CN114074185A - Method for quickly replacing tundish nozzle of wide plate casting machine - Google Patents
Method for quickly replacing tundish nozzle of wide plate casting machine Download PDFInfo
- Publication number
- CN114074185A CN114074185A CN202111199537.1A CN202111199537A CN114074185A CN 114074185 A CN114074185 A CN 114074185A CN 202111199537 A CN202111199537 A CN 202111199537A CN 114074185 A CN114074185 A CN 114074185A
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- China
- Prior art keywords
- liquid level
- nozzle
- crystallizer
- control mode
- water gap
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- 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
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for quickly replacing a tundish nozzle of a wide plate casting machine, which comprises the following steps: (1) setting the automatic withdrawal stopping straightening liquid level in the crystallizer at 24 mm; (2) setting the blank drawing speed to be 0.6 m/min; (3) placing the baked water gap in a servo position; (4) the control mode is changed into a manual control mode, and the stopper rod is manually closed; (5) a specially-assigned person is arranged to observe the crystallizer liquid level colorimeter from the monitoring disc surface, when the liquid level drops to 80mm, the quick-change nozzle button is operated to push the nozzle from the servo position to the working position, the stopper rod is manually opened, the crystallizer liquid level is controlled to the working liquid level, and then the control mode is switched to automatic; (6) and taking the old water gap out of the crystallizer. The invention aims to provide a method for quickly changing a tundish nozzle of a wide plate casting machine, which solves the problem that steel is clamped between plates in the process of quickly changing the nozzle of the wide plate casting machine, thereby avoiding abnormal casting stop and improper casting blank flaw detection caused by oxygen absorption between the plates.
Description
Technical Field
The invention relates to a method for quickly changing a water gap of a tundish of a wide plate casting machine, aiming at improving the success rate of quickly changing the water gap, reducing production accidents and improving the quality of a casting blank.
Background
With the rapid development of the continuous casting process and the continuous improvement of the high-efficiency continuous casting machine, in order to improve the operating rate of the continuous casting machine, higher requirements are put forward on the service life of a continuous casting tundish nozzle, the normal service life of one nozzle is 600-800 min, the service life of a tundish can reach about 1500min, and in order to improve the service efficiency of the tundish and the operating rate of a casting machine, a tundish nozzle quick-change process is introduced.
At present, the quick-change mechanism of the water gap is generally the same as that of the Wiuswey company, the quick-change method of each manufacturer is basically the same, and the method comprises the following specific steps: (1) setting the automatic withdrawal stopping straightening liquid level in the crystallizer at 36 mm; (2) the pulling speed is reduced to 0.6 m/min; (3) feeding the baked submerged nozzle into a crystallizer and positioning the baked submerged nozzle at a servo position; (4) the control mode is changed into manual operation; (5) manually closing the stopper rod, and then immediately pushing the water gap to a working position along the slide way by using the main push oil cylinder; (6) manually opening the stopper rod to control the liquid level of the crystallizer to be the working liquid level; (7) and changing the mode into an automatic control mode. The defects of the steps are that the new water gap is pushed to the working position from the servo position immediately after the stopper rod is closed manually, and because residual molten steel still exists in the upper water gap of the tundish after the stopper rod is closed, the residual molten steel in the upper water gap flows between the upper water gap and the submerged nozzle plate in the process of pushing the new water gap to the working position by using the hydraulic cylinder, so that steel is clamped between the plates, oxygen is absorbed in the casting process, the water gap is corroded, and molten steel is oxidized, so that production accidents and casting blank quality accidents are caused. The steel-clad wide plate casting machine only has 3 times of steel-clamping oxygen absorption of a quick-change nozzle in 2021 year, 2 months and 1 month, so that the nozzle penetrates steel and stops casting abnormally, and 490 tons of steel are improper due to oxygen absorption flaw detection between plates.
Through search, many Chinese patents related to the quick replacement of the water gap are found, but the traditional method is not enough to solve the problem of steel clamping between the water gaps, and most of the Chinese patents are applied to a mechanism device used for the quick replacement of the submerged water gap.
The Chinese patent with the application number of 201811155947.4 discloses an on-line automatic submerged nozzle replacing method based on liquid level automatic control, which is characterized in that the nozzle replacing condition is identified and judged through automatic control, and a related steel flow control mechanism automatically executes the nozzle replacing operation, so that the steel clamping between plates when the nozzles are replaced is eliminated.
The application number 202021126121.8 discloses an anti-sticking steel device for a continuous casting quick-change nozzle slide, which is characterized in that a protective device is added on the slide, so that steel splashed when a nozzle is quickly changed is blocked by the protective device, and the steel penetrating accident of the nozzle is reduced.
No matter above patent is through automatic control change mouth of a river or improve mouth of a river quick change device, has all obviously increased manufacturing cost, and this patent is through improving mouth of a river quick change method, has avoided the inter-plate to press from both sides the steel completely, and the while is the increase cost again, has maneuverability and good application prospect.
Disclosure of Invention
The invention aims to provide a method for quickly changing a tundish nozzle of a wide plate casting machine, which solves the problem that steel is clamped between plates in the process of quickly changing the nozzle of the wide plate casting machine, thereby avoiding abnormal casting stop and improper casting blank flaw detection caused by oxygen absorption between the plates.
The analysis and research show that the reason for clamping steel between plates is that in the process of pushing a new water gap from a servo position to a working position immediately after a stopper rod is closed, the residual molten steel in an upper water gap enters between the upper water gap and the lower water gap by a machine, the solution is that the stopper rod cannot be pushed immediately after being closed, the stopper rod is kept closed for a proper time, the residual molten steel in the upper water gap fully flows into a crystallizer, and then the water gap is pushed, so that the steel clamping between the plates can be avoided.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for quickly replacing a tundish nozzle of a wide plate casting machine, which comprises the following steps:
(1) setting the automatic withdrawal stopping straightening liquid level in the crystallizer at 24 mm;
(2) setting the blank drawing speed to be 0.6 m/min;
(3) placing the baked water gap in a servo position;
(4) the control mode is changed into a manual control mode, and the stopper rod is manually closed;
(5) a specially-assigned person is arranged to observe the crystallizer liquid level colorimeter from the monitoring disc surface, when the liquid level drops to 80mm, the quick-change nozzle button is operated to push the nozzle from the servo position to the working position, the stopper rod is manually opened, the crystallizer liquid level is controlled to the working liquid level, and then the control mode is switched to automatic;
(6) and taking the old water gap out of the crystallizer.
Further, the nozzle must be baked to above 1200 c and then placed in the servo position with a clamp.
Compared with the prior art, the invention has the beneficial technical effects that:
the method has the advantages that the manufacturing cost of products is not increased, the method is properly improved on the basis of the original method for quickly changing the water gap, the stopper rod is manually closed, a special person observes the crystallizer liquid level colorimeter, the closing and staying time of the stopper rod can be relatively accurately controlled, residual molten steel in the upper water gap in the tundish is fully drained, the problem of steel clamping between plates is completely avoided, production accidents and quality accidents caused by quickly changing the water gap are avoided, the operability is high, and the method has a good application prospect.
Detailed Description
The following detailed description of the present invention is provided to assist those skilled in the art in providing a more complete, accurate and thorough understanding of the present invention.
A method for quickly replacing a tundish nozzle of a wide plate casting machine comprises the following steps: (1) setting the automatic withdrawal stopping straightening liquid level in the crystallizer at 24 mm; (2) setting the blank drawing speed to be 0.6 m/min; (3) placing the baked water gap in a servo position; (4) the control mode is changed into a manual control mode, and the stopper rod is manually closed; (5) a specially-assigned person is arranged to observe the crystallizer liquid level colorimeter from the monitoring disc surface, when the liquid level drops to 80mm, the quick-change nozzle button is operated to push the nozzle from the servo position to the working position, and then the control mode is switched to automatic; (6) and taking the old water gap out of the crystallizer by using a clamp.
And (2) setting the automatic withdrawal and straightening stopping liquid level in the crystallizer at 24mm in the step (1). The liquid level is reduced from 36mm to 24mm, so that the pulling stopping time can be delayed, the time is strived for when the stopper rod is closed and the residual molten steel in the upper nozzle fully flows into the crystallizer, the liquid level is uncontrollable to be too low, and if the liquid level is lower than the side holes on the two sides of the submerged nozzle, the casting powder in the crystallizer enters the molten steel to cause production accidents and quality accidents.
And (2) setting the blank drawing speed to be 0.6 m/min. The normal working casting speed is about 1.0m/min, the casting machine is not stopped at the quick-change water gap, the casting speed is reduced to 0.6m/min for the casting safety during the quick-change water gap, and the time is strived for the residual molten steel in the upper water gap to fully flow into the crystallizer after the stopper rod is closed, but the casting speed cannot be set too low, otherwise the casting blank quality is difficult to guarantee, and the casting machine is even stopped.
In the step (1) and the step (2), according to the throwing speed of 0.6m/min, 9.6 seconds are needed for reducing the working liquid level of the crystallizer from 120mm to 24mm, and the working liquid level is increased by 1.2 seconds compared with the previous 8.4 seconds, so that time is taken for the subsequent operation and the residual molten steel to flow into the crystallizer.
And (3) placing the baked water gap in a servo position. The submerged nozzle must be baked to above 1200 ℃, and 3 people cooperate with the clamp to place the nozzle in a servo position.
And (4) changing the control mode into a manual control mode, and manually closing the stopper rod. After the stopper rod is closed, the crystallizer liquid level begins to drop.
And (5) a specially-assigned person is arranged to observe the crystallizer liquid level colorimeter from the monitoring disc surface, when the liquid level drops to 80mm, the quick-change nozzle button is operated to push the nozzle to a working position from a servo position, the stopper rod is manually opened, the liquid level of the crystallizer is controlled to the working liquid level, and then the control mode is switched to be automatic. The colorimeter can accurately reflect the actual liquid level in the crystallizer, and after the stopper rod is closed, the liquid level of the crystallizer is reduced from 120mm to 80mm for 4s, so that residual molten steel at an upper nozzle in the tundish can be ensured to fully flow into the crystallizer, and steel clamping between plates is completely avoided.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (2)
1. A method for quickly replacing a tundish nozzle of a wide plate casting machine is characterized by comprising the following steps:
(1) setting the automatic withdrawal stopping straightening liquid level in the crystallizer at 24 mm;
(2) setting the blank drawing speed to be 0.6 m/min;
(3) placing the baked water gap in a servo position;
(4) the control mode is changed into a manual control mode, and the stopper rod is manually closed;
(5) a specially-assigned person is arranged to observe the crystallizer liquid level colorimeter from the monitoring disc surface, when the liquid level drops to 80mm, the quick-change nozzle button is operated to push the nozzle from the servo position to the working position, the stopper rod is manually opened, the crystallizer liquid level is controlled to the working liquid level, and then the control mode is switched to automatic;
(6) and taking the old water gap out of the crystallizer.
2. The method of claim 1, wherein the nozzle is baked to a temperature above 1200 ℃ and then the nozzle is clamped to the servo position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111199537.1A CN114074185A (en) | 2021-10-14 | 2021-10-14 | Method for quickly replacing tundish nozzle of wide plate casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111199537.1A CN114074185A (en) | 2021-10-14 | 2021-10-14 | Method for quickly replacing tundish nozzle of wide plate casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114074185A true CN114074185A (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111199537.1A Pending CN114074185A (en) | 2021-10-14 | 2021-10-14 | Method for quickly replacing tundish nozzle of wide plate casting machine |
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| CN (1) | CN114074185A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619022A (en) * | 2022-03-11 | 2022-06-14 | 山东莱钢永锋钢铁有限公司 | Method for reducing slag entrapment during replacement of submerged nozzle in square billet continuous casting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5971060A (en) * | 1997-01-17 | 1999-10-26 | Sumitomo Heavy Industries, Ltd. | Slab continuous casting machine having immersing nozzle replacing apparatus and method of replacing immersing nozzle |
| CN104399927A (en) * | 2014-11-14 | 2015-03-11 | 武汉钢铁(集团)公司 | Quick replacement control technology for tundish nozzle |
| CN107282902A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | Method for replacing submerged nozzle |
| CN113042726A (en) * | 2021-03-11 | 2021-06-29 | 天津市新天钢钢铁集团有限公司 | Method for treating steel channeling between slab continuous casting quick-change water gap plates |
| CN113084145A (en) * | 2021-04-02 | 2021-07-09 | 重庆钢铁股份有限公司 | Continuous casting tundish nozzle replacing process |
-
2021
- 2021-10-14 CN CN202111199537.1A patent/CN114074185A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5971060A (en) * | 1997-01-17 | 1999-10-26 | Sumitomo Heavy Industries, Ltd. | Slab continuous casting machine having immersing nozzle replacing apparatus and method of replacing immersing nozzle |
| CN104399927A (en) * | 2014-11-14 | 2015-03-11 | 武汉钢铁(集团)公司 | Quick replacement control technology for tundish nozzle |
| CN107282902A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | Method for replacing submerged nozzle |
| CN113042726A (en) * | 2021-03-11 | 2021-06-29 | 天津市新天钢钢铁集团有限公司 | Method for treating steel channeling between slab continuous casting quick-change water gap plates |
| CN113084145A (en) * | 2021-04-02 | 2021-07-09 | 重庆钢铁股份有限公司 | Continuous casting tundish nozzle replacing process |
Non-Patent Citations (1)
| Title |
|---|
| 王爱东等: ""唐钢板坯连铸机快换水口夹钢的原因分析"", 《连铸》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114619022A (en) * | 2022-03-11 | 2022-06-14 | 山东莱钢永锋钢铁有限公司 | Method for reducing slag entrapment during replacement of submerged nozzle in square billet continuous casting |
| CN114619022B (en) * | 2022-03-11 | 2023-09-12 | 山东莱钢永锋钢铁有限公司 | Method for reducing slag by replacing submerged nozzle in square billet continuous casting |
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Application publication date: 20220222 |