A method for reducing false alarms of steel leakage alarm system for cutting blanks

Abstract

The present invention relates to a method for reducing the false alarm of steel leakage alarm system and the cutting of billets, and belongs to the technical field of continuous casting methods in the metallurgical industry. The technical scheme of the present invention is: the position of the billet bonding point in the crystallizer is determined according to the alarm thermocouple point, the pulling speed change curve of the continuous casting machine speed reduction process is dynamically set according to the position of the billet bonding point and its distance relative to the lower mouth of the crystallizer, and the healing condition of the bonding point is judged according to the change of the thermocouple temperature curve and the pulling speed of the continuous casting machine is restored accordingly. The beneficial effects of the present invention are: it can dynamically and flexibly control the pulling speed change of the continuous casting machine after the alarm of the crystallizer expert system, significantly reduce the reconnection of the billet and the cutting of the waste billet caused by the drastic change of the pulling speed after the false alarm of the crystallizer expert system, and improve the production efficiency.

Description

Technical Field

[0001] The invention relates to a method for reducing false alarms of a steel leakage alarm system for cutting a billet, and belongs to the technical field of continuous casting methods in the metallurgical industry. Background Art

[0002] The crystallizer is known as the "heart" of the continuous casting machine. It plays a vital role in the solidification of high-temperature molten steel to form a shell, providing a strong guarantee for the continuous production of the continuous casting machine. Most of the existing crystallizer expert systems use multiple rows of thermocouples installed on the crystallizer copper plate to monitor the temperature of each point of the crystallizer copper plate in real time, and then judge the contact state between the molten steel and the crystallizer copper plate through temperature changes, that is, whether the entire copper plate is adhered to the molten steel, whether the temperature of the copper plate is abnormal, and predict steel leakage, etc.

[0003] The current practice of the crystallizer expert system after the adhesion alarm is generally to directly reduce the pulling speed from the normal working pulling speed to a very low pulling speed and maintain it for a period of time to allow the billet adhesion to heal. However, in the face of complex and changeable on-site production conditions, the crystallizer expert system inevitably has the phenomenon of false alarms. Each false alarm emergency speed reduction causes a huge difference in the degree of solidification shrinkage of the billet before and after the speed reduction, and a reconnection defect occurs at the billet position when the alarm is triggered. The billet at this location needs to be cut off and treated as scrap, resulting in a large cost waste. Summary of the invention

[0004] The purpose of the present invention is to provide a method for reducing the false alarm of steel leakage alarm system and the cutting of billets. The position of the billet bonding point in the crystallizer is determined according to the alarm thermocouple point, and the pulling speed change curve of the continuous casting machine speed reduction process is dynamically set according to the position of the billet bonding point and its distance relative to the lower mouth of the crystallizer. The healing condition of the bonding point is judged according to the change of the thermocouple temperature curve and the pulling speed of the continuous casting machine is restored accordingly. The pulling speed change of the continuous casting machine can be dynamically and flexibly controlled after the alarm of the crystallizer expert system, which significantly reduces the reconnection of the billet and the cutting of the waste billet caused by the drastic change of the pulling speed after the false alarm of the crystallizer expert system, and improves the production efficiency, which effectively solves the above-mentioned problems existing in the background technology.

[0005] The technical solution of the present invention is: a method for reducing false alarms of steel leakage alarm system during cutting of blanks, comprising the following steps:

[0006] S1. When the mold expert system issues a billet bonding alarm signal, the distance between the bonding point and the lower mouth of the mold is obtained according to the thermocouple mark that issues the alarm signal;

[0007] S2, calculate the rate at which the casting speed of the continuous casting machine is reduced;

[0008] S3, reducing the casting speed of the continuous casting machine from the working casting speed to the target casting speed according to the rate at which the casting speed of the continuous casting machine is reduced;

[0009] S4, determining whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm, and increasing the casting speed to the working casting speed at different rates according to the type of the alarm signal;

[0010] S5. If the alarm signal is a false alarm, the continuously cast billets produced are all qualified billets and no scrap billets are cut; if the billet bonding is healed during step S3, scrap billets are cut according to the actual range of billet bonding; if the billet bonding is not healed during step S3, the billet at the reconnection position is cut and discarded.

[0011] In step S1, the distance between the bonding point and the lower opening of the crystallizer is the distance between the alarm thermocouple and the lower opening of the crystallizer, and the distance between each thermocouple and the lower opening of the crystallizer is measured in advance and stored in the computer.

[0012] In step S2, the formula for calculating the rate at which the continuous casting machine casting speed is reduced is:

[0013] a=(V0 2 -V 目标 2 ) / (2S-0.4),

[0014] Where a is the rate at which the casting speed of the continuous casting machine is reduced, in m / min 2 ; V0 is the normal working speed before the alarm, in m / min; V 目标 is the target pulling speed to promote bonding healing after the alarm, in m / min; S is the distance S between the bonding point and the lower mouth of the crystallizer when the alarm occurs, in m;

[0015] V 目标 Set according to the type of steel produced. When the steel is high carbon steel or peritectic steel, V 目标 When the steel grade is medium carbon steel, V 目标 When the steel grade is low carbon steel, V 目标 It is 0.4m / min.

[0016] In the step S3, after the casting speed of the continuous casting machine is reduced from the working casting speed to the target casting speed, the target casting speed is maintained for 10 seconds.

[0017] In step S4, if the alarm signal is a false alarm, the 2 Increase the pulling speed to the working pulling speed at a certain rate. When the alarm signal is a true bonding alarm, determine whether the billet bonding has healed during the process of reducing and maintaining the pulling speed. If the billet bonding has healed, keep the pulling speed unchanged for 1 minute and then increase the pulling speed to 0.1m / min. 2If the bonding of the ingot has not healed, directly reduce the pulling speed to 0.2m / min and keep it for 2min, then increase the pulling speed to 0.1m / min. 2 Increase the pulling speed to the working pulling speed at a rate.

[0018] In step S4, the basis for judging whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm is that after the crystallizer expert system issues the bonding alarm signal, during the process of reducing and maintaining the pulling speed in step S3, a new thermocouple triggers an alarm, and the time interval T between the new thermocouple alarm and the initial bonding alarm satisfies the following relationship: (S X / 8V0+S Y / 0.9V0)<T<(S X / 2V0+S Y / 0.6V0), where T is the time interval between the new thermocouple alarm and the initial bonding alarm, in min; V0 is the normal working pulling speed before the alarm, in m / min; S X is the horizontal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters; S Y It is the longitudinal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters.

[0019] In step S4, the method for judging whether the bonding of the ingot has healed is that the temperature of the initial alarm thermocouple rises continuously and the temperature rise reaches 5°C.

[0020] In step S5, the actual range in which billet bonding occurs is the range between the position of the initial alarm thermocouple at the time of the initial alarm of the crystallizer expert system and the position of the initial alarm thermocouple at the time of billet bonding healing; the billet bonding healing time is the time when the temperature of the initial alarm thermocouple begins to rise continuously.

[0021] In the step S5, if the bonding of the ingots is not healed, the ingots within a range of 1 m before and after the ingot reconnection position when the pulling speed is reduced to 0.2 m / min are cut and discarded.

[0022] The beneficial effects of the present invention are as follows: the position of the billet bonding point in the crystallizer is determined according to the alarm thermocouple point, the pulling speed change curve of the continuous casting machine's speed reduction process is dynamically set according to the position of the billet bonding point and its distance relative to the lower mouth of the crystallizer, the healing condition of the bonding point is judged according to the change of the thermocouple temperature curve and the pulling speed of the continuous casting machine is restored accordingly, and the pulling speed change of the continuous casting machine after the alarm of the crystallizer expert system can be dynamically and flexibly controlled, which significantly reduces the billet reconnection and cutting of waste billets caused by the drastic change in pulling speed after the false alarm of the crystallizer expert system, and improves production efficiency. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention are clearly and completely described below. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] A method for reducing false alarms of steel leakage alarm system during cutting of blanks, comprising the following steps:

[0025] S1. When the mold expert system issues a billet bonding alarm signal, the distance between the bonding point and the lower mouth of the mold is obtained according to the thermocouple mark that issues the alarm signal;

[0026] S2, calculate the rate at which the casting speed of the continuous casting machine is reduced;

[0027] S3, reducing the casting speed of the continuous casting machine from the working casting speed to the target casting speed according to the rate at which the casting speed of the continuous casting machine is reduced;

[0028] S4, determining whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm, and increasing the casting speed to the working casting speed at different rates according to the type of the alarm signal;

[0029] S5. If the alarm signal is a false alarm, the continuously cast billets produced are all qualified billets and no scrap billets are cut; if the billet bonding is healed during step S3, scrap billets are cut according to the actual range of billet bonding; if the billet bonding is not healed during step S3, the billet at the reconnection position is cut and discarded.

[0030] In step S1, the distance between the bonding point and the lower opening of the crystallizer is the distance between the alarm thermocouple and the lower opening of the crystallizer, and the distance between each thermocouple and the lower opening of the crystallizer is measured in advance and stored in the computer.

[0031] In step S2, the formula for calculating the rate at which the continuous casting machine casting speed is reduced is:

[0032] a=(V0 2 -V 目标 2 )(2S-0.4),

[0033] Where a is the rate at which the casting speed of the continuous casting machine is reduced, in m / min 2 ; V0 is the normal working speed before the alarm, in m / min; V 目标 is the target pulling speed to promote bonding healing after the alarm, in m / min; S is the distance S between the bonding point and the lower mouth of the crystallizer when the alarm occurs, in m;

[0034] V目标 Set according to the type of steel produced. When the steel is high carbon steel or peritectic steel, V 目标 When the steel grade is medium carbon steel, V 目标 When the steel grade is low carbon steel, V 目标 It is 0.4m / min.

[0035] In the step S3, after the casting speed of the continuous casting machine is reduced from the working casting speed to the target casting speed, the target casting speed is maintained for 10 seconds.

[0036] In step S4, if the alarm signal is a false alarm, the 2 Increase the pulling speed to the working pulling speed at a certain rate. When the alarm signal is a true bonding alarm, determine whether the billet bonding has healed during the process of reducing and maintaining the pulling speed. If the billet bonding has healed, keep the pulling speed unchanged for 1 minute and then increase the pulling speed to 0.1m / min. 2 If the bonding of the ingot has not healed, directly reduce the pulling speed to 0.2m / min and keep it for 2min, then increase the pulling speed to 0.1m / min. 2 Increase the pulling speed to the working pulling speed at a rate.

[0037] In step S4, the basis for judging whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm is that after the crystallizer expert system issues the bonding alarm signal, during the process of reducing and maintaining the pulling speed in step S3, a new thermocouple triggers an alarm, and the time interval T between the new thermocouple alarm and the initial bonding alarm satisfies the following relationship: (S X / 8V0+S Y / 0.9V0)<T<(S X / 2V0+S Y / 0.6V0), where T is the time interval between the new thermocouple alarm and the initial bonding alarm, in min; V0 is the normal working pulling speed before the alarm, in m / min; S X is the horizontal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters; S Y It is the longitudinal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters.

[0038] In step S4, the method for judging whether the bonding of the ingot has healed is that the temperature of the initial alarm thermocouple rises continuously and the temperature rise reaches 5°C.

[0039] In step S5, the actual range in which billet bonding occurs is the range between the position of the initial alarm thermocouple at the time of the initial alarm of the crystallizer expert system and the position of the initial alarm thermocouple at the time of billet bonding healing; the billet bonding healing time is the time when the temperature of the initial alarm thermocouple begins to rise continuously.

[0040] In the step S5, if the bonding of the ingots is not healed, the ingots within a range of 1 m before and after the ingot reconnection position when the pulling speed is reduced to 0.2 m / min are cut and discarded.

[0041] Embodiment 1:

[0042] In this embodiment, when the crystallizer expert system issues a billet sticking alarm signal, the alarm thermocouple number is J3, and the distance between the J3 thermocouple and the lower mouth of the crystallizer is 0.6 m. Therefore, the distance S between the sticking point and the lower mouth of the crystallizer is 0.6 m.

[0043] Before the alarm, the casting speed of the continuous casting machine is 1.1m / min, the steel produced is medium carbon steel, and the target casting speed is 0.5m / min. Therefore, the casting speed reduction rate a is calculated as: a=(1.1 2 -0.5 2 ) / (2×0.6-0.4), i.e. 1.2m / min 2 .

[0044] According to the change rate of 1.2m / min 2 The casting speed of the continuous casting machine was reduced from the working casting speed of 1.1 m / min to the target casting speed of 0.5 m / min, and then maintained at the target casting speed of 0.5 m / min for 10 s.

[0045] Then determine whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm. After the crystallizer expert system issues the bonding alarm signal, no new thermocouple triggers the alarm during the process of reducing and maintaining the pulling speed, so it is determined that this alarm signal is a false alarm. 2 Increase the pulling speed to the working pulling speed at a rate.

[0046] This alarm signal was a false alarm. During the control process, the change in the pulling speed of the continuous casting machine was slow and continuous, and no reconnection defects occurred. Therefore, the continuously cast billets produced in this process were considered qualified billets, and no waste billets were cut.

[0047] Embodiment 2:

[0048] In this embodiment, when the crystallizer expert system issues a billet sticking alarm signal, the alarm thermocouple number is H2, and the distance between the H2 thermocouple and the lower mouth of the crystallizer is 0.72 m. Therefore, the distance S between the sticking point and the lower mouth of the crystallizer is 0.72 m.

[0049] Before the alarm, the casting speed of the continuous caster was 1.2 m / min, the steel grade produced was low-carbon steel, and the target casting speed was 0.4 m / min. Therefore, the rate of decrease a of the casting speed of the continuous caster was a = (1.2 2 - 0.4 2 ) / (2×0.72 - 0.4), that is, 1.23 m / min 2 .

[0050] According to the change rate of 1.23 m / min 2 reduce the casting speed of the continuous caster from the working casting speed of 1.2 m / min to the target casting speed of 0.4 m / min, and then maintain it at the target casting speed of 0.4 m / min for 10 s.

[0051] Then determine whether the alarm signal of the mold expert system is a true sticking alarm or a false alarm. After the mold expert system issues a sticking alarm signal, during the process of reducing and maintaining the casting speed, a new thermocouple G2 triggers an alarm after 0.1 min. The horizontal distance between the G2 thermocouple and the H2 thermocouple is 0.185 m, and the vertical distance is 0. Continue to judge whether the time interval T between the new thermocouple alarm and the initial sticking alarm satisfies the following relationship: (0.185 / 8×1.2 + 0 / 0.9×1.2) < T < (0.185 / 2×1.2 + 0 / 0.6×1.2). After calculation, 0.02775 < T = 0.1 < 0.111, which satisfies the time relationship. Therefore, this alarm signal is a true sticking alarm.

[0052] Continue to judge whether the slab sticking heals during the process of reducing and maintaining the casting speed. Because the temperature of the initial alarm thermocouple H2 has risen continuously, and the temperature rise amplitude reaches 10 °C, which is greater than the temperature rise judgment standard. Therefore, it is judged that the slab sticking has healed. After continuing to maintain the current casting speed of 0.4 m / min unchanged for 1 min, increase the casting speed to the working casting speed at a rate of 0.1 m / min 2 .

[0053] There are surface defects of the slab caused by slab sticking in this process. Therefore, cut the defective slab according to the actual range of slab sticking. When the H2 thermocouple alarms, the casting length of the continuous casting slab at the position of the H2 thermocouple is 420 m. At the start time when the temperature of the H2 thermocouple rises continuously after the alarm, the casting length of the continuous casting slab at the position of the H2 thermocouple is 420.5 m. Therefore, cut the continuous casting slab in the range of 420 m - 420.5 m as the defective slab.

[0054] Example 3:

[0055] In this example, when the mold expert system issues a slab sticking alarm signal, the alarm thermocouple number is E1, and the distance between the E1 thermocouple and the lower opening of the mold is 0.84 m. Therefore, the distance S between the sticking point and the lower opening of the mold is 0.84 m;

[0056] Before the alarm, the casting speed of the continuous casting machine was 1 m / min, the steel grade produced was peritectic steel, and the target casting speed was 0.6 m / min. Therefore, the rate of decrease a of the casting speed of the continuous casting machine was a=(1 2 -0.6 2 ) / (2×0.84 - 0.4), that is, 0.52 m / min 2 .

[0057] According to the change rate of 0.52 m / min 2 the casting speed of the continuous casting machine was reduced from the working casting speed of 1 m / min to the target casting speed of 0.6 m / min, and then maintained at the target casting speed of 0.6 m / min for 10 s.

[0058] Then it was determined whether the alarm signal of the mold expert system was a true sticking alarm or a false alarm. After the mold expert system sent out the sticking alarm signal, during the process of casting speed reduction and maintenance, a new thermocouple F2 triggered an alarm after 0.2 min. The horizontal distance between the F2 thermocouple and the E1 thermocouple was 0.185 m, and the vertical distance was 0.12 m. Continue to judge whether the time interval T between the new thermocouple alarm and the initial sticking alarm satisfied the following relationship: (0.185 / 8×1 + 0.12 / 0.9×1) < T < (0.185 / 2×1 + 0.12 / 0.6×1). After calculation, 0.1565 < T = 0.2 < 0.2925, which satisfied the time relationship. Therefore, this alarm signal was a true sticking alarm.

[0059] Continue to judge whether the slab sticking healed during the process of casting speed reduction and maintenance. Because the temperature of the initial alarm thermocouple E1 did not show a continuous rising phenomenon. Therefore, it was judged that the slab sticking did not heal. After directly reducing the casting speed to 0.2 m / min and maintaining it for 2 min, the casting speed was increased to the working casting speed at a rate of 0.1 m / min 2 .

[0060] There were billet re - welding caused by emergency speed reduction and surface defects of the slab caused by slab sticking during this process. Therefore, the slabs within 1 m before and after the billet re - welding position were cut and discarded as waste. When the emergency speed reduction reached 0.2 m / min, the pouring length of the slab was 481 m. Therefore, the continuous casting billets within the pouring length range of 480 m - 482 m were cut as waste billets.

Claims

1. A method for reducing false alarms of steel leakage alarm system during cutting of blanks, characterized in that The following steps are involved: S1. When the mold expert system issues a billet bonding alarm signal, the distance between the bonding point and the lower mouth of the mold is obtained according to the thermocouple mark that issues the alarm signal; S2, calculate the rate at which the casting speed of the continuous casting machine is reduced; S3, reducing the casting speed of the continuous casting machine from the working casting speed to the target casting speed according to the rate at which the casting speed of the continuous casting machine is reduced; S4. Determine whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm. According to the type of alarm signal, increase the pulling speed to the working pulling speed at different rates. When the alarm signal is a false alarm, increase the pulling speed at 0.3m / min. 2 Increase the pulling speed to the working pulling speed at a rate of 0.1 m / min. When the alarm signal is a true bonding alarm, determine whether the billet bonding has healed during the process of reducing and maintaining the pulling speed. If the billet bonding has healed, keep the pulling speed unchanged for 1 minute and then increase the pulling speed at 0.1 m / min. 2 Increase the pulling speed to the working pulling speed at a rate of 100%. If the billet bonding is still not healed, directly reduce the pulling speed to 0.2m / min and keep it for 2min, then increase it to 0.1m / min. 2 Increase the pulling speed to the working pulling speed at a rate of The basis for judging whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm is that after the crystallizer expert system issues the bonding alarm signal, during the process of reducing and maintaining the pulling speed in step S3, a new thermocouple triggers an alarm, and the time interval T between the new thermocouple alarm and the initial bonding alarm satisfies the following relationship: is a true bonding alarm, where T is the time interval between the new thermocouple alarm and the initial bonding alarm, in min; V0 is the normal working pulling speed before the alarm, in m / min; S X is the horizontal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters; S Y is the longitudinal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters; S5. If the alarm signal is a false alarm, the continuous casting billets produced are all qualified billets, and the waste billets are not cut; if the billet adhesion is healed during the S3 step, the waste billet is cut according to the actual range of the billet adhesion; If the bonding of the ingots is not healed during step S3, the ingots at the rejoining position will be cut and discarded.

2. A method for reducing false alarms of steel leakage alarm system during cutting of blanks according to claim 1, characterized in that: In step S1, the distance between the bonding point and the lower opening of the crystallizer is the distance between the alarm thermocouple and the lower opening of the crystallizer, and the distance between each thermocouple and the lower opening of the crystallizer is measured in advance and stored in the computer.

3. The method for reducing false alarms of steel leakage alarm system in cutting blanks according to claim 1, characterized in that: In step S2, the formula for calculating the rate at which the continuous casting machine casting speed is reduced is: ， Where a is the rate at which the casting speed of the continuous casting machine is reduced, in m / min 2 ; V0 is the normal working speed before the alarm, in m / min; V 目标 is the target pulling speed to promote bonding healing after the alarm, in m / min; S is the distance S between the bonding point and the lower mouth of the crystallizer when the alarm occurs, in m; V 目标 Set according to the type of steel produced. When the steel is high carbon steel or peritectic steel, V 目标 When the steel grade is medium carbon steel, V 目标 When the steel grade is low carbon steel, V 目标 It is 0.4m / min.

4. The method for reducing false alarms of steel leakage alarm system in cutting blanks according to claim 1, characterized in that: In the step S3, after the casting speed of the continuous casting machine is reduced from the working casting speed to the target casting speed, the target casting speed is maintained for 10 seconds.

5. The method for reducing false alarms of steel leakage alarm system in cutting blanks according to claim 1, characterized in that: In the step S5, if the bonding of the ingots is not healed, the ingots within a range of 1 m before and after the ingot reconnection position when the pulling speed is reduced to 0.2 m / min are cut and discarded.

6. A method for reducing false alarms of steel leakage alarm system during cutting of blanks, characterized in that The following steps are involved: S1. When the mold expert system issues a billet bonding alarm signal, the distance between the bonding point and the lower mouth of the mold is obtained according to the thermocouple mark that issues the alarm signal; S2, calculate the rate at which the casting speed of the continuous casting machine is reduced; S3, reducing the casting speed of the continuous casting machine from the working casting speed to the target casting speed according to the rate at which the casting speed of the continuous casting machine is reduced; S4. Determine whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm. According to the type of the alarm signal, increase the pulling speed to the working pulling speed at different rates. The basis for determining whether the alarm signal of the crystallizer expert system is a true bonding alarm or a false alarm is that after the crystallizer expert system issues the bonding alarm signal, during the process of reducing and maintaining the pulling speed in step S3, a new thermocouple triggers an alarm, and the time interval T between the new thermocouple alarm and the initial bonding alarm satisfies the following relationship: is a true bonding alarm, where T is the time interval between the new thermocouple alarm and the initial bonding alarm, in min; V0 is the normal working pulling speed before the alarm, in m / min; S X is the horizontal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters; S Y is the longitudinal distance between the new alarm thermocouple and the initial alarm thermocouple, in meters; S5. If the alarm signal is a false alarm, the continuous casting billets produced are all qualified billets, and the waste billets are not cut; if the billet adhesion is healed during the S3 step, the waste billet is cut according to the actual range of the billet adhesion; If the bonding of the ingots is not healed during step S3, the ingots at the rejoining position will be cut and discarded.

7. A method for reducing false alarms of steel leakage alarm system during cutting of billets according to claim 6, characterized in that: In step S4, the method for judging whether the bonding of the ingot has healed is that the temperature of the initial alarm thermocouple rises continuously and the temperature rise reaches 5°C.

8. A method for reducing false alarms of steel leakage alarm system during cutting of billets according to claim 7, characterized in that: In step S5, the actual range in which billet bonding occurs is the range between the position of the initial alarm thermocouple at the time of the initial alarm of the crystallizer expert system and the position of the initial alarm thermocouple at the time of billet bonding healing; the billet bonding healing time is the time when the temperature of the initial alarm thermocouple begins to rise continuously.

9. A method for reducing false alarms of steel leakage alarm system during cutting of billets according to claim 6, characterized in that: In the step S5, if the bonding of the ingots is not healed, the ingots within a range of 1 m before and after the ingot reconnection position when the pulling speed is reduced to 0.2 m / min are cut and discarded.

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