A glass defect online detection device

Abstract

The present invention discloses an online glass defect detection device, which is used to detect surface defects and edge defects of glass sheets or other sheet products, and includes: a transport mechanism, which is used to drive the product to be detected to move at a certain speed; a surface detection mechanism, which includes a front detection device and a back detection device, which are used to detect the upper surface and the lower surface of the product to be detected respectively; an edge detection mechanism, which includes several sets of edge detection devices installed on the transport mechanism at a certain interval, and the several sets of edge detection devices can achieve coverage detection of all edges of the product to be detected. The present invention can perform real-time online detection and analysis of defects such as the surface and side of glass sheets or other sheet products, with high accuracy, fast detection speed, no need to pause during the detection process, and a high degree of automation. It can not only replace manual detection, but also greatly reduce missed detection and false detection caused by manual visual fatigue.

Description

Technical Field

[0001] The present invention relates to an online glass defect detection device, and further relates to a universal glass defect detection device belonging to the field of machine vision. Background Art

[0002] With the development of economy, cars have entered ordinary families, and the output of automobile glass is also increasing. However, since automobile glass manufacturers have very high requirements for glass online detection, especially glass edge grinding detection, this detection technology has always been blank in China, and high-end detection technology has always been in the hands of foreign manufacturers.

[0003] In addition, the existing glass defect detection equipment also has corresponding problems such as low detection accuracy, high missed detection and false detection rates, the need to pause the testing process, and low production rate.

[0004] Therefore, how to provide an online glass defect detection device that can effectively overcome the above-mentioned defects in the prior art is an important research topic for those skilled in the art at the current stage. Summary of the invention

[0005] The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

[0006] To this end, the purpose of the present invention is to provide an online glass defect detection device for detecting surface defects and edge defects of glass sheets or other sheet products, specifically comprising:

[0007] A transport mechanism, the transport mechanism is used to drive the product to be inspected to move at a certain speed;

[0008] A surface detection mechanism, the surface detection mechanism comprising a front detection device and a back detection device, for respectively detecting the upper surface and the lower surface of the product to be detected;

[0009] An edge detection mechanism, the edge detection mechanism comprising a plurality of sets of edge detection devices installed on the transport mechanism at a certain interval, the plurality of sets of edge detection devices being able to achieve coverage detection of all edges of the product to be detected;

[0010] The waste kicking mechanism includes a conveying roller and a transplanting manipulator to remove defective products.

[0011] In the present invention, the front and back detection order of the surface detection mechanism and the edge detection mechanism can be interchanged, and the surface detection mechanism can be in front and the edge detection mechanism in the back; or the edge detection mechanism can be in front and the surface detection mechanism in the back. Moreover, the surface detection mechanism and the edge detection mechanism can also be used separately, each constituting an independent device to realize the detection of a single function.

[0012] The present invention discloses an online glass defect detection device, which is used to detect surface defects and edge defects of glass sheets or other sheet products, such as solar glass, liquid crystal screens, architectural glass, automobile glass, etc., based on advanced machine vision methods. The present invention can perform real-time online detection and analysis of defects such as edge collapse, fingerprints, scratches, stains, cracks, bubbles, flaws, and poor side grinding on the surface of glass sheets or other sheet products, with high accuracy, fast detection speed, no need to pause during the detection process, and high degree of automation. It can not only replace manual detection, but also greatly reduce missed detection and false detection caused by manual visual fatigue.

[0013] On the basis of the above technical solution, the present invention can also make the following improvements:

[0014] Preferably, a plurality of photoelectric sensors are installed on the transport mechanism to sense the travel position of the products to be inspected and to perform quantity statistics so as to trigger corresponding front detection devices, back detection devices and edge detection devices.

[0015] The above-mentioned photoelectric sensor can also be replaced by a laser beam switch.

[0016] Preferably, the transport mechanism comprises a power roller driven by an external motor and a rubber ring sleeved on the power roller, wherein the rubber ring is used to assist the movement of the product to be inspected.

[0017] Preferably, the front detection device includes a first light source and a first camera located above the product to be inspected, and the light emitted by the first light source contacts the upper surface of the product to be inspected and the light reflected back will be received by the first camera; the back detection device includes a second light source and a second camera located below the product to be inspected, and the light emitted by the second light source contacts the lower surface of the product to be inspected and the light reflected back will be received by the second camera.

[0018] In the present invention, the front detection device and the back detection device have the same structure and optical path and are positioned relative to each other, so as to detect the front defects and back defects of the product respectively, and finally send the detected defects to the corresponding computer for analysis and processing. During this detection process, the product to be detected does not need to stop.

[0019] Preferably, an installation position of the first light source and the first camera above the product to be inspected is opposite to an installation position of the second light source and the second camera below the product to be inspected.

[0020] To avoid mutual interference, the present invention adopts a reverse design, that is, the first light source and the second camera are at the same upper and lower positions, and the first camera and the second light source are at the same upper and lower positions, so that the light source will not interfere with the camera on the opposite side.

[0021] In addition, the first light source and the second light source are preferably high-brightness line-scanning strip light sources or long strip surface light sources, and the length should not be less than the width of the contour of the inspected glass perpendicular to the traveling direction.

[0022] Preferably, the angle range between the extended lines of the light emitting ends of the first light source and the second light source and the product to be inspected is 40°-70°, which is the optimal angle design range. At this angle, the images of the upper and lower surfaces of the product to be inspected can be captured as clear and comprehensive as possible.

[0023] Preferably, the edge detection devices are four or six sets; when there are four sets, the four sets of edge detection devices are grouped in pairs, and the two groups of edge detection devices are respectively located on both sides of the product to be detected perpendicular to its traveling direction and facing the edge of the product to be detected, and the four sets of edge detection devices can achieve coverage detection of all edges of the product to be detected; when there are six sets, the edge detection mechanism adds one set of edge detection device between the two groups of edge detection devices on the basis of the four sets of edge detection devices.

[0024] In other words, the six sets of edge detection devices are formed by adding two sets of edge detection devices to the four sets of edge detection devices on both sides perpendicular to the traveling direction of the glass according to the complexity of the glass contour.

[0025] Preferably, the edge detection device includes a laser power supply, a laser, a beam splitter, a light trap, a first prism, a second prism, a third prism, and a third camera;

[0026] The laser detection beam emitted by the laser is directed toward the edge of the product to be detected, the laser is driven by the laser power supply, and the laser power supply is controlled by a computer and a laser controller connected to the computer;

[0027] The beam splitter is located between the laser and the product to be inspected, and the beam splitting surface of the beam splitter forms an angle of 44°-46° with the laser detection beam emitted by the laser, so that the laser light path returned after the laser is emitted and irradiated on the surface of the glass sheet is slightly offset by a certain angle to avoid interference between the emission and return light paths. The laser detection beam emitted by the laser is transmitted through the beam splitter and is divided into a main beam and a side beam. The light trap is located on one side of the beam splitter and the line connecting it to the beam splitter is perpendicular to the main beam. The side beam will be absorbed by the light trap; the main beam will irradiate the edge of the product to be inspected and reflect. The reflected main beam will then be reflected step by step through the beam splitter, the first prism, the second prism, and the third prism to reach the third camera;

[0028] The first camera, the second camera and the third camera will upload the grayscale information of the captured images to the computer for analysis. The computer is connected to a PLC. The computer connected to the PLC will also adjust the power of the laser through the laser controller based on the grayscale information of the images captured by the camera.

[0029] Particularly, the first camera, the second camera and the third camera may be line scan cameras or area array cameras, preferably line scan cameras.

[0030] The several sets of edge detection devices in the present invention are all designed with the above-mentioned structure. The laser detection beams emitted by several lasers are respectively aimed at different edges of the product to be detected. During the movement of the product to be detected, the multiple sets of edge detection devices can realize the detection of all edges of the detection product without the problem of missed detection and the need for the product to be detected to pause during the detection process.

[0031] Preferably, the first prism and the second prism are fixed on a fixing frame, the third prism and the third camera are fixed on a fixing plate, the fixing frame is fixed on a guide rail, the guide rail is driven by a stepper motor or a servo motor to move up and down to change the length of the optical path in the vertical direction, and the stepper motor or the servo motor is controlled by the computer.

[0032] During the movement of the product to be inspected, the length of the optical path can be changed by a stepper motor or a servo motor to ensure that the total distance between the third camera and the edge of the product to be inspected is substantially constant within the acceptable depth of field. For example, when a concave section appears on the edge of the product to be inspected, the motor controls the first prism and the second prism to move downward to bring them closer to the product to be inspected; when a convex section appears on the edge of the product to be inspected, the motor controls the first prism and the second prism to move upward to move them away from the product to be inspected.

[0033] Preferably, the contour image of the product to be inspected must be input into the software program of the computer in advance, so that the computer can continuously transmit signals to the stepper motor or servo motor to control the motor to match the contour.

[0034] Preferably, the design wavelength of the beam splitter's spectral film should be consistent with the laser center wavelength of the laser, and the diameter of the laser spot emitted by the laser should not be less than the thickness of the product to be inspected.

[0035] Preferably, the first prism, the second prism and the third prism are total reflection right-angle prisms, which can be made of quartz or other materials with high light transmittance, and the side lengths of the laser incident surface and the laser output surface should be larger than the laser spot diameter.

[0036] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses an online glass defect detection device, which has at least the following beneficial effects:

[0037] The present invention can perform real-time online detection and analysis of defects such as edge chipping, fingerprints, scratches, stains, cracks, bubbles, blemishes and poor side grinding on the surface of glass or other sheet products, with high accuracy and fast detection speed. There is no need to pause during the test process, and the production rate will not be affected.

[0038] The present invention can automatically adjust the laser illumination intensity, thereby avoiding illumination errors that occur during manual adjustment.

[0039] The present invention can automatically adjust the working distance according to the contour of the product to be detected, and sheet products such as glass of any shape can be accurately detected.

[0040] The present invention can automatically calibrate the initial positions of the first and second prisms according to the contours of different products to be inspected, and import tracking curves of the contours of different products to be inspected, thereby ensuring that in the inspection of products with different contours, the total distance between the third camera and the edge of the product to be inspected is basically constant within an acceptable range of the depth of field, thereby achieving rapid switching of different glass specifications.

[0041] The program algorithm of the present invention is stable, and the defect size identification standard is adjustable through software configuration, which can not only replace manual inspection, but also avoid false inspection and missed inspection caused by manual visual fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0043] Figure 1 It is a principle diagram of an online glass defect detection device provided by the present invention;

[0044] Figure 2 The present invention provides a structure of a glass defect online detection device Figure 1 ;

[0045] Figure 3 The present invention provides a structure of a glass defect online detection device Figure 2 ;

[0046] Figure 4 This is an overall structural diagram of an online glass defect detection device provided by the present invention after installation;

[0047] Figure 5 is a schematic diagram of the specific structure of the edge detection device provided by the present invention;

[0048] Figure 6 It is a schematic diagram of the specific structure of the waste kicking mechanism provided by the present invention;

[0049] Among them, in the figure,

[0050] 1-first camera, 2-first light source, 3-second light source, 4-second camera; 5-laser, 6-laser power supply, 7-light trap, 8-beam splitter, 9-first prism, 10-second prism, 11-third camera, 12-fixed frame, 13-guide rail, 14-stepping motor or servo motor, 15-computer, 16-glass sheet, 17-power roller, 18-rubber ring, 19-front detection device, 20-edge detection device, 21-photoelectric sensor 1, 22-photoelectric sensor 2, 23-third prism, 24-transplanting robot, 25-fixed plate. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] According to the following Figure 1-6An online glass defect detection device according to an embodiment of the present invention is described in detail. Example

[0055] like Figure 1-6 As shown, an embodiment of the present invention discloses an online glass defect detection device, which is used to detect surface defects and edge defects of a glass sheet 16 or other sheet products, such as automobile glass, based on an advanced machine vision method.

[0056] The specific technical solution of this embodiment is described in detail below by taking the detection of the glass sheet 16 as an example.

[0057] The glass defect online detection device of this embodiment includes: a transport mechanism, a surface detection mechanism, an edge detection mechanism and a kicking mechanism. The transport mechanism is used to drive the glass sheet 16 to move at a certain speed. The surface detection mechanism includes a front detection device 19 and a back detection device, which are used to detect the upper surface and the lower surface of the glass sheet 16 respectively. The edge detection mechanism includes four or six sets of edge detection devices 20 installed on the transport mechanism at a certain interval. When there are four sets, such as Figure 2 As shown, four sets of edge detection devices 20 are grouped in pairs, and the two sets of edge detection devices are respectively located on both sides of the glass sheet 16 perpendicular to its traveling direction and facing the edge of the glass sheet 16. The four sets of edge detection devices 20 can achieve coverage detection of all edges of the glass sheet 16. When there are six sets, as shown in FIG. Figure 3 As shown, the edge detection mechanism is provided with an additional set of edge detection devices 20 between two sets of edge detection devices on the basis of the above four sets of edge detection devices 20, so as to cope with glass sheets 16 with complex contours. The following embodiment is specifically described according to the specification of four sets of edge detection devices 20. The scrap removal mechanism includes a conveying roller and a transfer robot 24, and the transfer robot 24 includes a pneumatic lifting device and a lateral conveying device to realize the removal of defective products.

[0058] Specifically,

[0059] like Figure 1 As shown, two photoelectric sensors are installed on the transport mechanism: photoelectric sensor 1 21 and photoelectric sensor 2 22. When the glass sheet 16 moves to the position of photoelectric sensor 1 21, the front detection device 19 and the back detection device are triggered to start; when the glass sheet 16 moves to the position of photoelectric sensor 22, the edge detection device 20 is triggered to start.

[0060] The two photoelectric sensors mentioned above can be further used to count the number of glass sheets 16, and these photoelectric sensors can also be replaced by laser beam switches.

[0061] The transport mechanism includes a power roller 17 driven by an external motor and a rubber ring 18 mounted on the power roller 17. The rubber ring 18 is used to assist the glass sheet 16 to move at a certain speed.

[0062] The front detection device 19 includes a first light source 2 and a first camera 1 located above the glass sheet 16. The light emitted by the first light source 2 contacts the upper surface of the glass sheet 16 and the light reflected back will be received by the first camera 1. The back detection device includes a second light source 3 and a second camera 4 located below the glass sheet 16. The light emitted by the second light source 3 contacts the lower surface of the glass sheet 16 and the light reflected back will be received by the second camera 4. It should be further emphasized here that the number of cameras in the front detection device 19 is not limited to two. According to the width of the glass sheet 16, one light source may require one, two or even more cameras to shoot to ensure that the field of view is fully covered.

[0063] In this embodiment, the installation position of the first light source 2 and the first camera 1 above the glass sheet 16 is opposite to the installation position of the second light source 3 and the second camera 4 below the glass sheet 16, so that the light source will not interfere with the camera on the opposite side.

[0064] The angle between the extended lines of the light emitting ends of the first light source 2 and the second light source 3 and the glass sheet 16 is preferably in the range of 40° to 70°.

[0065] Furthermore, the first light source 2 and the second light source 3 are preferably high-brightness line-scanning strip light sources or long strip-shaped surface light sources.

[0066] like Figure 1 , 2 As shown, four sets of edge detection devices 20 are distributed around the edge of the glass sheet 16. The specific structure of any one set of edge detection devices 20 is now described:

[0067] like Figure 5 As shown, the edge detection device 20 includes a laser power supply 6, a laser 5, a beam splitter 8, a light trap 7, a first prism 9, a second prism 10, a third camera 11, a fixing frame 12, a guide rail 13, a stepping motor or a servo motor 14, a third prism 23, and a fixing plate 25;

[0068] The laser 5 is directed toward the edge of the glass sheet 16 by a laser detection beam emitted by a laser emitter, and the laser 5 is driven by a laser power supply 6, which is controlled by a computer 15 and a laser controller connected to the computer 15;

[0069] The beam splitter 8 is located between the laser 5 and the glass sheet 16, and the beam splitting surface of the beam splitter 8 forms an angle of 44°-46° with the laser detection beam emitted by the laser 5, preferably an angle of 45°. The laser detection beam emitted by the laser 5 is transmitted through the beam splitter 8 and is divided into a main beam and a side beam. The light trap 7 is located on one side of the beam splitter 8, and the line connecting it and the beam splitter 8 is perpendicular to the main beam. The side beam will be absorbed by the light trap 7; the main beam will irradiate the edge of the glass sheet 16 and reflect. The reflected main beam will then be reflected step by step by the beam splitter 8, the first prism 9, the second prism 10, and the third prism 23 to reach the third camera 11;

[0070] The first camera 1, the second camera 4 and the third camera 11 will upload the grayscale information of the captured images to the computer 15 for analysis. The computer 15 is connected to a PLC. The computer 15 connected to the PLC will also adjust the power of the laser 5 through the laser controller based on the grayscale information of the images captured by the camera.

[0071] The above-mentioned computer 15 and PLC can be implemented in one or two entities. The computer 15 operates the motor through the PLC or motion control card. For example, the PLC of Beckhoff of Germany implements the function of softPLC in one computer 15. A motion control card can also be inserted into the computer 15 to implement some functions of the PLC. However, in most manufacturers, the computer 15 and PLC are separate devices.

[0072] The present invention can accurately detect glass sheets 16 of any shape. For glass sheets 16 of irregular shapes, especially in areas where the curvature of the edge of the glass sheet 16 changes dramatically, the computer 15 connected to the PLC will control the laser controller according to the average gray value of the region of interest (ROI) to automatically increase or decrease the intensity by a fixed percentage to ensure that the average gray value of the entire edge is balanced, so that defects can be clearly photographed.

[0073] The first prism 9 and the second prism 10 are fixed on the fixing frame 12, the third prism 23 and the third camera 11 are fixed on the fixing plate 25, the fixing frame 12 is fixed on the guide rail 13, and the guide rail 13 is driven by a stepping motor or a servo motor 14 to move up and down to change the length of the optical path in the vertical direction to ensure that when the glass sheet 16 is moving, the total distance between the third camera 11 and the edge of the glass sheet 16 is basically constant within the range allowed by the depth of field.

[0074] The stepper motor or servo motor 14 is controlled by a computer 15. In addition, other motors in the device may also be controlled by a computer 15.

[0075] The outline of the glass sheet 16 must be input into the software program of the computer 15 in advance to ensure that the computer 15 continuously transmits signals to the stepper motor or servo motor 14 to achieve control of the motor.

[0076] In order to further optimize the above technical solution, the design wavelength of the beam splitter 8 should be consistent with the laser center wavelength of the laser 5, and the diameter of the laser spot emitted by the laser 5 should not be less than the thickness of the glass sheet 16 to be inspected.

[0077] In order to further optimize the above technical solution, the first prism 9, the second prism 10 and the third prism 23 are total reflection right-angle prisms, which can be quartz or other materials with high light transmittance, and the side lengths of their laser incident and exit surfaces should be greater than the laser spot diameter.

[0078] The specific working process of the glass defect online detection device of the present invention is as follows:

[0079] The glass sheet 16 travels on the rubber ring 18 on the power roller 17 at a certain speed;

[0080] When the glass sheet 16 moves to the position of the photoelectric sensor 21, the first light source 2 and the second light source 3 are triggered to illuminate, and the first camera 1 and the second camera 4 are triggered to take pictures at the same time; specifically, the light emitted by the first light source 2 illuminates the upper surface of the glass sheet 16, and is reflected by the upper surface of the glass sheet 16 to the first camera 1; the light emitted by the second light source 3 illuminates the lower surface of the glass sheet 16, and is reflected by the lower surface of the glass sheet 16 to the second camera 4;

[0081] When the glass sheet 16 continues to move to the position of the second photoelectric sensor 22, the laser 5 is triggered to emit a laser detection beam and the third camera 11 takes a photo;

[0082] When the glass sheet 16 continues to move to the position of the second photoelectric sensor 22, it will also trigger the stepper motor or servo motor 14 to drive the prism to move up and down. Specifically, the stepper motor or servo motor 14 drives the guide rail 13 to drive the fixing frame 12 to move up and down to the set position, and the first prism 9 and the second prism 10 move with the fixing frame 12.

[0083] The laser detection beam emitted by the laser 5 is split into two beams by the beam splitter 8. The secondary beam reaches the light trap 7 and is reflected and absorbed. The primary beam reaches the edge of the glass sheet 16 through the beam splitter 8. The light irradiated to the edge of the glass sheet 16 will be diffusely reflected, and a part of the diffusely reflected light will return to the beam splitter 8, and then pass through the first prism 9, the second prism 10 and the third prism 23 to clearly reflect the edge image of the glass sheet 16 to the third camera 11.

[0084] The first camera 1, the second camera 4 and the third camera 11 will upload the imaging results to the computer 15 respectively, and the software program on the computer 15 will automatically adjust the power of the laser 5 by the laser power supply according to the image grayscale information uploaded by the camera;

[0085] The computer 15 can analyze the type, size and location of the defect after program processing, and finally send it to the PLC to discard it;

[0086] After receiving the PLC kicking signal, the kicking mechanism transfers the defective products to the defective product conveying line through the transfer robot 24, realizing non-stop kicking.

[0087] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0088] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A glass defect online detection device, used to detect surface defects and edge defects of glass sheets or other sheet products, characterized in that: include: A transport mechanism, the transport mechanism is used to drive the product to be inspected to move at a certain speed; A surface detection mechanism, the surface detection mechanism comprising a front detection device (19) and a back detection device, for respectively detecting the upper surface and the lower surface of the product to be detected; An edge detection mechanism, the edge detection mechanism comprising a plurality of sets of edge detection devices (20) installed on the transport mechanism at a certain interval, the plurality of sets of edge detection devices (20) being capable of achieving coverage detection of all edges of a product to be detected; A waste-kicking mechanism, the waste-kicking mechanism comprising a conveying roller and a transplanting manipulator (24) for removing defective products; The front detection device (19) comprises a first light source (2) and a first camera (1) located above the product to be detected, and the light emitted by the first light source (2) contacts the upper surface of the product to be detected and the light reflected back is received by the first camera (1); the back detection device comprises a second light source (3) and a second camera (4) located below the product to be detected, and the light emitted by the second light source (3) contacts the lower surface of the product to be detected and the light reflected back is received by the second camera (4); the installation position of the first light source (2) and the first camera (1) above the product to be detected is opposite to the installation position of the second light source (3) and the second camera (4) below the product to be detected; The edge detection device (20) comprises a laser power supply (6), a laser (5), a beam splitter (8), a light trap (7), a first prism (9), a second prism (10), a third prism (23), and a third camera (11); The laser detection beam emitted by the laser (5) is directed toward the edge of the product to be detected, the laser (5) is driven by the laser power supply (6), and the laser power supply (6) is controlled by a computer (15) and a laser controller connected to the computer (15); The beam splitter (8) is located between the laser (5) and the product to be inspected, and the beam splitting surface of the beam splitter (8) forms an angle of 44°-46° with the laser detection beam emitted by the laser (5). The laser detection beam emitted by the laser (5) is transmitted through the beam splitter (8) and is split into a main beam and a side beam. The light trap (7) is located on one side of the beam splitter (8) and the line connecting it and the beam splitter (8) is perpendicular to the main beam. The side beam will be absorbed by the light trap (7); the main beam will irradiate the edge of the product to be inspected and be reflected. The reflected main beam will then be reflected step by step through the beam splitter (8), the first prism (9), the second prism (10), and the third prism (23) before reaching the third camera (11); The first camera (1), the second camera (4) and the third camera (11) upload the grayscale information of the captured images to the computer (15) for analysis. The computer (15) is connected to a PLC. The computer (15) connected to the PLC also adjusts the power of the laser (5) through the laser controller based on the grayscale information of the images captured by the cameras.

2. The glass defect online detection device according to claim 1, characterized in that: The transport mechanism is equipped with a plurality of photoelectric sensors for sensing the travel position of the products to be inspected and performing quantity counting, so as to trigger corresponding front inspection devices (19), back inspection devices and edge inspection devices (20).

3. The glass defect online detection device according to claim 1, characterized in that: The transport mechanism comprises a power roller (17) driven by an external motor and a rubber ring (18) sleeved on the power roller (17), wherein the rubber ring (18) is used to assist the movement of the product to be inspected.

4. The glass defect online detection device according to claim 1, characterized in that: The angle between the extended lines of the light emitting ends of the first light source (2) and the second light source (3) and the product to be inspected is in the range of 40°-70°.

5. The glass defect online detection device according to claim 1, characterized in that: The edge detection devices (20) are four sets or six sets. When there are four sets, the four sets of edge detection devices (20) are grouped in pairs, and the two sets of edge detection devices are respectively located on both sides of the product to be detected perpendicular to its moving direction and facing the edge of the product to be detected. The four sets of edge detection devices (20) can achieve coverage detection of all edges of the product to be detected. When there are six sets, the edge detection mechanism is based on the four sets of edge detection devices (20) and each has an additional set of edge detection devices (20) between the two sets of edge detection devices.

6. The glass defect online detection device according to claim 1, characterized in that: The first prism (9) and the second prism (10) are fixed on a fixing frame (12), the third prism (23) and the third camera (11) are fixed on a fixing plate (25), the fixing frame (12) is fixed on a guide rail (13), the guide rail (13) is driven by a stepping motor or a servo motor (14) to move up and down to change the length of the optical path in the vertical direction, and the stepping motor or the servo motor (14) is controlled by the computer (15).

7. The glass defect online detection device according to claim 6, characterized in that: The contour image of the product to be inspected must be input into the software program of the computer (15) in advance.

Images