Device and method for detecting flatness of carrier plate glass

Abstract

The invention discloses a planeness detection device for carrier glass, which comprises a light source and a camera, and is characterized in that the light source is arranged above a conveying roller way of the carrier glass and can emit an umbrella-shaped light beam perpendicular to the carrier glass, so that laser forms a linear light beam on the carrier glass; a light source is arranged on the conveying roller bed, a semitransparent measuring plate is arranged below the conveying roller bed and right faces the light source, the camera is arranged below the measuring plate and is arranged opposite to the light source, the light source and the camera are driven by a driving mechanism, and the driving mechanism is arranged in the transverse direction of the conveying roller bed; the device further comprises a processing mechanism, a neural network is installed in the processing mechanism, and the processing mechanism is used for detecting defects according to deformation of the linear light spots on the measuring plate. According to the device, the refractive index of the produced carrier plate glass can be automatically detected along with the line, the detection efficiency is higher, complete detection is achieved, unqualified parts can be marked, and the unqualified carrier plate glass can be conveniently recycled.

Description

Technical Field

[0001] The present application belongs to the field of carrier glass production, and in particular relates to a flatness detection device and a detection method for carrier glass. Background Art

[0002] Carrier glass is mainly used as the substrate of display screens. It needs to go through multiple processes such as melting, forming, cooling, cutting, polishing, etc., and finally the carrier glass is subjected to various tests before the production of carrier glass is completed.

[0003] Among the various properties of carrier glass, flatness is one of the most important indicators. In the prior art, the flatness detection of carrier glass is mostly carried out by using a flatness detector. Since the use of the flatness detector is relatively complicated, it is impossible to fully detect all carrier glass, and sampling detection is required. In addition, only a few areas are randomly detected during the detection, and a comprehensive detection cannot be achieved. For large-scale carrier glass, due to the limitation of the production process, the density, material, etc. may be uneven during the production process, affecting the flatness of a certain place. The above detection method is difficult to truly achieve a comprehensive inspection, resulting in the inability to guarantee product quality.

[0004] Therefore, a new type of flatness detection device or detection method for carrier glass is needed to solve the above problems. Summary of the invention

[0005] In order to address the deficiencies of the prior art, the present application provides a flatness detection device and method for carrier glass, which can synchronously detect the carrier glass produced online to ensure that all places of all carrier glass are detected, and the detection method is novel and the detection efficiency is high.

[0006] The technical effects to be achieved by this application are achieved through the following solutions:

[0007] According to the first aspect of the present application, there is provided a flatness detection device for a carrier glass, comprising a light source and a camera, wherein the light source is arranged above a conveying roller of the carrier glass, and can emit an umbrella-shaped light beam perpendicular to the carrier glass, so that the laser forms a straight light beam on the carrier glass, a translucent measuring plate is provided below the conveying roller directly opposite to the light source, the camera is arranged below the measuring plate and opposite to the light source, the light source and the camera are both driven by a driving mechanism, and the driving mechanism is arranged laterally along the conveying roller; and a processing mechanism is also included, in which a neural network is installed, for detecting defects according to the deformation of the straight light spot on the measuring plate.

[0008] Preferably, an LED matrix is ​​provided in the light source, and the linear light beams emitted by the LED matrix form a rectangular grid.

[0009] Preferably, the measuring plate is provided with grid-shaped scale lines, and the sides of the rectangular grid are arranged parallel to or perpendicular to the scale lines.

[0010] Preferably, the scale lines are raised or recessed lines.

[0011] Preferably, the line width of the linear light beam is consistent with the width of the scale line.

[0012] Preferably, the driving mechanism includes a mounting frame, a guide rail and a driving motor. The mounting frame is fixed to both sides of the conveying roller. The guide rail has two groups and is respectively fixed to the mounting frames on the upper and lower sides of the conveying roller. The light and the camera are respectively slidably connected to the guide rails, and the driving motor drives the light source and the camera to reciprocate.

[0013] Preferably, a driving disk is provided on the driving motor, and the driving disk includes two driving grooves arranged in parallel. Two pull ropes are respectively located in the two driving grooves and drive the light source and the camera respectively.

[0014] According to a second aspect of the present application, a detection method using the above-mentioned flatness detection device for carrier glass is provided, comprising the following steps:

[0015] Step 1: After the carrier glass reaches the light source, the processing mechanism controls the light source to emit a straight light beam to the carrier glass, and the driving mechanism starts at the same time, driving the light source to move at a constant speed;

[0016] Step 2: The camera moves synchronously with the light source, periodically captures the light spot image on the measuring plate, and sends the light spot image to the processing mechanism;

[0017] Step 3: The processing mechanism sends the light spot image to the neural network for identification to determine whether the linear light beam in the light spot image has convexity or concaveness;

[0018] Step 4: The carrier glass with convexities or concavities is judged as unqualified and marked, otherwise it is qualified.

[0019] Preferably, in step 2, the camera shooting interval is no greater than the width of each small grid in the rectangular grid.

[0020] Preferably, when the driving mechanism is started, the conveying roller is in a stationary state. When the driving mechanism reaches both ends and stops, the conveying roller is started to perform longitudinal conveying, and the distance of each longitudinal conveying is not greater than the length of the rectangular grid.

[0021] According to one embodiment of the present application, the beneficial effect of using the flatness detection device for carrier glass of the present application is that it can automatically detect the flatness of the carrier glass that has been produced, and the detection efficiency is higher, so that complete detection can be achieved, and unqualified parts can be marked, which facilitates the recycling of unqualified carrier glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the existing technical solutions, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a schematic diagram of the principle structure of a flatness detection device for a carrier glass in one embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the side structure of a device for detecting the flatness of a middle carrier glass;

[0025] Figure 3 for Figure 1 Schematic diagram of the upward-looking structure of the central light source;

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the light spot on the measuring plate;

[0027] Figure 5 A schematic diagram of a light spot structure of an unqualified glass carrier glass;

[0028] Figure 6 for Figure 1 A schematic diagram of the structure of a driving mechanism in a flatness detection device for a carrier glass;

[0029] Figure 7 for Figure 6 The structural diagram of the middle drive motor;

[0030] Figure 8 4 is a flow chart of a method for detecting the flatness of a carrier glass in one embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] like Figures 1 to 6 As shown, a flatness detection device for a carrier glass in an embodiment of the present application includes a light source 100 and a camera 200. The light source 100 is arranged above the conveying roller 10 of the carrier glass 20, and can emit an umbrella-shaped light beam perpendicular to the carrier glass 20, so that the laser forms a straight light beam on the carrier glass 20. A translucent measuring plate 300 is provided below the conveying roller 10 and opposite to the light source 100. The camera 200 is arranged below the measuring plate 300 and opposite to the light source 100. Both the light source 100 and the camera 200 are driven by a driving mechanism, and the driving mechanism is arranged laterally along the conveying roller 10. It also includes a processing mechanism, in which a neural network is installed, which is used to detect defects according to the deformation of the straight light spot on the measuring plate.

[0033] The light source 100 and the camera 200 are arranged in the gap between the rollers of the conveyor roller 10, which can reduce the installation space and allow the device to be directly installed on the original conveyor roller 10, making it convenient to modify the existing device.

[0034] When a convex or concave defect appears on the surface of the carrier glass 20, a straight light beam is irradiated to the defect, and the light will be offset due to refraction, and finally a non-straight line will appear on the measuring plate 300, that is, a convexity or concave will appear on the straight line light spot. The degree of the convexity or concave of the light spot on the measuring plate 300 is related to the size of the defect and the distance between the measuring plate 300 and the carrier glass 20. By adjusting the distance, smaller defects can be distinguished.

[0035] In this embodiment, the light source 100 is provided with an LED matrix 110, and the linear light beams emitted by the LED matrix form a rectangular grid. Figures 3 to 5 As shown, the light-emitting body is a number of LED lamp beads, each of which can emit a fan-shaped laser surface, thereby forming a straight laser beam on the carrier glass. By arranging the angles of the LED lamp beads, a rectangular network can be formed. The rectangular grid is moved and photographed to perform all-round detection of the area in the rectangular grid.

[0036] In this embodiment, the length of the measuring plate 300 is consistent with the width of the conveyor roller 10, and scale lines are provided on the measuring plate 300. After the light source 100 irradiates the measuring plate 300 through the carrier glass 20, a light spot 101 can be generated on the scale line. The camera 200 captures the shape of the light spot 101 on the measuring plate 300 at the bottom, and it can be known whether there is a defect in the image flatness at that location.

[0037] The scale lines can provide a benchmark for judgment and avoid misjudgment caused by factors such as temperature, humidity, dust on the camera, etc. For example, if there are water drops on the camera, it can cause the same distortion as the scale lines when shooting.

[0038] The measuring board 300 is, for example, frosted glass, a white plastic board, etc. The light irradiated onto the measuring board 300 can be diffusely reflected, making the taken photos clearer and avoiding the problem of being unable to take photos due to misalignment between the camera 200 and the light source 100.

[0039] The measuring plate 300 can also play a protective role, preventing debris, dust, etc. in the production process from falling onto the camera 200 and causing recognition errors.

[0040] In one embodiment of the present application, the scale line is a raised or recessed line. When the light spot is raised or recessed due to a defect, the raised or recessed light spot can be projected onto the scale line. Due to the height difference, the deformed light spot will be further elongated, making it easier to identify the defect, thereby improving the detection accuracy.

[0041] In this embodiment, the driving mechanism can drive the light source 100 and the camera 200 to move horizontally synchronously, and the conveying roller 10 can convey the carrier glass 20 longitudinally to achieve overall scanning of the carrier glass 20 .

[0042] The driving mechanism includes a mounting frame 410, a guide rail 420 and a driving motor 430. The mounting frame 410 is fixed to both sides of the conveying roller 10. There are two groups of guide rails 420 and they are respectively fixed to the mounting frame 410 on the upper and lower sides of the conveying roller 10. The light and camera 200 are respectively slidably connected to the guide rails 420. The driving motor 430 drives the light source 100 and the camera 200 to reciprocate.

[0043] The guide rail 420 is, for example, a polished rod, and the light source 100 and the camera 200 are respectively slidably connected to at least two polished rods through linear bearings to ensure their stability and avoid deviation in the illumination angle. The drive motor 430 adjusts the position of the light source 100 and the camera 200 by pulling a rope or the like.

[0044] The driving motor 430 is a stepping motor or a servo motor, which can convert the rotation angle into the moving distance of the light source 100 or the camera 200, so as to calculate the current detection position of the carrier glass 20, so as to facilitate marking of unqualified parts.

[0045] In order to ensure the synchronous movement of the light source 100 and the camera 200, a driving disk 431 is provided on the driving motor 430, and the driving disk 431 includes two driving slots 432 arranged in parallel. The two pull ropes are respectively located in the two driving slots 432 and respectively drive the light source 100 and the camera 200. The rotation of the driving motor 430 can drive the light source 100 and the camera 200 to move synchronously, ensuring that the light spot 101 is facing when shooting.

[0046] There are two sets of pulley blocks on the upper and lower sides of the mounting frame 410, and the pull rope is wound around the two sets of pulley blocks respectively, completing the arrangement of the drive system.

[0047] like Figure 7 As shown, the detection method using the above-mentioned flatness detection device of the carrier glass includes the following steps:

[0048] Step 1: After the carrier glass reaches the light source, the processing mechanism controls the light source to emit a light beam to the carrier glass, and the driving mechanism starts at the same time, driving the light source to move at a constant speed;

[0049] In this step, after the position sensor is used to sense that the carrier glass has reached the desired position, the driving mechanism synchronously drives the light source and the camera to move. When the current row is detected, the carrier glass is in a suspended state to avoid missed detection.

[0050] Step 2: The camera moves synchronously with the light source, periodically captures the light spot image on the measuring plate, and sends the light spot image to the processing mechanism;

[0051] In this step, the number of times the camera takes pictures is related to the diameter of the light source, and the shooting cycle is related to the moving speed of the light source, that is, the quotient of the light source width and the moving speed is used to obtain the interval time of the camera shooting.

[0052] In order to improve accuracy, the interval distance of the camera shooting is related to the width of the center line of the light source's spot, ensuring that a full-range scan of the row can be completed.

[0053] Step 3: The processing mechanism sends the light spot image to the neural network for identification to determine whether the linear light beam in the light spot image has convexity or concaveness;

[0054] In this step, when a raised or sunken defect appears on the surface of the carrier glass, a straight light beam is irradiated to the defect, and the light will be offset due to refraction, and eventually a non-straight line will appear on the measuring plate, that is, a raised or sunken area will appear on the straight line light spot. By identifying the curved area on the light spot through a neural network, it can be determined whether there is a defect at present.

[0055] Step 4: The carrier glass with convexities or concavities is judged as unqualified and marked, otherwise it is qualified.

[0056] In this step, the unqualified positions are marked, such as coordinate positions, to facilitate subsequent recording and processing of the carrier glass.

[0057] When the driving mechanism is started, the conveying roller is in a stationary state. When the driving mechanism reaches both ends and stops, the conveying roller starts to carry out longitudinal conveying. The distance of each longitudinal conveying is not greater than the length of the rectangular grid.

[0058] According to one embodiment of the present application, the beneficial effect of using the flatness detection device of the carrier glass of the present application is that the flatness of the produced carrier glass can be automatically detected on-line, and the detection efficiency is higher.

[0059] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0062] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0063] For ease of description, spatially relative terms, such as "above", "above", "on the upper surface of", "above", etc., may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0064] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flatness detection device for carrier glass, comprising a light source and a camera, characterized in that: The light source is arranged above the conveying roller of the carrier glass, and can emit an umbrella-shaped light beam perpendicular to the carrier glass, so that the laser forms a straight light beam on the carrier glass. A translucent measuring plate is arranged below the conveying roller and directly opposite to the light source. The camera is arranged below the measuring plate and opposite to the light source. The light source and the camera are both driven by a driving mechanism, and the driving mechanism is arranged laterally along the conveying roller. A processing mechanism is also included, in which a neural network is installed, which is used to detect defects according to the deformation of the straight light spot on the measuring plate.

2. The flatness detection device for carrier glass according to claim 1, characterized in that: The light source is provided with an LED matrix, and the linear light beams emitted by the LED matrix form a rectangular grid.

3. The flatness detection device for carrier glass according to claim 2, characterized in that: The measuring plate is provided with grid-shaped scale lines, and the sides of the rectangular grid are arranged parallel to or perpendicular to the scale lines.

4. The flatness detection device for carrier glass according to claim 3, characterized in that: The scale lines are raised or sunken lines.

5. The flatness detection device for carrier glass according to claim 3 or 4, characterized in that: The line width of the linear light beam is consistent with the width of the scale line.

6. The flatness detection device for carrier glass according to claim 1, characterized in that: The driving mechanism includes a mounting frame, a guide rail and a driving motor. The mounting frame is fixed to both sides of the conveying roller. The guide rail has two groups and is respectively fixed to the mounting frames on the upper and lower sides of the conveying roller. The light and the camera are respectively slidably connected to the guide rails, and the driving motor drives the light source and the camera to reciprocate.

7. The flatness detection device for carrier glass according to claim 6, characterized in that: The driving motor is provided with a driving disk, and the driving disk includes two driving grooves arranged in parallel. Two pull ropes are respectively located in the two driving grooves and drive the light source and the camera respectively.

8. A detection method using the flatness detection device for carrier glass according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: After the carrier glass reaches the light source, the processing mechanism controls the light source to emit a straight light beam to the carrier glass, and the driving mechanism starts at the same time, driving the light source to move at a constant speed; Step 2: The camera moves synchronously with the light source, periodically captures the light spot image on the measuring plate, and sends the light spot image to the processing mechanism; Step 3: The processing mechanism sends the light spot image to the neural network for identification to determine whether the linear light beam in the light spot image has convexity or concaveness; Step 4: The carrier glass with convexities or concavities is judged as unqualified and marked, otherwise it is qualified.

9. The detection method according to claim 8, characterized in that: In step 2, the camera shooting interval is no greater than the width of each small grid in the rectangular grid.

10. The detection method according to claim 8, characterized in that: When the driving mechanism is started, the conveying roller is in a stationary state. When the driving mechanism reaches both ends and stops, the conveying roller starts to carry out longitudinal conveying. The distance of each longitudinal conveying is not greater than the length of the rectangular grid.

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