Tobacco leaf foreign matter detection device

Abstract

The application relates to a tobacco leaf foreign matter detection device. The tobacco leaf foreign matter detection device comprises a conveying belt assembly, a light source assembly and a rotating shooting assembly, the conveying belt assembly is used for conveying tobacco leaves, the light source assembly is used for lighting the tobacco leaves on the conveying belt assembly, the rotating shooting assembly is located on a conveying path of the conveying belt assembly, the rotating shooting assembly comprises a rotating mechanism, a camera and a light supplementing unit, the output end of the rotating mechanism is connected with the camera and the light supplementing unit, the rotating mechanism is used for driving the camera to rotate and adjust a shooting angle, the camera is used for shooting the tobacco leaves on the conveying belt assembly, and the light supplementing unit is used for supplementing light when the camera is shooting. The tobacco leaf foreign matter detection device can adjust the shooting angle of the camera, shoot the tobacco leaves from multiple angles, supplement light for the camera, improve the definition of the camera shooting image, and improve the foreign matter detection efficiency.

Description

Technical Field

[0001] This application relates to the field of tobacco production technology, and in particular to a foreign matter detection device for tobacco leaves. Background Technology

[0002] The cigarette manufacturing process involves a series of steps, including rehydration, shredding, and drying of tobacco leaves, which transform the sheet tobacco leaves into finished tobacco shreds. The presence of foreign matter or impurities in the tobacco leaves can negatively impact subsequent cigarette production and overall quality. Therefore, to improve the overall quality of cigarettes, foreign matter and impurities must be detected and removed from the tobacco leaves before proceeding to the next stage of production.

[0003] In related technologies, a conveyor device is generally used to transport tobacco leaves, and a camera is used to photograph foreign objects in the tobacco leaf transport process. Since the camera and the conveyor device are relatively fixed, the camera can only take pictures of the tobacco leaf from a single angle. Therefore, the camera is easily affected by lighting and shooting angle, resulting in blurry images or inaccurate identification of foreign objects, which reduces the efficiency of foreign object detection. Utility Model Content

[0004] Therefore, it is necessary to provide a foreign object detection device for tobacco leaves that can adjust the shooting angle of the camera to take pictures of tobacco leaves from multiple angles, and can provide supplementary lighting to the camera to improve the clarity of the pictures and improve the efficiency of foreign object detection.

[0005] This application provides a foreign object detection device for tobacco leaves, including:

[0006] Conveyor belt assembly for conveying tobacco leaves;

[0007] A light source assembly for illuminating the tobacco leaves on the conveyor belt assembly;

[0008] A rotating shooting component is located on the conveyor path of the conveyor belt assembly. The rotating shooting component includes a rotating mechanism, a camera, and a supplementary lighting unit.

[0009] The output end of the rotating mechanism is connected to the camera and the fill light unit, and the rotating mechanism is used to drive the camera to rotate and adjust the shooting angle.

[0010] The camera is used to photograph the tobacco leaves on the conveyor belt assembly, and the supplementary lighting unit is used to provide supplementary lighting for the camera during the photographing process.

[0011] In one embodiment, the mechanism further includes a frame; the rotating mechanism includes a first rotating shaft, a transmission element, and a second rotating shaft.

[0012] The first rotating shaft includes a first shaft and a second shaft arranged coaxially. One end of the first shaft is rotatably connected to the frame, and the other end of the first shaft is connected to the second shaft. The outer diameter of the first shaft is smaller than the outer diameter of the second shaft, and the side wall of the second shaft abuts against the side wall of the belt of the conveyor belt assembly.

[0013] The second rotating shaft is connected to the first shaft via the transmission component; the second rotating shaft is connected to the camera and the supplementary lighting unit.

[0014] In one embodiment, the transmission component includes a first synchronous belt, a first drive shaft, a second drive shaft, and a second synchronous belt;

[0015] One end of the first drive shaft is rotatably connected to the frame, and the first drive shaft and the first shaft body are connected by the first synchronous belt.

[0016] One end of the second drive shaft is rotatably connected to the frame. The second drive shaft and the first drive shaft are connected by the second synchronous belt. The side wall of the second drive shaft is provided with drive teeth. The second rotating shaft is provided with driven teeth corresponding to the drive teeth. The drive teeth and the driven teeth mesh and drive each other.

[0017] In one embodiment, a strip groove is provided on one end face of the second drive shaft away from the frame, and the strip groove extends radially along the second drive shaft;

[0018] The transmission component further includes a tensioning shaft and a tensioning screw. The tensioning shaft includes a third shaft and a fourth shaft. One end of the third shaft is inserted into the strip groove, and the other end is connected to the fourth shaft. The end of the third shaft located in the strip groove has a threaded hole in the radial direction. The side wall of the second transmission shaft has a through hole coaxial with the threaded hole. The fourth shaft is connected to the first transmission via a second synchronous belt. The threaded section of the tensioning screw passes through the through hole and is connected to the threaded hole.

[0019] In one embodiment, the driven tooth is provided on a partial sidewall of the second drive shaft;

[0020] The second rotating shaft includes a rotating shaft body and a gear. One end of the rotating shaft body is connected to the frame, and the rotating shaft body is connected to the camera and the supplementary lighting unit. The gear is sleeved on the rotating shaft body, and the driven tooth is provided on the side wall of the gear.

[0021] The transmission component also includes a torsion spring; the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is connected to the frame, and the other end of the torsion spring is connected to the gear; when the driven gear disengages from the transmission gear, the torsion spring drives the gear to rotate, thereby driving the rotating shaft to rotate and reset.

[0022] In one embodiment, the rotating mechanism further includes a mounting base connected to the second rotating shaft.

[0023] In one embodiment, the supplemental lighting unit includes multiple LEDs arranged around the camera.

[0024] In one embodiment, the light source assembly includes multiple brackets and multiple light strips. The multiple brackets are spaced apart on the conveying path of the conveyor belt assembly. Each of the multiple brackets is connected to the frame. The light strips correspond one-to-one with the brackets and are detachably connected. The distance between the light strips and the conveyor belt assembly is adjustable.

[0025] In one embodiment, the light source assembly further includes a connector, and the bracket is provided with connection holes corresponding to the connector at intervals along a direction away from the conveyor belt assembly, and one end of the connector passes through the connection hole and is connected to the light strip.

[0026] In one embodiment, the transmission component further includes a support shaft rotatably connected to the frame, the line connecting the axis of the support shaft and the first rotating shaft being perpendicular to the conveying direction of the belt, and the sidewall of the support shaft abutting against the other sidewall of the belt away from the first rotating shaft.

[0027] The aforementioned tobacco foreign object detection device includes a rotating imaging component comprising a rotating mechanism, a camera, and a supplementary lighting unit. The output end of the rotating mechanism is connected to the camera and the supplementary lighting unit. The rotating mechanism is used to drive the camera to rotate and adjust the shooting angle, enabling multi-angle shooting of tobacco leaves on the conveyor belt assembly. Furthermore, the supplementary lighting unit provides supplementary lighting to the camera during shooting, preventing insufficient light due to changes in the shooting angle, thus avoiding blurry images and improving the clarity of the captured images. This, in turn, enhances the accuracy and efficiency of foreign object detection. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the tobacco foreign object detection device in the embodiments of this application.

[0029] Figure 2 This is a schematic diagram of the structure of the tobacco foreign object detection device in the embodiments of this application from another perspective.

[0030] Figure 3 This is a schematic diagram of the rotating mechanism in the embodiments of this application.

[0031] Figure 4 This is a front view of the rotating mechanism in an embodiment of this application.

[0032] Figure 5 This is a schematic diagram of the transmission component in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the tensioning shaft in an embodiment of this application.

[0034] The attached figures are labeled as follows:

[0035] 1. Frame; 2. Conveyor belt assembly; 21. Belt; 3. Light source assembly; 31. Bracket; 311. Connecting hole; 32. Light strip; 33. Connector; 4. Rotating shooting assembly; 41. Rotating mechanism; 411. First rotating shaft; 4111. First shaft body; 4112. Second shaft body; 412. Transmission component; 4121. First synchronous belt; 4122. First drive shaft; 4123. Second drive shaft; 41231. Transmission gear; 41232. Strip groove; 4124. Second synchronous belt; 413. Second rotating shaft; 4131. Rotating shaft body; 4132. Gear; 4125. Tensioning shaft; 41251. Third shaft body; 41252. Fourth shaft body; 4126. Tensioning screw; 42. Camera; 43. Fill light unit; 44. Mounting base; 45. Support shaft. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] See Figure 1An embodiment of this application provides a tobacco foreign object detection device, including a conveyor belt assembly 2, a light source assembly 3, and a rotating imaging assembly 4. The conveyor belt assembly 2 is used to transport tobacco leaves. The light source assembly 3 illuminates the tobacco leaves on the conveyor belt assembly 2, preventing the camera 42 from capturing blurry images due to insufficient light, thus affecting the accuracy and efficiency of foreign object detection. The rotating imaging assembly 4 is located on the conveying path of the conveyor belt assembly 2 and includes a rotating mechanism 41, a camera 42, and a supplementary lighting unit 43. The output end of the rotating mechanism 41 is connected to the camera 42 and the supplementary lighting unit 43. The rotating mechanism 41 is used to rotate the camera 42 to adjust the shooting angle; the camera 42 is used to capture images of the tobacco leaves on the conveyor belt assembly 2, and the supplementary lighting unit 43 provides supplementary lighting during the camera 42's capture process.

[0043] When the tobacco leaves on the conveyor belt assembly 2 reach the shooting range of the camera 42, the rotating mechanism 41 drives the camera 42 to rotate. As the rotating mechanism 41 rotates, the camera 42 can acquire images of the tobacco leaves from multiple angles. By analyzing and evaluating these images from multiple angles, foreign objects on the tobacco leaves can be accurately detected. Furthermore, because a supplementary lighting unit 43 is provided, it can rotate synchronously with the camera 42 under the drive of the rotating mechanism 41. This prevents the camera 42 from capturing images due to insufficient light caused by changes in the shooting angle, thus improving the clarity of the images captured by the camera 42 and enhancing the accuracy and efficiency of foreign object detection.

[0044] To facilitate the arrangement of the rotating mechanism 41, such as Figure 1 As shown, in one embodiment, the tobacco foreign object detection device further includes a frame 1. A rotating mechanism 41 is connected to the frame 1. Further, to reduce the drive structure of the rotating mechanism 41 and lower production costs, in this embodiment, the rotating mechanism 41 is driven by the belt 21 of the conveyor belt assembly 2. It should be noted that the conveyor belt assembly 2 is a standard part and can be directly purchased; therefore, the specific structure of the conveyor belt assembly 2 will not be described in detail. Specifically, as... Figure 2 , Figure 3 and Figure 4 As shown, the rotating mechanism 41 includes a first rotating shaft 411, a transmission component 412, and a second rotating shaft 413. To facilitate the belt 21 driving the first rotating shaft 411, as shown... Figure 5As shown, the first rotating shaft 411 includes a first shaft body 4111 and a second shaft body 4112 coaxially arranged. One end of the first shaft body 4111 is rotatably connected to the frame 1, and the other end of the first shaft body 4111 is connected to the second shaft body 4112. The outer diameter of the first shaft body 4111 is smaller than the outer diameter of the second shaft body 4112, and the side wall of the second shaft body 4112 abuts against one side wall of the belt 21 of the conveyor belt assembly 2. Therefore, when the belt 21 of the conveyor belt assembly 2 moves along the conveying direction, the second shaft body 4112 rotates due to friction with the belt 21, thereby eliminating the need for a separate drive structure for the rotating mechanism 41 and reducing costs. That is, after the second shaft body 4112 rotates, in order to enable the second rotating shaft 413 to drive synchronously, the second rotating shaft 413 is connected to the first shaft body 4111 through a transmission component 412; the second rotating shaft 413 is connected to the camera 42 and the supplementary lighting unit 43. That is, after the second shaft 4112 rotates, it is driven by the transmission component 412, which in turn drives the second rotating shaft 413 to rotate, so that the camera 42 and the supplementary light unit 43 on the second rotating shaft 413 rotate synchronously, realizing that the camera 42 can take pictures of the tobacco leaves from multiple angles.

[0045] Furthermore, such as Figure 5 As shown, to simplify the structure of the transmission component 412, in one embodiment, the transmission component 412 is a synchronous belt structure. Specifically, the transmission component 412 includes a first synchronous belt 4121, a first transmission shaft 4122, a second transmission shaft 4123, and a second synchronous belt 4124. One end of the first transmission shaft 4122 is rotatably connected to the frame 1, and the first transmission shaft 4122 and the first shaft body 4111 are connected via the first synchronous belt 4121. It should be noted that the sidewalls of both the first transmission shaft 4122 and the first shaft body 4111 are provided with meshing teeth (not shown in the figure) that engage with the first synchronous belt 4121. One end of the second transmission shaft 4123 is rotatably connected to the frame 1, and the second transmission shaft 4123 and the first transmission shaft 4122 are connected via the second synchronous belt 4124. It should be noted that the sidewalls of both the second transmission shaft 4123 and the first transmission shaft 4122 are provided with meshing teeth (not shown in the figure) that engage with the second synchronous belt 4124. In order to enable the transmission component 412 to drive the second rotating shaft 413 to rotate, the side wall of the second transmission shaft 4123 is provided with transmission teeth 41231, and the second rotating shaft 413 is provided with driven teeth corresponding to the transmission teeth 41231. The transmission teeth 41231 and the driven teeth mesh and transmit power.

[0046] When belt 21 drives the first rotating shaft 411 to rotate, the first rotating shaft 411 drives the second transmission shaft 4123 to rotate through the first synchronous belt 4121. Since the driven teeth on the second rotating shaft 413 mesh with the transmission teeth 41231 on the second transmission shaft 4123, the second rotating shaft 413 is driven to rotate, thereby enabling the camera 42 to take pictures of the tobacco leaves from multiple angles.

[0047] Furthermore, to improve the stability of the internal transmission of the transmission component 412 and prevent the second synchronous belt 4124 from becoming loose, which could lead to transmission failure between the first rotating shaft 411 and the second rotating shaft 413, the second synchronous belt 4124 needs to be tensioned to ensure it remains taut at all times. Figure 5 and Figure 6 As shown, in one embodiment, the end face of the second drive shaft 4123 away from the frame 1 is provided with a strip groove 41232, which extends radially along the second drive shaft 4123. The transmission component 412 also includes a tensioning shaft 4125 and a tensioning screw 4126. The tensioning shaft 4125 includes a third shaft body 41251 and a fourth shaft body 41252. One end of the third shaft body 41251 is inserted into the strip groove 41232, and the other end is connected to the fourth shaft body 41252. The end of the third shaft body 41251 located in the strip groove 41232 has a threaded hole radially. The side wall of the second drive shaft 4123 has a through hole coaxial with the threaded hole. The fourth shaft body 41252 is connected to the first drive via a second synchronous belt 4124. The threaded section of the tensioning screw 4126 passes through the through hole and is connected to the threaded hole.

[0048] It should be noted that, as Figure 5 As shown, the centerline of the strip groove along its length is located on the connecting line between the axes of the first rotating shaft 411 and the second rotating shaft 413. Thus, when the second synchronous belt 4124 needs to be tensioned, the tensioning screw 4126 is rotated, and the third shaft 41251 moves along the length of the strip groove 41232 away from the first rotating shaft 411, increasing the distance between the first rotating shaft 411 and the second rotating shaft 413, thereby tensioning the second synchronous belt 4124. In one embodiment, to fix the position of the tensioning screw 4126 after rotation, a locking nut is fitted on one end of the tensioning screw 4126 outside the second drive shaft 4123, and one end face of the locking nut abuts against the side wall of the second drive shaft 4123.

[0049] Furthermore, such as Figure 1 As shown, when camera 42 rotates to the back of conveyor belt assembly 2, its lens is positioned with its back to the conveyor belt assembly 2, making it impossible to photograph and detect the tobacco leaves on the conveyor belt assembly 2, which can easily lead to missed detections. Therefore, as Figure 5As shown, in one embodiment, to ensure that the tobacco leaves are always within the shooting range of the camera 42, a transmission tooth 41231 is provided on a partial sidewall of the second drive shaft 4123; the second rotating shaft 413 includes a rotating shaft body 4131 and a gear 4132. One end of the rotating shaft body 4131 is connected to the frame 1, and the rotating shaft body 4131 is connected to the camera 42 and the supplementary lighting unit 43; the gear 4132 is sleeved on the outside of the rotating shaft body 4131, and a driven tooth is provided on the sidewall of the gear 4132. Because the transmission tooth 41231 is partially provided on the second drive shaft 4123, the second drive shaft 4123 can only drive the second rotating shaft 413 to rotate when the transmission tooth 41231 meshes with the driven tooth. The rotation path of the camera 42 is a part of a circle, avoiding the lens from facing away from the conveyor belt assembly 2 when the camera 42 rotates, so that the conveyor belt assembly 2 is always within the shooting range of the camera 42. The actual rotation angle of the camera 42 can be adjusted by adjusting the number of driven teeth.

[0050] In some embodiments, to save costs, the drive motor of the conveyor belt assembly 2 is a common motor, meaning the motor can only rotate in one direction and cannot change the direction of rotation. Therefore, the conveying direction of the belt 21 remains unchanged. When the gear 4132 on the second rotating shaft 413 disengages from the transmission gear 41231 on the second transmission shaft 4123, the second rotating shaft 413 cannot drive the camera 42 to rotate synchronously and reset. To achieve the rotational reset of the second rotating shaft 413, in one embodiment, the transmission component 412 further includes a torsion spring (not shown in the figure). The torsion spring is sleeved on one end of the rotating shaft 4131 near the frame 1, with one end connected to the frame 1 and the other end connected to the gear 4132. When the driven gear disengages from the transmission gear 41231, the torsion spring can drive the gear 4132 to rotate in the opposite direction, thereby driving the rotating shaft 4131 to rotate and reset.

[0051] Furthermore, to facilitate the installation of the camera 42, in one embodiment, the rotating mechanism 41 further includes a mounting base 44, which is connected to the second rotating shaft 413. Both the camera 42 and the supplementary lighting unit 43 are connected to the mounting base 44 and are positioned towards the conveyor belt assembly 2. Even further, to facilitate supplementary lighting for the camera 42, the supplementary lighting unit 43 includes multiple LED beads arranged around the camera 42.

[0052] Furthermore, due to the different sizes and shapes of tobacco leaves, the required light intensity for the camera 42 to photograph the tobacco leaves varies as they are conveyed on the conveyor belt assembly 2. To facilitate adjustment of the lighting effect of the light source assembly 3, in one embodiment, the light source assembly 3 includes multiple brackets 31 and multiple light strips 32. The multiple brackets 31 are spaced apart along the conveying path of the conveyor belt assembly 2, and each bracket 31 is connected to the frame 1. The light strips 32 correspond one-to-one with the brackets 31 and are detachably connected. The distance between the light strips 32 and the conveyor belt assembly 2 is adjustable. As shown in the figure, the height difference between the light strips 32 and the conveyor belt assembly 2 can be adjusted by adjusting the installation position of the light strips 32 on the brackets 31, thereby meeting the lighting requirements of the camera 42 for photographing tobacco leaves of different sizes. Specifically, in one embodiment, the light source assembly 3 also includes a connector 33. The brackets 31 are provided with connecting holes 311 spaced apart along the direction away from the conveyor belt assembly 2, corresponding to the connector 33. One end of the connector 33 passes through the connecting hole 311 and connects to the light strip 32. Since the light strip 32 is connected to the bracket 31 via the connector 33, the height difference between the light strip 32 and the conveyor belt assembly 2 can be adjusted by adjusting the position of the connection hole 311 between the connector 33 and the bracket 31, thereby meeting the shooting requirements of the camera 42 and making it easy to adjust. It should be noted that the connector 33 can be a screw. That is, the threaded end of the connector 33 passes through the connection hole 311 and connects to the light strip 32, thus fixing the light strip 32 to the bracket 31.

[0053] Furthermore, such as Figure 4 As shown, the first rotating shaft 411 is located above the belt 21. The belt 21 is prone to localized sagging due to gravity, causing the sidewall of the belt 21 to fail to contact the first rotating shaft 411, thus preventing the first rotating shaft 411 from rotating. Therefore, to avoid transmission failure between the belt 21 and the first rotating shaft 411, as shown... Figure 4 As shown, in one embodiment, the transmission component 412 further includes a support shaft 45, which is rotatably connected to the frame 1. The line connecting the axis of the support shaft 45 and the first rotating shaft 411 is perpendicular to the conveying direction of the belt 21. The side wall of the support shaft 45 abuts against the other side wall of the belt 21 away from the first rotating shaft 411. The support shaft 45 can support the belt 21, preventing the belt 21 from sagging and causing transmission failure between it and the first rotating shaft 411, thereby improving the overall stability of the rotating mechanism 41.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A foreign object detection device for tobacco leaves, characterized in that, include: Conveyor belt assembly for conveying tobacco leaves; A light source assembly for illuminating the tobacco leaves on the conveyor belt assembly; A rotating shooting component is located on the conveyor path of the conveyor belt assembly. The rotating shooting component includes a rotating mechanism, a camera, and a supplementary lighting unit. The output end of the rotating mechanism is connected to the camera and the fill light unit, and the rotating mechanism is used to drive the camera to rotate and adjust the shooting angle. The camera is used to photograph the tobacco leaves on the conveyor belt assembly, and the supplementary lighting unit is used to provide supplementary lighting for the camera during the photographing process.

2. The tobacco foreign object detection device according to claim 1, characterized in that, It also includes a frame; the rotating mechanism includes a first rotating shaft, a transmission component, and a second rotating shaft; The first rotating shaft includes a first shaft and a second shaft arranged coaxially. One end of the first shaft is rotatably connected to the frame, and the other end of the first shaft is connected to the second shaft. The outer diameter of the first shaft is smaller than the outer diameter of the second shaft, and the side wall of the second shaft abuts against the side wall of the belt of the conveyor belt assembly. The second rotating shaft is connected to the first shaft via the transmission component; the second rotating shaft is connected to the camera and the supplementary lighting unit.

3. The tobacco foreign object detection device according to claim 2, characterized in that, The transmission component includes a first synchronous belt, a first drive shaft, a second drive shaft, and a second synchronous belt; One end of the first drive shaft is rotatably connected to the frame, and the first drive shaft and the first shaft body are connected by the first synchronous belt. One end of the second drive shaft is rotatably connected to the frame. The second drive shaft and the first drive shaft are connected by the second synchronous belt. The side wall of the second drive shaft is provided with drive teeth. The second rotating shaft is provided with driven teeth corresponding to the drive teeth. The drive teeth and the driven teeth mesh and drive each other.

4. The tobacco foreign object detection device according to claim 3, characterized in that, The second drive shaft has a strip-shaped groove on one end face away from the frame, and the strip-shaped groove extends radially along the second drive shaft; The transmission component further includes a tensioning shaft and a tensioning screw. The tensioning shaft includes a third shaft and a fourth shaft. One end of the third shaft is inserted into the strip groove, and the other end is connected to the fourth shaft. The end of the third shaft located in the strip groove has a threaded hole in the radial direction. The side wall of the second transmission shaft has a through hole coaxial with the threaded hole. The fourth shaft is connected to the first transmission via a second synchronous belt. The threaded section of the tensioning screw passes through the through hole and is connected to the threaded hole.

5. The tobacco foreign object detection device according to claim 4, characterized in that, The driven tooth is provided on a partial sidewall of the second drive shaft; The second rotating shaft includes a rotating shaft body and a gear. One end of the rotating shaft body is connected to the frame, and the rotating shaft body is connected to the camera and the supplementary lighting unit. The gear is sleeved on the rotating shaft body, and the driven tooth is provided on the side wall of the gear. The transmission component also includes a torsion spring; the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is connected to the frame, and the other end of the torsion spring is connected to the gear; when the driven gear disengages from the transmission gear, the torsion spring drives the gear to rotate, thereby driving the rotating shaft to rotate and reset.

6. The tobacco foreign object detection device according to claim 2, characterized in that, The rotating mechanism also includes a mounting base, which is connected to the second rotating shaft.

7. The tobacco foreign object detection device according to claim 2, characterized in that, The supplementary lighting unit includes multiple LEDs arranged around the camera.

8. The tobacco foreign object detection device according to claim 2, characterized in that, The light source assembly includes multiple brackets and multiple light strips. The multiple brackets are spaced apart on the conveying path of the conveyor belt assembly. Each bracket is connected to the frame. The light strips correspond one-to-one with the brackets and are detachably connected. The distance between the light strips and the conveyor belt assembly is adjustable.

9. The tobacco foreign object detection device according to claim 8, characterized in that, The light source assembly also includes a connector. The bracket is provided with connecting holes corresponding to the connectors at intervals along the direction away from the conveyor belt assembly. One end of the connector passes through the connecting hole and is connected to the light strip.

10. The tobacco foreign object detection device according to claim 2, characterized in that, The transmission component also includes a support shaft, which is rotatably connected to the frame. The line connecting the axis of the support shaft and the first rotating shaft is perpendicular to the conveying direction of the belt. The side wall of the support shaft abuts against the other side wall of the belt away from the first rotating shaft.

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