Tenter setting machine operation parameter self-adapting coordinated control system

Abstract

This invention discloses an adaptive and coordinated control system for the operating parameters of a tenter frame, relating to the field of textile setting control technology. The system includes the following components: When there is a sudden change in traction speed or inlet surface density, the system first identifies the heat integral deviation of the target setting chamber and freezes the low-frequency base opening when the heat source control valve is in the pure time-delay thermal dead zone; then, it controls the variable-frequency circulating fan to implement micro-eddy current drive within the critical suspension zone to peel off the high-temperature boundary layer on the fabric surface; subsequently, it determines the advance injection time difference of mechanical displacement based on the rheological state of the target setting chamber and issues a reverse tension immune displacement command to the fabric feeding overfeed mechanism; finally, it allocates regenerated reinjection power within the common DC bus network and smoothly cancels the micro-eddy current drive and unfreezes according to the temperature attenuation trajectory. This system can reduce heat misadjustment, fabric stretching, and electrical shock under transitional operating conditions, improving the stability, continuity, and engineering feasibility of the tenter frame process.

Description

Technical Field

[0001] This invention relates to the field of textile setting control technology, specifically to an adaptive and coordinated control system for the operating parameters of a tenter frame. Background Technology

[0002] Tentator machines are generally used for drying, width stabilization, weight adjustment, and heat setting of knitted, woven, and elastic fiber fabrics. The process typically includes fabric feeding, overfeeding, heating in multi-stage setting chambers, cooling, and fabric exit. In industrial settings, chain clamps or needle plates are mostly used to drive the fabric through hot air circulation, segmented chamber heating, and coordinated front and rear speeds to complete the setting process. Common control parameters throughout the process mainly focus on overfeed amount, chamber temperature, fan operation status, and fabric tension at exit, primarily through overfeed adjustment and oven heat balance regulation.

[0003] Chinese patent document CN109137346B discloses an automatic overfeed control method, system, and device for a stenter. The basic idea is to install a distance measuring device at the front of the stenter to measure the fabric distance and compare it with a controller. The controller then compares the fabric distance values ​​to determine whether to tighten or loosen the fabric. A corresponding overfeed control signal is output to adjust the fabric feeding speed of the overfeed device. Furthermore, the disclosed overfeed control signal can be derived from the difference between the actual fabric distance and the standard fabric distance, and input to the overfeed device to adjust its feeding speed. Structurally, this technology mainly consists of a distance measuring device, a controller, and an overfeed device. The distance measuring device acquires the fabric position, the controller performs comparison calculations, and the overfeed device adjusts the feeding speed. The entire control chain revolves around a single feedback relationship between fabric distance and overfeed speed.

[0004] The existing technologies described above can automatically correct overfeed amounts, and the controlled object is mainly the overfeed device before the stenter. The feedback is mainly based on the fabric distance signal. They have a limited applicability in transitional conditions where the stenter operates continuously in multi-stage stenting chambers and there are sudden changes in traction speed, inlet surface density, or process cycle time. This is because the stentering process is not a separate process of controlling the fabric feeding speed, but rather a coupled process of fabric conveying, hot air circulation, chamber heat storage, airflow disturbance, and tension propagation. Within the multi-stage heating chambers, the hot air system, metal walls, and related heat exchange components have thermal inertia, and the internal thermal state cannot change synchronously with the front-end speed. The fabric tension and width are transmitted segment by segment along the transmission path. Adjusting the overfeed speed solely based on changes in fabric distance cannot simultaneously reflect the temporal misalignment between heat retention, changes in the heating process within the chamber, and changes in the fabric's mechanical state under high-temperature conditions.

[0005] If the aforementioned limitations persist, uneven heating, localized tension variations, decreased width stability, and compromised quality consistency during process switching are likely to occur during the stenter's setting process under transitional operating conditions. Therefore, existing technologies still need to improve the coordination of operating parameter adjustments during the transition phase in the coupled operation of multi-stage heating and continuous conveying in the stenter. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an adaptive and coordinated control system for the operating parameters of a tenter frame. This system controls a variable frequency circulating fan to implement micro-eddy current drive within the critical suspension zone to peel off the high-temperature boundary layer on the fabric surface. Subsequently, based on the rheological state of the target setting chamber, the system determines the advance injection time difference of mechanical displacement and issues a reverse tension immune displacement command to the fabric feeding overfeed mechanism. Finally, regenerated reinjection power is allocated within the common DC bus network, and the micro-eddy current drive and defreezing are smoothly withdrawn according to the temperature attenuation trajectory. This system can reduce heat misadjustment, fabric stretching, and electrical shock under transitional operating conditions, improve the stability of the tenter frame process, and solve the technical problems described in the background art.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An adaptive and coordinated control system for operating parameters of a tenter frame is applied to tenter frames with a fabric feeding overfeed mechanism and multiple stenting chambers. Each stenting chamber is coupled to a heat source control valve and a variable frequency circulating fan. The system includes an edge prediction controller, which is configured to: determine the target stenting chamber and the heat integral deviation when the traction speed or inlet surface density changes abruptly, and freeze the low-frequency basic opening of the heat source control valve when the heat integral deviation falls into the pure time-delay thermal dead zone of the heat source control valve. Micro-vortex drive under critical suspension constraint is implemented based on the thermal integral deviation control of the variable frequency circulating fan; the mechanical displacement advance injection time difference is determined according to the rheological state of the target shaped cavity, and a reverse tension immune displacement command is issued to the feeding overfeed mechanism; the micro-vortex drive is canceled and the freeze is lifted after passing the pure time delay thermal dead zone.

[0008] Furthermore, the edge prediction controller freezes the low-frequency basic opening of the heat source control valve only when the heat integral deviation points to the overheating branch and the corresponding occurrence time is within the pure time-delay thermal dead zone, suspends the integral accumulation of the closed loop corresponding to the normal temperature of the target shaped chamber, and writes the transient enthalpy surplus or deficit of the target shaped chamber into the subsequent wind farm takeover task.

[0009] Furthermore, before controlling the variable frequency circulating fan to implement micro eddy current drive, the edge prediction controller first determines the basic aerodynamic pressure of the target shaping chamber based on the inlet surface density, effective width, and effective working area of ​​the nozzle. It then limits the basic aerodynamic pressure to the critical suspension zone that allows the fabric to detach from the lower nozzle guide rail without entering the needle-shedding state. Finally, it maintains the basic frequency command and superimposes the micro eddy current drive within the critical suspension zone.

[0010] Furthermore, the edge prediction controller determines the rheological state based on the hot air temperature and fabric temperature of the target shaping chamber, and determines the mechanical displacement advance injection time difference according to the mechanical propagation path from the fabric feeding overfeed mechanism to the target shaping chamber and the aerodynamic propagation path from the variable frequency circulating fan to the target shaping chamber. Then, it generates and issues a reverse tension immune displacement command based on the mechanical displacement advance injection time difference.

[0011] Furthermore, the edge prediction controller receives the traction speed signal and speed drop pulse from the main drive inverter via the EtherCAT high-speed bus, and writes a control word containing the fundamental frequency command and micro eddy current drive carrier to the corresponding variable frequency circulating fan driver. The control word is sent to the corresponding driver according to the corresponding target shaped cavity.

[0012] Furthermore, the edge predictive controller writes the reverse tension immune displacement command into a mechanical pre-injection queue that is independent of the variable frequency circulating fan control task, and pushes the mechanical pre-injection queue into the EtherCAT distributed clock transmit stack. The transmission time of the mechanical pre-injection queue is earlier than the trigger time of the micro eddy current drive.

[0013] Furthermore, the edge prediction controller receives DC bus voltage and DC side current feedback from multiple variable frequency circulating fan drivers. When multiple variable frequency circulating fans are connected to the common DC bus network, it performs interleaved phase shift low-level modulation on the drivers in the energy absorption and frequency boosting state, and allocates regenerated reinjection power among multiple variable frequency circulating fans.

[0014] Furthermore, the pure time delay time constant corresponding to the pure time delay thermal dead zone is not less than 45 seconds, and the edge prediction controller updates the pure time delay time constant by applying a preset small opening step to the heat source control valve and recording the hot air temperature response of the target shaping chamber.

[0015] Furthermore, the edge prediction controller limits the base aerodynamic pressure to 75% to 95% of the corresponding critical stagnation lift, and maintains the base frequency command of the variable frequency circulating fan to continuously oscillate within this range, so as to keep the fabric in the target shaping chamber in an operating state where it is detached from the lower nozzle guide rail and has not been blown away by the needle.

[0016] Furthermore, the frequency of the micro-eddy current driven carrier is 5Hz to 15Hz, and the edge prediction controller configures this frequency according to the Strouhal number window of 0.18 to 0.22 corresponding to the characteristic diameter of the fabric pores, and superimposes this frequency on the base frequency command corresponding to the base aerodynamic pressure.

[0017] (III) Beneficial Effects This invention provides an adaptive and coordinated control system for the operating parameters of a tenter frame, which has the following beneficial effects: By freezing the low-frequency basic opening of the heat source control valve when the integrated thermal deviation falls into the pure time-delay thermal dead zone, the conventional temperature closed-loop integral accumulation is suspended, preventing slow variables from continuously accumulating adjustment amounts within the ineffective time window. This suppresses heat misadjustment and compensation overshoot under transitional operating conditions at the source. By controlling the micro-vortex drive of the variable frequency circulating fan in the critical suspension zone, the fabric continuously disperses the high-temperature boundary layer on the surface without deviating from the stable operating boundary, ensuring that excess enthalpy stripping is performed by the air field side before the heat source control valve takes effect.

[0018] By determining the advance injection time difference of mechanical displacement based on the rheological state of the target shaping chamber, and simultaneously issuing a reverse tension immune displacement command to the fabric feeding mechanism, the timing of mechanical tension changes and aerodynamic disturbances caused by micro-vortex drive is reorganized, reducing the transient tension of the fabric body in the high-temperature softening state. By setting the air field connection, mechanical pre-injection, and heat source control valve thawing into a continuous single-chain control process, the thermal imbalance, tension imbalance, and exit stabilization process caused by sudden changes in traction speed or inlet surface density are integrated into one execution unit, reducing the changes in operating conditions caused by multi-loop intertwined interference.

[0019] By distributing multiple variable frequency circulating fans to regenerate and reinject electrical energy in the common DC bus network, and combining staggered phase shift modulation and smooth fading-out logic, the electrical impact during the high-frequency pulsation stage and the secondary disturbance during the exit stage are reduced, enabling the entire tenter frame coordinated control system to have a complete engineering closed loop and continuous operation capability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall architecture of the adaptive and coordinated control system for the operating parameters of the tenter frame of the present invention; Figure 2 This is a schematic diagram of the main process of the adaptive and coordinated control method for the operating parameters of the tenter frame of the present invention; Figure 3 This is a timing diagram illustrating the pure time-delay thermal dead zone identification and heat source control valve freezing connection of the present invention. Figure 4 A cross-sectional schematic diagram showing the critical suspension constraint zone and basic aerodynamic pressure of the target shaped chamber of this invention; Figure 5This is a partially enlarged schematic diagram of the micro-eddy current driven carrier injection and high-temperature boundary layer enthalpy stripping of the present invention. Figure 6 This is a schematic diagram of the high-temperature rheological attenuation calculation and the spatiotemporal registration of the mechanical displacement advance injection in this invention; Figure 7 This is a topology diagram of the pooled distribution of regenerative energy from multiple wind turbines under a common DC bus network according to the present invention. Figure 8 This is a timing diagram illustrating the smooth fading of temperature attenuation based on actual temperature measurement and the timing of the freezing and unfreezing sequence of the heat source control valve, as presented in this invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8 This invention provides an adaptive and coordinated control system for the operating parameters of a tenter frame, comprising: Step 1: When a sudden change in traction speed or inlet surface density occurs and the heat source control valve is still in the pure time-delay thermal dead zone, first remove the heat regulation link that will inevitably not take effect in time from the control sequence, and then accurately assign the target shaping chamber and transient enthalpy surplus / deficit required for subsequent high-speed pneumatic compensation to the next step, so as to avoid the fabric from suffering irreversible overheating during the transition period.

[0023] This step is executed by the edge prediction controller. Instead of simply waiting for a temperature deviation to occur before driving the heat source control valve, the controller first identifies the imbalance window where heat has already been injected, the valve cannot immediately shut it off, and the fabric dwell time has changed. The heat transfer chain of the tenter frame essentially consists of the heat source control valve, heat exchange components, air in the setting chamber, and the fabric surface and interior connected in series. The heat source control valve corresponds to a low-frequency, slow variable, the circulating airflow and exhaust damper correspond to fast variables, and the fabric overfeed mechanism corresponds to a mechanical variable. When the preceding disturbance comes from a decrease in traction speed or an increase in inlet surface density, the heated dwell time of the fabric in the target setting chamber changes immediately. Even if the heat source control valve reduces its opening at this moment, its effect will only reach the chamber after passing through a pure time-delay thermal dead zone. Therefore, if the conventional temperature closed-loop continues to integrate, the cooling actions that will only take effect in the future will be continuously piled into the current moment, causing heat integration saturation.

[0024] The edge prediction controller reads the inlet speed signal from the traction roller encoder, the inlet areal density signal from the inlet quantitative scanning roller, and extracts the effective thermal length, target fabric temperature, and current process route from the formula tables of each shaping chamber. Using the difference in inlet speed and the change in inlet areal density before and after the disturbance as feedforward inputs, it directly estimates the deviation in the actual heating process of the fabric in each target shaping chamber, rather than waiting for the chamber temperature probes to slowly reflect the results. The estimation formula is written as: Among them, transient prediction of heat integral deviation : No. The estimated increase or decrease in heat received by a target shaped chamber after disturbance relative to before disturbance, the value of which changes with the direction of vehicle speed change and the direction of inlet surface density change; effective thermal length of the chamber. : No. The path length of the fabric in the effective heating zone within each target shaping chamber is obtained from the equipment layout dimensions or calibration. Equivalent heat capacity coefficient The equivalent thermal response coefficient of a unit fabric under setting conditions is determined by the fabric structure, moisture content, and process formulation; inlet areal density. The current unit area mass of the fabric being fed is given by the inlet quantitative scanning roller or the thickness-width conversion link; the inlet speed before disturbance. Stable entry speed before the disturbance; entry speed after the disturbance. : Current entrance vehicle speed after the disturbance occurs; target temperature : No. The target fabric temperature corresponding to each target shaping chamber; inlet fabric temperature. Measured fabric temperature before the fabric enters the setting chamber.

[0025] The equivalent heat capacity coefficient It is not a fixed constant, but a calibration parameter jointly determined by the fabric type, inlet moisture content, and target shaping process. During the startup modeling stage, the edge prediction controller calls historical stable batch data, calculates the equivalent heat capacity coefficient based on the inlet fabric temperature, target shaping chamber temperature, actual residence time, and actual temperature rise, and writes it into the fabric parameter library. When changing batches, the corresponding fabric entry is called first. If there is no matching entry, it is initialized with an entry of the same material type and similar basis weight, and is recursively corrected in the previous few rolls of fabric in the current batch.

[0026] This formula is used to quickly determine, within the first few control cycles after a disturbance occurs, which target shaping chambers are most likely to overheat and which target shaping chambers only need to maintain their original operating conditions. Consequently, subsequent freezing actions no longer involve uniform cooling of the entire machine, but instead take control of only the selected target shaping chambers one by one, reducing the impact of unrelated chambers being disturbed.

[0027] Obtain the transient prediction heat integral deviation Subsequently, the edge prediction controller continues to read the current position of the heat source control valve, the valve position feedback update timestamp, the heat transfer calibration results of the heat exchange components, and the existing pure time delay of the chamber, and establishes a dead zone determination in the control task. The determination formula is written as: Among them, dead zone marking : Current moment Is the target shaped chamber still in the pure time-delay thermal dead zone where the heat source control valve has not yet taken effect on the heat inside the chamber? At the current moment... : The moment when the edge prediction controller executes this decision; the moment the disturbance begins. The moment when the sudden change in entrance vehicle speed or entrance surface density is confirmed; pure time delay time. : No. The calibration pure time delay of the response from the heat source control valve to the temperature rise inside the target shaped chamber.

[0028] The pure time delay The time delay is obtained through small-step calibration of the heat source control valve. Under the condition that the linear velocity, exhaust damper opening, and fan base frequency of the target shaping chamber remain constant, a preset small-amplitude change in the opening of the heat source control valve is applied, and the response curve of the hot air temperature in the target shaping chamber is recorded. The time difference from the moment of valve position change to the moment when the temperature curve first reaches the preset proportion of the steady-state total change is recorded as the current identification pure delay time. The edge prediction controller then updates this identification value with the historical pure delay time by weighting it to obtain the pure delay time during operation. .

[0029] When dead zone is marked Furthermore, the transient prediction of the integral of heat transfer deviation When overheating accumulates, the edge prediction controller immediately executes three consecutive actions: First, it freezes the low-frequency base opening of the heat source control valve of the target shaped chamber, keeping the valve position at the latch value before the disturbance occurs, and no longer accepts the newly added proportional and integral terms in the conventional temperature closed loop; Second, it suspends the integral accumulation in the conventional temperature closed loop to avoid the accumulation of future cooling commands in advance during the dead zone stage; Third, it outputs the chamber number of the target shaped chamber and the transient enthalpy surplus / deficit that urgently needs to be rapidly stripped, for direct use in the next step.

[0030] The corresponding output expression is written as: Among them, transient enthalpy gain / loss : No. The excess enthalpy of the target shaped chamber needs to be preferentially stripped during the dead zone stage; function Take the larger of the input value and zero, specifically when the transient predicted heat integral deviation... Output transient prediction heat integral deviation when greater than zero Otherwise, output zero, which is used to limit the subsequent high-speed pneumatic compensation to the overheat stripping scenario and prevent the underheat compensation scenario from being triggered.

[0031] In this embodiment, the edge prediction controller does not execute the four-step takeover chain for every transient estimated heat integral deviation in any direction. Instead, it first determines the sign of the transient estimated heat integral deviation. When the transient estimated heat integral deviation is positive, indicating that the target shaping chamber has an overheating risk and that excess enthalpy needs to be stripped within the pure time-delay thermal dead zone, the takeover process of steps one to four is then initiated. When the transient estimated heat integral deviation is not positive, the edge prediction controller does not trigger the rapid pneumatic compensation takeover and keeps the heat source control valve participating in the normal temperature closed loop.

[0032] The aforementioned high-speed aerodynamic compensation interruption refers to a high-priority takeover event issued by the edge prediction controller to the fan control task. Its function is to preempt the conventional shaping air volume task and switch to the micro-vortex drive task in step two. The interruption does not indicate the termination of aerodynamic compensation, but rather the switch from conventional air volume regulation to short-term high-priority aerodynamic takeover.

[0033] For example, when changing orders for a batch of elastic fabric, the traction roller has just switched from its original linear speed to a lower linear speed, and the inlet quantitative scanning roller simultaneously gives a signal of increased areal density. The edge prediction controller, within the same control cycle, determines that the two target shaping chambers in the middle section will experience excessive dwell time. At this point, the visible action is not that all valves close simultaneously, but rather that the selected heat source control valve remains stationary, the integral register of the conventional temperature closed loop stops accumulating, the exhaust damper enters a pre-open state, and the corresponding target shaping chamber number and transient enthalpy surplus / deficit are... It was sent to the subsequent task queue. What the operator saw at the machine was that after the disturbance occurred, the relevant chamber was first locked in place, instead of the valve position swinging wildly immediately. The fabric continued to enter the subsequent chamber along the predetermined route, and there was no erratic movement of the whole machine caused by the misadjustment of multiple chambers.

[0034] The entrance speed signal can be provided by either the traction roller encoder or the laser velocimeter; the entrance surface density signal can be provided directly by the entrance quantitative scanning roller or calculated by the thickness detector, width detector, and fabric variety reference library; the heat source control valve can be a gas proportional valve, a steam regulating valve, or a heat transfer oil regulating valve; the freezing action can be achieved by the edge prediction controller sending a hold command to the valve positioner or by cutting off the conventional temperature closed-loop output write permission, as long as the processing essence of not adding low-frequency basic opening changes within the dead zone is maintained.

[0035] Pure time-delay thermal dead zone calibration and update: First, during the start-up calibration phase, a small step change in the opening degree of a single heat source control valve is applied. While maintaining constant linear velocity, exhaust damper, and fan frequency, the hot air temperature response of the target shaping chamber is recorded. Second, the earliest moment when the temperature begins to deviate significantly from the initial value is defined as the currently identified time-delayed thermal dead zone calibration and update. Third, use exponential smoothing to... Write back to history .

[0036] Furthermore, once the pure time-delay thermal dead zone is clearly defined, the heat source control valve no longer operates repeatedly during the ineffective period, avoiding the misuse of slow variables as fast variables; the integral accumulation of the conventional temperature closed loop is suspended to prevent excessive compensation after the dead zone ends; subsequent steps obtain clearly defined control targets and control strengths, thus enabling rapid pneumatic compensation to be implemented only for target shaped chambers that truly pose an overheating risk.

[0037] Step 2: After confirming in Step 1 that the target shaping chamber is in the pure time-delay thermal dead zone and outputs transient enthalpy surplus / deficit... After that, instead of trying to reduce the excess enthalpy through the heat source control valve, the variable frequency circulating fan was kept in the critical aerodynamic zone where the fabric was suspended and did not derail. Then, a micro eddy current driven carrier wave constrained by the pore size was superimposed, so that the high temperature insulation boundary layer was continuously torn and the excess enthalpy was quickly taken away from the fabric surface.

[0038] This step is still performed by the edge prediction controller, and its inputs directly include the target shaping chamber number, pure time-delay thermal dead zone state, and transient enthalpy surplus / deficit from the output of step one. When the heat source control valve is frozen, the metal walls, heat transfer oil circuit, and heat exchange components inside the shaping chamber continue to release heat, and the high-temperature boundary layer on the fabric surface will not immediately disappear due to the valve position being stationary. If the speed of the variable frequency circulating fan is simply reduced at this time, the fabric will be pressed back onto the lower air nozzle guide rail, and mechanical friction will consume the excitation capacity of the air field; if the air pressure is increased sharply in the opposite direction, the fabric will deviate from the needle chain trajectory, resulting in selvage flapping and weft drift.

[0039] Based on this contradiction, instead of treating the fan as a simple air volume actuator, the variable frequency circulating fan, the air nozzle channel, the fabric pores, and the residual heat inside the target shaping chamber are regarded as a constrained flow-heat coupling interface. By first clamping the basic aerodynamic pressure and then superimposing the micro eddy current driving carrier, the wind field is maintained in a semi-suspended, semi-disturbed controlled state.

[0040] Furthermore, the transient enthalpy surplus / deficit given in step one... This will be transformed into a specific scheduling basis for the wind field intensity and disturbance rhythm of the target shaped chamber.

[0041] The edge prediction controller first obtains the fabric surface density from the inlet quantitative scanning roller. Obtain the effective width from the width detector Obtain the effective working area of ​​the upper and lower air nozzles from the target shaped cavity configuration table. Then, based on the warp or weft knitting type of the fabric, select the corresponding fabric wind resistance coefficient.

[0042] The edge prediction controller, under the condition of keeping the fabric detached from the downwind guide rail without breaking the lateral constraint of the needle chain, back-calculates the critical aerodynamic pressure of the target shaping chamber and converts it into the given fundamental frequency.

[0043] The constraint expression is written as: Among them, basic aerodynamic pressure : No. Each target shaping chamber is used to maintain the reference aerodynamic pressure of the fabric in a controlled suspension state; wind resistance coefficient : No. The correction coefficient, which is formed by the wind-induced posture of the fabric in the target shaping chamber, the angle of the air nozzle, and the leakage at the edge of the fabric width, is preferably in the range of 0.75 to 0.95. This range corresponds to the constraint window where the fabric can still float and has not entered the derailment and blow-off zone. Fabric density Fabric mass per unit area, given by the inlet quantitative scanning roller or thickness conversion link; gravitational acceleration. Gravity constant in the equipment installation scenario; effective span : Current width of the nozzle entering the target shaping chamber; Effective working area of ​​the nozzle : No. The effective area of ​​the upper and lower air nozzles in the target shaping chamber to generate the main lift force on the fabric.

[0044] The wind coefficient The target shaping chamber nozzle spray angle, upper and lower nozzle spacing, width edge leakage, and fabric structure type are jointly determined. During the equipment calibration stage, the critical state where the fabric just leaves the lower nozzle guide rail and there is no needle blow-off is used as the reference state, and the wind coefficient parameter table is established for different fabric types. When the width or fabric type changes during operation, the corresponding entry is called first and small-step corrections can be made based on the air duct pressure difference and the fabric off-rail state.

[0045] The aforementioned constraint does not abstract the fabric into a uniform flat plate, but rather binds the fabric's weight, width distribution, and nozzle coverage area to the same scale to determine the basic aerodynamic pressure. It must not fall below the lower suspension limit, nor cross into the intermediate working zone of the upper blow-off limit. In specific implementation, the edge prediction controller uses a lookup table plus bilinear interpolation to adjust the basic aerodynamic pressure. The command to convert to the base frequency of the variable frequency circulating fan; the table lookup entries consist of three sets of operating conditions: no-load calibration, full-width calibration, and common fabric type calibration; the interpolation variable is selected as the fabric density. With effective width .

[0046] For example, in an eight-chamber tenter frame, after a batch of spandex-containing fabric enters the third target setting chamber, step one has already marked this chamber as the target for removing excess enthalpy. At this point, the visible action is not a sudden surge of the fan, but rather the upper and lower nozzles of the third target setting chamber first lift the fabric a stable distance away from the lower nozzle guide rail, while the fabric edges continue to move smoothly along the needle chain, with no obvious bulges on the fabric surface. This on-site action indicates the basic pneumatic dynamic pressure... It has been locked within the available constraint zone, providing a parent flow field that does not derail the next segment of micro-eddy current driven carrier.

[0047] Basic pneumatic dynamic pressure Once stabilized, the edge prediction controller does not directly issue a smoothing wind reduction command, but instead uses the transient enthalpy surplus / deficit output from step one. Calculate the amplitude of the micro-eddy current driven carrier wave, and based on the characteristic diameter of the fabric pores... Average flow rate at the nozzle outlet Calculate the carrier frequency so that the flow field disturbance falls into the scale band where vortex shedding can be repeatedly formed.

[0048] Its frequency matching equation is written as: Among them, the micro-eddy current carrier frequency : No. The periodic disturbance frequency of the variable frequency circulating fan's underlying control word written into the target shaped chamber; the Strauhal window coefficient. : Eddy shedding scale matching coefficient, preferably in the range of 0.18 to 0.22, is used to keep the disturbance within a window of stable shedding rather than large-scale turbulence; Average flow rate at nozzle outlet : No. The average flow velocity at the outlet of the nozzle in each target shaping chamber is calculated from the fan speed, duct cross-sectional area, and correction factor; the characteristic diameter of the fabric pores. The equivalent pore size that can be formed on the surface of the target fabric due to localized flow-through and shedding is given by the fabric sample library or by the visual pore measurement results before the fabric is mounted.

[0049] The average flow velocity at the nozzle outlet The result is calculated from the differential pressure sensor in the air duct and the cross-sectional area of ​​the nozzle. If the target shaped cavity is equipped with an air duct flow meter, the result from the air duct flow meter takes priority; the characteristic diameter of the fabric pores... The data is preferentially called from the fabric parameter library. If the inlet section is equipped with a backlit vision camera, the fabric texture map collected by the inlet section is obtained by binarization, connected component recognition and equivalent circle diameter conversion, and locked for use during the batch operation.

[0050] The edge prediction controller generates a composite control word consisting of a base frequency command and a micro-eddy current disturbance command, and writes it into the variable frequency circulating fan driver register at a fixed sampling period, so that the fan operates at a predetermined base aerodynamic pressure. It swings back and forth in a narrow range. The disturbance here is not a boundless shaking, but rather a continuous cutting of the high-temperature boundary layer attached to the fabric surface by the flow field, causing the originally sluggish heat exchange interface between the residual heat inside the cavity and the fabric surface to be repeatedly turned upside down.

[0051] As a supplement: the edge prediction controller is based on the transient enthalpy gain / loss output from step one. The amplitude of the micro-eddy current-driven carrier wave is calculated and limited to a preset window that does not cause needle stripping. A larger carrier amplitude indicates that more excess enthalpy needs to be stripped; a smaller carrier amplitude indicates that only boundary layer disturbance needs to be maintained without further enhancing enthalpy stripping. The carrier amplitude does not directly change the base aerodynamic pressure, but rather forms a narrow-amplitude bipolar pulsation superimposed on the base aerodynamic pressure.

[0052] The generation process of the micro-eddy current driven carrier can be carried out in the following order: first, read the characteristic diameter of the fabric pores in the fabric sample library according to the target shaping chamber number. The average flow velocity at the nozzle outlet is then calculated using the duct differential pressure sensor and the fan feedback frequency. Then, substituting into the above formula, the micro-eddy current carrier frequency is obtained. Finally, the frequency is discretized into control cycles that the driver can accept and written into the register. The driver can be either a frequency converter that supports an internal frequency setpoint table or an external pulse width modulation board, as long as it can superimpose periodic perturbations on the fundamental frequency.

[0053] For example, in the aforementioned third target shaping chamber, after the composite control word is executed, the visible fabric surface in the observation window no longer swings dramatically, but instead exhibits fine, continuous, and rapid undulations along the fabric surface. The thermal fog layer near the air nozzle is continuously dispersed, and the fabric color does not continue to shift towards a darker shade. What occurs here is not mechanical beating, but rather a localized shedding flow induced by a micro-eddy current-driven carrier wave that continuously peels away the stagnant air layer near the fabric surface. For knitted fabrics with larger pores, the edge prediction controller preferably uses a lower micro-eddy current carrier frequency. With a wider fundamental frequency swing; for high-density plain weaves with small pores, the edge prediction controller preferably uses a higher micro-eddy current carrier frequency. With a narrower fundamental frequency swing. If the duct differential pressure sensor fails, it can revert to a single-sensor link of fabric pore size + current fan feedback frequency; if visual pore measurement is unavailable, it can directly call the fabric pore characteristic diameter from the fabric pore library. By default, the main chain remains intact.

[0054] Furthermore, the critical suspension constraint band confines the wind field within an intermediate window where it neither presses down on the fabric nor blows it away, providing stable support for subsequent disturbances; the micro-eddy current driven carrier modulates the transient enthalpy surplus or deficit in step one. This is transformed into a directional flow field stripping action, allowing the excess enthalpy in the dead zone to migrate rapidly via the air side.

[0055] Step 3: The basic pneumatic dynamic pressure has been established in Step 2. With micro-eddy current carrier frequency Subsequently, the aerodynamic fast wave that arrives first in the target shaping cavity and the mechanical tension wave that propagates from the fabric feeding mechanism are reordered, so that the two heterogeneous propagations collide in the same spatial grid, thereby eliminating the fabric tension caused by the micro-eddy current driven carrier wave in advance.

[0056] This step is still performed by the edge prediction controller, whose input is directly the basic aerodynamic pressure output from step two. Micro-eddy current carrier frequency With transient enthalpy surplus / deficit In step two, the micro-eddy current-driven carrier wave has already dispersed the high-temperature insulating boundary layer on the surface of the target shaping chamber, but the same disturbance will also locally tighten the suspended fabric. If the fabric is still fed back by the overfeed mechanism after the fan starts operating in the conventional way, the aerodynamic fast wave will have already reached the target shaping chamber, while the mechanical tension wave will still be slowly propagating in the long path of the fabric, eventually forming a misalignment of first being pulled and then being replenished. For fabrics containing spandex or that soften significantly at high temperatures, this misalignment will manifest as selvage pulling, sudden changes in needle chain stress, and instantaneous shrinkage of the fabric width.

[0057] Therefore, this step no longer treats the fabric as a rigid continuum, but incorporates the high-temperature field of the target shaping chamber, the rheological attenuation of the fabric body, the displacement of the overfeed mechanism, and the aerodynamic fast wave triggered by the micro-eddy current driven carrier into the same time frame. First, the degree to which mechanical propagation has slowed down at high temperature is solved, and then the reverse tension immune displacement command is sent into an independent queue in advance so that the slow-arriving mechanical tension wave and the fast-arriving aerodynamic fast wave can cancel each other out synchronously at the target shaping chamber.

[0058] The edge prediction controller first reads high-temperature field parameters from the hot air temperature sensor, fabric infrared thermometer, and formula library of the target shaping chamber, and aligns the timestamps within the same sampling period.

[0059] Subsequently, the edge prediction controller calls the polymer rheological model according to the fabric type. Under conditions near the glass transition region, it uses a Williams-Landel-Ferry form temperature shift factor to first calculate the extent of the stretching of the rheological time axis, and then subtracts the dynamic relaxation modulus decay value of the fabric body in the current high-temperature field based on this. The shift factor is written as: Among them, temperature shift factor : No. The factor by which the viscoelastic response of the fabric body under the target shaping chamber is slowed down relative to the reference state; high temperature field temperature : No. The equivalent fabric temperature within the target shaping chamber is obtained by fusing the hot air temperature sensor and the fabric infrared temperature measuring head; reference temperature. The rheological reference temperature for this fabric in the formula library; Model constants With model constants The Williams-Landel-Ferry constants, pre-set according to the fabric type, are entered into the formula library through sample calibration and are used to determine the sensitivity of temperature changes to time-axis stretching. The model constants... With model constants Instead of being solved online during operation, the model constants in the fabric type parameter library are pre-set by the dynamic thermomechanical analysis results of the corresponding fabric type samples and are stored according to material type, spandex content and structure. The edge prediction controller calls the model constants according to the fabric type entries when changing batches.

[0060] In this embodiment, the edge prediction controller adjusts the temperature shift factor. A combination of fixed-point lookup and single-step interpolation is used to calculate the temperature shift factor, avoiding repeated floating-point exponentiation within the control cycle. Then, the edge prediction controller adjusts the baseline relaxation modulus. The dynamic relaxation modulus decay value is obtained by reduction. The baseline relaxation modulus here. Dynamic relaxation modulus decay value from ambient temperature reference entries in the cloth seed bank This corresponds to the actual stiffness basis of the mechanical tension wave propagating along the warp direction of the fabric under the current high temperature field.

[0061] After obtaining the temperature shift factor, the edge prediction controller does not directly use it as a control variable, but converts it into a dynamic relaxation modulus decay value according to the pre-stored seed rheological parameters. In one embodiment, the dynamic relaxation modulus attenuation value is determined by the room temperature reference relaxation modulus and the temperature shift factor, and is used as input for subsequent mechanical tension wave propagation velocity calculation; the room temperature reference relaxation modulus is given by a fabric sample library, and the entries in the fabric sample library are derived from the dynamic thermomechanical analysis results of the corresponding samples of that fabric sample.

[0062] For example, when a batch of spandex-containing knitted fabrics passes through the fifth target shaping chamber, the fabric can be seen through the observation window being lifted by the micro-eddy current driven carrier wave in step two, accompanied by fine undulations. At this time, the edge prediction controller does not immediately push the fabric overfeed mechanism, but first reads the fabric surface infrared temperature measuring head above the entrance of the fifth target shaping chamber, the hot air temperature sensor at the top of the chamber, and the fabric type library entries, and first converts how much the batch of fabric has softened under the current high temperature field into a dynamic relaxation modulus attenuation value. The operator observes that the fan maintains its predetermined vibration, and the inlet overfeed roller does not exhibit any sudden movement. This on-site sequence corresponds to the principle of first determining the propagation speed and then issuing the displacement.

[0063] After the above processing, the target shaping chamber no longer adopts the assumption of room temperature rigidity, but instead adopts the same dynamic relaxation modulus decay value as the current high-temperature field. .

[0064] Obtain the dynamic relaxation modulus decay value Then, the edge prediction controller reads the length of the fabric path from the fabric feeding mechanism to the entrance of the target shaping chamber and the length of the aerodynamic path from the variable frequency circulating fan to the outlet of the air nozzle of the target shaping chamber. It synchronizes the two paths with the clock and derives the absolute time difference of the advance issuance of the reverse tension immune displacement command according to the propagation speed of the mechanical tension wave in the high temperature softened fabric and the propagation speed of the aerodynamic fast wave in the air duct.

[0065] Its propagation relationship is as follows: Among them, mechanical tension wave velocity : No. The propagation speed of mechanical tension waves in the fabric body corresponds to the shape of each target cavity; dynamic relaxation modulus attenuation value. The effective stiffness of the fabric under the current high-temperature field; equivalent areal density. Equivalent mass per unit area after the span is unfolded; advance injection time difference of mechanical displacement. The reverse tension immune displacement command needs to be issued in advance of the micro-eddy current driven carrier start-up time. Mechanical path length From the overfeeding mechanism to the export of the first... The path length measured along the centerline of the fabric between the entrances of the target shaping chambers; pneumatic path length. From the outlet of the variable frequency circulating fan through the air duct to the first... The equivalent propagation length of the nozzle outlet of the target-shaped cavity; aerodynamic fast wave velocity. The propagation speed of pressure disturbance in the duct is obtained after correction for duct cross-section, hot air state, and structural loss.

[0066] The theoretical value of the mechanical tension wave velocity is only used as an initial value. During the power-on calibration phase, the edge prediction controller applies a small displacement pulse to the fabric feeding mechanism and uses the tension sensor or displacement observation signal at the entrance of the target shaping chamber to identify the actual propagation delay, and then corrects the mechanical tension wave velocity accordingly.

[0067] In one embodiment, both the model constants and the reference temperature are derived from a fabric rheological parameter library, which is established based on the dynamic thermomechanical analysis results of the corresponding fabric samples. The dynamic relaxation modulus decay value is preferably obtained by interpolation according to the fabric temperature-modulus discrete curve. Among them, the dynamic relaxation modulus decay value Indicates fabric type In the The equivalent fabric temperature of the target shaping chamber Effective dynamic relaxation modulus under discrete temperature points; and Indicates fabric type Two adjacent calibration temperature points; discrete modulus points and This represents the dynamic relaxation modulus corresponding to the two calibrated temperature points mentioned above; equivalent fabric body temperature. The definition is given above; Fabric type index. This indicates the fabric type entry corresponding to the current process formula.

[0068] The edge prediction controller calculates the mechanical displacement advance injection time difference. Subsequently, instead of writing the reverse tension immune displacement command into the same output queue as the fan, a mechanical pre-injection queue and a pneumatic triggering queue are divided in the edge control operating system. The mechanical pre-injection queue is preferentially connected to the EtherCAT distributed clock transmission stack, while the pneumatic triggering queue maintains the original fan triggering rhythm; the two queues share the same target shaping chamber number but have different dequeue times. The content of the reverse tension immune displacement command is not simply to increase the overfeed ratio, but to make the servo differential roller of the fabric overfeed mechanism move a limited displacement in the tension reduction direction first, and then return to the formula position after the micro-eddy current driven carrier is started, so that the fabric body forms a counteracting relaxation front in advance.

[0069] For example, in the aforementioned fifth target shaping chamber, the visible sequence of actions on the machine side is as follows: the servo differential roller at the inlet smoothly feeds the fabric forward for a short stroke, causing a slight tension release in the front section of the fabric. Immediately afterwards, the variable frequency circulating fan in the fifth target shaping chamber enters a predetermined micro-eddy current drive carrier cycle. Subsequently, the fabric moves smoothly forward within the observation window, with no abrupt edge pulling on either side of the needle chain. The operator sees the fabric being fed first, followed by the eddy current generation, rather than the eddy current generation followed by fabric replenishment.

[0070] For different equipment structures, this step retains parallel expansion paths: if the fabric feeding overfeed mechanism adopts a servo differential roller structure, the reverse tension immune displacement command is directly written into the servo position loop; if the fabric feeding overfeed mechanism adopts a swing roller fabric storage structure, the reverse tension immune displacement command is replaced with the swing roller target angular displacement, and the output variable still maintains the target shaping chamber number and the time difference between the mechanical displacement advance injection. The output remains unchanged; if the fabric is not near the glass transition, the polymer rheological model switches to the Arrhenius form, but the output is still uniformly the dynamic relaxation modulus decay value. This ensures that the parameter interface between this step and steps two and four remains consistent.

[0071] Furthermore, the equivalent solution of high-temperature rheological decay brings the fabric body back from the empirical value of normal temperature to the current high-temperature working condition; the separation of the mechanical pre-injection queue and the pneumatic triggering queue allows two types of physical processes with different propagation speeds within the same control system to obtain independent queuing positions.

[0072] Step 4: After establishing the micro-eddy current driven carrier and basic aerodynamic pressure in steps 2 and 3... and mechanical displacement advance injection time difference Afterwards, the regenerative power of multiple variable frequency circulating fans on the common DC bus network is directed to the target shaped cavity that still needs to be frequency-enhanced. At the same time, based on the actual temperature measurement changes, the micro-eddy current driven carrier and the frozen state of the heat source control valve are released in a smooth sequence, so that the system converges back to the normal shaped state.

[0073] This step is still executed by the edge prediction controller, whose inputs directly take the target shaping chamber number and transient enthalpy surplus / deficit from the outputs of steps one through three. Basic pneumatic dynamic pressure Micro-eddy current carrier frequency and mechanical displacement advance injection time difference When multiple target-shaped chambers are simultaneously under the action of micro-eddy current driven carrier, some variable frequency circulating fans are in the frequency reduction zone, and the motors will feed energy back to the common DC bus network through the driver; other variable frequency circulating fans are in the frequency increase zone, and need to absorb energy from the common DC bus network.

[0074] If the control is still performed in an isolated manner for each chamber, the power supplied by the frequency reduction fan will first raise the bus voltage, then trigger the braking unit or overvoltage protection, while the frequency increase fan will simultaneously draw power from the AC side again. Meanwhile, if the micro-eddy current drive carrier is removed or the heat source control valve is unfrozen before the temperature has truly dropped, the spatiotemporal control chain constructed in steps one through three will be prematurely severed, causing the fabric to experience residual heat trailing and tension rebound again.

[0075] The edge predictive controller first reads the DC bus voltage, phase current, output frequency, and torque direction markers from each variable frequency circulating fan driver, and sorts the states within the same control cycle, distinguishing between the fan sets in regenerative recovery mode and the fan sets in energy absorption and frequency boosting mode. Then, the edge predictive controller estimates the energy margin of the common DC bus network based on the current micro-eddy current drive carrier amplitude requirements of each target shaped chamber. The estimation formula is written as: Among them, busbar energy margin The difference between regenerated and absorbed electrical energy within the DC bus network at the current moment; number of wind turbines. The total number of variable frequency circulating fans connected to the same DC bus network; regenerative power. : No. The instantaneous power fed back to the common DC bus network by the variable frequency circulating fan during the frequency reduction braking phase; absorbed power. : No. The instantaneous power absorbed by the variable frequency circulating fan from the common DC bus network during the frequency boosting phase; at the current moment. : The sampling time when the edge prediction controller performs the bus energy assessment.

[0076] In this embodiment, the common DC bus network uses stacked copper busbars to connect the DC terminals of multiple variable frequency circulating fan drivers. A DC bus voltage sensor is located in the middle of the bus, and the current and torque direction of a single driver are provided by the driver feedback register. The edge prediction controller detects the bus energy margin... When the DC bus voltage is positive and close to its upper limit, the external braking resistor is not directly activated. Instead, the target shaped cavity in the energy absorption and frequency boosting state is prioritized as the energy receiving object, and the carrier generator of these energy receiving objects is written with staggered phase shift to make the energy absorption pulses offset in electrical angle. The edge prediction controller allocates equally spaced electrical angles to the energy-absorbing wind turbines according to the number of wind turbines currently in the energy absorption and frequency boosting state. The carrier phase of adjacent energy-absorbing wind turbines maintains a fixed phase difference to reduce the bus pulsation peak caused by in-phase energy absorption.

[0077] Furthermore, the energy from the regeneration and reinjection will be directly absorbed by the adjacent frequency-boosting fans along the common DC bus network, rather than accumulating at both ends of the bus capacitor.

[0078] For example, when the second and fourth sections simultaneously execute micro-eddy current driven carrier waves, the variable frequency circulating fan in the second section enters the frequency reduction phase due to disturbance back-off, while the variable frequency circulating fan in the fourth section remains in the frequency increase phase because it still needs to maintain boundary layer stripping. The operator will not see a sudden overvoltage alarm from one of the drives illuminated in front of the status lights on the drive cabinet door; instead, the frequencies of the two drives will alternate, the bus voltage indication will remain smooth, and the fan noise will continue. The actual action occurring here is that the rotor kinetic energy released in the second section is directly absorbed by the fourth section through the common DC bus network.

[0079] If the equipment adopts a common rectifier unit plus multiple inverter units structure, the bus energy margin is... The sampling position is set on the DC side of the common rectifier unit; if the equipment uses multiple independent drivers but reserves parallel bus terminals, the same common DC bus network is formed through the bus coupling module, and the control chain remains unchanged. Through this process, the electrical side effects caused by high-frequency disturbances in step two are constrained and absorbed within the driver's internal loop.

[0080] After the regenerative energy pooling, the edge prediction controller continues to read the actual temperature values ​​of each target shaping chamber and compares them with the end time of the pure time-delay thermal dead zone in step one and the time difference of the mechanical displacement advance injection in step three. The entry and exit criteria are submitted together. The actual temperature measurement value is not obtained using a single air temperature probe, but is composed of a combination of an internal cavity temperature probe and a fabric infrared thermometer.

[0081] Once the edge prediction controller confirms that a target shaped chamber has crossed the pure time delay thermal dead zone and the first derivative of the actual temperature measurement continues to turn in the attenuation direction, it first removes the additional part of the micro-eddy current driven carrier, and then releases the heat source control valve from freezing, so that the heat regulation weight smoothly returns from the fast variable to the low-frequency slow variable.

[0082] Instead of directly calculating the difference for a single sampling point, the edge prediction controller calculates the sliding slope of the real temperature measurement values ​​over the most recent consecutive sampling periods to suppress the influence of hot air disturbance and infrared temperature measurement noise on the exit criterion. When the target shaping chamber has crossed the pure time delay thermal dead zone and the sliding slope remains negative and below the preset threshold for multiple consecutive sampling periods, the edge prediction controller determines that the target shaping chamber has entered the slope exit stage.

[0083] Its reduction weight is written as: Among them, the slope reduction weight : No. The proportion of micro-eddy current driven carrier intensity retained by each target-shaped cavity at the current moment; the slope of the gradient. : No. The steepness or gentleness of the exit process from the target shaped chamber is determined by the fabric type and the dynamic relaxation modulus decay value. The starting time of slope reduction is determined jointly with the mechanical inertia of the wind turbine. : No. The moment when the micro-eddy current driven carrier begins to be removed after the target-shaped cavity meets the exit criterion; current moment. : The sampling time when the edge prediction controller performs the slope calculation.

[0084] The edge prediction controller further relies on the step-down weight. Generate the wind turbine composite command after exiting: Among them, wind turbine composite instructions : No. The final control command for the variable frequency circulating fan driver is currently being written to the target shaped chamber; pulsation command. : Wind turbine commands including micro-eddy current driven carrier waves; basic commands Maintain only the basic aerodynamic pressure Or restore the fan command to the normal shape air volume; reduce the slope weight : The proportion of pulse commands currently retained.

[0085] At the execution level, the edge prediction controller first compiles commands to the wind turbine. According to the reduction weight Gradually reduce the frequency until the pulsating command decays to near the base command level, then restore the low-frequency base opening write permission for the heat source control valve and smoothly release the integrator of the normal temperature closed loop from the frozen value. Because the valve is a low-frequency, slow variable, if the write is restored prematurely, the normal temperature closed loop will re-accumulate before the fabric has completely recovered from the transient disturbance.

[0086] When the slope reduction weight is reduced to below the threshold, the edge prediction controller will write the low-frequency basic opening of the heat source control valve into the permission and simultaneously cancel the mechanical pre-injection queue of the target shaping chamber, and restore the reference position of the fabric overfeeding mechanism to the preset slope to the steady-state formula position, so as to prevent the displacement bias caused by step three from acting on the fabric body again.

[0087] For example, in a target shaping chamber, the operator first observes that the originally fine undulations of the fabric surface in the observation window gradually weaken, the fan sound returns from noticeable vibration to continuous and stable, and then the valve position feedback bar on the drive cabinet begins to change slowly again, the exhaust damper remains in its original position without abrupt changes, and the fabric no longer exhibits edge pulling when exiting the chamber. The internal actions corresponding to this visible sequence are precisely the smooth removal of the micro-eddy current drive carrier wave and the restoration of the heat source control valve's participation.

[0088] Furthermore, the regenerative energy pooling in the common DC bus network enables multiple variable frequency circulating fans to form an internal energy loop during the high-frequency disturbance phase, avoiding concurrent overvoltage of the driver and external energy consumption; the smooth fading based on the actual temperature measurement attenuation ensures that the micro-eddy current drive carrier exit sequence is consistent with the heat recovery sequence; the freezing and unfreezing of the heat source control valve is performed after the fabric body has escaped the strong disturbance, thereby bringing the system back to normal stable operating conditions.

[0089] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0090] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0093] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An adaptive and coordinated control system for the operating parameters of a tenter frame, applied to a tenter frame with a fabric feeding overfeed mechanism and multiple stenting chambers, wherein each stenting chamber is coupled to a heat source control valve and a variable frequency circulating fan, characterized in that, Including an edge prediction controller, which is configured to: determine the target shaping chamber and the heat integral deviation when the traction speed or the inlet surface density changes abruptly, and freeze the low-frequency basic opening of the heat source control valve when the heat integral deviation falls into the pure time-delay thermal dead zone of the heat source control valve; Micro-vortex drive under critical suspension constraint is implemented based on the control of variable frequency circulating fan by heat integral deviation. The mechanical displacement advance injection time difference is determined based on the rheological state of the target shaping chamber, and a reverse tension immune displacement command is issued to the feeding overfeed mechanism; after passing the pure time-delay thermal dead zone, the micro eddy current drive is canceled and the freeze is lifted.

2. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 1, characterized in that: The edge prediction controller freezes the low-frequency basic opening of the heat source control valve, suspends the integral accumulation of the closed loop corresponding to the normal temperature of the target shaped chamber, and writes the transient enthalpy surplus or deficit of the target shaped chamber into the subsequent wind farm takeover task only when the heat integral deviation points to the overheating branch and the corresponding occurrence time is within the pure time-delay thermal dead zone.

3. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 2, characterized in that: Before controlling the variable frequency circulating fan to implement micro eddy current drive, the edge prediction controller first determines the basic aerodynamic pressure of the target shaping chamber based on the inlet surface density, effective width and effective working area of ​​the nozzle, and limits the basic aerodynamic pressure to the critical suspension zone that allows the fabric to detach from the lower nozzle guide rail without entering the needle removal and blow-off state. Then, it maintains the basic frequency command and superimposes the micro eddy current drive within the critical suspension zone.

4. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 3, characterized in that: The edge prediction controller determines the rheological state based on the hot air temperature and fabric temperature of the target shaping chamber, and determines the mechanical displacement advance injection time difference according to the mechanical propagation path from the fabric feeding overfeed mechanism to the target shaping chamber and the aerodynamic propagation path from the variable frequency circulating fan to the target shaping chamber. Then, it generates and issues a reverse tension immune displacement command based on the mechanical displacement advance injection time difference.

5. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 4, characterized in that: The edge prediction controller receives the traction speed signal and speed drop pulse from the main drive inverter via the EtherCAT high-speed bus, and writes a control word containing the fundamental frequency command and micro eddy current drive carrier to the corresponding variable frequency circulating fan driver. The control word is sent to the corresponding driver according to the corresponding target shaped cavity.

6. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 5, characterized in that: The edge prediction controller writes the reverse tension immune displacement command into a mechanical pre-injection queue that is independent of the variable frequency circulating fan control task, and pushes the mechanical pre-injection queue into the EtherCAT distributed clock transmit stack. The transmission time of the mechanical pre-injection queue is earlier than the trigger time of the micro eddy current drive.

7. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 6, characterized in that: The edge prediction controller receives DC bus voltage and DC side current feedback from multiple variable frequency circulating fan drivers. When multiple variable frequency circulating fans are connected to the common DC bus network, it performs interleaved phase shift low-level modulation on the drivers in the energy absorption and frequency boosting state, and allocates regenerated reinjection power among multiple variable frequency circulating fans.

8. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 7, characterized in that: The pure time delay time constant corresponding to the pure time delay thermal dead zone is not less than 45 seconds, and the edge prediction controller updates the pure time delay time constant by applying a preset small opening step to the heat source control valve and recording the hot air temperature response of the target shaping chamber.

9. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 8, characterized in that: The edge prediction controller limits the base aerodynamic pressure to 75% to 95% of the corresponding critical stagnation lift, and keeps the base frequency command of the variable frequency circulating fan continuously oscillating within this range to maintain the fabric in the target shaping chamber in an operating state where it is detached from the lower air nozzle guide rail and has not been blown away by the needle.

10. The adaptive and coordinated control system for the operating parameters of the tenter frame as described in claim 9, characterized in that: The frequency of the micro-eddy current driven carrier is 5Hz to 15Hz, and the edge prediction controller configures this frequency according to the Strouhal number window of 0.18 to 0.22 corresponding to the characteristic diameter of the fabric pores, and superimposes this frequency on the base frequency command corresponding to the base aerodynamic pressure.

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