Printed matter defect detection equipment with limiting structure

Abstract

The invention discloses printed matter defect detection equipment with a limiting structure, and relates to the technical field of detection equipment. Comprising a workbench, a limiting assembly, a winding roller, a printing part, a leveling assembly, an unwinding roller and a limiting assembly are sequentially arranged on the upper portion of the workbench from left to right, the leveling assembly can detect wrinkles on the surface of an adhesive tape and spread the wrinkles of the adhesive tape, and the limiting assemblies at the two ends of the workbench limit the moving direction of the adhesive tape. Deviation of the moving direction of the adhesive tape is prevented. The limiting assemblies arranged at the two ends of the workbench in a one-to-one correspondence mode can guarantee that the original position of the adhesive tape and the winding position of the adhesive tape are located on the same straight line, and the adhesive tape is prevented from wrinkling in the spreading process. When the visual detection camera detects that wrinkles exist on the surface of the adhesive tape, the leveling assembly applies expansion force to the adhesive tape in the width direction and the length direction through the pressing roller and the leveling component, then the wrinkles are spread, and therefore the printing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to a printed product defect detection equipment with a limiting structure. Background Art

[0002] In today's society, the tape used to seal boxes could only achieve a single pasting function in the past, but now most companies will print simple promotional materials on the tape, which plays a simultaneous promotional role when using the tape to paste and seal boxes. This can save high separate promotional costs, and it can be carried out simultaneously with sealing and pasting, without adding extra workload.

[0003] When printing on tape, it is necessary to inspect the tape to prevent wrinkles caused by tape adhesion, which would affect the printing effect. However, when the existing tape printing inspection equipment is unrolled for inspection, it lacks the necessary limit structure for positioning, resulting in the misalignment of the original position of the tape and the tape winding position. When the tape is unrolled, the tape sticks together and wrinkles are formed. In addition, when wrinkle defects are detected on the tape, the machine is usually stopped and the tape roll is replaced directly. This operation seriously affects the printing efficiency of the tape and causes waste of tape.

[0004] Therefore, we made improvements to this and proposed a printed product defect detection device with a limiting structure. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a printed product defect detection device with a limiting structure, which solves the problem in the prior art that when a wrinkle defect is detected in the tape, the machine is usually stopped and the tape roll is replaced directly, and the adhesive surface of the tape is easily adhered and entangled together when the tape is rolled out for inspection, forming a wrinkled surface.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a printed product defect detection device with a limiting structure, comprising a workbench, the upper part of which is provided with a limiting assembly, a winding roller, a printing component, a leveling assembly, an unwinding roller and a limiting assembly from left to right; The winding drum cover is provided with a plurality of uniformly arranged tape paper cylinders, and the unwinding drum cover is provided with a plurality of uniformly arranged tape rolls, and the tapes of the tape rolls pass through the flattening component and the printing component in sequence, and are wound on the tape paper cylinder of the winding drum; Among them, the leveling component can detect the wrinkles on the surface of the tape and spread the wrinkles of the tape. The limit components at both ends of the workbench limit the moving direction of the tape to prevent the moving direction of the tape from shifting.

[0007] As a preferred solution, the limit assembly is provided with a plurality of limit assemblies, and the plurality of limit assemblies are evenly and symmetrically arranged at both ends of the workbench, and the limit assembly includes a fixed seat, a spring rod A and a limit component, the fixed seat is fixedly arranged at one end of the upper part of the workbench, one end of the spring rod A is hinged to the upper rear end of the fixed seat, and the other end of the spring rod A is hinged to the limit component, and the limit component is hinged to the front end of the fixed seat; The limiting component includes a hinged column, a connecting rod, a roller frame A, a rubber roller and a limiting wheel. The hinged column is fixedly connected to the end of the connecting rod, the hinged column is hinged to the fixed seat, one end of the spring rod A is hinged to the middle of the upper surface of the connecting rod, the roller frame A is fixedly set at the lower front end of the connecting rod, the rubber roller is rotatably set in the inner cavity of the roller frame A, and two limiting wheels are provided, and the limiting wheels are set at both ends of the rubber roller.

[0008] As a preferred solution, the limiting wheel comprises a fixed wheel, a movable wheel and a nitrogen spring, a plurality of nitrogen springs are provided, one end of the nitrogen spring is evenly fixed to the inner surface of the fixed wheel along the axis of the fixed wheel, the movable wheel is fixedly connected to the other end of the nitrogen spring, and the fixed wheel and the movable wheel are overlapped; The fixed wheel and the rotating shaft of the rubber roller are rotatably arranged, the movable wheel and the rotating shaft of the rubber roller are arranged to avoid air, and the movable wheel is arranged close to one side of the rubber roller.

[0009] As a preferred solution, the leveling assembly includes a fixed frame, a roller frame B, a pressing roller and a leveling part. The fixed frame is longitudinally arranged on the upper part of the workbench, the roller frame B is transversely arranged on the upper part of the inner cavity of the fixed frame, and the pressing roller is rotatably arranged in the inner cavity of the roller frame B. There are multiple leveling parts, and the leveling parts are arranged one by one corresponding to the limit assemblies at both ends of the workbench. The leveling parts are evenly arranged at the bottom of the pressing roller.

[0010] As a preferred solution, the leveling component includes a roller frame, a roller, a hinged plate and a spring rod B. There are two roller frames, two rollers and two spring rods B. The two roller frames are symmetrically arranged, the rollers are rotatably arranged on the upper part of the roller frames, the spring rod B is hingedly arranged at the middle position of the bottom of the inner surface of the roller frame, the hinged plate is arranged at the bottom of the middle position of the two roller frames, and the spring rod B is hingedly arranged with the hinged plate.

[0011] As a preferred solution, a slide groove is provided on the bottom wall of the inner cavity of the fixed frame along the length direction of the fixed frame, and a sliding block is provided on the bottom of the roller frame, and the sliding block is slidably arranged in the slide groove.

[0012] As a preferred solution, a push rod is hinged on the outer edge of the hinge plate, and one end of the push rod is arranged in the middle position of the two spring rods B; The other ends of the push rods of the plurality of leveling components are connected via a push plate, a hydraulic cylinder A is fixedly arranged in the middle of the push plate, and the hydraulic cylinder A is fixedly arranged on the workbench.

[0013] As a preferred solution, a hydraulic cylinder B is fixedly provided on the upper part of the fixed frame, and the piston rod of the hydraulic cylinder B is fixedly connected to the roller frame B. The pressing roller can move downward through the hydraulic cylinder B and rotate in contact with the roller.

[0014] As a preferred solution, guide rods are fixedly provided longitudinally at both ends of the upper part of the roller frame B, and the guide rods are slidably arranged to penetrate the fixed frame.

[0015] As a preferred solution, a plurality of evenly distributed visual inspection cameras are symmetrically provided on both sides of the upper inner cavity of the fixed frame, and the visual inspection cameras are arranged on the upper part of the leveling component, and the visual inspection cameras and the leveling components are arranged one-to-one.

[0016] The present invention has the following beneficial effects: The limiter components set one by one at both ends of the workbench can ensure that the original position of the tape and the tape winding position are on the same straight line, preventing the tape from wrinkling during the unrolling process; When the visual inspection camera detects wrinkles on the surface of the tape, the flattening component uses the pressing roller and the flattening component to apply expansion force to the width and length directions of the tape to smooth out the wrinkles, thereby improving printing efficiency.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a printed product defect detection device with a limiting structure according to the present invention; Figure 2 It is a structural schematic diagram of a limit assembly of a printed product defect detection device with a limit structure according to the present invention; Figure 3 This is a schematic diagram of the structure of a limiting component of a printed product defect detection device with a limiting structure according to the present invention; Figure 4 This is a schematic diagram of the structure of a limiting wheel of a printed product defect detection device with a limiting structure according to the present invention; Figure 5 This is a schematic diagram of the structure of a leveling component of a printed product defect detection device with a limiting structure according to the present invention; Figure 6 This is a schematic structural diagram of a flattening component of a printed product defect detection device with a limiting structure according to the present invention; In the figure, 1. workbench; 2. limit assembly; 3. winding roller; 4. printing component; 5. leveling assembly; 6. unwinding roller; 7. fixed seat; 8. spring rod A; 9. limit assembly; 10. hinge column; 11. connecting rod; 12. roller frame A; 13. rubber roller; 14. limit wheel; 15. fixed wheel; 16. movable wheel; 17. nitrogen spring; 18. fixed frame; 19. roller frame B; 20. pressing roller; 21. leveling component; 22. roller frame; 23. roller; 24. hinge plate; 25. spring rod B; 26. slide groove; 27. slider; 28. push rod; 29. ​​push plate; 30. hydraulic cylinder A; 31. hydraulic cylinder B; 32. guide rod; 33. visual inspection camera; 34. mounting plate; 35. mounting frame; 36. hydraulic cylinder C; 37. silicone sleeve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] For examples, see Figures 1 to 6 , an embodiment of the present invention provides a technical solution: a printed product defect detection device with a limiting structure, comprising a workbench 1, the upper part of the workbench 1 is provided with a limiting component 2, a winding roller 3, a printing component 4, a leveling component 5, a reeling roller 6 and a limiting component 2 in sequence from left to right; The winding drum 3 is provided with a plurality of uniformly arranged tape paper tubes, and the unwinding drum 6 is provided with a plurality of uniformly arranged tape rolls, and the tapes of the tape rolls pass through the flattening assembly 5 and the printing component 4 in sequence, and are wound on the tape paper tubes of the winding drum 3; Among them, the leveling component 5 can detect the wrinkles on the surface of the tape and spread the wrinkles of the tape. The limiting components 2 at both ends of the workbench 1 limit the moving direction of the tape to prevent the moving direction of the tape from being offset.

[0022] The limiting assembly 2 is provided with a plurality of them, and the plurality of limiting assemblies 2 are evenly and symmetrically arranged at both ends of the workbench 1. The limiting assembly 2 comprises a fixed seat 7, a spring rod A8 and a limiting component 9. The fixed seat 7 is fixedly arranged at one end of the upper part of the workbench 1, one end of the spring rod A8 is hinged to the upper rear end of the fixed seat 7, and the other end of the spring rod A8 is hinged to the limiting component 9. The limiting component 9 is hinged to the front end of the fixed seat 7; The limiting component 9 includes a hinged column 10, a connecting rod 11, a roller frame A12, a rubber roller 13 and a limiting wheel 14. The hinged column 10 is fixedly connected to the end of the connecting rod 11, the hinged column 10 is hinged to the fixed seat 7, one end of the spring rod A8 is hinged to the middle of the upper surface of the connecting rod 11, the roller frame A12 is fixedly set at the lower front end of the connecting rod 11, the rubber roller 13 is rotatably set in the inner cavity of the roller frame A12, and two limiting wheels 14 are provided, and the limiting wheels 14 are set at both ends of the rubber roller 13.

[0023] The limiting wheel 14 includes a fixed wheel 15, a movable wheel 16 and a nitrogen spring 17. A plurality of nitrogen springs 17 are provided. One end of the nitrogen spring 17 is evenly fixed to the inner surface of the fixed wheel 15 along the axis of the fixed wheel 15. The movable wheel 16 is fixedly connected to the other end of the nitrogen spring 17. The fixed wheel 15 and the movable wheel 16 are overlapped. The fixed wheel 15 is rotatably arranged with the rotating shaft of the rubber roller 13 , the movable wheel 16 is arranged with the rotating shaft of the rubber roller 13 to avoid air, and the movable wheel 16 is arranged close to one side of the rubber roller 13 .

[0024] The leveling assembly 5 includes a fixed frame 18, a roller frame B19, a pressing roller 20 and a leveling part 21. The fixed frame 18 is longitudinally arranged on the upper part of the workbench 1, and the roller frame B19 is transversely arranged on the upper part of the inner cavity of the fixed frame 18. The pressing roller 20 is rotatably arranged in the inner cavity of the roller frame B19. The surface of the pressing roller 20 is smoothly arranged. There are multiple leveling parts 21. The leveling parts 21 are arranged one by one corresponding to the limit assemblies 2 at both ends of the workbench 1, and the leveling parts 21 are evenly arranged at the lower part of the pressing roller 20.

[0025] The leveling component 21 includes a roller frame 22, a roller 23, a hinged plate 24 and a spring rod B25. There are two roller frames 22, two rollers 23 and two spring rods B25. The two roller frames 22 are symmetrically arranged. The roller 23 is rotatably arranged on the upper part of the roller frame 22. The spring rod B25 is hingedly arranged at the middle position of the bottom of the inner surface of the roller frame 22. The hinged plate 24 is arranged at the bottom of the middle position of the two roller frames 22. The spring rod B25 is hingedly arranged with the hinged plate 24.

[0026] A slide groove 26 is provided on the bottom wall of the inner cavity of the fixed frame 18 along the length direction of the fixed frame 18 , and a slider 27 is provided on the bottom of the roller frame 22 , and the slider 27 is slidably disposed in the slide groove 26 .

[0027] The outer edge of the hinge plate 24 is hinged with a push rod 28, one end of which is arranged in the middle of the two spring rods B25; The other ends of the push rods 28 of the plurality of leveling components 21 are connected via a push plate 29 , a hydraulic cylinder A30 is fixedly disposed in the middle of the push plate 29 , and the hydraulic cylinder A30 is fixedly disposed on the workbench 1 .

[0028] A hydraulic cylinder B31 is fixedly provided on the upper part of the fixed frame 18 , and a piston rod of the hydraulic cylinder B31 is fixedly connected to the roller frame B19 . The pressing roller 20 can move downward through the hydraulic cylinder B31 and rotate in contact with the roller 23 .

[0029] Guide rods 32 are fixedly disposed longitudinally at both ends of the upper portion of the roller frame B19, and the guide rods 32 and the fixed frame 18 are slidably disposed therethrough.

[0030] A plurality of evenly distributed visual inspection cameras 33 are symmetrically disposed on both sides of the upper inner cavity of the fixed frame 18 . The visual inspection cameras 33 are disposed on the upper portion of the leveling component 21 . The visual inspection cameras 33 and the leveling components 21 are disposed one-to-one.

[0031] The winding roller 3 and the unwinding roller 6 are both provided with two, and the two winding rollers 3 are symmetrically arranged, and the two unwinding rollers 6 are symmetrically arranged; The winding drum 3 is symmetrically arranged on both sides of one end of the workbench 1, and the unwinding drum 6 is symmetrically arranged on both sides of the other end of the workbench 1. The rotating shafts at one end of the winding drum 3 and the unwinding drum 6 are rotatably arranged with the workbench 1 through the mounting plate 34, and the mounting plate 34 is arranged on one side of the upper part of both ends of the workbench 1; A stepper motor is fixedly connected to the rotating shaft of the winding drum 3 rotatably arranged with the mounting plate 34 , and the stepper motor is fixedly arranged on the mounting plate 34 .

[0032] A mounting frame 35 is fixedly provided on the upper part of both ends of the other side of the workbench 1, and a hydraulic cylinder C36 is fixedly provided on the outside of the mounting frame 35. The rotating shafts of the winding drum 3 and the unwinding drum 6 arranged on the other side of the workbench 1 are rotatably arranged with the piston rod of the hydraulic cylinder C36; The winding drum 3 and the unwinding drum 6 are slidably disposed in the inner cavity of the mounting frame 35 .

[0033] The outer walls of the winding drum 3 and the unwinding drum 6 are covered with a plurality of uniformly distributed silicone sleeves 37 , and the silicone sleeves 37 are arranged in a one-to-one correspondence with the limiting components 2 .

[0034] One end of the two winding rollers 3 that are opposite to each other is a plane, and one end of the two unwinding rollers 6 that are opposite to each other is a plane.

[0035] Working principle of the present invention: The hydraulic cylinder C36 of the winding drum 3 is started to separate the symmetrically arranged winding drum 3, and the hydraulic cylinder C36 of the unwinding drum 6 is started to separate the symmetrically arranged unwinding drum 6, so that the tape paper roll is evenly sleeved on the winding drum 3, and the tape roll is evenly sleeved on the unwinding drum 6; The hydraulic cylinder C36 of the winding drum 3 is started to dock the flat surfaces of one end of the relatively arranged winding drum 3, and the hydraulic cylinder C36 of the unwinding drum 6 is started to dock the flat surfaces of one end of the relatively arranged unwinding drum 6; The silicone sleeve 37 can increase the resistance between the tape paper tube and the winding roller 3, and the resistance between the unwinding roller 6 and the tape roll, so as to prevent the tape paper tube and the tape roll from sliding.

[0036] The limiting component 9 of the limiting assembly 2 is elastically placed on the outer surface of the tape paper tube and the tape roll through the spring rod A8, the rubber roller 13 of the limiting component 9 is placed on the outer ring wall of the tape paper tube and the tape roll, the limiting wheel 14 is placed on both sides of the tape paper tube and the tape roll, and the movable wheel 16 of the limiting wheel 14 is elastically arranged on both sides of the tape paper tube and the tape roll through the nitrogen spring 17, so that the rotation direction of the tape paper tube and the tape roll is limited by the movable wheel 16 to prevent the winding roller 3 and the unwinding roller 6 from being misaligned when the tape is rolled out, causing the tape to be wrinkled, affecting the detection and printing of the tape.

[0037] The adhesive tape of the tape roll passes through the flattening assembly 5 and the printing component 4 in sequence, and is wound on the tape paper tube of the winding drum 3 . The adhesive tape is placed between the pressing roller 20 of the flattening assembly 5 and the flattening component 21 .

[0038] The stepper motor of the winding drum 3 is started, and the adhesive tape printed by the printing unit 4 is slowly wound onto the tape paper roll. When the visual detection camera 33 close to the unwinding drum 6 detects wrinkles on the surface of the tape; The hydraulic cylinder B31 is started, and the pressing roller 20 contacts the upper part of the roller 23 of the leveling component 21, so that the tape is squeezed between the pressing roller 20 and the roller 23, and the adhesive surface of the tape is placed on the roller 23. The hydraulic cylinder A30 is started, and the push rod 28 is pushed by the push plate 29, and the push rod 28 drives the hinge plate 24 to move. Since the tape is squeezed between the pressing roller 20 and the roller 23, and the adhesive surface of the tape is placed on the roller 23, there is resistance between the roller 23 and the tape. When the two spring rods B25 are in the attached Figure 6In the state shown, the roller 23 generates an expansion force toward both sides of the tape through the spring rod B25. The expansion force can expand the tape in the width direction, expand the wrinkles in the length direction of the tape, and then spread the wrinkles.

[0039] The pressing roller 20 can apply pressure to the adhesive tape, and the pressure of the pressing roller 20 can spread out the wrinkles of the adhesive tape in the width direction.

[0040] The visual inspection camera 33 near the winding drum 3 detects whether the surface of the tape after being trimmed by the leveling component 5 is flat. If the surface is flat, the machine continues to work. If there are still wrinkles on the surface, the staff stops the machine and replaces the tape roll. When the visual inspection camera 33 near the unwinding drum 6 detects that the surface of the tape is flat; The hydraulic cylinder B31 is started to separate the pressing roller 20 from the upper part of the roller 23 of the leveling component 21. The hydraulic cylinder A30 is started to pull the push rod 28 through the push plate 29. The push rod 28 drives the hinge plate 24 to move, stretching the two spring rods B25 to be placed at the bottom of the roller frame 22.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A printed product defect detection device with a limiting structure, characterized in that: The workbench (1) comprises a workbench (1), wherein the upper part of the workbench (1) is provided with a limit assembly (2), a winding roller (3), a printing component (4), a leveling assembly (5), an unwinding roller (6) and a limit assembly (2) in order from left to right; The winding roller (3) is provided with a plurality of uniformly arranged adhesive tape paper cylinders, and the unwinding roller (6) is provided with a plurality of uniformly arranged adhesive tape rolls, the adhesive tapes of the adhesive tape rolls sequentially passing through the flattening component (5) and the printing component (4), and being wound around the adhesive tape paper cylinders of the winding roller (3); The flattening component (5) is capable of detecting wrinkles on the surface of the tape and spreading out the wrinkles of the tape, and the limiting components (2) at both ends of the workbench (1) limit the moving direction of the tape to prevent the moving direction of the tape from being offset.

2. The printed product defect detection device with a limiting structure according to claim 1, characterized in that: The limiting assembly (2) is provided in plurality, and the plurality of limiting assemblies (2) are evenly and symmetrically arranged at both ends of the workbench (1). The limiting assembly (2) comprises a fixed seat (7), a spring rod A (8) and a limiting component (9). The fixed seat (7) is fixedly arranged at one end of the upper part of the workbench (1), one end of the spring rod A (8) is hinged to the upper rear end of the fixed seat (7), the other end of the spring rod A (8) is hinged to the limiting component (9), and the limiting component (9) is hinged to the front end of the fixed seat (7); The limiting component (9) comprises a hinged column (10), a connecting rod (11), a roller frame A (12), a rubber roller (13) and a limiting wheel (14); the hinged column (10) is fixedly connected to the end of the connecting rod (11); the hinged column (10) is hinged to the fixing seat (7); one end of the spring rod A (8) is hinged to the middle of the upper surface of the connecting rod (11); the roller frame A (12) is fixedly arranged at the lower front end of the connecting rod (11); the rubber roller (13) is rotatably arranged in the inner cavity of the roller frame A (12); and two limiting wheels (14) are provided, and the limiting wheels (14) are arranged at both ends of the rubber roller (13).

3. The printed product defect detection device with a limiting structure according to claim 2, characterized in that: The limiting wheel (14) comprises a fixed wheel (15), a movable wheel (16) and a nitrogen spring (17), wherein a plurality of nitrogen springs (17) are provided, one end of the nitrogen spring (17) is evenly fixed to the inner surface of the fixed wheel (15) along the axis of the fixed wheel (15), the movable wheel (16) is fixedly connected to the other end of the nitrogen spring (17), and the fixed wheel (15) and the movable wheel (16) are arranged to overlap; The fixed wheel (15) and the rotating shaft of the rubber roller (13) are rotatably arranged, the movable wheel (16) and the rotating shaft of the rubber roller (13) are arranged to avoid air, and the movable wheel (16) is arranged close to one side of the rubber roller (13).

4. The printed product defect detection device with a limiting structure according to claim 1, characterized in that: The leveling assembly (5) comprises a fixed frame (18), a roller frame B (19), a pressing roller (20) and a leveling component (21); the fixed frame (18) is longitudinally arranged on the upper part of the workbench (1); the roller frame B (19) is transversely arranged on the upper part of the inner cavity of the fixed frame (18); the pressing roller (20) is rotatably arranged in the inner cavity of the roller frame B (19); a plurality of leveling components (21) are provided, and the leveling components (21) are arranged one-to-one with the limit components (2) at both ends of the workbench (1); and the leveling components (21) are evenly arranged on the lower part of the pressing roller (20).

5. The printed product defect detection device with a limiting structure according to claim 4, characterized in that: The leveling component (21) comprises a roller frame (22), a roller (23), a hinged plate (24) and a spring rod B (25). The roller frame (22), the roller (23) and the spring rod B (25) are each provided with two, the two roller frames (22) are symmetrically arranged, the roller (23) is rotatably arranged on the upper part of the roller frame (22), the spring rod B (25) is hingedly arranged at the middle position of the bottom of the inner surface of the roller frame (22), the hinged plate (24) is arranged at the bottom of the middle position of the two roller frames (22), and the spring rod B (25) is hingedly arranged with the hinged plate (24).

6. The printed product defect detection device with a limiting structure according to claim 5, characterized in that: The bottom wall of the inner cavity of the fixed frame (18) is provided with a slide groove (26) along the length direction of the fixed frame (18), and the bottom of the roller frame (22) is provided with a slider (27), and the slider (27) is slidably arranged in the slide groove (26).

7. The printed product defect detection device with a limiting structure according to claim 5, characterized in that: A push rod (28) is hingedly connected to the outer edge of the hinge plate (24), and one end of the push rod (28) is arranged at a middle position between the two spring rods B (25); The other ends of the push rods (28) of the plurality of leveling components (21) are connected via a push plate (29), a hydraulic cylinder A (30) is fixedly provided in the middle of the push plate (29), and the hydraulic cylinder A (30) is fixedly provided on the workbench (1).

8. The printed product defect detection device with a limiting structure according to claim 5, characterized in that: A hydraulic cylinder B (31) is fixedly provided on the upper part of the fixed frame (18); a piston rod of the hydraulic cylinder B (31) is fixedly connected to the roller frame B (19); the pressing roller (20) can be moved downward by the hydraulic cylinder B (31) and is arranged to rotate in contact with the roller (23).

9. The printed product defect detection device with a limiting structure according to claim 4, characterized in that: Guide rods (32) are fixedly disposed longitudinally at both ends of the upper portion of the roller frame B (19), and the guide rods (32) and the fixed frame (18) are slidably disposed therethrough.

10. The printed product defect detection device with a limiting structure according to claim 4, characterized in that: A plurality of evenly distributed visual inspection cameras (33) are symmetrically arranged on both sides of the upper inner cavity of the fixed frame (18); the visual inspection cameras (33) are arranged on the upper part of the leveling component (21); and the visual inspection cameras (33) and the leveling components (21) are arranged in a one-to-one correspondence.

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