EP1901585A1 - Electrode arm for arc furnace - Google Patents
Electrode arm for arc furnace Download PDFInfo
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- EP1901585A1 EP1901585A1 EP06019487A EP06019487A EP1901585A1 EP 1901585 A1 EP1901585 A1 EP 1901585A1 EP 06019487 A EP06019487 A EP 06019487A EP 06019487 A EP06019487 A EP 06019487A EP 1901585 A1 EP1901585 A1 EP 1901585A1
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- Prior art keywords
- support arm
- electrode
- hollow profile
- copper
- electrode support
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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
- H05B7/101—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.
- 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.
- 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, one chamber of which forms a front end of the electrode support arm flow channel and the other chamber forms the cooling channel for the drain 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 welded together with the half-profiles.
- 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.
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft einen Elektrodenarm für Lichtbogenöfen mit einer an seinem vorderen Ende vorgesehenen Elektrodenaufnahme, der ein Hohlprofil aufweist, welches durch wenigstens eine mit Kupfer oder Aluminium plattierte Stahlplatte gebildet ist.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.
Elektrodentragarme für Lichtbogenöfen für die Stahlerzeugung dienen der Halterung von Elektroden, die regelmäßig einen runden Querschnitt haben und aus Graphit gebildet sind. Diese Elektroden werden an einer von dem Elektrodentragarm ausgebildeten Elektrodenaufnahme gehalten. Diese wird regelmäßig durch eine Klemme gebildet, welche die Elektrode umfänglich fasst und damit hält.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.
Ein Elektrodentragarm ist regelmäßig in Längsrichtung der Elektroden höhenbeweglich, um die Eindringtiefe der Elektrode in den Lichtbogenofen zu steuern und damit die Ausbildung des Lichtbogens zu beeinflussen. Hierbei wird besonders auf einen möglichst schonenden Einsatz der Elektroden geachtet. Es kann aber durchaus vorkommen, dass zum Aufschmelzen von Schrott die Elektroden mit einer relativ hohen Geschwindigkeit auf den in dem Lichtbogenofen befindlichen Schrotthaufen auftreffen. Ein Elektrodenarm ist dementsprechend hohen mechanischen Beanspruchungen ausgesetzt und muss eine hinreichende Steifigkeit und Festigkeit haben, soll aber möglichst leicht sein, um eine rasche Änderung der Eindringtiefe zu ermöglichen.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.
Darüber hinaus kommen in Lichtbogenöfen sehr hohe Ströme bei sehr hohen Spannungen zum Einsatz. Dies bringt das Problem mit sich, dass zwischen dem Strom führenden Elektrodenarm und der Umgebung ein elektrischer Überschlag mit Lichtbogen auftreten kann. Darüber hinaus wird der Elektrodentragarm wegen der auch mit der Stromführung einhergehenden thermischen Belastung gekühlt. Zusätzlich zu der Erwärmung des Tragarmes wegen des fließenden Stromes muss darüber hinaus Sorge getragen werden, dass der Elektrodentragarm nicht aufgrund der thermischen Bedingungen in dem Lichtbogenofen unzulässig erwärmt wird. Dementsprechend sind Elektrodentragarme regelmäßig von sich in Längsrichtung des Tragarmes erstreckenden Kühlkanälen durchsetzt. Mit einem entsprechenden Kühlkanal wird Kühlflüssigkeit, regelmäßig Wasser, von dem hinteren Elektrodentragarmes zum vorderen Ende kommuniziert. Dort kühlt die Kühlflüssigkeit üblicherweise die tragarmseitigen Anlageflächen für die Elektrode, die üblicherweise durch eine der Kontur der Elektrode entsprechend ausgebildete Kontaktbacke gebildet sind. Zusätzlich wird ein relativ zu dem Tragarm verschieblicher Spannbügel gekühlt, der an der der Kontaktbacke gegenüberliegenden Seite gegen die Elektrode drückt und diese an dem Elektrodentragarm fixiert. Wegen der Relativbeweglichkeit des Spannbügels wird dieser üblicherweise über flexible Leitungen mit Kühlflüssigkeit versorgt, die entweder von dem Tragarm abgehen und mit den dort ausgebildeten Strömungskanälen kommunizieren oder unter Umgehung der Strömungskanäle in dem Elektrodentragarm mit der Quelle für die Kühlflüssigkeit kommunizieren.In addition, very high currents at very high voltages are used in electric arc furnaces. This entails the problem that an electric arcing may occur between the current-carrying electrode arm and the environment. In addition, the Elektrodentragarm is cooled because of the associated with the current flow thermal load. In addition to heating the support arm due to the flowing current, care must also be taken that the electrode support arm is not heated inadmissibly due to the thermal conditions in the electric arc furnace. Accordingly, 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. There, the cooling liquid usually cools the tragarmseitigen contact surfaces for the electrode, which are usually formed by a contour of the electrode correspondingly formed contact jaw. In addition, 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.
Wegen der hohen Ströme besteht darüber hinaus das Problem, dass aufgrund der Profilierung des Hohlprofiles Spannungsspitzen vermieden werden sollen und der Elektrodentragarm einen möglichst geringen elektrischen Widerstand für den durch den Tragarm hindurch zu leitenden Strom aufweisen soll.Due to the high currents, there is also the problem that due to the profiling of the hollow profile voltage peaks should be avoided and the electrode support arm should have the lowest possible electrical resistance for the current to be conducted through the support arm.
Die vielschichtigen mechanischen, thermischen und elektrischen Anforderungen an den Tragarm haben zu unterschiedlichen Lösungsvorschlägen geführt, die im Stand der Technik nachgewiesen sind.The complex mechanical, thermal and electrical requirements of the support arm have led to different proposals for solutions, which are proven in the prior art.
So ist mit der
Bei einem alternativen Lösungsvorschlag gemäß
Einen demgegenüber gewichtsmäßig reduzierten Tragarm schlägt die
Diese Lösung ist dabei im Hinblick auf die mit der Herstellung verbundenen Kosten nachteilig. Zum anderen kann ein aus Aluminium gebildeter Elektrodentragarm mitunter den mechanischen Belastungen nicht standhalten und verformt sich.This solution is disadvantageous in view of the costs associated with the production. On the other hand, an electrode support arm made of aluminum can sometimes not withstand the mechanical stresses and deforms.
Diesem Mangel hilft ein anderes Konstruktionsprinzip ab, welches aus der
Die Ausbildung von mit Kupfer plattierten Stahlplatten zur Bildung des Hohlprofils stellt danach eine kostspielige und aus Sicht der Qualitätssicherung anspruchsvolle Alternative zu den vorerwähnten Konstruktionsprinzipien dar.The formation of copper clad steel plates to form the hollow profile then represents a costly and demanding quality assurance alternative to the aforementioned design principles.
Der vorliegenden Erfindung liegt das Problem zugrunde, einen den Anforderungen besser gerecht werdenden Elektrodentragarm anzugeben, dessen Hohlprofil eine hinreichende Festigkeit aufweist und Spannungsspitzen im Wesentlichen vermeidet.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.
Zur Lösung dieses Problems wird mit der vorliegenden Erfindung ein Elektrodentragarm mit den Merkmalen von Anspruch 1 angegeben. Dieser bildet den aus der
Der erfindungsgemäße Tragarm ist nicht auf eine spezielle geometrische Gestaltung des Hohlprofils beschränkt. Denkbar sind beispielsweise verschiedene polygonale Formen. Im Hinblick auf eine möglichst biegesteife Ausführung dürfte zwar ein Rechteckprofil mit abgerundeten Ecken zu bevorzugen sein. Ebenso gut kann der Elektrodentragarm jedoch eine polygonale, beispielsweise fünf-, sechs- oder andere vieleckige Querschnittsform haben.The support arm according to the invention is not limited to a specific geometric design of the hollow profile. For example, different polygonal shapes are conceivable. With regard to a design that is as rigid as possible, a rectangular profile with rounded corners may be preferable. However, the electrode support arm may just as well have a polygonal, for example five, six or other polygonal cross-sectional shape.
Es hat sich gezeigt, dass bei Einhaltung des erfindungsgemäßen Verhältnisses von Krümmungsradius an der Ecke zu Wandstärke der plattierten Stahlplatte Spannungsspitzen an den Ecken weitestgehend vermieden werden können. Der vorgeschlagene untere Grenzwert für das erfindungsgemäße Rundheitskriterium ist dadurch begründet, dass die plattierte Stahlplatte an der Ecke gebogen wird und bei stärkeren Radien ein Biegen der Stahlplatten ohne Beeinträchtigung der auf der Außenseite der Stahlplatte vorgesehenen Plattierung nicht möglich ist.It has been shown that, while maintaining the ratio of the radius of curvature according to the invention at the corner to the wall thickness of the plated steel plate, stress peaks at the corners can be largely avoided. The proposed lower limit for the roundness criterion according to the invention is due to the fact that the plated steel plate is bent at the corner and bending of the steel plates is not possible with stronger radii without affecting the plating provided on the outside of the steel plate.
Mit der vorliegenden Erfindung wird ein minimaler Krümmungsradius vorgegeben und es ist nicht ausgeschlossen, dass die abgerundete Ecke einen uneinheitlich gekrümmten Verlauf hat, wobei das Verhältnis für den kleinsten Krümmungsradius der abgerundeten Ecke gilt. Zur fertigungstechnischen Vereinfachung und im Hinblick auf eine möglichst verlustfreie Durchleitung des Stromes ist es indes zu bevorzugen, den Krümmungsradius als gleichmäßigen Radius zwischen zwei benachbarten vorzugsweise ebenen Seitenflächen vorzusehen. Das Verhältnis des inneren Krümmungsradius zur Wandstärke der plattierten Stahlplatte kann vorzugsweise bei wenigstens 2,45, besonders bevorzugt bei wenigstens 2,6 liegen.With the present invention, a minimum radius of curvature is specified and it is not excluded that the rounded corner has a non-uniformly curved course, the ratio for the smallest radius of curvature of the rounded corner applies. For manufacturing simplification and with regard to a possible lossless passage of the stream, however, it is preferable to provide the radius of curvature as a uniform radius between two adjacent preferably flat side surfaces. 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.
In an sich bekannter Weise bildet die wenigstens eine plattierte Stahlplatte innenseitig einen Kühlkanal für das das vordere Ende des Tragarmes kühlendes, in den Tragarm umgeleitetes Kühlmittel aus. Somit ist das Kühlmittel gerade nicht in Kühlleitungen geführt wird, die innerhalb des Materials ausgespart sind, welches das Hohlprofil bildet. Vielmehr wird nach der Weiterbildung des Elektrodentragarmes der von dem Hohlprofil umschlossene Hohlraum zur Ausbildung des wenigstens einen Strömungskanals genutzt. Vorzugsweise hat das Hohlprofil wenigstens ein das Profil durchsetzendes Schott, welches das Hohlprofil in zwei Kammern unterteilt, von denen eine Kammer einen das vordere Ende des Elektrodentragarms versorgenden Strömungskanal und die andere Kammer den Kühlkanal für den Abfluss für das Kühlmittel von dem vorderen Ende bildet. Am Übergang zwischen dem einen und dem anderen Strömungskanal wird das Kühlmittel in dem Hohlprofil umgelenkt.In a manner known per se, 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. Thus, 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. Preferably, the hollow profile has at least one profile passing through the bulkhead, which divides the hollow profile into two chambers, one chamber of which forms a front end of the electrode support arm flow channel and the other chamber forms the cooling channel for the drain 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.
Bei einer einfachen Ausgestaltung bildet das Hohlprofil lediglich zwei Kühlkanäle aus, und zwar durch ein einziges, das Hohlprofil durchsetzendes Schott. Dieses ist vorzugsweise als eine sich in horizontaler Richtung in dem Hohlprofil erstreckende Trennwand ausgeformt und bildet unterhalb den Zulauf für Kühlflüssigkeit zum vorderen Ende des Elektrodentragarms und in der oberen Hälfte den Rücklauf aus.In a simple embodiment, 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.
Mit Rücksicht auf eine möglichst einfache Herstellung wird gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung vorgeschlagen, das Hohlprofil durch zwei identische oder jedenfalls im Wesentlichen identische Halbprofile auszubilden, die als gebogenen Halbschalen miteinander verbunden, vorzugsweise verschweißt sind. Die Halbprofile bestehen jeweils aus einer einzigen mit Kupfer oder Aluminium plattierten Stahlplatte.With a view to simplest possible production, it is proposed according to a further preferred embodiment of the present invention to form 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.
Es führt zu einer weiteren fertigungstechnischen Vereinfachung, wenn das Schott zusammen mit den Halbprofilen verschweißt wird. Das Schott ist vorzugsweise ebenfalls aus einem Stahl gebildet. Die Stahlplatten (ohne Plattierung) können das Schott zwischen sich einschließen oder aber unmittelbar gegeneinander anstoßen und miteinander verschweißt sein. In diesem Fall wird das Schott an der Innenumfangsfläche des Hohlprofiles eingeschweißt. An der Schweißstelle kann dann in an sich bekannter Weise ein Kupferfüllstück zur Vervollständigung der Aluminium- bzw. Kupferaußenhaut des Tragarms angeschweißt werden. Denkbar ist es auch, an der Fügestelle der Halbprofile auf eine durch Schweißen vervollständigte äußere Cu- bzw. Al-Plattierung ganz zu verzichten.It leads to a further manufacturing simplification, if the bulkhead is welded together with the half-profiles. The bulkhead is preferably also formed from a steel. The steel plates (without plating) may sandwich the bulkhead or may abut each other directly and be welded together. In this case, the bulkhead is welded to the inner peripheral surface of the hollow profile. At the weld can then be welded in a conventional manner a Kupferfüllstück 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.
Zur Vermeidung von Korrosion durch in dem Hohlprofil strömendes Kühlmittel und zur bestmöglichen Verteilung des Stromes über dem Umfang des Hohlprofiles wird gemäß einer weiteren bevorzugten Ausgestaltung der vorliegenden Erfindung vorgeschlagen, die Hohlprofil-Innenseite vollumfänglich durch das Stahlmaterial und die Hohlprofil-Außenseite vollumfänglich durch die Plattierung aus Kupfer bzw. Aluminium auszubilden.To avoid corrosion flowing through the hollow profile coolant and the best possible distribution of the current over the circumference of the hollow profile is proposed according to a further preferred embodiment of the present invention, the hollow profile inside completely through the steel material and the hollow profile outside completely by the plating Copper or aluminum form.
Weitere Einzelheiten und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels in Verbindung mit der Zeichnung, die eine Querschnittsansicht durch ein Hohlprofil wiedergibt.Further details and advantages of the present invention will become apparent from the following description of an embodiment in conjunction with the drawing, which shows a cross-sectional view through a hollow profile.
Das in der Zeichnung gezeigte Hohlprofil 2 ist üblicherweise in Längsrichtung des Elektrodentragarms störungsfrei und kontinuierlich von dessen hinteren Ende bis zu einer Spannvorrichtung zum Spannen des Spannbügels ausgebildet, und zwar so, dass im Inneren des Hohlprofils 2 zwei Kühlkanäle 4 ausgebildet sind. Diese Kühlkanäle 4 werden umfänglich durch das Material von Stahlplatten 6, 8 umgeben. Die Stahlplatte 8 ist als ebenes gerades Stahlblech im Innern des Hohlprofils 2 vorgesehen und verbindet einander gegenüberliegende ebene Außenflächen der mit einer Plattierung 10 (vorliegend aus Kupfer) versehenen (plattierten) Stahlplatten.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
Die an der Außenseite des Hohlprofils 2 vorgesehene Plattierung 10 erstreckt sich im Wesentlichen über die gesamte Außenumfangsfläche des Hohlprofils 2. Lediglich in der Mitte des Hohlprofils 2, dort wo zwei das Hohlprofil 2 bildende gebogene Halbschalen 12 aus den plattierten Stahlplatten 6 gegeneinander stoßen und miteinander verschweißt sind, wurden zur Vervollständigung der Kupfer-Plattierung 10 Kupferfüllstücke angeschweißt.The provided on the outside of the hollow section 2
Die Ecken des Hohlprofils 2 sind rund und haben einen inneren Krümmungsradius R von etwa 68 Millimetern, wohingegen die Wandstärke d der plattierten Stahlplatte 6, d. h. Stahlplatte 6 mit Plattierung 20 in etwa 30 Millimeter beträgt.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
- 22
- Hohlprofilhollow profile
- 44
- Kühlkanalcooling channel
- 66
- Stahlplattesteel plate
- 88th
- Stahlplattesteel plate
- 1010
- Plattierungplating
- 1212
- Halbschalehalf shell
- dd
-
Gemeinsame Dicke der Platten 6 und 10Common thickness of
6 and 10plates - RR
- Krümmungsradius an der Ecke des Profils 2Radius of curvature at the corner of the profile 2
Claims (7)
dadurch gekennzeichnet,
dass das Hohlprofil (2) abgerundete Ecken aufweist.Electrode support arm for electric arc furnaces with an electrode holder provided at its front end, which has a hollow profile (2) which is formed by at least one copper or aluminum-plated steel plate (6, 10),
characterized,
that the hollow profile (2) has rounded corners.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE200620020336 DE202006020336U1 (en) | 2006-09-18 | 2006-09-18 | Electrode arm for electric arc furnaces |
EP06019487A EP1901585B1 (en) | 2006-09-18 | 2006-09-18 | Electrode arm for arc furnace |
US11/857,088 US20080069175A1 (en) | 2006-09-18 | 2007-09-18 | Electrode Arm for Arc Furnaces |
Applications Claiming Priority (1)
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EP06019487A EP1901585B1 (en) | 2006-09-18 | 2006-09-18 | Electrode arm for arc furnace |
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EP1901585A1 true EP1901585A1 (en) | 2008-03-19 |
EP1901585B1 EP1901585B1 (en) | 2012-08-29 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011009622A1 (en) | 2009-07-23 | 2011-01-27 | Fuchs Technology Holding Ag | Electrode carrier arm with locally fastened current conductor |
WO2011110522A1 (en) * | 2010-03-10 | 2011-09-15 | Sms Siemag Ag | Electrode support arm system |
FR3045268A1 (en) * | 2015-04-01 | 2017-06-16 | Clesid Lorber | CONDUCTIVE ARM IN AMAGNETIC STEEL REINFORCED BY LOW RESISTIVITY MATERIAL |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0184140A2 (en) | 1984-11-29 | 1986-06-11 | Fuchs Systemtechnik GmbH | Arc furnace |
DE9216411U1 (en) * | 1992-10-20 | 1993-01-28 | Mannesmann AG, 4000 Düsseldorf | Electrode support arm for arc furnaces |
US5471496A (en) * | 1992-10-20 | 1995-11-28 | Mannesmann Aktiengesellschaft | Electrode support device for arc furnaces |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2494775A (en) * | 1946-01-31 | 1950-01-17 | Delaware Engineering Corp | Arc electrode support |
US6377604B1 (en) * | 2000-11-09 | 2002-04-23 | Dixie Arc, Inc. | Current-conducting arm for an electric arc furnace |
-
2006
- 2006-09-18 EP EP06019487A patent/EP1901585B1/en active Active
-
2007
- 2007-09-18 US US11/857,088 patent/US20080069175A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0184140A2 (en) | 1984-11-29 | 1986-06-11 | Fuchs Systemtechnik GmbH | Arc furnace |
DE9216411U1 (en) * | 1992-10-20 | 1993-01-28 | Mannesmann AG, 4000 Düsseldorf | Electrode support arm for arc furnaces |
US5471496A (en) * | 1992-10-20 | 1995-11-28 | Mannesmann Aktiengesellschaft | Electrode support device for arc furnaces |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011009622A1 (en) | 2009-07-23 | 2011-01-27 | Fuchs Technology Holding Ag | Electrode carrier arm with locally fastened current conductor |
DE102009034407A1 (en) | 2009-07-23 | 2011-02-03 | Fuchs Technology Holding Ag | Electrode support arm with locally fixed conductor |
WO2011110522A1 (en) * | 2010-03-10 | 2011-09-15 | Sms Siemag Ag | Electrode support arm system |
CN102870496A (en) * | 2010-03-10 | 2013-01-09 | Sms西马格股份公司 | Electrode support arm system |
CN102870496B (en) * | 2010-03-10 | 2015-11-25 | Sms集团有限责任公司 | Electrode support arm system |
FR3045268A1 (en) * | 2015-04-01 | 2017-06-16 | Clesid Lorber | CONDUCTIVE ARM IN AMAGNETIC STEEL REINFORCED BY LOW RESISTIVITY MATERIAL |
Also Published As
Publication number | Publication date |
---|---|
US20080069175A1 (en) | 2008-03-20 |
EP1901585B1 (en) | 2012-08-29 |
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