Air separation device for stem slivers

Abstract

The utility model belongs to the technical field of tobacco stem removal, and particularly relates to a stem air separation device. The sliver air separation device comprises an air separation chamber used for separating slivers and tobacco shreds, the side wall of the air separation chamber is provided with a feeding port allowing mixed materials of the slivers and the tobacco shreds to enter the air separation chamber, and the upper end of the air separation chamber is provided with a tobacco shred discharging port allowing the tobacco shreds to be discharged out of the air separation chamber. The lower end of the air separation chamber is provided with a stem discharge port for discharging stems out of the air separation chamber, an inner cavity of the air separation chamber comprises at least one gradual change cavity with the section gradually becoming smaller from top to bottom and / or at least one gradual change cavity with the section gradually becoming larger from top to bottom, and the feeding port is located above the gradual change cavities or formed in the cavity wall of the uppermost gradual change cavity. The air speed in the air separation chamber can be changed under the action of the gradual change cavity, so that stem-containing tobacco shreds entering the air separation chamber are violently mixed and dispersed more uniformly, and the stem sliver removal ratio is further improved. Meanwhile, loss caused by tobacco shred breakage can be reduced without arranging a stop dog.

Description

Technical Field

[0001] The utility model relates to a stem sliver pneumatic separation device, belonging to the field of tobacco stem removal. Background Art

[0002] The purity of cut tobacco is one of the key factors affecting the quality of medium and fine cigarette. How to continuously reduce the proportion of stem slivers in cigarettes to maximize the purity of cut tobacco is the direction that the industry has been working hard on. The stem sliver separation system of a cigarette making machine is one of the important methods to improve the purity of cut tobacco. Its main function is to throw the agglomerated cut tobacco with stems into the stem sliver pneumatic separation device through a high-speed feeding belt during the cigarette rolling production process. Using the principle of gravity separation, a motor providing negative pressure is set at the top of the stem sliver pneumatic separation device, and an air volume regulating device is set to adjust the indoor wind speed, so that the stem shreds are dispersed under the action of the upward air flow. At the same time, the lighter cut tobacco rises, and the heavier tobacco stems or cut tobacco sink, thus realizing the separation of stem slivers and cut tobacco.

[0003] In the existing stem sliver pneumatic separation device, such as a stem shred separation chamber (i.e., the stem sliver pneumatic separation device) disclosed in a Chinese utility model patent with the authorization publication number CN202169249U and the authorization publication date of March 21, 2012. The separation chamber includes a cut tobacco output port at the top, a stem shred input port on the rear plate, a stem shred output port at the lower part of the separation chamber, a plurality of stoppers fixed on the inner walls of the opposite sides of the separation chamber, a lower regulating air door and a lower air inlet at the bottom of the separation chamber, and a plurality of rows of uniformly distributed air outlet holes and an upper regulating air door on the upper cover of the separation chamber. When in use, the agglomerated cut tobacco with stems enters the separation chamber from the stem shred input port on the rear plate, and the wind speed in the separation chamber is adjusted by the upper regulating air door and the lower regulating air door, so that the cut tobacco with stems in the separation chamber tumbles and disperses under the action of the upward air flow. The lighter cut tobacco rises with the air flow to the cut tobacco output port, and the heavier stem slivers or cut tobacco fall downward. The cut tobacco with stems falling on both sides collides with the stoppers and tumbles, so as to be further dispersed, and the cut tobacco mixed in it rises with the air flow and is discharged from the cut tobacco output port. The heavier stem slivers continue to sink and fall into the stem storage box, realizing the separation of stem slivers and cut tobacco.

[0004] However, after the stem shreds enter the pneumatic separation chamber, the cut tobacco with stems sinking from the middle of the pneumatic separation chamber will not collide with the stoppers on the side plates, and can only rely on the upward air flow to disperse the cut tobacco with stems to separate the cut tobacco and the stem slivers. The wind speed in the pneumatic separation chamber is the same up and down, and the cut tobacco with stems cannot tumble violently, so that the cut tobacco and the stem slivers cannot be fully and evenly dispersed. Some cut tobacco will be discharged from the stem sliver output port along with the stem slivers, resulting in poor dispersion effect and low stem sliver rejection ratio. At the same time, when the cut tobacco collides with the stoppers, the cut tobacco is very easy to be broken, thus increasing the loss of cut tobacco and the production cost. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a stem and cigarette cuttings air separation device, so as to solve the problems that in the existing air separation chamber, the separation of cigarette cuttings and stem and cuttings is achieved by setting stoppers on the inner wall, resulting in a low rejection ratio of stem and cuttings and an increase in cigarette cuttings loss.

[0006] To achieve the above purpose, the following technical solution is adopted for the stem and cigarette cuttings air separation device in the present utility model:

[0007] The stem and cigarette cuttings air separation device includes an air separation chamber for separating stem and cuttings from cigarette cuttings. An inlet is provided on the side wall of the air separation chamber for the mixed material of stem and cuttings and cigarette cuttings to enter the air separation chamber. A cigarette cuttings discharge port for discharging cigarette cuttings from the air separation chamber is provided at the upper end of the air separation chamber, and a stem and cuttings discharge port for discharging stem and cuttings from the air separation chamber is provided at the lower end of the air separation chamber. The inner cavity of the air separation chamber includes at least one gradually decreasing cavity whose cross-section gradually becomes smaller from top to bottom and / or at least one gradually increasing cavity whose cross-section gradually becomes larger from top to bottom. The inlet is located above each gradually changing cavity or the inlet is provided on the cavity wall of the uppermost gradually changing cavity.

[0008] The beneficial effects of the above technical solution are as follows: The present utility model belongs to a pioneering invention. The stem and cigarette cuttings air separation device includes an air separation chamber for separating stem and cuttings from cigarette cuttings. Utilizing the principle of gravity, the lighter cigarette cuttings rise with the airflow, and the heavier stem and cuttings fall under the action of gravity. A cigarette cuttings discharge port is provided at the upper end of the air separation chamber, and a stem and cuttings discharge port is provided at the lower end, which is conducive to the discharge of stem and cuttings and cigarette cuttings. The inlet is provided above each gradually changing cavity or on the cavity wall of the uppermost gradually changing cavity to ensure that the cut tobacco containing stem and cuttings can pass through all the gradually changing cavities. When the air separation chamber only includes a gradually decreasing cavity whose cross-section gradually becomes smaller from top to bottom, according to the Venturi effect, the airflow velocity at the uppermost part of the gradually changing cavity is the smallest, and the airflow velocity at the lowermost part is the largest. The cut tobacco containing stem and cuttings group entering the gradually changing cavity will be dispersed by the fast airflow at the lower end of the gradually changing cavity and spread out at the upper end of the gradually changing cavity, so that the lighter cigarette cuttings rise with the airflow, and the undispersed cut tobacco containing stem and cuttings group or the heavier stem and cuttings sink until they are discharged.

[0009] When the air separation chamber only includes a gradually increasing cavity whose cross-section gradually becomes larger from top to bottom, the airflow velocity at the uppermost part of the gradually changing cavity is the largest, and the airflow velocity at the lowermost part is the smallest. The cut tobacco containing stem and cuttings entering the air separation chamber is dispersed by the fast airflow and spreads out at the larger cross-section area at the lower part. The lighter cigarette cuttings rise with the airflow, and the heavier stem and cuttings or the cut tobacco containing stem and cuttings group sink and are discharged.

[0010] When the air separation chamber includes a gradually decreasing cavity whose cross-section gradually becomes smaller from top to bottom and a gradually increasing cavity whose cross-section gradually becomes larger from top to bottom, the air separation chamber can combine the advantages of both gradually changing cavities, enabling the cut tobacco containing stem and cuttings entering the air separation chamber to rise and spread, descend and spread, and tumble violently under the action of variable airflow velocities, so that the stem and cuttings and cigarette cuttings are more evenly dispersed, improving the rejection ratio of stem and cuttings. In addition, there is no need to set stoppers on the inner wall of the air separation chamber, effectively reducing the loss caused by cut tobacco breakage.

[0011] Furthermore, the inner cavity of the air separation chamber includes at least one gradually decreasing cavity whose cross-section gradually decreases from top to bottom and at least one gradually increasing cavity whose cross-section gradually increases from top to bottom. The gradually decreasing cavity from top to bottom is the first gradually changing cavity, and the gradually increasing cavity from top to bottom is the second gradually changing cavity. The first gradually changing cavity and the second gradually changing cavity are arranged vertically and the cavity walls are directly connected.

[0012] Furthermore, there are two or more first gradually changing cavities and / or second gradually changing cavities, and the first gradually changing cavities and the second gradually changing cavities are arranged alternately in the vertical direction.

[0013] Furthermore, there are two or more first gradually changing cavities, and the maximum cross-section of each first gradually changing cavity gradually decreases from top to bottom.

[0014] Furthermore, the gradually changing cavity includes front, rear, left, and right four cavity walls. The left and right cavity walls of the gradually changing cavity are symmetrically arranged and gradually approach or gradually move away from each other from top to bottom. The front and rear cavity walls of the gradually changing cavity are vertical and parallel plane walls.

[0015] Furthermore, both the left and right cavity walls of the gradually changing cavity are S-shaped smooth curved surfaces.

[0016] Furthermore, the feed inlet is arranged on the left cavity wall and / or the right cavity wall of the uppermost gradually changing cavity.

[0017] Furthermore, the air separation chamber includes an air separation chamber main body. There is an air cavity penetrating through the front and rear on the air separation chamber main body. The air cavity includes the gradually changing cavity described above. The air separation chamber also includes a front side plate and a rear side plate fixed on the front and rear sides of the air separation chamber main body and respectively covering the front and rear ends of the air cavity. There are ventilation holes on the upper part of the front side plate, and an upper adjusting plate for covering the ventilation holes and capable of adjusting the covering degree is installed on the outer surface of the front side plate.

[0018] Furthermore, the front side plate is a transparent plate.

[0019] Furthermore, the lower end of the front side plate extends beyond the lower end of the air separation chamber main body. The air separation chamber also includes a left side plate and a right side plate respectively connected to the left and right sides of the lower end of the air separation chamber main body. A rotatable lower adjusting plate is installed between the left side plate and the right side plate. The left side plate, the right side plate, the lower adjusting plate, and the front side plate jointly enclose the described stem residue discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the embodiment of the stem residue air separation device of the present invention with the rear side plate removed;

[0021] Figure 2 is a front view of the embodiment of the stem residue air separation device of the present invention;

[0022] Figure 3 is a side view of the embodiment of the stem residue air separation device of the present invention;

[0023] Figure 4 This is the front view of the air separation chamber main body of the embodiment of the stem and stick air separation device of the present utility model.

[0024] In the figure: 1. fastening bolt; 2. air separation chamber; 21. air separation chamber main body; 22. front side plate; 23. rear side plate; 3. air cavity; 31. first tapered cavity A; 32. second tapered cavity A; 33. first tapered cavity B; 34. second tapered cavity B; 4. upper adjusting plate; 41. long hole; 5. fixing screw; 6. ventilation hole; 7. lower adjusting plate; 8. adjusting screw; 9. arc-shaped long hole; 10. left side plate; 11. right side plate; 12. stem and stick discharge port; 13. screw; 14. feed port; 15. cut tobacco discharge port. Specific embodiments

[0025] The features and performance of the present utility model will be further described in detail below in conjunction with the embodiments.

[0026] Aiming at the technical problems existing in the prior art, the basic technical concept of the present utility model is: the stem and stick air separation device includes an air separation chamber for separating stems and cut tobacco. A cut tobacco discharge port is arranged at the upper end of the air separation chamber, and a stem and stick discharge port is arranged at the lower end, facilitating the discharge of stems and cut tobacco. When the inner cavity of the air separation chamber only includes a tapered cavity with a gradually decreasing cross-section from top to bottom, according to the Venturi effect, the flow velocity of the air flow is the smallest when passing through the bottom of the tapered cavity. The cut tobacco containing stems entering the tapered cavity will be blown away by the fast air flow below and spread at the upper end of the tapered cavity, separating the lighter cut tobacco and rising with the air flow; when the inner cavity of the air separation chamber only includes a tapered cavity with a gradually increasing cross-section from top to bottom, according to the Venturi effect, the air flow velocity at the top of the tapered cavity is the largest, and the air flow velocity at the bottom is the smallest. The cut tobacco containing stems entering the tapered cavity is blown away by the fast air flow at the upper end of the tapered cavity. Among them, the lighter cut tobacco can rise with the air flow, and the remaining cut tobacco containing stems sinks and spreads in the larger space at the lower end of the tapered cavity. The dispersed lighter cut tobacco rises with the air flow, and the heavier cut tobacco containing stems or stems sink until they are discharged. When the inner cavity of the air separation chamber includes a tapered cavity with a gradually decreasing cross-section from top to bottom and a tapered cavity with a gradually increasing cross-section from top to bottom, the air separation chamber can combine the advantages of the two tapered cavities. The air speed in the air separation chamber will change multiple times, causing the cut tobacco containing stems entering the air separation chamber to rise and spread, descend and spread, and tumble violently under the action of the variable flow velocity, so that the stems and cut tobacco are more evenly dispersed, thereby improving the stem removal ratio.

[0027] An embodiment of the stem and stick air separation device of the present utility model:

[0028] As Figure 1As shown in the figure, the stem and cut tobacco separating device includes an air separation chamber 2 for separating stems and cut tobacco. The air separation chamber 2 is arranged in a cuboid structure. At the upper end of the air separation chamber 2, there is a cut tobacco discharge port 15 for discharging cut tobacco from the air separation chamber 2. At the lower end of the air separation chamber 2, there is a stem discharge port 12 for discharging stems from the air separation chamber 2, which is convenient for discharging stems and cut tobacco. On the side wall of the air separation chamber 2, there is a feed port 14 for the mixed material of stems and cut tobacco to enter the air separation chamber 2.

[0029] As Figure 1 , Figure 2 and Figure 4 shown in the figure, the inner cavity of the air separation chamber 2 includes at least one gradually decreasing cavity with a gradually decreasing cross-section from top to bottom and at least one gradually increasing cavity with a gradually increasing cross-section from top to bottom, and the feed port is arranged on the cavity wall of the uppermost gradually decreasing cavity. Define the gradually decreasing cavity with a gradually decreasing cross-section from top to bottom as the first gradually decreasing cavity, and define the gradually increasing cavity with a gradually increasing cross-section from top to bottom as the second gradually increasing cavity. The first gradually decreasing cavity and the second gradually increasing cavity are arranged up and down and their cavity walls are directly connected. According to the Venturi effect, when the fluid passes through the reduced cross-section of the flow passage, the fluid velocity increases, and the velocity is inversely proportional to the size of the cross-section of the flow passage. Therefore, the air flow velocity at the lower end of the first gradually decreasing cavity is the largest, and the air flow velocity at the upper end is the smallest. The cut tobacco containing stems entering the first gradually decreasing cavity will be blown away by the fast air flow at the lower end and diffuse at the upper end of the first gradually decreasing cavity; the air flow velocity at the upper end of the second gradually increasing cavity is the largest, and the air flow velocity at the lower end is the smallest. The cut tobacco containing stems entering the second gradually increasing cavity will be blown away by the fast air flow at the upper end and diffuse at the lower end of the second gradually increasing cavity, and the air speed inside the air separation chamber 2 can be changed multiple times under the action of multiple gradually decreasing and increasing cavities.

[0030] In this embodiment, there are two or more first gradually decreasing cavities and two or more second gradually increasing cavities, and the first gradually decreasing cavities and the second gradually increasing cavities are arranged alternately in the up and down direction. Specifically, as Figure 4As shown, there are two first tapered cavities and two second tapered cavities. The dotted lines in the figure are the boundaries between the vertically adjacent first and second tapered cavities. From bottom to top, they are the first tapered cavity A31, the second tapered cavity A32, the first tapered cavity B33, and the second tapered cavity B34. The optimal arrangement is that the first and second tapered cavities are alternately arranged in the vertical direction. When the air flow in the air separation chamber 2 flows from bottom to top, the change in the air flow velocity is alternately large and small. During use, the cut tobacco with stems enters the air separation chamber 2 and will be dispersed by the air flow in the second tapered cavity B34 and diffuse at the lower end of the second tapered cavity B34. Among them, the lighter cut tobacco rises with the air flow, and the heavier stem pieces or cut tobacco clusters with stems fall; after the stem pieces or cut tobacco clusters with stems enter the first tapered cavity B33, they will be dispersed again by the fast air flow at the lower end of the first tapered cavity B33 and diffuse at the upper end of the first tapered cavity B33. Among them, the lighter cut tobacco rises with the air flow, and the heavier stem pieces or cut tobacco clusters with stems continue to fall; when the stem pieces or cut tobacco clusters with stems enter the second tapered cavity B32, they diffuse at the lower end of the second tapered cavity B32, causing the lighter cut tobacco among them to rise with the air flow and the heavier stem pieces or cut tobacco clusters with stems to fall; when the heavier stem pieces or cut tobacco clusters with stems enter the first tapered cavity B31, they are dispersed by the fast air flow at the lower end of the first tapered cavity B31 and diffuse at the upper end of the first tapered cavity B31. The lighter cut tobacco mixed in it rises with the air flow, and the remaining stem pieces or cut tobacco clusters with stems sink and are discharged. Therefore, the cut tobacco with stems can undergo multiple upward and downward diffusions in the air separation chamber 2 and tumble violently under the action of variable wind speeds, making the stem pieces and cut tobacco evenly dispersed, thereby increasing the removal ratio of stem pieces.

[0031] As Figures 1-4 shown, the tapered cavity includes four cavity walls, namely the front, rear, left, and right. And the left and right cavity walls of the tapered cavity are symmetrically arranged. Among them, as Figure 2 and 4 shown, the left and right cavity walls of the first tapered cavity A31 and the first tapered cavity B33 gradually approach each other from top to bottom, and the left and right cavity walls of the second tapered cavity A32 and the second tapered cavity B34 gradually move away from each other from top to bottom. As Figure 1 and Figure 3 shown, the front and rear cavity walls of each tapered cavity are vertical and parallel plane walls. In this embodiment, the left and right cavity walls of each tapered cavity are S-shaped smooth curved surfaces to reduce the collision of cut tobacco with the inner wall of the air separation chamber 2, reduce the loss caused by cut tobacco breakage, and will not block the upward or downward movement of stem pieces and cut tobacco.

[0032] As Figure 1 and Figure 3As shown, the feed inlet 14 is located on the cavity wall of the second tapered cavity B34. At this time, the cut tobacco with stems can enter from the upper end of the air separation chamber 2, so that the heavier stem pieces and cut tobacco pass through more tapered cavities. In this embodiment, only one feed inlet 14 is provided. Taking the side where the feed inlet 14 is provided as the right side, the feed inlet 14 is provided on the right cavity wall of the second tapered cavity B34. As Figure 2 and 4 shown, the maximum cross-section of the first tapered cavity A31 is smaller than that of the first tapered cavity B33, which can make the wind speed in the lower part of the inner cavity of the air separation chamber 2 relatively large, so that the cut tobacco with stems sinking faces a faster airflow and is dispersed, thereby making the stem pieces and cut tobacco more evenly dispersed and increasing the proportion of stem piece removal.

[0033] As Figure 1 shown, the air separation chamber 2 further includes an air separation chamber main body 21. A wind cavity 3 that penetrates through the front and back is provided on the air separation chamber main body 21. A front side plate 22 and a rear side plate 23 that seal the front and rear ends of the wind cavity 3 are respectively provided on the front and rear sides of the air separation chamber 2. The wind cavity 3, the front side plate 22 and the rear side plate 23 together enclose the inner cavity of the air separation chamber 2. During production and manufacturing, the air separation chamber main body 21, the front side plate 22 and the rear side plate 23 can be manufactured separately, reducing the manufacturing difficulty.

[0034] As Figures 1-3 shown, the front side plate 22 and the rear side plate 23 are respectively fixed on the air separation chamber main body 21 through a plurality of fastening bolts 1. In this embodiment, two fastening bolts 1 are respectively provided on the front side plate 22 and the rear side plate 23, and the fastening bolts 1 are respectively located at the two corners at the upper end of the front side plate 22 or the rear side plate 23. The tops of the front side plate 22 and the rear side plate 23 are flush with the top of the air separation chamber main body 21. The left side surfaces of the front side plate 22 and the rear side plate 23 and the right side surfaces of the front side plate 22 and the rear side plate 23 are respectively flush with the left end surface and the right end surface of the air separation chamber main body 21, and the bottom of the rear side plate 23 is flush with the bottom of the air separation chamber main body 21 to avoid the front side plate 22 and the rear side plate 23 occupying too much space. Among them, the front side plate 22 is set as a transparent plate, such as a glass plate, an acrylic plate, etc., and the dispersion situation of the stem pieces and cut tobacco in the air separation chamber 2 can be observed through the transparent front side plate 22.

[0035] As Figure 3 shown, the lower end of the front side plate 22 extends beyond the lower end of the air separation chamber main body 21. As Figure 1 shown, the air separation chamber 2 further includes a left side plate 10 and a right side plate 11 respectively connected to the left and right sides of the lower end of the air separation chamber main body 21. The rear end surfaces of the left side plate 10 and the right side plate 11 are flush with the rear side plate 23. The left end surface of the left side plate 10 is flush with the left end surface of the air separation chamber 2, and the right end surface of the right side plate 11 is flush with the right end surface of the air separation chamber 2, so that the left side plate 10 and the right side plate 11 do not protrude from the air separation chamber main body 21, avoiding occupying too much space.

[0036] A rotatable lower adjusting plate 7 is installed between the left side plate 10 and the right side plate 11. The left side plate 10, the right side plate 11, the lower adjusting plate 7 and the front side plate 22 together enclose the stem waste discharge port 12, and the stem waste discharge port 12 also serves as the lower air inlet of the air separation chamber 2. The lower adjusting plate 7 is hingedly arranged with the left side plate 10 and the lower adjusting plate 7 and the right side plate 11 respectively through screws 13. The screws 13 are arranged at the upper ends of the left and right sides of the lower adjusting plate 7, and threaded holes for threaded cooperation with the corresponding screws 13 are respectively arranged at the corresponding positions on the left and right sides of the lower adjusting plate 7. Through holes for the corresponding screws 13 to penetrate are respectively arranged at the corresponding positions on the tops of the left side plate 10 and the right side plate 11. During use, the screws 13 can be slightly loosened to enable the lower adjusting plate to rotate between the left and right side plates.

[0037] As Figure 1 and Figure 3 shown, arc-shaped long holes 9 for adjusting different positions of the lower adjusting plate 7 are arranged on both the left side plate 10 and the right side plate 11. The centers of the circles where the arc-shaped long holes 9 on the two side plates are located coincide with the centers of the corresponding screws 13 on the lower adjusting plate 7. In this embodiment, the central angles of the arc-shaped long holes 9 are both set to 90 degrees, and the connecting lines between the two ends of the arc-shaped long holes 9 and the centers of the circles where they are located are respectively horizontal and vertical lines, so that the adjustment stroke of the lower adjusting plate 7 has a fully open position when in the vertical state and a fully closed position when in the horizontal state.

[0038] The lower adjusting plate 7 is fixed to the corresponding side plate through a threaded fastener passing through the arc-shaped long hole 9, and the connection position between the lower adjusting plate 7 and the threaded fastener is located at the end of the lower adjusting plate 7 far from the hinge center. In this embodiment, the threaded fastener is set as an adjusting screw 8, and threaded holes for threaded cooperation with the corresponding adjusting screws 8 are arranged at the corresponding positions on the left and right sides of the lower adjusting plate 7. The heads of the adjusting screws 8 are used to press against the left side plate 10 and the right side plate 11. During use, by loosening the adjusting screws 8, the lower adjusting plate 7 can be rotated between the left side plate 10 and the right side plate 11, thereby adjusting the opening degree of the lower air inlet and realizing the adjustment of the air speed in the air separation chamber 2. When the lower adjusting plate 7 does not rotate, the lower adjusting plate 7 is in the vertical state, at this time the lower air inlet is fully open and the air intake volume is the largest; when the lower adjusting plate 7 rotates 90°, the lower adjusting plate 7 is in the horizontal state, at this time the lower air inlet is fully closed and the air intake volume is the smallest, zero.

[0039] As Figure 1 and Figure 2 shown, ventilation holes 6 are arranged in the upper part of the front side plate 22. The ventilation holes 6 are arranged as strip-shaped holes and there are six, as Figure 2As shown, the ventilation holes 6 are of the same size, with their upper and lower ends flush and evenly spaced. An upper adjusting plate 4 for covering the ventilation holes 6 and capable of adjusting the covering degree is installed at the corresponding position on the outer surface of the front side plate 22. In this embodiment, the upper adjusting plate 4 is connected to the front side plate 22 by fixing screws 5. A long hole 41 for the fixing screw 5 to pass through is provided at the center line of the upper adjusting plate 4. The length of the long hole 41 is equal to the length of the ventilation hole 6, and the extending direction of the ventilation hole 6 is the same as that of the long hole 41. The long hole 41 on the upper adjusting plate 4 corresponds to the solid part between the middle two ventilation holes 6, and the ventilation holes 6 are symmetrically arranged on both sides of the solid part. When the upper adjusting plate 4 completely covers the ventilation hole 6, the long hole 41 is aligned with the solid part to ensure no air leakage. Threaded holes are provided at the corresponding positions on the front side plate 22. The threaded holes are threaded holes and can be in threaded cooperation with the fixing screws 5. The threaded holes are located outside the lower ends of the ventilation holes 6, so that when the upper adjusting plate 4 moves to the lowest position, the ventilation holes 6 are completely open, and at this time, the upper edge of the upper adjusting plate 4 is flush with the lower ends of the ventilation holes 6.

[0040] The size of the upper adjusting plate 4 and the size of the long hole 41 are such that the ventilation holes 6 can be completely covered and completely opened. In use, loosen the fixing screw 5, and the position of the upper adjusting plate 4 relative to the front side plate 22 can be moved, so as to adjust the area of the ventilation holes 6 covered by the upper adjusting plate 4. During the adjustment process, the air intake volume at the ventilation holes 6 can change continuously, enabling stepless adjustment of the wind speed in the air separation chamber 2. When the upper adjusting plate 4 moves to a suitable position, tighten the fixing screw 5 to fix the upper adjusting plate 4. When the upper adjusting plate 4 moves to the lowest position, the upper adjusting plate 4 completely opens the ventilation holes 6, and the ventilation holes 6 are completely open; when the upper adjusting plate 4 moves to the highest position, the upper adjusting plate 4 completely covers the ventilation holes 6, and the ventilation holes 6 are completely closed.

[0041] During use: The stem-containing tobacco enters the air separation chamber 2 from the feed inlet 14, and then is dispersed by the airflow in the second tapered chamber B34 and diffuses at the lower end in the second tapered chamber B34. Among them, the lighter tobacco rises with the airflow to the tobacco discharge port 15 and is discharged, while the heavier stem pieces or stem-containing tobacco clusters fall; after the stem pieces or stem-containing tobacco clusters sink into the first tapered chamber B33, they will be dispersed again by the rapid airflow at the lower end of the first tapered chamber B33 and diffuse at the upper end in the first tapered chamber B33. Among them, the lighter tobacco rises with the airflow to the tobacco discharge port 15 and is discharged, and the heavier stem pieces or stem-containing tobacco clusters continue to fall; after the stem pieces or stem-containing tobacco clusters sink into the second tapered chamber B32, they diffuse at the lower end of the second tapered chamber B32, enabling the lighter tobacco among them to rise with the airflow to the tobacco discharge port 15 and be discharged, while the heavier stem pieces or stem-containing tobacco clusters fall; the heavier stem pieces or stem-containing tobacco clusters sink into the first tapered chamber B31 and are dispersed by the rapid airflow at the lower end of the first tapered chamber B31 and diffuse at the upper end in the first tapered chamber B31. The lighter tobacco mixed in it rises with the airflow to the tobacco discharge port 15 and is discharged, and the remaining stem pieces or stem-containing tobacco clusters sink to the stem piece discharge port 12 and are discharged, realizing the separation of stem pieces and tobacco. By allowing the stem-containing tobacco to rise and disperse, and fall and disperse multiple times in the air separation chamber 2, the tobacco and stem pieces are dispersed more evenly, so that the stem pieces can be separated better, and thus the stem piece rejection ratio is improved. At the same time, after the stem-containing tobacco enters the air separation chamber 2, by adjusting the area of the upper adjusting plate 4 covering the ventilation holes 6 and cooperating with adjusting the position of the lower adjusting plate 7 to adjust the opening degree of the lower air inlet, the air speed in the air separation chamber 2 is jointly adjusted. At this time, the dispersion of stem pieces and tobacco in the air separation chamber 2 and the sorting result can be observed through the front side plate 22, and the upper adjusting plate 4 and the lower adjusting plate 7 are adjusted accordingly.

[0042] In other embodiments, when setting the structure of the air separation chamber, the lower adjusting plate may not be provided. At this time, the left and right side plates may also not be provided, and at the same time, the lower end of the front side plate is flush with the lower end of the air separation chamber main body, and the lower end of the entire air separation chamber is open.

[0043] In other embodiments, the front side plate may not be set as a transparent plate, such as being set as a metal plate.

[0044] In other embodiments, when setting the structure of the air separation chamber, the air separation chamber main body, the front side plate, and the rear side plate may be integrally provided. At this time, the ventilation holes and the upper adjusting plate may not be provided.

[0045] In other embodiments, when setting the position of the feed inlet on the chamber wall of the uppermost tapered chamber, the feed inlet may be set on the left chamber wall of the uppermost tapered chamber. Two feed inlets may also be provided. At this time, the feed inlets may be respectively set on the left chamber wall and the right chamber wall of the uppermost tapered chamber.

[0046] In other embodiments, when setting the structures of the left and right cavity walls of the tapered cavity, the left and right cavity walls of the tapered cavity can both be set as inclined planes. At this time, the left and right cavity walls of the first tapered cavity are in an inverted "V" shape, and the left and right cavity walls of the second tapered cavity are in a "V" shape.

[0047] In other embodiments, when setting the structure of the tapered cavity, the tapered cavity can be set as a frustum structure.

[0048] In other embodiments, when setting the size of the first tapered cavity, if there are more than two first tapered cavities, the maximum cross-sections of each first tapered cavity can be set to the same size.

[0049] In other embodiments, when setting the number and arrangement of the first tapered cavity and the second tapered cavity, only one first tapered cavity can be set. At this time, two second tapered cavities are set, and the first tapered cavity is located between the two second tapered cavities; or only one second tapered cavity can be set. At this time, two first tapered cavities are set, and the second tapered cavity is located between the two first tapered cavities; or more than three first tapered cavities and more than three second tapered cavities can be set, and the difference between the number of the first tapered cavities and the number of the second tapered cavities does not exceed one, so that the first tapered cavities and the second tapered cavities are arranged alternately in the vertical direction.

[0050] In other embodiments, there can also be only one first tapered cavity and one second tapered cavity respectively. At this time, the first tapered cavity can be above or below the second tapered cavity.

[0051] In other embodiments, when setting the structure of the tapered cavity in the air separation chamber interior, the first tapered cavity and the second tapered cavity are arranged vertically. The cavity walls of adjacent first and second tapered cavities may not be directly connected, and a straight pipe section can be provided between the adjacent first and second tapered cavities.

[0052] In other embodiments, when setting the structure of the tapered cavity in the air separation chamber interior, the second tapered cavity can be not set, and only the first tapered cavity is set. The number of the first tapered cavities can be only one, or of course, there can be more than two. When there are multiple first tapered cavities, the first tapered cavities are arranged vertically, and the cavity walls of adjacent first tapered cavities can be directly connected or there can be a straight pipe for transition.

[0053] In other embodiments, when setting the tapered cavity structure in the air separation chamber cavity, the first tapered cavity may not be provided, and only the second tapered cavity is provided. The number of the second tapered cavities may be only one, or of course, there may be more than two. When there are multiple second tapered cavities, the second tapered cavities are arranged vertically. The cavity walls of adjacent second tapered cavities may be directly connected or there may be a straight pipe transition. In other embodiments, when setting the position of the feed inlet, when the inner cavity of the air separation chamber includes a tapered cavity (a tapered cavity with a gradually increasing cross-section from top to bottom or a tapered cavity with a gradually decreasing cross-section from top to bottom), the feed inlet may be set above the tapered cavity or on the cavity wall of the tapered cavity; when the inner cavity of the air separation chamber includes more than two tapered cavities (a tapered cavity with a gradually increasing cross-section from top to bottom and / or a tapered cavity with a gradually decreasing cross-section from top to bottom), the feed inlet may be set above each tapered cavity or on the cavity wall of the uppermost tapered cavity.

[0054] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions recorded in the foregoing embodiments without creative efforts, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Stem label air separation device, characterized in that: It includes an air separation chamber for separating stem tags and cut tobacco. An inlet for the mixed material of stem tags and cut tobacco to enter the air separation chamber is provided on the side wall of the air separation chamber. A cut tobacco discharge port for discharging cut tobacco from the air separation chamber is provided at the upper end of the air separation chamber. A stem tag discharge port for discharging stem tags from the air separation chamber is provided at the lower end of the air separation chamber. The inner cavity of the air separation chamber includes at least one gradually decreasing cavity with a gradually decreasing cross-section from top to bottom and / or at least one gradually increasing cavity with a gradually increasing cross-section from top to bottom. The inlet is located above each gradually changing cavity or the inlet is provided on the cavity wall of the uppermost gradually changing cavity.

2. The stick tag air separation device according to claim 1, characterized in that: The inner cavity of the air separation chamber includes at least one gradually decreasing cavity with a gradually decreasing cross-section from top to bottom and at least one gradually increasing cavity with a gradually increasing cross-section from top to bottom. The gradually decreasing cavity with a gradually decreasing cross-section from top to bottom is the first gradually changing cavity, and the gradually increasing cavity with a gradually increasing cross-section from top to bottom is the second gradually changing cavity. The first gradually changing cavity and the second gradually changing cavity are arranged up and down and their cavity walls are directly connected.

3. The stick separator according to claim 2, wherein: There are two or more first gradually changing cavities and / or second gradually changing cavities, and the first gradually changing cavities and the second gradually changing cavities are alternately arranged in the up-down direction.

4. The stem tag air classification device according to claim 3, characterized in that: There are two or more first gradually changing cavities, and the maximum cross-section of each first gradually changing cavity gradually decreases from top to bottom.

5. The stick signature air separation device according to any one of claims 1-4, characterized in that: The gradually changing cavity includes four cavity walls, namely front, rear, left, and right. The left and right cavity walls of the gradually changing cavity are symmetrically arranged and gradually approach or gradually move away from each other from top to bottom. The front and rear cavity walls of the gradually changing cavity are vertical and parallel plane walls.

6. The stick tag air separation device according to claim 5, wherein: Both the left and right cavity walls of the gradually changing cavity are S-shaped smooth curved surfaces.

7. The stem tag air separation device according to claim 5, characterized in that: The inlet is provided on the left cavity wall and / or the right cavity wall of the uppermost gradually changing cavity.

8. The stick label air separation device according to any one of claims 1-4, characterized in that: The air separation chamber includes an air separation chamber main body. An air cavity penetrating from front to back is provided on the air separation chamber main body. The air cavity includes the above-mentioned gradually changing cavity. The air separation chamber further includes a front side plate and a rear side plate fixed on the front and rear sides of the air separation chamber main body respectively to cover the front and rear ends of the air cavity. A ventilation hole is provided in the upper part of the front side plate, and an upper adjusting plate for covering the ventilation hole and capable of adjusting the covering degree is installed on the outer surface of the front side plate.

9. The stem label air classification device according to claim 8, characterized in that: The front side plate is a transparent plate.

10. The stem label air separation device according to claim 8, characterized in that: The lower end of the front side plate extends beyond the lower end of the air separation chamber main body. The air separation chamber further includes a left side plate and a right side plate respectively connected to the left and right sides of the lower end of the air separation chamber main body. A rotatable lower adjusting plate is installed between the left side plate and the right side plate. The left side plate, the right side plate, the lower adjusting plate, and the front side plate jointly enclose the above-mentioned stem tag discharge port.

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