US1843791A

US1843791A - Rotary pulp screen

Info

Publication number: US1843791A
Application number: US418048A
Authority: US
Inventors: Stadler John
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-01-02
Filing date: 1930-01-02
Publication date: 1932-02-02
Anticipated expiration: 1949-02-02

Description

1932. J. STADLER ROTARY PULP SCREEN 3 Sheets-Sheet 1 Filed Jan. 2, 1930 Feb. 2, 1932. J. STADLER 1,843,791

ROTARY PULP SCREEN Filed Jan. 2, 1930 5 Sheets-Sheet 2 1 INVENTOR 4? JOHN STQWLER ATTORNEYS F). 2, 1932. J, s E 1,843,791

ROTARY PULP SCREEN Fild Jan. 2, 1950 5 sheets -Sheet 3 54: [I b m? 60 55/ o o INVENTOR JOHN STADLEH ATTORNEYS Patented Feb. 2, 1932 JOHN: STADLER51OF"MON P WW OFFICE CEREAL;- QUEBEC, CANADA" RotrARY PULP seminar Application-V fii'edimiiiar 2, 1930. Serial 1%.: 418,048.

g This invention relates to new and useful improvements in pulp screening devices and the object of: the invention is to provide a combined knotter: and coarse screening j 'de cvice having comparatively large. inlet and discharge openings so that'there" is; no ohst'ruction'to impedethe movement of the pulp throughthe screen-.

Another object of the g videa "combined'knotter and coarse screen",

thedriving; andithe supporting mechanism for 1 which are positiiime'd above the level of the stockon'which'thescreen is operating.

According to y invention providea, screen which'corisists of'a perforated cylinder with. a free inlet opening ationeend. This end is'provided with-wring which is supporte'donits internal surface by aplurality ofrollers which are "positioned abovethe level of the I stock'gin' the screen? :The outlet is' provided with a casting halving spaced arms which are radially disposedto 'a pivot support on suitable-hearings so that there is substantially no obstruction of theilow'erhalf ofth'e cylindrical screen. The screenis rotate'd by' mechanism positioned "above'fthe level of the stock inthe'screen. "An internal shower" pipeof large diameter" is cantilevered from iand supported by thG' TIllGtfCQSt-r ing permits theuse 0i shower water at low". pressure-in large quantities iso that Y the tailingsare free'from finefiibr'es. rt-suitable form" of bafli e is spiralled around 5 the inner: surfaceof the screen to provide a :fi'z'red path 5 along which 'the'material to be screenedor clarified is caused to'travel at avrate ofspeed predetermined to give the best'results, ac-

cord-ing to'the character of'rna'terial being treated; This bafllema'y be'of uniform or irregular. pitch, depending upon the character of the material 'to be screened. :1 In'the' drawings which illustrate m vention; I V Figure 1 isja part sectional plan view of the-screen.

Figure Qisan endview of the screenshown inFigurel;

Figure 3 is EBfSBCtl screen.

invention is to proonal side elevation ofthe Figure 4 is an end view'of the inletlook ing in" the directi0n'44 of Figure 3;

1 view showing. a modified drive] mechanism applied to the 'outletjendof'thescreen. 7 I Figure 6 is anend' view partly in vertical section and partlyin' elevation of the modi-f fied drive mechanism shown in Figure5;

Figure 7 is a planview ofa scraper ele ment. 4

Figure 8 isa sectional viewtaken 'alon'g'the" line 8 8 of Figure 7. p 7 r Referring more particularly to the drawiin'gs, 11 designates a cylindrical screen which may be provided with reinforcing means'l2f nally on a flange ring1 4'which is supported on spaced arms 15 radiating from a bearing hub"l6 support 193which' is positioned abbve ithe) pm; 19 is attached to or formed integral the. screen supported internally} one rim' 23 formed on a disc'24 having a huh'25i' v The "rim'has a flange 27 towh'ijch'isVsecuredbyY any suitable means the roller ringr28'. The

"internalsurfacei29 of the ring "rests on the 32aiid 33"rest 'onthe bearingsurfajces 34a formedin the inlet casting .or such like fined structure. The rollers are drivenfby any suitable means; One form of drive is shown" in the drawingsfor illustrative purposeson'ly and consists" of bevel toothed wheels 34 secured tothe'ends of the roller shafts and adapted to IllGSlI'WltlifbVQl" pinions 35 secured to a common'shaft 36rotatablym-ount- A P 17 extends outwardly. from; I jthe hub into a bearing 18' secured to an" end Figure 5'is a fraginentary'sectional' plan The; screen at'th'e end 13-is supported fint'eri v develofthe stock in 'the' screeningfdevice' and indicated by the numeralQO. The end'sup-j' with the end framefll." The otherjend 22 0i peripheries'oi the spaced rollers 3 0"wh'ich" v are secured to shafts 31 rotatably mounted" in

thetbearings

32 and 33. These bearings which is coii-nected by: any} suitable means:

separated 'fro'm' the inlet "openinwby the-wall '42Jis th'e shower wateriinletr43t e end 44 of U IOU to a vertically disposed shower water conveying pipe, not shown. The end 45 of the inlet 48 has connected thereto a shower pipe 46 extending into the interior of the screen and lying substantially parallel with the longitudinal axis thereof. The shower pipe 46 is cantilevered from the inner end of the inlet casting and is closed at its free end by a cap 47. This shower pipe is positioned above the level of the stock passing through the screen and is providedwith perforations so arranged that the shower of water is direct ed towards the inner surface of the screen at a predetermined angle in order to separate the fine from the coarse material and to free the screen surface of any material that may have a tendency to adhere thereto. A scraper bar 48 is supported between a pair of arms 49 and serves to prevent accumulation of coarse material at the top of the shower pipe 46. One of the arms 49 is secured to the ring 14, while the remaining arm 49 is secured to the disc 24.

It will be seen that in operation a free central opening is provided and that it is comparatively large when compared with the types of screens at present in use. The inlet is combined with the shower pipe inlet and also forms a support for the screen and for the driving mechanism, which is positioned above the stock level. The outlet end is supported on a central pivot and the entire lower half of the screen has substantially no obstruction which would interfere with the flow of tailings therethrough. The screen driving mechanism and supporting means are above the stock level so that there is no danger of same becoming affected by the stock.

The shower pipe is cantilevered from the stock inlet and projects into the screen and is of large dimensions permitting the use of shower water at low pressures in large quantities which assures that the tailings are free from fine fibres and if white shower water is "used, there is no dilution of the accepted without any further treatment.

A bafile 51 is spiralled around the inner surface of the screen 11 to provide a fixed path of travel along which the material is caused to move in the direction of the screen outlet. This baffle may be of uniform or irregular pitch according to the character of material being screened or clarified. Ordinarily, the spiralled baffle will be of irregular pitch so that the drier material approach-v ing the outlet end of the screen is caused to move at a rate somewhat slower than the fresh material entering the inlet end of the screen.

Figures 5 and 6 disclose a modified arrangement in which the drive mechanism is located at the outlet end of the screen. In this arrangement, the screen supporting pin 52 carried by hub 16 extends into a gear casing 53 formed integral with or secured to the end support 19. The pin 52 rotates in a bearing 54 and is provided with a relatively large gear wheel 55. Gear wheel 55 meshes with a similar gear wheel 56 carried by a shaft 57 journalled in suitable bearings 58; shaft 57 also carries a worm wheel 59 meshing with a worm 60 fixed to av-ertically extending shaft 61. The lower portion of shaft 61 is mounted in suitable bearings 62 provided with the casing 58. Shaft 61 passes upwardly, from the casing 53, through a vertical pipe 63, and forms part of a motor 64 carried by the upper end of said pipe. The casing53 is provided with a removable cover 58a and any suitable means may be provided for maintaining the casing supplied with an adequate amount of lubricating oil. A portion of this oil is picked up by the sides of the gear wheel 55 and delivered to a U-shaped scraper 65 provided with an oil receiving a channel 66. The channel 66 is connected by a pipe 67 to the bearing 54 of gear wheel 55 and, by a pipe 68, to the upper bearing 62 of shaft 61. The lower bearing of shaft 61- and the bearings supporting shaft 57 are located below the level of lubricating oil contained in casing 53.

As shown to advantage in Figure 8, the inner walls of the channel 66, lying at opposite sides of the gear wheel 55, are bevelled.

to provide sharpened edges 69 by means of which the oil is scraped from the sides of the gear wheel 55 and deflected into the channel 66 from whence it flows through the pipes 67 and 68 to lubricate the previously mentioned bearings .54 and 62. The scraper 65 may be supported in the casing 53 by any 1 suitable form of bracket such as that indicated at 70. l

Having thus fully described what I now 1,.-

conceive to be thepreferred embodiment of my invention, it will be understood that various modifications may be resorted to within the scope and spirit of the appended claims. 7

Having thus described my invention, what I claim is: I

1. In a screen, a perforated cylinder supported on a disc at one end and radially disposed arms at the other end, an inlet passing through the disc, a ring mounted at the inlet end of the screen'and roller means engaging the internal surface of the ring and the stock in the screen.

2. In a screen, a perforated cylinder, a disc supporting'one end-of the cylinder, a plurality of arms supporting the other end leaving a clear discharge opening, a bearing from which said arms radiate, and driving and supporting means positioned above the high level lineof the stock or material passing through the screen.

3. In a screen, a perforated cylinder, a comparatively large inlet pipe at onerend of the screen, radially ext-ending arms sup-' porting the other end and forming a free exit, a hearing from which the arms radiate, a ring secured to the inlet end of the cylinder and roller supporting means engaging with the internal surface of the ring, said roller means being positioned above the central axis of the cylinder.

4. In a screen, a perforated cylinder, a bearing at one end, a central hub having arms radiating therefrom and adapted to support said cylinder end, a bearing pin extending outwardly from the hub into the bearing, an inlet pipe havin a comparatively large bore, a disc rotata ly mounted on the wall of the pipe and adapted to support the other end of the cylinder, a ring. secured to the disc, and rollers engaging with the internal surface of the ring and adapted to support the other end of the screen, said rollers being positioned above the central axis of the cylinder.

5. In a screen, a perforated cylinder, a

comparatively large inlet pipe, means engaging with the wall of the pipe and adapted to position said cylinder at one end, a central hub having radiating arms adapted to sup-' port the other end of the cylinder, a-bear ing member, a pin extending from the hub into the bearing a roller race ring secured to the inlet end of the cylinder, rollers adapted to engage with the surface of the ring to support and rotate the, cylinder, and means to rotate said screen, said rotating means be ing positioned above the level of the material passingthrough the screen.

6. A cylindrical screen having comparatively large inlet'and outlet openings, a

shower pipe cantilevered from the inlet and extending into the screen, a bearing adapted to support the screen at the outlet end and roller means adapted to support said screen, said roller means being positioned above the central axis of the screen.

7 In a pulp screen, a perforated cylindrical member, an inlet casting at one endthere of, said inlet casting being divided to provide separate passages for the flow of pulp into the screen and also the flow of shower water, a disc surrounding the casting and secured to the screen for positioning same, a hub having radiating arms adapted to support the other end, a pin extending outwardly from the hub, a bearing engaging said pin, a shower plpe secured to the casting and extending surface .ofzth'ecylinder, said-disc ibeing-also" l provided Wlth 'aicentra'l opening, and with"aflange extendingoutwardlynfrom saidrim, a bearing ring carried by said flange, an in let? casting projecting into the cylinder" through the central openingof thejdisc, 'roll ers arranged-within the upper portion ofthe bearing ring in supporting engagementtherewith, said rollers being mounted on'bearings carried by the'inletcastingyand means for I supporting the opposite end of the. cylinder, 93% coarse screening device including'a cylinder, .a'rcentrally apertured disc/having V a rim engaging the inlet end of the cylinder, a bearing ring carried by said disc, a relatively large inlet casting projecting into the cylinder through the central opening of the disc, rollers carried upon the upper portion of said casting in supporting engagement with said bearing ring, a second bearing ring having an inwardly extending rim portion fitting within the opposite end of the cylinder, a

beam supported to extend transversely across the last mentioned end of the cylinder and means for rot-atably supporting the last mentioned bearing ring from said beam.

10. A coarse screening device including a cylinder, a bearing ring secured to the outlet end of said cylinder, means for rotatably supporting said ring, a disc fitted in the inlet end of the cylinder and provided with a central opening, means for rotatably supporting said disc including an inlet casting projecting into the cylinder through the central opening of the disc, a shower pipe extending longitudinally within the cylinder, at scraper 1ocated close to the shower pipe and extending in parallel relation therewith, one end of said scraper being supported from said disc and the other end of said scraper being supported from the bearing ring located at the outlet end of the cylinder.

11. A coarse screening device including a screen cylinder, a bearing ring having an inwardly projecting rim portion secured in the outletend of the cylinder, an end cast-- ing, a beam secured to said casting and ex-' tending transversely across the outlet end of the cylinder, said beam being positioned above the longitudinal axis of the cylinder and said bearing ring being rotatably supported therefrom, a disc fitted in the inlet end of the cylinder and provided with a relatively large s,- central opening, a suitably supported inlet casting projected into the cylinder through i the central opening of said disc, a bearing ring carried by said disc, supporting rollers carried by said inlet casting and serving to support the last mentioned bearing ring, and means for positively rotating one of said bearing rings toimpart a corresponding movement to the screen cylinder.

12. A coarse screening deviceincluding a cylindrical screen member, supporting means at the outlet end of the screen member arranged to leave the lower half of said member substantially unobstructed, a centrally apertured disc closing the inlet end of the screen and formed to provide a support for said end, an inlet casting projecting into the screen member through the central aperture of said disc, a bearing ring fixed to rotate With the inlet end of the screen member, supporting rollers journalled on the inlet casting and engaging said bearing ring, and means for imparting rotation to said screen member through the medium of said bearing ring.

In Witness whereof, I have hereunto set my hand.

JOHN STADLER.