EP0511609A1 - Power supply cable for arc furnaces - Google Patents
Power supply cable for arc furnaces Download PDFInfo
- Publication number
- EP0511609A1 EP0511609A1 EP92107136A EP92107136A EP0511609A1 EP 0511609 A1 EP0511609 A1 EP 0511609A1 EP 92107136 A EP92107136 A EP 92107136A EP 92107136 A EP92107136 A EP 92107136A EP 0511609 A1 EP0511609 A1 EP 0511609A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable
- terminal
- tube
- bush
- head
- 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.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
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
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/11—Arrangements for conducting current to the electrode terminals
Definitions
- the present invention relates to a power supply cable for arc furnaces.
- Said cables comprise a plurality of water-cooled plaits which conduct the electric current, are connected to two terminals and are contained in a tube which is made of an elastic material, such as rubber, extending from one of said terminals to the other.
- said rubber tube is clamped at its ends on heads which are comprised within the terminals, so that it cannot perform any movement with respect to said heads, and this fact is the cause of rather unsatisfactory functional situations.
- the aim of the present invention is therefore to provide a power supply cable for arc furnaces which allows to obtain improved functional conditions but maintains great constructive simplicity.
- a power supply cable for arc furnaces which comprises water-cooled current-conductive plaits which are connected to two terminals and are contained in a tube which is made of a rubber-like material extending from one of said terminals to the other, characterized in that said tube is clamped, at at least one terminal, on a bush which is associated with a head of said terminal so that it can rotate.
- the reference numeral 1 generally designates a power supply cable for an arc furnace, which is intended to connect the output of a current transformer 2 to an electrode-carrying arm 3.
- terminal 4 of the cable 1 which is connected to the output of the transformer 2 is of a conventional type
- terminal 5 connected to the electrode-carrying arm 3 is executed according to the invention and is described in detail with reference to figure 1.
- the head generally designated by the reference numeral 6, which comprises a milled portion 6a which has a rectangular cross-section, a cylindrical portion 6b, a first ridge 6c and a second ridge 6d to which the current-conductive plaits, such as 7, converge.
- the reference numeral 8 furthermore designates a tube, made of an elastic material such as rubber, which extends from one to the other of said terminals 4 and 5 of the cable 1 while it is locked on the head of the terminal 4 in a conventional manner, so that it is unable to perform any movement with respect thereto, it is associated with the head 6 of the terminal 5 with the interposition of the bush 9, which is suitable for rotating about the axis of the portion 6b of said head.
- said tube 8 is locked on the outer surface of the bush 9 by means of the clamps 10, 11 and 12 which are arranged at regions delimited by the circumferential ridges provided on said surface.
- the reference numeral 15 designates a non-magnetic steel ring which is inserted between the brass bush 9 and the ridge 6c of the head 6, which is made of copper, in order to protect the surfaces of said elements against excessively rapid wear.
- the tube 8 is thus not subjected to torsion, as occurs in known cables, and this leads to greater durability of said tube and to a reduction of the stresses induced in the structures of the furnace; possible negative effects of the torsion of the tube 8 on the assembly of the electric power-conductive plaits are also eliminated.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Connector Housings Or Holding Contact Members (AREA)
Abstract
The power supply cable for arc furnaces comprises water-cooled current-conductive plaits which are connected to two terminals and are contained in a tube which is made of a rubber-like material extending from one of the terminals to the other; the tube is clamped, at at least one terminal, on a bush which is associated with a head of the terminal so that it can rotate.
Description
- The present invention relates to a power supply cable for arc furnaces.
- It is known that the supply of electric power to arc furnaces, which are used particularly for the production of steel and of ferrous alloys, is performed by means of appropriately designed cables which connect a transformer to electrode-bearing arms located at the cover of said furnaces and arrange themselves in a sagging configuration due to their own weight.
- Said cables comprise a plurality of water-cooled plaits which conduct the electric current, are connected to two terminals and are contained in a tube which is made of an elastic material, such as rubber, extending from one of said terminals to the other.
- In the known art, said rubber tube is clamped at its ends on heads which are comprised within the terminals, so that it cannot perform any movement with respect to said heads, and this fact is the cause of rather unsatisfactory functional situations.
- It is in fact known that when the cover of the furnace is opened, the electrode-bearing arms rotate about a vertical axis which causes a rotation of the terminal of the cable which is connected thereto, whereas the terminal of the cable which is connected to the transformer remains fixed; this leads to a torsion of the cable with all of its components, i.e. with the current-conductive plaits and with the rubber covering tube, which is unfavorable both as regards the strength of said tube and as regards the force to which the structures of the furnace are subjected.
- The aim of the present invention is therefore to provide a power supply cable for arc furnaces which allows to obtain improved functional conditions but maintains great constructive simplicity.
- The proposed aim is achieved by a power supply cable for arc furnaces, according to the invention, which comprises water-cooled current-conductive plaits which are connected to two terminals and are contained in a tube which is made of a rubber-like material extending from one of said terminals to the other, characterized in that said tube is clamped, at at least one terminal, on a bush which is associated with a head of said terminal so that it can rotate.
- Further characteristics and advantages will become apparent from the description of a power supply cable for arc furnaces, illustrated only by way of non-limitative example in the accompanying drawings, wherein:
- figure 1 is a view of a terminal of a cable according to the invention, shown partially in cross-section with the locking straps not yet tightened and partially in a side view with said straps tightened;
- figure 2 is a schematic view of a cable according to the invention during use in two different positions, one indicated in solid lines and the other one indicated by dot-and-dash lines.
- With reference to the above figures, the reference numeral 1 generally designates a power supply cable for an arc furnace, which is intended to connect the output of a
current transformer 2 to an electrode-carrying arm 3. - While the
terminal 4 of the cable 1 which is connected to the output of thetransformer 2 is of a conventional type, theterminal 5 connected to the electrode-carrying arm 3 is executed according to the invention and is described in detail with reference to figure 1. - Within said terminal, is thus noted the presence of the head, generally designated by the
reference numeral 6, which comprises a milled portion 6a which has a rectangular cross-section, a cylindrical portion 6b, a first ridge 6c and a second ridge 6d to which the current-conductive plaits, such as 7, converge. - The
reference numeral 8 furthermore designates a tube, made of an elastic material such as rubber, which extends from one to the other of saidterminals terminal 4 in a conventional manner, so that it is unable to perform any movement with respect thereto, it is associated with thehead 6 of theterminal 5 with the interposition of the bush 9, which is suitable for rotating about the axis of the portion 6b of said head. - More precisely, said
tube 8 is locked on the outer surface of the bush 9 by means of theclamps - Seats for containing the
gaskets 13 for providing a seal against the water for the cooling of the current-conductive plaits are provided at the inner surface of the bush 9; in a known manner, by means of ducts not shown in the figure, said water reaches thespace portion 14 delimited by the ridges 6c and 6d of the head and by thetube 8. - Finally, the
reference numeral 15 designates a non-magnetic steel ring which is inserted between the brass bush 9 and the ridge 6c of thehead 6, which is made of copper, in order to protect the surfaces of said elements against excessively rapid wear. - From what has been described it is evident that the functional condition which the invention allows to provide is optimum: in fact, when the electrode-carrying arm 3 rotates upon the opening of the furnace cover, moving the cable 1 from the position shown in solid lines in figure 2 to the position shown in dot-and-dash lines, the head of the
terminal 5 performs the rotation about its own axis shown in said figure 2, producing torsion of the assembly of the electric power-conductive plaits but not of thetube 8, since a relative rotation, allowed by the bush 9, occurs between said tube and said head. - The
tube 8 is thus not subjected to torsion, as occurs in known cables, and this leads to greater durability of said tube and to a reduction of the stresses induced in the structures of the furnace; possible negative effects of the torsion of thetube 8 on the assembly of the electric power-conductive plaits are also eliminated. - In the practical execution of the invention, all the details may be replaced with other technically equivalent elements; the materials employed, as well as the shapes and dimensions, may furthermore be any.
- Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.
Claims (3)
- Power supply cable for arc furnaces, comprising water-cooled current-conductive plaits which are connected to two terminals and are contained in a tube which is made of a rubber-like material and extends from one of said terminals to the other, characterized in that said tube is clamped, at at least one terminal, on a bush which is associated with a head of said terminal so that it can rotate.
- Cable according to claim 1, characterized in that said bush has, at its inner surface which is intended for contact with the head of the cable terminal, seats for containing gaskets for providing a seal against the water for the cooling of said cable, and is provided, at its outer surface, with circumferential ridges which are suitable for delimiting regions at which said tube is suitable for being secured by means of locking clamps.
- Cable according to one or more of the preceding claims, characterized by the presence of a ring made of non-magnetic steel interposed between the surface of the bush which is directed toward the cable and a ridge of the head of the terminal of said cable with which said bush is associated.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMN910014U | 1991-04-29 | ||
IT91MN000014U IT225350Y1 (en) | 1991-04-29 | 1991-04-29 | POWER CORD FOR ARC OVENS |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0511609A1 true EP0511609A1 (en) | 1992-11-04 |
Family
ID=11384282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92107136A Withdrawn EP0511609A1 (en) | 1991-04-29 | 1992-04-27 | Power supply cable for arc furnaces |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0511609A1 (en) |
IT (1) | IT225350Y1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3002534A1 (en) * | 2014-10-02 | 2016-04-06 | ALD Vacuum Technologies GmbH | Remelting furnace comprising a weighing cell |
CN105811130A (en) * | 2016-05-23 | 2016-07-27 | 苏州宝联重工股份有限公司 | Water-cooled cable connector and short-network structure employing same |
DE102017130637B3 (en) * | 2017-12-20 | 2018-11-08 | Arndt Dung | High-current cable for the electrically conductive contacting of an electrode support arm of an electrically operated furnace |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2353364A1 (en) * | 1973-10-25 | 1975-05-07 | Kabel Metallwerke Ghh | Liquid cooled high-current cable for arc furnaces - has flexible connections for inner and outer coolant channels |
DE2357674A1 (en) * | 1973-11-19 | 1975-05-22 | Daniel J Goodman | Water-cooled electric furnace cable - has strain-removing, flexible riser tube between transformer and furnace on latter tilting |
US3917898A (en) * | 1971-10-22 | 1975-11-04 | Showa Electric Wire & Cable Co | Water-cooled cable |
US3983310A (en) * | 1975-04-21 | 1976-09-28 | Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft | Connection between a socket and a liquid cooled cable |
EP0408476A2 (en) * | 1989-07-13 | 1991-01-16 | Erico France S.A.R.L. | Power-supply cable with internal fluid cooling |
-
1991
- 1991-04-29 IT IT91MN000014U patent/IT225350Y1/en active IP Right Grant
-
1992
- 1992-04-27 EP EP92107136A patent/EP0511609A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3917898A (en) * | 1971-10-22 | 1975-11-04 | Showa Electric Wire & Cable Co | Water-cooled cable |
DE2353364A1 (en) * | 1973-10-25 | 1975-05-07 | Kabel Metallwerke Ghh | Liquid cooled high-current cable for arc furnaces - has flexible connections for inner and outer coolant channels |
DE2357674A1 (en) * | 1973-11-19 | 1975-05-22 | Daniel J Goodman | Water-cooled electric furnace cable - has strain-removing, flexible riser tube between transformer and furnace on latter tilting |
US3983310A (en) * | 1975-04-21 | 1976-09-28 | Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft | Connection between a socket and a liquid cooled cable |
EP0408476A2 (en) * | 1989-07-13 | 1991-01-16 | Erico France S.A.R.L. | Power-supply cable with internal fluid cooling |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3002534A1 (en) * | 2014-10-02 | 2016-04-06 | ALD Vacuum Technologies GmbH | Remelting furnace comprising a weighing cell |
CN105811130A (en) * | 2016-05-23 | 2016-07-27 | 苏州宝联重工股份有限公司 | Water-cooled cable connector and short-network structure employing same |
DE102017130637B3 (en) * | 2017-12-20 | 2018-11-08 | Arndt Dung | High-current cable for the electrically conductive contacting of an electrode support arm of an electrically operated furnace |
EP3503683A1 (en) * | 2017-12-20 | 2019-06-26 | Arndt Dung | High power cable for electrically conductive contacting of an electrode arm of an electrically operated furnace |
Also Published As
Publication number | Publication date |
---|---|
ITMN910014V0 (en) | 1991-04-29 |
ITMN910014U1 (en) | 1992-10-29 |
IT225350Y1 (en) | 1996-11-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT |
|
17P | Request for examination filed |
Effective date: 19930325 |
|
17Q | First examination report despatched |
Effective date: 19940110 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19950731 |