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EP2508672B1 - Dispositif destiné au transfert d'un bande dans une station d'une machine de fabrication de bandes ou de traitement - Google Patents

Dispositif destiné au transfert d'un bande dans une station d'une machine de fabrication de bandes ou de traitement Download PDF

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Publication number
EP2508672B1
EP2508672B1 EP20120002280 EP12002280A EP2508672B1 EP 2508672 B1 EP2508672 B1 EP 2508672B1 EP 20120002280 EP20120002280 EP 20120002280 EP 12002280 A EP12002280 A EP 12002280A EP 2508672 B1 EP2508672 B1 EP 2508672B1
Authority
EP
European Patent Office
Prior art keywords
nozzles
individual nozzles
web
nozzle
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20120002280
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German (de)
English (en)
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EP2508672A1 (fr
Inventor
Andreas Pesch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters GmbH
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Filing date
Publication date
Application filed by Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP2508672A1 publication Critical patent/EP2508672A1/fr
Application granted granted Critical
Publication of EP2508672B1 publication Critical patent/EP2508672B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the invention relates to a device for transferring a web in a station of a web manufacturing or processing machine according to the preamble of claim 1.
  • a narrow strip of the web is usually first transferred. To convert this strip different units are used. In dry groups, for example, so-called blowing scrapers are used for the transfer. These essentially consist of two or more nozzle arrangements. In this case, a nozzle is usually directed against the running paper web to lift the leader from a cylinder and another nozzle assembly to further promote the leader by means of an air flow in the paper direction.
  • the webs between the grooves act like a ski jump and lead the web strip away from the scraper.
  • This has serious disadvantages.
  • it can lead to the formation of a so-called double stripe.
  • the web strip is detected later by the delivery nozzles, while the strip tip already strays through the machine.
  • the direction reversal must be compensated again during the promotion of the air nozzles, resulting in a loss of efficiency.
  • centrifugal forces become effective which must increase and be balanced with higher web weight and higher web speed. Disadvantages are in this respect also the turbulence becoming stronger with the strength of the air flow.
  • Out EP 0 868 571 B1 is a drying section with at least one of the transfer of a EinfädelstMails serving nozzle device is known, which has at least two in the conveying direction of the web arranged one behind the other nozzle means.
  • the first nozzle device has individual nozzles, and the downstream second nozzle device comprises slot nozzles.
  • the blowing air is guided through Heil outsnuten, so that the above-mentioned disadvantages occur here in the same way.
  • the second nozzle device arranged downstream of the first nozzle device comprises slot nozzles which allow the formation of a improve the performance of the airstrip, but at the expense of high air consumption. The efficiency of these slot nozzles is therefore low.
  • the object of the invention is therefore to provide a device for transferring a web in a station of a web manufacturing or processing machine, which is simple in construction and has an improved efficiency.
  • a device for transferring the web which improves the behavior of the individual jets of a row of nozzles to form an air carpet.
  • the connection of the individual flows to a total flow, ie to an air gap, is improved by the fact that the flow fields of the individual flows are at least partially directed differently.
  • a certain disorder is set by a predetermined assignment. As a result, it is no longer left to chance, with which neighbor flow the first connection is received, but the nozzles are arranged so that a connection order is clearly specified.
  • nozzle tubes for example, have a pair of different hole spacing, are not arranged in pairs parallel to each other.
  • a combination of the two principles is adjustable.
  • the nozzle tubes of the second nozzle device are arranged below a cover plate.
  • the paper or edge strip is thereby protected from direct contact with the nozzles.
  • a further row of nozzles is preferably provided, which is provided on the start side of the surface of the cover plate.
  • These further nozzles are preferably designed as Coanda nozzles.
  • the nozzles of the further nozzle row can be perforated or slot nozzles.
  • the Coanda design has the advantage here that the individual beams very quickly become a uniform air carpet.
  • the air flow does not have to be particularly strong, because it does not pursue the purpose of conveying the paper strip over a long distance.
  • the second nozzle device is provided.
  • the air carpet at the top of the cover plate and the free jet zone at the bottom of the cover plate connect at the end of the cover plate.
  • the inflowing air at the top of the cover plate also eliminates the Vacuum areas between the flows of the free-jet nozzles. This leads to a substantial calming of the flow.
  • the vortex formation is significantly reduced.
  • the nozzle bores of the Coanda nozzles are preferably arranged between the individual nozzles of the second nozzle device.
  • the device according to the invention is also robust and requires little maintenance.
  • the consumption of propellant is considerably reduced compared to known devices.
  • the invention relates to a device for transferring a web in a station of a web-making or processing machine.
  • the web-forming machine can be designed as a paper or board machine as well as a woven or pulp machine.
  • the Fig. 1 shows a web-making machine with a dryer section 1, which upstream of a machine production process 2 and a machine production process 3 is arranged downstream.
  • the drying section 1 has a plurality of drying cylinders 4.
  • the dryer section 1 scraper or doctor blade 5, which Bruauf arrangementsbaumaschine 6 are assigned.
  • each dryer cylinder 4 is a scraper 5 and a Bahnauf arrangementsbauteil 6 assigned.
  • An edge strip 7 of a web which is considerably narrower in comparison with the actual production width, is supported by means of the web guide members 6 for transporting through the dryer section 1 and supported by gas flows.
  • the drying section 1 further comprises dryer fabrics 8 and guide rolls 10 in a known manner.
  • the drying cylinders 4 are rotatably mounted in a frame 9. Between the rotating drying cylinders 4 results in a free running distance 11 for the material web.
  • On the jacket of the drying cylinder 4 is a scraper blade 12 of the respective scraper 5 at.
  • the scraper blade 12 serves to prevent winding of a cracked web on the drying cylinder 4 and separates the latter from the drying cylinder 4 when an edge strip 7 is being fed.
  • the scraper blade 12 therefore preferably extends over the entire width of the drying cylinder 4.
  • the scraper 5 also preferably forms a holder for a web-laying component 6.
  • the scraper 5 is pivotally mounted on / with an axle 13 mounted on the frame 9.
  • the scraper blade 12 and the web-laying component 6 are therefore alignable to the respective drying cylinder 4 and the free running distance 11 between two drying cylinders 4.
  • the alignment is preferably about an axis 13 which extends in the cross-machine direction.
  • Fig. 3a shows the Bahnauf arrangementsbaumaschine 6 each comprise a device for transferring a web in a station of a web-making or processing machine, in particular for guiding the edge strip 7 of a material web.
  • an edge strip 7 is carried and guided on the free running distance 11 between two drying cylinders 4.
  • the device comprises for this purpose a guide device 14 which extends along a path of the edge strip 7 in the conveying direction L of the running section 11.
  • the guide 14 is attached to the scraper 5 and pivotally with this for alignment with the running distance 11, such as Fig. 1 shows.
  • the guide device 14 which is preferably an air guiding device, is associated with a first nozzle device 15 on the inlet side, ie adjacent to the doctor blade 12.
  • this first nozzle device 15 on individual nozzles 16, which serve to generate a first gas flow 17.
  • the first gas flow 17 runs essentially counter to the conveying direction L of the edge strip 7 and extends transversely to the conveying direction L and preferably in the cross-machine direction.
  • a plurality of individual nozzles 16 forms the gas flow 17, which acts on the edge strip 7 in its entire width, so that the gas flow 17 also acts on the edge region of the edge strip 7.
  • the individual nozzles 16 are arranged at a distance from one another.
  • the guide device 14 is further associated with the outlet side, a second nozzle device 18, which serves to generate a second gas flow 19, which extends substantially in the conveying direction L.
  • the jet width of the second gas flow 19 also extends transversely to the conveying direction L and preferably in the cross-machine direction.
  • the individual nozzles 16 of the first nozzle device 15 protrude into mixing chambers 20 in which the respective fluid jet 21 emerging from the individual nozzle 16 forms a propulsion jet.
  • the fluid jet 21 exits the individual nozzle 16 at the highest possible speed.
  • the mixing chamber 20 forms a cavity-shaped portion in which normal pressure prevails. At the cavity-shaped portion may be followed by a Gas.leitweg 22. This Gas Centersleitweg 22 is for example an angled or rounded depression.
  • the mixing chambers 20 and optionally the Gas arrangementleitwege 22 are arranged in a guide plate 23, which via fastening means 24 (see. Fig. 7 ) is preferably attached to the guide 14.
  • the guide plate 23 can be pierced.
  • the respective fluid jet 21 accelerates in the associated mixing chamber 20 a suction medium, which nach kitchent a suction flow 25 for controlling an air flow 26 on a Laufwegabites 27 between the two gas flows 17, 19.
  • a suction medium which nach Vietnameset a suction flow 25 for controlling an air flow 26 on a Laufwegabites 27 between the two gas flows 17, 19.
  • This suction flow 25 causes air to be sucked in at the top of the guide device 14. Consequently, a suction zone is created which acts on the edge strip by sucking it and applying itself to the guide device 14.
  • the centrifugal forces that would force the edge strip 7 a curved track are compensated.
  • the marginal strip 7 or strip strip is passed on optimally to the second nozzle device 18 and its (conveying) gas flow 19.
  • the suction flow 25 is, for example, according to the in Fig. 3a illustrated first embodiment of a rear wall 28 of the mixing chamber 20, a passage opening 29 is formed so that the vacuum present there nach coin calendart the suction flow 25.
  • This suction flow 25 passes through the guide device 14, which sucks the air flow 26 at the upper side of the guide device 14 via air inlet openings or suction openings 30. It thus leads to the top of the guide 14 are formed.
  • a positioning of the air inlet openings 30 between the two gas flows 17, 19 on the Laufwegabites 27 in the conveying direction L can be influenced on the application of the edge strip 7 to the guide 14.
  • the air flow 26 is thus controlled by the fact that the suction flow 25 at the top the guide 14 is present.
  • the air inlet openings 30 are preferably individual openings, which are provided in a cover plate 31.
  • the cover 31 is perforated for this purpose, for example.
  • the number of air inlet openings 30 is selectable and is not predetermined by the number of mixing chambers 20 Fig. 4 to Fig. 6 For example, twelve mixing chambers are 20 and twenty-two Air inlet openings 30 are provided.
  • the opening width of the air inlet openings 30 can be adjusted according to the application.
  • FIG. 3b illustrated second embodiment differs from the first embodiment described above in that the cover plate 31 is omitted.
  • the suction flow 25 inadvertently sucks in air at the upper side of the guide device 14, since the passage opening 29 of the respective mixing chamber 20 can act freely to the upper side of the guide device 14.
  • the control of the air flow 26 in the region between the two gas flows 17, 19 is limited to a virtually free suction at the top of the guide 14, whereby Störströmept 32 can not be completely avoided, which preclude the best possible application of the edge strip 7. Nevertheless, compared with the prior art, there is a significant improvement in the guidance of the edge strip 7.
  • FIG. 3c illustrated embodiment differs from the first embodiment in that the air inlet openings are formed as suction nozzle 33 in the upper-side wall 34 of the respective mixing chamber 20.
  • the number of suction nozzle 33 then corresponds to the number of mixing chambers 20 and the number of individual nozzles 16.
  • the suction nozzle 33 form supply lines for the air flow 26, which in turn can be controlled.
  • the first nozzle device 15 which is the foremost nozzle device in the conveying direction L, comprises a feed tube 35, which forms a blowpipe, from which the individual nozzles 16 are supplied with gas, in particular air. Pressure and flow rate of the supplied gas can be set according to the application.
  • the gas flow 17 of the first nozzle device 15 preferably extends at an angle to the jacket of the drying cylinder 4. The gas flow 17 causes that a gas or air film on the guide 14 is formed, which carries the edge strip 7 of the material web and passes on. Through the nozzle row forming individual nozzles 16 an air carpet is formed.
  • the following second nozzle device 18 has a second feed tube 36, which likewise forms a blowpipe, from which the gas stream 19, in particular an air stream, emerges.
  • the second nozzle device 18 may be formed in a known manner.
  • the second nozzle means 18 comprises a plurality of second single nozzles 37 arranged in series which are fed by the second feed pipe 36.
  • the first individual nozzles 16 and the second individual nozzles 37 are preferably designed as free jet nozzles, in particular hole nozzles.
  • the following is preferably provided.
  • the individual nozzles 37 are arranged below a cover plate 38.
  • the edge strip 7 is thereby protected from direct contact with the individual nozzles 37.
  • the individual nozzles 37 are preferably free-jet nozzles, which are formed by nozzle tubes.
  • a further row of nozzles 39 is located on the front side of the cover plate 38, which produce an air gap of an air flow 40 on the cover plate 38.
  • These further nozzles 39 are preferably designed as Coanda nozzles. As a result, the gas or air jet can be guided so that the zone of the jet outlet does not experience any direct contact with the edge strip 7.
  • the nozzles 39 may be designed as a hole or slot nozzles.
  • the Coanda design has the advantage that the single beams form a uniform air carpet very quickly.
  • the gas or air flow must Not to be particularly strong, because it does not pursue the purpose of promoting the edge strip over a long distance.
  • the individual nozzles 37 are provided.
  • the gas, in particular air flows 19, 40 connect at the end of the cover plate 38 and generate a sufficient pressure cushion.
  • the further nozzles 39 are preferably each arranged between two individual nozzles 37.
  • the cover plate 38 preferably has a diaphragm length in the conveying direction L which is greater than a length of the individual nozzles 37 of the second nozzle device 18.
  • the gas supply via the supply pipes 35, 36 may have different pressures and be controlled accordingly.
  • Fig. 8a shows the guide 14 according to Fig. 4 showing the arranged under the cover plate 38 individual nozzles 37 of the second nozzle device 18.
  • Fig. 9a recognizes that in a parallel and evenly spaced arrangement of the individual nozzles 37 in a row of nozzles first turbulence fields 41 between two individual nozzles 37 and second turbulence fields 42 between the flow fields 43 of the individual nozzles 37 occur, which lead to vortex formation within the total flow 44.
  • Fig. 8a a constricting effect.
  • the individual nozzles 37 of the second nozzle device 18 are designed as nozzle tubes and generate flow fields 43 which are directed at least partially differently.
  • Fig. 8c the arranged in a row line inside individual nozzles 37 are arranged in pairs, with a greater Reihungsabstand between two pairs than between the two forming a pair of individual nozzles 37th
  • the associated flow pattern according to Fig. 9c illustrates the reduction of turbulence, since the turbulence fields 42 are missing. This follows from the fact that the flow field of a single nozzle 37 is co-determined in its direction by the respective adjacent individual nozzle 37. The different arrangement distances 45, 46 have differently directed flows of the individual nozzles 37 of a pair 37.1, 37.2 result.
  • Fig. 8d are arranged in a Reihungsfinie inside single nozzles 37 pairs of different lengths nozzle tube.
  • the individual nozzles 37.3 and 37.4 are formed, for example, with shorter nozzle tubes.
  • the different lengths have differently directed flows of the individual nozzles 37 of a pair 37.3, 37.4 result.
  • the associated flow pattern according to Fig. 9d illustrates the reduction of turbulence, since the turbulence fields 42 are missing.
  • Fig. 8e are arranged in a row line arranged inside individual nozzles 37 pairwise angled towards each other.
  • the associated flow pattern according to Fig. 9e shows the individual nozzles 37.5 and 37.6 of a pair. Again, the turbulence fields 42 are missing.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Advancing Webs (AREA)

Claims (11)

  1. Dispositif de convoyage d'une bande dans une section d'une machine de fabrication ou de traitement de bande, en particulier pour le guidage d'une bordure de rive (7) d'une bande de matériau, comprenant un dispositif de guidage (14) qui s'étend le long d'une piste de parcours de la bande et qui comporte en amont un premier dispositif de buses (15), qui comporte des buses individuelles (16), lesquelles servent à produire un premier flux de gaz (17), qui circule essentiellement à l'encontre de la direction de convoyage (L) de la bande de matériau, et qui comporte en aval un deuxième dispositif de buses (18), qui comporte des buses individuelles (37), lesquelles servent à produire un deuxième flux de gaz (19), qui circule essentiellement dans ladite direction de convoyage (L), et où lesdites buses individuelles (16, 37) sont des buses à jet libre, où lesdites buses individuelles (37) du deuxième dispositif de buses (18) sont constituées sous la forme de tubes gicleurs, caractérisé en ce que lesdites buses individuelles (37) du deuxième dispositif de buses (18) génèrent des champs d'écoulement, qui sont au moins partiellement orientées différemment, et qui sont liés à un écoulement global.
  2. Dispositif selon la revendication 1, caractérisé en ce que lesdites buses individuelles (37) ordonnées vers l'extérieur dans une rangée sont agencées angulairement par rapport à un angle issu d'un centre de jet.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que lesdites buses individuelles (37) ordonnées vers l'intérieur dans une rangée, sont agencées convergeant angulairement par paires.
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que lesdites buses individuelles (37) ordonnées vers l'intérieur dans une rangée sont agencées par paires, et où la distance de rangée est plus grande entre deux dites paires qu'entre deux dites buses individuelles (37) formant une paire.
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que lesdites buses individuelles (37) ordonnées vers l'intérieur dans une rangée comportent des tubes gicleurs de longueur différente d'une paire à l'autre.
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que ledit deuxième dispositif de buses (18) est disposé au-dessous d'une tôle de couverture (38).
  7. Dispositif selon la revendication 6, caractérisé en ce que d'autres buses (39) sont agencées au niveau dudit deuxième dispositif de buses (18), qui sont formées de buses de type Coanda, et qui provoquent un flux d'air à la partie supérieure de ladite tôle de couverture (38).
  8. Dispositif selon la revendication 7, caractérisé en ce que ladite tôle de couverture (38) comporte une longueur de tôle, qui est plus grande qu'une longueur desdites buses individuelles (37) dudit deuxième dispositif de buses (18).
  9. Dispositif selon l'une des revendications 1 à 8, caractérisé en ce que lesdites buses individuelles (16) dudit premier dispositif de buses (15) sont saillantes dans des chambres de mélange (20), dans lesquelles le courant de fluide (21) correspondant forme un jet de propulsion, qui accélère un moyen d'aspiration dans ladite chambre de mélange (20) correspondante, lequel moyen d'aspiration extrait un flux d'aspiration (25) pour le pilotage d'un flux d'air (26) sur une partie supérieure dudit dispositif de guidage (14) entre lesdits deux flux gazeux (17, 19).
  10. Dispositif selon la revendication 9, caractérisé en ce que lesdites chambres de mélange (20) comportent des buses d'aspiration (33), sur lesquelles ledit moyen d'aspiration peut être guidé d'un côté supérieur dudit dispositif de guidage (14).
  11. Dispositif selon la revendication 9, caractérisé en ce qu'un passage (29) est formé au niveau d'une cloison arrière (28) desdites chambres de mélange (20), et forme un accès pour ledit flux d'aspiration (25).
EP20120002280 2011-04-08 2012-03-29 Dispositif destiné au transfert d'un bande dans une station d'une machine de fabrication de bandes ou de traitement Active EP2508672B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011016587A DE102011016587A1 (de) 2011-04-08 2011-04-08 Vorrichtung zum Überführen einer Bahn in einer Station einer Bahn-Herstellungs- oder Verabeitungsmaschine

Publications (2)

Publication Number Publication Date
EP2508672A1 EP2508672A1 (fr) 2012-10-10
EP2508672B1 true EP2508672B1 (fr) 2015-03-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120002280 Active EP2508672B1 (fr) 2011-04-08 2012-03-29 Dispositif destiné au transfert d'un bande dans une station d'une machine de fabrication de bandes ou de traitement

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EP (1) EP2508672B1 (fr)
DE (1) DE102011016587A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016221156A1 (de) 2015-11-06 2017-05-11 Schaeffler Technologies AG & Co. KG Zweimassenschwungrad und Gleitlager für dieses
DE102024116649A1 (de) * 2024-06-13 2025-07-17 Voith Patent Gmbh Trockenzylinder für eine Maschine zur Herstellung einer Faserstoffbahn

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI62571C (fi) * 1980-12-01 1983-01-10 Valmet Oy Anordning vid flercylindertork i en pappersmaskin
DE3941242A1 (de) 1989-12-14 1991-06-20 Voith Gmbh J M Fuehrungsplatte zum einfaedeln einer bahn
US5337490A (en) * 1993-06-21 1994-08-16 Champion International Corporation Single tier dryer threading nozzle for paper machines
DE19548303B4 (de) 1995-12-22 2006-08-31 Voith Paper Patent Gmbh Trockenpartie
DE19726895A1 (de) * 1997-06-25 1999-01-07 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Materialbahn
DE10142519A1 (de) * 2001-08-30 2003-03-27 Voith Paper Patent Gmbh Ablöse- und Führungsvorrichtung

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Publication number Publication date
EP2508672A1 (fr) 2012-10-10
DE102011016587A1 (de) 2012-10-11

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