Device for detecting the printing quality on the surface of a paper product

Abstract

The application relates to the technical field of printing quality detection, and discloses a device for detecting the printing quality of the surface of a paper product, which comprises a mesh belt conveyor capable of conveying the printed paper product to be detected, the mesh belt conveyor comprising a conveying mesh; and a visual camera capable of detecting the printing quality of the surface of the paper product conveyed by the mesh belt conveyor. The device for detecting the printing quality of the surface of a paper product generates negative pressure under the paper product through a suction mechanism, firmly adsorbs the paper product on the surface of the conveying mesh, replaces the physical contact type fixing of a traditional compression wheel, can avoid the compression wheel covering the printing area to form a detection blind area, realizes visual detection of the printing surface without dead angles, does not need the compression wheel to directly contact the paper product, completely avoids the problem of pressing surface paper scraps into the paper fiber, and can stably adsorb paper products with different thicknesses and stiffnesses, including thin paper and corrugated paper boxes, by adjusting the negative pressure intensity.

Description

Technical Field

[0001] This invention relates to the field of printing quality inspection technology, specifically to an apparatus for inspecting the printing quality of paper products. Background Technology

[0002] Devices for inspecting the printing quality of paper products typically refer to specialized equipment used to automatically or semi-automatically identify various defects that may occur during the printing process of printed materials (such as cartons, labels, packaging boxes, books, etc.), including omissions, misprints, misregistration, color deviations, stains, scratches, ink spots, and blurry images. These devices are widely used in the printing, packaging, and publishing industries to ensure product appearance quality and brand visual consistency.

[0003] Currently, printing inspection machines on the market have relatively complete functions. They can not only effectively detect common defects in the printing process such as dirt spots, stains, incomplete patterns, mixed materials, mixed codes, wrong codes, missing codes, and screen printing offsets, but also automatically sort good and bad products without stopping the machine, which significantly improves production efficiency and quality control level.

[0004] However, in practical applications, existing quality inspection machines still have several technical bottlenecks, especially when inspecting different types of paper products. Due to the large differences in their physical properties such as thickness and stiffness (hardness), in order to prevent the paper from deviating, curling, or shaking during the conveying process, which would affect the imaging quality, it is usually necessary to set up a pressure roller mechanism in the inspection box to flatten the paper through the pressure roller to ensure stable transmission and clear imaging.

[0005] However, this structural design also brings new problems: on the one hand, the pressure roller may block part of the printing area during the process of pressing the paper, forming a blind spot for visual inspection, which makes it impossible to effectively identify local defects; on the other hand, paper scraps generated during the cutting process of paper products are easy to adhere to the surface, which are easily misjudged as "dirt spots" during image acquisition, causing false alarms; more seriously, during the process of direct contact between the pressure roller and the paper, paper scraps that were originally only attached to the surface may be pressed into the paper fibers, which are not only difficult to remove, but also artificially introduce new defects, thereby increasing the defect rate and affecting the overall inspection accuracy and production yield. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a testing device for the printing quality of paper products, which can ensure the stability of the paper products under test without direct physical contact.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for detecting the printing quality of paper product surfaces, comprising:

[0008] A mesh belt conveyor is used to transport printed paper products to be inspected. The mesh belt conveyor includes a conveyor mesh.

[0009] A visual camera that can detect the printing quality of paper products conveyed by a mesh belt conveyor;

[0010] The housing has a visual camera fixedly connected to the top surface of the inner wall of the housing, with the detection end of the visual camera facing the conveyor network.

[0011] Support mechanism, which supports the mesh belt conveyor and the housing;

[0012] The suction mechanism can adsorb the paper products to be tested onto the surface of the conveyor belt of the mesh belt conveyor, and the suction mechanism can also remove debris from the box.

[0013] The flattening mechanism can blow away debris from the surface of the paper product being tested;

[0014] The air supply mechanism provides the power for the suction mechanism to adsorb paper products, and the air supply mechanism can also apply the gas discharged by the suction mechanism to the flattening mechanism.

[0015] The dust removal mechanism can clean up the debris extracted by the suction mechanism during the circulation of the conveyor network;

[0016] The back-blowing mechanism can clean debris adhering to the surface of the vision camera while the dust cleaning mechanism is cleaning the debris removed by the suction mechanism.

[0017] Furthermore, the support mechanism includes a first plate and a second plate, with a mesh belt conveyor located between the first plate and the second plate. The upper surfaces of the first plate and the second plate are fixedly connected to both sides of the bottom surface of the box, respectively.

[0018] Furthermore, the intake mechanism includes a second housing, at least one first housing, two partitions, a number of first rods equal to the total number of the two types of housings, a number of fourth tubes equal to the total number of the two types of housings, a number of third plates equal to the total number of the two types of housings, a number of second flares equal to the total number of the two types of housings, and one more filter screen than the total number of the two types of housings. The same end of each of the second flares is fixedly connected to one end of each of the first rods. The other ends of each of the first rods are fixedly connected to the second plate. The ends of the second flares furthest from the first rods are fixedly connected to the second housing and the first housings, respectively. The other ends of the second housing and the first housings are fixedly connected to one end of each of the fourth tubes. One end of one of the fourth tubes is connected to the air supply mechanism. The interior of the second housing forms three first cavities, wherein the outer walls of two filters are respectively connected to one of the first cavities. The inner walls of the two first cavities are fixedly connected, and the interior of the first box forms two second cavities. The outer wall of one filter screen is fixedly connected to the inner wall of one of the second cavities. The fourth tube is aligned and connected to the first or second cavity with the filter screen. Several third plates are fastened to the remaining first or second cavity by bolts. One end of the dust removal mechanism is located inside the first and second boxes. The dust removal mechanism abuts against the side of the filter screen away from the fourth tube. The end of the back-blowing mechanism away from the vision camera is connected to the second box. The outer walls of the first and second boxes are fixedly connected to the inner walls of the first plates. The suction mechanism is located inside the conveyor belt. The openings of several second horn-shaped nozzles face the box. The two ends of the two partitions are fixedly connected to the first and second plates respectively, and the second and first boxes are located between the two partitions.

[0019] Furthermore, the flattening mechanism includes a first tube and a first flared mouth. One end of the first tube is connected to the end of the air supply mechanism away from the fourth tube. One side of the first tube is fixedly connected to one end of the first flared mouth. The opening of the first flared mouth faces the conveyor network, and there is an inclined angle between the first flared mouth and the conveyor network.

[0020] Furthermore, the gas supply mechanism includes a multi-port pipe, a first fan, a fifth pipe body, and several second pipe bodies. The several second pipe bodies are respectively fastened to the end of the fourth pipe body away from the first rod body through several first flanges. The other ends of the several second pipe bodies are respectively fixedly connected to several ends of the multi-port pipe. The last end of the multi-port pipe is fixedly connected to the air inlet end of the first fan. The air outlet end of the first fan is fixedly connected to one end of the fifth pipe body. The other end of the fifth pipe body is fixedly connected to one end of the first pipe body. The first fan is fixedly connected to the outer wall of the housing through a bracket.

[0021] Furthermore, the dust removal mechanism includes a fourth plate, a torsion spring, a second rod, a third rod, at least two sixth plates, a fifth plate equal in number to the two types of boxes, a spring equal in number to the two types of boxes, a fourth rod equal in number to the two types of boxes, and a seventh plate equal in number to the two types of boxes. The upper ends of the two sixth plates are fixedly connected to the side of the conveyor mesh near the suction mechanism. The lower ends of the two sixth plates are respectively sleeved and fixedly connected to the outer walls of both ends of the second rod. One end of the fourth plate is sleeved and rotatably connected to the outer wall of the second rod, and the other end of the fourth plate abuts against the upper end of one of the fifth plates. The torsion spring is sleeved on the outside of the middle part of the second rod, and the two ends of the torsion spring are respectively... The third rod is fixedly connected to the fourth plate and the conveyor network. The outer wall of the third rod is fixedly connected to the upper ends of several fifth plates. The lower ends of several fifth plates are fixedly connected to several springs and one end of several fourth rods. The other ends of several fourth rods pass through the first box and the second box and are fixedly connected to one side of several seventh plates. The outer wall of the seventh plate abuts against the inner walls of the first box and the second box and the surface of the filter screen. The ends of several springs away from the fifth plates are fixedly connected to the outer walls of the first box and the second box. The sum of the spring force and the friction force of the seventh plate against the inner walls of the first box and the second box is a first value. The torsion value of the torsion spring is greater than the first value.

[0022] Furthermore, the backflushing mechanism includes a third tube, a ring, and several air outlets. One end of the third tube is fixedly connected to the outer wall of the second box, and the other end of the third tube extends into the box and is connected to the outer wall of the ring at a height. The upper end of the ring is fixedly connected to the outer wall of the vision camera. One end of each of the several air outlets is fixedly connected to the inner wall of the lower end of the ring. The third tube is connected to a first cavity in the second box that has a filter screen and is far away from the fourth tube. A second fan is provided on the inner wall of the third tube near the end of the second box.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This device for detecting the printing quality of paper products generates negative pressure under the paper product through an air suction mechanism, firmly adhering the paper product to the surface of the conveyor network. It replaces the physical contact fixation of traditional pressure rollers. First, it can avoid the pressure rollers covering the printing area and creating blind spots in the detection, achieving visual inspection of the printing surface without dead angles. Second, it eliminates the need for pressure rollers to directly contact the paper product, completely avoiding the problem of pressing surface paper scraps into the paper fibers. Furthermore, by adjusting the negative pressure intensity, it can stably adsorb paper products of different thicknesses and stiffnesses, including thin sheets of paper and corrugated boxes.

[0025] This device for detecting the printing quality of paper products uses a flattening mechanism that uses the purified airflow discharged by the suction mechanism to blow away paper scraps and dust adhering to the surface of the paper products from an oblique angle. Combined with the airflow angle, it removes debris and reduces the false judgment rate of visual inspection.

[0026] This device for testing the printing quality of paper products has a dust removal mechanism that circulates with the conveyor network, periodically scraping away debris from the filter screen surface and collecting it into a dedicated cavity. This prevents filter screen clogging, which can lead to a decrease in adsorption capacity and increase the continuous operating time of the equipment.

[0027] This device for detecting the printing quality of paper products has a back-blowing mechanism that starts synchronously during the dust removal cycle. It uses an annular air outlet to blow air through the camera lens to maintain the lens's cleanliness and ensure stable image clarity.

[0028] This device for testing the printing quality of paper products uses a suction mechanism to extract gas, which is then purified by a filter and directly transported to a flattening mechanism for recycling. No additional air source is required, and debris is collected in a closed cavity to prevent paper scraps from scattering and causing pollution to the workshop environment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall appearance of the present invention;

[0030] Figure 2 This is a schematic diagram of the overall appearance of the invention from another perspective;

[0031] Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention;

[0032] Figure 4 This is a detailed connection diagram of the components of the present invention, including the housing, the vision camera, and the back-blowing mechanism.

[0033] Figure 5 This is a detailed connection diagram of the supporting mechanism, flattening mechanism, and suction mechanism of the present invention;

[0034] Figure 6 This is a detailed connection diagram of the mesh belt conveyor, support mechanism, and partition plate of the present invention;

[0035] Figure 7 This is a detailed connection diagram of the components of the present invention, including the flattening mechanism, the suction mechanism, and the air supply mechanism.

[0036] Figure 8 This is a detailed connection diagram of the flattening mechanism and air supply mechanism of the present invention;

[0037] Figure 9 This is a cross-sectional and exploded view of the components such as the air intake mechanism and the dust removal mechanism of the present invention;

[0038] Figure 10 This is a detailed connection diagram of the various components of the dust removal mechanism of the present invention.

[0039] In the picture:

[0040] 1. Box body;

[0041] 2. Mesh belt conveyor;

[0042] 3. Supporting mechanism; 31. First plate; 32. Second plate;

[0043] 4. Flattening mechanism; 41. First tube body; 42. First bell mouth;

[0044] 5. Inhalation mechanism; 51. First rod; 52. First box; 53. Fourth tube; 54. Second box; 55. Third plate; 56. Partition; 57. Second flare; 58. Filter screen;

[0045] 6. Gas supply mechanism; 61. Multi-port pipe; 62. First blower; 63. Fifth pipe body; 64. Second pipe body;

[0046] 7. Visual camera;

[0047] 8. Backflush mechanism; 81. Third tube body; 82. Ring body; 83. Air outlet;

[0048] 9. Dust removal mechanism; 91. Fourth plate; 92. Fifth plate; 93. Torsion spring; 94. Second rod; 95. Sixth plate; 96. Third rod; 97. Spring; 98. Fourth rod; 99. Seventh plate. Detailed Implementation

[0049] 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.

[0050] Please see Figures 1-10 A device for detecting the printing quality of paper product surfaces, comprising:

[0051] Mesh belt conveyor 2, which is capable of conveying printed paper products to be inspected, includes a conveyor mesh;

[0052] The visual camera 7 is capable of detecting the printing quality of the paper products conveyed by the mesh belt conveyor 2;

[0053] The housing 1 has a visual camera 7 fixedly connected to the top surface of the inner wall of the housing 1, with the detection end of the visual camera 7 facing the conveyor network.

[0054] Support mechanism 3, which can support mesh belt conveyor 2 and box 1;

[0055] The suction mechanism 5 can adsorb the paper products to be tested onto the surface of the conveyor belt of the mesh belt conveyor 2, and the suction mechanism 5 can also remove the debris in the box 1.

[0056] The flattening mechanism 4 can blow away debris from the surface of the paper product to be tested;

[0057] The air supply mechanism 6 provides the power to the suction mechanism 5 to adsorb paper products, and the air supply mechanism 6 can also act the gas discharged by the suction mechanism 5 on the flattening mechanism 4.

[0058] The dust removal mechanism 9 can clean up the debris extracted by the suction mechanism 5 during the circulation of the conveyor network;

[0059] The back-blowing mechanism 8 is able to clean the debris adhering to the surface of the vision camera 7 while the dust cleaning mechanism 9 is cleaning the debris extracted by the suction mechanism 5;

[0060] Specifically, by setting an air suction mechanism 5 inside the conveyor belt of the mesh belt conveyor 2, which is also below the vision camera 7, when the paper product to be tested is conveyed by the mesh belt conveyor 2, after the paper product enters the box 1, the air supply mechanism 6 is activated and the air suction mechanism 5 passes through the conveyor belt from below the paper product to firmly suck the paper product onto the surface of the conveyor belt. After that, the paper product continues to move, which can avoid the paper product shaking due to vibration or other reasons, thus avoiding affecting the shooting quality of the vision camera 7. At the same time, since there is no physical pressure, there is no need to worry about external factors contaminating the printing effect.

[0061] In addition, during practical applications, paper scraps and other debris may adhere to the surface of the paper product to be tested. In this case, the gas drawn from the suction mechanism 5 by the air supply mechanism 6 is delivered to the flattening mechanism 4. The flattening mechanism 4 can also blow air onto the surface of the paper product from above, thereby blowing off the paper scraps and other debris that are slightly adhered due to static electricity, thus avoiding the probability of misjudgment by the visual camera 7 due to paper scraps blocking the view.

[0062] In addition, as the suction mechanism 5 and the flattening mechanism 4 continue to operate, the suction mechanism 5 will suck up paper scraps and other debris into its interior. In order to avoid obstructing the normal flow of gas over time, a dust removal mechanism 9 is set up. During the circulation of the conveyor network, the dust removal mechanism 9 can periodically clean the debris absorbed inside the suction mechanism 5, reducing the probability of blockage.

[0063] Furthermore, since the visual camera 7 is suspended above the inside of the housing 1, under the blowing force of the flattening mechanism 4, some debris may "fly around" inside the housing 1 and stick to the lens glass of the visual camera 7. Similarly, in order to avoid hindering the detection accuracy of the visual camera 7, during the dust removal mechanism 9, the airflow direction inside the second housing 54 can be automatically switched, thereby guiding the gas originally directed to the flattening mechanism 4 into the back-blowing mechanism 8 to blow away the debris stuck to the surface of the visual camera 7.

[0064] Furthermore, the mesh belt conveyor 2, the housing 1, and the vision camera 7 are all mature technologies in existing printing inspection machines, such as the GER-HV8002 printing inspection machine. In this invention, no changes have been made to the principle, installation position, installation method, etc. of the mesh belt conveyor 2, the housing 1, and the vision camera 7, and all original functions have been retained.

[0065] Furthermore, in order to enable the support mechanism 3 to support the mesh belt conveyor 2 and the box 1, as a preferred embodiment of the present invention, the support mechanism 3 includes a first plate 31 and a second plate 32, the mesh belt conveyor 2 is located between the first plate 31 and the second plate 32, and the upper surfaces of the first plate 31 and the second plate 32 are respectively fixedly connected to the two sides of the bottom surface of the box 1.

[0066] Specifically, by setting the first plate 31 and the second plate 32, both the mesh belt conveyor 2 and the box 1 can be supported. The first plate 31 and the second plate 32 are also mature technologies in the GER-HV8002 printing inspection machine. In this invention, since some of the subsequent components such as the suction mechanism 5 are connected to the first plate 31 and the second plate 32 respectively, they are distinguished by "first plate 31" and "second plate 32". In fact, the first plate 31 and the second plate 32 are just two long plates.

[0067] Furthermore, in order for the suction mechanism 5 to adsorb the paper product to be tested onto the conveyor surface of the mesh conveyor 2, and for the suction mechanism 5 to also remove debris from the box 1, as a preferred embodiment of the present invention, the suction mechanism 5 includes a second box 54, at least one first box 52, two partitions 56, a first rod 51 equal to the total number of the two types of boxes, a fourth tube 53 equal to the total number of the two types of boxes, a third plate 55 equal to the total number of the two types of boxes, and a second flared opening 57 equal to the total number of the two types of boxes. A filter 58, one more than the total number of the two types of boxes, has several second bell-shaped openings 57, each with one end fixedly connected to one end of several first rods 51. The other ends of the first rods 51 are all fixedly connected to the second plate 32. The ends of the second bell-shaped openings 57 furthest from the first rods 51 are fixedly connected to the second box 54 and several first boxes 52. The other ends of the second box 54 and several first boxes 52 are fixedly connected to one end of several fourth tubes 53. One end of one of the fourth tubes 53 is connected to the air supply mechanism 6. The interior of the two-box body 54 forms three first cavities, with the outer walls of two filters 58 fixedly connected to the inner walls of two of the first cavities respectively. The interior of the first-box body 52 forms two second cavities, with the outer wall of one filter 58 fixedly connected to the inner wall of one of the second cavities. The fourth tube 53 is aligned and connected to the first or second cavity with the fixedly connected filter 58. Several third plates 55 are fastened to the remaining first or second cavity by bolts. One end of the dust removal mechanism 9 is located in the first box body 52 and the second... Inside the box 54, the dust removal mechanism 9 and the filter screen 58 are abutted on the side away from the fourth tube 53. The end of the back-blowing mechanism 8 away from the visual camera 7 is connected to the second box 54. The outer walls of the first box 52 and the second box 54 are fixedly connected to the inner wall of the first plate 31. The suction mechanism 5 is located inside the conveyor network. The openings of several second horn mouths 57 are all facing the box 1. The two ends of the two partitions 56 are fixedly connected to the first plate 31 and the second plate 32 respectively, and the second box 54 and the first box 52 are both located between the two partitions 56.

[0068] Specifically, in actual use, the opening of the second horn 57 faces upwards (e.g. Figure 5 As shown, and the second horn 57 is located inside the conveyor network, when the gas supply mechanism 6 is started, the gas inside the first box 52 and the second box 54 is drawn away by the gas supply mechanism 6. Then the first box 52 and the second box 54 can draw gas from the second horn 57, thereby tightly adsorbing the paper products that were originally on the surface of the conveyor network onto the surface of the conveyor network.

[0069] In addition, such as Figure 9As shown, because the first box 52 and the second box 54 are divided into multiple cavities, one of which is connected to the air supply mechanism 6 through the fourth tube 53, the gas drawn from the second horn 57 will first pass through the filter screen 58. If the drawn gas contains paper scraps or other debris, these debris will be blocked by the filter screen 58. The clean gas will pass through the filter screen 58 and be transported to the flattening mechanism 4 under the action of the air supply mechanism 6 and blown onto the surface of the paper product, thereby avoiding repeated contamination.

[0070] In addition, when the conveyor belt moves around once (or half a circle, it is not limited to this), the cleaning mechanism 9 can automatically scrape the debris clogging the surface of the filter screen 58, thereby reducing the clogging rate (the specific cleaning method is explained in detail below).

[0071] Furthermore, in order to enable the flattening mechanism 4 to blow off the debris on the surface of the paper product to be tested, as a preferred embodiment of the present invention, the flattening mechanism 4 includes a first tube 41 and a first flared mouth 42. One end of the first tube 41 is connected to the end of the air supply mechanism 6 away from the fourth tube 53, and one side of the first tube 41 is fixedly connected to one end of the first flared mouth 42. The opening of the first flared mouth 42 faces the conveyor network, and there is an inclined angle between the first flared mouth 42 and the conveyor network.

[0072] Specifically, when the gas supply mechanism 6 is started, the gas filtered by the filter screen 58 can be delivered into the first pipe body 41, and then blown from the opening of the first horn 42 towards the conveyor network. Since there is an inclined angle between the first horn 42 and the conveyor network (such as an inclination of 30°), paper scraps and other debris that may be stuck to the surface of the paper products by the second horn 57 can be blown off the surface of the paper products to avoid the debris from obstructing the shooting image of the visual camera 7.

[0073] Furthermore, in order to enable the air supply mechanism 6 to provide the suction mechanism 5 with the power to adsorb paper products, and the air supply mechanism 6 to also act the gas discharged by the suction mechanism 5 on the flattening mechanism 4, as a preferred embodiment of the present invention, the air supply mechanism 6 includes a multi-port pipe 61, a first fan 62, a fifth pipe body 63 and a plurality of second pipe bodies 64. The plurality of second pipe bodies 64 are respectively fastened to the end of the fourth pipe body 53 away from the first rod body 51 through a plurality of first flanges. The other ends of the plurality of second pipe bodies 64 are respectively fixedly connected to a plurality of ends of the multi-port pipe 61. The last end of the multi-port pipe 61 is fixedly connected to the air inlet end of the first fan 62. The air outlet end of the first fan 62 is fixedly connected to one end of the fifth pipe body 63. The other end of the fifth pipe body 63 is fixedly connected to one end of the first pipe body 41. The first fan 62 is fixedly connected to the outer wall of the housing 1 through a bracket.

[0074] Specifically, when it is necessary to test the printing quality of the paper product surface, simply turn on the first fan 62 (which can be a centrifugal fan). The air inlet of the first fan 62 can draw air from the inside of the fourth tube 53 through the multi-port pipe 61 and the second tube 64. Then the first fan 62 delivers the air to the first tube 41 through the fifth tube 63, and then blows it onto the surface of the paper product from the first horn 42. Finally, it is drawn in from the second horn 57 to achieve gas circulation.

[0075] Furthermore, in order to enable the dust removal mechanism 9 to clean the debris extracted by the suction mechanism 5 during the cyclic movement of the conveyor network, as a preferred embodiment of the present invention, the dust removal mechanism 9 includes a fourth plate 91, a torsion spring 93, a second rod 94, a third rod 96, at least two sixth plates 95, a fifth plate 92 equal in number to the two types of boxes, a spring 97 equal in number to the two types of boxes, a fourth rod 98 equal in number to the two types of boxes, and a seventh plate 99 equal in number to the two types of boxes. The upper ends of the two sixth plates 95 are fixedly connected to the side of the conveyor network near the suction mechanism 5. The lower ends of the two sixth plates 95 are respectively sleeved and fixedly connected to the outer walls of both ends of the second rod 94. One end of the fourth plate 91 is sleeved and rotatably connected to the outer wall of the second rod 94. The other end of the fourth plate 91 abuts against the upper end of one of the fifth plates 92. The torsion spring 93 is sleeved on... The outer part of the middle of the second rod 94, the two ends of the torsion spring 93 are fixedly connected to the fourth plate 91 and the conveyor net respectively. The outer wall of the third rod 96 is fixedly connected to the upper ends of several fifth plates 92 respectively. The lower ends of several fifth plates 92 are fixedly connected to several springs 97 and one end of several fourth rods 98 respectively. The other ends of several fourth rods 98 pass through the first box 52 and the second box 54 respectively and are fixedly connected to one side of several seventh plates 99 respectively. The outer wall of the seventh plate 99 abuts against the inner wall of the first box 52 and the second box 54 and the surface of the filter screen 58. The ends of several springs 97 away from the fifth plates 92 are fixedly connected to the outer walls of the first box 52 and the second box 54 respectively. The sum of the elastic force of the spring 97 and the friction force of the seventh plate 99 on the inner wall of the first box 52 and the second box 54 is the first value. The torsion value of the torsion spring 93 is greater than the first value.

[0076] Specifically, under normal conditions, the fourth plate 91, the second rod 94, the torsion spring 93, and the sixth plate 95 move in a circular motion along with the conveyor network (because all components of the dust removal mechanism 9 are located inside the conveyor network, they do not affect the conveying of paper products outside the conveyor network). While these components move with the conveyor network, the fifth plate 92, under the action of the spring 97, will push the seventh plate 99 to the right side of the filter screen 58 inside the first box 52 or the second box 54 (towards...). Figure 9 (Perspective), so it will not obstruct the normal flow of gas in the first box 52 or the second box 54, nor will it affect the normal filtration of the filter screen 58;

[0077] When the fourth plate 91 moves to the right side of the fifth plate 92 along with the conveyor network (with... Figure 10 (From the perspective), at this time, the lower end of the fourth plate 91 is against one side of the upper end of the fifth plate 92. Then, because the torque value of the torsion spring 93 is greater than the first value (the sum of the elastic force of the spring 97 and the friction force of the seventh plate 99 on the inner wall of the first box 52 and the second box 54 is the first value), the fourth plate 91 will push the fifth plate 92 to the left.

[0078] When the fifth plate 92 moves, it will compress the spring 97. At the same time, the fifth plate 92 pushes the fourth rod 98 and the seventh plate 99 to move to the left. At this time, the seventh plate 99 will gradually move from the right side of the filter screen 58 to the left side of the filter screen 58. Therefore, during the movement, the debris stuck to the surface of the filter screen 58 can be pushed into another cavity without the filter screen 58 in the first box 52 or the second box 54 for temporary collection. After a period of use, the bolts between the third plate 55 and the first box 52 or the second box 54 can be loosened to process the debris in this cavity.

[0079] It should be noted here that: Figure 9 As shown, the seventh plate 99 located inside the second box 54 has an "L" shaped cross section. During the daily filtration of impurities through the filter screen 58, the vertical edge of this L-shaped seventh plate 99 is between the two filter screens 58. As the first fan 62 starts, the second pipe 64 will draw gas from the filter screen 58 on the left through the fourth pipe 53 on the second box 54.

[0080] When the fourth rod 98 is moved to the left by the force, the L-shaped seventh plate 99 moves to the left, and the horizontal edge of the L-shaped seventh plate 99 can block the filter 58 on the left side, so that the first fan 62 cannot draw air from here. At this time, the back-blowing mechanism 8 can be activated. The back-blowing mechanism 8 draws air from the filter 58 on the right side and then blows this airflow onto the lens of the vision camera 7.

[0081] It should be noted that the switching time between the two filters 58 may only be a few seconds, during which time not much debris will be sucked in (because the amount of debris adhering to the surface of paper products is very small). Therefore, it is not necessary to clean the surface of the right filter 58 frequently. Of course, a debris collection chamber can also be set on the right side of the second box 54 to collect the debris cleaned from the surface of the right filter 58. There is no specific limitation.

[0082] Furthermore, in order to enable the back-blowing mechanism 8 to clean the debris adhering to the surface of the visual camera 7 during the cleaning of debris removed by the dust removal mechanism 9 and the suction mechanism 5, as a preferred embodiment of the present invention, the back-blowing mechanism 8 includes a third tube 81, a ring 82 and a plurality of air outlets 83. One end of the third tube 81 is fixedly connected to the outer wall of the second box 54, and the other end of the third tube 81 extends into the box 1 and is connected to the outer wall of the ring 82 at the same height. The upper end of the ring 82 is fixedly connected to the outer wall of the visual camera 7. One end of each of the plurality of air outlets 83 is fixedly connected to the inner wall of the lower end of the ring 82. The third tube 81 is connected to a first cavity in the second box 54 that has a filter screen 58 and is far away from the fourth tube 53. A second fan is provided on the inner wall of the third tube 81 near the end of the second box 54.

[0083] First, it should be noted that the second fan can always be kept on. This way, when the two filters 58 are switched on the L-shaped seventh plate 99, the gas can be instantly drawn into the third pipe 81. Of course, in order to save energy and reduce the energy consumption of the second fan, a sensor can be set between the two filters 58 on the second box 54. When the L-shaped seventh plate 99 moves to switch the gas flow direction, the second fan will be turned on instantly. The specific method is not limited.

[0084] Specifically, when the L-shaped seventh plate 99 switches the airflow direction, the second fan inputs gas into the third pipe 81, then the gas passes through the third pipe 81 into the ring 82, and finally sprays it from several air outlets 83 onto the lens of the vision camera 7 to blow off the debris adhering to the surface of the vision camera 7.

[0085] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the printing quality of paper product surfaces, characterized in that, include: A mesh belt conveyor (2) is capable of conveying printed paper products to be inspected, the mesh belt conveyor (2) including a conveyor mesh; A visual camera (7) is capable of detecting the surface printing quality of paper products conveyed by the mesh belt conveyor (2); The box (1) has a visual camera (7) fixedly connected to the top surface of the inner wall of the box (1), and the detection end of the visual camera (7) faces the conveyor network. Support mechanism (3) that can support mesh belt conveyor (2) and box (1); The suction mechanism (5) can adsorb the paper products to be tested onto the conveyor surface of the mesh conveyor (2), and the suction mechanism (5) can also remove the debris in the box (1); The flattening mechanism (4) can blow away the debris on the surface of the paper product to be tested; The gas supply mechanism (6) can provide the suction mechanism (5) with the power to adsorb paper products, and the gas supply mechanism (6) can also act the gas discharged by the suction mechanism (5) on the flattening mechanism (4). The dust removal mechanism (9) can clean up the debris extracted by the suction mechanism (5) during the circulation of the conveyor network; The back-blowing mechanism (8) is able to clean debris adhering to the surface of the visual camera (7) while the dust removal mechanism (9) is cleaning debris removed by the suction mechanism (5).

2. The device for detecting the printing quality of paper product surfaces according to claim 1, characterized in that, The support mechanism (3) includes a first plate (31) and a second plate (32). The mesh belt conveyor (2) is located between the first plate (31) and the second plate (32). The upper surfaces of the first plate (31) and the second plate (32) are respectively fixedly connected to the two sides of the bottom surface of the box (1).

3. The device for detecting the printing quality of paper product surfaces according to claim 2, characterized in that, The suction mechanism (5) includes a second box (54), at least one first box (52), two partitions (56), a first rod (51) equal to the total number of the two types of boxes, a fourth tube (53) equal to the total number of the two types of boxes, a third plate (55) equal to the total number of the two types of boxes, a second flare (57) equal to the total number of the two types of boxes, and a filter (58) one more than the total number of the two types of boxes. The same end of each of the second flare (57) is fixedly connected to one end of each of the first rods (51). The other end is fixedly connected to the second plate (32). The ends of several second horn mouths (57) away from the first rod (51) are fixedly connected to the second box (54) and several first boxes (52) respectively. The other ends of the second box (54) and several first boxes (52) are fixedly connected to one end of several fourth tubes (53) respectively. One end of one of the fourth tubes (53) is connected to the air supply mechanism (6). The interior of the second box (54) forms three first cavities. The outer walls of two of the filters (58) are respectively connected to the inner walls of two of the first cavities. The first box (52) is fixedly connected to the wall, and two second cavities are formed inside the first box (52). The outer wall of one of the filter screens (58) is fixedly connected to the inner wall of one of the second cavities. The fourth tube (53) is aligned and connected to the first or second cavity with the filter screen (58) fixedly connected. Several third plates (55) are fastened to the remaining first or second cavity by bolts. One end of the dust removal mechanism (9) is located inside the first box (52) and the second box (54). The dust removal mechanism (9) and the filter screen (58) are away from the fourth tube (54). 3) The side of the back-blowing mechanism (8) is connected to the second box (54) at the end away from the visual camera (7). The outer walls of the first box (52) and the second box (54) are fixedly connected to the inner wall of the first plate (31). The suction mechanism (5) is located inside the conveyor net. The openings of several second horn mouths (57) are all facing the box (1). The two ends of the two partitions (56) are fixedly connected to the first plate (31) and the second plate (32) respectively. The second box (54) and the first box (52) are both located between the two partitions (56).

4. The device for detecting the printing quality of paper product surfaces according to claim 3, characterized in that, The flattening mechanism (4) includes a first tube (41) and a first flared mouth (42). One end of the first tube (41) is connected to the end of the gas supply mechanism (6) away from the fourth tube (53). One side of the first tube (41) is fixedly connected to one end of the first flared mouth (42). The opening of the first flared mouth (42) faces the conveyor network, and there is an inclined angle between the first flared mouth (42) and the conveyor network.

5. The device for detecting the surface printing quality of paper products according to claim 4, characterized in that, The gas supply mechanism (6) includes a multi-port pipe (61), a first fan (62), a fifth pipe body (63), and several second pipe bodies (64). Several second pipe bodies (64) are respectively fastened to one end of the fourth pipe body (53) away from the first rod body (51) through several first flanges. The other ends of several second pipe bodies (64) are respectively fixedly connected to several ends of the multi-port pipe (61). The last end of the multi-port pipe (61) is fixedly connected to the air inlet end of the first fan (62). The air outlet end of the first fan (62) is fixedly connected to one end of the fifth pipe body (63). The other end of the fifth pipe body (63) is fixedly connected to one end of the first pipe body (41). The first fan (62) is fixedly connected to the outer wall of the box (1) through a bracket.

6. The device for detecting the printing quality of paper product surfaces according to claim 5, characterized in that, The dust removal mechanism (9) includes a fourth plate (91), a torsion spring (93), a second rod (94), a third rod (96), at least two sixth plates (95), a fifth plate (92) equal in number to the two types of boxes, a spring (97) equal in number to the two types of boxes, a fourth rod (98) equal in number to the two types of boxes, and a seventh plate (99) equal in number to the two types of boxes. The upper ends of the two sixth plates (95) are fixedly connected to the side of the conveyor network near the suction mechanism (5). The lower ends of the two sixth plates (95) are respectively sleeved and fixedly connected to the outer walls of both ends of the second rod (94). One end of the fourth plate (91) is sleeved and rotatably connected to the outer wall of the second rod (94). The other end of the fourth plate (91) abuts against the upper end of one of the fifth plates (92). The torsion spring (93) is sleeved on the outside of the middle part of the second rod (94). The two ends of the torsion spring (93) are respectively connected to the fourth plate (91). The outer wall of the third rod (96) is fixedly connected to the upper end of several fifth plates (92), and the lower ends of several fifth plates (92) are fixedly connected to one end of several springs (97) and several fourth rods (98), respectively. The other ends of several fourth rods (98) pass through the first box (52) and the second box (54) and are fixedly connected to one side of several seventh plates (99), respectively. The outer wall abuts against the inner walls of the first box (52) and the second box (54) and the surface of the filter screen (58). One end of each of the springs (97) away from the fifth plate (92) is fixedly connected to the outer walls of the first box (52) and the second box (54). The sum of the elastic force of the spring (97) and the frictional force of the seventh plate (99) on the inner walls of the first box (52) and the second box (54) is a first value. The torsion value of the torsion spring (93) is greater than the first value.

7. The device for detecting the printing quality of paper product surfaces according to claim 6, characterized in that, The back-blowing mechanism (8) includes a third tube (81), a ring (82) and several air outlets (83). One end of the third tube (81) is fixedly connected to the outer wall of the second box (54). The other end of the third tube (81) extends into the box (1) and is connected to the outer wall of the ring (82). The upper end of the ring (82) is fixedly connected to the outer wall of the visual camera (7). One end of each of the several air outlets (83) is fixedly connected to the inner wall of the lower end of the ring (82). The third tube (81) is connected to a first cavity in the second box (54) that has a filter (58) and is far away from the fourth tube (53). A second fan is provided on the inner wall of the third tube (81) near the second box (54).

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