EP2508675A1 - Device for transferring a web within a web production or processing machine - Google Patents
Device for transferring a web within a web production or processing machine Download PDFInfo
- Publication number
- EP2508675A1 EP2508675A1 EP12002281A EP12002281A EP2508675A1 EP 2508675 A1 EP2508675 A1 EP 2508675A1 EP 12002281 A EP12002281 A EP 12002281A EP 12002281 A EP12002281 A EP 12002281A EP 2508675 A1 EP2508675 A1 EP 2508675A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- nozzle
- suction
- flow
- nozzles
- 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
Links
- 238000012545 processing Methods 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title description 5
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 description 14
- 238000007664 blowing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 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
- 238000011144 upstream manufacturing 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/04—Doctors for 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.
- 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 Vietnamese enclosuresnuten, so that the above-mentioned disadvantages occur here in the same way.
- the object of the invention is therefore to provide a device for transferring a web in a station of a web-making or processing machine, which is simple in construction and allows safe transfer of the web at high web speeds.
- a device for transferring the web is created, the one Gas flow, in particular blowing air, used as a driving medium, which sucks air by a pulse exchange.
- a suction zone formed thereby acts on the edge strip, which is sucked in as a leader strip and abuts against a guide. Centrifugal forces are compensated, so that the edge strip is optimally passed through the guide. This has the consequence that a significant reduction in the pressure and in particular the volume of the supplied gas flow is possible without the edge strip tends to flutter on free routes.
- a blowing effect is first exerted by a first gas flow on the edge strips to be transported in a first section, then a sucking effect by a suction flow and then in a final section finally again a blowing effect by a second gas flow.
- the edge strip is carried and guided during transfer by these two gas flows.
- the suction flow creates a negative pressure, whereby the guidance of the edge strip is stabilized, since the run of the edge strip on the guide calms down and the application to the guide device is improved.
- the device according to the invention is robust and requires little maintenance.
- the consumption of propellant is considerably reduced compared to known devices.
- the mixing chambers are provided in bores of a guide plate, wherein the guide plate is arranged as a part of the guide on a holder, in particular a scraper holder.
- the bores form flow channels in which propulsion jets of the first gas flow emerge.
- the pressure in the flow is lower than in the mixing chambers, which are preferably under normal pressure.
- the medium in the mixing chambers is entrained as a suction medium.
- the mixing chambers preferably each have at least one suction opening through which air is sucked. Sucking is preferably in the cross-machine direction and at an upper side of the guide on which the edge strip is guided.
- the suction opening may each be formed by an open rear wall of the mixing chambers or an opening in a chamber wall of the mixing chamber adjacent to the track of the edge strip.
- the suction flow provided according to the invention can be directed in relation to a track by providing a perforated cover plate on the upper side of the guide.
- the hole assembly preferably extends in the cross-machine direction and is disposed downstream of nozzle outlets of the first gas flow, the downstream distance being selectable depending on the grade and weight of the web.
- 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 is used to prevent winding of a cracked web on the drying cylinder 4 and separates when performing an edge strip 7 this from the drying cylinder 4.
- the doctor blade 12 therefore preferably extends over the entire width of the drying cylinder 4th
- 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.
- 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 on the edge strip 7 in his Whole width acts 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. It is thus produced a suction zone, the acts on the edge strip by this is sucked and rests against the guide 14.
- the centrifugal forces that would force the edge strip 7 a curved track see. Fig. 3a dashed edge strip 7 (St.dT)
- 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 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 a 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 a gas or air film to form on the guide 14, 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 does not have 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 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.
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- Drying Of Solid Materials (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
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
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 so genannten 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
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 bei hohen Bahngeschwindigkeiten eine sichere Überführung der Bahn erlaubt.The object of the invention is therefore to provide a device for transferring a web in a station of a web-making or processing machine, which is simple in construction and allows safe transfer of the web at high web speeds.
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 eine Gasströmung, insbesondere Blasluft, als ein Treibmedium einsetzt, das durch einen Impulsaustausch Luft ansaugt. Eine dadurch gebildete Saugzone wirkt auf den Randstreifen, der als ein Aufführstreifen angesaugt wird und sich an eine Leiteinrichtung anlegt. Fliehkräfte werden dadurch kompensiert, so dass der Randstreifen optimal durch die Leiteinrichtung weitergereicht wird. Dies hat zur Folge, dass eine erhebliche Reduzierung des Drucks und insbesondere des Volumens der zugeführten Gasströmung möglich ist, ohne dass der Randstreifen auf frei geführten Strecken zum Flattern neigt.As a result, a device for transferring the web is created, the one Gas flow, in particular blowing air, used as a driving medium, which sucks air by a pulse exchange. A suction zone formed thereby acts on the edge strip, which is sucked in as a leader strip and abuts against a guide. Centrifugal forces are compensated, so that the edge strip is optimally passed through the guide. This has the consequence that a significant reduction in the pressure and in particular the volume of the supplied gas flow is possible without the edge strip tends to flutter on free routes.
Bei der erfindungsgemäßen Vorrichtung wird auf den zu transportierenden Randstreifen in einem ersten Abschnitt zunächst eine blasende Wirkung durch eine erste Gasströmung ausgeübt, danach eine saugende Wirkung durch eine Saugströmung und dann in einem letzten Abschnitt schließlich wieder eine blasende Wirkung durch eine zweite Gasströmung ausgeübt. Der Randstreifen wird beim Überführen durch diese beiden Gasströmungen getragen und geführt. Die Saugströmung erzeugt einen Unterdruck, wodurch die Führung des Randstreifens stabilisiert wird, da der Lauf des Randstreifens an der Leiteinrichtung beruhigt und das Anlegen an die Leiteinrichtung verbessert wird.In the apparatus according to the invention, a blowing effect is first exerted by a first gas flow on the edge strips to be transported in a first section, then a sucking effect by a suction flow and then in a final section finally again a blowing effect by a second gas flow. The edge strip is carried and guided during transfer by these two gas flows. The suction flow creates a negative pressure, whereby the guidance of the edge strip is stabilized, since the run of the edge strip on the guide calms down and the application to the guide device is improved.
Die erfindungsgemäße Vorrichtung ist dabei robust und wartungsarm. Der Verbrauch an Treibmittel ist gegenüber bekannten Vorrichtungen erheblich reduziert.The device according to the invention is robust and requires little maintenance. The consumption of propellant is considerably reduced compared to known devices.
Vorzugsweise sind die Mischkammern in Bohrungen einer Führungsplatte vorgesehen, wobei die Führungsplatte als ein Teil der Leiteinrichtung an einer Halterung, insbesondere einer Schaberhalterung, angeordnet ist. Die Bohrungen bilden Strömungskanäle, in denen Treibstrahlen der ersten Gasströmung austreten. Hierbei entsteht gemäß dem Gesetz von Bernoulli ein Druckabfall. Der Druck in der Strömung ist geringer als in den Mischkammern, die vorzugsweise unter Normaldruck stehen. Das in den Mischkammern befindliche Medium wird als Saugmedium mitgerissen.Preferably, the mixing chambers are provided in bores of a guide plate, wherein the guide plate is arranged as a part of the guide on a holder, in particular a scraper holder. The bores form flow channels in which propulsion jets of the first gas flow emerge. Here, according to the law of Bernoulli, a pressure drop arises. The pressure in the flow is lower than in the mixing chambers, which are preferably under normal pressure. The medium in the mixing chambers is entrained as a suction medium.
Die Mischkammern weisen vorzugsweise jeweils mindestens eine Saugöffnung auf, über die Luft angesaugt wird. Angesaugt wird vorzugsweise in Maschinenquerrichtung und an einer Oberseite der Leiteinrichtung, an der der Randstreifen geführt ist. Die Saugöffnung kann beispielsweise jeweils von einer offenen Hinterwand der Mischkammern oder einer Öffnung in einer Kammerwand der Mischkammer benachbart zur Laufbahn des Randstreifens gebildet werden.The mixing chambers preferably each have at least one suction opening through which air is sucked. Sucking is preferably in the cross-machine direction and at an upper side of the guide on which the edge strip is guided. For example, the suction opening may each be formed by an open rear wall of the mixing chambers or an opening in a chamber wall of the mixing chamber adjacent to the track of the edge strip.
Die erfindungsgemäß vorgesehene Saugströmung kann gegenüber einer Laufbahn gelenkt werden, indem an der Oberseite der Leiteinrichtung ein perforiertes Abdeckblech vorgesehen ist. Die Lochanordnung erstreckt sich vorzugsweise in Maschinenquerrichtung und ist laufabwärts von Düsenaustritten der ersten Gasströmung angeordnet, wobei der laufabwärtige Abstand je nach Sorte und Gewicht der Bahn wählbar ist.The suction flow provided according to the invention can be directed in relation to a track by providing a perforated cover plate on the upper side of the guide. The hole assembly preferably extends in the cross-machine direction and is disposed downstream of nozzle outlets of the first gas flow, the downstream distance being selectable depending on the grade and weight of the web.
Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.
Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.
-
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. 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.
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.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
Claims (12)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102011016588A DE102011016588A1 (en) | 2011-04-08 | 2011-04-08 | Device for transferring a web in a station of a web-making or processing machine |
Publications (2)
Publication Number | Publication Date |
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EP2508675A1 true EP2508675A1 (en) | 2012-10-10 |
EP2508675B1 EP2508675B1 (en) | 2013-07-24 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20120002281 Active EP2508675B1 (en) | 2011-04-08 | 2012-03-29 | Device for transferring a web within a web production or processing machine |
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EP (1) | EP2508675B1 (en) |
DE (1) | DE102011016588A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE9109313U1 (en) * | 1991-07-27 | 1991-09-26 | J.M. Voith Gmbh, 7920 Heidenheim | Device for guiding a moving web |
EP0868571B1 (en) | 1995-12-22 | 2001-05-23 | Voith Paper Patent GmbH | Dry end |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI76142C (en) * | 1985-11-14 | 1988-09-09 | Valmet Oy | FICKVENTILATIONSFOERFARANDE OCH -ANORDNING I EN PAPPERSMASKINS MAONGCYLINDERTORK. |
DE10115618A1 (en) * | 2001-03-26 | 2002-10-02 | Voith Paper Patent Gmbh | Method and device for transferring a web |
-
2011
- 2011-04-08 DE DE102011016588A patent/DE102011016588A1/en not_active Withdrawn
-
2012
- 2012-03-29 EP EP20120002281 patent/EP2508675B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE3941242C2 (en) | 1989-12-14 | 1992-10-15 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
DE9109313U1 (en) * | 1991-07-27 | 1991-09-26 | J.M. Voith Gmbh, 7920 Heidenheim | Device for guiding a moving web |
EP0868571B1 (en) | 1995-12-22 | 2001-05-23 | Voith Paper Patent GmbH | Dry end |
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DE102011016588A1 (en) | 2012-10-11 |
EP2508675B1 (en) | 2013-07-24 |
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