Film defect detection device and detection method

Abstract

The present application discloses a film defect detection device and a detection method, comprising a frame, a conveying mechanism and a detection mechanism; the frame is used to support and fix the conveying mechanism and the detection mechanism; the conveying mechanism is used to convey the film to make it pass through the detection mechanism; the detection mechanism comprises an airflow seat and a sensing table, the airflow seat and the sensing table are respectively arranged on both sides of the film, the airflow seat is suitable for spraying airflow to the film, the airflow is suitable for passing through the defective part of the film, a plurality of sensing blocks are distributed on the sensing table, the sensing blocks are suitable for sensing the airflow passing through the film and obtaining the position information of the airflow appearing, the detection device can quickly detect, record and mark the defective parts of the solar backplane film during the production process, so as to facilitate the subsequent analysis and improve the process.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a thin film defect detection device and a detection method. Background Art

[0002] There are three main production process methods for solar cell backsheets: one is the three-layer composite process of PVF / PVDF and other fluorine-containing films + BOPET film + PVF / PVDF and other fluorine-containing films, which is widely accepted by photovoltaic module brand manufacturers. That is, the solar backsheet consists of a three-layer structure, the outer layer is T film, the middle layer is P film, and T and P are bonded with glue. Among them, T represents fluorine-containing films such as polyvinyl fluoride (PVF) / polyvinylidene fluoride (PVDF), which is the main layer used as solar cell packaging material, and its functions are weather resistance, UV resistance, aging resistance, etc.; P represents polyester film (BOPET), and its main functions are electrical insulation, water vapor barrier, resistance to moisture and heat aging, dimensional stability, tear resistance and easy processing, etc.; one type is to use ordinary polyester film (BOPET) as the middle layer substrate, and composite modified polyester film on both sides, that is, a three-layer composite process of modified polyester film + ordinary polyester film + modified polyester film, in which the modified polyester film material is equivalent to the function and role of the fluorine-containing film; the third type is to use polyester film (BOPET) as the substrate, and use a surface coating process to coat and solidify the fluorine-containing resin on the surface of the polyester film.

[0003] As photovoltaic cell module manufacturers further increase their requirements for extending battery life and photoelectric conversion efficiency, the requirements for polyester film, a supporting material for photovoltaic cells, are becoming more and more stringent. The produced film is required to have a soft, flat and smooth surface, and should not have defects such as wrinkles, tears, particles, bubbles, pinholes, and foreign impurities. The edges of the film should be neat and undamaged.

[0004] However, the existing production process of solar backplane films has the following defects: since the film is made of transparent material and is relatively thin, it is difficult to comprehensively detect flaws and defects on the film during the production process, and the effect of analysis and identification using optical principles is not ideal. Summary of the invention

[0005] One object of the present application is to provide a film defect detection device and a detection method that can quickly detect, record and mark defective parts of a solar backplane film during the production process.

[0006] In order to achieve the above objectives, the technical solution adopted in this application is: a film defect detection device and detection method, including a frame, a conveying mechanism and a detection mechanism;

[0007] The frame is used to support and fix the conveying mechanism and the detection mechanism;

[0008] The conveying mechanism is used to convey the film to pass through the detection mechanism;

[0009] The detection mechanism includes an airflow seat and a sensing platform, wherein the airflow seat and the sensing platform are respectively arranged on both sides of the film, the airflow seat is suitable for spraying airflow toward the film, and the airflow is suitable for passing through the defective part of the film, and a plurality of sensing blocks are distributed on the sensing platform, and the sensing blocks are suitable for sensing the airflow passing through the film and obtaining the position information of the place where the airflow appears.

[0010] Specifically, the sensing table includes a sensing top plate and a sensing mesh plate. The sensing top plate, the sensing mesh plate, the film and the airflow seat are arranged in sequence from top to bottom in the detection mechanism. A plurality of sensing columns are arranged at equal intervals below the sensing top plate. A conductive plate is slidably arranged at the sensing columns. A plurality of fixed mesh holes are evenly opened on the sensing mesh plate. Conductive sheets are distributed around the fixed mesh holes. Conductive heads connected to the conductive sheets are arranged around the sensing mesh plate. The sensing columns are installed in the fixed mesh holes. The conductive plates are connected to the conductive sheets when they are stationary. The conductive plates are suitable for being blown by the airflow appearing at the film defects and being disconnected from the conductive sheets.

[0011] As an improvement, the main body shape of the conductive plate is a cross, and the conductive plate is provided with independent conductive circuits in the longitudinal direction and the transverse direction, and the conductive circuits are suitable for connecting the conductive sheet in the longitudinal direction and the conductive sheet in the transverse direction respectively.

[0012] As an improvement, a plurality of air inlets are evenly arranged around the air flow seat, a plurality of air outlets connected to the air inlets are arranged at equal intervals above the air flow seat, a constant pressure chamber is arranged inside the air flow seat, the constant pressure chamber is connected to the air inlets and the air inlets respectively, the ratio of the total area of ​​the air inlets to the total area of ​​the air outlets is α, 1.4≤α≤1.6.

[0013] As an improvement, the end of the sensing column is conical, and a spray pipe is provided on the air outlet, and the spray pipe is matched with the sensing column one by one.

[0014] As an improvement, it also includes a marking mechanism, which includes a guide rail, a motor, a sliding assembly and a marking head. The guide rail is laterally arranged above the film on the discharge side of the detection mechanism. The sliding assembly is slidably arranged on the guide rail. The marking head is detachably arranged on the sliding assembly. The motor is used to control the sliding of the sliding assembly. The sliding assembly includes a transmission wheel group and a pulley. Connecting teeth are arranged on one side of the guide rail, and the transmission wheel group is connected to the guide rail gear rack. A sliding groove is arranged on the other side of the guide rail. The pulley is arranged in the sliding groove and cooperates with the transmission wheel group to clamp the guide rail.

[0015] As an improvement, the marking mechanism further includes an imaging device, which is disposed in the detection mechanism and is used to take a photo of the film where the airflow occurs.

[0016] Specifically, the conveying mechanism includes a feed roller, a winding roller and a conveying wheel group, the feed roller and the winding roller are arranged at both ends of the frame, the conveying wheel group is arranged on both sides of the frame, the conveying wheel group includes a first conveying wheel and a second conveying wheel, the first conveying wheel and the second conveying wheel cooperate to clamp the film, and the first conveying wheel and the second conveying wheel are suitable for moving the film toward the winding roller.

[0017] As an improvement, the conveying wheel group is arranged around the detection mechanism, and the conveying wheel group cooperates to tension the film in the detection mechanism. Force measuring modules are provided at both ends of the winding roller, and the force measuring modules are suitable for detecting the pulling force at both ends of the winding roller, thereby controlling the rotation speed of the conveying wheel group on both sides of the frame.

[0018] A film defect detection method, comprising the steps of:

[0019] The film to be tested is rolled up on the feeding roller, a guide film is provided at the front end of the film to connect with the winding roller, and the conveying wheel group tensions the film in the testing mechanism;

[0020] The airflow seat inflates the constant pressure chamber through the air inlet, and then sprays air to the film through the air outlet through the spray pipe. The airflow is suitable for passing through the defective part of the film and spraying to the sensing column, so that the conductive plate and the conductive sheet are disconnected from the circuit.

[0021] The induction table obtains the location information of the circuit disconnection point, and the imaging device takes pictures of the damaged position of the film for archiving;

[0022] The coiling roller and the conveying wheel group rotate synchronously to allow the next part of the film to be inspected to enter the inspection mechanism. The coiling roller receives the film after inspection. The force measuring module detects the pulling force at both ends of the coiling roller when receiving the film, and adjusts the rotation speed of the conveying wheel group on both sides of the film in real time to prevent the film from lateral displacement when moving.

[0023] The background system calculates the marking position and marking time through the position information of the circuit disconnection point and the rotation speed of the conveying wheel group. The sliding component moves the marking head above the marking position in advance according to the data calculated by the background system. After the marking time, the marking head sprays color paint to mark the damaged position of the film.

[0024] Compared with the prior art, the beneficial effects of the present application are: utilizing gas to detect the physical properties and defects of the produced film, and gas compressing the film to detect its tensile strength and surface tension. If there are slight damage defects or weak parts with insufficient performance on the film, they can be quickly identified and recorded, and photographed and archived using an imaging device, and then the damaged parts can be marked by spraying paint through a marking mechanism, which is convenient for subsequent analysis of the problem and thus to achieve improvements in the production process. The detection equipment has a relatively simple structure and low manufacturing difficulty. It is not easy to damage the defective parts of the film during the detection process, and regional detection of the film can be performed with high detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a stereogram of a preferred embodiment according to the present application;

[0026] Figure 2 is an exploded view according to a preferred embodiment of the present application;

[0027] Figure 3 is a front view according to a preferred embodiment of the present application;

[0028] Figure 4 is an enlarged structural view of a sensing column according to a preferred embodiment of the present application;

[0029] Figure 5 According to a preferred embodiment of the present application Figure 2 The enlarged view at a in the middle;

[0030] Figure 6 According to a preferred embodiment of the present application Figure 2 The enlarged view at b in the middle;

[0031] Figure 7 is an overall structural view of a conveying wheel assembly according to a preferred embodiment of the present application;

[0032] Figure 8 It is an overall structural view of a marking mechanism according to a preferred embodiment of the present application.

[0033] In the figure: 1. frame; 2. conveying mechanism; 21. feeding roller; 22. winding roller; 221. force measuring module; 23. conveying wheel group; 231. first conveying wheel; 232. second conveying wheel; 3. detection mechanism; 31. induction table; 311. induction top plate; 3111. induction column; 3112. conductive plate; 312. induction mesh plate; 3121. fixed mesh; 3122. conductive sheet; 3123. conductive head; 32. air flow seat; 321. air inlet; 322. air outlet; 3221. injection pipe; 323. constant pressure chamber; 4. marking mechanism; 41. guide rail; 411. sliding groove; 42. motor; 43. sliding assembly; 431. transmission wheel group; 432. pulley; 44. marking head; 45. imaging device. DETAILED DESCRIPTION

[0034] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0037] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0038] The present application is further described below with reference to the accompanying drawings:

[0039] like Figures 1 to 3 As shown, a preferred embodiment of the present application includes a frame 1, a conveying mechanism 2, a detection mechanism 3 and a marking mechanism 4.

[0040] The frame 1 is used to support and fix the conveying mechanism 2 , the detecting mechanism 3 and the marking mechanism 4 .

[0041] The conveying mechanism 2 includes a feed roller 21 and a winding roller 22, which are arranged at both ends of the frame 1. The feed roller 21 is suitable for placing the film to be tested, and the winding roller 22 is suitable for receiving the film after testing. The film can be received in time to reduce the probability of damage to the film during the testing process.

[0042] The marking mechanism 4 is disposed between the detection mechanism 3 and the winding roller 22 , and is used to mark defect positions of the film after detection.

[0043] The detection mechanism 3 includes an airflow seat 32 and a sensing platform 31, which are respectively arranged on both sides of the film. The airflow seat 32 is suitable for spraying airflow to the film, and the airflow is suitable for passing through the defective parts of the film. A plurality of sensing blocks are distributed on the sensing platform 31, and the sensing blocks are suitable for sensing the airflow passing through the film and obtaining the position information of the place where the airflow appears.

[0044] like Figures 2 to 6 As shown, the sensing table 31 includes a sensing top plate 311 and a sensing mesh plate 312. The sensing top plate 311, the sensing mesh plate 312, the film and the airflow seat 32 are arranged in sequence from top to bottom in the detection mechanism 3. A plurality of sensing columns 3111 are arranged at equal intervals below the sensing top plate 311. A conductive plate 3112 is slidably arranged at the sensing columns 3111. A plurality of fixed mesh holes 3121 are evenly arranged on the sensing mesh plate 312. Conductive sheets 3122 are distributed around the fixed mesh holes 3121. The fixed mesh holes 3121 and the conductive sheets 3122 around them form a sensing block. Conductive heads 3123 connected to the conductive sheets 3122 are arranged around the sensing mesh plate 312. The sensing columns 3111 are cooperatively installed in the fixed mesh holes 3121. The conductive sheets 3112 are connected to the conductive sheets 3122 when stationary. The conductive sheets 3112 are suitable for being blown by the airflow appearing at the film defect and disconnected from the conductive sheets 3122.

[0045] The conductive plate 3112 is in the shape of a cross, and is provided with independent conductive circuits in the longitudinal and transverse directions, so that when the conductive plate 3112 is set, the conductive circuit can be aligned with the conductive sheet 3122 to avoid the conductive circuit being offset and not connecting the conductive sheet 3122. The conductive circuits are respectively suitable for connecting the longitudinal conductive sheet 3122 and the transverse conductive sheet 3122. Since the fixed mesh 3121 cannot be too small, only a range confirmation can be performed when the conductive plate 3112 is disconnected. The transverse circuit and the longitudinal circuit are separated and set. If one end of the conductive plate 3112 is detached, only one circuit will be triggered to be turned on and off. The on and off of the two circuits can increase the detection accuracy, and the defect can be roughly located on which side of the mesh the defect is located, thereby locating tiny defects more easily.

[0046] A plurality of air inlets 321 are evenly arranged around the air flow seat 32, and a plurality of air outlets 322 connected to the air inlets 321 are arranged at equal intervals above the air flow seat 32. A constant pressure chamber 323 is arranged in the air flow seat 32, and the constant pressure chamber 323 is connected to the air inlet 321 and the air outlet 321 respectively. The ratio of the total area of ​​the air inlet 321 to the total area of ​​the air outlet 322 is α, 1.4≤α≤1.6, and the constant pressure chamber 323 can balance the air pressure of each air outlet 322 to make the air pressure the same. During detection, a uniform airflow impacts the film so that it is subjected to the same pressure force, thereby increasing the detection accuracy. The total area of ​​the air inlet 321 and the total area of ​​the air outlet 322 need to be within the ratio range of 1.4 to 1.6, so as to ensure that the airflow intensity at the air outlet 322 meets the detection requirements (meets the critical value of the film strength). Excessive airflow intensity will damage a flawless film, and too small airflow intensity will not meet the detection requirements and cannot effectively detect defective parts.

[0047] The bottom of the sensing column 3111 is conical, and a jet pipe 3221 is provided on the air outlet 322. The jet pipe 3221 is aligned with the sensing column 3111 one by one. The jet pipe 3221 can provide a relatively concentrated airflow. After the film is damaged, if the damaged part is too small, the conductive plate 3112 may not be blown due to insufficient airflow strength. The jet pipe 3221 can increase the airflow strength. The conical design of the sensing column 3111 can effectively disperse the airflow, guide the airflow to impact the conductive plate 3112, and improve the sensing accuracy.

[0048] The detection area is subdivided into multiple small areas using the induction mesh plate 312, each of which is a small grid. If the film at that location is damaged, or the film at that location is not strong enough to be broken by the wind flowing out of the air outlet, the conductive plate 3112 will detach from the conductive sheet 3122 around the area, thereby quickly and accurately locating the damaged position of the corresponding film.

[0049] like Figure 7 As shown, the conveying mechanism 2 also includes a conveying wheel group 23, which is arranged on both sides of the frame 1. The conveying wheel group 23 includes a first conveying wheel 231 and a second conveying wheel 232. The first conveying wheel 231 and the second conveying wheel 232 are respectively arranged on the upper and lower sides of the film. The first conveying wheel 231 and the second conveying wheel 232 are suitable for conveying the film to move it toward the winding roller 22. Through the cooperation of the first conveying wheel 231 and the second conveying wheel 232, the film can be subjected to balanced force during the conveying process, thereby reducing the pulling force during the movement.

[0050] The feeding roller 21 itself does not have the ability to rotate, but can be provided with rotation damping. When the winding roller 22 and the conveying wheel group 23 convey the film, they can drive the feeding roller 21 to rotate for feeding. The rotation damping can prevent the feeding roller 21 from unfolding too much film. Force measuring modules 221 are provided at both ends of the winding roller 22. The force measuring module 221 preferably uses a pressure sensor. The force measuring module 221 is suitable for detecting the pulling force at both ends of the winding roller 22, thereby controlling the rotation speed of the conveying wheel groups 23 on both sides of the frame 1. According to the measured pulling force, the feeding speed of the conveying wheel groups 23 on both sides is adjusted. If the pulling force at the right end of the winding roller 22 is greater than that at the left end, the conveying wheel group 23 on the right side slows down its rotation speed to reduce the pulling force of the film on the right side, and vice versa. The pulling force on both sides of the film is balanced by the force measuring module 221, which can not only improve the flatness of the film wound into the winding roller 22, but also avoid the pulling caused by the different conveying speeds on both sides of the film not wound into the winding roller 22, thereby reducing the probability of film damage during transportation.

[0051] The conveying wheel group 23 is arranged around the detection mechanism 3. The conveying wheel group 23 cooperates with the film in the tensioning detection mechanism 3. The conveying wheel group 23 is arranged at the four corners of the detection structure to position and support the film, so that the force of the film when being compressed by the airflow is more balanced, avoiding damage to the film at the defect-free position due to uneven force.

[0052] like Figure 8 As shown, the marking mechanism 4 includes a guide rail 41, a motor 42, a sliding assembly 43 and a marking head 44. The guide rail 41 is horizontally arranged above the film, the sliding assembly 43 is slidably arranged on the guide rail 41, and the marking head 44 is detachably arranged on the sliding assembly 43. The marking head 44 is fixed to the sliding assembly 43 with a snap. The upper part of the marking head 44 can be connected to a paint connecting pipe and an external paint spraying device. The motor 42 is used to control the sliding of the sliding assembly 43.

[0053] The sliding assembly 43 includes a transmission wheel group 431 and a pulley 432. A connecting tooth is provided on one side of the guide rail 41. The transmission wheel group 431 is connected to the gear rack of the guide rail 41. The motor 42 controls the rotation of the transmission wheel group 431 so as to move laterally on the guide rail 41. A sliding groove 411 is provided on the other side of the guide rail 41. The pulley 432 is cooperatedly arranged in the sliding groove 411. Through the combination of the transmission wheel group 431 and the pulley 432, the stability of the marking head 44 can be enhanced, and it is not easy to shake when spraying color paint.

[0054] The marking mechanism 4 can locate the test results. When the background system gives a marking signal through calculation, the marking head 44 will spray a certain amount of color paint, which is convenient for subsequent direct observation and analysis of the damaged position of the film. Combined with the photos taken during the test by the imaging device 45, more comprehensive data can be obtained, reducing the difficulty of optimizing the production process and equipment.

[0055] like Figure 3 As shown, the marking mechanism 4 includes an imaging device 45, which is used to take photos of the film where the airflow appears, and then upload the photos to the background system for archiving. When optimizing the process and equipment, the photos can be used for analysis and comparison, and targeted optimization can be carried out to improve the optimization efficiency.

[0056] The detection device can not only detect and screen defective films, but also optimize the production process and production equipment by recording and marking the defect locations of the films, thereby reducing the number of defects in subsequently produced films.

[0057] The present application also provides a film defect detection method, the steps of which include:

[0058] The film to be tested is rolled up on the feeding roller 21, a guide film is provided at the front end of the film and connected to the winding roller 22, and the conveying wheel group 23 tensions the film in the testing mechanism 3;

[0059] The airflow seat 32 inflates the constant pressure chamber 323 through the air inlet 321, and then sprays air toward the film from the air outlet 322 through the spray pipe 3221. The airflow is suitable for passing through the defective part of the film and spraying to the sensing column 3111, so that the conductive plate 3112 and the conductive sheet 3122 are disconnected from the circuit.

[0060] The sensing station 31 obtains the position information of the circuit disconnection point, and the imaging device 45 takes pictures of the damaged position of the film for archiving;

[0061] The coiling roller 22 and the conveying wheel group 23 rotate synchronously to allow the next part of the film to be inspected to enter the inspection mechanism 3. The coiling roller 22 receives the film after inspection. The force measuring module 221 detects the pulling force at both ends of the coiling roller 22 when receiving the film, and adjusts the rotation speed of the conveying wheel group 23 on both sides of the film in real time to prevent the film from lateral displacement when moving.

[0062] The background system calculates the marking position and marking time according to the position information of the circuit disconnection and the rotation speed of the conveying wheel group 23. The sliding component 43 moves the marking head 44 to the top of the marking position in advance according to the data calculated by the background system. After the marking time, the marking head 44 sprays color paint to mark the damaged position of the film.

[0063] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A film defect detection device, characterized in that: It includes a frame, a conveying mechanism and a detection mechanism; The frame is used to support and fix the conveying mechanism and the detection mechanism; The conveying mechanism is used to convey the film to pass through the detection mechanism; The detection mechanism includes an airflow seat and a sensing platform, the airflow seat and the sensing platform are respectively arranged on both sides of the film, the airflow seat is suitable for spraying airflow to the film, the airflow is suitable for passing through the defective part of the film, and a plurality of sensing blocks are distributed on the sensing platform, the sensing blocks are suitable for sensing the airflow passing through the film and obtaining the position information of the airflow; The sensing table comprises a sensing top plate and a sensing mesh plate. The sensing top plate, the sensing mesh plate, the film and the airflow seat are sequentially arranged in the detection mechanism from top to bottom. A plurality of sensing columns are arranged at equal intervals below the sensing top plate. A conductive plate is slidably arranged at the sensing columns. A plurality of fixed mesh holes are evenly arranged on the sensing mesh plate. Conductive sheets are distributed around the fixed mesh holes. Conductive heads connected to the conductive sheets are arranged around the sensing mesh plate. The sensing columns are cooperatively installed in the fixed mesh holes. The conductive sheets are connected to the conductive sheets when they are stationary. The conductive sheets are suitable for being blown by the airflow appearing at the film defect and disconnected from the conductive sheets. The conductive plate is provided with independent conductive circuits in the longitudinal direction and the transverse direction, and the conductive circuits are suitable for connecting the conductive sheet in the longitudinal direction and the conductive sheet in the transverse direction respectively.

2. A film defect detection device according to claim 1, characterized in that: The main body shape of the conductive plate is a cross.

3. A film defect detection device according to claim 1, characterized in that: A plurality of air inlets are evenly arranged around the airflow seat, a plurality of air outlets connected to the air inlets are arranged at equal intervals above the airflow seat, a constant pressure chamber is arranged inside the airflow seat, the constant pressure chamber is connected to the air inlet and the air inlet respectively, the ratio of the total area of ​​the air inlets to the total area of ​​the air outlets is α, 1.4≤α≤1.

6.

4. A film defect detection device according to claim 3, characterized in that: The end of the sensing column is conical, and a spray pipe is arranged on the air outlet, and the spray pipe is matched with the sensing column in a one-to-one arrangement.

5. A film defect detection device according to claim 1, characterized in that: It also includes a marking mechanism, which includes a guide rail, a motor, a sliding assembly and a marking head. The guide rail is laterally arranged above the film on the discharge side of the detection mechanism. The sliding assembly is slidably arranged on the guide rail. The marking head is detachably arranged on the sliding assembly. The motor is used to control the sliding of the sliding assembly. The sliding assembly includes a transmission wheel group and a pulley. Connecting teeth are arranged on one side of the guide rail, and the transmission wheel group is connected to the guide rail gear rack. A sliding groove is arranged on the other side of the guide rail. The pulley is arranged in the sliding groove and cooperates with the transmission wheel group to clamp the guide rail.

6. A film defect detection device according to claim 5, characterized in that: The marking mechanism further comprises an imaging device, which is arranged in the detection mechanism and is used to take a photo of the film where the airflow appears.

7. A film defect detection device according to claim 1, characterized in that: The conveying mechanism includes a feed roller, a winding roller and a conveying wheel group, the feed roller and the winding roller are arranged at both ends of the frame, the conveying wheel group is arranged on both sides of the frame, the conveying wheel group includes a first conveying wheel and a second conveying wheel, the first conveying wheel and the second conveying wheel cooperate to clamp the film, and the first conveying wheel and the second conveying wheel are suitable for moving the film toward the winding roller.

8. A film defect detection device according to claim 7, characterized in that: The conveying wheel group is arranged around the detection mechanism, and the conveying wheel group cooperates to tension the film in the detection mechanism. Force measuring modules are arranged at both ends of the winding roller, and the force measuring modules are suitable for detecting the pulling force at both ends of the winding roller, thereby controlling the rotation speed of the conveying wheel group on both sides of the frame.

9. A film defect detection method, characterized in that: Includes steps: The film to be tested is rolled up on the feeding roller, a guide film is provided at the front end of the film to connect with the winding roller, and the conveying wheel group tensions the film in the testing mechanism; The airflow seat inflates the constant pressure chamber through the air inlet, and then sprays air to the film through the air outlet through the spray pipe. The airflow is suitable for passing through the defective part of the film and spraying to the sensing column, so that the conductive plate and the conductive sheet are disconnected from the circuit. The induction table obtains the location information of the circuit disconnection point, and the imaging device takes pictures of the damaged position of the film for archiving; The coiling roller and the conveying wheel group rotate synchronously to allow the next part of the film to be inspected to enter the inspection mechanism. The coiling roller receives the film after inspection. The force measuring module detects the pulling force at both ends of the coiling roller when receiving the film, and adjusts the rotation speed of the conveying wheel group on both sides of the film in real time to prevent the film from lateral displacement when moving. The background system calculates the marking position and marking time through the position information of the circuit disconnection point and the rotation speed of the conveying wheel group. The sliding component moves the marking head above the marking position in advance according to the data calculated by the background system. After the marking time, the marking head sprays color paint to mark the damaged position of the film.

Images