EP3586569B1 - Elektrodengleitvorrichtung - Google Patents

Elektrodengleitvorrichtung Download PDF

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Publication number
EP3586569B1
EP3586569B1 EP17897433.3A EP17897433A EP3586569B1 EP 3586569 B1 EP3586569 B1 EP 3586569B1 EP 17897433 A EP17897433 A EP 17897433A EP 3586569 B1 EP3586569 B1 EP 3586569B1
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EP
European Patent Office
Prior art keywords
electrode
clamping
tension bar
plunger
holder ring
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.)
Active
Application number
EP17897433.3A
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English (en)
French (fr)
Other versions
EP3586569A4 (de
EP3586569A1 (de
Inventor
Jarmo JOKINEN
Seppo JUVONEN
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.)
Metso Finland Oy
Original Assignee
Metso Outotec Finland Oy
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 Metso Outotec Finland Oy filed Critical Metso Outotec Finland Oy
Priority to PL17897433T priority Critical patent/PL3586569T3/pl
Publication of EP3586569A1 publication Critical patent/EP3586569A1/de
Publication of EP3586569A4 publication Critical patent/EP3586569A4/de
Application granted granted Critical
Publication of EP3586569B1 publication Critical patent/EP3586569B1/de
Active legal-status Critical Current
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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
    • H05B7/107—Mountings, supports, terminals or arrangements for feeding or guiding electrodes specially adapted for self-baking 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
    • H05B7/109—Feeding arrangements

Definitions

  • the present invention relates to an electrode slipping device.
  • FIG. 1 shows this kind of an electrode slipping device having, on the left side encircled with a dot-and-dash line denoted with A, two prior art clamping devices 5' mounted on the upper holder ring 2 and on the lower holder ring 3.
  • Figure 2 shows such a prior art clamping device 5'.
  • the clamping device 5' comprises a frame element 6' which is attachable to a holder ring 2 and/or 3 to be stationary in relation to the holder ring.
  • a cylinder portion 7' is stationary in relation to the frame element 6'.
  • a plunger 8 is arranged to be engaged with a clamping shoe (not shown).
  • the plunger 8 comprises a cylindrical housing 9' and an end plate 10' (not shown).
  • a pressing spring (not shown) is arranged inside the cylindrical housing 9' to act between the frame element 6' and the plunger 8' for urging the plunger 8' towards the clamping shoe and for pressing the clamping shoe against the electrode E.
  • Four tension bars 12' are arranged outside the cylindrical housing 9' inside which the pressing spring is located. Each tension bar 12' has a first end which is releasably attached to the end plate 10' of the plunger 8'.
  • a piston element (not shown) is arranged movable inside the cylinder portion 7' to form a hydraulic power means 16' wherein the piston element can be moved by hydraulic pressure of hydraulic fluid which is arranged to be guided to a space between the piston element and the cylinder portion. Movement of the piston element by hydraulic pressure of the hydraulic fluid causes the tension bars 12' to pull the plunger 8 against the spring force of the pressing spring to move the clamping shoe from a clamping position to a release position.
  • the four tension bars are located outside the cylindrical housing which accommodates the pressing spring.
  • This kind of arrangement of tension bars makes the clamping device bulky and heavy.
  • the end plates, to which the tension bars are attached, must be both wide and thick to be sturdy enough to withstand the bending force caused by the pressing spring acting on the central region of the end plate and at a distance from the support points to tension bars, in order to avoid bending of the end plates.
  • the clamping device also has many parts making it complicated and expensive to manufacture and difficult to service.
  • the objective of the invention is to alleviate the disadvantages mentioned above.
  • an electrode slipping device having a clamping device which has a simple, compact and light-weight structure with few parts, easy to maintenance and cheap to manufacture.
  • the present invention provides an electrode slipping device according to claim 1, further advantageous embodiments are provided in the appended dependent claims 2-11.
  • the clamping device comprises one and single tension bar arranged centrally in relation to the frame element, the plunger, the pressing spring and the piston element.
  • the lower holder ring comprises a single clamping device configured to releasably press one clamping shoe against the surface of the electrode.
  • the lower holder ring comprises a contact shoe made of electrically conductive material for supplying current to the electrode and the contact shoe is arranged at an opposite side of the lower holder ring in relation to the position of the clamping shoe.
  • the advantage of the invention is that due to one and single central tension bar the clamping device can be a simple, compact and light-weight structure with few parts, being easy to maintenance and cheap to manufacture.
  • the single centrally arranged tension bar enables that a thick end plate is not needed since the tension bar does not exert bending forces to the end plate, as happens in the prior art device.
  • a prior art clamping device having a pressing force 60 tn may have a weight 450 kg.
  • the weight of the clamping device according to the invention with the same pressing force may be less than 300 kg. Reduction of weight is considerable.
  • the frame element, the plunger and the pressing spring each have a central hole to receive the tension bar therein.
  • the end plate has a central hole having an inner thread, and that the first end of the tension bar has a first outer thread threaded to the inner thread of the end plate.
  • the second end of the tension bar has a second outer thread on which a lock nut is threaded.
  • the clamping device comprises two or more cylinder portions and piston elements disposed radially around the tension bar to form two or more hydraulic power means around the tension bar.
  • the clamping device comprises three or four cylinder portions and piston elements disposed radially around the tension bar to form three or four hydraulic power means around the tension bar.
  • the clamping device comprises a second end plate to which the piston elements are attached, the second end plate comprising inlets and outlets for guiding the hydraulic fluid to and from the two or more hydraulic power means.
  • the cylinder portion and the piston element are both annular thereby forming an annular hydraulic power means which is concentric in relation to the tension bar.
  • the frame element comprises an inlet and an outlet for guiding the hydraulic fluid to and from the annular hydraulic power means
  • the pressing spring consists of a plurality of conical disc spring washers.
  • the upper holder ring is attached to a stationary structure, and that the lower holder ring is suspended from the stationary structure by vertical hydraulic cylinders.
  • FIG 1 shows an electrode slipping device 1 which is for holding and slipping of a self-baking Söderberg electrode E.
  • the slipping device 1 comprises an upper holder ring 2 and a lower holder ring 3.
  • the upper holder ring 2 and the lower holder ring 3 both comprise several clamping assemblies including a clamping shoe (not shown in Figure 1 ) and a clamping device 5 arranged in co-operation with each other.
  • the clamping shoe is operable between a clamping position where an electrode E is clamped and held in its position and a release position where the electrode E is unclamped and can be moved.
  • the operation principle of the clamping device 5 is explained in more detail with reference to Figure 9 and 10 .
  • the operation principle of the slipping device 1 is known from the prior art.
  • the slipping device allows controlled displacement of the electrode.
  • the upper and lower holder rings 2, 3, are sequentially operated and moved to extend the electrode as the tip of the electrode is consumed in use in the furnace.
  • the two holder rings 2, 3 are connected with vertical hydraulic cylinders 100 that enable relative movement between the upper and lower holder rings. This action enables slipping through of the electrode whilst always maintaining a positive grip on the outer surface of the electrode.
  • FIG 1 the clamping devices 5 according to the invention are installed in the upper and lower holder rings 2, 3 and are shown on the right side and encircled by a dot-and-dash line denoted by B.
  • the clamping device 5 is also shown in Figure 3 .
  • Figure 3 shows that the new clamping device 5 is a more simple, compact and light-weight structure with fewer parts.
  • clamping device 5 The structure of the clamping device 5 is disclosed in more detail with reference to Figures 5 to 10 in the following.
  • the clamping device 5 comprises a frame element 6 which is fixedly attached to a lower holder ring 3 to be stationary in relation to the holder ring.
  • a cylinder portion 7 is arranged stationary in relation to the frame element 6.
  • the cylinder portion 7 may be a separate part in relation to the frame element 6 whereby the cylinder portion 7 is attached to the frame element 6.
  • the clamping element 5 comprises a plunger 8.
  • the plunger 8 comprises a cylindrical housing 9 and an end plate 10.
  • the end plate 10 can be engaged with the clamping shoe 4 to press it.
  • a pressing spring 11 is arranged inside the cylindrical housing 9. The pressing spring 11 acts between the frame element 6 and the end plate 10 of the plunger 8 urging the plunger 8 towards the clamping shoe 4 and for pressing the clamping shoe 4 against the electrode E.
  • One and single centrally disposed tension bar 12 is releasably attached to the end plate 10 of the plunger 8.
  • the end plate 10 has a central hole 19 having an inner thread 20.
  • the first end 13 of the tension bar 12 has a first outer thread 21 which is threaded to the inner thread 20 of the end plate 10 to provide a releasable attachment.
  • a piston element 15 is arranged movable inside the cylinder portion 7 of the frame element 6 to form a hydraulic power means 16.
  • the piston element 15 can be moved by hydraulic pressure of hydraulic fluid which is guided into a space S between the piston element 15 and the cylinder portion 7. Movement of the piston element 15 by hydraulic pressure of the hydraulic fluid causes the tension bar 12 to pull the plunger 8 against the spring force of the pressing spring 11 to move the clamping shoe 4 from the clamping position I ( Figure 9 ) to the release position II ( Figure 10 ).
  • the one and single tension bar 12 is arranged centrally in relation to the frame element 6, the plunger 8, the pressing spring 11 and the piston element 15.
  • the frame element 6, the plunger 8 and the pressing spring 11 each have a central hole 17, 18, 19 to receive the tension bar 12 therein.
  • the second end 14 of the tension bar 12 has a second outer thread 22 on which a lock nut 23 is threaded.
  • Figures 5 to 8 show an embodiment of the clamping device 5 which comprises four cylinder portions 7 and four piston elements 15 disposed radially around the tension bar 12 to form four hydraulic power means 16 around the tension bar 12.
  • the clamping device 5 comprises a second end plate 24 to which the piston elements 15 are attached.
  • the second end plate 24 comprising inlets 25 and outlets 26 for guiding the hydraulic fluid to and from the two or more hydraulic power means 16.
  • the inlet 25 is at a lower level than the outlet 26 in order to prevent formation of air bubbles in the hydraulic fluid.
  • the four hydraulic cylinder means are connected in series so that the hydraulic fluid flows through all four hydraulic power means 16.
  • Figures 9 and 10 show another embodiment wherein the cylinder portion 7 and the piston element 15 are both annular thereby forming one annular hydraulic power means 16 which is concentric in relation to the tension bar 12.
  • An annular hydraulic power means 16 is compact and can provide a great force.
  • the cylinder portion 7 comprises an inlet 25 and an outlet 26 for guiding the hydraulic fluid to and from the annular hydraulic power means 16.
  • the outlet 26 is above the level of the inlet 25 in order to prevent formation ofairb bubbles in the hydraulic fluid.
  • the pressing spring 11 consists of a plurality of conical disc spring washers 27, so-called Belleville washers, arranged as a stack.
  • the hydraulic power means 16 of the clamping devices 5 of both embodiments of Figure 5 and Figure 9 can be easily detached for service simply by removing the lock nut 23 and by unthreading the tension bar 12 from the end plate 10 whereby the frame element 6, plunger 8 and the pressing spring can remain in its place to press the clamping shoe 4 while the cylinder portion 7 and the piston element 15 are detached.
  • Figure 4 shows an electrode slipping device 1 designed for graphite electrode.
  • the lower holder ring 3 comprises a single clamping device 5 arranged to releasably press one clamping shoe 4 against the surface of the electrode E (shown in Figure 5 ).
  • the lower holder ring also comprises a single contact shoe 28 made of electrically conductive material for supplying current to the electrode.
  • the contact shoe 28 is arranged at an opposite side of the lower holder ring 3 in relation to the position of the clamping shoe 4.
  • the upper holder ring 2 is attached to a stationary structure 29.
  • the lower holder ring 3 is suspended from the stationary structure 29 by vertical hydraulic cylinders 30.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Clamps And Clips (AREA)
  • Gripping On Spindles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (11)

  1. Elektrodengleitvorrichtung (1) für eine Graphitelektrode, umfassend einen oberen Haltering (2) und einen unteren Haltering (3), wobei der obere Haltering und der untere Haltering eine oder mehrere Klemmbaugruppen beinhalten, die einen Klemmschuh (4) und eine Klemmvorrichtung (5) enthalten, die in Zusammenwirkung miteinander derart vorgesehen sind, dass der Klemmschuh (4) zwischen einer Klemmposition (I), in der eine Elektrode (E) geklemmt ist, und einer Freigabeposition (II), in der die Elektrode (E) ungeklemmt ist, betriebsfähig ist, und wobei die Klemmvorrichtung (5) umfasst:
    - ein Rahmenelement (6), das an einem Haltering (2, 3) starr anbringbar ist, um in Bezug auf den Haltering stationär zu sein,
    - einen Zylinderbereich (7), wobei der Zylinderbereich (7) stationär in Bezug auf das Rahmenelement (6) vorgesehen ist,
    - einen Plunger (8), wobei der Plunger (8) ein zylindrisches Gehäuse (9) und eine Endplatte (10) umfasst, die dazu vorgesehen ist, von dem Klemmschuh (4) angegriffen zu werden,
    - eine Druckfeder (11), die innerhalb des zylindrischen Gehäuses (9) vorgesehen ist, um zwischen dem Rahmenelement (6) und dem Plunger (8) zu wirken, um den Plunger (8) in Richtung des Klemmschuhs (4) zu beaufschlagen, und um den Klemmschuh (4) gegen die Elektrode (E) zu drücken,
    - einen Spannbalken (12), der ein erstes Ende (13) hat, das freigebbar an der Endplatte (10) des Plungers (8) angebracht ist, und ein zweites Ende (14),
    - ein Kolbenelement (15), das bewegbar innerhalb des Zylinderbereichs (7) vorgesehen ist, um ein hydraulisches Kraftmittel (16) zu bilden, wobei das Kolbenelement durch hydraulischen Druck von hydraulischem Fluid, das dazu vorgesehen ist, zu einem Raum zwischen dem Kolbenelement (15) und dem Zylinderbereich (7) geleitet zu werden, bewegt werden kann, wobei Bewegung des Kolbenelements durch hydraulischen Druck des hydraulischen Fluids bewirkt, dass der Spannbalken den Plunger (8) gegen die Federkraft der Druckfeder (11) zieht, um den Klemmschuh (4) von der Klemmposition (I) zu der Freigabeposition (II) zu bewegen, und einen Kontaktschuh (28), der aus elektrisch leitendem Material gemacht ist, zum Bereitstellen von Strom an die Elektrode,
    dadurch gekennzeichnet, dass die Klemmvorrichtung (5) einen einzigen Spannbalken (12) umfasst, der zentral in Bezug auf das Rahmenelement (6), den Plunger (8), die Druckfeder (11) und das Kolbenelement (15) vorgesehen ist,
    und wobei der untere Haltering (3) eine einzelne Klemmvorrichtung (5) umfasst, die dazu vorgesehen ist, einen Klemmschuh (4) freigebbar gegen die Oberfläche der Elektrode (E) zu drücken, und wobei der Kontaktschuh (28) an einer gegenüberliegenden Seite des unteren Halterings (3) in Bezug auf die Position des Klemmschuhs (4) vorgesehen ist.
  2. Elektrodengleitvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Rahmenelement (6), der Plunger (8) und die Druckfeder (11) jeweils ein zentrales Loch (17, 18, 19) haben, um den Spannbalken (12) darin aufzunehmen.
  3. Elektrodengleitvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Endplatte (10) ein zentrales Loch (19) hat, das ein Innengewinde (20) hat, und dass das erste Ende (13) des Spannbalkens (12) ein erstes Außengewinde (21) hat, das auf das Innengewinde (20) der Endplatte (10) geschraubt ist.
  4. Elektrodengleitvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das zweite Ende (14) des Spannbalkens (12) ein zweites Außengewinde (22) hat, auf das eine Kontermutter (23) geschraubt ist.
  5. Elektrodengleitvorrichtung nach einer der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Klemmvorrichtung (5) zwei oder mehr Zylinderbereiche (7) und Kolbenelemente (15) umfasst, die radial um den Spannbalken (12) angeordnet sind, um zwei oder mehr hydraulische Kraftmittel (16) um den Spannbalken zu bilden.
  6. Elektrodengleitvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Klemmvorrichtung (5) drei oder vier Zylinderbereiche (7) und Kolbenelemente (15) umfasst, die radial um den Spannbalken (12) angeordnet sind, um drei oder vier hydraulische Kraftmittel (16) um den Spannbalken zu bilden.
  7. Elektrodengleitvorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Klemmvorrichtung eine zweite Endplatte (24) umfasst, an der die Kolbenelemente (15) angebracht sind, wobei die zweite Endplatte (24) Einlässe (25) und Auslässe (26) zum Leiten des hydraulischen Fluids zu und von den zwei oder mehr hydraulischen Kraftmitteln (16) umfasst.
  8. Elektrodengleitvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Zylinderbereich (7) und das Kolbenelement (15) beide ringförmig sind, und dadurch ein ringförmiges hydraulisches Kraftmittel (16) bilden, das konzentrisch in Bezug auf den Spannbalken (12) ist.
  9. Elektrodengleitvorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Rahmenelement (6) einen Einlass (25) und einen Auslass (26) zum Leiten des hydraulischen Fluids zu und von den ringförmigen hydraulischen Kraftmitteln (16) umfasst.
  10. Elektrodengleitvorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Druckfeder (11) aus einer Mehrzahl von Tellerfedern (27) besteht.
  11. Elektrodengleitvorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der obere Haltering (2) an einer stationären Struktur (29) angebracht ist, und dass der untere Haltering (3) an der stationären Struktur (29) durch vertikale hydraulische Zylinder (30) aufgehängt ist.
EP17897433.3A 2017-02-27 2017-02-27 Elektrodengleitvorrichtung Active EP3586569B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17897433T PL3586569T3 (pl) 2017-02-27 2017-02-27 Urządzenie do wślizgiwania elektrody

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2017/050126 WO2018154173A1 (en) 2017-02-27 2017-02-27 Electrode slipping device

Publications (3)

Publication Number Publication Date
EP3586569A1 EP3586569A1 (de) 2020-01-01
EP3586569A4 EP3586569A4 (de) 2020-12-02
EP3586569B1 true EP3586569B1 (de) 2021-12-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17897433.3A Active EP3586569B1 (de) 2017-02-27 2017-02-27 Elektrodengleitvorrichtung

Country Status (8)

Country Link
EP (1) EP3586569B1 (de)
CN (1) CN110326360B (de)
CA (1) CA3052687C (de)
EA (1) EA037728B1 (de)
LT (1) LT3586569T (de)
PL (1) PL3586569T3 (de)
WO (1) WO2018154173A1 (de)
ZA (1) ZA201905163B (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030043000A (ko) * 2001-11-26 2003-06-02 주식회사 포스코 전기로 전극봉 홀더

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US4154974A (en) * 1977-09-16 1979-05-15 Lectromelt Corporation Clamp for arc furnace electrode
US4182927A (en) * 1978-08-04 1980-01-08 Dixie Bronze Company Electrode holders having differential clamping devices
US7075966B2 (en) * 2004-05-20 2006-07-11 Hatch, Ltd. Electrode column
CN101769685B (zh) * 2008-12-30 2012-06-06 中国恩菲工程技术有限公司 电极装置
CA2756911C (en) * 2009-03-31 2017-08-29 Alcoa Inc. Electrode holder assembly and furnace comprising same
CN201821530U (zh) * 2010-08-31 2011-05-04 中国西电集团公司 一种石墨电极夹放缸
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CN104520662B (zh) * 2012-06-28 2017-05-24 雅克·文特尔 电极夹持装置
FI125074B (fi) * 2013-07-05 2015-05-29 Outotec Finland Oy Kiristyssylinteri elektrodinohjauslaitetta varten
CN203352853U (zh) * 2013-07-30 2013-12-18 张家港浦项不锈钢有限公司 电弧炉电极夹持器

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
KR20030043000A (ko) * 2001-11-26 2003-06-02 주식회사 포스코 전기로 전극봉 홀더

Also Published As

Publication number Publication date
EA037728B1 (ru) 2021-05-14
ZA201905163B (en) 2020-05-27
LT3586569T (lt) 2022-02-10
EP3586569A4 (de) 2020-12-02
CN110326360B (zh) 2022-04-05
EA201991785A1 (ru) 2020-02-07
CN110326360A (zh) 2019-10-11
WO2018154173A1 (en) 2018-08-30
CA3052687A1 (en) 2018-08-30
EP3586569A1 (de) 2020-01-01
PL3586569T3 (pl) 2022-03-28
CA3052687C (en) 2023-09-05

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