Precise parking system for first pass of cold-rolled strip steel

Abstract

The invention relates to the technical field of cold-rolled strip steel, and discloses a cold-rolled strip steel first-pass precise parking system, which comprises an operation interface module, which is arranged in a rolling mill main operation room and an entrance cantilever platform, is provided with a trigger button, and is used for generating a delayed parking instruction after a welding seam is separated from an uncoiling machine mandrel; the linear speed calculation module is used for dynamically calculating the inlet real-time linear speed according to the main rolling mill linear speed reference value and the inlet and outlet real-time thickness data; the downtime calculation module is used for generating a downtime variable based on a preset downtime distance and the entrance real-time linear speed; and the TON delay module is used for controlling the rolling mill to execute precise shutdown, so that the error of the distance between the welding seam and the rolling mill roll gap is smaller than 0.2 m. Through the linkage control of the trigger button of the operation interface module and the TON delay module, the shutdown time is accurately calculated by using the real-time linear speed of the inlet and the preset shutdown distance, the yield of the cold-rolled strip steel is improved, the waste of raw materials is effectively reduced, and the production benefit is improved.

Description

Technical Field

[0001] This invention relates to the field of cold-rolled strip steel technology, specifically to a precision stopping system for the first pass of cold-rolled strip steel. Background Technology

[0002] Cold-rolled strip steel production is a crucial step in steel processing. During the first rolling pass, precise control of the stop position at the strip weld directly impacts yield and production stability. In a cold-rolling production line, after the steel coil is uncoiled, it passes sequentially through imported end-plate rolls, scraper rolls, and the rolling mill. Each coil has a guide strip welded to its front end. During the first rolling pass, after the weld between the guide strip and the finished strip separates from the coiler mandrel, precise control is needed to maintain a reasonable distance between the weld and the rolling mill roll gap to avoid wasting raw materials due to excessively long unrolled sections.

[0003] The steel coil is uncoiled, and the strip steel is passed sequentially through a set of inlet end profile rolls, at least one set of inlet end scraper rolls, a 20-roll mill, at least one set of outlet end scraper rolls, and another set of outlet end profile rolls. A thickness gauge is installed between the scraper rolls and the profile rolls to measure the thickness of the steel strip. The 20-roll mill rolls the steel strip. A fixed-length scrap steel strip is welded to the front end of each steel coil. The operator passes the scrap steel strip through the gap of the inlet end profile rolls and presses the equipment start button to allow the steel strip to enter the mill for rolling.

[0004] However, there is a blind spot after the strip enters the oil scraper, and the machine can only be stopped manually based on the operator's experience. The distance between the weld and the mill roll gap is about 1.5 meters, which seriously affects the yield. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a precise stopping system for the first pass of cold-rolled strip steel, which solves the problem that manual operation is affected by visual blind spots and differences in experience, resulting in large fluctuations in the distance between the weld and the mill roll gap, making it impossible to guarantee the consistency of the stopping position.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precision stopping system for the first pass of cold-rolled strip steel, comprising: The operation interface module is located in the main control room of the rolling mill and the entrance cantilever platform. It is equipped with a trigger button to generate a delayed stop command after the weld seam is separated from the mandrel of the coiler. The linear velocity calculation module is used to dynamically calculate the real-time linear velocity at the inlet based on the main mill linear velocity reference value and the real-time thickness data at the inlet and outlet. The downtime calculation module generates downtime variables based on a preset downtime distance and the real-time linear velocity of the inlet; The TON delay module receives the delayed stop command and the stop time variable, and controls the mill to perform a precise stop, so that the distance error between the weld and the mill roll gap is less than 0.2 meters.

[0007] By adopting the above technical solution, the operation interface module set in the main control room of the rolling mill and the entrance cantilever platform automatically detects the position of the weld seam after it detaches from the mandrel of the coil and generates a delayed stop command. The linear speed calculation module dynamically calculates the real-time linear speed at the entrance based on the main rolling mill linear speed reference value and the real-time thickness data at the entrance and exit. Then, the stop time calculation module generates a stop time variable with millisecond precision after Kalman filtering correction based on the preset stop distance and the real-time linear speed. Finally, the TON delay module receives the command and the time variable, and links the PLC control module and the rolling mill drive device to perform multi-stage S-shaped deceleration stop. The error is corrected in real time through closed-loop feedback of the laser displacement sensor, so that the error between the weld seam and the roll gap is less than 0.2 meters. Compared with the traditional solution, the unrolled section of a single coil is reduced by 1.3 meters, and the yield is increased by 8%-12%. It realizes fully automatic and precise stop control of the first rolling pass, eliminates the defects of manual intervention, and significantly improves production stability.

[0008] Preferably, the trigger button is a photoelectric sensor button, configured to automatically detect the weld position and generate a trigger signal.

[0009] Preferably, the stopping distance is a fixed distance between the inlet end plate roll and the mill roll gap, with a value range of 1.0-1.5 meters.

[0010] Preferably, the linear velocity calculation module includes: Inlet and outlet thickness sensors are used to collect strip thickness data in real time; The calculation unit dynamically adjusts the inlet linear velocity based on the thickness difference and the linear velocity reference value.

[0011] Preferably, the delay time of the TON delay module is calculated using the following formula: Where T is the delay time, D is the stopping distance, and V is the real-time linear velocity at the inlet.

[0012] Preferably, the system further includes a PLC control module, which is linked with the rolling mill drive device to achieve precise shutdown under continuously variable speed conditions.

[0013] A preferred method for precise stopping of the first pass of cold-rolled strip steel includes the following steps: The delayed stop command is generated after the weld seam is separated from the winding machine mandrel by the trigger button of the operation interface module; Real-time acquisition of strip thickness data at the inlet and outlet, combined with linear velocity reference values ​​to calculate the real-time linear velocity at the inlet; The shutdown time variable is generated based on the preset shutdown distance and the real-time linear velocity at the entrance. The TON delay module is used to perform a delay operation, which controls the rolling mill to stop precisely after the downtime ends.

[0014] Preferably, the triggering conditions for the trigger button include: the weld position is automatically detected by a photoelectric sensor and a signal is generated.

[0015] Preferably, the downtime variable is dynamically adjusted in the following ways: When the real-time linear velocity fluctuation at the inlet exceeds a preset threshold, the downtime is recalculated based on the sliding window algorithm.

[0016] Preferably, the control error of the precise parking is corrected through a closed-loop feedback mechanism, including: Real-time monitoring of the actual distance between the weld and the roll gap; If the error exceeds 0.2 meters, a secondary calibration procedure is triggered to adjust the mill stop position.

[0017] This invention provides a precise stopping system for the first pass of cold-rolled strip steel. It has the following advantages: 1. This invention changes the existing technology of relying on operator experience for manual stopping by linking the trigger button of the operation interface module with the TON delay module. It uses the real-time linear velocity at the entrance and the preset stopping distance to accurately calculate the stopping time, so that the distance error between the weld and the mill roll gap is stably controlled within 0.2 meters, thereby improving the yield of cold-rolled strip steel, effectively reducing raw material waste, and improving production efficiency.

[0018] 2. This invention utilizes a laser displacement sensor to monitor the actual distance between the weld seam and the roll gap in real time, forming a closed-loop feedback mechanism. When the error exceeds 0.2 meters, a secondary calibration procedure is automatically triggered. The strip position is fine-tuned by briefly reversing the drive motor, and after a maximum of three iterations of fine-tuning, the error can be ensured to meet the requirements. Simultaneously, the system employs a dual-channel sensor redundancy design, which can automatically switch and trigger an alarm in the event of a single sensor failure. Under abnormal operating conditions, fault degradation processing can be achieved through techniques such as sliding window algorithms and LSTM neural network prediction, ensuring basic functionality. The system's false trigger rate is <0.01%, adapting to stable operation under complex working conditions.

[0019] 3. This invention automatically detects the weld position using an infrared photoelectric beam sensor. Once the weld detaches from the coiler mandrel, a delayed stop command is generated without manual intervention, and the mill drive and hydraulic braking system are activated to execute a multi-stage S-shaped deceleration stop. The entire process requires no manual operation, avoiding stopping deviations caused by blind spots and differences in operator experience, improving the stability and consistency of the production process, and reducing reliance on operator skills.

[0020] 4. This invention adopts a dual-channel sensor redundancy design, which can automatically switch and trigger an alarm when a single sensor fails. Under abnormal operating conditions, fault degradation processing can be achieved through technologies such as sliding window algorithm and LSTM neural network prediction to ensure basic functions. The system false trigger rate is <0.01%, which can adapt to stable operation under complex operating conditions. Attached Figure Description

[0021] Figure 1 This is a diagram illustrating the architecture of a precision stopping system for the first pass of cold-rolled strip steel according to the present invention. Figure 2 This is a schematic diagram of the delayed parking procedure of the present invention; Figure 3 This is a schematic diagram illustrating the function of the ton module of the present invention; Figure 4 This is a flowchart of a method for precise stopping of the first pass of cold-rolled strip steel according to the present invention. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides a first-pass precision stopping system for cold-rolled strip steel, comprising: an operation interface module, located in the main control room of the mill and the entrance cantilever platform, equipped with a trigger button for generating a delayed stopping command after the weld seam detaches from the mandrel of the coiler; The linear velocity calculation module is used to dynamically calculate the real-time linear velocity at the inlet based on the main mill linear velocity reference value and the real-time thickness data at the inlet and outlet. The downtime calculation module generates downtime variables based on a preset downtime distance and the real-time linear velocity of the inlet; The TON delay module receives the delayed stop command and the stop time variable, and controls the mill to perform a precise stop, so that the distance error between the weld and the mill roll gap is less than 0.2 meters.

[0024] Specifically, the operation interface module is set in the main control room console and the entrance cantilever control panel of the rolling mill, and is equipped with a visual human-machine interaction interface; the interface integrates a trigger button, and the position of the weld is monitored in real time through photoelectric sensors. When the weld is completely separated from the mandrel of the coiler, the operator triggers the button to generate a delayed stop command. The trigger signal communicates and links with the rolling mill PLC system to ensure the real-time transmission of instructions.

[0025] The linear velocity calculation module dynamically collects the main mill linear velocity setpoint, real-time thickness data from the inlet thickness gauge, and feedback data from the outlet thickness gauge. Based on the principle of mass flow conservation, using the formula: Where H 入口 H represents the thickness of the inlet strip. 出口 V represents the thickness of the exported strip steel. 设定 This serves as a reference value for the mill line speed; the calculation results are transmitted to the central controller via the industrial bus as the basic parameters for calculating downtime.

[0026] The downtime calculation module is preset with a downtime distance of 1.5 meters (the fixed distance between the inlet end plate roll and the mill roll gap) as the downtime distance, combined with the real-time inlet linear velocity V. 入口 According to the formula: Dynamically generate downtime variables, where D 预设 The preset stopping distance (m) is the mechanical distance between the inlet end plate roll and the mill roll gap, calibrated to a fixed value (1.5 meters) using a laser rangefinder. V 入口 The dynamic input linear velocity (m / s) from the linear velocity calculation module is used to monitor the strip tension fluctuation in real time. The time variable is corrected by the Kalman filter algorithm to eliminate the error caused by instantaneous speed fluctuations. The time variable is output to the TON delay module with accuracy controlled at the millisecond level.

[0027] The TON delay module uses the TON (TimerOnDelay) function block built into the programmable logic controller (PLC) to receive the shutdown time variable and the delay stop command. After being triggered, it precisely controls the mill drive motor to decelerate and stop according to the calculated time, and synchronously links the hydraulic braking system to ensure a smooth shutdown process. By using a laser displacement sensor to provide real-time feedback on the distance between the weld and the roll gap, a closed-loop control is formed, resulting in a final distance error of less than 0.2 meters, a reduction of 1.3 meters in the length of the unrolled section per coil, and an increase in yield of 8%-12%.

[0028] System coordination mechanism: After the operation interface module triggers the command, the linear velocity calculation module updates the entry velocity in real time, the shutdown time calculation module synchronously corrects the time parameters, and the TON module executes precise shutdown. The entire process requires no manual intervention. Through data fusion and closed-loop feedback, fully automatic control is achieved, solving the parking deviation problem caused by relying on experience in the existing technology.

[0029] The trigger button is a photoelectric sensor button, configured to automatically detect the weld position and generate a trigger signal; the stopping distance is a fixed distance between the inlet end plate roll and the mill roll gap, with a value range of 1.0-1.5 meters.

[0030] Specifically, the photoelectric induction trigger button uses an infrared photoelectric through-beam sensor, installed 0.5 meters behind the uncoiler mandrel at a 45° angle to the strip axis. It monitors the intensity of reflected light from the strip surface in real time via a transmitter-receiver. When the weld seam passes through the detection area, a sudden change in light intensity triggers a signal. After PLC logic determination, a delayed stop command is generated, and the signal is transmitted via the Profinet protocol. The sensor incorporates a digital filtering algorithm to shield against interference from oil stains, scratches, etc., and uses dual-channel redundant detection and three-level access control to prevent accidental triggering. Trigger records are stored in the PLC log in real time, supporting full lifecycle traceability. The false trigger rate is <0.01%, suitable for high-speed rolling (5m / s) conditions.

[0031] The stopping distance is the fixed distance between the centerline of the inlet end plate roll and the centerline of the mill roll gap, nominal value D. 预设 =1.5m, the process adjustable range is 1.0-1.5m. During calibration, a laser rangefinder is used to measure the actual distance. Through low-speed trial run (0.3m / s), it is finely adjusted to the weld-roll gap distance ≤0.2m.

[0032] The linear velocity calculation module includes: Inlet and outlet thickness sensors are used to collect strip thickness data in real time; The calculation unit dynamically adjusts the inlet linear velocity based on the thickness difference and the linear velocity reference value.

[0033] Specifically, the linear velocity calculation module consists of an inlet thickness sensor, an outlet thickness sensor, and an intelligent computing unit, enabling dynamic and precise control of the strip linear velocity. A laser thickness gauge is used at the inlet side, installed 1.2 meters behind the inlet end roll, to collect the strip inlet thickness H in real time at a frequency of 1000Hz. 入口 An X-ray thickness gauge (accuracy ±0.002mm) is installed on the outlet side, located 0.8 meters in front of the outlet scraper roller, to simultaneously acquire the outlet thickness H. 出 The system incorporates a built-in temperature drift compensation algorithm to eliminate rolling thermal deformation interference. The computing unit receives data from two sensors via the EtherCAT bus, combining it with the linear speed setpoint V issued by the main mill. 设定 (0.5-5m / s), based on the principle of mass flow conservation, and simultaneously introducing a thickness difference feedback compensation mechanism (△H=H). 入口 -H 出口 When ΔH > 0.1 mm, the adaptive PID correction algorithm is triggered to adjust the inlet linear velocity. Where: K p K i K dThese are proportional, integral, and derivative coefficients, dynamically optimized based on the strip material (e.g., carbon steel, stainless steel). The integral term eliminates steady-state errors, and the derivative term suppresses oscillations caused by sudden thickness changes. To avoid tension imbalance, the calculation results are used to control the inlet pinch roll motor in real time via the PROFINET bus, achieving millisecond-level synchronization with the mill PLC. The module integrates a feedforward-feedback composite control strategy: the feedforward end pre-adjusts the speed based on a formula, and the feedback end uses the encoder's measured value V... 实测 Perform closed-loop compensation, the closed-loop compensation is: V 修正 =V 入口 +K p ×(V 实测 -V 入口 ), proportionality coefficient K p Dynamic optimization is performed based on the strip material. In abnormal situations (such as sensor failure), it automatically switches to the historical data prediction mode based on LSTM neural network and triggers a three-level audible and visual alarm, improving system robustness by 40% and stabilizing the linear speed control error within ±0.03m / s.

[0034] The delay time of the TON delay module is calculated using the following formula: Where T is the delay time, D is the stopping distance, and V is the real-time linear velocity at the inlet.

[0035] Specifically, the stopping distance D is a fixed value, preset through the human-machine interface (HMI), with a range of 1.0-1.5 meters. The specific value is adjusted according to the strip specifications. The real-time linear velocity V at the inlet is calculated based on the following formula: Where: V ref H is the preset linear speed reference value for the rolling mill. in The thickness of the entry strip is measured in real time by a laser thickness gauge, H. out The thickness of the exported strip is collected in real time by an X-ray thickness gauge. After the machine stops, the actual distance between the weld and the roll gap is detected by a laser rangefinder. If the error exceeds 0.2 meters, the jog mode (micro speed 0.01 m / s) is activated to adjust the position of the strip. This module is integrated into the PLC control system and supports PROFINET / EtherCAT protocol communication. Combined with sensor closed-loop feedback and interpolation algorithm, it significantly improves the yield and has the flexibility to dynamically adapt to different strip specifications.

[0036] The system further includes a PLC control module, which is linked with the rolling mill drive device to achieve precise shutdown under continuously variable speed conditions.

[0037] Specifically, a Siemens S7-1500 series programmable logic controller (PLC) is used, equipped with high-speed digital input / output modules and analog input modules. It communicates in real-time with the rolling mill drive unit (such as a Siemens G120 frequency converter), hydraulic braking system, and host computer via PROFINET industrial Ethernet. Based on dynamic linear velocity (0.5-5 m / s) and a preset stopping distance (1.5 m), the PLC's built-in algorithm generates a multi-segment S-shaped deceleration curve, combined with feedback from a laser displacement sensor regarding the weld-roll gap error (target value ≤ 0.2 m). The system dynamically adjusts the motor torque output through closed-loop PID control and links the hydraulic braking system to apply progressive braking force at low speeds (<0.3m / s). Simultaneously, it employs a dual-channel sensor redundancy design and a fault degradation mode to ensure basic functionality under abnormal operating conditions. The system self-tunes PID parameters using a genetic algorithm to match different rolling conditions, ultimately achieving millimeter-level stopping accuracy (error <0.2m), reducing the unrolled section per coil by 1.3 meters, increasing yield by 8%-12%, and achieving a response time ≤50ms. It is suitable for high-speed, high-precision cold rolling production lines.

[0038] Please see the appendix Figure 4 A method for precise stopping of the first pass of cold-rolled strip steel includes the following steps: The delayed stop command is generated after the weld seam is separated from the winding machine mandrel by the trigger button of the operation interface module; Real-time acquisition of strip thickness data at the inlet and outlet, combined with linear velocity reference values ​​to calculate the real-time linear velocity at the inlet; The shutdown time variable is generated based on the preset shutdown distance and the real-time linear velocity at the entrance. The TON delay module is used to perform a delay operation, which controls the rolling mill to stop precisely after the downtime ends.

[0039] Specifically, the operation interface module is equipped with photoelectric induction trigger buttons. An infrared photoelectric through-beam sensor is installed 0.5 meters behind the uncoiler mandrel, at a 45° angle to the strip axis, to monitor changes in the light intensity on the strip surface in real time. When the weld passes through the detection area, a sudden change in light intensity triggers a signal. After PLC logic judgment, a delayed stop command is generated and transmitted to the PLC control module in real time via the PROFINET protocol, ensuring that the command delay is less than 10 milliseconds to avoid human error. A laser thickness gauge is installed 1.2 meters behind the inlet end roll at the inlet side, acquiring inlet thickness data in real time at a sampling frequency of 1000Hz. An X-ray thickness gauge is configured at the outlet side to synchronously acquire outlet thickness data. Combined with the main mill linear speed setpoint, the real-time linear speed at the inlet is dynamically calculated based on the mass flow conservation formula. When the difference between the inlet and outlet thickness exceeds 0.1 mm, an adaptive PID correction algorithm is triggered, dynamically optimizing the proportional, integral, and derivative coefficients according to the material to suppress the influence of tension fluctuations on the speed.

[0040] The preset stopping distance is calibrated to 1.5 meters using a laser rangefinder. The stopping time variable is calculated based on the real-time entry linear velocity, and a Kalman filter algorithm is introduced to eliminate instantaneous speed fluctuation errors. When the speed fluctuation exceeds a threshold, the average of the most recent 10 speed data sets is taken using a sliding window algorithm to recalculate the stopping time, ensuring time accuracy is controlled within 10 milliseconds. After receiving the stopping time variable, the PLC's built-in TON delay module generates a multi-segment S-shaped deceleration curve, smoothly reducing the drive motor from the current speed to zero. Simultaneously, the hydraulic braking system applies progressive braking force according to a preset pressure gradient during the low-speed phase. A laser displacement sensor monitors the weld seam and roll gap distance in real time at a frequency of 100Hz. If the error exceeds 0.2 meters, a secondary calibration procedure is triggered, and the strip position is finely adjusted by briefly reversing the drive motor until the error meets the requirements.

[0041] The system employs a dual-channel laser sensor redundancy design. In the event of a primary sensor failure, it automatically switches to the backup channel and triggers an audible and visual alarm. During communication interruptions, the PLC switches to a historical data prediction mode based on an LSTM neural network to ensure basic functionality. All control parameters, sensor data, and abnormal events are recorded on the PLC's SD memory card, supporting offline analysis and process optimization. Ultimately, the system achieves a weld-roll gap error of less than 0.2 meters, reduces the unrolled section per coil by 1.3 meters, and increases the yield by 8%-12%, meeting the demands of high-speed rolling at 5 meters per second.

[0042] The triggering conditions for the trigger button include: the weld position is automatically detected by a photoelectric sensor and a signal is generated; the downtime variable is dynamically adjusted in the following ways: When the real-time linear velocity fluctuation at the inlet exceeds a preset threshold, the downtime is recalculated based on the sliding window algorithm.

[0043] Specifically, the triggering conditions for the trigger button include: using an Omron E3Z-T61 infrared photoelectric sensor, installed 0.5 meters behind the uncoiler mandrel at a 45° angle to the strip axis, with the detection area covering a strip width ≤ 1600 mm; the sensor emits 850 nm infrared light and monitors the reflection intensity; when the weld passes through and the light intensity drops by ≥ 30%, a 24VDC digital signal is triggered; a built-in digital filtering algorithm (cutoff frequency 100Hz) shields against oil interference; and dual-channel redundant detection ensures a false trigger rate < 0.01%. The trigger logic requires the weld to be completely detached from the uncoiler mandrel and the signal to remain valid for ≥ 50 milliseconds. After being acquired by the PLC high-speed input module, a delayed stop command is generated. The trigger record includes a timestamp (accuracy ± 1 millisecond) and is linked to the rolling mill production mode to avoid misoperation.

[0044] When the real-time linear velocity fluctuation at the inlet exceeds ±0.1 m / s (adjustable threshold) and persists for ≥200 ms, it is recalculated based on the sliding window algorithm. The sliding window contains the 10 most recent velocity data sets (sampling interval 100 ms) to calculate the average velocity. And update downtime Simultaneously, Kalman filtering is introduced to suppress noise (measurement noise σ = 0.05 m / s, process noise σ = 0.02 m / s). After dynamic optimization of the Kalman gain, the speed calculation accuracy is ≤0.03 m / s. If the fluctuation threshold is triggered three times consecutively, the system automatically expands the window to 20 sets of data and uses an exponentially weighted moving average to improve anti-interference capability. The updated time variable is transmitted to the PLC's TON module in real time via PROFINET to control the deceleration process with 1 millisecond accuracy.

[0045] The anomaly handling mechanism includes: if either channel of the dual-channel sensor fails for more than 500 milliseconds, the backup channel is switched and a secondary alarm is triggered; in the event of a dual-channel failure, the system degrades to manual mode. If the PROFINET communication interruption exceeds 200 milliseconds, the PLC predicts the average speed based on the historical data of the most recent 5 seconds and generates a degraded version of the downtime protection function. Ultimately, the system achieves a downtime error of ≤0.5% and a weld-roll gap control accuracy of <0.2 meters under a speed fluctuation of ±0.1 m / s, adapting to high-speed rolling at 5 m / s and complex working conditions.

[0046] The control error of the precise parking is corrected through a closed-loop feedback mechanism, including: Real-time monitoring of the actual distance between the weld and the roll gap; If the error exceeds 0.2 meters, a secondary calibration procedure is triggered to adjust the mill stop position.

[0047] Specifically, a laser displacement sensor (resolution ±0.01 mm, sampling frequency 100 Hz) is used to monitor the distance between the weld and the roll gap in real time. The target distance is set at 1.45 meters, and Kalman filtering is applied (process noise Q = 0.1). 2 mm 2 The measurement noise R = 0.5 2 mm 2 After noise elimination, if the error persists beyond 0.2 meters and the mill speed is <1.0 m / s, a secondary calibration procedure is immediately triggered. The calibration process includes short-term reverse drive (speed 0.2 m / s, time calculated proportionally to the error), retesting and iterative fine-tuning (maximum 3 times, speed decreasing to 0.1 m / s each time), and emergency shutdown upon failure, recording the out-of-tolerance event. Through dual-sensor redundancy (switching time <200 ms) and LSTM neural network prediction (generating degraded shutdown time during communication interruptions), the system ultimately achieves a weld-roll gap error ≤0.2 meters, calibration response ≤800 ms, and a yield improvement of 8%-12%, adapting to the needs of high-speed rolling at 5 m / s and multi-material production.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision stopping system for the first pass of cold-rolled strip steel, characterized in that, include: The operation interface module is located in the main control room of the rolling mill and the entrance cantilever platform. It is equipped with a trigger button to generate a delayed stop command after the weld seam is separated from the mandrel of the coiler. The linear velocity calculation module is used to dynamically calculate the real-time linear velocity at the inlet based on the main mill linear velocity reference value and the real-time thickness data at the inlet and outlet. The downtime calculation module generates downtime variables based on a preset downtime distance and the real-time linear velocity of the inlet; The TON delay module receives the delayed stop command and the stop time variable, and controls the mill to perform a precise stop, so that the distance error between the weld and the mill roll gap is less than 0.2 meters.

2. The precision stopping system for the first pass of cold-rolled strip steel according to claim 1, characterized in that, The trigger button is a photoelectric sensor button, configured to automatically detect the weld position and generate a trigger signal.

3. The first-pass precision stopping system for cold-rolled strip steel according to claim 1, characterized in that, The stopping distance is a fixed distance between the inlet end plate roll and the roll gap of the rolling mill, with a value range of 1.0-1.5 meters.

4. The first-pass precision stopping system for cold-rolled strip steel according to claim 1, characterized in that, The linear velocity calculation module includes: Inlet and outlet thickness sensors are used to collect strip thickness data in real time; The calculation unit dynamically adjusts the inlet linear velocity based on the thickness difference and the linear velocity reference value.

5. The first-pass precision stopping system for cold-rolled strip steel according to claim 1, characterized in that, The delay time of the TON delay module is calculated using the following formula: Where T is the delay time, D is the stopping distance, and V is the real-time linear velocity at the inlet.

6. The first-pass precision stopping system for cold-rolled strip steel according to claim 1, characterized in that, The system further includes a PLC control module, which is linked with the rolling mill drive device to achieve precise shutdown under continuously variable speed conditions.

7. A method for precise stopping of the first pass in cold-rolled strip steel production, characterized in that, A precision stopping system for the first pass of cold-rolled strip steel, applicable to any one of claims 1-5, comprises the following steps: The delayed stop command is generated after the weld seam is separated from the winding machine mandrel by the trigger button of the operation interface module; Real-time acquisition of strip thickness data at the inlet and outlet, combined with linear velocity reference values ​​to calculate the real-time linear velocity at the inlet; The shutdown time variable is generated based on the preset shutdown distance and the real-time linear velocity at the entrance. The TON delay module is used to perform a delay operation, which controls the rolling mill to stop precisely after the downtime ends.

8. The method for precise stopping of the first pass of cold-rolled strip steel according to claim 7, characterized in that, The triggering conditions for the trigger button include: the weld position is automatically detected by a photoelectric sensor and a signal is generated.

9. The method for precise stopping of the first pass of cold-rolled strip steel according to claim 7, characterized in that, The downtime variable is dynamically adjusted in the following ways: When the real-time linear velocity fluctuation at the inlet exceeds a preset threshold, the downtime is recalculated based on the sliding window algorithm.

10. The method for precise stopping of the first pass of cold-rolled strip steel according to claim 7, characterized in that, The control error of the precise parking is corrected through a closed-loop feedback mechanism, including: Real-time monitoring of the actual distance between the weld and the roll gap; If the error exceeds 0.2 meters, a secondary calibration procedure is triggered to adjust the mill stop position.

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