Loop control method and device

Abstract

The application discloses a kind of control method and device of loop, the control method is by obtaining the preset speed limiting value of target loop, when receiving the node signal that current strip enters rolling mill, it is explained that the change of the steel coil that rolling mill is rolled on endless rolling production line is occurred, the loop speed adjustment amount of current strip is determined, according to preset speed limiting value and loop speed adjustment amount, the cascade speed interval of target loop is obtained, when rolling current strip, the running speed of target loop is controlled in cascade speed interval, to prevent the running speed of target loop reaches preset speed limiting value and cannot be adjusted, and then improve the reliability of loop control on strip production line.

Description

Technical Field

[0001] This application relates to the technical field of looper control, and more particularly to a looper control method and apparatus. Background Technology

[0002] Thin slab continuous casting and rolling is renowned for its energy conservation, consumption reduction, and lower production costs. Among these technologies, the endless rolling process is considered the third technological revolution in the steel industry, representing the highest level of hot-rolled strip steel production worldwide. Compared to traditional hot rolling, endless rolling lines offer a wider product range, broader market applications, and a higher proportion of thin-gauge products. Furthermore, thin-gauge strip steel allows for the substitution of cold-rolled products with hot-rolled ones, a process known as "hot instead of cold." There is no cutting of intermediate slab ends, resulting in a higher yield than traditional hot rolling. Due to the uniform slab temperature, the finished product performance is more stable. The product's shape, coil shape, head and tail width, and thickness are significantly higher than those of the same specifications produced by CSP (Compact Strip Production). The absence of threading and tail-throwing during rolling enables stable production of a high proportion of thin-gauge products. However, during continuous production, due to variations in specifications and temperature, the flow rate fluctuations between stands are more frequent compared to traditional hot rolling, thus requiring higher rolling stability. Practice has shown that in the endless rolling production line for thin slab continuous casting and rolling, the rolling state during the endless rolling mode is unstable and the load distribution is abnormal. This causes the looper to be frequently started and adjusted, and the adjustment direction is singular. This causes the looper to cascade and reach the limit of adjustment, resulting in steel accumulation on the looper in the endless rolling production line for strip steel.

[0003] Therefore, improving the reliability of looper control on strip steel production lines is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] The present invention provides a looper control method and apparatus that can improve the reliability of looper control on strip steel production lines.

[0005] The embodiments of the present invention provide the following solutions:

[0006] In a first aspect, embodiments of the present invention provide a looper control method, applied to looper control on a headless rolling production line, the method comprising:

[0007] Obtain the preset speed limit value of the target looper, wherein the target looper is the looper whose operating speed is to be adjusted on the endless rolling production line;

[0008] Receive the node signal of the current strip entering the rolling mill, and determine the looper speed adjustment amount of the current strip;

[0009] The cascaded speed range of the target looper is obtained based on the preset speed limit value and the looper speed adjustment amount.

[0010] When rolling the current strip, the running speed of the target looper is controlled within the cascaded speed range.

[0011] In one optional embodiment, obtaining the preset speed limit value of the target looper includes:

[0012] The looper is encoded based on the position information of the mill and looper on the headless rolling production line, and the corresponding preset speed limit value is configured.

[0013] Based on the loop code of the target loop, the preset speed limit value of the target loop is output.

[0014] In one optional embodiment, determining the current looper speed adjustment amount for the strip includes:

[0015] Obtain the target looper's adjustment angle, proportional gain, and integral gain in the current cycle, wherein the looper adjustment angle is the difference between the looper's set angle and the actual looper angle;

[0016] The speed adjustment amount of the looper is obtained based on the looper adjustment angle, the proportional gain, and the integral gain.

[0017] In one optional embodiment, obtaining the looper speed adjustment amount based on the looper adjustment angle, the proportional gain, and the integral gain includes:

[0018] According to the formula Obtain the looper speed adjustment amount Δb i , where Δθ i K adjusts the angle of the looper. T K is the angle conversion factor. P For the aforementioned proportional gain, K I Let be the integral gain, and s be a complex factor.

[0019] In one optional embodiment, the obtaining of the looper speed adjustment amount Δb i Previously, it also included:

[0020] Obtain the velocity and angle changes of the target loop in the current cycle;

[0021] The angle conversion coefficient is obtained based on the ratio of the velocity change to the angle change.

[0022] In an optional embodiment, after obtaining the looper speed adjustment amount based on the looper adjustment angle, the proportional gain, and the integral gain, the method further includes:

[0023] Determine whether the adjustment amount of the looper speed is greater than a preset range;

[0024] If so, the loop speed adjustment amount is updated according to the extreme value of the preset range.

[0025] In an optional embodiment, after controlling the operating speed of the target looper within the cascaded speed range, the method further includes:

[0026] Determine whether the current rolling roll period of the headless rolling production line has ended;

[0027] If so, the cascaded speed range is updated to the preset speed limit value;

[0028] If not, the cascade speed range is updated based on the node signal and the historical cascade speed range to adjust the operating speed of the target looper until the current rolling period ends.

[0029] Secondly, embodiments of the present invention also provide a looper control device, applied to looper control on a headless rolling production line, the method comprising:

[0030] The acquisition module is used to acquire the preset speed limit value of the target looper, wherein the target looper is the looper whose operating speed is to be adjusted on the endless rolling production line;

[0031] The first determining module is used to receive the node signal of the current strip entering the rolling mill and determine the looper speed adjustment amount of the current strip.

[0032] The obtaining module is used to obtain the cascade speed range of the target looper based on the preset speed limit value and the looper speed adjustment amount;

[0033] The control module is used to control the running speed of the target looper within the cascaded speed range during the rolling of the current strip.

[0034] Thirdly, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the methods described in the first aspect.

[0035] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the first aspects.

[0036] The control method and apparatus for the looper of the present invention have the following advantages compared with the prior art:

[0037] The control method of this invention obtains the preset speed limit value of the target looper. When a node signal indicating that the current strip steel is entering the rolling mill is received, it indicates that the steel coil being rolled on the endless rolling production line has changed. The looper speed adjustment amount for the current strip steel is determined. Based on the preset speed limit value and the looper speed adjustment amount, the cascaded speed range of the target looper is obtained. When rolling the current strip steel, the running speed of the target looper is controlled within the cascaded speed range to prevent the running speed of the target looper from reaching the preset speed limit value and becoming unadjustable, thereby improving the reliability of looper control on the strip steel production line. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart of a loop control method provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the headless rolling production line provided in an embodiment of the present invention;

[0041] Figure 3 The control flowchart for the target looper provided in the embodiments of the present invention;

[0042] Figure 4 A schematic diagram illustrating the dynamic adjustment of the target loop provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of a looper control device provided in an embodiment of the present invention. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the protection scope of the embodiments of the present invention.

[0045] This invention provides a looper control method applied to looper control on a headless rolling production line, the method comprising:

[0046] S11. Obtain the preset speed limit value of the target looper, wherein the target looper is the looper whose operating speed is to be adjusted on the headless rolling production line.

[0047] Specifically, the preset speed limit can be set based on the position of the target looper on the endless rolling production line. The function of the looper on the endless rolling production line is to match the flow rate between adjacent rolling mills. Due to the limitation of the rolling mill transmission efficiency, the operating speed limit of the looper is ±90% of the rolling mill speed. Usually, the preset speed limit is ±40% to ±70% of the rolling mill speed. It can be freely set within the set speed limit based on the operating speed required by the target looper to ensure the stable operation of the endless rolling production line.

[0048] In practical applications, due to the large number of mills and loopers on the headless rolling production line, the preset speed limit value of the target looper may be obtained incorrectly.

[0049] In one specific implementation, obtaining the preset speed limit value of the target loop includes:

[0050] Based on the position information of the mill and looper on the headless rolling production line, the looper is encoded and configured with a corresponding preset speed limit value; based on the looper code of the target looper, the preset speed limit value of the target looper is output.

[0051] Specifically, the position information of the rolling mill and loopers characterizes their positional relationship. Based on this, each looper can be coded, with each looper having a unique identification code. Each looper is configured with a corresponding preset speed limit value based on the characteristics of endless rolling. The corresponding preset speed limit value can be found by looking up the looper code of the target looper. This processing method facilitates the management and adjustment of each looper and improves the reliability of obtaining the preset speed limit value of the target looper.

[0052] Please see Figure 2 Taking a thin slab continuous casting and rolling line without end as an example, it includes 3 roughing mill stands and 5 finishing mill stands. The roughing mill stands are H0, H1 and H2, and the finishing mill stands are F1, F2, F3, F4 and F5. The loops between the 3 roughing mill stands are designated as loops 1# and 2#, the loop between the roughing and finishing mills is designated as loop 3#, and the loops between the finishing mill stands are designated as loops 4#, 5#, 6# and 7#. Since the spacing between each stand is different, for example, the spacing between the roughing mill stands is 5500mm, the spacing between the finishing mill stands is 5000mm, and the spacing between the roughing and finishing mill stands is relatively long at 26.8m. It is equipped with equipment such as rotary shear, induction heating, and fine descaling. Therefore, it is necessary to configure a corresponding preset speed limit value for each loop. Based on the loop code of the target loop, the preset speed limit value can be found. After obtaining the preset speed limit value of the target loop, proceed to step S12.

[0053] S12. Receive the node signal of the current strip entering the rolling mill, and determine the looper speed adjustment amount of the current strip.

[0054] Specifically, in endless rolling, multiple coils of strip steel of different specifications are arranged on the same rolling mill rolls and continuously rolled within that rolls. After rolling, the strips are cut. The node signal represents the signal indicating the connection point between different coils of strip steel entering the mill. This indicates that the head of the current strip steel enters the mill at the moment the node signal is received. To prevent the target looper's operating speed from reaching the preset speed limit, the looper speed adjustment amount is determined. This looper speed adjustment amount represents the correction to the preset speed limit. It can be understood that the looper speed adjustment amount can be set to a fixed value based on the experience of technicians or calibration tests, or it can be calculated based on the real-time situation of the endless rolling production line.

[0055] In practical applications, because the looper may need to be adjusted accordingly during variable-specification rolling on a headless rolling line, setting the looper speed adjustment amount to a fixed value may result in insufficient accuracy. Therefore, in one specific implementation, determining the current looper speed adjustment amount for the strip includes:

[0056] Obtain the loop adjustment angle, proportional gain, and integral gain of the target loop in the current cycle, where the loop adjustment angle is the difference between the loop set angle and the actual loop angle; obtain the loop speed adjustment amount based on the loop adjustment angle, proportional gain, and integral gain.

[0057] Specifically, the current cycle represents the duration of a single adjustment of the target looper in real-time dynamic adjustment. Looper adjustment can be implemented based on PID (Proportional Integral Derivative) control, allowing for real-time adjustment within a single scan cycle. Alternatively, PI control can be used to obtain the proportional and integral gains of the target looper. The looper adjustment angle represents the difference between the set angle and the actual angle of the looper in the current cycle. The looper speed adjustment amount can be calculated using the adjustment angle, proportional gain, and integral gain.

[0058] In one specific implementation, the looper speed adjustment amount is obtained based on the looper adjustment angle, proportional gain, and integral gain, including:

[0059] According to the formula Obtain the looper speed adjustment amount Δb i , where Δθ i To adjust the angle with a loop, K T K is the angle conversion factor. P For proportional gain, K I Let be the integral gain, and s be a complex factor.

[0060] Specifically, the angle conversion coefficient is 0.001-0.002, the proportional gain is 0.8-1.4, and the integral gain is 0.5-0.9. During the debugging process, the setpoint can be selected within the above range to accurately calculate the looper speed adjustment amount according to the formula. Those skilled in the art will understand that in PID control, the complex factor (or complex domain) is obtained by transforming the time domain using Laplace transform, where the time domain is the duration of the current cycle.

[0061] In one specific implementation, the looper speed adjustment amount Δb is obtained. i Previously, it also included:

[0062] Obtain the velocity and angle changes of the target loop in the current cycle; obtain the angle conversion coefficient based on the ratio of the velocity change to the angle change.

[0063] Specifically, when the endless rolling production line is performing endless rolling of strip steel, the looper will adaptively change based on the overall production line control strategy to adjust the flow rate per second of adjacent stands. It usually makes real-time adaptive adjustments according to a set cycle. The speed change and angle change in the current cycle represent the adaptive changes of the looper in the endless rolling process. The ratio of the speed change to the angle change is the angle conversion coefficient.

[0064] In one specific implementation, after obtaining the looper speed adjustment amount based on the looper adjustment angle, proportional gain, and integral gain, the method further includes:

[0065] Determine whether the looper speed adjustment amount is greater than the preset range; if so, update the looper speed adjustment amount according to the extreme value of the preset range.

[0066] Specifically, the preset range can be set to ±2% of the rolling mill speed. If the looper speed adjustment is greater than the preset range, it indicates a possible data acquisition or calculation error, and the looper speed adjustment can be recalculated based on the data to update the adjustment. To reduce the impact of an excessively large looper speed adjustment on the looper, the adjustment can also be updated based on the extreme value of the preset range. For example, if the calculated looper speed adjustment is negative and greater than the preset range, the adjustment is updated to -2%. Conversely, if the calculated looper speed adjustment is positive and greater than the preset range, the adjustment is updated to 2%. After determining the current looper speed adjustment for the strip, proceed to step S13.

[0067] S13. Based on the preset speed limit value and the loop speed adjustment amount, obtain the cascade speed range of the target loop.

[0068] Specifically, the cascaded speed range is the result of superimposing the preset speed limit value and the looper speed adjustment amount. For example, the preset speed limit value is ±a. i a iThe value range is 40% to 70% of the rack speed, and the looper speed adjustment is b. i b i If the speed is 2% of the rack speed, then the lower limit of the cascade speed range of the target loop is -a. i +b i The upper limit of the cascaded speed range is a. i +b i After obtaining the cascaded speed range of the target loop, proceed to step S14.

[0069] S14. When rolling the current strip, the running speed of the target looper is controlled within the cascade speed range.

[0070] Specifically, since the cascaded speed range is updated based on the preset speed limit value, the running speed of the target looper is controlled within the cascaded speed range when rolling the current strip steel, which will not cause the problem of cascaded adjustment exceeding the limit, thereby improving the reliability of looper control on the strip steel production line.

[0071] In one specific implementation, after controlling the operating speed of the target loop within the cascaded speed range, the method further includes:

[0072] Determine whether the current rolling roll period of the headless rolling production line has ended; if so, update the cascade speed range to the preset speed limit value; if not, update the cascade speed range based on the node signal and the historical cascade speed range to adjust the running speed of the target looper until the current rolling roll period ends.

[0073] Specifically, the endless rolling production line splices multiple coils of strip steel and continuously rolls them in the current rolling period. If the current rolling period has not ended, it means that there is still unrolled strip steel. The cascade speed range is then updated based on the node signal and the historical cascade speed range, which is the cascade speed range of the previous cycle. The running speed of the target looper is adjusted through iterative calculation until all strip steel in the current rolling period is rolled. If the current rolling period ends, it means that all strip steel has been rolled. The cascade speed range is then updated to the preset speed limit value, that is, the looper speed adjustment amount in the setting register is cleared to zero.

[0074] The following will combine Figure 3-4Taking the No. 4 looper as an example, the control method of the looper on the endless rolling production line provided by the embodiment of the present invention is specifically explained. The preset speed limit value (or the initial value of the speed cascade limit) of the looper is given as ±70%. The node signal of the stand F1 is obtained. The current looper speed adjustment amount of the steel coil can be determined based on the signal transition edge. The calculation result is 1.5%. The preset speed limit value and the looper speed adjustment amount are superimposed to obtain the cascade speed range (or the speed cascade limit value). The upper limit value of the range is calculated to be 71.5%, and the lower limit value is 68.5%. The running speed of the looper is adjusted within this range. It is determined whether the endless rolling has been terminated. If it has not been terminated, the above calculation and operation are repeated until the node signal of the stand F1 is obtained. By accumulating the looper speed cascade adjustment amount to 20%, the final cascade speed range upper limit value is 90%, and the lower limit value is 50%, realizing the dynamic matching of the looper speed cascade limit value with the looper speed cascade adjustment amount. If it is terminated, the process ends and exits.

[0075] Based on the same inventive concept as the control method, embodiments of the present invention also provide a loop control device, please refer to [link to relevant documentation]. Figure 5 The method for looper control applied to a headless rolling production line includes:

[0076] The acquisition module 501 is used to acquire the preset speed limit value of the target looper, wherein the target looper is the looper whose operating speed is to be adjusted on the endless rolling production line;

[0077] The first determining module 502 is used to receive the node signal of the current strip entering the rolling mill and determine the looper speed adjustment amount of the current strip.

[0078] The module 503 is used to obtain the cascade speed range of the target looper based on the preset speed limit value and the looper speed adjustment amount;

[0079] The control module 504 is used to control the running speed of the target looper within the cascade speed range when rolling the current strip.

[0080] In one optional embodiment, the acquisition module includes:

[0081] The configuration submodule is used to encode the looper based on the position information of the mill and looper on the headless rolling production line, and configure the corresponding preset speed limit value;

[0082] The output submodule is used to output the preset speed limit value of the target loop based on the loop encoding of the target loop.

[0083] In one optional embodiment, the obtaining module includes:

[0084] The first acquisition submodule is used to acquire the target looper's adjustment angle, proportional gain, and integral gain in the current cycle, wherein the looper adjustment angle is the difference between the looper's set angle and the actual looper angle.

[0085] The first obtaining submodule is used to obtain the loop speed adjustment amount based on the loop adjustment angle, the proportional gain, and the integral gain.

[0086] In one optional embodiment, the obtaining submodule includes:

[0087] Obtaining a unit, used according to the formula Obtain the looper speed adjustment amount Δb i , where Δθ i K adjusts the angle of the looper. T K is the angle conversion factor. P For the aforementioned proportional gain, K I Let be the integral gain, and s be a complex factor.

[0088] In an optional embodiment, the obtaining module further includes:

[0089] The second acquisition submodule is used to acquire the velocity change and angle change of the target loop in the current cycle;

[0090] The second obtaining submodule is used to obtain the angle conversion coefficient based on the ratio of the speed change to the angle change.

[0091] In an optional embodiment, the obtaining module further includes:

[0092] The judgment submodule is used to determine whether the adjustment amount of the looper speed is greater than a preset range;

[0093] The update submodule is used to update the looper speed adjustment amount according to the extreme value of the preset range when the looper speed adjustment amount is greater than the preset range.

[0094] In one optional embodiment, the control device includes:

[0095] The second determining module is used to determine whether the current rolling roll period of the headless rolling production line has ended;

[0096] The first update module is used to update the cascade speed range to the preset speed limit value when the current rolling roll period of the headless rolling production line has not ended.

[0097] The second update module is used to update the cascade speed range based on the node signal and the historical cascade speed range when the current rolling roll period of the headless rolling production line ends, so as to adjust the running speed of the target looper until the current rolling roll period ends.

[0098] Based on the same inventive concept as the control method, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the control methods.

[0099] Based on the same inventive concept as the control method, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the control methods.

[0100] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0101] By acquiring the preset speed limit value of the target looper, when the node signal of the current strip entering the rolling mill is received, it indicates that the steel coil rolled by the mill on the endless rolling production line has changed. The speed adjustment amount of the looper for the current strip is determined. Based on the preset speed limit value and the looper speed adjustment amount, the cascade speed range of the target looper is obtained. When rolling the current strip, the running speed of the target looper is controlled within the cascade speed range to prevent the running speed of the target looper from reaching the preset speed limit value and being unable to be adjusted, thereby improving the reliability of looper control on the strip production line.

[0102] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0103] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0104] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0106] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0107] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling a loop, characterized in that, A method for looper control applied to a headless rolling mill production line, the method comprising: Based on the position information of the mill and loopers on the endless rolling production line, the looper code of each looper on the endless rolling production line is determined, and the corresponding preset speed limit value is configured. Based on the looper code of the target looper, the preset speed limit value of the target looper is output; wherein, the target looper is the looper whose operating speed is to be adjusted on the endless rolling production line; Receive the node signal of the current strip entering the rolling mill, and obtain the looper adjustment angle, proportional gain and integral gain of the target looper in the current cycle, wherein the looper adjustment angle is the difference between the looper set angle and the actual looper angle. According to the formula To obtain the looper speed adjustment amount ,in, Adjust the angle of the loop. This is the angle conversion factor. The proportional gain, The integral gain, where s is a complex factor; The cascaded speed range of the target looper is obtained based on the preset speed limit value and the looper speed adjustment amount. When rolling the current strip, the running speed of the target looper is controlled within the cascaded speed range.

2. The control method for the looper according to claim 1, characterized in that, The obtained looper speed adjustment amount Previously, it also included: Obtain the velocity and angle changes of the target loop in the current cycle; The angle conversion coefficient is obtained based on the ratio of the velocity change to the angle change.

3. The control method for the looper according to claim 1, characterized in that, After obtaining the looper speed adjustment amount based on the looper adjustment angle, the proportional gain, and the integral gain, the method further includes: Determine whether the adjustment amount of the looper speed is greater than a preset range; If so, the loop speed adjustment amount is updated according to the extreme value of the preset range.

4. The control method for the looper according to claim 1, characterized in that, After controlling the operating speed of the target loop within the cascaded speed range, the method further includes: Determine whether the current rolling roll period of the headless rolling production line has ended; If so, the cascaded speed range is updated to the preset speed limit value; If not, the cascade speed range is updated based on the node signal and the historical cascade speed range to adjust the operating speed of the target looper until the current rolling period ends.

5. A looper control device, characterized in that, A method for looper control applied to a headless rolling mill production line, the method comprising: The acquisition module is used to determine the looper code of each looper on the endless rolling production line based on the position information of the mill and looper on the endless rolling production line, and configure the corresponding preset speed limit value; based on the looper code of the target looper, output the preset speed limit value of the target looper; wherein, the target looper is the looper on the endless rolling production line whose operating speed is to be adjusted. The first determining module is used to receive the node signal of the current strip entering the rolling mill, and to obtain the looper adjustment angle, proportional gain, and integral gain of the target looper in the current cycle, wherein the looper adjustment angle is the difference between the looper's set angle and the actual looper angle; according to the formula To obtain the looper speed adjustment amount ,in, Adjust the angle of the loop. This is the angle conversion factor. The proportional gain, The integral gain, where s is a complex factor; The obtaining module is used to obtain the cascade speed range of the target looper based on the preset speed limit value and the looper speed adjustment amount; The control module is used to control the running speed of the target looper within the cascaded speed range during the rolling of the current strip.

6. An electronic device, characterized in that, It includes a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method of any one of claims 1-4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-4.

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