Cigarette strip appearance detection device based on machine vision
By combining an Ethernet color camera with a white illumination structure, the problem of existing equipment's inability to detect the appearance of cigarette packs has been solved, achieving efficient and accurate cigarette pack appearance detection and improving production quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2026-03-31
AI Technical Summary
Existing visual inspection equipment is not ideal for detecting appearance problems of cigarette packs, especially in distinguishing between broken or exposed white defects in blue cigarette packs, leading to the omission of important information.
An Ethernet color camera, combined with an arched optical path structure and white illumination, is used to illuminate the end face of the cigarette pack at a 45° angle using long and short white LED light sources, combined with a through-beam laser sensor to achieve efficient and accurate cigarette pack appearance inspection.
It achieves uniform illumination and clear imaging of all sides of the cigarette bar, improving the accuracy of inspection and production efficiency, and ensuring the quality of the cigarette bar.
Smart Images
Figure CN224058096U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of detection technology, and more specifically, to a machine vision-based device for inspecting the appearance of cigarette packs. Background Technology
[0002] During the process of completing the cellophane packaging of cigarette sticks, some appearance defects may be encountered, such as damaged packaging, surface scratches, unevenness, unclear printing, or stains. Simultaneously, the cellophane itself may also have problems, such as damage, unevenness, scratches, missing pull tabs, or damaged pull heads. To prevent these substandard products from entering the market and causing quality issues, it is necessary to install testing equipment for quality monitoring.
[0003] Most currently used visual inspection devices are typically equipped with a monochrome camera and a blue light source, and employ algorithms based on traditional visual inspection rules. This method works well for detecting problems with transparent paper, but its performance is not ideal for detecting the appearance of cigarette packs. For example, when a blue cigarette pack has defects such as tears or exposed white areas, under blue light, the image captured by the monochrome camera is not significantly different from the image of a defect-free cigarette pack, making it difficult to distinguish effectively and causing much important information to be missed.
[0004] Therefore, a machine vision-based device for inspecting the appearance of cigarette packs is needed. Utility Model Content
[0005] To solve the above-mentioned technical problems, this application provides the following technical solution: a machine vision-based cigarette bar appearance inspection device, which includes: an inspection device and a conveyor belt;
[0006] The detection device includes a front detection component and an end detection component. The front detection component includes an arched optical path structure that spans over the conveyor belt. The surface of the arched optical path structure facing the conveyor belt is covered with a white matte paint. Several Ethernet color cameras facing the conveyor belt are installed on the arched optical path structure, and the lens interface of the Ethernet color cameras is equipped with a low distortion lens.
[0007] The end face detection components are configured in two groups, respectively facing each other on both sides of the conveyor belt's movement direction. Each group of end face detection components includes a support plate. The support plate is equipped with a set of white long strip LED light sources, a set of end face cameras, two sets of white short strip LED light sources, and a through-beam laser sensor. The end face cameras are installed at the center of the support plate, the white short strip LED light sources are installed on both sides of the end face cameras, and the through-beam laser sensors are installed between the white short strip LED light sources and the end face cameras.
[0008] Preferably, the Ethernet color cameras are a first left-side camera, a second left-side camera, a first top camera, a second top camera, a first right-side camera, a second right-side camera, and two sets of end-face cameras.
[0009] Preferably, the optimal angle at which the white short strip LED light source illuminates the end face of the cigarette strip is 45°.
[0010] Preferably, the machine vision-based cigarette bar appearance inspection device further includes a separation device, which is installed on the left side of the inspection device. The separation device includes a separation sensor, a servo motor, a synchronous belt pulley, and a reduction wheel. It controls two servo motors to drive the synchronous belts on both sides to run in opposite directions through a dual-axis servo driver, so as to complete the clamping and separation operation of the cigarette bar.
[0011] Preferably, the detection device further includes an emergency stop device, which is installed on the outside of the housing of the detection device, near the separation device.
[0012] Preferably, the machine vision-based cigarette bar appearance inspection device further includes a control cabinet, which is installed below the conveyor belt. The control cabinet includes an external interface, a power switch, a power interface, and a power indicator light. The external interfaces are all led out from both sides of the control cabinet. The power switch and the power indicator light are both located on the right side of the control cabinet, and the power interface is located at the bottom rear side of the control cabinet.
[0013] The control cabinet further includes an industrial computer, a control board, a servo driver, and a power module. The industrial computer is installed in the lower left corner of the control cabinet and has 8 PoE interfaces, 2 Gigabit Ethernet interfaces, and RS422 and RS232 serial communication interfaces. The control board is installed in the upper right corner of the control cabinet and includes a control unit, a camera communication interface, a light source communication interface, and I / O interfaces. The servo driver is located on the left side of the control board. The power module is installed in the lower right corner of the control cabinet and includes a load isolating switch, a filter, and a switching power supply, wherein the switching power supply converts 220V power to 24V power.
[0014] The control cabinet is equipped with a heat dissipation module on each side. The heat dissipation module includes two sets of fan accessories and two sets of fan assemblies. Each set of fan accessories and fan assemblies is installed on both sides of the control cabinet. One set of fan assemblies blows external air into the control cabinet, and the other set of fan assemblies blows internal hot air out of the control cabinet.
[0015] Preferably, the machine vision-based cigarette stick appearance inspection device further includes a rejection device, which is installed on the right side of the inspection device and includes a solenoid valve, a rejection cylinder, a fiber optic sensor, and a rejection frame. The solenoid valve is connected to the rejection cylinder through an air pipe, and an air storage tank is installed between the solenoid valve and the air pipe.
[0016] The rejection cylinder includes a cylinder push rod, and above the cylinder push rod is a protective device to protect it from damage during its maximum stroke.
[0017] Compared with existing technologies, this application provides a machine vision-based cigarette bar appearance inspection device. It utilizes two servo motors to control a synchronous belt running in opposite directions to achieve efficient deceleration and separation of the cigarette bars. Furthermore, it employs an Ethernet color camera, combined with an arched white illumination structure, to image the top and long sides of the cigarette bar. Simultaneously, a short strip light source illuminates the two end faces of the cigarette bar at a 45° angle to ensure uniform illumination on all sides, thereby achieving efficient and accurate inspection of the cigarette bar's appearance and improving production quality and efficiency. Attached Figure Description
[0018] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.
[0019] Figure 1 The figure shows an electrical principle block diagram of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application.
[0020] Figure 2 The figure shows an overall structural installation diagram of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application.
[0021] Figure 3 The figure shows a schematic diagram of the separation device structure of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application.
[0022] Figure 4 The figure shows a schematic diagram of the detection device structure of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application.
[0023] Figure 5 The figure shows a schematic diagram of the control cabinet structure of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application.
[0024] Figure 6The figure shows a schematic diagram of the rejection device structure of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application.
[0025] In the diagram: 1 Separation device, 2 Detection device, 3 Control cabinet, 4 Rejection device, 5 Conveyor belt, 1-1 Separation conveyor, 1-2 Servo motor, 1-3 Synchronous pulley, 1-4 Reduction wheel, 2-1 Arched optical path structure, 2-2 First left side camera, 2-3 Second left side camera, 2-4 First top camera, 2-5 Second top camera, 2-6 First right side camera, 2-7 Second right side camera, 2-8 End face camera, 2-9 Short strip LED light source, 2-10 Through-beam laser sensor, 2-11 Smoke bar, 2-12 Support plate, 3-1 Industrial computer, 3-2 Control board, 3-3 Servo driver, 3-4 Power module, 3-5 Heat dissipation module, 4-1 Solenoid valve, 4-2 Rejection cylinder, 4-3 Fiber optic sensor, 4-4 Rejection frame. Detailed Implementation
[0026] The exemplary embodiments according to this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.
[0027] Example:
[0028] Figure 1 The diagram illustrates the electrical principle block diagram of a machine vision-based cigarette bar appearance inspection device according to an embodiment of this application. Figure 1 As shown in the diagram, this provides a clear view of the system architecture, demonstrating how the various components work together to achieve the appearance inspection and rejection of cigarette packs. It helps in understanding the system's workflow, facilitating design, debugging, and maintenance. The following section will provide a more detailed analysis of the main components of the machine vision-based cigarette pack appearance inspection device and the connections between them.
[0029] like Figure 2 As shown, the machine vision-based cigarette bar appearance inspection device of this application includes: a separation device 1, an inspection device 2, a control cabinet 3, a rejection device 4, and a conveyor belt 5. The separation device 1 is installed on the left side of the inspection device 2, and a human-machine interface is installed on the bracket between the separation device 1 and the inspection device 2. The rejection device 4 is installed on the right side of the inspection device 2, and the control cabinet 3 is installed below the conveyor belt 5.
[0030] like Figure 3As shown, the separation device 1 includes: a separation sensor 1-1, a servo motor 1-2, a synchronous pulley 1-3, and a reduction wheel 1-4. It should be understood that during the production of cigarette sticks 2-11, sometimes the transparent paper of two cigarette sticks 2-11 may stick together, which may interfere with subsequent quality inspection. Therefore, a dual-axis servo drive controls two servo motors 1-2 to drive the reduction wheel 1-4 to rotate in the opposite direction to the running direction of the cigarette sticks 2-11, thereby slowing down the movement speed of the cigarette sticks 2-11. At the same time, the conveyor belt 5 at the bottom maintains its original speed. In this way, the two sticking cigarette sticks 2-11 are separated, ensuring the accuracy and smooth progress of subsequent inspection processes.
[0031] Specifically, to ensure the stability of the cigarette stick 2-11 as it moves laterally on the conveyor belt 5, a thin steel wire is installed on each side of the conveyor belt 5. By constraining the two ends of the cigarette stick 2-11 with the two thin steel wires, the view of the camera is not affected, the obstruction is minimal, and the cigarette stick 2-11 is kept parallel to the direction of the conveyor belt 5, thereby preventing it from tilting or deviating.
[0032] The specific operation of the separation device 1 is as follows: when the separation sensor detects the passage of the cigarette bar 2-11, the servo motor 1-2 is activated and starts working; if the separation sensor does not detect the passage of the cigarette bar within a certain period of time, the servo motor 1-2 will automatically stop operating to save energy and wait for the next operation command. Compared with a separation device driven by a single motor, this dual-motor drive design is more compact and simplified in structure, making diagnosis and maintenance more convenient and efficient in the event of a fault.
[0033] Specifically, cigarette bar 2-11 has four long faces and two end faces. Considering the length of the long faces, at least two sets of cameras are needed for more comprehensive inspection, with each set capturing half of the surface. The end faces require at least one set of cameras. Therefore, to ensure inspection accuracy, at least eight sets of cameras are used, excluding the bottom face. In this embodiment, eight sets of Ethernet color cameras are used to inspect cigarette bar 2-11.
[0034] Specifically, such as Figure 4 As shown, the detection device 2 includes a housing, a front detection component, an end detection component, eight Ethernet color cameras (first left side camera 2-2, second left side camera 2-3, first top camera 2-4, second top camera 2-5, first right side camera 2-6, second right side camera 2-7, and two end cameras 2-8), eight low-distortion lenses, two sets of white long strip LED light sources, four sets of white short strip LED light sources 2-9, one through-beam laser sensor 2-10, two support plates 2-12, an emergency stop device, and other structural components.
[0035] The emergency stop device is installed on the outside of the housing of the detection device 2, and is located on the side close to the separation device 1. The operator can use this emergency stop device to forcibly intervene in the operation of the motor in order to deal with the damaged tobacco sticks 2-11 in a timely manner.
[0036] The front detection component includes an arched optical path structure 2-1, which spans above the conveyor belt 5. The surface of the arched optical path structure 2-1 facing the conveyor belt 5 is covered with a white matte paint. This design helps to achieve uniform light distribution and avoids the influence of shadows and reflections on the detection results.
[0037] The arched optical path structure 2-1 has two circular holes at the top, approximately 30° above, and approximately 150° above, which are matched with the low-distortion lens. These circular holes provide mounting positions for the low-distortion lens, ensuring that the low-distortion lens can be accurately aligned with the smoke bar 2-11, thereby enabling high-quality image capture.
[0038] Specifically, the low-distortion lenses are mounted on the lens interfaces of the Ethernet color camera, i.e., the Ethernet color camera is mounted on the arched optical path structure 2-1 through the circular holes. Correspondingly, a first top camera 2-4 and a second top camera 2-5 are mounted at the top of the arched optical path structure 2-1; a first left-side camera 2-2 and a second left-side camera 2-3 are mounted at approximately 30° above the arched optical path structure 2-1; and a first right-side camera 2-6 and a second right-side camera 2-7 are mounted at approximately 150° above the arched optical path structure 2-1.
[0039] In other words, the installation position of the Ethernet color camera is carefully designed so that it faces the conveyor belt 5, thereby covering the upper surface of the cigarette sticks 2-11 and their two long sides for comprehensive inspection. In this way, the inspection device 2 can ensure that every part of the cigarette sticks 2-11 can be clearly photographed and inspected during the conveying process, thereby improving the accuracy and efficiency of the inspection.
[0040] The end-face detection components are configured in two sets, respectively positioned opposite each other on both sides of the conveyor belt 5 in the direction of movement. Each set of end-face detection components includes a support plate 2-12. The support plate 2-12 is equipped with a set of upward-facing white strip-shaped LED light sources, which uniformly illuminate the surface of the cigarette stick 2-11 through diffuse reflection from the inner surface of the housing. An end-face camera 2-8 is installed at the center of the support plate 2-12 to capture images of the end face of the cigarette stick 2-11. Short white strip-shaped LED light sources 2-9 are installed on both sides of the end-face camera 2-8, illuminating the end face of the cigarette stick 2-11 at an optimal angle of 45°. A through-beam laser sensor 2-10 is installed between the short white strip-shaped LED light sources 2-9 and the end-face camera 2-8. When the cigarette stick 2-11 moves to a predetermined position, the through-beam laser sensor 2-10 is activated, thereby triggering the Ethernet color camera to capture images.
[0041] Specifically, the detection device 2 only detects five sides of the cigarette bar 2-11, and does not detect its bottom surface. If the bottom needs to be detected, other detection devices can be used, such as a bottom belt with a perforation, or the cigarette bar 2-11 can be flipped over.
[0042] The structure of control cabinet 3 is as follows Figure 5 As shown, the control cabinet 3 is installed below the conveyor belt 5. It includes an external interface, a power switch, a power interface, and a power indicator light. The external interfaces are all led out from both sides of the control cabinet 3. The power switch and the power indicator light are both located on the right side of the control cabinet 3. The power interface is located at the bottom rear side of the control cabinet 3.
[0043] like Figure 5 As shown, the control cabinet 3 also includes an industrial computer 3-1, a control board 3-2, a servo driver 3-3, a power supply module 3-4, and a heat dissipation module 3-5.
[0044] The industrial control computer 3-1 is installed in the lower left corner inside the control cabinet 3. To meet the training and inference requirements of deep learning models, the industrial control computer 3-1 is equipped with a high-performance GPU. The industrial control computer 3-1 has eight PoE interfaces, which can provide power and data communication for eight Ethernet color cameras. Furthermore, the industrial control computer 3-1 is also equipped with two Gigabit Ethernet interfaces to achieve high-speed Ethernet data transmission. In addition, to communicate with the control board 3-2 and the servo motor 1-2, the industrial control computer 3-1 also integrates RS422 and RS232 serial communication interfaces.
[0045] The control board 3-2 includes a control unit, a camera communication interface, a light source communication interface, an I / O interface, and related circuits. It is installed in the upper right corner inside the control cabinet 3, and a servo driver 3-3 is installed on its left side. The control board 3-2 communicates with the industrial computer 3-1 via a serial port and serves the following purposes in the machine vision-based cigarette bar appearance inspection device:
[0046] 1. Control the camera and light source. When the through-beam laser sensor 2-10 detects the smoke bar 2-11, the control board 3-2 will activate the light source and trigger the camera to take a picture.
[0047] 2. Responsible for communication with the electrical cabinet and control of the rejection device 4. The control board 3-2 controls the operation of the rejection cylinder 4-2 based on the calculation results of the industrial computer 3-1, receives the status information of the electrical cabinet, and feeds back the statistical data to the electrical cabinet.
[0048] 3. Adjustment of the start and stop of servo motor 1-2. The control board 3-2 adjusts the start and stop of servo motor 1-2 to achieve linkage and synchronous operation with the entire packaging machine system.
[0049] The power module 3-4 is installed inside the control cabinet 3 on the lower right side, and includes a load disconnect switch, a filter, and a switching power supply. The load disconnect switch serves as the system's main power switch, controlling the connection and disconnection of the external 220V power supply. The filter eliminates noise and interference in the AC power supply, ensuring the stability and purity of the system's power supply. The switching power supply converts the 220V power supply to 24V, providing the necessary power to the industrial computer and control board.
[0050] The heat dissipation modules 3-5 are installed on both sides of the control cabinet 3, and include two sets of fan accessories and two sets of fan assemblies. The fan accessories are auxiliary devices installed on the fan assemblies and primarily serve to protect against dust accumulation. Each set of fan accessories and fan assemblies is installed on both sides of the control cabinet 3; one set is responsible for introducing outside air into the control cabinet 3, while the other set is responsible for expelling hot air from inside the control cabinet 3. This design facilitates air circulation inside the control cabinet 3, thereby achieving cooling and heat dissipation effects.
[0051] The structure of the rejection device 4 is as follows Figure 6 As shown, the rejection device 4 is installed on the right side of the detection device 2, and includes a solenoid valve 4-1, a rejection cylinder 4-2, a fiber optic sensor 4-3, and a rejection frame 4-4. The solenoid valve 4-1 is connected to the rejection cylinder 4-2 via an air pipe.
[0052] In particular, considering the increased demand for air output from the pneumatic system when cigarettes are continuously discarded (chain cigarettes), an air storage tank is installed between the solenoid valve 4-1 and the air pipe to provide additional air supply reserves, thereby maintaining the stable operation of the pneumatic system.
[0053] The rejection cylinder 4-2 includes a cylinder push rod, above which is a protective device to prevent damage during its maximum stroke. This protective device prevents accidental movement of the cylinder push rod, thereby protecting the safety of on-site personnel and avoiding potential injury. Simultaneously, this also helps maintain stable equipment operation and reduces equipment damage or production interruptions caused by misoperation.
[0054] In summary, the machine vision-based cigarette bar appearance inspection device according to the embodiments of this application is described, comprising: a separation device, an inspection device, a control cabinet, a rejection device, and a conveyor belt. The separation device is installed on the left side of the inspection device, and a human-machine interface is installed on a bracket between the separation device and the inspection device. The rejection device is installed on the right side of the inspection device, and the control cabinet is installed below the conveyor belt. This utility model is reasonably designed and easy to install. It utilizes two servo motors to control a synchronous belt to run in opposite directions and uses an Ethernet color camera, combined with an arched white illumination structure, to image the cigarette bar. Simultaneously, a short strip light source illuminates the two end faces of the cigarette bar at a 45° angle, thereby achieving efficient and accurate inspection of the cigarette bar's appearance, improving production quality and efficiency.
[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit of the technical solution of this utility model.
Claims
1. A machine vision-based cigarette stick appearance inspection apparatus, characterized by comprising: The utility model relates to a cigarette end face detection device, including: Detection device (2) and conveyor belt (5); The detection device (2) includes front face detection subassembly and end face detection subassembly, the front face detection subassembly includes arch light path structure (2-1), the arch light path structure (2-1) is across the top of conveyor belt (5), the arch light path structure (2-1) side surface is covered with white matt paint towards conveyor belt (5), a plurality of ethernet color cameras facing conveyor belt (5) are provided on the arch light path structure (2-1), the lens interface of ethernet color camera is provided with low distortion lens; The end face detection subassembly is provided with two groups and is opposite to the both sides of the motion direction of conveyor belt (5) respectively, and each end face detection subassembly includes support plate (2-12), is equipped with a group of white long strip LED light source, a group of end face camera (2-8), two groups of white short strip LED light source (2-9) and opposite laser sensor (2-10) on support plate (2-12), wherein, the end face camera (2-8) is installed at the center position of support plate (2-12), the white short strip LED light source (2-9) is installed at the both sides of end face camera (2-8), and the opposite laser sensor (2-10) is installed between white short strip LED light source (2-9) and end face camera (2-8).
2. The machine vision-based cigarette rod appearance inspection apparatus according to claim 1, characterized in that, The ethernet color camera is first left side face camera (2-2), second left side face camera (2-3), first top camera (2-4), second top camera (2-5), first right side face camera (2-6), second right side face camera (2-7) and two groups of end face camera (2-8) respectively.
3. The machine vision-based cigarette rod appearance inspection apparatus according to claim 2, characterized in that, The best angle of white short strip LED light source (2-9) irradiating the end face of cigarette (2-11) is 45 degrees.
4. The machine vision-based cigarette rod appearance inspection apparatus according to claim 3, characterized in that, Still include separating device (1), the separating device (1) is installed in detection device (2) left side, it includes: separating sensor (1-1), servo motor (1-2), synchronous pulley (1-3) and reduction wheel (1-4), it is through double-shaft servo driver control two servo motor (1-2) drive both sides synchronous belt to carry out reverse operation, to complete the clamping and separating operation of cigarette (2-11).
5. The machine vision-based cigarette rod appearance inspection apparatus according to claim 4, characterized by, The detection device (2) still includes emergency stop device, and the emergency stop device is installed on the outside of the shell of the detection device (2), close to the side of the separating device (1).
6. The machine vision-based cigarette rod appearance inspection apparatus according to claim 3, characterized by, Still include control cabinet (3), the control cabinet (3) is installed below conveyor belt (5), and it includes external interface, power switch, power interface and power indicator, wherein, the external interface is led out from the both sides of control cabinet (3), the power switch and the power indicator are located at the right side of control cabinet (3), and the power interface is located at the bottom of the back side of control cabinet (3).
7. The machine vision-based cigarette rod appearance inspection apparatus according to claim 6, characterized by, The control cabinet (3) still includes industrial computer (3-1), control panel (3-2), servo driver (3-3), power module (3-4); The industrial computer (3-1) is installed at the lower left inside the control cabinet (3), and is provided with 8 groups of POE interfaces, 2 groups of gigabit Ethernet interfaces, and RS422 and RS232 serial communication interfaces; The control board (3-2) is installed at the upper right inside the control cabinet (3), and includes a control unit, a camera communication interface, a light source communication interface, and an I / O interface; The servo driver (3-3) is located at the left side of the control board (3-2); The power module (3-4) is installed at the lower right inside the control cabinet (3), and includes a load isolation switch, a filter, and a switching power supply, wherein the switching power supply converts 220V power into 24V power.
8. The machine vision-based cigarette rod appearance inspection apparatus according to claim 7, characterized in that, A set of heat dissipation modules (3-5) are installed on both sides of the control cabinet (3), and each set of heat dissipation modules (3-5) includes 2 groups of fan accessories and 2 groups of fan assemblies, each of which is installed on the two sides of the control cabinet (3), one set of fan assemblies blows external air into the control cabinet (3), and the other set of fan assemblies blows internal hot air out of the control cabinet (3). 9.The machine vision based detection device of appearance of a tobacco rod according to claim 3, wherein, It also includes a rejection device (4) installed on the right side of the detection device (2), which includes a solenoid valve (4-1), a rejection cylinder (4-2), an optical fiber sensor (4-3), and a rejection frame (4-4), wherein the solenoid valve (4-1) is connected to the rejection cylinder (4-2) through an air pipe, and a gas storage tank is installed between the solenoid valve (4-1) and the air pipe.
10. The machine vision-based cigarette rod appearance inspection apparatus according to claim 9, characterized in that, The rejection cylinder (4-2) includes a cylinder push rod, and above the cylinder push rod, a protection device is provided to protect it from damage at maximum stroke.