Packaging box printing quality detection device and detection method based on visual detection

Abstract

The invention relates to the technical field of packaging box inspection equipment, in particular to a packaging box printing quality detection device and method based on visual inspection. The detection device comprises a rack, and a detection table is arranged on the rack; a mounting rack is arranged on the detection table, and a first support arm and a second support arm which are perpendicular to each other are arranged on the mounting rack; a first guide rail and a second guide rail are respectively arranged on the first support arm and the second support arm, and the second support arm can slide along the first guide rail; a mounting seat is slidably mounted on the second guide rail, a first support and a second support are arranged on the mounting seat, the first support is connected with the mounting seat, the second support is rotatably connected with the first support, and a visual detection module is arranged on the second support; and a driving mechanism is arranged on the mounting seat. The function of controlling the shooting angle of the visual detection module is achieved, and the effect of comprehensively detecting the packaging box is achieved by flexibly adjusting the position of the visual detection module. The problem that debugging and maintenance difficulty is increased due to the fact that a plurality of industrial phases are installed is solved.

Description

Technical Field

[0001] This invention relates to the field of packaging box inspection equipment technology, specifically to a packaging box printing quality inspection device and method based on visual inspection. Background Technology

[0002] After the packaging boxes are printed and processed, a comprehensive inspection is usually required to ensure product quality. Traditional manual inspection is not only inefficient but also lacks accuracy, so industrial cameras are typically used for automated inspection. However, traditional industrial cameras have fixed angles during inspection. To comprehensively inspect the packaging boxes, multiple industrial cameras need to be set up, and their shooting angles adjusted according to the box dimensions. This adjustment process involves disassembling the industrial cameras, adjusting the shooting angles, and then reinstalling and fixing them, which is extremely cumbersome and time-consuming.

[0003] To address this, Chinese Patent CN118746550B discloses a packaging box printing quality inspection device. This device combines a conveying mechanism with horizontal movement and rotational adjustment to ensure comprehensive printing quality inspection of packaging boxes of different sizes during transport. This combination not only improves inspection efficiency and accuracy but also enhances the flexibility and adaptability of the production line. Due to the flexibility of horizontal movement and rotational adjustment, the inspection device can easily transition from inspecting a small packaging box to inspecting a large packaging box with simple parameter adjustments, eliminating the need for frequent replacement or adjustment of the inspection equipment.

[0004] However, traditional vision inspection devices typically rely on multiple industrial cameras to sequentially inspect packaging boxes at various angles or positions. This approach not only significantly increases the cost and complexity of the equipment itself, but also requires all cameras to capture the target synchronously and accurately in practical applications. Any deviation or error of any camera will affect the overall inspection reliability and result consistency, thus greatly increasing the difficulty of debugging and maintenance. When using a single industrial camera for inspection, a rotating industrial camera is usually used for comprehensive inspection. However, as the industrial camera rotates around a fixed center, the distance between the lens and the inspection surface continuously changes, resulting in progressive defocusing during tilted shooting. This significantly degrades the image quality, especially in the edge areas of the packaging box, affecting inspection accuracy. On the other hand, using a high-precision, fully free robotic arm to operate the movement of a single industrial camera is too costly. Summary of the Invention

[0005] To address the aforementioned issues, a visual inspection-based packaging box printing quality inspection device and method are provided. The device solves the problem of blurred edge imaging caused by the fixed rotation radius of traditional industrial cameras by using a frame, mounting bracket, mounting base, visual inspection module, and drive mechanism. Furthermore, the mechanism is simple, stable, and cost-controllable.

[0006] To address the problems of existing technologies, this invention provides a visual inspection-based packaging box printing quality inspection device, comprising a frame with an inspection table on the frame; a mounting frame on the inspection table, a mounting base on the mounting frame, a first support and a second support on the mounting base, the first support being connected to the mounting base, and the second support being rotatably connected to the first support, the second support having a visual inspection module; a drive mechanism for controlling the movement of the second support on the mounting base; the drive mechanism including a rotation drive component and a lifting component; the rotation drive component for driving the second support to rotate; the lifting component for controlling the first support to move vertically; in the working state, when the rotation drive component drives the second support to rotate, the lifting component controls the first support to move vertically downward.

[0007] Preferably, the mounting bracket is provided with a first arm and a second arm that are perpendicular to each other; the first arm and the second arm are respectively provided with a first guide rail and a second guide rail, and the second arm can slide along the first guide rail; the first bracket is provided with a first arc-shaped guide rail, and the second bracket is connected with a first fixed shaft that slides with the first arc-shaped guide rail.

[0008] Preferably, the lifting assembly includes a movable rod, a connecting rod, and an elastic element; the movable rod is provided with a guide rod that slides with the first bracket; both ends of the connecting rod are hinged to the guide rod and the mounting base, respectively; a limiting block is provided at the end of the guide rod away from the movable rod, and both ends of the elastic element are connected to the limiting block and the first bracket, respectively.

[0009] Preferably, the vision inspection module includes a base and an optical component; the base is movably mounted on a second support, and the optical component is mounted on the base; the second support is provided with a linear drive component for controlling the translation of the base.

[0010] Preferably, the testing platform is equipped with a belt conveyor for transporting packaging boxes.

[0011] Preferably, the rotary drive assembly includes a first rotary driver and a second rotating shaft; the first rotary driver is mounted on a first bracket and is used to drive the second rotating shaft to rotate; the second rotating shaft is rotatably mounted on the first bracket, the second bracket is connected to the second rotating shaft, and the axis of the first arc-shaped guide rail is collinear with the axis of the second rotating shaft.

[0012] Preferably, the first bracket is provided with a second arc-shaped guide rail, the axis of the second arc-shaped guide rail being collinear with the axis of the first arc-shaped guide rail; the second bracket is provided with a second fixed shaft that slides with the second arc-shaped guide rail.

[0013] Preferably, the linear drive assembly includes a second rotary driver, a screw, a connecting plate, and a guide bar; the second rotary driver is mounted on a second bracket; the screw is rotatably mounted on the second bracket; the connecting plate is connected to the base, and the second bracket is provided with a guide bar that slides in cooperation with the connecting plate.

[0014] Preferably, the second arm is equipped with a photoelectric sensor for detecting the position of the mounting base; the second bracket is equipped with a baffle that cooperates with the photoelectric sensor.

[0015] A method for inspecting the printing quality of packaging boxes includes the following steps: S1. Control the second arm and the mounting base to move along the first guide rail and the second guide rail respectively, adjust the position of the vision inspection module, and perform quality inspection on the upper surface of the packaging box; S2. When the vision inspection module moves to the side of the packaging box, the second bracket is rotated by the drive mechanism to adjust the shooting angle of the vision inspection module and shoot and inspect the side of the packaging box.

[0016] The advantages of this invention compared to the prior art are: 1. This invention, through a frame, mounting bracket, mounting base, vision inspection module, and drive mechanism, enables the rotating vision inspection module to automatically approach the inspection surface during tilting. By flexibly adjusting the position of the vision inspection module, it achieves comprehensive inspection of the packaging box. During the inspection of the packaging box, the rotation drive component drives the second bracket to rotate, adjusting the shooting angle to inspect the side of the packaging box. During the rotation of the second bracket, the lifting component controls the first bracket to move downwards vertically, which in turn drives the second bracket to move downwards synchronously, gradually controlling the vision inspection module to approach the inspection area. This maintains the shooting distance of the vision inspection module within a specified range, improving the clarity of the captured image. It solves the problem of blurred edge imaging caused by the fixed rotation radius of traditional industrial cameras, and the mechanism is simple, stable, and cost-effective. 2. This invention utilizes a first arm, a second arm, a first arc-shaped guide rail, and a first fixed shaft to control the shooting position of the visual inspection module. During the inspection process, the overall position of the visual inspection module is first adjusted using the first and second arms according to the size of the packaging box. Then, when shooting the side of the packaging box, the second bracket is guided to rotate via the first arc-shaped guide rail. Simultaneously, a lifting component controls the downward movement of the first bracket as the second bracket rotates. A drive mechanism controls the rotation of the second bracket, adjusting the shooting angle. Thus, a single visual inspection module can complete the comprehensive inspection of the packaging box. 3. This invention achieves the function of controlling the downward movement of the first and second supports during the rotation of the second support through a movable rod, a guide rod, a connecting rod, and an elastic element. When inspecting the side of the packaging box, the rotation drive assembly drives the second support to rotate. Simultaneously, the first fixed shaft on the second support pushes the movable rod to move, and the movable rod, guided by the guide rod, always moves horizontally. During the translation process, the movable rod and the guide rod push the connecting rod, and the guide rod is subjected to the thrust of the connecting rod, thereby controlling the downward movement of the first and second supports. The second support then drives the vision inspection module downward, achieving the effect of gradually lowering the vision inspection module during rotation. By bringing the vision inspection module closer to the inspection area, it allows for clear imaging of the easily damaged side. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the packaging box printing quality inspection device based on vision detection according to the present invention; Figure 2 This is a three-dimensional schematic diagram of the first arm, the second arm, and the drive mechanism of the packaging box printing quality inspection device based on vision inspection according to the present invention. Figure 3 This is a three-dimensional schematic diagram of the mounting base, visual inspection module and drive mechanism of the packaging box printing quality inspection device based on visual inspection of the present invention when the second support is in an inclined state. Figure 4 This is a three-dimensional schematic diagram of the mounting base, visual inspection module, and drive mechanism of the packaging box printing quality inspection device based on visual inspection of the present invention when the second support is in a vertical state. Figure 5 This is the invention Figure 4 A magnified view of a portion of point A in the middle; Figure 6 This is an exploded perspective view of the mounting base, visual inspection module, and drive mechanism of the packaging box printing quality inspection device based on visual inspection according to the present invention. Figure 7 This is the invention Figure 6 A magnified view of a portion of point B in the middle; Figure 8 This is an exploded perspective view of the second support, linear drive assembly, and visual inspection module of the packaging box printing quality inspection device based on visual inspection of the present invention. Figure 9 This is a three-dimensional schematic diagram of the second arm and mounting base of the visual inspection-based packaging box printing quality inspection device of the present invention. Figure 10 This is the invention Figure 9 A magnified view of a portion of point C.

[0018] The diagram is labeled as follows: 1. Frame; 11. Inspection table; 12. Belt conveyor; 2. Mounting frame; 21. First support arm; 211. First guide rail; 22. Second support arm; 221. Second guide rail; 222. Photoelectric sensor; 3. Mounting base; 31. First bracket; 311. First arc-shaped guide rail; 312. Second arc-shaped guide rail; 32. Second bracket; 321. First fixed shaft; 322. Second fixed shaft; 33. Fixing frame; 331. First rotating shaft; 34. Baffle; 4. Vision inspection module; 41. Base 42. Optical assembly; 5. Drive mechanism; 51. Rotary drive assembly; 511. First rotary driver; 512. Second rotating shaft; 513. Third rotating shaft; 514. Bevel gear; 515. First rotary gear; 516. Second rotary gear; 52. Lifting assembly; 521. Movable rod; 5211. Guide rod; 522. Connecting rod; 523. Elastic element; 53. Linear drive assembly; 531. Second rotary driver; 532. Screw; 533. Connecting plate; 534. Guide bar; 6. Packaging box. Detailed Implementation

[0019] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-3 A visual inspection-based packaging box printing quality inspection device includes a frame 1 with an inspection table 11 on it; a mounting frame 2 on the inspection table 11, a mounting base 3 on the mounting frame 2, a first support 31 and a second support 32 on the mounting base 3, the first support 31 being connected to the mounting base 3, and the second support 32 being rotatably connected to the first support 31, with a visual inspection module 4 on the second support 32; a drive mechanism 5 for controlling the movement of the second support 32 on the mounting base 3; the drive mechanism 5 includes a rotation drive component 51 and a lifting component 52; the rotation drive component 51 drives the second support 32 to rotate; the lifting component 52 controls the first support 31 to move vertically; in operation, when the rotation drive component 51 drives the second support 32 to rotate, the lifting component 52 controls the first support 31 to move vertically downward.

[0021] This invention, through a frame 1, mounting bracket 2, mounting base 3, vision inspection module 4, and drive mechanism 5, enables the rotating vision inspection module 4 to automatically approach the inspection surface during tilting. By flexibly adjusting the position of the vision inspection module 4, it achieves comprehensive inspection of the packaging box 6. During the inspection of the packaging box 6, the rotation drive component 51 drives the second bracket 32 ​​to rotate, adjusting the shooting angle to inspect the side of the packaging box 6. During the rotation of the second bracket 32, the lifting component 52 controls the first bracket 31 to move downwards vertically. The first bracket 31, in turn, drives the second bracket 32 ​​to move downwards synchronously, gradually controlling the vision inspection module 4 to approach the inspection area. This maintains the shooting distance of the vision inspection module 4 within a specified range, improving the clarity of the captured image. This solves the problem of blurred edge imaging caused by the fixed rotation radius of traditional industrial cameras. During operation, when the rotary drive assembly 51 drives the second bracket 32 ​​to rotate, the lifting assembly 52 controls the first bracket 31 to move downwards in the vertical direction. The function of this device is to achieve coordinated movement of the rotation of the second bracket 32 ​​and the lifting of the first bracket 31 through the rotary drive assembly 51 and the lifting assembly 52. ​​The second bracket 32 ​​is guided to rotate by the first arc-shaped guide rail 311, and the lifting assembly 52 controls the first bracket 31 to move downwards while the second bracket 32 ​​is rotating. The first bracket 31 will drive the second bracket 32 ​​to move downwards synchronously, thereby gradually controlling the visual inspection module 4 to move closer to the inspection area, improving the clarity of the captured image, and thus improving the inspection accuracy.

[0022] Reference Figures 3-5 The mounting bracket 2 is provided with a first arm 21 and a second arm 22 that are perpendicular to each other; the first arm 21 and the second arm 22 are respectively provided with a first guide rail 211 and a second guide rail 221, and the second arm 22 can slide along the first guide rail 211; the first bracket 31 is provided with a first arc-shaped guide rail 311, and the second bracket 32 ​​is connected with a first fixed shaft 321 that slides with the first arc-shaped guide rail 311.

[0023] This invention achieves the function of smooth angle adjustment of the vision detection module 4 through the first arc-shaped guide rail 311, the first fixed shaft 321, the rotary drive assembly 51, and the lifting assembly 52. ​​The first guide rail 211 and the second guide rail 221 are both electric guide rails equipped with lead screws and motors. The first guide rail 211 and the second guide rail 221 are used to control the mounting base 3 to move laterally and vertically along the horizontal plane, respectively. During operation, when inspecting the packaging box 6, the overall position of the vision inspection module 4 is first adjusted according to the size of the packaging box 6 by sliding the second support arm 22 along the first guide rail 211 and the mounting base 3 along the second guide rail 221. Then, when shooting the side of the packaging box 6, the second bracket 32 ​​is rotated by the drive mechanism 5 to adjust the shooting angle. Thus, a single vision inspection module 4 can complete the comprehensive inspection of the packaging box. The shooting angle of the vision inspection module 4 is controlled by the cooperation of the frame 1, the mounting bracket 2, the mounting base 3, the vision inspection module 4, and the drive mechanism 5. Then, the position of the vision inspection module 4 is flexibly adjusted to achieve the effect of comprehensive inspection of the packaging box 6. Only one vision inspection module 4 is needed to complete the all-round inspection.

[0024] Reference Figure 3 and Figure 4 The lifting assembly 52 includes a movable rod 521, a connecting rod 522, and an elastic element 523. The movable rod 521 is provided with a guide rod 5211 that slides with the first bracket 31. The two ends of the connecting rod 522 are respectively hinged to the guide rod 5211 and the mounting base 3. A limiting block is provided at the end of the guide rod 5211 away from the movable rod 521. The two ends of the elastic element 523 are respectively connected to the limiting block and the first bracket 31.

[0025] This invention achieves the function of controlling the downward movement of the first and second supports 31 and 32 when the second support 32 rotates through the movable rod 521, guide rod 5211, connecting rod 522, and elastic element 523. The mounting base 3 is provided with a fixed frame 33, which is equipped with a first rotating shaft 331. The guide rod 5211 is equipped with a hinge shaft, and the two ends of the connecting rod 522 are hinged to the first rotating shaft 331 and the hinge shaft, respectively. When inspecting the side of the packaging box 6, the rotation drive assembly 51 drives the second support 32 to rotate, and the second support 32 drives the first fixed shaft 321 to rotate synchronously. Furthermore, the rotational stability of the second support 32 is improved by the guidance of the first arc-shaped guide rail 311. Simultaneously, the first fixed shaft 321 on the second support 32 pushes the movable rod 521 to move, and the movable rod 521 always moves horizontally under the guidance of the guide rod 5211. During translation, the movable rod 521 and guide rod 5211 push the connecting rod 522. One end of the connecting rod 522 is hinged to the first rotating shaft 331 on the fixed frame 33. The fixed frame 33 is in a fixed state, and the guide rod 5211 is pushed by the connecting rod 522, thereby controlling the first bracket 31 and the second bracket 32 ​​to move downward. The second bracket 32 ​​will drive the vision inspection module 4 to move downward, achieving the effect of controlling the vision inspection module 4 to gradually move downward during rotation. By bringing the vision inspection module 4 closer to the inspection area, the vulnerable side can be clearly photographed.

[0026] Reference Figure 3 and Figure 4 The visual inspection module 4 includes a base 41 and an optical component 42; the base 41 is movably mounted on the second bracket 32, and the optical component 42 is mounted on the base 41; the second bracket 32 ​​is provided with a linear drive component 53 for controlling the translation of the base 41.

[0027] This invention achieves the function of controlling the extension and retraction of the base 41 through the base 41, optical component 42, and linear drive component 53. While the lifting component 52 and rotation drive component 51 work together to control the optical component 42 to approach the detection area, there may still be small areas that are difficult to photograph for packaging boxes 6 of different sizes. During the detection process, when a blurry area appears in the image captured by the optical component 42, the linear drive component 53 controls the base 41 to extend, and the base 41 moves the optical component 42 closer to the blurry area, thus achieving a manual focusing effect. Furthermore, before the rotation drive component 51 controls the rotation of the second support 32, the linear drive component 53 can control the extension and retraction of the base 41 to adjust the rotation radius of the optical component 42, thereby adjusting the rotation speed of the optical component 42, thus adapting to packaging boxes 6 of different structures and sizes and improving the stability of quality inspection.

[0028] Reference Figure 1 The testing station 11 is equipped with a belt conveyor 12 for conveying the packaging boxes 6.

[0029] This invention achieves the function of automatically conveying packaging boxes 6 through a belt conveyor 12. One end of the second arm 22 slides in engagement with the first guide rail 211. To improve the stability of the second arm 22, its length needs to be controlled. Therefore, the travel distance of the mounting base 3 along the second guide rail 221 is limited. For this purpose, the belt conveyor 12 is provided, which not only enables automatic loading and unloading via its conveyor belt, but also controls the movement of the packaging boxes 6 to align the optical component 42 with the side of the packaging box 6, allowing the detection device to detect packaging boxes 6 of different lengths.

[0030] Reference Figure 2 , Figure 6 and Figure 7 The rotary drive assembly 51 includes a first rotary driver 511 and a second rotating shaft 512. The first rotary driver 511 is mounted on the first bracket 31 and is used to drive the second rotating shaft 512 to rotate. The second rotating shaft 512 is rotatably mounted on the first bracket 31. The second bracket 32 ​​is connected to the second rotating shaft 512. The axis of the first arc-shaped guide rail 311 is collinear with the axis of the second rotating shaft 512.

[0031] This invention achieves the function of driving the rotation of the second bracket 32 ​​through a first rotary driver 511 and a second rotating shaft 512. The second bracket 32 ​​is provided with a third rotating shaft 513, and a bevel gear 514 is sleeved on the driving end of both the third rotating shaft 513 and the first rotary driver 511, with the two bevel gears 514 meshing together. A first rotating gear 515 and a second rotating gear 516 are respectively sleeved on the second rotating shaft 512 and the third rotating shaft 513, with the first rotating gear 515 and the second rotating gear 516 meshing together. In the working state, when the optical component 42 is aligned with the side of the packaging box 6, the first rotary driver 511 is activated. The first rotary driver 511 drives the third rotating shaft 513 to rotate through the bevel gears 514. The third rotating shaft 513 drives the second rotating gear 516 to rotate, and the second rotating gear 516 drives the first rotating gear 515, which meshes with it, to rotate. The first rotating gear 515 drives the second rotating shaft 512 to rotate. When the second rotating shaft 512 rotates, it drives the second bracket 32 ​​to rotate synchronously.

[0032] Reference Figures 3-5 The first bracket 31 is provided with a second arc-shaped guide rail 312, the axis of the second arc-shaped guide rail 312 is collinear with the axis of the first arc-shaped guide rail 311; the second bracket 32 ​​is provided with a second fixed shaft 322 that slides with the second arc-shaped guide rail 312.

[0033] This invention achieves the function of guiding the rotation of the second support 32 through the second arc-shaped guide rail 312 and the second fixed shaft 322. Supporting the second support 32 solely by the second rotating shaft 512 is not stable enough; therefore, the first arc-shaped guide rail 311 and the first fixed shaft 321 are provided. However, the first fixed shaft 321 still needs to push the movable rod 521 during rotation, thus encountering some resistance. To further improve the rotational stability of the second support 32 and prevent the first fixed shaft 321 from jamming, the second arc-shaped guide rail 312 and the second fixed shaft 322 are provided to further guide the rotation of the second support 32 and improve its rotational stability.

[0034] Reference Figure 3 and Figure 8 The linear drive assembly 53 includes a second rotary driver 531, a screw 532, a connecting plate 533, and a guide bar 534. The second rotary driver 531 is mounted on the second bracket 32. The screw 532 is rotatably mounted on the second bracket 32. The connecting plate 533 is connected to the base 41, and the second bracket 32 ​​is provided with a guide bar 534 that slides with the connecting plate 533.

[0035] This invention achieves the function of controlling the extension and retraction of the base 41 through a second rotary actuator 531, a screw 532, a connecting plate 533, and guide bars 534. Two guide bars 534 are provided, respectively distributed on both sides of the second bracket 32. When controlling the extension and retraction of the base 41 and the optical component 42, the second rotary actuator 531 is activated, driving the screw 532 to rotate. The screw 532 then drives the connecting plate 533, which is threadedly connected to it, to move. The connecting plate 533 then moves the base 41 and the optical component 42, thus controlling the extension and retraction of the base 41 and the optical component 42.

[0036] Reference Figure 9 and Figure 10 The second arm 22 is equipped with a photoelectric sensor 222 for detecting the position of the mounting base 3; the second bracket 32 ​​is equipped with a baffle 34 that cooperates with the photoelectric sensor 222.

[0037] This invention achieves precise control of the movement of the mounting base 3 through the photoelectric sensor 222. After the detection is completed, the mounting base 3 is moved closer to the photoelectric sensor 222 by the lead screw on the second guide rail 221. When the baffle 34 on the second bracket 32 ​​blocks the light signal emitted by the photoelectric sensor 222, the movement of the mounting base 3 stops, thereby precisely controlling the movement of the mounting base 3 and improving the control accuracy of the position of the optical component 42.

[0038] Reference Figures 1-5 A method for inspecting the printing quality of packaging boxes, comprising the following steps: S1. Control the second support arm 22 and the mounting base 3 to move along the first guide rail 211 and the second guide rail 221 respectively, adjust the position of the vision inspection module 4, and perform quality inspection on the upper surface of the packaging box 6. S2. When the visual inspection module 4 moves to the side of the packaging box 6, the second bracket 32 ​​is rotated by the drive mechanism 5 to adjust the shooting angle of the visual inspection module 4 and shoot and inspect the side of the packaging box 6.

[0039] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A packaging box printing quality inspection device based on vision inspection, characterized in that, The system includes a frame (1), on which a testing platform (11) is provided; a mounting frame (2) is provided on the testing platform (11); a mounting base (3) is provided on the mounting frame (2), and a first bracket (31) and a second bracket (32) are provided on the mounting base (3). The first bracket (31) is connected to the mounting base (3), and the second bracket (32) is rotatably connected to the first bracket (31). A vision inspection module (4) is provided on the second bracket (32); a drive mechanism (5) for controlling the movement of the second bracket (32) is provided on the mounting base (3); the drive mechanism (5) includes a rotary drive assembly (51) and a lifting assembly (52); the rotary drive assembly (51) is used to drive the second bracket (32) to rotate; the lifting assembly (52) is used to control the first bracket (31) to rise and fall in the vertical direction; in the working state, when the rotary drive assembly (51) drives the second bracket (32) to rotate, the lifting assembly (52) controls the first bracket (31) to move downward in the vertical direction.

2. The packaging box printing quality inspection device based on vision inspection according to claim 1, characterized in that, The mounting bracket (2) is provided with a first arm (21) and a second arm (22) that are perpendicular to each other; the first arm (21) and the second arm (22) are respectively provided with a first guide rail (211) and a second guide rail (221), and the second arm (22) can slide along the first guide rail (211); the first bracket (31) is provided with a first arc-shaped guide rail (311), and the second bracket (32) is connected with a first fixed shaft (321) that slides with the first arc-shaped guide rail (311).

3. The packaging box printing quality inspection device based on vision inspection according to claim 2, characterized in that, The lifting assembly (52) includes a movable rod (521), a connecting rod (522), and an elastic element (523); the movable rod (521) is provided with a guide rod (5211) that slides with the first bracket (31); the two ends of the connecting rod (522) are respectively hinged to the guide rod (5211) and the mounting base (3); a limiting block is provided at the end of the guide rod (5211) away from the movable rod (521), and the two ends of the elastic element (523) are respectively connected to the limiting block and the first bracket (31).

4. The packaging box printing quality inspection device based on vision inspection according to claim 1, characterized in that, The visual inspection module (4) includes a base (41) and an optical component (42); the base (41) is movably mounted on a second bracket (32), and the optical component (42) is mounted on the base (41); the second bracket (32) is provided with a linear drive component (53) for controlling the translation of the base (41).

5. The packaging box printing quality inspection device based on vision inspection according to claim 1, characterized in that, The testing station (11) is equipped with a belt conveyor (12) for conveying the packaging boxes (6).

6. The packaging box printing quality inspection device based on vision inspection according to claim 2, characterized in that, The rotary drive assembly (51) includes a first rotary driver (511) and a second rotating shaft (512); the first rotary driver (511) is mounted on a first bracket (31) and is used to drive the second rotating shaft (512) to rotate; the second rotating shaft (512) is rotatably mounted on the first bracket (31), the second bracket (32) is connected to the second rotating shaft (512), and the axis of the first arc-shaped guide rail (311) is collinear with the axis of the second rotating shaft (512).

7. The packaging box printing quality inspection device based on vision inspection according to claim 2, characterized in that, The first bracket (31) is provided with a second arc-shaped guide rail (312), the axis of the second arc-shaped guide rail (312) is collinear with the axis of the first arc-shaped guide rail (311); the second bracket (32) is provided with a second fixed shaft (322) that slides with the second arc-shaped guide rail (312).

8. The packaging box printing quality inspection device based on vision inspection according to claim 4, characterized in that, The linear drive assembly (53) includes a second rotary driver (531), a screw (532), a connecting plate (533), and a guide bar (534); the second rotary driver (531) is mounted on a second bracket (32); the screw (532) is rotatably mounted on the second bracket (32); the connecting plate (533) is connected to the base (41), and the second bracket (32) is provided with a guide bar (534) that slides with the connecting plate (533).

9. The packaging box printing quality inspection device based on vision inspection according to claim 1, characterized in that, The second arm (22) is equipped with a photoelectric sensor (222) for detecting the position of the mounting base (3); the second bracket (32) is equipped with a baffle (34) that cooperates with the photoelectric sensor (222).

10. A method for inspecting the printing quality of packaging boxes, using the visual inspection-based packaging box printing quality inspection device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Control the second arm (22) and the mounting base (3) to move along the first guide rail (211) and the second guide rail (221) respectively, adjust the position of the vision inspection module (4), and perform quality inspection on the upper surface of the packaging box (6); S2. When the visual inspection module (4) moves to the side of the packaging box (6), the second bracket (32) is rotated by the drive mechanism (5) to adjust the shooting angle of the visual inspection module (4) and shoot the side of the packaging box (6).

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