A strip steel deviation rectifying method based on loop tension gauge

Abstract

The application discloses a strip steel deviation rectifying method based on loop tension gauge, and relates to the technical field of metallurgical automation control. The method comprises the following steps: after the next rack bites the steel and after a delay, the tension deviation value on both sides of the current rack outlet is calculated in real time; if the deviation exceeds the value, it is determined that potential tension loss exists on the side with smaller tension, the roll gap deviation correction amount of the current and next racks is calculated, and the roll gap on the side is lifted; the roll gap correction amount is used to compensate the current rack speed correction amount; the adjustment logic is transmitted step by step with the biting event and is continuously dynamically adjusted; after the strip steel is thrown, all the correction amounts are cancelled. Through real-time dynamic calculation, the method can predict the plate shape change trend in advance, pre-correct the plate shape before the abnormal image appears, avoid the system fluctuation and additional load caused by subsequent large adjustment, reduce the misjudgment and lag of manual intervention, and is beneficial to maintaining the stable working condition, and has a positive effect on improving the rolling process stability, product size precision and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of metallurgical automation control technology, and in particular to a strip steel correction method based on a loop tension gauge. Background Technology

[0002] In the field of metal rolling, traditional methods for correcting strip deviation on finishing mills typically rely on manual intervention by operators based on the rolling condition. This intervention is only detected and addressed when a significant deterioration in strip shape occurs. This "post-event adjustment" model has significant shortcomings: the timing of adjustments is delayed, and substantial adjustments are often required to restore the strip shape, significantly increasing the system load. Furthermore, the effectiveness of intervention is highly dependent on the operator's experience; for inexperienced operators, it is difficult to guarantee the accuracy and timeliness of adjustments, and accidents such as scrapping may occur due to untimely or insufficient adjustments. This makes the stability control of the rolling process unreliable, weakening the overall rolling stability. Especially under complex conditions such as aging equipment, decreased control precision, frequent product specification changes, or rolling new steel grades, rolling instability is further exacerbated, placing enormous operational pressure on operators. Therefore, traditional manual correction methods are ill-suited to the demands of modern production, which involves fluctuating equipment precision, diverse product varieties, and a fast pace. They are only barely applicable to production environments with simple product structures, relatively stable operating conditions, and reliance on highly skilled operators.

[0003] Modern hot strip rolling production lines are generally characterized by a wide variety of products, complex operating conditions, and a fast-paced, continuous production cycle. Under these complex and variable conditions, relying on manual precision adjustment of each strip is inherently uncontrollable, which can easily lead to instability in the rolling process, fluctuations in product dimensional accuracy, and ultimately affect production efficiency and product quality.

[0004] While existing technologies include a patented solution titled "A Measuring Device for Tension Difference in Hot-Rolled Strip Loop Rolls," the core of this solution lies in installing pressure measuring devices at both ends of the loop rolls to measure the tension difference between the two sides online. It claims to convert this difference into a thickness difference signal and feed it back to the thickness control system to improve rolling stability. However, this solution does not provide a specific technical approach for converting the tension difference into a thickness difference signal, nor does it address the subsequent roll gap correction logic. Its focus is solely on the installation and use of the pressure measuring device, lacking a complete description of the actual correction control method.

[0005] To address this issue, this invention proposes a strip deviation correction method based on a looper tension meter, used for online calculation and real-time correction of roll gap deviation on both sides of the strip during the finishing mill rolling process. This method proactively follows changes in production conditions, effectively avoiding large and frequent adjustments during rolling by pre-adjusting for potential shape anomalies. This significantly reduces the burden on the control system, stabilizing the rolling state at a controllable level, thereby comprehensively improving the stability and production efficiency of the rolling process. This method excels in controlling deviation and adapting to changing conditions, making it particularly suitable for modern rolling production lines with high standards for product diversity, production rhythm, and quality precision. Summary of the Invention

[0006] The purpose of this invention is to provide a strip correction method based on a loop tension gauge to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a strip steel correction method based on a loop tension gauge, comprising the following steps: S1. When the next frame bites the steel, after a certain delay, calculate the tension deviation value of the tension gauges on both sides of the current frame outlet in real time. S2. If the tension deviation on both sides exceeds the set threshold, it is determined that there is potential tension loss on the side with smaller tension. Based on this, the roll gap deviation correction amount for the current frame and the next frame is calculated, and the roll gap on that side is raised accordingly. S3. Based on the aforementioned roll gap deviation correction amount for the current frame, compensate for the corresponding speed correction amount in different grades. S4. This adjustment logic is passed sequentially along the stand as the steel biting event occurs, and is continuously dynamically calculated and adjusted during the finishing rolling process of the current rolling block; S5. After the strip steel is finished being discarded from the finishing mill stand, cancel all the corrections made to the stands.

[0008] Preferably, the formula for calculating the deviation value on both sides in step S1 is: in, This represents the tension deviation value on both sides. For transmission side tension, The tension is on the operating side, and the unit is kN. i For the looper number, rolling mill i For the current stand, rolling mill i +1 indicates the next rack.

[0009] Preferably, the delay period in step S1 is specifically as follows: Set delay time parameters The empirical range of this parameter is 100 to 500 ms, which is used to avoid the tension impact disturbance at the moment of steel biting and to ensure that the sampling data is in the steady rolling stage.

[0010] Preferably, the logic for determining the potential for tension loss on the side with less tension in step S2 is as follows: definition When the value is positive, raise the operating side roller gap. When the value is negative, the gap between the rollers on the drive side is raised.

[0011] Preferably, the formula for calculating the roll gap deviation correction amount in step S2 is as follows: Among them, when hour, The formula for calculating the roll gap deviation correction of the current frame is: The formula for calculating the roll gap deviation correction for the next stand is: in, This is the correction amount for the roll gap deviation of the current frame. This is the correction amount for the roll gap deviation of the next stand, in mm. This represents the tension deviation value on both sides. The threshold values ​​for correcting tension deviation on both sides are in kN. This is the correction factor for the roll gap deviation of the current frame. This is the correction factor for the roll gap deviation of the next stand.

[0012] Preferably, the empirical parameters for the roll gap deviation correction amount and the corresponding coefficient are within the following range; The empirical value for the given roll gap deviation correction limit is 0.05 to 0.5. The empirical value for the given roll gap deviation correction limit is 0.05 to 0.3, all in mm; The given empirical value range is 0.07 to 0.15. The given empirical value range is 0.08 to 0.13; The given empirical value range is 2–10 kN; When the calculated roll gap deviation correction exceeds the roll gap deviation correction limit, the current limit value is used for correction.

[0013] Preferably, the control strategy for compensating for the speed correction amount corresponding to the gear segmentation in step S3 is as follows: definition When the correction value is given within the range of 0.05 to 0.5, the corresponding compensation is applied to the current rack speed. ,and The compensation range is given as -0.2 to -0.01 m / s; By using synchronous compensation speed, the amount of nesting between racks can be reduced, which is beneficial for control stability.

[0014] Preferably, the specific implementation of the adjustment logic in step S4, which is transmitted sequentially along the stand as the strip bites, is as follows: In the finishing mill, each stand is equipped with an independent tension deviation monitoring unit and a seam execution unit; when the strip head bites into the subsequent stand in sequence, the preceding stand activates the corresponding correction adjustment logic, forming a cascaded control architecture that is transmitted sequentially from the upstream stand to the downstream stand along the rolling direction.

[0015] Preferably, the specific triggering condition for canceling all the corrections of the racks in step S5 is as follows: The output signals of the finishing mill stand are monitored in real time. When the last finishing mill stand corresponding to the current strip block generates a steel throwing signal or a steel biting falling edge signal, the roll gap deviation correction amount and speed correction amount temporarily stored in all stands are immediately set to 0, so as to realize the correction amount of a single strip rolling cycle is cleared to zero.

[0016] Preferably, the roll gap deviation correction coefficient involved in steps S2 to S4 , Tension deviation correction threshold The speed compensation range is preset with parameters that can be adjusted online via human-computer interaction, allowing for differentiated configurations for different steel grades, rolling specifications, or equipment aging levels.

[0017] The technical effects and advantages of this invention are as follows: 1. This strip correction method based on a looper tension gauge utilizes real-time detection data of tension deviation on both sides of the gauge. It can identify potential tension loss trends and make pre-corrections before any obvious abnormalities appear in the strip shape, or even before the operator can visually detect them. Through real-time, automatic, and continuous closed-loop control, it fundamentally eliminates problems inherent in manual intervention, such as untimely adjustments, insufficient adjustments, or incorrect adjustments. It proactively curbs further amplification of deviations from the initial stage of tension loss, preventing their transmission to downstream stands and the latter half of the strip. This avoids system disturbances caused by large and frequent adjustments, reducing the burden on the control system and effectively decreasing scrap caused by untimely adjustments or operational errors, thereby comprehensively enhancing the stability of the rolling process and overall production efficiency. 2. The strip correction method based on the looper tension gauge, in its key formulas, such as the calculation formula for the roll gap deviation correction, fully considers the direction and magnitude of the tension deviation on both sides of the corresponding frame. By establishing a quantitative mapping relationship between the tension deviation and the roll gap deviation correction, the real-time data provided by the high-reliability detection instrument is accurately converted into the roll gap deviation correction. This algorithm is the core of this method, and its calculation accuracy directly determines the effectiveness of the deviation correction, providing a reliable theoretical and implementation basis for achieving accurate correction.

[0018] 3. The strip correction method based on the looper tension meter has key graded compensation strategies, such as the correlation between roll gap deviation correction and speed correction. It fully considers the impact of roll gap deviation adjustment on system stability. By synchronously compensating for the speed correction of the current stand, the adjustment effect is effectively controlled within the current stand range, minimizing the disturbance to the downstream stand and the second half of the strip, and ensuring a smooth transition in the rolling process.

[0019] 4. The strip correction method based on the loop tension gauge allows key parameters, such as the range of correction coefficients, to be given empirically and adjusted online. This enables targeted optimization for different steel grades, rolling processes, and equipment characteristics, thereby enhancing the universality and scalability of the method to adapt to various rolling conditions and ensure its adaptability under different production conditions. Attached Figure Description

[0020] Figure 1 The following is a flowchart illustrating the execution of a strip correction method based on a loop tension gauge, as provided in an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides, for example Figure 1 The strip correction method based on a loop tension gauge, as shown, includes the following steps: S1. When the next frame bites the steel, after a certain delay, calculate the tension deviation value of the tension gauges on both sides of the current frame outlet in real time. The calculation formula is as follows: in, This represents the tension deviation value on both sides. For transmission side tension, The tension is on the operating side, and the unit is kN. iFor the looper number, rolling mill i For the current stand, rolling mill i +1 indicates the next rack.

[0023] The specific steps for delaying the time period include: setting the delay time parameter. The empirical range of this parameter is 100 to 500 ms, which is used to avoid the tension impact disturbance at the moment of steel biting and to ensure that the sampling data is in the steady rolling stage.

[0024] S2. If the tension deviation on both sides exceeds the set threshold, it is determined that there is potential tension loss on the side with smaller tension. Based on this, the roll gap deviation correction amount for the current frame and the next frame is calculated, and the roll gap on that side is raised accordingly. The logic for determining that the side with less tension has potential for de-tension is as follows: definition When the value is positive, raise the operating side roller gap. When the value is negative, the gap between the rollers on the drive side is raised.

[0025] The formula for calculating the roll gap deviation correction is: Among them, when hour, The formula for calculating the roll gap deviation correction of the current frame is: The formula for calculating the roll gap deviation correction for the next stand is: in, This is the correction amount for the roll gap deviation of the current frame. This is the correction amount for the roll gap deviation of the next stand, in mm. This represents the tension deviation value on both sides. The threshold values ​​for correcting tension deviation on both sides are in kN. This is the correction factor for the roll gap deviation of the current frame. This is the correction factor for the roll gap deviation of the next stand.

[0026] The empirical parameters for the roll gap deviation correction amount and corresponding coefficient are within the range of ; The empirical value for the given roll gap deviation correction limit is 0.05 to 0.5. The empirical value for the given roll gap deviation correction limit is 0.05 to 0.3, all in mm; The given empirical value range is 0.07 to 0.15. The given empirical value range is 0.08 to 0.13; The given empirical value range is 2–10 kN; When the calculated roll gap deviation correction exceeds the roll gap deviation correction limit, the current limit value is used for correction.

[0027] S3. Based on the aforementioned roll gap deviation correction amount for the current frame, compensate for the corresponding speed correction amount in different grades. The control strategy for compensating for the speed correction amount corresponding to the gear division is as follows: definition When the correction value is given within the range of 0.05 to 0.5, the corresponding compensation is applied to the current rack speed. ,and The compensation range is given as -0.2 to -0.01 m / s; By using synchronous compensation speed, the amount of nesting between racks can be reduced, which is beneficial for control stability.

[0028] S4. This adjustment logic is passed sequentially along the stand as the steel biting event occurs, and is continuously dynamically calculated and adjusted during the finishing rolling process of the current rolling block; The specific implementation of the adjustment logic being passed sequentially along the stand as the strip bites is as follows: In the finishing mill, each stand is equipped with an independent tension deviation monitoring unit and a seam execution unit; when the strip head bites into the subsequent stand in sequence, the preceding stand activates the corresponding correction adjustment logic, forming a cascaded control architecture that is passed sequentially from the upstream stand to the downstream stand along the rolling direction.

[0029] S5. After the strip steel is discarded from the finishing mill stand, cancel all the corrections of all stands. The specific triggering condition for canceling all the corrections of all stands is as follows: The output signals of the finishing mill stand are monitored in real time. When the last finishing mill stand corresponding to the current strip block generates a steel throwing signal or a steel biting falling edge signal, the roll gap deviation correction amount and speed correction amount temporarily stored in all stands are immediately set to 0, so as to realize the correction amount of a single strip rolling cycle is cleared to zero.

[0030] More specifically, the roll gap deviation correction coefficients involved in steps S2 to S4 , Tension deviation correction threshold The speed compensation range is preset with parameters that can be adjusted online via human-computer interaction, allowing for differentiated configurations for different steel grades, rolling specifications, or equipment aging levels.

[0031] Working principle: This strip correction method based on a looper tension meter uses real-time detection data of tension deviation on both sides of the looper tension meter to identify potential tension loss trends and make advance corrections before the strip shape shows obvious abnormalities or is even imperceptible to the operator's naked eye. Through real-time, automatic, and continuous closed-loop control, it fundamentally eliminates the problems inherent in manual intervention, such as untimely adjustment, insufficient adjustment amount, or incorrect adjustment direction. It also actively curbs the further amplification of deviation from the initial stage of tension loss and blocks its transmission to the downstream stand and the latter half of the strip. This avoids system disturbances caused by large and frequent adjustments, reduces the burden on the control system, and effectively reduces scrap steel caused by untimely adjustment or operational errors, thereby comprehensively enhancing the stability of the rolling process and overall production efficiency. Furthermore, in key formulas, such as the calculation formula for roll gap deviation correction, the direction and magnitude of tension deviation on both sides of the corresponding frame are fully considered. By establishing a quantitative mapping relationship between tension deviation and roll gap deviation correction, the real-time data provided by the high-reliability detection instrument is accurately converted into roll gap deviation correction. This algorithm is the core of this method, and its calculation accuracy directly determines the effectiveness of deviation correction, providing a reliable theoretical and implementation basis for achieving accurate deviation correction.

[0032] Meanwhile, in the key graded compensation strategy, such as the comparison between the roll gap deviation correction amount and the speed correction amount, the impact of roll gap deviation adjustment on system stability is fully considered. By synchronously compensating the speed correction amount of the current stand, the adjustment impact is effectively controlled within the current stand range, minimizing the disturbance to the downstream stand and the second half of the strip, and ensuring a smooth transition of the rolling process.

[0033] Furthermore, in the processing of key parameters, such as the range of values ​​for correction coefficients, the values ​​can be given based on experience and can be adjusted online. This allows for targeted optimization for different steel grades, rolling processes, and equipment characteristics, thereby enhancing the universality and scalability of the method to adapt to various rolling conditions and ensure its adaptability under different production conditions.

[0034] Example 1: The implementation process of the present invention will be described below with reference to the example. The specific steps are as follows: S1. When the next frame bites the steel, after a certain delay, calculate the tension deviation value of the tension gauges on both sides of the current frame outlet in real time. In this embodiment, the No. 2 looper is calculated in real time. The current frame is F2, the next frame is F3, the delay time is set to 400ms, and the formula for the tension deviation on both sides is: The obtained data is shown in the table below: S2. If the tension deviation on both sides exceeds the set threshold, it is determined that there is a potential loss of tension on the side with smaller tension. Based on this, the roll gap deviation correction amount for the current frame and the next frame is calculated, and the roll gap on that side is raised accordingly. In this embodiment, based on the formula for tension deviation on both sides, =4KN is a positive value, the tension on the operating side is relatively small, and the gap between the rollers on the operating side is raised; If the tension deviation correction threshold on both sides is set to 3KN, then the calculation formula for the roll gap deviation correction of F2 and F3 stands is as follows: The roll gap deviation correction range is 0.05–0.3 mm. The deviation ranges from 0.05 to 0.2 mm, with a roll gap correction factor of 0.1 for F2 and 0.07 for F3. The detailed data obtained from the calculations are shown in the table below: S3. Based on the aforementioned roll gap deviation correction amount for the current frame, compensate for the corresponding speed correction amount in different increments. ; When the correction range is 0.08–0.3 mm, the speed of the F2 frame is compensated. The compensation range is -0.08 to -0.02 m / s; This embodiment =0.1mm, within the required correction range, the speed of the F2 frame needs to be compensated to be -0.03m / s; S4. This adjustment logic is passed sequentially along the stand as the steel biting event occurs, and is continuously dynamically calculated and adjusted during the finishing rolling process of the current rolling block; In this embodiment, the finishing mill has a total of 8 stands; S5. After the finishing mill stand of the strip generates a bite falling edge signal, set all correction values ​​of all stands to 0.

[0035] As can be seen from the above embodiments, the strip correction method based on a looper tension meter proposed in this invention can accurately convert the real-time tension deviation data on both sides provided by a highly reliable detection instrument into a roll gap deviation correction amount. This correction method fundamentally eliminates the problems inherent in manual intervention, such as untimely adjustment, insufficient adjustment amount, or incorrect adjustment direction. It also actively curbs the further amplification of deviation from the initial stage of tension loss, blocking its transmission to the downstream stand and the latter half of the strip. This avoids system disturbances caused by large and frequent adjustments, reduces the burden on the control system, and effectively reduces scrap steel caused by untimely adjustments or operational errors, thereby comprehensively enhancing the stability of the rolling process and overall production efficiency.

[0036] Compared to traditional "post-hoc" methods that rely on operators to detect and intervene only after observing significant deterioration in strip shape and make subjective adjustments based on personal experience, this method proactively adapts to changes in production conditions, achieving forward-looking and adaptive adjustments. It demonstrates significant controllability advantages in stabilizing the rolling process. Considering the characteristics of modern hot strip rolling production lines—multiple product varieties, complex operating conditions, tight production rhythms, and continuous operation—this method exhibits excellent adaptability to operating conditions. It is particularly suitable for modern rolling production lines with high standards for product diversity, production rhythm, and quality precision, possessing outstanding engineering application value and industry promotion significance.

[0037] Example 2: Based on Example 1, this example adjusts the key control parameters in steps S2 to S4 online through a human-machine interface for different rolling conditions to verify the adaptability and universality of this method under different steel grades and specifications.

[0038] Operating Condition 1: Rolling ordinary low carbon steel (Q235B), with specifications of 3.0mm x 1250mm. This steel grade exhibits good plasticity and low deformation resistance, resulting in relatively stable rolling processes. To avoid system oscillations caused by over-adjustment, conservative control parameters are adopted: Delay time parameters Take 200ms; Tension deviation correction threshold on both sides Take 5KN; Current frame roll gap deviation correction factor Take 0.08; Next stand roll gap deviation correction factor Take 0.09; Roll gap deviation correction limit: The upper limit is set at 0.3mm. The upper limit is set at 0.15mm; Speed ​​compensation amount correspond When the range is 0.05~0.3mm, the compensation is -0.05~-0.02m / s.

[0039] Actual operating data shows that during the continuous rolling of 50 Q235B strips, the tension deviation on both sides was always controlled within +3KN, with no obvious deviation or strip shape defects. The correction intervention frequency was about 2 to 3 times per strip, with a smooth adjustment range and stable system operation.

[0040] Working Condition 2: Rolling high-strength low-alloy steel (Q355C), with specifications of 1.5mm x 1500mm. This steel grade has high deformation resistance, high rolling load, and is thinner and wider, making it more sensitive to tension deviations on both sides and prone to deviation. Therefore, more sensitive control parameters are required. Delay time parameters 300ms was selected (to avoid steel-jamming impacts while ensuring response speed). Tension deviation correction threshold on both sides Take 3KN (to lower the trigger threshold and enable earlier intervention). Current frame roll gap deviation correction factor Take 0.12; Next stand roll gap deviation correction factor Take 0.11; Roll gap deviation correction limit value The upper limit is set at 0.5mm. The upper limit is set to 0.25mm; speed compensation amount. correspond When the range is 0.05~0.5mm, the compensation is -0.15~-0.05m / s.

[0041] Actual operating data shows that when rolling Q355C thin and wide strip steel, the tension deviation on both sides often exceeded ±8KN before this method was adopted, resulting in frequent deviation and even scrap. After adopting the above adaptive parameters, the tension deviation was effectively controlled within ±5KN, and the correction intervention frequency was about 5 to 6 times per piece of steel. Although it was more frequent than the first working condition, the adjustment range was small each time and the system response was stable, successfully achieving stable production of this difficult-to-roll product. The scrap rate was reduced by about 70% compared with the traditional manual intervention mode.

[0042] Operating Condition 3: Rolling deep-drawing steel (DC04), with specifications of 2.0mm x 1350mm, and the equipment is in the later stages of service (severe roll wear). Under this operating condition, the equipment accuracy decreases, and roll wear leads to an increase in the original roll gap deviation. Simply relying on small-amplitude dynamic corrections may not be sufficient to suppress the accumulation of deviations. Therefore, a more aggressive parameter configuration is adopted, and the race correction limit is appropriately relaxed. Delay time parameters Take 400ms; Tension deviation correction threshold on both sides Take 4KN; Current frame roll gap deviation correction factor Take 0.14; Next stand roll gap deviation correction factor Take 0.13; Limit value for roll gap deviation correction The upper limit is set at 0.5mm. Upper limit is set to 0.3mm; speed compensation amount correspond When the range is 0.05~0.5mm, the compensation is -0.18~-0.08m / s.

[0043] Actual operating data shows that under aging conditions, when using conservative parameters (such as those in operating condition 1), the peak tension deviation on both sides can still reach ±7 kN, and the plate shape fluctuates significantly. After switching to the aforementioned positive parameters, the tension deviation is controlled within +4.5 kN. Although the single correction amount is slightly larger, because the parameters match the current equipment state, the system can quickly converge to a steady state without triggering new oscillations due to the increased adjustment range. This verifies the adaptability of this method to changes in equipment state.

[0044] Condition 1 is stable with minimal intervention; Condition 2 is more sensitive with frequent intervention, but the amplitude is smaller; while Condition 3 is characterized by equipment aging compensation, effectively suppressing deviations.

[0045] As can be seen from the measured data under the three different working conditions mentioned above, the core control parameter of the strip correction method based on the loop tension gauge proposed in this invention includes the delay time. Tension deviation correction threshold Roll gap deviation correction coefficient , The roll gap correction limit and speed compensation range can all be adjusted and optimized online according to the steel characteristics, specifications, and equipment status. This configurable parameter design endows the method with significant adaptability to operating conditions. For ordinary steel grades with good rolling stability, the use of conservative parameters can avoid unnecessary actions caused by frequent small adjustments. For difficult-to-roll grades or equipment aging conditions, the use of positive parameters can achieve rapid and effective deviation suppression. It can adapt to the production needs of modern hot continuous rolling production lines with multiple varieties, changing operating conditions and fast pace, and has broad engineering application value.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for correcting strip alignment based on a looper tension gauge, characterized in that, Includes the following steps: S1. When the next frame bites the steel, after a certain delay, calculate the tension deviation value of the tension gauges on both sides of the current frame outlet in real time. S2. If the tension deviation on both sides exceeds the set threshold, it is determined that there is potential tension loss on the side with smaller tension. Based on this, the roll gap deviation correction amount for the current frame and the next frame is calculated, and the roll gap on that side is raised accordingly. S3. Based on the aforementioned roll gap deviation correction amount for the current frame, compensate for the corresponding speed correction amount in different grades. S4. This adjustment logic is passed sequentially along the stand as the steel biting event occurs, and is continuously dynamically calculated and adjusted during the finishing rolling process of the current rolling block; S5. After the strip steel is finished being discarded from the finishing mill stand, cancel all the corrections made to the stands.

2. The strip correction method based on a loop tension gauge according to claim 1, characterized in that: The formula for calculating the deviation value on both sides in step S1 is: in, This represents the tension deviation value on both sides. For transmission side tension, The tension is on the operating side, and the unit is kN. i For the looper number, rolling mill i For the current stand, rolling mill i +1 indicates the next rack.

3. The strip correction method based on a loop tension gauge according to claim 2, characterized in that: The specific time delay in step S1 is as follows: Set delay time parameters The empirical range of this parameter is 100 to 500 ms, which is used to avoid the tension impact disturbance at the moment of steel biting and to ensure that the sampling data is in the steady rolling stage.

4. The strip correction method based on a looper tension gauge according to claim 1, characterized in that: The logic for determining the potential for tension loss on the side with less tension in step S2 is as follows: definition When the value is positive, raise the operating side roller gap. When the value is negative, the gap between the rollers on the drive side is raised.

5. The strip correction method based on a looper tension gauge according to claim 1, characterized in that: The formula for calculating the roll gap deviation correction amount in step S2 is: Among them, when hour, The formula for calculating the roll gap deviation correction of the current frame is: The formula for calculating the roll gap deviation correction for the next stand is: in, This is the correction amount for the roll gap deviation of the current frame. This is the correction amount for the roll gap deviation of the next stand, in mm. This represents the tension deviation value on both sides. The threshold values ​​for correcting tension deviation on both sides are in kN. This is the correction factor for the roll gap deviation of the current frame. This is the correction factor for the roll gap deviation of the next stand.

6. The strip correction method based on a looper tension gauge according to claim 5, characterized in that: The empirical parameters for the roll gap deviation correction amount and corresponding coefficient are within the following range: The empirical value for the given roll gap deviation correction limit is 0.05 to 0.

5. The empirical value for the given roll gap deviation correction limit is 0.05 to 0.3, all in mm; The given empirical value range is 0.07 to 0.

15. The given empirical value range is 0.08 to 0.13; The given empirical value range is 2–10 kN; When the calculated roll gap deviation correction exceeds the roll gap deviation correction limit, the current limit value is used for correction.

7. The strip correction method based on a looper tension gauge according to claim 1, characterized in that: The control strategy for compensating for the speed correction amount corresponding to the gear segmentation in step S3 is as follows: definition When the correction value is given within the range of 0.05 to 0.5, the corresponding compensation is applied to the current rack speed. ,and The compensation range is given as -0.2 to -0.01 m / s; By using synchronous compensation speed, the amount of nesting between racks can be reduced, which is beneficial for control stability.

8. The strip correction method based on a looper tension gauge according to claim 1, characterized in that: The specific implementation of the adjustment logic in step S4, which is transmitted sequentially along the stand as the strip bites, is as follows: In the finishing mill, each stand is equipped with an independent tension deviation monitoring unit and a seam execution unit; when the strip head bites into the subsequent stand in sequence, the preceding stand activates the corresponding correction adjustment logic, forming a cascaded control architecture that is transmitted sequentially from the upstream stand to the downstream stand along the rolling direction.

9. The strip correction method based on a looper tension gauge according to claim 1, characterized in that: The specific triggering conditions for canceling all the corrections of the racks in step S5 are as follows: The output signals of the finishing mill stand are monitored in real time. When the last finishing mill stand corresponding to the current strip block generates a steel throwing signal or a steel biting falling edge signal, the roll gap deviation correction amount and speed correction amount temporarily stored in all stands are immediately set to 0, so as to realize the correction amount of a single strip rolling cycle is cleared to zero.

10. A strip correction method based on a looper tension gauge according to claim 1, characterized in that: The roll gap deviation correction coefficient involved in steps S2 to S4 , Tension deviation correction threshold The speed compensation range is preset with parameters that can be adjusted online via human-computer interaction, allowing for differentiated configurations for different steel grades, rolling specifications, or equipment aging levels.

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