Hard box medium-branch packet appearance detection system and detection method

Abstract

The invention discloses a hard box medium-branch packet appearance detection system and detection method, and the main design conception of the system is that the appearance of a hard box packet is photographed in all directions at two stations through two processes of horizontal conveying and side conveying, so that the visual detection of six surfaces and a drawstring of the packet can be realized; in particular, photographing detection on the left side face, the right side face, the rear side face, the front side face and the upper side face is completed on a first detection station of a horizontal conveying belt, then detection on the lower side face and side face pulling belts of the cigarette packets is completed on a second station of a side face conveying belt, then defective cigarette packets are removed on an outlet conveying belt, and defective products are effectively prevented from flowing into the next procedure. According to the invention, the three groups of belts are utilized to respectively realize all-directional visual inspection and defective product removal, so that the quality of hard package small box products is effectively controlled while the appearance inspection effect is ensured.

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 small cigarette packs in a hard box. 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 finished hard-pack cigarette packages.

[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 and inspects the 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 on its side through friction. The small package appearance inspection takes photos and inspects 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 the cigarette packages that stand on their side, and the inspection surfaces are five surfaces. There is no solution for the appearance inspection of the six-sided moisturizing package.

[0004] That is, the existing small package appearance inspection only inspects five sides, and the lower side is in contact with the conveyor belt. If quality defects occur on the lower side of the cigarette package, the existing small package appearance inspection solution cannot reliably detect them. Summary of the invention

[0005] In view of the above, the present invention aims to provide a system and method for detecting the appearance of small packages in a hard box to solve the technical problems mentioned above.

[0006] The technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a system for detecting the appearance of a small package in a hard box, comprising:

[0008] A horizontal conveyor belt, a subpackaging device for spacing adjacent cigarette packs, a first cigarette pack detection optical fiber arranged before the subpackaging device, and a first detection station located after the subpackaging device, wherein the first detection station is provided with a second cigarette pack detection optical fiber and a first visual detection device;

[0009] A second inspection station is connected after the first inspection station, and the second inspection station specifically includes: a side conveying belt, a cigarette pack conveying wire for supporting the cigarette pack, a third cigarette pack inspection optical fiber, and a second visual inspection device;

[0010] An outlet conveyor belt is connected after the second inspection station, a fourth cigarette pack inspection optical fiber is provided at a position of the outlet conveyor belt close to the second inspection station, a rejection device is provided after the fourth cigarette pack inspection optical fiber, and a fifth cigarette pack inspection optical fiber is provided after the rejection device;

[0011] The second cigarette pack detection optical fiber and the third cigarette pack detection optical fiber are associated with the electrical signals of each visual detection device; the first cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber are associated with the packing device, the rejection device, and the electrical signals of each conveyor belt.

[0012] In at least one possible implementation, the first cigarette pack detection optical fiber, the second cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber use horizontal opposing optical fibers and are installed on the left and right sides of the conveyor belt; the third cigarette pack detection optical fiber uses top-bottom opposing optical fibers and is installed on the top and bottom sides of the conveyor belt.

[0013] In at least one possible implementation manner, the horizontal conveying belt and the side conveying belt are powered by a first conveying motor, and the outlet conveying belt is driven by a second conveying motor.

[0014] In at least one possible implementation, the packing device decelerates the passing cigarette packs by means of a clamping mechanism or a roller group located on the side of the cigarette packs.

[0015] In at least one possible implementation, the detection system further includes a PLC;

[0016] The signals detected by the second cigarette pack detection optical fiber and the third cigarette pack detection optical fiber are divided into two paths through the trigger board: the first path is sent to each visual detection device; the second path is transmitted to the PLC;

[0017] The first cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber are directly connected to the PLC signal and are used to control the conveyor belt, the packaging device, and the rejection device.

[0018] In at least one possible implementation, the detection system further includes an industrial computer, a touch screen, and a warning light;

[0019] The industrial computer is respectively connected to the touch screen, the PLC, and each visual detection device by electrical signals; the warning light is connected to the PLC.

[0020] In at least one possible implementation, the first visual inspection device includes: a left inspection component, a right inspection component, a rear inspection component, a front inspection component, and an upper inspection component respectively mounted on the left side, the right side, the rear side, the front side, and the front upper side of the first inspection station through a mounting bracket;

[0021] The second visual inspection device comprises: a lower inspection component and a drawstring inspection component respectively installed below and in front of the second inspection station through an installation bracket;

[0022] Each detection component specifically includes: a detection camera and a fill light.

[0023] In at least one possible implementation, the rejecting device includes: a rejecting solenoid valve, a rejecting high-pressure nozzle, and a collection box disposed on one side of the rejecting station.

[0024] In a second aspect, the present invention provides a method for detecting the appearance of a small package in a hard box, comprising:

[0025] When the first cigarette pack detection optical fiber detects the cigarette pack, the conveyor belt and the packing device are started

[0026] When the second cigarette pack detection optical fiber detects the cigarette pack, the visual detection device of the first detection station is triggered to take a photo and upload the image;

[0027] When the third cigarette pack detection optical fiber detects the cigarette pack, the visual detection device of the second detection station is triggered to take a photo and upload the image;

[0028] After processing the uploaded image, the processing result signal is stored at the end of the preset detection result queue;

[0029] When the fourth cigarette packet detection optical fiber detects a cigarette packet, a detection result is taken from the head of the detection result queue and it is determined whether it is an abnormal result;

[0030] If it is abnormal, the rejection device is triggered to act;

[0031] When the fifth cigarette packet detection optical fiber detects the cigarette packet, it is determined that the cigarette packet appearance detection is completed.

[0032] In at least one possible implementation, the detection method further includes, when the fifth cigarette packet detection optical fiber detects the cigarette packet, determining whether the rejection action is effective:

[0033] When the rejection device is triggered to act, a preset rejection timer is triggered;

[0034] Calculate the transportation time Δt of the cigarette package from the fourth cigarette package detection optical fiber to the fifth cigarette package detection optical fiber according to the conveyor belt speed and the distance between the fourth cigarette package detection optical fiber and the fifth cigarette package detection optical fiber;

[0035] When the fifth cigarette packet detection optical fiber detects a cigarette packet, if the timing of the rejection timer is between 0.7Δt and 1.2Δt, it is determined that the cigarette packet rejection fails.

[0036] Compared with the prior art, the main design concept of the present invention is that through the two processes of horizontal conveying and side conveying, the appearance of the hard box small package is photographed in all directions at two stations, that is, the visual inspection of the six sides and the drawstring of the small package can be realized. Specifically, the photographic inspection of the five sides, namely the left, right, back, front and top, is completed at the first inspection station of the horizontal conveying belt, and then the inspection of the lower side of the cigarette package and the side drawstring is completed at the second station of the side conveying belt. After that, the defective cigarette package is removed on the outlet conveying belt, effectively preventing the defective products from flowing into the next process. The present invention uses three groups of belts to respectively realize all-round visual inspection and defective product removal, effectively controlling the quality of the hard pack small box products while ensuring the appearance inspection effect.

[0037] Furthermore, in some embodiments of the present invention, a test result queue is established to store the results, and the defective small cigarette packs are accurately shifted and removed through the test result queue "first in, first out" storage and deletion mechanism, thereby effectively ensuring product quality;

[0038] Furthermore, in some other embodiments of the present invention, the conveying time is calculated by the speed of the conveying belt and the distance between the two detection points, and based on the timing when the rejection is triggered and the conveying time, it is determined whether the defective cigarette packs are effectively rejected. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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:

[0040] Figure 1 A schematic diagram of a system for inspecting the appearance of a small package in a hard box provided by an embodiment of the present invention;

[0041] Figure 2 An electrical block diagram of a small package appearance inspection system in a hard box provided by an embodiment of the present invention;

[0042] Figure 3 A flow chart of a method for detecting the appearance of a small packet in a hard box provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] The present invention proposes an embodiment of a system for inspecting the appearance of a small package in a hard box. Specifically, Figure 1 As shown, it includes: a horizontal conveyor belt 1, a subpackaging device 3 for spacing adjacent cigarette packets, a first cigarette packet detection optical fiber 2 arranged before the subpackaging device 3 (relative to the conveying direction), and a first detection station located after the subpackaging device 3 (relative to the conveying direction). A second cigarette packet detection optical fiber 4 and a first visual detection device are arranged at the first detection station. In actual operation, the existing small packet detection scheme can be referred to. The first visual detection device specifically includes a left detection component 5, a right detection component 6, a rear detection component 7, a front detection component 8, and an upper detection component 9, and can be installed in the left, right, rear, front, and upper directions of the first detection station through a mounting bracket. Each detection component is preferably composed of a detection camera and a fill light. When the cigarette packet arrives at the first detection station, the fill light is triggered and the five sides of the cigarette packet are photographed for detection.

[0045] Continuing from the above, a second inspection station is connected after the first inspection station, and the second inspection station specifically includes: a side conveying belt 12, a cigarette pack conveying wire 11 for supporting cigarette packs, a third cigarette pack detection optical fiber 10 and a second visual inspection device, and the second visual inspection device specifically includes a lower detection component 13 and a drawstring detection component 14. Specifically, the lower detection component 13 and the drawstring detection component 14 can be installed at the lower and front lower positions of the second inspection station through a mounting bracket. Similarly, each detection component is preferably composed of a detection camera and a fill light, and when the cigarette pack arrives at the second inspection station, the fill light is triggered and the lower side and the drawstring of the cigarette pack are photographed for inspection.

[0046] An outlet conveyor belt 15 is connected after the second inspection station, and a fourth cigarette pack inspection optical fiber 16 is provided at a position of the outlet conveyor belt 15 near the second inspection station, and a rejection device is provided after the fourth cigarette pack inspection optical fiber 16 (relative to the conveying direction). It can be understood that in some embodiments of the present invention, the rejection device may specifically include: a rejection solenoid valve 17 and a rejection high-pressure nozzle 18. When the cigarette pack needs to be rejected, the rejection solenoid valve 17 is turned on to control high-pressure air to be ejected from the rejection high-pressure nozzle 18 to blow the cigarette pack off the conveyor belt (which may fall into the collection box provided at the rejection station); then, a fifth cigarette pack inspection optical fiber 19 is provided after the rejection device (relative to the conveying direction).

[0047] The first cigarette package detection optical fiber 2, the second cigarette package detection optical fiber 4, the fourth cigarette package detection optical fiber 16, and the fifth cigarette package detection optical fiber 19 can all be installed on the left and right sides of the forward direction of the small package appearance detection through a bracket, that is, they are set as horizontal opposing optical fibers; the third cigarette package detection optical fiber 10 is installed on the upper and lower sides of the forward direction of the small package appearance detection through a bracket, that is, it is set as an upper and lower opposing optical fiber.

[0048] In order to reliably realize double-station detection and subsequent rejection operations, the horizontal conveyor belt 1 and the side conveyor belt 12 are powered by a first conveyor motor (optionally a servo motor), while the outlet conveyor belt 15 is driven by a second conveyor motor (the original production line motor can be used).

[0049] Regarding the subpackaging device, it can be specifically installed on the small package appearance detection channel. When the cigarette package passes by, the adjacent cigarette packages are separated by a distance to ensure the imaging effect of a single package of cigarettes. In detail, the subpackaging motor can be connected to the subpackaging device through a pulley and a toothed belt to provide subpackaging power for the subpackaging device and can regulate the subpackaging effect through the motor speed. Specifically, the subpackaging device may include a clamping mechanism, and through the speed and steering control of the subpackaging motor, the effects of easing clamping and rapid release can be achieved, which can avoid damage to the cigarette package and ensure the efficiency of continuous detection; in other embodiments, the subpackaging device can be a roller group located on the side of the conveyed cigarette package, and 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 conveying speed of the cigarette package, so as to achieve the purpose of separating adjacent cigarette packages at a certain distance, such as 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.

[0050] The second cigarette pack detection optical fiber and the third cigarette pack detection optical fiber are associated with the electrical signals of each visual detection device; the first cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber are associated with the packing device, the rejection device, and the electrical signals of each conveyor belt.

[0051] Of course, if Figure 1 In some preferred embodiments, a touch screen 20 and a warning light ( Figure 1 Components (not shown) and other components are used to improve the control convenience and processing timeliness of the detection system. For example, after a defective cigarette pack or a blocked condition is detected, the fault information can be checked and verified in a timely manner and the blocked cigarette pack can be cleared through components such as display screens and warning lights.

[0052] Here we provide Figure 2An example of an electrical connection block diagram of the appearance inspection system for small packages in a hard box is shown (only an implementation diagram, not a limitation), in which the signals detected by the second cigarette package inspection optical fiber 4 and the third cigarette package inspection optical fiber 10 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 two paths: the first path is sent to the aforementioned seven detection components to control fill light and shooting; the second path is that the trigger board directly transmits the signal to the PLC for information storage; and the signals detected by the first cigarette package inspection optical fiber 2, the fourth cigarette package inspection optical fiber 16, and the fifth cigarette package inspection optical fiber 19 can be connected to the PLC for controlling the conveyor belt, the rejection device, and the packaging device.

[0053] The warning light mentioned above can be connected to the PLC, and when receiving the alarm signal from the PLC, it will issue an audible and visual alarm; the touch screen 20 mentioned above can interact with the industrial computer (host computer) signal to perform control and warning in a visual manner.

[0054] To expand on this, in the above Figure 2 Based on the schematic electrical framework, the industrial computer can be connected to the PLC and each visual inspection device by electrical signals. For example, the camera in the inspection component can be connected to the industrial computer via Ethernet, and the PLC and the industrial computer can be connected via a network cable (preferably, the PLC can also store and record the inspection result information of the industrial computer). In addition, in actual operation, the upper ends of the subcontracting servo controller and the conveying servo controller can be connected to the PLC via a TwinCAT3 network cable, and the lower ends are connected to the motor of the subcontracting device and the motor of the conveying belt, receiving the start and stop signals from the PLC and controlling the start and stop of the subcontracting motor and the conveying motor accordingly.

[0055] Based on this electrical framework, functions such as parameter downloading and photo uploading can be realized between the camera of the detection component and the industrial computer. For example, the cigarette package can be photographed by the detection camera, and the cigarette package image is transmitted to the industrial computer. The industrial 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 the PLC receives the cigarette package defect signal, it can control the rejection solenoid valve to be energized, and then control the action of the rejection nozzle to reject the corresponding cigarette package.

[0056] Finally, based on the above system embodiment, the present invention combines Figure 3 A method for detecting the appearance of a small package in a hard box is provided. It should be pointed out that, in view of the above-mentioned defects of the existing small package appearance detection, the concept of the present invention is to design two detection stations, the first station completes the detection of the upper side, left side, right side, front side and back side, and the second station completes the following detection. The specific algorithm and decision logic implementation steps are as follows (the values ​​involved are exemplary):

[0057] Step 1: After the equipment is started, determine whether the equipment is in operation. If the equipment is not in operation, control the conveying motor and the subcontracting motor to stop running. If the equipment is in operation, proceed to step 2.

[0058] Step 2: When the first cigarette pack detection optical fiber detects the cigarette pack, the motor of the conveyor belt and the motor of the subpackaging device are started at the rising edge of the cigarette pack signal to transport the cigarette pack from left to right. The speed of the subpackaging servo motor is v1:

[0059] v1=2πR1N1

[0060] Among them, R1 is the radius of the subcontract motor pulley, and N1 is the speed of the subcontract motor.

[0061] As shown in the figure, if the first cigarette packet detection optical fiber does not detect a cigarette packet, the timer T1 is triggered synchronously. After T1>15s, the appearance inspection process is determined to be terminated. At this time, the conveyor belt, packaging device, etc. can be controlled to stop running.

[0062] Step 3: When the second cigarette pack detection optical fiber detects the presence of a cigarette pack, it indicates that the cigarette pack has arrived at the first detection station, triggering the five detection cameras of the first detection station to take pictures and transmit the images to the industrial computer; further, when the third cigarette pack detection optical fiber detects 1 that the cigarette pack has arrived at the second detection station, the two detection cameras 1 at this station take pictures and upload the images to the industrial computer.

[0063] Step 4: The industrial computer processes the photos uploaded by the seven cameras respectively, determines whether the cigarette package image is defective, and sends the processing result signal to the PLC; the signal can be in two states: OK means normal, and the storage result is 0; NG means abnormal, and the storage result is 1.

[0064] Step 5: PLC stores the signal sent by the industrial computer into the preset detection result queue. According to the length of the conveyor belt, the length from the first cigarette pack detection optical fiber to the fourth cigarette pack detection optical fiber is calculated. To avoid storage data overflow, the maximum storage data volume (such as 10) of the detection result queue corresponding to each detection component can be set.

[0065] The PLC receives the detection result signal sent by the industrial computer in real time, and stores it at the end of the detection result queue of the corresponding detection component, thereby forming a detection result queue for seven detection components. For example, if there are four packs of cigarettes between the first cigarette pack detection optical fiber and the fourth cigarette pack detection optical fiber, there will be four data in each queue.

[0066] Step 6: The cigarette pack continues to be transported to the right. When the cigarette pack reaches the fourth cigarette pack detection optical fiber, the PLC takes out one piece of data from the head of each detection result queue (the taken-out data is deleted from the original queue), and performs an "OR" operation. If all seven data in the operation result are 0, the final result is 0, that is, no processing is done for the current cigarette pack, waiting for the next cigarette pack to arrive, and then taking the next piece of data to judge in the above manner.

[0067] If one of the result signals is 1, that is, the result of the OR operation is 1, it means that the image of the cigarette pack is abnormal (NG). At this time, Step 7 is executed. In this way, according to the queue storage, the result of each detected cigarette pack is stored at the tail of the queue, and when each cigarette pack reaches the fourth cigarette pack detection optical fiber, the cigarette pack signal taken out from the queue is the first piece of data at the head of the queue, thus realizing the correspondence between the taken-out information and the cigarette pack arriving at the rejection station.

[0068] Step 7: The PLC controls the rejection solenoid valve to act, controls the rejection high-pressure nozzle to reject the corresponding defective cigarette pack, and synchronously, when the rising edge of the rejection signal arrives, the preset rejection timer T2 starts timing.

[0069] Step 8: When the fifth cigarette pack detection optical fiber indicates that there is a cigarette pack, it means that the cigarette pack has reached the conveying outlet position. At this time, it can be further determined whether the rejection fails. The specific steps can be referred to as follows: The distance between the fourth cigarette pack detection optical fiber and the fifth cigarette pack detection optical fiber is L4, and the cigarette pack transportation time from the fourth cigarette pack detection optical fiber to the fifth cigarette pack detection optical fiber can be expressed as follows:

[0070]

[0071] Among them, the conveying motor speed is v2, and k is a fixed coefficient, generally taken as 1, and it can be appropriately increased and decreased according to actual tests during the debugging process.

[0072] After calculating Δt, when there is a cigarette pack at the fifth cigarette pack detection optical fiber, if 0.7Δt < T2 < 1.2Δt, it means that after the rejection signal is sent, the cigarette pack is not rejected but reaches the fifth cigarette pack detection optical fiber in a short time. At this time, the PLC can send an alarm signal "rejection failure", and control the conveying motor and the sub-packaging motor to stop, and at the same time reset the data of the T2 timer.

[0073] In addition, when there is a cigarette pack at the fifth cigarette pack detection optical fiber, it can trigger the preset outlet blockage timer T3 to start timing. In actual operation, T3 can adopt the mode of timing when connected and resetting when disconnected. When the fifth cigarette pack detection optical fiber indicates that the cigarette pack stays at this position for more than the preset duration (such as 3s), it can be considered that the outlet is blocked. At this time, the conveying motor and the sub-packaging motor can be controlled to stop until the fifth cigarette pack detection optical fiber indicates that there is no cigarette pack, and then T3 is reset.

[0074] After the equipment is shut down, the operator needs to confirm whether the abnormality has been restored, and it needs to be reset again before it can start running. Therefore, the alarm information "rejection failure" or abnormal information such as outlet blockage issued by the PLC mentioned above can be transmitted to the industrial computer through the network cable and displayed on the touch screen. At the same time, the alarm light turns red to alert the operator.

[0075] In summary, the main design concept of the present invention is to take all-round photos of the appearance of the hard box small package at two stations through the two processes of horizontal conveying and side conveying, that is, to achieve visual inspection of the six sides and the drawstring of the small package. Specifically, the first inspection station of the horizontal conveying belt completes the photo inspection of the five sides, namely the left, right, back, front and top, and then the second station of the side conveying belt completes the inspection of the lower side of the cigarette package and the side drawstring, and then the defective cigarette package is removed on the outlet conveying belt, effectively preventing defective products from flowing into the next process. The present invention uses three groups of belts to respectively achieve all-round visual inspection and defective product removal, effectively controlling the quality of hard-pack small box products while ensuring the appearance inspection effect.

[0076] 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.

[0077] 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 small package appearance inspection system in a hard box, characterized in that: include: A horizontal conveyor belt, a subpackaging device for spacing adjacent cigarette packs, a first cigarette pack detection optical fiber arranged before the subpackaging device, and a first detection station located after the subpackaging device, wherein the first detection station is provided with a second cigarette pack detection optical fiber and a first visual detection device; A second inspection station is connected after the first inspection station, and the second inspection station specifically includes: a side conveying belt, a cigarette pack conveying wire for supporting the cigarette pack, a third cigarette pack inspection optical fiber, and a second visual inspection device; An outlet conveyor belt is connected after the second inspection station, a fourth cigarette pack inspection optical fiber is provided at a position of the outlet conveyor belt close to the second inspection station, a rejection device is provided after the fourth cigarette pack inspection optical fiber, and a fifth cigarette pack inspection optical fiber is provided after the rejection device; The second cigarette pack detection optical fiber and the third cigarette pack detection optical fiber are associated with the electrical signals of each visual detection device; the first cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber are associated with the packing device, the rejection device, and the electrical signals of each conveyor belt.

2. The appearance inspection system for small packages in hard boxes according to claim 1 is characterized in that: The first cigarette pack detection optical fiber, the second cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber are horizontally opposed optical fibers and are installed on the left and right sides of the conveyor belt; the third cigarette pack detection optical fiber is top-bottom opposed optical fiber and is installed on the top and bottom sides of the conveyor belt.

3. The appearance inspection system for small packages in hard boxes according to claim 1 is characterized in that: The horizontal conveying belt and the side conveying belt are powered by a first conveying motor, and the outlet conveying belt is driven by a second conveying motor.

4. The appearance inspection system for small packages in hard boxes according to claim 1 is characterized in that: The packing device decelerates the passing cigarette packs through a clamping mechanism or a roller group located on the side of the cigarette packs.

5. The appearance inspection system for small packages in hard boxes according to claim 1 is characterized in that: The detection system also includes a PLC; The signals detected by the second cigarette pack detection optical fiber and the third cigarette pack detection optical fiber are divided into two paths through the trigger board: the first path is sent to each visual detection device; The second route is delivered to PLC; The first cigarette pack detection optical fiber, the fourth cigarette pack detection optical fiber, and the fifth cigarette pack detection optical fiber are directly connected to the PLC signal and are used to control the conveyor belt, the packaging device, and the rejection device.

6. The appearance inspection system for small packages in hard boxes according to claim 5 is characterized in that: The detection system also includes an industrial computer, a touch screen and a warning light; The industrial computer is respectively connected to the touch screen, the PLC, and each visual detection device by electrical signals; the warning light is connected to the PLC.

7. The appearance inspection system for small packages in hard boxes according to any one of claims 1 to 6, characterized in that: The first visual inspection device comprises: a left inspection component, a right inspection component, a rear inspection component, a front inspection component and an upper inspection component respectively installed on the left side, the right side, the rear side, the front side and the upper front side of the first inspection station through an installation bracket; The second visual inspection device comprises: a lower inspection component and a drawstring inspection component respectively installed below and in front of the second inspection station through an installation bracket; Each detection component specifically includes: a detection camera and a fill light.

8. The appearance inspection system for small packages in hard boxes according to any one of claims 1 to 6, characterized in that: The rejecting device comprises: a rejecting electromagnetic valve, a rejecting high-pressure nozzle and a collection box arranged at one side of the rejecting station.

9. A method for detecting the appearance of a small package in a hard box, characterized in that: include: When the first cigarette pack detection optical fiber detects the cigarette pack, the conveyor belt and the packing device are started When the second cigarette pack detection optical fiber detects the cigarette pack, the visual detection device of the first detection station is triggered to take a photo and upload the image; When the third cigarette pack detection optical fiber detects the cigarette pack, the visual detection device of the second detection station is triggered to take a photo and upload the image; After processing the uploaded image, the processing result signal is stored at the end of the preset detection result queue; When the fourth cigarette packet detection optical fiber detects a cigarette packet, a detection result is taken from the head of the detection result queue and it is determined whether it is an abnormal result; If it is abnormal, the rejection device is triggered to act; When the fifth cigarette packet detection optical fiber detects the cigarette packet, it is determined that the cigarette packet appearance detection is completed.

10. The method for detecting the appearance of a small package in a hard box according to claim 9, characterized in that: The detection method further includes, when the fifth cigarette packet detection optical fiber detects the cigarette packet, determining whether the rejection action is effective: When the rejection device is triggered to act, a preset rejection timer is triggered; Calculate the transportation time Δt of the cigarette package from the fourth cigarette package detection optical fiber to the fifth cigarette package detection optical fiber according to the conveyor belt speed and the distance between the fourth cigarette package detection optical fiber and the fifth cigarette package detection optical fiber; When the fifth cigarette packet detection optical fiber detects a cigarette packet, if the timing of the rejection timer is between 0.7Δt and 1.2Δt, it is determined that the cigarette packet rejection fails.

Images