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CN-122008528-A - Batching and feeding device for film blowing machine and using method of batching and feeding device

CN122008528ACN 122008528 ACN122008528 ACN 122008528ACN-122008528-A

Abstract

The invention discloses a batching feeding device for a film blowing machine and a using method thereof, which relate to the technical field of plastic molding and film blowing batching control and are characterized in that a target read-out state sequence is generated, distinguishable detection coding sequences are written into a plurality of raw material feeding branches, the decorrelation obtains branch propagation response and residual echo response, generates a mirror image blanking sequence and an inverse pre-coding writing sequence, and performs scheduling and conservation backfilling in combination with a stable phase interval. According to the scheme, the influence of multi-branch time-lag coupling and historical residue on film blowing quality can be reduced, and the control precision, stability and finished product consistency in the formula switching and disturbance recovery processes are improved.

Inventors

  • LIU ZHAOBIN

Assignees

  • 江苏新鲁新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. The utility model provides a batching feed mechanism for inflation film manufacturing machine, includes film output detecting element, batching feeding actuating mechanism and batching feeding control system, its characterized in that, batching feeding control system includes: The system comprises a target read-out state sequence generating unit, a target read-out state sequence generating unit and a target read-out state sequence generating unit, wherein the target read-out state sequence generating unit is used for acquiring and generating a target read-out state sequence of a plurality of detection moments in the future of a film output side according to target film performance requirements, target yield requirements and a prediction control time domain, and the target read-out state sequence is a time sequence representing target performance index values of the film output side at the plurality of detection moments in the future; The detection coding writing unit is used for writing mutually distinguishable detection coding sequences into the raw material feeding branches respectively, and enabling the detection coding sequences to meet the accumulated formula conservation constraint in a preset sliding time window; The output decoding unit is used for performing decorrelation processing on actual detection results which are output by the film output side and output by the film output detection unit at the current and subsequent detection moments step by step, so as to obtain branch propagation responses corresponding to all raw material feeding branches and residual echo responses formed by historical formula residues; An echo image generating unit, configured to generate an image blanking sequence according to the residual echo response; The reverse pre-coding writing unit is used for solving reverse pre-coding writing sequences corresponding to a plurality of raw material feeding branches respectively according to the target reading state sequence, each branch propagation response and the mirror image blanking sequence, so that the reverse pre-coding writing sequences are overlapped at a plurality of detection moments in the future to form an output result corresponding to the target reading state sequence after raw material transmission and film blowing forming processes; The phase gating scheduling unit is used for adjusting the writing time of each reverse precoding writing sequence according to a stable phase interval in the film blowing process so that a peak value effective interval corresponding to each reverse precoding writing sequence after being propagated through the branch circuit falls into the stable phase interval; The conservation backfill unit is used for performing accumulation backfill correction on the detection coding sequence, the mirror image blanking sequence and the reverse precoding writing sequence; And the execution distribution unit is used for converting the rearranged and corrected reverse pre-coding writing sequence, the accumulated quantity backfill corrected detection coding sequence and the mirror image blanking sequence into execution instructions of a plurality of raw material feeding branches and issuing the execution instructions to the burdening feeding execution mechanism so as to realize feedforward type causal reverse writing control facing future detection results.
  2. 2. The ingredient feed arrangement of claim 1 wherein the residual echo response includes at least two of a main-tail component, a delayed-tail component, a cross-coupled-tail component, and a slow-decay memory component; wherein the residual echo response value Is the first The raw material feeding branch is at the first The input side equivalent response value is obtained after the weighted combination or equivalent mapping of the at least two components is carried out at each control moment; The mirror blanking sequence satisfies: ; Wherein, the Represent the first The raw material feeding branch is at the first Mirror image blanking sequence values for each control instant; represent the first The raw material feeding branch is at the first Equivalent residual echo response values of the input side at each control moment; represent the first The maximum effective historical backtracking step number corresponding to each raw material feeding branch; representing a historical backtracking step index, ; The representation corresponds to the first The raw material feeding branch is at the first Mirror image blanking weight coefficients on historical backtracking steps; the mirror image blanking sequence is used for reversely counteracting the continuous influence of the historical formula residues on the current and future detection results.
  3. 3. The apparatus of claim 2, wherein the inverse precoding writing unit is configured to construct a precoding pattern set according to each of the branch propagation responses, construct a blanking pattern set according to the mirror blanking sequence, select a precoding pattern from the precoding pattern set, select a blanking pattern from the blanking pattern set, and determine a basic inverse precoding writing pattern by combining the precoding pattern and the blanking pattern; The reverse precoding writing unit is further configured to superimpose and correct a writing component on a raw material feeding branch with a deviation contribution degree exceeding a preset threshold value in the basic reverse precoding writing mode, where the deviation contribution degree is an attribution index for representing a deviation contribution degree of an actual detection result of a corresponding raw material feeding branch relative to the target readout state sequence, so as to generate reverse precoding writing sequences corresponding to a plurality of raw material feeding branches respectively; The reverse precoding writing unit is also used for restraining the switching frequency of basic reverse precoding writing modes in a plurality of continuous control periods from exceeding a preset upper limit so as to reduce the branch coupling amplification risk and film blowing fluctuation caused by mode switching.
  4. 4. The dispensing feeding device of claim 1, wherein the detection code writing unit is configured to write zero-mean detection code sequences with low cross-correlation properties to the plurality of raw material feeding branches, respectively, the detection code sequences being one or more of positive and negative pairing sequences, near orthogonal sequences, or pseudo random sequences; The detection coding sequence comprises a first detection component for identifying the main propagation characteristics of the corresponding raw material feeding branch and a second detection component for identifying the local response details of the corresponding raw material feeding branch, wherein the first detection component and the second detection component are partially overlapped, time-sharing alternate or combined in time distribution; The detection code writing unit is also used for limiting the detection code sequence amplitude of each raw material feeding branch according to the process stability index of the film blowing process, and adopting a rotation type detection code sequence group for different raw material feeding branches so as to reduce the bias influence of a fixed detection code sequence on a long-term accumulated formula; the detection coding sequence meets the condition that the local accumulated feeding deviation of each raw material feeding branch does not exceed a corresponding threshold value in a preset short time window, and meets the accumulated formula conservation constraint in the preset sliding time window.
  5. 5. The ingredient feed arrangement according to claim 1, wherein the branch propagation response comprises a time domain characteristic parameter and a phase domain characteristic parameter; Wherein the time domain characteristic parameters at least comprise one or more of arrival delay, peak width, diffusion width, tailing length and attenuation slope, and the phase domain characteristic parameters at least comprise one or more of overlapping degree of peak effective interval and stable phase interval, phase position of peak center relative to start point of stable phase interval and sensitivity of output variation caused by phase disturbance; The output decoding unit is further used for further decomposing the actual detection result into a plurality of components, wherein the components at least comprise inter-branch cross-coupling components and residual echo response components; the output decoding unit is further used for determining a residual echo response according to the residual echo response component, and performing cross decoupling correction on time domain characteristic parameters and/or phase domain characteristic parameters of each raw material feeding branch according to the inter-branch cross coupling component so as to distinguish the influence caused by the current raw material feeding branch from the influence caused by the historical formula residue.
  6. 6. The dispensing feeding device of claim 5, wherein the phase gating and scheduling unit is configured to determine a main write window, an auxiliary correction window, and a forbidden write window according to a stable phase interval and an unstable phase interval in a film blowing process, wherein the main write window and the auxiliary correction window are located in the stable phase interval, and the forbidden write window is located in the unstable phase interval; the main writing window is used for bearing a main reverse precoding writing component in a reverse precoding writing sequence, the auxiliary correcting window is used for bearing a correcting writing component determined according to the mirror image blanking sequence in the reverse precoding writing sequence, and the forbidden writing window is used for limiting a peak effective interval which leads film bubble fluctuation to be enhanced, traction disturbance to be sensitive or output detection to be unstable to fall into the peak effective interval; The phase gating scheduling unit is further configured to perform peak-to-peak staggered rearrangement on the raw material feeding branches with coupling conflicts according to the target readout state sequence and peak effective intervals corresponding to branch propagation responses of the multiple raw material feeding branches, and perform peak synchronous rearrangement on the raw material feeding branches to be compensated cooperatively, so that the peak effective interval corresponding to the main inverse precoding writing component falls into the main writing window, and the peak effective interval corresponding to the correction writing component falls into the auxiliary correction window.
  7. 7. The dispensing feeding device of claim 6, wherein the conservation backfill unit is configured to perform accumulated backfill correction on the detection code sequence, the mirror image blanking sequence, and the reverse pre-encoded write sequence using a dual time scale conservation backfill approach; In the first time scale, allowing the corresponding writing quantity of each raw material feeding branch to be dynamically adjusted according to the current branch propagation response and the residual echo response, and recording the formed accumulated deviation relative to the target accumulated formula into the conservation pool state quantity of the corresponding raw material feeding branch; in a second time scale, the conservation backfill unit executes backfill compensation, backfill reduction and/or delayed backfill treatment on the corresponding raw material feeding branch according to the conservation pool state quantity of each raw material feeding branch so that the accumulated feeding quantity of each raw material feeding branch in a preset sliding time window meets the accumulated formula conservation constraint; Wherein the conservation pool state quantity is used to characterize an accumulated excess or an accumulated deficiency of the corresponding feedstock feed leg relative to a target accumulated recipe over the first time scale.
  8. 8. The ingredient feed arrangement according to claim 1, wherein the target readout state sequence comprises a transition target state sequence, a steady target state sequence and a disturbance recovery target state sequence set for a plurality of detection moments in the future; The target readout state sequence further comprises a state switching mark for identifying switching moments among the transition target state sequence, the stable target state sequence and the disturbance recovery target state sequence, so as to indicate that the film output side is in a transition stage converging to the target film performance requirement, a stable stage maintaining around the target film performance requirement and a disturbed recovery stage; The target read state sequence generation unit is further used for selecting at least one from the transition target state sequence, the stable target state sequence and the disturbance recovery target state sequence according to the current production state, the residual echo response intensity index and the target yield requirement, and splicing the transition target state sequence, the stable target state sequence and the disturbance recovery target state sequence according to the time sequence to form a segmented target read state sequence, so that different production stages respectively correspond to different target read state constraints.
  9. 9. The apparatus of claim 5, further comprising a shadow channel estimation unit, wherein the shadow channel estimation unit is configured to subtract, from the actual detection result, a reconstructed component corresponding to the time domain characteristic parameter, a reconstructed component corresponding to the phase domain characteristic parameter, and a reconstructed component corresponding to the residual echo response after the cross decoupling correction of each raw material feeding branch from the actual detection result according to the actual detection results of the thin film output side corresponding to the plurality of detection times, so as to obtain a residual component, and determine at least one virtual shadow channel response according to the residual component; The reverse pre-coding writing unit is further used for carrying out further compensation correction on reverse pre-coding writing sequences corresponding to the raw material feeding branches respectively according to the virtual shadow channel response, wherein the compensation correction at least comprises one of compensation writing quantity adjustment, writing time adjustment and peak interval rearrangement so as to inhibit future detection result offset caused by unmodeled disturbance, burst working condition fluctuation or residual influence which is not stably characterized by the residual echo response.
  10. 10. The application method of the batching and feeding device for the film blowing machine is characterized by comprising the following steps of: Generating a target read state sequence of the film output side at a plurality of detection moments according to the target film performance requirement, the target yield requirement and a prediction control time domain, wherein the target read state sequence is a time sequence for representing target performance index values of the film output side at the plurality of detection moments; Respectively writing detection coding sequences which can be distinguished from each other into a plurality of raw material feeding branches, and enabling the detection coding sequences to meet the constraint of accumulated formula conservation in a preset sliding time window; performing decorrelation processing on actual detection results which are output by a film output side and are output by a film output detection unit step by step at a plurality of current and subsequent detection moments, and determining branch propagation responses corresponding to all raw material feeding branches and residual echo responses formed by historical formula residues; generating a mirror blanking sequence according to the residual echo response; According to the target read-out state sequence, each branch propagation response and the mirror image blanking sequence, solving the reverse pre-coding writing sequences respectively corresponding to a plurality of raw material feeding branches, so that after the reverse pre-coding writing sequences are subjected to raw material transmission and film blowing forming, output results corresponding to the target read-out state sequence are formed at a plurality of detection moments; According to a stable phase interval in the film blowing process, the writing time of the reverse pre-coding writing sequence is adjusted so that a peak value effective interval corresponding to the reverse pre-coding writing sequence after the reverse pre-coding writing sequence is transmitted by a branch circuit falls into the stable phase interval; performing accumulated backfill correction on the detection coding sequence, the mirror image blanking sequence and the inverse precoding writing sequence; And converting the reverse pre-coding writing sequence after rearrangement and backfill correction, the detection coding sequence after accumulated backfill correction and the mirror image blanking sequence into execution instructions of a plurality of raw material feeding branches, and issuing the execution instructions to a batching feeding executing mechanism so as to realize feedforward type causal reverse writing control facing to output results of a plurality of detection moments.

Description

Batching and feeding device for film blowing machine and using method of batching and feeding device Technical Field The invention relates to the technical field of plastic molding and film blowing ingredient control, in particular to an ingredient feeding device for a film blowing machine and a using method thereof. Background In the film blowing production process, the change of the feeding amount of a plurality of raw material feeding branches is required to be conveyed, plasticized, mixed, distributed by a machine head runner, formed by film bubble and pulled to be flattened, and then the change of thickness, uniformity, haze, heat sealing strength or film bubble stability is shown on the output side of the film. Thus, the dosing device for a film blowing machine is not a simple synchronous feeding device, but a controlled object with obvious dynamic propagation characteristics. In the prior art, the common practice is to directly perform feedback correction on the current feeding quantity of the corresponding raw material feeding branch according to the thickness deviation or other quality deviations detected at the current moment. In the above control scheme, the effect of multiple raw material feed legs on the output side of the film typically has both propagation delay, continuous tailing and inter-leg coupling characteristics. The feeding adjustment of a raw material feeding branch circuit at the current moment is often not immediately reflected in the current detection result, but gradually appears at a plurality of subsequent detection moments, and the effects of a plurality of raw material feeding branch circuits are overlapped at the same detection moment, so that single deviation is difficult to accurately attribute to a specific raw material feeding branch circuit. Meanwhile, the problem of historical formula residue also commonly exists in film blowing production, and materials entering a plasticizing system and a runner system in the previous period can continuously influence the output side of the film at a plurality of subsequent detection moments. In the prior art, if the direct correction is performed only according to the current detection value, the combined actions of multi-branch time lag, cross coupling and historical residue are difficult to process simultaneously. The key problem caused by the method is that the existing control mode of batching and feeding of the film blowing machine is difficult to enable accurate and stable corresponding relation to be formed between the writing quantity of a plurality of raw material feeding branches and future detection results of the output side of the film. The problems are particularly prominent in the formulation switching, yield changing and disturbance recovery stages, and are easy to cause adjustment lag, excessive compensation, repeated oscillation and film quality fluctuation, so that the stable convergence time is prolonged, the waste film quantity is increased, and the consistency of finished products is reduced. Therefore, a material-mixing and feeding device for a film blowing machine and a using method thereof are needed, wherein the material-mixing and feeding device can write in advance towards future detection results and consider the influence of branch propagation response and historical formula residue. Disclosure of Invention Aiming at the defects in the prior art, the invention aims to provide a batching and feeding device for a film blowing machine and a using method thereof. In order to achieve the above purpose, the invention provides a dosing and feeding device for a film blowing machine, which comprises a film output detection unit, a dosing and feeding executing mechanism and a dosing and feeding control system, wherein the dosing and feeding control system comprises: The system comprises a target read-out state sequence generating unit, a target read-out state sequence generating unit and a target read-out state sequence generating unit, wherein the target read-out state sequence generating unit is used for acquiring and generating a target read-out state sequence of a plurality of detection moments in the future of a film output side according to target film performance requirements, target yield requirements and a prediction control time domain, and the target read-out state sequence is a time sequence representing target performance index values of the film output side at the plurality of detection moments in the future; The detection coding writing unit is used for writing mutually distinguishable detection coding sequences into the raw material feeding branches respectively, and enabling the detection coding sequences to meet the accumulated formula conservation constraint in a preset sliding time window; The output decoding unit is used for performing decorrelation processing on actual detection results which are output by the film output side and output by the film output detection unit at the current and