A wheat seed sorting device

Abstract

The application discloses a wheat seed sorting device, which comprises a conveying cavity, a negative pressure cavity and a negative pressure forming device. The side wall of the conveying cavity is gradually inclined to the center along the direction of gravity, so that the inner wall of the conveying cavity forms a bearing conveying surface. The side wall of the conveying cavity is provided with a hole which penetrates the inside and outside and cannot pass through the seed. The seed rolls and slides down through the bearing conveying surface, and the hole direction forms an angle of 0-60 DEG with the vertical direction. The conveying cavity is formed on the side of the negative pressure cavity, and the side wall of the negative pressure cavity is provided with a negative pressure hole which is communicated with the conveying cavity. The negative pressure forming device is arranged in the negative pressure cavity to form negative pressure in the negative pressure cavity. The application simultaneously realizes the seed surface treatment, small particle impurity removal and dust adsorption in the conveying process through the design of the shape, angle and position of the two cavities.

Description

Technical Field

[0001] This invention relates to the field of crop weed removal equipment technology, specifically to a wheat seed sorting device. Background Technology

[0002] Wheat is one of the staple foods for humans. After being ground into flour, it can be used to make bread, steamed buns, biscuits, noodles and other foods. After fermentation, it can be made into beer, alcohol, liquor or biomass fuel. The wide application of wheat determines the importance of wheat seeds. The sorting and impurity removal of wheat seeds can not only protect the production environment and ensure the health of workers, but also improve the quality of wheat-based foods and provide higher quality original seeds for wheat breeding.

[0003] In existing technologies, different cleaning equipment is used to ensure optimal impurity removal for different impurities in wheat seeds. For impurities with obvious differences in particle size, a vibrating screen can be used to separate them by utilizing the difference in the mesh size of the screen; for straw-like impurities that are lighter than wheat, wind power can be used for impurity removal, which is both efficient and convenient; for impurities such as stones, mud, and coal that are heavier than wheat, a gravity separator can be used for separation.

[0004] However, existing devices mostly use fans to separate the wheat seeds from the dust and fine floating matter, blowing the dust into the air, polluting the production workshop environment, endangering the health of workers, and the effect of removing dust adhering to the surface of the wheat seeds is not good. Summary of the Invention

[0005] The purpose of this invention is to provide a wheat seed sorting device to solve the problem that existing devices cannot simultaneously perform surface treatment, small particle removal, and dust adsorption on seeds during the transport process.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] In a first aspect of the invention, a wheat seed sorting apparatus is provided, comprising:

[0008] The conveying cavity has its sidewalls gradually inclined towards the center along the direction of gravity, so that the inner wall of the conveying cavity forms a bearing and conveying surface. The sidewalls of the conveying cavity are provided with channels that penetrate through the inside and outside but do not allow seeds to pass through. The seeds roll down the bearing and conveying surface, and the through-hole direction of the channel forms an angle of 0 to 60° with the vertical direction.

[0009] A negative pressure cavity is formed around the periphery of the negative pressure cavity, and a negative pressure hole communicating with the conveying cavity is provided on the side wall of the negative pressure cavity;

[0010] A negative pressure forming device is installed inside a negative pressure cavity to create negative pressure within the cavity.

[0011] Furthermore, a corrugated structure is provided on the bearing and conveying surface along the direction of seed rolling;

[0012] Among them, stiff bristles are distributed on the corrugated structure;

[0013] Among them, no hard bristles are provided on the periphery of the edge of the channel for at least 6 mm;

[0014] Among them, the hard bristles protrude no more than 4mm from the corrugated surface.

[0015] Furthermore, a spiral inclined plate is provided from top to bottom in the conveying cavity. One side edge of the spiral inclined plate is fixed to the outer wall of the negative pressure cavity, and a gap is provided between the other side edge and the bearing conveying surface to allow seeds to pass through. The spiral inclined plate is inclined downward from the negative pressure cavity to the bearing conveying surface.

[0016] The bearing conveyor surface and the spiral inclined plate together form a channel for the seeds to be transported downwards.

[0017] Furthermore, multiple negative pressure holes are distributed at the location where the side wall of the negative pressure chamber connects to the spiral inclined plate.

[0018] Furthermore, the spiral plate is divided into multiple segments from top to bottom, with the tail of the previous segment of the spiral plate located above the head of the next segment of the spiral plate.

[0019] Furthermore, each segment of the spiral plate can deform under the influence of gravity as the seed falls.

[0020] Furthermore, each spiral inclined plate is movably connected to the side wall of the negative pressure cavity via a connector, so that the spiral inclined plate can move in a direction perpendicular to the surface of the spiral inclined plate under the action of gravity of the falling seed.

[0021] Furthermore, the connector includes an inner channel formed on the outer wall of the negative pressure cavity and an outer column formed on the side of the spiral inclined plate. The outer column is assembled and confined within the inner channel and is rotatable. A first abutting flange is provided on the upper wing at the root of the outer column, and a second abutting flange is provided on the lower wing.

[0022] The first abutting flange abuts against the side wall of the negative pressure cavity when the surface of the spiral inclined plate is perpendicular to the outer wall of the negative pressure cavity;

[0023] The second abutting flange abuts against the outer wall of the negative pressure cavity in the initial natural state of the spiral inclined plate, and in the initial natural state, there is a gap between the first abutting flange and the side wall of the negative pressure cavity;

[0024] The size of the gap is positively correlated with the range of motion of the spiral inclined plate.

[0025] Furthermore, multiple elastic ribs are fixedly connected along the axial direction on the upstream side of the outer column in the vertical direction. The elastic ribs are connected downward to the inner wall of the inner channel around the outer periphery of the outer column in the direction of the inner side of the negative pressure cavity.

[0026] When the surface of the spiral inclined plate is perpendicular to the outer wall of the negative pressure cavity, the elastic rib is in an elongated state, and the weight of the spiral inclined plate can be maintained in its initial natural state under the action of the elastic rib's rebound force.

[0027] Furthermore, the outer column is composed of multiple column segments distributed on the sides of the spiral inclined plate;

[0028] At least one column segment is provided with a first abutting flange and a second abutting flange.

[0029] Furthermore, a bristle kit is provided at the end of each spiral inclined plate, and the bristle kit is inclined downward along the conveying direction, with the end of the bristle kit close to the surface of the lower spiral inclined plate but not in contact with it.

[0030] The bristle kit includes a base plate and multiple bristle sections formed by several bristles, which are distributed along the conveying direction.

[0031] The bristles on the brush body are angled upwards.

[0032] Among them, the length of the bristles in the bristle body increases gradually along the conveying direction.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] This invention utilizes a rolling conveying method to filter out small particulate impurities from wheat seeds through channels on the conveying surface during transport. Simultaneously, these channels on the conveying surface also provide a degree of impurity removal for impurities adhering to the surface of the wheat seeds during the rolling process. Furthermore, dust generated during the rolling process is absorbed by the central negative pressure cavity. This invention achieves seed surface treatment, small particle removal, and dust adsorption simultaneously through the design of only two cavities (inner and outer) in terms of shape, angle, and position. Attached Figure Description

[0035] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0036] Figure 1 This is a half-sectional view of a wheat seed sorting device provided by the present invention;

[0037] Figure 2 for Figure 1 Enlarged view of section I-I;

[0038] Figure 3 A half-sectional view of another embodiment provided by the present invention;

[0039] Figure 4 for Figure 3 Enlarged view of section II-II;

[0040] Figure 5 for Figure 3 Schematic diagram of the structure of a medium-helical inclined plate;

[0041] Figure 6 for Figure 5 The front view;

[0042] Figure 7 for Figure 6 The sectional view shown is along line AA.

[0043] Figure 8 This is a schematic diagram of the segmented structure of the spiral inclined plate in another embodiment of the present invention;

[0044] Figure 9 for Figure 5 Top view;

[0045] Figure 10 for Figure 7 Enlarged view of section III-III;

[0046] Figure 11 for Figure 8 Enlarged view of section IV-IV;

[0047] Figure 12 This is a schematic diagram showing the distribution of column segments in another embodiment of the present invention.

[0048] The labels in the diagram represent the following:

[0049] 10. Conveying cavity; 11. Bearing conveying surface; 12. Channel; 13. Spiral inclined plate; 14. Gap; 15. Blanket; 151. Base plate; 152. Blanket part; 20. Negative pressure cavity; 21. Negative pressure hole; 30. Negative pressure forming device; 40. Connector; 41. Inner channel; 42. Outer column; 421. First abutting flange; 422. Second abutting flange; 43. Gap; 44. Elastic rib; 42a. Column section. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, the present invention provides a wheat seed sorting device, specifically a sorting device for removing impurities during the wheat seed sorting process, especially for removing impurities before sorting.

[0052] The sorting device is characterized by:

[0053] The conveying cavity 10 has its sidewalls gradually inclined towards the center along the direction of gravity, so that the inner wall of the conveying cavity 10 forms a bearing conveying surface 11. The sidewalls of the conveying cavity 10 are provided with a channel 12 that penetrates through the inside and outside but does not allow seeds to pass through. The seeds roll down through the bearing conveying surface 11, and the through-hole direction of the channel 12 forms an angle of 0 to 60° with the vertical direction.

[0054] A negative pressure cavity 20, wherein the conveying cavity 10 is formed on the periphery of the negative pressure cavity 20, and a negative pressure hole 21 communicating with the conveying cavity 10 is provided on the side wall of the negative pressure cavity 20;

[0055] A negative pressure forming device 30 is disposed inside the negative pressure cavity 20 to form negative pressure within the negative pressure cavity 20.

[0056] This embodiment aims to use a rolling conveying method so that wheat seeds can be filtered out of small particulate impurities through the holes 12 on the bearing conveying surface 11 during the conveying process. At the same time, the holes 12 formed on the bearing conveying surface 11 can play a small role in removing impurities attached to the surface of wheat seeds during the rolling process. Dust is easily generated during the rolling process, and it is absorbed by the negative pressure cavity 20 in the center.

[0057] It achieves the functions of seed surface treatment, small particle removal and dust adsorption during the transportation process by using only two cavities, inner and outer, in terms of shape, angle and position.

[0058] The sidewall of the conveying cavity 10 is preferably inclined at an angle of 45 to 60 degrees toward the center, and the through-hole direction of the channel 12 is preferably at an angle of 30 degrees with the vertical direction.

[0059] The negative pressure chamber 20 can be used to create a negative pressure space through the negative pressure forming device 30. No specific requirements are made for it. The negative pressure forming device 30 can be connected to external equipment or can directly transport the dust to the outside under negative pressure.

[0060] like Figure 2 As shown, in a preferred embodiment of the conveying cavity 10, a corrugated structure is provided on the bearing conveying surface 11 along the seed rolling direction, and the corrugated structure can slow down the conveying process.

[0061] As a further preferred embodiment, the corrugated structure is provided with hard bristles, which can both slow down the conveying process and enhance the treatment effect of impurities on the seed surface.

[0062] To avoid the hard bristles affecting the particle filtration effect of the channel 12, the hard bristles are not provided at least 6 mm around the edge of the channel 12.

[0063] Furthermore, the hard bristles should not protrude more than 4mm from the surface of the corrugated structure, so that if the hard bristles are too long, the seeds will get stuck in them and ultimately not be able to be completely transported out.

[0064] like Figures 3-5 As shown, in order to further improve the removal effect of small particle impurities, surface impurities and dust in wheat seeds, a spiral inclined plate 13 is arranged from top to bottom in the conveying cavity 10. One side edge of the spiral inclined plate 13 is fixed to the outer wall of the negative pressure cavity 20, and a gap 14 is provided between the other side edge and the bearing conveying surface 11 to allow seeds to pass through. The spiral inclined plate 13 is inclined downward from the negative pressure cavity 20 to the bearing conveying surface 11.

[0065] The bearing conveying surface 11 and the spiral inclined plate 13 together form a channel for the downward transport of seeds. Seeds are fed onto the bearing conveying surface 11 one by one from the top, and roll diagonally downward along the bearing conveying surface 11 and into the gap 14. Some seeds continue to roll downward along the side wall of the conveying cavity 10 through the gap 14, while some seeds can be transported along the bearing conveying surface 11 to the bearing conveying surface 11 of the next spiral inclined plate 13. This allows different forms of rolling processes to be realized in the same space. The formation of the gap 14 also slows down the transport process on the side wall of the conveying cavity 10, which can greatly improve the removal effect of particle removal, removal of doped powder (dust) and removal of surface attachments at the same time.

[0066] In practice, the movement of wheat seeds in the conveying cavity 10 can be determined by controlling the feeding rate of wheat seeds. When the feeding rate per unit time is slow, the throughput of the gap 14 is not saturated, which allows the seeds to pass through the gap 14 as much as possible. When the feeding rate is increased, if the gap 14 cannot keep up with the continuous passage of the seeds, the seeds will roll along the bearing conveying surface 11 and be conveyed to the next bearing conveying surface 11.

[0067] Preferably, the gap 14 is saturated but not overly saturated, allowing a small portion or at least 1-2 seeds of the flat-laid cotton to be conveyed downward through the bearing conveyor surface 11. At this time, the feeding rate can maintain a high conveying efficiency, i.e., sorting and impurity removal efficiency, and at the same time, it can also have a high impurity removal effect.

[0068] In a preferred embodiment, the negative pressure holes 21 are located at the position where the side wall of the negative pressure cavity 20 connects to the spiral inclined plate 13, and multiple holes are distributed to reduce the impact on seed falling.

[0069] The above methods mainly achieve the purpose of removing impurities through the conveying process. However, the conveying process is relatively gentle, and the treatment effect on impurities and dust on the seed surface needs to be improved. Based on the above, in order to further improve the treatment effect to a greater extent, the following preferred embodiment is provided:

[0070] like Figure 8 As shown, the spiral inclined plate 13 is divided into multiple segments from top to bottom, with the tail of the spiral inclined plate 13 of the previous segment located above the head of the spiral inclined plate 13 of the next segment.

[0071] Furthermore, each of the spiral inclined plates 13 can deform under the influence of gravity as the seed falls.

[0072] The arrangement of the multi-segment spiral inclined plate 13 allows the seeds to vibrate under the action of gravity, which helps to float dust and allows the seeds to generate greater friction with the side wall of the conveying cavity 10 in each segment, thus better removing surface impurities.

[0073] The deformation of the spiral inclined plate 13 is mainly achieved by fixing one side of it and leaving the other side suspended. Secondly, it is achieved by setting its thickness and / or material, which can satisfy the requirement of a small deformation.

[0074] However, if the width of the conveying cavity 10 is small, and thus the width of the spiral inclined plate 13 is also small, the deformation is not easy to control, and the vibration effect is poor. Therefore, in addition, the following are further preferred embodiments:

[0075] like Figures 5-7 , Figure 9 As shown, each section of the spiral inclined plate 13 is movably connected to the side wall of the negative pressure cavity 20 by a connector 40, so that the spiral inclined plate 13 can move in a direction perpendicular to the surface of the spiral inclined plate 13 under the action of gravity of the falling seed.

[0076] In this embodiment, by changing the connection method between the spiral inclined plate 13 and the negative pressure cavity 20, and by setting the connector 40, it can generate up-and-down fluctuations within a certain range along the connection position. Under the action of gravity when the seed falls, the spiral inclined plate 13 will generate a reaction force.

[0077] Specifically, a preferred embodiment of the connector 40 is provided:

[0078] The connector 40 includes an inner channel 41 formed on the outer side wall of the negative pressure cavity 20, and an outer column 42 formed on the side of the spiral inclined plate 13. The outer column 42 is fitted and confined within the inner channel 41 and is rotatable. A first abutting flange 421 is provided on the upper wing at the root of the outer column 42, and a second abutting flange 422 is provided on the lower wing.

[0079] The first abutting flange 421 abuts against the side wall of the negative pressure cavity 20 when the plate surface of the spiral inclined plate 13 is perpendicular to the outer side wall of the negative pressure cavity 20;

[0080] The second abutting flange 422 abuts against the outer wall of the negative pressure cavity 20 in the initial natural state of the spiral inclined plate 13, and in the initial natural state, there is a gap 43 between the first abutting flange 421 and the side wall of the negative pressure cavity 20.

[0081] The size of the gap 43 is positively correlated with the range of motion of the spiral inclined plate 13.

[0082] The spiral inclined plate 13 only needs to vibrate within a small range, therefore, the gap 43 is generally set to be small.

[0083] In this embodiment, the spiral inclined plate 13 should be kept in an inclined state toward the conveying cavity 10, and the gap 14 between the spiral inclined plate 13 and the conveying cavity 10 should not be too large. Therefore, under these two conditions, the actual width of the spiral inclined plate 13 will generally be larger than the horizontal width of the conveying cavity 10. Therefore, the first abutting flange 421 is provided to prevent the spiral inclined plate 13 from getting stuck with the conveying surface 11 when it shakes, and to keep it in a state of at least downward inclination. Therefore, the first abutting flange 421 is provided to achieve these two purposes.

[0084] In practice, after the first abutting flange 421 abuts against the side wall of the negative pressure cavity 20, the spiral inclined plate 13 preferably still maintains a certain downward tilt.

[0085] The initial natural state of the spiral ramp 13 refers to the position and tilt angle maintained under natural gravity. At this time, the falling of the seed will cause the spiral ramp 13 to shake.

[0086] When the side wall of the conveying cavity 10 has hard bristles, the gap 14 refers to the gap 14 between the hard bristle head and the bristle head, so as to ensure that the gap 14 can normally allow the seeds to pass through.

[0087] The purpose of the second abutting flange 422 is to maintain the initial state of the spiral inclined plate 13 and reduce the repeated squeezing action between the outer column 42 and the inner channel 41 during the shaking process, especially the edge of the opening of the inner channel 41, so as to avoid wear due to long-term interaction and to prevent the two from being stuck together during the shaking process.

[0088] The first abutting flange 421 and the second abutting flange 422 are convex arc surface structures extending from the spiral inclined plate 13 to the side wall of the negative pressure cavity 20. The limiting purpose is achieved by abutting the outer convex arc surface with the side wall of the negative pressure cavity 20.

[0089] The above mainly relies on the gravity of the seeds, which places certain requirements on the overall weight and connection method of the spiral inclined plate 13. The specific shaking effect still needs to be improved. The following provides a preferred embodiment:

[0090] Multiple elastic ribs 44 are fixedly connected along the axial direction on the upstream side of the vertical direction of the outer column 42. The elastic ribs 44 are connected downward to the inner wall of the inner channel 41 around the outer periphery of the outer column 42 in the direction of the inner side of the negative pressure cavity 20.

[0091] The elastic rib 44 is in an elongated state when the surface of the spiral inclined plate 13 is perpendicular to the outer wall of the negative pressure cavity 20, and the weight of the spiral inclined plate 13 can be maintained in the initial natural state under the action of the elastic rib 44.

[0092] The main function of the elastic rib 44 is to keep the spiral inclined plate 13 taut in the initial state. However, the weight of the spiral inclined plate 13 is greater than the overall tension of the elastic rib 44. Under the action of the seed gravity, since the elastic rib 44 has effectively unloaded part of the weight of the spiral inclined plate 13, the spiral inclined plate 13 can more easily vibrate.

[0093] In addition, when the spiral inclined plate 13 vibrates, the elastic rib 44 makes the vibration more obvious.

[0094] Even when the spiral inclined plate 13 is at the upper boundary position, the elastic rib 44 is in a taut state. In other words, throughout the entire movement of the spiral inclined plate 13, the elastic rib 44 always provides elastic force, making its shaking effect more obvious and gentle.

[0095] The negative pressure cavity 20 and the conveying cavity 10 are preferably configured as hollow inverted frustum cone structures. Since each spiral inclined plate 13 is spirally arranged downward along the outer surface of the negative pressure cavity 20, and its connection with the negative pressure cavity 20 is formed by bending on the negative pressure cavity 20, slight vibration of the spiral inclined plate 13 can be achieved, but it will be limited by the connection method between the two. Therefore, in order to reduce this limitation, the following is a specific embodiment of the outer column 42:

[0096] like Figure 12 As shown, the outer column 42 is composed of multiple column segments 42a distributed on the side of the spiral inclined plate 13;

[0097] At least one of the column segments 42a is provided with the first abutting flange 421 and the second abutting flange 422.

[0098] When the column segment 42a is small, its curvature is small, and the resistance during rotation is relatively small.

[0099] Furthermore, the column segment 42a can also be a sphere or any other arc or irregular shape structure that is more conducive to rotation.

[0100] like Figure 8 , Figure 11 As shown, in another preferred embodiment, a hair kit 15 is provided at the end of each section of the spiral inclined plate 13, and the hair kit 15 is inclined downward along the conveying direction, with the end of the hair kit 15 close to the surface of the lower spiral inclined plate 13 but not in contact with it.

[0101] The hair kit 15 can remove impurities from the surface during the seed's descent, and also reduce the direct fall of seeds from behind the head of the lower spiral plate 13.

[0102] However, since the lower spiral ramp 13 needs to vibrate under the gravity of the seed, the end of the wool kit 15 needs to be a certain distance from the head of the lower spiral ramp 13. In addition, the tilting setting of the wool kit 15 can also make it possible to achieve the original function with a shorter spiral ramp 13 in actual setup.

[0103] In the original case, the tail of the upper spiral inclined plate 13 and the head of the lower spiral inclined plate 13 are generally in the same vertical direction. However, by adding the inclined hair kit 15, the head length of the spiral inclined plate 13 can be reduced.

[0104] However, since the gravity of the seeds is weakened after the use of the wool kit 15, this embodiment is mainly combined with the overall embodiment of the connector 40 with elastic ribs 44.

[0105] The bristle kit 15 includes a base plate 151 and a plurality of bristle body parts 152 formed by several bristles distributed along the conveying direction; the bristles of the bristle body parts 152 are inclined upward; the bristle length of the bristles of the bristle body parts 152 increases gradually along the conveying direction.

[0106] These settings can all enhance the removal of impurities from the seed surface; choose according to the actual situation.

[0107] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A wheat seed sorting device, characterized in that, have: The conveying cavity (10) has its sidewalls gradually inclined towards the center along the direction of gravity, so that the inner wall of the conveying cavity (10) forms a bearing conveying surface (11), and the sidewall of the conveying cavity (10) is provided with a channel (12) that penetrates through the inside and outside and does not allow seeds to pass through. The seeds roll down through the bearing conveying surface (11), and the through-hole direction of the channel (12) forms an angle of 0 to 60° with the vertical direction; A negative pressure cavity (20) is provided, and the conveying cavity (10) is formed on the periphery of the negative pressure cavity (20), and a negative pressure hole (21) communicating with the conveying cavity (10) is provided on the side wall of the negative pressure cavity (20). A negative pressure forming device (30) is disposed inside the negative pressure cavity (20) for forming negative pressure inside the negative pressure cavity (20); In the conveying cavity (10), a spiral inclined plate (13) is arranged from top to bottom. One side edge of the spiral inclined plate (13) is fixed to the outer wall of the negative pressure cavity (20), and a gap (14) is provided between the other side edge and the bearing conveying surface (11) to allow seeds to pass through. The spiral inclined plate (13) is inclined downward from the negative pressure cavity (20) to the bearing conveying surface (11). The bearing conveying surface (11) and the spiral inclined plate (13) together form a channel for the downward conveying of seeds; Each of the spiral inclined plates (13) is movably connected to the side wall of the negative pressure cavity (20) by a connector (40), so that the spiral inclined plates (13) can move in a direction perpendicular to the surface of the spiral inclined plates (13) under the action of gravity of the falling seeds. The connector (40) includes an inner channel (41) formed on the outer side wall of the negative pressure cavity (20) and an outer column (42) formed on the side of the spiral inclined plate (13). The outer column (42) is fitted and confined within the inner channel (41) and is rotatable. A first abutting flange (421) is provided on the upper wing at the root of the outer column (42), and a second abutting flange (422) is provided on the lower wing. The first abutting flange (421) abuts against the side wall of the negative pressure cavity (20) when the plate surface of the spiral inclined plate (13) is perpendicular to the outer side wall of the negative pressure cavity (20); The second abutting flange (422) abuts against the outer wall of the negative pressure cavity (20) in the initial natural state of the spiral inclined plate (13), and in the initial natural state, there is a gap (43) between the first abutting flange (421) and the side wall of the negative pressure cavity (20). The size of the gap (43) is positively correlated with the range of motion of the spiral inclined plate (13).

2. The wheat seed sorting device according to claim 1, characterized in that, The bearing and conveying surface (11) is provided with a corrugated structure along the seed rolling direction; The corrugated structure is provided with stiff bristles. Wherein, the hard bristles are not provided at least 6 mm around the edge of the channel (12); The hard bristles protrude no more than 4 mm from the surface of the corrugated structure.

3. A wheat seed sorting device according to claim 1 or 2, characterized in that, Multiple negative pressure holes (21) are provided at the position where the side wall of the negative pressure cavity (20) connects to the spiral inclined plate (13).

4. The wheat seed sorting device according to claim 3, characterized in that, The spiral inclined plate (13) is divided into multiple segments from top to bottom, with the tail of the upper segment of the spiral inclined plate (13) located above the head of the lower segment of the spiral inclined plate (13). Furthermore, each of the spiral inclined plates (13) can deform under the gravity of the falling seed.

5. A wheat seed sorting device according to claim 4, characterized in that, Multiple elastic ribs (44) are fixedly connected along the axial direction on the upstream side of the vertical direction of the outer column (42). The elastic ribs (44) are connected downward to the inner wall of the inner channel (41) around the outer periphery of the outer column (42) in the direction of the inner side of the negative pressure cavity (20). The elastic rib (44) is in an elongated state when the surface of the spiral inclined plate (13) is perpendicular to the outer wall of the negative pressure cavity (20), and the spiral inclined plate (13) can be maintained in the initial natural state under the action of the elastic rib (44).

6. A wheat seed sorting device according to claim 5, characterized in that, The outer column (42) is composed of multiple column segments (42a) distributed on the side of the spiral inclined plate (13); At least one of the column segments (42a) is provided with the first abutting flange (421) and the second abutting flange (422).

7. A wheat seed sorting device according to claim 5, characterized in that, A hair kit (15) is provided at the end of each spiral inclined plate (13), and the hair kit (15) is inclined downward along the conveying direction. The end of the hair kit (15) is close to the surface of the lower spiral inclined plate (13) but does not contact it. The bristle kit (15) includes a base plate (151) and a plurality of bristle body parts (152) formed by several bristles distributed along the conveying direction. The bristles of the bristle body (152) are arranged at an upward angle; The bristle length of the bristle body (152) increases gradually along the conveying direction.

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