EP0708186B1 - Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip - Google Patents

Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip Download PDF

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Publication number
EP0708186B1
EP0708186B1 EP95114997A EP95114997A EP0708186B1 EP 0708186 B1 EP0708186 B1 EP 0708186B1 EP 95114997 A EP95114997 A EP 95114997A EP 95114997 A EP95114997 A EP 95114997A EP 0708186 B1 EP0708186 B1 EP 0708186B1
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EP
European Patent Office
Prior art keywords
pickling
strip
pickling liquid
nozzles
treatment chamber
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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EP95114997A
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German (de)
French (fr)
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EP0708186A1 (en
Inventor
Michael Zednicek
Wilhelm Hofkirchner
Wilhelm Dr. Karner
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Andritz Patentverwaltungs GmbH
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Andritz Patentverwaltungs GmbH
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/022—Cleaning travelling work

Definitions

  • the invention relates to a method for continuous surface treatment by pickling and cleaning metal strips, in one Treatment chamber, with the web in an approximately horizontal path runs through the treatment chamber, the treatment chamber one Pickling liquid is supplied, with a free surface of the pickling liquid is present and the surface to be treated in the Treatment chamber exposed to an increased shear force to the pickling liquid becomes. Furthermore, the invention relates to a device for implementation of the procedure.
  • DE-A-40 31 234 shows one Flat pickling, in which a band is passed through a container and the pickling liquid is fed through side-mounted nozzles.
  • the WHERE 88/01657 also shows a flat stain similar to that in DE-A-40 31 234 shown.
  • DE-OS 1 621 603 describes one of several Chamber existing system that is completely pressurized Pickling medium is filled. Due to the nozzle shape of the channel and the movement of the band and the flow of the liquid as well as the expansion cleaning of the belt surface of the medium is achieved here.
  • the DE-AS 1 521 753 describes a cleaning system especially for magnetic tapes for sound recordings, films or extruded metal profiles.
  • medium under pressure is supplied and flows through a nozzle-shaped channel along its length Beginning or end.
  • the supply of the treatment medium, in particular Pickling acid generally takes place at the entry or exit of the strip the treatment chamber, which additionally seals the treatment chamber from the environment, as well as laterally into the Treatment chamber.
  • DE-A-41 08 516 describes a high-speed pickling device, where the steel band in a channel is guided, which has openings for the supply and removal of pickling acid.
  • the present invention aims to improve treatment effectiveness, especially with pickling, to be increased by apparatus length or apparatus costs for a corresponding system or to significantly reduce the treatment temperature and thereby reduce operating costs.
  • the invention is therefore characterized in that the surface seen continuously by several devices with itself in the direction of tape travel narrowing cross section and that in the area of Application of the increased shear force, fresh pickling liquid supplied and the pickling liquid is swirled in this area.
  • This increased Shear force reduces the liquid boundary layer on the belt surface which results in an increased pickling effect and the pickling time is reduced. Through repeated treatment, the surface can be cleaned even better become.
  • the supply of pickling acid directly in the area of application the increased shear force and most swirled Liquid area ensures a quick introduction of pickling acid to the belt, which causes a further increased pickling intensity.
  • a favorable further development of the invention is characterized in that that the supply of the treating liquid is regulated in its amount, the pickling liquid supplied alone or in combination with the Quantity can be regulated. By varying the amount and or or the temperature of the pickling medium, the pickling effect can be adjusted accordingly the requirements vary.
  • An advantageous embodiment of the invention is characterized in that that the surface to be treated is in position by the pickling liquid fixed, especially in facilities to increase the shear force is centered.
  • the tape can touch the ground and produce Scratches in the belt can be avoided.
  • the invention also relates to a device for continuous surface treatment by pickling and cleaning metal strips, with a treatment chamber, the web being in an approximately horizontal Pathway runs through the treatment chamber, leaving a free surface the pickling liquid is present and is characterized by that several devices are provided in the treatment chamber, which increases the shear force between the belt and pickling liquid opposite to that caused by the movement of the web in the treatment chamber resulting shear force, the devices in the tape running direction seen an area with continuously narrowing Have cross section and that in the area of the devices nozzles Introduction of pickling liquid are provided. Through this increase The liquid boundary layer is reduced by shear force, resulting in an increased Pickling effect results.
  • the shape of a Venturi nozzle can be a good one Whirling of the liquid and thus an increase in the pickling intensity be effected. Furthermore, such a facility Height-centered belt, especially centered in the Venturi module, thus touching the ground and the associated generation of Scratching on the belt surface is avoided. Will be in the area of Facilities pickling liquid the liquid is whirled through even more, which, on the other hand, leads to a rapid introduction of the acid to the tape takes place, which causes an increased pickling intensity.
  • a favorable further development of the invention is characterized in that that the nozzles arranged in the direction of tape travel after the device are, these also, if necessary additionally, before or in the Device can be arranged.
  • the arrangement of the nozzles after setting up, the treatment medium is supplied in an area of increased fluidized fluid, with an injection additional swirling and before setting up in this area thus causes improved pickling intensity.
  • An arrangement of the nozzles in the device supports the hydrodynamic effect of the device and also avoids touching the belt with the device low speeds. Specifically a combination of all arrangements leads to an optimal pickling intensity.
  • An advantageous embodiment of the invention is characterized in that that the nozzles are arranged below the material web, the Alternatively or in combination, nozzles are arranged above the material web could be.
  • the nozzles can move in the direction of the belt pointing openings or pointing against the tape running direction Have openings. Through a suitable arrangement and alignment the pickling effect can additionally be influenced favorably.
  • a favorable further development of the invention is characterized in that that at least one derivation for pickling liquid is provided, which with Nozzles for supplying pickling liquid at at least one point in the Treatment chamber is connected.
  • An advantageous development of the invention is characterized in that that at least one pump is connected between discharge and supply is.
  • the circulation volume can be adjusted accordingly by controlling a pump set and also the exit speed from the Nozzles are adjusted accordingly for an optimal pickling effect.
  • a favorable embodiment of the invention is characterized in that that between discharge and supply of the pickling liquid at least one Heat supply device, in particular a heat exchanger, switched is.
  • a Heat exchanger in the additional Acid cycle can be the temperature distribution in the pickling tub influence particularly well, in particular a strong equalization the temperature can be achieved.
  • FIG. 2 a pickling section according to the invention
  • FIG. 2 a section from Fig. 1, Fig. 2a, 2b and Fig. 3 an analog section from Fig. 1, Fig. 4a, the pressure distribution in the area of an inventive provided device
  • Fig. 4b the speed distribution in the area of a device provided according to the invention
  • 5 shows the flow in the area of a device provided according to the invention represents.
  • Fig. 1 shows the diagram of a pickling section 1, that the better clarity because of without a usually arranged cover of the system is shown.
  • the steel strip 2 to be pickled moves in the direction 3.
  • an inlet area 4 with squeeze rollers 5.5 ' the strip through the pickling section 1 to an outlet area 6 with squeeze rollers 7 and 7 'performed.
  • Venturi modules 8 There are nozzles 9 for the supply of Pickling acid provided.
  • the pickling acid is always at the entrance 4 and or or outlet 6 via nozzle bar 10 in the pickling section 1 and spent pickling acid via outlets 11, 11 'into the circulation tank 12 returned.
  • the pickling acid is removed from the circulation tank 12 via a filter 13 to a pump 14 and from there through a heat exchanger 15, from where they are fed to the nozzle bar 10 via lines 16, 16 ' becomes.
  • a filter 13 to a pump 14 and from there through a heat exchanger 15, from where they are fed to the nozzle bar 10 via lines 16, 16 ' becomes.
  • one or more Place the pickling section 1 pickling liquid derived (17, 17 ') and by a Filters 18, 18 'via a pump 19, 19' and through a heat exchanger 20.20 'the nozzles 9 for reinforcement.
  • Fig. 2 shows a section of Fig. 1, in the two Venturi modules with an upper part 8 'and a lower part 8' 'are shown. Between these two parts 8 'and 8' 'of the Venturi modules 8, the Band 2 in the direction 3 and centered in height, so that a ground contact and the associated generation of scratches in volume 2 is avoided. In the area behind the Venturi modules 8 there are nozzles 9 provided by the pickling acid sprayed in the direction of the belt becomes. The acid level is marked with 21.
  • FIG. 2a and 2b show an analog section from FIG. 1, here in the In contrast to Fig. 2, the nozzles 9 in the direction 3 of the strip travel of the metal strip 2 are arranged in front of or in the Venturi modules 8. Basically these variants can also be combined, for example shown in Fig. 3, the orientation of the nozzles both an outflow can cause in as well as against the tape running direction 3. By a different quantity distribution of the leaking pickling liquid between the bottom and top of the band 2, the location of the Metal strip 2 can be set in the Venturi module 8.
  • FIG 4a shows the pressure curve 22 in area A of the cross-sectional constriction between the upper part 8 'and lower part 8' 'of the Venturi module 8.
  • the pressure increases from the entry into the Venturi module 8 and reaches approximately at the end of this section A the maximum value from where the pressure to completely dismantled in an area shortly after the Venturi module 8 becomes. Due to the symmetrical formation of the pressure curve in the Venturi module 8, the belt 2 is centered in the module.
  • FIG. 4b shows, analogously to FIG. 4a, the speed curve in the area a Venturi module 8. Due to the decreasing cross-section in the area A of the Venturi module 8 is based on a speed profile 23 an acceleration of the acid up to one via a profile 23 ' Profile 23 ".
  • the invention is not limited by the embodiments shown, in particular, the nozzles in the direction of tape travel or against the Direction of tape running. It can also have a cover be provided above the pickling section. Furthermore, within one Pickling section several separate pickling acid cycles can be provided, or several pickling sections can also be arranged one behind the other.

Description

Die Erfindung betrifft ein Verfahren zur kontinuierlichen Oberflächenbehandlung durch Beizen und Reinigen von Metallbändern, in einer Behandlungskammer, wobei die Bahn in einer etwa horizontalen Wegbahn durch die Behandlungskammer läuft, der Behandlungskammer eine Beizflüssigkeit zugeführt wird, wobei eine freie Oberfläche der Beizflüssigkeit vorhanden ist und die zu behandelnde Oberfläche in der Behandlungskammer einer erhöhten Scherkraft zur Beizflüssigkeit ausgesetzt wird. Weiters betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for continuous surface treatment by pickling and cleaning metal strips, in one Treatment chamber, with the web in an approximately horizontal path runs through the treatment chamber, the treatment chamber one Pickling liquid is supplied, with a free surface of the pickling liquid is present and the surface to be treated in the Treatment chamber exposed to an increased shear force to the pickling liquid becomes. Furthermore, the invention relates to a device for implementation of the procedure.

Es sind verschiedene Systeme zur Oberflächenbehandlung, insbesondere von Beizen, von kontinuierlich durchlaufenden Bändern bekannt, wobei die Bänder im Wesentlichen horizontal durch den Behälter und das Behandlungsmedium geführt werden. So zeigt die DE-A- 40 31 234 eine Flachbeize, bei der ein Band durch einen Behälter geführt und die Beizflüssigkeit durch seitlich angebrachte Düsen zugeführt wird. Die WO 88/01657 zeigt ebenfalls eine Flachbeize ähnlich der in der DE-A- 40 31 234 dargestellten. Die DE-OS 1 621 603 beschreibt eine aus mehreren Kammern bestehende Anlage, die vollständig mit unter Druck stehendem Beizmedium gefüllt ist. Durch die Düsenform des Kanals und die Bewegung des Bandes und die Strömung der Flüssigkeit sowie die Expansion des Mediums wird hier eine Reinigung der Bandoberfläche erreicht. Die DE-AS 1 521 753 beschreibt eine Reinigungsanlage speziell für Magnetbänder für Tonaufzeichnungen, Filmen oder Metallstrangpreßprofilen. Auch hier wird unter Druck stehendes Medium zugeführt und strömt durch einen düsenförmigen Kanal über die Länge zu dessen Anfang bzw. Ende. Die Zufuhr des Behandlungsmediums, insbesondere Beizsäure, erfolgt im Allgemeinen am Eintritt bzw. Austritt des Bandes aus der Behandlungskammer, wodurch zusätzlich eine Dichtung der Behandlungskammer von der Umgebung erfolgt, sowie auch seitlich in die Behandlungskammer. Die DE- A- 41 08 516 beschreibt eine Hochgeschwindigkeits-Beizvorrichtung, bei der das Stahlband in einem Kanal geführt wird, der Öffnungen für Zu- und Abfuhr der Beizsäure aufweist. There are various surface treatment systems, in particular of pickling, known from continuously moving belts, whereby the tapes are substantially horizontal through the container and the treatment medium be performed. For example, DE-A-40 31 234 shows one Flat pickling, in which a band is passed through a container and the pickling liquid is fed through side-mounted nozzles. The WHERE 88/01657 also shows a flat stain similar to that in DE-A-40 31 234 shown. DE-OS 1 621 603 describes one of several Chamber existing system that is completely pressurized Pickling medium is filled. Due to the nozzle shape of the channel and the movement of the band and the flow of the liquid as well as the expansion cleaning of the belt surface of the medium is achieved here. The DE-AS 1 521 753 describes a cleaning system especially for magnetic tapes for sound recordings, films or extruded metal profiles. Here too, medium under pressure is supplied and flows through a nozzle-shaped channel along its length Beginning or end. The supply of the treatment medium, in particular Pickling acid generally takes place at the entry or exit of the strip the treatment chamber, which additionally seals the treatment chamber from the environment, as well as laterally into the Treatment chamber. DE-A-41 08 516 describes a high-speed pickling device, where the steel band in a channel is guided, which has openings for the supply and removal of pickling acid.

Zwischen diesen Öffnungen sind Stauglieder vorgesehen, die einerseits eine bessere Strömungsführung ermöglichen und andererseits zu einer Verwirbelung der Säure in diesem Bereich führen. Die weiters bekannte JP-61-41783, zeigt in Fig. 7 eine Bandbehandlungsanlage, wobei das Band ebenfalls in einem Kanal geführt wird. Dieser Kanal weist im Bereich des Abflusses des Mediums sprunghafte Erweiterungen auf. All diese Systeme weisen jedoch eine ungenügende Beizwirkung auf, wodurch für eine gegebene Durchsatzmenge bei entsprechenden Qualitätsanforderungen meist recht lange und entsprechend kostenintensive Vorrichtungen erforderlich sind.Dams are provided between these openings, on the one hand enable better flow control and on the other hand to one Swirl the acid in this area. The further known JP-61-41783 shows in Fig. 7 a belt treatment plant, the Band is also guided in a channel. This channel points in the area leaps and bounds of the outflow of the medium. All these However, systems have an insufficient pickling effect, which means that a given throughput with appropriate quality requirements mostly quite long and correspondingly expensive devices required are.

Die vorliegende Erfindung hat zum Ziel, die Behandlungseffektivität, speziell bei Beizen, zu erhöhen um Apparatelängen bzw. Apparatekosten für eine entsprechende Anlage wesentlich zu reduzieren bzw. die Behandlungstemperatur und dadurch die Betriebskosten zu reduzieren.The present invention aims to improve treatment effectiveness, especially with pickling, to be increased by apparatus length or apparatus costs for a corresponding system or to significantly reduce the treatment temperature and thereby reduce operating costs.

Die Erfindung ist daher dadurch gekennzeichnet, daß die Oberfläche durch mehrere Einrichtungen mit sich in Bandlaufrichtung gesehen kontinuierlich verengendem Querschnitt geführt wird und daß im Bereich der Aufbringung der erhöhten Scherkraft, frische Beizflüssigkeit zugeführt und in diesem Bereich die Beizflüssigkeit verwirbelt wird. Diese erhöhte Scherkraft verringert die Flüssigkeitsgrenzschicht an der Bandoberfläche woraus eine erhöhte Beizwirkung resultiert und die Beizzeit reduziert wird. Durch die wiederholte Behandlung kann die Oberfläche noch besser gereinigt werden. Die Zufuhr der Beizsäure unmittelbar im Bereich der Aufbringung der erhöhten Scherkraft und im am meisten durchwirbelten Flüssigkeitsbereich gewährleistet eine rasche Heranführung der Beizsäure an das Band, was eine weitere erhöhte Beizintensität bewirkt.The invention is therefore characterized in that the surface seen continuously by several devices with itself in the direction of tape travel narrowing cross section and that in the area of Application of the increased shear force, fresh pickling liquid supplied and the pickling liquid is swirled in this area. This increased Shear force reduces the liquid boundary layer on the belt surface which results in an increased pickling effect and the pickling time is reduced. Through repeated treatment, the surface can be cleaned even better become. The supply of pickling acid directly in the area of application the increased shear force and most swirled Liquid area ensures a quick introduction of pickling acid to the belt, which causes a further increased pickling intensity.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Zufuhr der behandelnden Flüssigkeit in ihrer Menge geregelt wird, wobei die zugeführte Beizflüssigkeit allein oder in Kombination mit der Menge geregelt werden kann. Durch die Variation der Menge und bzw. oder der Temperatur des Beizmediums läßt sich die Beizwirkung entsprechend den Erfordernissen variieren. A favorable further development of the invention is characterized in that that the supply of the treating liquid is regulated in its amount, the pickling liquid supplied alone or in combination with the Quantity can be regulated. By varying the amount and or or the temperature of the pickling medium, the pickling effect can be adjusted accordingly the requirements vary.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die zu behandelnde Oberfläche durch die Beizflüssigkeit in ihrer Lage fixiert, insbesondere in Einrichtungen zur Erhöhung der Scherkraft zentriert wird. Durch die Fixierung, insbesondere Zentrierung, des Bandes kann eine Bodenberührung und damit verbundene Erzeugung von Kratzern im Band vermieden werden.An advantageous embodiment of the invention is characterized in that that the surface to be treated is in position by the pickling liquid fixed, especially in facilities to increase the shear force is centered. By fixing, especially centering, the tape can touch the ground and produce Scratches in the belt can be avoided.

Die Erfindung betrifft ebenfalls eine Vorrichtung zur kontinuierlichen Oberflächenbehandlung durch Beizen und Reinigen von Metallbändern, mit einer Behandlungskammer, wobei die Bahn in einer etwa horizontalen Wegbahn durch die Behandlungskammer läuft, wobei eine freie Oberfläche der Beizflüssigkeit vorhanden ist, und ist dadurch gekennzeichnet, daß mehrere Einrichtungen in der Behandlungskammer vorgesehen sind, die eine Erhöhung der Scherkraft zwischen Band und Beizflüssigkeit gegenüber der durch die Bewegung der Bahn in der Behandlungskammer resultierenden Scherkraft erzielen, wobei die Einrichtungen in Bandlaufrichtung gesehen einen Bereich mit sich kontinuierlich verengendem Querschnitt aufweisen und daß im Bereich der Einrichtungen Düsen zur Einbringung von Beizflüssigkeit vorgesehen sind. Durch diese erhöhe Scherkraft wird die Flüssigkeitsgrenzschicht verringert, woraus eine erhöhte Beizwirkung resultiert. Durch diesen verengenden Querschnitt, der beispielsweise die Form einer Venturidüse aufweist, kann eine gute Durchwirbelung der Flüssigkeit und somit eine Erhöhung der Beizintensität bewirkt werden. Weiters wird durch eine derartige Einrichtung das Band höhenzentriert, insbesondere auch im Venturi-Modul mittenzentriert, wodurch eine Bodenberührung und die damit verbundene Erzeugung von Kratzern auf der Bandoberfläche vermieden wird. Wird im Bereich der Einrichtungen Beizflüssigkeit eingedüst, wird einerseits die Flüssigkeit noch stärker durchwirbelt, wodurch andererseits eine rasche Heranführung der Säure an das Band erfolgt, was eine erhöhte Beizintensität bewirkt.The invention also relates to a device for continuous surface treatment by pickling and cleaning metal strips, with a treatment chamber, the web being in an approximately horizontal Pathway runs through the treatment chamber, leaving a free surface the pickling liquid is present and is characterized by that several devices are provided in the treatment chamber, which increases the shear force between the belt and pickling liquid opposite to that caused by the movement of the web in the treatment chamber resulting shear force, the devices in the tape running direction seen an area with continuously narrowing Have cross section and that in the area of the devices nozzles Introduction of pickling liquid are provided. Through this increase The liquid boundary layer is reduced by shear force, resulting in an increased Pickling effect results. Due to this narrowing cross section, the For example, the shape of a Venturi nozzle can be a good one Whirling of the liquid and thus an increase in the pickling intensity be effected. Furthermore, such a facility Height-centered belt, especially centered in the Venturi module, thus touching the ground and the associated generation of Scratching on the belt surface is avoided. Will be in the area of Facilities pickling liquid the liquid is whirled through even more, which, on the other hand, leads to a rapid introduction of the acid to the tape takes place, which causes an increased pickling intensity.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Düsen in Bandlaufrichtung gesehen nach der Einrichtung angeordnet sind, wobei diese auch, gegebenenfalls zusätzlich, vor bzw. in der Einrichtung angeordnet sein können. Durch die Anordnung der Düsen nach der Einrichtung erfolgt die Zufuhr des Behandlungsmediums in einem Bereich erhöhter durchwirbelter Flüssigkeit, wobei eine Eindüsung vor der Einrichtung in diesem Bereich eine zusätzliche Verwirbelung und damit verbesserte Beizintensität bewirkt. Eine Anordnung der Düsen in der Einrichtung unterstützt die hydrodynamische Wirkung der Einrichtung und vermeidet die Berührung des Bandes mit der Einrichtung auch bei niedrigen Geschwindigkeiten. Speziell eine Kombination aller Anordnungen führt zu einem Optimum an Beizintensität.A favorable further development of the invention is characterized in that that the nozzles arranged in the direction of tape travel after the device are, these also, if necessary additionally, before or in the Device can be arranged. The arrangement of the nozzles after setting up, the treatment medium is supplied in an area of increased fluidized fluid, with an injection additional swirling and before setting up in this area thus causes improved pickling intensity. An arrangement of the nozzles in the device supports the hydrodynamic effect of the device and also avoids touching the belt with the device low speeds. Specifically a combination of all arrangements leads to an optimal pickling intensity.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Düsen unterhalb der Materialbahn angeordnet sind, wobei die Düsen auch alternativ bzw. in Kombination oberhalb der Materialbahn angeordnet sein können. Dabei können die Düsen in die Bandlaufrichtung weisende Öffnungen bzw. gegen die Bandlaufrichtung weisende Öffnungen aufweisen. Durch eine geeignete Anordnung und Ausrichtung der Düsen kann die Beizwirkung zusätzlich günstig beeinflußt werden.An advantageous embodiment of the invention is characterized in that that the nozzles are arranged below the material web, the Alternatively or in combination, nozzles are arranged above the material web could be. The nozzles can move in the direction of the belt pointing openings or pointing against the tape running direction Have openings. Through a suitable arrangement and alignment the pickling effect can additionally be influenced favorably.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß zumindest eine Ableitung für Beizflüssigkeit vorgesehen ist, die mit Düsen zur Zufuhr von Beizflüssigkeit an zumindest einer Stelle in der Behandlungskammer verbunden ist. Durch diese Ausführung der Erfindung kann ein zusätzlicher Säurekreislauf erreicht werden, durch den eine Optimierung der Beize erzielt werden kann.A favorable further development of the invention is characterized in that that at least one derivation for pickling liquid is provided, which with Nozzles for supplying pickling liquid at at least one point in the Treatment chamber is connected. Through this execution of the An additional acid cycle can be achieved by means of the invention an optimization of the stain can be achieved.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß zwischen Ableitung und Zufuhr mindestens eine Pumpe geschaltet ist. Durch die Regelung einer Pumpe kann die Umwälzmenge entsprechend eingestellt und auch die Austrittsgeschwindigkeit aus den Düsen entsprechend für eine optimale Beizwirkung eingestellt werden.An advantageous development of the invention is characterized in that that at least one pump is connected between discharge and supply is. The circulation volume can be adjusted accordingly by controlling a pump set and also the exit speed from the Nozzles are adjusted accordingly for an optimal pickling effect.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß zwischen Ableitung und Zufuhr der Beizflüssigkeit mindestens eine Wärmezufuhreinrichtung, insbesondere ein Wärmetauscher, geschaltet ist. Durch die Anordnung eines Wärmetauschers in den zusätzlichen Säurekreislauf läßt sich die Temperaturverteilung im Beizbottich besonders gut beeinflussen, wobei insbesondere eine starke Vergleichmäßigung der Temperatur erzielt werden kann.A favorable embodiment of the invention is characterized in that that between discharge and supply of the pickling liquid at least one Heat supply device, in particular a heat exchanger, switched is. By arranging a heat exchanger in the additional Acid cycle can be the temperature distribution in the pickling tub influence particularly well, in particular a strong equalization the temperature can be achieved.

Im folgenden wird die Erfindung nun anhand von Zeichnungen beispielhaft beschrieben, wobei Fig. 1 eine Beizsektion gemäß der Erfindung, Fig. 2 einen Ausschnitt aus Fig. 1, Fig. 2a, 2b und Fig. 3 einen analogen Ausschnitt aus Fig. 1, Fig. 4a die Druckverteilung im Bereich einer erfindungsgemäß vorgesehenen Einrichtung, Fig. 4b die Geschwindigkeitsverteilung im Bereich einer erfindungsgemäß vorgesehenen Einrichtung, Fig. 5 die Strömung im Bereich einer erfindungsgemäß vorgesehenen Einrichtung darstellt.In the following the invention will now be exemplified with reference to drawings 1, a pickling section according to the invention, FIG. 2 a section from Fig. 1, Fig. 2a, 2b and Fig. 3 an analog section from Fig. 1, Fig. 4a, the pressure distribution in the area of an inventive provided device, Fig. 4b the speed distribution in the area of a device provided according to the invention, 5 shows the flow in the area of a device provided according to the invention represents.

Fig. 1 zeigt das Schema einer Beizsektion 1, das der besseren Übersichtlichkeit wegen ohne eine üblicherweise angeordnete Abdeckung der Anlage dargestellt ist. Das zu beizende Stahlband 2 bewegt sich in Richtung 3. Ausgehend von einem Einlaßbereich 4 mit Abquetschwalzen 5,5' wird das Band durch die Beizsektion 1 zu einem Auslaßbereich 6 mit Abquetschwalzen 7 und 7' geführt. In diesem Bereich sind mehrere Einrichtungen 8, die auch als Venturi-Modulen bezeichnet werden, angeordnet. Im Bereich dieser Venturi-Modulen 8 sind jeweils Düsen 9 zur Zufuhr von Beizsäure vorgesehen. Die Beizsäure wird grundsätzlich am Eintritt 4 und bzw. oder Austritt 6 über Düsenbalken 10 in die Beizsektion 1 geleitet und verbrauchte Beizsäure über Auslässe 11,11' in den Zirkulationstank 12 zurückgeführt. Vom Zirkulationstank 12 wird die Beizsäure über ein Filter 13 zu einer Pumpe 14 und von dort durch einen Wärmetauscher 15 geführt, von wo sie über Leitungen 16,16' den Düsenbalken 10 zugeführt wird. Zur besseren Regelung des Beizablaufes wird an ein oder mehreren Stellen der Beizsektion 1 Beizflüssigkeit abgeleitet (17,17') und durch ein Filter 18,18' über eine Pumpe 19,19' und durch einen Wärmetauscher 20,20' den Düsen 9 zur Verstärkung aufgegeben.Fig. 1 shows the diagram of a pickling section 1, that the better clarity because of without a usually arranged cover of the system is shown. The steel strip 2 to be pickled moves in the direction 3. Starting from an inlet area 4 with squeeze rollers 5.5 ' the strip through the pickling section 1 to an outlet area 6 with squeeze rollers 7 and 7 'performed. There are several facilities in this area 8, which are also referred to as Venturi modules, arranged. In the area of these Venturi modules 8 there are nozzles 9 for the supply of Pickling acid provided. The pickling acid is always at the entrance 4 and or or outlet 6 via nozzle bar 10 in the pickling section 1 and spent pickling acid via outlets 11, 11 'into the circulation tank 12 returned. The pickling acid is removed from the circulation tank 12 via a filter 13 to a pump 14 and from there through a heat exchanger 15, from where they are fed to the nozzle bar 10 via lines 16, 16 ' becomes. To better regulate the pickling process, one or more Place the pickling section 1 pickling liquid derived (17, 17 ') and by a Filters 18, 18 'via a pump 19, 19' and through a heat exchanger 20.20 'the nozzles 9 for reinforcement.

Fig. 2 zeigt einen Auschnitt aus Fig. 1, in dem zwei Venturi-Modulen mit jeweils einem oberen Teil 8' und einem unteren Teil 8'' dargestellt sind. Zwischen diesen beiden Teilen 8' bzw. 8'' der Venturi-Modulen 8 wird das Band 2 in die Richtung 3 geführt und höhenzentriert, sodaß eine Bodenberührung und damit verbundene Erzeugung von Kratzern in Band 2 vermieden wird. Im Bereich hinter den Venturi-Modulen 8 sind Düsen 9 vorgesehen, durch die Beizsäure in Richtung auf das Band eingedüst wird. Das Säureniveau ist mit 21 gekennzeichnet.Fig. 2 shows a section of Fig. 1, in the two Venturi modules with an upper part 8 'and a lower part 8' 'are shown. Between these two parts 8 'and 8' 'of the Venturi modules 8, the Band 2 in the direction 3 and centered in height, so that a ground contact and the associated generation of scratches in volume 2 is avoided. In the area behind the Venturi modules 8 there are nozzles 9 provided by the pickling acid sprayed in the direction of the belt becomes. The acid level is marked with 21.

Fig. 2a und 2b zeigen einen analogen Ausschnitt aus Fig. 1, wobei hier im Gegensatz zu Fig. 2 die Düsen 9 in Richtung 3 des Bandlaufs des Metallbandes 2 vor bzw. in den Venturi-Modulen 8 angeordnet sind. Grundsätzlich können diese Varianten auch kombiniert werden, wie beispielhaft in Fig. 3 dargestellt, wobei die Ausrichtung der Düsen sowohl eine Ausströmung in als auch gegen die Bandlaufrichtung 3 bewirken kann. Durch eine unterschiedliche Mengenverteilung des auströmenden Beizflüssigkeit zwischen Unterseite und Oberseite des Bandes 2 kann die Lage des Metallbandes 2 im Venturi-Modul 8 eingestellt werden.2a and 2b show an analog section from FIG. 1, here in the In contrast to Fig. 2, the nozzles 9 in the direction 3 of the strip travel of the metal strip 2 are arranged in front of or in the Venturi modules 8. Basically these variants can also be combined, for example shown in Fig. 3, the orientation of the nozzles both an outflow can cause in as well as against the tape running direction 3. By a different quantity distribution of the leaking pickling liquid between the bottom and top of the band 2, the location of the Metal strip 2 can be set in the Venturi module 8.

Fig. 4a zeigt den Druckverlauf 22 im Bereich A der Querschnittsverengung zwischen dem oberen Teil 8' und unteren Teil 8'' des Venturi-Moduls 8. Der Druck nimmt vom Eintritt in den Venturi-Modul 8 zu und erreicht etwa am Ende dieses Abschnitts A den Maximalwert, von wo aus der Druck bis in einem Bereich kurz nach dem Venturi-Modul 8 wieder vollständig abgebaut wird. Durch die symmetrische Ausbildung des Druckverlaufes im Venturi-Modul 8 wird das Band 2 im Modul mittenzentriert.4a shows the pressure curve 22 in area A of the cross-sectional constriction between the upper part 8 'and lower part 8' 'of the Venturi module 8. The pressure increases from the entry into the Venturi module 8 and reaches approximately at the end of this section A the maximum value from where the pressure to completely dismantled in an area shortly after the Venturi module 8 becomes. Due to the symmetrical formation of the pressure curve in the Venturi module 8, the belt 2 is centered in the module.

Fig. 4b zeigt analog zu Fig. 4a den Geschwindigkeitsverlauf im Bereich eines Venturi-Moduls 8. Durch den abnehmenden Querschnitt im Bereich A des Venturi-Moduls 8 erfolgt ausgehend von einem Geschwindigkeitsprofil 23 über ein Profil 23' eine Beschleunigung der Säure bis zu einem Profil 23".4b shows, analogously to FIG. 4a, the speed curve in the area a Venturi module 8. Due to the decreasing cross-section in the area A of the Venturi module 8 is based on a speed profile 23 an acceleration of the acid up to one via a profile 23 ' Profile 23 ".

Fig. 5 zeigt nunmehr die Strömungsverhältnisse im Bereich eines Venturi-Moduls 8, wobei am Einlauf in den Venturi-Modul 8 die Strömungsrichtung mit 24 bezeichnet ist und im Bereich des Auslaufs des Moduls 8 eine turbulente Wirbelströmung 25 erkennbar ist. In diesem Bereich der Wirbelströmung 25 wird über die Düsen 9 frisches Behandlungsmedium zugeführt, wodurch eine rasche Heranführung der frischen Säure an das Band gewährleistet wird, was eine erhöhte Beizintensität bewirkt.5 now shows the flow conditions in the area of a Venturi module 8, the flow direction at the inlet into the Venturi module 8 is designated by 24 and in the area of the outlet of the module 8 turbulent vortex flow 25 can be seen. In this area of Vortex flow 25 is fresh treatment medium through the nozzles 9 fed, whereby a rapid introduction of the fresh acid to the Band is guaranteed, which causes an increased pickling intensity.

Die Erfindung ist nicht durch die dargestellten Ausführungen beschränkt, insbesondere können auch die Düsen in Bandlaufrichtung oder gegen die Bandlaufrichtung gerichtet sein. Es kann ebenfalls eine Abdeckhaube über der Beizsektion vorgesehen sein. Weiters können innerhalb einer Beizsektion mehrere separate Beizsäurenkreisläufe vorgesehen sein, bzw. auch mehrere Beizsektionen hintereinander angeordnet sein.The invention is not limited by the embodiments shown, in particular, the nozzles in the direction of tape travel or against the Direction of tape running. It can also have a cover be provided above the pickling section. Furthermore, within one Pickling section several separate pickling acid cycles can be provided, or several pickling sections can also be arranged one behind the other.

Claims (18)

  1. Process for continuous surface treatment and cleaning of meta! strip in a treatment chamber, where the strip runs through the treatment chamber approximately horizontally, pickling liquid is fed to the treatment chamber, with the pickling liquid having a free surface and the surface to be treated in the chamber being subjected to increased shearing force in relation to the pickling liquid, characterised in that the surface is routed through several devices with a cross section continually tapering in the direction of the strip run and in that in the area of application of the increased shearing force, fresh pickling liquid is added and the pickling liquid is swirled in this area.
  2. Process according to claim 1, characterised in that the flow rate of the pickling liquid feed is controlled.
  3. Process according to one of the claims 1 or 2, characterised in that the temperature of the pickling liquid feed is controlled.
  4. Process according to one of the claims 1 to 3, characterised in that the position of the surface to be treated is adjusted by the pickling liquid.
  5. Process according to claim 4, characterised in that the surface to be treated is centred in the devices provided for increasing the shearing force.
  6. Device for continuous surface treatment and cleaning of metal strip, with treatment chamber (1), where the strip (2) runs through the treatment chamber (1) approximately horizontally, with the pickling liquid having a free surface (21), characterised in that there are several devices (8) in the treatment chamber (1) causing an increase of the shearing force between the strip (2) and the pickling liquid in relation to the shearing force resulting from the movement (3) of the strip (2) in the treatment chamber (1), where the devices (8) have an area of continually tapering cross section in the direction of the strip movement, and in that nozzles (9) are provided in the area of the devices (8) which serve for feeding pickling acid.
  7. Device according to claim 6, characterised in that the treatment tank is a pickling tank (1).
  8. Device according to claim 6 or 7, characterised in that the nozzles (9) are arranged after the device (8) seen in the direction of the strip run (3).
  9. Device according to one of the claims 6 to 8, characterised in that the nozzles (9) are arranged ahead of the device (8) seen in the direction of the strip run (3).
  10. Device according to one of the claims 6 to 9, characterised in that the nozzles (9) are provided in the device (8).
  11. Device according to one of the claims 6 to 10, characterised in that the nozzles (9) are arranged below the material strip (2).
  12. Device according to one of the claims 6 to 11, characterised in that the nozzles (9) are arranged above the material strip (2).
  13. Device according to one of the claims 6 to 12, characterised in that the nozzles (9) have openings facing in the direction of the strip run (3).
  14. Device according to one of the claims 6 to 12, characterised in that the nozzles (9) have openings facing in the direction opposite to the strip run (3).
  15. Device according to one of the claims 6 to 14, characterised in that at least one discharge (17, 17') is provided for the pickling liquid, which is connected to nozzles (9) for pickling liquid feed at least at one point in the treatment chamber (1).
  16. Device according to claim 15, characterised in that at least one pump (19,19') is arranged between the discharge (17, 17') and the pickling liquid feed.
  17. Device according to claim 15 or 16, characterised in that at least one heat addition device (20, 20') is arranged between the discharge (17, 17') and the pickling liquid feed.
  18. Device according to claim 17, characterized in that the heat addition device is a heat exchanger (20, 20').
EP95114997A 1994-10-17 1995-09-23 Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip Expired - Lifetime EP0708186B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT1951/94 1994-10-17
AT195194 1994-10-17
AT0195194A AT404601B (en) 1994-10-17 1994-10-17 METHOD AND DEVICE FOR CONTINUOUS SURFACE TREATMENT, ESPECIALLY FOR STICKING AND CLEANING TAPES, EXAMPLE METAL, IN PARTICULAR STEEL TAPES

Publications (2)

Publication Number Publication Date
EP0708186A1 EP0708186A1 (en) 1996-04-24
EP0708186B1 true EP0708186B1 (en) 1999-06-16

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EP95114997A Expired - Lifetime EP0708186B1 (en) 1994-10-17 1995-09-23 Process and apparatus for continuous surface treatment, in particular for pickling and cleaning strip

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US (1) US5716455A (en)
EP (1) EP0708186B1 (en)
KR (1) KR100359322B1 (en)
AT (1) AT404601B (en)
AU (1) AU704013B2 (en)
DE (1) DE59506218D1 (en)
FI (1) FI954903A (en)
RU (1) RU2168562C2 (en)
TW (1) TW309543B (en)

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AT407759B (en) * 1997-11-28 2001-06-25 Andritz Patentverwaltung METHOD AND DEVICE FOR SURFACE TREATING TAPES WITH LIQUIDS
US6305096B1 (en) * 1998-03-11 2001-10-23 Mitsubishi Heavy Industries, Ltd. Pickling device
AT408765B (en) * 1999-03-05 2002-03-25 Andritz Ag Maschf PLANT FOR CONTINUOUS TREATMENT OF STEEL TAPES
US6260563B1 (en) * 1999-05-20 2001-07-17 Danieli Technology, Inc. High speed pickling with recycling of acid
US6814089B1 (en) * 2003-06-03 2004-11-09 The Material Works, Ltd. Conditioning liquid cleaning and recycling system for sheet metal conditioning apparatus

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EP0708186A1 (en) 1996-04-24
RU2168562C2 (en) 2001-06-10
AT404601B (en) 1999-01-25
KR960014409A (en) 1996-05-22
DE59506218D1 (en) 1999-07-22
AU3426995A (en) 1996-05-02
AU704013B2 (en) 1999-04-01
US5716455A (en) 1998-02-10
KR100359322B1 (en) 2003-10-22
TW309543B (en) 1997-07-01
FI954903A (en) 1996-04-18
FI954903A0 (en) 1995-10-16
ATA195194A (en) 1998-05-15

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