Seed-metering plate assembly and air suction type dibbler

Abstract

The invention relates to the technical field of agricultural machinery, and provides a seed-metering plate assembly and an air suction type dibbler, the device comprises a seed-metering plate body and a plurality of seed-metering nozzles, the seed-metering plate body is provided with a plurality of mounting grooves, and the bottom of each mounting groove is provided with a mounting hole; the seed-metering nozzles are detachably connected with the seed-metering plate body, at least parts of the seed-metering nozzles are located in the mounting grooves, one ends of the seed-metering nozzles extend into the mounting holes, the multiple seed-metering nozzles correspond to the multiple mounting grooves in a one-to-one mode, the interior of each seed-metering nozzle is hollow, and the seed-metering nozzles are arranged in the mounting grooves in a one-to-one mode. The end face, facing the outer side, of the seed metering nozzle is an arc-shaped cavity which is concave inwards, and a through hole communicated with the interior of the seed metering nozzle is formed in the bottom of the arc-shaped cavity. According to the design, negative pressure adsorption is combined with the arc-shaped cavity, so that the problems of poor adsorption stability of flat special-shaped seeds, high reseeding rate and the like are solved, and the seeding uniformity and the working efficiency are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of agricultural machinery technology, and in particular to a seed metering disc assembly and an air-suction seeder. Background Technology

[0002] The hill-seeding device is the core component for precision sowing. According to its working principle, it is divided into two types: mechanical and pneumatic. Mechanical hill-seeding devices are not suitable for high-speed operation, have strict requirements on seed size, and are prone to seed damage. Pneumatic hill-seeding devices, on the other hand, are gradually replacing mechanical hill-seeding devices due to their advantages such as high working speed, less seed damage, and reliable seed metering performance.

[0003] In air-suction seeders, the seed metering disc is the core component for precise seeding by arranging seeds. However, existing seed metering discs designed for large, flat-shaped crop seeds (such as watermelon seeds, sunflower seeds, and pumpkin seeds) suffer from problems such as insufficient adhesion due to the small contact area between the flat seeds and the suction holes, making them prone to falling off due to airflow fluctuations. Therefore, the demand for efficient and precise seeding of large, flat seeds is increasing, necessitating optimization of the seed metering disc design and control technology. Summary of the Invention

[0004] The purpose of this application is to provide a seed metering disc that can optimize the adsorption force on flat-shaped seeds, so as to solve or alleviate the problems existing in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution: A seeding disc assembly, comprising: The seed metering tray body has multiple mounting slots, and the bottom of the mounting slots has mounting holes; Multiple seed metering nozzles are provided, each detachably connected to the seed metering disc body. At least a portion of each seed metering nozzle is located within a mounting groove, with one end extending into a mounting hole. Each seed metering nozzle corresponds one-to-one with a specific mounting groove. The seed metering nozzle is hollow inside, and the outer end face of the seed metering nozzle is an inwardly concave arc-shaped cavity. The bottom of the arc-shaped cavity has a through hole that communicates with the inside of the seed metering nozzle.

[0006] Optionally, the number of through holes is multiple, and the multiple through holes are divided into a central hole and multiple peripheral holes. The central hole is located at the center of the bottom surface of the arc-shaped cavity, and the multiple peripheral holes are arranged at uniform intervals around the central hole.

[0007] Optionally, the diameter of the central hole is larger than the diameter of the peripheral hole.

[0008] Optionally, it also includes a seeding disc, which surrounds the periphery of the seed metering disc body and the seed metering disc body is rotatable relative to the seeding disc. The seeding disc is provided with a plurality of first seed guide plates, which are located outside the seed metering nozzles, and the plurality of first seed guide plates correspond one-to-one with the plurality of seed metering nozzles.

[0009] A pneumatic aspiration seeding device, comprising: A front cover assembly having a feed inlet; A rear cover assembly, the rear cover assembly including a rear cover body and a drive shaft, the rear cover body being connected to the front cover assembly, the drive shaft passing through the rear cover body, and the drive shaft being rotatable relative to the rear cover body; A seeding assembly, wherein the seeding assembly is located between the front end cover assembly and the rear end cover, and the seeding assembly, the front end cover assembly and the rear end cover form a cavity; A seed metering tray assembly, the seed metering tray assembly being the aforementioned seed metering tray assembly, the seed metering tray assembly being located between the front end cover assembly and the rear end cover assembly, the seed metering tray assembly being located within the sowing assembly, the seed metering tray assembly being connected to the drive shaft, the seed metering tray assembly dividing the cavity into a first chamber and a second chamber along the axial direction of the drive shaft, the first chamber being away from the front end cover assembly and being a negative pressure chamber, the seed metering nozzle being located within the second chamber and communicating with the first chamber.

[0010] Optionally, the front cover assembly includes: The front cover body has a feeding baffle on one side adjacent to the second chamber. The feeding baffle and the front cover body form a seed-taking area. The seed-discharging nozzle can enter and exit the seed-taking area to grab the seeds in the seed-taking area and transport the grabbed seeds to the sowing component. A seed cleaning spring is connected to the front cover body and is located in the second chamber. The seed cleaning spring is on the movement trajectory of the seed dispensing nozzle, and there is a preset distance between the seed cleaning spring and the seed dispensing nozzle.

[0011] Optionally, the front end cover assembly further includes a first seed-blocking component, a second seed-blocking component, and a third seed-blocking component arranged sequentially along the movement path of the seed metering nozzle. The first seed-blocking component includes a first fixing member and a first seed-blocking member. The first fixing member is connected to the feed baffle, and the first fixing member is provided with a through groove for the seeds to pass through. The first seed-blocking member is located in the through groove. The bottom of the feed baffle has an opening for the seed dispensing nozzle to enter the seed taking area. The second seed blocking component and the third seed blocking component are located on both sides of the opening. Both the second seed blocking component and the third seed blocking component include brushes, and the brushes of the second seed blocking component and the third seed blocking component are arranged alternately up and down along the height direction of the opening to seal the opening.

[0012] Optionally, the sowing assembly includes a sleeve and a sowing tray. The sleeve is fitted over the sowing tray and has multiple discharge ports. The sowing tray has multiple seed conveying channels. The inlets of the seed conveying channels are connected to the outlets of the first seed guide plate in the seed metering tray assembly, and the outlets of the seed conveying channels are connected to the discharge ports. Each of the multiple seed conveying channels corresponds one-to-one with one of the multiple discharge ports. And / or, the sowing assembly includes a sleeve and a sowing tray, the sleeve is fitted over the outside of the sowing tray, the sleeve has multiple discharge ports, the sowing tray has multiple seed conveying channels, and the sowing tray has multiple second seed guide plates on one side adjacent to the seed metering tray assembly, the multiple second seed guide plates correspond one-to-one with the multiple first seed guide plates in the seed metering tray assembly, and the end faces of the second seed guide plates and the first seed guide plates adjacent to the seed conveying channels are arranged flush.

[0013] Optionally, the seeding assembly further includes multiple seeding nozzles, each of which is connected to the sleeve and corresponds one-to-one with a plurality of discharge ports.

[0014] Optionally, the drive shaft is a hollow shaft, the drive shaft has an air inlet and multiple air outlets, the air outlets are located at one end of the drive shaft that extends into the first chamber, the multiple air outlets are arranged radially spaced along the drive shaft, and the air inlet is adapted to communicate with a negative pressure source.

[0015] Beneficial effects: (1) The outer end face of the seed metering nozzle of this application adopts an arc-shaped cavity that matches the shape of the special flat seed and is provided with a through hole, forming a "concave surface guidance + through hole adsorption" collaborative working mechanism. The concave surface of the arc-shaped cavity can effectively guide the seed to fit in a suitable posture, increase the contact area between a single seed and the arc-shaped cavity, thereby ensuring that the through hole has a sufficiently strong adsorption force, avoiding the problem of weak adsorption or falling off due to irregular seed shape, and greatly improving the single seed adsorption accuracy; at the same time, it effectively avoids the adsorption of multiple layers of seeds at the same time.

[0016] (2) The seed metering nozzle and the seed metering tray body of this application adopt a detachable connection method. The seed metering nozzle with an adaptable arc cavity can be replaced according to different seed shapes. Quick disassembly and assembly can be achieved through the mounting groove and mounting hole, adapting to the needs of different crop seeds and improving the versatility of the equipment. This design not only solves the adsorption problem of large flat seeds in the stacked state, but also achieves compatibility with seeds with different physical properties, effectively improving the seed metering accuracy and sowing efficiency. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 This is a schematic diagram of the structure of a seeding tray assembly provided according to some embodiments of this application; Figure 2 This is a schematic diagram of the separation structure between the seed metering disc body and the seed metering nozzle according to some embodiments of this application; Figure 3 This is a three-dimensional structural diagram of a seed metering nozzle provided according to some embodiments of this application; Figure 4 A cross-sectional view of a seed metering nozzle provided according to some embodiments of this application; Figure 5 An exploded view of a pneumatic seeding device provided according to some embodiments of this application; Figure 6 This is a schematic diagram of the structure of a front cover assembly provided according to some embodiments of this application; Figure 7 This is a schematic diagram of the structure of a first barrier component provided according to some embodiments of this application; Figure 8 This is a schematic diagram of the structure of the second and third seed-blocking components according to some embodiments of this application; Figure 9 This is a schematic diagram of the structure of a seeding assembly provided according to some embodiments of this application; Figure 10 This is a side sectional view of an air-suction seeding device provided according to some embodiments of this application.

[0018] Explanation of reference numerals in the attached figures: 1. Seed metering tray assembly; 11. Seed metering tray body; 111. Mounting groove; 112. Mounting hole; 12. Seed metering nozzle; 121. Arc-shaped cavity; 122. Central hole; 123. Peripheral hole; 124. Base part; 125. Working part; 13. Seed distribution tray; 14. First seed guide plate; 2. Front cover assembly; 21. Feed inlet; 22. Front cover body; 23. Feed baffle; 231. First arc-shaped plate; 232. Second arc-shaped plate; 24. Seed cleaning spring; 25. First seed blocking component; 251. First fixing component; 252. First seed blocking component; 253. Through groove; 26. Second seed blocking component; 27. Third seed blocking component; 28. Opening; 3. Rear end cover assembly; 31. Rear end cover body; 32. Drive shaft; 321. Air inlet; 322. Air outlet; 33. Annular ring plate; 4. Seeding assembly; 41. Sleeve; 42. Seeding tray; 43. Discharge port; 44. Seeding channel; 45. Second seed guide plate; 46. Seeding beak; 5. First chamber; 6. Second chamber. Detailed Implementation

[0019] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will understand that modifications and variations can be made to the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention should fall within the scope of protection of the embodiments of the present invention.

[0020] Compared to the limitations of individual seed adsorption in related technologies, this application proposes an adsorption concept based on the natural flat and stacked state of the seeds, and develops a flat seed air-suction seeder based on this natural stacking state. During operation, large, flat seeds enter the seed-collecting area of ​​the seeder through the feed pipe. Due to their flat and large-volume characteristics, they naturally form a multi-layered stacked structure. Traditional seeders struggle to adapt to this stacking characteristic, leading to frequent problems such as multiple seed adsorption and missed adsorption.

[0021] In one embodiment provided in this application, such as Figures 1-4 As shown, a seed metering disc assembly 1 includes a seed metering disc body 11 and six seed metering nozzles 12; The seed metering disc body 11 is circular. Six mounting slots 111 are evenly distributed around its axis on the seed metering disc body 11. The shape of the mounting slots 111 is the same as the cross-sectional shape of the working part of the seed metering nozzle 12, so that the seed metering nozzle 12 can be inserted into the mounting slots 111. Each mounting slot 111 has a mounting hole 112 at the bottom. The mounting slots 111 serve a positioning function.

[0022] The seed metering nozzle 12 is detachably connected to the seed metering disc body 11. The seed metering nozzle 12 is located in the mounting groove 111, and one end of the seed metering nozzle 12 extends into the mounting hole 112. Multiple seed metering nozzles 12 correspond one-to-one with multiple mounting grooves 111. The seed metering nozzle 12 is cylindrical and includes a base portion 124 and a working portion 125. Both the base portion 124 and the working portion 125 are cylindrical and coaxially connected. The interiors of the base portion 124 and the working portion 125 are hollow and interconnected. The outer surface of the base portion 124 is provided with external threads. The diameter of the base portion 124 is smaller than the diameter of the working portion. The base portion 124 of the seed metering nozzle 12 passes through the mounting hole 112 and is fixed and limited by a nut and a sealing gasket. The interior of the seed metering nozzle 12 is hollow, and the outer end face of the working portion 125 of the seed metering nozzle 12 is an inwardly recessed arc-shaped cavity 121. The bottom of the arc-shaped cavity 121 has a through hole communicating with the interior of the seed metering nozzle 12. Furthermore, the seed metering nozzle 12 and the seed metering disc body 11 of this application are connected by a threaded connection through the base part 124. The concave structure of the seed metering nozzle 12 can be replaced according to different seeds. That is, the concave structure of each set of seed metering nozzles 12 can be appropriately adjusted according to the shape of the seeds, thereby improving the versatility of the equipment.

[0023] There are five through holes, consisting of a central hole 122 and four peripheral holes 123. The central hole 122 is located at the center of the bottom surface inside the arc-shaped cavity 121, and the four peripheral holes 123 are evenly spaced around the central hole 122. This arrangement of the central hole 122 and the four peripheral holes 123 increases the adsorption area of ​​the through holes, allowing for better adaptation to flat seeds and a larger adsorption area. The diameter of the central hole 122 is larger than that of the peripheral holes 123. This is mainly because the center of gravity of the flat seeds is central; therefore, the larger diameter of the central hole 122 results in stronger adsorption force and better adsorption of flat seeds.

[0024] It also includes a seeding disc 13, which is annular. The outer diameter of the minute disc is larger than the outer diameter of the seed metering disc body 11. The seeding disc 13 surrounds the outer periphery of the seed metering disc body 11, and the seed metering disc body 11 is rotatable relative to the seeding disc 13. A circular groove is formed at the inner edge of the minute disc corresponding to the outer edge of the seed metering disc body 11. The outer diameter of the seed metering disc body 11 matches the outer diameter of the groove, and the seed metering disc body 11 is inserted into the groove. A sealing ring is provided at the overlapping part of the seed metering disc body 11 and the minute disc. The seeding disc 13 is provided with six first seed guide plates 14, which are located outside the seed metering nozzles 12, and the six first seed guide plates 14 correspond one-to-one with the six seed metering nozzles 12. The radial width of the first seed guide plates 14 is the same as the circumference width of the seeding disc 13.

[0025] A pneumatic seeding device includes a front cover assembly 2, a rear cover assembly 31, a seeding assembly 4, and a seed metering tray assembly 1; The seed metering tray assembly 1 is the seed metering tray assembly 1 mentioned above. The seed metering tray assembly 1 is located between the front cover assembly 2 and the rear cover assembly 31. The seed metering tray assembly 1 is located inside the sowing assembly 4. The seed metering tray assembly 1 is connected to the drive shaft 32. The seed metering tray assembly 1 divides the cavity into a first chamber 5 and a second chamber 6 in the axial direction of the drive shaft 32. The first chamber 5 is far away from the front cover assembly 2 and is a negative pressure chamber. The seed metering nozzle 12 is located in the second chamber 6 and is connected to the first chamber 5.

[0026] The front cover assembly 2 has a feed inlet 21; the feed inlet 21 is connected to a rubber bend, which may include a vertical part and an inclined part. When sowing, the vertical part faces upward, and the inclined part communicates with the feed inlet 21. The front cover assembly 2 includes a front cover body 22 and a seed cleaning spring 24. A feed baffle 23 is provided on one side of the front cover body 22 adjacent to the second chamber 6. The feed baffle 23 includes two arc-shaped plates 231 and 232 located at different positions on the front cover body 22. The first arc-shaped plate 231 and the second arc-shaped plate 232 are arranged around the circumference of the front cover body 22. The main body of the first arc-shaped plate 231 is located in the area below the feed inlet 21, and the second arc-shaped plate 232 is located above the first arc-shaped plate. The front end of the second arc-shaped plate 232 is vertically aligned with the end of the first arc-shaped plate 231, forming an opening 28 between them for the seed dispensing nozzle 12 to enter the seed taking area.

[0027] The end face of the first arc-shaped plate 231 is a downwardly inclined plane that serves as a guide. The thickness of the end face is greater than that of the front face. A raised baffle 233 extends upward from the end face of the plane to provide a buffer. The feed baffle 23 and the front cover body 22 form a seed-collecting area. Seeds entering through the feed inlet 21 fall into the seed-collecting area. The seed-discharging nozzle 12 can enter and exit the seed-collecting area to grab the seeds under negative pressure and transport them to the sowing component 4. The seed-cleaning spring 24 is connected to the front cover body 22 and is located in the second chamber 6. The seed-cleaning spring 24 is located at the movement trajectory of the seed-discharging nozzle 12, and there is a preset distance between the seed-cleaning spring 24 and the seed-discharging nozzle 12. This preset distance is greater than the thickness of the average flat seed and less than twice the thickness of the average flat seed. This setting allows a single seed to pass through easily while removing two stacked seeds, ensuring accurate seed collection. A small mounting groove 111 is provided on the front cover body 22 corresponding to the position of the seed cleaning spring 24. The position of the seed cleaning spring 24 in the mounting groove 111 is adjustable, thereby adjusting the preset distance between the seed cleaning spring 24 and the seed dispensing nozzle 12. The seed cleaning spring 24 and the seed dispensing nozzle 12 do not contact each other when only one seed is adsorbed. When the seed dispensing nozzle 12 has a stacked seed layer adsorbed, as it rotates with the seed picking tray, the stacked seed layer first collides and rubs against the seed cleaning spring 24 to ensure that the seed dispensing nozzle 12 retains only one seed, avoiding seed stacking in the adsorption hole. In addition, the position of the seed cleaning spring 24 in the mounting groove 111 is adjustable, and the preset distance can be adjusted according to the seed adsorption situation. The front cover assembly 2 also includes a first seed blocking component 25, a second seed blocking component 26 and a third seed blocking component 27 arranged sequentially along the movement path of the seed metering nozzle 12.

[0028] The first seed-blocking component 25 is located on the outside of the arc-shaped plate, along the movement trajectory of the seed-discharging nozzle 12, ensuring that only a single seed is scraped off by the seed-discharging nozzle 12, reducing reseeding or missed seeding. The first seed-blocking component 25 includes a first fixing member 251 and a first seed-blocking member 252. The first fixing member 251 includes a double-layered rigid fixing plate, which can be made of hard plastic or metal. The first seed-blocking member 252 is a flexible rubber sheet, which is set between the double-layered rigid fixing plates to form a composite plate structure. The first fixing member 251 is connected to the feed baffle 23. The first fixing member 251 has a U-shaped through groove 253 for seed passage. The first seed-blocking member 252 is located in the through groove 253. The first seed-blocking member 252 also has a channel for the seed-discharging nozzle 12 to pass through, but the size of this channel is smaller than the size of the through groove 253, ensuring that the seed only contacts the first seed-blocking member 252 when passing through the first seed-blocking component 25. When the seed-carrying nozzle 12 passes the seed-feeding position of the first seed-blocking component 25, the seed first contacts the flexible rubber sheet of the first seed-blocking component 252 in the composite structure and is scraped off the seed-feeding nozzle 12 under low impact force. The composite structure adopts a sandwich design of "rigid outer layer - rubber interlayer - rigid inner layer" and is fixed to the front cover body 22 by screws. This design can effectively protect the integrity of the seed. The rubber layer buffers the impact force of scraping the seed and avoids mechanical damage. The double-layered rigid fixing plate enhances the structural rigidity, and the rigid outer layer supports and ensures the stability of the seed cleaning action; efficient seed cleaning.

[0029] The bottom of the feed baffle 23, where the first arc-shaped plate 231 and the second arc-shaped plate 232 are aligned, has an opening 28 for the seed dispensing nozzle 12 to enter the seed-taking area. The second seed-blocking component 26 and the third seed-blocking component 27 are located on either side of the opening 28. Both the second seed-blocking component 26 and the third seed-blocking component 27 include brushes, and the brushes of the second seed-blocking component 26 and the third seed-blocking component 27 are arranged alternately up and down along the height of the opening to seal it. The double brush arrangement in the second seed-blocking component 26 and the third seed-blocking component 27 provides a double seal for the opening 28, preventing seeds from falling into the seeder through the brushes when the seed dispensing nozzle 12 enters the seed-taking area, thus affecting accurate sowing. The brush of the second seed-blocking component 26 is located in the seed-taking area. The length of the brush of the second seed-blocking component 26 is shorter than the length of the brush of the third seed-blocking component 27, but the density of the brush of the second seed-blocking component 26 is greater than the density of the brush of the third seed-blocking component 27. With this configuration, the brush of the second seed-blocking component 26 is located in the seed-collecting area, so it is in direct contact with the stacked seeds. Therefore, the brush should not be too long, and the higher density configuration ensures the strength of the brush and prevents the stacked seeds from pushing the brush open, forming a physical barrier that prevents the seeds from moving towards the slot.

[0030] The third seed-blocking component 27 is equipped with two rows of brushes. The brushes of the third seed-blocking component 27 are close to the outer end of the slot, and the brushes are staggered and wear-resistant to further seal the gap and completely prevent the seeds from falling through the slot.

[0031] The rear cover assembly 3 includes a rear cover body 31 and a drive shaft 32. The rear cover body 31 is fixedly connected to the front cover body 22 by bolts. An annular ring plate 33 is provided on the side of the rear cover body 31 near the seed metering tray body 11. The annular ring plate 33 fits in close contact with the seed metering tray body 11. The connection between the annular ring plate 33 and the seed metering tray body 11 adopts a high-precision sealing ring pressure plate to completely eliminate friction loss and air pressure leakage caused by the relative movement of the sealing components, ensuring a small negative pressure fluctuation range and guaranteeing high stability and accuracy throughout the seed suction and metering process. The annular ring plate 33 and the seed metering tray body 11 form a first chamber 5. The drive shaft 32 passes through the rear cover 31 and is rotatable relative to the rear cover body 31. The drive shaft 32 and the rear cover body 31 are connected by bearings. The drive shaft 32 is connected to the seed metering disc body 11 and drives the seed metering disc body 11 to rotate synchronously. The end of the drive shaft 32 near the front cover body 22 is coaxially connected to a limiting threaded shaft. The limiting threaded shaft and the drive shaft 32 are connected by threads. A rotating sleeve is provided in the center of the front cover body 22. The limiting threaded shaft is rotated inside the rotating sleeve. A limiting block is provided at the end of the limiting threaded shaft outside the front cover body 22. The drive shaft 32 drives the limiting threaded shaft to rotate synchronously, while the limiting threaded shaft rotates inside the rotating sleeve. The limiting block forms a pressing and limiting effect on the front cover body 22. At the same time, the limiting threaded shaft also provides support for the drive shaft 32. The end face of the drive shaft 32 connected to the seed metering disc body 11 is provided with a stepped groove. The stepped groove facilitates quick installation and positioning between the seed metering disc body 11 and the drive shaft 32, and has airtightness, ensuring a stable negative pressure environment in the first chamber 5. The drive shaft 32 is a hollow shaft with an air inlet 321 and multiple air outlets 322. The air outlets 322 are located at the end of the drive shaft 32 that extends into the first chamber 5 and are connected to the first chamber 5. The multiple air outlets 322 are arranged radially at intervals along the drive shaft 32. The air inlet 321 is located at one axial end of the drive shaft 32 and is suitable for connecting to a negative pressure source. The drive mechanism drives the drive shaft 32 to rotate, and at the same time, a suction negative pressure is generated in the hollow part of the drive shaft 32 through the negative pressure source.

[0032] The sowing component 4 is located between the front cover component 2 and the rear cover 31, and the sowing component 4, the front cover component 2, and the rear cover 31 form a cavity. The sowing component 4 includes a sleeve 41 and a sowing disc 42. The sowing disc 42 is an annular cylinder, and the sleeve 41 is fitted over the outside of the sowing disc 42. The sleeve 41 has multiple discharge ports 43. The sowing disc 42 has multiple seed conveying channels 44. The inlet of the seed conveying channel 44 is connected to the outlet end of the first seed guide plate 14 in the seed metering disc component 1, and the outlet of the seed conveying channel 44 is connected to the discharge port 43. The multiple seed conveying channels 44 correspond one-to-one with the multiple discharge ports 43. When the seed metering nozzle 12 that adsorbs seeds rotates to the first seed blocking component 25, the scraped seeds fall vertically into the seed conveying channel 44, are then transported through the seed conveying channel 44 to the discharge port 43, and finally fall onto the sowing duckbill 46, completing the precise sowing.

[0033] The sowing assembly 4 also includes multiple sowing nozzles 46, which are connected to the sleeve 41 respectively, and each sowing nozzle 46 corresponds to a multiple discharge port 43. The sowing nozzles 46 are L-shaped, and the bent part of the sowing nozzle 46 is hinged to the opposite side wall of the discharge port 43. One end of the sowing nozzle 46 is located at the discharge port 43 to block the discharge port 43, and the other end is connected to the outer wall of the sleeve 41 with a compression spring. So when the sowing nozzle 46 contacts the ground, it is squeezed and flipped, expelling the seeds from the discharge port 43. Under the action of the compression spring, the sowing nozzle 46 returns to its original position to continue blocking the discharge port 43.

[0034] In another embodiment of this application, the difference between this embodiment and other embodiments is that the sowing component 4 includes a sleeve 41 and a sowing tray 42. The sleeve 41 is fitted over the outside of the sowing tray 42 and has multiple discharge ports 43. The sowing tray 42 has multiple seed conveying channels 44. Multiple second seed guide plates 45 are provided on the side of the sowing tray 42 adjacent to the seed metering tray assembly 1. Each of the multiple second seed guide plates 45 corresponds one-to-one with a multiple first seed guide plates 14 in the seed metering tray assembly 1, and the end faces of the second seed guide plates 45 and the first seed guide plates 14 adjacent to the seed conveying channels 44 are arranged flush. Through the cooperation of the second seed guide plates 45 and the first seed guide plates 14, seeds can be guided more accurately into the seed conveying channels 44, improving the accuracy of single-seed sowing.

[0035] In another embodiment of this application, the difference between this embodiment and other embodiments is that the first fixing member 251 can be a column located outside the second arc-shaped plate 232, the column is made of rigid material, and the first seed-blocking member 252 is an elastic protrusion. The first fixing member 251 is embedded with the first seed-blocking member 252 on the side facing the seed outlet 12. With this configuration, the structure of the first seed-blocking component 25 is simpler, easier to assemble and disassemble, and production costs are reduced.

[0036] The working process and principle of the above structure are as follows: Powered by a fan, the hollow drive shaft 32 creates a negative pressure environment in the first chamber 5, forming a pressure difference inside and outside the seed dispensing tray, laying the foundation for precise sowing. Seeds enter the feed baffle 23 through the feed inlet 21, forming a seed-collecting area. Utilizing the characteristic of large, flat seeds naturally accumulating in a flat position, the arc-shaped cavity 121 on the outer end face of the seed dispensing nozzle 12 guides the seeds to adhere in an ideal posture. The six through-hole structure achieves single-seed adsorption through precise negative pressure distribution, effectively avoiding multi-seed adsorption and significantly improving adsorption accuracy. As the seed metering disc rotates, the seeds first collide and rub against the cylindrical seed-cleaning spring 24, ensuring that only one seed is retained in each suction hole. When a single seed moves to the seed-dropping area, the suction state is safely released by the seed-cleaning baffle of the composite structure of the first seed-blocking component 25. The seeds detached from the seed metering nozzle 12 fall to the seed-distributing disc 13 under the action of gravity and inertial centrifugal force. The seed-distributing disc 13 rotates synchronously with the first seed-guiding plate 14, reducing the seed deviation path and allowing the seeds to smoothly enter the seed conveying channel 44 of the sowing disc 42 to complete the first sowing. Subsequently, the seeds slide along the inner wall of the sleeve 41 and fall into the discharge port 43. When they move to the vertical position, they overcome the friction of the seed channel wall and fall into the inner cavity of the sowing duckbill 46 in advance to await final sowing. During the sowing operation, the moment the hole-forming device breaks through the film and enters the soil to open the hole, the movable sowing duckbill 46 is pressed open, and the seed then falls accurately into the planting hole, completing a complete sowing cycle. In addition, the seed metering disc and drive shaft 32 are fixedly connected and rotate synchronously, which completely eliminates the friction loss caused by the relative movement of the sealing gasket, reduces air pressure loss, provides stable negative pressure for the entire workflow, ensures high precision and stability of the entire seed suction and metering process, and realizes precise seed collection, accurate seeding, secondary seeding and precision hole sowing of large flat seeds.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A seed metering disc assembly, characterized in that, include: The seed metering tray body has multiple mounting slots, and the bottom of the mounting slots has mounting holes; Multiple seed metering nozzles are provided, each detachably connected to the seed metering disc body. At least a portion of each seed metering nozzle is located within a mounting groove, with one end extending into a mounting hole. Each seed metering nozzle corresponds one-to-one with a specific mounting groove. The seed metering nozzle is hollow inside, and the outer end face of the seed metering nozzle is an inwardly concave arc-shaped cavity. The bottom of the arc-shaped cavity has a through hole that communicates with the inside of the seed metering nozzle.

2. The seed metering disc assembly according to claim 1, characterized in that, The number of through holes is multiple, and the multiple through holes are divided into a central hole and multiple peripheral holes. The central hole is located at the center of the bottom surface of the arc-shaped cavity, and the multiple peripheral holes are arranged at even intervals around the central hole.

3. The seed metering disc assembly according to claim 2, characterized in that, The diameter of the central hole is larger than the diameter of the peripheral holes.

4. The seed metering disc assembly according to claim 1, characterized in that, It also includes a seeding disc, which surrounds the periphery of the seed metering disc body and the seed metering disc body is rotatable relative to the seeding disc. The seeding disc is provided with a plurality of first seed guide plates, which are located outside the seed metering nozzles, and the plurality of first seed guide plates correspond one-to-one with the plurality of seed metering nozzles.

5. A pneumatic suction-type seeding device, characterized in that, include: A front cover assembly having a feed inlet; A rear cover assembly, the rear cover assembly including a rear cover body and a drive shaft, the rear cover body being connected to the front cover assembly, the drive shaft passing through the rear cover body, and the drive shaft being rotatable relative to the rear cover body; A seeding assembly, wherein the seeding assembly is located between the front end cover assembly and the rear end cover, and the seeding assembly, the front end cover assembly and the rear end cover form a cavity; A seed metering tray assembly, wherein the seed metering tray assembly is any one of claims 1-4, the seed metering tray assembly is located between the front end cover assembly and the rear end cover assembly, the seed metering tray assembly is located inside the sowing assembly, the seed metering tray assembly is connected to the drive shaft, the seed metering tray assembly divides the cavity into a first chamber and a second chamber in the axial direction of the drive shaft, the first chamber is away from the front end cover assembly and is a negative pressure chamber, the seed metering nozzle is located in the second chamber and communicates with the first chamber.

6. The air-suction seeding device according to claim 5, characterized in that, The front cover assembly includes: The front cover body has a feeding baffle on one side adjacent to the second chamber. The feeding baffle and the front cover body form a seed-taking area. The seed-discharging nozzle can enter and exit the seed-taking area to grab the seeds in the seed-taking area and transport the grabbed seeds to the sowing component. A seed cleaning spring is connected to the front cover body and is located in the second chamber. The seed cleaning spring is on the movement trajectory of the seed dispensing nozzle, and there is a preset distance between the seed cleaning spring and the seed dispensing nozzle.

7. The air-suction seeding device according to claim 6, characterized in that, The front end cover assembly further includes a first seed-blocking component, a second seed-blocking component, and a third seed-blocking component arranged sequentially along the movement path of the seed metering nozzle. The first seed-blocking component includes a first fixing member and a first seed-blocking member. The first fixing member is connected to the feed baffle, and the first fixing member has a through groove for the seeds to pass through. The first seed-blocking member is located in the through groove. The bottom of the feed baffle has an opening for the seed dispensing nozzle to enter the seed taking area. The second seed blocking component and the third seed blocking component are located on both sides of the opening. Both the second seed blocking component and the third seed blocking component include brushes, and the brushes of the second seed blocking component and the third seed blocking component are arranged alternately up and down along the height direction of the opening to seal the opening.

8. The air-suction seeding device according to claim 5, characterized in that, The seeding assembly includes a sleeve and a seeding tray. The sleeve is fitted over the seeding tray and has multiple discharge ports. The seeding tray has multiple seed conveying channels. The inlets of the seed conveying channels are connected to the outlets of the first seed guide plate in the seed metering tray assembly, and the outlets of the seed conveying channels are connected to the discharge ports. Each seed conveying channel corresponds one-to-one with one of the discharge ports. And / or, the sowing assembly includes a sleeve and a sowing tray, the sleeve is fitted over the outside of the sowing tray, the sleeve has multiple discharge ports, the sowing tray has multiple seed conveying channels, and the sowing tray has multiple second seed guide plates on one side adjacent to the seed metering tray assembly, the multiple second seed guide plates correspond one-to-one with the multiple first seed guide plates in the seed metering tray assembly, and the end faces of the second seed guide plates and the first seed guide plates adjacent to the seed conveying channels are arranged flush.

9. The air-suction seeding device according to claim 8, characterized in that, The seeding assembly also includes multiple seeding nozzles, which are respectively connected to the sleeve, and each seeding nozzle corresponds to one of the multiple discharge ports.

10. The air-suction seeding device according to any one of claims 5-9, characterized in that, The drive shaft is a hollow shaft with an air inlet and multiple air outlets. The air outlets are located at the end of the drive shaft that extends into the first chamber. The multiple air outlets are arranged at radial intervals along the drive shaft. The air inlet is adapted to communicate with a negative pressure source.

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