EP1620217B1 - Twin roll casting plant - Google Patents

Twin roll casting plant Download PDF

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Publication number
EP1620217B1
EP1620217B1 EP04728773A EP04728773A EP1620217B1 EP 1620217 B1 EP1620217 B1 EP 1620217B1 EP 04728773 A EP04728773 A EP 04728773A EP 04728773 A EP04728773 A EP 04728773A EP 1620217 B1 EP1620217 B1 EP 1620217B1
Authority
EP
European Patent Office
Prior art keywords
housing
scrap
metal strip
installation according
roll casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04728773A
Other languages
German (de)
French (fr)
Other versions
EP1620217A1 (en
Inventor
Michael Zahedi
Thomas Stepanek
Gerald Hohenbichler
Franz PLÖCKINGER
Karl Klima
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
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 Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP1620217A1 publication Critical patent/EP1620217A1/en
Application granted granted Critical
Publication of EP1620217B1 publication Critical patent/EP1620217B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/005—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of rolls, wheels or the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • C22C33/0271—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5% with only C, Mn, Si, P, S, As as alloying elements, e.g. carbon steel

Definitions

  • the invention relates to a Zweiwalzeng screenstrom with two horizontal axes about oppositely rotating casting rolls, with a casting gap for the formation and the discharge of a thin cast metal strip, with a sealed enclosure, which has a bottom and the transport path of the casting gap leaving metal strip from a vertical casting direction circumscribed in an approximately horizontal transport direction, with diverters for the metal strip in this enclosure and with a movable scrap container for the removal of accumulating scrap and scale from the Zweiwalzeng screenstrom. Furthermore, the invention relates to a method for initiating a casting process using the Zweiwalzeng screen listening invention.
  • Two-roll casters are used to produce metal strips, preferably steel strip, with a wide range and with a strip thickness of less than 10 mm in a continuous casting process.
  • metal strips preferably steel strip
  • a high tendency to scale on contact with oxygen occurs at high temperatures, so that the molten metal and the cast metal strip are guided until their extensive cooling in a non-oxidizing protective gas atmosphere.
  • a Zweiwalzeng veistrom of the generic type is already known. It consists of two counter-rotating about horizontal axes of rotation casting rolls, which form together with frontally engageable with the casting rolls side plates a melting space and a casting gap, from which a cast metal strip is conveyed vertically downwards.
  • the cast metal strip is deflected to form a sagging loop in the horizontal and fed to one or more further processing facilities. Leaving the casting gap, the hot metal band passes through a sealed chamber with a protective gas atmosphere, are largely avoided by the oxidation processes on the metal strip surface. All openings in this chamber are provided with sealed gates or locks.
  • the sealed chamber also includes an open space to the casting rolls for receiving a movable scrap car, which can be brought via a lock system, which can be flooded with inert gas in a receiving position for the resulting scrap and scale below the two casting rolls and removed therefrom ,
  • a lock system which can be flooded with inert gas in a receiving position for the resulting scrap and scale below the two casting rolls and removed therefrom .
  • large lock gates must be opened and large spaces receiving the scrap car must be flooded with protective gas.
  • elaborate sealing system must be installed for the large floodgates.
  • a pivotable guide flap for the cast metal strip is further known that supports the diversion of the metal strip in the horizontal and to a driving roller frame in an operating position and in a retracted position allows the vertical discharge of a strand piece in the scrap bucket.
  • Such a solution is also known from WO 01/23120.
  • the object of the present invention is therefore to avoid the disadvantages of the known prior art and to propose a two-roll caster and a method for initiating a casting process using a two-roll caster. whereby it is possible to keep the insulated with inert gas space for the implementation of a hot metal strip as small as possible and at the same time to allow continuous collection of scrap and possibly accumulating scale without or with only very small leaks on the enclosure.
  • Another object of the invention is to form the two-roll caster so as to allow a discharge of the collected scrap or scale with very little air entering the insulated enclosure.
  • the bottom of the housing at least in a partial area forms a collecting trough for the scrap, which is part of an emptying device, and in that a movable scrap collecting container is arranged in a receiving position below the emptying device.
  • the emptying device comprises at least one collecting trough for receiving the scrap, at least one support for this collecting trough on a support frame or on the housing, which allows actuation of the collecting trough between a closed and an open position, at least one adjusting drive for a displacement of the collecting trough be able to perform an emptying and possibly necessary seals in order to avoid the false air entering the enclosure.
  • An expedient embodiment is that the sump for the scrap between a closed and an open position is designed to be displaced and coupled with an adjustment and that the housing a sealing element for sealing a gap between the housing and the sump in the is associated with the closed position.
  • the sump can be formed in one or more parts and the emptying can be done by a sliding movement, preferably in a one-piece design or by a pivoting movement about one or more pivot axes, preferably in a multi-part design.
  • the collecting trough is assigned an adjusting drive, which can be formed by a controllable pressure medium cylinder or by at least one driven landing gear wheel.
  • the effective between the enclosure and the sump sealing elements are suitably attached to the housing and formed in the closed position of the sump to this pressed. Damage to the sealing element in the manipulation of the collecting trough and in particular in the scrap discharge are thus avoided.
  • a preferred embodiment of the sealing element is that the sealing element comprises a relative to the housing and to the collecting trough and be pressed against the collecting cavity Abdichtring which is supported by a housing engaging on the attached and displacing element, and which is coupled to a controllable displacement device.
  • the displacement element may be formed, for example, by a bellows or another elastic element which permits longitudinal extension
  • the controllable displacement device may be formed, for example, by a pressure medium cylinder articulated on the housing.
  • the collecting trough on a chassis and this chassis is a road, especially rails assigned.
  • the distance between the sump and the housing or attached to the housing sealing element can be reduced so far that a sealing closed position automatically or with at least simultaneously with the start of the closed position on the last section of the displacement a small displacement of the sealing element is achieved.
  • the collecting trough sliding elements and these sliding elements is associated with a stationary slide.
  • the slideway can simultaneously with the start of the closed Position on the last section of the displacement path, the distance between the sump and the housing or attached to the housing sealing element can be reduced so far that a sealing closed position is achieved.
  • the emptying of the collecting trough takes place during a horizontal displacement movement of the collecting trough, it is advantageous if, at a distance from the collecting trough at the housing, a wiping sword for stripping the scrap accumulated in the collecting trough is arranged.
  • the distance between the Räumhet and the collecting tray is chosen so that there is no jamming of scrap parts between the stationary Räumhet and the collecting trough.
  • the reaming blade can slide on the collecting trough. For emergencies a possibility of withdrawal of the Räumhetes is provided transversely to the sliding movement of the sump.
  • the collecting trough comprises a receiving area for the scrap, which can be configured differently.
  • the receiving area for the scrap may be formed by a flat surface, wherein the associated Räumhist has a straight reaming edge, which is located at a small distance from the surface of the receiving area or slides on it.
  • the receiving area for the scrap can also be formed as a trough-shaped depression, wherein this depression preferably exists on three sides of the collecting trough and on the fourth side, at which the emptying of the collecting trough takes place, the trough-shaped depression expires substantially horizontally. This emptying using a Räumhetes whose Räumkante is adapted to the cross section of the trough-shaped depression, equally possible.
  • a sealing element associated with the housing is formed in the receiving position open position of the sump to the mobile scrap container in its receiving position.
  • a further improvement of the seal can be achieved if a seal between the mobile scrap container and the housing is ensured on at least three sides during the ongoing displacement operation of the collecting trough. This is achieved by a multi-part sealing element.
  • the Schadluftminimierung can be achieved when the housing is assigned a single circumferential sealing element which is formed in the closed position of the sump to this and in the open position of the sump to the mobile scrap container pressed.
  • the Schadluftminim réelle can be achieved if the housing are assigned two independent sealing elements, one of these sealing elements is formed in the closed position of the sump to this sump and the second sealing element to the mobile scrap container pressed.
  • the two sealing elements are preferably attached concentrically to each other on the outer wall of the enclosure and independently operable.
  • a further reduction of the remaining only very small damage influx can be achieved if the mobile scrap container is positioned in its receiving position in a closed scrap chamber, which connects sealingly below the housing to this.
  • a treatment chamber with a belt conveyor, such as a roller table, and optionally further belt treatment facilities for the metal strip, such as a temperature compensation furnace in front of a rolling stand, the bottom of this treatment chamber of at least one emptying Collecting container for scale and optionally scrap, for example, trimming scrap from a Bandbeklamstrom is formed.
  • a belt conveyor such as a roller table
  • belt treatment facilities for the metal strip such as a temperature compensation furnace in front of a rolling stand
  • the sump is formed as a sump with a closure device and may be formed for example by a funnel-shaped collection bunker with a closure flap.
  • One or more receiving positions for a movable scrap collecting container are provided under the collecting containers.
  • the mobile scrap collecting container is equipped with a travel control, which allows a controlled approach to all receiving positions below the transport path of the metal strip.
  • the receiving positions are determined for example by electrical sliding contacts or light barriers.
  • an operating method for initiating a casting process which allows the derivation and removal of a first portion of the cast metal strip from the plant, which is produced in a transient start phase of the two-roll caster and the quality requirements of the product to be produced yet.
  • a scrap manipulation is proposed in particular, which minimizes the false air access during this start phase, but also allows the subsequent production steps and scrap removal from the system with minimized air access.
  • a two-roll caster in which two casting rolls rotating about horizontal axes and pressing side plates form a melt space for receiving molten metal and a casting gap for molding a cast metal strand, and molten metal in the melt space continuously or after a predetermined Anfahrkurve is introduced and a cast metal strip from the casting gap is discharged continuously or after a predetermined Anfahrkurve, achieved by a cast in a transient start phase first portion of the metal strip at a deflected in a retraction position diverter and in a retracted open position displaced collection trough in in a substantially vertical direction is conveyed directly into the scrap container, that upon reaching a stationary phase of operation, the first portion of the cast metal strip, before is preferably separated in the casting gap, that then the diverter is pivoted to the threading and that the subsequent cast metal strip is passed in a substantially horizontal transport direction and then or at the same time the sump is moved to the closed position.
  • the actual startup procedure can be done in different ways.
  • molten metal is introduced into the melt space up to an operating molten metal level and the discharge of the metal strip is started during this filling process.
  • This process can begin with standing or already rotating casting rolls.
  • the casting gap may differ in width from a Radiog fauxspaltbreite.
  • the filling process in the melting chamber, the casting speed and the casting gap width can follow a given starting curve.
  • the separation of the first section thus produced under unsteady casting conditions takes place under the effect of the dead weight of this strip section.
  • the casting speed and the casting gap width can follow a course curve.
  • a preferred starting method for the casting process in a two-roll casting plant without consideration of the scrap industry is described in detail already in the Austrian patent application AT-A 1367/2002 and considered as an integral part of this application.
  • Fig. 1 shows a schematic representation of a Zweiwalzeng screenstrom the inventive type for the continuous production of a steel strip.
  • the Zweiwalzeng screenstrom consists with its core device for forming the metal strip of two horizontal axes in opposite directions rotating, driven casting rolls 1, 2, which together with two side plates 3, of which only one is shown in Fig. 1, a Form melting chamber 4 for receiving molten metal, which is supplied from an intermediate vessel 5 via a dip tube 6 in the melting chamber 4 and forms a melt there.
  • the melting chamber 4 is largely hermetically sealed with a cover 7, which allows the maintenance of a protective gas atmosphere over the melt bath.
  • the two cooled casting rolls 1, 2 and the adjacent to the faces of the casting rolls side plates 3 form a casting gap 8, from which the previously solidified on the casting roll surfaces in the form of strand shells molten metal as cast metal strip 9 in the vertical casting direction and deflected in a horizontal transport direction with a drive roller frame 10 different processing devices is supplied in the arrow direction.
  • a pivotable skid-shaped diverter 11 is provided below the G manspaltes 8, which is shown by a thick lines shown Einfädelposition in which the metal strip 9 is redirected to the traction roller frame 10 in a substantially vertical dash-dotted lines Retraction position can be pivoted. In this retraction position tape sections, such as those incurred in particular at the start of casting and at the end of the casting, can be disposed of as scrap vertically downwards.
  • the transport path of the metal strip 9 from the exit from the casting gap 8 until it enters the drive roller frame 10 is delimited by an enclosure 13, which is usually formed by sheet metal walls with a refractory lining on the inside.
  • an enclosure 13 which is usually formed by sheet metal walls with a refractory lining on the inside.
  • gaskets are provided between the wall of the housing and the casting rolls 1, 2 or the side plates 3, as described in the Austrian patent application AT-A 303/2002.
  • a treatment chamber 14 which is likewise flooded with protective gas, closes sealingly against the housing 13, in which the metal strip is transported on a roller table 15 and supplied to further processing devices, not shown.
  • These may include, for example, thermal treatments of the metal strip in a strip edge heating device or in a temperature compensation oven or mechanical treatment of the metal strip in a stripper or in rolling stands.
  • the bottom 16 of the housing 13 forms an emptying device 17 and is formed in a region below the G fauxspaltes 8 of a collecting trough 18, are collected in the falling, excreted from the production process, short tape sections and casts of the cast metal strip falling down tinder.
  • the Anfahr Swiss of the cast metal strip formed at the start of casting during a transient start phase does not meet the required product requirements and is therefore at least partially not deflected in the horizontal transport direction for further processing to the first drive pulley frame, but derived directly vertically down into the sump 18.
  • the collecting trough 18 has a trough-shaped receptacle for the scrap and is equipped with a chassis 19 which comprises bicycles 20 which roll on a roadway 21 formed by a horizontal side member or a rail.
  • a chassis 19 which comprises bicycles 20 which roll on a roadway 21 formed by a horizontal side member or a rail.
  • controllable displacement device 22 which is formed by a long-stroke pressure cylinder 23
  • the sump 18 is displaceable from a closed position shown in thick lines for receiving the scrap in a retracted open in dotted lines position shown.
  • a Räumhet 27 which is arranged at a small distance above the collecting trough 18 and transversely to their direction of displacement, the accumulated scrap is removed during the sliding movement in the open position from the collecting trough and spent in a provided underneath scrap container 25.
  • the scrap container is used in a traveling frame 28 and can be manipulated independently of the ongoing production process on the two-roll caster.
  • an adjustable sealing element 30 is arranged between these components.
  • a possible embodiment is shown schematically in Fig. 2 in a partial section.
  • Fig. 2 shows a portion of the lower end of the housing 13 and the underlying positioned at a distance collecting trough 18 for the scrap.
  • a circumferential support flange 32 is welded for the attachment of the sealing element 30.
  • Between the support flange 32 and the sealing ring support frame 35 is a change in length permitting formed by a bellows 36 displacement element 37 for the sealing ring support frame 35 which is attached on the one hand to the support flange 32 and the other part on the sealing ring support frame 35 sealing.
  • synchronously controllable displacement devices 38 which are formed by pressure medium cylinders 39, arranged with which the sealing ring 34 to the support plate 33 of the sump 18 in the closed position of the sump can be pressed or lifted from this, if the sump is to be moved to its emptying in the open position.
  • 13 telescopically telescoping fenders 40 are secured between the bellows and the outer wall 31 of the housing 31 both on the support flange 32 and on the sealing ring support frame 35.
  • the sealing ring 34 is made of an elastic material such as fabric, fiber material and the like. But it can also be replaced by another type of seal, such as a sand seal, wherein the support plate is formed on the sump as a trough-shaped receptacle for sand and immersed in place of the sealing ring, a sealing sheet in the closed position of the sump in this sand fill.
  • the sealing plate is in turn with a displacement element, such as a pressure cylinder, height adjustable.
  • FIG. 6 a further embodiment of a most efficient seal between the housing 13 and the underlying collecting trough 18 and the scrap container 25 is shown analogous to FIG.
  • Two independently operable sealing elements 30, 30a are fastened to the outer wall of the collecting trough 13, wherein the sealing element 30, as described with reference to FIG. 2, forms a sealed connection to the collecting trough 18 and the further sealing element 30a arranged concentrically with this sealing element 30 Connects to the scrap container 25 manufactures.
  • the structural design of the two sealing elements 30, 30a is identical and corresponds to the statements of FIG. 2. Any other equivalent sealing element can be used equally. Through this double arrangement remains during all operating cases always a sealing connection, either to the collecting trough 18 or at least three sides to the scrap container 25 exist.
  • the inventive arrangement of the housing 13, the sump 18 and the scrap container 25 is illustrated to each other in three characteristic operating cases.
  • the sump 18 is formed here trough-shaped, double-walled and water-cooled and filled with sand.
  • FIG. 3 an operating case is illustrated as it occurs in the start-up phase of the casting process.
  • the scrap tray 18 is moved to the open position, so that the housing 13 is open to the scrap container 25 and fall falling tape parts directly into the scrap container.
  • the enclosure 13 on all sides comprehensive sealing element 30 rests with its sealing ring 34 on the support plate 33 of the scrap container 25 and is in its lowest position of use and sealingly closes the gap between the housing and the scrap container.
  • Fig. 4 an operating case is illustrated, in which the sump 18 occupies the closed position below the housing 13 and the sealing element 30 rests with its sealing ring 34 on the support plate 33 of the sump 18. At best, falling scrap and scale are collected in the collecting trough until the scrap collecting container 25 returns to its receiving position below the closed collecting trough after it has been emptied. During this closed position of the sump 18, the scrap container 25 without interference of the production process on the two-roll caster at any time be emptied out of the system for its emptying.
  • Fig. 5 illustrates the operation case in which accumulated scrap is recirculated from the sump 18 in the scrap container.
  • the treatment chamber 14 immediately following the transport path of the cast metal strip of the housing 13 can likewise be flooded with protective gas.
  • the bottom of this treatment chamber 14 is below the formed by a roller conveyor belt conveyor 15 on which the still hot metal belt is transported, equipped with two emptying funnel-shaped collecting containers 41 with flaps 43 which opened by pressure medium cylinder 42 and can be closed.
  • a scavenger tank 25 equipped with a travel control can approach in succession both the emptying position below the closed collecting trough 18 and individual emptying positions below the closing flaps 43, which are opened after taking in the respective emptying position.
  • the individual emptying positions are determined by sliding contacts or light barriers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Processing Of Solid Wastes (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

A two-roll casting installation with two casting rolls which rotate in opposite directions about horizontal axes and forming a casting gap for forming and discharging a thin cast metal strip. A sealed housing which has a base and surrounds a conveying path for the metal strip which leaves the casting gap and which strip is from a vertical casting direction into an approximately horizontal conveying direction. Diverter devices divert the metal strip within the housing. A displaceable scrap collection container removes scrap and scale produced from the two-roll casting installation. To minimize the penetration of external air into the housing, the base of the housing, at least in a subregion, forms a collection trough for the scrap, which is part of an emptying device, and a displaceable scrap collection container is arranged in a receiving position below the emptying device.

Description

Die Erfindung betrifft eine Zweiwalzengießanlage mit zwei um horizontale Achsen gegensinnig rotierende Gießwalzen, mit einem Gießspalt für die Bildung und das Ausfördern eines dünnen gegossenen Metallbandes, mit einer abgedichteten Einhausung, die einen Boden aufweist und die den Transportweg des den Gießspalt verlassenden Metallbandes von einer vertikalen Gießrichtung in eine annähernd horizontale Transportrichtung umgrenzt, mit Umleiteinrichtungen für das Metallband in dieser Einhausung und mit einem verfahrbaren Schrottsammelbehälter zum Abtransport von anfallendem Schrott und Zunder aus der Zweiwalzengießanlage. Weiters betrifft die Erfindung ein Verfahren zum Einleiten eines Gießprozesses unter Verwendung der erfindungsgemäßen Zweiwalzengießeinrichtung.The invention relates to a Zweiwalzengießanlage with two horizontal axes about oppositely rotating casting rolls, with a casting gap for the formation and the discharge of a thin cast metal strip, with a sealed enclosure, which has a bottom and the transport path of the casting gap leaving metal strip from a vertical casting direction circumscribed in an approximately horizontal transport direction, with diverters for the metal strip in this enclosure and with a movable scrap container for the removal of accumulating scrap and scale from the Zweiwalzengießanlage. Furthermore, the invention relates to a method for initiating a casting process using the Zweiwalzengießeinrichtung invention.

Zweiwalzengießanlagen werden zur Herstellung von Metallbändern, vorzugsweise von Stahlbändern, mit großer Bandbreite und mit einer Banddicke von weniger als 10 mm in einem kontinuierlichen Gießprozess eingesetzt. Insbesondere bei Kohlenstoffstählen tritt bei hohen Temperaturen eine hohe Verzunderungsneigung bei Kontakt mit Sauerstoff auf, sodass die Metallschmelze und das gegossenen Metallband bis zu seiner weitgehenden Abkühlung in einer nicht oxidierend wirkenden Schutzgasatmosphäre geführt werden.Two-roll casters are used to produce metal strips, preferably steel strip, with a wide range and with a strip thickness of less than 10 mm in a continuous casting process. In particular, in the case of carbon steels, a high tendency to scale on contact with oxygen occurs at high temperatures, so that the molten metal and the cast metal strip are guided until their extensive cooling in a non-oxidizing protective gas atmosphere.

Aus der WO 02/11924 ist eine Zweiwalzengießanlage der gattungsbildenden Art bereits bekannt. Sie besteht aus zwei um horizontale Drehachsen gegenläufig rotierende Gießwalzen, die zusammen mit stirnseitig an die Gießwalzen anstellbaren Seitenplatten einen Schmelzenraum und einen Gießspalt bilden, aus dem ein gegossenes Metallband vertikal nach unten ausgefördert wird. Das gegossene Metallband wird unter Ausbildung einer durchhängenden Schlaufe in die Horizontale umgelenkt und einer oder mehreren Weiterbehandlungseinrichtungen zugeführt. Aus dem Gießspalt austretend, durchläuft das heiße Metallband eine abgedichtete Kammer mit einer Schutzgasatmosphäre, durch die Oxidationsvorgänge an der Metallbandoberfläche weitgehend vermieden werden. Alle Öffnungen in dieser Kammer sind mit abgedichteten Toren bzw. Schleusen versehen.From WO 02/11924 a Zweiwalzengießanlage of the generic type is already known. It consists of two counter-rotating about horizontal axes of rotation casting rolls, which form together with frontally engageable with the casting rolls side plates a melting space and a casting gap, from which a cast metal strip is conveyed vertically downwards. The cast metal strip is deflected to form a sagging loop in the horizontal and fed to one or more further processing facilities. Leaving the casting gap, the hot metal band passes through a sealed chamber with a protective gas atmosphere, are largely avoided by the oxidation processes on the metal strip surface. All openings in this chamber are provided with sealed gates or locks.

Die abgedichtete Kammer umfasst auch einen zu den Gießwalzen offenen Raum für die Aufnahme eines verfahrbaren Schrottwagens, der über ein Schleusensystem, welches mit Schutzgas geflutet werden kann, in eine Aufnahmeposition für den anfallenden Schrott und Zunder unterhalb der beiden Gießwalzen gebracht und von dort entfernt werden kann. Zur Manipulation des Schrottwagens müssen große Schleusentore geöffnet werden und große den Schrottwagen aufnehmende Räume mit Schutzgas geflutet werden. Weiters müssen aufwendige Dichtsystem für die großen Schleusentore installiert sein.The sealed chamber also includes an open space to the casting rolls for receiving a movable scrap car, which can be brought via a lock system, which can be flooded with inert gas in a receiving position for the resulting scrap and scale below the two casting rolls and removed therefrom , In order to manipulate the scrap car, large lock gates must be opened and large spaces receiving the scrap car must be flooded with protective gas. Furthermore, elaborate sealing system must be installed for the large floodgates.

Aus der WO 02/11924 ist weiters eine schwenkbare Leitklappe für das gegossene Metallband bekannt, die in einer Betriebsposition die Umleitung des Metallbandes in die Horizontale und zu einem Treibrollengerüst unterstützt und in einer Rückzugsposition die vertikale Ableitung eines Strangstückes in den Schrottkübel ermöglicht. Eine derartige Lösung ist auch aus der WO 01/23120 bekannt.From WO 02/11924 a pivotable guide flap for the cast metal strip is further known that supports the diversion of the metal strip in the horizontal and to a driving roller frame in an operating position and in a retracted position allows the vertical discharge of a strand piece in the scrap bucket. Such a solution is also known from WO 01/23120.

Aus der EP-B 726 112 und der WO 01/39914 sind Zweiwalzengießanlagen der gattungsbildenden Art bekannt, bei denen das gegossene Metallband durch eine isolierte Kammer ohne integrierten Bodenbereich geführt wird. Der Bodenbereich wird von einem stirnseitig an die Seitenwände der isolierten Kammer vertikal anpressbaren Schrottkübel gebildet, der auf einem verfahrbaren Schrottwagen heb- und senkbar aufliegt. Zwischen den Seitenwänden der isolierten Kammer und den Rändern des Schrottkübels ist eine Dichtung vorgesehen, mit der die isolierte Kammer weitgehend gasdicht abgeschlossen wird. Bei einem Wechsel des mit Schrott gefüllten Schrottkübels geht auch die Schutzgasatmosphäre in der vom Metallband durchlaufenen isolierten Kammer verloren und es ist notwendig, die gesamte Kammer nach dem Wiedereinsetzen eines leeren Schrottkübels mit Schutzgas zu fluten, wobei der Verbleib einer größeren Menge von Falschluft und damit Restsauerstoff unvermeidbar ist. Dadurch kommt es zu einer verstärkten Verzunderung des nachfolgend gegossenen Metallbandes über einen längeren Zeitraum und damit zu vermehrten Schrottanfall bzw. zu einer Beeinträchtigung der Oberflächenqualität des gegossenen Bandes. Deshalb ist eine Entleerung des Schrottkübels ausschließlich in Produktionspausen möglich.From EP-B 726 112 and WO 01/39914 Zweiwalzengießanlagen of the generic type are known in which the cast metal strip is passed through an insulated chamber without integrated bottom portion. The bottom portion is formed by a frontally to the side walls of the insulated chamber vertically compressible scrap bucket, which rests on a movable scrap car and lowered rests. Between the side walls of the insulated chamber and the edges of the scrap bucket, a seal is provided, with which the insulated chamber is largely sealed gas-tight. When changing the filled with scrap junk and the inert gas atmosphere is lost in the traversed by the metal band insulated chamber and it is necessary to flood the entire chamber after reinserting an empty jar with inert gas, the whereabouts of a larger amount of false air and thus residual oxygen is inevitable. This leads to an increased scaling of the subsequently cast metal strip over a longer period of time and thus to increased scrap or to an impairment of the surface quality of the cast strip. Therefore, an emptying of the scrap bucket is possible only in production breaks.

Aufgabe der vorliegenden Erfindung ist es daher, die Nachteile des bekannten Standes der Technik zu vermeiden und eine Zweiwalzengießanlage und ein Verfahren zum Einleiten eines Gießprozesses unter Verwendung einer Zweiwalzengießanlage vorzuschlagen, wodurch es ermöglicht wird, den mit Schutzgas isolierten Raum für die Durchführung eines heißen Metallbandes möglichst klein zu halten und gleichzeitig eine kontinuierliches Sammeln von Schrott und gegebenenfalls anfallenden Zunder ohne beziehungsweise mit nur sehr geringen Leckagen an der Einhausung zu ermöglichen.The object of the present invention is therefore to avoid the disadvantages of the known prior art and to propose a two-roll caster and a method for initiating a casting process using a two-roll caster. whereby it is possible to keep the insulated with inert gas space for the implementation of a hot metal strip as small as possible and at the same time to allow continuous collection of scrap and possibly accumulating scale without or with only very small leaks on the enclosure.

Ein weiteres Ziel der Erfindung besteht darin, die Zweiwalzengießanlage so auszubilden, dass eine Ableitung des gesammelten Schrottes bzw. Zunders mit sehr geringen Lufteintritt in die isolierte Einhausung zu ermöglichen.Another object of the invention is to form the two-roll caster so as to allow a discharge of the collected scrap or scale with very little air entering the insulated enclosure.

Diese gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Boden der Einhausung zumindest in einem Teilbereich eine Sammelmulde für den Schrott bildet, die Teil einer Entleereinrichtung ist, und dass ein verfahrbarer Schrottsammelbehälter in einer Aufnahmeposition unterhalb der Entleereinrichtung angeordnet ist.This object is achieved according to the invention in that the bottom of the housing at least in a partial area forms a collecting trough for the scrap, which is part of an emptying device, and in that a movable scrap collecting container is arranged in a receiving position below the emptying device.

Durch die Ausgestaltung eines Teilbereiches der Einhausung als Sammelmulde für anfallenden Schrott und die Anordnung des ein großes Volumen einnehmenden Schrottwagens außerhalb dieser Einhausung kann der eigentliche Sammelraum für den Schrott klein gehalten werden, wodurch auch das mit Schutzgas zu flutende Volumen der Einhausung minimiert ist. Gleichzeitig bietet diese Anordnung die Möglichkeit, den Schrottwagen unabhängig vom laufenden Produktionsprozess auf der Zweiwalzengießanlage zu manipulieren.Due to the design of a portion of the enclosure as a collecting trough for accumulating scrap and the arrangement of a large volume engaging scrap car outside of this enclosure, the actual collection space for the scrap can be kept small, whereby the to be flooded with inert gas volume of the housing is minimized. At the same time, this arrangement offers the possibility of manipulating the scrap wagon on the two-roll caster independently of the ongoing production process.

Die Entleereinrichtung umfasst zumindest eine Sammelmulde für die Aufnahme des Schrottes, mindestens eine Abstützung für diese Sammelmulde an einem Traggerüst oder an der Einhausung, die eine Betätigung der Sammelmulde zwischen einer geschlossenen und einer geöffneten Position ermöglicht, mindestens einen Verstellantrieb für eine Verlagerung der Sammelmulde, um eine Entleerung durchführen zu können und gegebenenfalls notwendige Dichtungen, um den Falschlufteintritt in die Einhausung zu vermeiden.The emptying device comprises at least one collecting trough for receiving the scrap, at least one support for this collecting trough on a support frame or on the housing, which allows actuation of the collecting trough between a closed and an open position, at least one adjusting drive for a displacement of the collecting trough be able to perform an emptying and possibly necessary seals in order to avoid the false air entering the enclosure.

Eine zweckmäßige Ausführungsform besteht darin, dass die Sammelmulde für den Schrott zwischen einer geschlossenen und einer geöffneten Position verlagerbar ausgebildet und mit einem Verstellantrieb gekoppelt ist und dass der Einhausung ein Dichtelement zur Abdichtung eines Spaltes zwischen der Einhausung und der Sammelmulde in der geschlossenen Position zugeordnet ist. Hierzu sind verschiedene Ausführungsformen möglich. Die Sammelmulde kann einteilig oder mehrteilig ausgebildet sein und die Entleerung kann durch eine Verschiebebewegung, vorzugsweise bei einer einteiligen Bauart oder durch eine Schwenkbewegung um eine oder mehrere Schwenkachsen, vorzugsweise bei einer mehrteiligen Bauart, erfolgen. Der Sammelmulde ist ein Verstellantrieb zugeordnet, der von einem ansteuerbaren Druckmittelzylinder oder von mindestens einem angetriebenen Fahrwerksrad gebildet sein kann.An expedient embodiment is that the sump for the scrap between a closed and an open position is designed to be displaced and coupled with an adjustment and that the housing a sealing element for sealing a gap between the housing and the sump in the is associated with the closed position. For this purpose, various embodiments are possible. The sump can be formed in one or more parts and the emptying can be done by a sliding movement, preferably in a one-piece design or by a pivoting movement about one or more pivot axes, preferably in a multi-part design. The collecting trough is assigned an adjusting drive, which can be formed by a controllable pressure medium cylinder or by at least one driven landing gear wheel.

Die zwischen der Einhausung und der Sammelmulde wirksamen Dichtelemente sind zweckmäßig an der Einhausung befestigt und in der geschlossenen Position der Sammelmulde an diese anpressbar ausgebildet. Damit werden Beschädigungen des Dichtelementes bei der Manipulation der Sammelmulde und insbesondere bei der Schrottentladung vermieden.The effective between the enclosure and the sump sealing elements are suitably attached to the housing and formed in the closed position of the sump to this pressed. Damage to the sealing element in the manipulation of the collecting trough and in particular in the scrap discharge are thus avoided.

Eine bevorzugte Ausgestaltung des Dichtelementes besteht darin, dass das Dichtelement einen zur Einhausung und zur Sammelmulde relativbeweglichen und an die Sammelmulde anpressbaren Abdichtring umfasst, der von einem an der Einhausung angreifenden und an ihr befestigten Verlagerungselement getragen ist, und der mit einer steuerbaren Verschiebeeinrichtung gekoppelt ist. Hierbei kann das Verlagerungselement beispielsweise von einem Faltenbalg oder einem anderen elastischen eine Längserstreckung zulassenden Element und die steuerbare Verschiebeeinrichtung beispielsweise von einem an der Einhausung angelenkten Druckmittelzylinder gebildet sein.A preferred embodiment of the sealing element is that the sealing element comprises a relative to the housing and to the collecting trough and be pressed against the collecting cavity Abdichtring which is supported by a housing engaging on the attached and displacing element, and which is coupled to a controllable displacement device. In this case, the displacement element may be formed, for example, by a bellows or another elastic element which permits longitudinal extension, and the controllable displacement device may be formed, for example, by a pressure medium cylinder articulated on the housing.

Zweckmäßig weist die Sammelmulde ein Fahrwerk auf und diesem Fahrwerk ist eine Fahrbahn, insbesondere Schienen, zugeordnet. Durch eine entsprechende Ausgestaltung der Fahrbahn kann in bevorzugter Weise gleichzeitig mit dem Anfahren der geschlossenen Position am letzten Teilstück des Verschiebeweges der Abstand zwischen der Sammelmulde und der Einhausung bzw. dem an der Einhausung befestigten Dichtelement soweit verringert werden, dass eine abdichtende geschlossene Position selbsttätig oder mit einem geringen Verschiebeweg des Dichtelementes erreicht wird.Suitably, the collecting trough on a chassis and this chassis is a road, especially rails assigned. By an appropriate design of the roadway, the distance between the sump and the housing or attached to the housing sealing element can be reduced so far that a sealing closed position automatically or with at least simultaneously with the start of the closed position on the last section of the displacement a small displacement of the sealing element is achieved.

Nach einer alternativen Ausführungsform weist die Sammelmulde Gleitelemente auf und diesen Gleitelementen ist eine stationäre Gleitbahn zugeordnet. Durch eine entsprechende Ausgestaltung der Gleitbahn kann gleichzeitig mit dem Anfahren der geschlossenen Position am letzten Teilstück des Verschiebeweges der Abstand zwischen der Sammelmulde und der Einhausung bzw. dem an der Einhausung befestigten Dichtelement soweit verringert werden, dass eine abdichtende geschlossene Position erreicht wird.According to an alternative embodiment, the collecting trough sliding elements and these sliding elements is associated with a stationary slide. By an appropriate design of the slideway can simultaneously with the start of the closed Position on the last section of the displacement path, the distance between the sump and the housing or attached to the housing sealing element can be reduced so far that a sealing closed position is achieved.

Sofern die Entleerung der Sammelmulde während einer horizontalen Verschiebebewegung der Sammelmulde erfolgt, ist es vorteilhaft, wenn im Abstand von der Sammelmulde an der Einhausung ein Räumschwert zum Abstreifen des in der Sammelmulde angesammelten Schrottes angeordnet ist. Hierbei ist der Abstand zwischen dem Räumschwert und der Sammelmulde so gewählt, dass es zu keinem Einklemmen von Schrottteilen zwischen dem stationären Räumschwert und der Sammelmulde kommt. Das Räumschwert kann hierbei gleitend auf der Sammelmulde aufliegen. Für Notfälle ist eine Rückzugsmöglichkeit des Räumschwertes quer zur Verschiebebewegung der Sammelmulde vorgesehen.If the emptying of the collecting trough takes place during a horizontal displacement movement of the collecting trough, it is advantageous if, at a distance from the collecting trough at the housing, a wiping sword for stripping the scrap accumulated in the collecting trough is arranged. Here, the distance between the Räumschwert and the collecting tray is chosen so that there is no jamming of scrap parts between the stationary Räumschwert and the collecting trough. The reaming blade can slide on the collecting trough. For emergencies a possibility of withdrawal of the Räumschwertes is provided transversely to the sliding movement of the sump.

Die Sammelmulde umfasst einen Aufnahmebereich für den Schrott, der unterschiedlich ausgestaltet sein kann. Der Aufnahmebereich für den Schrott kann von einer ebenen Fläche gebildet sein, wobei das zugeordnete Räumschwert eine gerade Räumkante aufweist, die in einem geringen Abstand von der Oberfläche des Aufnahmebereiches angeordnet ist oder auf ihr gleitet. Der Aufnahmebereich für den Schrott kann auch als muldenförmige Vertiefung ausgeformt sein, wobei diese Vertiefung vorzugsweise an drei Seiten der Sammelmulde besteht und an der vierten Seite, an der die Entleerung der Sammelmulde stattfindet, die muldenförmige Vertiefung im Wesentlichen horizontal ausläuft. Damit ist eine Entleerung mit Hilfe eines Räumschwertes, dessen Räumkante dem Querschnitt der muldenförmigen Vertiefung angepasst ist, gleichermaßen möglich.The collecting trough comprises a receiving area for the scrap, which can be configured differently. The receiving area for the scrap may be formed by a flat surface, wherein the associated Räumschwert has a straight reaming edge, which is located at a small distance from the surface of the receiving area or slides on it. The receiving area for the scrap can also be formed as a trough-shaped depression, wherein this depression preferably exists on three sides of the collecting trough and on the fourth side, at which the emptying of the collecting trough takes place, the trough-shaped depression expires substantially horizontally. This emptying using a Räumschwertes whose Räumkante is adapted to the cross section of the trough-shaped depression, equally possible.

Um auch bei geöffneter Position der Sammelmulde den Schadlufteintritt in die Einhausung gering zu halten oder weitestgehend zu vermeiden, ist ein der Einhausung zugeordnetes Dichtelement bei geöffneter Position der Sammelmulde an den fahrbaren Schrottsammelbehälter in seiner Aufnahmeposition anpressbar ausgebildet. Eine weitere Verbesserung der Abdichtung kann erzielt werden, wenn während des laufenden Verschiebevorganges der Sammelmulde an mindestens drei Seiten eine Abdichtung zwischen dem fahrbaren Schrottsammelbehälter und der Einhausung sichergestellt ist. Dies wird durch ein mehrteiliges Dichtelement erreicht.In order to keep the damage depth into the housing low or largely avoided even when the sump open position, a sealing element associated with the housing is formed in the receiving position open position of the sump to the mobile scrap container in its receiving position. A further improvement of the seal can be achieved if a seal between the mobile scrap container and the housing is ensured on at least three sides during the ongoing displacement operation of the collecting trough. This is achieved by a multi-part sealing element.

Solcherart ist es zur Minimierung des Lufteintrittes zweckmäßig, wenn ein der Einhausung zugeordnetes Dichtelement während des Öffnens der Sammelmulde kontinuierlich oder mit Teilabschnitten an den fahrbaren Schrottsammelbehälter in seiner Aufnahmeposition anpressbar ausgebildet ist.In this way, it is expedient for minimizing the air inlet when a sealing element assigned to the housing is formed so as to be compressible continuously during opening of the collecting trough or with partial sections to the mobile scrap collecting container in its receiving position.

Nach einer möglichen Ausführungsform kann die Schadluftminimierung erreicht werden, wenn der Einhausung ein einziges umlaufendes Dichtelement zugeordnet ist, welches bei geschlossener Position der Sammelmulde an diese und bei geöffneter Position der Sammelmulde an den fahrbaren Schrottsammelbehälter anpressbar ausgebildet ist. Nach einer weiteren sehr vorteilhaften Ausführungsform kann die Schadluftminimierung erreicht werden, wenn der Einhausung zwei voneinander unabhängige Dichtelemente zugeordnet sind, wobei eines dieser Dichtelemente bei geschlossener Position der Sammelmulde an diese Sammelmulde und das zweite Dichtelement an den fahrbaren Schrottsammelbehälter anpressbar ausgebildet ist. Die beiden Dichtelemente sind vorzugsweise zueinander konzentrisch an der Außenwand der Einhausung befestigt und unabhängig voneinander betätigbar.According to a possible embodiment, the Schadluftminimierung can be achieved when the housing is assigned a single circumferential sealing element which is formed in the closed position of the sump to this and in the open position of the sump to the mobile scrap container pressed. According to a further very advantageous embodiment, the Schadluftminimierung can be achieved if the housing are assigned two independent sealing elements, one of these sealing elements is formed in the closed position of the sump to this sump and the second sealing element to the mobile scrap container pressed. The two sealing elements are preferably attached concentrically to each other on the outer wall of the enclosure and independently operable.

Eine weitere Verminderung des verbleibenden nur mehr sehr geringen Schadlufteintrages kann erreicht werden, wenn der fahrbare Schrottsammelbehälter in seiner Aufnahmeposition in einer geschlossenen Schrottkammer positioniert ist, die unterhalb der Einhausung dichtend an diese anschließt.A further reduction of the remaining only very small damage influx can be achieved if the mobile scrap container is positioned in its receiving position in a closed scrap chamber, which connects sealingly below the housing to this.

Dem Transportweg des gegossenen Metallbandes folgend, schließen an die mit Schutzgas geflutete Einhausung eine Behandlungskammer mit einer Bandtransporteinrichtung, beispielsweise ein Rollgang, und gegebenenfalls weitere Bandbehandlungseinrichtungen für das Metallband, beispielsweise ein Temperaturausgleichsofen vor einem Walzgerüst, an, wobei der Boden dieser Behandlungskammer von mindestens einem entleerbaren Sammelbehälter für Zunder und gegebenenfalls Schrott, beispielsweise Besäumschrott aus einer Bandbesäumanlage, gebildet ist.Following the transport path of the cast metal strip, close to the inert gas-flooded housing a treatment chamber with a belt conveyor, such as a roller table, and optionally further belt treatment facilities for the metal strip, such as a temperature compensation furnace in front of a rolling stand, the bottom of this treatment chamber of at least one emptying Collecting container for scale and optionally scrap, for example, trimming scrap from a Bandbesäumanlage is formed.

Vorzugsweise ist der Sammelbehälter als Sammelmulde mit einer Verschlusseinrichtung ausgebildet und kann beispielsweise von einem trichterförmigen Sammelbunker mit einer Verschlussklappe gebildet sein.Preferably, the sump is formed as a sump with a closure device and may be formed for example by a funnel-shaped collection bunker with a closure flap.

Unter den Sammelbehältern sind eine oder mehrere Aufnahmepositionen für einen verfahrbaren Schrottsammelbehälter vorgesehen. Der fahrbare Schrottsammelbehälter ist mit einer Fahrsteuerung ausgestattet, die ein gesteuertes Anfahren aller Aufnahmepositionen unterhalb des Transportweges des Metallbandes ermöglicht. Die Aufnahmepositionen sind beispielsweise durch elektrische Schleifkontakte oder Lichtschranken festgelegt.One or more receiving positions for a movable scrap collecting container are provided under the collecting containers. The mobile scrap collecting container is equipped with a travel control, which allows a controlled approach to all receiving positions below the transport path of the metal strip. The receiving positions are determined for example by electrical sliding contacts or light barriers.

Unter Verwendung der erfindungsgemäßen Zweiwalzengießeinrichtung wird ein Betriebsverfahren zum Einleiten eines Gießprozesses vorgeschlagen, welches die Ableitung und Entfernung eines ersten Teilstückes des gegossenen Metallbandes aus der Anlage ermöglicht, das in einer instationären Startphase der Zweiwalzengießanlage hergestellt wird und den Qualitätsanforderungen des zu erzeugenden Produktes noch nicht entspricht. Hierbei wird insbesondere eine Schrottmanipulation vorgeschlagen, die den Falschluftzutritt während dieser Startphase weitestgehend minimiert, aber auch die nachfolgenden Produktionsschritte und Schrottentfernung aus der Anlage mit minimiertem Luftzutritt gestattet.Using the Zweiwalzengießeinrichtung invention, an operating method for initiating a casting process is proposed which allows the derivation and removal of a first portion of the cast metal strip from the plant, which is produced in a transient start phase of the two-roll caster and the quality requirements of the product to be produced yet. Here, a scrap manipulation is proposed in particular, which minimizes the false air access during this start phase, but also allows the subsequent production steps and scrap removal from the system with minimized air access.

Diese Vorteile werden bei einer Zweiwalzengießanlage, bei der zwei um horizontale Achsen gegensinnig rotierende Gießwalzen und an diese anpressbare Seitenplatten einen Schmelzenraum für die Aufnahme von Metallschmelze und einen Gießspalt für die Formgebung eines gegossenen Metallstranges bilden und wobei Metallschmelze in den Schmelzenraum kontinuierlich oder nach einer vorgegebenen Anfahrkurve eingebracht wird und ein gegossenes Metallband aus dem Gießspalt kontinuierlich oder nach einer vorgegebenen Anfahrkurve ausgefördert wird, dadurch erreicht, dass ein in einer instationären Startphase gegossenes erstes Teilstück des Metallbandes bei einer in eine Rückzugsposition verschwenkten Umleiteinrichtung und bei einer in eine zurückgezogene geöffnete Position verlagerte Sammelmulde in im Wesentlichen vertikaler Richtung direkt in den Schrottsammelbehälter gefördert wird, dass mit Erreichen einer stationären Betriebsphase das erste Teilstück des gegossenen Metallbandes, vorzugsweise im Gießspalt abgetrennt wird, dass anschließend die Umleiteinrichtung in die Einfädelposition verschwenkt wird und dass das nachfolgende gegossene Metallband in eine im Wesentlichen horizontale Transportrichtung geleitet wird und anschließend oder gleichzeitig die Sammelmulde in die geschlossene Position verlagert wird.These advantages are in a two-roll caster, in which two casting rolls rotating about horizontal axes and pressing side plates form a melt space for receiving molten metal and a casting gap for molding a cast metal strand, and molten metal in the melt space continuously or after a predetermined Anfahrkurve is introduced and a cast metal strip from the casting gap is discharged continuously or after a predetermined Anfahrkurve, achieved by a cast in a transient start phase first portion of the metal strip at a deflected in a retraction position diverter and in a retracted open position displaced collection trough in in a substantially vertical direction is conveyed directly into the scrap container, that upon reaching a stationary phase of operation, the first portion of the cast metal strip, before is preferably separated in the casting gap, that then the diverter is pivoted to the threading and that the subsequent cast metal strip is passed in a substantially horizontal transport direction and then or at the same time the sump is moved to the closed position.

Die eigentliche Startprozedur kann auf verschiedene Art und Weise erfolgen. In einem ersten Schritt wird Metallschmelze bis zu einem Betriebsgießspiegel in den Schmelzenraum eingebracht und während dieses Füllvorganges mit dem Ausfördern des Metallbandes begonnen. Dieser Vorgang kann mit stehenden oder bereits rotierenden Gießwalzen beginnen. Auch der Gießspalt kann in seiner Breite von einer Betriebsgießspaltbreite abweichen. Insgesamt können der Füllvorgang im Schmelzenraum, die Gießgeschwindigkeit und die Gießspaltbreite einer vorgegebenen Anfahrkurve folgen. Das Abtrennen des solcherart unter instationären Gießbedingungen hergestellten ersten Teilstückes erfolgt unter Wirkung des Eigengewichtes dieses Bandabschnittes. Auch hierbei können die Gießgeschwindigkeit und die Gießspaltbreite einer Verlaufskurve folgen. Ein bevorzugtes Startverfahren für den Gießprozess in einer Zweiwalzengießanlage ohne Berücksichtigung der Schrottwirtschaft ist im Detail bereits in der österreichischen Patentanmeldung AT-A 1367/2002 beschrieben und als integrierter Bestandteil dieser Anmeldung zu betrachten.The actual startup procedure can be done in different ways. In a first step, molten metal is introduced into the melt space up to an operating molten metal level and the discharge of the metal strip is started during this filling process. This process can begin with standing or already rotating casting rolls. Also, the casting gap may differ in width from a Betriebsgießspaltbreite. Overall, the filling process in the melting chamber, the casting speed and the casting gap width can follow a given starting curve. The separation of the first section thus produced under unsteady casting conditions takes place under the effect of the dead weight of this strip section. Here, too, the casting speed and the casting gap width can follow a course curve. A preferred starting method for the casting process in a two-roll casting plant without consideration of the scrap industry is described in detail already in the Austrian patent application AT-A 1367/2002 and considered as an integral part of this application.

Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung nicht einschränkender Ausführungsbeispiele, wobei auf die beiliegenden Figuren Bezug genommen wird, die folgendes zeigen:

Fig. 1
einen Längsschnitt durch eine Zweiwalzengießanlage mit einer erfindungsgemäßen Entleereinrichtung,
Fig. 2
eine Ausführungsform eines Dichtelementes zwischen der Einhausung und einer Sammelmulde bzw. einem Schrottsammelbehälter,
Fig. 3
einen ersten Betriebsfall der erfindungsgemäßen Zweiwalzengießanlage,
Fig. 4
einen zweiten Betriebsfall der erfindungsgemäßen Zweiwalzengießanlage,
Fig. 5
einen dritten Betriebsfall der erfindungsgemäßen Zweiwalzengießanlage,
Fig. 6
eine weitere Ausführungsform eines Dichtelementes zwischen der Einhausung und einer Sammelmulde bzw. einem Schrottsammelbehälter.
Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the attached figures, which show:
Fig. 1
a longitudinal section through a two-roll caster with an emptying device according to the invention,
Fig. 2
an embodiment of a sealing element between the housing and a collecting trough or a scrap container,
Fig. 3
a first operating case of the two-roll casting machine according to the invention,
Fig. 4
a second operating case of the two-roll caster according to the invention,
Fig. 5
a third operating case of the two-roll caster according to the invention,
Fig. 6
a further embodiment of a sealing element between the housing and a collecting trough or a scrap collecting container.

Fig. 1 zeigt in schematischer Darstellung eine Zweiwalzengießanlage der erfindungsgemäßen Art zur kontinuierlichen Herstellung eines Stahlbandes. Die Zweiwalzengießanlage besteht mit ihrer Kerneinrichtung zur Ausbildung des Metallbandes aus zwei um horizontale Achsen gegensinnig rotierende, angetriebene Gießwalzen 1, 2, die zusammen mit zwei Seitenplatten 3, von denen nur eine in Fig. 1 dargestellt ist, einen Schmelzenraum 4 für die Aufnahme von Metallschmelze bilden, die aus einem Zwischengefäß 5 über ein Tauchrohr 6 in den Schmelzenraum 4 zugeführt wird und dort ein Schmelzenbad bildet. Der Schmelzenraum 4 ist mit einer Abdeckung 7 weitgehend luftdicht abgeschlossen, die die Aufrechterhaltung einer Schutzgasatmosphäre über dem Schmelzenbad ermöglicht.Fig. 1 shows a schematic representation of a Zweiwalzengießanlage the inventive type for the continuous production of a steel strip. The Zweiwalzengießanlage consists with its core device for forming the metal strip of two horizontal axes in opposite directions rotating, driven casting rolls 1, 2, which together with two side plates 3, of which only one is shown in Fig. 1, a Form melting chamber 4 for receiving molten metal, which is supplied from an intermediate vessel 5 via a dip tube 6 in the melting chamber 4 and forms a melt there. The melting chamber 4 is largely hermetically sealed with a cover 7, which allows the maintenance of a protective gas atmosphere over the melt bath.

Die beiden gekühlten Gießwalzen 1, 2 und die an die Stirnseiten der Gießwalzen anliegenden Seitenplatten 3 bilden einen Gießspalt 8, aus dem die zuvor an den Gießwalzenoberflächen in Form von Strangschalen erstarrte Metallschmelze als gegossenes Metallband 9 in vertikaler Gießrichtung ausgefördert und in eine horizontale Transportrichtung umgelenkt mit einem Treibrollengerüst 10 verschiedenen Weiterverarbeitungseinrichtungen in Pfeilrichtung zugeführt wird. Zur Umlenkung des Metallbandes 9 in die horizontale Transportrichtung ist eine schwenkbare kufenförmige Umleiteinrichtung 11 unterhalb des Gießspaltes 8 vorgesehen, die von einer mit dicken Linien dargestellten Einfädelposition, in der das Metallband 9 zum Treibrollengerüst 10 umgeleitet wird, in eine im Wesentlichen vertikale mit strichpunktierten Linien dargestellte Rückzugsposition verschwenkt werden kann. In dieser Rückzugsposition können Bandabschnitte, wie sie insbesondere zu Gießbeginn und am Gießende anfallen, als Schrott vertikal nach unten entsorgt werden.The two cooled casting rolls 1, 2 and the adjacent to the faces of the casting rolls side plates 3 form a casting gap 8, from which the previously solidified on the casting roll surfaces in the form of strand shells molten metal as cast metal strip 9 in the vertical casting direction and deflected in a horizontal transport direction with a drive roller frame 10 different processing devices is supplied in the arrow direction. For deflecting the metal strip 9 in the horizontal transport direction, a pivotable skid-shaped diverter 11 is provided below the Gießspaltes 8, which is shown by a thick lines shown Einfädelposition in which the metal strip 9 is redirected to the traction roller frame 10 in a substantially vertical dash-dotted lines Retraction position can be pivoted. In this retraction position tape sections, such as those incurred in particular at the start of casting and at the end of the casting, can be disposed of as scrap vertically downwards.

Der Transportweg des Metallbandes 9 vom Austritt aus dem Gießspalt 8 bis zum Eintritt in das Treibrollengerüst 10 ist von einer Einhausung 13 umgrenzt, die üblicherweise von Blechwänden mit einer feuerfesten Auskleidung an deren Innenseite gebildet ist. Im Eintrittsbereich des Metallbandes in die Einhausung 13 sind zwischen der Wandung der Einhausung und den Gießwalzen 1, 2 bzw. den Seitenplatten 3 nicht dargestellte Dichtungen vorgesehen, wie sie in der österreichischen Patentanmeldung AT-A 303/2002 beschrieben sind. Im Bereich des Treibrollengerüstes 10 schließt an die Einhausung 13 eine ebenfalls mit Schutzgas geflutete Behandlungskammer 14 dichtend an, in der das Metallband auf einem Rollgang 15 weiter transportiert und nicht näher dargestellten Weiterbehandlungseinrichtungen zugeführt wird. Diese können beispielsweise thermische Behandlungen des Metallbandes in einer Bandkantenerhitzungseinrichtung oder in einem Temperaturausgleichsofen oder mechanische Behandlungen des Metallbandes in einer Bandbesäumanlage oder in Walzgerüsten umfassen.The transport path of the metal strip 9 from the exit from the casting gap 8 until it enters the drive roller frame 10 is delimited by an enclosure 13, which is usually formed by sheet metal walls with a refractory lining on the inside. In the inlet region of the metal strip into the housing 13, gaskets, not shown, are provided between the wall of the housing and the casting rolls 1, 2 or the side plates 3, as described in the Austrian patent application AT-A 303/2002. In the area of the driving roller stand 10, a treatment chamber 14, which is likewise flooded with protective gas, closes sealingly against the housing 13, in which the metal strip is transported on a roller table 15 and supplied to further processing devices, not shown. These may include, for example, thermal treatments of the metal strip in a strip edge heating device or in a temperature compensation oven or mechanical treatment of the metal strip in a stripper or in rolling stands.

Den Boden 16 der Einhausung 13 bildet eine Entleereinrichtung 17 und ist in einem Bereich unterhalb des Gießspaltes 8 von einer Sammelmulde 18 gebildet, in der herabfallende, aus dem Produktionsprozess ausgeschiedene, kurze Bandabschnitte und vom gegossenen Metallband fallweise abfallender Zunder gesammelt werden. Insbesondere das bei Gießbeginn während einer instationären Startphase gebildete Anfahrstück des gegossenen Metallbandes entspricht nicht den geforderten Produktanforderungen und wird daher zumindest teilweise nicht in die horizontale Transportrichtung zur Weiterverarbeitung zum ersten Treibrollengerüst umgelenkt, sondern unmittelbar vertikal nach unten in die Sammelmulde 18 abgeleitet. Die Sammelmulde 18 weist eine wannenförmigen Aufnahme für den Schrott auf und ist mit einem Fahrwerk 19 ausgestattet, welches Fahrräder 20 umfasst, die auf einer von einem horizontalen Längsträger oder einer Schiene gebildeten Fahrbahn 21 abrollen. Über eine an der Sammelmulde angelenkte, ansteuerbare Verschiebeeinrichtung 22, die von einem langhubigen Druckmittelzylinder 23 gebildet ist, ist die Sammelmulde 18 von einer geschlossenen in dicken Linien dargestellte Position für die Aufnahme des Schrottes in eine zurückgezogene geöffnete in strichpunktierten Linien dargestellte Position verlagerbar. Mit einem Räumschwert 27, welches in geringem Abstand oberhalb der Sammelmulde 18 und quer zu ihrer Verschieberichtung angeordnet ist, wird der angesammelte Schrott während der Verschiebebewegung in die geöffnete Position aus der Sammelmulde entfernt und in einen darunter bereitgestellten Schrottsammelbehälter 25 verbracht. Der Schrottsammelbehälter ist in einem Fahrrahmen 28 eingesetzt und kann unabhängig vom laufenden Produktionsprozess an der Zweiwalzengießanlage manipuliert werden.The bottom 16 of the housing 13 forms an emptying device 17 and is formed in a region below the Gießspaltes 8 of a collecting trough 18, are collected in the falling, excreted from the production process, short tape sections and casts of the cast metal strip falling down tinder. In particular, the Anfahrstück of the cast metal strip formed at the start of casting during a transient start phase does not meet the required product requirements and is therefore at least partially not deflected in the horizontal transport direction for further processing to the first drive pulley frame, but derived directly vertically down into the sump 18. The collecting trough 18 has a trough-shaped receptacle for the scrap and is equipped with a chassis 19 which comprises bicycles 20 which roll on a roadway 21 formed by a horizontal side member or a rail. About a hinged to the sump, controllable displacement device 22, which is formed by a long-stroke pressure cylinder 23, the sump 18 is displaceable from a closed position shown in thick lines for receiving the scrap in a retracted open in dotted lines position shown. With a Räumschwert 27, which is arranged at a small distance above the collecting trough 18 and transversely to their direction of displacement, the accumulated scrap is removed during the sliding movement in the open position from the collecting trough and spent in a provided underneath scrap container 25. The scrap container is used in a traveling frame 28 and can be manipulated independently of the ongoing production process on the two-roll caster.

Alternativ ist es auch möglich, die Fahrräder 20 mit einem nicht näher dargestellten Fahrantrieb auszustatten.Alternatively, it is also possible to equip the bikes 20 with a drive not shown.

Damit in weitgehend allen Betriebsphasen der Zweiwalzengießanlage eine möglichst vollständige Abdichtung zwischen der Einhausung 13 und der Sammelmulde 18 oder der Einhausung 13 und dem fahrbaren Schrottsammelbehälter 25 während der Rückzugsbewegung der Sammelmulde sichergestellt ist, ist zwischen diesen Bauteilen ein anstellbares Dichtelement 30 angeordnet. Eine mögliche Ausführungsform ist in Fig. 2 in einem Teilschnitt schematisch dargestellt.In order to ensure as complete a seal as possible between the housing 13 and the collecting trough 18 or the housing 13 and the mobile scrap container 25 during the return movement of the collecting trough in substantially all phases of operation of the two-roll caster, an adjustable sealing element 30 is arranged between these components. A possible embodiment is shown schematically in Fig. 2 in a partial section.

Fig. 2 zeigt einen Teilbereich des unteren Endes der Einhausung 13 und die darunter in einem Abstand positionierte Sammelmulde 18 für den Schrott. An der Außenwand 31 der Einhausung bzw. deren Tragkonstruktion ist ein umlaufender Tragflansch 32 für die Befestigung des Dichtelementes 30 angeschweißt. Auf einem Stützblech 33 der Sammelmulde 18, welches eine Dichtfläche bildet, liegt ein Dichtring 34 auf, der in einem Dichtring-Tragrahmen 35 eingelegt und dort befestigt ist. Zwischen dem Tragflansch 32 und dem Dichtring-Tragrahmen 35 ist ein eine Längenänderung zulassendes von einem Faltenbalg 36 gebildetes Verlagerungselement 37 für den Dichtring-Tragrahmen 35 angeordnet, das einerseits am Tragflansch 32 und andererseits am Dichtring-Tragrahmen 35 dichtend befestigt ist. Zwischen dem Tragflansch 32 und dem Dichtring-Tragrahmen 35 sind an mehreren Stellen, über dem Umfang der Einhausung 13 verteilt, synchron steuerbare Verschiebeeinrichtungen 38, die von Druckmittelzylindern 39 gebildet werden, angeordnet, mit denen der Dichtring 34 an das Stützblech 33 der Sammelmulde 18 in der geschlossenen Position der Sammelmulde angepresst oder von dieser abgehoben werden kann, wenn die Sammelmulde zu ihrer Entleerung in die geöffnete Position verschoben werden soll. Zum Schutz des Faltenbalgs 36 vor thermischer und mechanischer Beschädigung sind zwischen dem Faltenbalg und der Außenwand 31 der Einhausung 13 teleskopisch ineinander schiebbare Schutzbleche 40 sowohl am Tragflansch 32 als auch am Dichtring-Tragrahmen 35 befestigt.Fig. 2 shows a portion of the lower end of the housing 13 and the underlying positioned at a distance collecting trough 18 for the scrap. On the outer wall 31 of the housing or its supporting structure, a circumferential support flange 32 is welded for the attachment of the sealing element 30. On a support plate 33 of the sump 18, which forms a sealing surface, there is a sealing ring 34 which is inserted in a sealing ring supporting frame 35 and fixed there. Between the support flange 32 and the sealing ring support frame 35 is a change in length permitting formed by a bellows 36 displacement element 37 for the sealing ring support frame 35 which is attached on the one hand to the support flange 32 and the other part on the sealing ring support frame 35 sealing. Between the support flange 32 and the sealing ring support frame 35 are distributed in several places, over the circumference of the housing 13, synchronously controllable displacement devices 38, which are formed by pressure medium cylinders 39, arranged with which the sealing ring 34 to the support plate 33 of the sump 18 in the closed position of the sump can be pressed or lifted from this, if the sump is to be moved to its emptying in the open position. To protect the bellows 36 from thermal and mechanical damage, 13 telescopically telescoping fenders 40 are secured between the bellows and the outer wall 31 of the housing 31 both on the support flange 32 and on the sealing ring support frame 35.

Der Dichtring 34 ist aus einen elastischem Material wie Gewebe, Fasermaterial und ähnlichem gefertigt. Er kann aber auch durch eine andere Bauart einer Dichtung ersetzt werden, wie beispielsweise eine Sanddichtung, wobei das Stützblech an der Sammelmulde als wannenförmige Aufnahme für Sand ausgebildet ist und an Stelle des Dichtringes ein Dichtblech bei geschlossener Position der Sammelmulde in diese Sandschüttung eintaucht. Das Dichtblech ist wiederum mit einem Verlagerungselement, wie einem Druckmittelzylinder, höhenverstellbar.The sealing ring 34 is made of an elastic material such as fabric, fiber material and the like. But it can also be replaced by another type of seal, such as a sand seal, wherein the support plate is formed on the sump as a trough-shaped receptacle for sand and immersed in place of the sealing ring, a sealing sheet in the closed position of the sump in this sand fill. The sealing plate is in turn with a displacement element, such as a pressure cylinder, height adjustable.

Mit derselben Dichtung kann nicht nur eine dichtende Verbindung zwischen der Einhausung und der Sammelmulde, sondern bei geöffneter Position der Sammelmulde auch eine dichtende Verbindung zwischen der Einhausung 13 und dem fahrbaren Schrottsammelbehälter 25 hergestellt werden, wie dies in den Fig. 3 - 5 dargestellt ist.With the same seal not only a sealing connection between the housing and the sump, but in the open position of the sump and a sealing connection between the housing 13 and the mobile scrap container 25 can be made, as shown in Figs. 3-5.

In Fig. 6 ist analog zu Fig. 2 eine weitere Ausführungsform einer möglichst effizienten Abdichtung zwischen der Einhausung 13 und der darunter angeordneten Sammelmulde 18 und dem Schrottsammelbehälter 25 dargestellt. An der Außenwand der Sammelmulde 13 sind zwei voneinander unabhängig betätigbare Dichtelemente 30, 30a befestigt, wobei das Dichtelement 30, wie in Bezug auf Fig. 2 beschrieben, eine dichte Verbindung zur Sammelmulde 18 und das konzentrisch zu diesem Dichtelement 30 angeordnete weitere Dichtelement 30a eine dichte Verbindung zum Schrottsammelbehälter 25 herstellt. Der konstruktive Aufbau der beiden Dichtelemente 30, 30a ist identisch und entspricht den Ausführungen zu Fig. 2. Jedes andere gleichwirkende Dichtelement kann gleichermaßen eingesetzt werden. Durch diese doppelte Anordnung bleibt während aller Betriebsfälle stets eine dichtende Verbindung, entweder zur Sammelmulde 18 oder an zumindest drei Seiten zum Schrottsammelbehälter 25 bestehen.In Fig. 6, a further embodiment of a most efficient seal between the housing 13 and the underlying collecting trough 18 and the scrap container 25 is shown analogous to FIG. Two independently operable sealing elements 30, 30a are fastened to the outer wall of the collecting trough 13, wherein the sealing element 30, as described with reference to FIG. 2, forms a sealed connection to the collecting trough 18 and the further sealing element 30a arranged concentrically with this sealing element 30 Connects to the scrap container 25 manufactures. The structural design of the two sealing elements 30, 30a is identical and corresponds to the statements of FIG. 2. Any other equivalent sealing element can be used equally. Through this double arrangement remains during all operating cases always a sealing connection, either to the collecting trough 18 or at least three sides to the scrap container 25 exist.

In den Fig. 3 bis 5 ist die erfindungsgemäße Anordnung der Einhausung 13, der Sammelmulde 18 und des Schrottsammelbehälters 25 zueinander in drei charakteristischen Betriebsfällen veranschaulicht. Die Sammelmulde 18 ist hier wannenförmig, doppelwandig und wassergekühlt ausgeformt und mit Sand gefüllt.3 to 5, the inventive arrangement of the housing 13, the sump 18 and the scrap container 25 is illustrated to each other in three characteristic operating cases. The sump 18 is formed here trough-shaped, double-walled and water-cooled and filled with sand.

In Fig. 3 ist ein Betriebsfall veranschaulicht, wie er in der Anfahrphase des Gießprozesses auftritt. Die Schrottmulde 18 ist in die geöffnete Position verschoben, sodass die Einhausung 13 zum Schrottsammelbehälter 25 offen ist und herabfallende Bandteile direkt in den Schrottsammelbehälter fallen. Das die Einhausung 13 allseitig umfassende Dichtelement 30 liegt mit seinem Dichtring 34 auf dem Stützblech 33 des Schrottsammelbehälters 25 auf und befindet sich in seiner tiefsten Einsatzposition und schließt den Spaltraum zwischen der Einhausung und dem Schrottsammelbehälter dichtend ab.In Fig. 3, an operating case is illustrated as it occurs in the start-up phase of the casting process. The scrap tray 18 is moved to the open position, so that the housing 13 is open to the scrap container 25 and fall falling tape parts directly into the scrap container. The enclosure 13 on all sides comprehensive sealing element 30 rests with its sealing ring 34 on the support plate 33 of the scrap container 25 and is in its lowest position of use and sealingly closes the gap between the housing and the scrap container.

In Fig. 4 ist ein Betriebsfall veranschaulicht, bei dem die Sammelmulde 18 die geschlossene Position unterhalb der Einhausung 13 einnimmt und das Dichtelement 30 mit seinem Dichtring 34 auf dem Stützblech 33 der Sammelmulde 18 aufliegt. Allenfalls herabfallender Schrott und Zunder werden in der Sammelmulde gesammelt bis der Schrottsammelbehälter 25 nach seiner Entleerung wieder seine Aufnahmeposition unterhalb der geschlossenen Sammelmulde einnimmt. Während dieser geschlossenen Position der Sammelmulde 18 kann der Schrottsammelbehälter 25 ohne Beeinträchtigung des Produktionsprozesses auf der Zweiwalzengießanlage jederzeit zu seiner Entleerung kurzzeitig aus der Anlage gefahren werden.In Fig. 4, an operating case is illustrated, in which the sump 18 occupies the closed position below the housing 13 and the sealing element 30 rests with its sealing ring 34 on the support plate 33 of the sump 18. At best, falling scrap and scale are collected in the collecting trough until the scrap collecting container 25 returns to its receiving position below the closed collecting trough after it has been emptied. During this closed position of the sump 18, the scrap container 25 without interference of the production process on the two-roll caster at any time be emptied out of the system for its emptying.

Fig. 5 veranschaulicht den Betriebsfall, in dem angesammelter Schrott aus der Sammelmulde 18 in den Schrottsammelbehälter umgeleert wird. Nach dem Hochfahren des Dichtelementes 30, Welches den Spalt zwischen der Einhausung 13 und der Sammelmulde 18 luftdicht abschließt, in eine Freigabeposition, wird die Sammelmulde 18 durch eine Querbewegung in ihre geöffnete Position verbracht und gleichzeitig in der Sammelmulde angesammelter Schrott mit dem Räumschwert 27 in den Schrottsammelbehälter geschoben. Sobald die Sammelmulde die geöffnete Position erreicht hat, wird das Dichtelement 30 auf dem Schrottsammelbehälter aufgesetzt. Bei einem entlang seiner Umfangserstreckung segmentierten Dichtelement, können einzelne Segmente unmittelbar nach dem Wegbewegen der Sammelmulde auf dem Schrottsammelbehälter aufgesetzt werden.Fig. 5 illustrates the operation case in which accumulated scrap is recirculated from the sump 18 in the scrap container. After raising the sealing element 30, which closes the gap between the housing 13 and the sump 18 airtight, in a release position, the sump 18 is moved by a transverse movement in its open position and at the same time in the sump accumulated scrap with the Räumschwert 27 in the Slotted scrap container. Once the sump has reached the open position, the sealing element 30 is placed on the scrap container. In a segmented along its circumferential extent sealing element, individual segments can be placed immediately after moving away from the sump on the scrap container.

Die auf dem Transportweg des gegossenen Metallbandes der Einhausung 13 unmittelbar nachfolgende Behandlungskammer 14 kann ebenfalls mit Schutzgas geflutet werden. Wie aus Fig. 1 zu entnehmen ist, ist der Boden dieser Behandlungskammer 14 unterhalb der von einem Rollgang gebildeten Bandtransporteinrichtung 15, auf dem das noch heiße Metallband transportiert wird, mit zwei entleerbaren, trichterförmigen Sammelbehältern 41 mit Verschlussklappen 43 ausgestattet, die durch Druckmittelzylinder 42 geöffnet und geschlossen werden können. Ein mit einer Fahrsteuerung ausgestatteter Schrottsammelbehälter 25 kann in Abfolge sowohl die Entleerposition unterhalb der geschlossenen Sammelmulde 18 als auch einzelne Entleerpositionen unterhalb der Verschlussklappen 43 anfahren, die nach Einnahme der jeweiligen Entleerposition geöffnet werden. Die einzelnen Entleerpositionen sind durch Schleifkontakte oder Lichtschranken festgelegt.The treatment chamber 14 immediately following the transport path of the cast metal strip of the housing 13 can likewise be flooded with protective gas. As can be seen from Fig. 1, the bottom of this treatment chamber 14 is below the formed by a roller conveyor belt conveyor 15 on which the still hot metal belt is transported, equipped with two emptying funnel-shaped collecting containers 41 with flaps 43 which opened by pressure medium cylinder 42 and can be closed. A scavenger tank 25 equipped with a travel control can approach in succession both the emptying position below the closed collecting trough 18 and individual emptying positions below the closing flaps 43, which are opened after taking in the respective emptying position. The individual emptying positions are determined by sliding contacts or light barriers.

Claims (17)

  1. Two-roll casting installation with two casting rolls (1, 2) which rotate in opposite directions about horizontal axes, with a casting gap (8) for forming and discharging a thin cast metal strip (9), with a sealed housing (13) which has a base (16) and surrounds the conveying path for the metal strip which leaves the casting gap from a vertical casting direction into an approximately horizontal conveying direction, with diverter devices (11) for diverting the metal strip within this housing (13), and with a displaceable scrap collection container (25) for removing scrap and scale produced from the two-roll casting installation, characterized in that the base (16) of the housing (13), at least in a subregion, forms a collection trough (18) for the scrap, which is part of an emptying device (17), and in that a displaceable scrap collection container (25) is arranged in a receiving position below the emptying device (17).
  2. Two-roll casting installation according to claim 1, characterized in that the collection trough (18) for the scrap is designed such that it can be displaced between a closed position and an open position and is coupled to an adjustment device (22), and in that the housing (13) is assigned a sealing element (30) for sealing a gap between the housing (13) and the collection trough (18) in the closed position.
  3. Two-roll casting installation according to claim 2, characterized in that the sealing element (30) is secured to the housing (13) and is designed so that it can be pressed onto the collection trough (18) in the closed position of the latter.
  4. Two-roll casting installation according to claim 2 or 3, characterized in that the sealing element (30) comprises a sealing ring (34), which can move relative to the housing (13) and relative to the collection trough (18), can be pressed onto the collection trough, is supported by a displacement element (37), for example a bellows (36), acting on the housing and secured to it, and is coupled to a controllable movement device (38), for example a pressure-medium cylinder (39) articulatedly mounted on the housing (13).
  5. Two-roll casting installation according to one of the preceding claims, characterized in that the collection trough (18) has a running mechanism (19), and this running mechanism is assigned a running track (21).
  6. Two-roll casting installation according to one of claims 1 to 4, characterized in that the collection trough has sliding elements, and these sliding elements are assigned a stationary slideway.
  7. Two-roll casting installation according to one of the preceding claims, characterized in that a clearing board (27) for scraping off the collected scrap is arranged on the housing (13) at a distance from the collection trough (18).
  8. Two-roll casting installation according to one of the preceding claims, characterized in that a sealing element (30) assigned to the housing (13) is designed such that in the open position of the collection trough (18) it can be pressed onto the movable scrap collection container (25) in its receiving position.
  9. Two-roll casting installation according to one of the preceding claims 1 to 7, characterized in that a sealing element (30) assigned to the housing (13) is designed in such a manner that while the collection trough (18) is opening, it can be pressed continuously or with subsections onto the movable scrap collection container (25) in its receiving position.
  10. Two-roll casting installation according to one of the preceding claims 1 to 9, characterized in that the housing (13) is assigned a sealing element (30) which is designed in such a manner that in the closed position of the collection trough (18) it can be pressed onto the latter and in the open position of the collection trough (18) it can be pressed onto the movable scrap collection container (25).
  11. Two-roll casting installation according to one of the preceding claims 1 to 9, characterized in that the housing (13) is assigned two sealing elements (30, 30a) which are independent of one another, one of these sealing elements (30) being designed such that it can be pressed onto the collection trough (18) in the closed position of the latter, while the second sealing element (30a) is designed such that it can be pressed onto the movable scrap collection container (25).
  12. Two-roll casting installation according to one of the preceding claims, characterized in that the movable scrap collection container (25), in its receiving position, is positioned within a closed scrap chamber which adjoins the bottom of the housing in a sealed manner.
  13. Two-roll casting installation according to one of the preceding claims, characterized in that, following the conveying path for the cast metal strip (9), a treatment chamber (14) with a strip conveying device (15) and optionally further strip treatment devices for the metal strip adjoin the housing (13), and the base of this treatment chamber (14) is formed by at least one emptiable collection container (41) for scale and optionally scrap.
  14. Two-roll casting installation according to claim 13, characterized in that the collection container (41) is designed as a collection trough with a closure device (43).
  15. Two-roll casting installation according to claim 13 or 14, characterized in that one or more receiving positions for a movable scrap collection container (25) are provided beneath the collection container (41).
  16. Two-roll casting installation according to one of the preceding claims, characterized in that the movable scrap collection container (25) is equipped with a movement controller which allows it to be moved in a controlled way into all receiving positions below the conveying path for the metal strip.
  17. Method for initiating a casting process using a two-roll casting installation according to one of claims 1 to 16, in which two casting rolls (1, 2), which rotate in opposite directions about horizontal axes, and side plates (3) which can be pressed onto the casting rolls form a melt space (4) for receiving metal melt and a casting gap (8) for shaping a cast metal strand, metal melt being introduced into the melt space (4) continuously or according to a predetermined start-up curve, and a cast metal strip being discharged from the casting gap continuously or according to a predetermined start-up curve, characterized in that a first piece of the metal strip, which is cast during a starting phase without steady-state conditions, with a diverter device (11) pivoted into a retracted position and with a collection trough (18) displaced into a retracted open position, is passed in a substantially vertical direction directly into the scrap collection container, in that when a steady-state operating phase is reached, the first piece of the cast metal strip is cut off, preferably in the casting gap, in that the diverter device (11) is then pivoted into the thread-in position, and in that the metal strip which is subsequently cast is passed into a substantially horizontal conveying direction and then or at the same time the collection trough is moved into the closed position.
EP04728773A 2003-05-06 2004-04-22 Twin roll casting plant Expired - Lifetime EP1620217B1 (en)

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AT0067803A AT412539B (en) 2003-05-06 2003-05-06 Two-roll casting
PCT/EP2004/004264 WO2004098814A1 (en) 2003-05-06 2004-04-22 Twin roll casting plant

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EP1620217B1 true EP1620217B1 (en) 2006-12-13

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KR (1) KR101209825B1 (en)
CN (1) CN100534668C (en)
AT (2) AT412539B (en)
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DE (1) DE502004002305D1 (en)
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MXPA05011789A (en) 2006-01-26
ATA6782003A (en) 2004-09-15
ATE347951T1 (en) 2007-01-15
AU2004235896A1 (en) 2004-11-18
DE502004002305D1 (en) 2007-01-25
AU2004235896B2 (en) 2009-12-03
US20060118270A1 (en) 2006-06-08
KR20060011852A (en) 2006-02-03
CN100534668C (en) 2009-09-02
AT412539B (en) 2005-04-25
US7156150B2 (en) 2007-01-02
WO2004098814A1 (en) 2004-11-18
EP1620217A1 (en) 2006-02-01
KR101209825B1 (en) 2012-12-07

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