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EP0340726A1 - 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

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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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0340726B1 (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 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.

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)
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 (de) 1988-05-02 1988-05-02 Tragarm für eine Elektrode eines Lichtbogenofens

Publications (2)

Publication Number Publication Date
EP0340726A1 true EP0340726A1 (fr) 1989-11-08
EP0340726B1 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236158C1 (de) * 1992-10-20 1994-03-17 Mannesmann Ag Elektrodentragarm für Lichtbogenöfen
EP1901586A1 (fr) * 2006-09-18 2008-03-19 Homa Gesellschaft f. Hochstrom- Magnetschalter v. Vollenbroich GmbH & Co. KG Bras de support pour électrode

Families Citing this family (8)

* 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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494775A (en) * 1946-01-31 1950-01-17 Delaware Engineering Corp Arc electrode support
FR1336823A (fr) * 1962-07-25 1963-09-06 Aluminum Francais L Bras en alliage léger pour four électrique
US3433878A (en) * 1965-06-10 1969-03-18 Asea Ab Line transmission in arc furnaces
EP0036473A2 (fr) * 1980-03-21 1981-09-30 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Dispositif de desserrage pour support d'électrodes dans des fours à fusion électrique
EP0184140A2 (fr) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Four à arc

Family Cites Families (10)

* 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
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
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
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494775A (en) * 1946-01-31 1950-01-17 Delaware Engineering Corp Arc electrode support
FR1336823A (fr) * 1962-07-25 1963-09-06 Aluminum Francais L Bras en alliage léger pour four électrique
US3433878A (en) * 1965-06-10 1969-03-18 Asea Ab Line transmission in arc furnaces
EP0036473A2 (fr) * 1980-03-21 1981-09-30 M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft Dispositif de desserrage pour support d'électrodes dans des fours à fusion électrique
EP0184140A2 (fr) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Four à arc

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4236158C1 (de) * 1992-10-20 1994-03-17 Mannesmann Ag Elektrodentragarm für Lichtbogenöfen
EP1901586A1 (fr) * 2006-09-18 2008-03-19 Homa Gesellschaft f. Hochstrom- Magnetschalter v. Vollenbroich GmbH & Co. KG Bras de support pour électrode

Also Published As

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

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