Detection system

Abstract

The application provides a detection system, comprising: a first detection module, comprising a first shooting device and a first light source, the first shooting device is used for shooting the image of a product to be detected, the first light source is a surface light source, and is used for emitting light to irradiate the product to be detected when the first shooting device shoots the image of the product to be detected; a sensing module, used for generating a sensing signal when the product to be detected is sensed; and a control module, connected with the first shooting device, the first light source and the sensing module respectively, used for controlling the first light source to emit light and controlling the first shooting device to shoot an image when the sensing signal is received, and used for analyzing the image to determine whether the product to be detected is qualified.

Description

Technical Field

[0001] This application relates to the field of product testing technology, and in particular to a testing system. Background Technology

[0002] Producing a complete product often involves multiple production processes. After each process, quality inspection is typically performed to assess the product's quality. One inspection device for product quality checks acquires information such as shape and structure by capturing images of the product, thus evaluating its suitability. This device illuminates the product with a ring light source and captures an image. Because the ring light source has a small illumination range, different areas of the product experience varying degrees of brightness. Changing the shooting angle alters the brightness distribution in the captured image. Since image analysis focuses on capturing the brightest parts, changes in the shooting angle cause a shift in the captured highlights. Therefore, this ring light source-based inspection device requires a precise shooting angle. Only images captured at specific angles can be used to obtain information about the product's shape and structure; any deviation in the shooting angle renders the image unusable, hindering the effective acquisition of product information. Summary of the Invention

[0003] This application provides a detection system, including:

[0004] The first detection module includes a first imaging device and a first light source. The first imaging device is used to capture an image of the product under test, and the first light source is a surface light source used to illuminate the product under test when the first imaging device captures an image of the product under test.

[0005] A sensing module is used to generate a sensing signal when the product under test is sensed; and

[0006] The control module is connected to the first imaging device, the first light source, and the sensing module respectively. When the sensing signal is received, the control module controls the first light source to emit light and controls the first imaging device to capture an image. The control module is also used to analyze the image to determine whether the product under test is qualified.

[0007] The aforementioned detection system includes a first detection module, which includes a first imaging device and a first light source. The first light source is a surface light source. During the imaging process of the first imaging device, since the first light source is a surface light source, the light emitted by it can maintain uniform brightness in a large area where the product under test is located. Even if the imaging angle is slightly off (i.e., the first imaging device does not directly face the product under test), a clear image of the product under test can still be captured. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the module structure of the detection system in the embodiments of this application.

[0009] Figure 2 This is a schematic diagram of the detection system in an embodiment of this application.

[0010] Figure 3 for Figure 2 A three-dimensional structural diagram of the first detection module.

[0011] Figure 4 for Figure 3 A disassembly diagram of the first light source in the middle.

[0012] Figure 5 for Figure 4 A schematic diagram of the structure of the central light-emitting plate.

[0013] Figure 6 This is another schematic diagram of the detection system in an embodiment of this application.

[0014] Figure 7 This is another schematic diagram of the detection system in an embodiment of this application.

[0015] Figure 8 This is another schematic diagram of the detection system in an embodiment of this application.

[0016] Figure 9 An image of the product under test taken by a camera in a ratio when the camera is directly facing the product under test.

[0017] Figure 10 These are images of the product under test taken by a pair of proportionally scaled imaging devices when the shooting angle is shifted.

[0018] Figure 11 This is an image of the product under test taken by the first imaging device when it is facing the product under test in this embodiment.

[0019] Figure 12 This is an image of the product under test captured by the first shooting device in this embodiment when the shooting angle is shifted.

[0020] Explanation of main component symbols

[0021] Detection System 1

[0022] First detection module 10

[0023] First imaging device 11

[0024] First Light Source 12

[0025] Light-emitting panel 121

[0026] Substrate 1211

[0027] Light-emitting element 1212

[0028] Reflector 122

[0029] Reflective section 1221

[0030] Reflecting surface S

[0031] Connecting part 1222

[0032] Through holes 1223, 221

[0033] Hollow Space 1224

[0034] Light blocking plate 13

[0035] Second detection module 20

[0036] Second shooting device 21

[0037] Second light source 22

[0038] Sensing module 30

[0039] First sensor 31

[0040] Second sensor 32

[0041] Control Module 40

[0042] Main support 50

[0043] Conveying device 2

[0044] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0045] The testing system provided in this application is used to detect whether a product under test is qualified. In this embodiment, the product under test is a plastic bottle with a label, and the testing system is used to detect whether the bottle opening and label of the plastic bottle meet the requirements. In this embodiment, the testing system evaluates whether the bottle opening and label meet the requirements by taking images of the bottle opening and label of the plastic bottle respectively.

[0046] For mass production, production lines typically include conveyor systems (e.g., conveyor belts) that sequentially transport multiple products to be tested from a first processing station to a second processing station. In this embodiment, the testing system is fixed to the side of the conveyor system when applied to the production line. That is, during production line operation, the conveyor system continuously transports the products to be tested, but the testing system remains in a fixed position, sequentially testing the products passing through its location.

[0047] Please see Figure 1 In this embodiment, the detection system 1 includes a first detection module 10, a second detection module 20, a sensing module 30, and a control module 40, wherein the control module 40 is connected to and communicates with the first detection module 10, the second detection module 20, and the sensing module 30, respectively.

[0048] Please see Figure 2 In this embodiment, the detection system 1 further includes a main support 50. The main support 50 is made of rigid electrical insulating material and is mainly used to support the first detection module 10, the second detection module 20 and the sensing module 30, and to fix and maintain the relative positions between the first detection module 10, the second detection module 20 and the sensing module 30.

[0049] Please see Figure 3 In this embodiment, the first detection module 10 includes a first imaging device 11 and a first light source 12. In this embodiment, the first imaging device 11 is an industrial camera used to capture images of the part of the product to be tested (the bottle opening in this embodiment). The first light source 12 emits light when the first imaging device 11 is capturing images, thereby enhancing and uniformizing the brightness of the shooting environment. In this embodiment, when the bottle, as the product to be tested, is placed on the conveyor 2, its bottom directly contacts the conveyor 2. As the bottle passes the first imaging device 11, its opening moves away from the conveyor 2 and faces the first imaging device 11, facilitating the first imaging device 11 to capture images.

[0050] Please see Figure 4 In this embodiment, the first light source 12 includes two light-emitting plates 121. Please refer to... Figure 5 Each light-emitting plate 121 includes a substrate 1211 and multiple light-emitting elements (e.g., light-emitting diodes) 1212 located on the same surface of the substrate 1211. The multiple light-emitting elements 1212 are arranged in an array at intervals. Each light-emitting element 1212 emits light in the same direction, and the light emitted by each light-emitting element 1212 is the same in brightness, so that each light-emitting plate 121 emits light with uniform brightness as a light source.

[0051] The first light source 12 also includes a reflector 122. The reflector 122 includes two reflective portions 1221 and a connecting portion 1222 connecting the two reflective portions 1221. The two reflective portions 1221 and the connecting portion 1222 are integrally formed. Each reflective portion 1221 has a reflecting surface S, which is used to reflect received light. In some embodiments, the reflecting surface S of each reflective portion 1221 is also used to scatter received light.

[0052] In this embodiment, each light-emitting plate 121 and each reflective part 1221 is a generally rectangular sheet structure. The connecting part 1222 is generally a sheet structure with a through hole 1223, and is connected to one side of each of the two reflective parts 1221. The two light-emitting plates 121 are arranged parallel to each other at intervals, and the surfaces of the two light-emitting plates 121 used for emitting light are arranged opposite each other. The two reflective parts 1221 are arranged parallel to each other at intervals, and the reflective surfaces S of the two reflective parts 1221 are arranged opposite each other. The two opposite sides of each light-emitting plate 121 are respectively connected to the two reflective parts 1221, and the two opposite sides of each reflective part 1221 are respectively connected to the two light-emitting plates 121. That is, the two light-emitting plates 121 and the two reflective parts 1221 together form a cylindrical structure with a hollow space 1224.

[0053] Thus, when the two light-emitting panels 121 emit light, the light emitted by the light-emitting panels 121 is reflected multiple times by the two reflective parts 1221, forming a uniformly bright light within the hollow space 1224 to illuminate the product under test. Furthermore, in this embodiment, both light-emitting panels 121 are surface light sources, which can create a uniformly bright shooting environment within a relatively large space, thus improving the shooting quality.

[0054] In this embodiment, the reflective surface S of each reflective part 1221 is perpendicular to the plane containing the extending direction of the conveying device 2. The first imaging device 11 is located on one side of the connecting part 1222 of the first light source 12 and is positioned directly opposite the through hole 1223 of the connecting part 1222. That is, the orthogonal projection of the first imaging device 11 onto the first light source 12 is located within the through hole 1223. Thus, the first imaging device 11 can capture an image of the product under test through the through hole 1223.

[0055] In this embodiment, the direction of movement of the product under test on the conveying device 2 is as follows: Figure 2 or Figure 8 The direction indicated by the dashed arrows indicates that the movement direction of the product under test is parallel to the two light-emitting plates 121 and perpendicular to the two reflective parts 1221. The product under test has a certain height. To facilitate its passage, the length of the side connecting the two reflective parts 1221 to the light-emitting plates 121 is less than the length of the side connecting the light-emitting plates 121 to the reflective parts 1221. That is, the two reflective parts 1221 are further away from the conveying device 2 than the two light-emitting plates 121. When the product under test is directly below the first imaging device 11, the light emitted by the first light source 12 evenly illuminates the product, and the first imaging device 11 captures an image of the bottle opening, obtaining a clearer outline of the bottle opening.

[0056] In this embodiment, the first detection module 10 further includes two light-blocking plates 13. The two light-blocking plates 13 are thin sheets formed of light-shielding material. The two light-blocking plates 13 are arranged parallel to each other and fixedly mounted on both sides of the conveying device 2. When the first light source 12 emits light, the two light-blocking plates 13 are used to block external light, preventing the product under test from being illuminated by external light. That is, in this embodiment, the two light-blocking plates 13 ensure that the area and brightness of the product under test are determined as much as possible by the first light source 12, without interference from external light. When the product under test is conveyed to the first imaging device 11, the product under test is located between the two light-blocking plates 13. The area between the two light-blocking plates 13 isolates external light, increasing the contrast between the bottle opening and other locations of the product under test, which is beneficial for obtaining a clear outline of the bottle opening. The aforementioned external light includes, for example, light emitted from other processing stations on the production line, ambient light, or light from the second detection module 20 (when the first detection module 10 and the second detection module 20 are close together).

[0057] In other embodiments, the first light source 12 includes four light-emitting plates but not a reflector; that is, the four light-emitting plates are connected in sequence to form a cylindrical structure with a hollow space. In this embodiment, the cylindrical structure can be referred to as... Figure 2 In this embodiment, since all four sides are light-emitting panels, there is no need to obtain uniformly bright light through multiple reflections, which is relatively... Figure 2 The illustrated embodiment is beneficial for improving light uniformity. However, Figure 2 The first light source 12 shown includes fewer light-emitting panels, which helps to control costs.

[0058] The second detection module 20 is used to capture images of the label on the product to be tested. Please refer to [link / reference needed]. Figure 6 In this embodiment, the second detection module 20 includes a second imaging device 21 and a second light source 22. In this embodiment, the second imaging device 21 is an industrial camera used to capture images of the label of the product to be tested. The product to be tested also has a bottle body connecting the bottle mouth and the bottle bottom, and the label is attached to the outer surface of the bottle body. When the product to be tested is placed on the conveying device 2, the label faces the second imaging device 21.

[0059] The second light source 22 is used to emit light during the second shooting device 21 to enhance the brightness of the shooting environment of the second shooting device 21. The second light source 22 includes multiple light-emitting elements (not shown, such as light-emitting diodes), which are arranged in an array at intervals. Each light-emitting element emits light in the same direction, and the light emitted by each light-emitting element has the same brightness, so that the second light source 22 emits light with uniform brightness across the entire surface as a light source.

[0060] In this embodiment, the second light source 22 is generally flat and has a through hole 221. The second imaging device 21 is located on the side of the second light source 22 that emits light, and is used to capture an image of the product under test through the through hole 221.

[0061] In this embodiment, the second imaging device 21 and the first imaging device 11 are sequentially arranged along the extension direction of the conveying device 2 (i.e., the displacement direction of the product to be tested being conveyed), thereby sequentially acquiring images of the label and bottle opening of the product to be tested. That is, during the conveying process, the product to be tested first passes through the second imaging device 21, where the label image is acquired, and then passes through the first imaging device 11, where the bottle opening image is captured. In other embodiments, the positional order of the first imaging device 11 and the second imaging device 21 may be different.

[0062] Please see Figure 7 Since the product under test may have multiple labels affixed, such as a front label and a back label, in this embodiment, the detection system 1 includes two second detection modules 20, which are symmetrically arranged on both sides of the conveying device 2 to acquire images of different labels on the product under test. In other embodiments, the detection system 1 may include only one second detection module 20.

[0063] Please see Figure 8 In this embodiment, the sensing module 30 includes a first sensor 31 and a second sensor 32. The first sensor 31 and the second sensor 32 can be infrared sensors, used to sense whether a product to be tested has passed by their location. The first sensor 31 and the second sensor 32 emit infrared light. When a product to be tested passes by, the infrared light shines on the product and is reflected. When the first sensor 31 and the second sensor 32 receive the reflected infrared light, they generate a sensing signal.

[0064] In this embodiment, the second detection module 20, the first sensor 31, the first detection module 10, and the second sensor 32 are arranged sequentially along the extension direction of the conveying device 2. That is, in this embodiment, the product to be tested passes through the second detection module 20 first, then the first sensor 31, then the first detection module 10, and finally the second sensor 32 during the conveying process.

[0065] The control module 40 is a computer that can transmit data or signals to the first detection module 10, the second detection module 20, the first sensor 31, and the second sensor 32 via wired or wireless means. In this embodiment, the control module 40 is connected to the first detection module 10 and the second detection module 20 via a wired connection. The control module 40 is used to control the first imaging device 11 and the second imaging device 21 to take pictures, to control the first light source 12 and the second light source 22 to emit light and to control the brightness of the light, to receive the sensing signals from the first sensor 31 and the second sensor 32, and to analyze the captured images to obtain information about the product under test.

[0066] The following combination Figure 8 The working process of the detection system 1 in this embodiment will be described.

[0067] During the process of conveying the product under test by the conveying device 2, the product under test first arrives at the second detection module 20. When the product under test just arrives at the second detection module 20, the detection system 1 does not operate. The product under test continues to move, and when it reaches the first sensor 31, the first sensor 31 generates a sensing signal. Upon receiving this sensing signal, the control module 40 determines that the product under test is facing the second detection module 20, and controls the second light source 22 to emit light and controls the second imaging device 21 to capture an image. The image captured at this time is the image of the label.

[0068] The product under test has a certain volume, so a certain amount of time is required from the time the product arrives at the first sensor 31 until it completely leaves the first sensor 31. That is, from the moment the product arrives at the first sensor 31, the first sensor 31 continuously generates a sensing signal for a period of time, and the control module 40 continuously receives the sensing signal. When the product completely leaves the first sensor 31, the first sensor 31 stops generating a sensing signal, and the control module 40 switches from receiving a sensing signal to not receiving a sensing signal. In other words, from the moment the product arrives at the first sensor 31, the first sensor 31 generates a trigger signal until the product completely leaves the first sensor 31, at which point the trigger signal stops. The control module 40 can determine from the above state switching that the product has reached the location of the first detection module 10, therefore the control module 40 controls the first light source 12 to emit light and controls the first imaging device 11 to capture an image. The image captured at this time is an image of the bottle opening.

[0069] The first and second shooting devices 11 and 21 are also used to transmit the captured images back to the control module 40. The control module 40 receives the image of the label captured by the second shooting device 21, determines the language (e.g., Chinese, English) of the text on the label based on its outline, and thus determines whether the label has been misplaced. The control module 40 also receives the image of the bottle opening captured by the first shooting device 11, captures the outline of the bottle opening, and determines whether the shape of the bottle opening is a preset shape (e.g., circular), whether there is any uncut material at the bottle opening, and whether the bottle opening is blocked.

[0070] When the control module 40 determines that the label is correctly attached, the bottle mouth shape is correct, there is no residual material at the bottle mouth, and the bottle mouth is not blocked, the product under test is deemed qualified; otherwise, the product under test is deemed unqualified.

[0071] During the analysis of the above image by the control module 40, the product under test continues to move. The control module 40 can obtain a judgment result before the product under test reaches the second sensor 32. When the product under test reaches the second sensor 32, the second sensor 32 can generate a sensing signal. The control module 40 is used to receive the sensing signal, and can determine from the sensing signal that the product under test has left the first detection module 10.

[0072] If the control module 40 determines that the product under test is qualified, it will not operate on the product under test upon receiving the sensing signal from the second sensor 32, and the product under test can continue to be conveyed to the next processing node by the conveyor 2. If the control module 40 determines that the product under test is unqualified, it will remove the corresponding structure from the conveyor 2 on the production line upon receiving the sensing signal from the second sensor 32 to prevent the unqualified product under test from being conveyed to the next processing node. For example, if the production line is equipped with an air blowing structure (not shown), the control module 40 can be electrically connected to the air blowing structure to control the air blowing structure to blow the product under test out of the conveyor 2.

[0073] Figure 9 These are images of the bottle opening captured by a camera when the imaging device is positioned directly over the product being tested, representing a pair of images. Figure 10 The image of the bottle opening is captured by the imaging device when the shooting angle is shifted. When the control module receives the image returned by the imaging device, it captures the highlighted areas in the image and uses them as the outline of the bottle opening. Because this comparative example uses a ring-shaped light source, its illumination range is small. When the shooting angle shifts, the position on the product under test that is illuminated changes, causing the highlighted area in the image to shift from the position of the bottle opening. That is, when the shooting angle shifts, the highlighted area in the captured image no longer completely corresponds to the position of the bottle opening; part of the bottle body is also highlighted. In this case, the control module capturing the highlighted areas in the image as the outline of the bottle opening can lead to misjudgment of whether the product under test is qualified. Furthermore, due to... Figure 10As can be seen, the inside of the product under test (i.e., the inside of the bottle) is also bright. If the bright part is captured as the outline of the bottle opening, it will be mistakenly judged as a blockage at the bottle opening.

[0074] Figure 11 This is an image of the bottle opening obtained by the first imaging device 11 when it is facing the product to be tested in this embodiment. Figure 12 This is an image of the bottle opening acquired by the first imaging device 11 when the shooting angle shifts. Figure 11 and Figure 12 It can be seen that since the first light source 12 is a surface light source, a large area of ​​the product under test is illuminated. Even when the shooting angle shifts, the bright parts in the image still correspond to the location of the bottle opening, so the control module 40 can accurately obtain the outline of the bottle opening. Furthermore, according to... Figure 12 It can be seen that when the shooting angle is shifted, only the bottle opening is highlighted, and the bottle opening and the inside of the bottle are clearly distinguished, which can avoid misjudging that the bottle opening is blocked.

[0075] The detection system 1 of this embodiment includes a first detection module 10, which includes a first imaging device 11 and a first light source 12. The first light source 12 is a surface light source. During the imaging process of the first imaging device 11, because the first light source 12 is a surface light source, its illumination can maintain uniform brightness over a large area where the product to be tested is located. Even if the shooting angle is slightly off (i.e., the first imaging device 11 is not directly facing the product to be tested), a clear image of the product to be tested can still be obtained. Therefore, the detection system of this embodiment is beneficial for improving the quality of the image of the bottle opening captured by the first imaging device 11.

[0076] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed in this application.

Claims

1. A detection system, characterized in that, include: The first detection module includes a first imaging device and a first light source. The first imaging device is used to capture an image of the product under test, and the first light source is used to illuminate the product under test when the first imaging device captures the image of the product under test. The first light source includes a reflector and two light-emitting plates. Each light-emitting plate is a surface light source. The two light-emitting plates are arranged in parallel and their light-emitting surfaces are opposite to each other. The reflector includes two reflective parts, each of which is a plate-shaped structure with a reflective surface. The two reflective parts are arranged in parallel and their reflective surfaces are opposite to each other. The two reflective parts and the two light-emitting plates are sequentially arranged to form a cylindrical structure with a hollow space. The reflective surfaces are used to reflect and scatter light from the two light-emitting plates. The sensing module is used to generate a sensing signal when the product under test is sensed; as well as The control module is connected to the first imaging device, the first light source, and the sensing module respectively. When the sensing signal is received, the control module controls the first light source to emit light and controls the first imaging device to capture an image. The control module is also used to analyze the image to determine whether the product under test is qualified.

2. The detection system as described in claim 1, characterized in that, The reflector also includes a connecting part between the two reflective parts, and the connecting part has a through hole. The first imaging device is located on one side of the connecting part of the first light source and is used to capture an image of the product under test through the through hole.

3. The detection system as described in claim 1, characterized in that, The first detection module also includes a light-blocking plate, which is used to block external light.

4. The detection system as described in claim 1, characterized in that, It also includes a second detection module connected to the control module. The second detection module is used to acquire images of the product under test. The first detection module and the second detection module are used to capture images of the product under test at different positions. The control module is used to analyze the images acquired by the first detection module and the second detection module to determine whether the product under test is qualified.

5. The detection system as described in claim 4, characterized in that, The sensing module includes a first sensor. When the first sensor detects the product under test, the control module controls the second detection module to acquire an image of the product under test.

6. The detection system as described in claim 5, characterized in that, When the first sensor detects that the product under test has left the location of the first sensor, the control module controls the first detection module to acquire an image of the product under test.

7. The detection system as described in claim 5, characterized in that, The sensing module also includes a second sensor. When the second sensor detects the product under test, the control module outputs a signal to control the removal of the product under test.

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