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EP1156893A1 - Method and device for drying and keeping dry especially cold-rolled strip in the delivery area of cold-rolling and strip-rolling plants - Google Patents

Method and device for drying and keeping dry especially cold-rolled strip in the delivery area of cold-rolling and strip-rolling plants

Info

Publication number
EP1156893A1
EP1156893A1 EP00906331A EP00906331A EP1156893A1 EP 1156893 A1 EP1156893 A1 EP 1156893A1 EP 00906331 A EP00906331 A EP 00906331A EP 00906331 A EP00906331 A EP 00906331A EP 1156893 A1 EP1156893 A1 EP 1156893A1
Authority
EP
European Patent Office
Prior art keywords
strip
band
rolling
belt
partition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00906331A
Other languages
German (de)
French (fr)
Other versions
EP1156893B1 (en
Inventor
Wolfgang Denker
Michael Hanisch
Hans-Peter Richter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1156893A1 publication Critical patent/EP1156893A1/en
Application granted granted Critical
Publication of EP1156893B1 publication Critical patent/EP1156893B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B08B5/023—Cleaning travelling work
    • B08B5/026—Cleaning moving webs

Definitions

  • the invention relates to a method and an apparatus for drying and keeping dry, in particular of rolled strips (cold strip) up to approx. 10 mm thick, preferably less than 0.2 mm thick, in the outlet area of cold rolling and strip plants in which to separate the "Moisture room" of the rolling mill opposite the further Auslauf erei ch behind the last rolling stand "drying room” a partition is arranged, the upper part of which adjoins the platform up to the stand and the lower part below the band to the base plate.
  • the required quality of the "cold strip" product in the outlet of rolling mills is also dryness and cleanliness of the strip surface, since otherwise surface defects, such as stains, are unavoidable during further processing of the strip.
  • DE 28 44 434 A1 proposes to suck off liquid residues from sheets and strips running through, in particular in rolling mills and strip treatment systems, in a defined area across the sheet surface by means of a vacuum generated by means of suction pipes or by means of the suction air streams generated thereby. Sealing lips made of rubber, plastic or brushes are attached to the side of the suction pipes, which have a longitudinal slot, and seal the suction area laterally against the belt.
  • DE 44 22 422 A1 discloses a device for the contact-free sealing of a gap between a partition and a work roll in the outlet of a roll stand.
  • the end of the bulkhead lies contactlessly with a small gap-like spacing approximately tangentially on the surface of the work roll.
  • the gap formed in this way between the partition and the work roll is sealed with a high-energy flow (by means of compressed air) emerging from a gap nozzle arranged in the end part of the partition.
  • the negative pressure caused by this flow due to the tapering formation of the end part and its arrangement relative to the work roll causes large amounts of air to be additionally sucked in through the gap and flow in the direction of the wet area towards the work roll. This creates a defined flow between the bulkhead and the rolling stock, in the area of which wet air with drops and others. Particles is suctioned off.
  • partitioning for keeping cold strip dry in the outlet of a roll stand with means for repelling liquid rolling medium and / or for removing spray or spray liquid adhering to surfaces of the strip is described in DE 195 35 168 A1.
  • the bulkhead consisting of a permanently installed part and a moving part arranged on the belt side (to enable easy roll change), extends above the belt outlet to the scaffolding platform and below the belt outlet to the base plate.
  • the following device parts are arranged on the movable part of the partition:
  • bale gap seal designed to seal the roll space located above the belt against the belt
  • a strip edge blow-off designed to generate an air flow perpendicular to the strip in the outgoing roller gap above the strip run, by means of which the entrained roller oil is deflected from the strip at the side of the strip edges
  • a fume extractor designed to generate a parallel air flow against the belt running direction above and below the belt.
  • the invention has for its object to form a simple method and a device based thereon from simple and rolling mill-compatible components for the contactless sealing of a gap between a partition and a strip in the outlet of cold rolling and strip systems in such a way that with reasonable energy expenditure and Low noise development, both a dry strip surface and a complete separation of the wet-wet roll area from the finished rolled strip is achieved by further development of the known devices.
  • the object is achieved in terms of method in a method of the type mentioned in the preamble of claim 1 by the characterizing measures of claim 1 and in terms of the device with the characterizing features of claim 3.
  • the compressed gas above and below the strip additionally in the form of a spa flow parallel to the strip surface in the direction of the rolling mill and in the opposite direction is carried out, penetration of rolling oil or emulsion is successfully prevented even at high belt speeds of over 1000 m per minute, regardless of the belt width, and contactless belt drying is achieved.
  • the gap flow which runs parallel to the strip surface also reliably prevents rolling oil or emulsion from penetrating to the side of the strip. Also running down at the top bulkhead Liquid is specifically returned to the rolling mill through this gap flow.
  • the pressure at which the gas is guided at right angles from above and below against the belt surface is approximately 1 to 10 bar, preferably approximately 5 bar, which ensures that the construction of an air cushion-like compressed gas cushion is carried out for the optimal sealing and the subsequent one Crevice flow is energetic enough to prevent moisture penetration.
  • the gap between the partition and the band is preferably set to 0.1 to 1 mm, preferably to 0.2 mm plus the band thickness, in order to keep the gas quantities as low as possible for a given gas pressure to achieve the desired effect.
  • a device for carrying out this method consists of a partition arranged above and below the belt, the stationary parts of which connect above the belt to the scaffolding platform and below the belt to the base plate.
  • these permanently installed bulkhead parts are extended so far by movable (movable) bulkhead parts that a narrow gap is set between these movable bulkhead parts and the surface of the band.
  • This gap can be set to a predetermined gap width by moving the movable bulkhead parts against a fixed or adjustable stop, or it adjusts itself automatically due to the compressed gas cushion.
  • it is 0.1 to 1 mm, preferably 0.2 mm, regardless of the strip thickness.
  • the hinge-side end of the movable partition is formed by a blow nozzle bar, into which holes (blow nozzles) are arranged, through which a gas is guided with pressure against the belt surface.
  • a blow nozzle bar into which holes (blow nozzles) are arranged, through which a gas is guided with pressure against the belt surface.
  • approximately 250 blowing nozzles with a diameter of approximately 1 mm are arranged in the blowing nozzle strip per meter of strip length.
  • the blowing nozzles are advantageously arranged one behind the other across the entire bandwidth in the center of the blowing nozzle strip.
  • blow nozzle bars - their length corresponds at least to the bandwidth and their width is about 10 to 500 mm, preferably about 60 mm, and the blow nozzle bar side formed parallel to the belt surface is in the middle (in relation to the blow nozzle bar pulp) te)
  • Compressed gas emerging from the blowing nozzles is able to build up the air cushion-like compressed gas cushion required for reliable sealing.
  • the band-side blow nozzle line due to the broad design of the band-side blow nozzle line, the width of which extends significantly beyond the area of the blow nozzle openings and which runs parallel to the band surface, the gap to be sealed in the direction of the band length is wide enough to ensure a reliably acting gap flow parallel to the band surface towards the rolling mill and in the opposite direction with the help of the compressed gas.
  • FIG. 1 in side view in a detail
  • FIG. 2 shows a schematic enlargement of the blow nozzle strips according to FIG. 1.
  • the bulkhead 12, 13 opens into a frame 14, 15 on the hinge side, which is likewise arranged in a stationary manner or is designed to be movable and in which movable blower nozzle carriers 16, 16 ', 17, 17' are arranged.
  • the hinge-side termination of the partition 12, 13 with the blow nozzle carriers 16, 16 *, 17, 17 ' form the blow nozzle strips 18, 19 with centrally arranged blow nozzles 23 in the form of bores which are fastened on the hinge side to the blow nozzle carriers 16 *, 17' and due to the movable arrangement of the frame 14, 15 and the movable Arrangement of the blow nozzle carrier 16, 16 ', 17, 17' can be moved up to the band 10.
  • An adjustable or permanently installed stop 20 ensures that a certain gap width between the blowing nozzle strips 18, 19 and the surface of the belt 10 can be adjusted or adjusts itself automatically due to the compressed gas cushion, whereby this gap is thus made possible by the ability of the blowing nozzle to be moved can also be adapted to different strip thicknesses.
  • the blow nozzle strips 18, 19 form chambers 24, 25, 26, 27, specifically inner chambers 24, 25 and outer chambers 26, 27, which pass through the chamber openings 28 , 29 are connected.
  • the inner chambers 24, 25 can be filled with the pressurized gas via inlet openings 21, 22, which then flows into the outer chambers 26, 27 via the chamber openings 28, 29 and is guided from there via the blow nozzles 23 perpendicularly to the surface of the belt 10.
  • the formation of chambers above or below the blowing nozzle strip advantageously creates a reservoir and an equalization for the compressed gas.
  • FIG. 2 shows the resulting flow directions of the compressed gas, starting only from the outer chambers 26, 27, in a schematic enlargement.
  • the components of FIG. 2 are shown very schematically and differ in shape from the components of FIG. 1, the same reference numerals have been chosen for better understanding of the same components.
  • the device according to the invention functions as follows: compressed gas 33 flows out of the inner chambers 24, 25 (the chambers are not shown in FIG. 2) through the chamber openings 28, 29 into the outer chambers 26, 27 and from there through the blowing nozzles 23 perpendicular to the surfaces of the band 10 and here forms a compressed gas cushion above and below the band 10 in the gap 30.
  • the pressure gas 33 divides in the gap 30 and flows in a gap flow 32 to the damp room 35 of the roll stand (to the right in FIG. 2) and in the opposite direction as a gap flow 31 to the drying chamber 34 of the finished rolled strip (to the left in FIG. 2).
  • the fact that the blowing nozzle strips 18, 19 are formed with a wide band-side blowing nozzle strip surface parallel to the strip surface results in a gap corresponding to the width of the blowing nozzle strips, so that the desired gap flow 31, 32 can also be established here.
  • the partition 12, 13 is also shown schematically in FIG. 2 to indicate that the interaction of the partition with the pressurized gas cushion and the gap flow 31, 32 separates the drying chamber 34 from the damp strip 35 with the finished rolled strip of the rolling stand is reached.
  • Blower nozzle strips the number and arrangement of the blower nozzles and the design of the blower nozzle carrier differ from the example shown, if the basic principle of the invention, the formation of an air cushion-like compressed gas cushion with a gap flow on both surface sides of the belt is retained.
  • the compressed gas chambers formed above or below the blow nozzle bar are not absolutely necessary in order to To carry out the subject of the invention.
  • the inventive method and the device are also suitable for drying and keeping dry for any profiles. The corresponding design adjustment is at the discretion of the person skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Metal Rolling (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Laminated Bodies (AREA)

Abstract

According to known methods for drying and keeping dry especially rolled strips (10), the dry area (34) of the finished rolled strip is separated from the damp area (35) of the rolling stand by a partition (12, 13; 14, 15). According to the invention, a contactless seal is created between the partition (12, 13; 14, 15) and the strip (10) by means of a compressed gas buffer which is similar to an air cushion and a split flow (31, 32). Compressed gas (33) is guided onto the strip surfaces at a right angle from above and below, from the nozzle lips (18, 19) of a number of blast nozzles (23).

Description

Verfahren und Vorrichtung zum Trocknen und Trockenhalten von insbesondere Kaltband im Auslauf ereich von Kaltwalz- und Bandanlagen Method and device for drying and keeping dry, in particular, cold strip in the outlet area of cold rolling and strip systems
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Trocknen und Trockenhalten, insbesondere von gewalzten Bändern (Kaltband) bis ca. 10 mm Dicke, vorzugsweise kleiner als 0,2 mm Dicke, im Auslauf ereich von Kaltwalz- und Bandanlagen, in denen zur Abtrennung des "Feuchtraums" des Walzwerks gegenüber dem weiteren Aus Lauf erei ch hinter dem letzten Walzgerüst "Trockenraum" eine Abschottung angeordnet ist, deren oberer Teil oberhalb des Bandes bis an die Gerüstbühne und deren unterer Teil unterhalb des Bandes bis an die Grundplatte anschl ießt .The invention relates to a method and an apparatus for drying and keeping dry, in particular of rolled strips (cold strip) up to approx. 10 mm thick, preferably less than 0.2 mm thick, in the outlet area of cold rolling and strip plants in which to separate the "Moisture room" of the rolling mill opposite the further Auslauf erei ch behind the last rolling stand "drying room" a partition is arranged, the upper part of which adjoins the platform up to the stand and the lower part below the band to the base plate.
Im Auslauf von Walzwerken ist die geforderte Qualität des Produktes "Kaltband" neben guter PLanheit und optimaler Dickentoleranz auch Trockenheit und Sauberkeit der Bandoberfläche, da anderenfalls bei der Weiterverarbeitung des Bandes Oberflächenfehler, beispielsweise Flecken, unvermeidlich sind.In addition to good flatness and optimum thickness tolerance, the required quality of the "cold strip" product in the outlet of rolling mills is also dryness and cleanliness of the strip surface, since otherwise surface defects, such as stains, are unavoidable during further processing of the strip.
Um eine trockene Bandoberfläche zu erhalten und diese gegenüber dem Nassbereich des Walzwerks abzuschirmen und so vor erneuter Befeuchtung zu schützen, beispielsweise durch 9 _In order to maintain a dry strip surface and to shield it from the wet area of the rolling mill and thus to protect it from re-moistening, for example by 9 _
unerwünschte Kondensation von vom Walzgerüst ausgehendem Dunst, sind unterschiedliche Vorrichtungen und Maßnahmen bekannt, wie beispielsweise Abschottungen, Absaugen, Abblasen sowie deren Kombinationen.Unwanted condensation of haze emanating from the roll stand, various devices and measures are known, such as foreclosures, suction, blowing off and combinations thereof.
So wird in der DE 28 44 434 A1 vorgeschlagen, Flüssigkeitsreste von durchlaufenden Blechen und Bändern insbesondere in Walzwerken und Bandbehandlungsanlagen in einem definierten Bereich quer über die Blechoberfläche durch mittels Saugrohren erzeugtem Vakuum bzw. durch die dabei erzeugten Saugluftströme abzusaugen. An die mit einem Längsschlitz versehenen Saugrohre sind seitlich Dichtungslippen aus Gummi, Kunststoff oder Bürsten befestigt, die den Saugbereich seitlich gegen das Band abdichten.For example, DE 28 44 434 A1 proposes to suck off liquid residues from sheets and strips running through, in particular in rolling mills and strip treatment systems, in a defined area across the sheet surface by means of a vacuum generated by means of suction pipes or by means of the suction air streams generated thereby. Sealing lips made of rubber, plastic or brushes are attached to the side of the suction pipes, which have a longitudinal slot, and seal the suction area laterally against the belt.
Aus der DE 44 22 422 A1 ist eine Vorrichtung zum berührungsfreien Abdichten eines Spaltes zwischen einer Abschottung und einer Arbeitswalze im Auslauf eines Walzgerüstes bekannt. Das Ende der Abschottung liegt dabei berührungslos mit einem geringen spaltförmigen Abstand annähernd tangential an der Oberfläche der Arbeitswalze an. Der auf diese Weise gebildete Spalt zwischen der Abschottung und der Arbeitswalze wird mit einer aus einer im Endteil der Abschottung angeordneten Spaltdüse austretenden energiereichen Strömung (mittels Druckluft) abgedichtet. Der durch diese Strömung aufgrund der schneidenartig sich verjüngenden Ausbildung des Endteils und seiner Anordnung relativ zur Arbeitswalze hervorgerufene Unterdruck bewirkt, dass zusätzlich große Mengen an Luft durch den Spalt angesaugt werden und in Richtung Nassbereich zur Arbeitswalze hin strömen. Hierdurch bildet sich eine definierte Strömung zwischen Abschottung und Walzgut aus, in deren Bereich die nasse Luft mit Tropfen und anderen. Part ikeln abgesaugt wird.DE 44 22 422 A1 discloses a device for the contact-free sealing of a gap between a partition and a work roll in the outlet of a roll stand. The end of the bulkhead lies contactlessly with a small gap-like spacing approximately tangentially on the surface of the work roll. The gap formed in this way between the partition and the work roll is sealed with a high-energy flow (by means of compressed air) emerging from a gap nozzle arranged in the end part of the partition. The negative pressure caused by this flow due to the tapering formation of the end part and its arrangement relative to the work roll causes large amounts of air to be additionally sucked in through the gap and flow in the direction of the wet area towards the work roll. This creates a defined flow between the bulkhead and the rolling stock, in the area of which wet air with drops and others. Particles is suctioned off.
Eine weitere Art der Abschottung zum Trockenhalten von Kaltband im Auslauf eines Walzgerüstes mit Mitteln zum Abweisen von flüssigem Walzmedium und/oder zum Entfernen an Oberflächen des Bandes anhaftender Spritz- oder Sprühflüssigkeit wird in der DE 195 35 168 A1 beschrieben. Die Abschottung, bestehend aus einem fest installierten Teil und einem bandseitig angeordneten beweglichen Teil (zur Ermöglichung eines problemlosen Walzenwechselns) , reicht oberhalb des Bandauslaufs bis an die Gerüstbühne und unterhalb des Bandauslaufs bis an die Grundplatte. Am beweglichen Teil der Abschottung sind folgende Vorrichtungsteile angeordnet:Another type of partitioning for keeping cold strip dry in the outlet of a roll stand with means for repelling liquid rolling medium and / or for removing spray or spray liquid adhering to surfaces of the strip is described in DE 195 35 168 A1. The bulkhead, consisting of a permanently installed part and a moving part arranged on the belt side (to enable easy roll change), extends above the belt outlet to the scaffolding platform and below the belt outlet to the base plate. The following device parts are arranged on the movable part of the partition:
- Eine Ba L lenabblasung zum Abweisen von abgequetschtem Walzmedium vom fertiggewalzten Band- A ball blow-off to repel squeezed rolling medium from the finished strip
- eine zur Abdichtung des oberhalb vom Band gelegenen Walzenraums gegen das Band ausgebildete Ballenspaltabdichtung- A bale gap seal designed to seal the roll space located above the belt against the belt
- eine zur Erzeugung einer zum Band rechtwinkligen Luftströmung im aus lauf sei t i gen Walzenspalt oberhalb des Bandlaufs ausgebildete Bandkantenabblasung, durch die das mitgerissene Walzδl seitlich der Bandkanten vom Band abgelenkt wi rd- A strip edge blow-off designed to generate an air flow perpendicular to the strip in the outgoing roller gap above the strip run, by means of which the entrained roller oil is deflected from the strip at the side of the strip edges
- eine zur Erzeugung einer parallelen Luftströmung gegen die Bandlauf richtung oberhalb und unterhalb des Bandes ausgebildete Dunstabsaugung.- A fume extractor designed to generate a parallel air flow against the belt running direction above and below the belt.
Ausgehend von diesem bekannten Stand der Technik, bei der vielfach das Band abgesaugt oder ein Luftstrom gegen die Arbeitswalze gerichtet wird, liegt der Erfindung die Aufgabe zugrunde, ein einfaches Verfahren und eine darauf beruhende Vorrichtung aus einfachen und walzwerksgerechten Bauelementen zum berührungsfreien Abdichten eines Spaltes zwischen einer Abschottung und einem Band im Auslauf von Kaltwalz- und Bandanlagen so auszubilden, dass mit vertretbarem Energieaufwand und geringer Geräuschentwicklung sowohl eine trockene Bandoberfläche als auch eine völlige Abtrennung des feucht-nassen Wa Lzenbereichs vom fertiggewalzten Band durch Weiterentwicklung der bekannten Vorrichtungen erreicht wird.Starting from this known prior art, in which the tape is often sucked off or an air flow against the Work roller is directed, the invention has for its object to form a simple method and a device based thereon from simple and rolling mill-compatible components for the contactless sealing of a gap between a partition and a strip in the outlet of cold rolling and strip systems in such a way that with reasonable energy expenditure and Low noise development, both a dry strip surface and a complete separation of the wet-wet roll area from the finished rolled strip is achieved by further development of the known devices.
Die gestellte Aufgabe wird verfahrensmäßig gelöst bei einem Verfahren der im Oberbegriff des Anspruchs 1 genannten Art durch die kennzeichnenden Maßnahmen des Anspruchs 1 und vorrichtungsmäßig mit den kennzeichnenden Merkmalen des Anspruchs 3.The object is achieved in terms of method in a method of the type mentioned in the preamble of claim 1 by the characterizing measures of claim 1 and in terms of the device with the characterizing features of claim 3.
Durch die Maßnahme der Erfindung, den Spalt zwischen der Abschottung und dem Band oberhalb und unterhalb des Bandes durch ein Luftkissenähnliches Druckgaspolster abzudichten, wobei das Druckgas oberhalb und unterhalb des Bandes zusätzlich in Form einer Spa Ltst römung parallel zur Bandoberfläche in Richtung zum Walzwerk und in Gegenrichtung abgeführt wird, wird auch bei hohen Bandgeschwindigkeiten über 1000 m pro Minute unabhängig von der Bandbreite ein Durchdringen von Walzöl oder auch Emulsion mit Erfolg verhindert und eine berührungslose Bandtrocknung erreicht.By the measure of the invention to seal the gap between the partition and the strip above and below the strip by means of an air cushion-like compressed gas cushion, the compressed gas above and below the strip additionally in the form of a spa flow parallel to the strip surface in the direction of the rolling mill and in the opposite direction is carried out, penetration of rolling oil or emulsion is successfully prevented even at high belt speeds of over 1000 m per minute, regardless of the belt width, and contactless belt drying is achieved.
Durch die sich ausbildende parallel zur Bandoberfläche verlaufende Spaltströmung wird außerdem sicher verhindert, dass seitlich des Bandes Walzöl bzw. Emulsion durchdringt. Auch an der oberen Abschottung nach unten ablaufende Flüssigkeit wird durch diese Spaltströmung gezielt zum Walzwerk zurückgeführt.The gap flow which runs parallel to the strip surface also reliably prevents rolling oil or emulsion from penetrating to the side of the strip. Also running down at the top bulkhead Liquid is specifically returned to the rolling mill through this gap flow.
Der Druck, mit dem das Gas hierbei rechtwinklig von oben und von unten gegen die Bandoberfläche geführt wird, beträgt etwa 1 bis 10 bar, vorzugsweise etwa 5 bar, was sicherstellt, dass der für eine optimale Abdichtung erforderliche Aufbau eines luftkissenähnlichen Druckgaspolsters erfolgt und die anschließende Spaltströmung energiereich genug ist, um ein Durchdringen von Feuchtigkeit zu verhindern. Damit dies auch mit möglichst geringer Energie und Geräuschentwicklung ermöglicht wird, ist der Spalt zwischen der Abschottung und dem Band möglichst auf 0,1 bis 1 mm, vorzugsweise auf 0,2 mm zuzüglich der Banddicke eingestellt, um bei vorgegebenem Gasdruck mit möglichst geringen Gasmengen den gewünschten Effekt zu erzielen.The pressure at which the gas is guided at right angles from above and below against the belt surface is approximately 1 to 10 bar, preferably approximately 5 bar, which ensures that the construction of an air cushion-like compressed gas cushion is carried out for the optimal sealing and the subsequent one Crevice flow is energetic enough to prevent moisture penetration. So that this is made possible with the lowest possible energy and noise development, the gap between the partition and the band is preferably set to 0.1 to 1 mm, preferably to 0.2 mm plus the band thickness, in order to keep the gas quantities as low as possible for a given gas pressure to achieve the desired effect.
Eine Vorrichtung zur Durchführung dieses Verfahrens besteht aus einer oberhalb und unterhalb des Bandes angeordneten Abschottung, deren ortsfest installierte Teile oberhalb des Bandes bis an die Gerüstbühne und unterhalb des Bandes bis an die Grundplatte anschließen. Zur Bandseite hin sind diese fest installierten Abschottungsteile durch bewegliche (verfahrbare) Abschottungsteile so weit verlängert, dass zwischen diesen beweglichen Abschottungsteilen und der Bandoberfläche ein enger Spalt eingestellt ist. Dieser Spalt kann durch Verfahren der beweglichen Abschottungsteile gegen einen festen oder einstellbaren Anschlag auf eine vorbestimmte Spaltweite eingestellt werden oder er stellt sich selbsttätig aufgrund des Druckgaspolsters ein. Nach einer vorteilhaften Ausgestaltung der Erfindung beträgt er, unabhängig von der Banddicke 0,1 bis 1 mm, vorzugsweise 0,2 mm. Das bandseitige Ende der beweglichen Abschottung wird jeweils durch eine Blasdüsenleiste gebildet, in die Bohrungen (Blasdüsen) angeordnet sind, durch die ein Gas mit Druck gegen die Bandoberfläche geführt wird. Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung sind in der Blasdüsenleiste pro Meter Leistenlänge ca. 250 Blasdüsen mit einem Durchmesser von ca. 1 mm angeordnet. Vorteilhaft sind hierbei die BLasdüsen hintereinander quer über die gesamte Bandbreite mittig in der Blasdüsenleiste angeordnet. Es ist aber auch möglich, statt der Blasdüsen-Bohrungen eine durchgehende Schlitzdüse mit einer Schlitzweite von beispielsweise 1 mm in der Blasdüsenleiste auszubilden.A device for carrying out this method consists of a partition arranged above and below the belt, the stationary parts of which connect above the belt to the scaffolding platform and below the belt to the base plate. Towards the hinge side, these permanently installed bulkhead parts are extended so far by movable (movable) bulkhead parts that a narrow gap is set between these movable bulkhead parts and the surface of the band. This gap can be set to a predetermined gap width by moving the movable bulkhead parts against a fixed or adjustable stop, or it adjusts itself automatically due to the compressed gas cushion. According to an advantageous embodiment of the invention, it is 0.1 to 1 mm, preferably 0.2 mm, regardless of the strip thickness. The hinge-side end of the movable partition is formed by a blow nozzle bar, into which holes (blow nozzles) are arranged, through which a gas is guided with pressure against the belt surface. According to a further advantageous embodiment of the invention, approximately 250 blowing nozzles with a diameter of approximately 1 mm are arranged in the blowing nozzle strip per meter of strip length. The blowing nozzles are advantageously arranged one behind the other across the entire bandwidth in the center of the blowing nozzle strip. However, it is also possible to form a continuous slot nozzle with a slot width of, for example, 1 mm in the blowing nozzle bar instead of the blowing nozzle bores.
Durch die Größe der Blasdüsen Lei ste - ihre Länge entspricht mindestens der Bandbreite und ihre Breite beträgt etwa 10 bis 500 mm, vorzugsweise etwa 60 mm sowie der parallel zur Bandoberfläche ausgebildeten bandseitigen B lasdüsen Lei stenf l che ist das mittig (in Bezug auf die Blasdüsenleistenbrei te) aus den Blasdüsen austretende Druckgas in der Lage, das für eine zuverlässige Abdichtung erforderliche luf tkissenf ör ige Druckgaspolster aufzubauen. Weiterhin wird durch die breite Ausbildung der bandseitigen Blasdüsenlei stenf lache, deren Breite deutlich über den Bereich der Blasdüsenδf fnungen hinausgeht und die parallel zur Bandoberfläche verläuft, erreicht, dass der abzudichtende Spalt in Richtung Bandlänge breit genug ist, um eine zuverlässig wirkende Spaltströmung parallel zur Bandoberfläche in Richtung zum Walzwerk und in Gegenrichtung mit Hilfe des Druckgases aufrecht zu erhalten.Due to the size of the blow nozzle bars - their length corresponds at least to the bandwidth and their width is about 10 to 500 mm, preferably about 60 mm, and the blow nozzle bar side formed parallel to the belt surface is in the middle (in relation to the blow nozzle bar pulp) te) Compressed gas emerging from the blowing nozzles is able to build up the air cushion-like compressed gas cushion required for reliable sealing. Furthermore, due to the broad design of the band-side blow nozzle line, the width of which extends significantly beyond the area of the blow nozzle openings and which runs parallel to the band surface, the gap to be sealed in the direction of the band length is wide enough to ensure a reliably acting gap flow parallel to the band surface towards the rolling mill and in the opposite direction with the help of the compressed gas.
Weitere Vorteile, Einzelheiten und Merkmale der Erfindung werden nachfolgend anhand eines in Zeichnungsfiguren dargestellten Ausführungsbeispiels näher erläutert.Further advantages, details and features of the invention are explained in more detail below with reference to an embodiment shown in the drawing figures.
Es zeigen:Show it:
Fig. 1 in Seitenansicht in einem Ausschnitt dieFig. 1 in side view in a detail
Abschottung und Spaltabdichtung am Auslauf eines Walzgerüstes (teilgeschnitten),Partitioning and gap sealing at the outlet of a rolling stand (partially cut),
Fig. 2 eine schematische Ausschni ttvergrößung der Blasdüsenleisten gemäß Fig. 1.FIG. 2 shows a schematic enlargement of the blow nozzle strips according to FIG. 1.
In Figur 1 ist der Aus laufbereich eines Walzgerüstes (das Walzgerüst wurde nicht eingezeichnet, es befindet sich rechts neben Fig. 1) mit dem Band 10, das in Pfeilrichtung 11 transportiert wird, schematisch dargestellt.In Figure 1, the run-out area of a roll stand (the roll stand was not shown, it is located to the right of Fig. 1) with the belt 10, which is transported in the direction of arrow 11, is shown schematically.
Oberhalb und unterhalb des Bandes 10 befindet sich eine ortsfest installierte Abschottung 12, 13, deren oberer Teil 12 bis an die Gerüstbühne reicht (nicht dargestellt) und deren unterer Teil 13 zwecks Rücklauf von abgeschiedener Flüssigkeit schräg nach unten in Richtung Walzgerust verläuft. Die Abschottung 12, 13 mündet bandseitig in einen Rahmen 14, 15, der gleichfalls ortsfest angeordnet oder aber verfahrbar ausgebildet ist und in dem verfahrbare Blasdüsenträger 16, 16', 17, 17' angeordnet sind. Den bandseitigen Abschluss der Abschottung 12, 13 mit den Blasdüsenträgern 16, 16*, 17, 17' bilden die Blasdüsenleisten 18, 19 mit mittig angeordneten Blasdüsen 23 in Form von Bohrungen, die bandseitig an den Blasdüsenträgern 16*, 17' befestigt sind und die durch die verfahrbare Anordnung des Rahmens 14, 15 und die verfahrbare Anordnung der Blasdüsenträger 16, 16', 17, 17' bis dicht an das Band 10 herangefahren werden können. Ein einstellbarer oder fest installierter Anschlag 20 gewährleistet, dass eine bestimmte Spaltweite zwischen den Blasdüsenleisten 18, 19 und der Oberfläche des Bandes 10 dabei einstellbar ist oder sich selbsttätig aufgrund des Druckgaspolsters einstellt, wobei durch die Möglichkeit der Verfahrbarkei t der Blasdüsen Lei sten dieser Spalt somit auch an unterschiedliche Banddicken angepasst werden kann. Gemeinsam mit den Bauteilen der Blasdüsenträger 16, 16', 17, 17' bilden die Blasdüsenleisten 18, 19 Kammern 24, 25, 26, 27 aus, und zwar innere Kammern 24, 25 und äußere Kammern 26, 27, die über die Kammeröffnungen 28, 29 miteinander in Verbindung stehen. Die inneren Kammern 24, 25 sind mit dem Druckgas über Eintrittsöffnungen 21, 22 befullbar, welches dann über die Kammeröffnungen 28, 29 in die äußeren Kammern 26, 27 einströmt und von dort über die Blasdüsen 23 senkrecht auf die Oberfläche des Bandes 10 geführt wird. Durch die Ausbildung von Kammern oberhalb bzw. unterhalb der Blasdüsenleiste wird mit Vorteil ein Reservoir sowie eine Vergleichmäßigung für das Druckgas geschaffen.Above and below the belt 10 there is a permanently installed partitioning 12, 13, the upper part 12 of which extends to the scaffolding platform (not shown) and the lower part 13 of which runs obliquely downwards in the direction of the roll stand for the purpose of returning separated liquid. The bulkhead 12, 13 opens into a frame 14, 15 on the hinge side, which is likewise arranged in a stationary manner or is designed to be movable and in which movable blower nozzle carriers 16, 16 ', 17, 17' are arranged. The hinge-side termination of the partition 12, 13 with the blow nozzle carriers 16, 16 *, 17, 17 'form the blow nozzle strips 18, 19 with centrally arranged blow nozzles 23 in the form of bores which are fastened on the hinge side to the blow nozzle carriers 16 *, 17' and due to the movable arrangement of the frame 14, 15 and the movable Arrangement of the blow nozzle carrier 16, 16 ', 17, 17' can be moved up to the band 10. An adjustable or permanently installed stop 20 ensures that a certain gap width between the blowing nozzle strips 18, 19 and the surface of the belt 10 can be adjusted or adjusts itself automatically due to the compressed gas cushion, whereby this gap is thus made possible by the ability of the blowing nozzle to be moved can also be adapted to different strip thicknesses. Together with the components of the blow nozzle carrier 16, 16 ', 17, 17', the blow nozzle strips 18, 19 form chambers 24, 25, 26, 27, specifically inner chambers 24, 25 and outer chambers 26, 27, which pass through the chamber openings 28 , 29 are connected. The inner chambers 24, 25 can be filled with the pressurized gas via inlet openings 21, 22, which then flows into the outer chambers 26, 27 via the chamber openings 28, 29 and is guided from there via the blow nozzles 23 perpendicularly to the surface of the belt 10. The formation of chambers above or below the blowing nozzle strip advantageously creates a reservoir and an equalization for the compressed gas.
In Figur 2 sind die sich ergebenden Strömungsrichtungen des Druckgases, ausgehend nur von den äußeren Kammern 26, 27, in einer schematischen Ausschnittsvergrößerung dargestellt. Obgleich die Bauteile der Fig. 2 sehr schematisch dargestellt sind und von den Bauteilen der Fig. 1 in ihrer Form abweichen, wurden zum besseren Verständnis für gleiche Bauteile auch gleiche Bezugszeichen gewählt.FIG. 2 shows the resulting flow directions of the compressed gas, starting only from the outer chambers 26, 27, in a schematic enlargement. Although the components of FIG. 2 are shown very schematically and differ in shape from the components of FIG. 1, the same reference numerals have been chosen for better understanding of the same components.
Die erfindungsgemäße Vorrichtung funktioniert folgendermaßen: Druckgas 33 strömt aus den inneren Kammern 24, 25 (die Kammern sind in Fig. 2 nicht dargestellt) durch die Kammeröffnungen 28, 29 in die äußeren Kammern 26, 27 ein und von dort durch die Blasdüsen 23 senkrecht auf die Oberflächen des Bandes 10 und bildet hier im Spalt 30 ein Druckgaspolster oberhalb und unterhalb des Bandes 10 aus. Im Spalt 30 teilt sich das Druckgas 33 auf und fließt in einer Spaltströmung 32 zum Feuchtraum 35 des Walzgerüstes (in Fig. 2 nach rechts) und in Gegenrichtung als Spaltströmung 31 zum Trockenraum 34 des fertig gewalzten Bandes (in Fig. 2 nach links). Dadurch, dass die Blasdüsenleisten 18, 19 mit einer breiten bandseitigen Blasdusenleistenf lache parallel zur Bandoberfläche ausgebildet sind, ergibt sich ein der Breite der Blasdüsenleisten entsprechend langer Spalt, so dass sich hier auch die gewünschte Spaltströmung 31, 32 aufbauen kann.The device according to the invention functions as follows: compressed gas 33 flows out of the inner chambers 24, 25 (the chambers are not shown in FIG. 2) through the chamber openings 28, 29 into the outer chambers 26, 27 and from there through the blowing nozzles 23 perpendicular to the surfaces of the band 10 and here forms a compressed gas cushion above and below the band 10 in the gap 30. The pressure gas 33 divides in the gap 30 and flows in a gap flow 32 to the damp room 35 of the roll stand (to the right in FIG. 2) and in the opposite direction as a gap flow 31 to the drying chamber 34 of the finished rolled strip (to the left in FIG. 2). The fact that the blowing nozzle strips 18, 19 are formed with a wide band-side blowing nozzle strip surface parallel to the strip surface results in a gap corresponding to the width of the blowing nozzle strips, so that the desired gap flow 31, 32 can also be established here.
Zum weiteren Verständnis ist in Fig. 2 schematisch die Abschottung 12, 13 mit eingezeichnet, um kenntlich zu machen, dass durch das Zusammenwirken der Abschottung mit dem Druckgaspolster und der Spaltströmung 31, 32 eine Abtrennung des Trockenraums 34 mit dem fertig gewalzten Band von Feuchtraum 35 des Walzgerüstes erreicht wird.For further understanding, the partition 12, 13 is also shown schematically in FIG. 2 to indicate that the interaction of the partition with the pressurized gas cushion and the gap flow 31, 32 separates the drying chamber 34 from the damp strip 35 with the finished rolled strip of the rolling stand is reached.
Das in den Zeichnungsfiguren dargestellte Ausführungsbeispiel stellt nur eine mögliche Anwendung der Erfindung dar. So ist es beispielsweise möglich, die Ausbildung derThe embodiment shown in the drawing figures represents only one possible application of the invention. For example, it is possible to design the
Blasdüsenleisten, die Anzahl und Anordnung der Blasdüsen sowie die Ausbildung der Blasdüsenträger abweichend vom dargestellten Beispiel auszuführen, wenn damit das Grundprinzip der Erfindung, die Ausbildung eines luftkissenähnlichen Druckgaspolsters mit einer Spaltströmung auf beiden Oberflächenseiten des Bandes erhalten bleibt. Auch die oberhalb bzw. unterhalb der Blasdüsenleiste ausgebildeten Druckgaskammern sind nicht unbedingt erforderlich, um den Gegenstand der Erfindung auszuführen. Daruberhinaus sind das erfindungsgemäße Verfahren sowie dei Vorrichtung auch zum Trocknen und Trockenhalten für beliebige Profile geeignet und anwendbar. Die entsprechende konstruktive Anpassung ist in das Ermessen des Fachmanns gestellt. Blower nozzle strips, the number and arrangement of the blower nozzles and the design of the blower nozzle carrier differ from the example shown, if the basic principle of the invention, the formation of an air cushion-like compressed gas cushion with a gap flow on both surface sides of the belt is retained. The compressed gas chambers formed above or below the blow nozzle bar are not absolutely necessary in order to To carry out the subject of the invention. In addition, the inventive method and the device are also suitable for drying and keeping dry for any profiles. The corresponding design adjustment is at the discretion of the person skilled in the art.

Claims

Ansprüche Expectations
1. Verfahren zum Trocknen und Trockenhalten insbesondere von gewalzten Bändern (Kaltband) bis ca. 10 mm Dicke, vorzugsweise kleiner als 0,2 mm Dicke, im Auslaufbereich von Kaltwalz- und Bandanlagen, in denen zur Abtrennung des Feuchtraums (35) des Walzwerks gegenüber dem weiteren Aus laufbereich hinter dem letzten Walzgerüst, dem Trockenraum (34) eine Abschottung angeordnet ist, deren oberer Teil oberhalb des Bandes (10) bis an die Gerüstbühne und deren unterer Teil unterhalb des Bandes (10) bis an die Grundplatte anschließt, dadurch gekennzeichnet, dass das Band (10) von den bandseitigen Enden der Abschottungen (12, 13) und deren Bauteilen (14, 15, 16, 16', 17, 17') aus über Blasdüsen (23) rechtwinklig zur Bandoberfläche von oben und von unten mit einem Gas, vorzugsweise Luft, unter Druck beaufschlagt wird, so dass sich über die gesamte Bandbreite ein luftkissenähnliches Druckgaspolster im 0,1 bis 1 mm, vorzugsweise 0,2 mm weiten Spalt (30) zwischen dem bandseitigen Ende der Abschottung (12, 13; 14, 15) und der oberen und unteren Bandoberfläche aufbaut und das Druckgas (33) oberhalb und unterhalb des Bandes (10) in Form einer Spaltströmung (32) parallel zur Bandober läche in Richtung zum Walzwerk bzw. zum Feuchtraum (35) und einer Spaltströmung (31) in Gegenrichtung zum Trockenraum (34) abgeführt wird.1. A process for drying and keeping dry, in particular, of rolled strips (cold strip) up to approximately 10 mm thick, preferably less than 0.2 mm thick, in the outlet area of cold rolling and strip plants, in which opposite to separate the damp room (35) of the rolling mill From the further run-off area behind the last rolling stand, the drying room (34) is a partition, the upper part of which is connected above the belt (10) to the scaffolding platform and the lower part of which is below the belt (10) to the base plate, characterized that the band (10) from the band-side ends of the partitions (12, 13) and their components (14, 15, 16, 16 ', 17, 17') from blowing nozzles (23) perpendicular to the band surface from above and below is pressurized with a gas, preferably air, so that an air cushion-like compressed gas cushion is located in the 0.1 to 1 mm, preferably 0.2 mm wide gap (30) between the band-side end de over the entire range r Foreclosure (12, 13; 14, 15) and the upper and lower strip surface and the compressed gas (33) above and below the strip (10 ) in the form of a gap flow (32) parallel to the strip surface in the direction of the rolling mill or the wet room (35) and a gap flow (31 ) is discharged in the opposite direction to the drying room ( 34 ) .
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Druckgas (33) mit einem Druck von etwa 1 bis 10 bar, vorzugsweise von etwa 5 bar von unten und oben auf die Bandoberflächen geführt wird. 2. The method according to claim 1, characterized in that the compressed gas (33) with a pressure of about 1 to 10 bar, preferably of about 5 bar from below and above on the belt surfaces.
3. Vorrichtung zur Durchführung des Verfahrens nach den vorherigen Ansprüchen, bestehend aus einer oberhalb und unterhalb des Bandes (10) ortsfest angeordneten Abschottung (12, 13), deren oberer Teil (12) oberhalb des Bandes (10) bis an die Gerüstbühne und deren unterer Teil (13) unterhalb des Bandes (10) bis an die Grundplatte anschließen, sowie einer beweglichen Abschottung (16, 16', 17, 17'), die die ortsfeste Abschottung (12, 13) über Rahmen (14, 15) bis dicht oberhalb und unterhalb der Bandoberfläche verlängert, gekennzeichnet durch am bandseitigen Ende (16', 17') der beweglichen Abschottungen über die gesamte Bandbreite angeordnete Blasdüsenleisten (18, 19) mit senkrecht zur Bandoberfläche ausgerichteten Blasdüsen (23) und bandseitig parallel zur Bandoberfläche ausgebildeten Blasdüsenflächen.3. Device for performing the method according to the preceding claims, consisting of a fixed above and below the band (10) partition (12, 13), the upper part (12) above the band (10) to the scaffolding platform and their Connect the lower part (13) below the belt (10) to the base plate, as well as a movable partition (16, 16 ', 17, 17') that connects the fixed partition (12, 13) to the frame (14, 15) Extended just above and below the hinge surface, characterized by blowing nozzle strips (18, 19) arranged at the hinge-side end (16 ', 17') of the movable partitions over the entire range with blowing nozzles (23) oriented perpendicular to the hinge surface and hinge surfaces parallel to the hinge surface .
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Länge der Blasdüsen Lei sten (18, 19) mindestens der Bandbreite entsprechen und die Breite der Blasdüsenleisten (18, 19) etwa 10 mm bis 500 mm, vorzugsweise etwa 60 mm beträgt.4. The device according to claim 3, characterized in that the length of the blow nozzle Lei most (18, 19) correspond at least to the bandwidth and the width of the blow nozzle strips (18, 19) is about 10 mm to 500 mm, preferably about 60 mm.
5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass in den Blasdüsenleisten (18, 19) pro 1 Blasdüsenlei stenlänge ca. 250 Blasdüsen (23) mit einem Düsendurchmesser von ca. 1 mm angeordnet sind.5. The device according to claim 3 or 4, characterized in that in the blow nozzle strips (18, 19) per 1 Blasdüsenlei stenlänge about 250 blow nozzles (23) are arranged with a nozzle diameter of about 1 mm.
6. Vorrichtung nach Anspruch 3, 4 oder 5, dadurch gekennzeichnet, dass die Blasdüsen (23) in den Blasdüsenleisten (18, 19) mittig bezüglich der Blasdüsenleistenbrei te und hintereinander quer über die gesamte Bandbreite angeordnet sind. 6. The device according to claim 3, 4 or 5, characterized in that the blow nozzles (23) in the blow nozzle strips (18, 19) te in the middle with respect to the blow nozzle strips and are arranged one behind the other across the entire bandwidth.
7. Vorrichtung nach einem oder mehreren der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass der zwischen den Oberflächen des Bandes (10) und den bandseitigen Blasdusenleistenf lachen ausgebildete Spalt (30) eine Weite von 0,1 bis 1,0 mm, vorzugsweise ca. 0,2 mm, aufweist. 7. The device according to one or more of claims 3 to 6, characterized in that the formed between the surfaces of the band (10) and the band-side Blasdusenleistef laugh gap (30) a width of 0.1 to 1.0 mm, preferably approx 0.2 mm.
EP00906331A 1999-03-01 2000-02-16 Method and device for drying and keeping dry especially cold-rolled strip in the delivery area of cold-rolling and strip-rolling plants Expired - Lifetime EP1156893B1 (en)

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DE19908743 1999-03-01
DE19908743A DE19908743A1 (en) 1999-03-01 1999-03-01 Method and device for drying and keeping dry, in particular, cold strip in the outlet area of cold rolling and strip systems
PCT/EP2000/001235 WO2000051757A1 (en) 1999-03-01 2000-02-16 Method and device for drying and keeping dry especially cold-rolled strip in the delivery area of cold-rolling and strip-rolling plants

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CN1342108A (en) 2002-03-27
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US6834521B1 (en) 2004-12-28
EA200100931A1 (en) 2002-02-28
KR20010108279A (en) 2001-12-07
BR0008574A (en) 2002-01-22
ATE238110T1 (en) 2003-05-15
CN1151004C (en) 2004-05-26
JP2002538004A (en) 2002-11-12
TR200102526T2 (en) 2002-04-22
DE19908743A1 (en) 2000-09-07
EP1156893B1 (en) 2003-04-23
EA002541B1 (en) 2002-06-27
AU2804800A (en) 2000-09-21
DE50001867D1 (en) 2003-05-28
WO2000051757A1 (en) 2000-09-08

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