Cigarette packet transparent paper appearance packaging quality full-six-surface detection system and method

Abstract

The invention relates to the technical field of detection, in particular to a full-six-surface detection system and method for appearance packaging quality of transparent paper of a cigarette packet, and the system comprises a detection module, a control module, a display module and a display module, the detection module comprises a first camera shooting assembly arranged obliquely above the transparent frame plate, a second camera shooting assembly arranged obliquely below the transparent frame plate, a third camera shooting assembly and a fourth camera shooting assembly which are arranged on the two sides of the joint of the straight rail and the disc, and a fifth camera shooting assembly which is arranged above the disc and faces the joint of the straight rail and the disc; the sixth camera shooting assembly is arranged on the outer side of the disc and faces the transparent surrounding plate; according to the invention, the appearance detection of the six-surface transparent paper package of the cigarette packet can be carried out by adding a detection system without changing the condition of an original packaging equipment main body, and the industrial pain points of end face narrow slit imaging, synchronous registration, high-precision defect identification and the like are fully solved by the narrow-row line scanning imaging visual detection method disclosed by the invention.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection, and particularly relates to a full six-sided detection system and method for the appearance packaging quality of cigarette pack transparent paper. Background Art

[0002] Defects in the transparent paper packaging of cigarettes (such as loose packs, wrinkles, breaks, foreign objects, etc.) directly affect the brand appearance consistency and material consumption. The traditional method mostly uses multi-stage industrial cameras to take images of the six sides of the cigarette pack respectively. However, the visual windows on the end faces (the narrow left and right sides) are severely blocked by mechanisms such as guard plates and scraping tables, and imaging must be performed at close range in a narrow gap, which is prone to strong reflections and uneven exposure, resulting in frequent missed detections and false detections. In severe cases, manual sampling and review are required, reducing production capacity and quality control levels. At the same time, existing six-sided detection systems often require adding large optical machine structures to the packaging machine, which occupy a large space, have a long debugging cycle, and interfere with the original machine production rhythm and the operator's work station. Therefore, the industry urgently needs a new vision detection solution that occupies a small space, minimally modifies the host machine, and can stably complete end face defect detection at high production rhythms. Summary of the Invention

[0003] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the following technical problems in the prior art: existing drive circuits occupy a large space and have potential hazards.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a full six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, including a conveying platform, the conveying platform includes a straight rail and a disc, guard plates are arranged on both sides of the straight rail, a grabbing disc is arranged in the disc, the cigarette pack is conveyed to the disc through the straight rail, and the cigarette pack is driven by the grabbing disc to move circumferentially on the disc. A transparent frame plate is arranged on the straight rail, and a transparent enclosing plate is arranged on the outer side of the disc; a detection module, the detection module includes a first camera assembly arranged obliquely above the transparent frame plate, a second camera assembly arranged obliquely below the transparent frame plate, a third camera assembly and a fourth camera assembly arranged on both sides of the connection between the straight rail and the disc, a fifth camera assembly arranged above the disc and facing the connection between the straight rail and the disc, and a sixth camera assembly arranged on the outer side of the disc and facing the transparent enclosing plate; A control module, the control module includes a programmable logic controller and a vision industrial control host, the programmable logic controller is connected to each camera component of the detection module and controls the work to collect images, and the vision industrial control host is connected to each camera component of the detection module and receives the collected graphics for reprocessing and analysis.

[0006] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, a machine inner side wall is arranged on one side of the straight rail, the first camera component is fixed on the machine inner side wall, the first camera component faces the transparent frame plate, and a first lighting lamp and a second lighting lamp are also arranged on the machine inner side wall, the first lighting lamp illuminates the position above the transparent frame plate, and the second lighting lamp illuminates the position below the transparent frame plate.

[0007] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, a cross frame is arranged on the other side of the straight rail, a first side plate is arranged on one side of the cross frame, and a vertical plate is fixed on the first side plate.

[0008] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, a first extension plate is fixed on one side of the vertical plate by bolts, a second extension plate is arranged on the other side of the vertical plate, and both the first extension plate and the second extension plate are "L"-shaped plates.

[0009] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, the fourth camera component includes a fixed frame plate, a first round hole and a first arc notch are arranged on the fixed frame plate, and the center of the first arc notch coincides with the center of the first round hole.

[0010] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, the fourth camera component further includes a camera main body, a corner plate is fixed on the back of the camera main body by bolts, and the corner plate is also fixed on the side of the fixed frame plate by bolts.

[0011] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, two threaded holes are arranged on the side of the fifth camera component, bolts are arranged in the threaded holes, a hanging plate is arranged above the disc, two second arc notches with the same center are arranged on the hanging plate, and the bolts pass through the second arc notches to connect the fifth camera component and the hanging plate.

[0012] As a preferred technical solution of a six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, a triangular stop block is arranged at the end of the guard plate, a turntable is arranged on the disc, fixing plates are arrayed around the turntable, scraping platforms are arranged extending outward from the fixing plates, and clamping grooves are formed between the scraping platforms, and the cigarette pack is placed in the clamping grooves and moves. The distance between the end of the scraping table and the triangular stopper forms a narrow slit, and the third camera assembly and the fourth camera assembly are arranged facing the narrow slit.

[0013] The present invention also discloses a method based on the aforementioned full six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, further including The third camera assembly and the fourth camera assembly use the narrow-line scanning imaging vision detection method to detect the left and right end faces of the cigarette pack.

[0014] As a preferred technical solution of a full six-sided detection method for the appearance packaging quality of cigarette pack transparent paper, the narrow-line scanning imaging vision detection method includes Convey a single-pack cigarette pack to the narrow-slit detection station along the set conveying direction through a conveying mechanism; S1. At the narrow-slit detection station, utilize the narrow slit formed by the triangular guard plate and the end of the scraping table, and cooperate with a line array camera and a strip-shaped LED coaxial light source to perform synchronous line scanning imaging on the left and right end faces of the cigarette pack; S2. Collect the original line pixels of the line scan, combine the displacement signal of the conveying encoder to generate the unfolded images of the left and right end faces in real time, and perform flat-field correction and noise filtering preprocessing; S3. Perform multi-scale feature extraction on the end face unfolded images obtained in step S2, including brightness histogram equalization, fast feature matching, and straight line search, to obtain candidate regions for the edge folding ears, transparent paper creases / damages, and foreign object defects; S4. Use a defect classification model based on a convolutional neural network to discriminate the candidate regions, and output the defect type and severity level; S5. Send the defect discrimination result to the programmable logic controller, and trigger the rejection actuator according to the synchronous step parameter to reject the corresponding defective cigarette pack, completing the narrow-line scanning imaging vision detection on the outer side of the cigarette pack Advantages of the present invention: The present invention can add a detection system to perform appearance detection on the six-sided transparent paper packaging of cigarette packs without changing the main body of the original packaging equipment. Moreover, the narrow-line scanning imaging vision detection method of the present invention fully solves industry pain points such as narrow-slit imaging of the end face, synchronous registration, and high-precision defect recognition. Without affecting the host structure and rhythm, it realizes a greatly improved detection accuracy and remarkable economic benefits, and has outstanding technological progressiveness and industrial application value. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them: Figure 1Schematic diagram of the overall structure of the system of the present invention; Figure 2 Schematic diagram of the structures of the straight rail and the disc in the present invention; Figure 3 Schematic diagram of the fixing structure of the fourth camera module and the sixth camera module in the present invention; Figure 4 Schematic diagram of the narrow slit structure in the present invention; Figure 5 For the present invention Figure 1 Schematic diagram of the enlarged structure at position A in the present invention; Figure 6 Schematic diagram of the detection work process in the present invention; Figure 7 Schematic diagram of the detection action system in the present invention; Figure 8 Schematic diagram of the principle of the narrow line scan imaging vision detection method in the present invention.

[0016] Reference numerals: 100, conveying platform; 103, guard plate; 104, gripping disc; 300, cigarette pack; 102a, transparent enclosure; 101a, transparent frame plate; 202, second camera assembly; 203, third camera assembly; 206, sixth camera assembly; 200, detection module; 201, first camera assembly; 105, inner side wall of the machine table; 105a, first lighting lamp; 105b, second lighting lamp; 101, straight rail; 106, cross frame; 106a, first side plate; 106b, vertical plate; 106c, first extension plate; 106d, second extension plate; 204c, first arc notch; 204b, first round hole; 204, fourth camera assembly; 204d, camera body; 204e, angle plate; 204a, fixing frame plate; 205, fifth camera assembly; 102, disc; 108a, second arc notch; 205a, bolt; 108, hanging plate; 107, pressing rod; 103a, triangular stopper; 102b, turntable; 102c, fixing plate; 102d, scraping table; 102e, clamping groove. Detailed implementation manners

[0017] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention is made in conjunction with the accompanying drawings of the specification.

[0018] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0019] Second, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures or characteristics that may be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it an individual or selectively mutually exclusive embodiment with other embodiments.

[0020] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When detailing the embodiments of the present invention, for the convenience of explanation, the cross-sectional views showing the device structure will be locally enlarged out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0021] Embodiment 1 Referring to Figures 1 to 7 , this embodiment provides a full six-sided detection system for the appearance packaging quality of cigarette pack transparent paper, including a conveying platform 100. The conveying platform 100 includes a straight rail 101 and a disc 102. Guard plates 103 are arranged on both sides of the straight rail 101. A grasping disc 104 is arranged in the disc 102. The cigarette pack 300 is conveyed to the disc 102 through the straight rail 101, and the cigarette pack 300 is driven by the grasping disc 104 to move circumferentially on the disc. A transparent frame plate 101a is arranged on the straight rail 101, and a transparent enclosing plate 102a is arranged on the outer side surface of the disc 102; A detection module 200, the detection module 200 includes a first camera assembly 201 arranged obliquely above the transparent frame plate 101a, a second camera assembly 202 arranged obliquely below the transparent frame plate 101a, a third camera assembly 203 and a fourth camera assembly 204 arranged on both sides of the connection between the straight rail 101 and the disc 102, a fifth camera assembly 205 arranged above the disc 102 and facing the connection between the straight rail 101 and the disc 102, and a sixth camera assembly 206 arranged on the outer side of the disc 102 and facing the transparent enclosing plate 102a; A control module, the control module includes a programmable logic controller and a vision industrial control host. The programmable logic controller is connected to each camera assembly of the detection module 200 and controls the work to collect images. The vision industrial control host is connected to each camera assembly of the detection module 200 and receives the collected graphics for further processing and analysis.

[0022] The transparent enclosing plate 102a is a high-transparency quartz glass sheet fixed on the disc through a metal frame.

[0023] It should be noted that both the first camera assembly 201 and the second camera assembly 202 are arranged facing the transparent frame plate 101a. The first camera assembly 201 is used to take pictures and perform identification and detection on the top surface of the cigarette pack passing through the transparent frame plate 101a, and the second camera assembly 202 is used to take pictures and perform identification and detection on the bottom surface of the cigarette pack through the transparent frame plate 101a. The third camera assembly 203 and the fourth camera assembly 204 use the narrow-line scanning imaging vision detection method to detect the left and right end faces of the cigarette pack. The fifth camera assembly 205 is used to detect the front side of the cigarette pack. When the cigarette pack enters the disk 102 and is driven by the grasping disk 104 to the transparent enclosure 102a, the rear side of the cigarette pack faces the transparent enclosure 102a. At this time, the sixth camera assembly 206 is used to detect the rear side of the cigarette pack.

[0024] This system further includes a rejection component. The rejection component includes an electrically controlled lever arranged on the moving path of the cigarette pack. Specifically, the electrically controlled lever can be arranged on the disk, beside the transparent enclosure 102a.

[0025] A transparent paper packaging runner is arranged at the left end of the straight rail 101. The conveying system of the transparent paper packaging runner and the straight rail is a prior art, so the structure of the transparent paper packaging runner is not shown in the figure. The transparent paper packaging runner moves to push the cigarette pack from one end of the straight rail 101 to the other end and onto the disk 102.

[0026] Specifically, the transparent paper packaging runner periodically places the cigarette packs one by one at the end of the straight rail, pushes the cigarette packs intermittently to the right. A conveyor belt is arranged on the straight rail 101 to convey the cigarette packs to the right. A photoelectric sensor is arranged on the side at the intersection of the straight rail 101 and the disk 102 to detect whether a cigarette pack arrives at the edge part. After a cigarette pack arrives, the pressing rod 107 arranged above the straight rail 101 is triggered to press down to hold the cigarette pack at the edge, and at the same time, the transmission of the cigarette pack is stopped, and the fifth camera assembly 205 is used to take pictures and detect its front side.

[0027] One end of the pressing rod 107 is pivotally connected and fixed to the frame above the straight rail 101. The right side of the pressing rod 107 can be pressed down. A spring is arranged above the pressing rod 107 so that it can move up and return to its original position after being pressed down. The control of the pressing down of the pressing rod 107 can be achieved by the pressing down of an electrically controlled push rod.

[0028] Furthermore, the pressing rod 107 is in a horizontal state in its initial state, arranged above the cigarette pack, and used to limit the position of the top of the cigarette pack.

[0029] This system allows each cigarette pack to stay at its position for a short time, so as to have sufficient time to perform image acquisition on its six sides.

[0030] A circular groove is provided on the disc 102, and the turntable 102b is arranged in the circular groove. The turntable 102b is controlled by a motor to rotate. The motor, the electric control lever, and the push rod are all connected to the programmable controller to control the movement of the cigarette packs. At the same time, when an abnormality is detected, the programmable controller controls the electric control lever to act when the defective cigarette pack moves to the corresponding position on the disc 102, and the defective cigarette pack is removed.

[0031] Refer to Figure 6 and Figure 7 , and the specific working principle is as follows: When the conveying channel of the cigarette packs conveys the cigarette packs into the imaging field of view of the intelligent vision probe; then the intelligent vision imaging and image acquisition module collects the images into the internal of the vision industrial control computer; the collected original images are preprocessed by using image processing technology to improve the image quality, and the required feature quantities are extracted from them; finally, the intelligent vision algorithm tool is used to classify and sort the extracted feature quantities to complete the detection of the system; the programmable signal control module outputs the detection result signal of the defective cigarette packs to the servo host to perform automatic removal.

[0032] Through the programmable signal control module, the internal phase signal of the main machine system of the packaging machine is used to execute triggering and photographing. The signal triggering is not interfered by various external signals, and the signal triggering is stable and accurate; the installation positions, structures, etc. of each vision component are reasonably designed and easy to install; it does not interfere with the production operations of the machine operators and will not cause the detection device to fail due to accidental contact by human actions.

[0033] On one side of the straight rail 101, there is a side wall 105 inside the machine. The first camera assembly 201 is fixed on the side wall 105 inside the machine. The first camera assembly 201 is arranged facing the transparent frame plate 101a. On the side wall 105 inside the machine, there are also a first lighting lamp 105a and a second lighting lamp 105b. The first lighting lamp 105a illuminates the position above the transparent frame plate 101a, that is, the upper surface of the cigarette pack, and the second lighting lamp 105b illuminates the position below the transparent frame plate 101a, that is, the bottom surface of the cigarette pack.

[0034] The first camera assembly 201 is rotatably fixed on the side wall 105 inside the machine through a support rod to facilitate adjusting the angle of the first camera assembly 201 and aligning it with the upper side of the cigarette pack.

[0035] The second camera assembly 202 is fixed obliquely below the transparent frame plate 101a through a fixing frame. The fixing frame is also a structure that can adjust the angle of the second camera assembly 202. The fixing structure of the fourth camera assembly 204 can be referred to.

[0036] On the other side of the straight rail 101, there is a cross frame 106. On one side of the cross frame 106, there is a first side plate 106a, and a vertical plate 106b is fixed on the first side plate 106a.

[0037] The vertical plate 106b is on the first side plate 106a through bolts.

[0038] On one side of the vertical plate 106b, a first extension plate 106c is fixed by bolts. On the other side of the vertical plate 106b, a second extension plate 106d is provided. Both the first extension plate 106c and the second extension plate 106d are "L"-shaped plates.

[0039] The third camera assembly 203 is also fixed on the other side of the narrow slit opposite to the fourth camera assembly 204 through a connecting plate with an adjustable angle.

[0040] The fourth camera assembly 204 includes a fixed frame plate 204a. On the fixed frame plate 204a, a first round hole 204b and a first arc notch 204c are provided. The center of the first arc notch 204c coincides with the center of the first round hole 204b.

[0041] Two fixing holes are provided on the first extension plate 106c. One of the fixing holes coincides with the first round hole 204b and is connected by bolts. The other fixing hole corresponds to the first arc notch 204c and is fixed by bolts. In this way, by adjusting the position of the fixing hole in the first arc notch 204c, the orientation of the fourth camera assembly 204 is adjusted. During the adjustment process, the fourth camera assembly 204 rotates around the first round hole 204b.

[0042] The sixth camera assembly 206 is fixed on the second extension plate 106d in the same fixing manner.

[0043] The fourth camera assembly 204 further includes a camera body 204d. A gusset plate 204e is fixed to the back of the camera body 204d by bolts. The gusset plate 204e is also fixed to the side of the fixed frame plate 204a by bolts.

[0044] The gusset plate 204e is also an "L"-shaped plate.

[0045] Two threaded holes are provided on the side of the fifth camera assembly 205. Bolts 205a are provided in the threaded holes. Above the disc 102, a hanging plate 108 is provided. Two second arc notches 108a with the same center are provided on the hanging plate 108. The bolts 205a pass through the second arc notches 108a to connect the fifth camera assembly 205 and the hanging plate 108.

[0046] It should be noted that the hanging plate 108 is connected to the device provided on the top of the disc 102. On the existing cigarette pack packaging line, a frame is also provided on the top of the disc 102. The hanging plate 108 is connected to it, and the fifth camera assembly 205 is suspended at the connection of the straight rail 101 and the disc 102 facing the disc 102.

[0047] A triangular stop block 103a is provided at the end of the guard plate 103. A turntable 102b is provided on the disc 102. Fixed plates 102c are arranged in an array around the turntable 102b. A scraping table 102d extends outward from the fixed plate 102c. A clamping groove 102e is formed between the scraping tables 102d. The cigarette pack is placed in the clamping groove 102e and moves. The distance between the end of the scraping table 102d and the triangular stop block 103a forms a narrow slit. The third camera assembly 203 and the fourth camera assembly 204 are arranged facing the narrow slit.

[0048] The present invention can facilitate the transformation of existing packaging equipment, add detection devices such as cameras and lighting lamps to achieve six-sided detection. In particular, the narrow-line line-scanning imaging vision detection method is used to detect the left and right end faces of the cigarette pack, so that there is no need to separately establish a detection line to detect the end of the cigarette pack alone.

[0049] The first camera assembly 201, the second camera assembly 202, the third camera assembly 203, the fourth camera assembly 204, the fifth camera assembly 205 and the sixth camera assembly 206 all adopt intelligent vision imaging probes and can integrate lighting sources. Among them, the first camera assembly 201, the second camera assembly 202, the fifth camera assembly 205 and the sixth camera assembly 206 can adopt G-port high-speed industrial vision probes, and the main parameters are configured as follows: a 1.6-million-pixel network camera, IMX296, color, M12 front cover, sensor type CMOS, global shutter; sensor model Sony IMX296; pixel size 3.45 μm × 3.45 μm; target surface size 1 / 2.9"; resolution 1440 × 1080; maximum frame rate 65.2 fps @1440 × 1080 Bayer RG 8. The third camera assembly 203 and the fourth camera assembly 204 can adopt U-port high-speed industrial vision probes, and the performance parameters are configured as follows: a 1.6-million-pixel USB3.0 camera, IMX273, color, M12 port; performance sensor type CMOS, global shutter; sensor model SonyIMX273; pixel size 3.45 μm × 3.45 μm, target surface size 1 / 2.9"; resolution 1440 × 1080; maximum frame rate 165.4 fps@1440 × 1080 Bayer RG 8(ADC12, default); 249.1 fps@1440 ×1080 BayerRG 8(ADC8).

[0050] The digital programmable logic controller can adopt the S7-200 SMART ST30 model. The main parameters of the machine vision industrial control computer configuration are as follows: Intel® CoreTM i7-8700, 32GB of memory, 512G SSD + 2T HDD hard disk; Intel® UHD Graphics 630; 1 HDMI port and 1 VGA port; support for simultaneous independent display output, with a maximum support of 1920 × 1080 @60Hz; support for 8-channel opto-isolated input; support for 16-channel opto-isolated output (support for NPN / PNP switching); 6 Gigabit Ethernet ports for network interface; 4 USB2.0 interfaces and 4 USB3.0 interfaces.

[0051] Embodiment 2 Referring to Figure 8 , this embodiment also discloses a method based on the aforementioned full six-sided inspection system for the appearance packaging quality of cigarette pack transparent paper, including: The third camera assembly and the fourth camera assembly use the narrow-line scanning imaging vision inspection method to inspect the left and right end faces of the cigarette pack.

[0052] The narrow-line scanning imaging vision inspection method includes Convey a single-pack cigarette pack to the narrow-slit inspection station along the set conveying direction through the conveying mechanism; S1. At the narrow-slit inspection station, utilize the narrow slit formed by the triangular guard plate and the end of the scraping table, cooperate with the line array camera and the bar-shaped LED coaxial light source, and perform synchronous line scanning imaging on the left and right end faces of the cigarette pack; S2. Collect the original line pixels of the line scan, combine the displacement signal of the conveying encoder to generate the unfolded images of the left and right end faces in real time, and perform flat-field correction and noise filtering preprocessing; S3. Perform multi-scale feature extraction on the unfolded end face images obtained in step S2, including brightness histogram equalization, fast feature matching, and straight line search, to obtain the candidate regions of the edge folding ears, transparent paper creases / damages, and foreign object defects; S4. Use the defect classification model based on the convolutional neural network to discriminate the candidate regions, and output the defect type and severity level; S5. Send the defect discrimination result to the programmable logic controller, trigger the rejection actuator according to the synchronous step parameter to reject the corresponding defective cigarette pack, and complete the narrow-line scanning imaging vision inspection of the outer side of the cigarette pack.

[0053] Next, in combination with some preferred or optional examples of the present invention, the implementation process and / or effects of certain examples of the present invention will be described more specifically.

[0054] Exemplarily, taking the transformation of the GD-ZB45 packaging machine production line of a certain cigarette factory as an example, the speed is 300 packs per minute.

[0055]

Narrow Slot Station and Opto-Mechanical-Electrical Assembly

[0056] Install two cameras symmetrically outside the narrow slot, with the main parameter configuration: 1.6 million pixel USB3.0 cameras (performance: sensor type CMOS, global shutter; sensor model Sony IMX273; pixel size 3.45 μm × 3.45 μm Target surface size 1 / 2.9"; resolution 1440 × 1080; maximum frame rate 165.4 fps@1440 × 1080 Bayer RG 8 (ADC12, default); 249.1 fps@1440 × 1080 Bayer RG 8 (ADC8)). The cameras are connected to the industrial control computer through 7 m USB3.0-AOC fiber optic cables.

[0057] Each camera is coaxially equipped with a digital LED bar light source (peak 460 nm, illuminance ≥ 120 klx, incident angle 45°). The blue light band can amplify the difference between the crease of the transparent paper and the reflection of the trademark paper.

[0058] A 1024-line servo encoder + reflective optoelectronics form a "light - pulse" hard trigger, and the PLC (S7-200 SMART ST30) outputs a LINE0 hard trigger optocoupler signal; the system compensates the pixel - displacement error online to within ±0.2 mm.

[0059]

Real - Time Line Image Stitching and Pre - Processing

[0060]

Multi - Scale Feature Extraction

[0061] Line search (Hough): threshold 120 pixel·vote, minimum line length 0.8 mm; if the folding ear angle > 7 °, a candidate is generated.

[0062] FAST-ORB matching: upper limit of the number of features is 50, matching score ≥ 0.65; used to identify breaks or gaps in the transparent paper.

[0063] ROI output: After the fusion of three types of algorithms, an average of 4 candidate boxes per end face are output, and the false detection rate is controlled within 0.8%.

[0064]

Intelligent Defect Classification

[0065] Label system: ① Loose transparent paper, ② Wrinkles, ③ Breaks, ④ Foreign object attachment, ⑤ Reverse wrapping of the trademark paper; each category is divided into three severity levels: I / II / III.

[0066] Online self-learning: After 500 qualified samples are accumulated, the batch normalization layer is automatically fine-tuned to adapt to the background drift caused by LED attenuation or dust pollution.

[0067]

Rejection Execution and Closed Loop

[0068] The following are some data displays of the comprehensive application scenario and detection results: Equipment: GD-ZB45 packaging machine + the above narrow slit detection unit Theoretical speed: 300 packages / minute × 8 h × shift (theoretical daily output: 432,000 packages) Test batch: Cigarettes of the same brand, transparent paper thickness 27 µm; Continuous production data for 72 h are as follows: Total number of detected packages: 1,263,000 packages; Actual number of defective packages detected: 3,471, including 1,876 ear folds, 731 wrinkles, 419 breaks, 234 loose packages, and 211 foreign objects; Actual number of defective cigarette packages detected: 3,468; Detection rate: 99.91% (3,468 / 3,471); False rejection rate: 0.41‰ (518 / 1,263,000 qualified packages).

[0069] Without changing the host drive structure, the narrow-row line-scan imaging detection unit significantly improves the quality control ability of the end face transparent paper, ensures the highly reliable detection of key defects such as end face loose packages and folded ears, and reduces the manual sampling workload by more than 95%, bringing stable material savings and improved brand appearance consistency to users.

[0070] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions can be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine task of design, manufacturing, and production.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A six-sided inspection system for the appearance packaging quality of cigarette pack transparent paper, characterized in that: including, a conveying platform (100), the conveying platform (100) includes a straight rail (101) and a disc (102), guard plates (103) are arranged on both sides of the straight rail (101), a gripping disc (104) is arranged in the disc (102), cigarette packs (300) are conveyed to the disc (102) through the straight rail (101), and the cigarette packs (300) are driven by the gripping disc (104) to move circumferentially on the disc. A transparent frame plate (101a) is arranged on the straight rail (101), and a transparent enclosing plate (102a) is arranged on the outer side surface of the disc (102); a detection module (200), the detection module (200) includes a first camera assembly (201) arranged obliquely above the transparent frame plate (101a), a second camera assembly (202) arranged obliquely below the transparent frame plate (101a), a third camera assembly (203) and a fourth camera assembly (204) arranged on both sides of the connection between the straight rail (101) and the disc (102), a fifth camera assembly (205) arranged above the disc (102) and facing the connection between the straight rail (101) and the disc (102), and a sixth camera assembly (206) arranged on the outer side of the disc (102) and facing the transparent enclosing plate (102a); a control module, the control module includes a programmable controller and a vision industrial control host. The programmable controller is connected to each camera assembly of the detection module (200) and controls the work to collect images. The vision industrial control host is connected to each camera assembly of the detection module (200) and receives the collected graphics for reprocessing and analysis.

2. The full six-sided inspection system for the appearance packaging quality of the transparent paper of cigarette packs according to claim 1, characterized in that: One side of the straight rail (101) is provided with an inner side wall (105) of the machine table. The first camera assembly (201) is fixed on the inner side wall (105) of the machine table. The first camera assembly (201) faces the transparent frame plate (101a). A first lighting lamp (105a) and a second lighting lamp (105b) are also arranged on the inner side wall (105) of the machine table. The first lighting lamp (105a) illuminates the position above the transparent frame plate (101a), and the second lighting lamp (105b) illuminates the position below the transparent frame plate (101a).

3. The full six-sided detection system for the appearance packaging quality of cigarette pack transparent paper according to claim 2, wherein: A cross frame (106) is arranged on the other side of the straight rail (101). A first side plate (106a) is arranged on one side of the cross frame (106), and a vertical plate (106b) is fixed on the first side plate (106a).

4. The six-sided inspection system for the appearance packaging quality of cigarette pack transparent paper according to claim 3, characterized in that: A first extension plate (106c) is fixed on one side of the vertical plate (106b) by bolts, and a second extension plate (106d) is arranged on the other side of the vertical plate (106b). Both the first extension plate (106c) and the second extension plate (106d) are "L"-shaped plates.

5. The full six-sided inspection system for the appearance packaging quality of cigarette pack transparent paper according to claim 4, wherein: The fourth camera assembly (204) includes a fixed frame plate (204a). A first round hole (204b) and a first arc notch (204c) are arranged on the fixed frame plate (204a). The center of the first arc notch (204c) coincides with the center of the first round hole (204b).

6. The all-six-sided inspection system for the appearance packaging quality of the cigarette pack transparent paper according to claim 5, characterized in that: The fourth camera assembly (204) further includes a camera body (204d). A gusset plate (204e) is bolted to the back of the camera body (204d), and the gusset plate (204e) is also bolted to the side of the fixed frame plate (204a).

7. The full six - sided inspection system for the appearance packaging quality of the transparent paper of cigarette packs according to claim 6, wherein: Two threaded holes are provided on the side of the fifth camera assembly (205), and bolts (205a) are arranged in the threaded holes. A hanging plate (108) is provided above the disc (102). Two second arc notches (108a) with the same center are provided on the hanging plate (108). The bolts (205a) pass through the second arc notches (108a) to connect the fifth camera assembly (205) and the hanging plate (108).

8. The full six-sided inspection system for the appearance packaging quality of the cigarette pack transparent paper according to claim 7, characterized in that: A triangular stop block (103a) is provided at the end of the guard plate (103). A turntable (102b) is provided on the disc (102). Fixing plates (102c) are arrayed around the turntable (102b). A scraping table (102d) extends outward from the fixing plate (102c). A clamping groove (102e) is formed between the scraping tables (102d). The cigarette pack is placed in the clamping groove (102e) and moves. The distance between the end of the scraping table (102d) and the triangular stop block (103a) forms a narrow slit. The third camera assembly (203) and the fourth camera assembly (204) are arranged facing the narrow slit.

9. A method for a six-sided inspection system of the appearance packaging quality of cigarette pack transparent paper according to any one of the preceding claims 1 to 8, characterized in that: It further includes The third camera assembly (203) and the fourth camera assembly (204) detect the left and right end faces of the cigarette pack by using the narrow-line scanning imaging vision detection method.

10. The method according to claim 9, wherein: The narrow-line scanning imaging vision detection method includes Conveying a single-pack cigarette pack to the narrow-slit detection station along the set conveying direction through a conveying mechanism; S1. At the narrow-slit detection station, using the narrow slit formed by the triangular guard plate and the end of the scraping table, in cooperation with a line array camera and a strip-shaped LED coaxial light source, perform synchronous line scanning imaging on the left and right end faces of the cigarette pack; S2. Collect the original line-scanned row pixels, and combine the displacement signal of the conveying encoder to generate the unfolded images of the left and right end faces in real time, and perform flat-field correction and noise filtering preprocessing; S3. Perform multi-scale feature extraction on the end-face unfolded images obtained in step S2, including brightness histogram equalization, fast feature matching, and line search, to obtain candidate areas for the edge folding ears, transparent paper creases / damages, and foreign object defects; S4. Use a defect classification model based on a convolutional neural network to discriminate the candidate areas, and output the defect type and severity level; S5. Send the defect discrimination result to a programmable logic controller, and trigger the rejection actuator to reject the corresponding defective cigarette pack according to the synchronous step parameter, completing the narrow-line scanning imaging vision detection on the outer side of the cigarette pack.

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