Glass surface inspection apparatus and method

Abstract

The application relates to a glass surface detection device and method. The device comprises a surface treatment generator, an image acquisition mechanism and a controller. The surface treatment generator is used to attach a revealing material to the surface of the glass to improve the recognizability of the defective part of the surface of the glass. The image acquisition mechanism is used to acquire the image of the surface of the glass with the revealing material attached thereto. The controller is used to determine whether the surface of the glass is defective according to the image. The glass surface detection device can improve the recognizability of the defects such as the trace liquid contaminant, the solid micro-particle and the trace impurity attached to the surface of the glass. The controller can determine whether the surface of the glass is defective according to the image, so that the defects such as the trace liquid contaminant, the solid micro-particle and the trace impurity can be directly detected, automatic online detection can be realized, the cost can be reduced, the detection efficiency can be improved, and the waste product rate can be reduced.

Description

Technical Field

[0001] This application relates to the field of glass surface inspection technology, and in particular to a glass surface inspection device and method. Background Technology

[0002] With the rapid development of glass, its application in various fields such as automobiles, electronic products, and building construction is becoming increasingly widespread, and the requirements for the surface quality of glass are also becoming higher and higher. Taking its application in the automotive field as an example, the coated substrate (i.e., uncoated glass) in related technologies is usually inspected for surface defects using defect inspection methods such as optical inspection and thermal inspection.

[0003] The inspection equipment using the optical imaging method includes a photoelectric switch, a high-intensity light source, a sampling camera, an analysis system, and a conveyor belt. In operation, a cleaned coated sheet is provided and fed into the inspection equipment via the conveyor belt. When the sheet passes the photoelectric switch, the high-intensity light source and sampling camera are activated. The high-intensity light shines on the glass surface, making defects visible, and the image acquisition mechanism captures these defects. The analysis system then provides the analysis results, which are fed back to the original sheet to confirm the inspection outcome. However, when the glass surface contains trace amounts of liquid contaminants, solid microparticles, or trace impurities, the optical imaging method cannot detect these defects due to their unique characteristics, such as low content, low optical contrast, and small differences in chemical composition.

[0004] Based on this, in order to detect defects such as trace liquid contaminants, solid microparticles, and trace impurities on the glass surface, inspection equipment using the thermal inspection method has been developed. This equipment includes a heating furnace and transfer rollers. In use, a coating film is applied to the surface of the glass substrate through a coating process, resulting in coated glass. The coated glass is then transferred to the heating furnace via the transfer rollers, heated, and then flows out. An operator inspects the surface of the heated coated glass to determine if the substrate has surface defects and whether it is suitable for coating.

[0005] However, when there are surface defects on the coated substrate that are not visible to the naked eye, the optical inspection method cannot detect them. While the thermal inspection method can detect defects, it requires visual inspection by the operator, which places high demands on the operator. Furthermore, the defects need to be detected after coating and heat treatment, which makes the defect inspection process lagging, and a large number of scrap products have already been produced by the time the defects are detected. Summary of the Invention

[0006] Therefore, it is necessary to provide a glass surface inspection device and method to address the problems that related technologies cannot directly detect defects such as trace liquid contaminants, solid microparticles, and trace impurities, the inspection results are delayed, defective and waste products are produced in batches, thermal inspection cannot achieve online inspection, and have extremely high requirements for the operator's inspection experience.

[0007] On one hand, this application provides a glass surface inspection device, comprising:

[0008] A surface treatment generator is used to provide a revealing material and cause the revealing material to adhere to the surface of the glass to be inspected, so as to improve the identifiability of surface defects in the glass.

[0009] An image acquisition mechanism, wherein the image acquisition mechanism is used to acquire an image of the surface of the glass to which the display material is attached; and

[0010] The controller is electrically connected to both the surface treatment generator and the image acquisition mechanism. The controller is used to determine whether there are defects on the surface of the glass based on the image.

[0011] In one embodiment, the revealing material comprises a wetting liquid.

[0012] In one embodiment, the wetting liquid includes any one or more combinations of water, isopropyl ketone, ethanol, fluorescent liquid, and silicone oil.

[0013] In one embodiment, the surface treatment generator includes a spraying section for spraying the display material onto the surface of the glass; or, the surface treatment generator includes a wiping section for wiping the display material onto the surface of the glass.

[0014] In one embodiment, the spraying section forms a spray; the atomization diameter of the spray is 10μm~100μm, or 20μm~40μm; the atomization density of the spray is 50 particles / cm³. 3 ~500 pieces / cm 3 Or 150 per cm 3 ~250 pieces / cm 3 The atomization uniformity of the spray requires a droplet diameter deviation of ≤30% or ≤10%.

[0015] In one embodiment, the image acquisition mechanism includes an acquisition camera and an inspection light source; both the acquisition camera and the inspection light source are electrically connected to the controller; the inspection light source is used to illuminate glass with the display material attached to its surface, and the acquisition camera is used to acquire an image of the surface of the glass.

[0016] In one embodiment, the glass surface detection device further includes a surface cleaner for removing the revealing material adhering to the surface of the glass; the surface cleaner is electrically connected to the controller.

[0017] In one embodiment, the surface cleaner includes a drying section for drying the surface of the glass to remove the display material.

[0018] In one embodiment, the drying unit includes a ventilator for delivering hot air to the surface of the glass to dry and remove the display material on the surface of the glass.

[0019] In one embodiment, the surface cleaner includes a cleaning section for spraying cleaning fluid onto the surface of the glass to remove the display material.

[0020] In one embodiment, the glass surface inspection device further includes a transmission mechanism; the transmission mechanism is used to carry and transmit the glass, and the surface treatment generator, the image acquisition mechanism, and the surface cleaner are arranged sequentially along the transmission direction of the transmission mechanism.

[0021] In one embodiment, the transmission mechanism includes a support and a plurality of transmission rollers, the plurality of transmission rollers being arranged sequentially at intervals along the transmission direction and rotatably connected to the support.

[0022] In one embodiment, the glass surface inspection device further includes a first sensor, a second sensor, and a third sensor, all of which are electrically connected to the controller. The first sensor, the second sensor, and the third sensor are arranged sequentially at intervals along the transmission direction. The first sensor is used to sense whether the glass has moved to the surface treatment position, and the controller is used to control the surface treatment generator to operate when the first sensor senses that the glass has moved to the surface treatment position. The second sensor is used to sense whether the glass has moved to the inspection position, and the controller is used to control the image acquisition mechanism to operate when the second sensor senses that the glass has moved to the inspection position. The third sensor is used to sense whether the glass has moved to the cleaning position, and the controller is used to control the surface cleaner to operate when the third sensor senses that the glass has moved to the cleaning position.

[0023] In one embodiment, the distance between the edges of the surface treatment generator and the image acquisition mechanism that are close to each other along the transmission direction is S1, 3cm≤S1≤10cm; and / or,

[0024] The distance between the edges of the image acquisition mechanism and the surface cleaner that are close to each other along the transmission direction is S2, where 3cm≤S2≤10cm.

[0025] On the other hand, this application also provides a method for detecting glass surfaces, comprising the following steps:

[0026] A display material is provided and the display material is attached to the surface of the glass to be inspected to improve the identifiability of surface defects in the glass.

[0027] Acquire an image of the surface of the glass with the display material attached;

[0028] Determine whether the surface of the glass has defects based on the image.

[0029] In one embodiment, the revealing material comprises a wetting liquid.

[0030] In one embodiment, the wetting liquid includes any one or more combinations of water, isopropyl ketone, ethanol, fluorescent liquid, and silicone oil.

[0031] In one embodiment, the step of attaching the display material to the surface of the glass to be tested includes: spraying the display material onto the surface of the glass.

[0032] In one embodiment, the revealing material is ejected to form a spray; the atomization diameter of the spray is 10 μm to 100 μm, or 20 μm to 40 μm; the atomization density of the spray is 50 atomization particles / cm³. 3 ~500 pieces / cm 3 Or 150 per cm 3 ~250 pieces / cm 3 The atomization uniformity of the spray requires a droplet diameter deviation of ≤30% or ≤10%.

[0033] In one embodiment, after the step of acquiring an image of the surface of the glass with the display material attached, the method further includes the step of:

[0034] Remove the display material adhering to the surface of the glass.

[0035] In one embodiment, the step of removing the display material adhering to the surface of the glass includes: drying the surface of the glass to remove the display material.

[0036] In one embodiment, the step of drying the surface of the glass to remove the display material includes: outputting hot air to the surface of the glass to dry and remove the display material on the surface of the glass.

[0037] In one embodiment, the temperature of the hot air is ≥100°C, or 120°C to 200°C.

[0038] In one embodiment, the step of removing the display material adhering to the surface of the glass includes spraying a cleaning solution onto the surface of the glass to remove the display material.

[0039] In one embodiment, the step of removing the display material adhering to the surface of the glass further includes the step of:

[0040] The glass that is determined to be defective is then transported to the re-inspection area;

[0041] The glass that is determined to be free of defects is transported to the coating position, where it is coated using the coating equipment.

[0042] In one embodiment, the step of cleaning the glass is included before the step of attaching the display material to the surface of the glass to be tested.

[0043] The aforementioned glass surface inspection device and method, when the glass surface has various defects such as trace liquid contaminants, solid microparticles, and trace impurities, the display material attached to the glass surface can improve the identifiability of the defects. The controller can determine whether there are defects on the glass surface based on the image acquired by the image acquisition mechanism, thereby directly detecting various defects such as trace liquid contaminants, solid microparticles, and trace impurities. It can achieve automatic online inspection, reduce costs, improve inspection efficiency, and reduce scrap rate. Attached Figure Description

[0044] Figure 1 This is a structural diagram of a glass surface inspection device according to an embodiment of this application.

[0045] Figure 2 This is a structural diagram showing the surface defects of glass in an embodiment of this application, where liquid droplets are difficult to adhere to.

[0046] Figure 3 This is a structural diagram of a glass surface defect where droplets accumulate, according to an embodiment of this application.

[0047] 10. Surface treatment generator; 20. Image acquisition mechanism; 30. Surface cleaner; 40. Transmission mechanism; 41. Support; 42. Transmission roller; 50. Glass. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] Defect inspection methods in related technologies are mostly used to inspect surface defects, especially optical inspection, such as scratches on the surface of the original wafer, solder spots, bubbles inside the original wafer, edge bursts, missing corners and other defects visible to the naked eye. In other words, defect inspection methods in related technologies are usually aimed at inspecting visible defects on the surface of the coated original wafer.

[0050] However, if the surface of the original coated film contains invisible defects, such as trace amounts of liquid contaminants, solid microparticles, or trace impurities, these defects, due to their special characteristics (such as low content, low optical contrast, and small differences in chemical composition), can only be detected by thermal inspection. The typical operating temperature is 580℃~630℃, and the inspection principle is as follows:

[0051] Ⅰ. After heat treatment, liquid contaminants will evaporate, diffuse, or wet the coating layer, forming visible halos or spots;

[0052] II. If the melting point of solid microparticles is lower than the heat treatment temperature, they will melt and spread on the surface of the film, forming obvious marks.

[0053] III. Trace impurities on the film layer itself or the surface of the original film may undergo chemical reactions under the high temperature conditions of heat treatment, potentially forming carbonization marks or generating oxides or hydroxides. The optical properties (such as color and refractive index) of these new substances differ greatly from those of the original film layer, thus appearing as stains.

[0054] In summary, if there are defects on the surface of the coated substrate that are invisible to the naked eye, optical inspection methods cannot detect them, while thermal inspection methods can. However, thermal inspection requires visual inspection by the operator, which places high demands on the operator; furthermore, defects need to be detected after coating and heat treatment, making the defect inspection process delayed, and a large number of scrap products may have already been produced by the time defects are detected.

[0055] Based on the above reasons, this application provides a glass surface inspection device and method that can directly detect various defects such as trace liquid contaminants, solid microparticles, and trace impurities. It can achieve automatic online inspection, reduce costs, improve inspection efficiency, and thus reduce the scrap rate.

[0056] It should be noted that the glass in this embodiment is either a coated sheet or coated glass, etc., and is not limited thereto. This embodiment will specifically use glass as a coated sheet as an example, but it is not a limitation.

[0057] The following will combine Figures 1 to 3 The glass surface detection apparatus and method in one embodiment of this application will be described in detail.

[0058] See Figure 1 , Figure 1 This diagram illustrates the structure of a glass surface inspection device according to an embodiment of this application. The glass surface inspection device includes a surface treatment generator 10, an image acquisition mechanism 20, and a controller. The surface treatment generator 10 provides a display material and attaches it to the surface of the glass 50 to be inspected, thereby improving the identifiability of surface defects on the glass 50. The image acquisition mechanism 20 acquires images of the glass 50 surface with the display material attached. Both the surface treatment generator 10 and the image acquisition mechanism 20 are electrically connected to the controller, which determines whether the surface of the glass 50 has defects based on the images.

[0059] The aforementioned glass surface inspection device can improve the identifiability of defects when the surface of glass 50 has various defects such as trace liquid contaminants, solid microparticles, and trace impurities. The display material attached to the surface of glass 50 can improve the identifiability of defects. The controller can determine whether the surface of glass 50 has defects based on the image acquired by the image acquisition mechanism 20, thereby directly detecting various defects such as trace liquid contaminants, solid microparticles, and trace impurities. It can achieve automatic online inspection, reduce costs, improve inspection efficiency, and reduce scrap rate.

[0060] Based on the aforementioned embodiments, the revealing material includes a wetting liquid. The wetting liquid adheres to the surface of the glass 50, forming different "wetting morphologies" in the defect area and the normal area. That is, it is difficult to adhere to or accumulate at the surface defect, thereby changing the optical contrast, surface morphology, etc. of the defect area and the normal area, making the defect area easier to identify and achieving the purpose of revealing the defect.

[0061] Specifically, the wetting liquid includes, but is not limited to, any one or more combinations of water, isoacetone, ethanol, fluorescent liquid, and silicone oil. The specific liquid can be adjusted and set according to actual needs, and there are no restrictions here, as long as it can improve the identifiability of defective parts on the surface of the glass 50.

[0062] Among these, materials such as isopropyl ketone, ethanol, fluorescent liquids, and silicone oil cause significant contamination to the surface of glass 50 and are prone to leaving residues that are difficult to clean. Therefore, specifically, water is preferred as the display material in this embodiment.

[0063] The water used includes both ordinary water and purified water. Ordinary water, also known as mineral water, contains natural minerals, trace additives, and trace impurities. When ordinary water is applied to the surface of glass 50, the natural minerals, trace additives, and trace impurities in the ordinary water are likely to cause secondary contamination of the glass 50 surface. Furthermore, after surface cleaning, these natural minerals, trace additives, and trace impurities will remain on the glass 50 surface, causing a certain degree of contamination and requiring further cleaning. Therefore, in this embodiment, purified water is preferred as the development material to ensure detection effect and efficiency. Of course, ordinary water can also be used as the development material as an alternative.

[0064] For example, when the display material is water, the spraying method results in uniform application and fast surface treatment. Therefore, the surface treatment generator 10 in this embodiment preferably has a spraying function and sprays the display material onto the surface of the glass 50 using a spraying method.

[0065] Based on the aforementioned embodiments, the surface treatment generator 10 includes a spraying section. The spraying section is used to spray a developing material onto the surface of the glass 50. Compared to wiping, the developing material can be sprayed evenly and quickly onto the surface of the glass 50, which is beneficial for improving inspection efficiency. Furthermore, after the developing material is sprayed onto the surface of the glass 50, it penetrates to reach the defect location, achieving the effect of defect visualization.

[0066] To improve the uniformity and efficiency of the spraying process, the number of spraying units is not limited to one, but can be multiple, including but not limited to two, three, four, or more. Optionally, the multiple spraying units correspond one-to-one with multiple portions of the surface of the glass 50. Furthermore, the multiple spraying units are arranged sequentially along a direction perpendicular to the running direction of the glass 50. When the glass 50 passes over the surface processor, the entire surface of the glass 50 can be uniformly sprayed with the development material.

[0067] Of course, in another embodiment, the surface treatment generator 10 includes a wiping section. The wiping cloth includes, but is not limited to, cotton cloth or silicone cloth. The wiping section is used to wipe the developing material onto the surface of the glass 50. After the wiping section wipes and applies the developing material onto the surface of the glass 50, the developing material penetrates to the defect site, achieving the effect of revealing the defect.

[0068] Based on the aforementioned embodiments, the wiping part is, for example, a wiping strip, and the extending direction of the wiping part is perpendicular to the running direction of the glass 50. When the glass 50 runs past the surface processor, the entire surface of the glass 50 can be uniformly wiped with the display material.

[0069] Experiments have shown that the amount of liquid wiped over a specific area of ​​the glass 50 surface during the wiping process affects the display effect of the display material. Therefore, by reasonably controlling and adjusting the amount of liquid used during the wiping process of the glass 50 surface, the display effect of the display material can be adjusted and optimized. As an example, the surface of the glass 50 can be divided into multiple areas of equal size, for example, partitioned into 200*200 sections; and each area can be wiped with the same amount of liquid, with the liquid volume for each area being relatively small, controlled at the milliliter level, so that the liquid is more evenly applied to the surface of the glass 50. Optionally, the liquid volume for each area can be controlled, for example, between 2 ml and 5 ml.

[0070] Optionally, the image acquisition mechanism 20 includes an acquisition camera or a video camera, etc. In this embodiment, the image acquisition mechanism 20 specifically includes an acquisition camera, which can acquire images of the surface of the glass 50. The acquisition camera is electrically connected to the controller, performs image acquisition under the control of the controller, and can transmit the acquired images to the controller.

[0071] Based on the aforementioned embodiments, the image acquisition mechanism 20 further includes an inspection light source. The inspection light source is used to illuminate the glass 50 on which a revealing material is attached. The inspection light source is electrically connected to a controller. When image acquisition is required, the controller controls the inspection light source to operate, enabling it to illuminate the surface of the glass 50, improving the visibility of defects. By acquiring images through a camera, the controller can more easily obtain results from the images and more accurately determine whether the surface of the glass 50 has defects.

[0072] For example, the glass surface inspection device also includes a surface cleaner 30. The surface cleaner 30 is used to remove the developing material adhering to the surface of the glass 50. Specifically, the surface cleaner 30 is electrically connected to the controller. After the inspection of the glass 50 is completed, the surface cleaner 30 performs a cleaning operation to remove the developing material adhering to the surface of the glass 50, so as to ensure the quality of the coating surface and avoid the degradation of the coating surface quality, resulting in coating layer quality defects.

[0073] The surface cleaner 30 can clean the display material adhering to the surface of the glass 50 by drying, or remove the display material by cleaning with a cleaning solution, or other methods. There are no restrictions on the specific method, and it can be flexibly adjusted and set according to actual needs.

[0074] For example, the surface cleaner 30 includes a drying section. The drying section is arranged opposite to the glass 50. The drying section is used to dry the surface of the glass 50 to remove the developing material. In this way, the drying section can dry the developing material adhering to the surface of the glass 50, thereby achieving a cleaning effect. In particular, when the developing material is pure water, the pure water will leave no residue on the surface of the glass 50 after drying.

[0075] The drying method in this embodiment includes, but is not limited to, various methods such as thermal radiation or hot air drying, and is not limited herein. Among these, thermal radiation drying results in poorer uniformity than hot air drying, and thermal radiation drying tends to leave surface-treated development material residue on the glass 50 surface. Therefore, hot air drying is preferred in this embodiment. Hot air drying not only provides better drying uniformity but also reduces the amount of surface-treated development material residue on the glass 50 surface.

[0076] In some embodiments, the drying unit includes a ventilation component. The ventilation component includes, but is not limited to, a ventilation duct or a nozzle. The number of ventilation components is not limited to one, two, three, or any other arbitrary number. The air outlet of the ventilation component is opposite to the surface of the glass 50, and the output hot air acts on the surface of the glass 50, drying and removing the display material on the surface of the glass 50.

[0077] Of course, as an alternative, when the display material is not pure water, in order to improve the cleaning effect on the surface of the glass 50 and avoid the ineffectiveness of drying in cleaning residual display material on the surface of the glass 50, the surface cleaner 30 preferably removes the display material by cleaning with a cleaning solution. For example, the surface cleaner 30 includes a cleaning unit for spraying cleaning solution onto the surface of the glass 50 to remove the display material. Specifically, the cleaning method used by the surface cleaner 30 can be achieved by spraying or vibration cleaning; the specific method is not limited here and can be selected according to actual needs.

[0078] Based on the aforementioned embodiments, the glass surface inspection device further includes a transmission mechanism 40. The transmission mechanism 40 is used to carry and transmit the glass 50. The surface treatment generator 10, image acquisition mechanism 20, and surface cleaner 30 are arranged sequentially along the transmission direction of the transmission mechanism 40. Furthermore, the surface treatment generator 10, image acquisition mechanism 20, and surface cleaner 30 can each be arranged either above or below the transmission mechanism 40; no limitation is imposed here. During the transmission of the glass 50 through the transmission mechanism 40, it will sequentially pass through the surface treatment generator 10, image acquisition mechanism 20, and surface cleaner 30. Furthermore, as the glass 50 passes through the surface treatment generator, a development material adheres to its surface; the image acquisition mechanism 20 acquires images and determines whether defects exist; and the surface cleaner 30 cleans the surface, resulting in high inspection efficiency and a reduced scrap rate.

[0079] In some embodiments, the transmission mechanism 40 includes a support 41 and a plurality of transmission rollers 42. The plurality of transmission rollers 42 are arranged sequentially at intervals along the transmission direction and are rotatably connected to the support 41. The glass 50 is placed above the transmission rollers 42 and runs at a stable speed along the transmission direction under the rotation drive of the transmission rollers 42, and can sequentially pass through the surface treatment generator 10, the image acquisition mechanism 20 and the surface cleaner 30.

[0080] In some embodiments, the glass surface inspection device further includes a first sensor, a second sensor, and a third sensor. The first, second, and third sensors are all electrically connected to a controller. The first, second, and third sensors are arranged sequentially at intervals along the transmission direction. The first sensor is used to sense whether the glass 50 has moved to the surface treatment position, and the controller is used to control the surface treatment generator to operate when the first sensor senses that the glass 50 has moved to the surface treatment position. The second sensor is used to sense whether the glass 50 has moved to the inspection position, and the controller is used to control the image acquisition mechanism 20 to operate when the second sensor senses that the glass 50 has moved to the inspection position. The third sensor is used to sense whether the glass 50 has moved to the cleaning position, and the controller is used to control the surface cleaner 30 to operate when the third sensor senses that the glass 50 has moved to the cleaning position.

[0081] Of course, as some optional solutions, it is not necessary to set up a first sensor, a second sensor, and a third sensor. Specifically, the transmission mechanism 40, the surface treatment generator 10, the image acquisition mechanism 20, and the surface cleaner 30 are all electrically connected to the controller and work in coordination under the control of the controller to sequentially realize the actions of glass 50 transmission, surface treatment, image acquisition and inspection, and surface cleaning.

[0082] In some embodiments, the distance between the edges of the surface treatment generator and the image acquisition mechanism 20 that are close to each other along the transmission direction is S1, where 3cm ≤ S1 ≤ 10cm. Specifically, S1 can be, for example, 3cm, 5cm, 6cm, 7cm, 8cm, 9cm, or 10cm. When the distance S1 is greater than 10cm, the detection effect is poor; when the distance S1 is less than 3cm, the distance between the image acquisition mechanism 20 and the surface processor is too close, which will interfere with the detection and cleaning process.

[0083] In some embodiments, the distance between the edges of the image acquisition mechanism 20 and the surface cleaner 30 that are close to each other along the transmission direction is S2, where 3cm ≤ S2 ≤ 10cm. Specifically, S2 can be, for example, 3cm, 5cm, 6cm, 7cm, 8cm, 9cm, or 10cm. When the distance S2 is greater than 10cm, surface cleanliness cannot be guaranteed; when the distance S2 is less than 3cm, the distance between the image acquisition mechanism 20 and the surface cleaner 30 is too close, which will affect the detection effect.

[0084] Please see Figures 1 to 3 In some embodiments, this application also provides a glass surface inspection method, comprising the following steps:

[0085] Step S110: Provide a display material and attach the display material to the surface of the glass 50 to be inspected to improve the identifiability of surface defects on the glass 50.

[0086] Specifically, the display material includes a wetting liquid. More specifically, the wetting liquid includes any one or more combinations of water, isoacetone, ethanol, fluorescent liquid, and silicone oil. In this embodiment, the display material is preferably pure water.

[0087] Step S120: Acquire an image of the surface of the glass 50 with the display material attached;

[0088] Step S130: Determine whether there are defects on the surface of glass 50 based on the image.

[0089] The above-described glass surface inspection method can improve the identifiability of defects when the surface of glass 50 has various defects such as trace liquid contaminants, solid microparticles, and trace impurities. The display material attached to the surface of glass 50 can improve the identifiability of defects. The controller can determine whether the surface of glass 50 has defects based on the image acquired by the image acquisition mechanism 20, thereby directly detecting various defects such as trace liquid contaminants, solid microparticles, and trace impurities. It can achieve automatic online inspection, reduce costs, improve inspection efficiency, and reduce scrap rate.

[0090] Based on the foregoing embodiments, the step of attaching the display material to the surface of the glass 50 to be tested includes: spraying the display material onto the surface of the glass 50.

[0091] The display material is sprayed out through the spraying section to form a spray. Extensive testing has shown that the atomization diameter, atomization density, and atomization uniformity of the spray can all affect the display effect of defects on the surface of glass 50.

[0092] For example, the atomization diameter is ≤100μm, specifically such as 10μm, 20μm, 25μm, 30μm, 35μm, 40μm, 60μm or 100μm, etc. The specific diameter can be flexibly adjusted and set according to actual needs, and there are no restrictions here.

[0093] In this embodiment, the atomization diameter is preferably set to 20μm~40μm. When the atomization diameter is greater than 40μm, droplets aggregate, such as... Figure 3 As shown, imaging is quite difficult; when the atomization diameter is less than 20μm, the droplets float and are difficult to adhere to the surface of the glass 50, resulting in poor imaging effect.

[0094] For example, the atomization density is ≤500 particles / cm³.3 For example, 50 per cm 3 100 pieces / cm 3 150 pieces / cm 3 200 pieces / cm 3 250 pieces / cm 3 300 pieces / cm 3 350 pieces / cm 3 400 pieces / cm 3 450 pieces / cm 3 Or 500 pieces / cm 3 The specific settings can be flexibly adjusted and configured according to actual needs, and no restrictions are imposed here.

[0095] In this embodiment, the atomization density is preferably set to 150 atomization points / cm². 3 ~250 pieces / cm 3 When the atomization density is greater than 250 particles / cm 3 When this occurs, a liquid film will form on the surface of the glass 50, making imaging difficult. When the atomization density is less than 150 particles / cm²... 3 At that time, the distribution uniformity was low, resulting in poor imaging effect.

[0096] For example, the atomization uniformity requirement is that the droplet diameter deviation be ≤30%, specifically 30%, 25%, 20%, 15%, 10%, 9%, 8%, 5%, 1%, etc. The specific value can be flexibly adjusted and set according to actual needs, and no restrictions are imposed here. When the droplet diameter deviation requirement is greater than 30%, the droplet uniformity is poor, resulting in poor imaging effects.

[0097] In this embodiment, the droplet diameter deviation is preferably ≤10% to ensure atomization uniformity. This results in better droplet uniformity and imaging performance.

[0098] The glass surface inspection devices used in the embodiments and comparative examples of this application were used for inspection, and the inspection results, namely the inspection effects on defects such as trace liquid contaminants, solid microparticles, and trace impurities, were statistically analyzed, as shown in the table below:

[0099]

[0100] As can be seen from the technical effects of the embodiments and comparative examples, the glass surface inspection device of the present application can detect defects such as trace liquid contaminants, solid microparticles, and trace impurities on the surface of glass 50, so as to ensure the quality of the glass 50 surface.

[0101] Based on the foregoing embodiments, after step S120, the method further includes:

[0102] Step S140: Remove the display material adhering to the surface of the glass 50.

[0103] Specifically, step S140 includes drying the surface of the glass 50 to remove the display material.

[0104] Specifically, the step of drying the surface of glass 50 to remove the display material includes: outputting hot air to the surface of glass 50 to dry and remove the display material on the surface of glass 50.

[0105] Optionally, the hot air temperature provided by the drying unit is ≥100℃, specifically, for example, 100℃, 120℃, 150℃, 1700℃, 180℃, 200℃, or 300℃. In this embodiment, the hot air temperature is preferably 120℃~200℃. Specifically, when the hot air temperature is below 120℃, the cleaning efficiency is low; when the hot air temperature is above 200℃, energy is wasted and costs are high.

[0106] When the display material is not pure water, in order to improve the cleaning effect on the surface of glass 50 and avoid the ineffectiveness of drying in cleaning residual display material on the surface of glass 50, in another embodiment, step S140 includes: spraying cleaning fluid onto the surface of glass 50 to remove the display material. This effectively removes the display material adhering to the surface of glass 50.

[0107] In some embodiments, step S140 is followed by:

[0108] Step S150: The glass 50 that is determined to be defective is transported to the re-inspection area;

[0109] Step S160: The glass 50 that is determined to be without defects is transported to the coating position, and the glass 50 is coated by the coating equipment.

[0110] In some embodiments, the step of cleaning the glass 50 is included before the step of attaching the display material to the surface of the glass 50 to be tested.

[0111] Specifically, after the surface of the glass 50 is cleaned by a washing machine before coating, it is driven into the inspection position by the transfer roller 42.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A glass surface inspection device, characterized in that, include: A surface treatment generator is used to provide a revealing material and cause the revealing material to adhere to the surface of the glass to be inspected, so as to improve the identifiability of surface defects in the glass. An image acquisition mechanism, wherein the image acquisition mechanism is used to acquire an image of the surface of the glass with the display material attached thereon; and The controller is electrically connected to both the surface treatment generator and the image acquisition mechanism. The controller is used to determine whether there are defects on the surface of the glass based on the image.

2. The glass surface inspection device according to claim 1, characterized in that, The revealing material includes a wetting liquid.

3. The glass surface inspection device according to claim 2, characterized in that, The wetting liquid includes any one or more combinations of water, isopropyl ketone, ethanol, fluorescent liquid, and silicone oil.

4. The glass surface inspection device according to claim 1, characterized in that, The surface treatment generator includes a spraying section for spraying the display material onto the surface of the glass; or, the surface treatment generator includes a wiping section for wiping the display material onto the surface of the glass.

5. The glass surface inspection device according to claim 4, characterized in that, The spraying section forms a spray; the atomization diameter of the spray is 10μm~100μm, or 20μm~40μm; the atomization density of the spray is 50 particles / cm³. 3 ~500 pieces / cm 3 Or 150 per cm 3 ~250 pieces / cm 3 The atomization uniformity of the spray requires a droplet diameter deviation of ≤30% or ≤10%.

6. The glass surface inspection device according to claim 1, characterized in that, The image acquisition mechanism includes an acquisition camera and an inspection light source; both the acquisition camera and the inspection light source are electrically connected to the controller; the inspection light source is used to illuminate the glass with the display material attached to its surface, and the acquisition camera is used to acquire an image of the surface of the glass.

7. The glass surface inspection device according to claim 1, characterized in that, The glass surface inspection device further includes a surface cleaner; the surface cleaner is used to remove the display material adhering to the surface of the glass; the surface cleaner is electrically connected to the controller.

8. The glass surface inspection device according to claim 7, characterized in that, The surface cleaner includes a drying section for drying the surface of the glass to remove the display material.

9. The glass surface inspection device according to claim 8, characterized in that, The drying unit includes a ventilation component for outputting hot air to the surface of the glass to dry and remove the display material on the surface of the glass.

10. The glass surface inspection device according to claim 7, characterized in that, The surface cleaner includes a cleaning section for spraying cleaning fluid onto the surface of the glass to remove the display material.

11. The glass surface inspection device according to claim 7, characterized in that, The glass surface inspection device further includes a transmission mechanism; the transmission mechanism is used to carry and transmit the glass, and the surface treatment generator, the image acquisition mechanism and the surface cleaner are arranged sequentially along the transmission direction of the transmission mechanism.

12. The glass surface inspection device according to claim 11, characterized in that, The transmission mechanism includes a support frame and multiple transmission rollers, which are arranged sequentially at intervals along the transmission direction and rotatably connected to the support frame.

13. The glass surface inspection device according to claim 11, characterized in that, The glass surface inspection device further includes a first sensor, a second sensor, and a third sensor, all of which are electrically connected to the controller. The first sensor, the second sensor, and the third sensor are arranged sequentially at intervals along the transmission direction. The first sensor is used to sense whether the glass has moved to the surface treatment position, and the controller is used to control the surface treatment generator to operate when the first sensor senses that the glass has moved to the surface treatment position. The second sensor is used to sense whether the glass has moved to the inspection position, and the controller is used to control the image acquisition mechanism to operate when the second sensor senses that the glass has moved to the inspection position. The third sensor is used to sense whether the glass has moved to the cleaning position, and the controller is used to control the surface cleaner to operate when the third sensor senses that the glass has moved to the cleaning position.

14. The glass surface inspection device according to claim 11, characterized in that, The distance between the edges of the surface treatment generator and the image acquisition mechanism that are close to each other along the transmission direction is S1, 3cm≤S1≤10cm; and / or, The distance between the edges of the image acquisition mechanism and the surface cleaner that are close to each other along the transmission direction is S2, where 3cm≤S2≤10cm.

15. A method for inspecting glass surfaces, characterized in that, Includes the following steps: A display material is provided and the display material is attached to the surface of the glass to be inspected to improve the identifiability of surface defects in the glass. Acquire an image of the surface of the glass with the display material attached; Determine whether the surface of the glass has defects based on the image.

16. The glass surface inspection method according to claim 15, characterized in that, The revealing material includes a wetting liquid.

17. The glass surface inspection method according to claim 16, characterized in that, The wetting liquid includes any one or more combinations of water, isopropyl ketone, ethanol, fluorescent liquid, and silicone oil.

18. The glass surface inspection method according to claim 15, characterized in that, The step of attaching the display material to the surface of the glass to be tested includes: spraying the display material onto the surface of the glass.

19. The glass surface inspection method according to claim 18, characterized in that, The revealing material is ejected to form a spray; the atomization diameter of the spray is 10μm~100μm, or 20μm~40μm; the atomization density of the spray is 50 particles / cm³. 3 ~500 pieces / cm 3 Or 150 per cm 3 ~250 pieces / cm 3 The atomization uniformity of the spray requires a droplet diameter deviation of ≤30% or ≤10%.

20. The glass surface inspection method according to claim 18, characterized in that, After the step of acquiring an image of the surface of the glass with the developing material attached, the method further includes the step of: Remove the display material adhering to the surface of the glass.

21. The glass surface inspection method according to claim 20, characterized in that, The step of removing the display material adhering to the surface of the glass includes: drying the surface of the glass to remove the display material.

22. The glass surface inspection method according to claim 21, characterized in that, The step of drying the surface of the glass to remove the display material includes: outputting hot air to the surface of the glass to dry and remove the display material on the surface of the glass.

23. The glass surface inspection method according to claim 22, characterized in that, The temperature of the hot air is ≥100℃, or 120℃ to 200℃.

24. The glass surface inspection method according to claim 20, characterized in that, The step of removing the display material adhering to the surface of the glass includes: spraying a cleaning solution onto the surface of the glass to remove the display material.

25. The glass surface inspection method according to claim 20, characterized in that, The step following the step of removing the display material adhering to the surface of the glass also includes the following step: The glass that is determined to be defective is then transported to the re-inspection area; The glass that is determined to be free of defects is transported to the coating position, where it is coated using a coating device.

26. The glass surface inspection method according to claim 15, characterized in that, The step prior to the step of attaching the display material to the surface of the glass to be tested includes: The glass is then cleaned.

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