Tower type airflow cut tobacco dryer system

Abstract

The invention provides a tower type airflow cut tobacco dryer system which comprises a burner, a cut tobacco drying tower and a gas-material separator, a cut tobacco feeding port, a first gas inlet and a cut tobacco discharging port are formed in the cut tobacco drying tower, the gas-material separator comprises a shell, a feeding port of the gas-material separator is communicated with the cut tobacco discharging port of the cut tobacco drying tower, and a second gas inlet is formed in the shell. A screening device is arranged at an air outlet of the air-material separator and comprises a screening pipe, an air outlet pipe and a vibrator, one end of the air outlet pipe extends into an inner cavity of the air-material separator through the air outlet and is connected with the screening pipe, and the outer diameter of the air outlet pipe is smaller than the hole diameter of the air outlet. Flexible connection and sealing between the air outlet pipe and the shell are achieved through the first flexible connecting piece, the pipe section, extending out of the shell, of the air outlet pipe is an extending section, the outer side of the extending section of the air outlet pipe is connected with the vibrator, the vibrator drives the air outlet pipe to vibrate, and therefore the screening pipe is driven to vibrate. Compared with the prior art, the device has the advantages that vibration of the air outlet pipe is achieved through the vibrator, and screening holes of the air outlet pipe are prevented from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco processing equipment, and more specifically to a tower type airflow tobacco drying machine system. Background Art

[0002] The tower airflow dryer is an important part of the tobacco production system. It uses high-temperature convection gas to quickly dry the moisture in the tobacco, so that the tobacco reaches the required moisture content, removes impurities in the tobacco, increases the filling value of the tobacco, and improves the quality of the tobacco. At the tail end of the tobacco drying system, an air-material separator is usually required to separate the airflow mixed with tobacco particles to achieve the complete process of tobacco airflow drying. However, the fine tobacco particles and dust that are broken during the drying process can easily cause the sieve holes of the air outlet duct in the separator to be blocked, destroying the control stability of the process air circulation system, and thus affecting the uniformity of the moisture content of the exported tobacco. Summary of the invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a tower airflow tobacco drying machine system. By arranging a vibrator in the screening device, the air outlet pipe of the gas-material separator is vibrated, thereby avoiding blockage of the sieve holes of the air outlet pipe and improving the stability of the process air control system.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A tower-type airflow wire drying machine system comprises a burner, a wire drying tower and an air-material separator. The wire drying tower is provided with a tobacco feed port, a first air inlet and a tobacco discharge port. The air-material separator comprises a shell body. The shell body is provided with a feed port, an air outlet and a tobacco drop port. The feed port of the air-material separator is communicated with the tobacco discharge port of the wire drying tower. A screening device is provided at the air outlet of the air-material separator. The screening device comprises a screening pipe, an air outlet pipe and a vibrator. One end of the air outlet pipe extends into an inner cavity of the shell body through the air outlet and is connected to the screening pipe, and the other end of the air outlet pipe extends out of the shell body. The outer diameter of the air outlet pipe is smaller than the aperture of the air outlet. A flexible connection between the air outlet pipe and the shell body is achieved by a first flexible connector, and the gap between the air outlet pipe and the air outlet of the shell body is sealed by the first flexible connector. The pipe section of the air outlet pipe extending out of the shell body is an extended section. The outer side of the extended section of the air outlet pipe is connected to a vibrator, and the air outlet pipe is driven to vibrate by the vibrator, thereby driving the screening pipe to vibrate.

[0006] As a preferred embodiment of the above-mentioned tower-type airflow tobacco drying machine system, the tobacco drying tower includes a tower body and a tower cap located at the upper end of the tower body, a tobacco feed port is arranged on the tower body, and a tobacco discharge port is arranged on the tower cap, and the tower cap includes a top wall section and a side wall section arranged up and down, the top wall section is a right-angle pipe section structure formed by a vertical section and a horizontal section, and there is an arc transition between the vertical section and the horizontal section of the top wall section, the horizontal section of the top wall section gradually shrinks from one end close to the vertical section, and the tobacco discharge port is arranged at the shrinking end of the horizontal section of the top wall section.

[0007] As a preferred solution of the above-mentioned tower airflow tofu drying machine system, the side wall section of the tower cap includes a straight section and an expansion section connected up and down, the expansion section is an expansion section that gradually expands from bottom to top, the bottom end of the expansion section is connected to the top of the tower body, and the top of the straight section is connected to the bottom end of the side wall section of the tower cap.

[0008] As a preferred solution of the above-mentioned tower-type airflow silk drying machine system, the air outlet pipe includes a first air outlet pipe and a second air outlet pipe, the head end of the first air outlet pipe is connected to the screening pipe, and a flexible connection is achieved between the end of the first air outlet pipe and the head end of the second air outlet pipe through a second flexible connector, and the vibrator is arranged on the first air outlet pipe.

[0009] As a preferred solution of the tower-type airflow tobacco drying machine system, it also includes a material leveler and a vibration trough, wherein the inlet end of the vibration trough is connected to the outlet end of the material leveler, and the outlet end of the vibration trough is connected to the tobacco feed inlet of the tobacco drying tower.

[0010] As a preferred solution of the tower-type airflow tobacco drying machine system, it also includes an expansion device, the outlet end of the expansion device is connected to the tobacco feed port of the tobacco drying tower, and the inlet end of the expansion device is connected to the discharge port of the vibration trough.

[0011] As a preferred solution of the above-mentioned tower airflow wire drying machine system, it also includes a burner, which is provided with a second air inlet and an exhaust port, the air outlet of the gas-material separator is connected to the second air inlet of the burner, and the exhaust port of the burner is connected to the first air inlet of the wire drying tower.

[0012] As a preferred solution of the tower airflow torrefaction drying system, the exhaust port of the burner is also connected to an expansion device, and the outlet end of the vibration groove is arranged on the air pipe between the exhaust port and the expansion device.

[0013] As a preferred embodiment of the above-mentioned tower-type airflow tobacco drying machine system, the exhaust port of the burner is connected to the expansion device through a first air pipe, and a bypass ejector air pipe is provided on the first air pipe. The ejector air pipe is connected in parallel with the expansion device, and the end of the ejector air pipe extends upward at an angle and is connected to the tobacco feed port of the tobacco drying tower.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The present invention provides a tower-type airflow tobacco drying machine system, which is provided with a vibrator in the screening device of the airflow tobacco drying machine, and utilizes the high-frequency oscillation characteristics of the vibrator, so that the screening tube of the screening device can always be in a vibrating state, so as to prevent the filter holes of the screening tube from being blocked by fine particles and dust in the tobacco airflow mixture, thereby improving the stability of the process wind control system and reducing the difference in the uneven distribution of the moisture content of tobacco drying caused by it. In addition, the present invention improves the tower cap structure of the tobacco drying tower, designs the top wall section of the tower cap as a right-angle pipe section structure with arc transition and gradually shrinks toward the direction of the tobacco discharge port, so that the particle movement in the tobacco drying tower collides less with the side and top of the tower body, and there is no swirl phenomenon that affects the particle movement, which can effectively improve the uniformity of the tobacco airflow movement, and the particle movement trajectory is evenly dispersed and has good movement consistency, which is conducive to ensuring the uniformity of the moisture content of the tobacco after drying and improving the quality of the tobacco. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the screening device part of the gas-material separator of the present invention.

[0018] Figure 3 It is a structural schematic diagram of a fiber drying tower of the present invention.

[0019] Figure 4 It is a simulation trajectory diagram of the movement of tobacco particles in the tobacco drying tower of the present invention simulated by ANSYS simulation software.

[0020] Figure 5 This is a simulation trajectory diagram of the movement of tobacco particles in a traditional tobacco drying tower using ANSYS simulation software.

[0021] In the figure, 1 is a burner; 2 is a tobacco drying tower; 3 is an air-material separator; 4 is a tobacco feed port; 5 is a first air inlet; 6 is a tobacco discharge port; 7 is a shell; 8 is a screening device; 9 is a screening tube; 10 is a vibrator; 11 is a first flexible connector; 12 is a first air outlet pipe; 13 is a second air outlet pipe; 14 is a second flexible connector; 15 is a material equalizer; 16 is a vibration trough; 17 is an expansion device; 18 is a first air pipe; 19 is an ejection air pipe; 20 is a tower body; 21 is a top wall section; 22 is a straight section; 23 is an expansion section. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 5 The present embodiment provides a tower-type airflow tobacco drying machine system, including a burner 1, a tobacco drying tower 2, and an air-material separator 3. The tobacco drying tower 2 is provided with a tobacco feed port 4, a first air inlet 5, and a tobacco discharge port 6. The air-material separator 3 includes a shell 7, and the shell 7 is provided with a feed port, an air outlet, and a tobacco drop port. The feed port of the air-material separator 3 is connected to the tobacco discharge port 6 of the tobacco drying tower 2. A screening device 8 is provided at the air outlet of the air-material separator 3. The screening device 8 includes a screening pipe 9, an air outlet pipe, and a vibrator 10. One end of the air outlet pipe is connected to the screening device 8. The air outlet extends into the inner cavity of the shell 7 and is connected to the screening tube 9. The other end of the air outlet pipe extends out of the shell 7. The outer diameter of the air outlet pipe is smaller than the aperture of the air outlet. The flexible connection between the air outlet pipe and the shell 7 is achieved through the first flexible connector 11, and the gap between the air outlet pipe and the air outlet of the shell 7 is sealed through the first flexible connector 11. The pipe section of the air outlet pipe extending out of the shell 7 is the extended section. The outer side of the extended section of the air outlet pipe is connected to a vibrator 10, and the air outlet pipe is driven to vibrate by the vibrator 10, thereby driving the screening tube 9 to vibrate. The air outlet pipe includes a first air outlet pipe 12 and a second air outlet pipe 13. The head end of the first air outlet pipe 12 is connected to the screening tube 9. The end of the first air outlet pipe 12 and the head end of the second air outlet pipe 13 are flexibly connected through a second flexible connector 14. The vibrator 10 is arranged on the first air outlet pipe 12.

[0024] The tower airflow tobacco drying machine system also includes a material leveler 15, a vibration trough 16, an expansion device 17 and a burner 1. The inlet end of the vibration trough 16 is connected to the discharge port of the material leveler 15, and the outlet end of the vibration trough 16 is connected to the tobacco feed port 4 of the drying tower 2. The outlet end of the expansion device 17 is connected to the tobacco feed port 4 of the drying tower 2, and the inlet end of the expansion device 17 is connected to the discharge port of the vibration trough 16. The burner 1 is provided with a second air inlet and an exhaust port, the air outlet of the gas-material separator 3 is connected to the second air inlet of the burner 1, and the exhaust port of the burner 1 is connected to the first air inlet 5 of the drying tower 2. The exhaust port of the burner 1 is also connected to the expansion device 17, and the outlet end of the vibration trough 16 is arranged on the air pipe between the exhaust port and the expansion device 17. The exhaust port of the burner 1 is connected to the expansion device 17 through the first air pipe 18. A bypass ejector air pipe 19 is provided on the first air pipe 18. The ejector air pipe 19 is connected in parallel with the expansion device 17. The end of the ejector air pipe 19 extends upward at an angle and is connected to the tobacco feed port 4 of the drying tower 2.

[0025] When in use, the tobacco is loosened by the material distributor 15, enters the vibration trough 16 for further loosening, and then enters the expansion device 17. In the expansion device 17, part of the process gas mixed steam is mixed with the tobacco, and the tobacco fully absorbs moisture and expands in the expansion device 17 and is pushed to the tobacco feed port 4 under the action of the hot air flow jet output by the burner 1; at the same time, the induced gas is transported obliquely upward to the tobacco feed port 4 of the drying tower 2 through the end of the induced air pipe 19, which can effectively avoid blockage of the tobacco feed port 4. The burner 1 provides high-temperature gas, a part of which enters the drying tower 2 through the first air inlet 5 at the bottom of the drying tower 2. The tobacco feed port 4 on the side wall of the drying tower 2 continuously feeds pre-dried tobacco. In the process of the hot air flow flowing from bottom to top, the hot air flow can meet and mix with the tobacco entering the tower body 20, driving the tobacco to flow from bottom to top, realizing the gas phase transportation of the tobacco upward. At the same time, the high-temperature air flow takes away the moisture in the tobacco, realizing the rapid drying of the tobacco. Finally, the dried tobacco is discharged from the drying tower 20. The tobacco shreds leave the outlet 6 on one side of the top of the tobacco tower 2, and the tobacco shreds and the hot air flow enter the gas-material separator 3 together, and the gas and material are separated in the gas-material separator 3. The separated tobacco shreds leave through the tobacco drop outlet and enter the next process; the separated gas leaves the gas-material separator 3 through the gas outlet and enters the burner 1, and is heated in the burner 1. The heated hot air can be circulated for drying the tobacco shreds, which is equivalent to recovering the waste heat in the gas, so as to improve the energy utilization rate and reduce the unit loss during tobacco drying.

[0026] In the gas-material separator 3, when the airflow leaves the gas-material separator 3 through the air outlet, the fine tobacco particles and dust broken during the drying process will follow the gas flow into the air outlet pipe, and the wet particles and dust are easy to gather in the air outlet pipe or at the pipe mouth, thereby causing the air outlet pipe to be blocked, destroying the control stability of the process air circulation system, and further affecting the uniformity of the moisture content of the outlet tobacco. For this reason, by setting a screen tube 9 at one end of the air outlet pipe extending into the shell 7, the particles and dust can be filtered outside the screen tube 9, thereby avoiding blocking the air outlet pipe. At the same time, in order to avoid particles and dust blocking the filter holes of the screen tube 9, the high-frequency oscillation characteristics of the vibrator 10 are used, so that the screen tube 9 can always be in a vibrating state, avoiding the filter holes of the screen tube 9 from being blocked by fine particles and dust in the tobacco airflow mixture, thereby improving the stability of the process wind control system and reducing the difference in the uneven distribution of the moisture content of the tobacco drying caused by it.

[0027] Since the vibrator 10 acts directly on the air outlet pipe, and the air outlet pipe is arranged at the air outlet, in order to avoid stress or collision between the vibrating air outlet pipe and the hole wall of the air outlet, the outer diameter of the air outlet pipe needs to be designed to be smaller than the hole diameter of the air outlet. However, such a structure will cause a large gap between the air outlet pipe and the air outlet. Therefore, by setting the first flexible connector 11, it can play a role of flexible sealing to prevent the air flow in the gas-material separation from leaving through the gap between the air outlet pipe and the air outlet. Since the vibrator 10 will oscillate at a high frequency when vibrating, in order to avoid the vibration effect of the vibrator 10 from being continuously transmitted to the subsequent air outlet pipe, the air outlet pipe near the vibrator 10 is divided into two parts, and then the two parts are connected by the second flexible connector 14. In this way, the second flexible connector 14 can not only achieve the sealing between the first air outlet pipe 12 and the second air outlet pipe 13, but also greatly reduce the vibration force transmitted from the first air outlet pipe 12 to the second air outlet pipe 13, thereby improving the service life of the second air outlet pipe 13.

[0028] Among them, the first flexible connector 11 and the second flexible connector 14 can be any one of canvas connectors, silicone connectors, and silicone rubber connectors. Canvas has good waterproof properties and is strong and durable, which is beneficial to reducing the cost of use. Silicone and silicone rubber are more environmentally friendly and are beneficial to ensuring the safety of tobacco.

[0029] The tobacco drying tower 2 includes a tower body 20 and a tower cap located at the upper end of the tower body 20, a first air inlet 5 is arranged at the bottom end of the tower body 20, a tobacco feed port 4 is arranged at a position near the bottom end on one side of the tower body 20, and a tobacco discharge port 6 is arranged at a position near the top end on one side of the tower cap. The tower cap includes a top wall section 21 and a side wall section arranged up and down, the top wall section 21 is a right-angle tube section structure formed by a vertical section and a horizontal section, and the vertical section and the horizontal section of the top wall section 21 are in an arc transition, the horizontal section of the top wall section 21 gradually shrinks from one end close to the vertical section, and the tobacco discharge port 6 is arranged at the shrinking end of the horizontal section of the top wall section 21. The side wall section of the tower cap includes a straight section 22 and an expansion section 23 connected up and down, the expansion section 23 is an expansion section that gradually expands from bottom to top, the bottom end of the expansion section 23 is connected to the top end of the tower body 20, and the top end of the straight section 22 is connected to the bottom end of the side wall section of the tower cap.

[0030] In the traditional structure of the drying tower 2, the top of the drying tower 2 is a right-angled side wall, which causes an uneven flow field in the top area of ​​the drying tower 2, affects the residence time of the tobacco, and ultimately causes a large difference in the uniformity of tobacco drying. Specifically, since the axis of the tobacco feed port 4 is perpendicular to the axis of the first air inlet 5, the tobacco moves upward to the top area of ​​the tower, and the movement trajectory changes due to the collision at the top of the tower body 20 and the uneven flow field, resulting in a large difference in the residence time of the tobacco in the drying tower 2, which in turn causes differences in the degree of tobacco drying, causing the problem of uneven distribution of tobacco moisture content.

[0031] Compared with the traditional drying tower 2 structure, in this embodiment, the top wall section 21 of the tower cap is designed as a right-angle pipe section structure with an arc transition. The arc-shaped top wall structure can make the airflow pass through the top corner area of ​​the drying tower 2 more smoothly, avoiding the problem of tobacco overdrying caused by the swirl of the airflow at the top of the tower, which is conducive to more uniform drying of the tobacco. At the same time, the side wall section of the tower cap includes a gradually expanding expansion section 23, which is equivalent to expanding the inner diameter of the tower cap, so as to leave a larger diffusion space for the tobacco airflow, reduce the probability of contact or collision between the tobacco airflow and the side wall of the tower cap, and avoid the phenomenon of change in the motion trajectory caused by the collision between the tobacco and the side wall, which is conducive to more consistent movement trajectory of the tobacco, ensuring more consistent residence time for tobacco drying, and also ensuring more consistent degree of drying, and finally improving the uniformity of moisture content distribution of the tobacco.

[0032] The applicant used ANSYS simulation software to simulate the trajectory of tobacco particles in the tobacco drying tower 2 of the present invention and the traditional tobacco drying tower 2, respectively, and obtained a simulated trajectory diagram of tobacco particles. Figure 4 It is a simulation trajectory diagram of the movement of tobacco particles in the tobacco drying tower 2 of the present invention simulated by ANSYS simulation software. Figure 5 This is a simulation trajectory diagram of the movement of tobacco particles in a traditional tobacco drying tower 2 simulated by ANSYS simulation software.

[0033] After comparison Figure 4 and Figure 5 It can be seen from the trajectory of tobacco particles in the traditional structure of the drying tower 2 that in the particle movement trajectory, there are collisions that affect the movement trajectory of most particles and swirl phenomena in the movement trajectory of a small number of particles near the top of the drying tower 2. The drying tower 2 provided by the embodiment of the present invention redesigns the top wall section 21 of the tower cap of the drying tower 2 to have a smooth transition and gradually shrink toward the tobacco discharge port 6. The particle movement in the drying tower 2 collides less with the side and top of the tower body 20, and there is no swirl phenomenon that affects the movement of particles. The uniformity of the airflow movement of tobacco can be effectively improved, and the particle movement trajectory is evenly dispersed and has good movement consistency, which is conducive to ensuring the uniformity of the moisture content of tobacco after drying, improving the quality of tobacco, and improving the refined processing level of the tower airflow drying machine.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tower-type airflow tobacco drying machine system, comprising a burner (1), a tobacco drying tower (2), and an air-material separator (3), wherein the tobacco drying tower (2) is provided with a tobacco feed port (4), a first air inlet (5), and a tobacco discharge port (6), the air-material separator (3) comprises a shell (7), the shell (7) is provided with a feed port, an air outlet, and a tobacco discharge port, the feed port of the air-material separator (3) is connected to the tobacco discharge port (6) of the tobacco drying tower (2), and characterized in that: A screening device (8) is provided at the air outlet of the gas-material separator (3), and the screening device (8) comprises a screening tube (9), an air outlet pipe and a vibrator (10). One end of the air outlet pipe extends into the inner cavity of the shell (7) through the air outlet and is connected to the screening tube (9), and the other end of the air outlet pipe extends out of the shell (7). The outer diameter of the air outlet pipe is smaller than the aperture of the air outlet. A flexible connection between the air outlet pipe and the shell (7) is achieved through a first flexible connector (11), and a gap between the air outlet pipe and the air outlet of the shell (7) is sealed through the first flexible connector (11). The pipe section of the air outlet pipe extending out of the shell (7) is a protruding section. The outer side of the protruding section of the air outlet pipe is connected to the vibrator (10), and the air outlet pipe is driven to vibrate through the vibrator (10), thereby driving the screening tube (9) to vibrate.

2. A tower type airflow tofu drying system as claimed in claim 1, characterized in that: The tobacco drying tower (2) comprises a tower body (20) and a tower cap located at the upper end of the tower body (20); a tobacco feed port (4) is arranged on the tower body (20); a tobacco discharge port (6) is arranged on the tower cap; the tower cap comprises a top wall section (21) and a side wall section arranged up and down; the top wall section (21) is a right-angled tube section structure formed by a vertical section and a horizontal section; the vertical section and the horizontal section of the top wall section (21) are in a circular arc transition; the horizontal section of the top wall section (21) gradually shrinks from one end close to the vertical section; and the tobacco discharge port (6) is arranged at the shrinking end of the horizontal section of the top wall section (21).

3. A tower type airflow tofu drying system as claimed in claim 2, characterized in that: The side wall section of the tower cap comprises a straight section (22) and an expansion section (23) connected up and down, the expansion section (23) is an expansion section that expands gradually from bottom to top, the bottom end of the expansion section (23) is connected to the top end of the tower body (20), and the top end of the straight section (22) is connected to the bottom end of the side wall section of the tower cap.

4. A tower type airflow tofu drying system as claimed in claim 1, characterized in that: The air outlet pipe comprises a first air outlet pipe (12) and a second air outlet pipe (13); the head end of the first air outlet pipe (12) is connected to the screening pipe (9); the end of the first air outlet pipe (12) and the head end of the second air outlet pipe (13) are flexibly connected via a second flexible connector (14); and the vibrator (10) is arranged on the first air outlet pipe (12).

5. The tower type airflow tofu drying system according to claim 1, characterized in that: It also includes a material leveler (15) and a vibration trough (16), wherein the inlet end of the vibration trough (16) is connected to the outlet of the material leveler (15), and the outlet end of the vibration trough (16) is connected to the tobacco feed port (4) of the drying tower (2).

6. A tower type airflow tofu drying system as claimed in claim 5, characterized in that: It also includes an expansion device (17), the outlet end of the expansion device (17) is connected to the tobacco feed port (4) of the drying tower (2), and the inlet end of the expansion device (17) is connected to the discharge port of the vibration trough (16).

7. A tower type airflow tofu drying system as claimed in claim 6, characterized in that: It also comprises a burner (1), the burner (1) being provided with a second air inlet and an exhaust port, the air outlet of the gas-material separator (3) being connected to the second air inlet of the burner (1), and the exhaust port of the burner (1) being connected to the first air inlet (5) of the drying tower (2).

8. A tower type airflow tofu drying system as claimed in claim 7, characterized in that: The exhaust port of the burner (1) is also connected to the expansion device (17), and the outlet end of the vibration groove (16) is arranged on the air pipe between the exhaust port and the expansion device (17).

9. A tower type airflow tofu drying system as claimed in claim 8, characterized in that: The exhaust port of the burner (1) is connected to the expansion device (17) through a first air pipe (18). A bypass ejector air pipe (19) is provided on the first air pipe (18). The ejector air pipe (19) is connected in parallel with the expansion device (17). The end of the ejector air pipe (19) extends upward at an angle and is connected to a tobacco feed port (4) of a drying tower (2).

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