Suction support type high-speed precise pneumatic seed-metering device

Abstract

The invention relates to a suction support type high-speed precise pneumatic seed-metering device which comprises a seed-metering device shell, an air chamber shell, a seed-metering air chamber, a suction support type seed-metering disc, a main shaft and a seed-filling adjusting plate, the seed-metering device shell and the air chamber shell are fixedly connected through a bolt, and the main shaft is rotationally arranged on the air chamber shell along the axis; a feeding port, a seed discharging port and a seed falling port are respectively formed in the seed metering device shell, a seed metering air chamber is formed in the inner side of the air chamber shell, a seed filling adjusting plate is detachably arranged at the feeding port of an inner cavity of the seed metering device shell, a suction support type seed metering disc is detachably arranged in the inner cavity of the air chamber shell, and the suction support type seed metering disc is detachably arranged in the air chamber shell. The suction and support combined type seed-metering disc is adopted, a disturbance increasing and filling assisting structure is provided, and when precise crop seeding is carried out, high-speed seeding is achieved, the suction leakage rate of seeds is effectively reduced, the seed filling qualification rate of the seeds under the high-speed seeding condition is remarkably improved, and the seed breakage rate is reduced. The suction and support combined type seed-metering disc has the advantages that the suction and support combined type seed-metering disc has the advantages that the suction and support combined type seed-metering disc is adopted, and the disturbance increasing and filling assisting structure is provided;

Description

Technical Field

[0001] This invention relates to the field of seeder technology, specifically to a suction-type high-speed precision pneumatic seed metering device. Background Technology

[0002] Rapeseed, corn, soybeans, and other crops are widely cultivated in my country. However, traditional planting methods suffer from drawbacks such as high labor input, numerous operational procedures, low production efficiency, and significant seed waste. Therefore, mechanization of planting is crucial for improving the overall efficiency of crops.

[0003] As a core component in mechanized crop sowing, seed meters in my country are currently mainly mechanical and pneumatic. However, traditional mechanical seed meters suffer from seed breakage and slow sowing speeds. Pneumatic seed meters, on the other hand, offer significant advantages over traditional seed meters, including greater adaptability and lower breakage rates. Air-suction seed meters, a key piece of equipment for precision sowing, work by using a fan to generate negative pressure, creating a vacuum chamber on one side of the seed metering disc. As the disc rotates, the suction holes on the disc surface adsorb individual seeds in the filling zone due to the air pressure difference. The seeds are then carried to the seeding zone, where they are detached and fall into the seed furrow under the action of negative pressure or positive pressure airflow. This pneumatic seed-taking method offers significant advantages over mechanical seed meters, including lower seed damage, faster operation, and better adaptability to seed shape.

[0004] However, traditional air-suction seed metering devices still face a series of technical challenges when confronted with increasingly demanding requirements for high-speed and high-precision sowing. As the speed of the seed metering device increases, the residence time of seeds in the seed filling zone is significantly shortened. Relying solely on gravity filling makes it difficult to ensure effective contact between the seed suction hole and the seed, easily leading to an increased rate of missed seeding and affecting the uniformity of seedling emergence. Furthermore, the smooth surfaces of seeds such as rapeseed, corn, and soybeans make them more prone to premature detachment from the seed suction hole under the centrifugal force generated by high-speed rotation, further increasing the uncertainty of the seed metering process. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a suction-type high-speed precision pneumatic seed metering device that can reduce seed leakage rate and improve sowing efficiency.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A high-speed precision pneumatic seed metering device with suction and support includes a seed metering device housing, an air chamber housing, a seed metering air chamber, a suction and support seed metering disc, a drive shaft, and a seed filling adjustment plate. The air chamber housing has a seed metering air chamber on its inner side. The suction and support seed metering disc includes an annular tray and a suction cup. The suction cup is installed outside the seed metering air chamber and closes it. The cavity formed between the suction cup and the seed metering device housing is a seed filling chamber. The side of the suction cup facing the seed filling chamber is the seed suction surface. The annular tray is fixedly mounted on the seed suction surface of the suction cup. A ring of seed suction holes is formed around the axis on the suction cup. The drive shaft is used to drive the suction and support seed metering disc to rotate. The seed metering air chamber includes a positive pressure air chamber and a negative pressure air chamber. When the suction cup rotates, the seed suction holes can pass through the negative pressure air chamber and the positive pressure air chamber in a cyclical sequence. A ring of support teeth is provided on the inner ring surface of the annular tray. The support teeth are located outside the seed suction holes and correspond one-to-one with the seed suction holes.

[0008] The distance from the outer contour curve of the tooth to the center of the seed suction hole is L. The equation of the outer contour curve of the tooth and the calculation formula for the range of values ​​of the center distance L are as follows:

[0009] L = 0.5D ~ 0.6D

[0010] Where L is the distance from the outer contour curve to the center of the seed suction port, in mm; D is the average seed diameter, in mm;

[0011] The direction of the tooth curve of the annular tray starts at a point L away from the center of the suction hole, 90 degrees clockwise from the suction hole corresponding to a single tooth. The curve is selected from the Fibonacci sequence from x to x. 2 The formula for calculating the outer contour curve of a single tooth, corresponding to the Fibonacci curve segment +x, is as follows:

[0012] A (x) =x 2 +x

[0013] x = f(L)

[0014] f(L)=[L)

[0015] A is the radius of the next circle when drawing the outer contour curve of a single tooth, x is the radius when drawing the outer contour curve of a single tooth, and f(L) is the largest positive integer less than L.

[0016] The seed metering device has a movable seed filling adjustment plate at the inlet of the housing, which can adjust the seed filling height according to different crops.

[0017] Furthermore, a drive shaft is rotatably provided on the air chamber housing along the axis, and the seed metering device housing and the air chamber housing are fixedly connected by bolts. The seed metering device housing is provided with a feed inlet, a seed discharge inlet and a seed drop inlet respectively.

[0018] After the seeds enter the inner cavity of the seed metering device housing through the inlet, the negative pressure air chamber is used to adsorb the seeds onto the suction cup through the seed suction hole, and the drive shaft is used to directionally rotate the suction cup so that the seed suction hole continuously adsorbs seeds.

[0019] The toothed support is used to lift the seeds after they are adsorbed by the seed suction hole. The suction cup is used to move the seed suction hole with seeds adsorbed through the negative pressure air chamber to the positive pressure air chamber. The positive pressure air chamber is used to output positive air pressure to blow the seeds to the seed drop port. The seed drop port is used to drop the seeds onto the cultivated land. The suction cup is also used to move the empty seed suction hole through the negative pressure air chamber to adsorb seeds again. The amount of seeds entering the seed filling chamber from the inlet can be adjusted by adjusting the size of the seed filling adjustment plate installed at the inlet. The seed discharge port is used to remove the remaining seeds inside the seed filling chamber after sowing.

[0020] Furthermore, a seed-blocking plate is provided at the seed-dropping opening, with the top of the seed-blocking plate extending below the seed-suction hole. The seed-blocking plate is used to block any seeds that are adsorbed in the seed-suction hole.

[0021] Furthermore, a straight groove port is provided at the center of the suction cup shaft, and a square end is provided at the output end of the main shaft. The main shaft is inserted into the straight groove port through the square end to fix the suction cup.

[0022] Furthermore, the seed metering chamber has a horseshoe-shaped cavity structure, a sealing gasket is provided between the seed metering chamber and the suction cup, and the periphery of the seed metering chamber is provided with three stepped recessed mounting surfaces, which are respectively used to position and install the seed metering device housing, the suction-type seed metering plate and the sealing gasket.

[0023] Furthermore, the outer contour of the bracket tooth is a Fibonacci curve.

[0024] Furthermore, the seed suction hole is a conical countersunk hole, and the seed suction surface is a countersunk surface.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This invention employs a suction-and-hold combined seed metering tray and proposes a "disturbance-enhanced filling" structure to achieve high-speed seeding during precision crop sowing. Specifically, the tray of the seed metering tray combines a ring and support teeth, with an outwardly protruding installation. When the seed metering tray is operating normally, the tray rotates accordingly. In conjunction with the seed filling adjustment plate, it ensures the seed quantity within the seed metering device's outer shell. During seed metering, the rotating sawtooth-shaped ring tray lifts the seeds and disturbs the seed population. Furthermore, the disturbance of the tray in the seed suction area ensures that the seed population continuously rolls on the support teeth of the tray. Combined with the seed suction holes on the suction cup, each suction hole holds one seed, effectively reducing the seed leakage rate, significantly improving the seed filling qualification rate under high-speed sowing conditions, and reducing the seed breakage rate.

[0027] 2. The suction-and-tray type high-speed precision pneumatic seed metering device of the present invention can adapt to the sowing needs of different types of seeds by changing the suction and tray according to the different seed particle sizes, thereby reducing the development cost of the equipment and the purchase cost for users, and improving the versatility of the seeder. The present invention uses a seed filling adjustment plate, specifically adjusting the seed filling height by adjusting the plate of different sizes, which can ensure that the crop seeds are piled at a suitable seed filling height and ensure the seed filling effect. Attached Figure Description

[0028] Figure 1 Assembly of the present invention Figure 1 ;

[0029] Figure 2 Assembly of the present invention Figure 2 ;

[0030] Figure 3 This is a front view schematic diagram of a suction-type seed metering tray;

[0031] Figure 4 A frontal view of the suction cup;

[0032] Figure 5 This is a frontal view of the tray;

[0033] Figure 6 A frontal view of the internal structure of the air chamber shell;

[0034] Figure 7 A front view of the internal structure of the seed metering device housing.

[0035] Figure 8 A schematic diagram of the main shaft three-dimensional mechanism;

[0036] Figure 9 This is a front view of the sealing gasket;

[0037] Figure 10 A picture of a seed metering device used for sowing rapeseed seeds;

[0038] Figure 11 A picture of a seed metering device used for sowing soybean seeds;

[0039] Figure 12 A picture of a seed metering device used for sowing corn seeds;

[0040] Figure 13 A picture of a seed metering device used for sowing sorghum seeds.

[0041] The attached diagram lists the components represented by each number as follows:

[0042] 1. Seed metering device housing; 2. Air chamber housing; 201. Air chamber fixing threaded hole; 3. Seed metering air chamber; 301. Positive pressure air chamber; 302. Negative pressure air chamber; 4. Drive shaft; 401. Square end; 402. Main shaft threaded hole; 5. Seed filling adjustment plate; 6. Feed inlet; 7. Discharge port; 8. Seed dropping port; 9. Annular tray; 901. Support tooth; 10. Suction cup; 1001. Straight groove port; 11. Seed suction hole; 12. Seed baffle plate; 13. Sealing gasket; 14. Seed discharge cover; 15. Bearing seat flange; 16. Suction-type seed metering tray. Detailed Implementation

[0043] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0044] like Figure 1-9 As shown, a suction-type high-speed precision pneumatic seed metering device includes a seed metering device housing 1, an air chamber housing 2, a seed metering air chamber 3, a suction-type seed metering disc 16, a drive shaft 4, and a seed filling adjustment plate 5. The air chamber housing 2 has a seed metering air chamber 3 inside. The suction-type seed metering disc 16 includes an annular tray 9 and a suction cup 10. The suction cup 10 is installed outside the seed metering air chamber 3 and closes it. The cavity formed between the suction cup 10 and the seed metering device housing 1 is a seed filling chamber. The side of the suction cup 10 facing the seed filling chamber is the seed suction surface. The seed suction surface of the disc 10 is fixedly provided with an annular tray 9. A ring of seed suction holes 11 is opened around the axis on the suction cup 10. The drive shaft 4 is used to drive the suction-type seed metering disc 16 to rotate. The seed metering air chamber 3 includes a positive pressure air chamber 301 and a negative pressure air chamber 302. When the suction cup 10 rotates, the seed suction holes 11 can pass through the negative pressure air chamber 302 and the positive pressure air chamber 301 in a cyclic sequence. A ring of support teeth 901 is provided on the inner ring surface of the annular tray 9. The support teeth 901 are located outside the seed suction holes 11 and correspond one-to-one with the seed suction holes 11.

[0045] The distance from the outer contour curve of the tooth 901 to the center of the seed suction hole 11 is L. The equation of the outer contour curve of the tooth 901 and the calculation formula (1-1) for the range of values ​​of the center distance L are as follows:

[0046] L = 0.5D ~ 0.6D (1-1)

[0047] Where L is the distance from the outer contour curve to the center of the seed suction port, in mm; D is the average seed diameter, in mm;

[0048] The direction of the tooth curve of the annular tray 9 starts at a point L away from the center of the suction hole, 90 degrees clockwise from the suction hole corresponding to a single tooth. The curve is selected from the Fibonacci sequence from x to x. 2The formulas (1-2), (1-3), and (1-4) for calculating the outer contour curve of a single 901 tooth, corresponding to the Fibonacci curve segment +x, are as follows:

[0049] A (x) =x 2 +x (1-2)

[0050] x=f(L) (1-3)

[0051] f(L)=[L] (1-4)

[0052] A is the radius of the next circle when drawing the outer contour curve of a single tooth 901, x is the radius when drawing the outer contour curve of a single tooth 901, and f(L) is the largest positive integer less than L.

[0053] The seed metering device housing 1 has a movable seed filling adjustment plate 5 at the inlet 6 inside the housing, which can adjust the seed filling height according to different crops.

[0054] In one embodiment, a drive shaft 4 is rotatably provided on the air chamber housing 2 along the axis, and the seed metering housing 1 and the air chamber housing 2 are fixedly connected by bolts. The seed metering housing 1 is provided with a feed inlet 6, a seed discharge inlet 7 and a seed drop inlet 8.

[0055] After the seeds enter the inner cavity of the seed metering device housing 1 through the feed inlet 6, the negative pressure air chamber 302 is used to adsorb the seeds onto the suction cup 10 through the seed suction hole 11, and the drive shaft 4 is used to directionally rotate the suction cup 10 so that the seed suction hole 11 continuously adsorbs seeds.

[0056] The tooth 901 is used to lift the seeds after they are adsorbed by the seed suction hole 11. The suction cup 10 is used to move the seed suction hole 11 with seeds adsorbed through the negative pressure air chamber 302 to the positive pressure air chamber 301. The positive pressure air chamber 301 is used to output positive air pressure to blow the seeds to the seed drop port 8. The seed drop port 8 is used to place the seeds on the cultivated land. The suction cup 10 is also used to move the empty seed suction hole 11 through the negative pressure air chamber 302 again to adsorb seeds. The amount of seeds entering the seed filling chamber from the inlet 6 can be adjusted by adjusting the size of the seed filling adjustment plate 5 installed at the inlet 6. The seed discharge port 7 is used to remove the remaining seeds inside the seed filling chamber after sowing.

[0057] Specifically, the seed metering device housing 1 is convex straight groove, which can further constrain the seed metering disc. The seed metering device housing 1 and the air chamber housing 2 are fixedly connected by bolts. The bottom of the air chamber housing 2 is provided with an air chamber fixing threaded hole 201. The entire seed metering device is installed on the seed metering frame of the seeder through the air chamber fixing threaded hole 201 and bolts. The seed discharge port 7 is provided with a seed discharge cover 14, which is a silicone soft cover. Both the positive pressure air chamber 301 and the negative pressure air chamber 302 are equipped with auxiliary air inlet pipes. The center of the seed metering air chamber 3 has a bearing seat flange 15 fixed by bolts. The drive shaft 4 is fixed inside the bearing seat flange 15 by bearing cooperation.

[0058] In one embodiment, a seed-blocking plate 12 is provided at the seed-dropping port 8, with the top of the seed-blocking plate 12 extending below the seed-suction hole 11. The seed-blocking plate 12 is used to block the seeds that are adsorbed in the seed-suction hole 11.

[0059] In one embodiment, a straight groove port 1001 is provided at the axis of the suction cup 10, and a square end 401 is provided at the output end of the drive shaft 4. The drive shaft 4 is inserted into the straight groove port 1001 through the square end 401 to fix the suction cup 10.

[0060] Specifically, the suction cup 10 has a fixing hole, and the tray 9 is fixed to the suction cup 10 by a fixing pin that cooperates with the fixing hole;

[0061] The output end of the drive shaft 4 is provided with a drive shaft threaded hole 402. The drive shaft threaded hole 402 is connected to a screw and a washer. The suction cup 10 is fixed by inserting it into the fixing hole of the suction cup 10 through the straight slot port 1001. The input end of the drive shaft 4 is provided with a hexagonal port for power input.

[0062] In one embodiment, the seed metering chamber 3 has a horseshoe-shaped cavity structure, and a sealing gasket 13 is provided between the seed metering chamber 3 and the suction cup 10. The periphery of the seed metering chamber 3 is provided with three stepped recessed mounting surfaces, which are used to position and install the seed metering device housing 1, the suction-type seed metering plate 16 and the sealing gasket 13, respectively.

[0063] In one embodiment, the outer contour of the bracket 901 is a Fibonacci curve.

[0064] In one embodiment, the seed suction hole 11 is a conical countersunk hole, and the seed suction surface is a countersunk surface.

[0065] The method of using this invention is as follows:

[0066] Taking rapeseed sowing as an example:

[0067] An 80-type perforated seed metering disc is selected, with a suction hole diameter of 1mm, a chamfer size of 1mm, and an angle of 45°. The tray tooth curve is selected from the Fibonacci curve radius range of 1-2mm, and the distance from the starting point of the curve to the center of the suction hole 11 is 1.2mm. For high-speed rapeseed sowing, the suction-type pneumatic seed metering device is installed on the seed metering beam at the rear of the seeder using bolts through the threaded hole 201 in the air chamber. Power is provided by the seeder's motor, and the power is transmitted to the seed metering device drive shaft 4 through the output shaft. The working rotation direction of the suction cup 10 and the tray 9 is consistent with the forward direction of the tractor.

[0068] During the operation, the implement is pulled forward by a tractor. Rapeseed seeds enter the seed filling chamber through the feed inlet 6, and the seed filling adjustment plate 5 controls the height of the rapeseed seeds inside the seed filling chamber. As the fan and motor start, the fan starts working 1 second before the motor. The fan outlet is connected to the auxiliary air intake pipe of the positive pressure air chamber 301 and the auxiliary air intake pipe of the negative pressure air chamber 302 on the seed dispensing air chamber 3, respectively, to ensure a stable output of positive and negative pressure airflow from the seed metering device. As the drive shaft 4 of the seed metering device rotates, the rapeseed seeds are steadily sucked up by the suction cup 10 under the support of the tray 9. When passing through the seed baffle 12, the rapeseed seeds that may be sucked up again are blocked. The rapeseed seeds are transported from the negative pressure air chamber 302 to the positive pressure air chamber 301 by the suction cup 10. The rapeseed seeds are then sown from the seed drop pipe, and the entire seed filling process is completed. After the sowing work is completed, the excess rapeseed seeds can be unloaded through the seed discharge port 7, and the sowing task is completed.

[0069] When sowing soybeans, select a suction tray with 30 suction holes, each with a diameter of 3mm, a chamfer of 2mm, and an angle of 45 degrees. 0 The tray tooth curve is selected from the Fibonacci curve with a radius of 3-5mm, and the starting point of the curve is 3.6mm from the center of the seed suction hole 11. When sowing corn, a seed metering tray with 30 seed suction holes is selected, with a suction hole diameter of 3mm, a chamfer size of 2mm, and an angle of 45 degrees. 0 The tray tooth curve is selected from the Fibonacci curve with a radius of 5-8mm, and the starting point of the curve is 5.5mm from the center of the seed suction hole 11. When sowing sorghum, a seed metering tray with 70mm seed suction holes is selected, with a suction hole diameter of 1mm, a chamfer size of 2mm, and an angle of 45°. 0 The tray tooth curve is selected from the Fibonacci curve radius range of 1-2mm, and the starting point of the curve is 1.8mm away from the center of the seed suction hole 11.

[0070] When changing to different crop seeds for sowing, the seed metering device housing, screws, and washers can be removed to replace the tray and suction cup. Replace them with suction cups and trays that correspond to the size of the crop seeds. At the same time, replace the seed filling adjustment plate to ensure that the seed population is at the optimal filling height when different seeds are being filled, thereby fulfilling the sowing requirements of different crops.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A suction-type high-speed precision pneumatic seed metering device, characterized in that, The device includes a seed metering device housing (1), an air chamber housing (2), a seed metering air chamber (3), a suction-type seed metering disc (16), a drive shaft (4), and a seed filling adjustment plate (5). The air chamber housing (2) has a seed metering air chamber (3) inside. The suction-type seed metering disc (16) includes an annular tray (9) and a suction cup (10). The suction cup (10) is installed outside the seed metering air chamber (3) and closes the seed metering air chamber (3). The cavity formed between the suction cup (10) and the seed metering device housing (1) is a seed filling chamber. The side of the suction cup (10) facing the seed filling chamber is the seed suction surface. The seed suction surface of the suction cup (10) is fixed. A ring tray (9) is provided, and a ring of seed suction holes (11) is opened around the axis on the suction cup (10). The drive shaft (4) is used to drive the suction-type seed metering tray (16) to rotate. The seed metering air chamber (3) includes a positive pressure air chamber (301) and a negative pressure air chamber (302). When the suction cup (10) rotates, the seed suction holes (11) can pass through the negative pressure air chamber (302) and the positive pressure air chamber (301) in a cyclic sequence. A ring of support teeth (901) is provided on the inner ring surface of the ring tray (9). The support teeth (901) are located outside the seed suction holes (11) and correspond one-to-one with the seed suction holes (11). The distance from the outer contour curve of the tooth (901) to the center of the seed suction hole (11) is L. The equation of the outer contour curve of the tooth (901) and the calculation formula for the range of values ​​of the center distance L are as follows: L = 0.5D ~ 0.6D Where L is the distance from the outer contour curve to the center of the seed suction port, in mm; D is the average seed diameter, in mm; The direction of the tooth curve of the annular tray (9) starts at a point L away from the center of the suction hole, 90 degrees clockwise from the suction hole corresponding to a single tooth. The curve is selected from the Fibonacci sequence from x to x. 2 The formula for calculating the outer contour curve of a single tooth (901) corresponding to the Fibonacci curve segment +x is as follows: A (x) =x 2 +x x = f(L) f(L)=[L) A is the radius of the next circle when drawing the outer contour curve of a single tooth (901), x is the radius when drawing the outer contour curve of a single tooth (901), and f(L) is the largest positive integer less than L. The seed metering device housing (1) has a seed filling adjustment plate (5) that can be movably installed at the inlet (6) of the inner cavity, which can adjust the seed filling height according to different crops.

2. The suction-type high-speed precision pneumatic seed metering device according to claim 1, characterized in that, A drive shaft (4) is rotatably provided on the air chamber housing (2) along the axis. The seed metering housing (1) and the air chamber housing (2) are fixedly connected by bolts. The seed metering housing (1) is provided with a feed inlet (6), a seed discharge inlet (7) and a seed drop inlet (8). After the seeds enter the inner cavity of the seed metering device housing (1) through the feed inlet (6), the negative pressure air chamber (302) is used to adsorb the seeds onto the suction cup (10) through the seed suction hole (11), and the drive shaft (4) is used to rotate the suction cup (10) in a directional manner so that the seed suction hole (11) continuously adsorbs seeds. The toothed teeth (901) are used to lift the seeds after they are adsorbed by the seed suction hole (11). The suction cup (10) is used to move the seed suction hole (11) with seeds adsorbed through the negative pressure air chamber (302) to the positive pressure air chamber (301). The positive pressure air chamber (301) is used to output positive air pressure to blow the seeds to the seed drop port (8). The seed drop port (8) is used to place the seeds on the cultivated land. The suction cup (10) is also used to move the empty seed suction hole (11) through the negative pressure air chamber (302) again to adsorb the seeds. The amount of seeds entering the seed filling chamber from the inlet (6) can be adjusted by adjusting the size of the seed filling adjustment plate (5) installed at the inlet (6). The seed discharge port (7) is used to remove the remaining seeds inside the seed filling chamber after sowing.

3. The suction-type high-speed precision pneumatic seed metering device according to claim 2, characterized in that, A seed-blocking plate (12) is provided at the seed-dropping opening (8). The top of the seed-blocking plate (12) extends below the seed-suction hole (11). The seed-blocking plate (12) is used to block the seeds that are adsorbed in the seed-suction hole (11).

4. The suction-type high-speed precision pneumatic seed metering device according to claim 2, characterized in that, The suction cup (10) has a straight groove port (1001) at its axis, and the output end of the drive shaft (4) is provided with a square end (401). The main shaft (4) inserts the square end (401) into the straight groove port (1001) to fix the suction cup (10).

5. A suction-type high-speed precision pneumatic seed metering device according to claim 2, characterized in that, The seed metering air chamber (3) has a horseshoe-shaped cavity structure. A sealing gasket (13) is provided between the seed metering air chamber (3) and the suction cup (10). The seed metering air chamber (3) has three stepped recessed mounting surfaces around its periphery, which are used to position and install the seed metering device housing (1), the suction-type seed metering plate (16), and the sealing gasket (13), respectively.

6. A suction-type high-speed precision pneumatic seed metering device according to claim 2, characterized in that, The outer contour of the bracket (901) is a Fibonacci curve.

7. A suction-type high-speed precision pneumatic seed metering device according to claim 2, characterized in that, The seed suction hole (11) is a conical countersunk hole, and the seed suction surface is a countersunk surface.

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