Composite film traction machine and control method thereof

Abstract

The invention relates to the technical field of equipment control, in particular to a composite film traction machine and a control method thereof, and solves the technical problems of swinging and inaccurate trimming operation caused by overlong suspended film in the film production process. According to the scheme, the device comprises a physical device and a control device, wherein the physical device is compactly arranged along a film advancing path through a traction wallboard, a traction guide roller assembly, a traction trimming assembly and a traction roller assembly so as to shorten a suspended film section; the control device obtains film edge position and transverse displacement data in real time through the film state acquisition module, the swing analysis module processes the data and generates a swing index, the trimming control decision module generates a control instruction according to the index, and the execution and feedback module drives the gas tank assembly or the servo motor to adjust trimming action and feed back calibration. And closed-loop control is formed. Through the synergistic effect of structure optimization and intelligent control, the edge cutting precision and the winding uniformity are improved.

Description

Technical Field

[0001] This invention relates to the field of equipment control technology, and in particular to a composite membrane traction machine and its control method. Background Technology

[0002] Existing traction machines suffer from the following technical challenges: In continuous film production lines, the edge-cutting device is typically fixed to the traction wall panel, resulting in an unsupported, suspended film section between the edge-cutting blade and the film path. When the production line operates at high speed, this excessively long suspended film section can sway or drift laterally due to airflow and equipment vibration. This unstable motion causes the film edge to continuously change position relative to the edge-cutting blade, making it impossible for the blade's cutting trajectory to match the actual swaying edge of the film. This ultimately leads to uneven edges, burrs, or even failure to cut the film completely, affecting the quality of the final product and the neatness of the winding. For example, when processing wide or ultra-thin film materials, the material itself has lower rigidity and is more sensitive to swaying, making the inaccurate edge-cutting problem caused by an excessively long suspended film section particularly prominent. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a composite membrane traction machine and its control method, solving the technical problem of inaccurate edge cutting operations caused by swaying due to excessively long suspended membrane length.

[0004] To solve the above-mentioned technical problems, the specific contents of the present invention are as follows: In a first aspect, the present invention provides a composite membrane traction machine, comprising a physical device and a control device that establishes a communication connection with the physical device; The physical device includes a traction wall plate, a traction guide roller assembly and a traction roller assembly fixed on the traction wall plate, and a traction trimming assembly installed on the upper part of the traction wall plate by a traction hoisting component. The traction guide roller assembly, the traction trimming assembly and the traction roller assembly are arranged along the film travel path to shorten the suspended film segment. The control device includes: The film state acquisition module is used to acquire raw data on the film edge position and lateral displacement through sensors arranged near the traction guide roller assembly and the traction trimming assembly. The oscillation analysis module is used to receive the raw data, perform digital signal processing, calculate the oscillation amplitude and frequency of the thin film, and generate an oscillation index that characterizes the degree of instability of the thin film. The edge-cutting control decision module is used to receive the swing index and generate control commands for adjusting the lateral position or cutting sequence of the traction edge-cutting component based on the comparison result of the swing index and the preset threshold. The execution and feedback module is used to receive the control commands, drive the gas tank assembly or servo motor in the physical device to perform actions, adjust the pressure of the traction roller assembly or the cutting operation of the flying knife assembly, monitor the edge quality of the film after execution, and send the feedback signal back to the film status acquisition module.

[0005] Furthermore, in the composite film traction machine of the present invention, the sensor in the film state acquisition module is a photoelectric encoder or a laser displacement sensor; the photoelectric encoder is installed at the bearing seat of the traction guide roller assembly, measures the rotation angle of the guide roller and generates a first analog signal; the laser displacement sensor scans the edge of the film at an incident angle of degrees and generates a second analog signal; the first analog signal or the second analog signal is amplified and filtered by a signal conditioning circuit, converted into a digital signal by an analog-to-digital converter, and after adding a timestamp, transmitted to the swing analysis module through a serial communication interface.

[0006] Furthermore, in the composite membrane traction machine of the present invention, the digital signal processing process in the swing analysis module includes: validating and performing CRC check on the digital signal received from the thin film state acquisition module; applying a low-pass filter to eliminate high-frequency noise to the verified digital signal; converting the time-domain signal into a frequency-domain signal through a fast Fourier transform to extract the swing frequency component; calculating the swing amplitude; comparing the swing amplitude with a threshold dynamically set based on the thin film material and production line speed; and outputting the swing index.

[0007] Furthermore, in the composite membrane traction machine of the present invention, the process of generating control commands in the edge-cutting control decision module adopts the proportional-integral-derivative control principle; based on the swing index received from the swing analysis module, the basic compensation amount is obtained by looking up a table, and dynamically adjusted in combination with the instability index output by the swing analysis module; the lateral displacement compensation amount of the traction edge-cutting component or the cutting timing phase advance amount of the flying knife component is calculated, and the compensation amount is converted into stepper motor pulse parameters to generate a pulse width modulation signal.

[0008] Furthermore, in the composite membrane traction machine of the present invention, the execution and feedback module drives the pressure regulating valve or servo motor of the air tank assembly to perform actions, and adopts a piecewise linear control strategy to adjust the clamping force of the traction roller assembly; after the action is performed, the cutting position of the flying knife assembly is detected by a photoelectric switch, and the actual displacement is fed back by an encoder to generate an execution deviation report; based on the execution deviation report, the edge image data and position deviation value of the film after cutting are collected, and after data compression, they are returned to the film status acquisition module through a circular buffer queue.

[0009] Furthermore, the physical device of the composite film traction machine of the present invention further includes a traction cross brace, a wall panel foot assembly, a traction floating roller assembly, a traction edge suction assembly, an edge material suction pipe assembly, and a guide roller mounting plate; the traction cross brace is laterally connected to the traction wall panels on both sides, the traction wall panels are fixed to the ground by the wall panel foot assembly, the traction floating roller assembly is arranged below the traction roller assembly, and the guide roller mounting plate adopts an open-cover structure to assemble self-aligning bearings.

[0010] Furthermore, in the composite membrane traction machine of the present invention, the modules in the control device are connected via industrial Ethernet protocol, PROFIBUS-DP fieldbus or RS-serial communication protocol; the data output by the film status acquisition module is transmitted to the swing analysis module through the communication protocol, and after the edge cutting control decision module generates instructions, it is sent to the execution and feedback module. The feedback data is returned to the film status acquisition module to form a closed loop logic, and the IEEE clock protocol is used to achieve microsecond-level time synchronization between modules.

[0011] Furthermore, in the composite membrane traction machine of the present invention, the control commands generated by the edge-cutting control decision module are subjected to dual redundancy verification and sent to the execution and feedback module via PROFIBUS-DP fieldbus; the control command package includes a serial number, execution timestamp, and expected action parameters, and the integrity of the command is verified by a hash algorithm.

[0012] Furthermore, in the composite film traction machine of the present invention, the flying knife assembly of the traction cutting component is a shaftless structure, which cooperates with the traction suction assembly; after the execution and feedback module drives the flying knife assembly to perform cutting, the feedback signal obtained from the flying knife assembly and the encoder is used to calibrate the sensor calibration parameters of the film state acquisition module.

[0013] Secondly, the present invention provides a control method for a composite membrane traction machine, applied to the composite membrane traction machine as described above, comprising: Step 1: Collect raw data on the film edge position and lateral displacement using sensors placed near the traction guide roller assembly and the traction trimming assembly; Step 2: Receive the raw data, perform digital signal processing on the raw data, calculate the oscillation amplitude and frequency of the thin film, and generate an oscillation index characterizing the degree of instability of the thin film; Step 3: Based on the comparison result between the swing index and the preset threshold, generate control commands to adjust the lateral position of the traction cutting component or the cutting sequence of the flying knife component; Step 4: Drive the air tank assembly or servo motor to execute the control commands, adjust the pressure of the traction roller assembly or the cutting action of the flying knife assembly, monitor the film edge quality after execution, and return the feedback signal to the acquisition process of the step to form a closed-loop control.

[0014] Beneficial effects of this invention; This invention effectively solves the technical problem of inaccurate swaying and edge-cutting operations caused by excessively long suspended film by optimizing the structure of the physical device and coordinating the closed-loop control of the control device. The physical device's traction guide roller assembly, traction edge-cutting assembly, and traction roller assembly are compactly arranged along the film's travel path to shorten the suspended film section, reducing the lateral swaying space of the film from a mechanical perspective. The control device's film state acquisition module acquires real-time raw data on the film's edge position and lateral displacement. The sway analysis module generates a sway index through digital signal processing. The edge-cutting control decision module generates control commands based on a comparison of the sway index with a preset threshold. The execution and feedback module drives the air tank assembly or servo motor to adjust the pressure of the traction pressure roller assembly or the cutting action of the fly knife assembly and provides feedback calibration, forming a data-driven closed loop. This allows the system to respond to changes in film state in real time, dynamically compensate for sway deviations, and keep the edge-cutting trajectory synchronized with the actual edge of the film, thereby significantly improving edge-cutting accuracy and winding neatness, enhancing product quality and production efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a composite membrane traction machine provided in an embodiment of the present invention.

[0017] Figure 2 This is a top view structural diagram of a composite membrane traction machine with guardrail components installed, provided as an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 1-Guide roller assembly, 2-Traction edge trimming assembly, 3-Traction roller assembly, 4-Traction pressure roller assembly, 5-Traction floating roller assembly, 6-Traction edge suction assembly, 7-Traction wall panel, 8-Traction cross brace, 9-Wall panel foot assembly, 10-Traction hoisting component, 11-Flying knife assembly, 12-Contact trolley assembly, 13-Gas tank assembly, 14-Pull-wire switch assembly, 15-Guardrail assembly, 16-Edge material suction pipe assembly, 17-Guide roller mounting plate, 18-First hexagon socket head cap screw, 19-Second hexagon socket head cap screw, 20-Third hexagon socket head cap screw. Detailed Implementation

[0019] To make the technical solution of the present invention clearer, the present invention will be clearly and completely described below with reference to specific embodiments and corresponding 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 skilled in the art without creative effort are within the scope of protection of the present invention. The present invention provided by various embodiments will be described in detail below with reference to the accompanying drawings. To better understand the purpose of the present invention, the present invention will be described in further detail below.

[0020] Please see Figure 1 In a first aspect, the present invention provides a composite membrane traction machine, comprising a physical device and a control device that establishes a communication connection with the physical device; The physical device includes a traction wall plate 7, a traction guide roller assembly 1 and a traction roller assembly 3 fixed on the traction wall plate 7, and a traction trimming assembly 2 installed on the upper part of the traction wall plate 7 via a traction hoisting component 10. The traction guide roller assembly 1, the traction trimming assembly 2 and the traction roller assembly 3 are arranged along the film travel path to shorten the suspended film segment. The control device includes: The film state acquisition module is used to acquire raw data on the film edge position and lateral displacement through sensors arranged near the traction guide roller assembly 1 and the traction trimming assembly 2. The oscillation analysis module is used to receive the raw data, perform digital signal processing, calculate the oscillation amplitude and frequency of the thin film, and generate an oscillation index that characterizes the degree of instability of the thin film. The edge-cutting control decision module is used to receive the swing index and generate control commands for adjusting the lateral position or cutting sequence of the traction edge-cutting component 2 based on the comparison result of the swing index and the preset threshold. The execution and feedback module is used to receive the control commands, drive the gas tank assembly 13 or servo motor in the physical device to perform actions, adjust the pressure of the traction roller assembly 4 or the cutting operation of the flying knife assembly 11, monitor the quality of the film edge after execution, and send the feedback signal back to the film status acquisition module.

[0021] The composite membrane traction machine provided by this invention includes a physical device and a control device that establishes a communication connection with the physical device. The control device, through the coordinated operation of multiple functional modules, achieves real-time monitoring and adjustment of the film's operating status to solve the problem of inaccurate edge cutting caused by the swaying of the suspended membrane. The data flow of the control device follows a closed-loop logic from acquisition to feedback, ensuring the continuity of information transmission between modules.

[0022] The thin film state acquisition module, as the starting point of the data stream, is responsible for acquiring raw data on the edge position and lateral displacement of the thin film. The module acquires data through sensors arranged near the traction guide roller assembly 1 and the traction trimming assembly 2. These sensors can be either photoelectric encoders or laser displacement sensors. The photoelectric encoder, mounted on the bearing housing of the traction guide roller assembly 1, measures the rotation angle of the guide roller and generates a first analog signal. The laser displacement sensor scans the thin film edge at a 45-degree incident angle and generates a second analog signal. The first or second analog signal is amplified and filtered by a signal conditioning circuit to eliminate environmental noise, and then converted into a digital signal by an analog-to-digital converter. After adding a timestamp, the digital signal is transmitted to the oscillation analysis module via a serial communication interface, providing high-precision input for subsequent analysis.

[0023] The oscillation analysis module receives digital signals from the thin film state acquisition module and performs in-depth signal processing to quantify the oscillation characteristics of the thin film. The processing includes validating the digital signals and performing CRC checks to ensure data integrity. After verification, a low-pass filter is applied to the digital signals to eliminate high-frequency noise. The filtered digital signals are then converted from the time domain to the frequency domain using a Fast Fourier Transform (FFT) to extract the oscillation frequency components and calculate the oscillation amplitude. The calculated oscillation amplitude is compared with a threshold dynamically set based on the thin film material and production line speed to generate an oscillation index characterizing the degree of thin film instability. The oscillation index is output as the analysis result to the edge trimming control decision module, forming a key conversion node in the data stream.

[0024] The edge-cutting control decision module generates an adaptive control strategy based on the oscillation index output by the oscillation analysis module. The module employs a proportional-integral-derivative control principle, obtaining the basic compensation amount through a lookup table based on the oscillation index, and dynamically adjusting it in conjunction with the instability index output by the oscillation analysis module. The calculation process involves the lateral displacement compensation of the traction edge-cutting component 2 or the cutting timing phase advance of the flying knife component 11. The compensation amount is converted into stepper motor pulse parameters and a pulse width modulation signal is generated. Control commands are sent to the execution and feedback module via a communication interface to ensure synchronization between the commands and the actual state of the thin film.

[0025] The execution and feedback module translates control commands into physical actions and achieves system closed-loop control. The module drives the pressure regulating valve or servo motor of the gas tank assembly 13 to perform actions, employing a piecewise linear control strategy to adjust the clamping force of the traction roller assembly 4. After the action is executed, the cutting position of the flying knife assembly 11 is detected by a photoelectric switch, and the actual displacement is fed back through an encoder to generate an execution deviation report. Based on the execution deviation report, the edge image data and position deviation value of the film after cutting are collected. The data is compressed and returned to the film status acquisition module through a circular buffer queue for calibrating sensor parameters. The feedback mechanism enables the system to have self-learning capabilities and continuously optimize control accuracy.

[0026] The various modules of the control device are connected via industrial Ethernet protocol, PROFIBUS-DP fieldbus, or RS-485 serial communication protocol. The data flow path strictly follows the closed-loop logic of acquisition, analysis, decision-making, execution, and feedback. The modules use the IEEE 1588 clock protocol to achieve microsecond-level time synchronization, ensuring data real-time performance. Overall, the technical solution, based on the structural optimization of the physical device and with the data-driven adjustment of the control device as its core, achieves high precision and stability in the thin film edge trimming process.

[0027] In a specific embodiment of the thin film state acquisition module of the present invention, the sensor adopts a photoelectric encoder or a laser displacement sensor; the photoelectric encoder is installed at the bearing seat of the guide roller assembly 1, measures the rotation angle of the guide roller and generates a first analog signal; the laser displacement sensor scans the edge of the thin film at a 45-degree incident angle and generates a second analog signal; the first analog signal or the second analog signal is amplified and filtered by a signal conditioning circuit to eliminate environmental noise, and then converted into a digital signal by an analog-to-digital converter; after adding a timestamp to the digital signal, it is transmitted to the swing analysis module through a serial communication interface to provide high-precision input data for subsequent analysis, ensuring the real-time performance and accuracy of data acquisition.

[0028] The digital signal processing of the swing analysis module of this invention includes: validating and performing CRC checks on the digital signal received from the thin film state acquisition module to ensure data integrity; applying a low-pass filter to eliminate high-frequency noise from the verified digital signal; converting the filtered digital signal from a time-domain signal to a frequency-domain signal using a fast Fourier transform; extracting the swing frequency component and calculating the swing amplitude; comparing the calculated swing amplitude with a threshold dynamically set based on the thin film material and production line speed; and outputting a swing index characterizing the degree of thin film instability. This process achieves quantitative analysis of the thin film swing characteristics, providing a basis for control decisions.

[0029] The specific method for generating control commands in the edge-cutting control decision module of this invention is as follows: The module adopts the proportional-integral-derivative control principle; based on the swing index received from the swing analysis module, the basic compensation amount is obtained by looking up a table, and dynamically adjusted in combination with the instability index output by the swing analysis module; the calculation process involves the lateral displacement compensation amount of the traction edge-cutting component 2 or the cutting timing phase advance amount of the flying knife component 11; the compensation amount is converted into stepper motor pulse parameters to generate a pulse width modulation signal; the control command is sent to the execution and feedback module through the communication interface to achieve precise control.

[0030] The module of this invention drives the pressure regulating valve or servo motor of the gas tank assembly 13 to perform actions, and adopts a piecewise linear control strategy to adjust the clamping force of the traction roller assembly 4. After the action is performed, the cutting position of the flying knife assembly 11 is detected by a photoelectric switch, and the actual displacement is fed back by an encoder to generate an execution deviation report. Based on the execution deviation report, the edge image data and position deviation value of the film after cutting are collected. After the data is compressed, it is returned to the film status acquisition module through a circular buffer queue for calibrating sensor parameters and forming closed-loop control.

[0031] The physical device of the present invention also includes a traction cross brace 8, a wall panel foot assembly 9, a traction floating roller assembly 5, a traction edge suction assembly 6, an edge material suction pipe assembly 16, and a guide roller mounting plate 17; the traction cross brace 8 connects the traction wall panels 7 on both sides laterally to enhance structural rigidity; the traction wall panels 7 are fixed to the ground by the wall panel foot assembly 9 to ensure stability; the traction floating roller assembly 5 is arranged below the traction roller assembly 3 to reduce the height of the machine platform; the guide roller mounting plate 17 adopts an open-cover structure to assemble self-aligning bearings for easy maintenance.

[0032] The modules of this invention are connected via industrial Ethernet protocol, PROFIBUS-DP fieldbus or RS-485 serial communication protocol; the data output by the thin film status acquisition module is transmitted to the swing analysis module through the communication protocol, and after the edge cutting control decision module generates instructions, it is sent to the execution and feedback module; the feedback data is returned to the thin film status acquisition module to form a closed loop logic; the IEEE1588 clock protocol is used to achieve microsecond-level time synchronization between modules to ensure data real-time performance and system coordination.

[0033] The control commands generated by the edge-cutting control decision module of this invention undergo dual redundancy verification and are sent to the execution and feedback module via the PROFIBUS-DP fieldbus. The control command package includes a sequence number, execution timestamp, and expected action parameters. A hash algorithm is used to verify the integrity of the commands, prevent transmission errors, and improve control reliability.

[0034] The present invention features a shaftless structure and feedback calibration for the flying knife assembly 11. The flying knife assembly 11 of the traction cutting assembly 2 is a shaftless structure, which works in conjunction with the traction suction assembly 6 to reduce space occupation. After the execution and feedback module drives the flying knife assembly 11 to perform cutting, the feedback signal obtained from the flying knife assembly 11 and the encoder is used to calibrate the sensor calibration parameters of the thin film state acquisition module, thereby realizing system self-optimization.

[0035] In a second aspect, the present invention provides a control method for a composite membrane traction machine, applied to the composite membrane traction machine as described above, comprising: Step 1: Collect raw data on the film edge position and lateral displacement using sensors arranged near the traction guide roller assembly 1 and the traction trimming assembly 2; Step 2: Receive the raw data, perform digital signal processing on the raw data, calculate the oscillation amplitude and frequency of the thin film, and generate an oscillation index characterizing the degree of instability of the thin film; Step 3: Based on the comparison result between the swing index and the preset threshold, generate control commands to adjust the lateral position of the traction cutting component 2 or the cutting sequence of the flying knife component 11; Step 4: Drive the air tank assembly 13 or the servo motor to execute the control command, adjust the pressure of the traction roller assembly 4 or the cutting action of the flying knife assembly 11, monitor the film edge quality after execution, and return the feedback signal to the acquisition process in Step 1 to form a closed-loop control. This invention solves the technical problem of inaccurate swaying and edge-cutting operations caused by excessively long suspended membranes through the synergistic effect of structural optimization of the physical device and closed-loop control of the control device. In the physical device, the traction guide roller assembly 1, the traction edge-cutting assembly 2, and the traction roller assembly 3 are compactly arranged along the film's travel path. By shortening the length of the suspended membrane segment, the lateral sway space of the film is reduced mechanically, thus mitigating the impact of airflow and equipment vibration on film stability. The control device acquires raw data on the film edge position and lateral displacement in real time through the film status acquisition module. The sway analysis module performs digital signal processing on the raw data and generates a sway index. The edge-cutting control decision module generates control commands based on the comparison between the sway index and a preset threshold. The execution and feedback module drives the air tank assembly 13 or the servo motor to adjust the pressure of the traction pressure roller assembly 4 or the cutting action of the flying knife assembly 11, and monitors the quality of the film edge after execution. The feedback signal is returned to the film status acquisition module, forming a data-driven closed loop.

[0036] The data flow of the control device follows a coherent logic of acquisition, analysis, decision-making, execution, and feedback. The film state acquisition module obtains the film's operating status through sensors, the oscillation analysis module quantifies the oscillation characteristics, the edge-cutting control decision module adaptively generates compensation commands, and the execution and feedback module implements physical adjustments and provides feedback calibration. The modular design enables the system to respond to changes in film state in real time and dynamically compensate for oscillation deviations, thereby keeping the edge-cutting trajectory synchronized with the actual edge of the film, improving edge-cutting accuracy and winding neatness. The structural optimization of the physical device provides a stable foundation for control, while the intelligent adjustment of the control device compensates for the limitations of mechanical fixation. The combination of the two produces non-obvious technical effects, effectively solving the industry pain point of inaccurate edge cutting in high-speed production environments.

[0037] This invention addresses the technical problem of excessively long suspended film sections leading to swaying and inaccurate edge cutting in continuous film production lines. A solution is achieved through a combination of structural optimization of the physical device and intelligent adjustment of the control device. In the physical device, the traction wall plate 7 is fixed to the ground by wall plate foot components 9, and the traction cross brace 8 connects the two traction wall plates 7 laterally to enhance rigidity. The traction guide roller assembly 1, the traction edge cutting assembly 2, and the traction roller assembly 3 are compactly arranged along the film's travel path. The traction guide roller assembly 1 and the traction roller assembly 3 are fixed to the inside of the traction wall plate 7, and the traction edge cutting assembly 2 is installed on the upper part of the traction wall plate 7 via the traction lifting component 10. This arrangement effectively shortens the length of the suspended film section and reduces the space for lateral film swaying. The traction floating roller assembly 5 is arranged below the traction roller assembly 3 to reduce the machine height. The guide roller mounting plate 17 adopts an open-cover structure to assemble self-aligning bearings for easy maintenance. The traction edge suction assembly 6 works with the flying knife assembly 11 to process edge material, and the edge material suction pipe assembly 16 collects waste material. The overall structure provides a stable foundation for the control device.

[0038] The control device acquires the film's operating status in real time through a film status acquisition module. This module collects data using photoelectric encoders or laser displacement sensors positioned near the traction guide roller assembly 1 and the traction trimming assembly 2. The photoelectric encoder, mounted on the bearing seat of the traction guide roller assembly 1, measures the rotation angle of the guide roller to generate a first analog signal. The laser displacement sensor scans the film edge at a 45-degree incident angle to generate a second analog signal. The first or second analog signal is amplified and filtered by a signal conditioning circuit, converted into a digital signal by an analog-to-digital converter, and timestamped before being transmitted to the oscillation analysis module via a serial communication interface. The oscillation analysis module verifies the validity of the received digital signal and performs CRC checks. The verified signal is then filtered using a low-pass filter to eliminate high-frequency noise. The filtered signal is converted from the time domain to the frequency domain using a fast Fourier transform, extracting the oscillation frequency components and calculating the oscillation amplitude. The calculation result is compared with a threshold dynamically set based on the film material and production line speed to generate an oscillation index. The edge-cutting control decision module adopts the proportional-integral-derivative control principle. Based on the oscillation index, it obtains the basic compensation amount through a lookup table method. Combined with dynamic adjustment of the instability index, it calculates the lateral displacement compensation amount of the traction edge-cutting component 2 or the cutting timing phase advance amount of the flying knife component 11. The compensation amount is converted into stepper motor pulse parameters to generate a pulse width modulation signal. The execution and feedback module drives the pressure regulating valve or servo motor of the air tank component 13, and adjusts the clamping force of the traction pressure roller component 4 using a piecewise linear control strategy. After the action is executed, the cutting position of the flying knife component 11 is detected by a photoelectric switch, and the encoder feeds back the actual displacement to generate an execution deviation report. Based on the report, it collects the film edge image data and position deviation value after edge cutting. After data compression, it returns to the film status acquisition module through a circular buffer queue to achieve sensor calibration parameter calibration.

[0039] The various modules of the control device are connected via industrial Ethernet protocol, PROFIBUS-DP fieldbus, or RS-485 serial communication protocol. Data output from the film status acquisition module is transmitted to the swing analysis module via the communication protocol. After the edge trimming control decision module generates instructions, it sends them to the execution and feedback module. Feedback data is returned to form a closed-loop logic. The modules use the IEEE 1588 clock protocol to achieve microsecond-level time synchronization. During instruction transmission, double redundancy verification is performed. The control instruction packet includes a sequence number, execution timestamp, and expected action parameters, and a hash algorithm is used to verify its integrity. The physical device and the control device work together to address the characteristics of wide or ultra-thin film materials, such as low stiffness and sensitivity to swing. Through real-time data acquisition and adaptive adjustment, the device dynamically compensates for film swing deviations, ensuring that the edge trimming trajectory is consistent with the actual edge of the film. This improves edge trimming accuracy and winding neatness, solving technical pain points in high-speed production environments.

Claims

1. A composite membrane traction machine and its control method, characterized in that, Includes a physical device and a control device that establishes a communication connection with the physical device; The physical device includes a traction wall plate (7), a traction guide roller assembly (1) and a traction roller assembly (3) fixed on the traction wall plate (7), and a traction trimming assembly (2) installed on the upper part of the traction wall plate (7) by a traction hoisting component (10). The traction guide roller assembly (1), the traction trimming assembly (2) and the traction roller assembly (3) are arranged along the film travel path to shorten the suspended film segment. The control device includes: The film state acquisition module is used to acquire raw data on the film edge position and lateral displacement by means of sensors arranged near the traction guide roller assembly (1) and the traction trimming assembly (2); The oscillation analysis module is used to receive the raw data, perform digital signal processing, calculate the oscillation amplitude and frequency of the thin film, and generate an oscillation index that characterizes the degree of instability of the thin film. The edge-cutting control decision module is used to receive the swing index and generate control commands for adjusting the lateral position or cutting sequence of the traction edge-cutting component (2) based on the comparison result of the swing index and the preset threshold. The execution and feedback module is used to receive the control command, drive the gas tank assembly (13) or servo motor in the physical device to perform actions, adjust the pressure of the traction roller assembly (4) or the cutting operation of the flying knife assembly (11), monitor the edge quality of the film after execution, and send the feedback signal back to the film status acquisition module.

2. The composite membrane traction machine according to claim 1, characterized in that, In the thin film state acquisition module, the sensor is a photoelectric encoder or a laser displacement sensor; the photoelectric encoder is installed at the bearing seat of the guide roller assembly (1), measures the rotation angle of the guide roller and generates a first analog signal; the laser displacement sensor scans the edge of the thin film at a 45-degree incident angle and generates a second analog signal; the first analog signal or the second analog signal is amplified and filtered by the signal conditioning circuit, converted into a digital signal by the analog-to-digital converter, and after adding a timestamp, transmitted to the swing analysis module through the serial communication interface.

3. The composite membrane traction machine according to claim 2, characterized in that, In the swing analysis module, the digital signal processing process includes: validating and performing CRC check on the digital signal received from the thin film state acquisition module; applying a low-pass filter to the verified digital signal to eliminate high-frequency noise; converting the filtered digital signal into a frequency domain signal through a fast Fourier transform; extracting the swing frequency component; calculating the swing amplitude; comparing the swing amplitude with a threshold dynamically set based on the thin film material and production line speed; and outputting the swing index.

4. The composite membrane traction machine according to claim 3, characterized in that, In the edge-cutting control decision module, the process of generating control commands adopts the proportional-integral-derivative control principle; based on the swing index received from the swing analysis module, the basic compensation amount is obtained by looking up a table, and dynamically adjusted in combination with the instability index output by the swing analysis module, the lateral displacement compensation amount of the traction edge-cutting component (2) or the cutting timing phase advance amount of the flying knife component (11) is calculated, and the compensation amount is converted into stepper motor pulse parameters to generate a pulse width modulation signal.

5. The composite membrane traction machine according to claim 4, characterized in that, In the execution and feedback module, the pressure regulating valve or servo motor of the drive gas tank assembly (13) performs the action, and the clamping force of the traction roller assembly (4) is adjusted by a piecewise linear control strategy. After the action is performed, the cutting position of the flying knife assembly (11) is detected by a photoelectric switch, and the actual displacement is fed back by an encoder to generate an execution deviation report. Based on the execution deviation report, the edge image data and position deviation value of the film after cutting are collected, and after data compression, they are returned to the film status acquisition module through a ring buffer queue.

6. The composite membrane traction machine according to claim 5, characterized in that, The physical device also includes a traction cross brace (8), a wall panel foot assembly (9), a traction floating roller assembly (5), a traction edge suction assembly (6), an edge material suction pipe assembly (16), and a guide roller mounting plate (17); the traction cross brace (8) is horizontally connected to the traction wall panels (7) on both sides, the traction wall panels (7) are fixed to the ground by the wall panel foot assembly (9), the traction floating roller assembly (5) is arranged below the traction roller assembly (3), and the guide roller mounting plate (17) adopts an open-cover structure to assemble self-aligning bearings.

7. The composite membrane traction machine according to claim 6, characterized in that, The modules in the control device are connected via industrial Ethernet protocol, PROFIBUS-DP fieldbus or RS-485 serial communication protocol; the data output by the thin film status acquisition module is transmitted to the swing analysis module through the communication protocol, and after the edge cutting control decision module generates the instruction, it is sent to the execution and feedback module. The feedback data is returned to the thin film status acquisition module to form a closed loop logic. The IEEE1588 clock protocol is used to realize microsecond-level time synchronization between modules.

8. The composite membrane traction machine according to claim 7, characterized in that, The control commands generated by the edge-cutting control decision module undergo dual redundancy verification and are sent to the execution and feedback module via the PROFIBUS-DP fieldbus. The control command package includes a serial number, execution timestamp, and expected action parameters, and the integrity of the command is verified using a hash algorithm.

9. The composite membrane traction machine according to claim 8, characterized in that, The flying knife assembly (11) of the traction cutting assembly (2) is a shaftless structure and cooperates with the traction suction assembly (6); after the execution and feedback module drives the flying knife assembly (11) to perform cutting, the feedback signal obtained from the flying knife assembly (11) and the encoder is used to calibrate the sensor calibration parameters of the thin film state acquisition module.

10. A control method for a composite membrane traction machine, applied to the composite membrane traction machine as described in any one of claims 1 to 9, characterized in that, include: Step 1: Acquire raw data on the film edge position and lateral displacement using sensors arranged near the traction guide roller assembly (1) and the traction trimming assembly (2); Step 2: Receive the raw data, perform digital signal processing on the raw data, calculate the oscillation amplitude and frequency of the thin film, and generate an oscillation index characterizing the degree of instability of the thin film; Step 3: Based on the comparison result between the swing index and the preset threshold, generate control commands to adjust the lateral position of the traction cutting component (2) or the cutting sequence of the flying knife component (11); Step 4: Drive the air tank assembly (13) or servo motor to execute the control command, adjust the pressure of the traction roller assembly (4) or the cutting action of the flying knife assembly (11), monitor the quality of the film edge after execution, and return the feedback signal to Step 1.

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