JPH0972664A - Water-cooled furnace cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of sparks between an electrode and a water-cooled body at low cost and in light weight structure by mounting a water-cooled body in hollow structure forming an opening on a water-cooled body cover and mounting an insulating refractory material forming an electrode insertion area on the upper part of the water-cooled body. SOLUTION: A water-cooled body 11, which forms a column-shaped opening 11a to be mounted on a cover of a water-cooled body, is formed in hollow structure surrounded with an iron board 21 and cooling water is adapted to flow to this hollow area 31. A solid conductive material 41 is mounted on the upper part of the water- cooled body 11 and there is formed an opening 41a communicating with the opening 11a of the water-cooled body 11 on the conductive material 41 while an insulating refractory material 51, which forms an electrode insertion area 51a, is mounted on the upper part of the conductive material 41. More specifically, the insulating refractory material 51, the conductive material 41 and the water-cooled body 11 are laid out on the same central axis and an electrode 61 is inserted into a furnace by way of the electrode insertion area 51a of the insulating refractory material 51, the opening 451a of the conductive material 41 and the opening 11a of the water-cooled body 11 along this central axis.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water-cooled furnace lid.
When melting or refining a metal material, an arc furnace or a ladle refining furnace provided with a furnace main body, a furnace lid attached to the furnace main body, and an electrode inserted into the furnace from the furnace lid is used. To be done.
The present invention relates to improvement of a water-cooled furnace lid attached to a furnace body such as an arc furnace or a ladle refining furnace.

[0002]

2. Description of the Related Art Conventionally, as a water-cooled furnace lid as described above, a water-cooled body having a hollow structure in which an opening is formed is attached to the furnace lid, and a refractory material molding having a reinforcing plate on the outer surface of the opening is formed A body is attached, an electrode insertion portion is formed in the refractory material molded body, and a space between the lower portion of the inner side surface of the water cooling body facing the opening and the lower portion of the reinforcing plate is filled with castables. It has been proposed (Actual Kaihei 4-132398).
In this water-cooled furnace lid, the electrodes are inserted into the furnace from the electrode insertion portion formed in the refractory material molded body, so that the tubular refractory material molded body as a whole prevents leakage of the gas in the furnace.

However, in the conventional water-cooled furnace lid as described above, the cylindrical refractory material molding is expensive and rich in weight, and in particular, a part of the molten metal scattered during the operation of the furnace is the bottom surface of the water-cooled material. In addition to being adhered to the base material, it also adheres to the castables and the bottom surface of the refractory material molded body, and these gradually grow to have a drawback that a spark is likely to occur between the electrode and the water cooling body. When such a spark occurs, due to this, a hole is formed in the water cooling body, and cooling water leaks from this hole, which may cause a steam explosion.

[0004]

The problem to be solved by the present invention is that in the conventional water-cooled furnace lid, the refractory material molded body is expensive and heavy, and in particular, sparks are generated between the electrode and the water-cooled body. This is an easy point.

[0005]

DISCLOSURE OF THE INVENTION The present invention, however, is a water-cooled furnace lid to be attached to a furnace body, wherein a water-cooled body having a hollow structure in which an opening is formed is attached to the furnace lid. A conductive material having an opening communicating with the opening of the water cooling body is attached to an upper portion of the water cooling body, and the upper surface of the conductive material communicates with the opening of the water cooling body and the opening of the conductive material. The water-cooled furnace lid is characterized in that an insulating refractory material having an electrode insertion portion is attached.

In the present invention, a hollow water cooling body is attached to the furnace lid. This water cooling body is usually formed in a hollow structure surrounded by an iron plate, and cooling water is made to flow in the hollow portion. An opening is formed in the water cooling body. This opening is for inserting the electrode into the furnace through the opening, and the diameter of the opening, that is, the diameter of the inner peripheral surface of the water cooling body forming the opening is larger than the outer diameter of the electrode. It is greatly taken by. This is to prevent sparks from occurring between the electrode and the water cooling body even if a part of the molten metal scattered on the bottom surface or inner peripheral surface of the water cooling body adheres and grows during the operation of the furnace. Even if you make the opening large like this,
As will be described later, there is no problem because the insulating refractory material prevents the gas in the furnace from leaking. In order to more reliably prevent sparks from occurring between the electrode and the water cooling body, it is preferable that the opening of the water cooling body be formed so as to spread downward. The distance between the electrode and the water cooling body is made longer at a portion where a part of the scattered molten metal is fixed and is likely to grow.

An electrically conductive material having an opening communicating with the opening of the water cooling body is attached to the upper portion of the water cooling body. This conductive material may be solid or hollow,
In order to protect the conductive material itself and to make it lightweight at the same time, it is preferable to use a conductive metal tube formed in a ring shape as a whole through which the cooling gas can flow. An insulating refractory material having an opening for the water cooling body and an electrode insertion portion communicating with the opening for the conductive material is attached to the upper portion of the conductive material. This insulating refractory material is for preventing leakage of gas in the furnace. Therefore, the electrode is inserted into the furnace through the electrode insertion portion of the insulating refractory material, the opening portion of the conductive material and the opening portion of the water cooling body.

[0008]

1 is a partial vertical cross-sectional view illustrating a water-cooled furnace lid according to the present invention. A hollow water cooling body 11 is attached to a furnace lid (not shown). The water cooling body 11 is formed in a hollow structure surrounded by an iron plate 21, and cooling water is allowed to flow into the hollow portion 31. Water cooling body 11
A cylindrical opening 11a is formed in the.

A solid conductive material 41 is attached to the upper part of the water cooling body 11, and the conductive material 41 is formed with an opening 41a communicating with the opening 11a of the water cooling body 11, and therefore the conductive material 41 is formed. Is formed in a ring shape as a whole. An insulating refractory material 51 is attached to an upper portion of the conductive material 41, and the insulating refractory material 51 has an opening 11 a in the water cooling body 11.
And the electrode insertion part 5 communicating with the opening 41a of the conductive material 41.
1a is formed, and therefore the insulating refractory material 51 is formed in a ring shape as a whole.

In the case of the water-cooled furnace lid shown in FIG. 1, the insulating refractory material 51, the conductive material 41 and the water cooling body 11 are arranged around the same central axis, and the electrode 61 is arranged along this central axis, and the insulating refractory material is provided. Electrode insertion portion 51a of 51, opening 41 of conductive material 41
a is inserted into the furnace through the opening 11a of the water cooling body 11, but the diameter of the electrode insertion portion 51a is smaller than the diameters of the opening 41a and the opening 11a. A considerable distance is secured between the peripheral surface and the electrode 61.

FIG. 2 is a partial vertical cross-sectional view illustrating another water-cooled furnace lid according to the present invention. A hollow water cooling body 12 is attached to a furnace lid (not shown). The water cooling body 12 is formed in a hollow structure surrounded by an iron plate 22, and cooling water is made to flow into the hollow portion 32. The water cooling body 12 is formed with an opening 12a which spreads downward in the downward direction.

A conductive metal tube 42 through which a cooling gas can flow is attached to the upper part of the water cooling body 12, and the conductive metal tube 42 has an opening 42a communicating with the opening 12a of the water cooling body 12. Therefore, the conductive metal tube 42 is formed in a ring shape as a whole. An insulating refractory material 52 is attached to the upper part of the conductive metal tube 42, and the insulating refractory material 52 has an electrode insertion portion 52a communicating with the opening 12a of the water cooling body 12 and the opening 42a of the conductive metal tube 42. Therefore, the insulating refractory material 52 is formed in a ring shape as a whole.

In the case of the water cooling furnace lid shown in FIG. 2, the insulating refractory material 52, the conductive metal tube 42 and the water cooling body 12 are arranged around the same central axis, and the electrode 62 is arranged along this central axis.
Electrode insertion part 52a of insulating refractory material 52, conductive metal tube 42
Although it is inserted into the furnace through the opening 42a of the water cooling body 12 and the opening 12a of the water cooling body 12, the diameter of the electrode insertion portion 52a is smaller than the diameter of the opening 42a and the opening 12a.
A considerable distance is secured between the electrode 62 and the upper portion of the inner peripheral surface of the water cooling body 12 forming 2a.

Instead of mounting the refractory molded body in the opening of the water cooling body and filling the castable as in the conventional case,
Since a conductive material is attached to the upper part of the water cooling body, and an insulating refractory material for preventing leakage of gas in the furnace is mounted on the upper part of the conductive material, it is inexpensive and lightweight as a whole as compared with a conventional water-cooled furnace lid. In particular, even if some of the molten metal scattered during the operation of the furnace adheres to the bottom surface of the water-cooled body or the inner peripheral surface forming the opening and grows, there is a considerable gap between the inner peripheral surface and the electrode. Therefore, no spark is generated between the electrode and the water cooling body. Some of the molten metal scattered during the operation of the furnace adheres to the inner peripheral surface that forms the openings of the conductive material and the bottom surface of the insulating refractory material, and these may grow and cause sparks. Occurs between the electrode and the water-cooled body, not between the electrode and the grounded conductive material. The sparks do not create holes in the water cooling body. If the conductive material is damaged by the spark, only the conductive material can be easily replaced.

[0015]

As is apparent from the above, according to the present invention described above, the water-cooled furnace lid can be made inexpensive and lightweight as a whole, and in particular, the spark between the electrode and the water-cooled body is prevented to protect the water-cooled body. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view illustrating a water-cooled furnace lid according to the present invention.

FIG. 2 is a partial vertical cross-sectional view illustrating another water-cooled furnace lid according to the present invention.

[Explanation of symbols]

11, 12 ... Water-cooled body, 11a, 12a ... Opening portion, 41 ... Conductive material, 42 ... Conductive metal tube, 5
1, 52 ... Insulating refractory material, 51a, 52a ... Electrode insertion part, 61, 62 ... Electrode

Claims (3)

[Claims] 1. A water-cooled furnace lid attached to the furnace body,
A water cooling body having a hollow structure in which an opening is formed is attached to the furnace lid, and a conductive material having an opening communicating with the opening of the water cooling body is attached to an upper portion of the water cooling body, A water-cooled furnace lid, characterized in that an insulating refractory material having an opening portion of the water cooling body and an electrode insertion portion communicating with the opening portion of the conductive material is attached to an upper portion of the conductive material. 2. The water-cooled furnace lid according to claim 1, wherein the opening of the water-cooled body is formed so as to widen downward. 3. The water-cooled furnace lid according to claim 1, wherein the conductive material is a conductive metal tube formed in a ring shape as a whole through which cooling gas can flow.