A method and system for mill defect control incorporating elongation correction and multi-stage speed reduction

Abstract

This application discloses a method and system for controlling defects in rolling mills that combines elongation correction and multi-stage deceleration, belonging to the field of metal rolling defect control technology. The key technical points include a strip length detection module that monitors the strip's moving speed and position through a first encoder and a second encoder and mutually corrects errors; an elongation retrieval module that retrieves the target elongation; a defect location module that obtains the initial defect position; a data processing module that calculates the actual defect position; and a control module that sets a threshold based on the actual defect position and sends deceleration or speed recovery commands. It also includes a corresponding control method and a computer device for implementing the method. This application achieves the technical effects of accurately collecting strip running information, precisely locating defect positions, ensuring the safe and stable operation of the rolling mill through a multi-stage deceleration strategy, and reducing equipment damage and product quality problems caused by defects.

Description

Technical Field

[0001] This application relates to the field of metal rolling defect control technology, and in particular to a rolling mill defect control method and system that combines elongation correction and multi-stage deceleration. Background Technology

[0002] With the continuous development of industrial automation and manufacturing, strip steel rolling technology has become increasingly mature. As a crucial raw material in many industrial sectors, the quality and production efficiency of strip steel directly impact the development of downstream industries. High-quality strip steel ensures product performance and reliability, and improves production stability and safety. An efficient rolling process can reduce costs, increase capacity, and enhance a company's competitiveness in the market. Therefore, quality control and efficiency improvement in the strip steel rolling process have always been key focuses for the industry.

[0003] In traditional rolling mill production, when operators discover defects such as scratches, uneven thickness, abrasions, pits, marks, cracks, or overheating on the strip surface during the strip rolling process, they typically address these defects by manually controlling the mill to slow down. Some operators rely on their personal experience to roughly determine when to slow down and when to restore speed, while others simply follow a fixed deceleration pattern without considering the real-time condition and changes of the strip itself.

[0004] However, these existing control methods have significant drawbacks. Due to the lack of precise positioning logic linked to strip elongation, operators cannot quickly calculate the actual location of a defect after it has elongated with the strip during rolling, leading to delayed or premature defect handling and affecting repair effectiveness. Furthermore, the trigger points for deceleration and speed recovery rely entirely on operator experience, which can easily result in excessive deceleration even in non-defective areas of the strip due to human error, reducing production efficiency, or the defective area not being fully within the deceleration range, leading to incomplete defect handling. Summary of the Invention

[0005] To address the problems in existing mill defect handling methods, such as inaccurate defect handling timing due to lack of precise location positioning related to elongation, low matching degree of deceleration interval due to reliance on manual experience, and impact on repair effectiveness and production efficiency, this invention provides a mill defect control method and system that combines elongation correction and multi-stage deceleration.

[0006] The present invention provides a mill defect control system that combines elongation correction and multi-stage deceleration, employing the following technical solution: A mill defect control system combining elongation correction and multi-stage deceleration includes: The strip length detection module includes a first encoder and a second encoder. The first encoder is connected to the strip roll, and the second encoder is connected to the strip roll. The strip length detection module is used to monitor the moving speed and position of the strip through the first encoder and the second encoder, and to reduce the measurement error caused by slippage and deviation through mutual correction, so as to collect the running length and position information of the strip in real time. The elongation rate retrieval module has a pre-stored elongation rate database corresponding to the strip steel type and rolling pass, which is used to directly retrieve the corresponding target elongation rate according to the current strip steel type and rolling pass. The defect location module is used to detect and obtain the initial defect location of the strip steel. The data processing module, electrically connected to the defect location module and the elongation retrieval module, is used to receive the initial defect location and the target elongation, and calculate the actual position of the defect in the strip after rolling in the current rolling pass based on the initial defect location and the target elongation. The control module is electrically connected to the data processing module and the rolling mill drive system, respectively. It is used to receive the actual location of the defect, set the deceleration start threshold and recovery speed threshold according to the actual location of the defect, and send deceleration command or recovery speed command to the rolling mill drive system according to the real-time position of the strip.

[0007] By adopting the above technical solutions, the first and second encoders of the strip length detection module jointly monitor the strip's moving speed and position and correct each other, which can reduce measurement errors and collect strip running length and position information in real time; the elongation retrieval module can quickly retrieve the target elongation rate according to the strip type and rolling pass; the defect location module can detect and obtain the initial defect position of the strip; the data processing module can calculate the actual position of the defect in the strip after rolling in the current rolling pass based on the initial defect position and the target elongation rate; the control module can set a threshold according to the actual defect position and send deceleration or speed recovery commands to the rolling mill drive system according to the real-time position of the strip, thereby achieving effective control of the rolling mill.

[0008] Preferably, the control module is configured to execute a multi-level deceleration strategy, including: At a first distance before the actual location of the defect, the control mill begins to decelerate; At a second distance before the actual location of the defect, the mill speed is controlled to decrease to a preset safe speed range, wherein the second distance is less than the first distance.

[0009] By adopting the above technical solutions, the multi-stage deceleration strategy can enable the rolling mill to decelerate in an orderly manner when approaching the actual location of the defect, and reasonably reduce the speed at different stages. This can better cope with strip defects, avoid adverse effects on the strip due to excessive speed, and ensure the stability and safety of the rolling process.

[0010] Preferably, the control module is further configured to control the rolling mill to gradually accelerate back to its original speed at a third distance after the actual location of the defect has passed.

[0011] By adopting the above technical solutions, the rolling mill can smoothly return to its original speed after passing a certain distance from the actual location of the defect, avoiding the adverse effects of sudden speed changes on the strip rolling process and equipment, and ensuring the continuity and stability of rolling production.

[0012] Preferably, the defect location module includes a high-definition camera and a fluorescence unit. The fluorescence unit is used to enhance the image contrast of defects on the strip surface. The high-definition camera is used to capture edge cracks and / or burrs on the strip surface in an oil mist environment, and sends the detected defect location information as the initial defect location to the data processing module.

[0013] By adopting the above technical solution, the image contrast of the strip surface defects is enhanced by the use of the fluorescent unit, enabling the high-definition camera to capture the cracked edge defects and / or burr defects on the strip surface more clearly and accurately in the oil mist environment, thereby obtaining the initial defect location information more accurately and sending it to the data processing module.

[0014] Preferably, it also includes an operation interaction module, which allows the operator to input the initial defect discovery location and display the retrieved strip elongation, the actual location of the defect, and the current speed information of the rolling mill.

[0015] By adopting the above technical solution, the operation interaction module allows operators to input the initial defect location, facilitating manual supplementation of defect information; it can also display the retrieved strip elongation, the actual location of the defect, and the current speed information of the rolling mill, enabling operators to grasp important data in a timely manner and facilitating the operation and management of the rolling mill defect control system.

[0016] Preferably, the data processing module calculates the actual location of the defect after rolling according to the following formula: , in, This represents the actual location of the defect on the strip after the current rolling pass; This represents the initial location of the defect on the strip before the current rolling pass. This refers to the current strip elongation rate retrieved from the elongation rate database.

[0017] By adopting the above technical solution, the actual position of the defect in the strip after rolling in the current rolling pass can be accurately calculated based on the initial defect position and the strip elongation, providing an accurate basis for subsequent mill deceleration control.

[0018] Preferably, the data processing module is configured to calculate the position of the defect after reversal based on the actual position calculated in the current pass, according to the principle that the strip's rolling direction is opposite in two adjacent passes. The calculation formula is as follows: , in, This indicates the actual location of the defect in the next rolling pass. The total length of the strip after rolling is obtained based on the strip's moving speed and position monitored by the first encoder and the second encoder after the strip is uncoiled. This represents the actual location of the defect on the strip after the current rolling pass.

[0019] By adopting the above technical solution, based on the principle that the rolling directions of two adjacent strip passes are opposite, the actual position of the defect calculated in the current pass can be used, combined with the total length of the strip obtained by the first encoder and the second encoder after the strip is uncoiled, to calculate the position of the defect after reversal, thereby accurately determining the position of the defect in different rolling passes and providing a precise positional basis for defect control of the rolling mill.

[0020] The present invention provides a mill defect control method combining elongation correction and multi-stage deceleration, which adopts the following technical solution: A method for controlling defects in rolling mills that combines elongation correction and multi-stage deceleration includes the following steps: The first encoder installed on the strip reel and the second encoder installed on the plate roll jointly monitor the moving speed and position of the strip. The two encoders are mutually calibrated to reduce measurement errors caused by slippage and deviation, and the running length and position information of the strip are collected in real time. Based on the current strip steel type and rolling pass, retrieve the corresponding strip steel elongation from the pre-stored elongation database; Obtain the initial defect location of the strip, and calculate the actual location of the defect after the current rolling pass based on the initial defect location and the retrieved strip elongation. Set the deceleration start threshold and recovery speed threshold according to the actual location of the defect; When the real-time position of the strip reaches the deceleration start threshold, a deceleration command is sent to the rolling mill drive system; When the real-time position of the strip reaches the recovery speed threshold, a recovery speed command is sent to the rolling mill drive system.

[0021] By adopting the above technical solution, two encoders are used to jointly monitor the moving speed and position of the strip, and mutual correction reduces measurement errors. This enables accurate and real-time acquisition of the strip's running length and position information. The corresponding strip elongation can be retrieved from the pre-stored elongation database to quickly obtain the required data. The actual position of the defect after the current rolling pass is calculated based on the initial defect position and elongation, allowing for precise defect location. Deceleration and recovery speed thresholds are set according to the actual defect position, and instructions are sent when the real-time position of the strip reaches the corresponding threshold. This enables precise control of the mill speed and reduces the impact of defects on the rolling process.

[0022] The present invention also provides a computer device using the following technical solution: A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method of claim 8.

[0023] By adopting the above technical solution, the computer equipment can control mill defects by combining elongation correction and multi-stage deceleration strategies. The first and second encoders jointly monitor the strip speed and position and correct each other to reduce measurement errors and accurately collect strip running length and position information. It can retrieve the corresponding elongation rate according to the strip type and rolling pass. It can obtain the initial defect position of the strip and calculate the actual defect position by combining it with the elongation rate. It can set deceleration and recovery speed thresholds according to the actual defect position and send deceleration and recovery speed commands to the mill drive system in a timely manner to achieve reasonable control of the mill running speed, thereby improving the strip rolling quality and production safety.

[0024] In summary, the present invention has the following beneficial effects: 1. The strip length detection module uses the first encoder and the second encoder to mutually calibrate, reducing measurement errors caused by slippage and deviation, and can accurately collect the running length and position information of the strip in real time; the elongation rate retrieval module can directly retrieve the corresponding target elongation rate according to the current strip type and rolling pass; the data processing module combines the initial defect location and the target elongation rate to calculate the actual position of the defect in the strip after rolling in the current rolling pass, which solves the problem that the actual position of the defect cannot be quickly calculated in the existing technology; 2. The control module sets the deceleration start threshold and recovery speed threshold according to the actual location of the defect, and sends deceleration or recovery speed commands to the rolling mill drive system. This avoids the problem of excessive deceleration in the non-defect area of ​​the strip or incomplete treatment in the defect area due to human error, thereby improving production efficiency and defect repair effect. Attached Figure Description

[0025] Figure 1 This is a structural block diagram of a rolling mill defect control system that combines elongation correction and multi-stage deceleration.

[0026] Figure 2 This is a flowchart of a mill defect control method that combines elongation correction and multi-stage deceleration. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0028] In the description of the embodiments of this application, the words "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Rather, the use of the words "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0029] In the description of the embodiments of this application, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized. Example 1

[0030] A mill defect control system combining elongation correction and multi-stage deceleration, referring to Figure 1 The system comprises a strip length detection module, an elongation retrieval module, a defect location module, a data processing module, and a control module. The strip length detection module, elongation retrieval module, and defect location module are all electrically connected to the data processing module, which in turn is electrically connected to the control module. The control module is then electrically connected to the mill's drive system. This interconnectivity allows for coordinated operation among the modules, enabling precise control of mill defects. The strip length detection module accurately collects the strip's running length and position information; the elongation retrieval module provides accurate elongation data; the defect location module determines the initial defect location; the data processing module calculates the actual defect location based on this information; and the control module controls the mill's deceleration and recovery speed according to the actual location. This improves the accuracy of defect handling and production efficiency.

[0031] Reference Figure 1The strip length detection module includes a first encoder and a second encoder. The first encoder is fixedly connected to the strip reel, which is used to hold the strip coil and drive it to release the strip. The strip reel is driven to rotate by a first motor and a first reducer. The first encoder is an incremental encoder that outputs the rotation information of the strip reel in the form of pulse signals. It has a compact structure, is easy to install, and can be securely connected to the strip reel via couplings and other components.

[0032] Reference Figure 1 The second encoder is fixedly connected to the strip roll of the rolling mill. It can also be an incremental encoder to monitor the rotation of the strip roll. Its installation method can be selected according to the structural characteristics of the strip roll, such as flange mounting. The first and second encoders jointly monitor the moving speed and position of the strip. They correct each other, reducing errors caused by slippage between the strip and the coil / strip roll, as well as measurement deviations. When there is a deviation between the strip movement distance detected by the first encoder and that detected by the second encoder, the system will adjust accordingly.

[0033] The first encoder is used to calculate the angular velocity of the steel coil. Considering the reduction ratio G (for every G revolutions of the motor shaft, the output shaft rotates 1 revolution), the formula for calculating the angular velocity is: , in, Angular velocity of the steel coil (unit: rad / s); The change in pulse count over a set time period; This represents the time interval corresponding to the change in pulse count; Represents the arc of one circle; This represents the number of pulses per revolution of the first encoder.

[0034] The formula for calculating the first linear velocity of the strip is: , in, The first linear velocity of the strip (unit: m / s); The current diameter of the strip (unit: m); ω represents the angular velocity of the steel coil.

[0035] The second encoder is used to calculate the angular velocity of the plate roll. The plate roll does not have a speed reduction device; its angular velocity is calculated using the following formula: , in, Angular velocity of the plate roller (unit: rad / s); The change in pulse count of the second encoder within a set time period; For the corresponding time interval; Represents the arc of one circle; This represents the number of pulses per revolution of the second encoder.

[0036] The formula for calculating the second linear velocity of the strip is: , in, This is the second linear velocity of the strip. The diameter of the plate roller; ω represents the angular velocity of the plate roller.

[0037] The actual linear velocity of the steel strip advancing on the rolling mill is taken as the average value, and the calculation formula is as follows: , in, This represents the actual linear velocity of the steel strip advancing on the rolling mill. The first linear velocity of the strip; This is the second linear velocity of the strip.

[0038] The actual transport length of the strip steel is obtained as follows: , in, This refers to the actual transport length of the strip steel; For the first The speed of the next measurement; For the next speed measurement; This represents the time interval for each measurement.

[0039] After the strip is uncoiled, the total length of the strip in the current pass can be calculated using the formula above.

[0040] Reference Figure 1 The elongation retrieval module pre-stores an elongation database corresponding to the strip type and rolling pass. This module can be a combination of a storage device (e.g., hard drive, flash memory) and a processing chip. The storage device stores the elongation data, while the processing chip retrieves the target elongation from the database based on the current strip type and rolling pass. For example, when the strip type is A and the rolling pass is 3, this module can quickly find the corresponding elongation data in the database.

[0041] Reference Figure 1The defect location module includes a high-definition camera and a fluorescent unit. The fluorescent unit enhances the image contrast of defects on the strip surface; it can be a special fluorescent lamp installed above the strip, emitting light of a specific wavelength to make defects more clearly visible. The high-definition camera captures edge cracks and / or burrs on the strip surface in oil-mist environments. It features high resolution and good anti-interference capabilities. An industrial-grade high-definition camera can be used, installed at a suitable location on the strip, such as on either side or above it, to ensure a clear image of the strip surface. The high-definition camera sends the detected defect location information as the initial defect location to the data processing module.

[0042] Reference Figure 1 The data processing module is electrically connected to the defect location module and the elongation retrieval module. It can be a computer motherboard with data processing capabilities, including components such as a processor and memory. The data processing module receives the initial defect location and the target elongation, and then processes the data according to the formula... The actual location of the defect in the strip after the current rolling pass is calculated, where, This refers to the length of the strip after the current rolling pass. This refers to the length of the strip before the current rolling pass. Based on the current track The values ​​are the same; This represents the extension rate for the current track.

[0043] Furthermore, the data processing module can also calculate the location of the defect after reversal based on the principle that the strip's rolling direction is opposite in two adjacent passes, and the actual position calculated for the current pass. The calculation formula is as follows: , in, This indicates the actual location of the defect in the next rolling pass. This represents the actual location of the defect on the strip after the current rolling pass; This refers to the total length of the strip after rolling, after the strip is uncoiled. The value is the total length of the current track.

[0044] For example, given that the initial defect location is 30 meters, the strip elongation is 30% (elongation is calculated as a decimal, e.g., 30% is 0.3), and the total strip length after the current pass is 130 meters, then first calculate the rolled length corresponding to the initial defect location as 30 × (1 + 0.3) = 39 meters. Then determine the defect location on the strip in the current pass as 130 - 39 = 91 meters. (Refer to...) Figure 1The control module is electrically connected to the data processing module and the rolling mill drive system, and it can be a programmable logic controller (PLC). The control module receives the actual location of the defect, sets the deceleration start threshold and recovery speed threshold based on the actual location of the defect, and sends deceleration commands or recovery speed commands to the rolling mill drive system based on the real-time position of the strip.

[0045] The control module is configured to execute a multi-level deceleration strategy. At a first distance before the actual location of the defect, the rolling mill is controlled to begin deceleration; at a second distance before the actual location of the defect, the rolling mill speed is controlled to decrease to a preset safe speed range, wherein the second distance is less than the first distance.

[0046] For example, if the first distance is set to 15 meters and the second distance to 10 meters, when the strip is rolled to a distance of 15 meters from the actual location of the defect, the mill begins to decelerate. When the distance reaches 10 meters from the actual location of the defect, the mill speed drops to a preset safe speed range. If the defect is located at 91 meters on the strip in the current pass, the deceleration start threshold is at 91-15=76 meters.

[0047] Meanwhile, the control module is also used to control the mill to gradually accelerate at the third distance after the actual location of the defect has passed; and to control the mill to return to its original speed at the fourth distance after the actual location of the defect has passed, so as to ensure the continuity and stability of the production process.

[0048] For example, when the actual location of the defect is 10 meters from the mill, the mill begins to accelerate. When it reaches 15 meters from the actual location of the defect, the mill moves forward at full speed to improve work efficiency. If the defect is located at 91 meters on the strip in the current pass, the recovery speed threshold is 91 + 15 = 106 meters after the defect location.

[0049] Reference Figure 1 The rolling mill defect control system also includes an operation interaction module, which is electrically connected to the control module. The operation interaction module allows operators to input the initial defect location and displays retrieved strip elongation, the actual location of the defect, and the current speed information of the rolling mill. The operation interaction module uses a combination of a touchscreen display and an input keyboard. Operators can input the initial defect location via the keyboard, and the touchscreen display shows relevant information in real time, allowing operators to easily understand the system's operating status.

[0050] The implementation principle of this embodiment is as follows: The rolling mill defect control system accurately acquires the running length and position information of the strip through the strip length detection module, the elongation retrieval module provides accurate elongation data, the defect location module determines the initial defect position, the data processing module accurately calculates the actual position of the defect based on this information, and the control module implements multi-stage deceleration and recovery speed control based on the actual position. This collaborative working method avoids the problems of untimely defect handling or excessive deceleration caused by the lack of accurate position positioning and human error in traditional methods, thereby improving the effect of defect handling and production efficiency, and enhancing the stability and reliability of the system.

[0051] The addition of the interactive module allows operators to directly participate in the system's control process. By inputting the initial defect location, the accuracy of defect location is further improved. Simultaneously, real-time information displays enable operators to monitor the system's operation, facilitating adjustments based on actual conditions. This enhances the system's operability and flexibility, further improving production efficiency and defect handling effectiveness. Example 2

[0052] This application provides a method for controlling rolling mill defects that combines elongation correction and multi-stage deceleration, referring to... Figure 2 This includes the following steps: S1, through a first encoder mounted on the strip reel and a second encoder mounted on the strip roll, jointly monitors the moving speed and position of the strip. The two encoders mutually correct each other to reduce measurement errors caused by slippage and deviation, and collect the running length and position information of the strip in real time. During operation, the first and second encoders work continuously, transmitting the monitored signals to the data processing module. The data processing module processes and analyzes the signals to obtain accurate strip running information.

[0053] S2, based on the current strip steel type and rolling pass, retrieves the corresponding strip steel elongation from the pre-stored elongation database. The elongation database is stored in a storage device, and the data processing module searches for and retrieves the corresponding elongation data from the database based on the relevant information of the current strip steel.

[0054] S3: Obtain the initial defect location of the strip and, based on the initial defect location and the retrieved strip elongation, calculate the actual location of the defect after the current rolling pass. The initial defect location is obtained through the defect location module, and the data processing module uses a formula... Calculate the actual location of the defect.

[0055] S4 sets the deceleration start threshold and recovery speed threshold based on the actual location of the defect. The control module sets appropriate deceleration start threshold and recovery speed threshold based on the actual location of the defect, combined with production process and equipment requirements.

[0056] S5: When the real-time position of the strip reaches the deceleration start threshold, a deceleration command is sent to the mill drive system. The real-time position of the strip is monitored in real time by the strip length detection module. When the deceleration start threshold is reached, the control module sends a deceleration command to the mill drive system, causing the mill to begin deceleration.

[0057] S6: When the real-time position of the strip reaches the recovery speed threshold, a recovery speed command is sent to the mill drive system. When the real-time position of the strip reaches the recovery speed threshold, the control module sends a recovery speed command to the mill drive system, causing the mill to gradually return to its original speed.

[0058] The implementation principle of this embodiment is as follows: This control method achieves precise control of the rolling mill by accurately collecting strip running information, retrieving elongation data, locating defect positions, calculating the actual defect positions, and reasonably setting deceleration and recovery speed thresholds. This avoids problems such as untimely defect handling or excessive deceleration caused by a lack of precise positioning and human error in traditional control methods, improving the effectiveness of defect handling and production efficiency, and ensuring the rolling quality of the strip. Example 3

[0059] This application also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of a mill defect control method combining elongation correction and multi-stage deceleration. The memory can be a storage device such as a hard disk or solid-state drive, used to store the computer program and related data. The processor can be a central processing unit (CPU) responsible for executing the computer program. When the processor executes the program, it implements the steps of a mill defect control method combining elongation correction and multi-stage deceleration. This computer device processes and analyzes data collected by the strip length detection module, elongation retrieval module, and defect location module by running the corresponding program, and controls the control module to control the deceleration and recovery speed of the mill.

[0060] The implementation principle of this embodiment is as follows: by combining the hardware and software of the computer equipment, each step of the rolling mill defect control method can be automatically executed, improving the accuracy and efficiency of control. The computer equipment can process data such as strip length, elongation, and defect location in real time, and control the deceleration and recovery speed of the rolling mill according to preset algorithms and strategies, reducing human error and improving the quality and efficiency of strip production. Compared with the prior art, this represents a significant advancement in automated control.

[0061] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A mill defect control system combining elongation correction and multi-stage deceleration, characterized in that, include: The strip length detection module includes a first encoder and a second encoder. The first encoder is connected to the strip roll, and the second encoder is connected to the strip roll. The strip length detection module is used to monitor the moving speed and position of the strip through the first encoder and the second encoder, and to reduce the measurement error caused by slippage and deviation through mutual correction, so as to collect the running length and position information of the strip in real time. The elongation rate retrieval module has a pre-stored elongation rate database corresponding to the strip steel type and rolling pass, which is used to directly retrieve the corresponding target elongation rate according to the current strip steel type and rolling pass. The defect location module is used to detect and obtain the initial defect location of the strip steel. The data processing module is electrically connected to the strip length detection module, the elongation retrieval module, and the defect location module. It is used to receive the initial defect location and the target elongation, and to calculate the actual position of the defect in the strip after the current rolling pass based on the initial defect location and the target elongation. as well as The control module is electrically connected to the data processing module and the rolling mill drive system, respectively. It is used to receive the actual location of the defect, set the deceleration start threshold and recovery speed threshold according to the actual location of the defect, and send deceleration command or recovery speed command to the rolling mill drive system according to the real-time position of the strip.

2. The mill defect control system combining elongation correction and multi-stage deceleration according to claim 1, characterized in that: The control module is configured to execute a multi-level deceleration strategy, including: At a first distance before the actual location of the defect, the control mill begins to decelerate; At a second distance before the actual location of the defect, the mill speed is controlled to decrease to a preset safe speed range, wherein the second distance is less than the first distance.

3. A mill defect control system combining elongation correction and multi-stage deceleration according to claim 2, characterized in that: The control module is also configured to control the rolling mill to gradually accelerate back to its original speed at the third distance after the actual location of the defect has passed.

4. A mill defect control system combining elongation correction and multi-stage deceleration according to claim 1, characterized in that: The defect location module includes a high-definition camera and a fluorescence unit. The fluorescence unit is used to enhance the image contrast of defects on the strip surface. The high-definition camera is used to capture cracked edge defects and / or burr defects on the strip surface in an oil mist environment, and sends the detected defect location information as the initial defect location to the data processing module.

5. A mill defect control system combining elongation correction and multi-stage deceleration according to claim 1, characterized in that: It also includes an operation interaction module, which allows operators to input the initial defect location and displays the retrieved strip elongation, the actual location of the defect, and the current speed information of the rolling mill.

6. A mill defect control system combining elongation correction and multi-stage deceleration according to claim 1, characterized in that: The data processing module calculates the actual location of the defect after rolling according to the following formula: ， in, This represents the actual location of the defect on the strip after the current rolling pass; This represents the initial location of the defect on the strip before the current rolling pass. This refers to the current strip elongation rate retrieved from the elongation rate database.

7. A mill defect control system combining elongation correction and multi-stage deceleration according to claim 6, characterized in that: The data processing module is configured to: based on the principle that the rolling directions of two adjacent passes of the strip are opposite, and using the actual position calculated for the current pass, calculate the position of the defect after reversal. ， in, This indicates the actual location of the defect in the next rolling pass. The total length of the strip after rolling is obtained based on the strip's moving speed and position monitored by the first encoder and the second encoder after the strip is uncoiled. This represents the actual location of the defect on the strip after the current rolling pass.

8. A mill defect control method combining elongation correction and multi-stage deceleration, applied to the mill defect control system combining elongation correction and multi-stage deceleration as described in any one of claims 1 to 7, characterized in that, Includes the following steps: The first encoder installed on the strip reel and the second encoder installed on the plate roll jointly monitor the moving speed and position of the strip. The two encoders are mutually calibrated to reduce measurement errors caused by slippage and deviation, and the running length and position information of the strip are collected in real time. Based on the current strip steel type and rolling pass, retrieve the corresponding strip steel elongation from the pre-stored elongation database; Obtain the initial defect location of the strip, and calculate the actual location of the defect after the current rolling pass based on the initial defect location and the retrieved strip elongation. Set the deceleration start threshold and recovery speed threshold according to the actual location of the defect; When the real-time position of the strip reaches the deceleration start threshold, a deceleration command is sent to the rolling mill drive system; When the real-time position of the strip reaches the recovery speed threshold, a recovery speed command is sent to the rolling mill drive system.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method of claim 8.

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