EP0340726B1 - Bras de support pour électrode d'un four à arc électrique - Google Patents

Bras de support pour électrode d'un four à arc électrique Download PDF

Info

Publication number
EP0340726B1
EP0340726B1 EP89107936A EP89107936A EP0340726B1 EP 0340726 B1 EP0340726 B1 EP 0340726B1 EP 89107936 A EP89107936 A EP 89107936A EP 89107936 A EP89107936 A EP 89107936A EP 0340726 B1 EP0340726 B1 EP 0340726B1
Authority
EP
European Patent Office
Prior art keywords
arm
electrode
arm part
coolant
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.)
Expired - Lifetime
Application number
EP89107936A
Other languages
German (de)
English (en)
Other versions
EP0340726A1 (fr
Inventor
Uwe Kark
Karl-Heinz Dr. Klein
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.)
Badische Stahl Engineering GmbH
Original Assignee
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/de
Publication of EP0340726A1 publication Critical patent/EP0340726A1/fr
Application granted granted Critical
Publication of EP0340726B1 publication Critical patent/EP0340726B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 steelmaking are held by support arms, which at the end have an electrode clamp and are in turn held on support columns, which allow height adjustment. Cooling water guiding devices are provided for cooling the electrode clamp 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 outlay, it has also been proposed to produce the entire support arm from copper and to design it to be live (US Pat. No. 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 clamp. Part of the power supply to the tensioning device is also routed through the flange connection.
  • the coolant is supplied to the electrode clamp 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 is would have proven in practice; at least for larger furnaces, the unfavorable relationship between strength and weight of copper as a support arm material seems quite unfavorable.
  • EP-A-0184140 This defect is remedied by another known construction (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 to connect to a contact jaw of the electrode clamp. In practice, however, an absolutely uniform, large-area transition contact cannot be guaranteed, so that local overheating can occur, which can lead to destruction, particularly in the case of material sensitive to oxidation.
  • the support arm which is made of aluminum and which is current-carrying in its entirety, is therefore not connected to the electrode clamp via a flange connection, but rather the end plate which delimits the support arm at the end is welded to the profile parts forming the electrode clamp.
  • This avoids the problematic contact current transition in the area of a flange connection.
  • the invention has for its object to provide an electrode support arm that is less expensive than a steel arm clad with copper or aluminum and allows a releasable, current-carrying flange connection with the arm part forming the electrode clamp.
  • the design of the arm made of light metal makes it possible to dispense with a steel core despite sufficient stability.
  • the problems that arise in the current-carrying flange area due to the tendency of the light metal to oxidize, in particular at a higher temperature and its susceptibility to burning if there is insufficient contact, are avoided according to the invention in that the flange plates are in the immediate vicinity of the coolant cavities and due to the intensive heat exchange with the flowing cooling medium in the Through openings are cooled particularly effectively. This does not eliminate local power shortcomings, but its consequences are reduced because local overheating does not occur to a dangerous degree. In addition, external connecting pipes are thereby avoided.
  • the flange connection is expediently formed not only on the side of the rear arm part but also on the side of the front arm part by a flange plate which is made of light metal and is involved in the formation of the coolant cavity of the corresponding part of the front arm part.
  • Actuators must be provided for the electrode clamp, which generally consist of a tie 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 front arm part. This has the advantage that the actuators can also be replaced by changing the front arm part.
  • 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 a front arm part 6, which consists of a fixed arm section 7 and an electrode clamp 8.
  • the front arm part 6 with the electrode clamp can be separated from the arm part 10 lying behind it by means of the flange connection 9.
  • the support arm 4, at least its rear part 10 and preferably also the arm section 7 of the front arm part 6, is made of aluminum and as such is designed to carry current.
  • the rear 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 front arm part 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 rear or front arm part 10, 6 and therefore, like this, consist of aluminum or aluminum alloy.
  • the arm-fixed part of the front arm part 6 consists of the elongated arm section 7 or 13 which continues the rear arm part 10 and a forked part 14 which belongs to the electrode clamp and has contact jaws 15 which hold the electrode 3 and form a low-resistance current transfer concern about this.
  • the clamp 38 of the electrode clamp is ring-shaped closed with a pressure jaw 16 and is pulled to generate the holding voltage by a pull rod 17 under the action of a spring plate assembly 18 to the rear.
  • the spring assembly can be compressed and the clamping bracket can be pushed forward for the electrode change.
  • the arm section 7, the arm-fixed, bifurcated part 14 and the clamping bracket 38 of the electrode clamp 8 are hollow in a known manner for receiving cooling water.
  • the tensioning bracket 38 can be produced in a conventional manner, for example from alloy steel.
  • the cooling water cavities 20 of the arm section 7 of the front arm part 6 communicate with the cooling water cavities 29 of the rear arm part 10 via cooling water passage 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.
  • a transition chamber 25 can be provided, as indicated by dash-dotted lines in FIG. 2 be 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 38, so that the one indicated by dash-dotted arrows in Fig. 2 Flow course can result.
  • the contact jaws 15 are connected in one piece to the forked, arm-fixed part 14 of the electrode clamp, i.e. 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 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.

Landscapes

  • 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)

Claims (6)

1. Bras porte-électrode (4) destiné à un four à arc électrique (1) et fait d'un matériau de haute conductibilité pour être parcouru par le courant, caractérisé par une partie arrière de bras (10) en métal léger et par une partie avant de bras (6) qui est raccordée à la partie arrière par un joint conducteur à brides (9), comporte une pince à électrode (8) et contient un circuit de liquide de refroidissement parcourant la partie arrière et la partie avant de bras, le joint à brides (9) comprenant deux plaques de bride (11, 12) appliquées l'une contre l'autre, dont l'une est raccordée à la partie arrière de bras (10) et limite au moins une chambre de liquide de refroidissement (29) prévue dans la partie arrière de bras, et dont l'autre est raccordée à la partie avant de bras (6) et limite au moins une chambre de liquide de refroidissement (20) prévue dans la partie avant de bras, ces plaques contenant des ouvertures de passage de liquide de refroidissement (21) pour mettre en communication ces chambres de liquide de refroidissement (20, 29).
2. Bras porte-électrode selon la revendication 1, caractérisé en ce que la région (7) de la partie avant de bras qui est contiguë au joint à brides (9) est faite elle aussi de métal léger.
3. Bras porte-électrode selon la revendication 1 ou 2, caractérisé en ce que la partie avant de bras (6) présente, entre le joint à brides (9) et la pince à électrode (8; 14, 15, 16, 38), un segment de bras (13) qui contient des organes d'actionnement (17, 18, 19) pour la pince à électrode.
4. Bras porte-électrode selon la revendication 3, caractérisé en ce que la pince à électrode comprend une mâchoire de contract (15) raccordée au segment de bras (13) et un étrier de serrage (38) raccordé aux organes d'actionnement (17, 18, 19), et en ce que l'étrier de serrage et les organes d'actionnement sont isolés électriquement par rapport au segment de bras.
5. Bras porte-électrode selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un circuit de liquide de refroidissement est prévu pour le refroidissement de l'étrier de serrage et les plaques de bride (11, 12) contiennent des ouvertrues de passage (28) pour le circuit de liquide de refroidissement de l'étrier de serrage.
6. Bras porte-électrode selon la revendication 5, caractérisé en ce que la conduite de liquide de refroidissement vers ou à partir de l'étrier de serrage (38) s'étend à travers une tige de traction d'étrier de serrage (17) à l'intérieur du segment de bras (13).
EP89107936A 1988-05-02 1989-05-02 Bras de support pour électrode d'un four à arc électrique Expired - Lifetime EP0340726B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107936T ATE65871T1 (de) 1988-05-02 1989-05-02 Elektrodentragarm fuer einen elektrischen lichtbogenofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8805807U 1988-05-02
DE8805807U DE8805807U1 (fr) 1988-05-02 1988-05-02

Publications (2)

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

Family

ID=6823612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107936A Expired - Lifetime EP0340726B1 (fr) 1988-05-02 1989-05-02 Bras de support pour électrode d'un four à arc électrique

Country Status (9)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594272B1 (fr) * 1992-10-20 1997-09-03 MANNESMANN Aktiengesellschaft Bras de support pour électrode d'un four à arc électrique

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1288857B1 (it) * 1996-02-29 1998-09-25 Danieli Off Mecc Sistema automatico di connessione delle tubazioni pneumatiche e idrauliche in un elettrodo composto per forno ad arco
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 (de) * 2002-08-08 2004-02-19 Kark Ag Elektrodenkühleinrichtung
DE10311426B4 (de) * 2002-12-20 2016-06-16 Arndt Dung Einspannung für eine auswechselbare Elektrode eines Elektroschmelzaggregats
DE10261162B4 (de) * 2002-12-20 2016-03-10 Arndt Dung Einspannung für die auswechselbare Elektrode eines Elektroschmelzaggregats
DE102004005051A1 (de) * 2004-01-30 2005-08-18 Arndt Dung Am freien Ende eines Bestandteil eines Elektroofens bildenden Elektrodentragarms auswechselbar angeordnete Kontaktbacke
DE102006027648A1 (de) * 2006-06-13 2007-12-20 Arndt Dung Wandungselemente für einen wassergekühlten, stromführenden Elektrodentragarm und aus solchen Wandungselementen bestehende Elektrodentragarme
EP1901586A1 (fr) * 2006-09-18 2008-03-19 Homa Gesellschaft f. Hochstrom- Magnetschalter v. Vollenbroich GmbH & Co. KG Bras de support pour électrode

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2133329A (en) * 1936-09-01 1938-10-18 Pittsburgh Res Corp Method for heat treating furnace linings
US2148834A (en) * 1937-03-13 1939-02-28 Payne William Harvey Clamping mechanism for electric arc furnace electrodes
US2386260A (en) * 1943-09-16 1945-10-09 Payne William Harvey Mounting for electric arc furnace electrodes
US2494775A (en) * 1946-01-31 1950-01-17 Delaware Engineering Corp Arc electrode support
US2538603A (en) * 1946-07-17 1951-01-16 Thys Edouard Furnace electrode holder
US2623080A (en) * 1950-10-05 1952-12-23 Volta Mfg Co Ltd Electrode retainer
FR1336823A (fr) * 1962-07-25 1963-09-06 Aluminum Francais L Bras en alliage léger pour four électrique
SE322850B (fr) * 1965-06-10 1970-04-20 Asea Ab
US3444305A (en) * 1968-06-13 1969-05-13 Alfred H Turner Electrode head for electric furnace electrodes
US3602624A (en) * 1970-03-11 1971-08-31 Dixie Bronze Co Unitized electrode holder for electric furnace electrodes or the like
US3686421A (en) * 1971-08-30 1972-08-22 Edgar Wunsche Unitized electride holder and arm for electric arc furnace electrodes or the like
US4182927A (en) * 1978-08-04 1980-01-08 Dixie Bronze Company Electrode holders having differential clamping devices
DE3010894C2 (de) * 1980-03-21 1985-12-12 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 4200 Oberhausen Elektroden-Tragarm mit Öffnungsvorrichtung für Klemmbacken von elektrischen Lichtbogenöfen
IT1208697B (it) * 1984-09-18 1989-07-10 Elettrocarbonium Spa Colonna elettrodica ruotante in carbone o grafite da impiegare nei forni ad arco sia aperto sia sommerso
US4682341A (en) * 1984-11-29 1987-07-21 Fuchs Systemtechnik Gmbh Electric arc furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594272B1 (fr) * 1992-10-20 1997-09-03 MANNESMANN Aktiengesellschaft Bras de support pour électrode d'un four à arc électrique

Also Published As

Publication number Publication date
ES2024703B3 (es) 1992-03-01
SG83692G (en) 1992-12-04
JPH03500107A (ja) 1991-01-10
ATE65871T1 (de) 1991-08-15
DE8805807U1 (fr) 1989-08-31
WO1989011203A1 (fr) 1989-11-16
JPH0828274B2 (ja) 1996-03-21
US5200974A (en) 1993-04-06
EP0340726A1 (fr) 1989-11-08
HK44693A (en) 1993-05-14
DE58900195D1 (de) 1991-09-05

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