Automatic detection method for slab continuous casting quick-change submersed nozzle

Abstract

The invention discloses an automatic detection method for a slab continuous casting quick-change submersed nozzle. The automatic detection method comprises the following steps that an automatic detection program for replacing a slab of the submersed nozzle is built in a continuous casting machine control system; whether the current casting information is stable or not is judged, and if yes, a quick-change water gap abnormal code is marked on a currently-cast plate blank; after a submersed nozzle is switched and crystallizer casting powder is replaced, an automatic detection program continuously collects equipment operation information, if a currently-cast slab is still in an unstable state of submersed nozzle replacement operation, the currently-cast slab is marked with a quick-change nozzle abnormal code once, and after the pulling speed of a continuous casting machine is changed or the mode of the continuous casting machine is switched, the quick-change nozzle abnormal code is marked on the currently-cast slab. And automatically detecting program resetting and ending. The method has the beneficial effects that the abnormal plate blank outflow rate of replacing the submersed nozzle is effectively reduced, the probability of misjudgment and unjudgment of the plate blank in the continuous casting production process is reduced, and the automation and intelligence level of continuous casting production is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting production processes, and particularly relates to an automatic detection method for quickly replacing submerged nozzles in slab continuous casting. Background Art

[0002] Continuous casting is an important process in the converter steelmaking workshop and plays a decisive role in product quality. Currently, the theoretical production capacity of a single continuous casting machine can reach 2.88 million tons. Quality control of continuous casting slabs with higher efficiency and stronger accuracy has become the primary technical goal. When replacing the submerged nozzle during the continuous casting production process, there are significant fluctuations in the liquid level of the mold and the molten layer of the mold powder, causing the mold powder to be entrained, and it is necessary to manage and block the slabs with replaced submerged nozzles.

[0003] At present, the inventor's treatment of the quick replacement technology of the submerged nozzle during the continuous casting production process is as follows: starting with manual input, after the operation of replacing the submerged nozzle is completed, manual input is relied on again to end. Due to a large amount of manual intervention, the relative labor intensity is high, and there will be a problem of insufficient accuracy in the interval judgment of the slab with a quickly replaced nozzle. In a certain operation of replacing the submerged nozzle, due to the staff forgetting to input the code for quickly replacing the nozzle, a quality accident of alarm error in the subsequent process occurred. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic detection method for quickly replacing submerged nozzles in slab continuous casting, which can effectively reduce the abnormal slab outflow rate during the replacement of the submerged nozzle, reduce the probability of misjudgment and non-judgment of slabs during the continuous casting process, and improve the automation and intelligent level of continuous casting production.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: An automatic detection method for quickly replacing submerged nozzles in slab continuous casting, comprising the following steps: Step A: An automatic detection program for replacing slabs with submerged nozzles is built into the continuous casting machine control system; Step B: During the casting operation, the automatic detection program automatically collects equipment startup information, judges whether the equipment startup information meets the preset startup conditions. If it meets, it is considered that the current casting information is stable, and the automatic detection program triggers the automatic detection mode to mark the slab being cast with an abnormal code for quickly replacing the nozzle. Otherwise, it is considered that the current casting information is unstable, and wait for the continuous casting machine control system to adjust until the current casting information is stable; Step C: After replacing the submerged nozzle and the mold powder, the automatic detection program automatically collects equipment operation information; Step D: Based on the equipment operation information collected by the automatic detection program, determine whether the current is in the first information state. If so, it is considered that the slab being cast is still in an unstable state of the submerged nozzle replacement operation. Mark the slab being cast with a fast nozzle change abnormality code once, and jump to Step C. Otherwise, execute Step E. Among them, the first information state is that the casting speed of the continuous caster is less than 0.8 m / min and the continuous caster mode is in the casting mode; Step E: Based on the equipment operation information collected by the automatic detection program, if the current is in the second information state, it is considered that the submerged nozzle replacement operation ends normally, and jump to Step F. If the current is in the third information state, it is considered that the submerged nozzle replacement operation terminates abnormally, and jump to Step F. Among them, the second information state is that the casting speed of the continuous caster is greater than or equal to 0.8 m / min and the continuous caster mode is in the casting mode, and the third information state is that the casting speed of the continuous caster is less than 0.8 m / min or the continuous caster mode is not in the casting mode; Step F: Reset the automatic detection program and end.

[0006] Further, in the above Step C, Step D, and Step E, the equipment operation information includes the continuous caster mode signal and the continuous caster casting speed signal.

[0007] Further, in the above Step B, the equipment startup information includes: tundish tonnage information, continuous caster mode signal, continuous caster casting speed signal, tundish car limit signal, and fast change oil cylinder action signal.

[0008] Further, in the above Step B, the corresponding relationship between the equipment startup information and the preset startup conditions includes: (1) The tundish tonnage is greater than or equal to 20 tons; (2) The continuous caster mode is in the casting mode; (3) The continuous caster casting speed is less than or equal to 0.65 m / min; (4) The tundish car controls the movement of the submerged nozzle of the tundish and places the submerged nozzle into the mold; (5) When the submerged nozzle is placed into the mold, start the fast change oil cylinder.

[0009] Advantages of the present invention: This method effectively reduces the abnormal slab outflow rate of replacing the submerged nozzle, reduces the probability of misjudgment and non-judgment of slabs during the continuous casting process, improves the automation and intelligence level of continuous casting production, helps the production quality control of iron and steel enterprises, reduces costs for the subsequent processes, and improves the overall economic benefits of iron and steel enterprises. Description of the Drawings

[0010] Figure 1It is a flowchart of an automatic detection method for a quick-change submerged entry nozzle in slab continuous casting according to the present invention. Detailed implementation manners

[0011] The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0012] As Figure 1 shown, an automatic detection method for a quick-change submerged entry nozzle in slab continuous casting includes the following steps: Step A: An automatic detection program for replacing the slab of the submerged entry nozzle is built into the continuous casting machine control system; Step B: During the casting operation, the automatic detection program automatically collects equipment start-up information, determines whether the equipment start-up information meets the preset start-up conditions. If it meets, it is considered that the current casting information is stable, and the automatic detection program triggers the automatic detection mode to mark the quick-change nozzle abnormal code for the currently cast slab. Otherwise, it is considered that the current casting information is unstable, and wait for the continuous casting machine control system to adjust until the current casting information is stable; Step C: After switching the submerged entry nozzle and replacing the mold powder, the automatic detection program automatically collects equipment operation information; Step D: Based on the equipment operation information collected by the automatic detection program, determine whether it is in the first information state currently. If so, it is considered that the slab currently being cast is still in the unstable state of replacing the submerged entry nozzle, mark the quick-change nozzle abnormal code for the currently cast slab once, and jump to Step C; otherwise, execute Step E, where the first information state is that the continuous casting machine casting speed is less than 0.8 m / min and the continuous casting machine mode is in the casting mode; Step E: Based on the equipment operation information collected by the automatic detection program, if it is in the second information state currently, it is considered that the operation of replacing the submerged entry nozzle ends normally and jump to Step F; if it is in the third information state currently, it is considered that the operation of replacing the submerged entry nozzle terminates abnormally and jump to Step F, where the second information state is that the continuous casting machine casting speed is greater than or equal to 0.8 m / min and the continuous casting machine mode is in the casting mode, and the third information state is that the continuous casting machine casting speed is less than 0.8 m / min or the continuous casting machine mode is not in the casting mode; Step F: The automatic detection program resets and ends.

[0013] In Steps C, D, and E, the equipment operation information includes the continuous casting machine mode signal and the continuous casting machine casting speed signal.

[0014] In Step B, the equipment start-up information includes: tundish tonnage information, continuous casting machine mode signal, continuous casting machine casting speed signal, intermediate ladle car limit signal, and quick-change oil cylinder action signal.

[0015] In the said step B, the correspondence between the device startup information and the preset startup conditions includes: (1) The tundish tonnage is greater than or equal to 20 tons; (2) The continuous caster mode is in the casting mode; (3) The casting speed of the continuous caster is less than or equal to 0.65 m / min; (4) The tundish car controls the movement of the submerged entry nozzle of the tundish and places the submerged entry nozzle into the mold; (5) When the submerged entry nozzle is placed into the mold, the quick-change oil cylinder is started.

[0016] It should be noted that an automatic detection program for replacing the submerged entry nozzle of the slab is configured on the first-level control system of the continuous caster. When replacing the submerged entry nozzle online, the action signal of the quick-change oil cylinder, the limit signal of the tundish car, the continuous caster mode signal, the continuous caster casting speed signal, and the tundish tonnage information are automatically collected. Then, the automatic detection program generates an abnormal code for the quick-change submerged entry nozzle of the slab based on the above information data. After the casting speed of the continuous caster rebounds or the continuous caster mode switches, the automatic detection program is stopped. According to the generation times of the abnormal code for the quick-change submerged entry nozzle and the operation information of related equipment, the abnormal slabs caused by replacing the submerged entry nozzle are accurately identified, thereby effectively reducing the outflow rate of abnormal slabs caused by replacing the submerged entry nozzle, reducing the probability of misjudgment and non-judgment of slabs during the continuous casting production process, and improving the automation and intelligent level of continuous casting production.

[0017] The above is only the preferred embodiment of the present invention. It should be pointed out that the above preferred embodiment should not be regarded as a limitation to the present invention. The protection scope of the present invention should be subject to the scope defined by the claims. For those skilled in the art of this technology, without departing from the spirit and scope of the present invention, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. An automatic detection method for a quick-change submerged entry nozzle in slab continuous casting, characterized in that: It includes the following steps: Step A: An automatic detection program for replacing the submerged nozzle of the slab is built into the continuous casting machine control system; Step B: During the casting operation, the automatic detection program automatically collects the equipment startup information, judges whether the equipment startup information meets the preset startup conditions. If it meets, it is considered that the current casting information is stable, and the automatic detection program triggers the automatic detection mode to mark the abnormal code of the quick-change nozzle for the currently cast slab. Otherwise, it is considered that the current casting information is unstable, and waits for the continuous casting machine control system to regulate until the current casting information is stable; Step C: After replacing the submerged nozzle and the mold powder, the automatic detection program automatically collects the equipment operation information; Step D: Based on the equipment operation information collected by the automatic detection program, judge whether it is in the first information state currently. If it is, it is considered that the slab being cast is still in the unstable state of the submerged nozzle replacement operation, mark the abnormal code of the first quick-change nozzle for the currently cast slab, and jump to Step C. Otherwise, execute Step E, where the first information state is that the continuous casting machine casting speed is less than 0.8 m / min and the continuous casting machine mode is in the casting mode; Step E: Based on the equipment operation information collected by the automatic detection program, if it is in the second information state currently, it is considered that the submerged nozzle replacement operation ends normally and jumps to Step F. If it is in the third information state currently, it is considered that the submerged nozzle replacement operation terminates abnormally and jumps to Step F, where the second information state is that the continuous casting machine casting speed is greater than or equal to 0.8 m / min and the continuous casting machine mode is in the casting mode, and the third information state is that the continuous casting machine casting speed is less than 0.8 m / min or the continuous casting machine mode is not in the casting mode; Step F: The automatic detection program resets and ends.

2. The automatic detection method of the quick-change submerged nozzle for slab continuous casting according to claim 1, characterized in that: In Step C, Step D, and Step E, the equipment operation information includes the continuous casting machine mode signal and the continuous casting machine casting speed signal.

3. The automatic detection method of the quick-change submerged nozzle for slab continuous casting according to claim 1, characterized in that: In Step B, the equipment startup information includes: tundish tonnage information, continuous casting machine mode signal, continuous casting machine casting speed signal, tundish car limit signal, and quick-change cylinder action signal.

4. The automatic detection method of the quick-change submerged nozzle for slab continuous casting according to claim 3, characterized in that: In Step B, the corresponding relationship between the equipment startup information and the preset startup conditions includes: (1) The tundish tonnage is greater than or equal to 20 tons; (2) The continuous casting machine mode is in the casting mode; (3) The continuous casting machine casting speed is less than or equal to 0.65 m / min; (4) The tundish car controls the movement of the submerged nozzle of the tundish and places the submerged nozzle into the mold; (5) When the submerged nozzle is placed into the mold, start the quick-change cylinder.

Images