Heterogeneous recycling system and method for rejected sliver by breeze sorting

Abstract

The invention discloses a stem rejected matter breeze sorting and equal-mass recycling system and method. The system comprises a stem discharging pipe, a high-angle belt and a vibrating screen which are arranged in sequence. An inlet of the stem discharging pipe is connected with a stem outlet of the cigarette making machine, an outlet of the stem discharging pipe is located above the high-angle belt, and a discharging opening of the high-angle belt is located above the vibrating screen. A groove is formed in a bottom plate of the vibrating screen, a pulse blowing device is arranged below the vibrating screen, a stem falling separating groove and a cut tobacco picking fork tooth are sequentially arranged on a discharging section of the vibrating screen, the upper portion of the stem collecting cavity is communicated with the upper portion of the cut tobacco collecting cavity, and a pair of fine selection rotating rollers rotating reversely is arranged at the communication position. According to the method, the technical methods such as a gravity mechanical primary selection mechanism, vibration layering, shifting stick fine selection, pulse air blowing assisted selection and air blowing humidifying are combined, a series of defects caused by a traditional suspension speed separation method are overcome, and efficient separation and equal-mass recycling of rejected slivers are achieved.

Description

Technical Field

[0001] This invention relates to the field of cigarette processing technology, specifically to a system and method for the micro-air sorting and recycling of stem residue. Background Technology

[0002] Tobacco shreds are shredded tobacco leaves cut into thin strands. As a core raw material in cigarette production, they directly affect the quality of cigarettes, including combustion and taste. The stems in the tobacco leaves are usually removed before shredding, but due to limitations in processing technology, some stems cannot be effectively separated and are cut into needle-like "stem skewers" along with the tobacco leaves. These skewers can easily puncture the cigarette during the rolling process (surface pinholes, tearing of the cigarette paper), and can also cause unstable draw resistance, sensory fluctuations, or even the cigarette going out. Therefore, while ensuring cigarette production efficiency and product quality, it is crucial to prevent these skewers from entering the cigarette. Precisely removing stem skewers from tobacco shreds is a core requirement of cigarette processing.

[0003] Stems and stalks are similar in shape to tobacco shreds (especially leaf shreds). Existing cigarette making machines use suspension velocity separation methods for removing stems and stalks, which makes it difficult to completely separate the tobacco shreds and stems in the removed material. When the amount of stems and stalks in the tobacco shreds of cigarettes exceeds the standard (>1.5%), there is a significant quality risk. When the removed stems and stalks contain too much tobacco shreds (5%-12%), it increases costs and is wasteful.

[0004] To address these issues, the industry primarily utilizes two methods to recover discarded tobacco stems and twigs: one is to add a small air-separation device behind the cigarette rolling machine, directly returning the recovered tobacco to the machine; the other is to transport it via ductwork to a centralized air-separation device for recycling. However, both methods employ a combination of high-speed air separation and high-speed pneumatic conveying, essentially extending the suspension velocity separation process. This leads to common drawbacks: firstly, the moisture content of the recovered tobacco is significantly reduced, deviating severely from the optimal 12% moisture content. This results in increased smoke irritation and insufficient aroma release during combustion, significantly lowering sensory quality and making immediate reuse by the same brand impossible. Furthermore, the recycling process easily causes a large proportion of breakage. Secondly, the continuous high-speed airflow separation and long-distance pneumatic conveying are energy-intensive and wasteful, impacting the cleanliness of the recycling area. The breakage and dust generated during recycling also severely diminish its reuse value. Therefore, the centralized tobacco recovery methods in the current technology cannot guarantee the quality of tobacco recycling, forcing it to be used at a lower grade or for tobacco sheet production, resulting in unnecessary waste and quality risks. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a system and method for the fine-grained recycling of stem and twig removal materials through a gentle breeze, thereby achieving flexible separation and timely recycling of the removed materials and ensuring the quality of the recycled tobacco.

[0006] The technical solution of the present invention is as follows: In a first aspect of the invention, a micro-air separation and recycling system for stem residue is provided, comprising a stem lowering pipe, a steep-angle belt, and a vibrating screen arranged sequentially; the inlet of the stem lowering pipe is connected to the stem outlet of a cigarette machine, the outlet of the stem lowering pipe is located above the steep-angle belt, and the discharge port of the steep-angle belt is located above the vibrating screen; a groove is provided on the bottom plate of the vibrating screen, a pulse blowing device is provided below the vibrating screen, a stem separation groove and a tobacco picking fork are arranged sequentially in the discharge section of the vibrating screen, a stem collection chamber is provided below the stem separation groove, a tobacco collection chamber is provided below the tobacco picking fork, the upper parts of the stem collection chamber and the tobacco collection chamber are connected, and a pair of counter-rotating refining rollers are provided at the connection position.

[0007] In some embodiments of the present invention, the pulse blowing device is located at the material inlet of the stem collection chamber. In some embodiments of the present invention, the air inlet of the pulse blowing device is connected in sequence to a humidifier and a fan, and the pulse blowing device is provided with airflow by the fan and the humidifier is used to increase the humidity of the gas.

[0008] In some embodiments of the present invention, the air outlet of the pulse blowing device is provided with a set of rotatable air locks, each air lock can rotate independently at a constant speed of 360°, and adjacent air locks rotate in opposite directions.

[0009] In some embodiments of the present invention, the steep-angle belt includes a conveyor belt and an L-shaped steep angle, wherein the L-shaped steep angle is disposed on the upper surface of the conveyor belt and is provided in multiple such arrangements at intervals along the transmission direction.

[0010] In some embodiments of the present invention, the grooves on the vibrating screen base plate are arranged in multiple radial patterns, and the width and depth of the grooves gradually increase along the material conveying direction.

[0011] In some embodiments of the present invention, the stem separation groove is a natural extension of the ditch or valley, and the depth of the stem separation groove increases sharply at the junction of the two.

[0012] In some embodiments of the present invention, the fork teeth are natural extensions of the grooves and peaks, penetrating and protruding from the stem-separating groove, and the protruding part is a cantilever structure.

[0013] In some embodiments of the present invention, the selection roller includes a roller shaft and a lever. The roller shaft is vertically arranged, and at least three layers of levers are arranged on the roller shaft from top to bottom. Each layer includes a plurality of levers evenly distributed in the circumferential direction, and the levers of adjacent layers are staggered at an angle in the circumferential direction.

[0014] In a second aspect of the invention, a method for the micro-sorting and recycling of stem residue is provided, comprising: The stems and skewer removed by the cigarette machine fall onto the steep-angle belt through the lower stem tube. The steep-angle belt steadily and continuously transports them to the bottom plate of the vibrating screen, where they bounce forward and are continuously thinned under the guidance of the radial grooves, providing a favorable condition for the separation of stems and shreds. Under the vibration of the vibrating screen, the stems and short tobacco shreds mixed in with them enter the valley of the trough, while the long tobacco shreds mixed in with the stems mostly float on the peak of the trough. When the stems and tobacco shreds pass the end of the trough, the depth of the stem separation trough suddenly increases, causing the stems and short tobacco shreds to fall, thus completing the rapid separation from the floating long tobacco shreds. After a short forward movement, they fall into the stem collection chamber. The long tobacco shreds continue to move forward above the picking fork teeth. A small number of long tobacco shreds slip between the picking fork teeth, but most of the long tobacco shreds continue to move forward until they fall into the tobacco collection chamber at the end of the picking fork teeth, and then fall into the cigarette machine to achieve the same brand of reuse. As the stems and short tobacco shreds fall from the stem separation trough into the stem collection chamber, a small amount of long tobacco shreds that slip down are caught by the pusher and pushed towards the tobacco collection chamber when they pass through the selection roller; while the stems and short tobacco shreds cannot be caught and continue to fall under the action of gravity until they enter the stem collection chamber, then enter the metering device for metering, and finally are sucked away by the suction and collected. During the separation and falling of tobacco shreds and stems, the pulse blowing device below the vibrating screen generates a downstream moist pulse blowing airflow, which blows tobacco shreds of various lengths that are mixed in with the stems into the tobacco shred collection chamber during the falling process. This improves the sorting effect while ensuring that the moisture content of the tobacco shreds does not decrease significantly, ensuring that the tobacco shreds of the same brand can be reused immediately without affecting the intrinsic quality of the cigarettes.

[0015] One or more technical solutions of the present invention have the following beneficial effects: (1) The present invention reduces the mixing degree of stem sticks and tobacco shreds by the coordinated work of the lower stem tube, steep angle belt, vibrating screen and selection roller, and improves the sorting efficiency by its gravity initial selection mechanism; its vibration layering method effectively prevents stem sticks from popping out of the groove peaks and ensures that long tobacco shreds pass smoothly through the picking fork teeth into the tobacco shred collection chamber, thus solving the problem of tobacco shreds containing too many stem sticks or stem sticks containing too many tobacco shreds caused by the traditional suspension velocity sorting method.

[0016] (2) The present invention uses cold and humid airflow to blow tobacco shreds. The small air volume and large impulse disturb the tobacco shreds to turn over and work together with the selection roller to improve the tobacco shred sorting effect. At the same time, it can replenish the moisture of the tobacco shreds. The moisture content of the tobacco shreds is basically not lost, which solves the problem of the significant decline in the internal quality of tobacco shreds caused by traditional suspension air separation and realizes the recycling of tobacco shreds of the same brand.

[0017] (3) This invention improves the sorting efficiency and effectiveness of removing stems and twigs, reduces waste through online recycling, lowers the energy consumption of the cigarette rolling machine during the rolling process, improves the process assurance capability, and is conducive to the cleanliness of the on-site environment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the micro-air sorting and recycling system for stem residues of the present invention; Figure 2 This is a top view of the vibrating screen and the selecting roller of the present invention; Figure 3 This is a side view of the vibrating screen of the present invention (viewed from the direction of the wire-picking fork teeth); Figure 4 This is a schematic diagram of the structure of the selected roller of the present invention; Figure 5 This is a schematic diagram of the principle of pulse airflow generation in the pulse blowing device of the present invention; wherein, A is a schematic diagram of air outlet at 0° phase of air lock, and B is a schematic diagram of air outlet at 30° phase of air lock; Figure 6 This is a flowchart illustrating the process of the micro-air sorting and recycling system for stem residues of the present invention.

[0019] In the diagram: 1. Cigarette machine stem outlet; 2. Stem drop tube; 3. Stem angle belt; 4. Vibrating screen bottom plate; 5. Groove valley; 6. Groove peak; 7. Stem separation groove; 8. Picking fork teeth; 9. Tobacco shred collection chamber; 10. Refining roller; 11. Stem stick collection chamber; 12. Metering device; 13. Fan; 14. Humidifier; 15. Pulse blowing device; 16. Paddle; 17. Air lock. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Example 1 In a typical embodiment of the present invention, a micro-wind sorting and recycling system for stem residue is proposed, such as... Figure 1As shown, the device includes a lower stem pipe 2, a steep-angle belt 3, and a vibrating screen arranged in sequence. The inlet of the lower stem pipe 2 is connected to the stem outlet 1 of the cigarette machine, and the outlet of the lower stem pipe 2 is located above the steep-angle belt 3. The lower stem pipe 2 is used to transport the stems separated by the cigarette machine onto the steep-angle belt 3. The discharge port of the steep-angle belt 3 is located above the vibrating screen, and the steep-angle belt 3 transports the stems onto the bottom plate 4 of the vibrating screen. The bottom plate of the vibrating screen has grooves; under the vibration of the vibrating screen, the stems vibrate and advance along the grooves. The discharge section of the vibrating screen 4 is sequentially equipped with a stem separation groove 7 and a fork tooth 8. The stems are placed in front of... The stems and tobacco shreds are separated at the stem separation groove 7 and the fork teeth 8. A stem collection chamber 11 is provided below the stem separation groove 7 to collect the separated stems. A tobacco collection chamber 9 is provided below the fork teeth 8 to collect the separated tobacco shreds. The upper parts of the stem collection chamber 11 and the tobacco collection chamber 9 are connected. A pair of counter-rotating refining rollers 10 are provided at the connection position. The refining rollers 10 can further separate the stems and tobacco shreds that are about to enter the stem collection chamber 11.

[0023] The aforementioned micro-air separation and recycling system for discarded tobacco stems achieves efficient separation and recycling of discarded stems through the coordinated operation of the stem-lowering pipe 2, the steep-angle belt 3, the vibrating screen, and the refining roller. The grooves, stem-dropping separation groove 7, and tobacco-picking fork teeth 8 of the vibrating screen achieve stratification and separation of tobacco shreds and stems. The vibration of the vibrating screen causes heavier and smaller stems to preferentially enter the grooves and valleys 5, while lighter and longer tobacco shreds float on the groove peaks 6. This gravity-based initial selection mechanism reduces the mixing of stems and tobacco shreds. The improved sorting efficiency and vibration stratification effectively prevent stems from popping out of the grooves and peaks 6, ensuring that long tobacco shreds pass smoothly through the picking fork teeth 8 into the tobacco collection chamber 9. When short tobacco shreds and a small amount of long tobacco shreds fall down from the stems and grooves 5, they are picked up by the selecting roller 10 and pushed into the tobacco collection chamber 9. Broken tobacco shreds and stems enter the stem collection chamber 11 under the action of gravity, effectively solving the problem of too many stems in tobacco shreds or too many tobacco shreds in stems caused by the traditional suspension velocity sorting method.

[0024] In this embodiment, the pulse blowing device 15 is mounted at the inlet of the stem collection chamber 11 below the bottom plate 4 of the vibrating trough, and is used to generate pulsed airflow. The air outlet of the pulse blowing device 15 faces the material inlet of the stem collection chamber 11, assisting the selection roller 10 in separating stems and tobacco. The air inlet of the pulse blowing device 15 is connected in sequence to the humidifier 14 and the fan 13. The constant flow of air generated by the fan 13 is humidified by the water in the humidifier 14 and then escapes. The humidified air then enters the pulse blowing device 15 and passes through the pulse blowing device 15 before being blown toward the material inlet of the stem collection chamber 11.

[0025] It can be understood that the pulse blowing device 15 assists in separating short tobacco shreds from stems by providing a moist breeze. The pulse blowing device 15 uses a small air volume and a large impulse pulse blowing to avoid excessive impact of high-speed airflow on the tobacco shreds, reducing the breakage and moisture evaporation of the tobacco shreds during the sorting process. By adjusting the air humidity through the humidifier 14, the moisture lost by the tobacco shreds can be appropriately replenished, ensuring that the quality of the recycled tobacco shreds is not reduced and that the internal quality remains unchanged. The pulse blowing device 15 works in conjunction with the selecting roller 10 to further optimize the separation effect. When the short tobacco shreds and stems fall into the stem collection chamber 11, the pulse blowing can disturb the tobacco shreds and increase the chance of contact with the paddle 16 of the selecting roller 10, thereby enhancing the sorting effect of stems and tobacco shreds.

[0026] The principle behind the pulse blowing device generating a pulsed breeze is as follows: Figure 5 As shown, the air outlet of the pulse blowing device 15 is equipped with a set of rotatable air locks 17. Each air lock 17 can rotate independently at a constant speed of 360°, and adjacent air locks 17 rotate in opposite directions (counterclockwise and clockwise). The output of pulsed micro-wind is achieved by utilizing the rotation process of the air locks 17. The outlet is close to closed at the 0° and 180° phases, and the air volume is minimal. The air volume is maximum at the 90° and 270° phases.

[0027] In this embodiment, the steep-angle belt 3 includes a conveyor belt and L-shaped steep angles. The L-shaped steep angles are set on the upper surface of the conveyor belt, and multiple L-shaped steep angles are set at intervals along the transmission direction. The L-shaped steep angles can effectively prevent the stems from slipping or scattering during the conveying process, ensuring that the material is smoothly conveyed to the vibrating screen. Compared with traditional wind-driven lifting, windless conveying avoids the drying effect of airflow on the tobacco. In addition, the interval arrangement of multiple L-shaped steep angles increases the conveying stability of the conveyor belt, so that the stems are evenly distributed on the bottom plate 4 of the vibrating screen, avoiding accumulation or flow interruption, and laying a stable foundation for subsequent vibration stratification.

[0028] like Figure 2 and Figure 3 As shown, the bottom plate of the vibrating screen has multiple grooves arranged radially, which induces the stems and stalks to spread thin during the vibration, thereby improving the processing efficiency. The width and depth of the grooves and valleys 5 gradually increase along the material conveying direction, ensuring that the stems and stalks and short tobacco shreds are straightened and fall smoothly into the stem separation tank 7, so that the long tobacco shreds float on the groove peaks 6 and are layered.

[0029] Furthermore, the bottom of each groove of the stem separation groove 7 is connected to the end of each valley 5 of the ditch, and the width of the stem separation groove 7 is the same as the end of the valley 5, while the depth of the groove is greater than that of the valley 5. This ensures a seamless transition between the stem sticks and tobacco shreds after vibration and stratification, achieving the initial separation of the stem sticks and long tobacco shreds, and avoiding splashing loss of materials during the transfer process.

[0030] Furthermore, the picking fork teeth 8 are provided in multiple forms, with the upper surface of each tooth flush with the groove peaks 6. This ensures that the tobacco shreds are always smoothly guided from the groove peaks 6 to the fork teeth 8 and fall into the tobacco collection chamber 9 during vibration conveying. In addition, the cross-sectional width and height of the picking fork teeth 8 gradually decrease at their ends. This gradient structure reduces resistance and decreases the chance of long tobacco shreds accidentally slipping into the stem collection chamber 11.

[0031] like Figure 4 As shown, the refining roller 10 includes a roller shaft and paddle rollers 16. The roller shaft is vertically arranged, and at least three layers of paddle rollers 16 are arranged on the roller shaft from top to bottom. Each layer includes multiple paddle rollers 16, and these paddle rollers 16 are evenly distributed in the circumferential direction. The paddle rollers 16 in adjacent layers are staggered at a set angle in the circumferential direction. Specifically, each layer is provided with four paddle rollers 16, and the paddle rollers 16 in adjacent layers are staggered at a set angle, which increases the frequency and range of contact with the material.

[0032] In this embodiment, both the tobacco collection chamber and the stem collection chamber 11 are funnel-shaped. The tobacco collection chamber is connected to the tobacco storage area of ​​the cigarette machine below. The stem collection chamber 11 is connected in sequence to the metering device 12 and the stem recycling device below. All components in the system are connected to the control unit and are controlled by the control unit to operate.

[0033] The working principle of the entire system is as follows: The stems and scraps collected from the cigarette machine's stem outlet 1 by the lower stem pipe 2 are conveyed to the top of the vibrating screen 4 via the steep-angle belt 3, and then fall naturally into the radial grooves of the vibrating screen. The radial grooves of the vibrating screen achieve stratification of tobacco and stems, that is, long tobacco is in the peaks of the vibrating screen grooves, and short tobacco and stems are in the valleys of the vibrating screen. After being vibrated and conveyed, the long tobacco, short tobacco, and stems pass through the stem separation groove 7 of the vibrating screen. The long tobacco is conveyed into the tobacco collection chamber 9 by the picking fork teeth 8 of the vibrating screen. The tobacco in the tobacco collection chamber 9 is returned to the cigarette machine's tobacco storage machine, realizing the recycling of tobacco. Short tobacco shreds and stems enter the stem collection chamber 11 through the stem separation trough 7 of the vibrating screen. A pulse blowing device 15 is provided on one side of the stem collection chamber 11, which intermittently blows a moist breeze to the short tobacco shreds and stems to separate them and humidify the tobacco shreds. On the other side of the stem collection chamber 11, a refining roller 10 is provided to separate the short tobacco shreds and stems after being screened by the breeze. The short tobacco shreds enter the tobacco collection chamber 9 through the refining roller 10 and are sent back to the cigarette machine's tobacco storage machine along with the long tobacco shreds to achieve tobacco recycling. The stems enter the stem collection chamber 11 under the action of gravity and are recovered by the stem collection device after being metered.

[0034] Example 2 In a typical embodiment of the present invention, a method for the wind-sorting and recycling of stem residue is provided, comprising: The stems and skewers removed by the cigarette machine fall onto the steep-angle belt 3 through the lower stem pipe 2, and are then conveyed to the vibrating screen bottom plate 4 via the steep-angle belt 3. Under the vibration of the vibrating screen 4, the stem sticks enter the valley 5 of the groove, while the long tobacco mixed in the stem sticks floats on the peak 6 of the groove. When the stem sticks and tobacco pass the end of the groove, the stem sticks and short tobacco fall into the stem separation groove 7 and are separated from the long tobacco. Then the stem sticks and short tobacco fall towards the inlet of the stem stick collection chamber 11. The long tobacco continues to move forward after being picked up above the picking fork teeth 8 until it falls into the tobacco collection chamber 9. As the stem sticks and short tobacco shreds fall from the stem separation groove into the stem stick collection chamber 11, the selection roller 10 pushes the accidentally slipped long tobacco shreds into the tobacco collection chamber, while the stem sticks enter the stem stick collection chamber 11 under the action of gravity.

[0035] Furthermore, during the process of the selection roller 10 picking up long tobacco shreds, the pulse blowing device 15 blows a moist pulse of air into the selection roller 10, blowing the short tobacco shreds that could not be separated by the selection roller towards the tobacco collection chamber 9, which further improves the tobacco shred recovery rate in the stems and reduces the tobacco content in the recovered stems.

[0036] For detailed steps, please refer to [link / reference]. Figure 6 ,include: S1. Windless lifting: The removed stems and twigs enter the lower stem pipe 2 through the stem outlet 1 of the cigarette machine, and are conveyed to the bottom plate of the vibrating screen by the steep-angle belt 3.

[0037] S2, Vibration stratification: After the stems and scraps enter the vibrating screen, they bounce forward. The heavier and smaller stems first enter the vibrating screen groove 5 and are straightened and spread out. As the groove 5 widens and deepens, the heavier and larger stems gradually enter the groove and press down on the heavier and smaller stems, preventing them from popping out of the vibrating screen peaks. Meanwhile, the long tobacco strands float above the groove peaks 6 due to their length and lightness.

[0038] S3. Stem and Pulp Separation: The stems and short tobacco shreds that have entered the valley 5 through the radial grooves fall into the bottom of the stem separation trough 7 due to the steep increase in trough depth at the end of the groove on the vibrating screen bottom plate, and then continue to fall into the inlet of the stem collection chamber 11; the layer of long tobacco shreds on the ridge 6 continues to move forward above the fork teeth, and enters the tobacco collection chamber 9 after passing through the picking section. It should be noted that during this process, some tobacco shreds may accidentally slip into the stem separation trough and fall into the inlet of the stem collection chamber 11.

[0039] S4. Stem Selection: Stems, short tobacco shreds, and long tobacco shreds that accidentally slip into the stem collection chamber 11 pass through a set of opposing rotating selection rollers 10 (counterclockwise and clockwise) during their fall. The long and short tobacco shreds are pushed towards the tobacco collection chamber by the pusher 16 of the selection rollers 10 and fall into the cigarette machine's tobacco storage area; while broken tobacco shreds and stems fall towards the stem collection chamber 11 under the action of gravity.

[0040] S5. Gentle Breeze Assisted Selection: A pulse blowing device 15 is provided on one side of the stem collection chamber 11. The pulsed blowing achieves a small air volume and a large impulse, blowing towards the stems falling into the stem collection chamber 11, disturbing the tobacco shreds mixed in, making it easier to effectively separate from the stems, and reducing the chance of long shreds accidentally slipping off the picking fork teeth 8; the moist pulsed breeze is blown into the humidifier 14 by the fan 13 and then enters the pulse blowing device 15, which can appropriately replenish the moisture of the tobacco shreds and ensure that the quality of the tobacco shreds is not reduced.

[0041] S6. Same Brand Reuse: The tobacco shreds pass through the tobacco shred collection chamber 9 and fall directly into the cigarette machine's shred storage area, realizing immediate reuse of the same brand; the stem sticks in the stem stick collection chamber 11 are measured by the metering device 12 and then sucked away by the stem stick collection device for centralized recycling.

[0042] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A micro-air sorting and recycling system for stem-removed materials, characterized in that, The device includes a stem-lowering pipe, a steep-angle belt, and a vibrating screen arranged in sequence. The inlet of the stem-lowering pipe is connected to the stem outlet of the cigarette machine, and the outlet of the stem-lowering pipe is located above the steep-angle belt. The discharge port of the steep-angle belt is located above the vibrating screen. The bottom plate of the vibrating screen is provided with grooves, and a pulse blowing device is provided below the vibrating screen. The discharge section of the vibrating screen is provided with a stem-falling separation groove and a tobacco picking fork tooth in sequence. A stem-collecting chamber is provided below the stem-falling separation groove, and a tobacco shred collection chamber is provided below the tobacco picking fork tooth. The upper parts of the stem-collecting chamber and the tobacco shred collection chamber are connected, and a pair of counter-rotating refining rollers are provided at the connection position.

2. The micro-air sorting and recycling system for stem-removed materials as described in claim 1, characterized in that, The pulse blowing device is located at the material inlet of the stem collection chamber.

3. The micro-air sorting and recycling system for stem-removed materials as described in claim 2, characterized in that, The air inlet of the pulse blowing device is connected in sequence to a humidifier and a fan. The pulse blowing device is provided with airflow by the fan and the humidifier increases the humidity of the gas.

4. The micro-air sorting and recycling system for stem-removed materials as described in claim 2, characterized in that, The air outlet of the pulse blowing device is equipped with a set of rotatable air locks. Each air lock can rotate independently at a constant speed of 360°, and adjacent air locks rotate in opposite directions.

5. The micro-air sorting and recycling system for stem-removed materials as described in claim 1, characterized in that, The steep-angle belt includes a conveyor belt and an L-shaped steep angle. The L-shaped steep angle is disposed on the upper surface of the conveyor belt and is arranged in multiple ways at predetermined intervals along the transmission direction.

6. The micro-air sorting and recycling system for stem-removed materials as described in claim 1, characterized in that, The bottom plate of the vibrating screen has multiple radial grooves, and the width and depth of the grooves gradually increase along the material conveying direction.

7. The micro-air sorting and recycling system for stem-removed materials as described in claim 6, characterized in that, The stem separation groove is a natural extension of the ditch and valley, and the depth of the stem separation groove increases sharply at the junction of the two.

8. The micro-air sorting and recycling system for stem-removed materials as described in claim 7, characterized in that, The picking fork teeth are natural extensions of the grooves and peaks, penetrating and protruding from the stem-dropping separation groove, with the protruding part being a cantilever structure.

9. The micro-air sorting and recycling system for stem-removed materials as described in claim 1, characterized in that, The selection roller includes a roller shaft and a lever. The roller shaft is vertically arranged, and at least three layers of levers are arranged on the roller shaft from top to bottom. Each layer includes multiple levers evenly distributed in the circumferential direction, and the levers in adjacent layers are staggered at an angle in the circumferential direction.

10. A method for the micro-sorting and recycling of stem-removed material, implemented using the system described in any one of claims 1-9, characterized in that, include: The stems and skewer removed by the cigarette machine fall onto the steep-angle belt through the lower stem tube. The steep-angle belt steadily and continuously transports them to the bottom plate of the vibrating screen, where they bounce forward and are continuously thinned under the guidance of the radial grooves, providing a favorable condition for the separation of stems and shreds. Under vibration, the stems and short tobacco shreds mixed in with them enter the valley of the groove, while the long tobacco shreds mixed in with the stems mostly float on the peaks of the groove. When the stems and tobacco shreds pass the end of the groove, the depth of the stem separation groove suddenly increases, causing the stems and short tobacco shreds to fall, thus completing the rapid separation from the floating long tobacco shreds. After a short forward movement, they fall into the stem collection chamber. The long tobacco shreds continue to move forward above the picking fork teeth. A small number of long tobacco shreds slip between the picking fork teeth, but most of the long tobacco shreds continue to move forward until they fall into the tobacco collection chamber at the end of the picking fork teeth. Then they fall into the cigarette machine to achieve immediate reuse of the same brand. As the stems and short tobacco shreds fall from the stem separation trough into the stem collection chamber, a small amount of long tobacco shreds that slip off are caught by the pusher and pushed towards the tobacco collection chamber when they pass through the selection roller; while the stems and short tobacco shreds cannot be caught and continue to fall under the action of gravity until they enter the stem collection chamber, then enter the metering device for metering, and finally are sucked away by the suction and collected. During the separation and falling of tobacco shreds and stems, the pulse blowing device below the vibrating screen generates a downstream moist pulse blowing airflow, which blows tobacco shreds of various lengths that are mixed in with the stems into the tobacco shred collection chamber during the falling process. This improves the sorting effect while ensuring that the moisture content of the tobacco shreds does not decrease significantly, ensuring that the tobacco shreds of the same brand can be reused immediately without affecting the intrinsic quality of the cigarettes.

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