EP3586569A1 - Elektrodengleitvorrichtung - Google Patents

Elektrodengleitvorrichtung

Info

Publication number
EP3586569A1
EP3586569A1 EP17897433.3A EP17897433A EP3586569A1 EP 3586569 A1 EP3586569 A1 EP 3586569A1 EP 17897433 A EP17897433 A EP 17897433A EP 3586569 A1 EP3586569 A1 EP 3586569A1
Authority
EP
European Patent Office
Prior art keywords
clamping
electrode
plunger
tension bar
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.)
Granted
Application number
EP17897433.3A
Other languages
English (en)
French (fr)
Other versions
EP3586569A4 (de
EP3586569B1 (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
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 Outotec Finland Oy filed Critical 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
Anticipated expiration legal-status Critical

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
    • H05B7/107—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 hav ⁇ ing, 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 be- tween the frame element 6' and the plunger 8' for urg ⁇ ing 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 cylin ⁇ drical 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 1' 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 hy ⁇ draulic 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 posi- tion to a release position.
  • the four tension bars are located out ⁇ side 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.
  • the present invention provides an electrode slipping device com ⁇ prising an upper holder ring and a lower holder ring, the upper holder ring and the lower holder ring containing one or more clamping assemblies including a clamping shoe and a clamping device arranged in co- operation with each other, so that the clamping shoe is operable between a clamping position, where an electrode is clamped, and a release position, where the electrode is undamped.
  • the clamping device com- prises a frame element fixedly attachable to a holder ring to be stationary in relation to the holder ring.
  • the clamping device comprises a cylinder portion, the cylinder portion being arranged stationary in relation to the frame element.
  • the clamping device comprises a plunger, the plunger comprising a cylindrical housing and an end plate arranged to be engaged with the clamping shoe.
  • the clamping device comprises a press ⁇ ing spring arranged inside the cylindrical housing to act between the frame element and the plunger, for urging the plunger towards the clamping shoe and for pressing the clamping shoe against the electrode.
  • the clamping device comprises a tension bar having a first end releasably attached to the end plate of the plung ⁇ er, and a second end.
  • the clamping device comprises a piston element arranged movable inside the cylinder portion to form a hydraulic power means 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 por- tion. Movement of the piston element by hydraulic pressure of the hydraulic fluid causes the tension bar to pull the plunger against the spring force of the pressing spring to move the clamping shoe from the clamping position to the release position.
  • 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 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 manufac ⁇ ture.
  • the single centrally arranged tension bar ena ⁇ bles 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. Re ⁇ duction 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 por- tions 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 hydrau ⁇ lic 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 lower holder ring comprises a single clamping device configured to releasably press one clamping shoe against the surface of the electrode.
  • the low ⁇ er holder ring comprises a contact shoe made of elec ⁇ trically conductive material for supplying current to the electrode, the contact shoe being arranged at an opposite side of the lower holder ring in relation to the position of the clamping shoe.
  • 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 cylin ⁇ ders .
  • Figure 1 shows an axonometric view of an electrode slipping device provided with clamping devices accord- ing to prior art A and according to a first embodiment of the invention B,
  • Figure 2 shows an axonometric view of a prior art clamping device
  • Figure 3 shows an axonometric view of a clamping de ⁇ vice of a first embodiment of the electrode slipping device of the invention
  • Figure 4 shows an axonometric view of an electrode slipping device according to a second embodiment of the invention
  • Figure 5 shows a cross-section V-V from Figure 4,
  • Figure 6 shows a side view of a clamping device of Figure 5
  • Figure 7 shows an end view VII-VII of the clamping de ⁇ vice of Figure 6
  • Figure 8 shows a cross-section VIII-VIII from Figure 6
  • Figure 9 shows a longitudinal cross-section of a fur ⁇ ther embodiment of a clamping device in a clamping po- sition I wherein the hydraulic power means is unpres- surized
  • Figure 10 shows the clamping device of Figure 9 in in a release position wherein the hydraulic power means is pressurized.
  • FIG 1 shows an electrode slipping device 1 which is for holding and slipping of a self-baking Soderberg 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 undamped 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 hydrau ⁇ lic cylinders 100 that enable relative movement be ⁇ tween the upper and lower holder rings. This action enables slipping through of the electrode whilst al ⁇ ways 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 encir ⁇ cled 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 ele ⁇ ment 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 be ⁇ tween 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 central- ly 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 ten- sion 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 de ⁇ vice 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 ele ⁇ ments 15 are attached.
  • the second end plate 24 com- prising inlets 25 and outlets 26 for guiding the hy ⁇ draulic 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 ten ⁇ sion 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 hy ⁇ draulic 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 elec ⁇ trically 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)
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 true EP3586569A1 (de) 2020-01-01
EP3586569A4 EP3586569A4 (de) 2020-12-02
EP3586569B1 EP3586569B1 (de) 2021-12-15

Family

ID=63252432

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)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1608011B1 (de) * 1967-02-20 1971-06-24 Consarc Corp Abschmelzelektrodenofen
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
KR100765081B1 (ko) * 2001-11-26 2007-10-09 주식회사 포스코 전기로 전극봉 홀더
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
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
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

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
EP3586569B1 (de) 2021-12-15
CN110326360A (zh) 2019-10-11
WO2018154173A1 (en) 2018-08-30
CA3052687A1 (en) 2018-08-30
PL3586569T3 (pl) 2022-03-28
CA3052687C (en) 2023-09-05

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