EP0513632A1 - Device for removing liquid from the surface of a moving strip - Google Patents

Device for removing liquid from the surface of a moving strip Download PDF

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Publication number
EP0513632A1
EP0513632A1 EP92107560A EP92107560A EP0513632A1 EP 0513632 A1 EP0513632 A1 EP 0513632A1 EP 92107560 A EP92107560 A EP 92107560A EP 92107560 A EP92107560 A EP 92107560A EP 0513632 A1 EP0513632 A1 EP 0513632A1
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EP
European Patent Office
Prior art keywords
belt
nozzle
slot
jet
running direction
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
EP92107560A
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German (de)
French (fr)
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EP0513632B1 (en
Inventor
Carl Prof. Dr. Ing. Kramer
Bernd Konrath
Bernd Dr. Ing. Berger
Peter Reinthal
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.)
Sundwiger Eisenhuette Maschinenfabrik & Co GmbH
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Sundwiger Eisenhuette Maschinenfabrik & Co GmbH
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Publication of EP0513632A1 publication Critical patent/EP0513632A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/24—Arrangements of devices using drying processes not involving heating
    • F26B13/28—Arrangements of devices using drying processes not involving heating for applying pressure; for brushing; for wiping
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D15/00—Apparatus for treating processed material
    • G03D15/02—Drying; Glazing

Definitions

  • the invention relates to a device for removing liquid from the surface of a moving strip, in particular a rolled strip on a roll stand, by means of gas, in particular air, which is inflated onto the moving strip.
  • Devices of this type are required, in particular to remove oil and emulsion residues from high-speed metallic rolled strips, which were applied to the strip as lubricants during the rolling process. If this removal is not carried out to a sufficient extent, the liquid residues remaining when the tape is wound up into a tape bundle between the individual turns act like a lubricating film, and the tape can tend to telescope, i.e. shift in the direction of the reel axis when the tape is wound up. In addition, very low amounts of lubricant residues, based on the surface of the rolled strip, are usually prescribed for the further processing of the strips.
  • the invention has for its object to provide a device with which the disadvantages described are avoided.
  • a cas jet that is optimally designed in terms of flow technology is used to adequately remove the liquid film from the belt surface generates the necessary wall shear stress on the belt and this liquid film pushed on by the gas jet is sucked evenly over the belt width with a suction gap arranged in front of the slot jet when viewed in the direction of belt travel.
  • the suction capacity of the gas jet is matched to the gas stream blown out with the slot nozzle in such a way that at least this volume flow, which also contains the peeled lubricant, is detected and removed by the suction gap. In this way it is avoided that blown-off lubricant collects on the roll stand construction or is accumulated on the belt in front of the blow-off device and can get back onto the already blown-off belt.
  • the invention is based on the knowledge that the main reason for the unsatisfactory removal of the lubricant residues from the belt by blowing off in the prior art is that the impact velocity achieved with the nozzles on the belt and thus the wall shear stress acting on the belt surface due to flow movement increases is low.
  • the ratio of the nozzle spacing to the nozzle slot width is substantially greater than the core jet length, or, in the case of overexpandable compressible jets, greater than the jet length in which high-speed zones, so-called supersonic drums, are created.
  • the ratio of the distance h of the nozzle from the moving belt to the width s of the gas jet is in the range from 2 to 10. In this way it is ensured that the gas jet actually achieves the highest possible impact velocity for a specific inflow situation to the nozzle becomes.
  • the invention can also be used from an economic point of view achieve a satisfactory result.
  • the inventive configuration and arrangement of the slit jet nozzle makes it possible to achieve the speeds of 300 m / s or more required for the removal of rolling oil from a metal strip during normal operation of the blow-off nozzle with air. In the invention, this can be achieved with comparatively low pressures of only a maximum of only 2 bar, while in known nozzles an air pressure of 4-6 bar is not yet sufficient for cleaning the metal strip.
  • the invention can be implemented with or without squeeze rollers arranged upstream in the strip running direction. If there are no squeeze rollers or if the device for removing rolling oil or roller emulsion has to be arranged at a greater distance from the squeeze rollers, two slot nozzles are preferably inclined relative to one another above and possibly below the belt. The suction slot is then between the two slot nozzles. In this case, the suction is to be dimensioned such that the gas streams inflated onto the belt by the two slot nozzles, including the liquid, are captured by the suction.
  • the required velocity of impact of the gas flowing out of the nozzle and thus the required supply pressure of the slot nozzles depends on the properties of the liquids to be removed from the belt. With a relatively warm belt and roller emulsion, relatively low impact speeds in the range of approximately Mach 0.3 are sufficient, corresponding to approximately 100 m / s. In the case of higher-viscosity rolling oils, experience has shown that arrival speeds at the strip surface around Mach 1 corresponding to approx. 300 m / s are required for medium to high rolling speeds.
  • the nozzle gap is designed in the manner of a Lavall nozzle with a narrowest cross section and a subsequent expansion part shaped according to gas-dynamic considerations, which allows the flow to be accelerated to speeds higher than the speed of sound.
  • FIG. 1 there is a squeezing roller 1, 2 above and below the belt B. So that there is no rolling effect, the axes 1a, 2a of these squeezing rollers 1, 2 are slightly offset from one another in the strip running direction.
  • a slot jet nozzle 3 which ⁇ a Casstrahl at an angle of between 45 o and 90 o inclined to the running direction L of the band B toward the band surface.
  • the slot jet nozzle 3 is arranged at a distance h from the surface of the belt B.
  • the gas jet emerging from it has the same width s as the slot of the nozzle 3 itself in the case of a non-widened nozzle opening in the region of the nozzle outlet opening.
  • a suction gap 4 is in the case shown on the one Side formed by the correspondingly shaped nozzle body 5 and on the other side by the squeeze roller 1.
  • the underside 5a of the nozzle body 5 has a step 5b in the area between the nozzle gap 3a and the suction gap 4, which ensures that the nozzle body 5 does not influence the speed field of the gas jet. In this way, the full impact velocity of the gas jet has an effect on the wall shear stress arising on the belt surface.
  • the slot nozzle 3 is supplied by a supply channel 5c which extends over the entire bandwidth.
  • the suction gap 4 is connected to a suction swirl tube 6 by a correspondingly narrow rectangular channel over the entire width of the band B.
  • the volume flow to be extracted is expediently discharged to both sides, that is to say both to the front and to the rear, from the suction swirl tube 6. With smaller working widths, the one-sided derivation of the suction flow can also be sufficient.
  • the flow arrows shown illustrate the effect of the suction swirl tube 6.
  • the suction gap 4 is - in deviation from the different proportions of the schematic drawing for reasons of illustration - dimensioned much larger than the nozzle gap 3a, because on the one hand the suction speed is significantly lower than the blow-out speed from the nozzle gap 3a and on the other hand the volume flow to be suctioned is larger by the proportion must, in addition to the volume flow emerging from the nozzle gap, for example is sucked in at the edges of band B.
  • the slot nozzle 3 can have different shapes. In the embodiment shown enlarged in FIG. 2, it has an extension part 3b in the nozzle gap 3a, similar to a Lavall nozzle. In this nozzle, the width of the slit jet is equal to the width s at the narrowest point of the slit nozzle 3.
  • the extension part 3b means that the flow is accelerated beyond the speed of sound and strikes the belt B with an even higher arrival speed. In this way, the wiping effect of the gas jet emerging from the nozzle 3 can be increased even further with relatively simple means, namely only by an appropriate design of the nozzle gap 3a, without the nozzle pressure having to be increased in an uneconomical manner.

Abstract

Eine Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines bewegten Bandes (B), insbesondere eines Walzbandes an einem Walzgerüst, mittels auf das bewegte Band (B) aufgeblasenen Gases, insbesondere Luft, ist erfindungsgemäß dadurch gekennzeichnet, daß quer zur Bandlaufrichtung (L) eine Schlitzstrahldüse (3) angeordnet ist, die mit einer Neigung (β) von 45<o> bis 90<o> ihrer Strahlrichtung gegen die Bandlaufrichtung (L) auf die Bandoberfläche gerichtet ist, daß das Verhältnis aus Düsenabstand (h) der Schlitzstrahldüse (3) von dem bewegten Band (B) zur Breite (s) des Schlitzes im Bereich h/s = 2 bis h/s = 10 liegt, so daß die Austrittsgeschwindigkeit des mit der Schlitzstrahldüse (3) auf das Band (B) aufgeblasenen Gasstrahls im Bereich von 0,3 < Mach < 2 liegt, und daß in einem Abstand von 5 bis 25 Düsenabständen (h) in Laufrichtung (L) des Bandes (B) vor der Auftrefflinie des aus der Schlitzstrahldüse (3) austretenden Gasstrahles über dem Band (B) ein Absaugspalt (4) angeordnet ist. <IMAGE>A device for removing liquid from the surface of a moving belt (B), in particular a rolling belt on a roll stand, by means of gas, in particular air, which is inflated onto the moving belt (B), is characterized according to the invention in that a transverse to the belt running direction (L) Slot jet nozzle (3) is arranged, which is directed at an inclination (β) of 45 <o> to 90 <o> its jet direction against the tape running direction (L) on the tape surface, that the ratio of the nozzle distance (h) of the slot jet nozzle (3rd ) from the moving belt (B) to the width (s) of the slot is in the range h / s = 2 to h / s = 10, so that the exit velocity of the gas jet inflated onto the belt (B) by the slot jet nozzle (3) Range of 0.3 <Mach <2, and that at a distance of 5 to 25 nozzle intervals (h) in the running direction (L) of the belt (B) before the line of incidence of the gas jet emerging from the slot jet nozzle (3) over the belt ( B) an Ab suction gap (4) is arranged. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines bewegten Bandes, insbesondere eines Walzbandes an einem Walzgerüst, mittels auf das bewegte Band aufgeblasenen Gases, insbesondere Luft.The invention relates to a device for removing liquid from the surface of a moving strip, in particular a rolled strip on a roll stand, by means of gas, in particular air, which is inflated onto the moving strip.

Derartige Vorrichtungen sind erforderlich, um insbesondere von schnellaufenden metallischen Walzbändern Öl- und Emulsionsreste zu entfernen, welche beim Walzvorgang als Schmiermittel auf das Band aufgebracht wurden. Erfolgt diese Entfernung nicht im ausreichenden Maße, so wirken die beim Aufhaspeln des Bandes zu einem Bandbund zwischen den einzelnen Windungen verbleibenden Flüssigkeitsreste wie ein Schmierfilm, und das Band kann zum Teleskopieren neigen, sich also beim Aufhaspeln in Haspelachsrichtung verschieben. Außerdem sind für die Weiterverarbeitung der Bänder üblicherweise sehr niedrige Schmiermittelrückstandsmengen, bezogen auf die Oberfläche des Walzbandes, vorgeschrieben.Devices of this type are required, in particular to remove oil and emulsion residues from high-speed metallic rolled strips, which were applied to the strip as lubricants during the rolling process. If this removal is not carried out to a sufficient extent, the liquid residues remaining when the tape is wound up into a tape bundle between the individual turns act like a lubricating film, and the tape can tend to telescope, i.e. shift in the direction of the reel axis when the tape is wound up. In addition, very low amounts of lubricant residues, based on the surface of the rolled strip, are usually prescribed for the further processing of the strips.

Schon seit längerem wird versucht, die Schmiermittelrückstände vom Band durch Abblasen zu entfernen. Die dabei erzielte Wirkung ist jedoch nicht ausreichend.For some time now, attempts have been made to remove the lubricant residues from the belt by blowing them off. However, the effect achieved is not sufficient.

Wegen dieser Schwierigkeiten bei bekannten Abblasesystemen werden an modernen Walzgerüsten fast ausschließlich mechanisch abstreifende Systeme verwendet. Diese mechanisch abstreifenden Systeme bestehen aus zwei hintereinandergesshalteten Gummilippen, die auf die Bandoberfläche aufgedrückt werden. Zwischen diesen Gummilippen erfolgt eine Absaugung des mit den Lippen vom Band abgeschälten Schmiermittels. Der Nachteil dieser Einrichtungen ist, daß die Gummilippen empfindliche Bandoberflächen beschädigen, insbesondere wenn sich Schmutzpartikel an den Gummilippen festgesetzt haben.Because of these difficulties with known blow-off systems, mechanical stripping systems are used almost exclusively on modern rolling stands. These mechanically wiping systems consist of two rubber lips that are held together and pressed onto the belt surface. The lubricant peeled off the belt with the lips is sucked off between these rubber lips. The disadvantage of these devices is that the rubber lips damage sensitive tape surfaces, especially if dirt particles have settled on the rubber lips.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, mit der die beschriebenen Nachteile vermieden werden.The invention has for its object to provide a device with which the disadvantages described are avoided.

Diese Aufgabe wird dadurch gelöst, daß quer zur Bandlaufrichtung eine Schlitzstrahldüse angeordnet ist, die mit einer Neigung von 45o bis 90o ihrer Strahlrichtung gegen die Bandlaufrichtung auf die Bandoberfläche gerichtet ist, daß das Verhältnis aus Düsenabstand der Schlitzstrahldüse von dem bewegten Band zur Breite des Schlitzes im Bereich h/s = 2 bis h/s = 10 liegt, so daß die Austrittsgeschwindigkeit des mit der Schlitzstrahldüse auf das Band aufgeblasenen Gasstrahls im Bereich von 0,3 < Mach < 2 liegt, und daß in einem Abstand von 5 bis 25 Düsenabständen in Laufrichtung des Bandes vor der Auftrefflinie des aus der Schlitzstrahldüse austretenden Gasstrahles über dem Band ein Absaugspalt angeordnet ist.This object is achieved in that a slot jet nozzle is arranged transversely to the tape running direction, which is directed at an inclination of 45 o to 90 o of its jet direction against the tape running direction onto the tape surface, that the ratio of the nozzle distance of the slot jet nozzle from the moving tape to the width of the Slot lies in the range h / s = 2 to h / s = 10, so that the exit velocity of the gas jet blown onto the belt with the slot jet nozzle is in the range of 0.3 <Mach <2, and that at a distance of 5 to 25 A suction gap is arranged above the belt in the direction of travel of the belt in front of the line of impact of the gas jet emerging from the slot jet nozzle.

Bei dieser Lösung wird mit einem strömungstechnisch optimal ausgelegten Casstrahl die zu einer ausreichenden Entfernung des Flüssigkeitsfilms von der Bandoberfläche notwendige Wandschubspannung am Band erzeugt und dieser vom Gasstrahl aufgeschobene Flüssigkeitsfilm mit einem in Bandlaufrichtung betrachtet vor dem Schlitzstrahl angeordneten Absaugspalt gleichmäßig über die Bandbreite abgesaugt. Dabei ist die Absaugekapazität des Gasstrahls derart auf den mit der Schlitzdüse ausgeblasenen Gasstrom abgestimmt, daß mindestens dieser Volumenstrom, welcher auch das abgeschälte Schmiermittel enthält, vom Saugspalt erfaßt und abgeführt wird. Auf diese Weise wird vermieden, daß abgeblasenes Schmiermittel sich an der Walzgerüstkonstruktion sammelt oder auf dem Band vor der Abblaseeinrichtung aufgestaut wird und wieder auf das bereits abgeblasene Band gelangen kann.With this solution, a cas jet that is optimally designed in terms of flow technology is used to adequately remove the liquid film from the belt surface generates the necessary wall shear stress on the belt and this liquid film pushed on by the gas jet is sucked evenly over the belt width with a suction gap arranged in front of the slot jet when viewed in the direction of belt travel. The suction capacity of the gas jet is matched to the gas stream blown out with the slot nozzle in such a way that at least this volume flow, which also contains the peeled lubricant, is detected and removed by the suction gap. In this way it is avoided that blown-off lubricant collects on the roll stand construction or is accumulated on the belt in front of the blow-off device and can get back onto the already blown-off belt.

Die Erfindung geht von der Erkenntnis aus, daß der wesentliche Grund für die unbefriedigende Entfernung der Schmiermittelrückstände vom Band durch Abblasen beim Stand der Technik darin begründet ist, daß die mit den Düsen am Band erzielte Auftreffgeschwindigkeit und damit die an der Bandoberfläche einwirkende Wandschubspannung infolge Strömungsbewegung zu gering ist. Dabei ist bei den üblichen Blasdüsen das Verhältnis von Düsenabstand zu Düsenschlitzbreite wesentlich größer als die Kernstrahllänge, bzw. bei überexpandierenden kompressiblen Strahlen größer als die Strahllänge, in welcher Hochgeschwindigkeitszonen, sogenannte Überschalltönnchen, entstehen.The invention is based on the knowledge that the main reason for the unsatisfactory removal of the lubricant residues from the belt by blowing off in the prior art is that the impact velocity achieved with the nozzles on the belt and thus the wall shear stress acting on the belt surface due to flow movement increases is low. In the case of the usual blowing nozzles, the ratio of the nozzle spacing to the nozzle slot width is substantially greater than the core jet length, or, in the case of overexpandable compressible jets, greater than the jet length in which high-speed zones, so-called supersonic drums, are created.

Gemäß der Erfindung liegt dagegen das Verhältnis aus Abstand h der Düse von dem bewegten Band zur Breite s des Gasstrahls im Bereich von 2 bis 10. Auf diese Weise ist sichergestellt ist, daß mit dem Gasstrahl tatsächlich die für eine bestimmte Zuströmsituation zur Düse höchstmögliche Auftreffgeschwindigkeit erreicht wird. So läßt sich mit der Erfindung auch unter wirtschaftlichen Aspekten ein befriedigendes Ergebnis erreichen. Durch die erfindungsgemäße Ausgestaltung und Anordnung der Schlitzstrahldüse ist es möglich, die zur Entfernung von Walzöl von einem Metallband beim üblichen Betrieb der Abblasedüse mit Luft erforderlichen Geschwindigkeiten von 300 m/s oder mehr zu erreichen. Dies kann bei der Erfindung bereits mit vergleichsweise niedrigen Drücken von etwa nur maximal 2 bar das gewünschte Ergebnis erreicht werden, während bei bekannten Düsen ein Luftdruck von 4 - 6 bar zum Reinigen des Metallbandes noch nicht ausreichend ist.According to the invention, on the other hand, the ratio of the distance h of the nozzle from the moving belt to the width s of the gas jet is in the range from 2 to 10. In this way it is ensured that the gas jet actually achieves the highest possible impact velocity for a specific inflow situation to the nozzle becomes. The invention can also be used from an economic point of view achieve a satisfactory result. The inventive configuration and arrangement of the slit jet nozzle makes it possible to achieve the speeds of 300 m / s or more required for the removal of rolling oil from a metal strip during normal operation of the blow-off nozzle with air. In the invention, this can be achieved with comparatively low pressures of only a maximum of only 2 bar, while in known nozzles an air pressure of 4-6 bar is not yet sufficient for cleaning the metal strip.

Die Erfindung läßt sich mit oder ohne in Bandlaufrichtung vorgeordneten Abquetschwalzen verwirklichen. Falls keine Abquetschwalzen vorhanden sind oder die Vorrichtung zur Entfernung von Walzöl oder Walzemulsion in einem größeren Abstand von den Abquetschwalzen angeordnet werden muß, werden vorzugsweise zwei Schlitzdüsen jeweils gegeneinander geneigt über und gegebenenfalls unter dem Band angeordnet. Der Absaugeschlitz befindet sich dann zwischen den beiden Schlitzdüsen. In diesem Fall ist die Absaugung derart zu bemessen, daß die von beiden Schlitzdüsen auf das Band aufgeblasenen Gasströme einschließlich der Flüssigkeit von der Absaugung erfaßt werden.The invention can be implemented with or without squeeze rollers arranged upstream in the strip running direction. If there are no squeeze rollers or if the device for removing rolling oil or roller emulsion has to be arranged at a greater distance from the squeeze rollers, two slot nozzles are preferably inclined relative to one another above and possibly below the belt. The suction slot is then between the two slot nozzles. In this case, the suction is to be dimensioned such that the gas streams inflated onto the belt by the two slot nozzles, including the liquid, are captured by the suction.

Die erforderliche Auftreffgeschwindigkeit des aus der Düse strömenden Gases und damit der erforderliche Versorgungsdruck der Schlitzdüsen richtet sich nach den Eigenschaften der vom Band zu entfernenden Flüssigkeiten. Bei einem relativ warmen Band und Walzemulsion genügen relativ niedrige Auftreffgeschwindigkeiten im Bereich von etwa Mach 0,3 entsprechend ca. 100 m/s. Bei höher viskosen Walzölen sind für mittlere bis hohe Walzgeschwindigkeiten erfahrungsgemäß Ankunftsgeschwindigkeiten an der Bandoberfläche um Mach 1 entsprechend ca. 300 m/s erforderlich. Noch höhere Ankunftsgeschwindigkeiten können erreicht werden, wenn der Düsenspalt nach Art einer Lavall-Düse mit einem engsten Querschnitt und einem anschließenden nach gasdynamischen Gesichtspunkten geformten Erweiterungsteil ausgebildet ist, der eine Beschleunigung der Strömung auf Geschwindigkeiten höher als die Schallgeschwindigkeit erlaubt.The required velocity of impact of the gas flowing out of the nozzle and thus the required supply pressure of the slot nozzles depends on the properties of the liquids to be removed from the belt. With a relatively warm belt and roller emulsion, relatively low impact speeds in the range of approximately Mach 0.3 are sufficient, corresponding to approximately 100 m / s. In the case of higher-viscosity rolling oils, experience has shown that arrival speeds at the strip surface around Mach 1 corresponding to approx. 300 m / s are required for medium to high rolling speeds. Even higher arrival speeds can can be achieved if the nozzle gap is designed in the manner of a Lavall nozzle with a narrowest cross section and a subsequent expansion part shaped according to gas-dynamic considerations, which allows the flow to be accelerated to speeds higher than the speed of sound.

Im folgenden wird die Erfindung anhand einer ein Ausführungsbeispiel schematisch darstellenden Zeichnung näher erläutert. Es zeigen:

Figur 1
einen Schnitt einer Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines bewegten Bandes,
und
Figur 2
einen vergrößerten Ausschnitt A der Vorrichtung nach Figur 1 in einer abgewandelten Form.
The invention is explained in more detail below with reference to a drawing schematically illustrating an exemplary embodiment. Show it:
Figure 1
1 shows a section of a device for removing liquid from the surface of a moving belt,
and
Figure 2
an enlarged section A of the device of Figure 1 in a modified form.

Gemäß Figur 1 befindet sich oberhalb und unterhalb des Bandes B je eine Abquetschrolle 1,2. Damit keine Walzwirkung entsteht, sind die Achsen 1a,2a dieser Abquetschrollen 1,2 in Bandlaufrichtung geringfügig gegeneinander versetzt. In Bandlaufrichtung betrachtet hinter der Abquetschrolle 1 befindet sich eine Schlitzstrahldüse 3, welche einen Casstrahl unter einem Winkel β zwischen 45o und 90o gegen die Laufrichtung L des Bandes B geneigt auf die Bandoberfläche richtet. Die Schlitzstrahldüse 3 ist in einem Abstand h zur Oberfläche des Bandes B angeordnet. Der aus ihr austretende Gasstrahl hat bei einer nicht erweiterten Düsenöffnung im Bereich der Düsenaustrittsöffnung die gleiche Breite s wie der Schlitz der Düse 3 selbst.According to FIG. 1 there is a squeezing roller 1, 2 above and below the belt B. So that there is no rolling effect, the axes 1a, 2a of these squeezing rollers 1, 2 are slightly offset from one another in the strip running direction. In the tape running direction viewed behind the squeeze roller 1 there is a slot jet nozzle 3 which β a Casstrahl at an angle of between 45 o and 90 o inclined to the running direction L of the band B toward the band surface. The slot jet nozzle 3 is arranged at a distance h from the surface of the belt B. The gas jet emerging from it has the same width s as the slot of the nozzle 3 itself in the case of a non-widened nozzle opening in the region of the nozzle outlet opening.

Ein Saugspalt 4 ist im dargestellten Fall auf der einen Seite durch den entsprechend geformten Düsenkörper 5 und auf der anderen Seite durch die Abquetschrolle 1 gebildet.A suction gap 4 is in the case shown on the one Side formed by the correspondingly shaped nozzle body 5 and on the other side by the squeeze roller 1.

Die Unterseite 5a des Düsenkörpers 5 weist im Bereich zwischen dem Düsenspalt 3a und dem Saugspalt 4 eine Stufe 5b auf, welche dafür sorgt, daß der Düsenkörper 5 das Geschwindigkeitsfeld des Gasstrahls nicht beeinflußt. Auf diese Weise wirkt sich die volle Auftreffgeschwindigkeit des Gasstrahles bei der an der Bandoberfläche entstehenden Wandschubspannung aus. Die Schlitzdüse 3 wird von einem über die gesamte Bandbreite reichenden Versorgungskanal 5c versorgt.The underside 5a of the nozzle body 5 has a step 5b in the area between the nozzle gap 3a and the suction gap 4, which ensures that the nozzle body 5 does not influence the speed field of the gas jet. In this way, the full impact velocity of the gas jet has an effect on the wall shear stress arising on the belt surface. The slot nozzle 3 is supplied by a supply channel 5c which extends over the entire bandwidth.

Der Saugspalt 4 ist durch einen entsprechend schmalen Rechteckkanal über der gesamten Breite des Bandes B mit einem Absaugdrallrohr 6 verbunden. Von dem Absaugdrallrohr 6 wird der abzusaugende Volumenstrom zweckmäßigerweise zu beiden Seiten, also in der Darstellung sowohl nach vorne als auch nach hinten abgeführt. Bei kleineren Arbeitsbreiten kann auch die einseitige Ableitung des Saugstromes ausreichen. Die eingezeichneten Strömungspfeile verdeutlichen die Wirkung des Absaugdrallrohres 6.The suction gap 4 is connected to a suction swirl tube 6 by a correspondingly narrow rectangular channel over the entire width of the band B. The volume flow to be extracted is expediently discharged to both sides, that is to say both to the front and to the rear, from the suction swirl tube 6. With smaller working widths, the one-sided derivation of the suction flow can also be sufficient. The flow arrows shown illustrate the effect of the suction swirl tube 6.

Der Saugspalt 4 ist - abweichend von den aus Darstellungsgründen anderen Größenverhältnissen der schematischen Zeichnung - wesentlich größer bemessen als der Düsenspalt 3a, da zum einen die Absaugegeschwindigkeit wesentlich kleiner ist als die Ausblasegeschwindigkeit aus dem Düsenspalt 3a und zum anderen der abzusaugende Volumenstrom um den Anteil größer sein muß, der zusätzlich zu dem aus dem Düsenspalt austretenden Volumenstrom, z.B. an den Kanten des Bandes B angesaugt wird.The suction gap 4 is - in deviation from the different proportions of the schematic drawing for reasons of illustration - dimensioned much larger than the nozzle gap 3a, because on the one hand the suction speed is significantly lower than the blow-out speed from the nozzle gap 3a and on the other hand the volume flow to be suctioned is larger by the proportion must, in addition to the volume flow emerging from the nozzle gap, for example is sucked in at the edges of band B.

Bei einem Band B, das auf beiden Seiten getrocknet werden muß, was an Walzgerüsten üblicherweise der Fall ist, ist vor der unteren Abquetschrolle 2 eine gleichartige Einrichtung angeordnet, die in der Darstellung der Figur zur Vereinfachung weggelassen wurde.With a belt B, which has to be dried on both sides, which is usually the case on roll stands, is in front the lower squeeze roller 2 is arranged a similar device, which has been omitted in the illustration of the figure for simplicity.

Die Schlitzdüse 3 kann verschiedene Formen haben. Bei dem in Figur 2 vergrößert gezeigten Ausführungsbeispiel weist sie ein Erweiterungsteil 3b im Düsenspalt 3a, ähnlich einer Lavall-Düse, auf. Bei dieser Düse ist die Breite des Schlitzstrahls gleich der Breite s an der engsten Stelle der Schlitzdüse 3. Durch das Erweiterungsteil 3b wird erreicht, daß die Strömung über die Schallgeschwindigkeit hinaus beschleunigt wird und mit einer noch höheren Ankunftsgeschwindigkeit auf das Band B auftrifft. Auf diese Weise läßt sich mit verhältnismäßig einfachen Mitteln, nämlich nur durch eine entsprechende Gestaltung des Düsenspaltes 3a, die Abstreifwirkung des aus der Düse 3 austretenden Gasstrahls noch weiter steigern, ohne daß dazu der Düsendruck in unwirtschaftlicher Weise erhöht werden muß.The slot nozzle 3 can have different shapes. In the embodiment shown enlarged in FIG. 2, it has an extension part 3b in the nozzle gap 3a, similar to a Lavall nozzle. In this nozzle, the width of the slit jet is equal to the width s at the narrowest point of the slit nozzle 3. The extension part 3b means that the flow is accelerated beyond the speed of sound and strikes the belt B with an even higher arrival speed. In this way, the wiping effect of the gas jet emerging from the nozzle 3 can be increased even further with relatively simple means, namely only by an appropriate design of the nozzle gap 3a, without the nozzle pressure having to be increased in an uneconomical manner.

Claims (6)

Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines bewegten Bandes (B), insbesondere eines Walzbandes an einem Walzgerüst, mittels auf das bewegte Band (B) aufgeblasenen Gases, insbesondere Luft,
dadurch gekennzeichnet, - daß quer zur Bandlaufrichtung (L) eine Schlitzstrahldüse (3) angeordnet ist, die mit einer Neigung (β) von 45o bis 90o ihrer Strahlrichtung gegen die Bandlaufrichtung (L) auf die Bandoberfläche gerichtet ist, - daß das Verhältnis aus Düsenabstand (h) der Schlitzstrahldüse (3) von dem bewegten Band (B) zur Breite (s) des Schlitzes im Bereich h/s = 2 bis h/s = 10 liegt, so daß die Austrittsgeschwindigkeit des mit der Schlitzstrahldüse (3) auf das Band (B) aufgeblasenen Gasstrahls im Bereich von 0,3 < Mach < 2 liegt, und - daß in einem Abstand von 5 bis 25 Düsenabständen (h) in Laufrichtung (L) des Bandes (B) vor der Auftrefflinie des aus der Schlitzstrahldüse (3) austretenden Gasstrahles über dem Band (B) ein Absaugspalt (4) angeordnet ist. Device for removing liquid from the surface of a moving belt (B), in particular a rolling belt on a roll stand, by means of gas, in particular air, which is inflated onto the moving belt (B),
characterized, - That a slot jet nozzle (3) is arranged transversely to the tape running direction (L), which is directed at an inclination (β) of 45 o to 90 o of its jet direction against the tape running direction (L) onto the tape surface, - That the ratio of the nozzle spacing (h) of the slot jet nozzle (3) from the moving belt (B) to the width (s) of the slot is in the range h / s = 2 to h / s = 10, so that the exit velocity of the Slot jet nozzle (3) on the belt (B) inflated gas jet is in the range of 0.3 <Mach <2, and - That at a distance of 5 to 25 nozzle spacings (h) in the running direction (L) of the belt (B) before the line of impact of the gas jet emerging from the slot jet nozzle (3) above the belt (B) a suction gap (4) is arranged. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß der Absaugspalt (4) zum Absaugen des aufgeblasenen Gasstrahls mit einem Drallrohr (6) verbunden ist.Device according to claim 1,
characterized in that the Suction gap (4) for sucking off the inflated gas jet is connected to a swirl tube (6). Vorrichtung nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, daß eine Seitenwand des Absaugspaltes (4) von einer Abquetschrolle (1) gebildet ist.Device according to one of claims 1 or 2,
characterized in that a side wall of the suction gap (4) is formed by a squeeze roller (1). Vorrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß sowohl an der Oberseite als auch an der Unterseite des Bandes (B) Mittel zum Entfernen von Flüssigkeit angeordnet sind.Device according to one of claims 1 to 3,
characterized in that means for removing liquid are arranged both on the top and on the bottom of the belt (B). Vorrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß zwei gegeneinander geneigte Schlitzdüsen (3) hintereinander angeordnet sind und der Absaugspalt (4) sich zwischen den beiden Schlitzdüsen (3) befindet.Device according to one of claims 1 to 4,
characterized in that two slotted nozzles (3) inclined relative to one another are arranged one behind the other and the suction gap (4) is located between the two slotted nozzles (3). Vorrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß die Schlitzdüse (3) nach Art einer Lavall-Düse mit einem engstem Querschnitt und anschließendem Erweiterungsteil (3b) ausgebildet ist.Device according to one of claims 1 to 5,
characterized in that the slot nozzle (3) is designed in the manner of a Lavall nozzle with a narrowest cross-section and subsequent extension part (3b).
EP92107560A 1991-05-17 1992-05-05 Device for removing liquid from the surface of a moving strip Expired - Lifetime EP0513632B1 (en)

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DE4116325 1991-05-17
DE4116325 1991-05-17

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EP0513632B1 EP0513632B1 (en) 1995-07-19

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EP (1) EP0513632B1 (en)
JP (1) JP3431181B2 (en)
DE (2) DE59202907D1 (en)
ES (1) ES2077284T3 (en)

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EP0662359A1 (en) * 1994-01-08 1995-07-12 Sms Schloemann-Siemag Aktiengesellschaft Device for sealing without contact a gap on the outlet of a rolling stand
EP0679849A2 (en) * 1994-04-30 1995-11-02 Kabushiki Kaisha Seibu Giken Method and apparatus for dehydrating and drying a wet article
EP0679849A3 (en) * 1994-04-30 1996-04-03 Seibu Giken Kk Method and apparatus for dehydrating and drying a wet article.
EP0816786A1 (en) * 1996-06-25 1998-01-07 Eastman Kodak Company The effect of air baffle design on mottle in solvent coatings
DE19901845A1 (en) * 1999-01-19 2000-07-20 Voith Sulzer Papiertech Patent Water removal from the press rollers at the press station for a wet fiber web has compressed air jet(s) aligned at the roller surface and a guide to deflect the reflected water and air to a catch unit and trough to carry the water away
EP1070927A2 (en) * 1999-07-22 2001-01-24 Systronic Maschinenbau GmbH Continuous dryer for plates or webs
EP1070927A3 (en) * 1999-07-22 2001-03-14 Systronic Maschinenbau GmbH Continuous dryer for plates or webs
EP1092934A1 (en) * 1999-10-12 2001-04-18 Lenhardt Maschinenbau GmbH Device for drying cleaned glass plates
EP1775034A1 (en) * 2004-08-05 2007-04-18 Kabushiki Kaisha Kobe Seiko Sho Deposit removing device
EP1775034A4 (en) * 2004-08-05 2008-08-06 Kobe Steel Ltd Deposit removing device
US8499410B2 (en) 2004-08-05 2013-08-06 Kobe Steel, Ltd. Deposit removing device
US9016230B2 (en) 2009-05-13 2015-04-28 Atotech Deutschland Gmbh Method and assembly for treating a planar material to be treated and device for removing or holding off treatment liquid
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WO2010133219A3 (en) * 2009-05-22 2011-07-14 Huebel Egon Method and device for the wet treatment of flat material
WO2011003664A1 (en) * 2009-07-10 2011-01-13 Bernd Berger Device for removing residues from the surface of a moving strip, and strip processing system
EP2735381A1 (en) * 2012-11-22 2014-05-28 Shinko Co., Ltd. Dust-removing apparatus
CN103831274A (en) * 2012-11-22 2014-06-04 株式会社伸兴 Dust-removing apparatus
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Also Published As

Publication number Publication date
JP3431181B2 (en) 2003-07-28
US5313685A (en) 1994-05-24
ES2077284T3 (en) 1995-11-16
EP0513632B1 (en) 1995-07-19
DE59202907D1 (en) 1995-08-24
DE4215602A1 (en) 1992-11-19
JPH05200374A (en) 1993-08-10
DE4215602C2 (en) 1995-09-28

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