EP2233418A2 - Dispositif destiné à la commande d'une bande de matériau - Google Patents

Dispositif destiné à la commande d'une bande de matériau Download PDF

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Publication number
EP2233418A2
EP2233418A2 EP10154319A EP10154319A EP2233418A2 EP 2233418 A2 EP2233418 A2 EP 2233418A2 EP 10154319 A EP10154319 A EP 10154319A EP 10154319 A EP10154319 A EP 10154319A EP 2233418 A2 EP2233418 A2 EP 2233418A2
Authority
EP
European Patent Office
Prior art keywords
suction
vacuum chamber
running direction
web strip
vacuum
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.)
Granted
Application number
EP10154319A
Other languages
German (de)
English (en)
Other versions
EP2233418A3 (fr
EP2233418B1 (fr
Inventor
Wolfgang Drefs
Daniel Kather
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 EP2233418A2 publication Critical patent/EP2233418A2/fr
Publication of EP2233418A3 publication Critical patent/EP2233418A3/fr
Application granted granted Critical
Publication of EP2233418B1 publication Critical patent/EP2233418B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/32—Suction belts
    • 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 with a circulating around deflection rollers air-permeable belt and a housing in which a plurality of vacuum chambers are arranged one behind the other in the running direction, 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. In many cases, this is done by cutting a strip of material web having a width of the order of 100 to 300 mm at the edge of the paper web and first guiding this strip through the processing device. Once this strip of material has come so far that you can exercise a train on him in the next processing station, the paper web is cut to width, so that they can pass through the corresponding processing facility in full width.
  • 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.
  • 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.
  • blowing nozzles It is particularly difficult to take over the beginning of the material web strip from a delivery surface, which may be a drying cylinder surface, for example, on the tape.
  • a delivery surface which may be a drying cylinder surface, for example, on the tape.
  • blowing nozzles is very complex and the vacuum chambers act only in the direction behind the guide roller through the belt.
  • the deflection roller of the belt in the vicinity of which the beginning of the material web strip should run onto transfer belt, be aspirated.
  • Exemplary in this context is the EP 1440926 B1 called. It is easy to see that the production cost of such an absorbable deflection roller is very large.
  • the invention has for its object to make a web strip easier from a delivery surface to the receiving position on the tape feasible.
  • the first vacuum chamber in the running direction extends to a part in the Auslaufzwickel between a guide roller and the circulating belt and at least one suction device of the first vacuum chamber is inclined with its suction towards the direction, wherein the suction direction is set approximately tangentially to the circumference of the guide roller.
  • the suction effect of the device extends significantly further in the direction of the discharge surface of the material web strip.
  • a web of material from a drying cylinder from which it runs for a while in the pulper of the paper machine
  • a small blast of air from a laterally disposed air nozzle to the web strip in the detection area to bring the first suction zone.
  • the first suction chamber is bring with the inventive design of the device very close to the delivery surface of the material web strip.
  • the suction device can develop its suction effect, as it were, across the inlet-side deflection roller. This is not achieved only by the inclination of the suction device (which incidentally already in DE 20 2006 018 215 U1 , Figure 8 is indicated), but only in combination with the fact that the first vacuum chamber in the running direction extends to a part in the Auslaufzwickel between a guide roller and the circulating belt.
  • a fictitious Saugiquessline can therefore tangentially - and optionally deflected against the direction of rotation of the suction - continue past the first guide roller through the perforation of the tape in the direction of discharge surface for the web strip.
  • the suction device detects the web strip much earlier than in devices in the state the technology, apart from the elaborate vacuum transfer belts, the guide rollers are already sucked. It is irrelevant if, in addition, a thin separating plate, which is arranged very close to the deflection roller and possibly assumes its curvature, is present in the outlet gusset, as it reduces the suction space only insignificantly.
  • the length of the first vacuum zone is preferably relatively short and limited to less than 80 mm.
  • 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.
  • 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.
  • particularly suitable nozzles that operate on the venturi principle.
  • this is ensured if the air velocity at the inlet in the outlet gusset is still greater than 12 m / s above the strip during the intake process. With such a large suction speed, it is ensured that the material web strip is grasped securely and can be deposited on the belt. In many cases, especially in light paper grades, not even an additional separating element for the transverse cutting of the material web strip is more necessary.
  • 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 run can accumulate practically no dirt 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 suction devices of the vacuum chamber following the first vacuum chamber in the running direction are likewise inclined towards the running direction. And here it is particularly preferred if the inclination angle decreases in the direction of vacuum chamber to vacuum chamber.
  • the suction direction which is still clearly aligned with the first vacuum chamber in the direction of discharge surface, moves from vacuum chamber to vacuum chamber in the direction perpendicular to the belt. A structure of such a vacuum chamber is easier to accomplish.
  • the suction devices are arranged symmetrically with respect to a central axis which runs 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.
  • 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 direction. This also facilitates the removal of dirt.
  • a compressed air supply line for the suction device 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 at most 2 l, in particular at most 1 l.
  • a small volume can be sucked up 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.
  • the device preferably has two deflection rollers for the delivery surface of the material web strip.
  • the diameter of at least one guide roller is less than 60 mm. Such a diameter makes it possible to bring the first suction zone very close to the discharge surface of the material web strip.
  • a device 1 for guiding a material web strip in a running direction 2 comprises a housing 3, which is provided at its front end with two pulleys 4.1 and 4.2 and at its rear end in a manner not shown with a deflection roller.
  • a drive pin 6 ( Fig. 3 ), to which a non-illustrated drive motor can be connected.
  • This band 17 may be formed, for example, as a sieve.
  • the housing 3 has a cover plate 18 which is provided with openings, for example in the form of slots.
  • the air-permeable belt 17 rests on the cover plate 18.
  • the web strip 11 which is acted upon by the cover plate 18 and the air-permeable belt 17 with negative pressure and thus firmly sucked on the outside of the air-permeable belt 17.
  • the web strip 11 is removed from a delivery surface 19.
  • This delivery surface is in the embodiment of Fig. 1 formed by the surface of a drying cylinder 22. From there, the material web strip (dash-dotted line) runs for a while in the pulper 21 until it is sucked in and taken over by the device 1 and forwarded according to reference numeral 11.
  • Fig. 1 shows in section of the housing 3 four vacuum chambers 7-10.
  • the vacuum chambers are separated by partitions 13-15.
  • Each vacuum chamber 7-10 is provided with at least one suction device 23 in the form of a suction nozzle 20a-20d. At least in the direction of 2 first suction chamber 7 in this case has a suction nozzle 20a, which is tilted counter to the direction 2. The suction direction runs tangentially to the guide roller 4.1. In this case, the first vacuum chamber 7 is separated only by a closely adjacent to the guide roller plate 16 thereof. The first vacuum chamber 7 thus also extends into the outlet gusset 12 between guide roller 4.1 and belt.
  • Fig. 1 does not show again that in each vacuum chamber 7-10 and a plurality of suction nozzles 20a-20d side by side, so can be arranged perpendicular to the direction 2. This depends on the width of the device. Often it is favorable, at least in the first vacuum chamber 7 to accommodate a plurality of suction nozzles 20a to increase the suction power.
  • the suction nozzles 20a-20d are arranged in a bottom 26 of the vacuum chambers 7-10.
  • the bottom 26 is a boundary wall, which is opposite to a guide side 27, on which the web strip is guided along.
  • On the guide side 27 is the air-permeable belt on which the web of material lies.
  • the bottom 26 and the guide side 27 can be 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 parallelism of the bottom 26 to the guide side 27 is particularly in the region of the vacuum chamber 10 in Fig. 1 recognizable.
  • Fig. 2 schematically shows a suction device 23 in section.
  • the suction device 23 in the form of a nozzle has a compressed air inlet 31 through which compressed air can be injected.
  • the suction device 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 and then flows out through an outlet 33. It tears suction air, which has entered through the suction inlet 32, with.
  • the suction nozzle works on the venturi principle.
  • the housing 3 has an intermediate wall 28 which limits the vacuum chambers 7-10.
  • the intermediate wall 28 has two inclined side walls 29, 30, which are inclined in the direction of the suction nozzles 20a-20d.
  • each vacuum chamber 7-10 has a volume of about 2 l or less, for example 1 l.
  • a compressed air supply line 34 is arranged in the housing 3 between the intermediate wall 28 and the actual housing wall, so that the compressed air supply line 34 does not interfere to the outside.
  • the Compressed air supply line 34 is connected in each case via a branch line 35 with the respective suction nozzles 20a-20d.
  • the first nozzle in the running direction has a maximum length also in the direction of 2 of 80 mm.
  • a following vacuum chamber 8-10 has a length in the direction of 2 from 80 to 300 mm.
  • a suction nozzle has a suction power of, for example, 4,500 l / min, so that about 1/75 second of approximately 0,75 l of air can be sucked out of each vacuum chamber 7-10. If the vacuum chamber 7-10 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 7-10.
  • the suction devices 23 open practically at the level of the bottom 26. In any case, they are arranged so that air is sucked through the ground. This has a significant advantage for the self-cleaning effect of the device. When fibers, dust or water accumulate in the vacuum chambers 7-10, these contaminants are sucked by the suction nozzles 20a-20d and blown out on the bottom of the device 1.
  • the suction nozzles 20a-20d are arranged symmetrically with respect to a central axis. Thus, if a vacuum chamber 8-10 has only one suction nozzle 20a-20d, then this suction nozzle is divided by the central axis 36. If, as in the first vacuum chamber 7, a plurality of suction nozzles 20a are provided, then these are arranged symmetrically to the central axis. As a result, pressure conditions can be realized in the vacuum chambers 7-10, which are also symmetrical to the central axis are. A displacement of the material web strip by different pressures is virtually ruled out.
  • each compartment is provided with its own suction nozzle 20a-20d.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Advancing Webs (AREA)
EP20100154319 2009-03-23 2010-02-23 Dispositif destiné à guider une bande de matériau Active EP2233418B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910001743 DE102009001743A1 (de) 2009-03-23 2009-03-23 Vorrichtung zum Führen eines Materialbahnstreifens

Publications (3)

Publication Number Publication Date
EP2233418A2 true EP2233418A2 (fr) 2010-09-29
EP2233418A3 EP2233418A3 (fr) 2011-03-16
EP2233418B1 EP2233418B1 (fr) 2012-09-19

Family

ID=42289526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100154319 Active EP2233418B1 (fr) 2009-03-23 2010-02-23 Dispositif destiné à guider une bande de matériau

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EP (1) EP2233418B1 (fr)
DE (1) DE102009001743A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3092191A4 (fr) * 2014-01-09 2017-10-04 Valmet Aktiebolag Enrouleuse pour recevoir et enrouler sous la forme d'un rouleau une bande de papier qui arrive à partir d'un cylindre de séchage dans une machine à papier, et machine à papier utilisant une enrouleuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254666A1 (fr) * 1986-07-18 1988-01-27 Beloit Corporation Dispositif pour le transfert d'une bande à une section de séchage
DE20019346U1 (de) * 2000-11-14 2001-02-22 Voith Paper Patent Gmbh Vacuum-Bandfördervorrichtung
WO2001040573A1 (fr) * 1999-12-02 2001-06-07 Metso Paper, Inc Procede de soutien d'une bande et dispositif support a cet effet
DE102007023215A1 (de) * 2007-05-18 2008-11-20 Voith Patent Gmbh Vorrichtung zum Führen eines Materialbahnstreifens

Family Cites Families (4)

* 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
EP1440926B1 (fr) 2000-11-14 2007-09-26 Voith Patent GmbH Transporteur a courroie aspirante et machine comportant un tel convoyeur pour la fabrication ou la finition d'une bande de papier
DE202006018215U1 (de) 2005-11-30 2007-02-08 Andritz Küsters GmbH & Co. KG Unterdruck-Bandfördervorrichtung zum Führen einer laufenden Bahn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254666A1 (fr) * 1986-07-18 1988-01-27 Beloit Corporation Dispositif pour le transfert d'une bande à une section de séchage
WO2001040573A1 (fr) * 1999-12-02 2001-06-07 Metso Paper, Inc Procede de soutien d'une bande et dispositif support a cet effet
DE20019346U1 (de) * 2000-11-14 2001-02-22 Voith Paper Patent Gmbh Vacuum-Bandfördervorrichtung
DE102007023215A1 (de) * 2007-05-18 2008-11-20 Voith Patent Gmbh Vorrichtung zum Führen eines Materialbahnstreifens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3092191A4 (fr) * 2014-01-09 2017-10-04 Valmet Aktiebolag Enrouleuse pour recevoir et enrouler sous la forme d'un rouleau une bande de papier qui arrive à partir d'un cylindre de séchage dans une machine à papier, et machine à papier utilisant une enrouleuse
US9828201B2 (en) 2014-01-09 2017-11-28 Valmet Aktiebolag Reel-up for receiving and winding into a roll a paper web that arrives from a drying cylinder in a paper making machine and a paper making machine using a reel-up

Also Published As

Publication number Publication date
EP2233418A3 (fr) 2011-03-16
DE102009001743A1 (de) 2010-09-30
EP2233418B1 (fr) 2012-09-19

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