EP0028686B1 - Cooling apparatus, especially for ingot and billet strands - Google Patents

Cooling apparatus, especially for ingot and billet strands Download PDF

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Publication number
EP0028686B1
EP0028686B1 EP80105422A EP80105422A EP0028686B1 EP 0028686 B1 EP0028686 B1 EP 0028686B1 EP 80105422 A EP80105422 A EP 80105422A EP 80105422 A EP80105422 A EP 80105422A EP 0028686 B1 EP0028686 B1 EP 0028686B1
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EP
European Patent Office
Prior art keywords
strand
spraying
beams
spray
tubes
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EP80105422A
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German (de)
French (fr)
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EP0028686A1 (en
Inventor
Willi Dipl.-Ing. Wrossok
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MDS Mannesmann Demag Sack GmbH
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MDS Mannesmann Demag Sack GmbH
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Priority to AT80105422T priority Critical patent/ATE5462T1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/124Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246Nozzles; Spray heads

Definitions

  • the invention relates to an adjusting device for so-called spray bars running along the surface of a strand of a continuous casting installation as a carrier for spray tubes directed at the surfaces for applying a cooling medium to the surfaces, e.g. B. water, according to the preamble of claim 1 and is thus based on DE-B1-2 636 666.
  • a cooling medium e.g. B. water
  • the primary solidification of the strand takes place in the mold, which is followed by the secondary cooling and a residual cooling section.
  • the first crystals solidify in the mold and form a thin strand shell or strand skin, which is further developed in the course of secondary cooling by applying a coolant (water, steam, water-air mixture, air) and the associated removal of heat until it has completely solidified.
  • a coolant water, steam, water-air mixture, air
  • the most common coolant namely water, is sprayed onto the free surfaces of the strand between the support elements of the strand guide by means of spray nozzles.
  • the known adjusting device is not suitable for ensuring that it functions reliably. It must be borne in mind that continuous casting plants are provided with a closed cooling chamber encompassing the entire area of the spray cooling in the curved course of the strand guide. The conditions in the cooling chamber during the casting operation are characterized by the cooling water sprayed onto the hot strand. There is a wet steam mixture that has a temperature of approx. 80 to 100 ° Celsius in the area of the roller guide. The non-evaporated cooling water heated by the hot strand overflows all components and leaves deposits on the surfaces of the components due to the pouring powder and the washed-off scale. These conditions lead to considerable damage and impairment of the spindle adjustment device and cause the spindle adjustment to fail within a very short time.
  • the invention uses a handlebar system according to DE-B1-2636666, by means of which individual spray tubes can be adjusted “parallel to themselves” in such a way that a larger distance from the surface of the strand is set with a displacement of the spray tubes outwards for a larger strand width. Since the spray tubes can be adjusted transversely to the longitudinal axis of the strand, a plurality of parallelogram handlebar systems with an adjustment drive via nut and spindle are required over the entire length of the strand guide. The same applies to handlebar systems based on the "Nuremberg Scissors" principle according to US-A-4 031 946.
  • the known adjustment devices can also be used for spray bars which, according to DE-A-1 936 306, extend in the longitudinal direction of the strand axis.
  • two parallelogram handlebar systems or two Nuremberg scissors with adjustment drives via nut and spindle would always be required for each spray bar, which does not eliminate the susceptibility of the continuous caster to failure.
  • the use of these systems for spraying the side surfaces of the strand would further increase the susceptibility to faults.
  • the object of the invention is to improve the operational safety of a continuous casting installation and to provide an adjustment device for the spray bars of a continuous casting installation which is free of faults, simple and which can be used in the same way for lateral spraying bars which are assigned to a continuous surface, the center of which shifts with changing width of the strand surface, especially for block and billet continuous casting plants.
  • this object is achieved in that all the spray bars arranged on the four sides of the strand and extending along the surface of the strand are supported by at least two steering levers such that the spray bars move in the direction of the longitudinal axis of the strand when the distance changes the steering levers of the lateral spray bars, which are assigned to a strand surface, the center of which shifts with changing width of the strand surface, can be pivoted in inclined planes which form an acute angle with the respective spray plane running perpendicularly to the assigned strand surface through the spray tubes, such that with the Change in distance of the spray bars is accompanied by a transverse displacement of the spray bars together with the spray pipes relative to the longitudinal axis of the strand.
  • the invention uses the same, simple and robust handlebar system for all four circumferentially distributed spray bars or spray bar zones, which manages with two links per spray bar, because their swivel plane is transverse to the assigned strand surface or - for the side spray bars - around the acute angle from the transverse plane deviates.
  • the invention makes it possible to provide long spray bars which extend over the entire area of the secondary cooling and can only be adjusted to changing distances from the assigned strand surface by means of an adjusting lever, which can also be one of the two steering levers.
  • the adjusting levers are pivoted by an operator or mechanically, in a very simple manner until a hole in the adjusting lever, which is provided with several holes defining the spacing of the spray bar for each individual strand format in accordance with the strand formats to be cast, a correspondence hole of the Strand guide structure is opposite.
  • a bolt By inserting a bolt into the holes, the pre-selected distance of the spray bars with the spray nozzles to the strand surface is reached in a very short time without any further adjustment activity.
  • the same simple adjustment option is also available for the side spray bars, which, due to the oblique arrangement of the steering levers at an acute angle to the strand surface, adjust themselves to the center of the strand format when changing the distance, since they still move transversely to the strand longitudinal axis when moving in the strand longitudinal axis run so that the edge areas of the strand can remain unaffected by the water, which is desirable, and the spray tubes are in the middle of the strand. A center-oriented change in distance has thus been achieved for the side spray bars.
  • continuous spray bars extending over the entire secondary cooling section of a continuous casting installation are further provided that the spray tubes carried by the spray bars increasingly have a shorter distance from the strand surface in the direction of the strand feed.
  • the secondary cooling section of a continuous caster can be divided into cooling zones, which can be switched independently of one another taking into account the steel quality to be cast, although it may well be the case that spray cooling is no longer necessary in the lowest cooling zone (s) and this zone is therefore switched off can be. It is certainly no longer necessary to apply cooling water to the strand in the lowest cooling zones, where it has become more and more solidified, and is sometimes harmful.
  • the spray tubes of different lengths take this fact into account.
  • the shorter spray tubes at the beginning of the cooling section with a predominantly liquid strand core enable a z. B. 80% exposure to the strand surface, while in the lower cooling area the spray angle is significantly narrowed by the longer spray tubes with a smaller distance to the strand surface, so that here z. B. there is only a 40% exposure to the strand area.
  • steel flows from an intermediate container (not shown) into a continuous casting mold or chill mold 2.
  • the chill mold 2 is followed by the strand guide frame 3, which comprises the strand 4 already solidified below the mold in the edge zones with the support rollers 3a arranged in the strand guide frame leads and transferred into the circular arc of the continuous caster.
  • the strand With the exit from the mold 2, where the strand 4 is primarily cooled, the strand reaches the part of the continuous casting plant referred to as the secondary cooling section.
  • the secondary cooling section During its passage through the support rollers 3a of the cooling section, heat is extracted from the strand 4 by water sprayed on by means of spray tubes or nozzles 6.
  • spray bars 7, 8, 9, 10 extending over the entire length of the secondary cooling section are provided on the top and bottom of the strand as well as on the two other sides of the strand.
  • the secondary cooling section can also be divided into cooling zones 5.
  • the spray bars carry a large number of spray tubes 6, which must always be centered on the strand 4.
  • each spray bar 7, 8, 9, 10 which have a connection to a water supply via lines not shown, are connected to the strand guide or back-up roll stand 3 via a plurality of steering levers 12, 12 'pivotably mounted by means of bolts 11 in the manner of a parallelogram steering system .
  • each spray bar can be changed in its distance from the strand surface by means of a pivotable adjusting lever 14, as is the case in FIG. 1 for the spray bar 7 on the underside of the strand and for the spray bar 9 on the top of the strand with the spray bar positions 7 ′ removed from the strand 4. , 9 'is shown.
  • the spray tubes 6 With increasing solidification of the strand 4, the spray tubes 6 have a greater length, so that the distance A of the spray tubes to the strand surface in the lower region of the strand guide is less than the distance A 'in the upper part of the strand guide. This measure makes it possible to reduce the spray angle and thus the cooling surface S acted on the strand surface with increasing solidification of the strand.
  • the lateral steering levers 12 are pivotally arranged in an inclined plane E which extends at a certain angle x obliquely to the spray tube plane F running perpendicular to the assigned strand surface.
  • the side spray bars 8, 10, as shown in Fig. 2 in full lines are set closely, and the spray tubes 6 are only a small distance from the strand surface, which is designed so that the spray cone with the Base area S does not cover the edge areas of the strand.
  • the dashed lines 8, 10 with the spray tubes 6 shown in broken lines are far from the surface of the strand, with the proviso that although the enlarged strand area is sufficient, the edge regions of the strand are again not water be charged.
  • the spray bars 8, 10 in addition to the positioning movement inevitably involve an additional movement transverse to the longitudinal axis of the strand, i.e. H. in the direction of the change in thickness, in order to be newly aligned with the center of the other strand format, which is achieved by the inclined plane E, in which the steering levers 12 'pivot simultaneously with the change in distance.
  • the device according to the invention to carry out a time-saving setting of all spray tubes solely by bringing the adjusting lever 14 assigned to each spray bar and thus all steering levers) 12 and 12 'into a pivot position corresponding to the relevant strand format, previously identified and be fixed there.

Abstract

So-called spraying beams, being supports for spraying tubes or nozzles, are arranged in a continuous casting plant for cooling the strand along the surface thereof relative to the strand surface so that the width of the fan-shaped cooling water jets can be adapted to changing strand widths and thicknesses. The adjusting device for the spraying beams comprises two or more pivotable radius levers to which the spraying beams are connected, at least in zones, and which said levers can be locked in different pivoting positions so that the spraying beams or zones of spraying beams can be adjusted parallel with themselves and can be locked at different distances. The radius levers can also be pivotable along inclined planes so that the change of distance of the spraying beam is accompanied by a transverse displacement relative to the longitudinal axis of the strand.

Description

Die Erfindung betrifft eine Verstellvorrichtung für entlang der Oberfläche eines Stranges einer Stranggießanlage verlaufende sogenannte Spritzbalken als Träger für auf die Oberflächen gerichteten Spritzrohre zum Beaufschlagen der Oberflächen mit einem Kühlmedium, z. B. Wasser, nach dem Oberbegriff des Patentanspruches 1 und geht damit von der DE-B1-2 636 666 aus.The invention relates to an adjusting device for so-called spray bars running along the surface of a strand of a continuous casting installation as a carrier for spray tubes directed at the surfaces for applying a cooling medium to the surfaces, e.g. B. water, according to the preamble of claim 1 and is thus based on DE-B1-2 636 666.

Bekanntlich erfolgt bei einer Stranggießanlage die Primärerstarrung des Stranges in der Kokille, der sich die Sekundärkühlung und eine Restkühlstrecke anschließt. In der Kokille erstarren die ersten Kristalle und bilden eine dünne Strangschale bzw. Stranghaut, die sich im Verlaufe der Sekundärkühlung durch Aufbringen eines Kühlmittels (Wasser, Dampf, Wasser-Luftgemisch, Luft) und dem damit verbundenen Wärmeentzug bis zur völligen Durcherstarrung weiter ausbildet. Das gebräuchlichste Kühlmittel, nämlich Wasser, wird dabei mittels Spritzdüsen auf die freien Oberflächen des Stranges zwischen den Stützelementen der Strangführung aufgespritzt.As is known, in a continuous caster, the primary solidification of the strand takes place in the mold, which is followed by the secondary cooling and a residual cooling section. The first crystals solidify in the mold and form a thin strand shell or strand skin, which is further developed in the course of secondary cooling by applying a coolant (water, steam, water-air mixture, air) and the associated removal of heat until it has completely solidified. The most common coolant, namely water, is sprayed onto the free surfaces of the strand between the support elements of the strand guide by means of spray nozzles.

Zum Kühlen von breiten Brammensträngen ist es bekannt (DE-OS-1 936306), die sich der Kokille anschließende Strangführung in Kühlzonen beliebiger Anzahl aufzuteilen und mit mittig zur Strangober- und Strangunterseite angeordneten Versorgungsleitungen zu versehen. Die Versorgungsleitungen weisen eine große Anzahl von Spritzdüsen auf und sind zur Anpassung an unterschiedliche Strangbreiten über einen Motor und eine Spindel mit Spindelmutter heb- und senkbar ausgeführt, so daß der Abstand der von einer Versorgungsleitung getragenen Spritzdüsen zur Strangoberfläche gemeinsam verstellt werden kann.For cooling broad slab strands, it is known (DE-OS-1 936306) to divide the strand guide following the mold into any number of cooling zones and to provide it with supply lines arranged centrally to the top and bottom of the strand. The supply lines have a large number of spray nozzles and can be raised and lowered to adapt to different line widths via a motor and a spindle with a spindle nut, so that the distance between the spray nozzles carried by a supply line and the line surface can be adjusted jointly.

Die bekannte Verstelleinrichtung ist allerdings nicht geeignet, ein notwendiges betriebssicheres Funktionieren zu gewährleisten. Dabei muß man bedenken, daß Stranggießanlagen im gebogenen Verlauf der Strangführung mit einer den gesamten Bereich der Spritzkühlung umfassenden geschlossenen Kühlkammer versehen sind. Die Bedingungen in der Kühlkammer sind während des Gießbetriebes durch das auf den heißen Strang gespritzte Kühlwasser geprägt. Es liegt ein Naßdampfgemisch vor, das im Bereich der Rollenführung eine Temperatur von ca. 80 bis 100° Celsius hat. Das nicht verdampfte, durch den heißen Strang erwärmte Kühlwasser überfließt alle Bauteile und hinterläßt durch das mitgeführte Gießpulver und durch den abgespülten Zunder Ablagerungen auf den Oberflächen der Bauteile. Diese Bedingungen führen zu erheblichen Beschädigungen und Beeinträchtigungen der Spindelverstellvorrichtung und bewirken innerhalb kürzester Frist ein Versagen der Spindelverstellung.However, the known adjusting device is not suitable for ensuring that it functions reliably. It must be borne in mind that continuous casting plants are provided with a closed cooling chamber encompassing the entire area of the spray cooling in the curved course of the strand guide. The conditions in the cooling chamber during the casting operation are characterized by the cooling water sprayed onto the hot strand. There is a wet steam mixture that has a temperature of approx. 80 to 100 ° Celsius in the area of the roller guide. The non-evaporated cooling water heated by the hot strand overflows all components and leaves deposits on the surfaces of the components due to the pouring powder and the washed-off scale. These conditions lead to considerable damage and impairment of the spindle adjustment device and cause the spindle adjustment to fail within a very short time.

Die Erfindung benutzt ein Lenkersystem nach der DE-B1-2636666, durch das einzelne Spritzrohre »parallel zu sich selbst« verstellbar sind in der Weise, daß mit einer Verschiebung der Spritzrohre nach außen für größere Strangbreite auch ein größerer Abstand von der Strangoberfläche eingestellt wird. Da die Spritzrohre quer zur Stranglängsachse verstellbar sind, ist über die gesamte Länge der Strangführung eine Mehrzahl von Parallelogramm-Lenkersystemen mit Verstellantrieb über Mutter und Spindel erforderlich. Das gleiche gilt für Lenkersysteme nach dem Prinzip der »Nürnberger Schere« gemäß der US-A-4 031 946.The invention uses a handlebar system according to DE-B1-2636666, by means of which individual spray tubes can be adjusted “parallel to themselves” in such a way that a larger distance from the surface of the strand is set with a displacement of the spray tubes outwards for a larger strand width. Since the spray tubes can be adjusted transversely to the longitudinal axis of the strand, a plurality of parallelogram handlebar systems with an adjustment drive via nut and spindle are required over the entire length of the strand guide. The same applies to handlebar systems based on the "Nuremberg Scissors" principle according to US-A-4 031 946.

Die bekannten Verstellvorrichtungen sind auch für Spritzbalken anwendbar, die sich gemäß der DE-A-1 936 306 in Längsrichtung der Strangachse erstrecken. Stets wären dann aber für jeden Spritzbalken zwei Parallelogramm-Lenkersysteme oder zwei Nürnberger Scheren mit Verstellantrieben über Mutter und Spindel erforderlich, was die Störanfälligkeit der Stranggießanlage nicht beseitigt. Die Anwendung dieser Systeme zum Besprühen der Seitenflächen des Stranges würde die Störanfälligkeit noch erhöhen.The known adjustment devices can also be used for spray bars which, according to DE-A-1 936 306, extend in the longitudinal direction of the strand axis. However, two parallelogram handlebar systems or two Nuremberg scissors with adjustment drives via nut and spindle would always be required for each spray bar, which does not eliminate the susceptibility of the continuous caster to failure. The use of these systems for spraying the side surfaces of the strand would further increase the susceptibility to faults.

Der Erfindung liegt die Aufgabe zugrunde, die Betriebssicherheit einer Stranggießanlage zu verbessern und eine von Störungen freie, einfache und schnell zu handhabende Verstellvorrichtung für die Spritzbalken einer Stranggießanlage zu schaffen, die in gleicher Weise auch für seitliche Spritzbalken anwendbar ist, die einer Strangoberfläche zugeordnet sind, deren Mitte sich bei wechselnder Breite der Strangoberfläche verlagert, insbesondere für Block- und Knüppel-Stranggießanlagen.The object of the invention is to improve the operational safety of a continuous casting installation and to provide an adjustment device for the spray bars of a continuous casting installation which is free of faults, simple and which can be used in the same way for lateral spraying bars which are assigned to a continuous surface, the center of which shifts with changing width of the strand surface, especially for block and billet continuous casting plants.

Die Lösung dieser Aufgabe besteht gemäß der Erfindung darin, daß alle auf den vier Seiten des Stranges angeordneten und sich entlang der Oberfläche des Stranges erstreckenden Spritzbalken von mindestens zwei Lenkhebeln derart getragen sind, daß sich die Spritzbalken bei der Abstandsänderung in Richtung der Stranglängsachse bewegen, wobei die Lenkhebel der seitlichen Spritzbalken, die einer Strangoberfläche zugeordnet sind, deren Mitte sich bei wechselnder Breite der Strangoberfläche verlagert, in Schrägebenen schwenkbar sind, die mit der jeweiligen senkrecht zur zugeordneten Strangoberfläche durch die Spritzrohre verlaufenden Spritzebene einen spitzen Winkel bilden, derart, daß mit der Abstandsänderung der Spritzbalken eine Querverschiebung der Spritzbalken samt Spritzrohre relativ zur Stranglängsachse einhergeht.According to the invention, this object is achieved in that all the spray bars arranged on the four sides of the strand and extending along the surface of the strand are supported by at least two steering levers such that the spray bars move in the direction of the longitudinal axis of the strand when the distance changes the steering levers of the lateral spray bars, which are assigned to a strand surface, the center of which shifts with changing width of the strand surface, can be pivoted in inclined planes which form an acute angle with the respective spray plane running perpendicularly to the assigned strand surface through the spray tubes, such that with the Change in distance of the spray bars is accompanied by a transverse displacement of the spray bars together with the spray pipes relative to the longitudinal axis of the strand.

Durch die Erfindung wird das gleiche, einfache und robuste Lenkersystem für alle vier umfangsverteilten Spritzbalken bzw. Spritzbalkenzonen eingesetzt, das mit zwei Lenkern pro Spritzbalken auskommt, weil deren Schwenkebene quer zur zugeordneten Strangoberfläche oder - für die seitlichen Spritzbalken - um den spitzen Winkel von der Querebene abweichend verläuft. Die Erfindung ermöglicht es, lange, sich über den gesamten Bereich der Sekundärkühlung erstreckende Spritzbalken vorzusehen, die lediglich über einen Stellhebel, der zugleich einer der beiden Lenkhebel sein kann, auf wechselnde Abstände von der zugeordneten Strangoberfläche eingestellt werden können. Von einem Bedienungsmann oder mechanisch betätigt werden die Stellhebel verschwenkt, und zwar auf einfachste Weise so weit, bis eine Bohrung des Stellhebels, der entsprechend den zu vergießenden Strangformaten mit mehreren, den Abstand des Spritzbalkens für jedes einzelne Strangformat definierenden Bohrungen versehen ist, einer Korrespondenzbohrung des Strangführungsgerüstes gegenüberliegt. Durch Einstecken eines Bolzens in die Bohrungen ist damit in kürzester Zeit ohne weitere Einstelltätigkeit der vorab gewählte Abstand der Spritzbalken mit den Spritzdüsen zur Strangoberfläche erreicht. Die gleiche einfache Verstellmöglichkeit ist auch für die seitlichen Spritzbalken gegeben, die sich zufolge der schrägen Anordnung der Lenkhebel unter einem spitzen Winkel zur Strangoberfläche bei der Abstandsänderung gleichzeitig auf die Mitte des Strangformates einstellen, da sie mit der Bewegung in Stranglängsachse noch eine Bewegung quer zur Stranglängsachse ausführen, so daß die Randbereiche des Stranges vom Wasser unbeaufschlagt bleiben können, was erwünscht ist, und die Spritzrohre auf Mitte zum Strang stehen. Es ist damit für die seitlichen Spritzbalken eine mittenorientierte Abstandsänderung erreicht worden.The invention uses the same, simple and robust handlebar system for all four circumferentially distributed spray bars or spray bar zones, which manages with two links per spray bar, because their swivel plane is transverse to the assigned strand surface or - for the side spray bars - around the acute angle from the transverse plane deviates. The invention makes it possible to provide long spray bars which extend over the entire area of the secondary cooling and can only be adjusted to changing distances from the assigned strand surface by means of an adjusting lever, which can also be one of the two steering levers. The adjusting levers are pivoted by an operator or mechanically, in a very simple manner until a hole in the adjusting lever, which is provided with several holes defining the spacing of the spray bar for each individual strand format in accordance with the strand formats to be cast, a correspondence hole of the Strand guide structure is opposite. By inserting a bolt into the holes, the pre-selected distance of the spray bars with the spray nozzles to the strand surface is reached in a very short time without any further adjustment activity. The same simple adjustment option is also available for the side spray bars, which, due to the oblique arrangement of the steering levers at an acute angle to the strand surface, adjust themselves to the center of the strand format when changing the distance, since they still move transversely to the strand longitudinal axis when moving in the strand longitudinal axis run so that the edge areas of the strand can remain unaffected by the water, which is desirable, and the spray tubes are in the middle of the strand. A center-oriented change in distance has thus been achieved for the side spray bars.

Gemäß der Erfindung ist für sich über die gesamte Sekundärkühlstrecke einer Stranggießanlage erstreckende durchgehende Spritzbalken weiterhin vorgesehen, daß die von der Spritzbalken getragenen Spritzrohre in Richtung des Strangvorschubes zunehmend einen kürzeren Abstand von der Strangoberfläche haben. Die Sekundärkühlstrecke einer Stranggießanlage kann bekanntlich in Kühlzonen aufgeteilt werden, die unter Berücksichtigung der zu vergießenden Stahlqualität unabhängig voneinander geschaltet werden können, wobei es durchaus der Fall sein kann, daß in der (den) untersten Kühlzone keine Spritzkühlung mehr notwendig ist und diese Zone daher abgeschaltet werden kann. Den Strang in den untersten Kühlzonen, wo er mehr und mehr durcherstarrt ist, noch über die gesamte Breite mit Kühlwasser zu beaufschlagen, ist sicher nicht mehr erforderlich, mitunter sogar schädlich. Dieser Tatsache tragen die unterschiedlich langen Spritzröhrchen Rechnung. Ausgehend davon, daß ein einheitlich durchgehender Spritzbalken über die gesamte Länge der Strangführung einmalig verstellt und auf den gewünschten Abstand zum Strang festgelegt wird, ermöglichen die kürzeren Spritzröhrchen am Anfang der Kühlstrecke mit noch überwiegend flüssigem Strangkern eine z. B. 80%ige Beaufschlagung der Strangfläche, während im unteren Kühlbereich der Spritzwinkel durch die längeren Spritzröhrchen mit einem geringeren Abstand zur Strangoberfläche wesentlich eingeengt ist, so daß hier z. B. lediglich noch eine 40%ige Beaufschlagung der Strangfläche vorliegt.According to the invention, continuous spray bars extending over the entire secondary cooling section of a continuous casting installation are further provided that the spray tubes carried by the spray bars increasingly have a shorter distance from the strand surface in the direction of the strand feed. As is known, the secondary cooling section of a continuous caster can be divided into cooling zones, which can be switched independently of one another taking into account the steel quality to be cast, although it may well be the case that spray cooling is no longer necessary in the lowest cooling zone (s) and this zone is therefore switched off can be. It is certainly no longer necessary to apply cooling water to the strand in the lowest cooling zones, where it has become more and more solidified, and is sometimes harmful. The spray tubes of different lengths take this fact into account. Based on the fact that a uniformly continuous spray bar is adjusted once over the entire length of the strand guide and is set to the desired distance from the strand, the shorter spray tubes at the beginning of the cooling section with a predominantly liquid strand core enable a z. B. 80% exposure to the strand surface, while in the lower cooling area the spray angle is significantly narrowed by the longer spray tubes with a smaller distance to the strand surface, so that here z. B. there is only a 40% exposure to the strand area.

Der Gegenstand der Erfindung ist in der Zeichnung anhand eines Ausführungsbeispiels näher erläutert. Es zeigt

  • Fig. 1 eine schematische Darstellung einer Bogenstranggießanlage für quadratische Knüppel in der Seitenansicht und
  • Fig. 2 einen Schnitt entlang der Linie I-I nach Fig. 1.
The object of the invention is explained in more detail in the drawing using an exemplary embodiment. It shows
  • Fig. 1 is a schematic representation of a continuous sheet caster for square billets in side view and
  • 2 shows a section along the line II of FIG. 1st

Bei der Ausführung nach Fig. 1 fließt Stahl aus einem nicht dargestellten Zwischenbehälter in eine Durchlaufgießform oder Kokille 2. Der Kokille 2 nachfolgend ist das Strangführungsgerüst 3 angeordnet, welches den unterhalb der Kokille in den Randzonen bereits erstarrten Strang 4 mit den im Strangführungsgerüst angeordneten Stützwalzen 3a führt und in den Kreisbogen der Stranggießanlage überleitet.In the embodiment according to FIG. 1, steel flows from an intermediate container (not shown) into a continuous casting mold or chill mold 2. The chill mold 2 is followed by the strand guide frame 3, which comprises the strand 4 already solidified below the mold in the edge zones with the support rollers 3a arranged in the strand guide frame leads and transferred into the circular arc of the continuous caster.

Mit dem Austritt aus der Kokille 2, wo der Strang 4 primär gekühlt wird, gelangt der Strang in den als Sekundärkühlstrecke bezeichneten Teil der Stranggießanlage. Während seines Durchganges durch die Stützwalzen 3a der Kühlstrecke wird dem Strang 4 durch mittels Spritzröhrchen bzw. -düsen 6 aufgesprühtes Wasser Wärme entzogen. Dazu sind an der Strangober- und Strangunterseite wie auch an den beiden anderen Strangseiten sich über die gesamte Länge der Sekundärkühlstrecke erstreckende Spritzbalken 7, 8, 9, 10 vorgesehen. Die Sekundärkühlstrecke kann dabei noch in Kühlzonen 5 aufgeteilt sein. Die Spritzbalken tragen eine Vielzahl der Spritzröhrchen 6, welche immer mittig zum Strang 4 ausgerichtet sein müssen.With the exit from the mold 2, where the strand 4 is primarily cooled, the strand reaches the part of the continuous casting plant referred to as the secondary cooling section. During its passage through the support rollers 3a of the cooling section, heat is extracted from the strand 4 by water sprayed on by means of spray tubes or nozzles 6. For this purpose, spray bars 7, 8, 9, 10 extending over the entire length of the secondary cooling section are provided on the top and bottom of the strand as well as on the two other sides of the strand. The secondary cooling section can also be divided into cooling zones 5. The spray bars carry a large number of spray tubes 6, which must always be centered on the strand 4.

Die Spritzbalken 7, 8, 9, 10, die über nicht näher dargestellte Leitungen Anschluß an eine Wasserversorgung haben, sind über mehrere mittels Bolzen 11 schwenkbar gelagerte Lenkhebel 12, 12' in der Art eines Parallelogramm-Lenkersystems mit dem Strangführungs- oder Stützwalzengerüst 3 verbunden. Zur Anpassung an unterschiedliche Strangformate ist jeder Spritzbalken mittels eines verschwenkbaren Stellhebels 14 in seinem Abstand zur Strangoberfläche veränderlich, wie das in Fig. 1 für den Spritzbalken 7 an der Strangunterseite und für den Spritzbalken 9 an der Strangoberseite mit den vom Strang 4 entfernten Spritzbalkenpositionen 7', 9' gezeigt ist. Mit zunehmender Durcherstarrung des Stranges 4 haben die Spritzröhrchen 6 eine größere Länge, so daß der Abstand A der Spritzröhrchen zur Strangoberfläche im unteren Bereich der Strangführung geringer ist als der Abstand A' im oberen Teil der Strangführung. Durch diese Maßnahme ist es möglich, den Spritzwinkel und damit die beaufschlagte Kühlfläche S an der Strangoberfläche mit zunehmender Erstarrung des Stranges zu verkleinern.The spray bars 7, 8, 9, 10, which have a connection to a water supply via lines not shown, are connected to the strand guide or back-up roll stand 3 via a plurality of steering levers 12, 12 'pivotably mounted by means of bolts 11 in the manner of a parallelogram steering system . In order to adapt to different strand formats, each spray bar can be changed in its distance from the strand surface by means of a pivotable adjusting lever 14, as is the case in FIG. 1 for the spray bar 7 on the underside of the strand and for the spray bar 9 on the top of the strand with the spray bar positions 7 ′ removed from the strand 4. , 9 'is shown. With increasing solidification of the strand 4, the spray tubes 6 have a greater length, so that the distance A of the spray tubes to the strand surface in the lower region of the strand guide is less than the distance A 'in the upper part of the strand guide. This measure makes it possible to reduce the spray angle and thus the cooling surface S acted on the strand surface with increasing solidification of the strand.

Wie anschaulich aus der vereinfachten Schnittdarstellung gemäß Fig. 2 hervorgeht, ergeben sich dann, wenn verschiedene Formate z. B. 4' und 4" auf der Stranggießanlage erzeugt werden sollen, besondere Probleme, da hinsichtlich der Kühlung garantiert sein muß, daß die Spritzrohre 6 mittig zum Strang stehen und die Randbereiche des Stranges unabhängig vom Strangquerschnitt nicht vom Kühlwasser beaufschlagt werden. Um diese Forderungen zu erfüllen, muß der Spritzbalken 7 an der Strangunterseite oder -festseite eine andere Einstellung erhalten wie der Spritzbalken 9 an der Strangoberseite oder -losseite. Wiederum davon abweichende Verhältnisse gelten für die seitlichen Spritzbalken 8 und 10. An der Strangunterseite oder -festseite liegt bei wechselnden Strangquerschnitten lediglich eine Veränderung der Strangbreite vor; die Mittigkeit der einmal zum Strang auf Mitte eingestellten Spritzröhrchen 6 ist - wenn die Kokille gewechselt wird - bei der Abstandsveränderung zwangsläufig gewährleistet. Dies gilt ebenso für die Strangoberseite oder -losseite, wobei hier noch eine Abmessungsveränderung des Stranges in der Höhe bzw. Dicke H hinzukommt, so daß der Verstellhub an der Losseite immer größer sein muß wie an der Festseite. Die Verstellung selbst wird durch Verwenken der Stellhebel 14 vorgenommen, die die gelenkig gelagerten Lenkhebel 12 in Richtung der Stranglängsachse verstellen, so daß ein Spritzbalken 7, 9 sich der Strangoberfläche nähert bzw. davon entfernt und dazu noch eine zum Strang parallele Verschiebung entweder in Richtung Kokille oder in Richtung Treibaggregat ausführt, was der Fig. 1 entnommen werden kann, wo der Spritzbalken 9 weiter in Richtung Kokille 2 gestellt ist als der zurückgestellte Spritzbalken 9'. Dieser Versatz V liegt allerdings im Rahmen des Abstandes zweier benachbarter Stützwalzen 3a, die bei Knüppel- und Blockanlagen ohnehin mit großem Abstand nebeneinander liegen.How vividly from the simplified 2 shows, arise when different formats such. B. 4 'and 4 "to be produced on the continuous casting plant, special problems, since with regard to cooling it must be guaranteed that the spray tubes 6 are in the center of the strand and the edge regions of the strand are not acted upon by the cooling water regardless of the strand cross section. To meet these requirements To meet the requirements, the spray bar 7 on the underside or fixed side of the strand must have a different setting than the spray bar 9 on the top or non-strand side, and again different conditions apply to the side spray bars 8 and 10. On the underside or fixed side of the strand there are different ones The cross-section of the strand merely changes the width of the strand, and the center of the spray tube 6, once set to the middle of the strand, is inevitably guaranteed when the mold is changed when the distance is changed in height respectively w. thickness H is added, so that the adjustment stroke on the loose side must always be greater than on the fixed side. The adjustment itself is carried out by pivoting the actuating lever 14, which adjust the articulated steering lever 12 in the direction of the longitudinal axis of the strand, so that a spray bar 7, 9 approaches or removes the surface of the strand and, in addition, a displacement parallel to the strand either in the direction of the mold or in the direction of the drive unit, which can be seen in FIG. 1, where the spray bar 9 is set further in the direction of the mold 2 than the reset spray bar 9 '. This offset V is, however, within the range of the distance between two adjacent support rollers 3a, which are in any case adjacent to one another with a large distance in billet and block systems.

Neben der Anstellung zum Strang hin bzw. davon weg gilt für die seitlichen Spritzbalken 8, 10, daß diese jeweils auch neu auf Strangmitte eingestellt werden müssen. Damit dies ohne zusätzliche Handhabungen beim Einstellen erfolgen kann, sind die seitlichen Lenkhebel 12' in einer Schrägebene E schwenkbar angeordnet, die unter einem bestimmten Winkel x schräg zu der senkrecht zur zugeordneten Strangfläche verlaufenden Spritzrohr-Ebene F verläuft. Beim Gießen des kleinsten Formates sind die seitlichen Spritzbalken 8, 10, wie in Fig. 2 in voll ausgezogenen Linien dargestellt, eng angestellt, und die Spritzröhrchen 6 weisen zur Strangoberfläche nur einen geringen Abstand auf, der so ausgelegt ist, daß der Spritzkegel mit der Grundfläche S die Randbereiche des Stranges nicht bestreicht. Bei wachsenden Strangabmessungen und wie für das größte Format 4' abgebildet, sind die strichpunktiert dargestellten Spritzbalken 8, 10 mit den Spritzröhrchen 6 weit von der Strangoberfläche entfernt, mit der Maßgabe, daß zwar die vergrößerte Strangfläche ausreichend, die Randbereiche des Stranges wiederum nicht mit Wasser beaufschlagt werden. Dazu ist es allerdings erforderlich, daß die Spritzbalken 8, 10 ergänzend zur Anstellbewegung zwangsläufig eine zusätzliche Bewegung quer zur Stranglängsachse, d. h. in Richtung der Dickenänderung, ausführen, um neu auf die Mitte des anderen Strangformates ausgerichtet zu sein, was durch die Schrägebene E, in der die Lenkhebel 12' schwenken gleichzeitig mit der Abstandsveränderung erreicht wird.In addition to the inclination towards the strand or away from it, it applies to the lateral spray bars 8, 10 that they also have to be reset to the middle of the strand. So that this can be done without additional manipulations when setting, the lateral steering levers 12 'are pivotally arranged in an inclined plane E which extends at a certain angle x obliquely to the spray tube plane F running perpendicular to the assigned strand surface. When casting the smallest format, the side spray bars 8, 10, as shown in Fig. 2 in full lines, are set closely, and the spray tubes 6 are only a small distance from the strand surface, which is designed so that the spray cone with the Base area S does not cover the edge areas of the strand. With growing strand dimensions and as shown for the largest format 4 ', the dashed lines 8, 10 with the spray tubes 6 shown in broken lines are far from the surface of the strand, with the proviso that although the enlarged strand area is sufficient, the edge regions of the strand are again not water be charged. To do this, however, it is necessary that the spray bars 8, 10 in addition to the positioning movement inevitably involve an additional movement transverse to the longitudinal axis of the strand, i.e. H. in the direction of the change in thickness, in order to be newly aligned with the center of the other strand format, which is achieved by the inclined plane E, in which the steering levers 12 'pivot simultaneously with the change in distance.

Im Ergebnis ist es mit der Einrichtung gemäß der Erfindung möglich, eine zeitsparende Einstellung sämtlicher Spritzröhrchen allein dadurch vorzunehmen, daß der jedem Spritzbalken zugeordnete Stellhebel 14 und damit alle Lenkhebe) 12 bzw. 12' in eine dem betreffenden Strangformat entsprechende, vorher gekennzeichnete Schwenkposition gebracht und dort festgelegt werden.As a result, it is possible with the device according to the invention to carry out a time-saving setting of all spray tubes solely by bringing the adjusting lever 14 assigned to each spray bar and thus all steering levers) 12 and 12 'into a pivot position corresponding to the relevant strand format, previously identified and be fixed there.

Claims (3)

1. An adjusting device for so-called spraying beams (7, 8, 9, 10) disposed to extend along the surface of a strand in a continuous casting plant and to support spraying tubes (6) which are directed towards the surface of the strand for admission of a cooling agent to said surface, having the purpose of altering the distance between the spraying beams in relation to the strand (4) for adjustment to different strand surface widths, whereby, at least in zones, the spraying beams are adjustable parallel to each other by means of a steering system, characterized in that all spraying beams (7, 8, 9, 10) disposed on the four sides of the strand (4', 4") and extending along the surface of the strand are supported by at least two steering levers (12, 12') in such a manner that alteration of the distance will let the spraying beams move in the direction of the longitudinal strand axis, whereby the steering levers (12') of the lateral spraying beams (8, 10) associated with a strand surface, the center of which is displaced as the width (H) of the surface of the strand changes, may pivot on inclined planes (E) which form an acute angle (α) with the respective spraying plane (F) extending through the spraying tubes (6) vertically to the associated strand surface, so that alteration of the distance of the spraying beams (8, 10) will bring about transverse displacement of the spraying beams and spraying tubes in relation to the longitudinal axis of the strand.
2. An adjusting device according to Claim 1 with uninterrupted spraying beams (7, 8, 9, 10) extending over the entire secondary cooling length of a continuous casting plant, characterized in that the spraying tubes (6) supported by the spraying beams are disposed to come progressively closer to the surface of the strand in the advance direction of the strand.
3. An adjusting device according to Claim 1 or 2, characterized in that one of the steering levers (12, 12') of a spraying beam (7, 8, 9, 10) is extended in length to form an adjusting lever (14).
EP80105422A 1979-09-28 1980-09-11 Cooling apparatus, especially for ingot and billet strands Expired EP0028686B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105422T ATE5462T1 (en) 1979-09-28 1980-09-11 DEVICE FOR COOLING ESPECIALLY BLOCK AND BILLET STRAIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2939322 1979-09-28
DE2939322A DE2939322C2 (en) 1979-09-28 1979-09-28 Device for changing the distance between spray bars in a continuous caster

Publications (2)

Publication Number Publication Date
EP0028686A1 EP0028686A1 (en) 1981-05-20
EP0028686B1 true EP0028686B1 (en) 1983-11-30

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EP80105422A Expired EP0028686B1 (en) 1979-09-28 1980-09-11 Cooling apparatus, especially for ingot and billet strands

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US (1) US4476914A (en)
EP (1) EP0028686B1 (en)
JP (1) JPS5656768A (en)
AT (1) ATE5462T1 (en)
DE (1) DE2939322C2 (en)
ES (1) ES8105597A1 (en)

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DE102009005679A1 (en) 2009-01-22 2010-07-29 Sms Siemag Aktiengesellschaft Continuous casting plant to produce metal strands, comprises strand guide for guiding strands with strand-guiding rollers, and spray nozzle arrangement, where spray nozzles are arranged in free areas between adjacent strand-guiding rollers

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US6264767B1 (en) 1995-06-07 2001-07-24 Ipsco Enterprises Inc. Method of producing martensite-or bainite-rich steel using steckel mill and controlled cooling
DE19702718C1 (en) * 1997-01-15 1998-10-01 Mannesmann Ag Cooling medium control in a continuous casting installation
WO2000003042A1 (en) 1998-07-10 2000-01-20 Ipsco Inc. Method and apparatus for producing martensite- or bainite-rich steel using steckel mill and controlled cooling
DE10133093A1 (en) * 2000-08-10 2002-02-21 Sms Demag Ag Process and strand guide for supporting, guiding and cooling cast strands made of steel, in particular of pre-profiles for beams
DE10054750A1 (en) * 2000-11-04 2002-05-08 Sms Demag Ag Strand guidance of a continuous caster with a device for secondary cooling
AT503526B1 (en) * 2006-04-25 2008-07-15 Voest Alpine Ind Anlagen SPRAY NOZZLE ADJUSTMENT
KR20210065105A (en) 2018-09-25 2021-06-03 프리메탈스 테크놀로지스 오스트리아 게엠베하 Roller Stand with Fixing Device for Fixing of the Mid Area Spray Bar
CN109396372B (en) * 2018-12-28 2024-02-06 中冶京诚工程技术有限公司 Double-cold spray quick-changing device for multi-section square and round billet continuous casting machine

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DE102009005679A1 (en) 2009-01-22 2010-07-29 Sms Siemag Aktiengesellschaft Continuous casting plant to produce metal strands, comprises strand guide for guiding strands with strand-guiding rollers, and spray nozzle arrangement, where spray nozzles are arranged in free areas between adjacent strand-guiding rollers

Also Published As

Publication number Publication date
US4476914A (en) 1984-10-16
DE2939322A1 (en) 1981-04-16
ES495097A0 (en) 1981-06-16
EP0028686A1 (en) 1981-05-20
ATE5462T1 (en) 1983-12-15
DE2939322C2 (en) 1986-09-11
JPS5656768A (en) 1981-05-18
ES8105597A1 (en) 1981-06-16

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