Method and system for controlling specification transition tension of annealing furnace

Abstract

The invention belongs to the technical field of annealing furnace tension control, and relates to an annealing furnace specification transition tension control method and system, and the method comprises the following steps: obtaining the tension of each process section, calculating the tension difference of adjacent process sections as a first tension difference, and calculating the tension difference of strip steel before and after the same process section as a second tension difference; when any tension difference exceeds the threshold, the transition direction is determined according to the incoming material tension target and the outgoing material tension target; when the small tension of the adjacent process sections is switched to the large tension, the subsequent strip steel tension of the current process section is preferentially adjusted, otherwise, the forward strip steel tension of the next process section is preferentially adjusted, and if the threshold is still exceeded, the two sections of tension are synchronously adjusted in proportion; the tension of the same section is kept unchanged during large-to-small switching, and on the contrary, a subsequent strip steel tension instruction is issued when the weld joint reaches the next process section. According to the technical scheme, the tension difference of all the process sections is collected and calculated in real time, dynamic judgment of adjacent and same-section tension is achieved, specification transition tension is continuously coordinated, and precision and welding seam stability are improved.

Description

Technical Field

[0001] This invention belongs to the field of annealing furnace tension control technology, and specifically relates to a method and system for controlling the transition tension of an annealing furnace. Background Technology

[0002] In existing technologies, annealing furnaces typically rely on primary or secondary tension control systems during strip specification transitions. These systems maintain tension balance in the process section by adjusting the transmission speed and tension setpoint to meet the stable operation requirements of strips with different specifications. However, existing tension control methods have some significant shortcomings during specification transitions.

[0003] In existing methods, tension control logic is mostly based on static parameter settings and does not coordinate control for the dynamic tension difference characteristics when switching strip specifications. When the strip thickness or width changes significantly, the tension response of adjacent process sections lags, which can easily cause sudden increases or decreases in local tension, leading to strip vibration, weld fracture, and rapid stoppage in certain areas, affecting the overall stability of the annealing furnace. At the same time, the tension update of the strip before and after the same process section is not correlated with the weld operation position, resulting in premature or delayed command execution and secondary fluctuations.

[0004] Furthermore, existing control systems often correct tension differences with a fixed ratio or set value during specification transitions, without adaptive adjustments based on factors such as equipment transmission inertia and process temperature. This makes it difficult to maintain a reasonable tension gradient under dynamic conditions. Due to the lack of real-time trend prediction and closed-loop correction mechanisms, adjustment delays easily occur during tension changes, failing to meet the stability requirements of high-precision continuous annealing production.

[0005] It is evident that existing technologies often suffer from problems such as asynchronous tension adjustment during specification transitions, insufficient precision in tension difference control, and frequent tension disturbances during weld seam passage. These are the shortcomings of existing technologies.

[0006] In view of this, it is very necessary to provide a method and system for controlling the transition tension of an annealing furnace to solve the above-mentioned defects in the prior art. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art, such as asynchronous tension adjustment during specification transition, insufficient precision in tension difference control, and frequent tension disturbances during weld passage, by providing a method and system for controlling the tension during specification transition in an annealing furnace, thereby solving the aforementioned technical problems.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A method for controlling the transition tension of an annealing furnace includes the following steps: Obtain the tensions of each process section of the annealing furnace, calculate the first tension difference and the second tension difference. The first tension difference is the tension difference between adjacent process sections, and the second tension difference is the tension difference between the forward strip and the backward strip in the same process section; When the first tension difference or the second tension difference exceeds a preset threshold, based on the tension target relationship between the incoming material and the outgoing material, determine the transition direction as switching from small tension to large tension or from large tension to small tension; For adjacent process sections, when switching from small tension to large tension, preferentially adjust the tension of the backward strip in the current process section. When switching from large tension to small tension, preferentially adjust the tension of the forward strip in the next process section. If the first tension difference still exceeds the preset threshold after adjustment, synchronously adjust the tension of the backward strip in the current process section and the tension of the forward strip in the next process section according to a preset ratio; For the same process section, when switching from large tension to small tension, the tension within the section remains unchanged. When switching from small tension to large tension, when the weld reaches the next process section, issue a tension command for the backward strip.

[0009] Adopting the above technical solution, through the real-time acquisition and difference calculation of the tension states of each process section of the annealing furnace, the dynamic determination of the tension differences between adjacent process sections and within the same process section is realized, which can maintain the continuity and协调性 of the tension distribution during the gauge transition process, and meet the requirements of synchronous tension adjustment, improved control accuracy and smooth passing of the weld during the gauge transition stage.

[0010] Among them, by obtaining the tensions of each process section of the annealing furnace and calculating the first tension difference and the second tension difference, a tension monitoring foundation for multi-section linkage is formed, providing an accurate basis for subsequent determination of the transition direction and adjustment logic; by combining the tension target relationship between the incoming material and the outgoing material when the tension difference exceeds the threshold, a two-way judgment mechanism for switching from small tension to large tension and from large tension to small tension is constructed, realizing the intelligent identification of the transition direction; by setting a preferential adjustment logic and a proportional coordination adjustment logic for adjacent process sections respectively, a two-layer adjustment system of "preferential adjustment + synchronous coordination" is formed, enabling the tension to be transmitted between each process section with a stable gradient; by setting a delayed issuance mechanism triggered by the arrival of the weld for the scenario of switching from small tension to large tension in the same process section, the tension command is matched with the physical transition process, preventing fluctuations caused by early execution. Overall, this method realizes the precise coordination and continuous and smooth control of the tension during the gauge transition stage without changing the structure and control model of the annealing furnace.

[0011] Preferably, obtaining the tensions of each process section of the annealing furnace includes: collecting the tension data of each process section, identifying and smoothing and correcting abnormal fluctuations in the tension data, and calculating the tension change trend based on the corrected tension data within a continuous acquisition period.

[0012] This technical solution achieves the following technical effects by introducing an abnormal fluctuation smoothing correction mechanism and continuous periodic data calculation during the tension acquisition process: First, by smoothing and correcting abnormal fluctuation data, the impact of sensor jitter, local mechanical disturbances and sampling delay on the overall tension calculation is reduced, so that the input tension data remains continuous and reliable, thereby improving the calculation accuracy of the first tension difference and the second tension difference, providing stable data support for the correct determination of the transition direction, and ensuring that subsequent adjustment actions are executed based on accurate tension trends. Second, the formation of a continuous periodic tension change trend can reflect the dynamic tension status of each process section of the annealing furnace, avoid the fluctuation misjudgment caused by single-point data sampling, and make the tension adjustment command based on the trend result rather than the instantaneous value, thereby making the control logic more stable and forward-looking, and ensuring that the tension judgment result can be maintained continuously and consistently during the specification transition period. Third, by combining the abnormal correction results with the tension change trend, the control system can perform filtering and preprocessing once during the data input stage, reducing the number of frequent corrections to control commands, improving the coordination and execution efficiency of control response, further reducing the probability of tension abrupt changes in strip steel due to data fluctuations during the transition stage, and improving the overall stability of tension control during the transition of annealing furnace specifications.

[0013] As a preferred option, the preset threshold is adjusted according to the layout of each process section of the annealing furnace and the temperature difference of the strip steel. When the temperature difference of the strip steel increases, the preset threshold is increased.

[0014] This technical solution achieves the following technical effects by setting a preset threshold in relation to the layout of the annealing furnace process section and the temperature difference of the strip steel: First, by combining the structural characteristics of different process sections, the tension difference threshold is set differently so that the tension judgment criteria of sections near the heating zone, heat soaking zone and cooling zone match their thermal load and transmission inertia. This makes the tension adjustment more in line with the actual thermal stress change law and avoids frequent triggering of adjustment in some process sections due to a uniform threshold. Second, the threshold is dynamically adjusted according to the temperature difference of the strip steel, making the tension judgment more lenient when the temperature gradient is large and more sensitive when the temperature gradient is small. This balances tension stability and adjustment responsiveness, ensuring that the tension in the high-temperature section is not triggered by the instantaneous temperature difference and that the real tension fluctuation in the low-temperature section can be identified in a timely manner. Third, the logic of relating temperature difference to threshold is incorporated into the tension control strategy, enabling the system to have adaptive capabilities. It can automatically correct the threshold range under different specifications, speeds, and strip thicknesses, reducing manual intervention and improving the adaptability and accuracy of the control system in responding to tension anomalies during specification transitions.

[0015] As a preferred method, when determining the transition direction, the trend prediction of the tension target relationship between incoming and outgoing materials is performed, and the tension target change rate is judged based on the prediction result. When the tension target change rate is within the threshold range, the transition direction update logic is triggered.

[0016] This technical solution achieves the following technical effects by introducing a trend prediction and rate judgment mechanism for the incoming and outgoing material tension targets during the transition direction determination process: First, by using trend prediction analysis to analyze the historical changes and real-time fluctuation characteristics of the tension targets for incoming and outgoing materials, a curve of the direction and rate of change of the tension targets is formed. This avoids incorrect transition direction judgments due to differences in single targets, enabling the system to dynamically identify the true switching direction from low tension to high tension or from high tension to low tension based on trend results, thus maintaining the stability and accuracy of direction judgment. Second, the system determines the rate of change of the tension target based on the prediction results and triggers the update logic when the rate is within the threshold range. This enables the system to update the judgment results in advance when the specification transition is critical, reducing the control lag caused by the direction switching delay, synchronizing the tension adjustment with the process section status, and improving the response coordination during the transition phase. Third, by setting a rate threshold range, instantaneous changes caused by random fluctuations are filtered out, preventing the system from frequently updating the direction determination, maintaining the smoothness and consistency of the control logic, thereby reducing the tension disturbances caused by frequent switching, and ensuring that the control process remains stable and continuous in a dynamic environment. Fourth, this prediction and judgment mechanism transforms the transition direction update from passive triggering to active triggering based on rate changes, enhancing the system's ability to anticipate specification switching trends, achieving intelligent and adaptive direction determination in complex production rhythms, and improving the overall tension control reliability and accuracy of the annealing furnace specification transition process.

[0017] As a preferred option, the preset ratio is determined based on the ratio of transmission inertia of adjacent process sections, with a larger preset ratio corresponding to a process section with a larger transmission inertia.

[0018] This technical solution achieves the following technical effects by using the ratio of transmission inertia between adjacent process sections as the basis for setting a preset ratio: First, the proportional distribution during tension synchronization adjustment should conform to the dynamic response characteristics of the transmission system of each process section. Process sections with large transmission inertia have a slower rate of tension change due to their higher inertia. By assigning a larger preset ratio, the strip steel can be kept under balanced force during coordinated adjustment, preventing tension mismatch caused by response lag in high inertia sections. Second, the transmission inertia is introduced into the proportional setting logic, so that the control system has the ability to adapt to the structure. Under different furnace section lengths, roller diameters and drive power conditions, it can automatically match a reasonable tension adjustment range, thereby avoiding the problem of over- or under-adjustment of some process sections caused by a fixed ratio. Third, based on the inertia ratio setting ratio, the tension adjustment of adjacent process sections achieves dynamic coupling, forming a stable tension transmission chain during specification transition, so that the tension changes of each section maintain a linear relationship, reducing the impact and repeated energy compensation between transmission systems, and improving the continuity and mechanical coordination of annealing furnace operation. Fourth, by establishing a proportional mapping through the inertia ratio, the adjustment parameters of the control system are derived from the inherent characteristics of the equipment rather than empirical values, reducing reliance on manual parameter adjustment and ensuring the consistency and predictability of tension adjustment behavior in each process section during long-term operation, thereby improving the standardization and robustness of specification transition control.

[0019] As a preferred option, a dynamic compensation coefficient is calculated based on the changing trends of the tension of the forward and backward strips. The dynamic compensation coefficient is used to correct the preset ratio.

[0020] This technical solution calculates a dynamic compensation coefficient based on the changing trend of the tension of the strip steel in the preceding and following rows, and uses this coefficient to correct the preset ratio, achieving the following technical effects: First, by simultaneously analyzing the direction and rate of change of tension in the forward and backward strip, a trend coupling model is formed to make real-time corrections to the preset ratio, so that the ratio adjustment no longer depends on the initial setting, but can dynamically change according to the actual stress state of the strip, ensuring that the synchronous adjustment response of adjacent process sections is more coordinated, and preventing the tension control system from experiencing follow-up lag or overshoot fluctuations due to inertia differences. Second, the dynamic compensation coefficient is continuously updated with the trend change. When the tension increase and decrease rates are inconsistent, the proportional amplitude is automatically corrected so that the adjustment direction is consistent with the actual tension change direction. This avoids reverse correction and system oscillation caused by excessive proportion, and maintains the smoothness and predictability of the strip tension change curve, so that the annealing furnace maintains a stable tension transmission chain during specification transition. Third, combined with the trend calculation window, the system can achieve rolling updates. The system can adaptively adjust the compensation intensity according to the tension response characteristics under different strip thicknesses, speeds and temperatures, so that the proportional correction conforms to the real-time dynamic characteristics of the equipment, taking into account both the stability of the high inertia section and the sensitivity of the low inertia section, and improving the universal adaptability under different working conditions. Fourth, the introduction of dynamic compensation enables the control strategy to form a two-layer feedback structure that combines basic proportion and trend correction, reducing the reliance on manual experience settings, reducing the risk of proportion drift or compensation imbalance in long-term operation, and improving the long-term stability and maintainability of the annealing furnace specification transition tension control system.

[0021] Preferably, when the weld reaches the next process segment, a subsequent strip tension command is issued, including: when the weld reaches the next process segment, calculating the tension offset based on the tension change trend in the previous adjustment cycle, compensating for the tension offset, and issuing a subsequent strip tension command.

[0022] This technical solution achieves the following technical effects by calculating and compensating for the tension offset based on the tension change trend of the previous adjustment cycle when the weld reaches the next process section, and then issuing a subsequent strip tension command: First, by using the tension change trend in the previous adjustment cycle to calculate the offset, the control system can predict the direction and magnitude of tension change before the weld enters the next process section, thereby achieving pre-compensation, suppressing the tension jump at the moment the weld crosses the interface, avoiding sudden stretching or relaxation at the transition point, and ensuring stable passage of the weld area. Second, by combining the compensation amount with trend calculation, a dynamic correction mechanism is formed, which synchronizes the compensation behavior with the tension difference between process sections and the change of strip inertia. This avoids over-adjustment or response lag caused by fixed compensation values, and ensures that the subsequent strip tension command can be accurately matched with the actual tension change state, thus ensuring a continuous and smooth transition of tension during the weld process. Third, by issuing tension commands only when the weld seam is reached, the timing of control is directly correlated with the physical transition process, eliminating the control deviation caused by issuing commands in advance or delaying execution in the traditional way, reducing the accumulation of tension disturbances near the weld seam, and improving the stability of strip steel operation in the entire annealing furnace production rhythm. Fourth, by combining trend offset calculation with real-time compensation logic, the tension command issuance behavior is changed from timed triggering to event triggering based on trend judgment, which enhances the system's adaptability to the weld operation status and makes the control commands both real-time and targeted, thereby maintaining the stability and continuity of annealing furnace tension control under the combined working conditions of specification transition and weld passage.

[0023] Furthermore, the present invention also provides a transition tension control system for annealing furnace specifications, comprising: The data acquisition and calculation module is used to collect tension data of each process section of the annealing furnace, and calculate the tension change trend, the first tension difference and the second tension difference based on the tension data within the continuous acquisition cycle. The first tension difference is the tension difference between adjacent process sections, and the second tension difference is the tension difference between the forward strip and the backward strip in the same process section. The direction determination module is used to determine the transition direction as a switch from low tension to high tension or a switch from high tension to low tension based on the tension target relationship between incoming and outgoing materials when the first tension difference or the second tension difference exceeds a preset threshold. The coordination control module is used to prioritize adjusting the subsequent strip tension of the current process segment when switching from low tension to high tension, and to prioritize adjusting the preceding strip tension of the next process segment when switching from high tension to low tension. If the first tension difference still exceeds the preset threshold after adjustment, the module synchronously adjusts the subsequent strip tension of the current process segment and the preceding strip tension of the next process segment according to the preset ratio. The delayed instruction module is used to issue a subsequent strip tension instruction when the weld reaches the next process segment, during the transition from low tension to high tension in the same process segment.

[0024] By adopting the above technical solution, by integrating tension acquisition, direction determination, coordinated control and delay command execution into the same control system, real-time monitoring, intelligent determination and coordinated adjustment of tension in multiple process sections during the specification transition stage of the annealing furnace are realized, and a continuous and stable dynamic control state of tension can be maintained during the switching of strip steel of different specifications.

[0025] The system comprises several modules: a data acquisition and calculation module continuously collects tension data from each process segment and calculates the changing trends and tension differences, enabling real-time perception of the tension status and providing high-precision input for subsequent direction determination and coordinated adjustment; a direction determination module automatically identifies the transition direction based on the tension target relationship between incoming and outgoing materials when the tension difference exceeds a threshold, forming a dynamic logical judgment for switching between high and low tension, ensuring that the control strategy is synchronized with the actual production status; a coordinated control module maintains the tension difference between adjacent process segments within a reasonable range by performing priority adjustment and proportional synchronization control under different transition directions, establishing a stable tension transmission relationship; and a delayed instruction module, based on the weld arrival trigger mechanism, implements the timing of instruction issuance in the scenario of switching from low to high tension, ensuring that the tension adjustment of the subsequent strip corresponds to the strip movement position, preventing premature execution that could cause instantaneous disturbances. Overall, the system achieves closed-loop integrated control of tension detection, determination, coordination, and execution, enabling the annealing furnace to maintain continuous, stable, and efficient operation during specification transitions.

[0026] Preferably, the acquisition and calculation module includes a smoothing correction unit for smoothing tension data that exhibits abnormal fluctuations.

[0027] By introducing a smoothing correction unit during tension data processing, this acquisition and calculation module can correct abnormal fluctuation data and achieve the following technical effects: First, by using a continuous time window to dynamically filter and weighted average the tension acquisition sequence, peak data caused by sensor jitter, sampling delay and instantaneous mechanical impact are eliminated, making the tension input signal more stable and providing continuous and reliable basic data for subsequent tension difference determination and direction recognition, thus avoiding erroneous judgments caused by sudden fluctuations. Second, when the smoothing correction unit detects abnormal fluctuations exceeding the preset range, it automatically triggers the correction algorithm to perform gradient constraints and neighborhood fitting on the outliers, so that the data can reduce abrupt changes while maintaining the true trend, improve the continuity and predictability of the tension change trend curve, and ensure that the calculated tension difference can accurately reflect the actual stress state of each process section. Third, the corrected tension data can be used directly in subsequent control processes, avoiding invalid adjustments or overcompensation triggered by abnormal data in the control system, thereby improving the coordination and stability of the system response, while reducing the frequency of redundant adjustment actions, and ensuring the continuous, stable and high-precision operation of the tension control logic during the transition phase of the annealing furnace specifications.

[0028] Preferably, the coordination control module includes a dynamic compensation unit, which is used to calculate the dynamic compensation coefficient based on the changing trends of the forward and backward strip tensions, and to correct the preset ratio using the dynamic compensation coefficient.

[0029] The coordinated control module achieves the following technical effects by setting a dynamic compensation unit to correct the trend of the preset ratio: First, the dynamic compensation unit establishes a response correlation model between the forward and backward strip steel based on the real-time trend of tension changes. When a deviation in the direction or rate of tension change is detected, the compensation coefficient is calculated in real time to make the proportional correction match the actual stress state of the strip steel, thereby achieving synchronous and coordinated adjustment between adjacent process sections and preventing uneven tension caused by lag in adjustment on one side. Second, through trend-oriented compensation calculation, the system maintains consistent adjustment sensitivity under different specifications, temperatures and speeds. The dynamic compensation unit can automatically update the compensation intensity as production conditions change, enabling the control system to have adaptive characteristics, reducing overshoot and lag problems under fixed ratios, maintaining the continuity and smoothness of the tension change curve, and improving the linear matching of the control response. Third, the introduction of the compensation coefficient transforms the coordinated control module from static proportional control to dynamic closed-loop regulation. While updating the ratio, it maintains stable convergence of the tension difference between each process section, avoids system oscillation caused by repeated corrections, and improves the robustness and control accuracy of tension adjustment. Fourth, this dynamic compensation mechanism transforms tension coordination from experience-based setting to data-driven control. During long-term operation, it can automatically correct proportional deviations, ensuring the stability and reliability of multi-stage tension control logic during the transition of annealing furnace specifications, and improving the overall adaptability and operational consistency of the system under complex production conditions.

[0030] The beneficial effect of this invention is that by collecting and calculating the tension state of each process section of the annealing furnace in real time, the dynamic determination of the tension difference between adjacent process sections and the same process section is realized. This can maintain the continuity and coordination of tension distribution during specification transition, and meet the requirements of synchronous tension adjustment, improved control accuracy and smooth weld passage during specification transition.

[0031] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects.

[0032] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 This is a flowchart of a method for controlling the transition tension of an annealing furnace according to the present invention; Figure 2 This is a schematic diagram of the transition tension control system for an annealing furnace provided by the present invention.

[0035] The module consists of: 1. Acquisition and calculation module; 2. Direction determination module; 3. Coordination and control module; and 4. Delay command module. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following implementation methods.

[0037] Example 1: like Figure 1 As shown in the figure, this embodiment provides a method for controlling the transition tension of an annealing furnace, which includes the following steps: Step S1: Obtain the tension of each process section of the annealing furnace, and calculate the first tension difference and the second tension difference. The first tension difference is the tension difference between adjacent process sections, and the second tension difference is the tension difference between the forward strip and the backward strip in the same process section. Step S2: When the first tension difference or the second tension difference exceeds the preset threshold, based on the tension target relationship between the incoming and outgoing materials, determine the transition direction as switching from low tension to high tension or from high tension to low tension. Step S3: For adjacent process sections, when switching from low tension to high tension, prioritize adjusting the subsequent strip tension of the current process section; when switching from high tension to low tension, prioritize adjusting the preceding strip tension of the next process section. If the first tension difference still exceeds the preset threshold after adjustment, then adjust the subsequent strip tension of the current process section and the preceding strip tension of the next process section synchronously according to the preset ratio. Step S4: For the same process segment, when switching from high tension to low tension, the tension in the same segment remains unchanged. When switching from low tension to high tension, when the weld reaches the next process segment, the subsequent strip tension command is issued.

[0038] By adopting the above technical solution, the tension state of each process section of the annealing furnace is collected in real time and the difference is calculated, which realizes the dynamic determination of the tension difference between adjacent process sections and the same process section. It can maintain the continuity and coordination of tension distribution during specification transition, and meet the requirements of synchronous tension adjustment, improved control accuracy and smooth weld passage during specification transition.

[0039] Specifically, by acquiring the tension of each process segment of the annealing furnace and calculating the first and second tension differences, a multi-segment linkage tension monitoring foundation is formed, providing an accurate basis for subsequent transition direction determination and adjustment logic. By combining the tension target relationship between incoming and outgoing materials when the tension difference exceeds a threshold, a two-way judgment mechanism for transitioning from low to high tension and from high to low tension is constructed, achieving intelligent identification of the transition direction. By setting priority adjustment logic and proportional coordination adjustment logic for adjacent process segments respectively, a two-layer adjustment system of "priority adjustment + synchronous coordination" is formed, enabling the tension to be transmitted with a stable gradient between process segments. By setting a delayed issuance mechanism for weld arrival triggering in the low-tension-to-high-tension scenario of the same process segment, the tension command is matched with the physical transition process, preventing fluctuations caused by early execution. Overall, this method achieves precise coordination and continuous stable control of tension during the specification transition stage while ensuring that the annealing furnace structure and control model remain unchanged.

[0040] Hereinafter, steps S1 to S4 will be specifically described according to embodiments of this application.

[0041] In step S1, it is necessary to continuously acquire tension data of each process section and calculate the tension difference through the tension acquisition link of the annealing furnace.

[0042] Specifically, each process segment can be configured with an independent tension measurement point. Tension data from all measurement points are recorded under a unified time reference to ensure that tension data from each process segment remains consistent in the time dimension. After physical filtering and amplitude correction, the tension data is directly transmitted to the data recording stage to generate a tension data sequence containing time identifiers. Meanwhile, to maintain the continuity and comparability of tension data, the sampling interval is set to a fixed value during the process configuration stage, and the acquisition process is triggered by a unified timing control. Time alignment can be performed during the acquisition process based on the common clock of the entire line. When the upper-level time reference is corrected, each measurement channel resynchronizes and records time from the first complete sampling cycle when the new reference takes effect, preventing time drift between different cycles.

[0043] In this embodiment, the collected tension data can undergo data preprocessing such as abnormal fluctuation identification and smoothing correction, including preprocessing methods such as range checking, dead zone correction, peak detection and replacement, and zero-point drift compensation. Specifically, range checking is used to eliminate outliers exceeding the sensor's linear range; dead zone correction addresses measurement distortion caused by excessively small tension fluctuation amplitudes at low speeds or light loads; peak detection identifies instantaneous outliers by comparing the variation amplitude of continuous sampling points with the local average difference, and the detected outliers are replaced by the weighted average of adjacent healthy samples; zero-point drift compensation estimates the zero-point drift using the linear fitting trend within a sliding time window and corrects it in subsequent calculations.

[0044] After obtaining the smoothed tension data, the control logic performs trend analysis on the tension sequence within the continuous acquisition period. Trend analysis calculates the rate of change of tension, fluctuation amplitude, and steady-state interval within the sliding time window to determine the stability and directionality of tension changes. When the fluctuation amplitude is within a set range, the data is marked as a stable segment for subsequent difference calculation. When fluctuations exceeding the stability threshold are detected within a short period, the data is retained for dynamic response but is not included in the mean calculation of the smoothing window to avoid weakening the true changes.

[0045] By introducing an abnormal fluctuation smoothing correction mechanism and continuous periodic data calculation during the tension acquisition process, the following technical effects can be achieved in this step: First, by smoothing and correcting abnormal fluctuation data, the impact of sensor jitter, local mechanical disturbances and sampling delay on the overall tension calculation is reduced, so that the input tension data remains continuous and reliable, thereby improving the calculation accuracy of the first tension difference and the second tension difference, providing stable data support for the correct determination of the transition direction, and ensuring that subsequent adjustment actions are executed based on accurate tension trends. Second, the formation of a continuous periodic tension change trend can reflect the dynamic tension status of each process section of the annealing furnace, avoid the fluctuation misjudgment caused by single-point data sampling, and make the tension adjustment command based on the trend result rather than the instantaneous value, thereby making the control logic more stable and forward-looking, and ensuring that the tension judgment result can be maintained continuously and consistently during the specification transition period. Third, by combining the abnormal correction results with the tension change trend, the control system can perform filtering and preprocessing once during the data input stage, reducing the number of frequent corrections to control commands, improving the coordination and execution efficiency of control response, further reducing the probability of tension abrupt changes in strip steel due to data fluctuations during the transition stage, and improving the overall stability of tension control during the transition of annealing furnace specifications.

[0046] After establishing a stable tension sequence, the tension difference between adjacent process sections is calculated as the first tension difference, and the tension difference between the forward and backward strips within the same process section is calculated as the second tension difference. Both types of differences are calculated using vectorization with the current sampling period as the time reference.

[0047] First tension difference Defined as:

[0048] in, For the current process section tension, The tension is for the next adjacent process segment.

[0049] Second tension difference Defined as:

[0050] in, For the forward strip tension in the same process section, This refers to the subsequent strip tension in this process section.

[0051] All calculation results are stored in the tension difference data table, which is used for subsequent steps to determine the transition direction and coordinate tension adjustment.

[0052] Furthermore, to ensure the stability of the tension difference calculation, the control logic can perform a data verification once after each sampling cycle. If the tension data loss or communication abnormality of any process segment is detected, the valid value of the previous cycle will be automatically called to participate in the difference calculation and marked as "data replacement status" in the record to prevent abnormal data from causing sudden changes in the judgment result. If a process segment with continuous sampling abnormalities occurs, the tension difference calculation will be suspended and will wait for the next complete cycle to recalculate.

[0053] In some embodiments of this application, the smoothed tension data is used not only for tension difference calculation, but also for constructing a tension change trend model for each process segment. The trend model generates the tension change rate based on time series regression results. This model is used to determine the inertial characteristics of tension changes. When the rate of change of tension remains positive for several consecutive cycles and the amplitude increases, it is determined to be an upward trend; when it remains negative for several consecutive cycles and the amplitude increases, it is determined to be a downward trend. The existence of the trend model ensures that the direction of inertia can be identified in advance and dynamic compensation can be performed when subsequent tension adjustment commands are issued.

[0054] Furthermore, to reduce errors caused by sensor response delay and signal noise, multi-stage filtering can be performed on the tension data during the acquisition process. The tension data is first subjected to low-pass filtering to remove high-frequency interference, and then to median filtering to eliminate single-point glitches; the filtering parameters are set during the calibration stage and remain fixed during operation without dynamic adjustment; all smoothing corrections and filtering processes are completed within the acquisition process, and the output tension data is the corrected and valid result.

[0055] In this embodiment, the accuracy of data acquisition, time synchronization deviation, and data update delay all affect the accuracy of tension difference calculation. Therefore, to ensure the accuracy of the calculation results, delay calibration is performed during the data synchronization process. Delay calibration is triggered during roll change in production. The average delay is obtained by comparing the response time difference of tension changes in adjacent process sections, and compensation is performed during subsequent data fusion.

[0056] Once the tension difference calculation is complete, the tension difference results within the current sampling period will be used to generate a tension difference distribution for real-time display and comparison with historical records. The displayed content may include three indicators: tension difference between adjacent process sections, tension difference within the same process section, and overall fluctuation trend. This is for monitoring and analysis only and does not participate in control execution.

[0057] For example, in actual annealing furnace operation, the number of process sections can be six to eight, the tension difference between adjacent process sections is usually maintained in the range of 2 to 3 kN, the sampling period is 200 ms, and the sliding window length is 5 s; each process section is equipped with a set of independent tension sensors and signal conditioning channels; the sliding window weight for smooth correction adopts exponential decay weight, and the weight coefficient is set according to the tension fluctuation characteristics of the process section and remains fixed during operation.

[0058] Thus, step S1 achieves high-precision monitoring of tension during the specification transition of the annealing furnace, enabling accurate identification and quantification of tension changes during the specification transition process, and providing a complete data foundation for subsequent transition direction determination and coordinated adjustment.

[0059] In step S2, the core is to dynamically determine whether the annealing furnace is in a state of "switching from low tension to high tension" or "switching from high tension to low tension" when the first tension difference or the second tension difference exceeds a preset threshold, based on the tension target relationship between the incoming and outgoing materials. This process is built on the continuous tension difference sequence formed in step S1, and ensures the timeliness and stability of the direction determination through multi-dimensional parameter judgment and trend prediction mechanisms.

[0060] Specifically, during execution, the system continuously monitors the first tension difference and the second tension difference of each process segment and compares them with the current preset threshold in real time. If the absolute value of any tension difference exceeds the threshold range, it is determined to enter the specification transition state.

[0061] The preset threshold is not a fixed value, but is determined based on the structural characteristics of the annealing furnace's process sections and the strip temperature difference. The strip temperature difference is considered because there is a temperature gradient between the strip sections, and this temperature difference affects the material's yield strength and tensile response sensitivity. When an increase in the strip temperature difference is detected, the control logic should raise the tension threshold to prevent transient tension fluctuations caused by thermal expansion from being misjudged as abnormal. Conversely, when the temperature difference decreases, the threshold is lowered accordingly to improve the judgment sensitivity.

[0062] During the threshold adjustment process, real-time temperature monitoring data is invoked, and temperature acquisition points are configured in each process section to output the strip surface temperature. The control logic uses a temperature difference function. Calculate the temperature difference between adjacent segments, where For the current process section tension, The tension is for the next adjacent process segment.

[0063] Then, based on empirical calibration relationships, the threshold adjustment function is defined as:

[0064] in, The adjusted preset threshold, As the baseline threshold, The temperature correction coefficient is determined through experimental calibration when the equipment is put into production and is not dynamically learned during operation. Thus, whenever the temperature difference is updated, a new threshold can be automatically calculated and take effect in the next sampling cycle. In this way, the tension difference comparison between different temperature zones can dynamically match the mechanical response characteristics of the material, thereby ensuring the stability and reliability of the threshold determination. For example, during the production process, if... It is 1.8. The preset threshold is 1 / 60. When the temperature difference of the strip increases from 40℃ to 60℃, the preset threshold is automatically increased from 3kN to about 3.6kN to suppress the misjudgment of transient tension fluctuations caused by high temperature.

[0065] By setting a preset threshold in relation to the layout of the annealing furnace process section and the temperature difference of the strip steel, the following technical effects can be achieved in this step: First, by combining the structural characteristics of different process sections, the tension difference threshold is set differently so that the tension judgment criteria of sections near the heating zone, heat soaking zone and cooling zone match their thermal load and transmission inertia. This makes the tension adjustment more in line with the actual thermal stress change law and avoids frequent triggering of adjustment in some process sections due to a uniform threshold. Second, the threshold is dynamically adjusted according to the temperature difference of the strip steel, making the tension judgment more lenient when the temperature gradient is large and more sensitive when the temperature gradient is small. This balances tension stability and adjustment responsiveness, ensuring that the tension in the high-temperature section is not triggered by the instantaneous temperature difference and that the real tension fluctuation in the low-temperature section can be identified in a timely manner. Third, the logic of relating temperature difference to threshold is incorporated into the tension control strategy, enabling the system to have adaptive capabilities. It can automatically correct the threshold range under different specifications, speeds, and strip thicknesses, reducing manual intervention and improving the adaptability and accuracy of the control system in responding to tension anomalies during specification transitions.

[0066] When any tension difference exceeds the corresponding threshold Then, the transition direction determination stage begins. In this stage, the tension target values ​​for the incoming and outgoing material sections are used as the basis. The incoming tension target represents the steady-state tension level of the upstream process section, and the outgoing tension target represents the steady-state tension level of the downstream process section. The real-time target values ​​for both can be read from the production plan or tension control model, and the target difference can be calculated.

[0067] in, To achieve the target of material tension, The target tension is for the incoming material. If... This indicates that the downstream tension target is higher than the upstream tension, and is judged as a "switch from low tension to high tension"; if This indicates that the downstream tension target is lower than the upstream tension, and is determined as a "switch from high tension to low tension". The direction determination result is stored in the control register as a logical condition for subsequent coordination and adjustment. For example, when the strip thickness transitions from 0.8mm to 1.2mm, if the tension target of the de-material section is about 2kN higher than that of the incoming section, it is determined as a "switch from low tension to high tension"; if the transition is reversed, it is determined as a "switch from high tension to low tension".

[0068] In this embodiment, to improve the stability of direction determination, a trend prediction analysis can be performed on the tension target sequence before each determination. A linear recursive model is used to regress and fit the changes in the tension target over multiple past sampling periods to obtain the rate of change of the tension target. Let the current sampling period be... The rate of change of the tension target Defined as:

[0069] in, and These are the target tension values ​​for two adjacent cycles. The sampling interval is defined as follows: when the predicted rate of change of the tension target is within the set rate threshold range, i.e. If the tension target change process is considered stable, the current direction determination remains unchanged; when When the current direction is not consistent with the trend direction, the transition direction update logic is triggered. The current direction is compared with the trend direction to determine whether they are consistent. If they are not consistent, a direction refresh is performed.

[0070] By introducing a trend prediction and rate judgment mechanism for the incoming and outgoing material tension targets during the transition direction determination process, the following technical effects can be achieved in this step: First, by using trend prediction analysis to analyze the historical changes and real-time fluctuation characteristics of the tension targets for incoming and outgoing materials, a curve of the direction and rate of change of the tension targets is formed. This avoids incorrect transition direction judgments due to differences in single targets, enabling the system to dynamically identify the true switching direction from low tension to high tension or from high tension to low tension based on trend results, thus maintaining the stability and accuracy of direction judgment. Second, the system determines the rate of change of the tension target based on the prediction results and triggers the update logic when the rate is within the threshold range. This enables the system to update the judgment results in advance when the specification transition is critical, reducing the control lag caused by the direction switching delay, synchronizing the tension adjustment with the process section status, and improving the response coordination during the transition phase. Third, by setting a rate threshold range, instantaneous changes caused by random fluctuations are filtered out, preventing the system from frequently updating the direction determination, maintaining the smoothness and consistency of the control logic, thereby reducing the tension disturbances caused by frequent switching, and ensuring that the control process remains stable and continuous in a dynamic environment. Fourth, this prediction and judgment mechanism transforms the transition direction update from passive triggering to active triggering based on rate changes, enhancing the system's ability to anticipate specification switching trends, achieving intelligent and adaptive direction determination in complex production rhythms, and improving the overall tension control reliability and accuracy of the annealing furnace specification transition process.

[0071] Furthermore, trend prediction can employ a sliding window mechanism, with the window length consistent with the tension sampling window. Simultaneously, to prevent misjudgments caused by short-term noise, the direction update result is only confirmed after the directional trends of two consecutive windows are consistent. This mechanism ensures the stability of direction updates and can respond promptly to rapid specification changes or sudden thickness shifts.

[0072] In other embodiments of this application, during the direction determination process, the control logic can also synchronously record the direction status and update time of each process segment for use in the execution sequence control of the subsequent coordination and adjustment phase. The status identifier of each process segment is set as a binary variable. ,in This indicates a shift from low to high tension. This indicates a transition from high tension to low tension; the directional states of all process sections then form a direction vector. This vector is dynamically updated within the control loop and is used to calculate the adjustment priority in subsequent synchronization and coordination adjustment logic.

[0073] Furthermore, since variations in strip thickness, width, and material all affect the tension target relationship, a specification parameter table can be loaded during the initialization phase to accommodate transitions between different specifications. This table records the tension target difference range and direction variation rules for each specification combination. During direction determination, the control logic prioritizes matching the parameter range of the current specification combination before calculating the target difference and rate, thereby achieving a unified determination logic across specification scenarios.

[0074] Thus, step S2 achieves dynamic direction determination based on real-time tension difference and target trend, and enhances the stability and responsiveness of direction determination through temperature correction threshold and trend prediction mechanism, providing accurate input conditions for subsequent coordinated adjustments.

[0075] In step S3, which corresponds to the coordinated adjustment process between adjacent process sections, it is the core logic of the execution layer in the transition control of annealing furnace specifications. The aim is to clarify the transition direction and, based on the magnitude of the tension difference and the inertia characteristics of the process section, use priority adjustment and synchronous adjustment mechanisms to make the tension difference between adjacent process sections return to the threshold range.

[0076] Specifically, when the transition direction is determined to be a switch from low tension to high tension, the tension of the downstream strip in the current process section should be adjusted first. The tension of the downstream strip reflects the exit tension of the process section and is a direct input factor to changes in the tension of the downstream strip. By adjusting the tension of the downstream strip, a tension buffer can be formed upstream to reduce the tension impact caused by sudden changes downstream.

[0077] When making adjustments, the tension target of the current process section is calculated differentially from the real-time tension to generate the adjustment amount. And based on the proportional gain coefficient Make corrections:

[0078] in, This represents the current tension of the strip steel following the current process section. For the adjusted tension, This is a proportional correction factor, set based on the control response characteristics of this process segment. For example, It can be -2kN.

[0079] After adjustment, recalculate the first tension difference. If the first tension difference is still greater than the threshold... This indicates that a single-point adjustment is insufficient to restore balance, and at this point, the synchronous coordination adjustment logic is triggered.

[0080] The basic principle of synchronous coordination adjustment is to simultaneously adjust the ratio of the downstream strip tension in the current process segment and the upstream strip tension in the next process segment, so that the tension difference between the two process segments gradually approaches a threshold range in a relatively balanced manner. Synchronous adjustment follows a preset ratio. The determination principle is directly related to the transmission inertia of the process section. Process sections with large transmission inertia have slower inertial response and lower tension change rates during adjustment, requiring a higher adjustment ratio to ensure overall system coordination. Process sections with small transmission inertia are more sensitive to adjustment and should be given a smaller adjustment ratio. The coordinated adjustment relationship between the two sections is expressed as follows:

[0081] in, and These refer to the adjusted rear strip tension and front strip tension, respectively. To synchronize the adjustment amount, The preset proportional parameter is the transmission inertia ratio. Decide The values ​​of satisfy:

[0082] in, and These are the transmission inertia of the current process segment and the next process segment, respectively. This method maintains matching adjustment rates under different inertia conditions, preventing excessively rapid tension response in one segment from causing sudden tension changes. For example, when the transmission inertia ratio of adjacent process segments is... When the ratio is 2:1, the preset ratio It is 0.67.

[0083] After the adjustment is completed, the tension difference is recalculated and the trend prediction is updated. Once the tension difference returns to the threshold range, the current coordination process ends.

[0084] By using the ratio of transmission inertia between adjacent process sections as the basis for setting the preset ratio, the following technical effects can be achieved in this step: First, the proportional distribution during tension synchronization adjustment should conform to the dynamic response characteristics of the transmission system of each process section. Process sections with large transmission inertia have a slower rate of tension change due to their higher inertia. By assigning a larger preset ratio, the strip steel can be kept under balanced force during coordinated adjustment, preventing tension mismatch caused by response lag in high inertia sections. Second, the transmission inertia is introduced into the proportional setting logic, so that the control system has the ability to adapt to the structure. Under different furnace section lengths, roller diameters and drive power conditions, it can automatically match a reasonable tension adjustment range, thereby avoiding the problem of over- or under-adjustment of some process sections caused by a fixed ratio. Third, based on the inertia ratio setting ratio, the tension adjustment of adjacent process sections achieves dynamic coupling, forming a stable tension transmission chain during specification transition, so that the tension changes of each section maintain a linear relationship, reducing the impact and repeated energy compensation between transmission systems, and improving the continuity and mechanical coordination of annealing furnace operation. Fourth, by establishing a proportional mapping through the inertia ratio, the adjustment parameters of the control system are derived from the inherent characteristics of the equipment rather than empirical values, reducing reliance on manual parameter adjustment and ensuring the consistency and predictability of tension adjustment behavior in each process section during long-term operation, thereby improving the standardization and robustness of specification transition control.

[0085] When the transition direction is determined to be a switch from high tension to low tension, the forward strip tension of the next process segment is adjusted first. The forward strip tension reflects the downstream segment's absorption capacity of the upstream output, and its changes have a greater impact on the stability of the overall tension chain. At this point, the tension target and actual tension of the next process segment are calculated differentially to generate the adjustment amount. and through the proportionality coefficient Correction:

[0086] in, The current tension of the strip steel moving forward in the next process section, For the adjusted tension, This is a proportional correction factor, set based on the control response characteristics of this process segment. For example, It can be -1kN.

[0087] If the first tension difference is still higher than the threshold after adjustment Then, the same synchronous coordination logic as the switching from small tension to large tension is executed, according to the preset ratio. Make simultaneous corrections for the current and next process stages.

[0088] Furthermore, to improve adjustment accuracy, a dynamic compensation coefficient is calculated based on the tension variation trends of the forward and backward strips during each synchronous adjustment according to a preset ratio. Used to correct preset ratios This allows the adjustment results to better adapt to real-time operating conditions. The dynamic compensation coefficient is defined as:

[0089] in, The rate of change of tension in the forward strip. Let ε be the rate of change of strip tension, and ε be a minimal constant to prevent division by zero. The coefficient is... The range of values ​​can be .when When the current timeframe indicates that the moving strip is changing faster, the adjustment ratio of the current process section can be increased; conversely, when the current timeframe indicates that the moving strip is changing faster... If so, the adjustment ratio of the current process segment is reduced. The final correction ratio is expressed as:

[0090] in, These are dynamic compensation weighting coefficients used to control the compensation intensity. (Modified) The values ​​are substituted into the synchronization adjustment equation, updating the adjustment instructions. For example, if... Furthermore, if the rate of change of tension in the preceding strip is detected to be approximately 30% higher than that in the following strip over three consecutive sampling periods, then the dynamic compensation coefficient... Take 0.13, and weight it. After correction, the final adjustment ratio was obtained. Approximately 0.72, at this point, according to the formula for the coordination and adjustment relationship between the two segments, the actual adjustment ratio is... .

[0091] In this step, a dynamic compensation coefficient is calculated based on the changing trend of the tension of the strip in the preceding and following rows and used to correct the preset ratio, which can achieve the following technical effects: First, by simultaneously analyzing the direction and rate of change of tension in the forward and backward strip, a trend coupling model is formed to make real-time corrections to the preset ratio, so that the ratio adjustment no longer depends on the initial setting, but can dynamically change according to the actual stress state of the strip, ensuring that the synchronous adjustment response of adjacent process sections is more coordinated, and preventing the tension control system from experiencing follow-up lag or overshoot fluctuations due to inertia differences. Second, the dynamic compensation coefficient is continuously updated with the trend change. When the tension increase and decrease rates are inconsistent, the proportional amplitude is automatically corrected so that the adjustment direction is consistent with the actual tension change direction. This avoids reverse correction and system oscillation caused by excessive proportion, and maintains the smoothness and predictability of the strip tension change curve, so that the annealing furnace maintains a stable tension transmission chain during specification transition. Third, combined with the trend calculation window, the system can achieve rolling updates. The system can adaptively adjust the compensation intensity according to the tension response characteristics under different strip thicknesses, speeds and temperatures, so that the proportional correction conforms to the real-time dynamic characteristics of the equipment, taking into account both the stability of the high inertia section and the sensitivity of the low inertia section, and improving the universal adaptability under different working conditions. Fourth, the introduction of dynamic compensation enables the control strategy to form a two-layer feedback structure that combines basic proportion and trend correction, reducing the reliance on manual experience settings, reducing the risk of proportion drift or compensation imbalance in long-term operation, and improving the long-term stability and maintainability of the annealing furnace specification transition tension control system.

[0092] After each synchronization adjustment, the tension difference is recalculated and trend smoothing is performed. If the tension difference remains within the threshold range for two consecutive sampling periods, it is recorded as a stable state; otherwise, it enters the next synchronization adjustment. All adjustment actions are executed in a closed loop within the same control cycle, and the tension change in each adjustment is recorded for subsequent trend learning and model correction. For example, after synchronization coordination, the tension difference between adjacent process sections decreased from 3.4kN to 2.8kN, stabilizing within the threshold range.

[0093] Thus, step S3 achieves graded adjustment and adaptive coordination between adjacent process sections in the transition state, ensuring the tension chain remains continuous and balanced during specification transition, and providing execution support for the efficient and stable operation of the annealing furnace.

[0094] In step S4, which corresponds to the tension adjustment logic within the same process segment, it is a control link for the problem of inconsistent tension between the forward and backward strip steel within a single process segment during specification transition. It aims to eliminate tension disturbances within the process segment and maintain the stable traction state of the strip steel in the furnace by maintaining or delaying control commands in different tension switching scenarios.

[0095] Specifically, when the transition direction is determined to be a switch from high tension to low tension, the tension of the current process segment remains unchanged. This is because the preceding strip in the annealing furnace is in a high tension zone at this time, while the following strip has just entered the stage of thinning or softening. If the tension of the following strip is adjusted immediately, it may cause an imbalance in the tension transmission of the upstream segment, resulting in tension backlash or fluctuations. Therefore, to avoid the propagation of disturbances, no tension update operation is performed in this direction; only the original tension output is maintained, and the tension difference between the preceding and following strips is continuously monitored. When the tension difference naturally returns to the threshold range within several consecutive sampling periods, the normal closed-loop monitoring state is automatically restored.

[0096] When the transition direction is determined to be a switch from low tension to high tension, the response direction of the tension change is consistent with the strip flow direction, which can easily form a local tension spike at the weld. Therefore, to suppress this spike effect, the subsequent strip tension command is not immediately executed before the weld reaches the next process section. Instead, the tension control command is issued after the weld passes the inter-section detection position. Weld detection can be achieved using an infrared sensor or laser displacement meter installed at the process section exit. After detecting the weld passage signal, the delayed command stage is immediately initiated.

[0097] During the delayed instruction phase, the tension offset is first calculated based on the tension change trend in the previous adjustment cycle.

[0098] Specifically, the tension change trend is calculated from a sequence of tension change rates over multiple consecutive sampling periods, and is defined as:

[0099] in, The tension value for the current sampling period. This is the tension value from the previous cycle. The sampling interval is denoted as .

[0100] The tension offset can then be calculated from the trend sequence. The calculation formula is:

[0101] in, This is the trend decay coefficient, used to control the influence of early samples on the offset. For trend sampling window length; tension offset It reflects the cumulative offset trend of tension changes before and after the weld, and is used to compensate for the next tension command.

[0102] The compensation logic is achieved by modifying the tension target command, and the modification formula is as follows:

[0103] in, The tension target determined in the previous cycle, This is the actual tension command issued after offset compensation. Through this compensation, the stress on the subsequent strip can be made to change continuously with that on the preceding strip at the moment the weld reaches the next process section, preventing local elongation differences caused by sudden increases or decreases in tension at the weld.

[0104] The compensated tension command is issued immediately after the weld detection signal is triggered, and closed-loop updates are performed at millisecond intervals, inputting the corrected tension command to the corresponding drive control channel. Due to the introduction of compensation, the rate of change of the issued command is smoother than conventional tension switching, and multiple intermediate transition points are automatically interpolated within the issuance cycle to form a smooth tension transition curve.

[0105] In this step, by calculating and compensating for the tension offset based on the tension change trend of the previous adjustment cycle when the weld reaches the next process section, and then issuing the subsequent strip tension command, the following technical effects can be achieved: First, by using the tension change trend in the previous adjustment cycle to calculate the offset, the control system can predict the direction and magnitude of tension change before the weld enters the next process section, thereby achieving pre-compensation, suppressing the tension jump at the moment the weld crosses the interface, avoiding sudden stretching or relaxation at the transition point, and ensuring stable passage of the weld area. Second, by combining the compensation amount with trend calculation, a dynamic correction mechanism is formed, which synchronizes the compensation behavior with the tension difference between process sections and the change of strip inertia. This avoids over-adjustment or response lag caused by fixed compensation values, and ensures that the subsequent strip tension command can be accurately matched with the actual tension change state, thus ensuring a continuous and smooth transition of tension during the weld process. Third, by issuing tension commands only when the weld seam is reached, the timing of control is directly correlated with the physical transition process, eliminating the control deviation caused by issuing commands in advance or delaying execution in the traditional way, reducing the accumulation of tension disturbances near the weld seam, and improving the stability of strip steel operation in the entire annealing furnace production rhythm. Fourth, by combining trend offset calculation with real-time compensation logic, the tension command issuance behavior is changed from timed triggering to event triggering based on trend judgment, which enhances the system's adaptability to the weld operation status and makes the control commands both real-time and targeted, thereby maintaining the stability and continuity of annealing furnace tension control under the combined working conditions of specification transition and weld passage.

[0106] Furthermore, to avoid system lag caused by instruction delays, the control logic can activate a synchronization clock after the weld seam passes the inspection point to ensure precise alignment of the execution timing of delayed instructions. This synchronization clock is linked to the strip speed signal and is based on the distance from the weld seam passing the inspection point to the next tension control point. With strip speed Calculate the delay time:

[0107] At the end of the delay time, the tension command is issued to ensure that the tension command and physical position are synchronized when the weld passes through the next process segment. If the strip speed fluctuation is detected to exceed the set range, the system will automatically correct the delay time to avoid inconsistent tension caused by premature or delayed execution. For example, when the strip speed is 150 m / min and the distance from the inter-segment detection point to the control point is 0.75 m, the delay time is... After the weld passes inspection, the system uses that time as a delay benchmark to complete trend calculation and compensation update. At the end, a revised subsequent strip tension command is issued.

[0108] Thus, step S4 achieves stable tension maintenance when switching from high tension to low tension, and completes precise synchronization through delay and compensation mechanisms when switching from low tension to high tension. At the same time, the introduction of trend prediction and offset correction effectively suppresses transient tension fluctuations at the weld position, making the tension changes within the same process section smoother and more continuous, laying the foundation for stable operation of the subsequent transition section.

[0109] In summary, this method achieves graded and coordinated control of tension in adjacent and same sections during specification transitions by real-time acquisition of tension in each process section of the annealing furnace, calculation of the difference, and determination of direction. It can execute priority adjustments, synchronous proportional corrections, and delayed compensation based on the transition direction, dynamically maintaining the tension difference within a threshold range. This control strategy achieves a smooth transition during tension switching without altering the original hardware structure, effectively reducing the risk of belt breakage and shutdown caused by sudden tension changes, and ensuring the continuity and stability of the annealing furnace operation.

[0110] It should be noted that, although the embodiments in this application are based on... Figure 1 Steps S1 to S4 are described sequentially, but this does not mean that steps S1 to S4 must be performed in a strict order. The reason this embodiment follows this order is... Figure 1 The order in which steps S1 to S4 are described is provided to facilitate understanding of the technical solutions of the embodiments of this application by those skilled in the art. In other words, in the embodiments of this application, the order of steps S1 to S4 can be appropriately adjusted according to actual needs.

[0111] Example 2: like Figure 2 As shown, this embodiment provides a specification transition tension control system for an annealing furnace, comprising: The data acquisition and calculation module 1 is used to acquire tension data of each process section of the annealing furnace, and calculate the tension change trend, the first tension difference and the second tension difference based on the tension data within the continuous acquisition cycle. The first tension difference is the tension difference between adjacent process sections, and the second tension difference is the tension difference between the forward strip and the backward strip in the same process section. The direction determination module 2 is used to determine the transition direction as a switch from low tension to high tension or a switch from high tension to low tension based on the tension target relationship between incoming and outgoing materials when the first tension difference or the second tension difference exceeds a preset threshold. The coordination control module 3 is used to prioritize adjusting the subsequent strip tension of the current process segment when switching from low tension to high tension, and to prioritize adjusting the preceding strip tension of the next process segment when switching from high tension to low tension. If the first tension difference still exceeds the preset threshold after adjustment, the subsequent strip tension of the current process segment and the preceding strip tension of the next process segment are adjusted synchronously according to the preset ratio. The delay instruction module 4 is used to issue a subsequent strip tension instruction when the weld reaches the next process segment, during the transition from low tension to high tension in the same process segment.

[0112] By adopting the above technical solution, by integrating tension acquisition, direction determination, coordinated control and delay command execution into the same control system, real-time monitoring, intelligent determination and coordinated adjustment of tension in multiple process sections during the specification transition stage of the annealing furnace are realized, and a continuous and stable dynamic control state of tension can be maintained during the switching of strip steel of different specifications.

[0113] Specifically, the data acquisition and calculation module 1 continuously collects tension data from each process segment and calculates the changing trends and tension differences, enabling the system to have real-time perception of the tension state and providing high-precision input for subsequent direction determination and coordinated adjustment. The direction determination module 2 automatically identifies the transition direction based on the tension target relationship between incoming and outgoing materials when the tension difference exceeds a threshold, forming a dynamic logical judgment for switching between high and low tension, ensuring that the control strategy is synchronized with the actual production state. The coordinated control module 3 maintains the tension difference between adjacent process segments within a reasonable range by performing priority adjustment and proportional synchronization control under different transition directions, constructing a stable tension transmission relationship. The delayed instruction module 4, based on the weld arrival trigger mechanism, implements the timing of instruction issuance in the scenario of switching from low to high tension, ensuring that the tension adjustment of the subsequent strip steel corresponds to the strip steel movement position, preventing premature execution and instantaneous disturbances. Overall, the system achieves closed-loop integrated control of tension detection, determination, coordination, and execution, enabling the annealing furnace to maintain a continuous, stable, and efficient operating state during specification transitions.

[0114] In some embodiments of this application, the acquisition and calculation module 1 includes a smoothing correction unit for smoothing tension data that exhibits abnormal fluctuations.

[0115] The acquisition and calculation module 1 achieves the following technical effects by introducing a smoothing correction unit to correct abnormal fluctuation data during tension data processing: First, by using a continuous time window to dynamically filter and weighted average the tension acquisition sequence, peak data caused by sensor jitter, sampling delay and instantaneous mechanical impact are eliminated, making the tension input signal more stable and providing continuous and reliable basic data for subsequent tension difference determination and direction recognition, thus avoiding erroneous judgments caused by sudden fluctuations. Second, when the smoothing correction unit detects abnormal fluctuations exceeding the preset range, it automatically triggers the correction algorithm to perform gradient constraints and neighborhood fitting on the outliers, so that the data can reduce abrupt changes while maintaining the true trend, improve the continuity and predictability of the tension change trend curve, and ensure that the calculated tension difference can accurately reflect the actual stress state of each process section. Third, the corrected tension data can be used directly in subsequent control processes, avoiding invalid adjustments or overcompensation triggered by abnormal data in the control system, thereby improving the coordination and stability of the system response, while reducing the frequency of redundant adjustment actions, and ensuring the continuous, stable and high-precision operation of the tension control logic during the transition phase of the annealing furnace specifications.

[0116] In some embodiments of this application, the coordination control module 3 includes a dynamic compensation unit, which is used to calculate the dynamic compensation coefficient based on the changing trends of the forward strip tension and the backward strip tension, and to correct the preset ratio using the dynamic compensation coefficient.

[0117] The coordination control module 3 achieves the following technical effects by setting a dynamic compensation unit to correct the trend of the preset ratio: First, the dynamic compensation unit establishes a response correlation model between the forward and backward strip steel based on the real-time trend of tension changes. When a deviation in the direction or rate of tension change is detected, the compensation coefficient is calculated in real time to make the proportional correction match the actual stress state of the strip steel, thereby achieving synchronous and coordinated adjustment between adjacent process sections and preventing uneven tension caused by lag in adjustment on one side. Second, through trend-oriented compensation calculation, the system maintains consistent adjustment sensitivity under different specifications, temperatures and speeds. The dynamic compensation unit can automatically update the compensation intensity as production conditions change, enabling the control system to have adaptive characteristics, reducing overshoot and lag problems under fixed ratios, maintaining the continuity and smoothness of the tension change curve, and improving the linear matching of the control response. Third, the introduction of the compensation coefficient transforms the coordination control module 3 from static proportional control to dynamic closed-loop regulation. While updating the ratio, it maintains stable convergence of the tension difference between each process section, avoids system oscillation caused by repeated corrections, and improves the robustness and control accuracy of tension adjustment. Fourth, this dynamic compensation mechanism transforms tension coordination from experience-based setting to data-driven control. During long-term operation, it can automatically correct proportional deviations, ensuring the stability and reliability of multi-stage tension control logic during the transition of annealing furnace specifications, and improving the overall adaptability and operational consistency of the system under complex production conditions.

[0118] In summary, by integrating modules such as the data acquisition and calculation module 1, the direction determination module 2, the coordination control module 3, and the delay command module 4, this system achieves real-time detection, direction identification, and dynamic adjustment of multi-segment tension during the specification transition phase of the annealing furnace. It can maintain continuous and stable tension transmission in each process segment when the strip steel specifications change. At the same time, the smoothing correction unit in the system ensures the accuracy and trend continuity of tension data, and the dynamic compensation unit realizes adaptive correction of proportional parameters, so that the control strategy maintains consistent response accuracy under different operating conditions. This improves the stability and robustness of tension coordination control and ensures the safe, efficient, and continuous operation of the annealing furnace during the specification transition process.

[0119] The above-disclosed embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any non-creative variations that can be conceived by those skilled in the art, as well as any improvements and modifications made without departing from the principles of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for controlling the transition tension of an annealing furnace, characterized in that, Includes the following steps: Obtain the tension of each process section of the annealing furnace, and calculate the first tension difference and the second tension difference. The first tension difference is the tension difference between adjacent process sections, and the second tension difference is the tension difference between the forward strip and the backward strip in the same process section. When the first tension difference or the second tension difference exceeds a preset threshold, the transition direction is determined to be a switch from low tension to high tension or a switch from high tension to low tension based on the tension target relationship between incoming and outgoing materials. For the adjacent process segments, when switching from low tension to high tension, the subsequent strip tension of the current process segment is adjusted first, and when switching from high tension to low tension, the preceding strip tension of the next process segment is adjusted first. If the first tension difference still exceeds the preset threshold after adjustment, the subsequent strip tension of the current process segment and the preceding strip tension of the next process segment are adjusted synchronously according to a preset ratio. For the same process segment, when switching from high tension to low tension, the tension in the same segment remains unchanged; when switching from low tension to high tension, when the weld reaches the next process segment, a subsequent strip tension command is issued.

2. The method for controlling the transition tension of an annealing furnace as described in claim 1, characterized in that, The process of obtaining the tension of each process segment of the annealing furnace includes: collecting tension data of each process segment, identifying and smoothing the tension data for abnormal fluctuations, and calculating the tension change trend based on the corrected tension data within a continuous acquisition period.

3. The method for controlling the transition tension of an annealing furnace as described in claim 1, characterized in that, The preset threshold is adjusted according to the arrangement of each process section of the annealing furnace and the temperature difference of the strip steel. When the temperature difference of the strip steel increases, the preset threshold is increased.

4. The method for controlling the transition tension of an annealing furnace as described in claim 1, characterized in that, When determining the transition direction, the trend prediction of the tension target relationship between the incoming and outgoing materials is performed. Based on the prediction result, the rate of change of the tension target is determined. When the rate of change of the tension target is within a threshold range, the update logic of the transition direction is triggered.

5. The method for controlling the transition tension of an annealing furnace as described in claim 1, characterized in that, The preset ratio is determined based on the ratio of transmission inertia of adjacent process segments, with the process segment with a larger transmission inertia corresponding to a larger preset ratio.

6. The method for controlling the transition tension of an annealing furnace as described in claim 5, characterized in that, The dynamic compensation coefficient is calculated based on the changing trends of the forward strip tension and the backward strip tension, and the dynamic compensation coefficient is used to correct the preset ratio.

7. The method for controlling the transition tension of an annealing furnace as described in claim 2, characterized in that, The step of issuing a subsequent strip tension command when the weld reaches the next process segment includes: calculating the tension offset based on the tension change trend in the previous adjustment cycle when the weld reaches the next process segment, compensating for the tension offset, and issuing a subsequent strip tension command.

8. A specification transition tension control system for an annealing furnace, characterized in that, include: The data acquisition and calculation module is used to acquire tension data of each process section of the annealing furnace, and calculate the tension change trend, the first tension difference and the second tension difference based on the tension data within the continuous acquisition cycle. The first tension difference is the tension difference between adjacent process sections, and the second tension difference is the tension difference between the forward strip and the backward strip in the same process section. The direction determination module is used to determine the transition direction as a switch from low tension to high tension or a switch from high tension to low tension based on the tension target relationship between incoming and outgoing materials when the first tension difference or the second tension difference exceeds a preset threshold. The coordination control module is used to prioritize adjusting the subsequent strip tension of the current process segment when switching from low tension to high tension, and to prioritize adjusting the preceding strip tension of the next process segment when switching from high tension to low tension. If the first tension difference still exceeds the preset threshold after adjustment, the module synchronously adjusts the subsequent strip tension of the current process segment and the preceding strip tension of the next process segment according to a preset ratio. The delay instruction module is used to issue a subsequent strip tension instruction when the weld reaches the next process segment, during the transition from low tension to high tension in the same process segment.

9. The annealing furnace specification transition tension control system as described in claim 8, characterized in that, The acquisition and calculation module includes a smoothing correction unit, which is used to smooth the tension data that exhibits abnormal fluctuations.

10. The annealing furnace specification transition tension control system as described in claim 8, characterized in that, The coordination control module includes a dynamic compensation unit, which is used to calculate a dynamic compensation coefficient based on the changing trends of the forward strip tension and the backward strip tension, and to use the dynamic compensation coefficient to correct the preset ratio.

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