EP0533151B1 - Clamping arm for arc furnace electrode - Google Patents

Clamping arm for arc furnace electrode Download PDF

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Publication number
EP0533151B1
EP0533151B1 EP92115902A EP92115902A EP0533151B1 EP 0533151 B1 EP0533151 B1 EP 0533151B1 EP 92115902 A EP92115902 A EP 92115902A EP 92115902 A EP92115902 A EP 92115902A EP 0533151 B1 EP0533151 B1 EP 0533151B1
Authority
EP
European Patent Office
Prior art keywords
electrode
supporting arm
cylinders
contact jaw
contact
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
EP92115902A
Other languages
German (de)
French (fr)
Other versions
EP0533151A1 (en
Inventor
Herbert Dung
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.)
Flohe GmbH and Co
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Flohe GmbH and Co
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Filing date
Publication date
Application filed by Flohe GmbH and Co filed Critical Flohe GmbH and Co
Publication of EP0533151A1 publication Critical patent/EP0533151A1/en
Application granted granted Critical
Publication of EP0533151B1 publication Critical patent/EP0533151B1/en
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 invention relates to an electrode support arm with a contact jaw at its free end for the current transfer to a clamped elongated electrode of an electric furnace.
  • a clamping bracket starting from the electrode support arm is provided for the clamping of the electrode and the associated pressing of the electrode against the contact jaw, which is tightened against the electrode with clamping means embedded in the electrode support arm. Since the mechanism for tensioning the clamping bracket and in particular then the unit required for this, as a rule a hydraulic cylinder, are accommodated in the electrode support arm, the electrode support arm must be dimensioned correspondingly voluminously (DE-A-34 43 574 and US-A-3,444,305). These systems then also prove to be unsuitable for the use of raw electrodes.
  • the object of the invention is to propose a space-saving electrode support arm with an electrode clamp which also permits the use of raw electrodes.
  • contact pieces are inserted with a contact surface adapted to the radius of the electrode and covering a partial area of the electrode circumference, and on the other hand an electrode mount in the form of a torsionally stiff bracket attached laterally to the free end of the electrode support arm, in which on the opposite side of the contact jaw, symmetrically to the longitudinal axis of the support arm, two, at a distance from one another, in the direction of the longitudinal axis of the electrode, located, hydraulically actuated cylinders are embedded, the cylinder of which opposite piston rod, which is oriented in the contact jaw, runs out into a clamping piece that comes into contact with the electrode and fixes the electrode relative to the contact jaw gt.
  • the clamping pieces preferably also have a contact surface adapted to the radius of the electrode.
  • the electrode clamping according to the invention makes it possible to provide electrode support arms with smaller cross sections, which is desirable on site due to the often cramped conditions. If necessary, the free space in the hollow electrode support arm is then also available for other purposes. The adjustment mechanism is less expensive.
  • the cylinders provided according to the invention for clamping the electrode are otherwise easily accessible and can therefore be easily replaced if necessary.
  • the new electrode clamping also opens up the possibility of using raw electrodes, i.e. electrodes whose outer surface has not been machined.
  • the contact jaw 12 is seated at the free end of the electrode support arm 11, in which contact pieces 121, 122 are mounted in an adjustable manner on a radius corresponding to the radius of the electrode 31 and symmetrically to the longitudinal axis 111 of the support arm.
  • An integral part of the support arm 11 is furthermore the torsionally stiff bracket 21 attached to it laterally, in which cylinders 22, 23 are also embedded symmetrically to the support arm longitudinal axis 111, the piston rods 221 of which are oriented towards the center of the bracket 21 and into against the electrode 31 Run out coming clamping pieces 223 with a contact surface adapted to the electrode 31.
  • the cylinder pistons 221 are trapped by a spring assembly 224, which cause the piston 221 to extend and thus cause the clamping pieces 223 to rest against the electrode 31 via the piston rod 222.
  • the annular space 226 of the cylinder is pressurized via the pressure medium line 227, so that the piston retracts against the action of the spring assembly 224 and the clamping piece 223 lifts off the electrode 31.
  • the pressure medium line 227 is guided along the electrode support arm 11 and further to the control station, from where the cylinders 22, 23 are actuated if necessary.

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

Abstract

A torsionally stiff bracket (21), which is placed on the free end of the supporting arm (11) and has cylinders (22, 23) which are supported on the side facing away from the supporting arm (11), can be operated hydraulically, and, in the attached state, fix the electrode (31) with respect to the contact jaw (12) which is placed on the end of the supporting arm (11), is proposed as a clamp for the electrode (31) which is allocated to the electrode supporting arm (11) of an electric furnace, such that it can be replaced. <IMAGE>

Description

Die Erfindung betrifft einen Elektrodentragarm mit einer an seinem freien Ende befindlichen Kontaktbacke für den Stromübergang auf eine eingespannte längliche Elektrode eines Elektroofens.The invention relates to an electrode support arm with a contact jaw at its free end for the current transfer to a clamped elongated electrode of an electric furnace.

Nach dem Stand der Technik wird für die Einspannung der Elektrode und die damit einhergehende Anpressung der Elektrode gegen die Kontaktbacke ein vom Elektrodentragarm ausgehender Spannbügel vorgesehen, der mit in den Elektrodentragarm eingelagerten Spannmitteln gegen die Elektrode angezogen wird. Da der Mechanismus zum Spannen des Spannbügels und insbesondere dann auch das dafür erforderliche Aggregat, in der Regel ein Hydraulikzylinder, im Elektrodentragarm untergebracht sind, muß der Elektrodentragarm dementsprechend voluminös dimensioniert werden (DE-A-34 43 574 und US-A-3,444,305). Diese Systeme erweisen sich dann auch als ungeeignet für den Einsatz von Rohelektroden.According to the state of the art, a clamping bracket starting from the electrode support arm is provided for the clamping of the electrode and the associated pressing of the electrode against the contact jaw, which is tightened against the electrode with clamping means embedded in the electrode support arm. Since the mechanism for tensioning the clamping bracket and in particular then the unit required for this, as a rule a hydraulic cylinder, are accommodated in the electrode support arm, the electrode support arm must be dimensioned correspondingly voluminously (DE-A-34 43 574 and US-A-3,444,305). These systems then also prove to be unsuitable for the use of raw electrodes.

Ausgehend vom im vorausgehenden umrissenen Stand der Technik liegt der Erfindung die Aufgabe zugrunde, einen raumsparenderen Elektrodentragarm mit einer Elektrodeneinspannung vorzuschlagen, die auch den Einsatz von Rohelektroden zuläßt.On the basis of the state of the art outlined above, the object of the invention is to propose a space-saving electrode support arm with an electrode clamp which also permits the use of raw electrodes.

Die Aufgabe wird erfindungsgemäß mit einem Elektrodentragarm gelöst, der entsprechend Patentanspruch 1 ausgebildet ist.The object is achieved with an electrode support arm, which is designed according to claim 1.

Nach der Erfindung sind zum einen in die am freien Ende des Elektrodentragarms angesetzte Kontaktbacke, aus der Kontaktbacke in Richtung auf die Elektrode vorspringend, symmetrisch zur Tragarmlängsachse einstellbeweglich eingelagerte Kontaktstücke mit einer dem Radius der Elektrode angepaßten, einen Teilbereich des Elektrodenumfangs abdeckenden Anlagefläche vorgesehen und zum anderen eine Elektrodeneinfassung in Form eines am freien Ende des Elektrodentragarms seitlich angesetzten verwindungssteifen Bügels, in den an dessen der Kontaktbacke gegenüberliegenden Seite symmetrisch zur Tragarmlängsachse jeweils zwei, in Abstand voneinander, in Richtung der Elektrodenlängsachse gesehen, befindliche, hydraulisch betätigbare Zylinder eingelagert sind, deren auf das jeweils gegenüberliegende, in die Kontaktbacke eingelagerte Kontaktstück orientierte Kolbenstange in ein gegen die Elektrode zur Anlage kommendes Klemmstück ausläuft, das die Elektrode gegenüber der Kontaktbacke festlegt. Vorzugsweise weisen auch die Klemmstücke eine dem Radius der Elektrode angepaßte Anlagefläche auf.According to the invention, on the one hand in the contact jaw attached to the free end of the electrode support arm, projecting out of the contact jaw in the direction of the electrode, symmetrically inserted with respect to the longitudinal axis of the support arm, contact pieces are inserted with a contact surface adapted to the radius of the electrode and covering a partial area of the electrode circumference, and on the other hand an electrode mount in the form of a torsionally stiff bracket attached laterally to the free end of the electrode support arm, in which on the opposite side of the contact jaw, symmetrically to the longitudinal axis of the support arm, two, at a distance from one another, in the direction of the longitudinal axis of the electrode, located, hydraulically actuated cylinders are embedded, the cylinder of which opposite piston rod, which is oriented in the contact jaw, runs out into a clamping piece that comes into contact with the electrode and fixes the electrode relative to the contact jaw gt. The clamping pieces preferably also have a contact surface adapted to the radius of the electrode.

Aus den US-A-3,686,421 und 4,182,927 sind zwar auch schon Elektrodeneinspannungen zu entnehmen, bei denen die Elektrode gegenüber der tragarmseitigen, in diesen Fällen eine durchgängige, dem Radius der Elektrode angepaßte und einen Teilbereich des Elektrodenumfangs abdeckende Kontaktfläche aufweisenden Kontaktbacke mittels einer auf der der Kontaktbacke gegenüberliegenden Seite der Elektrodeneinspannung auf die Elektrode einwirkenden, hydraulisch betätigbaren Spannbacke (eines Klemmschuhs) festgelegt wird. Dabei kann die aus der US-A-3,686,421 bekannte Kontaktbacke zusätzlich auch einstellbeweglich im Elektrodentragarm gelagert sein. Diese Arten der Einspannung ermöglichen allerdings nicht den Einsatz von Rohelektroden, vielmehr ist an die hierbei zum Einsatz kommenden Elektroden eine hohe Maßhaltigkeit in Anlehnung an die Elektrodenaufnahme zwingend erforderlich.From US-A-3,686,421 and 4,182,927 electrode clamps can already be seen, in which the electrode has a contact surface on the support arm side, in these cases a continuous, adapted to the radius of the electrode and covering a partial area of the electrode circumference by means of a contact jaw Contact jaw opposite side of the electrode clamping on the electrode acting, hydraulically actuated clamping jaw (a clamping shoe) is fixed. The contact jaw known from US-A-3,686,421 can also be mounted so that it can be adjusted in the electrode support arm. Allow these types of clamping however, not the use of raw electrodes, rather a high dimensional accuracy based on the electrode holder is absolutely necessary for the electrodes used here.

Wenn auch aus Sicherheitsgründen solchen Spannzylindern der Vorzug zu geben ist, die unter Federdruck anstellen und durch ringraumseitige Druckmittelbeaufschlagung außer Eingriff gebracht werden, schließt das beidseitige druckmittelbeaufschlagbare Zylinder nicht aus. Eine lösbare Einlagerung der die Einspannung der Elektrode bewirkenden Hydraulikzylinder im die Elektrode umgebenden verwindungssteifen Bügel erweist sich als zweckmäßig.Even if, for safety reasons, preference is given to such tension cylinders, which engage under spring pressure and are disengaged by pressurization on the annulus side, the pressurizable cylinder on both sides does not rule out. A detachable embedding of the hydraulic cylinders causing the clamping of the electrode in the torsion-resistant bracket surrounding the electrode proves to be expedient.

Die erfindungsgemäße Elektrodeneinspannung gestattet es, Elektrodentragarme mit geringeren Querschnitten vorzusehen, was aus Gründen der vielfach beengten Verhältnisse vor Ort erwünscht ist. Gegebenenfalls steht der Freiraum im hohlen Elektrodentragarm dann auch für andere Zwecke zur Verfügung. Der Anstellmechanismus ist weniger aufwendig. Die nach der Erfindung vorgesehenen Zylinder zum Einspannen der Elektrode sind im übrigen leicht zugänglich und lassen sich somit im Bedarfsfall leicht auswechseln. Die neue Elektrodeneinspannung eröffnet auch die Möglichkeit des Einsatzes von Rohelektroden, also von Elektroden, deren Mantelfläche nicht bearbeitet ist.The electrode clamping according to the invention makes it possible to provide electrode support arms with smaller cross sections, which is desirable on site due to the often cramped conditions. If necessary, the free space in the hollow electrode support arm is then also available for other purposes. The adjustment mechanism is less expensive. The cylinders provided according to the invention for clamping the electrode are otherwise easily accessible and can therefore be easily replaced if necessary. The new electrode clamping also opens up the possibility of using raw electrodes, i.e. electrodes whose outer surface has not been machined.

In der Zeichnung ist die Erfindung anhand eines Ausführungsbeispieles in schematischer Weise erläutert. Es zeigen:

Fig. 1
den neuen Elektrodentragarm in Draufsicht, einen Teilbereich der Einspannung aufgebrochen,
Fig. 2
den Elektrodentragarm in Fig. 1, die Elektrodeneinfassung aufgeschnitten.
In the drawing, the invention is explained schematically using an exemplary embodiment. Show it:
Fig. 1
top view of the new electrode support arm, a portion of the clamping broken open,
Fig. 2
the electrode support arm in Fig. 1, the electrode bezel cut.

Am freien Ende des Elektrodentragarms 11 sitzt die Kontaktbacke 12 auf, in der auf einem dem Radius der Elektrode 31 entsprechenden Radius symmetrisch zur Tragarmlängsachse 111 Kontaktstücke 121, 122 einstellbeweglich gelagert sind. Integrierter Bestandteil des Tragarms 11 ist des weiteren der seitlich an ihr angesetzte verwindungssteife Bügel 21, in den auch wieder symmetrisch zur Tragarmlängsachse 111 Zylinder 22, 23 eingelagert sind, deren Kolbenstangen 221 auf das Zentrum des Bügels 21 orientiert sind und in gegen die Elektrode 31 zur Anlage kommende Klemmstücke 223 mit einer der Elektrode 31 angepaßten Anlagefläche auslaufen. Die Zylinderkolben 221 sind von einem Federpaket 224 hinterfangen, die das Ausfahren des Kolbens 221 und damit die Anlage der Klemmstücke 223 über die Kolbenstange 222 gegen die Elektrode 31 bewirken. Zum Elektrodenwechsel wird der Ringraum 226 des Zylinders über die Druckmittelleitung 227 mit Druckmittel beaufschlagt, so daß der Kolben gegen die Wirkung des Federpaketes 224 einfährt und das Klemmstück 223 von der Elektrode 31 abhebt. Die Druckmittelleitung 227 ist am Elektrodentragarm 11 entlang und weiter zum Steuerstand geführt, von dort erfolgt im Bedarfsfall die Betätigung der Zylinder 22, 23.The contact jaw 12 is seated at the free end of the electrode support arm 11, in which contact pieces 121, 122 are mounted in an adjustable manner on a radius corresponding to the radius of the electrode 31 and symmetrically to the longitudinal axis 111 of the support arm. An integral part of the support arm 11 is furthermore the torsionally stiff bracket 21 attached to it laterally, in which cylinders 22, 23 are also embedded symmetrically to the support arm longitudinal axis 111, the piston rods 221 of which are oriented towards the center of the bracket 21 and into against the electrode 31 Run out coming clamping pieces 223 with a contact surface adapted to the electrode 31. The cylinder pistons 221 are trapped by a spring assembly 224, which cause the piston 221 to extend and thus cause the clamping pieces 223 to rest against the electrode 31 via the piston rod 222. To change the electrodes, the annular space 226 of the cylinder is pressurized via the pressure medium line 227, so that the piston retracts against the action of the spring assembly 224 and the clamping piece 223 lifts off the electrode 31. The pressure medium line 227 is guided along the electrode support arm 11 and further to the control station, from where the cylinders 22, 23 are actuated if necessary.

Wie aus Figur 2 zu entnehmen ist, sind jeweils zwei Zylinder, z.B. 23, 23′, im Abstand voneinander untereinander vorgesehen. Damit wird die lotrechte Orientierung der eingespannten Elektrode 31 sichergestellt. In Verbindung mit einstellbeweglichen Kontaktstücken, z.B. 122, ergibt sich des weiteren die Möglichkeit des Einsatzes von ungedrehten Elektroden.As can be seen from Figure 2, two cylinders, e.g. 23, 23 ', spaced from each other. This ensures the perpendicular orientation of the clamped electrode 31. In connection with adjustable contact pieces, e.g. 122, there is also the possibility of using non-rotated electrodes.

Claims (5)

  1. Electrode supporting arm (11), having a contact jaw (12) situated at its free end for the transfer of current to a clamped-in, elongate electrode (31) of an electric oven,
    having contact parts (121, 122), which are incorporated in the contact jaw (12) so as to protrude from the contact jaw (12) in a direction towards the electrode (31) and be adjustably displaceable symmetrically relative to the longitudinal axis (111) of the supporting arm, said contact parts having an abutment face, which is adapted to the radius of the electrode (31) and covers a portion of the electrode periphery,
    and having an electrode holder in the form of a distortion-resistant clamp (21), which is attached laterally to the free end of the electrode supporting arm (11) and in which are incorporated two hydraulically actuatable cylinders (22, 22′, 23, 23′), which are spaced apart, when viewed in the direction of the longitudinal axis (311) of the electrode, and are situated on the side of the clamp opposite the contact jaw (12) symmetrically relative to the longitudinal axis (111) of the supporting arm, the piston rod (222) of said cylinders being orientated towards the oppositely situated contact part (121, 122) incorporated in the contact jaw (222) and extending into a clamping part (223), which comes to abut against the electrode (31) and secures the electrode (31) relative to the contact jaw (12).
  2. Electrode supporting arm according to claim 1, characterised in that the clamping parts (223) have an abutment face adapted to the radius of the electrode (31).
  3. Electrode supporting arm according to claim 1 or claim 2, characterised in that the the cylinders (22, 22′, 23, 23′) are chargeable with pressure medium on at both ends.
  4. Electrode supporting arm according to claim 1 or claim 2, characterised in that the cylinders (22, 22′, 23, 23′) extend under resilient pressure and retract when charged with pressure medium at the end facing the annular chamber.
  5. Electrode supporting arm according to one of claims 1 to 4, characterised in that the cylinders (22, 22′, 23, 23′) are detachably incorporated in the clamp (21).
EP92115902A 1991-09-18 1992-09-17 Clamping arm for arc furnace electrode Expired - Lifetime EP0533151B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4131044 1991-09-18
DE4131044A DE4131044A1 (en) 1991-09-18 1991-09-18 COMPONENT OF AN ELECTRODETARM ARM FORMING THE ELECTRODE

Publications (2)

Publication Number Publication Date
EP0533151A1 EP0533151A1 (en) 1993-03-24
EP0533151B1 true EP0533151B1 (en) 1995-06-21

Family

ID=6440894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92115902A Expired - Lifetime EP0533151B1 (en) 1991-09-18 1992-09-17 Clamping arm for arc furnace electrode

Country Status (3)

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EP (1) EP0533151B1 (en)
AT (1) ATE124200T1 (en)
DE (2) DE4131044A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10311426A1 (en) * 2002-12-20 2004-09-23 Arndt Dung Clamping for the interchangeable electrode of an electric melting unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10239470A1 (en) * 2002-08-28 2004-03-11 Arndt Dung Monitoring clamping pressure exerted by actuating cylinder which clamps electrode in electric furnace involves continuously measuring clamping pressure using pressure cell assigned to cylinder
DE10261162B4 (en) * 2002-12-20 2016-03-10 Arndt Dung Clamping for the replaceable electrode of an electrofusion unit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1165783B (en) * 1954-01-11 1964-03-19 Demag Elektrometallurgie Gmbh Electrode holder
DE1263200B (en) * 1954-10-13 1968-03-14 Knapsack Ag Deep socket for electrodes in electric ovens
US3444305A (en) * 1968-06-13 1969-05-13 Alfred H Turner Electrode head for electric furnace electrodes
US3686421A (en) * 1971-08-30 1972-08-22 Edgar Wunsche Unitized electride holder and arm for electric arc furnace electrodes or the like
GB1404661A (en) * 1972-07-07 1975-09-03 British Steel Corp Furnace electrode clamp
US4182927A (en) * 1978-08-04 1980-01-08 Dixie Bronze Company Electrode holders having differential clamping devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10311426A1 (en) * 2002-12-20 2004-09-23 Arndt Dung Clamping for the interchangeable electrode of an electric melting unit
DE10311426B4 (en) * 2002-12-20 2016-06-16 Arndt Dung Clamping for a replaceable electrode of an electrofusion unit

Also Published As

Publication number Publication date
ATE124200T1 (en) 1995-07-15
DE4131044A1 (en) 1993-03-25
EP0533151A1 (en) 1993-03-24
DE59202604D1 (en) 1995-07-27

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