Grain conveyor with impurity winnowing function

Abstract

The invention relates to the technical field of grain conveying, and discloses a grain conveyor with an impurity winnowing function, the grain conveyor comprises a fixed seat, two supporting plates are symmetrically and fixedly mounted at the top of the fixed seat, and a conveying cylinder is jointly and fixedly mounted at the tops of the two supporting plates; a conveying assembly used for conveying grain is arranged in the conveying cylinder, a filtering assembly used for filtering and beating lumped grain is arranged in the conveying cylinder, a driving assembly used for driving the filtering assembly to operate is further arranged at the top of the fixing base, and the conveying assembly is in transmission connection with the driving assembly. According to the grain impurity removal device, the fixed frame and the driven filter screen are driven to slide together through the missing gear and the arc-shaped rack, so that grains caked due to damp in the conveying cylinder are dried and scattered, impurities in the grains can be exposed, the situation that the impurities are not completely removed due to grain caking is avoided, and the removal rate of the impurities in the grains is increased.

Description

Technical Field

[0001] The present application relates to the technical field of grain transportation, and in particular to a grain conveyor with an impurity air separation function. Background Art

[0002] Grain plays a vital role in modern agricultural production, especially in the process of grain harvesting, transportation and storage. Ensuring the purity of grain and improving its quality is an important task in agricultural production. Grain, as a natural product, is often mixed with various impurities after harvesting, such as soil, straw, pests, stones and other foreign matter. These impurities not only affect the quality of grain, but may also have adverse effects in subsequent processing, storage and food production. In order to improve the quality of grain and reduce the harm caused by impurities, grain conveyors often need to be equipped with impurity air separation functions to effectively separate impurities during the transportation process.

[0003] Humidity is a factor that cannot be ignored during the storage and transportation of grain. Different grain varieties have different sensitivities to humidity. When the ambient humidity is high, some grains may clump due to moisture absorption. Agglomerated grains usually lose their original granular structure and appear lumpy or sticky. This agglomeration phenomenon will seriously affect the fluidity and transportation effect of the grain, and may also have a significant impact on the impurity air separation process. When grain and impurities are stuck together, the force of the airflow will not be able to effectively separate these sticky substances. Agglomerated grains may damage equipment, and impurities may be wrapped by the grain itself, resulting in the air separation system being unable to accurately sort the agglomerated grains, and it is difficult to completely remove impurities, which will not only reduce the air separation efficiency, but also cause the impurities to be unable to be completely separated. Summary of the invention

[0004] The present application proposes a grain conveyor with impurity air separation function, which has the advantage of being able to dry and break up grain that has agglomerated due to moisture during grain transportation so that impurities in the grain are completely exposed, and is used to solve the problem of incomplete impurity removal and low sorting efficiency caused by grain moisture and agglomeration during grain transportation.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a grain conveyor with impurity air separation function, comprising a fixed seat, two support plates are symmetrically fixedly installed on the top of the fixed seat, a conveying cylinder is fixedly installed on the top of the two support plates, a conveying assembly for conveying grain is arranged inside the conveying cylinder, a filtering assembly for filtering and breaking up agglomerated grain is arranged inside the conveying cylinder, a driving assembly for driving the filtering assembly to operate is also arranged on the top of the fixed seat, and the conveying assembly is transmission-connected with the driving assembly, and a wind separation assembly for air separation of impurities in grain is also arranged on one side of the conveying assembly;

[0006] The filter assembly includes a main filter fixedly mounted on the inner wall of the conveying cylinder, a pressure sensor is arranged inside the main filter, a secondary filter is also slidably mounted on the inner wall of the conveying cylinder, the secondary filter is placed on the side of the main filter close to the air selection assembly, and the main filter and the secondary filter are in contact with each other, a heating wire is arranged inside the secondary filter, a fixing frame is fixedly connected to the outside of the secondary filter, and a first magnetic block is fixedly mounted inside the fixing frame.

[0007] Furthermore, the driving assembly includes a vertical plate fixedly mounted on the top of the fixed seat, and the vertical plate is placed between two support plates, and a rotating shaft is rotatably mounted on the support plate and the vertical plate, the conveying assembly is transmission-connected to the rotating shaft, a missing gear is fixedly mounted on the outer side of the rotating shaft, an arc-shaped rack that meshes with or separates from the missing gear is rotatably mounted on the outer wall of the conveying cylinder, and a second magnetic block that is magnetically attracted to the first magnetic block is fixedly mounted inside the arc-shaped rack.

[0008] Furthermore, a connecting rod is fixedly installed on one side of the arc-shaped rack close to the vertical plate, and a reset groove is provided on one side of the vertical plate close to the arc-shaped rack, which is connected to the connecting rod in a limited sliding manner. A spring is fixedly installed on the inner wall of the reset groove, and one end of the spring close to the rotating shaft is fixedly connected to the connecting rod.

[0009] Furthermore, the conveying assembly includes a conveying shaft rotatably installed inside the conveying cylinder, the conveying shaft movably passes through the main filter and the secondary filter, two spiral blades are fixedly installed on the outer side of the conveying shaft, and the main filter and the secondary filter are placed between the two spiral blades, a support plate is fixedly installed on the outer side of one end of the conveying cylinder away from the secondary filter, a motor is fixedly installed on the side wall of the support plate, and the end of the conveying shaft close to the motor movably passes through the side wall of the fixed seat and is fixedly connected to the output end of the motor.

[0010] Furthermore, one end of the conveying cylinder close to the motor is fixedly connected to a feed channel, and one end of the conveying cylinder away from the motor is fixedly connected to a discharge channel, and an interception net is fixedly installed at the bottom of the discharge channel.

[0011] Furthermore, the air selection component includes a connecting plate fixedly installed on the outside of one of the support plates away from the motor, a connecting shaft is rotatably installed on the side of the connecting plate close to the conveying cylinder, a worm gear is fixedly installed on the outside of the connecting shaft, the conveying shaft is transmission-connected to the rotating shaft, a worm gear meshing with the worm gear is fixedly installed on the outside of one end of the rotating shaft close to the connecting plate, and a fan blade is fixedly installed on one end of the connecting shaft close to the conveying cylinder.

[0012] Furthermore, a limiting sliding groove is provided on the outer side of the fixing frame, and a limiting sliding rod which is limitedly slidably connected to the limiting sliding groove is fixedly installed on the inner side wall of the conveying cylinder.

[0013] Furthermore, a stabilizing slide groove is provided on one side of the arc-shaped rack close to the conveying cylinder, and a stabilizing slide rod which is limitedly and slidably connected to the stabilizing slide groove is fixedly installed on the outer side wall of the conveying cylinder.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present application provides a grain conveyor with impurity air separation function, which drives the fixed frame and the slave filter to slide together through the missing gear and the arc-shaped rack, and then dries and breaks up the grain that is intercepted by the main filter and the slave filter due to moisture and agglomeration inside the conveying cylinder. It can effectively break the adhesion between grain particles, so that impurities in the grain can be exposed and separated from the grain, thereby avoiding the situation where impurity removal is incomplete due to grain agglomeration, making the grain processing process more efficient, and can better meet the quality control requirements, ensure the smooth progress of subsequent processing and storage links, and can also significantly improve the purity and quality of the grain, reduce the food safety risks that may be caused by residual impurities, and achieve the effect of improving air separation efficiency and impurity removal rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work:

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 A schematic diagram of a three-dimensional structure from another viewing angle of the present invention;

[0019] Figure 3 It is a schematic diagram of the main cross-sectional structure of the feed channel, the conveying cylinder and the discharge channel of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the main filter screen, the secondary filter screen and the fixing frame of the present invention;

[0021] Figure 5 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0022] Figure 6 It is a schematic diagram of the structure of the driving assembly of the present invention.

[0023] In the figure: 1. fixed seat; 11. support plate; 2. conveying cylinder; 3. conveying assembly; 31. conveying shaft; 32. spiral blade; 33. support plate; 34. motor; 35. feed channel; 36. discharge channel; 37. interception net; 4. filter assembly; 41. main filter; 42. secondary filter; 43. fixed frame; 44. limit slide; 45. limit slide; 5. drive assembly; 51. vertical plate; 52. rotating shaft; 53. missing gear; 54. arc rack; 55. connecting rod; 56. reset slide; 57. spring; 58. stabilizing slide; 59. stabilizing slide; 6. air selection assembly; 61. connecting plate; 62. worm gear; 63. worm; 64. fan blade. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figures 1 to 6 A grain conveyor with impurity air separation function comprises a fixed seat 1, two support plates 11 are symmetrically fixedly installed on the top of the fixed seat 1, a conveying cylinder 2 is fixedly installed on the top of the two support plates 11, a conveying assembly 3 for conveying grain is arranged inside the conveying cylinder 2, a filtering assembly 4 for filtering and breaking up agglomerated grain is arranged inside the conveying cylinder 2, a driving assembly 5 for driving the filtering assembly 4 to operate is also arranged on the top of the fixed seat 1, and the conveying assembly 3 is transmission-connected with the driving assembly 5, and a wind separation assembly 6 for air separation of impurities in the grain is also arranged on one side of the conveying assembly 3; in the process of conveying grain by the conveying assembly 3, the driving assembly 5 drives the filtering assembly 4 to break up the grain agglomerated due to moisture, and then the wind separation assembly 6 air separates the impurities in the broken grain to remove the impurities in the grain.

[0026] See also Figures 3 to 5The filter assembly 4 includes a main filter screen 41 fixedly mounted on the inner wall of the conveying cylinder 2, a pressure sensor is arranged inside the main filter screen 41, a secondary filter screen 42 is slidably mounted on the inner side wall of the conveying cylinder 2, the secondary filter screen 42 is placed on the side of the main filter screen 41 close to the air selection assembly 6, and the main filter screen 41 is in contact with the secondary filter screen 42, an electric heating wire is arranged inside the secondary filter screen 42, a fixed frame 43 is fixedly connected to the outer side of the secondary filter screen 42, a first magnetic block is fixedly mounted inside the fixed frame 43, a limited sliding groove 44 is arranged on the outer side of the fixed frame 43, a limiting sliding rod 45 which is limitedly slidably connected to the limiting sliding groove 44 is fixedly mounted on the inner side wall of the conveying cylinder 2, under the action of the driving assembly 5, the fixed frame 43 can drive the secondary filter screen 42 to slide back and forth on the inner side wall of the conveying cylinder 2, when there is no agglomeration in the grain, the dispersed grain can smoothly pass through the main filter screen 41 and the secondary filter screen 42, and It will not be intercepted by the main filter 41. If there are lumps in the grain, it will be intercepted by the main filter 41. The pressure sensor inside the main filter 41 converts the physical pressure into an electrical signal, which is then transmitted to the controller. The controller converts it into a control signal and sends it to the actuator, which then turns on the heating wire inside the slave filter 42. The heating wire inside the slave filter 42 generates heat to dry the agglomerated grain. At the same time, when a part of the agglomerated grain passes through the main filter 41, it will be immediately broken up by the slave filter 42 that is in contact with the main filter 41 and reciprocates, until the agglomerated grain is completely broken up. The pressure sensor inside the main filter 41 returns to a normal pressure value, and the impurities in the grain are exposed by heating and breaking up the agglomerated grain by the slave filter 42, thereby avoiding the incomplete removal of impurities due to grain agglomeration, thereby improving the impurity removal rate in the grain.

[0027] See also Figure 1 and Figure 6The driving assembly 5 includes a vertical plate 51 fixedly mounted on the top of the fixing seat 1, and the vertical plate 51 is placed between the two supporting plates 11, and a rotating shaft 52 is installed on the supporting plate 11 and the vertical plate 51 to rotate together, and the conveying assembly 3 is connected to the rotating shaft 52 in a transmission manner, and a missing gear 53 is fixedly installed on the outer side of the rotating shaft 52, and an arc-shaped rack 54 that meshes or separates with the missing gear 53 is rotatably installed on the outer wall of the conveying cylinder 2, and a second magnetic block that is magnetically attracted to the first magnetic block is fixedly installed inside the arc-shaped rack 54, and the arc-shaped rack 54 is close to the conveying A stabilizing groove 58 is provided on one side of the cylinder 2, a stabilizing slide bar 59 is fixedly installed on the outer wall of the conveying cylinder 2 and is limitedly slidably connected to the stabilizing groove 58, a connecting rod 55 is fixedly installed on the side of the arc-shaped rack 54 close to the vertical plate 51, and a reset groove 56 is provided on the side of the vertical plate 51 close to the arc-shaped rack 54 and is limitedly slidably connected to the connecting rod 55, a spring 57 is fixedly installed on the inner wall of the reset groove 56, and one end of the spring 57 close to the rotating shaft 52 is fixedly connected to the connecting rod 55, and under the action of the conveying component 3, the rotating shaft 52 rotates to drive the missing gear 53 to rotate. When the missing gear 53 rotates, the meshing transmission between it and the arc-shaped rack 54 drives the arc-shaped rack 54 to rotate on the outside of the conveying cylinder 2. At the same time, relative sliding occurs between the stabilizing groove 58 and the stabilizing slide bar 59. The stabilizing groove 58 and the stabilizing slide bar 59 prevent the arc-shaped rack 54 from deviating when sliding on the outside of the conveying cylinder 2. Since the second magnetic block inside the arc-shaped rack 54 is magnetically attracted to the first magnetic block inside the fixed frame 43, the arc-shaped rack 54 slides. It drives the filter screen 42 and the fixed frame 43 to slide synchronously. When the arc-shaped rack 54 slides downward, the arc-shaped rack 54 drives the connecting rod 55 to compress the spring 57 inside the reset slide groove 56. Therefore, when the missing gear 53 is separated from the arc-shaped rack 54, under the action of the elastic force of the spring 57, the connecting rod 55 drives the arc-shaped rack 54 to reset, thereby making the arc-shaped rack 54 slide back and forth on the outside of the conveying cylinder 2, and finally making the filter screen 42 and the fixed frame 43 slide back and forth to break up the agglomerated grains inside the conveying cylinder 2.

[0028] See also Figure 3The conveying assembly 3 includes a conveying shaft 31 rotatably mounted inside the conveying cylinder 2, an end of the conveying cylinder 2 close to the motor 34 is fixedly connected to a feed channel 35, an end of the conveying cylinder 2 away from the motor 34 is fixedly connected to a discharge channel 36, an interception net 37 is fixedly mounted at the bottom of the discharge channel 36, the conveying shaft 31 movably penetrates the main filter screen 41 and the secondary filter screen 42, two spiral blades 32 are fixedly mounted on the outer side of the conveying shaft 31, and the main filter screen 41 and the secondary filter screen 42 are placed between the two spiral blades 32, a support plate 33 is fixedly mounted on the outer side of the end of the conveying cylinder 2 away from the secondary filter screen 42, a motor 34 is fixedly mounted on the side wall of the support plate 33, and an end of the conveying shaft 31 close to the motor 34 movably penetrates the fixed The side wall of the fixed seat 1 is fixedly connected to the output end of the motor 34. When conveying grain, the grain enters the conveying cylinder 2 through the feed channel 35, and the conveying shaft 31 and the spiral blade 32 are driven to rotate through the output end of the motor 34, and then the grain is conveyed to the discharge channel 36. The grain conveyed by the spiral blade 32 will pass through the main filter 41 and the secondary filter 42, and because the conveying shaft 31 moves through the main filter 41 and the secondary filter 42, its rotation will not affect the operation of the main filter 41 and the secondary filter 42, and the air separation component 6 will then air separate the grain falling through the discharge channel 36. During air separation, the interception net 37 intercepts the grain in the interception net 37, and impurities will fly out through the mesh holes on the interception net 37.

[0029] See also Figure 2 The air separation component 6 includes a connecting plate 61 fixedly installed on the outside of one of the support plates 11 away from the motor 34, a connecting shaft is rotatably installed on the side of the connecting plate 61 close to the conveying cylinder 2, a worm gear 62 is fixedly installed on the outside of the connecting shaft, the conveying shaft 31 is transmission-connected with the rotating shaft 52, a worm 63 meshing with the worm gear 62 is fixedly installed on the outside of one end of the rotating shaft 52 close to the connecting plate 61, and a fan blade 64 is fixedly installed on the end of the connecting shaft close to the conveying cylinder 2. When the conveying shaft 31 rotates, the conveying shaft 31 drives the rotating shaft 52 and the worm 63 to rotate through the transmission connection, and the worm 63 drives the worm wheel 62 to rotate through the meshing transmission, so that the connecting shaft and the fan blade 64 rotate together. When the fan blade 64 rotates, the impurities in the grain falling through the intercepting net 37 are air-separated and the impurities in the grain are blown out.

[0030] Working principle:

[0031] 1. When conveying grain, the grain enters the conveying cylinder 2 through the feeding channel 35, and the conveying shaft 31 and the spiral blade 32 are driven to rotate by the output end of the motor 34, and then the grain is conveyed to the direction of the discharging channel 36. The grain conveyed by the spiral blade 32 will pass through the main filter 41 and the secondary filter 42. Since the conveying shaft 31 movably penetrates the main filter 41 and the secondary filter 42, its rotation will not affect the operation of the main filter 41 and the secondary filter 42. At the same time, the rotating conveying shaft 31 drives the rotating shaft 52 and the worm 63 to rotate through the transmission connection, and the worm 63 drives the worm wheel 62 to rotate through the meshing transmission, so that the connecting shaft and the fan blade 64 rotate together. When the fan blade 64 rotates, the grain falling through the interception net 37 is subjected to impurity air separation, and the impurities in the grain are blown out. The interception net 37 intercepts the grain in the interception net 37, and the impurities fly out through the mesh holes on the interception net 37.

[0032] 2. During transportation, when there is no agglomeration in the grain, the dispersed grain can smoothly pass through the main filter 41 and the slave filter 42 without being intercepted by the main filter 41. If there is agglomeration in the grain, it will be intercepted by the main filter 41. The pressure sensor inside the main filter 41 converts the physical pressure into an electrical signal, which is then transmitted to the controller. The controller converts it into a control signal and sends it to the actuator, thereby turning on the heating wire inside the slave filter 42. The heating wire inside the slave filter 42 generates heat to dry the agglomerated grain. At the same time, the rotating conveying shaft 31 drives the rotating shaft 52 and the missing gear 53 to rotate through the transmission connection. When the missing gear 53 rotates, the meshing transmission between it and the arc-shaped rack 54 drives the arc-shaped rack 54 to rotate on the outside of the conveying cylinder 2. Since the second magnetic block inside the arc-shaped rack 54 is magnetically attracted to the first magnetic block inside the fixed frame 43, the arc-shaped rack 54 drives the slave filter 42 and the fixed frame 43 to slide synchronously when sliding. When the arc-shaped rack 54 slides downward, the arc The arc rack 54 drives the connecting rod 55 to compress the spring 57 inside the reset slide groove 56. Therefore, when the missing gear 53 is separated from the arc rack 54, under the action of the elastic force of the spring 57, the connecting rod 55 drives the arc rack 54 to reset, thereby making the arc rack 54 slide back and forth on the outside of the conveying cylinder 2, and finally making the slave filter 42 and the fixed frame 43 slide back and forth. When a part of the agglomerated grain passes through the main filter 41, it will be immediately broken up by the slave filter 42 that is in contact with the main filter 41 and reciprocates, until the agglomerated grain is completely broken up, and the pressure sensor inside the main filter 41 returns to a normal pressure value. By heating and breaking up the agglomerated grain by the slave filter 42, the adhesion between the grain particles can be effectively broken, so that the impurities in the grain can be exposed and separated from the grain, thereby avoiding the situation where the impurities are not completely removed due to the agglomeration of grain, improving the impurity removal rate in the grain, and significantly improving the purity and quality of the grain, reducing the food safety hazards that may be caused by the residual impurities.

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grain conveyor with impurity air separation function, characterized in that: The invention comprises a fixed seat (1), two support plates (11) are symmetrically fixedly mounted on the top of the fixed seat (1), a conveying cylinder (2) is fixedly mounted on the top of the two support plates (11), a conveying assembly (3) for conveying grain is arranged inside the conveying cylinder (2), a filtering assembly (4) for filtering and breaking up agglomerated grain is arranged inside the conveying cylinder (2), a driving assembly (5) for driving the filtering assembly (4) to operate is also arranged on the top of the fixed seat (1), and the conveying assembly (3) is transmission-connected to the driving assembly (5), and a wind selection assembly (6) for wind selection of impurities in grain is also arranged on one side of the conveying assembly (3); The filter assembly (4) comprises a main filter (41) fixedly mounted on the inner wall of the conveying cylinder (2), a pressure sensor being arranged inside the main filter (41), a secondary filter (42) being slidably mounted on the inner wall of the conveying cylinder (2), the secondary filter (42) being placed on a side of the main filter (41) close to the air selection assembly (6), and the main filter (41) and the secondary filter (42) being in close contact with each other, a heating wire being arranged inside the secondary filter (42), a fixing frame (43) being fixedly connected to the outer side of the secondary filter (42), and a first magnetic block being fixedly mounted inside the fixing frame (43).

2. A grain conveyor with impurity winnowing function according to claim 1, characterized in that: The driving assembly (5) comprises a vertical plate (51) fixedly mounted on the top of the fixing seat (1), and the vertical plate (51) is placed between two supporting plates (11), a rotating shaft (52) is rotatably mounted on the supporting plate (11) and the vertical plate (51), the conveying assembly (3) is drivingly connected with the rotating shaft (52), a missing gear (53) is fixedly mounted on the outer side of the rotating shaft (52), an arc-shaped rack (54) meshing with or disengaging from the missing gear (53) is rotatably mounted on the outer side wall of the conveying cylinder (2), and a second magnetic block magnetically attracted to the first magnetic block is fixedly mounted inside the arc-shaped rack (54).

3. The grain conveyor with impurity winnowing function according to claim 2 is characterized in that: A connecting rod (55) is fixedly mounted on one side of the arc-shaped rack (54) close to the vertical plate (51); a reset slide groove (56) is provided on one side of the vertical plate (51) close to the arc-shaped rack (54) and is limitedly slidably connected to the connecting rod (55); a spring (57) is fixedly mounted on the inner wall of the reset slide groove (56); and one end of the spring (57) close to the rotating shaft (52) is fixedly connected to the connecting rod (55).

4. The grain conveyor with impurity winnowing function according to claim 1, characterized in that: The conveying assembly (3) comprises a conveying shaft (31) rotatably mounted inside a conveying cylinder (2); the conveying shaft (31) movably penetrates a main filter screen (41) and a secondary filter screen (42); two spiral blades (32) are fixedly mounted on the outer side of the conveying shaft (31); the main filter screen (41) and the secondary filter screen (42) are arranged between the two spiral blades (32); a support plate (33) is fixedly mounted on the outer side of one end of the conveying cylinder (2) away from the secondary filter screen (42); a motor (34) is fixedly mounted on the side wall of the support plate (33); and one end of the conveying shaft (31) close to the motor (34) movably penetrates the side wall of the fixing seat (1) and is fixedly connected to the output end of the motor (34).

5. The grain conveyor with impurity winnowing function according to claim 4, characterized in that: The end of the conveying cylinder (2) close to the motor (34) is fixedly connected to a feed channel (35), and the end of the conveying cylinder (2) away from the motor (34) is fixedly connected to a discharge channel (36), and an interception net (37) is fixedly installed at the bottom of the discharge channel (36).

6. The grain conveyor with impurity winnowing function according to claim 4, characterized in that: The air selection component (6) includes a connecting plate (61) fixedly mounted on the outside of one of the support plates (11) away from the motor (34); a connecting shaft is rotatably mounted on the side of the connecting plate (61) close to the conveying cylinder (2); a worm gear (62) is fixedly mounted on the outside of the connecting shaft; the conveying shaft (31) is transmission-connected to the rotating shaft (52); a worm (63) meshing with the worm gear (62) is fixedly mounted on the outside of one end of the rotating shaft (52) close to the connecting plate (61); and a fan blade (64) is fixedly mounted on one end of the connecting shaft close to the conveying cylinder (2).

7. The grain conveyor with impurity winnowing function according to claim 1, characterized in that: A limiting sliding groove (44) is provided on the outer side of the fixed frame (43), and a limiting sliding rod (45) is fixedly mounted on the inner side wall of the conveying cylinder (2) and is slidably connected to the limiting sliding groove (44).

8. The grain conveyor with impurity winnowing function according to claim 3, characterized in that: A stabilizing slide groove (58) is provided on one side of the arc-shaped rack (54) close to the conveying cylinder (2), and a stabilizing slide rod (59) is fixedly mounted on the outer side wall of the conveying cylinder (2) and is limitedly slidably connected to the stabilizing slide groove (58).

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