A drum-type pulsed air deagglomerator for tobacco and method

Abstract

The present application relates to the technical field of tobacco processing, and particularly relates to a drum-type pulse air flow loose cluster tobacco device and method and application. The device comprises a drum loosening machine and a spraying system. The drum loosening machine comprises a drum and a sieve drum, the sieve drum is arranged in the drum and rotates together with the drum, and a material scraping plate is arranged on the inner wall of the sieve drum. The spraying system comprises a loosening spray pipe, the loosening spray pipe is arranged in the core of the sieve drum, a nozzle is arranged on the loosening spray pipe, and the nozzle is arranged on the loosening spray pipe in a region corresponding to the falling trajectory of the tobacco thrown by the material scraping plate. The present application adopts a method for flexibly loosening and clustering tobacco by pulse air flow, and does not mechanically loosen and physically scatter the material, so that the material is less crushed, the loosening effect is better, and the efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing technology, and in particular to a drum-type pulsed airflow device, method and application for loosening and clumping tobacco shreds. Background Technology

[0002] In the tobacco processing industry, tobacco shreds dried by airflow drying or drum drying have a low moisture content, usually around 12%, and are prone to clumping. The moisture inside clumped tobacco shreds is not easily dissipated, which can easily lead to yellow spots in subsequent processing. At the same time, the stems and stalks in clumped tobacco shreds are difficult to remove effectively, which can lead to an increase in the amount of stems and stalks removed by the cigarette rolling machine. This can result in the wrong removal of normal tobacco shreds, causing waste.

[0003] To handle clumped tobacco, the industry currently mostly uses mechanical loosening methods, which involve forcibly breaking up the clumps using physical breaking devices. These devices typically rely on the impact and compression between rotating components and the tobacco to break up the clumps. However, because the tobacco becomes more brittle after drying, the rate of breakage during mechanical loosening is high, leading to a decrease in the yield of usable tobacco and a less than ideal loosening effect. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a drum-type pulse airflow loosening and clump-forming tobacco device. This device uses pulse airflow to flexibly loosen and clump-forming tobacco without mechanical loosening or physical dispersal, resulting in less material breakage, better loosening effect, and higher efficiency.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions: In a first aspect, embodiments of the present invention provide a drum-type pulse airflow loosening device for clumped tobacco, comprising: a drum loosening machine and a blowing system; the drum loosening machine includes a drum and a screen cylinder, the screen cylinder being disposed inside the drum and rotating together with the drum, and a lifting plate being disposed on the inner wall of the screen cylinder; the blowing system includes a loosening nozzle, the loosening nozzle being disposed in the core of the screen cylinder, and a nozzle being provided on the loosening nozzle, the nozzle being disposed in an area on the loosening nozzle corresponding to the falling trajectory of the tobacco shreds thrown by the lifting plate.

[0006] As a further technical solution, the area covers a fan-shaped range extending forward from the throwing starting point along the rotation direction of the drum cross-section from 0° to 90°.

[0007] As a further technical solution, the spraying system also includes a cleaning spray pipe, which is also set in the core of the screen cylinder and arranged parallel to the loosening spray pipe. The cleaning spray pipe is provided with nozzles, which are set on the cleaning spray pipe to correspond to the cross-section of the drum, covering a fan-shaped range extending forward from the starting point of the scattering along the rotation direction of the drum from 90° to 180°.

[0008] As a further technical solution, it also includes a frame, a feeding vibrating conveyor, a discharging vibrating conveyor, a feed inlet dust hood, and a discharge outlet dust hood; the drum loosener is installed on the frame, the feeding vibrating conveyor is connected to the feed inlet of the drum loosener, the discharging vibrating conveyor is connected to the discharge outlet of the drum loosener, the feed inlet dust hood is set at the feed inlet, and the discharge outlet dust hood is set at the discharge outlet.

[0009] As a further technical solution, the drum loosening machine also includes a feed hood, a feed inlet support hood, a discharge outlet support hood, a discharge hood, and a drive wheel; the drum is installed on the feed inlet support hood and the discharge outlet support hood, and is driven by the drive wheel; the feed hood is located at the feed inlet, and the discharge hood is located at the discharge outlet.

[0010] As a further technical solution, the screen cylinder is installed inside the drum via a support rod.

[0011] As a further technical solution, the jetting system also includes a compressed air pipe, a pulse valve, a pressure gauge, a pressure regulating valve, a shut-off valve, and a filter valve; the pulse valve, pressure gauge, pressure regulating valve, shut-off valve, and filter valve are installed on the compressed air pipe, and the loosening nozzle and the cleaning nozzle are each connected to a set of compressed air pipes.

[0012] As a further technical solution, an plexiglass window is installed on the discharge hood.

[0013] Secondly, embodiments of the present invention also provide a method for loosening and clumping tobacco using a roller-type pulsed airflow, comprising the following steps: After the clumps of tobacco are spread out thinly, they are fed into the sieve cylinder. The drive drum and the sieve cylinder set inside the drum rotate together. The clumps of tobacco are picked up and scattered by the lifting plates on the inner wall of the sieve cylinder. A pulsed airflow is blown onto the scattered clumps of tobacco to break them up; Loose tobacco shreds pass through the sieve cylinder and fall onto the inner wall of the drum, where they are then sieved. Clumps of tobacco shreds that are not loosened are then scattered and pulsed airflow is sprayed on them.

[0014] As a further technical solution, pulsed airflow is sprayed onto the inner wall of the screen cylinder to clean the mesh holes on the inner wall of the screen cylinder.

[0015] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: In this invention, during the loosening of tobacco shreds, the lifting plate lifts clumps of tobacco shreds as the screen cylinder rotates. Once the tobacco shreds reach a certain height, they are scattered and fall due to gravity, forming a tobacco waterfall. The nozzles on the loosening nozzles are positioned directly over this falling trajectory area, allowing the pulsed airflow to directly impact the dispersed clumps of tobacco shreds. Compared to the mechanical loosening methods mentioned in the prior art, this solution uses non-contact airflow impact, avoiding the breakage problem caused by physical dispersal. Simultaneously, because the pulsed airflow is intermittent, it saves compressed air compared to continuous airflow, and the instantaneous kinetic energy generated by the pulsed impact makes it easier to separate the clumps of tobacco shreds from their bonding surfaces. The screen cylinder and the drum rotate synchronously; the loosened tobacco shreds pass through the screen cylinder and fall onto the inner wall of the drum, while the unloosened clumps of tobacco shreds are retained by the screen cylinder and can be impacted by the airflow again, preventing the already loosened tobacco shreds from being repeatedly impacted and broken. This device, through the combination of flexible loosening with pulsed airflow and screen cylinder sieving, reduces the tobacco breakage rate while loosening clumps of tobacco shreds.

[0016] Advantages of additional aspects of the invention will be set forth 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

[0017] 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. The drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the dimensions or spacing between the components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0018] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention; Figure 2 This is the left side view of AA provided in the embodiment of the present invention; Figure 3 This is a BB cross-sectional view provided in an embodiment of the present invention; Figure 4 This is a CC partial view provided in an embodiment of the present invention; Figure 5 This is a partial view of DD provided in an embodiment of the present invention; In the diagram: 1. Feeding vibrating conveyor; 2. Feed inlet dust hood; 3. Feed hood; 4. Feed inlet support hood; 5. Drum; 6. Loosening nozzle; 7. Discharge outlet support hood; 8. Discharge hood; 9. Compressed air pipe; 10. Discharge vibrating conveyor; 11. Pulse valve; 12. Pressure gauge; 13. Pressure regulating valve; 14. Shut-off valve; 15. Filter valve; 16. Frame; 17. Drive wheel; 18. Cleaning nozzle; 19. Support rod; 20. Material lifting plate; 21. Screen cylinder; 22. Discharge outlet dust hood; 23. Acrylic window; Detailed Implementation To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0019] Generally speaking, the terms "comprising" and "including" only indicate that the steps and elements are explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements.

[0020] Example 1 To loosen and disperse clumps of tobacco with low moisture content and significantly reduce breakage, this embodiment provides a drum-type pulse airflow device for loosening clumps of tobacco. The drum-type pulse airflow device adopts a gentle loosening mode with pulse airflow. The clumps of tobacco are scattered by the material lifting plate inside the drum, and the pulse airflow is used to loosen them. This method opens up the clumps of tobacco without mechanical unclogging or physical dispersal, resulting in lower breakage and higher loosening efficiency, and has significant value for promotion and application.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the device includes a drum loosening machine and a jet blowing system. The drum loosening machine further includes a drum 5 and a screen cylinder 21. The screen cylinder 21 is disposed inside the drum 5 and the two rotate together. A lifting plate 20 is disposed on the inner wall of the screen cylinder 21. The jet blowing system includes a loosening nozzle 6, which is disposed at the core of the screen cylinder 21. The loosening nozzle 6 has nozzles, which are disposed in the area corresponding to the falling trajectory of the tobacco shreds thrown by the lifting plate 20.

[0022] The core refers to the area near the central axis of the screen cylinder 21, and the loosening spray pipe 6 extends along the length of the screen cylinder 21. The material-lifting plates are installed on the inner wall of the screen cylinder, and multiple sets can be installed, for example, 8 to 16 sets, either as a whole or in sections. The mesh of the screen cylinder can be circular, rectangular, triangular, etc., and the mesh size can be 2cm to 5cm.

[0023] As the screen cylinder 21 rotates, the lifting plate 20 lifts up clumps of tobacco. Once the tobacco reaches a certain height, it falls due to gravity, forming a tobacco waterfall. The nozzle on the loosening nozzle 6 is positioned directly over this falling trajectory area, allowing the pulsed airflow to directly impact the dispersed clumps of tobacco. Compared to the mechanical loosening methods mentioned in the background technology, this solution uses non-contact airflow impact, avoiding the breakage problem caused by physical dispersal. Simultaneously, because the pulsed airflow is intermittent, it saves compressed air compared to continuous airflow, and the instantaneous kinetic energy generated by the pulsed impact makes it easier to separate the clumps of tobacco from the bonding surface. The screen cylinder 21 rotates synchronously with the drum 5. The loosened tobacco passes through the screen cylinder 21 and falls onto the inner wall of the drum 5, while the unloosened clumps of tobacco are retained by the screen cylinder 21 and can be impacted by the airflow again, preventing the already loosened tobacco from being repeatedly impacted and broken. Through the combination of flexible loosening by the pulsed airflow and the screening and distribution by the screen cylinder 21, the breakage rate of tobacco is reduced while loosening the clumps.

[0024] In a further specific example of this disclosure, the area where the nozzles are positioned covers a fan-shaped range extending forward from the throwing starting point along the rotation direction of the drum 5, from 0° to 90°. It should be noted that the throwing starting point refers to the instant the lifting plate 20 throws the tobacco, located on the horizontal side of the drum 5. Extending forward 0° to 90° along the rotation direction of the drum 5 means that the nozzles are arranged within the first half of the fan-shaped area where the tobacco falls after being thrown from the lifting plate 20. Within this area, the tobacco has just been thrown up at a low speed, and the adhesion between them has not yet been further compacted due to the fall; the pulsed airflow makes it easier to disperse the clumps of tobacco. The nozzles are evenly distributed along the fan shape on the loosening nozzle 6, and the nozzle spacing can be 1cm to 3cm.

[0025] In other specific examples of this disclosure, the blowing system also includes a cleaning nozzle 18, which is also disposed in the core of the screen cylinder 21 and arranged parallel to the loosening nozzle 6. The cleaning nozzle 18 is provided with nozzles that are arranged to cover a fan-shaped area extending forward from the starting point of the scattering along the rotation direction of the cylinder 5 within a range of 90° to 180° on the cross-section corresponding to the cylinder 5.

[0026] like Figure 5As shown, this fan-shaped area corresponds to the upper left to left side of the sieve cylinder 21. In this area, there is little or no tobacco spillage, and the nozzles face directly towards the inner wall of the sieve cylinder 21. During the loosening of clumped tobacco, small tobacco particles or debris may clog the mesh of the sieve cylinder 21, affecting the sieving efficiency. The cleaning nozzle 18 sprays a pulsed airflow in this area to blow away the adhered or clogged tobacco. The cleaning nozzle 18 and the loosening nozzle 6 are staggered circumferentially, complementing each other. The loosening nozzle 6 loosens the tobacco, while the cleaning nozzle 18 keeps the mesh of the sieve cylinder 21 clear, jointly ensuring the long-term stable operation of the device. The nozzles are evenly distributed along the fan shape on the cleaning nozzle 18, with a nozzle spacing of 1cm to 6cm.

[0027] To increase the blowing air pressure, multiple sets of loosening nozzles 6 and cleaning nozzles 18 can be set, and the spraying sections of multiple sets of nozzles in the axial direction are not repeated.

[0028] In some specific examples of this disclosure, the apparatus also includes a frame 16, a feeding vibrating conveyor 1, a discharging vibrating conveyor 10, a feed inlet dust hood 2, and a discharge outlet dust hood 22. The drum loosener is mounted on the frame 16, which provides support for the entire apparatus. The feeding vibrating conveyor 1 connects to the feed inlet of the drum loosener and its function is to spread the clumps of tobacco evenly into the screen cylinder 21. The discharging vibrating conveyor 10 connects to the discharge outlet of the drum loosener and is used to transport the loosened tobacco to the next process. The feed inlet dust hood 2 is located at the feed inlet, and the discharge outlet dust hood 22 is located at the discharge outlet; both are used to collect dust generated during the loosening process and fine particles carried by the airflow, preventing dust leakage.

[0029] In a further specific example of this disclosure, the drum loosener also includes a feed hood 3, a feed inlet support hood 4, a discharge outlet support hood 7, a discharge hood 8, and a drive wheel 17. The drum 5 is mounted on the feed inlet support hood 4 and the discharge outlet support hood 7, and is driven by the drive wheel 17. The feed hood 3 is located at the feed inlet, and the discharge hood 8 is located at the discharge outlet. The support hoods support both ends of the drum 5 and allow it to rotate. The drive wheel 17 is typically driven by a motor, which drives the drum 5 to rotate via friction or gears. The feed hood 3 and the discharge hood 8 provide sealing and guiding functions, preventing the tobacco from scattering during feeding and discharging. Through the cooperation of the support hoods and the drive wheel 17, the drum 5 can rotate stably and maintain a set tilt angle, allowing the tobacco to move towards the discharge end under gravity. The tilt angle of the drum 5 can be 3° to 8°, and the rotational speed of the drum 5 can be 9 rpm to 12 rpm.

[0030] In other specific examples of this disclosure, the sieve cylinder 21 is mounted inside the drum 5 via support rods 19. The two ends of the support rods 19 are connected to the inner wall of the drum 5 and the outer wall of the sieve cylinder 21, respectively, creating an annular gap between the sieve cylinder 21 and the drum 5 for the loosened tobacco to pass through. Since the sieve cylinder 21 is fixedly connected to the drum 5 via the support rods 19, the two rotate synchronously without the need for an additional transmission mechanism. The number of support rods 19 can be set as needed, for example, distributed axially and circumferentially, to ensure the coaxiality and stability of the sieve cylinder 21.

[0031] In some specific examples of this disclosure, the jetting system also includes a compressed air pipe 9, a pulse valve 11, a pressure gauge 12, a pressure regulating valve 13, a shut-off valve 14, and a filter valve 15. These valves and gauges are all mounted on the compressed air pipe 9, and the loosening nozzle 6 and the cleaning nozzle 18 are each connected to a set of compressed air pipes 9.

[0032] Specifically, compressed air enters from the air source, filters moisture and impurities are removed by the filter valve 15, the shut-off valve 14 controls the on / off state, the pressure regulating valve 13 adjusts the pressure and is displayed by the pressure gauge 12, and then reaches the pulse valve 11. The pulse valve 11 opens intermittently at a set frequency to form a pulsed airflow, which is finally supplied to the loosening nozzle 6 and the cleaning nozzle 18 respectively. The loosening nozzle 6 and the cleaning nozzle 18 can independently adjust their pressure and frequency. For example, the pulse frequency of the loosening nozzle 6 is 0.2Hz to 2Hz, and the pressure is 0.05MPa to 0.6MPa; the pulse frequency of the cleaning nozzle 18 is 0.5Hz to 2Hz, and the pressure is 0.2MPa to 0.6MPa. Through independent adjustment, the working parameters can be optimized according to the severity of tobacco clumping and the clogging of the mesh of the screen cylinder 21. The pulse valve 11 makes the airflow ejected in a pulsed form, which has a higher instantaneous impact force than continuous airflow, while the average air consumption is lower.

[0033] In a further specific example of this disclosure, an plexiglass window 23 is provided on the discharge hood 8. The operator can observe the loosening of clumps of tobacco at the outlet of the sieve cylinder 21 through this window, such as whether there are still any unloosened clumps of tobacco. Based on the observation, the pressure and pulse frequency of the compressed air can be adjusted in real time. When there are clumps of tobacco at the outlet, the pressure and frequency are increased until the tobacco is completely loosened. The plexiglass window 23 makes the device observable and adjustable, improving its adaptability to different batches and different degrees of clumping of tobacco.

[0034] The working principle of this device is as follows: Before operation, adjust the compressed air pressure. In this embodiment, the drum speed is 11 revolutions per minute, the drum inclination angle is 3.5°, and the rotation is counterclockwise. The screen size of the screen cylinder is 3.5cm. The loosening nozzle is set with nozzles inside the loosening cylinder, and the nozzles are set in the counterclockwise 0°~90° range (if the drum rotates clockwise, then this is the clockwise 0°~90° range). The nozzles are evenly distributed and the nozzle spacing is 2cm. The compressed air pressure is adjusted to 0.25MPa, that is, the pressure regulating valve 13 is adjusted so that the pressure gauge 12 displays 0.25MPa. The control system sets the pulse frequency of the pulse valve 11 to 0.8Hz.

[0035] The cleaning nozzles are installed inside the loosening cylinder, and are located in the counterclockwise 90°~180° range (if the drum rotates clockwise, then this range is clockwise 90°~180°). The nozzles are evenly distributed with a spacing of 3cm. The compressed air pressure is adjusted to 0.6MPa, that is, the pressure regulating valve 13 is adjusted so that the pressure gauge 12 displays 0.6MPa. The control system sets the pulse frequency of the pulse valve 11 to 2Hz.

[0036] Open the feeding vibrating conveyor 1, the discharging vibrating conveyor 10, the drum 5, the inlet dust hood 2, the outlet dust hood 22, and rotate the drum counterclockwise.

[0037] After drying, the clumps of tobacco are evenly conveyed to the inlet of the drum 5 by the feeding vibrating conveyor 1. After the system detects the tobacco on the feeding vibrating conveyor, after a certain delay (65 seconds in this embodiment), the control system opens the pulse valve 11 on the compressed air pipeline. The screen cylinder 21 installed inside the drum rotates counterclockwise synchronously. Multiple lifting plates 20 are installed on the inner wall of the screen cylinder 21. The lifting plates 20 lift up the clumps of tobacco and evenly scatter them. The pulse airflow on the loosening nozzle 6 is synchronously sprayed onto the scattered clumps of tobacco at an upward angle, and the clumps of tobacco are opened.

[0038] After being sieved through the screen cylinder 21, the loosened tobacco falls onto the inner wall of the drum 5. The drum 5 is designed to be inclined from the inlet to the outlet. The loosened tobacco is evenly conveyed to the vibrating conveyor at the outlet of the drum 5. The tobacco that has not been loosened in the screen cylinder 21 continues to be picked up by the lifting plate 20 and evenly scattered until it is broken up by the pulse airflow, thus completing the loosening of the clumps of tobacco.

[0039] For different types of clumped tobacco, the loosening of the clumped tobacco at the outlet of the screen cylinder 21 can be observed through the plexiglass window 23 on the discharge hood 8. Adjust the pressure and pulse frequency of the compressed air entering the loosening nozzle 6. When there are clumps of tobacco at the outlet, increase the pressure and frequency of the compressed air to increase the loosening rate of the clumps of tobacco until the tobacco is completely loosened.

[0040] During the process of loosening the clumps of tobacco, the dust hood 2 at the feed inlet and the dust hood 22 at the discharge outlet work simultaneously to transport the smoke and dust to the dust collector.

[0041] After all the tobacco shreds are loosened, they fall onto the discharge vibrating conveyor 10 and are transported to the next process for stem and stalk removal.

[0042] In this device, the lifting plate 20 picks up the clumps of tobacco and evenly disperses them. A pulsed airflow is simultaneously sprayed onto the dispersed clumps, employing a pulsed airflow loosening mode. There is no mechanical loosening or physical dispersal, resulting in lower breakage during the loosening process. After being loosened, the tobacco is sieved through the screen cylinder 21. Any remaining clumps are then lifted again and loosened by the pulsed airflow, avoiding repeated airflow impacts on the loosened tobacco and significantly reducing breakage during the loosening process.

[0043] Example 2 This embodiment provides a method for loosening and clumping tobacco using a drum-type pulsed airflow, the method comprising the following steps: After the clumps of tobacco are thinned out, they are fed into the sieve cylinder 21. The drive roller 5 and the sieve cylinder 21 rotate together, and the lifting plate 20 picks up and scatters the clumps of tobacco. A pulsed airflow is sprayed onto the scattered clumps of tobacco, causing them to break up. The loosened tobacco passes through the sieve cylinder 21 and falls onto the inner wall of the roller 5, achieving the sieving of the loosened tobacco. The remaining clumps of tobacco are scattered again and subjected to pulsed airflow. At the same time, pulsed airflow is sprayed onto the inner wall of the sieve cylinder 21 to clean the mesh of the sieve cylinder 21. The specific values ​​of the rotation direction of the roller 5 and the parameters of the pulsed airflow can be adjusted according to the characteristics of the tobacco in actual applications.

[0044] This method organically combines scattering, pulsed airflow impact, sieving and separation, circulating loosening, and mesh cleaning. The sieve cylinder 21 serves both as the carrier for scattering and as a sorting device for sieving and retaining unloose tobacco shreds. Unloose tobacco shreds are retained by the sieve cylinder 21 and then re-enter the scattering area, achieving multiple loosening processes until complete disintegration. Loosened tobacco shreds pass through the sieve cylinder 21 and leave, avoiding repeated impact. Simultaneously, the cleaning step ensures the long-term effectiveness of the sieve cylinder 21's mesh. The entire method requires no mechanical stirring or compression, employing a flexible loosening process with a low breakage rate.

[0045] Specific process: (1) Open the inlet and outlet vibrating conveyors, open the drum 5, the inlet dust hood 2 and the outlet dust hood 22, adjust the compressed air pressure (0.25MPa) and pulse airflow frequency (0.8Hz) of the loosening nozzle, and the compressed air pressure (0.6MPa) and pulse airflow frequency (2Hz) of the cleaning nozzle; after drying and screening, the clumps of tobacco are spread thinly through the inlet vibrating conveyor 2 and evenly transported into the cavity of the screen cylinder 21, and the drive wheel 17 drives the drum 5 to rotate counterclockwise.

[0046] (2) When the control system detects the material on the feeding vibrating conveyor 2, the pulse valve 11 opens after a delay of a period of time (65 seconds).

[0047] Inside the sieve cylinder 21, the lifting plate 20 lifts up the clumps of tobacco and evenly scatters them. The pulsed airflow on the loosening nozzle 6 is simultaneously sprayed onto the scattered clumps of tobacco at an upward angle, thus breaking up the clumps of tobacco.

[0048] At the same time, the cleaning nozzle sprays the inner wall of the screen cylinder 21 in a counterclockwise 90°~180° area (this area has no tobacco), cleaning the tobacco clogged on the screen of the inner wall of the screen cylinder 21, which is conducive to the screen cylinder 21 continuing to screen.

[0049] (3) After being loosened, the tobacco falls through the screen on the inner wall of the screen cylinder 21 onto the inner wall of the drum 5. The drum 5 rotates counterclockwise, and the tobacco falls onto the outlet vibrating conveyor 10 under the action of gravity. The tobacco that is not loosened is picked up by the lifting plate 20 inside the screen cylinder 21 and evenly scattered. The pulse airflow on the loosening nozzle 6 is synchronously sprayed onto the scattered clumps of tobacco, and the clumps of tobacco are opened up.

[0050] (4) During the process of loosening the clumped tobacco, the amount of clumped tobacco remaining at the outlet of the screen cylinder 21 is observed through the plexiglass window 23 on the discharge hood 8. Based on the amount of remaining tobacco, the compressed air pressure on the loosening nozzle 6 is adjusted. In this embodiment, the compressed air pressure is adjusted to 0.3MPa and the pulse airflow frequency is adjusted to 0.6Hz. The clumped tobacco is basically completely loosened, but the breakage is relatively light.

[0051] (5) Observe the adhesion of tobacco shreds on the inner wall of the upper left side of the screen cylinder 21 through the plexiglass window 23 on the discharge hood 8. When there are fewer tobacco shreds adhering to the inner wall, the compressed air pressure or pulse frequency on the cleaning nozzle 18 can be reduced. In this embodiment, the compressed air pressure on the cleaning nozzle 18 is adjusted to 0.5MPa and the pulse airflow frequency is adjusted to 1.5Hz. The cleaning effect of the cleaning nozzle is still good.

[0052] After being loosened, the tobacco shreds are conveyed to the next process via the vibrating conveyor 10 at the lower outlet of the roller 5, thus completing the entire material loosening process.

[0053] Example 3 This embodiment provides the application of a drum-type pulsed airflow loosening device for loosening clumped tobacco after drying. The dried tobacco has a low moisture content and high brittleness, making it easily broken when mechanically loosened. This device uses pulsed airflow for flexible loosening, making it particularly suitable for processing such materials. In application, the device is connected after the drying process; the clumped tobacco is loosened by this device before entering the subsequent stem-sorting or cigarette-making process.

[0054] While the specific embodiments of the present invention have been described above, they are 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 drum-type pulse airflow device for loosening and clumping tobacco shreds, characterized in that, include: Drum loosener and jet blowing system; The drum loosening machine includes a drum and a screen cylinder. The screen cylinder is disposed inside the drum and rotates together with the drum. The inner wall of the screen cylinder is provided with a lifting plate. The blowing system includes a loosening nozzle, which is disposed in the core of the screen cylinder. The loosening nozzle has nozzles disposed on the loosening nozzle within the area corresponding to the trajectory of the tobacco shreds thrown by the lifting plate.

2. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 1, characterized in that, The area covers a fan-shaped region extending forward from the throwing point along the direction of drum rotation, from 0° to 90° on the cross-section of the drum.

3. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 1, characterized in that, The spraying system also includes a cleaning spray pipe, which is also located in the core of the screen cylinder and arranged parallel to the loosening spray pipe. The cleaning spray pipe is provided with nozzles, which are located on the cleaning spray pipe and cover a fan-shaped range extending forward from the starting point of the scattering along the rotation direction of the cylinder by 90° to 180° on the cross-section of the cylinder.

4. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 1, characterized in that, It also includes a frame, a feeding vibrating conveyor, a discharging vibrating conveyor, a feed inlet dust hood, and a discharge outlet dust hood; the drum loosener is installed on the frame, the feeding vibrating conveyor is connected to the feed inlet of the drum loosener, the discharging vibrating conveyor is connected to the discharge outlet of the drum loosener, the feed inlet dust hood is set at the feed inlet, and the discharge outlet dust hood is set at the discharge outlet.

5. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 1, characterized in that, The drum loosening machine also includes a feed hood, a feed inlet support hood, a discharge outlet support hood, a discharge hood, and a drive wheel; the drum is installed on the feed inlet support hood and the discharge outlet support hood and is driven by the drive wheel. The feed hood is located at the feed inlet and the discharge hood is located at the discharge outlet.

6. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 1, characterized in that, The screen cylinder is installed inside the drum via a support rod.

7. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 1, characterized in that, The jetting system also includes a compressed air pipe, a pulse valve, a pressure gauge, a pressure regulating valve, a shut-off valve, and a filter valve; the pulse valve, pressure gauge, pressure regulating valve, shut-off valve, and filter valve are installed on the compressed air pipe, and the loosening nozzle and the cleaning nozzle are each connected to a set of compressed air pipes.

8. The drum-type pulse airflow loosening and clump-forming tobacco device as described in claim 3, characterized in that, An acrylic glass window is installed on the discharge hood.

9. A method for loosening and clumping tobacco shreds using a roller-type pulsed airflow, characterized in that, Includes the following steps: After the clumps of tobacco are spread out thinly, they are fed into the sieve cylinder. The drive drum and the sieve cylinder set inside the drum rotate together. The clumps of tobacco are picked up and scattered by the lifting plates on the inner wall of the sieve cylinder. A pulsed airflow is blown onto the scattered clumps of tobacco to break them up; Loose tobacco shreds pass through the sieve cylinder and fall onto the inner wall of the drum, where they are then sieved. Clumps of tobacco shreds that are not loosened are then scattered and pulsed airflow is sprayed on them.

10. The method for loosening and clumping tobacco shreds using a drum-type pulsed airflow as described in claim 9, characterized in that, Pulsed airflow is sprayed onto the inner wall of the screen cylinder to clean the mesh holes.

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