Automatic film blowing machine die gap adjustment system and method

Abstract

The present application belongs to the technical field of plastic film blowing, and provides a film blowing machine die gap automatic adjustment system and method. The system comprises a shooting device, a control device and a driving device. The shooting device is used for shooting video information of the film blowing machine die gap and a standard width plate, and transmitting the video information to the control device. The control device is used for receiving the video information, calculating the actual width of the die gap according to the standard line physical width of the standard width plate and the standard line pixel width and the die gap pixel width in the video information, determining the width difference between the actual width of the die gap and the target width of the die gap, generating and sending a screw control instruction of the film blowing machine die to the driving device according to the width difference. The driving device is used for performing a tightening or loosening torque operation on the adjusting screw at the corresponding position of the film blowing machine die after receiving the screw control instruction. The scheme improves the accuracy and efficiency of the die gap adjustment, and makes the die gap adjustment operation more convenient.

Description

Technical Field

[0001] This invention relates to the field of plastic blown film technology, and in particular to an automatic adjustment system and method for the die head gap of a blown film machine. Background Technology

[0002] As one of the core processes in plastic product manufacturing, the production efficiency and product quality of blown film technology directly depend on the operating precision of the blown film machine. As a core component of the blown film machine, the uniformity and accuracy of the gap size of the die head are important factors that determine key indicators such as film thickness consistency and flatness. Therefore, the precise adjustment of the die head gap has become a key process in plastic blown film production.

[0003] In related technologies, the adjustment of the die head gap of a blown film machine is generally done manually. Operators need to judge the actual size of the die head gap by visual observation or by using simple tools such as thickness gauges, and then manually tighten the adjusting screw at the die opening to change the die head gap size by adjusting the tightness of the screw. This traditional adjustment method has several technical drawbacks: First, visual observation is highly subjective, and the measurement accuracy of the thickness gauge is limited, resulting in low accuracy in judging and adjusting the die head gap. This makes it difficult to ensure the uniformity of the circumferential gap of the die head, leading to large thickness deviations in blown film products and affecting product quality. Second, the manual adjustment of screws is cumbersome, requiring repeated measurements and adjustments, consuming a lot of manpower and time, resulting in low adjustment efficiency and making it difficult to adapt to the fast pace of modern production. Third, when using a thickness gauge to check the die head gap, the gauge needs to directly contact the gap of the die head, which can easily cause physical damage such as scratches and bumps to the precision mating surfaces of the die head, affecting the service life of the die head and even further aggravating the error in gap adjustment. Fourth, the effectiveness of manual adjustment is highly dependent on the experience of the operator. Different operators have different operating techniques and judgment standards, resulting in poor consistency in die head gap adjustment and making it difficult to guarantee the stability of the production process.

[0004] It is evident that existing blown film machine die head gap adjustment schemes suffer from technical problems such as low control precision and efficiency, and insufficient automation. Summary of the Invention

[0005] This invention provides an automatic adjustment system and method for the die head gap of a blown film machine, which solves the defects of existing blown film machine die head gap adjustment schemes, such as low control accuracy and efficiency and insufficient automation.

[0006] On one hand, the present invention provides an automatic adjustment system for the die head gap of a blown film machine, comprising: a camera, a control device, and a drive device; The control device is connected to the shooting device and the driving device respectively, and the driving device is in contact with the adjusting screw at the corresponding position of the blown film die head; The shooting device is used to capture video information of the die head gap and standard width plate of the blown film machine, and transmit the video information to the control device; The control device is used to receive the video information, calculate the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, determine the width difference between the actual width of the die head gap and the preset target width of the die head gap, and generate and send the screw adjustment command of the blown film die head to the drive device based on the width difference. The drive device is used to tighten or loosen the adjusting screw at the corresponding position of the blown film die head after receiving the screw adjustment command.

[0007] According to the automatic adjustment system for the die head gap of a blown film machine provided by the present invention, the imaging device includes: an image acquisition device and a camera support frame; The image acquisition device is fixedly installed on the camera support frame, and the distance between the image acquisition device and the gap between the blown film machine die head being photographed and the standard width plate remains fixed.

[0008] According to the automatic adjustment system for the die head gap of the blown film machine provided by the present invention, the image acquisition device is any one of a high-definition camera, an infrared sensor, and an X-ray sensor.

[0009] According to the automatic adjustment system for die head gap of a blown film machine provided by the present invention, the control device includes: a data processor and a wireless communication module; The data processor is connected to the shooting device and the driving device respectively through the wireless communication module.

[0010] According to the automatic adjustment system for die head clearance of a blown film machine provided by the present invention, the control device further includes: a data display; The data display is used to display at least one of the following in real time: the video information, the actual width of the die head gap, and the screw adjustment command.

[0011] According to the automatic die head gap adjustment system for blown film machines provided by the present invention, the control device calculates the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, including: The width conversion ratio is obtained by dividing the physical width of the standard lines on the standard width board by the pixel width of the standard lines in the video information. The actual width of the head gap is calculated by multiplying the pixel width of the head gap in the video information by the width conversion ratio.

[0012] According to the automatic adjustment system for the die head gap of a blown film machine provided by the present invention, the control device generates screw adjustment instructions for the die head of the blown film machine based on the width difference, including: Based on the width difference, determine the number of screw adjustments and the screw adjustment direction of the blown film machine die head; The screw adjustment number and the screw adjustment direction are used as instruction content to generate a screw control command.

[0013] According to the automatic adjustment system for the die head gap of the blown film machine provided by the present invention, the preset target width of the die head gap is the average of the actual gap width at any point on the die head of the blown film machine and the actual gap width at the corresponding diaphragm point.

[0014] According to the automatic adjustment system for the die head gap of the blown film machine provided by the present invention, the driving device is an electric torque wrench. The wrench head of the electric torque wrench is adapted to the specifications of the adjusting screw at the corresponding position of the die head of the blown film machine, and is snapped or sleeved onto the nut part of the adjusting screw.

[0015] On the other hand, the present invention also provides an automatic adjustment method for the die head gap of a blown film machine, based on any of the above-described automatic adjustment system for the die head gap of a blown film machine, the method comprising: The video information of the die head gap and standard width plate of the blown film machine is captured by the shooting device and transmitted to the control device. The control device receives the video information, calculates the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, and determines the width difference between the actual width of the die head gap and the preset target width of the die head gap. Based on the width difference, the control device generates and sends the screw adjustment command of the blown film die head to the drive device. The drive device receives the screw adjustment command and performs torque operation to tighten or loosen the adjusting screw at the corresponding position of the blown film die head.

[0016] The automatic die head gap adjustment system and method for blown film machines provided by this invention achieves automated detection and precise adjustment of the die head gap through the coordinated operation of imaging equipment, control equipment, and drive equipment. Compared with traditional manual adjustment methods, it significantly improves the accuracy and efficiency of die head gap adjustment, effectively ensuring the uniformity of the circumferential gap of the die head, thereby improving the thickness consistency and overall quality of blown film products. It eliminates the need for manual contact with tools such as thickness gauges to detect the die head gap, avoiding the risk of scratches, bumps, and other damage to the precision surfaces of the die head, and extending the die head's service life. The entire process, from gap calculation and adjustment command generation to screw torque operation, is completed automatically by the equipment, reducing the subjectivity and experience dependence of manual operation, lowering labor costs, and making the die head gap adjustment operation simpler, thus better adapting to the high-efficiency and stable production needs of modern plastic blown film production. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the automatic die head gap adjustment system for a blown film machine provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the imaging device in an embodiment of the present invention; Figure 3 This is a schematic diagram of a standard width plate in an embodiment of the present invention; Figure 4 This is a flowchart illustrating the automatic adjustment method for the die head gap of a blown film machine provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] The following is combined Figures 1 to 4 This invention describes the detailed scheme of the automatic adjustment system and method for the die head gap of a blown film machine provided in the embodiments of the present invention.

[0021] like Figure 1As shown, the automatic adjustment system for the die head gap of the blown film machine provided in this embodiment of the invention mainly includes: a shooting device 110, a control device 120, and a driving device 130.

[0022] The control device 120 is connected to the shooting device 110 and the driving device 130 respectively, and the driving device 130 is in contact with the adjusting screw at the corresponding position of the blown film die head.

[0023] The camera device 110 is used to capture video information of the die head gap and standard width plate of the blown film machine, and transmit the video information to the control device 120.

[0024] The control device 120 is used to receive video information, calculate the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, and determine the width difference between the actual width of the die head gap and the preset target width of the die head gap. Based on the width difference, it generates and sends the screw adjustment command of the blown film die head to the drive device 130.

[0025] The drive device 130 is used to tighten or loosen the torque of the adjusting screw at the corresponding position of the blown film die head after receiving the screw adjustment command.

[0026] The automatic die head gap adjustment system for blown film machines provided in this embodiment is based on a camera, a control device, and a drive device. Through the coordinated operation of the three, it realizes the automatic detection and precise adjustment of the die head gap. The overall operation logic is an integrated process of visual acquisition, intelligent calculation, and power execution.

[0027] Among them, the shooting device 110 is responsible for visual information acquisition. It can capture video information of the gap between the blown film machine die head and the standard width plate and transmit it to the control device 120 to provide basic visual data for gap measurement.

[0028] As the core control unit of the system, the control device 120 is connected to the shooting device 110 and the driving device 130 respectively. First, based on the actual physical width of the standard line on the standard width board, combined with the pixel width of the standard line and the pixel width of the die head gap in the video information, the actual width of the die head gap is accurately calculated through the conversion relationship between pixels and actual size. Then, the actual width is compared with the preset target width of the die head gap to obtain the width difference. Based on the size and sign of the difference, the corresponding screw adjustment command is generated and sent to the driving device 130.

[0029] The drive device 130 acts as an actuator, contacting the adjusting screw at the corresponding position of the blown film die head. After receiving the screw adjustment command from the control device 120, it precisely executes the tightening or loosening torque operation of the adjusting screw, thereby achieving precise adjustment of the die head gap. The entire process does not require manual measurement and adjustment, and can complete the automated operation of the die head gap from detection to adjustment.

[0030] In one embodiment, such as Figure 2 As shown, the shooting equipment specifically includes: an image acquisition unit 210 and a camera support bracket 220.

[0031] The image acquisition device 210 is fixedly installed on the camera support frame 220, and the distance between the image acquisition device 210 and the gap between the blown film machine die head being photographed and the standard width plate remains fixed.

[0032] In practical applications, the image acquisition device can be any of the following: a high-definition camera, an infrared sensor, or an X-ray sensor.

[0033] In this embodiment, the shooting device consists of two main components: an image acquisition unit and a camera support frame. The two are a fixed assembly structure. The image acquisition unit 210 is stably mounted on the camera support frame 220. With the support and positioning function of the camera support frame 220, the shooting distance between the image acquisition unit 210 and the object being photographed (such as the gap of the blown film machine die head or a standard width plate) can be strictly guaranteed to remain constant. This fixed shooting distance is an important prerequisite for the subsequent accurate calculation of the actual width of the die head gap through pixel conversion. It can effectively avoid pixel ratio deviation caused by changes in shooting distance and ensure the accuracy of gap detection.

[0034] In practical applications, the selection of image acquisition devices is flexible and adaptable, and is not limited to a single type. Depending on the actual use scenario of the blown film machine, the detection accuracy requirements, and other actual needs, any one of high-definition cameras, infrared sensors, or X-ray sensors can be selected.

[0035] Different types of image acquisition devices can collect information related to die head gap and standard width plate through their respective detection principles, which can provide effective data support for the calculation and analysis of the subsequent control system, thereby adapting to the die head gap detection needs under different production conditions. Figure 3 An example is shown of the standard line distribution pattern of a standard width plate.

[0036] In one embodiment, the control device includes a data processor and a wireless communication module.

[0037] The data processor is connected to both the shooting device and the driving device via a wireless communication module.

[0038] In this embodiment, the control device consists of a core structure of a data processor and a wireless communication module. The two work together to realize the system's information processing, instruction generation, and wireless interaction functions. The data processor, as the computing core of the control device, establishes wireless connections with the shooting device and the driving device through the wireless communication module, breaking the limitations of physical wiring. It can receive video and data information related to the mold head gap and standard width plate collected and transmitted by the shooting device through the wireless communication module, providing a data foundation for subsequent calculation of the actual gap width, difference analysis, and generation of control instructions. It can also wirelessly send the generated control instructions such as tightening and loosening screws to the driving device through the wireless communication module, realizing precise remote control of the driving device's operation. This ensures the real-time performance and stability of data transmission and instruction interaction between the shooting, control, and driving devices.

[0039] In one embodiment, the control device may further include a data display.

[0040] The data display is used to display at least one of the following in real time: video information, actual width of the die head gap, and screw adjustment commands.

[0041] In this embodiment, in addition to the data processor and wireless communication module, the control device also includes a data display as an important component. The data display is specifically responsible for the real-time display of various core information of the system. It can simultaneously present at least one of the following three types of information: video information of the blown film machine die head gap and standard width plate transmitted by the shooting device, actual width value of the die head gap calculated by the data processor, and generated blown film machine die head screw adjustment instructions. It becomes a visual window for operators to intuitively grasp the system operating status, die head gap detection data and adjustment instructions, making up for the lack of information visualization in pure automatic control.

[0042] In practical applications, data displays can present various types of information in a segmented visual display manner, dividing the display interface into independent sections such as video acquisition area, data calculation area, and command issuance area.

[0043] The video capture area can project high-definition video footage transmitted by the camera in real time, clearly showing the actual state of the die head gap and the standard width plate; the data calculation area can accurately display the actual width of the gap at each detection position of the die head in the form of numbers and units, and can also mark the target gap width and the difference between the two; the command release area clearly displays the screw adjustment command in the form of text and symbols, including the position of the screw to be adjusted, the adjustment direction of tightening or loosening, and the specific number of turns. The information in each area can be updated synchronously and clearly divided, allowing operators to quickly read key information and monitor the automatic adjustment process of the system in real time through this interface.

[0044] In one embodiment, the control device calculates the actual width of the die head gap based on the physical width of the standard lines on the standard width plate, the pixel width of the standard lines in the video information, and the pixel width of the die head gap. Specifically, this includes: First, the physical width of the standard lines on the standard width board is divided by the pixel width of the standard lines in the video information to obtain the width conversion ratio.

[0045] In practical applications, a standard width plate can be placed within the acquisition field of the image acquisition device. A standard line with a known physical width on the standard width plate can be selected as the calibration reference. The two core parameters, the pixel width of the standard line and the pixel width of the gap between the mold heads, can be recorded and input into the control device.

[0046] Specifically, the physical width of the standard line can be set to L. 标 The unit is mm, which is a known fixed value. Any standard line of any specification can be selected from the standard width plate, such as 5mm, 10mm, etc. After the image acquisition device captures the standard line, the control device identifies the standard line's pixel width as P. 标 The unit is pixels.

[0047] Based on the positive correlation between actual width and pixel width, the actual physical width corresponding to a unit pixel can be calculated, i.e., the width conversion ratio K. The specific calculation formula is as follows: (1) It is understood that the width conversion ratio K in this embodiment is a fixed value. Since the distance between the image acquisition device and the subject remains unchanged, it can be reused after calibration.

[0048] Then, the actual width of the head gap is calculated by multiplying the pixel width of the head gap in the video information by the width conversion ratio.

[0049] In practical applications, the camera support bracket can be fixed to the top of the blown film machine die head, ensuring that the distance between the image acquisition device and the die head gap is consistent with the distance at the calibrated width conversion ratio K. The image acquisition device can capture the die head gap of the blown film machine, and the control equipment can then automatically identify the pixel width P of the die head gap. 隙 The width conversion ratio K and the pixel width of the die head gap P are converted. 隙 Substituting into the following formula, the actual width L of the die head clearance can be calculated. 隙 The formula is: (2) In one embodiment, the control device generates screw adjustment instructions for the blown film die head based on the width difference, specifically including: First, based on the width difference, determine the number of screw adjustments and the direction of screw adjustment for the blown film die head.

[0050] In this embodiment, the number of screw adjustments and the adjustment direction can be determined based on the difference between the actual width of the die head gap and the preset target width of the die head gap, combined with the adjustment characteristics of the die head adjustment screw of the blown film machine, namely, that the die head gap narrows by 1 mm for every turn the adjustment screw is tightened and widens by 1 mm for every turn the adjustment screw is loosened.

[0051] When the width difference is positive, it indicates that the actual width of the die head gap is greater than the preset target gap, and the gap needs to be reduced. The adjustment direction is tightening, and the number of screw adjustments is the absolute value of the width difference. When the width difference is negative, it indicates that the actual width of the die head gap is less than the preset target width of the die head gap, and the gap needs to be widened. The adjustment direction is loosening, and the number of screw adjustments is the absolute value of the width difference. When the width difference is zero, it indicates that the actual width of the die head gap is the same as the preset target width of the die head gap, and no screw adjustment is required. There are no relevant judgment results regarding the number of adjustments or the adjustment direction.

[0052] In this embodiment, the preset target width of the film head gap is the average of the actual gap width at any point on the blown film die head and the actual gap width at the corresponding diaphragm point.

[0053] In this embodiment, the target width of the die head gap is calculated by selecting the actual gap width of any detection point on the die head of the blown film machine, and then matching the actual gap width of the corresponding diaphragm point on the annular structure of the die head. The die head gap width values ​​of the two points are summed and the average value is taken. This average value is the target width of the die head gap that is common to the detection point and the corresponding diaphragm point. Adjusting the die head gap based on this can effectively ensure the uniformity of the gap in the circumferential direction of the die head and avoid the problem of die head gap imbalance caused by adjustment at a single point.

[0054] Then, the screw adjustment number and screw adjustment direction are used as the instruction content to generate a screw adjustment command.

[0055] In practical applications, after determining the number of screw adjustments and the adjustment direction, the screw adjustment command is generated based on the above two determination results as the core instruction content, combined with the screw position information of the blown film die head. The screw adjustment command will clearly mark the specific position of the screw to be adjusted at the die head, and clearly record the corresponding adjustment direction and precise number of adjustments for the screw at that position, forming a standardized and digital screw adjustment command. This ensures that the drive equipment can accurately identify the position of the screw to be operated and the specific adjustment action requirements based on the command, thereby providing a clear and specific instruction basis for the subsequent torque operation of the drive equipment.

[0056] In one embodiment, the driving device is an electric torque wrench. The wrench head of the electric torque wrench is adapted to the specifications of the adjusting screw at the corresponding position of the blown film die head, and is snapped or sleeved onto the nut part of the adjusting screw.

[0057] In this embodiment, the driving device uses an electric torque wrench. To achieve precise torque operation on the adjusting screw of the blown film machine die head, the wrench head of the electric torque wrench is designed to be compatible with the adjusting screw at the corresponding position of the blown film machine die head. The size and number of edges of the wrench head are matched with the nut of the adjusting screw. During operation, the wrench head can be directly engaged or sleeved on the nut of the adjusting screw to form a stable connection. This ensures that when the electric torque wrench performs torque operation of tightening or loosening, it can accurately fit with the adjusting screw and the force transmission is stable, avoiding slippage, misalignment, etc. This ensures that the adjustment action of the adjusting screw is executed accurately and efficiently, thereby providing a reliable power execution guarantee for the accurate adjustment of the die head gap.

[0058] Based on the same general inventive concept, this invention also protects an automatic adjustment method for the die head gap of a blown film machine. The automatic adjustment method for the die head gap of a blown film machine provided by this invention will be described below. The automatic adjustment method for the die head gap of a blown film machine described below can be referred to in correspondence with the automatic adjustment system for the die head gap of a blown film machine described above.

[0059] like Figure 4 As shown, the automatic die head gap adjustment method for blown film machines provided in this embodiment of the invention can be implemented based on the automatic die head gap adjustment system for blown film machines provided in the above embodiments. The method specifically includes the following steps: Step 310: Capture video information of the die head gap and standard width plate of the blown film machine using a camera and transmit the video information to the control device.

[0060] Step 320: Receive video information through the control device, calculate the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, and determine the width difference between the actual width of the die head gap and the preset target width of the die head gap. Based on the width difference, generate and send the screw adjustment command of the blown film die head to the drive device.

[0061] Step 330: Receive screw adjustment instructions through the drive device and perform torque operation to tighten or loosen the adjusting screws at the corresponding positions of the blown film die head.

[0062] The specific implementation of each step in the methods described in the above embodiments has been described in detail in the embodiments of the relevant systems, and will not be elaborated further here.

[0063] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic die head gap adjustment system for a blown film machine, characterized in that, include: Filming equipment, control equipment, and drive equipment; The control device is connected to the shooting device and the driving device respectively, and the driving device is in contact with the adjusting screw at the corresponding position of the blown film die head; The shooting device is used to capture video information of the die head gap and standard width plate of the blown film machine, and transmit the video information to the control device; The control device is used to receive the video information, calculate the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, determine the width difference between the actual width of the die head gap and the preset target width of the die head gap, and generate and send the screw adjustment command of the blown film die head to the drive device based on the width difference. The drive device is used to tighten or loosen the adjusting screw at the corresponding position of the blown film die head after receiving the screw adjustment command.

2. The automatic die head gap adjustment system for a blown film machine according to claim 1, characterized in that, The shooting equipment includes: an image acquisition device and a camera support frame; The image acquisition device is fixedly installed on the camera support frame, and the distance between the image acquisition device and the gap between the blown film machine die head being photographed and the standard width plate remains fixed.

3. The automatic die head gap adjustment system for a blown film machine according to claim 2, characterized in that, The image acquisition device can be any one of a high-definition camera, an infrared sensor, or an X-ray sensor.

4. The automatic die head gap adjustment system for a blown film machine according to claim 1, characterized in that, The control device includes: a data processor and a wireless communication module; The data processor is connected to the shooting device and the driving device respectively through the wireless communication module.

5. The automatic die head gap adjustment system for a blown film machine according to claim 4, characterized in that, The control device further includes: a data display; The data display is used to display at least one of the following in real time: the video information, the actual width of the die head gap, and the screw adjustment command.

6. The automatic die head gap adjustment system for a blown film machine according to claim 1, characterized in that, The control device calculates the actual width of the die head gap based on the physical width of the standard lines on the standard width board, the pixel width of the standard lines in the video information, and the pixel width of the die head gap, including: The width conversion ratio is obtained by dividing the physical width of the standard lines on the standard width board by the pixel width of the standard lines in the video information. The actual width of the head gap is calculated by multiplying the pixel width of the head gap in the video information by the width conversion ratio.

7. The automatic die head gap adjustment system for a blown film machine according to claim 1, characterized in that, The control device generates screw adjustment instructions for the blown film die head based on the width difference, including: Based on the width difference, determine the number of screw adjustments and the screw adjustment direction of the blown film machine die head; The screw adjustment number and the screw adjustment direction are used as instruction content to generate a screw control command.

8. The automatic die head gap adjustment system for a blown film machine according to any one of claims 1 to 7, characterized in that, The preset target width of the film head gap is the average of the actual gap width at any point on the blown film die head and the actual gap width at the corresponding diaphragm point.

9. The automatic die head gap adjustment system for a blown film machine according to claim 1, characterized in that, The driving device is an electric torque wrench. The wrench head of the electric torque wrench is adapted to the specifications of the adjusting screw at the corresponding position of the blown film die head, and is snapped or sleeved onto the nut part of the adjusting screw.

10. A method for automatically adjusting the die head gap of a blown film machine, characterized in that, Based on the automatic die head gap adjustment system of the blown film machine as described in any one of claims 1 to 9, the method includes: The video information of the die head gap and standard width plate of the blown film machine is captured by the shooting device and transmitted to the control device. The control device receives the video information, calculates the actual width of the die head gap based on the physical width of the standard lines of the standard width plate and the pixel width of the standard lines and the pixel width of the die head gap in the video information, and determines the width difference between the actual width of the die head gap and the preset target width of the die head gap. Based on the width difference, the control device generates and sends the screw adjustment command of the blown film die head to the drive device. The drive device receives the screw adjustment command and performs torque operation to tighten or loosen the adjusting screw at the corresponding position of the blown film die head.

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