NO128754B

NO128754B -

Info

Publication number: NO128754B
Application number: NO04471/71*[A
Authority: NO
Inventors: R Reinhall
Original assignee: Reinhall Rolf
Priority date: 1970-12-04
Filing date: 1971-12-03
Publication date: 1974-01-07
Also published as: AT321706B; DE2158174B2; CA971418A; FR2117413A5; DE2158174C3; GB1373506A; FI53602B; AU3592171A; SE347688B; US3774528A; DE2158174A1; FI53602C; IT943726B

Description

Presse. Press.

Den foreliggende oppfinnelse vedrorer en presse av skivetype for utpressing av væske fra en væskesuspensjon av cellulosefibre, barkpartikler, vedpartikler, torv e.l., omfattende to roterbare presseskiver, forsynt med perforering, og i det vesentlige anordnet koaksialt og drevet i samme retning, hvorved torkegodset innfores gjennom et innlop til rommet mellom skivene i det punk-tet hvor spalten mellom disse er forholdsvis stor, og hvorved utpressingen av torkegodset finner sted mens torkegodset gjennom skivenes rotasjon medbringes til spaltens smaleste parti for deretter å utmates. The present invention relates to a disc-type press for squeezing out liquid from a liquid suspension of cellulose fibres, bark particles, wood particles, peat etc., comprising two rotatable press discs, provided with perforations, and substantially arranged coaxially and driven in the same direction, whereby the material to be dried is introduced through an inlet to the space between the discs at the point where the gap between them is relatively large, and whereby the drying material is squeezed out while the drying material is brought through the rotation of the discs to the narrowest part of the gap and then discharged.

Tidligere kjente konstruksjoner av en slik pressetype omfatter vanligvis to presseskiver, som i det vesentlige er anordnet koaksialt og forsynt med perforering, hvilke trykkes i retning mot hverandre ved liten tilslutningsvinkel, og som roterer i samme retning. Previously known constructions of such a press type usually comprise two press discs, which are substantially arranged coaxially and provided with perforation, which are pressed in the direction of each other at a small connection angle, and which rotate in the same direction.

Torkegodset innfores mellom skivene der spalten mellom disse er forholdsvis stor og utpressingen av torkegodset skjer ved at torkegodset ved skivenes rotasjon bringes ned til spaltens smaleste parti for deretter å utmates. Skivenes aksler er vanligvis horisontale og den videste delen av spalten, det såkalte gapet, befinner seg over akselene, mens den smaleste delen av spalten er forlagt under disse. The drying material is introduced between the discs where the gap between these is relatively large and the drying material is squeezed out by the rotation of the discs bringing the drying material down to the narrowest part of the gap and then being discharged. The axes of the disks are usually horizontal and the widest part of the gap, the so-called gap, is located above the axes, while the narrowest part of the gap is located below them.

Formålet med oppfinnelsen er å tilveiebringe -en okning, eksempel-vis en fordobling av pressenes kapasitet uten nevneverdig okning av pressenes ytre dimensjoner, og uten vesentlig okning av påkjenningen i de konstruksjonselement som opptar oppståtte pressekrefter ved pressenes anvendelse. The purpose of the invention is to provide - an increase, for example a doubling of the press's capacity without appreciable increase of the presses' outer dimensions, and without a significant increase of the stress in the structural elements that absorb the pressing forces arising from the use of the presses.

Skivepressen ifolge oppfinnelsen kjennetegnes ved at det mellom de to ytre presseskivene er anordnet i det minste en fritt bevegelig perforert presseskive som i det vesentlige er ko- The disc press according to the invention is characterized by the fact that between the two outer press discs there is arranged at least one freely movable perforated press disc which is essentially co-

aksial med disse, hvorved en eller begge ytre presseskiver er utsatt for ytre koaksielt rettet pressetrykk, som via pressé-godset overfores til den eller de ovrige presseskivene. Skivepressen omfatter således et antall roterbare presseskiver som i det vesentlige er anordnet koaksialt og forsynt med perforering. Presseris prinsipielle oppbygning og arbeidsmåte sammenfaller i prinsippet med tidligere kjente konstruksjoner med to rotereende presseskivér, med den forskjell at i den ifolge oppfinnelsen arbeidende pressekbnstruksjon er en eller flere roterbare sentrale presseskiver innfort mellom de to ytre presseskivene og med hvilke oppståtte pressekrefter opptas. axially with these, whereby one or both outer press discs are exposed to external coaxially directed press pressure, which is transferred to the other press disc(s) via the pressed goods. The disc press thus comprises a number of rotatable press discs which are essentially arranged coaxially and provided with perforation. The basic construction and working method of the press coincides in principle with previously known constructions with two rotating press discs, with the difference that in the press kbnstruction working according to the invention, one or more rotatable central press discs are inserted between the two outer press discs and with which the resulting press forces are recorded.

Fordelen med denne konstruksjon er at den mekaniske påkjenningen på de ytre kraftopptagende presseskivene ikke oker samtidig som pressens utvanningskapasitet okes i direkte proporsjon til mellom de ytre skivene plasserte ekstrautvanningsskiver. The advantage of this design is that the mechanical stress on the outer power-absorbing press discs does not increase at the same time as the press's dewatering capacity increases in direct proportion to the additional dewatering discs placed between the outer discs.

Den ifolge oppfinnelsen arbeidende konstruksjon skal beskrives nærmere nedenfor under henvisning til tegningen, hvor The construction according to the invention will be described in more detail below with reference to the drawing, where

fig. 1 viser et delvis snitt av en presse ifolge oppfinnelsen, sett i presseskivenes diametrale retning,og fig. 1 shows a partial section of a press according to the invention, seen in the diametrical direction of the press discs, and

fig. 2 viser pressen i skivenes aksiale retning. fig. 2 shows the press in the axial direction of the discs.

På tegningen betegnes pressens stativ med 50, i hvilket de to ytre presseskivene 12 og 14 er roterbart lagret og mellom hvilke en fritt medroterende dobbeltsidet perforert presseskive 16 er plassert. Samtlige presseskiver 12, 14 og 16 er roterbart opplagret på en ikke roterbar aksel 20. In the drawing, the stand of the press is denoted by 50, in which the two outer press discs 12 and 14 are rotatably stored and between which a freely co-rotating double-sided perforated press disc 16 is placed. All press discs 12, 14 and 16 are rotatably supported on a non-rotatable shaft 20.

De to ytre presseskivene 12 og 14 er roterbart lagret på denne aksel 20 ved hjelp av et til de ytre presseskivene tilkoblet lagerhus 30 resp. 32, og i disse lagerhus plasserte lågere 40 resp. 42. The two outer press discs 12 and 14 are rotatably mounted on this shaft 20 by means of a bearing housing 30 connected to the outer press discs, respectively. 32, and in these warehouses placed lower 40 resp. 42.

De oppståtte aksiale kreftene mellom presseskivene 12 og 14 ved pressens operasjon, som er tilbbyelig til å forskyve presseskivene 12 og 14 i retning fra hverandre, opptas i det her viste utforelseseksempel ved hjelp av hydraulisk trykkmedium, f.eks. olje, tilfort rommet i lagerhuset 30 innenfor et på akselen 20 fastmontert stempel 22, hvilket trykkmedium har et slikt trykk at de derved oppnådde totale aksiale kreftene ut-balanserer helt de ovennevnte separerende kreftene i retning mot rotorene. Dette trykkmedium tilfores via en eller flere ut-borrede kanaler 24 i akselen 20. For separering av rotorene når det onskes, tilfores tilsvarende trykkmedium i kanalen 26, som munner ut i den andre siden av stempelet 22. The resulting axial forces between the press discs 12 and 14 during the operation of the press, which are likely to displace the press discs 12 and 14 in the direction from each other, are taken up in the embodiment shown here by means of hydraulic pressure medium, e.g. oil, supplied to the space in the bearing housing 30 within a piston 22 fixed to the shaft 20, which pressure medium has such a pressure that the total axial forces thus obtained completely balance out the above-mentioned separating forces in the direction towards the rotors. This pressure medium is supplied via one or more drilled channels 24 in the shaft 20. To separate the rotors when desired, a corresponding pressure medium is supplied in the channel 26, which opens into the other side of the piston 22.

Akselen 20 som bærer presseskivene, er båret av to konsoller The shaft 20, which carries the press discs, is supported by two consoles

52, 54 som er forankret på pressens stativ 50. Akselen 20 som bærer presseskivene, er utfort på en slik måte at de to ytre presseskivene 12 og 14 relativt til hverandre og relativt til den utvanningsskiven 16 som er plassert mellom de ytre presseskivene, danner en hensiktsmessig vinkel for å tilveiebringe de onskede kompresjonsforhold ved torkegodsets passasje gjennom pressen. 52, 54 which are anchored to the stand of the press 50. The shaft 20 which carries the press discs is extended in such a way that the two outer press discs 12 and 14 relative to each other and relative to the dewatering disc 16 which is placed between the outer press discs form a appropriate angle to provide the desired compression conditions as the drying material passes through the press.

Akselen 20 er videre slik utfort at presseskiven 16, som er plassert mellom de to ytre presseskivene 12 og 14, hvilken likeledes er opplagret på akselen 20, vil ligge i et plan som deler vin-kelen mellom de to ytre presseskivene 12 og 14 i like deler. The shaft 20 is further extended such that the press disc 16, which is placed between the two outer press discs 12 and 14, which is likewise supported on the shaft 20, will lie in a plane that divides the angle between the two outer press discs 12 and 14 equally parts.

Den sentrale presseskiven 16 er, som nevnte, roterbart opplagret på akselens 20 midtparti, f.eks. på en slik måte som vist i fig. The central press disc 16 is, as mentioned, rotatably supported on the middle part of the shaft 20, e.g. in such a way as shown in fig.

1, ved hjelp av glidelager 44 eller andre lageranordninger, at denne fritt kan forskyves aksielt i rommet mellom de to presseskivene 12 og 14. I og med denne anordning for fri aksial forskyvning av den sentrale presseskiven oppnåes den fordel at de aksiale kreftene som oppstår i de to presseklemmene mellom presseskivene 14 og 16 respektivt 12 og 16, alltid vil utbalansere hverandre helt med hensyn til kreftenes påvirkning på den sentrale presseskiven. 1, by means of sliding bearings 44 or other bearing devices, that this can be freely shifted axially in the space between the two press discs 12 and 14. With this device for free axial displacement of the central press disc, the advantage is achieved that the axial forces arising in the two press clamps between the press discs 14 and 16, respectively 12 and 16, will always completely balance each other with regard to the influence of the forces on the central press disc.

I rommet nærmest akselen 20 mellom de to ytre presseskivene og In the space closest to the shaft 20 between the two outer press discs and

den sentrale presseskiven er det plassert en fleksibel tetnings-anordning 60, 61, som forhindrer at utpresset væske fra torkegodset kan trenge inn mot akselen 20 og det dertil koblede lagerhus. Denne tetning er i foreliggende tilfelle utfort i form av elastiske gummi- eller plastlegemer, hvilke ved montering av pressen for-komprimeres til en slik verdi at disse effektivt forhindrer inntrengning av avpresset væske eller torkegods mot akselen 20. a flexible sealing device 60, 61 is placed on the central pressing disc, which prevents the squeezed out liquid from the drying material from penetrating towards the shaft 20 and the bearing housing connected thereto. In the present case, this seal is formed in the form of elastic rubber or plastic bodies, which are pre-compressed when the press is installed to such a value that these effectively prevent the penetration of pressed liquid or drying material towards the shaft 20.

For å minske friksjonen mellom tetningsringene 60 og 61 og akselen 60,og for å smore den sentrale presseskivens lager 44, tilfores smoreolje under trykk via en oppborret smoreoljekanal 28 i akselen 20. In order to reduce the friction between the sealing rings 60 and 61 and the shaft 60, and to lubricate the central press disc bearing 44, lubricating oil is supplied under pressure via a drilled lubricating oil channel 28 in the shaft 20.

De to roterbare ytre presseskivene 12 og 14 bringes til rotasjon ved hjelp av drivanordninger i form av f.eks. tann- eller kjede-drivningsorgan 34 og 36 på hver rotor. De to drivmotorene 38 The two rotatable outer press discs 12 and 14 are brought into rotation by means of drive devices in the form of e.g. tooth or chain drive means 34 and 36 on each rotor. The two drive motors 38

og 39 kunne arbeide hver for seg eller være mekanisk eller elek-trisk sammenkoblede, dog med det forbehold at de to ytre presseskivene alltid skulle bringes til å rotere med samme hastighet. and 39 could work separately or be mechanically or electrically connected, however with the proviso that the two outer press discs should always be brought to rotate at the same speed.

Den sentrale presse- eller utvanningsskiven 16 er i dette utforelseseksempel ike drevet, men bringes til rotasjon i tomgang ved hjelp av kraftoverforing via tetningsringene 60 og 61, og under pressens arbeidsforlop via det mellom skivene komprimerte torkegodset. The central press or dewatering disc 16 is not driven in this embodiment, but is brought to rotation at idle by means of power transmission via the sealing rings 60 and 61, and during the working process of the press via the drying material compressed between the discs.

Den væskesuspensjon av torkegodset som skal behandles av pressen, tilfores denne via to innlopsåpninger 70 og 71 i pressekappen The liquid suspension of the drying material to be processed by the press is fed to it via two inlet openings 70 and 71 in the press casing

26, hvilke er plassert der spalten mellom presseskivene har maksimal storrelse A. Det innmatede torkegodset komprimeres ved presseskivenes omdreining mot maksimal kompresjon i det punkt der spalten mellom presseskivene når sin minste verdi B, hvorifra det der utvannede torkegodset av skivene transporteres videre opp imot pressens utmatningsåpning 73. 26, which are located where the gap between the press discs has a maximum size A. The fed drying material is compressed by the rotation of the press discs towards maximum compression at the point where the gap between the press discs reaches its smallest value B, from which the dried material that has been diluted by the discs is transported further up towards the discharge opening of the press 73.

Den her viste og beskrevne utforelsesform av oppfinnelsen kan modifiseres på ulike måter innenfor rammen av patentkravene. Selv om bare en sentral presseskive finnes i den viste utforel-sesformen, er det åpenbart at et flertall sentrale skiver kunne anordnes mellom de ytre skivene, hvorved samtlige eller noen må være aksielt, fritt bevegelige for å tilveiebringe den nodven-dige kraftutbalanseringen. Mellom to sentrale skiver kan det aksiale pressetrykket frembringes, hvorved disse er aksielt forskyvbare i retning fra hverandre, mens de ytre presseskivene kunne være aksielt fikserte. Ved dette alternativ kunne enten de sentrale eller de ytre presseskivene være drevet. The embodiment of the invention shown and described here can be modified in various ways within the scope of the patent claims. Even if only one central press disc is found in the embodiment shown, it is obvious that a plurality of central discs could be arranged between the outer discs, whereby all or some of them must be axially, freely movable in order to provide the necessary force balancing. Between two central disks, the axial pressing pressure can be produced, whereby these are axially displaceable in the direction of each other, while the outer pressing disks could be axially fixed. With this option, either the central or the outer press discs could be driven.

Ved en hensiktsmessig modifisering av presseskivene kunne videre perforeringer 75 munne ut i hensiktsmessige sektorformede celler som er skilt fra hverandre, hvilke har individuelle utlopspas-sasjer for å avlede utpresset væske fra respektive celle under bare en del av skivenes rotasjonsomdreining. Disse utlopspas-sasjer kunne hensiktsmessig forbindes med en sugekilde for å lette avledningen. By an appropriate modification of the press disks, further perforations 75 could open into appropriate sector-shaped cells which are separated from each other, which have individual outlet passages to divert squeezed liquid from the respective cell during only part of the disks' rotation. These outlet passages could conveniently be connected to a suction source to facilitate diversion.

Claims

1. Disc-type press for squeezing out liquid from a liquid suspension of cellulose fibres, bark particles, wood particles, peat etc., comprising two rotatable press discs (12,14), provided with perforations (75), and essentially arranged coaxially

and driven in the same direction, whereby the drying material is introduced through an inlet (70, 71) to the space between the discs at the point where the gap between them is relatively large, and whereby the squeezing of the drying material takes place while the drying material is brought through the rotation of the discs to the narrowest part of the gap to then be discharged, characterized in that between the two outer press discs (12, 14) there is arranged at least one freely movable perforated press disc (16) which is essentially coaxial with these, whereby one or both outer press discs are exposed to outer axially directed press pressure, which is transferred via the press material to the other press disc(s).

2. Press according to claim 1, characterized in that compressible sealing rings (60, 61) of elastic material are placed between rotatable press discs (12, 14, 16) connected to the shaft (20) which carries the press discs, and to the dewatering area of the press discs, which sealing rings through the resulting compression forces prevent fluid from penetrating against the shaft that carries the rotors.

3. Press according to claim 1, characterized in that the two outer press discs (12, 14) are connected to hydraulic control means (22) which allow a displacement of the press discs from each other in case of overloading the press.

4. Press according to claim 1, characterized in that a central shaft (20) which passes through the various press discs and carries them, is arranged to absorb all the resulting press forces.

5. Press according to claim 1, characterized in that one or both of the outer press discs are axially displaceable for regulating the compression pressure in the press.

6. Press according to claim 1, characterized in that the press discs (12, 14, 16) behind the perforations (75) are designed with circumferentially separated appropriate sector-shaped cells, which on one side are connected to the slot through the perforations and on the other side has individual outlet passages for the diversion of liquid from a cell during only part of the discs' rotation, possibly by means of a suction source.

7. Press according to one of the preceding claims, characterized in that a plurality of central press discs are arranged coaxially with and displaceable relative to each other between the two outer press discs.

8. Press according to one of claims 1-7, characterized in that the central press disc(s) are freely rotatable and freely axially displaceable stored on the central shaft (20).