Control method for improving shearing precision of flying shear
By using two thermal metal detectors in fly shears to detect the speed of the intermediate blank and dynamically correct its operating speed, the problem of insufficient shear accuracy of fly shears is solved, and higher production efficiency and safety are achieved.
Patent Information
- Application Number
- CN202510682879.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2025-07-08
AI Technical Summary
Flying shears are not accurate enough in hot-rolled strip production, resulting in large velocity deviations, affecting production efficiency and safety. Especially in the on-site environment where high temperatures and frictional forces change, it is easy to cause steel pile accidents.
Two thermal metal detectors (HMDs) are used to detect the distance and time signals of the intermediate blank, and the running speed of the intermediate blank is calculated through integral calculation, dynamically corrected the shear speed of fly shears, and precise control is performed using the correction coefficient.
It improves the shear accuracy and production efficiency of fly shears, reduces interference from on-site factors, ensures the accuracy and safety of the shear process, and reduces costs.
Smart Images
Figure CN120268805A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a control method for improving the shearing precision of a flying shear, and belongs to the technical field of hot-rolled strip production methods in the metallurgical industry. Background Art
[0002] After a slab is rolled into an intermediate billet by a rough rolling mill, some tongue-shaped, fish-tail-shaped and other shapes will appear at the head and tail. The function of the flying shear is to cut off the irregular head and tail shapes of the intermediate billet, facilitating the biting and discharging of the finishing mill. The speed control precision of the flying shear is relatively high in actual production. The main reasons affecting the speed are as follows: 1. Due to factors such as high temperature, steam and cooling water in the on-site environment, sensors such as encoders for measuring the speed of the intermediate billet malfunction or deviate, resulting in a large deviation between the speed of the intermediate billet and the actual speed. 2. Due to the change of the shape of the intermediate billet, the friction force between the pinch rolls or roller tables and the intermediate billet strip continuously changes, and the rotational resistance received continuously changes, which may cause slight slippage of the strip steel, resulting in a large deviation between the speed of the strip steel and the actual speed.
[0003] Both of the above reasons cause the shearing of the flying shear to be inaccurate. Seriously, it affects the shearing speed of the flying shear, thus affecting the shearing precision of the flying shear. Sometimes it will cause a steel piling accident, resulting in the scrapping of billets and production delays. Therefore, the determination of the strip steel speed is a main factor affecting the shearing precision of the flying shear. Summary of the Invention
[0004] The purpose of the present invention is to provide a control method for improving the shearing precision of a flying shear. By comprehensively processing the detection information of two hot metal detectors (HMDs), obtaining a more accurate running speed of the intermediate billet, dynamically correcting the running speed of the intermediate billet on the roller table, ensuring the accuracy of this speed, reducing the interference of on-site factors, making the shearing speed calculated using the running speed of the intermediate billet more accurate during the head and tail shearing processes of the flying shear, improving the precision control of the flying shear, being simple and easy to implement, having low cost, high efficiency, good safety, and effectively solving the above problems existing in the background art.
[0005] The technical solution of the present invention is: a control method for improving the shearing precision of a flying shear, comprising the following steps: (1)When the flying shear cuts the head of the intermediate billet, after the rising edge of the 1# hot metal detector detects the intermediate billet, it indicates that the head of the intermediate billet enters the effective window calculated by the 1# hot metal detector and the 2# hot metal detector. The integration of the moving speed of the intermediate billet starts, and ends after the rising edge of the 2# hot metal detector detects the intermediate billet. The ratio of the calculated length between the 1# hot metal detector and the 2# hot metal detector to the actual length between them is obtained by integrating the time and the set speed, and is used as the correction coefficient for the moving speed of the head of the intermediate billet. When the flying shear cuts the head, the cutting speed is obtained by multiplying the set speed of the intermediate billet by the flying shear speed correction coefficient and the lead ratio. (2)When the flying shear cuts the tail of the intermediate billet, after the falling edge of the 1# hot metal detector loses detection of the intermediate billet, it indicates that the tail of the intermediate billet enters the effective window calculated by the 1# hot metal detector and the 2# hot metal detector. The integration of the moving speed of the intermediate billet starts, and ends after the falling edge of the 2# hot metal detector loses detection of the intermediate billet. The ratio of the calculated length between the 1# hot metal detector and the 1# hot metal detector to the actual length between them is obtained by integrating the time and the set speed, and is used as the correction coefficient for the moving speed of the head of the intermediate billet. The actual cutting speed when the flying shear cuts the tail is obtained by multiplying the set speed of the intermediate billet by the flying shear speed correction coefficient and the lead ratio.
[0006] The range of the intermediate billet speed correction coefficient is 0.8 - 1.2. When exceeding the upper and lower limits, an alarm prompt is given. The intermediate billet speed is corrected according to the calculated upper or lower limit coefficient for shearing, or the operator intervenes for manual shearing.
[0007] Add a hot metal detector of the same model at the same position of the 1# hot metal detector and the 2# hot metal detector, and the two metal detectors are used in parallel during production operation.
[0008] The beneficial effects of the present invention are as follows: By using the detection information of the two hot metal detectors, comprehensively processing the distance and time signals, a more accurate running speed of the intermediate billet is obtained, dynamically correcting the running speed of the intermediate billet on the roller table, ensuring the accuracy of this speed, reducing the interference of on-site factors, making the cutting speed calculated by using the running speed of the intermediate billet more accurate during the process of the flying shear cutting the head and the tail, improving the precision control of the flying shear, being simple and easy to implement, having low cost, high efficiency, and good safety. Description of the Drawings
[0009] Figure 1 It is a schematic layout diagram of the hot metal detector and the related equipment of the flying shear of the present invention; Figure 2 It is a schematic diagram of the flying shear cutting head process of the present invention; Figure 3 It is a schematic diagram of the flying shear cutting tail process of the present invention; In the figure: 1# Hot Metal Detector HMD1, 2# Hot Metal Detector HMD2, coiler lower pinch roll encoder 1, coiler pinch roll 2, moving direction of intermediate billet 3, flying shear encoder 4, flying shear 5, descaling upper pinch roll encoder 6, descaling pinch roll 7, head cutting shear blade 8, tail cutting shear blade 9. Specific Embodiment
[0010] In order to make the objectives, technical solutions and advantages of the invention embodiments clearer, the following will, in conjunction with the accompanying drawings in the embodiments, clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are a small part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0011] A control method for improving the shearing accuracy of a flying shear, comprising the following steps: (1) When the flying shear shears the head of the intermediate billet, when the rising edge of the 1# Hot Metal Detector detects the intermediate billet, it indicates that the head of the intermediate billet enters the effective window calculated by the 1# Hot Metal Detector and the 2# Hot Metal Detector, and starts to integrate the moving speed of the intermediate billet. When the rising edge of the 2# Hot Metal Detector detects the intermediate billet, the integration ends; the ratio of the calculated length between the 1# Hot Metal Detector and the 2# Hot Metal Detector to the actual length between the two is obtained by integrating the time and the set speed, and is used as the moving speed correction coefficient of the head of the intermediate billet. When the flying shear cuts the head, the shearing speed is obtained by multiplying the set speed of the intermediate billet by the flying shear speed correction coefficient and the lead ratio. (2) When the flying shear shears the tail of the intermediate billet, when the falling edge of the 1# Hot Metal Detector loses the intermediate billet, it indicates that the tail of the intermediate billet enters the effective window calculated by the 1# Hot Metal Detector and the 2# Hot Metal Detector, and starts to integrate the moving speed of the intermediate billet. When the falling edge of the 2# Hot Metal Detector loses the intermediate billet, the integration ends; the ratio of the calculated length between the 1# Hot Metal Detector and the 1# Hot Metal Detector to the actual length between the two is obtained by integrating the time and the set speed, and is used as the moving speed correction coefficient of the head of the intermediate billet. When the flying shear cuts the tail, the actual shearing speed is obtained by multiplying the set speed of the intermediate billet by the flying shear speed correction coefficient and the lead ratio.
[0012] The range of the intermediate billet speed correction coefficient is 0.8 - 1.2. When exceeding the upper and lower limits, an alarm prompt is given, and the intermediate billet speed is corrected according to the calculated upper or lower limit coefficient for shearing, or manual shearing is intervened by the operator.
[0013] Add one hot metal detector of the same model at the same position of the 1# Hot Metal Detector and the 2# Hot Metal Detector, and the two metal detectors are used in parallel during production operation.
[0014] In practical applications, through a large amount of data analysis, it is found that the range of the intermediate billet speed correction coefficient is 0.8 - 1.2; when the upper and lower limits are exceeded, an alarm is given to the operator. In the case of automation, the shearing speed coefficient is calculated according to the upper or lower limit for shearing, or the operator manually intervenes in the shearing.
[0015] To improve the operating reliability of the HMD (Hot Metal Detector), one HMD of the same model is added at the same position of HMD1 and HMD2, and the two metal detectors are used in parallel during production operation.
[0016] The main equipment layout before and after the flying shear is as Figure 1 shown, and the present invention operates according to the following steps: ① When the flying shear shears the head of the intermediate billet, as Figure 2 shown, after the 1# Hot Metal Detector HMD1 detects the intermediate billet, it can be known that at least one of the two HMDs (HMD1A and HMD1B) installed at this position has detected the intermediate billet, indicating that the head of the intermediate billet has entered the effective window calculated by the 1# Hot Metal Detector HMD1 and the 2# Hot Metal Detector HMD2, and the integral of the set speed of the intermediate billet movement starts. When HMD2 detects the intermediate billet, it can be known that at least one of the two HMDs (HMD2A and HMD2B) installed at this position has detected the intermediate billet, and the integral calculation is immediately ended. Using the ratio of the calculated length of 13.1 meters between HMD1 and HMD2 obtained by the integral to the actual length of 13.5, 13.1 / 13.5 = 0.97. This value is considered valid within the range of (0.8, 1.2) and is used as the intermediate billet speed correction coefficient. Therefore, during the head cutting process, the speed after correction by the intermediate billet = set speed * speed correction coefficient = 1.1 * 0.97 = 1.067 m / s. Finally, the shearing speed during the flying shear head cutting is obtained by multiplying the speed after correction by the intermediate billet by the lead ratio; ② When the flying shear shears the tail of the intermediate billet, as Figure 3As shown, when HMD1 detects the loss of the intermediate billet, it can be known that at least one of the two HMDS (HMD1A and HMD1B) installed at this position has detected the loss of the intermediate billet, indicating that the tail of the intermediate billet has entered the effective window calculated by HMD1 and HMD2, and the integration of the set speed of the intermediate billet movement starts. When HMD2 detects the loss of the intermediate billet, it can be known that at least one of the two HMDS (HMD2A and HMD2B) installed at this position has detected the loss of the intermediate billet, and the integration ends. Using the ratio of the calculated length of 13.8 between HMD1 and HMD2 obtained by integration to the actual length of 13.5 meters, 13.8 / 13.5 = 1.02. This value is considered valid within the range of (0.8, 1.2). This value is used as the intermediate billet speed correction coefficient. During the process of flying shear tailing, the actual speed of the intermediate billet = set speed * flying shear speed correction coefficient = 0.72 * 1.02 = 0.734 m / s. Finally, the shearing speed during flying shear tailing is obtained by multiplying the corrected speed of the intermediate billet by the leading rate.
[0017] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art in the technical field disclosed by the present disclosure can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present disclosure, and these modifications or substitutions should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.
Claims
1. A control method for improving the shearing accuracy of a flying shear, characterized in that The steps include: (1) When the flying shear shears the head of the intermediate billet, after the rising edge of the 1# hot metal detector detects the intermediate billet, it indicates that the head of the intermediate billet enters the effective window calculated by the 1# hot metal detector and the 2# hot metal detector, and starts to integrate the moving speed of the intermediate billet. The integration ends after the rising edge of the 2# hot metal detector detects the intermediate billet; the ratio of the calculated length between the 1# hot metal detector and the 2# hot metal detector to the actual length between the two is obtained by integrating the time and the set speed, and is used as the correction coefficient for the moving speed of the head of the intermediate billet. When the flying shear cuts the head, the cutting speed is obtained by multiplying the set speed of the intermediate billet by the flying shear speed correction coefficient and the lead ratio; (2) When the flying shear shears the tail of the intermediate billet, after the falling edge of the 1# hot metal detector loses the intermediate billet, it indicates that the tail of the intermediate billet enters the effective window calculated by the 1# hot metal detector and the 2# hot metal detector, and starts to integrate the moving speed of the intermediate billet. The integration ends after the falling edge of the 2# hot metal detector loses the intermediate billet; the ratio of the calculated length between the 1# hot metal detector and the 1# hot metal detector to the actual length between the two is obtained by integrating the time and the set speed, and is used as the correction coefficient for the moving speed of the head of the intermediate billet. The actual cutting speed when the flying shear cuts the tail is obtained by multiplying the set speed of the intermediate billet by the flying shear speed correction coefficient and the lead ratio.
2. The control method for improving the shearing accuracy of a flying shear according to claim 1, wherein: The range of the intermediate billet speed correction coefficient is 0.8 - 1.
2. When it exceeds the upper and lower limits, an alarm prompt is given, and the intermediate billet speed is corrected according to the calculated upper or lower limit coefficient for shearing, or the operator intervenes for manual shearing.
3. A control method for improving the shearing accuracy of a flying shear according to claim 1, characterized in that: Add a hot metal detector of the same model at the same position of the 1# hot metal detector and the 2# hot metal detector, and the two metal detectors are used in parallel during production operation.