Appearance detection system and detection method for medium-branch moisture retention bag

Abstract

The invention discloses an appearance detection system and a detection method for a middle-branch moisture-retaining bag, and the main design concept of the appearance detection system is that six cameras aiming at the shape of a small bag are configured, two belts with an interval are used for horizontally conveying the cigarette bag, the bottom of the cigarette bag is exposed to the maximum extent, and six-surface detection of the small bag is realized; through multi-angle dome illumination light supplement, uniform light supplement for the moisture retention bag is realized, and the detection accuracy of fine defects is improved; in addition, the rotating speed of the sub-packaging device and the sub-packaging motor can be adjusted so as to adapt to different requirements and production speeds, it can be effectively guaranteed that only a single packaged cigarette is shot each time, and the sub-packaging device can evenly sub-package the cigarette packets while it is guaranteed that the cigarette packets are not excessively extruded. Therefore, the effects of flat cigarette packet conveying and six-surface visual reliable imaging detection are achieved.

Description

Technical Field

[0001] The invention relates to the field of cigarette manufacturing, and in particular to a system and method for detecting the appearance of a medium-sized moisturizing pack. Background Art

[0002] In recent years, in order to improve product process control capabilities and further promote high-quality manufacturing, visual inspection technology has been widely used in the field of cigarette manufacturing. Especially in the inspection of small-box cigarette packs, it is widely used. The small-pack appearance inspection device is generally installed on the exit channel of the small-box packaging machine and is implemented using the original machine's cigarette pack transportation channel.

[0003] To elaborate, the existing visual imaging inspection of finished cigarettes, collectively referred to as small package appearance inspection in the industry, mainly takes photos of finished small packages that have been packaged with small box trademark paper. The specific method is to install an imaging inspection system on the cigarette package conveying channel at the exit of the small box packaging machine. When the equipment is running, the cigarette package stands on its side on the conveyor belt, and the conveyor belt conveys the cigarette package sideways through friction. The Baorun Pack appearance inspection takes photos of the upper side, front large surface, rear large surface, left bottom surface, and right bottom surface of the small box cigarette package that is conveyed sideways (the lower side is in contact with the transport belt and cannot be inspected). That is, the existing technology mainly inspects sideways cigarette packs, and the inspection surfaces are five sides, and there is no solution for full six-sided appearance inspection of moisturizing packs; furthermore, in the currently used visual inspection solutions, the lighting mechanism for improving the clarity of photos will lead to uneven exposure, and thus fail to obtain ideal imaging effects; in addition, before the cigarette packs enter the inspection device, they are usually divided into packages by clamping the cigarette packs with two upright conveyor belts. Since the packaging material of the moisturizing packs is relatively soft, this method of using belts to clamp and convey may cause the cigarette packs to deform, affecting product quality.

[0004] To summarize:

[0005] (1) The existing appearance inspection of moisturizing packs only inspects five sides. The width of the conveyor belt is greater than the width of the cigarette pack, and the lower side is in contact with the conveyor belt. If quality defects occur on the lower side of the cigarette pack, the existing appearance inspection scheme for moisturizing packs cannot reliably detect them.

[0006] (2) The existing appearance inspection of moisturizing packs uses a strip light source for illumination, and the LED light source irradiates from the same direction, which often causes part of the collected cigarette package image to be overexposed and the other part to be underexposed, thereby affecting the detection accuracy.

[0007] (3) Before the cigarette packs enter the detection device, they are divided into packages by clamping them with a vertical conveyor belt, which will deform the cigarette packs and affect product quality. Summary of the invention

[0008] In view of the above, the present invention aims to provide a medium-sized moisturizing bag appearance inspection system and inspection method to solve the above-mentioned technical problems.

[0009] The technical solution adopted by the present invention is as follows:

[0010] In the first aspect, the present invention provides a system for detecting the appearance of a medium-sized moisturizing bag, comprising:

[0011] Subpackaging trigger optical fiber, photo trigger optical fiber, rejection trigger optical fiber, outlet blockage detection optical fiber, subpackaging device, subpackaging motor, front fill light device, front detection camera, rear fill light device, rear detection camera, upper fill light device, upper detection camera, lower fill light device, lower detection camera, upper left detection camera, upper right detection camera, rejection device and conveyor belt;

[0012] The conveyor belt is composed of two belts arranged horizontally and in parallel, used to horizontally support the largest side of the cigarette pack, and the two belts have a preset spacing;

[0013] The sub-packaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are arranged in sequence according to the conveying direction, and are installed in the middle channel of the two belts through a fixed bracket, and are in an up-down shooting mode;

[0014] The packing motor is connected to the packing device via a pulley and a toothed belt to provide packing power for the packing device, and the packing device is used to separate adjacent cigarette packs being transported by a predetermined distance;

[0015] The front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device correspond to the four sides of the cigarette package respectively, and are installed around the conveying belt behind the subpackaging device according to the conveying direction;

[0016] The six detection cameras are respectively arranged corresponding to the six sides of the cigarette package, and the front detection camera, the rear detection camera, the upper detection camera, and the lower detection camera are respectively connected to the front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device;

[0017] The rejection device is installed behind the detection camera according to the conveying direction;

[0018] The subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber and the outlet blockage detection optical fiber are respectively associated with each fill light device, each detection camera, the subpackaging motor and the rejection device electrical signal.

[0019] In at least one possible implementation, each fill light device has a bowl-shaped semicircular structure, specifically comprising: a circular fill light cover and a circular LED light facing the inner wall of the circular fill light cover;

[0020] The inner wall surface of the circular fill light cover is set to a white frosted rough surface, which is used to form diffuse reflection inside the entire fill light device.

[0021] In at least one possible implementation, the distance between the central axes of the two conveyor belts is equal to half the length of the long side of the cigarette pack.

[0022] In at least one possible implementation, the packing motor has a variable speed and / or direction function, which is used to change the passing speed of the cigarette packs.

[0023] In at least one possible implementation, the detection system further includes a trigger board, and the sub-packaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are respectively connected to the trigger board signal;

[0024] The trigger board has at least three signal transmission paths:

[0025] The first path is connected to each detection camera and each fill light device;

[0026] The second route is connected to the host computer signal through the I / O interface board;

[0027] The third route is connected to the PLC and is used to control the actions of the conveyor belt, the rejecting device, and the sub-packaging motor.

[0028] In at least one possible implementation manner, the host computer is respectively connected to the PLC and each detection camera via electrical signals.

[0029] In at least one possible implementation, the rejecting device includes a rejecting solenoid valve, a rejecting cylinder, and a rejecting nozzle, and the rejecting solenoid valve is connected to the PLC electrical signal.

[0030] In at least one possible implementation manner, strip-shaped fill lights are respectively disposed below the upper left detection camera and the upper right detection camera.

[0031] In at least one possible implementation, the detection system further includes two semi-arc-shaped mounting brackets, each of which is used to mount three detection cameras.

[0032] In a second aspect, the present invention provides a method for detecting the appearance of a medium-sized moisturizing bag, comprising:

[0033] The outlet blockage detection optical fiber determines whether the outlet of the conveying channel is blocked;

[0034] After confirming that the outlet is not blocked, the conveyor belt is driven to transport the cigarette pack from the entrance of the conveyor channel to the photo detection area;

[0035] When the cigarette pack is transported to the packing trigger optical fiber, the packing motor is controlled to run according to the feedback signal of the packing trigger optical fiber, and the packing device is brought to separate the adjacent cigarette packs;

[0036] When the cigarette pack is transported to the photo trigger optical fiber, each fill light device is triggered to light up, and each detection camera is triggered to take a photo;

[0037] Determine whether there are defects on the appearance of the cigarette package based on the pictures taken by each detection camera;

[0038] If there is a defect, when the defective cigarette package arrives, the rejection trigger optical fiber feedback controls the rejection device to operate and reject the defective cigarette package from the conveyor belt.

[0039] Compared with the prior art, the main design concept of the present invention is that six cameras are configured for the appearance of small packages, and two belts with spacing are used to horizontally convey cigarette packages, so as to expose the bottom of the cigarette packages to the maximum extent and realize six-sided detection of small packages; and through multi-angle dome lighting fill light, uniform fill light is realized for the moisturizing package, which is conducive to improving the detection accuracy of subtle defects; in addition, the provided subpackaging device and subpackaging motor can adjust the speed to adapt to different needs and production speeds, which can effectively ensure that only a single pack of cigarettes is photographed each time, and the subpackaging device can ensure that the cigarette packages are not over-squeezed while uniformly subpackaging the cigarette packages. Therefore, the present invention realizes the effect of flat-pack conveying cigarette packages and completing six-sided visual reliable imaging detection.

[0040] Furthermore, the present invention realizes multi-path branching of control signals with a trigger board, and the signals are not processed by a PLC, which can minimize the trigger delay and provide more sufficient time for defect identification and shift elimination processing.

[0041] Furthermore, the I / O interface board of the present invention can convert the 24V control signal sent by the trigger board into a 5V or 12V signal recognizable by the host computer, thereby realizing effective information interaction between the control system and the host computer IO signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0043] Figure 1 A hardware schematic diagram of a system for inspecting the appearance of a medium-sized moisturizing bag provided by an embodiment of the present invention;

[0044] Figure 2 An electrical block diagram of a system for inspecting the appearance of a medium-sized moisturizing bag provided by an embodiment of the present invention;

[0045] Figure 3A schematic flow chart of a method for inspecting the appearance of a medium-sized moisturizing bag provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0047] The present invention proposes an embodiment of a system for detecting the appearance of a medium-sized moisturizing bag. Specifically, Figure 1 As shown, it includes: a subpackaging trigger optical fiber 1, a photographing trigger optical fiber 2, a rejection trigger optical fiber 3, an outlet blockage detection optical fiber 4, a subpackaging device 5, a subpackaging motor 6, a front fill light device 7, a front detection camera 8, a rear fill light device 9, a rear detection camera 10, an upper fill light device 11, an upper detection camera 12, a lower fill light device 13, a lower detection camera 14, an upper left detection camera 15, an upper right detection camera 16, a rejection device 18 and a conveyor belt 19;

[0048] The conveying belt 19 can be composed of two 10 mm wide rubber belts arranged horizontally and in parallel, used to horizontally support the largest side of the cigarette pack, and the two belts have a preset spacing. Preferably, the spacing between the two belts is adjustable, for example, the two belts are in contact with the left quarter and the right quarter of the lower side of the cigarette pack, respectively, so that while ensuring the stable conveyance of the cigarette pack, the corners of the cigarette pack and most of the lower side area can be leaked, thereby minimizing the shielding of the lower side of the cigarette pack by the belt.

[0049] The subpackaging trigger optical fiber 1, the photographing trigger optical fiber 2, the rejection trigger optical fiber 3, and the outlet blockage detection optical fiber 4 are arranged in sequence according to the conveying direction shown in the figure. Specifically, the subpackaging trigger optical fiber 1 can be arranged at a preset distance in front of the subpackaging device 5, the photographing trigger optical fiber 2 can be arranged behind the subpackaging device 5 and close to the camera area, the rejection trigger optical fiber 3 can be arranged at the conveying channel behind the photographing area (predetermined rejection position), and the outlet blockage detection optical fiber 4 can be arranged at the end outlet of the conveying belt 19. In actual operation, the above four groups of optical fibers can be installed in the middle channel of the two conveying belts 19 by fixing the bracket, and adopting the up-down shooting mode. More preferably, a convex lens is installed on the optical fiber probe to focus the infrared light emitted by the optical fiber to a spot diameter less than 6mm, so that the position deviation of the cigarette package is less than 2mm at each triggering.

[0050] Next, the sub-packaging device 5 is installed on a moist pack appearance inspection base (not shown in the figure). When the moist pack reaches the sub-packaging device 5, the sub-packaging device separates the continuously transported cigarette packs by a predetermined distance, thereby ensuring that only a single pack of cigarettes is photographed each time during subsequent photo inspection to avoid interference from the front and rear cigarette packs.

[0051] The subpackaging motor 6 is connected to the subpackaging device through a pulley and a toothed belt, providing subpackaging power for the subpackaging device 5 and regulating the subpackaging effect through the motor speed. Specifically, the subpackaging device 5 may include a clamping mechanism, and through the speed and steering control of the subpackaging motor 6, the effect of easing clamping and rapid release can be achieved, which can not only avoid damage to the cigarette package, but also ensure the efficiency of continuous detection. In other embodiments, as shown in the figure, the subpackaging device 5 can be a roller group located on the side of the transported cigarette package. The roller group driven by the subpackaging motor is in friction contact with multiple sides of the cigarette package to achieve the effect of changing the cigarette package conveying speed, so as to achieve the purpose of separating adjacent cigarette packages at a certain distance. For example, the rotation speed of the roller group is significantly lower than the speed of the conveying belt, so that the cigarette package passing through here is decelerated.

[0052] Continuing from the above, the front fill light device 7, the rear fill light device 9, the upper fill light device 11, and the lower fill light device 13 correspond to the front, rear, upper, and lower sides of the cigarette pack, respectively, and are installed at the conveying belt 19 behind the subpackaging device 5 according to the conveying direction;

[0053] The above-mentioned fill-light device has a bowl-shaped semicircular structure, and may specifically include a circular fill-light cover and a ring-shaped LED light facing the circular fill-light cover. The light emitted by the LED does not directly illuminate the cigarette pack, but illuminates the circular fill-light cover and is reflected back through the fill-light cover. More preferably, the inner reflective surface of the circular fill-light cover is a white frosted rough surface, and the light shines on it to form diffuse reflection, and uniform light covers the entire interior of the fill-light device, thereby uniformly filling the entire plane of the cigarette pack.

[0054] The front detection camera 8, the rear detection camera 10, the upper detection camera 12, the lower detection camera 14, the upper left detection camera 15, and the upper right detection camera 16 are respectively arranged corresponding to the six sides of the cigarette package, and the front detection camera 8, the rear detection camera 10, the upper detection camera 12, and the lower detection camera 14 are respectively connected to the front fill light device 7, the rear fill light device 9, the upper fill light device 11, and the lower fill light device 13. For example, a camera through hole is provided on the top of the bowl-shaped semicircular fill light cover, and the present invention does not limit this. It can be explained that since the upper left detection camera 15 and the upper right detection camera 16 are located on the detection channel and it is inconvenient to install the aforementioned fill light device in space, in other preferred embodiments of the present invention, strip-shaped fill lights can be added to the lower parts of the two cameras of the upper left detection camera and the upper right detection camera according to the needs of on-site imaging, so as to realize fill light for the left front and right front sides of the cigarette package.

[0055] It can also be explained that the installation method of the aforementioned camera can be achieved through a semi-arc-shaped mounting bracket 17. For example, the mounting bracket 17 can be fixed to a small package appearance inspection base (not shown in the figure) by a screw, and as shown in the figure, three cameras can be installed on each mounting bracket 17 (the other mounting bracket 17 is not shown).

[0056] The rejection device 18 is installed behind the camera according to the conveying direction. Specifically, it can be composed of a rejection solenoid valve, a rejection cylinder, and a rejection nozzle. When the cigarette package is judged to be defective and reaches the rejection position, the rejection device 18 is triggered to reject the defective cigarette package on the channel.

[0057] The subpackaging trigger optical fiber 1, the photographing trigger optical fiber 2, the rejection trigger optical fiber 3 and the outlet blockage detection optical fiber 4 are respectively associated with electrical signals of each fill light device, each detection camera, the subpackaging motor and the rejection device.

[0058] Here we provide Figure 2 The electrical connection block diagram example of the appearance inspection system of the medium-sized moisturizing bag shown in the figure is only an implementation diagram, not a limitation, in which the signals detected by the trigger optical fiber 1, the photo trigger optical fiber 2, the rejection trigger optical fiber 3, and the outlet blockage detection optical fiber 4 are transmitted to the trigger board (which can be understood as a signal conversion and distribution circuit module), and the trigger board divides the signal into three paths:

[0059] The first route is directly transmitted to all cameras and fill light devices. While controlling the fill light device to get power to fill light, it triggers the camera to take pictures, thereby reducing the trigger delay of taking pictures and fill light, and ensuring that fill light and taking pictures are carried out synchronously. Among them, the signal that triggers taking pictures can be converted into 12V through the trigger board, and the voltage of the fill light is 24V.

[0060] In the second path, the trigger board forwards the signal to the I / O interface board, which processes the signal into a 5V or 12V signal that can be received by the host computer and transmits it to the host computer, which completes the trigger counting, fault detection and other processing.

[0061] The third way is that the trigger board transmits the signal directly to the PLC (such as Beckhoff) for controlling the conveyor belt, rejection device, and subcontracting motor.

[0062] And, in the above Figure 2 Based on the schematic electrical framework, the host computer can be connected to the PLC and the electrical signals of each detection camera respectively. In actual operation, the detection camera and the host computer can be connected via Ethernet, and the PLC and the host computer can be connected via a TwinCAT3 network cable.

[0063] Based on this electrical framework, functions such as parameter downloading and photo uploading can be realized between the detection camera and the host computer. For example, the cigarette package can be photographed by the detection camera, and the cigarette package image is transmitted to the host computer. The host computer performs defect detection through a preset appearance image detection algorithm. When defects are detected in the current cigarette package image, an NG signal can be sent out and transmitted to the PLC through the network cable. After receiving the cigarette package defect signal, the PLC can control the rejection solenoid valve to be energized, and then control the action of the rejection cylinder to reject the corresponding cigarette package.

[0064] Finally, based on the above system embodiment, the present invention combines Figure 3 A method flow for the appearance inspection of a medium-sized moisturizing bag is provided:

[0065] After the equipment is running, the outlet blockage detection optical fiber 4 determines whether the outlet is blocked. When the outlet is blocked, the conveying belt and the sub-packaging motor are not started.

[0066] When the outlet is not blocked, the conveyor belt is driven to operate, and the cigarette packs are transported from the conveyor belt to the Figure 1 As shown, the cigarette packet is transported from the left side to the right side. When the cigarette packet first reaches the packet-triggered optical fiber, the packet-triggered photoelectric probe transmits the signal of the cigarette packet existence to the PLC.

[0067] The PLC output signal controls the start of the packing motor. When the cigarette pack reaches the packing device, since the speed of the packing device is lower than that of the conveyor belt, the cigarette pack undergoes a process of first deceleration and then acceleration, thereby achieving a distance between the cigarette packs passing through the packing device and the adjacent conveyed cigarette packs, making it convenient to only take pictures of one pack of cigarettes each time.

[0068] After passing through the packing device, when the cigarette pack reaches the position of the photo-triggering photoelectric sensor, the sensor transmits the cigarette pack presence signal to the trigger board. The trigger board outputs a control signal to control the upper, lower, front, rear, left front, and right front fill lights to light up the cigarette pack; at the same time, the output signal controls the six detection cameras to take pictures.

[0069] After taking the photo, the detection camera can transmit the picture to the host computer via Ethernet. The host computer determines whether the cigarette package is defective through the established cigarette package appearance detection algorithm. When the cigarette package is normal, no processing is done; when the cigarette package image is characterized as a defect, the host computer outputs a signal to the PLC, the PLC receives the defect signal and determines through optical fiber whether the cigarette package has reached the rejection position. When the rejection detection photoelectric sensor detects that the defective cigarette package has arrived, the cigarette package arrival signal is transmitted to the PLC, and the PLC immediately outputs a signal to control the solenoid valve of the rejection device to connect the high-pressure air and reject the cigarette package.

[0070] In summary, the main design concept of the present invention is that six cameras are configured for the appearance of small packages, and two belts with spacing are used to horizontally convey cigarette packages, so as to expose the bottom of the cigarette packages to the maximum extent and realize six-sided detection of small packages; and through multi-angle dome lighting fill light, uniform fill light is realized for the moisturizing package, which is conducive to improving the detection accuracy of subtle defects; in addition, the provided subpackaging device and subpackaging motor can adjust the speed to adapt to different needs and production speeds, which can effectively ensure that only a single pack of cigarettes is photographed each time, and the subpackaging device can ensure that the cigarette packages are not over-squeezed while uniformly subpackaging the cigarette packages. As a result, the present invention achieves the effect of flat-pack conveying cigarette packages and completing six-sided visual reliable imaging detection.

[0071] If the expressions expressing orientation are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0072] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A system for detecting the appearance of a medium-sized moisturizing bag, characterized in that: include: Subpackaging trigger optical fiber, photo trigger optical fiber, rejection trigger optical fiber, outlet blockage detection optical fiber, subpackaging device, subpackaging motor, front fill light device, front detection camera, rear fill light device, rear detection camera, upper fill light device, upper detection camera, lower fill light device, lower detection camera, upper left detection camera, upper right detection camera, rejection device and conveyor belt; The conveyor belt is composed of two belts arranged horizontally and in parallel, used to horizontally support the largest side of the cigarette pack, and the two belts have a preset spacing; The sub-packaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber, and the outlet blockage detection optical fiber are arranged in sequence according to the conveying direction, and are installed in the middle channel of the two belts through a fixed bracket, and are in an up-down shooting mode; The packing motor is connected to the packing device via a pulley and a toothed belt to provide packing power for the packing device, and the packing device is used to separate adjacent cigarette packs being transported by a predetermined distance; The front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device correspond to the four sides of the cigarette package respectively, and are installed around the conveying belt behind the subpackaging device according to the conveying direction; The six detection cameras are respectively arranged corresponding to the six sides of the cigarette package, and the front detection camera, the rear detection camera, the upper detection camera, and the lower detection camera are respectively connected to the front fill light device, the rear fill light device, the upper fill light device, and the lower fill light device; The rejection device is installed behind the detection camera according to the conveying direction; The subpackaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber and the outlet blockage detection optical fiber are respectively associated with each fill light device, each detection camera, the subpackaging motor and the rejection device electrical signal.

2. The appearance inspection system for the medium-sized branch moistening bag according to claim 1 is characterized in that: Each fill light device has a bowl-shaped semicircular structure, specifically comprising: a circular fill light cover and a circular LED light facing the inner wall of the circular fill light cover; The inner wall surface of the circular fill light cover is set to a white frosted rough surface, which is used to form diffuse reflection inside the entire fill light device.

3. The appearance inspection system for the medium-sized branch moistening bag according to claim 1 is characterized in that: The distance between the two belt center axes of the conveyor belt is equal to half of the length of the long side of the cigarette package.

4. The appearance inspection system for the medium-sized branch moistening bag according to claim 1 is characterized in that: The packing motor has a variable speed and / or direction of rotation, and is used to change the passing speed of the cigarette packs.

5. The appearance inspection system for the medium-sized branch moistening bag according to claim 1 is characterized in that: The detection system further comprises a trigger board, and the sub-packaging trigger optical fiber, the photographing trigger optical fiber, the rejection trigger optical fiber and the outlet blockage detection optical fiber are respectively connected to the trigger board signal; The trigger board has at least three signal transmission paths: The first path is connected to each detection camera and each fill light device; The second route is connected to the host computer signal through the I / O interface board; The third route is connected to the PLC and is used to control the actions of the conveyor belt, the rejecting device, and the sub-packaging motor.

6. The appearance inspection system for the medium-sized branch moistening bag according to claim 5 is characterized in that: The host computer is respectively connected to the PLC and each detection camera by electrical signals.

7. The appearance inspection system for the medium-sized branch moistening bag according to claim 5 is characterized in that: The rejecting device comprises a rejecting solenoid valve, a rejecting cylinder and a rejecting nozzle, and the rejecting solenoid valve is connected to the PLC electrical signal.

8. The appearance inspection system for the medium-sized branch moisturizing bag according to any one of claims 1 to 7, characterized in that: Strip-shaped fill lights are respectively arranged at the lower parts of the upper left detection camera and the upper right detection camera.

9. The appearance inspection system for the medium-sized branch moisturizing bag according to any one of claims 1 to 7, characterized in that: The detection system also includes two semi-arc-shaped mounting brackets, each of which is used to install three detection cameras.

10. A method for detecting the appearance of a medium-sized moisturizing bag, characterized in that: include: The outlet blockage detection optical fiber determines whether the outlet of the conveying channel is blocked; After confirming that the outlet is not blocked, the conveyor belt is driven to transport the cigarette pack from the entrance of the conveyor channel to the photo detection area; When the cigarette pack is transported to the packing trigger optical fiber, the packing motor is controlled to run according to the feedback signal of the packing trigger optical fiber, and the packing device is brought to separate the adjacent cigarette packs; When the cigarette pack is transported to the photo trigger optical fiber, each fill light device is triggered to light up, and each detection camera is triggered to take a photo; Determine whether there are defects on the appearance of the cigarette package based on the pictures taken by each detection camera; If there is a defect, when the defective cigarette package arrives, the rejection trigger optical fiber feedback controls the rejection device to operate and reject the defective cigarette package from the conveyor belt.

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