Tobacco fragment separating and recycling device and hot air leaf moistening machine with same
By installing a gravity-airflow synergistic tobacco fragment separation and recycling device upstream of the circulating air duct of the hot air leaf humidifier, and using spiral guide vanes to achieve efficient separation and recycling of large particles, the problem of low separation efficiency and resource waste of cyclone dust collectors is solved, thereby improving equipment operating efficiency and environmental performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-27
AI Technical Summary
Existing cyclone dust collectors have low separation efficiency when handling larger particles, leading to the accumulation of impurities, which affects the stable operation of the equipment and the cleanliness of the system. At the same time, they fail to effectively recover broken tobacco flakes and hemp fibers, increasing production costs and potentially causing environmental pollution.
A tobacco fragment separation and recovery device based on gravity-airflow synergy is adopted. A spiral guide vane is used to form a spiral flow channel in the channel. Large particles are separated and recovered through the synergistic effect of gravity and airflow. It is set upstream of the circulating air duct of the hot air leaf humidifier to reduce the burden on the cyclone dust collector.
It improves equipment operating efficiency, reduces the workload of cyclone dust collectors, achieves efficient separation and stable material discharge, reduces resource waste, and meets energy conservation and emission reduction requirements.
Smart Images
Figure CN224038452U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a tobacco processing equipment, more specifically to a tobacco fragment separation and recovery device based on gravity-airflow synergistic effect and a hot air leaf conditioning machine provided with the device. BACKGROUND
[0002] The hot air leaf conditioning machine is a core equipment in the leaf conditioning and redrying process of the tobacco processing industry, which is used for heating and humidifying the tobacco leaves to make the tobacco leaves have certain toughness and anti-breaking property to meet the needs of subsequent leaf and stem separation and redrying process. In production, the hot air leaf conditioning machine adopts a circulating hot air mode, and the airflow containing tobacco fragments, tow and dust is sent into a cyclone dust collector through a return air pipeline for separation. The cyclone dust collector can improve the cleanliness of the system while effectively protecting the heater fins and reducing the energy consumption of the equipment. However, there are still many defects, including:
[0003] The existing cyclone dust collector has limited separation efficiency when dealing with larger particles (such as tobacco fragments, tow and dust). Larger particles tend to accumulate in the cyclone dust collector, resulting in a decrease in dust removal efficiency and the inability to completely separate impurities. This not only affects the long-term stable operation of the equipment, but also may cause impurities to deposit in the air duct, hindering the flow of airflow, ultimately affecting the cleanliness of the system and the overall efficiency of the equipment.
[0004] Secondly, after the tobacco fragments and tow are separated by the cyclone dust collector, they are usually directly discharged through the ash discharge port without effective recovery and utilization. This not only wastes recyclable resources and increases production costs, but also may cause environmental pollution, especially when these impurities are not properly treated, which may have a negative impact on the environment. Therefore, how to effectively recover and utilize these impurities has become a key to technical improvement. SUMMARY
[0005] The utility model provides a tobacco fragment separation and recovery device based on gravity-airflow synergistic effect, and a hot air leaf conditioning machine provided with the tobacco fragment separation and recovery device, so as to more accurately separate and recover tobacco fragments and tow before the airflow enters the cyclone dust collector, significantly reduce the burden of the cyclone dust collector, and further improve the overall operation efficiency and environmental protection performance of the equipment, providing an efficient and environmentally friendly solution to the above technical problems.
[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0007] A tobacco fragment separation and recovery device, which has the following structural characteristics:
[0008] A vertical through inner cavity is formed in the device; the inner cavity is divided into three coaxial chambers, including an air inlet chamber at the bottom end and a separation chamber connected to the air inlet chamber, and a collection chamber surrounding the air inlet chamber and connected to the separation chamber; the inner diameter of the air inlet chamber is smaller than that of the separation chamber, and both are cylindrical chambers, which together form a channel for negative pressure airflow; a channel inlet is formed at the end of the air inlet chamber, a channel outlet is formed at the end of the separation chamber, and a spiral-shaped guide vane is coaxially arranged between the channel inlet and the outlet; a spiral-shaped drainage channel is formed in the channel by the guide vane, which separates the impurities carried by the negative pressure airflow; a radial gap is left between the outer edge of the guide vane and the inner wall of the separation chamber, and the separated impurities fall into the collection chamber through the gap and are collected; an inclined guide plate is arranged between the discharge port and the lower edge of the separation chamber on the opposite side in the collection chamber; the surface of the guide plate is flat and is arranged between the outer wall of the air inlet chamber and the inner wall of the collection chamber.
[0009] The structural features of the device are also characterized in that:
[0010] The negative pressure airflow comes from the hot air leaf moistening machine, and the impurities carried by the circulating air after heat exchange with the material in the circulating air duct of the hot air leaf moistening machine include tobacco shreds, hemp filaments and dust.
[0011] A partition is arranged at the top end of the collection chamber; the outer top end of the partition is flush with the top of the collection chamber, and a radial gap with uniform width is left between the partition and the inner wall of the collection chamber as a material receiving port; the collection chamber and the separation chamber are connected only through the material receiving port, and are isolated by the partition except at the material receiving port.
[0012] A radial gap is left between the guide vane and the inner wall of the air inlet chamber.
[0013] The end of the air inlet chamber is open as the channel inlet, and the end of the separation chamber is centrally open as the channel outlet.
[0014] The discharge port is switchable.
[0015] The utility model also provides a hot air leaf moistening machine, which is a drum-type hot air leaf moistening machine, and the tobacco shred separation and recovery device is arranged on the circulating air duct.
[0016] Further, the hot air leaf moistening machine is provided with a discharge cover corresponding to the circulating air duct on the air outlet side of the outer cover, which is used for collecting the circulating air after heat exchange with the material in the leaf moistening drum; the air outlet of the discharge cover is connected to the channel inlet of the tobacco shred separation and recovery device, and the channel outlet of the tobacco shred separation and recovery device is connected to the air inlet of the cyclone dust collector through a return air duct.
[0017] Compared with the prior art, the beneficial effects of the utility model lie in:
[0018] The utility model is suitable for separating and recycling tobacco fragments in the tobacco processing process, especially for the matching process of the hot air leaf moistening machine and the cyclone dust collector, utilizing the spiral-shaped guide flow channel formed by the guide vane in the channel, through the synergistic effect of gravity and airflow, the large-particle tobacco fragments and hemp filaments carried by the circulating airflow are efficiently separated and stably discharged, the equipment operation efficiency is improved, resource waste is reduced, the working load of the cyclone dust collector is reduced, so that the cyclone dust collector no longer undertakes the separation task of a large amount of tobacco fragments, and the separation efficiency of the cyclone dust collector on particulate matters is improved. The utility model is a high-efficiency, energy-saving and environment-friendly tobacco fragment separation and recycling solution, can adapt to different airflow flow and particle concentration changes, and can meet the requirements of the industry on energy saving, emission reduction and environmental protection performance. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is the structure schematic view of the tobacco fragment separation and recycling device of the utility model;
[0020] Figure 2 It is the overhead schematic view of the internal structure of the tobacco fragment separation and recycling device of the utility model;
[0021] Figure 3 It is the bottom view schematic view of the internal structure of the tobacco fragment separation and recycling device of the utility model;
[0022] Figure 4 It is Figure 3 The A-A cross section structure schematic view of
[0023] Figure 5 It is the structure schematic view of the hot air leaf moistening machine of the utility model.
[0024] In the drawing, 1 is a tobacco fragment separation and recycling device; 11 is an air inlet cavity; 12 is a separation cavity; 13 is a collection cavity; 14 is an air inlet; 15 is an air outlet; 16 is a guide vane; 17 is a guide plate; 18 is a discharge port; 19 is a partition plate; 2 is a hot air leaf moistening machine; 21 is a circulating air duct; 22 is a cyclone dust collector; and 23 is a discharge cover. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model will be clearly and completely described below, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0026] Please refer toFigures 1 to 4 The tobacco chip separating and recycling device of the embodiment forms a vertical through inner cavity; the inner cavity is divided into three coaxial chambers, including the air inlet chamber 11 at the bottom end and the separating chamber 12 connected to the air inlet chamber 11, and the collecting chamber 13 surrounding the air inlet chamber 11 and connected to the separating chamber 12; the inner diameter of the air inlet chamber 11 is smaller than that of the separating chamber 12, and both are cylindrical chambers, which together form a channel for the negative pressure airflow to pass through; the air inlet chamber 11 has a channel air inlet 14 at the end, the separating chamber 12 has a channel air outlet 15 at the end, the channel is coaxially provided with a spiral-shaped guide vane 16 between the air inlet 14 and the air outlet 15, the channel forms a spiral-shaped drainage flow channel through the guide vane 16, and the channel with the drainage flow channel separates the impurities carried by the passing negative pressure airflow; a radial gap is left between the outer edge of the guide vane 16 and the inner wall of the separating chamber 12, and the separated impurities fall into the collecting chamber 13 through the gap and are collected, and are discharged through the discharge port 18 at the bottom end of the side wall of the collecting chamber 13; in the collecting chamber 13, an inclined guide plate 17 is arranged between the discharge port 18 and the lower edge of the opposite separating chamber 12, the upper surface of the guide plate 17 is flat, and is arranged between the outer wall of the air inlet chamber 11 and the inner wall of the collecting chamber 13.
[0027] In specific implementation, the corresponding structure of the device also includes:
[0028] The parameters of the guide vane 16 should meet the following conditions:
[0029] The helix angle α should be able to make the centrifugal force of the carried impurities in the airflow greater than 3 times its weight, so as to ensure that the impurities can be efficiently separated;
[0030] The ratio of the curvature radius R to the diameter d of the impurity particles is R / d = 50-200; p p
[0031] The radial gap width δ between the outer edge of the guide vane 16 and the inner wall of the separating chamber 12 increases with the increase of the airflow Q;
[0032] The axial spacing s of the guide vane 16 increases gradually with each rotation, and the ratio of the maximum value to the minimum value is not more than 3:1, and the decreasing gradient is proportional to the reciprocal of the inner diameter D of the separating chamber 12, so as to optimize the rotation effect of the airflow and improve the separation efficiency of the impurities carried by the airflow.
[0033] On the basis of the embodiment, the inclination angle of the guide plate 17 can be designed to be adjustable to facilitate smoother discharging. The inclination angle of the guide plate can be adjusted by using a hydraulic or pneumatic system. When adjusting the inclination angle of the guide plate 17, the impurities in the collection cavity 13 can smoothly slide along the guide plate 17, and accumulation at the discharge port 18 is avoided to cause poor discharging.
[0034] The guide vane 16 and the inner circumferential wall of the air inlet cavity 11 are radially spaced apart.
[0035] The negative pressure airflow comes from the hot air leaf moistening machine 2, and is the circulating air in the circulating air duct 21 of the hot air leaf moistening machine 2 after heat exchange with the material. The impurities carried by the circulating air include tobacco shreds, hemp filaments, and dust.
[0036] A ring-shaped partition plate 19 is arranged at the top end of the collection cavity 13. The outer edge of the top end of the partition plate 19 is flush with the top of the collection cavity 13, and the inner edge is connected to the upper end of the outer circumferential wall of the air inlet cavity 11. A uniform radial gap is left between the inner circumferential wall of the collection cavity 13 and the outer circumferential wall of the air inlet cavity 11 according to the width of the bottom end of the gap area, which serves as a ring-shaped material receiving port. The collection cavity 13 and the separation cavity 12 are only connected through the material receiving port, and are isolated by the partition plate 19 except at the material receiving port.
[0037] The ratio of the diameter of the outer edge of the partition plate 19 to the inner diameter of the air inlet cavity 11 is 1.2-1.5. The partition plate 19 is an arc-shaped plate arranged around the outer periphery of the air inlet cavity 11 with a concave surface facing upwards. The ratio of the curvature radius of the arc to the inner diameter of the separation cavity 12 is 0.3-0.6.
[0038] The end of the air inlet cavity 11 is open, serving as the air inlet 14. The end of the separation cavity 12 is centrally open, serving as the air outlet 15.
[0039] The discharge port 18 can be opened and closed.
[0040] The device is a thin-walled shell structure. The part where the separation cavity 12 is located is a large cylinder, the parts where the collection cavity 13 and the air inlet cavity 11 are located are conical hoppers, the large end of the conical hopper faces upwards and is connected to the large cylinder with the same diameter, and the air inlet cavity 11 is a small cylinder centrally arranged in the conical hopper.
[0041] Referring to Figure 5 The embodiment also proposes a hot air leaf moistening machine 2, which is a drum-type hot air leaf moistening machine 2. The tobacco shred separation and recovery device 1 described above is arranged on the circulating air duct 21. The device is arranged in the return air section of the circulating air duct 21 and is located upstream of the cyclone dust collector 22.
[0042] Further, the hot air leaf moistening machine 2 is provided with an outlet cover 23 on the outlet side cover corresponding to the circulating air duct 21, which is used to collect the circulating air after heat exchange with the material in the leaf moistening cylinder, and the air outlet of the outlet cover 23 is connected with the channel air inlet 14 of the tobacco chip separation and recovery device 1, and the channel air outlet 15 of the tobacco chip separation and recovery device 1 is connected with the air inlet of the cyclone dust collector 22 through the air return pipe.
[0043] The tobacco chip separation and recovery device 1 is arranged based on the cooperation of gravity and air flow, which is suitable for the separation and recovery of tobacco chips in the tobacco processing process, and can be applied to the circulating air duct 21 of the hot air leaf moistening machine 2, so that the circulating air after heat exchange with the material enters the outlet cover 23, and then passes through the tobacco chip separation and recovery device 1 before entering the cyclone dust collector 22, the negative pressure air flow containing tobacco chips, hemp filaments and dust enters the air inlet cavity 11, the spiral-shaped flow guide channel formed by the guide vane 16 forms a closed loop flow channel, which increases the rotation angle and lift angle of the air flow, promotes the air flow to change from axial motion to tangential rotation motion, improves the rotation speed and stability of the air flow, and improves the interaction between the air flow and the tobacco chips, hemp filaments and dust carried by the air flow, after entering the separation cavity 12, the rotation effect is further strengthened, the rotation speed is continuously increased, a stable low-pressure vortex core is formed, more efficient particle centrifugal separation is realized, and finally the air flow is discharged through the air outlet 15 and enters the cyclone dust collector 22 through the air return pipe.
[0044] The larger particles (diameter > 10mm) of tobacco chips or hemp filaments adhere to the inner wall of the channel due to the centrifugal force, and fall into the collection cavity 13 along the gap area. The setting of the partition plate 19 can effectively block the direct impact of the air flow on the collection cavity 13, avoid the secondary mixing of the separated tobacco chips in the air flow, and also form an outer ring flow along the outer wall of the air inlet cavity 11 by guiding the air flow, reduce the turbulence interference, ensure the stability of the air flow, and further ensure the separation efficiency.
[0045] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A tobacco chip separation and recovery device, characterized in that: a vertical through cavity is formed in the device; the cavity is divided into three coaxial chambers, including an air inlet chamber at the bottom end and a separation chamber connected to the air inlet chamber, and a collection chamber connected to the separation chamber; the inner diameter of the air inlet chamber is smaller than that of the separation chamber, and both are cylindrical chambers, which together form a channel for negative pressure airflow; a spiral guide vane is coaxially arranged between the air inlet and the air outlet; the channel forms a spiral flow channel through the guide vane, which separates the impurities carried by the negative pressure airflow; a radial gap is left between the outer edge of the guide vane and the inner wall of the separation chamber, and the separated impurities fall into the collection chamber and are collected; an inclined guide plate is arranged between the discharge port and the opposite side of the separation chamber; the guide plate is flat and is arranged between the outer wall of the air inlet chamber and the inner wall of the collection chamber. The negative pressure airflow comes from the hot air leaf moistening machine, and the impurities carried by the circulating air after heat exchange with the material include tobacco chips, hemp and dust.
2. The tobacco shred separation and recovery apparatus according to claim 1, characterized by: A partition is arranged at the top end of the collection chamber; the outer top end of the partition is flush with the top of the collection chamber, and a radial gap with uniform width is left between the partition and the inner wall of the collection chamber as a material receiving port; the collection chamber and the separation chamber are connected only through the material receiving port, and are isolated by the partition except at the material receiving port.
3. The tobacco shred separation and recovery apparatus according to claim 1, characterized by: A radial gap is left between the guide vane and the inner wall of the air inlet chamber.
4. The tobacco shred separation and recovery apparatus according to claim 1, characterized by: The end of the air inlet chamber is open as the air inlet of the channel, and the end of the separation chamber is centrally open as the air outlet of the channel.
5. The tobacco shred separation and recovery apparatus according to claim 1, characterized by: The discharge port can be opened and closed.
6. The tobacco shred separation and recovery apparatus according to claim 1, characterized by: A drum-type hot air leaf moistening machine is provided with the tobacco chip separation and recovery device according to any one of claims 1-6 on the circulating air duct; the device is arranged in the return air section of the circulating air duct and is located upstream of the cyclone dust collector.
7. A hot air leaf moistening machine characterized by: A discharge cover is arranged on the outer cover of the circulating air duct on the air outlet side to collect the circulating air after heat exchange with the material in the leaf moistening drum; the air outlet of the discharge cover is connected to the air inlet of the channel of the tobacco chip separation and recovery device, and the air outlet of the channel of the tobacco chip separation and recovery device is connected to the air inlet of the cyclone dust collector through a return air pipe.
8. The leaf moistening machine according to claim 7, characterized in that: