EP0513632B1 - 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 PDFInfo
- Publication number
- EP0513632B1 EP0513632B1 EP92107560A EP92107560A EP0513632B1 EP 0513632 B1 EP0513632 B1 EP 0513632B1 EP 92107560 A EP92107560 A EP 92107560A EP 92107560 A EP92107560 A EP 92107560A EP 0513632 B1 EP0513632 B1 EP 0513632B1
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- EP
- European Patent Office
- Prior art keywords
- strip
- slot
- nozzle
- gap
- jet
- 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.)
- Expired - Lifetime
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Classifications
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- 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
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- 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
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- 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 strip conveyed from a strip processing machine, in particular a roll stand.
- 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 reeled 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 reeling. 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 gas 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 off uniformly 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 flow 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 belt that has already been blown off.
- 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 considerably 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. This ensures 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 slot jet nozzle makes it possible to achieve the speeds of 300 m / s or more required for removing 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 to clean the metal strip.
- the invention can be implemented with or without squeeze rollers arranged upstream in the tape running direction. If there are no squeezing rollers or the device for removing rolling oil or rolling emulsion has to be arranged at a greater distance from the squeezing 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 must be dimensioned such that the gas streams inflated onto the belt by both slot nozzles, including the liquid, are captured by the suction.
- the required impact velocity 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 aspects, 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 directs a gas jet at an angle ⁇ between 45 ° and 90 ° against the direction of travel L of the tape B onto the tape 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 gap 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 Page 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 by a correspondingly narrow rectangular channel over the entire width of the band B to a suction swirl tube 6.
- the volume flow to be extracted is expediently discharged from the suction swirl tube 6 to both sides, that is to say both to the front and to the rear in the illustration. 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 the band B.
- the slot nozzle 3 can have different shapes. In the exemplary 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 thickness of the slit jet is equal to the gap 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 at 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.
Description
Die Erfindung betrifft eine Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines aus einer Bandbearbeitungsmaschine, insbesondere einem Walzgerüst, geförderten Bandes.The invention relates to a device for removing liquid from the surface of a strip conveyed from a strip processing machine, in particular a roll stand.
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 reeled 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 reeling. 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, Rückstände, die nach einer Behandlung eines Bandes auf diesem verbleiben, von dem Band durch Abblasen zu entfernen. So ist aus der amerikanischen Patentschrift US-PS-3 607 366 eine Vorrichtung der eingangs genannten Art bekannt, bei der Schlitzstrahldüsen mit einer Neigung von 45° bis 90° ihrer Strahlrichtung gegen die Bandlaufrichtung ausgerichtet sind und sich im wesentlichen über die Breite des Bandes erstrecken. Dabei sind die Düsen in einem Abstand von dem Band angeordnet, der bezogen auf die in Laufrichtung des Bandes gemessene Spaltweite der Schlitzdüse in einem Verhältnisbereich liegt, dessen untere Grenze 1,7 und dessen obere Grenze 50 beträgt. Die mit der bekannten Vorrichtung erzielbare Reinigungswirkung reicht jedoch nicht aus, um insbesondere in Walzgerüsten bearbeitete Walzbänder vollständig von den nach jedem Walzvorgang auf ihnen verbleibenden Schmiermittelresten zu befreien.Attempts have been made for a long time to remove residues that remain on a tape after treatment by blowing it off. For example, from the American patent specification US Pat. No. 3,607,366 there is a device at the beginning Known type known, are aligned in the slot jet nozzles with an inclination of 45 ° to 90 ° of their jet direction against the tape running direction and extend substantially across the width of the belt. The nozzles are arranged at a distance from the belt, which is in a ratio range with respect to the gap width of the slot nozzle measured in the running direction of the belt, the lower limit of which is 1.7 and the upper limit of which is 50. However, the cleaning effect that can be achieved with the known device is not sufficient to completely free the strip of lubricant remaining on them after each rolling process, in particular in the rolling stands.
Wegen dieser Schwierigkeiten bei bekannten Abblasesystemen werden an modernen Walzgerüsten fast ausschließlich mechanisch abstreifende Systeme verwendet. Diese mechanisch abstreifenden Systeme bestehen aus zwei hintereinandergeschalteten 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 mechanical stripping systems consist of two rubber lips connected in series, which are 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 erfindungsgemäß gelöst durch eine Vorrichtung zum Entfernen von Flüssigkeit von der Oberfläche eines aus einer Bandbearbeitungsmaschine, insbesondere einem Walzgerüst, geförderten Bandes, die eine sich im wesentlichen über die gesamte Breite des Bandes erstreckende Schlitzstrahldüse aufweist, über die zum Entfernen der Flüssigkeit ein Gasstrahl, dessen Austrittsgeschwindigkeit beim Verlassen der Schlitzstrahldüse in einem Bereich von 0.3 bis 2 Mach liegt, in einem Winkel von 45 - 90° auf die Oberfläche des Bandes entgegen der Laufrichtung des Bandes geblasen wird und welche in einem Abstand h von dem Band entfernt angeordnet ist, der so bemessen ist, daß das Verhältnis aus dem Abstand h der Schlitzstrahldüse von dem Band zu der Spaltweite s der Schlitzstrahldüse in einem Bereich von h/s = 2 bis h/s = 10 liegt, und bei der in Laufrichtung des Bandes vor der Auftrefflinie, an der der Gasstrahl auf das Band trifft, ein Absaugspalt ausgebildet ist, dessen Abstand zu der Auftrefflinie des Gasstrahls dem 5 bis 25fachen des Abstandes h der Schlitzstrahldüse von dem Band entspricht, wobei der über den Absaugspalt abgesaugte Volumenstrom auf den aus der Schlitzstrahldüse austretenden Gasvolumenstrom abgestimmt ist.This object is achieved according to the invention by a device for removing liquid from the surface of a strip conveyed from a strip processing machine, in particular a roll stand, which has a slot jet nozzle which extends essentially over the entire width of the strip and via which a gas jet is used to remove the liquid , the exit speed of which when leaving the slit jet nozzle is in a range from 0.3 to 2 Mach, at an angle of 45-90 ° to the surface of the belt against the direction of travel of the belt is blown and which is arranged at a distance h from the band, which is dimensioned such that the ratio of the distance h of the slot jet nozzle from the band to the gap width s of the slot jet nozzle in a range of h / s = 2 to h / s = 10, and a suction gap is formed in the direction of travel of the belt in front of the impact line at which the gas jet hits the belt, the distance from the line of impact of the gas jet corresponding to 5 to 25 times the distance h of the slot jet nozzle from the belt , wherein the volume flow sucked through the suction gap is matched to the gas volume flow emerging from the slit jet nozzle.
Bei dieser Lösung wird mit einem strömungstechnisch optimal ausgelegten Gasstrahl 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 gas 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 off uniformly 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 flow 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 belt that has already been blown off.
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 considerably 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. This ensures 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 slot jet nozzle makes it possible to achieve the speeds of 300 m / s or more required for removing 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 to clean 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 tape running direction. If there are no squeezing rollers or the device for removing rolling oil or rolling emulsion has to be arranged at a greater distance from the squeezing 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 must be dimensioned such that the gas streams inflated onto the belt by both 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 impact velocity 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 aspects, 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.
- 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 Gasstrahl unter einem Winkel β zwischen 45° und 90° 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 Spaltweite s wie der Schlitz der Düse 3 selbst.According to FIG. 1 there is a
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 Page formed by the correspondingly
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
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 by a correspondingly narrow rectangular channel over the entire width of the band B to a
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 the 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.For a belt B, which has to be dried on both sides, which is usually the case on roll stands, is in front the
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 Dicke des Schlitzstrahls gleich der Spaltweite 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
Claims (6)
- A device for removing liquid from the surface of a strip (B) conveyed from a strip-processing machine, more particularly a roll stand, the device having a slot jet nozzle (3) which extends over substantially the whole width of the strip (B) and via which for the removal of the liquid a gas jet, whose velocity of emergence on leaving the slot jet nozzle (3) in a range of 0.3 to 2 Mach, is blown at an angle of 45 - 90° on to the surface of the strip (B) contrary to the running direction (L) of the strip (B) and which is disposed at a distance h from the strip (B) such that the ratio between the distance h of the slot jet nozzle (3) from the strip (B) and the gap width s of the slot jet nozzle (3) is in a range h/s = 2 to h/s = 10 and wherein provided in the running direction of the strip upstream of the line of infringement at which the gas jet impinges on the strip (B), is a suctional removal gap (4) whose distance from the line of infringement of the gas jet is 5 to 25 times the distance h between the slot jet nozzle (3) and the strip (B), the volumetric flow removed by suction via the suctional gap (4) being harmonized with the volumetric gas flow emerging from the slot jet nozzle (3).
- A device according to claim 1, characterized in that the suctional removal gap (4) for removing the blown-on gas jet by suction is connected to a swirl tube (6).
- A device according to one of claims 1 or 2, characterized in that one side wall of the suctional removal gap (4) is formed by a squeeze roll (1).
- A device according to one of claims 1 to 3, characterized in that the device is so constructed that liquid is removed on both the top and bottom sides of the strip (B).
- A device according to one of claims 1 to 4, characterized in that two slot nozzles (3) inclined oppositely to one another are disposed one after the other, the suctional removal gap (4) being disposed between the two slot nozzles (3).
- A device according to one of claims 1 to 5, characterized in that the slot nozzle (3) is constructed after the fashion of a Lavall nozzle, with a very narrow cross-section followed by widened portion (3b).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4116325 | 1991-05-17 | ||
| DE4116325 | 1991-05-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0513632A1 EP0513632A1 (en) | 1992-11-19 |
| EP0513632B1 true EP0513632B1 (en) | 1995-07-19 |
Family
ID=6431958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92107560A Expired - Lifetime EP0513632B1 (en) | 1991-05-17 | 1992-05-05 | Device for removing liquid from the surface of a moving strip |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5313685A (en) |
| EP (1) | EP0513632B1 (en) |
| JP (1) | JP3431181B2 (en) |
| DE (2) | DE59202907D1 (en) |
| ES (1) | ES2077284T3 (en) |
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| US5849098A (en) * | 1992-08-01 | 1998-12-15 | Volkmann; Thilo | Process and device for the reduction of the amount of liquids remaining on flat stock after a rolling process |
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| DE4422422A1 (en) * | 1994-01-08 | 1995-07-13 | Schloemann Siemag Ag | Appts. for contactless sealing of gap at the exit of a rolling stand, |
| US5490300A (en) * | 1994-04-25 | 1996-02-13 | Horn; Paul E. | Air amplifier web cleaning system |
| KR100369200B1 (en) * | 1994-04-30 | 2003-03-26 | 가부시키가이샤 세이부 기켄 | Method of low temperature rapid dehydration drying by high speed fluid |
| EP0789635B1 (en) * | 1994-09-06 | 1999-08-11 | Patent Consulting & Development GmbH | Method and apparatus for removing dust particles from a relatively moving material web |
| DE19519544C2 (en) * | 1995-05-27 | 1999-08-19 | Sundwig Gmbh | Device for removing liquid from the surface of a tape |
| ES2169805T3 (en) * | 1996-06-24 | 2002-07-16 | Sundwig Gmbh | DEVICE FOR ELIMINATING LIQUID FROM THE SURFACE OF A BAND. |
| US6018886A (en) * | 1996-06-25 | 2000-02-01 | Eastman Kodak Company | Effect of air baffle design on mottle in solvent coatings |
| FI104099B (en) * | 1996-10-25 | 1999-11-15 | Valmet Corp | Method and apparatus for removing dust from a paper machine or the like or a post-treatment device thereof |
| US6148831A (en) * | 1996-10-25 | 2000-11-21 | Valmet Corporation | Method for cleaning a web |
| US5991964A (en) | 1998-06-22 | 1999-11-30 | Kimberly-Clark Worldwide, Inc. | Web cleaner |
| 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 |
| DE19908743A1 (en) * | 1999-03-01 | 2000-09-07 | Sms Demag Ag | Method and device for drying and keeping dry, in particular, cold strip in the outlet area of cold rolling and strip systems |
| DE19934487B4 (en) * | 1999-07-22 | 2004-04-29 | Systronic Systemlösungen für die Elektronikindustrie GmbH | Continuous dryer for panels or webs |
| DE19949268C2 (en) * | 1999-10-12 | 2001-09-13 | Lenhardt Maschinenbau | Device for drying washed glass sheets |
| DE10225753B4 (en) * | 2002-06-10 | 2009-08-13 | Duo Technik Gmbh | drying device |
| US6842996B2 (en) * | 2002-08-31 | 2005-01-18 | Day International, Inc. | Segmented air distribution bar |
| ITMI20030273A1 (en) * | 2003-02-14 | 2004-08-15 | Percivalle Special Converting S A S Di Percivall | DEVICE AND METHOD FOR HEAT TREATMENT OF A |
| EP1516677A1 (en) | 2003-09-17 | 2005-03-23 | Varn Products Company, Inc. | Segmented air distribution bar |
| JP4451194B2 (en) * | 2004-04-13 | 2010-04-14 | 三菱日立製鉄機械株式会社 | Liquid wiping device |
| WO2006013848A1 (en) | 2004-08-05 | 2006-02-09 | Kabushiki Kaisha Kobe Seiko Sho | Deposit removing device |
| DE102004051047A1 (en) * | 2004-10-19 | 2006-04-27 | Loi Thermprocess Gmbh | Method and device for quenching steel flat products |
| DE102004060086A1 (en) | 2004-12-14 | 2006-06-22 | Sms Demag Ag | Method and device for strip blowing in the outlet of rolling mills for the production of drip-free and clean rolled strip |
| DE102005039474A1 (en) * | 2005-08-20 | 2007-02-22 | Sms Demag Ag | rolling plant |
| DE102008058513B4 (en) | 2008-11-21 | 2011-03-10 | Berger, Bernd, Dr.-Ing. | Device for removing liquid from the surface of a moving belt and belt processing plant with such a device |
| BRPI1011369A2 (en) | 2009-05-13 | 2016-03-15 | Atotech Deutschland Gmbh | method, treatment plant and assembly for treating a flat material to be treated |
| DE102009023766A1 (en) * | 2009-05-22 | 2010-11-25 | Hübel, Egon, Dipl.-Ing. (FH) | Method and device for wet treatment of flat goods |
| DE102009032907B3 (en) * | 2009-07-10 | 2010-11-04 | Berger, Bernd, Dr.-Ing. | Apparatus for removing residues from the surface of a moving belt and a belt processing system |
| US20110155707A1 (en) * | 2009-12-31 | 2011-06-30 | Du Pont Apollo Limited | Laser scribing apparatus and process for solar panel |
| DE102011001639A1 (en) * | 2011-03-29 | 2012-10-04 | Turbofilter Gmbh | Device for cleaning the surface of moving material webs |
| JP5814902B2 (en) * | 2012-11-22 | 2015-11-17 | 株式会社伸興 | Dust remover |
| CN103292585B (en) * | 2013-05-31 | 2015-02-25 | 湖南省金为型材有限公司 | Pipe dryer |
| US9908158B2 (en) | 2014-03-10 | 2018-03-06 | Ametek, Inc. | Air flow mechanism for image capture and vision systems |
| DE102014222530A1 (en) | 2014-05-05 | 2015-11-05 | Sms Group Gmbh | Band deflector and roller assembly |
| KR101583617B1 (en) * | 2014-07-16 | 2016-01-11 | 주식회사 삼우에코 | Induced fluid nozzle of strip surface |
| CN105107853A (en) * | 2015-09-10 | 2015-12-02 | 武汉科技大学 | Strip steel surface emulsified liquid sweeping device |
| WO2017077291A1 (en) * | 2015-11-03 | 2017-05-11 | Peter Philip Andrew Lymn | Liquid removal |
| EP3444381B1 (en) * | 2016-03-29 | 2021-07-21 | Nippon Steel Corporation | Liquid removal apparatus and liquid removal method |
| KR20180060325A (en) * | 2016-11-28 | 2018-06-07 | 엘지디스플레이 주식회사 | Roll to roll fabrication apparatus |
| CN109396199A (en) * | 2017-08-17 | 2019-03-01 | Posco公司 | Oxide skin discharger |
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| DE3507936C2 (en) * | 1985-03-06 | 1996-02-01 | Josef Froehling Gmbh Walzwerks | Process for removing films of superplasticizer adhering to a belt moved in translation and device for carrying out the process |
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| JPH01232236A (en) * | 1988-03-11 | 1989-09-18 | Mitsuboshi Belting Ltd | Bearing run testing machine |
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- 1992-05-05 DE DE59202907T patent/DE59202907D1/en not_active Expired - Fee Related
- 1992-05-05 ES ES92107560T patent/ES2077284T3/en not_active Expired - Lifetime
- 1992-05-05 EP EP92107560A patent/EP0513632B1/en not_active Expired - Lifetime
- 1992-05-06 US US07/880,204 patent/US5313685A/en not_active Expired - Fee Related
- 1992-05-12 DE DE4215602A patent/DE4215602C2/en not_active Expired - Fee Related
- 1992-05-15 JP JP12371392A patent/JP3431181B2/en not_active Expired - Fee Related
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| Title |
|---|
| JP-A-1 123 236 (KONICA CORP.) 16. Mai 1989 & PATENT ABSTRACTS OF JAPAN vol. 13, no. 363 (P-918)(3711) 14. August 1989 * |
| JP-A-62 132 567 (KOBE STEEL) 15. Juni 1987 & PATENT ABSTRACTS OF JAPAN vol. 11, no. 361 (C-459)(2808) 25. November 1987 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4215602C2 (en) | 1995-09-28 |
| JPH05200374A (en) | 1993-08-10 |
| DE59202907D1 (en) | 1995-08-24 |
| JP3431181B2 (en) | 2003-07-28 |
| EP0513632A1 (en) | 1992-11-19 |
| ES2077284T3 (en) | 1995-11-16 |
| US5313685A (en) | 1994-05-24 |
| DE4215602A1 (en) | 1992-11-19 |
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