EP3075208A1 - Vorrichtung und verfahren zum nachsetzen einer elektrode für einen metallurgischen ofen - Google Patents
Vorrichtung und verfahren zum nachsetzen einer elektrode für einen metallurgischen ofenInfo
- Publication number
- EP3075208A1 EP3075208A1 EP14805873.8A EP14805873A EP3075208A1 EP 3075208 A1 EP3075208 A1 EP 3075208A1 EP 14805873 A EP14805873 A EP 14805873A EP 3075208 A1 EP3075208 A1 EP 3075208A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- clamping ring
- clamping
- rings
- cylinder
- 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
- H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc
- H05B7/102—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc specially adapted for consumable electrodes
Definitions
- the invention relates to a device for repositioning an electrode of a metallurgical furnace, and to a corresponding method for such repositioning.
- EP 1 484 566 A1 shows a device for repositioning an electrode of a metallurgical furnace according to the preamble of claim 1.
- a lower clamping ring is integrated into an electrode support arm, wherein an upper clamping ring is connected to the lower clamping ring via hydraulic cylinders.
- actuating the hydraulic cylinder a distance of the clamping rings can be adjusted to each other, in conjunction with a repositioning of the electrode.
- the power supply to the electrode is ensured both via the lower clamping ring and via the upper clamping ring.
- the power supply is switched alternately between the two clamping rings, if the other clamping ring for a displacement of the device with respect to the electrode temporarily not clamped or opened with the electrode.
- This switching back and forth of the power supply between the electrodes is expensive control technology.
- the clamping rings which usually also contain contact jaws made of copper for power transmission to the electrode, are susceptible to wear for applying sufficient clamping forces.
- the invention has for its object to provide an apparatus and a method for repositioning an electrode of a metallurgical furnace, with an improved power supply to the electrode with simplified and robust means while ensuring increased reliability is ensured.
- the invention is based on the essential finding that the power supply to the electrode is permanently effected only via one of the two clamping rings, which has a contact jaw designed for this purpose.
- the other of the two clamping rings is permanently de-energized and designed for applying sufficient holding or clamping forces to the electrode.
- the current transfer to the electrode takes place permanently only via the clamping ring which, as explained, is equipped for this purpose with at least one contact jaw.
- a switching back and forth of the power transmission between the two clamping rings is not carried out in the present invention.
- the pressure jaw can be moved by at least one clamping ring cylinder in the opposite direction, ie against the bias of the spring device.
- the clamping ring cylinder is hydraulically actuated.
- self-locking is to be understood in the sense of the present invention in that the pressure jaw is pressed by the bias of the spring means against the electrode when the clamping ring cylinder is not actuated.
- a sufficiently high holding force is applied to the electrode by the pressure jaw, which is matched to the weight of the electrode and accordingly prevents slippage of the electrode or a relative displacement of the electrode with respect to the clamping ring.
- z In case of failure of the clamping ring cylinder, z.
- the pressure jaw clamps the electrode as a result of the pretensioning by the spring device as explained. If the electrode is to be set, then the clamping ring cylinder is moved against the bias of the spring device, so that at least a relative displacement of the electrode with respect to the clamping ring and its pressure jaw is possible. Optionally, it is also possible to move the clamping ring cylinder so far against the bias of the spring device that the pressure jaw is released from the electrode and lifts, which also allows a repositioning of the electrode.
- the clamping ring with the pressure jaw alone has the purpose of applying sufficiently large holding forces in the radial direction to the electrode.
- this clamping ring does not fulfill the function of a power transmission, and therefore is not formed of copper or similar metals. This has an advantageous effect on increased Reliability of the device 1 off, in conjunction with a reduced susceptibility to wear.
- the permanently de-energized clamping ring is formed self-locking, with the just explained operation.
- both clamping rings are self-locking. This increases the safety of the device in case of failure of the hydraulic system.
- the device according to the invention can be used for different types of furnaces, in which case e.g. be connected to a support arm or attached to a furnace platform crossmember. It is advantageous if the clamping ring, which has the contact jaw and is used for power transmission to the electrode, is integrated in the support arm or in the traverse.
- the lower second clamping ring has the contact jaw for power transmission to the electrode and is advantageously integrated in the support arm or in the traverse.
- Electrodes used in electric arc furnaces may be composed of adjacent electrode parts.
- the connection point between the electrode parts thereby represents a sensitive length of the electrode.
- an advantageous development of the invention is that the control device for controlling the lifting cylinder and the two clamping rings program or control technology is set up such that the compensation stroke for Lifting cylinder for moving the first clamping ring relative to the second clamping ring can be adjusted variably and automatically, so that a renewed distortion of the first or second clamping ring around the electrode after reaching the Ausreteshubs exclusively adjacent to the sensitive length of the electrode, but in no case within this longitudinal section.
- FIG. 1 shows a simplified side view of a device according to the invention
- Figure 2 is a longitudinal sectional view of the device along the line A-A of
- Figure 1 is a longitudinal sectional view of the device along the line A-A of
- FIG. 1 according to an alternative embodiment
- Figure 3 is a simplified side view of an inventive
- FIG. 4 shows a simplified illustration of a partial region of an electrode for an electric arc furnace, in interaction with a clamping ring of the restorer device according to the invention
- FIG. 5 shows a simplified side view of a clamping ring of the device according to the invention
- Figure 6, 7 are side views of a portion of an electrode for use with the invention during or after an assembly process for
- Figure 8, 9 are side views of a portion of an electrode for use with the invention according to a further embodiment during or after the assembly process for connecting two to each other electrode parts.
- a Nachsetzvoroplasty invention 1 is shown in a simplified side view, with which an electrode 2 for a (not shown) electric arc furnace adjusted relative to the furnace or can be added in the furnace into it.
- the device 1 comprises an upper first clamping ring 4 and a lower second clamping ring 6.
- the clamping rings 4, 6 are interconnected by lifting cylinder 8 and can by actuating this lifting cylinder 8 in their distance from each other to be adjusted, namely a compensation stroke a.
- the lifting cylinders 8 are designed as hydraulic cylinders and correspondingly connected to a (not shown) hydraulic system.
- the compensation stroke a is shown in FIG. 1 with a maximum size. Accordingly, the compensation stroke a or a distance between the two clamping rings 4, 6 may also be set smaller than shown in FIG. Details regarding a change in the distance between the two clamping rings 4, 6 are explained below in detail.
- the lower second clamping ring 6 is connected to a support arm 9, and preferably integrated into the support arm 9.
- the support arm 9 can be positioned deeper in accordance with the consumption of the electrode in the vertical direction (in Fig. 1 down), usually hydraulically.
- the support arm 9 is a per se known component and is therefore not explained in detail.
- the lower second clamping ring 6 serves to transmit power to the electrode 2.
- the second clamping ring 6 has at least one contact jaw 10, which is in contact with the electrode 2.
- the upper first clamping ring 4 is permanently de-energized and serves to hold or clamp the electrode 2.
- the first clamping ring 4 is provided with at least one pressure jaw 14, as evidenced by the sectional view of FIG. 2.
- the pressure jaw 14 is by a spring means 16, preferably in the form of a spring assembly, radially in the direction of the electrode. 2 biased, so that thereby a sufficient holding or Klennnnkraft is applied to the electrode 2.
- the holding force for the electrode 2 is thus generated by the spring assembly 16.
- the first clamping ring 4 has at least one clamping ring cylinder 18, which is preferably designed as a hydraulic cylinder.
- the clamping ring cylinder 18 in this case has the function to move the pressure jaw 14 against the bias of the spring assembly 16 or to open, thereby the clamping force applied to the electrode 2, suitable for a displacement of the electrode 2 relative to the first clamping ring 4 to reduce or cancel.
- An actuation of the clamping ring cylinder 18 can in this case take place in such a way that either a displacement of the electrode 2 relative to the pressure jaw 14 is possible, or that the pressure jaw 14 lifts completely from the electrode 2 and is not further in contact with the electrode 2.
- the first clamping ring 4 has a total of three clamping ring cylinders 18.
- the clamping ring z. B. four clamping ring cylinders 18 are provided, as shown for example in Fig. 2a. Deviating from this, the number of clamping ring cylinders 18 can also be less than three or more than four.
- FIGS. 2 and 2 a are greatly simplified and are to be understood in particular without a scale.
- the lower second clamping ring 6 may also be equipped with a pressure jaw for holding the electrode, in conjunction with at least one clamping ring cylinder, which cooperates as explained with the pressure jaw.
- a pressure jaw for holding the electrode
- at least one clamping ring cylinder which cooperates as explained with the pressure jaw.
- the pressure jaw and the clamping ring cylinder for the lower second clamping ring 6 are not shown.
- the device 1 comprises a control device 20, by means of which the two clamping rings 4, 6 and the lifting cylinder 8 can be controlled.
- FIG. 3 shows a further embodiment of the device 1.
- the same features are provided with the same reference numerals.
- the lower second clamping ring 6 is integrated in a traverse 22, which is attached via hydraulically actuated regulating cylinder 24 hanging on a furnace platform 26. Accordingly, the second clamping ring 6 and thus the entire apparatus 1 can be moved in the vertical direction by actuation of the regulating cylinders 24, toward or away from a furnace lid (not shown).
- the pressure jaws 14 of the first and second clamping rings 4, 6 are indicated greatly simplified in the illustration of FIG. 3.
- the clamping ring cylinder 18 and the contact jaw 10, which is provided for the lower second clamping ring 6, are not shown in FIG. 3 for the sake of simplicity.
- the electrode string may be of a stanchion type in which the regulating cylinders 24 are supported downwardly on a suitable stand or the like.
- burning off of the electrode 2 is compensated for by being readjusted in the direction of the furnace lid.
- This can in the embodiment of FIG. 1 by a vertical lowering of the support arm 9, and in the embodiment of FIG. 3 by an extension of the regulating cylinder 24, wherein the electrode 2 at least by the upper first clamping ring 4, and optionally also by the second lower clamping ring 6, if this is provided with pressure jaws 14, is held.
- Such adjustment of the electrode 2 by a vertical movement of the support arm 9 or by operating the regulating cylinder 24 is known and therefore not further explained.
- the invention works with respect to a repositioning of the electrode 2 as follows:
- the hydraulic cylinders 8 are actuated and extended, so that the upper first clamping ring 4 is spaced from the lower second clamping ring 6, namely so far until, for example, the maximum compensation stroke a (see Fig. 1) is reached.
- the clamping ring cylinder 18 of the first clamping ring 4 are relieved again, whereby the pressure jaws 14 of the first clamping ring 4 are closed and clamp the electrode 2.
- the clamping ring cylinders 18 of the lower second clamping ring 6 are actuated, so that a relative movement of the electrode 2 with respect to the lower second clamping ring 6 is possible.
- the electrode 2 may be composed of various electrode parts, which are connected to each other at their respective end face. When connecting such electrode parts can be problematic that forms an axial offset at a junction between adjacent electrode parts.
- Fig. 4 is shown schematically greatly simplified an electrode 2 with an axial offset at a junction between adjacent electrode parts. If one of the clamping rings 4, 6 radially clamps the electrode 2 for holding or clamping in the region of the connection point between the electrode parts with a force F, this connection point is subjected to disadvantageous shearing loads. This can lead, especially with long or heavy electrodes, to an immediate or delayed release of damage, or even lead to a rupture of the electrode. A possible electrode break leads to a malfunction and disadvantageous business interruption with corresponding costs.
- the device 1 can have at least one sensor device 28 on the first clamping ring 4 and / or on the second clamping ring 6.
- a sensor device 28 has the purpose of detecting a marking provided on the electrode 2 for a sensitive longitudinal section of the electrode 2, so that the clamping rings or their pressure jaws 14 do not clamp the electrode 2 in this sensitive longitudinal section.
- a sensor device 28 may be provided, which is shown greatly simplified in detail in the side view of Fig. 5.
- three sensor devices 28 may be attached by suitable holders.
- Fig. 5 is a developed view, wherein the three Sensor devices 28 are mounted at a uniform distance from each other on the annular first clamping ring 4.
- the sensor devices 28 are attached to the first clamping ring 4 so that they lie together in a virtual horizontal plane E.
- this plane E is transverse or perpendicular to the longitudinal axis of the electrode 2. It is also possible for more or less than three sensor devices 28 to be attached to the first clamping ring 4, the latter preferably at a uniform distance from each other.
- the sensor devices 28 can also be arranged in the region of an inner peripheral surface of the clamping ring 4.
- a sensor device 28 on the upper first clamping ring 4 is greatly simplified and shown symbolically only in the form of a rectangle.
- the sensor device 28 is connected to the control device 20, with which also the hydraulic components of the device 1 can be controlled.
- the purpose of the sensor device 28 is to detect markings which are provided on the electrode 2. In the illustrations of FIGS. 6 to 9, these markings 30 are shown simplified and explained below.
- the electrode 2 consists in its longitudinal direction of a plurality of electrode parts, which are interconnected at their respective end faces.
- two such electrode parts 2a, 2b are shown before they are connected to each other by means of a screw 32.
- the electrode parts 2a, 2b are each provided with a marking 30, which extends transversely to the longitudinal side of the electrode 2 and may consist of a luminescent ink ribbon or the like, for example.
- Fig. 7 are the Electrode parts 2a, 2b shown in their assembled state.
- the two markings 30 define or mark in the longitudinal direction of the electrode 2 a sensitive length section 21 whose axial length is defined by the screwed connection point between the two electrode parts 2a, 2b.
- FIGS. 8 and 9 show in the same way as FIGS. 6 and 7 two adjacent electrode parts 2 a, 2 b before and after connection at their opposite end faces.
- the markings 30 on the electrode parts 2a, 2b are each formed by an annular groove 30r, which runs transversely to the longitudinal axis of the electrode 2.
- the position of such an annular groove 30r can be detected, for example, by a sensor device in the form of a light sensor which emits radiation in the direction of the electrode 2.
- at least one light sensor, which emits radiation in the direction of the electrode 2 is attached to at least the upper first clamping ring 4.
- the light sensor can align the radiation with an edge region of the electrode 2, so that the radiation passes through the annular groove 30r when the annular groove 30r is located at the level of the light sensor. For this case, it is then detected that the upper clamping ring 4 is within the range of the sensitive length portion 21 of the electrode 2. Otherwise, that is, when the annular groove 30r is not positioned adjacent to the light sensor, the radiation is interrupted by the wall of the electrode 2, which means that the light sensor and thus also the first clamping ring 4 are located at a non-critical portion of the electrode 2 ,
- the design of the marker 30 in the form of said annular groove 30r has the advantage of low cost manufacturability and insensitivity to contamination.
- the embodiment in the form of a luminescent ink ribbon (see also Fig. 6, Fig. 7) also combined with the configuration in the form of the annular groove (see Fig .. 8, Fig. 9) can be.
- the marker 30 may also have magnetic properties that can be detected by a correspondingly adapted sensor device 28.
- the second clamping ring 6 may also be provided with a sensor device 28 which is signal-technically connected to the control device 20 and with a mark 30 on the electrode 2 and so that a sensitive length section 21 of the electrode 2 can be detected. 1 and 3, this is simplified symbolized by a rectangle with the reference symbol "28" above the second clamping ring 6. This ensures that the second clamping ring 6 according to this embodiment does not clamp the electrode 2 in a region of its sensitive longitudinal section 21
- the attachment of at least one sensor device 28 to the second clamping ring 6 can be carried out in the same way as on the first clamping ring 4, so that reference is made to avoid repetition of the above explanation.
- the control device 20 is shown symbolically in the drawing by a rectangle and to that extent only greatly simplified.
- the individual data connections between the control device 20 and the respective sensor devices 28 or hydraulic units 8, 18, 24, which can be read or controlled by the control device 20, are indicated in the drawing by dashed lines 21.
- These data connections 21 can be realized, for example, by cable routes or by radio links.
- clamping or holding the electrode 2 at its connection points or in a respective sensitive longitudinal section 21 through the clamping rings 4, 6 is to be avoided. The following explains how this is realized when repositioning the electrode 2.
- the distance of the first clamping ring 4 to the second clamping ring 6 is increased by an extension of the lifting cylinder 8.
- it is now checked before re-clamping the electrode 2 by means of the pressure jaw 14 of the first clamping ring 4 by evaluating the signals of the sensor devices 28, if the first clamping ring 4 is optionally positioned in the region of a sensitive length portion 21 of the electrode 2.
- a renewed clamping or holding the electrode 2 by the first clamping ring 4 is initiated exclusively for the case that the first clamping ring 4 is not positioned in the region of a sensitive length portion 21 of the electrode 2 after extending the lifting cylinder 8.
- the lifting cylinders 8 are - if possible - either further extended, or vice versa something retracted. In any case, the lifting cylinder 8 are actuated or extended so far that the first clamping ring 4 is not in the range of the sensitive length portion 21 of the electrode 2. Only then is the electrode 2 again clamped by a hiring of the pressure jaw 14.
- the sensitive length portion 21 of the electrode 2 is detected by means of the markings 30, 30r provided thereon by the at least one sensor device 28 in order to prevent the electrode 2 from being clamped in this area by a clamping ring.
- the sensitive longitudinal section 21 of the electrode or the frontal sections of the respective electrode parts are also referred to as an nippling area, which is thus effectively protected against being clamped by a clamping ring and any resulting possible damage.
- the invention is suitable for various forms of electrodes used in electric arc furnaces or in electric reduction furnaces.
- Exemplary electrode types are pre-baked electrodes (eg, graphite or carbon electrodes) or self-baking (Söderberg) electrodes.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Furnace Details (AREA)
- Discharge Heating (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013224552.1A DE102013224552A1 (de) | 2013-11-29 | 2013-11-29 | Vorrichtung und Verfahren zum Nachsetzen einer Elektrode für einen metallurgischen Ofen |
| PCT/EP2014/075944 WO2015079024A1 (de) | 2013-11-29 | 2014-11-28 | Vorrichtung und verfahren zum nachsetzen einer elektrode für einen metallurgischen ofen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3075208A1 true EP3075208A1 (de) | 2016-10-05 |
| EP3075208B1 EP3075208B1 (de) | 2020-11-11 |
Family
ID=52002941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14805873.8A Active EP3075208B1 (de) | 2013-11-29 | 2014-11-28 | Vorrichtung und verfahren zum nachsetzen einer elektrode für einen metallurgischen ofen |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3075208B1 (de) |
| CN (1) | CN105935002B (de) |
| DE (1) | DE102013224552A1 (de) |
| WO (1) | WO2015079024A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20165035A (fi) * | 2016-01-20 | 2017-07-21 | Outotec Finland Oy | Menetelmä valokaariuunin yläelektrodiasetelmakokoonpanon käyttämiseksi ja valokaariuunin yläelektrodiasetelmakokoonpano |
| CN109897969A (zh) * | 2017-12-07 | 2019-06-18 | 天工爱和特钢有限公司 | 一种模具钢用的电渣炉 |
| WO2019233549A1 (de) * | 2018-06-04 | 2019-12-12 | Rheinfelden Carbon Gmbh & Co. Kg | Selbstbackende elektrode |
| DE102019217433A1 (de) * | 2019-11-12 | 2021-05-12 | Sms Group Gmbh | Elektrodenhaltevorrichtung und System zum Nachsetzen einer Elektrode eines metallurigschen Ofens |
| CN111043865B (zh) * | 2019-12-24 | 2022-09-02 | 南京玻璃纤维研究设计院有限公司 | 用于电熔炉生产的电极给进装置 |
| CN119317806A (zh) * | 2023-02-28 | 2025-01-14 | 宁德烯铖科技有限公司 | 石墨化炉及其控制方法、电池生产系统 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2903494A (en) * | 1957-02-23 | 1959-09-08 | Demag Elektrometallurgie Gmbh | Electrode attaching device for electric arc furnaces |
| GB988733A (en) * | 1962-09-27 | 1965-04-07 | Ass Elect Ind | Improvements relating to mounting arrangements for electric furnace electrodes |
| US3589434A (en) * | 1967-11-06 | 1971-06-29 | Otmar Kleinhagauer | Installations for electrically remelting metals |
| DE4342511C2 (de) | 1993-12-08 | 1996-02-08 | Mannesmann Ag | Elektroinduktionsofen mit vertikal bewegbarem Rahmen |
| ES2259852B1 (es) | 2003-06-04 | 2007-10-01 | Bautista Rodriguez Giner | Sistema automatico de alargamiento de electrodos en hornos electricos. |
| US7075966B2 (en) * | 2004-05-20 | 2006-07-11 | Hatch, Ltd. | Electrode column |
| DE102006000737A1 (de) | 2006-01-04 | 2007-07-05 | Sms Demag Ag | Vorrichtung zum Nachsetzen einer Elektrode für einen metallurgischen Ofen |
| ITBG20080017A1 (it) * | 2008-04-01 | 2009-10-02 | Piccardi S R L | Dispositivo per la regolazione del punto di bloccaggio di un elettrodo |
-
2013
- 2013-11-29 DE DE102013224552.1A patent/DE102013224552A1/de not_active Withdrawn
-
2014
- 2014-11-28 WO PCT/EP2014/075944 patent/WO2015079024A1/de not_active Ceased
- 2014-11-28 EP EP14805873.8A patent/EP3075208B1/de active Active
- 2014-11-28 CN CN201480073978.9A patent/CN105935002B/zh not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP3075208B1 (de) | 2020-11-11 |
| CN105935002A (zh) | 2016-09-07 |
| DE102013224552A1 (de) | 2015-06-03 |
| WO2015079024A1 (de) | 2015-06-04 |
| CN105935002B (zh) | 2019-10-22 |
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