An automatic defect detection device for a film production line

Abstract

The present invention relates to the field of film detection technology, and in particular to an automated defect detection device for a film production line, comprising a detection frame, a visual detection mechanism for detecting film defects is provided on the detection frame, a pair of tensioning conveyor frames are provided on both sides of the detection frame, a fixed frame is fixedly connected to the inner side of the detection frame, and a pair of conveyor rollers are rotatably connected to the inner side of the fixed frame. The present invention is configured with structures such as a chain, a following mechanism and a moving mechanism, so that when the visual detection mechanism finds defects on the film, the marker pen is driven to move above the film and the main insertion rod is inserted into the chain at the same time. Since the chain is driven by the conveyor roller, and the conveyor roller is mainly used to control the conveying speed of the film, and the conveying speed of the chain and the film is the same, the sliding frame and the marker pen can move with the film, and finally the marker pen is driven to draw circles on the film, thereby achieving accurate marking of the film defects.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film detection, and in particular to an automatic defect detection device for a thin film production line. Background Art

[0002] During the production of food and pharmaceutical packaging films, film quality is directly related to the safety and effectiveness of the products. However, due to factors such as uneven raw materials, equipment wear, and fluctuations in process parameters, various defects such as holes, scratches, wrinkles, and black spots are prone to appear on the film surface. These defects not only affect the appearance of the film, but also have adverse effects on its barrier properties and mechanical properties, which may threaten the freshness and taste of food as well as the stability and safety of medicines. Therefore, timely and accurate detection and marking of defect locations in the film are crucial to ensuring product quality and production efficiency.

[0003] Although existing automated defect detection devices have improved detection efficiency and accuracy to a certain extent, there are still some shortcomings in defect marking. For example, some devices use inkjet marking. Although automatic marking can be achieved, the inkjet system is prone to problems such as clogging and ink drying, and the ink may contaminate the surface of the film, affecting the performance of the film. Other devices use marking machines for automatic labeling. This method requires additional label materials, increases production costs, and the labeling process may cause secondary damage to the film. Some devices only display defect information through sound and light alarms or system interfaces, and cannot mark directly on the film, which is not convenient for subsequent repair and processing.

[0004] Therefore, an automatic defect detection device for a film production line is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an automatic defect detection device for a film production line.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: an automated defect detection device for a film production line, comprising an inspection frame, the inspection frame is provided with a visual inspection mechanism for detecting film defects, a pair of tensioning conveying frames are provided on both sides of the inspection frame, the inspection frame is fixedly connected to a fixed frame on the inner side of the inspection frame, a pair of conveying rollers are rotatably connected to the inner side of the fixed frame, and both sides of the conveying roller located above are fixedly connected to a driving sprocket through the outer wall of the fixed frame, one of the transmission rollers on the tensioning conveying frame is fixedly connected to a pair of driven sprockets on the outer wall, a chain is connected between the driving sprocket and the driven sprocket, the side wall of the inspection frame is obliquely fixedly connected to a top plate, a bottom platform is provided under the top plate, a lifting plate is provided under the top plate, a sliding frame is provided at the bottom end of the lifting plate, a moving frame is slidably connected to the inner side of the sliding frame, a disc is rotatably connected to the bottom end of the disc, a marking pen is detachably provided, a following mechanism for following the movement of the film is provided on both sides of the sliding frame, and a moving mechanism for driving the marking pen to move is also provided.

[0007] In the above technical solution, further, the top of the base is tilted, and the inclined surface of the top of the base has the same inclination angle as the top plate, a drive motor is fixedly connected to the inner side of the detection frame, and the output end of the drive motor is fixedly connected to one of the side walls of the drive sprocket.

[0008] In the above technical solution, further, the moving mechanism includes a moving motor, three upper electric telescopic cylinders are fixedly connected to the top of the top plate, the output ends of the three upper electric telescopic cylinders pass through the bottom end of the top plate and are fixedly connected to the top of the lifting plate, the moving motor is fixedly connected to the inner side of the sliding frame, the inner side of the sliding frame is rotatably connected to a threaded rod, the output end of the moving motor is fixedly connected to the side wall of the threaded rod, and the threaded rod is threaded through and connected to the inner wall of the moving frame.

[0009] In the above technical solution, further, a rotating motor is fixedly connected to the inner side of the moving frame, and an output end of the rotating motor is fixedly connected to the top end of the disc.

[0010] In the above technical solution, further, the following mechanism includes a main plug rod, both sides of the lifting plate are slidably connected with a follower frame, the inner side of the follower frame is slidably connected with a cross frame, and the cross frames are fixedly connected to the outer walls of the sliding frame. A pair of main plug rods are provided, and both sides of the bottom end of the main plug rod are inclined. The inner side of the cross frame is laterally slidably connected with a telescopic cylinder, and the main plug rods are longitudinally slidably connected to the inner side of the telescopic cylinder. A pair of upper springs are fixedly connected between the outer sides of the telescopic cylinder and the inner side of the cross frame, the four corners of the top of the lifting plate are fixedly connected with side plates, and the side plate away from the conveying roller is fixedly connected to the outer wall of the following frame with a lower spring.

[0011] In the above technical solution, further, a secondary rod is longitudinally slidably connected to the inner side of the follower frame and away from the side of the main rod, and the bottom ends of the secondary rod are tilted on both sides, and a return spring is fixedly connected between the outer wall of the secondary rod and the top end of the follower frame. A through groove is provided on the side wall of the telescopic cylinder, an upper groove is provided on the side wall of the main rod, and the top end of the upper groove is tilted, a lower groove is provided on the side wall of the secondary rod, and the bottom end of the lower groove is tilted, an extrusion rod is provided between the upper groove and the lower groove, and the side end of the extrusion rod is set to a smooth arc surface, an adjustable electric telescopic cylinder is fixedly connected to the outer wall of the follower frame, the output end of the adjustable electric telescopic cylinder passes through the inner side of the follower frame and is fixedly connected to the side wall of the extrusion rod, and a positioning spring is fixedly connected between the top end of the telescopic cylinder and the top end of the main rod.

[0012] In the above technical solution, further, the side wall of the follower frame is fixedly connected with a lower electric telescopic cylinder, and the output end of the lower electric telescopic cylinder is set through the inner side of the follower frame, and a magnet is fixedly connected through the inner side of the follower frame and close to the side of the horizontal frame, and the horizontal frame is made of iron.

[0013] In the above technical solution, further, a touch sensor is fixedly connected to the inner side of the following frame, and the touch sensor is electrically connected to the lower electric telescopic cylinder through the controller.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention, through the arrangement of structures such as a chain, a following mechanism and a moving mechanism, can drive the marking pen to move above the film when the visual inspection mechanism finds defects on the film, and at the same time insert the main insertion rod into the chain. Since the chain is driven by a conveyor roller, and the conveyor roller is mainly used to control the conveying speed of the film, the conveying speed of the chain and the film is the same, so that the sliding frame and the marking pen can move with the film, and finally drive the marking pen to draw circles on the film, thereby achieving accurate marking of the defects in the film.

[0016] 2. By adjusting the settings of the electric telescopic cylinder, the lower electric telescopic cylinder, the extrusion rod and other structures, the present invention can, during the marking process, when the visual inspection mechanism detects that there are defect points at subsequent positions close to the previous defect, and the marker pen cannot be quickly reset for marking, insert the secondary rod into the chain to follow the movement, and at the same time pull out the main rod, and then the lower electric telescopic cylinder pushes the sliding frame and the marker forward, and then inserts the main rod and pulls out the secondary rod, and the marker can be moved forward to mark the defect position in front, ensuring rapid marking of defects at close distances. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the detection device of the present invention from a top view;

[0018] Figure 2 This is a schematic diagram of the front full-section three-dimensional structure of the detection device of the present invention;

[0019] Figure 3 This is a schematic diagram of the side three-dimensional structure of the detection frame of the present invention;

[0020] Figure 4 This is a bottom-up perspective structural diagram of the base, lifting plate, and chain of the present invention;

[0021] Figure 5 The appended Figure 4 A schematic diagram of the partially enlarged structure at center A;

[0022] Figure 6 This is a schematic diagram of a partial bottom-up three-dimensional structure of the lifting plate of the present invention;

[0023] Figure 7 It is a schematic diagram of the partial three-dimensional structure of the following frame and the sliding frame when the following frame is opened;

[0024] Figure 8 This is a schematic diagram of the full-section side three-dimensional structure of the follower frame of the present invention;

[0025] Figure 9 It is a schematic diagram of the separated three-dimensional structure of the moving frame and the rotating motor of the present invention;

[0026] Figure 10 This is a schematic diagram of the overall appearance and structure of the main insertion rod, secondary insertion rod and adjustable electric telescopic cylinder of the present invention.

[0027] In the figure: 1. Detection frame; 2. Visual inspection mechanism; 3. Tensioning conveyor frame; 4. Fixed frame; 5. Conveyor roller; 6. Driving sprocket; 7. Driven sprocket; 8. Chain; 9. Top plate; 10. Bottom platform; 11. Lifting plate; 12. Sliding frame; 13. Moving frame; 14. Disc; 15. Marking pen; 16. Driving motor; 17. Moving motor; 18. Threaded rod; 19. Rotating motor; 20. Main insertion rod; 21. Following frame; 22. Horizontal frame; 23. Upper spring; 24. Side plate; 25. Lower spring; 26. Secondary insertion rod; 27. Reset spring; 28. Upper slot; 29. ​​Lower slot; 30. Extrusion rod; 31. Adjusting electric telescopic cylinder; 32. Lower electric telescopic cylinder; 33. Magnet; 34. Telescopic cylinder; 35. Touch sensor; 36. Upper electric telescopic cylinder; 37. Positioning spring. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In actual use, it was found that some devices use inkjet marking. Although automatic marking can be achieved, the inkjet system is prone to problems such as clogging and ink drying, and the ink may contaminate the surface of the film, affecting the performance of the film. Other devices use marking machines for automatic labeling. This method requires additional label materials, increases production costs, and the labeling process may cause secondary damage to the film. Some devices only display defect information through sound and light alarms or system interfaces, and cannot mark directly on the film, which is not convenient for subsequent repair and processing. In order to solve the above problems, the following structure is specially invented.

[0031] like Figures 1-10 An automated defect detection device for a film production line is shown, comprising a detection frame 1, on which is provided a visual detection mechanism 2 for detecting film defects. The visual detection mechanism 2 primarily uses a high-brightness LED linear concentrated cold light source to illuminate the production line surface. For film materials with high light transmittance, the light source is located below the film, and the camera is located above the film to capture images. Transmitted light is used to detect defects on the film surface, and the image information on the film surface is subsequently converted into an electrical signal and transmitted to an image processing system. After receiving the image signal transmitted by the linear array camera, the image processing system converts the image into a digital signal based on pixel distribution, brightness, color, and other information. The processor uses different algorithms to process the digitized image and extract key features of the image, such as position, quantity, area, length, shape, and the like. These features are then analyzed and judged based on preset conditions and tolerances to determine whether a defect exists, as well as information such as the size, position, and type of the defect.

[0032] A pair of tensioning conveying frames 3 are provided on both sides of the detection frame 1. The inner side of the detection frame 1 is fixedly connected to a fixed frame 4. The inner side of the fixed frame 4 is rotatably connected to a pair of conveying rollers 5. Both sides of the conveying rollers 5 located above are fixedly connected to the outer wall of the fixed frame 4 with a driving sprocket 6. The outer wall of the transmission roller on one of the tensioning conveying frames 3 is fixedly connected to a pair of driven sprockets 7. A chain 8 is connected between the driving sprocket 6 and the driven sprocket 7 for transmission. The side wall of the detection frame 1 is tilted and fixedly connected to a top plate 9. A bottom platform 10 is provided below the top plate 9. The setting of the bottom platform 10 facilitates the limiting effect on the bottom end of the film, which facilitates the marking of the marker 15 on the film. A lifting plate 11 is provided below the top plate 9. A sliding frame 12 is provided at the bottom end of the lifting plate 11. A moving frame 13 is slidably connected to the inner side of the sliding frame 12. The bottom end of the frame 13 is rotatably connected to a disc 14, and the bottom end of the disc 14 is detachably provided with a marker 15. It should be noted that the marker 15 is fixed at the eccentric position of the bottom end of the disc 14, and the rotation of the disc 14 can drive the marker 15 to draw a circle mark. At the same time, the marker 15 uses a water-based marker, which is environmentally friendly and pollution-free, and is suitable for production environments with high environmental protection requirements. At the same time, it has a fast drying speed and is suitable for marking film defects with high environmental protection requirements, such as food packaging films, medical packaging films, etc. Both sides of the sliding frame 12 are provided with a following mechanism for following the movement of the film, and a moving mechanism for driving the marker 15 to move. At the same time, the arrangement of the base 10 facilitates the limiting effect on the bottom end of the film, so that the marker 15 can mark on the film.

[0033] The top of the base 10 is tilted, and the inclined surface of the top of the base 10 has the same inclination angle as the top plate 9. A drive motor 16 is fixedly connected to the inner side of the detection frame 1, and the output end of the drive motor 16 is fixedly connected to the side wall of one of the drive sprockets 6.

[0034] The moving mechanism includes a moving motor 17. Three upper electric telescopic cylinders 36 are fixedly connected to the top of the top plate 9. The output ends of the three upper electric telescopic cylinders 36 pass through the bottom end of the top plate 9 and are fixedly connected to the top of the lifting plate 11. The moving motor 17 is fixedly connected to the inner side of the sliding frame 12. The inner side of the sliding frame 12 is rotatably connected to a threaded rod 18. The output end of the moving motor 17 is fixedly connected to the side wall of the threaded rod 18, and the threaded rod 18 is threadedly connected to the inner wall of the moving frame 13. It should be noted that a grating ruler can be provided on the moving mechanism to ensure that the moving frame 13 is accurately moved to the defect position for marking under system control;

[0035] A rotating motor 19 is fixedly connected to the inner side of the moving frame 13. The output end of the rotating motor 19 is fixedly connected to the top of the disc 14. The disc 14 is driven to rotate by the rotating motor 19.

[0036] The following mechanism includes a main insertion rod 20, and both sides of the lifting plate 11 are slidably connected to the following frame 21, and the inner side of the following frame 21 is slidably connected to the transverse frame 22, and the transverse frame 22 is fixedly connected to the outer wall of the sliding frame 12. A pair of main insertion rods 20 are provided, and both sides of the bottom end of the main insertion rod 20 are inclined. The inner side of the transverse frame 22 is horizontally slidably connected to the telescopic cylinder 34, and the main insertion rods 20 are longitudinally slidably connected to the inner side of the telescopic cylinder 34. A pair of upper springs 23 are fixedly connected between the outer walls of the telescopic cylinder 34 and the inner side of the transverse frame 22. The four corners of the top of the lifting plate 11 are fixedly connected to the side plates 24, and the side plates 24 away from the conveying roller 5 are fixedly connected to the outer wall of the following frame 21. A lower spring 25 is fixedly connected;

[0037] In the process of detecting film defects, the film is first passed through the tensioning conveyor frame 3 and passed between the conveying rollers 5, and then passed through another set of tensioning conveyor frames 3 to be wound onto the winding device. Then the visual inspection mechanism 2 can be controlled to start defect detection on the film, and at the same time the drive motor 16 is controlled to start driving the conveying roller 5 and the driving sprocket 6 to rotate, and at the same time the driven sprocket 7 is driven to rotate under the transmission of the chain 8. Then, when the visual inspection mechanism 2 detects that there is a defect in the film, the controller controls the upper electric telescopic cylinder 36 to start driving the lifting plate 11 to move downward, and at the same time The following frame 21, the sliding frame 12, the moving frame 13 and the marking pen 15 are driven to move downward, and the main insertion rod 20 is driven to move above the chain 8. Then the main insertion rod 20 is inserted into the chain 8. During this process, if the main insertion rod 20 is not aligned with the hole on the chain 8, the inclined surface of the main insertion rod 20 will be pushed under the pressure of the chain 8, so that the main insertion rod 20 and the telescopic cylinder 34 slide in the horizontal frame 22, and the upper springs 23 on both sides are compressed and stretched. Then, under pressure, the bottom end of the main insertion rod 20 is inserted into the hole of the chain 8. At this time, the marking pen 15 also moves to the film.

[0038] During this process, the controller will control the moving motor 17 to start and drive the threaded rod 18 to rotate, thereby driving the threaded moving frame 13 to slide in the sliding frame 12, and driving the marking pen 15 to move, so that the marking pen 15 moves to the top of the defect position in advance, and then in the process of the chain 8 driving the main insertion rod 20, the following frame 21 and the sliding frame 12 to move on the lifting plate 11, the rotating motor 19 is controlled to start and drive the disc 14 to rotate, thereby driving the marking pen 15 to rotate, marking the defective part of the film, and gradually compressing the lower spring 25. Finally, after the marking is completed, the upper electric telescopic cylinder 36 is controlled to start resetting, and at the same time drive the main insertion rod 20 to be pulled out of the hole in the chain 8, and finally release the squeeze on the sliding frame 12, and push the following frame 21 to reset under the elastic force of the lower spring 25.

[0039] It should be noted here that when the visual inspection mechanism 2 detects a defect, the system controls the upper electric telescopic cylinder 36 to start driving the lifting plate 11 downward, so that the marker 15 moves to the film, and then the chain 8 pushes the main insertion rod 20 to compress the upper spring 23 on one side to drive the horizontal frame 22 to move. The time can be calculated, and there will be errors in the middle, which can be ignored. Because the cutting range of the subsequent film defect is very large, the design allows errors, so that the marker 15 is set at the corresponding position, so as to ensure that when the defect position is transmitted to the bottom of the marker 15, the marker 15 pokes next to the film defect, and the sliding frame 12 moves following the chain 8.

[0040] To sum up, through the design of the above structure, when the visual inspection mechanism 2 finds defects on the film, it can drive the marker 15 to move above the film, and at the same time insert the main insertion rod 20 into the chain 8. Since the chain 8 is driven by the conveying roller 5, and the conveying roller 5 is mainly used to control the conveying speed of the film, the conveying speed of the chain 8 is the same as that of the film, so that the sliding frame 12 and the marker 15 can move with the film, and finally drive the marker 15 to draw a circle mark on the film, thereby achieving accurate marking of the defects in the film.

[0041] Based on the above embodiment, it was found during use that if there is a defect near the film defect position, the sliding frame 12 cannot be quickly reset to perform the next marking operation, thereby affecting the normal operation of the device. In order to solve the above problem, the above structure was further improved.

[0042] A secondary plug rod 26 is longitudinally slidably connected to the inner side of the follower frame 21 and away from the side of the main plug rod 20, and the bottom ends of the secondary plug rod 26 are inclined on both sides. A return spring 27 is fixedly connected between the outer wall of the secondary plug rod 26 and the inner top of the follower frame 21. A through groove is provided on the side wall of the telescopic cylinder 34, and an upper groove 28 is provided on the side wall of the main plug rod 20, and the top end of the upper groove 28 is inclined. A lower groove 29 is provided on the side wall of the secondary plug rod 26, and the bottom end of the lower groove 29 is inclined. An extrusion rod 30 is provided between the upper groove 28 and the lower groove 29, and the side end of the extrusion rod 30 is set to a smooth arc surface. An adjusting electric telescopic cylinder 31 is fixedly connected to the outer wall of the follower frame 21, and the output end of the adjusting electric telescopic cylinder 31 passes through the inner side of the follower frame 21 and is fixedly connected to the side wall of the extrusion rod 30. A positioning spring 37 is fixedly connected between the inner top of the telescopic cylinder 34 and the top of the main plug rod 20.

[0043] The side wall of the follower frame 21 is fixedly connected to a lower electric telescopic cylinder 32, and the output end of the lower electric telescopic cylinder 32 is set through the inner side of the follower frame 21. A magnet 33 is fixedly connected to the inner side of the follower frame 21 and close to the side of the horizontal frame 22. The horizontal frame 22 is made of iron.

[0044] A touch sensor 35 is fixedly connected to the inner side of the following frame 21. The touch sensor 35 is electrically connected to the lower electric telescopic cylinder 32 through the controller. Due to the configuration of the touch sensor 35, when the horizontal frame 22 moves to the other side of the following frame 21, it touches the touch sensor 35. Then, the touch sensor 35 transmits a signal to the controller, which controls the lower electric telescopic cylinder 32 to quickly reset.

[0045] The control unit 31 is configured to adjust the electric telescopic cylinder 31 so as to start under a specified condition. The specified condition is that the distance between the two defects is too close and the sliding frame 12 cannot be reset. The controller will control the electric telescopic cylinder 31 to start, thereby driving the squeezing rod 30 to move. The arc surface of the squeezing rod 30 squeezes the inclined surface of the upper groove 28, so that the main insertion rod 20 slides upward in the telescopic cylinder 34, and at the same time compresses the positioning spring 37. At the same time, through the sliding of the squeezing rod 30, the arc surface of the squeezing rod 30 squeezes the inclined surface of the lower groove 29, so that the secondary insertion rod 26 is inserted into the hole of the chain 8 (it should be noted that the position between the main insertion rod 20 and the secondary insertion rod 26 is fixed, and the distance between each hole of the chain 8 is also fixed. Therefore, when the main insertion rod 20 is inserted, the secondary insertion rod 26 can be directly inserted into the hole of the chain 8 without deviation), and compresses the reset spring 27, so that the sliding frame 12 is in a released squeeze state at this time.

[0046] During this process, the controller needs to control the upper electric telescopic cylinder 36 to start, drive the lifting plate 11 to move up a part, lift the marker 15 from the film, but will not pull the secondary insertion rod 26 out of the chain 8, and then control the moving motor 17 to start changing the position of the marker 15. If no change is required, no manipulation is required, and then the following frame 21 will continue to move with the chain 8, and then control the lower electric telescopic cylinder 32 to start pushing the horizontal frame 22 to move, so that the horizontal frame 22 moves away from the magnet 33, and drives the sliding frame 12 to move, thereby pushing the marker 15 forward, so that the marker 15 moves to the defect, and then control The control and adjustment electric telescopic cylinder 31 starts to retract, thereby releasing the squeezing on the upper slot 28 and the lower slot 29, and pushing the main insertion rod 20 into the hole of the chain 8 under the elastic force of the positioning spring 37. At the same time, the horizontal frame 22 touches the touch sensor 35, and the controller controls the lower electric telescopic cylinder 32 to quickly reset. Finally, the rotary motor 19 can be controlled to start marking the defect. In this process, when the secondary insertion rod 26 is pulled out from the chain 8, the thrust on the follower frame 21 will be released, and then the follower frame 21 will be pushed to move to the side of the horizontal frame 22 under the elastic force of the lower spring 25. The horizontal frame 22 is adsorbed by the magnet 33 and continues to move following the horizontal frame 22.

[0047] To sum up, through the design of the above structure, during the marking process, when the visual inspection mechanism 2 detects that there are defect points at the subsequent similar positions of the previous defect, and the marker 15 cannot be quickly reset for marking, the secondary insertion rod 26 is inserted into the chain 8 to follow the movement, and the main insertion rod 20 is pulled out at the same time. Then the lower electric telescopic cylinder 32 pushes the sliding frame 12 and the marker 15 forward, and then the main insertion rod 20 is inserted and the secondary insertion rod 26 is pulled out, and the marker 15 can be moved forward to mark the defect position in front, ensuring the rapid marking of defects with similar distances and avoiding the phenomenon of missing marks.

[0048] The basic principles, main features and advantages of the present invention are shown and described above.

[0049] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An automated defect detection device for a film production line, comprising a detection frame (1), wherein the detection frame (1) is provided with a visual detection mechanism (2) for detecting film defects, and wherein: A pair of tensioning conveying frames (3) are provided on both sides of the detection frame (1), a fixed frame (4) is fixedly connected to the inner side of the detection frame (1), a pair of conveying rollers (5) are rotatably connected to the inner side of the fixed frame (4), and both sides of the conveying rollers (5) located above pass through the outer wall of the fixed frame (4) and are fixedly connected to driving sprockets (6), one of the outer walls of the transmission rollers on the tensioning conveying frame (3) is fixedly connected to a pair of driven sprockets (7), and a chain (8) is connected between the driving sprocket (6) and the driven sprocket (7), and the side wall of the detection frame (1) is tilted and fixed. A top plate (9) is connected, a bottom platform (10) is provided below the top plate (9), a lifting plate (11) is provided below the top plate (9), a sliding frame (12) is provided at the bottom end of the lifting plate (11), a moving frame (13) is slidably connected to the inside of the sliding frame (12), a disc (14) is rotatably connected to the bottom end of the moving frame (13), a marking pen (15) is detachably provided at the bottom end of the disc (14), a following mechanism for following the movement of the film is provided on both sides of the sliding frame (12), and a moving mechanism for driving the marking pen (15) to move; The following mechanism includes a main plug rod (20), both sides of the lifting plate (11) are slidably connected to a following frame (21), the inner side of the following frame (21) is slidably connected to a transverse frame (22), and the transverse frame (22) is fixedly connected to both sides of the outer wall of the sliding frame (12). The main plug rod (20) is provided with a pair, both sides of the bottom end of the main plug rod (20) are tilted, the inner side of the transverse frame (22) is transversely slidably connected to a telescopic cylinder (34), the main plug rod (20) is longitudinally slidably connected to the inner side of the telescopic cylinder (34), a pair of upper springs (23) are fixedly connected between both sides of the outer wall of the telescopic cylinder (34) and the inner side of the transverse frame (22), the four corners of the top of the lifting plate (11) are fixedly connected to side plates (24), and the side plate (24) away from the conveying roller (5) is fixedly connected to the outer wall of the following frame (21) with a lower spring (25); A secondary plug rod (26) is longitudinally slidably connected to the inner side of the following frame (21) and away from the side of the main plug rod (20), and the bottom ends of the secondary plug rod (26) are inclined at both sides, and a return spring (27) is fixedly connected between the outer wall of the secondary plug rod (26) and the top end of the following frame (21), the side wall of the telescopic cylinder (34) is provided with a through groove, the side wall of the main plug rod (20) is provided with an upper groove (28), and the top end of the upper groove (28) is inclined, and the side wall of the secondary plug rod (26) is provided with a lower groove (29), and The bottom end of the lower groove (29) is tilted, and an extrusion rod (30) is provided between the upper groove (28) and the lower groove (29). The side end of the extrusion rod (30) is provided as a smooth arc surface. The outer wall of the following frame (21) is fixedly connected with an adjustable electric telescopic cylinder (31). The output end of the adjustable electric telescopic cylinder (31) passes through the inner side of the following frame (21) and is fixedly connected to the side wall of the extrusion rod (30). A positioning spring (37) is fixedly connected between the inner top end of the telescopic cylinder (34) and the top end of the main insertion rod (20). A lower electric telescopic cylinder (32) is fixedly connected to the side wall of the following frame (21), and an output end of the lower electric telescopic cylinder (32) is arranged through the inner side of the following frame (21). A magnet (33) is fixedly connected through the inner side of the following frame (21) and close to the side of the horizontal frame (22). The horizontal frame (22) is made of iron.

2. The automatic defect detection device for a film production line according to claim 1, characterized in that: The top of the base (10) is tilted, and the inclined surface of the top of the base (10) has the same tilt angle as the top plate (9). A driving motor (16) is fixedly connected to the inner side of the detection frame (1), and the output end of the driving motor (16) is fixedly connected to the side wall of one of the driving sprockets (6).

3. The automatic defect detection device for a film production line according to claim 1, characterized in that: The moving mechanism includes a moving motor (17), three upper electric telescopic cylinders (36) are fixedly connected to the top of the top plate (9), the output ends of the three upper electric telescopic cylinders (36) pass through the bottom of the top plate (9) and are fixedly connected to the top of the lifting plate (11), the moving motor (17) is fixedly connected to the inner side of the sliding frame (12), the inner side of the sliding frame (12) is rotatably connected to a threaded rod (18), the output end of the moving motor (17) is fixedly connected to the side wall of the threaded rod (18), and the threaded rod (18) passes through and is threadedly connected to the inner side wall of the moving frame (13).

4. The automatic defect detection device for a film production line according to claim 1, characterized in that: A rotating motor (19) is fixedly connected to the inner side of the moving frame (13), and an output end of the rotating motor (19) is fixedly connected to the top end of the disc (14).

5. The automatic defect detection device for a film production line according to claim 1, characterized in that: A touch sensor (35) is fixedly connected to the inner side of the following frame (21), and the touch sensor (35) is electrically connected to the lower electric telescopic cylinder (32) via a controller.

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