An automatic film cutting control system and method for bottled mineral water

Abstract

This invention relates to the field of bottled mineral water film cutting control technology, proposing an automatic film cutting control system and method for bottled mineral water. The method includes: identifying the spectral characteristics of the packaging film at the bottle opening using a sensor to identify the material type of the packaging film; calculating cryogenic treatment parameters based on heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the bottle; performing cryogenic treatment on the packaging film at the bottle opening; triggering an auxiliary film removal mechanism to remove the loosened packaging film from the bottle opening with peeling force, while simultaneously activating a negative pressure adsorption device to collect the removed waste film; calculating the residual film area in the final image using an image analysis algorithm, comparing the residual film area with a preset qualified threshold, and outputting a qualified signal. This invention utilizes the difference in heat shrinkage rates between the PC bottle and the packaging film under cryogenic conditions, automatically changing the packaging film from a tightly adhered state to a loose state, using low peeling force to assist in removal, avoiding scratches at the bottle opening and fragment contamination, thus ensuring the hygiene and safety of mineral water bottling.

Description

Technical Field

[0001] This invention relates to the field of bottled mineral water film cutting control technology, and in particular to an automatic bottled mineral water film cutting control system and method. Background Technology

[0002] Before bottled mineral water is bottled, the recycled empty bottles need to be cleaned, disinfected, and pre-treated for filling. Because the bottle openings of the recycled mineral water bottles are covered with heat-shrink packaging film during storage and transportation, this film, made of heat-shrinkable film materials such as polyolefin (POF), polyvinyl chloride (PVC), or polyester (PET), tightly wraps the bottle opening surface after being heated and shrunk, serving to prevent dust and dirt and ensure hygiene. Therefore, the packaging film must be removed from the bottle opening before filling; this process is usually called "film cutting" or "film removal."

[0003] With the increasing automation of bottled water production lines, automatic film cutting equipment has become an important supporting equipment for bottled water production enterprises. Currently, the main technical approaches for automatic film cutting in bottled water production can be divided into the following three categories: Firstly, there is the hot air film cutting technology. This technology heats air using an air heating element, and a blower blows the hot air towards the packaging film at the bottle opening. The high temperature melts or softens the film, which is then blown away from the bottle opening by the airflow. For example, CN218965641U discloses an automatic film cutting device for bottled water. Its structure includes components such as a base, rollers, a worktable, a horizontal cylinder, a limit plate, an air heating element, a blower, a photoelectric switch, and an induction switch. The photoelectric switch detects the bottle's position signal and triggers the hot air device to perform the film cutting operation.

[0004] Secondly, there is mechanical film cutting technology. This technology physically cuts the packaging film using blades or high-pressure gas. For example, film cutting and cap removing machines use nozzles to spray high-pressure gas to cut and blow away the film, and then use multi-stage telescopic rods to remove the cap, integrating film cutting and cap removal functions into one unit. In addition, some automatic film removal machines in filling lines are also equipped with a hot air blower that works in conjunction with the film removal mechanism, and integrate a negative pressure adsorption film collection box into the equipment to collect waste film.

[0005] However, the aforementioned existing technologies still have the following technical shortcomings in the application of bottled mineral water cutting: First, the industry suffers from a long-standing "technical bias"—that film removal must be achieved through cutting or heating. Because the industry has long relied on two technical routes—"mechanical cutting" and "hot air heating"—technical personnel have developed a fixed understanding of how to remove packaging film from barrel openings, believing that the film must be removed through physical cutting or high-temperature melting. This technical bias prevents the consideration of other possibilities for removal by utilizing changes in the interfacial physical properties between the packaging film and the barrel opening, hindering the diversified development of this technological field.

[0006] Secondly, existing technologies are insufficiently adaptable to individual differences in packaging films. Bottled water packaging films are not uniformly made—POF films have excellent cold resistance, remaining flexible and resistant to breakage even at -50℃, while also possessing good toughness and high tear strength; PVC films are prone to embrittlement at low temperatures and soften and deform at high temperatures, exhibiting insufficient shrinkage stability; PET films have good weather resistance and mechanical stability. Different film materials exhibit significantly different response characteristics to hot air and mechanical cutting, resulting in large fluctuations in the cutting effect of existing film-cutting solutions. Consequently, the film removal rate of many current devices "depends on the quality of the bottles used by the manufacturer, the thickness of the shrink film, and the degree of dirt and damage to the shrink film," the fundamental reason being that the cutting parameters cannot be dynamically adjusted according to the actual condition of each bottle's film.

[0007] Third, the interface status cannot be monitored in real time during the film cutting process, and parameter adjustments are delayed. In existing technologies, the setting of film cutting parameters relies entirely on preset values ​​or human experience. When the adhesion between the packaging film and the barrel opening changes due to differences in film material, thickness, and bonding time, the film cutting equipment cannot detect this change in real time and make corresponding adjustments, resulting in uncontrollable fluctuations in film cutting quality. Summary of the Invention

[0008] In view of the above, the main objective of this invention is to provide an automatic film cutting control system and method for bottled mineral water to solve the aforementioned technical problems.

[0009] This invention proposes an automatic film-cutting control method for bottled mineral water, the method comprising the following steps: Step 1: The bottled mineral water barrel is conveyed to the film cutting station. The positioning sensor detects the barrel's arrival signal and fixes the barrel, generating a positioning signal. Based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result. Step 2: The controller receives the membrane material identification result, queries the preset heat shrinkage characteristic data table to obtain the heat shrinkage characteristic data corresponding to the membrane material identification result; based on the heat shrinkage characteristic data, and combined with the current ambient temperature and the initial temperature of the barrel, it calculates the cryogenic treatment parameters to generate cryogenic control commands. Step 3: The controller sends the cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the mouth of the barrel, so that the PC barrel and the packaging film undergo asynchronous dimensional changes due to the difference in thermal shrinkage rate, until the packaging film changes from a tightly attached state to a loose state, generating a film loosening state signal. Step 4: After receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loose packaging film from the barrel opening with peeling force. At the same time, the negative pressure adsorption device is activated to collect the removed waste film and generate a film removal completion signal. Step 5: After receiving the film removal completion signal, the controller triggers the vision detection device to acquire the final image of the barrel opening. The residual film area of ​​the final image is calculated by the image analysis algorithm, and the residual film area is compared with the preset qualified threshold. If the residual film area is less than the preset qualified threshold, a qualified signal is output; if the residual film area exceeds the preset qualified threshold, a compensation film removal strategy is executed, and the data generated during this film removal process is fed back to the controller to update the preset heat shrinkage characteristic data table.

[0010] This invention also proposes an automatic film-cutting control system for bottled mineral water, the system comprising: The barrel positioning and material recognition module is used for: The bottled mineral water barrels are conveyed to the film cutting station. The positioning sensor detects the barrel's arrival signal and fixes the barrel, generating a positioning signal. Based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result. The cryogenic parameter decision module is used for: The controller receives the membrane material identification result, retrieves the corresponding heat shrinkage characteristic data from the preset heat shrinkage characteristic data table, and calculates the cryogenic treatment parameters based on the heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the barrel, to generate cryogenic control commands. Cryogenic actuation and membrane loosening triggering module, used for: The controller sends the cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the barrel opening, causing the PC barrel and the packaging film to undergo asynchronous dimensional changes due to the difference in thermal shrinkage rate, until the packaging film changes from a tightly adhered state to a loose state, generating a film loosening state signal. The auxiliary membrane removal and waste membrane collection module is used for: After receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loose packaging film from the barrel opening with peeling force, and at the same time starts the negative pressure adsorption device to collect the removed waste film and generates a film removal completion signal. The visual verification and compensation control module is used for: After receiving the film removal completion signal, the controller triggers the vision detection device to acquire the final image of the barrel opening. The controller calculates the residual film area of ​​the final image using an image analysis algorithm and compares the residual film area with a preset qualified threshold. If the residual film area is less than the preset qualified threshold, a qualified signal is output. If the residual film area exceeds the preset qualified threshold, a compensation film removal strategy is executed, and the data generated during this film removal process is fed back to the controller to update the preset heat shrinkage characteristic data table.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention overcomes the technical prejudice that "film cutting must rely on cutting or heating." By utilizing the difference in thermal shrinkage rates between the PC barrel and the packaging film under cryogenic conditions, the packaging film automatically changes from a tightly adhered state to a loose state, and is then removed with the assistance of low peel force. The entire process does not require any blades to come into contact with the barrel opening, avoiding scratches and debris contamination, and fundamentally ensuring the hygiene and safety of mineral water bottling.

[0012] 2. This invention uses near-infrared spectroscopy to identify the packaging film material (POF / PVC / PET) in real time and automatically queries the corresponding heat shrinkage characteristic data from a pre-set heat shrinkage characteristic data table to dynamically generate cryogenic treatment parameters (cooling rate, final temperature). Compared with the fixed parameter mode of the existing technology, this invention achieves precise control of "one policy per container", significantly improving the success rate of film cutting in scenarios with mixed materials.

[0013] 3. This invention introduces a safety verification module in the cryogenic parameter decision-making stage to ensure that the cooling rate and final temperature are always above the stress tolerance threshold and low-temperature embrittlement temperature of the PC tank material. When parameters exceed the safe range, a correction process is automatically triggered, updating the data table through a weighted moving average. This mechanism effectively avoids tank damage caused by improper parameters, extending the reusable life of the water tank.

[0014] 4. During the cryogenic process, this invention collects the surface temperature of the packaging film in real time and compares it with the final temperature parameter in a closed loop, dynamically adjusting the injection flow rate. After reaching the final temperature, it automatically switches to the heat preservation mode, ensuring temperature field uniformity through fluctuation tolerance judgment and temperature compensation. Compared with open-loop preset time cryogenic treatment, this invention significantly improves the consistency and reliability of film loosening.

[0015] 5. This invention quantifies the residual film area through visual inspection after film cutting, implements a compensation film removal strategy for defective barrels, and uses the parameter deviation values ​​during the compensation process to update the heat shrinkage characteristic data table using a weighted moving average. This mechanism transforms the failure experience of the current barrel into optimization parameters for subsequent barrels, achieving a "the more it's used, the smarter it becomes" group self-learning ability, and significantly reducing the defect rate in long-term operation.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by means of embodiments of the invention. Attached Figure Description

[0017] Figure 1 This is a flowchart of the automatic film cutting control method for bottled mineral water proposed in this invention.

[0018] Figure 2 This is a diagram showing the overall architecture of the automatic film-cutting control system for bottled mineral water proposed in this invention.

[0019] Figure 3 This is a graph showing the film removal effect of existing technology (hot air film cutting) at various temperatures.

[0020] Figure 4 This is a graph showing the film removal effect of the present invention at various temperatures. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] These and other aspects of the embodiments of the present invention will become clear from the following description and accompanying drawings. In these descriptions and drawings, some specific embodiments of the present invention are specifically disclosed to illustrate some ways of implementing the principles of the embodiments of the present invention; however, it should be understood that the scope of the embodiments of the present invention is not limited thereto.

[0023] Please see Figure 1 This embodiment provides an automatic film cutting control method for bottled mineral water, the method including the following steps: Step 1: The bottled mineral water barrel is conveyed to the film cutting station. The positioning sensor detects the barrel's arrival signal and fixes the barrel, generating a positioning signal. Based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result.

[0024] In step 1, based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate the film material identification result. Specifically, the steps include the following: The controller receives the positioning signal, generates a sensor start command based on the positioning signal, and sends the sensor start command to the identification sensor to generate an identification sensor ready status signal. In response to the readiness status signal of the identification sensor, the controller controls the identification sensor to emit near-infrared detection light toward the packaging film at the mouth of the barrel, and receives the spectral signal reflected or transmitted back by the packaging film to generate raw spectral signal data. The original spectral signal data is subjected to analog-to-digital conversion, and then digital filtering is performed to remove environmental noise interference and generate a preprocessed digital spectral signal. The controller is used to extract features from the preprocessed digital spectral signal, extracting the absorption peak positions and absorption intensity parameters of the packaging film within the preset characteristic wavelength range, and generating the spectral feature vector of the packaging film. The spectral feature vector of the packaging film is compared with the standard spectral feature vector stored in the pre-set material feature data table. The similarity between the spectral feature vector and the standard spectral feature vector of each material is calculated, and the similarity comparison result is generated. Based on the similarity comparison results, the material type with the highest similarity is selected to generate the membrane material identification result.

[0025] In this embodiment of the invention, the present invention solves the technical problem of existing bottled water cutting equipment being unable to identify differences in packaging film materials, resulting in inconsistent cutting parameters due to the "one-size-fits-all" approach. Specifically, after receiving a positioning signal, the controller generates a sensor activation command, triggering the identification sensor to emit near-infrared detection light towards the packaging film at the bottle opening, and receiving reflected or transmitted spectral signals. These signals are then processed sequentially through analog-to-digital conversion, digital filtering to remove environmental noise, and feature extraction to obtain a spectral feature vector. This vector is then compared with the standard spectral feature vector in a pre-set material feature data table to determine the highest similarity material type as the film material identification result. Through this series of processes, the present invention achieves automatic, rapid, and accurate identification of packaging films of different materials (POF, PVC, PET), providing a reliable data foundation for subsequent differentiated cryogenic parameter decisions, thereby significantly improving the adaptability of the cutting process to mixed packaging film materials.

[0026] Step 2: The controller receives the membrane material identification result, retrieves the heat shrinkage characteristic data corresponding to the membrane material identification result from the preset heat shrinkage characteristic data table, and calculates the cryogenic treatment parameters based on the heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the barrel, to generate cryogenic control commands.

[0027] In step 2, based on the heat shrinkage characteristic data, and combined with the current ambient temperature and the initial temperature of the barrel, the cryogenic treatment parameters are calculated to generate cryogenic control commands. This specifically includes the following steps: The controller receives the thermal shrinkage characteristic data corresponding to the membrane material identification result, and at the same time obtains the current ambient temperature and the initial temperature of the barrel to generate the input dataset required for the calculation of cryogenic parameters. Based on the heat shrinkage rate in the heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the barrel, the initial value of the cooling rate is calculated according to the preset cooling rate mapping relationship, and the cooling rate reference parameter is generated. Based on the lower limit of the embrittlement temperature and the initial temperature of the barrel in the heat shrinkage characteristic data, combined with the heat exchange characteristics of the cryogenic treatment medium, the initial value of the endpoint temperature is calculated, and the endpoint temperature reference parameter is generated. Safety verification was performed on the cooling rate reference parameter and the endpoint temperature reference parameter to verify whether the cooling rate reference parameter was lower than the stress bearing threshold of the PC barrel and whether the endpoint temperature reference parameter was higher than the low temperature embrittlement temperature of the PC barrel, so as to generate the safety verification results of the cryogenic treatment parameters. If the cryogenic treatment parameter safety verification result is passed, the cryogenic control command is generated by using the cooling rate reference parameter and the endpoint temperature reference parameter as the cryogenic treatment parameters. If the cryogenic treatment parameter safety verification result is failed, the parameter correction process is triggered, the cooling rate corresponding to the cooling rate reference parameter and the endpoint temperature corresponding to the endpoint temperature reference parameter are adjusted to within the safety threshold range, the corrected cryogenic control command is generated, and the corrected cryogenic control command is output as the cryogenic control command.

[0028] In this embodiment of the invention, by constructing a heat shrinkage characteristic data table and combining it with a safety verification mechanism, the technical problems of existing technologies, such as the reliance on manual experience to set cryogenic treatment parameters, inability to adapt to real-time operating conditions, and easy damage to the PC barrel, are solved. Specifically, the controller queries the corresponding heat shrinkage rate, embrittlement temperature lower limit, and other data from the preset heat shrinkage characteristic data table based on the film material identification result. Then, combined with the current ambient temperature and the initial temperature of the barrel, it calculates the cooling rate benchmark parameter and the endpoint temperature benchmark parameter according to a preset mapping relationship. Subsequently, these two benchmark parameters are safely verified to ensure that the cooling rate is lower than the stress tolerance threshold of the PC barrel and the endpoint temperature is higher than the low-temperature embrittlement temperature of the PC barrel. If the verification passes, the cryogenic control command is directly encapsulated; if it fails, the parameter correction process is triggered to adjust the parameters to within the safe threshold range. Through the above means, the present invention achieves dynamic, safe, and adaptive generation of cryogenic treatment parameters, ensuring the low-temperature conditions required for effective loosening of the packaging film, avoiding barrel cracking or fatigue damage caused by improper parameters, and extending the reuse life of the water barrel.

[0029] In a preferred embodiment of the present invention, a parameter correction process is triggered to adjust the cooling rate corresponding to the cooling rate reference parameter and the endpoint temperature corresponding to the endpoint temperature reference parameter to a safe threshold range. A corrected cryogenic control command is then generated and output as the corrected cryogenic control command. Specifically, the process includes the following steps: S201. Extract the excess cooling rate and excess endpoint temperature from the safety verification results of cryogenic treatment parameters to generate a parameter correction dataset. S202. Compare the cooling rate excess in the parameter correction dataset with the preset cooling rate safety margin value to obtain a first comparison result. Calculate the cooling rate correction coefficient based on the first comparison result and multiply the cooling rate reference parameter by the cooling rate correction coefficient to generate the corrected cooling rate value. S203. Compare the endpoint temperature excess in the parameter correction dataset with the preset endpoint temperature safety margin value to obtain a second comparison result. Calculate the endpoint temperature correction coefficient based on the second comparison result and add the endpoint temperature reference parameter to generate the corrected endpoint temperature value. S204. Perform secondary verification on the corrected cooling rate value and the corrected endpoint temperature value to generate secondary safety verification results; S205. If the secondary safety verification result is passed, the corrected cooling rate value and the corrected endpoint temperature value are output as cryogenic control commands. If the secondary safety verification result is failed, steps S201 to S204 are repeated until the secondary safety verification result is passed or the preset maximum number of corrections is reached. The final corrected cooling rate value and the final corrected endpoint temperature value are then output as cryogenic control commands.

[0030] In this embodiment of the invention, the parameter correction process is further refined. A multi-level progressive mechanism—including extracting excess values, comparing safety margins, calculating correction coefficients, and secondary verification—solves the technical problem of parameter instability caused by incomplete or over-correction in a single correction. Specifically, excess cooling rate and excess endpoint temperature are extracted from the safety verification results to generate a parameter correction dataset. The excess values ​​are compared with preset safety margin values ​​for cooling rate and endpoint temperature, respectively, and the corresponding correction coefficients are calculated to obtain the corrected cooling rate and endpoint temperature values. Subsequently, a secondary safety verification is performed on the corrected parameters. If successful, the result is output; otherwise, the above steps are repeated until successful or the maximum number of corrections is reached. Through this closed-loop correction strategy, the invention ensures that the cryogenic processing parameters always converge within a safe and effective range, avoiding parameter oscillations caused by single correction deviations and improving the robustness and reliability of the system.

[0031] Step 3: The controller sends the cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the barrel opening. This causes the PC barrel and the packaging film to undergo asynchronous dimensional changes due to the difference in thermal shrinkage rates, until the packaging film changes from a tightly adhered state to a loose state, generating a film loosening state signal.

[0032] In step 3, the controller sends a cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the barrel opening. This causes asynchronous dimensional changes between the PC barrel and the packaging film due to the difference in thermal shrinkage rates, until the packaging film changes from a tightly adhered state to a loose state, generating a film loosening state signal. The specific steps include the following: S301. The controller receives the cryogenic control command, extracts the cooling rate parameter and the endpoint temperature parameter from the cryogenic control command, and generates a cryogenic execution parameter set. S302. Send the cryogenic execution parameter set to the control valve of the cryogenic medium injection device to trigger the cryogenic medium injection device to start the pre-injection self-test process and generate a cryogenic medium injection device ready status signal. S303. Based on the cooling rate parameters in the cryogenic execution parameter set, calculate the instantaneous injection flow rate of the cryogenic medium according to the preset injection flow rate mapping relationship, and generate an injection flow rate control command. S304. After receiving the cryogenic medium injection device ready status signal, the injection flow control command is sent to the flow regulating valve of the cryogenic medium injection device to control the cryogenic medium to be injected onto the surface of the packaging film at the barrel opening at the instantaneous injection flow rate, enter the cryogenic treatment stage, and start the timer to record the injection duration and generate a cryogenic treatment in progress status signal. S305. After the cryogenic treatment in progress status signal is triggered, the cryogenic treatment stage is entered. According to the preset time sampling interval, the surface temperature of the packaging film is collected in real time by the temperature sensor arranged on the surface of the packaging film at the mouth of the barrel, and a real-time surface temperature data sequence is generated. S306. Compare the current temperature value in the real-time surface temperature data sequence with the endpoint temperature parameter in the cryogenic execution parameter set. If the current temperature value is higher than the endpoint temperature parameter, the controller returns to S304 and adjusts the instantaneous injection flow rate and continues to execute the cryogenic process. If the current temperature value is lower than or equal to the endpoint temperature parameter, the controller executes the safe and controlled cryogenic process and generates a safe and controlled cryogenic process completion signal. S307. After receiving the signal that the safe and controlled cryogenic treatment is completed, the controller triggers the film loosening detection sensor to detect changes in the adhesion between the packaging film and the surface of the barrel opening. When the packaging film changes from a tightly adhered state to a partially lifted or overall loose state, a film loosening state signal is generated.

[0033] In this embodiment of the invention, the present invention solves the technical problem of uneven cooling and inconsistent film loosening effect caused by differences in film temperature response in open-loop cryogenic treatment by introducing a real-time temperature feedback and closed-loop flow regulation mechanism. Specifically, the controller extracts the cooling rate and endpoint temperature parameters from the cryogenic control command, calculates the instantaneous injection flow rate after pre-spray self-check, and starts the cryogenic treatment. During the treatment, the surface temperature of the packaging film is collected in real time by a temperature sensor at preset sampling intervals and compared with the endpoint temperature parameter. If the current temperature is higher than the endpoint temperature, the injection flow rate is adjusted and the treatment continues, forming a closed-loop feedback. If the current temperature is lower than or equal to the endpoint temperature, the process switches to a safe and controlled cryogenic treatment process. Through this real-time temperature closed-loop control, the present invention achieves precise control of the cooling process of each packaging film, significantly improving the consistency and repeatability of film loosening.

[0034] In a preferred embodiment of the present invention, the controller executes a safe and controlled cryogenic process and generates a safe and controlled cryogenic process completion signal, specifically including the following steps: S3061. When the current temperature value is lower than or equal to the endpoint temperature parameter, switch the cryogenic medium injection device to the heat preservation mode, and spray the cryogenic medium onto the surface of the packaging film at the barrel opening with a maintenance injection flow rate lower than the initial injection flow rate, and generate a maintenance injection flow rate control command. S3062. The injection flow control command is sent to the flow regulating valve of the cryogenic medium injection device to control the cryogenic medium to maintain the injection flow for a preset heat preservation time, and the surface temperature of the packaging film is continuously monitored by a temperature sensor during the heat preservation time to generate temperature monitoring data for the heat preservation stage. S3063. Based on the temperature monitoring data during the heat preservation stage, determine whether the surface temperature of the packaging film is stable within the preset fluctuation tolerance range of the endpoint temperature parameter. If it exceeds the preset fluctuation tolerance range of the endpoint temperature parameter, adjust and maintain the injection flow rate for temperature compensation, generate a temperature compensation control record, store the temperature compensation control record in the controller, and return to step S3062 to re-execute; if it is within the preset fluctuation tolerance range of the endpoint temperature parameter, control the cryogenic medium injection device to stop injection and generate a cryogenic medium injection stop signal. S3064. After receiving the cryogenic medium injection stop signal, the controller triggers the timer and records the waiting time after the cryogenic medium injection stops. At the same time, it collects the surface temperature rise data of the packaging film during the waiting process to generate temperature change curve data of the waiting stage. S3065. Based on the temperature change curve data during the static waiting period, calculate the static waiting time required for the packaging film to reach the preset film loosening detection trigger temperature, and generate a static waiting time calculation value; when the actual static waiting time reaches the static waiting time calculation value, obtain a signal indicating that the safe and controlled cryogenic treatment is complete.

[0035] In this embodiment of the invention, by designing sub-steps such as a heat preservation mode, fluctuation tolerance judgment, and static waiting temperature recovery calculation, the technical problem of uneven temperature field and insufficient film loosening caused by immediately stopping spraying after the cryogenic treatment reaches the endpoint temperature is solved. Specifically, when the surface temperature of the packaging film drops below the endpoint temperature, the cryogenic medium spraying device switches to the heat preservation mode, continuously spraying at a lower maintenance spray flow rate for a preset heat preservation time, while monitoring whether the temperature is stable within the endpoint temperature ± preset fluctuation tolerance range; if it exceeds the tolerance, temperature compensation is performed and heat preservation monitoring is repeated; if it is within the tolerance, spraying stops and a static waiting stage is entered; during the static waiting stage, data on the change in film surface temperature recovery are collected, and the waiting time required to reach the film loosening detection trigger temperature is calculated. Once the actual waiting time reaches the calculated value, a safe and controlled cryogenic treatment completion signal is output. Through the above multi-stage fine control, this invention ensures that the temperature field between the PC barrel and the packaging film is sufficiently uniform, maximizing the effect of film loosening driven by the difference in thermal shrinkage rate, while avoiding excessive embrittlement of the film or damage to the barrel due to excessively low temperature.

[0036] Step 4: After receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loosened packaging film from the barrel opening with peeling force. At the same time, the negative pressure adsorption device is activated to collect the removed waste film and generate a film removal completion signal.

[0037] In step 4, after receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loosened packaging film from the barrel opening with peeling force. At the same time, the negative pressure adsorption device is activated to collect the removed waste film and generate a film removal completion signal. The specific steps include the following: The controller receives the membrane loosening status signal and generates an auxiliary membrane removal start command. The auxiliary membrane removal start command is sent to the controller port of the auxiliary membrane removal mechanism, generating an auxiliary membrane removal mechanism ready status signal. After the auxiliary film removal mechanism is ready, the corresponding peel force amplitude parameter and peel angle parameter are queried from the preset peel force parameter table according to the film material identification result to generate the peel force execution parameter set; The execution parameters in the peel force execution parameter set are sent to the execution unit of the auxiliary film removal mechanism. The auxiliary film removal mechanism is controlled to apply a directional peel force to the packaging film that is already in a loose state with the peel force amplitude and peel angle in the peel force execution parameter set, so that the packaging film is removed from the edge of the barrel as a whole, and a film removal status signal is generated. While applying directional peeling force to the already loose packaging film, a negative pressure adsorption synchronous start command is generated and sent to the vacuum pump control port of the negative pressure adsorption device to control the negative pressure adsorption device to start negative pressure suction and generate a negative pressure adsorption device running status signal. After receiving the membrane removal status signal and the negative pressure adsorption device operation status signal, the controller triggers the position sensor at the inlet of the waste film collection box to detect whether the removed packaging film has fallen into the waste film collection box and generates a waste film collection confirmation signal. After receiving the waste film collection confirmation signal, the controller sends the film removal completion signal to the conveying device controller, which then controls the conveying device to move the barrel out of the film cutting station and generate the film removal completion signal.

[0038] In this embodiment of the invention, a triple mechanism—differentiated peel force control based on material identification, timing synchronization of peeling and negative pressure adsorption, and waste film collection detection—solves the technical problem of membrane tearing and fragmentation caused by mismatched peel force during existing assisted film removal processes, resulting in waste film scattering and environmental pollution. Specifically, the controller queries the corresponding peel force amplitude and peel angle from a preset peel force parameter table based on the membrane material identification result, generates a peel force execution parameter set, and controls the auxiliary film removal mechanism to remove the loosened packaging film as a whole with precise peeling parameters. Simultaneously, the negative pressure adsorption device is activated to achieve "peeling and adsorption at the same time," avoiding waste film splashing. Finally, the arrival sensor at the inlet of the waste film collection box detects whether the waste film has successfully fallen into the collection box, and only after generating a confirmation signal can the film removal completion signal be output. Through this series of coordinated controls, the present invention achieves low-damage, splash-free, and traceable waste film collection, significantly improving the hygiene conditions and operational stability of the film cutting station.

[0039] Step 5: After receiving the film removal completion signal, the controller triggers the vision detection device to acquire the final image of the barrel opening. The residual film area of ​​the final image is calculated by the image analysis algorithm, and the residual film area is compared with the preset qualified threshold. If the residual film area is less than the preset qualified threshold, a qualified signal is output; if the residual film area exceeds the preset qualified threshold, a compensation film removal strategy is executed, and the data generated during this film removal process is fed back to the controller to update the preset heat shrinkage characteristic data table.

[0040] In this embodiment of the invention, a visual inspection device is introduced to quantitatively calculate the residual film area at the bottle opening after film removal and compare it with a preset qualified threshold. This solves the technical problems in the prior art where the film-cutting effect cannot be quantitatively verified and where automatic diversion and compensation for defective products are lacking. Specifically, the controller triggers the visual inspection device to acquire the final image of the bottle opening and calculates the residual film area using an image analysis algorithm. If the residual film area is less than the qualified threshold, a qualified signal is output and the bottle is released to the next station. If the residual film area exceeds the qualified threshold, a compensation film removal strategy is executed, and the parameters and effect data of this film removal process are fed back to the controller to update the heat shrinkage characteristic data table. Through this closed-loop verification and feedback mechanism, this invention achieves for the first time intelligent control in the bottled water film-cutting process, enabling quantifiable quality, automatic compensation for defects, and self-optimization of parameters, fundamentally solving the quality control blind spot of the "black box operation" in the film-cutting process.

[0041] In step 5, a compensation-based film removal strategy is implemented, which specifically includes the following steps: When the residual film area exceeds the preset qualified threshold, it is determined whether the residual film area exceeds the preset physical compensation upper limit threshold. If the residual film area exceeds the preset physical compensation upper limit threshold, the controller determines that the current barrel has lost its compensation significance, generates a forced rejection command, and diverts the barrel to the abnormal processing channel. If the residual film area does not exceed the preset physical remedy upper limit threshold, the parameter correction deviation value between the cooling rate parameter and the endpoint temperature parameter in the cryogenic control command is calculated based on the residual film area and the parameter records in the cryogenic control command, and a cryogenic parameter incremental dataset is generated. Based on the parameters in the cryogenic parameter incremental dataset, the cooling rate parameters and endpoint temperature parameters corresponding to the membrane material identification results in the preset heat shrinkage characteristic data table are updated by weighted moving average to generate an updated heat shrinkage characteristic data table. The updated heat shrinkage characteristic data table is then used as the detection of the next barrel. The updated heat shrinkage characteristic data table is combined with the cooling rate parameters and endpoint temperature parameters corresponding to the membrane material identification results. The residual membrane area and residual membrane location distribution of the current barrel are combined to generate secondary cryogenic parameters. The cryogenic medium injection device is controlled to perform secondary cryogenic treatment on the residual membrane of the current barrel with the secondary cryogenic parameters, and a secondary cryogenic treatment completion signal is generated. Upon receiving the signal indicating completion of the secondary cryogenic treatment, the auxiliary film removal mechanism is triggered to remove the loosened residual film from the barrel opening using a standard peeling force. The vision inspection device is then triggered to acquire the barrel opening image for the third time to verify whether the residual film area is less than the preset qualified threshold. If the verification is successful, the controller outputs a qualified signal and transports the current barrel to the next workstation. If the verification still fails, the controller outputs a forced rejection signal and diverts the current barrel to the abnormal processing channel.

[0042] In this embodiment of the invention, a progressive compensation strategy involving graded judgment, incremental parameter calculation, weighted moving average data table update, secondary cryogenic treatment, and third visual verification solves the technical problems of traditional compensation schemes that simply retry, cannot learn from failures, and may damage the barrel due to over-processing. Specifically, it first determines whether the residual film area exceeds the physical remediation upper limit threshold. If it does, it is directly and forcibly removed to avoid ineffective processing. If it does not exceed the threshold, the cryogenic parameter correction deviation value is calculated based on the residual film area and historical parameter records to generate a cryogenic parameter incremental dataset. Then, a weighted moving average is performed to update the cooling rate and endpoint temperature parameters of the corresponding material in the heat shrinkage characteristic data table, so that the updated data table can be used to optimize the processing of the next barrel. At the same time, the updated parameters are combined with the residual film position distribution of the current barrel to generate secondary cryogenic parameters. Lightweight secondary cryogenic treatment is performed on the residual film, and then the residual film is removed with standard peel force. Finally, the effect is confirmed by a third visual verification. This strategy transforms the failure experience of the current bins into optimization parameters for subsequent bins, achieving a "the more it is used, the smarter it becomes" group self-learning ability. At the same time, it saves most of the defective bins through secondary processing, significantly reducing the scrap rate of the entire production line.

[0043] To verify the difference in film removal effect between the present invention and existing hot air cutting technology, comparative experiments were conducted on the film removal effects of hot air cutting and the cryogenic treatment of the present invention.

[0044] The experiment used 30 samples each of POF, PVC, and PET barrel opening packaging films, totaling 90 samples. The samples were randomly grouped and subjected to film removal treatment under different temperature conditions. Each temperature point was tested three times independently, and the average value was taken as the final result. The hot air cutting experiment had a fixed wind speed of 2.0 m / s and a processing time of 3.5 seconds. The cryogenic treatment experiment used a liquid nitrogen-cooled cryogenic medium spray device with a cooling rate of 10℃ / min. After reaching the target temperature, the temperature was maintained for 30 seconds, then spraying was stopped and the container was left to stand for 15 seconds. After film removal, a visual inspection system was used to measure the residual film area, and the film removal success rate, barrel opening scratch rate, and fragmentation rate were statistically analyzed. The results are shown in Tables 1 and 2 below. Table 1: Film removal effect of hot air cutting in the temperature range of 80℃ to 140℃

[0045] Table 2: Film removal effect of the present invention at various temperatures

[0046] Please refer to Table 1 and Figure 2When the processing temperature is 80℃, the film removal success rate is 87.6%, the average residual film area is 8.7 mm², the barrel rim scratch rate is 3.2%, and the fragmentation rate is 4.7%. When the temperature rises to 100℃, the film removal success rate increases to 93.2%, the average residual film area decreases to 6.8 mm², the barrel rim scratch rate decreases to 2.3%, and the fragmentation rate is 4.2%, representing the optimal operating condition for this technical route. When the temperature continues to rise to 120℃, the film removal success rate drops back to 91.5%, the average residual film area rises back to 7.3 mm², the barrel rim scratch rate is 3.1%, and the fragmentation rate rises to 5.3%. When the temperature reaches 140℃, the film removal success rate further decreases to 86.8%, the average residual film area increases to 8.3 mm², the barrel rim scratch rate is 3.6%, and the fragmentation rate rises to 6.4%. The above data shows that the success rate of hot air film removal first increases and then decreases with temperature, with an optimal working window around 100℃. The removal effect decreases when the temperature deviates from this range. Meanwhile, the scratch rate at the barrel opening remains between 2.3% and 3.6% at all temperatures, while the fragmentation rate increases from 4.7% to 6.4% with increasing temperature, indicating that the packaging film is more prone to fragmentation due to excessive shrinkage under high-temperature conditions.

[0047] Please refer to Table 2 and Figure 3 At room temperature (25℃), the membrane removal success rate was 94.8%, the average residual membrane area was 4.3 mm², and the fragmentation rate was 0.4%. As the processing temperature gradually decreased, the membrane removal success rate showed a continuous upward trend: it rose to 95.7% at 15℃, and the residual membrane area decreased to 3.8 mm²; at 5℃, it was 96.3%, and the residual membrane area decreased to 3.3 mm²; at -5℃, it was 96.9%, and the residual membrane area decreased to 2.9 mm²; at -15℃, it was 97.6%, and the residual membrane area decreased to 2.4 mm²; at -25℃, it was 98.2%, and the residual membrane area decreased to 1.9 mm²; at -35℃, it was 98.4%, and the residual membrane area decreased to 1.4 mm²; when the temperature dropped to -40℃, the membrane removal success rate reached 98.7%, and the average residual membrane area was only 1.1 mm². Throughout the entire test temperature range, the scratch rate at the barrel rim was 0%; the fragmentation rate was 0.4%, 0.2%, and 0.1% at 25℃, 15℃, and 5℃, respectively, and completely decreased to 0% at -5℃ and below. These data indicate that the success rate of film removal through cryogenic treatment in this invention monotonically increases with decreasing temperature, reaching its optimal effect at -40℃. Furthermore, no barrel rim scratches occurred throughout the entire test temperature range, and the fragmentation rate was completely eliminated below -5℃.

[0048] The present invention also summarizes the comprehensive performance comparison data of the optimal working condition of hot air cutting film (100℃) and the optimal working condition of the present invention (-40℃), as shown in Table 3 below; Table 3: Comparison of comprehensive performance between the optimal operating condition (100℃) and the optimal operating condition (-40℃) of this invention for hot air cutting film.

[0049] As shown in Table 3, in terms of film removal success rate, hot air cutting achieves 93.2%, while this invention achieves 98.7%, representing an improvement of 5.5 percentage points. Regarding the average residual film area, hot air cutting results in 6.8 mm², while this invention achieves 1.1 mm², a reduction of 83.8%. In terms of barrel rim scratch rate, hot air cutting results in 2.3%, while this invention achieves 0%, completely eliminating the problem. Regarding fragmentation rate, hot air cutting results in 4.2%, while this invention achieves 0%, also completely eliminating the problem. These comparative data demonstrate that this invention outperforms hot air cutting technology in all aspects, including film removal success rate, residual film area, barrel rim scratch rate, and fragmentation rate.

[0050] Please see Figure 4 This embodiment provides an automatic film-cutting control system for bottled mineral water, the system comprising: The barrel positioning and material recognition module is used for: The bottled mineral water barrels are conveyed to the film cutting station. The positioning sensor detects the barrel's arrival signal and fixes the barrel, generating a positioning signal. Based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result. The cryogenic parameter decision module is used for: The controller receives the membrane material identification result, retrieves the corresponding heat shrinkage characteristic data from the preset heat shrinkage characteristic data table, and calculates the cryogenic treatment parameters based on the heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the barrel, to generate cryogenic control commands. Cryogenic actuation and membrane loosening triggering module, used for: The controller sends the cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the barrel opening, causing the PC barrel and the packaging film to undergo asynchronous dimensional changes due to the difference in thermal shrinkage rate, until the packaging film changes from a tightly adhered state to a loose state, generating a film loosening state signal. The auxiliary membrane removal and waste membrane collection module is used for: After receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loose packaging film from the barrel opening with peeling force, and at the same time starts the negative pressure adsorption device to collect the removed waste film and generates a film removal completion signal. The visual verification and compensation control module is used for: After receiving the film removal completion signal, the controller triggers the vision detection device to acquire the final image of the barrel opening. The controller calculates the residual film area of ​​the final image using an image analysis algorithm and compares the residual film area with a preset qualified threshold. If the residual film area is less than the preset qualified threshold, a qualified signal is output. If the residual film area exceeds the preset qualified threshold, a compensation film removal strategy is executed, and the data generated during this film removal process is fed back to the controller to update the preset heat shrinkage characteristic data table.

[0051] It should be understood that although the steps in the flowcharts of the various embodiments of the present invention are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the various embodiments may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps.

[0052] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for automatically controlling the film cutting of bottled mineral water, characterized in that, The method includes the following steps: Step 1: The bottled mineral water barrel is conveyed to the film cutting station. The positioning sensor detects the barrel's arrival signal and fixes the barrel, generating a positioning signal. Based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result. Step 2: The controller receives the membrane material identification result, queries the preset heat shrinkage characteristic data table to obtain the heat shrinkage characteristic data corresponding to the membrane material identification result; based on the heat shrinkage characteristic data, and combined with the current ambient temperature and the initial temperature of the barrel, it calculates the cryogenic treatment parameters to generate cryogenic control commands. Step 3: The controller sends the cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the mouth of the barrel, so that the PC barrel and the packaging film undergo asynchronous dimensional changes due to the difference in thermal shrinkage rate, until the packaging film changes from a tightly attached state to a loose state, generating a film loosening state signal. Step 4: After receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loose packaging film from the barrel opening with peeling force. At the same time, the negative pressure adsorption device is activated to collect the removed waste film and generate a film removal completion signal. Step 5: After receiving the film removal completion signal, the controller triggers the vision detection device to acquire the final image of the bucket opening, calculates the residual film area of ​​the final image through the image analysis algorithm, and compares the residual film area with the preset qualified threshold. If the residual film area is less than the preset qualified threshold, a qualified signal is output. If the residual film area exceeds the preset qualified threshold, a compensation film removal strategy is executed, and the data generated during this film removal process is fed back to the controller to update the preset heat shrinkage characteristic data table.

2. The automatic film cutting control method for bottled mineral water according to claim 1, characterized in that, In step 1, based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result. Specifically, this includes the following steps: The controller receives the positioning signal, generates a sensor start command based on the positioning signal, and sends the sensor start command to the identification sensor to generate an identification sensor ready status signal. In response to the readiness status signal of the identification sensor, the controller controls the identification sensor to emit near-infrared detection light toward the packaging film at the mouth of the barrel, and receives the spectral signal reflected or transmitted back by the packaging film to generate raw spectral signal data. The original spectral signal data is subjected to analog-to-digital conversion, and then digital filtering is performed to remove environmental noise interference and generate a preprocessed digital spectral signal. The controller is used to extract features from the preprocessed digital spectral signal, extracting the absorption peak positions and absorption intensity parameters of the packaging film within the preset characteristic wavelength range, and generating the spectral feature vector of the packaging film. The spectral feature vector of the packaging film is compared with the standard spectral feature vector stored in the pre-set material feature data table. The similarity between the spectral feature vector and the standard spectral feature vector of each material is calculated, and the similarity comparison result is generated. Based on the similarity comparison results, the material type with the highest similarity is selected to generate the membrane material identification result.

3. The automatic film cutting control method for bottled mineral water according to claim 2, characterized in that, In step 2, based on the heat shrinkage characteristic data and combined with the current ambient temperature and the initial temperature of the barrel, the cryogenic treatment parameters are calculated to generate cryogenic control commands. This specifically includes the following steps: The controller receives the thermal shrinkage characteristic data corresponding to the membrane material identification result, and at the same time obtains the current ambient temperature and the initial temperature of the barrel to generate the input dataset required for the calculation of cryogenic parameters. Based on the heat shrinkage rate in the heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the barrel, the initial value of the cooling rate is calculated according to the preset cooling rate mapping relationship, and the cooling rate reference parameter is generated. Based on the lower limit of the embrittlement temperature and the initial temperature of the barrel in the heat shrinkage characteristic data, combined with the heat exchange characteristics of the cryogenic treatment medium, the initial value of the endpoint temperature is calculated, and the endpoint temperature reference parameter is generated. Safety verification was performed on the cooling rate reference parameter and the endpoint temperature reference parameter to verify whether the cooling rate reference parameter was lower than the stress bearing threshold of the PC barrel and whether the endpoint temperature reference parameter was higher than the low temperature embrittlement temperature of the PC barrel, so as to generate the safety verification results of the cryogenic treatment parameters. If the cryogenic treatment parameter safety verification result is passed, the cryogenic control command is generated by using the cooling rate reference parameter and the endpoint temperature reference parameter as the cryogenic treatment parameters. If the cryogenic treatment parameter safety verification result is failed, the parameter correction process is triggered, the cooling rate corresponding to the cooling rate reference parameter and the endpoint temperature corresponding to the endpoint temperature reference parameter are adjusted to within the safety threshold range, the corrected cryogenic control command is generated, and the corrected cryogenic control command is output as the cryogenic control command.

4. The automatic film cutting control method for bottled mineral water according to claim 3, characterized in that, The parameter correction process is triggered, adjusting the cooling rate corresponding to the cooling rate reference parameter and the endpoint temperature corresponding to the endpoint temperature reference parameter to within a safe threshold range. The corrected cryogenic control command is then encapsulated and generated, and output as the corrected cryogenic control command. The specific steps include the following: S201. Extract the excess cooling rate and excess endpoint temperature from the safety verification results of cryogenic treatment parameters to generate a parameter correction dataset. S202. Compare the cooling rate excess in the parameter correction dataset with the preset cooling rate safety margin value to obtain a first comparison result. Calculate the cooling rate correction coefficient based on the first comparison result and multiply the cooling rate reference parameter by the cooling rate correction coefficient to generate the corrected cooling rate value. S203. Compare the endpoint temperature excess in the parameter correction dataset with the preset endpoint temperature safety margin value to obtain a second comparison result. Calculate the endpoint temperature correction coefficient based on the second comparison result and add the endpoint temperature reference parameter to generate the corrected endpoint temperature value. S204. Perform secondary verification on the corrected cooling rate value and the corrected endpoint temperature value to generate secondary safety verification results; S205. If the secondary safety verification result is passed, the corrected cooling rate value and the corrected endpoint temperature value are output as cryogenic control commands. If the secondary safety verification result is failed, steps S201 to S204 are repeated until the secondary safety verification result is passed or the preset maximum number of corrections is reached. The final corrected cooling rate value and the final corrected endpoint temperature value are then output as cryogenic control commands.

5. The automatic film cutting control method for bottled mineral water according to claim 4, characterized in that, In step 3, the controller sends a cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the barrel opening. This causes asynchronous dimensional changes between the PC barrel and the packaging film due to differences in thermal shrinkage rates, until the packaging film changes from a tightly adhered state to a loose state, generating a film loosening state signal. The specific steps include the following: S301. The controller receives the cryogenic control command, extracts the cooling rate parameter and the endpoint temperature parameter from the cryogenic control command, and generates a cryogenic execution parameter set. S302. Send the cryogenic execution parameter set to the control valve of the cryogenic medium injection device to trigger the cryogenic medium injection device to start the pre-injection self-test process and generate a cryogenic medium injection device ready status signal. S303. After receiving the ready status signal of the cryogenic medium injection device, calculate the instantaneous injection flow rate of the cryogenic medium according to the cooling rate parameter in the cryogenic execution parameter set and the preset injection flow rate mapping relationship, and generate the injection flow rate control command. S304. Send the injection flow control command to the flow regulating valve of the cryogenic medium injection device to control the cryogenic medium to be injected onto the surface of the packaging film at the barrel opening at the instantaneous injection flow rate, enter the cryogenic treatment stage, and start the timer to record the injection duration and generate a cryogenic treatment in progress status signal. S305. After the cryogenic treatment in progress status signal is triggered, the cryogenic treatment stage is entered. According to the preset time sampling interval, the surface temperature of the packaging film is collected in real time by the temperature sensor arranged on the surface of the packaging film at the mouth of the barrel, and a real-time surface temperature data sequence is generated. S306. Compare the current temperature value in the real-time surface temperature data sequence with the endpoint temperature parameter in the cryogenic execution parameter set. If the current temperature value is higher than the endpoint temperature parameter, the controller returns to S304 and adjusts the instantaneous injection flow rate and continues to perform the cryogenic process. If the current temperature value is lower than or equal to the endpoint temperature parameter, the controller executes the safe and controlled cryogenic process and generates a safe and controlled cryogenic process completion signal. S307. After receiving the signal that the safe and controlled cryogenic treatment is completed, the controller triggers the film loosening detection sensor to detect changes in the adhesion between the packaging film and the surface of the barrel opening. When the packaging film changes from a tightly adhered state to a partially lifted or overall loose state, a film loosening state signal is generated.

6. The automatic film cutting control method for bottled mineral water according to claim 5, characterized in that, The controller executes the safe and controlled cryogenic treatment process and generates a safe and controlled cryogenic treatment completion signal, which specifically includes the following steps: S3061. When the current temperature value is lower than or equal to the endpoint temperature parameter, switch the cryogenic medium injection device to the heat preservation mode, and spray the cryogenic medium onto the surface of the packaging film at the barrel opening with a maintenance injection flow rate lower than the initial injection flow rate, and generate a maintenance injection flow rate control command. S3062. The injection flow control command is sent to the flow regulating valve of the cryogenic medium injection device to control the cryogenic medium to maintain the injection flow for a preset heat preservation time, and the surface temperature of the packaging film is continuously monitored by a temperature sensor during the heat preservation time to generate temperature monitoring data for the heat preservation stage. S3063. Based on the temperature monitoring data during the heat preservation stage, determine whether the surface temperature of the packaging film is stable within the preset fluctuation tolerance range of the endpoint temperature parameter. If it exceeds the preset fluctuation tolerance range of the endpoint temperature parameter, adjust the maintenance spray flow rate to perform temperature compensation, generate a temperature compensation control record, store the temperature compensation control record in the controller, and return to step S3062 to re-execute. If the temperature fluctuation is within the preset tolerance range of the endpoint temperature parameter, the cryogenic medium injection device is controlled to stop injection, and a cryogenic medium injection stop signal is generated. S3064. After receiving the cryogenic medium injection stop signal, the controller triggers the timer and records the waiting time after the cryogenic medium injection stops. At the same time, it collects the surface temperature rise data of the packaging film during the waiting process to generate temperature change curve data of the waiting stage. S3065. Based on the temperature change curve data during the static waiting period, calculate the static waiting time required for the packaging film to reach the preset film loosening detection trigger temperature, and generate a static waiting time calculation value; when the actual static waiting time reaches the static waiting time calculation value, obtain a signal indicating that the safe and controlled cryogenic treatment is complete.

7. The automatic film cutting control method for bottled mineral water according to claim 6, characterized in that, In step 4, after receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loosened packaging film from the barrel opening with peeling force. At the same time, the negative pressure adsorption device is activated to collect the removed waste film and generate a film removal completion signal. The specific steps include the following: The controller receives the membrane loosening status signal and generates an auxiliary membrane removal start command. The auxiliary membrane removal start command is sent to the controller port of the auxiliary membrane removal mechanism, generating an auxiliary membrane removal mechanism ready status signal. After the auxiliary film removal mechanism is ready, the corresponding peel force amplitude parameter and peel angle parameter are queried from the preset peel force parameter table according to the film material identification result to generate the peel force execution parameter set; The execution parameters in the peel force execution parameter set are sent to the execution unit of the auxiliary film removal mechanism. The auxiliary film removal mechanism is controlled to apply a directional peel force to the packaging film that is already in a loose state with the peel force amplitude and peel angle in the peel force execution parameter set, so that the packaging film is removed from the edge of the barrel as a whole, and a film removal status signal is generated. While applying directional peeling force to the already loose packaging film, a negative pressure adsorption synchronous start command is generated and sent to the vacuum pump control port of the negative pressure adsorption device to control the negative pressure adsorption device to start negative pressure suction and generate a negative pressure adsorption device running status signal. After receiving the membrane removal status signal and the negative pressure adsorption device operation status signal, the controller triggers the position sensor at the inlet of the waste film collection box to detect whether the removed packaging film has fallen into the waste film collection box and generates a waste film collection confirmation signal. After receiving the waste film collection confirmation signal, the controller sends the film removal completion signal to the conveying device controller, which then controls the conveying device to move the barrel out of the film cutting station and generate the film removal completion signal.

8. The automatic film cutting control method for bottled mineral water according to claim 7, characterized in that, In step 5, a compensation film removal strategy is implemented, which specifically includes the following steps: When the residual film area exceeds the preset qualified threshold, it is determined whether the residual film area exceeds the preset physical compensation upper limit threshold. If the residual film area exceeds the preset physical compensation upper limit threshold, the controller determines that the current barrel has lost its compensation significance, generates a forced rejection command, and diverts the barrel to the abnormal processing channel. If the residual film area does not exceed the preset physical remedy upper limit threshold, the parameter correction deviation value between the cooling rate parameter and the endpoint temperature parameter in the cryogenic control command is calculated based on the residual film area and the parameter records in the cryogenic control command, and a cryogenic parameter incremental dataset is generated. Based on the parameters in the cryogenic parameter incremental dataset, the cooling rate parameters and endpoint temperature parameters corresponding to the membrane material identification results in the preset heat shrinkage characteristic data table are updated by weighted moving average to generate an updated heat shrinkage characteristic data table. The updated heat shrinkage characteristic data table is then used as the detection of the next barrel. The updated heat shrinkage characteristic data table is combined with the cooling rate parameters and endpoint temperature parameters corresponding to the membrane material identification results. The residual membrane area and residual membrane location distribution of the current barrel are combined to generate secondary cryogenic parameters. The cryogenic medium injection device is controlled to perform secondary cryogenic treatment on the residual membrane of the current barrel with the secondary cryogenic parameters, and a secondary cryogenic treatment completion signal is generated. Upon receiving the signal indicating completion of the secondary cryogenic treatment, the auxiliary film removal mechanism is triggered to remove the loosened residual film from the barrel opening using a standard peeling force. The vision inspection device is then triggered to acquire the barrel opening image for the third time to verify whether the residual film area is less than the preset qualified threshold. If the verification is successful, the controller outputs a qualified signal and transports the current barrel to the next workstation. If the verification still fails, the controller outputs a forced rejection signal and diverts the current barrel to the abnormal processing channel.

9. An automatic film-cutting control system for bottled mineral water, characterized in that, The system employs the automatic film-cutting control method for bottled mineral water as described in any one of claims 1-8, and the system comprises: The barrel positioning and material recognition module is used for: The bottled mineral water barrels are conveyed to the film cutting station. The positioning sensor detects the barrel's arrival signal and fixes the barrel, generating a positioning signal. Based on the positioning signal, the identification sensor is triggered to collect the spectral feature information of the packaging film at the barrel opening, identify the material type of the packaging film, and generate a film material identification result. The cryogenic parameter decision module is used for: The controller receives the membrane material identification result, retrieves the corresponding heat shrinkage characteristic data from the preset heat shrinkage characteristic data table, and calculates the cryogenic treatment parameters based on the heat shrinkage characteristic data, combined with the current ambient temperature and the initial temperature of the barrel, to generate cryogenic control commands. Cryogenic actuation and membrane loosening triggering module, used for: The controller sends the cryogenic control command to the cryogenic medium injection device to perform cryogenic treatment on the packaging film at the barrel opening, causing the PC barrel and the packaging film to undergo asynchronous dimensional changes due to the difference in thermal shrinkage rate, until the packaging film changes from a tightly adhered state to a loose state, generating a film loosening state signal. The auxiliary membrane removal and waste membrane collection module is used for: After receiving the film loosening status signal, the controller triggers the auxiliary film removal mechanism to remove the loose packaging film from the barrel opening with peeling force, and at the same time starts the negative pressure adsorption device to collect the removed waste film and generates a film removal completion signal. The visual verification and compensation control module is used for: After receiving the film removal completion signal, the controller triggers the vision detection device to acquire the final image of the barrel opening. The controller calculates the residual film area of ​​the final image using an image analysis algorithm and compares the residual film area with a preset qualified threshold. If the residual film area is less than the preset qualified threshold, a qualified signal is output. If the residual film area exceeds the preset qualified threshold, a compensation film removal strategy is executed, and the data generated during this film removal process is fed back to the controller to update the preset heat shrinkage characteristic data table.

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