CN117654899A

CN117654899A - Three-stage winnowing device

Info

Publication number: CN117654899A
Application number: CN202311722117.6A
Authority: CN
Inventors: 钟宴雄; 陈凯城; 管拔; 邓达; 肖柳宝; 李秋章; 林迪; 杨文生; 赖苑军; 张志文; 钟裕隆; 杨海涛
Original assignee: China Tobacco Guangdong Industrial Co Ltd
Current assignee: China Tobacco Guangdong Industrial Co Ltd
Priority date: 2023-12-14
Filing date: 2023-12-14
Publication date: 2024-03-08

Abstract

The invention belongs to the technical field of tobacco processing, and discloses a three-stage air separation device, which comprises a first air separation box, a second air separation box, a third air separation box and a main conveying belt, wherein a mixture sequentially passes through the first air separation box, the second air separation box and the third air separation box, a first loosening roller breaks up the mixture, the first loosening roller divides the volume of dry tobacco shreds, the dry tobacco shreds are conveyed into an air pipe by the second air separation box, a second conveying belt inputs the dry tobacco shreds into a second loosening member, the second loosening member breaks up the dry tobacco shreds to form dry tobacco shreds, the second conveying belt conveys the dry tobacco shreds into the third air separation box, the third air separation box discharges stem sticks and conveys the dry tobacco shreds into the main conveying belt; solves the problem that the tobacco quality is reduced because part of wet-ball tobacco shreds are mixed into the main tobacco shreds after secondary air separation in the prior art.

Description

Three-stage winnowing device

Technical Field

The invention relates to the technical field of tobacco processing, in particular to a three-stage winnowing device.

Background

When the tobacco shred is processed, as the tobacco shred is internally mixed with the coarse stem sticks, the fine stem sticks, the dry tobacco shred clusters, the wet tobacco shred clusters and scattered dry tobacco shreds, the tobacco shred is required to be winnowed, the dry tobacco shred clusters and the scattered dry tobacco shreds are conveyed to the next procedure to form main tobacco shreds, so that the stem sticks in the tobacco shred are screened out, a secondary air separation system is commonly adopted in the industry, an important effect is achieved for further improving the purity of the tobacco shred, and the stem stick rate in the tobacco shred is further reduced through twice winnowing, so that the tobacco shred becomes purer.

However, the disadvantage is also obvious, even though the wet mass tobacco shreds in the dry tobacco shreds cannot be effectively removed through twice air separation, after the finished cigarette is produced, due to certain moisture, certain yellow spots are generated on the outer skin of the cigarette, so that the quality of the cigarette is deteriorated, if the tobacco shreds are processed through the first-stage air separation, the large wet mass can be removed in the first-stage air separation, but the stem label rate in the tobacco shreds is too high, the dry mass tobacco shreds cannot enter the next production line to cause the tobacco shred waste, after the second-stage air separation, the dry mass tobacco shreds need to be loosened by adopting a mass removing mechanism before the tobacco shreds enter the second-stage air separation box, and more dry tobacco shreds can be collected through the second-stage air separation after the dry mass removing tobacco shreds are scattered, however, under the action of the mass removing mechanism, the wet mass tobacco shreds are also scattered and are mixed in the dry tobacco shreds in a large amount, and the dry tobacco shreds cannot be sucked by the second-stage air separation box because the dry tobacco shreds are mutually interweaved, so that the wet dry tobacco shreds cannot enter the second-stage air separation box, and the wet tobacco shred removal rate is finally improved, the wet tobacco shred removal rate is increased, and the probability of entering the wet tobacco process is lowered, and the main tobacco shred mixing process is lowered.

Disclosure of Invention

The invention aims to provide a three-stage winnowing device, which solves the problem that in the prior art, partial wet-mass tobacco shreds are mixed into a main tobacco shred processing procedure after secondary winnowing, so that the quality of cigarettes is reduced.

To achieve the purpose, the invention adopts the following technical scheme: the invention provides a three-stage winnowing device which comprises a first winnowing box, a second winnowing box, a third winnowing box and a main conveying belt, wherein a mixture sequentially passes through the first winnowing box, the second winnowing box and the third winnowing box, the mixture comprises dry tobacco shreds, wet tobacco shreds and stem sticks, the first winnowing box sucks part of the dry tobacco shreds onto the main conveying belt, a first conveying belt is arranged between the first winnowing box and the second winnowing box, the mixture falling from the first winnowing box is conveyed onto the first conveying belt, the first conveying belt is conveyed into the second winnowing box, a first loosening roller is arranged at the bottom of the second winnowing box, the first loosening roller is used for partitioning the volume of the dry tobacco shreds, the dry tobacco shreds and the dry tobacco shreds are blown into an air pipe by the second winnowing box, a second conveying belt is arranged at the lower side of the air pipe, the second conveying belt is used for conveying the dry tobacco shreds into the second conveying belt by the second conveying belt, and the second conveying belt is arranged at the lower side of the second winnowing box, and the second conveying belt is used for loosening the dry tobacco shreds to form a third conveying belt;

the second loosening member comprises a first carding roller and a second carding roller, conical nails are distributed on the outer wall of the first carding roller at equal intervals, the conical nail density of the first carding roller and the conical nail density of the second carding roller are larger than those of the first loosening roller, the first carding roller and the second carding roller reversely rotate and the conical nails are staggered with each other, the suction force of the second winnowing box is smaller than the weight of wet tobacco clusters in the second winnowing box, and the suction force of the third winnowing box is smaller than the weight of stem sticks in the third winnowing box.

Preferably, a first vibration groove is arranged at the tail end of the first conveying belt, the other end of the first vibration groove is communicated with the second winnowing box, the first vibration groove spreads the mixture to be thin through vibration, a first conveying belt is arranged on the first vibration groove, and the first conveying belt conveys the mixture into the second winnowing box.

Preferably, a first material throwing roller is arranged at the middle section of the second winnowing box, and the first material throwing roller throws the mixture into the second winnowing box.

Preferably, the first vibrating screen is obliquely arranged at the bottom of the second winnowing box, an opening is arranged on the side wall of the second winnowing box, which is close to the lower side of the first vibrating screen, a recovery box is arranged on the opening, the first vibrating screen discharges the stem sticks and the wet tobacco shreds into the recovery box, and the first loosening roller is arranged at the bottom of the second winnowing box, which is far away from one side of the first throwing roller.

Preferably, a second vibrating groove is arranged on the lower side of the second conveyor belt, a second conveyor belt is arranged on the second vibrating groove, and the second conveyor belt conveys the dry tobacco shreds into the third winnowing box.

Preferably, a second throwing roller is mounted on the side wall of the middle section of the third winnowing box, and the second throwing roller throws the dry tobacco shreds into the third winnowing box from the second conveying belt.

Preferably, the bottom of the third winnowing box is obliquely provided with a second vibrating screen, the side wall of the third winnowing box is provided with a discharge port, the discharge port is arranged on one side of the second vibrating screen, which is lower, and the stem sticks are discharged from the discharge port.

Preferably, a first airlock is arranged at the tail end of the air pipe, the first airlock is used for recycling the dry tobacco shreds, the first airlock is arranged at the upper side of the second conveyor belt, and the dry tobacco shreds, the wet tobacco shreds and the dry tobacco shreds fall on the second conveyor belt.

Preferably, the upper side of the third winnowing box is communicated with a recovery pipe, a second airlock is arranged on the recovery pipe, the second airlock is used for recovering the dry tobacco shreds, a recovery port is arranged on the lower side of the second airlock, and the main conveying belt is arranged on the lower side of the recovery port.

The beneficial effects are that: through setting up first selection by winnowing case, second selection by winnowing case and third selection by winnowing case, firstly screen out a large amount of dry tobacco silk through first selection by winnowing case, afterwards because the toper nail density of first comb silk roller and second comb silk roller is greater than the toper nail density of first loose roller, so first loose roller can cut apart the dry tobacco silk group and make its volume diminish, be convenient for by the second selection by winnowing incasement absorption to the third selection by winnowing incasement, wet tobacco silk group can directly drop the bottom of second selection by winnowing case owing to the weight is heavier, and because the suction of second selection by winnowing incasement selection by winnowing can not draw the wet tobacco silk group of second selection by winnowing incasement, make wet tobacco silk group unable entering third selection by winnowing case, afterwards a small amount of stem and small dry tobacco silk are scattered once more through the loose component of second, become dry tobacco silk, so directly absorb dry tobacco silk through the third selection by winnowing case and carry on the main conveyer belt, make the tobacco silk of final screening purer, the content of stem is further reduced.

Drawings

FIG. 1 is a main view of a second air box and a third air box of the present invention;

FIG. 2 is a main view of a first air separation box according to the present invention;

FIG. 3 is a cross-sectional view of a second loosening element of the present invention;

FIG. 4 is a partial block diagram of a second air classification box according to the present invention.

In the figure: 1. a first air separation box; 2. a second air separation box; 3. a third winnowing box; 4. a main conveyor belt; 5. a first conveyor belt; 6. a first loosening roller; 7. an air duct; 8. a second conveyor belt; 9. a second loosening member; 91. a first godet; 92. a second godet; 10. conical nails; 11. a first vibrating trough; 12. a first material throwing roller; 13. a first vibrating screen; 14. a recovery box; 15. a second vibrating trough; 16. a second material throwing roller; 17. a second vibrating screen; 18. a first airlock; 19. a second airlock; 20-arc grooves.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Under the prior art, in order to make screening more pipe tobacco, reduce the loss, will break up the mixture, break up in-process wet pipe tobacco group also can be broken up, and wet pipe tobacco and the dry pipe tobacco of wherein will get into in the next production process simultaneously, lead to the quality of pipe tobacco to become low, simultaneously because wet pipe tobacco quality is great, with the crimping of dry pipe tobacco in the bottom, make the second grade wind select box can't upwards suck the pipe tobacco through the form of selection by winnowing, further caused the loss of pipe tobacco.

In order to solve the above problems, as shown in fig. 1 to 4, the present invention provides a three-stage air separation device, which comprises a first air separation box 1, a second air separation box 2, a third air separation box 3 and a main conveyor belt 4, wherein the mixture sequentially passes through the first air separation box 1, the second air separation box 2 and the third air separation box 3, the mixture comprises dried tobacco shreds, wet tobacco shreds and stem sticks, the first air separation box 1 conveys part of the dried tobacco shreds onto the main conveyor belt 4, a first conveyor belt 5 is installed between the first air separation box 1 and the second air separation box 2, the first conveyor belt 5 conveys the mixture falling from the first air separation box 1 into the second air separation box 2, a first loosening roller 6 is installed at the bottom end of the second air separation box 2, the first loosening roller 6 divides the dried tobacco shreds, the dried tobacco shreds and the second air separation box 2 into dry tobacco shreds into air pipes 7, a second conveyor belt 8 is installed at the lower side of the air pipes 7, the second conveyor belt 8 conveys part of the dried tobacco shreds into a second conveyor belt 9, the second conveyor belt 9 is installed at the lower side of the second air separation box 9, the second conveyor belt 3 is conveyed by the third conveyor belt 3, and the dried tobacco shreds 3 is conveyed by the second conveyor belt 9;

the second loosening element 9 comprises a first carding roller 91 and a second carding roller 92, conical nails 10 are distributed on the outer walls of the first carding roller 91, the second carding roller 92 and the first loosening roller 6 at equal intervals, the density of the conical nails 10 of the first carding roller 91 and the second carding roller 92 is greater than that of the conical nails 10 of the first loosening roller 6, the first carding roller 91 and the second carding roller 92 reversely rotate and the conical nails 10 are staggered with each other, the suction force of the second winnowing box 2 is smaller than the weight of wet tobacco clusters in the second winnowing box 2, and the suction force of the third winnowing box 3 is smaller than the weight of stem sticks in the third winnowing box 3.

It should be noted that, the stem sticks are divided into coarse stem sticks and fine stem sticks, the coarse stem sticks and the fine stem sticks can be discharged from the second winnowing box, and a small amount of fine stem sticks can be screened out from the bottom of the third winnowing box.

The second loosening member 9 adopted by the invention is a loosening member in the prior art, the first carding roller 91 and the second carding roller 92 are meshed with each other, the dry tobacco shreds can fall on the first carding roller 91, the second carding roller 92 rotates at a higher speed, the clusters on the first carding roller 91 can be stripped, all the clusters on the first carding roller 91 are directly separated, the density of the conical nails 10 is the lowest, and the scattered tobacco shreds still have partial tobacco shreds.

It should be noted that, because the wet tobacco shred clusters have certain moisture, the weight of the wet tobacco shreds is far higher than that of the dry tobacco shreds in unit volume, the wet tobacco shred clusters directly fall to the bottom after entering the second winnowing box 2 and are separated from the dry tobacco shred clusters, the dry tobacco shred clusters can fly for a long distance under the action of the first throwing roller 12, in addition, the working principle of the winnowing box is the prior art, objects with different weights are screened through the wind power size, substances heavier than the wind power fall, substances lighter than the wind power rise, and the principle is not repeated.

Firstly, the mixture firstly passes through a first winnowing box 1, the structure principle of the first winnowing box 1 is similar to that of the prior art, the structure principle is not repeated, the main purpose is to winnow the dry tobacco with the highest content in the mixture, send the dry tobacco to a main conveying belt 4 by wind, then the left mixture is conveyed to the direction of a second winnowing box 2 through a first conveying belt 5, convey the mixture into the second winnowing box 2, after entering the second winnowing box 2, a first loosening roller 6 is arranged at the bottom of the second winnowing box 2 and is positioned at one side far from a first throwing roller 12, wet tobacco clusters, coarse stems and a large number of fine stems can fall directly to the bottom of the second winnowing box 2, then the dry tobacco clusters can fall into the first loosening roller 6, as an arc-shaped groove 20 is formed in the first loosening roller 6, the dry tobacco clusters are continuously stirred and cut in the arc-shaped groove 20, the density of the conical nails 10 on the first loosening roller 6 is lower, so that the dried tobacco shreds are divided into small parts and cannot be scattered, then, as the second winnowing box 2 only can absorb the dried tobacco shreds, but the wet tobacco shreds have heavier weight and cannot be recovered, the wet tobacco shreds and the mixture can be separated, the wet tobacco shreds in the mixture cannot enter the third winnowing box 3, the quality of the screened tobacco shreds is improved, the tobacco shreds are completely scattered through the first carding roller 91 and the second carding roller 92 to become a mixture of the dried tobacco shreds and a small amount of fine stems, the air door of the third winnowing box 3 is adjusted, the dried tobacco shreds with lighter quality can be recovered, the finer stems are remained in the third winnowing box 3, the dried tobacco stems in the third winnowing box 3 cannot be entangled with each other due to the lower proportion of the stems, the stems are removed through a three-stage winnowing mode, so that as much of the cut tobacco as possible is recovered onto the main conveyor belt 4.

According to the invention, the tail end of the first conveyor belt 5 is provided with the first vibration groove 11, the other end of the first vibration groove 11 is communicated with the second winnowing box 2, the first vibration groove 11 spreads the mixture thin through vibration, the mixture is prevented from caking, the first material throwing roller 12 can uniformly throw the mixture into the second winnowing box 2, further the winnowing efficiency is higher, the first conveyor belt is arranged on the first vibration groove 11, and the first conveyor belt sends the mixture into the second winnowing box 2.

The first material roller 12 of throwing is installed to the middle section of second selection by winnowing box 2, and first material roller 12 throws into second selection by winnowing box 2 with the mixture, and wet tobacco shred group, stalk are signed because weight is heavier so flight distance is nearer, and the distance that the dry tobacco shred group flies is farther can fall into arc wall 20 and is ceaselessly turned over by first loose roller 6 and stir and break up, spill the mixture evenly into second selection by winnowing box 2 in, can make the efficiency of selection by winnowing higher, and stalk is signed, wet tobacco shred group and impurity can fall fast.

According to the invention, the first vibrating screen 13 is obliquely arranged at the bottom of the second winnowing box 2, an opening is arranged on one side, close to the lower side of the first vibrating screen 13, of the side wall of the second winnowing box 2, a recovery box 14 is arranged on the opening, the first vibrating screen 13 discharges stem sticks and wet tobacco shreds into the recovery box 14, the dry tobacco shreds and dry tobacco shreds in the fallen mixture can be stirred again through continuous shaking of the second vibrating screen 17, so that the dry tobacco shreds can be sucked into the air pipe 7 by the second winnowing box 2, the wet tobacco shreds, the thick stem sticks and a large number of thin stem sticks can slide out into the recovery box 14 along the second vibrating screen 17 due to the large weight, and the first loosening roller 6 is arranged at the bottom of the second winnowing box 2, far away from one side of the first throwing roller 12, and can receive the dry tobacco shreds.

A second vibration groove 15 is arranged on the lower side of the second conveyor belt 8, a second conveyor belt is arranged on the second vibration groove 15, and the second conveyor belt conveys the dry tobacco shreds into the third winnowing box 3.

The dry tobacco shreds entering the second conveyor belt 8 comprise dry tobacco shred clusters, dry tobacco shreds and a small amount of thin stem sticks, and the dry tobacco shreds can be thinned through the second vibrating groove 15, so that caking is avoided, and the winnowing effect is better.

The second throwing roller 16 is arranged on the side wall of the middle section of the third winnowing box 3, the second throwing roller 16 throws dry tobacco shreds and thin stem sticks into the third winnowing box 3 from the second conveying belt 8, so that the winnowing effect is better, the stem sticks can directly fall to the bottom of the third winnowing box 3, and the dry tobacco shreds can be winnowed to the main conveying belt 4.

The second vibrating screen 17 is obliquely arranged at the bottom of the third winnowing box 3, a discharge port is arranged on the side wall of the third winnowing box 3, the discharge port is arranged on one side of the second vibrating screen 17, and the stem sticks are discharged from the discharge port.

The second vibrating screen 17 can stir a small part of stems, so that the dry tobacco shreds in the stems can be sent out by the third winnowing box 3, and the dry tobacco shreds can be fully sucked out by the third winnowing box 3.

The tail end of the air pipe 7 is provided with a first air lock 18, the first air lock 18 is used for recycling dry tobacco shred clusters, wet tobacco shred clusters and dry tobacco shreds, the upper side of the second conveyor belt 8 is provided with the first air lock 18, and the dry tobacco shred clusters, the wet tobacco shred clusters and the dry tobacco shreds fall on the second conveyor belt 8; the third selection by winnowing case 3 upside intercommunication has the recovery pipe, is provided with second airlock 19 on the recovery pipe, and the dry pipe tobacco is retrieved to second airlock 19, and second airlock 19 downside is provided with the recovery mouth, and main conveyer belt 4 sets up the downside at the recovery mouth.

The mixture in the air flow can be caught by the first air lock 18 and the second air lock 19 so that the mixture can smoothly enter the next stage winnowing box or the main conveyor 4. In addition, the second conveyor belt 8 can move, if two-stage air separation is needed, the main conveyor belt 4 can be arranged on the lower side of the second conveyor belt 8, the three-stage air separation device can be flexibly switched, and when the two-stage air separation device is needed, different tobacco shred production lines can be used.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The utility model provides a tertiary wind selector, its characterized in that includes first wind selector (1), second wind selector (2), third wind selector (3) and main conveyer belt (4), the mixture loops through first wind selector (1), second wind selector (2) and third wind selector (3), the mixture includes dry tobacco shred, dry tobacco shred group, wet tobacco shred group and stalk label, first wind selector (1) will be partly dry tobacco shred wind send to main conveyer belt (4), install first conveyer belt (5) between first wind selector (1) and second wind selector (2), transport on first conveyer belt (5) follow in the first wind selector (1) the mixture that drops, first conveyer belt (5) transport to in the second wind selector (2), first loose roller (6) are installed to the bottom of second wind selector (2), first loose roller (6) will be partly dry tobacco shred group and second wind selector (8) are carried in the second wind selector belt (8) and are carried dry tobacco shred group (8) to dry tobacco shred group is carried (8) and is carried in the second wind selector belt (8), a second conveyor belt (8) is arranged at the lower side of the second loosening member (9), the second conveyor belt (8) conveys the dry tobacco shreds into a third winnowing box (3), and the third winnowing box (3) sucks the dry tobacco shreds into the main conveyor belt (4);

the second loosening member (9) comprises a first carding roller (91) and a second carding roller (92), conical nails (10) are distributed on the outer wall of the first loosening roller (6) at equal intervals, the density of the conical nails (10) of the first carding roller (91) and the second carding roller (92) is greater than that of the conical nails (10) of the first loosening roller (6), the first carding roller (91) and the second carding roller (92) reversely rotate and the conical nails (10) are mutually staggered, the suction force of the second winnowing box (2) is smaller than that of wet tobacco clusters in the second winnowing box (2), and the suction force of the third winnowing box (3) is smaller than that of stems in the third winnowing box (3).

2. The tertiary air separation device according to claim 1, wherein a first vibration groove (11) is arranged at the tail end of the first conveyor belt (5), the other end of the first vibration groove (11) is communicated with the second air separation box (2), the first vibration groove (11) spreads the mixture to be thin through vibration, a first conveyor belt is arranged on the first vibration groove (11), and the first conveyor belt sends the mixture into the second air separation box (2).

3. Three-stage air separation device according to claim 1, characterized in that a first material-throwing roller (12) is mounted in the middle section of the second air separation box (2), and the first material-throwing roller (12) throws the mixture into the second air separation box (2).

4. A tertiary air separation device according to claim 3, characterized in that a first vibrating screen (13) is obliquely arranged at the bottom of the second air separation box (2), an opening is arranged on one side, close to the lower side of the first vibrating screen (13), of the side wall of the second air separation box (2), a recovery box (14) is arranged on the opening, the first vibrating screen (13) discharges the stem sticks and the wet tobacco shreds into the recovery box (14), and the first loosening roller (6) is arranged at the bottom of the second air separation box (2) at one side far away from the first throwing roller (12).

5. Three-stage air separation device according to claim 1, characterized in that a second vibration groove (15) is arranged on the lower side of the second conveyor belt (8), a second conveyor belt is arranged on the second vibration groove (15), and the second conveyor belt conveys the dry tobacco shreds into the third air separation box (3).

6. Three-stage air separation device according to claim 1, characterized in that a second material throwing roller (16) is mounted on the side wall of the middle section of the third air separation box (3), and the second material throwing roller (16) throws dry tobacco shreds from the second conveyor belt (8) into the third air separation box (3).

7. The three-stage air separation device according to claim 1, wherein a second vibrating screen (17) is obliquely arranged at the bottom of the third air separation box (3), a discharge port is arranged on the side wall of the third air separation box (3), the discharge port is arranged on the lower side of the second vibrating screen (17), and the stem sticks are discharged from the discharge port.

8. Three-stage air separation device according to claim 1, characterized in that a first air lock (18) is mounted at the end of the air duct (7), the first air lock (18) recovers the dry tobacco shreds of the dry tobacco shreds mass, the first air lock (18) is mounted on the upper side of the second conveyor belt (8), and the dry tobacco shreds mass and the dry tobacco shreds fall onto the second conveyor belt (8).

9. The three-stage winnowing device according to claim 1, wherein a recovery pipe is communicated with the upper side of the third winnowing box (3), a second airlock (19) is arranged on the recovery pipe, the second airlock (19) recovers the dry tobacco shreds, a recovery port is arranged on the lower side of the second airlock (19), and the main conveying belt (4) is arranged on the lower side of the recovery port.