Defect detecting and slitting mechanism and method for polypropylene film for capacitor

Abstract

The invention relates to the technical field of polypropylene film splitting and cutting detection, in particular to a capacitor polypropylene film defect detecting and slitting mechanism which comprises a first rack, a second rack, a control case and a slitting assembly. A detection probe and detection equipment matched with the detection probe for use are arranged outside the cutter; the detection device comprises a machine shell, a detection assembly and a second guide plate, wherein the machine shell is arranged outside the cutter in a sleeving mode and is hollow, and the detection assembly and the second guide plate are used in the machine shell in a matched mode. The detection assembly comprises a concave seat and two side plates arranged in the concave seat; according to the defect detecting and slitting mechanism and method for the polypropylene film for the capacitor, the state of the cutter can be optimized in a targeted mode according to the characteristics of films of different specifications through multi-stage cleaning testing, and for the thin film, the cutter needs to be sharper and the surface is smooth, so that pulling and deformation during cutting are reduced, and the testing flexibility of the film is improved.

Description

Technical Field

[0001] This application relates to the field of polypropylene film cutting and inspection technology, and in particular to a defect detection and cutting mechanism and method for polypropylene film used in capacitors. Background Technology

[0002] Polypropylene film is a crucial dielectric material for capacitors, and its quality after slitting directly determines the electrical performance and reliability of the capacitor. Defects such as edge burrs, uneven thickness, and surface scratches generated during the film slitting process can severely affect the capacitor's withstand voltage, loss tangent, and long-term stability. Therefore, high-precision inspection and control of the film cutting process is a key step in achieving high-performance capacitor production. In the slitting production of polypropylene film for capacitors, current film quality assessment relies heavily on detection probes, visual inspection by operators, manual cleaning, or blade replacement. This approach is inefficient and inconsistent, resulting in a general lack of evaluation of the cutting blade's working condition and film cutting performance in existing slitting equipment. Since the cutting blade is the core tool in the slitting process, its sharpness, cleanliness, and surface microstructure directly determine the physical characteristics of the film's cutting interface. However, existing technologies cannot perform in-situ, quantitative detection of these properties, forcing blade maintenance to be based on fixed time intervals or experience-based judgment. This carries the risk of over-maintenance or under-maintenance and fails to meet the differentiated requirements of cutting and inspecting different specifications of film materials. Therefore, this paper proposes a defect detection and slitting mechanism for polypropylene film for capacitors to address the aforementioned problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies and improve the testing results of thin films, this application provides a defect detection and slitting mechanism for polypropylene films used in capacitors. This mechanism features multi-level testing and the ability to slit films according to the characteristics of different specifications, thus solving the problems mentioned above.

[0004] This application provides a defect detection and slitting mechanism for polypropylene film used in capacitors, employing the following technical solution: A defect detection and slitting mechanism for polypropylene film used in capacitors includes a frame 1, a frame 2, a control box, and a slitting assembly. The slitting assembly includes a cutter and a cutter shaft. A detection probe and a detection device used in conjunction with the detection probe are provided on the outside of the cutter. The detection device includes a housing that is sleeved outside the cutter and has a hollow interior, a detection component and a second guide plate that are used in conjunction inside the housing; the detection component includes a concave seat, two side plates disposed inside the concave seat, and a top plate disposed above the concave seat, wherein a plurality of bristles and two pressure friction blocks are disposed between the two side plates, and each side plate is provided with an abutment member that cooperates with the second guide plate; The abutting component includes a guide shaft, a first ball bearing rotatably mounted on one end of the guide shaft, and a first return spring fixed to the outer surface of the guide shaft. One end of the guide shaft is fixed to the outer wall of one of the side plates, and the two side plates move relatively synchronously through the abutting engagement of the abutting component with the second guide plate. The second guide plate includes a plate body, on which a first guide surface, a second guide surface, and a third guide surface are provided from low to high, wherein a transition surface is provided between two adjacent surfaces.

[0005] Optionally: the second frame is welded to the top side of the first frame; the control box is bolted to one side of the first frame; the inner side of the second frame is provided with a smoothing component and a distributing roller for use with the slitting component; and a conveying roller is also installed on the other side of the second frame. Optionally: The inner side of the frame two is bolted with a probe mounting plate, and there are multiple detection probes, which are fixed to the probe mounting plate in pairs at equal intervals.

[0006] Optionally, the detection assembly further includes a lifting shaft fixed to the lower surface of the top plate, the bottom end of the lifting shaft extending into the interior of the concave seat, wherein connecting rods are hinged between the opposite sides of the two side plates and the two sides of the bottom end of the lifting shaft, and the shape of the top plate is adapted to the top side of the housing.

[0007] Optionally: The housing has a sliding opening inside, and the detection device also includes a drive assembly, a pressurization assembly and a dripping structure. A swing arm is provided between the drive assembly and the concave seat, and one side of the swing arm extends through the sliding opening into the housing and is fixed to the outer wall of the concave seat.

[0008] Optional: The drive assembly includes a drive motor and three transmission gears. A rotating seat with a swing arm is fixed to the outer wall of the left transmission gear, and the right transmission gear is fixed to the output shaft of the drive motor. The three transmission gears mesh with each other and drive the detection assembly to move through the swing arm.

[0009] Optionally: The booster assembly is mounted on the outer wall of the swing arm and moves with the swing arm. The booster assembly includes a booster cylinder fixed to the outer wall of the swing arm, a first piston slidably disposed inside the booster cylinder, a check valve fixed to the outer wall of the booster cylinder, and a nozzle fixed to one side of the concave seat. The check valve is connected to the nozzle, the first piston extends to the outside of the booster cylinder, and a roller is rotatably mounted on the bottom end of the first piston.

[0010] Optionally: A first guide plate with a wave-shaped shape is fixed on the outer wall of the housing, the roller abuts against the outer surface of the first guide plate, and a second return spring is installed on the outside of the first piston.

[0011] Optionally: The dripping structure is used in conjunction with the detection component. The dripping structure includes a liquid storage cylinder and a dripping head fixed on the housing. A second piston extending into the housing is slidably disposed inside the liquid storage cylinder. A second ball bearing that intermittently abuts against the top plate is rotatably mounted at the bottom end of the second piston. The liquid storage cylinder and the dripping head are connected. A third return spring connected to the inner wall of the liquid storage cylinder is fixed on the outer surface of the second piston.

[0012] Another problem that this invention also needs to solve is to provide a method for using a defect detection and slitting mechanism for polypropylene film used in capacitors, comprising the following steps: S1. Equipment installation and securing: Place the frame stably in a suitable working position, ensuring the ground is flat and firm to guarantee the stability of the equipment during operation; Then weld frame two to the top side of frame one. During the welding process, ensure the welding quality so that frame two is firmly connected to frame one. Inside frame two, a smoothing assembly and a feeding roller are fixed by bolts. The smoothing assembly is used to smooth the film before slitting to ensure the flatness of the film; the feeding roller is used to guide the conveying direction of the film; at the same time, a feeding roller is installed on the other side of frame two to convey the polypropylene film to be slit. S1. Installation of the detection probe: First, use bolts to fix the probe mounting plate on the inside of frame two. Then, fix multiple detection probes in pairs at equal intervals on the probe mounting plate to ensure that the detection probes are firmly installed and accurately positioned so as to comprehensively and accurately detect film defects. S3. Assembly of testing equipment: S4. Equipment debugging: First, turn on the power to the equipment and check whether the indicator lights on the control box are displaying normally to ensure that the equipment is powered normally. Then, start the drive motor and observe whether the drive component can drive the swing arm and detection component to move normally. Check whether there are any abnormalities such as jamming or abnormal noise during the movement. Next, check whether the pressurization component is working normally and observe whether the first piston can reciprocate under the action of the first guide plate and whether there is gas ejection from the nozzle. Then, check whether the dripping structure is normal and observe whether the second piston can move up and down under the action of the second ball and the top plate. Check whether the dripping head can drip normally and whether the detection probe is working normally. Finally, you can simulate thin film defects to observe whether the detection equipment can accurately detect the defect signal. S5. Equipment Testing: First, the polypropylene film is cut with a cutter, and then the edges of the cut film are inspected with a detection probe to monitor the quality of the film edges. Then, the first stage of cleaning is carried out. The brush bristles first perform a preliminary cleaning of the cutter surface to remove dust, debris and other impurities attached to the cutter surface. If the quality is significantly improved, it indicates that the cutting problem in the previous stage was mainly caused by contaminated blade debris and oxide layer. The system records that contamination is the dominant factor. Next, the second-level light polishing effect test was conducted. A pressure friction block was used for short-term, light-pressure polishing to repair micro-defects on the cutting edge. The lightly polished cutter was then used to cut again. The quality data after cleaning and light polishing were analyzed and compared. If the quality was further improved, it indicated that the cutter had micro-dullness or micro-chipping. The system recorded that light wear already existed and that regular micro-polishing was required. Then, the third level of testing is the cooling and lubrication effect test after polishing. During or after polishing, coolant or lubricant is applied through a droplet structure, and cutting is performed using a cutter that has been treated with cooling and lubrication. The temperature and vibration signals during the cutting process are monitored, and the film quality is evaluated, with a focus on observing long-term stability. Finally, through cyclic testing, the optimal balance between cost, maintenance intensity, frequency, and film quality pass rate was found. The established model can accurately predict the cutter life and recommend the best maintenance actions or replacement timing before the quality critical point.

[0013] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, through multi-stage cleaning tests, can optimize the cutting blade state according to the characteristics of films of different specifications. For thinner films, the cutting blade needs to be sharper and have a smoother surface to reduce pulling and deformation during cutting and improve the testing flexibility of the film.

[0014] 2. Through multi-stage cleaning tests, the changes in the cutter's condition at different processing stages can be meticulously revealed, and how these changes specifically affect the cutting quality of polypropylene film. The tests show that after cleaning, the burr length of the film edge is significantly shortened during cutting, but some minor burrs may still exist due to slight unevenness on the cutter surface. The grinding process further eliminates minor scratches and wear layers on the cutter surface, making the cutter sharper. At this point, the flatness and smoothness of the film edge are greatly improved. Therefore, through such progressively in-depth testing, the impact mechanism of each cleaning step on cutting quality can be fully understood.

[0015] 3. This invention, through a multi-step detection and cutting mechanism, can effectively solve the problem of poor film slitting caused by contamination and wear of the cutting blade, such as burrs, frayed edges, and uneven cross-sections, thereby significantly improving the slitting quality of polypropylene film, reducing the generation of defective products, and enhancing the overall quality of the product.

[0016] 4. This invention, through multi-level cleaning tests, can optimize the cutting blade state according to the characteristics of films of different specifications. For example, for thinner films, the cutting blade needs to be sharper and have a smoother surface to reduce pulling and deformation during cutting. Through testing, the grinding accuracy and cooling method can be determined so that the cutting blade reaches a state suitable for cutting films of that thin specification.

[0017] 5. Based on the results of multi-level cleaning tests, this invention can formulate a scientific and reasonable preventive maintenance strategy for the cutting blade. According to the wear pattern of the cutting blade under different conditions and the trend of cutting quality change, maintenance parameters such as the cleaning cycle, grinding frequency and cooling method of the cutting blade can be determined. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of the overall structure of this application; Figure 2 This is a schematic diagram of the slitting component of this application; Figure 3 This is a schematic diagram of the testing equipment used in this application; Figure 4 This is a partial structural schematic diagram of the testing equipment in this application; Figure 5 This is a schematic diagram of the structure of the driver component of this application; Figure 6 This is a side view of the structure of the detection component in this application; Figure 7 This is a schematic diagram of the structure of the second guide plate of this application; Figure 8 This is a cross-sectional view of the supercharger assembly of this application; Figure 9 This is a cross-sectional view of the droplet structure of this application.

[0019] Explanation of reference numerals in the attached figures: 1. Frame 1; 2. Frame 2; 3. Control box; 4. Slitting assembly; 41. Cutter; 42. Cutter shaft; 5. Feed roller; 6. Distributor roller; 7. Detection probe; 71. Probe mounting plate; 8. Smoothing assembly; 9. Detection equipment; 91. Housing; 910. Sliding port; 92. Detection assembly; 921. Concave seat; 922. Side plate; 923. Top plate; 924. Lifting shaft; 925. Connecting rod; 926. Guide shaft; 927. First ball bearing; 928. First return spring; 929. Pressure friction block; 93. Drive assembly; 931. Drive motor; 9 32. Rotating seat; 933. Transmission gear; 94. Swing arm; 95. Pressurization assembly; 951. Pressurization cylinder; 952. First piston; 953. Roller; 954. Check valve; 955. Nozzle; 956. Second return spring; 96. First guide plate; 97. Dropping structure; 971. Liquid reservoir; 972. Second piston; 973. Second ball bearing; 974. Third return spring; 975. Dropping head; 98. Second guide plate; 981. Plate body; 982. First guide surface; 983. Second guide surface; 984. Third guide surface; 985. Transition surface. Detailed Implementation The following is in conjunction with the appendix Figures 1-9 This application will be described in further detail.

[0020] like Figures 1-9 As shown in the figure, this example provides a defect detection and slitting mechanism for polypropylene film used in capacitors, including a frame 1, a frame 2, a control box 3, and a slitting assembly 4. The slitting assembly 4 includes a cutter 41 and a cutter shaft 42. The cutter 41 is a key component that directly slits the polypropylene film, and its sharpness and precision directly affect the slitting quality of the film. Specifically, the frame 2 is welded to the top side of the frame 1, and the control box 3 is bolted to one side of the frame 1. The inner side of the frame 2 is provided with a smoothing assembly 8 and a feeding roller 6 for use with the slitting assembly 4. The other side of the frame 2 is also equipped with a feeding roller 5.

[0021] In this embodiment, the cutter 41 is externally equipped with a detection probe 7 and a detection device 9 used in conjunction with the detection probe 7; the inner side of the frame 2 is bolted with a probe mounting plate 71. There are multiple detection probes 7, and the multiple detection probes 7 are fixed on the probe mounting plate 71 in pairs at equal intervals. Through the design of multiple probes distributed at equal intervals, the defects on the film surface can be detected comprehensively and meticulously, which greatly improves the accuracy and comprehensiveness of defect detection and effectively avoids the occurrence of missed detection.

[0022] The detection device 9 in this embodiment includes a housing 91 that is fitted outside the cutter 41 and has a hollow interior, a detection component 92 and a second guide plate 98 that are used in conjunction inside the housing 91; the housing 91 is fixed on the frame 2; the detection component 92 includes a concave seat 921, two side plates 922 disposed inside the concave seat 921, and a top plate 923 disposed above the concave seat 921, wherein a plurality of bristles and two pressure friction blocks 929 are disposed between the two side plates 922. Through the combination design of the bristles and the pressure friction blocks 929, the film surface can be cleaned and its physical state fine-tuned before detection, thereby improving the detection accuracy. In this embodiment, both side plates 922 are provided with abutment members that cooperate with the second guide plate 98. Specifically, the abutment member includes a guide shaft 926, a first ball bearing 927 rotatably mounted on one end of the guide shaft 926, and a first return spring 928 fixed to the outer surface of the guide shaft 926. One end of the guide shaft 926 is fixed to the outer wall of one of the side plates 922, and the two side plates 922 achieve relative synchronous movement through the abutment members and the second guide plate 98. It should be noted that the abutment member structure can correlate the linear movement of the side plate 922 with the contour change of the second guide plate 98. Furthermore, the housing 91 provides a closed and stable working environment for the internal detection component 92, reducing the interference of external factors on the detection process and improving the reliability of the detection. Therefore, the detection component 92 and the second guide plate 98 used in cooperation inside the housing 91 work together to achieve precise guidance and control of the detection component 92.

[0023] To achieve multi-level testing, the second guide plate 98 in this embodiment includes a plate body 981. The plate body 981 is provided with a first guide surface 982, a second guide surface 983, and a third guide surface 984 arranged from low to high. A transition surface 985 is provided between adjacent two surfaces. Through the design of the multi-level guide surface and the transition surface 985, such as the first guide surface 982, the second guide surface 983, and the third guide surface 984, the moving distance and speed of the side plate 922 can be precisely controlled according to different testing and maintenance needs, so as to achieve different degrees of cleaning and polishing of the cutter 41, thereby improving the flexibility and adaptability of the equipment. Furthermore, by changing or redesigning the contour of the second guide plate 98, the opening and closing range of the side plate 922 and the contact pressure and time of the pressure friction block 929 can be easily changed. Thus, by changing the shape, various working modes can be defined, such as cleaning without contact (e.g., the first ball 927 only moves on the low plane), light contact polishing of the middle plane, short stroke, heavy contact polishing of the high plane, and long stroke.

[0024] It is important to note that polypropylene films for capacitors come in various specifications, with differences in thickness, width, and material properties, resulting in varying requirements for cutting quality. Multi-stage cleaning tests can optimize the cutter 41 based on the characteristics of different film specifications. For thinner films, the cutter 41 needs to be sharper and have a smoother surface to reduce pulling and deformation during cutting. Testing can determine the grinding precision and cooling method to ensure the cutter 41 is suitable for cutting that thin film. For thicker films, it may be necessary to appropriately increase the strength and wear resistance of the cutter 41; multi-stage cleaning tests can also identify corresponding cutter 41 treatment solutions. Furthermore, in actual production, in addition to different film specifications, there may be diverse requirements such as different production batches and production speeds. Multi-stage cleaning testing can flexibly adjust the state of the cutter 41 according to these requirements, achieving testing adaptability to different films.

[0025] The detection component 92 in this embodiment also includes a lifting shaft 924 fixed to the lower surface of the top plate 923. The bottom end of the lifting shaft 924 extends into the concave seat 921. The two side plates 922 are hinged to each other on opposite sides and to the two sides of the bottom end of the lifting shaft 924. The shape of the top plate 923 is adapted to the top side of the housing 91. The adaptation design of the top plate 923 and the top side of the housing 91, such as guide rails, slides, and positioning pins, can limit the upward movement path of the top plate 923, ensuring that it moves smoothly in a predetermined direction and avoiding deviation or jamming.

[0026] To improve the testing effect, the housing 91 in this embodiment has a sliding port 910 inside. The testing device 9 also includes a driving component 93, a pressurizing component 95 and a dripping structure 97. A swing arm 94 is provided between the driving component 93 and the concave seat 921, and one side of the swing arm 94 extends through the sliding port 910 into the housing 91 and is fixed to the outer wall of the concave seat 921.

[0027] To drive the detection component 92, in this embodiment, the drive component 93 includes a drive motor 931 and three transmission gears 933. The outer wall of the left transmission gear 933 is fixed with a rotating seat 932 that is fixedly connected to the swing arm 94. The right transmission gear 933 is fixed to the output shaft of the drive motor 931. The three transmission gears 933 mesh with each other and drive the detection component 92 to move through the swing arm 94.

[0028] It should be noted that the pressurizing component 95 is installed on the outer wall of the swing arm 94 and moves with the swing arm 94. In use, the pressurizing component 95 uses the movement of the swing arm 94 to drive the first piston 952 to reciprocate and generate pressure for purging. No additional power source is required. The structure is simple and ingenious, energy-saving and efficient. It can clean impurities on the surface of the cutter 41 in time, ensure the slitting quality, and reduce equipment failure and production interruption caused by impurities. Specifically, the pressurizing component 95 includes a pressurizing cylinder 951 fixed on the outer wall of the swing arm 94 and a slidably disposed inside the pressurizing cylinder 951. The first piston 952, the check valve 954 fixed on the outer wall of the booster cylinder 951, and the nozzle 955 fixed on one side of the concave seat 921 are provided. The check valve 954 is connected to the nozzle 955. The first piston 952 extends to the outside of the booster cylinder 951, and a roller 953 is rotatably installed at the bottom end of the first piston 952. It should be noted that the booster assembly 95 can be used for vacuuming or for cleaning in conjunction with the detection assembly 92. When vacuuming, a filter tube needs to be installed on the booster assembly 95. When used for blowing air, a vacuuming device needs to be installed on the housing 91 for collection.

[0029] To drive the booster assembly 95, a first guide plate 96 with a wave-shaped shape is fixed on the outer wall of the housing 91. The roller 953 abuts against the outer surface of the first guide plate 96. A second return spring 956 is installed on the outside of the first piston 952. During the movement of the swing arm 94, the roller 953 rolls along the wave-shaped surface of the first guide plate 96, causing the first piston 952 to reciprocate in the booster cylinder 951, thereby generating pressure. The gas is then ejected through the check valve 954 and the nozzle 955 to blow clean the surface of the cutter 41, further cleaning the impurities on the surface of the cutter 41, so that the booster assembly 95 can cooperate with the first stage cleaning.

[0030] It should be noted that the dripping structure 97 in this embodiment is used in conjunction with the detection component 92. Specifically, the dripping structure 97 includes a liquid storage cylinder 971 fixed on the housing 91 and a dripping head 975. A second piston 972 extending into the housing 91 is slidably disposed inside the liquid storage cylinder 971. A second ball bearing 973 is rotatably mounted at the bottom end of the second piston 972, intermittently abutting against the top plate 923. The liquid storage cylinder 971 and the dripping head 975 are connected. A third return spring 974 connected to the inner wall of the liquid storage cylinder 971 is fixed on the outer surface of the second piston 972. When the top plate 923 moves up and down, it abuts against the second ball bearing 975. When the three parts are in contact, the second piston 972 will be pushed upward, and the coolant or lubricant in the reservoir 971 will drip onto the surface of the cutter 41 through the drip head 975. During the grinding process, the cutter 41 will be cooled and lubricated. The cutter is cut using a blade that has been cooled and lubricated. The temperature and vibration signals during the cutting process are monitored, and the film quality is evaluated. This can effectively suppress the softening of the cutting edge or the adhesion of materials caused by the heat accumulation of the blade, so that the film cutting quality remains stable over a longer stroke and reduces the curling or deformation of the film edge caused by thermal stress. The reservoir 971 is fixed to the top side of the housing 91 and is adapted to the position of the sliding port 910.

[0031] To further explain, the dripping structure 97 is triggered by the top plate 923 and can be used for synchronous cooling and lubrication during polishing, while the booster assembly 95 is driven by the first guide plate 96 and is used for cleaning air blowing. They can be used separately or in combination. For example, only the booster jet can be activated in a pure cleaning test, while dripping and light polishing can be activated simultaneously or sequentially in a polishing cooling test.

[0032] Example 2. Another problem that the present invention needs to solve is to provide a method for using a defect detection and slitting mechanism for polypropylene film used in capacitors, including the following steps: S1. Equipment installation and securing: Place the frame 1 stably in a suitable working position, ensuring that the ground is flat and firm to guarantee the stability of the equipment during operation; Then weld frame 2 to the top side of frame 1. During the welding process, ensure the welding quality so that frame 2 and frame 1 are firmly connected. Inside frame 2, a smoothing assembly 8 and a feeding roller 6 are fixed by bolts. The smoothing assembly 8 is used to smooth the film before slitting to ensure the flatness of the film. The feeding roller 6 is used to guide the conveying direction of the film. At the same time, a feeding roller 5 is installed on the other side of frame 2 to convey the polypropylene film to be slit. S1. Installation of detection probe 7: First, use bolts to fix the probe mounting plate 71 on the inside of the frame 2. Then, fix multiple detection probes 7 in pairs at equal intervals on the probe mounting plate 71 to ensure that the detection probes 7 are firmly installed and accurately positioned so as to be able to detect film defects comprehensively and accurately. S3, Assembly of testing equipment 9: S4. Equipment debugging: First, turn on the power supply to the equipment and check whether the indicator lights in the control box 3 are displayed normally to ensure that the equipment is powered normally. Then, start the drive motor 931 and observe whether the drive component 93 can drive the swing arm 94 and the detection component 92 to move normally. Check whether there are any abnormalities such as jamming or abnormal noise during the movement. Next, check whether the pressurization component 95 is working normally and observe whether the first piston 952 can reciprocate under the action of the first guide plate 96 and whether there is gas ejection from the nozzle 955. Then, check whether the dripping structure 97 is normal and observe whether the second piston 972 can move up and down under the action of the second ball 973 and the top plate 923. Check whether the dripping head 975 can drip normally and check whether the detection probe 7 is working normally. Finally, by simulating a thin film defect, observe whether the detection device 9 can accurately detect the defect signal. S5. Equipment Testing: First, the polypropylene film is cut using the cutter 41, and the edge of the cut film is inspected using the detection probe 7 to monitor the quality of the film edge. Then, the first stage of cleaning is carried out. The brush bristles first perform a preliminary cleaning of the surface of the cutter 41 to remove dust, debris and other impurities attached to the surface of the cutter 41. If the quality is significantly improved, it indicates that the cutting problem in the previous stage was mainly caused by the adhesion of contaminated blade chips and oxide layer. The system records that contamination is the dominant factor. Next, the second-level light polishing effect test was conducted. The pressure friction block 929 was used for short-term, light-pressure polishing to repair micro-defects on the cutting edge. The lightly polished cutter 41 was then used to cut again. The quality data after cleaning and light polishing were analyzed and compared. If the quality was further improved, it indicated that the cutter 41 had micro-dullness or micro-chipping. The system recorded that light wear already existed and that regular micro-polishing was required. Then, the third level test is the cooling and lubrication effect test after polishing. During or after polishing, coolant or lubricant is applied through the droplet structure 97, and cutting is performed using the cutter 41 that has been treated with cooling and lubrication. The temperature and vibration signals during the cutting process are monitored, and the film quality is evaluated, with a focus on observing long-term stability. Finally, through cyclic testing, the optimal balance between cost, maintenance intensity, frequency, and film quality pass rate was found. The established model can accurately predict the life of the cutter 41 and recommend the best maintenance actions or replacement time before the quality critical point.

[0033] Combined with appendix Figures 1-9 The working principle of the above embodiments is as follows: Polypropylene film is conveyed to the inner side of frame 2 by conveying roller 5. Smoothing component 8 smooths the film so that it enters the working area of ​​slitting component 4 flat. Separating roller 6 assists in the conveying and positioning of the film. Multiple detection probes 7 are fixed at equal intervals in pairs on probe mounting plate 71 to detect defects in the polypropylene film. Since the cutter 41 may be in poor condition due to contamination or wear, defective products such as burrs, frayed edges, and uneven cross-sections are produced when the cutter 41 cuts the film. At this time, the sensor detects the film quality detection alarm. First, the detection component 92 moves under the drive of the drive component 93. The rotating seat 932 drives the swing arm 94 to move, and the swing arm 94 drives the detection component 92 to move. During the movement of the detection component 92, the distance between the two side plates 922 is continuously reduced by passing through the first guide surface 982, the second guide surface 983 and the third guide surface 984 on the second guide plate 98 from low to high. When the detection component 92 moves from the first guide surface 982 to the second guide surface 983, the bristles of the two side plates 922 physically or chemically clean the cutter 41 to remove dirt. The cleaned cutter 41 is then used to make a test cut, and the test cut sample is tested by the detection probe 7. If the film quality meets the standard, it is returned to production. If it still does not meet the standard, the process proceeds to the next step. At this time, the drive component 93 is restarted to drive the detection component 92 to continue to move. At this time, the detection component 92 moves from the second guide surface 983 to the third guide surface 984. At this time, the adhesion force of the two side plates 922 is enhanced, so that the pressure friction block 929 is in contact with the outer surface of the cutter 41. Automatic grinding is performed by rotating the cutter 41. After grinding, the film is tested again. If the quality meets the standard, the conveying is resumed. If the quality still fails to meet the standard, the detection component 92 is moved to the rightmost side of the sliding port 910, and the concave seat 921 is also moved to the rightmost side of the second guide plate 98. At this time, since the two side plates 922 are closest to each other, the lifting shaft 924 is lifted by the connecting rod 925, so that the top plate 923 moves up and contacts the second ball 973, thereby pushing the second piston 972 to move up and push the liquid inside the liquid storage cylinder 971. Finally, the liquid is dripped into the outer surface of the cutter 41 by the dripping head 975 for polishing. If the quality fails to meet the standard again, the system can determine that the life of the cutter 41 has been exhausted and issue a cutter 41 replacement alarm to prevent the continued production of defective products.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A defect detection and slitting mechanism for polypropylene film used in capacitors, comprising a frame one (1), a frame two (2), a control box (3), and a slitting assembly (4), characterized in that: The slitting assembly (4) comprises a cutter (41) and a cutter shaft (42), and the cutter (41) is externally provided with a detection probe (7) and a detection device (9) matched with the detection probe (7); The detection device (9) comprises a shell (91) which is sleeved on the outside of the cutter (41) and is internally hollowed, a detection assembly (92) and a second guide plate (98) which are matched and used in the shell (91); the detection assembly (92) comprises a concave seat (921), two side plates (922) which are arranged in the concave seat (921) and are two in number, and a top plate (923) which is arranged above the concave seat (921), wherein a plurality of bristles and two pressure friction blocks (929) are arranged between the two side plates (922), and the two side plates (922) are each provided with an abutting piece matched with the second guide plate (98). The abutting piece comprises a guide shaft (926), a first rolling ball (927) rotatably installed at one end of the guide shaft (926), and a first return spring (928) fixed to the outer surface of the guide shaft (926), one end of the guide shaft (926) is fixed to the outer wall of one of the side plates (922), and the two side plates (922) are relatively synchronously moved through the abutting cooperation of the abutting piece and the second guide plate (98). The second guide plate (98) comprises a plate body (981), and the plate body (981) is provided with a first guide surface (982), a second guide surface (983) and a third guide surface (984) from low to high, wherein a transition surface (985) is arranged between adjacent two surfaces.

2. The polypropylene film defect detection and slitting mechanism for capacitors according to claim 1, characterized in that: The second rack (2) is welded to the top side of the first rack (1), the control case (3) is bolted to one side of the first rack (1), the inner side of the second rack (2) is provided with a smoothing assembly (8) and a material distribution roller (6) matched with the slitting assembly (4), and the other side of the second rack (2) is further provided with a material conveying roller (5).

3. The polypropylene film defect detection and slitting mechanism for capacitors of claim 1, wherein: The inner side of the second rack (2) is bolted with a probe mounting plate (71), and the detection probe (7) is multiple in number and fixed on the probe mounting plate (71) in groups of two at equal intervals.

4. The polypropylene film defect detection and slitting mechanism for capacitors of claim 1, wherein: The detection assembly (92) further comprises a lifting shaft (924) fixed to the lower surface of the top plate (923), and the bottom end of the lifting shaft (924) extends into the concave seat (921), wherein a connecting rod (925) is hingedly connected between the opposite side of the two side plates (922) and the two sides of the bottom end of the lifting shaft (924), and the top plate (923) is matched with the top side of the shell (91) in shape.

5. The polypropylene film defect detection and slitting mechanism for capacitors of claim 1, wherein: The inner side of the shell (91) is provided with a sliding opening (910), and the detection device (9) further comprises a driving assembly (93), a pressure increasing assembly (95) and a drop structure (97), the driving assembly (93) and the concave seat (921) are provided with a swing arm (94), one side of the swing arm (94) extends into the shell (91) through the sliding opening (910) and is fixed to the outer wall of the concave seat (921).

6. The polypropylene film defect detection and slitting mechanism for capacitors of claim 5, wherein: The driving assembly (93) comprises a driving motor (931) and three transmission gears (933), the outer wall of the left transmission gear (933) is fixed with a rotating seat (932) fixedly connected with the swing arm (94), the right transmission gear (933) is fixed on the output shaft of the driving motor (931), the three transmission gears (933) are in meshing connection, and the detection assembly (92) is driven to move through the swing arm (94).

7. The polypropylene film defect detection and slitting mechanism for capacitors of claim 5, wherein: The booster assembly (95) is installed on the outer wall of the swing arm (94) and moves with the swing arm (94), the booster assembly (95) comprises a booster cylinder (951) fixed on the outer wall of the swing arm (94), a first piston (952) slidably arranged in the booster cylinder (951), a check valve (954) fixed on the outer wall of the booster cylinder (951) and a nozzle (955) fixed on one side of the concave seat (921), wherein the check valve (954) is in communication with the nozzle (955), the first piston (952) extends to the outside of the booster cylinder (951), and the bottom end of the first piston (952) is rotatably provided with a roller (953).

8. The polypropylene film defect detection and slitting mechanism for capacitors of claim 7, wherein: The outer wall of the casing (91) is fixed with a first guide plate (96) in the shape of a wave, the roller (953) abuts against the outer surface of the first guide plate (96), and the first piston (952) is externally provided with a second return spring (956).

9. The polypropylene film defect detection and slitting mechanism for capacitors of claim 5, wherein: The drop structure (97) is used in cooperation with the detection assembly (92), the drop structure (97) comprises a liquid storage cylinder (971) and a drop head (975) fixed on the casing (91), the inside of the liquid storage cylinder (971) is slidably provided with a second piston (972) extending into the inside of the casing (91), the bottom end of the second piston (972) is rotatably provided with a second ball (973) intermittently abutting against the top plate (923), the liquid storage cylinder (971) and the drop head (975) are in communication, and the outer surface of the second piston (972) is fixedly provided with a third return spring (974) connected with the inner wall of the liquid storage cylinder (971).

10. The use of the polypropylene film defect detection and slitting mechanism for capacitor, using the polypropylene film defect detection and slitting mechanism for capacitor according to any one of claims 1-9, characterized in that: The method comprises the following steps: S1, equipment installation and fixation: Place the rack one (1) stably on a suitable working position, ensure that the ground is flat and solid, and ensure the stability during equipment operation; Then weld the rack two (2) to the top side of the rack one (1), and ensure the welding quality during the welding process, so that the rack two (2) is firmly connected with the rack one (1); On the inner side of the rack two (2), the flattening assembly (8) and the material distribution roller (6) are fixed by bolts, the flattening assembly (8) is used to flatten the film before cutting, and the flatness of the film is ensured; the material distribution roller (6) is used to guide the conveying direction of the film; at the same time, the material conveying roller (5) is installed on the other side of the rack two (2) for conveying the polypropylene film to be cut; S1, detection probe (7) installation: First, in the inner side of the rack two (2), using bolted probe mounting plate (71), and then a plurality of detection probe (7) two groups of equidistant fixed on the probe mounting plate (71), ensure that the detection probe (7) is installed firmly, and the position is accurate, so as to be able to detect the film defects comprehensively and accurately; S3, detection equipment (9) assembly: S4, equipment debugging: First, the power supply of the equipment is turned on, the indicator lights of the control box (3) are checked to ensure that the power supply of the equipment is normal, then the driving motor (931) is started, and it is observed whether the driving assembly (93) can normally drive the swing arm (94) and the detection assembly (92) to move, whether there is jamming, abnormal noise and other abnormal conditions during movement are checked, then whether the supercharging assembly (95) is working normally is checked, whether the first piston (952) can make reciprocating motion under the action of the first guide plate (96) is observed, whether the nozzle (955) has gas spouting is observed, then whether the droplet structure (97) is normal is checked, whether the second piston (972) can make up and down motion under the abutting action of the second ball (973) and the top plate (923) is observed, whether the droplet head (975) can normally drip is observed, whether the detection probe (7) can work normally is checked, finally, the detection equipment (9) can be observed whether it can accurately detect the defect signal by simulating the film defect. S5, equipment test: First, the polypropylene film is cut by the cutter (41), and the detection probe (7) is used to detect the edge of the cut film to monitor the quality of the film edge; Then, the first level cleaning is carried out, the bristles first clean the surface of the cutter (41) to remove dust, debris and other impurities attached to the surface of the cutter (41), if the quality is significantly improved, it means that the cutting problem in the previous stage is mainly caused by the adhesion of contaminated cutting chips and the oxidation layer, the system records that pollution is the dominant factor; Then, the second level light polishing effect test is carried out, the pressure friction block (929) is used for short time and light pressure polishing to modify the micro defect of the cutting edge, the cutter (41) after light polishing is used for cutting again, and the quality data before and after cleaning and light polishing is analyzed and compared, if the quality is further improved, it means that the cutter (41) has micro passivation or small chipping, the system records that light wear exists and needs to be polished regularly; Then, the third level test is carried out, the cooling liquid or lubricant is applied through the droplet structure (97) at the same time or after polishing, the cutter (41) treated by cooling and lubrication is used for cutting, the temperature and vibration signal in the cutting process are monitored, and the film quality is evaluated, and the long-term stability is observed; Finally, through the cycle test, the optimal balance point of cost maintenance action intensity, frequency and quality film qualified rate is found, the model established can accurately predict the service life of the cutter (41), and the best maintenance action or replacement opportunity is recommended before the quality critical point.

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