A detection device for transparent bottles
By combining internal backlighting with external imaging, and utilizing a bottle rotation mechanism and acquisition system, the problem of adaptability and accuracy of traditional detection devices to transparent bottles of various shapes has been solved, achieving efficient and clear defect detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING DAHENG IMAGE VISION CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional detection devices are difficult to adapt to transparent bottles of various shapes, and suffer from problems such as shadow interference, image overlap and uneven lighting, resulting in poor detection accuracy and consistency.
By combining internal backlighting with external shooting, and using a bottle rotation mechanism to achieve 360° rotation, the system continuously captures multiple frames of images to eliminate shadow interference and improve image clarity.
It improves the adaptability and accuracy of transparent bottle inspection, reduces the false detection rate, and enhances the ability to detect defects in complex structures.
Smart Images
Figure CN224354345U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of quality inspection, and more specifically, to an inspection device for transparent bottles. Background Technology
[0002] In the liquid food, wine, and cosmetics industries, transparent bottles are commonly used as containers. To highlight the uniqueness of their products, manufacturers of different categories and brands often design various bottle types. These diverse transparent bottles feature various neck types, such as crown necks, threaded holes, and snap-fit necks. They also often incorporate prominent logos or designs on the bottle body; for example, some wine manufacturers use dragon patterns, angular shapes, or a combination of rounded and flat structures. Before filling, transparent bottles undergo quality inspection. Once the bottle quality is deemed acceptable, distinctive graphics or text are applied using techniques like baking or hot stamping to complete the overall bottle manufacturing process. During the quality inspection of the bottle body and the subsequent graphic / text finishing, online production quality control personnel inspect each bottle from neck to bottom, ensuring consistency and compliance of the processing technology through initial and subsequent inspections of multiple areas.
[0003] For quality inspection of transparent bottles, traditional inspection devices typically use external light sources to illuminate the bottle and then employ multiple cameras to capture images of the bottle at selected angles. Defects are revealed through these images from different angles. However, traditional inspection devices are only suitable for transparent bottles with no or simple patterns. For complex transparent bottles, due to their shape, traditional devices present several problems, including: 1) Significant differences in consistency between different bottle types necessitate the selection of appropriate light sources and shooting angles based on the specific shape, making them unsuitable for universal application; 2) Complex transparent bottles often have numerous uneven markings and regularly arranged ridges on their surfaces. These structures will cast shadows under non-uniform light sources, and the degree of shadow varies with the slight difference in the direction of the bottle in the detection area. These shadows will affect the accuracy of detection. In addition, due to the camera's line of sight, these graphic markings and ridge structures will also block each other when they are off the camera's optical axis, and cannot be fully displayed in the image, leading to false detections; 3) The current method of using external light sources for illumination is difficult to avoid the interference of uneven light caused by the refraction of external light sources; 4) Due to the transparent nature of the bottle, the method of using external light sources for illumination will cause the acquisition camera to simultaneously acquire images of the front and back side walls of the bottle, resulting in image overlap. The ridges or graphic information on the back side wall will interfere with the imaging of the front side wall, reducing image clarity. Utility Model Content
[0004] The purpose of this invention is to provide a detection device for transparent bottles, addressing the problems in the prior art. The device includes an illumination source, a bottle rotation mechanism, and a data acquisition system. The illumination source can extend into the interior of the transparent bottle to be tested to illuminate it. The bottle rotation mechanism is used to rotate the transparent bottle to be tested 360°. The data acquisition system is used to capture images of the transparent bottle rotating one full turn from the outside. By using internal backlighting, the device avoids interference from bottle shadows outside the acquisition area, thus obtaining complete and uniform images of the bottle and reducing the false detection rate.
[0005] The technical solution of this utility model is: a detection device for transparent bottles is provided. This device is used to reduce the overlap of bottle images by combining internal backlighting and external shooting. The detection device for transparent bottles includes: an illumination source, a bottle rotation mechanism and a data acquisition system.
[0006] The illumination source is used to extend into the interior of the transparent bottle to provide uniform illumination.
[0007] The bottle rotation mechanism is used to rotate the transparent bottle to be tested at a constant speed of 360°.
[0008] The acquisition head of the acquisition system is positioned opposite to the light-emitting end of the illumination source. The acquisition system is used to continuously capture multiple frames of images of the transparent bottle under test from the outside during the process of the transparent bottle under test rotating at a constant speed of 360°.
[0009] Furthermore, the illumination source is a strip diffused light source, and the acquisition system is set on one side of the transparent bottle, with its acquisition head facing the target detection area on the transparent bottle to be tested, and the light-emitting end of the illumination source facing the acquisition head.
[0010] Furthermore, the illumination source adopts a first light source, which includes an illumination head and a light guide. The illumination head is equipped with a first lamp bead, which is used to emit white light or single-wavelength light. The light guide is fixed at the lower end of the illumination head and is used to guide the light emitted by the first lamp bead and evenly illuminate the target detection area of the transparent bottle to be tested.
[0011] Furthermore, the width of the light guide is smaller than the inner diameter of the opening of the transparent bottle to be tested, and the length of the light guide is greater than the length from the opening of the transparent bottle to the lowest target detection area of the bottle body.
[0012] Furthermore, the illumination source adopts a second light source, which includes second LED beads arranged neatly from top to bottom and a diffuser plate. The diffuser plate is set in the light emission direction of the second LED beads to uniformly diffuse the light emitted by the second LED beads and illuminate the target detection area of the transparent bottle to be tested; the width of the second light source is smaller than the inner diameter of the mouth of the transparent bottle to be tested.
[0013] Furthermore, the length of the second light source is greater than the length from the mouth of the transparent bottle to the lowest target detection area on the bottle body.
[0014] Furthermore, the bottle rotation mechanism is located at the lower end of the transparent bottle to be tested, near the bottom of the bottle, and its position is lower than the lowest target detection area of the bottle.
[0015] Furthermore, the detection device for the transparent bottle also includes a light source moving module and a support module;
[0016] The light source moving module is positioned above the lighting source to provide support for it, while the bearing module is positioned below the transparent bottle to be tested to support it.
[0017] Furthermore, the detection device for the transparent bottle is used to extend the illumination source into the transparent bottle to be tested by moving the light source moving module downward, moving the support module upward, or simultaneously driving the light source moving module and the support module to move in opposite directions. After the transparent bottle to be tested has completed a 360° rotation, the illumination source is removed from the transparent bottle to be tested by moving the light source moving module upward, moving the support module downward, or simultaneously driving the light source moving module and the support module to move in opposite directions.
[0018] The beneficial effects of this utility model are:
[0019] First, the technical solution of this utility model includes a strip diffuse light source that illuminates from inside the bottle and a data acquisition system that captures images from outside the bottle. The light-emitting end of the light source and the acquisition head of the acquisition system are positioned opposite each other. Since the bottle wall between them is not obstructed or reflected by other areas of the bottle wall, the diffuse light received is strong. This method of internal backlighting and internal image acquisition can eliminate shadows in the image caused by bottle refraction or its own regional unevenness to the greatest extent, improve the imaging effect, and make the image background cleaner and more uniform. At the same time, it eliminates the interference of uneven structures or graphics on the bottle's rear side. The influence of the front image reduces image overlap on the bottle, making the outline of defects clearer and easier for machines or the naked eye to identify, thus reducing the difficulty of defect detection and differentiation. Compared with detection devices that require adjusting the position of the light source and the shooting angle according to the shape of the bottle, the technical solution in this invention is applicable to various transparent bottles that can be opened. It does not require frequent adjustment of the position of the light source and the shooting angle of the camera according to the shape characteristics of the bottle, making it more adaptable and more tolerant of bottles with inconsistent shapes. It avoids the overlap of front and rear images of the bottle and improves image clarity.
[0020] Secondly, the technical solution in this utility model can use a uniform diffused light source to illuminate the inside of the transparent bottle, which can avoid the interference of uneven light caused by the refraction of external light sources. The captured image can clearly show the defects located on the side wall of the bottle, improving the accuracy of subsequent defect detection.
[0021] Third, the technical solution of this utility model also includes a bottle rotation mechanism. This bottle rotation mechanism can rotate the transparent bottle 360° at a constant speed during the detection process, so that the acquisition system can continuously capture a sequence of images around the transparent bottle. Compared with the existing detection device that uses multiple fixed cameras to capture images of the transparent bottle on the conveying device, the technical solution of this utility model only requires a single camera to complete the detection of a target detection area, reducing the difficulty of detection. Moreover, with the transparent bottle rotating at a constant speed, a single camera can continuously capture multiple frames of images of the bottle, and the obtained bottle information is more comprehensive, further improving the accuracy of defect detection. Attached Figure Description
[0022] The advantages of the above and / or additional aspects of this utility model will become apparent and readily understood in the description of the embodiments taken in conjunction with the following drawings, wherein:
[0023] Figure 1 This is a schematic diagram of the overall structure of a detection device for a transparent bottle according to an embodiment of the present invention;
[0024] Figure 2 This is a schematic diagram of the structure of a first light source according to an embodiment of the present invention;
[0025] Figure 3 This is a schematic diagram of the disassembled structure of the first light source according to an embodiment of the present invention;
[0026] Figure 4 This is a schematic diagram of the structure of a second light source according to an embodiment of the present invention;
[0027] Figure 5 This is a schematic diagram of the distribution when the detection device of this utility model is used to acquire images of the first target bottle in Example 1;
[0028] Figure 6 This is an image of the bottle opening area of the first target bottle acquired using the existing detection device in Example 1;
[0029] Figure 7 This is an image of the bottle mouth area of the first target bottle acquired using the detection device of this utility model in Example 1;
[0030] Figure 8 This is the bright field unfolded image obtained by scanning the bottle mouth area line by line with a linear array camera in Example 1.
[0031] Figure 9 This is a schematic diagram of the distribution when the detection device of this utility model is used to acquire images of the second target bottle in Example 2;
[0032] Figure 10 This is an image of the area containing the graphic and textual information of the second target bottle, acquired using the existing detection device in Example 2;
[0033] Figure 11 yes Figure 10 Enlarged view of the area where the defect is located;
[0034] Figure 12 This is an expanded view of the area containing the graphic and textual information of the second target bottle body collected using the existing detection device in Example 2;
[0035] Figure 13 yes Figure 12 Enlarged view of the area where the defect is located;
[0036] Figure 14 This is a schematic diagram of the distribution when the detection device of this utility model is used to acquire images of the third target bottle in Example 3;
[0037] Figure 15 This is an unfolded diagram of the bottleneck region of the third target bottle, collected using the existing detection device in Example 3.
[0038] Figure 16 yes Figure 15 A magnified view of the area where the defect is located.
[0039] Among them, 1-lighting source, 11-first light source, 111-lighting head, 1110-first lamp bead, 1112-heat dissipation part, 1113-light emitting part, 112-light guiding part, 1121-light guide rod, 1122-light guide tube, 12-second light source, 121-second lamp bead, 122-diffusing plate, 2-bottle body rotation mechanism, 3-acquisition system, 4-light source moving module, 5-carrying module, 6-transparent bottle to be tested, 61-bottle mouth area, 62-bottle body graphic information, 63-bottleneck area, 7-diverging lens group. Detailed Implementation
[0040] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.
[0041] In the following description, many specific details are set forth in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.
[0042] like Figures 1 to 4As shown, this embodiment provides a detection device for transparent bottles. The device is used to reduce image overlap of the bottle by combining internal backlighting with external shooting. The device includes: an illumination source 1, a bottle rotation mechanism 2, and a data acquisition system 3.
[0043] The illumination source 1 is a strip diffused light source, which is set directly above the transparent bottle to be tested, and is used to extend into the transparent bottle to provide uniform illumination during testing; preferably, the illumination source 1 is a white light source or a single-wavelength light source.
[0044] The bottle rotation mechanism 2 is located at the lower end of the transparent bottle to be tested, and is used to rotate the transparent bottle to be tested at a constant speed of 360° after the test begins.
[0045] The acquisition system 3 is set on one side of the outside of the transparent bottle, with its acquisition head facing the target detection area on the transparent bottle to be tested. The light-emitting end of the illumination source 1 faces the direction of the acquisition head. The acquisition system 3 is used to acquire multiple frames of images of the transparent bottle to be tested in a continuous shooting manner during the process of the transparent bottle to be tested rotating at a constant speed of 360°.
[0046] In this embodiment, the multi-frame sequence image refers to a set of images taken frame by frame during the rotation of the bottle, which has temporal and angular continuity, i.e., a panoramic view.
[0047] The width of the illumination source 1 is smaller than the width of the opening of the transparent bottle to be tested, and the length of the illumination source 1 is greater than the length from the bottle opening to the lowest target detection area on the bottle body.
[0048] In this embodiment, the target detection area refers to the area on the transparent bottle to be tested that needs to be image acquired and defect detected, such as the bottleneck area, the bottle mouth area, and the graphic area on the bottle body; the lowest target detection area refers to the target detection area that is located at the lowest position when the transparent bottle to be tested is upright.
[0049] It should be noted that the illumination source 1 can be a first light source 11, which includes an illumination head 111 and a light guide part 112. The illumination head 111 is positioned above the transparent bottle to be tested, and a first LED bead 1110 with a small area of high brightness illumination is set inside it. The first LED bead 1110 is a point light source used to emit white light or single-wavelength light. The light guide part 112 is installed at the lower end of the illumination head 111 at a position corresponding to the first LED bead 1110, and is used to guide the light emitted by the first LED bead 1110 and uniformly illuminate the target detection area of the transparent bottle to be tested.
[0050] like Figure 3As shown, specifically, the lighting head 111 includes a heat dissipation part 1112 and a light-emitting part 1113. The light-emitting part 1113 is fixed to the lower end of the heat dissipation part 1112. The light-emitting part 1113 consists of an internal first lamp bead 1110 and an outer shell. The light emission direction of the first lamp bead 1110 is vertically downward. A diverging lens group 7 is provided inside the outer shell. The diverging lens group 7 is located in the light emission direction of the first lamp bead 1110. The light guide part 112 can be fixed to the lower part of the outer shell by means of threaded connection or tenon connection. The shape of the outer shell matches that of the light guide part 112 (i.e., the overall shape is smooth after connection). The diverging lens group 7 is used to diffuse the light emitted by the first lamp bead 1110 into the light guide part 112 to form a uniform and soft lighting field. The light guide part 112 can be a hard, milky-white solid light guide rod 1121 or a sleeve-type light guide tube 1122. Its diameter is smaller than the inner diameter of the mouth of the transparent bottle to be tested so that it can be inserted into the mouth. The length of the light guide part 112 is greater than the length from the mouth of the transparent bottle to the lowest target detection area of the bottle body.
[0051] It should be noted that the illumination source 1 can also be a second light source 12. The second light source 12 includes second LED beads 121 arranged neatly from top to bottom and a diffuser plate 122. The diffuser plate 122 is positioned in the light emission direction of the second LED beads 121 to uniformly diffuse the light emitted by the second LED beads 121 and illuminate the target detection area of the transparent bottle to be tested. Specifically, to achieve a uniform diffusion effect, the diffuser plate 122 can be configured as a tunnel shape, with the top and bottom ends using the same material to form a closed plate. The neatly arranged second LED beads 121 are fixed on the rectangular plate, and the two sides of the rectangular plate are fixedly connected to the two sides of the tunnel-shaped diffuser plate 122. The width of the second light source 12 is smaller than the inner diameter of the opening of the transparent bottle to be tested, and the length of the second light source 12 is greater than the length from the opening of the transparent bottle to the lowest target detection area of the bottle body.
[0052] like Figure 4 As shown, the second LED 121 can be a surface-mount LED or a pin-type LED; the diffuser 122 is made of a material that can achieve uniform light diffusion, has uniform optical properties, and will not form obvious bright spots or dark areas, such as milky white frosted acrylic sheet, polycarbonate diffuser plate, etc.
[0053] In this embodiment, the light guide portion 112 and the diffuser plate 122 can diffuse the light emitted by the lamp beads into a large-area uniform light field, so as to achieve soft, shadowless illumination of the transparent bottle to be tested, making it easy to observe small defects or foreign objects on the surface of the bottle.
[0054] like Figure 1As shown, the bottle rotation mechanism 2 is located at the lower end of the transparent bottle to be tested, near the bottom of the bottle. It is used to rotate the transparent bottle to be tested at a constant speed of 360° by twisting and turning (for example, the bottle rotation mechanism 2 can be rotated by clamping the transparent bottle to be tested with a block structure made of flexible material), so that the acquisition system 3 can acquire an image of the transparent bottle to be tested in one revolution. The position of the bottle rotation mechanism 2 is lower than the lowest target detection area of the bottle body, so it will not obstruct the acquisition system 3.
[0055] The acquisition system 3 can select a camera commonly used in defect detection. The camera's lens is pointed at the target detection area on the transparent bottle to be tested. The illumination source 1 can form uniform internal backlight illumination on the transparent bottle to be tested, so that the acquisition system 3 can avoid the shadow interference caused by the refraction of light from other areas of the bottle when acquiring images. This illumination method is suitable for transparent bottles of different shapes and has a higher tolerance for inconsistencies in the manufacturing process of the bottle.
[0056] The detection device for transparent bottles provided in this embodiment also includes a light source moving module 4 and a support module 5.
[0057] The light source moving module 4 is positioned above the lighting source 1 and is fixedly connected to the lighting source 1 via a threaded or tenon structure. The light source moving module 4 is used to provide support for the lighting source 1. The bearing module 5 is positioned below the transparent bottle to be tested and is used to support the transparent bottle to be tested.
[0058] It should be noted that the transparent bottle detection device can, when the transparent bottle to be tested moves to the predetermined detection position, bring the light source moving module 4 and the carrier module 5 closer together by pressing down the light source moving module 4, pulling up the carrier module 5, or simultaneously driving the light source moving module 4 and the carrier module 5 to move towards each other, so that the illumination light source 1 extends into the transparent bottle to be tested for illumination. After the transparent bottle to be tested completes a 360° rotation, the light source moving module 4 and the carrier module 5 are moved away from each other by moving up the light source moving module 4, moving down the carrier module 5, or simultaneously driving the light source moving module 4 and the carrier module 5 to move in opposite directions, so that the illumination light source 1 exits the transparent bottle to be tested and ends the illumination.
[0059] In this embodiment, the working principle of the detection device for the transparent bottle is as follows:
[0060] First, the pre-selected position is used as the detection position of the transparent bottle to be tested. The acquisition system 3 is fixed to one side of the detection position. The position of the acquisition system 3 is adjusted so that its acquisition head is horizontally facing the target detection area on the side wall of the transparent bottle to be tested. The position of the illumination source 1 is adjusted so that its light emission direction is towards the acquisition head of the acquisition system 3.
[0061] Next, the transparent bottle to be tested is placed on the carrier module 5, and the carrier module 5 moves it to the predetermined detection position; the lowest target detection area of the transparent bottle to be tested is determined, and the light source moving module 4 is driven to move downward or the carrier module 5 is moved upward, so that the illumination source 1 extends into the transparent bottle to be tested. When the lower end of the illumination source 1 is lower than the position of the lowest target detection area, the movement of the light source moving module 4 or the carrier module 5 is stopped.
[0062] In this embodiment, the predetermined detection position refers to the position where the acquisition head of the acquisition system 3 is facing, which is used to place or accommodate the transparent bottle to be tested. After the transparent bottle to be tested enters the predetermined detection position, the acquisition system 3 starts to acquire images.
[0063] In this embodiment, the illumination source 1 can be inserted into the transparent bottle to be tested for illumination by driving the light source moving module 4 downward or driving the carrier module 5 upward. Alternatively, the illumination source 1 can be inserted into the transparent bottle to be tested for illumination by driving the light source moving module 4 and the carrier module 5 to move towards each other simultaneously. When the light source moving module 4 and the carrier module 5 no longer move relative to each other, the transparent bottle to be tested is exactly at the predetermined detection position.
[0064] Finally, the illumination source 1 provides uniform illumination from the inside of the transparent bottle under test. The bottle rotation mechanism 2 is activated to rotate the transparent bottle under test 360° at a constant speed. At the same time, the acquisition system 3 continuously captures images of the target detection area of the transparent bottle under test to obtain a sequence of images of the target detection area rotating one revolution. The images are uploaded to the host computer for subsequent defect identification. After the transparent bottle under test stops rotating, the light source moving module 4 is driven to move upward or the carrying module 5 is moved downward, so that the illumination source 1 exits the transparent bottle under test. The carrying module 5 is used to move the transparent bottle under test out of the predetermined detection position.
[0065] It should be noted that the acquisition system 3 can use either an area scan camera or a line scan camera. When the transparent bottle under test is rotated at a constant speed of 360°, the area scan camera can obtain multiple images of the transparent bottle under test at different angles through continuous shooting. Similarly, the line scan camera can scan the rotating transparent bottle under test line by line and stitch the scanned images to finally obtain a 360° bright field unfolded image of the transparent bottle under test. Both types of cameras can achieve 360° coverage acquisition of the transparent bottle under test.
[0066] In this embodiment, the illumination source 1 can be removed from the transparent bottle under test by individually driving the light source moving module 4 upward or individually driving the carrier module 5 downward. Alternatively, the illumination source 1 can be removed from the transparent bottle under test by simultaneously driving the light source moving module 4 and the carrier module 5 to move in opposite directions. When there are multiple transparent bottles under test, the above steps can be repeated until all transparent bottles under test have been photographed.
[0067] Example 1: The push-button transparent glass bottle, which is common in the liquor industry, was selected as the primary target bottle type, such as... Figure 5 As shown, the bottle opening of the first target bottle has a multi-layered annular structure. The bottle opening of the first target bottle is detected using both existing detection devices and the detection device of this application. The existing detection device includes a surface light source and a camera, specifically comprising:
[0068] Using existing detection equipment: the first target bottle is positioned between the surface light source and the acquisition camera, with all three arranged coaxially. The acquisition camera then captures an image of the first target bottle, such as... Figure 6 As shown, from Figure 6 As can be seen, due to the refraction of light by the multi-layered annular structure of the bottle mouth and the regional unevenness of the bottle itself, there are a large number of irregular shadows in the acquired images, as shown by shadow 302 in the figure. When these irregular shadows are distributed around defect 301, they will interfere with it, making the outline of the defect impossible to be identified by the machine or the naked eye, making it difficult to detect and distinguish.
[0069] Using the detection device of this application: An illumination source 1 is inserted into the interior of the first target bottle, such that its lower surface is below the location of the fourth annular structure in the bottle opening area. An image of the first target bottle is captured from the outside using the acquisition system 3. Figure 7 As shown, from Figure 7 As can be seen, due to the uniform illumination of the bottle mouth area by the illumination source 1, the irregular shadows caused by the refraction of the bottle body in the acquired image are eliminated, and the image effect is greatly improved. Compared with the images acquired by existing detection devices, the images acquired by the detection device of this application have a clean background, clear defect outlines, and are easy to be identified by machines or the naked eye, making it easier to distinguish defects.
[0070] The detection device used in this application can perform 360° coverage sampling of the bottle opening area of the first target bottle, such as... Figure 8 The image shows a bright-field unfolded image obtained by scanning the bottle mouth area line by line with a linear array camera. As can be seen from the image, there is only one defect 301 in the bottle mouth area of the first target bottle. Defect 301 is a broken defect in the area where the third ring structure is located.
[0071] Example 2: Select a common transparent baby bottle as the second target bottle, such as... Figure 9 As shown, the second target bottle has graphic and textual information on both the front and back. The graphic and textual information on the second target bottle is detected using both existing detection devices and the detection device of this application, specifically including:
[0072] Using existing detection equipment: the second target bottle is positioned between the surface light source and the acquisition camera, and the acquisition camera is used to capture images of the second target bottle, such as... Figure 10 As shown in the image, because the second target bottle is transparent, under normal backlighting conditions, the images and text on the back of the bottle will block the light, creating shadows that interfere with the detection of defects on the front of the bottle. This affects the detection of defects in the images and text on the front of the bottle. Figure 11 for Figure 10 The enlarged view of the local defect location shows that defect 321 is relatively blurry and difficult to identify due to the influence of the text and images on the back of the bottle.
[0073] Using the detection device of this application: An illumination source 1 is inserted into the interior of the second target bottle, so that its lower surface is lower than the position of the text and images on the bottle. The second target bottle is rotated using a bottle rotation mechanism 2, while a line scan camera is used to capture a bright-field unfolded image of the second target bottle from the outside, such as... Figure 12 As shown in the image, even under the specific backlighting conditions described in this application, the text and images on the back of the bottle do not interfere with the text and images on the front. The background is clean and uniform, without shadows, resulting in clearer text and images. Figure 13 for Figure 12 The magnified image of the corresponding local defect location clearly shows defect 321, which is helpful for image detection. Defect 321 is a text and image incomplete defect.
[0074] Example 3: Select a transparent bottle with a complex shape as the third target bottle, such as... Figure 14 As shown, the bottle neck has uneven edges. The detection device of this application is used to detect the neck area of the third target bottle, specifically including:
[0075] The illumination source 1 is inserted into the third target bottle, so that its lower surface is below the lower edge of the bottle neck. The bottle rotation mechanism 2 rotates the third target bottle 360° at a uniform speed. Simultaneously, a line scan camera is used to capture a bright-field unfolded image of the third target bottle from the outside. Figure 15 As shown.
[0076] Because the neck of the third target bottle has multiple uneven edges, under normal backlighting conditions, the edges on the back of the bottle will cast shadows on the image of the front of the bottle, weakening the outline of the defect and making it difficult to identify. The detection device of this application can present the uneven edges more uniformly, such as... Figure 15As shown in the figure, only one defect, 331, exists at the bottleneck of the third target bottle. Defect 331 is an impurity defect inside the bottle. Figure 16 for Figure 15 The enlarged view of the defect location clearly shows the outline of defect 331. This demonstrates that the detection device of this application can greatly reduce the shadow interference caused by the complex structure on the bottle and enhance the accuracy of defect detection.
[0077] In this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0078] The shapes of the components in the accompanying drawings are schematic and may differ from their actual shapes. The drawings are only used to illustrate the principle of this utility model and are not intended to limit this utility model.
[0079] Although the present invention has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and not intended to limit the application of the present invention. The scope of protection of the present invention is defined by the appended claims and may include various modifications, alterations, and equivalents made to the invention without departing from the scope and spirit of the present invention.
Claims
1. A detection device for transparent bottles, characterized in that, The device is used to reduce the overlap of bottle images by combining internal backlighting with external shooting. The detection device for the transparent bottle includes: an illumination source (1), a bottle rotation mechanism (2), and an acquisition system (3). The illumination source (1) is used to extend into the interior of the transparent bottle to be tested and provide uniform illumination. The bottle rotation mechanism (2) is used to rotate the transparent bottle to be tested at a constant speed of 360°. The acquisition head of the acquisition system (3) is set opposite to the light-emitting end of the illumination source (1). The acquisition system (3) is used to continuously capture multiple frames of images of the transparent bottle under test from the outside during the process of the transparent bottle under test rotating at a constant speed of 360°.
2. The detection device for transparent bottles as described in claim 1, characterized in that, The illumination source (1) is a strip diffuse light source. The acquisition system (3) is set on one side of the transparent bottle, with its acquisition head facing the target detection area on the transparent bottle to be tested. The light-emitting end of the illumination source (1) faces the acquisition head.
3. The detection device for transparent bottles as described in claim 2, characterized in that, The illumination source (1) adopts a first light source (11), which includes an illumination head (111) and a light guide (112). The illumination head (111) is equipped with a first lamp bead (1110), which is used to emit white light or single-wavelength light. The light guide (112) is fixed at the lower end of the illumination head (111) and is used to guide the light emitted by the first lamp bead (1110) and uniformly illuminate the target detection area of the transparent bottle to be tested.
4. The detection device for transparent bottles as described in claim 3, characterized in that, The width of the light guide portion (112) is smaller than the inner diameter of the opening of the transparent bottle to be tested, and the length of the light guide portion (112) is greater than the length from the opening of the transparent bottle to the lowest target detection area of the bottle body.
5. The detection device for transparent bottles as described in claim 1, characterized in that, The illumination source (1) adopts a second light source (12), which includes a second lamp bead (121) arranged neatly from top to bottom and a diffuser plate (122). The diffuser plate (122) is set in the light emission direction of the second lamp bead (121) to uniformly diffuse the light emitted by the second lamp bead (121) and illuminate the target detection area of the transparent bottle to be tested. The width of the second light source (12) is smaller than the inner diameter of the mouth of the transparent bottle to be tested.
6. The detection device for transparent bottles as described in claim 5, characterized in that, The length of the second light source (12) is greater than the length from the mouth of the transparent bottle to the lowest target detection area of the bottle body.
7. The detection device for transparent bottles as described in claim 1, characterized in that, The bottle rotation mechanism (2) is located at the lower end of the transparent bottle to be tested, near the bottom of the bottle, and its position is lower than the lowest target detection area of the bottle.
8. The detection device for transparent bottles as described in claim 1, characterized in that, The detection device for the transparent bottle also includes a light source moving module (4) and a carrying module (5); The light source moving module (4) is positioned above the lighting source (1) to provide support for the lighting source (1), and the bearing module (5) is positioned below the transparent bottle to be tested to support the transparent bottle to be tested.
9. The detection device for transparent bottles as described in claim 8, characterized in that, The detection device for the transparent bottle is used to extend the illumination source (1) into the transparent bottle to be tested by moving the light source moving module (4) downward, moving the bearing module (5) upward, or simultaneously driving the light source moving module (4) and the bearing module (5) to move in opposite directions. After the transparent bottle to be tested has completed a 360° rotation, the illumination source (1) is removed from the transparent bottle to be tested by moving the light source moving module (4) upward, moving the bearing module (5) downward, or simultaneously driving the light source moving module (4) and the bearing module (5) to move in opposite directions.