EP2147151B1 - Dispositif de guidage d'une bande de materiau - Google Patents

Dispositif de guidage d'une bande de materiau Download PDF

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Publication number
EP2147151B1
EP2147151B1 EP08749731A EP08749731A EP2147151B1 EP 2147151 B1 EP2147151 B1 EP 2147151B1 EP 08749731 A EP08749731 A EP 08749731A EP 08749731 A EP08749731 A EP 08749731A EP 2147151 B1 EP2147151 B1 EP 2147151B1
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EP
European Patent Office
Prior art keywords
vacuum chamber
running direction
suction
web strip
material web
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
EP08749731A
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German (de)
English (en)
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EP2147151A1 (fr
Inventor
Philippe Vom Bauer
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2147151A1 publication Critical patent/EP2147151A1/fr
Application granted granted Critical
Publication of EP2147151B1 publication Critical patent/EP2147151B1/fr
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/10—Advancing webs by a feed band against which web is held by fluid pressure, e.g. suction or air blast
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/52—Auxiliary process performed during handling process for starting
    • B65H2301/522—Threading web into machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/32—Suction belts
    • B65H2406/322—Suction distributing means
    • B65H2406/3221—Suction distributing means for variable distribution in the direction of transport
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/84—Paper-making machines

Definitions

  • the invention relates to a device for guiding a material web strip in a running direction with a housing in which a vacuum generating device is arranged, wherein in the housing in the direction of succession a plurality of vacuum chambers are arranged, each of which has at least one suction device.
  • a paper web must be guided through various processing devices during its production and processing, including a dryer section, a press section, a calender and optionally a spreading or a sizing device. For this purpose, one goes in many cases so that one cuts a web strip with a width in the order of 200 to 300 mm at the edge of the paper web and this strip first passes through the processing facility. Once this strip of material has come so far that you can exercise a train on him, the paper web is cut to width, so that they can go through the corresponding processing facility in full width.
  • devices which operate under reduced pressure are also used.
  • an air-permeable belt usually runs around a housing on which the material web lies. The tape is supported on a plate provided with holes or slots. On the side facing away from the tape of the plate, a negative pressure is generated, so that the web strip is sucked on the other side of the tape.
  • EP 1 127 978 B1 An example of such a device is out EP 1 127 978 B1 known.
  • several turbines are arranged in the housing, which suck air through the tape to hold the web strip on the other side of the tape.
  • EP 1 342 844 A2 Another embodiment is made EP 1 342 844 A2 known.
  • several “doctor blades” are arranged in the housing, which ends shortly below the inside of the band and peel off the air layer located there, so to speak. This also creates a negative pressure on the outside of the belt, with which the web or at least her web strip can be firmly sucked.
  • the invention has for its object to guide a strip of material safely.
  • a first vacuum chamber in the running direction of the material web strip has a larger number of suction devices than a arranged in the running direction of the material web strip behind vacuum chamber.
  • the holding force which is composed of area times negative pressure, in many cases still too low to hold the web strip as a whole safely.
  • this unstable situation only lasts for a short time, because the web of material continues to run and then covers the next or next chambers in the running direction, so that the vacuum located there also acts on the web of material.
  • the holding force acting on the material web strip is thus constructed in sections.
  • a first vacuum chamber in the running direction of the material web strip has a larger number of suction devices than a vacuum chamber arranged behind it in the direction of travel of the material web strip. This makes it possible to generate a higher negative pressure in the first vacuum chamber, as long as the web of material web has not yet completely covered this vacuum chamber. Because of the plurality of suction devices namely more air is conveyed away, so that the web strip already with a high reliability on the screen or another air-permeable band is held when the first vacuum chamber is not completely closed. The highest negative pressure occurs when the first vacuum chamber is completely covered by the material web strip. After the web strip is stabilized in this way over the first vacuum chamber, a lower negative pressure is sufficient to transport the web to the end of the device. Since the vacuum chambers are gradually covered and then act with full negative pressure on the web strip, the holding force on the air-permeable belt at the end of the device is very large. Slippage of the material web strip is reduced or even prevented.
  • the suction devices are designed as suction nozzles.
  • Suction nozzles are easy to install. They are supplied with compressed air, so that even the energy required for sucking energy can be provided in a simple manner.
  • a boundary wall is filled with suction in the first vacuum chamber.
  • this wall for example the bottom of the vacuum chamber, is completely or at least almost completely covered with suction devices.
  • the suction devices are not only the openings through which the suction air is sucked out of the vacuum chamber, but also the elements surrounding the suction openings. By having one accordingly large number of suction devices provides, which are distributed over the boundary wall, the negative pressure can be generated so to speak flat.
  • the vacuum chambers preferably have a guide side along which the material web strip runs and a bottom opposite the guide side, the suction devices acting through the bottom.
  • This embodiment has the advantage that the contaminants are sucked towards the bottom and can then be removed by the suction devices. In the long term practically no dirt can accumulate in the vacuum chamber. This applies regardless of whether the device is operated so that the web strip is guided in the direction of gravity above or below it. It is important in this context that the air flow can be sucked so to speak straight from the dirt causing side in the opposite side.
  • the guide side and the bottom are parallel to each other.
  • the vacuum chambers thus have a constant height in the direction of travel. This simplifies the production.
  • the guide side and the bottom have a spacing in the range of 5 to 35 mm, in particular in the range of 10 to 20 mm.
  • the volume of the vacuum chamber on the one hand kept so small that you with an acceptable cost can generate a sufficient negative pressure relatively quickly.
  • the suction means are arranged symmetrically with respect to a central axis which is parallel to the running direction.
  • the negative pressure relative to the central axis can be generated symmetrically, which also contributes to a stabilization of the material web strip on the air-permeable belt. If one has only a suction device, such as a suction nozzle, in the vacuum chamber, then this suction nozzle is divided by the central axis. If you have two suction nozzles in the vacuum chamber, then these are arranged symmetrically on both sides of the central axis.
  • At least two adjacent vacuum chambers are separated by a partition, which at least partially encloses an angle to the direction of rotation, which is greater than 95 ° or less than 85 °.
  • the partition extends at least in sections at an angle ⁇ 90 ° to the direction.
  • the partition has two legs which are inclined in opposite directions to the running direction. Preferably, these two legs are inclined in the direction of travel. This in turn results in symmetrical conditions, which has a favorable effect on the stabilization of the material web strip.
  • the legs collide in a V-shape.
  • the partition thus has two substantially straight sections so that it is easy to manufacture. As soon as the material web strip passes over the top of the "V" with its beginning, it is also subjected to negative pressure by the following vacuum chamber.
  • the partition extends in the direction of both sides of the suction device.
  • the suction device is thus positioned relatively close behind the partition, so that the negative pressure can act relatively early on the web strip, so almost immediately if the web has been passed over the partition wall. This results in conditions after only a short time, through which the material web strip can be stably guided. If the partition is V-shaped, then the suction is, so to speak, in the gusset of the "V".
  • the housing preferably has an intermediate wall delimiting the vacuum chamber. This makes it possible to keep the volume of the vacuum chambers small. The smaller the volume, the faster the air in it can be sucked off and the negative pressure built up. The amount of negative pressure is thus not appreciably affected. So you do not have to suck the entire housing empty to create the negative pressure.
  • the intermediate wall is formed trough-shaped with inclined side walls.
  • the inclined sidewalls contribute to a reduction in volume. On the other hand, they also help to remove dirt particles or water, which penetrate into the vacuum chamber, to the suction devices out.
  • the side walls are inclined in the direction of gravity to the suction device. This also facilitates the removal of dirt.
  • a compressed air supply line for the suction nozzles between the housing and the intermediate wall is arranged.
  • This compressed air supply line is therefore in any case not visible within the device and does not bother. Also, the risk of it being damaged is reduced.
  • a vacuum chamber has a volume of a maximum of 2 l, in particular a maximum of 1 l.
  • a vacuum chamber has a volume of a maximum of 2 l, in particular a maximum of 1 l.
  • a small volume can be vacuumed relatively quickly, so that even high-speed material web strips, for example, have a speed in the order of 1,800 m / min, can be kept stable very quickly.
  • At least one vacuum chamber is divided into at least two compartments parallel to the running direction. This is preferably the first vacuum chamber in the direction of travel. If the web strip is cut from the web, then it may happen that it does not come to lie exactly in the middle of the vacuum chamber. In this case, there is a risk that it does not completely cover the vacuum chamber, so that side air can still be sucked in, whereby the holding force is reduced. If you divide the vacuum chamber parallel to the running direction in at least two compartments, then the chance is great that at least one of these compartments is completely covered by the material web strip. At least in this compartment of the web strip is then held with full force.
  • each compartment is delimited in the direction of travel by a V-shaped partition. This results in the advantages that have been described above in connection with a vacuum chamber in general.
  • the V-shaped partition does not create a dead zone when the web of material passes over the partition. Rather, it is when crossing the partition then acted upon by the negative pressure in two adjacent compartments in the direction.
  • a device 1 for guiding a material web strip not shown in a running direction 2 has a housing 3, which is provided at its front end with a guide roller 4 and at its rear end with a guide roller 5.
  • a drive pin 6 is provided, to which a drive motor not shown in detail can be connected.
  • an air-permeable belt is performed, which is not shown for reasons of clarity in the drawing.
  • This band may be formed, for example, as a sieve.
  • the housing 3 has a cover plate, also not shown, which is provided with openings, for example in the form of slots.
  • the cover plate has been omitted in order to be able to present details of the interior of the device 1.
  • the air-permeable tape lies on the cover plate. On the tape then lies the web of material that is acted upon by the cover plate and the air-permeable belt with negative pressure and thus sucked on the outside of the air-permeable belt.
  • Each partition wall 13-17 has in plan view a V-shape, that is, two legs 18, 19, which extend at an angle of approximately 45 ° to the running direction 2.
  • Each vacuum chamber 7-12 is provided with at least one suction device in the form of a suction nozzle 20a-20e, 21-25.
  • the first suction chamber 7 in the running direction 2 has a larger number of suction nozzles 20a-20e than the vacuum chambers 8-12 located further back in the running direction 2.
  • the first vacuum chamber 7 has five suction nozzles 20a-20e. But it is also possible to provide the first vacuum chamber 7 only with three or four suction nozzles.
  • the suction nozzles 20-25 are arranged in a bottom 26 of the vacuum chamber 7-12.
  • the floor 26 is a boundary wall, which is opposite a guide side 27, along which the material web strip is guided.
  • On the guide side 27 is the air-permeable belt on which the web strip is applied (not shown).
  • the bottom 26 and the guide side 27 are parallel to each other with a distance in the range of 5 to 35 mm, preferably with a distance in the range of 10 to 20 mm.
  • the suction nozzles 20a-20e are arranged in the first vacuum chamber 7 in the running direction 2 so that they fill the bottom 26. So there would be no room for another suction nozzle 20a-20e. This makes it possible not only relatively quickly build a negative pressure in the first vacuum chamber 7 when the web of material is passed over the vacuum chamber 7, but to let the negative pressure already act on the web strip to a sufficient extent, if the web of material web vacuum chamber. 7 not finished yet.
  • the respective suction nozzle 21-25 is arranged so that it is relatively close to the partition wall 13-17 so that it is still surmounted in the direction 2 on both sides of the respective partition wall 13-17.
  • the suction nozzle 21-25 is located, so to speak, in the "gusset" of the "V".
  • the housing 3 has an intermediate wall 28 which limits the vacuum chambers 7-12.
  • the intermediate wall 28 has two inclined side walls 29, 30 which are inclined in the direction of the suction nozzles 20-25.
  • Fig. 4 schematically shows a suction nozzle 23 in section.
  • the suction nozzle 23 has a compressed air inlet 31 through which compressed air can be injected.
  • the suction nozzle 23 also has a suction inlet 32.
  • the compressed air entering through the compressed air inlet 31 passes through a gap between the differently hatched parts of the suction nozzle 23 and then flows out through an outlet 33. It tears suction air, which has entered through the suction inlet 32, with.
  • the suction nozzle 23 operates on the venturi principle.
  • each vacuum chamber 7-12 has a volume of approximately 2 l or less, for example 1 l.
  • a compressed air supply line 34 is arranged in the housing 3 and between the intermediate wall 28 and the actual housing wall, so that the compressed air supply line 34 does not interfere to the outside in appearance.
  • the compressed air supply line 34 is connected in each case via a branch line 35 with the respective suction nozzles 20-25.
  • a vacuum chamber 7-12 has a length in the direction of 2 of about 300 mm. At a web speed of 1,800 m / min, it takes about 1/100 second until a vacuum chamber 7-12 is covered by the web strip. Depending on the setting, a suction nozzle has a suction power of, for example, 4,500 l / min, so that about 1/5 second of approximately 0,75 l of air can be sucked out of each vacuum chamber 7-12. If the vacuum chamber 7-12 has a volume of 1 to 2 l, then the web strip is reliably held, as soon as it has run over a vacuum chamber 7-12. In order to build up the necessary negative pressure, it is not necessary to remove all the air from the vacuum chamber 7-12.
  • the partitions 13-17 have the illustrated V-shape (other shapes are also possible, as long as they do not run at right angles to the running direction 2), the web of material web is simultaneously acted upon by a negative pressure in two adjacent vacuum chambers 7-12 when conveyed in running direction 2, as soon as he starts to cross a partition 13-17. This avoids dead zones. It is also helpful that the suction nozzles 21-25 are arranged relatively close behind the partitions 13-17, so that the negative pressure generated thereby can also act relatively quickly on the web strip.
  • the suction nozzles 20-25 practically open at the level of the floor 26. In any case, they are arranged so that air is sucked through the floor. This has a significant advantage for the self-cleaning effect of the device. When fibers, dust or water accumulate in the vacuum chambers 7-12, these contaminants are sucked by the suction nozzles 20-25 and blown out on the bottom of the device 1.
  • a zone i. a vacuum chamber 7-12 has a length of the order of 250 to 400 mm.
  • a vacuum chamber 7-12 has a length of the order of 250 to 400 mm.
  • the first negative pressure chamber 7 in the running direction 2 for example, it is possible to generate a negative pressure of 28 mbar.
  • a negative pressure of 5 to 20 mbar is sufficient.
  • the suction nozzles 20-25 are arranged symmetrically with respect to a central axis 36. Thus, if a vacuum chamber 8-12 has only one suction nozzle 21-25, then this suction nozzle 21-25 is divided by the central axis 36. If, as in the first vacuum chamber 7, a plurality of suction nozzles 20a-20e are provided, then they are symmetrical arranged to the central axis 36. As a result, pressure conditions can be realized in the vacuum chambers 7-12, which are also symmetrical to the central axis 36. A displacement of the material web strip by different pressures is virtually ruled out.
  • each compartment is provided with its own suction nozzle 20-25, wherein the first direction in the first compartment of each row in turn more suction nozzles than the downstream in the direction of the compartments.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Advancing Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Replacement Of Web Rolls (AREA)
  • Chutes (AREA)

Claims (18)

  1. Dispositif pour guider une bande d'une nappe de matériau dans une direction d'avance avec un boîtier, dans lequel est disposé un dispositif générateur de dépression, plusieurs chambres de dépression (7-12) étant disposées les unes derrière les autres dans la direction d'avance (2) dans le boîtier (3), dont chacune présente au moins un dispositif d'aspiration (20-25), caractérisé en ce qu'une première chambre de dépression (7) dans la direction d'avance (2) de la bande de nappe de matériau présente un nombre de dispositifs d'aspiration (20a-20e) supérieur à une chambre de dépression (8-12) disposé derrière elle dans la direction d'avance (2) de la bande de nappe de matériau.
  2. Dispositif selon la revendication 1, caractérisé en ce que les dispositifs d'aspiration sont réalisés sous forme de buses d'aspiration (20-25).
  3. Dispositif selon la revendication 2, caractérisé en ce que l'on remplit dans la première chambre de dépression (7) une paroi de limitation avec des dispositifs d'aspiration (20a-20e).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les chambres de dépression (7-12) présentent un côté de guidage (27), le long duquel s'étend la bande de nappe de matériau, et un fond (26) opposé au côté de guidage (27), les dispositifs d'aspiration (20-25) agissant à travers le fond (26).
  5. Dispositif selon la revendication 4, caractérisé en ce que le côté de guidage (27) et le fond (26) s'étendent parallèlement l'un à l'autre.
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que le côté de guidage (27) et le fond (26) sont espacés d'une distance de l'ordre de 5 à 35 mm, notamment de l'ordre de 10 à 20 mm.
  7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les dispositifs d'aspiration (20-25) sont symétriques par rapport à un axe médian (36) qui s'étend parallèlement à la direction d'avance (2).
  8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'au moins deux chambres de dépression (7-12) adjacentes sont séparées l'une de l'autre par une paroi de séparation (13-17), qui forme au moins en partie un angle avec la direction d'avance (2) qui est supérieur à 95° ou inférieur à 85°.
  9. Dispositif selon la revendication 8, caractérisé en ce que la paroi de séparation (13-17) présente deux branches (18, 19) qui sont inclinées dans des directions opposées par rapport à la direction d'avance (2).
  10. Dispositif selon la revendication 9, caractérisé en ce que les branches (18, 19) se rejoignent en formant un V.
  11. Dispositif selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'au moins dans le cas d'une chambre de dépression (8-12), la paroi de séparation (13-17) s'étend dans la direction d'avance de chaque côté du dispositif d'aspiration (21-25).
  12. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le boîtier (3) présente une paroi intermédiaire (28) limitant les chambres de dépression (7-12).
  13. Dispositif selon la revendication 12, caractérisé en ce que la paroi intermédiaire (28) est réalisée en forme de cuvette avec des parois latérales inclinées (29, 30).
  14. Dispositif selon la revendication 13, caractérisé en ce que les parois latérales (29, 30) sont inclinées dans la direction de la force de pesanteur vers le dispositif d'aspiration (20-25).
  15. Dispositif selon l'une quelconque des revendications 12 à 14, caractérisé en ce qu'une conduite d'alimentation en air comprimé (34, 35) pour les buses d'aspiration (20-25) est disposée entre le boîtier (3) et la paroi intermédiaire (28).
  16. Dispositif selon l'une quelconque des revendications 1 à 15, caractérisé en ce qu'une chambre de dépression (7-12) présente un volume de 2 l au maximum, notamment de 1 l au maximum.
  17. Dispositif selon l'une quelconque des revendications 1 à 16, caractérisé en ce qu'au moins une chambre de dépression (7-12) est divisée en au moins deux sections parallèlement à la direction d'avance (2).
  18. Dispositif selon la revendication 17, caractérisé en ce que chaque section est limitée dans la direction d'avance (2) par une paroi de séparation en forme de V.
EP08749731A 2007-05-18 2008-04-25 Dispositif de guidage d'une bande de materiau Active EP2147151B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007023215A DE102007023215A1 (de) 2007-05-18 2007-05-18 Vorrichtung zum Führen eines Materialbahnstreifens
PCT/EP2008/055069 WO2008141890A1 (fr) 2007-05-18 2008-04-25 Dispositif de guidage d'une bande de matière

Publications (2)

Publication Number Publication Date
EP2147151A1 EP2147151A1 (fr) 2010-01-27
EP2147151B1 true EP2147151B1 (fr) 2010-08-18

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Application Number Title Priority Date Filing Date
EP08749731A Active EP2147151B1 (fr) 2007-05-18 2008-04-25 Dispositif de guidage d'une bande de materiau

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EP (1) EP2147151B1 (fr)
AT (1) ATE478194T1 (fr)
CA (1) CA2687551C (fr)
DE (2) DE102007023215A1 (fr)
WO (1) WO2008141890A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009001743A1 (de) 2009-03-23 2010-09-30 Voith Patent Gmbh Vorrichtung zum Führen eines Materialbahnstreifens

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI112267B (fi) 1998-09-29 2003-11-14 Metso Paper Inc Laite paperikoneessa rainan päänvientinauhan kuljetuksessa ja ohjauksessa
ATE315125T1 (de) 2000-02-26 2006-02-15 Voith Paper Patent Gmbh Unterdruck-bandförderer
DE202006018216U1 (de) * 2005-11-30 2007-02-22 Andritz Küsters GmbH & Co. KG Unterdruck-Bandfördervorrichtung zum Führen einer laufenden Bahn

Also Published As

Publication number Publication date
ATE478194T1 (de) 2010-09-15
CA2687551C (fr) 2015-11-17
DE502008001169D1 (de) 2010-09-30
CA2687551A1 (fr) 2008-11-27
DE102007023215A1 (de) 2008-11-20
WO2008141890A1 (fr) 2008-11-27
EP2147151A1 (fr) 2010-01-27

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