A lightweight air-blowing seed metering device

Abstract

The present invention provides a lightweight air-blowing seed metering device, comprising a seed box, a seed baffle, an air inlet pipe, an air nozzle, a seed unloading plate, a locking handwheel, a seed disc, a seed disc mounting seat component, a rear shell and a seed cleaning mechanism. The seed box is mounted on the upper rear side of the rear shell, the air inlet pipe and the air nozzle are mounted above the rear shell, the seed baffle is mounted on the upper side of the rear shell, the seed baffle is located on the rear side of the air inlet pipe and contacts the seed box, the seed unloading plate is connected to the rear shell by a spring and a bolt, one side of the seed disc mounting seat component is connected to the rear shell, and the other side of the seed disc mounting seat component is connected to the locking handwheel. Under the clamping action of the locking handwheel, the seed disc is pressed against the seed disc mounting seat component, thereby realizing the rotation of the seed disc relative to the seed disc mounting seat component, and the seed cleaning mechanism is mounted on the lower left side of the rear shell by screws.

Description

Technical Field

[0001] The present invention belongs to the field of agricultural machinery technology and specifically relates to a lightweight air-blowing seed metering device. Background Art

[0002] As a key component of precision seeding technology, the seed meter must demonstrate excellent seeding performance, ensuring a smooth and continuous flow of uniform seed without reseeding or missed seed. When seeding small plots on complex terrain, especially in sloping and undulating conditions, traditional mechanical seed meters can result in poor seed filling in the holes, leading to seed drop and leakage. Pneumatic seed meters, on the other hand, require high airflow and consume a lot of energy. In contrast, air-blown seed meters utilize gravity to fill seeds and airflow to clear them, resulting in better seed adaptability, lower airtightness requirements, and higher seeding efficiency. In particular, the airflow cleaning process minimizes seed damage.

[0003] At present, there are relatively few mature air-blown seeding devices on the market. The existing air-blown seeding devices have problems such as complex structure, heavy weight, difficult loading and unloading of seed trays, inconvenient adjustment of seed input volume, and fixed air-blowing height. At the same time, there are also phenomena such as missed seeds, repeated seeds, and knocked seeds.

[0004] In summary, designing a lightweight seeding device with compact structure, easy disassembly and assembly, shockproof and leakage reduction, and stable and precise seeding has become an urgent problem to be solved. Summary of the Invention

[0005] In order to overcome a series of defects in the prior art, the purpose of the present invention is to provide a light and simple air-blowing seed metering device for the above-mentioned problems, including a seed box 1, a seed blocking plate 2, an air inlet pipe 11, an air nozzle 12, a seed unloading plate 9, a locking handwheel 5, a seeding disc 6, a seeding disc mounting seat component 7, a rear shell 3 and a seed cleaning mechanism 4, wherein the seed box 1 is installed on the upper rear side of the rear shell 3, the air inlet pipe 11 and the air nozzle 12 are installed on the upper side of the rear shell 3, the seed blocking plate 2 is installed on the upper side of the rear shell 3, and the seed blocking plate 11 is installed on the upper side of the rear shell 3. Plate 2 is located on the rear side of the air inlet pipe 11 and in contact with the seed box 1. The seed unloading plate 9 is connected to the rear shell 3 by a spring and a bolt. One side of the seed disc mounting seat component 7 is connected to the rear shell 3, and the other side of the seed disc mounting seat component 7 is connected to the locking handwheel 5. Under the clamping action of the locking handwheel 5, the seed disc 6 is pressed against the seed disc mounting seat component 7, realizing the rotation of the seed disc 6 relative to the seed disc mounting seat component 7. The seed cleaning mechanism 4 is installed on the lower left side of the rear shell 3 by screws.

[0006] Preferably, the seed box 1 includes a lower seed box 107, a seed box cover 105 and a rear baffle 110, the lower seed box 107 is used to store seeds, the seed box cover 105 is used to close the seed box 1, the seed box cover 105 is fixed to the lower seed box 107 through the mounting hole V106, and the rear baffle 110 fixes the seed box 1 to the rear shell 3 through the mounting hole I101, the mounting hole II102, the mounting hole III103, the mounting hole IV104, the mounting hole VI109, the mounting hole VII111 and the mounting hole VIII112.

[0007] Preferably, the rear shell 3 includes a seed dropping channel 301, a seed cleaning knife mounting seat 302, a center hole 303, an anti-seed jamming rubber member mounting groove 304, a seed unloading plate mounting hole 305, an observation window mounting groove 306, a seed box mounting seat 307, a seed baffle plate groove 308 and an air nozzle mounting groove II 309. The seed cleaning knife mounting seat 302 is used to install the seed cleaning mechanism 4. The seed cleaning knife installed on the seed cleaning knife mounting seat 302 extends into the rectangular groove opened on the seeding disk 6 to force the seeds to be pushed out during the seeding stage. The seed dropping channel 301 is used to discharge the seeds discharged from the seeding disk 6. The anti-seed jamming rubber member mounting groove 304 is installed with an anti-seed jamming rubber member 8. The seed unloading plate The mounting hole 305 is used to install the seed unloading plate 9, the observation window 10 is installed in the observation window mounting groove 306, the seed box mounting seat 307 is used to support and fix the seed box 1, the seed blocking plate groove 308 is used to install the seed blocking plate 2, and the seed blocking plate 2 makes a linear motion along the seed blocking plate groove 308 to adjust the seed intake amount, and the rear baffle 110 is provided with an air nozzle mounting groove I108, the air nozzle mounting groove II309 and the air nozzle mounting groove I108 are used to install the air nozzle 12, and the air nozzle 12 makes an up and down motion along the air nozzle mounting groove II309 and the air nozzle mounting groove I108 to adjust the height of the air nozzle 12, and the air intake pipe 11 is connected to the air nozzle 12 by screws.

[0008] Preferably, the air nozzle 12 is arranged at an inclination of 7° relative to the vertical direction, and the air outlet of the air nozzle 12 is arranged in a grid shape to improve the seed cleaning effect.

[0009] Preferably, the seed disc mounting seat component 7 includes a shaft 705, a seed disc base 702, a bearing 706 and a sleeve II 703. The bearing 706 and the shaft 705 are installed at the center hole 303. The seed disc base 702 is provided with a boss II 707 and a boss III 708. The sleeve II 703 is combined with the seed disc base hole 701 and then installed together to the shoulder 704 on the shaft 705 to ensure axial positioning. The sleeve II 703 ensures the common rotation of the seed disc base 702 and the shaft 705.

[0010] Preferably, the seed disc 6 is provided with a groove 601, a boss I 602, a seed disc surface 603 and a seed disc combination hole 604. The seed disc 6 is installed on the seed disc base 702 through the boss II 707 via the groove 601. The boss II 707 and the groove 601 cooperate to ensure that the seed disc 6 is circumferentially fixed, and the seed disc 6 rotates together with the seed disc base 702.

[0011] Preferably, the locking handwheel 5 is provided with a sleeve I 501 and a locking handwheel hole 502, the sleeve I 501 is installed in the locking handwheel hole 502 and is jointly installed on the shaft shoulder 704, the locking handwheel 5 rotates on the sleeve I 501, and the sleeve I 501 is used to prevent the locking handwheel 5 from sliding out axially, and the seed disc 6 can be taken out when the handle of the locking handwheel 5 is rotated to be flush with the boss II 707.

[0012] Preferably, the seed disc surface 603 and the boss III 708 are arranged at a certain inclination, and the locking handwheel 5 rotates clockwise along the seed disc surface 603 and the boss III 708 to stop at the boss I 602. As the inclined surface rises, the locking handwheel 5 moves axially toward the seed disc base 702 to press the seed disc 6 against the seed disc base 702, thereby ensuring that the seed disc 6 rotates reliably.

[0013] Preferably, the upper part of the seed tray combination hole 604 adopts a conical hole, and the lower part of the seed tray combination hole 604 adopts a combination of cylindrical holes and rectangular grooves, so that the pressure difference between the upper and lower airflows in the seed tray combination hole 604 is larger, thereby clearing out the excess seeds on the upper side of the seed tray combination hole 604, ensuring that a single seed is pressed on the bottom of the seed tray combination hole 604, thereby improving the seed cleaning efficiency.

[0014] Preferably, when working, the chamber of the seed disc 6 is divided into a seed filling area, a seed clearing area, a seed protection area and a seed throwing area according to function. The anti-seed jamming rubber part 8 includes an anti-seed jamming groove 801 and an installation groove 802. The anti-seed jamming groove 801 is used to prevent seeds from getting stuck between the seed disc 6 and the rear shell 3 when entering the seed protection area, and the installation groove 802 is used to fix the anti-seed jamming rubber part 8 on the rear shell 3.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) The combined holes of the seed tray in this application use conical holes on the upper part and a combination of cylindrical holes and rectangular slots on the lower part. This design can better clear out excess seeds and press single seeds onto the bottom, thereby ensuring reliable seed protection on undulating terrain. At the same time, it can reduce the air pressure required for seed cleaning, reduce energy consumption, and improve the seeding qualification rate. It is suitable for corn and soybean sowing;

[0017] 2) This application designs a seed disc mounting base and an axial locking mechanism. The seed disc can be fixed and removed by turning the locking handwheel, ensuring that the seed disc does not move axially when rotating. At the same time, it is convenient to install and remove the seed disc. This design eliminates the front shell cover of the seeding device, simplifies the overall structure, is lighter and simpler, has a more compact structure, and is easier to disassemble.

[0018] 3) This application designs an air nozzle height adjustment mechanism to connect the air nozzle and the rear housing, which can be adjusted to different heights according to different seeds and different operating speeds, thereby improving air blowing efficiency and reducing energy consumption. It also designs a seed feed amount adjustment mechanism installed on the rear housing of the seed meter to control the seed drop speed, prevent seed accumulation, and improve the seed filling efficiency of the seed meter;

[0019] 4) This application designs an anti-seed jamming device, which designs a groove-shaped rubber on the left side of the air nozzle to solve the problem of seeds knocking and jamming when entering the seed protection area;

[0020] 5) This application optimizes the air nozzle structure, designs the air nozzle to be tilted 7° vertically, and adopts a grid-shaped air outlet to improve the seed cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of the structure of this application;

[0022] Figure 2 Three views for the gas application;

[0023] Figure 3 It is a structural diagram of the seed tray;

[0024] Figure 4 Schematic diagram of the structure of the seed box;

[0025] Figure 5 Schematic diagram of the structure of the rear shell;

[0026] Figure 6 This is a structural diagram of the seed tray mounting seat components;

[0027] Figure 7 It is a cross-sectional view of the locking hand wheel;

[0028] Figure 8 This is a schematic diagram of the structure of the anti-jamming rubber component;

[0029] Figure 9 This is the area division diagram of the seed tray working chamber;

[0030] Figure 10 This is the three-view drawing of the gas nozzle.

[0031] The accompanying drawings are denoted as follows:

[0032] 1-seed box, 2-seed baffle, 3-rear housing, 4-seed cleaning mechanism, 5-locking handwheel, 6-seed disc, 7-seed disc mounting seat, 8-anti-seed jamming rubber part, 9-seed unloading plate, 10-observation window, 11-air inlet pipe, 12-air nozzle;

[0033] 101-Mounting hole I, 102-Mounting hole II, 103-Mounting hole III, 104-Mounting hole IV, 105-Seed box cover, 106-Mounting hole V, 107-Seed box, 108-Gas nozzle mounting slot I, 109-Mounting hole VI, 110-Rear baffle, 111-Mounting hole VII, 112-Mounting hole VIII, 301-Seed drop channel, 302-Seed cleaning knife mounting seat, 303-Center hole, 304-Anti-seed jamming rubber mounting slot, 305-Seed unloading plate mounting hole, 306-Observation window mounting hole Mounting slot, 307-seed box mounting seat, 308-seed baffle slot, 309-air nozzle mounting slot II, 501-sleeve I, 502-locking handwheel hole, 601-groove, 602-boss I, 603-seed disk surface, 604-seed disk combination hole, 701-seed disk base hole, 702-seed disk base, 703-sleeve II, 704-shaft shoulder, 705-shaft, 706-bearing, 707-boss II, 708-boss III, 801-anti-seed slot, 802-mounting slot. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Throughout the drawings, identical or similar reference numerals represent identical or similar elements or elements having identical or similar functions. The described embodiments are only some, not all, of the embodiments of the present invention.

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0036] The embodiments and directional terms described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0037] In a broad embodiment of the present invention, a light and simple air-blowing seed metering device includes a seed box 1, a seed baffle 2, an air inlet pipe 11, an air nozzle 12, a seed unloading plate 9, a locking handwheel 5, a seeding disc 6, a seeding disc mounting seat component 7, a rear shell 3 and a seed cleaning mechanism 4, wherein the seed box 1 is mounted on the upper rear side of the rear shell 3, the air inlet pipe 11 and the air nozzle 12 are mounted on the upper side of the rear shell 3, the seed baffle 2 is mounted on the upper side of the rear shell 3, and the seed baffle 2 is located on the air inlet pipe 1 1 and in contact with the seed box 1, the seed unloading plate 9 and the rear shell body 3 are connected by springs and bolts, one side of the seed disc mounting seat component 7 is connected to the rear shell body 3, and the other side of the seed disc mounting seat component 7 is connected to the locking handwheel 5. Under the clamping action of the locking handwheel 5, the seed disc 6 is pressed against the seed disc mounting seat component 7, thereby realizing the rotation of the seed disc 6 relative to the seed disc mounting seat component 7, and the seed cleaning mechanism 4 is mounted on the lower left side of the rear shell body 3 by screws.

[0038] Preferably, the seed box 1 includes a lower seed box 107, a seed box cover 105 and a rear baffle 110, the lower seed box 107 is used to store seeds, the seed box cover 105 is used to close the seed box 1, the seed box cover 105 is fixed to the lower seed box 107 through the mounting hole V106, and the rear baffle 110 fixes the seed box 1 to the rear shell 3 through the mounting hole I101, the mounting hole II102, the mounting hole III103, the mounting hole IV104, the mounting hole VI109, the mounting hole VII111 and the mounting hole VIII112.

[0039] Preferably, the rear shell 3 includes a seed dropping channel 301, a seed cleaning knife mounting seat 302, a center hole 303, an anti-seed jamming rubber member mounting groove 304, a seed unloading plate mounting hole 305, an observation window mounting groove 306, a seed box mounting seat 307, a seed baffle plate groove 308 and an air nozzle mounting groove II 309. The seed cleaning knife mounting seat 302 is used to install the seed cleaning mechanism 4. The seed cleaning knife installed on the seed cleaning knife mounting seat 302 extends into the rectangular groove opened on the seeding disk 6 to force the seeds to be pushed out during the seeding stage. The seed dropping channel 301 is used to discharge the seeds discharged from the seeding disk 6. The anti-seed jamming rubber member mounting groove 304 is installed with an anti-seed jamming rubber member 8. The seed unloading plate The mounting hole 305 is used to install the seed unloading plate 9, the observation window 10 is installed in the observation window mounting groove 306, the seed box mounting seat 307 is used to support and fix the seed box 1, the seed blocking plate groove 308 is used to install the seed blocking plate 2, and the seed blocking plate 2 makes a linear motion along the seed blocking plate groove 308 to adjust the seed intake amount, and the rear baffle 110 is provided with an air nozzle mounting groove I108, the air nozzle mounting groove II309 and the air nozzle mounting groove I108 are used to install the air nozzle 12, and the air nozzle 12 makes an up and down motion along the air nozzle mounting groove II309 and the air nozzle mounting groove I108 to adjust the height of the air nozzle 12, and the air intake pipe 11 is connected to the air nozzle 12 by screws.

[0040] Preferably, the air nozzle 12 is arranged at an inclination of 7° relative to the vertical direction, and the air outlet of the air nozzle 12 is arranged in a grid shape to improve the seed cleaning effect.

[0041] Preferably, the seed disc mounting seat component 7 includes a shaft 705, a seed disc base 702, a bearing 706 and a sleeve II 703. The bearing 706 and the shaft 705 are installed at the center hole 303. The seed disc base 702 is provided with a boss II 707 and a boss III 708. The sleeve II 703 is combined with the seed disc base hole 701 and then installed together to the shoulder 704 on the shaft 705 to ensure axial positioning. The sleeve II 703 ensures the common rotation of the seed disc base 702 and the shaft 705.

[0042] Preferably, the seed disc 6 is provided with a groove 601, a boss I 602, a seed disc surface 603 and a seed disc combination hole 604. The seed disc 6 is installed on the seed disc base 702 through the boss II 707 via the groove 601. The boss II 707 and the groove 601 cooperate to ensure that the seed disc 6 is circumferentially fixed, and the seed disc 6 rotates together with the seed disc base 702.

[0043] Preferably, the locking handwheel 5 is provided with a sleeve I 501 and a locking handwheel hole 502, the sleeve I 501 is installed in the locking handwheel hole 502 and is jointly installed on the shaft shoulder 704, the locking handwheel 5 rotates on the sleeve I 501, and the sleeve I 501 is used to prevent the locking handwheel 5 from sliding out axially, and the seed disc 6 can be taken out when the handle of the locking handwheel 5 is rotated to be flush with the boss II 707.

[0044] Preferably, the seed disc surface 603 and the boss III 708 are arranged at a certain inclination, and the locking handwheel 5 rotates clockwise along the seed disc surface 603 and the boss III 708 to stop at the boss I 602. As the inclined surface rises, the locking handwheel 5 moves axially toward the seed disc base 702 to press the seed disc 6 against the seed disc base 702, thereby ensuring that the seed disc 6 rotates reliably.

[0045] Preferably, the upper part of the seed tray combination hole 604 adopts a conical hole, and the lower part of the seed tray combination hole 604 adopts a combination of cylindrical holes and rectangular grooves, so that the pressure difference between the upper and lower airflows in the seed tray combination hole 604 is larger, thereby clearing out the excess seeds on the upper side of the seed tray combination hole 604, ensuring that a single seed is pressed on the bottom of the seed tray combination hole 604, thereby improving the seed cleaning efficiency.

[0046] Preferably, when working, the chamber of the seed disc 6 is divided into a seed filling area, a seed clearing area, a seed protection area and a seed throwing area according to function. The anti-seed jamming rubber part 8 includes an anti-seed jamming groove 801 and an installation groove 802. The anti-seed jamming groove 801 is used to prevent seeds from getting stuck between the seed disc 6 and the rear shell 3 when entering the seed protection area, and the installation groove 802 is used to fix the anti-seed jamming rubber part 8 on the rear shell 3.

[0047] The present invention will be further described in detail below with reference to the accompanying drawings, with reference to preferred embodiments of the present invention.

[0048] like Figure 1 As shown, a lightweight air-blowing seed metering device mainly consists of a seed box 1, a seed baffle 2, an air inlet pipe 11, an air nozzle 12, a seed discharge plate 9, a locking handwheel 5, a seed tray 6, a seed tray mounting seat component 7, a rear housing 3, an anti-seed jamming rubber member 8, an observation window 10, and a seed cleaning mechanism 4. The seed box 1 is mounted to the seed box mounting seat 307 of the rear housing 3 via bolts at mounting holes I 101, II 102, III 103, IV 104, VI ​​109, VII 111, and VIII 112. The seed box cover 105 is axially fixed to the seed box 1 via bolts and can be opened or closed. The rear baffle 110 is welded to the underside of the seed box 1.

[0049] The rear housing 3 is connected to the shaft 705 at the center hole 303 via the bearing 706. The observation window mounting groove 306 is screwed to the observation window 10. The seed unloading plate mounting hole 305 is connected to the seed unloading plate 9 via a spring and bolts. When the work is completed, it can be opened to pour out the remaining seeds. The seed box mounting seat 307 of the rear housing 3 contacts and overlaps with the lower seed box 107 of the seed box 1 and is connected via screws. The seed retaining plate 2 is mounted on the seed retaining plate groove 308 via butterfly bolts. The seed retaining plate 2 can move linearly along the seed retaining plate groove 308 to adjust the seed intake. The air inlet pipe 11 is connected to the air nozzle 12 via screws. The air nozzle 12 is mounted in the air nozzle mounting groove II 309 via butterfly bolts. The air nozzle 12 can be adjusted up and down to adjust the air intake. The seed cleaning mechanism 4 is mounted on the seed cleaning knife mounting seat 302 via screws.

[0050] Bearing 706 is installed in the center hole 303 and is concentrically installed with shaft 705. Sleeve II 703 is installed in the hole 701 of the seed disc base and is installed together with the shaft shoulder 704. The seed disc 6 is installed on the seed disc base 702 through the groove 601 through the boss II 707 of the seed disc base to achieve circumferential fixation. Sleeve I 501 is installed in the locking handwheel hole 502 and is installed together with the shaft shoulder 704. Rotating the locking handwheel 5 clockwise presses the seed disc 6 against the seed disc base 702, allowing the seed disc 6 to rotate.

[0051] The anti-seed jamming rubber part 8 consists of an anti-seed jamming groove 801 and an installation groove 802. The anti-seed jamming groove 801 is used to prevent seeds from getting stuck between the seed plate 6 and the rear shell 3 when entering the seed protection area, and the installation groove 802 is used to fix the anti-seed jamming rubber part 8 on the rear shell 3.

[0052] The working process of the present invention is as follows:

[0053] The air-blown seed metering device is powered by a motor. The shaft 705 of the seed tray mounting assembly 7 rotates under the motor, driving the seed tray 6 in turn. During operation, seeds fall from the seed box 1, flow through the flow restriction of the seed retaining plate 2, and flow evenly into the seed filling area. In the seed filling area, the seeds accumulate between the seed tray 6 and the seed unloading plate 9, and are then charged into the seed tray assembly holes 604 by gravity. When the seeds move to the seed clearing area, air flows in through the air inlet pipe 11, passes through the air nozzle 12, and is blown into the seed tray assembly holes 604. A vortex forms in the upper portion of the seed tray assembly holes 604, blowing excess seeds out of the assembly holes 604 and back into the seed filling area. A pressure differential forms between the upper and lower portions of the assembly holes 604, pressing individual seeds against the bottom of the assembly holes 604. The seeds continue to rotate with the seed disc assembly hole 604. The seeds that have not completely entered the bottom of the seed disc assembly hole 604 will enter the anti-stuck groove 801 under the rotation of the seed disc 6, preventing the seeds from getting stuck between the seed disc 6 and the rear shell 3 when entering the seed protection area. The seeds continue to rotate and enter the seed protection area between the seed disc 6 and the rear shell 3. The seeds are escorted to the seeding area. When they reach the seeding port, the seeds perform centrifugal motion under the action of their own gravity and centrifugal force, break away from the seed disc assembly hole 604, and are thrown out through the seed drop channel 301, completing the entire seeding process.

[0054] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A light-weight air-blowing seed metering device, comprising a seed box (1), a seed baffle (2), an air inlet pipe (11), an air nozzle (12), a seed discharge plate (9), a locking hand wheel (5), a seed plate (6), a seed plate mounting seat component (7), a rear shell (3) and a seed cleaning mechanism (4), characterized in that: The seed box (1) is installed on the upper rear side of the rear shell (3), the air intake pipe (11) and the air nozzle (12) are installed on the upper side of the rear shell (3), the seed blocking plate (2) is installed on the upper side of the rear shell (3), the seed blocking plate (2) is located on the rear side of the air intake pipe (11) and contacts the seed box (1), the seed unloading plate (9) is connected to the rear shell (3) by a spring and a bolt, one side of the seed disc mounting seat component (7) is connected to the rear shell (3), and the other side of the seed disc mounting seat component (7) is connected to the locking hand wheel (5), under the clamping action of the locking hand wheel (5), the seed disc (6) is pressed against the seed disc mounting seat component (7), so that the seed disc (6) can rotate relative to the seed disc mounting seat component (7), and the seed cleaning mechanism (4) is installed on the lower left side of the rear shell (3) by screws; The seed box (1) comprises a lower seed box (107), a seed box cover (105) and a rear baffle (110); the lower seed box (107) is used to store seeds; the seed box cover (105) is used to close the seed box (1); the seed box cover (105) is fixed to the lower seed box (107) through a mounting hole V (106); and the rear baffle (110) fixes the seed box (1) to the rear housing (3) through mounting holes I (101), II (102), III (103), IV (104), VI (109), VII (111) and VIII (112); The rear shell (3) includes a seed dropping channel (301), a seed cleaning knife mounting seat (302), a center hole (303), an anti-seed jamming rubber member mounting groove (304), a seed unloading plate mounting hole (305), an observation window mounting groove (306), a seed box mounting seat (307), a seed blocking plate groove (308) and an air nozzle mounting groove II (309). The seed cleaning knife mounting seat (302) is used to install a seed cleaning mechanism (4). The seed cleaning knife installed on the seed cleaning knife mounting seat (302) extends into a rectangular groove provided on the seeding disc (6) to force the seeds to be pushed out during the seeding stage. The seed dropping channel (301) is used to discharge the seeds discharged from the seeding disc (6). The anti-seed jamming rubber member mounting groove (304) is installed with an anti-seed jamming rubber member (8). The seed unloading plate mounting hole (3 05) is used to install the seed unloading plate (9), the observation window mounting groove (306) is installed with an observation window (10), the seed box mounting seat (307) is used to support and fix the seed box (1), the seed blocking plate groove (308) is used to install the seed blocking plate (2), the seed blocking plate (2) moves linearly along the seed blocking plate groove (308) to adjust the seed feeding amount, the rear baffle (110) is provided with an air nozzle mounting groove I (108), the air nozzle mounting groove II (309) and the air nozzle mounting groove I (108) are used to install the air nozzle (12), the air nozzle (12) moves up and down along the air nozzle mounting groove II (309) and the air nozzle mounting groove I (108) to adjust the height of the air nozzle (12), and the air inlet pipe (11) is connected to the air nozzle (12) by a screw; The seeding disc mounting seat component (7) includes a shaft (705), a seeding disc base (702), a seeding disc base hole (701), a bearing (706) and a sleeve II (703). The bearing (706) and the shaft (705) are mounted at the center hole (303). The seeding disc base (702) is provided with a boss II (707) and a boss III (708). The sleeve II (703) and the seeding disc base hole (701) are assembled and mounted together and then mounted together at the shaft shoulder (704) on the shaft (705) to ensure axial positioning. The sleeve II (703) ensures the common rotation of the seeding disc base (702) and the shaft (705). The locking handwheel (5) is provided with a sleeve I (501) and a locking handwheel hole (502). The sleeve I (501) is installed in the locking handwheel hole (502) and is installed together with the shaft shoulder (704). The locking handwheel (5) rotates on the sleeve I (501). The sleeve I (501) is used to prevent the locking handwheel (5) from sliding out in the axial direction. When the handle of the locking handwheel (5) is rotated to be flush with the boss II (707), the seed disc (6) can be taken out. The seeding disc (6) is provided with a groove (601), a boss I (602), a seeding disc surface (603) and a seeding disc combined hole (604); the seeding disc (6) is installed on the seeding disc base (702) through the groove (601) and the boss II (707); the boss II (707) and the groove (601) cooperate to ensure that the seeding disc (6) is circumferentially fixed, and the seeding disc (6) rotates together with the seeding disc base (702); The seeding disc surface (603) and the boss III (708) are arranged at a certain inclination, and the locking hand wheel (5) rotates clockwise along the seeding disc surface (603) and the boss III (708) to stop at the boss I (602). As the inclined surface rises, the locking hand wheel (5) moves axially toward the seeding disc base (702) to press the seeding disc (6) onto the seeding disc base (702), thereby ensuring that the seeding disc (6) rotates reliably.

2. A light-weight air-blowing seed metering device according to claim 1, characterized in that: The air nozzle (12) is arranged at an inclination of 7° relative to the vertical direction, and the air outlet of the air nozzle (12) is arranged in a grid shape to improve the seed cleaning effect.

3. A light-weight air-blowing seed metering device according to claim 1, characterized in that: The upper part of the seed tray combination hole (604) adopts a conical hole, and the lower part of the seed tray combination hole (604) adopts a combination of a cylindrical hole and a rectangular groove, so that the pressure difference between the upper and lower airflows in the seed tray combination hole (604) is larger, thereby clearing out the excess seeds on the upper side of the seed tray combination hole (604), ensuring that a single seed is pressed on the bottom of the seed tray combination hole (604), thereby improving the seed cleaning efficiency.

4. A light-weight air-blowing seed metering device according to claim 1, characterized in that: During operation, the chamber of the seeding disc (6) is divided into a seed filling area, a seed clearing area, a seed protection area and a seed dropping area according to function. The anti-seed jamming rubber part (8) comprises an anti-seed jamming groove (801) and a mounting groove (802). The anti-seed jamming groove (801) is used to prevent seeds from being jammed between the seeding disc (6) and the rear shell (3) when entering the seed protection area. The mounting groove (802) is used to fix the anti-seed jamming rubber part (8) on the rear shell (3).

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