SE510553C2

SE510553C2 - Shoe press for a paper or cardboard machine

Info

Publication number: SE510553C2
Application number: SE9703568A
Authority: SE
Inventors: Erik Brox
Original assignee: Valmet Karlstad Ab
Priority date: 1997-09-30
Filing date: 1997-09-30
Publication date: 1999-05-31
Also published as: SE9703568L; DE19843475A1; SE9703568D0; DE19843475C2; AT409978B; ATA162698A

Abstract

The shoe press, for a papermaking machine or a machine for the production of cardboard, has a long press gap (L) between the shoe press (500) and a counter pressure roller (312), to take the web (W) and a continuous blanket (311). At least one hydraulic pressure cylinder (510) is between a horizontal support beam (309), at the press frame, and the counter roller (312), to press the shoe press (500) against the roller (312). The piston (510B) of the cylinder is attached to the support beam. A hydraulic fluid chamber (511) is between the surface of the shoe press towards the cylinder (510) and the cylinder surface, with a channel (508',508') in the shoe press (500) which opens into the hydraulic fluid chamber (511) and is linked to the hydraulic fluid supply. The channel (508',508') is connected to the drilling (506') of a pipe channel, in a loose mounting along the shoe press (500), where the drilling is connected to the hydraulic fluid supply. A pipe channel (503) is loosely integrated into the side of the shoe press (500) towards the cylinder (510) along a longitudinal side edge, and the channel (508') is formed in the wall of the pipe channel. An opening in the pipe channel (503) takes the other end of a channel (508'). The hydraulic fluid chamber (511) is linked to the working chambers (521,521'), through a sleeve (510C) within the cylinder section (510A), with a relatively small base opening (512). A rod (513) extends into the sleeve (510C), attached to the piston (510B), with a head (514) which is larger than the base opening (512) in the sleeve, so that it can close the opening (512). The spring system (540), between the cylinder section (510A) and the piston (510B) of the cylinder (510) is structured to press the cylinder section against the shoe press (500), as a coil spring round the sleeve (510C). The shoe press (500) has hydrostatic sections (501) through channels (508,502) in the shoe press, to distribute the hydraulic fluid to the sections from the supply. The pipe channel (503) has an additional drilling (506), to link the channels (508,502) through an opening in the pipe wall. The pipe channel (503,503') is held at the shoe press (500) by integrated flanges (507), and bolts (505) through the flanges to screw into threaded holes (505') in the shoe press (500).

Description

510 553 10 15 LA) C) b) (ﬂ förhållandet i varje ficka väsentligen oberoende av de Enligt EP-345 501 B2 tryckfluidbelastas också anpressningscylindrarna via andra fickornas tryckförhållanden. kanaler uppborrade i skopressens stativsystem. Likaså används enligt DE-195 15 832 Cl i tem uppborrade kanaler för tryckfluidbelastning av an- skopressens stativsys- pressningscylindrarna, liksom för tryckfluidbelastning av tryckkammaren mellan presskon och anpressningscylindern, via en strypning. 510 553 10 15 LA) C) b) (ﬂ the ratio in each pocket substantially independent of the According to EP-345 501 B2 the pressure cylinders are also loaded via the pressure conditions of the other pockets.channels drilled in the shoe press rack system.Also used according to DE-195 15 832 Cl in ducts drilled channels for pressure fluid loading of the frame press cylinders of the pressure press, as well as for pressure fluid loading of the pressure chamber between the press cone and the pressing cylinder, via a choke.

Uppborrning av stativsystemet, oftast bestående av balkar av stål, av en skopress för tryckfluidbelastning är en omständlig och dyr procedur. De uppborrade kana- lerna är vidare fastlagda, dvs ovarierbara, oföränder- liga.Drilling the frame system, usually consisting of steel beams, of a shoe press for pressure fluid loading is a cumbersome and expensive procedure. The drilled channels are further determined, ie unvariable, unchangeable.

Det föreligger behov att förenkla och förbilliga tryckfluidtillförseln till de ifrågavarande hydrostatiska fickorna/tryckkamrarna och anpressningscylindrarna.There is a need to simplify and reduce the supply of pressure fluid to the hydrostatic pockets / pressure chambers in question and the pressing cylinders.

I DE-195 l4 142 Cl finns en fjäder i anpressnings- cylinderns arbetsrum för att tätande anpressa anpress- ningscylindern mot presskon och förhindra att tryckfluid utträder i sidled. Vidare har den kända skopressen som pressko-tillbakadragande organ ett antal dragstångs- fjäderarrangemang som parvis angriper presskon på lång- sidorna mellan anpressningscylindrarna. Arrangemanget är utrymmeskrävande.DE-195 144 142 Cl has a spring in the working space of the pressing cylinder to seal the pressing cylinder against the press cone and prevent pressure fluid from escaping laterally. Furthermore, the known shoe press as a press shoe retraction means has a number of drawbar spring arrangements which in pairs engage the press shoe on the long sides between the pressing cylinders. The event is space consuming.

Det föreligger också behov av att skapa möjlighet till ett mindre utrymmeskrävande pressko-tillbakadragande organ.There is also a need to create the possibility of a less space-consuming press shoe retraction member.

Föreliggande uppfinning möter nämnda behov med en skopress med kännetecknen i patentkravet l. Fördelaktiga utföringsformer av uppfinningen har kännetecknen i de osjälvständiga patentkraven.The present invention meets said need with a shoe press with the features of claim 1. Advantageous embodiments of the invention have the features of the dependent claims.

Bland väsentliga fördelar som uppfinningen ger skall nämnas: - Låg kostnad: profilrör kan framställas billigare än precisionsborrade kanaler i stativdelar. 10 15 20 25 30 35 510 553 - Lätt och billigt att modifiera en skopress försedd med ett sådant profilrör: t ex för ändring av diameter/- strypningsdimension.Among the significant advantages that the invention provides should be mentioned: - Low cost: profile tubes can be manufactured cheaper than precision drilled channels in frame parts. 10 15 20 25 30 35 510 553 - Easy and cheap to modify a shoe press equipped with such a profile tube: for example for changing the diameter / choke dimension.

- Profilmaterialet är valbart. Hänsyn kan tagas till kanalbearbetningsnog- olika krav, t ex värmeexpansion, grannhet. Presskon består inte sällan av aluminium. Också profilröret kan bestå av aluminium och enkelt framställas genom extrudering.- The profile material is selectable. Duct processing can be taken into account - different requirements, such as thermal expansion, accuracy. Press cone often consists of aluminum. The profile tube can also be made of aluminum and easily manufactured by extrusion.

- Samtliga arbetsrum och tryckkamrar och eventuellt också hydrostatiska fickor kan matas med tryckfluid genom en enda detalj, dvs profilröret, som i sin tur kan matas enkelt och snabbt med tryckfluid, genom den ena änden eller genom båda ändarna.- All workrooms and pressure chambers and possibly also hydrostatic pockets can be fed with pressure fluid through a single part, ie the profile tube, which in turn can be fed easily and quickly with pressure fluid, through one end or through both ends.

Ett utföringsexempel på uppfinningen skall nu be- skrivas närmare under hänvisning till bifogade ritning, som visar de för uppfinningens förståelse väsentliga skopressdelarna i tvärsektion, varvid det är underför- stått att presskon är ett enda stycke, som sträcker sig i tvärmaskinriktningen, medan anpressningscylindrar, hydro- statiska fickor, tryckkamrar kan vara flera till antalet, fördelade i presskons längdriktning.An embodiment of the invention will now be described in more detail with reference to the accompanying drawing, which shows the shoe press parts essential for the understanding of the invention in cross section, it being understood that the press shoe is a single piece extending in the cross machine direction, while pressing cylinders, hydro static pockets, pressure chambers can be several in number, distributed in the longitudinal direction of the press cone.

Det hänvisas nu till ritningen. Den där visade sko- pressen för en pappers/kartongmaskins pressektion har de konventionella detaljerna pressko 500 och motvals 312, vilka mellan sig bildar ett långnyp N, i vilket en pappers- eller kartongbana W löper tillsammans med en cirkulerad pressmantel 311 och en pressfilt F. En i skopressens stativsystem ingående horisontell balk har hänvisningssiffran 309.Reference is now made to the drawing. The shoe press shown there for the press section of a paper / board machine has the conventional details press shoe 500 and counter roll 312, which between them form a long nip N, in which a paper or board web W runs together with a circulating press jacket 311 and a press felt F. A horizontal bar included in the frame system of the shoe press has the reference numeral 309.

Enligt uppfinningen är presskons på sin från mot- valsen 312 vända sida utformad med ett urtag 520 som 503 har flänsar 507, med hjälp av vilka profilröret 503 är mottager ett rakt profilrör 503. Profilröret löstagbart fastskruvat på nämnda sida medelst skruv/- skruvhålsförband 505,505'.According to the invention, the press cone on its side facing away from the counter-roller 312 is formed with a recess 520 which 503 has flanges 507, by means of which the profile tube 503 is receiving a straight profile tube 503. The profile tube is releasably screwed on said side by means of screw / screw hole connections 505,505 '. .

Profilröret 503 innehåller två i rörets längd- 506'. riktning löpande parallella kanaler 506, Kanalen 510 553 10 20 25 30 506 tryckfluidförsörjer via i presskon upptagna borr- ningar 502 hydrostatiska fickor 501 (i och för sig kända)i presskons 503 mot motvalsen 312 vända sida. En borrning 502 svara mot en ficka 501. Tryckfluiden har smörjande funktion på pressmanteln 311. För nämnda för- sörjning finns en strypborrning 508 i profilrörets 503 mot presskon vända vägg, vilken strypning 508 sörjer för begränsning av tryckfluidflödet till fickan. Kanalen 506'tryckfluidförsörjer via en borrning 508' i profil- rörets 503 från presskon vända vägg arbetsrummet 521 i en hydraulisk anpressningscylinder 510, bildad av cylinder 510A och kolv 5l0B, såsom visas. Också borrningen 508' är utformad som en som är fastskruvad i balken 309, strypning, så att eventuell tryckfluidläckning från någon av anpressningscylindrarna 510 ej har större inflytande på de andra anpressningscylindrarnas operation. I topp- ytan av cylinderdelen 510A finns en urtagning som bildar en tryckkammare 511, vilken avgränsas av en 0-tätning 530 och i vilken strypningen 508' mynnar. Tryckkammaren 511 kommunicerar sålunda också med arbetsrummet 521. Den täcks av profilröret 503, såsom framgår i figuren.The profile tube 503 contains two in the length 506 'of the tube. parallel channels 506, the channel 510 553 10 20 25 30 506 supplies pressure fluid via hydrostatic pockets 501 (known per se) in press cone 503 facing the counter roller 312 via bores 502 accommodated in press cone. A bore 502 corresponds to a pocket 501. The pressure fluid has a lubricating function on the press jacket 311. For said supply there is a throttle bore 508 in the profile tube 503 against the wall facing the press cone, which throttle 508 provides for restricting the flow of pressure fluid to the pocket. The duct 506 'supplies pressure fluid via a bore 508' in the profile tube 521 of the profile tube 503 facing the press cone into a hydraulic pressing cylinder 510, formed by cylinder 510A and piston 51B, as shown. The bore 508 'is also designed as one which is screwed into the beam 309, throttling, so that any pressure fluid leakage from any of the pressing cylinders 510 has no major influence on the operation of the other pressing cylinders. In the top surface of the cylinder part 510A there is a recess which forms a pressure chamber 511, which is delimited by an O-seal 530 and into which the throttle 508 'opens. The pressure chamber 511 thus also communicates with the working space 521. It is covered by the profile tube 503, as shown in the figure.

Tryckkammarens 511 kommunikation med arbetsrummet 521 sker via det inre av en hylsa 5l0C med en bottenöppning 512, vilken hylsa bildar del av cylinderdelen 510A och vilket I botten av detta urtag sträcker sig in i ett urtag 521 i kolven 5108, urtag är del av arbetsrummet 521. 521' hylsan 5l0C. öppning 512, är inskruvad en skruv 513, som har ett huvud 514 i Detta huvud 514 är större än hylsans botten- varvid denna omger skruvens skaft med av- stånd, så att en strypning bildas. En skruvfjäder 540 omsluter hylsan 5l0C och är förspänd mellan urtagets 521' botten och cylinderdelens 510A undersida för tätande anpressning av cylinderdelen 5l0A mot presskon. En O-tät- ning mellan kolv 51OB och cylinderdel 510A har hänvis- ningssiffran 550.The communication of the pressure chamber 511 with the working space 521 takes place via the interior of a sleeve 510C with a bottom opening 512, which sleeve forms part of the cylinder part 510A and which at the bottom of this recess extends into a recess 521 in the piston 5108, recess is part of the working space 521 521 'sleeve 510C. opening 512, is screwed a screw 513, which has a head 514 in This head 514 is larger than the bottom of the sleeve- this surrounds the shaft of the screw with spacing, so that a choke is formed. A helical spring 540 encloses the sleeve 510C and is biased between the bottom of the recess 521 'and the underside of the cylinder part 510A for sealingly pressing the cylinder part 51A against the press cone. An O-seal between piston 51OB and cylinder part 510A has the reference numeral 550.

Hylsan 5l0C är dimensionerad med hänsyn till den önskade fulla slaglängden av anpressningscylindern 510 så 10 15 510 553 att när denna fulla slaglängd uppnåtts under inverkan tryckfluid tillförd till arbetsrummet 521, stryper skru- vens 513 huvud 514 bottenöppningen 512. Härvid tvingas tryckfluid att strömma ut i sidled från tryckkammaren 511. Arrangemanget av hylsa 51OC, skruv 513 och fjäder 540 kan alltså ses som en slaglängdsbegränsare for anpressningscylindern.The sleeve 51C is dimensioned with respect to the desired full stroke of the pressing cylinder 510 so that when this full stroke is reached under the influence of pressure fluid supplied to the working space 521, the head 513 of the screw 513 restricts the bottom opening 512. laterally from the pressure chamber 511. The arrangement of sleeve 51OC, screw 513 and spring 540 can thus be seen as a stroke limiter for the pressing cylinder.

Det skall framhållas att uppfinningen är, vad gäller profilrörsarrangemanget, inte begränsat till placering av profilroret på undersidan av presskon. Ett profilror for matning av tryckkamrarna 511, och om så önskas, även de hydrostatiska fickorna 501, med tryckfluid kan alter- nativt lösbart fastsättas på en làngkantssida av presskon 500, vilket antydes med streckad linje och hänvisnings- siffran 503', varvid strypningen 508" i profilrorsväggen kommunicerar med en i presskon 500 upptagen borrning 508"', som mynnar i tryckkammaren 511.It should be emphasized that the invention is, with regard to the profile tube arrangement, not limited to the placement of the profile tube on the underside of the press cone. A profile tube for feeding the pressure chambers 511, and if desired, also the hydrostatic pockets 501, with pressure fluid can alternatively be releasably attached to a long edge side of the press cone 500, as indicated by the dashed line and the reference numeral 503 ', the choke 508 " in the profile tube wall communicates with a bore 508 "'received in the press cone 500, which opens into the pressure chamber 511.

Claims

510 553 10 15 20 25 30 35 PATENT REQUIREMENTS

Shoe press for a paper or board machine, comprising - a press shoe (500), - a counter-roller (312), which press shoe and counter-roller between them form a long nip (N) for a paper or cardboard web (W) and for a circulating one. flexible belt (311), - at least one hydraulic pressing cylinder (510) between a horizontal support beam (309) (312), press cone (500) (312) included in the frame system of the shoe press, the piston of the ning cylinder is attached to said support beam, and the counter roller for pressing facing counter roller (51OB) (511) (510) and arranged to be provided with a pressure fluid from a pressure fluid source, the pressure cylinder of which the pressure fluid chamber communicates. the working space (521, 521 ') of the cylinder is characterized by a channel (508'; 508 "') arranged in the press cone (500) which opens into the pressure fluid chamber (511) and is connectable to the pressure fluid source.

Shoe press according to claim 1, characterized in that the channel (508; 508 '') communicates with the bore (506 ') of a tube detachably attached to the press cone (500) in its longitudinal direction, which bore is connectable to the pressure fluid source.

Shoe press according to claim 2, characterized in that the tube (503) is releasably recessed in the press cone (500) (510) the channel is formed in the wall of the tube. facing the pressing cylinder and that (508 ')

Shoe press according to claim 2, characterized in that the tube (503) is releasably attached to one long edge side of the press cone (500) and has an opening in its wall, in (508 "') which the other end of the channel opens. (511) denotes with said working space 521 ') via a sleeve (510C), (510A) attached thereto and has a relatively smaller bottom opening (512). k ä n n e t e c k n a d

Shoe press according to any one of claims 1-4, that the pressure fluid chamber (521; extending inside the cylinder part t e c k n a d thereof, communicates

Shoe press according to claim 5, thereof, (51 ° C) extends a rod (513) attached to the piston (510B) with a head (514), larger than the bottom opening (512) of the sleeve so that in the sleeve which is closed the bottom opening (512).

A shoe press according to any one of claims 5 and 6, (540) cylindrical means that a spring means (510) for pressing the cylinder characteristic thereof, is arranged between the part (510A) of the pressing cylinder and the piston (510B), the part against the press cone ( 500).

Shoe press according to claim 7, characterized in that the spring means is a helical spring, which encloses (51OC).

Shoe press according to one of Claims 1 to 8, in which (500) (501) is a source of pressure fluid (501) provided in channels 502).

Shoe press according to any one of claims 2-9, that (503) which communicates with the channels thereof, the sleeve has hydrostatic pockets known e- (500) (508, for supplying the pockets with pressure fluid from a press cone - has another (508, 502) drawn therefrom, the tube (506), an opening in the tube wall.

Shoe press according to one of Claims 2 to 10, characterized in that the tube (503, 503 ') is fastened to the press cone (500) by means of a one (507).

Shoe press according to claim 11, characterized in (503, 503 ') by means of screws (505') passed through the flanges. is a releasable piece flanges formed therewith are attached to the press cone (505) d thereof, that the tube (500) press cone accommodated screw holes and in 510 553

Shoe press according to one of Claims 2 to 12, characterized in that the tube (503, 503 ') is extruded from aluminum.