Method, device, medium and continuous rolling train for preventing strip steel from deviating

Abstract

This application relates to the field of strip steel production control technology, and discloses a method, device, medium, and continuous rolling mill for preventing strip steel deviation. The method includes: real-time acquisition of the strip steel tension values ​​on the drive side and the operating side at the exit of the last rolling mill; calculating the difference between the drive side tension value and the operating side tension value and storing the difference as the strip steel tension difference; obtaining an upper limit and a lower limit for the strip steel tension difference, wherein the strip steel tension difference should be greater than the lower limit and less than the upper limit; if the strip steel tension difference is greater than the upper limit, reducing the roll gap on the drive side of the last rolling mill until the strip steel tension difference is less than the upper limit; if the strip steel tension difference is less than the lower limit, reducing the roll gap on the operating side of the last rolling mill until the strip steel tension difference is greater than the lower limit. This application can prevent strip steel deviation in continuous annealing units and improve the safety of strip steel production.

Description

Technical Field

[0001] This application relates to the field of strip steel production control technology, and in particular to a method, device, medium and continuous rolling mill for preventing strip steel deviation. Background Technology

[0002] Cold-rolled steel strip is characterized by its smooth surface and high dimensional accuracy, and is widely used in industries such as automobiles, home appliances, and construction. In the production process of cold-rolled steel strip, strip misalignment is a common production problem in continuous annealing units. Slight misalignment may cause the unit to slow down and affect production efficiency, while severe misalignment may cause serious accidents such as strip edge scraping and strip breakage, forcing the unit to shut down. Summary of the Invention

[0003] The purpose of this application is to provide a method, device, medium, and continuous rolling mill for preventing strip steel deviation. This application can take certain deviation control measures when the strip steel is produced in the continuous rolling mill, so as to prevent the strip steel from deviating during the continuous annealing mill production, thereby improving the safety of the strip steel during the continuous annealing mill production.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0005] According to one aspect of the embodiments of this application, a method for preventing strip steel deviation is provided. The method includes: acquiring the tension value of the strip steel on the drive side and the tension value of the strip steel on the operating side at the exit of the last rolling mill in real time; calculating the difference between the tension value on the drive side and the tension value on the operating side and storing the difference as the strip steel tension difference; acquiring an upper limit value and a lower limit value of the strip steel tension difference, wherein the strip steel tension difference should be greater than the lower limit value and less than the upper limit value; if the strip steel tension difference is greater than the upper limit value, then reducing the roll gap on the drive side of the last rolling mill until the strip steel tension difference is less than the upper limit value; if the strip steel tension difference is less than the lower limit value, then reducing the roll gap on the operating side of the last rolling mill until the strip steel tension difference is greater than the lower limit value.

[0006] In one embodiment of this application, based on the aforementioned scheme, the reduction of the roll gap on the strip drive side of the last rolling mill includes: outputting a first roll gap compensation command to reduce the roll gap on the strip drive side of the last rolling mill based on the strip tension difference being greater than the upper limit of the tension difference; based on the first roll gap compensation command, the tilting roll control system controls the work roll of the last rolling mill to tilt towards the strip drive side until the strip tension difference is less than the upper limit of the tension difference.

[0007] In one embodiment of this application, based on the aforementioned scheme, the reduction of the roll gap on the strip operating side of the last rolling mill includes: outputting a second roll gap compensation command to reduce the roll gap on the strip operating side of the last rolling mill based on the strip tension difference being less than the lower limit of the tension difference; based on the second roll gap compensation command, the tilting roll control system controls the work roll of the last rolling mill to tilt towards the strip operating side until the strip tension difference is greater than the lower limit of the tension difference.

[0008] In one embodiment of this application, based on the aforementioned scheme, before the tilting roller control system controls the work roller to tilt, it further includes: setting the gain coefficient of the tilting roller control system, wherein the gain coefficient characterizes the response processing speed of the tilting roller control system per unit time.

[0009] In one embodiment of this application, based on the aforementioned scheme, before the tilting control system controls the work roll to tilt, it further includes: setting a tilting limit value for the work roll, wherein the tilting limit value characterizes the maximum tilting amplitude of the work roll.

[0010] In one embodiment of this application, based on the foregoing scheme, before obtaining the upper limit value and lower limit value of the tension difference of the strip steel, the method further includes: setting the upper limit value of the tension difference of the strip steel and the lower limit value of the tension value.

[0011] In one embodiment of this application, based on the aforementioned scheme, when setting the upper limit value of the tension difference and the lower limit value of the tension value of the strip, the upper limit value of the tension difference is 2.5kN and the lower limit value of the tension difference is 1.5kN when the strip width is >1400mm; when the strip width is ≤1400mm, the upper limit value of the tension difference is 2kN and the lower limit value of the tension difference is 1kN.

[0012] According to one aspect of the embodiments of this application, an apparatus for preventing strip deviation is provided. The apparatus includes: an acquisition unit, configured to acquire in real time the tension value of the strip on the drive side and the tension value of the strip on the operating side at the exit of the last rolling mill, calculate the difference between the tension value on the drive side and the tension value on the operating side and save the difference as the strip tension difference, and acquire an upper limit value and a lower limit value of the strip tension difference, wherein the strip tension difference should be greater than the lower limit value and less than the upper limit value; a first control unit, configured to reduce the roll gap on the drive side of the last rolling mill when the strip tension difference is greater than the upper limit value, until the strip tension difference is less than the upper limit value; and a second control unit, configured to reduce the roll gap on the operating side of the last rolling mill when the strip tension difference is less than the lower limit value, until the strip tension difference is greater than the lower limit value.

[0013] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein at least one piece of program code is stored in the computer-readable storage medium, the at least one piece of program code being loaded and executed by a processor to implement the operations performed by the methods described in the above embodiments.

[0014] According to one aspect of the embodiments of this application, a continuous rolling mill is provided, the continuous rolling mill including one or more processors and one or more memories, the one or more memories storing at least one piece of program code, the at least one piece of program code being loaded and executed by the one or more processors to implement the operations performed by the methods described in the above embodiments.

[0015] In the technical solution of this application embodiment, the tension values ​​of the strip on the drive side and the operating side at the exit of the last rolling mill are obtained. The difference between the tension value on the drive side and the tension value on the operating side is calculated and maintained as the strip tension difference. An upper limit and a lower limit of the strip tension difference are obtained. If the strip tension value is greater than the lower limit but less than the upper limit, it indicates that the forces on the drive side and the operating side are balanced, and the probability of deviation is low. If the strip tension difference is greater than the upper limit, the roll gap on the drive side of the last rolling mill is reduced, and the rolling force on the drive side is changed, thereby changing the tension value on the drive side until the strip tension difference is less than the upper limit. If the strip tension difference is less than the lower limit, the roll gap on the operating side of the last rolling mill is reduced, and the rolling force on the operating side is changed, thereby changing the tension value on the operating side until the strip tension difference is greater than the lower limit. By maintaining the tension balance between the strip drive side and the strip operating side, the forces on the strip drive side and the operating side are balanced. When the strip is under balanced forces, it can travel along the predetermined route, which improves the quality of the strip after rolling in the continuous rolling mill and makes it less likely for the strip to deviate during production in the continuous annealing unit, thus preventing the strip from deviating in the continuous annealing unit.

[0016] 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

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating a method for preventing strip misalignment according to an embodiment of this application;

[0019] Figure 2 This is a detailed flowchart illustrating the reduction of the roll gap on the strip drive side of the final rolling mill according to an embodiment of this application;

[0020] Figure 3This is a detailed flowchart illustrating the reduction of the roll gap on the operating side of the strip mill in accordance with an embodiment of this application;

[0021] Figure 4 This is a block diagram illustrating a device for preventing strip misalignment according to an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of a computer-readable storage medium according to an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of a continuous rolling mill unit according to an embodiment of this application. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0025] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0026] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0027] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0028] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0030] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0031] First, it should be noted that the method for preventing strip steel deviation proposed in this application can be applied to the field of strip steel production control technology. For example, when strip steel is produced in a continuous annealing unit, the strip steel moves in a preset direction of travel. If the strip steel deviates significantly, it will seriously affect the production quality of the strip steel and the production safety of the production equipment. Therefore, preventing strip steel deviation is particularly important when producing strip steel in a continuous annealing unit.

[0032] According to one aspect of this application, a method for preventing strip misalignment is provided. Figure 1 The flowchart below illustrates a method for preventing strip steel deviation according to an embodiment of this application. This method can be executed by a device with computational processing capabilities. The method for adjusting the angle of a vehicle rearview mirror includes at least steps 110 to 130, detailed below:

[0033] Please refer to Figure 1 Step 110: Real-time acquisition of the tension value of the strip on the drive side and the tension value of the strip on the operating side at the exit of the last rolling mill; calculation of the difference between the tension value on the drive side and the tension value on the operating side and saving the difference as the strip tension difference; acquisition of the upper limit and lower limit of the strip tension difference; the strip tension difference should be greater than the lower limit and less than the upper limit.

[0034] Step 120: If the strip tension difference is greater than the upper limit of the tension difference, then reduce the roll gap on the strip drive side of the last rolling mill until the strip tension difference is less than the upper limit of the tension difference.

[0035] Step 130: If the strip tension difference is less than the lower limit of the tension difference, then reduce the roll gap on the strip operating side of the last mill until the strip tension difference is greater than the lower limit of the tension difference.

[0036] In this application, the tension values ​​of the strip on the drive side and the tension values ​​of the strip on the operating side at the exit of the last rolling mill are acquired in real time. If the strip tends to deviate in the continuous rolling mill, the tension difference of the strip at the exit of the last rolling mill will be significantly exceeded. If the tension difference of the strip at the exit of the last rolling mill is not exceeded, the strip is running stably.

[0037] Calculate the difference between the tension value on the drive side and the tension value on the operating side of the strip, and save the difference as the strip tension difference. The calculation formula is: ΔT=T(DS)-T(OS), where ΔT is the strip tension difference, T(DS) is the tension value on the drive side of the strip, and T(OS) is the tension value on the operating side of the strip.

[0038] The uneven tension on both sides of the strip's width direction causes asymmetric traction tension during continuous rolling mill production due to internal stress. This results in a deflection force along the strip's width direction. When this deflection force exceeds the friction between the strip and the contact roll system, the strip will deviate towards the relatively looser side. This phenomenon is particularly pronounced when the strip has an asymmetrical shape. Strip tension difference is a key indicator for evaluating the symmetry of the strip shape. Maintaining the strip tension difference within a preset range, and keeping the deflection force in the strip's width direction (i.e., the drive side and the operating side) within a preset range, while ensuring the deflection force is less than the friction between the strip and the contact roll system, minimizes the probability of strip deviation. This effectively prevents strip deviation, improves strip quality after continuous rolling, and ensures the strip maintains a good travel path when transported to the continuous annealing unit, further preventing deviation during continuous annealing.

[0039] If the strip tension difference exceeds the upper limit, the roll gap on the strip drive side of the last mill is reduced, changing the rolling force on the strip drive side, thereby altering the tension value on the strip drive side until the strip tension difference is less than the upper limit. If the strip tension difference is less than the lower limit, the roll gap on the strip operating side of the last mill is reduced, changing the rolling force on the strip operating side, thereby altering the tension value on the strip operating side until the strip tension difference exceeds the lower limit. By maintaining tension balance on the strip drive side and the strip operating side, the forces on the strip drive side and the operating side are balanced. Balanced forces allow the strip to travel along the predetermined path, preventing strip deviation.

[0040] In one embodiment of this application, reducing the roll gap on the strip drive side of the last rolling mill can be achieved as follows: Figure 2 Perform the steps shown.

[0041] Please refer to Figure 2 , Figure 2 The following is a detailed flowchart illustrating the reduction of the roll gap on the strip drive side of the final rolling mill according to an embodiment of this application, specifically including steps 121 to 122:

[0042] Step 121: Output the first roll gap compensation command to reduce the roll gap on the strip drive side of the last rolling mill, based on the fact that the strip tension difference is greater than the upper limit of the tension difference.

[0043] Step 122: According to the first roll gap compensation command, the tilting roll control system controls the work roll of the last rolling mill to tilt towards the strip drive side until the strip tension difference is less than the upper limit of the tension difference.

[0044] In this application, a first roll gap compensation command is output to reduce the roll gap on the strip drive side of the last rolling mill based on the strip tension difference being greater than the upper limit of the tension difference. Based on the first roll gap compensation command, the tilting roll control system controls the work roll of the last rolling mill to tilt towards the strip drive side, thereby reducing the roll gap on the strip drive side of the last rolling mill, changing the tension value on the strip drive side, reducing the tension value on the strip drive side, and decreasing the strip tension difference until it is less than the upper limit of the tension difference.

[0045] In one embodiment of this application, reducing the roll gap on the strip operating side of the last rolling mill can be done according to... Figure 3 Perform the steps shown.

[0046] Please refer to Figure 3 , Figure 3 The following is a detailed flowchart illustrating the reduction of the roll gap on the operating side of the strip mill in accordance with an embodiment of this application, specifically including steps 131 to 132:

[0047] Step 131: Output a second roll gap compensation command to reduce the roll gap on the strip operation side of the last rolling mill, based on the fact that the strip tension difference is less than the lower limit of the tension difference.

[0048] Step 132: According to the second roll gap compensation command, the tilting roll control system controls the work roll of the last mill to tilt towards the strip operating side until the strip tension difference is greater than the lower limit of the tension difference.

[0049] In this application, a second roll gap compensation command is output to reduce the roll gap on the strip operating side of the last mill based on the strip tension difference being less than the lower limit of the tension difference. Based on the second roll gap compensation command, the tilting roll control system controls the work rolls of the last mill to tilt towards the strip operating side, thereby reducing the roll gap on the strip operating side and changing the tension value on the strip operating side. As the tension value on the strip operating side decreases, the strip tension difference increases until it exceeds the lower limit of the tension difference.

[0050] In one embodiment of this application, before the tilting roller control system controls the work roller to tilt, the system further includes step 111, setting the gain coefficient of the tilting roller control system, wherein the gain coefficient characterizes the sensitivity of the tilting roller control system.

[0051] In this application, the gain coefficient can be set between 0.003 and 0.008 to improve the sensitivity of the tilting roll control system and enhance the response speed and processing capacity to the tension difference of the strip.

[0052] In one embodiment of this application, before the tilting control system controls the work roll to tilt, it further includes step 112, setting the tilting limit value of the work roll, wherein the tilting limit value characterizes the maximum tilting amplitude of the work roll.

[0053] In this application, the tilt limit value of the work roll limits the maximum tilt of the work roll, which can effectively ensure that the strip can pass smoothly and change the tension value of the strip drive side or the strip operation side, thereby ensuring the tension value balance of the strip drive side and the strip operation side, thus maintaining the force balance of the strip and enabling the strip to be smoothly transmitted from the predetermined travel path.

[0054] In one embodiment of this application, before obtaining the upper limit value and lower limit value of the tension difference of the strip, the method further includes step 113, which sets the upper limit value of the tension difference and the lower limit value of the tension value of the strip.

[0055] In this application, the upper and lower limits of the tension value of the strip steel need to be set according to the width of the strip steel in order to control the reasonable range of the strip steel offset force.

[0056] In one embodiment of this application, when setting the upper limit value of the tension difference and the lower limit value of the tension value of the strip, the upper limit value of the tension difference is 2.5kN and the lower limit value of the tension difference is 1.5kN when the strip width is >1400mm; when the strip width is ≤1400mm, the upper limit value of the tension difference is 2kN and the lower limit value of the tension difference is 1kN.

[0057] In the application, when the strip width is greater than 1400mm, the upper limit of the tension difference can be set to 2.5kN, and the lower limit can be set to 1.5kN; when the strip width is less than or equal to 1400mm, the upper limit of the tension difference can be set to 2kN, and the lower limit can be set to 1kN. When the strip tension difference is within the set upper and lower limits, the offset force in the strip width direction is less than the frictional force between the strip and the contact roller system, and the strip can maintain its predetermined track travel in the direction of travel, effectively preventing strip deviation.

[0058] In conclusion, during the production process of the strip in the continuous rolling mill, the tension values ​​of the strip drive side and the strip operation side are acquired in real time, and the tension difference of the strip is calculated. The tension difference of the strip should be less than the upper limit of the tension difference and greater than the lower limit of the tension difference. Within this range, the offset force generated by the strip is less than the frictional force between the strip and the contact roll system, and the strip will not deviate. The strip can travel along the predetermined route in the continuous rolling mill, which improves the quality of the strip after the continuous rolling mill, thereby preventing the strip from deviating during the production of the continuous annealing unit.

[0059] The following describes an embodiment of the apparatus described in this application, which can be used to execute the method for preventing strip misalignment in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method for preventing strip misalignment described above in this application.

[0060] Figure 4 A block diagram of a device for preventing strip misalignment according to an embodiment of this application is shown.

[0061] Reference Figure 4 As shown, a device 400 for preventing strip misalignment according to an embodiment of this application includes: an acquisition unit 401, a first control unit 402, and a second control unit 403.

[0062] The acquisition unit 401 is used to acquire the tension values ​​of the strip on the drive side and the operating side at the exit of the last rolling mill in real time, calculate the difference between the tension value on the drive side and the tension value on the operating side, and save the difference as the strip tension difference. It also acquires the upper limit and lower limit of the strip tension difference, wherein the strip tension difference should be greater than the lower limit and less than the upper limit. The first control unit 402 is used to reduce the roll gap on the drive side of the last rolling mill when the strip tension difference is greater than the upper limit until the strip tension difference is less than the upper limit. The second control unit 403 is used to reduce the roll gap on the operating side of the last rolling mill when the strip tension difference is less than the lower limit until the strip tension difference is greater than the lower limit.

[0063] In another aspect, this application also provides a computer-readable storage medium storing a program product capable of implementing the method for preventing strip misalignment described above. In some possible embodiments, various aspects of this application can also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to the various exemplary embodiments of this application.

[0064] refer to Figure 5 As shown, a program product 500 for implementing the above-described method according to an embodiment of this application is described. It may employ a portable compact disc read-only memory (CD-ROM) and include program code, and can run on a terminal device, such as a personal computer. However, the program product of this application is not limited thereto. In this application, the readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0065] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0066] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0067] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0068] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0069] In another respect, this application also provides a continuous rolling mill unit capable of implementing the above-described method.

[0070] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0071] The following reference Figure 6 This application describes a continuous rolling mill 600 according to this embodiment. Figure 6 The continuous rolling mill 600 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0072] like Figure 6 As shown, the continuous rolling mill 600 is represented in the form of a general-purpose computing device. The components of the continuous rolling mill 600 may include, but are not limited to: at least one processing unit 610, at least one storage unit 620, and a bus 630 connecting different system components (including storage unit 620 and processing unit 610).

[0073] The storage unit stores program code that can be executed by the processing unit 610, causing the processing unit 610 to perform the steps described in the "Embodiment Methods" section above according to various exemplary embodiments of this application.

[0074] Storage unit 620 may include readable media in the form of volatile storage units, such as random access memory (RAM) 621 and / or cache memory 622, and may further include read-only memory (ROM) 623.

[0075] Storage unit 620 may also include a program / utility 624 having a set (at least one) of program modules 625, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0076] Bus 630 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0077] The continuous rolling mill 600 can also communicate with one or more external devices 1400 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), one or more devices that enable users to interact with the continuous rolling mill 600, and / or any device that enables the continuous rolling mill 600 to communicate with one or more other computing devices (e.g., routers, modems, etc.). This communication can be performed via input / output (I / O) interface 650. Furthermore, the continuous rolling mill 600 can also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via network adapter 660. As shown, network adapter 660 communicates with other modules of the continuous rolling mill 600 via bus 630. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the continuous rolling mill 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0078] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the method according to the embodiments of this application.

[0079] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0080] It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for preventing strip steel deviation, characterized in that, The method includes: The tension values ​​of the strip on the drive side and the operating side at the exit of the last rolling mill are acquired in real time. The difference between the tension value on the drive side and the tension value on the operating side is calculated and saved as the strip tension difference. The upper limit and lower limit of the strip tension difference are obtained. The strip tension difference should be greater than the lower limit and less than the upper limit. If the strip tension difference is greater than the upper limit of the tension difference, then reduce the roll gap on the strip drive side of the last rolling mill until the strip tension difference is less than the upper limit of the tension difference. If the strip tension difference is less than the lower limit of the tension difference, then reduce the roll gap on the strip operating side of the last mill until the strip tension difference is greater than the lower limit of the tension difference. Before obtaining the upper limit and lower limit of the tension difference of the strip steel, the method further includes: Set the upper limit and lower limit of the tension difference of the strip steel. When the strip steel width is >1400mm, the upper limit of the tension difference is 2.5kN and the lower limit of the tension difference is 1.5kN; when the strip steel width is ≤1400mm, the upper limit of the tension difference is 2kN and the lower limit of the tension difference is 1kN.

2. The method according to claim 1, characterized in that, The reduction of the roll gap on the strip drive side of the final rolling mill includes: The first roll gap compensation command is output to reduce the roll gap on the drive side of the strip in the last rolling mill, based on the fact that the strip tension difference is greater than the upper limit of the tension difference. Based on the first roll gap compensation command, the tilting roll control system controls the work roll of the last mill to tilt towards the strip drive side until the strip tension difference is less than the upper limit of the tension difference.

3. The method according to claim 1, characterized in that, The reduction of the roll gap on the operating side of the strip mill at the end includes: The second roll gap compensation command is output to reduce the roll gap on the operating side of the strip in the last rolling mill, based on the fact that the strip tension difference is less than the lower limit of the tension difference. According to the second roll gap compensation command, the tilting roll control system controls the work roll of the last mill to tilt towards the strip operating side until the strip tension difference is greater than the lower limit of the tension difference.

4. The method according to claim 2 or 3, characterized in that, Before the tilting control system controls the tilting of the work roll, it also includes: Set the gain coefficient of the tilting roller control system, which characterizes the response processing speed of the tilting roller control system per unit time.

5. The method according to claim 2 or 3, characterized in that, Before the tilting control system controls the tilting of the work roll, it also includes: Set the tilt limit value of the work roll, which represents the maximum tilt of the work roll.

6. A device for preventing strip misalignment, characterized in that, The device includes: The acquisition unit is used to acquire the tension values ​​of the strip on the drive side and the operating side at the exit of the last rolling mill in real time, calculate the difference between the tension value on the drive side and the tension value on the operating side, and save the difference as the strip tension difference. It also acquires the upper limit and lower limit of the strip tension difference, wherein the strip tension difference should be greater than the lower limit and less than the upper limit. Before acquiring the upper and lower limits of the strip tension difference, the unit further includes setting the upper and lower limits of the strip tension difference: when the strip width is >1400mm, the upper limit is 2.5kN and the lower limit is 1.5kN; when the strip width is ≤1400mm, the upper limit is 2kN and the lower limit is 1kN. The first control unit is used to reduce the roll gap on the strip drive side of the last mill when the strip tension difference is greater than the upper limit of the tension difference, until the strip tension difference is less than the upper limit of the tension difference. The second control unit is used to reduce the roll gap on the strip operation side of the last mill when the strip tension difference is less than the lower limit of the tension difference, until the strip tension difference is greater than the lower limit of the tension difference.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one piece of program code, which is loaded and executed by a processor to perform the operations performed by the method as described in any one of claims 1 to 5.

8. A continuous rolling mill unit, characterized in that, The continuous rolling mill includes one or more processors and one or more memories, the one or more memories storing at least one piece of program code, which is loaded and executed by the one or more processors to perform the operation as described in any one of claims 1 to 5.

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