Batching and feeding device for film blowing machine and using method of batching and feeding device

Abstract

The invention discloses an ingredient feeding device for a film blowing machine and a use method of the ingredient feeding device, and relates to the technical field of plastic forming and film blowing ingredient control. Branch propagation response and residual echo response are obtained by generating a target read-out state sequence, writing a distinguishable detection coding sequence into a plurality of raw material feeding branches and performing decorrelation; and generating a mirror image blanking sequence and an inverse pre-coding write-in sequence, and executing after scheduling and conservation backfilling in combination with a stable phase interval. According to the scheme, the influence of multi-branch time-delay coupling and historical residues on the film blowing quality can be reduced, and the control precision, stability and finished product consistency in the formula switching and disturbance recovery process are improved.

Description

Technical Field

[0001] This invention relates to the field of plastic molding and blown film batching control technology, and more specifically, to a batching and feeding device for a blown film machine and its usage method. Background Technology

[0002] In the blown film production process, changes in the feed rate of multiple raw material feed branches need to go through conveying, plasticizing, mixing, die head flow distribution, film bubble formation, and traction flattening before they manifest as changes in film thickness, uniformity, haze, heat seal strength, or film bubble stability on the film output side. Therefore, the feeding device for blown film machines is not a simple synchronous feeding device, but a controlled object with obvious dynamic propagation characteristics. In existing technologies, a common practice is to directly correct the current feed rate of the corresponding raw material feed branch based on the thickness deviation or other quality deviation detected at the current moment.

[0003] Under the aforementioned control methods, the impact of multiple feed branches on the film output side typically exhibits propagation delay, persistent tailing, and inter-branch coupling characteristics simultaneously. Adjustments made to the feed in a particular feed branch at a given moment are often not immediately reflected in the current test results but gradually become apparent over several subsequent test moments. Furthermore, the effects of multiple feed branches can overlap at the same test moment, making it difficult to accurately attribute a single deviation to a specific feed branch. Simultaneously, historical formulation residues are prevalent in blown film production; materials entering the plasticizing and flow channel systems in previous periods continue to exert a sustained impact on the film output side at multiple subsequent test moments. Existing technologies, which rely solely on direct corrections based on current test values, struggle to simultaneously address the combined effects of multiple branch time delays, cross-coupling, and historical residues.

[0004] The core problem arising from this is that existing feed control methods for blown film machines struggle to establish an accurate and stable correlation between the amount of material written into multiple feed branches and future test results on the film output side. This issue is particularly pronounced during formulation switching, production rate changes, and disturbance recovery phases, easily leading to adjustment lag, overcompensation, repeated oscillations, and film quality fluctuations. This, in turn, prolongs the stabilization and convergence time, increases waste film volume, and reduces finished product consistency. Therefore, a feed control device for blown film machines, capable of pre-writing to future test results while considering the branch propagation response and the influence of historical formulation residues, and its usage method, are needed. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a feeding device for a blown film machine and its usage method.

[0006] To achieve the above objectives, in a first aspect, the present invention provides the following technical solution: a feeding device for a blown film machine, comprising a film output detection unit, a feeding actuator, and a feeding control system, wherein the feeding control system includes: The target readout state sequence generation unit is used to acquire and generate a target readout state sequence for multiple future detection times on the thin film output side based on the target thin film performance requirements, target yield requirements, and predictive control time domain; wherein, the target readout state sequence is a time sequence characterizing the target performance index values ​​of the thin film output side at the multiple future detection times; The detection code writing unit is used to write mutually distinguishable detection code sequences to multiple raw material feed branches, and to ensure that the detection code sequences satisfy the cumulative formula conservation constraint within a preset sliding time window. The output decoding unit is used to perform decorrelation processing on the actual detection results output by the thin film output side of the thin film output detection unit at the current and subsequent multiple detection times to obtain the branch propagation response corresponding to each raw material feed branch and the residual echo response formed by the historical formula residue. An echo mirror generation unit is used to generate a mirror blanking sequence based on the residual echo response; The inverse precoding writing unit is used to solve the inverse precoding writing sequence corresponding to multiple raw material feed branches based on the target readout state sequence, the propagation response of each branch and the mirror blanking sequence, so that the inverse precoding writing sequence is superimposed at multiple future detection times after the raw material transport and blown film forming process to form an output result corresponding to the target readout state sequence. A phase-gated scheduling unit is used to adjust the writing time of each of the inverse precoding write sequences according to the stable phase interval during the blown film process, so that the peak effective interval corresponding to each of the inverse precoding write sequences after propagation through the branch falls into the stable phase interval. The conservation backfill unit is used to perform cumulative amount backfill correction on the probe coding sequence, the mirror blanking sequence, and the inverse precoding write sequence; The execution distribution unit is used to convert the rearranged and corrected inverse precoding write sequence, the probe coding sequence and the mirror blanking sequence after cumulative backfill correction into execution instructions for multiple raw material feeding branches and send them to the batching and feeding execution mechanism to realize feedforward causal inverse write control for future detection results.

[0007] Furthermore, the residual echo response includes at least two of the following components: main tail component, delayed tail component, cross-coupled tail component, and slow decay memory component. Among them, the residual echo response value For the first The raw material feed branch is in the first The equivalent response value on the input side obtained by weighting and combining or equivalently mapping the at least two components at each control moment; The mirrored blanking sequence satisfies: ; in, Indicates the first The raw material feed branch is in the first The mirror blanking sequence values ​​at each control moment; Indicates the first The raw material feed branch is in the first The equivalent residual echo response value on the input side at each control moment; Indicates the first The maximum number of effective historical backtracking steps corresponding to each raw material feed branch; Indicates the historical backtracking step index, ; Indicates corresponding to the first The raw material feed branch is in the first Mirroring weight coefficients on each historical backtracking step; The mirror blanking sequence is used to reverse the persistent impact of historical formulation residues on current and future test results.

[0008] Furthermore, the inverse precoding write unit is used to construct a precoding mode set based on the propagation response of each branch, construct a blanking mode set based on the mirror blanking sequence, select a precoding mode from the precoding mode set, select a blanking mode from the blanking mode set, and determine the basic inverse precoding write mode by combining the precoding mode and the blanking mode. The inverse precoding writing unit is further configured to add a correction writing component to the raw material feed branch whose deviation contribution exceeds a preset threshold on the basic inverse precoding writing mode; wherein, the deviation contribution is an attribution index used to characterize the degree of deviation contribution of the corresponding raw material feed branch to the actual detection result relative to the target readout state sequence, so as to generate inverse precoding writing sequences corresponding to multiple raw material feed branches respectively. The inverse precoding writing unit is also used to constrain the switching frequency of the basic inverse precoding writing mode within multiple consecutive control cycles to not exceed a preset upper limit, so as to reduce the risk of branch coupling amplification and blown film fluctuation caused by mode switching.

[0009] Furthermore, the detection coding writing unit is used to write zero-mean detection coding sequences with low cross-correlation characteristics to multiple raw material feed branches respectively. The detection coding sequence is one or more of positive-negative paired sequences, approximately orthogonal sequences, or pseudo-random sequences. The detection coding sequence includes a first detection component for identifying the main propagation characteristics of the corresponding raw material feed branch and a second detection component for identifying the local response details of the corresponding raw material feed branch. The first detection component and the second detection component partially overlap, alternate in time, or combine the two in terms of time distribution. The detection coding writing unit is also used to stagger the detection coding sequences of different raw material feed branches at their peak writing times to reduce the coupling amplification effect caused by multiple raw material feed branches reaching the detection peak at the same time. The detection coding writing unit is also used to limit the amplitude of the detection coding sequence of each raw material feed branch according to the process stability index of the blown film process, and to adopt a rotating detection coding sequence group for different raw material feed branches in order to reduce the bias effect of fixed detection coding sequence on long-term cumulative formulation. The detection coding sequence satisfies the requirement that the local cumulative feeding deviation of each raw material feeding branch does not exceed the corresponding threshold within a preset short time window, and satisfies the cumulative formula conservation constraint within the preset sliding time window.

[0010] Furthermore, the branch propagation response includes time-domain characteristic parameters and phase-domain characteristic parameters; The time-domain characteristic parameters include at least one or more of arrival delay, peak width, diffusion width, tail length, and attenuation slope, and the phase-domain characteristic parameters include at least one or more of the overlap between the peak effective interval and the stable phase interval, the phase position of the peak center relative to the start of the stable phase interval, and the sensitivity of the output change caused by phase disturbance. The output decoding unit is also used to further decompose the actual detection result into multiple components, the multiple components including at least inter-branch cross-coupling components and residual echo response components; The output decoding unit is also used to determine the residual echo response based on the residual echo response component, and to perform cross-decoupling correction on the time domain characteristic parameters and / or phase domain characteristic parameters of each raw material feed branch based on the cross-coupling component between the branches, so as to distinguish the influence caused by the current raw material feed branch from the influence caused by the historical formula residue.

[0011] Furthermore, the phase gating scheduling unit is used to determine the main write window, the secondary correction window, and the no-entry window based on the stable phase interval and the unstable phase interval during the blown film process, wherein the main write window and the secondary correction window are located within the stable phase interval, and the no-entry window is located within the unstable phase interval; The main write window is used to carry the main inverse precoding write component in the inverse precoding write sequence, the auxiliary correction window is used to carry the correction write component in the inverse precoding write sequence determined according to the mirror blanking sequence, and the forbidden window is used to restrict the peak effective range that causes enhanced membrane bubble fluctuations, traction disturbance sensitivity, or output detection instability from falling into it; The phase-gated scheduling unit is also used to rearrange the peak values ​​of raw material feed branches with coupling conflicts according to the target readout state sequence and the peak effective intervals corresponding to the branch propagation responses of multiple raw material feed branches, and to rearrange the peak values ​​of raw material feed branches that require coordinated compensation, so that the peak effective interval corresponding to the main inverse precoding write component falls into the main write window, and the peak effective interval corresponding to the corrected write component falls into the auxiliary corrected window.

[0012] Furthermore, the conservation backfill unit is used to perform cumulative amount backfill correction on the probe coding sequence, the mirror blanking sequence, and the inverse precoding write sequence using a dual time-scale conservation backfill method; Within the first time scale, the amount of writing corresponding to each raw material feed branch is allowed to be dynamically adjusted based on the current branch propagation response and residual echo response, and the resulting cumulative deviation relative to the target cumulative formula is recorded in the conservation pool state quantity of the corresponding raw material feed branch. Within the second time scale, the conservation backfilling unit performs backfilling compensation, backfilling reduction, and / or delayed backfilling processing on the corresponding raw material feeding branches based on the conservation pool state quantity of each raw material feeding branch, so that the cumulative feeding amount of each raw material feeding branch within the preset sliding time window meets the cumulative formula conservation constraint. The conservation pool state quantity is used to characterize the cumulative excess or deficiency of the corresponding raw material feed branch relative to the target cumulative formula within the first time scale. The target readout state sequence includes a transitional target state sequence, a stable target state sequence, and a disturbance recovery target state sequence set for multiple future detection moments. The target readout state sequence also includes a state switching marker for identifying the switching time between the transition target state sequence, the stable target state sequence and the disturbance recovery target state sequence, so as to indicate that the thin film output side is in the transition stage of convergence to the target thin film performance requirements, the stable stage maintained around the target thin film performance requirements and the recovery stage after disturbance. The target readout state sequence generation unit is also used to select at least one from the transition target state sequence, the stable target state sequence, and the disturbance recovery target state sequence based on the current production status, residual echo response intensity index, and target output requirements, and splice them in time sequence to form a segmented target readout state sequence, so that different production stages correspond to different target readout state constraints.

[0013] Furthermore, it also includes a shadow channel estimation unit, which is used to subtract the reconstructed components corresponding to the time-domain characteristic parameters, the reconstructed components corresponding to the phase-domain characteristic parameters, and the reconstructed components corresponding to the residual echo response from the actual detection results of each raw material feed branch after cross-decoupling correction, based on the actual detection results at multiple detection times on the thin film output side, to obtain the remaining components, and to determine at least one virtual shadow channel response based on the remaining components; the virtual shadow channel response is used to characterize the equivalent disturbance channel response that does not belong to any actual raw material feed branch but can cause changes on the thin film output side; The inverse precoding writing unit is also used to further compensate and correct the inverse precoding writing sequences corresponding to multiple raw material feed branches based on the virtual shadow channel response. The compensation and correction includes at least one of compensation writing amount adjustment, writing time adjustment and peak interval rearrangement, so as to suppress the future detection result offset caused by unmodeled disturbances, sudden operating condition fluctuations or residual effects not stably characterized by the residual echo response.

[0014] Secondly, based on the first aspect, a method for using a feeding device for a blown film machine is proposed, including: Based on the target film performance requirements, target yield requirements, and predictive control time domain, a target readout state sequence for the film output side at multiple detection times is generated; wherein, the target readout state sequence is a time sequence characterizing the target performance index values ​​of the film output side at the multiple detection times; Write mutually distinguishable detection code sequences into multiple raw material feed branches, and ensure that the detection code sequences satisfy the cumulative formula conservation constraint within a preset sliding time window; The actual detection results output by the thin film output detection unit at the current and subsequent multiple detection times are gradually decorrelated to determine the branch propagation response corresponding to each raw material feed branch and the residual echo response formed by historical formula residues. Generate a mirror blanking sequence based on the residual echo response; Based on the target readout state sequence, the propagation response of each branch, and the mirror blanking sequence, the inverse precoding write sequence corresponding to each of the multiple raw material feed branches is solved, so that after the inverse precoding write sequence is processed by raw material transport and blown film forming, an output result corresponding to the target readout state sequence is formed at multiple detection times. Based on the stable phase interval during the blown film process, the writing time of the inverse precoding writing sequence is adjusted so that the peak effective interval corresponding to it after propagation through the branch falls into the stable phase interval. Cumulative backfill correction is performed on the probe coding sequence, the mirror blanking sequence, and the inverse precoding write sequence; The reverse precoding write sequence after rearrangement and backfill correction, the probe coding sequence after cumulative backfill correction, and the mirror blanking sequence are converted into execution instructions for multiple raw material feeding branches and sent to the batching and feeding execution mechanism to realize feedforward causal reverse write control for outputting results at multiple detection times.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, by setting up a target readout state sequence generation unit, a probe coding writing unit, an output decoding unit, an echo mirror generation unit, and an inverse precoding writing unit, the target film performance requirements and target yield requirements are first converted into target readout state sequences for multiple future detection times. Then, mutually distinguishable probe coding sequences are written to multiple raw material feed branches. Based on the actual detection results at the film output side, the branch propagation response corresponding to each raw material feed branch and the residual echo response formed by historical formula residues are obtained through decorrelation. Subsequently, an image blanking sequence is generated and the inverse precoding writing sequence is solved. Thus, an identifiable and calculable mapping relationship is established between the current writing action of multiple raw material feed branches and the future detection results at the film output side. This enables advance compensation for multi-branch time delays, cross-coupling, and historical residues, thereby improving the foresight, accuracy, and convergence speed of blown film quality control.

[0016] 2. In this invention, by setting up a phase-gated scheduling unit, a conservation backfill unit, and an execution distribution unit, the peak effective range of the inverse precoding write sequence is preferentially placed within the stable phase range of the blown film process. Furthermore, the probe coding sequence, mirror blanking sequence, and inverse precoding write sequence are cumulatively backfilled and corrected before being sent for execution. Therefore, the writing process of multiple raw material feed branches can function within a relatively stable time range affecting the film output side, and can maintain cumulative formula conservation within a preset sliding time window. This reduces quality fluctuations, oscillation risks, and raw material ratio deviations during formula switching and disturbance recovery, thereby improving the stability of the film production process, product consistency, and raw material utilization efficiency. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart of the ingredient feeding control method of the present invention. Detailed Implementation

[0018] 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 a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0020] like Figure 1 As shown, this invention provides a feeding device for a blown film machine, applied to a multi-layer co-extrusion blown film production line. The device includes a film output detection unit, multiple raw material feeding branches, a feeding execution mechanism, and a feeding control device. The multi-layer co-extrusion blown film production line can be a five-layer co-extrusion blown film production line, or a three-layer, seven-layer, or other layer co-extrusion blown film production line. The following description uses a five-layer co-extrusion blown film production line as an example. The five raw material feeding branches correspond to the first matrix resin, the second matrix resin, the functional masterbatch, the recycled material, and the additive material, respectively. Each raw material feeding branch includes a storage component, a feeding drive component, and a feeding feedback component. The feeding drive component can be a loss-in-weight feeder, a servo metering screw, or a proportional feeding valve. The feeding feedback component can be one or more of a weighing sensor, a speed feedback unit, and a flow conversion unit, used to obtain the actual feed amount of the corresponding raw material feeding branch.

[0021] The thin film output detection unit is located downstream of the die head forming, bubble stabilization, and traction flattening stages. It continuously outputs the actual detection results from the thin film output side at various detection points. The actual detection results include at least one or more of the following: average thickness, lateral thickness deviation, bubble oscillation amplitude, traction speed fluctuation, die head pressure fluctuation, and melt temperature change. The batching and feeding control device is connected to the thin film output detection unit, the feeding feedback components of each raw material feeding branch, and each feeding drive component. The batching and feeding control device includes an industrial control computer, a programmable logic controller (PLC), input / output acquisition circuits, and a control program. The industrial control computer performs calculations such as target readout state sequence generation, probe code writing, propagation response identification, residual effect estimation, mirror blanking generation, inverse precoding writing solution, phase gating scheduling, conservation backfilling, and shadow channel estimation. The PLC performs timing scheduling, interlocking protection, and command issuance. The input / output acquisition circuits collect detection data and feedback data.

[0022] In this embodiment, the target readout state sequence is a sequence of target output states set for multiple future detection moments. Each moment in the target readout state sequence corresponds to a target performance index value or a set of target performance index values. Target performance index values ​​may include at least one or more of the following: average thickness target, lateral thickness uniformity target, haze target, heat sealing performance target, membrane bubble stability target, production target, and interlayer ratio target. The target readout state sequence can be divided into a transitional target state sequence, a stable target state sequence, and a disturbance recovery target state sequence according to the current production stage. The transitional target state sequence is used for formulation switching, production switching, and large deviation correction stages; the stable target state sequence is used for the steady-state production stage; and the disturbance recovery target state sequence is used for the recovery stage after membrane bubble fluctuations, abnormal head pressure, or external operating condition disturbances. To enable subsequent control processes to distinguish control strategies for different stages, the target readout state sequence may also include a state switching marker, which indicates whether the target state at a certain moment belongs to the transitional stage, the stable stage, or the recovery stage.

[0023] The generation principle of the target readout state sequence is as follows. The batching and feeding control device first reads the target film performance requirements, target yield requirements, and current production status. Then, based on the constraints between various performance indicators, it expands multiple performance indicators into time-series targets for multiple detection moments within the predictive control time domain. When the production task is in the formula switching stage, the batching and feeding control device does not directly adjust all performance indicators to the final target value within one control step. Instead, based on the allowable convergence speed, it distributes the performance indicators along a preset slope to multiple subsequent detection moments, thus forming a transitional target state sequence. When the production task is in the steady-state stage, the batching and feeding control device keeps the target value near the target range, thus forming a stable target state sequence. When membrane bubble fluctuations or die head pressure fluctuations exceed limits, the batching and feeding control device prioritizes allocating the target value corresponding to suppressing the fluctuations, and then gradually pulls other quality indicators back to the normal range, thus forming a disturbance recovery target state sequence. In this way, the target readout state sequence is transformed from a static target value into a time-related target state path, and the write volume of each subsequent raw material feeding branch can be pre-configured around this target state path.

[0024] The batching and feeding control device writes distinguishable detection code sequences to multiple raw material feeding branches. The detection code sequence is a small-amplitude perturbation sequence superimposed on the baseline feed amount of each raw material feeding branch, serving to provide separable input excitation for identifying the propagation patterns of each branch. The mean of the detection code sequence is set to zero to ensure that the positive and negative write amounts within a preset time window cancel each other out, thereby reducing the impact on the long-term cumulative formulation ratio. Different raw material feeding branches use low cross-correlation detection code sequences. Low cross-correlation means that within the preset identification time window, the similarity between the detection codes of each raw material feeding branch is low, making it easier for the detection results on the film output side to distinguish the source of influence of each raw material feeding branch. The detection code sequence can be a positive-negative paired sequence, a pseudo-random sequence, a rotating pulse sequence, or an approximately orthogonal sequence.

[0025] The probe coding sequence for each feed branch can include a first probe component and a second probe component. The first probe component is used to excite the main propagation features, which include the main delay, the main peak response, and the main tail. The second probe component is used to excite local response details, which include local coupling, local oscillations, and long-tail memory effects. The first and second probe components can be arranged in a partially overlapping or time-divisionally alternating manner. The peak write times of the probe coding for different feed branches are staggered. The principle of staggering the peak write times is to reduce the output superposition and confusion caused by multiple feed branches simultaneously applying strong excitation at the same time, thereby making the subsequent propagation response separation clearer.

[0026] The writing of the probe coding sequence is subject to multiple constraints. The first constraint is a short-time window constraint: within a preset short-time window, the absolute value of the local cumulative feed deviation caused by the probe coding for each raw material feed branch does not exceed the corresponding threshold. The second constraint is a sliding time window constraint: within a preset sliding time window, the deviation of the cumulative actual feed amount of each raw material feed branch relative to the target cumulative formula remains within the allowable positive and negative range. The third constraint is a process stability constraint: the batching and feeding control device generates a process stability judgment result based on one or more of the following: membrane bubble oscillation amplitude, short-term fluctuation of traction speed, online thickness fluctuation, and die head pressure fluctuation. When process stability is poor, the batching and feeding control device reduces the amplitude of the probe coding, and if necessary, suspends the writing of probe coding for some raw material feed branches. The fourth constraint is a rotating template constraint: the batching and feeding control device switches between different probe coding templates in adjacent time windows to reduce the chronic bias caused by a long-term fixed template. Through these constraints, the probe coding sequence is transformed from a normal disturbance signal into a probe writing quantity that can be used for identification without significantly disrupting formula conservation and process stability.

[0027] After the film output detection unit continuously outputs actual detection results, the feeding control device identifies the branch propagation response of each raw material feeding branch based on the correlation between the detection code sequence and the actual detection results. The branch propagation response is the temporal pattern by which changes in the feed of a certain raw material feeding branch affect the detected quantity on the film output side after passing through conveying, plasticizing, mixing, distributing, forming, traction, and flattening. The branch propagation response includes at least time-domain characteristic parameters and phase-domain characteristic parameters. Time-domain characteristic parameters include one or more of the following: arrival delay, peak width, diffusion width, tail length, and attenuation slope. Phase-domain characteristic parameters include one or more of the following: the degree of overlap between the peak effective interval and the stable phase interval, the position of the peak center relative to the start of the stable phase interval, and the sensitivity of the output change caused by phase disturbances.

[0028] The formation principle of the branch propagation response is as follows. After the detection code of a certain raw material feed branch passes through the conveying, plasticizing, mixing, and blown film processes, it will form a response trajectory that unfolds over time on the output side. This response trajectory initially exhibits an arrival delay, then a main peak change in the middle stage, and finally a tail decay in the later stage. The batching and feeding control device extracts the delay characteristics, peak characteristics, diffusion characteristics, and decay characteristics from this response trajectory to form a set of time-domain characteristic parameters. At the same time, the batching and feeding control device extracts the occurrence position of this response trajectory in the blown film cycle, the relative position of the peak center and the stable interval, and the amplification degree of process phase disturbances on the output to form a set of phase-domain characteristic parameters. In this way, the complex dynamic changes in the original detection results are converted into propagation response parameters that can be directly used for subsequent control calculations.

[0029] To improve identification accuracy, the batching and feeding control device further decomposes the actual detection results into three components: the direct effect of the current raw material feed branch, the cross-coupling effect between branches, and the residual effect from historical formulations. The cross-coupling effect between branches refers to the portion of the write changes from other raw material feed branches that indirectly affect the current detection result through mixing paths, flow channel distribution, or membrane bubble traction coupling. The residual effect from historical formulations refers to the continued influence of the write amount from previous moments in the current and subsequent moments. Through this decomposition, the batching and feeding control device processes the immediate effect of the current input, the coupling effect from other branches, and the residual effect from historical moments separately, making the subsequent compensation process more targeted.

[0030] The residual effect of historical formulation further forms a residual echo response. This residual echo response comprises two levels. The first level is the output-side residual echo response, representing the persistent impact of historical formulation residues on the output-side detection results. The second level is the input-side equivalent residual echo response value, representing the equivalent compensation amount that needs to be applied on the input side to offset the aforementioned output-side residual effects. The principle of converting the output-side residual echo response into the input-side equivalent residual echo response value is as follows: The batching and feeding control device first determines the input influence amplification relationship, propagation delay relationship, and attenuation relationship corresponding to a certain output residue change based on the identified branch propagation response. Then, it reverses the output-side residual influence to the input side according to this propagation relationship, obtaining an equivalent amount that can be directly used for input compensation. This equivalent amount can be obtained either through proportional conversion or through the inverse mapping relationship of the identified propagation response. Through this conversion, the historical residue amount observed on the output side becomes a compensation basis that can be directly used on the input side.

[0031] The residual echo response preferably consists of at least two of the following: a main tail component, a delayed tail component, a cross-coupled tail component, and a slowly decaying memory component. The main tail component represents the direct residual effect of previous writes from the same raw material feed branch that have not yet decayed completely at the current time. The delayed tail component represents the hysteretic residual effect that appears on the output side only after a longer conveying and mixing path. The cross-coupled tail component represents the residual effect of historical writes from other raw material feed branches that indirectly affect the current output through the coupling path. The slowly decaying memory component represents the slowly decaying effect caused by material residence and remixing in the plasticizing section, flow channel section, and mixing section. The batching and feeding control device determines the magnitude of each component based on the online identification results, and then performs a weighted combination or equivalent mapping of the components to obtain the equivalent residual echo response value on the input side.

[0032] After obtaining the equivalent residual echo response value on the input side, the batching and feeding control device generates a mirror blanking sequence. The raw material feed branch is in the first The mirrored blanking sequence values ​​at each control time point satisfy: ; in, Indicates the first The raw material feed branch is in the first The mirror blanking sequence value at each control moment represents the amount of reverse compensation written to the raw material feed branch at the current moment; Indicates the first The raw material feed branch is in the first The equivalent residual echo response value on the input side at each control moment represents the equivalent influence quantity that remains effective from the historical moment to the current moment. Indicates the first The maximum number of effective historical backtracking steps corresponding to each raw material feed branch is used to limit the historical range of residual echo tracing. This represents the historical backtracking step index, with values ​​representing different control steps traced backward from the current moment. Indicates the first The mirrored hidden content reduction weight coefficients of each raw material feed branch at different backtracking steps are used to describe the contribution of the residue at different historical moments to the current compensation.

[0033] The principle behind the aforementioned mirror blanking sequence is as follows: the equivalent residual echo response values ​​at multiple historical moments still have a continuous impact on the current and future outputs. The batching and feeding control device assigns different weights to these historical residual effects according to their persistence and effectiveness, and then sums them to form the total residual effect. Since the compensation direction is opposite to the residual effect direction, a negative sign is applied before the summation result to obtain the mirror blanking write amount at the current moment. In this way, historical formula residues are canceled out in advance on the input side, and the residual offset on the subsequent output side is significantly reduced.

[0034] After the mirror blanking sequence is generated, the batching and feeding control device calculates the inverse precoding write sequence corresponding to each of the multiple raw material feeding branches based on the target readout state sequence, the branch propagation response of each raw material feeding branch, and the mirror blanking sequence. The inverse precoding write sequence is a write quantity sequence calculated in advance for multiple future control moments. Its function is to ensure that the input changes of each raw material feeding branch, after propagation, form a change trajectory on the output side that matches the target readout state sequence. The formation principle of the inverse precoding write sequence is as follows: The batching and feeding control device first determines the desired output state at each future detection moment based on the target readout state sequence. Then, based on the propagation delay, peak range, and tailing characteristics of each raw material feeding branch, it maps the future output target backward along the time axis to the input side write quantity at the current and multiple future control moments. Since the delay, peak position, and coupling effect of each raw material feeding branch to the output side are different, the inverse precoding write quantity corresponding to different raw material feeding branches is also different. Through this reverse mapping process, the future target state on the output side is transformed into the current and future control writing scheme on the input side.

[0035] To make the inverse precoding writing process more adaptable to different operating conditions, the batching and feeding control device pre-stores several candidate precoding modes and several candidate blanking modes. Candidate precoding modes can include fast tracking mode, smooth transition mode, coupling suppression mode, and steady-state fine-tuning mode. Fast tracking mode is suitable for stages with large deviations and requiring rapid convergence; smooth transition mode is suitable for stages with moderate membrane bubble stability and requiring gradual approach to the target; coupling suppression mode is suitable for stages where multiple feed branches significantly influence each other; steady-state fine-tuning mode is suitable for stages where the output is already close to the target and only requires minor corrections. Candidate blanking modes can include fast blanking mode, slow-release blanking mode, staged blanking mode, and coupling compensation blanking mode. The batching and feeding control device selects a precoding mode that matches the current operating conditions based on the target state change rate, current deviation magnitude, branch propagation delay, coupling strength, process stability, and residual strength; then, based on the dominant component type, tail duration, and compensation space of the residual echo, it selects a blanking mode that matches the current residual characteristics; finally, it combines the selected precoding mode and the selected blanking mode to obtain the basic inverse precoding writing mode.

[0036] After the basic inverse precoding write mode is formed, the batching and feeding control device continues to determine the deviation contribution of each raw material feeding branch to the current output deviation. The deviation contribution represents the degree to which a certain raw material feeding branch is attributed to the current output deviation. The principle for determining the deviation contribution is as follows: The batching and feeding control device compares whether the propagation response direction of a certain raw material feeding branch is consistent with the current output deviation direction, compares whether the influence intensity of the raw material feeding branch on the output change is sufficiently large, and compares whether the residual error contribution still retained by the raw material feeding branch after coupling correction is significant. If at least two of the above three aspects meet the preset conditions, the raw material feeding branch is determined to be a high deviation contribution raw material feeding branch. For high deviation contribution raw material feeding branches, the batching and feeding control device superimposes a correction write component on the basic inverse precoding write mode, thereby enhancing the targeted compensation effect of the raw material feeding branch. To suppress process fluctuations caused by frequent switching of control strategies, the batching and feeding control device also sets an upper limit on the number of basic inverse precoding write mode switching within multiple consecutive control cycles. When the number of switching reaches the upper limit, the current mode is maintained first or a candidate mode with a small difference from the current mode is selected.

[0037] After obtaining the reverse precoding sequence, the writing time needs to be adjusted according to the phase characteristics of the blown film process. The batching and feeding control device first determines the stable phase interval and the unstable phase interval. The stable phase interval is the phase interval where the output is relatively stable during the blown film process and suitable for the main control action. The determination principle of the stable phase interval is as follows: The batching and feeding control device continuously monitors one or more of the following: film bubble oscillation amplitude, short-term fluctuation of traction speed, online thickness fluctuation, die head pressure fluctuation, and melt temperature fluctuation. When the above indicators are all below their respective thresholds for several consecutive control cycles, the time interval is determined to be a stable phase interval; when one or more of the above indicators exceed the corresponding threshold, the time interval is determined to be an unstable phase interval. In this way, the time period of stable process status is converted into a stable window that can be used to arrange the main control action.

[0038] The batching and feeding control device also determines the peak effective interval after writing to each raw material feeding branch. The peak effective interval is the time interval during which a single write to a certain raw material feeding branch has a major impact on the output side. The principle for determining the peak effective interval is as follows: The batching and feeding control device finds the arrival time of the main peak based on the branch propagation response of the raw material feeding branch, and then determines a time interval before and after the main peak based on the peak width and effective influence range. This time interval is the peak effective interval corresponding to the raw material feeding branch. After comparing the peak effective interval with the stable phase interval, the batching and feeding control device divides the future writing period into a main writing window, a secondary correction window, and a forbidden window. The main writing window is located within the stable phase interval and is used to carry the main inverse precoding writing components; the secondary correction window is located within the stable phase interval and is used to carry the correction writing components with smaller amplitudes; the forbidden window is located within the unstable phase interval and is used to avoid the peak effective interval falling into the time period of severe membrane bubble fluctuations and significant detection instability. If the peak effective intervals of multiple raw material feed branches highly overlap in the same time period, leading to output coupling amplification, the batching and feeding control device performs peak staggering rearrangement for these raw material feed branches. If multiple raw material feed branches need to coordinate compensation for the same output deviation, the batching and feeding control device performs peak synchronization rearrangement for these raw material feed branches. Through phase gating scheduling, the inverse precoding write sequence is transformed from a simple numerical sequence into a write instruction sequence that satisfies both the target compensation requirements and adapts to the phase characteristics of the blown film process.

[0039] During the execution of inverse precoding write, probe coding write, and mirror blanking write, short-term over- or under-proportion relative to the target cumulative formulation may occur. To restore long-term formulation conservation while ensuring short-term control effectiveness, the batching feed control device performs cumulative quantity backfill correction on the probe coding sequence, mirror blanking sequence, and inverse precoding write sequence. Cumulative quantity backfill correction employs a dual-timescale processing method. The first timescale is geared towards short-term output control. Within this timescale, the batching feed control device allows each raw material feed branch to dynamically adjust based on the current branch propagation response, residual echo response, and process status, allowing for short-term, small-scale over- or under-proportioning. The second timescale is geared towards long-term cumulative formulation conservation. Within this timescale, the batching feed control device records the cumulative deviation formed by short-term dynamic adjustments as a conservation pool state quantity and performs backfill compensation, backfill reduction, or delayed backfill based on the conservation pool state quantity.

[0040] The conservation pool state variable represents the cumulative excess or deficiency of a certain raw material feed branch relative to the target cumulative formula. A positive conservation pool state variable indicates that the corresponding raw material feed branch has an excessive cumulative feed; a negative conservation pool state variable indicates that the corresponding raw material feed branch has an insufficient cumulative feed. The principle of backfilling is as follows: When the batching and feeding control device detects an excessive cumulative feed in a certain raw material feed branch, it appropriately reduces the amount of feed written to that raw material feed branch during a period when the subsequent process is relatively stable and does not affect the main quality indicators, gradually digesting the excessive cumulative feed. When it detects a deficient cumulative feed in a certain raw material feed branch, it appropriately increases the amount of feed written to that raw material feed branch during a period when the subsequent process is relatively stable and the compensation space allows, gradually making up for the deficient cumulative feed. When the process is in a stage of large fluctuations, the batching and feeding control device postpones the backfilling action. In this way, the cumulative deviation generated by short-term control is converted into a conserved pool state quantity that can be gradually recovered, ultimately keeping the cumulative feed amount of each raw material feed branch within the preset sliding time window within the range allowed by the target cumulative formula.

[0041] In some production scenarios, the identified branch propagation responses and residual echo responses still cannot fully explain the detection changes on the thin film output side. To handle these unmodeled disturbances, the batching and feeding control device sets up a shadow channel estimation process. The principle of the shadow channel estimation process is as follows: The batching and feeding control device first reconstructs the part of the current detection result that can be explained based on the branch propagation response, cross-coupling correction result, and residual echo response of each raw material feeding branch; then, it subtracts the above reconstruction result from the actual detection result to obtain the residual component; if the residual component continuously exceeds the threshold or continuously deviates in a certain direction for multiple consecutive control cycles, it is determined that there is an unmodeled disturbance; the batching and feeding control device establishes a virtual shadow channel response for this unmodeled disturbance, which represents the equivalent influence law of the unmodeled disturbance on the thin film output side. After the virtual shadow channel response is established, the batching and feeding control device compensates and corrects the inverse precoding write sequence of the relevant raw material feeding branch according to the response. The compensation correction can include one or more of the following: compensation write amount adjustment, write time adjustment, and peak interval rearrangement. In this way, unmodeled perturbations are transformed from unexplainable residual errors into additional impact channels that can be equivalently represented and subsequently compensated for.

[0042] After forming the probe coding sequence, mirror blanking sequence, inverse precoding write sequence, correction write component, and conserved backfill amount, the batching and feeding control device generates the final execution command for each raw material feeding branch. The final execution command includes at least the probe write amount, mirror blanking write amount, and inverse precoding write amount after cumulative backfill correction. In one specific embodiment, the final execution command also includes the baseline feed amount, correction write amount, and backfill amount. The principle of forming the final execution command is as follows: The batching and feeding control device summarizes the write amounts that should be executed for each raw material feeding branch at the current control moment according to a unified dimension, forming a target setpoint that can be directly sent to the feeding drive component, and then the programmable controller issues it to the loss-in-weight feeder, servo metering screw, or proportional feed valve. In this way, the propagation information, residual information, and phase information identified by the front end are ultimately implemented into specific feeding adjustment actions.

[0043] The following is a specific application example. In a five-layer co-extrusion blown film production line, the first feed branch corresponds to the first matrix resin, the second feed branch to the second matrix resin, the third feed branch to the functional masterbatch, the fourth feed branch to the recycled material, and the fifth feed branch to the additives. The current production task requires switching from the old formula to a new formula. The new formula requires an increase in the proportion of functional masterbatch in the third feed branch, a decrease in the proportion of recycled material in the fourth feed branch, and requires that thickness uniformity and haze indicators return to the target range within a specified time.

[0044] At the start of the switchover, the batching and feeding control device generates a transitional target state sequence based on the new formulation target and the current production status. This transitional target state sequence progressively advances the thickness uniformity and haze targets to the target range over multiple subsequent detection times. The third and fourth raw material feeding branches are each superimposed with a distinguishable small-amplitude detection code sequence. Based on the progressively output detection results from the film output detection unit, the batching and feeding control device identifies that the third raw material feeding branch has a long tail, and that the fourth raw material feeding branch is more sensitive to lateral thickness deviations. Simultaneously, it identifies that old formulation residues are mainly manifested as a slow-decay memory component related to the third raw material feeding branch and a delayed tail component related to the fourth raw material feeding branch. The feed control device converts the residual effect into an equivalent residual echo response value on the input side and generates a mirror blanking sequence accordingly. Then, based on the transition target state sequence and the branch propagation response of each feed branch, the inverse precoding write sequence is obtained. Subsequently, based on the membrane bubble oscillation and die head pressure changes, a stable phase interval is determined, and the main inverse precoding write amount is assigned to the main write window, while the correction write amount is assigned to the auxiliary correction window. Short-term cumulative deviations formed during the switching process are recorded in the conservation pool state variables and gradually backfilled during the subsequent stabilization phase. After the above processing, the adjustment amounts of the third and fourth feed branches meet both the requirements for eliminating old formula residues and the requirements for switching to the new formula. Thickness uniformity and haze indicators recover to the target range in a short time, and the amount of waste membrane is significantly reduced.

[0045] All parameters described in this embodiment can be set according to specific products, equipment structures, and process requirements. The process stability judgment threshold, local cumulative feed deviation threshold, cumulative formula allowable deviation, conservation pool state quantity trigger threshold, shadow channel establishment threshold, and various mode switching conditions can all be obtained through calibration during the trial production phase, or gradually corrected based on historical data during production. As long as the setting of each parameter follows the aforementioned principles—namely, obtaining separable propagation information through detection coding, obtaining historical residual effects through residual echo estimation, generating reverse compensation writing through mirror blanking, mapping future target states to current and future input writing through inverse precoding, arranging the main control action in the stable window through phase gating, restoring long-term cumulative formula conservation through conservation backfilling, and handling unmodeled disturbances through shadow channels—coordinated control of multiple raw material feed branches can be achieved.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A feeding device for a blown film machine, comprising a film output detection unit, a feeding actuator, and a feeding control system, characterized in that, The batching and feeding control system includes: The target readout state sequence generation unit is used to acquire and generate a target readout state sequence for multiple future detection times on the thin film output side based on the target thin film performance requirements, target yield requirements, and predictive control time domain; wherein, the target readout state sequence is a time sequence characterizing the target performance index values ​​of the thin film output side at the multiple future detection times; The detection code writing unit is used to write mutually distinguishable detection code sequences to multiple raw material feed branches, and to ensure that the detection code sequences satisfy the cumulative formula conservation constraint within a preset sliding time window. The output decoding unit is used to perform decorrelation processing on the actual detection results output by the thin film output side of the thin film output detection unit at the current and subsequent multiple detection times to obtain the branch propagation response corresponding to each raw material feed branch and the residual echo response formed by the historical formula residue. An echo mirror generation unit is used to generate a mirror blanking sequence based on the residual echo response; The inverse precoding writing unit is used to solve the inverse precoding writing sequence corresponding to multiple raw material feed branches based on the target readout state sequence, the propagation response of each branch and the mirror blanking sequence, so that the inverse precoding writing sequence is superimposed at multiple future detection times after the raw material transport and blown film forming process to form an output result corresponding to the target readout state sequence. A phase-gated scheduling unit is used to adjust the writing time of each of the inverse precoding write sequences according to the stable phase interval during the blown film process, so that the peak effective interval corresponding to each of the inverse precoding write sequences after propagation through the branch falls into the stable phase interval. The conservation backfill unit is used to perform cumulative amount backfill correction on the probe coding sequence, the mirror blanking sequence, and the inverse precoding write sequence; The execution distribution unit is used to convert the rearranged and corrected inverse precoding write sequence, the probe coding sequence and the mirror blanking sequence after cumulative backfill correction into execution instructions for multiple raw material feeding branches and send them to the batching and feeding execution mechanism to realize feedforward causal inverse write control for future detection results.

2. The batching and feeding device according to claim 1, characterized in that: The residual echo response includes at least two of the following components: main tail component, delayed tail component, cross-coupled tail component, and slow decay memory component. Among them, the residual echo response value For the first The raw material feed branch is in the first The equivalent response value on the input side obtained by weighting and combining or equivalently mapping the at least two components at each control moment; The mirrored blanking sequence satisfies: ； in, Indicates the first The raw material feed branch is in the first The mirror blanking sequence values ​​at each control moment; Indicates the first The raw material feed branch is in the first The equivalent residual echo response value on the input side at each control moment; Indicates the first The maximum number of effective historical backtracking steps corresponding to each raw material feed branch; Indicates the historical backtracking step index, ; Indicates corresponding to the first The raw material feed branch is in the first Mirroring weight coefficients on each historical backtracking step; The mirror blanking sequence is used to reverse the persistent impact of historical formulation residues on current and future test results.

3. The batching and feeding device according to claim 2, characterized in that: The inverse precoding write unit is used to construct a precoding mode set based on the propagation response of each branch, construct a blanking mode set based on the mirror blanking sequence, select a precoding mode from the precoding mode set, select a blanking mode from the blanking mode set, and determine the basic inverse precoding write mode by combining the precoding mode and the blanking mode. The inverse precoding writing unit is further configured to add a correction writing component to the raw material feed branch whose deviation contribution exceeds a preset threshold on the basic inverse precoding writing mode; wherein, the deviation contribution is an attribution index used to characterize the degree of deviation contribution of the corresponding raw material feed branch to the actual detection result relative to the target readout state sequence, so as to generate inverse precoding writing sequences corresponding to multiple raw material feed branches respectively. The inverse precoding writing unit is also used to constrain the switching frequency of the basic inverse precoding writing mode within multiple consecutive control cycles to not exceed a preset upper limit, so as to reduce the risk of branch coupling amplification and blown film fluctuation caused by mode switching.

4. The batching and feeding device according to claim 1, characterized in that: The probe coding writing unit is used to write zero-mean probe coding sequences with low cross-correlation characteristics to multiple raw material feed branches respectively. The probe coding sequence is one or more of positive and negative paired sequences, approximately orthogonal sequences, or pseudo-random sequences. The detection coding sequence includes a first detection component for identifying the main propagation characteristics of the corresponding raw material feed branch and a second detection component for identifying the local response details of the corresponding raw material feed branch. The first detection component and the second detection component partially overlap, alternate in time, or combine the two in terms of time distribution. The detection coding writing unit is also used to stagger the detection coding sequences of different raw material feed branches at their peak writing times to reduce the coupling amplification effect caused by multiple raw material feed branches reaching the detection peak at the same time. The detection coding writing unit is also used to limit the amplitude of the detection coding sequence of each raw material feed branch according to the process stability index of the blown film process, and to adopt a rotating detection coding sequence group for different raw material feed branches in order to reduce the bias effect of fixed detection coding sequence on long-term cumulative formulation. The detection coding sequence satisfies the requirement that the local cumulative feeding deviation of each raw material feeding branch does not exceed the corresponding threshold within a preset short time window, and satisfies the cumulative formula conservation constraint within the preset sliding time window.

5. The batching and feeding device according to claim 1, characterized in that: The branch propagation response includes time-domain characteristic parameters and phase-domain characteristic parameters; The time-domain characteristic parameters include at least one or more of arrival delay, peak width, diffusion width, tail length, and attenuation slope, and the phase-domain characteristic parameters include at least one or more of the overlap between the peak effective interval and the stable phase interval, the phase position of the peak center relative to the start of the stable phase interval, and the sensitivity of the output change caused by phase disturbance. The output decoding unit is also used to further decompose the actual detection result into multiple components, the multiple components including at least inter-branch cross-coupling components and residual echo response components; The output decoding unit is also used to determine the residual echo response based on the residual echo response component, and to perform cross-decoupling correction on the time domain characteristic parameters and / or phase domain characteristic parameters of each raw material feed branch based on the cross-coupling component between the branches, so as to distinguish the influence caused by the current raw material feed branch from the influence caused by the historical formula residue.

6. The batching and feeding device according to claim 5, characterized in that: The phase gating scheduling unit is used to determine the main write window, the secondary correction window, and the no-entry window based on the stable phase interval and the unstable phase interval during the blown film process, wherein the main write window and the secondary correction window are located within the stable phase interval, and the no-entry window is located within the unstable phase interval; The main write window is used to carry the main inverse precoding write component in the inverse precoding write sequence, the auxiliary correction window is used to carry the correction write component in the inverse precoding write sequence determined according to the mirror blanking sequence, and the forbidden window is used to restrict the peak effective range that causes enhanced membrane bubble fluctuations, traction disturbance sensitivity, or output detection instability from falling into it; The phase-gated scheduling unit is also used to rearrange the peak values ​​of raw material feed branches with coupling conflicts according to the target readout state sequence and the peak effective intervals corresponding to the branch propagation responses of multiple raw material feed branches, and to rearrange the peak values ​​of raw material feed branches that require coordinated compensation, so that the peak effective interval corresponding to the main inverse precoding write component falls into the main write window, and the peak effective interval corresponding to the corrected write component falls into the auxiliary corrected window.

7. The batching and feeding device according to claim 6, characterized in that: The conservation backfill unit is used to perform cumulative amount backfill correction on the probe coding sequence, the mirror blanking sequence, and the inverse precoding write sequence using a dual time-scale conservation backfill method; Within the first time scale, the amount of writing corresponding to each raw material feed branch is allowed to be dynamically adjusted based on the current branch propagation response and residual echo response, and the resulting cumulative deviation relative to the target cumulative formula is recorded in the conservation pool state quantity of the corresponding raw material feed branch. Within the second time scale, the conservation backfilling unit performs backfilling compensation, backfilling reduction, and / or delayed backfilling processing on the corresponding raw material feeding branches based on the conservation pool state quantity of each raw material feeding branch, so that the cumulative feeding amount of each raw material feeding branch within the preset sliding time window meets the cumulative formula conservation constraint. The conservation pool state quantity is used to characterize the cumulative excess or deficiency of the corresponding raw material feed branch relative to the target cumulative formula within the first time scale.

8. The batching and feeding device according to claim 1, characterized in that: The target readout state sequence includes a transitional target state sequence, a stable target state sequence, and a disturbance recovery target state sequence set for multiple future detection times. The target readout state sequence also includes a state switching marker for identifying the switching time between the transition target state sequence, the stable target state sequence and the disturbance recovery target state sequence, so as to indicate that the thin film output side is in the transition stage of convergence to the target thin film performance requirements, the stable stage maintained around the target thin film performance requirements and the recovery stage after disturbance. The target readout state sequence generation unit is also used to select at least one from the transition target state sequence, the stable target state sequence, and the disturbance recovery target state sequence based on the current production status, residual echo response intensity index, and target output requirements, and splice them in time sequence to form a segmented target readout state sequence, so that different production stages correspond to different target readout state constraints.

9. The batching and feeding device according to claim 5, characterized in that: It also includes a shadow channel estimation unit, which is used to subtract the reconstructed components corresponding to the time-domain characteristic parameters, the reconstructed components corresponding to the phase-domain characteristic parameters, and the reconstructed components corresponding to the residual echo response from the actual detection results of each raw material feed branch after cross-decoupling correction, based on the actual detection results of multiple detection times at the thin film output side, to obtain the remaining components, and to determine at least one virtual shadow channel response based on the remaining components; the virtual shadow channel response is used to characterize the equivalent disturbance channel response that does not belong to any actual raw material feed branch but can cause changes on the thin film output side; The inverse precoding writing unit is also used to further compensate and correct the inverse precoding writing sequences corresponding to multiple raw material feed branches based on the virtual shadow channel response. The compensation and correction includes at least one of compensation writing amount adjustment, writing time adjustment and peak interval rearrangement, so as to suppress the future detection result offset caused by unmodeled disturbances, sudden operating condition fluctuations or residual effects not stably characterized by the residual echo response.

10. A method of using a feeding device for a blown film machine, characterized in that, include: Based on the target film performance requirements, target yield requirements, and predictive control time domain, a target readout state sequence for the film output side at multiple detection times is generated; wherein, the target readout state sequence is a time sequence characterizing the target performance index values ​​of the film output side at the multiple detection times; Write mutually distinguishable detection code sequences into multiple raw material feed branches, and ensure that the detection code sequences satisfy the cumulative formula conservation constraint within a preset sliding time window; The actual detection results output by the thin film output detection unit at the current and subsequent multiple detection times are gradually decorrelated to determine the branch propagation response corresponding to each raw material feed branch and the residual echo response formed by historical formula residues. Generate a mirror blanking sequence based on the residual echo response; Based on the target readout state sequence, the propagation response of each branch, and the mirror blanking sequence, the inverse precoding write sequence corresponding to each of the multiple raw material feed branches is solved, so that after the inverse precoding write sequence is processed by raw material transport and blown film forming, an output result corresponding to the target readout state sequence is formed at multiple detection times. Based on the stable phase interval during the blown film process, the writing time of the inverse precoding writing sequence is adjusted so that the peak effective interval corresponding to it after propagation through the branch falls into the stable phase interval. Cumulative backfill correction is performed on the probe coding sequence, the mirror blanking sequence, and the inverse precoding write sequence; The reverse precoding write sequence after rearrangement and backfill correction, the probe coding sequence after cumulative backfill correction, and the mirror blanking sequence are converted into execution instructions for multiple raw material feeding branches and sent to the batching and feeding execution mechanism to realize feedforward causal reverse write control for outputting results at multiple detection times.

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