Corn narrow-row double-seedling-zone delta-shaped close planting high-speed precision seed metering device and seed metering method

Abstract

The invention discloses a corn narrow-row double-seedling-zone delta-shaped close planting high-speed precision seed-metering device and a seed-metering method, relates to the technical field of agricultural machinery, and solves the problem of poor seed-metering uniformity during high-speed operation of a precision seed-metering device in a corn wide-row and narrow-row delta-shaped close planting mode. A first cavity structure and a second cavity structure are arranged in the shell; the first seed cleaning device, the first seed metering disc and the first pressure relief wheel are positioned in the first cavity structure; the second seed metering disc, the second seed cleaning device and the second pressure relief wheel are positioned in the second cavity structure; the plurality of holes in the first seed-metering disc and the plurality of holes in the second seed-metering disc are arranged in a staggered manner; according to the invention, the seed-metering devices are arranged in a bilateral symmetry manner, delta-shaped seeding is realized through the two staggered seed trays, the seed cleaning device capable of adjusting the seed cleaning angle is matched to adapt to corn seeds of different shapes and types and working conditions, the overall integration degree is high, the structure is compact, and the high-speed operation requirement of corn narrow-row double-seedling-zone delta-shaped close planting is met.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and in particular, to a high-speed precision seed metering device and a seed metering method for narrow-row double-seedling-zone diamond-shaped close planting of corn. Background Art

[0002] Corn is one of the most widely planted and highest-yielding food crops worldwide, and its stable production is crucial for maintaining food security and the sustainable development of agriculture. Advanced planting patterns and their supporting high-speed seeding machines are important means to increase the yield per unit area of corn. However, close planting and high-speed seeding operations pose higher requirements for the mechanical stability and reliability of seeding machines, increasing the design difficulty and complexity of seeding machines, resulting in poor seed metering uniformity during high-speed operation of the precision seed metering device in the narrow-row and wide-row diamond-shaped close planting mode of corn. Summary of the Invention

[0003] Aiming at the problem of poor seed metering uniformity during high-speed operation of the precision seed metering device in the narrow-row and wide-row diamond-shaped close planting mode of corn, the purpose of the present invention is to provide a high-speed precision seed metering device and a seed metering method for narrow-row double-seedling-zone diamond-shaped close planting of corn. By adopting a seed metering device structure with a left-right symmetrical layout and staggered seed metering disks, based on the pneumatic principle, seeds are pressed onto the seed disk under the action of the pressure difference inside and outside the orifice, and are quickly sown under the action of high-speed positive pressure air flow in the seed outlet pipe, realizing high-speed operation conditions for narrow-row double-seedling-zone diamond-shaped close planting of corn.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A high-speed precision seed metering device for narrow-row double-seedling-zone diamond-shaped close planting of corn, including: a housing, wherein a first cavity structure and a second cavity structure are arranged inside the housing; a seed inlet pipe 17 and a ventilation duct 13 communicating with the outside are arranged on the housing; and a seed outlet pipe 16 communicating with the outside is respectively arranged inside the first cavity structure and the second cavity structure;

[0006] It further includes: a motor 2, a first seed cleaning device 5, a first seed metering disc 6, a pressure relief wheel connecting frame 8, a second seed metering disc 10, a second seed cleaning device 11, a first pressure relief wheel 27 and a second pressure relief wheel 28. The pressure relief wheel connecting frame 8 is installed inside the housing; the second seed metering disc 10 is sleeved on the pressure relief wheel connecting frame 8, the first seed metering disc 6 and the second seed metering disc 10 are connected to each other. The motor 2 is used to drive the first seed metering disc 6 and the second seed metering disc 10 to rotate synchronously around the axis of the pressure relief wheel connecting frame 8; a plurality of mold holes 23 on the first seed metering disc 6 and a plurality of mold holes 23 on the second seed metering disc 10 are arranged staggeredly; the first pressure relief wheel 27 and the second pressure relief wheel 28 are both installed on the pressure relief wheel connecting frame 8; the first pressure relief wheel 27 is located inside the first seed metering disc 6 and above the end of the seed outlet pipe 16 in the first cavity structure; the second pressure relief wheel 28 is located inside the second seed metering disc 10 and above the end of the seed outlet pipe 16 in the second cavity structure; the first seed cleaning device 5 is installed inside the housing and between the seed inlet pipe 17 and the seed outlet pipe 16 in the first cavity structure; the second seed cleaning device 11 is installed inside the housing and between the seed inlet pipe 17 and the seed outlet pipe 16 in the second cavity structure.

[0007] For the above-mentioned corn narrow-row double-seedling belt pyramid-shaped dense planting high-speed precision seed metering device, wherein, the housing includes: a first housing 1, a sealing ring 4, a connecting plate 9 and a second housing 12. The first housing 1 and the second housing 12 are respectively installed on the left and right sides of the connecting plate 9; a sealing ring 4 is assembled between the first housing 1 and the connecting plate 9; a sealing ring 4 is assembled between the second housing 12 and the connecting plate 9; the first housing 1 and the connecting plate 9 enclose a first cavity structure, and the second housing 12 and the connecting plate 9 enclose a second cavity structure.

[0008] For the above-mentioned corn narrow-row double-seedling belt pyramid-shaped dense planting high-speed precision seed metering device, wherein, it further includes: a first flange 7 and a second flange 15. The second seed metering disc 10 is rotatably installed on the pressure relief wheel connecting frame 8 through the second flange 15. The first flange 7 is installed in the middle of the first seed metering disc 6, and the output main shaft of the motor 2 is connected to the first flange 7.

[0009] For the above-mentioned corn narrow-row double-seedling belt pyramid-shaped dense planting high-speed precision seed metering device, wherein, the first housing 1 is provided with a motor empty slot 19, and the motor 2 is installed in the motor empty slot 19; the pressure relief wheel connecting frame 8 is installed on the second housing 12, and the ventilation duct 13 is installed on the second housing 12 and is communicated with the pressure relief wheel connecting frame 8.

[0010] For the above-mentioned corn narrow-row double-seedling belt pyramid-shaped dense planting high-speed precision seed metering device, wherein, it further includes: a seed blocking net 14 and a diversion plate 18. The seed blocking net 14 is installed inside the housing and above the end of the seed inlet pipe 17; the diversion plate 18 is installed inside the housing and below the end of the seed inlet pipe 17.

[0011] The above-mentioned narrow-row double-seedling-zone staggered dense planting high-speed precise metering seeder for corn, further comprising: a seed baffle 3, two seed baffles 3 are both installed in the housing and symmetrically arranged left and right, the two seed baffles 3 are respectively arranged on the outer peripheries of the first seed metering disc 6 and the second seed metering disc 10, and the clearance dimension between the inner edge of the seed baffle 3 and the outer edge of the first seed metering disc 6 or the second seed metering disc 10 is smaller than the size of the seeds.

[0012] The above-mentioned narrow-row double-seedling-zone staggered dense planting high-speed precise metering seeder for corn, wherein the number of the shaped holes 23 on the first seed metering disc 6 and the second seed metering disc 10 is the same; a plurality of the shaped holes 23 on the first seed metering disc 6 or the second seed metering disc 10 are arranged at equal angles in the circumferential direction; any one of the shaped holes 23 on the first seed metering disc 6 and the plane where its axis is located are between two adjacent shaped holes 23 on the second seed metering disc 10, and pass through the angular bisector formed by the connection lines of the above two shaped holes 23 and any point on their axes; a plurality of grooves 22 are formed on the outer walls of the first seed metering disc 6 and the second seed metering disc 10, and any one of the grooves 22 is located in the middle of two adjacent shaped holes 23; a plurality of the grooves 22 on the first seed metering disc 6 or the second seed metering disc 10 are arranged at equal angles in the circumferential direction.

[0013] The above-mentioned narrow-row double-seedling-zone staggered dense planting high-speed precise metering seeder for corn, wherein the first seed cleaning device 5 and the second seed cleaning device 11 have the same structure, both comprising: a first seed cleaning knife 24, a second seed cleaning knife 25, a third seed cleaning knife 26, a seed cleaning knife fixing frame 29, a base 30, a seed cleaning device adjusting mechanism 31 and an arc-shaped frame 32, the first seed cleaning knife 24, the second seed cleaning knife 25 and the third seed cleaning knife 26 are respectively installed at the seed cleaning end of the arc-shaped frame 32 through a seed cleaning knife fixing frame 29, a seed cleaning device positioning hole 20 is arranged at the positioning end of the arc-shaped frame 32, and a base 30 and a seed cleaning device adjusting mechanism 31 are further installed at the seed cleaning end of the arc-shaped frame 32;

[0014] The arc-shaped frame 32 is rotatably installed on the first housing 1 or the second housing 12 through the positioning hole 20, and the arc-shaped frame 32 is slidably installed in a chute on the first housing 1 or the second housing 12 through the seed cleaning device adjusting mechanism 31;

[0015] The distances between the first seed cleaning knife 24, the second seed cleaning knife 25, the third seed cleaning knife 26 and the axis of the first seed metering disc 6 / the second seed metering disc 10 decrease in sequence.

[0016] A seeding method for a high-speed precise seeder with a narrow-row double-seedling-zone and a staggered planting pattern for corn, which is applicable to the above-mentioned high-speed precise seeder with a narrow-row double-seedling-zone and a staggered planting pattern for corn. The working process is as follows: When the seeder is operating, corn seeds flow into the seeder through the seed inlet pipe 17 under the action of positive-pressure air flow and their own gravity, and are diverted by the guide plate 18 on the housing into the first cavity structure and the second cavity structure and stay therein waiting for seeding; at this time, the group of corn seeds to be seeded in the first cavity structure and the second cavity structure is in a disturbed state under the action of the air flow and the groove 22 between the orifices 23; when the group of seeds to be seeded in the first cavity structure and the second cavity structure reaches a certain seeding height, the motor 2 drives the first seed plate 6 and the second seed plate 10 to rotate, and the corn seeds are entrained by the air flow and pressed onto the surface of the orifices 23 on the first seed plate 6 or the second seed plate 10 and rotate with the first seed plate 6 or the second seed plate 10; after the corn seeds enter the seed cleaning operation range of the first seed cleaning device 5 or the second seed cleaning device 11, the first seed cleaning device 5 or the second seed cleaning device 11 will clean the excess seeds pressed on the orifices 23, leaving only single seeds on their surfaces; subsequently, the seeds in a single-seed state on the orifices 23 rotate with the first seed plate 6 or the second seed plate 10 to the seed discharging point 21, and the first pressure relief wheel 27 or the second pressure relief wheel 28 blocks the inside of the orifices 23 corresponding to the seed discharging point 21, the pressure difference inside and outside the orifices 23 disappears, the corn seeds lose the air flow pressing force, and are separated from the seeder through the seed outlet pipe 16 under the action of the positive-pressure air flow, completing the seeding process.

[0017] Due to the adoption of the above technology, the positive effects of the present invention compared with the prior art are:

[0018] (1) Based on the pneumatic principle, the present invention can not only reduce the damage to seeds compared with mechanical seeders, but also be more suitable for high-speed seeding operations. During the seeding process, the cooperation of the air flow and the groove can enhance the disturbance of the corn seed group in the chamber, improve the seeding performance. The seed cleaning device can be adjusted by the adjustment mechanism for the seed cleaning angle, which can adapt to the seed cleaning operations under different shapes and working conditions. The structure of the seeder is relatively compact, reducing energy consumption and wind pressure loss, improving the seeding efficiency, and meeting the agronomic requirements of the narrow-row double-seedling-zone and staggered planting pattern for corn.

[0019] (2) In the present invention, the seeder presents a left-right symmetric layout, realizes staggered planting through two staggered seed plates, and cooperates with the seed cleaning device with an adjustable seed cleaning angle to adapt to different shapes of corn seeds and working conditions. The overall integration degree is high, the structure is compact, and compared with the traditional pneumatic seeder, it reduces energy consumption and wind pressure loss, meeting the requirements of high-speed operation for the narrow-row double-seedling-zone and staggered planting pattern for corn. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a high-speed precise seeder with a narrow-row double-seedling-zone and a staggered planting pattern for corn according to the present invention.

[0021] Figure 2 It is an exploded view of the overall structure of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0022] Figure 3 It is an internal schematic diagram of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0023] Figure 4 It is an assembly schematic diagram of the seed metering disc, flange, pressure relief wheel and its connecting frame of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0024] Figure 5 It is an assembly schematic diagram of the seed metering disc and the seed cleaning device of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0025] Figure 6 It is a structural schematic diagram of the seed metering disc of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0026] Figure 7 It is a cross-sectional view of the seed metering disc of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0027] Figure 8 It is a structural schematic diagram of the first housing of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0028] Figure 9 It is a structural schematic diagram of the second housing of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0029] Figure 10 It is a structural schematic diagram of the seed baffle of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0030] Figure 11 It is a structural schematic diagram of the seed blocking net of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0031] Figure 12 It is a structural schematic diagram of the seed cleaning device of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0032] Figure 13 It is a structural schematic diagram of the sealing ring of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0033] Figure 14 It is a structural schematic diagram of the connecting plate of a high-speed precise seed metering device with a narrow-row double-seedling belt and a pyramid-shaped dense planting for corn in the present invention.

[0034] In the accompanying drawings: 1. First housing; 2. Motor; 3. Seed blocking plate; 4. Sealing ring; 5. First seed cleaning device; 6. First seed metering disc; 7. First flange; 8. Pressure relief wheel connecting frame; 9. Connecting plate; 10. Second seed metering disc; 11. Second seed cleaning device; 12. Second housing; 13. Ventilation duct; 14. Seed blocking net; 15. Second flange; 16. Seed discharging pipe; 17. Seed inlet pipe; 18. Deflector; 19. Motor empty slot; 20. Seed cleaning device positioning hole; 21. Seed discharging point; 22. Groove; 23. Orifice; 24. First seed cleaning knife; 25. Second seed cleaning knife; 26. Third seed cleaning knife; 27. First pressure relief wheel; 28. Second pressure relief wheel; 29. Seed cleaning knife fixing frame; 30. Base; 31. Seed cleaning device adjusting mechanism; 32. Arc-shaped frame. Detailed implementation manners

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

[0036] Please refer to Figures 1 to 14 As shown, a high-speed precision seed metering device for closely planting in a pinwheel pattern with double seed belts in narrow rows of corn is shown, which includes: a housing, a first cavity structure and a second cavity structure are provided inside the housing; a seed inlet pipe 17 and a ventilation duct 13 communicating with the outside are provided on the housing; a seed discharging pipe 16 communicating with the outside is respectively provided in the first cavity structure and the second cavity structure, and a seed discharging point 21 is provided at the upper end of each seed discharging pipe 16;

[0037] It further includes: a motor 2, a first seed cleaning device 5, a first seed metering disc 6, a pressure relief wheel connecting frame 8, a second seed metering disc 10, a second seed cleaning device 11, a first pressure relief wheel 27 and a second pressure relief wheel 28. The pressure relief wheel connecting frame 8 is installed inside the housing; the second seed metering disc 10 is sleeved on the pressure relief wheel connecting frame 8, the first seed metering disc 6 and the second seed metering disc 10 are connected to each other, and the motor 2 is used to drive the first seed metering disc 6 and the second seed metering disc 10 to rotate synchronously around the axis of the pressure relief wheel connecting frame 8; a plurality of orifices 23 on the first seed metering disc 6 and a plurality of orifices 23 on the second seed metering disc 10 are arranged staggeredly; the first pressure relief wheel 27 and the second pressure relief wheel 28 are both installed on the pressure relief wheel connecting frame 8; the first pressure relief wheel 27 is located inside the first seed metering disc 6 and above the end of the seed discharging pipe 16 in the first cavity structure; the second pressure relief wheel 28 is located inside the second seed metering disc 10 and above the end of the seed discharging pipe 16 in the second cavity structure; the first seed cleaning device 5 is installed inside the housing and between the seed inlet pipe 17 and the seed discharging pipe 16 in the first cavity structure; the second seed cleaning device 11 is installed inside the housing and between the seed inlet pipe 17 and the seed discharging pipe 16 in the second cavity structure. The first seed cleaning device 5 is used to clean the redundant seeds at the position of the orifices 23 of the first seed metering disc 6, and the second seed cleaning device 11 is used to clean the redundant seeds at the position of the orifices 23 of the second seed metering disc 10;

[0038] The first seed cleaning device 5, the first seed rowing disc 6 and the first pressure relief wheel 27 are located in the first cavity structure, and the second seed rowing disc 10, the second seed cleaning device 11 and the second pressure relief wheel 28 are located in the second cavity structure;

[0039] When the first seed tray 6 transfers the seeds to the seed unloading point 21, the first pressure relief wheel 27 is used to relieve the pressure on the seeds on the first seed tray 6 so that they fall into the seed outlet tube 16 in the first cavity structure; when the second seed tray 10 transfers the seeds to the seed unloading point 21, the second pressure relief wheel 28 is used to relieve the pressure on the seeds on the second seed tray 10 so that they fall into the seed outlet tube 16 in the second cavity structure.

[0040] Further, in a preferred embodiment, the shell includes: a first shell 1, a sealing ring 4, a connecting plate 9 and a second shell 12, the first shell 1 and the second shell 12 are respectively installed on the left and right sides of the connecting plate 9; a sealing ring 4 is installed between the first shell 1 and the connecting plate 9; a sealing ring 4 is installed between the second shell 12 and the connecting plate 9; the first shell 1 and the connecting plate 9 together form a first cavity structure, and the second shell 12 and the connecting plate 9 together form a second cavity structure.

[0041] Furthermore, in a preferred embodiment, it also includes: a first flange 7 and a second flange 15, the second seed disc 10 is rotatably mounted on the pressure relief wheel connecting frame 8 through the second flange 15, the first flange 7 is installed in the middle of the first seed disc 6, and the output spindle of the motor 2 is connected to the first flange 7.

[0042] Furthermore, in a preferred embodiment, a motor slot 19 is provided on the first shell 1, and the motor 2 is installed in the motor slot 19; the pressure relief wheel connecting frame 8 is installed on the second shell 12, and the ventilation duct 13 is installed on the second shell 12 and communicated with the pressure relief wheel connecting frame 8. The pressure relief wheel connecting frame 8 is a hollow tubular structure, and the internal cavity enclosed by the first seed row disk 6 and the second seed row disk 10 is realized based on this structure. The ventilation duct 13 is connected with the internal cavity through the pressure relief wheel connecting frame 8, and the ventilation duct 13 is used to realize that the air pressure in the first seed row disk 6 and the second seed row disk 10 is lower than the air pressure inside the shell, so that the seeds are pressed onto the surface of the mold hole 23; the seed inlet pipe 17 is installed on the connecting plate 9, and the seeds fall into the first cavity structure and the second cavity structure respectively after passing through the seed inlet pipe 17.

[0043] Furthermore, in a preferred embodiment, it also includes: a seed blocking net 14 and a guide plate 18, the seed blocking net 14 is installed in the shell and is located above the end of the seed inlet tube 17; the guide plate 18 is installed in the shell and is located below the end of the seed inlet tube 17, and the seeds entering the shell from the seed inlet tube 17 fall after colliding with the seed blocking net 14 and fall into the first cavity structure and the second cavity structure respectively under the action of the guide plate 18.

[0044] Further, in a preferred embodiment, it further includes: a seed blocking plate 3. Both of the two seed blocking plates 3 are installed in the housing and are symmetrically arranged left and right. The two seed blocking plates 3 are respectively disposed on the outer perimeters of the first seed metering disc 6 and the second seed metering disc 10. The clearance dimension between the inner edge of the seed blocking plate 3 and the outer edge of the first seed metering disc 6 or the second seed metering disc 10 is smaller than the size of the seeds.

[0045] Further, in a preferred embodiment, the number of the shaped holes 23 on the first seed metering disc 6 and the second seed metering disc 10 is the same; a plurality of the shaped holes 23 on the first seed metering disc 6 or the second seed metering disc 10 are arranged at equal angles circumferentially; any one of the shaped holes 23 on the first seed metering disc 6 and the plane where its axis is located are between two adjacent shaped holes 23 on the second seed metering disc 10, and pass through the angular bisector formed by the connection lines between the above two shaped holes 23 and any point on their axes; a plurality of grooves 22 are formed on the outer walls of both the first seed metering disc 6 and the second seed metering disc 10, and any one of the grooves 22 is located between two adjacent shaped holes 23; a plurality of the grooves 22 on the first seed metering disc 6 or the second seed metering disc 10 are arranged at equal angles circumferentially.

[0046] Further, in a preferred embodiment, the first seed cleaning device 5 and the second seed cleaning device 11 have the same structure, and both include: a first seed cleaning knife 24, a second seed cleaning knife 25, a third seed cleaning knife 26, a seed cleaning knife fixing frame 29, a base 30, a seed cleaning device adjusting mechanism 31 and an arc-shaped frame 32. The first seed cleaning knife 24, the second seed cleaning knife 25 and the third seed cleaning knife 26 are respectively installed at the seed cleaning end of the arc-shaped frame 32 through a seed cleaning knife fixing frame 29. A seed cleaning device positioning hole 20 is provided at the positioning end of the arc-shaped frame 32, and a base 30 and a seed cleaning device adjusting mechanism 31 are further installed at the seed cleaning end of the arc-shaped frame 32;

[0047] The arc-shaped frame 32 is rotatably installed on the first housing 1 or the second housing 12 through the positioning hole 20, and the arc-shaped frame 32 is slidably installed in a chute on the first housing 1 or the second housing 12 through the seed cleaning device adjusting mechanism 31;

[0048] The distances between the first seed cleaning knife 24, the second seed cleaning knife 25, the third seed cleaning knife 26 and the axis of the first seed metering disc 6 / the second seed metering disc 10 decrease in sequence.

[0049] The above are only preferred embodiments of the present invention, and do not thus limit the implementation manners and protection scope of the present invention.

[0050] The present invention further has the following implementation manners on the above basis:

[0051] In a further embodiment of the present invention, a high-speed precise metering seed drill with a narrow-row double-seedling belt in a pyramid-shaped dense planting pattern for corn and a seeding method thereof include a first seed plate 6, a second seed plate 10, a seed cleaning device adjusting mechanism 31, a progressive seed cleaning knife, a seed blocking plate 3, a sealing ring 4, a seed blocking net 14, a pressure relief wheel connecting frame 8, a motor 2, a connecting plate 9, and a housing. The first seed plate 6 and the second seed plate 10 are fixedly installed at an intersecting angle. The two seed plates have annularly and evenly distributed holes 23, and there are evenly distributed grooves 22 between the holes 23. The two seed plates are jointly supported by the first flange 7 and the second flange 15 in cooperation with the pressure relief wheel connecting frame 8 to operate in the seed drill. The first flange 7 is connected to the main shaft of the motor 2 and rotates. The second flange 15 is sleeved on the pressure relief wheel connecting frame 8, and the pressure relief wheel connecting frame 8 is fixed to the second housing 12 and communicated with the ventilation duct 13. The first pressure relief wheel 27 and the second pressure relief wheel 28 are fixed by the pressure relief wheel connecting frame 8 and respectively fit on the inner sides of the first seed plate 6 and the second seed plate 10 corresponding to the seed discharging point 21. The motor 2 is fixed in the empty slot of the first housing 1. The second housing 12 is provided with a ventilation duct 13 to allow the air flow in the seed drill to flow to the outside. Both the first housing 1 and the second housing 12 are provided with seed discharging pipes 16 and guide plates 18. The seed blocking plate 3 is installed on the housing by screws, and the middle hollow part fits with the outer edge of the seed plate but leaves a certain gap. The seed cleaning device is coaxially arranged with the seed plate and includes an adjusting mechanism and a progressive seed cleaning knife. The adjusting mechanism is a single-degree-of-freedom link-slider mechanism composed of three rotating pairs and one translating pair. The progressive seed cleaning knife is composed of a base 30, an arc-shaped frame 32, a first seed cleaning knife 24, a second seed cleaning knife 25, a third seed cleaning knife 26, and a seed cleaning knife fixing frame 29. One end of it is fixed on the positioning hole of the housing, and the other end slides on the chute of the housing. The bottom surface of the progressive seed cleaning knife fits on the surface of the seed plate. The connecting plate 9 is welded with a seed inlet pipe 17, and a card slot is provided behind the seed inlet pipe 17 to place the seed blocking net 14. The seed plate, the seed cleaning device, the housing, the seed blocking plate 3, the pressure relief wheel, etc. are symmetrically arranged. The first housing 1 and the second housing 12 are connected by the connecting plate 9 in cooperation with the sealing ring 4 to form two symmetrically arranged chambers on the left and right.

[0052] In a further embodiment of the present invention, a deflector plate 18 and a seed discharging pipe 16 are provided on the housing. An empty slot 19 for accommodating a motor 2 is provided inside the first housing 1, and a ventilation duct 13 communicating with the external air pressure is provided inside the second housing 12; a sealing ring 4 is sleeved inside the housing; the first seed discharging disk 6 and the second seed discharging disk 10 are fixedly installed at an intersecting angle; a pressure relief wheel for supporting and its connecting frame 8 are installed in the two seed discharging disks. Among them, the first pressure relief wheel 27 and the second pressure relief wheel 28 are closely attached to the inner side of the seed discharging disk corresponding to the seed discharging point 21. One side of the connecting frame 8 close to the first housing 1 is provided with a first flange 7, and a hole for cooperating with the main shaft of the motor 2 is opened on the first flange 7. The other side is fixedly connected to the connecting frame 8 through a second flange 15 on the second housing 12 and communicates with the ventilation duct 13; the seed discharging point 21 is located at the inlet position of the seed discharging pipe 16; a seed inlet pipe 17 is welded at the inlet of the connecting plate 9, and a clamping groove is provided behind the seed inlet pipe 17 for placing a seed blocking net 14; the seed blocking plate 3 is installed on the housing by screws, and the middle is hollow and fits with the outer edge of the seed disk but leaves a certain gap; the seed cleaning device is coaxially arranged with the seed discharging disk and includes an adjusting mechanism 31 and progressive seed cleaning knives. Among them, the progressive seed cleaning knives are composed of a base 30, an arc-shaped frame 32, a first seed cleaning knife 24, a second seed cleaning knife 25, a third seed cleaning knife 26 and a seed cleaning knife fixing frame 29. One end of it is fixed on the positioning hole 20 of the housing, and the other end can slide on the sliding groove of the housing; taking the middle cross-section of the connecting plate 9 as the symmetry plane, the seed discharging disk, the seed cleaning device, the sealing ring 4, the seed blocking plate 3, the first housing 1, the second housing 12, the first pressure relief wheel 27 and the second pressure relief wheel 28 are symmetrically arranged on the left and right; the connecting plate 9 cooperates with the sealing ring 4 to connect the first housing 1 and the second housing 12 to form two symmetrical chambers inside the seed discharger.

[0053] In a further embodiment of the present invention, the first seed discharging disk 6 and the second seed discharging disk 10 have the same size and structure. The diameter of the seed discharging disk is 176 mm, the width is 55 mm, and the thickness is 2.5 mm. The seed discharging disk is provided with annularly and evenly distributed type holes 23. The type holes 23 are frustum-shaped. The outer diameter of the type holes 23 is 5.5 mm, the depth is 2.5 mm, the inner diameter is 10.5 mm. The distance from the center line of the type hole 23 to the edge of the seed discharging disk is 16 mm, the distance from the center line of the type hole 23 to the center line of the seed discharging disk is 72 mm, the number of the type holes 23 is 25, the central angle corresponding to adjacent type holes 23 is 14.4°, the intersecting angle between the two seed discharging disks is 7.2°, grooves 22 are evenly distributed between the type holes 23, and the material of the seed discharging disk is ABS plastic.

[0054] In a further embodiment of the present invention, the seed cleaning device includes an adjusting mechanism 31 and progressive seed cleaning knives. The adjusting mechanism 31 is a single-degree-of-freedom link-slider mechanism composed of three rotating pairs and one translating pair. The first seed cleaning knife 24, the second seed cleaning knife 25, and the third seed cleaning knife 26 have the same size and structure, and their outer shape is similar to that of a suona. The diameter of the bottom plate of the seed cleaning knife is 22 mm, the diameter of the knife body is 11 mm, and the length of the knife body is 9 mm. A transition arc with a slope from 0° to 90° is provided between the seed cleaning knife body and the bottom plate. Inside, there is a through groove with a diameter of 5.5 mm for installing a countersunk head screw on the fixing bracket 29. The distances from the center lines of the first seed cleaning knife 24, the second seed cleaning knife 25, and the third seed cleaning knife 26 to the center line of the seed metering disc are 81 mm, 80 mm, and 79 mm respectively. The central angle between adjacent seed cleaning knives is 15°. The adjustable angle range of the seed cleaning knife is 0 - 5°. The material of the seed cleaning knife is rubber.

[0055] In a further embodiment of the present invention, the seed cleaning device includes an adjusting mechanism 31 and progressive seed cleaning knives, as Figure 12 shown. The adjusting mechanism 31 is a single-degree-of-freedom link-slider mechanism composed of three rotating pairs and one translating pair. The arc-shaped frame 32 is made of an arc-shaped rod, one end of which is rotatably installed on the first housing 1 or the second housing 12 through a positioning hole 20. The adjusting mechanism 31 is slidably installed on the arc-shaped frame 32. The shaft of the adjusting mechanism 31 located at the rear side of the arc-shaped frame 32 is a two-section eccentric shaft. By rotating the eccentric shaft, the adjusting mechanism 31 can be slid on the arc-shaped frame 32, thereby driving the arc-shaped frame 32 to rotate around the positioning hole 20.

[0056] In a further embodiment of the present invention, the base 30 is installed at the rear side of the arc-shaped frame 32 to fill the gap between the first housing 1 or the second housing 12 and the arc-shaped frame 32, facilitating the sliding of the adjusting mechanism 31 on the arc-shaped frame 32 and the rotation of the arc-shaped frame 32 around the positioning hole 20.

[0057] In a further embodiment of the present invention, the seed metering device has a left-right symmetric structure. When air flow and seeds flow in from the seed inlet pipe 17, there will be approximately the same pressure distribution and seed quantity in the two chambers. Under the action of the pressure difference inside and outside the cell 23 and the seed disturbing effect of the groove 22, the seeds are pressed onto the surface of the cell 23. Due to the staggered angle between the first seed metering disc 6 and the second seed metering disc 10, during the synchronous rotation of the seed metering disc, the seeds will be staggered and thrown out of the seed metering device at different times through the seed unloading point 21 and the seed outlet pipe 16 under the action of high-speed air flow, realizing the close planting sowing method of double seedling rows in a narrow row and in a herringbone pattern for corn under high-speed operation.

[0058] In a further embodiment of the present invention, the first seed metering disc 6 and the second seed metering disc 10 have the same size and structure. The staggered angle between the two seed metering discs is 7.2°. The diameter of the seed metering disc is 176 mm, the width is 55 mm, and the thickness is 2.5 mm. The material of the seed metering disc is ABS plastic. After the two seed metering discs are staggered and installed, the herringbone sowing of double seedling rows in a narrow row for corn can be realized.

[0059] In a further embodiment of the present invention, there are 25 type holes 23 evenly distributed in a ring on the seed metering disc. The distance from the center line of the type hole 23 to the edge of the seed metering disc is 16 mm, the distance from the center line of the type hole 23 to the center line of the seed metering disc is 72 mm, the central angle corresponding to adjacent type holes 23 is 14.4°, the type hole 23 is in the shape of a truncated cone, the outer diameter of the type hole 23 is 5.5 mm, the depth is 2.5 mm, the inner diameter is 10.5 mm, and evenly distributed grooves 22 are arranged between the type holes 23.

[0060] In a further embodiment of the present invention, the radial length of the groove 22 on the seed metering disc is 9.5 mm, and the arc radius on both sides of the groove 22 is 3 mm.

[0061] In a further embodiment of the present invention, the first seed cleaning knife 24, the second seed cleaning knife 25, and the third seed cleaning knife 26 have the same size and structure, and the outer shape is similar to a suona. The diameter of the bottom plate of the seed cleaning knife is 22 mm, the diameter of the knife body is 11 mm, the length of the knife body is 9 mm. A transition arc with a slope from 0° to 90° is provided between the seed cleaning knife body and the bottom plate. A through groove with a diameter of 5.5 mm is provided inside and is installed on the fixing frame by a countersunk head screw. The distances from the center lines of the first seed cleaning knife 24, the second seed cleaning knife 25, and the third seed cleaning knife 26 to the center line of the seed metering disc are 81 mm, 80 mm, and 79 mm respectively. The central angle between adjacent seed cleaning knives is 15°, the adjustable angle range of the seed cleaning knife is 0 - 5°, and the material of the seed cleaning knife is rubber.

[0062] In a further embodiment of the present invention, as another aspect of the present invention, the seeding method of the above-mentioned high-speed precision seeder for close planting in a pyramid shape with double seedling belts in narrow rows of corn is characterized in that: the left-right symmetric layout of the seeder provides a structural basis for sowing double seedling belts, and the distance in the thickness direction between the first seed metering disc 6 and the second seed metering disc 10 determines the row spacing of the narrow double seedling belts. The stagger angle between the first seed metering disc 6 and the second seed metering disc 10 is the structural basis for realizing pyramid-shaped seeding. Based on the pneumatic principle, the pressure difference inside and outside the seed metering disc ensures the stability of the seed seeding process, and the high-speed positive pressure air flow in the chamber enables the seeds to be quickly sown to meet the needs of high-speed operation.

[0063] In a further embodiment of the present invention, the air flow and seeds flow into the seeding tube 17 at the same time. Due to the symmetric layout of the seeder structure, there will be approximately the same pressure distribution and seed quantity in the two chambers when the seeder is working.

[0064] In a further embodiment of the present invention, the groove 22 can play an auxiliary role in filling the corn seed group in the chamber. The seeds are pressed onto the surface of the type hole 23 under the action of the pressure difference inside and outside the type hole 23 and the disturbing action of the groove 22.

[0065] In a further embodiment of the present invention, the distances of the first seed cleaning knife 24, the second seed cleaning knife 25, and the third seed cleaning knife 26 from the center of the seed plate decrease by 1 mm in sequence, which can gradually increase the force on the seeds passing through the seed cleaning device, increase the area ratio of the advantageous seeds in the apertures 23, and can not only remove the redundant seeds on the apertures 23 (when the number of seeds on the surface of a single aperture 23 exceeds 2), but also improve the sowing stability of the single-grain advantageous seeds.

[0066] In a further embodiment of the present invention, the first pressure relief wheel 27 and the second pressure relief wheel 28 are respectively attached to the inner sides of the first seed plate 6 and the second seed plate 10 corresponding to the inlet position of the seed outlet pipe 16 (seed unloading point 21) to cut off the air flow in the apertures 23 at the corresponding positions of the seed unloading point 21 and ensure that the seeds are smoothly dropped into the seed outlet pipe 16.

[0067] In a further embodiment of the present invention, the triangular planting, commonly known as the "crooked seedling", is based on the wide-narrow row planting pattern and is applicable to both flat planting and ridge planting. The seeds sown by the seeder are arranged in a triangular shape in a staggered manner, and this planting method is beneficial to the high yield of corn.

[0068] In a further embodiment of the present invention, the beneficial effects of the present invention are as follows: A high-speed precision seeder and seeding method for triangular close planting with narrow double seedling rows of corn are proposed. Based on the pneumatic principle, compared with the mechanical seeder, it can not only reduce the damage to the seeds, but also be more suitable for high-speed seeding operations. During the seed filling process, the cooperation of the air flow and the grooves 22 can enhance the disturbance of the corn seed group in the chamber and improve the seed filling performance. The seed cleaning device can adjust the seed cleaning angle by the adjustment mechanism, which can adapt to the seed cleaning operations under different shapes and working conditions. The structure of the seeder is relatively compact, reducing the energy consumption and wind pressure loss, improving the seeding efficiency, and meeting the agronomic requirements of triangular close planting with narrow double seedling rows of corn.

[0069] In a further embodiment of the present invention, Embodiment 1: Referring to the various figures, a high-speed precise metering seeder for closely planting corn in a narrow row with a double seedling belt in a pyramid shape includes a first seed metering disc 6, a second seed metering disc 10, a cleaning device adjusting mechanism 31, a progressive cleaning knife, a seed retaining plate 3, a sealing ring 4, a seed retaining net 14, a pressure relief wheel and its connecting frame 8, a motor 2, a connecting plate 9, and a housing. The first pressure relief wheel 27 and the second pressure relief wheel 28 are installed on the connecting frame 8. The connecting frame 8 cooperates with the first flange 7 and the second flange 15 to install the first seed metering disc 6 and the second seed metering disc 10. The motor 2 is installed in the empty slot 19 of the first housing 1, and its main shaft is connected to the first flange 7 to drive the seed metering disc. One end of the cylindrical sleeve on the other side of the connecting frame 8 has a clearance fit with the second flange 15 and the other end is fixed to the second housing 12. A ventilation duct 13 is also installed in the second housing 12 and is connected to the connecting frame 8, so that the positive pressure air flow in the chamber flows from the ventilation duct 13 to the outside. The two seed retaining plates 3 are respectively fixed to the first housing 1 and the second housing 12 by screws. The hollow part in the middle fits with the seed metering disc, but a certain gap is reserved. The progressive cleaning knife is composed of a base 30, an arc-shaped frame 32, a first cleaning knife 24, a second cleaning knife 25, a third cleaning knife 26, and a cleaning knife fixing frame 29, and cooperates with a single-degree-of-freedom rod-slider mechanism. One end is fixed to the positioning hole 20 of the housing, and the other end can slide on the chute of the housing. The bottom surface of the cleaning knife fits with the seed metering disc but leaves a certain gap. A seed outlet pipe 16 and a deflector 18 are installed on the housing. The seed outlet pipe 16 is installed below the seed unloading point 21, and the deflector 18 is located at the position below the seed after it flows in from the seed inlet pipe 17. The seeds will flow along the deflector 18 and be divided into the seeder chamber. The seed inlet pipe 17 is welded to the connecting plate 9. A slot is provided on the connecting plate 9 behind the seed inlet pipe 17 to place the seed retaining net 14. Taking the middle cross-section of the connecting plate 9 as the symmetry plane, the seed metering disc, the cleaning device, the sealing ring 4, the seed retaining plate 3, the first housing 1 and the second housing 12, the first pressure relief wheel 27 and the second pressure relief wheel 28 are symmetrically arranged on the left and right; the connecting plate 9 cooperates with the sealing ring 4 to connect the first housing 1 and the second housing 12 to form two symmetric chambers in the seeder.

[0070] In a further embodiment of the present invention, a high-speed precision seeding device for narrow rows of corn with double seedlings and dense planting in a triangular shape has the following working process: when the seeding device is in operation, corn seeds flow into the seeding device from the seed inlet tube 17 under the action of the positive pressure airflow and their own gravity, and are diverted into two symmetrical chambers through the guide plate 18 on the shell and retained in the chamber waiting for seed filling. At this time, the corn seed group to be filled is in a disturbed state under the action of the airflow and the groove 22 between the shaped holes 23. When the seed group to be filled reaches a certain filling height, the motor 2 drives the seeding disk to rotate, and the corn seeds are entrained by the airflow and pressed onto the surface of the shaped holes 23 and rotate with the seeding disk. After the corn seeds enter the seed cleaning operation range of the seed cleaning device, the seed cleaning device will remove the excess seeds pressed onto the shaped holes 23, so that only single seeds remain on its surface. Subsequently, the seeds in the single-grain state on the shaped hole 23 rotate with the seeding disc to the seeding point 21, and the pressure relief wheel blocks the inner side of the shaped hole 23 corresponding to the seeding point 21. The pressure difference between the inside and outside of the shaped hole 23 disappears, and the corn seeds lose the air flow pressure and separate from the seeding device through the seed outlet pipe 16 under the action of the positive pressure airflow, completing the seeding process.

[0071] In a further embodiment of the present invention, the present invention realizes seeding operation based on the pneumatic principle. Compared with traditional mechanical seeders, it can reduce seed damage and realize high-speed sowing operation under the action of airflow. The seeder presents a left-right symmetrical layout, and realizes inverted sowing through two staggered seed trays. It is equipped with a seed cleaning device with adjustable seed cleaning angle to adapt to corn seeds of different shapes and types and working conditions. It has high overall integration and compact structure. Compared with traditional pneumatic seeders, it reduces energy consumption and wind pressure loss, and meets the requirements of high-speed operation of inverted shaped dense planting of double seedling belts in narrow rows of corn.

[0072] In a further embodiment of the present invention, the guide plate 18 of the first shell 1 and the guide plate 18 of the second shell 12 together form an isosceles triangle structure with a high middle and low sides. Under the action of the two oblique sides of the triangle, the seeds slide into the first cavity structure and the second cavity structure.

[0073] In a further embodiment of the present invention, the present invention belongs to the technical field of agricultural machinery, and specifically relates to a high-speed precision seed metering device and a seed metering method for the diamond-shaped dense planting of double seedling belts in narrow rows of corn. Among them, the seed metering device includes a seed metering disc, a seed cleaning device, a seed baffle 3, a sealing ring 4, a seed blocking net 14, a pressure relief wheel and its connecting frame, a motor 2, a connecting plate 9 and a housing. The seed metering disc, the seed cleaning device, the housing, the seed baffle 3, etc. are symmetrically arranged. The first housing 1 and the second housing 12 are connected by the connecting plate 9 and the sealing ring 4, and two symmetrically arranged chambers are formed after assembly; the housing includes a first housing 1 and a second housing 12 both provided with a guide plate 18 and a seed outlet pipe 16. An empty groove for accommodating the motor is provided in the first housing 1, and a ventilation duct 13 communicating with the external air pressure is provided in the second housing 12; the connecting plate 9 is provided with a seed inlet pipe 17 for the inflow of air and seeds; the seed metering disc includes conical holes 23 evenly distributed in a ring shape, and grooves 22 evenly distributed are opened between the conical holes 23; the seed cleaning device includes an adjustment mechanism and a progressive seed cleaning knife. The two identical seed discs of the seed metering device are fixedly installed at a certain angle offset and cooperate with the high-speed positive pressure air flow to throw seeds, which can meet the requirements of diamond-shaped dense planting of double seedling belts in narrow rows of corn under high-speed operation conditions.

[0074] The above are only preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly. For those skilled in the art, it should be able to realize that the solutions obtained by equivalent substitution and obvious changes made by using the description and illustration content of the present invention should all be included in the protection scope of the present invention.

Claims

1. A high-speed precise seed metering device for close planting in a pinwheel pattern with narrow double seedling rows for corn, characterized in that, Comprising: a housing, within which a first cavity structure and a second cavity structure are provided; on the housing, there are provided a seed inlet pipe (17) and a ventilation duct (13) communicating with the outside; within the first cavity structure and the second cavity structure, there is respectively provided a seed outlet pipe (16) communicating with the outside; Further comprising: a motor (2), a first seed cleaning device (5), a first seed metering disc (6), a pressure relief wheel connecting frame (8), a second seed metering disc (10), a second seed cleaning device (11), a first pressure relief wheel (27) and a second pressure relief wheel (28), the pressure relief wheel connecting frame (8) is installed inside the housing; the second seed metering disc (10) is sleeved on the pressure relief wheel connecting frame (8), the first seed metering disc (6) and the second seed metering disc (10) are connected to each other, the motor (2) is used to drive the first seed metering disc (6) and the second seed metering disc (10) to rotate synchronously around the axis of the pressure relief wheel connecting frame (8); a plurality of mold holes (23) on the first seed metering disc (6) are arranged staggeredly with a plurality of mold holes (23) on the second seed metering disc (10); the first pressure relief wheel (27) and the second pressure relief wheel (28) are both installed on the pressure relief wheel connecting frame (8); the first pressure relief wheel (27) is located inside the first seed metering disc (6) and above the end of the seed outlet pipe (16) in the first cavity structure; the second pressure relief wheel (28) is located inside the second seed metering disc (10) and above the end of the seed outlet pipe (16) in the second cavity structure; the first seed cleaning device (5) is installed inside the housing and between the seed inlet pipe (17) and the seed outlet pipe (16) in the first cavity structure; the second seed cleaning device (11) is installed inside the housing and between the seed inlet pipe (17) and the seed outlet pipe (16) in the second cavity structure.

2. The narrow-row double-seedling-belt pyramid-shaped dense planting high-speed precision metering device for corn according to claim 1, characterized in that, The housing includes: a first housing (1), a sealing ring (4), a connecting plate (9) and a second housing (12), the first housing (1) and the second housing (12) are respectively installed on the left and right sides of the connecting plate (9); a sealing ring (4) is assembled between the first housing (1) and the connecting plate (9); a sealing ring (4) is assembled between the second housing (12) and the connecting plate (9); the first housing (1) and the connecting plate (9) enclose to form the first cavity structure, and the second housing (12) and the connecting plate (9) enclose to form the second cavity structure.

3. The narrow-row double-seedling-zone staggered dense planting high-speed precision metering seeder for corn according to claim 2, characterized in that, Further comprising: a first flange (7) and a second flange (15), the second seed metering disc (10) is rotatably installed on the pressure relief wheel connecting frame (8) through the second flange (15), the first flange (7) is installed in the middle of the first seed metering disc (6), and the output main shaft of the motor (2) is connected to the first flange (7).

4. The narrow-row double-seedling-belt staggered dense planting high-speed precision metering seeder for corn according to claim 2, wherein On the first housing (1), there is provided a motor empty slot (19), the motor (2) is installed in the motor empty slot (19); the pressure relief wheel connecting frame (8) is installed on the second housing (12), and the ventilation duct (13) is installed on the second housing (12) and communicates with the pressure relief wheel connecting frame (8).

5. The narrow-row double-seedling-belt triangular close-planting high-speed precision seed metering device for corn according to claim 4, characterized in that Further comprising: A seed blocking net (14) and a diversion plate (18), the seed blocking net (14) is installed inside the housing and above the end of the seed inlet pipe (17); the diversion plate (18) is installed inside the housing and below the end of the seed inlet pipe (17).

6. The narrow-row double-seedling-zone diamond-shaped dense-planting high-speed precision seed metering device for corn according to claim 1, characterized in that It further includes: Seed blocking plates (3), two seed blocking plates (3) are both installed inside the housing and are symmetrically arranged left and right. The two seed blocking plates (3) are respectively arranged on the outer peripheries of the first seed metering disc (6) and the second seed metering disc (10). The clearance size between the inner edge of the seed blocking plate (3) and the outer edge of the first seed metering disc (6) or the second seed metering disc (10) is smaller than the size of the seeds.

7. The narrow-row double-seedling-belt staggered dense planting high-speed precision metering drill for corn according to claim 1, characterized in that, The number of the type holes (23) on the first seed metering disc (6) and the second seed metering disc (10) is the same; a plurality of type holes (23) on the first seed metering disc (6) or the second seed metering disc (10) are arranged at equal angles in a circle; any one type hole (23) on the first seed metering disc (6) and the plane where its axis is located are between two adjacent type holes (23) on the second seed metering disc (10), and pass through the angular bisector formed by the connection line between the above two type holes (23) and any point on their axis; a plurality of grooves (22) are opened on the outer walls of the first seed metering disc (6) and the second seed metering disc (10), and any one groove (22) is located in the middle of two adjacent type holes (23); a plurality of grooves (22) on the first seed metering disc (6) or the second seed metering disc (10) are arranged at equal angles in a circle.

8. The narrow-row double-seedling-belt diamond-shaped dense planting high-speed precision metering device for corn according to claim 2, characterized in that, The first seed cleaning device (5) and the second seed cleaning device (11) have the same structure, and both include: a first seed cleaning knife (24), a second seed cleaning knife (25), a third seed cleaning knife (26), a seed cleaning knife fixing frame (29), a base (30), a seed cleaning device adjusting mechanism (31) and an arc-shaped frame (32). The first seed cleaning knife (24), the second seed cleaning knife (25) and the third seed cleaning knife (26) are respectively installed at the seed cleaning end of the arc-shaped frame (32) through a seed cleaning knife fixing frame (29). A seed cleaning device positioning hole (20) is provided at the positioning end of the arc-shaped frame (32), and a base (30) and a seed cleaning device adjusting mechanism (31) are also installed at the seed cleaning end of the arc-shaped frame (32).

9. The high-speed precise metering seed drill for close planting in a triangular pattern with narrow double seedling rows of corn according to claim 8, characterized in that, The arc-shaped frame (32) is rotatably installed on the first housing (1) or the second housing (12) through the positioning hole (20), and the arc-shaped frame (32) is slidably installed in a chute on the first housing (1) or the second housing (12) through the seed cleaning device adjusting mechanism (31); The distances between the first seed cleaning knife (24), the second seed cleaning knife (25), the third seed cleaning knife (26) and the axis of the first seed metering disc (6) / the second seed metering disc (10) decrease in sequence.

10. A seeding method for a high-speed precision seeder with a narrow-row double-seedling-belt and a staggered dense planting pattern for corn, applicable to the high-speed precision seeder with a narrow-row double-seedling-belt and a staggered dense planting pattern for corn as described in any one of claims 1 to 9, characterized in that, The working process is as follows: When the metering device is operating, corn seeds flow into it from the seed inlet pipe (17) of the metering device under the action of positive-pressure air flow and their own gravity. They are diverted by the guide plate (18) on the housing and enter the first cavity structure and the second cavity structure, where they stay and wait for seeding; at this time, the corn seed groups to be seeded in the first cavity structure and the second cavity structure are in a disturbed state under the action of the air flow and the groove (22) between the hole patterns (23); when the seeding heights of the seed groups to be seeded in the first cavity structure and the second cavity structure reach a certain level, the motor (2) drives the first seed plate (6) and the second seed plate (10) to rotate, and the corn seeds are carried by the air flow and pressed onto the surface of the hole patterns (23) on the first seed plate (6) or the second seed plate (10) and rotate with the first seed plate (6) or the second seed plate (10); after the corn seeds enter the seeding cleaning range of the first seeding cleaning device (5) or the second seeding cleaning device (11), the first seeding cleaning device (5) or the second seeding cleaning device (11) will clean the excess seeds pressed onto the hole patterns (23), so that only single seeds remain on their surfaces; subsequently, the seeds in a single-seed state on the hole patterns (23) rotate with the first seed plate (6) or the second seed plate (10) to the seed unloading point (21), and the first pressure relief wheel (27) or the second pressure relief wheel (28) blocks the inside of the hole patterns (23) corresponding to the seed unloading point (21). The pressure difference inside and outside the hole patterns (23) disappears, and the corn seeds lose the air flow pressing force and are separated from the metering device through the seed outlet pipe (16) under the action of the positive-pressure air flow, completing the seeding process.

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