CN113441708A - Ladle long nozzle argon sealing device and control method thereof - Google Patents
Ladle long nozzle argon sealing device and control method thereof Download PDFInfo
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- CN113441708A CN113441708A CN202110580783.5A CN202110580783A CN113441708A CN 113441708 A CN113441708 A CN 113441708A CN 202110580783 A CN202110580783 A CN 202110580783A CN 113441708 A CN113441708 A CN 113441708A
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- argon
- pipeline
- long nozzle
- tundish
- ladle
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 835
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 401
- 238000007789 sealing Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims description 15
- 238000007664 blowing Methods 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000009749 continuous casting Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 230000007547 defect Effects 0.000 description 10
- 238000005266 casting Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000013589 supplement Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a ladle long nozzle argon sealing device which comprises an argon pipeline group arranged along a long nozzle, wherein the argon pipeline group is positioned between the bottom of a ladle and a tundish, the blowing ports of all argon pipelines in the argon pipeline group face the direction of the long nozzle, the argon pipeline group comprises a second argon pipeline and a first argon pipeline which are arranged from bottom to top, the blowing port of the first argon pipeline is provided with an upper argon ring, the upper argon ring is provided with a plurality of upward air holes, the blowing port of the second argon pipeline is provided with a lower argon ring, the lower argon ring is provided with a plurality of downward air holes, the upper argon ring is arranged at a long nozzle bowl part, and the lower argon ring is arranged below the long nozzle bowl part. The invention blows argon at the large ladle, the long nozzle and the tundish, and solves the problem of secondary oxidation at the long nozzle.
Description
Technical Field
The invention relates to the technical field of ladle long nozzle sealing, in particular to an argon sealing device for a ladle long nozzle and a control method thereof.
Background
At present, argon gas is used for sealing a ladle long nozzle of a continuous casting machine of most iron and steel enterprises, and the principle is that argon gas blown by the long nozzle inhibits air sucked between the surfaces of upper and lower nozzle sliding plates of the ladle to prevent molten steel from being oxidized. The existing argon sealing technology generally sets one path of argon at the bottom of a long nozzle bowl, but has the problem that the flow of the argon is difficult to control, negative pressure is easily formed at the bottom of the long nozzle bowl, air is sucked to generate secondary oxidation, and because the gas in molten steel moves to different depths and different positions of a crystallizer along with the molten steel, bubbles are captured by solidified dendritic crystals at a solid-liquid interface of the molten steel, and finally internal defects such as bubbles, inclusion impurities and the like and surface defects of a casting blank are caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a ladle long nozzle argon sealing device and a control method thereof, which are used for blowing argon at a ladle, a long nozzle and a tundish and solving the problem of secondary oxidation at the long nozzle.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a big packet of long mouth of a river argon gas sealing device, includes the argon gas piping set who sets up along long mouth of a river, argon gas piping set is located between big packet bottom and the middle packet, the mouth of blowing of all argon gas pipelines in the argon gas piping set all is towards the direction at the long mouth of a river, argon gas piping set is including second argon gas pipeline and the first argon gas pipeline that sets up from bottom to top, the mouth of blowing of first argon gas pipeline is provided with the argon gas ring, it is equipped with a plurality of up gas pockets to go up the argon gas ring, the mouth of blowing of second argon gas pipeline is provided with down the argon gas ring, the argon gas ring is equipped with a plurality of gas pockets down, it sets up long mouth of a river department to go up the argon gas ring, the argon gas ring sets up in long mouth of a river bowl below down.
In one embodiment, the argon pipeline set further comprises a third argon pipeline and a fourth argon pipeline, and the distance between the blowing ports of the fourth argon pipeline and the third argon pipeline and the long water gap is greater than the distance between the blowing ports of the second argon pipeline and the first argon pipeline and the long water gap. Because the second argon pipeline is through argon gas ring down along the vertical argon gas that blows off of long mouth of a river, if the gas blow mouth of fourth argon pipeline and third argon pipeline is too close apart from long mouth of a river, the argon gas direction that fourth argon pipeline and third argon pipeline blown off is perpendicular with the direction that argon gas ring blown off argon gas down, influences the argon gas of middle package top sealed, inhales oxygen easily in middle package top and leads to the secondary oxidation.
According to the invention, the first argon pipeline blows out argon towards the upper part of the long nozzle bowl part through the upper argon ring, so that positive pressure is kept between the bottom of the bale and the long nozzle bowl part, and oxygen is prevented from being sucked; the second argon pipeline blows out argon from the position below the long nozzle bowl part to the position between the tundish through a lower argon ring, so that the long nozzle is always in an argon protection environment; and the fourth argon pipeline and the third argon pipeline are positioned below the second argon pipeline and used as supplement for argon blown out by the lower argon ring, so that the long water gap above the tundish is positioned in an argon protection environment.
In one embodiment, one side of the bowl part of the long nozzle is also provided with a long nozzle upper argon sealing pipeline, and the long nozzle upper argon sealing pipeline is positioned above the first argon pipeline.
In one embodiment, the bottom of the bale is provided with an argon hose leading to the interior of the bale. Argon is blown into the molten steel in the ladle, so that the content of dissolved gas (such as hydrogen, nitrogen and oxygen) in the molten steel is reduced, and residual nonmetallic inclusions (such as oxides, sulfides, nitrides and the like) in the molten steel are removed, so that the components and the temperature of the molten steel are uniform before casting, the casting temperature of the casting can be obviously reduced, the normalization of a continuous casting process is realized, and the impact toughness of steel is improved.
In one embodiment, the tundish is provided with a tundish argon pipeline, and a blowing port of the tundish argon pipeline is positioned above the liquid level of the tundish.
In one embodiment, the fourth argon pipeline, the third argon pipeline, the second argon pipeline, the first argon pipeline, the long nozzle upper seal argon pipeline and the tundish argon pipeline are all provided with a gas flow meter and an electromagnetic valve. The gas flow meter measures the argon flow in the argon pipeline, feeds the argon flow back to the control system, and controls the argon supply in the argon pipeline through the electromagnetic valve.
A control method of a ladle long nozzle argon sealing device comprises the following specific steps:
before continuous casting production begins, continuously blowing argon into a ladle by an argon hose, opening electromagnetic valves of a long water gap upper argon sealing pipeline and a tundish argon pipeline, continuously blowing argon between the long water gap upper argon sealing pipeline and the ladle, and continuously blowing argon above the tundish by the tundish argon pipeline to enable the upper end and the lower end of the long water gap to be in an argon protection environment;
then opening an electromagnetic valve of at least one of the fourth argon pipeline, the third argon pipeline, the second argon pipeline and the first argon pipeline, blowing argon to the long water gap, and enabling the long water gap to be in an argon protection environment;
and after the pouring is finished, closing the electromagnetic valves of the fourth argon pipeline, the third argon pipeline, the second argon pipeline, the first argon pipeline, the long water gap upper seal argon pipeline and the tundish argon pipeline.
In one embodiment, at least one of the fourth argon line, the third argon line, and the second argon line blows argon while the first argon line blows argon through the upper argon ring. Because the direction of the argon blown out by the first argon pipeline is upward, and the upper sealing argon pipeline of the long nozzle is positioned above the first argon pipeline, if at least one of the fourth argon pipeline, the third argon pipeline and the second argon pipeline is not opened, the argon of the part of the long nozzle positioned below the upper argon ring is less, negative pressure is easily formed to suck oxygen, the long nozzle is exposed in the oxygen, and secondary oxidation is easily caused.
In one embodiment, when the pouring of the tundish is stopped, the fourth argon pipeline, the third argon pipeline, the second argon pipeline and the first argon pipeline are closed firstly, then the argon sealing pipeline on the long nozzle is closed, and finally the argon pipeline of the tundish is closed.
In one embodiment, the blowing amounts of the argon in the fourth argon pipeline, the third argon pipeline, the second argon pipeline, the first argon pipeline, the long nozzle upper seal argon pipeline and the tundish argon pipeline are automatically adjusted, an argon flow is set before the argon is blown out, an actual argon flow is measured through a gas flowmeter, and the blowing amount of the argon in the pipelines is automatically adjusted through comparing the actual argon flow with the set argon flow.
In conclusion, the invention has the following beneficial effects:
according to the invention, four argon pipelines are additionally arranged at the long nozzle and respectively comprise a first argon pipeline, a second argon pipeline, a third argon pipeline and a fourth argon pipeline from top to bottom, wherein the first argon pipeline is provided with an upper argon ring surrounding the long nozzle, argon is blown out towards the upper part of the long nozzle bowl part, the second argon pipeline is provided with a lower argon ring surrounding the long nozzle, argon is blown out towards the position between the lower part of the long nozzle bowl part and the tundish, and a plurality of argon pipelines blow out argon towards the long nozzle, so that negative pressure suction at the long nozzle part in a continuous casting process is effectively prevented, quality defects and plate bubble defects formed by gas suction and retention in molten steel are reduced, the plate bubble defect waste is reduced to be below 0.2% from the original 2.1%, the rolling pass rate of a thick plate is obviously improved, and better economic benefits are created; but also improves the Als loss qualification rate, prolongs the service life of the tundish body and the quick change mechanism thereof, increases the number of continuous casting furnaces of the tundish, improves the production operation rate and reduces the production cost.
Drawings
FIG. 1 is a schematic of the present invention.
In the figure: 1-large ladle, 2-tundish, 3-long nozzle, 4-crystallizer, 5-argon hose, 6-tundish argon pipeline, 7-long nozzle upper seal argon pipeline, 8-fourth argon pipeline, 9-third argon pipeline, 10-second argon pipeline, 11-first argon pipeline, 12-upper argon ring, 13-lower argon ring, 14-gas flowmeter and 15-electromagnetic valve.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
In the existing continuous casting process, molten steel in a large ladle 1 enters a tundish 2 through a long nozzle 3, and then the molten steel flows into a crystallizer 4 from the tundish 2 to finally form a continuous casting billet for outputting, as shown in fig. 1.
The existing argon sealing device generally only comprises a long nozzle upper sealing argon pipeline 7 and a tundish argon pipeline 6, the long nozzle upper sealing argon pipeline 7 enables the space between a long nozzle bowl part 3 and a ladle 1 lower nozzle to be in argon protective atmosphere, and the tundish argon pipeline 6 enables the liquid level of a tundish 2 to be in argon protective atmosphere. However, the argon sealing device in this form obviously cannot make the whole long nozzle 3 in the argon atmosphere, so that a pressure difference is easily formed between the middle of the long nozzle 3 and two ends of the long nozzle 3, and since argon at two ends of the long nozzle 3 flows, the air pressure at two ends of the long nozzle 3 is smaller than that of the middle of the long nozzle 3, so that negative pressure at positions of the long nozzle 3, a ladle upper nozzle, a bowl of the long nozzle 3 and the like is used for suction, and oxygen enters molten steel to be solidified and retained to form a quality defect.
Therefore, as shown in fig. 1, the invention provides an argon sealing device for a ladle long nozzle, which comprises an argon pipeline group arranged along the long nozzle 3, the argon pipeline group is positioned between the bottom of the large ladle 1 and the tundish 2, the blowing ports of all the argon pipelines in the argon pipeline group face the direction of the long water gap 3, the argon pipeline group comprises a fourth argon pipeline 8, a third argon pipeline 9, a second argon pipeline 10 and a first argon pipeline 11 which are arranged from bottom to top, an upper argon ring 12 is arranged at the blowing port of the first argon pipeline 11, a plurality of upward air holes are arranged on the upper argon ring 12, a lower argon ring 13 is arranged at the blowing port of the second argon pipeline 10, the lower argon ring 13 is provided with a plurality of downward air holes, go up argon gas ring 12 and set up 3 bowls of long mouth of a river department, argon gas ring 13 sets up 3 bowls of a river departments in the lower part.
According to the invention, the first argon pipeline 11 blows argon towards the upper part of the bowl part of the long nozzle 3 through the upper argon ring 12, so that positive pressure is kept between the bottom of the bale 1 and the bowl part of the long nozzle 3, and oxygen is prevented from being sucked; the second argon pipeline 10 blows out argon from the position below the bowl part of the long nozzle 3 to the position between the tundish 2 through the lower argon ring 13, so that the long nozzle 3 is always in an argon protection environment; the fourth argon pipeline 8 and the third argon pipeline 9 are positioned below the second argon pipeline 10 and used as supplement for the argon blown out by the lower argon ring 13, so that the long water gap 3 above the tundish 2 is in an environment protected by argon.
Wherein, bowl portion one side of long mouth of a river 3 still is equipped with long mouth of a river and seals argon gas pipeline 7, long mouth of a river seals argon gas pipeline 7 and is located the top of first argon gas pipeline 11. The tundish 2 is provided with a tundish argon gas pipeline 6, and a gas blowing port of the tundish argon gas pipeline 6 is positioned above the liquid level of the tundish 2.
The bottom of the big bag 1 is provided with an argon hose 5 leading to the inside of the big bag 1. Argon is blown into the molten steel in the ladle 1, so that the content of dissolved gas (such as hydrogen, nitrogen and oxygen) in the molten steel is reduced, and residual nonmetallic inclusions (such as oxides, sulfides and nitrides) in the molten steel are removed, so that the components and the temperature of the molten steel are uniform before casting, the casting temperature of the casting can be obviously reduced, the normalization of a continuous casting process is realized, and the impact toughness of steel is improved.
Further, the distances between the blowing openings of the fourth argon pipeline 8 and the third argon pipeline 9 and the long water gap 3 are larger than the distances between the blowing openings of the second argon pipeline 10 and the first argon pipeline 11 and the long water gap 3. Because the second argon pipeline 10 blows out argon vertically along the long nozzle 3 through the lower argon ring 13, if the blowing openings of the fourth argon pipeline 8 and the third argon pipeline 9 are too close to the long nozzle 3, the direction of the argon blown out by the fourth argon pipeline 8 and the third argon pipeline 9 is perpendicular to the direction of the argon blown out by the lower argon ring 13, which affects the argon sealing above the tundish 2, and oxygen is easily sucked above the tundish 2 to cause secondary oxidation.
Further, the fourth argon pipeline 8, the third argon pipeline 9, the second argon pipeline 10, the first argon pipeline 11, the long nozzle upper seal argon pipeline 7 and the tundish argon pipeline 6 are all provided with a gas flowmeter 14 and a solenoid valve 15. The gas flow meter 14 measures the flow rate of argon in the argon line, feeds the flow rate of argon back to the control system, and controls the supply of argon in the argon line by the electromagnetic valve 15.
The control system is a conventional control system and comprises a PLC control system and a host, wherein the PLC control system is a Siemens S7-400 programmable logic control system, the host is in communication connection with the PLC control system, and the PLC control system is in communication connection with a gas flowmeter and an electromagnetic valve respectively.
A plurality of argon pipelines are additionally arranged on the outer side of the middle part of the long nozzle 3, and the original tundish argon pipeline 6 and the long nozzle upper sealing argon pipeline 7 are not changed. The purpose of upper argon ring 12 and lower argon ring 13 is to blow out argon along the side of long nozzle 3, so that long nozzle 3 is always isolated from oxygen. The fourth argon pipe 8 and the third argon pipe 9 are used as supplements to the second argon pipe 10, and further ensure that the long nozzle 3 is located in an argon atmosphere, because the distance between the lower argon ring 13 and the tundish 2 is long, the fourth argon pipe 8 and the third argon pipe 9 are arranged between the second argon pipe 10 and the tundish 2, and the distances between the blowing ports of the fourth argon pipe 8 and the third argon pipe 9 and the long nozzle 3 are larger than the distances between the blowing ports of the second argon pipe 10 and the first argon pipe 11 and the long nozzle 3, so that the downward blowing of argon by the lower argon ring 13 is not hindered.
The control method of the ladle long nozzle argon sealing device is described by combining the attached drawing 1, and comprises the following specific steps:
before continuous casting production begins, continuously blowing argon into a ladle 1 by an argon hose 5, opening electromagnetic valves 15 of a long water gap upper argon sealing pipeline 7 and a tundish argon pipeline 6, continuously blowing argon between the long water gap 3 and the ladle 1 by the long water gap upper argon sealing pipeline 7, and continuously blowing argon above the tundish 2 by the tundish argon pipeline 6 so that the upper end and the lower end of the long water gap 3 are in an argon protection environment;
then, opening a solenoid valve 15 of at least one of a fourth argon pipeline 8, a third argon pipeline 9, a second argon pipeline 10 and a first argon pipeline 11, blowing argon to the long water gap 3, and enabling the long water gap 3 to be in an argon protection environment;
and after the pouring is finished, closing the fourth argon pipeline 8, the third argon pipeline 9, the second argon pipeline 10, the first argon pipeline 11, the long water gap upper sealing argon pipeline 7 and the electromagnetic valve 15 of the tundish argon pipeline 6.
Further, at least one of the fourth argon line 8, the third argon line 9 and the second argon line 10 blows argon when the first argon line 11 blows argon through the upper argon ring 12. Because the direction of the argon blown out by the first argon pipeline 11 is upward, and the long nozzle upper seal argon pipeline 7 is positioned above the first argon pipeline 11, if at least one of the fourth argon pipeline 8, the third argon pipeline 9 and the second argon pipeline 10 is not opened, the argon in the part of the long nozzle 3 positioned below the upper argon ring 12 is less, so that negative pressure is easily formed to suck oxygen, and the long nozzle 3 is exposed in the oxygen, thereby easily causing secondary oxidation.
It is understood that the fourth argon line 8, the third argon line 9, the second argon line 10, the first argon line 11 of the present invention may be opened simultaneously, wherein the argon flow rate of the fourth argon line 8 and the third argon line 9 is less than the argon flow rate of the second argon line 10.
When the pouring of the tundish 2 is stopped, the fourth argon pipeline 8, the third argon pipeline 9, the second argon pipeline 10 and the first argon pipeline 11 are closed, then the long water gap upper argon sealing pipeline 7 is closed, and finally the tundish argon pipeline 6 is closed.
The blowing amount of argon in the fourth argon pipeline 8, the third argon pipeline 9, the second argon pipeline 10, the first argon pipeline 11, the long nozzle upper sealing argon pipeline 7 and the tundish argon pipeline 6 is automatically adjusted, the argon flow is set before the argon is blown out, the actual argon flow is measured through the gas flowmeter 14, and the blowing amount of argon in the pipelines is automatically adjusted through comparing the actual argon flow with the set argon flow.
The control modes of the fourth argon pipeline 8, the third argon pipeline 9, the second argon pipeline 10 and the first argon pipeline 11 comprise an automatic mode and a locking mode, wherein the automatic mode is that after the argon flow is set to be adjusted, an electromagnetic valve 15 automatically adjusts according to the actual flow state measured by a gas flowmeter 14; in the lock mode, after the set argon flow rate is adjusted, the solenoid valve 15 is opened to the set target flow rate opening degree regardless of the actual flow rate, and in this case, there may be a deviation between the set flow rate and the actual flow rate.
In a fourth argon pipeline 8, a third argon pipeline 9, a second argon pipeline 10, a first argon pipeline 11, a long nozzle upper seal argon pipeline 7 and a tundish argon pipeline 6, when the argon flow is adjusted, the argon flow is used for increasing the gas flow of the corresponding pipeline, the increase is 1NL/min each time, the maximum is 60NL/min, the gas flow of the corresponding pipeline is reduced, the reduction is 1NL/min each time, and the minimum is 1NL/min, when the set data meet the production requirement and maintain for a long enough time, the common data are automatically stored, and the set flow during the last shutdown is directly operated after the set data are restarted.
The invention effectively prevents negative pressure air suction at the 3 parts of the long nozzle in the continuous casting process, reduces the quality defect and the plate bubble defect formed by the solidification and detention of the air sucked into molten steel, reduces the plate bubble defect waste from the original 2.1 percent to below 0.2 percent, obviously improves the rolling pass percent of the thick plate and creates better economic benefit; but also improves the Als loss qualification rate, prolongs the service life of the body of the tundish 2 and the quick change mechanism thereof, increases the number of continuous casting furnaces of the tundish 2, improves the production operation rate and reduces the production cost.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The argon sealing device for the ladle long nozzle is characterized by comprising an argon pipeline group arranged along the long nozzle (3), the argon pipeline group is positioned between the bottom of the large ladle (1) and the tundish (2), the blowing ports of all the argon pipelines in the argon pipeline group face to the direction of the long water port (3), the argon pipeline group comprises a second argon pipeline (10) and a first argon pipeline (11) which are arranged from bottom to top, an upper argon ring (12) is arranged at a blowing port of the first argon pipeline (11), the upper argon ring (12) is provided with a plurality of upward air holes, a lower argon ring (13) is arranged at the blowing port of the second argon pipeline (10), argon gas ring (13) is equipped with a plurality of gas pockets down, it sets up long mouth of a river (3) bowl department to go up argon gas ring (12), argon gas ring (13) set up in long mouth of a river (3) bowl below down.
2. The ladle long nozzle argon sealing device according to claim 1, wherein the argon pipeline set further comprises a third argon pipeline (9) and a fourth argon pipeline (8), and the distances between the blowing openings of the fourth argon pipeline (8) and the third argon pipeline (9) and the long nozzle (3) are larger than the distances between the blowing openings of the second argon pipeline (10) and the first argon pipeline (11) and the long nozzle (3).
3. The ladle long nozzle argon sealing device according to claim 2, wherein a long nozzle upper sealing argon pipeline (7) is further arranged on one side of the bowl portion of the long nozzle (3), and the long nozzle upper sealing argon pipeline (7) is positioned above the first argon pipeline (11).
4. A ladle long nozzle argon sealing device according to claim 3, characterized in that the bottom of the ladle (1) is provided with an argon hose (5) leading to the interior of the ladle (1).
5. The ladle long nozzle argon sealing device according to claim 4, wherein the tundish (2) is provided with a tundish argon pipeline (6), and a blowing port of the tundish argon pipeline (6) is positioned above the liquid level of the tundish (2).
6. The ladle long nozzle argon sealing device according to claim 5, wherein the fourth argon pipeline (8), the third argon pipeline (9), the second argon pipeline (10), the first argon pipeline (11), the long nozzle upper seal argon pipeline (7) and the tundish argon pipeline (6) are provided with a gas flow meter (14) and a solenoid valve (15).
7. A control method of a ladle long nozzle argon sealing device is suitable for the ladle long nozzle argon sealing device according to claim 6,
before continuous casting production begins, continuously blowing argon into a ladle (1) by an argon hose (5), opening electromagnetic valves (15) of a long-nozzle upper-seal argon pipeline (7) and a tundish argon pipeline (6), continuously blowing argon out from the long-nozzle upper-seal argon pipeline (7) to a position between the long nozzle (3) and the ladle (1), and continuously blowing argon out from the tundish argon pipeline (6) to a position above a tundish (2), so that the upper end and the lower end of the long nozzle (3) are in an argon protection environment;
then opening an electromagnetic valve (15) of at least one of a fourth argon pipeline (8), a third argon pipeline (9), a second argon pipeline (10) and a first argon pipeline (11), blowing argon to the long water gap (3), and enabling the long water gap (3) to be in an argon protection environment;
and after the pouring is finished, closing the fourth argon pipeline (8), the third argon pipeline (9), the second argon pipeline (10), the first argon pipeline (11), the long water gap upper sealing argon pipeline (7) and the electromagnetic valve (15) of the tundish argon pipeline (6).
8. The control method of the ladle long nozzle argon sealing device according to claim 7, characterized in that when the first argon pipeline (11) blows out argon through the upper argon ring (12), at least one of the fourth argon pipeline (8), the third argon pipeline (9) and the second argon pipeline (10) blows out argon.
9. The control method of the ladle long nozzle argon sealing device according to claim 8, characterized in that when the pouring of the tundish (2) is stopped, the fourth argon pipeline (8), the third argon pipeline (9), the second argon pipeline (10) and the first argon pipeline (11) are closed, then the long nozzle upper sealing argon pipeline (7) is closed, and finally the tundish argon pipeline (6) is closed.
10. The control method of the ladle long nozzle argon sealing device according to claim 9, wherein the blowing amounts of argon in the fourth argon line (8), the third argon line (9), the second argon line (10), the first argon line (11), the long nozzle upper seal argon line (7) and the tundish argon line (6) are automatically adjusted, an argon flow rate is set before blowing argon, an actual argon flow rate is measured by a gas flowmeter (14), and the blowing amount of argon in the lines is automatically adjusted by comparing the actual argon flow rate with the set argon flow rate.
Priority Applications (1)
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| CN211539462U (en) * | 2019-09-27 | 2020-09-22 | 新兴铸管股份有限公司 | Simple and easy device of mouth of a river argon seal |
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| JPH0919760A (en) * | 1995-07-06 | 1997-01-21 | Daido Steel Co Ltd | Ar blow-off ring and method for casting molten metal using it |
| JPH11226707A (en) * | 1998-02-12 | 1999-08-24 | Akechi Ceramics Kk | Method for preventing blow-up of slag in long nozzle for continuous casting |
| CN200949753Y (en) * | 2006-06-26 | 2007-09-19 | 上海梅山钢铁股份有限公司 | Control system for argon gas box |
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