EP0234270A1 - Three-phase arc furnace - Google Patents

Three-phase arc furnace Download PDF

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Publication number
EP0234270A1
EP0234270A1 EP87100782A EP87100782A EP0234270A1 EP 0234270 A1 EP0234270 A1 EP 0234270A1 EP 87100782 A EP87100782 A EP 87100782A EP 87100782 A EP87100782 A EP 87100782A EP 0234270 A1 EP0234270 A1 EP 0234270A1
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EP
European Patent Office
Prior art keywords
arc furnace
contact jaws
electrodes
contact
electrode
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.)
Withdrawn
Application number
EP87100782A
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German (de)
French (fr)
Inventor
Thomas H. Dr. Taube
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C Conradty Nuernberg GmbH and Co KG
Original Assignee
C Conradty Nuernberg GmbH and Co KG
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Filing date
Publication date
Application filed by C Conradty Nuernberg GmbH and Co KG filed Critical C Conradty Nuernberg GmbH and Co KG
Publication of EP0234270A1 publication Critical patent/EP0234270A1/en
Withdrawn legal-status Critical Current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
    • 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
    • H05B7/11—Arrangements for conducting current to the electrode terminals

Definitions

  • the invention relates to a
  • Three-phase arc furnace in particular for melting, alloying and / or keeping warm steel according to the preamble of claim 1.
  • an arc furnace which corresponds to the preamble of claim 1.
  • the contact jaws attack the electrodes at a distance of at least twice the electrode diameter for geometric reasons.
  • the contact jaws arranged in the electrode sockets normally lie on a circle of the same size as the electrode pitch circle, the center of which is shifted by the electrode radius in the direction of the transformer house.
  • the pitch circle radius in such an arrangement is at least 1.15 times the electrode diameter. If the current tubes are laid parallel to the contact jaws, the distance between the geometric centers thereof is twice the electrode diameter.
  • the construction caused by this arrangement also has the disadvantage that the outer long support arms tend to lateral vibrations, which can lead to the electrodes breaking at the clamping point on the support arm. Furthermore, it has been shown in practice that the maintenance of the middle support arm is complex due to the poor accessibility.
  • the object of the invention is therefore to provide an electric arc furnace of the type mentioned in the introduction, in which an optimal current application of the contact jaws is ensured and the reactance of the overall arrangement is reduced by minimizing the spacing of the power tubes.
  • the contact jaws therefore lie on the radii of the electrode subcircuit through the respective axis of the electrodes and on the side of the electrodes facing the center of the electrode circuit.
  • the contact surface of the respective contact jaw with the associated electrode naturally points outwards with respect to the center of the electrode pitch circle.
  • the arrangement according to the invention inevitably results in the middle support arm being the longer one, which promotes the accessibility of the electrode holder and its ease of maintenance. At the same time, the mechanical lateral vibrations of phases 1 and 3 are minimized.
  • the arrangement according to the invention allows the distance between the contact jaws between the individual phases to be equal to or smaller than the diameter of the electrodes.
  • the electrode pitch circle is reduced accordingly and the current applied to the contact jaws is even more even.
  • An advantageous further development of the invention consists in that the high-flow tubes are laid continuously parallel from the connecting flanges of the contact jaws on the support arm, as a result of which the distance between the tubes is halved, measured using conventional technology. This of course reduces the electrode pitch circuit by the same factor.
  • the pliers-like tensioning mechanism for the outer support arms which is also provided according to the invention, makes it possible in a simple manner to optimally hold the corresponding electrodes in the desired arrangement of the contact jaws.
  • the three electrodes of an electric arc furnace are designated by 1. These are along an electrode pitch circuit 2 at the same distance from one another, i.e. symmetrical, arranged.
  • the electrodes 1 are held here in a manner not shown in more detail by means of a tensioning device on supporting arms, also not shown, with current tubes 3 guided parallel to one another and horizontally thereon.
  • the electrical connection between the power tubes 3 and the transformer 6 is made with power cables 7.
  • the vertical adjustment of the electrodes takes place via a lifting device 4.
  • the electrodes 1 are each supplied with current via a contact jaw 5.
  • these contact jaws 5 are now arranged centrally symmetrically within the electrode subcircuit 2. This means that the respective contact jaw 5 lies on the radius 2a through the respective axis la of the corresponding electrode 1. Naturally, the contact surface 5a of the respective contact jaw 5 with the associated electrode 1 points outwards with respect to the center of the electrode pitch circle 2.
  • Fig. 2 also shows a schematic representation of a first embodiment of a clamping device for arranging the contact jaw 5 according to the invention, in particular for phases 1 and 3, i.e. the outer support arms 3.
  • the pliers-like tensioning device which is designated overall by 10, consists of a mounted on a bearing 15, i. fixed pliers part 11 and a pliers part 12 movable around the joint 13.
  • the clamping device 10 is closed, the electrode 1 is gripped between the pressure jaw 14 and the contact jaw 5 arranged on the fixed pliers part 11.
  • Fig. 3 shows, also shown schematically, a second embodiment of a pliers-like clamping device, also in particular for the two outer support arms 3.
  • This clamping device designated as a whole by 20, also consists of a fixed pliers part 21 mounted on the bearing 25 and a movable pliers part 22 which is pivotable about a joint 23 with respect to the fixed pliers part 21.
  • the pressure jaw 24 is arranged on the movable pliers part 22, while the contact jaw 5, which is diametrically opposite in the clamping position, is located on the fixed pliers part 21.

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

Abstract

Bei diesem Lichtbogenofen, insbesondere zum Schmelzen von Stahl, sind drei symmetrisch auf einem Kreis angeordnete Elektroden (1) durch an horizontalen Tragarmen gelagerte Kontaktbacken (5) an den Phasen angeschlossen. Zur Optimierung der Strombeaufschlagung der Kontaktbacken (5) und zur Verminderung der Reaktanzverluste der Gesamtanordnung sind die Kontaktbacken (5) zentralsymmetrisch innerhalb des Elektrodenteilkreises (2) angeordnet.In this arc furnace, in particular for melting steel, three electrodes (1) arranged symmetrically on a circle are connected to the phases by contact jaws (5) mounted on horizontal support arms. To optimize the current applied to the contact jaws (5) and to reduce the reactance losses of the overall arrangement, the contact jaws (5) are arranged centrally symmetrically within the electrode partial circuit (2).

Description

Die Erfindung betrifft einenThe invention relates to a

Drehstrom-Lichtbogenofen, insbesondere zum Schmelzen, Legieren und/oder Warmhalten von Stahl gemäß dem Oberbegriff des Patentanspruchs 1.Three-phase arc furnace, in particular for melting, alloying and / or keeping warm steel according to the preamble of claim 1.

Aus der DE-PS 31 14 145 ist ein Lichtbogenofen bekannt, der dem Oberbegriff des Patentanspruchs 1 entspricht. Bei diesem elektrischen Lichtbogenofen greifen die Kontaktbacken aus geometrischen Gründen in einem Abstand von minimal einem doppelten Elektrodendurchmesser an den Elektroden an. Die in den Elektrodenfassungen angeordneten Kontaktbacken liegen normalerweise auf einem zum Elektrodenteilkreis gleich großen Kreis, dessen Mittelpunkt um den Elektrodehradius in Richtung Trafohaus verschoben ist. Der-Teilkreisradius beträgt bei solch einer Anordnung mindestens das 1.15-fache des Elektrodendurchmessers. Bei paralleler Verlegung der Stromrohre zu den Kontaktbacken liegt der Abstand der geometrischen Zentren derselben beim doppelten Elektrodendurchmesser.From DE-PS 31 14 145 an arc furnace is known which corresponds to the preamble of claim 1. In this electric arc furnace, the contact jaws attack the electrodes at a distance of at least twice the electrode diameter for geometric reasons. The contact jaws arranged in the electrode sockets normally lie on a circle of the same size as the electrode pitch circle, the center of which is shifted by the electrode radius in the direction of the transformer house. The pitch circle radius in such an arrangement is at least 1.15 times the electrode diameter. If the current tubes are laid parallel to the contact jaws, the distance between the geometric centers thereof is twice the electrode diameter.

Bei diesem bekannten Lichtbogenofen ist nachteilig, daß aufgrund der zum Stromverlauf asymmetrischen Anordnung der Kontaktbacken auf den äußeren Kontaktbacken wegen des Näherungseffektes (proximity effect) die Stromdichte auf dem zur zentral angeordneten Elektrode zeigenden Teil der Kontaktbacke höher ist als auf der nach außen zeigenden Seite.In this known arc furnace it is disadvantageous that, due to the asymmetrical arrangement of the contact jaws on the outer contact jaws due to the proximity effect, the current density on the part of the contact jaw facing the centrally arranged electrode is higher than on the side facing outwards.

Die durch diese Anordnung bedingte Bauweise hat ferner den Nachteil, daß die äußeren langen Tragarme zu Lateralschwingungen neigen, die dazu führen können, daß die Elektroden an der Einspannstelle am Tragarm brechen. Ferner hat sich in der Praxis gezeigt, daß die Wartung des mittleren Tragarmes aufgrund der schlechten Zugänglichkeit aufwendig ist.The construction caused by this arrangement also has the disadvantage that the outer long support arms tend to lateral vibrations, which can lead to the electrodes breaking at the clamping point on the support arm. Furthermore, it has been shown in practice that the maintenance of the middle support arm is complex due to the poor accessibility.

Aufgabe der Erfindung ist es daher, einen Lichtbogenofen der eingangs genannten Art zu schaffen, bei dem eine optimale Strombeaufschlagung der Kontaktbacken gewährleistet sowie durch Minimierung der Abstände der Stromrohre untereinander die Reaktanz der Gesamtanordnung vermindert ist.The object of the invention is therefore to provide an electric arc furnace of the type mentioned in the introduction, in which an optimal current application of the contact jaws is ensured and the reactance of the overall arrangement is reduced by minimizing the spacing of the power tubes.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Kontaktbacken zentralsymmetrisch innerhalb des Elektrodenkreises angeordnet sind.This object is achieved in that the contact jaws are arranged centrally symmetrically within the electrode circuit.

Bei der erfindungsgemäßen Anordnung liegen also die Kontaktbacken auf den Radien des Elektrodenteilkreises durch die jeweilige Achse der Elektroden und auf der dem Mittelpunkt des Elektrodenkreises zugewandten Seite der Elektroden. Dabei zeigt natürlich die Kontaktfläche der jeweiligen Kontaktbacke mit der zugehörigen Elektrode in bezug auf den Mittelpunkt des Elektrodenteilkreises nach außen.In the arrangement according to the invention, the contact jaws therefore lie on the radii of the electrode subcircuit through the respective axis of the electrodes and on the side of the electrodes facing the center of the electrode circuit. The contact surface of the respective contact jaw with the associated electrode naturally points outwards with respect to the center of the electrode pitch circle.

Bei dem erfindungsgemäßen Lichtbogenofen ergibt sich eine gleichmäßige Strombeaufschlagung der Kontaktbacken. Darüber hinaus werden die Reaktanzverluste vermindert.In the arc furnace according to the invention, there is a uniform current applied to the contact jaws. In addition, the reactance losses are reduced.

Aus der erfindungsgemäßen Anordnung resultiert des weiteren zwangsläufig, daß der mittlere Tragarm der längere ist, was die Zugänglichkeit der Elektrodenfassung und deren Wartungsfreundlichkeit fördert. Zugleich werden die mechanischen Lateral-Schwingungen der Phasen 1 und 3 minimiert.Furthermore, the arrangement according to the invention inevitably results in the middle support arm being the longer one, which promotes the accessibility of the electrode holder and its ease of maintenance. At the same time, the mechanical lateral vibrations of phases 1 and 3 are minimized.

Des weiteren wird der Platzbedarf für die Elektroden auf dem Deckel geringer, so daß mehr Spielraum für ein viertes und fünftes Deckelloch entsteht. Diese öffnungen können für die Absaugung und die Chargierung von Zuschlagsstoffen verwendet werden. Diese Anordnung ist insbesondere für Pfannenöfen von Vorteil, da durch einen möglichst kleinen Elektrodenteilkreis die feuerfeste Zustellung des Pfannenrandes optimal geschont wird.Furthermore, the space required for the electrodes on the cover is reduced, so that there is more scope for a fourth and fifth cover hole. These openings can be used for the extraction and charging of aggregates. This arrangement is particularly advantageous for pan ovens, since the refractory infeed of the pan edge is optimally protected by the smallest possible electrode pitch circle.

Die erfindungsgemäße Anordnung läßt es zu, daß der Abstand der Kontaktbacken zwischen den einzelnen Phasen gleich bzw. kleiner dem Durchmesser der Elektroden ist. Der Elektrodenteilkreis verringert sich entsprechend und die Strombeaufschlagung der Kontaktbacken wird noch weiter vergleichmäßigt.The arrangement according to the invention allows the distance between the contact jaws between the individual phases to be equal to or smaller than the diameter of the electrodes. The electrode pitch circle is reduced accordingly and the current applied to the contact jaws is even more even.

Eine vorteilhafte Weiterbildung der Erfindung besteht darin, daß die Hochstromrohre von den Anschlußflanschen der Kontaktbacken auf dem Tragarm durchgehend parallel verlegt sind, wodurch sich der Abstand der Rohre untereinander halbiert, gemessen an der herkömmlichen Technik. Der Elektrodenteilkreis verringert sich dadurch natürlich um denselben Faktor.An advantageous further development of the invention consists in that the high-flow tubes are laid continuously parallel from the connecting flanges of the contact jaws on the support arm, as a result of which the distance between the tubes is halved, measured using conventional technology. This of course reduces the electrode pitch circuit by the same factor.

Der des weiteren erfindungsgemäß vorgesehene zangenartige Spannmechanismus für die äußeren Tragarme ermöglicht in einfacher Weise eine optimale Halterung der entsprechenden Elektroden bei der gewünschten Anordnung der Kontaktbacken.The pliers-like tensioning mechanism for the outer support arms, which is also provided according to the invention, makes it possible in a simple manner to optimally hold the corresponding electrodes in the desired arrangement of the contact jaws.

Ausführungsbeispiele des erfindungsgemäßen Lichtbogenofens sind in schematischer Weise in den Zeichnungen dargestellt.Exemplary embodiments of the arc furnace according to the invention are shown in a schematic manner in the drawings.

Es zeigt:

  • Fig. 1 die wesentlichen Bauteile eines erfindungsgemäßen Lichtbogenofens,
  • Fig. 2 eine Spannvorrichtung für die Elektroden, insbesondere die erste und dritte Phase mit einer erfindungsgemäß angeordneten Kontaktbacke, und
  • Fig. 3 eine weitere Ausführungsform einer Spannvorrichtung mit einer erfindungsgemäß angeordneten Kontaktbacke.
It shows:
  • 1 shows the essential components of an arc furnace according to the invention,
  • 2 shows a clamping device for the electrodes, in particular the first and third phases with a contact jaw arranged according to the invention, and
  • Fig. 3 shows a further embodiment of a clamping device with a contact jaw arranged according to the invention.

Nach Fig. 1 sind die drei Elektroden eines Lichtbogenofens mit 1 bezeichnet. Diese sind längs eines Elektrodenteilkreises 2 in gleichem Abstand zueinander, d.h. symmetrisch, angeordnet. Die Elektroden 1 sind hier in nicht näher dargestellter Weise mittels einer Spannvorrichtung an ebenfalls nicht dargestellten Tragarmen mit darauf parallel zueinander und horizontal geführten Stromrohren 3 gehalten. Die-elektrische Verbindung zwischen den Stromrohren 3 und dem Transformator 6 erfolgt mit Stromseilen 7. Die vertikale Verstellung der Elektroden findet über eine Hubeinrichtung 4 statt. Die Strombeaufschlagung der Elektroden 1 erfolgt jeweils über eine Kontaktbacke 5.1, the three electrodes of an electric arc furnace are designated by 1. These are along an electrode pitch circuit 2 at the same distance from one another, i.e. symmetrical, arranged. The electrodes 1 are held here in a manner not shown in more detail by means of a tensioning device on supporting arms, also not shown, with current tubes 3 guided parallel to one another and horizontally thereon. The electrical connection between the power tubes 3 and the transformer 6 is made with power cables 7. The vertical adjustment of the electrodes takes place via a lifting device 4. The electrodes 1 are each supplied with current via a contact jaw 5.

Erfindungsgemäß sind nun diese Kontaktbacken 5 zentralsymmetrisch innerhalb des Elektrodenteilkreises 2 angeordnet. Dies bedeutet, daß die jeweilige Kontaktbacke 5 auf dem Radius 2a durch die jeweilige Achse la der entsprechenden Elektrode 1 liegt. Dabei zeigt natürlich die Kontaktfläche 5a der jeweiligen Kontaktbacke 5 mit der zugehörigen Elektrode 1 in bezug auf den Mittelpunkt des Elektrodenteilkreises 2 nach außen.According to the invention, these contact jaws 5 are now arranged centrally symmetrically within the electrode subcircuit 2. This means that the respective contact jaw 5 lies on the radius 2a through the respective axis la of the corresponding electrode 1. Naturally, the contact surface 5a of the respective contact jaw 5 with the associated electrode 1 points outwards with respect to the center of the electrode pitch circle 2.

Die Fig. 2 zeigt ebenfalls in schematischer Darstellung eine erste Ausführungsform einer Spannvorrichtung zum erfindungsgemäßen Anordnen der Kontaktbacke 5, insbesondere für die Phasen 1 und 3, d.h. die außenliegenden Tragarme 3. Gemäß Fig. 2 besteht die zangenartige Spannvorrichtung, die insgesamt mit 10 bezeichnet ist, aus einem an einem Lager 15 gelagerten, d.h. feststehenden Zangenteil 11 und einem um das Gelenk 13 beweglichen Zangenteil 12. Bei geschlossener Spannvorrichtung 10 ist die Elektrode 1 zwischen der Druckbacke 14 und der am feststehenden Zangenteil 11 angeordneten Kontaktbacke 5 gefaßt.Fig. 2 also shows a schematic representation of a first embodiment of a clamping device for arranging the contact jaw 5 according to the invention, in particular for phases 1 and 3, i.e. the outer support arms 3. According to Fig. 2, the pliers-like tensioning device, which is designated overall by 10, consists of a mounted on a bearing 15, i. fixed pliers part 11 and a pliers part 12 movable around the joint 13. When the clamping device 10 is closed, the electrode 1 is gripped between the pressure jaw 14 and the contact jaw 5 arranged on the fixed pliers part 11.

Fig. 3 zeigt, ebenfalls schematisch dargestellt, eine zweite Ausführungsform einer zangenartigen Spannvorrichtung, ebenfalls insbesondere für die beiden äußeren Tragarme 3. Diese insgesamt mit 20 bezeichnete Spannvorrichtung besteht ebenfalls aus einem feststehenden, am Lager 25 gelagerten Zangenteil 21 und einem beweglichen Zangenteil 22, der um ein Gelenk 23 in bezug auf den feststehenden Zangenteil 21 schwenkbar ist. Die Druckbacke 24 ist an dem beweglichen Zangenteil 22 angeordnet, während sich die in der Spannstellung diametral gegenüberliegende Kontaktbacke 5 an dem feststehenden Zangenteil 21 befindet.Fig. 3 shows, also shown schematically, a second embodiment of a pliers-like clamping device, also in particular for the two outer support arms 3. This clamping device, designated as a whole by 20, also consists of a fixed pliers part 21 mounted on the bearing 25 and a movable pliers part 22 which is pivotable about a joint 23 with respect to the fixed pliers part 21. The pressure jaw 24 is arranged on the movable pliers part 22, while the contact jaw 5, which is diametrically opposite in the clamping position, is located on the fixed pliers part 21.

Claims (4)

1. Dreiphasiger Lichtbogenofen, insbesondere zum Schmelzen von Stahl, mit drei symmetrisch auf einem Kreis angeordneten Elektroden, die durch an horizontalen Tragarmen gelagerten Kontaktbacken an den Phasen angeschlossen sind, dadurch gekennzeichnet , daß die Kontaktbacken (5) zentralsymmetrisch innerhalb des Elektrodenteilkreises (2) angeordnet sind.1. Three-phase arc furnace, in particular for melting steel, with three electrodes arranged symmetrically on a circle, which are connected to the phases by contact jaws mounted on horizontal support arms, characterized in that the contact jaws (5) are arranged centrally symmetrically within the electrode partial circuit (2) are. 2. Elektrischer Lichtbogenofen nach Anspruch 1, dadurch gekennzeichnet, daß der Abstand der Kontaktbacken (5) zwischen den einzelnen Phasen gleich bzw. kleiner dem Durchmesser der Elektroden (1) ist.2. Electric arc furnace according to claim 1, characterized in that the distance between the contact jaws (5) between the individual phases is equal to or smaller than the diameter of the electrodes (1). 3. Elektrischer Lichtbogenofen nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet , daß die Hochstromrohre von den Anschlußflanschen der Kontaktbacken auf dem Tragarm durchgehend parallel geführt sind und daß der Abstand der Rohre untereinander halbiert ist.3. Electric arc furnace according to one of claims 1 or 2, characterized in that the high-current tubes are continuously parallel from the connecting flanges of the contact jaws on the support arm and that the distance between the tubes is halved. 4. Elektrischer Lichtbogenofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet , daß die Elektroden (1), die an den äußeren Tragarmen (3) gelagert sind, durch einen zangenartigen, die Kontaktbacke (5) enthaltenden Spannmechanismus (10; 20) gehalten sind.4. Electric arc furnace according to one of claims 1 to 3, characterized in that the electrodes (1), which are mounted on the outer support arms (3), held by a pliers-like, the contact jaw (5) containing clamping mechanism (10; 20) are.
EP87100782A 1986-01-23 1987-01-21 Three-phase arc furnace Withdrawn EP0234270A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863601989 DE3601989A1 (en) 1986-01-23 1986-01-23 THREE-PHASE ARC FURNACE
DE3601989 1986-01-23

Publications (1)

Publication Number Publication Date
EP0234270A1 true EP0234270A1 (en) 1987-09-02

Family

ID=6292473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100782A Withdrawn EP0234270A1 (en) 1986-01-23 1987-01-21 Three-phase arc furnace

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Country Link
US (1) US4742529A (en)
EP (1) EP0234270A1 (en)
DE (1) DE3601989A1 (en)
WO (1) WO1987004583A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH97159A (en) * 1921-04-06 1922-12-01 Eisen & Stahlwerke Oehler & Co Adjustable electrode clamp.
US1616797A (en) * 1923-03-05 1927-02-08 Albert E Greene Electrode mechanism for electric furnaces
DE956968C (en) * 1953-06-28 1957-01-24 Demag Elektrometallurgie Gmbh High current supply for electrode furnaces
DE1101648B (en) * 1959-11-21 1961-03-09 Demag Elektrometallurgie Gmbh Current pipes with contact device
FR2419981A1 (en) * 1978-03-18 1979-10-12 Leybold Heraeus Gmbh & Co Kg Appts. for the treatment of liq. metal - comprises heated permanent electrodes which are vertically displaceable into and out of the metal bath

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717445A (en) * 1969-11-12 1973-02-20 Mitsubishi Steel Mfg Electrode holder for electric arc furnace and make the same
FR2517502A1 (en) * 1981-12-01 1983-06-03 Clesid Sa ELECTRODE SUPPLYING AND SUPPORTING DEVICE FOR ARC OVEN
US4653066A (en) * 1984-04-11 1987-03-24 Dixie Arc, Inc. Electrode holder assembly and electrode clamp for electric arc furnaces
DE3421327A1 (en) * 1984-06-05 1985-12-05 Mannesmann AG, 4000 Düsseldorf ELECTRICITY SUPPLY FOR ELECTRO MELTING OVENS

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH97159A (en) * 1921-04-06 1922-12-01 Eisen & Stahlwerke Oehler & Co Adjustable electrode clamp.
US1616797A (en) * 1923-03-05 1927-02-08 Albert E Greene Electrode mechanism for electric furnaces
DE956968C (en) * 1953-06-28 1957-01-24 Demag Elektrometallurgie Gmbh High current supply for electrode furnaces
DE1101648B (en) * 1959-11-21 1961-03-09 Demag Elektrometallurgie Gmbh Current pipes with contact device
FR2419981A1 (en) * 1978-03-18 1979-10-12 Leybold Heraeus Gmbh & Co Kg Appts. for the treatment of liq. metal - comprises heated permanent electrodes which are vertically displaceable into and out of the metal bath

Also Published As

Publication number Publication date
DE3601989A1 (en) 1987-07-30
WO1987004583A1 (en) 1987-07-30
US4742529A (en) 1988-05-03

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