A strip tail deviation correction control method in hot rolling finishing mill and related products

Abstract

The present application discloses a method for controlling the deviation of the tail of a strip in a hot rolling finishing mill and related products, and relates to the technical field of cold rolling processes in the metallurgical industry. The method comprises: in the finishing process of hot-rolled strip, obtaining the rolling force deviation reference of the current frame and the real-time rolling force deviation of the current frame; wherein the current frame is the rear frame in the finishing mill; according to the real-time rolling force deviation and the rolling force deviation reference, obtaining the target rolling force deviation of the current frame; and correcting the deviation of the tail of the strip in the current frame by the target rolling force deviation. The present application realizes the deviation correction of the tail of the strip by calculating the rolling force deviation when the rear frame of the finishing mill is rolling the strip.

Description

Technical Field

[0001] The present application relates to the technical field of cold rolling process in the metallurgical industry, and in particular to a method for controlling the deviation of the tail of a strip in a hot rolling finishing mill and related products. Background Art

[0002] In the hot rolling production line, the problem of strip deviation in the finishing rolling stand has always troubled production. Strip deviation can cause failures such as scrap steel, puncture and tail swinging, which not only affects production efficiency, but also increases the operator's intervention in the plate shape, increases labor intensity, and reduces the degree of automation of the production line.

[0003] At present, the strip deviation control technology in the finishing mill is a new AI technology for domestic hot rolling production lines. It is in the exploration and research and development stage, and there is no unified and standardized technical standard. Each company selects different detection equipment and develops corresponding control functions according to the characteristics of its own production line, and the actual effects vary. However, each company relies solely on detecting the deviation between the center line of the strip and the rolling center line to control the strip deviation between the entire finishing mill. However, the control method that relies solely on detecting the deviation between the center line of the strip and the rolling center line cannot perfectly realize the correction of the tail of the strip when the rear section of the finishing mill is rolling the strip.

[0004] Therefore, it is necessary to propose a strip tail correction control method in a hot rolling finishing mill to supplement the control method that simply relies on detecting the deviation between the strip center line and the rolling center line to solve the problem of strip tail correction control in the rear section of the finishing mill. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In a first aspect, the present application proposes a method for controlling the deviation of the tail of a strip in a hot rolling finishing mill, comprising:

[0007] In a finishing rolling process of a hot-rolled steel strip, a rolling force deviation reference of a current stand and a real-time rolling force deviation of the current stand are obtained; wherein the current stand is a rear-stage stand in a finishing mill;

[0008] Obtaining a target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference;

[0009] The tail of the strip in the current stand is corrected by the target rolling force deviation.

[0010] In a feasible implementation manner, the step of obtaining the rolling force deviation reference of the current stand includes:

[0011] When the target rack starts to throw steel, the rolling force deviation of the current rack is collected at a preset time interval to obtain multiple initial rolling force deviations of the current rack; wherein the target rack is the second rack before the current rack;

[0012] Performing data processing on the multiple initial rolling force deviations to obtain multiple processed rolling force deviations;

[0013] An average value is taken for the plurality of rolling force deviations after the processing to obtain a rolling force deviation reference of the current stand.

[0014] In a feasible implementation manner, the data processing of the multiple initial rolling force deviations to obtain multiple processed rolling force deviations includes:

[0015] The multiple initial rolling force deviations are subjected to low-pass filtering according to a preset time period to obtain multiple processed rolling force deviations.

[0016] In a feasible implementation manner, obtaining the target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference includes:

[0017] According to the real-time rolling force deviation, the rolling force deviation reference and a first preset formula, the target rolling force deviation of the current stand is obtained, wherein the first preset formula is:

[0018] FORCE_ERR=FORCE_DIFF-FORCE_DIFF_MEAN;

[0019] Among them, FORCE_ERR is the target rolling force deviation of the current stand, FORCE_DIFF is the real-time rolling force deviation of the current stand, and FORCE_DIFF_MEAN is the rolling force deviation benchmark of the current stand.

[0020] In a feasible implementation manner, the step of correcting the tail of the strip in the current stand by using the target rolling force deviation includes:

[0021] Based on the target rolling force deviation, determining the deviation direction of the strip in the current stand;

[0022] According to the target rolling force deviation, obtaining the deviation correction adjustment amount of the strip steel in the current stand;

[0023] Based on the hydraulic hold-down system, the tail of the strip in the current rack is corrected by the correction adjustment amount and the deviation direction.

[0024] In a feasible implementation manner, the step of determining the deviation direction of the current steel strip based on the target rolling force deviation includes:

[0025] When the target rolling force deviation is a positive number, it is determined that the strip steel in the current stand deviates in a direction that increases the rolling force of the current stand;

[0026] When the target rolling force deviation is a negative number, it is determined that the strip steel in the current stand deviates in a direction that reduces the rolling force of the current stand.

[0027] In a feasible implementation manner, obtaining the deviation correction adjustment amount of the strip steel in the current stand according to the target rolling force deviation includes:

[0028] According to the target rolling force deviation and the second preset formula, the deviation correction adjustment amount of the strip in the current stand is obtained, wherein the second preset formula is:

[0029] △Gap=FORCE_ERR×Hgain×Wgain×K×A÷W;

[0030] Among them, △Gap is the correction adjustment amount of the current strip, FORCE_ERR is the target rolling force deviation of the current frame, Hgain is the thickness change influencing factor of the current strip, Wgain is the width change influencing factor of the current strip, K is the frame stiffness of the current frame, A is the weight factor, and W is the width of the current strip.

[0031] In a second aspect, the present application proposes a device for correcting the tail of a strip in a hot rolling finishing mill, which is applied to the method for correcting the tail of a strip in a hot rolling finishing mill described in any one of the above embodiments, comprising:

[0032] A deviation reference calculation unit, used for obtaining a rolling force deviation reference of a current stand and a real-time rolling force deviation of the current stand in a finishing rolling process of a hot-rolled steel strip; wherein the current stand is a rear-stage stand in a finishing mill;

[0033] a deviation calculation unit, configured to obtain a target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference;

[0034] A deviation correction unit is used to correct the tail of the strip in the current stand through the target rolling force deviation.

[0035] In a third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of the strip tail deviation correction control method in a hot rolling finishing mill as described in any one of the first aspects above when executing the computer program stored in the memory.

[0036] In a fourth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the strip tail correction control method in a hot rolling finishing mill according to any one of the first aspects.

[0037] In summary, the hot rolling finishing mill tail deviation correction control method proposed in this application is aimed at the control method of strip tail deviation correction that simply relies on detecting the deviation between the strip centerline and the rolling centerline. It adds a new rolling force deviation correction control at the tail of the finishing mill rear frame to compensate for it. The redundant detection end misdetection and miscontrol make the strip tail rolling more stable and reduce the failures such as rolling breakage, rolling breakage and tail swinging. That is, by correcting the tail of the strip in the rear frame of the finishing mill, the strip tail rolling is more stable and the failures such as rolling breakage, rolling breakage and tail swinging are reduced.

[0038] The present application proposes a method for controlling the tail deviation of a strip in a hot rolling finishing mill. Other advantages, objectives and features of the present application will be partially reflected through the following description, and will also be partially understood by technicians in this field through research and practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of the process of a method for controlling the deviation of the tail of a strip in a hot rolling finishing mill provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a strip tail deviation correction control device in a hot rolling finishing mill provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the structure of a controller in a strip tail deviation correction control device in a hot rolling finishing mill provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the structure of an electronic device for strip tail deviation correction control in a hot rolling finishing mill provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0045] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0046] See also Figure 1 , which is a schematic flow diagram of a method for controlling the tail deviation of a strip in a hot rolling finishing mill provided in an embodiment of the present application, and may specifically include:

[0047] S110. In the finishing process of the hot-rolled strip, a rolling force deviation reference and a real-time rolling force deviation of the current stand are obtained; wherein the current stand is a rear stand in the finishing mill.

[0048] S120. Obtain a target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation benchmark.

[0049] S130, correcting the tail of the strip in the current stand by using the target rolling force deviation.

[0050] For example, in the finishing process of hot-rolled strip, the finishing mill usually includes seven frames from F1 to F7. Among them, the three frames F5, F6, and F7 are the rear frames in the finishing mill. When the three frames F5, F6, and F7 are rolling the strip, the strip is thinner and the speed is faster, and it is more likely to have faults such as strip tail swinging and breaking. In response to this phenomenon, the present application obtains the rolling force deviation benchmark of the current frame and the real-time rolling force deviation of the current frame, and obtains the target rolling force deviation of the current frame according to the real-time rolling force deviation and the rolling force deviation benchmark, so as to realize the correction of the tail of the strip in the current frame through the target rolling force deviation, so as to reduce the strip breaking, breaking, tail swinging and other faults.

[0051] In some examples, obtaining a rolling force deviation reference of a current stand includes:

[0052] When the target rack starts to throw steel, the rolling force deviation of the current rack is collected at a preset time interval to obtain multiple initial rolling force deviations of the current rack; wherein the target rack is the second rack before the current rack;

[0053] Performing data processing on the multiple initial rolling force deviations to obtain multiple processed rolling force deviations;

[0054] The average value of the processed multiple rolling force deviations is taken to obtain the rolling force deviation benchmark of the current stand.

[0055] Exemplarily, the number F(N) of the current rack is obtained to facilitate subsequent data collection and analysis for the rack. When the rack with the target rack number F(N-2) completes the steel throwing action, the real-time rolling force deviation collection operation of the current rack is triggered. Specifically, the preset time interval is set to 0.2 seconds, that is, the rolling force deviation of the current rack is collected every 0.2 seconds, and finally multiple initial rolling force deviations FORCE_DIFF of the current rack are collected. Among them, the initial rolling force deviation FORCE_DIFF is the rolling force deviation collected in real time, which is obtained by subtracting the rolling force FORCE (OS) on the operating side of the rack from the rolling force FORCE (DS) on the transmission side of the rack. The initial rolling force deviation FORCE_DIFF can be obtained.

[0056] Then, the obtained multiple initial rolling force deviations FORCE_DIFF are subjected to low-pass filtering to obtain multiple processed rolling force deviations, and an average value of 10 of the processed rolling force deviations is obtained, and the average value is used as the rolling force deviation benchmark FORCE_DIFF_MEAN of the current stand.

[0057] In some examples, data processing is performed on a plurality of initial rolling force deviations to obtain a plurality of processed rolling force deviations, including:

[0058] The multiple initial rolling force deviations are subjected to low-pass filtering according to a preset time period to obtain multiple processed rolling force deviations.

[0059] Exemplarily, after obtaining multiple initial rolling force deviations FORCE_DIFF of the current stand, the initial rolling force deviations FORCE_DIFF calculated in real time are low-pass filtered, and the processing time period is 0.2 seconds. Specifically, the measurement error of the rolling force can be reduced by low-pass filtering, because in the actual strip production process, the measured rolling force may be affected by various interference factors and fluctuate, and these fluctuations can be smoothed by low-pass filtering, making the collected data more stable. This avoids excessive rolling force changes in subsequent calculations. Excessive changes may lead to wrong judgments and correction decisions, affecting the stability and quality of strip production.

[0060] In some examples, the target rolling force deviation of the current stand is obtained according to the real-time rolling force deviation and the rolling force deviation benchmark, including:

[0061] According to the real-time rolling force deviation, the rolling force deviation reference and the first preset formula, the target rolling force deviation of the current stand is obtained, wherein the first preset formula is:

[0062] FORCE_ERR=FORCE_DIFF-FORCE_DIFF_MEAN;

[0063] Among them, FORCE_ERR is the target rolling force deviation of the current stand, FORCE_DIFF is the real-time rolling force deviation of the current stand, and FORCE_DIFF_MEAN is the rolling force deviation benchmark of the current stand.

[0064] For example, the current position of the strip during rolling is locked by the rolling force deviation benchmark FORCE_DIFF_MEAN. Specifically, the rolling force deviation benchmark can reflect the normal rolling force deviation under a specific production state. When the strip is in the rolling process, the current position of the strip can be roughly determined by comparing it with the rolling force deviation benchmark. Because if the real-time rolling force deviation of the current stand is significantly different from the rolling force deviation benchmark, it means that the position of the strip may have changed.

[0065] Specifically, the real-time rolling force deviation FORCE_DIFF of the current stand is subtracted from the rolling force deviation reference FORCE_DIFF_MEAN to obtain the target rolling force deviation FORCE_ERR of the current stand.

[0066] In some examples, the tail of the strip in the current stand is corrected by a target rolling force deviation, including:

[0067] Based on the target rolling force deviation, the deviation direction of the strip in the current stand is determined;

[0068] According to the target rolling force deviation, the deviation correction adjustment amount of the strip in the current stand is obtained;

[0069] Based on the hydraulic hold-down system, the tail of the strip in the current rack is corrected by the correction adjustment amount and the deviation direction.

[0070] Exemplarily, firstly, based on the target rolling force deviation, the deviation direction of the strip in the current frame is determined. After the deviation direction of the strip is determined, the target rolling force deviation is converted into a correction adjustment amount, and this correction adjustment amount is used as a given value of the hydraulic down-pressing system HSD. The hydraulic down-pressing system calculates a corresponding correction adjustment amount through the correction adjustment amount and the deviation direction. Through the correction adjustment amount, the roll gap and other parameters of the frame can be adjusted to change the force condition of the strip, thereby correcting the tail of the strip. Specifically, the change of rolling force will cause the change of the roll gap. By analyzing the correction adjustment amount, it can be determined how much the roll gap needs to be adjusted to return the strip to the correct position. For example, if the strip deviates to the left, the correction adjustment amount calculated by the hydraulic down-pressing system controls the left roll gap of the frame to decrease or the right roll gap to increase, thereby correcting the tail of the strip and returning it to the correct position.

[0071] In some examples, based on the target rolling force deviation, the deviation direction of the current strip is determined, including:

[0072] When the target rolling force deviation is a positive number, it is determined that the strip in the current stand deviates in a direction that increases the rolling force of the current stand;

[0073] When the target rolling force deviation is a negative number, it is determined that the strip in the current stand deviates in a direction that reduces the rolling force of the current stand.

[0074] For example, if the target rolling force deviation is a positive number, it means that the real-time rolling force deviation of the current stand is larger than the rolling force deviation benchmark, which means that the strip deviates in the direction of increasing the rolling force of the current stand; if the target rolling force deviation is a negative number, it means that the real-time rolling force deviation of the current stand is smaller than the rolling force deviation benchmark, which means that the strip deviates in the direction of reducing the rolling force of the current stand.

[0075] In some examples, according to the target rolling force deviation, the deviation correction adjustment amount of the strip in the current stand is obtained, including:

[0076] According to the target rolling force deviation and the second preset formula, the deviation correction adjustment amount of the strip in the current stand is obtained, wherein the second preset formula is:

[0077] △Gap=FORCE_ERR×Hgain×Wgain×K×A÷W;

[0078] Among them, △Gap is the correction adjustment amount of the current strip, FORCE_ERR is the target rolling force deviation of the current stand, Hgain is the influencing factor of the thickness change of the current strip, Wgain is the influencing factor of the width change of the current strip, K is the stand stiffness of the current stand, A is the weight factor, and W is the width of the current strip.

[0079] Exemplarily, the contact surface between the steel strip and the roller is affected by multiple factors, including roller diameter, thickness and width of the steel strip, etc. Without considering the influence of the roller diameter, the influence factor of the thickness change of the current steel strip is set as Hgain, and the influence factor of the width change of the current steel strip is set as Wgain, so as to calculate the deviation correction adjustment amount of the current steel strip according to the second preset formula, so as to realize the deviation correction of the tail of the steel strip in the current frame through the deviation correction adjustment amount.

[0080] In summary, the present application proposes a method for correcting the tail of the strip in a hot rolling finishing mill. When the strip is rolled in the rear frame of the finishing mill, the correction control of the tail of the strip is achieved by calculating the rolling force deviation, thereby reducing faults such as strip breakage, breaking, and tail swinging.

[0081] It should be noted that the above embodiments are only the best examples and are not limitations on the implementation methods of the present application.

[0082] Based on the same application concept, the embodiment of the present application also provides a strip tail correction control device in a hot rolling finishing mill corresponding to the strip tail correction control method in a hot rolling finishing mill provided in the above embodiment. Since the principle of solving the problem by the strip tail correction control device in the hot rolling finishing mill in the embodiment of the present application is similar to the strip tail correction control method in the hot rolling finishing mill in the above embodiment of the present application, the implementation of the strip tail correction control device in the hot rolling finishing mill can refer to the implementation of the strip tail correction control method in the hot rolling finishing mill, and the repeated parts will not be repeated.

[0083] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a strip tail deviation correction control device in a hot rolling finishing mill provided in the present application, the device comprising:

[0084] The deviation reference calculation unit 21 is used to obtain the rolling force deviation reference and the real-time rolling force deviation of the current stand in the finishing rolling process of the hot-rolled strip; wherein the current stand is the rear stand in the finishing mill;

[0085] The deviation calculation unit 22 is used to obtain the target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference;

[0086] The deviation correction unit 23 is used to correct the tail of the strip in the current stand through the target rolling force deviation.

[0087] For example, the present application provides a strip tail deviation correction control device in a hot rolling mill, which controls the deviation reference calculation unit 21, the deviation calculation unit 22 and the correction unit 23 through a controller, thereby completing the strip tail deviation correction operation. Figure 3 As shown, Figure 3 The difference between the real-time rolling force deviation and the rolling force deviation benchmark is calculated and output by the subtractor SUB. The limiter LIMIT limits the difference output by SUB to a certain range (i.e., sets the upper quality limit QUL and the lower quality limit QLL) to avoid the signal being too large or too small. The algorithm module further processes or calculates the difference after the LIMIT limit processing. The multiplier MUL completes the multiplication operation of the output from the algorithm module and the KP gain and weight factor A. The ramp generator converts the signal output by MUL into a signal that changes linearly with time to control the dynamic response of the entire device. The HSD position controller adjusts the position state of the controlled object according to the signal output by the ramp generator, thereby achieving precise control of the rolling force and completing the tail deviation correction of the strip.

[0088] In summary, the strip tail deviation correction control device in the hot rolling finishing mill provided in the present application realizes the deviation correction control of the strip tail by calculating the rolling force deviation, thereby reducing strip breakage, breaking, tail swinging and other faults.

[0089] like Figure 4 As shown, based on the same application concept, the embodiment of the present application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor, and when the processor 320 executes the computer program 311, the steps of any method of strip tail correction control in the above-mentioned hot rolling finishing mill are implemented.

[0090] Since the electronic device introduced in this embodiment is a device used to implement a method for correcting the tail end of a strip in a hot rolling finishing mill in the embodiment of the present application, based on the method introduced in the embodiment of the present application, technical personnel in this field can understand the specific implementation mode of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of the present application is not introduced in detail here. As long as the equipment used by technical personnel in this field to implement the method in the embodiment of the present application is within the scope of protection of this application.

[0091] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0092] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0093] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0095] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of the strip tail correction control method in a hot rolling finishing mill in the corresponding embodiment.

[0096] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)), etc.

[0097] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0098] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0099] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0100] In addition, each functional unit in each embodiment of the present application can be integrated into a processing module, each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules.

[0101] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0103] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0104] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A method for controlling the deviation of the tail of a strip in a hot rolling finishing mill, characterized in that: include: In a finishing rolling process of a hot-rolled steel strip, a rolling force deviation reference of a current stand and a real-time rolling force deviation of the current stand are obtained; wherein the current stand is a rear-stage stand in a finishing mill; Obtaining a target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference; The tail of the strip in the current stand is corrected by the target rolling force deviation.

2. The method for controlling the tail deviation of a strip in a hot rolling finishing mill according to claim 1, characterized in that: The step of obtaining the rolling force deviation benchmark of the current stand includes: When the target rack starts to throw steel, the rolling force deviation of the current rack is collected at a preset time interval to obtain multiple initial rolling force deviations of the current rack; wherein the target rack is the second rack before the current rack; Performing data processing on the multiple initial rolling force deviations to obtain multiple processed rolling force deviations; An average value is taken for the plurality of rolling force deviations after the processing to obtain a rolling force deviation reference of the current stand.

3. The method for controlling the tail deviation of a strip in a hot rolling finishing mill according to claim 2, characterized in that: The step of performing data processing on the multiple initial rolling force deviations to obtain multiple processed rolling force deviations includes: The multiple initial rolling force deviations are subjected to low-pass filtering according to a preset time period to obtain multiple processed rolling force deviations.

4. The method for controlling the tail deviation of a strip in a hot rolling finishing mill according to claim 1, characterized in that: The step of obtaining the target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference includes: According to the real-time rolling force deviation, the rolling force deviation reference and a first preset formula, the target rolling force deviation of the current stand is obtained, wherein the first preset formula is: FORCE_ERR=FORCE_DIFF-FORCE_DIFF_MEAN; Among them, FORCE_ERR is the target rolling force deviation of the current stand, FORCE_DIFF is the real-time rolling force deviation of the current stand, and FORCE_DIFF_MEAN is the rolling force deviation benchmark of the current stand.

5. The method for controlling the tail deviation of a strip in a hot rolling finishing mill according to claim 1, characterized in that: The step of correcting the tail of the strip in the current stand by using the target rolling force deviation includes: Based on the target rolling force deviation, determining the deviation direction of the strip in the current stand; According to the target rolling force deviation, obtaining the deviation correction adjustment amount of the strip steel in the current stand; Based on the hydraulic hold-down system, the tail of the strip in the current rack is corrected by the correction adjustment amount and the deviation direction.

6. The strip tail deviation correction control method in a hot rolling finishing mill according to claim 5, characterized in that: The step of determining the deviation direction of the current steel strip based on the target rolling force deviation includes: When the target rolling force deviation is a positive number, it is determined that the strip steel in the current stand deviates in a direction that increases the rolling force of the current stand; When the target rolling force deviation is a negative number, it is determined that the strip steel in the current stand deviates in a direction that reduces the rolling force of the current stand.

7. The method for controlling the deviation of the tail of a strip in a hot rolling finishing mill according to claim 5, characterized in that: The step of obtaining the deviation correction adjustment amount of the strip steel in the current stand according to the target rolling force deviation comprises: According to the target rolling force deviation and the second preset formula, the deviation correction adjustment amount of the strip in the current stand is obtained, wherein the second preset formula is: △Gap=FORCE_ERR×Hgain×Wgain×K×A÷W; Among them, △Gap is the correction adjustment amount of the current strip, FORCE_ERR is the target rolling force deviation of the current frame, Hgain is the thickness change influencing factor of the current strip, Wgain is the width change influencing factor of the current strip, K is the frame stiffness of the current frame, A is the weight factor, and W is the width of the current strip.

8. A device for correcting the tail deviation of a strip in a hot rolling finishing mill, applied to the method for correcting the tail deviation of a strip in a hot rolling finishing mill as claimed in any one of claims 1 to 7, characterized in that: include: A deviation reference calculation unit, used for obtaining a rolling force deviation reference of a current stand and a real-time rolling force deviation of the current stand in a finishing rolling process of a hot-rolled steel strip; wherein the current stand is a rear-stage stand in a finishing mill; a deviation calculation unit, configured to obtain a target rolling force deviation of the current stand according to the real-time rolling force deviation and the rolling force deviation reference; A deviation correction unit is used to correct the tail of the strip in the current stand through the target rolling force deviation.

9. An electronic device, comprising: A memory and a processor, characterized in that the processor is used to implement the steps of the strip tail correction control method in a hot rolling finishing mill as described in any one of claims 1 to 7 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the strip tail deviation correction control method in a hot rolling finishing mill as described in any one of claims 1 to 7 are implemented.

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