Optical film defect detection device and detection method

Abstract

The present invention relates to the field of optical film detection technology, and specifically to an optical film defect detection device and a detection method thereof, comprising a frame, a CCD camera, a light board, a conveying roller, a motor, a leveling mechanism, a leveling plate, a centering mechanism and a centering plate; adjustment cavities are symmetrically opened on both sides of the frame, and a CCD camera is fixedly installed on the top of the frame; a light board is correspondingly installed below the CCD camera; conveying rollers are installed at both ends of the frame, and the conveying rollers are connected to the motor; the leveling mechanism is located on both sides of the frame, and the leveling plate is connected to the frame through the adjustment cavity, and when the conveying roller transports the optical film, the conveying roller drives the leveling plate to reciprocate through the leveling mechanism; the centering mechanism is installed on the frame and is located in front of the leveling mechanism; when the leveling plate reciprocates, the leveling plate drives the centering plate to move in a centering manner through the centering mechanism. The present invention allows the optical film to remain centered and flat during the detection process through reciprocating motion, thereby improving the quality of optical film defect detection.

Description

Technical Field

[0001] The present invention relates to the technical field of optical film detection, and in particular to an optical film defect detection device and a detection method thereof. Background Art

[0002] Optical film refers to a thin film that is plated or coated on optical elements and uses the principle of light interference to change the optical properties of the carrier. It is one or more layers of dielectric film or metal film or a combination of these two types of films. According to the different characteristics of optical films, they are mainly divided into brightening films, diffusion films, reflective films, composite films, filters and polarizers. After the production of optical films, they need to be inspected for defects by a machine vision system to ensure the production quality of the optical films.

[0003] The mechanical vision system is mainly composed of a conveying unit, an image acquisition unit, an image processing unit and a human-computer interaction interface. The conveying unit is composed of a motor and a conveying roller. The image acquisition unit is mainly composed of a CCD camera and a light board. When inspecting the optical film, the motor drives the conveying roller to rotate, thereby conveying the optical film. The optical film is conveyed to the image acquisition unit. The light board provides a suitable lighting environment for the CCD camera to shoot. The CCD camera shoots the passing optical film and transmits the captured image to the image processing unit. The image processing unit scans and detects the captured photos to determine whether there are defects on the surface of the optical film, and transmits the detection results to the human-computer interaction interface for the staff to view.

[0004] During the transportation process of the optical film, wrinkles will occur on the optical film. The wrinkles make the optical film unable to be displayed smoothly, which in turn causes errors in the CCD camera shooting, thereby causing errors in the machine vision inspection system, affecting the inspection of the optical film.

[0005] To this end, the prior art has proposed an optical film surface defect detection device and method based on machine vision. The detection device can keep the material at the same height through a feeding mechanism. At the same time, the detection device can clean the material before detection to ensure the cleanliness of the material surface for easy detection. However, the problem of defect detection error caused by optical film wrinkles has not been solved.

[0006] In view of this, we propose an optical film defect detection device and a detection method thereof. Summary of the invention

[0007] The object of the present invention is to provide an optical film defect detection device and a detection method thereof to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An optical film defect detection device and a detection method thereof include a frame, a CCD camera, a light board, a conveying roller, a motor, a leveling mechanism, a leveling plate, a centering mechanism and a centering plate; adjustment cavities are symmetrically opened on both sides of the frame, and a CCD camera is fixedly installed on the top of the frame; a light board is correspondingly installed below the CCD camera, and the light board is installed directly opposite to the CCD camera, and the light board provides a good lighting environment for the CCD camera to shoot, which is convenient for the CCD camera to shoot, improves the contrast, and facilitates the image analysis unit to extract defect features. The CCD camera shoots the same frame number as the optical film conveying efficiency, thereby avoiding the occurrence of missed shooting areas that lead to incomplete defect detection, and improving the defect detection accuracy; conveying rollers are installed at both ends of the frame, and the conveying rollers are connected to the motor, and the conveying rollers convey the optical film;

[0010] The leveling mechanism is located on both sides of the frame, and the leveling plate is connected to the frame through an adjustment cavity. When the conveying roller transports the optical film, the conveying roller drives the leveling plate to reciprocate through the leveling mechanism. The reciprocating motion of the leveling plate levels the optical film to avoid wrinkles on the optical film during transportation, which in turn causes blocked areas in the captured pictures and affects the accuracy of defect detection; the centering mechanism is installed on the frame and is located in front of the leveling mechanism; when the leveling plate reciprocates, the leveling plate drives the centering plate to move in a centering manner through the centering mechanism. The centering displacement of the centering plate ensures that the optical film is always in the center position, to avoid position deviation of the optical film and affect the shooting effect of the CCD camera.

[0011] Preferably, the conveying roller is divided into a tensioning roller and a driven roller; the tensioning roller is fixedly connected to the motor, and threads with opposite rotation directions are symmetrically arranged on the tensioning roller; the tensioning roller is fixedly connected to the motor and rotates synchronously with the motor to convey the optical film, and at the same time, the threads with opposite rotation directions on the tensioning roller provide left-right symmetrical tensioning force to the optical film during the conveying process, avoiding left-right wrinkles on the optical film, keeping the optical film in a flat state at all times, and improving the shooting effect of the CCD camera.

[0012] Preferably, the leveling mechanism includes a driving wheel, a driven wheel, a crank-rocker mechanism, an extrusion plate, an airbag, a one-way valve and a blowing nozzle; the driving wheel is fixedly connected to the tensioning roller, a driven wheel is provided above the driving wheel, and the driven wheel is used to realize the transmission of motion; the driven wheel is fixedly connected to the driven roller, the driving wheel rotates synchronously with the tensioning roller, the driving wheel then meshes with the driven wheel to drive the driven wheel to rotate synchronously, and the rotation of the driven wheel drives the driven roller to rotate; crank-rocker mechanisms are respectively installed on the tensioning roller and the driven roller; the crank-rocker mechanism is rotatably connected to the leveling plate, and one end of the leveling plate is slidably installed with the adjusting chamber, and the rotation of the tensioning roller and the driven roller will drive the crank-rocker mechanism to move periodically, and the crank-rocker mechanism then The screed plate is driven to slide back and forth in the regulating chamber; the extrusion plate is slidably installed in the regulating chamber, and an airbag is provided in front of the extrusion plate; the airbag is located in the regulating chamber, and the airbag and the regulating chamber are connected by a one-way valve, and the one-way valve is used to limit the inlet and outlet direction of the gas, thereby constructing a gas flow passage; the airbag is connected to the blowing nozzle; the blowing nozzle is fixedly installed on the frame, and the screed plate will push the extrusion plate to slide during the reciprocating motion, and the extrusion plate will squeeze the airbag in the regulating chamber during the sliding process. The airbag is squeezed and the air inside it is blown out through the blowing nozzle, and the gas blown out by the blowing nozzle cleans the surface of the optical film, thereby improving the cleanliness of the surface of the optical film, thereby reducing the impact on the detection and improving the detection efficiency.

[0013] Preferably, the crank-rocker mechanism includes a crank and a rocker; the crank is fixedly connected to the tensioning roller and the driven roller respectively, the other end of the crank is rotatably connected to the rocker, the rocker is rotatably connected to the smoothing plate, the two cranks rotate synchronously with the tensioning roller and the driven roller respectively, the crank pulls the rocker to swing during the rotation, and the rocker pulls the smoothing plate to slide horizontally along the adjustment cavity to level the optical film.

[0014] Preferably, a rotating cavity is opened on the screed plate, and a cleaning roller is installed in the rotating cavity. The cleaning roller moves synchronously with the screed plate. The cleaning roller contacts the surface of the optical film during the movement, thereby cleaning the surface of the optical film, cleaning dust, fingerprints, etc. on the optical film, improving the shooting effect of the CCD camera, and thus ensuring the accuracy of defect detection.

[0015] Furthermore, the leveling plate is provided with an antistatic coating, which is used to prevent static electricity from being generated by friction between the leveling plate and the optical film during reciprocating motion, thereby causing the optical film to absorb dust in the air, thereby affecting the shooting effect, causing errors in defect detection, and affecting the accuracy of defect detection.

[0016] Preferably, the centering mechanism includes a driving rack, a driving wheel, a shaft sleeve, a sliding shaft, a driven rack and a slide plate; the driving rack is fixedly connected to the extrusion plate, and the driving rack is slidably mounted on the frame; a driving wheel is provided above the driving rack, and the driving wheel is rotatably connected to the frame, the driving rack is fixedly connected to the extrusion plate, and slides synchronously with the extrusion plate, and the driving wheel is meshed with the driving wheel during the sliding process to drive the driving wheel to rotate; the driving wheel is fixedly connected to the shaft sleeve, and a driving groove is provided on the shaft sleeve; a sliding shaft is slidably mounted in the shaft sleeve, and a driving block matching the driving groove is provided on the sliding shaft; a centering plate is fixedly mounted on the sliding shaft, and the driving The wheel drives the shaft sleeve to rotate synchronously. During the rotation of the shaft sleeve, the driving block is squeezed through the driving groove, and then the sliding shaft is driven to slide horizontally through the driving block. The sliding shaft pushes the tensioning block to move in the center, and pushes the optical film to prevent the optical film from deviating from the center position, thereby affecting the shooting effect of the CCD camera; a driven rack is provided above the driving wheel; a slide plate is fixedly installed on the driven rack; the slide plate is located in the adjusting cavity and contacts with the airbag. During the rotation of the driving wheel, the driven rack is synchronously driven, and the driven rack drives the slide plate to move in the same direction. The slide plate cooperates with the extrusion plate to symmetrically squeeze the airbag from both sides of the airbag, so that the airbag is evenly stressed, thereby ensuring the uniformity of blowing from the blowing nozzle.

[0017] Preferably, a card slot is provided on the centering plate, and elastic protrusions are symmetrically provided on the upper and lower sides of the card slot. The card slot on the centering plate is used to engage the optical film. The card slot fits with the optical film to prevent the optical film from bending when the centering plate pushes the optical film. The symmetrical elastic protrusions further strengthen the engagement of the card slot with the optical film, thereby ensuring the flatness of the optical film during the centering movement.

[0018] Furthermore, a soft pad is installed in the card slot, and the soft pad protects the side of the optical film to avoid damage to the side of the optical film during the pushing process, thereby preventing the surface of the optical film from being damaged and affecting the surface quality of the optical film.

[0019] A detection method comprising:

[0020] S1. Start the machine vision inspection system, turn on the light board to provide a suitable lighting environment for the CCD camera to shoot, and construct an ideal imaging environment through the light source, which is to appropriately increase the grayscale difference between the foreground and the background. Then, pull the optical film onto the conveyor roller, start the motor to drive the conveyor roller to rotate, and convey the optical film;

[0021] S2. During the rotation of the conveying roller, the two sides of the optical film are leveled. During the conveying process, the conveying roller tensions the two sides of the optical film to prevent the optical film from wrinkling. At the same time, the conveying roller drives the leveling mechanism, and the leveling mechanism drives the leveling plate to reciprocate along the conveying direction of the optical film to level the optical film. At the same time, the leveling mechanism drives the centering plate through the centering mechanism to push the optical film to keep it in the center during transportation, thereby improving the shooting effect of the CCD camera;

[0022] S3. The CCD camera transmits the captured image to the image analysis unit, which extracts the surface defects on the optical film through grayscale difference and transmits the extraction results to the human-computer interaction system for staff to view. The human-computer interaction system facilitates real-time viewing by staff and improves the efficiency of defect detection.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Optical film defect detection device and detection method thereof: The device avoids the phenomenon of wrinkles and deviations of the optical film during the detection process through the cooperation of the leveling mechanism and the centering mechanism, thereby improving the shooting quality of the optical film by the CCD camera, thereby improving the detection quality of defect detection.

[0025] 2. Optical film defect detection device and detection method, the device cleans the surface of the optical film through a leveling mechanism, avoiding dust and impurities adhering to the optical film, thereby affecting the shooting effect of the CCD camera and causing misjudgment.

[0026] 3. Optical film defect detection device and detection method thereof: This device promotes the cleaning effect of the leveling mechanism on the optical film through the centering mechanism, further reduces the phenomenon of dust adhesion during the transportation of the optical film, thereby protecting the defect detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a vertical half-section view of the overall structure of the present invention;

[0029] Figure 3 For the present invention Figure 2 A local enlarged view of point A;

[0030] Figure 4 It is a horizontal half-section view of the overall structure of the present invention;

[0031] Figure 5 For the present invention Figure 4 A local enlarged view of point B;

[0032] Figure 6 It is a schematic diagram of the assembly coordination of the present invention;

[0033] Figure 7 It is an overall schematic diagram of the leveling mechanism of the present invention;

[0034] Figure 8 A half-section schematic diagram of a screed plate of the present invention;

[0035] Fig. 9 It is a schematic diagram of the centering mechanism of the present invention;

[0036] Fig.10 It is a schematic diagram of the centering plate of the present invention.

[0037] In the figure:

[0038] 1. Frame; 11. Adjustment chamber;

[0039] 2. CCD camera;

[0040] 3. Light board;

[0041] 4. Conveying roller; 41. Tensioning roller; 42. Driven roller;

[0042] 5. Motor;

[0043] 6. Leveling mechanism; 61. Driving wheel; 62. Driven wheel; 63. Crank rocker mechanism; 631. Crank; 632. Rocker; 64. Extrusion plate; 65. Air bag; 66. One-way valve; 67. Blowing nozzle;

[0044] 7. Screed plate; 71. Rotating chamber; 72. Cleaning roller;

[0045] 8. Centering mechanism; 81. Driving rack; 82. Driving wheel; 83. Bushing; 831. Driving groove; 84. Sliding shaft; 841. Driving block; 85. Driven rack; 86. Slide plate;

[0046] 9. Centering plate; 91. Slot; 911. Elastic protrusion. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] A technical solution provided by the present invention:

[0049] like Figures 1 to 10As shown, an optical film defect detection device and a detection method thereof include a frame 1, a CCD camera 2, a light board 3, a conveying roller 4, a motor 5, a leveling mechanism 6, a leveling plate 7, a centering mechanism 8 and a centering plate 9; the frame 1 is symmetrically provided with adjustment cavities 11 on both sides, and a CCD camera 2 is fixedly installed on the top of the frame 1; a light board 3 is correspondingly installed below the CCD camera 2, and the light board 3 is installed opposite to the CCD camera 2, and the light board 3 provides a good lighting environment for the CCD camera 2 to shoot, which is convenient for the CCD camera 2 to shoot, and the shooting frame number of the CCD camera 2 is consistent with the optical film conveying efficiency, thereby avoiding the occurrence of missed shooting areas resulting in incomplete defect detection; improving the defect detection accuracy; the frame 1 is provided at both ends A conveying roller 4 is provided, and the conveying roller 4 is connected to a motor 5, and the conveying roller 4 conveys the optical film; the conveying roller 4 is divided into a tensioning roller 41 and a driven roller 42; the tensioning roller 41 is fixedly connected to the motor 5, and threads with opposite rotation directions are symmetrically arranged on the tensioning roller 41; the tensioning roller 41 is fixedly connected to the motor 5, and rotates synchronously with the motor 5, thereby conveying the optical film, and at the same time, the threads with opposite rotation directions on the tensioning roller 41 provide left-right symmetrical tensioning force to the optical film during the conveying process, thereby avoiding wrinkles in the left-right direction of the optical film, making the optical film always in a flat state, improving the shooting effect of the CCD camera 2, and at the same time, making the optical film evenly stressed, thereby avoiding slippage of the optical film during the conveying process;

[0050] The leveling mechanism 6 is located on both sides of the frame 1, and the leveling plate 7 is connected to the frame 1 through the adjustment cavity 11. When the conveying roller 4 transports the optical film, the conveying roller 4 drives the leveling plate 7 to reciprocate through the leveling mechanism 6. The reciprocating motion of the leveling plate 7 levels the optical film to avoid wrinkles in the optical film during transportation, which in turn causes blocked areas in the captured pictures and affects the accuracy of defect detection; the centering mechanism 8 is installed on the frame 1 and is located in front of the leveling mechanism 6; when the leveling plate 7 reciprocates, the leveling plate 7 drives the centering plate 9 to move in a centering manner through the centering mechanism 8. The centering displacement of the centering plate 9 ensures that the optical film is always in the center position, avoids the position of the optical film from shifting and affects the shooting effect of the CCD camera 2.

[0051] The driving wheel 61 is fixedly connected to the tensioning roller 41, and a driven wheel 62 is arranged above the driving wheel 61, and the driven wheel 62 is used to realize the transmission of motion; the driven wheel 62 is fixedly connected to the driven roller 42, and the driving wheel 61 rotates synchronously with the tensioning roller 41, and the driving wheel 61 then meshes with the driven wheel 62 to drive the driven wheel 62 to rotate synchronously, and the rotation of the driven wheel 62 drives the driven roller 42 to rotate; the tensioning roller 41 and the driven roller 42 are respectively installed with a crank rocker mechanism 63; the crank rocker mechanism 63 is rotationally connected to the screed plate 7, and one end of the screed plate 7 is slidably installed with the adjustment chamber 11, and ... the tensioning roller 41 and the driven roller 42 are respectively installed with a crank rocker mechanism 63; the crank rocker mechanism 63 is rotationally connected to the screed plate 7, and the screed plate 7 and the adjustment chamber 11 are slidably installed at one end. The crank-rocker mechanism 63 is driven to move periodically during the rotation of the roller 41 and the driven roller 42, and the crank-rocker mechanism 63 further drives the screed plate 7 to slide back and forth in the adjustment chamber 11; the crank-rocker mechanism 63 includes a crank 631 and a rocker 632; the crank 631 is fixedly connected to the tensioning roller 41 and the driven roller 42 respectively, the other end of the crank 631 is rotationally connected to the rocker 632, and the rocker 632 is rotationally connected to the screed plate 7, the two cranks 631 rotate synchronously with the tensioning roller 41 and the driven roller 42 respectively, and the crank 631 pulls the rocker 632 to swing during the rotation. The rocker 632 pulls the screed plate 7 to slide horizontally along the adjustment cavity 11 to level the optical film; a rotating cavity 71 is provided on the screed plate 7, and a cleaning roller 72 is installed in the rotating cavity 71. The cleaning roller 72 moves synchronously with the screed plate 7. The cleaning roller 72 contacts the surface of the optical film during the movement, thereby cleaning the surface of the optical film, cleaning the dust, fingerprints, etc. on the optical film, improving the shooting effect of the CCD camera 2, and thus ensuring the accuracy of defect detection; the screed plate 7 is provided with an antistatic coating, which is used to prevent the screed from contacting the optical film during the reciprocating motion. Static electricity is generated by friction, which causes the optical film to absorb dust in the air, thus affecting the shooting effect, resulting in errors in defect detection and affecting the accuracy of defect detection; the screed plate 7 remains relatively still with the optical film when sliding along the moving direction of the optical film, and when the screed plate 7 and the optical film move in the opposite direction, the screed plate 7 and the optical film are relatively displaced, and friction occurs between the screed plate 7 and the optical film, and the screed plate 7 stretches and flattens the optical film. During the friction process, the cleaning roller 72 rotates due to the friction force to clean the optical film, thereby preventing dust from continuously accumulating on one side of the cleaning roller 72, resulting in a decrease in cleaning efficiency;

[0052] The extrusion plate 64 is slidably installed in the regulating chamber 11, and an airbag 65 is provided in front of the extrusion plate 64; the airbag 65 is located in the regulating chamber 11, and the airbag 65 is connected to the regulating chamber 11 through a one-way valve 66, and the one-way valve 66 is used to limit the inlet and outlet direction of the gas, thereby constructing a gas flow passage, and the airbag 65 allows the gas to only flow from the outside into the airbag 65; the airbag 65 is connected to the blowing nozzle 67; the blowing nozzle 67 is fixedly installed on the frame 1, and the extrusion plate 7 will push the extrusion plate 64 to slide during the reciprocating motion, and the extrusion plate 64 will squeeze the airbag 65 in the regulating chamber 11 during the sliding process, and the airbag 65 is squeezed to vent the air inside The gas blown out by the blowing nozzle 67 cleans the surface of the optical film, improves the cleanliness of the surface of the optical film, and further reduces the impact on the detection, thereby improving the detection efficiency. When the screed plate 7 slides along the moving direction of the optical film under the action of the crank rocker mechanism 63, the screed plate 7 squeezes the airbag 65 through the squeezing plate 64. Under the action of the screed plate 7 and the one-way valve 66, the airbag 65 makes the gas in the airbag 65 spray out from the blowing nozzle 67. When the screed plate 7 is reversely displaced and reset, the airbag 65 is no longer affected by external force. Under the action of the pressure difference, the airbag 65 absorbs gas from the outside through the one-way valve 66, and the airbag 65 gradually recovers and pushes the squeezing plate 64 to reset.

[0053] When the machine vision inspection system is working, the motor 5 starts to drive the tension roller 41 to rotate, the tension roller 41 drives the driving wheel 61 to rotate synchronously, the driving wheel 61 is meshed with the driven wheel 62, drives the driven wheel 62 to rotate synchronously, the driven wheel 62 drives the driven roller 42 to rotate synchronously, the rotation of the tension roller 41 and the driven roller 42 respectively drives the crank 631 fixedly connected to do circular motion, the crank 631 drives the rocker 632 to swing, and the rocker 632 drives the screed plate 7 to reciprocate;

[0054] When the screed plate 7 slides along the moving direction of the optical film under the action of the crank rocker mechanism 63, the screed plate 7 pushes the extrusion plate 64 to slide in the same direction, and the extrusion plate 64 contacts the airbag 65, squeezing the airbag 65 so that the gas in the airbag 65 is ejected from the blowing nozzle 67. When the screed plate 7 is displaced in the opposite direction and reset, the airbag 65 is no longer affected by external force. Under the action of the pressure difference, the airbag 65 absorbs gas from the outside through the one-way valve 66, and the airbag 65 gradually recovers and pushes the extrusion plate 64 to reset.

[0055] The driving rack 81 is fixedly connected to the extrusion plate 64, and the driving rack 81 is slidably installed on the frame 1. A slide groove is provided on the frame 1, and a slider is provided on the driving rack 81. The driving rack 81 realizes its own sliding connection with the frame 1 through the cooperation of the slide groove and the slider; a driving wheel 82 is provided above the driving rack 81, and the driving wheel 82 is rotationally connected to the frame 1, and the driving rack 81 is fixedly connected to the extrusion plate 64, and slides synchronously with the extrusion plate 64. The driving wheel 81 is meshed with the driving wheel 82 during the sliding process to drive the driving wheel 82 to rotate; the driving wheel 82 is fixedly connected to the shaft sleeve 83, and a driving groove 831 is provided on the shaft sleeve 83; the shaft sleeve 83 is slidably installed There is a sliding shaft 84, on which a driving block 841 cooperating with the driving groove 831 is provided; a centering plate 9 is fixedly installed on the sliding shaft 84, and the driving wheel 82 drives the shaft sleeve 83 to rotate synchronously. During the rotation of the shaft sleeve 83, the driving block 841 is squeezed through the driving groove 831, and then the sliding shaft 84 is driven to slide horizontally through the driving block 841. The sliding shaft 84 pushes the tensioning block to move in the center, and pushes the optical film to prevent the optical film from deviating from the center position, thereby affecting the shooting effect of the CCD camera 2; a card slot 91 is opened on the centering plate 9, and the card slot 91 is symmetrically provided with elastic protrusions 911 above and below. The card slot 91 on the centering plate 9 is used to clamp the optical film. The card slot 91 and the optical film The optical film is fitted to avoid the bending of the optical film caused by the centering plate 9 during the pushing process of the optical film, but the card slot 91 will not block the optical film, thereby affecting the normal transportation of the optical film. The symmetrical elastic protrusions 911 further strengthen the card slot 91 The card fits the optical film to ensure the flatness of the optical film during the centering movement. A soft pad is installed in the card slot 91. The soft pad protects the side of the optical film to avoid damage to the side of the optical film during the pushing process, resulting in damage to the surface of the optical film and affecting the surface quality of the optical film; a driven rack 85 is provided above the driving wheel 82; a slide plate 86 is fixedly installed on the driven rack 85; the slide plate 86 is located in the adjustment chamber 11 and is in contact with the air chamber 11. The driven rack 85 is synchronously driven by the driving wheel 82 during its rotation, and the driven rack 85 drives the slide plate 86 to move in the same direction. The slide plate 86 cooperates with the extrusion plate 64 to symmetrically squeeze the airbag 65 from both sides of the airbag 65, so that the airbag 65 is evenly stressed, thereby ensuring the uniformity of the blowing of the blowing nozzle 67. When the optical film is offset, the centering plate 9 located in the offset direction pushes the optical film to the center position, and at the same time, pushes the optical film to slide into the card slot 91 of the centering plate 9 on the opposite side. At this time, the optical film is in a balanced state under the force of the two centering plates 9. When the centering plate 9 moves in the reverse direction to reset, the optical film remains fixed because the forces on both sides of the optical film are balanced, and will not be offset.

[0056] When the screed plate 7 slides along the moving direction of the optical film, the screed plate 7 pushes the extrusion plate 64 to slide synchronously, and the extrusion plate 64 pushes the driving rack 81, and the driving rack 81 meshes with the driving wheel 82, and the driving wheel 82 rotates, and the driving wheel 82 drives the shaft sleeve 83 to rotate. During the rotation of the shaft sleeve 83, the driving block 841 is squeezed through the driving groove 831, thereby driving the sliding shaft 84 to slide horizontally along the center of the frame 1, and the sliding shaft 84 pushes the centering plate 9 to move synchronously, and the centering plate 9 contacts the optical film through the slot 91, thereby pushing the optical film to move toward the center. At the same time, the driving wheel 82 drives the driven rack 85 to move in the opposite direction of the driving rack 81, and the driven rack 85 drives the slide plate 86 to move synchronously, and the slide plate 86 cooperates with the extrusion plate 64 to squeeze the airbag 65.

[0057] When the optical film defect detection device and the detection method of the present invention are used, the motor 5 is started first, the motor 5 starts to drive the tension roller 41 to rotate, the tension roller 41 drives the driving wheel 61 to rotate synchronously, the driving wheel 61 is meshed with the driven wheel 62, drives the driven wheel 62 to rotate synchronously, the driven wheel 62 drives the driven roller 42 to rotate synchronously, the rotation of the tension roller 41 and the driven roller 42 respectively drives the crank 631 fixedly connected to do circular motion, the crank 631 drives the rocker 632 to swing, and the rocker 632 drives the screed plate 7 to reciprocate;

[0058] When the screed plate 7 slides along the moving direction of the optical film under the action of the crank rocker mechanism 63, the screed plate 7 pushes the extrusion plate 64 to slide in the same direction, the extrusion plate 64 contacts the airbag 65, squeezes the airbag 65 so that the gas in the airbag 65 is ejected from the blowing nozzle 67, and at the same time, the screed plate 7 pushes the extrusion plate 64 to slide synchronously, the extrusion plate 64 pushes the driving rack 81, the driving rack 81 meshes with the driving wheel 82, the driving wheel 82 rotates, the driving wheel 82 drives the shaft sleeve 83 to rotate, and during the rotation of the shaft sleeve 83, the driving block 841 is squeezed through the driving groove 831, thereby driving the sliding shaft 84 to slide horizontally along the center of the frame 1, the sliding shaft 84 pushes the centering plate 9 to move synchronously, the centering plate 9 contacts the optical film through the card groove 91, thereby pushing the optical film to move in the center, and at the same time, the driving wheel 82 drives the driven rack 85 to move in the opposite direction to the driving rack 81, the driven rack 85 drives the slide plate 86 to move synchronously, and the slide plate 86 cooperates with the extrusion plate 64 to squeeze the airbag 65;

[0059] When the screed plate 7 is reversely displaced and reset, the airbag 65 is no longer affected by external force. Under the action of pressure difference, the airbag 65 absorbs gas from the outside through the one-way valve 66, and the airbag 65 gradually recovers and pushes the extrusion plate 64 to reset. The extrusion plate 64 pulls the driving rack 81 to move in the opposite direction and reset. The driving rack 81 drives the driving wheel 82 to reverse, and the driving wheel 82 drives the shaft sleeve 83 to reverse, and the shaft sleeve 83 drives the sliding shaft 84 to reset. The sliding shaft 84 pulls the centering plate 9 to reset. At the same time, the airbag 65 pushes the slide plate 86, and the slide plate 86 moves in the opposite direction and resets. The slide plate 86 drives the driven rack 85 to move in the opposite direction and reset.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An optical film defect detection device, comprising a frame (1), a CCD camera (2), a light board (3), a conveying roller (4) and a motor (5), characterized in that: It also includes a leveling mechanism (6), a leveling plate (7), a centering mechanism (8) and a centering plate (9); Adjustment cavities (11) are symmetrically provided on both sides of the frame (1), and a CCD camera (2) is fixedly mounted on the top of the frame (1); A light board (3) is correspondingly installed below the CCD camera (2); Conveying rollers (4) are installed at both ends of the frame (1), and the conveying rollers (4) are connected to the motor (5); The conveying roller (4) is divided into a tensioning roller (41) and a driven roller (42); the tensioning roller (41) is fixedly connected to the motor (5), and the tensioning roller (41) is symmetrically provided with threads with opposite rotation directions; The leveling mechanism (6) is located on both sides of the frame (1), the leveling plate (7) is connected to the frame (1) via an adjustment cavity (11), and when the conveying roller (4) transports the optical film, the conveying roller (4) drives the leveling plate (7) to reciprocate via the leveling mechanism (6); The leveling mechanism (6) comprises a driving wheel (61), a driven wheel (62), a crank rocker mechanism (63), an extrusion plate (64), an air bag (65), a one-way valve (66) and a blowing nozzle (67); The driving wheel (61) is fixedly connected to the tensioning roller (41), and a driven wheel (62) is provided above the driving wheel (61); The driven wheel (62) is fixedly connected to the driven roller (42); The tensioning roller (41) and the driven roller (42) are respectively provided with a crank rocker mechanism (63); The crank rocker mechanism (63) is rotatably connected to the screed plate (7); The extrusion plate (64) is slidably mounted in the adjustment cavity (11), and an air bag (65) is provided in front of the extrusion plate (64); The airbag (65) is located in the regulating chamber (11), and the airbag (65) and the regulating chamber (11) are connected via a one-way valve (66); The air bag (65) is connected to the blowing nozzle (67); The blowing nozzle (67) is fixedly mounted on the frame (1); The centering mechanism (8) is mounted on the frame (1) and is located in front of the leveling mechanism (6); when the leveling plate (7) reciprocates, the leveling plate (7) drives the centering plate (9) to move in a centering manner through the centering mechanism (8); The centering mechanism (8) comprises a driving rack (81), a driving wheel (82), a shaft sleeve (83), a sliding shaft (84), a driven rack (85) and a slide plate (86); The driving rack (81) is fixedly connected to the extrusion plate (64), and the driving rack (81) is slidably mounted on the frame (1); A driving wheel (82) is provided above the driving rack (81), and the driving wheel (82) is rotatably connected to the frame (1); The driving wheel (82) is fixedly connected to the shaft sleeve (83), and the shaft sleeve (83) is provided with a driving groove (831); A sliding shaft (84) is slidably mounted in the shaft sleeve (83), and a driving block (841) that cooperates with the driving groove (831) is provided on the sliding shaft (84); A centering plate (9) is fixedly mounted on the sliding shaft (84); A driven rack (85) is provided above the driving wheel (82); a slide plate (86) is fixedly mounted on the driven rack (85); The slide plate (86) is located in the adjustment chamber (11) and is in contact with the airbag (65).

2. The defect detection device according to claim 1, characterized in that: The crank-rocker mechanism (63) comprises a crank (631) and a rocker (632); one end of the crank (631) is fixedly connected to the tensioning roller (41) and the driven roller (42), respectively; the other end of the crank (631) is rotationally connected to the rocker (632); and the rocker (632) is rotationally connected to the screed plate (7).

3. The defect detection device according to claim 1, characterized in that: The screed plate (7) is provided with a rotating chamber (71), and a cleaning roller (72) is installed in the rotating chamber (71).

4. The defect detection device according to claim 3, characterized in that: The screed plate (7) is provided with an antistatic coating.

5. The defect detection device according to claim 1, characterized in that: The centering plate (9) is provided with a slot (91), and the slot (91) is symmetrically provided with elastic protrusions (911) above and below.

6. The defect detection device according to claim 5, characterized in that: A soft pad is installed in the card slot (91).

7. A detection method, used in the defect detection device according to any one of claims 1 to 6, comprising: S1. Start the machine vision inspection system, turn on the light board (3) to provide a suitable lighting environment for the CCD camera (2) to shoot, then pull the optical film onto the conveying roller (4), start the motor (5) to drive the conveying roller (4) to rotate, and convey the optical film; S2. During the rotation of the conveying roller (4), both sides of the optical film are leveled. At the same time, the conveying roller (4) drives the leveling mechanism (6), and the leveling mechanism (6) drives the leveling plate (7) to reciprocate along the conveying direction of the optical film to level the optical film. At the same time, the leveling mechanism (6) drives the centering plate (9) through the centering mechanism (8) to push the optical film to maintain centering during transportation; S3. The CCD camera (2) transmits the captured image to the image analysis unit, which extracts the surface defects on the optical film by grayscale difference and transmits the extraction results to the human-computer interaction system for staff to view.

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