Rolling mill structure, rolling mill precision monitoring system and monitoring method thereof

Abstract

The application belongs to a rolling mill structure in the technical field of steel rolling equipment, and further relates to a rolling mill precision monitoring system and a monitoring method thereof. The rolling mill structure comprises a housing upper body, an upper pressure plate, a stepped plate, an HCG cylinder, a PT, a bearing seat pressure plate, an upper support roller bearing seat, an upper work roller bearing seat, a work roller axial locking U groove, a bearing seat lining plate, a work roller housing lining plate, a work roller CVC block, a lower work roller bearing seat, a lower support roller bearing seat, a support roller axial locking lug plate, a support roller bearing seat lining plate, a support roller housing lining plate, a rocker plate, a lower stepped plate, a slide seat upper lining plate, a slide seat, a slide seat lower lining plate, a gland, an upper equalizing plate, an LC, a lower equalizing plate, a base, and a housing lower body. The rolling mill structure can effectively improve the rolling mill monitoring precision, keep the rolling mill precision within a controllable range, effectively improve the rolling line capacity, realize the rolling stability and rolling efficiency of high-strength and thin-gauge product production, and improve the product rolling quality.

Description

Technical Field

[0001] This invention belongs to the technical field of steel rolling equipment, and more specifically, relates to a rolling mill structure. This invention also relates to a rolling mill precision monitoring system and its monitoring method. Background Technology

[0002] The precision of rolling mill equipment is a crucial factor for stabilizing rolling mill production and achieving the production of ultra-strong and extreme specification products. However, the current definition of the precision of key rolling mill equipment is incomplete, focusing only on the stiffness retention rate and the stiffness difference between the OS and DS sides of the rolling mill, resulting in a narrow scope. Furthermore, there is a lack of monitoring of the precision of key rolling mill equipment. Operators are required to report abnormalities affecting production or equipment failures, and post-event analysis is needed to remedy and restore the precision of key rolling mill equipment. Pre-emptive prediction and prevention are not possible. Finally, when equipment failures or disruptions to production stability occur, it is not possible to quickly identify the influencing factors and end-point factors, requiring significant time for analysis and verification. The monitoring of the precision of key rolling mill equipment is not digitized or intelligent, and no evaluation system has been established. This lack of real-time support for rolling mill production and the failure to achieve seamless interaction between the precision of key rolling mill equipment and production are significant challenges. Therefore, when rolling mill production is abnormal or when accidents such as steel stacking or tail-wagging occur, rolling mill process and operator personnel must spend considerable time searching and collecting large amounts of data to analyze and troubleshoot operational and process factors before finding problems with equipment function or precision. Sometimes, the cause remains unclear. Currently, in major domestic hot rolling mills of strip and plate, equipment maintenance is carried out by the equipment operators based on routine items or spot checks and feedback from the production side. Without the support of critical equipment precision evaluation, production and equipment operate independently, failing to form an effective synergy.

[0003] Chinese Patent (Publication No.: CN202210796684.5) discloses "Method and Device for End Analysis and Maintenance of Longitudinal Stiffness of Rolling Mill Based on Orthogonal Test [Invention]", which: 1) provides a method for end analysis and maintenance of longitudinal stiffness of rolling mill based on orthogonal test, which is implemented by electronic equipment; 2) provides a device for end analysis and maintenance of longitudinal stiffness of rolling mill based on orthogonal test, which is used to implement the method for end analysis and maintenance of longitudinal stiffness of rolling mill based on orthogonal test. Chinese Patent (Publication No.: CN112862284A) discloses "A Method and System for Accuracy Evaluation of Stiffness of Hot-Rolled Strip Steel Rolling Mill", which: 1) provides a method for accuracy evaluation of stiffness of hot-rolled strip steel rolling mill, including real-time acquisition of measured data during the zero-adjustment calibration process of the rolling mill to obtain a comprehensive score for the accuracy of the rolling mill stiffness; 2) compares the obtained comprehensive score for the accuracy of the rolling mill stiffness with a preset score range in real time and makes a judgment, and issues an early warning when the obtained comprehensive score for the accuracy of the rolling mill stiffness exceeds the preset score range. However, the prior art does not address the technical issues and solutions of this application. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a monitoring method for a mill precision monitoring system that is simple in steps, can effectively improve the monitoring accuracy of the mill, keep the mill precision within a controllable range, effectively increase the production capacity of the rolling line, realize the rolling stability and rolling efficiency of high-strength, thin-gauge products, and improve the rolling quality of products, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] This invention relates to a monitoring method for a rolling mill precision monitoring system. The monitoring steps of the method are as follows:

[0007] S1. The mill precision monitoring system stores and sets mill precision monitoring standard values, including mill stiffness retention rate standard value, mill calibration leveling value standard value, calibration OS / DS stiffness deviation standard value, calibration OS / DS position deviation standard value, through plate OS inlet / outlet position deviation standard value, through plate DS inlet / outlet position deviation standard value, backup pressure sensor rolling force deviation standard value when calibration is successful, OS inlet / outlet deviation change standard value when steel bites, and DS inlet / outlet deviation change standard value when steel bites.

[0008] S2. The mill precision monitoring system includes a mill precision monitoring actual value acquisition component. The actual values ​​of mill precision monitoring include the actual value of mill stiffness retention rate, the actual value of mill calibration leveling value, the actual value of stiffness deviation on both sides of calibration OS / DS, the actual value of position deviation on both sides of calibration OS / DS, the actual value of position deviation of OS inlet and outlet of through plate, the actual value of position deviation of DS inlet and outlet of through plate, the actual value of rolling force deviation on both sides of the backup pressure sensor when calibration is successful, the actual value of OS inlet and outlet deviation change when steel bites, and the actual value of DS inlet and outlet deviation change when steel bites.

[0009] S3. The mill accuracy monitoring system compares each standard value with the corresponding actual value. Based on the set evaluation system, it determines the scores for mill stiffness retention rate, mill calibration leveling value, stiffness deviation on both sides of calibration OS / DS, position deviation on both sides of calibration OS / DS, OS inlet and outlet position deviation of through plate, DS inlet and outlet position deviation of through plate, rolling force deviation on both sides of the backup pressure sensor when calibration is successful, OS inlet and outlet deviation change when biting steel, and DS inlet and outlet deviation change when biting steel, and obtains a comprehensive mill accuracy score.

[0010] S4. When calibration is successful, if the actual value of the rolling force deviation on both sides of the backup pressure sensor is greater than or equal to five times the standard value of the rolling force deviation on both sides of the backup pressure sensor, the mill accuracy monitoring system determines the comprehensive score to be 0, and the mill accuracy is unqualified; if the comprehensive score is above 85, the mill accuracy is qualified.

[0011] The scoring criteria for the mill stiffness retention rate are as follows: >90%, 10 points; 90%~85%, 8 points; 85%-80%, 6 points; 80%-70%, 3 points; <70%, 0 points. The scoring criteria for the mill calibration leveling value are as follows: Actual leveling value <1.5, 10 points; 1.5~1.8, 8 points; 1.8~2.0, 6 points; 2.0~2.5, 2.5 points. >2.5 scores 0 points; F1-F2 calibration and leveling value <0.5 scores 10 points; 0.5~0.8 scores 8 points; 0.8~1.0 scores 6 points; 1.0~1.2 scores 2.5 points; >1.2 scores 0 points; F3-F7 calibration and leveling value <0.3 scores 10 points; 0.3~0.5 scores 8 points; 0.5~0.8 scores 6 points; 0.8~1.0 scores 2.5 points; >1.0 scores 0 points. A score >90 is excellent (normal); 85-90 is good (normal); <85 is unqualified (abnormal analysis and adjustment).

[0012] The scoring criteria for calibrating the stiffness deviation on both sides of OS / DS are as follows: 40 points for actual values ​​<200; 32 points for 200~300; 24 points for 300~500; 20 points for 500~800; 10 points for 800~1000; and 0 points for >1000.

[0013] The scoring criteria for the positional deviation of the OS / DS sides are as follows: Actual value <1.0, 5 points; 1.0~1.5, 4 points; 1.5~2.0, 3 points; 2.0~2.5, 2 points; >2.5, 0 points. The scoring criteria for the positional deviation of the OS entrance / exit of the through-plate are as follows: Actual value <1.0, 10 points; 1.0~1.5, 8 points; 1.5~2.0, 6 points; 2.0~2.5, 4 points; >2.0, 0 points. The scoring criteria for the positional deviation of the DS entrance / exit of the through-plate are as follows: Actual value <1.0, 10 points; 1.0~1.5, 8 points; 1.5~2.0, 6 points; 2.0~2.5, 4 points; >2.0, 0 points.

[0014] The scoring criteria for the rolling force deviation on both sides of the backup pressure sensor when calibration is successful are as follows: actual value ≤1000KN, 5 points; 1000~1500KN, 4 points; 1500~2000KN, 3 points; 2000~3000KN, 2 points; >3000KN, 0 points. The scoring criteria for the change in OS inlet / outlet deviation during steel biting are as follows: actual value ≤0.5mm, 5 points; 0.5~1mm, 3 points; 1~1.5, 1 point; >1.5, 0 points. The scoring criteria for the change in DS inlet / outlet deviation during steel biting are as follows: actual value ≤0.5mm, 5 points; 0.5~1mm, 3 points; 1~1.5, 1 point; >1.5, 0 points.

[0015] After each change of the work roll, the mill shall be zero-adjusted and calibrated. If the stiffness deviation on both sides of the OS / DS calibration exceeds 200KN / mm, check the vertical bearing components. If the average fluctuation of the rolling force deviation on both sides of the spare pressure sensor is greater than 5% when the calibration is successful, check the horizontal gap of the roll crossing and the horizontal bearing components.

[0016] This invention also relates to a simple rolling mill precision monitoring system that can effectively improve the monitoring accuracy of rolling mills, maintain the rolling mill precision within a controllable range, effectively increase the rolling line capacity, achieve rolling stability and efficiency in the production of high-strength, thin-gauge products, and improve the rolling quality of products. The rolling mill precision monitoring system stores standard values ​​for rolling mill precision monitoring, including standard values ​​for rolling mill stiffness retention rate, standard values ​​for rolling mill calibration and leveling values, standard values ​​for stiffness deviation on both sides of calibration OS / DS, standard values ​​for position deviation on both sides of calibration OS / DS, standard values ​​for position deviation at the OS inlet and outlet of the through plate, standard values ​​for position deviation at the DS inlet and outlet of the through plate, standard values ​​for rolling force deviation on both sides of the backup pressure sensor when calibration is successful, standard values ​​for changes in OS inlet and outlet deviation when steel bites, and standard values ​​for changes in DS inlet and outlet deviation when steel bites.

[0017] The mill precision monitoring system also includes a component for acquiring actual mill precision monitoring values. These actual mill precision monitoring values ​​include: actual mill stiffness retention rate, actual mill calibration and leveling value, actual stiffness deviation on both sides of the calibrated OS / DS, actual position deviation on both sides of the calibrated OS / DS, actual OS inlet / outlet position deviation, actual DS inlet / outlet position deviation, actual rolling force deviation on both sides of the backup pressure sensor when calibration is successful, actual OS inlet / outlet deviation change during steel biting, and actual DS inlet / outlet deviation change during steel biting.

[0018] The mill precision monitoring system stores the following standard values ​​for mill precision monitoring: mill stiffness retention rate standard value ≥90%, mill calibration leveling value standard value, R1-R2≤1.5mm, F1-F2 stands≤0.5mm, F3-F7 stands≤0.3mm, standard value for stiffness deviation on both sides of calibration OS / DS ≤200KN / mm, standard value for position deviation on both sides of calibration OS / DS ≤2mm, standard value for position deviation of OS inlet / outlet of through plate ≤2mm, standard value for position deviation of DS inlet / outlet of through plate ≤2mm, standard value for rolling force deviation on both sides of backup pressure sensor when calibration is successful ≤1000KN, standard value for change of OS inlet / outlet deviation during steel biting ≤1.0mm, and standard value for change of DS inlet / outlet deviation during steel biting ≤1.0mm.

[0019] The present invention also relates to a rolling mill structure that is simple in structure, can effectively improve the monitoring accuracy of the rolling mill, keep the rolling mill accuracy within a controllable range, effectively improve the rolling line capacity, realize the rolling stability and rolling efficiency of high-strength, thin-gauge products, and improve the rolling quality of products.

[0020] The mill structure includes an upper body of the mill stand, an upper pressure plate, an upper stepped plate, an HGC cylinder, a PT, a bearing seat pressure plate, an upper support roll bearing seat, an upper work roll bearing seat, a work roll axial locking U-groove, a bearing seat liner, a work roll mill stand liner, a work roll CVC block, a lower work roll bearing seat, a lower support roll bearing seat, a support roll axial locking ear plate, a support roll bearing seat liner, a support roll mill stand liner, a rocker plate, a lower stepped plate, an upper liner of the slide block, a slide block, a lower liner of the slide block, a pressure cover, an upper equalizing plate, an LC, a lower equalizing plate, a base, and a lower body of the mill stand.

[0021] The aforementioned

[0022] The key factors for the actual value of the mill stiffness retention rate are: vertical bearing components, mainly: lower arch body, lower step plate, lower pressure plate, upper step plate, and upper pressure plate; the key factors for the actual value of the mill calibration leveling value are: horizontal rolling direction bearing components, mainly: work roll arch liner, support roll bearing seat liner, and lower step plate; the key factors for the actual value of the calibration OS / DS stiffness deviation are: vertical bearing components, mainly: lower step plate, lower pressure plate, lower arch body, lower support roll bearing seat, rocker plate, and LC; the key factors for the actual value of the calibration OS / DS position deviation are: vertical bearing components, mainly: lower step plate, lower pressure plate, upper step plate, and upper pressure plate; the key factors for the actual value of the OS inlet / outlet position deviation are: vertical bearing components, mainly: upper... The key factors for the actual value of the deviation of the DS inlet and outlet positions of the through plate are: vertical bearing components, the main factors being: upper pressure plate, HGC cylinder pressure plate, upper support roller bearing seat, and bearing seat pressure plate; the key factors for the actual value of the deviation of the rolling force on both sides of the spare pressure sensor when calibration is successful are: vertical bearing components, the main factors being: lower step plate, lower pressure plate, lower body of the archway, and HGC cylinder; the key factors for the actual value of the change of OS inlet and outlet deviation when biting steel are: horizontal rolling direction bearing components, the main factors being: upper pressure plate, work roll archway liner, and support roller bearing seat liner; the key factors for the actual value of the change of DS inlet and outlet deviation when biting steel are: horizontal rolling direction bearing components, the main factors being: upper pressure plate, work roll archway liner, and support roller bearing seat liner.

[0023] The working principle and beneficial effects of the technical solution adopted in this invention are as follows:

[0024] The rolling mill structure, rolling mill accuracy monitoring system, and monitoring method described in this invention address the core aspects of improving equipment management and product quality in hot strip rolling mills. Managing rolling mill accuracy is a crucial means to stabilize production and enhance the production capacity of hot-rolled limit products. This invention clarifies the components and influencing factors of rolling mill accuracy, utilizes a monitoring system to establish a monitoring and evaluation framework, and establishes corresponding adjustment and recovery methods to stabilize rolling mill accuracy, thereby achieving stable rolling and improved efficiency. The accuracy score of key equipment on the mill stand is ≥85. Attached Figure Description

[0025] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0026] Figure 1 This is a schematic diagram of the rolling mill structure described in this invention;

[0027] Figure 2 The range of rolling mill accuracy parameters as described in this invention;

[0028] Figure 3 This refers to the mill accuracy scoring standard data described in this invention;

[0029] Figure 4 These are the main factor determination parameters for the rolling mill accuracy factors described in this invention;

[0030] Figure 5 This is a schematic diagram of the rolling mill accuracy determination process described in this invention;

[0031] Figure 6 These are the scoring parameters for rolling mills in the existing technology;

[0032] Figure 7 The scoring parameters for a rolling mill employing the technical solution of this invention;

[0033] The labels in the attached diagram are as follows: 1. Upper body of the archway; 2. Upper pressure plate; 3. Upper step plate; 4. HGC cylinder; 5. PT; 6. Bearing seat pressure plate; 7. Upper support roller bearing seat; 8. Upper work roller bearing seat; 9. Work roller axial locking U-groove; 10. Bearing seat liner; 11. Work roller archway liner (work roller archway window liner); 12. Lower work roller bearing seat; 13. Lower support roller bearing seat; 14. Support roller axial locking ear plate; 15. Support roller bearing seat liner; 16. Support roller archway liner; 17. Shaking plate; 18. Lower step plate; 19. Upper liner of the slide block; 20. Slide block; 21. Lower liner of the slide block; 22. Pressure cap; 23. Upper equalizing plate; 24. LC; 25. Lower equalizing plate; 26. Base; 27. Lower body of the archway; 28. Work roller CVC block. Detailed Implementation

[0034] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0035] As attached Figure 1 As shown, this invention relates to a monitoring method for a rolling mill precision monitoring system. The monitoring steps of the method are as follows:

[0036] S1. The mill precision monitoring system stores and sets standard values ​​for mill precision monitoring, including standard values ​​for mill stiffness retention rate, mill calibration and leveling values, standard values ​​for stiffness deviation on both sides of the calibrated OS / DS, standard values ​​for position deviation on both sides of the calibrated OS / DS, standard values ​​for position deviation at the OS inlet / outlet of the through-plate, standard values ​​for position deviation at the DS inlet / outlet of the through-plate, standard values ​​for rolling force deviation on both sides of the backup pressure sensor when calibration is successful, standard values ​​for changes in OS inlet / outlet deviation during steel biting, and standard values ​​for changes in DS inlet / outlet deviation during steel biting; S2. The mill precision monitoring system includes a component for acquiring actual mill precision monitoring values. The actual mill precision monitoring values ​​include actual values ​​for mill stiffness retention rate, actual values ​​for mill calibration and leveling values, actual values ​​for stiffness deviation on both sides of the calibrated OS / DS, actual values ​​for position deviation on both sides of the calibrated OS / DS, actual values ​​for position deviation at the OS inlet / outlet of the through-plate, and actual values ​​for position deviation at the DS inlet / outlet of the through-plate, and the backup pressure sensor when calibration is successful. The actual values ​​of the rolling force deviation on both sides of the sensor, the actual values ​​of the OS inlet / outlet deviation changes during steel biting, and the actual values ​​of the DS inlet / outlet deviation changes during steel biting; S3. The mill accuracy monitoring system compares each standard value with the corresponding actual value, and based on the set evaluation system, determines the mill stiffness retention rate, mill calibration leveling value, calibration OS / DS stiffness deviation on both sides, calibration OS / DS position deviation on both sides, through plate OS inlet / outlet position deviation, through plate DS inlet / outlet position deviation, and, when calibration is successful, the scores for the rolling force deviation on both sides of the backup pressure sensor, the OS inlet / outlet deviation changes during steel biting, and the DS inlet / outlet deviation changes during steel biting, respectively, to obtain a comprehensive mill accuracy score; S4. When calibration is successful, if the actual value of the rolling force deviation on both sides of the backup pressure sensor is greater than or equal to five times the standard value of the rolling force deviation on both sides of the backup pressure sensor, the mill accuracy monitoring system determines the comprehensive score to be 0, and the mill accuracy is unqualified; if the comprehensive score is above 85, the mill accuracy is qualified. The above steps address the shortcomings of the existing technology and propose an improved technical solution. Mill precision is a core element in improving equipment management and product quality in hot strip mills. Managing mill precision is crucial for stable production and enhancing the production capacity of high-performance hot-rolled products. This invention clarifies the components and influencing factors of mill precision, establishes a monitoring and evaluation system and corresponding adjustment and recovery methods using a monitoring system, and stabilizes mill precision to achieve stable rolling and improved efficiency. The precision score of key equipment on the mill stand is ≥85. The monitoring method of the mill precision monitoring system described in this invention is simple in procedure, effectively improves mill monitoring precision, maintains mill precision within a controllable range, effectively increases rolling line capacity, achieves rolling stability and efficiency in the production of high-strength, thin-gauge products, and improves product rolling quality.

[0037] The scoring criteria for the mill stiffness retention rate are as follows: >90%, 10 points; 90%~85%, 8 points; 85%-80%, 6 points; 80%-70%, 3 points; <70%, 0 points. The scoring criteria for the mill calibration leveling value are as follows: Actual leveling value <1.5, 10 points; 1.5~1.8, 8 points; 1.8~2.0, 6 points; 2.0~2.5, 2.5 points. >2.5 scores 0 points; F1-F2 calibration and leveling value <0.5 scores 10 points; 0.5~0.8 scores 8 points; 0.8~1.0 scores 6 points; 1.0~1.2 scores 2.5 points; >1.2 scores 0 points; F3-F7 calibration and leveling value <0.3 scores 10 points; 0.3~0.5 scores 8 points; 0.5~0.8 scores 6 points; 0.8~1.0 scores 2.5 points; >1.0 scores 0 points. A score >90 is excellent (normal); 85-90 is good (normal); <85 is unqualified (abnormal analysis and adjustment).

[0038] The scoring criteria for calibrating the stiffness deviation on both sides of OS / DS are as follows: 40 points for actual values ​​<200; 32 points for 200~300; 24 points for 300~500; 20 points for 500~800; 10 points for 800~1000; and 0 points for >1000.

[0039] The scoring criteria for the positional deviation of the OS / DS sides are as follows: Actual value <1.0, 5 points; 1.0~1.5, 4 points; 1.5~2.0, 3 points; 2.0~2.5, 2 points; >2.5, 0 points. The scoring criteria for the positional deviation of the OS entrance / exit of the through-plate are as follows: Actual value <1.0, 10 points; 1.0~1.5, 8 points; 1.5~2.0, 6 points; 2.0~2.5, 4 points; >2.0, 0 points. The scoring criteria for the positional deviation of the DS entrance / exit of the through-plate are as follows: Actual value <1.0, 10 points; 1.0~1.5, 8 points; 1.5~2.0, 6 points; 2.0~2.5, 4 points; >2.0, 0 points.

[0040] The scoring criteria for the rolling force deviation on both sides of the backup pressure sensor when calibration is successful are as follows: actual value ≤1000KN, 5 points; 1000~1500KN, 4 points; 1500~2000KN, 3 points; 2000~3000KN, 2 points; >3000KN, 0 points. The scoring criteria for the change in OS inlet / outlet deviation during steel biting are as follows: actual value ≤0.5mm, 5 points; 0.5~1mm, 3 points; 1~1.5, 1 point; >1.5, 0 points. The scoring criteria for the change in DS inlet / outlet deviation during steel biting are as follows: actual value ≤0.5mm, 5 points; 0.5~1mm, 3 points; 1~1.5, 1 point; >1.5, 0 points.

[0041] After each change of the work roll, the mill shall be zero-adjusted and calibrated. If the stiffness deviation on both sides of the OS / DS calibration exceeds 200KN / mm, check the vertical bearing components. If the average fluctuation of the rolling force deviation on both sides of the spare pressure sensor is greater than 5% when the calibration is successful, check the horizontal gap of the roll crossing and the horizontal bearing components.

[0042] This invention also relates to a simple rolling mill precision monitoring system that can effectively improve the monitoring accuracy of rolling mills, maintain the rolling mill precision within a controllable range, effectively increase the rolling line capacity, achieve rolling stability and efficiency in the production of high-strength, thin-gauge products, and improve the rolling quality of products. The rolling mill precision monitoring system stores standard values ​​for rolling mill precision monitoring, including standard values ​​for rolling mill stiffness retention rate, standard values ​​for rolling mill calibration and leveling values, standard values ​​for stiffness deviation on both sides of calibration OS / DS, standard values ​​for position deviation on both sides of calibration OS / DS, standard values ​​for position deviation at the OS inlet and outlet of the through plate, standard values ​​for position deviation at the DS inlet and outlet of the through plate, standard values ​​for rolling force deviation on both sides of the backup pressure sensor when calibration is successful, standard values ​​for changes in OS inlet and outlet deviation when steel bites, and standard values ​​for changes in DS inlet and outlet deviation when steel bites.

[0043] The mill precision monitoring system also includes a component for acquiring actual mill precision monitoring values. These actual mill precision monitoring values ​​include: actual mill stiffness retention rate, actual mill calibration and leveling value, actual stiffness deviation on both sides of the calibrated OS / DS, actual position deviation on both sides of the calibrated OS / DS, actual OS inlet / outlet position deviation, actual DS inlet / outlet position deviation, actual rolling force deviation on both sides of the backup pressure sensor when calibration is successful, actual OS inlet / outlet deviation change during steel biting, and actual DS inlet / outlet deviation change during steel biting.

[0044] The mill precision monitoring system stores the following standard values ​​for mill precision monitoring: mill stiffness retention rate standard value ≥90%, mill calibration leveling value standard value, R1-R2≤1.5mm, F1-F2 stands≤0.5mm, F3-F7 stands≤0.3mm, standard value for stiffness deviation on both sides of calibration OS / DS ≤200KN / mm, standard value for position deviation on both sides of calibration OS / DS ≤2mm, standard value for position deviation of OS inlet / outlet of through plate ≤2mm, standard value for position deviation of DS inlet / outlet of through plate ≤2mm, standard value for rolling force deviation on both sides of backup pressure sensor when calibration is successful ≤1000KN, standard value for change of OS inlet / outlet deviation during steel biting ≤1.0mm, and standard value for change of DS inlet / outlet deviation during steel biting ≤1.0mm.

[0045] The present invention also relates to a rolling mill structure that is simple in structure, can effectively improve the monitoring accuracy of the rolling mill, keep the rolling mill accuracy within a controllable range, effectively improve the rolling line capacity, realize the rolling stability and rolling efficiency of high-strength, thin-gauge products, and improve the rolling quality of products.

[0046] The mill structure includes an upper body 1, an upper pressure plate 2, an upper step plate 3, an HGC cylinder 4 (HGC, Hydraulicgap adjustment-pressure control), a PT5 (Position transducer), a bearing seat pressure plate 6, an upper support roll bearing seat 7, an upper work roll bearing seat 8, a work roll axial locking U-groove 9, a bearing seat liner 10, a work roll mill liner 11, and a work roll CVC block 28 (CVC, Continuously Variable CVC). Crown (roller moving block), lower working roll bearing seat 12, lower support roll bearing seat 13, support roll axial locking ear plate 14, support roll bearing seat liner 15, support roll arch liner 16, rocking plate 17, lower step plate 18, upper slide liner 19, slide 20, lower slide liner 21, pressure cover 22, upper pressure equalizing plate 23, LC 24 (LC, Loadcell, pressure sensor), lower pressure equalizing plate 25, base 26, lower arch body 27.

[0047] The key factors for the actual value of the mill stiffness retention rate are: vertical bearing components, mainly the lower body of the arch, lower step plate, lower pressure plate, upper step plate, and upper pressure plate; the key factors for the actual value of the mill calibration leveling value are: horizontal rolling direction bearing components, mainly the work roll arch liner, support roll bearing seat liner, and lower step plate; the key factors for the actual value of the stiffness deviation on both sides of the OS / DS calibration are: vertical bearing components, mainly the lower step plate, lower pressure plate, lower arch body, lower support roll bearing seat, rocker plate, and LC; the key factors for the actual value of the position deviation on both sides of the OS / DS calibration are: vertical bearing components, mainly the lower step plate, lower pressure plate, upper step plate, and upper pressure plate; the key factors for the actual value of the OS inlet / outlet position deviation of the through plate are: vertical bearing components, mainly the... The key factors for the actual value of the deviation of the DS inlet and outlet positions of the through plate are: the vertical bearing components, the main factors being: the upper pressure plate, the HGC cylinder pressure plate, the upper support roller bearing seat, and the bearing seat pressure plate; the key factors for the actual value of the deviation of the rolling force on both sides of the spare pressure sensor when calibration is successful are: the vertical bearing components, the main factors being: the lower step plate, the lower pressure plate, the lower body of the archway, and the HGC cylinder; the key factors for the actual value of the change in the OS inlet and outlet deviation during steel biting are: the horizontal rolling direction bearing components, the main factors being: the upper pressure plate, the work roll archway liner, and the support roller bearing seat liner; the key factors for the actual value of the change in the DS inlet and outlet deviation during steel biting are: the horizontal rolling direction bearing components, the main factors being: the upper pressure plate, the work roll archway liner, and the support roller bearing seat liner.

[0048] To further illustrate the principles, structure, and methods of this application, taking the accuracy evaluation and adjustment of the R1 stand equipment of a 2250 rolling mill as an example, the invention is further explained as follows: Before adopting the technical solution of this invention, the rolling mill score was abnormal, below 85 points. Online evaluation of the scoring trends of each sub-item: affecting DS inlet / outlet position deviation, stiffness retention rate, leveling value, stiffness difference between the two sides, DS bite deviation, and rolling force deviation. Online evaluation of the scoring percentage of each sub-item: stiffness difference between the two sides 20%, DS inlet / outlet position deviation 10%, stiffness retention rate 10%, leveling value 10%, DS bite deviation 3%, and rolling force deviation 2%. Analysis of the variability of support roll bearing housing / work roll bearing housing / rolling mill step position: the support roll bearing housing is abnormal, and the rolling mill step position has little impact. One-click analysis of rolling mill accuracy identifies the end factors: support roll bearing housing (number RB00047 / 37) and work roll bearing housing (RW00181 / 8101) are end factors, added to the blacklist, and subjected to accuracy detection and recovery. By adopting the technical solution of this invention, after replacing the support rolls and work rolls, the mill (stand) was evaluated, and the stand score returned to the normal level of 88 points. A comparison between existing technology and the improved mill demonstrates that the technical solution of this invention can effectively solve the problems of the prior art.

[0049] The rolling mill structure, rolling mill accuracy monitoring system, and monitoring method described in this invention address the core aspects of improving equipment management and product quality in hot strip rolling mills. Managing rolling mill accuracy is a crucial means to stabilize production and enhance the production capacity of hot-rolled limit products. This invention clarifies the components and influencing factors of rolling mill accuracy, utilizes a monitoring system to establish a monitoring and evaluation framework, and establishes corresponding adjustment and recovery methods to stabilize rolling mill accuracy, thereby achieving stable rolling and improved efficiency. The accuracy score of key equipment on the mill stand is ≥85.

[0050] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A monitoring method for a rolling mill precision monitoring system, characterized in that: The monitoring steps of the monitoring method of the aforementioned rolling mill precision monitoring system are as follows: S1. The mill precision monitoring system stores and sets mill precision monitoring standard values, including mill stiffness retention rate standard value, mill calibration leveling value standard value, calibration OS / DS stiffness deviation standard value, calibration OS / DS position deviation standard value, through plate OS inlet / outlet position deviation standard value, through plate DS inlet / outlet position deviation standard value, backup pressure sensor rolling force deviation standard value when calibration is successful, OS inlet / outlet deviation change standard value when steel bites, and DS inlet / outlet deviation change standard value when steel bites. S2. The mill precision monitoring system includes a mill precision monitoring actual value acquisition component. The actual values ​​of mill precision monitoring include the actual value of mill stiffness retention rate, the actual value of mill calibration leveling value, the actual value of stiffness deviation on both sides of calibration OS / DS, the actual value of position deviation on both sides of calibration OS / DS, the actual value of position deviation of OS inlet and outlet of through plate, the actual value of position deviation of DS inlet and outlet of through plate, the actual value of rolling force deviation on both sides of the backup pressure sensor when calibration is successful, the actual value of OS inlet and outlet deviation change when steel bites, and the actual value of DS inlet and outlet deviation change when steel bites. S3. The mill accuracy monitoring system compares each standard value with the corresponding actual value. Based on the set evaluation system, it determines the scores for mill stiffness retention rate, mill calibration leveling value, stiffness deviation on both sides of calibration OS / DS, position deviation on both sides of calibration OS / DS, position deviation of OS inlet and outlet of through plate, position deviation of DS inlet and outlet of through plate, rolling force deviation on both sides of backup pressure sensor when calibration is successful, change of OS inlet and outlet deviation when biting steel, and change of DS inlet and outlet deviation when biting steel, and obtains a comprehensive mill accuracy score. S4. When the calibration is successful, if the actual value of the rolling force deviation on both sides of the backup pressure sensor is greater than or equal to the standard value of the rolling force deviation on both sides of the backup pressure sensor, the mill accuracy monitoring system determines the comprehensive score to be 0, and the mill accuracy is unqualified; if the comprehensive score is above 85, the mill accuracy is qualified.

2. The monitoring method of the rolling mill precision monitoring system according to claim 1, characterized in that: The scoring criteria for the mill stiffness retention rate are as follows: >90%, 10 points; 90%~85%, 8 points; 85%-80%, 6 points; 80%-70%, 3 points; <70%, 0 points; The scoring criteria for the mill calibration leveling value are as follows: If the actual leveling value is <1.5, 10 points are awarded. 1.5~1.8, 8 points; 1.8~2.0, 6 points; 2.0~2.5, 2.5 points; >2.5, 0 points; F1-F2 calibration leveling value <0.5, 10 points; 0.5~0.8, 8 points; 0.8~1.0, 6 points; 1.0~1.2, 2.5 points; >1.2, 0 points; F3-F7 calibration leveling value <0.3, 10 points. 0.3~0.5, 8 points; 0.5~0.8, 6 points; 0.8~1.0, 2.5 points; >1.0, 0 points.

3. The monitoring method of the rolling mill precision monitoring system according to claim 2, characterized in that: The scoring criteria for calibrating the stiffness deviation on both sides of OS / DS are as follows: actual value <200, score 40 points; 200~300, score 32 points; 300~500, score 24 points; 500~800, score 20 points; 800~1000, score 10 points. >1000 points = 0 points.

4. The monitoring method of the rolling mill precision monitoring system according to claim 3, characterized in that: The scoring criteria for the positional deviation of the OS / DS sides are as follows: actual value <1.0, score 5 points; 1.0~1.5, score 4 points; 1.5~2.0, score 3 points; 2.0~2.5, score 2 points; >2.5, score 0 points; the scoring criteria for the positional deviation of the OS entrance and exit of the through board are as follows: actual value <1.0, score 10 points. 1.0~1.5, 8 points; 1.5~2.0, 6 points; 2.0~2.5, 4 points; >2.0, 0 points; Scoring criteria for the deviation of the DS entrance and exit position of the through board: actual value <1.0, 10 points; 1.0~1.5, 8 points; 1.5~2.0, 6 points; 2.0~2.5, 4 points; >2.0, 0 points.

5. The monitoring method of the rolling mill precision monitoring system according to claim 4, characterized in that: The scoring criteria for the rolling force deviation on both sides of the backup pressure sensor when calibration is successful are as follows: actual value ≤1000KN, 5 points; 1000~1500KN, 4 points; 1500~2000KN, 3 points; 2000~3000KN, 2 points; >3000KN, 0 points. The scoring criteria for the change in OS inlet and outlet deviation during steel biting are as follows: actual value ≤0.5mm, 5 points; 0.5~1mm, 3 points; 1~1.5, 1 point; >1.5, 0 points. The scoring criteria for the change in DS inlet and outlet deviation during steel biting are as follows: actual value ≤0.5mm, 5 points; 0.5~1mm, 3 points; 1~1.5, 1 point; >1.5, 0 points.

6. The monitoring method of the rolling mill precision monitoring system according to claim 5, characterized in that: After each change of the work roll, the mill shall be zero-adjusted and calibrated. If the stiffness deviation on both sides of the OS / DS calibration exceeds 200KN / mm, check the vertical bearing components. If the average fluctuation of the rolling force deviation on both sides of the spare pressure sensor is greater than 5% when the calibration is successful, check the horizontal gap of the roll crossing and the horizontal bearing components.

7. The mill precision monitoring system according to the monitoring method of the mill precision monitoring system according to any one of claims 1 to 6, characterized in that: The mill accuracy monitoring system stores standard values ​​for mill accuracy monitoring, including standard values ​​for mill stiffness retention rate, standard values ​​for mill calibration and leveling value, standard values ​​for stiffness deviation on both sides of calibration OS / DS, standard values ​​for position deviation on both sides of calibration OS / DS, standard values ​​for position deviation at OS inlet and outlet of through plate, standard values ​​for position deviation at DS inlet and outlet of through plate, standard values ​​for rolling force deviation on both sides of backup pressure sensor when calibration is successful, standard values ​​for changes in OS inlet and outlet deviation when steel bites, and standard values ​​for changes in DS inlet and outlet deviation when steel bites. The mill precision monitoring system also includes a component for acquiring actual mill precision monitoring values. These actual mill precision monitoring values ​​include: actual mill stiffness retention rate, actual mill calibration and leveling value, actual stiffness deviation on both sides of the calibrated OS / DS, actual position deviation on both sides of the calibrated OS / DS, actual OS inlet / outlet position deviation, actual DS inlet / outlet position deviation, actual rolling force deviation on both sides of the backup pressure sensor when calibration is successful, actual OS inlet / outlet deviation change during steel biting, and actual DS inlet / outlet deviation change during steel biting.

8. The mill precision monitoring system according to claim 7, characterized in that: The mill precision monitoring system stores the following standard values ​​for mill precision monitoring: mill stiffness retention rate standard value ≥90%, mill calibration leveling value standard value, R1-R2≤1.5mm, F1-F2 stands≤0.5mm, F3-F7 stands≤0.3mm, standard value for stiffness deviation on both sides of calibration OS / DS ≤200KN / mm, standard value for position deviation on both sides of calibration OS / DS ≤2mm, standard value for position deviation of OS inlet / outlet of through plate ≤2mm, standard value for position deviation of DS inlet / outlet of through plate ≤2mm, standard value for rolling force deviation on both sides of backup pressure sensor when calibration is successful ≤1000KN, standard value for change of OS inlet / outlet deviation during steel biting ≤1.0mm, and standard value for change of DS inlet / outlet deviation during steel biting ≤1.0mm.

9. The mill structure of the monitoring method of the mill precision monitoring system according to any one of claims 1 to 6, characterized in that: The mill structure includes the upper body of the archway (1), upper pressure plate (2), upper step plate (3), HGC cylinder (4), PT (5), bearing seat pressure plate (6), upper support roll bearing seat (7), upper work roll bearing seat (8), work roll axial locking U groove (9), bearing seat liner (10), work roll archway liner (11), work roll CVC block (28), lower work roll bearing seat (12), lower support roll bearing seat (13), support roll axial locking ear plate (14), support roll bearing seat liner (15), support roll archway liner (16), rocker plate (17), lower step plate (18), upper liner of slide (19), slide (20), lower liner of slide (21), pressure cover (22), upper equalizing plate (23), LC (24), lower equalizing plate (25), base (26), and lower body of the archway (27).

10. The rolling mill structure according to claim 9, characterized in that: The key factors for the actual value of the mill stiffness retention rate are: vertical bearing components, mainly: lower arch body, lower step plate, lower pressure plate, upper step plate, and upper pressure plate; the key factors for the actual value of the mill calibration leveling value are: horizontal rolling direction bearing components, mainly: work roll arch liner, support roll bearing seat liner, and lower step plate; the key factors for the actual value of the calibration OS / DS stiffness deviation are: vertical bearing components, mainly: lower step plate, lower pressure plate, lower arch body, lower support roll bearing seat, rocker plate, and LC; the key factors for the actual value of the calibration OS / DS position deviation are: vertical bearing components, mainly: lower step plate, lower pressure plate, upper step plate, and upper pressure plate; the key factors for the actual value of the OS inlet / outlet position deviation are: vertical bearing components, mainly: upper... The key factors for the actual value of the deviation of the DS inlet and outlet positions of the through plate are: vertical bearing components, the main factors being: upper pressure plate, HGC cylinder pressure plate, upper support roller bearing seat, and bearing seat pressure plate; the key factors for the actual value of the deviation of the rolling force on both sides of the spare pressure sensor when calibration is successful are: vertical bearing components, the main factors being: lower step plate, lower pressure plate, lower body of the archway, and HGC cylinder; the key factors for the actual value of the change of OS inlet and outlet deviation when biting steel are: horizontal rolling direction bearing components, the main factors being: upper pressure plate, work roll archway liner, and support roller bearing seat liner; the key factors for the actual value of the change of DS inlet and outlet deviation when biting steel are: horizontal rolling direction bearing components, the main factors being: upper pressure plate, work roll archway liner, and support roller bearing seat liner.

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