CN113017136A - Threshing and air separating device - Google Patents

Abstract

The invention relates to threshing and pneumatic separating equipment which comprises a pneumatic separating bin and a threshing device for tearing tobacco leaves, wherein the threshing device is arranged in the pneumatic separating bin and comprises a vertical threshing roller arranged along the vertical direction, the vertical threshing roller is provided with at least two layers of threshing knives, and the at least one layer of threshing knives is arranged on the vertical threshing roller in an inclined mode relative to the vertical direction. According to the threshing air separation device, the threshing knife is obliquely arranged on the vertical threshing roller in the vertical direction, the obliquely arranged threshing knife is long in length and large in contact surface with tobacco leaves with stems, and therefore the tobacco stems are separated from the tobacco leaves more thoroughly.

Description

Threshing and air separating device

Technical Field

The invention relates to the technical field of tobacco processing machinery, in particular to threshing and air separating equipment.

Background

In the tobacco processing line, especially with the development of the fine cigarette processing technology, the cut tobacco raw material is often required to have low cut stem content. In the traditional treatment process, tobacco stems in leaves are generally removed before shredding, and because tobacco leaves containing stems generally have more fine stems, the tobacco leaves need to be subjected to winnowing separation after being independently threshed, so that the system is large in size and wastes resources.

In the threshing redrying line, threshing is generally carried out by four threshing and twelve threshing, the occupied area is long, particularly, the tobacco leaves are threshed, threshed and returned to the back threshing, the temperature of the tobacco leaves is low, in order to ensure the qualified leaf content in the stems, high-speed threshing is carried out by adopting a traditional horizontal threshing roller, and step-by-step winnowing is carried out by adopting a plurality of air separators, so that more equipment is needed, the energy consumption is large, and the occupied area is large.

The vertical threshing machine can be used for threshing tobacco leaves, tobacco stems and tobacco leaves with stems simultaneously and sorting the tobacco leaves, the occupied area is small, the system is small in size, however, in the traditional vertical threshing machine, seven-eight layers of threshing knives are generally arranged on a threshing roller, three threshing knives are generally horizontally arranged on each layer, and due to the arrangement, the rotating speed of the threshing roller is high during threshing, so that the noise of equipment is very large; and the wind enters from one side of the wind sub-bin, and the wind force in the wind sub-bin is uneven, so that the tobacco leaf winnowing effect is poor.

The present invention has been made in view of this situation.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the threshing and winnowing device, wherein the mixture of the tobacco leaves, the tobacco stems and the tobacco leaves with stems is subjected to threshing and winnowing at the same time, so that the threshing and winnowing effects are good.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a threshing and pneumatic separating device, includes the pneumatic separation storehouse and is used for carrying out the threshing device that tears to the tobacco leaf, threshing device sets up in the pneumatic separation storehouse, and threshing device includes the vertical roller of beating along vertical direction setting, the vertical roller of beating sets up at least two-layer threshing teeth, and at least one deck threshing teeth is inclined to vertical direction setting on the vertical roller of beating.

In the scheme, the threshing knife is obliquely arranged on the vertical threshing roller in the vertical direction, the obliquely arranged threshing knife is long in length and large in contact area with tobacco leaves with stems, and therefore the tobacco stems and the tobacco leaves are separated more thoroughly.

Further, the vertical beating roller at least comprises a first rotating drum and a second rotating drum, the side surfaces of the first rotating drum and the second rotating drum are respectively provided with at least one layer of beating knives, and the side surface of the second rotating drum is at least obliquely upwards provided with a second beating knife.

Furthermore, a third beating knife is horizontally arranged on the side face of the second rotary drum, and the second beating knife and the third beating knife are distributed in a staggered mode along the axial direction of the air separation bin.

Further, the number of the beating knives of each layer arranged on the vertical beating roller is 8-16.

In the scheme, the beating rollers are provided with three layers of beating knives, and each layer is provided with 8-16 beating knives, so that the space is saved, the number of layers of beating knives is reduced, and the noise is relatively reduced.

Furthermore, an annular first frame rail and an annular second frame rail are arranged between the vertical beating roller and the peripheral wall of the air separation bin along the vertical direction, the first frame rail is positioned above the second frame rail, the first frame rail is matched with the beating knife of the first rotary drum, and the second frame rail is matched with the beating knife of the second rotary drum.

Furthermore, the air separation bin is sequentially provided with an upper bin, a middle bin and a lower bin from top to bottom, an equal-pressure bin is arranged between the middle bin and the lower bin, the threshing air separation device comprises an air inlet system, the air inlet system is communicated with the equal-pressure bin, and the equal-pressure bin is used for equally dividing air entering the air separation bin from the air inlet system along the peripheral wall of the air separation bin.

In the above scheme, the setting of isobaric storehouse can guarantee that the wind speed in the wind branch storehouse is even stable relatively, more does benefit to the threshing wind branch.

Further, isobaric storehouse is the cavity, including roof, diapire, lateral wall and inside wall, and the roof is connected with well storehouse, and the diapire is connected with lower storehouse, evenly sets up the through-hole or the nozzle stub that make wind get into the wind branch storehouse on the inside wall.

Further, the outer side wall of the isobaric chamber is provided with an air inlet, and the air inlet system is communicated with the isobaric chamber through the air inlet, or the bottom wall of the isobaric chamber is provided with the air inlet, and the air inlet system is communicated with the isobaric chamber through the air inlet.

Further, the air sub-bin above the isobaric bin is provided with at least two cross sections with different areas, and the cross section with the large area is positioned below the cross section with the small area.

In the scheme, the cross section of the upper part of the air branch bin above the equal-pressure bin is smaller than that of the lower part of the air branch bin, so that the air speed at the high part in the air branch bin is higher than that at the low part, and the tobacco leaves in the mixture and the tobacco leaves formed after tearing are separated out more smoothly.

Further, the cross section of the air distribution bin is circular.

After the technical scheme of the invention is adopted, the following beneficial effects are brought:

according to the threshing air separation equipment provided by the invention, the threshing knife is arranged on the vertical threshing roller in an inclined manner in the vertical direction, the length of the threshing knife is long, and the contact surface with tobacco leaves with stems is large, so that the tobacco stems and the tobacco leaves are separated more thoroughly.

According to the threshing pneumatic separating device provided by the invention, the threshing roller is provided with three layers of threshing knives, each layer is provided with 8-16 threshing knives, the space is saved, the number of layers of threshing knives is reduced, and the noise is relatively reduced.

The threshing air separation equipment provided by the invention has the advantages that the equipressure cabin is arranged, the relative uniformity and stability of the air speed in the air separation cabin can be ensured, and the threshing air separation is more facilitated.

According to the threshing air separation device provided by the invention, the cross section of the upper part of the air separation bin above the isobaric bin is smaller than that of the lower part of the air separation bin, so that the air speed at the high part in the air separation bin is higher than that at the low part, and the tobacco leaves in the mixture and the tobacco leaves formed after being torn are separated more smoothly.

Drawings

FIG. 1: the embodiment of the invention provides a structural schematic diagram of threshing and air separating equipment.

FIG. 2: the embodiment of the invention provides a structural schematic diagram of threshing and air separating equipment.

FIG. 3: the embodiment of the invention provides a structural schematic diagram of an isobaric chamber of threshing and air separating equipment.

Reference numerals: 1. the air separation bin 11, the upper bin 12, the middle bin 13, the lower bin 14, the equal pressure bin 141, the outer side wall 142, the inner side wall 1421, the through hole 143, the top wall 144, the bottom wall 145, the air inlet 21, the rotating shaft 221, the first rotating roller 222, the second rotating roller 231, the first scraping knife 232, the second scraping knife 233, the third scraping knife 31, the first frame rail 32, the second frame rail 41, the fan 42, the air conveying pipeline 51, the blanking device 52, the connecting pipeline 53, the discharge cover 61, the feeding air lock 62, the material homogenizing mechanism 63, the conical throwing device 71, the observation window 72, the illuminating lamp 8, the driving speed reducer 9, the discharging air lock 9

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 2, a threshing pneumatic separating device comprises a frame, a feeding device, a threshing device and a pneumatic separating device, wherein the threshing device tears tobacco leaves, the pneumatic separating device separates materials before and after threshing, the pneumatic separating device comprises an air inlet system, a pneumatic separating bin 1, a discharging pneumatic lock 9 and a blanking device 51, and the pneumatic separating bin 1 is supported on the frame; the feeding device is positioned above the air distribution bin 1 and used for feeding the air distribution bin 1 and comprises a feeding air lock 61 and a refining mechanism 62, an air inlet system and the air distribution bin 1 are communicated with the lower end of the air distribution bin 1, air is supplied upwards to realize air distribution of tobacco, a discharging air lock 9 is arranged below the air distribution bin 1, and a material falling device 51 is communicated with the upper end of the air distribution bin 1 through a connecting pipeline 52; the threshing device comprises a vertical threshing roller and a frame fence, the vertical threshing roller is arranged in the air separation bin 1 along the vertical direction, and an annular frame fence is arranged between the vertical threshing roller and the peripheral wall of the air separation bin 1.

The threshing pneumatic separating device is mainly used for three threshing and four threshing in the tobacco threshing process, when the device works, a mixed material containing tobacco leaves, tobacco stems and leaves with stems enters the pneumatic separating bin 1 through the feeding device, and under the action of ascending air flow in the pneumatic separating bin 1, the vertical threshing roller rotates at a high speed and is matched with a frame fence to perform suspended threshing, and the leaves with stems are torn to separate the leaves and the stems; the tobacco leaves in the mixture and the tobacco leaves obtained after tearing float upwards, enter a blanking device 51 from the upper part of the air separation bin 1 through a connecting pipeline 52 and are discharged out of the equipment, the tobacco stems in the mixture, the tobacco stems obtained after tearing and the tobacco leaves with stems which still do not realize the separation of the tobacco stems sink, and the tobacco leaves are discharged out of the equipment from a discharging airlock 9.

In the embodiment of the invention, the vertical beating roller is provided with at least two layers of beating knives, and at least one layer of beating knives is arranged on the vertical beating roller in an inclined mode relative to the vertical direction.

Specifically, as shown in fig. 2, the vertical beating roller uses a rotating shaft 21 as a central shaft, and the rotating shaft 21 is arranged in the center of the air separation bin 1 along the axial direction of the air separation bin 1; the rotating shaft 21 is provided with a first rotating roller 221 and a second rotating roller 222 with different cross-sectional areas, and the central axes of the two rotating rollers are coaxial with the rotating shaft 21; the rotation shaft 21 is connected to the first and second rotating drums 221 and 222, respectively, by a connection member. The first rotary drum 221 has a smaller cross-section than the second rotary drum 222, and the first rotary drum 221 is positioned above the second rotary drum 222. The lower bottom outer edge of the first rotary drum 221 is connected to the upper bottom outer edge of the second rotary drum 222 by a slope. The first rotary drum 221 has a horizontally disposed first knife 231 on a side surface thereof, i.e., the first knife 231 is perpendicular to the rotation shaft 21. The second rotary drum 222 has two layers of broaches, wherein one layer of broaches is a second broaches 232 arranged obliquely in the vertical direction and obliquely arranged on the side of the second rotary drum 222 upward, the other layer of broaches is a third broaches 233 parallel to the first broaches 231 and horizontally arranged on the side of the second rotary drum 222, and the second broaches 232 are located above the third broaches. The beater bar extends in a direction away from the rotating drum.

The second scraping knives 232 and the third scraping knives 233 are distributed along the axial direction of the rotating shaft 21 in a staggered manner, that is, when the projections of the two layers of scraping knives are projected on the same horizontal plane, the projection of the third scraping knife 233 is positioned between the projections of the two adjacent second scraping knives 232. The two layers of threshing knives are distributed along the axial direction of the air separation bin 1 in a staggered manner, so that the tobacco leaves with different weights can be torn when falling.

The number of the beating knives on each layer is 8-16, and the beating knives are uniformly distributed on the side surface of the rotating roller.

The beating roller is provided with three layers of beating knives, each layer is provided with 8-16 beating knives, and compared with a beating roller which is provided with seven-eight layers of beating knives and three beating knives, the space is saved; the number of layers of the cutter is reduced, and the noise is correspondingly reduced. The second layer of threshing knives are obliquely and upwards arranged on the side surface of the rotary drum, and the obliquely arranged threshing knives are long in length and large in contact area with tobacco leaves with stems, so that the tobacco stems and the tobacco leaves are separated more thoroughly.

Two layers of annular frame rails are arranged between the vertical beating roller and the peripheral wall of the air separation bin 1 along the vertical direction, namely a first frame rail 31 and a second frame rail 32, the rotary roller, the beating knife and the frame rails are positioned in the middle bin 12 of the air separation bin 1, and the first frame rail 31 is positioned above the second frame rail 32. At least one layer of beating knife is arranged on the vertical beating roller corresponding to each layer of frame fence. A layer of beating knife is horizontally arranged on the vertical beating roller corresponding to the first frame rail 31, and is a first beating knife 231; the vertical beating roller corresponding to the second frame rail 32 is provided with two layers of beating knives, namely a second beating knife 232 which is positioned above and is obliquely arranged upwards and a third beating knife 233 which is positioned below and is horizontally arranged. That is, the first cutting knife 231 disposed on the first rotary drum 221 cooperates with the first frame rail 31, and the second cutting knife 232 and the third cutting knife 233 disposed on the second rotary drum 222 cooperate with the second frame rail 32 to tear the strip stem leaves, so that the leaves are separated from the stems. Specifically, a mixed material containing tobacco leaves, tobacco stems and leaves with stems enters the air separation bin 1 through a feeding device, falls onto the conical thrower 63, is thrown to the first frame rail 31 and is blocked under the action of centrifugal force, and due to the relative movement of the first cutter 231 and the first frame rail 31, the leaves with stems are torn, so that the separation of the leaves and the stems is realized; the peduncle-containing leaves and stems which are not completely torn fall down between the second frame rail 32 and the second rotary drum 222, and the peduncle-containing leaves are further torn, so that the leaf and stem separation is realized.

The frame rails are rod-type frame rails, each layer of frame rail comprises a plurality of rod bodies, and the diameters, the heights and the density of the rod bodies are adjustable so as to adapt to the threshing and air classification requirements of different batches of tobacco leaves, tobacco stems and mixed materials with stems and leaves. The cross-section of the rod body may be circular, square, triangular or polygonal, preferably circular.

The threshing pneumatic separating device is mainly used in three threshing and four threshing in the threshing process, and the number of the rotary drums, the number of layers of the threshing knives, the number of the threshing knives in each layer, the arrangement mode of the threshing knives, the diameter of the rod body of the frame fence, the height and the density degree can be adjusted according to actual specific threshing requirements. For example, only two layers of cutters are arranged, each layer of cutters is obliquely arranged, and more rod bodies are arranged; or four layers of beating knives are arranged, and the beating knives are sequentially arranged horizontally, obliquely, horizontally and obliquely, so that the number of the beating knives on each layer is reduced; or three rotary drums are arranged, a layer of beating knife is arranged on the side face of each rotary drum, and the beating knife in the middle is obliquely arranged.

In a further embodiment, the air sub-bin 1 comprises an upper bin 11, a middle bin 12 and a lower bin 13 from top to bottom in sequence, an equal pressure bin 14 is arranged between the middle bin 12 and the lower bin 13 of the air sub-bin 1, and the equal pressure bin 14 equally divides air entering the air sub-bin 1 from the air inlet system along the peripheral wall of the air sub-bin 1. The air inlet system comprises a fan 41 and an air conveying pipeline 42, and the isobaric chamber 14 is communicated with the fan 41 through the air conveying pipeline 42.

Specifically, as shown in fig. 3, the isobaric chamber 14 is a chamber surrounded by an outer side wall 141, an inner side wall 142, a top wall 143, and a bottom wall 144, wherein the top wall 143 is connected to the intermediate chamber 12, the bottom wall 144 is connected to the lower chamber 13, the inner side wall 142 is uniformly provided with through holes 1421 or short pipes for allowing air to enter the air sub-chamber 1, the outer side wall 141 is provided with an air inlet 145, and the air duct 42 of the air intake system is communicated with the air inlet 145, or the air inlet is arranged on the bottom wall, as long as it is ensured that the air supplied by the fan 41 firstly enters the isobaric chamber 14 and then uniformly enters the air sub-chamber 1 through the through holes or short pipes on the. The wind speed of the fan 41 can be adjusted according to actual needs, and is designed to be the suspension speed containing peduncle leaves.

The threshing pneumatic separation equipment is provided with the equal-pressure bin 14, the equal-pressure bin 14 evenly divides the air entering the pneumatic separation bin 1 along the peripheral wall of the pneumatic separation bin 1, the air speed in the pneumatic separation bin 1 is ensured to be relatively uniform and stable, and the threshing pneumatic separation equipment can better separate the mixture of tobacco leaves, tobacco stems and tobacco leaves with stems and can tear the tobacco leaves with stems more reasonably. If the isobaric chamber 14 is not arranged, the wind provided by the fan 41 directly enters the air branch chamber 1 from the side, so that the wind power of the area of the air branch chamber 1 opposite to the air inlet is too high, the wind power of other areas is too low, the mixture cannot be separated, and the tobacco leaves with stems cannot be torn reasonably.

The side of the upper bin 11 is provided with an observation window 71 and illuminating lamps 72, the illuminating lamps 72 are positioned outside the observation window 71, each observation window 71 is provided with one illuminating lamp 72, or only part of the observation windows 71 are provided with the illuminating lamps 72, preferably four of the observation windows 71 and the illuminating lamps 72 are positioned on four sides and are opposite to each other in pairs. The discharge hood 53 is located above the upper bin 11.

As shown in fig. 1 and 2, the air sub-silo 1 above the isobaric silo 14 has at least two cross-sections with different areas, the cross-section with the larger area being located below the cross-section with the smaller area. Specifically, the cross-sectional areas of the wind sub-silos 1 are different in size, wherein the cross-sectional area of the wind sub-silo 1 where the constant-pressure silo 14 is located is the largest, the cross-sectional area of the wind sub-silo 1 where the intermediate silo 12 is located is smaller than the cross-sectional area of the constant-pressure silo 14, and the cross-sectional area of the wind sub-silo 1 where the first rotating roller 221 is located is smaller than the cross-sectional area of the wind sub-silo 1 where the second rotating roller 222 is located; the upper bin 11 comprises two parts, wherein the cross-sectional area of the part connected with the middle bin 12 is the same as that of the wind sub-bin 1 in which the connected part of the middle bin 12 is positioned; the other part is positioned above the observation window 71 and below the discharge cover 53, and is in a truncated cone shape, and the cross section of the other part is gradually reduced from the bottom to the top.

The cross sections of the air sub-bins 1 are different in size, the cross section of the equal-pressure bin 14 is larger than that of the middle bin 12, the cross section of the lower part of the middle bin 12 is larger than that of the upper part, the cross section of the lower part of the upper bin 11 is the same as that of the upper part of the middle bin 12, and the cross section of the lower part of the upper bin 11 is larger than that of the upper part, so that the air speed at the high part in the air sub-bins 1 is higher than that at the low part, and tobacco leaves in a mixture and tobacco leaves formed after tearing are separated out; moreover, compared with the design that the cross sections of the upper bin 11, the middle bin 12 and the equal-pressure bin 14 are equal, the invention also saves materials and reduces the cost to a certain extent.

In the embodiment of the invention, the cross section of the air separation bin 1 is circular, and as the beating roller of the threshing air separation device is a vertical beating roller, the air separation bin 1 with the circular cross section is matched with the vertical beating roller, the space can be more fully utilized, and the space is saved to a certain extent.

As an alternative to the above, the wind sub-silo 1 may also be provided with a square cross-section or a sail-shaped longitudinal section.

The conical material throwing device 63 is positioned at the top end of the rotating shaft 21, the bottom edge of the conical material throwing device 63 extends downwards along the axial direction of the rotating shaft 21 and is connected with the upper bottom surface of the first rotating drum 221, the lower end of the rotating shaft 21 is connected with a driving device, and the driving device comprises a motor, a driving speed reducer 8, a narrow V-belt and the like. The rotating speed of the rotating shaft 21 is adjustable; other high speed rotation means than narrow V-belts may be used. These are prior art and will not be described further herein.

The feeding air lock 61 is positioned at the central position above the upper bin 11 of the air separation bin 1, and the mixed material of tobacco leaves, tobacco stems and tobacco leaves enters the circular air separation bin 1 through the feeding air lock 61. The discharging hood 53 is arranged right below the feeding air lock 61, the discharging hood 53 is communicated with the blanking device 51 through the connecting pipeline 52, and the qualified tobacco leaves and the threshed tobacco leaves in the mixed material are discharged into the blanking device 51 through the discharging hood 53 for material-air separation under the action of the ascending air flow in the air separation bin 1. The lower bin 13 of the air separation bin 1 comprises an inverted cone-shaped structure, the discharging air lock 9 is arranged at the lower end of the inverted cone, tobacco stems in mixed materials, the tobacco stems after being torn and stem-carrying leaves which still do not realize leaf and stem separation after being torn sink and converge to the inverted cone-shaped structure, and the tobacco stems, the tobacco stems after being torn and the stem-carrying leaves are discharged through the discharging air lock 9. These are prior art and will not be described further herein.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a threshing and pneumatic separating device, includes the pneumatic separating storehouse and is used for tearing the threshing device to the tobacco leaf, the threshing device sets up in the pneumatic separating storehouse, and the threshing device includes the vertical roller of beating along vertical direction setting, its characterized in that: the vertical beating roller is provided with at least two layers of beating knives, and the at least one layer of beating knives are arranged on the vertical beating roller in an inclined mode in the vertical direction.

2. A threshing air separation plant according to claim 1, characterised in that: the vertical beating roller at least comprises a first rotating roller and a second rotating roller, wherein the side surfaces of the first rotating roller and the second rotating roller are respectively provided with at least one layer of beating knife, and the side surface of the second rotating roller is at least obliquely and upwards provided with the second beating knife.

3. A threshing air separation plant according to claim 2, characterised in that: and the side surface of the second rotary drum is also horizontally provided with third beating knives, and the second beating knives and the third beating knives are distributed in a staggered manner along the axial direction of the air separation bin.

4. A threshing air separation plant according to claim 1, characterised in that: the number of each layer of beating knives arranged on the vertical beating roller is 8-16.

5. A threshing air separation plant according to claim 2, characterised in that: and annular first frame rails and second frame rails are arranged between the vertical beating rollers and the peripheral wall of the air separation bin along the vertical direction, the first frame rails are positioned above the second frame rails, the first frame rails are matched with beating knives of the first rotary drum, and the second frame rails are matched with beating knives of the second rotary drum.

6. A threshing and air separating apparatus according to any one of claims 1 to 5 wherein: the leaf beating air separation device comprises an air inlet system, wherein the air inlet system is communicated with the equal-pressure cabin, and the equal-pressure cabin is used for equally dividing the air entering the air separation cabin from the air inlet system along the peripheral wall of the air separation cabin.

7. A threshing air separation plant according to claim 6, characterised in that: the isobaric bin is a cavity and comprises a top wall, a bottom wall, an outer side wall and an inner side wall, the top wall is connected with the middle bin, the bottom wall is connected with the lower bin, and through holes or short pipes for enabling wind to enter the wind sub-bins are uniformly formed in the inner side wall.

8. A threshing air separation plant according to claim 7, characterised in that: the outer side wall of the isobaric bin is provided with an air inlet, and the air inlet system is communicated with the isobaric bin through the air inlet, or the bottom wall of the isobaric bin is provided with an air inlet, and the air inlet system is communicated with the isobaric bin through the air inlet.

9. A threshing air separation plant according to claim 6, characterised in that: the air sub-bin above the isobaric bin is provided with at least two cross sections with different areas, and the cross section with the large area is positioned below the cross section with the small area.

10. A threshing air separation plant according to claim 9, characterised in that: the cross section of the wind sub-bin is circular.

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