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WO2001095672A1 - Procede et dispositif pour remplacer les electrodes dans un contenant metallique fonctionnant electriquement, notamment un four a arc - Google Patents

Procede et dispositif pour remplacer les electrodes dans un contenant metallique fonctionnant electriquement, notamment un four a arc Download PDF

Info

Publication number
WO2001095672A1
WO2001095672A1 PCT/EP2001/006027 EP0106027W WO0195672A1 WO 2001095672 A1 WO2001095672 A1 WO 2001095672A1 EP 0106027 W EP0106027 W EP 0106027W WO 0195672 A1 WO0195672 A1 WO 0195672A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
platform
vessel
electrodes
interchangeable
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.)
Ceased
Application number
PCT/EP2001/006027
Other languages
German (de)
English (en)
Inventor
Guido Grund
Andreas Schüring
Kurt Ogorek
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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 SMS Demag AG filed Critical SMS Demag AG
Priority to DE50102750T priority Critical patent/DE50102750D1/de
Priority to AT01936398T priority patent/ATE270489T1/de
Priority to EP01936398A priority patent/EP1287723B1/fr
Publication of WO2001095672A1 publication Critical patent/WO2001095672A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05B7/109—Feeding arrangements

Definitions

  • the invention relates to a method and a device for changing the electrodes on an electrically operated metallurgical vessel, in particular on an electric arc furnace, by exchanging a unit consisting of contact electrodes arranged on a base plate with electrical connections, coolant and thermocouple connections, for a new unit.
  • Such metallurgical vessels in particular electric arc furnaces or shaft furnaces, are equipped with a metallic electrode attached to the jacket of the vessel bottom, which on one side, e.g. from below, protrudes into the furnace through the bottom of the vessel and is connected to an electrical supply line on the outside and is also cooled from this side.
  • the contact electrodes in the arc furnace are subject to premature wear in relation to the furnace lining. Since the replacement of individual electrode rods requires a relatively large amount of time and work, it has started to replace all electrodes together.
  • a device for changing the electrode unit is known (EP 0 219 650 A1).
  • the known procedure is based on a construction in which the electrodes, including the stamping out, are preassembled on a base plate and are lowered into the furnace bottom from above by means of a crane on an eyelet. After the centering has to be carried out in particular, the remaining annular gap between the electrode unit and the furnace filled with ramming paste.
  • the pre-assembled eyelet is dissolved in the melt with the first melting process.
  • the electrode unit on the base plate is broken out in such a way that hydraulic cylinders are arranged beneath the electrode arrangement on claws, which break it out of the furnace floor via the base plate of the electrode arrangement.
  • the hydraulic cylinders raise the electrodes to such an extent that a crane with appropriate grippers can pull the electrodes upwards.
  • This procedure is disadvantageous in that the furnace bottom is reinserted when the new electrodes are inserted, i.e. must be pounded. Disadvantages of this procedure and of the device itself are primarily the complex work by means of a crane, the inaccurate centering in the furnace floor and the complex and expensive device for breaking out the electrode unit, which must be provided separately on each furnace vessel. The imprecise centering of the electrodes has a not inconsiderable influence on the position of the magnetic fields and the associated deflection of the arc.
  • Another known construction provides (DE 40 26 897 A1) to use a divided electrode which is functionally divided into a wear part to be replaced and a connection part located in the bottom for the electrical current and the coolant supply.
  • This split electrode is connected on the inside by means of clamping screws.
  • the lower part of the electrodes remains in the bottom of the furnace, with the upper wear part being lifted out of the furnace by a crane after loosening the clamping screws.
  • a prerequisite for this type of electrode changing device is the adequate space above the furnace in order to change the spent electrode with a crane. This space is not available in all furnace types. With some arc furnaces, such as the Contiarc type, the electrodes can only be changed downwards due to the space available.
  • This design can also be used, for example, to combine an oven with a preheater system that is subsequently placed next to or on top of the oven. be applied. Due to various attachments, the space above the vessel can be limited in other ovens, so that a downward expansion is advantageous.
  • the invention has for its object to do without the removal of the electrode units by means of a crane upwards and without an assignment of hydraulic cylinders bound to each furnace vessel, to achieve better centering of the electrode unit during installation and to carry out less repair work on the furnace floor after a change to have to.
  • the stated object is achieved according to the invention on the basis of a method in which the used unit, after being released from the bottom of the vessel, is lowered and transported to a positioned change car or a change adapter and in which the new unit transported on a change car or a change adapter is inserted and fastened self-centering into the bottom of the vessel.
  • a crane for changing the anode above the furnace vessel is no longer necessary and a furnace vessel no longer has to be equipped with hydraulic cylinders.
  • the new unit can be centered automatically and it is only necessary to reinsert the lining removed between the refractory lining and the used electrode unit during removal.
  • Self-centering can be achieved in that the change carriage or the change adapter with hydraulic cylinders arranged in pairs is hydraulically connected in the positioned position and the hydraulic pistons are retracted and locked laterally in coupling devices on the side of the vessel bottom area.
  • Another step of the procedure is that a platform connected to the hydraulic cylinders under the base plate of the unit with the Contact electrodes raised and connected to the base plate.
  • the used unit can already be aligned and centered on the change car.
  • connection bolts located between the unit of the contact electrodes and the vessel bottom are released. If necessary, the release can be assisted by hydraulic cylinders.
  • the contact electrode unit is finally brought onto the change carriage by lowering the platform connected to the hydraulic cylinders by the weight of the unit with the contact electrodes via the hydraulic pistons.
  • the device for changing the electrodes in an electrically operated metallurgical vessel solves the task of avoiding a crane, avoiding hydraulic cylinders that are permanently present on each furnace vessel, and better centering the unit to be replaced, by concentrating it under the bottom of the vessel
  • Mobile change car is a platform with paired hydraulic cylinders is raised and lowered and by a piston on each of the piston rods is provided, which is self-centering connected to a counter-coupling on the bottom of the vessel.
  • the change carriage or the change adapter can be used for several furnace vessels, so that only one assembly with hydraulic cylinders is required.
  • the hydraulic cylinders can each be used safely for lifting the platform and lowering the load.
  • the change carriage or the change adapter then represents a compact unit if, according to further features, the platform has paired extension arms, in each of which a hydraulic cylinder is held.
  • a precisely positioned transfer position is also achieved in that the base plate, on which the unit made of contact electrodes rests, has further centering means which, when lowered through the platform of the interchangeable car, engage in the car frame of the interchangeable car. This also precisely determines the position of the platform on the change car itself.
  • the positioning between the base plate and the platform is advantageously precisely determined by providing centering means on the platform of the interchangeable carriage for receiving means corresponding in the base plate of the unit, which form a releasable wedge connection in the closed position.
  • Show it: 1 is a vertical section through the floor area of an electric arc furnace with a change carriage in position for the removal of a used electrode unit
  • Fig. 7 shows the section with the base plate centered on the platform after the installation of the connecting bolts
  • Fig. 8 shows the section with the built-in new unit and the ready-to-go change car.
  • a used electrode unit 3 is cleaned after the furnace travel and after cleaning by means of a cleaning hammer around the electrodes (anode) from the refractory masonry 4 then the electrical connections, coolant and thermocouple connections are disconnected.
  • FIGS. 5 to 8 show the removal of a used unit 3 and FIGS. 5 to 8 the installation of a new unit 3 of electrodes.
  • a change carriage 5 is moved with a device for the electrode exchange on the hut floor level under the vessel 1 (Fig. 1).
  • hydraulic cylinders 6 with piston rods 6a are arranged in pairs, which are in the position with hydraulic connections of the provided four hydraulic cylinders 6 are connected.
  • the hydraulic cylinders 6 are supported in the extension arms 7a of the platform 7 on the change carriage 5.
  • the platform 7 is supported on the change carriage 5.
  • the piston rods 6a are extended and the couplings 8 located at the tips of the piston rods 6a are centered and locked in counter-couplings 1b attached to the vessel bottom 1a (FIG. 2).
  • This is followed by the connection of a plurality of connections 9 arranged distributed over the circumference, for which purpose the platform 7 is centered in corresponding receiving means 10a of a base plate 10 by means of centering means 7b (FIG. 3).
  • the connections 9 can as a wedge, screw, u. Like. Be executed.
  • the base plate 10 is part of the unit 3 with the electrodes. Thereafter, connecting bolts 11 between the vessel bottom 1a and the base plate 10 are loosened (FIG. 4).
  • the platform 7 connected to the hydraulic cylinders 6 can be lowered in a controlled manner by its own weight and the weight of the rest unit 3 with the electrodes via the piston rods 6a.
  • the platform 7 is lowered, it is already centered on the change carriage 5.
  • the clutch 8 on the piston rod 6a are released from the counter clutch 1b and the hydraulic cylinders 6 are retracted. Then the change car 5 is moved away with the used unit 3.
  • the change carriage 5 is positioned centrally under the vessel 1 with a new unit 3 of the electrodes.
  • the piston rods 6a are extended and the coupling 8 on the piston rod 6a is connected to the associated counter-coupling 1b on the vessel bottom 1a and locked (FIG. 6).
  • the base plate 10 and the platform 7 are centered by means of centering means 7b located on the platform 7, which engage in the corresponding receiving means 10a.
  • the centering of the device is automatically effected by its own weight.
  • the base plate 10 is automatically centered on the vessel 1 by the centering means 7b and by the coupling 8 on the piston rods 6a in conjunction with the corresponding receiving means 10a.
  • the electrode 3 is raised into the vessel 1.
  • the electrode 3 is then screwed to the vessel bottom 1 a by means of the connecting bolts 11.
  • the weight of the electrode 3 is transferred to the connection.
  • the four clutches 8 can be separated from the counter clutches 1 b and the four hydraulic pistons are raised.
  • the change car 5 can be extended empty.

Landscapes

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

Abstract

L'invention concerne un procédé pour remplacer les électrodes (3) dans un contenant métallique (1) fonctionnant électriquement, notamment un four à arc. Ce procédé consiste à remplacer une unité constituée d'électrodes de contact placées sur une plaque de base (10) et comportant des connexions électriques, des raccords pour réfrigérants et thermocouples, par une nouvelle unité. Selon l'invention, l'unité usée (3), après avoir été détachée du fond (1a) du contenant est descendue puis évacuée sur un chariot positionné (5) ou sur un adaptateur servant au remplacement. Ensuite, la nouvelle unité (3) amenée sur le chariot (5) ou sur l'adaptateur est introduite par le bas dans le fond (1a) du contenant, en étant centrée automatiquement, pour y être ensuite fixée.
PCT/EP2001/006027 2000-06-03 2001-05-26 Procede et dispositif pour remplacer les electrodes dans un contenant metallique fonctionnant electriquement, notamment un four a arc Ceased WO2001095672A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE50102750T DE50102750D1 (de) 2000-06-03 2001-05-26 Verfahren und einrichtung zum wechseln der elektroden an einem elektrisch betriebenen metallurgischen gefäss, insbesondere an einem lichtbogenofen
AT01936398T ATE270489T1 (de) 2000-06-03 2001-05-26 Verfahren und einrichtung zum wechseln der elektroden an einem elektrisch betriebenen metallurgischen gefäss, insbesondere an einem lichtbogenofen
EP01936398A EP1287723B1 (fr) 2000-06-03 2001-05-26 Procede et dispositif pour remplacer les electrodes dans un contenant metallique fonctionnant electriquement, notamment un four a arc

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10027755.1 2000-06-03
DE10027755A DE10027755A1 (de) 2000-06-03 2000-06-03 Verfahren und Einrichtung zum Wechseln der Elektroden an einem elektrisch betriebenen metallurgischen Gefäß, insbesondere an einem Lichtbogenofen

Publications (1)

Publication Number Publication Date
WO2001095672A1 true WO2001095672A1 (fr) 2001-12-13

Family

ID=7644722

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/006027 Ceased WO2001095672A1 (fr) 2000-06-03 2001-05-26 Procede et dispositif pour remplacer les electrodes dans un contenant metallique fonctionnant electriquement, notamment un four a arc

Country Status (6)

Country Link
EP (1) EP1287723B1 (fr)
AT (1) ATE270489T1 (fr)
DE (2) DE10027755A1 (fr)
EG (1) EG22981A (fr)
TW (1) TW524029B (fr)
WO (1) WO2001095672A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011075003C5 (de) * 2011-04-29 2017-06-01 Primetals Technologies Germany Gmbh Elektroschmelzofen
CN106565073A (zh) * 2016-10-31 2017-04-19 彩虹（合肥）液晶玻璃有限公司 玻璃基板池炉电极推进及池壁砖更换装置
CN106714360B (zh) * 2017-01-10 2020-03-06 中国工程物理研究院材料研究所 一种高温气氛压力烧结炉电极常见绝缘故障的维修方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449258A2 (fr) * 1990-03-28 1991-10-02 Kawasaki Steel Corporation Fond pour fours électriques à courant continu
JPH03279778A (ja) * 1990-03-28 1991-12-10 Kawasaki Steel Corp 直流電気炉の炉底電極交換装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449258A2 (fr) * 1990-03-28 1991-10-02 Kawasaki Steel Corporation Fond pour fours électriques à courant continu
JPH03279778A (ja) * 1990-03-28 1991-12-10 Kawasaki Steel Corp 直流電気炉の炉底電極交換装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 107 (M - 1222) 17 March 1992 (1992-03-17) *

Also Published As

Publication number Publication date
DE50102750D1 (de) 2004-08-05
EG22981A (en) 2003-12-31
TW524029B (en) 2003-03-11
EP1287723A1 (fr) 2003-03-05
ATE270489T1 (de) 2004-07-15
DE10027755A1 (de) 2001-12-06
EP1287723B1 (fr) 2004-06-30

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