CN117805130A - Defect detection equipment for protective film - Google Patents

Abstract

Embodiments of the present invention provide a defect detection apparatus of a protective film. The defect detection apparatus of the protective film includes: the conveying device is used for conveying the tested protective film along the conveying direction and is provided with a feeding station, a detection station and a discharging station along the conveying direction; the feeding device is used for placing the laminated tested protective films and transferring the top tested protective film in the laminated tested protective films to a feeding station; the detection device is used for detecting whether the detected protective film transmitted to the detection station has defects or not; and the blanking device is used for blanking the tested protective film conveyed to the blanking station. The defect detection equipment of the protective film can realize full-automatic processing of feeding, detecting and discharging of the detected protective film, and has the advantages of rich functions and high automation level. The defect detection equipment of the protective film can improve the detection working efficiency, so that the detection flux can be improved.

Description

Defect detection equipment for protective film

Technical Field

The invention relates to the technical field of detection of protective films, in particular to a defect detection device for a protective film.

Background

Polystyrene (PS) refers to polymers synthesized from styrene monomers by free radical addition polymerization. The polystyrene has the advantages of transparency, low cost, dust prevention, water resistance and the like, so that various instrument shells, lamp covers, optical chemical instrument parts, transparent films and the like can be manufactured. Among them, a polystyrene protective film (i.e., PS protective film) made of polystyrene may be attached on the surface of a display panel and other parts requiring protection.

Taking a display panel as an example, in the manufacturing process, after the current panel (FrontPlane Laminate, FPL) is attached, a PS protective film needs to be attached to the surface of the current panel. Thus, the PS protective film can play a role in protecting the front panel from dust, water and the like, thereby protecting the front panel.

However, since the PS protective film is relatively thin, various defects are extremely likely to occur after the completion of processing. Defects can lead to reduced flatness of the PS protective film, even reduced performance such as water resistance and the like, and thus the use experience is seriously affected. In the prior art, detection is usually performed by adopting a manual detection mode. Because the transparency of the PS protection film is higher, the detection efficiency of the manual detection mode is lower, and the accuracy is poorer. Accordingly, it is desirable to provide a novel defect detecting apparatus for a protective film.

Disclosure of Invention

In order to solve the problems in the prior art at least in part, embodiments of the present invention provide a defect detecting apparatus of a protective film. The defect detection apparatus of the protective film includes: the conveying device is used for conveying the tested protective film along the conveying direction and is provided with a feeding station, a detection station and a discharging station along the conveying direction; the feeding device is used for placing the laminated tested protective films and transferring the top tested protective film in the laminated tested protective films to the feeding station; the detection device is used for detecting whether the detected protective film transmitted to the detection station has defects or not; and the blanking device is used for blanking the tested protective film conveyed to the blanking station.

Illustratively, loading attachment includes spacing post and transfer subassembly, spacing post has spacing space, be used for placing in the spacing space the range upon range of protection film that is surveyed, be provided with the air-blowing hole on the spacing post, the air-blowing hole be used for to the top layer is surveyed the protection film and its adjacent butt department between the protection film that is surveyed, transfer subassembly includes at least two and is used for adsorbing the top layer is surveyed the protection film and place to the adsorption mechanism of material loading station, at least one adsorption mechanism is adsorbed the top layer is surveyed the protection film after the gravity direction is surveyed the top layer is gone on the top layer and is surveyed the protection film and shake from top to bottom.

The conveying device is further provided with a surface dust removing station between the feeding station and the detecting station along the conveying direction, and the defect detecting equipment of the protective film further comprises a surface dust removing device positioned at the surface dust removing station, wherein the surface dust removing device is used for removing dust on the surface of the detected protective film conveyed to the surface dust removing station.

Illustratively, the conveying device comprises a belt conveying line and a dust adhering component for removing dust from the belt conveying line, wherein the belt conveying line is used for conveying the tested protective film along the conveying direction, and the belt conveying line is provided with the feeding station, the detecting station and the discharging station along the conveying direction.

Illustratively, the dust adhering component is located below the belt conveying line, the dust adhering component comprises a support mechanism and a limiting plate, the support mechanism comprises a support, an elastic piece and a mounting piece, the mounting piece is used for mounting the dust adhering piece, the mounting piece is movable between a dust removing station and a spacing station, the dust adhering piece is abutted to the bottom of the belt conveying line when the mounting piece is located at the dust removing station so as to remove dust from the belt conveying line, the dust adhering piece is spaced from the belt conveying line when the mounting piece is located at the spacing station, the elastic piece is connected between the bottom of the support and the bottom of the mounting piece, the elastic piece applies an elastic force towards the dust removing station to the mounting piece, the limiting plate is clamped at a limiting position between the top of the support and the top of the mounting piece so that the mounting piece is located at the spacing station, and the limiting plate is located at an idle position so that the mounting piece is located at the dust removing station.

The detection station comprises a first leveling station and a first shooting station along the conveying direction, the first leveling station comprises a pressing sub-station, the first shooting station is adjacent to the pressing sub-station, the detection device comprises a first detection component, the first detection component comprises a first controller, a pressing sheet arranged at the pressing sub-station and a first vision mechanism arranged at the first shooting station, the first end of the pressing sheet is pressed against a bearing surface of the conveying device, so that the pressing sheet is provided with an arc surface protruding towards the bearing surface of the conveying device and a detected protection film can be conveyed between the arc surface and the bearing surface, the first vision mechanism is used for shooting the detected protection film conveyed to the first shooting station between the arc surface and the bearing surface, a first shooting image is obtained, and the first controller is used for determining whether the detected protection film has a first type of defects according to the first shooting image.

The detected protective film comprises at least two laminated film layers, the detection station comprises a second leveling station and a second shooting station which are arranged along the conveying direction, the second shooting station is adjacent to the second leveling station, the detection device comprises a second detection component, the second detection component comprises a second controller, a second pressing wheel positioned at the second leveling station and a second vision mechanism arranged at the second shooting station, a second preset gap is formed between the second pressing wheel and a bearing surface of the conveying device, the second pressing wheel is used for flattening the detected protective film conveyed to the second leveling station, the second vision mechanism is used for shooting the detected protective film conveyed to the second shooting station after being flattened through the second preset gap, and a second shooting image is obtained, and the second controller is used for determining whether the detected protective film has a second type of defects in the defects according to the second shooting image.

The detection device comprises a third detection component, a third pressing wheel positioned on the third leveling station and a third visual mechanism positioned on the third shooting station, the third pressing wheel and a bearing surface of the conveying device are provided with a third preset gap, the axial direction of the third pressing wheel is perpendicular to the conveying direction, the third pressing wheel rotates when the detected protective film passes through the third preset gap so that the detected protective film can be flattened to be within the depth of field of the third visual mechanism through the third preset gap, the third visual mechanism comprises a third light source and a third camera, a grating is arranged on the light-emitting surface of the third light source so that light emitted by the light-emitting surface passes through the grating to be irradiated to the third shooting station, the axial direction of the third pressing wheel is consistent with the conveying direction of the grating, and the third visual mechanism is used for determining whether the detected protective film is subjected to the third image capturing according to the third visual mechanism, and the third visual mechanism is used for capturing the detected defect or not.

Illustratively, the conveying device comprises a roller conveying line, the roller conveying line is used for conveying the tested protective film along the conveying direction, the detection station comprises a laminating station and a fourth shooting station, the laminating station is arranged on the roller conveying line along the conveying direction, the detection device comprises a fourth detection assembly, the fourth detection assembly comprises a laminating roller, a fourth vision mechanism and a fourth controller, the fourth shooting station is adjacent to the laminating station, and the laminating roller is used for flattening the tested protective film positioned at the laminating station; the fourth vision mechanism is used for shooting the tested protective film transmitted to the fourth shooting station to obtain a fourth shooting image, and the fourth controller is used for determining whether the tested protective film has a fourth type of defects in the defects according to the fourth shooting image.

Illustratively, the protective film under test comprises a PS protective film.

According to the defect detection equipment for the protective film, provided by the embodiment of the invention, the feeding device can transfer the top layer to be detected protective film to the feeding station. Then, the conveying device can convey the top layer tested protective film to the detection station. Then, the detecting device can detect the detected protective film to judge whether the detected protective film has defects or not. Then, the conveying device can convey the tested protective film to the blanking station. Then, the blanking device can be used for blanking the tested protective film. Thus, the defect detecting device of the protective film can complete one detection flow. The defect detecting apparatus of the protective film may repeatedly perform the above-described flow to detect more protective films to be detected. In conclusion, the defect detection equipment of the protective film can realize full-automatic processing of feeding, detecting and discharging of the detected protective film, and is rich in functions and high in automation level. The defect detection equipment of the protective film can improve the detection working efficiency, so that the detection flux can be improved. And, the defect detection equipment of the protective film can be free from the participation of staff, so that the labor cost can be reduced. Based on this, the problem of the detection accuracy degradation due to the manual operation error can be avoided, and therefore the defect detection apparatus of the protective film also has the advantage of high detection accuracy.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Advantages and features of the invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification. Embodiments of the present invention and their description are shown in the drawings to explain the principles of the invention. In the drawings of which there are shown,

fig. 1 is a perspective view of a defect detecting apparatus of a protective film according to an exemplary embodiment of the present invention;

fig. 2 is a top view of the defect detecting apparatus of the protective film shown in fig. 1;

fig. 3 is a perspective view of a part of the structure of the loading device shown in fig. 1;

fig. 4 is a perspective view of a transfer assembly of the loading device shown in fig. 1;

FIG. 5 is a perspective view of the dust assembly shown in FIG. 1 with the mounting member in a dust removal station and the limiting plate in an idle position;

FIG. 6 is a perspective view of the dust assembly shown in FIG. 1 with the mounting member in the spacing station and the limiting plate in the limiting position;

Fig. 7 is a perspective view of a part of the structure of the defect detecting apparatus of the protective film shown in fig. 1;

FIG. 8 is a perspective view of a portion of the structure of the first detection assembly shown in FIG. 7;

FIG. 9 is a side view of a portion of the structure of the first detection assembly shown in FIG. 7;

fig. 10 is a perspective view of a part of the structure of the defect detecting apparatus of the protective film shown in fig. 1;

FIG. 11 is a perspective view of a portion of the structure of the third detection assembly shown in FIG. 10;

FIG. 12 is a side view of a portion of the structure of the first detection assembly shown in FIG. 10; and

fig. 13 is a perspective view of a part of the structure of the defect detecting apparatus of the protective film shown in fig. 1.

Wherein the above figures include the following reference numerals:

1000. a transfer device; 1100. a bearing surface; 1200. a feeding station; 1300. detecting a station; 1310. a first flattening station; 1320. a first shooting station; 1330. a second flattening station; 1340. a second shooting station; 1350. a third flattening station; 1360. a third shooting station; 1370. a laminating station; 1380. a fourth shooting station; 1400. a blanking station; 1500. a surface dust removal station; 1600. a belt conveyor line; 1700. a dust adhering component; 1710. a bracket mechanism; 1711. a bracket; 1712. an elastic member; 1713. a mounting member; 1720. a limiting plate; 1730. a dust-sticking member; 1800. a roller conveyor line; 2000. a feeding device; 2100. a limit column; 2110. an air blowing hole; 2200. a transfer assembly; 2210. an adsorption mechanism; 2220. a main adsorption mechanism; 2230. a sub-adsorption mechanism; 2300. a limit space; 3000. a detection device; 3100. a first detection assembly; 3110. tabletting; 3111. a first end; 3112. a second end; 3113. a cambered surface; 3114. leveling the space; 3120. a first vision mechanism; 3130. a first portal; 3140. a second portal; 3150. a first pinch roller; 3200. a second detection assembly; 3210. a second pinch roller; 3220. a second vision mechanism; 3300. a third detection assembly; 3310. a third pinch roller; 3320. a third vision mechanism; 3321. a third camera; 3330. a third portal; 3340. a fourth portal; 3400. a fourth detection assembly; 3410. laminating rollers; 3420. a fourth vision mechanism; 4000. a blanking device; 5000. a surface dust removing device.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the invention by way of example only and that the invention may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the invention.

Embodiments of the present invention provide a defect detection apparatus of a protective film. The type of defect that may exist is also different depending on the kind of the protective film. With the development of various inspection means, more and more types of defects can be inspected before the product flows into the next process or leaves the factory. However, the structure of the protective film has the characteristics of light weight, thinness, softness, easy recovery after flattening, and the like, and the problem of warpage and the like easily occurs in the transmission process, and the unevenness may affect the detection result of defect detection, especially in the case of performing defect detection by adopting vision. Moreover, the protective film is generally transparent, and any local unevenness may cause a problem of light reflection, so that it is desirable to finish the protective film to improve its flatness before defect detection is performed.

As shown in fig. 1-2, the defect detecting apparatus for the protective film may include a transfer device 1000, a loading device 2000, a detecting device 3000, and a discharging device 4000.

The transfer device 1000 may be used to transfer the protective film under test in the transfer direction X-X. The protective film to be tested may be any suitable protective film. In some embodiments, the protective film under test may include a PS protective film. The conveyor 1000 may include one or more of a conveyor belt, conveyor rollers, conveyor chains, and the like. The conveying device 1000 has a carrying surface 1100 for conveying the tested protective film. The protective film to be tested may be placed on the carrying surface 1100 so as to be conveyable by the conveying device 1000 in the conveying direction X-X. The conveyor 1000 may have a loading station 1200, a detection station 1300, and a blanking station 1400 along the conveying direction X-X. The tested protective film can sequentially pass through the feeding station 1200, the detecting station 1300 and the discharging station 1400 along the conveying direction X-X.

The loading device 2000 may be used for placing laminated protective films to be tested. The laminated protective film to be tested can be placed on the loading device 2000 by related personnel through a manual mode or a mechanical arm and other parts. And, the loading device 2000 can transfer the top tested protective film among the laminated tested protective films to the loading station 1200. The manner in which the loading device 2000 transfers the top layer of the tested protective film may be arbitrary, including but not limited to adsorption or lifting.

The inspection device 3000 may be used to inspect whether the protective film being inspected conveyed to the inspection station 1300 has defects. Such defects include, but are not limited to, edge trim failure, in-film impurities, edge delamination, creases, line pits, and spot pits.

The blanking device 4000 may be used to blanking the tested protective film transferred to the blanking station 1400. The blanking device 4000 may be configured to blank the tested protective film by any suitable means, such as adsorption or lifting.

The device for detecting defects of the protective film provided by the embodiment of the invention can transfer the top layer tested protective film to the feeding station 1200 by the feeding device 2000. The transfer device 1000 may then transfer the top layer of the protective film under test to the inspection station 1300. Then, the inspection device 3000 may inspect the protective film to be inspected to determine whether it has a defect. Then, the transfer device 1000 may transfer the tested protective film to the discharging station 1400. Then, the discharging device 4000 may discharge the tested protective film. Thus, the defect detecting device of the protective film can complete one detection flow. The defect detecting apparatus of the protective film may repeatedly perform the above-described flow to detect more protective films to be detected. In conclusion, the defect detection equipment of the protective film can realize full-automatic processing of feeding, detecting and discharging of the detected protective film, and is rich in functions and high in automation level. The defect detection equipment of the protective film can improve the detection working efficiency, so that the detection flux can be improved. And, the defect detection equipment of the protective film can be free from the participation of staff, so that the labor cost can be reduced. Based on this, the problem of the detection accuracy degradation due to the manual operation error can be avoided, and therefore the defect detection apparatus of the protective film also has the advantage of high detection accuracy.

For example, as shown in fig. 1-4, the loading device 2000 may include a stop post 2100 and a transfer assembly 2200. The limit post 2100 may have a limit space 2300. The spacing space 2300 may be used for placing a laminated protective film under test. The limit post 2100 may be provided with an air-blowing hole 2110. The air blowing holes 2110 may be used to blow air to the abutment between the top layer of the protective film under test and its adjacent protective film under test. The purge hole 2110 may be used to connect to a gas source. The gas source may supply gas so that the gas may be blown out through the gas blowing holes 2110. The transfer assembly 2200 may include at least two suction mechanisms 2210 for sucking the top layer of the protective film under test and placing it into the loading station 1200. At least one adsorption mechanism 2210 shakes the top layer tested protective film up and down along the gravity direction after adsorbing the top layer tested protective film. In the embodiment shown in the figures, the adsorption mechanism 2210 may include a main adsorption mechanism 2220 and a sub-adsorption mechanism 2230. The main adsorption mechanism 2220 and the sub-adsorption mechanism 2230 may adsorb the top-layer tested protective film. And after the top layer tested protective film is adsorbed, the top layer tested protective film is dithered up and down along the gravity direction. In other embodiments not shown in the figures, the number of adsorption mechanisms 2210 may be further increased. After the up-and-down dithering is completed, the transfer assembly 2200 may drive the suction mechanism 2210 to move in the lateral direction Y-Y to place the top layer of the protective film under test to the loading station 1200. The transverse direction Y-Y may be perpendicular to the conveying direction X-X.

When the adsorption mechanism 2210 adsorbs the top layer tested protective film, the air blowing hole 2110 can blow air to the abutting part between the top layer tested protective film and the adjacent tested protective film, so that adhesion between the top layer tested protective film and the adjacent tested protective film can be avoided, and when the adsorption mechanism 2210 adsorbs the top layer tested protective film, one tested protective film is adsorbed at a time. And, through adsorption equipment 2210 after adsorbing the top layer and being surveyed the protection film, shake about the top layer and be surveyed the protection film along the direction of gravity, be favorable to making unexpected adhesion adjacent quilt on the top layer and survey the protection film or other objects drop more. Therefore, the method can further ensure that only the top layer of the tested protective film is adsorbed at a time.

1-2, the conveyor 1000 may also have a surface dust removal station 1500 between the loading station 1200 and the inspection station 1300 along the conveying direction X-X. The protective film defect inspection apparatus may further include a surface dust removal device 5000 located at the surface dust removal station 1500. The surface dust removing device 5000 is used for surface dust removal of the tested protective film transferred to the surface dust removing station 1500. The manner in which the surface dust removal device 5000 removes dust may be arbitrary, including but not limited to ion wind blowing. By providing the surface dust removing device 5000, dirt such as dust on the surface of the protective film to be tested can be removed. In this way, it is possible to avoid that these contaminants cause a decrease in the accuracy of the detection.

1-2, the conveyor 1000 may include a belt conveyor line 1600 and a dust assembly 1700. The belt conveyor line 1600 is used to convey the protective film under test in the conveying direction X-X. The belt conveyor line 1600 may have a loading station 1200, a surface dust removal station 1500, a detection station 1300, and a blanking station 1400 along the conveying direction X-X. The dust assembly 1700 may be used to remove dust from the belt conveyor line 1600. By providing the dust-sticking assembly 1700, dirt such as dust on the belt conveyor line 1600 can be removed, thereby ensuring higher surface cleanliness of the belt conveyor line 1600. Thus, the dirt can be prevented from adhering to the tested protective film, and the accuracy of detection is reduced.

For example, as shown in fig. 5-6, the dust assembly 1700 may be located below the belt conveyor line 1600. The dust assembly 1700 may include a bracket mechanism 1710 and a restrictor plate 1720. The bracket mechanism 1710 can include a bracket 1711, an elastic member 1712, and a mounting member 1713. The mounting member 1713 may be used to mount the dust attachment member 1730. The dust-sticking member 1730 may stick dust by an adhesive force or an electrostatic suction force, for example. In some embodiments, dust attachment 1730 may include a dust attachment roller. Illustratively, the dust assembly 1700 may also include a dust member 1730. The mount 1713 is movable between a dusting station (see fig. 5) and a spacing station (see fig. 6). Specifically, the mounting 1713 is movable upward to a dusting station and downward to a spaced apart position. Thus, the dust-sticking member 1730 can be driven to reciprocate between a position close to the belt conveyor line 1600 and a position away from the belt conveyor line 1600. The dust adhering member 1730 abuts against the bottom of the belt conveyor line 1600 when the mounting member 1713 is located at the dust removing station to remove dust from the belt conveyor line 1600. Dust adhering member 1730 is spaced apart from belt conveyor line 1600 when mounting member 1713 is in the spacing station.

The elastic member 1712 may be coupled between the bottom of the housing 1711 and the bottom of the mounting member 1713. The elastic member 1712 can apply an elastic force to the mounting member 1713 toward the dusting station. Thus, the mount 1713 has a tendency to remain in the dusting station without being subjected to other external forces. The elastic member 1712 includes, but is not limited to, an elastic member made of an elastic material such as a spring or rubber.

The stopper plate 1720 is movable between a stopper position and an idle position. The stop plate 1720 is clamped between the top of the housing 1711 and the top of the mount 1713 when the mount 1713 is in the stop position. When the stopper 1720 is in the idle position, the mount 1713 is located at the dust removal station. The stop plate 1720, when in the idle position, does not have any effect on the mount 1713. Thus, the mounting member 1713 can be moved to and stably maintained at the dust removing station by the elastic member 1712.

In the dust assembly 1700 provided by the embodiment of the invention, the mounting member 1713 is movably disposed on the support 1711 between the dusting station and the spacing station, and the restrictor plate 1720 is movable between a restrictor position and an idle position. When the stop plate 1720 is in the idle position, the mounting member 1713 may be positioned at a dusting station and the dust adhering member 1730 may abut the bottom of the belt conveyor line 1600. As the belt conveyor line 1600 moves, the dust adhering member 1730 may wipe across the surface of the belt conveyor line 1600. In this way, the dust-sticking member 1730 sticks to dust on the belt conveyor line 1600, thereby removing dust from the belt conveyor line 1600. After each time dust-binding member 1730 is operated, a layer of adhesive film needs to be torn off to secure dust-binding capability, but this results in thinning of dust-binding member 1730. At this time, the elastic member 1712 can apply an elastic force to the mounting member 1713 toward the dust removing station to compensate for the distance of the torn adhesive film, so as to ensure that the dust adhering member 1730 is closely attached to the bottom of the belt conveyor line 1600, thereby ensuring a better dust removing effect. When the adhesive film on the dust adhering member 1730 is exhausted, the mounting member 1713 may be moved to the spacing station and the stopper member may be clamped between the top of the frame 1711 and the top of the mounting member 1713, and the mounting member 1713 may be slid to the spacing station, at which point the dust adhering member 1730 may be spaced apart from the belt conveyor line 1600. Thus, the dust adhering member 1730 may be removed and replaced with a new dust adhering member 1730. Therefore, the dust-sticking assembly 1700 can maintain a good dust removing effect for a long period of time, and facilitate replacement of the dust-sticking member 1730.

1-2 and 7-9, the inspection station 1300 may include a first leveling station 1310 and a first photographing station 1320 along the conveying direction X-X. The first flattening station 1310 may include a sheeter station. The first shooting station 1320 and the sheeting sub-station may be adjacent. The transfer device 1000 may transfer the protective film under test sequentially through the sheeting sub-station and the first photographing station 1320 in the transfer direction X-X. In this way, the tested protective film is subjected to the leveling process by the tabletting sub-station, and then subjected to the defect detection by the first photographing station 1320. The sensing device 3000 may include a first sensing assembly 3100. The first detection assembly 3100 can include a first controller, a sheeting 3110 disposed at a sheeting sub-station, and a first vision mechanism 3120 disposed at a first capture station 1320.

The compression sheet 3110 may have a first end 3111 at a lower portion and a second end 3112 at an upper portion. The second end 3112 may be fixed to the first mast 3130. The first portal 3130 may span the conveyor 1000. The first portal 3130 mainly serves as a fixing function for the compression sheet 3110. The first portal 3130 may have various suitable structures as long as the passing of the tested protective film under the first portal 3130 is not affected. The first end 3111 is pressed against the bearing surface 1100 of the conveyor 1000, see fig. 9, so that the press sheet 3110 has a cambered surface 3113 that projects towards the bearing surface 1100 of the conveyor 1000. The first end 3111 may be located behind the fixed second end 3112 along the conveying direction X-X. Thus, a leveling space 3114 may be formed between the arc surface 3113 and the bearing surface 1100. The leveling space 3114 has a gradually decreasing height in the conveying direction X-X under the restriction of the arc surface 3113, as viewed from the side of the conveying device 1000, so that the protective film to be tested can smoothly pass through the pressing sheet 3110 from left to right (fig. 9). When no protective film to be tested passes the press sheet 3110, the first end 3111 of the press sheet 3110 may abut the bearing surface 1100. The pressing piece 3110 may be slightly elastically deformed when the protective film to be tested passes through, so that the protective film to be tested can be transferred between the arc surface 3113 and the bearing surface 1100. In the transverse direction Y-Y, the preform 3110 may have a sufficient width. Typically, the width of the press sheet 3110 may be greater than or equal to the width of the protective film to be tested, so that the protective film to be tested can be compacted and flattened by the press sheet 3110 everywhere on the protective film to be tested after passing the press sheet 3110 in the conveying direction X-X.

The first vision mechanism 3120 may be used to capture a first captured image of the protective film being tested that is transferred between the arc surface 3113 and the bearing surface 1100 to the first capture station 1320. The first controller may be configured to determine whether the protective film under test has a first type of defect from the first captured image. In some embodiments, the first type of defect may include at least one of the following: edge cutting failure, in-film impurities, edge delamination, and line pits distributed in a direction other than the conveying direction X-X. First vision mechanism 3120 may be secured to second door frame 3140. Second door 3140 may span conveyor 1000. Alternatively, first vision mechanism 3120 may be liftable coupled to second door frame 3140 to adjust the height of first vision mechanism 3120 relative to bearing surface 1100 to obtain a clear first captured image.

In the defect detection apparatus for a protective film provided in the embodiment of the present invention, when the conveying device 1000 conveys the protective film to be tested to the tablet station, the first end 3111 of the tablet 3110 and the bearing surface 1100 of the conveying device 1000 may press the protective film to be tested together, so that the protective film to be tested may be flattened, and further, a warpage phenomenon of the protective film to be tested may be avoided. Because the first shooting view of the first vision mechanism 3120 is adjacent to the tablet pressing sub-station, the first vision mechanism 3120 can immediately shoot the flattened tested protective film, thereby avoiding the tested protective film from being warped under the action of self elasticity. Therefore, the quality of the first captured image is higher and less disturbing to the detection of defects of the first type. Based on the method, the first controller can accurately determine whether the detected protective film has the first type of defects in defects, and the accuracy of detecting the first type of defects is high. And moreover, the defect detection equipment of the protective film does not need personnel to participate, so that human-caused errors can be avoided, the detection efficiency is higher, the accuracy is higher, the labor cost is reduced, and the market competitiveness is higher.

7-9, the first flattening station 1310 may also include a pinch roller sub-station located before the sheeter sub-station in the conveying direction X-X. The pinch roller sub-station and the sheeting sub-station may be adjacent. First sensing assembly 3100 can also include a first puck 3150 disposed at the puck sub-station. The first pinch roller 3150 is used for primarily flattening the protective film to be tested that is transferred to the pinch roller sub-station by the transfer device 1000. The first pressing wheel 3150 and the bearing surface 1100 of the conveying device 1000 may have a first preset gap, so as to allow the tested protective film with poor flatness to be primarily flattened; the protective film to be tested then passes through the press sheet 3110, and the first end 3111 of the press sheet 3110 can be pressed against the carrying surface 1100 of the conveyor 1000, so that the leveling effect is better than that of the first pressing wheel 3150, so that the protective film to be tested is further leveled.

Illustratively, as shown in fig. 2, the protective film to be tested may include at least two laminated film layers. In this case, the protective film to be tested can be leveled and inspected a plurality of times. Particularly, when the delamination is relatively large, the edge delamination defect may be pressed down after one leveling and detecting. If the pressure is small, the detection standard of the client is not met, and therefore the detection cannot be detected, and the problem of missed detection exists. Accordingly, multiple levels and inspections may be performed, for which purpose inspection station 1300 may also include a second level station 1330 and a second camera station 1340. The second photographing station 1340 and the second leveling station 1330 may be adjacent. The second leveling station 1330 and the second photographing station 1340 may be disposed sequentially along the conveying direction X-X.

The sensing device 3000 may also include a second sensing component 3200. Second inspection assembly 3200 may include a second controller, a second puck 3210 at second leveling station 1330, and a second vision mechanism 3220 disposed at second photographing station 1340. The second pressing wheel 3210 has a second predetermined gap with the bearing surface 1100 of the conveying apparatus 1000. The second pressing wheel 3210 is used for flattening the tested protective film transferred to the second flattening station by the transfer device 1000. The second vision mechanism 3220 is used for shooting the tested protective film transferred from the second pressing wheel 3210 to the second shooting station between the bearing surface 1100 to obtain a second shot image. The second controller may be configured to determine whether the protective film under test has a second type of defect from the second captured image. The second type of defect may be an edge delamination defect. The boundary layer defect can be rechecked by performing the leveling and the detecting twice with the first detecting module 3100 and the second detecting module 3200. Thereby the omission ratio can be reduced.

1-2 and 10-12, the inspection station 1300 may also include a third flattening station 1350 and a third shooting station 1360 in the conveying direction X-X. The third photography station 1360 may be adjacent to the third leveling station 1350. In this way, the tested protective film is flattened by the third flattening station 1350 and then subjected to defect detection by the third photographing station 1360. The detection apparatus 3000 may further comprise a third detection component 3300. Third inspection assembly 3300 may include a third controller, a third puck 3310 disposed at third leveling station 1350, and a third vision mechanism 3320 disposed at third shooting station 1360.

Third puck 3310 is rotatably secured to third gantry 3330. The third portal 3330 may span the conveyor 1000. Third gantry 3330 primarily holds third puck 3310. The third door 3330 may have various suitable structures so long as the protective film passes under the third door 3330. Third puck 3310 and bearing surface 1100 of transporter 1000 may have a third predetermined gap. The axial direction of third puck 3310 may be perpendicular to transport direction X-X. That is, the axial direction of third puck 3310 may be parallel to lateral direction Y-Y. The third preset gap is larger than the thickness of the detected protective film in a certain range, and is mainly used for flattening the detected protective film to a certain extent when the detected protective film is warped, so that the detected protective film is positioned in the depth of field range of the third visual mechanism 3320, and the shooting quality of the third visual mechanism 3320 is ensured. Third puck 3310 has a sufficient width along lateral direction Y-Y that is perpendicular to transport direction X-X. Typically, the width of third pinch roller 3310 is greater than or equal to the width of the protective film under test such that each location on the protective film under test is compacted and leveled by third pinch roller 3310 after the protective film under test passes by third pinch roller 3310 in the transport direction X-X.

The third pressing wheel 3310 rotates when the measured protective film passes through the third preset gap, so that the measured protective film is flattened to be within the depth of field of the third vision mechanism 3320 through the third preset gap. Rotation of third puck 3310 may be driven by manual actuation, by a motor, or by any other suitable power.

The third vision mechanism 3320 may include a third light source and a third camera 3321. A grating may be disposed on the light emitting surface of the third light source, so that the light emitted from the light emitting surface irradiates the third photographing station 1360 through the grating. The direction of the raster (i.e., the direction in which the raster is projected at the third imaging station 1360) coincides with the conveyance direction X-X. The third camera 3321 may be used to capture a third captured image of the protective film under test transferred to the third capture station 1360. The third camera 3321 may be fixed to a fourth gantry 3340. The fourth door frame 3340 may span the conveyor 1000. Optionally, the third camera 3321 is connected to the fourth door frame 3340 in a lifting manner to adjust the height of the third camera 3321 relative to the bearing surface 1100, so as to obtain a clear third captured image. The third camera 3321 may be a line scan camera. The conveying device 1000 conveys the tested protective film along the conveying direction X-X, the third camera 3321 shoots a row of pictures of the tested protective film, the width of the row of pictures corresponds to the line scanning width of the third camera 3321, and finally the pictures are spliced into a complete picture of the tested protective film.

The third controller is used for determining whether the detected protective film has a third type of defect according to the third shot image. In some embodiments, the third type of defect may include at least one of: crease and vertical line are concave. The vertical line recess extends in a direction parallel to the conveying direction X-X.

In the defect detection device for a protective film provided by the embodiment of the invention, when the conveying device 1000 conveys the protective film to be detected to the third leveling station 1350, the third pressing wheel 3310 and the bearing surface 1100 of the conveying device 1000 flatten the protective film to be detected, so that the protective film to be detected is positioned in the depth of field of the third vision mechanism 3320, and the third camera 3321 can immediately shoot the flattened protective film to be detected, thereby avoiding the recovery of the warp of the protective film to be detected under the action of self elasticity before shooting; a third type of defect may be identified by an image captured by the third vision mechanism 3320 with a raster. Because the quality of the third shot image is higher, the interference on detecting the third type of defects is smaller, and the third controller can accurately determine whether the detected protective film has the third type of defects or not, and the accuracy of detecting the third type of defects is higher. Therefore, compared with the prior art, the defect detection device of the detected protective film does not need personnel to participate, so that human-caused errors can be avoided, the detection efficiency is higher, the accuracy is higher, the labor cost is reduced, and the market competitiveness is higher.

When the conveying device 1000 conveys the tested protective film to the third leveling station 1350, the third pressing wheel 3310 and the bearing surface 1100 of the conveying device 1000 can press the tested protective film together, so that the tested protective film can be flattened, and further, the warpage phenomenon of the tested protective film can be avoided. Because the depth of field of the third vision mechanism 3320 is adjacent to the third leveling station 1350, the third camera 3321 can immediately shoot the flattened tested protective film, so that the tested protective film can be prevented from being warped under the action of elasticity. Therefore, the quality of the third captured image is higher and less disturbing to detect defects of the third type. Based on the above, the third controller can accurately determine whether the detected protective film has the third type of defects, and the accuracy of detecting the third type of defects is high.

For example, as shown in fig. 1-2 and 13, the conveyor 1000 may also include a roller conveyor line 1800. The roller conveying line 1800 may be used to convey the protective film under test in the conveying direction X-X. The roller conveyor line 1800 and the belt conveyor line 1600 may be disposed in sequence along the conveying direction X-X. In the embodiment shown in the figures, the roller conveyor line 1800 may be located between two belt conveyor lines 1600. The inspection station 1300 may include a laminating station 1370 and a fourth photographing station 1380 on the roller conveyor line 1800 in the conveying direction X-X. The fourth photographing station 1380 may be adjacent to the laminating station 1370. The detection device 3000 may also include a fourth detection assembly 3400. The fourth detection assembly 3400 may include a pinch roller 3410, a fourth vision mechanism 3420, and a fourth controller. The laminating roller 3410 may be used to flatten the protective film being tested at the laminating station with the roller conveyor line 1800. The fourth vision mechanism 3420 may be used to capture the protective film under test transferred to the fourth capture station 1380 to obtain a fourth captured image. The fourth controller may be configured to determine whether the protective film under test has a fourth type of defect from the fourth captured image. Illustratively, the fourth type of defect may include a dimple. So set up, the defect detection equipment of protection film can detect more types of defects, and its function is abundanter.

The positional relationship among the first sensing component 3100, the second sensing component 3200, the third sensing component 3300 and the fourth sensing component 3400 in the conveying direction X-X may be arbitrary. Desirably, the first sensing assembly 3100, the second sensing assembly 3200, the third sensing assembly 3300 and the fourth sensing assembly 3400 may be sequentially disposed along the conveying direction X-X.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front", "rear", "upper", "lower", "left", "right", "transverse", "vertical", "horizontal", and "top", "bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely for convenience of describing the present invention and simplifying the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, without limiting the scope of protection of the present invention; the orientation terms "inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

For ease of description, regional relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein to describe regional positional relationships of one or more components or features to other components or features illustrated in the figures. It will be understood that the relative terms of regions include not only the orientation of the components illustrated in the figures, but also different orientations in use or operation. For example, if the element in the figures is turned over entirely, elements "over" or "on" other elements or features would then be included in cases where the element is "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". Moreover, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and all such cases are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The present invention has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the invention to the embodiments described. In addition, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the invention, which variations and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A defect detecting apparatus for a protective film, comprising:

the conveying device is used for conveying the tested protective film along the conveying direction and is provided with a feeding station, a detection station and a discharging station along the conveying direction;

the feeding device is used for placing the laminated tested protective films and transferring the top tested protective film in the laminated tested protective films to the feeding station;

the detection device is used for detecting whether the detected protective film transmitted to the detection station has defects or not; and

and the blanking device is used for blanking the tested protective film conveyed to the blanking station.

2. The defect detecting apparatus of protective film according to claim 1, wherein the feeding device comprises a limit post and a transfer assembly, the limit post has a limit space, the limit space is used for placing the laminated protective film to be detected, the limit post is provided with an air blowing hole, the air blowing hole is used for blowing air to the abutting part between the top layer protective film to be detected and the adjacent protective film to be detected, the transfer assembly comprises at least two adsorption mechanisms used for adsorbing the top layer protective film to be detected and placing the top layer protective film to the feeding station, and the at least one adsorption mechanism is used for shaking the top layer protective film to be detected up and down along the gravity direction after adsorbing the top layer protective film to be detected.

3. The defect detecting apparatus of a protective film according to claim 1, wherein the conveying device further has a surface dust removing station between the feeding station and the detecting station in the conveying direction, the defect detecting apparatus of a protective film further comprising a surface dust removing device at the surface dust removing station for surface dust removing the protective film to be detected conveyed to the surface dust removing station.

4. The apparatus for detecting defects of a protective film according to claim 1, wherein the conveyor includes a belt conveyor line for conveying the protective film to be detected in the conveying direction, the belt conveyor line having the feeding station, the detecting station, and the discharging station in the conveying direction, and a dust-sticking assembly for dusting the belt conveyor line.

5. The apparatus for detecting defects of a protective film according to claim 4, wherein the dust-sticking assembly is located below the belt conveyor line, the dust-sticking assembly includes a holder mechanism including a holder, an elastic member, and a mount member for mounting the dust-sticking member, the mount member being movable between a dust removing station and a spacing station, the dust-sticking member abutting against a bottom of the belt conveyor line to remove dust from the belt conveyor line when the mount member is located at the dust removing station, the dust-sticking member being spaced apart from the belt conveyor line when the mount member is located at the spacing station, the elastic member being connected between the bottom of the holder and the bottom of the mount member, the elastic member exerting an elastic force against the mount member toward the dust removing station, the spacing plate being held at a spacing position between a top of the holder and a top of the mount member to cause the mount member to be located at the spacing station, and the spacing plate being in an idle position to cause the mount member to be located at the dust removing station.

6. The defect detecting apparatus of a protective film according to claim 1, wherein the detecting station includes a first leveling station and a first photographing station in the conveying direction, the first leveling station includes a lamination sub-station, the first photographing station is adjacent to the lamination sub-station, the detecting device includes a first detecting assembly including a first controller, a lamination provided at the lamination sub-station, and a first vision mechanism provided at the first photographing station, a first end of the lamination is pressed against a bearing surface of the conveying device so that the lamination has an arc surface protruding toward the bearing surface of the conveying device and so that a protective film to be detected can be conveyed between the arc surface and the bearing surface, the first vision mechanism is used for photographing the protective film to be detected conveyed to the first photographing station from between the arc surface and the bearing surface, a first photographed image is obtained, and the first controller is used for determining whether the protective film to be detected has a first class of defects in the protective film based on the first photographed image.

7. The apparatus for inspecting defects of a protective film according to claim 1, wherein the protective film to be inspected comprises at least two laminated film layers, the inspection station comprises a second leveling station and a second photographing station along the conveying direction, the second photographing station is adjacent to the second leveling station, the inspection device comprises a second inspection assembly, the second inspection assembly comprises a second controller, a second pressing wheel positioned at the second leveling station, and a second vision mechanism positioned at the second photographing station, the second pressing wheel and a carrying surface of the conveying device have a second preset gap, the second pressing wheel is used for flattening the protective film to be inspected conveyed to the second leveling station after being flattened through the second preset gap, the second vision mechanism is used for photographing the protective film to be inspected conveyed to the second photographing station, and a second photographed image is obtained, and the second controller is used for determining whether the protective film to be inspected has a second type of defects in the defects according to the second photographed image.

8. The apparatus according to claim 1, wherein the inspection station includes a third leveling station and a third photographing station in the conveying direction, the third photographing station being adjacent to the third leveling station, the inspection device includes a third inspection module including a third controller, a third pressing wheel located at the third leveling station, and a third vision mechanism located at the third photographing station, the third pressing wheel having a third preset gap with a carrying surface of the conveying device, an axial direction of the third pressing wheel being perpendicular to the conveying direction, the third pressing wheel being rotated when the protective film to be inspected passes through the third preset gap so that the protective film to be inspected is flattened to within a depth of field of the third vision mechanism via the third preset gap, the third vision mechanism including a third light source and a third camera, a grating being provided on a light-emitting surface of the third light source so that light emitted through the light-emitting surface passes through the grating, the grating being oriented to the third pressing wheel, and the third vision mechanism having a third preset gap, the third pressing wheel having a direction of the third vision mechanism being oriented to be inspected, the third vision mechanism being oriented to be inspected to a third vision mechanism, the third vision mechanism being oriented to be inspected to a depth of vision of the protective film is inspected, and the third vision mechanism being inspected is inspected, and the third vision film is inspected, and the inspection film is inspected.

9. The defect detecting apparatus of a protective film according to claim 1, wherein the conveying device includes a roller conveying line for conveying the protective film to be detected in the conveying direction, the detecting station includes a laminating station and a fourth photographing station on the roller conveying line in the conveying direction, the detecting device includes a fourth detecting assembly including a laminating roller for flattening the protective film to be detected located at the laminating station, a fourth vision mechanism, and a fourth controller, the fourth photographing station is adjacent to the laminating station; the fourth vision mechanism is used for shooting the tested protective film transmitted to the fourth shooting station to obtain a fourth shooting image, and the fourth controller is used for determining whether the tested protective film has a fourth type of defects in the defects according to the fourth shooting image.

10. The defect detecting apparatus of a protective film according to claim 1, wherein the protective film to be detected comprises a PS protective film.