Strip mill control method, apparatus, electronic device, and storage medium

Abstract

The application provides a strip rolling mill control method and device, electronic equipment and storage medium. The method comprises the following steps: obtaining a current rolling parameter group of a current stand and a current strip hardness distribution field and a current strip flatness distribution field at the exit of the current stand; performing roll gap deviation adjustment amount calculation on the current strip hardness distribution field and the current strip flatness distribution field respectively and the current rolling parameter group to obtain a current hardness corresponding roll gap deviation adjustment amount and a current flatness corresponding roll gap deviation adjustment amount; determining a target roll gap deviation adjustment amount according to the current hardness corresponding roll gap deviation adjustment amount and the current flatness corresponding roll gap deviation adjustment amount; and controlling the roll gap of the current stand according to the target roll gap deviation adjustment amount. The application realizes multi-factor and multi-dimensional control of hardness and flatness, effectively reduces the number of manual interventions, realizes unmanned and few-man stable production, greatly improves the production automation rate, and is suitable for multi-stand continuous rolling mills and single-stand rolling mills.

Description

Technical Field

[0001] This application relates to the field of rolling mill control technology, specifically to a strip rolling mill control method, device, electronic equipment, and storage medium. Background Technology

[0002] In the process of building intelligent manufacturing for strip steel, the stability of rolling and the quality of the strip shape are core quality indicators. Their precision not only profoundly affects the overall performance and application efficiency of the product, but also directly relates to the downstream industries' strict adherence to finished product quality standards. From automobile manufacturing to precision machinery, from home appliance production to electronic component packaging, all industries have put forward stringent requirements for the quality of strip steel or sheet materials.

[0003] Therefore, controlling rolling stability and strip shape quality has become an indispensable technical key in modern steel rolling production. However, in the actual production environment, the factors affecting strip shape quality are complex and diverse, such as changes in hardness and fluctuations in straightness. The traditional method of manually adjusting the roll gap deviation to correct the asymmetry on both sides of the rolling mill and the deviation of the rolled piece is unable to cope with these complex, ever-changing, and rapidly changing factors, resulting in poor strip shape control accuracy. In particular, the frequent manual adjustments during the threading stage and the tail-end drop during the steel throwing stage seriously affect production stability. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, this application provides a strip mill control method, device, electronic equipment and storage medium to solve the technical problem that the traditional method of manually adjusting the roll gap deviation to adjust the asymmetry on both sides of the mill and the deviation of the rolled piece cannot cope with complex changing factors such as hardness changes and flatness fluctuations, resulting in poor strip shape control accuracy.

[0005] This application provides a strip mill control method, the method comprising: acquiring the current rolling parameter set of the current stand and the current strip hardness field and the current strip flatness field at the exit of the current stand, wherein the current rolling parameter set includes at least the workpiece thickness at the entrance of the current stand and the workpiece thickness at the exit of the current stand; calculating the roll gap deviation adjustment amount by comparing the current strip hardness field and the current strip flatness field with the current rolling parameter set, respectively, to obtain the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness; determining the target roll gap deviation adjustment amount for the current stand based on the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness, so as to control the roll gap of the current stand according to the target roll gap deviation adjustment amount.

[0006] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip hardness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current hardness. This includes: obtaining the current strip centerline deviation at the current stand exit, and performing proportional-integral adjustment based on the current strip centerline deviation using a centerline-corresponding proportional-integral regulator to obtain the current centerline deviation adjustment amount; dividing the current strip hardness field into an operating side hardness field and a transmission side hardness field according to the rolling centerline, obtaining the operating side comprehensive hardness based on the operating side hardness field, and obtaining the transmission side comprehensive hardness based on the transmission side hardness field; performing proportional-integral adjustment based on the current centerline deviation adjustment amount, the operating side comprehensive hardness, and the transmission side comprehensive hardness using a hardness-corresponding proportional-integral regulator to obtain the current hardness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current hardness based on the current hardness deviation adjustment amount and the current rolling parameter set.

[0007] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness. This includes: obtaining the current strip centerline deviation at the current stand exit, and performing proportional-integral adjustment based on the current strip centerline deviation using a centerline-corresponding proportional-integral regulator to obtain the current centerline deviation adjustment amount; dividing the current strip flatness field into an operating side flatness field and a transmission side flatness field according to the rolling centerline, obtaining the operating side comprehensive flatness based on the operating side flatness field, and obtaining the transmission side comprehensive flatness based on the transmission side flatness field; performing proportional-integral adjustment based on the current centerline deviation adjustment amount, the operating side comprehensive flatness, and the transmission side comprehensive flatness using a flatness-corresponding proportional-integral regulator to obtain the current flatness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current flatness based on the current flatness deviation adjustment amount and the current rolling parameter set.

[0008] In one embodiment of this application, before determining the target roll gap deviation adjustment amount for the current stand, the method further includes: obtaining the current strip centerline deviation at the exit of the current stand; calculating the roll gap deviation adjustment amount by comparing the current strip centerline deviation with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current centerline, so as to determine the target roll gap deviation adjustment amount based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap deviation adjustment amount corresponding to the current flatness, and the roll gap deviation adjustment amount corresponding to the current centerline. In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip hardness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current hardness. This includes: dividing the current strip hardness field into an operating side hardness field and a transmission side hardness field according to the rolling centerline; obtaining the operating side comprehensive hardness based on the operating side hardness field; obtaining the transmission side comprehensive hardness based on the transmission side hardness field; performing proportional-integral adjustment based on the operating side comprehensive hardness and the transmission side comprehensive hardness using a hardness-corresponding proportional-integral regulator to obtain the current hardness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current hardness based on the current hardness deviation adjustment amount and the current rolling parameter set.

[0009] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness. This includes: dividing the current strip flatness field into an operating side flatness field and a transmission side flatness field according to the rolling centerline; obtaining the operating side comprehensive flatness based on the operating side flatness field; obtaining the transmission side comprehensive flatness based on the transmission side flatness field; performing proportional-integral adjustment based on the operating side comprehensive flatness and the transmission side comprehensive flatness using a flatness-corresponding proportional-integral regulator to obtain the current flatness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current flatness based on the current flatness deviation adjustment amount and the current rolling parameter set.

[0010] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip centerline deviation with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current centerline. This includes: performing proportional-integral adjustment based on the current strip centerline deviation using a centerline-corresponding proportional-integral regulator to obtain the current centerline deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current centerline based on the current centerline deviation adjustment amount and the current rolling parameter set.

[0011] In one embodiment of this application, determining the roll gap deviation adjustment amount corresponding to the current hardness based on the current hardness deviation adjustment amount and the current rolling parameter set includes: generating a current first variable parameter set based on the current hardness deviation adjustment amount and the current rolling parameter set, wherein the current rolling parameter set also includes the workpiece width, mill stiffness, and workpiece plasticity coefficient at the current stand; calculating the current first roll gap deviation adjustment amount according to a first preset relationship and the current first variable parameter set, wherein the first preset relationship characterizes the correspondence between the roll gap deviation adjustment amount and the first variable parameter set; reading the hardness-corresponding adjustment coefficient, and calculating the current hardness-corresponding roll gap deviation adjustment amount according to the hardness-corresponding adjustment coefficient and the current first roll gap deviation adjustment amount.

[0012] In one embodiment of this application, obtaining the overall hardness of the operating side based on the operating side hardness field and obtaining the overall hardness of the transmission side based on the transmission side hardness field includes: performing a weighted calculation on the hardness at different positions on the operating side and the hardness weight coefficient at each position on the operating side to obtain a weighted hardness of the operating side, which is used as the overall hardness of the operating side. The operating side hardness field includes the hardness at different positions on the operating side, and the hardness weight coefficient at each position on the operating side is determined based on the distance between the position and the rolling center line; performing a weighted calculation on the hardness at different positions on the transmission side and the hardness weight coefficient at each position on the transmission side to obtain a weighted hardness of the transmission side, which is used as the overall hardness of the transmission side. The transmission side hardness field includes the hardness at different positions on the transmission side, and the hardness weight coefficient at each position on the transmission side is determined based on the distance between the position and the rolling center line.

[0013] In one embodiment of this application, determining the roll gap deviation adjustment amount corresponding to the current flatness based on the current flatness deviation adjustment amount and the current rolling parameter set includes: generating a current second variable parameter set based on the current flatness deviation adjustment amount and the current rolling parameter set, wherein the current rolling parameter set also includes the workpiece width, mill stiffness, and workpiece plasticity coefficient at the current stand; calculating the current second roll gap deviation adjustment amount according to a second preset relationship and the current second variable parameter set, wherein the second preset relationship characterizes the correspondence between the roll gap deviation adjustment amount and the second variable parameter set; reading the flatness corresponding adjustment coefficient, and calculating the current flatness corresponding roll gap deviation adjustment amount according to the flatness corresponding adjustment coefficient and the current second roll gap deviation adjustment amount.

[0014] In one embodiment of this application, obtaining the overall flatness of the operating side based on the flatness field of the operating side and obtaining the overall flatness of the transmission side based on the flatness field of the transmission side includes: performing a weighted calculation on the flatness of different positions on the operating side and the flatness weight coefficient of each position on the operating side to obtain a weighted flatness of the operating side, which is used as the overall flatness of the operating side. The flatness field of the operating side includes the flatness of different positions on the operating side, and the flatness weight coefficient of each position on the operating side is determined based on the distance between the position and the rolling center line; performing a weighted calculation on the flatness of different positions on the transmission side and the flatness weight coefficient of each position on the transmission side to obtain a weighted flatness of the transmission side, which is used as the overall flatness of the transmission side. The flatness field of the transmission side includes the flatness of different positions on the transmission side, and the flatness weight coefficient of each position on the transmission side is determined based on the distance between the position and the rolling center line.

[0015] In one embodiment of this application, determining the roll gap deviation adjustment amount corresponding to the current centerline based on the current centerline deviation adjustment amount and the current rolling parameter set includes: generating a current third variable parameter set based on the current centerline deviation adjustment amount and the current rolling parameter set, wherein the current rolling parameter set also includes the workpiece width, mill stiffness, and workpiece plasticity coefficient at the current stand; calculating the current third roll gap deviation adjustment amount based on a third preset relationship and the current third variable parameter set, wherein the third preset relationship characterizes the correspondence between the roll gap deviation adjustment amount and the third variable parameter set; reading the centerline-corresponding adjustment coefficient, and calculating the current centerline-corresponding roll gap deviation adjustment amount based on the centerline-corresponding adjustment coefficient and the current third roll gap deviation adjustment amount.

[0016] In one embodiment of this application, determining the target roll gap deviation adjustment amount based on the current hardness-corresponding roll gap deviation adjustment amount, the current flatness-corresponding roll gap deviation adjustment amount, and the current centerline-corresponding roll gap deviation adjustment amount includes: determining the target process stage of the current stand according to its position in the rolling mill, and reading the control weight coefficient of the target process stage, wherein the target process stage is one of the strip threading stage, rolling stage, and steel removal stage, and the control weight coefficient of the target process stage includes the hardness-corresponding roll gap adjustment weight coefficient, the flatness-corresponding roll gap adjustment weight coefficient, and the centerline-corresponding roll gap adjustment weight coefficient; and performing a weighted calculation based on the current hardness-corresponding roll gap deviation adjustment amount, the hardness-corresponding roll gap adjustment weight coefficient, the current flatness-corresponding roll gap deviation adjustment amount, the flatness-corresponding roll gap adjustment weight coefficient, the current centerline-corresponding roll gap deviation adjustment amount, and the centerline-corresponding roll gap adjustment weight coefficient to obtain the target roll gap deviation adjustment amount.

[0017] In one embodiment of this application, determining the target roll gap deviation adjustment amount based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap deviation adjustment amount corresponding to the current flatness, and the roll gap deviation adjustment amount corresponding to the current centerline includes: obtaining the upstream feedforward roll gap deviation adjustment amount, which is obtained based on the current rolling parameter set, the upstream hardness deviation adjustment amount of the upstream stand, the upstream flatness deviation adjustment amount, and the upstream centerline deviation adjustment amount; determining the target process stage of the current stand according to its position in the rolling mill, and reading the control weight coefficient of the target process stage, wherein the target process stage is one of the following: the strip threading stage, the rolling stage, and the steel removal stage. One of the control weight coefficients for the target process stage includes the feedforward corresponding roll gap adjustment weight coefficient, the hardness corresponding roll gap adjustment weight coefficient, the straightness corresponding roll gap adjustment weight coefficient, and the centerline corresponding roll gap adjustment weight coefficient. The target roll gap deviation adjustment amount is obtained by weighting the upstream feedforward roll gap deviation adjustment amount and the feedforward corresponding roll gap adjustment weight coefficient, the current hardness corresponding roll gap deviation adjustment amount and the hardness corresponding roll gap adjustment weight coefficient, the current straightness corresponding roll gap deviation adjustment amount and the straightness corresponding roll gap adjustment weight coefficient, and the current centerline corresponding roll gap deviation adjustment amount and the centerline corresponding roll gap adjustment weight coefficient.

[0018] In one embodiment of this application, controlling the roll gap of the current frame according to the target roll gap deviation adjustment amount includes: obtaining the conventional roll gap deviation adjustment amount of the current frame; determining the final roll gap deviation adjustment amount of the current frame based on the conventional roll gap deviation adjustment amount and the target roll gap deviation adjustment amount, so as to control the roll gap of the current frame according to the final roll gap deviation adjustment amount.

[0019] In one embodiment of this application, a strip mill control device is also provided. The device includes: a data acquisition module, used to acquire the current rolling parameter set of the current stand and the current strip hardness field and current strip flatness field at the exit of the current stand, wherein the current rolling parameter set includes at least the workpiece thickness at the entrance of the current stand and the workpiece thickness at the exit of the current stand; an information processing module, used to calculate the roll gap deviation adjustment amount by comparing the current strip hardness field and the current strip flatness field with the current rolling parameter set, respectively, to obtain the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness, and to determine the target roll gap deviation adjustment amount for the current stand based on the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness; and an execution module, used to control the roll gap of the current stand through control commands, wherein the control commands are generated based on the target roll gap deviation adjustment amount.

[0020] In one embodiment of this application, an electronic device is also provided, the electronic device comprising: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the strip mill control method as described above.

[0021] In one embodiment of this application, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a computer processor, causes the computer to perform the strip mill control method as described above.

[0022] The beneficial effects of this invention are as follows: This invention provides a strip mill control method, device, electronic equipment, and storage medium. The method calculates the roll gap deviation adjustment amount by comparing the current strip hardness field and the current strip straightness field with the current rolling parameter set, obtaining the roll gap deviation adjustment amount corresponding to the current hardness and the current straightness. Based on these adjustment amounts, the target roll gap deviation adjustment amount for the current stand is determined. The roll gap of the current stand is then controlled according to the target adjustment amount. By combining the influence of strip hardness and straightness on strip shape quality, the target roll gap deviation adjustment amount is comprehensively determined to control the roll gap of the current stand. This achieves multi-factor, multi-dimensional, and refined control of the strip rolling process, replacing manual operation, effectively reducing the number of manual interventions, and significantly improving the production automation rate. It enables stable unmanned or minimally manned production, not only reducing manual labor load but also improving various comprehensive quality indicators, thereby enhancing rolling effect and strip shape quality. It is also widely applicable, suitable for both multi-stand rolling mills and single-stand rolling mills.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the implementation environment of a strip mill control method according to an exemplary embodiment of this application;

[0025] Figure 2 This is a flowchart illustrating an exemplary embodiment of a strip mill control method according to this application;

[0026] Figure 3 This is a schematic diagram of the measured spectral line distribution shown in a specific embodiment of this application;

[0027] Figure 4 This is a schematic diagram of Fi rack temperature field measurement shown in a specific embodiment of this application;

[0028] Figure 5This is a block diagram illustrating a strip mill control device according to an exemplary embodiment of this application;

[0029] Figure 6 This is a flowchart illustrating the operation of a composite measurement and control system according to a specific embodiment of this application;

[0030] Figure 7 yes Figure 6 The calculation flowchart of the LCM model of the Fi rack in the specific embodiment shown is shown in one specific embodiment;

[0031] Figure 8 yes Figure 7 The calculation flowchart of the LCM1 model in a specific embodiment is shown below.

[0032] Figure 9 yes Figure 7 The calculation flowchart of the LCM2 model in a specific embodiment is shown below;

[0033] Figure 10 yes Figure 7 The calculation flowchart of the LCM4 model in a specific embodiment is shown below.

[0034] Figure 11 This is a flowchart illustrating the operation of a dual closed-loop control system according to another specific embodiment of this application;

[0035] Figure 12 This is a schematic diagram illustrating the structure of an electronic device as shown in an exemplary embodiment of this application. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] It should be noted that in this application, terms such as "first" and "second" are merely for distinguishing similar objects, and do not limit the order or sequence of similar objects. The variations of "including" and "having" indicate that the scope covered by the subject of the word is not exclusive, except for the examples shown by the word.

[0039] It is understood that the various numerical designations, step numbers, and other identifiers recorded in this application are for descriptive convenience and are not intended to limit the scope of this application. The size of the identifiers in this application does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

[0040] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0041] It should be noted that plate and strip usually refer to medium plate or strip steel, and rolled products are the raw materials of plate and strip steel. In other words, after the rolled products are rolled by a rolling mill, the resulting product is medium plate or strip steel.

[0042] The embodiments of this application respectively propose a strip mill control method, a strip mill control device, an electronic device, a computer-readable storage medium, and a computer program product, which will be described in detail below.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating the implementation environment of a strip mill control method according to an exemplary embodiment of this application.

[0044] like Figure 1As shown, the implementation environment may include a data acquisition device 110, a computer device 120, and a roll gap control device 130. The data acquisition device 110 includes at least a temperature field sensor, a flatness measuring instrument, and a thickness gauge. The temperature field sensor may be at least one of an infrared thermal imager, a temperature recorder, etc., without limitation. The computer device 120 may be at least one of a microcomputer, an embedded computer, a neural network computer, etc. The computer device 120 may be configured in an L1 (basic automation system or equipment control system) system or an L2 (process control system) system, or it may be a stand-alone computer device, without limitation. The roll gap control device 130 includes an AGC (Automatic Gauge Control) system and / or an HGC (Hydraulic Gap Control) system. The data acquisition device 110 can be used to acquire the current rolling parameter set of the current stand, as well as the current strip hardness field and current strip flatness field at the current stand exit, and provide them to the computer device 120 for processing. The computer device 120 can be used to automatically process the current rolling parameter group, the current strip hardness field, and the current strip straightness field to determine the target roll gap deviation adjustment amount for the current stand, so that the roll gap control device 130 controls the roll gap of the current stand according to the target roll gap deviation adjustment amount.

[0045] Indicatively, the current rolling parameter set of the current stand, as well as the current strip hardness field and current strip straightness field at the exit of the current stand, are obtained. The current rolling parameter set includes at least the workpiece thickness at the entrance and exit of the current stand. The current strip hardness field and current strip straightness field are then compared with the current rolling parameter set to calculate the roll gap deviation adjustment amount, obtaining the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current straightness. Based on the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current straightness, the target roll gap deviation adjustment amount for the current stand is determined, and the roll gap of the current stand is controlled according to the target roll gap deviation adjustment amount. As can be seen, the technical solution of this application comprehensively determines the target roll gap deviation adjustment amount by combining the influence of strip hardness and flatness on strip shape quality, thereby controlling the roll gap of the current stand. This achieves multi-factor, multi-dimensional, and refined control of the strip rolling process, replacing manual operation and contributing to the promotion of fully automated and intelligent production lines. It reduces manual supervision and intervention, lowers labor load, improves production stability, achieves highly automated production, enhances various comprehensive quality indicators, and ultimately improves rolling effect and strip shape quality. Furthermore, the technical solution of this application has a wide range of applications, suitable for both multi-stand continuous rolling mills and single-stand rolling mills.

[0046] It should be noted that the strip mill control method provided in this application embodiment can be specifically executed by computer equipment 120, and correspondingly, the strip mill control device can be set in computer equipment 120.

[0047] Please see Figure 2 , Figure 2 This is a flowchart illustrating an exemplary embodiment of a strip mill control method. This strip mill control method can be applied to... Figure 1 The implementation environment shown is specifically executed by computer equipment 120 within that implementation environment. It should be understood that this strip mill control method can also be applied to other exemplary implementation environments and executed by equipment in other implementation environments; this embodiment does not limit the implementation environment to which the strip mill control method is applicable. Figure 2 As shown, in an exemplary embodiment, the strip mill control method includes at least steps S210 to S230, which are described in detail below:

[0048] Step S210: Obtain the current rolling parameter set of the current stand, as well as the current strip hardness field and the current strip flatness field at the exit of the current stand.

[0049] In one embodiment of this application, the current rolling parameter set includes at least the piece thickness at the current stand entrance and the piece thickness at the current stand exit. Furthermore, the current rolling parameter set may also include at least one of the following: piece width at the current mill, mill stiffness, and piece plasticity coefficient. The piece width refers to the piece width at the current stand exit; the mill stiffness refers to the stiffness of both sides of the current stand (operating side and drive side); and the piece plasticity coefficient typically refers to the change in rolling force resulting from a unit change in piece thickness, which can be determined by the change in rolling force and the change in piece thickness. The strip hardness field refers to the hardness distribution (also called hardness distribution field) at different positions along the strip width direction at the stand exit position. The strip straightness field refers to the straightness distribution (also called straightness distribution field) at different positions along the strip width direction at the stand exit position. The strip mill can be a multi-stand continuous mill or a single-stand mill. A measurement system can be deployed near the strip mill. This system should include at least a flatness measuring instrument, a temperature field sensor, and a thickness gauge. It may also include image acquisition devices such as cameras or webcams. The measurement range of the system needs to cover the entire length of the roll body. Please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic diagram of the measured spectral line distribution shown in a specific embodiment of this application. For example... Figure 3As shown, the cylinder represents the roll, the red represents the strip, and the blue represents the measurement spectral lines of the measurement system. The measurement spectral lines refer to the measurement lines of the hardness field and the straightness field. Each spectral line represents a position in the width direction and is used to measure the hardness and straightness at different locations to obtain the hardness field and straightness field. The measurement spectral lines are distributed along the width direction of the strip and cover the entire length of the roll body. The spacing between the measurement spectral lines can be less than or equal to 1 cm. The denser the measurement spectral lines, the higher the accuracy of the final roll gap deviation adjustment. Of course, denser measurement spectral lines also require higher measurement and calculation speeds.

[0050] For the thickness of the rolled piece, a thickness gauge can be used to collect the thickness of the rolled piece at the current stand entrance and the current stand exit, and then added to the current rolling parameter set. For the flatness field, a flatness measuring instrument can be used to collect the length of each measurement spectrum line at the stand exit, forming the flatness field of the strip at the stand exit. For the hardness field, a temperature field sensor can be used to collect the temperature of each measurement spectrum line at the stand exit, forming the temperature field of the strip at the stand exit, and the hardness field can be obtained based on the temperature field. Illustratively, the temperature field (also called temperature distribution or temperature distribution field) can be converted into a hardness field based on the correspondence between hardness and temperature; this correspondence can be obtained experimentally beforehand. Alternatively, at least one of the following parameters can be obtained: steel grade, plasticity coefficient, deformation resistance, rolling speed, rolling tension, etc., and the hardness field of the strip at the stand exit can be calculated based on these parameters and the temperature field of the strip at the stand exit.

[0051] In one specific embodiment of this application, the hardness of a metallic material at high temperature reflects the stress it bears when deforming. During the strip rolling process, the hardness field of the strip is related to the temperature field, rolling speed, rolling tension, steel grade, plasticity coefficient, and deformation resistance. Therefore, to improve the accuracy of the hardness field, it can be calculated in the following way:

[0052] H w =f(T) w Equation (1)

[0053] Among them, H w T represents the hardness field along the width of the strip. w Let v be the temperature field along the width of the strip, v be the rolling speed, t be the rolling tension, g be the steel grade, K be the plasticity coefficient, r be the deformation resistance, and f(T) be the temperature field along the width of the strip. w ,v,t,g,K,r) is based on T w The functional relationship between v, t, g, K, and r as independent variables can be obtained in advance through experiments or by looking up tables.

[0054] Please see Figure 4 , Figure 4This is a schematic diagram illustrating the temperature field measurement of a Fi rack, as shown in a specific embodiment of this application. Figure 4 As shown, the temperature field can be measured using a surface scanning method, such as Method 2. The surface scanning distance d along the strip length direction should not exceed the distance the strip advances during the AGC scanning cycle. The average value or other filtered value is used as the measured value. If the measurement system's processing speed cannot meet the real-time requirements, a line scanning method can also be used, such as Method 1. It should be noted that the surface scanning distance along the strip length direction should not be too long, generally set to 1 cm. A surface scanning distance that is too wide, such as greater than 1 cm or 1.5 cm, can easily lead to too coarse granularity, failing to accurately reflect the actual temperature value, and is also detrimental to feedforward control.

[0055] Step S220: Calculate the roll gap deviation adjustment amount by comparing the current strip hardness field and the current strip flatness field with the current rolling parameter group, and obtain the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness.

[0056] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip hardness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current hardness. The roll gap deviation adjustment amount is also calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness. The calculation of each roll gap deviation adjustment amount can be performed simultaneously or sequentially, and there is no restriction here.

[0057] To determine the roll gap deviation adjustment amount corresponding to the current hardness, a functional relationship between hardness, inlet / outlet thickness (the thickness of the rolled piece at the stand exit and the thickness of the rolled piece at the stand entrance) and roll gap deviation adjustment amount can be pre-fitted experimentally as the first functional relationship. Then, a hardness value is determined based on the hardness field, for example, by calculating the average hardness or weighted average hardness based on the hardness of each measured spectrum line. Based on the calculated hardness value, the thickness of the rolled piece at the current stand entrance / outlet, and the pre-determined first functional relationship, the roll gap deviation adjustment amount corresponding to the current hardness is determined. Similarly, to determine the roll gap deviation adjustment amount corresponding to the current flatness, a functional relationship between flatness, inlet / outlet thickness, and roll gap deviation adjustment amount can be pre-fitted experimentally as the second functional relationship. Then, a flatness value is determined based on the flatness field, for example, by calculating the average flatness or weighted average flatness based on the flatness of each measured spectrum line. Based on the calculated flatness value, the thickness of the rolled piece at the current stand entrance / outlet, and the pre-determined second functional relationship, the roll gap deviation adjustment amount corresponding to the current flatness is determined.

[0058] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip hardness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current hardness. This includes: dividing the current strip hardness field into an operating side hardness field and a transmission side hardness field according to the rolling centerline; obtaining the operating side comprehensive hardness based on the operating side hardness field and the transmission side comprehensive hardness based on the transmission side hardness field; performing proportional-integral adjustment based on the operating side comprehensive hardness and the transmission side comprehensive hardness using a hardness-corresponding proportional-integral regulator to obtain the current hardness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current hardness based on the current hardness deviation adjustment amount and the current rolling parameter set.

[0059] In this embodiment, the rolls are typically divided into OS (Operating Side) and DS (Driving Side) along the rolling centerline. The operating side is the side where the roll changing and operating table are located, while the driving side is the side where the drive motor and drive shaft are located. Therefore, the current strip hardness field can be divided according to the pre-set rolling centerline to obtain the operating side hardness field and the driving side hardness field. The operating side hardness field includes the hardness of the strip at different positions on the operating side. Since only one adjustment amount can be output to the single-sided AGC cylinder, the average hardness or weighted average hardness of the strip at different positions on the operating side can be calculated as the comprehensive hardness of the operating side. The driving side hardness field includes the hardness of the strip at different positions on the driving side. The average hardness or weighted average hardness of the strip at different positions on the driving side can be calculated as the comprehensive hardness of the driving side. Then, using the combined hardness of the operating side and the combined hardness of the transmission side as inputs, the PI (Proportional Integral) regulator corresponding to the hardness is used to perform proportional-integral adjustment based on the difference between the combined hardness of the operating side and the combined hardness of the transmission side, and the output is obtained as the current hardness deviation adjustment amount. Based on the current hardness deviation adjustment amount and the current rolling parameter set, the roll gap deviation adjustment amount corresponding to the current hardness is determined.

[0060] This embodiment subdivides the strip hardness field into an operating side hardness field and a transmission side hardness field, which allows for a more precise understanding of the hardness of each side. By using a proportional-integral regulator to determine the hardness deviation adjustment amount based on the overall hardness difference between the operating side and the transmission side, the accuracy of subsequent roll gap adjustment is improved, thereby reducing hardness deviation and ensuring the uniformity and consistency of overall hardness. This improves both the dimensional accuracy and surface quality of the product.

[0061] In another embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip hardness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current hardness. This includes: obtaining the current strip centerline deviation at the current stand exit, and performing proportional-integral adjustment based on the current strip centerline deviation using a centerline-corresponding proportional-integral regulator to obtain the current centerline deviation adjustment amount; dividing the current strip hardness field into an operating side hardness field and a transmission side hardness field according to the rolling centerline, obtaining the operating side comprehensive hardness based on the operating side hardness field, and obtaining the transmission side comprehensive hardness based on the transmission side hardness field; performing proportional-integral adjustment based on the current centerline deviation adjustment amount, the operating side comprehensive hardness, and the transmission side comprehensive hardness using a hardness-corresponding proportional-integral regulator to obtain the current hardness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current hardness based on the current hardness deviation adjustment amount and the current rolling parameter set.

[0062] In this embodiment, the strip centerline deviation refers to the offset between the centerline of the strip on the stand exit side in the strip width direction and the rolling centerline (the predetermined centerline of the roll). The centerline deviation can be determined by temperature field data collected by a temperature field sensor or image data collected by an image acquisition device. The strip edge can be detected by judging the rate of temperature change or the rate of change in image chromaticity and brightness from the outside towards the centerline, thereby determining the strip centerline position. The strip centerline deviation is then determined based on the strip centerline position and the rolling centerline position. Since the strip centerline deviation affects the division of the hardness field between the operating side and the drive side, it has a certain impact on the determination of the hardness deviation adjustment amount. Therefore, a PI controller corresponding to the centerline can be used to perform proportional-integral adjustment based on the strip centerline deviation to obtain the current centerline deviation adjustment amount. A PI controller corresponding to the hardness can then be used to perform proportional-integral adjustment based on the difference between the comprehensive hardness on the operating side and the comprehensive hardness on the drive side, along with the current centerline deviation adjustment amount, to obtain the current hardness deviation adjustment amount. This effectively improves the accuracy of the hardness deviation adjustment amount, thereby improving the accuracy of the roll gap deviation adjustment amount corresponding to the hardness.

[0063] In one embodiment of this application, obtaining the overall hardness of the operating side based on the operating side hardness field and obtaining the overall hardness of the transmission side based on the transmission side hardness field includes: performing a weighted calculation on the hardness at different positions on the operating side and the hardness weight coefficient at each position on the operating side to obtain the weighted hardness of the operating side, which is used as the overall hardness of the operating side. The operating side hardness field includes the hardness at different positions on the operating side, and the hardness weight coefficient at each position on the operating side is determined based on the distance between the position and the rolling center line; performing a weighted calculation on the hardness at different positions on the transmission side and the hardness weight coefficient at each position on the transmission side to obtain the weighted hardness of the transmission side, which is used as the overall hardness of the transmission side. The transmission side hardness field includes the hardness at different positions on the transmission side, and the hardness weight coefficient at each position on the transmission side is determined based on the distance between the position and the rolling center line.

[0064] In this embodiment, each position refers to the location of each measured spectral line. A hardness weighting coefficient for each measured spectral line location can be preset; the farther the measured spectral line location is from the rolling center, the larger its hardness weighting coefficient. Then, the weighted hardness on the operating side and the weighted hardness on the transmission side are calculated separately. For the operating side weighted hardness, the hardness at each position on the operating side is multiplied by the hardness weighting coefficient at the same position, and the products are summed over each position on the operating side to obtain the operating side weighted hardness, which is used as the overall operating side hardness. For the transmission side weighted hardness, the hardness at each position on the transmission side is multiplied by the hardness weighting coefficient at the same position, and the products are summed over each position on the transmission side to obtain the transmission side weighted hardness, which is used as the overall transmission side hardness.

[0065] This embodiment determines the hardness weighting coefficient of each position based on its distance from the rolling centerline, and performs weighted calculations accordingly. This improves the accuracy of the overall hardness, making the hardness assessment more consistent with the actual situation, thereby further improving the accuracy of subsequent roll gap deviation adjustment.

[0066] In one embodiment of this application, determining the roll gap deviation adjustment amount corresponding to the current hardness based on the current hardness deviation adjustment amount and the current rolling parameter set includes: generating a current first variable parameter set based on the current hardness deviation adjustment amount and the current rolling parameter set, wherein the current rolling parameter set also includes the workpiece width, mill stiffness, and workpiece plasticity coefficient at the current stand; calculating the current first roll gap deviation adjustment amount based on a first preset relationship and the current first variable parameter set, wherein the first preset relationship characterizes the correspondence between the roll gap deviation adjustment amount and the first variable parameter set; reading the hardness-corresponding adjustment coefficient, and calculating the current hardness-corresponding roll gap deviation adjustment amount based on the hardness-corresponding adjustment coefficient and the current first roll gap deviation adjustment amount.

[0067] In this embodiment, the current hardness deviation adjustment amount, the workpiece thickness at the current stand inlet, the workpiece thickness at the current stand outlet, the workpiece width at the current stand, the mill stiffness, and the workpiece plasticity coefficient can all be used as independent variable parameters. The current first roll gap deviation adjustment amount is calculated using a first preset relationship. Then, the hardness-corresponding adjustment coefficient is multiplied by the current first roll gap deviation adjustment amount to obtain the current hardness-corresponding roll gap deviation adjustment amount. The hardness-corresponding adjustment coefficient can be preset or manually determined through on-site rolling adjustments. It can be set to a value between 0 and 1. The calculation method for the current hardness-corresponding roll gap deviation adjustment amount is illustrated below:

[0068] ΔS H =KP H ×f(δ H H en H ex Equation (2) (W,M,K)

[0069] Where, ΔS H KP represents the adjustment amount for the roll gap deviation corresponding to the current hardness. H δ is the adjustment coefficient corresponding to hardness. H H represents the current hardness deviation adjustment amount. en H represents the thickness of the rolled piece at the current stand entrance. ex Where is the thickness of the rolled piece at the current stand exit, W is the width of the rolled piece at the current stand, M is the mill stiffness at the current stand, K is the plasticity coefficient of the rolled piece at the current stand, and f(δ) H H en H ex ,W,M,K) as δ H H en H ex The functional relationship between W, M, and K as independent variables is the first presupposed relationship.

[0070] The strip width (rolled strip width) and the strip centerline deviation can be determined by using a temperature field sensor or image acquisition equipment. The temperature change rate or the image color and brightness change rate can be judged from the outside towards the centerline to detect the strip edge, thereby determining the strip width.

[0071] This embodiment, while considering strip hardness and thickness as influencing factors for roll gap deviation adjustment, also considers workpiece width, mill rigidity, and workpiece plasticity coefficient as influencing factors for roll gap deviation adjustment. This can further improve the accuracy of roll gap deviation adjustment and better adapt to different rolling conditions, thereby improving the flexibility and adaptability of thickness control.

[0072] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness. This includes: dividing the current strip flatness field into an operating side flatness field and a transmission side flatness field according to the rolling centerline; obtaining the operating side comprehensive flatness based on the operating side flatness field and the transmission side comprehensive flatness based on the transmission side flatness field; performing proportional-integral adjustment based on the operating side comprehensive flatness and the transmission side comprehensive flatness using a flatness-corresponding proportional-integral regulator to obtain the current flatness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current flatness based on the current flatness deviation adjustment amount and the current rolling parameter set.

[0073] In this embodiment, similar to the division of the hardness field, the current strip straightness field is divided according to the rolling centerline to obtain the operating side straightness field and the drive side straightness field. The operating side straightness field includes the straightness of the strip at different positions on the operating side. The average straightness or weighted average straightness of the strip at different positions on the operating side can be calculated as the comprehensive straightness of the operating side. The drive side straightness field includes the straightness of the strip at different positions on the drive side. The average straightness or weighted average straightness of the strip at different positions on the drive side can be calculated as the comprehensive straightness of the drive side. Then, using the comprehensive straightness of the operating side and the comprehensive straightness of the drive side as inputs, the PI controller corresponding to the straightness is used for proportional-integral adjustment to obtain the output, which is used as the current straightness deviation adjustment amount. Based on the current straightness deviation adjustment amount and the current rolling parameter set, the roll gap deviation adjustment amount corresponding to the current straightness is determined.

[0074] This embodiment subdivides the flatness field of the strip into an operating side flatness field and a transmission side flatness field, which allows for a more precise understanding of the flatness of each side. By using a proportional-integral regulator to determine the flatness deviation adjustment amount based on the overall flatness difference between the operating side and the transmission side, the accuracy of subsequent roll gap adjustment is improved, thereby reducing flatness deviation and ensuring the uniformity and consistency of overall flatness. This improves both the dimensional accuracy and surface quality of the product.

[0075] In another embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness. This includes: obtaining the current strip centerline deviation at the current stand exit, and performing proportional-integral adjustment based on the current strip centerline deviation using a centerline-corresponding proportional-integral regulator to obtain the current centerline deviation adjustment amount; dividing the current strip flatness field into an operating side flatness field and a transmission side flatness field according to the rolling centerline, obtaining the operating side comprehensive flatness based on the operating side flatness field, and obtaining the transmission side comprehensive flatness based on the transmission side flatness field; performing proportional-integral adjustment based on the current centerline deviation adjustment amount, the operating side comprehensive flatness, and the transmission side comprehensive flatness using a flatness-corresponding proportional-integral regulator to obtain the current flatness deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current flatness based on the current flatness deviation adjustment amount and the current rolling parameter set.

[0076] In this embodiment, since the deviation of the strip centerline affects the division of the flatness field between the operating side and the transmission side, it will have a certain impact on the determination of the flatness deviation adjustment amount. Therefore, the PI regulator corresponding to the flatness can be used to perform proportional-integral adjustment based on the difference between the comprehensive flatness of the operating side and the comprehensive flatness of the transmission side, and the current centerline deviation adjustment amount, to obtain the current flatness deviation adjustment amount. This can effectively improve the accuracy of the flatness deviation adjustment amount, and thus improve the accuracy of the roll gap deviation adjustment amount corresponding to the flatness.

[0077] In one embodiment of this application, the overall flatness of the operating side is obtained based on the flatness field of the operating side, and the overall flatness of the transmission side is obtained based on the flatness field of the transmission side. This includes: performing a weighted calculation on the flatness at different positions on the operating side and the flatness weight coefficient at each position on the operating side to obtain a weighted flatness of the operating side, which is used as the overall flatness of the operating side. The flatness field of the operating side includes the flatness at different positions on the operating side, and the flatness weight coefficient at each position on the operating side is determined based on the distance between the position and the rolling center line; performing a weighted calculation on the flatness at different positions on the transmission side and the flatness weight coefficient at each position on the transmission side to obtain a weighted flatness of the transmission side, which is used as the overall flatness of the transmission side. The flatness field of the transmission side includes the flatness at different positions on the transmission side, and the flatness weight coefficient at each position on the transmission side is determined based on the distance between the position and the rolling center line.

[0078] In this embodiment, as in the previous embodiment, each position refers to the location of each measured spectral line. Therefore, a flatness weighting coefficient for each measured spectral line location can be preset, with the flatness weighting coefficient being larger the farther the measured spectral line location is from the rolling center. Then, the weighted flatness on the operating side and the weighted flatness on the transmission side are calculated separately. For the weighted flatness on the operating side, the flatness of each position on the operating side is multiplied by the flatness weighting coefficient of the same position, and the products of each position on the operating side are summed to obtain the weighted flatness on the operating side, which is used as the comprehensive flatness on the operating side. For the weighted flatness on the transmission side, the flatness of each position on the transmission side is multiplied by the flatness weighting coefficient of the same position, and the products of each position on the transmission side are summed to obtain the weighted flatness on the transmission side, which is used as the comprehensive flatness on the transmission side.

[0079] This embodiment determines the flatness weighting coefficient of each position based on its distance from the rolling center line, and performs weighted calculations accordingly. This improves the accuracy of the overall flatness, making the flatness assessment more consistent with the actual situation, thereby further improving the accuracy of subsequent roll gap deviation adjustment.

[0080] In one embodiment of this application, determining the roll gap deviation adjustment amount corresponding to the current flatness based on the current flatness deviation adjustment amount and the current rolling parameter set includes: generating a current second variable parameter set based on the current flatness deviation adjustment amount and the current rolling parameter set, wherein the current rolling parameter set also includes the workpiece width, mill stiffness, and workpiece plasticity coefficient at the current stand; calculating the current second roll gap deviation adjustment amount based on a second preset relationship and the current second variable parameter set, wherein the second preset relationship characterizes the correspondence between the roll gap deviation adjustment amount and the second variable parameter set; reading the flatness-corresponding adjustment coefficient, and calculating the current flatness-corresponding roll gap deviation adjustment amount based on the flatness-corresponding adjustment coefficient and the current second roll gap deviation adjustment amount.

[0081] In this embodiment, the current flatness deviation adjustment amount, the workpiece thickness at the current stand inlet, the workpiece thickness at the current stand outlet, the workpiece width at the current stand, the mill stiffness, and the workpiece plasticity coefficient can all be used as independent variable parameters. The current second roll gap deviation adjustment amount is calculated using a second preset relationship. Then, the flatness-corresponding adjustment coefficient is multiplied by the current second roll gap deviation adjustment amount to obtain the current flatness-corresponding roll gap deviation adjustment amount. The flatness-corresponding adjustment coefficient can be preset or manually determined through on-site rolling adjustments. It can be set to a value between 0 and 1. The calculation method for the current flatness-corresponding roll gap deviation adjustment amount is illustrated below:

[0082] ΔS F =KP F ×f(δ F H en H ex Equation (3) (W,M,K)

[0083] Where, ΔS F KP represents the adjustment amount for the roll gap deviation corresponding to the current flatness. F δ is the adjustment coefficient corresponding to flatness. F H represents the current straightness deviation adjustment amount. en H represents the thickness of the rolled piece at the current stand entrance. ex Where is the thickness of the rolled piece at the current stand exit, W is the width of the rolled piece at the current stand, M is the mill stiffness at the current stand, K is the plasticity coefficient of the rolled piece at the current stand, and f(δ) F H en H ex ,W,M,K) as δ F H en H ex The functional relationship between W, M, and K as independent variables is the second presupposed relationship.

[0084] This embodiment, while considering strip flatness and thickness as influencing factors for roll gap deviation adjustment, also considers workpiece width, mill rigidity, and workpiece plasticity coefficient as influencing factors for roll gap deviation adjustment. This can further improve the accuracy of roll gap deviation adjustment and better adapt to different rolling conditions, thereby improving the flexibility and adaptability of thickness control.

[0085] Step S230: Based on the current hardness corresponding to the roll gap deviation adjustment amount and the current flatness corresponding to the roll gap deviation adjustment amount, determine the target roll gap deviation adjustment amount for the current frame, so as to control the roll gap of the current frame according to the target roll gap deviation adjustment amount.

[0086] In one embodiment of this application, an average roll gap deviation adjustment amount or a weighted average roll gap deviation adjustment amount can be calculated based on the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness, and used as the target roll gap deviation adjustment amount. Alternatively, the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness can be directly summed, and the summation result can be used as the target roll gap deviation adjustment amount. The target roll gap deviation adjustment amount is sent to the AGC, and the AGC generates a control command based on the target roll gap deviation adjustment amount and sends it to the HGC, so that the HGC responds to the control command to adjust the roll gap of the current frame.

[0087] It is understood that the target roll gap deviation adjustment amount includes the OS roll gap deviation adjustment amount and the DS roll gap deviation adjustment amount, which are equal in magnitude and opposite in direction. The roll gap deviation adjustment amount and the hydraulic cylinder position deviation adjustment amount have a fixed correspondence, which is usually determined during roll gap calibration. The target roll gap deviation adjustment amount can be converted into the corresponding hydraulic cylinder position deviation amount according to this correspondence, so that the HGC can be controlled.

[0088] In one embodiment of this application, before step S230, the method further includes: obtaining the current strip centerline deviation at the current stand exit; calculating the roll gap deviation adjustment amount by comparing the current strip centerline deviation with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current centerline, so as to determine the target roll gap deviation adjustment amount based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap deviation adjustment amount corresponding to the current flatness, and the roll gap deviation adjustment amount corresponding to the current centerline.

[0089] In this embodiment, the deviation of the strip centerline also has a certain impact on the accurate adjustment of the roll gap deviation. Therefore, while calculating the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness, the roll gap deviation adjustment amount corresponding to the current centerline is also calculated based on the current strip centerline deviation and the current rolling parameter set. The target roll gap deviation adjustment amount is determined by jointly considering the roll gap deviation adjustment amounts corresponding to the current hardness, current flatness, and current centerline, which can further improve the accuracy of the target roll gap deviation adjustment amount.

[0090] To determine the roll gap deviation adjustment amount corresponding to the current centerline, the functional relationship between the current strip centerline deviation, the inlet / outlet thickness and the roll gap deviation adjustment amount can be pre-fitted experimentally as a third functional relationship. Based on the current strip centerline deviation at the current stand exit, the rolled piece thickness at the current stand inlet / outlet, and the pre-determined third functional relationship, the roll gap deviation adjustment amount corresponding to the current centerline can be determined.

[0091] Indicatively, the roll gap deviation adjustment amounts corresponding to the current hardness, current flatness, and current centerline can be summed, averaged, or weighted averaged, and the calculation results can be used as the target roll gap deviation adjustment amount. There are no restrictions here.

[0092] In one embodiment of this application, the roll gap deviation adjustment amount is calculated by comparing the current strip centerline deviation with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current centerline. This includes: performing proportional-integral adjustment based on the current strip centerline deviation using a centerline-corresponding proportional-integral regulator to obtain the current centerline deviation adjustment amount; and determining the roll gap deviation adjustment amount corresponding to the current centerline based on the current centerline deviation adjustment amount and the current rolling parameter set.

[0093] This embodiment uses a proportional-integral regulator to determine the centerline deviation adjustment amount based on the centerline deviation of the strip, thereby improving the accuracy of subsequent roll gap adjustment and reducing the centerline deviation. This can effectively prevent the strip edge from being squeezed, deformed, folded, or even broken, and can improve the product's dimensional accuracy while improving the product's surface quality.

[0094] In one embodiment of this application, determining the roll gap deviation adjustment amount corresponding to the current centerline based on the current centerline deviation adjustment amount and the current rolling parameter set includes: generating a current third variable parameter set based on the current centerline deviation adjustment amount and the current rolling parameter set, wherein the current rolling parameter set also includes the workpiece width, mill stiffness, and workpiece plasticity coefficient at the current stand; calculating the current third roll gap deviation adjustment amount based on a third preset relationship and the current third variable parameter set, wherein the third preset relationship characterizes the correspondence between the roll gap deviation adjustment amount and the third variable parameter set; reading the centerline-corresponding adjustment coefficient, and calculating the current centerline-corresponding roll gap deviation adjustment amount based on the centerline-corresponding adjustment coefficient and the current third roll gap deviation adjustment amount.

[0095] In this embodiment, the current centerline deviation adjustment amount, the workpiece thickness at the current stand entrance, the workpiece thickness at the current stand exit, the workpiece width at the current stand, the mill stiffness, and the workpiece plasticity coefficient can all be used as independent variable parameters. The current third roll gap deviation adjustment amount is calculated using a third preset relationship. Then, the centerline-corresponding adjustment coefficient is multiplied by the current third roll gap deviation adjustment amount to obtain the current centerline-corresponding roll gap deviation adjustment amount. The centerline-corresponding adjustment coefficient can be preset or manually determined through on-site rolling adjustments. It can be set to a value between 0 and 1. The calculation method for the current centerline-corresponding roll gap deviation adjustment amount is illustrated below:

[0096] ΔS C =KP C ×f(δ C H en H ex Equation (4) (W,M,K)

[0097] Where, ΔS C KP represents the adjustment amount for the roll gap deviation corresponding to the current centerline. C δ is the adjustment coefficient corresponding to the center line. C H represents the current centerline deviation adjustment amount. en H represents the thickness of the rolled piece at the current stand entrance. ex Where is the thickness of the rolled piece at the current stand exit, W is the width of the rolled piece at the current stand, M is the mill stiffness at the current stand, K is the plasticity coefficient of the rolled piece at the current stand, and f(δ) C H en H ex ,W,M,K) as δ C H en H ex The functional relationship between W, M, and K as independent variables is the third presupposed relationship.

[0098] This embodiment, while taking the strip centerline deviation and thickness as influencing factors for roll gap deviation adjustment, also takes the workpiece width, mill rigidity and workpiece plasticity coefficient as influencing factors for roll gap deviation adjustment. This can further improve the accuracy of roll gap deviation adjustment and better adapt to different rolling conditions, thereby improving the flexibility and adaptability of thickness control.

[0099] In one embodiment of this application, determining the target roll gap deviation adjustment amount based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap deviation adjustment amount corresponding to the current straightness, and the roll gap deviation adjustment amount corresponding to the current centerline includes: determining the target process stage of the current stand according to its position in the rolling mill, and reading the control weight coefficient of the target process stage. The target process stage is one of the strip threading stage, rolling stage, and steel removal stage. The control weight coefficient of the target process stage includes the roll gap adjustment weight coefficient corresponding to hardness, the roll gap adjustment weight coefficient corresponding to straightness, and the roll gap adjustment weight coefficient corresponding to centerline; and performing a weighted calculation based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap adjustment weight coefficient corresponding to hardness, the roll gap deviation adjustment amount corresponding to the current straightness, the roll gap deviation adjustment amount corresponding to the current centerline, and the roll gap adjustment weight coefficient corresponding to centerline to obtain the target roll gap deviation adjustment amount.

[0100] In this embodiment, the strip rolling process is typically divided into three different process stages: the threading stage, the rolling stage, and the steel removal stage. Specifically, the 5 seconds after the steel bite can be considered the threading stage, the first 3 seconds before the tail end can be considered the steel removal stage, and the other intermediate processes can be considered the stable rolling stage (referred to as the rolling stage). Since the influence of hardness, straightness, and centerline deviation on roll gap adjustment varies at different process stages, roll gap adjustment weight coefficients corresponding to hardness, straightness, and centerline deviation can be pre-configured for each process stage. For example, straightness has a greater impact on roll gap adjustment during the strip threading stage, followed by the strip polishing stage, and finally the rolling stage. Therefore, the roll gap adjustment weight coefficient corresponding to straightness can be set higher during the strip threading stage. For instance, the roll gap adjustment weight coefficient corresponding to straightness can be set to 0.9 during the strip threading stage, 0.3 during the rolling stage, and 0.5 during the strip polishing stage. Similarly, centerline deviation has a greater impact on roll gap adjustment during the strip polishing stage, followed by the rolling stage, and finally the strip threading stage. Therefore, the roll gap adjustment weight coefficient corresponding to centerline deviation can be set higher during the strip polishing and rolling stages. For instance, the roll gap adjustment weight coefficient corresponding to centerline deviation can be set to 0.2 during the strip threading stage, 0.5 during the rolling stage, and 0.9 during the strip polishing stage. In addition, for different steel grades and specifications, the corresponding roll gap adjustment weight coefficients for different process stages can be pre-configured to form a control weight coefficient table.

[0101] The control weight coefficient table can be stored in the L2 system. Then, a request command is generated based on the current target process stage of the machine frame to retrieve the roll gap adjustment weight coefficients for hardness, flatness, and centerline at the target process stage from the L2 system. The roll gap deviation adjustment amount corresponding to the current hardness is multiplied by the roll gap adjustment weight coefficient corresponding to hardness; the roll gap deviation adjustment amount corresponding to the current flatness is multiplied by the roll gap adjustment weight coefficient corresponding to flatness; and the roll gap deviation adjustment amount corresponding to the current centerline is multiplied by the roll gap adjustment weight coefficient corresponding to the centerline. The results of these three multiplications are summed to obtain the target roll gap deviation adjustment amount.

[0102] This embodiment takes into account the different degrees of influence of hardness, flatness, and centerline deviation on roll gap adjustment in different process stages. It flexibly configures the roll gap adjustment weight coefficients of hardness, flatness, and centerline in different process stages to improve the accuracy and flexibility of determining the target roll gap deviation adjustment amount of the frame in different process stages, thereby improving the accuracy of strip thickness control.

[0103] In another embodiment of this application, determining the target roll gap deviation adjustment amount based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap deviation adjustment amount corresponding to the current straightness, and the roll gap deviation adjustment amount corresponding to the current centerline includes: obtaining the upstream feedforward roll gap deviation adjustment amount, which is obtained based on the current rolling parameter set, the upstream hardness deviation adjustment amount of the upstream stand, the upstream deviation adjustment amount, and the upstream centerline deviation adjustment amount; determining the target process stage of the current stand according to its position in the rolling mill, and reading the control weight coefficient of the target process stage, where the target process stage is the strip threading stage, the rolling stage, and the polishing stage. One of the control weight coefficients for the target process stage includes the feedforward roll gap adjustment weight coefficient, the hardness roll gap adjustment weight coefficient, the straightness roll gap adjustment weight coefficient, and the centerline roll gap adjustment weight coefficient. The target roll gap deviation adjustment amount is obtained by weighting the upstream feedforward roll gap deviation adjustment amount and the feedforward roll gap adjustment weight coefficient, the current hardness roll gap deviation adjustment amount and the hardness roll gap adjustment weight coefficient, the current straightness roll gap deviation adjustment amount and the straightness roll gap adjustment weight coefficient, and the current centerline roll gap deviation adjustment amount and the centerline roll gap adjustment weight coefficient.

[0104] In this embodiment, if the current stand is not the first stand in a multi-stand continuous rolling mill, the influence of the upstream stand (i.e., the stand preceding the current stand according to the rolling sequence) on the current stand can also be considered. Therefore, the upstream hardness deviation adjustment, the upstream deviation adjustment, and the upstream centerline deviation adjustment can be used as the feedforward control quantities of the upstream stand on the current stand, which can be simply referred to as the upstream stand feedforward control quantities. The calculation methods of the upstream hardness deviation adjustment, the upstream deviation adjustment, and the upstream centerline deviation adjustment are the same as those of the current hardness deviation adjustment, the current deviation adjustment, and the current centerline deviation adjustment, and will not be repeated here. The current rolling parameter set is calculated with the upstream hardness deviation adjustment amount, upstream straightness deviation adjustment amount, and upstream centerline deviation adjustment amount respectively to obtain the upstream hardness corresponding feedforward roll gap deviation adjustment amount, the upstream straightness corresponding feedforward roll gap deviation adjustment amount, and the upstream centerline corresponding feedforward roll gap deviation adjustment amount. The upstream hardness corresponding feedforward roll gap deviation adjustment amount, the upstream straightness corresponding feedforward roll gap deviation adjustment amount, and the upstream centerline corresponding feedforward roll gap deviation adjustment amount are summed to obtain the upstream stand feedforward roll gap deviation adjustment amount to the current stand, that is, the upstream feedforward roll gap deviation adjustment amount.

[0105] The calculation method for the upstream hardness corresponding to the feedforward roll gap deviation adjustment is illustrated below:

[0106] ΔS' H =KP' H ×f(δ' H H en H ex Equation (5) (W,M,K)

[0107] Wherein, ΔS' H KP' represents the adjustment amount of the feedforward roll gap deviation corresponding to the upstream hardness. H The feedforward adjustment coefficient corresponding to hardness can be preset or manually determined through on-site rolling adjustments, δ' H H is the upstream hardness deviation adjustment amount. en H represents the thickness of the rolled piece at the current stand entrance. ex Where is the thickness of the rolled piece at the current stand exit, W is the width of the rolled piece at the current stand, M is the mill stiffness at the current stand, K is the plasticity coefficient of the rolled piece at the current stand, and f(δ') H H en H ex ,W,M,K) is based on δ' H H en H ex The functional relationship between W, M, and K as independent variables can be determined in advance through experiments.

[0108] The following is an illustrative example of how to calculate the feedforward roll gap deviation adjustment amount corresponding to upstream straightness:

[0109] ΔS' F =KP' F ×f(δ' F H en H ex Equation (6) (W,M,K)

[0110] Wherein, ΔS' F KP' represents the adjustment amount of the feedforward roll gap deviation corresponding to the upstream straightness. F The feedforward adjustment coefficient corresponding to flatness can be preset or manually determined through on-site rolling debugging, δ' F H represents the upstream straightness deviation adjustment amount. en H represents the thickness of the rolled piece at the current stand entrance. ex Where is the thickness of the rolled piece at the current stand exit, W is the width of the rolled piece at the current stand, M is the mill stiffness at the current stand, K is the plasticity coefficient of the rolled piece at the current stand, and f(δ') F H en H ex ,W,M,K) is based on δ' F H en H ex The functional relationship between W, M, and K as independent variables can be determined in advance through experiments.

[0111] The calculation method for the feedforward roll gap deviation adjustment corresponding to the upstream centerline is illustrated below:

[0112] ΔS' C =KP' C ×f(δ' C H en H ex Equation (7) (W,M,K)

[0113] Wherein, ΔS' C KP' is the adjustment amount of the feedforward roll gap deviation corresponding to the upstream centerline. C The feedforward adjustment coefficient corresponding to the centerline can be preset or manually determined through on-site rolling debugging, δ' C H is the adjustment amount for the upstream centerline deviation. en H represents the thickness of the rolled piece at the current stand entrance. ex Where is the thickness of the rolled piece at the current stand exit, W is the width of the rolled piece at the current stand, M is the mill stiffness at the current stand, K is the plasticity coefficient of the rolled piece at the current stand, and f(δ') C H en H ex ,W,M,K) is based on δ' C H en H exThe functional relationship between W, M, and K as independent variables can be determined in advance through experiments.

[0114] The upstream feedforward roll gap deviation adjustment amount is multiplied by the feedforward corresponding roll gap adjustment weight coefficient. The current hardness corresponding roll gap deviation adjustment amount is multiplied by the hardness corresponding roll gap adjustment weight coefficient. The current flatness corresponding roll gap deviation adjustment amount is multiplied by the flatness corresponding roll gap adjustment weight coefficient. The current centerline corresponding roll gap deviation adjustment amount is multiplied by the centerline corresponding roll gap adjustment weight coefficient. The results of the four multiplication operations are summed to obtain the target roll gap deviation adjustment amount. Before this, the feedforward corresponding roll gap adjustment weight coefficients in different process stages can be pre-configured and added to the control weight coefficient table.

[0115] This embodiment takes into account the varying degrees of influence of hardness, straightness, and centerline deviation on roll gap adjustment at different process stages. It also considers the influence of upstream stand hardness, straightness, and centerline deviation on the current stand roll gap adjustment. Based on the aforementioned embodiment, feedforward control is added, which can more accurately adjust the roll gap, thereby further improving rolling accuracy and reducing product errors.

[0116] In one embodiment of this application, controlling the roll gap of the current frame according to the target roll gap deviation adjustment amount includes: obtaining the conventional roll gap deviation adjustment amount of the current frame; determining the final roll gap deviation adjustment amount of the current frame based on the conventional roll gap deviation adjustment amount and the target roll gap deviation adjustment amount, so as to control the roll gap of the current frame according to the final roll gap deviation adjustment amount.

[0117] In this embodiment, the traditional leveling method of the rolling mill is mainly achieved by manual adjustment by the operator based on the waviness. The maximum adjustment amount is limited. Therefore, the adjustment amount manually intervened by the operator can be received as the traditional roll gap deviation adjustment amount. The total roll gap deviation adjustment amount, i.e., the final roll gap deviation adjustment amount, is calculated based on the traditional roll gap deviation adjustment amount and the target roll gap deviation adjustment amount. The total roll gap deviation adjustment amount is executed by the HGC. The calculation method of the total roll gap deviation adjustment amount is illustrated as follows:

[0118] ΔS = ΔS 传统 +k×ΔS 目标 Equation (8)

[0119] Where ΔS is the total roll gap deviation adjustment amount, ΔS 传统 For traditional roll gap deviation adjustment, k is the weighting coefficient of the target roll gap deviation adjustment, which can be set to a value less than or equal to 1, ΔS 目标 The target roll gap deviation adjustment amount.

[0120] It is understandable that the final roll gap deviation adjustment amount includes the OS roll gap deviation adjustment amount and the DS roll gap deviation adjustment amount, which are equal in magnitude and opposite in direction. Based on the fixed correspondence between the roll gap deviation adjustment amount and the hydraulic cylinder position deviation adjustment amount, the final roll gap deviation adjustment amount can be converted into the corresponding hydraulic cylinder position deviation amount for HGC control.

[0121] This embodiment combines the machine theory of target roll gap deviation adjustment with the practical experience of manual roll gap deviation adjustment to achieve human-machine collaboration. It leverages the experience and intuition of manual adjustment while combining the precision of machine adjustment, thus achieving complementary advantages between humans and machines and improving the overall control effect of roll gap adjustment.

[0122] In one embodiment of this application, the strip mill control method further includes: determining the actual value of symmetrical straightness based on the straightness field, comparing the actual value of symmetrical straightness with the reference value of symmetrical straightness to obtain a straightness deviation value; and adjusting the bending roll force of the current stand according to the straightness deviation value so that the symmetrical straightness of the strip reaches the reference value of symmetrical straightness.

[0123] In this embodiment, the detected flatness can also be used for feedback control of the current frame's symmetrical flatness, which is achieved by adjusting the bending roller force. The adjustment amount is calculated by the original model and output uniformly.

[0124] Indicatively, the original straightness model is a symmetrical straightness feedback control, using PI control mode. The calculation method for the additional bending force of the symmetrical straightness feedback control is as follows:

[0125]

[0126] Where, ΔF B ΔC2 represents the additional bending force for symmetrical straightness feedback control, and ΔC2 is the deviation between the actual symmetrical straightness value and the symmetrical straightness reference value. The bending force sensitivity coefficient is the coefficient for symmetrical straightness.

[0127] The deviation between the actual value and the reference value of symmetry straightness is calculated as follows:

[0128] ΔC2=C2-C 20 Equation (10)

[0129] Where ΔC2 is the deviation between the actual value of symmetry straightness and the reference value of symmetry straightness, C2 is the actual value of symmetry straightness, and C 20 This is a reference value for symmetry and straightness.

[0130] For the adjusted straightness model, the calculation method for the additional value of the bending roll force in symmetrical straightness feedback control is as follows:

[0131]

[0132] Where, ΔF B The bending roll force is the added value for symmetrical straightness feedback control. k1 is the control weight of the original straightness model, and k2 is the control weight of the measured straightness model. Both k1 and k2 are less than 1 and greater than 0, and satisfy k1+k2≤1. The specific values ​​can be manually modified according to the on-site debugging effect. ΔC2 is the deviation between the actual value of symmetrical straightness and the reference value of symmetrical straightness, and ΔC′2 is the deviation between the target straightness of the current frame and the measured straightness. The bending force sensitivity coefficient is the coefficient for symmetrical straightness.

[0133] The bending roll force sensitivity coefficient, symmetrical straightness reference value, and current frame target straightness can be preset and stored in the L2 system. The actual symmetrical straightness value and measured straightness can be calculated based on the current strip straightness field. It is understood that the additional bending roll force value includes the OS bending roll force additional value and the DS bending roll force additional value, both of which are equal in magnitude and in the same direction.

[0134] Compared with traditional control methods, the embodiments of this application can significantly improve the accuracy of plate shape control and thus improve the quality of plate shape by adding the function of adjusting the bending roller force according to the flatness distribution field. Plate shape refers to flatness and convexity.

[0135] Please see Figure 5 , Figure 5 This is a block diagram illustrating a strip mill control device according to an exemplary embodiment of this application. The device can be applied to… Figure 1 The implementation environment shown is not limited to any particular environment. This device can also be applied to other exemplary implementation environments, and this embodiment does not limit the implementation environment to which the device is applicable. Figure 5 As shown, the exemplary strip mill control device includes: a data acquisition module 510, used to acquire the current rolling parameter set of the current stand and the current strip hardness field and current strip flatness field at the exit of the current stand, wherein the current rolling parameter set includes at least the workpiece thickness at the entrance of the current stand and the workpiece thickness at the exit of the current stand; an information processing module 520, used to calculate the roll gap deviation adjustment amount by comparing the current strip hardness field and the current strip flatness field with the current rolling parameter set, respectively, to obtain the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness, and to determine the target roll gap deviation adjustment amount for the current stand based on the roll gap deviation adjustment amount corresponding to the current hardness and the roll gap deviation adjustment amount corresponding to the current flatness; and an execution module 530, used to control the roll gap of the current stand through control commands, wherein the control commands are generated based on the target roll gap deviation adjustment amount.

[0136] In this embodiment, the data acquisition module 510 may include a temperature field sensor, a flatness measuring instrument, and a thickness gauge, and may also include image acquisition devices such as a camera or video camera. The data acquisition module 510 may also be a hardware device that collects data acquired by the temperature field sensor, flatness measuring instrument, and thickness gauge. The information processing module 520 may be a computer device such as a microcomputer, embedded computer, or neural network computer, or an L1 system, L2 system, or server. The execution module 530 may include an HGC (High-Level Controller) and may also include an AGC (Automatic Generative Controller).

[0137] It should be noted that the strip mill control device and the strip mill control method provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the strip mill control device provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0138] In one specific embodiment of this application, the strip mill control device can be a composite measurement and control system, including a measurement system, an L1 system, an L2 system, an AGC (Automatic Gauge Control), and HGCs for each stand. The measurement system is a specific example of the data acquisition module 510, and includes at least temperature field sensors, flatness measuring instruments, thickness gauges, and other detection instruments, specifically including but not limited to machine vision systems and area array infrared detectors. The L1 and L2 systems are specific examples of the information processing module 520, and the AGC and HGCs for each stand are examples of the execution module 530. Please refer to [link to relevant documentation]. Figures 6-10 , Figure 6 This is a flowchart illustrating the operation of a composite measurement and control system according to a specific embodiment of this application. Figure 7 yes Figure 6 The flowchart of the calculation process of the LCM model of the Fi rack in the specific embodiment shown is shown in one specific embodiment. Figure 8 yes Figure 7 The flowchart of the calculation of the LCM1 model in a specific embodiment is shown below. Figure 9 yes Figure 7 The flowchart of the calculation process of the LCM2 model in a specific embodiment is shown below. Figure 10 yes Figure 7 The flowchart of the calculation of the LCM4 model in a specific embodiment is shown.

[0139] like Figure 6 As shown, for the Fi rack, the workflow of the composite measurement and control system is as follows:

[0140] 1. Deploy the LCM (Level Calculation Model) of each rack in the L1 system in advance.

[0141] 2. The L1 system acquires in real-time the hardness field, straightness field, and centerline deviation of the strip in the width direction at the Fi stand exit via a measurement system, as well as the inlet thickness, outlet thickness, strip width, rolling stiffness, and strip plasticity coefficient at the Fi stand. The hardness field in the width direction of the strip at the Fi stand exit is determined based on the temperature field in the width direction of the strip at the Fi stand exit, the rolling speed and rolling tension at the Fi stand, and the steel grade, plasticity coefficient, and deformation resistance of the strip. If the Fi stand is not the first stand of a multi-stand rolling mill, the L1 system can also acquire the feedforward control parameters of the Fi-1 stand via the Fi-1 stand LCM. If the Fi stand is a single-stand rolling mill, or the first stand of a multi-stand rolling mill, the feedforward control function can be disabled.

[0142] 3. The L1 system inputs the feedforward control quantity of the Fi-1 stand, the hardness field, straightness field and centerline deviation of the strip width direction at the Fi stand exit, the inlet thickness, outlet thickness, strip width, rolling stiffness and strip plasticity coefficient at the Fi stand to the Fi stand LCM, and calculates the roll gap deviation adjustment amount of the Fi stand OS and DS through the Fi stand LCM.

[0143] 4. AGC controls the HGC of the Fi frame based on the roll gap deviation adjustment of the OS and DS of the Fi frame, so that the HGC of the Fi frame can perform hydraulic roll gap adjustment.

[0144] In a schematic representation, the measurement system can be configured with data processing chips such as MCUs and ECUs. These chips process data such as temperature fields or images to obtain parameters like hardness field, workpiece width, and centerline deviation. Alternatively, the L1 system can process the temperature field or image data to reduce the load on the measurement system. Furthermore, a machine vision system can be used for image recognition to measure temperature and flatness. This eliminates the need for length-direction stitching, resulting in higher efficiency. The machine vision systems used for width or temperature field measurement can also be shared. Since flatness measurement accuracy doesn't need to be too high, the flatness measuring instrument can output the length of each measurement line to the L1 system, which then calculates the weighted flatness, further improving efficiency and facilitating real-time control.

[0145] like Figure 7 As shown, the Fi rack LCM model includes four sub-models: LCM1, LCM2, LCM3, and LCM4. The calculation process for the Fi rack LCM model is as follows:

[0146] 1. The LCM1 model calculates the feedforward roll gap deviation adjustment of the Fi-1 stand to the Fi stand based on the feedforward control of the Fi-1 stand and the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand. This includes the Fi stand OS roll gap adjustment (abbreviation for roll gap deviation adjustment) and the Fi stand DS roll gap adjustment, which are equal in magnitude and opposite in direction. The LCM2 model calculates the roll gap deviation adjustment corresponding to the hardness of the Fi stand based on the strip hardness field at the Fi stand outlet and the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand. This also includes the Fi stand OS roll gap adjustment and the Fi stand DS roll gap adjustment, which are equal in magnitude and opposite in direction. The LCM3 model calculates the roll gap deviation adjustment amount corresponding to the straightness of the Fi stand based on the strip straightness field at the Fi stand exit, as well as the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand. This includes the Fi stand OS roll gap adjustment amount and the Fi stand DS roll gap adjustment amount, which are equal in magnitude but opposite in direction. The LCM4 model calculates the roll gap deviation adjustment amount corresponding to the centerline of the Fi stand based on the strip centerline deviation at the Fi stand exit, as well as the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand. This includes the Fi stand OS roll gap adjustment amount and the Fi stand DS roll gap adjustment amount, which are equal in magnitude but opposite in direction.

[0147] 2. The LCM model calculates the target roll gap deviation adjustment amount for the Fi frame by weighted summing based on the control weight coefficients of the target process stage where the Fi frame is located, the feedforward roll gap deviation adjustment amount of the Fi-1 frame to the Fi frame, the roll gap deviation adjustment amount corresponding to the hardness of the Fi frame, the roll gap deviation adjustment amount corresponding to the straightness, and the roll gap deviation adjustment amount corresponding to the centerline. This results in the target roll gap deviation adjustment amount for the Fi frame, including the OS roll gap adjustment amount and the DS roll gap adjustment amount for the Fi frame. These two amounts are equal in magnitude and opposite in direction. Since there are many steel grades and specifications, there are also many control weight coefficients for each process stage determined based on each steel grade and specification. The control weight coefficients for each process stage can be pre-set in the L2 system to reduce the pressure on the L1 system. The L1 system obtains the control weight coefficients of the target process stage from the L2 system and inputs them into the LCM model. The control weight coefficients include the feedforward roll gap adjustment weight coefficient, the hardness roll gap adjustment weight coefficient, the straightness roll gap adjustment weight coefficient, and the centerline roll gap adjustment weight coefficient.

[0148] 3. The L1 system will also acquire the roll gap deviation adjustment amount of the traditional leveling function of the Fi frame, i.e., the traditional roll gap deviation adjustment amount, including the Fi frame OS roll gap adjustment amount and the Fi frame DS roll gap adjustment amount. The two are equal in magnitude and opposite in direction. The LCM model performs summation or weighted summation calculation based on the traditional roll gap deviation adjustment amount input from the L1 system and the calculated target roll gap deviation adjustment amount to obtain the total leveling roll gap adjustment amount of the Fi frame, i.e., the final roll gap deviation adjustment amount, including the total leveling roll gap adjustment amount of the Fi frame OS and the total leveling roll gap adjustment amount of the Fi frame DS. The two are equal in magnitude and opposite in direction. The LCM model outputs the total leveling roll gap adjustment amount of the Fi frame. The AGC controls the AGC of the Fi frame based on the total leveling roll gap adjustment amount of the Fi frame, so that the AGC of the Fi frame performs hydraulic roll gap adjustment.

[0149] like Figure 8 As shown, the calculation process of the LCM1 model is as follows:

[0150] 1. According to formula (5), based on the hardness deviation adjustment amount of the Fi-1 stand, and the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand, calculate the feedforward roll gap deviation adjustment amount corresponding to the upstream hardness; according to formula (6), based on the straightness deviation adjustment amount of the Fi-1 stand, and the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand, calculate the feedforward roll gap deviation adjustment amount corresponding to the upstream straightness; according to formula (7), based on the centerline deviation adjustment amount of the Fi-1 stand, and the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand, calculate the feedforward roll gap deviation adjustment amount corresponding to the upstream centerline; wherein, the feedforward control amount of the Fi-1 stand includes the hardness deviation adjustment amount, straightness deviation adjustment amount, and centerline deviation adjustment amount of the Fi-1 stand;

[0151] 2. The feedforward roll gap deviation adjustment amount corresponding to upstream hardness, upstream straightness, and upstream centerline is summed and calculated to obtain the feedforward roll gap deviation adjustment amount of frame Fi-1 to frame Fi.

[0152] like Figure 9 As shown, the calculation process of the LCM2 model is as follows:

[0153] 1. Calculate the DS-weighted hardness and OS-weighted hardness based on the strip hardness field at the Fi frame outlet. Calculate the difference between the two using a subtractor. Input the difference into a closed-loop PI controller. Perform proportional and integral adjustments using the P and I controllers respectively. Summate the outputs of the P and I controllers using an adder to obtain the hardness deviation adjustment amount for the Fi frame. A delay is required during the steel biting stage to avoid instability interference during this stage.

[0154] 2. According to formula (2), based on the hardness deviation adjustment amount of the Fi stand, as well as the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand, calculate the roll gap deviation adjustment amount corresponding to the hardness of the Fi stand.

[0155] The calculation process for the roll gap deviation adjustment amount corresponding to the flatness of the Fi frame in the LCM3 model can be referred to the calculation process for the roll gap deviation adjustment amount corresponding to the hardness of the Fi frame in the LCM2 model, and will not be repeated here.

[0156] like Figure 10 As shown, the calculation process of the LCM4 model is as follows:

[0157] 1. Input the centerline deviation of the strip at the Fi rack outlet into the PI controller. Perform proportional and integral regulation through the P controller and I controller respectively. Summate the output of the P controller and the output of the I controller through an adder to obtain the centerline deviation adjustment amount of the Fi rack. The setpoint in the PI controller is set to 0, and the actual value is the centerline deviation of the strip.

[0158] 2. According to formula (4), based on the centerline deviation adjustment amount of the Fi stand, as well as the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand, calculate the roll gap deviation adjustment amount corresponding to the centerline of the Fi stand.

[0159] Figures 6-10 For detailed procedures of the specific embodiments shown, please refer to the descriptions in the foregoing embodiments; they will not be repeated here. It should be noted that the detection cycle of inputting real-time values ​​into the LCM model and the calculation cycle of the LCM model should be comparable to the scanning cycle of the AGC.

[0160] In another specific embodiment of this application, the strip mill control device can specifically be a dual closed-loop control system, including a measurement system, an L1 system, an AGC (Automatic Gauge Control), and HGCs for each stand. The measurement system is a specific example of the data acquisition module 510, and includes at least temperature field sensors, flatness measuring instruments, thickness gauges, and other detection instruments, specifically including but not limited to machine vision systems and area array infrared detectors. The L1 system is a specific example of the information processing module 520, and the AGC and HGCs for each stand are examples of the execution module 530. Please refer to [link to relevant documentation]. Figure 11 , Figure 11 This is a flowchart illustrating the operation of a dual closed-loop control system, as shown in another specific embodiment of this application. Figure 11 As shown, this dual closed-loop control system uses hardness and flatness as the inner loops and centerline deviation as the outer loop. For the Fi frame, the workflow of this dual closed-loop control system is as follows:

[0161] 1. The L1 system acquires in real time the hardness field, straightness field and centerline deviation of the strip in the width direction at the exit of the Fi stand through the measurement system, as well as the inlet thickness, outlet thickness, strip width, rolling stiffness and strip plasticity coefficient at the Fi stand.

[0162] 2. The L1 system uses the centerline deviation of the strip at the Fi rack outlet as the actual value of the centerline deviation, calculates the difference between the preset centerline deviation setpoint and the actual value of the centerline deviation, inputs it into the corresponding PI controller of the centerline, and adjusts the centerline deviation of the Fi rack through proportional-integral adjustment.

[0163] 3. The L1 system calculates the actual difference between the weighted hardness on the DS side and the weighted hardness on the OS side based on the strip hardness field at the Fi stand exit, i.e., the actual value of the weighted hardness DS-OS. The preset instantaneous value of the weighted hardness DS-OS is multiplied by the coefficient α1 as the first result. The centerline deviation adjustment amount of the Fi stand is multiplied by the coefficient α2 as the second result. The first result and the second result are summed, and the difference between the summation result and the actual value of the weighted hardness DS-OS is calculated. The result is input into the hardness corresponding PI regulator. The hardness deviation adjustment amount of the Fi stand is adjusted through proportional-integral method. According to formula (2), based on the hardness deviation adjustment amount of the Fi stand, as well as the inlet thickness, outlet thickness, roll width, rolling stiffness, and roll plasticity coefficient at the Fi stand, the roll gap deviation adjustment amount corresponding to the hardness of the Fi stand is calculated. The weighted straightness on the DS side and the O side are calculated based on the strip straightness field at the Fi stand exit. The actual difference of the weighted straightness on the S side, i.e. the actual value of the weighted straightness DS-OS, is multiplied by the preset instantaneous value of the weighted straightness DS-OS and the coefficient β1 as the third result. The centerline deviation adjustment amount of the Fi stand is multiplied by the coefficient β2 as the fourth result. The third result and the fourth result are summed, and the difference between the summation result and the actual value of the weighted straightness DS-OS is calculated. The result is input into the straightness corresponding PI regulator and adjusted to the straightness deviation adjustment amount of the Fi stand through proportional-integral adjustment. According to formula (3), based on the straightness deviation adjustment amount of the Fi stand, as well as the inlet thickness, outlet thickness, workpiece width, rolling stiffness, and workpiece plasticity coefficient at the Fi stand, the roll gap deviation adjustment amount corresponding to the straightness of the Fi stand is calculated. The roll gap deviation adjustment amount corresponding to the hardness of the Fi stand and the roll gap deviation adjustment amount corresponding to the straightness of the Fi stand are added together to obtain the target roll gap deviation adjustment amount.

[0164] 4. AGC controls the HGC of the Fi frame according to the target roll gap deviation adjustment amount, so that the HGC of the Fi frame performs hydraulic roll gap adjustment.

[0165] Where α1, α2, β1, and β2 are all greater than or equal to 0. In this dual closed-loop control system, the inner loop can be reduced. That is, if the adjustment amount of roll gap deviation corresponding to hardness or roll gap deviation corresponding to flatness cannot be obtained in time due to system or data abnormalities, the target roll gap deviation adjustment amount can be obtained directly from the other loop for roll gap control.

[0166] This embodiment also provides an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, enable the electronic device to implement the strip mill control method provided in the above embodiments.

[0167] Please see Figure 12 , Figure 12 This is a schematic diagram illustrating the structure of an electronic device according to an exemplary embodiment of this application. It should be noted that... Figure 12 The electronic device 1200 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0168] like Figure 12 As shown, the electronic device 1200 includes a processor 1201, a memory 1202, and a communication bus 1203; the communication bus 1203 is used to connect the processor 1201 and the memory 1202; the processor 1201 is used to execute a computer program stored in the memory 1202 to implement one or more methods as described in the above embodiments.

[0169] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a computer's processor, causes the computer to perform the strip mill control method as described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not be assembled into the electronic device.

[0170] This embodiment also provides a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the strip mill control method provided in the above embodiments.

[0171] The electronic device provided in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication between them. The memory is used to store computer programs, the communication interface is used to perform communication, and the processor and the transceiver are used to run the computer programs, so that the electronic device performs the various steps of the above method.

[0172] In this embodiment, the memory may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0173] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0174] As will be understood by those skilled in the art, the computer-readable storage medium described in this embodiment allows for the implementation of all or part of the steps in the above method embodiments by computer program-related hardware. The aforementioned computer program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM (Read-Only Memory), RAM (Random Access Memory), magnetic disks, or optical disks.

[0175] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A control method for a strip rolling mill, characterized in that, The method includes: Obtain the current rolling parameter set for the current stand, as well as the current strip hardness field, current strip straightness field, and current strip centerline deviation at the current stand exit. The current rolling parameter set includes at least the workpiece thickness at the current stand inlet and the workpiece thickness at the current stand outlet. The current strip hardness field, current strip straightness field, and current strip centerline deviation are respectively compared with the current rolling parameter group to calculate the roll gap deviation adjustment amount, and the roll gap deviation adjustment amount corresponding to the current hardness, the current straightness, and the current centerline. Based on the current roll gap deviation adjustment amount corresponding to the current hardness, the current roll gap deviation adjustment amount corresponding to the current straightness, and the current centerline roll gap deviation adjustment amount, a target roll gap deviation adjustment amount for the current stand is determined, so that the roll gap of the current stand is controlled according to the target roll gap deviation adjustment amount. The method for determining the target roll gap deviation adjustment amount includes: determining the target process stage of the current stand according to its position in the rolling mill, and reading the control weight coefficient of the target process stage. The target process stage is one of the strip threading stage, rolling stage, and steel removal stage. The control weight coefficient of the target process stage includes the roll gap adjustment weight coefficient corresponding to hardness, the roll gap adjustment weight coefficient corresponding to straightness, and the roll gap adjustment weight coefficient corresponding to centerline. The target roll gap deviation adjustment amount is obtained by weighted calculation based on the current roll gap deviation adjustment amount corresponding to hardness, the roll gap adjustment weight coefficient corresponding to hardness, the roll gap deviation adjustment amount corresponding to straightness, and the roll gap deviation adjustment amount corresponding to centerline.

2. The strip mill control method according to claim 1, characterized in that, The roll gap deviation adjustment is calculated by comparing the current strip hardness field with the current rolling parameter set, resulting in the roll gap deviation adjustment corresponding to the current hardness, including: Obtain the current centerline deviation of the strip at the current rack exit, and adjust the current centerline deviation by proportional-integral regulator corresponding to the centerline based on the current centerline deviation. The current strip hardness field is divided into an operating side hardness field and a transmission side hardness field according to the rolling center line. The operating side comprehensive hardness is obtained based on the operating side hardness field, and the transmission side comprehensive hardness is obtained based on the transmission side hardness field. The current hardness deviation adjustment amount is obtained by proportional-integral adjustment based on the current centerline deviation adjustment amount, the overall hardness of the operating side, and the overall hardness of the transmission side using a hardness-corresponding proportional-integral adjuster. Based on the current hardness deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current hardness.

3. The strip mill control method according to claim 1, characterized in that, The roll gap deviation adjustment amount is calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness, including: Obtain the current centerline deviation of the strip at the current rack exit, and adjust the current centerline deviation by proportional-integral regulator corresponding to the centerline based on the current centerline deviation. The current strip flatness field is divided into an operating side flatness field and a transmission side flatness field according to the rolling center line. The operating side comprehensive flatness is obtained based on the operating side flatness field, and the transmission side comprehensive flatness is obtained based on the transmission side flatness field. The flatness corresponding proportional-integral regulator performs proportional-integral adjustment based on the current centerline deviation adjustment amount, the overall flatness of the operating side, and the overall flatness of the transmission side to obtain the current flatness deviation adjustment amount; Based on the current flatness deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current flatness.

4. The strip mill control method according to claim 1, characterized in that, The roll gap deviation adjustment is calculated by comparing the current strip hardness field with the current rolling parameter set, resulting in the roll gap deviation adjustment corresponding to the current hardness, including: The current strip hardness field is divided into an operating side hardness field and a transmission side hardness field according to the rolling center line. The operating side comprehensive hardness is obtained based on the operating side hardness field, and the transmission side comprehensive hardness is obtained based on the transmission side hardness field. The current hardness deviation adjustment amount is obtained by performing proportional-integral adjustment based on the comprehensive hardness of the operating side and the comprehensive hardness of the transmission side using a hardness-corresponding proportional-integral regulator. Based on the current hardness deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current hardness.

5. The strip mill control method according to claim 1, characterized in that, The roll gap deviation adjustment amount is calculated by comparing the current strip flatness field with the current rolling parameter set to obtain the roll gap deviation adjustment amount corresponding to the current flatness, including: The current strip flatness field is divided into an operating side flatness field and a transmission side flatness field according to the rolling center line. The operating side comprehensive flatness is obtained based on the operating side flatness field, and the transmission side comprehensive flatness is obtained based on the transmission side flatness field. The flatness corresponding proportional-integral regulator performs proportional-integral adjustment based on the overall flatness of the operating side and the overall flatness of the transmission side to obtain the current flatness deviation adjustment amount; Based on the current flatness deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current flatness.

6. The strip mill control method according to claim 1, characterized in that, The roll gap deviation adjustment amount is calculated by comparing the current strip centerline deviation with the current rolling parameter set, resulting in the roll gap deviation adjustment amount corresponding to the current centerline, including: The current centerline deviation adjustment amount is obtained by using the proportional-integral regulator corresponding to the centerline to perform proportional-integral adjustment based on the current deviation of the strip centerline. Based on the current centerline deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current centerline.

7. The strip mill control method according to any one of claims 2 or 4, characterized in that, Based on the current hardness deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current hardness, including: The current first variable parameter group is generated based on the current hardness deviation adjustment amount and the current rolling parameter group. The current rolling parameter group also includes the workpiece width, mill stiffness and workpiece plasticity coefficient at the current stand. The current first roll gap deviation adjustment amount is calculated based on the first preset relationship and the current first variable parameter group. The first preset relationship represents the correspondence between the roll gap deviation adjustment amount and the first variable parameter group. Read the adjustment coefficient corresponding to the hardness, and calculate the adjustment amount of the roll gap deviation corresponding to the current hardness based on the adjustment coefficient corresponding to the hardness and the current first roll gap deviation adjustment amount.

8. The strip mill control method according to any one of claims 2 or 4, characterized in that, The operating side comprehensive hardness is obtained based on the operating side hardness field, and the transmission side comprehensive hardness is obtained based on the transmission side hardness field, including: The hardness at different positions on the operating side and the hardness weighting coefficient at each position on the operating side are weighted and calculated to obtain the weighted hardness of the operating side, which is used as the comprehensive hardness of the operating side. The hardness field of the operating side includes the hardness at different positions on the operating side, and the hardness weighting coefficient at each position on the operating side is determined based on the distance between the position and the rolling center line. The hardness at different positions on the transmission side and the hardness weighting coefficient at each position on the transmission side are weighted and calculated to obtain the weighted hardness of the transmission side, which is used as the comprehensive hardness of the transmission side. The hardness field of the transmission side includes the hardness at different positions on the transmission side, and the hardness weighting coefficient at each position on the transmission side is determined based on the distance between the position and the rolling center line.

9. The strip mill control method according to any one of claims 3 or 5, characterized in that, Based on the current flatness deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current flatness, including: The current second variable parameter set is generated based on the current flatness deviation adjustment amount and the current rolling parameter set. The current rolling parameter set also includes the workpiece width, mill stiffness and workpiece plasticity coefficient at the current stand. The current second roll gap deviation adjustment amount is calculated based on the second preset relationship and the current second variable parameter group. The second preset relationship represents the correspondence between the roll gap deviation adjustment amount and the second variable parameter group. Read the flatness corresponding adjustment coefficient, and calculate the current flatness corresponding roll gap deviation adjustment amount based on the flatness corresponding adjustment coefficient and the current second roll gap deviation adjustment amount.

10. The strip mill control method according to any one of claims 3 or 5, characterized in that, The overall straightness of the operating side is obtained based on the straightness field of the operating side, and the overall straightness of the transmission side is obtained based on the straightness field of the transmission side, including: The flatness at different positions on the operating side and the flatness weighting coefficient at each position on the operating side are weighted and calculated to obtain the weighted flatness of the operating side, which is used as the comprehensive flatness of the operating side. The flatness field of the operating side includes the flatness at different positions on the operating side, and the flatness weighting coefficient at each position on the operating side is determined based on the distance between the position and the rolling center line. The flatness at different positions on the transmission side and the flatness weighting coefficient at each position on the transmission side are weighted and calculated to obtain the weighted flatness of the transmission side, which is used as the comprehensive flatness of the transmission side. The flatness field of the transmission side includes the flatness at different positions on the transmission side, and the flatness weighting coefficient at each position on the transmission side is determined based on the distance between the position and the rolling center line.

11. The strip mill control method according to claim 6, characterized in that, Based on the current centerline deviation adjustment amount and the current rolling parameter set, determine the roll gap deviation adjustment amount corresponding to the current centerline, including: The current third variable parameter group is generated based on the current centerline deviation adjustment and the current rolling parameter group. The current rolling parameter group also includes the workpiece width, mill stiffness and workpiece plasticity coefficient at the current stand. The current third roll gap deviation adjustment amount is calculated based on the third preset relationship and the current third variable parameter group. The third preset relationship represents the correspondence between the roll gap deviation adjustment amount and the third variable parameter group. Read the adjustment coefficient corresponding to the center line, and calculate the current center line corresponding to the roll gap deviation adjustment amount based on the adjustment coefficient corresponding to the center line and the current third roll gap deviation adjustment amount.

12. The strip mill control method according to any one of claims 1, 4, 5 or 6, characterized in that, The target roll gap deviation adjustment amount is determined based on the roll gap deviation adjustment amount corresponding to the current hardness, the roll gap deviation adjustment amount corresponding to the current flatness, and the roll gap deviation adjustment amount corresponding to the current centerline, including: The upstream feedforward roll gap deviation adjustment amount is obtained based on the current rolling parameter set, the upstream hardness deviation adjustment amount of the upstream stand, the upstream straightness deviation adjustment amount, and the upstream centerline deviation adjustment amount. The target process stage of the current stand is determined according to its position in the rolling mill, and the control weight coefficient of the target process stage is read. The target process stage is one of the strip threading stage, rolling stage and steel throwing stage. The control weight coefficient of the target process stage includes the feedforward corresponding roll gap adjustment weight coefficient, the hardness corresponding roll gap adjustment weight coefficient, the flatness corresponding roll gap adjustment weight coefficient, and the centerline corresponding roll gap adjustment weight coefficient. The target roll gap deviation adjustment amount is obtained by weighting the adjustment amount of the upstream feedforward roll gap deviation, the adjustment amount of the roll gap deviation corresponding to the current hardness, the adjustment amount of the roll gap deviation corresponding to the current straightness, the adjustment amount of the roll gap deviation corresponding to the current centerline, and the adjustment amount of the roll gap deviation corresponding to the current centerline.

13. The strip mill control method according to any one of claims 1, 4, 5 or 6, characterized in that, Controlling the roll gap of the current frame according to the target roll gap deviation adjustment amount includes: Obtain the traditional roll gap deviation adjustment amount for the current frame; The final roll gap deviation adjustment amount for the current frame is determined based on the conventional roll gap deviation adjustment amount and the target roll gap deviation adjustment amount, so as to control the roll gap of the current frame according to the final roll gap deviation adjustment amount for the current frame.

14. A control device for a strip rolling mill, characterized in that, The device includes: The data acquisition module is used to acquire the current rolling parameter set of the current stand, as well as the current strip hardness field, current strip straightness field, and current strip centerline deviation at the exit of the current stand. The current rolling parameter set includes at least the workpiece thickness at the entrance of the current stand and the workpiece thickness at the exit of the current stand. The information processing module is used to calculate the roll gap deviation adjustment amount by comparing the current strip hardness field, the current strip straightness field, and the current strip centerline deviation with the current rolling parameter set, respectively. This yields the roll gap deviation adjustment amount corresponding to the current hardness, the current straightness, and the current centerline. Based on these adjustments, the target roll gap deviation adjustment amount for the current stand is determined. The method for determining the target roll gap deviation adjustment amount includes determining the target process stage of the current stand according to its position within the rolling mill, and then reading... The control weight coefficients for the target process stage are selected. The target process stage is one of the strip threading stage, rolling stage, and steel polishing stage. The control weight coefficients for the target process stage include the roll gap adjustment weight coefficient corresponding to hardness, the roll gap adjustment weight coefficient corresponding to flatness, and the roll gap adjustment weight coefficient corresponding to centerline. The target roll gap deviation adjustment amount is obtained by weighted calculation based on the current roll gap deviation adjustment amount corresponding to hardness, the current roll gap deviation adjustment amount corresponding to flatness, and the current roll gap deviation adjustment amount corresponding to centerline. An execution module is used to control the roll gap of the current frame via control commands, wherein the control commands are generated based on the target roll gap deviation adjustment amount.

15. An electronic device, characterized in that, The electronic device includes: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the strip mill control method as described in any one of claims 1-13.

16. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by the computer's processor, causes the computer to perform the strip mill control method as described in any one of claims 1-13.

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