FR2510338A1 - DEVICE FOR CONNECTING AND SUPPORTING COOLED COMPOSITE ELECTRODE FOR ARC ELECTRIC OVEN - Google Patents

Abstract

DEVICE INTENDED FOR THE ELECTRICAL CONNECTION, THE HYDRAULIC CONNECTION, AND THE MECHANICAL SUPPORT OF A COOLED COMPOSITE ELECTRODE FOR AN ELECTRIC ARC OVEN. IT INCLUDES A LATERAL HEAD 3 ATTACHING TO THE UPPER METAL COLUMN 2 OF THE ELECTRODE AND ALLOWING ITS FIXING AT THE END OF THE ELECTRODE HOLDER 4, THE SAID METAL COLUMN BEING EXTENDED TO ITS UPPER PART BY AT LEAST TWO 5, HOLLOW METAL APPENDICES 6 ALLOWING THE JUNCTION OF THE SAID METAL COLUMN, on the one hand, TO THE OMNIBUS TUBES 7 FOR SUPPLYING THE ELECTRIC CURRENT, AND on the other hand TO THE COOLING LIQUID CIRCULATION CIRCUIT PASSING INSIDE THESE OMNIBUS TUBES AS WELL AS INSIDE THE SAID METAL COLUMN.

Description

10338

  The present invention relates to a device for

  electrical connection, the hydraulic connection, and the medium support

  of a cooled composite electrode for an electric furnace

  bows intended for example to equip a steel plant.

  US Pat. No. 4,121,042 discloses so-called "composite" cooled electrodes. These electrodes, which comprise a metallic upper part and cooled by circulation of water, and a graphite lower part, allow significant decreases in consumption. of graphite The electrical connection and the support of the electrode are ensured by a clamp enclosing the metallic part

  of the electrode, said clamp being most often cooled by cir-

culation of water.

  These known devices have some disadvantages the support device and clamp connection is of construction

  cumbersome mechanics, which makes it impossible to reconcile

  the electrodes of each other, we know that the more we

  electrodes close to each other, the more the reaction

  tiredu oven and electrical losses, so more one increases its yield. clamp gripping the metal part of the electrode, we run the

  risk that the electrical contact is made only according to a generator.

  In order to avoid this risk, an annular insert should be

  phite in the forceps, to ensure wide contact without problems.

  The electrical connection between the current supply busbar and the electrode then passes through three successive contacts: a first contact between the busbar terminal and the clamp tail, a second contact between the clamp and the insert in graphite)

  a third contact between the graphite insert and the electrode.

  as it is usually necessary to cool the

  the clamp, we must provide two cooling circuits this

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  which leads to complex and expensive installations.

  The connection and support device according to the invention

  does not have these disadvantages. It is characterized in that it

  a lateral head adjoining the upper metal column of the electrode and allowing its attachment to the end of an electrode holder arm, in that said metal column is provided at its part

  of at least one member allowing its connection to the tubes-

  omnibus for supplying electric current and coolant

  it is equipped with means for the connection of hydrau-

  the inner hollow part of each bus tube respec-

  at the entrance and exit of the liquid circulation circuit.

  of cooling passing inside said metal column

lic.

  The invention will be better understood from the following description:

  a non-limiting example of embodiment, with reference to the

annexed in which:

  FIG. 1 is a partially exploded perspective view of an electri-

  Composite trode of electric furnace connected according to the invention.

  FIG. 2 is a partial section along the direction AA 'of the FIG.

  1 and showing one of the two connections

bus tube ".

  FIG. 3 is a partial longitudinal section of the electrode

  the position of Figure 1, showing the circulation of the coolant

in the body of it.

  FIG. 1 schematically represents a composite electrode according to the invention, conventionally comprising a lower body I

  in the form of a graphite column> and an upper body 2 in the form of a collar

  metal bar, hollow and cooled by circulation of water.

  According to the invention, the upper part of the electrode

  has a lateral head 3, also metallic and welded to the colon-

  2, this lateral head being intended to be bolted to the electrode arm 4, of which only the end has been shown in the drawing. Furthermore, the metal column 2 is extended at its upper part by two appendages (5, 6). ) hollow and of rectangular section, forming tail-electrode and therefore intended both for the electrical connection of column 2 to 510338 to busbars 7 for feeding electric current and cooling water, a single bar omnibus 7 having been represented in the drawing, and bringing and returning

  cooling water in and out of the metal column 2.

  The electrical connection and the cooling circuit will now be described in greater detail also with reference to FIGS. 2 and 3: As can be seen in the drawings, each busbar 7 has a

  flattened end 70 called pod Each pod such as 70 is per-

  0 longitudinally of a channel 71 of sufficient section to

  to pass the flow of cooling water brought by the channel

  one of the two bus bars 7 The electrical contact between the lug 70 and the corresponding appendix 5 is made by clamping one of the two bus bars 7.

  on the other with eight tie rods 8 and two clamping plates 9.

  The continuity of the hydraulic circuit is ensured for each

  lug-appendix torque by a tube, such as the tube 10 shown,

  the upstream end of channel 50 running through Appendix 5 corresponds to

  laying at the downstream end of the channel 71 traversing the pod 70.

  FIG. 3 shows, purely for descriptive purposes, the conventional circuit in itself, for cooling the metal column 2

  this figure, the circuit traversed by the cooling water is in-

  It is distinguished by arrows.

  bi-frustoconical It enters the upper metal column 2 and the colon

  No. 1 in graphite, this element being also known per se.

Claims (2)

  1 Composite electrode connection and support device   coldie for electric arc furnace, characterized in that it comprises a lateral head (3) adjacent to the upper metal column (2)   electrode and allowing it to be attached to the end of the   electrode (4), in that said metal column is provided at its   upper part of at least one member (5, 6) enabling it to electrically connect   to the bus tubes (7) for supplying electric current and liquid   of cooling, and that it is provided with means (10) for   both to hydraulically connect the hollow inner part of each   tube-bus respectively-at the input and at the output of the cir-   culation of coolant passing inside said metal column.   2 Device according to claim 1, characterized in that said   bodies are hollow metal appendages (5,6) extending the   upper part of said metal column, and that these   these recesses constitute the input and output channels of said circuit of   cooling of the metal column.