JP2570412Y2 - Plugs such as gas injection nozzles for molten metal containers - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug such as a gas injection nozzle for a molten metal container in the field of metallurgy.

[0002]

2. Description of the Related Art In recent years, in the field of metallurgy, a gas injection nozzle is mounted on the bottom of a furnace of a molten metal container, and a refining gas is blown from the gas injection nozzle to agitate the molten metal. It has been implemented sequentially.

However, when the refining gas is blown from the gas blowing nozzle, as the time elapses, the gas blowing nozzle and the refractories around the gas blowing nozzle are severely worn due to the forced stirring of the molten steel or slag, and the gas blowing nozzle is damaged. Of the molten metal container determines the life.

[0004] Therefore, the inventors have arranged a plurality of gas injection nozzles at the bottom of the furnace of the molten metal container, and initially injected the refining gas with one gas injection nozzle from one place, and to other positions. It has been devised to place an obstruction plug of a blind plug that cannot inject gas. When the gas injection nozzle from one place reaches the end of its life, the predetermined nozzle is sequentially pulled out and replaced with a new gas injection nozzle to perform gas injection. It was also found that the life of the molten metal container could be extended.

[0005]

However, when the above-mentioned gas injection nozzle or plug is plugged into a furnace bottom such as a molten metal container, the thickness of the furnace bottom differs for each molten metal container. However, it was troublesome to attach the gas injection nozzle and the plug to the reference height, and it was not easy to adjust the height.

Further, when the plug is pulled out and replaced with a gas injection nozzle, the refractory of the plug is damaged or easily cut off, and it is difficult to insert or pull out the plug.

[0007]

This invention SUMMARY OF THE INVENTION is intended that in view of the points mentioned above, in order to solve the above problems, the molten
Gas injection nozzles are installed at several locations on the bottom of the metal container
Gas injection nozzle
With a blind plug
Of the gas injection nozzle reaches the end of its life
If so, pull out the predetermined cold plug and inject new gas
Gas injection into a molten metal container used in place of a nozzle
A plug of a nozzle or the like, wherein a metal gas injection narrow tube is buried from the upper end to the lower end in a refractory of a gas injection nozzle for refining provided at the bottom of the molten metal container; A gas introduction pipe is protruded at the lower part of the furnace, a screw is drilled on the outer peripheral surface thereof, and a support ring is screwed onto the screw part so that the mounting height of the gas injection nozzle can be adjusted. Even if the thickness of the bottom part is different, the support ring of the gas introduction pipe below the gas injection nozzle protrudes from the outer wall surface of the furnace bottom of the molten metal container so that the height of the gas injection nozzle is properly located. It is another object of the present invention to provide a plug such as a gas injection nozzle for a molten metal container, wherein the plug is fastened by adjusting a mounting height to a flange portion.

[0008]

According to the invention, a plurality of molten metal containers are provided at the bottom.
Gas injection nozzles should be installed at
Attach a gas injection nozzle to
A blind plug plug is placed in the area where no air is blown,
When the gas injection nozzle reaches the end of its service life,
Pull out the gas and replace it with a new gas injection nozzle.
Can be used as it is blown. The refractory is reinforced by a gas-injection thin tube or metal rod embedded in the refractory of the plug, and the gas injection nozzle and the plugging and refining tool of the plug are inserted and removed without damaging the refractory. be able to. The mounting height of the gas injection nozzle and the plug is determined by drilling a screw into the gas inlet tube and the insertion / removal support rod projecting below the gas injection nozzle and the plug. Can be appropriately adjusted and fixed to a support flange or the like by a support ring. Therefore, there is an advantage that the shape of the nozzle itself can be unified, and the gas injection nozzle can be manufactured more economically.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 and subsequent drawings show an embodiment of the present invention. Refining press
As shown in FIG. 1, the lug gas injection nozzle 1 has a nozzle main body 2 formed of a dense refractory material in an elongated truncated truncated cone shape, and a predetermined diameter is formed in the dense refractory material. A plurality of gas-injection thin tubes 3 of metal thin tubes are buried uniformly. The lower end of the gas injection tube 3 communicates with a gas retaining portion 4 of a circular cylindrical metal box as shown in FIG. The lower portion 5 of the nozzle body 2 is extended, and the gas retaining portion 4 is embedded in the refractory as shown in the figure. A gas introduction pipe 6 of a predetermined length is connected to the lower surface side of the gas retaining portion 4 so that a required inert gas can be blown.

As shown in FIG. 1, a screw 7 is formed on the outer peripheral surface of the gas introducing pipe 6 over substantially the entire length, and two disk-shaped support rings 8 of a predetermined size are formed on the screw 7. 9 is screwed. Insulating materials 10 and 11 such as asbestos plates are attached to opposing surfaces of the support rings 8 and 9, respectively. Lock holes 12 are formed in the lower support ring 9 at intervals of 90 degrees as shown in FIG. 2 so that the lower support ring 9 can be tightened or loosened with a predetermined tightening / loosening tool (not shown). Making it easier.

The gas injection nozzle 1 constructed as described above
As shown in FIG. 3, a tuyere brick 15 of a furnace bottom 14 of a molten metal container 13 such as an electric furnace is inserted into a 15-piece tuyere brick, and a flange 18 of a cylindrical body 17 disposed on an outer wall 16 of a steel shell of the furnace bottom 14. The gas introducing pipe 6 is inserted into the upper and lower supporting rings 8 and 9 so that the flange 18 is sandwiched between the upper and lower supporting rings 8 and 9. At this time, the upper support ring 8 is aligned with the upper surface side of the flange 18 so that the height of the gas injection nozzle 1 is appropriate, and the lower support ring 9 is inserted into the locking hole 12 with a tightening tool. Then, it is fastened and fixed to the lower surface of the flange 18.

As described above, the gas injection nozzle 1 is mounted on the furnace bottom 14 of the molten metal container 13 with its upper end at a predetermined height, for example, at the same height as the upper surface of the furnace bottom 14.
The screw can be fixed by sandwiching the flange 18. Therefore, even if the length of the gas injection nozzle 1 and the thickness of the furnace bottom 14 are slightly different, the gas injection nozzle 1 can be appropriately mounted on the furnace bottom 14. Since the gas injection thin tube 3 is buried in the nozzle body 2, the refractory can be prevented from being damaged.

[0013]

FIG. 4 shows another embodiment of the present invention, which is an embodiment of a blind plug closing plug 19 which can be replaced with the gas injection nozzle 1 described above. The closing plug 19 has the same outer shape as the gas injection nozzle 1 described above, and is formed of a dense refractory. Inside the dense refractory plug body 20, three to five screw rods or metal bars 21 with irregular surfaces such as deformed steel bars or the like are formed by appropriately attaching projections to the metal rods 21. It is buried from the top to the bottom to reinforce the refractory. And these metal rods 2
The lower portion of 1 is firmly fixed by welding or the like to a disk-shaped substrate 22 of a sufficiently rigid metal material provided on the bottom of the plug body 20.

A metal insertion / removal support rod 24 having a screw 23 perforated over the entire outer peripheral surface as shown in the drawing is attached to the lower surface of the substrate 22 by welding via a fixing material 25. 24 to plug the plug 13 into the molten metal container 13.
At a predetermined position or withdrawn.
The outer peripheral surface of the closing plug 19 is covered with a metal coating plate 26, and the supporting rings 27 and 28 are the same as those of the gas injection nozzle 1 described above.

Also in this embodiment, the support rings 27 and 28 screwed to the insertion / removal / removal support rods 24 projecting from the lower part of the closing plug 19 are attached to the flange so as to be adjustable in height. The refractory can be strengthened by the rod 21 and the outer shape of the refractory can be held by the metal coating plate 26 coated on the outer peripheral surface.

In particular, in this embodiment, the refractory can be strengthened by the metal rod 21 embedded in the plug main body 20 of the plug 19, so that the plug main body is not cut off when the plug 19 is pulled out. It is preferable to pull it out.

The above-mentioned gas injection nozzle and plug were plugged in three places at the bottom of the electric furnace of Company A. As a result, the height can be adjusted to the flange part protruding from the outer wall with the gas introduction pipe protruding from the lower part and the support ring screwed to the insertion / removal support rod, and it can be easily attached to the desired height. Was completed.

[0018] In the above, it has been described an electric furnace, even with the gas blowing nozzle or clogging plug of molten metal containers require other refining, can be applied similarly.

[0019]

[Effects of the Invention] As described above, in the present invention, molten metal
Arrange gas injection nozzles at multiple locations at the bottom of metal containers
In this way, the gas injection nozzle is
Attach the blind plug to other parts that are not
Install a plug to ensure that the gas injection nozzle reaches its end of life.
If a predetermined plug is sequentially pulled out, a new gas is blown
Use it in such a way that gas is blown in
Can be. Then, plug in the gas injection nozzle or plug
Even if the length and the thickness of the furnace bottom of the molten metal container are different, the flange portion of the outer wall so that it will be at the appropriate height with a support ring screwed to the gas introduction pipe and insertion / removal support rod protruding below And can be mounted at a predetermined position of the molten metal container. Therefore, the shape of the gas injection nozzle is unified, and the gas injection nozzle can be manufactured more economically. Moreover, the plug
Buried metal gas blown tubing or metal rod in refractory
As a result , the gas injection nozzle and the plug can be inserted into and removed from the molten metal container without losing the refractory.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention;

FIG. 2 is a bottom view of the above support ring,

FIG. 3 is a side sectional view for explanation of a state of being attached to the above molten metal container,

FIG. 4 is a side sectional view of another embodiment of the above.

[Explanation of symbols]

1. Gas injection nozzle 3. Gas injection capillary 4.
... gas retaining part 6 ... gas introduction pipe 7 ... screw 8, 9
... support ring 13 ... molten metal container 14 ... furnace bottom 17,1
8 Flange 19 Closure plug 21 Metal rod 2
3: Screw 24: Insertion / removal support rod 27, 28: Support ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Usaka 1576, Higashi-oki, Aki City, Hyogo Prefecture 2 Kawasaki Reactor Co., Ltd. (56) References JP-A-62-214121 JP-A-63-69907 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] 1. A gas blower at a plurality of locations on the bottom of a molten metal container.
Gas nozzle so that the gas
Attach a gas injection nozzle to inject other gas
Placing blind plugs in blind spots and blowing gas
When the nozzle reaches the end of its service life, pull out the specified plug
And replace with a new gas injection nozzle to inject gas
To use the gas injection nozzle of the molten metal container
Then , a metal gas injection narrow tube is buried from the upper end to the lower end in a refractory of a gas injection nozzle for refining provided at the bottom of the molten metal container, and gas is introduced into a lower portion of the gas injection nozzle. as well as bored screw on its outer peripheral surface projecting tube, and screwed to the support ring adjustably the threaded portion of the mounting height of the gas blowing nozzle, the thickness of the furnace bottom portion of the molten metal container Even if they are different, attach the support ring of the gas introduction pipe below the gas injection nozzle to the flange protruding from the outer wall of the furnace bottom of the molten metal container so that the height of the gas injection nozzle is properly positioned A gas injection nozzle for a molten metal container, the height of which is adjusted for fastening. 2. A gas blower at a plurality of locations on the bottom of the molten metal container.
Gas nozzle so that the gas
Attach a gas injection nozzle to inject other gas
Placing blind plugs in blind spots and blowing gas
When the nozzle reaches the end of its service life, pull out the specified plug
And replace with a new gas injection nozzle to inject gas
Closed for gas injection of molten metal container used in this way
A plug, blind gas blowing nozzle clogging plug of the plug to replace the gas blowing nozzle for refining disposing on the bottom of the molten metal container
And the same shape as the refractory
A metal rod that can be strengthened is buried from the upper part to the lower part, and an insertion / removal support rod is protruded from the lower part of the plug and a screw is drilled on its outer peripheral surface, and the mounting height of the plug is adjustable. a screwed support ring to the threaded portion, soluble be different thickness of the furnace bottom portion of the fusion metal container, supporting the lower portion of the insertion and removal support rod of the closing plug so that the height of the closure plug is positioned properly A plug for blowing gas into a molten metal container, wherein the ring is attached to a flange portion protruding from an outer wall surface of a furnace bottom of the molten metal container so as to be tightened by adjusting its height.