of separate segments whichare removably mounted leach segment being 1n engagement with adjacent segments on either side there being a spring arm between each engaging line such segments being themselves rigid.

12. A centrifugal screen comprising a hub, spring arms projecting outwardly from it, a ring engaging the outer ends of said arms, means for rotating said hub, means for oscillating it along a vertical line and a screen surface mounted on the arms of the ring such surface made up of a series of separate segments which are removably mounted such segments being themselves rigid each segment being attached to each arm at two separated points.

13. A centrifugal screen comprising a hub, spring arms projecting outwardly from it, a ring engaging the outer ends of said arms means for rotating said hub, means for oscillating it along a vertical line and a screen surface mounted on the arms of the ring such surface made up of a series of separate segments which are removably mounted each segment being in engagement with adjacent segments on either side there being a spring arm between each engaging line such segments being themselves rigid, each segment being attached to each arm at two separated points.

14;. A centrifugal screen comprising a horizontally disposed yieldingly supported screening surface means for rotating it, said yielding supporting means being rigidly attached to the driving shaft, means for feeding materialto it, and means for vibrating it separate from the yielding supporting` idly attachcd t0 the driving shaft, means' Lampes for Vibrating it, means for feeding material to it the screen member being free t0 Oscillate about the central spring:I support, and means for vibrating it separate from the yielding' supporting; means.

17. A centrifugal screen comprising a horizontally disposed yieldingly supported screening surface means for rotating it, said yielding supporting means being rigidly attached to the driving shaft, means for vibrating it and means for feeding material to it, said supporting means and vibratingr means comprising a member and means for Copies of this patent may be obtained for moving' it vertically and a spring resisting the movement of such member, the screen member being tree to Oscillate about the cen tral spring support, and means for vibrating it separate from the yielding supporting; means.

ln testimony whereof, ll aiiix mysignature in the presence of a Witness this 11th day of July, 1917.

@SCAR M. GRUENDER.

Witness:

g MrNNin M. LINDENAU.

frire cents each, by addressing the Commissioner or Patente,

Washington, D. IU.