EP1901585B1 - Support de bras pour four à arc - Google Patents

Support de bras pour four à arc Download PDF

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Publication number
EP1901585B1
EP1901585B1 EP06019487A EP06019487A EP1901585B1 EP 1901585 B1 EP1901585 B1 EP 1901585B1 EP 06019487 A EP06019487 A EP 06019487A EP 06019487 A EP06019487 A EP 06019487A EP 1901585 B1 EP1901585 B1 EP 1901585B1
Authority
EP
European Patent Office
Prior art keywords
support arm
hollow profile
copper
electrode support
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.)
Active
Application number
EP06019487A
Other languages
German (de)
English (en)
Other versions
EP1901585A1 (fr
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 EP06019487A priority Critical patent/EP1901585B1/fr
Priority to DE200620020336 priority patent/DE202006020336U1/de
Priority to US11/857,088 priority patent/US20080069175A1/en
Publication of EP1901585A1 publication Critical patent/EP1901585A1/fr
Application granted granted Critical
Publication of EP1901585B1 publication Critical patent/EP1901585B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 hollow profile which is formed by at least one copper plate or aluminum-clad steel plate.
  • 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 penetrated by extending in the longitudinal direction of the support arm cooling channels. With a corresponding Cooling channel, coolant, regular 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 is as a hollow profile trained arm even 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.
  • US-A-5,471,496 relates to an electrode support arm for electric arc furnace
  • 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 takes place solely via 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.
  • the present invention is based on the problem of specifying an electrode support arm that better meets the requirements, the hollow profile of which has sufficient strength and substantially avoids voltage spikes.
  • the present invention provides an electrode support arm having the features of claim 1.
  • the hollow profile according to the invention has rounded corners, rounded corners as understood in the context of the invention preferably those corners in which the ratio of inner radius of curvature to wall thickness of the clad steel plate 1.25, preferably 2.25 and more.
  • the support arm according to the invention is not limited to a specific geometric design of the hollow profile.
  • different polygonal shapes are conceivable.
  • a rectangular profile with rounded corners may be preferable.
  • the electrode support arm may just as well have a polygonal, for example five, six or other polygonal cross-sectional shape.
  • the ratio for the smallest radius of curvature of the rounded corner applies.
  • the ratio of the inner radius of curvature to the wall thickness of the clad steel plate may preferably be at least 2.45, more preferably at least 2.6.
  • the at least one plated steel plate forms on the inside a cooling channel for the coolant cooling the forward end of the support arm and diverted into the support arm.
  • the coolant is just not guided in cooling lines, which are recessed within the material forming the hollow profile. Rather, after the development of the electrode support arm, the cavity enclosed by the hollow profile is used to form the at least one flow channel.
  • the hollow profile has at least one profile passing through the bulkhead, which divides the hollow profile into two chambers, of which one chamber forms a front end of the Elektrodentragarms supplying flow channel and the other chamber forms the cooling channel for the outflow for the coolant from the front end. At the transition between the one and the other flow channel, the coolant is deflected in the hollow profile.
  • the hollow profile forms only two cooling channels, through a single, the hollow profile passing through bulkhead.
  • This is preferably formed as a in the horizontal direction in the hollow profile extending partition and forms below the inlet for cooling liquid to the front end of the electrode support arm and in the upper half of the return.
  • the hollow profile by two identical or at least substantially identical half profiles, which are connected to one another as bent half shells, preferably welded.
  • the half profiles each consist of a single copper or aluminum plated steel plate.
  • the bulkhead is preferably also formed from a steel.
  • the steel plates may sandwich the bulkhead or may abut each other directly and be welded together.
  • the bulkhead is welded to the inner peripheral surface of the hollow profile.
  • a Kupferichllmaschine to complete the aluminum or copper outer skin of the support arm. It is also conceivable to dispense completely at the joint of the half-profiles on a completed by welding outer Cu or Al plating.
  • the hollow profile inside completely through the steel material and the hollow profile outside completely by the plating Copper or aluminum form is proposed according to a further preferred embodiment of the present invention.
  • the hollow profile 2 shown in the drawing is usually in the longitudinal direction of the Elektrodentragarms trouble-free and continuously formed from the rear end to a clamping device for clamping the tension bow, in such a way that two cooling channels 4 are formed in the interior of the hollow profile. These cooling channels 4 are circumferentially surrounded by the material of steel plates 6, 8.
  • the steel plate 8 is provided as a flat straight steel sheet in the interior of the hollow section 2 and connects opposing flat outer surfaces of the plated with a plating 10 (in the present case of copper) (plated) steel plates.
  • the provided on the outside of the hollow section 2 plating 10 extends substantially over the entire outer peripheral surface of the hollow section 2. Only in the middle of the hollow section 2, where two hollow section 2 forming curved half-shells 12 from the plated steel plates 6 abut each other and are welded together, 10 copper filler pieces were welded to complete the copper plating.
  • the corners of the hollow profile 2 are round and have an inner radius of curvature R of about 68 millimeters, whereas the wall thickness d of the plated steel plate 6, ie steel plate 6 with plating 20 is about 30 millimeters.

Landscapes

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

Claims (6)

  1. Bras de support d'électrodes pour des fours à arc, avec un logement d'électrodes qui est prévu à son extrémité avant et qui comporte un profilé creux (2) formé par au moins une plaque d'acier (6, 10) plaquée en cuivre ou en aluminium,
    caractérisé en ce que le profilé creux (2) présente des coins arrondis et
    en ce que les plaques d'acier plaquées (6, 10) forment sur leur face intérieure un conduit de refroidissement (4) pour un agent de refroidissement qui refroidit l'extrémité avant du bras de support et qui est dévié dans le bras de support.
  2. Bras d'électrodes selon la revendication 1, caractérisé en ce que les coins arrondis présentent un rapport du rayon de courbure intérieur (R) sur l'épaisseur de paroi (d) de la plaque d'acier plaquée (6, 10) d'au moins 1,25, de préférence de 2,25.
  3. Bras de support d'électrodes selon l'une des revendications précédentes, caractérisé en ce que deux conduits de refroidissement (4) sont formés par une cloison étanche (6) qui traverse le profilé creux.
  4. Bras de support d'électrodes selon l'une des revendications précédentes, caractérisé en ce que le profilé creux (2) est formé par deux demi-profilés (12) identiques composés de plaques en acier plaquées en cuivre ou en aluminium (6, 10).
  5. Bras de support d'électrodes selon la revendication 4, caractérisé en ce que les demi-profilés (12) sont soudés ensemble à la hauteur de la cloison étanche (8).
  6. Bras de support d'électrodes selon l'une des revendications précédentes, caractérisé en ce que la face intérieure du profilé creux est formée entièrement par le matériau en acier, et la face extérieure du profilé creux est formée entièrement par du cuivre ou de l'aluminium plaqué par-dessus.
EP06019487A 2006-09-18 2006-09-18 Support de bras pour four à arc Active EP1901585B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP06019487A EP1901585B1 (fr) 2006-09-18 2006-09-18 Support de bras pour four à arc
DE200620020336 DE202006020336U1 (de) 2006-09-18 2006-09-18 Elektrodenarm für Lichtbogenöfen
US11/857,088 US20080069175A1 (en) 2006-09-18 2007-09-18 Electrode Arm for Arc Furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06019487A EP1901585B1 (fr) 2006-09-18 2006-09-18 Support de bras pour four à arc

Publications (2)

Publication Number Publication Date
EP1901585A1 EP1901585A1 (fr) 2008-03-19
EP1901585B1 true EP1901585B1 (fr) 2012-08-29

Family

ID=37680586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06019487A Active EP1901585B1 (fr) 2006-09-18 2006-09-18 Support de bras pour four à arc

Country Status (2)

Country Link
US (1) US20080069175A1 (fr)
EP (1) EP1901585B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009034407A1 (de) 2009-07-23 2011-02-03 Fuchs Technology Holding Ag Elektrodentragarm mit lokal befestigtem Stromleiter
DE102010052086A1 (de) * 2010-03-10 2011-09-15 Sms Siemag Ag Elektrodentragarmsystem
FR3045269A1 (fr) * 2015-04-01 2017-06-16 Clesid Lorber Bras conducteur en avier amagnetique renforce par un materiau a basse resistivite

Family Cites Families (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
US4682341A (en) 1984-11-29 1987-07-21 Fuchs Systemtechnik Gmbh Electric arc furnace
DE4236158C1 (de) * 1992-10-20 1994-03-17 Mannesmann Ag Elektrodentragarm für Lichtbogenöfen
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

Also Published As

Publication number Publication date
US20080069175A1 (en) 2008-03-20
EP1901585A1 (fr) 2008-03-19

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