Two-drive fan grain screening vehicle

Abstract

The two-drive fan grain screening vehicle comprises a driving mechanism, a grain screening shell and an air supply shell, a grain screening cavity is formed in the grain screening shell, a containing cavity is formed in the air supply shell, one end of the grain screening shell is connected with one end of the air supply shell, and the grain screening cavity is communicated with the containing cavity; a bran outlet is formed in the side, away from the air supply shell, of the grain screening shell, a grain outlet is formed in the bottom of the grain screening shell, a feeding hopper is arranged at the top of the grain screening shell, and a screening device is arranged above the feeding hopper; the driving mechanism comprises a rotating shaft and a motor, the rotating shaft is rotationally connected with the air supply shell and driven by a hand-cranking mechanism, an output shaft of the motor is connected with the rotating shaft, and the motor is electrically connected with power generation equipment. A fan is arranged on the rotating shaft located in the containing cavity, and the communicating position of the grain screening cavity and the containing cavity is located on the air outlet side of the fan. The grain screening machine is simple in structure, easy to manufacture, capable of being driven through multiple energy supply modes such as manual mechanical energy, wind power generation and solar power generation, small in electric energy requirement and capable of meeting the grain screening requirement of remote areas.

Description

Technical Field

[0001] The invention relates to the technical field of grain screening equipment, and in particular to a two-wheel drive fan grain screening vehicle. Background Art

[0002] my country is a large agricultural country with many types of grains and high yields. In the process of grain processing, it is necessary to clean up various impurities such as soil, sand, or straw in the grain to improve the quality of the grain, which includes screening and dust removal of agricultural products. At present, there are various automatic grain screening equipment, but in many remote areas, due to inconvenient transportation and power supply difficulties, modern equipment cannot be introduced. People in these areas can only use relatively primitive methods when screening grain, such as using bamboo winnowing baskets to winnow grain and remove bran, which is time-consuming and labor-intensive. Therefore, a grain screening vehicle with simple structure, easy production, and time-saving and labor-saving is needed. Summary of the invention

[0003] In order to solve the problems in the background technology, the present invention proposes a two-drive fan grain screening vehicle, comprising a driving mechanism, a grain screening housing and an air supply housing, wherein a grain screening cavity is provided in the grain screening housing, a containing cavity is provided in the air supply housing, one end of the grain screening housing is connected to one end of the air supply housing, and the grain screening cavity is communicated with the containing cavity; The grain screening housing is provided with a bran outlet on one side away from the air supply housing, a grain outlet is provided at the bottom of the grain screening housing, a feed hopper is provided on the top of the grain screening housing, the feed hopper is connected with the grain screening cavity, and a screening device is provided above the feed hopper; The driving mechanism includes a rotating shaft and a motor, the rotating shaft is rotatably connected to the air supply housing, one end of the rotating shaft is located in the accommodating cavity, and the other end of the rotating shaft extends outside the air supply housing. A first driven wheel is coaxially fixed to one end of the rotating shaft located outside the air supply housing, and a first driving wheel is rotatably connected to the outer wall of the air supply housing. The first driving wheel is driven by a hand-cranked mechanism, and the first driving wheel and the first driven wheel are connected by a first synchronous belt. The motor output shaft is connected to the rotating shaft, and the motor is electrically connected to a power generation device; At least one fan is arranged on the rotating shaft in the accommodating chamber, and the connecting point between the grain screening chamber and the accommodating chamber is located at the air outlet side of the fan. Preferably, the screening device includes a rocker arm, a bracket and a screen, the bottom of the bracket is fixedly connected to the grain screening shell, there are four rocker arms, and the four rocker arms are respectively located at the four corners of the screen, one end of the rocker arm is hinged to the screen, and the other end of the rocker arm is hinged to the top of the bracket.

[0004] Preferably, the bracket is rotatably connected to a first gear, a connecting rod is provided on one side of the first gear, one end of the connecting rod is rotatably connected to the first gear, and the other end of the connecting rod is rotatably connected to the screen, the connection point between the connecting rod and the first gear is located on one side of the axis of the first gear, the rotating shaft is connected to the first gear through a transmission mechanism, and when the rotating shaft rotates, the first gear is driven to rotate through the transmission mechanism.

[0005] Preferably, the transmission mechanism includes a second gear, a first transmission shaft and a synchronous belt transmission mechanism, the first transmission shaft is rotatably arranged on one side of the air supply housing through a bearing seat, one end of the first transmission shaft is connected to the axis of the second gear, the other end of the first transmission shaft is connected to the rotating shaft through at least one set of synchronous belt transmission mechanisms, the second gear is rotatably connected to the bracket, and the second gear is meshed with the first gear; The synchronous belt transmission mechanism comprises a driving pulley and a driven pulley, wherein the driving pulley is fixed on a rotating shaft, and the driven pulley is fixed on a first transmission shaft, and the driving pulley and the driven pulley are connected by a synchronous transmission belt.

[0006] Preferably, the second gear is located above the first transmission shaft, the first transmission shaft is connected to the second gear through the second transmission shaft, one end of the second transmission shaft is connected to an end of the first transmission shaft close to the second gear through a universal coupling, and the other end of the second transmission shaft is connected to the axis of the second gear through another universal coupling.

[0007] Preferably, the hand-cranked mechanism includes at least one group of gear transmission mechanisms, the gear transmission mechanism includes a driving gear and a driven gear, the driven gear and the first driving wheel are fixed on the same first connecting shaft, one end of the first connecting shaft is rotatably connected to the outer wall of the air supply housing, the driving gear is rotatably connected to the outer wall of the air supply housing, the driving gear is meshed with the driven gear, and a handle is provided on one side of the driving gear.

[0008] Preferably, an air outlet is provided at one end of the air supply shell close to the grain screening shell, and an air inlet is provided at one end of the grain screening shell close to the air supply shell. The air inlet is close to the bottom of the feed hopper, the radial dimension of the air inlet is smaller than the radial dimension of the air outlet, and the air inlet and the air outlet are connected through an air guide channel.

[0009] Preferably, it further comprises a support frame, the grain screening shell and the air supply shell are fixed on the top of the support frame, a plurality of spaced-apart supporting legs are fixed on the bottom of the support frame, and the grain outlet is located at the interval between adjacent supporting legs.

[0010] Preferably, a bran outlet shell is fixed on one side of the grain screening shell, the inner cavity of the bran outlet shell is connected with the grain screening cavity, the bran outlet shell shrinks obliquely downward from one end close to the grain screening shell to the end away from the grain screening shell, and the bran outlet is located at the bottom of the bran outlet shell.

[0011] Preferably, the power generation equipment includes a wind power fan and a solar panel, and the motor is electrically connected to the wind power fan and the solar panel respectively.

[0012] The beneficial effects of the present invention are: The present invention has a simple structure, is easy to manufacture, and has a low manufacturing cost. The parts and equipment used in the manufacture are also easy to transport and are minimally affected by transportation conditions. At the same time, the present invention can be driven by a variety of energy supply methods such as artificial mechanical energy, wind power generation, and solar power generation, without relying on third-party circuit power supply, and has a small demand for electricity. The present invention can meet the needs of grain screening in remote areas, and can also meet the use of places with small-scale grain screening needs such as scientific research institutes.

[0013] The invention has a two-level screening function, and the two-part screening structures for realizing the two-level grain screening can act synchronously, thereby saving manpower and ensuring the grain screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side view of the overall structure of the present invention; Figure 3 for Figure 2 Middle AA section view.

[0015] Numbers in the figure: 1. grain screening shell; 2. air supply shell; 3. grain screening chamber; 4. accommodating chamber; 5. air guide channel; 6. rotating shaft; 7. fan; 8. feed hopper; 9. first driven wheel; 10. first driving wheel; 11. first synchronous belt; 12. motor; 13. fixing frame; 14. grain outlet; 15. bran outlet; 16. sieve; 17. rocker arm; 18. bracket; 19. first gear; 20. second gear; 21. connecting rod; 22. first transmission shaft; 23. second transmission shaft; 24. driving pulley; 25. driven pulley; 26. synchronous transmission belt; 27. driving gear; 28. driven gear; 29. ​​handle; 30. supporting frame; 31. supporting leg; 32. bran outlet shell; 33. wind power fan. DETAILED DESCRIPTION

[0016] In order to make the present invention clearer and more understandable, the technical solution of the present invention is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the given embodiment is only one of the implementation methods and does not represent all embodiments.

[0017] In this article, the terms "inside, outside, up, down" and so on are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, they cannot be understood as an absolute limitation on the scope of protection.

[0018] Combined with Figure 1 -Attached Figure 3 , a two-drive fan grain screening vehicle comprises a driving mechanism, a grain screening housing 1 and an air supply housing 2, wherein the grain screening housing 1 is provided with a grain screening chamber 3, the air supply housing 2 is provided with a containing chamber 4, one end of the grain screening housing 1 is connected to one end of the air supply housing 2, and the grain screening chamber 3 is communicated with the containing chamber 4; The grain screening housing 1 is provided with a bran outlet 15 on one side away from the air supply housing 2, a grain outlet 14 is provided at the bottom of the grain screening housing 1, a feed hopper 8 is provided at the top of the grain screening housing 1, the feed hopper 8 is communicated with the grain screening chamber 3, a screening device is provided above the feed hopper 8, the screening device performs a preliminary screening on the grain, and larger debris such as stones and mud are screened and retained in the screening device, and the grain enters the feed hopper 8 through the screening device; The driving mechanism includes a rotating shaft 6 and a motor 12, the rotating shaft 6 is rotatably connected to the air supply housing 2, one end of the rotating shaft 6 is located in the accommodating chamber 4, and the other end of the rotating shaft 6 extends to the outside of the air supply housing 2, and a first driven wheel 9 is coaxially fixed to one end of the rotating shaft 6 located outside the air supply housing 2, and a first driving wheel 10 is rotatably connected to the outer wall of the air supply housing 2, and the first driving wheel 10 is driven by a hand-cranked mechanism, and the first driving wheel 10 and the first driven wheel 9 are connected by a first synchronous belt 11, and the output shaft of the motor 12 is connected to the rotating shaft 6, and the motor 12 is electrically connected to a power generation device; At least one fan 7 is provided on the rotating shaft 6 located in the accommodating chamber 4. When two or more fans 7 are provided, the fans 7 are arranged in sequence along the axial direction of the rotating shaft 6 at intervals, and the wind force can be increased by increasing the number of fans 7; the connection between the grain screening chamber 3 and the accommodating chamber 4 is located on the air outlet side of the fan 7; the grain after the initial screening falls into the grain screening chamber 3 through the feed hopper 8, and the grain screening chamber 3 is ventilated by the rotation of the fan 7. After the grain is blown by the wind during the falling process, light debris such as chaff, sand, and incomplete grains mixed in the grain are blown out of the grain by the wind, thereby realizing the second screening of the grain.

[0019] Specifically, the inner wall of the feed hopper 8 is affixed with a moisture-proof film, which has a moisture-proof effect and can make the food slide more easily. More specifically, the feed hopper 8 includes four isosceles trapezoidal plates, which are spliced ​​together by a dovetail structure to form the feed hopper 8.

[0020] Specifically, the screening device includes a swing rod 17, a bracket 18 and a screen 16. The bottom of the bracket 18 is fixedly connected to the grain screening housing 1. There are four swing rods 17, which are respectively located at the four corners of the screen 16. One end of the swing rod 17 is hinged to the screen 16, and the other end of the swing rod 17 is hinged to the top of the bracket 18. The screen 16 is hinged to the bracket 18 through the swing rod 17. When the screen 16 is pushed, the screen 16 can be swung. By swinging the screen 16, the grain in the screen 16 is vibrated to improve the screening effect. When the grain is placed on the screen 16 during the initial screening, the grain will pass through the screen 16, and the debris such as stones and mud will remain on the screen 16.

[0021] More specifically, the screen 16 is detachably arranged in the fixed frame, the swing rod 17 and the connecting rod 21 are connected to the fixed frame, and the detachable connection of the screen 16 can realize the replacement of the screen 16, that is, the screen 16 with a suitable mesh size is selected according to the grain to be screened. The detachable connection can be bolted, magnetically connected, or snap-fitted.

[0022] Specifically, a first gear 19 is rotatably connected to the bracket 18, and a connecting rod 21 is provided on one side of the first gear 19. One end of the connecting rod 21 is rotatably connected to the first gear 19, and the other end of the connecting rod 21 is rotatably connected to the screen 16. The connection point between the connecting rod 21 and the first gear 19 is located on one side of the axis of the first gear 19. The rotating shaft 6 is connected to the first gear 19 through a transmission mechanism. When the rotating shaft 6 rotates, the first gear 19 is driven to rotate through the transmission mechanism. After the first gear 19 rotates, the first gear 19 will drive the connecting rod 21 to move back and forth, and then drive the screen 16 to swing back and forth through the connecting rod 21.

[0023] Specifically, the transmission mechanism includes a second gear 20, a first transmission shaft 22 and a synchronous belt transmission mechanism, the first transmission shaft 22 is rotatably arranged on one side of the air supply housing 2 through a bearing seat, one end of the first transmission shaft 22 is connected to the axis of the second gear 20, and the other end of the first transmission shaft 22 is connected to the rotating shaft 6 through at least one set of synchronous belt transmission mechanisms, the second gear 20 is rotatably connected to the bracket 18, and the second gear 20 is meshed with the first gear 19; The synchronous belt transmission mechanism includes a driving pulley 24 and a driven pulley 25, wherein the driving pulley 24 is fixed on the rotating shaft 6, and the driven pulley 25 is fixed on the first transmission shaft 22, and the driving pulley 24 and the driven pulley 25 are connected by a synchronous transmission belt 26. When the rotating shaft 6 is rotated by the motor 12 or the hand-crank mechanism, the rotating shaft 6 drives the fan 7 to rotate, and at the same time, the rotating shaft 6 drives the driving pulley 24 to rotate, and the driving pulley 24 drives the driven wheel to rotate through the synchronous transmission belt 26, and the driven wheel drives the first transmission shaft 22 to rotate, and the first transmission shaft 22 then drives the second gear 20 to rotate, and the second gear 20 drives the first gear 19 to transmit, and finally the fan 7 rotates and the screen 16 swings at the same time, and the two-stage screening action is synchronized, thereby improving the screening efficiency.

[0024] More specifically, there are two groups of the synchronous belt transmission mechanisms, the driving pulley 24 and the driven pulley 25 in the same group of synchronous belt transmission mechanisms are connected by the same synchronous transmission belt 26, the synchronous belt transmission mechanism in which the driving pulley 24 is arranged on the rotating shaft 6 is the first group, and the synchronous belt transmission mechanism in which the driven pulley 25 is arranged on the first transmission shaft 22 is the second group, the driven pulley 25 in the first group of synchronous belt transmission mechanisms and the driving pulley 24 in the second group of synchronous belt transmission mechanisms are coaxially fixed on the same rotating shaft, and one end of the rotating shaft is rotatably connected to the outer wall of the air supply casing.

[0025] Specifically, the second gear 20 is located above the first transmission shaft 22, so that the first gear 19 and the second gear 20 can be closer to the screen 16, so that the connecting rod 21 does not need to be set too long, and the connecting rod 21 is prevented from interfering with the grain screening housing 1, the bracket 18 or the air supply housing 2 when the connecting rod 21 is too long; the first transmission shaft 22 is connected to the second gear 20 through the second transmission shaft 23, and one end of the second transmission shaft 23 is connected to the end of the first transmission shaft 22 close to the second gear 20 through a universal coupling, and the other end of the second transmission shaft 23 is connected to the axis of the second gear 20 through another universal coupling. The second gear 20 and the first transmission shaft 22 are connected by the second transmission shaft 23 and the universal coupling, so that when the second gear 20 and the first transmission shaft 22 are not coaxial, the first transmission shaft 22 can transmit the second gear 20.

[0026] Specifically, the hand-crank mechanism includes at least one set of gear transmission mechanisms, and the gear transmission mechanism includes a driving gear 27 and a driven gear 28. The driven gear 28 and the first driving wheel 10 are fixed on the same first connecting shaft, one end of the first connecting shaft is rotatably connected to the outer wall of the air supply housing 2, the driving gear 27 is rotatably connected to the outer wall of the air supply housing 2, the driving gear 27 is meshed with the driven gear 28, and a handle 29 is provided on one side of the driving gear 27. The number of gear transmission mechanisms can be set according to transmission needs, such as by setting multiple sets of gear transmission mechanisms to avoid interference between the driving gear 27 where the handle 29 is located and other gears or shafts, or by setting multiple sets of gear transmission mechanisms to change the rotation speed ratio of the driving gear 27 and the rotating shaft 6.

[0027] More specifically, there are two groups of gear transmission mechanisms, the driving gear 27 and the driven gear 28 in the same group of gear transmission mechanisms are meshed, the driving gear 27 connected to the handle 29 is the first group of gear transmission mechanisms, and the other group of gear transmission mechanisms is the second group, the driven gear 28 in the first group of gear transmission mechanisms is coaxially fixed with the driving gear 27 in the second group of gear transmission mechanisms on the same rotating shaft, one end of the rotating shaft is rotatably connected to the outer wall of the air supply housing 2, and the driven gear 28 in the second group of gear transmission mechanisms is arranged on the rotating shaft 6.

[0028] Specifically, an air outlet is provided at one end of the air supply housing 2 close to the grain screening housing 1, and an air inlet is provided at one end of the grain screening housing 1 close to the air supply housing 2, the air inlet is close to the bottom of the feed hopper 8, the radial dimension of the air inlet is smaller than the radial dimension of the air outlet, and the air inlet and the air outlet are connected through the air guide channel 5. The arrangement of the air guide channel 5, the air outlet and the air inlet can achieve a narrow tube effect, so that the wind force passing through the air guide channel 5, the air outlet and the air inlet is greater, and the wind force is further increased, thereby improving the screening effect.

[0029] Specifically, it also includes a support frame 30, the grain screening housing 1 and the air supply housing 2 are fixed on the top of the support frame 30, a plurality of spaced legs 31 are fixed on the bottom of the support frame 30, and the grain outlet 14 is located at the intervals between adjacent legs 31. The support frame 30 and the legs 31 can increase the height of the grain outlet 14, thereby facilitating the output and collection of grain.

[0030] Specifically, a bran outlet housing 32 is fixed to one side of the grain screening housing 1, and the inner cavity of the bran outlet housing 32 is connected with the grain screening cavity 3. The bran outlet housing 32 is contracted obliquely downward from one end close to the grain screening housing 1 to the end away from the grain screening housing 1, and the bran outlet 15 is located at the bottom of the bran outlet housing 32. The bran and other debris separated by the wind can enter the bran outlet housing 32 along the wind direction, and the inclined design of the bran outlet housing 32 can make the separated bran and other debris fall to the bran outlet 15 along the inner wall of the bran outlet housing 32, which is more convenient for collecting the bran and other debris, and can also prevent the bran and other debris from falling back into the grain screening bin.

[0031] Specifically, the power generation equipment includes a wind power fan 33 and a solar panel, and the motor 12 is electrically connected to the wind power fan 33 and the solar panel respectively, and the motor 12 can be powered by the wind power fan 33 or the solar panel. The setting of the power generation equipment can realize the conversion of wind energy and solar energy into electrical energy, which is green and environmentally friendly. The grain screening vehicle of the present invention can realize the selection of two driving modes: manual drive and electric drive.

[0032] Specifically, the motor 12 is fixedly connected to the support frame 30 or the air supply housing 2 through the fixing frame 13, and the output shaft of the motor 12 is connected to the rotating shaft 6, and the fixing frame 13 provides an installation position for the motor 12. When the motor 12 is manually driven, the rotating shaft 6 rotates and also drives the output shaft of the motor 12 to rotate, thereby achieving a power generation effect.

[0033] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Two-drive fan grain screening vehicle, characterized by: The invention comprises a driving mechanism, a grain screening housing (1) and an air supply housing (2); a grain screening chamber (3) is provided in the grain screening housing (1), a containing chamber (4) is provided in the air supply housing (2), one end of the grain screening housing (1) is connected to one end of the air supply housing (2), and the grain screening chamber (3) is in communication with the containing chamber (4); A bran outlet (15) is provided on a side of the grain screening housing (1) away from the air supply housing (2), a grain outlet (14) is provided at the bottom of the grain screening housing (1), a feed hopper (8) is provided at the top of the grain screening housing (1), the feed hopper (8) is communicated with the grain screening chamber (3), and a screening device is provided above the feed hopper (8); The driving mechanism comprises a rotating shaft (6) and a motor (12), wherein the rotating shaft (6) is rotatably connected to the air supply housing (2), one end of the rotating shaft (6) is located in the accommodating chamber (4), and the other end of the rotating shaft (6) extends outside the air supply housing (2), a first driven wheel (9) is coaxially fixed to the end of the rotating shaft (6) located outside the air supply housing (2), and a first driving wheel (10) is rotatably connected to the outer wall of the air supply housing (2), the first driving wheel (10) is driven by a hand-cranked mechanism, the first driving wheel (10) and the first driven wheel (9) are connected by a first synchronous belt (11), the output shaft of the motor (12) is connected to the rotating shaft (6), and the motor (12) is electrically connected to a power generation device; At least one fan (7) is provided on the rotating shaft (6) located in the accommodating chamber (4), and the connection point between the grain screening chamber (3) and the accommodating chamber (4) is located on the air outlet side of the fan (7).

2. The two-drive fan grain screening vehicle according to claim 1, characterized in that: The screening device comprises a swing rod (17), a bracket (18) and a screen (16); the bottom of the bracket (18) is fixedly connected to the grain screening housing (1); there are four swing rods (17), which are respectively located at four corners of the screen (16); one end of the swing rod (17) is hinged to the screen (16), and the other end of the swing rod (17) is hinged to the top of the bracket (18).

3. The two-drive fan grain screening vehicle according to claim 2 is characterized in that: The bracket (18) is rotatably connected to a first gear (19); a connecting rod (21) is provided on one side of the first gear (19); one end of the connecting rod (21) is rotatably connected to the first gear (19); the other end of the connecting rod (21) is rotatably connected to the screen (16); a connection point between the connecting rod (21) and the first gear (19) is located on one side of the axis of the first gear (19); the rotating shaft (6) is connected to the first gear (19) via a transmission mechanism; when the rotating shaft (6) rotates, the first gear (19) is driven to rotate via the transmission mechanism.

4. The two-drive fan grain screening vehicle according to claim 3 is characterized in that: The transmission mechanism comprises a second gear (20), a first transmission shaft (22) and a synchronous belt transmission mechanism, wherein the first transmission shaft (22) is rotatably arranged on one side of the air supply housing (2) via a bearing seat, one end of the first transmission shaft (22) is connected to the axis of the second gear (20), and the other end of the first transmission shaft (22) is connected to the rotating shaft (6) via at least one set of synchronous belt transmission mechanisms, the second gear (20) is rotatably connected to the bracket (18), and the second gear (20) is meshed with the first gear (19); The synchronous belt transmission mechanism comprises a driving pulley (24) and a driven pulley (25), wherein the driving pulley (24) is fixed on a rotating shaft (6), and the driven pulley (25) is fixed on a first transmission shaft (22), and the driving pulley (24) and the driven pulley (25) are connected via a synchronous transmission belt (26).

5. The two-drive fan grain screening vehicle according to claim 4, characterized in that: The second gear (20) is located above the first transmission shaft (22); the first transmission shaft (22) is connected to the second gear (20) via a second transmission shaft (23); one end of the second transmission shaft (23) is connected to an end of the first transmission shaft (22) close to the second gear (20) via a universal coupling; the other end of the second transmission shaft (23) is connected to the axis of the second gear (20) via another universal coupling.

6. The two-drive fan grain screening vehicle according to claim 1, characterized in that: The hand-crank mechanism comprises at least one set of gear transmission mechanisms, the gear transmission mechanism comprising a driving gear (27) and a driven gear (28), the driven gear (28) and the first driving wheel (10) being fixed on the same first connecting shaft, one end of the first connecting shaft being rotatably connected to the outer wall of the air supply housing (2), the driving gear (27) being rotatably connected to the outer wall of the air supply housing (2), the driving gear (27) being meshed with the driven gear (28), and a handle (29) being provided on one side of the driving gear (27).

7. The two-drive fan grain screening vehicle according to claim 1, characterized in that: An air outlet is provided at one end of the air supply housing (2) close to the grain screening housing (1), and an air inlet is provided at one end of the grain screening housing (1) close to the air supply housing (2), the air inlet is close to the bottom of the feed hopper (8), the radial dimension of the air inlet is smaller than the radial dimension of the air outlet, and the air inlet and the air outlet are connected via an air guide channel (5).

8. The two-drive fan grain screening vehicle according to claim 1, characterized in that: It also comprises a support frame (30), the grain screening housing (1) and the air supply housing (2) being fixed on the top of the support frame (30), a plurality of spaced-apart supporting legs (31) being fixed on the bottom of the support frame (30), and the grain outlet (14) being located at the intervals between adjacent supporting legs (31).

9. The two-drive fan grain screening vehicle according to claim 1, characterized in that: A bran discharge housing (32) is fixed to one side of the grain screening housing (1); the inner cavity of the bran discharge housing (32) is communicated with the grain screening cavity (3); the bran discharge housing (32) contracts obliquely downward from an end thereof close to the grain screening housing (1) to an end thereof away from the grain screening housing (1); and the bran discharge port (15) is located at the bottom of the bran discharge housing (32).

10. The two-drive fan grain screening vehicle according to claim 1, characterized in that: The power generation equipment comprises a wind power generation fan (33) and a solar panel, and the motor (12) is electrically connected to the wind power generation fan (33) and the solar panel respectively.

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