JP3087603B2 - Nozzle hole clogging lance for molten steel discharge from ladle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lance for removing nozzle hole clogging, which is used when a sliding opening and closing device for discharging molten steel attached to the bottom of a ladle used in a steel making process of an ironworks causes nozzle hole clogging. .

[0002]

2. Description of the Related Art As shown in FIG.
, A rotary steel nozzle 3 is mounted. Rotary nozzle 3 is upper nozzle 3
a, a fixed plate (bottom plate) 3b, a sliding plate (slide plate) 3c, and a collector nozzle 3d.

When the ladle receives molten steel 2, the sliding plate 3c is closed, sand is introduced from the upper inside of the ladle, and the ladle is inserted into the nozzle hole between the fixed plate 3b and the upper nozzle 3a. Keep sand filled. After receiving the steel, the sliding plate 3 is discharged to the casting tundish 6 through the air seal pipe 7 to discharge the molten steel 2.
Open c. At this time, the sand or the solidified material 5 of the molten steel in the nozzle hole may clog the nozzle hole for some reason, and the clogged material 4 may not allow the molten steel 2 to be discharged.

In such a case, conventionally, FIG.
As shown in (1), the air seal pipe 7 is removed, and a cleaning lance 9 in which the end side of the cleaning oxygen pipe 8 is bent into an L-shape is inserted upward from the lower end of the collector nozzle 3d. Operate the oxygen supply valve 12 from above,
Supplying oxygen, igniting the clog 4 and cleaning the inside of the nozzle hole with oxygen are performed.

Further, as shown in FIG. 9, an oxygen cleaning lance disclosed in Japanese Patent Publication No. 54-41540 (referred to as prior art 2) is inserted into a cleaning-side end straight pipe 10 to ignite the tip. The cleaning lance 11 equipped with the agent 13 is slid up along the inner surface of the cleaning-side end straight pipe 10 by the pressure of the supplied oxygen to remove the clogs 4 such as sand in the rotary nozzle 3 as shown in FIG. Oxygen cleaning is performed by firing the adhesive.

[0006]

However, the oxygen cleaning according to the prior art 1 has the following problems. Since the position of the coagulated material 5 or the like that needs cleaning is about 1000 mm above the lower end of the collector nozzle 3d, the length of the cleaning lance 9 naturally needs to be longer than this.

A gap between the upper surface of the tundish 6 and the lower end of the collector nozzle 3d of the ladle 1 (gap of about 500 to 600)
mm) was narrow, and the work was extremely difficult. If this operation cannot be performed in a short time, the casting operation must be interrupted, and the molten steel 2 in the ladle 1 must be subjected to emergency treatment, resulting in a very large loss.

The cleaning lance 11 disclosed in the prior art 2 facilitates the work of inserting the cleaning-side end straight pipe 10 from the gap between the upper surface of the tundish 6 and the lower surface of the collector nozzle 3d, and at the same time from the start of cleaning. The time to clear the clog was shortened. However, as shown in FIG. 9, the cleaning lance 11 uses a single tube as it is,
Since oxygen is supplied by adjusting the flow rate by an oxygen supply valve (not shown), the cleaning lance 11 is raised in the cleaning-side end straight pipe 10 and inserted into the rotary nozzle 3 to further reach the coagulated material and the like. To do so requires an excess oxygen flow rate. For this reason, a case occurs where the coagulated material or the like is cooled and does not ignite.

On the other hand, if the oxygen flow rate is set low to ensure ignition, the cleaning lance 11 does not rise, or even if it rises, the cleaning lance 11 cannot be pressed against the solidified material 5 with a certain force. It does not ignite because the heat required for ignition is not obtained.

A cleaning lance 11 and a cleaning-side end straight tube 1 are also provided.
A gap is formed between the inside and the inside, and oxygen leaks out from the tip of the cleaning-side end straight pipe 10. Therefore, when the coagulated matter or the like dissolved in the oxygen cleaning adheres to the tip of the cleaning-side end straight pipe 10, it reacts with the outflowing oxygen and generates heat, and the cleaning-side end straight pipe 10 and the cleaning lance 11 are melted and the life is shortened. shorten. Therefore, appropriate oxygen cleaning cannot be performed.

In the prior art 1 and the prior art 2, when the clogging material 4 is washed and removed and the molten steel 2 starts to be discharged, the rotary nozzle 3 is closed once to prevent the molten steel being discharged from being oxidized. Must be installed. During the installation of the air seal pipe 7, the molten steel 2 solidified again, and the nozzle hole was sometimes clogged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to surely wash coagulated matter and the like in a rotary nozzle with an appropriate oxygen flow rate and to prevent clogging in the rotary nozzle. Even if the material is a low heat material such as sand or a non-flammable material, it can be reliably removed and the nozzle hole for ladle molten steel discharge can be removed with the air seal pipe attached. The purpose is to provide a lance.

[0013]

According to the present invention, there is provided an air seal pipe which can be installed below a ladle molten steel discharging nozzle, and a cleaning side of a cleaning oxygen pipe which is contained in the air seal pipe. A straight lance outer tube provided at the end,
Clogged nozzle hole for ladle molten steel discharge composed of a cleaning lance that is inserted into the inside of the outer tube of the lance so as to be able to move up and down, is equipped with an ignition agent at the tip, and has an oxygen pressure receiving plate with an oxygen vent at the rear end. It is a removal lance.

According to a second aspect of the present invention, there is provided an air seal pipe which can be installed below a ladle molten steel discharge nozzle, and a straight pipe which is included in the air seal pipe and which is provided at a cleaning side end of a cleaning oxygen pipe. A lance outer tube, a foreign matter removal lance which is inserted into the lance outer tube so as to be movable up and down, has a protruding end at the tip, has an oxygen vent at the rear end, and is provided with an oxygen pressure receiving plate, It is inserted inside the removal lance so that it can move up and down,
This is a lance for removing molten iron from a ladle for discharging molten steel, comprising: a cleaning lance having an ignition agent mounted at the tip and an oxygen pressure receiving plate having an oxygen vent at the rear end.

According to a third aspect of the present invention, there is provided an air seal pipe which can be installed below a ladle molten steel discharge nozzle, and which is included in the air seal pipe and branches to a cleaning side end of a cleaning oxygen pipe. The first lance outer tube and the second lance outer tube of the provided straight tube are inserted into the first lance outer tube so as to be able to move up and down, an igniting agent is mounted at the tip, and oxygen is passed through the rear end. A cleaning lance provided with an oxygen pressure receiving plate having pores, and a rising lance inserted into the second lance outer tube so as to be able to move up and down, a tip end provided, and an oxygen ventilation hole provided at a rear end; And a foreign matter removal lance provided with a nozzle.

In the lance for removing molten steel from a ladle according to the first, second or third aspect of the present invention, an oxygen amount adjusting plate having an oxygen ventilation hole is provided at the tip of the cleaning lance. It is.

Further, the above-mentioned claim 1, claim 2, and claim 3
Alternatively, in the lance for removing ladle molten steel from the nozzle hole clogging removal lance according to the present invention, the oxygen pressure receiving plate is provided with packing between the lance outer tube and the lance outer tube.

[0018]

According to the first aspect of the present invention, since an air seal pipe including a cleaning lance or the like is provided below the ladle molten steel discharging nozzle, oxygen is supplied to the cleaning oxygen pipe. After being sent, the pressure of the oxygen received by the oxygen pressure receiving plate raises the cleaning lance provided inside the outer tube of the lance and is inserted into the ladle molten steel discharge nozzle to reach the solidified material in the nozzle. Then, the igniting agent pressed against the high-temperature solidified material ignites, and oxygen cleaning is performed.

According to the second aspect of the present invention, as described above, when oxygen is supplied to the cleaning oxygen pipe, foreign matter is removed while the cleaning lance is built in by the pressure of the oxygen received by the oxygen pressure receiving plate. The lance is raised and inserted into the ladle molten steel discharge nozzle. The tip of the foreign matter removing lance collides with the clogging material in the nozzle and breaks down hardened sand and the like, penetrates deeply into the clogging material, and blows out oxygen to remove the broken sand and the like. When the foreign matter removal lance reaches the solidified material and stops moving, the cleaning lance presses the igniting agent against the high-temperature solidified material to ignite, and oxygen cleaning is performed.

According to the third aspect of the present invention, since oxygen is supplied to the cleaning oxygen pipe, the oxygen is introduced into the branched first and second lance outer pipes. The foreign matter removing lance and the cleaning lance are both raised by the pressure of oxygen received by the oxygen pressure receiving plate, and inserted into the ladle molten steel discharge nozzle. The tip of the foreign matter removal lance collides with the clogging in the nozzle and breaks down hardened sand, etc., penetrates deeply into the clogging, and blows out oxygen to remove the broken sand, etc. To reach.

At the same time, the cleaning lance easily reaches the solidified matter. Then, the igniting agent pressed against the high-temperature solidified matter ignites, and oxygen cleaning is performed.

[0022] In the lance for removing molten steel from the ladle for clogging the nozzle hole according to the first, second or third aspect of the present invention, an oxygen amount adjusting plate having an oxygen vent hole is provided at the tip of the cleaning lance. By adjusting the ignition flow rate, the initial oxygen flow rate by the cleaning lance is flowed at a low flow rate to reliably ignite the igniting agent and to dissolve the igniting agent. After the igniting agent melts, the oxygen amount adjusting plate subsequently melts and disappears, and the oxygen flow rate required for oxygen cleaning is supplied through the ventilation hole of the oxygen pressure receiving plate provided at the lower end of the cleaning lance.

Further, the above-mentioned claim 1, claim 2 or claim 3
In the lance for removing molten steel from the nozzle hole clogging removal lance according to the present invention, since the oxygen pressure receiving plate provided at the lower end of the cleaning lance is provided with packing between the lance outer tube and the oxygen pressure receiving plate and the lance outer tube, There is no leakage of oxygen from between.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention according to claim 1. FIG. 2 is a partial cross-sectional view showing a state in which the lance of the present invention is mounted on a ladle molten steel discharging nozzle. 8 and 9 are denoted by the same reference numerals.

In FIG. 1, reference numeral A denotes a lance for removing molten iron from a ladle for discharging molten steel in a ladle according to the present invention. Reference numeral 17 denotes a straight lance outer pipe provided at the cleaning side end of the cleaning oxygen pipe 8.
The outer lance tube 17 is contained in the air seal pipe 16. Here, one of the cleaning oxygen supply pipes 8 bent into a U-shape is inserted into the air seal pipe 16, and this is used as the lance outer pipe 17.

Reference numeral 18 denotes a cleaning lance which is inserted into the outer lance tube 17 so as to be able to move up and down. That is, the lance outer tube 17
A tube with an outer diameter slidable along the inner surface of the tube is inserted and used. The cleaning lance 18 has the ignition agent 13 mounted at the tip,
And an oxygen pressure receiving plate 1 having an oxygen vent hole 14a at its rear end.
4 are provided.

As the igniting agent 13, iron oxide (Fe
It is possible to use a mixture of ₂ O ₃ ), metal aluminum, potassium chlorate, or the like impregnated with oil or the like filled in a metal mesh-containing rubber hose.

An orifice 20 is provided at the tip of the cleaning lance 18 at the position where the igniting agent 13 is burned off, as an oxygen amount adjusting plate for reducing the oxygen flow rate.

The oxygen pressure receiving plate 14 is a disk-shaped plate having a small oxygen vent hole 14a, which is designed so that when the igniting agent 13 and the orifice 20 are dissolved in the oxygen cleaning, the oxygen flow rate is increased. It is.

Incidentally, the oxygen pressure receiving plate 14 is
e is attached so that the lance outer tube 17 can slide while being sealed.

Next, the method of using the lance of the present invention is shown in FIG.
It will be described in detail based on. If the molten steel 2 cannot be discharged even when the ladle 1 is set on the tundish 6 and the rotary nozzle 3 is opened, the air seal pipe attached to protect the quality of the molten steel 2 is first removed and the air seal including the present invention is removed. Attach pipe 16.

Air Seal Pipe 16 Including the Present Invention
Is a lance outer pipe 17 in a normal air seal pipe in advance,
The cleaning lance 18 and the like are integrally incorporated, and then the cleaning oxygen supply pipe 8 is connected to the rotary nozzle 3.
Is opened, and an oxygen supply valve (not shown) is opened to feed oxygen into the cleaning oxygen supply pipe 8. When the oxygen is supplied, the cleaning lance 18 inside the lance outer pipe 17 incorporated in the air seal pipe 16 is raised by receiving the pressure of oxygen from the oxygen pressure receiving plate 14 and inserted into the rotary nozzle 3, and And the like. At this time, the clogs 4 are crushed and are sequentially removed by oxygen blown from the tip. The cleaning lance 18 rises and reaches the solidified material 5, and the igniting agent 13 at the tip is pressed against the high-temperature solidified material 5 to ignite.

In this case, the cleaning lance 18 is provided with the igniting agent 13 and the orifice 20 at the tip, thereby suppressing the amount of oxygen at the orifice 20 to an appropriate amount, preventing ignition failure caused by cooling of the coagulated material 5, and An appropriate amount of oxygen can be flowed until 13 is dissolved. Orifice 20 is ignition agent 1
3 is provided at a position where the erosion is completed.
After completion of the erosion, the orifice 20 is also eroded and automatically shifts from the ignition oxygen flow rate to the cleaning oxygen flow rate. This ensures that the solidified matter 5 in the rotary nozzle 3 is removed.

FIG. 3 is a longitudinal sectional view of one embodiment of the present invention according to claim 2. Reference numeral 17 denotes a straight lance outer pipe provided at the cleaning side end of the cleaning oxygen pipe 8.

Reference numeral 19 denotes a foreign matter removal lance which is inserted into the lance outer tube 17 so as to be movable up and down. That is, the lance outer tube 1
7, a tube having an outer diameter slidable along the inner surface is inserted and used.

The distal end portion 19a of the foreign matter removing lance 19 has a sharp pointed shape, and an oxygen pressure receiving plate 14c having an oxygen vent hole 14b is provided at the rear end to provide a propulsive force. The penetration and the release of oxygen from the tip remove the unsintered, low heat plug.

Inside the foreign matter removal lance 19, a cleaning lance 18 having an ignition agent 13 mounted at the front end and an oxygen pressure receiving plate 14 having an oxygen vent hole 14a at the rear end is inserted vertically. .

The cleaning lance 18 is provided with a paper sleeve 15 on its outer surface and is shielded from oxygen and heat, so that the cleaning time is maintained longer and the cleaning effect is further enhanced.

FIGS. 4 (a), 4 (b) and 4 (c) are longitudinal sectional views showing the progress of the removal of clogs by using the lance according to the second aspect of the present invention.

In FIG. 4A, the air seal pipe 16 of the present invention is connected to the collector nozzle 3 of the rotary nozzle 3.
Connect to d.

Next, the cleaning oxygen supply pipe 8 is connected, the sliding plate 3c is slid on the fixed plate 3b to open the rotary nozzle 3, and the oxygen supply valve 12 (not shown) is opened to wash oxygen. Into the supply oxygen supply pipe 8. When the oxygen is supplied, as shown in FIG. 4B, the foreign matter removing lance 19 and the cleaning lance 18 receive the oxygen pressure from the oxygen pressure receiving plate 14c and the oxygen pressure receiving plate 14, respectively, and move upward to rotate the rotary nozzle 3. It collides with a clog 4 such as sand generated inside.

At this time, since the tip of the foreign matter removing lance 19 has a sharp pointed shape, the clogging material 4 such as sand is crushed and is sequentially removed by oxygen blown from the tip, as shown in FIG. The foreign matter removal lance 19 reaches the solidified matter 5. At the same time, the cleaning lance 18 also rises and reaches the solidified material 5, and the igniting agent 13 at the tip is pressed against the high-temperature solidified material 5 to ignite. Since the cleaning lance 18 is provided with the igniting agent 13 at the tip and the orifice 20 therebelow,
After the igniting agent 13 is eroded, the orifice 20 subsequently erodes and disappears, and the oxygen flow automatically shifts from the ignition oxygen flow to the cleaning oxygen flow.

Thus, the solidified matter 5 in the rotary nozzle 3 is reliably removed. FIG. 5 is a longitudinal sectional view of an embodiment of the present invention according to claim 3.

Reference numerals 17a and 17b denote first and second lance outer pipes which are branched and provided at the cleaning-side end of the cleaning oxygen pipe 8.

Reference numeral 19 denotes a foreign matter removing lance, which is inserted into the first lance outer tube 17a so as to be movable up and down. That is, a tube having an outer diameter slidable along the inner surface of the outer lance tube 17a is inserted and used. The foreign matter removing lance 19 is provided with a protruding end 19a at the front end and an oxygen pressure receiving plate 14c having an oxygen vent hole 14b at the rear end.

The tip of the foreign matter removing lance 19 has a sharp pointed shape, has an oxygen vent hole 14b at the rear end, and is provided with an oxygen pressure receiving plate 14c to provide propulsive force, so that it penetrates deeply into the clogged material. In addition, since oxygen is emitted from the tip, low-temperature clogs that have not been sintered can be removed.

Numeral 18 denotes a cleaning lance, which is a first lance outer tube 17b.
It is inserted into the inside of the device so that it can move up and down. That is, a tube having an outer diameter slidable along the inner surface of the lance outer tube 17b is inserted and used. The cleaning lance 18 is provided with an ignition agent 13 at the front end and an oxygen pressure receiving plate 14 having an oxygen vent hole 14a at the rear end.

If the paper sleeve 15 is mounted on the outer surface of the cleaning lance 18 and shielded from oxygen and heat so that the cleaning time can be maintained longer, the cleaning effect can be further enhanced.

Next, the operation of the lance for removing molten metal from the ladle in the present embodiment will be described with reference to FIGS. 6 (a), 6 (b) and 6 (c). The air seal pipe 12 of the present invention is connected to the collector nozzle 3d of the rotary nozzle 3.

Next, the cleaning oxygen supply pipe 8 is connected, the rotary nozzle 3 is opened, and an oxygen supply valve 12 (not shown) is opened to feed oxygen into the cleaning oxygen supply pipe 8. When the oxygen is supplied, as shown in FIG. 6A, the foreign matter removing lance 19 and the cleaning lance 18 receive the oxygen pressure from the oxygen pressure receiving plate 14c and the oxygen pressure receiving plate 14, respectively, and the lance outer tube 17a, The lance outer tube 17b rises and collides with a clog 4 such as sand generated in the rotary nozzle 3 as shown in FIG.

At this time, since the tip of the foreign matter removing lance 19 is formed sharp, the clogging material 4 such as sand is crushed,
Oxygen is blown out from the tip to be sequentially removed, and the foreign matter removing lance 19 reaches the solidified material 5 as shown in FIG.

In parallel with this, the cleaning lance 18 also rises and reaches the coagulated material 5, and the igniting agent 13 at the tip moves the coagulated material 5 having a high temperature.
And is ignited. Since the cleaning lance 18 has the igniting agent 13 at its tip and the orifice 20 under the igniting agent, after the igniting agent 13 is melted, the orifice 14 subsequently melts and disappears, and the oxygen flow is automatically adjusted to the ignition oxygen. Transition from flow to scrub oxygen flow.

Thus, the solidified matter 5 in the rotary nozzle 3 is reliably removed. At this time, the foreign matter removing lance 1 propelled in parallel with the cleaning lance 18 is used.
9 also exerts a cleaning effect until oxygen itself is blown out to be dissolved.

Further, the paper sleeve 1 is provided on the outer surface of the cleaning lance 18.
The cleaning effect can be further enhanced if the cleaning time can be maintained for a long time by mounting the device 5 and shielding it from oxygen and heat.

Further, the length (about 300 mm) of the cleaning lance 18 that is melted before cleaning is confirmed in advance by experiments, and the total length is determined in consideration of these, so that the cleaning is not interrupted halfway. I made it.

As shown in the above embodiment, when the clogging in the rotary nozzle 3 is removed, the molten steel 2 starts flowing out.
2 is closed to complete the oxygen cleaning operation. At this time, since the air seal pipe 16 is already attached to the collector nozzle 3d, the operation can be started as it is.
Therefore, there is no need to stop the discharge of the molten steel and complete the installation of the air seal pipe 7 after the completion of the opening as in the related art.

The material such as the lance outer tube contained in the air seal pipe 16 is easily melted by molten steel flowing out.
P, SS, etc. are used.

As described above, according to the embodiment shown in FIGS. 3 and 5, since both the foreign matter removal lance and the cleaning lance are used, a synergistic effect of foreign matter removal and ignition cleaning can be exhibited. Further, according to the embodiment shown in FIG. 3, since the foreign matter removing lance and the cleaning lance are provided integrally, the size can be reduced, and the workability of attaching and detaching can be improved.

As shown in the embodiments of FIGS. 1, 3 and 5, the cleaning lance 18
, The oxygen flow rate is suppressed to an appropriate amount until the ignition agent is melted.

On the other hand, the cleaning lance 18 is provided at the lower end of the oxygen pressure receiving plate 1 having an oxygen vent hole 14a through which an amount required for cleaning flows.
The provision of 4 makes it possible to easily raise the cleaning lance 18 in the lance outer tube 17 by receiving the oxygen pressure from the oxygen pressure receiving plate 14. Further, the oxygen pressure receiving plate 14 is provided with a packing that seals between the lance outer tube 17 and thereby eliminates oxygen leakage from a gap between the lance outer tube 17 and the slide portion, and reliably obtains the thrust for raising the cleaning lance 18. So that the coagulated material can be positively reached.

Further, since there is no oxygen leak from the gap between the lance outer tube 17 and the oxygen pressure receiving plate 14, not only can all oxygen be sent to the clogged portion, but also coagulated matter dissolves during oxygen washing, and Even if it adheres to the tip of the pipe 17,
No reaction with oxygen occurs.

For this reason, the lance outer tube 17 does not melt due to heat in the middle, and the life of the lance is completed.

[0064]

As described above, according to the present invention, the oxygen flow rate automatically shifts from the ignition oxygen flow rate to the cleaning oxygen flow rate, reliably ignites and performs oxygen cleaning, and furthermore, the clogging in the rotary nozzle is reduced. Even low heat materials such as sand can be removed. Further, since a cleaning lance and the like are included in the air seal pipe, it is possible to continue casting even after the opening, so that the steel is not deteriorated by air.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a lance of the present invention.

FIG. 2 is a partial cross-sectional view showing a state in which the lance of the present invention is attached to a ladle molten steel discharging nozzle.

FIG. 3 is a longitudinal sectional view showing another embodiment of the lance of the present invention.

FIG. 4 is a longitudinal sectional view showing a state where the lance of FIG. 3 is mounted on a ladle molten steel discharging nozzle.

FIG. 5 is a longitudinal sectional view showing another embodiment of the lance of the present invention.

FIG. 6 is a longitudinal sectional view showing a state in which the lance of FIG. 5 is attached to a ladle molten steel discharging nozzle.

FIG. 7 is a longitudinal sectional view showing a state of nozzle clogging of a ladle bottom opening / closing section.

FIG. 8 is a partial longitudinal sectional view showing an example of a conventional nozzle clog removal lance.

FIG. 9 is a longitudinal sectional view showing another example of a conventional nozzle clog removal lance.

[Explanation of symbols]

1. Ladle, 2. 2. molten steel; Rotary nozzle, 3a. Upper nozzle 3b. Fixing plate 3c. Sliding plate 3d. 3. Collector nozzle Clogging 5. Coagulated product 6. Tundish 7. 7. Air seal pipe 8. Oxygen pipe for cleaning Cleaning lance 10. 10. Cleaning side end straight pipe Cleaning lance (slide type) 12. Oxygen supply valve 13. Ignition agent 14. Oxygen pressure receiving plate 14e. Packing 15. Paper sleeve 16. 16. Air seal pipe (including lance outer pipe etc.) Outer lance tube 18. Washing lance (slide type with pressure plate installed at rear end) 19. Foreign matter removal lance 20. Orifice

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tsuneo Kondo 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-6-328232 (JP, A) JP-A-6 JP-A-328231 (JP, A) JP-A-61-86053 (JP, A) JP-A-61-37361 (JP, A) JP-A-52-111832 (JP, A) JP-A-7-37461 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 41/44 B22D 11/10 340

Claims (5)

(57) [Claims] 1. An air seal pipe that can be installed below a ladle molten steel discharge nozzle, a straight lance outer pipe included in the air seal pipe and provided at a cleaning side end of a cleaning oxygen pipe, Clogged nozzle hole for ladle molten steel discharge composed of a cleaning lance that is inserted into the inside of the outer tube of the lance so as to be able to move up and down, is equipped with an ignition agent at the tip, and has an oxygen pressure receiving plate with an oxygen vent at the rear end. Removal lance. 2. An air seal pipe which can be installed below the ladle molten steel discharge nozzle, a straight lance outer pipe which is included in the air seal pipe and is provided at the cleaning side end of the cleaning oxygen pipe. A foreign matter removal lance which is inserted into the inside of the lance outer tube so as to be able to move up and down, has a protruding end at the tip, and has an oxygen pressure receiving plate having an oxygen vent at the rear end, and is inserted up and down inside the foreign matter removal lance. Is loaded with an ignition agent at the tip,
And a cleaning lance provided with an oxygen pressure receiving plate having an oxygen vent at the rear end thereof. 3. An air seal pipe which can be installed below a ladle molten steel discharge nozzle and a straight pipe which is contained in the air seal pipe and is provided at a cleaning side end of a cleaning oxygen pipe. And a second lance outer tube, and an oxygen pressure receiving plate which is inserted into the first lance outer tube so as to be able to move up and down, mounts an ignition agent at the tip, and has an oxygen vent at the rear end. A cleaning lance provided, and a foreign matter removal lance which is inserted into the second lance outer tube so as to be movable up and down, has a protruding end at the tip, and has an oxygen vent at the rear end, and is provided with an oxygen pressure receiving plate. A nozzle lance for removing molten steel from the ladle composed of a nozzle lance. 4. A lance for removing molten steel from a ladle according to claim 1, wherein an oxygen amount adjusting plate having an oxygen vent is provided at a tip of the cleaning lance. . 5. The nozzle hole clogging for ladle molten steel discharge according to claim 1, wherein packing is provided between the oxygen pressure receiving plate and the outer tube of the lance. Removal lance.