JPH0714352Y2 - Tilt-type molten metal furnace - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a tilting molten metal furnace, and more particularly to melting of metal,
A furnace used for refining or smelting reduction, in a molten metal furnace (electric furnace, converter, various refining furnaces, etc.) in which the furnace body is tilted around a horizontal tilt spindle, Regarding the improved ones.

[Prior art]

In the above molten metal furnace, various toxic or harmful gases are generated during operation, so the furnace opening of the molten metal furnace has a function as a duct for guiding the gas to an external gas treatment facility or the like. The throat head is separably abutted.

For example, in the case of a converter, a furnace mouth head is detachably abutted on the furnace mouth of the furnace body. The upper end of the furnace opening is horizontal during operation. Then, a lance for blowing oxygen gas and a sub-lance for sampling are attached to the furnace port head in a penetrating manner, and a chute for feeding a raw material is also attached.

An elevating skirt structure is provided in the lower part of the furnace mouth head for contact with the furnace body, and when the furnace body tilts, the skirt structure is raised to separate the furnace mouth head from the furnace body. The furnace body is tilted in this state (for example, Japanese Examined Patent Publication No. 62-20255).

[Problems to be solved by the device]

In a conventional molten metal furnace, since the upper end of the furnace opening is horizontal during operation, the interference between the furnace opening of the furnace body and the furnace head increases when the furnace body tilts. Therefore, it is necessary to provide an elevating skirt structure on the furnace mouth head side and move the furnace mouth head sideways or upward while the skirt structure is raised, and the structure of the furnace mouth head is extremely large. It is complicated and the manufacturing cost is high, which is very disadvantageous in terms of equipment cost.

An object of the present invention is to provide a tilting type molten metal furnace in which interference between the furnace body and the furnace mouth head does not occur when the furnace body is tilted.

[Means for Solving the Problems]

The tilting type molten metal furnace according to the present invention comprises a furnace mouth head,
In a tilting type molten metal furnace capable of tilting about a horizontal tilting support shaft, from the surface determined by the point forming the maximum tilting radius on the side opposite to the tilting direction of the upper end of the furnace opening and the axis of the tilting support shaft, The angle to the upper end surface of the furnace opening is formed to be 90 ° or more so that interference with the furnace head does not occur when the furnace body is tilted.

[Action]

In the tilting type molten metal furnace according to the present invention, the angle from the plane defined by the axis and the point forming the maximum tilting radius on the side opposite to the tilting direction of the upper end of the furnace opening to the upper end surface of the furnace opening is determined. Since it is formed at 90 ° or more so as not to interfere with the furnace mouth head when tilting the furnace body, the tilting locus of the point that forms the maximum tilting radius is the furnace mouth that abuts the furnace mouth part. Since it is located below the lower end surface of the head, interference between the furnace body and the furnace mouth head does not occur when the furnace body is tilted back and forth.

[Effect of device]

According to the tilting type molten metal furnace of the present invention, the above [action]
As described in the above section, when the furnace body is tilted reciprocally, the interference between the furnace body and the furnace mouth head does not occur.

Therefore, the structure of the contact portion between the furnace mouth head and the furnace body can be remarkably simplified, and the device or mechanism for moving the furnace mouth head can be omitted, downsized, or simplified, and the equipment can be simplified. It is extremely economically advantageous.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is an example of the case where the present invention is applied to a converter.

As shown in FIG. 1, the converter 1 basically comprises a furnace body 10 and
A furnace port head 20 that is detachably abutted on the furnace port 11 is provided.

The furnace body 10 has a structure in which a refractory material 13 is lined inside a steel shell 12, a furnace opening 11 is formed at the upper end of the furnace body 12, an annular furnace account 14 is provided, and one side is melted after refining. A tap hole for discharging metal is provided. The furnace body 10 is held by a trunnion ring 15, and a pair of horizontal tilt support shafts 16 are fixed to the trunnion ring 15. Each tilt support shaft 16 is supported by a bearing structure (not shown), and the furnace body 10 is a pair of front and rear. Tilting spindle
It is adapted to be reciprocally tilted around the operating posture shown by the solid line in the figure and the tilting posture shown by the two-dot chain line with the center at 16.

The furnace port head 20 includes a cylindrical peripheral wall portion 21 formed by lining a steel 22 with a refractory material 23, and a skirt structure 24 including an elastic sleeve at the lower portion of the peripheral wall portion 21.

The furnace head 20 has a lance for supplying oxygen gas.
25, a sampling sublance, and a chute for feeding raw materials are attached.

At the start of refining, scrap and hot metal are put into the furnace body 10 and then the furnace head 20 is contacted, oxygen is supplied from the lance 25 to perform refining, and the generated gas is externally supplied through the furnace head 20 which is a gas duct. Leading to gas treatment equipment. In this way, molten steel is tapped from the tap hole after refining. The refractory material 13 is often repaired after tapping is completed.

Here, the structure of the furnace opening 11 of the furnace main body 10 and its peripheral portion will be described. It is necessary to tilt the furnace main body 10 in order to introduce the hot metal and repair the refractory material 13.

In order to prevent the upper end of the furnace opening 11 and the lower end of the furnace opening head from interfering with each other during the tilting, a point A having a maximum tilt radius on the side opposite to the tilting direction shown by the arrow K and the tilt support shaft are arranged so as not to interfere with each other.
The angle γ from the surface P1 determined by the axis J of the 16 to the upper end surface P2 of the furnace opening 11 is formed to be 90 ° or more, and when the furnace body 10 is tilted, the interference between the furnace body 10 and the furnace head 20 Will not occur.

That is, when the angle of attack of the upper end surface P2 of the furnace opening 11 from the horizontal plane is β and the angle between the surface P1 and the vertical line is α, β ≧ α
Is set so that

In this way, since the inclination angle and direction of the upper end surface P2 of the furnace opening 11 are set, when the furnace body 10 is tilted in the tilting direction, the upper end of the furnace opening 11 is far from the lower end of the furnace opening head 20. Since it moves in the direction, there is no interference. Therefore, there is no interference even when tilting in the return direction.

However, since the position of the upper end of the furnace opening 11 slightly fluctuates due to thermal expansion and contraction of the furnace body 10, an expansion sleeve (expansion sleeve) or the like is added to the skirt structure of the furnace opening head 20 to absorb this. It is desirable to incorporate it.

As a modification of the above, as shown in FIG.
Is the eccentricity Ja with respect to the axis J, the above conditions are the same, and the tilting locus of the point A forming the maximum tilting radius is located below the lower end of the throat head 20. The angle γ in the figure shall be set to 90 ° or more. The other points are the same as above.

Needless to say, the present invention can be similarly applied to various tilting type molten metal furnaces (furnace furnace, smelting furnace, smelting reduction furnace, etc.) with a furnace head other than the converter 1.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a converter, and FIG. 2 is a view corresponding to FIG. 1 ... Converter, 10 ... Furnace body, 11 ... Furnace mouth, 16 ... Tilt support shaft, 20 ... Furnace mouth head.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshio Uchiyama 3-1, 1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Kawasaki Heavy Industries Ltd. Kobe factory (72) Kenichi Yajima Higashi-kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture 3-1, 1-1 Kawasaki Heavy Industries, Ltd. Kobe factory (72) Ken Ken Takiura 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Yukihiko Takaza Hyogo 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor, Sumio Sato 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Prefecture Kawasaki Heavy Industries, Ltd., Kobe factory

Claims (1)

[Scope of utility model registration request] 1. A tilting type molten metal furnace equipped with a furnace mouth head and capable of tilting about a horizontal tilting support shaft, wherein a tilting point and a point forming a maximum tilting radius on the side opposite to the tilting direction of the upper end of the furnace mouth part. The angle from the plane determined by the axis of the support shaft to the upper end surface of the furnace opening is formed to be 90 ° or more so that it does not interfere with the furnace opening head when tilting the furnace body. A tilting type molten metal furnace that features.