Secondary winnowing system

Abstract

The utility model belongs to the technical field of tobacco processing, and discloses a secondary winnowing system. The device comprises a feeding mechanism, a first winnowing device, a first conveying device and a second winnowing device, the first conveying device conveys tobacco stem shreds into the second winnowing device, a circulating pipe is installed on an air inlet of a fan, a main conveying pipe is vertically installed on the upper side of the first winnowing device, the main conveying pipe extracts the tobacco shreds, and the second winnowing device conveys the tobacco stem shreds into the second winnowing device. An auxiliary conveying pipe is installed on the upper side of the second winnowing device, the auxiliary conveying pipe extracts tobacco shreds, the auxiliary conveying pipe is communicated with a circulating pipe, a filter screen is installed at the joint of the circulating pipe and the auxiliary conveying pipe, and the auxiliary conveying pipe is further communicated with a main conveying pipe; the problems that in the prior art, tobacco shreds subjected to secondary winnowing fall on a main conveying belt, the tobacco shreds are stacked abnormally, and the tobacco shreds are blocked in the subsequent processing process are solved.

Description

Technical Field

[0001] This utility model relates to the field of tobacco processing technology, and in particular to a secondary air separation system. Background Technology

[0002] Clumps of tobacco stems and shreds can occur during tobacco processing. This clumping is mainly caused by the airlocks on existing tobacco processing production lines that compress the tobacco material. In addition, due to the varying quality of raw materials from different origins, some tobacco may contain impurities such as stems and shreds. Even after the tobacco is dried in the SH23B low-speed airflow dryer, wet clumps and strands may still remain inside, resulting in inconsistent tobacco quality. When the tobacco is finally made into cigarettes, quality problems such as punctures and hollow ends may occur.

[0003] In existing technology, a vertical air separator is used to remove wet clumps, clumps, stems, and stalks from tobacco shreds. By feeding the tobacco shreds into the air separator, heavier clumps, clumps, stems, and stalks fall automatically, while lighter tobacco shreds are sucked out by a fan onto a discharge pipe or conveyor belt. Because the air separator's separation capacity is relatively weak, to remove more impurities, one method is to install multiple screening devices at the rear of the dryer, with the air separator providing auxiliary screening, forming a multi-stage screening process. The most common approach is to remove impurities through two stages of screening. The second-stage air separator receives the tobacco shreds left over from the previous stage and performs air separation, further separating the tobacco shreds. The remaining dry tobacco shreds can be recycled, avoiding waste. However, installing a second-stage air separator increases the required conveying equipment. The second-stage separator needs to combine the tobacco shreds separated by the first-stage separator. Typically, the second-stage separated tobacco shreds are transported via pneumatic conveying to an auxiliary conveyor belt, and then from there to the main conveyor belt. However, this can lead to abnormal stacking of tobacco shreds, with excessively high density in some areas, causing blockages during subsequent processing. Furthermore, this structure involves multiple conveyor belts transporting tobacco shreds or tobacco stems, further increasing factory space by using conveyor belts to transport the air-separated tobacco shreds. Another approach typically involves increasing the working airflow of the air separator to improve the screening capacity of a single unit. However, this results in energy waste and increased noise during fan operation. Utility Model Content

[0004] The purpose of this invention is to provide a secondary air separation system that solves the problem in the prior art where tobacco shreds fall onto the main conveyor belt during secondary air separation, leading to abnormal stacking of tobacco shreds and causing blockages in subsequent processing.

[0005] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a secondary air separation system, comprising:

[0006] The feeding mechanism conveys tobacco stems;

[0007] The first air separation device, wherein the feeding mechanism conveys the tobacco stems into the first air separation device;

[0008] A first conveying device receives the tobacco stems discharged from the first air separation device;

[0009] The second air separation device is used, wherein the first conveying device conveys the tobacco stems into the second air separation device;

[0010] A fan, wherein a circulation pipe is installed on the air inlet of the fan;

[0011] The first air separation device has a main conveying pipe vertically installed on its upper side, which draws out the tobacco. The second air separation device has an auxiliary conveying pipe installed on its upper side, which draws out the tobacco. The auxiliary conveying pipe is connected to the circulation pipe. A filter screen is installed at the junction of the circulation pipe and the auxiliary conveying pipe. The auxiliary conveying pipe is also connected to the main conveying pipe.

[0012] Preferably, the end of the auxiliary conveying pipe is connected to a feeder, which collects the tobacco shreds in the auxiliary conveying pipe, and the bottom of the feeder is connected to the main conveying pipe.

[0013] Preferably, the feeder includes a collecting section, which is surrounded by a conical cavity, where the tobacco shreds are collected at the bottom, and an observation window is installed on the side wall of the collecting section.

[0014] Preferably, a vibrating screen is installed at the bottom of the second air separation device, and an air inlet pipe is installed on the lower side of the vibrating screen. The air inlet pipe is connected to the circulation pipe, and the fan sends air into the air inlet pipe.

[0015] Preferably, the feeding mechanism includes a first feeder, and a first cylinder is installed on the side wall of the first air separator. The first feeder includes a first rotating blade and a first motor. The first rotating blade is circumferentially installed on the output shaft of the first motor. Adjacent first rotating blades and the inner wall of the first cylinder form a first receiving cavity. The first receiving cavities are isolated from each other. The first cylinder is also in communication with the inside of the first air separator. The feeding mechanism also includes a first vibrating groove, which conveys the tobacco stems into the first cylinder.

[0016] Preferably, the first conveying device includes a first conveyor belt and a second vibrating trough. The first conveyor belt includes a conveying section and a lifting section. The conveying section is installed below the outlet of the first air separator. The lifting section is inclinedly connected to one end of the conveying section. The second vibrating trough is installed below the lifting section. The second vibrating trough receives the tobacco stems that fall from the top of the lifting section and conveys the tobacco stems into the second air separator.

[0017] Preferably, a second cylinder and a second feeder are installed on the side wall of the second air separation device. The second feeder includes a second rotating blade and a second motor. The output shaft of the second motor is circumferentially equipped with the second rotating blade. Adjacent second rotating blades and the inner wall of the second cylinder form a second receiving cavity. The second receiving cavities are isolated from each other. The second cylinder is also connected to the second air separation device. The second vibration groove transports the tobacco stems into the second cylinder.

[0018] Preferably, a third cylinder is installed at the bottom of the feeder, and a third feeder is installed on the third cylinder. The third feeder includes a third rotating blade and a third motor. The third rotating blade is circumferentially installed on the output shaft of the third motor. Adjacent third rotating blades and the inner wall of the third cylinder form a third receiving cavity. The third receiving cavities are isolated from each other. The third cylinder is also connected to the main conveying pipe.

[0019] Preferably, the side wall of the main conveying pipe is provided with an opening, a bolt is rotatably installed on the upper side of the opening, a cover plate is fixed on the bolt, and the cover plate covers the opening.

[0020] Preferably, the main delivery pipe, the delivery pipe and the circulation pipe are all equipped with wind speed sensors, which can detect wind speed and / or wind pressure, and the wind speed sensors are electrically connected to the fan.

[0021] Beneficial effects: This utility model uses two sets of air separation devices to screen impurities in tobacco stems. Most of the tobacco shreds screened by the first air separation device and a small amount of tobacco shreds screened by the second air separation device are collected into the vertically installed main conveying pipe. The auxiliary conveying pipe sends the tobacco shreds into the main conveying pipe. The main conveying pipe can blow away the tobacco shreds while completing the conveying task through vertical air conveying, reducing the phenomenon of tobacco shreds stacking or piling up, and preventing the tobacco shreds from clogging in subsequent processing. Attached Figure Description

[0022] Figure 1 This is a front view of the secondary air separation system of this utility model;

[0023] Figure 2This is a side perspective view of the secondary air separation system of this utility model.

[0024] In the diagram: 1. First vibrating trough; 2. First air separator; 3. Main conveying pipe; 4. First conveyor belt; 41. Conveying section; 42. Lifting section; 5. Second vibrating trough; 6. Second air separator; 61. Vibrating screen; 7. Auxiliary conveying pipe; 8. Air inlet pipe; 9. Circulation pipe; 10. Fan; 11. First ejector; 12. Second ejector; 13. Third ejector; 14. Filter screen; 15. Dropper; 16. Cover plate. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] Under the current technology, due to the weak screening ability of the air classifier, a large amount of tobacco shreds will be wasted. Therefore, the air classifier needs to be used in conjunction with other types of screening devices. The air classifier is a secondary structure in the tobacco shred screening process, which assists in the screening of tobacco shreds. In this way, the tobacco shreds screened by the two sets of screening devices need to be collected together by a conveyor belt, which will cause the tobacco shreds to pile up. At the same time, the excessive number of conveyor belts will occupy the space in the factory area.

[0030] To solve the above problems, such as Figures 1 to 2 As shown, this utility model provides a secondary air separation system, including a feeding mechanism. The feeding mechanism of this utility model conveys tobacco stems to the first air separation device 2, where the first air separation device 2 performs screening. Most of the impurities fall downwards onto the first conveying device, while the tobacco is vertically sucked out upwards by the main conveying pipe 3. The first conveying device receives the tobacco stems discharged from the first air separation device 2 and conveys them to the second air separation device 6. After air separation, the second air separation device 6 sends the tobacco out from the auxiliary conveying pipe 7. A circulation pipe 9 is installed on the air inlet of the fan 10. A main conveying pipe 3 is vertically installed on the upper side of the first air separation device 2. The main conveying pipe 3 draws out the tobacco. An auxiliary conveying pipe 7 is installed on the upper side of the second air separation device 6. The auxiliary conveying pipe 7 also draws out the tobacco. The outlet end of the auxiliary conveying pipe 7 is connected to the circulation pipe 9, and the inlet end of the auxiliary conveying pipe 7 is connected to the second air separation device 6. The tobacco enters the auxiliary conveying pipe 7 and moves along the auxiliary conveying pipe 7 under the drive of the wind in the circulation pipe 9. A filter screen 14 is installed at the junction of the circulation pipe 9 and the auxiliary conveying pipe 7 to prevent the tobacco from entering the circulation pipe 9. The auxiliary conveying pipe 7 is also connected to the main conveying pipe 3.

[0031] Because this utility model uses two vertical air separation devices, the top of the first air separation device 2 and the second air separation device 6 are respectively equipped with a main conveying pipe 3 and an auxiliary conveying pipe 7. The working principle of the first air separation device 2 and the second air separation device 6 is the prior art and will not be described in detail here. The auxiliary conveying pipe 7 is connected to the main conveying pipe 3. Since the tobacco in the main conveying pipe 3 is drawn out by the main fan 10 in the factory area, the tobacco flows upward in the main conveying pipe 3 and the tobacco is relatively loose. At the same time, there is a strong airflow in the main conveying pipe 3, which can blow away the clumps or high-density tobacco. When the tobacco in the auxiliary conveying pipe 7 is conveyed to the main conveying pipe 3, the airflow can also disperse the tobacco, so that the tobacco in the main conveying pipe 3 can be completely dispersed. During the conveying process, the tobacco will not clump together, reducing the probability of blockage in subsequent processes. Meanwhile, the main conveying pipe 3 is vertically installed on the first air separation device 2, occupying only the vertical space within the factory area. The auxiliary conveying pipe 7 is directly connected to the main conveying pipe 3 in the air above the factory area, improving space utilization efficiency and freeing up more ground space in the factory area, thus reducing the footprint of the secondary air separation system. Furthermore, this invention employs a secondary air separation method to further screen the tobacco stems separated in the first air separation, increasing the amount of tobacco shreds removed and reducing tobacco waste.

[0032] The end of the auxiliary conveying pipe 7 is connected to the feeder 15, which collects the tobacco shreds flying out of the outlet of the auxiliary conveying pipe 7. The bottom of the feeder 15 is connected to the main conveying pipe 3. The feeder 15 can collect the tobacco shreds floating in the auxiliary conveying pipe 7 and then transport the collected tobacco shreds to the main conveying pipe 3. After the tobacco shreds reach the upper side of the feeder 15, due to the low wind force of the blower 10, energy consumption and noise can be reduced, and the tobacco shreds fall onto the feeder 15 on the lower side by their own gravity, so that the tobacco shreds can get away from the airflow control of the blower 10 and change their direction of movement.

[0033] The feeder 15 of this invention includes a collecting section, which forms a conical cavity. Tobacco shreds are collected at the bottom, and an observation window is installed on the side wall of the collecting section. The conical cavity allows for collection of tobacco shreds at the installation location, and the observation window allows observation of whether tobacco shreds have entered the feeder 15. The conical cavity then collects all the tobacco shreds to the bottom center, so that they can be thrown out by the subsequent feeder, thus preventing the accumulation of tobacco shreds.

[0034] The main working principle of the blower 10 is that after drawing in air, it is discharged from the other side of the blower 10. The air is drawn into the blower 10 through the circulation pipe 9 and then discharged by the blower 10. In this invention, an air inlet pipe 8 is installed on the lower side of the second air classifier 6, and a vibrating screen 61 is installed at the bottom of the second air classifier 6. An air inlet pipe 8 is installed on the lower side of the vibrating screen 61. The air inlet pipe 8 is connected to the circulation pipe 9. The blower 10 sends air from the circulation pipe 9 into the air inlet pipe 8, so that the air discharged by the blower 10 re-enters the second air classifier 6 as the air source for the second air classifier 6. Since the air discharged by the blower 10 has the kinetic energy of flow, it can meet the air classification requirements of the second air classifier 6. The air from the blower 10 can not only classify the tobacco, but also transport the tobacco selected by the second air classifier 6 to the feeder 15, realizing the secondary utilization of the blower 10. This allows the blower 10 to complete more tasks at low power and reduces system energy consumption.

[0035] The feeding mechanism includes a first feeder 11, and a first cylinder is installed on the side wall of the first air classifier 2. The first feeder 11 includes a first rotating blade and a first motor. The first rotating blade is circumferentially installed on the output shaft of the first motor. Adjacent first rotating blades and the inner wall of the first cylinder form a first receiving cavity. The first receiving cavities are isolated from each other. The first cylinder is also connected to the inside of the first air classifier 2.

[0036] The feeding mechanism also includes a first vibrating trough 1, which conveys tobacco stems into the first cylinder. The first vibrating trough 1 can loosen the tobacco stems more easily, making them more evenly distributed in each of the first receiving cavities, so that the tobacco stems eventually enter the first air classifier 2 evenly, thus improving the accuracy of tobacco air classification.

[0037] The first receiving cavity formed by the first rotating blade on the first feeder 11 rotates with the output shaft, throwing the tobacco stems that fall into the first receiving cavity into the screening cavity of the first air classifier 2. Heavier stems and impurities, as well as a small amount of tobacco, will fall onto the first conveying device below, while most of the tobacco will be sucked into the main conveying pipe 3, achieving the first screening of the tobacco stems. Each first rotating blade abuts against the inner wall of the first cylinder, so that the screening cavity of the first air classifier 2 is connected to the outside only through the lower opening. The first cylinder can isolate the inside and outside of the first air classifier 2, so that the airflow enters from the lower opening of the first air classifier 2 and flows from bottom to top, avoiding air leakage from the first cylinder to the inside, improving the air classification effect, reducing the working power of the main fan 10 in the plant area, reducing noise, and saving energy.

[0038] The first conveying device includes a first conveyor belt 4 and a second vibrating trough 5. The first conveyor belt 4 includes a conveying section 41 and a lifting section 42. The conveying section 41 is installed below the outlet of the first air classifier 2. The lifting section 42 is inclinedly connected to one end of the conveying section 41. The second vibrating trough 5 is installed below the lifting section 42. The second vibrating trough 5 receives tobacco stems that fall from the top of the lifting section 42 and conveys the tobacco stems into the second air classifier 6.

[0039] The conveying section 41 transports the tobacco stems screened by the first air separation device 2 to the highest point of the lifting section, and finally lifts the tobacco stems to the upper side through the lifting section 42, and transports the tobacco stems into the second vibrating groove 5. The second vibrating groove 5 can shake the tobacco stems again, making it easier for the tobacco to be selected in the second air separation device 6, realizing the second air separation of the tobacco, recovering more tobacco, and reducing economic losses.

[0040] The second cylinder and the second feeder 12 are installed on the side wall of the second air separation device 6. The second feeder 12 includes a second rotating blade and a second motor. The output shaft of the second motor is circumferentially equipped with the second rotating blade. Adjacent second rotating blades and the inner wall of the second cylinder form a second receiving cavity. The second receiving cavities are isolated from each other. The second cylinder is also connected to the second air separation device 6. The second vibrating groove 5 conveys tobacco stems into the second cylinder.

[0041] After the second receiving cavity receives the tobacco stems, it will throw the tobacco stems into the second air separator 6. The tobacco stems will be evenly dispersed, and the stem impurities will fall downwards, improving the air separation effect. The tobacco will move upwards along the auxiliary conveying pipe 7, while the impurities will fall downwards and eventually be discharged to the outside. The second rotating blades abut against the inner wall of the second cylinder to seal the second air separator 6, so that the airflow can only enter from the bottom of the second air separator 6, improving the airtightness of the air separation cavity of the second air separator 6, and allowing the tobacco stems to be quickly separated into upper and lower streams after entering.

[0042] The bottom of the feeder 15 of this utility model is equipped with a third cylinder, and a third feeder 13 is installed on the third cylinder. The third feeder 13 includes a third rotating blade and a third motor. The output shaft of the third motor is circumferentially equipped with the third rotating blade. Adjacent third rotating blades and the inner wall of the third cylinder form a third receiving cavity. The third receiving cavities are isolated from each other. The third cylinder is also connected to the main conveying pipe 3.

[0043] After the tobacco enters the feeder 15 from the auxiliary conveying pipe 7, it enters the third cylinder. The third cylinder starts to rotate under the drive of the third motor. The third rotating blade throws the tobacco into the main conveying pipe 3. The tobacco from the secondary air separation can move along the main conveying pipe 3 to the next process. Similarly, the third rotating blade can isolate the first air separation device 2 from the outside world, preventing air leakage into the first air separation device 2. This allows the airflow inside the first air separation device 2 to be completely drawn in from its lower side, so that the tobacco can be carried upward after entering the main conveying pipe 3.

[0044] The main conveying pipe 3 has an opening on its side wall. A bolt is rotatably mounted on the upper side of the opening, and a cover plate 16 is fixed to the bolt. The cover plate 16 covers the opening. Rotating the bolt changes the overlapping area between the cover plate 16 and the opening. The larger the exposed area of ​​the opening, the more outside air can be introduced into the inner wall of the main conveying pipe 3. This allows for adjustment of the air intake for different types of tobacco. The larger the exposed area of ​​the opening, the greater the air intake, enabling the first air separator 2 to convey tobacco of different specifications. A damper can also be installed on the second air separator 6, which can also be used to adjust the air intake.

[0045] The main delivery pipe 3, the delivery pipe, and the circulation pipe 9 are all equipped with wind speed sensors. The wind speed sensors can detect wind speed and / or wind pressure, and are electrically connected to the fan 10. The wind speed sensors can monitor the air volume or wind speed inside the pipeline in real time, and can adjust the operating frequency of the fan 10 so that the air volume or wind speed inside the pipeline can operate under the set requirements.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A secondary air separation system, characterized in that, include: The feeding mechanism conveys tobacco stems; The first air separation device (2) is a feeding mechanism that transports the tobacco stems into the first air separation device (2). A first conveying device receives the tobacco stems discharged from the first air separation device (2); The second air separation device (6) is used to transport the tobacco stems into the second air separation device (6) by the first conveying device. A fan (10) is provided with a circulation pipe (9) installed on its air inlet. The first air separation device (2) has a main conveying pipe (3) vertically installed on its upper side. The main conveying pipe (3) draws out the tobacco. The second air separation device (6) has an auxiliary conveying pipe (7) installed on its upper side. The auxiliary conveying pipe (7) draws out the tobacco. The auxiliary conveying pipe (7) is connected to the circulation pipe (9). A filter screen (14) is installed at the junction of the circulation pipe (9) and the auxiliary conveying pipe (7). The auxiliary conveying pipe (7) is also connected to the main conveying pipe (3).

2. The secondary air separation system according to claim 1, characterized in that, The end of the auxiliary conveying pipe (7) is connected to the feeder (15), which collects the tobacco shreds in the auxiliary conveying pipe (7). The bottom of the feeder (15) is connected to the main conveying pipe (3).

3. The secondary air separation system according to claim 2, characterized in that, The feeder (15) includes a collection section, which is surrounded by a conical cavity. The tobacco shreds are collected at the bottom, and an observation window is installed on the side wall of the collection section.

4. The secondary air separation system according to claim 1, characterized in that, The bottom of the second air separation device (6) is equipped with a vibrating screen (61), and an air inlet pipe (8) is installed on the lower side of the vibrating screen (61). The air inlet pipe (8) is connected to the circulation pipe (9), and the fan (10) sends air into the air inlet pipe (8).

5. The secondary air separation system according to claim 1, characterized in that, The feeding mechanism includes a first feeder (11), and a first cylinder is installed on the side wall of the first air classifier (2). The first feeder (11) includes a first rotating blade and a first motor. The first rotating blade is circumferentially installed on the output shaft of the first motor. Adjacent first rotating blades and the inner wall of the first cylinder form a first receiving cavity. The first receiving cavities are isolated from each other. The first cylinder is also connected to the inside of the first air classifier (2). The feeding mechanism also includes a first vibrating groove (1), which conveys the tobacco stems into the first cylinder.

6. The secondary air separation system according to claim 1, characterized in that, The first conveying device includes a first conveyor belt (4) and a second vibrating trough (5). The first conveyor belt (4) includes a conveying section (41) and a lifting section (42). The conveying section (41) is installed below the outlet of the first air separator (2). The lifting section (42) is inclinedly connected to one end of the conveying section (41). The second vibrating trough (5) is installed below the lifting section (42). The second vibrating trough (5) receives the tobacco stems that fall from the top of the lifting section (42). The second vibrating trough (5) conveys the tobacco stems into the second air separator (6).

7. The secondary air separation system according to claim 6, characterized in that, The second air classifier (6) has a second cylinder and a second feeder (12) installed on its side wall. The second feeder (12) includes a second rotating blade and a second motor. The output shaft of the second motor is circumferentially mounted with the second rotating blade. Adjacent second rotating blades and the inner wall of the second cylinder form a second receiving cavity. The second receiving cavities are isolated from each other. The second cylinder is also connected to the second air classifier (6). The second vibration groove (5) conveys the tobacco stems into the second cylinder.

8. The secondary air separation system according to claim 2, characterized in that, The bottom of the feeder (15) is equipped with a third cylinder, and a third feeder (13) is installed on the third cylinder. The third feeder (13) includes a third rotating blade and a third motor. The output shaft of the third motor is circumferentially equipped with the third rotating blade. Adjacent third rotating blades and the inner wall of the third cylinder form a third receiving cavity. The third receiving cavities are isolated from each other. The third cylinder is also connected to the main conveying pipe (3).

9. The secondary air separation system according to claim 1, characterized in that, The main conveying pipe (3) has an opening on its side wall. A bolt is rotatably installed on the upper side of the opening, and a cover plate (16) is fixed on the bolt. The cover plate (16) covers the opening.

10. The secondary air separation system according to claim 1, characterized in that, The main delivery pipe (3), the delivery pipe and the circulation pipe (9) are all equipped with wind speed sensors. The wind speed sensors can detect wind speed and / or wind pressure. The wind speed sensors are electrically connected to the fan (10).

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