Detection mechanism for detecting sealing defect of bottle cap by using laser

Abstract

The utility model provides a detection mechanism for detecting the sealing defect of a bottle cap by using laser, and the detection mechanism comprises a bottle conveying unit which is used for moving a detected bottle body; the laser transmitter is located on one side of the bottle conveying unit and obliquely and upwards irradiates light rays in the direction where the bottle conveying unit is located; the image acquisition unit comprises at least three cameras which are horizontally arranged around a vertical axis, and the vertical axis is located in the conveying direction of the bottle conveying unit and intersects with the light of the laser transmitter; the central angle between every two adjacent cameras is not larger than 120 degrees, and the positions of the cameras are higher than the positions of the laser emitters. According to the detection mechanism, laser with high brightness is used for lighting the inside of the bottle cap, so that obvious brightness difference exists inside and outside the bottle cap, the camera can clearly shoot the light transmission condition of the bottle cap, and the detection precision is improved. In addition, multiple cameras are adopted to shoot images, and a complete image of the side face of the bottle cap is obtained in a splicing and de-weighting mode, so that the problem of shielding at the front and back bridging positions during one-way or forward and reverse shooting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bottle cap sealing detection, in particular to a detection mechanism for detecting bottle cap sealing defects by using laser. Background Art

[0002] Bottled products are sealed with bottle caps after canning to prevent leakage of liquid in the bottle and facilitate transportation. However, in actual production, due to errors in adding the bottle caps or errors in the production process of the bottle caps themselves, defects such as cracks may appear on the bottle caps, affecting the sealing of the finished product. Therefore, after the canning production process of wine, beverage and other manufacturers, a process for detecting bottle cap sealing defects will be added.

[0003] In the prior art, for the detection of capping defects of transparent or translucent bottles, a single light source is generally used to illuminate the bottle cap from the front and / or back. However, if a single front light source is used for lighting, when the color of the damaged part is similar to the color of the bottle cap, the damage defect is not easy to be found and the recognition is not very good; if a single back light source is used for lighting, since the bottle cap is round, there is occlusion at the front and back bridges, and there is a blind spot for lighting, which affects the detection accuracy and there is a risk of missed detection. Even if the detection is performed by combining the two lighting methods, the above problems cannot be solved. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a detection mechanism for detecting bottle cap sealing defects by using laser.

[0005] The technical solution of this utility model is as follows:

[0006] A detection mechanism for detecting bottle cap sealing defects using laser, comprising:

[0007] Bottle transport unit, used to move the bottle to be inspected;

[0008] The laser emitter is located at one side of the bottle conveying unit and irradiates light upwards in an inclined direction toward the bottle conveying unit;

[0009] An image acquisition unit, comprising at least three cameras, which are horizontally arranged around a vertical axis, the vertical axis being located in the conveying direction of the bottle conveying unit and intersecting with the light of the laser transmitter;

[0010] The central angle between adjacent cameras is no greater than 120 degrees, and the camera is located higher than the laser transmitter.

[0011] The detection mechanism also includes a sensor unit, which is electrically connected to the laser emitter and each camera and is used to trigger the laser emitter and each camera to start.

[0012] During the inspection, the bottle conveying unit moves the inspected bottle. When the sensor unit detects the inspected bottle, a trigger signal is sent to the laser emitter and each camera. The laser emitter starts to irradiate the bottle, and the light is tilted from the bottom of the bottle cap to the inside of the bottle cap. At the same time, each camera starts to take a side image of the bottle cap. By combining and deduplicating the images taken by multiple cameras, a complete image of the side of the bottle cap is obtained.

[0013] Due to the extremely high brightness of the laser, the light transmittance of the bottle cap can be clearly observed around the bottle cap. Based on the brightness and shape of the highlighted light-transmitting area, it can be determined whether there are defects such as broken caps (such as broken rings, broken bridges, etc.).

[0014] In the above solution, the light of the laser transmitter is perpendicular to the conveying direction of the bottle conveying unit.

[0015] In order to adapt to the bottle cap detection of bottles of different sizes, the inclination angle of the laser transmitter light can be adjusted.

[0016] In order to ensure that the light emitted by the laser emitter is stable and does not shake, the detection mechanism also includes a first bracket, which is fixedly mounted on the detection table. The laser emitter is mounted on the first bracket, and its position is preferably adjustable to further adapt to the size of the bottle being detected.

[0017] In the present application, the central angles between adjacent cameras are equal, and further, the distances between each camera and the vertical axis around which it is located are equal.

[0018] In this way, the proportions of bottle caps in the images taken by each camera can be made the same, and the sizes of overlapping areas in the images taken by the cameras can be made the same. When the images are stitched together, deduplication and shearing can be performed at a uniform proportion, which facilitates the design of image processing programs.

[0019] In the present application, the image acquisition unit preferably includes four cameras, and the four cameras are arranged at a 90-degree angle in the horizontal plane, which is convenient for arranging the positions of the cameras and can also acquire the image directly opposite the side of the bottle cap as much as possible, making the detection more accurate.

[0020] In the above solution, four cameras are arranged in groups of two and are located on both sides of the bottle conveying unit.

[0021] Preferably, the laser emitter is located between two cameras on the same side.

[0022] In addition, the detection mechanism also includes a second bracket, and the camera is installed on the second bracket. The second bracket can stably support the camera, so that the camera can clearly capture images.

[0023] In the present application, the height of the camera on the second bracket is adjustable. The height of the camera can be adjusted according to the different sizes of the detected bottles, so that the camera can be located at the same height as the detected bottle caps.

[0024] The utility model provides a detection mechanism for detecting bottle cap sealing defects by using laser, which uses a laser with a strong light beam and high brightness to illuminate the inside of the bottle cap, so that an obvious brightness difference is produced between the inside and outside of the bottle cap, so that a camera can clearly capture the light transmission condition of the side of the bottle cap, and judge whether the bottle cap has defects such as broken rings, broken bridges, cracks, etc. according to the brightness and shape of the highlighted light transmission area, thereby improving the detection accuracy.

[0025] In addition, multiple cameras are used to capture images together, and a complete image of the bottle cap side is obtained by stitching and deduplication, avoiding the occlusion problem at the front and rear bridge when shooting in one direction or forward and reverse directions, effectively solving the blind spots of cracked cap defects in conventional capping inspection and improving inspection accuracy.

[0026] In addition, the laser is used as the light source in the present application, which is universal for bottle caps of different colors and materials, and there is no need to use light sources of different colors according to the changes in the bottle caps. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the attached picture:

[0028] Figure 1 It is an axonometric diagram of the detection mechanism;

[0029] Figure 2 is a side view schematic diagram of the detection mechanism;

[0030] Figure 3 It is a top view schematic diagram of the detection mechanism.

[0031] The components represented by the reference numerals in the figure are:

[0032] 1. Bottle conveying unit; 2. Laser transmitter; 3. Image acquisition unit; 31. Camera; 4. First bracket; 41. Vertical bar; 42. First cross bar; 43. Second cross bar; 5. Second bracket; 51. Vertical bar. DETAILED DESCRIPTION

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the utility model provides a detection mechanism for detecting bottle cap sealing defects using laser, including a bottle conveying unit 1, a laser emitter 2 and an image acquisition unit 3.

[0034] The bottle conveying unit 1 is used to move the bottle to be inspected.

[0035] The laser emitter 2 is located at one side of the bottle conveying unit 1 and irradiates light obliquely upward in the direction of the bottle conveying unit 1 .

[0036] The image acquisition unit 3 includes at least three cameras 31, which are horizontally arranged around a vertical axis. The vertical axis is located in the conveying direction of the bottle conveying unit 1 and intersects with the light of the laser transmitter 2. The lens of each camera 31 faces the vertical axis.

[0037] The central angle between adjacent cameras 31 is no greater than 120 degrees, and the camera 31 is located higher than the laser emitter 2 .

[0038] The detection mechanism further includes a sensor unit (not shown in the figure), which is electrically connected to the laser emitter 2 and each camera 31 and is used to trigger the laser emitter 2 and each camera 31 to start.

[0039] During the inspection, the bottle conveying unit 1 moves the inspected bottle body. When the sensor unit detects the inspected bottle body, a trigger signal is sent to the laser emitter 2 and each camera 31. The laser emitter 2 starts to irradiate the bottle body with light, and the light is obliquely injected into the bottle cap from the bottom of the bottle cap. At the same time, each camera 31 starts to take a side image of the bottle cap. By combining and removing duplicate images taken by multiple cameras 31, a complete image of the side of the bottle cap is obtained.

[0040] Due to the extremely high brightness of the laser, the light transmittance of the bottle cap can be clearly observed around the bottle cap. Based on the brightness and shape of the highlighted light-transmitting area, it can be determined whether there are defects such as broken caps (such as broken rings, broken bridges, etc.).

[0041] Now, the detection mechanism is described in detail in conjunction with specific embodiments as follows:

[0042] In this embodiment, the bottle conveying unit 1 adopts a crawler conveyor belt, the bottle to be inspected is placed on the conveyor belt, and the bottle conveying unit 1 is arranged on a detection platform (not shown in the figure).

[0043] The laser emitter 2 irradiates light above the bottle conveying unit 1 , and the light is perpendicular to the conveying direction of the bottle conveying unit 1 .

[0044] In this embodiment, in order to ensure that the light emitted by the laser emitter 2 is stable and does not shake, the detection mechanism further includes a first bracket 4 , which is fixedly mounted on the detection table and the laser emitter 2 is mounted on the first bracket 4 .

[0045] The first bracket 4 specifically includes a vertical rod 41 whose lower end is installed on the detection platform, a first cross bar 42 is connected to the vertical rod 41, a second cross bar 43 is connected to the first cross bar 42, the first cross bar 42 and the second cross bar 43 are perpendicular to each other, and the laser emitter 2 is installed on the second cross bar 43, and its inclination angle is adjustable, so that the inclination angle of the light emitted by it is adjustable to adapt to the bottle cap sealing detection of the detected bottles of different sizes.

[0046] In addition, the height of the first crossbar 42 on the vertical bar 41, the lateral position of the first crossbar 42 relative to the vertical bar 41, and the lateral position of the second crossbar 43 relative to the first crossbar 42 can all be adjusted, so that the position of the laser emitter 2 can be adjusted accordingly to further adapt to the size of the bottle being inspected.

[0047] In this embodiment, the image acquisition unit 3 includes four cameras 31, which are evenly distributed around the vertical axis. The central angles between adjacent cameras 31 are equal, and further, the distances between each camera 31 and the vertical axis are equal.

[0048] In this way, the proportion of bottle caps in the images taken by each camera 31 can be the same, and the size of the overlapping area on the images taken by the camera 31 can be the same. When the images are stitched together, deduplication and cutting can be performed at a uniform proportion, which is convenient for designing image processing programs.

[0049] The four cameras 31 are arranged at an angle of 90 degrees in the horizontal plane, which is convenient for arranging the positions of the cameras 31 and can also obtain the image directly opposite the side of the bottle cap as much as possible, making the detection more accurate.

[0050] In addition, the four cameras 31 are arranged in groups of two on both sides of the bottle conveying unit 1 , and the two cameras 31 on the same side are arranged along a conveying direction parallel to the bottle conveying unit 1 , and the laser transmitter 2 is located between the two cameras 31 on the same side.

[0051] In addition, the line of sight of the camera 31 lens is preferably horizontal, and its height is the same as the height of the bottle cap being inspected, so that the picture is taken facing the side of the bottle cap to avoid the inability to clearly capture the light transmittance of the bottle cap due to angle problems when shooting at an oblique angle, which may lead to misjudgment of the bottle cap sealing defect.

[0052] In order to stably support the camera 31 so that the camera 31 can clearly capture images, the detection mechanism further includes a second bracket 5 .

[0053] The second bracket 5 includes a pole 51, the lower end of which is mounted on the detection platform. The camera 31 is mounted on the pole 51, and the height of the camera 31 can be adjusted according to the different sizes of the detected bottles so that the camera 31 can be located at the same height as the detected bottle cap.

Claims

1. A detection mechanism for detecting bottle cap sealing defects using laser, characterized in that: include: A bottle conveying unit (1), used for moving the bottle to be inspected; The laser emitter (2) is located on one side of the bottle conveying unit (1) and emits light obliquely upward in the direction of the bottle conveying unit (1); An image acquisition unit (3) comprises at least three cameras (31) which are horizontally arranged around a vertical axis, the vertical axis being located in the conveying direction of the bottle conveying unit (1) and intersecting with the light of the laser emitter (2); The central angle between adjacent cameras (31) is no greater than 120 degrees, and the camera (31) is located at a position higher than the laser emitter (2).

2. A detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 1, characterized in that: The light of the laser emitter (2) is perpendicular to the conveying direction of the bottle conveying unit (1).

3. A detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 2, characterized in that: The inclination angle of the light of the laser emitter (2) is adjustable.

4. A detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 3, characterized in that: It comprises a first bracket (4), on which the laser emitter (2) is mounted, and its position is adjustable.

5. The detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 1, characterized in that: The central angles between adjacent cameras (31) are equal.

6. The detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 5, characterized in that: The distances between each camera (31) and the vertical axis around which it is located are equal.

7. A detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 6, characterized in that: The image acquisition unit (3) comprises four cameras (31).

8. The detection mechanism for detecting bottle cap sealing defects by using laser as claimed in claim 7, characterized in that: The four cameras (31) are respectively located on both sides of the bottle conveying unit (1).

9. A detection mechanism for detecting bottle cap sealing defects using laser as claimed in claim 8, characterized in that: The laser emitter (2) is located between two cameras (31) on the same side.

10. The detection mechanism for detecting bottle cap sealing defects by using laser as claimed in claim 9, characterized in that: It comprises a second bracket (5), on which the camera (31) is mounted and whose height is adjustable.

Images