A multi-stage pulsed air flow loose tobacco unbanding system and method

Abstract

The application discloses a multi-stage pulsed airflow loose cut tobacco system and method, and relates to the technical field of loose cut tobacco, which comprises a pulsed vertical loosening machine; a discharge port of the pulsed vertical loosening machine is connected with an inlet of a vibrating sieve machine; a first outlet of the vibrating sieve machine is connected with a first discharge vibrating conveyor, and a second outlet is connected with a needle roller loosening machine; an outlet of the needle roller loosening machine is connected with a second discharge vibrating conveyor; a pulsed airflow jet cavity is arranged on each side of the pulsed vertical loosening machine; a plurality of pulsed airflow nozzles are arranged in each cavity; a screen is arranged in the middle of the vibrating sieve machine; a plurality of compressed air blowing pipes are arranged at the bottom of the screen; the needle roller loosening machine comprises a left needle roller, a lower needle roller and a right needle roller which are sequentially engaged; the rotating directions of the right needle roller and the lower needle roller are consistent, and the rotating direction of the left needle roller is opposite. The multi-stage pulsed airflow scattering mode is adopted to quickly loosen the cut tobacco, and the material crushing is low during loosening, and the loose cut tobacco has high loosening efficiency.

Description

Technical Field

[0001] This invention relates to the field of tobacco loosening technology, and in particular to a multi-stage pulsed airflow system and method for loosening tobacco clumps. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] During the cigarette manufacturing process, the moisture content of dried tobacco is usually low (12%~13%), and the tobacco tends to clump together. The clumps contain wet balls and stems. Wet balls can cause yellow spots on the tobacco, and stems can puncture the cigarette. If the clumps are not loosened sufficiently, they will directly affect the stability of the subsequent cigarette rolling process, leading to problems such as uneven cigarette density, high rates of empty ends and tight ends, and ultimately affecting the quality of the cigarette.

[0004] Traditional methods of loosening clumps of tobacco use mechanical methods, but the physical impact can cause significant breakage of tobacco with low moisture content. Some studies have used a pulsed airflow cross-shaped impact mode at the loosening machine to gently break up clumps. However, using only a single pulsed airflow impact mode results in a short residence time for the clumps in the chamber and a limited number of airflow impacts. For tightly packed clumps, a single impact is insufficient to completely break them up, leading to incomplete unclogging and residual clumps that can affect subsequent processing steps. Furthermore, there are issues with excessively strong local airflow impacts or blind spots in the airflow. On the one hand, this can cause the tobacco to be subjected to severe impacts, increasing the breakage rate; on the other hand, clumps in the airflow blind spots cannot be fully utilized, further exacerbating the problem of residual clumps. Summary of the Invention

[0005] To address the aforementioned issues, this invention proposes a multi-stage pulsed airflow loosening system and method for dispersing clumps of tobacco. This system employs a multi-stage pulsed airflow dispersing mode to rapidly loosen clumps of tobacco, resulting in lower material breakage during the loosening process and higher efficiency in dispersing clumps of tobacco.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a multi-stage pulsed airflow loosening tobacco declumping system, comprising: a frame and a pulsed vertical loosening machine disposed on the frame; The feed inlet of the pulse vertical loosening machine is connected to the feed vibrating conveyor, the discharge outlet of the pulse vertical loosening machine is connected to the inlet of the vibrating screen, the first outlet of the vibrating screen is connected to the first discharge vibrating conveyor, the second outlet is connected to the needle roller loosening machine, and the outlet of the needle roller loosening machine is connected to the second discharge vibrating conveyor. The pulse vertical loosening machine is provided with a pulse airflow injection chamber on each side, and each chamber is provided with multiple pulse airflow nozzles; The vibrating screen is equipped with a screen in the middle, and multiple sets of compressed air jet pipes are provided at the bottom of the screen. The needle roller loosening machine includes a left needle roller, a lower needle roller, and a right needle roller that mesh in sequence. The right needle roller and the lower needle roller rotate in the same direction, while the left needle roller rotates in the opposite direction.

[0007] As an alternative implementation, the pulse airflow nozzles in the pulse airflow injection chambers on both sides are symmetrically arranged, with consistent horizontal and vertical spacing between the pulse airflow nozzles, and the angle of the pulse airflow nozzles is adjustable.

[0008] As an alternative implementation, the distance between the topmost pulse airflow nozzle and the top of the pulse airflow injection chamber is not less than 300 mm.

[0009] As an alternative implementation, the compressed air jet pipe is sealed to the compressed air pipeline, and the compressed air jet pipe vibrates synchronously with the vibrating screen.

[0010] As an alternative implementation, the compressed air jet pipe sprays air towards the screen, with the upper part of the compressed air jet pipe 10mm~30mm above the screen and the lower part of the compressed air jet pipe at a height of not less than 300mm from the vibrating screen trough; the horizontal spacing between the compressed air jet pipes is 8cm~20cm.

[0011] As an alternative implementation, the screening zones and compressed air jetting zones on the vibrating screen are spaced apart.

[0012] As an alternative implementation, the left needle roller rotates clockwise, while the right needle roller and the lower needle roller rotate counterclockwise.

[0013] As an alternative implementation, the vibrating screen is provided with a top cover, which is opened and closed by a door latch.

[0014] As an alternative implementation, the tobacco shreds loosened by the pulse vertical loosening machine fall onto the vibrating screen. After being screened by the screen, the loosened tobacco shreds fall onto the trough of the vibrating screen. The clumps of tobacco shreds are further unclumped and loosened by the compressed air jet pipe, and then screened and loosened again. The loosened tobacco shreds are conveyed to the first discharge vibrating conveyor through the first outlet of the vibrating screen. Finally, the remaining clumps of tobacco shreds are conveyed to the needle roller loosening machine through the second outlet of the vibrating screen.

[0015] Secondly, the present invention provides a method for de-clumping tobacco using a multi-stage pulsed airflow, employing the multi-stage pulsed airflow de-clumping system of the first aspect, comprising: After drying and screening, the clumped tobacco shreds are evenly conveyed to the pulse vertical loosening machine by the feeding vibrating conveyor. Pulse airflow is injected into the pulse airflow injection chambers on both sides of the pulse vertical loosening machine and blows the clumped tobacco shreds at a set angle to achieve flexible loosening of the clumped tobacco shreds. The tobacco shreds loosened by the pulse vertical loosening machine fall onto the vibrating screen through the discharge port. After being screened by the screen, the loosened tobacco shreds fall onto the trough of the vibrating screen. The clumps of tobacco shreds continue to be unclumped and loosened in the compressed air blowing area of ​​the vibrating screen, and are screened and loosened again. The loosened tobacco shreds are then conveyed to the first discharge vibrating conveyor by the vibrating screen. The remaining clumps of tobacco conveyed by the vibrating screen are completely loosened by the needle roller loosener. After loosening, the tobacco is conveyed to the next process by the second discharge vibrating conveyor to complete the loosening of the clumps of tobacco.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention proposes a multi-stage pulsed airflow loosening system and method for tobacco shreds. Employing a multi-stage pulsed airflow loosening design, pulsed airflow blowing mechanisms are installed on both sides of the pulsed vertical loosening machine and at the bottom of the vibrating screen. This allows clumps of tobacco to be repeatedly subjected to the flexible action of the pulsed airflow, improving the dispersing effect on tightly clumped tobacco and effectively reducing the final residual clumps to meet subsequent processing requirements. Furthermore, the addition of a needle roller loosening machine further loosens the remaining small amount of clumps, significantly reducing the proportion and intensity of mechanical loosening, preserving the complete shape and length of the tobacco shreds to the greatest extent possible, and improving the whole tobacco yield. Simultaneously, through the motion control of the needle roller loosening machine, damage to the tobacco shreds from excessive mechanical action is avoided, while ensuring that all clumps are loosened, facilitating stable integration with subsequent cigarette-making processes and further improving the overall quality of cigarette processing.

[0017] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a front view of the multi-stage pulsed airflow loosening tobacco shred unpacking system provided in Embodiment 1 of the present invention; Figure 2 for Figure 1 A schematic diagram of the AA cross-sectional view structure in the diagram; Figure 3 for Figure 1 A schematic diagram of the partial view structure of the EE in the diagram; Figure 4 for Figure 1 Schematic diagram of the DD cross-sectional view structure in the diagram; Figure 5 for Figure 1 Schematic diagram of the BB cross-sectional view structure; Figure 6 for Figure 1 A schematic diagram of the CC local view structure in the diagram; The components include: 1. Frame; 2. Pulse valve; 3. Vibrating screen; 4. Compressed air jet pipe; 5. Compressed air pipeline; 6. Filter; 7. Shut-off valve; 8. Pressure regulating valve; 9. Pressure gauge; 10. Feeding vibrating conveyor; 11. Feeding dust hood; 12. Pulse airflow nozzle; 13. Pulse airflow jet chamber; 14. Telescopic sealing flexible connection; 15. Top cover; 16. Screen; 17. Door latch; 18. Screened material outlet; 19. Discharge dust hood; 20. Needle roller loosener; 21. First discharge vibrating conveyor; 22. Second discharge vibrating conveyor; 23. Pulse airflow jet hole; 24. Fixing nut; 25. Needle roller loosener frame; 26. Left needle roller; 27. Right needle roller; 28. Lower needle roller; 29. ​​Compressed air sealing telescopic flexible hose. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] 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 the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that the terms “comprising” and “including”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0024] Example 1 like Figure 1 As shown, this embodiment provides a multi-stage pulse airflow loosening tobacco declumping system, including: a frame 1 and a pulse vertical loosening machine mounted on the frame 1; The feed inlet of the pulse vertical loosening machine is connected to the feed vibrating conveyor 10, the discharge outlet of the pulse vertical loosening machine is connected to the inlet of the vibrating screen 3, the first outlet of the vibrating screen 3 is connected to the first discharge vibrating conveyor 21, the second outlet is connected to the needle roller loosening machine 20, and the outlet of the needle roller loosening machine 20 is connected to the second discharge vibrating conveyor 22. The pulse vertical loosening machine is provided with a pulse airflow injection chamber 13 on each side, and each chamber is provided with multiple pulse airflow nozzles 12; The vibrating screen 3 is provided with a screen 16 in the middle, and multiple sets of compressed air jet pipes 4 are provided at the bottom of the screen 16. The needle roller loosening machine 20 includes a left needle roller 26, a lower needle roller 28 and a right needle roller 27 that mesh in sequence. The right needle roller 27 and the lower needle roller 28 rotate in the same direction, while the left needle roller 26 rotates in the opposite direction.

[0025] In this embodiment, as Figures 1-3 As shown, the pulse vertical loosening machine is enclosed on all sides, with the feed inlet connected to the feed vibrating conveyor 10 and the discharge outlet connected to the inlet of the vibrating screen 3 through a sealed connection.

[0026] A pulse airflow injection chamber 13 is provided on each of the left and right sides of the pulse vertical loosening machine. Each pulse airflow injection chamber 13 is provided with multiple pulse airflow blowing holes 23, and each pulse airflow blowing hole 23 is provided with a pulse airflow nozzle 12.

[0027] As an alternative implementation, the pulse airflow nozzles 12 inside the pulse airflow injection chambers 13 on both sides are symmetrically arranged, with the horizontal spacing between the pulse airflow nozzles 12 being consistent, the vertical spacing being consistent, and the angle of the pulse airflow nozzles 12 being adjustable.

[0028] Understandably, the horizontal spacing, vertical spacing, and angle of the pulse airflow nozzles 12 can be adaptively adjusted according to the actual application. For example, the horizontal spacing can be set to 2cm~6cm, the vertical spacing to 2cm~8cm, and the angle to 0~30°. However, this embodiment is only an example and is not limited to these values.

[0029] As an alternative implementation, the distance between the topmost pulse airflow nozzle 12 and the top of the pulse airflow injection chamber 13 is not less than 300 mm.

[0030] As an alternative implementation, the pulse airflow nozzle 12 is mounted inside the pulse airflow jet hole 23 by a fixing nut 24, such as Figure 3 As shown.

[0031] As an alternative implementation, the feed inlet of the pulse vertical loosening machine is equipped with a feed dust hood 11, and the discharge outlet of the vibrating screen 3 is equipped with a discharge dust hood 19. Thus, the dust-laden airflow is transported to the dust collector through the exhaust hood for purification.

[0032] In this embodiment, each pulse airflow injection chamber 13 delivers compressed air through a compressed air pipe 5. Specifically: The inlet of compressed air pipeline 5 can be connected to an external air collection tank; The compressed air pipeline 5 is equipped with a filter 6, a shut-off valve 7, a pressure regulating valve 8 and a pressure gauge 9 in sequence along the direction of compressed air flow; The outlet of the compressed air pipeline 5 is connected to the pulse airflow nozzle 12 via the pulse valve 2, and the pulse valve 2 can be connected to multiple pulse airflow nozzles 12.

[0033] As an alternative implementation, the pulse frequency of pulse valve 2 can be set to 0.2Hz~0.8Hz (but is not limited to this), and all pulse valves 2 work synchronously during operation.

[0034] In this embodiment, the inlet of the vibrating screen 3 is sealed to the outlet of the pulse vertical loosening machine through a retractable sealing flexible connection 14, the outlet of the vibrating screen is connected to the inlet of the needle roller loosening machine 20, and the outlet of the needle roller loosening machine 20 is connected to the second discharge vibrating conveyor 22.

[0035] The top of the vibrating screen 3 is provided with a cover 15, which is opened and closed by a door latch 17; A screen 16 is installed in the middle of the vibrating screen 3; Multiple sets of compressed air jet pipes 4 are installed at the bottom of the vibrating screen 3. The compressed air jet pipes 4 are installed on both sides of the vibrating screen 3 and are evenly arranged along the lower part of the screen 16.

[0036] like Figure 4 As shown, the compressed air jet pipe 4 is sealed to the compressed air pipeline 5 through the compressed air sealing telescopic hose 29, and the compressed air jet pipe 4 vibrates synchronously with the vibrating screen 3. The compressed air pipeline 5 is equipped with a filter 6, a shut-off valve 7, a pressure regulating valve 8, a pressure gauge 9 and a pulse valve 2 in sequence along the direction of compressed air flow; The pulse valve 2 can be connected to one or two (but not limited to) compressed air jet pipes 4. The pulse frequency is designed to be 0.5Hz~2.0Hz (but not limited to). During operation, all pulse valves 2 work synchronously. The pulse airflow pressure is adjustable from 0.1MPa to 0.6MPa (but not limited to).

[0037] As an alternative implementation, the compressed air jet pipe 4 sprays upwards, with the upper part of the compressed air jet pipe 4 being 10mm~30mm above the screen 16, and the lower part of the compressed air jet pipe 4 being no less than 300mm above the vibrating screen 3 tank; the horizontal spacing between the compressed air jet pipes is 8cm~20cm (but not limited to).

[0038] As an alternative implementation, the screening zones and the blowing zones of the compressed air jet pipe 4 on the vibrating screen 3 are distributed at intervals, that is, the screening zones, blowing zones, and screening zones are distributed sequentially.

[0039] like Figure 5 As shown, the mesh of the screen 16 is round, square, or rectangular, with a mesh size of 2cm to 5cm (but not limited to). After the loosened tobacco shreds are screened by the screen 16, they fall onto the trough of the vibrating screen 3 and are conveyed to the first discharge vibrating conveyor 21 through the screening material outlet 18 on the side of the vibrating screen 3. The remaining small portion of the clumped tobacco shreds is conveyed to the needle roller loosening machine 20 through the discharge port of the vibrating screen 3, and the needle roller loosening machine 20 completes the loosening of all the clumped tobacco shreds.

[0040] In this embodiment, as Figure 6 As shown, the needle roller loosening machine 20 is mounted on the needle roller loosening machine frame 25 and includes a left needle roller 26, a right needle roller 27 and a lower needle roller 28. The left needle roller 26 rotates clockwise, while the right needle roller 27 and the lower needle roller 28 rotate counterclockwise.

[0041] As an alternative implementation, the rotation speed of the left needle roller 26 is generally 10 rpm to 30 rpm (but not limited to). The speed of the lower needle roller 28 is generally 20 rpm to 40 rpm (but not limited to). The rotation speed of the right needle roller 27 is generally 30 rpm to 60 rpm (but not limited to); The gap between the teeth of each needle roller screening tooth is 0.5cm to 5cm (but not limited to).

[0042] The above system adopts a multi-stage pulsed airflow loosening mode to achieve flexible loosening of low-moisture clumps of tobacco, reduce breakage, and achieve high loosening efficiency, thus having good potential for widespread application.

[0043] Working principle: (1) Before working, adjust the compressed air pressure. In this embodiment, the compressed air pressure is adjusted to 0.2MPa, that is, adjust the pressure regulating valve 8 so that the pressure gauge 9 displays 0.2MPa.

[0044] The left needle roller speed is set to 15 rpm, the lower needle roller speed to 25 rpm, and the right needle roller speed to 35 rpm; the left needle roller rotates clockwise, and the lower and right needle rollers rotate counterclockwise; the gap between the needle roller screening teeth is 3.5 cm.

[0045] The pulse frequency of pulse valve 2 on the pulse vertical loosening machine is set to 0.6Hz; the pulse frequency of pulse valve 2 on the vibrating screen 3 is set to 1Hz.

[0046] (2) Open the feeding vibrating conveyor 10, the second discharging vibrating conveyor 22, the first discharging vibrating conveyor 21, the needle roller loosener 20, the feeding dust hood 11, and the discharging dust hood 19.

[0047] (3) The dried clumps of tobacco are evenly conveyed to the feed inlet of the pulse vertical loosening machine by the feeding vibration conveyor 10. When the control system detects the tobacco in the feeding vibration conveyor 10, after a certain delay (58 seconds in this embodiment), the control opens multiple pulse valves 2 on the compressed air pipeline 5. Pulse air is injected into the pulse air jet chambers on both sides of the pulse vertical loosening machine. The pulse air nozzle 12 of the left chamber blows the clumps of tobacco that are in free fall to the upper right through the pulse air jet hole 23 at a set angle (12° in this embodiment). The pulse air nozzle 12 of the right chamber blows the same clumps of tobacco to the upper left at the same angle, so as to achieve flexible loosening of the clumps of tobacco.

[0048] (4) After the tobacco is loosened by pulse vertically, it falls onto the vibrating screen 3 through the retractable sealing flexible connection 14. After being screened by the screen 16, the loosened tobacco falls onto the tank of the vibrating screen 3. The remaining clumps of tobacco are transported to the compressed air blowing area by the vibrating screen 3. The pulse airflow nozzle 12 sprays pulse airflow to loosen the clumps. The loosened tobacco is screened by the screen 16 again. The remaining clumps of tobacco are loosened by pulse airflow again until they are completely loosened.

[0049] Finally, the loose and completely shredded tobacco is conveyed by the vibrating screen 3 and then transported to the first discharge vibrating conveyor 21 through the side screening material outlet 18.

[0050] The vibrating screen 3 is equipped with a top cover 15, which is fixed by a door latch 17 to prevent tobacco from being sprayed outside the vibrating screen 3 during the loosening of the pulse airflow.

[0051] The compressed air jet pipe 4 is fixed on both sides of the vibrating screen 3 and is sealed to the compressed air pipeline 5 through the compressed air sealing telescopic hose 29. The compressed air jet pipe 4 vibrates synchronously with the vibrating screen 3.

[0052] (5) A small amount of clumped tobacco will remain at the discharge port of the vibrating screen 3. This part of the clumped tobacco is transported to the needle roller loosening machine 20, and the needle roller loosening machine 20 completes the loosening of all the clumped tobacco.

[0053] Specifically: Clumps of tobacco fall to the center of the needle roller loosening machine 20. The left needle roller 26 rotates clockwise and the lower needle roller 28 rotates counterclockwise. The two needle rollers rotate at the same speed. After being loosened, some of the clumps of tobacco fall through the middle of the two needle rollers on the left. The lower needle roller 28 rotates counterclockwise, and the right needle roller 27 rotates counterclockwise. The speed of the right needle roller 27 is greater than that of the lower needle roller 28. After the remaining clumps of tobacco are loosened, they fall through the middle of the two needle rollers on the right side. After being loosened, the tobacco shreds are conveyed to the next process via the second discharge vibrating conveyor 22 to completely loosen the clumps of tobacco shreds.

[0054] When a large amount of clumped tobacco is detected at the discharge port of the vibrating screen 3, the compressed air pressure can be appropriately increased or the pulse valve 2 blowing frequency can be reduced to improve the loosening efficiency of the clumped tobacco.

[0055] During the process of loosening the tobacco shreds, the feeding dust hood 11 and the discharging dust hood 19 work simultaneously, and the dust-laden airflow is transported to the dust collector through the dust hood for purification.

[0056] This embodiment proposes a multi-stage pulsed airflow loosening tobacco declumping system. It employs a multi-stage pulsed airflow dispersing mode and incorporates a needle roller loosening machine. Through the precise structural design and motion control of the needle roller loosening machine, it ensures that all clumps of tobacco are loosened. Its beneficial effects are as follows: 1. More thorough de-clumping and significantly reduced residual clumps: The multi-stage pulse airflow loosening mode, which combines flexible loosening with zoned airflow blowing by a vibrating screen and repeated screening and de-clumping, allows clumped tobacco to be subjected to the flexible action of pulse airflow multiple times, prolonging the airflow action time and improving the effect of breaking up tightly clumped tobacco. This effectively reduces the final residual clumps and meets the requirements of subsequent processing.

[0057] 2. Uniform force on tobacco shreds and significantly reduced breakage rate: The pulsed airflow in the two chambers of the pulse vertical loosening machine is sprayed upward at a certain angle, causing the clumps of tobacco shreds to be suspended and tumbling in the chamber. The force on all parts of the tobacco shreds is uniform and gentle, avoiding the problem of excessive local airflow impact in the cross-shaped impact mode of the existing technology. This significantly reduces the breakage rate of tobacco shreds and protects the integrity of the tobacco shreds.

[0058] 3. Reasonable process design and higher processing efficiency: The integrated vibrating screen realizes a closed-loop process of de-clumping, screening and re-de-clumping. The loosened tobacco can be separated in time and transported to the next process, while the unloose clumped tobacco continues to be de-clumped by pulse airflow, avoiding ineffective processing, reducing the load of subsequent mechanical loosening and improving the overall de-clumping processing efficiency.

[0059] 4. Superior tobacco quality, stronger processing stability, and ensure complete loosening of clumps: The needle roller loosening machine is used to finally loosen the remaining clumps of tobacco, significantly reducing the proportion and intensity of mechanical loosening, preserving the complete shape and length of the tobacco to the greatest extent, and improving the whole tobacco yield; at the same time, the structure and motion design of the needle roller loosening machine have been precisely optimized to achieve complete loosening of clumps of tobacco and eliminate residual clumps.

[0060] Specifically, the needle roller loosening machine 20 is installed on the needle roller loosening machine frame 25, including a left needle roller 26, a right needle roller 27, and a lower needle roller 28. Its movement mode and speed setting are scientific and reasonable. The left needle roller 26 rotates clockwise, while the right needle roller 27 and the lower needle roller 28 rotate counterclockwise. When the remaining small amount of clumped tobacco shreds after multi-stage pulse airflow treatment falls to the center position of the needle roller loosening machine 20, the left needle roller 26 and the lower needle roller 28 rotate in opposite directions at the same speed, forming a gentle and effective clamping and loosening effect on some of the clumped tobacco shreds. The loosened tobacco shreds fall through the middle of the two needle rollers on the left. At the same time, the lower needle roller 28 and the right needle roller 27 both rotate counterclockwise, and the right needle roller 27 rotates at a higher speed, which can form a stronger shearing and loosening effect on the remaining tighter clumps of tobacco shreds, ensuring that the clumps of tobacco shreds are completely broken up. The loosened tobacco shreds fall through the middle of the two needle rollers on the right. This precise structural and motion design avoids damage to the tobacco from excessive mechanical action, ensures that all residual clumps are loosened, and guarantees the consistency of tobacco unpacking, facilitating stable connection with subsequent tobacco processing steps and further improving the overall quality of cigarette processing.

[0061] 5. The system operates continuously and stably, and is suitable for industrial production: The feeding vibrating conveyor achieves uniform feeding of agglomerated tobacco shreds. After multi-stage deagglomeration and screening, the shredded tobacco shreds are continuously transported to the next process by the discharge vibrating conveyor. The entire system has a smooth process connection and stable operation, and can meet the needs of large-scale industrial tobacco production.

[0062] Example 2 This embodiment provides a method for de-clumping tobacco using a multi-stage pulsed airflow, employing the aforementioned multi-stage pulsed airflow de-clumping system, including: After drying and screening, the clumped tobacco shreds are evenly conveyed to the pulse vertical loosening machine by the feeding vibrating conveyor. Pulse airflow is injected into the pulse airflow injection chambers on both sides of the pulse vertical loosening machine and blows the clumped tobacco shreds at a set angle to achieve flexible loosening of the clumped tobacco shreds. The tobacco shreds loosened by the pulse vertical loosening machine fall onto the vibrating screen through the discharge port. After being screened by the screen, the loosened tobacco shreds fall onto the trough of the vibrating screen. The clumps of tobacco shreds continue to be unclumped and loosened in the compressed air blowing area of ​​the vibrating screen, and are screened and loosened again. The loosened tobacco shreds are then conveyed to the first discharge vibrating conveyor by the vibrating screen. The remaining clumps of tobacco conveyed by the vibrating screen are completely loosened by the needle roller loosener. After loosening, the tobacco is conveyed to the next process by the second discharge vibrating conveyor to complete the loosening of the clumps of tobacco.

[0063] 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 multi-stage pulsed airflow system for loosening and declumping tobacco shreds, characterized in that, include: The frame and the pulse vertical loosening machine mounted on the frame; The feed inlet of the pulse vertical loosening machine is connected to the feed vibrating conveyor, the discharge outlet of the pulse vertical loosening machine is connected to the inlet of the vibrating screen, the first outlet of the vibrating screen is connected to the first discharge vibrating conveyor, the second outlet is connected to the needle roller loosening machine, and the outlet of the needle roller loosening machine is connected to the second discharge vibrating conveyor. The pulse vertical loosening machine is provided with a pulse airflow injection chamber on each side, and each chamber is provided with multiple pulse airflow nozzles; The vibrating screen is equipped with a screen in the middle, and multiple sets of compressed air jet pipes are provided at the bottom of the screen. The needle roller loosening machine includes a left needle roller, a lower needle roller, and a right needle roller that mesh in sequence. The right needle roller and the lower needle roller rotate in the same direction, while the left needle roller rotates in the opposite direction.

2. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The pulse airflow nozzles in the pulse airflow injection chambers on both sides are symmetrically arranged, with consistent horizontal and vertical spacing between them, and the nozzle angles are adjustable.

3. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The distance between the topmost pulse airflow nozzle and the top of the pulse airflow injection chamber is no less than 300mm.

4. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The compressed air jet pipe is connected to the compressed air pipeline in a sealed manner, and the compressed air jet pipe vibrates synchronously with the vibrating screen.

5. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The compressed air jet pipe sprays air towards the screen, with the upper part of the compressed air jet pipe 10mm~30mm above the screen and the lower part of the compressed air jet pipe at least 300mm above the vibrating screen trough; the horizontal spacing between the compressed air jet pipes is 8cm~20cm.

6. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The screening zones and compressed air jetting zones on the vibrating screen are spaced apart.

7. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The left needle roller rotates clockwise, while the right needle roller and the lower needle roller rotate counterclockwise.

8. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The vibrating screen is equipped with a top cover, which is opened and closed by a door latch.

9. The multi-stage pulsed airflow loosening tobacco clump de-clumping system as described in claim 1, characterized in that, The tobacco shreds loosened by the pulse vertical loosening machine fall onto the vibrating screen. After being screened by the screen, the loosened tobacco shreds fall onto the trough of the vibrating screen. The clumps of tobacco shreds are further broken up and loosened by the compressed air jet pipe, and then screened and loosened again. The loosened tobacco shreds are conveyed to the first discharge vibrating conveyor through the first outlet of the vibrating screen. Finally, the remaining clumps of tobacco shreds are conveyed to the needle roller loosening machine through the second outlet of the vibrating screen.

10. A method for loosening and untangling tobacco shreds using a multi-stage pulsed airflow, characterized in that, The multi-stage pulsed airflow loosening tobacco declumping system according to any one of claims 1-9 comprises: After drying and screening, the clumped tobacco shreds are evenly conveyed to the pulse vertical loosening machine by the feeding vibrating conveyor. Pulse airflow is injected into the pulse airflow injection chambers on both sides of the pulse vertical loosening machine and blows the clumped tobacco shreds at a set angle to achieve flexible loosening of the clumped tobacco shreds. The tobacco shreds loosened by the pulse vertical loosening machine fall onto the vibrating screen through the discharge port. After being screened by the screen, the loosened tobacco shreds fall onto the trough of the vibrating screen. The clumps of tobacco shreds continue to be unclumped and loosened in the compressed air blowing area of ​​the vibrating screen, and are screened and loosened again. The loosened tobacco shreds are then conveyed to the first discharge vibrating conveyor by the vibrating screen. The remaining clumps of tobacco conveyed by the vibrating screen are completely loosened by the needle roller loosener. After loosening, the tobacco is conveyed to the next process by the second discharge vibrating conveyor to complete the loosening of the clumps of tobacco.

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