Tower type airflow cut tobacco dryer system

Abstract

The utility model provides a tower type airflow cut tobacco dryer system, which comprises a burner, a cut tobacco drying tower and a gas-material separator, the cut tobacco drying tower is provided with a cut tobacco feed port, a first air inlet and a cut tobacco discharge port, the gas-material separator comprises a shell, the feed port of the gas-material separator is communicated with the cut tobacco discharge port of the cut tobacco drying tower, and the first air inlet is communicated with the cut tobacco discharge port of the cut tobacco drying tower. 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 air outlet pipe has the advantages that the vibration of the air outlet pipe is realized through the vibrator, and the sieve pores of the air outlet pipe are prevented from being blocked.

Description

Technical Field

[0001] This utility model relates to the field of tobacco processing equipment technology, and more specifically to a tower-type airflow drying machine system. Background Technology

[0002] Tower-type airflow drying machines are an important component of tobacco production systems. They utilize high-temperature convective gas to rapidly dry the moisture in tobacco shreds, achieving the required moisture content, removing impurities, increasing the filling value, and improving tobacco quality. At the end of this tobacco drying system, a gas-material separator is typically used to separate the airflow containing tobacco particles, completing the entire airflow drying process. However, fine tobacco particles and dust generated during the drying process can easily clog the sieve holes in the separator's outlet duct, disrupting the stability of the process air circulation system and consequently affecting the uniformity of the moisture content of the exiting tobacco shreds. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tower-type airflow drying machine system. By setting a vibrator in the screening device, the air outlet pipe of the air-material separator is vibrated, thereby avoiding the clogging of the screen holes in the air outlet pipe and improving the stability of the process air control system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A tower-type airflow tobacco drying machine system includes a burner, a drying tower, and a gas-material separator. The drying tower is provided with a tobacco feed inlet, a first air inlet, and a tobacco discharge outlet. The gas-material separator includes a shell with a feed inlet, an air outlet, and a tobacco discharge outlet. The feed inlet of the gas-material separator is connected to the tobacco discharge outlet of the drying tower. A screening device is provided at the air outlet of the gas-material separator. The screening device includes a screening pipe, an air outlet pipe, and a vibrator. One end of the air outlet pipe extends into the inner cavity of the shell through the air outlet and is connected to the screening pipe. The other end of the air outlet pipe extends out of the shell. The outer diameter of the air outlet pipe is smaller than the diameter of the air outlet. A first flexible connector is used to achieve a flexible connection between the air outlet pipe and the shell, and to seal the gap between the air outlet pipe and the air outlet of the shell. The section of the air outlet pipe extending out of the shell is called the extension section. The vibrator is connected to the outside of the extension section of the air outlet pipe. The vibrator drives the air outlet pipe to vibrate, thereby driving the screening pipe to vibrate.

[0006] As a preferred embodiment of the above-mentioned tower-type airflow drying machine system, the drying tower includes a tower body and a tower cap located at the upper end of the tower body. The tobacco feed inlet is located on the tower body, and the tobacco discharge outlet is located on the tower cap. The tower cap includes a top wall section and a side wall section arranged vertically. The top wall section is a right-angle tube structure formed by a vertical section and a horizontal section, and the vertical section and the horizontal section of the top wall section transition with an arc. The horizontal section of the top wall section gradually narrows from the end closest to the vertical section, and the tobacco discharge outlet is located at the narrowed end of the horizontal section of the top wall section.

[0007] As a preferred embodiment of the above-mentioned tower-type airflow drying machine system, the side wall section of the tower cap includes a straight section and an expansion section connected vertically. The expansion section is an expansion section that gradually widens from bottom to top. The bottom end of the expansion section is connected to the top end of the tower body, and the top end of the straight section is connected to the bottom end of the side wall section of the tower cap.

[0008] As a preferred embodiment of the above-mentioned tower-type airflow drying machine system, the air outlet pipe includes a first air outlet pipe and a second air outlet pipe. The first air outlet pipe is connected to the screening pipe at its head end, and the first air outlet pipe and the second air outlet pipe are flexibly connected by a second flexible connector. The vibrator is installed on the first air outlet pipe.

[0009] As a preferred embodiment of the above-mentioned tower-type airflow drying machine system, it also includes a feed equalizer and a vibrating trough. The inlet end of the vibrating trough is connected to the outlet of the feed equalizer, and the outlet end of the vibrating trough is connected to the tobacco feed inlet of the drying tower.

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

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

[0012] As a preferred embodiment of the above-mentioned tower-type airflow drying machine system, the exhaust port of the burner is also connected to the expansion device, and the outlet end of the vibrating groove is located on the air pipe between the exhaust port and the expansion device.

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

[0014] Compared with existing technologies, the beneficial effects of this utility model are reflected in:

[0015] This invention provides a tower-type airflow drying machine system. A vibrator is installed in the screening device of the airflow drying machine. Utilizing the high-frequency oscillation characteristics of the vibrator, the screening tube of the screening device is constantly vibrating, preventing the filter pores of the screening tube from being blocked by fine particles and dust in the tobacco-airflow mixture. This improves the stability of the process air control system and reduces the uneven distribution of moisture content in the dried tobacco. Furthermore, this invention improves the tower cap structure of the drying tower. The top wall section of the tower cap is designed as a right-angled tube with a rounded transition, gradually narrowing towards the tobacco outlet. This reduces collisions between particles moving within the drying tower and the sides and top of the tower, eliminating swirling phenomena that affect particle movement. This effectively improves the uniformity of the tobacco airflow, ensuring even particle movement trajectories and good consistency, thus guaranteeing uniform moisture content of the dried tobacco and improving tobacco quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the screening device part of the gas-material separator of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the wire drying tower of this utility model.

[0019] Figure 4 This is a simulation trajectory diagram of the movement of tobacco particles inside the drying tower of this invention, simulated using ANSYS simulation software.

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

[0021] In the diagram, 1 is the burner; 2 is the drying tower; 3 is the gas-material separator; 4 is the tobacco feed inlet; 5 is the first air inlet; 6 is the tobacco outlet; 7 is the shell; 8 is the screening device; 9 is the screening pipe; 10 is the vibrator; 11 is the first flexible connector; 12 is the first air outlet pipe; 13 is the second air outlet pipe; 14 is the second flexible connector; 15 is the feed equalizer; 16 is the vibrating groove; 17 is the expansion device; 18 is the first air pipe; 19 is the ejector air pipe; 20 is the tower body; 21 is the top wall section; 22 is the straight section; and 23 is the expansion section. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Please refer to Figures 1 to 5 This embodiment provides a tower-type airflow tobacco drying machine system, including a burner 1, a drying tower 2, and a gas-material separator 3. The drying tower 2 is provided with a tobacco inlet 4, a first air inlet 5, and a tobacco outlet 6. The gas-material separator 3 includes a shell 7, which is provided with an inlet, an air outlet, and a tobacco discharge outlet. The inlet of the gas-material separator 3 is connected to the tobacco outlet 6 of the drying tower 2. A screening device 8 is provided at the air outlet of the gas-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 air outlet extends into the inner cavity of the housing 7 and connects to the screening pipe 9. The other end of the air outlet extends out of the housing 7. The outer diameter of the air outlet is smaller than the diameter of the air outlet. A first flexible connector 11 is used to achieve a flexible connection between the air outlet and the housing 7, and also to seal the gap between the air outlet and the air outlet of the housing 7. The section of the air outlet extending out of the housing 7 is called the protruding section. A vibrator 10 is connected to the outside of the protruding section of the air outlet. The vibrator 10 drives the air outlet to vibrate, thereby driving the screening pipe 9 to vibrate. The air outlet includes a first air outlet 12 and a second air outlet 13. The first end of the first air outlet 12 is connected to the screening pipe 9. The end of the first air outlet 12 and the first end of the second air outlet 13 are flexibly connected through a second flexible connector 14. The vibrator 10 is mounted on the first air outlet 12.

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

[0025] In use, after the tobacco shreds are loosened by the equalizer 15, they enter the vibrating trough 16 for further loosening, and then enter the expansion device 17. In the expansion device 17, some of the process gas mixed with steam is mixed with the tobacco shreds. The tobacco shreds fully absorb moisture and expand in the expansion device 17 and are pushed to the tobacco shred inlet 4 under the action of the hot gas jet output from the burner 1. At the same time, the upward-sloping ejector gas is delivered to the tobacco shred inlet 4 of the drying tower 2 through the end of the ejector gas pipe 19, which can effectively prevent the tobacco shred inlet 4 from being blocked. Burner 1 provides high-temperature gas, a portion of which enters the drying tower 2 through the first air inlet 5 at the bottom. The tobacco feed inlet 4 on the side wall of the drying tower 2 continuously feeds in pre-dried tobacco. As the hot air flows from bottom to top, it encounters and mixes with the tobacco entering the tower 20, causing the tobacco to flow upwards and achieving upward gaseous transport. Simultaneously, the high-temperature air carries away moisture from the tobacco, achieving rapid drying. Finally, the dried tobacco exits the drying tower... The tobacco leaves exit through the tobacco discharge port 6 on one side of the top of the tobacco tower 2. The tobacco leaves and hot air flow together enter the gas-material separator 3 for gas-material separation. The separated tobacco leaves through the tobacco drop port and enters the next process. The separated gas leaves the gas-material separator 3 through the gas outlet and enters the burner 1 for heating. The heated hot air can be circulated for drying tobacco leaves, which is equivalent to recovering the waste heat in the gas, so as to improve energy utilization and reduce the unit loss during tobacco drying.

[0026] Inside the gas-material separator 3, when the airflow leaves the separator through the outlet, fine tobacco particles and dust broken during the drying process enter the outlet duct along with the gas flow. Moist particles and dust easily accumulate inside or at the outlet duct, causing blockage and disrupting the stability of the process air circulation system, thus affecting the uniformity of the moisture content of the dried tobacco. To address this, a screening pipe 9 is installed at one end of the outlet duct that extends into the housing 7, filtering particles and dust onto the outside of the screening pipe 9, preventing blockage. Simultaneously, to prevent particles and dust from clogging the filter holes of the screening pipe 9, the high-frequency oscillation characteristic of the vibrator 10 is utilized, ensuring the screening pipe 9 is constantly vibrating. This prevents the filter holes of the screening pipe 9 from being blocked by fine particles and dust in the tobacco-air mixture, thereby improving the stability of the process air control system and reducing the uneven distribution of moisture content in the dried tobacco.

[0027] Since the vibrator 10 acts directly on the air outlet pipe, and the air outlet pipe passes through the air outlet, to avoid stress or collision between the vibrating air outlet pipe and the wall of the air outlet hole, the outer diameter of the air outlet pipe needs to be designed to be smaller than the diameter of the air outlet hole. However, such a structure will result in a large gap between the air outlet pipe and the air outlet. Therefore, by setting the first flexible connector 11, a flexible seal can be achieved, preventing the airflow in the air-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 during vibration, to prevent the oscillation 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 these two parts are connected by the second flexible connector 14. In this way, the second flexible connector 14 can not only achieve a seal between the first air outlet pipe 12 and the second air outlet pipe 13, but also significantly reduce the oscillation 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] The first flexible connector 11 and the second flexible connector 14 can both be made of canvas, silicone, or silicone rubber. Canvas has good waterproof performance and is also sturdy and durable, which helps to reduce the cost of use. Silicone and silicone rubber are more environmentally friendly and help to ensure the safety of tobacco.

[0029] The drying tower 2 includes a tower body 20 and a tower cap located at the top of the tower body 20. A first air inlet 5 is located at the bottom of the tower body 20, a tobacco feed inlet 4 is located on one side of the tower body 20 near the bottom, and a tobacco discharge outlet 6 is located on one side of the tower cap near the top. The tower cap includes a top wall section 21 and side wall sections arranged vertically. The top wall section 21 is a right-angled tube structure formed by a vertical section and a horizontal section, with a rounded transition between the vertical and horizontal sections. The horizontal section of the top wall section 21 gradually narrows from the end closest to the vertical section. The tobacco discharge outlet 6 is located at the narrowed end of the horizontal section of the top wall section 21. The side wall sections of the tower cap include a straight section 22 and an expanding section 23 connected vertically. The expanding section 23 is an expanding section that gradually widens from bottom to top. The bottom end of the expanding section 23 connects to the top of the tower body 20, and the top end of the straight section 22 connects to the bottom end of the side wall sections of the tower cap.

[0030] In the traditional tobacco drying tower 2 structure, the top of the tower 2 has a right-angled sidewall, resulting in an uneven flow field in the top region of the tower 2. This affects the residence time of the tobacco shreds, ultimately leading to significant differences in the uniformity of tobacco drying. Specifically, because the axis of the tobacco inlet 4 is perpendicular to the axis of the first air inlet 5, the tobacco shreds, as they rise to the top of the tower, experience changes in their trajectory due to collisions with the top of the tower 20 and the uneven flow field. This causes significant differences in the residence time of the tobacco shreds in the drying tower 2, resulting in differences in the degree of drying and causing uneven distribution of the moisture content of the tobacco shreds.

[0031] Compared to the traditional drying tower 2 structure, this embodiment designs the top wall section 21 of the tower cap as a right-angled tube structure with a rounded transition. The rounded top wall structure allows the airflow to pass more smoothly through the top corner area of ​​the drying tower 2, avoiding the problem of excessive drying of the tobacco caused by the airflow swirling at the top of the tower, thus promoting more uniform drying of the tobacco. At the same time, the side wall section of the tower cap includes a gradually widening expansion section 23, which is equivalent to increasing the inner diameter of the tower cap. This provides more diffusion space for the tobacco airflow, reducing the probability of contact or collision between the tobacco airflow and the side wall of the tower cap. It avoids the phenomenon of changes in the movement trajectory of the tobacco after collision with the side wall, thus promoting a more consistent movement trajectory of the tobacco, ensuring a more consistent drying residence time, and thus ensuring a more consistent degree of drying, ultimately improving the uniformity of the moisture content distribution of the tobacco.

[0032] The applicant used ANSYS simulation software to simulate the trajectory of tobacco particles in the drying tower 2 of this utility model and the traditional drying tower 2, and obtained simulated tobacco particle trajectory diagrams. Figure 4 This is a simulation trajectory diagram of the movement of tobacco particles in the drying tower 2 of this invention, simulated using 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 using ANSYS simulation software.

[0033] After comparison Figure 4 and Figure 5 As can be seen from the particle trajectory of the tobacco shreds, in the traditional structure of the drying tower 2, collisions occur near the top of the drying tower 2, affecting most of the particle movement trajectory, and a small portion of the particle movement trajectory exhibits swirling phenomena. However, the drying tower 2 provided in this embodiment of the present invention has been redesigned with a smooth transition at the top wall section 21 of the tower cap, gradually narrowing towards the tobacco discharge port 6. This results in fewer collisions between the particles moving within the drying tower 2 and the sides and top of the tower body 20, eliminating swirling phenomena that affect particle movement. This effectively improves the uniformity of the tobacco airflow, ensuring that the particle movement trajectory is evenly dispersed and exhibits good consistency. This helps ensure the uniformity of the moisture content of the dried tobacco, improves the quality of the tobacco, and enhances the precision processing level of the tower-type airflow drying machine.

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

Claims

1. A tower type gas flow cut tobacco machine system, comprising a burner (1), a cut tobacco tower (2), a gas material separator (3), the cut tobacco tower (2) being provided with a cut tobacco feeding port (4), a first gas inlet port (5) and a cut tobacco discharging port (6), the gas material separator (3) comprising a housing (7), the housing (7) being provided with a feeding port, a gas outlet port and a cut tobacco discharging port, the feeding port of the gas material separator (3) being in communication with the cut tobacco discharging port (6) of the cut tobacco tower (2), characterized in that: The gas outlet of the gas-material separator (3) is provided with a screening device (8), which includes a screening pipe (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 gas outlet and is connected with the screening pipe (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 hole diameter of the gas outlet. The flexible connection between the air outlet pipe and the shell (7) is realized through a first flexible connecting member (11), and the gap between the air outlet pipe and the gas outlet of the shell (7) is sealed through the first flexible connecting member (11). The pipe section of the air outlet pipe extending out of the shell (7) is an extending section. The outside of the extending section of the air outlet pipe is connected with the vibrator (10). The vibrator (10) drives the air outlet pipe to vibrate, thereby driving the screening pipe (9) to vibrate.

2. A tower-type rod drying machine system according to claim 1, characterized in that: The cut tobacco drying tower (2) comprises a tower body (20) and a tower cap arranged at the upper end of the tower body (20). The cut tobacco feeding port (4) is arranged on the tower body (20), and the cut tobacco discharging port (6) is arranged on the tower cap. The tower cap comprises a top wall section (21) and a side wall section arranged in a vertical and horizontal manner. The top wall section (21) is a right-angle pipe 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 connected through a circular arc. The horizontal section of the top wall section (21) is gradually tapered from one end close to the vertical section. The cut tobacco discharging port (6) is arranged at the tapered end of the horizontal section of the top wall section (21).

3. A tower-type rod drying machine system as claimed in claim 2, characterized in that: The side wall section of the tower cap comprises a flat section (22) and an expanding section (23) connected in a vertical and horizontal manner. The expanding section (23) is an expanding section which is gradually expanded from bottom to top. The bottom end of the expanding section (23) is connected with the top end of the tower body (20). The top end of the flat section (22) is connected with the bottom end of the side wall section of the tower cap.

4. A tower-type rod drying machine 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 first end of the first air outlet pipe (12) is connected with the screening pipe (9). The flexible connection between the end of the first air outlet pipe (12) and the first end of the second air outlet pipe (13) is realized through a second flexible connecting member (14). The vibrator (10) is arranged on the first air outlet pipe (12).

5. A tower-type rod drying gas stream machine system as claimed in claim 1, characterized in that: The device further comprises a material mixer (15) and a vibrating tank (16). The inlet end of the vibrating tank (16) is communicated with the discharging port of the material mixer (15). The outlet end of the vibrating tank (16) is communicated with the cut tobacco feeding port (4) of the cut tobacco drying tower (2).

6. A tower-type rod drying gas stream machine system as claimed in claim 5, characterized in that: The device further comprises an expanding device (17). The outlet end of the expanding device (17) is communicated with the cut tobacco feeding port (4) of the cut tobacco drying tower (2). The inlet end of the expanding device (17) is communicated with the discharging port of the vibrating tank (16).

7. A tower-type rod drying gas stream machine system as claimed in claim 6, characterized in that: The device further comprises a burner (1). The burner (1) is provided with a second gas inlet and an exhaust port. The gas outlet of the gas-material separator (3) is communicated with the second gas inlet of the burner (1). The exhaust port of the burner (1) is communicated with the first gas inlet (5) of the cut tobacco drying tower (2).

8. A tower-type rod drying gas stream machine system as claimed in claim 7, characterized in that: The exhaust port of the burner (1) is further communicated with the expanding device (17). The outlet end of the vibrating tank (16) is arranged on a gas pipe between the exhaust port and the expanding device (17).

9. A tower-type rod drying gas stream machine system as claimed in claim 8, characterized in that: The exhaust port of the burner (1) is connected with the expansion device (17) through a first air pipe (18), and a bypass ejection air pipe (19) is arranged on the first air pipe (18), the ejection air pipe (19) is connected with the expansion device (17) in parallel, and the tail end of the ejection air pipe (19) extends obliquely upward and is connected with the tobacco feed port (4) of the cut tobacco drying tower (2).

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