DE421993C - Electrode introduction for arc furnaces - Google Patents

Description

GERMAN EMPIRE

ISSUED ON NOVEMBER 21, 1925

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21h GROUP (S58610

Siemens & Halske Akt-Ges. in Berlin-Siemensstadt *).

Electrode entry for electric arc furnaces. Patented in the German Empire on January 15, 1922.

The invention relates to a sealing device for the insertion point of electrodes on arc furnaces. There are already a large number of in this direction Proposals have been made with the aim of avoiding the exit of the furnace gases at the point of introduction and thus on the one hand the Destruction · of the electrode surface at this point and also the strong burn-off of the ίο to prevent electrodes from entering the furnace chamber as a result of oxygen. It is for example been proposed to use the electrodes at a relatively large distance to surround a cooling cylinder, which at both ends by means of flexible rings against the Electrode is sealed. This cooling cylinder is of one with the clamping device for the electrode connected to the bell surrounding the electrode in a gas-tight manner, which in turn is sealed against the outer wall of the cooling cylinder by an elastic intermediate layer. Using spindles the electrode and the bell can be moved, whereby the entire adjustment

*) The patent seeker stated as the inventor:

Walther Mareth in Charlottenburg.

device is arranged within a further, outer cylinder. The facility has the disadvantage that the individual sealing points are so inaccessible, that if damaged, the entire insertion device including the fixed Cooling cylinder must be dismantled. According to the invention, this drawback is eliminated in that the electrode directly surrounding cooling cylinder these fit relatively well, but without sealing on the other hand surrounds and the bell attached to the electrode holder against a gas-tight connected to the cooling cylinder The jacket is sealed by a stuffing box that is easily accessible from the outside. These Sealing can be further improved if the bell is at its free edge is provided with an externally adjustable sealing device, which is on the one hand against the cooling cylinder, on the other hand against the jacket and thus the furnace gases prevents direct contact with the stuffing box.

With the new facility, all of the sealants are readily available from the outside adjustable. The outer stuffing box is used for changing the packing material easily accessible; for the replacement of the inner sealing ring needs a solution of the stuffing box, the bell is only pulled up accordingly.

In the drawing, an embodiment of the subject matter of the invention is shown, namely show Fig. 1 partly a view, partly a longitudinal section through the insertion device, Fig. 2 a detail also in longitudinal section and enlarged Scale.

The electrode is e d ο passed through this through an opening in the furnace roof and is held k of a clamping device that is attached to a t-adjustable in the direction of the electrode axis support arm. A sealing plate / and on top of it a layer of insulating material / is initially arranged on the furnace roof, against which a cooling cylinder ζ rests, which is held by an outer supporting structure r . The cooling cylinder is also connected to the supporting structure with an intermediate layer of insulation material. In this way, a ground fault from the electrode via the cooling cylinder and the supporting structure is avoided. The cooling cylinder surrounds the electrode as closely as possible. A bell g is arranged above it, which is attached to the clamping device k for the electrode in such a way that it adjoins this in a gas-tight manner. The bell is provided with two walls W ₁ , W ₂ and in turn moves in an outer jacket m; this is formed at its upper end into a stuffing box b , the sealing material d _{x of} which rests against the outer bell wall W ₁ . The lower edges of the cylindrical walls W ₁ , w « are stiffened against one another and each provided with a sealing ring r _v r ₂ attached to it, as Fig. 2 shows particularly. Below these sealing rings, ring packings P ₁ , p _z are arranged, which are pressed against the outer jacket m and the outer wall of the cooling cylinder ζ by a pressure ring d% with conical surfaces. The pressure ring d ₂ is held by a number of tensioning screws s distributed around the circumference. When the nuts ti arranged on the top of the bell g are tightened, the pressure ring d _{2 is} lifted and the packs p _v P _{2 are} pressed against their abutments.

Claims (4)

Patent Claims: i. Electrode entry for electric arc furnace with fixed cooling cylinder surrounding the electrode and gas-tight fastened to the electrode carrier, against the Bell sealed on the outside of the cooling cylinder, characterized in that the cooling cylinder without a seal surrounds the electrode as closely as possible and is surrounded by a fixed jacket in which the bell means a stuffing box accessible from the outside. 2. Electrode inlet according to claim i, characterized in that the bell is provided with an externally adjustable sealing device, . which seals it against both the cooling cylinder and the jacket. 3. electrode inlet according to claim 2, characterized in that the Bell is double-walled and in the annular space extending to the outside of the bell clamping screws are provided, the packing material of the sealing device by means of a pressure ring press adjustable against the walls. 4. electrode inlet according to claim i, characterized in that the stationary parts for sealing and cooling the electrode are attached in an insulated manner. 1 sheet of drawings.