Cigarette cut tobacco winnowing system

Abstract

The invention provides a cigarette tobacco shred winnowing system which comprises tobacco shred feeding equipment, a wind power tobacco shred feeding pipe and tobacco stem removing equipment, tobacco shred materials are stored in the tobacco shred feeding equipment, the wind power tobacco shred feeding pipe is connected with the tobacco shred feeding equipment, the tobacco stem removing equipment and a cigarette system, and the tobacco stem removing equipment is used for separating tobacco stems in the tobacco shred materials. The cigarette cut tobacco winnowing system further comprises winnowing switching equipment, and the winnowing switching equipment is arranged among the cut tobacco feeding equipment, the tobacco stem removing equipment and the cigarette making system and used for controlling the wind power cut tobacco feeding pipe to selectively conduct the cut tobacco feeding equipment and the tobacco stem removing equipment and / or the cut tobacco feeding equipment and the cigarette making system. According to the cigarette cut tobacco winnowing system, the working mode of the cigarette cut tobacco winnowing system can be selectively achieved through the winnowing switching equipment, seamless switching between a conventional cut tobacco supply mode and a tobacco stem removing mode is achieved, material residues are eliminated through cooperative control of delayed closing and the air supplementing device, and the system efficiency is improved.

Description

Technical Field

[0001] This application belongs to the technical field of cigarette manufacturing, and particularly relates to a cigarette cut tobacco air separation system. Background Art

[0002] The existing cigarette cut tobacco air separation system generally adopts a centralized pneumatic conveying scheme, and its core structure consists of a centrifugal fan, an annular pneumatic conveying pipe network and a multi-unit distribution unit. The designed operating parameters of this system are: wind speed 20 - 22 m / s, nominal air volume 800 m 3 / h, and pneumatic conveying of cut tobacco is achieved through a pressure balance pipe. However, the following technical bottlenecks exist in actual applications:

[0003] (1) Unsteady gas-solid two-phase flow problem: There are significant pulsation characteristics in material conveying, with an instantaneous peak value reaching 600 - 800 kg / h, resulting in the fluctuation of the material-air ratio within the range of 0.75 - 1, exceeding the critical threshold of the ideal air separation working condition;

[0004] (2) Dynamic pressure imbalance: The addition of the tobacco stem removal module introduces additional flow resistance, causing distortion of the original pipe network pressure distribution and the operating point of the system deviating from the designed working condition;

[0005] (3) Energy matching disharmony: The air volume required by the tobacco stem removal module exceeds the supply capacity of the main pipeline, forming a local negative pressure area, resulting in a 28% - 35% decrease in the wire suction efficiency;

[0006] (4) Critical wind speed contradiction: When the conveying speed is lower than 18 m / s due to the tobacco stem removal module, wall deposition occurs, and when it exceeds 24 m / s, the tobacco cut tobacco breakage rate increases by 2.3 - 3.1 times. Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a cigarette cut tobacco air separation system to solve the above problems.

[0008] To solve the above technical problems, this application adopts the following technical solutions:

[0009] This application provides a cigarette cut tobacco air separation system, which includes: a wire feeding device, a pneumatic wire feeding pipe, and a tobacco stem removal device. The wire feeding device stores cut tobacco materials. The pneumatic wire feeding pipe is respectively connected to the wire feeding device, the tobacco stem removal device and the cigarette system. The tobacco stem removal device is used to separate tobacco stems from the cut tobacco materials. The cigarette cut tobacco air separation system further includes: an air separation switching device, which is arranged between the wire feeding device, the tobacco stem removal device and the cigarette system, and is used to control the pneumatic wire feeding pipe to selectively conduct the wire feeding device and the tobacco stem removal device and / or the wire feeding device and the cigarette system.

[0010] Furthermore, the air separation switching device includes a commutation device and an air supply compensation device. The air supply compensation device includes an air transportation state and an air supply compensation state, and the air supply compensation device includes an air supply port close to the tobacco stem removal device. The commutation device selectively conducts the wire feeding device and the tobacco stem removal device. When the air supply compensation device is in the air transportation state, the air supply port is closed, the commutation device is conducting, the wire feeding device is started, and the tobacco material enters the tobacco stem removal device. When the air supply compensation device is in the air supply compensation state, the air supply port is conducting, the commutation device is closed, and the wire feeding device stops.

[0011] Furthermore, the tobacco stem removal device includes: a gas-solid separation device and an air curtain air separation device. The gas-solid separation device is connected to the wire feeding device and is used for physically separating impurities in the tobacco material. The air curtain air separation device is connected to the gas-solid separation device and is used for air separating impurities in the tobacco material.

[0012] Furthermore, the gas-solid separation device includes: a gas-solid separation mechanism, a blowing mechanism, and a discharging mechanism. The gas-solid separation mechanism is connected to the wire feeding device. The blowing mechanism is arranged on the side of the gas-solid separation mechanism. The discharging mechanism is arranged below the gas-solid separation mechanism. The gas-solid separation mechanism is used for separating the tobacco material. The blowing mechanism is used for cleaning the gas-solid separation mechanism. The discharging mechanism is used for collecting the separated tobacco material.

[0013] Furthermore, the gas-solid separation mechanism includes: a gas-solid cavity, a vertical gas-solid separation screen plate, and a gas cavity. The vertical gas-solid separation screen plate is arranged between the gas-solid cavity and the gas cavity, and the inclination angle of the vertical gas-solid separation screen plate is 80°-90°. The tobacco material enters the gas-solid cavity from the wire feeding device. The dust of the tobacco material passes through the vertical gas-solid separation screen plate and enters the gas cavity. The tobacco of the tobacco material falls along the vertical gas-solid separation screen plate to the discharging mechanism.

[0014] Furthermore, the blowing mechanism includes: a gas cylinder, an electromagnetic valve, an air pipe, and a blowing pipe. The air pipe is respectively connected to the gas cylinder and the blowing pipe. The electromagnetic valve is used for compressing the air in the gas cylinder. The blowing pipe is used for pulse cleaning the gas-solid separation mechanism.

[0015] Furthermore, an air separation box connected to the gas-solid separation device is arranged inside the air curtain air separation device. The air separation box includes a plurality of adjustable mechanisms, and the adjustable mechanisms are used for dividing the air flow in the air separation box into multiple air curtains.

[0016] Furthermore, the adjustable mechanism includes a support plate and an adjustment plate. The support plate and the adjustment plate are connected to form a triangular plate, and the triangular plate guides the air flow to form an S-shaped path in the air separation box. The adjustment plate adjusts its own length to change the flow distance of the air flow inside the air separation box.

[0017] Further, the tobacco stem removal device further includes: a circulating air supply device, which includes a circulating fan and a circulating air duct. The circulating fan is arranged in the circulating air duct. The air outlet of the circulating air duct is arranged at the bottom of the air curtain air separation device, and the air inlet of the circulating air duct is arranged at the top of the air curtain air separation device.

[0018] Further, the air separation system for cigarette cut tobacco further includes a pressurization compensation device, which includes a power fan and an air volume regulating valve. The power fan and the air volume regulating valve are arranged between the tobacco stem removal device and the cigarette system. The power fan provides compensation air volume, and the compensation air volume is used to stabilize the air velocity of the pneumatic tobacco feeding pipe. The air volume regulating valve is used to adjust the compensation air volume.

[0019] As can be seen from the above technical solutions, the advantages and positive effects of the air separation system for cigarette cut tobacco proposed in this application are as follows:

[0020] In this application, the working mode of the air separation system for cigarette cut tobacco can be selectively switched through the air separation switching device, and the air separation mode and the pneumatic conveying mode of the air separation system for cigarette cut tobacco can be switched separately to solve a series of problems such as unsteady gas-solid two-phase flow, dynamic pressure imbalance, quantity matching disharmony, and critical air velocity contradiction caused by the integration of the embedded tobacco stem removal module in the air separation system for cigarette cut tobacco, realize seamless switching between the conventional tobacco feeding mode and the tobacco stem removal mode, and eliminate material residue and improve system efficiency through coordinated control with the delay closing and air supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above content of this application and the following specific embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solutions.

[0022] Figure 1 is the structural diagram of the existing air separation system for cigarette cut tobacco;

[0023] Figure 2 is the structural diagram of the air separation system for cigarette cut tobacco of this application;

[0024] Figure 3 is the structural diagram of the tobacco stem removal device;

[0025] Figure 4 is the structural diagram of the air-solid separation device;

[0026] Figure 5 is the structural diagram of the air-solid separation mechanism;

[0027] Figure 6 is the structural diagram of the spraying mechanism;

[0028] Figure 7 is the structural diagram of the discharging mechanism;

[0029] Figure 8It is the structural diagram of the rotor;

[0030] Figure 9 It is the structural diagram of the air curtain air separation device;

[0031] Figure 10 It is the installation schematic diagram of the arc-shaped adjusting plate;

[0032] Figure 11 It is the air field analysis diagram of the air separation box;

[0033] Figure 12 It is the air flow schematic diagram of the cigarette cut tobacco air separation system.

[0034] Among them, the description of the attached drawing reference numerals is as follows:

[0035] Feeding equipment: 1;

[0036] Pneumatic feeding pipe: 2;

[0037] Cigarette system: 3;

[0038] Level detection switch: 31;

[0039] Electric air damper: 32;

[0040] Stem rejection equipment: 4;

[0041] Reversing device: 41;

[0042] Air supply supplement device: 42;

[0043] Feeding pipeline: 43;

[0044] Cut tobacco suction inlet: 44;

[0045] Cut tobacco defluffing mechanism: 45;

[0046] Air delivery pipe: 46;

[0047] Impurity removal mechanism: 47;

[0048] Gas-solid separation device: 5;

[0049] Gas-solid separation mechanism: 51;

[0050] Gas-solid cavity: 511;

[0051] Vertical gas-solid separation screen plate: 512; Gas cavity: 513;

[0052] Jetting mechanism: 52;

[0053] Gas cylinder: 521;

[0054] Solenoid valve: 522;

[0055] Air pipe: 523;

[0056] Blowpipe: 524;

[0057] Discharging mechanism: 53;

[0058] Reducer: 531;

[0059] Machine body: 532;

[0060] Rotor: 533;

[0061] Rotating shaft: 534;

[0062] Partition board: 535;

[0063] Air separation box: 6;

[0064] Support plate: 61;

[0065] Adjusting plate: 62;

[0066] Air curtain: 63;

[0067] Circulating air supply device: 7;

[0068] Circulating air duct: 71;

[0069] Circulating fan: 72;

[0070] Air outlet: 73;

[0071] Air inlet: 74;

[0072] Power fan: 81;

[0073] Air volume regulating valve: 82;

[0074] Differential pressure sensor: 9. Detailed implementation mode

[0075] The following details the detailed features and advantages of the present application in the specific implementation mode. The content is sufficient for any person skilled in the art to understand the technical content of the present application and implement it accordingly. And according to the description, claims and drawings disclosed in this specification, those skilled in the art can easily understand the relevant purposes and advantages of the present application.

[0076] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0077] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0078] In this specification and the claims, a number of terms will be referred to, and unless otherwise indicated, these terms will be defined as having the following meanings:

[0079] The meaning of the term "comprising" or "having" is the same as that defined above for "containing", and also includes other forms of this term, such as the gerund form and the singular form in English, meaning including but not limited to, and not intending to exclude other elements, components, integers or steps.

[0080] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. These three situations, where A and B can be singular or plural. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after, but it may also represent a "and / or" relationship. The specific meaning can be understood by referring to the context before and after.

[0081] "At least one" means one or more, and "a plurality" means two or more. "At least one of the following" or its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple.

[0082] To make the purpose, technical solutions, and advantages of the present application clearer, the following will further describe the implementation manners of the present application in detail with reference to the drawings.

[0083] Please refer to Figure 1 , a conventional cut tobacco pneumatic separation system mainly includes a feeding device 1, a pneumatic tobacco feeding pipe 2, a differential pressure sensor 9, and a cigarette making system 3. Among them, the cigarette making system 3 includes a level detection switch 31 and an electric air damper 32.

[0084] Specifically, the wire feeding device 1 quantitatively feeds cut tobacco into the conveying pipeline mechanically or pneumatically. The cut tobacco is driven by the air flow (provided by the pneumatic cut tobacco conveying pipe 2) in the pipeline and conveyed to the cigarette making system 3. Preferably, the wire feeding device 1 is equipped with sensors to monitor the cut tobacco flow rate and conveying state in real time, ensuring the uniform and continuous supply of cut tobacco.

[0085] The pneumatic cut tobacco conveying pipe 2 uses the negative pressure or positive pressure generated by the fan to convey the cut tobacco from the cut tobacco storage cabinet to the cigarette making system 3. The cut tobacco is mixed with the air flow in the pipeline to form a suspended state, reducing cut tobacco breakage. The differential pressure sensor 9 monitors the air pressure and wind speed in the pipeline in real time to ensure the stability of the conveying process. If the air pressure is insufficient or the wind speed is abnormal, the system will automatically adjust the fan power or give an alarm.

[0086] The differential pressure sensor 9 is installed at a key position of the pneumatic cut tobacco conveying pipe 2 to measure the pressure difference between the two ends of the pipeline. When the air pressure or wind speed is abnormal, the sensor feeds back the signal to the control system to adjust the fan power or the wire feeding speed. The differential pressure sensor 9 can also be used to detect pipeline blockage or air leakage to ensure the safe operation of the system.

[0087] The cigarette making system 3 is used to roll the cut tobacco into cigarette rods. Among them, the level detection switch 31 monitors the cut tobacco level in the hopper of the cigarette making system 3, and the electric damper 32 controls the flow rate of the cut tobacco entering the cigarette making system 3.

[0088] Exemplarily, its working process is as follows:

[0089] 1. The wire feeding device 1 feeds the cut tobacco into the pneumatic cut tobacco conveying pipe 2.

[0090] 2. The pneumatic cut tobacco conveying pipe 2 conveys the cut tobacco to the hopper of the cigarette making system 3 through the air flow.

[0091] 3. The level detection switch 31 monitors the cut tobacco level in the hopper in real time: if the level is too low, it triggers the wire feeding device 1 to supplement the cut tobacco; if the level is too high, the wire feeding is stopped.

[0092] 4. The electric damper 32 adjusts the cut tobacco flow rate according to the signal of the level detection switch 31.

[0093] 5. The differential pressure sensor 9 monitors the air pressure and wind speed in the pneumatic cut tobacco conveying pipe 2 to ensure stable conveying.

[0094] 6. The cigarette making system 3 rolls the cut tobacco into cigarette rods to complete the production.

[0095] Please refer to Figure 2 and Figure 3 , the cigarette cut tobacco air separation system provided by this application includes: a wire feeding device 1, a pneumatic cut tobacco conveying pipe 2, a tobacco stem removal device 4, an air separation switching device, and a pressurization compensation device.

[0096] The wire feeding device 1 stores cut tobacco materials. The pneumatic wire feeding pipe 2 is respectively connected to the wire feeding device 1, the cut tobacco stalk removing device 4 and the cigarette making system 3. The cut tobacco stalk removing device 4 is used to separate the cut tobacco stalks in the cut tobacco materials.

[0097] The air separation switching device is arranged between the wire feeding device 1, the cut tobacco stalk removing device 4 and the cigarette making system 3, and is used to control the pneumatic wire feeding pipe 2 to selectively conduct the wire feeding device 1 and the cut tobacco stalk removing device 4 and / or the wire feeding device 1 and the cigarette making system 3.

[0098] The air separation switching device includes a commutation device 41 and a supplementary air device 42. The supplementary air device 42 includes an air feeding state and a supplementary air state. The supplementary air device 42 includes a supplementary air port close to the cut tobacco stalk removing device 4. The commutation device 41 can selectively conduct the wire feeding device 1 and the cut tobacco stalk removing device 4.

[0099] When the supplementary air device 42 is in the air feeding state, the supplementary air port is closed, the commutation device 41 is conducted, the wire feeding device 1 is started, and the cut tobacco materials enter the cut tobacco stalk removing device 4.

[0100] When the supplementary air device 42 is in the supplementary air state, the supplementary air port is conducted, the commutation device 41 is closed, and the wire feeding device 1 stops.

[0101] Specifically, the commutation device 41 is arranged on the air feeding pipeline and has two modes: the air feeding mode: following the conventional wire feeding logic, the materials are directly transported to the cigarette making system 3. The air separation mode: enabling the cut tobacco stalk removing device 4, and the materials are transported after being separated by air separation.

[0102] The supplementary air device 42 has two states: the air feeding mode and the supplementary air mode.

[0103] The air feeding mode: the differential pressure sensor 9 and the wire feeding device 1 work normally, and the materials are continuously transported.

[0104] The supplementary air mode: the differential pressure sensor 9 fails, the wire feeding device 1 stops, and the supplementary air pipeline is opened to maintain the system pressure.

[0105] 1. Wire feeding start-up stage:

[0106] When the cigarette making system 3 demands wire feeding, the electric air damper 32 is opened, and after the differential pressure sensor 9 detects that the differential pressure meets the standard, the wire feeding device 1 is started.

[0107] The materials are transported to the wire collecting box after being separated by air separation by the cut tobacco stalk removing device.

[0108] 2. Wire feeding termination stage:

[0109] After the level detection switch 31 detects that the wire collecting box is full, the electric air damper 32 is closed with a time delay (to ensure that the materials in the cut tobacco stalk removing device are processed).

[0110] The air supply device 42 is switched to the air supply mode, cutting off the material supply from the tobacco stem feeding device 1 to prevent new materials from entering the tobacco stem removal device.

[0111] 3. Silk supply recovery stage:

[0112] After the material in the wire collection box is exhausted, the air supply device 42 switches back to the air delivery mode, the differential pressure sensor 9 is reset, and the wire feeding device 1 is restarted.

[0113] Mode switch:

[0114] The wind delivery mode or the wind selection mode is selected by the reversing device 41.

[0115] Air delivery mode: The airflow entering the embedded tobacco stem removal device is closed, and the airflow enters the original air delivery pipeline channel.

[0116] Air selection mode: the original air delivery pipeline channel is closed, and the airflow enters the channel of the embedded tobacco stem removal device.

[0117] Wire supply control:

[0118] In the air selection mode, the air supply device 42 is initially in the air delivery state, the air supply port is closed, the material conveying pipe is connected, the air flow enters the embedded tobacco stem removal device from the wire feeding device 1, and the differential pressure sensor 9 triggers the wire feeding device 1 to start.

[0119] After being processed by the rejecting device, the material is transported from the material outlet to the wire collection box. When the material is full, the electric air door 32 is triggered to delay closing (for example, delaying 5 seconds).

[0120] The air supply device 42 is switched to the air supply mode, the air supply port is turned on, and the material conveying pipe in front of the air supply port is closed. The air flow enters the embedded tobacco stem removal device from the air supply port, the differential pressure sensor 9 fails, and the tobacco feeding device 1 stops.

[0121] Resuming the supply of wire: After the material level detection switch 31 in the wire collection box detects that the wire is empty, the air supply device 42 is reset to the air delivery mode, and the cigarette tobacco air selection system re-enters the wire supply process.

[0122] In addition, when the wind-powered wire feeding tube 2 connects the wire feeding device 1 and the cigarette system 3, the working method of the cigarette tobacco wind selection system can refer to the existing technology part and will not be repeated here.

[0123] It can be understood that the present application realizes free switching of the two modes through the coordinated control of the reversing device 41 and the air supply device 42, and has strong compatibility. The delayed closing mechanism of the electric air door 32 ensures that the material in the tobacco stem removal device is completely processed to reduce waste. The air supply mode cuts off the feed of the tobacco thread feeder to avoid interference with the pressure difference signal and improve the stability of the system.

[0124] Please refer to Figure 4, the tobacco stem removal device 4 includes: an air-material separation device 5 and an air curtain air separation device. The air-material separation device 5 is connected to the wire feeding device 1, and the air-material separation device 5 is used to physically separate impurities in the cut tobacco material; the air curtain air separation device is connected to the air-material separation device 5, and the air curtain air separation device is used to air-separate impurities in the cut tobacco material.

[0125] Preferably, after the cut tobacco material enters the tobacco stem removal device 4 from the feeding pipeline 43, the cut tobacco material is loosened by the cut tobacco deagglomeration mechanism 45, and then the cut tobacco material is transported to the air-material separation device 5.

[0126] The air-material separation device 5 includes: an air-material separation mechanism 51, a blowing mechanism 52 and a discharging mechanism 53. The air-material separation mechanism 51 is connected to the wire feeding device 1. The blowing mechanism 52 is arranged on the side of the air-material separation mechanism 51. The discharging mechanism 53 is arranged below the air-material separation mechanism 51. The air-material separation mechanism 51 is used to separate the cut tobacco material. The blowing mechanism 52 is used to clean the air-material separation mechanism 51. The discharging mechanism 53 is used to collect the separated cut tobacco material.

[0127] Please refer to Figures 5 - 8 , the air-material separation mechanism 51 includes: an air-material cavity 511, a vertical air-material separation screen plate 512 and a gas cavity 513. The vertical air-material separation screen plate 512 is arranged between the air-material cavity 511 and the gas cavity 513, and the inclination angle of the vertical air-material separation screen plate 512 is 80°-90°. The cut tobacco material enters the cut tobacco suction port 44 from the feeding pipeline 43. The cut tobacco material first enters the air-material cavity 511. The dust in the air-material cavity 511 passes through the vertical air-material separation screen plate 512 and enters the gas cavity 513. The cut tobacco of the cut tobacco material falls along the vertical air-material separation screen plate 512 to the discharging mechanism 53.

[0128] The blowing mechanism 52 includes: a gas cylinder 521, an electromagnetic valve 522, an air pipe 523 and a blowing pipe 524. The air pipe 523 is respectively connected to the gas cylinder 521 and the blowing pipe 523. The electromagnetic valve 522 is used to compress the air in the gas cylinder 521. The blowing pipe 524 is used to perform pulse cleaning on the air-material separation mechanism 51.

[0129] Specifically, the air-material separation device 5 includes the following components: the blowing mechanism 52: used to periodically clean the vertical air-material separation screen plate 512; the air-material separation mechanism 51: to achieve efficient air-material separation; the discharging mechanism 53: to discharge the separated material in a sealed manner.

[0130] The air-material separation mechanism 51 includes a vertically arranged vertical air-material separation screen plate 512. When the material moves from top to bottom, it uses inertia to wash the screen plate to prevent material accumulation. The timing blowing mechanism 52 blows the screen plate with compressed air regularly to ensure its cleanliness; the discharging mechanism 53 adopts a rotor 533 type structure to ensure sealed discharging.

[0131] The timed blowing mechanism 52 consists of a gas cylinder 521, a solenoid valve 522, an air pipe 523, and a blowing pipe 524. The gas cylinder 521 stores compressed air. After the solenoid valve 522 is opened regularly, the compressed air is transported through the air pipe 523 to the blowing pipe 524 to conduct pulsed cleaning on the vertical air-material separation mesh plate 512.

[0132] The air-material separation mechanism 51: includes an air-material cavity 511, a vertical air-material separation mesh plate 512, and a gas cavity 513. After the material enters the air-material cavity 511, the airflow carries the dust through the mesh plate into the gas cavity 513, and the material falls along the mesh plate to the discharging mechanism 53 under the action of inertia.

[0133] The discharging mechanism 53: consists of a speed reducer 531, a machine body 532, a rotor 533, and a rotating shaft 534. The rotor 533 is provided with four partitions 535. The edges of the partitions 535 are attached to the inner wall of the machine body 532 with soft scraping skins to form a sealed space. The rotor 533 is driven to rotate by the speed reducer 531 to achieve continuous discharging.

[0134] Optionally, the vertical air-material separation mesh plate 512 can be replaced with a multi-layer structure or different pore size materials to adapt to different material characteristics; the blowing mechanism 52 can adopt multiple groups of blowing pipes 524 to enhance the cleaning effect.

[0135] It can be understood that by using the design of the vertical air-material separation mesh plate 512 and inertial scouring, stable air-material separation can be achieved at high wind speeds, and the volume is reduced by more than 50% compared with traditional devices. The timed blowing mechanism 52 automatically cleans the mesh plate to avoid blockage and improves the long-term operation stability. The discharging mechanism 53 has good sealing performance to prevent air leakage and ensure the separation efficiency.

[0136] Please refer to Figure 9 , inside the air curtain air separation device, there is an air separation box 6 connected to the air-material separation device 5. Inside the air separation box 6, there are multiple groups of adjustable mechanisms, and the adjustable mechanisms are used to divide the airflow inside the air separation box 6 into multiple air curtains.

[0137] The adjustable mechanism includes a support plate 61 and an adjustment plate 62. The support plate 61 and the adjustment plate 62 are connected to form a triangular plate, and the triangular plate guides the airflow to form an S-shaped path inside the air separation box 6; the adjustment plate 62 adjusts its own length to change the flow distance of the airflow inside the air separation box 6.

[0138] Please refer to Figure 10 and Figure 11 , the adjustable mechanism also includes an arc-shaped adjustment plate 62, and the arc-shaped adjustment plate 62 is arranged at the bottom of the air separation box 6 to guide the airflow inside the air separation box 6 and reduce the eddy current dead angle.

[0139] The impurity removal mechanism 47 of the cigarette cut tobacco air separation system is arranged at the bottom of the air separation box 6 to clean the residual scraps in the cut tobacco material.

[0140] It can be understood that the core design of the multi-stage air curtain structure in the air separation box 6 lies in dividing the air flow in the air separation box 6 into multiple layers of air curtains 63 (such as six groups of air curtains) through the combination of multiple sets of triangular plates and adjusting plates 62, forming a multi-S-shaped air flow path. The specific working principle is as follows:

[0141] 1. Material separation process:

[0142] After the material enters the air separation box 6 from the throwing device, under the action of the dust removal air, the lighter material moves upward due to the wind force, while the heavier material moves downward due to gravity.

[0143] Each layer of air curtain 63 performs a screening function on the material. The lighter material needs to pass through the air curtain 63 layer by layer before it can be discharged from the miscellaneous gas lock, while the heavier material gradually sinks in each layer of air curtain 63 due to insufficient wind force.

[0144] 2. Gradual reduction of the material-air ratio:

[0145] As the material passes through the air curtain 63 layer by layer, the wind speed of each layer of air curtain 63 can be independently adjusted through the adjusting plate 62, so as to control the passing rate of the material.

[0146] Since each layer of air curtain 63 intercepts part of the heavier material, when reaching the last layer of air curtain 63, the material flow rate is significantly reduced, and finally the material-air ratio is gradually reduced.

[0147] 3. Synergistic effect of the triangular plate and the adjusting plate 62:

[0148] The triangular plate is used to guide the air flow to form a stable S-shaped path, ensuring the uniform distribution of the air curtain 63.

[0149] The adjusting plate 62 realizes the precise control of the wind speed of each layer of air curtain 63 by changing the internal space size of the air separation box 6.

[0150] 4. Dynamic adaptability:

[0151] By adjusting the wind speed of different levels of air curtain 63, it can adapt to materials with different densities and particle sizes, improving the air separation efficiency and accuracy.

[0152] It can be understood that the gradient wind speed formation mechanism: the adjusting plate 62 adjusts the wind speed of each layer of air curtain 63 by changing the internal cross-sectional area of the air separation box 6 (for example, the cross-sectional area of the first layer is large → the wind speed is low, and the cross-sectional area of the sixth layer is small → the wind speed is high); combined with the guiding effect of the triangular plate, the air flow generates a vortex effect in the S-shaped path, enhancing the separation effect of light / heavy materials.

[0153] Experimental verification: When the wind speed gradient is 0.5 - 2.5 m / s, the separation efficiency of the vortex air flow for materials with a particle size < 2 mm is increased by 35%.

[0154] Operation process:

[0155] Step S1: Start the wire feeding system, and the material is thrown into the air separation box 6 through the discharging mechanism 53;

[0156] Step S2: Activate the circulating fan 72 to generate a multi-stage vortex air flow;

[0157] Step S3: Monitor the material-air ratio in real time, and optimize the air separation effect by adjusting the air curtain mechanism;

[0158] Step S4: The stem is discharged through the impurity discharging mechanism, and the qualified cut tobacco is transported to the wire collecting box.

[0159] Please refer to Figure 12 , after adopting the six-layer air curtain structure, the material-air ratio decreases by about 30% - 80% gradually from the first layer to the sixth layer, significantly improving the recovery rate and air separation purity of light materials. The design of the multi-stage air curtain effectively reduces the residue of impurities and reduces the subsequent processing load.

[0160] The cut tobacco stem removing device 4 further includes: a circulating air supply device 7, and the circulating air supply device 7 includes a circulating fan 72 and a circulating air duct 71. The circulating fan 72 is arranged in the circulating air duct 71. The air outlet 73 of the circulating air duct 71 is arranged at the bottom of the air curtain air separation device, and the air inlet 74 of the circulating air duct 71 is arranged at the top of the air curtain air separation device.

[0161] The circulating air duct 71 is communicated with the air delivery pipe 46 connecting the air material separation device 5 to stabilize the air volume inside the cut tobacco air separation system of the cigarette.

[0162] It can be understood that the independent air path design of the circulating air duct 71 of the circulating air supply device 7 avoids competing for air with the pneumatic wire feeding pipe 2, ensuring the balance of the rear-end wind force. After the material enters the air separation box 6, under the action of multiple gradient air curtains, the heavy stem penetrates the air curtain and falls, and the light cut tobacco rises with the air flow. After 6-stage air separation of the cut tobacco, the material-air ratio gradually drops to 0.1 - 0.2, realizing high-precision separation.

[0163] The pressurization compensation device includes a power fan 81 and an air volume regulating valve 82. The power fan 81 and the air volume regulating valve 82 are arranged between the cut tobacco stem removing device 4 and the cigarette system 3. The power fan 81 provides compensation air volume, and the compensation air volume is used to stabilize the wind speed of the pneumatic wire feeding pipe 2. The air volume regulating valve 82 is used to adjust the compensation air volume.

[0164] The wind force of the cut tobacco air separation system of the present application mainly includes:

[0165] Wire feeding pipe wind force (Q1): As the main wind force source, it is responsible for sucking, transporting and preliminary air separation of the cut tobacco;

[0166] Circulating air system (Q2): An independent circulating air path, compensating for the insufficient wind force in the air separation area and adjusting the air separation precision;

[0167] Boost compensation air volume (Q3): To offset the pressure loss introduced by the embedded device and maintain the stable wind speed in the front-end pipeline.

[0168] It can be understood that the embedded tobacco stem removal device: integrates a circulating air system, with its air inlet 74 located below the device and the air outlet 73 located above, and the internal air flow is circulated by the circulating fan 72; the boost compensation device: is installed at the rear end of the air separation equipment to supplement the air volume lost due to pressure loss and ensure a constant wind speed in the front-end wire suction pipeline; the dynamic adjustment mechanism: by adjusting the frequency of the circulating fan 72, flexibly control Q2, optimize the material-air ratio and the air separation effect.

[0169] Total air separation air volume: Q total = Q1 (air volume of the wire feeding pipe) + Q2 (circulating air volume) + Q3 (compensation air volume)

[0170] Air volume of the front-end pipeline: Q1 + Q3, compensating for pressure loss without affecting the conveying wind speed;

[0171] Air volume of the rear-end pipeline: Keep the original Q1 to avoid material breakage caused by wind speed fluctuations.

[0172] It can be understood that wind force balance: By the coordinated compensation of Q1 and Q3, maintain the stable total wind pressure of the system; improvement of air separation efficiency: The circulating air system reduces the material-air ratio and enhances the separation accuracy of tobacco stems; low breakage rate: Boost compensation avoids the increase in the front-end wind speed and reduces the risk of tobacco shredding.

[0173] Specifically, integrate the circulating air system inside the embedded tobacco stem removal device and connect an independent circulating fan 72;

[0174] Add a boost compensation device at the rear end of the device. The boost compensation device includes a power fan 81 and an air volume regulating valve 82. The fan provides power, and the air volume is controlled by the valve. The air volume regulation range is 200 - 400 m 3 / h.

[0175] Operation process:

[0176] Step A1: Start the wind force of the wire feeding pipe (Q1) to convey tobacco silk to the air separation equipment.

[0177] Specifically, Q1 is the main wind force, and its wind force flow direction enters the bottom of the air separation box 6 from the feeding pipeline 43 and flows upward to the top of the air separation box 6.

[0178] Step A2: Turn on the circulating fan (Q2) and adjust the frequency according to the tobacco silk flow rate to optimize the air separation accuracy.

[0179] Specifically, the wind force of Q2 is generated by the circulating fan 72, and its wind force flow direction circulates along the circulating air duct 71.

[0180] Step A3: Activate boost compensation (Q3) and monitor the wind speed in the front-end pipeline in real time to ensure that it is stable at 20-22m / s.

[0181] Specifically, Q3 is the same as Q1. Wind enters the air separation box 6 from the feed pipeline 43. When it reaches the air volume regulating valve 82, the power fan 81 drives Q3 to flow outward, offsetting the pressure loss introduced by the tobacco stem removal equipment 4 and maintaining the stability of the wind speed in the front-end pipeline.

[0182] In this specification, reference to "one embodiment", "one specific implementation" means that the specific features, structures or characteristics described in conjunction with the embodiment / specific implementation are included in at least one embodiment / specific implementation of the present invention. Therefore, the phrase "in one embodiment / specific implementation" appearing in various places in this specification does not necessarily refer to the same embodiment / setting, but may refer to possible. In addition, specific features, structures or characteristics can be combined in one or more embodiments / settings in any suitable manner, as can be understood by a person of ordinary skill in the art from this disclosure.

[0183] Similarly, it should be understood that in the above description of exemplary embodiments / specific embodiments of the present invention, various features of the present invention are sometimes combined together in a single embodiment / specific embodiment or its drawings and descriptions, the purpose of which is to simplify the disclosure and assist in understanding one or more of the various inventive aspects.

[0184] However, except for expressly stated contrary guidance or obvious technical contradiction or exclusivity, this patent's description method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim.

[0185] Rather, what the claims reflect is that inventive aspects lie in less than all features of a single foregoing disclosed embodiment / implementation. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment / implementation of the invention.

[0186] In addition, although some embodiments / specific implementations described herein include but do not include some other features included in other embodiments / specific implementations, the combination of features of different embodiments / specific implementations is intended to be within the scope of the present invention and to form different embodiments / specific implementations, which can be understood by those skilled in the art.

[0187] For example, in the following claims, the embodiments / specific implementations of any claim can be used in any combination. The terms and expressions used herein are for descriptive purposes only, and the present application should not be limited to these terms and expressions. The use of these terms and expressions does not mean excluding any equivalent features of the illustration and description (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be regarded as covering all such equivalents.

[0188] It should be noted that the terms and expressions used in this specification are for illustration rather than limitation. In the use of these terms and expressions, there is no intention to exclude any equivalents of the features shown and described or parts thereof, but it should be recognized that various modifications may exist within the scope claimed by the present invention.

[0189] Therefore, it should be understood that although the present invention has been specifically disclosed through preferred embodiments, exemplary embodiments, and optional features, those skilled in the art may adopt variations or alternatives of the concepts disclosed in this specification. Thus, such variations and alternatives are considered to be within the scope of the present invention defined by the appended claims. The specific embodiments given in this specification are examples of useful embodiments of the present invention. It is obvious to those skilled in the art that many variations of the devices, device components, and method steps disclosed in this specification can be used to implement the present invention.

[0190] Similarly, it should be pointed out that although the present application has been described with reference to current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present application. Without departing from the spirit of the present invention, various equivalent changes or substitutions can be made. Therefore, as long as the changes and variations of the above embodiments are within the substantial spirit scope of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A cigarette cut tobacco air separation system, the cigarette cut tobacco air separation system comprising: A wire-feeding device, a pneumatic wire-feeding pipe, and a tobacco stem removing device. The wire-feeding device stores tobacco shred materials. The pneumatic wire-feeding pipe is respectively connected to the wire-feeding device, the tobacco stem removing device, and a cigarette-making system. The tobacco stem removing device is used for separating tobacco stems from the tobacco shred materials. It is characterized in that the cigarette tobacco screening system further includes: A screening switching device, which is arranged between the wire-feeding device, the tobacco stem removing device, and the cigarette-making system, and is used for controlling the pneumatic wire-feeding pipe to selectively conduct the wire-feeding device and the tobacco stem removing device and / or the wire-feeding device and the cigarette-making system.

2. The cigarette cut tobacco winnowing system according to claim 1, wherein The screening switching device includes a reversing device and a make-up air device. The make-up air device includes a wire-feeding state and a make-up air state. The make-up air device includes a make-up air port close to the tobacco stem removing device; The reversing device can selectively conduct the wire-feeding device and the tobacco stem removing device; When the make-up air device is in the wire-feeding state, the make-up air port is closed, the reversing device is conducted, the wire-feeding device is started, and the tobacco shred materials enter the tobacco stem removing device; When the make-up air device is in the make-up air state, the make-up air port is conducted, the reversing device is closed, and the wire-feeding device stops.

3. The cigarette cut tobacco winnowing system according to claim 1, wherein The tobacco stem removing device includes: a gas-solid separation device and an air curtain screening device, The gas-solid separation device is connected to the wire-feeding device and is used for physically separating impurities in the tobacco shred materials; The air curtain screening device is connected to the gas-solid separation device and is used for screening and separating impurities in the tobacco shred materials.

4. The cigarette cut tobacco pneumatic separation system according to claim 3, wherein, The gas-solid separation device includes: a gas-solid separation mechanism, a blowing mechanism, and a discharging mechanism. The gas-solid separation mechanism is connected to the wire-feeding device, The blowing mechanism is arranged on the side of the gas-solid separation mechanism, and the discharging mechanism is arranged below the gas-solid separation mechanism, The gas-solid separation mechanism is used for separating the tobacco shred materials, the blowing mechanism is used for cleaning the gas-solid separation mechanism, and the discharging mechanism is used for collecting the separated tobacco shred materials.

5. The cigarette cut tobacco pneumatic separation system according to claim 4, characterized in that, The gas-solid separation mechanism includes: a gas-solid cavity, a vertical gas-solid separation screen plate, and a gas cavity, The vertical gas-solid separation screen plate is arranged between the gas-solid cavity and the gas cavity, and the inclination angle of the vertical gas-solid separation screen plate is 80° - 90°, The tobacco shred materials enter the gas-solid cavity from the wire-feeding device. The dust of the tobacco shred materials passes through the vertical gas-solid separation screen plate and enters the gas cavity. The tobacco shreds of the tobacco shred materials fall along the vertical gas-solid separation screen plate to the discharging mechanism.

6. The cigarette cut tobacco winnowing system according to claim 4, characterized in that, The blowing mechanism includes: a gas cylinder, an electromagnetic valve, an air pipe, and a blowing pipe. The air pipe is respectively connected to the gas cylinder and the blowing pipe, The electromagnetic valve is used for compressing the air in the gas cylinder, The blowing pipe is used for pulse cleaning of the gas-solid separation mechanism.

7. The cigarette cut tobacco winnowing system according to claim 3, wherein Inside the air curtain screening device, there is a screening box body connected to the gas-solid separation device, The screening box body includes a plurality of adjustable mechanisms, The adjustable mechanisms are used for dividing the air flow in the screening box body into multiple air curtains.

8. The cigarette cut tobacco winnowing system according to claim 7, characterized in that, The adjustable mechanism includes a support plate and an adjustment plate, and the support plate is connected to the adjustment plate to form a triangular plate. The triangular plate guides the air flow to form an S-shaped path within the winnowing box. The adjustment plate adjusts its own length to change the flow distance of the air flow inside the winnowing box.

9. The cigarette cut tobacco pneumatic separation system according to claim 3, wherein The tobacco stem removal device further includes a circulating air supply device, and the circulating air supply device includes a circulating fan and a circulating air duct. The circulating fan is arranged in the circulating air duct. The air outlet of the circulating air duct is arranged at the bottom of the air curtain winnowing device. The air inlet of the circulating air duct is arranged at the top of the air curtain winnowing device.

10. The cigarette cut tobacco winnowing system according to claim 3, characterized in that, The cigarette cut tobacco winnowing system further includes a boosting compensation device, and the boosting compensation device includes a power fan and an air volume regulating valve. The power fan and the air volume regulating valve are arranged between the tobacco stem removal device and the cigarette system. The power fan provides a compensation air volume, and the compensation air volume is used to stabilize the wind speed of the pneumatic tobacco conveying pipe, and the air volume regulating valve is used to adjust the compensation air volume.

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