Plastic film defect detection device

Abstract

The present invention relates to a plastic film defect detection device in the field of detection equipment. The device is provided with a fixed clamping component and a movable clamping component to tension the intermittently conveyed plastic film section by section, replacing the floating roller tensioning method used in traditional film detection devices. This reduces film vibration and motion artifacts during continuous film transmission and shooting, so that the photographed plastic film has better flatness, improves the quality of the shot image, and thus improves the accuracy of defect detection. At the same time, the fixed clamping component and the movable clamping component are used to clamp and fix the two ends of the film to be inspected, thereby reducing the probability that the tear after the film is tensioned and torn will extend to the non-inspection part of the film, and reducing the amount of plastic film waste generated during detection. In addition, the cutting component and the secondary feeding mechanism are used to achieve the removal of the unqualified part of the film and the secondary feeding of the part to be inspected.

Description

Technical Field

[0001] The present invention relates to a film detection device, in particular to a plastic film defect detection device applied in the field of detection equipment. Background Art

[0002] In the production process of plastic films, to ensure product quality control, high-resolution industrial cameras are required to be used in conjunction with machine vision inspection systems to implement online defect identification. In the key process link, the floating roller mechanical tensioning device implements real-time tension adjustment on the moving film through dynamic extrusion to maintain the flatness of the film surface. However, the existing tensioning mechanism has significant technical defects: when the film fails due to longitudinal tearing, the continuously applied mechanical constraint force will cause the crack to produce a stress concentration effect along the direction of film travel, thereby inducing uncontrollable tear expansion, ultimately causing continuous film breakage and generating a large amount of unplanned waste.

[0003] The existing patent with publication number CN113376330B discloses a plastic film detection device, including a detection box, a controller on the outside of the detection box, the controller is connected to the detection box, the outside of the detection box is also provided with an adjustment motor, the adjustment motor is connected to the detection box, the output end of the adjustment motor is provided with an adjustment disk, the adjustment disk is connected to the output end of the adjustment motor, the outside of the adjustment disk is provided with an adjustment rod, the adjustment rod is connected to the adjustment disk, and one end of the adjustment rod is provided with a push rod. The plastic film detection device provided by the present invention can facilitate the detection of plastic film, and compared with ordinary inspection devices, the detection device provided by the present invention has the advantages of assisting film transmission, avoiding film stretching, being able to inspect film defects, and being able to facilitate adjustment of the position of the detection sensor.

[0004] The above-mentioned prior art discloses that the detection device has the effect of assisting film transmission and preventing film stretching, but does not solve the problem that when the film is torn during the detection process, the tear is likely to expand and form a large amount of waste. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the tensioning device of the existing plastic film detection device is prone to cause the tear to expand and form a large amount of film waste when the film is torn.

[0006] In order to solve the above problems, the present invention provides a plastic film defect detection device, comprising a base and a support plate vertically fixedly connected to the base, a winding mechanism and a release mechanism of a film roll fixedly sleeved on the outer end are fixedly connected to the support plate, a tensioning detection mechanism is provided between the release mechanism and the winding mechanism, the tensioning detection mechanism comprises a fixed clamping assembly and a movable clamping assembly arranged in a mirror image, the fixed clamping assembly and the movable clamping assembly have the same structure, the movable clamping assembly comprises a mounting frame, a pair of clamping blocks symmetrically arranged up and down and distributed on the upper and lower sides of the plastic film are slidably connected in the mounting frame, the pair of clamping blocks are threadedly connected to the same first bidirectional screw rod, and the first bidirectional screw rod is connected to a first motor;

[0007] The fixed clamping assembly is fixedly connected to the support plate, and the mobile clamping assembly is connected to a tensioning mechanism that drives it to move laterally. The tensioning mechanism includes a sliding block fixedly connected to the mounting frame, a mobile cylinder is slidably sleeved on the outer side of the sliding block, a pressure sensor is fixedly connected inside the mobile cylinder, a spring abuts between the pressure sensor and the sliding block, the outer end of the mobile cylinder is fixedly connected to the movable end of the electric push rod, and the fixed end of the electric push rod is fixedly connected to the support plate;

[0008] An industrial camera located above the plastic film is provided between the fixed clamping assembly and the movable clamping assembly. The industrial camera is fixedly connected to the support plate through a fixed rod. The industrial camera is electrically connected to a controller. The controller is equipped with a defect recognition system. The defect recognition system includes an image acquisition module and a defect recognition module. The input end of the image acquisition module is connected to the industrial camera. The defect recognition module recognizes defects on the film based on the captured image acquired by the image acquisition module.

[0009] In the above-mentioned plastic film defect detection device, the plastic film to be photographed and detected is clamped and tensioned section by section by the fixed clamping assembly and the movable clamping assembly.

[0010] As a further improvement of the present application, a cutting assembly is provided in the clamping block, and the cutting assembly includes a cutting knife arranged in the clamping block, the cutting knife is fixedly connected to a clamping frame, the clamping frame is slidably clamped to an eccentric groove roller, and the front end of the eccentric groove roller is fixedly connected to the output shaft of the second motor; the output shaft of the second motor drives the eccentric groove roller to rotate, the eccentric groove roller drives the clamping frame to move up and down, and the clamping frame drives the cutting knife to move up and down to cut the defective film; a waste box is provided between the fixed clamping assembly and the movable clamping assembly and is located below the plastic film.

[0011] As a further improvement of the present application, the secondary feeding mechanism is further included, the secondary feeding mechanism including a third clamping assembly and a transverse screw module for driving the third clamping assembly to move transversely; the third clamping assembly includes a pair of first clamping bars arranged in an upper and lower mirror image and a second screw drive mechanism for driving the pair of first clamping bars to move synchronously;

[0012] The winding mechanism includes a winding assembly, which includes a winding roller, the winding roller is fixedly connected to a winding seat, the winding seat is fixedly connected to the output shaft of a fourth motor, and the fourth motor drives the winding seat and the winding roller thereon to rotate and wind the plastic film; the winding roller is provided with an open groove, and a pair of second clamping strips abutting each other are nested inside the open groove, the second clamping strip is fixedly connected to a leaf spring, and the outer end of the leaf spring is fixedly connected to the inner wall of the open groove; both the first clamping strip and the second clamping strip are long strips with an isosceles trapezoidal cross-section.

[0013] As a further improvement of the present application, the cutting knife is a strip-shaped blade with an inverted triangular cross-section, the eccentric groove roller is a longitudinally arranged circular roller structure, and an annular groove is provided at the center position, and eccentric circular grooves are provided on the front and rear end faces of the eccentric groove roller and the inner end faces on both sides of the annular groove. A plurality of sliding columns are fixedly connected to the clamping frame, and the sliding columns slide and abut against the inner wall of the eccentric circular groove. A accommodating cavity for accommodating the eccentric groove roller, the clamping frame and the cutting knife is provided in the clamping block.

[0014] As a further improvement of the present application, a cutting groove arranged opposite to the cutting blade is provided in the clamping block on the side away from the cutting blade.

[0015] As a further improvement of the present application, the movable cylinder is a horizontally arranged hollow cylinder, and the sliding block includes a cylindrical portion that is slidably nested in the movable cylinder and a block portion that is fixedly connected to the cylindrical portion and extends to the outside of the movable cylinder. The outer end of the block portion is fixedly connected to the mounting frame of the movable clamping assembly, and the outer wall of the movable cylinder is provided with a transverse sliding groove for the block portion to slide transversely, and the transverse sliding groove is a strip-shaped through groove.

[0016] As a further improvement of the present application, the second screw drive mechanism includes a second bidirectional screw threadedly connected to a pair of first clamping bars and a third motor fixedly connected to the second bidirectional screw, the first clamping bar is slidably connected to a sliding frame, the second bidirectional screw is rotatably connected to the inner wall of the sliding frame, and the third motor is fixedly connected to the sliding frame.

[0017] As a further improvement of the present application, there are multiple winding assemblies and they are all fixedly connected to the same rotating disk. The rotating disk is rotatably connected to the support plate and is fixedly connected to the output shaft of the fifth motor. The fifth motor is fixedly connected to the base through a support rod.

[0018] As a further improvement of the present application, a fixed guide roller rotatably connected to the support plate is provided between the release mechanism and the fixed clamping assembly, a floating guide roller slidably connected to the support plate is provided between the movable clamping assembly and the winding mechanism, and the floating guide roller is fixedly connected to a lifting mechanism. When the first clamping strip passes through the floating guide roller, the lifting mechanism drives the floating guide roller to move downward.

[0019] As a further improvement of this application, the method of use includes the following steps:

[0020] Step 1: Loading: Manually pass the end of the film roll on the release mechanism through the fixed clamping assembly and the movable clamping assembly in sequence until it is fixed on the winding mechanism;

[0021] Step 2: clamping and tensioning; periodically and synchronously start the release mechanism and the winding mechanism, so that the plastic film is intermittently conveyed between the fixed clamping assembly and the movable clamping assembly. When the plastic film stops conveying, the fixed clamping assembly and the movable clamping assembly are started to clamp and fix the plastic film, and then the electric push rod is started, and the movable clamping assembly is pulled on the plastic film until the pressure sensor detects that the real-time tension value received by the plastic film reaches the set tension value;

[0022] Step 3: Segmented detection: Start the industrial camera to photograph the plastic film in a tensioned state between the fixed clamping component and the movable clamping component, and the controller identifies defects in the plastic film based on the photographed image;

[0023] Step 4: When unqualified defects are identified in the plastic film, the cutting assembly is activated to cut the defective film. After cutting, the fixed clamping assembly and the movable clamping assembly are activated to release the plastic film, and then the second loading is performed manually, and the cut end of the plastic film is installed on the winding mechanism. If no unqualified defects are identified, the fixed clamping assembly and the movable clamping assembly are activated to release the plastic film and continue the transmission inspection.

[0024] Step 5: Repeat steps 2 to 4 to continue the segmented clamping test on the plastic film.

[0025] In summary, the present invention provides a fixed clamping component and a movable clamping component to tension the intermittently conveyed plastic film section by section, replacing the traditional film detection device with a floating roller tensioning method, thereby reducing film vibration and motion artifacts during continuous film transmission and shooting, so that the photographed plastic film has better flatness, improves the quality of the captured image, and thus improves the accuracy of defect detection; in addition, the fixed clamping component and the movable clamping component are used to clamp and fix the two ends of the film to be inspected, thereby reducing the probability of the tear after the film is tensioned and torn extending to the non-inspection part of the film, thereby reducing the amount of plastic film waste generated during inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the present application from the front side perspective;

[0027] Figure 2 This is a schematic diagram of the transverse cross-sectional structure of the present application;

[0028] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0029] Figure 4Schematic diagram of the three-dimensional structure of the mobile clamping assembly and the tension mechanism in this application;

[0030] Figure 5 This is a schematic diagram of the exploded assembly structure of the mobile clamping component and the tensioning mechanism in this application;

[0031] Figure 6 This is a schematic diagram of the exploded assembly structure of the cutting component in this application;

[0032] Figure 7 Schematic diagram of the state of clamping and tensioning the plastic film;

[0033] Figure 8 This is a schematic diagram of the three-dimensional structure of the application from the rear side perspective;

[0034] Figure 9 This is a schematic diagram of the assembly structure of the third clamping assembly and the transverse screw module in this application;

[0035] Figure 10 This is a schematic diagram of the exploded assembly structure of the third clamping component in this application;

[0036] Figure 11 Schematic diagram of the three-dimensional structure of the winding assembly in this application;

[0037] Figure 12 for Figure 2 Schematic diagram of the enlarged structure at B in the middle;

[0038] Figure 13 This is a schematic diagram of the exploded assembly structure of the winding assembly in this application;

[0039] Figure 14 This is a schematic diagram of the state where the first clamping strip passes through the winding roller.

[0040] Description of the numbers in the figure:

[0041] 1. Base; 2. Support plate; 3. Release mechanism; 4. Winding mechanism; 5. Fixed clamping assembly; 6. Mobile clamping assembly; 7. Industrial camera; 8. Waste box; 9. Secondary feeding mechanism; 10. Mounting frame; 11. Clamping block; 12. First bidirectional screw rod; 13. First motor; 14. Cutting knife; 15. Clamping frame; 1501. Sliding column; 16. Eccentric groove roller; 1601. Eccentric circular groove; 17. Second motor; 18. Grooving; 19. Tensioning mechanism; 20. Moving cylinder; 21. Sliding block; 22. Spring; 23. Pressure Sensor; 24. Electric push rod; 25. Third clamping assembly; 26. Transverse screw module; 27. First clamping bar; 28. Second screw drive mechanism; 2801. Second bidirectional screw; 2802. Third motor; 29. ​​Sliding frame; 30. Winding assembly; 31. Winding roller; 3101. Open slot; 3102. Radial slot; 32. Winding seat; 33. Fourth motor; 34. Second clamping bar; 35. Leaf spring; 36. Rotating disk; 37. Fifth motor; 38. Controller; 39. Fixed guide roller; 40. Floating guide roller. DETAILED DESCRIPTION

[0042] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0043] The first implementation method:

[0044] Figure 1-7 The invention discloses a device for detecting defects in a plastic film, comprising a base 1 and a support plate 2 vertically fixedly connected to the base 1, a winding mechanism 4 and a release mechanism 3 with a fixed sleeve on the outer end provided with a film roll, the release mechanism 3 comprising a traction roller fixedly connected to the film roll and a driving motor for driving the traction roller to rotate, the driving motor is fixedly connected to the support plate 2, a tensioning detection mechanism is provided between the release mechanism 3 and the winding mechanism 4, the tensioning detection mechanism comprises a fixed clamping assembly 5 and a movable clamping assembly 6 arranged in a mirror image, the fixed clamping assembly 5 and the movable clamping assembly 6 having the same structure, the movable clamping assembly 6 comprises a mounting frame 10, a pair of clamping blocks 11 symmetrically arranged and distributed on the upper and lower sides of the plastic film are slidably connected in the mounting frame 10, the pair of clamping blocks 11 are threadedly connected to the same first bidirectional screw rod 12, the first bidirectional screw rod 12 is connected to a first motor 13, the first motor 13 drives the first bidirectional screw rod 12 to rotate, the first bidirectional screw rod 12 drives the pair of clamping blocks 11 to move toward or away from each other, and the pair of clamping blocks 11 clamps and releases the plastic film;

[0045] See also Figure 4 and Figure 5, the fixed clamping assembly 5 is fixedly connected to the support plate 2, and the mobile clamping assembly 6 is connected to a tensioning mechanism 19 that drives it to move laterally. The tensioning mechanism 19 includes a sliding block 21 fixedly connected to the mounting frame 10, and a mobile cylinder 20 is slidably sleeved on the outer side of the sliding block 21. A pressure sensor 23 is fixedly connected to the mobile cylinder 20, and a spring 22 abuts between the pressure sensor 23 and the sliding block 21. The outer end of the mobile cylinder 20 is fixedly connected to the movable end of the electric push rod 24, and the fixed end of the electric push rod 24 is fixedly connected to the support plate 2. When the fixed clamping assembly 5 fixes one end of the plastic film, the mobile clamping assembly 6 clamps and fixes the other end of the plastic film, and then starts the electric push rod 24, which drives the mobile cylinder 20 to move laterally, the sliding block 21 squeezes the spring 22, and the spring 22 squeezes the pressure sensor 23, and measures the tension applied to the plastic film under the pulling action of the mobile clamping assembly 6;

[0046] See also Figure 1 An industrial camera 7 is provided between the fixed clamping component 5 and the movable clamping component 6 and is located above the plastic film. The industrial camera 7 is fixedly connected to the support plate 2 through a fixed rod. The industrial camera 7 is electrically connected to the controller 38. The controller 38 is equipped with a defect recognition system. The defect recognition system includes an image acquisition module and a defect recognition module. The input end of the image acquisition module is connected to the industrial camera 7. The defect recognition module recognizes defects on the film based on the captured image acquired by the image acquisition module.

[0047] See also Figure 3 and Figure 6 A cutting assembly is provided in the clamping block 11 located on the upper side of the plastic film, and the cutting assembly includes a cutting knife 14 arranged in the clamping block 11, and the cutting knife 14 is fixedly connected to a clamping frame 15, and the clamping frame 15 is slidably clamped with an eccentric groove roller 16, and the front end of the eccentric groove roller 16 is fixedly connected to the output shaft of the second motor 17; the output shaft of the second motor 17 drives the eccentric groove roller 16 to rotate, and the eccentric groove roller 16 drives the clamping frame 15 to move up and down, and the clamping frame 15 drives the cutting knife 14 to move up and down to cut the defective film; a waste box 8 is provided below the plastic film between the fixed clamping assembly 5 and the movable clamping assembly 6.

[0048] Specifically, the unqualified part of the plastic film is cut off by the cutting component instead of manual cutting, so that the cut is neat and can be loaded twice. It should be noted that the secondary loading refers to reinstalling the broken end of the plastic film on the winding mechanism 4. In this embodiment, the winding mechanism 4 can use a traction roller and use glue to bond the end of the plastic film to the winding mechanism 4.

[0049] See also Figure 7 , and its usage includes the following steps:

[0050] Step 1: loading; manually pass the end of the film roll on the release mechanism 3 through the fixed clamping assembly 5 and the movable clamping assembly 6 in sequence until it is fixed on the winding mechanism 4;

[0051] Step 2: clamping and tensioning; periodically and synchronously start the release mechanism 3 and the winding mechanism 4, so that the plastic film is intermittently conveyed between the fixed clamping assembly 5 and the movable clamping assembly 6. When the plastic film stops conveying, the fixed clamping assembly 5 and the movable clamping assembly 6 are started to clamp and fix the plastic film, and then the electric push rod 24 is started, and the movable clamping assembly 6 is pulled on the plastic film until the pressure sensor 23 detects that the real-time tension value received by the plastic film reaches the set tension value;

[0052] Specifically, the set tension value is a manually set value that is related to the material and thickness of the plastic film and can be obtained through experiments. Under the set tension value, the plastic film is in a tensioned state and does not deform. In addition, the movable clamping assembly 6 moves away from the fixed clamping assembly 5 when the plastic film is stretched. In addition, after a section of plastic film is inspected, the film originally in the fixed clamping assembly 5 is moved to the movable clamping assembly 6. By controlling the number of winding turns of the release mechanism 3 and the winding mechanism 4, the plastic film is transported to a fixed length.

[0053] Step three, segmented detection; start the industrial camera 7 to photograph the plastic film in a tensioned state between the fixed clamping assembly 5 and the movable clamping assembly 6, and the controller 38 identifies defects in the plastic film based on the photographed image;

[0054] Step 4: When unqualified defects are identified in the plastic film, the cutting assembly is activated to cut the defective film. After cutting, the fixed clamping assembly 5 and the movable clamping assembly 6 are activated to release the plastic film, and then the second loading is performed manually to install the cut end of the plastic film on the winding mechanism 4. If no unqualified defects are identified, the fixed clamping assembly 5 and the movable clamping assembly 6 are activated to release the plastic film and continue to convey the inspection.

[0055] Step 5: Repeat steps 2 to 4 to continue the segmented clamping test on the plastic film.

[0056] It should be noted that unqualified defects refer to artificially set defect characteristics, which can be set as needed, including tearing, bulging, and impurities.

[0057] Compared with the traditional plastic film defect detection device, the present invention is provided with a fixed clamping component 5, a movable clamping component 6 and a tensioning mechanism 19 to tension the intermittently conveyed plastic film section by section, replacing the traditional film detection device with a floating roller tensioning method, thereby reducing film vibration and motion artifacts during continuous film transmission and shooting, so that the photographed plastic film has better flatness, improves the quality of the shot image, and thus improves the accuracy of defect detection; in addition, the fixed clamping component 5 and the movable clamping component 6 are used to clamp and fix the two ends of the film to be inspected, thereby reducing the probability of the tear after the film is tensioned and tearing extending to the non-detection part of the film, and reducing the amount of plastic film waste generated during detection; in addition, the cutting component arranged in the clamping block 11 is used to cut and remove the film with unqualified defects, thereby reducing the impact on the non-detection part of the film, and facilitating secondary loading, thereby improving the overall detection efficiency.

[0058] Please refer to Figure 6. The cutting knife 14 is a strip-shaped blade with an inverted triangular cross-section. The eccentric groove roller 16 is a longitudinally arranged circular roller structure with an annular groove provided at the center. The front and rear end faces of the eccentric groove roller 16 and the inner end faces on both sides of the annular groove are provided with eccentric circular grooves 1601. A plurality of sliding columns 1501 are fixedly connected to the clamping frame 15. The sliding columns 1501 slide and abut against the inner wall of the eccentric circular groove 1601. A accommodating cavity for accommodating the eccentric groove roller 16, the clamping frame 15 and the cutting knife 14 is provided in the clamping block 11.

[0059] Specifically, when the eccentric groove roller 16 rotates, it pushes the sliding column 1501 to slide in the eccentric circular groove 1601, and the sliding column 1501 drives the clamping frame 15 to move up and down to cut the film. By providing an annular groove in the middle of the eccentric groove roller 16 and an eccentric circular groove 1601 on the inner end face of the annular groove, the force on the cutting knife 14 is more uniform, thereby improving the quality of the cut film.

[0060] See also Figure 3 A cutting groove 18 is provided in the clamping block 11 located at the lower side of the plastic film and is arranged opposite to the cutting knife 14.

[0061] Specifically, when the cutting blade 14 cuts the plastic film, the cutting blade 14 is inserted into the cutting groove 18 to improve the cutting effect.

[0062] See also Figure 5 The moving cylinder 20 is a horizontally arranged hollow cylinder. The sliding block 21 includes a cylindrical portion that is slidably nested in the moving cylinder 20 and a block portion that is fixedly connected to the cylindrical portion and extends to the outside of the moving cylinder 20. The outer end of the block portion is fixedly connected to the mounting frame 10 of the mobile clamping assembly 6. The outer wall of the moving cylinder 20 is provided with a horizontal sliding groove for the block portion to slide horizontally. The horizontal sliding groove is a strip-shaped through groove.

[0063] Specifically, the movable clamping assembly 6 is slidably connected to the movable cylinder 20 via the sliding block 21 , thereby improving the stability of the lateral movement of the movable clamping assembly 6 .

[0064] Second implementation method:

[0065] Figure 8-14 A plastic film defect detection device is shown. In addition to the first embodiment, it further includes a secondary feeding mechanism 9. The secondary feeding mechanism 9 includes a third clamping assembly 25 and a transverse screw module 26 for driving the third clamping assembly 25 to move laterally. The third clamping assembly 25 includes a pair of first clamping bars 27 arranged in a mirrored manner, and a second screw drive mechanism 28 that drives the pair of first clamping bars 27 to move synchronously. The second screw drive mechanism 28 drives the pair of first clamping bars 27 to move toward each other to clamp the ends of the cut film.

[0066] See also Figure 10-14 The winding mechanism 4 includes a winding assembly 30, and the winding assembly 30 includes a winding roller 31. The winding roller 31 is fixedly connected to a winding seat 32, and the winding seat 32 is fixedly connected to the output shaft of the fourth motor 33. The fourth motor 33 drives the winding seat 32 and the winding roller 31 thereon to rotate and wind the plastic film; the winding roller 31 is provided with an open groove 3101, and a pair of second clamping strips 34 abutting each other are nested inside the open groove 3101. The second clamping strip 34 is fixedly connected to a leaf spring 35, and the leaf spring 33 is fixedly connected to the leaf spring 35. The outer end of the first clamping bar 27 is fixedly connected to the inner wall of the opening groove 3101; the first clamping bar 27 and the second clamping bar 34 are both long bars with isosceles trapezoidal cross-sections. When the broken plastic film is loaded again, the first clamping bar 27 clamps the plastic film and squeezes the second clamping bar 34 when passing through the opening groove 3101. After the first clamping bar 27 passes through the opening groove 3101, the plastic film is released. Then, the second clamping bar 34 clamps the plastic film passing through the winding roller 31 under the elastic action of the leaf spring 35.

[0067] For details, please refer to Figure 7 and Figure 14 After the plastic film is cut, the secondary loading is carried out, including the following steps:

[0068] Step 1: First, after the cutting is completed, the third clamping assembly 25 is activated to slide and clamp the plastic film located on the left side of the fixed clamping assembly 5. Second, the release mechanism 3 is activated and reversed, so that the cut end of the plastic film moves into the third clamping assembly 25. The release mechanism 3 is closed. Third, the fixed clamping assembly 5 and the movable clamping assembly 6 are activated to release the cut portion and the portion to be inspected of the plastic film.

[0069] Specifically, the two pairs of clamping blocks 11 of the fixed clamping assembly 5 and the movable clamping assembly 6 move away from each other when released, and the distance between them is greater than the sum of the thicknesses of the pair of first clamping bars 27 and the plastic film, so that the pair of first clamping bars 27 drives the plastic film to pass through the fixed clamping assembly 5 and the movable clamping assembly 6;

[0070] Step 2: Start the transverse screw module 26 and the release mechanism 3. The transverse screw module 26 drives the third clamping assembly 25 to drive the end of the plastic film to pass through the fixed clamping assembly 5, the movable clamping assembly 6 and the winding roller 31 in sequence.

[0071] Step three: after the third clamping assembly 25 passes through the opening slot 3101 of the winding roller 31, the third clamping assembly 25 is started to release the plastic film, completing the secondary loading of the plastic film, and the transverse screw module 26 drives the third clamping assembly 25 back to the initial position.

[0072] Compared with the traditional manual secondary loading method, the present invention is provided with a third clamping component 25 to clamp the end of the plastic film at the cut, and then drives the third clamping component 25 through the transverse screw module 26 to drive the end of the plastic film to pass through the open groove 3101 of the winding roller 31, and uses the second clamping strip 34 in the open groove 3101 of the winding roller 31 to clamp the end of the plastic film, thereby realizing automatic secondary loading of the broken plastic film; through the cooperation of the first clamping strip 27 and the second clamping strip 34, both of which have isosceles trapezoidal cross-sections, the plastic film can be quickly threaded and clamped.

[0073] See also Figure 9 The second screw drive mechanism 28 includes a second bidirectional screw 2801 threadedly connected to a pair of first clamping bars 27 and a third motor 2802 fixedly connected to the second bidirectional screw 2801. The first clamping bar 27 is slidably connected to the sliding frame 29, the second bidirectional screw 2801 is rotatably connected to the inner wall of the sliding frame 29, and the third motor 2802 is fixedly connected to the sliding frame 29.

[0074] Specifically, the distance between the pair of first clamping bars 27 is adjusted by the second screw drive mechanism 28 .

[0075] See also Figure 10 There are multiple winding assemblies 30 and they are all fixedly connected to the same rotating disk 36. The rotating disk 36 is rotatably connected to the support plate 2 and is fixedly connected to the output shaft of the fifth motor 37. The fifth motor 37 is fixedly connected to the base 1 through a support rod.

[0076] Specifically, the fifth motor 37 drives the rotating disk 36 and the multiple winding assemblies 30 thereon to perform circular motion, thereby realizing the switching of the winding assemblies 30 and meeting the demand of replacing the winding roller 31 when the plastic film is loaded for the second time after being broken.

[0077] See also Figure 13 The inner wall of the opening groove 3101 is provided with a radial groove 3102 for accommodating the second clamping strip 34 and the leaf spring 35 . The radial groove 3102 is a rectangular groove and is connected to the opening groove 3101 .

[0078] Specifically, when the first clamping strip 27 presses the second clamping strip 34 , the leaf spring 35 is compressed, and the second clamping strip 34 moves into the radial groove 3102 .

[0079] See also Figure 2 A fixed guide roller 39 is provided between the release mechanism 3 and the fixed clamping assembly 5, which is rotatably connected to the support plate 2. A floating guide roller 40 is provided between the movable clamping assembly 6 and the winding mechanism 4, which is slidably connected to the support plate 2. The floating guide roller 40 is fixedly connected to the lifting mechanism. When the first clamping bar 27 passes through the floating guide roller 40, the lifting mechanism drives the floating guide roller 40 to move downward.

[0080] Specifically, the plastic film is guided by a fixed guide roller 39 and a floating guide roller 40 to keep it horizontal. When the first clamping bar 27 drives the end of the plastic film to be loaded for the second time through the floating guide roller 40, the lifting mechanism drives the floating guide roller 40 to move downward and staggered with the first clamping bar 27 to avoid interference. It should be noted that the lifting mechanism (not shown in the figure) is an electric telescopic rod or a hydraulic rod, and the lifting mechanism is fixedly connected to the support plate 2. The lifting mechanism is a prior art and will not be described in detail in this application.

[0081] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A plastic film defect detection device, characterized in that: The invention comprises a base (1) and a support plate (2) vertically fixedly connected to the base (1); a winding mechanism (4) and a release mechanism (3) of a film roll fixedly sleeved at the outer end are fixedly connected to the support plate (2); a tension detection mechanism is provided between the release mechanism (3) and the winding mechanism (4); the tension detection mechanism comprises a fixed clamping assembly (5) and a movable clamping assembly (6) arranged in a mirror image; the fixed clamping assembly (5) and the movable clamping assembly (6) have the same structure; the movable clamping assembly (6) comprises a mounting frame (10); a pair of clamping blocks (11) symmetrically arranged in upper and lower directions and distributed on the upper and lower sides of the plastic film are slidably connected in the mounting frame (10); the pair of clamping blocks (11) are threadedly connected to the same first bidirectional screw rod (12); the first bidirectional screw rod (12) is connected to a first motor (13); The fixed clamping assembly (5) is fixedly connected to the support plate (2), and the movable clamping assembly (6) is connected to a tensioning mechanism (19) for driving the movable clamping assembly (6) to move laterally. The tensioning mechanism (19) includes a sliding block (21) fixedly connected to the mounting frame (10), a movable cylinder (20) is slidably sleeved on the outer side of the sliding block (21), a pressure sensor (23) is fixedly connected inside the movable cylinder (20), a spring (22) is abutted between the pressure sensor (23) and the sliding block (21), an outer end of the movable cylinder (20) is fixedly connected to the movable end of an electric push rod (24), and a fixed end of the electric push rod (24) is fixedly connected to the support plate (2); An industrial camera (7) is provided between the fixed clamping assembly (5) and the movable clamping assembly (6) and is located above the plastic film. The industrial camera (7) is fixedly connected to the support plate (2) via a fixed rod. The industrial camera (7) is electrically connected to a controller (38). The controller (38) is equipped with a defect recognition system. The defect recognition system includes an image acquisition module and a defect recognition module. The input end of the image acquisition module is connected to the industrial camera (7). The defect recognition module recognizes defects on the film based on the captured image acquired by the image acquisition module. A cutting assembly is provided in the clamping block (11) located on the upper side of the plastic film, and the cutting assembly includes a cutting knife (14) provided in the clamping block (11), the cutting knife (14) is fixedly connected to a clamping frame (15), the clamping frame (15) is slidably clamped to an eccentric groove roller (16), and the front end of the eccentric groove roller (16) is fixedly connected to the output shaft of the second motor (17); the output shaft of the second motor (17) drives the eccentric groove roller (16) to rotate, the eccentric groove roller (16) drives the clamping frame (15) to move up and down, and the clamping frame (15) drives the cutting knife (14) to move up and down to cut the defective film; a waste box (8) is provided between the fixed clamping assembly (5) and the movable clamping assembly (6) and is located below the plastic film; The secondary feeding mechanism (9) further comprises a third clamping assembly (25) and a transverse screw module (26) for driving the third clamping assembly (25) to move transversely; the third clamping assembly (25) comprises a pair of first clamping bars (27) arranged in an upper and lower mirror image and a second screw drive mechanism (28) for driving the pair of first clamping bars (27) to move synchronously; The winding mechanism (4) includes a winding assembly (30), the winding assembly (30) includes a winding roller (31), the winding roller (31) is fixedly connected to a winding seat (32), the winding seat (32) is fixedly connected to the output shaft of a fourth motor (33), and the fourth motor (33) drives the winding seat (32) and the winding roller (31) thereon to rotate and wind the plastic film; the winding roller (31) is provided with an open groove (3101), a pair of second clamping strips (34) abutting against each other are nested inside the open groove (3101), the second clamping strip (34) is fixedly connected to a leaf spring (35), the outer end of the leaf spring (35) is fixedly connected to the inner wall of the open groove (3101); both the first clamping strip (27) and the second clamping strip (34) are long strips with isosceles trapezoidal cross-sections.

2. A plastic film defect detection device according to claim 1, characterized in that: The cutting knife (14) is a strip-shaped blade with an inverted triangular cross-section. The eccentric groove roller (16) is a longitudinally arranged circular roller structure with an annular groove provided at the center. The front and rear end faces of the eccentric groove roller (16) and the inner end faces on both sides of the annular groove are provided with eccentric circular grooves (1601). A plurality of sliding columns (1501) are fixedly connected to the clamping frame (15). The sliding columns (1501) are in sliding contact with the inner wall of the eccentric circular groove (1601). The clamping block (11) is provided with an accommodating cavity for accommodating the eccentric groove roller (16), the clamping frame (15) and the cutting knife (14).

3. The plastic film defect detection device according to claim 1, characterized in that: A cutting groove (18) is provided in the clamping block (11) located on the lower side of the plastic film and is arranged opposite to the cutting knife (14).

4. The plastic film defect detection device according to claim 1, characterized in that: The movable cylinder (20) is a horizontally arranged hollow cylinder. The sliding block (21) includes a cylindrical portion slidably nested in the movable cylinder (20) and a block portion fixedly connected to the cylindrical portion and extending to the outside of the movable cylinder (20). The outer end of the block portion is fixedly connected to the mounting frame (10) of the movable clamping assembly (6). The outer wall of the movable cylinder (20) is provided with a transverse sliding groove for the block portion to slide transversely. The transverse sliding groove is a strip-shaped through-groove.

5. The plastic film defect detection device according to claim 1, characterized in that: The second screw drive mechanism (28) includes a second bidirectional screw (2801) threadedly connected to a pair of first clamping bars (27) and a third motor (2802) fixedly connected to the second bidirectional screw (2801), the first clamping bar (27) is slidably connected to the sliding frame (29), the second bidirectional screw (2801) is rotatably connected to the inner wall of the sliding frame (29), and the third motor (2802) is fixedly connected to the sliding frame (29).

6. The plastic film defect detection device according to claim 1, characterized in that: The winding assemblies (30) are multiple in number and are all fixedly connected to the same rotating disk (36). The rotating disk (36) is rotatably connected to the support plate (2) and is fixedly connected to the output shaft of the fifth motor (37). The fifth motor (37) is fixedly connected to the base (1) via a support rod.

7. The plastic film defect detection device according to claim 1, characterized in that: A fixed guide roller (39) rotatably connected to the support plate (2) is provided between the release mechanism (3) and the fixed clamping assembly (5); a floating guide roller (40) slidably connected to the support plate (2) is provided between the movable clamping assembly (6) and the winding mechanism (4); the floating guide roller (40) is fixedly connected to a lifting mechanism; when the first clamping strip (27) passes through the floating guide roller (40), the lifting mechanism drives the floating guide roller (40) to move downward.

8. The plastic film defect detection device according to claim 1, characterized in that: The method of use includes the following steps: Step 1: loading; manually passing the end of the film roll on the release mechanism (3) through the fixed clamping component (5) and the movable clamping component (6) in sequence until it is fixed on the winding mechanism (4); Step 2: clamping and tensioning; periodically and synchronously starting the release mechanism (3) and the winding mechanism (4) so ​​that the plastic film is intermittently conveyed between the fixed clamping assembly (5) and the movable clamping assembly (6); when the plastic film stops conveying, starting the fixed clamping assembly (5) and the movable clamping assembly (6) to clamp and fix the plastic film; then starting the electric push rod (24) and the movable clamping assembly (6) to pull the plastic film until the pressure sensor (23) detects that the real-time tension value received by the plastic film reaches the set tension value; Step three, segmented detection; starting the industrial camera (7) to photograph the plastic film in a tensioned state between the fixed clamping component (5) and the movable clamping component (6), and the controller (38) identifies defects in the plastic film based on the photographed image; Step 4: When it is identified that the plastic film has an unqualified defect, the cutting component is started to cut the defective film. After cutting, the fixed clamping component (5) and the movable clamping component (6) are started to release the plastic film, and then the second loading is performed manually to install the cut end of the plastic film on the winding mechanism (4); when no unqualified defect is identified, the fixed clamping component (5) and the movable clamping component (6) are started to release the plastic film and continue to transmit and inspect; Step 5: Repeat steps 2 to 4 to continue the segmented clamping test on the plastic film.

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