Playing card quality inspection machine

Abstract

A playing card quality inspection machine comprises a machine frame, an input device, a deviation rectifying mechanism, an image collecting device, an image processing device and a classification executing device, and the input device, the deviation rectifying mechanism, the image collecting device, the image processing device and the classification executing device are integrated on the machine frame. The first camera is arranged above the lower suction platform to collect front images of the paper, the second camera is arranged below the upper suction platform to collect back images, and the suction holes are formed to fix the paper, so that high-definition collection of the front and back sides is realized. The image processing device is connected with the double cameras, and is used for synchronously analyzing images, identifying defect types and grading based on a preset multi-stage defect judgment rule; the classification execution device is located at the downstream of the image acquisition device and comprises a certified product containing bin, a waste cleaning containing bin and at least one grading containing bin, sorting mechanisms corresponding to the containing bins are in signal linkage with the image processing device, paper is dynamically guided to the corresponding containing bins according to defect grades, and when sorting is not triggered, the paper enters the certified product bin along a default path. According to the device, the problems that traditional equipment is incomplete in detection and extensive in sorting are solved through the double-visual-angle detection and multi-stage classification technology, and the automation and refinement level of playing card production quality control is improved.

Description

Technical Field

[0001] This utility model relates to the field of playing card production technology, specifically to a quality inspection machine for inspecting semi-finished playing cards. Background Technology

[0002] In the production process of playing cards, double-sided quality inspection of uncut paper is a core step in ensuring the yield rate. However, existing inspection equipment has significant technical shortcomings in both image acquisition and defect classification, specifically as follows: In terms of image acquisition, traditional equipment generally uses a single-sided camera inspection mode, which can only acquire images from a single perspective of the front or back of the paper, and cannot simultaneously complete defect screening on both sides. Since both sides of playing cards are printed with key patterns such as suits and numbers, problems such as ink stains, missing prints, and paper damage on the back are easily missed, leading to potential quality issues in the subsequently cut individual playing cards.

[0003] Regarding defect classification, existing equipment relies on fixed threshold judgments, making it impossible to flexibly adjust defect grading standards according to production needs. For example, it cannot perform multi-level classification and screening for different types of defects such as pattern misalignment and color deviation; it can only be simply distinguished as "qualified" or "unqualified." This is particularly problematic in terms of paper size, where variations in shrinkage can lead to size differences, which existing equipment struggles to accurately sort out. In reality, these dimensionally inconsistent papers can be cut and adapted using a matching cutting head, allowing for reuse. However, due to the limitations of existing equipment, this can only be addressed through post-processing screening, increasing the cost of manual secondary screening.

[0004] Therefore, how to provide a detection device based on dual-view high-definition image acquisition and dynamic threshold classification, which can realize simultaneous detection of both sides of paper through cameras arranged vertically, and combined with configurable multi-level defect judgment rules and precise flip-board control technology, to solve the problems of incomplete detection and inflexible classification of existing equipment, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a playing card inspection machine that has dual-view high-definition image acquisition function, multi-level defect judgment rules and precise flip-plate control technology, so as to realize simultaneous detection and flexible classification of both sides of paper, in view of the above-mentioned existing technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: it includes a frame, and also includes...

[0007] The input device includes a suction cup that can adsorb paper, and separates uncut sheets of paper in a stacked state one by one by adsorption and movement of the suction cup, and outputs the paper downstream.

[0008] The correction mechanism is connected to the input device and receives the separated paper, and corrects the paper's placement position in real time during the conveying process to prevent deviation.

[0009] An image acquisition device includes a lower suction platform and an upper suction platform. A first camera is provided above the lower suction platform to acquire an image of the front of the paper, and a second camera is provided below the upper suction platform to acquire an image of the back of the paper.

[0010] An image processing device, connected to the image acquisition device, is used to receive images of both sides of the paper and to perform synchronous analysis according to a preset multi-level defect judgment rule to identify the defect type and determine its level.

[0011] The sorting execution device is connected downstream of the image acquisition device and includes a good product storage bin, a waste storage bin and at least one graded storage bin, as well as sorting mechanisms corresponding to the waste storage bin and graded storage bin respectively. Each sorting mechanism is signal-connected to the image processing device and dynamically guides the paper to the corresponding waste storage bin or graded storage bin according to the identified defect level.

[0012] The correction mechanism, the lower suction platform, the upper suction platform, and the sorting execution device form a continuous conveying path through the transmission belts arranged on the frame and connected to each other, so as to ensure that the paper can be transferred sequentially between the modules. When the sorting mechanism is not triggered, the paper enters the good product receiving bin along the default path.

[0013] To ensure that the paper is placed in the correct position during the conveying process and to avoid inaccurate image acquisition due to positional deviation, the correction mechanism preferably includes a horizontally conveying inclined conveyor belt, a reference plate disposed on the side of the inclined conveyor belt, and a limiting template disposed above the inclined conveyor belt.

[0014] The inclined conveyor belt is arranged in the horizontal plane at a preset inclination angle toward the reference plate, so that the paper gradually adheres to the reference plate under the action of the conveying direction force during the horizontal conveying process.

[0015] The limiting template and the inclined conveyor belt form a limiting gap that allows only a single sheet of paper to pass through. When the paper passes through the limiting gap, its edge makes full contact with the reference plate to complete the position correction, while ensuring that the paper is always in a single-sheet separated state.

[0016] To better capture the front image of the paper and ensure that the front image is clear and accurate, preferably, the suction platform includes a suction conveyor belt arranged along the paper conveying direction. The suction conveyor belt is provided with a plurality of suction adsorption holes that penetrate along the thickness direction. At least one negative pressure suction device is also provided below the suction conveyor belt. The air inlet of the negative pressure suction device is connected to the suction adsorption holes.

[0017] When the downward suction conveyor belt is in operation, the negative pressure downward suction device generates negative pressure suction force through the downward suction adsorption hole, fixing the back of the paper to the upper surface of the downward suction conveyor belt, while fully exposing the front of the paper so that the first camera located above can capture the image of the front of the paper.

[0018] In order to better capture images of the reverse side of the paper and ensure that the reverse images are clear and accurate, preferably, the upper suction platform includes an upper suction conveyor belt arranged along the paper conveying direction. The upper suction conveyor belt is provided with a plurality of upper suction adsorption holes that penetrate along the thickness direction. At least one negative pressure upper suction device is also provided above the upper suction conveyor belt. The air inlet of the negative pressure upper suction device is connected to the upper suction adsorption holes.

[0019] When the upper suction conveyor belt is in operation, the negative pressure upper suction device generates negative pressure suction force through the upper suction suction hole, fixing the front of the paper to the lower surface of the upper suction conveyor belt, while completely exposing the back of the paper so that the second camera located below can capture the image of the back of the paper.

[0020] In order to achieve accurate classification based on paper defect level and improve the sorting efficiency of the inspection machine, preferably, multiple sets of horizontally arranged transmission belts are arranged sequentially downstream of the image acquisition device along the paper conveying direction, with a gap between adjacent transmission belt sets.

[0021] The sorting mechanism includes a flap and an inclined guide plate. The waste collection bin and the grading collection bin are both located on the side below the corresponding interval and are connected to the interval through the inclined guide plate. The inclination angle of the inclined guide plate is adapted to the misalignment distance of the corresponding collection bin.

[0022] Each interval is equipped with the aforementioned flap, and the flipping axis of the flap is parallel to the width direction of the transmission belt;

[0023] When the flap is open, the paper is detached from the conveyor belt assembly at the interval and slides into the corresponding waste collection bin or grading bin via the inclined guide plate. When the flap is closed, the paper continues to be conveyed along the extension direction of the conveyor belt assembly and enters the good product collection bin through the default path.

[0024] To further ensure that the paper can slide smoothly and quickly into the corresponding receiving bin, preferably, the surface of the inclined guide plate is provided with an auxiliary conveyor belt, the running direction of which is consistent with the inclination direction of the inclined guide plate, to assist the paper in sliding smoothly into the corresponding receiving bin along the inclined guide plate.

[0025] In order to enable the flexible opening and closing of the flap and ensure accurate paper sorting, preferably, the cross-section of the flap is V-shaped, and the flap is provided with a rotating shaft perpendicular to the paper transmission direction. The rotating shaft is connected to a drive mechanism that can drive the rotating shaft to rotate. The drive mechanism includes a cylinder and a connecting rod. The driving end of the cylinder is hinged to the first end of the connecting rod, and the second end is fixedly connected to the rotating shaft.

[0026] When the drive mechanism is in the activated state, the flap switches to the open state, guiding the paper to slide down. When the drive mechanism is in the reset state, the flap returns to the closed state, and the paper continues to be conveyed along the transmission belt.

[0027] To ensure accurate matching between the sorting action and the detection result, and to avoid sorting errors caused by image processing time, preferably, a delay transmission belt is provided between the image acquisition device and the classification execution device, and the length of the delay transmission belt is L, satisfying: L≥v×t;

[0028] Where v is the paper conveying speed and t is the maximum time required for the image processing device to complete the image analysis of a single sheet of paper;

[0029] The operating speed of the delay conveyor belt is synchronized with that of the upstream conveyor belt, which provides the lag time required for image processing during paper feeding, ensuring accurate matching between sorting actions and detection results.

[0030] To facilitate the storage and sorting of genuine paper and improve the utilization rate of storage space, preferably, the genuine paper receiving compartment is located at the end of the sorting execution device, and a stacking platform is connected upstream of it.

[0031] The stacking platform includes a horizontally arranged stacked conveyor belt, the height of which is lower than the height of its upstream conveyor belt, and the conveying speed is lower than the conveying speed of the upstream conveyor belt.

[0032] By combining the height difference and the speed difference, the paper can be partially stacked on the stacking conveyor belt and transported to the product receiving bin in a stacked state.

[0033] In order to automatically adjust the storage space of the receiving bins and avoid affecting the normal operation of the inspection machine due to excessive paper accumulation, preferably, the positive product receiving bin, the waste receiving bin and the grading receiving bin all include a liftable base plate. The base plate is driven by a chain lifting mechanism and can adjust the height of the base plate from the ground in real time according to the height of paper accumulation in the bin.

[0034] The chain lifting mechanism includes a chain, a sprocket, a drive motor, and a guide column. One end of the chain is fixedly connected to the base plate, and the other end is wound around the sprocket. The sprocket is controlled to rotate by the drive motor. The guide column is vertically mounted on the frame, and the base plate is provided with a guide hole that guides and cooperates with the guide column.

[0035] When the paper in the storage compartment accumulates to a preset height, the drive motor starts, and the bottom plate is lowered by moving the drive chain downwards to maintain the effective storage space of the storage compartment.

[0036] In order to classify and process paper of different defect levels more precisely and meet different production needs, preferably, the graded receiving bins are configured as two, corresponding to the preset first defect level and the second defect level respectively.

[0037] The sorting mechanism includes two sets of flaps and inclined guide plates corresponding to the two graded receiving bins, which are used to guide defective papers of different grades to the corresponding graded receiving bins.

[0038] Compared with existing technologies, the advantages of this invention are as follows: Through the dual-view layout of the image acquisition device, utilizing the first camera above the lower suction platform and the second camera below the upper suction platform, combined with negative pressure adsorption technology, images of both sides of the paper are acquired, completely eliminating the blind spot of missed defects on the back side in traditional single-sided inspection, and comprehensively covering the quality inspection of key patterns on both sides of playing card paper. Simultaneously, the image processing device is equipped with configurable multi-level defect judgment rules, breaking through the simple classification mode of traditional equipment that distinguishes between qualified and unqualified. Multi-level defect levels can be customized according to production needs. Combined with the sorting mechanism and dynamic guide path design of the classification execution device, different categories of paper are accurately sorted into corresponding storage bins. Paper with secondary utilization value, despite size differences, is accurately sorted into the graded storage bin, and subsequently cut and adapted using matching blades for secondary utilization. This effectively improves paper utilization and reduces production costs, thereby achieving an upgrade in quality control from comprehensive inspection to precise grading throughout the entire process. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0040] Figure 2 This is a cross-sectional structural diagram of this embodiment;

[0041] Figure 3 for Figure 2 Enlarged schematic diagram of part A;

[0042] Figure 4 This is a three-dimensional structural diagram of the correction mechanism in this embodiment;

[0043] Figure 5 This is a three-dimensional structural diagram of the image acquisition device in this embodiment;

[0044] Figure 6 for Figure 2 Enlarged schematic diagram of section B structure;

[0045] Figure 7 This is a schematic diagram of the drive mechanism in this embodiment. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] like Figures 1-7 The diagram shows the preferred embodiment of this utility model. The playing card inspection machine in this embodiment mainly includes a frame 1, an input device 2, a correction mechanism 3, an image acquisition device 4, an image processing device 5, and a classification execution device 6, among other core components. Through a reasonable layout and connection, these components achieve automated inspection and classification of uncut paper. The specific structure, working principle, and connection methods of each component will be described in detail below.

[0048] Input device 2: Reference Figure 2 and Figure 3 As shown, the main function of input device 2 is to separate uncut sheets of paper stacked in a stacked state one by one and transport them downstream. It includes a suction cup 2a capable of adsorbing paper. The suction cup 2a is connected to an external negative pressure air source via an air pipe, which can be a vacuum pump or similar device. When the vacuum pump is activated, the generated negative pressure is transmitted to the suction cup 2a through the air pipe, enabling it to adsorb paper. The suction cup 2a is mounted on a movable robotic arm, which can be driven by a motor or other transmission mechanism and can move along a preset trajectory to achieve the adsorption and transport of paper. In specific operation, the robotic arm lowers the suction cup 2a to the top layer of the stacked paper, the negative pressure air source causes the suction cup 2a to adsorb the paper, and then the robotic arm rises and moves the paper to the downstream correction mechanism 3.

[0049] Corrective agency 3: Reference Figure 1 and Figure 4 As shown, the correction mechanism 3 is closely connected to the input device 2 and is used to correct the positional deviation of the paper during the conveying process. It mainly includes an inclined conveyor belt 3a, a reference plate 3b, and a limiting template 3c.

[0050] The inclined conveyor belt 3a is arranged in the horizontal plane at a preset inclination angle toward the reference plate 3b. It can be supported by a drive roller and a driven roller. The drive roller is connected to the output shaft of the motor through a coupling. The motor drives the drive roller to rotate, thereby driving the conveyor belt. The upper surface of the inclined conveyor belt 3a is flat, which can transport paper smoothly.

[0051] The reference plate 3b is fixedly installed on the frame 1, located on the side of the inclined conveyor belt 3a, to provide a positioning reference for the paper.

[0052] The limiting template 3c is mounted above the inclined conveyor belt 3a via a bracket, forming a limiting gap between it and the inclined conveyor belt 3a that allows only a single sheet of paper to pass through. When paper is fed from the input device 2 onto the inclined conveyor belt 3a, due to the inclined arrangement of the conveyor belt, the paper is subjected to a component force in the direction of the reference plate 3b during the conveying process, gradually adhering to the reference plate 3b. At the same time, the limiting template 3c restricts the height of the paper, ensuring that the paper passes through in the correct posture, completing position correction and preventing paper overlap.

[0053] Image acquisition device 4: Reference Figure 1 and Figure 5 As shown, the image acquisition device 4 is used to acquire images of both sides of the paper, providing data for subsequent defect analysis. It includes a lower suction platform 4a, an upper suction platform 4b, a first camera 4c, and a second camera 4d.

[0054] The suction platform 4a includes a suction drive belt 4a1, which is arranged along the paper conveying direction and supported by a drive roller and a driven roller. The drive roller is connected to a motor via a coupling to realize the operation of the suction drive belt. Multiple suction holes 4a2, penetrating along the thickness direction, are evenly distributed on the suction drive belt 4a1. A negative pressure suction device 4a3 is installed below the suction drive belt 4a1 and communicates with the suction holes 4a2 through channels. The negative pressure suction device 4a3 can be a centrifugal fan. When the fan starts, a negative pressure is formed in the pipe, which adsorbs the back of the paper onto the upper surface of the suction drive belt 4a1 through the suction holes 4a2. A first camera 4c is installed above the suction platform 4a and fixed to the frame 1 by a bracket. The lens of the first camera 4c is aimed at the paper on the suction drive belt 4a1 to capture an image of the front of the paper.

[0055] The upper suction platform 4b includes an upper suction drive belt 4b1, which is arranged along the paper conveying direction and has a similar structure to the lower suction drive belt 4a1, also driven by a drive roller, a driven roller, and a motor. The upper suction drive belt 4b1 has multiple upper suction adsorption holes 4b2 extending along the thickness direction. A negative pressure upper suction device 4b3 is installed above the upper suction drive belt 4b1 and communicates with the upper suction adsorption holes 4b2 through channels. When the fan is started, the front side of the paper is adsorbed onto the lower surface of the upper suction drive belt 4b1 through the upper suction adsorption holes 4b2. A second camera 4d is installed below the upper suction platform 4b and fixed to the frame 1 by a bracket. The lens is aimed at the paper on the upper suction drive belt 4b1 to capture images of the reverse side of the paper.

[0056] When the paper passes through the lower suction platform 4a, the negative pressure lower suction device 4a3 causes the back of the paper to be adsorbed onto the lower suction conveyor belt 4a1, and the first camera 4c captures the front image; when the paper enters the upper suction platform 4b, the negative pressure upper suction device 4b3 causes the front of the paper to be adsorbed onto the upper suction conveyor belt 4b1, and the second camera 4d captures the back image. Here, the lower suction platform 4a is located downstream of the upper suction platform 4b and is set adjacent to it.

[0057] Image processing device 5: The image processing device 5 is connected to the first camera 4c and the second camera 4d in the image acquisition device 4 via a data cable to receive the acquired images of both sides of the paper. This image processing device 5 can be an industrial computer (not shown in the attached diagram). It has built-in specialized image processing software and a multi-level defect judgment rule algorithm. Upon receiving the image, the image processing device 5 analyzes and processes the image, identifies the types of defects on the paper such as pattern misalignment, color deviation, ink stains, and missing prints, and determines the defect level according to the preset multi-level defect judgment rules. The processing result is transmitted to the classification execution device 6 via a signal line.

[0058] Classification execution device 6: Reference Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the classification execution device 6 is connected downstream of the image acquisition device 4, and mainly includes a positive product receiving bin 6a, a waste receiving bin 6b, a grading receiving bin 6c, and a sorting mechanism 6d. The positive product receiving bin 6a, the waste receiving bin 6b, and the grading receiving bin 6c are all mounted on the frame 1, located below the corresponding interval 6e. In this embodiment, two grading receiving bins 6c are configured, corresponding to the preset first defect level and the second defect level, respectively.

[0059] The sorting mechanism 6d here includes a flap 6d1, an inclined guide plate 6d2, and a drive mechanism 6d5. The flap 6d1 is installed in the interval 6e formed between two adjacent transmission belt groups. The cross-section of the flap 6d1 is V-shaped, and a rotating shaft 6d4 perpendicular to the paper transmission direction is provided on it. The rotating shaft 6d4 is mounted on the frame 1 by bearings to ensure its flexible rotation. The inclined guide plate 6d2 is connected between the interval 6e and the corresponding receiving bin, and its inclination angle is adapted to the misalignment distance of the corresponding receiving bin. An auxiliary conveyor belt 6d3 is configured on the surface of the inclined guide plate 6d2. The auxiliary conveyor belt 6d3 is supported by a drive roller and a driven roller. The drive roller is connected to a motor through a coupling to realize the operation of the conveyor belt. The drive mechanism 6d5 includes a cylinder 6d6 and a connecting rod 6d7. The cylinder body of the cylinder 6d6 is fixed to the frame 1 by bolts. Its driving end is hinged to the first end of the connecting rod 6d7, and the second end of the connecting rod 6d7 is fixedly connected to the rotating shaft 6d4. When the image processing device 5 transmits the defect level signal to the sorting mechanism 6d, if paper sorting is required, the corresponding cylinder 6d6 is activated, which drives the rotating shaft 6d4 to rotate via the connecting rod 6d7, causing the flap 6d1 to switch to the open state. The paper is removed from the conveyor belt at interval 6e and, with the assistance of the auxiliary conveyor belt 6d3 on the inclined guide plate 6d2, slides into the corresponding waste collection bin 6b or grading collection bin 6c. If the paper has no defects or the defect level does not trigger the sorting mechanism 6d, the flap 6d1 is in the closed state, and the paper continues to be conveyed along the extension direction of the conveyor belt, entering the good product collection bin 6a through the default path.

[0060] In this embodiment, the positive product storage bin 6a, the waste storage bin 6b, and the graded storage bin 6c are all equipped with a liftable base plate 8. The liftable base plate 8 is driven by a chain lifting mechanism 8a, which includes a chain 8a1, a sprocket 8a2, a drive motor 8a3, and a guide post 8a4. One end of the chain 8a1 is fixedly connected to the base plate 8, and the other end is wound around the sprocket 8a2. The sprocket 8a2 is connected to the output shaft of the drive motor 8a3 via a coupling, and the drive motor 8a3 is fixed to the frame 1. The guide post 8a4 is vertically mounted on the frame 1, and the base plate 8 has a guide hole 8a5 that guides and cooperates with the guide post 8a4. When the paper in the storage bins accumulates to a preset height, the drive motor 8a3 starts, driving the sprocket 8a2 to rotate, and the base plate 8 is lowered through the chain 8a1 to maintain the effective storage space of the storage bins.

[0061] In this embodiment, reference Figure 1 and Figure 3As shown, a delay conveyor belt 7 and a stacking table 9 are also provided. The delay conveyor belt 7 is installed between the image acquisition device 4 and the sorting execution device 6, and its length L satisfies L≥v×t, where v is the paper conveying speed and t is the maximum time required for the image processing device 5 to complete the image analysis of a single sheet of paper. The delay conveyor belt 7 is driven by an active roller, a driven roller, and a motor, and its running speed is synchronized with the upstream conveyor belt. It is used to provide the lag time required for image processing during paper conveying, ensuring accurate matching between sorting actions and detection results.

[0062] The stacking table 9 is located upstream of the product receiving chamber 6a and includes a horizontally arranged stacking conveyor belt 9a. The stacking conveyor belt 9a is driven by a drive roller, a driven roller, and a motor. Its height is lower than that of its upstream conveyor belt, and its conveying speed is lower than that of the upstream conveyor belt. When paper is conveyed from the upstream conveyor belt to the stacking conveyor belt 9a, due to the height and speed differences, the paper forms partial stacks on the stacking conveyor belt 9a, and is then conveyed to the product receiving chamber 6a in a stacked state.

[0063] Of course, we can also install some pressure strips or rollers on the transmission belt as needed to hold down the moving paper and prevent it from curling up or shifting.

[0064] The working principle of this embodiment is explained in detail below:

[0065] 1. Paper Separation and Posture Correction: The suction cup 2a of the input device uses negative pressure to adsorb the top layer of stacked paper, and the robotic arm moves to separate individual sheets, avoiding the wear and jamming of traditional paper feeding. The separated paper is fed into the correction mechanism 3 by a conveyor belt: the inclined conveyor belt 3a guides the paper to the reference plate 3b at a specific angle, and uses the component of gravity to make it automatically adhere; the gap between the limiting template 3c and the conveyor belt forces the individual sheets to pass through and corrects the flatness, ensuring that the paper enters the detection stage with a zero-offset posture.

[0066] 2. Simultaneous acquisition of images from both sides: When the paper passes through the lower suction platform 4a, the negative pressure lower suction device 4a3 generates suction through the suction hole 4a2, fixing the reverse side of the paper to the conveyor belt, while the front side is fully exposed. The upper camera 4c acquires the front image at high resolution. The paper continues to the front and enters the upper suction platform 4b. The negative pressure upper suction device 4b3 adsorbs the front side of the paper, while the reverse side is fully exposed. The lower camera 4d acquires the reverse image of the paper. The dual-camera setup ensures blind-spot-free detection of the paper.

[0067] 3. Defect Grading and Dynamic Sorting Execution: The industrial computer 5, based on deep learning algorithms, quickly performs image analysis, identifies defects such as pattern misalignment and color difference, and can grade papers with size differences (e.g., preset "line 1" and "line 2"). Defect-free papers enter the stacking table 9 along the default path and are automatically stacked based on speed and height differences; defective papers trigger the corresponding flip plate 6d1, which rotates under the drive of cylinder 6d6 to open the transmission belt interval 6e. The paper is accelerated and slides down the auxiliary conveyor belt 6d3 of the inclined guide plate 6d2 to the grading container 6c or the waste container 6b, with rapid and accurate sorting response. Especially for those papers with size differences but still have secondary use value, they will be accurately sorted to the grading container. The grading container 6c is specifically used to store this type of paper, which can be subsequently cut and adapted using matching cutters for secondary use. For other severely defective papers, they will be directly sorted to the waste container.

[0068] 4. Time Synchronization and Intelligent Storage System: The length of the delayed conveyor belt 7 is designed according to the image processing time, ensuring that the processing results are output when the paper arrives at the sorting position, avoiding erroneous actions. The chain lifting mechanism 8a at the bottom of the storage bin automatically adjusts the base plate 8 according to the paper stacking height. When the bin reaches the preset height, the drive motor 8a3 controls the base plate to descend, maintaining effective storage space and reducing manual intervention.

[0069] The core technical logic of this embodiment is as follows: comprehensive detection is achieved through "dual negative pressure adsorption fixation + dual camera synchronous acquisition", accurate defect classification is achieved by relying on "multi-level algorithm grading + pneumatic flip-plate sorting", and efficiency of the whole process is ensured by "delay matching + automatic lifting and storage". It breaks through the limitations of traditional single-sided detection and rough sorting, and constructs a closed-loop system of "full-dimensional detection - intelligent grading - automated execution", which significantly improves the quality control accuracy and resource utilization of playing card production.

[0070] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are merely 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. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A playing card inspection machine, comprising a frame (1), characterized in that: Also includes The input device (2) includes a suction cup (2a) that can adsorb paper. The suction cup (2a) adsorbs and moves the uncut paper in a stacked state one by one and outputs the paper downstream. The correction mechanism (3) is connected to the input device (2) and receives the separated paper, and corrects the placement of the paper in real time during the conveying process to prevent deviation. The image acquisition device (4) includes a lower suction platform (4a) and an upper suction platform (4b). A first camera (4c) is provided above the lower suction platform (4a) to acquire the front image of the paper, and a second camera (4d) is provided below the upper suction platform (4b) to acquire the back image of the paper. The image processing device (5) is connected to the image acquisition device (4) and is used to receive images of both sides of the paper, and to perform synchronous analysis according to the preset multi-level defect judgment rules to identify the defect type and determine its level. The sorting execution device (6) is connected downstream of the image acquisition device (4) and includes a good product holding bin (6a), a waste disposal bin (6b) and at least one graded holding bin (6c), as well as sorting mechanisms (6d) corresponding to the waste disposal bin (6b) and the graded holding bin (6c). Each sorting mechanism (6d) is signal connected to the image processing device (5) and dynamically guides the paper to the corresponding waste disposal bin (6b) or graded holding bin (6c) according to the identified defect level. The correction mechanism (3), the lower suction platform (4a), the upper suction platform (4b) and the sorting execution device (6) form a continuous conveying path through the transmission belts arranged on the frame (1) and connected to each other, so as to ensure that the paper can be transferred sequentially between the modules. When the sorting mechanism (6d) is not triggered, the paper enters the good product receiving chamber (6a) along the default path.

2. The playing card inspection machine according to claim 1, characterized in that: The correction mechanism (3) includes a horizontally conveying inclined conveyor belt (3a), a reference plate (3b) located on the side of the inclined conveyor belt (3a), and a limiting template (3c) located above the inclined conveyor belt (3a). The inclined conveyor belt (3a) is arranged in the horizontal plane at a preset inclination angle toward the reference plate (3b), so that the paper gradually adheres to the reference plate (3b) under the action of the conveying direction component force during the horizontal conveying process; The limiting template (3c) and the inclined conveyor belt (3a) form a limiting gap that allows only a single sheet of paper to pass through. When the paper passes through the limiting gap, its edge is in complete contact with the reference plate (3b) to complete the position correction, while ensuring that the paper is always in a single-sheet separated state.

3. The playing card inspection machine according to claim 1, characterized in that: The lower suction platform (4a) includes a lower suction conveyor belt (4a1) arranged along the paper conveying direction. The lower suction conveyor belt (4a1) is provided with a plurality of lower suction adsorption holes (4a2) that penetrate along the thickness direction. At least one negative pressure lower suction device (4a3) is also provided below the lower suction conveyor belt (4a1). The air inlet end of the negative pressure lower suction device (4a3) is connected to the lower suction adsorption holes (4a2). When the downward suction conveyor belt (4a1) is in operation, the negative pressure downward suction device (4a3) generates negative pressure suction force through the downward suction adsorption hole (4a2), fixing the back of the paper to the upper surface of the downward suction conveyor belt (4a1), while simultaneously exposing the front of the paper completely so that the first camera (4c) located above can capture an image of the front of the paper.

4. The playing card inspection machine according to claim 1, characterized in that: The upper suction platform (4b) includes an upper suction conveyor belt (4b1) arranged along the paper conveying direction. The upper suction conveyor belt (4b1) is provided with a plurality of upper suction adsorption holes (4b2) that penetrate along the thickness direction. At least one negative pressure upper suction device (4b3) is also provided above the upper suction conveyor belt (4b1). The air inlet end of the negative pressure upper suction device (4b3) is connected to the upper suction adsorption holes (4b2). When the upper suction conveyor belt (4b1) is in operation, the negative pressure upper suction device (4b3) generates negative pressure suction force through the upper suction adsorption hole (4b2), fixing the front of the paper to the lower surface of the upper suction conveyor belt (4b1), while completely exposing the back of the paper so that the second camera (4d) located below can capture the image of the back of the paper.

5. The playing card inspection machine according to claim 1, characterized in that: Downstream of the image acquisition device (4), multiple sets of horizontally arranged transmission belts are sequentially arranged along the paper conveying direction, with a gap (6e) formed between adjacent two transmission belt sets. The sorting mechanism (6d) includes a flap (6d1) and an inclined guide plate (6d2). The waste collection bin (6b) and the grading collection bin (6c) are both located below the corresponding interval (6e) and are connected to the interval (6e) through the inclined guide plate (6d2). The inclination angle of the inclined guide plate (6d2) is adapted to the misalignment distance of the corresponding collection bin. Each interval (6e) is provided with a flap (6d1), and the flipping axis of the flap (6d1) is parallel to the width direction of the transmission belt; When the flap (6d1) is open, the paper leaves the conveyor belt group at the interval (6e) and slides into the corresponding waste collection bin (6b) or grading bin (6c) via the inclined guide plate (6d2). When the flap (6d1) is closed, the paper continues to be conveyed along the extension direction of the conveyor belt group and enters the good product collection bin (6a) through the default path.

6. The playing card inspection machine according to claim 5, characterized in that: An auxiliary conveyor belt (6d3) is disposed on the surface of the inclined guide plate (6d2). The running direction of the auxiliary conveyor belt (6d3) is consistent with the inclination direction of the inclined guide plate (6d2), and it is used to assist the paper to slide smoothly into the corresponding receiving bin along the inclined guide plate (6d2).

7. The playing card inspection machine according to claim 5, characterized in that: The flip plate (6d1) has a V-shaped cross-section. The flip plate (6d1) is provided with a rotating shaft (6d4) perpendicular to the paper transmission direction. The rotating shaft (6d4) is connected to a driving mechanism (6d5) that can drive the rotating shaft (6d4) to rotate. The driving mechanism (6d5) includes a cylinder (6d6) and a connecting rod (6d7). The driving end of the cylinder (6d6) is hinged to the first end of the connecting rod (6d7), and the second end is fixedly connected to the rotating shaft (6d4). When the drive mechanism (6d5) is in the activated state, the flap (6d1) switches to the open state, guiding the paper to slide down. When the drive mechanism (6d5) is in the reset state, the flap (6d1) returns to the closed state, and the paper continues to be conveyed along the transmission belt.

8. The playing card inspection machine according to claim 1, characterized in that: A time-delay transmission belt (7) is provided between the image acquisition device (4) and the classification execution device (6), and the length of the time-delay transmission belt (7) is L, satisfying: L≥v×t; Where v is the paper conveying speed and t is the maximum time required for the image processing device (5) to complete the image analysis of a single sheet of paper; The running speed of the delay conveyor belt (7) is synchronized with that of the upstream conveyor belt, which is used to provide the lag time required for image processing during paper conveying, so as to ensure that the sorting action and the detection result are accurately matched.

9. The playing card inspection machine according to claim 1, characterized in that: The genuine product receiving compartment (6a) is located at the end of the sorting execution device (6), and a stacking platform (9) is connected upstream of it; The stacking platform (9) includes a horizontally arranged stacked transmission belt (9a), the height of which is lower than the height of its upstream transmission belt, and the conveying speed is lower than the conveying speed of the upstream transmission belt. By combining the height difference and the speed difference, the paper can be partially stacked on the stacking conveyor belt (9a) and transported to the product receiving bin (6a) in a stacked state.

10. The playing card inspection machine according to any one of claims 1 to 9, characterized in that: The genuine product storage compartment (6a), the waste storage compartment (6b), and the graded storage compartment (6c) all include a liftable base plate (8). The base plate (8) is driven by a chain lifting mechanism (8a) and can adjust the height of the base plate (8) from the ground in real time according to the height of the paper stack in the compartment. The chain lifting mechanism (8a) includes a chain (8a1), a sprocket (8a2), ​​a drive motor (8a3), and a guide post (8a4). One end of the chain (8a1) is fixedly connected to the base plate (8), and the other end is wound around the sprocket (8a2). The sprocket (8a2) is controlled to rotate by the drive motor (8a3). The guide post (8a4) is vertically mounted on the frame (1), and the base plate (8) is provided with a guide hole (8a5) that guides and cooperates with the guide post (8a4).

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