A closed-loop control system and method for plate shape during transverse variable tensile stress rolling of plates and strips

Abstract

The present invention provides a closed-loop control system and method for plate shape during transverse variable tension stress rolling of plates and strips, which applies axial variable tension rollers to the closed-loop control system for plate shape of plates and strips, determines the composition and integration method of the transverse variable tension stress rolling technology for plates and strips and the existing closed-loop control system for plate shape, clarifies the isolation method of axial variable tension stress plate shape control from plate shape detection and tension control during coiling, and provides a solution for the application of transverse variable tension stress rolling technology. The present invention proposes a new strategy and composition for closed-loop control of transverse variable tension stress plate shape, which effectively solves the problems of narrow application range of existing plate shape control means, insufficient high-order plate shape control capability, and interference of local tensile stress control on plate shape measurement and coiling stress, and is conducive to giving full play to the control efficiency of transverse variable tension stress rolling technology on complex high-order plate shapes of high-quality plates, strips, and foils, and can effectively promote the application and implementation of transverse variable tension stress rolling technology in plate shape control of plates and strips.

Description

Technical Field

[0001] The present invention belongs to the technical field of plate and strip shape control, and in particular relates to a plate shape closed-loop control system and method for transverse variable tensile stress rolling of a plate and strip. Background Art

[0002] Plate and strip are widely used in various industries that are crucial to national economy and people's livelihoods. They are extremely important basic materials, and flatness (flatness) is a key indicator for evaluating plate and strip quality. High-quality and high-performance plates and strips, such as those for home appliance steel, automotive steel, tin-coated steel, and silicon steel strip, are becoming increasingly harder and thinner. This increasingly complex flatness problem is becoming a persistent problem affecting the quality of precision high-strength foil and strip. Therefore, efficiently controlling the complex flatness of precision high-strength plates, strips, and foils is becoming an increasingly important and challenging issue in the research of shape control for precision foil and strip.

[0003] Traditional plate shape control methods mainly include roll bending, roll shifting, roll tilting, segmented cooling, and segmented adjustment of support rolls. However, the scope of this plate shape control method is limited and cannot meet actual needs. Therefore, a segmented expandable bladder support method is used to construct the structure, connection, and assembly method of the transverse and axial variable tension rollers. However, the transverse zone tension adjustment not only affects the measurement accuracy of the plate shape meter, but also interferes with the deviation between stands and passes. Therefore, how to transform the key structure of the tension control system to achieve the integration of the axial variable tension roller with the existing cold rolling plate shape closed-loop control system, and how to control the axial variable tension roller under different layout situations are the key factors that restrict the effectiveness of transverse variable tension stress rolling plate shape control, and are also important aspects that promote the development and application of transverse variable tension stress plate shape control technology. Summary of the Invention

[0004] In order to address the shortcomings and deficiencies of the existing technology, a closed-loop plate shape control system and method for transverse variable tensile stress rolling of plates and strips are provided, which can solve the problems of narrow application range of existing plate shape control means, insufficient high-order plate shape control ability, and interference of local tensile stress control on plate shape measurement and coiling stress.

[0005] In order to achieve the purpose of the present invention, a plate shape closed-loop control system for transverse variable tensile stress rolling of plates and strips is provided, which includes a multi-roll rolling mill for realizing the rolling of plates and strips. The two ends of the multi-roll rolling mill are respectively provided with an opener / coiler and a coiler for uncoiling and winding the plates and strips. The multi-roll rolling mill controls the plate shape of the plates and strips by using tilting rolls, bending roll force, shifting rolls (roller shape), segmented cooling of rolling rolls, segmented adjustment of support rolls, and transverse zoned tensile stress control. Axial variable tension rolls and plate shape meters are provided on the running path of the plates and strips for realizing plate shape control and detection of the plates and strips. Guide S rollers are provided on the running path of the plates and strips for isolating the tensile stress of the plates and strips.

[0006] As a further improvement of the above scheme, the multi-roll rolling mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to achieve plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the opener / coiler and the single-stand cold rolling mill, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the coiler, and is used to isolate the tensile stress on the plate and strip.

[0007] As a further improvement of the above scheme, the multi-roller rolling mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to achieve plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0008] As a further improvement of the above scheme, the multi-roller rolling mill is a single-frame cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-frame cold rolling mill. The axial variable tension roller is arranged between the single-frame cold rolling mill and the coiler, and is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. One of the plate shape meters is arranged between the opener / coiler and the single-frame cold rolling mill, and the other plate shape meter is arranged between the axial variable tension roller and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the other plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0009] As a further improvement of the above scheme, the multi-roller rolling mill is a single-frame cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-frame cold rolling mill. The axial variable tension rollers are respectively provided on the left and right sides of the single-frame cold rolling mill, and are used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The two plate shape meters are respectively provided between the opener / coiler and the axial variable tension roller on the left side of the single-frame cold rolling mill, and between the coiler and the axial variable tension roller on the right side of the single-frame cold rolling mill, for realizing plate shape detection of the plate and strip. The guide S rollers are respectively provided between the axial variable tension roller on the left side of the single-frame cold rolling mill and the plate shape meter, and between the axial variable tension roller on the right side of the single-frame cold rolling mill and the plate shape meter, for isolating the tensile stress on the plate and strip.

[0010] As a further improvement of the above scheme, the multi-roller rolling mill is a multi-stand cold rolling mill and the multi-stand cold rolling mill is respectively provided with an open / reeler and a coiler on the left and right sides. The right side of the i-th cold rolling mill in the multi-stand cold rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller of the last stand and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0011] As a further improvement of the above scheme, the multi-roller rolling mill is a multi-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the multi-stand cold rolling mill. The right side of the i-th cold rolling mill in the multi-stand cold rolling mill is provided with an i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. One of the plate shape meters is arranged between the first cold rolling mill and the opener / coiler, and the other plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, which is used to realize plate shape detection of the plate and strip.

[0012] As a further improvement of the above scheme, the multi-roller rolling mill is a multi-stand hot rolling mill and a plate shape meter and a coiler are sequentially arranged at the outlet of the multi-stand hot rolling mill. The plate shape meter adopts a non-contact plate shape meter. The material at the inlet of the multi-stand hot rolling mill comes from the upstream hot rolling rough rolling mill. The right side of the i-th hot rolling mill in the multi-stand hot rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0013] As a further improvement of the above solution, guide rollers are provided on the running path of the plate and strip to ensure that the plate and strip material fits tightly with the axial variable tension roller and the plate shape meter.

[0014] A method for performing closed-loop control of plate shape by a closed-loop plate shape control system, comprising the following specific steps:

[0015] Step 1: Use the shape meter to periodically sample and measure the longitudinal residual stress σ inside the plate and strip y The distribution of the longitudinal residual stress is calculated and the difference between the target residual stress and the measured longitudinal residual stress is obtained as the plate shape control deviation;

[0016] Step 2: Perform flatness pattern recognition and decompose the flatness control deviation into 1st-4th order and other higher order control components;

[0017] Step 3: Calculate the plate shape control and regulation quantity including the axial variable tension roller. Using the influence matrix method or the plate shape control efficiency coefficient method, calculate the tilting roll, bending roll force, shifting roll (roller shape), roller segment cooling, support roll segment adjustment, and transverse zone tensile stress control and regulation quantity vectors according to the plate shape deviation discrete vector, and perform automatic control. Among them, the transverse zone tensile stress is regulated by the axial variable tension roller, which is achieved by regulating the voltage or current of the solenoid valve or servo valve of the hydraulic or pneumatic system, thereby controlling the pressure in each channel of the capsule, and ultimately affecting the change of the local tensile stress of the plate and strip partition;

[0018] Step 4: Repeat steps 1-3, cyclically sample the flatness value, calculate the flatness deviation, perform flatness pattern recognition, control the adjustment amount of the plate and strip, and realize flatness regulation.

[0019] The beneficial effects of the present invention are:

[0020] Compared with the existing technology, the present invention provides a closed-loop control system and method for plate shape of transverse variable tension stress rolling of plates and strips, which applies axial variable tension rollers to the closed-loop control system of plate shape of plates and strips, determines the composition and integration method of the transverse variable tension stress rolling technology of plates and strips and the existing closed-loop control system of plate shape, clarifies the isolation method of axial variable tension stress plate shape control from plate shape detection and tension control of the coiling process, and provides a solution for the promotion and application of transverse variable tension stress rolling technology. The present invention proposes a new strategy and composition for closed-loop control of transverse variable tension stress plate shape, which effectively solves the problems of narrow application range of existing plate shape control means, insufficient high-order plate shape control capability, and interference of local tensile stress control on plate shape measurement and coiling stress. It is conducive to giving full play to the control efficiency of transverse variable tension stress rolling technology on complex high-order plate shapes of high-quality plates, strips, and foils, and can effectively promote the application and implementation of transverse variable tension stress rolling technology in plate shape control of plates and strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the principle of the plate shape closed-loop control system using the axial variable tension roller integration in the present invention.

[0022] Figure 2 This is a diagram showing the composition and function of the axial variable tension roller in the plate shape closed-loop control system of the present invention.

[0023] Figure 3 This is the principle block diagram of the plate shape negative feedback closed-loop control in the present invention.

[0024] Figure 4 This is the block diagram of the plate shape feedforward control principle in the present invention.

[0025] Figure 5 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 1 ,

[0026] Figure 6 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 2 ,

[0027] Figure 7 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 3 ,

[0028] Figure 8 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 4 ,

[0029] Figure 9 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 5 ,

[0030] Figure 10 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 6 ,

[0031] Figure 11 This is a schematic diagram of the arrangement of the multi-roll rolling mill when it is a single-stand cold rolling mill in the present invention. Figure 7 ,

[0032] Figure 12 This is a schematic diagram of the arrangement of the multi-roller rolling mill when the multi-stand cold rolling mill is used in the present invention. Figure 1 ,

[0033] Figure 13 This is a schematic diagram of the arrangement of the multi-roller rolling mill when the multi-stand cold rolling mill is used in the present invention. Figure 2 .

[0034] Figure 14 This is a schematic diagram of the arrangement of the multi-roller rolling mill when the multi-stand hot rolling mill is used in the present invention. Figure 1 . DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0036] like Figures 1-4 As shown, the present invention provides a closed-loop control system for plate shape of transverse variable tensile stress rolling of plates and strips, including a multi-roll mill for realizing the rolling of plates and strips, and an opener / coiler and a coiler are respectively provided at both ends of the multi-roll mill for uncoiling and winding the plates and strips. The multi-roll mill controls the plate shape of the plates and strips by using tilting rolls, bending roll force, shifting rolls (roller shape), segmented cooling of rolls, segmented adjustment of support rolls, and transverse zoned tensile stress control. Axial variable tension rolls and plate shape meters are provided on the running path of the plates and strips for realizing the plate shape control and detection of the plates and strips, and guide S rollers are provided on the running path of the plates and strips for isolating the tensile stress of the plates and strips.

[0037] like Figure 5-Figure 6 As shown, the multi-roll mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to achieve plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the opener / coiler and the single-stand cold rolling mill, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the coiler, and is used to isolate the tensile stress on the plate and strip.

[0038] like Figure 7-Figure 8 As shown, the multi-roll mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to achieve plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0039] like Figure 9-10 As shown, the multi-roller rolling mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to achieve plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. One of the plate shape meters is arranged between the opener / coiler and the single-stand cold rolling mill, and the other plate shape meter is arranged between the axial variable tension roller and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the other plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0040] like Figure 11 As shown, the multi-roller rolling mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension rollers are respectively provided on the left and right sides of the single-stand cold rolling mill, and are used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The two plate shape meters are respectively provided between the opener / coiler and the axial variable tension roller on the left side of the single-stand cold rolling mill, and between the coiler and the axial variable tension roller on the right side of the single-stand cold rolling mill, and are used to realize plate shape detection of the plate and strip. The guide S rollers are respectively provided between the axial variable tension roller on the left side of the single-stand cold rolling mill and the plate shape meter, and between the axial variable tension roller on the right side of the single-stand cold rolling mill and the plate shape meter, and are used to isolate the tensile stress on the plate and strip.

[0041] like Figure 12As shown, the multi-roller rolling mill is a multi-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the multi-stand cold rolling mill. The right side of the i-th cold rolling mill in the multi-stand cold rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller of the last stand and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0042] like Figure 13 As shown, the multi-roller rolling mill is a multi-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the multi-stand cold rolling mill. The right side of the i-th cold rolling mill in the multi-stand cold rolling mill is provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. One of the plate shape meters is arranged between the first cold rolling mill and the opener / coiler, and the other plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, which is used to realize plate shape detection of the plate and strip.

[0043] like Figure 14 As shown, the multi-roller rolling mill is a multi-stand hot rolling mill and a plate shape meter and a coiler are sequentially arranged at the outlet of the multi-stand hot rolling mill. The plate shape meter adopts a non-contact plate shape meter. The material at the inlet of the multi-stand hot rolling mill comes from the upstream hot rolling roughing mill. The right side of the i-th hot rolling mill in the multi-stand hot rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

[0044] At the same time, guide rollers are provided on the running path of the plate and strip to ensure that the plate and strip material fits tightly with the axial tension-varying roller and the plate shape meter.

[0045] A method for performing closed-loop control of plate shape by a closed-loop plate shape control system, comprising the following specific steps:

[0046] Step 1: Use the shape meter to periodically sample and measure the longitudinal residual stress σ inside the plate and strip y The distribution of the longitudinal residual stress is calculated and the difference between the target residual stress and the measured longitudinal residual stress is obtained as the plate shape control deviation;

[0047] Step 2: Perform flatness pattern recognition and decompose the flatness control deviation into 1st-4th order and other higher order control components;

[0048] Step 3: Calculate the plate shape control and regulation quantity including the axial variable tension roller. Using the influence matrix method or the plate shape control efficiency coefficient method, calculate the tilting roll, bending roll force, shifting roll (roller shape), roller segment cooling, support roll segment adjustment, and transverse zone tensile stress control and regulation quantity vectors according to the plate shape deviation discrete vector, and perform automatic control. Among them, the transverse zone tensile stress is regulated by the axial variable tension roller, which is achieved by regulating the voltage or current of the solenoid valve or servo valve of the hydraulic or pneumatic system, thereby controlling the pressure in each channel of the capsule, and ultimately affecting the change of the local tensile stress of the plate and strip partition;

[0049] Step 4: Repeat steps 1-3, cyclically sample the flatness value, calculate the flatness deviation, perform flatness pattern recognition, control the adjustment amount of the plate and strip, and realize flatness regulation.

[0050] The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments can be combined with each other to form new embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be included within the scope of the technical solutions of the present invention.

Claims

1. A closed-loop shape control system for transverse variable tensile stress rolling of a plate and strip, comprising a multi-roll mill for rolling the plate and strip, with an unwinder / reeler and a reeler provided at each end for unwinding and rewinding the plate and strip, respectively. The multi-roll mill controls the shape of the plate and strip by utilizing tilting rolls, bending roll force, roll shifting, segmented roll cooling, segmented support roll adjustment, and transverse zoned tensile stress control. The system is characterized by: The running path of the plate and strip is provided with an axial variable tension roller and a plate shape meter for realizing plate shape control and detection of the plate and strip; the running path of the plate and strip is provided with a guide S roller for isolating the tensile stress of the plate and strip; the multi-roller rolling mill is a single-frame cold rolling mill and an opener / reeler and a coiler are respectively provided on the left and right sides of the single-frame cold rolling mill; the axial variable tension roller is arranged between the single-frame cold rolling mill and the coiler for realizing plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip; the plate shape meter is arranged between the opener / reeler and the single-frame cold rolling mill for realizing plate shape detection of the plate and strip; the guide S roller is arranged between the axial variable tension roller and the coiler for isolating the tensile stress on the plate and strip; the running path of the plate and strip is provided with a guide roller for making the plate and strip fit tightly with the axial variable tension roller and the plate shape meter.

2. The closed-loop control system for plate shape during transverse tensile stress rolling of a plate strip according to claim 1, characterized in that: The multi-roller rolling mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to achieve plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

3. The closed-loop control system for plate shape during transverse tensile stress rolling of a plate strip according to claim 1, characterized in that: The multi-roller rolling mill is a single-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-stand cold rolling mill. The axial variable tension roller is arranged between the single-stand cold rolling mill and the coiler, and is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. One of the plate shape meters is arranged between the opener / coiler and the single-stand cold rolling mill, and the other plate shape meter is arranged between the axial variable tension roller and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the other plate shape meter, and is used to isolate the tensile stress on the plate and strip.

4. The closed-loop control system for plate shape during transverse tensile stress rolling of a plate strip according to claim 1, characterized in that: The multi-roller rolling mill is a single-frame cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the single-frame cold rolling mill. The axial variable tension rollers are respectively provided on the left and right sides of the single-frame cold rolling mill, and are used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The two plate shape meters are respectively provided between the opener / coiler and the axial variable tension roller on the left side of the single-frame cold rolling mill, and between the coiler and the axial variable tension roller on the right side of the single-frame cold rolling mill, and are used to realize plate shape detection of the plate and strip. The guide S rollers are respectively provided between the axial variable tension roller on the left side of the single-frame cold rolling mill and the plate shape meter, and between the axial variable tension roller on the right side of the single-frame cold rolling mill and the plate shape meter, and are used to isolate the tensile stress on the plate and strip.

5. The closed-loop control system for plate shape during transverse tensile stress rolling of a plate strip according to claim 1, characterized in that: The multi-roller rolling mill is a multi-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the multi-stand cold rolling mill. The right side of the i-th cold rolling mill in the multi-stand cold rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller of the last stand and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

6. The closed-loop control system for plate shape during transverse tensile stress rolling of a plate strip according to claim 1, characterized in that: The multi-roller rolling mill is a multi-stand cold rolling mill and an opener / coiler and a coiler are respectively provided on the left and right sides of the multi-stand cold rolling mill. The right side of the i-th cold rolling mill in the multi-stand cold rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. One plate shape meter is arranged between the first cold rolling mill and the opener / coiler, and the other plate shape meter is arranged between the last stand axial variable tension roller and the coiler, which is used to realize plate shape detection of the plate and strip.

7. The closed-loop control system for plate shape during transverse tensile stress rolling of a plate strip according to claim 1, characterized in that: The multi-roller rolling mill is a multi-stand hot rolling mill and a plate shape meter and a coiler are sequentially arranged at the outlet of the multi-stand hot rolling mill. The plate shape meter adopts a non-contact plate shape meter. The material at the inlet of the multi-stand hot rolling mill comes from the upstream hot rolling roughing mill. The right side of the i-th hot rolling mill in the multi-stand hot rolling mill is correspondingly provided with the i-th axial variable tension roller, which is used to realize plate shape control by regulating the distribution of local longitudinal tensile stress of the plate and strip. The plate shape meter is arranged between the axial variable tension roller of the last stand and the coiler, and is used to realize plate shape detection of the plate and strip. The guide S roller is arranged between the axial variable tension roller and the plate shape meter, and is used to isolate the tensile stress on the plate and strip.

8. A method for performing closed-loop control of plate shape using the plate shape closed-loop control system according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: Step 1: Use the shape meter to periodically sample and measure the longitudinal residual stress inside the plate and strip The distribution of the longitudinal residual stress is calculated and the difference between the target residual stress and the measured longitudinal residual stress is obtained as the plate shape control deviation; Step 2: Perform flatness pattern recognition and decompose the flatness control deviation into 1st-4th order and other higher order control components; Step 3: Calculate the plate shape control control quantity including the axial variable tension roller; adopt the influence matrix method or the plate shape control efficiency coefficient method, calculate the tilting roll, bending roll force, roll shape shifting, roll segment cooling, support roll segment adjustment, and transverse zone tensile stress control adjustment quantity vector according to the plate shape deviation discrete vector, and perform automatic control, among which the transverse zone tensile stress control is the axial variable tension roller, which is achieved by regulating the voltage or current of the solenoid valve or servo valve of the hydraulic or pneumatic system, thereby controlling the pressure in each channel of the bladder, and ultimately affecting the change of the local tensile stress of the plate and strip; Step 4: Repeat steps 1-3, cyclically sample the flatness value, calculate the flatness deviation, perform flatness pattern recognition, control the adjustment amount of the plate and strip, and realize flatness regulation.

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