EP2508672B1 - Device for transferring a web in a station of a web production or processing machine - Google Patents
Device for transferring a web in a station of a web production or processing machine Download PDFInfo
- 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
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- 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.)
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- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000012545 processing Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000002517 constrictor effect Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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.
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- Drying Of Solid Materials (AREA)
- Advancing Webs (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zum Überführen einer Bahn in einer Station einer Bahn-Herstellungs- oder Verarbeitungsmaschine nach dem Oberbegriff des Anspruchs 1.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
Zum Einfädeln einer Papierbahn in einer Papiermaschine wird gewöhnlich zunächst ein schmaler Streifen der Bahn überführt. Zur Überführung dieses Streifens werden unterschiedliche Aggregate eingesetzt. In Trockengruppen werden zur Überführung beispielsweise so genannte Blasschaber eingesetzt. Diese bestehen im Wesentlichen aus zwei oder mehreren Düsenanordnungen. Dabei ist gewöhnlich eine Düse gegen die laufende Papierbahn gerichtet, um den Aufführstreifen von einem Zylinder abzuheben und einer weiteren Düsenanordnung, um den Aufführstreifen mit Hilfe einer Luftströmung in Papierlaufrichtung weiter zu fördern.For threading a paper web in a paper machine, 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.
Aus
Aus
Bei hohen Bahngeschwindigkeiten wirken die Stege zwischen den Nuten wie eine Sprungschanze und führen den Bahnstreifen vom Schaber weg. Dies hat schwerwiegende Nachteile. Zum einen kann es zur Bildung eines sogenannten Doppelstreifens kommen. In diesem Fall wird der Bahnstreifen erst später von den Förderdüsen erfasst, während die Streifenspitze bereits durch die Maschine vagabundiert. Zum anderen muss die Richtungsumkehr auch während der Förderung wieder von den Luftdüsen ausgeglichen werden, was zu einem Wirkungsgradverlust führt. Bei einer Richtungsumkehr werden Fliehkräfte wirksam, die mit höherem Bahngewicht und höherer Bahngeschwindigkeit anwachsen und ausgeglichen werden müssen. Nachteilig sind insoweit auch die mit der Stärke der Luftströmung stärker werdenden Turbulenzen.At high web speeds, the webs between the grooves act like a ski jump and lead the web strip away from the scraper. This has serious disadvantages. On the one hand, it can lead to the formation of a so-called double stripe. In this case, the web strip is detected later by the delivery nozzles, while the strip tip already strays through the machine. On the other hand, the direction reversal must be compensated again during the promotion of the air nozzles, resulting in a loss of efficiency. When the direction is reversed, 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.
Aus
Die Richtwirkung und der Wirkungsgrad von Lochdüsen sind dagegen im Prinzip sehr hoch, solange eine solche Lochdüse singulär eingesetzt wird. Möchte man aber mehrere Lochdüsen nebeneinander einsetzen, dann führt dies zu dem Problem, dass zwischen den Einzelstrahlen und sehr stark im Bereich des Strahlaustritts ein Unterdruck erzeugt wird. Die einzelnen Luftstrahlen ziehen sich daher gegenseitig an. Da jeder Strahl zwei Nachbarn hat, hängt es nur von Kleinigkeiten ab, welche Luftstrahlen sich zuerst zu einem Luftteppich verbinden. Die Bildung des Luftteppichs ist deshalb sehr instabil. Ein gleichmäßiger Luftteppich kann dadurch nicht gebildet werden. Durch das chaotische Verhalten entstehen im Luftteppich unterschiedliche Bereiche, in denen Wirbel auftreten, und der Wirkungsgrad ist deutlich reduziert.The directivity and the efficiency of hole nozzles, however, are in principle very high, as long as such a hole nozzle is used singularly. But if you want to use several hole nozzles side by side, then this leads to the problem that between the individual jets and very much in the beam exit a negative pressure is generated. The individual air jets therefore attract each other. Since each jet has two neighbors, it depends only on trifles, which air jets first connect to an air carpet. The formation of the air carpet is therefore very unstable. A uniform air carpet can not be formed. Due to the chaotic behavior different areas are created in the air carpet, in which vortexes occur, and the efficiency is significantly reduced.
Aufgabe der Erfindung ist es daher, eine Vorrichtung zum Überführen einer Bahn in einer Station einer Bahn-Herstellungs- oder Verarbeitungsmaschine zu schaffen, die einfach aufgebaut ist und einen verbesserten Wirkungsgrad besitzt.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.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of
Hierdurch wird eine Vorrichtung zum Überführen der Bahn geschaffen, die das Verhalten der Einzelstrahlen einer Düsenreihe zur Ausbildung eines Luftteppichs verbessert. Die Verbindung der Einzelströmungen zu einer Gesamtströmung, d.h. zu einem Luftteppich, wird dadurch verbessert, dass die Strömungsfelder der Einzelströmungen mindestens teilweise unterschiedlich gerichtet sind. Anstelle einer totalen Ordnung der Anordnung der Einzeldüsen, d.h. in gleichen Abständen und parallel zueinander, wird eine bestimmte Unordnung durch eine vorgebbare Zuordnung eingestellt. Dadurch wird es nicht mehr mehr oder weniger dem Zufall überlassen, mit welcher Nachbarströmung die erste Verbindung eingegangen wird, sondern die Düsen werden so angeordnet, dass eine Verbindungsreihenfolge klar vorgegeben wird.As a result, a device for transferring the web is provided, 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. Instead of a total order of the arrangement of the individual nozzles, ie at equal intervals and parallel to each other, 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.
Anstelle einer unklaren, instabilen Situation, die ein Chaos in Form von Turbulenzen und Wirbelbildung im Luftteppich ausprägt, wird eine klare Zuordnung geschaffen.Instead of an unclear, unstable situation, which creates a chaos in the form of turbulence and vortex formation in the air carpet, a clear classification is created.
Dies kann auf unterschiedliche Weise erreicht werden. Die Düsenröhrchen haben beispielsweise einen paarweisen unterschiedlichen Bohrungsabstand, sind paarweise nicht parallel zueinander angeordnet. Alternativ ist auch eine Kombination der beiden Prinzipien einstellbar.This can be achieved in different ways. The nozzle tubes, for example, have a pair of different hole spacing, are not arranged in pairs parallel to each other. Alternatively, a combination of the two principles is adjustable.
Es ist außerdem vorteilhaft, die jeweils äußeren Düsenröhrchen winkelig anzuordnen, so dass sie vom Strahlenzentrum weg zeigen. Dadurch wird einem Einschnüreffekt entgegengewirkt und die nutzbare Düsenbreite vergrößert.It is also advantageous to arrange the respective outer nozzle tubes at an angle, so that they point away from the radiation center. As a result, a constricting effect is counteracted and the usable nozzle width is increased.
Vorzugsweise sind die Düsenröhrchen der zweiten Düseneinrichtung unterhalb eines Deckblechs angeordnet. Der Papier- bzw. Randstreifen ist dadurch vor dem direkten Kontakt mit den Düsen geschützt. Zur Bildung eines zusätzlichen Luftteppichs auf diesem Deckblech ist vorzugsweise eine weitere Düsenreihe vorgesehen, die anfangsseitig der Oberfläche des Deckblechs vorgesehen ist. Diese weiteren Düsen sind vorzugsweise als Coanda-Düsen ausgeführt. Die Düsen der weiteren Düsenreihe können Loch- oder Schlitzdüsen sein. Die Coanda-Bauform hat hier den Vorteil, dass aus den Einzelstrahlen sehr schnell ein gleichmäßiger Luftteppich wird. Die Luftströmung muss nicht besonders stark sein, denn sie verfolgt nicht den Zweck, den Papierstreifen über eine weite Entfernung zu fördern. Dazu ist die zweite Düseneinrichtung vorgesehen.Preferably, 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. To form an additional air carpet on this cover plate, 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. For this purpose, the second nozzle device is provided.
Der Luftteppich an der Oberseite des Deckblechs und die Freistrahlzone an der Unterseite des Deckblechs verbinden sich am Ende des Deckblechs. Hierdurch wird die Gefahr eines Abreißens des Luftteppichs am Ende der Luftleiteinrichtung beseitigt. Die anströmende Luft an der Oberseite des Deckblechs eliminiert ferner die Unterdruckbereiche zwischen den Strömungen der Freistrahldüsen. Dies führt zu einer wesentlichen Beruhigung der Strömung. Die Wirbelbildung wird deutlich reduziert. Die Düsenbohrungen der Coanda-Düsen sind dabei vorzugsweise zwischen den Einzeldüsen der zweiten Düseneinrichtung angeordnet.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. As a result, the risk of tearing of the air carpet at the end of the louver is eliminated. 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.
Weiterhin ist vorteilhaft, dass dann durch eine Ansaugung des Papierstreifens an der Oberfläche des Deckbleches der Papierstreifen optimal an die Freistrahlströmung geführt und gleichsam in die Strömung der zweiten Düseneinrichtung gelegt wird. Die Kraftübertragung ist dadurch deutlich besser.Furthermore, it is advantageous that then by a suction of the paper strip on the surface of the cover plate of the paper strip is optimally guided to the free jet flow and as it is placed in the flow of the second nozzle device. The power transmission is significantly better.
Die erfindungsgemäße Vorrichtung ist schließlich auch robust und wartungsarm. Der Verbrauch an Treibmittel ist gegenüber bekannten Vorrichtungen erheblich reduziert.Finally, the device according to the invention is also robust and requires little maintenance. The consumption of propellant is considerably reduced compared to known devices.
Weitere Ausgestaltungen und Vorteile der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments and advantages of the invention will become apparent from the following description and the dependent claims.
Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.
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Fig. 1 zeigt schematisch eine Seitenansicht einer Bahn-Herstellungsmaschine mit einer mit erfindungsgemäßen Vorrichtungen zum Überführen einer Bahn ausgestatteten Trockenpartie, -
Fig. 2 zeigt schematisch eine perspektivische Teilansicht der Trockenpartie gemäßFig. 1 , -
Fig. 3a zeigt den Ausschnitt X inFig. 1 vergrößert und teilweise geschnitten unter Darstellung eines ersten Ausführungsbeispiels der Vorrichtung zum Überführen einer Bahn, -
Fig. 3b zeigt teilweise geschnitten ein zweites Ausführungsbeispiel der Vorrichtung zum Überführen einer Bahn, -
Fig. 3c zeigt teilweise geschnitten ein drittes Ausführungsbeispiel der Vorrichtung zum Überführen einer Bahn, -
Fig. 4 zeigt schematisch eine Draufsicht der Vorrichtung zum Überführen einer Bahn gemäß dem ersten Ausführungsbeispiel, -
Fig. 5 zeigt schematisch eine Vorderansicht der Vorrichtung zum Überführen einer Bahn gemäß dem ersten Ausführungsbeispiel, -
Fig. 6 zeigt schematisch eine perspektivische Seitenansicht der Vorrichtung zum Überführen einer Bahn gemäß dem ersten Ausführungsbeispiel, -
Fig. 7 zeigt schematisch eine Draufsicht gemäßFig. 4 mit Darstellung der zweiten Düseneinrichtung, -
Fig. 8a zeigt schematisch die Luftleiteinrichtung gemäßFig. 3a unter Darstellung der durch die zweite Düseneinrichtung erzeugten Strömung, -
Fig. 8b zeigt schematisch eine Luftleiteinrichtung mit einer Zuordnung der Düsenröhrchen der zweiten Düseneinrichtung gemäß einem vierten Ausführungsbeispiel, -
Fig. 8c zeigt schematisch eine Luftleiteinrichtung mit einer Zuordnung der Düsenröhrchen der zweiten Düseneinrichtung gemäß einem fünften Ausführungsbeispiel, -
Fig. 8d zeigt schematisch eine Luftleiteinrichtung mit einer Zuordnung der Düsenröhrchen der zweiten Düseneinrichtung gemäß einem sechsten Ausführungsbeispiel, -
Fig. 8e zeigt schematisch eine Luftleiteinrichtung mit einer Zuordnung der Düsenröhrchen der zweiten Düseneinrichtung gemäß einem siebten Ausführungsbeispiel, -
Fig. 9a und Fig. 9c bis Fig. 9e zeigen die denFig. 8a bis 8d zugeordnete Strömungsverbindung benachbarter Strömungsfelder.
-
Fig. 1 1 schematically shows a side view of a web-making machine with a dryer section equipped with apparatuses for transferring a web according to the invention, -
Fig. 2 schematically shows a partial perspective view of the dryer section according toFig. 1 . -
Fig. 3a shows the section X inFig. 1 enlarged and partially cut away, showing a first embodiment of the device for transferring a web, -
Fig. 3b shows a partially cutaway of a second embodiment of the device for transferring a web, -
Fig. 3c shows a partially sectioned third embodiment of the device for transferring a web, -
Fig. 4 schematically shows a plan view of the device for transferring a web according to the first embodiment, -
Fig. 5 schematically shows a front view of the device for transferring a web according to the first embodiment, -
Fig. 6 1 schematically shows a perspective side view of the device for transferring a web according to the first embodiment, -
Fig. 7 schematically shows a plan view according toFig. 4 with representation of the second nozzle device, -
Fig. 8a schematically shows the louver according toFig. 3a showing the flow generated by the second nozzle device, -
Fig. 8b schematically shows an air guiding device with an assignment of the nozzle tube of the second nozzle device according to a fourth embodiment, -
Fig. 8c schematically shows an air guiding device with an assignment of the nozzle tube of the second nozzle device according to a fifth embodiment, -
Fig. 8d schematically shows an air guiding device with an assignment of the nozzle tube of the second nozzle device according to a sixth embodiment, -
Fig. 8e shows schematically an air guiding device with an assignment of the nozzle tubes of the second nozzle device according to a seventh embodiment, -
9a and 9c to 9e show the theFig. 8a to 8d associated flow connection of adjacent flow fields.
Die Erfindung betrifft eine Vorrichtung zum Überführen einer Bahn in einer Station einer Bahn-Herstellungs- oder Verarbeitungsmaschine. Im Zusammenhang mit der Erfindung kann die bahnbildende Maschine als Papier- oder Kartonmaschine als auch als eine Gewebe- oder Faserstoffmaschine ausgebildet sein.The invention relates to a device for transferring a web in a station of a web-making or processing machine. In connection with the invention, the web-forming machine can be designed as a paper or board machine as well as a woven or pulp machine.
Die
Wie
Der Schaber 5 bildet ferner vorzugsweise eine Halterung für ein Bahnaufführungsbauteil 6. Der Schaber 5 ist dazu auf/mit einer am Gestell 9 gelagerten Achse 13 schwenkbar gelagert. Die Schaberklinge 12 als auch das Bahnaufführungsbauteil 6 sind demzufolge ausrichtbar zum jeweiligen Trockenzylinder 4 und zur freien Laufstrecke 11 zwischen zwei Trockenzylindern 4. Die Ausrichtung erfolgt vorzugsweise um eine Achse 13, die sich in Maschinenquerrichtung erstreckt.The
Wie
Der Leiteinrichtung 14, die vorzugsweise eine Luftleiteinrichtung ist, ist einlaufseitig, d.h. benachbart zur Schaberklinge 12, eine erste Düseneinrichtung 15 zugeordnet. Wie
Der Leiteinrichtung 14 ist ferner auslaufseitig eine zweite Düseneinrichtung 18 zugeordnet, die der Erzeugung einer zweiten Gasströmung 19 dient, die im Wesentlichen in Förderrichtung L verläuft. Die Strahlbreite der zweiten Gasströmung 19 erstreckt sich ebenfalls quer zur Förderrichtung L und vorzugsweise in Maschinenquerrichtung.The
Die Einzeldüsen 16 der ersten Düseneinrichtung 15 ragen in Mischkammern 20, in denen der jeweils aus der Einzeldüse 16 austretende Fluidstrahl 21 einen Treibstrahl bildet. Der Fluidstrahl 21 tritt mit möglichst hoher Geschwindigkeit aus der Einzeldüse 16 aus. Die Mischkammer 20 bildet einen hohlraumförmigen Abschnitt, in dem Normaldruck herrscht. An den hohlraumförmigen Abschnitt kann sich ein Gasführungsleitweg 22 anschließen. Dieser Gasführungsleitweg 22 ist beispielsweise eine winkelige oder gerundete Vertiefung. Die Mischkammern 20 und gegebenenfalls die Gasführungsleitwege 22 sind in einer Führungsplatte 23 angeordnet, die über Befestigungseinrichtungen 24 (vgl.
Der jeweilige Fluidstrahl 21 beschleunigt in der zugehörigen Mischkammer 20 ein Saugmedium, das eine Saugströmung 25 zum Steuern einer Luftströmung 26 auf einem Laufwegabschnitt 27 zwischen den beiden Gasströmungen 17, 19 nachfördert. Zur Verdeutlichung der erfindungsgemäßen Beeinflussung des Laufweges des Randstreifens 7 ist in
Zum Nachfördern der Saugströmung 25 ist beispielsweise gemäß dem in
Das in
Das in
Für die vorstehend beschriebenen Ausführungsbeispiele gilt in gleicher Weise noch die nachfolgende Beschreibung.For the embodiments described above, the following description applies in the same way.
Die erste Düseneinrichtung 15, die in Förderrichtung L die vorderste Düseneinrichtung ist, umfasst ein Zuführrohr 35, das ein Blasrohr bildet, aus dem die Einzeldüsen 16 mit Gas, insbesondere Luft, gespeist werden. Druck und Volumenstrom des zugeführten Gases sind anwendungsbezogen einstellbar. Die Gasströmung 17 der ersten Düseneinrichtung 15 verläuft vorzugsweise unter einem Winkel zum Mantel des Trockenzylinders 4. Die Gasströmung 17 bewirkt, dass sich ein Gas- bzw. Luftfilm auf der Leiteinrichtung 14 ausbildet, der den Randstreifen 7 der Materialbahn trägt und weiterleitet. Durch die eine Düsenreihe bildenden Einzeldüsen 16 wird ein Luftteppich gebildet.The
Die nachfolgende zweite Düseneinrichtung 18 weist ein zweites Zuführrohr 36 auf, das ebenfalls ein Blasrohr bildet, aus dem der Gasstrom 19, insbesondere ein Luftstrom, austritt. Die zweite Düseneinrichtung 18 kann in bekannter Weise ausgebildet sein.The following
Vorzugsweise umfasst die zweite Düseneinrichtung 18 eine Mehrzahl in Reihe angeordnete zweite Einzeldüsen 37, die von dem zweiten Zuführrohr 36 gespeist werden. Die ersten Einzeldüsen 16 und die zweiten Einzeldüsen 37 sind vorzugsweise als Freistrahldüsen, insbesondere Lochdüsen, ausgebildet.Preferably, the second nozzle means 18 comprises a plurality of second
Zur Vermeidung des Problems, dass der Luftteppich am Ende der Leiteinrichtung 14 abreißt, da an dieser Stelle das Druckpolster, das sich an der Unterseite des Papier(Rand)streifens bildet, durch die fehlende Leiteinrichtung 14 plötzlich abbaut, ist Folgendes vorzugsweise vorgesehen.To avoid the problem that the air carpet at the end of the
Wie
Die Gas-, insbesondere Luftströmungen 19, 40 verbinden sich am Ende des Deckbleches 38 und generieren ein hinreichendes Druckpolster. Die weiteren Düsen 39 sind vorzugsweise jeweils zwischen zwei Einzeldüsen 37 angeordnet.The gas, in particular air flows 19, 40 connect at the end of the
Das Deckblech 38 besitzt in Förderrichtung L vorzugsweise eine Blendenlänge, die größer ist als eine Länge der Einzeldüsen 37 der zweiten Düseneinrichtung 18.The
Die Gaszufuhren über die Zuführrohre 35, 36 können unterschiedliche Drücke aufweisen und entsprechend gesteuert werden.The gas supply via the
Erfindungsgemäß ist deshalb vorgesehen, dass die Einzeldüsen 37 der zweiten Düseneinrichtung 18 als Düsenröhrchen ausgebildet sind und Strömungsfelder 43 generieren, die mindestens teilweise unterschiedlich gerichtet sind.According to the invention, it is therefore provided that the
Der vorgenannte Einschnüreffekt lässt sich nämlich vermeiden, wenn, wie in
Gemäß
Das zugehörige Strömungsbild gemäß
Gemäß
Gemäß
Die vorstehend beschriebenen. Anordnungsvarianten sind auch miteinander kombinierbar.The ones described above. Arrangement variants can also be combined with each other.
Die vorstehenden Ausführungen zu den
Claims (11)
- Device for transferring a web in a station of a web production or processing machine, in particular for guiding the edge strip (7) of a material web, comprising a guide apparatus (14) which extends along a running path of the web and which, on the inlet side, has a first nozzle apparatus (15) which has individual nozzles (16) that are used to generate a first gas flow (17), which extends substantially counter to the conveying direction (L) of the material web and which, on the outlet side, has a second nozzle apparatus (18) which has individual nozzles (37) that are used to generate a second gas flow (19), which extends substantially in the conveying direction (L), and the individual nozzles (16, 37) are free jet nozzles, the individual nozzles (37) of the second nozzle apparatus (18) being configured as nozzle tubes, characterized in that the individual nozzles (37) of the second nozzle apparatus (18) generate flow fields which are at least partly oriented differently and are combined to form an overall flow.
- Device according to claim 1, characterized in that the individual nozzles (37) arranged in a row on the outside are arranged at angles with an angle that faces away from a jet centre.
- Device according to claim 1 or 2, characterized in that the individual nozzles (37) arranged in a row on the inside are arranged so as to be set at an angle towards each other in pairs.
- Device according to one of claims 1 to 3, characterized in that the individual nozzles (37) arranged in a row on the inside are arranged in pairs, there being a greater row spacing between two pairs than between the two individual nozzles (37) forming a pair.
- Device according to one of claims 1 to 4, characterized in that the individual nozzles (37) arranged in a row on the inside have nozzle tubes of different lengths in pairs.
- Device according to one of claims 1 to 5, characterized in that the second nozzle apparatus (18) is arranged underneath a covering plate (38).
- Device according to claim 6, characterized in that the second nozzle apparatus (18) is assigned further nozzles (39), which are formed as Coanda nozzles and generate an air flow on the upper side of the covering plate (38).
- Device according to claim 7, characterized in that the covering plate (38) has a plate length which is greater than a length of the individual nozzles (37) of the second nozzle apparatus (18).
- Device according to one of claims 1 to 8, characterized in that the individual nozzles (16) of the first nozzle apparatus (15) project into mixing chambers (20), in which the respective fluid jet (21) forms a propulsion jet which, in the respective mixing chamber (20), accelerates a suction medium which feeds a suction flow (25) for controlling an air flow (26) on an upper side of the guide apparatus (14) between the two gas flows (17, 19).
- Device according to claim 9, characterized in that the mixing chambers (20) have suction connectors (33), via which suction medium can be fed in from an upper side of the guide apparatus (14).
- Device according to claim 9, characterized in that on a rear wall (28) of the mixing chambers (20) there is formed a passage (29) which forms a feed line for the suction flow (25).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011016587A DE102011016587A1 (en) | 2011-04-08 | 2011-04-08 | Apparatus for transferring a web in a station of a web manufacturing or processing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2508672A1 EP2508672A1 (en) | 2012-10-10 |
EP2508672B1 true EP2508672B1 (en) | 2015-03-11 |
Family
ID=46027505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20120002280 Active EP2508672B1 (en) | 2011-04-08 | 2012-03-29 | Device for transferring a web in a station of a web production or processing machine |
Country Status (2)
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EP (1) | EP2508672B1 (en) |
DE (1) | DE102011016587A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102016221156A1 (en) | 2015-11-06 | 2017-05-11 | Schaeffler Technologies AG & Co. KG | Dual mass flywheel and sliding bearing for this |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI62571C (en) * | 1980-12-01 | 1983-01-10 | Valmet Oy | ANORDNING VID FLERCYLINDERTORK I EN PAPPERSMASKIN |
DE3941242A1 (en) | 1989-12-14 | 1991-06-20 | Voith Gmbh J M | Guide plate for threading strip into paper machine - has guiding surface parallel to strip path and inlets for air to feed grooves in guide plate surface |
US5337490A (en) * | 1993-06-21 | 1994-08-16 | Champion International Corporation | Single tier dryer threading nozzle for paper machines |
DE19548303B4 (en) * | 1995-12-22 | 2006-08-31 | Voith Paper Patent Gmbh | drying section |
DE19726895A1 (en) * | 1997-06-25 | 1999-01-07 | Voith Sulzer Papiermasch Gmbh | Machine for the production of a material web |
DE10142519A1 (en) * | 2001-08-30 | 2003-03-27 | Voith Paper Patent Gmbh | Assembly to detach a paper/cardboard web from a roller, to travel to the next workstation, has a blower jet and a guide wall to keep the high speed web taut in its path to the next production stage |
-
2011
- 2011-04-08 DE DE102011016587A patent/DE102011016587A1/en not_active Withdrawn
-
2012
- 2012-03-29 EP EP20120002280 patent/EP2508672B1/en active Active
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EP2508672A1 (en) | 2012-10-10 |
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