EP4523498A1 - Kupferkontaktbacke sowie verfahren zu ihrer herstellung - Google Patents
Kupferkontaktbacke sowie verfahren zu ihrer herstellungInfo
- Publication number
- EP4523498A1 EP4523498A1 EP23717025.3A EP23717025A EP4523498A1 EP 4523498 A1 EP4523498 A1 EP 4523498A1 EP 23717025 A EP23717025 A EP 23717025A EP 4523498 A1 EP4523498 A1 EP 4523498A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact jaw
- copper contact
- base body
- face
- cooling channels
- 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
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
-
- 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 present invention relates to a copper contact jaw for an electrical melting unit, in particular an electric arc furnace, which can be attached to an electrode support arm of the melting unit and via which an electrode of the melting unit can be electrically conductively connected to the electrode support arm, as well as a method for producing the copper contact jaw according to the invention.
- Such contact jaws made of pure copper are manufactured in such a way that a rolled or forged copper blank is first provided and then mechanically processed by drilling holes for water cooling. Due to the size of a contact jaw, which can, for example, have a length of 750 mm, a width of 600 mm and a thickness of 150 mm, deep hole drilling still represents a technical challenge. For this reason, large drilling diameters of at least 24 mm is used, whereby the holes are typically drilled into the contact jaw via the opposite end faces so that the holes meet in the middle. The two openings can then be closed by welding with a copper plug or using threaded locking screws.
- the material to be welded When welding copper, the material to be welded usually has to be preheated evenly to a temperature of around 600 °C, which is energy and time intensive. Temperatures of greater than 1200 °C then arise at the points to be welded, which lead to local recrystallization of the structure and, as a result, to a loss of the original hardness that the material acquired through the forging or rolling process. Closing with threaded locking screws or similar means can also be used cannot be guaranteed permanently due to the high ambient temperatures in the unit.
- the present invention is based on the object of providing a copper contact jaw that is improved over the prior art for an electrical melting unit, in particular for an electric arc furnace, and a method for producing such a copper contact jaw that is improved over the prior art.
- the object is achieved by a copper contact jaw with the features of patent claim 1 and by a method with the features of patent claim 9.
- the copper contact jaw which can be attached to an electrode support arm of the melting unit and via which an electrode of the melting unit can be electrically conductively connected to the electrode support arm, comprises; a base body with a rear surface, which usually faces an electrode arm, and an oppositely arranged front surface, which usually faces an electrode, a first end face and a second, axially oppositely arranged end face, which in the installed state is then exposed to the melt facing the melting unit, as well as at least a first and a second side surface; two contact surfaces arranged on the front surface of the base body, which are mirror-symmetrical to one another and extend axially along the base body; and a cooling channel system with a coolant inlet opening and a coolant outlet opening and a plurality of cooling channels that extend axially and radially through the base body.
- the method according to the invention for producing a copper contact jaw provides that a forged or rolled one is initially used Copper contact jaw blank is provided, which has a base body with a rear surface and an oppositely arranged front surface, a first end face and a second, axially oppositely arranged end face, at least a first and a second side surface, and two contact surfaces arranged on the front surface of the base body, which are mirror-symmetrical to one another and extend axially along the base body; wherein a coolant inlet opening, a coolant outlet opening and a plurality of cooling channels running axially and radially through the base body are then introduced mechanically, preferably by means of deep hole drilling.
- the cooling channel system which includes a coolant inlet opening, a coolant outlet opening and a plurality of cooling channels that run axially and radially through the base body, achieves improved heat dissipation on the one hand due to the increased number of cooling channels. Furthermore, the cooling channels can be placed closer to the highly stressed contact surfaces due to their much smaller diameter compared to the prior art, whereby the cooling effect of these can be significantly improved. From a manufacturing perspective, the copper contact jaw according to the invention no longer needs to be welded. On the one hand, this ensures that the material does not undergo recrystallization and thus retains the structure set during the forging or rolling process, which means that longer service lives can be guaranteed. On the other hand, there is no need for a second mechanical processing, including set-up time, which also reduces production costs.
- the term “multiplicity of cooling channels” means that the cooling system comprises at least ten, preferably at least twenty, more preferably at least thirty, even more preferably at least forty, and most preferably at least fifty individual cooling channels.
- the plurality of cooling channels are advantageously formed in the base body and fluidly connected to one another in such a way that they can be supplied with a coolant via a single central coolant inlet opening and a single central coolant outlet opening.
- the 1 to 3 large bores of at least 24 mm are replaced by a large number of small deep-hole bores that are fluidly connected to one another.
- the large number of cooling channels can ensure the required amount of cooling water, for example 5000 L/h.
- the large number of cooling channels which are or are formed by a deep hole that is open on one side, allows them to be placed in the copper contact jaw in such a way that the threaded locking screws for closing the openings are not directly exposed to the radiant heat of a melt when the copper contact jaw is in use is.
- each of the cooling channels has a diameter in the range from 4.0 to 16.0 mm, more preferably a diameter in the range from 5.0 to 14.0 mm, even more preferably a diameter in the range from 6.0 to 12.0 mm, and most preferably a diameter in the range of 6.00 to 10.0 mm.
- the diameter of each deep hole and thus of each cooling channel is a diameter of 8.0 mm.
- the plurality of cooling channels are formed from a plurality of cooling channel groups, which each extend axially or radially through the base body of the copper contact jaw.
- each of the plurality of cooling channel groups comprises at least two, preferably at least three, more preferably at least four or more cooling channels.
- each of the plurality of cooling channel groups comprises four cooling channels.
- Fig. 7 shows an embodiment variant of an electrode arm comprising the copper contact jaw.
- FIGs 1a and 1b an embodiment variant of a copper contact jaw 1 according to the invention is shown in two different perspective views.
- the present copper contact jaw 1 consists of pure forged copper (99.98% by weight) and is intended for use in an electrical melting unit, such as an electric arc furnace.
- a melting unit or the electric arc furnace can comprise one or more electrode support arms 2 (see Figure 7), at the distal end of which the copper contact jaw 1 is attached.
- An electrode of the melting unit such as a graphite electrode, is electrically connected to the electrode support arm 2 via the copper contact jaw 1 and a fastening means 3.
- the Electrode (not shown) is fixed in a non-positive manner with the electrode support arm 2 via the fastening means 3.
- the copper contact jaw 1 comprises a base body 4 with a rear surface 5 facing an electrode arm 2 and a front surface 6 arranged opposite the rear surface 5 and then facing the electrode
- the front surface 6 has two contact surfaces 7, 8, each comprising a concave bulge, which extend axially along the base body 4 and are designed to be mirror-symmetrical to one another.
- the front surface 6 can also be formed by a continuous concave surface design. In this case, the two contact surfaces 7, 8 form an integral part of this.
- the base body 4 comprises a first end face 9, a second end face 10 which is arranged axially opposite the first end face 9 and then faces the melt when installed, and two side faces 11a, 11b, 12a, 12b.
- the copper contact jaw 1 comprises a cooling channel system with a coolant inlet opening 13, a coolant outlet opening 14 and a plurality of cooling channels 15 which extend through the base body 4 in the axial and radial directions.
- the coolant inlet opening 13 and the coolant outlet opening 14 are arranged in an upper third, viewed in the axial direction, and thus in an area facing the first end face 9, so that they are not directly exposed to the radiant heat of the melt during use.
- the copper contact jaw 1 each has a single and therefore central coolant inlet opening or coolant outlet opening 13, 14, which are fluidly connected to the plurality of cooling channels 15.
- the multitude of cooling channels 15 are formed from a plurality of individual cooling channel groups 16 to 30, each axially 16, 18, 20, 22, 24, 26, 28, 30 or radially 17, 19, 21, 23, 25 , 27, 29 run through the base body 4 and are therefore arranged alternately with one another.
- Each of the cooling channel groups 16 to 30 in the present case consists of four individual cooling channels 15, each of these individual cooling channels 15 being formed by a separate deep hole which has been drilled into the base body 4 through a corresponding surface 5, 9, 11a, 11b, 12a, 12b is.
- each of the cooling channels 15 is formed by a deep hole that is open on one side and is then closed using threaded locking screws (not shown).
- a coolant, for example water, introduced via the central coolant inlet opening 13 therefore initially flows via the four individual channels 15 of the first group 16 in the direction of the second end face 10 (see arrow 31 in Figure 2).
- the coolant is then fed via the four channels 15 of the second group 17 to the cooling channels 15 of the third group 18 (see arrow 32 in Figure 2), via which it flows through the copper contact jaw 1 in the direction of the first end face 9 (see arrow 33 in Figure 2 ).
- the coolant then reaches the channels 15 of the fifth group 20 via the four channels 15 of the fourth group 19, via which it flows through the copper contact jaw 1 again in the direction of the second end face 10 (see arrows 34, 35 in Figure 4).
- the coolant then flows via the four channels 15 of the sixth group 21, which are arranged centrally in the axial direction and run in the radial direction, into the cooling channels 15 of the seventh group 22, via which it flows towards the copper contact jaw 1 flows through the second end face 9 (see arrow 36 in Figure 5 and arrow 37 in Figure 2).
- the coolant then flows via the adjoining four channels 15 of the eighth group 23 from the left copper contact jaw half shown in FIG to the left copper contact jaw half flows in the opposite direction, as can be seen from the Arrows 39 to 43 in Figures 2, 3 and 5 are shown.
- the copper contact jaw 1 has an axial length of 750 mm, a width of 600 mm and a thickness of 150 mm.
- the individual cooling channels 15 were created using a deep hole drill with a diameter of 8.0 mm, so that a minimum volume flow of 5000 L/h can be achieved across the entire cooling channel system.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Arc Welding In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022204610.2A DE102022204610A1 (de) | 2022-05-11 | 2022-05-11 | Kupferkontaktbacke sowie Verfahren zu ihrer Herstellung |
| PCT/EP2023/057304 WO2023217443A1 (de) | 2022-05-11 | 2023-03-22 | Kupferkontaktbacke sowie verfahren zu ihrer herstellung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4523498A1 true EP4523498A1 (de) | 2025-03-19 |
| EP4523498B1 EP4523498B1 (de) | 2025-08-27 |
Family
ID=86007720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23717025.3A Active EP4523498B1 (de) | 2022-05-11 | 2023-03-22 | Kupferkontaktbacke sowie verfahren zu ihrer herstellung |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20250331076A1 (de) |
| EP (1) | EP4523498B1 (de) |
| CN (1) | CN119213868A (de) |
| DE (1) | DE102022204610A1 (de) |
| ES (1) | ES3055834T3 (de) |
| WO (1) | WO2023217443A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0037679A1 (de) * | 1980-03-28 | 1981-10-14 | Westley Brothers Limited | In Gussstücken eingefasste Kühlungsrohrleitungen |
| US4342878A (en) * | 1980-05-09 | 1982-08-03 | Wilson Welding Company, Inc. | Water-cooled electrode holder |
| DE3443574A1 (de) | 1984-11-29 | 1986-05-28 | Fuchs Systemtechnik GmbH, 7601 Willstätt | Lichtbogenofen |
| DE102004005051A1 (de) | 2004-01-30 | 2005-08-18 | Arndt Dung | Am freien Ende eines Bestandteil eines Elektroofens bildenden Elektrodentragarms auswechselbar angeordnete Kontaktbacke |
| KR200441093Y1 (ko) * | 2007-04-24 | 2008-07-21 | 현대제철 주식회사 | 전기로의 전극봉 홀더 |
| FI125964B (en) * | 2013-08-27 | 2016-04-29 | Outotec Finland Oy | Cooling channel arrangement in electrode system |
-
2022
- 2022-05-11 DE DE102022204610.2A patent/DE102022204610A1/de active Pending
-
2023
- 2023-03-22 CN CN202380039474.4A patent/CN119213868A/zh active Pending
- 2023-03-22 ES ES23717025T patent/ES3055834T3/es active Active
- 2023-03-22 US US18/864,509 patent/US20250331076A1/en active Pending
- 2023-03-22 WO PCT/EP2023/057304 patent/WO2023217443A1/de not_active Ceased
- 2023-03-22 EP EP23717025.3A patent/EP4523498B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN119213868A (zh) | 2024-12-27 |
| ES3055834T3 (en) | 2026-02-16 |
| EP4523498B1 (de) | 2025-08-27 |
| WO2023217443A1 (de) | 2023-11-16 |
| DE102022204610A1 (de) | 2023-11-16 |
| US20250331076A1 (en) | 2025-10-23 |
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