Industrial electric heating furnaces – Arc furnace device – Electrode support
Patent
1983-01-13
1986-11-11
Envall, Jr., Roy N.
Industrial electric heating furnaces
Arc furnace device
Electrode support
H05B 710
Patent
active
046226770
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and device for clamping the electrode contact shoes around the electrode of an electric furnace, such as an electric arc furnace.
2. Description of Related Art
The electrodes of electric furnaces are customarily held by means of electrode contact shoes which grip around the electrode and are clamped against the electrode by means of mechanical devices or devices working by fluid.
In many cases the holder accordingly acts also as a contact shoe and thus transmits the electric current. In present practice the number of contact shoes around the electrode is relatively small. The device includes means for mounting at least one continuous pressure element and a plurality of closely spaced electrode contact shoes. This arrangement has been arrived at because the force clamping the contact shoes against the electrode is produced separately for each individual contact shoe.
The clamping force is produced, for example, with the aid of a rubber membrane which is fashioned to fit the contact shoe closely and to which insignificant pressure is applied.
Such rubber membranes, however, are costly to manufacture. Their maintenance and installation are troublesome because each one of them requires its own individual hydraulic unit but nevertheless it is not possible to replace one rubber membrane or contact shoe without dismantling the entire pressure ring system. It has not proved possible to seal the gaps between the contact shoes and consequently the hot furnace gases escape through these gaps so that there is an obvious danger of the rubber membranes becoming burnt. The contact area between the electrode and the contact shoes through which the current is supplied is often quite small compared with the available area, in other words only a line contact is achieved. As the number of contact shoes is small their size in the vertical direction must be correspondingly greater in order that even with only a line contact a sufficient flow of current to the electrode is achieved.
SUMMARY OF THE DISCLOSURE
An object of this invention is to avoid the drawbacks of prior known devices and to provide a method and device by means of which clamping of the contact shoes to the electrode is achieved in a simpler and cheaper fashion and by means of which it is simple to replace a single contact shoe and by means of which the system is made tight. Moreover, by the aid of pressure fluid the cooling of the contact shoes can be arranged easily.
All the above-mentioned advantages are provided by a method and device, the principal characteristics of which are given in the accompanying patent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in more detail with reference to the accompanying drawings, wherein:
FIG. 1 is a horizontal cross-sectional view of an electrode around which are the contact shoes and the pressure element clamping them;
FIG. 2 is a vertical cross-sectional view of the pressure ring system surrounding the electrode;
FIG. 3 is a view of one embodiment of the pressure ring;
FIG. 4 is a vertical cross-sectional view of a pressure ring system employing the pressure element of FIG. 3; and
FIG. 5 illustrates the sealing spring between the contact shoes.
FIG. 6 is a longitudinal cross-section through two adjacent shoes showing the sealing spring of the present invention in more detail.
FIG. 7 is a horizontal cross-section along line 7--7 of FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the device according to the invention the number of contact shoes 2 is increased, and the force clamping the contact shoes to the electrode 1 is achieved by means of a pressure element 3, comprising one part or several parts one above the other, which as one or several uniform rings presses with the same pressure against all the contact shoes.
By means of this uniform pressure element 3 such close contact is obtained between the electrode and the contact shoes that even if the pressure element consists of several parts
REFERENCES:
patent: 2551420 (1951-05-01), Conti
patent: 2758145 (1956-08-01), Bjerkas
patent: 2884475 (1959-04-01), Foyn
patent: 2921108 (1960-01-01), Meffert
patent: 3524004 (1970-08-01), Van Nostran et al.
patent: 3692917 (1972-09-01), Seifert et al.
patent: 4238634 (1980-12-01), Krogsrud
Heikkila Risto M.
Honkaniemi Matti
Jankkila Martti
Rinne Kauko K.
Tuovinen Heikki
Envall Jr. Roy N.
Outokumpu Oy
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