A pneumatic seeding mechanism and a pneumatic belt-feed precision seeding device using the same

Abstract

The present invention discloses a pneumatic seed-feeding mechanism and a pneumatic belt-feeding precision seed-feeding device applied thereto. The pneumatic seed-feeding mechanism comprises: an outer shell, a transmission shaft, a sealing ring, a cover plate, a socket barrel, a suction hole roller, a seed guide pipe, an air blowing pipe and an air suction pipe. Socket barrel is provided with sockets, and the suction hole roller is provided with group suction holes corresponding to the sockets. The group suction holes include at least two suction holes, and spherical columns are provided between any adjacent suction holes. The present invention discharges seeds into the seed-feeding mechanism evenly and with high precision, and will not damage the seeds during the seed-feeding process. A pneumatic belt-feeding precision seed-feeding device comprises a frame, the above-mentioned pneumatic seed-feeding mechanism and a belt-feeding mechanism. The belt-feeding mechanism comprises a large cover shell, a small cover shell, a driving pulley, a driven pulley and a synchronous belt. The synchronous belt is provided with partitions with equal intervals. The belt-feeding mechanism effectively reduces the seed-feeding height of the seed-feeding device, improves the hole-forming property, and realizes precise seed-feeding.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural sowing, and mainly relates to a pneumatic seeding mechanism and a pneumatic belt-feeding precision seeding device applied thereto. Background Art

[0002] Precision hole direct seeding technology can distribute seeds in the field accurately according to the required number of holes and hole spacing requirements based on the agronomic requirements of crop planting. It can save the amount of seeds needed for sowing and make the seedlings uniform and even, creating a reasonable field plant group structure for the later growth of crops, which is conducive to stable and increased yields.

[0003] The core component of mechanized precision hole-seeding technology is the precision seed meter. Currently, two main seed metering principles are used to achieve precision hole-seeding: mechanical and pneumatic. Mechanical seed metering requires high consistency in seed dimensions, making it difficult to accurately control the number of seeds per hole and prone to seed damage. Pneumatic seed metering, on the other hand, is highly adaptable to seed dimensions, making it easy to precisely control the number of seeds per hole without damaging the seeds.

[0004] Traditional precision seeding devices mostly use a tube-type seeding mechanism. The seeds in each hole collide randomly in the tube, resulting in poor consistency in the arrival of multiple seeds in each hole on the seed bed. The seeds also fall to the ground at a high speed and are prone to bouncing, resulting in poor seed formation in each hole. Summary of the Invention

[0005] In order to solve the technical problems existing in the background technology, the present invention proposes a pneumatic seeding mechanism and a pneumatic belt-feed precision seeding device applied thereto.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A pneumatic seeding mechanism comprises a housing, a transmission shaft, a sealing ring, a cover plate, a socket cylinder, a suction hole roller, a seed guide tube and an air suction pipe;

[0008] The outer shell is coaxially rotated and sleeved on the transmission shaft, the sealing ring is fixedly installed on the end surface of the outer shell, the cover plate is fixedly connected to the sealing ring, a cavity is formed between the outer shell, the sealing ring and the cover plate, the socket cylinder and the suction hole roller are arranged in the cavity, the suction hole roller is fixedly sleeved on the transmission shaft, the socket cylinder is fixedly installed in the suction hole roller, a plurality of sockets are opened on the socket cylinder, a plurality of group suction holes are opened on the suction hole roller, the group suction holes correspond to the sockets one by one, the group suction holes include at least two suction holes distributed along the busbar direction of the suction hole roller, a spherical column is provided between any two adjacent suction holes, and the spherical column is provided on the inner side wall of the suction hole roller;

[0009] An annular cavity is formed between the sealing ring, the outer shell and the suction hole roller, and a first upper air partition block, a second upper air partition block and a lower air partition block are provided in the annular cavity. The first upper air partition block, the second upper air partition block and the lower air partition block are fixedly mounted on the inner side wall of the outer shell, and a seed suction area is formed between the second upper air partition block and the lower air partition block. An air suction pipe is provided on the outer side wall of the outer shell, the air suction pipe is communicated with the annular cavity and corresponds to the seed suction area, and the air suction pipe is used to absorb seeds into the sockets located in the seed suction area; a seed cleaning area is formed between the first upper air partition block and the second upper air partition block, and after the sockets rotate to the seed cleaning area, the seeds leave the sockets due to the gravity of the seeds;

[0010] A seed inlet is provided on the cover plate, and the inner end surface of the suction hole drum, the cover plate and the socket tube form a seed storage cavity. The seed guide tube is fixedly mounted on the cover plate, and one end of the seed guide tube extends into the seed storage cavity and corresponds to the seed cleaning area. The seed guide tube is used to guide the seeds that fall from the sockets out of the seed discharging mechanism.

[0011] Preferably, an air blowing pipe is further provided on the outer wall of the shell, and the air blowing pipe is communicated with the annular cavity and corresponds to the seed cleaning area.

[0012] Preferably, the socket is conical, and the end with a smaller aperture is close to the suction hole roller.

[0013] Preferably, the socket cylinder is connected to the inner side wall of the suction hole drum by screws.

[0014] Preferably, the spherical column is installed on the inner wall of the suction hole roller through a thread, and the height of the spherical column protruding from the suction hole roller can be adjusted by rotating the spherical column.

[0015] Preferably, the cover plate is provided with a seed unloading opening, and a seed unloading plate is detachably installed in the seed unloading opening.

[0016] A pneumatic belt-feed precision seeding device comprises a frame, a belt-feeding mechanism and the above-mentioned pneumatic seeding mechanism, wherein the outer end surface of the housing is fixedly connected to the frame;

[0017] The belt-type seeding mechanism includes a large cover, a small cover, a driving pulley, a driven pulley and a synchronous belt;

[0018] The large cover shell is detachably connected to the small cover shell. The large cover shell is fixedly mounted on the cover plate. A seeding port is provided on the lower half of the large cover shell. A connecting hole is provided on the top of the large cover shell. The connecting hole is connected to the seed guide tube. A driving pulley, a driven pulley and a synchronous belt are provided between the large cover shell and the small cover shell.

[0019] One end of the transmission shaft extends between the large cover and the small cover, the driving pulley is fixedly sleeved on the transmission shaft, the driven pulley is rotatably connected to the fixed shaft on the frame, the synchronous belt is sleeved on the driving pulley and the driven pulley, and multiple partitions are provided on the outside of the synchronous belt, and a seed storage tank is formed between any two adjacent partitions.

[0020] Preferably, the angle between the upper edge of the seeding opening and the horizontal direction is equal to the movement friction angle δ of the seed.

[0021] Preferably, an angle β is formed between a center line connecting the driven pulley and the driving pulley and the horizontal direction, and the angle β is smaller than the complementary angle of the movement friction angle δ of the seed.

[0022] Preferably, the driven pulley and the driving pulley are toothed pulleys, and the synchronous belt is a toothed synchronous belt.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the present invention, the socket cylinder and the suction hole roller rotate synchronously, and the seeds entering the housing assembly from the seed feeding tube are adsorbed on the socket cylinder by the suction hole roller, and the multiple seeds on the socket cylinder are synchronously discharged into the seed dropping mechanism by the suction hole roller, so that the pneumatic seeding mechanism can discharge the seeds into the seed dropping mechanism evenly and accurately without damaging the seeds in the process;

[0025] 2. In the present invention, adjacent suction holes are separated by spherical columns, so that each suction hole only absorbs one seed, and the number of seeds in each hole is equal, achieving accurate seed placement;

[0026] 3. In the present invention, the belt-type seeding mechanism can realize hole inoculation, seed delivery and seeding, effectively reducing the seeding height of the seeding device, ensuring the number of seeds sown in each hole, and realizing precise hole inoculation and seeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Exploded view of the pneumatic seed metering mechanism of the present invention;

[0028] Figure 2 This is a partial enlarged view of the suction ring roller of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention;

[0030] Figure 4 This is a partial cross-sectional view of the installation of the socket drum and the suction hole drum of the present invention;

[0031] Figure 5 This is an exploded view of the pneumatic belt-feed precision seed metering device of the present invention;

[0032] Figure 6 This is a schematic diagram of the assembly of the synchronous belt and the large cover of the present invention;

[0033] Figure 7 Schematic diagram of the pulley deflection angle β and the angle δ between the upper edge of the seeding port opening and the horizontal plane according to the present invention.

[0034] In the figure: 1-frame; 2-housing; 3-drive shaft; 4-sealing ring; 5-cover plate; 6-socket cylinder; 60-socket; 7-suction hole roller; 700-suction hole; 8-seed guide tube; 9-suction pipe; 10-air blowing pipe; 11-spherical column; 12-seed unloading plate; 13-screw; 14-large cover shell; 15-small cover shell; 16-driving pulley; 17-driven pulley; 18-synchronous belt; 19-partition plate; 22-seed inlet tube; 24-first upper air separator block; 25-second upper air separator block; 26-lower air separator block. DETAILED DESCRIPTION

[0035] like Figure 1-4 The pneumatic seed metering mechanism shown in the figure includes a housing 2, a transmission shaft 3, a sealing ring 4, a cover plate 5, a socket cylinder 6, a suction hole drum 7, a seed guide tube 8 and an air suction pipe 9;

[0036] The outer shell 2 is coaxially rotated and sleeved on the transmission shaft 3. The outer shell 2 is connected to the transmission shaft 3 through a bearing. A bearing cover is provided on the outer end face of the outer shell 2. The bearing cover is used to fix and position the bearing. The sealing ring 4 is fixedly installed on the end face of the outer shell 2 by bolts, and a rubber sealing ring is provided between the sealing ring 4 and the outer shell 2 to ensure sealing. The cover plate 5 is fixedly connected to the sealing ring 4 by bolts. A gasket is also provided between the sealing ring 4 and the cover plate 5. A cavity is formed between the outer shell 2, the sealing ring 4 and the cover plate 5. The socket tube 6 and the suction hole roller 7 are provided in the cavity. The suction hole roller 7 is fixedly sleeved on the transmission shaft 3. The socket tube 6 is screwed The nail 13 is fixedly installed in the suction hole roller 7. A plurality of sockets 60 are provided on the socket cylinder 6. The sockets 60 are conical, and the end with a smaller aperture is close to the suction hole roller 7. A plurality of group suction holes are provided on the suction hole roller 7. The group suction holes correspond to the sockets 60 one by one. The group suction holes include three suction holes 700 distributed along the busbar direction of the suction hole roller 7. A spherical column 11 is provided between any two adjacent suction holes 700, and the spherical column 11 is provided on the inner wall of the suction hole roller 7. An annular cavity is formed between the sealing ring 4, the outer shell 2 and the suction hole roller 7, and a first upper air barrier block 24 and a second upper air barrier block 25 are provided in the annular cavity. And the lower air partition block 26, the first upper air partition block 24, the second upper air partition block 25 and the lower air partition block 26 are fixedly installed on the inner wall of the shell 2, and a seed suction area is formed between the second upper air partition block 25 and the lower air partition block 26. The suction pipe 9 is arranged on the outer wall of the shell 2, and the suction pipe 9 is communicated with the annular cavity and corresponds to the seed suction area. The suction pipe 9 is used to adsorb the seeds in the sockets 60 located in the seed suction area; a seed cleaning area is formed between the first upper air partition block 24 and the second upper air partition block 25, and the sockets 60 leave the sockets 60 due to the gravity of the seeds after rotating to the seed cleaning area; a seed inlet is opened on the cover plate 5, and the seed inlet is connected to the seed inlet Tube 22, the inner end surface of the suction hole drum 7, the cover plate 5 and the socket tube 6 form a seed storage cavity, and the seed guide tube 8 is fixedly installed on the cover plate 5. One end of the seed guide tube 8 extends into the seed storage cavity and corresponds to the seed cleaning area. The seed guide tube 8 is used to guide the seeds dropped from the socket 60 out of the seed discharge mechanism; an air blowing pipe 10 is also provided on the outer wall of the outer shell 2, and the air blowing pipe 10 is communicated with the annular cavity and corresponds to the seed cleaning area; the spherical column 11 is installed on the inner wall of the suction hole drum 7 through a thread, and the spherical column 11 can be rotated to adjust the height of the spherical column 11 protruding from the suction hole drum 7; a seed unloading port is opened on the cover plate 5, and a seed unloading plate 12 is detachably installed in the seed unloading port.

[0037] During operation, the external power provides power to the transmission shaft 3 through the chain drive, driving the transmission shaft 3 to rotate, and the air source of the seeder is connected to the suction pipe 9 and the blowing pipe 10 of the seeding device, which increases the required seed suction negative pressure and seed cleaning positive pressure for the seeding device. The seeds enter the seed storage chamber of the pneumatic seeding mechanism from the seed inlet pipe 22. As the suction hole drum 7 rotates, the seeds are filled into the sockets 60 of the socket tube 6 under the action of their own gravity and centrifugal inertia. The seeds at the bottom of the sockets 60 are sucked in the middle of the seed suction area. The negative pressure seed suction area formed by the trachea is adsorbed. In the seed suction area, the seeds are adsorbed in the sockets 60 due to the pressure difference. The adjacent suction holes 700 are separated by the spherical columns 11, so that each suction hole 700 only adsorbs one seed, and the number of seeds in each socket 60 is equal. When the suction hole 700 for adsorbing seeds is transferred to the second upper air separation block 25, the negative pressure of the suction hole is blocked, and the negative pressure adsorption force of the suction hole in the seed cleaning area disappears. The seeds in the socket 60 are discharged through the seed guide tube 8 under the action of their own gravity.

[0038] In this embodiment, preferably, an air blowing pipe 10 is further provided on the outer wall of the shell 2. The air blowing pipe 10 is communicated with the annular cavity and corresponds to the seed cleaning area. When the seeds move to the top, the first upper air-trapping block 24 and the second upper air-trapping block 25 block the suction force of the adsorbed seeds, and the seeds fall by their own weight. The air blowing pipe 10 prevents the tip of one end of some varieties of seeds (such as rice seeds) from being inserted into the suction hole 700 or debris from blocking the suction hole 700. Blowing can help the seeds inserted into the suction hole 700 to fall off, and clean the suction hole 700 to prevent the suction hole from being blocked, thereby ensuring the reliability of the work.

[0039] In this embodiment, the socket 60 is preferably conical, and the end with a smaller aperture is close to the suction hole roller 7, which facilitates the adsorption of seeds in the socket cylinder 60. At the same time, under the action of the air flow of the blowing pipe 10, seeds and debris are prevented from being stuck in the suction hole 700.

[0040] Preferably, in this embodiment, the socket tube 6 is fixedly connected to the inner wall of the suction hole roller 7 by screws 13, and the outer wall of the socket tube 6 and the inner wall of the suction hole roller 7 are coaxial and have the same diameter, which facilitates the fixing and disassembly of the socket tube 6.

[0041] In this embodiment, the spherical column 11 is preferably installed on the inner wall of the suction hole drum 7 through a thread. The top of the spherical column 11 is spherical, and the bottom end of the spherical column 11 is provided with an external thread. A threaded through hole is provided on the cylinder 70. The bottom end of the spherical column 11 is connected to the threaded through hole. Rotating the spherical column 11 can adjust the height of the spherical column 11 protruding from the suction hole drum 7. The protruding height of the spherical column 11 can be adjusted as needed according to the different seed dimensions.

[0042] In this embodiment, preferably, a seed unloading port is opened on the first circular bottom cover of the shell 2, and a seed unloading plate 12 is detachably installed in the seed unloading port. The seed unloading plate 12 is detachably connected to the sealing ring 4 by bolts, and the seed unloading plate 12 is convenient for removing undischarged seeds.

[0043] like Figure 5-7 The pneumatic belt-feed precision seeding device shown includes a frame 1, a belt-type seeding mechanism, and the above-mentioned pneumatic seeding mechanism. The outer end surface of the housing 2 is fixedly connected to the frame 1.

[0044] The belt-type seeding mechanism includes a large cover 14, a small cover 15, an arc-toothed driving pulley 16, an arc-toothed driven pulley 17 and an arc-toothed synchronous belt 18; the large cover 14 and the small cover 15 are detachably connected, the large cover 14 is fixedly mounted on the cover plate 5, the lower half of the large cover 14 is provided with a seeding port 140, the top of the large cover 14 is provided with a connecting hole, the connecting hole is connected to the seed guide tube 8, the arc-toothed driving pulley 16, the arc-toothed driven pulley 17 and the arc-toothed synchronous belt 18 are arranged between the large cover 14 and the small cover 15; One end of the driving shaft 3 extends between the large housing 14 and the small housing 15. The arc-toothed driving pulley 16 is fixedly mounted on the transmission shaft 3. The arc-toothed driven pulley 17 is rotatably mounted on the frame 1. A fixed shaft is fixed to the frame 1, and a bearing is mounted on the fixed shaft. The arc-toothed driven pulley 17 is rotatably mounted on the bearing. The arc-toothed synchronous belt 18 is mounted on the arc-toothed driving pulley 16 and the arc-toothed driven pulley 17. A plurality of partitions 19 are provided on the outer side of the arc-toothed synchronous belt 18. A seed storage tank is formed between any two adjacent partitions 19. The seeds discharged from the seed guide tube 8 enter the seed storage tank. The angle between the upper edge of the opening of the seed dropping port 140 and the horizontal direction is equal to the seed's motion friction angle δ. The angle β formed between the center line connecting the arc-toothed driven pulley 17 and the arc-toothed driving pulley 16 and the horizontal direction is less than the complementary angle of the seed's motion friction angle δ.

[0045] The working process of the present invention is:

[0046] During operation, the external transmission mechanism provides power to the transmission shaft 3, driving the transmission shaft 3 to rotate, and the air source of the seeder is connected to the suction pipe 9 and the blowing pipe 10 of the seeding device, so as to increase the required seed suction negative pressure and seed cleaning positive pressure for the seeding device, and the seeds enter the chamber of the pneumatic seeding mechanism suction hole drum 7 from the seed inlet pipe 22. As the suction hole drum 7 rotates, the seeds are filled into the sockets 60 of the socket tube 6 under the action of their own gravity and centrifugal inertia. The seeds at the bottom of the sockets 60 are adsorbed by the suction holes in the negative pressure adsorption arc section of the seed suction zone, and the adjacent suction holes 700 are separated by the spherical columns 11 so that each suction hole 700 only adsorbs one seed, and the number of seeds in each socket 6 is equal, and rotates with the suction hole drum 7. When the suction hole 7 rotates, the seeds are filled into the sockets 60 of the socket tube 6 under the action of their own gravity and centrifugal inertia. When the suction hole with attached seeds turns to the arc section of the positive pressure seed clearing zone formed by the first upper air-trapping block 24 and the second upper air-trapping block 25, the negative pressure adsorption force of the suction hole disappears, and the seeds in the socket 60 are formed into holes through the seed guide tube 8 under the action of their own gravity and the air flow blown by the air blower 10, and fall into the seed storage trough between the annular belts of the evenly distributed partitions 19 of the belt-type seeding mechanism. During the seed delivery process of the synchronous belt, the deflection angle of the two pulleys causes the seeds to gather in the seed storage trough formed by the partition 19 and the synchronous belt 18. When the upper partition 19 moves to the seeding port 140, and the inclination angle of the partition 19 to the horizontal ground is greater than the seed movement friction angle δ, the seeds roll or slide down from the partition 19, and are formed into holes and seeded at the seeding port 140, completing the entire seeding process.

[0047] In this embodiment, preferably, an angle β is formed between the center line of the arc-tooth driven pulley 17 and the arc-tooth active pulley 16 and the horizontal direction, and the angle β is smaller than the complementary angle of the movement friction angle δ of the seed, so as to prevent the seed from slipping out from between the two partitions 19 and being squeezed against the inner wall of the large cover 14 when the arc-tooth synchronous belt 18 rotates, causing damage to the seed.

[0048] In this embodiment, preferably, the angle between the upper edge of the opening of the seeding port 140 and the horizontal direction is equal to the movement friction angle δ of the seed. When the partition 19 is rotated to the seeding port 140, seeding can be achieved, making seeding accurate.

[0049] In this embodiment, preferably, the driven pulley 17 and the driving pulley 16 are arc tooth pulleys, the synchronous belt 18 is an arc tooth synchronous belt, and the belt and the pulley are engaged with teeth to ensure accurate seeding.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A pneumatic belt-feed precision seeding device, characterized by: It comprises a frame (1), a belt-type seeding mechanism and a pneumatic seeding mechanism, wherein the outer end surface of the housing (2) is fixedly connected to the frame (1); The belt-type seeding mechanism comprises a large cover (14), a small cover (15), a driving pulley (16), a driven pulley (17) and a synchronous belt (18); The large cover shell (14) is detachably connected to the small cover shell (15). The large cover shell (14) is fixedly mounted on the cover plate (5). A seeding port (140) is provided at the lower half of the large cover shell (14). A connecting hole is provided at the top of the large cover shell (14). The connecting hole is connected to the seed guide tube (8). A driving pulley (16), a driven pulley (17) and a synchronous belt (18) are provided between the large cover shell (14) and the small cover shell (15). One end of the transmission shaft (3) extends between the large cover (14) and the small cover (15), the driving pulley (16) is fixedly sleeved on the transmission shaft (3), the driven pulley (17) is rotatably connected to the rotating shaft on the frame (1), the synchronous belt (18) is sleeved on the driving pulley (16) and the driven pulley (17), and a plurality of partitions (19) are provided on the outer side of the synchronous belt (18), and a seed storage tank is formed between any two adjacent partitions (19); It comprises a housing (2), a transmission shaft (3), a sealing ring (4), a cover plate (5), a socket cylinder (6), a suction hole roller (7), a seed guide tube (8) and an air suction pipe (9); The outer shell (2) is coaxially rotatably sleeved on the transmission shaft (3), the sealing ring (4) is fixedly mounted on the end face of the outer shell (2), the cover plate (5) is fixedly connected to the sealing ring (4), a cavity is formed between the outer shell (2), the sealing ring (4) and the cover plate (5), the socket cylinder (6) and the suction hole roller (7) are arranged in the cavity, the suction hole roller (7) is fixedly sleeved on the transmission shaft (3), the socket cylinder (6) is fixedly mounted in the suction hole roller (7), a plurality of sockets (60) are provided on the socket cylinder (6), a plurality of group suction holes are provided on the suction hole roller (7), the group suction holes correspond to the sockets (60) one by one, the group suction holes include at least two suction holes (700) distributed along the busbar direction of the suction hole roller (7), a spherical column (11) is provided between any two adjacent suction holes (700), and the spherical column (11) is provided on the inner side wall of the suction hole roller (7); An annular cavity is formed between the sealing ring (4), the outer shell (2) and the suction hole roller (7), and a first upper air separator (24), a second upper air separator (25) and a lower air separator (26) are provided in the annular cavity. The first upper air separator (24), the second upper air separator (25) and the lower air separator (26) are fixedly mounted on the inner side wall of the outer shell (2), and a seed suction area is formed between the second upper air separator (25) and the lower air separator (26). An air suction pipe (9) is provided on the outer side wall of the outer shell (2), and the air suction pipe (9) is communicated with the annular cavity and corresponds to the seed suction area. The air suction pipe (9) is used to absorb seeds into the sockets (60) located in the seed suction area; a seed clearing area is formed between the first upper air separator (24) and the second upper air separator (25), and after the sockets (60) rotate to the seed clearing area, the seeds leave the sockets (60) due to the gravity of the seeds. A seed inlet is provided on the cover plate (5); the inner end surface of the suction hole roller (7), the cover plate (5) and the socket cylinder (6) form a seed storage cavity; a seed guide tube (8) is fixedly mounted on the cover plate (5); one end of the seed guide tube (8) extends into the seed storage cavity and corresponds to the seed cleaning area; the seed guide tube (8) is used to guide the seeds dropped from the socket (60) to the seed discharging mechanism; An air blowing pipe (10) is also provided on the outer wall of the housing (2), and the air blowing pipe (10) is communicated with the annular cavity and corresponds to the seed cleaning area; The socket (60) is conical, and the end with a smaller aperture is close to the suction hole roller (7); The angle between the upper edge of the seeding opening (140) and the horizontal direction is equal to the movement friction angle δ of the seed; An angle β is formed between a center line connecting the driven pulley (17) and the driving pulley (16) and the horizontal direction, and the angle β is smaller than the complementary angle of the motion friction angle δ of the seed.

2. The pneumatic belt-feed precision seeding device according to claim 1, characterized in that: The socket cylinder (6) is connected to the inner side wall of the suction hole roller (7) through a screw (13).

3. The pneumatic belt-feed precision seeding device according to claim 1, characterized in that: The spherical column (11) is installed on the inner side wall of the suction hole roller (7) through a thread, and the height of the spherical column (11) protruding from the suction hole roller (7) can be adjusted by rotating the spherical column (11).

4. The pneumatic belt-feed precision seed metering device according to claim 1, characterized in that: A seed unloading opening is formed on the cover plate (5), and a seed unloading plate (12) is detachably installed in the seed unloading opening.

5. The pneumatic belt-feed precision seed metering device according to claim 1, characterized in that: The driven pulley (17) and the driving pulley (16) are toothed pulleys, and the synchronous belt (18) is a toothed synchronous belt.

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