A rolling mill control method, device, medium and electronic equipment

Abstract

The application discloses a rolling mill control method, device, medium and electronic equipment. In a multi-pass rolling process of a rolling mill, the maximum linear speed of a driving roller is calculated according to the limit speed of a motor and the diameter of the driving roller, and an adaptive limiting value of the linear speed of the mill train is obtained. In the multi-pass rolling process, the linear speed of the mill train is controlled to be not more than the adaptive limiting value. The application provides a rolling mill control method which can exert the super maximum design limit performance of the equipment and improve the yield without affecting the service life of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical production and processing, and particularly relates to a rolling mill control method, device, medium and electronic equipment. BACKGROUND

[0002] Currently, the maximum linear speed of a rolling mill unit is a fixed value, which is calculated based on the smallest two intermediate transmission rollers. The corresponding motor speed is basically equal to the maximum design speed of the main motor of the rolling mill. In theory, there is no margin space, and the equipment is in an extreme working state. If the limit is changed to directly increase the speed, the running speed of the main motor of the rolling mill will be greater than the maximum design speed. According to the mechanical characteristics of a three-phase asynchronous motor, the overturning torque (maximum allowable torque) of the motor decreases sharply with the increase of the speed (inversely proportional to the square of the speed) when the motor runs at a high speed above the base speed, which will cause abnormal heating of the stator winding of the motor, and in severe cases, the motor will not be able to drag the load and will be abnormally stopped.

[0003] The maximum linear speed of the rolling mill unit is a fixed value, which is calculated based on the smallest two intermediate transmission rollers. When the diameters of the two intermediate transmission rollers are large, the maximum production efficiency of the equipment cannot be achieved, which is a waste of resources. Moreover, the maximum speed of the motor also has room for improvement. SUMMARY

[0004] In view of the above problems, the present application is proposed to provide a rolling mill control method, device, medium and electronic equipment which can overcome the above problems or at least partially solve the above problems.

[0005] In one aspect, a rolling mill control method is provided, which controls the linear speed of a rolling mill unit during multi-pass rolling of the rolling mill, comprising:

[0006] According to the limit speed of the motor and the diameter of the driving roller, the maximum linear speed of the driving roller is calculated to obtain an adaptive limiting value of the linear speed of the unit.

[0007] During the multi-pass rolling process, the linear speed of the unit is controlled to be not greater than the adaptive limiting value.

[0008] Optionally, the control of the linear speed of the rolling mill unit further comprises:

[0009] The first limiting value of the linear speed of the unit is given inside a primary control system of the rolling mill, and a second limiting value of the linear speed of the unit is given by a secondary control system of the rolling mill. The smaller one of the first limiting value and the second limiting value is taken to obtain a fixed limiting value of the linear speed of the unit.

[0010] During the multi-pass rolling process, the linear speed of the unit is controlled to be not greater than the fixed limiting value.

[0011] Optionally, the primary control system is an automation level system, and the input and output of I / O signals are controlled by a controller.

[0012] Optionally, the secondary control system is a process control level system, and the secondary control system includes tracking logic control and model calculation, and the optimization setting calculation of control parameters is realized through a series of mathematical models and control algorithms, and the optimization setting calculation of control parameters is transmitted to the primary control system.

[0013] Optionally, the multi-pass rolling of the rolling mill is six-pass rolling, and the mill line speed is controlled to be not more than the fixed limiting value during the first to third pass rolling, and the mill line speed is controlled to be not more than the adaptive limiting value during the fourth to sixth pass rolling.

[0014] Optionally, the adaptive limiting value of the mill line speed is calculated according to the maximum rotational speed of the motor and the diameter of the driving roller, and the adaptive limiting value of the mill line speed comprises:

[0015] The adaptive limiting value of the mill line speed is calculated by the formula The maximum linear speed of the driving roller is calculated, wherein Vmax is the maximum linear speed of the driving roller, represents the adaptive limiting value of the mill line speed, D is the diameter of the driving roller, Nmax is the maximum rotational speed of the motor, represents the maximum angular speed output by the motor, and Gr is the gear ratio of the speed reducer.

[0016] Optionally, the rolling mill is a 20-high reversible cold rolling mill, and the rolling mill comprises an upper roller set and a lower roller set arranged oppositely and symmetrically, the upper roller set and the lower roller set each comprise 10 rollers, the 10 rollers comprise one work roller, two first intermediate transmission rollers, three second intermediate transmission rollers, and four support rollers, the two first intermediate transmission rollers are in surface contact with the work roller, the three second intermediate transmission rollers are in surface contact with the two first intermediate transmission rollers, and the four support rollers are in surface contact with the three second intermediate transmission rollers, wherein two second intermediate transmission rollers at the edges of the three second intermediate transmission rollers are the driving rollers, the driving rollers are drivingly connected to the output end of the motor through a speed reducer, and the mill line speed is the linear speed of the work roller.

[0017] In a second aspect, a rolling mill control device is provided for controlling the mill line speed of a rolling mill during multi-pass rolling of the rolling mill, and the rolling mill control device comprises:

[0018] A calculation unit is configured to calculate the maximum linear speed of the driving roller according to the maximum rotational speed of the motor and the diameter of the driving roller, and obtain the adaptive limiting value of the mill line speed.

[0019] A control unit is configured to control the mill line speed to be not more than the adaptive limiting value during the multi-pass rolling.

[0020] In a third aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores at least one program code, which is loaded and executed by a processor to implement the rolling mill control method in the first aspect.

[0021] In a fourth aspect, a rolling mill control electronic device is provided, and the electronic device comprises one or more processors and one or more memories, and the one or more memories store at least one program code, which is loaded and executed by the one or more processors to implement the rolling mill control method in the first aspect.

[0022] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0023] The rolling mill control method, device, medium and electronic device provided in the embodiments of the present application use the limit speed of the motor and the diameter of the driven roller to calculate an adaptive maximum mill line speed, so as to realize mill maximum line speed operation; on the basis of the mill reaching the maximum design line speed, and without increasing or changing the hardware device, the speed is safely and scientifically increased, so as to achieve the purpose of playing the device super maximum design limit performance and improving the yield without affecting the device life, thereby further improving the market share and yield.

[0024] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numerals are used throughout the several drawings to represent similar or same components. In the drawings:

[0026] Figure 1 A schematic diagram of a rolling mill control system in the embodiments of the present application is shown;

[0027] Figure 2 A schematic diagram of an existing rolling mill control system is shown;

[0028] Figure 3 A schematic diagram of a 20-roll reversible cold rolling mill roller set is shown;

[0029] Figure 4 A block diagram of a rolling mill control device according to the embodiments of the present application is shown;

[0030] Figure 5 a schematic diagram of a computer readable storage medium according to an embodiment of the present application;

[0031] Figure 6 a schematic diagram of a system structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0033] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and can omit certain details. The shapes of various regions, layers shown in the diagrams, and their relative sizes and positional relationships can deviate in actuality due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes, relative positions can be additionally designed by those skilled in the art according to actual needs.

[0034] In the context of the present disclosure, when a layer / element is referred to as being located "on" another layer / element, the layer / element can be directly on the other layer / element, or there can be an intervening layer / element therebetween. In addition, if a layer / element is located "on" another layer / element in one orientation, it can be located "under" the other layer / element when the orientation is reversed. In the context of the present disclosure, similar or identical components can be indicated by the same or similar reference numerals.

[0035] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with specific embodiments. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0036] The present application provides a rolling mill control method, in the multi-pass rolling process of a rolling mill, the linear speed of the mill train is controlled, comprising: calculating the maximum linear speed of the driving roller according to the limit speed of the motor and the diameter of the driving roller, obtaining the adaptive amplitude limiting value of the linear speed of the mill train; in the multi-pass rolling process, the linear speed of the mill train is controlled to be not more than the adaptive amplitude limiting value.

[0037] The rolling mill exceeds the maximum design limit linear speed rolling, which is restricted by many aspects such as steel type, pass, roller diameter, program parameter, frequency converter and main motor equipment. In order to further improve the production capacity and play the efficiency of the equipment exceeding the maximum design limit, but also must speed up safely under the premise of not affecting the service life.

[0038] The rotational speed given in the rolling mill main motor drive control logic has a first limit and a second limit, both of which are 110% of the highest rotational speed, and the two parameters have no corresponding address reserved, and are fixed in the control board protection, which is strictly prohibited to modify, the purpose of such setting is to protect the motor from running higher than the maximum motor speed, which is designed for the protection of the motor and mechanical equipment, but also indirectly restricts the maximum given frequency of the speed limit; at the same time, the highest running frequency of the rolling mill motor frequency converter hardware is 60Hz, which will also restrict the maximum given frequency of the speed limit. In summary, through the comprehensive evaluation of the rolling mill frequency converter system, the main motor and the air mechanical system, the maximum motor rotational speed exceeding the design limit (1.08 times the maximum motor rotational speed) is determined, and on this basis, the program is developed and optimized, so that the fixed limit value of the original design maximum is optimized into the limit value which changes automatically according to the pass and the diameter of the main roller, and finally the purpose of playing the maximum design limit performance of the equipment and improving the yield without affecting the service life of the equipment is achieved. The motor is the motor of the rolling mill, the main roller is driven by the motor, and the rotational speed of the working roller is used to control the rotational speed of the working roller of the rolling mill, which represents the linear speed of the rolling mill, which is the conventional structure of the rolling mill, and is not repeated here.

[0039] Specifically, the control of the linear speed of the rolling mill also includes: the first limit value of the linear speed of the rolling mill is given in the first control system of the rolling mill, the second limit value of the linear speed of the rolling mill is given in the second control system of the rolling mill, the smaller value of the first limit value and the second limit value is taken as the fixed limit value of the linear speed of the rolling mill; in the multi-pass rolling process, the linear speed of the rolling mill is controlled to be not more than the fixed limit value. In the first few passes of rolling, especially in the first 3 passes of rolling, because the rolling mill motor load current is large, it is more suitable to limit the linear speed of the rolling mill by using the fixed limit value.

[0040] In an optional embodiment, please refer to Figure 1 , Figure 1 is a schematic diagram of the rolling mill control system in the embodiment of the present application, the multi-pass rolling of the rolling mill is 6-pass rolling, in the first to third pass rolling process, the linear speed of the rolling mill is controlled to be not more than the fixed limit value, Figure 1 is represented as ≤3 0; in the fourth to sixth pass rolling process, the linear speed of the rolling mill is controlled to be not more than the adaptive limit value, Figure 1 is represented as pass >3 1.

[0041] Specifically, the adaptive limit value of the linear speed of the main roller is calculated according to the maximum rotational speed of the motor and the diameter of the main roller, which includes: the maximum linear speed of the main roller is calculated by using the formula ; wherein V maxVmax is the maximum linear speed of the driving roll, representing the adaptive limiting value of the mill linear speed, D is the diameter of the driving roll, N is the limiting speed of the motor, representing the maximum angular speed of the motor output max Vmax is the maximum linear speed of the driving roll, representing the adaptive limiting value of the mill linear speed, D is the diameter of the driving roll, N is the limiting speed of the motor, representing the maximum angular speed of the motor output

[0042] Specifically, the primary control system is an automation level system, which uses a controller to control the input and output of I / O signals. The secondary control system is a process control level system, which includes tracking logic control and model calculation, and realizes the optimization setting calculation of control parameters through a series of mathematical models and control algorithms, and transmits them to the primary control system. The controller is a PLC programmable controller, which is not limited here.

[0043] In an optional embodiment, the rolling mill is a 20-roll reversible cold rolling mill, such as Figure 3 As shown, it includes an upper roll set and a lower roll set arranged oppositely and symmetrically, the upper roll set and the lower roll set each include 10 rolls, the 10 rolls include 1 work roll 1, 2 first intermediate transmission rolls 2, 3 second intermediate transmission rolls, and 4 support rolls 4, the 2 first intermediate transmission rolls 2 are in surface contact with the work roll 1, the 3 second intermediate transmission rolls are in surface contact with the 2 first intermediate transmission rolls 2, and the 4 support rolls 4 are in surface contact with the 3 second intermediate transmission rolls; among the 3 second intermediate transmission rolls, two second intermediate transmission rolls at the edges are driving rolls 3A, and the second intermediate transmission roll between the two driving rolls 3A is a free roll 3B; the driving roll 3A is drivingly connected to the output end of the motor through a reduction box, for providing power for the work roll 1; the mill linear speed is the linear speed of the work roll. The lower roll set is symmetrically arranged with the upper roll set, which is not repeated here. When calculating the maximum linear speed of the driving roll 3A by the formula Since the 4 driving rolls 3A are drivingly connected to the motor through the gear box, it is equivalent to one motor controlling the speed of 4 driving rolls through the gear box, the gear ratio Gr of the reduction box is 1, and the specific calculation process is a conventional process, which is not repeated here.

[0044] During the rolling process, the steel 5 becomes thinner and longer with the increase of the pass, if a fixed limiting value is used to limit the mill linear speed, as shown in Figure 3 the 20-roll reversible cold rolling mill in the existing 6 rolling processes, the mill set design maximum linear speed is a fixed value, as shown in Figure 2As shown, the fixed value calculated using the minimum two intermediate drive rollers, i.e., the drive roller 3A, is insufficient to maximize the equipment's production efficiency when the diameters of the two intermediate drive rollers are large, resulting in a waste of resources. Furthermore, there is still room for improvement in the maximum design speed of the motor. If the method of this embodiment is adopted, such as... Figure 1 As shown, during passes 1-3, the reduction rate is relatively high, and the main motor load current is very large (100%-120%). It is impossible to use the motor's maximum speed under the same maximum power limit. Blindly increasing the speed will cause the overturning torque (maximum permissible torque) to drop sharply with increasing speed (inversely proportional to the square of the speed), leading to abnormal heating of the motor stator windings. In severe cases, this can cause the motor to be unable to drive the load and shut down abnormally. At this time, the maximum permissible linear speed given by the secondary system is generally less than the limit given by the primary system. To ensure equipment safety, a fixed limit value must be used to limit the unit's linear speed. In passes 4-6, the reduction rate is relatively small, and the load current of the main motor of the rolling mill is not high (below 100%). This allows for production at speeds exceeding the design limits of the motor. Then, based on the actual diameter of the two intermediate drive rolls (drive roll 3A) and the design limits of the motor, the adaptive limit value of the unit's linear speed is calculated using a formula. In other words, in passes 4-6, the maximum adaptive unit linear speed is calculated using the limit speed and the actual diameter of the two intermediate rolls. By adaptively changing the unit's linear speed according to the diameter of the drive roll, the maximum production efficiency of the equipment can be achieved while increasing the speed.

[0045] The following describes an embodiment of the apparatus described in this application, which can be used to execute the mill control method described 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 mill control method described above.

[0046] Figure 4 This is a block diagram illustrating a rolling mill control device according to an embodiment of this application; see also... Figure 4 As shown, a mill control device 600 according to one embodiment of this application is used to control the linear speed of the mill unit during multi-pass rolling processes, such as... Figure 4 As shown, it includes: a calculation unit 601, used to calculate the maximum linear speed of the active roller based on the motor's maximum speed and the diameter of the active roller, and obtain an adaptive limit value for the unit's linear speed; and a control unit 602, used to control the unit's linear speed to not exceed the adaptive limit value during the multi-pass rolling process.

[0047] As another aspect, the present application also provides a computer readable storage medium having stored thereon a program product capable of implementing the rolling mill control method described above. In some possible embodiments, various aspects of the present application can also be implemented in the form of a program product including program code, which, when run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section above according to various exemplary embodiments of the present application.

[0048] Reference Figure 5 As shown, a program product 700 for implementing the method described above according to embodiments of the present application is described, which can take the form of a portable compact disc read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product of the present application is not limited thereto, and in the present document, the readable storage medium can 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.

[0049] The program product can take any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium, for example, can be, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination thereof. More specific examples (non-exhaustive list) of the readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0050] The computer readable signal medium can include a data signal propagated in baseband or propagated as a carrier wave in a propagated data signal, in which the readable program code is carried. Such a propagated data signal can take many forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination thereof. The readable signal medium can also be any readable medium that is not a readable storage medium and that can transmit, propagate or transport the program for use by or in connection with an instruction execution system, apparatus or device.

[0051] The program code contained on the readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0052] The program code may be implemented in any of various ways, including procedure-based, narrative-based, object-based, class-based, and / or hierarchical-based programming. One or more programming languages can be employed to implement the program code, including an object-oriented programming language such as Java, C++, or the like, and a conventional procedural programming language such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server. In the latter scenario, the remote computing device can be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computing device, such as through the Internet using an Internet Service Provider (ISP).

[0053] As another aspect, the present application also provides an electronic device capable of implementing the above method.

[0054] Those skilled in the art can understand that each aspect of the present application can be implemented as a system, a method or a program product. Therefore, each aspect of the present application can be specifically implemented as follows: a complete hardware embodiment, a complete software embodiment (including firmware, microcode, etc.), or an embodiment combining hardware and software aspects, which can be collectively referred to as "circuitry", "module" or "system" herein.

[0055] The electronic device 800 according to this embodiment of the present application will be described below with reference to Figure 6 Figure 6 The display electronic device 800 is merely an example and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0056] As shown in Figure 6 The components of the electronic device 800 can include, but are not limited to, the at least one processing unit 810, the at least one storage unit 820, a bus 830 connecting different system components (including the storage unit 820 and the processing unit 810), and a display unit 840.

[0057] The storage unit 820 stores program code which can be executed by the processing unit 810, so that the processing unit 810 performs the steps according to various exemplary embodiments of the present application described in the above "Embodiment Method" section of the present specification.

[0058] ​Storage unit 820 may include readable media in the form of volatile storage units, such as random access memory (RAM) 821 and / or cache memory 822, and may further include read-only memory (ROM) 823.

[0059] The storage unit 820 may also include a program / utility 824 having a set (at least one) of program modules 825, 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.

[0060] Bus 830 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.

[0061] Electronic device 800 can also communicate with one or more external devices 900 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 800, and / or with any device that enables electronic device 800 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 850. Furthermore, electronic device 800 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 860. As shown, network adapter 860 communicates with other modules of electronic device 800 via bus 830. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 800, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0062] 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.

[0063] Therefore, the technical solution 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, mobile 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.

[0064] Moreover, the above-described diagrams are only schematic and are non-limiting view of the processes included in the method according to the exemplary embodiments of the present application, and so the processes shown in the above-described diagrams are not intended to indicate or limit the time order of the processes. In addition, it will be readily understood that the processes can be carried out simultaneously or asynchronously, for example, in multiple modules.

[0065] It is to be understood that the application is not limited to the precise construction described above and shown in the attached drawings, and that various modifications and changes can be effected thereon without departing from the scope of the application. The scope of the application should only be limited by the appended claims.

[0066] The technical solutions provided in the embodiments of the application have at least the following technical effects or advantages: the maximum adaptive machine set linear speed is calculated using the limit rotating speed of the motor and the diameter of the driving roller, and the maximum linear speed operation of the machine set is realized; on the basis of the maximum design linear speed of the machine set, and without increasing or changing the hardware devices, the speed is safely and scientifically increased, the purpose of playing the super maximum design limit performance of the device and improving the yield without affecting the service life of the device is achieved, and the market share and yield are further improved.

[0067] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0068] Similarly, it is to be understood that the various features of the disclosure can be used alone or in any combination depending on the application of the present application. In the description of the example embodiments of the present application above, various features of the present application are sometimes grouped together in a single embodiment, figure, or description of a related transaction. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed application requires more features than are explicitly claimed in each claim. Rather, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into this detailed description, with each claim acting as a separate embodiment of the application. In the claims, the word "comprising" does not exclude the presence of elements or steps other than those listed in a given claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0069] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps not listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices or means can be listed, comprising means which can be implemented by one and the same hardware item. The use of the word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The word 'first','second', 'third' etc. can merely be used for distinguishing between similar elements, and do not imply any order or priority.

Claims

1. A rolling mill control method, characterized by, In a multi-pass rolling process of a rolling mill, a group line speed of the rolling mill is controlled, comprising: calculating a maximum linear speed of the driving roller according to a limit rotating speed of the motor and a diameter of the driving roller to obtain an adaptive limiting value of the group line speed; controlling the group line speed not to exceed the adaptive limiting value in the multi-pass rolling process; the control of the group line speed of the rolling mill further comprises: a first limiting value of the group line speed is given by an internal first control system of the rolling mill, a second limiting value of the group line speed is given by a second control system of the rolling mill, and a fixed limiting value of the group line speed is obtained by taking a smaller one of the first limiting value and the second limiting value; the multi-pass rolling process of the rolling mill is a 6-pass rolling process, and the group line speed is controlled not to exceed the fixed limiting value in the first to third pass rolling processes and not to exceed the adaptive limiting value in the fourth to sixth pass rolling processes.

2. The mill control method of claim 1, wherein, The first control system is an automatic level system, and a controller is used to control input and output of I / O signals.

3. The mill control method of claim 1, wherein, The second control system is a process control level system, which comprises tracking logic control and model calculation, and realizes optimization setting calculation of control parameters through a series of mathematical models and control algorithms and transmits the control parameters to the first control system.

4. The mill control method of claim 1, wherein, The calculation of the maximum linear speed of the driving roller according to the limit rotating speed of the motor and the diameter of the driving roller to obtain the adaptive limiting value of the group line speed comprises: The maximum linear speed of the driving roller is calculated by the formula where V max is the maximum linear speed of the driving roller, represents the adaptive limiting value of the line speed of the machine set, D is the diameter of the driving roller, N max is the limit speed of the motor, represents the maximum angular speed of the motor output, and Gr is the gear ratio of the reduction gearbox.

5. The rolling mill control method according to claim 1 or 4, characterized in that, The rolling mill is a 20-roller reversible cold rolling mill, which comprises an upper roller group and a lower roller group arranged oppositely and symmetrically, the upper roller group and the lower roller group each comprise 10 rollers, the 10 rollers comprise one work roller, two first intermediate transmission rollers, three second intermediate transmission rollers and four support rollers, the two first intermediate transmission rollers are in surface contact with the work roller, the three second intermediate transmission rollers are in surface contact with the two first intermediate transmission rollers, and the four support rollers are in surface contact with the three second intermediate transmission rollers, wherein two second intermediate transmission rollers at the edges of the three second intermediate transmission rollers are the driving rollers, the driving rollers are drivingly connected to the output end of the motor through a speed reducer, and the group line speed is the linear speed of the work roller.

6. A rolling mill control device, characterized by, For controlling a group line speed of a rolling mill in a multi-pass rolling process of the rolling mill, comprising: a calculation unit configured to calculate a maximum linear speed of the driving roller according to a limit rotating speed of the motor and a diameter of the driving roller to obtain an adaptive limiting value of the group line speed; a control unit configured to control the group line speed not to exceed the adaptive limiting value in the multi-pass rolling process; the device is further configured to: a first limiting value of the group line speed is given by an internal first control system of the rolling mill, a second limiting value of the group line speed is given by a second control system of the rolling mill, and a fixed limiting value of the group line speed is obtained by taking a smaller one of the first limiting value and the second limiting value; the device is further configured to: The multi-pass rolling of the rolling mill is 6-pass rolling, and during the first to third pass rolling, the line speed of the mill train is controlled to be not more than the fixed limiting value; during the fourth to sixth pass rolling, the line speed of the mill train is controlled to be not more than the adaptive limiting value.

7. A computer readable storage medium characterized in that, The computer readable storage medium stores at least one program code, and the at least one program code is loaded and executed by the processor to implement the rolling mill control method in any one of claims 1-5.

8. A rolling mill control electronic device, characterized by comprising: The electronic device comprises one or more processors and one or more memories, and the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the rolling mill control method in any one of claims 1-5.

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