US3804966A - Furnace electrode clamp - Google Patents

Furnace electrode clamp Download PDF

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Publication number
US3804966A
US3804966A US00377306A US37730673A US3804966A US 3804966 A US3804966 A US 3804966A US 00377306 A US00377306 A US 00377306A US 37730673 A US37730673 A US 37730673A US 3804966 A US3804966 A US 3804966A
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US
United States
Prior art keywords
electrode
pad
slots
slot
clamp
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.)
Expired - Lifetime
Application number
US00377306A
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English (en)
Inventor
F Winter
L Truswell
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.)
British Steel Corp
Original Assignee
British Steel Corp
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 British Steel Corp filed Critical British Steel Corp
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Publication of US3804966A publication Critical patent/US3804966A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/103—Mountings, supports or terminals with jaws

Definitions

  • ABSTRACT This invention relates to an electrode clamp embodying two graphite pads or liners which are each key slotted into the clamp body in dovetail-like fashion.
  • the front surfaces are part-cylindrical to mate with the surface of the electrode while the rear surfaces are plain.
  • a water coolant conduit is provided in the clamp body extending alongside the pads providing go and return paths.
  • This invention relates to furnace electrode clamps and more specifically relates to clamps for carbon electrodes employed in electric arc furnaces, particularly coated electrodes.
  • the clamp comprises a copper body portion having a part-cylindrical surface corresponding to and mating with that of the electrode, the latter being drawn into firm contact with this surface through a band or yoke which embraces the electrode. Whilst this is satisfactory for plain carbon electrodes it is not suitable for such electrodes which have a current conducting protective coating on them, since frequently the metals of the coating and the body together form a eutectic system causing local melting at the operating temperature. This manifests itself as welding and pitting of, the contact surfaces which, in turn, increases the electrical contact resistance aggravating the situation whereby local arcing begins to develop causing further deterioration.
  • the present invention provides a furnace electrode clamp comprising a metallic body portion and at least one graphite pad mounted on the surface of the body portion against which the electrode is clamped, the pad being located in and retained by a key slot in the body.
  • the slot is preferably machined to define a dovetaillike section axially of the electrode, whereby the pad may normally be inserted in and removed from the slot in a vertical direction, a stop member being provided along the bottom of the slot against which the pad abuts.
  • the inner wall of the slot is preferably planar, matching the rear face of the pad, the front face of which being part-cylindrical to match the surface of the electrode.
  • a plate is bolted on to the body portion extending over the top end of the slot and overlapping the top of the pad so as to secure it firmly.
  • a water coolant conduit may be provided within the body portion running alongside the pad.
  • More than one such pad and associated key slot, etc. may of course be provided in the body portion, and two are particularly advantageous since it provides three point contact with the band although the band may itself provide dual contact areas.
  • the provision of two pads/key slots also facilitates the coolant design since the go and return paths may separately run alongside these two.
  • the two graphite pads or liners are individually more manageable than a single pad of more thantwice the size and weight, and their basic cost is less expensive as also is the machining and fabrication involved, in comparison with the single arcuate section pad employed hitherto.
  • FIG. 1 is a plan view of a furnace clamp according to the invention with an electrode in situ;
  • FIG. 2 is a side elevation of the FIG. ll arrangement
  • FIG. 3 is a part-section along IIIIII in FIG. 1.
  • the clamp comprises a body portion 1 made from copper having an upper tang 2 for bus-bar connections from the power supply and a lower portion 3 having an inwardly facing generally part-cylindrical surface 4.
  • Two bosses 5 protrude from opposite sides of the body and provide bearings for a stirrup member 6 which is movable about the axis of the bosses in the direction of the arrow by hydraulic/pneumatic means (not shown).
  • the lower end 7 of the stirrup extends through slots 8 formed in an austenitic stainless steel band 9 which embraces a coated electrode 10 extending through the clamp, the band being designed to have two inwardly protruding surfaces 11 for firmly contacting the electrode.
  • the copper body portion is additionally provided with a U shaped conduit 12 for water (coolant) and two dove-tail like slots or recesses 13 are machined into the cylindrical surface 4 alongside the path of this conduit.
  • two high-strength graphite pads 14 which have a part cylindrical front surface corresponding to that of the electrode and a plain back, these pads being inserted into the slots from above and seating on a strip of insulating material 15 (e.g. Sindanyo) along the base of the body (FIG. 3).
  • insulating material 15 e.g. Sindanyo
  • These pads are secured against withdrawal by two austenitic stainless steel plates 16 which are mounted on the upper surface of the body by stainless steel studs/- nuts and overlap the pads.
  • the electrode 10 is inserted through the aperture defined by the band and the copper body with the stirrup moved into a forward position so as to allow freedom for this movement. Subsequently, with the electrode in place the stirrup is moved back drawing the band with it and firmly clamping the electrode against the graphite pads secured in the body portion, the graphite contact providing a very low contact resistance as compared with the band/electrode contact.
  • a clamp for a non-consumable coated electrode in an electric arc furnace comprising:
  • a clamp according to claim 1 in which the key slot is a machined dovetail-like section extending axially of the electrode whereby the pad may be inserted in, and removed from, the slot in a vertical sense and in which a stop member is provided along the bottom of the slot against which the pad abuts.
  • a clamp according to claim 2 in which the slot has a planar inner wall, matching the rear face of the pad, the front face of the pad being part-cylindrical to match the surface of the electrode.
  • a clamp according to claim 3 in which the body defines a water-coolant conduit running alongside the pad.
  • a clamp according to claim 4 comprising,
  • a furnace electrode clamp comprising, a metallic body portion of generally arcuate configuration and defining i. two key slots on one surface at circumferentially spaced positions, and ii. a water-coolant conduit running alongside the slots and providing go and return coolant paths a graphite p'ad mounted in, and retained by, each of said slots against which the electrode is to be clamped, the slots extending axially of the electrode whereby the pads may be inserted in, and removed from, the slots in a vertical sense.
  • each key slot is a machined dovetail-like section having a planar inner wall matching the rear face of the pad, the front face of the pad being part-cylindrical to match the surface of the electrode.
  • a clamp according to claim 7, comprising,
  • a U-shaped band mounted for movement on the body perpendicular to the electrode axis and adapted to embrace the electrode to effect clamping thereof.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)
US00377306A 1972-07-07 1973-07-09 Furnace electrode clamp Expired - Lifetime US3804966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3201572A GB1404661A (en) 1972-07-07 1972-07-07 Furnace electrode clamp

Publications (1)

Publication Number Publication Date
US3804966A true US3804966A (en) 1974-04-16

Family

ID=10331775

Family Applications (1)

Application Number Title Priority Date Filing Date
US00377306A Expired - Lifetime US3804966A (en) 1972-07-07 1973-07-09 Furnace electrode clamp

Country Status (3)

Country Link
US (1) US3804966A (enExample)
JP (1) JPS4951644A (enExample)
GB (1) GB1404661A (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932785A (en) * 1974-08-26 1976-01-13 Shigeru Suga Carbon electrode support
EP0021835A1 (en) * 1979-07-02 1981-01-07 British Steel Corporation Arc furnace electrode clamps
FR2542962A1 (fr) * 1983-03-15 1984-09-21 Npp Elektrotermia Tete de contact pour porte-electrodes de fours a arc electrique
US4531219A (en) * 1982-08-26 1985-07-23 Arc Technologies Systems Ltd. Electrode assembly for arc furnaces
EP0533151A1 (de) * 1991-09-18 1993-03-24 Flohe GmbH & Co Einspannungsarm für die Elektrode eines Elektroofens
DE102004005051A1 (de) * 2004-01-30 2005-08-18 Arndt Dung Am freien Ende eines Bestandteil eines Elektroofens bildenden Elektrodentragarms auswechselbar angeordnete Kontaktbacke
US20130038174A1 (en) * 2011-08-08 2013-02-14 Samsung Electro-Mechanics Co., Ltd. Ultrasonic sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63254696A (ja) * 1987-04-10 1988-10-21 アルコインダストリーズ株式会社 アーク炉用電極ホルダにおける電極把持ブロックの製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3457355A (en) * 1967-09-19 1969-07-22 Vitro Corp Of America Brush electrode assembly for consumable electrodes
US3509261A (en) * 1968-12-05 1970-04-28 Dixie Bronze Co Electric furnace electrode head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3457355A (en) * 1967-09-19 1969-07-22 Vitro Corp Of America Brush electrode assembly for consumable electrodes
US3509261A (en) * 1968-12-05 1970-04-28 Dixie Bronze Co Electric furnace electrode head

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932785A (en) * 1974-08-26 1976-01-13 Shigeru Suga Carbon electrode support
US4323717A (en) * 1979-02-07 1982-04-06 British Steel Corporation Furnace electrode clamps
EP0021835A1 (en) * 1979-07-02 1981-01-07 British Steel Corporation Arc furnace electrode clamps
US4531219A (en) * 1982-08-26 1985-07-23 Arc Technologies Systems Ltd. Electrode assembly for arc furnaces
FR2542962A1 (fr) * 1983-03-15 1984-09-21 Npp Elektrotermia Tete de contact pour porte-electrodes de fours a arc electrique
EP0533151A1 (de) * 1991-09-18 1993-03-24 Flohe GmbH & Co Einspannungsarm für die Elektrode eines Elektroofens
DE102004005051A1 (de) * 2004-01-30 2005-08-18 Arndt Dung Am freien Ende eines Bestandteil eines Elektroofens bildenden Elektrodentragarms auswechselbar angeordnete Kontaktbacke
US20090247022A1 (en) * 2004-01-30 2009-10-01 Arndt Dung Contact block at the end of an electrode support for forming a component of an electric oven
US7682156B2 (en) * 2004-01-30 2010-03-23 Arndt Dung Contact block at the end of an electrode support for forming a component of an electric oven
US20130038174A1 (en) * 2011-08-08 2013-02-14 Samsung Electro-Mechanics Co., Ltd. Ultrasonic sensor

Also Published As

Publication number Publication date
GB1404661A (en) 1975-09-03
JPS4951644A (enExample) 1974-05-20

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