A cooling setting control system for a PET packing belt forming process

Abstract

The present application relates to the technical field of plastic forming processing, and particularly relates to a cooling and shaping control system for a PET packing belt forming process, comprising a verification module, a regulation and control module, a feedback module and a determination module. The verification module completes layer-by-layer determination of hardware communication, effective collection, cooling water working condition and extrusion temperature before cooling; the regulation and control module realizes three-stage partition cooling, and performs graded flow regulation according to the temperature difference between the core and the edge of the belt body; the feedback module completes closed-loop verification, traction speed adaptation and abnormal graded disposal; and the determination module realizes standard determination according to temperature, temperature difference and time length. The system can solve the problems of warping, uneven thickness and residual internal stress caused by unbalanced traditional cooling rate, improve the cooling control precision and the forming quality of the packing belt, ensure continuous and stable production, and adapt to the needs of industrial continuous production.

Description

Technical Field

[0001] This invention relates to the field of plastic molding and processing technology, and more specifically, to a cooling and shaping control system for the molding process of PET strapping. Background Technology

[0002] In the current PET strapping production process, the cooling and setting stage is a crucial step in ensuring the dimensional accuracy and mechanical properties of the strapping. Currently, traditional cooling and setting control often employs a crude control model with manually preset fixed cooling water flow rates and cooling durations. This lacks a systematic pre-verification mechanism and a step-by-step assessment process for system hardware communication, data acquisition module effectiveness, cooling water conditions, and initial extrusion temperature. Consequently, cooling control is prone to failure due to hardware malfunctions, abnormal sampling, or substandard water sources.

[0003] The cooling process lacks precise three-stage zoned control of preheating cooling, main cooling, and final shaping cooling. It cannot adjust the flow rate in stages based on the temperature difference between the core and the edges of the strapping, easily leading to an imbalance in cooling rates between the core and edges. This results in problems such as strapping warping, uneven thickness, and residual internal stress. Furthermore, the existing control method lacks full-process closed-loop feedback, traction speed linkage adaptation, and abnormal graded handling logic. It also lacks adjustment failure judgment and redundant protection mechanisms, and cannot correct cooling deviations in real time. This results in poor stability of strapping forming quality, low yield, and difficulty in meeting the requirements of high-precision, continuous industrial production. Summary of the Invention

[0004] In view of this, the present invention addresses the shortcomings of the prior art by proposing a cooling and shaping control system for the PET strapping forming process, aiming to solve at least one of the problems mentioned in the background art.

[0005] This invention provides a cooling and shaping control system for the PET strapping molding process, including: a verification module, configured to complete system hardware communication self-test, data acquisition module validity verification, cooling water precondition check and extrusion initial temperature prediction before the cooling process is started, and issue cooling start permission after determining that all preconditions are qualified layer by layer. The control module is configured to continuously control the target packing tape in three stages: preheating cooling, main cooling, and final shaping cooling after obtaining the start permission. It collects the temperature of the core and both sides of the tape in real time, determines the temperature difference exceeding the standard and the level, matches the corresponding amplitude of the zoned cooling water flow direction adjustment, and simultaneously completes the inter-segment data transfer, temperature threshold determination, regulating valve limit and flow interlock judgment. The feedback module is configured to scan the operating parameters of the PLC in a fixed cycle throughout the three-stage cooling operation, and sequentially complete the adjustment effect review, flow interlock verification, traction speed adaptation, abnormal classification and handling, and adjustment failure count judgment, and verify the execution status in real time. The judgment module is configured to collect the temperature difference of the outlet belt and the overall temperature after the three-stage cooling is completed, and combine the settling time to complete the standard judgment. The qualified belt will be output as a release command, and the unqualified belt will be continuously corrected.

[0006] In some embodiments, the verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check, and extrusion initial temperature prediction before the cooling process starts. When issuing a cooling start permit after verifying that all preconditions are met, the following steps are included: First, perform a system hardware communication self-test to check the communication status of the PLC core module and external devices. Only if there are no communication faults, disconnections, or short circuits can you proceed to the next step. Then, the temperature acquisition probe and water pressure acquisition probe are sampled continuously for a preset number of times. When the value of the preset number of samples fluctuates within a preset small deviation range, the sampling is deemed valid. If the value fluctuation of a preset number of samples exceeds the preset range or the value of a single sample exceeds the preset small deviation range, the sampling is determined to be a failure, the abnormal probe data is blocked and the backup probe data is enabled. If there is no backup probe, a fault warning is output and the current cooling parameters are kept unchanged.

[0007] In some embodiments, the verification module is configured to perform system hardware communication self-test, acquisition module validity verification, cooling water precondition check and extrusion initial temperature prediction before the cooling process starts, and issue a cooling start permit after determining that all preconditions are qualified layer by layer. This also includes: The cooling water inlet temperature and inlet water pressure are collected in real time. When the cooling water inlet temperature is lower than the preset upper limit temperature of cooling water and the cooling water inlet water pressure is within the normal working water pressure range, the cooling water source is deemed to be in good working condition. When the cooling water inlet temperature is greater than or equal to the preset upper limit temperature of cooling water or the cooling water inlet pressure is lower than the normal operating water pressure range, an abnormal water source warning will be output and the minimum basic flow rate of cooling water will be maintained. When the cooling water inlet pressure is higher than the normal operating water pressure range, the maximum opening of the regulating valve is limited and water circuit pressure regulation is performed. After completing the pre-cooling water condition check, the initial overall temperature of the PET strapping extrusion die outlet is collected to determine whether the initial overall temperature of the PET strapping extrusion die outlet meets the cooling start-up benchmark requirements. When the initial overall temperature at the outlet of the PET strapping extrusion die reaches the cooling start benchmark requirement, a cooling start permit is issued. Otherwise, maintain basic cooling standby mode.

[0008] In some embodiments, the control module is configured to, upon obtaining a start-up permit, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling; collect real-time temperatures of the core and both edges of the tape; determine the temperature difference exceeding the standard and its level; match the corresponding amplitude of zoned cooling water flow directional adjustment; and simultaneously complete inter-segment data transfer, temperature threshold determination, control valve limiting, and flow interlock determination, including: Only when the temperature difference between the two sides of the belt and the core meets the standard for a duration that meets the preset cumulative stabilization time is it determined that the preheating and cooling section is completed and smoothly switched to the main cooling section. If the temperature difference between the two sides of the belt and the core does not meet the standard but the belt has already moved to the end of the section, the final flow parameters of this section are locked and the temperature difference and adjustment status data are synchronously transmitted to the main cooling section to perform subsequent compensation and adjustment.

[0009] In some embodiments, the control module is configured to, upon obtaining a start-up permit, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling; collect real-time temperatures of the core and both edges of the tape; determine the temperature difference exceeding the standard and its level; match the corresponding amplitude of zoned cooling water flow directional adjustment; and simultaneously complete inter-segment data transfer, temperature threshold determination, regulating valve limiting, and flow interlock determination. The module also further includes: The main cooling section first performs the inter-section data transfer judgment. Specifically, when the temperature difference of the previous section meets the standard, the flow rates of the three cooling water paths of the core, left edge, and right edge are kept consistent and constant. Only the temperature and temperature difference status are monitored in real time, and no active flow adjustment is performed to maintain uniform cooling of the belt. When the temperature difference in the previous section does not meet the standard, the PLC inherits the temperature difference data and adjustment direction that has not been eliminated in the previous section, and continues to make compensatory fine adjustments to the cooling water flow rate on the corresponding side edge along the original adjustment direction. When the core temperature is higher than the main cooling and curing reference temperature, the core cooling water flow rate is increased in stages. When the core temperature is lower than the reference temperature, the core cooling water flow rate is reduced in stages. When the core temperature drops below the minimum safe cooling temperature, the flow rate is immediately locked to prevent further flow reduction. When a slight warping of the belt to one side is detected, the reverse cooling water flow is finely adjusted at the edge of the warped side until the warping signal disappears and the temperature difference returns to the standard range. The opening degree of the single-sided edge cooling water regulating valve is limited between the preset maximum safe opening degree and the minimum safe opening degree; The core flow rate adjustment range is less than or equal to a preset number of times the adjustment range of both sides, and the temperature difference and temperature status are re-evaluated in each scanning cycle.

[0010] In some embodiments, the control module is configured to, upon obtaining a start-up permit, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling; collect real-time temperatures of the core and both edges of the tape; determine the temperature difference exceeding the standard and its level; match the corresponding amplitude of zoned cooling water flow directional adjustment; and simultaneously complete inter-segment data transfer, temperature threshold determination, regulating valve limiting, and flow interlock determination. The module also further includes: When the core temperature of the main cooling section and the temperature difference between the two sides are all within the standard without fluctuation, the cooling water flow rate will be smoothly reduced to the basic constant flow rate. When the temperature in the main cooling section exceeds the preset temperature difference threshold, the flow rate is corrected according to the preset amplitude. If the overall temperature at the belt outlet is greater than the preset temperature, the final cooling time will be extended. When the temperature difference between the two sides of the outlet and the core exceeds the preset temperature difference threshold again, a small adjustment of the cooling water flow rate is performed on the corresponding side edge, and the adjustment range is less than or equal to the preset minimum adjustment range. Only when the strip body does not trigger a deformation warning signal throughout the entire process, and the strip body outlet temperature, the temperature difference between the two sides and the core remains within the corresponding preset threshold range for a preset number of consecutive scanning cycles, will the strip body enter the determination module for determination.

[0011] In some embodiments, the feedback module is configured such that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. Real-time verification of the execution status includes: The actual traction speed is collected and compared with the reference traction speed in real time at a fixed period. When the actual traction speed is higher than the reference speed, it is determined that the cooling time of the belt is shortened and the cooling water flow rate of the cooling section is increased. When the actual traction speed is lower than the reference speed, it is determined that the belt cooling time is extended and the cooling water flow rate of the cooling section is reduced.

[0012] In some embodiments, the feedback module is configured such that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. When verifying the execution status in real time, it also includes: Anomalies are scanned for all operating conditions at fixed intervals, and anomalies are classified into three levels: Level 1, Level 2, and Level 3. Level 1 anomalies are single probe failures or small deviations in single-loop flow. Only an anomaly warning is output and the original regulation logic is maintained to operate normally. Level 2 anomalies are caused by dual probe failure or regulating valve jamming. The corresponding redundant module is activated to maintain basic cooling operation and suspend the graded regulation logic. Level 3 anomalies are caused by multiple temperature differences continuously exceeding the standard, automatic adjustment being completely ineffective, or cooling water supply interruption. In such cases, an independent interlock shutdown of the cooling circuit is immediately triggered, the cooling water regulating valve is closed, and only the drainage circuit is slightly opened.

[0013] In some embodiments, the feedback module is configured such that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. When verifying the execution status in real time, it also includes: The effective number of adjustments at the same location and the same temperature difference exceeding the standard is continuously counted. When the temperature difference still fails to meet the standard after a preset number of adjustments and there is no trend of improvement, it is determined that the deviation cannot be corrected by automatic graded adjustment. The automatic graded adjustment mode is immediately exited, a cooling deviation exceeding the standard warning is output, all gradient flow adjustment is stopped, and only constant basic flow operation is maintained.

[0014] In some embodiments, the determination module is configured to, after the three-stage cooling is completed, collect the temperature difference of the outlet belt and the overall temperature, and combine this with the setting time to complete the compliance determination. For qualified belts, a release command is output; for unqualified belts, continuous correction is performed, including: When the overall temperature of the belt outlet is within the allowable deviation range of room temperature, the temperature difference between the two edges and the core is stable and meets the standard for a preset number of scanning cycles, there are no deformation warning signals, and the final cooling time meets the preset modeling time, it is judged to be qualified and a release command is output. If any one of the conditions is not met, the final monitoring and micro-correction will continue.

[0015] Compared with existing technologies, the advantages of this invention are as follows: This application achieves layer-by-layer verification of preconditions through a dedicated verification module, proactively avoiding problems such as hardware communication failures, sampling failures, and substandard cooling water conditions, thus eliminating the risk of cooling runaway from the source and significantly improving system stability and anti-interference capabilities. The three-stage control module enables precise flow regulation in zones, dynamically balancing the cooling rates of the core and both edges of the strap, effectively solving problems such as warping, uneven thickness, and residual internal stress caused by traditional cooling imbalances, and significantly improving the dimensional accuracy and mechanical properties of the strapping. The feedback module is equipped with a closed-loop verification and anomaly classification handling logic, which can adapt to traction speed in real time, correct adjustment deviations, and handle various faults, avoiding ineffective cyclic adjustments and ensuring production continuity. The judgment module performs standardized compliance judgment, accurately screening qualified products without manual intervention, reducing defective output, improving production yield, and the entire system is suitable for continuous industrial production, balancing control precision and operational efficiency, making it highly practical.

[0016] The above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0017] Other features and aspects of the present invention will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a functional block diagram of the cooling and shaping control system for the PET strapping forming process provided in an embodiment of the present invention. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] See Figure 1 As shown, the embodiments of this application include: The verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check and extrusion initial temperature prediction before the cooling process starts. After determining that all preconditions are qualified, the cooling start permit is issued. The control module is configured to continuously control the target packing tape in three stages: preheating cooling, main cooling, and final shaping cooling after obtaining the start permission. It collects the temperature of the core and both sides of the tape in real time, determines the temperature difference exceeding the standard and the level, matches the corresponding amplitude of the zoned cooling water flow direction adjustment, and simultaneously completes the inter-segment data transfer, temperature threshold determination, regulating valve limit and flow interlock judgment. The feedback module is configured to scan the operating parameters of the PLC in a fixed cycle throughout the three-stage cooling operation, and sequentially complete the adjustment effect review, flow interlock verification, traction speed adaptation, abnormal classification and handling, and adjustment failure count judgment, and verify the execution status in real time. The judgment module is configured to collect the temperature difference of the outlet belt and the overall temperature after the three-stage cooling is completed, and combine the settling time to complete the standard judgment. The qualified belt will be output as a release command, and the unqualified belt will be continuously corrected.

[0022] It should be understood that the verification module's hardware includes a PLC communication detection unit, multi-channel temperature acquisition probes, a water pressure sensor, and a die head temperature detector, responsible for four-layer verification of hardware, acquisition, water source, and extrusion temperature; the control module's hardware includes a three-section independent cooling water tank, three independent cooling water regulating valves for the core and double-sided edges, and a belt position sensor, realizing segmented control of preheating, main cooling, and final shaping, matching the flow rate adjustment range through temperature difference levels; the feedback module's hardware includes a traction speed sensor, a working condition scanning unit, and an anomaly monitoring unit, cyclically scanning the working condition at a fixed short cycle (100ms); the judgment module's hardware includes an outlet parameter acquisition unit and an instruction output unit, making a comprehensive judgment based on the shaping time. The entire system operates without manual intervention, with all modules uniformly scheduled by the PLC, ensuring process continuity.

[0023] Example Operation: After the PET strapping extrusion production line is started, the system first activates the verification module to complete four layers of pre-checks. Once all conditions are met, a start command is issued. The control module then initiates the three-stage cooling process, collecting the strapping temperature difference in real time and adjusting the zoned flow rate. The feedback module scans the working conditions synchronously throughout the process, adapts to the traction speed, and handles minor anomalies. After cooling, the judgment module checks the outlet parameters. If they are qualified, the process is pushed to the traction and winding process; otherwise, it is continuously fine-tuned and corrected. This technical solution achieves modular and systematic control of the cooling and shaping process, completely abandoning the traditional manual and extensive control mode. It avoids the risk of cooling start-up from the source, achieving precise and automated control of the cooling process. There is no human intervention error throughout the process, which greatly improves the stability of system operation. At the same time, it effectively solves the core problem of unbalanced cooling rate in traditional systems, ensuring uniform PET strapping forming quality. It is suitable for continuous high-speed industrial production, has strong system adaptability, an extremely low failure rate, and significantly reduces subsequent maintenance costs.

[0024] In some specific embodiments, the verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check, and extrusion initial temperature prediction before the cooling process starts. When issuing a cooling start permit after verifying that all preconditions are met, the following steps are included: First, perform a system hardware communication self-test to check the communication status of the PLC core module and external devices. Only if there are no communication faults, disconnections, or short circuits can you proceed to the next step. Then, the temperature acquisition probe and water pressure acquisition probe are sampled continuously for a preset number of times. When the value of the preset number of samples fluctuates within a preset small deviation range, the sampling is deemed valid. If the value fluctuation of a preset number of samples exceeds the preset range or the value of a single sample exceeds the preset small deviation range, the sampling is determined to be a failure, the abnormal probe data is blocked and the backup probe data is enabled. If there is no backup probe, a fault warning is output and the current cooling parameters are kept unchanged.

[0025] It should be understood that the system hardware communication self-test specifically refers to the PLC's comprehensive testing of its own CPU module, communication module, external probe cables, and actuator connection lines to identify and troubleshoot faults such as broken wires, short circuits, and signal loss. The validity verification of the data acquisition module sets a quantization threshold: three consecutive samples with a value fluctuation range ≤ ±1℃ are considered valid; fluctuations > ±1℃ or a single sample exceeding the normal temperature range (0-300℃) are considered invalid. The principle of this design is: hardware communication is the foundation of system operation, and acquired data is the core basis for cooling control. First, ensure the hardware is normal, then ensure the data is valid, preventing cooling control failures caused by incorrect data sources from the source and avoiding ineffective adjustments.

[0026] Example Operation: After the system is powered on, the PLC first checks its own communication and external lines. After confirming there are no open circuits or short circuits, it continuously samples three times from three temperature probes. If the value of one probe fluctuates by 2°C, exceeding the preset deviation, the system automatically blocks the data from that probe, activates the backup probe, and simultaneously outputs a probe anomaly warning, maintaining the current basic cooling parameters unchanged. This technical solution can proactively identify hidden faults in the hardware and data acquisition process, avoiding incorrect cooling flow adjustments due to data distortion, and preventing localized over- or under-cooling of PET strapping. It effectively improves the reliability and accuracy of system operation, reduces production defects caused by data acquisition failures, lowers production losses, and provides clear fault warnings, facilitating quick problem location by operators, shortening equipment maintenance time, and ensuring production continuity.

[0027] In some specific embodiments, the verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check, and extrusion initial temperature prediction before the cooling process starts. When issuing a cooling start permit after verifying that all preconditions are met, the module also includes: The cooling water inlet temperature and inlet water pressure are collected in real time. When the cooling water inlet temperature is lower than the preset upper limit temperature of cooling water and the cooling water inlet water pressure is within the normal working water pressure range, the cooling water source is deemed to be in good working condition. When the cooling water inlet temperature is greater than or equal to the preset upper limit temperature of cooling water or the cooling water inlet pressure is lower than the normal operating water pressure range, an abnormal water source warning will be output and the minimum basic flow rate of cooling water will be maintained. When the cooling water inlet pressure is higher than the normal operating water pressure range, the maximum opening of the regulating valve is limited and water circuit pressure regulation is performed. After completing the pre-cooling water condition check, the initial overall temperature of the PET strapping extrusion die outlet is collected to determine whether the initial overall temperature of the PET strapping extrusion die outlet meets the cooling start-up benchmark requirements. When the initial overall temperature at the outlet of the PET strapping extrusion die reaches the cooling start benchmark requirement, a cooling start permit is issued. Otherwise, maintain basic cooling standby mode.

[0028] It should be understood that the cooling water pre-condition check sets the upper limit threshold for the inlet water temperature at 30℃, and the normal operating water pressure range is 0.2-0.4MPa. If the water pressure exceeds this range, the operating condition is considered abnormal. The initial extrusion temperature prediction sets the cooling start reference temperature at 230℃, and a die outlet strip initial temperature ≥230℃ is considered compliant. The cooling water condition check relies on inlet temperature and water pressure sensors, while the extrusion temperature is collected by a die outlet temperature probe. The PLC compares the collected values ​​with the thresholds in real time and executes the corresponding logic. The principle is that if the cooling water temperature is too high or the water pressure is insufficient, effective cooling cannot be achieved; if the extrusion temperature is too low, the strip will not be fully melted, and there is no need for enhanced cooling. Only when both conditions are met is cooling control meaningful, ensuring the rationality of the cooling process initiation.

[0029] Example Operation: After the data acquisition module passes verification, the system detects that the cooling water inlet temperature is 25℃ and the water pressure is 0.3MPa, both within the acceptable range. Subsequently, the initial temperature of the strip at the die outlet is detected to be 240℃, reaching the start-up benchmark, and the PLC issues a cooling start-up permit. If the inlet water temperature is 32℃, exceeding the upper limit, the system outputs a water source abnormality warning, maintains the minimum basic flow rate, and does not initiate segmented control. This technical solution can accurately control the core prerequisites for cooling start-up, avoiding cooling and shaping failures caused by unqualified cooling media or substandard extrusion temperatures, preventing problems such as strip softening and deformation, and uneven cooling, significantly improving the start-up compliance rate of the cooling process, reducing ineffective production steps, reducing energy consumption, and ensuring the effectiveness of subsequent cooling control, laying the foundation for precise cooling.

[0030] In some specific embodiments, the control module is configured to, upon obtaining start permission, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling. It also collects real-time temperatures of the core and both edges of the tape, determines the temperature difference exceeding the standard and its level, matches corresponding amplitudes of zoned cooling water flow rate directional adjustment, and simultaneously completes inter-segment data transfer, temperature threshold determination, control valve limiting, and flow interlock determination. This includes: Only when the temperature difference between the two sides of the belt and the core meets the standard for a duration that meets the preset cumulative stabilization time is it determined that the preheating and cooling section is completed and smoothly switched to the main cooling section. If the temperature difference between the two sides of the belt and the core does not meet the standard but the belt has already moved to the end of the section, the final flow parameters of this section are locked and the temperature difference and adjustment status data are synchronously transmitted to the main cooling section to perform subsequent compensation and adjustment.

[0031] It should be understood that the quantitative threshold is set as follows: the temperature difference between the two edges and the core reaches the standard threshold of ±3℃, and the preset cumulative stabilization time is 5s. That is, if the temperature difference remains within ±3℃ for 5 seconds, the preheating and cooling section is considered complete. The preheating and cooling section is equipped with a position sensor to detect the belt's movement position in real time. If the belt reaches the end of the section but the temperature difference does not reach the standard, the PLC automatically locks the cooling water flow rate of this section and synchronously transmits the temperature difference data and flow rate adjustment data to the main cooling section. The principle is that the preheating and cooling section is the initial equalization cooling stage, which needs to ensure the initial cooling stability of the belt and avoid a hasty switch to the main cooling section, which would cause the temperature difference to expand. The inter-section data transmission allows the main cooling section to directly take over the unfinished control tasks and achieve continuous compensation control.

[0032] Exemplary Operation: As the belt enters the preheating and cooling section, the system collects the temperature difference between the core and edge in real time. If the temperature difference stabilizes within ±2℃ for 5 seconds, the system automatically switches to the main cooling section. If the temperature difference remains ±4℃ at the end of the section, failing to meet the standard, the system locks the current flow rate and transmits the temperature difference data and adjustment records to the main cooling section, which then directly performs compensation adjustments. This technical solution ensures that the preheating and cooling section fully utilizes its initial equalization cooling function, preventing excessive temperature differences when the belt enters the main cooling section, reducing the control pressure on the main cooling section. Simultaneously, the inter-section data transfer achieves seamless connection of the cooling process, eliminating cooling control gaps, effectively reducing the initial temperature difference between the belt core and edge, alleviating subsequent cooling pressure, improving overall cooling uniformity, and reducing defects such as belt warping and edge shrinkage.

[0033] In some specific embodiments, the control module is configured to, upon obtaining a start-up permit, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling. It also collects real-time temperatures of the core and both edges of the tape, determines the temperature difference exceeding the standard and its level, matches corresponding amplitudes of zoned cooling water flow rate directional adjustment, and simultaneously completes inter-segment data transfer, temperature threshold determination, control valve limiting, and flow interlock determination. Furthermore, it includes: The main cooling section first performs the inter-section data transfer judgment. Specifically, when the temperature difference of the previous section meets the standard, the flow rates of the three cooling water paths of the core, left edge, and right edge are kept consistent and constant. Only the temperature and temperature difference status are monitored in real time, and no active flow adjustment is performed to maintain uniform cooling of the belt. When the temperature difference in the previous section does not meet the standard, the PLC inherits the temperature difference data and adjustment direction that has not been eliminated in the previous section, and continues to make compensatory fine adjustments to the cooling water flow rate on the corresponding side edge along the original adjustment direction. When the core temperature is higher than the main cooling and curing reference temperature, the core cooling water flow rate is increased in stages. When the core temperature is lower than the reference temperature, the core cooling water flow rate is reduced in stages. When the core temperature drops below the minimum safe cooling temperature, the flow rate is immediately locked to prevent further flow reduction. When a slight warping of the belt to one side is detected, the reverse cooling water flow is finely adjusted at the edge of the warped side until the warping signal disappears and the temperature difference returns to the standard range. The opening degree of the single-sided edge cooling water regulating valve is limited between the preset maximum safe opening degree and the minimum safe opening degree; The core flow rate adjustment range is less than or equal to a preset number of times the adjustment range of both sides, and the temperature difference and temperature status are re-evaluated in each scanning cycle.

[0034] It should be understood that the main cooling curing reference temperature is 80℃, the minimum safe cooling temperature is 40℃, the opening limit range of the single-sided edge regulating valve is 20%-80%, and the core flow rate adjustment range does not exceed twice the adjustment range of both sides. The balanced cooling logic is that when the temperature difference of the previous section meets the standard, the flow rates of the three cooling water channels remain constant, with only monitoring and no adjustment. The directional compensation cooling logic is that when the temperature difference of the previous section does not meet the standard, fine-tuning continues along the original adjustment direction. The main cooling section is equipped with a deformation sensor. When it detects warping on one side of the belt, it performs reverse flow fine-tuning on the warped side until the warping signal disappears. The principle is as follows: the main cooling section is the core shaping stage. The core temperature determines the curing degree of the belt, the temperature difference determines the flatness of the belt, the flow interlock and opening limit can prevent excessive adjustment and avoid further increasing the cooling rate of the core and edges, and the deformation linkage correction can eliminate warping defects in real time.

[0035] Exemplary Operation: The main cooling section receives data from the preheating section. If the temperature difference does not meet the standard, directional compensation cooling is initiated. The core temperature is 90℃, higher than the reference temperature. The core flow rate is increased in stages. Slight warping is detected on the left side of the strapping. Reverse flow rate adjustments are made to the left edge until the temperature difference meets the standard and the warping disappears. Throughout the process, the regulating valve opening remains at 30%, within the limit range. This technical solution achieves precise differentiated control of the main cooling section, completely solving the core problem of unbalanced cooling rates between the core and edges of the strapping. It effectively eliminates defects such as warping, uneven thickness, and residual internal stress in PET strapping, improving the dimensional accuracy and mechanical properties of the strapping. The flow rate limiting and interlocking design prevents over-cooling from causing strapping embrittlement. Real-time deformation correction significantly improves the flatness of the finished product. Simultaneously, dynamic re-judgment logic ensures real-time control, adapting to the cooling needs of different strapping specifications, making it highly versatile.

[0036] In some specific embodiments, the control module is configured to, upon obtaining a start-up permit, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling. It also collects real-time temperatures of the core and both edges of the tape, determines the temperature difference exceeding the standard and its level, matches corresponding amplitudes of zoned cooling water flow rate directional adjustment, and simultaneously completes inter-segment data transfer, temperature threshold determination, control valve limiting, and flow interlock determination. Furthermore, it includes: When the core temperature of the main cooling section and the temperature difference between the two sides are all within the standard without fluctuation, the cooling water flow rate will be smoothly reduced to the basic constant flow rate. When the temperature in the main cooling section exceeds the preset temperature difference threshold, the flow rate is corrected according to the preset amplitude. If the overall temperature at the belt outlet is greater than the preset temperature, the final cooling time will be extended. When the temperature difference between the two sides of the outlet and the core exceeds the preset temperature difference threshold again, a small adjustment of the cooling water flow rate is performed on the corresponding side edge, and the adjustment range is less than or equal to the preset minimum adjustment range. Only when the strip body does not trigger a deformation warning signal throughout the entire process, and the strip body outlet temperature, the temperature difference between the two sides and the core remains within the corresponding preset threshold range for a preset number of consecutive scanning cycles, will the strip body enter the determination module for determination.

[0037] It should be understood that the preset temperature difference threshold for the final shaping cooling section is ±2℃, the outlet temperature threshold is 50℃, the minimum adjustment range is 5%, and parameter stability is determined by the parameters remaining within the threshold range for 10 consecutive scanning cycles. Pressure holding and slow cooling involves smoothly reducing the flow rate to 30% of the base constant flow rate. Micro-compensation adjustments are only made for the side with a larger temperature difference, with minor corrections of ≤5%, and large adjustments are prohibited. The final shaping section is the stress relief stage. The principle is as follows: after the main cooling section has completed curing, the final section requires constant temperature slow cooling to eliminate stress within the belt. Minor corrections are made when the temperature difference rebounds (exceeding ±2℃) to avoid secondary deformation. Parameter stability is determined to ensure complete belt shaping and prevent deformation during subsequent winding.

[0038] Example Operation: After the main cooling section, the belt parameters meet the standards. The final stage performs pressure holding and slow cooling, reducing the flow rate to 30%. The outlet temperature is 55℃, exceeding the threshold. The cooling time is extended. If the subsequent temperature difference exceeds ±2℃, a 4% flow rate adjustment is performed on the side exceeding the standard. After the parameters stabilize for 10 consecutive cycles, the result is pushed to the judgment module. This technical solution completely eliminates the internal stress generated during the cooling process of PET strapping, preventing problems such as springback, deformation, and warping after shaping. It significantly improves the straightness and dimensional stability of the belt, ensuring a neat appearance and uniform performance of the finished product. The micro-correction design avoids secondary damage caused by large adjustments in the final stage. Parameter stability judgment further ensures that the finished product quality meets the standards, significantly improving the product yield and meeting the production precision requirements of high-end PET strapping.

[0039] In some specific embodiments, the feedback module is configured such that the PLC scans the operating parameters cyclically at fixed intervals throughout the three-stage cooling operation, sequentially completing the following: adjustment effect review, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. Real-time verification of the execution status includes: The actual traction speed is collected and compared with the reference traction speed in real time at a fixed period. When the actual traction speed is higher than the reference speed, it is determined that the cooling time of the belt is shortened and the cooling water flow rate of the cooling section is increased. When the actual traction speed is lower than the reference speed, it is determined that the belt cooling time is extended and the cooling water flow rate of the cooling section is reduced.

[0040] It should be understood that, with a base traction speed set at 10 m / min, the feedback module relies on the traction speed sensor to collect data in real time, with a fixed scanning cycle of 100 ms. When the actual speed is higher than the base speed, it is determined that the time the belt spends in the cooling section is shortened, and the cooling water flow rate is increased accordingly. When the actual speed is lower than the base speed, it is determined that the cooling time is extended, and the cooling water flow rate is reduced accordingly. The principle is that the traction speed directly determines the residence time of the belt in the cooling section. The faster the speed, the shorter the cooling time, and the greater the flow rate is needed to enhance cooling; the slower the speed, the longer the cooling time, and the less the flow rate is needed to prevent over-cooling. Through the linkage and adaptation of speed and flow rate, the cooling effect is ensured to be consistent under different production speeds.

[0041] Example operation: The production line's baseline speed is 10 m / min. When the actual operating speed increases to 12 m / min, the feedback module immediately determines that the cooling time has shortened and correspondingly increases the cooling section flow rate by 10%. When the speed drops back to 9 m / min, the flow rate is reduced by 8%, without changing the traction machine's operating speed throughout the process. This technical solution achieves dynamic linkage between the cooling system and the production line. It adapts to the cooling requirements of different production speeds without manual parameter adjustments, avoiding insufficient or excessive cooling due to speed changes. This ensures the stability of PET strapping cooling quality, is compatible with industrial continuous variable speed production, significantly improves the system's automation and adaptability, reduces manual debugging costs, and avoids product quality fluctuations caused by speed fluctuations, ensuring uniform product quality in each batch.

[0042] In some specific embodiments, the feedback module is configured such that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. When verifying the execution status in real time, it also includes: Anomalies are scanned for all operating conditions at fixed intervals, and anomalies are classified into three levels: Level 1, Level 2, and Level 3. Level 1 anomalies are single probe failures or small deviations in single-loop flow. Only an anomaly warning is output and the original regulation logic is maintained to operate normally. Level 2 anomalies are caused by dual probe failure or regulating valve jamming. The corresponding redundant module is activated to maintain basic cooling operation and suspend the graded regulation logic. Level 3 anomalies are caused by multiple temperature differences continuously exceeding the standard, automatic adjustment being completely ineffective, or cooling water supply interruption. In such cases, an independent interlock shutdown of the cooling circuit is immediately triggered, the cooling water regulating valve is closed, and only the drainage circuit is slightly opened.

[0043] It should be understood that Level 1 anomalies are single probe failures and small deviations in single-loop flow; Level 2 anomalies are dual probe failures and stuck regulating valves; Level 3 anomalies are multiple persistent temperature differences exceeding limits, ineffective regulation, and water supply interruption. The system is equipped with redundant acquisition probes and backup regulating valves. Anomaly handling is achieved through the PLC anomaly monitoring unit. The principle of graded handling is as follows: minor anomalies only issue warnings and do not interrupt production; moderate anomalies activate redundant components to maintain basic operation; severe anomalies only lock the cooling section and do not shut down the entire machine, maximizing production continuity while protecting equipment and products from damage.

[0044] Exemplary operation: If the system detects a single temperature probe failure, it is classified as a Level 1 anomaly, outputs an early warning, and maintains the regulation logic; if it detects a stuck regulating valve, it is classified as a Level 2 anomaly, activates the backup valve, and suspends tiered regulation; if it detects a water supply interruption, it is classified as a Level 3 anomaly, interlocks and shuts down the cooling section, closes the regulating valve, and leaves the drainage circuit slightly open. This technical solution enables accurate identification and tiered handling of abnormal operating conditions, preventing minor faults from escalating, reducing unplanned machine downtime, providing clear fault location for rapid repair, significantly improving production continuity and equipment operational safety, reducing product scrap rates and equipment wear caused by abnormal operating conditions, and the redundant design further enhances system reliability, making it suitable for long-term continuous industrial production.

[0045] In some specific embodiments, the feedback module is configured such that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. When verifying the execution status in real time, it also includes: The effective number of adjustments at the same location and the same temperature difference exceeding the standard is continuously counted. When the temperature difference still fails to meet the standard after a preset number of adjustments and there is no trend of improvement, it is determined that the deviation cannot be corrected by automatic graded adjustment. The automatic graded adjustment mode is immediately exited, a cooling deviation exceeding the standard warning is output, all gradient flow adjustment is stopped, and only constant basic flow operation is maintained.

[0046] It should be understood that with a preset adjustment count of 6 times, the PLC's built-in adjustment counter counts each effective adjustment for the same location and temperature difference exceeding the standard. If the temperature difference still fails to meet the standard after 6 consecutive adjustments and shows no trend of improvement, it is determined to be a deviation that automatic adjustment cannot correct. After switching to fixed flow mode, the flow rate is maintained at a constant value of 40%, and all gradient adjustments are stopped. The principle is that continuous ineffective adjustments not only fail to correct the temperature difference but also exacerbate belt deformation and waste energy. Timely switching to fixed mode can ensure basic cooling of the belt, prevent the defect from expanding, and protect actuators such as regulating valves, reducing equipment wear caused by frequent operations.

[0047] Example Operation: For a point on the conveyor belt where the temperature difference exceeds the standard, the system performs six consecutive flow rate fine-tuning adjustments. If the temperature difference still fails to meet the standard and shows no decreasing trend, the PLC immediately exits automatic graded adjustment and switches to a constant flow rate of 40%, outputting a deviation exceeding the standard warning. This technical solution effectively avoids ineffective cyclic adjustment, preventing continuous misadjustment from exacerbating defects such as deformation and uneven thickness of the PET strapping belt, protecting the cooling actuator, reducing component wear, and extending equipment lifespan. Simultaneously, the failure warning alerts operators to promptly investigate deeper problems, avoiding prolonged ineffective production, reducing production losses, improving system fault tolerance, and ensuring that even if deviations that cannot be automatically corrected occur, basic cooling can be maintained, reducing defective product output.

[0048] In some specific embodiments, the determination module is configured to, after the three-stage cooling is completed, collect the temperature difference of the outlet belt and the overall temperature, and combine this with the setting time to complete the compliance determination. For qualified belts, a release command is output; for unqualified belts, continuous correction is performed, including: When the overall temperature of the belt outlet is within the allowable deviation range of room temperature, the temperature difference between the two edges and the core is stable and meets the standard for a preset number of scanning cycles, there are no deformation warning signals, and the final cooling time meets the preset modeling time, it is judged to be qualified and a release command is output. If any one of the conditions is not met, the final monitoring and micro-correction will continue.

[0049] It should be understood that the overall temperature of the belt outlet is within ±5℃ of room temperature, the temperature difference between the two edges and the core is stable and meets the standard for 15 consecutive scanning cycles, there are no deformation warning signals, and the final cooling time meets the preset 8s shaping time. The judgment module relies on the data collected by the multi-parameter sensor at the outlet, and the PLC comprehensively compares the four conditions. The logic is that the four conditions are the core standards for qualified cooling and shaping, and none of them can be missing. Continuous correction can maximize the conversion of unqualified products into qualified products and strictly control the quality of the final product.

[0050] Example Operation: The judgment module collects outlet parameters. If all four conditions are met—temperature within ±3℃ of room temperature, temperature difference meeting the standard for 15 consecutive cycles, no deformation warning, and cooling time of 8 seconds—a release command is output. If the cooling time is only 6 seconds, the module continuously corrects the process until the time meets the standard before releasing the product. This technical solution achieves standardized and automated judgment of finished product quality, completely replacing manual quality inspection. It eliminates human judgment errors, ensuring that every roll of PET strapping meets the standards, significantly improving product yield and quality consistency. The continuous correction mechanism minimizes product scrap rates, reducing raw material and energy waste. Simultaneously, the fully automated judgment process improves production efficiency, adapts to high-speed continuous production lines, reduces labor costs, and ultimately enhances overall production efficiency.

[0051] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program goods. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program goods embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0052] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0053] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0054] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A cooling and shaping control system for the PET strapping forming process, characterized in that, include: The verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check and extrusion initial temperature prediction before the cooling process starts. After determining that all preconditions are qualified, the cooling start permit is issued. The control module is configured to continuously control the target packing tape in three stages: preheating cooling, main cooling, and final shaping cooling after obtaining the start permission. It collects the temperature of the core and both sides of the tape in real time, determines the temperature difference exceeding the standard and the level, matches the corresponding amplitude of the zoned cooling water flow direction adjustment, and simultaneously completes the inter-segment data transfer, temperature threshold determination, regulating valve limit and flow interlock judgment. The feedback module is configured to scan the operating parameters of the PLC in a fixed cycle throughout the three-stage cooling operation, and sequentially complete the adjustment effect review, flow interlock verification, traction speed adaptation, abnormal classification and handling, and adjustment failure count judgment, and verify the execution status in real time. The judgment module is configured to collect the temperature difference of the outlet belt and the overall temperature after the three-stage cooling is completed, and combine the settling time to complete the standard judgment. The qualified belt will be output as a release command, and the unqualified belt will be continuously corrected.

2. The cooling and shaping control system for the PET strapping forming process according to claim 1, characterized in that, The verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check, and extrusion initial temperature prediction before the cooling process starts. When issuing a cooling start permit after verifying that all preconditions are met, the module includes: First, perform a system hardware communication self-test to check the communication status of the PLC core module and external devices. Only if there are no communication faults, disconnections, or short circuits can you proceed to the next step. Then, the temperature acquisition probe and water pressure acquisition probe are sampled continuously for a preset number of times. When the value of the preset number of samples fluctuates within a preset small deviation range, the sampling is deemed valid. If the value fluctuation of a preset number of samples exceeds the preset range or the value of a single sample exceeds the preset small deviation range, the sampling is determined to be a failure, the abnormal probe data is blocked and the backup probe data is enabled. If there is no backup probe, a fault warning is output and the current cooling parameters are kept unchanged.

3. The cooling and shaping control system for the PET strapping forming process according to claim 2, characterized in that, The verification module is configured to perform system hardware communication self-test, data acquisition module validity verification, cooling water precondition check, and extrusion initial temperature prediction before the cooling process starts. When issuing a cooling start permit after verifying that all preconditions are met, it also includes: The cooling water inlet temperature and inlet water pressure are collected in real time. When the cooling water inlet temperature is lower than the preset upper limit temperature of cooling water and the cooling water inlet water pressure is within the normal working water pressure range, the cooling water source is deemed to be in good working condition. When the cooling water inlet temperature is greater than or equal to the preset upper limit temperature of cooling water or the cooling water inlet pressure is lower than the normal operating water pressure range, an abnormal water source warning will be output and the minimum basic flow rate of cooling water will be maintained. When the cooling water inlet pressure is higher than the normal operating water pressure range, the maximum opening of the regulating valve is limited and water circuit pressure regulation is performed. After completing the pre-cooling water condition check, the initial overall temperature of the PET strapping extrusion die outlet is collected to determine whether the initial overall temperature of the PET strapping extrusion die outlet meets the cooling start-up benchmark requirements. When the initial overall temperature at the outlet of the PET strapping extrusion die reaches the cooling start benchmark requirement, a cooling start permit is issued. Otherwise, maintain basic cooling standby mode.

4. The cooling and shaping control system for the PET strapping forming process according to claim 3, characterized in that, The control module is configured to, upon obtaining start permission, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling. It collects real-time temperatures of the core and both edges of the tape, determines the temperature difference exceeding the standard and its level, and matches corresponding amplitudes of zoned cooling water flow rate directional adjustment. Simultaneously, it completes inter-segment data transfer, temperature threshold determination, regulating valve limiting, and flow interlock judgment, including: Only when the temperature difference between the two sides of the belt and the core meets the standard for a duration that meets the preset cumulative stabilization time is it determined that the preheating and cooling section is completed and smoothly switched to the main cooling section. If the temperature difference between the two sides of the belt and the core does not meet the standard but the belt has already moved to the end of the section, the final flow parameters of this section are locked and the temperature difference and adjustment status data are synchronously transmitted to the main cooling section to perform subsequent compensation and adjustment.

5. A cooling and shaping control system for the PET strapping forming process according to claim 4, characterized in that, The control module is configured to, upon obtaining start permission, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling. It also collects real-time temperatures of the core and both edges of the tape, determines the temperature difference exceeding the standard and its level, matches corresponding amplitudes for directional adjustment of the zoned cooling water flow, and simultaneously performs inter-segment data transfer, temperature threshold determination, regulating valve limiting, and flow interlock judgment. Furthermore, it includes: The main cooling section first performs the inter-section data transfer judgment. Specifically, when the temperature difference of the previous section meets the standard, the flow rates of the three cooling water paths of the core, left edge, and right edge are kept consistent and constant. Only the temperature and temperature difference status are monitored in real time, and no active flow adjustment is performed to maintain uniform cooling of the belt. When the temperature difference in the previous section does not meet the standard, the PLC inherits the temperature difference data and adjustment direction that has not been eliminated in the previous section, and continues to make compensatory fine adjustments to the cooling water flow rate on the corresponding side edge along the original adjustment direction. When the core temperature is higher than the main cooling and curing reference temperature, the core cooling water flow rate is increased in stages. When the core temperature is lower than the reference temperature, the core cooling water flow rate is reduced in stages. When the core temperature drops below the minimum safe cooling temperature, the flow rate is immediately locked to prevent further flow reduction. When a slight warping of the belt to one side is detected, the reverse cooling water flow is finely adjusted at the edge of the warped side until the warping signal disappears and the temperature difference returns to the standard range. The opening degree of the single-sided edge cooling water regulating valve is limited between the preset maximum safe opening degree and the minimum safe opening degree; The core flow rate adjustment range is less than or equal to a preset number of times the adjustment range of both sides, and the temperature difference and temperature status are re-evaluated in each scanning cycle.

6. A cooling and shaping control system for the PET strapping forming process according to claim 5, characterized in that, The control module is configured to, upon obtaining start permission, sequentially perform three stages of continuous control on the target packing tape: preheating cooling, main cooling, and final shaping cooling. It also collects real-time temperatures of the core and both edges of the tape, determines the temperature difference exceeding the standard and its level, matches corresponding amplitudes for directional adjustment of the zoned cooling water flow, and simultaneously performs inter-segment data transfer, temperature threshold determination, regulating valve limiting, and flow interlock judgment. Furthermore, it includes: When the core temperature of the main cooling section and the temperature difference between the two sides are all within the standard without fluctuation, the cooling water flow rate will be smoothly reduced to the basic constant flow rate. When the temperature in the main cooling section exceeds the preset temperature difference threshold, the flow rate is corrected according to the preset amplitude. If the overall temperature at the belt outlet is greater than the preset temperature, the final cooling time will be extended. When the temperature difference between the two sides of the outlet and the core exceeds the preset temperature difference threshold again, a small adjustment of the cooling water flow rate is performed on the corresponding side edge, and the adjustment range is less than or equal to the preset minimum adjustment range. Only when the strip body does not trigger a deformation warning signal throughout the entire process, and the strip body outlet temperature, the temperature difference between the two sides and the core remains within the corresponding preset threshold range for a preset number of consecutive scanning cycles, will the strip body enter the determination module for determination.

7. A cooling and shaping control system for the PET strapping forming process according to claim 6, characterized in that, The feedback module is configured so that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the following: adjustment effect review, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. Real-time verification of the execution status includes: The actual traction speed is collected and compared with the reference traction speed in real time at a fixed period. When the actual traction speed is higher than the reference speed, it is determined that the cooling time of the belt is shortened and the cooling water flow rate of the cooling section is increased. When the actual traction speed is lower than the reference speed, it is determined that the belt cooling time is extended and the cooling water flow rate of the cooling section is reduced.

8. A cooling and shaping control system for the PET strapping forming process according to claim 7, characterized in that, The feedback module is configured so that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. During real-time verification of the execution status, it also includes: Anomalies are scanned for all operating conditions at fixed intervals, and anomalies are classified into three levels: Level 1, Level 2, and Level 3. Level 1 anomalies are single probe failures or small deviations in single-loop flow. Only an anomaly warning is output and the original regulation logic is maintained to operate normally. Level 2 anomalies are caused by dual probe failure or regulating valve jamming. The corresponding redundant module is activated to maintain basic cooling operation and suspend the graded regulation logic. Level 3 anomalies are caused by multiple temperature differences continuously exceeding the standard, automatic adjustment being completely ineffective, or cooling water supply interruption. In such cases, an independent interlock shutdown of the cooling circuit is immediately triggered, the cooling water regulating valve is closed, and only the drainage circuit is slightly opened.

9. A cooling and shaping control system for the PET strapping forming process according to claim 8, characterized in that, The feedback module is configured so that the PLC scans the operating parameters cyclically at a fixed period throughout the three-stage cooling operation, sequentially completing the re-judgment of adjustment effect, flow interlock verification, traction speed adaptation, anomaly classification and handling, and adjustment failure count judgment. During real-time verification of the execution status, it also includes: The effective number of adjustments at the same location and the same temperature difference exceeding the standard is continuously counted. When the temperature difference still fails to meet the standard after a preset number of adjustments and there is no trend of improvement, it is determined that the deviation cannot be corrected by automatic graded adjustment. The automatic graded adjustment mode is immediately exited, a cooling deviation exceeding the standard warning is output, all gradient flow adjustment is stopped, and only constant basic flow operation is maintained.

10. A cooling and shaping control system for the PET strapping forming process according to claim 9, characterized in that, The judgment module is configured to collect the outlet temperature difference and overall temperature of the belt after three-stage cooling, and combine this with the setting time to complete the compliance judgment. For qualified belts, a release command is output; for unqualified belts, continuous correction is performed, including: When the overall temperature of the belt outlet is within the allowable deviation range of room temperature, the temperature difference between the two edges and the core is stable and meets the standard for a preset number of scanning cycles, there are no deformation warning signals, and the final cooling time meets the preset modeling time, it is judged to be qualified and a release command is output. If any one of the conditions is not met, the final monitoring and micro-correction will continue.

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