A device for detecting a scratch defect of a printed product

Abstract

The utility model discloses a kind of detection devices of printing product scratch defect, it is related to printing product detection field, its technical solution main point is: including base, and the detection cabinet of being located above base and two sides opening, detector device is set in the detection cabinet, the top end of the base is also installed with the reciprocating mechanism of driving for placing the back-and-forth movement of multiple limit groove seats of printing product, so that limit groove seat enters detection cabinet one by one, the scratch defect of printing product on it is detected by detector device, the both sides of the limit groove seat are fixedly connected with baffle, effect is the multiple limit groove seats of placing printing product rely on the reciprocating mechanism drive of base top end, move one by one according to established order;When limit groove seat enters detection cabinet, the baffle fixedly connected with its both sides synchronously closes the both sides opening of detection cabinet, form a relatively closed detection space, effectively isolate extraneous stray light interference.

Description

Technical Field

[0001] This utility model relates to the field of printed product inspection, and more specifically, it relates to a device for detecting scratch defects in printed products. Background Technology

[0002] In the printing industry, the surface quality of printed products is of paramount importance, and accurate detection of scratches and defects is a key step in ensuring product quality.

[0003] Currently, most scratch defect detection devices for printed products on the market adopt open or semi-open detection structures, without effectively sealing the detection area. This allows stray light from the outside to easily enter the detection area during the detection process, interfering with the normal operation of the image acquisition equipment and causing light and shadow errors in the acquired printed product images. This reduces the accuracy of scratch defect identification. At the same time, the unsealed detection space is not conducive to the uniform distribution and stable control of the light source inside the detection device, making it difficult to ensure the consistency of detection conditions, resulting in poor reliability and stability of the detection results.

[0004] Therefore, in order to solve the above-mentioned technical problems, this application proposes a device for detecting scratch defects in printed materials. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device for detecting scratch defects in printed products.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a detection device for scratch defects in printed products, comprising a base and a detection cabinet located above the base with openings on both sides. Detection devices are installed inside the detection cabinet. A reciprocating mechanism is also installed at the top of the base to drive multiple limiting slots for placing printed products to move back and forth, so that the limiting slots enter the detection cabinet one by one. The detection devices detect scratch defects in the printed products on them. Baffles are fixedly connected to both sides of each limiting slot to close the openings on both sides of the detection cabinet after the limiting slots enter the detection cabinet.

[0007] Preferably, the reciprocating mechanism includes an upper open slot fixed to the top of the base, and a lead screw driven by a motor is installed at one end of the upper open slot. A rod sleeve is threaded onto the outer wall of the lead screw. A vertical plate is fixedly connected to the top of the rod sleeve. The surface of the vertical plate is fixed to a baffle through a connecting rod. Sliding components for maintaining the linear movement of the vertical plate are also installed on both sides of the testing cabinet. The testing cabinet is fixed to the top of the upper open slot.

[0008] Preferably, the sliding component includes guide rails connected to the top of the base via a support plate and located on both sides of the upper open slot seat, and the two sides of the baffle are slidably connected to the guide rails via sliders.

[0009] Preferably, bearings are embedded and fixed on both sides of the upper open slot seat, and a rotating rod is fixedly connected to the inner ring of the bearing. The lead screw is fixed between the two rotating rods, and the motor drives the rotation of one of the rotating rods. The motor is connected to the side end of the upper open slot seat through an L-shaped plate.

[0010] Preferably, the testing cabinet and the upper opening slot are detachably connected.

[0011] Preferably, screws are fixedly connected to both sides of the bottom of the testing cabinet, and connecting plates with through holes are fixedly connected to both sides of the upper open slot seat. Nuts are threaded onto the outer side wall of the screws.

[0012] Preferably, the base is made of cast iron counterweight material and has anti-slip pads on its bottom.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. In this utility model, multiple limiting slots for placing printed products are driven by a reciprocating mechanism at the top of the base and move one by one in a predetermined order. When the limiting slots enter the inspection cabinet, the baffles fixedly connected to both sides of the cabinet simultaneously close the openings on both sides of the inspection cabinet, forming a relatively closed inspection space and effectively isolating external stray light interference. The inspection device inside the inspection cabinet, in a closed environment, uses a stable and uniform internal light source to inspect the printed products on the limiting slots, thereby solving the problem of effective sealing in most printed product scratch defect inspection devices on the market in the background art. 2. This utility model designs the testing cabinet and the upper opening slot seat to be detachably connected. In this way, when the testing device in the testing cabinet malfunctions or needs to be upgraded, the testing cabinet can be quickly disassembled for repair, replacement or update of the testing device without the need for complex disassembly of the entire device, which greatly shortens the maintenance time and improves the equipment utilization rate. 3. When the lead screw rotates, the rotating rods at both ends of the present invention will also drive the inner ring of the bearing to rotate. The inner ring of the bearing rotates along with its outer ring. In this way, the bearing can provide a stable and low-friction support structure for the lead screw, reduce the radial wobble when the lead screw rotates, ensure its coaxiality when rotating at high speed, and improve the smoothness of the reciprocating mechanism. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1Another perspective on the specific structure; Figure 3 This utility model Figure 1 Another angle of the specific structural diagram; Figure 4 This utility model Figure 3 Enlarged view of the local structure of A; Figure 5 This is a schematic diagram of the internal structure of the upper opening groove seat in this utility model.

[0015] In the diagram: 1. Base; 2. Inspection cabinet; 3. Anti-slip pad; 4. Reciprocating mechanism; 401. Upper opening slot seat; 402. Motor; 403. Lead screw; 404. Rod sleeve; 405. Vertical plate; 406. Sliding component; 4061. Guide rail; 4062. Slider; 4063. Support plate; 407. Bearing; 408. Rotating rod; 409. L-shaped plate; 410. Connecting rod; 5. Limiting slot seat; 6. Baffle; 7. Screw; 8. Connecting plate; 9. Through hole; 10. Nut. Detailed Implementation

[0016] like Figure 1-5 As shown, this utility model provides a detection device for scratch defects in printed products, including a base 1 and a detection cabinet 2 located above the base 1 with openings on both sides. The detection cabinet 2 is equipped with detection devices. The top of the base 1 is also equipped with a reciprocating mechanism 4 that drives multiple limiting slots 5 for placing printed products to move back and forth, so that the limiting slots 5 enter the detection cabinet 2 one by one. The detection devices detect the scratch defects of the printed products on them. Baffles 6 are fixedly connected to both sides of the limiting slots 5 to close the openings on both sides of the detection cabinet 2 after the limiting slots 5 enter the detection cabinet 2.

[0017] During inspection, multiple limiting slots 5 for placing printed products are driven by the reciprocating mechanism 4 at the top of the base 1, moving one by one in a predetermined order. When a limiting slot 5 enters the inspection cabinet 2, the baffles 6 fixedly connected to its two sides simultaneously close the openings on both sides of the inspection cabinet 2, forming a relatively sealed inspection space, effectively isolating external stray light interference. In the closed environment, the inspection device inside the inspection cabinet 2 uses a stable and uniform internal light source to inspect the printed products on the limiting slots 5. By analyzing and processing the acquired images, scratch defects on the surface of the printed products are identified, completing one inspection process. Then, the second limiting slot 5 is moved into the inspection cabinet 2 for inspection, and so on, thereby achieving efficient and accurate detection of scratch defects on printed products.

[0018] The detection devices include: Image acquisition mechanism: Typically an industrial camera, either an area scan camera or a line scan camera can be selected. An area scan camera can acquire an image of the entire printed product in one scan, suitable for smaller printed products where inspection speed requirements are not particularly high; a line scan camera can scan and acquire images line by line while the printed product is moving at high speed, suitable for inspecting large-format or high-speed transport printed products. Optical lenses are used in conjunction with the camera for clear imaging, enabling the camera to capture minute scratches and details on the surface of the printed product.

[0019] Light source mechanism: Provides suitable illumination for image acquisition, highlights surface details of printed materials, and reduces noise interference. Different types of light sources, such as strip light sources and ring light sources, can be selected according to the material, color, and surface characteristics of the printed materials to ensure a clear contrast between scratches and the background, facilitating clear image acquisition by the camera.

[0020] Image processing and analysis system: This can be PC-based image processing software combined with a processor, or a dedicated vision processing unit. The system utilizes image processing algorithms, such as deep learning-based algorithms, or traditional methods like image difference, histogram interpolation, and cross-correlation matching. By preprocessing images acquired by industrial cameras (e.g., image filtering, grayscale correction), extracting features (e.g., edge detection, texture analysis), and determining defects (comparing to preset standards or judging based on thresholds), it identifies scratches and defects on printed materials.

[0021] Electrical control mechanism: used to control the operation of various parts of the testing device, including cooperating with the reciprocating mechanism 4 to realize the signal trigger when the limit slot seat 5 enters the testing cabinet 2, controlling the shooting timing of the industrial camera, the switching on and off of the light source and the brightness adjustment, etc., to ensure that the entire testing process is automated and orderly.

[0022] Data transmission and storage devices: The image acquisition card can receive image data from industrial cameras and transmit it to the image processing system. It may also be equipped with storage devices such as hard drives to store the acquired image data and inspection results for subsequent retrieval, statistical analysis, and quality traceability.

[0023] The following is the specific structure of the reciprocating mechanism 4: The reciprocating mechanism 4 includes an upper open slot seat 401 fixed to the top of the base 1, and a lead screw 403 driven by a motor 402 is installed at one end of the upper open slot seat 401. A rod sleeve 404 is threadedly connected to the outer wall of the lead screw 403. A vertical plate 405 is fixedly connected to the top of the rod sleeve 404. The surface of the vertical plate 405 is fixed to the baffle 6 through a connecting rod 410. Sliding components 406 for maintaining the linear movement of the vertical plate 405 are also installed on both sides of the detection cabinet 2. The detection cabinet 2 is fixed to the top of the upper open slot seat 401. The sliding component 406 includes a guide rail 4061 connected to the top of the base 1 through a support plate 4063 and located on both sides of the upper open slot seat 401. The two sides of the baffle 6 are slidably connected to the guide rail 4061 through a slider 4062.

[0024] After the motor 402 starts, it drives the lead screw 403 to rotate. The sleeve 404, which is threadedly connected to the lead screw 403, moves along the axis of the lead screw 403 under the action of threaded transmission, driving the vertical plate 405 fixed at the top of the sleeve 404 to move synchronously. The vertical plate 405 is connected to the baffles 6 on both sides of the limiting slot seat 5 through the connecting rod 410, so that the limiting slot seat 5 and the printed products on it move in a straight line under the constraint of the sliding component 406. Specifically, the sliders 4062 on both sides of the baffle 6 slide in a straight line along the guide rails 4061 on both sides of the upper opening slot seat 401 to ensure the stability of movement. When the limiting slot... After seat 5 enters the inspection cabinet 2, baffle 6 closes the openings on both sides of the inspection cabinet 2. The inspection device inside the inspection cabinet 2 performs scratch defect inspection on the printed products. After the inspection of a printed product on a limit slot seat 5 is completed, the motor 402 continues to drive the lead screw 403 to rotate, causing the limit slot seat 5 to move out of the inspection cabinet 2. After all the printed products on the limit slot seats 5 have completed the first inspection, a new printed product is put back into the limit slot seat 5. The motor 402 rotates the lead screw 403 in the opposite direction, driving the limit slot seat 5 to move in the opposite direction, so that it enters the inspection cabinet 2 again in sequence, and repeats the above closed inspection process.

[0025] Furthermore, bearings 407 are embedded and fixed on both sides of the upper open slot seat 401, and rotating rods 408 are fixedly connected to the inner ring of the bearings 407. The lead screw 403 is fixed between the two rotating rods 408. The motor 402 drives the rotation of one of the rotating rods 408. The motor 402 is connected to the side end of the upper open slot seat 401 through the L-shaped plate 409. That is, when the lead screw 403 rotates, the rotating rods 408 at both ends will also drive the inner ring of the bearing 407 to rotate. The inner ring of the bearing 407 rotates along with its outer ring. In this way, the bearing 407 can provide a stable and low-friction support structure for the lead screw 403, reducing the friction of the lead screw 403. The radial wobble during operation ensures coaxiality during high-speed rotation, improving the smoothness of the reciprocating mechanism 4. Meanwhile, the base 1 is made of cast iron counterweight material, with anti-slip pads 3 at its bottom. The cast iron counterweight material has high density and strength, which can significantly increase the weight of the base 1 itself, providing a stable support foundation for the entire testing device. This effectively resists the vibration and inertial force generated during the operation of the reciprocating mechanism 4, preventing the device from shifting or shaking due to uneven force, and ensuring the stability of the testing process. The anti-slip pads 3 at the bottom further prevent the device from sliding by increasing the friction with the ground, making it especially suitable for industrial environments with complex ground conditions.

[0026] Finally, the utility model also designs the testing cabinet 2 and the upper opening slot 401 to be detachably connected. In this way, when the testing device in the testing cabinet 2 malfunctions or needs to be upgraded, the testing cabinet 2 can be quickly disassembled for repair, replacement or update of the testing device without the need for complex disassembly of the entire device, which greatly shortens the maintenance time and improves the equipment utilization rate. On the other hand, during the transportation or storage of the device, the detachable structure can separate the testing cabinet 2 from the upper opening slot 401, reduce the overall volume, reduce the difficulty of transportation and space occupation, and at the same time avoid damage to the precision components in the testing cabinet 2 caused by transportation bumps. The specific structure of the detachable structure is as follows: the bottom of the testing cabinet 2 is fixedly connected to both sides with screws 7, and the upper opening slot 401 is fixedly connected to both sides with connecting plates 8 having through holes 9. Nuts 10 are threadedly connected to the outer side wall of the screws 7.

[0027] The screw 7 below the test cabinet 2 is passed through the through holes 9 on the connecting plates 8 on both sides of the upper open slot seat 401. Then, the nut 10 is rotated clockwise to install the nut 10 on the screw 7. The nut 10 moves upward and slowly abuts against the bottom of the connecting plate 8, thus completing the connection between the test cabinet 2 and the upper open slot seat 401. Conversely, the nut 10 is removed to separate the upper open slot seat 401 from the test cabinet 2.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A device for detecting scratch defects in printed materials, characterized in that: The device includes a base (1) and a testing cabinet (2) located above the base (1) with openings on both sides. The testing cabinet (2) is equipped with testing devices. The top of the base (1) is also equipped with a reciprocating mechanism (4) that drives multiple limiting slots (5) for placing printed products to move back and forth, so that the limiting slots (5) enter the testing cabinet (2) one by one. The testing devices detect the scratch defects of the printed products on them. Both sides of the limiting slots (5) are fixedly connected with baffles (6) to close the openings on both sides of the testing cabinet (2) after the limiting slots (5) enter the testing cabinet (2).

2. The device for detecting scratch defects in printed products according to claim 1, characterized in that: The reciprocating mechanism (4) includes an upper open slot seat (401) fixed to the top of the base (1), and a lead screw (403) driven by a motor (402) is installed at one end of the upper open slot seat (401). A rod sleeve (404) is threaded on the outer side wall of the lead screw (403). A vertical plate (405) is fixedly connected to the top of the rod sleeve (404). The surface of the vertical plate (405) is fixed to the baffle (6) by a connecting rod (410). Sliding components (406) for maintaining the linear movement of the vertical plate (405) are also installed on both sides of the detection cabinet (2). The detection cabinet (2) is fixed to the top of the upper open slot seat (401).

3. The device for detecting scratch defects in printed products according to claim 2, characterized in that: The sliding component (406) includes a guide rail (4061) connected to the top of the base (1) via a support plate (4063) and located on both sides of the upper opening slot seat (401). The two sides of the baffle (6) are slidably connected to the guide rail (4061) via a slider (4062).

4. The device for detecting scratch defects in printed products according to claim 2, characterized in that: Bearings (407) are embedded and fixed on both sides of the upper open slot seat (401), and a rotating rod (408) is fixedly connected in the inner ring of the bearing (407). The lead screw (403) is fixed between the two rotating rods (408). The motor (402) drives one of the rotating rods (408) to rotate. The motor (402) is connected to the side end of the upper open slot seat (401) through an L-shaped plate (409).

5. The device for detecting scratch defects in printed products according to claim 2, characterized in that: The testing cabinet (2) is detachably connected to the upper opening slot (401).

6. The device for detecting scratch defects in printed products according to claim 5, characterized in that: The bottom of the testing cabinet (2) is fixedly connected to two screws (7), and the upper opening slot seat (401) is fixedly connected to two connecting plates (8) with through holes (9) on both sides. Nuts (10) are threaded onto the outer side wall of the screw (7).

7. The device for detecting scratch defects in printed products according to claim 1, characterized in that: The base (1) is made of cast iron counterweight material and has anti-slip pads (3) at its bottom.

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