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EP1699721B2 - Device for suspended guidance of strip-like materials - Google Patents

Device for suspended guidance of strip-like materials Download PDF

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Publication number
EP1699721B2
EP1699721B2 EP04797984A EP04797984A EP1699721B2 EP 1699721 B2 EP1699721 B2 EP 1699721B2 EP 04797984 A EP04797984 A EP 04797984A EP 04797984 A EP04797984 A EP 04797984A EP 1699721 B2 EP1699721 B2 EP 1699721B2
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EP
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Prior art keywords
web
gas
strip
nozzle
flow
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Expired - Lifetime
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EP04797984A
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German (de)
French (fr)
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EP1699721A1 (en
EP1699721B1 (en
Inventor
Klaus Schmitz
Manfred Kolle
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Otto Junker GmbH
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Otto Junker GmbH
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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
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web

Definitions

  • the invention relates to a device for the floating guidance of sheet-like material, in particular of metal strips, by means of a gas having at least one unit, in each of which a surface of the float nozzle with nozzle ribs, from which the gas flows onto the sheet-like material, is arranged on both surfaces of the sheet material , and each floating nozzle field is fed by a radial fan associated therewith, which is laterally offset in a volute to the respective floating nozzle field with respect to the sheet material, via a flow channel system with gas, both centrifugal fans in the unit on the with respect to the sheet material same side are arranged.
  • Each centrifugal fan blows in a direction parallel to the transport direction of the metal strip flow channel, which merges after double deflection at the respective end face of the device in a parallel channel section with opposite flow direction.
  • the blow-by gas flows, after a further deflection, into the nozzle ribs of the respective floating door panel on the rear side thereof.
  • the invention is therefore an object of the invention to provide a device for floating guiding of web-like material, the one has simplified flow guidance and thus allows, inter alia, the integration of heating or cooling elements in the flow channel system.
  • the two gas flows are deflected only twice by about 90 °, so that the flow channel systems consist of a few simple, straight channel sections in which easily heating or cooling elements for the purpose of heat treatment or cooling of the web-like Have the material installed.
  • the type of flow guidance according to the invention also makes possible an optimized utilization of the space available in the device, which ultimately allows a more compact system design, which is less susceptible to thermally induced distortion.
  • the web-like material is guided horizontally through the device, so that the floating nozzle fields are arranged above and below the web-shaped material. Due to the separate controllability of the gas streams through the separately provided for the upper and lower floating nozzle jet radial fans while the carrying capacity of the band leading total gas flow can be adjusted very precisely.
  • the device according to the invention in principle also allows a vertical or any desired oblique or curved guide of the sheet material.
  • the spiral casings are shaped in such a way that the gas streams emerging from the spiral casings expand in a plane perpendicular to the surface of the web-shaped material up to the entire length of the floating nozzle fields.
  • a divergent gas flow which can be realized only in the flow guides according to the invention, in which the gas flows in a plane perpendicular to the surface of the sheet material from the volute, realizes a particularly uniform distribution of the gas to the individual nozzle ribs, and consequently also the arranged at the ends of the floating nozzle field nozzle ribs are supplied with the same volume flow as lying at the level of the respective centrifugal fan.
  • the uniformity of the gas flow ie an approximately identical and temporally constant volume flow in each nozzle rib, can be decisively further improved by the spiral housing each having a curved Strömungsleitblech, which halves the gas flow generated by the respective centrifugal fan substantially.
  • the gas flow is already in Spiral housing divided into two sub-streams, which each supply a group of nozzle ribs.
  • a longitudinal direction of the device i. in the transport direction of the web material, extremely space-saving arrangement of the two spiral housings can be achieved in that they are aligned point-symmetrically with respect to the center of the connecting line of the radial fan axes. Also perpendicular to the space requirement of both spiral housing can be further reduced by both radial fan axes are arranged in a direction parallel to the transport direction of the sheet material extending line.
  • the device for the purpose of heat treatment of the web-shaped material at least one heating element for heating the gas.
  • the device according to the invention can be expanded without great constructive effort to a strip float furnace.
  • the device may also be equipped with cooling elements that allow a controlled cooling of the guided through the device band.
  • the heat transfer from the heating element to the web-shaped material is convective, ie by the release of heat to the gas flowing around the heating element, which in turn flows around the web-like material and thereby heats up.
  • the heating element can be designed as a heating tube heated by combustion gases from the inside or else as an electric heating element, it being advantageous from a constructional point of view to arrange it in the device in such a way that it extends transversely to the transport direction of the sheet material and parallel to its surface.
  • it is also useful to increase the effective heat transfer surface of the heating tube for example by the heating tube additionally has a heating loop at its end projecting into the device, in a plan view, for example, p-shaped is.
  • a multi-level guidance or treatment of the sheet-like material can be achieved in that the device according to the invention consists of a plurality of units arranged one behind the other in the direction of transport of the sheet material. If a heat treatment of the web-shaped material is provided in such a system, then at least one of the units is equipped with at least one heating element, which may be formed in the manner described above, for example as a heating tube. If the sheet-like material to be cooled again after heating, it may be provided accordingly that the unit following the heating unit is equipped with cooling elements for controlled cooling of the sheet material.
  • the in the FIG. 1 illustrated device for the floating guidance and heat treatment of metal strip comprises a cuboid housing 1 with an inlet slot 1a and an outlet slot 1b, through which the metal strip B to be treated is guided into or out of the device.
  • the metal strip B is acted upon by an upper and a lower nozzle array 2, 3 with gas and thus guided floating.
  • the nozzle fields 2, 3 each comprise a number of nozzle ribs 2a, 3a, from which the gas flows onto the belt B, and each arranged between two nozzle ribs 2a, 3a outflow channels 2b, 3b, via which the gas flows reflected at the belt surfaces in a Suction chamber 4 flow out again.
  • the cuboid suction chamber 4 is in the view of FIG. 1 arranged behind the floating nozzle fields and extends over the entire length of the device.
  • the metal strip B suspended by the device is heat-treated at the same time.
  • 3 three heating elements 7, 8 are arranged, which the gas streams before entering the nozzle ribs heat, as will be described in more detail below.
  • the upper and the lower floating nozzle field 2, 3 is associated with a respective radial fan 5, 6, wherein the radial fan 5, the upper and the centrifugal fan 6, the lower floating nozzle field 2, 3 feeds.
  • Both centrifugal fans are positioned with respect to the metal strip B on the same side of the device (see FIG. 2 ) and are each driven by a separate motor, not shown.
  • the radial fans 5, 6 are further arranged in spiral housings 5a, 6a, which are aligned such that the gas flows generated by the radial fans 5, 6 in a plane perpendicular to the surface of the metal strip B from the volute casings 5a, 6a exit.
  • spiral housings 5a, 6a are shaped in such a way that the gas streams emerging from them expand up to the entire length of the floating nozzle fields 2, 3.
  • Such a divergent gas flow allows a particularly uniform distribution of the gas to the individual nozzle ribs, so that consequently the arranged at the ends of the floating nozzle fields 2, 3 nozzle ribs 2a, 3a are supplied with the same volume flow, as at the level of the radial fans 5, 6th lying.
  • a curved flow baffle 5b, 6b is provided within the spiral housing 5a, 6a, which in each case generates the flow baffle 5, 6 produced by the respective radial fan 5, 6 FIG. 3 Halved essentially with gas streams represented by arrows. This also contributes to a homogenization of the gas flows.
  • the relatively bulky volute casing 5a, 6a can nevertheless be arranged to save space with respect to length and height of the device at one longitudinal wall.
  • they are preferably aligned point-symmetrically with respect to the center of the connecting line of the centrifugal fan axes.
  • both radial fan axes are preferably arranged on a line running parallel to the transport direction of the web material.
  • the spiral housings 5a, 6a are part of two U-shaped flow channel systems S1, S2, via which the gas streams generated by the centrifugal fans 5, 6 pass into the nozzle ribs 2a, 3a of the floating nozzle fields 2, 3.
  • the gas streams initially emerge from the spiral casings 5a, 6a in a plane perpendicular to the surface of the sheet-like material and then flow through the nozzle ribs 2a, 3a of the floating nozzle fields 2, 3 by twice about 90 ° each their respective rear side.
  • the U-shaped flow channel systems S1, S2 are bounded on the outside by the housing wall 1 and on the inside by the wall of the suction chamber 4.
  • the gas streams flow horizontally and transversely to the transport direction of the metal strip B, wherein they flow around the heating elements 7, 8 arranged both above and below the floating nozzle fields 2, 3.
  • the heating elements 7, 8 are preferably formed as by combustion gases from inside heated heating tube, which extend transversely to the transport direction of the belt B and parallel to its surface.
  • the heating elements 7, 8 additionally each have a heating loop at their ends projecting into the device, so that they, as in FIG FIG. 4 represented, are formed in plan view p-shaped.
  • the gas streams heated by the heating elements 7, 8 flow into the nozzle ribs 2 a, 3 a of the floating nozzle fields 2, 3 via their respective rearward side and finally to the strip surface via nozzles (not shown) provided in the nozzle ribs 2 a, 3 a.
  • the gas streams are reflected in the outflow channels 2b, 3b, from where they enter through openings 4b provided in the side wall of the suction chamber 4 in these.
  • the gas collected in the suction chamber is in turn sucked in via the intake 4 a of the centrifugal fans 5, 6 and accelerated again.
  • FIGS. 1 to 4 illustrated device consists of a unit. It is understood that for the purpose of a controlled heat treatment and cooling several of the units described above can be arranged one behind the other, wherein at least one of the units is equipped with the above-described heating elements 7, 8 and preferably a further unit, in particular immediately following the heating unit, equipped with cooling elements.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Furnace Details (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Advancing Webs (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention relates to a device for suspended guidance of strip-like material (B), in particular metal strips, by means of a gas with at least one unit, in which suspending jet fields (2, 3) with nozzle bars (2a, 3a), are arranged facing both surfaces of the strip-like material (B), from which the gas flows onto the strip-like material (B) and each suspending jet field (2, 3) is supplied with gas from a provided radial fan (5, 6), laterally displaced from said suspending nozzle field (2, 3) with relation to the strip-like material (B), arranged in a spiral housing (2a, 3a) through a flow channel system (S1, S2), whereby both radial fans (5, 6) in the unit are arranged on the same side with relation to the strip-like material. Said device is characterized in that the flow channel system (S1, S2) has a U-shaped profile, viewed in the transport direction of the strip-like material, such that the gas flows, generated by the radial fans (5, 6), exit from the spiral housings (5a, 6a) in a plane perpendicular to the surface of the strip-like material (B) and then, by double diversion about ca. 90 DEG each time, flow into the nozzle bars (2a, 3a) of the suspending jet fields (2, 3) at the rear side thereof.

Description

Die Erfindung betrifft eine Vorrichtung zur schwebenden Führung von bahnförmigem Material, insbesondere von Metallbändern, mittels eines Gases mit mindestens einer Einheit, in der zu beiden Oberflächen des bahnförmigen Materials jeweils ein Schwebedüsenfeld mit Düsenrippen, aus welchen das Gas auf das bahnförmige Material aufströmt, angeordnet ist, und jedes Schwebedüsenfeld von einem ihm zugeordneten Radialventilator, der zum jeweiligen Schwebedüsenfeld in bezug auf das bahnförmige Material seitlich versetzt in einem Spiralgehäuse angeordnet ist, über ein Strömungskanalsystem mit Gas gespeist wird, wobei beide Radialventilatoren in der Einheit auf der in bezug auf das bahnförmige Material gleichen Seite angeordnet sind.The invention relates to a device for the floating guidance of sheet-like material, in particular of metal strips, by means of a gas having at least one unit, in each of which a surface of the float nozzle with nozzle ribs, from which the gas flows onto the sheet-like material, is arranged on both surfaces of the sheet material , and each floating nozzle field is fed by a radial fan associated therewith, which is laterally offset in a volute to the respective floating nozzle field with respect to the sheet material, via a flow channel system with gas, both centrifugal fans in the unit on the with respect to the sheet material same side are arranged.

Vorrichtungen dieser Art sind aus dem Stand der Technik bekannt. In dem Artikel "Gasbeheizte Durchlaufanlagen zur Wärmebehandlung schwebend geführter Metallbänder aus Kupferlegierungen - neue Entwicklungen und Zukunftsperspektiven" (GASMÄRME International (52) Nr. 7/2003) ist eine Vorrichtung zur beidseitigen Beblasung eines Metallbandes beschrieben, bei welcher die in einem Behandlungsraum zu beiden Flächen des Bandes angeordneten, aus einzelnen Düsenrippen bestehenden Schwebedüsenfelder jeweils durch einen Radialventilator mit einem Beblasungsgas gespeist werden. Dabei sind die Radialventilatoren zum Metallband seitlich versetzt auf einer Seite der Vorrichtung in zueinander punktsymmetrisch ausgerichteten Spiralgehäusen angeordnet. Jeder Radialventilator bläst in einen parallel zur Transportrichtung des Metallbandes verlaufenden Strömungskanal aus, welcher nach zweifacher Umlenkung am jeweiligen stirnseitigen Ende der Vorrichtung in einen parallelen Kanalabschnitt mit entgegengesetzter Strömungsrichtung übergeht. Aus diesem Kanalabschnitt strömt das Beblasungsgas nach einer weiteren Umlenkung in die Düsenrippen des jeweiligen Schwebedtisenteldes auf deren rückwärtiger Seite ein.Devices of this type are known from the prior art. The article "Gas-fired continuous systems for the heat treatment of suspended copper alloy strips - new developments and future prospects" (GASMÄRME International (52) Nr. 7/2003) describes a device for double-sided blowing of a metal strip, which in a treatment room to both surfaces arranged the belt, consisting of individual nozzle ribs floating nozzle fields are each fed by a centrifugal fan with a Beblasungsgas. The centrifugal fans are laterally offset to the metal strip on one side of the device in each other point-symmetrically aligned spiral housings arranged. Each centrifugal fan blows in a direction parallel to the transport direction of the metal strip flow channel, which merges after double deflection at the respective end face of the device in a parallel channel section with opposite flow direction. For this channel section, the blow-by gas flows, after a further deflection, into the nozzle ribs of the respective floating door panel on the rear side thereof.

Der Vorteil dieser Vorrichtung gegenüber solchen Vorrichtungen mit nur einem, beide Schwebedüsenfelder mit Beblasungsgas versorgenden Radialventilator, wie sie z.B. aus der DE 22 45 960 A1 bekannt sind, besteht darin, dass sie eine getrennte Regelung der auf das bahnförmige Material von oben bzw. unten aufströmenden Gasströme und damit eine exakte Einstellung der Tragkraft erlauben. Nachteilig ist jedoch die verwinkelte Strömungsführung der Gasströme, welche aufwendig gestaltete Strömungskanalsysteme erfordert und zudem nur sehr begrenzt Raum für eine Installation von Heizelementen in den Strömungskanälen bietet. Eine Integration der Heizelemente in den Saugraum der Vorrichtung hat wiederum den Nachteil, dass diese von dem durch die Radialventilatoren angesaugten, infolge des großen Querschnittes nur sehr langsam strömenden Gas umströmt werden, was die gewünschte direkte Wärmeübertragung von den Heizelementen auf das Beblasungsgas und damit eine konvektive Wärmeübertragung auf das Metallband erschwert.The advantage of this device over such devices with only one, both floating nozzle fields with Beblasungsgas supplying radial fan, as for example from the DE 22 45 960 A1 are known, is that they allow a separate control of the material flowing from the top or bottom of the web material flowing gas streams and thus an exact adjustment of the load capacity. However, a disadvantage is the angled flow guidance of the gas streams, which requires elaborately designed flow channel systems and also offers only very limited space for installation of heating elements in the flow channels. An integration of the heating elements in the suction chamber of the device in turn has the disadvantage that they are sucked by the sucked by the centrifugal fans, due to the large cross section only very slowly flowing gas, resulting in the desired direct heat transfer from the heating elements to the Beblasungsgas and thus a convective Heat transfer to the metal band difficult.

Von diesem Stand der Technik ausgehend liegt der Erfindung daher die Aufgabe zugrunde, eine Vorrichtung zum schwebenden Führen von bahnförmigem Material zu schaffen, die eine vereinfachte Strömungsführung aufweist und somit u.a. die Integration von Heiz- oder Kühlelementen in das Strömungskanalsystem erlaubt.Based on this prior art, the invention is therefore an object of the invention to provide a device for floating guiding of web-like material, the one has simplified flow guidance and thus allows, inter alia, the integration of heating or cooling elements in the flow channel system.

Die Aufgabe wird erfingdungsgemäß mit einer vorrichtung mit allen Merkmalen von Patentanspruch 1 gelöst.The object is achieved according to the invention with a device having all the features of claim 1.

Durch die sehr einfach gestaltete Strömungsführung der erfindungsgemäßen Vorrichtung werden die beiden Gasströme lediglich zweifach um ca. 90° umgelenkt, so dass die Strömungskanalsysteme aus wenigen einfachen, geradlinigen Kanalabschnitten bestehen, in denen sich leicht Heiz- oder Kühlelemente zum Zwecke der Wärmebehandlung oder Kühlung des bahnförmigen Materials installieren lassen. Die erfindungsgemäße Art der Strömungsführung ermöglicht zudem eine optimierte Ausnutzung des in der Vorrichtung zur Verfügung stehenden Raumes, was letztlich eine kompaktere und damit eine gegenüber einem thermisch bedingten Verzug unempfindlichere Anlagenauslegung erlaubt.Due to the very simply designed flow guidance of the device according to the invention, the two gas flows are deflected only twice by about 90 °, so that the flow channel systems consist of a few simple, straight channel sections in which easily heating or cooling elements for the purpose of heat treatment or cooling of the web-like Have the material installed. The type of flow guidance according to the invention also makes possible an optimized utilization of the space available in the device, which ultimately allows a more compact system design, which is less susceptible to thermally induced distortion.

Nach einer ersten Ausgestaltung der Erfindung ist vorgesehen, dass das bahnförmige Material horizontal durch die Vorrichtung geführt wird, so dass die Schwebedüsenfelder oberhalb und unterhalb des bahnförmigen Materials angeordnet sind. Aufgrund der getrennten Regelbarkeit der Gasströme durch die für das obere und das untere Schwebedüsenfeld einzeln vorgesehenen Radialventilatoren lässt sich dabei die Tragkraft des das Band führenden gesamten Gasstromes sehr präzise einstellen. Die erfindungsgemäße Vorrichtung erlaubt prinzipiell jedoch ebenso eine vertikale oder beliebig schräge oder auch gekrümmte Führung des bahnförmigen Materials.According to a first embodiment of the invention, it is provided that the web-like material is guided horizontally through the device, so that the floating nozzle fields are arranged above and below the web-shaped material. Due to the separate controllability of the gas streams through the separately provided for the upper and lower floating nozzle jet radial fans while the carrying capacity of the band leading total gas flow can be adjusted very precisely. The device according to the invention, however, in principle also allows a vertical or any desired oblique or curved guide of the sheet material.

Die Spiralgehäuse sind derart geformt, dass die aus den Spiralgehäusen jeweils austretenden Gasströme sich in einer Ebene senkrecht zur Oberfläche des bahnförmigen Materials bis auf die gesamte Länge der Schwebedüsenfelder erweitern. Eine derartig divergente Gasströmung, welche sich lediglich bei der erfindungsgemäßen Strömungsführungen, bei der die Gasströme in einer Ebene senkrecht zur Oberfläche des bahnförmigen Materials aus den Spiralgehäusen austreten, realisieren lässt, ermöglicht eine besonders gleichmäßig Verteilung des Gases auf die einzelnen Düsenrippen, so dass folglich auch die an den Enden des Schwebedüsenfeldes angeordneten Düsenrippen mit dem gleichen Volumenstrom versorgt werden wie die auf Höhe des jeweiligen Radialventilator liegenden.The spiral casings are shaped in such a way that the gas streams emerging from the spiral casings expand in a plane perpendicular to the surface of the web-shaped material up to the entire length of the floating nozzle fields. Such a divergent gas flow, which can be realized only in the flow guides according to the invention, in which the gas flows in a plane perpendicular to the surface of the sheet material from the volute, realizes a particularly uniform distribution of the gas to the individual nozzle ribs, and consequently also the arranged at the ends of the floating nozzle field nozzle ribs are supplied with the same volume flow as lying at the level of the respective centrifugal fan.

Die Gleichmäßigkeit der Gasströmung, d.h. ein annähernd identischer und zeitlich konstanter Volumenstrom in jeder Düsenrippe, kann entscheidend weiter verbessert werden, indem die Spiralgehäuse jeweils ein gekrümmtes Strömungsleitblech aufweisen, welches den von dem jeweiligen Radialventilator erzeugten Gasstrom im wesentlichen halbiert. Damit wird der Gasstrom bereits im Spiralgehäuse in zwei Teilströme aufgeteilt, welche jeweils eine Gruppe von Düsenrippen versorgen.The uniformity of the gas flow, ie an approximately identical and temporally constant volume flow in each nozzle rib, can be decisively further improved by the spiral housing each having a curved Strömungsleitblech, which halves the gas flow generated by the respective centrifugal fan substantially. Thus, the gas flow is already in Spiral housing divided into two sub-streams, which each supply a group of nozzle ribs.

Eine in Längsrichtung der Vorrichtung, d.h. in Transportrichtung des bahnförmigen Materials, äußerst platzsparende Anordnung der beiden Spiralgehäuse kann dadurch erreicht werden, dass diese punktsymmetrisch in bezug auf den Mittelpunkt der Verbindungslinie der Radialventilatorachsen ausgerichtet sind. Auch senkrecht dazu kann der Platzbedarf beider Spiralgehäuse weiter verringert werden, indem beide Radialventilatorachsen auf einer parallel zur Transportrichtung des bahnförmigen Materials verlaufenden Linie angeordnet sind.A longitudinal direction of the device, i. in the transport direction of the web material, extremely space-saving arrangement of the two spiral housings can be achieved in that they are aligned point-symmetrically with respect to the center of the connecting line of the radial fan axes. Also perpendicular to the space requirement of both spiral housing can be further reduced by both radial fan axes are arranged in a direction parallel to the transport direction of the sheet material extending line.

Nach einer weiteren Ausgestaltung der Erfindung weist die Vorrichtung zum Zwecke der Wärmebehandlung des bahnförmigen Materials wenigstens ein Heizelement zur Erhitzung des Gases auf. Durch Einbau eines Heizelementes lässt sich die erfindungsgemäße Vorrichtung ohne großen konstruktiven Aufwand zu einem Bandschwebeofen erweitern. Alternativ kann die Vorrichtung auch mit Kühlelementen ausgerüstet sein, die eine kontrollierte Abkühlung des durch die Vorrichtung geführten Bandes ermöglichen.According to a further embodiment of the invention, the device for the purpose of heat treatment of the web-shaped material at least one heating element for heating the gas. By installing a heating element, the device according to the invention can be expanded without great constructive effort to a strip float furnace. Alternatively, the device may also be equipped with cooling elements that allow a controlled cooling of the guided through the device band.

Die Wärmeübertragung von dem Heizelement auf das bahnförmige Material erfolgt konvektiv, also durch Abgabe von Wärme an das das Heizelement umströmende Gas, welches seinerseits das bahnförmige Material umströmt und dabei aufheizt. Um die Effektivität dieses Prozesses zu steigern, ist es zweckmäßig, jeweils wenigstens ein Heizelement in beiden Strömungskanalsystemen anzuordnen, da anders als im Saugraum der Vorrichtung in diesen Bereichen das Gas das Heizelement mit besonders großer Geschwindigkeit umströmt.The heat transfer from the heating element to the web-shaped material is convective, ie by the release of heat to the gas flowing around the heating element, which in turn flows around the web-like material and thereby heats up. To increase the effectiveness of this process, it is expedient to arrange in each case at least one heating element in both flow channel systems, since unlike in the suction chamber of the device in these areas, the gas flows around the heating element with particularly high speed.

Das Heizelement kann als ein durch Verbrennungsgase von innen beheiztes Heizrohr oder auch als Elektroheizelement ausgebildet sein, wobei es unter konstruktiven Gesichtspunkten vorteilhaft ist, dieses derart in der Vorrichtung anzuordnen, dass es sich quer zur Transportrichtung des bahnförmigen Materials und parallel zu dessen Oberfläche erstreckt. Zu einer weiteren Verbesserung der Wärmeübertragung an das Gas ist es zudem sinnvoll, die für die Wärmeübertragung wirksame Oberfläche des Heizrohres zu vergrößern, beispielsweise indem das Heizrohr an seinem in die Vorrichtung hineinragenden Ende zusätzlich eine Heizschlaufe aufweist, in einer Draufsicht also beispielsweise p-förmig ausgebildet ist.The heating element can be designed as a heating tube heated by combustion gases from the inside or else as an electric heating element, it being advantageous from a constructional point of view to arrange it in the device in such a way that it extends transversely to the transport direction of the sheet material and parallel to its surface. For a further improvement of the heat transfer to the gas, it is also useful to increase the effective heat transfer surface of the heating tube, for example by the heating tube additionally has a heating loop at its end projecting into the device, in a plan view, for example, p-shaped is.

Eine mehrstufige Führung oder Behandlung des bahnförmigen Materials lässt sich dadurch erreichen, dass die erfindungsgemäße Vorrichtung aus mehreren in Transportrichtung des bahnförmigen Materials hintereinander angeordneten Einheiten besteht. Ist eine Wärmebehandlung des bahnförmigen Materials in einer solchen Anlage vorgesehen, so ist wenigstens eine der Einheiten mit wenigstens einem Heizelement ausgerüstet, welches in der oben beschriebenen Weise, beispielsweise als Heizrohr, ausgebildet sein kann. Soll das bahnförmige Material nach der Aufheizung wieder abgekühlt werden, so kann entsprechend vorgesehen sein, dass die auf die Heizeinheit folgende Einheit mit Kühlelementen zur kontrollierten Abkühlung des bahnförmigen Materials ausgerüstet ist.A multi-level guidance or treatment of the sheet-like material can be achieved in that the device according to the invention consists of a plurality of units arranged one behind the other in the direction of transport of the sheet material. If a heat treatment of the web-shaped material is provided in such a system, then at least one of the units is equipped with at least one heating element, which may be formed in the manner described above, for example as a heating tube. If the sheet-like material to be cooled again after heating, it may be provided accordingly that the unit following the heating unit is equipped with cooling elements for controlled cooling of the sheet material.

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

Fig. 1
eine Vorrichtung zur horizontalen schwebenden Führung und Wärmebehandlung von Metallbändern mittels eines Gases in schematisierter seitlicher Schnittansicht,
Fig. 2
die Vorrichtung aus Fig. 1 in schematisierter stirnseitiger Schnittansicht gemäß der Linie II-II aus Fig. 1,
Fig. 3
die Vorrichtung aus Fig. 1 in schematisierter seitlicher Schnittansicht gemäß der Linie III-III aus Fig. 2 und
Fig. 4
die Vorrichtung aus Fig. 1 in Draufsicht gemäß dem Pfeil IV aus Fig. 3.
In the following the invention will be explained in more detail with reference to a drawing showing only one embodiment. Show it:
Fig. 1
a device for horizontal floating guidance and heat treatment of metal strips by means of a gas in a schematic sectional side view,
Fig. 2
the device off Fig. 1 in a schematic frontal sectional view along the line II-II Fig. 1 .
Fig. 3
the device off Fig. 1 in a schematic sectional side view along the line III-III Fig. 2 and
Fig. 4
the device off Fig. 1 in plan view according to the arrow IV Fig. 3 ,

Die in der Figur 1 dargestellte Vorrichtung zur schwebenden Führung und Wärmebehandlung von Metallband umfasst ein quaderförmiges Gehäuse 1 mit einem Einlaufschlitz 1a und einem Auslaufschlitz 1b, durch welche das zu behandelnde Metallband B in die Vorrichtung hineingeführt bzw. aus ihr herausgeführt wird. Beim Durchlauf durch die Vorrichtung wird das Metallband B von einem oberen und einem unteren Düsenfeld 2, 3 mit Gas beaufschlagt und somit schwebend geführt. Dabei umfassen die Düsenfelder 2, 3 jeweils eine Anzahl von Düsenrippen 2a, 3a, aus denen das Gas auf das Band B aufströmt, sowie jeweils zwischen zwei Düsenrippen 2a, 3a angeordnete Abströmkanäle 2b, 3b, über welche die an den Bandoberflächen reflektierten Gasströme in einen Saugraum 4 wieder abströmen. Der quaderförmige Saugraum 4 ist in der Ansicht der Figur 1 hinter den Schwebedüsenfeldern angeordnet und erstreckt sich über die gesamte Länge der Vorrichtung. Wie bereits erwähnt, wird das durch die Vorrichtung schwebend geführte Metallband B zugleich wärmebehandelt. Dazu sind vorliegend oberhalb bzw. unterhalb der Schwebedüsenfelder 2, 3 jeweils drei Heizelemente 7, 8 angeordnet, welche die Gasströme vor Eintritt in die Düsenrippen erhitzen, wie im folgenden noch näher beschrieben wird.The in the FIG. 1 illustrated device for the floating guidance and heat treatment of metal strip comprises a cuboid housing 1 with an inlet slot 1a and an outlet slot 1b, through which the metal strip B to be treated is guided into or out of the device. When passing through the device, the metal strip B is acted upon by an upper and a lower nozzle array 2, 3 with gas and thus guided floating. In this case, the nozzle fields 2, 3 each comprise a number of nozzle ribs 2a, 3a, from which the gas flows onto the belt B, and each arranged between two nozzle ribs 2a, 3a outflow channels 2b, 3b, via which the gas flows reflected at the belt surfaces in a Suction chamber 4 flow out again. The cuboid suction chamber 4 is in the view of FIG. 1 arranged behind the floating nozzle fields and extends over the entire length of the device. As already mentioned, the metal strip B suspended by the device is heat-treated at the same time. For this purpose, in each case above and below the floating nozzle fields 2, 3 three heating elements 7, 8 are arranged, which the gas streams before entering the nozzle ribs heat, as will be described in more detail below.

Wie in der seitlichen Schnittansicht der Figur 3 gezeigt, ist dem oberen und dem unteren Schwebedüsenfeld 2, 3 jeweils ein Radialventilator 5, 6 zugeordnet, wobei der Radialventilator 5 das obere und der Radialventilator 6 das untere Schwebedüsenfeld 2, 3 speist. Beide Radialventilatoren sind dabei in bezug auf das Metallband B auf der gleichen Seite der Vorrichtung positioniert (siehe Figur 2) und werden jeweils durch einen eigenen nicht dargestellten Motor angetrieben. Die Radialventilatoren 5, 6 sind ferner in Spiralgehäusen 5a, 6a angeordnet, welche derart ausgerichtet sind, dass die von den Radialventilatoren 5, 6 erzeugten Gasströme in einer Ebene senkrecht zur Oberfläche des Metallbandes B aus den Spiralgehäusen 5a, 6a austreten. Weiterhin sind die Spiralgehäuse 5a, 6a derart geformt, dass sich die aus ihnen austretenden Gasströme bis auf die gesamte Länge der Schwebedüsenfelder 2, 3 erweitern. Eine derartig divergente Gasströmung ermöglicht dabei eine besonders gleichmäßige Verteilung des Gases auf die einzelnen Düsenrippen, so dass folglich die an den Enden der Schwebedüsenfelder 2, 3 angeordneten Düsenrippen 2a, 3a mit dem gleichen Volumenstrom versorgt werden, wie die auf Höhe der Radialventilatoren 5, 6 liegenden. Vorzugsweise ist innerhalb der Spiralgehäuse 5a, 6a zudem jeweils ein gekrümmtes Strömungsleitblech 5b, 6b vorgesehen, welches den von dem jeweiligen Radialventilator 5, 6 erzeugten, in Figur 3 mit Pfeilen dargestellten Gasstrom im wesentlichen halbiert. Dies trägt ebenfalls zu einer Vergleichmäßigung der Gasströme bei.As in the side sectional view of FIG. 3 is shown, the upper and the lower floating nozzle field 2, 3 is associated with a respective radial fan 5, 6, wherein the radial fan 5, the upper and the centrifugal fan 6, the lower floating nozzle field 2, 3 feeds. Both centrifugal fans are positioned with respect to the metal strip B on the same side of the device (see FIG. 2 ) and are each driven by a separate motor, not shown. The radial fans 5, 6 are further arranged in spiral housings 5a, 6a, which are aligned such that the gas flows generated by the radial fans 5, 6 in a plane perpendicular to the surface of the metal strip B from the volute casings 5a, 6a exit. Furthermore, the spiral housings 5a, 6a are shaped in such a way that the gas streams emerging from them expand up to the entire length of the floating nozzle fields 2, 3. Such a divergent gas flow allows a particularly uniform distribution of the gas to the individual nozzle ribs, so that consequently the arranged at the ends of the floating nozzle fields 2, 3 nozzle ribs 2a, 3a are supplied with the same volume flow, as at the level of the radial fans 5, 6th lying. In addition, in each case a curved flow baffle 5b, 6b is provided within the spiral housing 5a, 6a, which in each case generates the flow baffle 5, 6 produced by the respective radial fan 5, 6 FIG. 3 Halved essentially with gas streams represented by arrows. This also contributes to a homogenization of the gas flows.

Die relativ voluminösen Spiralgehäuse 5a, 6a können gleichwohl platzsparend in bezug auf Länge und Höhe der Vorrichtung an deren einer Längswand angeordnet werden. Dazu sind sie bevorzugt punktsymmetrisch in bezug auf den Mittelpunkt der Verbindungslinie der Radialventilatorachsen ausgerichtet. Zudem sind beide Radialventilatorachsen vorzugsweise auf einer parallel zur Transportrichtung des bahnförmigen Materials verlaufenden Linie angeordnet.The relatively bulky volute casing 5a, 6a can nevertheless be arranged to save space with respect to length and height of the device at one longitudinal wall. For this purpose, they are preferably aligned point-symmetrically with respect to the center of the connecting line of the centrifugal fan axes. In addition, both radial fan axes are preferably arranged on a line running parallel to the transport direction of the web material.

Wie in der stirnseitigen Schnittansicht der Vorrichtung (Figur 2) gezeigt, sind die Spiralgehäuse 5a, 6a Teil zweier U-förmig gestalteter Strömungskanalsysteme S1, S2, über welche die von den Radialventilatoren 5, 6 erzeugten Gasströme in die Düsenrippen 2a, 3a der Schwebedüsenfelder 2, 3 gelangen. Dabei treten die Gasströme, wie bereits erwähnt, zunächst in einer Ebene senkrecht zur Oberfläche des bahnförmigen Materials aus den Spiralgehäusen 5a, 6a aus und strömen anschließend durch zweifache Umlenkung um jeweils ca. 90° in die Düsenrippen 2a, 3a der Schwebedüsenfelder 2, 3 auf deren jeweils rückwärtiger Seite ein. Dabei werden die U-förmigen Strömungskanalsysteme S1, S2 außenseitig durch die Gehäusewand 1 und innenseitig durch die Wand des Saugraumes 4 begrenzt.As in the frontal sectional view of the device ( FIG. 2 ), the spiral housings 5a, 6a are part of two U-shaped flow channel systems S1, S2, via which the gas streams generated by the centrifugal fans 5, 6 pass into the nozzle ribs 2a, 3a of the floating nozzle fields 2, 3. As already mentioned, the gas streams initially emerge from the spiral casings 5a, 6a in a plane perpendicular to the surface of the sheet-like material and then flow through the nozzle ribs 2a, 3a of the floating nozzle fields 2, 3 by twice about 90 ° each their respective rear side. The U-shaped flow channel systems S1, S2 are bounded on the outside by the housing wall 1 and on the inside by the wall of the suction chamber 4.

Nach der ersten Umlenkung strömen die Gasströme horizontal und quer zur Transportrichtung des Metallbandes B, wobei sie die sowohl oberhalb als auch unterhalb der Schwebedüsenfelder 2, 3 angeordneten Heizelemente 7, 8 umströmen. Die Heizelemente 7, 8 sind vorzugsweise als durch Verbrennungsgase von innen beheizte Heizrohr ausgebildet, welche sich quer zur Transportrichtung des Bandes B und parallel zu seiner Oberfläche erstrecken. Ferner weisen die Heizelemente 7, 8 zur Erhöhung ihrer wirksamen Oberfläche an ihren in die Vorrichtung hineinragenden Enden zusätzlich jeweils eine Heizschlaufe auf, so dass sie, wie in Figur 4 dargestellt, in Draufsicht p-förmig ausgebildet sind. Dadurch, dass sämtliche Heizelemente 7, 8 in den Strömungskanalsystemen S1, S2 und nicht im Saugraum 4 angeordnet sind, werden sie durch die von den Radialventilatoren 5, 6 beschleunigten Gasströme besonders schnell umströmt, was eine effektive Aufheizung des Gases und damit eine effektive konvektive Wärmeübertragung von den Heizelementen 7, 8 auf das Metallband B bewirkt.After the first deflection, the gas streams flow horizontally and transversely to the transport direction of the metal strip B, wherein they flow around the heating elements 7, 8 arranged both above and below the floating nozzle fields 2, 3. The heating elements 7, 8 are preferably formed as by combustion gases from inside heated heating tube, which extend transversely to the transport direction of the belt B and parallel to its surface. Furthermore, in order to increase their effective surface, the heating elements 7, 8 additionally each have a heating loop at their ends projecting into the device, so that they, as in FIG FIG. 4 represented, are formed in plan view p-shaped. Characterized in that all the heating elements 7, 8 are arranged in the flow channel systems S1, S2 and not in the suction chamber 4, they are surrounded by the accelerated by the centrifugal fans 5, 6 gas flows particularly fast, resulting in effective heating of the gas and thus an effective convective heat transfer effected by the heating elements 7, 8 on the metal strip B.

Die durch die Heizelemente 7, 8 aufgeheizten Gasströme strömen in die Düsenrippen 2a, 3a der Schwebedüsenfelder 2, 3 über deren jeweils rückwärtige Seite ein und schließlich über in den Düsenrippen 2a, 3a vorgesehene (nicht dargestellte) Düsen auf die Bandoberfläche auf. Dort werden die Gasströme in die Abströmkanäle 2b, 3b reflektiert, von wo aus sie über in der Seitenwand des Saugraumes 4 vorgesehene Öffnungen 4b in diesen eintreten. Das im Saugraum gesammelte Gas wird wiederum über die Ansaugstutzen 4a von den Radialventilatoren 5, 6 angesaugt und erneut beschleunigt.The gas streams heated by the heating elements 7, 8 flow into the nozzle ribs 2 a, 3 a of the floating nozzle fields 2, 3 via their respective rearward side and finally to the strip surface via nozzles (not shown) provided in the nozzle ribs 2 a, 3 a. There, the gas streams are reflected in the outflow channels 2b, 3b, from where they enter through openings 4b provided in the side wall of the suction chamber 4 in these. The gas collected in the suction chamber is in turn sucked in via the intake 4 a of the centrifugal fans 5, 6 and accelerated again.

Die in den Figuren 1 bis 4 dargestellte Vorrichtung besteht aus einer Einheit. Es versteht sich, dass zum Zwecke einer kontrollierten Wärmebehandlung und Abkühlung mehrere der vorstehend beschriebenen Einheiten hintereinander angeordnet werden können, wobei mindestens eine der Einheiten mit den vorstehend beschriebenen Heizelementen 7, 8 ausgerüstet ist und vorzugsweise eine weitere Einheit, insbesondere die der Heizeinheit unmittelbar folgende, mit Kühlelementen ausgerüstet ist.The in the FIGS. 1 to 4 illustrated device consists of a unit. It is understood that for the purpose of a controlled heat treatment and cooling several of the units described above can be arranged one behind the other, wherein at least one of the units is equipped with the above-described heating elements 7, 8 and preferably a further unit, in particular immediately following the heating unit, equipped with cooling elements.

Claims (12)

  1. A device for suspended guidance of web-like material (B), in particular of metal strips, by means of a gas comprising at least one unit in which respectively one levitation nozzle array (2, 3) comprising nozzle bars (2a, 3a) from which gas flows onto the web-like material (B) is located on both surfaces of the web-like material (B), and each levitation nozzle array (2, 3) is supplied with gas via a flow channel system (S1, S2) by an associated radial fan (5, 6) which is arranged in a spiral housing (2a, 3a) laterally offset with respect to the respective levitation nozzle array (2, 3) in relation to the web-like material (B), wherein both radial fans (5, 6) in the unit are arranged on the same side in relation to the web-shaped material,
    characterised in that the flow channel systems (S1, S2) are each configured as U-shaped when viewed in the direction of transport of the web-like material so that the gas flows generated by the radial fans (5, 6) emerge from the spiral housings (5a, 6a) in a plane perpendicular to the surface of the web-like material (B) and then flow through a merely double deflection each by about 90° into the nozzle bars (2a, 3a) of the levitation nozzle arrays (2, 3) on their respective rear side, the spiral housings (5a, 6a) being formed in such a manner that the gas flows emerging from the spiral housings (5a, 6a) each expand in a plane perpendicular to the surface of the web-like material (B) as far as the total length of the suspended nozzle arrays (2, 3).
  2. The device according to claim 1,
    characterised in that the web-like material (B) is guided horizontally through the unit so that the levitation nozzles arrays (2, 3) are located above and below the web-like material (B).
  3. The device according to claim 1 or 2,
    characterised in that the spiral housings (5a, 6a) each have a curved flow baffle (5b, 6b) which substantially halves the gas flow generated by the respective radial fan (5, 6).
  4. The device according to any one of claims 1 to 3,
    characterised in that the spiral housings (5a, 6a) are aligned with point symmetry in relation to the mid-point of the connecting line of the axes of the radial fans.
  5. The device according to any one of claims 1 to 4,
    characterised in that both radial fan axes are arranged on a line running parallel to the direction of transport of the web-like material (B).
  6. The device according to any one of claims 1 to 5,
    characterised in that for the purpose of heat treatment of the web-like material (B) the unit has at least one heating element (7, 8) for heating the gas.
  7. The device according to claim 6,
    characterised in that at least one heating element (7, 8) is arranged in both of the flow channel systems (S1, S2).
  8. The device according to claim 6 or 7,
    characterised in that the heating element (7, 8) is configured as a heating tube heated internally by combustion gas.
  9. The device according to claim 8,
    characterised in that the heating tube (7, 8) extends transversely to the direction of transport of the web-like material (B) and parallel to its surface.
  10. The device according to claim 8 or 9,
    characterised in that the heating tube (7, 8) additionally has a heating loop at its end projecting into the unit.
  11. The device according to any one of claims 1 to 10,
    characterised in that the device consists of a plurality of units arranged one behind the other in the direction of transport of the web-like material (B).
  12. The device according to any one of claims 6 to 10 and 11,
    characterised in that at least one of the units is fitted with at least one heating element (7, 8).
EP04797984A 2003-12-10 2004-11-18 Device for suspended guidance of strip-like materials Expired - Lifetime EP1699721B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10358142A DE10358142A1 (en) 2003-12-10 2003-12-10 Device for floating sheet material
PCT/EP2004/013091 WO2005056448A1 (en) 2003-12-10 2004-11-18 Device for suspended guidance of strip-like materials

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EP1699721A1 EP1699721A1 (en) 2006-09-13
EP1699721B1 EP1699721B1 (en) 2008-01-16
EP1699721B2 true EP1699721B2 (en) 2011-11-30

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AT (1) ATE384020T1 (en)
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Publication number Priority date Publication date Assignee Title
DE102006056518A1 (en) * 2006-11-06 2008-05-08 Otto Junker Gmbh Device for the floating guidance of sheet material
DE102011103806B3 (en) 2011-06-01 2012-11-22 Otto Junker Gmbh Apparatus for floating metallic strips by means of a gas and a method for operating such a device
DE102014006233A1 (en) 2014-04-30 2015-11-05 Otto Junker Gmbh Device for the floating guidance of sheet material
DE202016101584U1 (en) 2016-01-22 2016-04-25 Otto Junker Gmbh Device for floating guiding and simultaneous cooling of web material
DE102019102595A1 (en) 2019-02-01 2020-08-06 Otto Junker Gmbh Method for cooling moving metal material and device for carrying out such a method
DE102021130814A1 (en) 2021-11-24 2023-05-25 Otto Junker Gesellschaft mit beschränkter Haftung Heat treatment plant with a furnace and a cooling section and heat treatment method

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EP0864519B1 (en) † 1997-03-12 2003-06-25 Kramer, Carl, Prof.Dr.-Ing. Apparatus to guide webs in a floating manner

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US3496647A (en) * 1968-03-01 1970-02-24 Samcoe Holding Corp Dryer for fabrics and the like
DE2056190C3 (en) * 1970-11-16 1978-10-12 Fa. F.W. Carduck, 5100 Aachen Nozzle dryer for continuously running web-shaped material
US3739491A (en) * 1971-09-22 1973-06-19 Tec Systems High velocity air web dryer
DE2908348A1 (en) * 1979-03-03 1980-09-04 Vits Maschinenbau Gmbh FLOATING DRYER
JPS5742371A (en) * 1980-08-28 1982-03-09 Daido Steel Co Ltd Continuous paint-drying and baking oven
DD255201B5 (en) * 1986-12-19 1994-03-10 Textilmaschinenbau Gera Gmbh DEVICE FOR THE HEAT TREATMENT OF TRACKS, IN PARTICULAR TEXTILE TRACKS
DE19804184A1 (en) * 1998-02-03 1999-08-05 Kramer Carl Device for floating guidance of tapes

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0864519B1 (en) † 1997-03-12 2003-06-25 Kramer, Carl, Prof.Dr.-Ing. Apparatus to guide webs in a floating manner

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ATE384020T1 (en) 2008-02-15
DE10358142A1 (en) 2005-07-14
WO2005056448A1 (en) 2005-06-23
EP1699721A1 (en) 2006-09-13
DE502004005996D1 (en) 2008-03-06
EP1699721B1 (en) 2008-01-16

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