EP0219650A1 - Disposition d'électrodes de contact pour fours à arc à courant continu ou fours de fusion à résistance - Google Patents
Disposition d'électrodes de contact pour fours à arc à courant continu ou fours de fusion à résistance Download PDFInfo
- Publication number
- EP0219650A1 EP0219650A1 EP86111685A EP86111685A EP0219650A1 EP 0219650 A1 EP0219650 A1 EP 0219650A1 EP 86111685 A EP86111685 A EP 86111685A EP 86111685 A EP86111685 A EP 86111685A EP 0219650 A1 EP0219650 A1 EP 0219650A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact electrode
- furnace
- electrode assembly
- contact
- arc
- 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.)
- Granted
Links
Images
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
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
-
- 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
- H05B7/06—Electrodes
Definitions
- the invention relates to a direct-current arc or resistance melting furnace, in particular an exchangeable contact electrode arrangement, the contact electrode consisting of a metallic support plate, furthermore a metal base plate arranged at a distance therefrom and connected to the support plate by means of bolts, one or more metallic contact rods, which are attached with their necks to the base plate, a refractory stamping out between the upper edge of the contact rods and the support plate and power and coolant lines arranged below the base plate.
- an arc furnace as a direct current furnace with a cathodically polarized graphite electrode and an anodically polarized contact electrode in the furnace base also has the advantage of significantly reduced graphite electrode consumption. Another advantage is the significantly lower noise level.
- the structure and mode of operation of direct current arc furnaces are known from numerous publications.
- the component that is essential for practical furnace operation is the contact electrode in the furnace vessel, which on the one hand must ensure good electrical contact with the scrap used or in the later course of the melting process with the liquid metal, but on the other hand is exposed to high thermal loads.
- Such a contact electrode is known from DE-PS 3l O6 74l.
- the contact electrodes in the DC arc furnace are subject to premature wear in relation to the furnace hearth lining. Since the replacement of individual contact rods means a relatively large amount of work, in practice it has been decided to replace all the contact rods together at appropriate intervals.
- This mode of operation has the defect that the insertion of the contact rods, the tamping of the center of the furnace floor and the subsequent drying process of the ramming mass delay the restart of the furnace. Furthermore, tamping the center of the furnace floor inside the hot furnace is difficult for the personnel.
- the object of the invention is to improve the contact electrode arrangement, as proposed according to DE-PS 3l O6 74l, in the direction of simpler and faster production, assembly and disassembly.
- the contact electrode arrangement is therefore designed and manufactured as a complete component of the melting furnace.
- This component is inserted into the furnace vessel with a circular opening on the bottom by means of a crane.
- suspension elements eyelets
- the assembly is lowered into the furnace vessel and sits on the ring-shaped stiffening in the furnace vessel with its support plate.
- the base plate to which the power and coolant lines are connected hangs down through the furnace opening.
- the suspension means mentioned on the top of the contact electrode assembly have done their job after lowering and placing the assembly on the bottom of the furnace vessel and melt during operation of the furnace.
- the pressure elements telescopic cylinder
- the contact electrode is first broken out of the pounding compound with a large compressive force and then pushed upwards so far that the gripper of a traction means located above the open furnace vessel can grip around the contact electrode and pull it up out of the furnace.
- the replacement of the contact electrode assembly can also be carried out in such a way that, after the last batch, a residual melt is left on the hearth of the furnace and suitable eyelets are inserted into this melt puts. These eyelets get their hold after the melt has cooled. Now that the contact electrode has only been broken out of the composite in the furnace vessel with the help of the pressure elements (telescopic cylinder), the support eyelets have sufficient hold in the residual melt located above the contact electrode, so that the contact electrode, which has already been released from the furnace vessel, can be lifted up without difficulty by a traction device can be pulled out. Subsequently, the insertion of a new contact electrode assembly can take place in the manner already described.
- the furnace vessel of a direct current arc furnace shown in the figures has a steel jacket 1 and a steel vessel base 7.
- the furnace vessel is provided with a refractory lining 2.
- the contact electrode is inserted as a compact structural unit in the annular bottom recess of the furnace vessel.
- the contact electrode assembly is completely created outside the furnace.
- the structural unit consists of a support plate 3, a base plate 4 arranged at a distance below it and connected to the support plate 3 by means of bolts 5.
- the space l3 of the contact electrode from the upper edge of the contact rods 6 to the support plate 3 is stamped out in such a way that a template is arranged around the contact electrode, which is removed again after the stamping out has solidified.
- the upper side of the contact electrode assembly has at least one suspension element (lifting eye), against which the hook of the traction mechanism is attached, with which the entire contact electrode assembly is lowered into the furnace vessel from above.
- the contact electrode is placed with its support plate 3 on the edge of the annular bottom recess and connected to the furnace vessel by suitable means.
- the annular gap 11 between the construction used and the refractory lining 2 of the furnace vessel 1 is stamped out with refractory material.
- the suspension means (lifting eyes), not shown, melt during the first furnace operation.
- the exchange of the used contact electrode takes place in such a way that after the furnace has been emptied, the pressure elements (telescopic cylinder 10) located on the cantilever claws 9 of the annular stiffening 8 extending below the furnace vessel are extended and the complete contact electrode assembly is removed from the stamping compound is broken out with the furnace vessel. As soon as the break-out has taken place, the telescopic cylinders 10 can be extended further so that the contact electrode emerges from the hearth of the furnace vessel to such an extent that it can be gripped and pulled out by the gripper of a crane (not shown) located above the open furnace.
- An alternative to replacing the contact electrode assembly provides that a residual melt 17 is left in the hearth floor after the last batch of the furnace. At least one support eyelet l4 is let into this residual melt l7, to which, after the residual melt l7 has cooled, a traction means is struck, which pulls the contact electrode assembly upward out of the furnace vessel after the contact electrode has previously been arranged with the aid of the pressure elements lO (below the furnace vessel ( Telescopic cylinder) has been broken out of the association with the furnace vessel by raising the telescopic cylinder.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
- Discharge Heating (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86111685T ATE62577T1 (de) | 1985-10-05 | 1986-08-22 | Kontaktelektroden-anordnung fuer gleichstromlichtbogen oder widerstands-schmelzoefen. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3535692 | 1985-10-05 | ||
DE19853535692 DE3535692A1 (de) | 1985-10-05 | 1985-10-05 | Kontaktelektroden-anordnung fuer gleichstrom-lichtbogen- oder widerstands-schmelzoefen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0219650A1 true EP0219650A1 (fr) | 1987-04-29 |
EP0219650B1 EP0219650B1 (fr) | 1991-04-10 |
Family
ID=6282922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86111685A Expired - Lifetime EP0219650B1 (fr) | 1985-10-05 | 1986-08-22 | Disposition d'électrodes de contact pour fours à arc à courant continu ou fours de fusion à résistance |
Country Status (5)
Country | Link |
---|---|
US (1) | US4700355A (fr) |
EP (1) | EP0219650B1 (fr) |
JP (1) | JPS6282694A (fr) |
AT (1) | ATE62577T1 (fr) |
DE (2) | DE3535692A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4222854A1 (de) * | 1992-07-11 | 1994-01-13 | Gutehoffnungshuette Man | Bodenelektrode für Gleichstrom-Lichtbogenöfen |
US5371759A (en) * | 1991-09-12 | 1994-12-06 | Kortec Ag | D.C. furnace with a hearth electrode, hearth electrode and electrode block, as well as process for operating said furnace |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01128392A (ja) * | 1987-11-12 | 1989-05-22 | Nkk Corp | 直流式電気炉の電極ブロック |
JPH0624157Y2 (ja) * | 1988-07-01 | 1994-06-22 | 日本鋼管株式会社 | 直流電気炉の炉底電極 |
DE4022720A1 (de) * | 1990-07-17 | 1992-01-23 | Flohe Gmbh & Co | Untergefaess eines gleichstromlichtbogenofens |
US5280495A (en) * | 1992-02-14 | 1994-01-18 | Ajax Magnethermic Corporation | Furnace refractory extraction system and method |
DE19921287A1 (de) * | 1999-05-07 | 2000-11-16 | Sms Demag Ag | Gleichstromofen |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR393740A (fr) * | 1907-11-04 | 1908-12-31 | Charles Albert Keller | Système de sole conductrice pour tours électriques |
FR1557843A (fr) * | 1967-01-02 | 1969-02-21 | ||
GB2055028A (en) * | 1979-06-26 | 1981-02-18 | Asea Ab | Hearth connection for a d c arc furnace |
EP0133925A1 (fr) * | 1983-07-28 | 1985-03-13 | BBC Aktiengesellschaft Brown, Boveri & Cie. | Electrode de fond pour un four à arc à courant continu |
EP0133931A1 (fr) * | 1983-07-28 | 1985-03-13 | BBC Brown Boveri AG | Dispositif de refroidissement d'une électrode de fond d'un four à arc à courant continu |
EP0156126A2 (fr) * | 1984-03-14 | 1985-10-02 | MAN Gutehoffnungshütte Aktiengesellschaft | Sole, en particulier pour four à arc à courant continu |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3717713A (en) * | 1971-02-18 | 1973-02-20 | M Schlienger | Arc furnace crucible |
SU617481A1 (ru) * | 1975-09-08 | 1978-07-30 | Предприятие П/Я Г-4361 | Тигель дл гарниссажной печи |
SE415394B (sv) * | 1978-12-29 | 1980-09-29 | Asea Ab | Bottenkontakt vid likstromsljusbagsugn |
DE3106741C2 (de) * | 1981-02-24 | 1983-06-16 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 4200 Oberhausen | Kontaktelektroden-Anordnung für Lichtbogen- oder Widerstandsschmelzofen |
JPS5927078A (ja) * | 1982-08-07 | 1984-02-13 | 海野 延夫 | 戸当り |
DE3466919D1 (en) * | 1983-03-31 | 1987-11-26 | Italimpianti | Improved conductive bottom for direct current electric arc furnaces |
DE3463568D1 (en) * | 1983-07-28 | 1987-06-11 | Bbc Brown Boveri & Cie | Bottom electrode for a direct current arc furnace |
-
1985
- 1985-10-05 DE DE19853535692 patent/DE3535692A1/de not_active Withdrawn
-
1986
- 1986-08-22 DE DE8686111685T patent/DE3678666D1/de not_active Expired - Lifetime
- 1986-08-22 EP EP86111685A patent/EP0219650B1/fr not_active Expired - Lifetime
- 1986-08-22 AT AT86111685T patent/ATE62577T1/de not_active IP Right Cessation
- 1986-09-19 JP JP61219929A patent/JPS6282694A/ja active Granted
- 1986-10-03 US US06/915,224 patent/US4700355A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR393740A (fr) * | 1907-11-04 | 1908-12-31 | Charles Albert Keller | Système de sole conductrice pour tours électriques |
FR1557843A (fr) * | 1967-01-02 | 1969-02-21 | ||
GB2055028A (en) * | 1979-06-26 | 1981-02-18 | Asea Ab | Hearth connection for a d c arc furnace |
EP0133925A1 (fr) * | 1983-07-28 | 1985-03-13 | BBC Aktiengesellschaft Brown, Boveri & Cie. | Electrode de fond pour un four à arc à courant continu |
EP0133931A1 (fr) * | 1983-07-28 | 1985-03-13 | BBC Brown Boveri AG | Dispositif de refroidissement d'une électrode de fond d'un four à arc à courant continu |
EP0156126A2 (fr) * | 1984-03-14 | 1985-10-02 | MAN Gutehoffnungshütte Aktiengesellschaft | Sole, en particulier pour four à arc à courant continu |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5371759A (en) * | 1991-09-12 | 1994-12-06 | Kortec Ag | D.C. furnace with a hearth electrode, hearth electrode and electrode block, as well as process for operating said furnace |
DE4222854A1 (de) * | 1992-07-11 | 1994-01-13 | Gutehoffnungshuette Man | Bodenelektrode für Gleichstrom-Lichtbogenöfen |
Also Published As
Publication number | Publication date |
---|---|
DE3535692A1 (de) | 1987-04-09 |
DE3678666D1 (de) | 1991-05-16 |
JPH0464155B2 (fr) | 1992-10-14 |
US4700355A (en) | 1987-10-13 |
EP0219650B1 (fr) | 1991-04-10 |
JPS6282694A (ja) | 1987-04-16 |
ATE62577T1 (de) | 1991-04-15 |
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