A method for identifying and removing stems in tobacco by photoelectric imaging technology in real time

Abstract

The application discloses a method for identifying and removing stems in tobacco by using photoelectric imaging technology in real time, wherein a wind feeding system (2) disperses the tobacco by using wind, when the dispersed tobacco passes through a stem visual identification system (3), the stem visual identification system (3) performs photoelectric color identification on the material one by one, scans and images the individual shape characteristic size parameters, and transmits signals to an image processing and blowing control system (5), the image processing and blowing control system (5) performs algorithm analysis on the received transmission signals, distinguishes the stems in the scanning image, and sends control signals to a compressed air blowing removal system (4), the compressed air blowing removal system (4) blows the stems into a stem collector by compressed air blowing. The stem identification and removal device for tobacco can efficiently identify and remove the stems in the tobacco, avoids the problem of unstable detection results caused by manual selection, improves the effect, and saves manpower.

Description

Technical Field

[0001] This invention belongs to the technical field of tobacco machinery and equipment, and relates to a device for identifying and removing tobacco stems, specifically a device for identifying and removing tobacco stems from a certain amount of dried tobacco samples, and a method for real-time identification and removal of tobacco stems using photoelectric imaging technology. Background Technology

[0002] In recent years, with the continuous development of cigarette rolling technology, cigarette specifications have shown a trend of diversified development, with varieties including coarse, medium, and fine cigarettes based solely on their circumference. When rolling cigarettes with different circumferences, the particle size (length and thickness) of the stems in the tobacco has varying impacts on cigarette quality. To control the particle size of the stems in the tobacco when rolling cigarettes with different circumferences in the most economical way, and to reduce the impact of the stems on cigarette quality, it is necessary to test the particle size of the stems in the sample tobacco. To facilitate the detection of stem particle size, the stems should be separated from the tobacco. Currently, a combination of air separation and manual sorting is mainly used to pick out the stems. Since air separation separates materials based on differences in floating speed, when the floating speed of some small stems is close to that of the tobacco, the small stems cannot be separated from the tobacco. To achieve the desired sorting effect, the material after air separation needs to be manually picked. Due to the aforementioned reasons, the current sorting efficiency of the stem tags is low, and the test results are unstable.

[0003] To address the above problems, this invention is proposed. Summary of the Invention

[0004] This invention aims to solve the problems existing in the prior art by providing a device for identifying and removing stems from tobacco shreds, and a method for real-time identification and removal of stems from tobacco shreds using photoelectric imaging technology. After being thinned by a vibrating conveyor 1.2, the tobacco shreds enter the tobacco conveying pipe 2.2 of the pneumatic conveying system 2 under the action of negative pressure suction airflow. The tobacco shreds entering the pneumatic conveying pipe 2.2 move rapidly under the action of high-speed airflow, increasing the distance between individual materials and causing them to become discrete. When the tobacco shreds in the pneumatic conveying pipe move at high speed in a discrete state to the area illuminated by the light source, the stem visual recognition system 3 performs photoelectric color identification and detects the individual shape and size parameters of the materials. The identification and detection data are processed by the image processing and blowing control system 5, which identifies stems of a certain size in the tobacco shreds and sends a signal to the removal system. The compressed air blowing removal system 4 automatically blows away the identified and detected stems.

[0005] This invention provides a method for real-time identification and removal of stems and twigs in tobacco using photoelectric imaging technology. The method uses a tobacco stem and twig identification and removal device, which includes a tobacco feeding system 1, a pneumatic feeding system 2, a stem and twig visual recognition system 3, a compressed air blowing removal system 4, and an image processing and blowing control system 5.

[0006] The identification and removal method is as follows: The wind-powered tobacco feeding system 2 uses wind-dispersed airflow to discretize the tobacco shreds. When the tobacco shreds pass through the stem visual recognition system 3 in a discrete state at a set speed, the stem visual recognition system 3 performs photoelectric color identification on each material passing through the viewing area and scans the individual shape feature size parameters to form an image. The color identification and image signal are transmitted to the image processing and blowing control system 5. The image processing and blowing control system 5 performs algorithm analysis on the received transmitted signal to distinguish the stems in the tobacco shreds in the scanned image. At the same time, it sends a control signal to the compressed air blowing removal system 4. The compressed air blowing removal system 4 uses compressed air to automatically blow the stems into the stem collector.

[0007] Preferably, the speed is set to 17-22 m / s.

[0008] Preferably, the tobacco feeding system 1 includes a hopper 1.1, a vibrating conveyor 1.2, and a machine frame 1.3;

[0009] The vibrating conveyor 1.2 is installed below the hopper 1.1. The vibrating conveyor 1.2 conveys and spreads the tobacco shreds in the hopper 1.1. The amplitude of the vibrating conveyor 1.2 is adjustable and can meet the tobacco shred conveying capacity of 0.5 to 5 kg / h.

[0010] Preferably, the pneumatic tobacco feeding system 2 includes a feed inlet 2.1, a tobacco pneumatic conveying pipe 2.2, a pipe support 2.3, a static pressure viewfinder 2.4, a stem collection device 2.5, a tobacco separation and collection device 2.6, and a fan and air volume controller 2.7.

[0011] The tobacco feeding system 1, the stem and twig visual recognition system 3, and the compressed air blowing and removal system 4 are respectively installed above the tobacco air conveying pipe 2.2;

[0012] The image processing and blowing control system 5 is installed between the stem visual recognition system 3 and the compressed air blowing rejection system 4, and is located above the wind-powered yarn feeding system 2.

[0013] Preferably, the tobacco conveying duct 2.2 is a horizontally installed rectangular duct. One end of the tobacco conveying duct 2.2 is the feeding end, which is equipped with a feeding port 2.1. The other end of the tobacco conveying duct 2.2 is the discharging end, which is connected to the tobacco separator and collector 2.6.

[0014] The upper part of the tobacco air delivery duct 2.2 has an elongated through hole, and a static pressure viewfinder 2.4 is installed on the outside of the duct wall at the through hole;

[0015] A stem collection device 2.5 is installed below the tobacco pneumatic conveying duct 2.2.

[0016] Preferably, the compressed air blowing and removal system 4 includes a compressed air source 4.1 and a nozzle 4.2, the nozzle 4.2 being vertically aligned with the stem collection device 2.5; compressed air is ejected through the nozzle 4.2 and blows the stems in the tobacco air delivery pipe 2.2 into the stem collection device 2.5.

[0017] Preferably, the tag visual recognition system 3 includes a light source 3.1 and an image acquisition camera 3.2.

[0018] Preferably, the image processing and blowing control system 5 processes the image acquired by the stem tag visual recognition system 3 and controls the compressed air blowing removal system 4.

[0019] Preferably, the static pressure viewfinder 2.4 includes a vacuum fan 2.4.1, an air intake pipe 2.4.2, and a static pressure chamber 2.4.3. The static pressure chamber 2.4.3 is made of colorless transparent glass. The inner cavity of the static pressure chamber 2.4.3 is connected to the air intake of the vacuum fan 2.4.1 through the air intake pipe 2.4.2. This ensures that the static pressure inside the static pressure viewfinder is essentially the same as the static pressure inside the air delivery pipe at the lower slit, preventing airflow from entering the air delivery pipe from the lower slit and causing turbulent airflow within the pipe. The static pressure chamber is an essential accessory for the air delivery system to reduce dynamic pressure, increase static pressure, stabilize airflow, and reduce airflow vibration, thus improving the air delivery effect. The static pressure chamber is a device that allows airflow to pass through while effectively preventing or reducing the outward propagation of sound energy.

[0020] Preferably, the static pressure box 2.4.3 in the static pressure viewfinder 2.4 has an upper slit 2.4.3.1 and a lower slit 2.4.3.2 respectively on its upper and lower glass plates. The slit width meets the requirements of the visual recognition system 3 for color identification and scanning imaging of individual shape feature size parameters. The slit is one of the main components of the spectrometer, and it is a narrow and elongated slit with adjustable width.

[0021] Preferably, the static pressure (negative pressure) value inside the static pressure box 2.4.3 in the static pressure viewfinder 2.4 can be adjusted by the vacuum fan 2.4.1, and the air volume and negative pressure value of the vacuum fan 2.4.1 are adjustable.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention utilizes photoelectric imaging technology to acquire images of tobacco shreds and stems in real time during pneumatic conveying, and uses this data to analyze and identify the stems contained within the tobacco shreds. Specifically, a photoelectric imaging system is installed on the tobacco conveying duct to scan and photograph the moving tobacco shreds and stems, and the images are analyzed in real time to identify the stems contained in each frame and determine the positional parameters of the identified stems, providing accurate data for the next step of precise stem removal. Currently, there are no reports in the tobacco industry of using photoelectric imaging technology to identify stems in high-speed moving tobacco shreds in tobacco processing lines. This invention proposes a method for identifying stems in high-speed moving tobacco shreds using photoelectric imaging technology, providing another option for identifying and removing stems from tobacco shreds before cigarette production. Especially for slim cigarettes, where the morphology and density of tobacco shreds and stems are similar, flexible air separation is difficult to remove stems. Using photoelectric imaging technology to identify stems with a precise stem length of 3mm, combined with a removal system, may be the only way to further improve the purity of tobacco shreds. This method will become increasingly widespread as slim cigarettes become more common.

[0024] 2. Currently, in re-drying and cigarette production, materials are conveyed using high-speed belt conveyors or drop conveyors. High-speed belt conveyors typically operate at speeds ≤5 m / s; otherwise, the material cannot move alongside the belt. Drop conveyors follow the law of gravity acceleration, requiring very long drop troughs to achieve high-speed movement of the tobacco material, which is impractical in production. For tobacco containing stems, neither method can thin the material enough for machine vision to clearly and accurately identify the stems. Based on this reality, and considering the difference in movement speed between tobacco and stems due to their different physical properties, the material's movement speed should be no less than 17 m / s. This invention uses pneumatic conveying to achieve a tobacco transmission speed of 17-22 m / s. This ensures that the tobacco and stems are not affected by their physical properties and can move at a uniform speed; it also allows for a certain amount of material transfer even after thinning, enabling practical application on the production line.

[0025] 3. This invention provides a device for identifying and removing stems from tobacco shreds. After being thinned by a vibrating conveyor 1.2, the tobacco shreds enter the tobacco conveying pipe 2.2 of the pneumatic conveying system 2 under the action of a negative pressure suction airflow. The tobacco shreds entering the pneumatic conveying pipe 2.2 accelerate under the action of the high-speed airflow in the pipe, increasing the distance between individual material particles and causing them to become discrete. When the tobacco shreds in the pneumatic conveying pipe move at high speed in a discrete state to the area illuminated by the light source, the stem visual recognition system 3 performs photoelectric color identification and detects the individual shape and size parameters of the material. The identification and detection data are processed by the image processing and blowing control system 5, which identifies stems of a certain size in the tobacco shreds and sends a signal to the removal system. The compressed air blowing removal system 4 automatically blows away the identified and detected stems.

[0026] The tobacco stem identification and removal device of the present invention can efficiently identify and remove tobacco stems, avoiding the problem of unstable results from manual selection and testing, while also improving efficiency and saving manpower.

[0027] 4. A static pressure viewfinder 2.4 is installed on the tobacco conveying duct 2.2 of this invention. The function of the static pressure viewfinder 2.4 is to ensure that the static pressure inside the static pressure viewfinder is basically the same as the static pressure inside the conveying duct at the lower slit; this prevents airflow from entering the conveying duct through the lower slit and causing turbulent airflow within the duct, which would affect the movement trajectory and speed of the material in the conveying duct. In other words, it can stabilize the airflow and reduce airflow vibration, thereby improving the accuracy and stability of the tobacco stick visual recognition system in identifying tobacco sticks. Attached Figure Description

[0028] Figure 1 A schematic diagram of the experimental device for identifying and removing tobacco stems using a tweezers.

[0029] Figure 2 Schematic diagram of the tobacco feeding system 1;

[0030] Figure 3 This is a schematic diagram of the structure of the wind-powered wire feeding system 2;

[0031] Figure 4 This is a schematic diagram of the static pressure viewfinder 2.4 structure;

[0032] Figure 5 This is a diagram illustrating the effect of identifying the stem tags in the tobacco shreds in this embodiment.

[0033] The names of the attached figures in the figure description are: 1. Tobacco feeding system; 2. Pneumatic feeding system; 3. Stem tag visual recognition system; 4. Compressed air blowing and rejection system; 5. Image processing and blowing control system.

[0034] 1.1 Hopper; 1.2 Vibrating conveyor; 1.3 Machine frame; 2.1 Feed inlet; 2.2 Tobacco shred air conveying duct; 2.3 Pipe support; 2.4 Static pressure viewfinder; 2.5 Stem collection device; 2.6 Tobacco shred separator and collector; 2.7 Fan and air volume controller; 3.1 Light source; 3.2 Image acquisition camera; 4.1 Compressed air source; 4.2 Nozzle;

[0035] Vacuum blower 2.4.1, suction pipe 2.4.2, static pressure box 2.4.3.

[0036] Upper slit 2.4.3.1, lower slit 2.4.3.2. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the embodiments.

[0038] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the field or according to the product instructions. Materials or equipment whose manufacturers are not specified are all conventional products that can be obtained by purchase.

[0039] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” to another element, it can be directly connected to the other element, or there may be an intermediate element. Furthermore, the term “connected” as used herein can include wireless connections.

[0040] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "inner," "upper," "lower," etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "equipped with" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0043] This embodiment is a tobacco stem and twig identification and removal device, which includes a tobacco feeding system 1, a pneumatic feeding system 2, a stem and twig visual recognition system 3, a compressed air blowing removal system 4, and an image processing and blowing control system 5.

[0044] The method for real-time identification and removal of stems in tobacco using photoelectric imaging technology is as follows: The wind-powered tobacco feeding system 2 uses airflow to disperse the tobacco. When the tobacco passes through the stem visual recognition system 3 at a set speed in a discrete state, the stem visual recognition system 3 performs photoelectric color identification and scans the individual shape and size parameters of each material passing through the viewing area. The color identification and image signals are transmitted to the image processing and blowing control system 5. The image processing and blowing control system 5 performs algorithm analysis on the received transmitted signals to distinguish the stems in the tobacco in the scanned image. At the same time, it sends a control signal to the compressed air blowing removal system 4. The compressed air blowing removal system 4 automatically blows the stems into the stem collector by compressed air blowing.

[0045] The speed is set to 18 m / s.

[0046] The tobacco feeding system 1 includes a hopper 1.1, a vibrating conveyor 1.2, and a machine frame 1.3;

[0047] The vibrating conveyor 1.2 is installed below the hopper 1.1. The vibrating conveyor 1.2 conveys and spreads the tobacco shreds in the hopper 1.1. The amplitude of the vibrating conveyor 1.2 is adjustable and can meet the tobacco shred conveying capacity of 0.5 to 5 kg / h.

[0048] The aforementioned pneumatic tobacco feeding system 2 includes a feed inlet 2.1, a tobacco pneumatic conveying pipe 2.2, a pipe support 2.3, a static pressure viewfinder 2.4, a stem collection device 2.5, a tobacco separation and collection device 2.6, and a fan and air volume controller 2.7.

[0049] The tobacco feeding system 1, the stem and twig visual recognition system 3, and the compressed air blowing and removal system 4 are respectively installed above the tobacco air conveying pipe 2.2;

[0050] The image processing and blowing control system 5 is installed between the stem visual recognition system 3 and the compressed air blowing rejection system 4, and is located above the wind-powered yarn feeding system 2.

[0051] The tobacco shred conveying duct 2.2 is a horizontally installed rectangular duct. One end of the tobacco shred conveying duct 2.2 is the feeding end, which is equipped with a feeding port 2.1. The other end of the tobacco shred conveying duct 2.2 is the discharging end, which is connected to the tobacco shred separator and collector 2.6.

[0052] The upper part of the tobacco air delivery duct 2.2 has an elongated through hole, and a static pressure viewfinder 2.4 is installed on the outside of the duct wall at the through hole;

[0053] A stem collection device 2.5 is installed below the tobacco pneumatic conveying duct 2.2.

[0054] The compressed air blowing and removal system 4 includes a compressed air source 4.1 and a nozzle 4.2, the nozzle 4.2 being vertically aligned with the stem collection device 2.5; compressed air is ejected through the nozzle 4.2 and blows the stems in the tobacco air delivery pipe 2.2 into the stem collection device 2.5.

[0055] The tag visual recognition system 3 includes a light source 3.1 and an image acquisition camera 3.2.

[0056] The image processing and blowing control system 5 processes the images acquired by the stem tag visual recognition system 3 and controls the compressed air blowing removal system 4.

[0057] The static pressure viewfinder 2.4 includes a vacuum fan 2.4.1, an air intake pipe 2.4.2, and a static pressure chamber 2.4.3. The static pressure chamber 2.4.3 is made of colorless transparent glass. Its inner cavity is connected to the air intake of the vacuum fan 2.4.1 via the air intake pipe 2.4.2. This connection ensures that the static pressure inside the static pressure viewfinder is essentially the same as the static pressure inside the air delivery duct at the lower slit, preventing airflow from entering the air delivery duct through the lower slit and causing turbulent airflow within the duct. The static pressure chamber is an essential component of the air delivery system, reducing dynamic pressure, increasing static pressure, stabilizing airflow, and reducing airflow vibration, thus improving the air delivery effect. The static pressure chamber is a device that allows airflow while effectively preventing or reducing the outward propagation of sound energy.

[0058] The static pressure viewfinder 2.4 has an upper slit 2.4.3.1 and a lower slit 2.4.3.2 respectively on its upper and lower glass plates. The slit widths meet the requirements of the visual recognition system 3 for color identification and scanning imaging of individual shape feature size parameters. A slit is one of the main components of a spectrometer; it is a narrow, elongated slit with adjustable width.

[0059] The static pressure (negative pressure) value inside the static pressure box 2.4.3 in the static pressure viewfinder 2.4 can be adjusted by the vacuum fan 2.4.1. The air volume and negative pressure value of the vacuum fan 2.4.1 are adjustable.

[0060] Combination Figure 1-4 The specific implementation method is as follows:

[0061] A device for identifying and removing tobacco stems, comprising as follows Figure 1 As shown, the system consists of: a tobacco feeding system 1; a pneumatic tobacco feeding system 2; a stem and twig visual recognition system 3; a compressed air blowing and removal system 4; and an image processing and blowing control system 5.

[0062] In this example, the test sample consisted of 3000 kg of tobacco shreds from a certain brand of slim cigarettes after the drying process. The TD-Z100 tobacco and stem separation device, commonly used in the tobacco industry based on wind flotation, was used to separate pure tobacco shreds and pure stems. Then, 500 g of pure tobacco shreds was divided into five equal portions of 100 g each. Next, 1.5 g, 2.5 g, 3.5 g, 4.5 g, and 5.5 g of pure stems were added to each of the five portions of pure tobacco shreds, respectively, and each portion of tobacco and stem mixture was thoroughly mixed. Finally, each portion of tobacco and stem mixture was sequentially placed into the tobacco feeding system 1 (…). Figure 2 In hopper 1.1 (as shown), the mixture of tobacco shreds and stems is spread thinly by the vibrating conveyor 1.2 (the amplitude of the vibrating conveyor 1.2 is adjustable). The spread tobacco shreds fall into the pneumatic feeding system 2 under gravity in an approximately single-layer state (with only a small overlap between individual materials). Figure 3 (As shown) Inside the feed inlet 2.1. The tobacco feeding system 1 can supply tobacco at a rate of 0.5 to 5 kg / h, which is adjustable within the range of 0.5 to 5 kg / h, to meet the requirement of taking more than 1,000 pictures in a single sample test.

[0063] Wind-powered yarn feeding system 2 ( Figure 3 The device (as shown) mainly consists of an inlet 2.1, a tobacco conveying duct 2.2, a support frame, a viewing assembly, a stem collector, a tobacco separator collector 2.6, a fan, and an airflow controller. Its function is that when tobacco is fed into the inlet 2.1 and thinned by the feeding system, it accelerates under the action of the high-speed airflow below the inlet 2.1 and the negative pressure suction airflow in the tobacco conveying duct 2.2, increasing the distance between individual tobacco particles and causing them to disperse. The dispersed tobacco particles are then drawn into the tobacco conveying duct 2.2 by the negative pressure airflow. Along the tobacco conveying direction, a long, narrow through-hole is machined at a predetermined position on the duct wall. A static pressure viewing assembly 2.4 is installed on the outer side of the duct wall at the through-hole. The static pressure viewing assembly 2.4... Figure 4(As shown) It mainly consists of a vacuum blower 2.4.1, an air intake pipe 2.4.2, and a static pressure box 2.4.3. The static pressure box 2.4.3 is made of colorless transparent glass, and a line light source can illuminate the object inside the tobacco delivery pipe 2.2 through the colorless transparent glass plate on the static pressure box 2.4.3. An upper slit 2.4.3.1 and a lower slit 2.4.3.2 are respectively provided on the upper and lower glass plates of the static pressure box 2.4.3, and a line scanning camera scans and images the object through the upper and lower slits. The inner cavity of the static pressure box is connected to the air intake of the vacuum blower 2.4.1 through the air intake pipe 2.4.2. The air volume and negative pressure value of the vacuum fan 2.4.1 are adjustable. The static pressure (negative pressure) value in the inner cavity of the static pressure box 2.4.3 can be adjusted by the vacuum fan 2.4.1, so that the static pressure (negative pressure) values ​​inside and outside the tobacco air delivery pipe 2.2 at the lower slit are basically the same, reducing the impact of airflow disturbance in the air delivery pipe on scanning imaging.

[0064] When tobacco shreds pass through the viewfinder's illumination area at a set speed in a discrete state, the stem and twig visual recognition system 3, positioned above the viewfinder, performs photoelectric color identification and individual shape feature size parameter scanning imaging on each material passing through the viewfinder, and transmits the color identification and image signals to the image processing and blowing control system 5. The image processing and blowing control system 5 performs algorithmic analysis on the received signals from the stem and twig visual recognition system 3 to distinguish the stems and twigs in the scanned image of the tobacco shreds. Simultaneously, it sends a control signal to the compressed air blowing removal system 4, which automatically blows the stems and twigs into the stem and twig collector using compressed air. Pure tobacco shreds and conveying gas enter the tobacco shred separation collector 2.6, where the tobacco shreds separate from the conveying gas, sink into the tobacco shred collection box, and the gas is discharged by a fan. The above process is repeated continuously, finally separating the stems and twigs from the tobacco shreds in the mixture. The effect of this invention in identifying stems and twigs in tobacco shreds is as follows: Figure 5 As shown.

[0065] The stem removal effect of the five test samples treated with the present invention in this embodiment was analyzed, as shown in Table 1. The wind speed of the pneumatic feeding system was designed to be 18 m / s. The stem removal rate was calculated as follows: Stem removal rate = (weight of removed stems / weight of mixed stems) × 100%.

[0066] Table 1. Analysis of the tobacco stem removal effect of five test samples based on the present invention.

[0067]

[0068] Depend on Figure 5It can be seen that the method of the present invention can efficiently identify stems and other debris in tobacco shreds. As shown in Table 1, using the stem and debris identification and removal device and method of the present invention, the stem and debris removal rate ranges from 90.36% to 93.60%, with an average of 91.99%. This demonstrates that the method of the present invention can effectively remove stems and other debris from tobacco shreds.

[0069] The above description is only used to detail the specific embodiments of the present invention, but the technical solutions proposed by the present invention are not limited to the above methods. All equivalent modifications and variations made by those skilled in the art to the technology proposed by the present invention without departing from the basic principles of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for real-time identification and removal of tobacco stems using photoelectric imaging technology, characterized in that, It uses a tobacco stem identification and removal device, which includes a tobacco feeding system (1), a pneumatic feeding system (2), a stem visual identification system (3), a compressed air blowing removal system (4), and an image processing and blowing control system (5). The identification and rejection method is as follows: The wind-powered feeding system (2) uses wind to separate the tobacco shreds. When the tobacco shreds pass through the stem visual recognition system (3) at a set speed in a discrete state, the stem visual recognition system (3) performs photoelectric color identification on each material passing through the viewing area and scans the individual shape feature size parameters. The color identification and image signal are transmitted to the image processing and blowing control system (5). The image processing and blowing control system (5) performs algorithm analysis on the received transmission signal, distinguishes the stems in the tobacco shreds in the scanned image, and sends a control signal to the compressed air blowing rejection system (4). The compressed air blowing rejection system (4) blows the stems into the stem collector by compressed air. The set speed is 17-22 m / s; The tobacco feeding system (1) includes a hopper (1.1), a vibrating conveyor (1.2), and a machine frame (1.3). The vibrating conveyor (1.2) is installed below the hopper (1.1) and conveys and spreads the tobacco shreds in the hopper (1.1). The amplitude of the vibrating conveyor (1.2) is adjustable and can meet the tobacco shred conveying capacity of 0.5~5kg / h. The aforementioned wind-powered tobacco feeding system (2) includes a feed inlet (2.1), a tobacco air conveying pipe (2.2), a pipe support (2.3), a static pressure viewfinder (2.4), a stem collection device (2.5), a tobacco separation collector (2.6), a fan and an air volume controller (2.7). The tobacco feeding system (1), the stem and twig visual recognition system (3), and the compressed air blowing and removal system (4) are respectively installed above the tobacco air conveying pipe (2.2); The image processing and jet blowing control system (5) is installed between the stem tag visual recognition system (3) and the compressed air jet blowing rejection system (4), and is located above the wind-powered yarn feeding system (2); The tobacco shred conveying pipe (2.2) is a horizontally installed air duct. One end of the tobacco shred conveying pipe (2.2) is the feeding end, which is equipped with a feeding port (2.1). The other end of the tobacco shred conveying pipe (2.2) is the discharging end, which is connected to the tobacco shred separator and collector (2.6). The upper part of the pipe wall of the tobacco air delivery pipe (2.2) has a through hole, and a static pressure viewfinder (2.4) is installed on the outside of the pipe wall at the through hole. A stem collection device (2.5) is installed below the tobacco air conveying duct (2.2); The compressed air blowing and removal system (4) includes a compressed air source (4.1) and a nozzle (4.2), the nozzle (4.2) being vertically aligned with the stem collection device (2.5); compressed air is ejected through the nozzle (4.2) and blows the stems in the tobacco air delivery pipe (2.2) into the stem collection device (2.5). The static pressure viewfinder (2.4) includes a vacuum fan (2.4.1), an air intake pipe (2.4.2), and a static pressure chamber (2.4.3); the static pressure chamber (2.4.3) is made of colorless transparent glass plate, and the inner cavity of the static pressure chamber (2.4.3) is connected to the air intake of the vacuum fan (2.4.1) through the air intake pipe (2.4.2); The static pressure viewfinder (2.4) has an upper slit (2.4.3.1) and a lower slit (2.4.3.2) on the upper and lower glass plates of the static pressure box (2.4). The width of the slits meets the requirements of the electrochromic identification and individual shape feature size parameter scanning imaging of the visual recognition system (3). The static pressure value inside the static pressure box (2.4.3) in the static pressure viewfinder (2.4) can be adjusted by the vacuum fan (2.4.1), and the air volume and negative pressure value of the vacuum fan (2.4.1) are adjustable.

2. The method according to claim 1, characterized in that, The tag visual recognition system (3) includes a light source (3.1) and an image acquisition camera (3.2).

3. The method according to claim 1, characterized in that, The image processing and blowing control system (5) processes the image acquired by the stem tag visual recognition system (3) and controls the compressed air blowing removal system (4).

Images