Visual inspection device for printed matters

Abstract

A presswork visual inspection device disclosed by the present invention comprises an equipment box, a rectangular rubber sheet is fixed in a dust collection box, a connection plate is fixed in the rectangular rubber sheet, a plurality of dust collection pipes are arranged on the connection plate in an up-down penetrating manner, and a movable baffle plate matched with a movable plate for use is arranged on the dust collection box in a penetrating manner. An air bag capable of blocking the dust collection pipe is fixed to the bottom of the movable baffle, the visual detection range of the detection camera can be changed by adjusting the height of the detection camera, meanwhile, the movable baffle and the air bag are driven to move, the number of blocked dust collection pipes is changed, and the intensity of negative pressure dust collection of the dust collection pipes is changed. By adjusting the height of the detection camera, any tiny defects can be accurately detected, and no matter errors and omissions of Chinese and English characters, picture blurring, printing chromatic aberration or bar code errors exist. And after the detection is completed, the computer generates a detailed report, so that the printing quality can be clear at a glance.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology for printed materials, and more particularly to a visual inspection device for printed materials. Background Technology

[0002] Printed materials are a general term for various finished products produced using printing technology. For example, printed materials on packaging boxes require inspection of their surface printing quality after printing. Specifically, this involves using an inspection camera to capture and inspect the pattern on the printed material. For instance, the printing defect detection device with application number CN119413813B can control the distance between the visual inspection camera and the printed material according to the width of the printed material, thereby facilitating the inspection of the complete printed image.

[0003] However, in actual printing inspection, most printed materials are sampled rather than inspected entirely. When inspecting printed materials using the existing technology, the leveling motor starts when the front end of the printed material moves to the leveling roller, and the rotating roller presses the front end of the printed material to flatten it on the upper surface of the conveyor belt table. Although the printed material is leveled, this causes deformation, which can lead to false detections by the inspection equipment, affecting the quality and efficiency of subsequent printing. Without the leveling roller's limiting function, vibrations during material movement and dust on the surface can also cause false detections. Therefore, this application proposes a visual inspection device for printed materials. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems by providing a visual inspection device for printed materials.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A visual inspection device for printed materials includes an equipment box, on which a computer is mounted. An inspection platform is located at the top of the equipment box, and multiple negative pressure suction holes for adsorbing printed materials are provided through the inspection platform. A movable stage is movably connected to the equipment box. The movable stage has an internal cavity, within which a movable plate capable of vertical movement is located. A connecting frame is mounted at the bottom of the movable plate, and an inspection camera is mounted at the bottom of the connecting frame. A dust collection box is installed within the internal cavity, and a rectangular rubber sheet is fixed inside the dust collection box. A connecting plate is fixed inside the rectangular rubber sheet, and multiple suction pipes are provided vertically through the connecting plate. A movable baffle, used in conjunction with the movable plate, is provided through the dust collection box. An airbag for blocking the suction pipes is fixed at the bottom of the movable baffle. By adjusting the height of the inspection camera, the visual inspection range of the camera can be changed, and the movable baffle and airbag can be moved simultaneously, changing the number of suction pipes blocked and altering the intensity of the negative pressure suction.

[0007] Preferably, the testing platform has two L-shaped grooves that communicate with the equipment box. An L-shaped plate is slidably connected in the L-shaped grooves. A movable frame is fixed on the L-shaped plate. A piston cylinder is fixed in the equipment box. A movable piston is slidably connected in the piston cylinder. A movable rod is fixedly connected to the movable piston. The movable rod is fixedly connected to the movable frame. A filtration mechanism is provided between the piston cylinder and the negative pressure adsorption hole.

[0008] Preferably, the filtration mechanism includes a connecting cover fixed inside the equipment box and covering the outside of the negative pressure adsorption hole. A dust filter box is installed inside the equipment box, and a dust filter screen is fixed inside the dust filter box. The dust filter box is connected to the connecting cover through a connecting pipe. The piston cylinder is connected to the dust filter box through a suction pipe. The connecting pipe and the suction pipe are located on the same side of the dust filter screen.

[0009] Preferably, an installation plate is fixedly connected inside the inner cavity, an electric push rod is fixedly connected to the installation plate, a drive rod is fixedly connected to the output end of the electric push rod, and the lower end of the drive rod is fixedly connected to the upper end of the moving plate.

[0010] Preferably, two brackets are fixed at both ends of the dust collection box, and the brackets are fixedly connected to the inner wall of the inner cavity.

[0011] Preferably, the dust collection box has a through groove, the movable baffle passes through the through groove and is slidably connected to it, a connecting plate is fixed on the movable baffle, and two springs are fixed on the connecting plate, the springs being fixedly connected to the dust collection box.

[0012] Preferably, the movable baffle is provided with a through hole, and a pull rope is passed through the through hole. One end of the pull rope is fixedly connected to the dust collection box, and the other end of the pull rope is fixedly connected to the movable plate. A guide rod is fixed to the inner wall of the inner cavity, and the pull rope is wound around the guide rod.

[0013] Preferably, the dust filter box is connected to two hoses, which are located on one side of the dust filter and opposite to the connecting pipe. The hoses pass through the L-shaped plate. The upper end of the dust collection box is connected to a connecting pipe, which is equipped with a one-way valve. The connecting pipe is connected to the hoses.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows:

[0015] 1. After the inspection camera completes a comprehensive inspection of the cardboard, it transmits the inspection data to the computer. The computer performs a detailed comparative analysis of the inspection data with pre-imported standard images or PDF originals, generating a comprehensive report. This report allows operators to clearly understand the printing quality of the cardboard, quickly and accurately determine whether the cardboard is qualified, and identify any specific problems, providing a strong basis for subsequent quality control and production improvement. The entire inspection process is highly automated, with all components working collaboratively to ensure the accuracy and efficiency of cardboard printing quality inspection.

[0016] 2. Under negative pressure, air passes through the negative pressure adsorption hole, connecting cover, and connecting pipe into the dust filter box, and then enters the piston cylinder through the suction pipe, thereby forming a negative pressure at the negative pressure adsorption hole, firmly adsorbing the cardboard onto the testing platform, ensuring the stability of the cardboard position during the testing process, and thus ensuring the accuracy of subsequent testing.

[0017] 3. By adjusting the height of the detection camera, its visual detection range can be changed, enabling comprehensive detection of cardboard of different sizes.

[0018] 4. During the up-and-down movement of the suction adjustment plate, one end of the pull rope is fixedly connected to the moving plate, and the other end is fixedly connected to the dust collection box. The pull rope is wrapped around a guide rod fixed to the inner wall of the cavity. The movement of the moving plate will pull the pull rope. The pull rope passes through the through hole provided in the movable baffle. Under the pulling action of the pull rope, the movable baffle slides along the through groove provided in the dust collection box.

[0019] 5. When the moving plate moves upward, the height of the detection camera increases, and the detection area increases. Driven by the pull rope, the two moving plates can move in opposite directions. This reduces the number of airbags blocking the suction pipes, allowing the suction pipes to cover the cardboard and thus thoroughly remove dust from the cardboard. At the same time, the increased number of suction pipes reduces the negative pressure in the dust collection box. The suction pipes and connecting plates move downward due to gravity. At this time, the rectangular rubber sheet deforms, and the suction pipes are placed close to the cardboard. Due to the relatively low negative pressure suction, the close proximity to the cardboard allows for more effective dust removal without affecting the cardboard being suctioned, preventing it from moving.

[0020] 6. When the moving plate moves downwards, the height of the detection camera decreases, and the detection area decreases, allowing for the detection of small areas of cardboard. Driven by the spring force, the two moving plates can move relative to each other. This increases the number of airbags blocking the suction pipes, but the suction pipes can still cover the cardboard, thus achieving comprehensive dust removal. At the same time, the number of suction pipes used decreases, increasing the negative pressure intensity in the suction box. Due to the reduced number of suction pipes and the fixed air intake area, air intake through the suction pipes causes the rectangular rubber sheet to deform, moving the suction pipes and connecting plates away from the cardboard. Because the negative pressure suction is relatively increased and away from the cardboard, the suction function is ensured without affecting the suctioned cardboard, preventing it from moving and thus ensuring the accuracy of subsequent detection.

[0021] 7. The increased distance between the suction pipe and the cardboard after the suction pipe moves upward increases the air intake space of the suction pipe; thus, regardless of whether the suction pipe is set upward or downward, the negative pressure suction hole will be within a suitable negative pressure suction range, thereby limiting the cardboard and protecting it.

[0022] 8. The adsorbed dust is transported through the suction pipe and dust box to the connecting pipe, and finally through the hose to the dust filter box. The air is filtered through the dust filter screen and then enters the piston cylinder, thus achieving the dust removal and collection treatment of the cardboard.

[0023] 9. Next, the moving platform is reset, causing the moving piston to squeeze the air in the piston cylinder. Due to the one-way valve, the air can only be discharged through the negative pressure suction hole, which can blow the cardboard up for easy handling by the staff.

[0024] In summary, this invention, through an adjustable height detection camera, can accurately detect any minute defects, whether it be errors in Chinese or English text, blurry images, color differences in printing, or barcode errors; after the detection is completed, the computer will generate a detailed report, providing a clear overview of the printing quality. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the structure of a visual inspection device for printed materials proposed in this invention;

[0026] Figure 2 This is a rear view of a visual inspection device for printed materials proposed in this invention;

[0027] Figure 3 This is a cross-sectional side view of a visual inspection device for printed materials proposed in this invention;

[0028] Figure 4 This is a cross-sectional view of the equipment box in a visual inspection device for printed materials proposed in this invention;

[0029] Figure 5 This is a schematic diagram of the piston cylinder in a visual inspection device for printed materials proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the dust filter in a visual inspection device for printed materials proposed in this invention.

[0031] Figure 7 This is a cross-sectional schematic diagram of the moving stage in a visual inspection device for printed materials proposed in this invention.

[0032] Figure 8 This is a schematic diagram of the spring in a visual inspection device for printed materials proposed in this invention.

[0033] Figure 9 This is a cross-sectional front view of the moving stage in a visual inspection device for printed materials proposed in this invention;

[0034] Figure 10 This is a schematic diagram of the internal structure of the dust collection box in a visual inspection device for printed materials proposed in this invention;

[0035] Figure 11 This is a schematic diagram of the moving plate in a visual inspection device for printed materials proposed in this invention.

[0036] In the diagram: 1 Equipment box, 2 Testing table, 3 Negative pressure adsorption hole, 4 Computer, 5 Moving stage, 6 Connecting cover, 7 Dust filter box, 8 Piston cylinder, 9 Moving piston, 10 Moving frame, 11 L-shaped plate, 12 Hose, 13 Suction pipe, 14 One-way valve, 15 L-shaped groove, 16 Moving rod, 17 Connecting pipe, 18 Dust filter screen, 19 Inner cavity, 20 Electric push rod, 21 Mounting plate, 22 Drive rod, 23 Moving plate, 24 Connecting frame, 25 Testing camera, 26 Dust collection box, 27 Dust collection pipe, 28 Connecting pipe, 29 Guide rod, 31 Bracket, 32 Connecting plate, 33 Through hole, 34 Movable baffle, 35 Pull rope, 36 Spring, 37 Connecting plate, 38 Through groove, 39 Airbag, 40 Rectangular rubber sheet. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Reference Figures 1-11 A visual inspection device for printed materials includes an equipment box 1, on which a computer 4 is installed. The interaction between the computer 4 and the inspection camera 25 is further explained as follows: First, a standard image or PDF original is imported into the computer 4. Then, the cardboard is placed flat on the inspection area (at the negative pressure suction hole 3) of the inspection table 2. Pressing the start button begins operation. The inspection camera 25 can accurately detect even the smallest defects, whether it be errors in Chinese or English text, blurry images, color differences in printing, or barcode errors. After inspection, the computer 4 generates a detailed report, providing a clear overview of the printing quality.

[0039] The upper end of the equipment box 1 is provided with a testing platform 2. Multiple negative pressure adsorption holes 3 are provided through the testing platform 2 to adsorb printed materials. Two L-shaped grooves 15 connected to the equipment box 1 are provided through the testing platform 2. An L-shaped plate 11 is slidably connected in the L-shaped grooves 15.

[0040] A movable frame 10 is fixed on the L-shaped plate 11, a piston cylinder 8 is fixed inside the equipment box 1, a movable piston 9 is slidably connected inside the piston cylinder 8, a movable rod 16 is fixedly connected to the movable piston 9, the movable rod 16 is fixedly connected to the movable frame 10, and a filter mechanism is provided between the piston cylinder 8 and the negative pressure adsorption hole 3; the movement of the movable piston 9 can cause negative pressure to appear inside the piston cylinder 8, and then negative pressure to appear inside the negative pressure adsorption hole 3.

[0041] The filtration mechanism includes a connecting cover 6 fixed inside the equipment box 1 and covering the negative pressure adsorption hole 3. A dust filter box 7 is installed inside the equipment box 1. A dust filter screen 18 is fixed inside the dust filter box 7. The dust filter box 7 is connected to the connecting cover 6 through a connecting pipe 17. A piston cylinder 8 is connected to the dust filter box 7 through a suction pipe 13. The connecting pipe 17 and the suction pipe 13 are located on the same side of the dust filter screen 18.

[0042] A movable stage 5 is movably connected to the equipment box 1. An electric slide rail and an electric slider are installed inside the equipment box 1. The electric slider slides on the electric slide rail, and the movable stage 5 is fixed on the electric slider, thus driving the movable stage 5 to move.

[0043] The movable stage 5 has an inner cavity 19, and a movable plate 23 that can move up and down is provided inside the inner cavity 19. An installation plate 21 is fixedly connected inside the inner cavity 19, and an electric push rod 20 is fixedly connected to the installation plate 21. A drive rod 22 is fixedly connected to the output end of the electric push rod 20, and the lower end of the drive rod 22 is fixedly connected to the upper end of the movable plate 23.

[0044] A connecting frame 24 is installed at the bottom of the movable plate 23, and a detection camera 25 is installed at the bottom of the connecting frame 24. A dust collection box 26 is installed inside the inner cavity 19. Two brackets 31 are fixed at both ends of the dust collection box 26, and the brackets 31 are fixedly connected to the inner wall of the inner cavity 19.

[0045] The dust collection box 7 is connected to two hoses 12. The hoses 12 are located on one side of the dust filter 18 and opposite to the connecting pipe 17. The hoses 12 pass through the L-shaped plate 11. The upper end of the dust collection box 26 is connected to the connecting pipe 28. A one-way valve 14 is installed on the connecting pipe 28. The connecting pipe 28 is connected to the hoses 12. The one-way valve 14 only allows air from the dust collection box 26 to flow into the connecting pipe 28.

[0046] A rectangular rubber sheet 40 is fixed inside the dust collection box 26, and a connecting plate 37 is fixed inside the rectangular rubber sheet 40. The rectangular rubber sheet 40 is sealed and fixedly connected to the dust collection box 26 and the connecting plate 37, and the rectangular rubber sheet 40 has a certain deformation and repositioning ability.

[0047] Multiple suction pipes 27 are provided vertically through the connecting plate 37. A movable baffle 34 for use with the movable plate 23 is provided through the dust collection box 26. A through groove 38 is provided through the dust collection box 26. The movable baffle 34 passes through the through groove 38 and is slidably connected to it. A connecting plate 32 is fixed on the movable baffle 34. Two springs 36 are fixed on the connecting plate 32. The springs 36 are fixedly connected to the dust collection box 26. An airbag 39 that can block the suction pipes 27 is fixed at the bottom of the movable baffle 34. The airbag 39 is used to block the suction pipes 27 and can adapt to the suction pipes 27 moving up and down with the connecting plate 37 by deformation.

[0048] Adjusting the height of the detection camera 25 can change the visual detection range of the detection camera 25, while driving the movable baffle 34 and airbag 39 to move, changing the number of blockages on the suction pipe 27 and changing the intensity of negative pressure suction of the suction pipe 27.

[0049] A through hole 33 is provided on the movable baffle 34, and a pull rope 35 is passed through the through hole 33. One end of the pull rope 35 is fixedly connected to the dust collection box 26, and the other end of the pull rope 35 is fixedly connected to the movable plate 23. A guide rod 29 is fixedly fixed on the inner wall of the inner cavity 19, and the pull rope 35 is wound around the guide rod 29.

[0050] This visual inspection device for printed materials is mainly used for precise inspection of the printing quality of cardboard. Its working process covers multiple stages, including inspection preparation, adsorption and fixation, inspection execution, dust collection adjustment, and result generation, as detailed below:

[0051] First, import the standard image or PDF original into the computer 4 installed on the equipment box 1 to provide a benchmark for subsequent printing quality comparison.

[0052] The cardboard to be tested is placed flat in the testing area of ​​the testing table 2, specifically at the negative pressure suction hole 3. An electric slide rail inside the equipment box 1 drives an electric slider to move, which in turn moves the moving stage 5 fixed to the electric slider, preparing it for subsequent testing by the testing camera 25.

[0053] The moving stage 5 moves, causing the L-shaped plate 11 to move. The moving L-shaped plate 11 moves, causing the moving rod 16 and the moving piston 9 to move. The moving piston 9 moves inside the piston cylinder 8, creating a negative pressure inside the piston cylinder 8. Since the piston cylinder 8 is connected to the dust filter box 7 through the suction pipe 13, and the suction pipe 13 is equipped with a one-way valve 14 (which only allows air to flow through the air in the suction pipe 13 into the piston cylinder 8), and the dust filter box 7 is connected to the connecting cover 6 covering the outside of the negative pressure adsorption hole 3 through the connecting pipe 17, under the action of negative pressure, air passes through the negative pressure adsorption hole 3, the connecting cover 6, and the connecting pipe 17 in sequence to enter the dust filter box 7, and then enters the piston cylinder 8 through the suction pipe 13, thereby forming a negative pressure at the negative pressure adsorption hole 3, firmly adsorbing the cardboard onto the detection stage 2, ensuring the stability of the cardboard position during the detection process, and thus ensuring the accuracy of subsequent detection.

[0054] As the moving stage 5 continues to move, when the negative pressure adsorption hole 3 is blocked by the cardboard, it cannot take in air. If the negative pressure intensity at the negative pressure adsorption hole 3 is not reduced, the cardboard will deform some of the printed patterns due to the high negative pressure intensity, which will affect the subsequent inspection.

[0055] An electric push rod 20 is fixed on the mounting plate 21 inside the cavity 19 of the detection execution moving stage 5. The output end of the electric push rod 20 is connected to the moving plate 23 through the drive rod 22. When the electric push rod 20 is activated, it drives the drive rod 22 to move the moving plate 23 up and down, thereby adjusting the height of the detection camera 25 mounted on the bottom connecting frame 24 of the moving plate 23.

[0056] By adjusting the height of the inspection camera 25, its visual inspection range can be changed, enabling comprehensive inspection of cardboard of different sizes. The inspection camera 25 has high-precision inspection capabilities, accurately detecting any minute defects on the cardboard, whether it is errors in Chinese or English text, blurry images, color differences in printing, or barcode errors, none of them can hide.

[0057] During the up-and-down movement of the movable plate 23, the pull rope 35 is fixedly connected to the movable plate 23 at one end and to the dust collection box 26 at the other end. The pull rope 35 is wound around the guide rod 29 fixed to the inner wall of the inner cavity 19. The movement of the movable plate 23 pulls the pull rope 35. The pull rope 35 passes through the through hole 33 in the movable baffle 34, and under the pulling action of the pull rope 35, the movable baffle 34 slides along the through groove 38 in the dust collection box 26.

[0058] A connecting plate 32 is fixed to the movable baffle 34. The connecting plate 32 is connected to the dust collection box 26 via two springs 36. When the movable baffle 34 slides, the springs 36 deform accordingly. An airbag 39 is fixed to the bottom of the movable baffle 34. The airbag 39 is used to block the suction pipe 27. As the movable baffle 34 moves, the number of airbags blocking the suction pipe 27 changes, thereby changing the negative pressure suction intensity of the suction pipe 27.

[0059] When the moving plate 23 moves upward, the height of the detection camera 25 increases, and the detection area increases. Driven by the pull rope 35, the two movable baffles 34 can move in opposite directions. This reduces the number of airbags 39 blocking the suction pipe 27, allowing the suction pipe 27 to cover the cardboard and thus perform comprehensive dust removal. At the same time, the number of suction pipes 27 used increases, reducing the negative pressure in the dust collection box 26. The suction pipes 27 and the connecting plate 37 move downward due to gravity. At this time, the rectangular rubber sheet 40 deforms, and the suction pipe 27 is placed close to the cardboard. Due to the relatively small negative pressure suction, it is placed close to the cardboard, which can remove dust more effectively and will not affect the cardboard being suctioned, preventing it from moving.

[0060] When the moving plate 23 moves downward, the height of the detection camera 25 decreases, and the detection area decreases, allowing for the detection of small areas of cardboard. Driven by the elastic force of the spring 36, the two movable baffles 34 can move relative to each other. This increases the number of airbags 39 blocking the suction pipes 27, but the suction pipes 27 can still cover the cardboard, thus enabling comprehensive dust removal. At the same time, the number of suction pipes 27 used decreases, increasing the negative pressure intensity in the suction box 26. Due to the reduced number of suction pipes 27 and the fixed air intake area, air intake through the suction pipes 27 can cause the rectangular rubber sheet 40 to deform, causing the suction pipes 27 and the connecting plate 37 to move upward away from the cardboard. Because the negative pressure suction is relatively increased and the cardboard is moved away, the suction function is ensured without affecting the suctioned cardboard, preventing it from moving and thus ensuring the accuracy of subsequent detection.

[0061] After the suction pipe 27 moves upward, the distance between it and the cardboard increases, thereby increasing the air intake space of the suction pipe 27. Thus, regardless of whether the suction pipe 27 is set upward or downward, the negative pressure suction hole 3 will be within a suitable negative pressure suction range, thereby limiting the cardboard and protecting it.

[0062] The adsorbed dust is transported through the suction pipe 27 and the suction box 26 to the connecting pipe 28, and finally through the hose 12 to the dust filter box 7. The air is filtered through the dust filter screen 18 and then enters the piston cylinder 8, thus achieving the dust removal and collection treatment of the cardboard.

[0063] As the moving stage 5 moves the inspection camera 25, the inspection camera 25 can inspect the printing quality of the cardboard after dust removal.

[0064] After the inspection camera 25 completes a comprehensive inspection of the cardboard, it transmits the inspection data to the computer 4. The computer 4 performs a detailed comparative analysis of the inspection data with pre-imported standard images or PDF originals, generating a comprehensive report. This report allows operators to clearly understand the printing quality of the cardboard, quickly and accurately determine whether the cardboard is qualified, and identify any specific problems, providing a strong basis for subsequent quality control and production improvement. The entire inspection process is highly automated, with all components working collaboratively to ensure the accuracy and efficiency of cardboard printing quality inspection.

[0065] Next, the moving platform 5 is reset, causing the moving piston to squeeze the air in the piston cylinder 8. Due to the setting of the one-way valve 14, the air can only be discharged through the negative pressure suction hole 3, which can blow the cardboard up for easy handling by the staff.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A visual inspection device for printed materials, comprising an equipment housing (1), characterized in that, A computer (4) is installed on the equipment box (1). A testing platform (2) is provided at the top of the equipment box (1). Multiple negative pressure adsorption holes (3) capable of adsorbing printed materials are provided through the testing platform (2). A movable stage (5) is movably connected to the equipment box (1). An inner cavity (19) is provided inside the movable stage (5). A movable plate (23) capable of moving up and down is provided inside the inner cavity (19). A connecting frame (24) is installed at the bottom of the movable plate (23). A testing camera (25) is installed at the bottom of the connecting frame (24). A dust collection box (26) is installed inside the inner cavity (19). A rectangular rubber sheet (40) is fixed inside the dust collection box (26). The rectangular rubber sheet (40) is fixed with a connecting plate (37). Multiple suction pipes (27) are provided through the connecting plate (37) from top to bottom. A movable baffle (34) is provided through the dust collection box (26) to cooperate with the movable plate (23). An airbag (39) that can block the suction pipes (27) is fixed at the bottom of the movable baffle (34). By adjusting the height of the detection camera (25), the visual detection range of the detection camera (25) can be changed and transmitted to the computer (4) for comparison. At the same time, the movable baffle (34) and the airbag (39) are driven to move, changing the number of suction pipes (27) blocked and changing the intensity of the negative pressure suction of the suction pipes (27).

2. The visual inspection device for printed materials according to claim 1, characterized in that, The testing platform (2) is provided with two L-shaped grooves (15) that are connected to the equipment box (1). An L-shaped plate (11) is slidably connected in the L-shaped groove (15). A movable frame (10) is fixed on the L-shaped plate (11). A piston cylinder (8) is fixed in the equipment box (1). A movable piston (9) is slidably connected in the piston cylinder (8). A movable rod (16) is fixedly connected on the movable piston (9). The movable rod (16) is fixedly connected to the movable frame (10). A filter mechanism is provided between the piston cylinder (8) and the negative pressure adsorption hole (3).

3. The visual inspection device for printed matter according to claim 2, characterized in that, The filtration mechanism includes a connecting cover (6) fixed inside the equipment box (1) and covering the negative pressure adsorption hole (3). A dust filter box (7) is installed inside the equipment box (1). A dust filter screen (18) is fixed inside the dust filter box (7). The dust filter box (7) is connected to the connecting cover (6) through a connecting pipe (17). The piston cylinder (8) is connected to the dust filter box (7) through a suction pipe (13). The connecting pipe (17) and the suction pipe (13) are located on the same side of the dust filter screen (18).

4. The visual inspection device for printed materials according to claim 1, characterized in that, An installation plate (21) is fixedly connected inside the inner cavity (19). An electric push rod (20) is fixedly connected on the installation plate (21). A drive rod (22) is fixedly connected to the output end of the electric push rod (20). The lower end of the drive rod (22) is fixedly connected to the upper end of the moving plate (23).

5. A visual inspection device for printed materials according to claim 1, characterized in that, Two brackets (31) are fixed at both ends of the dust collection box (26), and the brackets (31) are fixedly connected to the inner wall of the inner cavity (19).

6. The visual inspection device for printed matter according to claim 1, characterized in that, The dust collection box (26) is provided with a through groove (38), the movable baffle (34) passes through the through groove (38) and is slidably connected to it, the movable baffle (34) is fixed with a connecting plate (32), and two springs (36) are fixed on the connecting plate (32), and the springs (36) are fixedly connected to the dust collection box (26).

7. A visual inspection device for printed materials according to claim 6, characterized in that, The movable baffle (34) has a through hole (33) through which a pull rope (35) passes. One end of the pull rope (35) is fixedly connected to the dust collection box (26), and the other end of the pull rope (35) is fixedly connected to the movable plate (23). A guide rod (29) is fixedly fixed to the inner wall of the inner cavity (19), and the pull rope (35) is wound around the guide rod (29).

8. A visual inspection device for printed matter according to claim 3, characterized in that, The dust filter box (7) is connected to two hoses (12). The hoses (12) are located on one side of the dust filter (18) and opposite to the connecting pipe (17). The hoses (12) pass through the L-shaped plate (11). The upper end of the dust collection box (26) is connected to a connecting pipe (28). A one-way valve (14) is installed on the connecting pipe (28). The connecting pipe (28) is connected to the hoses (12).

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