A multi-stage impurity removing device for leaf threshing and redrying production line

Abstract

The utility model belongs to the threshing and redrying equipment technical field, concretely relates to a kind of multistage impurity removing device for threshing and redrying production line, including conveying belt unit, multistage industrial camera being set apart along the direction of conveying, corresponding spray blowing removing mechanism and control module.Conveying belt unit sets material narrow section or branch flow path, so that raw material is gradually concentrated in the conveying process, and the impurity recognition rate is improved;Industrial camera collects material image, and control module accurately controls spray blowing mechanism action according to image information and preset delay strategy, and separates impurities from material.Guiding vane and baffle are used to guide material flow and limit the range of wind action, reducing raw material loss.The utility model can improve the removing efficiency, reduce raw material loss, improve the automation level and operation reliability of production line, and is suitable for automatic removal of light impurities in threshing and redrying production line.

Description

Technical Field

[0001] This utility model belongs to the field of leaf re-drying production technology, specifically relating to a multi-stage impurity removal device for a leaf re-drying production line. Background Technology

[0002] Leaf threshing and re-drying is the initial stage of cigarette production, and its quality directly affects the taste and appearance of the finished cigarettes. During the threshing and re-drying process, various lightweight impurities often mix into the raw materials, such as animal hair, feathers, plastic fibers, shredded paper, and fruit peels and pits. These impurities not only affect the quality of the cigarettes but may also damage subsequent processing equipment. Therefore, an impurity removal process must be included in the production line.

[0003] Currently, a commonly used method for removing lightweight debris involves deploying CCD cameras on the conveyor belt for image acquisition and recognition, combined with a suction device for removal. While CCD cameras identify debris based on color, shape, and texture, this method has significant limitations in practical applications. The raw materials for leaf re-drying are spread widely across the conveyor belt, and debris can be scattered throughout the entire transport area, while the imaging range of a single CCD is limited. To cover the main transport area and maintain cost-effectiveness, CCDs are typically installed only in the middle or a localized area of ​​the belt. This makes it easy for debris at the edges or corners of the belt to fall into blind spots and remain undetected. Furthermore, the large size, high cost, strict requirements for lighting conditions, and complex maintenance of CCDs limit the simultaneous deployment of multiple CCDs, further reducing overall detection efficiency and coverage.

[0004] In actual removal processes, after the CCD detects debris, a timing trigger needs to be established based on the belt speed and the fixed distance between the camera and the suction device. However, due to fluctuations in the production line cycle time, localized belt slippage, or changes in material accumulation, the suction device's operation can easily misalign with the actual location of the debris, potentially resulting in some debris not being removed in time. Furthermore, to ensure effective suction, a higher negative pressure is usually required during debris removal, which may draw away a large amount of surrounding raw material, causing interference, or draw away too much tobacco, resulting in the loss of qualified raw materials. Conversely, if only an appropriate negative pressure is used, the suction force is difficult to control precisely, potentially leading to missed debris.

[0005] Finally, the existing system suffers from insufficient automation and reliability. Limited by the aforementioned issues of positioning accuracy and execution efficiency, materials rejected by the CCD identification and suction device still require manual final inspection and sorting. This not only significantly increases labor costs but also limits overall production efficiency to manual speed, becoming a bottleneck for improving the automation level of the production line.

[0006] To address the above problems, this utility model is proposed. Utility Model Content

[0007] To address the problems of limited coverage, low identification accuracy, inaccurate rejection timing, easy raw material loss, and insufficient automation in existing leaf re-drying production lines, this invention provides a multi-stage rejection device. This device, by incorporating multi-stage image acquisition modules on the conveyor belt and combining material flow narrowing and branching flow path design, gradually concentrates the raw material during transport, creating favorable conditions for accurate identification and thus improving the rejection rate and coverage. The system further links with the blowing mechanism through a control module, precisely controlling the rejection action based on acquired image information and preset delay strategies, effectively reducing missed and incorrect rejections. Simultaneously, the guide plate 5 guides material flow, reducing stagnation and overflow, while the blowing window limits the airflow range, ensuring effective rejection of impurities while minimizing the loss of qualified raw materials. In summary, this invention significantly improves rejection efficiency, production line automation level, and operational reliability.

[0008] The technical solution adopted in this utility model is:

[0009] A multi-stage rejection device for a leaf re-drying production line is provided, comprising:

[0010] Conveyor belt unit 1 is used to transport and gradually narrow the width of the spread material for leaf re-drying;

[0011] The image acquisition module includes a plurality of cameras 2 spaced apart along the conveying direction of the conveyor belt unit 1, used to acquire images of materials on the conveyor belt in a graded manner; the blow-off rejection module includes a plurality of blow-off mechanisms 3 corresponding to the number of cameras 2, each blow-off mechanism 3 being located at a downstream station of the corresponding camera 2; the control module is electrically connected to the image acquisition module and the blow-off rejection module respectively, used to receive image information acquired by the cameras 2 and perform impurity identification, and control the corresponding blow-off mechanism 3 to operate according to the identification results and a preset delay strategy.

[0012] Preferably, the conveyor belt unit 1 is provided with a material flow narrowing section, the width of which gradually decreases along the conveying direction, so that the material is gradually concentrated during the transmission process, so that each cleaning station can carry out cleaning in sequence.

[0013] Preferably, the conveyor belt unit 1 is provided with at least two branch flow paths 1a formed by the upstream main conveying section 1b. The conveying width of the branch flow path 1a is smaller than the width of the main conveying section 1b, so as to achieve material concentration and coordinated removal of impurities.

[0014] Preferably, the width of the branch flow path 1a remains constant, or decreases gradually along the conveying direction.

[0015] Preferably, the narrowing section of the material flow is composed of several conveyor belts 11 that are connected end to end and whose width gradually decreases along the conveying direction.

[0016] Preferably, the branch flow path 1a guides the raw material to multiple downstream parallel conveyor belts 11 through the guide plate 4 set at the outlet of the upstream main conveyor belt 1b, and the conveying width of each downstream conveyor belt 11 is smaller than the conveying width of the upstream main conveyor belt 1b.

[0017] Preferably, a guide plate 5 is provided at the junction of two adjacent conveyor belts 11. The guide plate 5 has a slope along the conveying direction and narrows towards the center of the downstream belt on both sides in the transverse direction, so as to smoothly guide the material from the upstream belt to the downstream belt and reduce material retention.

[0018] Preferably, baffles are provided on both sides of the conveying area and the diversion area formed by the guide plate 5 or the guide plate 4 of the conveyor belt unit 1. The baffles are provided with windows at the corresponding positions of each blowing mechanism 3 to allow the blowing airflow to pass through, and are provided with impurity discharge outlets at the relative positions of the blowing airflow direction to allow the rejected impurities to be discharged to the external receiving mechanism.

[0019] Preferably, each of the blowing mechanisms 3 includes a ventilation pipe connected to an external air supply device and a nozzle communicating with the ventilation pipe, the blowing direction of the nozzle being along the belt surface of the conveyor belt 11.

[0020] The aforementioned control module includes a processing unit connected to the camera 2 and the blowing mechanism 5. The processing unit has preset delay trigger parameters, which are used to achieve rejection control that matches the running speed and spacing of the conveyor belt 11 when the nozzle is in motion.

[0021] Preferably, a small gap is reserved between the guide plate 4 or the guide vane 5 and the conveyor belt on the side opposite to the conveyor belt to ensure smooth circulation of the conveyor belt; a flexible seal is fixedly connected to this edge, the flexible seal extending into the gap and conforming to the surface of the conveyor belt to prevent material from leaking out of the gap. The flexible seal can be made of wear-resistant rubber sheet or polyurethane strip. This structure ensures a smooth transition of material to the next stage of the belt while avoiding material loss.

[0022] The beneficial effects of this utility model are:

[0023] First, this invention significantly improves identification and rejection performance. Through the synergistic effect of material flow narrowing, branching and guiding, and multi-level industrial camera (replacing traditional CCD cameras) image acquisition modules, multi-point, multi-station detection of the material flow is achieved, significantly improving the identification rate and rejection coverage of lightweight debris, effectively solving the problems of limited coverage and low identification accuracy of traditional single-point detection. The multi-level rejection design allows for detection and rejection of raw materials at each conveyor belt level. Debris that may be missed in the previous level can be supplemented and rejected in the next level, thereby reducing the missed rejection rate and improving the thoroughness of rejection. Compared to traditional CCDs, industrial cameras are smaller, lower in cost, and more adaptable to different lighting conditions, facilitating full material surface coverage in multi-level arrangements and reducing system maintenance burden.

[0024] Secondly, the rejection accuracy is high, and the material loss is minimal. The control module precisely controls the blowing mechanism based on image information and preset delay strategies, achieving controllable rejection timing and reducing missed and incorrect rejections. Simultaneously, the guide plate 5 guides material flow, reducing stagnation and overflow, and the blowing window limits the range of airflow, ensuring that the rejection action primarily targets the impurities, minimizing the loss of qualified raw materials while maintaining rejection efficiency.

[0025] Furthermore, in existing technologies, conveyor belts are typically arranged in a single-width continuous manner, resulting in a dispersed material flow across the entire belt and a lack of effective concentrating measures. Simultaneously, existing rejection systems generally operate in a single channel, and even with multiple cameras, full material coverage cannot be achieved through diversion. In contrast, this application diverts material to two or more downstream branch paths via the upstream main conveyor section, combined with a progressively narrowing design, concentrating the material across both width and flow path. This combination not only improves the detection and rejection efficiency of each flow path but also allows for the supplementary rejection of previously missed debris in downstream branch paths, thereby significantly improving overall rejection coverage and accuracy.

[0026] Finally, this invention comprehensively improves the level of automation and system reliability. The device achieves fully automated closed-loop control from identification and analysis to execution, significantly reducing the need for manual intervention. The multi-level, independent workstation design enhances the system's fault tolerance and stability, ensuring continuous and efficient operation of the production line, while providing reliable support for the intelligent upgrade of leaf re-drying production. The flexible arrangement of industrial cameras also facilitates future system expansion or upgrades. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the layout of the first type of impurity removal device of this utility model in Embodiment 1;

[0029] Figure 2 This is a schematic diagram of the layout of the second type of impurity removal device of this utility model in Embodiment 2;

[0030] Reference numerals: 1. Conveyor belt unit; 11. Conveyor belt; 2. Camera; 3. Spraying mechanism; 1b. Main conveyor section; 1a. Branch flow path; 4. Guide plate; 5. Flow deflector. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to embodiments, but this is not intended to limit the present invention. Any modifications or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the field or in accordance with the product manual.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment provides a multi-stage rejection device, characterized by using only a single main conveyor section without branch flow paths, and the conveyor belt unit gradually narrows along the conveying direction. The specific structure includes a conveyor belt unit 1, multi-stage industrial cameras 2 arranged at intervals along the conveying direction, a pulse-type jetting mechanism 3, and a control module.

[0034] The conveyor belt unit 1 consists of several belt segments connected end to end. The conveying width of each belt segment gradually decreases along the conveying direction, causing the material to gradually concentrate during the transmission process. The guide plate 5 is set at the junction of adjacent belt segments, with an appropriate slope along the conveying direction, and narrows laterally towards the center of the downstream belt, to smoothly guide the material from the upstream belt to the downstream belt and reduce stagnation.

[0035] Each blowing mechanism 3 corresponds to an industrial camera station 2. The control module triggers a pulsed, high-intensity blowing action based on image acquisition information and preset delay parameters. Each blow generates a high-intensity airflow that removes identified impurities from the material. Due to the multi-stage impurity removal design, impurities missed in the previous stage can be removed in the next, improving the thoroughness of removal. Baffles are installed on both sides of the belt and in the area of ​​the guide plate 5. Blowing windows are opened at each blowing station to precisely constrain the airflow range. Simultaneously, the blowing windows correspond to the impurity discharge windows, and impurities are discharged through the discharge outlets to an external receiving mechanism to minimize the loss of qualified raw materials.

[0036] The process of removing impurities using the device in this embodiment is as follows: The re-drying raw material enters the main conveyor section from upstream. As the conveyor belt gradually narrows, the material gradually concentrates. Each industrial camera 2 captures an image of the material on the current belt. The control module processes the image and identifies impurities, triggering the corresponding blowing mechanism 3 to perform a powerful pulse-type blowing action to remove impurities. The guide plate 5 and baffles ensure smooth material transport, and the blowing window precisely constrains the range of airflow, ensuring both removal efficiency and minimizing raw material loss.

[0037] Example 2

[0038] like Figure 2 As shown, this embodiment adds a branch flow path design based on embodiment 1 to further improve the rejection coverage and material concentration effect. The conveyor belt unit 1 consists of an upstream main conveying section 1b and two or more downstream branch flow paths 1a. The conveying width of the branch flow path 1a is smaller than that of the main conveying section 1b, and gradually narrows along the conveying direction. A guide plate 4 is provided at the outlet of the upstream main conveying section 1b to guide the material to the downstream branch conveyor belt 11.

[0039] Each belt conveyor 11 in branch flow path 1a still adopts a multi-stage gradually narrowing design, with guide plates 5 installed at the junction of adjacent belt sections to ensure smooth material flow and reduce stagnation. Each branch belt section is equipped with an industrial camera 2 and a pulse jet blowing mechanism 3, which are independently controlled by the corresponding control module. Baffles and blowing windows are installed on both sides of the branch flow path and in the area of ​​the guide plate 5, and debris is discharged to the receiving mechanism through the discharge outlet.

[0040] The process of removing impurities using the device in this embodiment is as follows: The raw material for leaf re-drying enters from the upstream main conveyor section and is diverted to the downstream branch flow path 1a by the guide plate 4, further concentrating the material in width. The industrial camera 2 on each branch conveyor belt 11 captures real-time images of the material. The control module identifies impurities and triggers the corresponding blowing mechanism 3 to perform pulsed, high-intensity blowing. Each blow generates a high-intensity airflow that removes impurities. The multi-stage branch impurity removal design ensures that each flow path is fully inspected, and supplementary blowing from upstream and downstream stages improves the removal coverage. The guide plate 5 and blowing window are rationally arranged to ensure smooth material flow and precise airflow, guaranteeing effective removal of impurities while minimizing raw material loss.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this application; the dimensions described in the drawings and embodiments are not related to the specific physical object and are not used to limit the protection scope of this application. The physical dimensions can be selected and changed according to actual needs.

Claims

1. A multi-stage impurity removal device for a leaf re-drying production line, characterized in that, include: Conveyor belt unit (1) is used to convey and gradually narrow the width of the spread material for leaf re-drying; The image acquisition module includes a plurality of cameras (2) spaced apart along the conveying direction of the conveyor belt unit (1) for graded acquisition of images of materials on the conveyor belt; the blow-off removal module includes a plurality of blow-off mechanisms (3) corresponding to the number of cameras (2), each blow-off mechanism being located at a downstream station of the corresponding camera (2); the control module is electrically connected to the image acquisition module and the blow-off removal module respectively, for receiving image information acquired by the cameras (2) and performing impurity identification, and controlling the action of the corresponding blow-off mechanism according to the identification result and a preset delay strategy.

2. The multi-stage impurity removal device for a leaf re-drying production line according to claim 1, characterized in that, The conveyor belt unit (1) is equipped with a material flow narrowing section. The width of the narrowing section gradually decreases along the conveying direction, so that the material is gradually concentrated during the transmission process, so that each cleaning station can clean up the material in turn.

3. The multi-stage rejection device according to claim 1, characterized in that, The conveyor belt unit (1) is provided with at least two branch flow paths (1a) formed by the diversion of the upstream main conveying section (1b). The conveying width of the branch flow path is smaller than the width of the main conveying section (1b) so as to achieve material concentration and cooperate in the removal of impurities.

4. The multi-stage rejection device according to claim 3, characterized in that, The width of the branch flow path (1a) remains constant, or decreases gradually along the conveying direction.

5. The multi-stage rejection device according to claim 2, characterized in that, The narrowing section of the material flow consists of several conveyor belts (11) that are connected end to end and whose width gradually decreases along the conveying direction.

6. The multi-stage rejection device according to claim 3, characterized in that, The branch flow path (1a) guides the raw material to multiple downstream parallel conveyor belts (11) through the guide plate (4) set at the outlet of the upstream main conveyor belt (1b). The conveying width of each of the downstream conveyor belts (11) is smaller than the conveying width of the upstream main conveyor belt (1b).

7. The multi-stage rejection device according to any one of claims 5 or 6, characterized in that, A guide plate (5) is provided at the junction of two adjacent conveyor belts (11). The guide plate (5) has a slope along the conveying direction and narrows towards the center of the downstream belt on both sides of the transverse direction, so as to smoothly guide the material from the upstream belt to the downstream belt and reduce material retention.

8. The multi-stage rejection device according to claim 1, characterized in that, The conveying area of ​​the conveyor belt unit (1) and the flow diversion area formed by the guide plate (5) or guide plate (4) are provided with baffles on both sides. The baffles are provided with windows that allow the blowing airflow to pass through at the corresponding positions of each blowing mechanism (3) and with a debris discharge port at the relative position of the blowing airflow direction, so that the removed impurities can be discharged to the external receiving mechanism.

9. The multi-stage rejection device according to claim 1, characterized in that, Each of the blowing mechanisms (3) includes a ventilation pipe connected to an external air supply device and a nozzle communicating with the ventilation pipe, the blowing direction of the nozzle being along the belt surface of the conveyor belt (11).

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