Air suction seed sowing device

Abstract

The utility model discloses an air suction seed-metering device which comprises a shell I and a shell II, the shell I is hinged with the shell II, and a feeding hole is formed in the top of the shell I; a partition I and a partition II are arranged in the shell I, one side of the partition is a working cavity, and the other side of the partition is a seeding cavity; a central cavity is formed in the center of the shell I, and a bolt is mounted in the central cavity; a blanking cavity is formed in one side of the central cavity and in the shell I; a scraper scale plate and a limiting plate are arranged above one side of the blanking cavity and on the shell I, and a scraper A is arranged between the scraper scale plate and the limiting plate; in the working cavity on one side of the scraper scale plate, a positioning seat is fixed on the shell I, and a scraper B is hinged in the positioning seat; a seed metering plate is mounted on the regular hexagonal end of the bolt, a negative pressure pipe is arranged outside the shell II, and a vacuum chamber communicated with the negative pressure pipe is arranged inside the shell II; a gear box is arranged below the feeding port and outside the shell I. A transmission shaft is arranged on one side of the gear box. According to the utility model, the seeding uniformity can be ensured, and germs of seeds cannot be damaged.

Description

Technical Field

[0001] The utility model relates to an air-suction seed metering device, belonging to the technical field of seeders. Background Art

[0002] During the working process of the existing air-suction seed metering device, the seed metering holes on the seed metering disc are likely to suck in two or three seeds at a time. When sowing seeds, this will cause uneven sowing, thereby affecting the growth rate and health status of seedlings. Secondly, shaving knives are arranged on the seed metering disc. The shaving knives are made of metal and are likely to damage the germ of the seeds during the working process, resulting in the seeds being unable to germinate and the sowing efficiency being reduced. Thirdly, the air suction volume of the seed metering holes cannot be adjusted. If the suction force is too large, it is likely to cause the seeds to be difficult to drop. Moreover, there is no adjusting device at the outlet of the discharge cavity, resulting in serious accumulation of seeds. Content of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the utility model provides an air-suction seed metering device, which can effectively solve the problem that the seed metering holes suck in two or three seeds at a time, ensure the uniformity of sowing, will not damage the germ of the seeds, and has stable operation.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows: an air-suction seed metering device includes an outer housing, and the outer housing further includes housing I and housing II. One side of housing I is hinged to one side of housing II, and housing I and housing II can be locked after being closed. There is a feed inlet at the top of housing I. Inside housing I, there are partition I and partition II. Partition I and partition II are of an integral curved structure, and the height of partition I is higher than that of partition II. One side of partition I and partition II is a working chamber, and the other side of partition I and partition II is a seed dropping chamber. The seed dropping chamber communicates with the working chamber at the position of partition II. There is a central chamber at the center of housing I. The central chamber is located in the working chamber, and a bolt is installed in the central chamber. The width of the central chamber is the same as that of partition I. On one side of the central chamber, there is a blanking chamber in housing I, and the blanking chamber communicates with the feed inlet and the working chamber.

[0005] Above the upper position on one side of the blanking chamber, there is a scraper scale plate and a limiting plate on housing I. The scraper scale plate is located above the limiting plate, and there is a scraper A between the scraper scale plate and the limiting plate. On the front and back sides of the scraper A, the scraper scale plate and the limiting plate, there is a clamping plate in common. The clamping plates on the front and back sides are fixed to housing I together with the scraper scale plate and the limiting plate.

[0006] In the working chamber on one side of the scraper scale plate, a positioning seat is fixed on the housing I, and an inclined L-shaped scraper B is hinged in the positioning seat; a circular seed metering disc is installed on the regular hexagonal end of the bolt, and a regular hexagonal limiting hole is provided at the center of the seed metering disc. The regular hexagonal end of the bolt is inserted into the limiting hole in a matching manner. The back plate of the seed metering disc is in contact with the front of the outer wall of the central cavity and the front of the partition I. A circle of evenly spaced seed metering holes is provided at the edge of the seed metering disc in the circumferential direction. Inside this circle of seed metering holes, a number of evenly spaced arc-shaped segmented brushes are installed on the back of the seed metering disc, and the brushes are hard brushes.

[0007] A negative pressure pipe is provided outside the housing II. An arc-shaped vacuum chamber is provided inside the housing II. The vacuum chamber is communicated with the negative pressure pipe, and a sealing ring is provided around the vacuum chamber; a circular groove-shaped positioning cover is provided at the center inside the housing II. The positioning cover can be in contact with the front plate of the seed metering disc, and the regular hexagonal end of the bolt is located in the positioning cover.

[0008] Below the feed inlet, a gearbox is provided outside the housing I. A transmission shaft is provided on one side of the gearbox. A gear a and a gear b are arranged inside the gearbox. Both the gear a and the gear b are bevel gears. The two gears are meshed and connected. The axle of the gear b is coaxial with the transmission shaft, and the axle of the gear a is coaxial with the bolt.

[0009] A positioning hook a is installed on the scraper A. The end of the body of the positioning hook a is jointly hinged with the clamping plate and the limiting plate. The main body of the positioning hook a is closely attached to the front of the scraper scale plate. The positioning hook a can rotate around the hinge point. Above the hinge point, one end of the body of the positioning hook a is hinged with one end of the connecting plate, and the other end of the connecting plate is fixed to the scraper A. The scraper A can move between the scraper scale plate and the limiting plate; a number of evenly spaced and arc-shaped positioning holes A are provided at the upper end of the plate body of the scraper scale plate. Numbers are provided below the positioning holes A, and the numbers are arranged in ascending order from left to right. The hook body of the positioning hook a is inserted into one of the positioning holes A.

[0010] The upper end of the scraper B is hinged with the body of the positioning hook b. The positioning hook b is located on the back of the scraper scale plate. The main body of the positioning hook b is closely attached to the back of the scraper scale plate; below the positioning holes A, a number of evenly spaced and vertically directed positioning holes B are provided at the edge of the plate body of the scraper scale plate. Numbers are provided on one side of the positioning holes B, and the numbers are arranged in ascending order from top to bottom. The positioning holes B are waist-shaped holes, and the hook body of the positioning hook b is inserted into one of the positioning holes B.

[0011] At the outlet of the blanking cavity, a bean separating plate is provided inside the housing I. Three spaced circular holes are provided in the upper plate body of the bean separating plate. One of the circular holes is fixedly connected to the inside of the housing I through a bolt, and the lower end of the bean separating plate is hinged to the inside of the housing I.

[0012] On the front of the positioning seat, a transparent ventilation plate is fixedly installed on the housing I; on the side close to the hinge of the housing I and the housing II, the end position of the vacuum chamber is the air stop node; on one side of the outlet of the seeding chamber, an arc-shaped brush groove is provided on the housing I.

[0013] On one side of the gearbox, a flip-up discharge door is installed outside the housing I. A snap ring is hinged on the discharge door. On the side where the housing I and the housing II are locked, a bent clamping plate is fixed on the side of the housing I, and the snap ring can tightly clamp the clamping plate; above the clamping plate, an observable window that can rotate is installed on the housing I.

[0014] The beneficial effects of the present utility model are as follows: By slightly adjusting the position of the scraper B, the problem that two or three seeds are sucked into the seeding holes at one time can be effectively solved. By adjusting the extended position of the scraper A, the size of the seeding holes passed through can be adjusted and the suction force can be controlled, and the air volume can be adjusted to prevent the seeds from being tightly sucked in the seeding holes and unable to break away, ensuring the uniformity of sowing. The use of the brush and the bean separating plate can neither damage the germ of the seeds nor prevent the accumulation of seeds. The transmission of the gears can ensure no loss of revolutions, with stable operation and low failure rate. Description of the Drawings

[0015] The following further describes the present utility model in conjunction with the drawings and specific embodiments.

[0016] Figure 1 is a schematic structural diagram of the present utility model when it is opened.

[0017] Figure 2 is an external schematic diagram of the housing II of the present utility model.

[0018] Figure 3 is an external schematic diagram of the housing I of the present utility model.

[0019] Figure 4 is a front schematic diagram of the seed metering disc of the present utility model.

[0020] Figure 5 is a back schematic diagram of the seed metering disc of the present utility model.

[0021] Figure 6 is an internal schematic diagram of the gearbox of the present utility model.

[0022] Figure 7 is Figure 1 a schematic diagram after installing the seed metering disc.

[0023] The reference numerals in the drawings:

[0024] 1. Outer housing, 2. Housing I, 3. Housing II, 4. Feed inlet, 5. Blanking cavity, 6. Central cavity, 7. Bolt, 8. Seed dropping cavity, 9. Bean separating plate, 10. Scraper A, 11. Scraper B, 12. Scraper scale plate, 13. Limiting plate, 14. Positioning hook a, 15. Ventilation plate, 16. Clamping plate, 17. Positioning hook b, 18. Positioning hole A, 19. Positioning hole B, 20. Positioning seat, 21. Positioning cover, 22. Vacuum chamber, 23. Negative pressure pipe, 24. Air stop node, 25. Gear box, 26. Gear a, 27. Gear b, 28. Discharge door, 29. Transmission shaft, 30. Partition I, 31. Partition II, 32. Seed metering disc, 33. Seed metering hole, 34. Brush, 35. Brush groove, 36. Working cavity, 37. Limiting hole, 38. Snap ring, 39. Clamping plate, 40. Observation window, 41. Connecting plate. Detailed implementation mode

[0025] As Figure 1 As shown in FIG. 7, an air suction seed metering device includes an outer housing 1, characterized in that: the outer housing 1 further includes a housing I 2 and a housing II 3, one side of the housing I 2 is hinged to one side of the housing II 3, and the housing I 2 and the housing II 3 can be locked after being closed. A feed inlet 4 is provided at the top of the housing I 2; a partition I 30 and a partition II 31 are provided inside the housing I 2. The partition I 30 and the partition II 31 are of an integral curved structure, and the height of the partition I 30 is higher than that of the partition II 31; one side of the partition I 30 and the partition II 31 is a working cavity 36, and the other side of the partition I 30 and the partition II 31 is a seed dropping cavity 8. The seed dropping cavity 8 communicates with the working cavity 36 at the position of the partition II 31; a central cavity 6 is provided at the center of the housing I 2. The central cavity 6 is located in the working cavity 36, and a bolt 7 is installed in the central cavity 6. The width of the central cavity 6 is the same as that of the partition I 30; on one side of the central cavity 6, a blanking cavity 5 is provided in the housing I 2, and the blanking cavity 5 communicates with the feed inlet 4 and the working cavity 36.

[0026] At the upper position on one side of the blanking cavity 5, a scraper scale plate 12 and a limiting plate 13 are provided on the housing I 2. The scraper scale plate 12 is located above the limiting plate 13. A scraper A 10 is provided between the scraper scale plate 12 and the limiting plate 13. Clamping plates 16 are commonly provided on the front and back sides of the scraper A 10, the scraper scale plate 12 and the limiting plate 13. The clamping plates 16 on the front and back sides are fixed to the housing I 2 together with the scraper scale plate 12 and the limiting plate 13.

[0027] In the working chamber 36 on one side of the scraper scale plate 12, a positioning seat 20 is fixed on the housing Ⅰ2. An L-shaped scraper B11 arranged obliquely is hinged in the positioning seat 20. A circular seed metering disc 32 is installed on the regular hexagonal end of the bolt 7. A regular hexagonal limiting hole 37 is provided at the center of the seed metering disc 32. The limiting hole 37 is fitted and penetrated into the regular hexagonal end of the bolt 7. The back disc body of the seed metering disc 32 is in contact with the front of the outer wall of the central cavity 6 and the front of the partition Ⅰ30. A circle of evenly spaced seed metering holes 33 is provided at the edge of the seed metering disc 32 in the circumferential direction. Inside this circle of seed metering holes 33, a number of evenly spaced arc-shaped segmented brushes 34 are installed on the back of the seed metering disc 32. The brushes 34 are hard brushes.

[0028] A negative pressure pipe 23 is provided outside the housing Ⅱ3. An arc-shaped vacuum chamber 22 is provided inside the housing Ⅱ3. The vacuum chamber 22 communicates with the negative pressure pipe 23. A sealing ring is provided around the vacuum chamber 22. A circular groove-shaped positioning cover 21 is provided at the center inside the housing Ⅱ3. The positioning cover 21 can be in contact with the front disc body of the seed metering disc 32. The regular hexagonal end of the bolt 7 is located in the positioning cover 21.

[0029] Below the feed inlet 4, a gearbox 25 is provided outside the housing Ⅰ2. A transmission shaft 29 is provided on one side of the gearbox 25. A gear a26 and a gear b27 are arranged inside the gearbox 25. Both the gear a26 and the gear b27 are bevel gears. The two gears are meshed and connected. The axle of the gear b27 is coaxial with the transmission shaft 29. The axle of the gear a26 is coaxial with the bolt 7.

[0030] A positioning hook a14 is installed on the scraper A10. The end of the body of the positioning hook a14 is jointly hinged with the clamping plate 16 and the limiting plate 13. The main body of the positioning hook a14 is closely attached to the front of the scraper scale plate 12. The positioning hook a14 can rotate around the hinge point. Above the hinge point, the body of the positioning hook a14 is hinged with one end of the connecting plate 41. The other end of the connecting plate 41 is fixed to the scraper A10. The scraper A10 can move between the scraper scale plate 12 and the limiting plate 13. A number of evenly spaced and arc-shaped positioning holes A18 are provided at the upper end of the plate body of the scraper scale plate 12. Corresponding numbers are provided below the positioning holes A18. The numbers are arranged in ascending order from left to right. The hook body of the positioning hook a14 is inserted into one of the positioning holes A18.

[0031] The upper end of the scraping knife B11 is hinged to the handle body of the positioning hook b17. The positioning hook b17 is located on the back of the scraping knife scale plate 12, and the main body of the positioning hook b17 is in close contact with the back surface of the scraping knife scale plate 12. Below the positioning hole A18, at the edge of the plate body of the scraping knife scale plate 12, a number of positioning holes B19 are provided at equal intervals and arranged in a vertical finger direction. A corresponding number is provided on one side of the positioning hole B19, and the numbers are arranged from small to large from top to bottom. The positioning hole B19 is an oval hole, and the hook body of the positioning hook b17 is inserted into one of the positioning holes B19.

[0032] At the outlet of the blanking cavity 5, a bean separating plate 9 is provided inside the housing Ⅰ2. Three spaced circular holes are provided in the upper plate body of the bean separating plate 9. One of the circular holes is fixedly connected to the inside of the housing Ⅰ2 by bolts, and the lower end of the bean separating plate 9 is hinged to the inside of the housing Ⅰ2.

[0033] On the front surface of the positioning seat 20, a transparent air exchange plate 15 is fixedly installed on the housing Ⅰ2; on the side close to the hinge of the housing Ⅰ2 and the housing Ⅱ3, the end position of the vacuum chamber 22 is the air stop node 24; on one side of the outlet of the seeding cavity 8, an arc-shaped brush groove 35 is provided on the housing Ⅰ2.

[0034] On one side of the gearbox 25, a flip-up discharge door 28 is installed outside the housing Ⅰ2. A snap ring 38 is hinged on the discharge door 28. On the side where the housing Ⅰ2 and the housing Ⅱ3 are locked, a bent clamping plate 39 is fixed on the side surface of the housing Ⅰ2, and the snap ring 38 can tightly clamp the clamping plate 39; above the clamping plate 39, an observable window 40 that can rotate is installed on the housing Ⅰ2.

[0035] During use, the drive shaft 29 is driven by a coupling on the tractor. The hydraulic motor on the tractor drives the fan, which is connected to the negative pressure pipe 23 through an air duct. The seed outlet of the seed dropping cavity 8 is connected to a seed guiding pipe. The seed discharging disc 32 has several different specifications according to the different sizes of the seed discharging holes 33, and different seed discharging discs 32 are selected according to the specifications of the seeds. The drive shaft 29 drives the gear b27 to rotate. Through meshing with the gear a26, the gear b27 drives the bolt 7 coaxial with the gear a26 to rotate. The regular hexagonal end of the bolt 7 drives the seed discharging disc 32 to make a counterclockwise rotational movement through the limiting hole 37. Seeds enter from the feed port 4, pass through the blanking cavity 5 and enter the working cavity 36. The fan works under the high-speed drive of the hydraulic motor. The original air in the vacuum chamber 22 is discharged at high speed and forms a vacuum state. At this time, a pressure difference is formed on both sides of the seed discharging disc 32, and the seed discharging holes 33 on the seed discharging disc 32 become air flow channels. At the same time, the brush 34 sweeps up the seeds at the bottom of the working cavity 36 to prevent seed accumulation. The seeds are adsorbed at the seed discharging holes 33 under the action of suction. Move the positioning hook a14 to the left, and the positioning hook a14 will drive the moving connecting plate 41 to move, and the connecting plate 41 will drive the scraper A10 to move to the left to adjust the extended position of the scraper A10. The scraper A10 is used to adjust the size of the orifice of the passing seed discharging hole 33. During the rotation of the seed discharging disc 32, the suction force is controlled and the air volume is adjusted by adjusting the size of the orifice of the seed discharging hole 33. The scraper scale plate 12 and the limiting plate 13 effectively limit the scraper A10. Sometimes, two seeds are simultaneously adsorbed in a seed discharging hole 33. Move the positioning hook b17 up and down, and the positioning hook b17 will drive the scraper B11 to make a slight rotation in the positioning seat 20. As the seed discharging disc 32 rotates, when the two seeds in the same seed discharging hole 33 pass through the position of the scraper B11, the excess seeds on the seed discharging disc 32 will be scraped off by the scraper B11. The scraper B11 adjusts the excess seeds in the seed discharging hole 33 to ensure that each seed discharging hole 33 individually adsorbs one seed. The seed discharging hole 33 with a single seed passes through the partition II 30 and turns into the seed dropping cavity 8. After passing through the air supply node 24, the seeds lose the adsorption force and fall into the seed guiding pipe through the seed outlet of the seed dropping cavity 8 by their own weight, and finally evenly fall into the seed furrow.

[0036] For seeds of different specifications, the position of the rotation of the bean separating plate 9 is changed through the three round holes at the upper end of the bean separating plate 9, so as to change the size of the outlet area of the blanking cavity 5. A small outlet area is suitable for small-sized seeds to prevent serious seed accumulation, and a large outlet area is suitable for large-sized seeds.

[0037] The air exchange plate 15 can prevent the inside of the working chamber 36 from being in a vacuum state, thus preventing the situation where seeding cannot be carried out due to the vacuum state. The brush groove 35 can prevent the brush 34 from interfering with the housing I 2, enabling the brush 34 to pass through smoothly and avoiding damage to the brush 34. The hard brush 34 is strong and durable, which can extend the service life of the brush 34. At the same time, the brush 34 does not damage the germ of the seeds during the working process, and can maintain the integrity of the seeds. When the snap ring 38 is loosened, the discharge door 28 can be turned up and opened for discharging. When the observation window 40 is opened, the internal situation of the working chamber 36 can be observed.

Claims

1. An air suction seed metering device, comprising an outer shell (1), characterized in that: The outer shell (1) further comprises a shell I (2) and a shell II (3), one side of the shell I (2) is hinged to one side of the shell II (3), the shell I (2) and the shell II (3) can be locked after being closed, and a feed port (4) is provided at the top of the shell I (2); a partition I (30) and a partition II (31) are provided inside the shell I (2), the partition I (30) and the partition II (31) are curved integral structures, the height of the partition I (30) is higher than the height of the partition II (31); one side of the partition I (30) and the partition II (31) is a working chamber (36 ), the other side of the partition I (30) and the partition II (31) is a lower seed cavity (8), and the lower seed cavity (8) is connected to the working cavity (36) at the position of the partition II (31); a central cavity (6) is provided at the center of the shell I (2), and the central cavity (6) is located in the working cavity (36). A bolt (7) is installed in the central cavity (6), and the width of the central cavity (6) is consistent with the width of the partition I (30); on one side of the central cavity (6), a blanking cavity (5) is provided in the shell I (2), and the blanking cavity (5) is connected to the feed port (4) and the working cavity (36); A scraper scale plate (12) and a limit plate (13) are provided on the housing I (2) at an upper position on one side of the blanking cavity (5); the scraper scale plate (12) is located above the limit plate (13); a scraper A (10) is provided between the scraper scale plate (12) and the limit plate (13); the front and back sides of the scraper A (10), the scraper scale plate (12) and the limit plate (13) are jointly provided with a clamping plate (16); the front and back clamping plates (16) and the scraper scale plate (12) and the limit plate (13) are fixed to the housing I (2); In the working chamber (36) on one side of the scraper scale plate (12), a positioning seat (20) is fixed on the housing I (2), and an L-shaped scraper B (11) arranged obliquely is hinged in the positioning seat (20); a circular seeding disc (32) is installed on the regular hexagonal end of the bolt (7), and a regular hexagonal limiting hole (37) is provided at the center of the seeding disc (32), and the limiting hole (37) cooperates with the regular hexagonal end of the bolt (7) to penetrate, and the back plate body of the seeding disc (32) is in contact with the front side of the outer wall of the central cavity (6) and the front side of the partition I (30), and a circle of uniformly spaced seeding holes (33) is provided at the edge of the seeding disc (32) in the circumferential direction, and a plurality of uniformly spaced arc-shaped segmented brushes (34) are installed on the back side of the seeding disc (32) on the inner side of the circle of seeding holes (33), and the brushes (34) are hard brushes; A negative pressure tube (23) is provided outside the shell II (3), and an arc-shaped vacuum chamber (22) is provided inside the shell II (3). The vacuum chamber (22) is communicated with the negative pressure tube (23), and a sealing ring is provided around the vacuum chamber (22). A circular groove-shaped positioning cover (21) is provided at the center of the shell II (3). The positioning cover (21) can fit with the front plate body of the seeding plate (32), and the regular hexagonal end of the bolt (7) is located in the positioning cover (21). Below the feed port (4), a gear box (25) is provided outside the housing I (2), a transmission shaft (29) is provided on one side of the gear box (25), a gear a (26) and a gear b (27) are provided inside the gear box (25), both the gear a (26) and the gear b (27) are bevel gears, the two gears are meshed and connected, the axle of the gear b (27) is coaxial with the transmission shaft (29), and the axle of the gear a (26) is coaxial with the bolt (7).

2. The air suction seed metering device according to claim 1, characterized in that: A positioning hook a (14) is installed on the scraper A (10). The end of the positioning hook a (14) is hinged with the clamping plate (16) and the limit plate (13). The main body of the positioning hook a (14) is in close contact with the front of the scraper scale plate (12). The positioning hook a (14) can rotate around the hinge point. Above the hinge point, the positioning hook a (14) is hinged with one end of the connecting plate (41). The other end of the connecting plate (41) is fixed to the scraper A (10). The scraper A (10) can move between the scraper scale plate (12) and the limit plate (13). The upper end of the plate body of the scraper scale plate (12) is provided with a plurality of positioning holes A (18) that are evenly spaced and arranged in an arc shape. Corresponding numbers are provided below the positioning holes A (18). The numbers are arranged in order from small to large from left to right. The hook body of the positioning hook a (14) is inserted into one of the positioning holes A (18).

3. The air suction seed metering device according to claim 1 or 2, characterized in that: The upper end of the scraper B (11) is hinged to the handle of the positioning hook b (17), the positioning hook b (17) is located on the back of the scraper scale plate (12), and the main body of the positioning hook b (17) is in close contact with the back of the scraper scale plate (12); below the positioning hole A (18), a plurality of positioning holes B (19) are arranged at an edge of the plate body of the scraper scale plate (12) at even intervals and in a vertical direction, and corresponding numbers are arranged on one side of the positioning hole B (19), and the numbers are arranged in order from small to large from top to bottom. The positioning hole B (19) is a waist-shaped hole, and the hook body of the positioning hook b (17) is inserted into one of the positioning holes B (19).

4. The air suction seed metering device according to claim 1, characterized in that: At the outlet of the material-dropping cavity (5), a bean-distributing plate (9) is provided inside the shell body I (2), and three spaced circular holes are provided in the upper plate body of the bean-distributing plate (9), one of the circular holes being fixedly connected to the inside of the shell body I (2) by bolts, and the lower end of the bean-distributing plate (9) is hinged to the inside of the shell body I (2).

5. The air suction seed metering device according to claim 1, characterized in that: A transparent ventilation plate (15) is fixedly mounted on the housing I (2) on the front side of the positioning seat (20).

6. The air suction seed metering device according to claim 1, characterized in that: On the side close to the hinge between the shell I (2) and the shell II (3), the end position of the vacuum chamber (22) is a wind stop node (24).

7. The air suction seed metering device according to claim 1, characterized in that: On one side of the outlet of the seed lower chamber (8), the housing I (2) is provided with an arc-shaped brush groove (35).

8. The air suction seed metering device according to claim 1, characterized in that: On one side of the gear box (25), a reversible discharge door (28) is installed on the outside of the housing I (2), and a clamping ring (38) is hinged on the discharge door (28). On the side where the housing I (2) and the housing II (3) are locked, a bent clamping plate (39) is fixed to the side of the housing I (2), and the clamping ring (38) can tightly clamp the clamping plate (39); above the clamping plate (39), a rotatable observation window (40) is installed on the housing I (2).

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