EP1901586A1 - Bras de support pour électrode - Google Patents

Bras de support pour électrode Download PDF

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Publication number
EP1901586A1
EP1901586A1 EP06019488A EP06019488A EP1901586A1 EP 1901586 A1 EP1901586 A1 EP 1901586A1 EP 06019488 A EP06019488 A EP 06019488A EP 06019488 A EP06019488 A EP 06019488A EP 1901586 A1 EP1901586 A1 EP 1901586A1
Authority
EP
European Patent Office
Prior art keywords
support arm
electrode support
profile
steel plates
plates
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Withdrawn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
EP06019488A
Other languages
German (de)
English (en)
Inventor
Sven Beermann
Udo Hildebrandt
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.)
Homa Gesellschaft F Hochstrom- Magnetschalter V Vollenbroich & Co KG GmbH
Original Assignee
Homa Gesellschaft F Hochstrom- Magnetschalter V Vollenbroich & Co KG 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 Homa Gesellschaft F Hochstrom- Magnetschalter V Vollenbroich & Co KG GmbH filed Critical Homa Gesellschaft F Hochstrom- Magnetschalter V Vollenbroich & Co KG GmbH
Priority to EP06019488A priority Critical patent/EP1901586A1/fr
Priority to US11/857,066 priority patent/US20080069174A1/en
Publication of EP1901586A1 publication Critical patent/EP1901586A1/fr
Withdrawn legal-status Critical Current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
    • H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc

Definitions

  • the present invention relates to an electrode arm for electric arc furnaces with an electrode holder provided at its front end, which has a profile which comprises steel plates which are plated on the outside of the profile with highly electrically conductive plates.
  • Electrode support arms for electric arc furnaces for steel production are used to hold electrodes which are regularly round in cross section and made of graphite. These electrodes are held on an electrode holder formed by the electrode support arm. This is regularly formed by a clamp which grips the electrode circumferentially and thus holds.
  • a Elektrodentragarm is regularly vertically movable in the longitudinal direction of the electrodes to control the penetration depth of the electrode in the electric arc furnace and thus to influence the formation of the arc. Special attention is paid to the gentlest possible use of the electrodes. However, it can happen that, for the melting of scrap, the electrodes impinge on the scrap heap located in the arc furnace at a relatively high speed. An electrode arm is accordingly exposed to high mechanical stresses and must have sufficient rigidity and strength, but should be as light as possible to allow a rapid change in the penetration depth.
  • Electrode support arms are regularly in Passing through the longitudinal direction of the support arm extending cooling channels. With a corresponding cooling channel, coolant, regularly water, is communicated from the rear electrode support arm to the front end.
  • the cooling liquid usually cools the tragarm feature contact surfaces for the electrode, which are usually formed by a contour of the electrode correspondingly formed contact jaw.
  • a relative to the support arm displaceable clamping bracket is cooled, which presses against the electrode on the opposite side of the contact jaw and fixes it to the electrode support arm. Because of the relative mobility of the tension bow this is usually supplied via flexible lines with coolant, which either depart from the support arm and communicate with the flow channels formed there or communicate with the source of the cooling liquid, bypassing the flow channels in the electrode support arm.
  • the electrode support arm here is hollow and has at the front end a flange plate which forms the contact jaw.
  • Such a Elektrodentragarm does not meet the mechanical requirements to be put, since the copper does not have the necessary strength in any case at the tolerated weight of a support arm of about 4 to 10 tons.
  • the relatively low melting point there is a risk that copper at the front end of the electrode support arm softens and / or melts when used in the electrode arc furnace.
  • the electrode support arm is formed entirely of aluminum. Because of the low current load, the support arm formed as a hollow profile is itself uncooled. For the clamping bracket of the electrode holder tubes are provided, which are connected from the outside to the clamping bracket and guided in the course within the hollow profile.
  • This support arm has a hollow profile, which is formed by extruded aluminum.
  • the cooling channels are formed within the aluminum material.
  • the enclosed by the hollow profile cavity is not filled with water and thus reduced in weight.
  • the cooling of the profile forming the Elektrodentragarm takes place solely on the recessed in the aluminum cooling channels.
  • an electrode support arm made of aluminum can sometimes not withstand the mechanical stresses and deforms.
  • the support arm is formed of a plurality of welded together flat steel plates, which are plated on its outside with copper.
  • the intimate bonding between the steel and the copper by plating is required to prevent corrosion otherwise due to the high currents, the presence of cooling water in the hollow section, and the thermal stresses of heating and cooling materials of differential thermal expansion in the support arm at the phase boundary between the steel and the copper plate is to be feared.
  • the plating is very complex and expensive.
  • accurate work is required on the welds of the plated steel sheets, which are regularly in the corners of the profile. For welding, first of all, the copper-clad steel sheet must be cut off at an angle.
  • EP-A-0 184 140 The invention is based on the problem of specifying a better meet the requirements of the electrode support arm whose hollow profile has sufficient strength and voltage spikes essentially avoids.
  • the present invention provides an electrode support arm having the features of claim 1.
  • the electrode support arm according to the invention differs from the generic state of the art in that the plated steel plates are provided spaced apart from one another in the circumferential direction of the profile and that the profile is an electrically conductive outer wall formed by the plates clad on the steel plates, electrically conducting plates having.
  • the relatively solid, plated steel plates are provided only in sections in the circumferential direction of the profile. These steel plates plated with well-conducting plates serve the structural integrity of the electrode arm and are interconnected, for example by struts extending within the profile or the like.
  • the plated steel plates thus form the support frame of the support arm.
  • connecting segments are provided which are connected to the plates plated on the steel plates of good electrically conductive material, preferably welded or soldered.
  • These connecting segments only form together with the plates plated on the steel plates a substantially circumferentially closed outer wall of the profile, which assumes the electrical conduction of the current conducted to the electrode.
  • the outer wall is thereafter alternately circumferentially formed by wall segments formed by the conductive plates plated on the steel plates and partly by connecting segments provided between individual steel plates and electrically well connected to the plates of good electrical conductivity plated on the steel plates.
  • the profile according to the invention can be in a conventional manner a hollow profile, which is flowed through a total of a cooling liquid and can be divided by drawn into the profile bulkhead in cooling channels for feeding and discharging the cooling liquid.
  • the connecting segments preferably have cooling channels on their inner side. These cooling channels are assigned to the connecting segments, i. H. do not need the entire inner area of the cavity.
  • the cooling channels may for example be soldered or welded to the inside of the connecting segments or be recessed inside in the connecting segments.
  • the steel plates own cooling means may be assigned, for example in the form of provided on the inside of the steel plates cooling channels, the tubes is attached to the inner surface of the steel plates or the outer wall is formed by the inner wall of the steel plates.
  • the steel plates associated cooling channels do not occupy the entire interior of the profile designed as a hollow profile.
  • a cooling device is assigned and that the plated steel plates are dimensioned in the direction of travel direction so that a sufficient cooling the plated steel plates by heat conduction into the cooled connection segments.
  • the cooling devices associated with the connection segments provide effective heat removal there.
  • the steel plates are dimensioned in the direction of the traveling extension so that a sufficient cooling of the externally arranged plated steel plates takes place by heat conduction, especially in the plane of plated on the steel plates plates of electrically good conductive material.
  • connecting segments which form the outer wall of the profile
  • such components are understood, which are formed from a highly electrically conductive material and connected to the plated steel plates, preferably frontally abut the plates plated on the steel plates of electrically good conductive material and with these plates form a wall substantially free of edges on the outside.
  • the connecting segments and welds connecting the plated steel plates may be visible on the outer wall of the profile.
  • the connecting segments and the plated plates are formed from the same material, preferably provided with the same wall thickness.
  • materials for forming the plated-on plates and the connecting segments in particular aluminum and copper come into question.
  • the connecting segments have different sections, namely two usually straight sections and a radii section provided therebetween.
  • the first-mentioned sections are connected to the adjacent steel plates of the associated connecting segment and continue the plates plated on these steel plates from a material that is highly electrically conductive.
  • the aforementioned, preferably rectilinear portions of the connecting segments are not necessarily provided offset at an angle of 90 ° to each other. Adjacent steel plates can also be in another Angle offset 90 ° to each other, for example, to form a polygonal profile.
  • the radius of the radii portion should be relatively large, for example, have a ratio of inner radius of curvature to wall thickness of the connecting segment of 1.25 and more. The ratio should preferably be above 2.25 and more preferably above 2.45.
  • the stiffening is done by connecting the steel plates together.
  • the steel plates can be connected to face plates, which extend within the profile and form flow channels for the coolant in the profile.
  • the face plates then take on two functions, namely on the one hand the stiffening of the steel plates against each other and on the other the function of a bulkhead for the formation of flow channels for cooling the support arm.
  • a particularly effective cooling in a relatively rigid design of the electrode support arm and low weight of the same results according to a preferred embodiment in which in the circumferential direction to successive steel plates are connected by spaced from the associated connecting segments Strebssegmente, between them and the inner surface of the outer wall a Train flow channel.
  • the flow channel is then formed on the inside of the profile by the longwall segment and on the outside by the inner surface of the connecting segment.
  • the coolant is thereby passed only in the remaining space between the connecting segment and the associated longwall segment.
  • the longwall segments can have any desired geometric configuration and can be adapted to the shape of the connecting segments, in particular with regard to a relatively narrow flow cross section of the cooling channels.
  • the connecting element assigned to this longwall segment is preferably curved outwards relative to the corresponding longwall segment.
  • a profile can be produced as a hollow profile, the outer surface of which is formed in part by the plated straight steel plates and partly by the curved connecting segments and in which further steel plates extend as long segments that connect adjacent plated steel plates together. It then results in a polygonal, formed by the interconnected steel plates support structure of the support arm, whose electrically conductive outer wall partially rests directly as plated plates on the steel plates and extends partially spaced from the longwall segments and is cooled here in any case by coolant, which by the Support arm is passed between the longwall segment and the associated connection segment.
  • a profile which is designed as a hollow rectangular profile and comprises four connecting segments which extend between orthogonally oriented plated steel sheets and form as generously curved metal sheets the corners of the rectangular profile.
  • the stiffening this profile profile segments form an octagon together with the plated plates of electrically good conductive material having steel plates.
  • one or more supports can be provided between the longwall segments and the associated connecting segment, by which means the connecting segment is less susceptible to deformation due to external impacts or the like.
  • the hollow profile is designated by reference numeral 1.
  • the profile 1 has four identically formed plated steel plates 2 comprising a steel plate 3 and a copper plate 4 plated thereon. Between these plated steel plates 2 are each connecting segments 5, which are formed of copper and each comprise two straight sections 6 and arranged between these sections 6 curved portion 7, which in this case forms a 90 ° corner.
  • the connecting segments 5 are each welded to the front side with the copper plates 4.
  • the strength of the connecting segments 5 essentially corresponds to the thickness of the copper plates 4.
  • the connecting segments 5 to the welded steel seams connecting the plated steel plates 2 are identified by reference number 8.
  • the steel plates 3 in the circumferential direction of adjacent plated plates 2 are connected to each other via longwall segments 9, which in the present case are formed by flat steel plates in the material of the steel plates 3.
  • These longwall segments 9 are welded to the front side with the steel plates 3 and form with these the stable polygonal support structure of the hollow profile 1.
  • the longwall segments 9 form the inner wall of a cooling channel 10 for each individual connecting segment 5.
  • these cooling channels 10 is in each case a support 11 which extend between the corresponding longwall segments 9 and the associated connecting segment 5 and the respective connecting segment 5 less susceptible to Make deformation by external shocks.
  • the predominant part of the interior of the hollow profile 1, ie the area enclosed by the steel plates 3 and 3 Strebsegmenten space 12 is not filled with water, but only with air.
  • 12 supply or control or sensor lines can be located within this space, for example to a drive which is provided at the front end of the electrode support arm and clamps the tensioning bow.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP06019488A 2006-09-18 2006-09-18 Bras de support pour électrode Withdrawn EP1901586A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06019488A EP1901586A1 (fr) 2006-09-18 2006-09-18 Bras de support pour électrode
US11/857,066 US20080069174A1 (en) 2006-09-18 2007-09-18 Electrode Support Arm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06019488A EP1901586A1 (fr) 2006-09-18 2006-09-18 Bras de support pour électrode

Publications (1)

Publication Number Publication Date
EP1901586A1 true EP1901586A1 (fr) 2008-03-19

Family

ID=37845122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06019488A Withdrawn EP1901586A1 (fr) 2006-09-18 2006-09-18 Bras de support pour électrode

Country Status (2)

Country Link
US (1) US20080069174A1 (fr)
EP (1) EP1901586A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014001713B3 (de) * 2014-02-11 2015-03-26 Badische Stahl-Engineering Gmbh Elektrodentragarmkörper mit Tragkörper
FR3045268A1 (fr) * 2015-04-01 2017-06-16 Clesid Lorber Bras conducteur en acier amagnetique renforce par un materiau a basse resistivite

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0061612A1 (fr) * 1981-03-24 1982-10-06 Fried. Krupp Gesellschaft mit beschränkter Haftung Système de conducteurs pour courant intense pour fours électriques
EP0184140A2 (fr) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Four à arc
EP0340726A1 (fr) * 1988-05-02 1989-11-08 Uwe Kark Bras de support pour électrode d'un four à arc électrique
DE9216411U1 (de) * 1992-10-20 1993-01-28 Mannesmann AG, 4000 Düsseldorf Elektrodentragarm für Lichtbogenöfen
US6377604B1 (en) * 2000-11-09 2002-04-23 Dixie Arc, Inc. Current-conducting arm for an electric arc furnace

Family Cites Families (2)

* 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
US3602624A (en) * 1970-03-11 1971-08-31 Dixie Bronze Co Unitized electrode holder for electric furnace electrodes or the like

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0061612A1 (fr) * 1981-03-24 1982-10-06 Fried. Krupp Gesellschaft mit beschränkter Haftung Système de conducteurs pour courant intense pour fours électriques
EP0184140A2 (fr) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Four à arc
EP0340726A1 (fr) * 1988-05-02 1989-11-08 Uwe Kark Bras de support pour électrode d'un four à arc électrique
DE9216411U1 (de) * 1992-10-20 1993-01-28 Mannesmann AG, 4000 Düsseldorf Elektrodentragarm für Lichtbogenöfen
US6377604B1 (en) * 2000-11-09 2002-04-23 Dixie Arc, Inc. Current-conducting arm for an electric arc furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014001713B3 (de) * 2014-02-11 2015-03-26 Badische Stahl-Engineering Gmbh Elektrodentragarmkörper mit Tragkörper
EP2928267A1 (fr) 2014-02-11 2015-10-07 Badische Stahl-Engineering GmbH Corps de bras de support d'electrode avec corps de bras de support
FR3045268A1 (fr) * 2015-04-01 2017-06-16 Clesid Lorber Bras conducteur en acier amagnetique renforce par un materiau a basse resistivite

Also Published As

Publication number Publication date
US20080069174A1 (en) 2008-03-20

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