A material flow transfer control device and method

Abstract

The application discloses a kind of material flow control device and method, it is related to pneumatic pipeline conveying technical field, including pneumatic feeding pipe, the pneumatic feeding pipe two ends distribution setting is used for feeding and is used for the discharge pipe of tobacco for sending into roll packer, the circumferential outer wall of the pneumatic feeding pipe is provided with the purge assembly for avoiding residual tobacco in the pneumatic feeding pipe, the pneumatic feeding pipe includes straight pipe portion and elbow portion, the purge assembly is equidistant distribution at straight pipe portion, another purge assembly is arranged at the end of elbow portion, the purge assembly includes purge shell, the two ends of the purge shell are fixedly connected with the pneumatic feeding pipe by flange, rotating groove is opened in the circumferential inner wall of the purge shell.The material flow control device of the application meets the control needs of people in the logistics of tobacco, such as accurately removing residual tobacco, efficiently completing batch switching, controlling mixing risk and realizing multi-brand production.

Description

Technical Field

[0001] This invention relates to the field of pneumatic pipeline conveying technology, and more specifically, to a material flow control device and method. Background Technology

[0002] Integrated tobacco processing, cigarette making, and packaging is the mainstream model in modern cigarette manufacturing. In this process, long-distance transport of tobacco shreds from the processing workshop to the cigarette making and packaging units commonly employs pneumatic duct conveying systems. This system, with its advantages of high conveying efficiency, small footprint, and high degree of automation, has become the standard configuration for tobacco material flow in the industry.

[0003] With the diversification of consumer demand in the cigarette market, cigarette manufacturers generally adopt a multi-brand, multi-batch production model. A single tobacco processing line typically needs to simultaneously produce 10-12 regular brands and 2-3 high-end brands. This requires frequent switching between different brands and batches of tobacco using the same pneumatic conveying pipeline. Because tobacco products have extremely stringent requirements for consistent flavor, the composition and processing technology of different brands of tobacco vary significantly. Even trace amounts of blended tobacco can severely affect the quality of the finished cigarettes, leading to the scrapping of entire batches and causing huge economic losses for the company.

[0004] Currently, the industry primarily addresses the issue of material mixing during the conveying of multi-brand tobacco by using a single shared pipe combined with manual purging. Improvements such as overall purging, detachable and washable pipes, and dual-pipe switching have emerged, but none can simultaneously guarantee both residue removal quality and production switchover efficiency. The core drawbacks are: tobacco residue easily accumulates at pipe bends, making it difficult to remove; existing purging methods are either energy-intensive and incomplete in cleaning dead spots, or cumbersome to disassemble and reassemble, resulting in low efficiency; and manual operation relies on experience, leading to inconsistent cleaning standards. Consequently, the risk of material mixing always exists during tobacco conveying. Therefore, a material flow control device and method are urgently needed to solve these problems. Summary of the Invention

[0005] In view of the problems in the related technologies, the present invention proposes a material flow control device and method to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] The technical solution of this invention is implemented as follows: A material flow control device includes a pneumatic feeding pipe. At both ends of the pneumatic feeding pipe are respectively provided a feeding pipe for feeding tobacco and a discharge pipe for feeding tobacco into a rolling machine. The outer circumference of the pneumatic feeding pipe is provided with a purging assembly to prevent tobacco residue from remaining in the pneumatic feeding pipe. The pneumatic feeding pipe includes a straight pipe section and a curved pipe section. The purging assemblies are evenly distributed in the straight pipe section, and another purging assembly is provided at the end of the curved pipe section. The purging assembly includes a purging shell, both ends of which are fixedly connected to the pneumatic feed pipe via flanges. A rotating groove is formed on the inner circumference of the purging shell, and an annular cover is rotatably connected inside the rotating groove. The inner circumference of the annular cover is flush with the inner circumference of the pneumatic feed pipe. An annular groove is formed on the outer circumference of the annular cover, and an air supply ring cover is inserted into the annular groove. Rotating ring seats are fixedly connected to both outer walls of the air supply ring cover, and the annular cover is rotatably connected to the rotating ring seats. An air supply pipe is inserted into the outer circumference of the air supply ring cover. The inner circumference of the annular cover is fitted with first purgers that are evenly spaced and distributed in a circular pattern, and the interior of the purge housing is provided with a rotating assembly for driving the annular cover to rotate.

[0007] Preferably, the first purger includes a tapered tube communicating with the annular cover. One end of the tapered tube is provided with a throat, and the end of the throat away from the tapered tube is provided with a diffuser. The inner diameter of the throat is smaller than the inner diameters of the tapered tube and the diffuser. The inner diameter of the tapered tube gradually decreases along the direction close to the throat, and the inner diameter of the diffuser gradually increases along the direction away from the throat. The inner diameter of the end of the diffuser away from the throat is larger than the inner diameter of the end of the tapered tube away from the throat. One end of the diffuser is provided with a spherical shell, and a purge head is fixedly connected to the outer circumferential wall of the spherical shell.

[0008] Preferably, a flexible tube is fixedly connected to the outer circumferential wall of the spherical shell, and a second blower is fixedly connected to the other end of the flexible tube. The first blower is connected to the second blower through the flexible tube.

[0009] Preferably, both the first and second blowers are arc-shaped, and the bending direction of the first blower is opposite to that of the second blower, and the first and second blowers are staggered.

[0010] Preferably, the rotating assembly includes a motor fixedly connected to the outer circumferential wall of the purge housing, a first bevel gear fixedly connected to the output end of the motor, a second bevel gear meshing with the outer circumferential wall of the first bevel gear, a rotating column fixedly connected to the inner circumferential wall of the second bevel gear, a gear disk fixedly connected to the outer circumferential wall of the rotating column, and a gear ring fixedly connected to the outer circumferential wall of the annular cover, the gear ring meshing with the gear disk.

[0011] Preferably, the inner circumferential wall of the purge shell is provided with equally spaced circular mounting grooves, an annular seat is inserted into the inside of the mounting groove, an arc-shaped plate is fixedly connected to the outer circumferential wall of the annular seat, an equally spaced groove is provided on the outer circumferential wall of the arc-shaped plate, and an equally spaced protrusion is fixedly connected to the outer circumferential wall of the arc-shaped plate, the protrusions and the grooves are distributed in a wavy pattern on the outer circumferential wall of the arc-shaped plate.

[0012] Preferably, each of the arc-shaped plates is offset on the outer circumferential wall of the annular seat.

[0013] Preferably, a guide post is fixedly connected to the outer wall of the annular seat on the side away from the arc-shaped plate, and a threaded rod is rotatably connected to the outer wall of the annular seat on the side where the guide post is fixedly connected. The other ends of the threaded rod and the guide post both pass through the interior of the purge shell.

[0014] Preferably, a spring is fixedly connected to the outer circumference of the second purger, and the other end of the spring is fixedly connected to the outer circumference of the spherical shell, with the spring sleeved on the outside of the hose.

[0015] A material flow control method, applied to the material flow control device described in the above embodiments, includes the following steps: S1: Start the high-pressure blower at the end of the corresponding feeding tube and pneumatic feeding tube to uniformly transport the tobacco from the feeding tube through the pneumatic feeding tube to the discharge tube and into the rolling and packaging unit. During this process, the inner wall of the annular cover of the blowing component is flush with the inner wall of the pneumatic feeding tube. S2: After a single batch of tobacco shreds is conveyed, the high-pressure blower on the feeding side is stopped, and the automatic pipeline purging program is started; for the purging assembly in the bend section, the threaded rod is rotated in advance to move the annular seat and the arc plate forward to the preset blocking position; S3: The external air supply system introduces compressed air into the air supply pipe. The compressed air is evenly distributed to each of the first blowers through the air supply ring cover. After being accelerated by the Venturi structure, it forms a high-speed jet airflow. At the same time, part of the airflow enters the second blower through the hose to form a bidirectional cross-blowing. Then, the rotating component drives the ring cover to drive all the blowers to rotate 360° at a constant speed, forming a double helical blowing airflow that advances along the pipe axis. Meanwhile, when the second blower in the bend rotates, it hits the protrusion and groove of the arc plate in sequence. Under the action of the spring, it generates reciprocating swing and high-frequency vibration, realizing variable angle targeted blowing of the entire circumference of the bend. S4: After the preset purging time is reached, stop the gas supply and the operation of the rotating components. Rotate the threaded rod in the opposite direction to reset the arc plate of the bend to be flush with the inner wall of the pipe, and then start the next batch of tobacco conveying operation.

[0016] The beneficial effects of this invention are: This invention provides a material flow control device and method. Through a purge assembly, compressed air from an external air supply system enters the air supply ring through an air supply pipe. The compressed air is then evenly distributed to the first purgers, which are arranged in a circular pattern at equal intervals on the ring. Inside the first purgers, the airflow is accelerated by a Venturi structure consisting of a converging tube, a throat, and a diverging tube, forming a high-speed jet of airflow. This significantly improves the peeling force on the tobacco shreds adhering to the inner wall of the pipe. Simultaneously, part of the airflow enters the second purgers, which are arranged in a staggered manner with a bending direction opposite to that of the first purgers, through a flexible hose connected to a spherical shell. This forms a bidirectional, multi-angle purge coverage, preventing the purge assembly from creating numerous dead angles when cleaning the pneumatic feeding pipe.

[0017] This invention provides a material flow control device and method. Through a rotating component, the motor of the rotating component rotates by meshing the first and second bevel gears, driving the rotating column and gear disk to rotate. Then, through the gear ring, the annular cover rotates uniformly in the rotating groove of the purge shell, driving all purgers to rotate synchronously to achieve 360° full circumferential rotation. At this time, the first and second purgers, which are arranged in an arc shape and oppositely staggered, can form a double helical airflow in the pneumatic feeding pipe. The double helical airflow continuously advances along the pipe axis while generating a strong radial shear force, which can not only peel off the attached tobacco shreds on the inner wall of the pipe in all directions, but also fully agitate the suspended residues in the central area of ​​the pipe, thereby eliminating the airflow blind zone that exists in conventional straight-line purging and greatly improving the removal efficiency of tobacco residues.

[0018] This invention provides a material flow control device and method. Through the combined action of a purging assembly and a rotating assembly, the purging assembly, installed at the bend of a pneumatic feeding pipe, can be rotated by the operator after installation. The threaded rod drives the annular seat and the arc-shaped plate to move towards the purging assembly until they can no longer rotate. At this point, the forward-moving arc-shaped plate periodically obstructs the rotating second purging head. When the annular cover drives the second purging head to rotate at a constant speed, the second purging head sequentially impacts the wavy protrusions and grooves on the surface of the arc-shaped plate. Under the elastic action of the spring, this generates a large-amplitude reciprocating oscillation and stronger impact vibration, causing the spray angle of the purging head to change with the rotation. The process is dynamically changing, forming a variable-angle purging system covering the entire circumference of the bend. The first and second purgers, which are arranged in opposite arc shapes and staggered positions, can precisely target the two tobacco accumulation points at the top and bottom of the bend. Specifically, the high-speed airflow generated by the first purger, whose bending direction is consistent with the tobacco flow direction, is sprayed along the tangential direction on the outside of the bend, precisely impacting the main accumulation area formed by centrifugal force on the outside of the bend, peeling off the tightly compacted tobacco layers one by one. The second purger, whose bending direction is opposite, continuously sprays airflow into the inside of the bend and the upper and lower corners during the swinging process, specifically cleaning the inner dead corners and upper and lower edge accumulations that are difficult to reach by conventional purging. The two work together to form a three-dimensional purging system that attacks from the inside and outside and covers from top to bottom.

[0019] This invention provides a material flow control device and method. By staggering any arc-shaped plate on the outer circumference of the annular seat, a significant phase difference exists in the impact timing of each second purger as it rotates past the arc-shaped plate. This allows each second purger to generate independent reciprocating oscillations of varying amplitudes. Furthermore, the staggered arc-shaped plates cause the high-speed airflow to form multiple cross-flow vortices of different directions and intensities within the bend. These vortices intertwine and collide, further enhancing the scouring effect on the inner wall of the pipe. This effectively disperses and entrains the detached tobacco fragments into the main airflow, preventing secondary deposition of tobacco at the bend corner. This meets the control needs of precise removal of residual tobacco, efficient batch switching, risk management of mixing, and multi-brand production during the material flow of tobacco. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 For the present invention Figure 1 A magnified structural diagram of point A in the middle.

[0023] Figure 3 This is a schematic diagram of the overall half-sectional structure of the purging assembly of the present invention.

[0024] Figure 4 For the present invention Figure 3 A magnified structural diagram at point B in the middle.

[0025] Figure 5 For the present invention Figure 3 A magnified structural diagram at point C.

[0026] Figure 6 This is a schematic diagram of the overall cross-sectional end planar structure of the purging assembly of the present invention.

[0027] Figure 7 This is a three-dimensional cross-sectional view of the end structure of the purging assembly of the present invention.

[0028] Figure 8 For the present invention Figure 7 A magnified structural diagram at point D.

[0029] In the picture: 1. Pneumatic feed tube; 2. Wire feed tube; 3. Discharge tube; 4. Blowing shell; 5. Air supply tube; 6. Motor; 7. Threaded rod; 8. Guide column; 9. Flange; 10. First bevel gear; 11. Second bevel gear; 12. Gear disk; 13. Rotating column; 14. Gear ring; 15. Annular cover; 16. Air supply ring cover; 17. Rotating ring seat; 18. Rotating groove; 19. First blower; 1901. Converging tube; 1902. Throat; 1903. Diverging tube; 1904. Spherical shell; 1905. Blowing head; 20. Second blower; 21. Hose; 22. Spring; 23. Annular seat; 24. Arc plate; 25. Mounting groove; 26. Protrusion; 27. Groove. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0031] Please see Figures 1-8 A material flow control device includes a pneumatic feeding pipe 1. The two ends of the pneumatic feeding pipe 1 are respectively provided with a feeding pipe 2 for feeding tobacco and a discharge pipe 3 for feeding tobacco into a rolling machine. The outer circumference of the pneumatic feeding pipe 1 is provided with a purging component to prevent tobacco residue in the pneumatic feeding pipe 1. The pneumatic feeding pipe 1 includes a straight pipe section and a curved pipe section. The purging components are evenly distributed in the straight pipe section, and another purging component is provided at the end of the curved pipe section. The purging assembly includes a purging shell 4, both ends of which are fixedly connected to the pneumatic feed pipe 1 via flanges 9. A rotating groove 18 is provided on the inner circumference of the purging shell 4. An annular cover 15 is rotatably connected inside the rotating groove 18. The inner circumference of the annular cover 15 is flush with the inner circumference of the pneumatic feed pipe 1. An annular groove is provided on the outer circumference of the annular cover 15. An air supply ring cover 16 is inserted into the annular groove. Rotating ring seats 17 are fixedly connected to both outer walls of the air supply ring cover 16. The annular cover 15 is rotatably connected to the rotating ring seats 17. An air supply pipe 5 is inserted into the outer circumference of the air supply ring cover 16. The inner circumference of the annular cover 15 is fitted with first purgers 19 that are evenly spaced and distributed in a circular pattern. The purge shell 4 is equipped with a rotating component for driving the annular cover 15 to rotate. This meets the control needs of people for precise removal of residual tobacco shreds, efficient batch switching, risk management of mixing materials, and multi-brand production during the material flow of tobacco shreds.

[0032] Furthermore, the first purger 19 includes a converging tube 1901 connected to the annular cover 15. One end of the converging tube 1901 is provided with a throat 1902, and the end of the throat 1902 away from the converging tube 1901 is provided with a diverging tube 1903. The inner diameter of the throat 1902 is smaller than the inner diameters of the converging tube 1901 and the diverging tube 1903. The inner diameter of the converging tube 1901 gradually decreases along the direction close to the throat 1902, and the inner diameter of the diverging tube 1903 gradually increases along the direction away from the throat 1902. The inner diameter of the end of the diverging tube 1903 away from the throat 1902 is larger than the inner diameter of the end of the converging tube 1901 away from the throat 1902. One end of 903 is provided with a spherical shell 1904, and a purge head 1905 is fixedly connected to the outer circumference of the spherical shell 1904. The airflow passes through the Venturi structure composed of the converging tube 1901, the throat tube 1902, and the expanding tube 1903 in the first purger 19 and is accelerated to form a high-speed jet airflow, which greatly improves the peeling force on the tobacco attached to the inner wall of the pipe. At the same time, part of the airflow enters the second purger 20 through the flexible hose 21 connected to the spherical shell 1904 and is arranged in a staggered manner with the bending direction opposite to that of the first purger 19, forming a bidirectional cross-angle purge coverage, avoiding the generation of a large number of dead corners when the purge assembly cleans the pneumatic feeding pipe 1.

[0033] Furthermore, a flexible hose 21 is fixedly connected to the outer circumference of the spherical shell 1904, and a second blower 20 is fixedly connected to the other end of the flexible hose 21. The first blower 19 is connected to the second blower 20 through the flexible hose 21.

[0034] Furthermore, both the first blower 19 and the second blower 20 are arc-shaped, and the bending direction of the first blower 19 is opposite to that of the second blower 20. The first blower 19 and the second blower 20 are staggered. The arc-shaped and oppositely staggered arrangement of the first blower 19 and the second blower 20 can accurately target and blow the two tobacco accumulation points at the top and bottom of the bend. That is, the high-speed airflow generated by the first blower 19, whose bending direction is consistent with the tobacco flow direction, is sprayed along the tangential direction on the outside of the bend, accurately impacting the main accumulation area formed by centrifugal force on the outside of the bend, peeling off the tightly compacted tobacco accumulation layer by layer. The second blower 20, whose bending direction is opposite, continuously sprays airflow into the inside of the bend and the upper and lower corners during the swinging process, specifically cleaning the inner dead corners and upper and lower edge accumulations that are difficult to reach by conventional blowing. The two work together to form a three-dimensional blowing system that attacks from the inside and outside and covers from the top and bottom.

[0035] Furthermore, the rotating assembly includes a motor 6 fixedly connected to the outer circumferential wall of the purge housing 4. A first bevel gear 10 is fixedly connected to the output end of the motor 6. A second bevel gear 11 meshes with the outer circumferential wall of the first bevel gear 10. A rotating column 13 is fixedly connected to the inner circumferential wall of the second bevel gear 11. A gear disk 12 is fixedly connected to the outer circumferential wall of the rotating column 13. A gear ring 14 is fixedly connected to the outer circumferential wall of the annular cover 15. The gear ring 14 meshes with the gear disk 12. The motor 6 of the rotating assembly reverses direction through the meshing of the first bevel gear 10 and the second bevel gear 11, driving the rotating column 13 and the gear disk 12 to rotate. The gear ring 14 drives the annular cover 15 to rotate at a constant speed in the rotating groove 18 of the purge shell 4, causing all the purgers to rotate synchronously to achieve 360° full circumferential rotation. At this time, the first purger 19 and the second purger 20, which are arranged in an arc shape and oppositely staggered, can form a double helical airflow in the pneumatic feeding pipe 1. The double helical airflow continuously advances along the pipe axis and generates a strong radial shear force, which can not only peel off the attached tobacco shreds on the inner wall of the pipe in all directions, but also fully agitate the suspended residues in the central area of ​​the pipe, thereby eliminating the airflow blind zone that exists in conventional straight-line purging and greatly improving the removal efficiency of tobacco residues.

[0036] Furthermore, each arc-shaped plate 24 is staggered on the outer circumference of the annular seat 23, so that there is a significant phase difference in the impact timing when each second purger 20 rotates past the arc-shaped plate 24. This allows each second purger 20 to generate independent reciprocating oscillations of different amplitudes. In addition, the staggered arc-shaped plates 24 will also cause the high-speed airflow to form multiple cross-flow vortices with different directions and intensities in the bend. These vortices intertwine and collide with each other, further enhancing the scouring effect on the inner wall of the pipe. This can fully disperse the detached tobacco fragments and entrain them into the main airflow, effectively preventing the tobacco from being deposited again at the bend corner.

[0037] Furthermore, a guide post 8 is fixedly connected to the outer wall of the annular seat 23 on the side away from the arc plate 24. A threaded rod 7 is rotatably connected to the outer wall of the annular seat 23 on the side where the guide post 8 is fixedly connected. The other ends of the threaded rod 7 and the guide post 8 both pass through the inside of the purge housing 4. The inner circumference of the purge housing 4 is provided with equally spaced circular mounting grooves 25. The annular seat 23 is inserted into the inside of the mounting grooves 25. An arc plate 24 is fixedly connected to the outer circumference of the annular seat 23. An equally spaced groove 27 is provided on the outer circumference of the arc plate 24. An equally spaced protrusions 26 are fixedly connected to the outer circumference of the arc plate 24. The protrusions 26 and grooves 27 are distributed in a wavy pattern on the outer circumference of the arc plate 24. For the purge assembly installed at the bend of the pneumatic feed pipe 1, the operator can rotate the threaded rod after the purge assembly is installed. Rod 7, through threaded rod 7, can drive the annular seat 23 and the arc plate 24 to move in the direction close to the purging assembly until they can no longer rotate. At this time, the forward-moving arc plate 24 can periodically block the rotating second purging device 20. When the annular cover 15 drives the second purging device 20 to rotate at a constant speed, the second purging device 20 will hit the wavy protrusions 26 and grooves 27 on the surface of the arc plate 24 in sequence. A spring 22 is fixedly connected to the outer circumference of the second purging device 20. The other end of the spring 22 is fixedly connected to the outer circumference of the spherical shell 1904. The spring 22 is sleeved on the outside of the hose 21. Under the elastic action of the spring 22, a large-amplitude reciprocating swing and stronger impact vibration are generated, so that the spray angle of the purging head 1905 changes dynamically with the rotation process, forming a variable angle purging that covers the entire circumference of the bend.

[0038] A material flow control method, applied to a material flow control device in the above embodiments, includes the following steps: Step 1: Start the high-pressure blower at the end of the corresponding feeding tube 2 and the pneumatic feeding tube 1 to uniformly transport the tobacco from the feeding tube 2 through the pneumatic feeding tube 1 to the discharge tube 3 and into the rolling and packaging unit. During this process, the inner wall of the annular cover 15 of the blowing component is flush with the inner wall of the pneumatic feeding tube 1. Step 2: After a single batch of tobacco shreds is conveyed, stop the high-pressure blower on the feeding side and start the automatic purging program of the pipeline; for the purging assembly of the bend section, pre-rotate the threaded rod 7 to drive the annular seat 23 and the arc plate 24 forward to the preset blocking position; Step 3: The external air supply system introduces compressed air into the air supply pipe 5. The compressed air is evenly distributed to each of the first blowers 19 through the air supply ring cover 16. After being accelerated by the Venturi structure, it forms a high-speed jet airflow. At the same time, part of the airflow enters the second blower 20 through the hose 21 to form a bidirectional cross-blowing. Then, the rotating component drives the ring cover 15 to drive all the blowers to rotate 360° at a constant speed, forming a double-helix blower airflow that advances along the pipe axis. Meanwhile, when the second blower 20 in the bend rotates, it hits the protrusion 26 and the groove 27 of the arc plate 24 in sequence. Under the action of the spring 22, it generates reciprocating swing and high-frequency vibration, realizing variable angle targeted blowing of the entire circumference of the bend. Step 4: After the preset purging time is reached, stop the gas supply and the operation of the rotating components. Rotate the threaded rod 7 in the opposite direction to reset the arc plate 24 of the bend section to be flush with the inner wall of the pipe, and then start the next batch of tobacco conveying operation.

[0039] In summary, with the help of the above-mentioned technical solution of the present invention, when in use, the tobacco shreds are conveyed from the corresponding feeding pipe 2 to the pneumatic feeding pipe 1 by a high-pressure blower. At the same time, the high-pressure blower at one end of the pneumatic feeding pipe 1 is started (it should be noted that the high-pressure blower is a prior art well known to those skilled in the art, so it is not shown in the drawings of the specification). The high-pressure blower can convey the tobacco shreds entering the pneumatic feeding pipe 1 to the discharge pipe 3 at a uniform speed along the pipe, and finally send them to the rolling and packaging unit to complete the subsequent processing. During this process, the inner wall of the annular cover 15 of the blowing component is completely flush with the inner wall of the pneumatic feeding pipe 1, without any protrusions or depressions, so it will not obstruct the flow of tobacco shreds, nor will it cause the tobacco shreds to break, effectively ensuring the smoothness of tobacco shred conveying and the integrity of the tobacco shred structure; When a single batch of tobacco is delivered and a brand or batch needs to be switched, the high-pressure blower on one side of the tobacco feeding tube 2 of that batch stops feeding and starts the automatic pipe cleaning program. At this time, the external air supply system will send compressed air into the air supply ring cover 16 through the air supply pipe 5. The compressed air is then evenly distributed to the first cleaners 19, which are distributed in a circular and equally spaced manner on the ring cover 15. The airflow passes through the Venturi structure composed of the tapered tube 1901, the throat tube 1902, and the diffuser tube 1903 in the first cleaner 19 and is accelerated to form a high-speed jet airflow, which greatly improves the peeling force on the tobacco attached to the inner wall of the pipe. At the same time, part of the airflow enters the second cleaner 20, which is arranged in a staggered manner with the bending direction opposite to that of the first cleaner 19, through the flexible hose 21 connected to the spherical shell 1904. This forms a bidirectional, cross-directional, multi-angle cleaning coverage, which avoids the cleaning components generating a large number of dead corners when cleaning the pneumatic feeding tube 1. Meanwhile, the motor 6 of the rotating component drives the rotating column 13 and gear disk 12 to rotate through the meshing and reversal of the first bevel gear 10 and the second bevel gear 11. Then, through the gear ring 14, it drives the annular cover 15 to rotate at a constant speed in the rotating groove 18 of the blowing shell 4, driving all the blowers to rotate synchronously to achieve 360° full circumferential rotation. At this time, the first blower 19 and the second blower 20, which are arranged in an arc shape and oppositely staggered, can form a double spiral airflow in the pneumatic feeding pipe 1. The double spiral airflow continuously advances along the pipe axis while generating a strong radial shear force, which can not only peel off the attached tobacco shreds on the inner wall of the pipe in all directions, but also fully agitate the suspended residues in the central area of ​​the pipe, thereby eliminating the airflow blind zone that exists in conventional straight-line blowing and greatly improving the removal efficiency of tobacco residues. For the purging assembly installed at the bend of the pneumatic feed pipe 1, after installation, the operator can rotate the threaded rod 7. The threaded rod 7 drives the annular seat 23 and the arc-shaped plate 24 to move towards the purging assembly until they can no longer rotate. At this point, the forward-moving arc-shaped plate 24 periodically obstructs the rotating second purging device 20. When the annular cover 15 drives the second purging device 20 to rotate at a constant speed, the second purging device 20 will sequentially impact the wavy protrusions 26 and grooves 27 on the surface of the arc-shaped plate 24. Under the elastic action of the spring 22, this generates a large-amplitude reciprocating oscillation and stronger impact vibration, causing the spray angle of the purging head 1905 to dynamically change with the rotation process, forming... The variable-angle blowing system covers the entire circumference of the bend, while the first and second blowers 19 and 20, which are arranged in opposite arc shapes and staggered in opposite directions, can precisely target the two tobacco accumulation points at the top and bottom of the bend. Specifically, the high-speed airflow generated by the first blower 19, whose bending direction is consistent with the tobacco flow direction, is sprayed along the tangential direction of the outer side of the bend, precisely impacting the main accumulation area formed by centrifugal force on the outer side of the bend, peeling off the tightly compacted tobacco layers one by one; the second blower 20, whose bending direction is opposite, continuously sprays airflow into the inner side of the bend and the upper and lower corners during the swinging process, specifically cleaning the inner dead corners and upper and lower edge accumulations that are difficult to reach by conventional blowing. The two work together to form a three-dimensional blowing system that attacks from the inside and outside and covers from top to bottom. Meanwhile, each arc-shaped plate 24 is staggered on the outer circumference of the annular seat 23, resulting in a significant phase difference in the impact timing when each second purger 20 rotates past the arc-shaped plate 24. This allows each second purger 20 to generate independent reciprocating oscillations of different amplitudes. In addition, the staggered arc-shaped plates 24 cause the high-speed airflow to form multiple cross-flow vortices of different directions and intensities within the bend. These vortices intertwine and collide, further enhancing the scouring effect on the inner wall of the pipe. This effectively disperses the detached tobacco fragments and entrains them into the main airflow, preventing secondary deposition of tobacco at the bend corner. This meets the control needs of precise removal of residual tobacco, efficient batch switching, risk management of mixing, and multi-brand production during the material flow of tobacco.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A material flow control device, comprising a pneumatic feeding pipe (1), characterized in that, The pneumatic feeding pipe (1) is provided with a feeding pipe (2) for feeding and a discharge pipe (3) for feeding tobacco into the rolling machine at both ends. The outer circumference of the pneumatic feeding pipe (1) is provided with a purging component to prevent tobacco residue in the pneumatic feeding pipe (1). The pneumatic feeding pipe (1) includes a straight pipe section and a curved pipe section. The purging components are evenly distributed in the straight pipe section, and another purging component is provided at the end of the curved pipe section. The purging assembly includes a purging shell (4), both ends of which are fixedly connected to the pneumatic feeding pipe (1) via flanges (9). A rotating groove (18) is provided on the inner circumference of the purging shell (4). An annular cover (15) is rotatably connected inside the rotating groove (18). The inner circumference of the annular cover (15) is flush with the inner circumference of the pneumatic feeding pipe (1). An annular groove is provided on the outer circumference of the annular cover (15). An air supply ring cover (16) is inserted into the annular groove. Rotating ring seats (17) are fixedly connected to both outer walls of the air supply ring cover (16). The annular cover (15) is rotatably connected to the rotating ring seats (17). An air supply pipe (5) is inserted into the outer circumference of the air supply ring cover (16). The inner circumference of the annular cover (15) is fitted with first purgers (19) that are evenly spaced and distributed in a circular pattern. The inside of the purge shell (4) is provided with a rotating component for driving the annular cover (15) to rotate.

2. The material flow control device according to claim 1, characterized in that, The first purger (19) includes a tapered tube (1901) communicating with the annular cover (15). One end of the tapered tube (1901) is provided with a throat (1902), and the end of the throat (1902) away from the tapered tube (1901) is provided with a dilator (1903). The inner diameter of the throat (1902) is smaller than the inner diameters of the tapered tube (1901) and the dilator (1903). The inner diameter of the tapered tube (1901) is closer to the throat. The diameter of the diffuser (1902) gradually decreases in the direction away from the throat (1902), and the inner diameter of the diffuser (1903) gradually increases in the direction away from the throat (1902). The inner diameter of the end of the diffuser (1903) away from the throat (1902) is larger than the inner diameter of the end of the converging tube (1901) away from the throat (1902). A spherical shell (1904) is provided at one end of the diffuser (1903), and a purge head (1905) is fixedly connected to the outer circumferential wall of the spherical shell (1904).

3. The material flow control device according to claim 2, characterized in that, A flexible tube (21) is fixedly connected to the outer circumference of the spherical shell (1904), and a second blower (20) is fixedly connected to the other end of the flexible tube (21). The first blower (19) is connected to the second blower (20) through the flexible tube (21).

4. The material flow control device according to claim 3, characterized in that, Both the first blower (19) and the second blower (20) are arc-shaped, and the bending direction of the first blower (19) is opposite to that of the second blower (20). The first blower (19) and the second blower (20) are misaligned.

5. A material flow control device according to claim 4, characterized in that, The rotating assembly includes a motor (6) fixedly connected to the outer circumferential wall of the purge housing (4). The output end of the motor (6) is fixedly connected to a first bevel gear (10). The outer circumferential wall of the first bevel gear (10) meshes with a second bevel gear (11). The inner circumferential wall of the second bevel gear (11) is fixedly connected to a rotating column (13). The outer circumferential wall of the rotating column (13) is fixedly connected to a gear disk (12). The outer circumferential wall of the annular cover (15) is fixedly connected to a gear ring (14). The gear ring (14) meshes with the gear disk (12).

6. The material flow control device according to claim 5, characterized in that, The inner circumferential wall of the purge shell (4) is provided with equally spaced circular mounting grooves (25), and an annular seat (23) is inserted into the inside of the mounting grooves (25). An arc plate (24) is fixedly connected to the outer circumferential wall of the annular seat (23). An equally spaced groove (27) is provided on the outer circumferential wall of the arc plate (24). An equally spaced protrusions (26) are fixedly connected to the outer circumferential wall of the arc plate (24). The protrusions (26) and the grooves (27) are distributed in a wave-like pattern on the outer circumferential wall of the arc plate (24).

7. A material flow control device according to claim 6, characterized in that, Each of the arc-shaped plates (24) is offset on the outer circumferential wall of the annular seat (23).

8. A material flow control device according to claim 7, characterized in that, A guide post (8) is fixedly connected to the outer wall of the annular seat (23) away from the arc plate (24). A threaded rod (7) is rotatably connected to the outer wall of the annular seat (23) on the side where the guide post (8) is fixedly connected. The other ends of the threaded rod (7) and the guide post (8) both pass through the inside of the purge shell (4).

9. A material flow control device according to claim 8, characterized in that, A spring (22) is fixedly connected to the outer circumference of the second blower (20), and the other end of the spring (22) is fixedly connected to the outer circumference of the spherical shell (1904). The spring (22) is sleeved on the outside of the hose (21).

10. A material flow control method, applied to the material flow control device according to claim 9, characterized in that, Includes the following steps: S1: Start the high-pressure blower at the end of the corresponding feeding tube (2) and pneumatic feeding tube (1) to uniformly transport the tobacco from the feeding tube (2) through the pneumatic feeding tube (1) to the discharge tube (3) and into the rolling and packaging unit. During this process, the inner wall of the ring cover (15) of the blowing component is flush with the inner wall of the pneumatic feeding tube (1). S2: After a single batch of tobacco shreds is delivered, the high-pressure blower on the feeding side is stopped and the automatic purging program of the pipeline is started; for the purging assembly of the bend section, the threaded rod (7) is rotated in advance to drive the annular seat (23) and the arc plate (24) to move forward to the preset blocking position; S3: The external air supply system introduces compressed air into the air supply pipe (5). The compressed air is evenly distributed to each of the first blowers (19) through the air supply ring cover (16). After being accelerated by the Venturi structure, it forms a high-speed jet airflow. At the same time, part of the airflow enters the second blower (20) through the hose (21) to form a bidirectional cross-blowing. Then, the rotating component drives the ring cover (15) to drive all the blowers to rotate at a constant speed of 360°, forming a double-helix blower airflow that advances along the pipe axis. Meanwhile, when the second blower (20) of the bend rotates, it hits the protrusion (26) and groove (27) of the arc plate (24) in sequence. Under the action of the spring (22), it generates reciprocating swing and high-frequency vibration, realizing variable angle targeted blower of the entire circumference of the bend. S4: After the preset purging time is reached, stop the gas supply and the operation of the rotating components. Rotate the threaded rod (7) in the opposite direction to reset the arc plate (24) of the bend to be flush with the inner wall of the pipe, and then start the next batch of tobacco conveying operation.

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