A fully automatic online paper defect detection device

Abstract

This utility model discloses a fully automatic online paper defect detection device, relating to the field of paper defect detection technology. The device includes a base on which a first paper conveyor belt, a second paper conveyor belt, and a third paper conveyor belt are mounted. A paper rejection assembly includes a guide plate with connecting frames fixedly connected to its four corners. Two second fixed supports are fixedly connected to the lower end of the guide plate, and two rotating shafts are rotatably connected to the opposing surfaces of the two second fixed supports. Multiple paper rejection plates are fixedly connected to the surfaces of the two rotating shafts. Four through slots are formed on the surface of the guide plate, and multiple paper rejection plates are driven to move collaboratively via sprockets and chains. The rejection plates, in conjunction with the guiding effect of the through slots, can quickly and accurately reject defective paper from the conveying path, avoiding the accidental rejection of normal paper. This further improves rejection reliability, reduces the risk of entire batches of products being scrapped due to defective paper contamination, and lowers economic losses for enterprises.

Description

Technical Field

[0001] This utility model relates to the field of paper defect detection technology, and in particular to a fully automatic online paper defect detection device. Background Technology

[0002] In the paper industry, paper quality directly impacts product quality and corporate profits. Currently, with the increasing demands for precision and efficiency in industrial manufacturing, paper surface defect detection equipment is gradually evolving from traditional manual inspection to intelligent and automated processes. During paper production, due to complex processes and variable environments, such as unstable lighting systems, paper machine malfunctions, improper manual operation, and uneven pulp distribution, various defects such as insects, holes, black spots, lines, wrinkles, and discoloration can easily appear on the paper surface. These defects not only affect the paper's appearance but also reduce its performance, and in severe cases, can even lead to the scrapping of an entire batch of products, causing significant economic losses to the company.

[0003] Traditional paper defect detection methods mainly rely on manual visual sampling. Manual inspection is greatly affected by subjective factors, and it is difficult to unify the judgment standards of different inspectors. Moreover, long working hours can easily lead to visual fatigue, resulting in missed or false detections, making it difficult to guarantee the accuracy and stability of the test results.

[0004] Existing machine vision-based paper defect detection devices typically use cameras to quickly photograph paper, then use computers to process and classify the images to automatically determine the presence of defects. However, in practical production applications, these devices still have many limitations. In the defective paper rejection process, common rejection structures are not well-designed; either the rejection action is not precise and efficient enough, affecting normal production processes, or the structure is complex, costly, and difficult to maintain, hindering large-scale application. Therefore, this invention proposes a novel solution. Utility Model Content

[0005] The purpose of this invention is to solve at least one of the technical problems existing in the prior art, and to provide a fully automatic online paper defect detection device that can solve the problem that in the defect paper rejection process, the common rejection structure design is not reasonable enough, either the rejection action is not precise and efficient enough, affecting the normal production process; or the structure is complex, costly, and difficult to maintain, which is not conducive to large-scale promotion and application.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fully automatic online paper defect detection device, comprising a base, on which a first paper conveyor belt, a second paper conveyor belt and a third paper conveyor belt are mounted; A paper rejection assembly is disposed between a second paper conveyor belt and a third paper conveyor belt. The paper rejection assembly includes a guide plate disposed between the second paper conveyor belt and the third paper conveyor belt. The guide plate is fixedly connected to the four corners of the guide plate. The four connecting frames are respectively connected to the corresponding second paper conveyor belt and third paper conveyor belt. The lower end of the guide plate is fixedly connected to two second fixed brackets. The opposite surfaces of the two second fixed brackets are rotatably connected to two rotating shafts. Multiple paper rejection plates are fixedly connected to the surfaces of the two rotating shafts. The surface of the guide plate has four through slots.

[0007] Preferably, the paper rejection assembly further includes two sprockets, which are respectively fixed on corresponding rotating shafts, and chains are driven onto the surfaces of the two sprockets; A drive motor is fixedly connected to the surface of the second fixed bracket on the right side, and the output end of the drive motor is connected to the corresponding rotating shaft.

[0008] Preferably, each of the multiple paper rejection plates consists of two sections, with the section of the multiple paper rejection plates closest to the corresponding rotating shaft being rod-shaped; The ends of the multiple paper rejection plates furthest from their corresponding rotating shafts are arc-shaped plate structures.

[0009] Preferably, an anti-slip pad is fixedly connected to one end of the plurality of paper rejection plates away from the corresponding rotating shaft.

[0010] Preferably, a fixed frame is fixedly connected to the upper end of the base, a telescopic cylinder is fixedly connected inside the fixed frame, a pressure roller bracket is fixedly connected to the output end of the telescopic cylinder, and a paper pressure roller is rotatably connected to the inner side of the pressure roller bracket.

[0011] Preferably, a first fixed bracket is fixedly connected to the upper end of the base. The first fixed bracket is "H" shaped, and an acrylic plate is fixedly connected to the inner side of the upper end of the first fixed bracket. The acrylic plate is inclined. The second LED light strip is fixedly connected to the horizontal plate of the first fixed bracket.

[0012] Preferably, a mounting plate is fixedly connected to the top inner side of the mounting bracket, two CCD cameras are mounted on the lower end of the mounting plate, and a first LED light strip is fixedly connected to the lower end of the mounting plate.

[0013] Preferably, the guide plate is made of stainless steel, and the surface of the guide plate is polished, while the surface of the acrylic plate is coated with an anti-glare coating.

[0014] Preferably, the surface of the paper roller is covered with a rubber layer, and the surface of the rubber layer has multiple anti-slip textures.

[0015] Preferably, the first paper conveyor belt, the second paper conveyor belt, and the third paper conveyor belt have the same conveying speed and are all driven and controlled by the same drive source.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. This fully automatic online paper defect detection device features a dual-shaft synchronous transmission design for the paper rejection component. Multiple paper rejection plates are driven to move in tandem via sprockets and chains. The combination of rod-shaped and arc-shaped plate sections on the rejection plates, along with the guiding effect of the through-slots, allows for quick and accurate rejection of defective paper from the conveyor path, preventing the accidental rejection of normal paper. Furthermore, anti-slip pads ensure that the paper does not slip during rejection, further improving rejection reliability, reducing the risk of entire batches being scrapped due to defective paper contamination, and minimizing economic losses for the company.

[0017] 2. This fully automatic online paper defect detection device replaces the traditional manual visual sampling method by using the coordinated conveying of the first, second, and third paper conveyor belts, combined with the automated image acquisition and analysis of a CCD camera. The entire process requires no human intervention, avoiding the problems of missed or false detections caused by subjective judgment differences and visual fatigue in manual inspection, significantly improving the efficiency and stability of paper defect detection results, and can meet the inspection needs of high-speed production lines.

[0018] 3. This fully automatic online paper defect detection device provides dual-light source illumination through a first LED light strip and a second LED light strip. Combined with an acrylic plate coated with an anti-glare coating, it effectively solves the problem of unstable lighting in traditional detection, reduces light reflection interference, and provides a uniform and clear shooting environment for the CCD camera. At the same time, the paper pressure roller flattens the paper, avoiding the influence of paper wrinkles on the detection results, and ensuring that even minute defects such as holes and black spots can be accurately identified. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of a fully automatic online paper defect detection device according to the present invention; Figure 2 This is a schematic diagram of the fixing frame of this utility model; Figure 3 This is a schematic diagram of the acrylic sheet of this utility model; Figure 4 This is a schematic diagram of the CCD camera of this utility model; Figure 5 This is a schematic diagram of the second LED light strip of this utility model; Figure 6 This is a schematic diagram of the guide plate of this utility model; Figure 7 This is a schematic diagram of the second fixed bracket of this utility model; Figure 8 This is a schematic diagram of the paper rejection plate of this utility model.

[0020] Reference numerals: 1. Base; 2. Fixing frame; 3. First paper conveyor belt; 4. Second paper conveyor belt; 5. Third paper conveyor belt; 6. Telescopic cylinder; 7. Pressure roller bracket; 8. Paper pressure roller; 9. First fixing bracket; 10. Acrylic plate; 11. Mounting plate; 12. CCD camera; 13. First LED light strip; 14. Second LED light strip; 15. Connecting frame; 16. Guide plate; 17. Second fixing bracket; 18. Drive motor; 19. Rotating shaft; 20. Through groove; 21. Paper rejection plate; 22. Sprocket; 23. Chain. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] Please see Figure 1-8 This utility model provides a technical solution: a fully automatic online paper defect detection device, including a base 1, on which a first paper conveyor belt 3, a second paper conveyor belt 4 and a third paper conveyor belt 5 are installed; A paper rejection assembly is disposed between the second paper conveyor belt 4 and the third paper conveyor belt 5. The paper rejection assembly includes a guide plate 16, which is disposed between the second paper conveyor belt 4 and the third paper conveyor belt 5. The guide plate 16 is fixedly connected to four corners with connecting frames 15. The four connecting frames 15 are respectively connected to the corresponding second paper conveyor belt 4 and third paper conveyor belt 5. The lower end of the guide plate 16 is fixedly connected to two second fixed brackets 17. The opposite surfaces of the two second fixed brackets 17 are rotatably connected to two rotating shafts 19. Multiple paper rejection plates 21 are fixedly connected to the surfaces of the two rotating shafts 19. The surface of the guide plate 16 has four through slots 20.

[0026] The paper rejection assembly also includes two sprockets 22, which are fixed on corresponding shafts 19. Chains 23 are driven onto the surfaces of the two sprockets 22. A drive motor 18 is fixedly connected to the surface of the second fixed bracket 17 on the right side. The output end of the drive motor 18 is connected to the corresponding shaft 19.

[0027] Each of the multiple paper rejection plates 21 consists of two sections. The section of the multiple paper rejection plates 21 closer to the corresponding rotating shaft 19 is rod-shaped, and the end of the multiple paper rejection plates 21 away from the corresponding rotating shaft 19 is an arc-shaped plate structure.

[0028] Multiple paper rejection plates 21 are fixedly connected to an anti-slip pad at one end away from the corresponding rotating shaft 19.

[0029] A fixed frame 2 is fixedly connected to the upper end of the base 1. A telescopic cylinder 6 is fixedly connected inside the fixed frame 2. A pressure roller bracket 7 is fixedly connected to the output end of the telescopic cylinder 6. A paper pressure roller 8 is rotatably connected to the inner side of the pressure roller bracket 7.

[0030] The upper end of the base 1 is fixedly connected to a first fixed bracket 9, which is "H" shaped. An acrylic plate 10 is fixedly connected to the inner side of the upper end of the first fixed bracket 9. The acrylic plate 10 is inclined. A second LED light strip 14 is fixedly connected to the horizontal plate of the first fixed bracket 9.

[0031] A mounting plate 11 is fixedly connected to the top inner side of the mounting bracket 2. Two CCD cameras 12 are mounted on the lower end of the mounting plate 11, and a first LED light strip 13 is fixedly connected to the lower end of the mounting plate 11.

[0032] The deflector plate 16 is made of stainless steel and its surface is polished. The surface of the acrylic plate 10 is coated with an anti-glare coating.

[0033] The surface of the paper pressure roller 8 is covered with a rubber layer, and the surface of the rubber layer has multiple anti-slip textures.

[0034] The first paper conveyor belt 3, the second paper conveyor belt 4, and the third paper conveyor belt 5 all have the same conveying speed and are all driven and controlled by the same drive source.

[0035] When using this device, during operation, the paper to be tested is first conveyed to the first paper conveyor belt 3. Since the first paper conveyor belt 3, the second paper conveyor belt 4 and the third paper conveyor belt 5 have the same conveying speed and are driven and controlled by the same drive source, the paper can be smoothly conveyed from the first paper conveyor belt 3 to the second paper conveyor belt 4.

[0036] When the paper enters the area of ​​the second paper conveyor belt 4, the telescopic cylinder 6 inside the fixed frame 2 will extend and retract according to the thickness of the paper, driving the pressure roller bracket 7 and the paper pressure roller 8 inside it to move up and down, so that the paper pressure roller 8 gently presses on the surface of the paper; the rubber layer with anti-slip texture wrapped on the surface of the paper pressure roller 8 can not only prevent the paper from slipping and shifting during the conveying process, but also play a certain role in flattening the paper, ensuring that the paper enters the detection area flat.

[0037] At this time, the two CCD cameras 12 installed at the lower end of the mounting plate 11 begin to photograph and detect the paper surface; at the same time, the first LED light strip 13 lights up, providing sufficient and stable illumination for the detection area, ensuring that the CCD camera 12 can clearly capture the image of the paper surface; while the second LED light strip 14 on the first fixed bracket 9, together with the inclined acrylic plate 10, the anti-glare coating on the surface of the acrylic plate 10 can reduce light reflection interference, further optimize the lighting environment of the detection area, and improve the recognition accuracy of the CCD camera 12 for paper surface defects (such as holes, black spots, etc.).

[0038] If the CCD camera 12 detects a defect in the paper, it will transmit a signal to the control system. When the defective paper is conveyed to the guide plate 16 between the second paper conveyor belt 4 and the third paper conveyor belt 5, the control system will start the drive motor 18. The drive motor 18 drives the corresponding rotating shaft 19 to rotate. Through the transmission action of the two sprockets 22 and the chain 23, the other rotating shaft 19 also rotates synchronously.

[0039] Multiple paper rejection plates 21 on the surfaces of the two rotating shafts 19 rotate accordingly. The rod-shaped section of the paper rejection plate 21 near the rotating shaft 19 can rotate flexibly within the through groove 20, while the arc-shaped plate-shaped section away from the rotating shaft 19 extends out of the surface of the guide plate 16 through the through groove 20. During rotation, the anti-slip pads at the ends of the arc-shaped plate-shaped sections contact the defective paper and remove it from the normal conveying path. The defect-free paper will pass smoothly through the guide plate 16 and continue to be conveyed to the third paper conveyor belt 5 to complete the subsequent processing.

[0040] The entire process achieves fully automated online operation from paper feeding and detection to defect rejection, improving the efficiency and accuracy of paper defect detection and reducing errors and fatigue caused by manual operation.

[0041] Furthermore, the paper rejection assembly adopts a dual-shaft synchronous transmission design 19, which drives multiple paper rejection plates 21 to work together via sprockets 22 and chains 23. The combination of rod-shaped and arc-shaped plate-shaped sections of the paper rejection plates 21, along with the guiding effect of the through slots 20, can quickly and accurately reject defective paper from the conveying path, avoiding the mistaken rejection of normal paper. In addition, the anti-slip pads ensure that the paper does not slip during the rejection process, further improving rejection reliability, reducing the risk of scrapping the entire batch of products due to defective paper mixing, and reducing economic losses for the enterprise.

[0042] The device replaces the traditional manual visual inspection method by coordinating the transport of paper through the first paper conveyor belt 3, the second paper conveyor belt 4, and the third paper conveyor belt 5, combined with the automated image acquisition and analysis of the CCD camera 12. The entire process requires no human intervention, avoiding the problems of missed detection and false detection caused by subjective judgment differences and visual fatigue in manual inspection, significantly improving the efficiency and stability of paper defect detection, and can meet the inspection needs of high-speed production lines.

[0043] The device provides dual-source illumination through the first LED light strip 13 and the second LED light strip 14. Combined with the acrylic plate 10 with an anti-glare coating, it effectively solves the problem of unstable illumination in traditional detection, reduces light reflection interference, and provides a uniform and clear shooting environment for the CCD camera 12. At the same time, the paper pressure roller 8 flattens the paper, avoiding the influence of paper wrinkles on the detection results and ensuring that minute defects such as holes and black spots can be accurately identified.

[0044] Structural Description: Base 1: As the basic support component of the entire device, it provides an installation platform for all other structures and ensures the overall stability of the device; First paper conveyor belt 3, second paper conveyor belt 4, and third paper conveyor belt 5: The three conveyor belts have the same conveying speed and are controlled by the same drive source. They work together to complete the continuous conveying of paper and are respectively responsible for the initial conveying, conveying in the inspection area, and conveying after defect detection, so as to ensure the smooth flow of paper. Fixed frame 2, telescopic cylinder 6, pressure roller bracket 7, paper pressure roller 8: Fixed frame 2 provides the mounting base for telescopic cylinder 6; telescopic cylinder 6 can extend and retract according to the paper thickness, and drives paper pressure roller 8 to move up and down through pressure roller bracket 7, so that paper pressure roller 8 gently presses on the paper surface; the surface of paper pressure roller 8 is covered with a rubber layer with anti-slip texture, which can not only prevent the paper from slipping and shifting, but also flatten the paper and ensure that the paper enters the inspection area flat; First fixed bracket 9, acrylic plate 10, and second LED light strip 14: The first fixed bracket 9 is "H" shaped to provide installation support for the acrylic plate 10 and the second LED light strip 14; the inclined acrylic plate 10, in conjunction with the second LED light strip 14, has an anti-glare coating on its surface to reduce light reflection interference and optimize the illumination of the detection area; the second LED light strip 14 provides supplementary illumination to the detection area; Mounting plate 11, CCD camera 12, first LED light strip 13: Mounting plate 11 is used to mount CCD camera 12 and first LED light strip 13; the two CCD cameras 12 are responsible for shooting and detecting the paper surface to identify defects such as holes and black spots; the first LED light strip 13 provides sufficient and stable illumination for the detection area to ensure that the CCD camera 12 captures images clearly. Guide plate 16 and connecting frame 15: The guide plate 16 is made of stainless steel with a polished surface and is located between the second and third paper conveyor belts, serving to guide the paper conveying; the connecting frame 15 connects and fixes the four corners of the guide plate 16 to the corresponding conveyor belts. Second fixed bracket 17, rotating shaft 19, paper rejection plate 21, through groove 20: The second fixed bracket 17 provides rotational support for the rotating shaft 19; the two rotating shafts 19 rotate under drive, driving the multiple paper rejection plates 21 on the surface to move; the rod-shaped section of the paper rejection plate 21 can rotate flexibly in the through groove 20, and the arc-shaped plate-shaped section extends out of the guide plate surface through the through groove 20, and with the anti-slip pad at the end, rejects defective paper from the conveying path; the through groove 20 provides guidance for the rotation of the paper rejection plate 21; Sprocket 22, chain 23, drive motor 18: Drive motor 18 provides power for the rotation of shaft 19. Through the transmission of sprocket 22 and chain 23, the two shafts 19 rotate synchronously, ensuring that the paper rejection plate 21 works in coordination.

[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A fully automatic on-line paper defect detection apparatus characterized in that: Includes a base (1), on which a first paper conveyor belt (3), a second paper conveyor belt (4) and a third paper conveyor belt (5) are mounted; A paper rejection assembly is disposed between a second paper conveyor belt (4) and a third paper conveyor belt (5). The paper rejection assembly includes a guide plate (16) disposed between the second paper conveyor belt (4) and the third paper conveyor belt (5). The guide plate (16) is fixedly connected to the four corners of the four corners of the four corners of the guide plate (16). The four corners of the guide plate (16) are respectively connected to the corresponding second paper conveyor belt (4) and third paper conveyor belt (5). The lower end of the guide plate (16) is fixedly connected to two second fixed brackets (17). The opposite surfaces of the two second fixed brackets (17) are rotatably connected to two rotating shafts (19). The surfaces of the two rotating shafts (19) are fixedly connected to multiple paper rejection plates (21). The surface of the guide plate (16) has four through slots (20).

2. A fully automatic on-line paper defect detection apparatus according to claim 1, characterized in that: The paper rejection assembly also includes two sprockets (22), which are fixed on corresponding rotating shafts (19) respectively, and chains (23) are driven onto the surfaces of the two sprockets (22). A drive motor (18) is fixedly connected to the surface of the second fixed bracket (17) on the right side, and the output end of the drive motor (18) is connected to the corresponding rotating shaft (19).

3. A fully automatic on-line paper defect detection apparatus according to claim 1, characterized in that: Each of the multiple paper rejection plates (21) consists of two sections, with the section of the multiple paper rejection plates (21) near the corresponding rotating shaft (19) being rod-shaped; The end of the multiple paper rejection plates (21) away from the corresponding pivot (19) is an arc-shaped plate structure.

4. A fully automatic on-line paper defect detection apparatus according to claim 3, characterized in that: An anti-slip pad is fixedly connected to one end of each of the multiple paper rejection plates (21) away from the corresponding pivot (19).

5. The fully automatic on-line paper defect detection apparatus according to claim 1, wherein: The upper end of the base (1) is fixedly connected to a fixed frame (2), and the inside of the fixed frame (2) is fixedly connected to a telescopic cylinder (6). The output end of the telescopic cylinder (6) is fixedly connected to a pressure roller bracket (7), and the inner side of the pressure roller bracket (7) is rotatably connected to a paper pressure roller (8).

6. A fully automatic on-line paper defect detection apparatus according to claim 1, characterized in that: The upper end of the base (1) is fixedly connected to a first fixed bracket (9), which is "H" shaped. An acrylic plate (10) is fixedly connected to the inner side of the upper end of the first fixed bracket (9), which is inclined. The second LED light strip (14) is fixedly connected to the horizontal plate of the first fixed bracket (9).

7. A fully automatic on-line paper defect detection apparatus according to claim 5, characterized in that: The mounting plate (11) is fixedly connected to the top inner side of the mounting bracket (2). Two CCD cameras (12) are mounted on the lower end of the mounting plate (11). The first LED light strip (13) is fixedly connected to the lower end of the mounting plate (11).

8. The fully automatic on-line paper defect detection apparatus according to claim 1, wherein: The guide plate (16) is made of stainless steel and the surface of the guide plate (16) has been polished. The surface of the acrylic plate (10) is coated with an anti-glare coating.

9. A fully automatic on-line paper defect detection apparatus according to claim 5, characterized in that: The surface of the paper roller (8) is covered with a rubber layer, and the surface of the rubber layer has multiple anti-slip textures.

10. The fully automatic on-line paper defect detection apparatus according to claim 1, wherein: The first paper conveyor belt (3), the second paper conveyor belt (4) and the third paper conveyor belt (5) have the same conveying speed and are all driven and controlled by the same drive source.

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