EP3586569B1 - Dispositif de glissement d'électrode - Google Patents

Dispositif de glissement d'électrode 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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German (de)
English (en)
Other versions
EP3586569A1 (fr
EP3586569A4 (fr
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/fr
Publication of EP3586569A4 publication Critical patent/EP3586569A4/fr
Application granted granted Critical
Publication of EP3586569B1 publication Critical patent/EP3586569B1/fr
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. Dispositif de glissement d'électrode (1) pour une électrode en graphite comprenant une bague de support supérieure (2) et une bague de support inférieure (3), la bague de support supérieure et la bague de support inférieure contenant un ou plusieurs ensemble(s) de serrage comprenant un sabot de serrage (4) et un dispositif de serrage (5) agencés en coopération l'un avec l'autre de sorte que le sabot de serrage (4) puisse fonctionner entre une position de serrage (I), où une électrode (E) est serrée, et une position de libération (II), où l'électrode (E) est desserrée, et dans lequel le dispositif de serrage (5) comprend
    - un élément de cadre (6) pouvant être attaché de manière fixe à une bague de support (2, 3) pour être fixe par rapport à la bague de support,
    - une partie de cylindre (7), la partie de cylindre (7) étant agencée fixe par rapport à l'élément de cadre (6),
    - un plongeur (8), le plongeur (8) comprenant un boîtier cylindrique (9) et une plaque d'extrémité (10) agencée pour s'engager avec le sabot de serrage (4),
    - un ressort de pression (11) agencé à l'intérieur du boîtier cylindrique (9) pour agir entre l'élément de cadre (6) et le plongeur (8), pour pousser le plongeur (8) vers le sabot de serrage (4) et pour presser le sabot de serrage (4) contre l'électrode (E),
    - une barre de tension (12) ayant une première extrémité (13) attachée de manière amovible à la plaque d'extrémité (10) du plongeur (8), et une deuxième extrémité (14),
    - un élément de piston (15) agencé de manière mobile à l'intérieur de la partie de cylindre (7) pour former un moyen de puissance hydraulique (16) dans lequel l'élément de piston peut être déplacé par la pression hydraulique d'un fluide hydraulique qui est agencé pour être guidé vers un espace entre l'élément de piston (15) et la partie de cylindre (7), moyennant quoi le déplacement de l'élément de piston par la pression hydraulique du fluide hydraulique amène la barre de tension à tirer le piston (8) contre la force de ressort du ressort de pression (11) pour déplacer le sabot de serrage (4) de la position de serrage (I) à la position de libération (II), et un sabot de contact (28) réalisé en un matériau électroconducteur pour alimenter en courant l'électrode,
    caractérisé en ce que le dispositif de serrage (5) comprend une seule et unique barre de tension (12) agencée de manière centrale par rapport à l'élément de cadre (6), au plongeur (8), au ressort de pression (11) et à l'élément de piston (15),
    et dans lequel la bague de support inférieure (3) comprend un seul dispositif de serrage (5) agencé pour presser de manière amovible un sabot de serrage (4) contre la surface de l'électrode (E), et le sabot de contact (28) étant agencé d'un côté opposé de la bague de support inférieure (3) par rapport à la position du sabot de serrage (4).
  2. Dispositif de glissement d'électrode selon la revendication 1, caractérisé en ce que l'élément de cadre (6), le plongeur (8) et le ressort de pression (11) ont chacun un trou central (17, 18, 19) pour recevoir à l'intérieur la barre de tension (12).
  3. Dispositif de glissement d'électrode selon la revendication 1 ou 2, caractérisé en ce que la plaque d'extrémité (10) présente un trou central (19) ayant un filetage intérieur (20), et en ce que la première extrémité (13) de la barre de tension (12) présente un premier filetage extérieur (21) vissé sur le filetage intérieur (20) de la plaque d'extrémité (10).
  4. Dispositif de glissement d'électrode selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la deuxième extrémité (14) de la barre de tension (12) présente un deuxième filetage extérieur (22) sur lequel est vissé un écrou de blocage (23).
  5. Dispositif de glissement d'électrode selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le dispositif de serrage (5) comprend deux parties de cylindre (7) ou plus et des éléments de piston (15) disposés radialement autour de la barre de tension (12) pour former deux moyens de puissance hydraulique (16) ou plus autour de la barre de tension.
  6. Dispositif de glissement d'électrode selon la revendication 5, caractérisé en ce que le dispositif de serrage (5) comprend trois ou quatre parties de cylindre (7) et des éléments de piston (15) disposés radialement autour de la barre de tension (12) pour former trois ou quatre moyens de puissance hydraulique (16) autour de la barre de tension.
  7. Dispositif de glissement d'électrode selon la revendication 5 ou 6, caractérisé en ce que le dispositif de serrage comprend une deuxième plaque d'extrémité (24) à laquelle sont attachés les éléments de piston (15), la deuxième plaque d'extrémité (24) comprenant des entrées (25) et des sorties (26) pour guider le fluide hydraulique vers et depuis les deux moyens de puissance hydraulique (16) ou plus.
  8. Dispositif de glissement d'électrode selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la partie de cylindre (7) et l'élément de piston (15) sont tous deux annulaires formant ainsi un moyen de puissance hydraulique annulaire (16) qui est concentrique par rapport à la barre de tension (12).
  9. Dispositif de glissement d'électrode selon la revendication 8, caractérisé en ce que l'élément de cadre (6) comprend une entrée (25) et une sortie (26) pour guider le fluide hydraulique vers et depuis le moyen de puissance hydraulique annulaire (16).
  10. Dispositif de glissement d'électrode selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le ressort de pression (11) est constitué d'une pluralité de rondelles de ressort à disque coniques (27).
  11. Dispositif de glissement d'électrode selon l'une quelconque des revendications 1 à 10, caractérisé en ce que la bague de support supérieure (2) est attachée à une structure fixe (29), et en ce que la bague de support inférieure (3) est suspendue à la structure fixe (29) par des vérins hydrauliques verticaux (30).
EP17897433.3A 2017-02-27 2017-02-27 Dispositif de glissement d'électrode Active EP3586569B1 (fr)

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 (fr) 2017-02-27 2017-02-27 Dispositif de glissement d'électrode

Publications (3)

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

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ID=63252432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17897433.3A Active EP3586569B1 (fr) 2017-02-27 2017-02-27 Dispositif de glissement d'électrode

Country Status (8)

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

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN117250242A (zh) * 2023-09-04 2023-12-19 青岛宜博铜业集团有限公司 电极夹持自调节装置

Citations (1)

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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
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CN101769685B (zh) * 2008-12-30 2012-06-06 中国恩菲工程技术有限公司 电极装置
US8406268B2 (en) * 2009-03-31 2013-03-26 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
CN202524587U (zh) * 2011-12-07 2012-11-07 宜兴市宇龙电炉成套设备有限公司 一种单抱闸电极压放装置
US9775198B2 (en) * 2012-06-28 2017-09-26 Jacques Venter Electrode clamping device
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

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KR20030043000A (ko) * 2001-11-26 2003-06-02 주식회사 포스코 전기로 전극봉 홀더

Also Published As

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

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