TW202346795A - Detection system - Google Patents

Abstract

The present disclosure provides a detection system including a first detection module, a sensing module, and a control module. The first detection module includes a first photographing device and a first light source. The first photographing device is used to capture an image of a product to be tested, and the first light source is an area light source, which is used to illuminate the product when the first photographing device captures the image of the product. The sensing module is used to generate a sensing signal when sensing the product. The control module connects the first photographing device, the first light source, and the sensing module, which is used to control the first light source emitting light and the first photographing device capturing the image when receiving the sensing signal. The control module is also used to analyze the image to determine whether the product is qualified.

Description

Detection system

This application relates to the technical field of product detection, and in particular to a detection system.

Producing a complete product often requires multiple production processes. After each production process is completed, the product usually needs to be quality tested to evaluate whether the product processed in the previous production process is qualified. A testing device used to detect whether a product is qualified. It obtains information such as the shape and structure of the product by taking images of the product, thereby evaluating whether the product is qualified. The detection device illuminates the product with a ring light source and captures an image of the product. Since the irradiation range of the ring light source is small, when it shines on the product, the light and darkness of different positions of the product are different. When the shooting angle changes, the light and dark distribution in the captured image will also change. During the image analysis process, the image is captured. The highlighted part in the image, so when the shooting angle changes, the highlighted part captured subsequently will shift. It can be seen that when using this kind of detection device using a ring light source to detect product quality, the requirements for the shooting angle are relatively high. That is to say, only the image of the product taken at a specific angle can be used to obtain the shape, structure and other information of the product. If the shooting angle is offset, the captured image will be unusable and the product information cannot be effectively obtained. information.

The embodiment of the present application provides a detection system, including: The first detection module includes a first photographing device and a first light source. The first photographing device is used to photograph the image of the product to be tested. The first light source is a surface light source and is used to photograph the first photographing device. The image of the product to be tested emits light to illuminate the product to be tested; A sensing module for generating a sensing signal when sensing the product under test; and A control module, respectively connected to the first shooting device, the first light source and the sensing module, for controlling the first light source to emit light and controlling the first shooting device to shoot when receiving the sensing signal. The control module is also used to analyze the image to determine whether the product to be tested is qualified.

The above-mentioned detection system includes a first detection module. The first detection module includes a first shooting device and a first light source. The first light source is a surface light source. During the shooting process of the first shooting device, since the first light source is a surface light source, the The emitted light can maintain uniform brightness within a large area where the product to be tested is located. Even if the shooting angle is offset (that is, the first shooting device does not shoot completely directly in front of the product to be tested), the product to be tested can still be photographed. A clear image of the product being tested.

The detection system provided in this application is used to detect whether the product to be tested is qualified. In this embodiment, the product to be tested is a plastic bottle with a label attached, and the detection system is used to detect whether the mouth and label of the plastic bottle meet the requirements. In this embodiment, the detection system evaluates whether the bottle mouth and label meet the requirements by taking images of the bottle mouth and label of the plastic bottle respectively.

In order to mass produce products, the production line is usually equipped with a conveyor device (such as a conveyor belt) to sequentially convey a plurality of products to be tested from the first processing station to the second processing station. When the detection system of this embodiment is used in a production line, it is fixed on the side of the conveyor. That is, during the operation of the production line, the conveyor device continues to convey the products to be tested, but the position of the detection system remains fixed, and the products to be tested passing through its position are detected in sequence.

Please refer to Figure 1. In this embodiment, the detection system 1 includes a first detection module 10, a second detection module 20, an induction module 30 and a control module 40. The control module 40 is connected to the first detection module 10 and the second detection module respectively. 20. The sensing module 30 is connected and communicates.

Please refer to Figure 2. In this embodiment, the detection system 1 also includes a main body bracket 50. The main body bracket 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 induction module 30 , and to fix and maintain the first detection module 10 and the second detection module 20 and the relative position between the sensing module 30.

Please refer to FIG. 3 . In this embodiment, the first detection module 10 includes a first shooting device 11 and a first light source 12 . In this embodiment, the first photographing device 11 is an industrial camera, which is used to capture images of the part to be tested (the bottle mouth in this embodiment) of the product to be tested. The first light source 12 is used to emit light when the first shooting device 11 is shooting, so as to enhance and even out the brightness of the shooting environment of the first shooting device 11 . In this embodiment, when the bottle of the product to be tested is placed on the conveyor 2, the bottom of the bottle directly contacts the conveyor 2. When the bottle passes the first camera 11, the bottle mouth is away from the conveyor 2 and toward the first camera 11. 11, so as to facilitate shooting by the first shooting device 11.

Please refer to FIG. 4 . In this embodiment, the first light source 12 includes two light-emitting panels 121 . Please refer to FIG. 5 . Each light-emitting panel 121 includes a substrate 1211 and a plurality of light-emitting elements (for example, light-emitting diodes) 1212 located on the same surface of the substrate 1211 . The plurality of light-emitting elements 1212 are arranged in an array at intervals. Each light-emitting element 1212 emits light. The elements 1212 emit light in the same direction, and the light emitted by each light-emitting element 1212 has the same brightness, so that each light-emitting plate 121 serves as a light source and emits light with uniform brightness across the entire surface.

The first light source 12 also includes a reflective plate 122 . The reflective plate 122 includes two reflective parts 1221 and a connecting part 1222 connected between the two reflective parts 1221. The two reflective parts 1221 and the connecting part 1222 are integrally formed. Each reflective part 1221 has a reflective surface S, and the reflective surface S is used to reflect the received light. In some embodiments, the reflective surface S of each reflective part 1221 is also used to scatter the received light.

In this embodiment, each light-emitting plate 121 and each reflective portion 1221 are substantially rectangular sheet structures. The connecting part 1222 is generally a sheet-like structure with a through hole 1223 opened, and is connected to one side of the two reflective parts 1221 respectively. The two luminescent plates 121 are arranged in parallel and spaced apart, and the surfaces of the two luminescent plates 121 for emitting light are arranged opposite to 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 to each other. The two opposite sides of each light-emitting plate 121 are connected to two reflective portions 1221 respectively, and the two opposite sides of each reflective portion 1221 are connected to two light-emitting plates 121 respectively. That is, the two light-emitting plates 121 and the two reflective parts 1221 together form a cylindrical structure with a hollow space 1224 .

In this way, 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, and can form light with uniform brightness in the hollow space 1224 to illuminate the product to be tested. In this embodiment, the two light-emitting panels 121 are both surface light sources, which can form a shooting environment with uniform brightness in a larger space, which is beneficial to improving the shooting quality.

In this embodiment, the reflective surface S of each reflective part 1221 is perpendicular to the plane along which the transmission device 2 extends. The first shooting device 11 is located on the side of the connecting part 1222 of the first light source 12 and faces the passage of the connecting part 1222. Hole 1223 set. That is, the orthographic projection of the first photographing device 11 on the first light source 12 is located in the through hole 1223 . In this way, the first photographing device 11 can photograph the image of the product to be tested through the through hole 1223 .

In this embodiment, the moving direction of the product to be tested on the conveyor 2 is the direction indicated by the dotted arrow in Figure 2 or Figure 8. The moving direction of the product to be tested is parallel to the two luminous plates 121 and perpendicular to the two reflective parts. 1221. The product to be tested has a certain height. In order to facilitate the passage of the product to be tested, the length of the sides of the two reflective parts 1221 connecting the luminescent plate 121 is shorter than the length of the side of the luminescent plate 121 connecting the reflective parts 1221 . That is, the two reflective parts 1221 are farther away from the transmission device 2 than the two light-emitting plates 121 . When the product to be tested is located directly below the first photographing device 11, the light emitted by the first light source 12 uniformly illuminates the product to be tested, and the first photographing device 11 captures an image of the bottle mouth of the product to be tested to obtain a clearer bottle mouth. outline.

In this embodiment, the first detection module 10 further includes two light baffles 13 . The two light shielding plates 13 are in the form of sheets of light shielding material. The two light baffles 13 are arranged in parallel and spaced apart, and are fixedly arranged on both sides of the conveyor 2 respectively. When the first light source 12 emits light, the two light baffles 13 are used to block external light to prevent the product to be tested from being illuminated by external light. That is, in this embodiment, the two light baffles 13 allow the illuminated area and brightness of the product to be tested to be determined by the first light source 12 as much as possible without being interfered by external light. When the product to be tested is transported to the first shooting device 11, the product to be tested is located between the two light baffles 13. The area between the two light baffles 13 isolates external light, so that the bottle mouth of the product to be tested is in contact with other products. The contrast of the position is increased, which is beneficial to obtaining a clear outline of the bottle mouth. The above-mentioned external light is, for example, light emitted by 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 to each other).

In other embodiments, the first light source 12 includes four luminescent panels instead of a reflective panel, that is, the four luminescent panels are connected in sequence and enclosed to form a cylindrical structure with a hollow space. The cylindrical structure in this embodiment can be seen in Figure 2. In this embodiment, since there are luminescent panels on all sides, it is no longer necessary to obtain light with uniform brightness through multiple reflections. Compared with the embodiment shown in FIG. 2, this is beneficial to improving the uniformity of light. However, the first light source 12 shown in FIG. 2 includes fewer light-emitting panels, which is beneficial to cost control.

The second detection module 20 is used to capture an image of the label of the product to be tested. Please refer to FIG. 6 . In this embodiment, the second detection module 20 includes a second shooting device 21 and a second light source 22 . In this embodiment, the second photographing device 21 is an industrial camera, used for photographing images of labels of products to be tested. The product to be tested also has a bottle body connecting the bottle mouth and the bottom of the bottle. The label is attached to the outer surface of the bottle body. When the product to be tested is placed on the conveyor 2 , the label faces the second shooting device 21 .

The second light source 22 is used to emit light when the second photographing device 21 is photographing, so as to enhance the brightness of the photographing environment of the second photographing device 21 . The second light source 22 includes a plurality of light-emitting elements (not shown, such as light-emitting diodes). The plurality of light-emitting elements are spaced in an array. Each light-emitting element emits light in the same direction, and the brightness of the light emitted by each light-emitting element is The same, so that the second light source 22 serves as a light source to emit light with uniform brightness across the entire surface.

In this embodiment, the second light source 22 is flat as a whole and has a through hole 221 . The second photographing device 21 is located on the side of the second light source 22 that emits light, and is used to photograph the image of the product to be tested through the through hole 221 .

In this embodiment, the second photographing device 21 and the first photographing device 11 are arranged sequentially along the extension direction of the conveying device 2 (that is, the displacement direction of the transported product to be tested), thereby sequentially collecting the labels and bottle mouths of the products to be tested. image. That is to say, during the process of being transported, the product to be tested first passes through the second photographing device 21, and the image of the label is captured by the second photographing device 21, and then passes through the first photographing device 11, and the bottle mouth is photographed by the first photographing device 11 image. In other embodiments, the position order of the first camera 11 and the second camera 21 may be different.

Please refer to Figure 7, because there may be multiple labels attached to the product to be tested, for example, when the product to be tested has a front label and a back label attached to it. In this embodiment, the detection system 1 includes two second detection modules 20. The two second detection modules 20 are symmetrically arranged on both sides of the conveyor 2 to respectively acquire images of different labels on the product to be tested. In other embodiments, the detection system 1 may only include one second detection module 20 .

Please refer to FIG. 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 may be infrared sensors, used to sense whether a product to be tested passes by at their location. The first sensor 31 and the second sensor 32 are used to emit infrared light. When a product to be tested passes by, the infrared light shines on the product to be tested and is reflected. The first sensor 31 and the second sensor 32 receive the reflection. Sensing signals can be generated when exposed to infrared light.

In this embodiment, the second detection module 20 , the first sensor 31 , the first detection module 10 and the second sensor 32 are sequentially arranged along the extension direction of the transmission device 2 . That is to say, in this embodiment, when the product to be tested is being transported, it first passes through the second detection module 20 , then passes through the first sensor 31 , then passes through the first detection module 10 , and finally passes through the second sensor 32 .

The control module 40 is a computer and can transmit data or signals with the first detection module 10 , the second detection module 20 , the first sensor 31 and the second sensor 32 in a wired or wireless manner. In this embodiment, wired connection is used between the control module 40 and the first detection module 10 and the second detection module 20 . The control module 40 is used to control the first shooting device 11 and the second shooting device 21 to take pictures, to control the first light source 12 and the second light source 22 to emit light and control the brightness of the light, and to receive the first sensor 31 and the second sensor The sensing signal of 32 is also used to analyze the captured image to obtain information about the product to be tested.

The working process of the detection system 1 of this embodiment will be described below with reference to FIG. 8 .

During the process of conveying the product to be tested by the conveying device 2, the product to be tested first arrives at the second detection module 20. When the product to be tested has just arrived at the second detection module 20, the detection system 1 does not take any action. The product to be tested continues to move. When the product to be tested reaches the first sensor 31, the first sensor 31 can generate a sensing signal. When the control module 40 receives the sensing signal, it can determine that the product to be tested is facing the second detection module 20 at this time, that is, it controls the second light source 22 to emit light, and controls the second shooting device 21 to capture an image. The image captured at this time image for the label.

The product to be tested has a certain volume, so it takes a certain amount of time from the time the product to be tested reaches the first sensor 31 to when the product to be tested completely leaves the first sensor 31 . That is, from the moment the product under test reaches the first sensor 31, in the next period of time, the first sensor 31 can continue to generate sensing signals, and the control module 40 can also continue to receive sensing signals. When the product to be tested completely leaves the first sensor 31, the first sensor 31 stops generating the induction signal, and the control module 40 switches from the state of receiving the induction signal to the state of not receiving the induction signal. In other words, starting from the moment when the product to be tested reaches the first sensor 31 , the first sensor 31 generates a trigger signal, and the trigger signal stops when the product to be tested completely leaves the first sensor 31 . The control module 40 can determine according to the switching of the above states that the product to be tested has reached the location of the first detection module 10 at this time, so the control module 40 controls the first light source 12 to emit light, and controls the first shooting device 11 to capture images. At this time The image taken is the image of the bottle mouth.

The first camera 11 and the second camera 21 are also used to transmit captured images back to the control module 40 . The control module 40 is used to receive the image of the label captured by the second photographing device 21 and determine which language the text on the label belongs to (for example, Chinese, English) based on the outline of the text on the label, thereby determining whether the label has been misplaced. The control module 40 is also used to receive the image of the bottle mouth captured by the first shooting device 11, capture the outline of the bottle mouth, and determine whether the shape of the bottle mouth is a preset shape (for example, a circle) and whether there is any remaining material at the bottle mouth. It has not been cut off, whether the bottle mouth is blocked, etc.

When the control module 40 determines that the label is attached correctly, the shape of the bottle mouth is correct, there is no remaining material at the bottle mouth, and the bottle mouth is not blocked, it is judged that the product to be tested is qualified; otherwise, the product to be tested is judged to be unqualified.

During the process of the control module 40 analyzing the above image, the product to be tested continues to move. The control module 40 can obtain the judgment result before the product to be tested reaches the second sensor 32 . When the product to be tested reaches the second sensor 32, the second sensor 32 can generate a sensing signal. The control module 40 is used to receive the induction signal, and based on the induction signal, it can be determined that the product to be tested has left the first detection module 10 .

If the control module 40 determines that the product to be tested is qualified and receives the induction signal returned by the second sensor 32, the product to be tested will not be operated, and the product to be tested can continue to be transferred to the next processing node by the conveying device 2. If the control module 40 determines that the product to be tested is unqualified, when receiving the induction signal returned by the second sensor 32, the corresponding structure on the control production line will remove the product to be tested on the conveyor 2 to avoid unqualified products. The tested product is sent to the next processing node. For example, there is an air blowing structure (not shown) on the production line. The control module 40 can be electrically connected to the air blowing structure and control the air blowing structure to blow the product to be tested out of the conveyor 2 .

Figure 9 is a pair of images of the bottle mouth acquired when the photographing device is facing the product to be tested, and Figure 10 is an image of the bottle mouth obtained when the photographing device has an offset shooting angle. When the control module receives the image returned by the shooting device, it will capture the highlights in the image and use them as the outline of the bottle mouth. Since the ring-shaped light source is used in this comparison example, its illumination range is small. When the shooting angle shifts, the position found by the light on the product to be tested will change, causing the highlighted area in the image to shift to the position of the bottle mouth. That is to say, when the shooting angle is shifted, in the captured image, the highlighted area no longer completely corresponds to the position of the bottle mouth, and a part of the bottle body is also highlighted. At this time, the control module captures the highlights in the image as the outline of the bottle mouth, which will lead to misjudgment of whether the product to be tested is qualified. Moreover, as can be seen from Figure 10, the inside of the product to be tested (that is, the inside of the bottle) is also highlighted. At this time, if the highlighted part is captured as the outline of the bottle mouth, it will also be misjudged as a blocked bottle mouth.

FIG. 11 is an image of the bottle mouth acquired when the first photographing device 11 of this embodiment is testing the product, and FIG. 12 is an image of the bottle mouth acquired when the first photographing device 11 has an offset shooting angle. It can be seen from Figures 11 and 12 that since the first light source 12 is a surface light source, a large range of the area where the product to be tested is illuminated. Even when the shooting angle is shifted, the highlighted part in the image still corresponds to the bottle mouth. position, the control module 40 can accurately obtain the outline of the bottle mouth. And according to Figure 12, it can be seen that when the shooting angle is offset, only the bottle mouth is highlighted, and the bottle mouth and the inside of the bottle are clearly distinguished, which can avoid misjudgment that the bottle mouth is clogged.

The detection system 1 of this embodiment includes a first detection module 10. The first detection module 10 includes a first shooting device 11 and a first light source 12. The first light source 12 is a surface light source. During the shooting process of the first shooting device 11 , since the first light source 12 is a surface light source, its luminescence can maintain uniform brightness in a large area where the product to be tested is located, even if the shooting angle is offset (that is, the first shooting device 11 does not shoot completely directly. Test product photography), you can also take clear images of the product to be tested. Therefore, the detection system of this embodiment is beneficial to improving the quality of the image of the bottle mouth captured by the first photographing device 11 .

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention and are not used to limit the present invention. As long as the above embodiments are appropriately made within the scope of the essential spirit of the present invention, Changes and variations are within the scope of the present invention.

1:Detection system 10: The first detection module 11:The first shooting device 12:First light source 121: Luminous panel 1211:Substrate 1212:Light-emitting component 122: Reflective plate 1221: Reflective part S: reflective surface 1222:Connection part 1223, 221:Through hole 1224: Hollow space 13:Light baffle 20: Second detection module 21:Second shooting device 22:Second light source 30: Induction module 31:First sensor 32: Second sensor 40:Control module 50:Main Bracket 2:Transmission device

Figure 1 is a schematic diagram of the module structure of the detection system in the embodiment of the present application.

Figure 2 is a schematic structural diagram of the detection system in the embodiment of the present application.

Fig. 3 is a schematic three-dimensional structural diagram of the first detection module in Fig. 2.

FIG. 4 is a disassembled schematic diagram of the first light source in FIG. 3 .

Figure 5 is a schematic structural diagram of the light-emitting panel in Figure 4.

Figure 6 is another structural schematic diagram of the detection system in the embodiment of the present application.

Figure 7 is another structural schematic diagram of the detection system in the embodiment of the present application.

Figure 8 is another structural schematic diagram of the detection system in the embodiment of the present application.

Figure 9 is a pair of images of the product to be tested taken when the photographing device is facing the product to be tested.

Figure 10 is a pair of images of the product under test taken by the photographing device when the photographing angle is shifted.

FIG. 11 is an image of the product to be tested captured by the first photographing device when the product is being tested in this embodiment.

FIG. 12 is an image of the product to be tested captured by the first photographing device when the photographing angle is shifted in this embodiment.

1:Detection system

10: The first detection module

20: Second detection module

30: Induction module

50:Main Bracket

2:Transmission device

Claims (10)

A detection system, the improvement of which includes: The first detection module includes a first photographing device and a first light source. The first photographing device is used to photograph the image of the product to be tested. The first light source is a surface light source and is used to photograph the first photographing device. When the image of the product to be tested is illuminated, the product to be tested is illuminated; A sensing module for generating a sensing signal when sensing the product under test; and A control module, respectively connected to the first shooting device, the first light source and the sensing module, for controlling the first light source to emit light and controlling the first shooting device to shoot when receiving the sensing signal. The control module is also used to analyze the image to determine whether the product to be tested is qualified. The detection system according to claim 1, wherein the first light source includes a reflective plate and two luminous plates; Each of the luminescent panels is a surface light source, the two luminescent panels are arranged in parallel and the light-emitting surfaces of the two luminescent panels are arranged oppositely; The reflective plate is used to reflect light from the two luminous plates. The detection system according to claim 2, wherein the reflective plate is also used to scatter the light from the two luminescent plates. The detection system according to claim 2, wherein the reflective plate includes two reflective parts, the two reflective parts are plate-shaped structures each having a reflective surface, the two reflective parts are arranged in parallel and the The reflective surfaces are arranged oppositely, and the two reflective parts and the two light-emitting parts are sequentially enclosed to form a cylindrical structure with a hollow space. The detection system according to claim 4, wherein the reflective plate further includes a connecting part connected between the two reflective parts, the connecting part has a through hole, and the first photographing device is located on the One side of the connection part of the first light source is used to capture an image of the product to be tested through the through hole. The detection system according to claim 1, wherein the first detection module further includes a light blocking plate, and the light blocking plate is used to block external light. The detection system according to claim 1, further comprising a second detection module connected to the control module, the second detection module being used to obtain an image of the product to be tested, the first detection module and The second detection module is used to take images of different positions of the product to be tested, and the control module is used to analyze the images obtained by the first detection module and the second detection module to determine whether the product to be tested is Test whether the product is qualified. The detection system according to claim 7, wherein the sensing module includes a first sensor, and when the first sensor senses the product to be tested, the control module controls the second detection module to obtain the An image of the product to be tested. The detection system according to claim 8, wherein when the first sensor senses that the product to be tested leaves the position of the first sensor, the control module controls the first detection module to obtain the Image of the product to be tested. The detection system of claim 8, wherein the sensing module further includes a second sensor. When the second sensor senses the product to be tested, the control module outputs a signal to control the removal of the product. Products to be tested.

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