An online quality inspection and rejection device for printed packaging materials
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-25
- Publication Date
- 2026-08-14
AI Technical Summary
[0005]本发明的目的在于提供一种包装印刷品在线质量检测与剔除装置，以解决现有包装盒检测装置难以同时完成六个表面全面检测，以及现有技术采用翻转或旋转结构导致检测效率低且易损伤产品等相关技术问题
本发明公开的包装印刷品在线质量检测与剔除装置，其通过将上料输送机、不合格品输送机和合格品输送机依次并行设置，并在三者上方横跨设置抓料转运输送机构，使包装盒在上料输送机上先完成上、左、右三面拍照后，由抓料转运输送机构连续抓取并横向移动，然后在横向移动过程中再由第二视觉检测组件完成下、前、后三面拍照，实现了包装盒六个外表面的全覆盖在线检测。在上述过程中，上料输送机与横跨抓取动作在时间和空间上协同配合，上料输送机负责连续供料和第一工位拍照，抓料转运输送机构负责将已拍完三面的包装盒平稳地横向转运至第二检测工位，无需停顿或翻转，其不仅大幅提高了检测效率，而且避免了包装盒因翻转或旋转可能导致的产品受损、二次检测前产品姿态不正确而导致检测结果的准确率较低等问题。
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Figure CN122558823A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of printing inspection technology, and specifically discloses an online quality inspection and rejection device for printed packaging materials. Background Technology
[0002] In the production process of packaging and printing, printing quality directly affects the appearance and brand image of the product. With the rapid development of machine vision technology, online automatic inspection systems have been widely used in printing and packaging production lines. By capturing images of the surface of packaging products with industrial cameras and comparing them with standard templates, common printing defects such as insufficient ink, ink smearing, dirt spots, and misregistration can be detected in real time, thereby replacing manual visual inspection and improving inspection efficiency and accuracy.
[0003] For packaging boxes, which have six outer surfaces (top, bottom, front, back, left, and right sides), and which typically need to be folded and filled with products after printing, the printed patterns on all six sides must be complete, clear, and without misalignment. Therefore, online inspection systems need to perform comprehensive inspections on all six sides of the packaging box to ensure the quality of the finished product.
[0004] Most existing online inspection devices for printed materials can only photograph a maximum of three sides of the product. For example, a common solution is to install cameras above and on both sides of the conveyor belt, which can only photograph the top and left and right sides of the packaging box. The bottom side cannot be photographed because it is in direct contact with the conveyor belt, and the front and rear sides are also difficult to photograph because adjacent boxes in the conveying direction block each other. In order to achieve complete inspection of all six sides of the packaging box, some existing technologies use a flipping mechanism or a rotating table to flip or rotate the packaging box and then photograph it again. However, this approach has the following problems: First, the flipping and rotating actions require additional stations and time, and if all six sides are to be inspected, two stations for flipping and rotating are required, which greatly reduces the inspection efficiency. Second, the packaging box is easily squeezed or scratched during the flipping process, which increases the defect rate of the printed materials. Third, after the packaging box is flipped or rotated, it cannot be guaranteed that it is in the correct posture for accurate inspection by the camera, so the accuracy of the photographic inspection results cannot be guaranteed. Based on this, this application proposes an online quality inspection and rejection device for printed packaging. This device can continuously photograph the six outer surfaces of packaging box products online to improve the efficiency of printing quality inspection, while avoiding product damage caused by the flipping of the packaging box. Summary of the Invention
[0005] The purpose of this invention is to provide an online quality inspection and rejection device for printed packaging, in order to solve the problems of existing packaging box inspection devices being unable to simultaneously complete comprehensive inspection of six surfaces, and the low inspection efficiency and easy damage to products caused by the use of flipping or rotating structures in existing technologies.
[0006] This invention is achieved through the following technical solution: An online quality inspection and rejection device for printed packaging includes a feeding conveyor, a defective product conveyor, and a qualified product conveyor arranged in parallel. A material handling and transfer conveyor mechanism is arranged across the top of the feeding conveyor, the defective product conveyor, and the qualified product conveyor. The feeding conveyor is equipped with a first visual inspection component that takes pictures of the top, left, and right sides of the packaging box, and the material handling and transfer conveyor mechanism is equipped with a second visual inspection component that takes pictures of the bottom, front, and rear sides of the packaging box. The material handling and conveying mechanism includes a horizontal seat, a closed-loop conveying assembly installed in the horizontal seat, and multiple adsorption material handling mechanisms connected at equal intervals to the closed-loop conveying assembly. Each adsorption material handling mechanism includes a strip plate, an adsorption box, and a lifting rod. The strip plate is connected to the closed-loop conveying assembly. The lifting rod passes through the strip plate, with an abutment wheel at one end and the other end connected to the adsorption box. A first spring is installed between the adsorption box and the strip plate. A suction cup is installed on the lower surface of the adsorption box. A piston plate is movably installed in the inner cavity of the adsorption box via a guide rod and a second spring. A magnetic block is installed at the upper end of the piston plate. An electromagnet is installed on the top wall of the adsorption box. Carbon brush blocks are electrically connected to the positive and negative terminals of the electromagnet in the circuit. The cross seat is also fixedly provided with a guide block that interacts with the abutment wheel. Both sides of the guide block are provided with conductive copper strips that slide in contact with the carbon brush block. The lower end of the guide block is provided with a downward pressing protrusion that is aligned with the position of the feeding conveyor. The starting end of the conductive copper strip extends from the bottom of the downward pressing protrusion all the way to the top of the qualified product conveyor. A rejection cylinder is provided on the cross seat at a position aligned with the unqualified product conveyor. The telescopic end of the rejection cylinder is connected to a pusher plate.
[0007] As a further configuration of the above scheme, the first visual inspection component and the second visual inspection component have the same structure, both including a U-shaped frame and three CCD cameras mounted on the U-shaped frame; the U-shaped frame in the first visual inspection component is fixed on the feeding conveyor, and its three CCD cameras are respectively positioned downward, left and right; the U-shaped frame in the second visual inspection component is inverted and fixed on the horizontal seat, and its three CCD cameras are respectively positioned upward, forward and backward.
[0008] As a further provision of the above scheme, the closed-loop conveying assembly includes axles rotatably disposed at the left and right ends of the cross seat, each axle having a drive wheel at both its front and rear ends, and one axle having a conveying power source connected to its end; a conveying component is disposed between the two drive wheels aligned left and right, and the two ends of the strip in the adsorption and gripping mechanism are respectively connected to the two conveying components.
[0009] As a further feature of the above scheme, the positive and negative poles of the electromagnet connected to the circuit are respectively connected to two rigid rods that are vertically fixed to the upper surface of the adsorption box through wires. Each rigid rod is provided with a carbon brush block at the top, and the carbon brush block is supported by a spring at the top of the rigid rod to achieve vertical extension and retraction.
[0010] As a further feature of the above scheme, the feeding end of the feeding conveyor is provided with a central guide plate. The two central guide plates are arranged in a mirror image symmetrically above the feeding end of the feeding conveyor, and the feeding ends of the two central guide plates are open.
[0011] As a further feature of the above solution, a horizontal plate is fixedly installed at the rear end of the feeding conveyor, and a limit baffle is installed in front of the horizontal plate. An adjusting screw connected to the limit baffle is threaded onto the horizontal plate.
[0012] As a further feature of the above solution, the feeding conveyor is a height-adjustable conveyor to accommodate packaging boxes of different thicknesses and to ensure that the upper surface of the packaging box being gripped by the adsorption and gripping mechanism is always kept at the same height.
[0013] As a further feature of the above solution, a control box is also included. The first and second vision detection components are both electrically connected to the control box. The control box has a built-in processing module and is equipped with a display screen. The signal output terminal of the control box is electrically connected to the rejection cylinder.
[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses an online quality inspection and rejection device for printed packaging. It arranges a feeding conveyor, a defective product conveyor, and a qualified product conveyor in parallel, with a material-grabbing and transfer conveyor mechanism spanning across them. The packaging box is first photographed from the top, left, and right sides on the feeding conveyor. Then, the material-grabbing and transfer conveyor mechanism continuously grabs the box and moves it laterally. During this lateral movement, a second vision inspection component photographs the bottom, front, and back sides, achieving full-coverage online inspection of all six outer surfaces of the packaging box. In this process, the feeding conveyor and the lateral grabbing action coordinate in time and space. The feeding conveyor is responsible for continuous material supply and photographing at the first station, while the material-grabbing and transfer conveyor mechanism smoothly transfers the photographed packaging box laterally to the second inspection station without stopping or flipping. This significantly improves inspection efficiency and avoids problems such as product damage caused by flipping or rotating the packaging box, and low accuracy of inspection results due to incorrect product posture before secondary inspection.
[0015] In this invention, the lifting and lowering of the adsorption and gripping mechanism is achieved through the cooperation of the guide block and its downward pressing protrusion with the abutment wheel, without the need for an additional power source. At the same time, the power supply of the electromagnet on the adsorption box is completed through the sliding contact between the carbon brush block and the conductive copper strip. The conductive copper strip extends from the downward pressing protrusion to the top of the qualified product conveyor, so that the adsorption force is maintained only during the gripping, transfer and rejection stages, and the power is automatically cut off at the release point of the qualified product, realizing precise control of adsorption and release. Its structure is compact and ingeniously designed, effectively avoiding the problems of tangled air hoses or complex solenoid valve control in traditional systems.
[0016] This invention is equipped with a feeding conveyor, a defective product conveyor, and a qualified product conveyor, and is equipped with a rejection cylinder. It can automatically push defective products to the defective product conveyor according to the detection results, while qualified products continue to be transferred to the qualified product conveyor, realizing automatic separation of good and defective products and avoiding mixing.
[0017] The present invention further provides a centrally located guide plate in the shape of an octagon at the inlet end of the feeding conveyor, and an adjustable limit baffle at the rear end. It can also be equipped with a feeding conveyor with adjustable height, which can adapt to packaging boxes of different sizes and thicknesses. The whole device is highly versatile and easy to adjust when changing production. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a top view schematic diagram of the structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the feeding conveyor, the first vision inspection component, etc. in this invention; Figure 4 This is a three-dimensional structural diagram of the internal structure of the material handling and conveying mechanism in this invention; Figure 5 This is a three-dimensional structural diagram of the guide block and conductive copper strip in this invention; Figure 6 This is a three-dimensional structural diagram of the adsorption and material gripping mechanism in this invention; Figure 7 This is a schematic diagram of the three-dimensional cross-sectional structure of the adsorption box in this invention; Figure 8 For the present invention Figure 4 A magnified structural diagram of point A in the middle. Detailed Implementation
[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-8 This application will be described in detail with reference to the embodiments. Example 1
[0022] Example 1 discloses an online quality inspection and rejection device for printed packaging materials, such as... Figure 1 and Figure 2 As shown, the device includes three parallel conveyors: a feeding conveyor 10, a defective product conveyor 20, and a qualified product conveyor 30. A material handling and transfer conveyor 40 is arranged horizontally above the three conveyors. A first visual inspection component 50 is installed on the feeding conveyor 10, and a second visual inspection component 60 is installed on the material handling and transfer conveyor 40. The first visual inspection component 50 and the second visual inspection component 60 are electrically connected to a control box 70 with a built-in processing module. The control box 70 is also equipped with a display screen 71.
[0023] During the printing inspection of packaging box 100, the first vision inspection component 50 takes online photos of the top surface, left side, and right side of the packaging box. Subsequently, the packaging box 100 is attracted and moved laterally by the material handling and conveying mechanism 40. When it passes the second vision inspection component 60, the second vision inspection component 60 takes online photos of its bottom surface, front side, and rear side. Finally, the printed patterns on the six sides of the packaging box 100 are displayed on the screen 71, and the processing module compares the printed patterns on these six sides to determine whether the printing quality of the packaging box 100 meets the requirements.
[0024] The material handling and conveying mechanism 40 includes a horizontal seat 41, with support frames 42 at both ends of the horizontal seat 41. The support frames 42 on both sides ensure that the horizontal seat 41 is stably positioned directly above the three conveyors. A closed-loop conveying assembly 43 is installed in the horizontal seat 41, and multiple adsorption and material handling mechanisms 44 are connected at equal intervals on the closed-loop conveying assembly 43.
[0025] like Figure 4As shown, the closed-loop conveying assembly 43 includes axles 431 rotatably mounted at the left and right ends of the cross seat 41. A drive wheel 432 is mounted at both the front and rear ends of each axle 431, and a conveying power source 433 mounted on the outer surface of the cross seat 41 is connected to the end of one of the axles 431. A conveying element 434 is positioned between the two aligned drive wheels 432, and multiple adsorption and gripping mechanisms 44 are equally spaced connected to the two conveying elements 434. In specific designs, the conveying element 434 can be a synchronous belt or a drive chain, and the drive wheels 432 can be selected accordingly as synchronous belt pulleys or sprockets.
[0026] like Figure 6 and Figure 7 As shown, the adsorption and gripping mechanism 44 includes a strip 441 spanning between two conveying components 434, with an adsorption box 442 disposed below the strip 441. A lifting rod 443, extending vertically upward through the strip 441, is disposed at the upper end of the adsorption box 442, and an abutment wheel 4431 is disposed at the top of the lifting rod 443. A first spring 444, connecting the adsorption box 442 and the strip 441, is sleeved around the lifting rod 443. Multiple suction cups 4421, communicating with the inner cavity of the adsorption box 442, are arranged in a rectangular array on the lower surface of the adsorption box 442. A piston plate 445, sealed to the surrounding inner walls by a sealing ring, is disposed within the inner cavity of the adsorption box 442. The piston plate 445 is connected to the top wall of the adsorption box 442 by a guide rod 4451 and a second spring 4452. A magnetic block 446 is provided on the upper surface of the piston plate 445, and an electromagnet 447 is provided on the inner surface of the top wall of the adsorption box 442 directly above the magnetic block 446. The positive and negative poles of the electromagnet 447 are respectively connected to two rigid rods 448 that are vertically fixed on the upper surface of the adsorption box 442. Each rigid rod 448 has a carbon brush block 449 that is supported by a spring and can extend and retract slightly up and down. The inner end of the carbon brush block 449 is connected to a wire that runs along the inside of the rigid rod 448, and the wire is connected to the electromagnet 447.
[0027] like Figure 3 , Figure 5 and Figure 8As shown, a guide block 45 is fixedly installed in the cross seat 41, and the abutment wheels 4431 on all the adsorption and gripping mechanisms 44 abut against the outer contour surface of the guide block 45. A downwardly protruding pressing protrusion 451 is provided at the bottom of the guide block 45, located directly above the feeding conveyor 10. Conductive copper strips 46 are fixedly installed on both sides of the guide block 45, and the two conductive copper strips 46 are connected to the positive and negative terminals of the power supply respectively via wires. The starting end of the conductive copper strip 46 extends from the bottom of the pressing protrusion 451 and then extends directly above the qualified product conveyor 30. When the adsorption and gripping mechanism 44 moves along this section of the conductive copper strip 46, the carbon brush blocks 449 at the top of the two rigid rods 448 can always maintain sliding contact with the conductive copper strips 46 on both sides, thereby realizing the current conduction of the electromagnet 447, and thus generating an adsorption magnetic field for the magnetic block 446. In addition, a rejection cylinder 80 is provided on the cross seat 41 aligned with the defective product conveyor 20. The telescopic end of the rejection cylinder 80 is connected to a pusher plate 81 aligned with the lower end of the moving adsorption and gripping mechanism 44.
[0028] like Figure 1 and Figure 2 As shown, the first visual inspection component 50 and the second visual inspection component 60 have basically the same structure. The first visual inspection component 50 includes a U-shaped frame 51 fixedly mounted on the feeding conveyor 10. A CCD camera 52 facing the central conveying channel is provided on the top and left and right sides of the U-shaped frame 51. When the packaging box 100 moves past the U-shaped frame 51, the CCD cameras 52 in the three directions take pictures of its upper surface, left side, and right side, respectively. After taking pictures, the packaging box 100 continues to be conveyed to the material handling and transfer conveyor 40 directly below it to wait to be picked up.
[0029] Similarly, the second visual inspection component 60 also includes a U-shaped frame, which is inverted and fixedly connected to the cross seat 41, and located above the feeding conveyor 10 and the defective product conveyor 20. A CCD camera is installed at the bottom and on the front and rear sides of the U-shaped frame, respectively facing the lower surface, front side, and rear side of the packaging box 100 being gripped by the adsorption and gripping mechanism 44. When the packaging box 100 is moved laterally by the adsorption and gripping mechanism 44 past the U-shaped frame, the three CCD cameras take pictures sequentially.
[0030] The entire detection and rejection process is as follows: First, the feeding conveyor 10 sequentially transports the packaging boxes 100 through the first vision detection component 50, which takes pictures of the top, left, and right sides and transmits the images to the control box 70. Then, the packaging boxes 100 continue to move backward to directly below the gripping and transferring conveyor mechanism 40. At this time, the adsorption gripping mechanism 44 moves with the closed-loop conveyor component 43 to the downward pressing protrusion 451, and the abutment wheel 4431 moves downward along the downward pressing protrusion 451, causing the adsorption box 442 and suction cup 4421 to descend and contact the upper surface of the packaging box 100. Simultaneously, the carbon brush block 449 begins to contact the conductive copper strip 46, the electromagnet 447 is energized, the magnetic block 446 is lifted, the piston plate 445 moves upward, and a negative pressure is generated in the suction cup 4421 to adsorb the packaging box 100.
[0031] After the packaging box 100 is adsorbed and gripped, the adsorption and gripping mechanism 44 moves laterally, and when it passes the second vision detection component 60, the second vision detection component 60 takes pictures of the bottom, front, and back sides of the packaging box. The processing module of the control box 70 compares the images of the six sides to determine whether they are qualified.
[0032] If the product is determined to be qualified, the adsorption and gripping mechanism 44 continues to move to directly above the qualified product conveyor 30 while maintaining the adsorption state. When the carbon brush block 449 leaves the end of the conductive copper strip 46, the electromagnet 447 is de-energized, the piston plate 445 returns to its original position under the action of the second spring 4452, and the suction cup 4421 releases the packaging box 100, causing it to fall onto the qualified product conveyor 30. If the product is determined to be unqualified, the control box 70 issues a rejection signal. When the adsorption and gripping mechanism 44 moves to the position of the rejection cylinder 80 (while still within the power supply range of the conductive copper strip 46, the adsorption force is maintained), the rejection cylinder 80 quickly extends, and the pusher plate 81 pushes the packaging box 100 off the suction cup 4421 from the rear side, causing it to fall onto the unqualified product conveyor 20. Example 2
[0033] Example 2 discloses a scheme based on the technical solution in Example 1 and further optimized design. The similarities between Example 2 and Example 1 will not be described again.
[0034] like Figure 3 As shown, this embodiment 2 focuses on improving and optimizing the feeding conveyor 10 to ensure that each CCD camera can vertically capture the central area of the side of the packaging box 100 when taking pictures. The specific improvement methods are as follows: Firstly, a central guide plate 11 is provided at the feeding end of the feeding conveyor 10. The two central guide plates 11 are mirror-symmetrically arranged above the feeding end of the feeding conveyor 10, and the feeding ends of the two central guide plates 11 are arranged in a figure-eight shape, so that the packaging box 100 is automatically centered before entering the inspection area.
[0035] Secondly, a horizontal plate 12 is fixedly installed at the rear end of the feeding conveyor 10, and a limiting baffle 13 is installed in front of the horizontal plate 12, located below the material grabbing and transfer conveying mechanism 40. An adjusting screw 14 connected to the limiting baffle 13 is threaded onto the horizontal plate 12. By rotating the adjusting screw 14, the front and rear positions of the limiting baffle 13 can be changed to ensure that the packaging box 100 is exactly below it before being grabbed by the adsorption grabbing mechanism 44.
[0036] Thirdly, the feeding conveyor 10 in this embodiment 2 can also adopt a vertically adjustable design. When used for detecting packaging boxes 100 of different thicknesses, the height of the feeding conveyor 10 can be changed so that the upper surface of the packaging box 100 being gripped by the adsorption and gripping mechanism 44 is always kept at the same height, so that it can be smoothly gripped by the moving adsorption and gripping mechanism 44.
[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An online quality inspection and rejection device for printed packaging, characterized in that, It includes a feeding conveyor, a defective product conveyor, and a qualified product conveyor arranged in parallel. A material handling and transfer conveyor mechanism is arranged across the top of the feeding conveyor, the defective product conveyor, and the qualified product conveyor. The feeding conveyor is equipped with a first visual inspection component that takes pictures of the top, left, and right sides of the packaging box. The material handling and transfer conveyor mechanism is equipped with a second visual inspection component that takes pictures of the bottom, front, and rear sides of the packaging box. The material handling and conveying mechanism includes a horizontal seat, a closed-loop conveying assembly installed in the horizontal seat, and multiple adsorption material handling mechanisms connected at equal intervals to the closed-loop conveying assembly. Each adsorption material handling mechanism includes a strip plate, an adsorption box, and a lifting rod. The strip plate is connected to the closed-loop conveying assembly. The lifting rod passes through the strip plate, with an abutment wheel at one end and the other end connected to the adsorption box. A first spring is installed between the adsorption box and the strip plate. A suction cup is installed on the lower surface of the adsorption box. A piston plate is movably installed in the inner cavity of the adsorption box via a guide rod and a second spring. A magnetic block is installed at the upper end of the piston plate. An electromagnet is installed on the top wall of the adsorption box. Carbon brush blocks are electrically connected to the positive and negative terminals of the electromagnet in the circuit. The cross seat is also fixedly provided with a guide block that interacts with the abutment wheel. Both sides of the guide block are provided with conductive copper strips that slide in contact with the carbon brush block. The lower end of the guide block is provided with a downward pressing protrusion that is aligned with the position of the feeding conveyor. The starting end of the conductive copper strip extends from the bottom of the downward pressing protrusion all the way to the top of the qualified product conveyor. A rejection cylinder is provided on the cross seat at a position aligned with the unqualified product conveyor. The telescopic end of the rejection cylinder is connected to a pusher plate.
2. The online quality inspection and rejection device for printed packaging materials according to claim 1, characterized in that, The first visual inspection component and the second visual inspection component have the same structure, both including a U-shaped frame and three CCD cameras mounted on the U-shaped frame; the U-shaped frame in the first visual inspection component is fixed on the feeding conveyor, and its three CCD cameras are respectively positioned downward, left and right; the U-shaped frame in the second visual inspection component is inverted and fixed on the cross seat, and its three CCD cameras are respectively positioned upward, forward and backward.
3. The online quality inspection and rejection device for printed packaging materials according to claim 1, characterized in that, The closed-loop conveying assembly includes axles rotatably mounted on the left and right ends of the cross seat. Each axle has a drive wheel at both ends, and one axle is connected to a conveying power source at its end. A conveying component is provided between the two drive wheels that are aligned left and right. The two ends of the strip in the adsorption and gripping mechanism are respectively connected to the two conveying components.
4. The online quality inspection and rejection device for printed packaging materials according to claim 1, characterized in that, The positive and negative poles of the electromagnet connected to the circuit are respectively connected to two rigid rods that are vertically fixed to the upper surface of the adsorption box through wires. Each rigid rod is provided with a carbon brush block at the top, and the carbon brush block is supported by a spring at the top of the rigid rod to achieve vertical extension and retraction.
5. The online quality inspection and rejection device for printed packaging materials according to claim 1, characterized in that, The feeding end of the feeding conveyor is provided with a central guide plate. The two central guide plates are mirror-symmetrically arranged above the feeding end of the feeding conveyor, and the feeding ends of the two central guide plates are open.
6. The online quality inspection and rejection device for printed packaging materials according to claim 5, characterized in that, A horizontal plate is fixedly installed at the rear end of the feeding conveyor, and a limit baffle is installed in front of the horizontal plate. An adjusting screw connected to the limit baffle is threaded onto the horizontal plate.
7. The online quality inspection and rejection device for printed packaging materials according to claim 6, characterized in that, The feeding conveyor is a height-adjustable conveyor, used to adapt to packaging boxes of different thicknesses, and to keep the upper surface of the packaging box held at the same height by the adsorption and gripping mechanism.
8. The online quality inspection and rejection device for printed packaging materials according to claim 1, characterized in that, It also includes a control box, to which both the first and second vision detection components are electrically connected. The control box has a built-in processing module and is equipped with a display screen; and the signal output terminal of the control box is electrically connected to the rejection cylinder.