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EP0340726A1 - Electrode supporting arm for an electric arc furnace - Google Patents

Electrode supporting arm for an electric arc furnace Download PDF

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Publication number
EP0340726A1
EP0340726A1 EP89107936A EP89107936A EP0340726A1 EP 0340726 A1 EP0340726 A1 EP 0340726A1 EP 89107936 A EP89107936 A EP 89107936A EP 89107936 A EP89107936 A EP 89107936A EP 0340726 A1 EP0340726 A1 EP 0340726A1
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EP
European Patent Office
Prior art keywords
electrode
arm
clamping device
flange connection
support arm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89107936A
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German (de)
French (fr)
Other versions
EP0340726B1 (en
Inventor
Uwe Kark
Karl-Heinz Dr. Klein
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Badische Stahl Engineering GmbH
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Badische Stahl Engineering 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 Badische Stahl Engineering GmbH filed Critical Badische Stahl Engineering GmbH
Priority to AT89107936T priority Critical patent/ATE65871T1/en
Publication of EP0340726A1 publication Critical patent/EP0340726A1/en
Application granted granted Critical
Publication of EP0340726B1 publication Critical patent/EP0340726B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/103—Mountings, supports or terminals with jaws

Definitions

  • the electrodes of arc furnaces for steel production are held by support arms, which at the end have an electrode tensioning device and are in turn held on support columns, which allow height adjustment. Cooling water guiding devices are provided for cooling the electrode holder and the arm itself.
  • the support arms usually used in practice have separate high-current lines provided on the support arms. Since these involve considerable manufacturing and maintenance expenditure, it has also been proposed to use the entire support arm to produce from copper and to conduct current (US-A 2,494,775).
  • the support arm is hollow and closed at the front end by a flange plate, which is used for flange connection to the electrode clamping device. Part of the power supply to the tensioning device is also routed via the flange connection.
  • the coolant is fed to the tensioning device from the coolant cavity provided within the support arm via external pipes past the flange connection. It has not become known that such an electrode support arm has proven itself in practice; at least for larger furnaces, the unfavorable relationship between strength and weight of copper as a support arm material seems quite unfavorable.
  • the support arm which is made of aluminum and which is current-carrying in its entirety, is therefore not connected to the electrode clamping device via a flange connection, but rather the end plate which delimits the support arm at the end welded to the profile parts forming the clamping device.
  • This avoids the problematic contact current transition in the area of a flange connection.
  • it is disadvantageous that the tensioning device cannot be released from the support arm. In the known case, this may be acceptable because the power and thus also the heat development and the need for maintenance are low.
  • the invention has for its object to provide an electrode support arm according to the preamble of claim 1, which is less expensive than a copper or aluminum plated steel arm and allows a releasable, current-carrying flange connection between the arm part and the electrode clamping device.
  • the design of the arm made of light metal makes it possible to dispense with a steel core despite sufficient stability.
  • the problems which arise in the current-carrying flange area due to the tendency of the light metal to oxidize, in particular at higher temperatures and its susceptibility to burning if there is insufficient contact, are avoided according to the invention in that the flange connection is particularly intensively cooled by the immediate vicinity of the coolant cavity and by means of the cooling water-carrying through openings. Local overheating can therefore not occur to a dangerous degree.
  • the cooling water through openings additionally simplify the construction because external connecting pipes are avoided.
  • the flange connection is expediently formed by a flange plate not only on the side of the arm part, but also on the side of the electrode clamping device consists of light metal and is involved in the formation of the coolant cavity of the corresponding part of the electrode clamping device. This results in symmetrical conditions on both sides of the flange connection and the risk is reduced that the components involved in the flange connection warp under changing temperature influence and those surface portions of the flange surfaces which are effectively in contact with one another could change.
  • actuating members For the electrode clamp formed by the electrode clamping device, actuating members must be provided, which generally consist of a pull rod, a spring assembly and a hydraulic relief device. According to the invention, these are accommodated between the flange connection and the electrode clamp in a further arm section belonging to the electrode clamping device. This has the advantage that the actuators can also be exchanged by changing the electrode clamping device.
  • through openings can be provided in the flange connection in accordance with the cooling requirements of the flange connection.
  • the cooling effect is further increased by the fact that through openings are also provided in the flange connection for the cooling water supply of the clamping bracket, which can also consist of pipes or hose lines that are partly laid outside the arm or, according to an expedient alternative embodiment of the invention, through a clamping bracket pull rod , which belongs to the actuators of the electrode clamp.
  • the support arm 4 comprises a rear arm part 10 and the electrode clamping device 6, which consists of an arm-fixed part 7 and a clamping bracket 8.
  • the electrode clamping device can be separated from the arm part 10 behind it by means of the flange connection 9.
  • the support arm 4, at least its part 10 and preferably also its part 7, is made of aluminum and as such is designed to carry current.
  • the arm part 10 is designed as an internally ribbed hollow body which is filled with cooling water and forms two cooling water paths for the purpose of circulation. It ends at the front in a flange plate 11, with which the corresponding flange plate 12 of the electrode holder 6 is screwed to form the flange connection 9.
  • the contact surface of these flange plates is designed as a current transfer surface.
  • the flange plates 11, 12 are part of the arm part 10 or the arm-fixed part 7 and, like this, therefore consist of aluminum or aluminum alloy.
  • the arm-fixed part of the electrode clamping device consists of the elongated arm portion 13, which continues the arm part 10, and a forked part 14, which has contact jaws 15, which hold the electrode and Form a low-resistance current transfer on this.
  • the clamping bracket of the electrode holder is closed in a ring shape with a pressure jaw 16 and is pulled backwards by a pull rod 17 under the action of a spring plate package 18 in order to generate the holding voltage.
  • the hydraulic piston-cylinder arrangement 19 the spring assembly can be compressed and the clamping bracket can be pushed forward for the electrode change.
  • the arm-fixed part 7 and the clamping bracket 8 of the electrode holder 6 are hollow in a known manner for receiving cooling water.
  • the tensioning bracket 8 can be made in a conventional manner, for example from alloy steel.
  • the cooling water cavities 20 of the arm-fixed part 7 of the electrode clamping device are connected to the cooling water cavities 29 of the arm part 10 via cooling water through openings, one of which is illustrated at 21 in FIG. 2, so that there is a closed path for the cooling water circulation through these parts.
  • the arrangement of the cooling water passage openings 21 in the flange plates 11, 12 simplifies the replacement of the electrode clamping device and cools the flange plates.
  • the hydraulic lines 22 belonging to the piston-cylinder device 19 run outside the flange connection.
  • one Transition chamber 25 may be provided, which is divided into a supply and discharge part and connected in a manner not shown to cooling water supply and discharge pipes. The walls of the chamber 25 are sealed to the surface of the pull rod 17.
  • the pull rod 17 contains two longitudinal channels, which open as a supply or discharge opening in the chamber 25 and which are connected at the front end of the pull rod 17 to the cooling water cavities 26 of the clamping bracket 8, so that the indicated by dash-dotted arrows in Fig. 2 Flow course can result.
  • the contact jaws 15 are connected in one piece to the electrode holder, i. H. are firmly welded to it or are parts of the electrode-side walls of the forks 14. Since these walls are well cooled on the outer surface thanks to the recessed cooling water channels and thanks to the high thermal conductivity of aluminum, this can result in a significant simplification compared to conventional, detachable contact jaws. But even if in the context of the invention the contact jaws are designed as separate, detachable parts, a simplification occurs in that insulation between them and the fork parts 14 is not necessary.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

PCT No. PCT/EP89/00480 Sec. 371 Date Sep. 7, 1990 Sec. 102(e) Date Sep. 7, 1990 PCT Filed May 2, 1989 PCT Pub. No. WO89/11203 PCT Pub. Date Nov. 16, 1989.An electrode carrier arm for an electric arc furnace consists of an arm part (10) and of a electrode-clamping device and is produced so as to be current carrying from a material of high conductivity. Between the arm part and the electrode-clamping device there is a flanged connection consisting of flanged plates (11, 12) which limit a cooling-liquid cavity (20, 29) on both sides and which themselves contain passage orifices (21) for the cooling liquid from one cooling-liquid cavity to the other. This allows an effective cooling of the flanged plates and consequently a direct supply of current via the flanged connection when the carrier arm is produced from light metal.

Description

Die Elektroden von Lichtbogenöfen für die Stahlerzeugung werden von Tragarmen gehalten, die am Ende eine Elektroden­spanneinrichtung aufweisen und ihrerseits an Tragsäulen gehalten sind, die eine Höhenverstellung ermöglichen. Für die Kühlung der Elektrodenfassung und des Arms selbst sind Kühlwasser-Leiteinrichtungen vorgesehen. Für die Stromzu­führungen zu den Elektroden weisen die in der Praxis meist verwendeten Tragarme gesondert an den Tragarmen vorgesehene Hochstromleitungen auf. Da diese einen beträchtlichen herstellungs- und wartungstechnischen Aufwand mit sich bringen, hat man auch vorgeschlagen, den gesamten Tragarm aus Kupfer herzustellen und stromführend zu gestalten (US-A 2,494,775). Der Tragarm ist hohl ausgeführt und am vorderen Ende durch eine Flanschplatte abgeschlossen, die zur Flanschverbindung mit der Elektrodenspanneinrichtung dient. Auch ein Teil der Stromführung zur Spanneinrichtung wird ber die Flanschverbindung geleitet. Die Kühlflüssigkeit wird der Spanneinrichtung von dem innerhalb des Tragarms vorgesehenen Kühlflüssigkeitshohlraum über außenliegende Rohre an der Flanschverbindung vorbei zugeführt. Es ist nicht bekannt geworden, daß ein solcher Elektrodentragarm sich in der Praxis bewährt hätte; zumindest für größere Öfen scheint das ungünstige Verhältnis von Festigkeit und Gewicht von Kupfer als Tragarmmaterial recht ungünstig.The electrodes of arc furnaces for steel production are held by support arms, which at the end have an electrode tensioning device and are in turn held on support columns, which allow height adjustment. Cooling water guiding devices are provided for cooling the electrode holder and the arm itself. For the current supply to the electrodes, the support arms usually used in practice have separate high-current lines provided on the support arms. Since these involve considerable manufacturing and maintenance expenditure, it has also been proposed to use the entire support arm to produce from copper and to conduct current (US-A 2,494,775). The support arm is hollow and closed at the front end by a flange plate, which is used for flange connection to the electrode clamping device. Part of the power supply to the tensioning device is also routed via the flange connection. The coolant is fed to the tensioning device from the coolant cavity provided within the support arm via external pipes past the flange connection. It has not become known that such an electrode support arm has proven itself in practice; at least for larger furnaces, the unfavorable relationship between strength and weight of copper as a support arm material seems quite unfavorable.

Diesem Mangel hilft eine andere bekannte Konstruktion ab EP-A 0184140), bei der der aus Stahl bestehende Tragarm außenseitig mit Kupfer oder Aluminium plattiert ist. Dies ist sehr aufwendig. Am Ende wird der Arm einschließlich seines Kühlflüssigkeitshohlraums von einer Flanschplatte begrenzt, die zur Flanschverbindung mit einer Kontaktbacke der Spanneinrichtung dient, wobei auch die Stromführung über diese Flanschverbindung stattfinden soll. In der Praxis wird diese Konstruktion jedoch mit einer die Flanschverbindung umgehenden, gesonderten Stromverbindung von der Kupferplattierung des Tragarms zu der Kontaktbacke ausgeführt, woraus zu schließen ist, daß die Stromführung über die Flanschverbindung selbst bei der Verwendung von Kupfer problematisch ist; ein absolut gleichmäßiger, großflächiger Übergangskontakt in der Flanschverbindung kann nämlich nicht garantiert werden, so daß örtlich Überhitzungen auftreten können, die rasch zur Zerstörung führen.This deficiency is helped by another known construction from EP-A 0184140), in which the support arm made of steel is clad on the outside with copper or aluminum. This is very time-consuming. At the end, the arm, including its coolant cavity, is delimited by a flange plate, which is used for flange connection to a contact jaw of the tensioning device, and current is also to be carried out via this flange connection. In practice, however, this construction is carried out with a separate power connection bypassing the flange connection from the copper plating of the support arm to the contact jaw, from which it can be concluded that the current supply via the flange connection is problematic even when using copper; an absolutely even, large-area transition contact in the flange connection cannot be guaranteed, so that local overheating can occur, which can quickly lead to destruction.

Bei wieder einem anderen bekannten Elektrodentragarm (FR-A 1336823) ist deshalb der in seiner Gesamtheit stromführend aus Aluminium hergestellte Tragarm nicht über eine Flansch­verbindung mit der Elektrodenspanneinrichtung verbunden, sondern die den Tragarm am Ende begrenzende Stirnplatte ist mit den die Spanneinrichtung bildenden Profilteilen ver­schweißt. Dadurch wird der problematische Berührungsstrom­übergang im Bereich einer Flanschverbindung vermieden. Nachteilig ist jedoch, daß die Spanneinrichtung nicht vom Tragarm gelöst werden kann. Dies mag in dem bekannten Fall deshalb akzeptabel sein, weil die Leistung und damit auch die Wärmeentwicklung und die Wartungsbedürftigkeit gering sind.In yet another known electrode support arm (FR-A 1336823), the support arm, which is made of aluminum and which is current-carrying in its entirety, is therefore not connected to the electrode clamping device via a flange connection, but rather the end plate which delimits the support arm at the end welded to the profile parts forming the clamping device. This avoids the problematic contact current transition in the area of a flange connection. However, it is disadvantageous that the tensioning device cannot be released from the support arm. In the known case, this may be acceptable because the power and thus also the heat development and the need for maintenance are low.

Der Erfindung liegt die Aufgabe zugrunde, einen Elektroden­tragarm gemäß Oberbegriff des Anspruchs 1 zu schaffen, der weniger aufwendig als ein mit Kupfer oder Alumium plat­tierter Stahlarm ist und eine lösbare, stromführende Flanschverbindung zwischen dem Armteil und der Elektroden­spanneinrichtung gestattet.The invention has for its object to provide an electrode support arm according to the preamble of claim 1, which is less expensive than a copper or aluminum plated steel arm and allows a releasable, current-carrying flange connection between the arm part and the electrode clamping device.

Die erfindungsgemäße Lösung besteht in den kennzeichnenden Merkmalen des Anspruchs 1.The solution according to the invention consists in the characterizing features of claim 1.

Die Ausführung des Arms aus Leichtmetall gestattet es, trotz hinreichender Stabilität auf einen Stahlkern zu verzichten. Die Probleme, die im stromführenden Flanschbereich durch die Oxidationsneigung des Leichtmetalls insbesondere bei höherer Temperatur und seiner Abbranntanfälligkeit bei unzurei­chendem Berührungskontakt herrühren, werden erfindungsgemäß dadurch vermieden, daß die Flanschverbindung durch die unmittelbare Nachbarschaft mit dem Kühlmittelhohlraum und mittels der kühlwasserführenden Durchgangsöffnungen beson­ders intensiv gekühlt ist. Örtliche Überhitzungen können deshalb nicht in gefährlichem Maße auftreten. Außerdem bewirken die Kühlwasserdurchgangsöffnungen zusätzlich eine Bauvereinfachung, weil außen liegende Verbindungsrohre vermieden werden.The design of the arm made of light metal makes it possible to dispense with a steel core despite sufficient stability. The problems which arise in the current-carrying flange area due to the tendency of the light metal to oxidize, in particular at higher temperatures and its susceptibility to burning if there is insufficient contact, are avoided according to the invention in that the flange connection is particularly intensively cooled by the immediate vicinity of the coolant cavity and by means of the cooling water-carrying through openings. Local overheating can therefore not occur to a dangerous degree. In addition, the cooling water through openings additionally simplify the construction because external connecting pipes are avoided.

Zweckmäßigerweise wird nicht nur auf der Seite des Armteils, sondern auch auf der Seite der Elektrodenspanneinrichtung die Flanschverbindung von einer Flanschplatte gebildet, die aus Leichtmetall besteht und an der Bildung des Kühlflüs­sigkeitshohlraums des entsprechenden Teils der Elektroden­spanneinrichtung beteiligt ist. Dadurch ergeben sich nämlich auf beiden Seiten der Flanschverbindung symmetrische Ver­hältnisse und es wird die Gefahr vermindert, daß die an der Flanschverbindung beteiligten Komponenten sich unter wech­selndem Temperatureinfluß verziehen und diejenigen Flächen­anteile der Flanschflächen, die effektiv stromführend Kontakt zueinander aufweisen, sich verändern könnten.The flange connection is expediently formed by a flange plate not only on the side of the arm part, but also on the side of the electrode clamping device consists of light metal and is involved in the formation of the coolant cavity of the corresponding part of the electrode clamping device. This results in symmetrical conditions on both sides of the flange connection and the risk is reduced that the components involved in the flange connection warp under changing temperature influence and those surface portions of the flange surfaces which are effectively in contact with one another could change.

Für die von der Elektrodenspanneinrichtung gebildete Elek­trodenklemme müssen Betätigungsorgane vorgesehen werden, die im allgemeinen aus einer Zugstange, einem Federpaket und einer hydraulischen Entlastungseinrichtung bestehen. Erfin­dungsgemäß werden diese zwischen der Flanschverbindung und der Elektrodenklemme in einem weiteren, zur Elektroden­spanneinrichtung gehörigen Armabschnitt untergebracht. Dies hat den Vorteil, daß durch Wechsel der Elektroden­spanneinrichtung auch die Betätigungsorgane ausgetauscht werden können.For the electrode clamp formed by the electrode clamping device, actuating members must be provided, which generally consist of a pull rod, a spring assembly and a hydraulic relief device. According to the invention, these are accommodated between the flange connection and the electrode clamp in a further arm section belonging to the electrode clamping device. This has the advantage that the actuators can also be exchanged by changing the electrode clamping device.

Für den Kühlwasserkreislauf des Arms können mehrere Durch­gangsöffnungen in der Flanschverbindung entsprechend dem Kühlungsbedarf der Flanschverbindung vorgesehen sein. Der Kühleffekt wird weiter dadurch gesteigert, daß in der Flanschverbindung auch Durchgangsöffnungen für die Kühlwassserversorgung des Spannbügels vorgesehen sind, die im übrigen aus Rohr- oder Schlauchleitungen bestehen kann, die teilweise außerhalb des Arms verlegt sind oder nach einer zweckmäßigen Ausführungsalternative der Erfindung durch eine Spannbügelzugstange verläuft, die zu den Betäti­gungsorganen der Elektrodenklemme gehört.For the cooling water circuit of the arm, several through openings can be provided in the flange connection in accordance with the cooling requirements of the flange connection. The cooling effect is further increased by the fact that through openings are also provided in the flange connection for the cooling water supply of the clamping bracket, which can also consist of pipes or hose lines that are partly laid outside the arm or, according to an expedient alternative embodiment of the invention, through a clamping bracket pull rod , which belongs to the actuators of the electrode clamp.

Die Erfindung wird im folgenden näher unter Bezugnahme auf die Zeichnung erläutert, die ein vorteilhaftes Ausfüh­rungsbeispiel veranschaulicht. Es zeigen:

  • Fig. 1 eine Seitenansicht der Anlage,
  • Fig. 2 einen vertikalen Längsschnitt durch den vorderen Teil des Tragarms und
  • Fig. 3 eine Draufsicht auf den vorderen Teil des Tragarms.
The invention is explained in more detail below with reference to the drawing, which illustrates an advantageous embodiment. Show it:
  • 1 is a side view of the system,
  • Fig. 2 is a vertical longitudinal section through the front part of the support arm and
  • Fig. 3 is a plan view of the front part of the bracket.

In Fig. 1 erkennt man die bekannte Anordnung eines Elektro­ofens 1, von dessen drei Elektroden eine Elektrode 2 darge­stellt ist. Für jede Elektrode ist eine Halteanordnung vorhanden, die aus einer vertikal verstellbaren Tragsäule 3, einem darauf befestigten Tragarm 4 und einer Zuleitungsan­ordnung 5 für Strom und Kühlwasser besteht. Der Tragarm 4 umfaßt einen hinteren Armteil 10 und die Elektrodenspann­einrichtung 6, die aus einem armfesten Teil 7 und einem Spannbügel 8 besteht. Im Zusammenhang der Erfindung ist die Elektrodenspanneinrichtung von dem dahinter liegenden Armteil 10 mittels der Flanschverbindung 9 trennbar.1 shows the known arrangement of an electric furnace 1, of whose three electrodes an electrode 2 is shown. For each electrode there is a holding arrangement which consists of a vertically adjustable support column 3, a support arm 4 fastened thereon and a supply arrangement 5 for electricity and cooling water. The support arm 4 comprises a rear arm part 10 and the electrode clamping device 6, which consists of an arm-fixed part 7 and a clamping bracket 8. In the context of the invention, the electrode clamping device can be separated from the arm part 10 behind it by means of the flange connection 9.

Gemäß der Erfindung besteht der Tragarm 4, zumindest dessen Teil 10 und vorzugsweise auch dessen Teil 7 aus Aluminium und ist er als solcher stromführend ausgebildet.According to the invention, the support arm 4, at least its part 10 and preferably also its part 7, is made of aluminum and as such is designed to carry current.

Der Armteil 10 ist als innen verrippter Hohlkörper ausge­führt, der mit Kühlwasser gefüllt ist und zwecks Zirkulation zwei Kühlwasserwege bildet. Er endet vorne in einer Flanschplatte 11, mit der die entsprechende Flanschplatte 12 der Elektrodenfassung 6 zur Bildung der Flanschverbindung 9 verschraubt ist. Die Kontaktfläche dieser Flanschplatten ist als Stromübergangsfläche ausgebildet. Die Flanschplatten 11, 12 sind Teil des Armteils 10 bzw. des armfesten Teils 7 und bestehen daher wie diese aus Aluminium oder Aluminiumlegie­rung.The arm part 10 is designed as an internally ribbed hollow body which is filled with cooling water and forms two cooling water paths for the purpose of circulation. It ends at the front in a flange plate 11, with which the corresponding flange plate 12 of the electrode holder 6 is screwed to form the flange connection 9. The contact surface of these flange plates is designed as a current transfer surface. The flange plates 11, 12 are part of the arm part 10 or the arm-fixed part 7 and, like this, therefore consist of aluminum or aluminum alloy.

Der armfeste Teil der Elektrodenspanneinrichtung besteht aus dem langgestreckten, den Armteil 10 fortsetzenden Armab­schnitt 13 und einem sich gabelnden Teil 14, der Kontakt­backen 15 aufweist, die zum Halten der Elektrode und zur Bildung eines widerstandsarmen Stromübergangs an dieser anliegen. Der Spannbügel der Elektrodenfassung ist ringför­mig geschlossen mit einer Druckbacke 16 ausgeführt und wird zur Erzeugung der Haltespannung von einer Zugstange 17 unter Wirkung eines Federplattenpakets 18 nach hinten gezogen. Mittels der hydraulischen Kolbenzylinderanordnung 19 kann das Federpaket zusammengedrückt und der Spannbügel für den Elektrodenwechsel nach vorne geschoben werden. Der armfeste Teil 7 und der Spannbügel 8 der Elektrodenfassung 6 sind in bekannter Weise hohl ausgeführt zur Aufnahme von Kühlwasser.The arm-fixed part of the electrode clamping device consists of the elongated arm portion 13, which continues the arm part 10, and a forked part 14, which has contact jaws 15, which hold the electrode and Form a low-resistance current transfer on this. The clamping bracket of the electrode holder is closed in a ring shape with a pressure jaw 16 and is pulled backwards by a pull rod 17 under the action of a spring plate package 18 in order to generate the holding voltage. By means of the hydraulic piston-cylinder arrangement 19, the spring assembly can be compressed and the clamping bracket can be pushed forward for the electrode change. The arm-fixed part 7 and the clamping bracket 8 of the electrode holder 6 are hollow in a known manner for receiving cooling water.

Während die tragenden Teile des armfesten Teils 7 aus Aluminium bestehen und stromführend sind, kann der Spannbü­gel 8 in herkömmlicher Weise, beispielsweise aus legiertem Stahl, hergestellt sein.While the supporting parts of the arm-fixed part 7 consist of aluminum and are live, the tensioning bracket 8 can be made in a conventional manner, for example from alloy steel.

Die Kühlwasserhohlräume 20 des armfesten Teils 7 der Elek­trodenspanneinrichtung stehen über Kühlwasserdurchgangsöff­nungen, von denen eine bei 21 in Fig. 2 veranschaulicht ist, mit den Kühlwasserhohlräumen 29 des Armteils 10 in Verbin­dung, so daß sich für die Kühlwasserzirkulation ein ge­schlossener Weg durch diese Teile ergibt. Die Anordnung der Kühlwasserdurchgangsöffnungen 21 in den Flanschplatten 11, 12 vereinfacht das Auswechseln der Elektrodenspann­einrichtung und kühlt die Flanschplatten. Hingegen verlaufen die zur Kolbenzylindereinrichtung 19 gehörenden Hydrau­likleitungen 22 außerhalb der Flanschverbindung.The cooling water cavities 20 of the arm-fixed part 7 of the electrode clamping device are connected to the cooling water cavities 29 of the arm part 10 via cooling water through openings, one of which is illustrated at 21 in FIG. 2, so that there is a closed path for the cooling water circulation through these parts. The arrangement of the cooling water passage openings 21 in the flange plates 11, 12 simplifies the replacement of the electrode clamping device and cools the flange plates. In contrast, the hydraulic lines 22 belonging to the piston-cylinder device 19 run outside the flange connection.

Für die Kühlwasserversorgung des Spannbügels 8 sind inner­halb des Armteils 10 Rohrleitungen und in den Flanschplatten 11, 12 aneinander anschließende Durchgangsöffnungen vorgesehen, die zu außen liegenden Rohrverbindungen 23 führen, die bekannterweise über Schläuche 24 an den Spann­bügel angeschlossen sind. Diese außen liegenden Rohrverbin­dungen können vermieden werden, indem die Zugstange 17 zur Kühlwasserführung ausgebildet ist. Zu diesem Zweck kann - wie in Fig. 2 strichpunktiert angedeutet ist - eine Übergangskammer 25 vorgesehen sein, die in einen Zu- und Abführungsteil geteilt und in nicht gezeigter Weise an Kühlwasserzu- und -abführungsrohre angeschlossen ist. Die Wände der Kammer 25 sind an die Oberfläche der Zugstange 17 angedichtet. Die Zugstange 17 enthält zwei Längskanäle, die sich als Zu- bzw. Abführungsöffnung in die Kammer 25 öffnen und die am vorderen Ende der Zugstange 17 an die Kühlwas­serhohlräume 26 des Spannbügels 8 angeschlossen sind, so daß sich der durch strichpunktierte Pfeile in Fig. 2 angedeutete Strömungsverlauf ergeben kann.For the cooling water supply of the clamping bracket 8, 10 pipes and in the flange plates 11, 12 adjoining through openings are provided within the arm part, which lead to external pipe connections 23, which are known to be connected via hoses 24 to the clamping bracket. These external pipe connections can be avoided by designing the pull rod 17 for the cooling water. For this purpose - as indicated by dash-dotted lines in FIG. 2 - one Transition chamber 25 may be provided, which is divided into a supply and discharge part and connected in a manner not shown to cooling water supply and discharge pipes. The walls of the chamber 25 are sealed to the surface of the pull rod 17. The pull rod 17 contains two longitudinal channels, which open as a supply or discharge opening in the chamber 25 and which are connected at the front end of the pull rod 17 to the cooling water cavities 26 of the clamping bracket 8, so that the indicated by dash-dotted arrows in Fig. 2 Flow course can result.

In der dargestellten Ausführung ist vorgesehen, daß die Kontaktbacken 15 einstückig mit der Elektrodenfassung verbunden sind, d. h. mit ihr fest verschweißt sind oder Teile der elektrodenseitigen Wände der Gabeln 14 sind. Da diese Wände durch eingelassene Kühlwasserkanäle und dank der hohen Wärmeleitfähigkeit von Aluminium auch an der Außen­fläche gut gekühlt sind, kann sich hierdurch eine wesent­liche Vereinfachung gegenüber herkömmlichen, lösbaren Kontaktbacken ergeben. Aber auch wenn im Zusammenhang der Erfindung die Kontaktbacken als gesonderte, lösbare Teile ausgebildet sind, tritt eine Vereinfachung dadurch ein, daß eine Isolation zwischen ihnen und den Gabelteilen 14 nicht erforderlich ist.In the embodiment shown it is provided that the contact jaws 15 are connected in one piece to the electrode holder, i. H. are firmly welded to it or are parts of the electrode-side walls of the forks 14. Since these walls are well cooled on the outer surface thanks to the recessed cooling water channels and thanks to the high thermal conductivity of aluminum, this can result in a significant simplification compared to conventional, detachable contact jaws. But even if in the context of the invention the contact jaws are designed as separate, detachable parts, a simplification occurs in that insulation between them and the fork parts 14 is not necessary.

Claims (6)

1. Elektrodentragarm für einen elektrischen Lichtbogenofen (1), der einen Armteil (10) und eine Elektrodenspann­einrichtung (6) umfaßt und stromführend aus einem Material hoher Leitfähigkeit ausgebildet ist, wobei zwischen dem Armteil (10) und der Elektrodenspannein­richtung (6) eine stromführende Flanschverbindung (9) vorgesehen ist und der Armteil (10) einen Kühlflüssig­keitshohlraum (29) bildet, der und eine Kühl­flüssigkeitsverbindung zu einem Kühlflüssigkeitshohlraum (20) in einem an die Flanschverbindung grenzenden Teil (7) der Elektrodenspanneinrichtung aufweist, dadurch gekennzeichnet, daß der Armteil (10) aus Leichtmetall besteht, daß die Flanschplatte (11) des Armteils dessen Kühlflüssigkeitshohlraum (29) begrenzt und daß der die Kühlflüssigkeitsverbindung zwischen den Kühlflüssig­keitshohlräumen (20, 29) des Armteils (10) und des an die Flanschverbindung (9) grenzenden Teils (7) der Elektrodenspanneinrichtung von Kühlwasserdurchgangsöff­nungen (21) in der Flanschverbindung (9) gebildet ist.1. Electrode support arm for an electric arc furnace (1), which comprises an arm part (10) and an electrode clamping device (6) and is designed to conduct electricity from a material of high conductivity, with a current-carrying flange connection between the arm part (10) and the electrode clamping device (6) (9) is provided and the arm part (10) forms a coolant cavity (29) which has and a coolant connection to a coolant cavity (20) in a part (7) of the electrode clamping device adjacent to the flange connection, characterized in that the arm part (10 ) made of light metal, that the flange plate (11) of the arm part delimits its coolant cavity (29) and that the coolant connection between the coolant cavities (20, 29) of the arm part (10) and the part (7) adjoining the flange connection (9) the electrode clamping device of cooling water passage openings (21) in the flange connection ( 9) is formed. 2. Elektrodentragarm nach Anspruch 1, dadurch gekennzeich­net, daß auch der an die Flanschverbindung (9) grenzende Teil (7) der Elektrodenspanneinrichtung aus Leichtmetall besteht.2. Electrode support arm according to claim 1, characterized in that the flange (9) bordering part (7) of the electrode clamping device consists of light metal. 3. Elektrodentragarm nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Elektrodenspanneinrichtung eine Elektrodenklemme (8, 14, 15, 16) und einen zwischen der Flanschverbindung (9) und der Elektrodenklemme angeord­neten, Armabschnitt (13) umfaßt, der Betätigungsorgane (17, 18, 19) für die Elektrodenklemme enthält.3. Electrode support arm according to claim 1 or 2, characterized in that the electrode clamping device comprises an electrode clamp (8, 14, 15, 16) and an arm section (13) arranged between the flange connection (9) and the electrode clamp, the actuating members (17, 18, 19) for the electrode clamp. 4. Elektrodentragarm nach Anspruch 3, dadurch gekennzeich­net, daß die Elektrodenklemme eine mit dem Armabschnitt (13) verbundene Kontaktbacke (15) und einen mit den Betätigungsorganen (17, 18, 19) verbundenen Spannbügel (8) umfaßt und daß der Spannbügel und die Betätigungs­organe gegenüber dem Armabschnitt elektrisch isoliert sind.4. Electrode support arm according to claim 3, characterized in that the electrode clamp has a contact jaw (15) connected to the arm section (13) and one with the Actuating members (17, 18, 19) connected clamping bracket (8) and that the clamping bracket and the actuators are electrically isolated from the arm portion. 5. Elektrodentragarm nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Flanschverbindung (9) Durchgangsöffnungen (28) für den Spannbügel-Kühlkreis­lauf enthält.5. Electrode support arm according to one of claims 1 to 4, characterized in that the flange connection (9) contains through openings (28) for the clamping bracket cooling circuit. 6. Elektrodentragarm nach Anspruch 5, dadurch gekennzeich­net, daß die Kühlwasserführung zu bzw. von dem Spannbü­gel (8) durch eine Spannbügelzugstange (17) innerhalb des Armabschnitts (13) verläuft.6. Electrode support arm according to claim 5, characterized in that the cooling water guide to or from the clamping bracket (8) through a clamping bracket pull rod (17) within the arm portion (13).
EP89107936A 1988-05-02 1989-05-02 Electrode supporting arm for an electric arc furnace Expired - Lifetime EP0340726B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107936T ATE65871T1 (en) 1988-05-02 1989-05-02 ELECTRODE SUPPORT ARM FOR AN ELECTRIC ARC FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8805807U 1988-05-02
DE8805807U DE8805807U1 (en) 1988-05-02 1988-05-02 Support arm for an electrode of an arc furnace

Publications (2)

Publication Number Publication Date
EP0340726A1 true EP0340726A1 (en) 1989-11-08
EP0340726B1 EP0340726B1 (en) 1991-07-31

Family

ID=6823612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107936A Expired - Lifetime EP0340726B1 (en) 1988-05-02 1989-05-02 Electrode supporting arm for an electric arc furnace

Country Status (9)

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US (1) US5200974A (en)
EP (1) EP0340726B1 (en)
JP (1) JPH0828274B2 (en)
AT (1) ATE65871T1 (en)
DE (2) DE8805807U1 (en)
ES (1) ES2024703B3 (en)
HK (1) HK44693A (en)
SG (1) SG83692G (en)
WO (1) WO1989011203A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236158C1 (en) * 1992-10-20 1994-03-17 Mannesmann Ag Electrode support arm for arc furnaces
EP1901586A1 (en) * 2006-09-18 2008-03-19 Homa Gesellschaft f. Hochstrom- Magnetschalter v. Vollenbroich GmbH & Co. KG Electrode supporting arm

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
IT1288857B1 (en) * 1996-02-29 1998-09-25 Danieli Off Mecc AUTOMATIC CONNECTION SYSTEM OF PNEUMATIC AND HYDRAULIC PIPES IN A COMPOUND ELECTRODE FOR ARC FURNACE
US6377604B1 (en) 2000-11-09 2002-04-23 Dixie Arc, Inc. Current-conducting arm for an electric arc furnace
US6377605B1 (en) 2001-03-02 2002-04-23 Hatch Associates Ltd. Electrode seal for arc furnace
DE10236442A1 (en) * 2002-08-08 2004-02-19 Kark Ag Electrode holder with underside water spray cooling for e.g. steelmaking furnace, insulates electrode cooling unit from electrode holder
DE10311426B4 (en) * 2002-12-20 2016-06-16 Arndt Dung Clamping for a replaceable electrode of an electrofusion unit
DE10261162B4 (en) * 2002-12-20 2016-03-10 Arndt Dung Clamping for the replaceable electrode of an electrofusion unit
DE102004005051A1 (en) * 2004-01-30 2005-08-18 Arndt Dung At the free end of a component of an electric furnace forming Elektrodentragarms interchangeable arranged contact jaw
DE102006027648A1 (en) * 2006-06-13 2007-12-20 Arndt Dung Wall elements for a water-cooled, current-carrying electrode support arm and consisting of such wall elements Elektrodentragarme

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US2494775A (en) * 1946-01-31 1950-01-17 Delaware Engineering Corp Arc electrode support
FR1336823A (en) * 1962-07-25 1963-09-06 Aluminum Francais L Light alloy arm for electric oven
US3433878A (en) * 1965-06-10 1969-03-18 Asea Ab Line transmission in arc furnaces
EP0036473A2 (en) * 1980-03-21 1981-09-30 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Release device for an electrode support in electrical fusion furnaces
EP0184140A2 (en) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Arc furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236158C1 (en) * 1992-10-20 1994-03-17 Mannesmann Ag Electrode support arm for arc furnaces
EP1901586A1 (en) * 2006-09-18 2008-03-19 Homa Gesellschaft f. Hochstrom- Magnetschalter v. Vollenbroich GmbH & Co. KG Electrode supporting arm

Also Published As

Publication number Publication date
JPH03500107A (en) 1991-01-10
JPH0828274B2 (en) 1996-03-21
DE8805807U1 (en) 1989-08-31
US5200974A (en) 1993-04-06
HK44693A (en) 1993-05-14
DE58900195D1 (en) 1991-09-05
EP0340726B1 (en) 1991-07-31
ATE65871T1 (en) 1991-08-15
ES2024703B3 (en) 1992-03-01
WO1989011203A1 (en) 1989-11-16
SG83692G (en) 1992-12-04

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