EP0361052B1 - Refractory stator-rotor unit for a nozzle gate in a vessel holding molten metal - Google Patents

Refractory stator-rotor unit for a nozzle gate in a vessel holding molten metal Download PDF

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Publication number
EP0361052B1
EP0361052B1 EP89115072A EP89115072A EP0361052B1 EP 0361052 B1 EP0361052 B1 EP 0361052B1 EP 89115072 A EP89115072 A EP 89115072A EP 89115072 A EP89115072 A EP 89115072A EP 0361052 B1 EP0361052 B1 EP 0361052B1
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EP
European Patent Office
Prior art keywords
stator
rotor
vessel
unit
transverse
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.)
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EP89115072A
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German (de)
French (fr)
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EP0361052A3 (en
EP0361052A2 (en
Inventor
Werner Keller
Rolf WALTENSPÜHL
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Stopinc AG
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Stopinc AG
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Priority to AT89115072T priority Critical patent/ATE97041T1/en
Publication of EP0361052A2 publication Critical patent/EP0361052A2/en
Publication of EP0361052A3 publication Critical patent/EP0361052A3/en
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Publication of EP0361052B1 publication Critical patent/EP0361052B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures

Definitions

  • the invention relates to a fireproof stator / rotor unit for a closure on the spout of a metal-containing vessel, which consists of a stator fastened in the vessel wall and a rotatable and / or longitudinally displaceable, for opening or. Closing the closure serving rotor exists, the unit protrudes into the melt and therein has at least one transverse pouring opening which leads from the container.
  • a closure (US Pat. No. 3,651,998) of the type mentioned shows a stator projecting into the melt and a rotatable rotor arranged concentrically therein. The rotor is pressed against the closed stator by springs acting on its lower end face.
  • the melt flows from several transverse bores into the central opening of the rotor and from there to the spout. Since a relatively large clearance is provided between the outer diameter of the rotor and that of the bore of the stator, the inflow of molten metal can hardly be prevented in the resulting gap, even when gas is supplied. This will freeze very quickly and cause the rotor to jam.
  • the tensile force acting on the stator from the springs via the rotor is not unobjectionable, since the refractory material to be used for the stator itself can only absorb very small tensile forces and is also weakened by the transverse bores mentioned.
  • An inflow actuator according to DE-PS 35 40 202 provides two concentrically arranged tubes which protrude into a storage vessel and can be moved relative to one another with openings for melt passage, in which the inner tube is fixed in the pouring opening of the container and the outer tube is placed over it.
  • the melt can be poured off in a regulated manner by correspondingly rotating or longitudinally displacing the outer tube.
  • a relatively complex mechanism located above the vessel is necessary for rotating the tube. This must not exert any transverse forces on these pipes, otherwise the inner standing pipe would break off. If the storage vessel is an intermediate container, the space is normally very limited because of the pan arranged directly above it, which is disadvantageous in the arrangement mentioned.
  • the present invention is based on the object of developing the closure according to the type described at the outset in such a way that it is simple and space-saving in construction with great operational reliability and absolute functionality.
  • the object is achieved according to the invention in that the rotor guided through the stator can be driven from the bottom of the vessel and in that a cylindrical surface surrounding the transverse opening (s) is provided between the rotor and the stator in almost the entire area inside the vessel, while in the area lying in the vessel wall there is a game absorbing their different thermal expansions to prevent the unit from jamming.
  • the rotor is arranged concentrically in the stator, has a central flow opening and at least one transverse opening connecting it and lying inside the vessel.
  • the stator has a pouring opening lying transversely and connected to it and leading out of the vessel, and the rotor is only arranged in the region of the transverse opening within the stator so that it can rotate and / or move longitudinally.
  • a gas supply of an inert gas is preferably provided in the lower region between the rotor and the stator. This almost completely prevents air from being sucked into the melt.
  • the transverse opening in the stator is to be arranged at such a distance above the inner wall of the vessel that the cold and contaminated melt collecting directly above the bottom wall does not flow away.
  • the stator is preferably inserted with a vertical axis in the bottom of the vessel, but could also be implemented in the side wall with horizontal spout, in particular in the case of pans containing aluminum melt.
  • the stator contains at least one annular groove in the bore provided for the Roltor, which is arranged below the transverse flow opening and is surrounded by the sealing cylindrical surface. Radial through openings connect this annular groove to the inside of the vessel.
  • the melt flowing through the openings in the stator or rotor normally results in a negative pressure, including in the sealing gap between the rotor and stator, which can cause air to be sucked in from the outside. With this ring groove, the vacuum is interrupted and practically prevented from being sucked in.
  • a closure 10 according to FIG. 1 is arranged in the spout 13 of the vessel wall 14 of a partially illustrated vessel 11, the latter consisting of a steel jacket 12 and a refractory wall 14 and can be, for example, a pan or an intermediate container for molten steel.
  • the closure 10 essentially consists of a refractory stator 15 embedded in the vessel wall 14, a refractory rotor 16 rotatably mounted therein and a drive mechanism 24.
  • the rotor 16 is held in a housing 25 and coupled via a drive connection (not shown) to a rotating ring 21 which is driven by a drive motor in a controllable manner via a pinion 26.
  • the stator 15 is designed as a sleeve and has a conical outer surface for the purpose of placing it in the vessel wall 14 without problems. It extends into the interior of the vessel 11 and has two transverse openings 17 and 18 therein, which are round, but also have a different cross-sectional shape, such as can be designed as elongated holes in the horizontal or vertical direction.
  • the concentrically guided in the stator 15 rotor 16 has an axially extending blind hole 19 'and with the aforementioned openings 17 and 18 communicating transverse openings 19 which have a defined distance, approximately 20 to 70 mm, from the inner wall 14'.
  • the closure In the position shown, the closure is in the open position and, for example, molten steel can flow through the openings 17, 18 and 19 into a mold in a controllable manner.
  • the rotor can also be designed as a dip tube extended into the melt of the mold.
  • Fig.2 shows a variant of a refractory stator / rotor unit similar to that of Figure 1, but in which only a transverse opening 31 and a spout 31 'connected thereto in the Rotor 33 is provided and the stator 32 is hat-shaped. Again, a sealing cylindrical surface 30 is provided between the latter and the rotor 33 within the area in the melt. The inside diameter of the stator is widened within the vessel wall 14 in order to achieve the aforementioned play 34. At the lower end of the stator bore, an annular gap 35 is formed with a connecting line 36 into which inert gas, for example argon, is blown in to prevent air intake.
  • the transverse opening 31 is guided obliquely down into the pouring opening 31 ', but could also be arranged vertically to the latter.
  • a unit according to Fig.3 and Fig.4 in turn consists of a refractory sleeve designed in the vessel wall 14 stator 42 and a rotatably guided refractory rotor 43.
  • a transverse opening 41 and a pouring opening 41 'emanating therefrom in the rotor 43 allow the pouring of melt from the container 11.
  • the stator 42 has an annular groove 44 in its bore and leading radial openings 44 'into this, which between the transverse opening 41 and the inner wall 14' of the vessel 11 come to lie.
  • the sealing cylindrical surface 40 between the stator 42 and the rotor 43 surrounds the opening 41 and also this annular groove 44, so that the melt located in this annular groove 44 is prevented from escaping.
  • a play 46 is again provided in the area lying in the vessel wall 14, which is achieved by tapering the outer diameter of the rotor.
  • a closure 50 according to FIG. 5 has a refractory stator / rotor unit, in which a frustoconical stator 52 is mortared into the spout 13 of the pan 11, has a sacklock-shaped opening 54 and a transverse opening 55 connected to it in the longitudinal direction, and a rotor 53 in the area of transverse opening 55 is rotatably and / or longitudinally displaceable in it.
  • a sealing cylindrical surface 56 is provided between the rotor 53 and the stator 52, which extends approximately over the entire area of the unit lying in the melt. Between the drive shaft 53 'and the surrounding bore in the stator 52, a defined game 57 is provided, with which jamming of the shaft 53' is avoided in this bore.
  • the rotor 53 can either be rotated or shifted in the longitudinal direction for the purpose of opening or closing the closure 50.
  • a pouring tube 58 is connected to the flow opening 54 of the stator 52 and usually extends into the melt of a mold.
  • the stator 52 contains a refractory high-value insert 52 ′ surrounding the rotor 53 ⁇ for the purpose of increasing the service life, which is preferably embedded in the refractory cast stator 52.
  • the flow opening 55 runs differently from the variant according to FIG. 5 insofar as it, after having passed through the sealing surface 56 'between the rotor 53 ⁇ and the stator 52, is brought out of it approximately in the middle of the rotor 53 ⁇ .
  • the refractory stator 52 contains below its transverse opening 55 an annular groove 60 surrounding the rotor 53, which is connected to the inside of the vessel via at least one opening 61 and from the sealing cylindrical surface 56 between the rotor 53 and the stator 52' surround is.
  • this makes it possible to avoid undesired air being sucked into the melt located in the transverse opening 55 and there leading to reoxidation of the liquid steel.
  • FIG. 8 and 9 each show a variant of the closure 10 shown in FIG. 1.
  • the stator 15 'and the rotor 16' which is rotatably guided in it according to FIG. 8 each have a mutually contacting one another in the operating state and perpendicular to the cylindrical surface 20 running ring surface 75.76.
  • These ring surfaces form an additional seal in addition to the sealing surface 20 provided in any case between the stator 15 'and the rotor 16'. This prevents metal melt from flowing into the widened space between the stator and the rotor in the region located within the vessel wall.
  • the stator / rotor unit 15 ⁇ , 16 ⁇ differs from that according to Figure 8 only in that the additional sealing ring surfaces 75 ', 76' at an incline, preferably between 30 ° and 60 ° to the cylindrical sliding surface 20 run and the rotor 16 ⁇ has put on an annular seal 77, which is made of a refractory material with good sliding properties, such as Graphite. To center it, this ring seal 77 is positioned on a stop surface 78 on the rotor 16 ⁇ .
  • the ring seal could of course also be embedded in the stator 15 ⁇ .
  • Stator and rotor 15 ', 16' respectively. 15 ⁇ , 16 ⁇ are advantageously pressed against each other on these ring surfaces under a slight contact pressure (a few kilograms).
  • stator / rotor units described are particularly intended for vessels with molten steel, in which they are arranged in the bottom of the vessel with a vertical spout. However, it would preferably be conceivable for vessels with light metal melts to be installed in the side wall with a horizontal spout.

Abstract

The refractory stator/rotor unit for a nozzle gate of a vessel (11) containing molten metal consists of a stator (15) fastened in the vessel wall (14), and of a rotor (16), which is rotatable in the latter from the underside (11') of the base of the vessel and serves for opening or closing the gate. The unit projecting into the vessel has transverse openings (17, 18) extending therein and, starting from these openings (17, 18), a nozzle opening (19) leading out of the vessel. In the entire region lying within the vessel, a sealing cylindrical surface (20), surrounding the transverse openings (17, 18) is provided between the rotor (16) and the rotator (15) while in the region lying in the vessel wall (14) a clearance (22), compensating for the different thermal expansions of stator and rotor, is provided in order to prevent the unit from seizing. A gate system is thus provided which is very simple and space-saving and functions with high operational reliability. <IMAGE>

Description

Die Erfindung betrifft eine feuerfeste Stator/Rotor-Einheit für einen Verschluss am Ausguss eines Metallschmelze enthaltenden Gefässes, welche aus einem in der Gefässwandung befestigten Stator und einem in diesem drehbaren und/oder längsverschiebbaren, zum Oeffnen resp. Schliessen des Verschlusses dienenden Rotor besteht, die Einheit dabei in die Schmelze hineinragt und darin mindestens eine querliegende und von dieser ausgehend aus dem Behälter führende Ausgussöffnung aufweist.The invention relates to a fireproof stator / rotor unit for a closure on the spout of a metal-containing vessel, which consists of a stator fastened in the vessel wall and a rotatable and / or longitudinally displaceable, for opening or. Closing the closure serving rotor exists, the unit protrudes into the melt and therein has at least one transverse pouring opening which leads from the container.

Bei einem Verschluss (US-PS 3,651,998) der genannten Gattung ist ein in die Schmelze hineinragender Stator und ein in diesem konzentrisch angeordneter drehbarer Rotor gezeigt. Der Rotor ist dabei von an seiner unteren Stirnseite angreifenden Federn gegen den oben geschlossenen Stator gepresst. Bei geöffnetem Verschluss fliesst die Schmelze von mehreren querliegenden Bohrungen in die zentrale Oeffnung des Rotors und von dort zum Ausguss. Da zwischen dem äusseren Durchmesser des Rotors und dem der Bohrung des Stators ein relativ grosses Spiel vorgesehen ist, kann bei dem daraus enstehenden Spalt auch bei Zuführung von Gas ein Einfliessen von Metallschmelze kaum verhindert werden. Diese wird sehr schnell einfrieren und ein Verklemmen des Rotors bewirken. Zudem ist die von den Federn über den Rotor auf den Stator wirkende Zugkraft nicht unbedenklich, da das für den Stator zu verwendende feuerfeste Material an sich nur sehr geringe Zugkräfte aufnehmen kann und überdies durch die genannten Querbohrungen geschwächt ist.A closure (US Pat. No. 3,651,998) of the type mentioned shows a stator projecting into the melt and a rotatable rotor arranged concentrically therein. The rotor is pressed against the closed stator by springs acting on its lower end face. When the closure is open, the melt flows from several transverse bores into the central opening of the rotor and from there to the spout. Since a relatively large clearance is provided between the outer diameter of the rotor and that of the bore of the stator, the inflow of molten metal can hardly be prevented in the resulting gap, even when gas is supplied. This will freeze very quickly and cause the rotor to jam. In addition, the tensile force acting on the stator from the springs via the rotor is not unobjectionable, since the refractory material to be used for the stator itself can only absorb very small tensile forces and is also weakened by the transverse bores mentioned.

Ein Zuflussstellglied gemäss der DE-PS 35 40 202 sieht zwei konzentrische zueinander angeordnete, in ein Vorratsgefäss hineinragende und gegeneinander bewegbare Rohre mit Durchbrüchen für den Schmelzendurchtritt vor, bei dem das innere Rohr in der Ausgussöffnung des Behälters fixiert und das äussere Rohr darübergestülpt ist. Durch entsprechendes Dreh- bzw. Längsverschieben des äusseren Rohres lässt sich die Schmelze reguliert abgiessen. Für das Drehen des Rohres ist ein relativ aufwendiger, oberhalb des Gefässes befindlicheer Mechanismus notwendig. Dieser darf keinerlei Querkräfte auf diese Rohre ausüben, ansonsten das innere stehende Rohr abbrechen würde. Handelt es sich beim Vorratsgefäss um einen Zwischenbehälter, sind normalerweise die Platzverhältnisse wegen der unmittelbar über ihm angeordneten Pfanne sehr beschränkt, was bei der genannten Anordnung ungünstig ist.An inflow actuator according to DE-PS 35 40 202 provides two concentrically arranged tubes which protrude into a storage vessel and can be moved relative to one another with openings for melt passage, in which the inner tube is fixed in the pouring opening of the container and the outer tube is placed over it. The melt can be poured off in a regulated manner by correspondingly rotating or longitudinally displacing the outer tube. A relatively complex mechanism located above the vessel is necessary for rotating the tube. This must not exert any transverse forces on these pipes, otherwise the inner standing pipe would break off. If the storage vessel is an intermediate container, the space is normally very limited because of the pan arranged directly above it, which is disadvantageous in the arrangement mentioned.

Der vorliegenden Erfindung liegt demgegenüber die Aufgabe zugrunde, den Verschluss nach der eingangs beschriebenen Gattung so weiterzubilden, dass dieser bei grosser Betriebssicherheit und absoluter Funktionstüchtigkeit einfach und platzsparend gebaut ist.In contrast, the present invention is based on the object of developing the closure according to the type described at the outset in such a way that it is simple and space-saving in construction with great operational reliability and absolute functionality.

Die Aufgabe ist erfindungsgemäss dadurch gelöst, dass der durch den Stator geführte Rotor vom Gefässboden aus antreibbar ist und dass dabei zwischen dem Rotor und dem Stator in dem annähernd gesamten innerhalb des Gefässes liegenden Bereich eine die querliegende Oeffnung/en umgebende abdichtende zylindrische Fläche vorgesehen ist, während in dem in der Gefässwandung liegenden Bereich ein deren unterschiedliche Wärmeausdehnungen aufnehmendes Spiel zur Verhinderung eines Klemmens der Einheit vorgesehen ist.The object is achieved according to the invention in that the rotor guided through the stator can be driven from the bottom of the vessel and in that a cylindrical surface surrounding the transverse opening (s) is provided between the rotor and the stator in almost the entire area inside the vessel, while in the area lying in the vessel wall there is a game absorbing their different thermal expansions to prevent the unit from jamming.

In der Kombination der genannten Merkmale ergibt sich ein vom Stand der Technik erheblich abhebender Verschluss. Dadurch, dass zwischen dem Rotor und dem Stator praktisch keine Spannkräfte wirken und der Rotor vom Gefässboden aus antreibbar ist, kann ein sehr kleindimensionierter und platzsparender Antrieb vom Boden des Gefässes aus verwendet werden. Die abdichtende zylindrische Fläche im Bereich innerhalb des Gefässes und das vorgesehene Spiel in der Gefässwandung zwischen Rotor und Stator führen zu einem, den Bedingungen im Stahlwerksbetrieb sehr gut angepassten Verschlussystem. Für ein sicheres Verhindern eines Klemmens der Einheit ist der Bohrungsdurchmesser des Stators im Bereich in der Gefässwandung gegenüber dem im Gefässinneren aufgeweitet und/oder der Aussendurchmesser des Rotors verkleinert. Damit ist deren sehr unterschiedlichen Wärmeausdehnungen Rechnung getragen. Bei einigen Zehntelmillimetern Spiel zwischen Rotor und Stator ist zudem gewährleistet, dass bei auf den Rotor wirkenden Querkräften dieser vom Stator trotzdem über seine gesamte Länge geführt ist und damit ein Abbrechen desselben verhindert werden kann.The combination of the features mentioned results in a closure which is significantly different from the prior art. Because there are practically no clamping forces between the rotor and the stator and the rotor can be driven from the bottom of the vessel, a very small and space-saving drive can be used from the bottom of the vessel. The sealing cylindrical surface in the area within the vessel and the intended play in the vessel wall between the rotor and stator lead to a closure system that is very well adapted to the conditions in steel mill operation. To reliably prevent the unit from jamming, the bore diameter of the stator in the region in the vessel wall is widened compared to that in the interior of the vessel and / or the outer diameter of the rotor is reduced. This takes their very different thermal expansions into account. With a few tenths of a millimeter of play between the rotor and the stator, it is also ensured that, in the event of transverse forces acting on the rotor, the latter is nevertheless guided over its entire length by the stator and it can thus be prevented from breaking off.

Bei einer vorteilhaften Ausbildung der Einheit ist der Rotor konzentrisch im Stator angeordnet, weist eine zentral verlaufende Durchflussöffnung und mindestens eine diese verbindende, innerhalb des Gefässes liegende quere Oeffnung auf. Diese Ausführung ergibt zusammen mit der Statorausbildung als Hülse eine einfache und herstellungsmässig kostengünstige Variante der Erfindung.In an advantageous embodiment of the unit, the rotor is arranged concentrically in the stator, has a central flow opening and at least one transverse opening connecting it and lying inside the vessel. This design, together with the stator design as a sleeve, results in a simple and inexpensive variant of the invention.

Insbesondere bei Verwendung eines Giessrohres unterhalb der Einheit kann es von Vorteil sein, dass dieses an einem stationären Teil des verschlusses angeschlossen ist. Dies ist erfindungsmässig so gelöst, dass der Stator eine querliegende und mit dieser verbundene, aus dem Gefäss führende Ausgussöffnung hat und der Rotor nur im bereich der querliegenden Oeffnung innerhalb drehbar und/oder längsverschiebbar des Stators angeordnet ist.In particular when using a pouring tube below the unit, it can be advantageous that it is connected to a stationary part of the closure. According to the invention, this is achieved in such a way that the stator has a pouring opening lying transversely and connected to it and leading out of the vessel, and the rotor is only arranged in the region of the transverse opening within the stator so that it can rotate and / or move longitudinally.

Im unteren Bereich zwischen Rotor und Stator ist vorzugsweise eine Gaszuführung von einem Inertgas vorgesehen. Damit lässt sich ein Ansaugen von Luft in die Schmelze nahezu vollständig verhindern.A gas supply of an inert gas is preferably provided in the lower region between the rotor and the stator. This almost completely prevents air from being sucked into the melt.

Die querliegende Oeffnung im Stator ist mit einem solchen Abstand über der Gefässinnenwandung anzuordnen, dass nicht die unmittelbar über der Bodenwandung sich ansammelnde kalte und verunreinigte Schmelze abfliesst.The transverse opening in the stator is to be arranged at such a distance above the inner wall of the vessel that the cold and contaminated melt collecting directly above the bottom wall does not flow away.

Der Stator ist vorzugsweise mit vertikaler Achse im Gefässboden eingesetzt, könnte insbesondere bei Aluminiumschmelze enthaltenden Pfannen aber auch in der Seitenwand mit horizontalem Ausguss realisiert sein.The stator is preferably inserted with a vertical axis in the bottom of the vessel, but could also be implemented in the side wall with horizontal spout, in particular in the case of pans containing aluminum melt.

Bei einer weiteren sehr vorteilhaften Ausbildung der erfindungsgemässen Einheit enthält der Stator in der für den Roltor vorgesehenen Bohrung mindestens eine Ringnut, die unterhalb der querliegenden Durchflussöffnung angeordnet und von der abdichtenden zylindrischen Fläche umgeben ist. Radiale durchgehende Oeffnungen verbinden diese Ringnut mit dem Innern des Gefässes. Die in den Oeffnungen im Stator bzw. Rotor durchfliessende Schmelze bewirkt normalerweise einen Unterdruck, so auch in dem dichtenden Spalt zwischen Rotor und Stator, was ein Luftansaugen von Aussen hervorrufen kann. Mit dieser Ringnut wird der Unterdruck unterbrochen und damit auch ein Luftansaugen praktisch verhindert.In another very advantageous embodiment of the unit according to the invention, the stator contains at least one annular groove in the bore provided for the Roltor, which is arranged below the transverse flow opening and is surrounded by the sealing cylindrical surface. Radial through openings connect this annular groove to the inside of the vessel. The melt flowing through the openings in the stator or rotor normally results in a negative pressure, including in the sealing gap between the rotor and stator, which can cause air to be sucked in from the outside. With this ring groove, the vacuum is interrupted and practically prevented from being sucked in.

Die Erfindung ist anhand von Ausführungsbeispielen gemäss Zeichnung erläutert. Es zeigt:

Fig. 1
einen im Längsschnitt schematisch dargestellten Verschluss,
Fig. 2
eine Variante des Verschlusses nach Fig. 1 im Längsschnitt,
Fig. 3
eine weitere Variante im Längsschnitt,
Fig. 4
einen Querschnitt des Verschlusses nacht Fig. 3 entlang der Linie IV-IV,
Fig. 5
einen erfindungsgemässen Verschluss im Längsschnitt,
Fig. 6 und Fig. 7
zwei Varianten von Stator-Ausbildungen des Verschlusses nach Fig.5 im Längsschnitt,
Fig.8 und Fig.9
je einen Teilschnitt weiterer Varianten von erfindungsgemässen Stator/Rotor-Einheiten.
The invention is explained using exemplary embodiments according to the drawing. It shows:
Fig. 1
a closure shown schematically in longitudinal section,
Fig. 2
2 shows a variant of the closure according to FIG. 1 in longitudinal section,
Fig. 3
another variant in longitudinal section,
Fig. 4
3 along the line IV-IV,
Fig. 5
a closure according to the invention in longitudinal section,
6 and 7
two variants of stator designs of the closure according to FIG. 5 in longitudinal section,
Fig. 8 and Fig. 9
A partial section of further variants of stator / rotor units according to the invention.

Ein Verschluss 10 nach Fig.1 ist im Ausguss 13 der Gefässwandung 14 eines teilweise dargestellten Gefässes 11 angeordnet, wobei letzteres aus einem Stahlmantel 12 und einer feuerfesten Wandung 14 besteht und bspw. eine Pfanne oder ein Zwischenbehälter für Stahlschmelzen sein kann. Der Verschluss 10 setzt sich im wesentlichen aus einem in der Gefässwandung 14 eingebetteten feuerfesten Stator 15, einem in diesem drehbar gelagerten feuerfesten Rotor 16 und einem Antriebsmechanismus 24 zusammen.A closure 10 according to FIG. 1 is arranged in the spout 13 of the vessel wall 14 of a partially illustrated vessel 11, the latter consisting of a steel jacket 12 and a refractory wall 14 and can be, for example, a pan or an intermediate container for molten steel. The closure 10 essentially consists of a refractory stator 15 embedded in the vessel wall 14, a refractory rotor 16 rotatably mounted therein and a drive mechanism 24.

Der Rotor 16 ist in einem Gehäuse 25 gehalten und über eine nicht gezeigt Mitnahmeverbindung mit einem Drehkranz 21 gekoppelt, der über ein Ritzel 26 von einem Antriebsmotor steuerbar angetrieben ist.The rotor 16 is held in a housing 25 and coupled via a drive connection (not shown) to a rotating ring 21 which is driven by a drive motor in a controllable manner via a pinion 26.

Der Stator 15 ist als Hülse ausgebildet und hat eine konische Aussenfläche zwecks problemlosem Setzen desselben in der Gefässwandung 14. Er erstreckt sich bis ins Innere des Gefässes 11 und hat darin zwei querliegende Oeffnungen 17 und 18, die rund sind, aber auch als andere Querschnittsform, wie z.B. als Langlöcher in horizontaler oder vertikaler Richtung ausgebildet sein können. Der konzentrisch im Stator 15 geführte Rotor 16 weist eine axial verlaufende Sacklochbohrung 19′ und mit den genannten Oeffnungen 17 und 18 kommunizierende querliegende Oeffnungen 19 auf, die einem definierten Abstand, ungefähr 20 bis 70 mm, von der Gefäss-Innenwandung 14′ haben. In der gezeichneten Stellung befindet sich der Verschluss in Offenstellung und es kann bspw. Stahlschmelze durch die Oeffnungen 17, 18 und 19 regelbar in eine Kokille abfliessen. Der Rotor kann überdies als bis in die Schmelze der Kokille verlängertes Tauchrohr ausgebildet sein.The stator 15 is designed as a sleeve and has a conical outer surface for the purpose of placing it in the vessel wall 14 without problems. It extends into the interior of the vessel 11 and has two transverse openings 17 and 18 therein, which are round, but also have a different cross-sectional shape, such as can be designed as elongated holes in the horizontal or vertical direction. The concentrically guided in the stator 15 rotor 16 has an axially extending blind hole 19 'and with the aforementioned openings 17 and 18 communicating transverse openings 19 which have a defined distance, approximately 20 to 70 mm, from the inner wall 14'. In the position shown, the closure is in the open position and, for example, molten steel can flow through the openings 17, 18 and 19 into a mold in a controllable manner. The rotor can also be designed as a dip tube extended into the melt of the mold.

Erfindungsgemäss ist zwischen dem Stator 15 und dem vom Gefässboden 11′ aus antreibbaren Rotor 16 in dem innerhalb der Schmelze liegenden Bereich eine die Oeffnungen 17 und 18 umgebende abdichtende zylindrische Fläche 20 während in dem in der Gefässwandung 14 liegenden Bereich ein Spiel 22 zwischen Rotor 16 und Stator 15 gebildet ist, das vorzugsweise mindestens einige Zehntelmillimeter beträgt und so aufgelegt ist, dass die Einheit bei den sehr unterschiedlichen Wärmeausdehnungen beim Abgiessen nicht klemmt, aber trotzdem eine Führung des Rotors auch im unteren Teil des Stators gegeben ist.According to the invention, between the stator 15 and the rotor 16 which can be driven from the vessel bottom 11 'in the region lying within the melt, a openings 20 and 17 surrounding the sealing cylindrical surface 20 while in the region lying in the vessel wall 14 there is a play 22 between the rotor 16 and Stator 15 is formed, which is preferably at least a few tenths of a millimeter and is placed so that the unit does not jam with the very different thermal expansions during casting, but there is still guidance of the rotor in the lower part of the stator.

Fig.2 zeigt eine Variante einer feuerfesten Stator/Rotor-Einheit ähnlich der nach Fig.1, bei der jedoch nur eine querliegende Oeffnung 31 und eine mit dieser verbundene Ausgussöffnung 31′ im Rotor 33 vorgesehen ist und der Stator 32 hutförmig ausgebildet ist. Wiederum ist zwischen letzterem und dem Rotor 33 eine abdichtende zylindrische Fläche 30 innerhalb des in der Schmelze befindlichen Bereiches vorgesehen. Innerhalb der Gefässwandung 14 ist der Stator-Innendurchmesser zur Erzielung des genannten Spieles 34 aufgeweitet. Am unteren Ende der Stator-Bohrung ist ein Ringspalt 35 mit einer Anschlussleitung 36 ausgebildet, in die Inertgas, bspw. Argon, zum Verhindern von Luftansaugen eingeblasen wird. Die querliegende Oeffnung 31 ist schräg nach unten in die Ausgussöffnung 31′ geführt, könnte aber auch vertikal zu letzterer angeordnet sein.Fig.2 shows a variant of a refractory stator / rotor unit similar to that of Figure 1, but in which only a transverse opening 31 and a spout 31 'connected thereto in the Rotor 33 is provided and the stator 32 is hat-shaped. Again, a sealing cylindrical surface 30 is provided between the latter and the rotor 33 within the area in the melt. The inside diameter of the stator is widened within the vessel wall 14 in order to achieve the aforementioned play 34. At the lower end of the stator bore, an annular gap 35 is formed with a connecting line 36 into which inert gas, for example argon, is blown in to prevent air intake. The transverse opening 31 is guided obliquely down into the pouring opening 31 ', but could also be arranged vertically to the latter.

Eine Einheit nach Fig.3 und Fig.4 besteht wiederum aus einem als feuerfeste Hülse ausgebildeten, in der Gefässwandung 14 eingebetteten Stator 42 und einem in diesem drehbar geführten feuerfesten Rotor 43. Eine querliegende Oeffnung 41 und eine von dieser ausgehende Ausgussöffnung 41′ im Rotor 43 ermöglichen das Abgiessen von Schmelze aus dem Behälter 11. Als weiter Ausbildung der Erfindung hat der Stator 42 in seiner Bohrung eine Ringnut 44 und in diese führende radiale Oeffnungen 44′, die zwischen die querliegende Oeffnung 41 und die Innenwandung 14′ des Gefässes 11 zu liegen kommen. Die abdichtende zylindrische Fläche 40 zwischen Stator 42 und Rotor 43 umgibt die Oeffnung 41 und auch diese Ringnut 44, damit ein Auslaufen der in dieser Ringnut 44 befindlichen Schmelze verhindert ist. Zwischen Stator 42 und Rotor 43 ist wiederum in dem in der Gefässwandung 14 liegenden Bereich ein Spiel 46 vorgesehen, das durch Verjüngung des Rotor-Aussendurchmessers erreicht ist.A unit according to Fig.3 and Fig.4 in turn consists of a refractory sleeve designed in the vessel wall 14 stator 42 and a rotatably guided refractory rotor 43. A transverse opening 41 and a pouring opening 41 'emanating therefrom in the rotor 43 allow the pouring of melt from the container 11. As a further development of the invention, the stator 42 has an annular groove 44 in its bore and leading radial openings 44 'into this, which between the transverse opening 41 and the inner wall 14' of the vessel 11 come to lie. The sealing cylindrical surface 40 between the stator 42 and the rotor 43 surrounds the opening 41 and also this annular groove 44, so that the melt located in this annular groove 44 is prevented from escaping. Between the stator 42 and the rotor 43, a play 46 is again provided in the area lying in the vessel wall 14, which is achieved by tapering the outer diameter of the rotor.

Ein Verschluss 50 gemäss Fig.5 hat eine feuerfeste Stator/Rotor-Einheit, bei der ein kegelstumpfförmiger Stator 52 in den Ausguss 13 der Pfanne 11 eingemörtelt ist, in Längsrichtung eine sacklockförmige Oeffnung 54 und eine mit ihr verbundene quere Oeffnung 55 hat und ein Rotor 53 im Bereich der querliegenden Oeffnung 55 in ihm dreh-und/oder längsverschiebbar angeordnet ist. Eine mit dem Rotor 53 drehverbundene Antriebwelle 53′ ragt durch den Stator 52 und ist mit einem nicht dargestellten Antrieb unterhalb des Gefässbodens 11 gekoppelt.A closure 50 according to FIG. 5 has a refractory stator / rotor unit, in which a frustoconical stator 52 is mortared into the spout 13 of the pan 11, has a sacklock-shaped opening 54 and a transverse opening 55 connected to it in the longitudinal direction, and a rotor 53 in the area of transverse opening 55 is rotatably and / or longitudinally displaceable in it. A rotatably connected to the rotor 53 drive shaft 53 'protrudes through the stator 52 and is coupled to a drive, not shown, below the vessel bottom 11.

Zwischen Rotor 53 und Stator 52 ist eine abdichtende zylindrische Fläche 56 vorgesehen, die sich annähernd über den gesamten Bereich der in der Schmelze liegenden Einheit erstreckt. Zwischen der Antriebswelle 53′ und der sie umgebenden Bohrung im Stator 52 ist ein definiertes Spiel 57 vorgesehen , mit dem ein Verklemmen der Welle 53′ in dieser Bohrung vermieden ist. Der Rotor 53 kann entweder gedreht oder aber in Längsrichtung verschoben werden zwecks Oeffnen bzw. Schliessen des Verschlusses 50. An der Durchflussöffnung 54 des Stators 52 ist ein andeutungsweise dargestelltes Giessrohr 58 angeschlossen, das sich üblicherweise in die Schmelze einer Kokille erstreckt.A sealing cylindrical surface 56 is provided between the rotor 53 and the stator 52, which extends approximately over the entire area of the unit lying in the melt. Between the drive shaft 53 'and the surrounding bore in the stator 52, a defined game 57 is provided, with which jamming of the shaft 53' is avoided in this bore. The rotor 53 can either be rotated or shifted in the longitudinal direction for the purpose of opening or closing the closure 50. A pouring tube 58, indicated in the illustration, is connected to the flow opening 54 of the stator 52 and usually extends into the melt of a mold.

Bei einer Variante nach Fig.6 enthält der Stator 52 zwecks Standzeiterhöhung einen den Rotor 53˝ umgebenden feuerfesten Hochwerteinsatz 52′, der vorzugsweise in den feuerfesten gegossenen Stator 52 eingebettet ist. Die Durchflussöffnung 55 verläuft gegenüber der Variante nach Fig.5 insofern anders als sie, nachdem sie die eine abdichtende Fläche 56′ zwischen Rotor 53˝ und Stator 52 durchquert hat, annähernd in der Mitte des Rotors 53˝ stirnseitig aus ihm herausgeführt ist.In a variant according to FIG. 6, the stator 52 contains a refractory high-value insert 52 ′ surrounding the rotor 53˝ for the purpose of increasing the service life, which is preferably embedded in the refractory cast stator 52. The flow opening 55 runs differently from the variant according to FIG. 5 insofar as it, after having passed through the sealing surface 56 'between the rotor 53˝ and the stator 52, is brought out of it approximately in the middle of the rotor 53˝.

Bei Fig.7 enthält der feuerfeste Stator 52′ unterhalb seiner querliegenden Oeffnung 55 eine den Rotor 53 umgebende Ringnut 60, die über mindestens eine Oeffnung 61 mit dem Innern des Gefässes verbunden ist und von der abdichtenden zylindrischen Fläche 56 zwischen Rotor 53 und Stator 52′ umgeben ist. Dadurch lässt sich - wie bereits erwähnt - vermeiden, dass unerwünscht Luft in die in der Queröffnung 55 befindlichen Schmelze angesaugt wird und dort zu einer Reoxidation des flüssigen Stahles führt.7, the refractory stator 52 'contains below its transverse opening 55 an annular groove 60 surrounding the rotor 53, which is connected to the inside of the vessel via at least one opening 61 and from the sealing cylindrical surface 56 between the rotor 53 and the stator 52' surround is. As already mentioned, this makes it possible to avoid undesired air being sucked into the melt located in the transverse opening 55 and there leading to reoxidation of the liquid steel.

Fig.8 und Fig.9 zeigen je eine Variante des in Fig. 1 dargestellten Verschlusses 10. Der Stator 15′ und der in ihm drehbar geführte Rotor 16′ gemäss Fig.8 haben je eine sich im Betriebszustand gegenseitig berührende, senkrecht zur zylindrischen Fläche 20 verlaufende Ringfläche 75,76. Diese Ringflächen bilden eine zusätzliche Dichtung nebst der zwischen Stator 15′ und Rotor 16′ ohnehin vorgesehenen Dichtfläche 20. Dadurch wird vermieden, dass Metallschmelze in den aufgeweiteten Raum zwischen Stator und Rotor in dem innerhalb der Gefässwandung liegenden Bereich fliesst.8 and 9 each show a variant of the closure 10 shown in FIG. 1. The stator 15 'and the rotor 16' which is rotatably guided in it according to FIG. 8 each have a mutually contacting one another in the operating state and perpendicular to the cylindrical surface 20 running ring surface 75.76. These ring surfaces form an additional seal in addition to the sealing surface 20 provided in any case between the stator 15 'and the rotor 16'. This prevents metal melt from flowing into the widened space between the stator and the rotor in the region located within the vessel wall.

Die Stator/Rotor-Einheit 15˝,16˝ nach Fig.9 unterscheidet sich von der nach Fig.8 nur insofern, als die zusätzlich abdichtenden Ringflächen 75′ , 76′ unter einer Schräge, vorzugsweise zwischen 30° und 60° zur zylindrischen Gleitfläche 20 verlaufen und der Rotor 16˝ eine Ringdichtung 77 aufgestülpt hat, die aus einem feuerfesten Material mit guten Gleiteigenschaften, wie z.B. Graphit, besteht. Zu seiner Zentrierung ist diese Ringdichtung 77 an einer Anschlagfläche 78 am Rotor 16˝ positioniert. Die Ringdichtung könnte selbstverständlich auch im Stator 15˝ eingebettet sein. Stator und Rotor 15′,16′ resp. 15˝,16˝ sind vorteilhaft an diesen Ringflächen unter leichtem Anspressdruck (ein paar Kilogramm) gegeneinander gedrückt.The stator / rotor unit 15˝, 16˝ according to Figure 9 differs from that according to Figure 8 only in that the additional sealing ring surfaces 75 ', 76' at an incline, preferably between 30 ° and 60 ° to the cylindrical sliding surface 20 run and the rotor 16˝ has put on an annular seal 77, which is made of a refractory material with good sliding properties, such as Graphite. To center it, this ring seal 77 is positioned on a stop surface 78 on the rotor 16˝. The ring seal could of course also be embedded in the stator 15˝. Stator and rotor 15 ', 16' respectively. 15˝, 16˝ are advantageously pressed against each other on these ring surfaces under a slight contact pressure (a few kilograms).

Die beschriebenen Stator/Rotor-Einheiten sind insbesondere für Gefässe mit Stahlschmelze gedacht, bei denen sie im Gefässboden mit vertikalem Ausguss angeordnet sind. Es wäre aber vorzugsweise bei Gefässen mit Leichtmetallschmelzen denkbar, diese in die Seitenwand mit horizontalem Ausguss einzubauen.The stator / rotor units described are particularly intended for vessels with molten steel, in which they are arranged in the bottom of the vessel with a vertical spout. However, it would preferably be conceivable for vessels with light metal melts to be installed in the side wall with a horizontal spout.

Claims (18)

  1. Refractory stator/rotor unit for a valve at the outlet of a vessel (11) containing a metal melt which comprises a stator (15, 52) secured in the vessel wall and a rotor (16, 53), which is rotatable and/or longitudinally slidable in it and serves to open or close the valve, the unit extending into the vessel and having at least one transverse outlet opening and an outlet opening starting from it leading out of the vessel, characterised in that the rotor (16, 53), which is guided in the stator (15, 52), may be actuated from the vessel base (11') and that provided between the rotor (16, 53) and the stator (15, 52) in nearly the entire region extending into the vessel (11) there is a sealing cylindrical surface (20, 56) surrounding the transverse opening(s) (17, 18, 55) whilst provided in the region situated within the vessel wall (14) there is a clearance, which accommodates the differing thermal expansions of the stator and rotor, for preventing jamming of the unit.
  2. Unit as claimed in Claim 1, characterised in that the bore diameter of the stator (15, 52) is broadened in the region within the vessel wall (14) with respect to that in the interior of the vessel and/or the external diameter of the rotor (16) is reduced by at least a few tenths of a millimetre in each case.
  3. Unit as claimed in Claim 1 or 2, characterised in that the rotor (16, 33, 43) is arranged concentrically within the stator (15, 32, 42) and has a centrally extending flow opening (19', 31', 41') and at least one transverse opening (19, 31, 41) connected to it and situated within the vessel.
  4. Unit as claimed in Claim 1 or 2, characterised in that the stator (52) has a transverse outlet opening (55) and an outlet opening (54) connected to it and leading out of the vessel (11), the rotor (53) is rotatably and/or longitudinally slidably arranged in the region of the transverse opening (55) within a bore in the stator (52) and has a transverse flow opening (55) passing through it or a flow opening (55') bent into the interior of the vessel.
  5. Unit as claimed in one of the preceding claims, characterised in that a gas supply (35, 36, 71, 72) of inert gas, for example argon, is provided between the rotor (33, 53') and the stator (32, 52) in the region situated within the vessel wall.
  6. Unit as claimed in one of the preceding claims, characterised in that the transverse flow opening (17, 18, 31, 41, 55) within the stator (15, 32, 42, 52) has a defined spacing from the vessel inner wall (14'), preferably at least 20 millimetres.
  7. Unit as claimed in one of the preceding claims, characterised in that it is preferably used with a vertical axis in the vessel base.
  8. Unit as claimed in one of the preceding claims, characterised in that the rotor (16', 16'') and the stator (15', 15'') have at least one respective, mutually contacting, oblique annular surface (75, 76, 75', 76') serving as a seal on their cylindrical sealing surfaces.
  9. Unit as claimed in Claim 8, characterised in that the annular surfaces (75, 76, 75', 76') are arranged at the lower end of the sealing cylindrical surface (20) provided between the rotor (16', 16'') and stator (15', 15'').
  10. Unit as claimed in Claim 8 or 9, characterised in that the annular surface (75, 76) of the stator (15') or rotor (16') extends approximately at right angles to the cylindrical surface (20).
  11. Unit as claimed in Claim 8 or 9, characterised in that at least one annular surface (76') is formed by an annular seal (77) which comprises, in particular, graphite or a similar material with good sliding properties.
  12. Stator for a unit as claimed in Claim 1, characterised in that it has a cylindrical blind or through bore (20).
  13. Stator as claimed in Claim 12, characterised in that its bore (14) is broadened or constricted in the region situated in the vessel wall.
  14. Stator as claimed in one of Claims 4, 12 or 13, characterised in that it has a transverse outlet opening (55) and an outlet opening (54) connected to it leading out of the vessel (11) and a through bore provided for the rotor (53) extending in the axial direction.
  15. Stator as claimed in Claim 14, characterized in that it comprises cast refractory material and includes a high grade refractory sleeve insert (52') for the rotor (53'') in the region of the bore.
  16. Stator as claimed in one of the preceding claims, characterized in that it is provided with at least one annular groove (44, 60) in the bore containing the rotor (43, 53), leading into which there is preferably a plurality of radial openings (44', 61) starting from the interior of the vessel (11), the annular groove (44, 60) is arranged below the transverse flow opening (41, 55) and is surrounded by the sealing cylindrical surface (40, 56).
  17. Rotor for a unit as claimed in Claim 1, characterised in that it has a cylindrical outer surface.
  18. Rotor as claimed in Claim 17, characterised in that its cylindrical outer surface is of reduced size or broadened in the region situated within the vessel wall (14).
EP89115072A 1988-09-29 1989-08-16 Refractory stator-rotor unit for a nozzle gate in a vessel holding molten metal Expired - Lifetime EP0361052B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89115072T ATE97041T1 (en) 1988-09-29 1989-08-16 REFRACTORY STATOR/ROTOR ASSEMBLY FOR A CLOSURE AT THE NOZZLE OF A METAL CONTAINING VESSEL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3629/88 1988-09-29
CH3629/88A CH676811A5 (en) 1988-09-29 1988-09-29

Publications (3)

Publication Number Publication Date
EP0361052A2 EP0361052A2 (en) 1990-04-04
EP0361052A3 EP0361052A3 (en) 1991-08-14
EP0361052B1 true EP0361052B1 (en) 1993-11-10

Family

ID=4260085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89115072A Expired - Lifetime EP0361052B1 (en) 1988-09-29 1989-08-16 Refractory stator-rotor unit for a nozzle gate in a vessel holding molten metal

Country Status (14)

Country Link
US (1) US5078306A (en)
EP (1) EP0361052B1 (en)
JP (1) JPH02117767A (en)
KR (1) KR970005374B1 (en)
CN (1) CN1026563C (en)
AT (1) ATE97041T1 (en)
BR (2) BR8904884A (en)
CA (1) CA1340564C (en)
CH (1) CH676811A5 (en)
DE (2) DE3926249A1 (en)
ES (1) ES2048247T3 (en)
FI (1) FI87427C (en)
IL (1) IL91060A (en)
ZA (1) ZA895689B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226263B (en) * 1988-12-22 1992-11-04 Steel Castings Res Valve for vessel outlet
AU651946B2 (en) * 1989-06-01 1994-08-11 Shinagawa Refractories Co., Ltd. Apparatus for controlling flow rate of molten metal
CH681435A5 (en) * 1989-07-11 1993-03-31 Stopinc Ag
DE3934601C1 (en) * 1989-10-17 1990-10-04 Didier-Werke Ag, 6200 Wiesbaden, De
US5230813A (en) * 1989-11-28 1993-07-27 Didier-Werke Ag Stator and rotor members for use in apparatus for closing and/or regulating the discharge or tapping of molten metal
US5330162A (en) * 1992-07-29 1994-07-19 Meichuseiki Kabushiki Kaisha Dipping and pouring apparatus for molten metal
DE19500012A1 (en) * 1995-01-02 1996-07-04 Didier Werke Ag Control and closure device for a metallurgical vessel
US7543605B1 (en) * 2008-06-03 2009-06-09 Morando Jorge A Dual recycling/transfer furnace flow management valve for low melting temperature metals
CN106311981B (en) * 2016-11-17 2018-03-02 遵义市润丰源钢铁铸造有限公司 The apparatus for pouring of lost foam casting casting

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Publication number Priority date Publication date Assignee Title
GB183241A (en) * 1921-04-19 1922-07-19 William Rowlands Improvements in or relating to teeming devices for ladles adapted to hold molten steel
US1742065A (en) * 1928-05-26 1929-12-31 George H J Eiser Ladle discharger
US3344965A (en) * 1965-10-18 1967-10-03 Joseph J Kerin Pouring nozzle for molten steel ladle
US3651998A (en) * 1970-09-23 1972-03-28 Metallurg Exoproducts Corp Nozzle for a pouring ladle
AT357283B (en) * 1977-09-16 1980-06-25 Voest Alpine Ag TURNOVER LOCK FOR FIRE-PROOF LINING
JPS59157756U (en) * 1983-04-04 1984-10-23 住友金属工業株式会社 tandateshiyu
DE3540202C1 (en) * 1985-11-13 1986-11-27 Brown, Boveri & Cie Ag, 6800 Mannheim Inflow regulating element for mould level control in a continuous casting plant
JPS62202948U (en) * 1986-06-11 1987-12-24
JPH01143757A (en) * 1986-12-20 1989-06-06 Didier Werke Ag Rotary sliding closing device for metallurgical vessel and body of revolution for such rotary sliding closing device
JPS63256265A (en) * 1987-04-13 1988-10-24 Nkk Corp Nozzle interpolation type rotary nozzle
US4779876A (en) * 1987-05-11 1988-10-25 John Crane-Houdaille. Inc. Drive for banded washer type seal
EP0302215B1 (en) * 1987-08-03 1992-12-30 Didier-Werke Ag Rotary valve for a metallurgical vessel, and rotor and stator therefor
DE3731600A1 (en) * 1987-09-19 1989-04-06 Didier Werke Ag TURNTABLE CLOSURE FOR A METALURIGAN TUBE AND ROTOR AND / OR STATOR FOR SUCH A TURNOVER
GB8723059D0 (en) * 1987-10-01 1987-11-04 Foseco Int Rotary pouring nozzle

Also Published As

Publication number Publication date
EP0361052A3 (en) 1991-08-14
IL91060A (en) 1993-08-18
ZA895689B (en) 1990-04-25
CH676811A5 (en) 1991-03-15
DE3926249A1 (en) 1990-04-05
FI894405A (en) 1990-03-30
DE58906160D1 (en) 1993-12-16
CA1340564C (en) 1999-05-25
IL91060A0 (en) 1990-02-09
CN1026563C (en) 1994-11-16
JPH0339785B2 (en) 1991-06-14
ES2048247T3 (en) 1994-03-16
FI87427B (en) 1992-09-30
US5078306A (en) 1992-01-07
EP0361052A2 (en) 1990-04-04
BR8904884A (en) 1990-05-08
FI894405A0 (en) 1989-09-18
JPH02117767A (en) 1990-05-02
KR900004433A (en) 1990-04-12
BR8904883A (en) 1990-05-08
KR970005374B1 (en) 1997-04-15
CN1041553A (en) 1990-04-25
FI87427C (en) 1993-01-11
ATE97041T1 (en) 1993-11-15

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