A boss parallel suction hole type seed meter

Abstract

A parallel suction-hole type seed metering device with protrusions, relating to the field of agricultural machinery technology, includes a front housing, a front fixed plate, a seed metering disc, a rear baffle, a duckbill ring frame, a rear fixed plate, and an air tube shaft. The front housing is a disc with an opening, fixedly sleeved on the air tube shaft. A rotatable rear baffle is sleeved on the air tube shaft. The front fixed plate is rotatably coaxially sleeved on the front housing, and the rear fixed plate is coaxially sleeved on the rear baffle. A duckbill ring frame with a duckbill is sandwiched between the two. The device consists of an outer shell. Inside the device, the air tube shaft is sleeved with a seed metering disc fixedly connected to the rear baffle. On the side of the seed metering disc near the front housing, multiple sets of frustum-shaped protrusions are arranged in a circular pattern to suction and screen seeds to the duckbill. The seed metering disc of this invention has protrusions with suction ports parallel to the rotation direction of the seed metering disc for seed suction. Compared with traditional seed metering discs that use ventilation holes to suction seeds, this significantly improves the suction and screening performance of the seed metering device and expands its application range.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a boss-type parallel suction hole seed metering device. Background Technology

[0002] The air suction seed metering device is an agricultural device that uses an air suction device to generate negative pressure, adsorbing seeds onto a special seed metering tray, and then releasing the negative pressure at a specific location to achieve seed release and sowing. It can effectively separate individual seeds and accurately sow seeds into the soil according to preset plant spacing and depth. It has the advantages of low missed sowing and reseeding rates and can effectively reduce seed breakage rate. It has been widely used in modern agricultural production.

[0003] However, traditional air-suction seed metering devices are prone to problems such as unstable adsorption posture, multiple adsorption, or missed adsorption when sowing irregularly shaped seeds like corn seeds. This is because the seeds are flat, have a shifted center of gravity, and have a small surface contact area. As a result, the seed metering intervals are uneven and the sowing accuracy is reduced. Existing flat or grooved seed metering discs are difficult to effectively control seed orientation and airflow distribution. Especially at high speeds, the turbulence effect is aggravated, and the risk of seed loss is significantly increased. Summary of the Invention

[0004] Therefore, the present invention aims to provide a seed metering device with a raised parallel suction hole, which is equipped with a raised surface that can actively guide the airflow direction to adsorb seeds, effectively enhancing the support and adsorption stability of the seeds, and achieving efficient and precise seed transport.

[0005] To solve at least one of the above-mentioned technical problems, the technical solution provided by the present invention is:

[0006] A parallel suction hole type seed metering device with a boss includes a front shell, a front fixing plate, a seed metering plate, a rear baffle, a duckbill ring frame, a rear fixing plate, and an air tube shaft, wherein...

[0007] The front shell is a disc with an inlet, which is fixedly fitted on a tubular tracheal shaft. A rotatable disc-shaped rear baffle is fitted on the side of the tracheal shaft away from the front shell.

[0008] Both the front and rear fixed plates are annular plate structures. The front fixed plate is rotatably and coaxially sleeved on the front housing, and the rear fixed plate is coaxially sleeved on the rear baffle. A duckbill ring frame is detachably and coaxially clamped between the front and rear fixed plates, so that the front housing, the front fixed plate, the rear baffle, the duckbill ring frame, and the rear fixed plate can form a circular sealed container with the tracheal shaft extending into it as the central axis.

[0009] A seed metering disc is fitted onto the air tube shaft inside the sealed container. The seed metering disc is detachably fixed to the rear baffle. On the side of the seed metering disc near the front shell, there are multiple sets of four-sided frustum-shaped protrusions that can perform air suction screening of seeds. The protrusions are distributed in a ring-like pattern at intervals. The tip of the protrusion is in the same direction as the linear velocity of the ring it belongs to when it rotates. An inner tube is provided inside the protrusion to connect the tip of the protrusion and the side of the seed metering disc away from the front shell. When the side of the seed metering disc without protrusions is kept under negative pressure and the seed metering disc rotates, the seed metering disc can deliver the seeds that have been put into the sealed container through the front shell to the beak of the beak ring frame through the protrusions.

[0010] In one embodiment of the present invention, the front housing is provided with a seed receiving plate and a seed receiving wall adjacent to the seed receiving plate on the side close to the seed receiving plate, wherein the seed receiving plate and the seed receiving wall form a "V" shaped structure, the low point of the "V" shaped structure is located below the seed inlet, the seed receiving plate is provided with a seed receiving plate through hole that allows the boss to pass through, and a through hole brush is provided in the seed receiving plate through hole.

[0011] The front shell is also equipped with a seed brush and a seed screening block on the side near the seed metering tray. The ring where the boss is located can pass through the through hole of the seed receiving plate and the seed brush. The seed screening block is adjacent to the ring where the boss is located and can screen out the excess seeds adsorbed on the boss.

[0012] The front shell is provided with a seed outlet, which is located below the seed receiving plate.

[0013] Furthermore, the distance between the seed-bearing plate and the seed-bearing wall and the seed-dispensing tray is no more than 0.5 mm.

[0014] One embodiment of the present invention is that the seed inlet is provided with a seed feeding hopper facing outwards from the seed metering device.

[0015] In one embodiment of the present invention, a seed metering disc limiting frame is detachably fixedly provided on the side of the rear baffle near the seed metering disc, wherein the seed metering disc limiting frame is a set of intermittently convex rings pointing to the center, and the seed metering disc is coaxially engaged between the seed metering disc limiting clip and the rear baffle.

[0016] Furthermore, an air chamber block is fixedly installed on the air pipe shaft between the rear baffle and the seed metering tray. The air chamber block is located between the seed receiving plate and the seed brush. It can contact the surface of the seed metering tray on the side without the protrusion, and the ring where the protrusion is located can pass through the air chamber block.

[0017] Furthermore, the duckbill ring frame has multiple sets of duckbill rings spaced apart on its side surface, and the inlet of the duckbill can communicate with the seed outlet.

[0018] One embodiment of the present invention is that the air tube shaft is a hollow shaft, and a through hole is provided in the part between the seed metering disc and the rear baffle.

[0019] The technical effects achieved by this invention are:

[0020] 1. The seed metering disc of the present invention is provided with a protrusion with an adsorption port parallel to the rotation direction of the seed metering disc for adsorbing seeds. Compared with the traditional seed metering disc that uses air holes to adsorb seeds, the protrusion can change the airflow direction, thereby applying sufficient adsorption and support force to the seeds in the direction of movement. This effectively optimizes the stress state of the seeds in key stages such as seed filling and seed cleaning, significantly improves the adsorption and screening performance of the seed metering device, and enables the seed metering device to effectively adsorb irregularly shaped seeds, thus expanding the application range of the seed metering device.

[0021] 2. The seed metering device in this invention is equipped with a duckbill structure, which can roll in the soil to create holes for sowing while metering seeds, realizing the integrated operation of metering and sowing, and effectively improving sowing efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is an isometric view of the overall device in this invention;

[0024] Figure 2 This is an exploded view of the overall device in this invention;

[0025] Figure 3 This is a schematic diagram of the back side of the front housing in this invention;

[0026] Figure 4 This is an isometric view of the seed metering disc in this invention;

[0027] Figure 5 This is a perspective view of the boss in this invention;

[0028] Figure 6 This is a schematic diagram of the device for removing the front housing in this invention;

[0029] Figure 7 This is a schematic diagram showing the positions of the duckbill ring frame, the rear baffle, and the seed metering tray limiting frame in this invention;

[0030] Figure 8 This is an isometric view of the duckbill ring frame in this invention;

[0031] Figure 9 In diagram a, we have a force analysis diagram of the parallel adsorption of the conventional air-suction seed metering device described in this invention.

[0032] Figure 9 Figure b is a force analysis diagram of the traditional air-suction seed metering device described in this invention during vertical adsorption;

[0033] Figure 10 This is an airflow distribution diagram of the boss during seed dispensing in this invention;

[0034] Figure 11 This is a schematic diagram showing the division of the seed supply area within this invention;

[0035] In the diagram, 100-seed inlet hopper, 200-front shell, 201-seed inlet, 202-seed receiving plate, 203-seed receiving plate through hole, 204-through hole brush, 205-seed receiving wall, 206-seed brush, 207-seed sieve block, 208-seed outlet, 300-front fixing plate, 400-seed metering plate, 401-protrusion, 402-inner tube, 500-seed metering plate limiting frame, 600-rear baffle, 601-air chamber baffle, 700-duckbill ring frame, 701-duckbill, 800-rear fixing plate, 900-air pipe shaft, a-seed filling area, b-seed cleaning area, c-seed carrying area, d-seed unloading area. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0038] See Figure 1 , Figure 2 A type of seed metering device with parallel suction holes and protrusions includes a front housing 200, a front fixing plate 300, a seed metering plate 400, a rear baffle 600, a duckbill ring frame 700, a rear fixing plate 800, and an air tube shaft 900, wherein...

[0039] The front housing 200 is a disc with a seed inlet 201 on its surface, which is fixedly sleeved on the tubular air shaft 900. In some embodiments, a seed inlet hopper 100 facing the outside of the seed metering device is provided at the seed inlet 201, so that the seeds can be quickly introduced into the seed metering device by the seed inlet hopper 100.

[0040] A rotatable disc-shaped rear baffle 600 is fitted onto the side of the tracheal shaft 900 away from the front housing 200. The tracheal shaft 900 is a fixed shaft, its functions including supplying air and supporting rotation. Relative to the front housing 200, which is fixed to the tracheal shaft 900 and cannot rotate, it is combined with... Figure 7 As can be seen, the rear baffle 600 is located at the farthest end of the tracheal shaft 900 and can rotate around the tracheal shaft 900.

[0041] Both the front fixed plate 300 and the rear fixed plate 800 are annular plate structures. The front fixed plate 300 is rotatably and coaxially sleeved on the front housing 200, and the rear fixed plate 800 is coaxially sleeved on the rear baffle 600. A duckbill ring frame 700 is detachably and coaxially clamped between the front fixed plate 300 and the rear fixed plate 800, allowing the front housing 200, front fixed plate 300, rear baffle 600, duckbill ring frame 700, and rear fixed plate 800 to form a circular sealed container with a tracheal shaft 900 extending into it as the central axis. Simultaneously, combined with... Figure 8 As can be seen, when the seed metering device moves on the ground, the duckbill 701 on the duckbill ring frame 700 is affected by the contact force of the ground, which will drive the duckbill ring frame 700, the front fixed plate 300, and the rear fixed plate 800 to rotate synchronously. The rear baffle 600 will also rotate synchronously under the drive of the rear fixed plate 800. The structure and functional implementation of the duckbill 701 can refer to the existing technology and are not particularly limited here.

[0042] See Figure 4 , 6 Inside the sealed container, a seed metering disc 400 is fitted onto the air tube shaft 900. The seed metering disc 400 is detachably and fixedly connected to the rear baffle 600. The fixing method is mainly implemented by a seed metering disc limiting bracket 500 detachably fixed on one side near the seed metering disc 400. The seed metering disc limiting bracket 500 is a ring with multiple sets of spaced inwardly protruding rings pointing to the center. It can be connected and fixed to the rear baffle 600 by bolts or other means, thereby coaxially clamping the seed metering disc 400 between the seed metering disc limiting bracket 500 and the rear baffle 600. As can be seen from the above, when the rear baffle 600 rotates, the seed disc limiting bracket 500 and the seed metering disc 400 will also rotate synchronously, thereby providing power for the rotation and seed selection of the seed metering disc 400.

[0043] See Figure 3 The front housing 200 has a seed-bearing plate 202 and a seed-bearing wall 205 adjacent to the seed-bearing tray 400 on the side close to the seed-bearing tray 400. Preferably, the seed-bearing plate 202 and the seed-bearing wall 205 should be as close as possible to the seed-bearing tray 400 without affecting the normal rotation of the seed-bearing tray 400. Therefore, the distance between the seed-bearing plate 202 and the seed-bearing wall 205 and the seed-bearing tray 400 is controlled within 0.5mm.

[0044] In the front shell 200, the seed-bearing plate 202 and the seed-bearing wall 205 form a "V" shaped structure. The lowest point of the "V" shaped structure is located below the seed inlet 201. Since the seed-bearing plate 202 and the seed-bearing wall 205 are close enough to the seed metering tray 400, it can be seen that the seed-bearing plate 202, the seed-bearing wall 205, and the seed metering tray 400 actually form a "V" shaped container. The seeds introduced from the seed inlet 201 will be temporarily stored in this "V" shaped container. As the seed metering tray 400 rotates, the seeds in the "V" shaped container will also be removed from the container by the seed selection structure.

[0045] Combination Figure 4 , Figure 5 As can be seen, the seed metering disc 400 has multiple sets of frustum-shaped protrusions 401 on the side near the front shell 200, which are capable of air-sifting the seeds. The protrusions 401 are distributed in a ring-like manner, and the tip of the protrusion 401 is in the same direction as the linear velocity of the ring it is in when it rotates. The inside of the protrusion 401 is provided with an inner tube 402 that connects the tip of the protrusion 401 and the side of the seed metering disc 400 away from the front shell 200. When the side of the seed metering disc 400 without the protrusions 401 is kept under negative pressure and the seed metering disc 400 is rotating, the seed metering disc 400 can deliver the seeds that have been put into the sealed container by the front shell 200 to the duckbill 701 of the duckbill ring frame 700 through the protrusions 401.

[0046] Under negative pressure, the tip of the boss 401 can effectively adsorb the seeds stored in the "V" shaped container. When the boss 401 rotates with the seed metering disc 400, the direction of the seed's movement is the same as the direction of the movement of the tip of the boss 401, which is the direction of the linear velocity of the ring it is in. In addition to the adsorption force of the tip of the boss 401, the seed can also be supported by the tip of the boss 401, so that the seed can be adsorbed on the boss 401 very stably.

[0047] Also see Figure 3The seed-bearing plate 202 is provided with a seed-bearing plate through hole 203 that allows the boss 401 to pass through. A through-hole brush 204 is provided in the seed-bearing plate through hole 203. The front housing 200 is also provided with a seed brush 206 and a seed screening block 207 on the side near the seed dispensing disc 400. The ring where the boss 401 is located can pass through the seed-bearing plate through hole 203 and the seed brush 206. The seed screening block 207 is adjacent to the ring where the boss 401 is located and can screen out excess seeds adsorbed on the boss 401. When the seed dispensing disc 400 rotates... When in motion, the boss 401 can pass through the seed-bearing plate through-hole 203 and the seed brush 206. The main function of the seed-bearing plate through-hole 203 is to allow the boss 401 to pass through. In order to prevent the seeds from falling into the seed-bearing plate 202 by themselves through the seed-bearing plate through-hole 203, a through-hole brush 204 composed of elastic elements is also provided in the seed-bearing plate through-hole 203. It allows the boss 401 to rotate through. After the boss 401 rotates through, the through-hole brush 204 will support the seeds in the "V" shaped container.

[0048] The function of the seed brush 206 is to clean the seeds adsorbed and carried by the protrusion 401. When the protrusion 401 passes through the seed brush 206, the seeds can also be cleaned by the seed brush 206.

[0049] The seed screening block 207 can refer to similar seed screening equipment in the prior art. Its main purpose is to disperse the seeds that are stuck together, ensuring that each boss 401 transports only a single seed.

[0050] In addition, a seed outlet 208 is provided on the front shell 200. The seed outlet 208 is located below the seed receiving plate 202. After the boss 401 adsorbs the seeds and moves them above the seed outlet 208, it will lose its adsorption force due to the influence of the air chamber baffle 601. At this time, the seeds will fall off the boss 401, fall into the duckbill ring frame 700 along the seed outlet 208, and further enter the duckbill 701 located below, thus being sown in the soil.

[0051] The component used to release the adsorption force of the boss 401—the air chamber baffle 601—is located between the seed receiving plate 202 and the seed brush 206, that is, below the seed receiving plate 202. The air chamber baffle 601 is fixedly mounted on the air tube shaft 900 between the rear baffle 600 and the seed dispensing tray 400, and does not rotate with the seed dispensing tray 400. Obviously, it should be able to contact the surface of the seed dispensing tray 400 without the boss 401 without affecting the free rotation of the seed dispensing tray 400. When the boss 401 carrying seeds rotates to the air chamber baffle 601, the inner tube 402 is closed by the air chamber baffle 601, causing the boss 401 to lose its negative pressure adsorption force and throw off the seeds.

[0052] The negative pressure environment between the seed metering disc 400 and the rear baffle 600 can be generated by referring to the existing technology. In this invention, the air tube shaft 900 is a hollow shaft, and a through hole is provided in the part between the seed metering disc 400 and the rear baffle 600. When the air tube shaft 900 is connected to an external negative pressure source, a negative pressure environment can be generated between the seed metering disc 400 and the rear baffle 600.

[0053] In summary, the workflow of this invention is as follows:

[0054] The duckbill 701 portion of this invention is used for contact with the soil, and the air tube shaft 900 is connected to an external horizontally moving power source. The hollow portion of the air tube shaft 900 is connected to an external negative pressure source. During operation, the external power source drives the air tube shaft 900 to move the entire device horizontally. All rotatable components, such as the front fixed plate 300, seed plate 400, boss 401, seed plate limiting frame 500, rear baffle 600, duckbill ring frame 700, duckbill 701, and rear fixed plate 800, will rotate synchronously due to the reaction force from the ground. The space between the seed plate 400 and the rear baffle 600 is provided with negative pressure by the external negative pressure source to become a negative pressure environment.

[0055] See Figure 11 The front housing 200 is divided into four seed supply areas: seed filling area a, seed cleaning area b, seed carrying area c, and seed unloading area d. Seeds fed into the seed inlet 201 by the seed hopper 100 will first accumulate in seed filling area a. Since the front housing 200 is fixed, the seeds will not rotate with the whole device. However, the protrusions 401 on the seed tray 400 will continuously pass through the through holes 203 of the seed receiving plate and adsorb the seeds to their tips. With the rotation of the whole device, the seeds will be moved to seed cleaning area b. In seed cleaning area b, seeds not directly adsorbed by the protrusions 401 will be returned to seed filling area a by the seed screening block 207, while seeds directly adsorbed by the protrusions 401 will continue to enter seed carrying area c with the protrusions 401. In the seed-carrying zone c, the protrusion 401 works in conjunction with the directional airflow inside the device. The trapezoidal airflow of the protrusion 401 forms a stable air film support, counteracting the tangential component of centrifugal force. This allows the seeds to be stably adsorbed onto the surface of the suction holes under negative pressure, ensuring that they do not fall off during high-speed operation. Simultaneously, after passing through the seed brush 206 in the seed-carrying zone c, the seed surface is cleaned. Finally, after the protrusion 401 carries the seeds into the seed-unloading zone d, the negative pressure on the protrusion 401 is released by the air chamber baffle 601. The seeds fall along the seed outlet 208 into the external duckbill ring 700, further into the lower duckbill 701, and are discharged into the prepared soil holes. After unloading, the protrusion 401 will continue along a circular trajectory to re-enter the seed-filling zone a, thus starting the next sowing cycle.

[0056] Example:

[0057] To test the actual sowing effect of the device, a sowing experiment was conducted using the aforementioned sowing device. The experimental maize material was Zhengdan 958 maize seeds, with a thousand-seed weight of 347.3g, average three-axis dimensions (length × width × height) of 10.25mm × 8.72mm × 6.46mm, and a seed moisture content of 12%. This meets the typical characteristics of seeds that are prone to unstable adsorption in traditional air-suction seed metering devices. The experimental site was a 2-mu (approximately 0.33 hectares) experimental field in the dryland farming area of ​​Lintao, Dingxi, Gansu Province, with 1 mu (approximately 0.067 hectares) each for the raised platform group and the traditional group. The soil type was sandy loam with a soil moisture content ranging from 11% to 13%.

[0058] Meanwhile, the seed metering disc 400 in this invention was replaced with a conventional seed metering disc without protrusions, and a comparative sowing experiment was conducted with this invention to compare the sowing efficiency of the two. The results are shown in Table 1:

[0059] Table 1. Performance Comparison between the convex seed metering disc and the traditional seed metering disc.

[0060]

[0061] like Figure 9 As shown, when sowing irregular seeds, seed metering devices using traditional seed metering discs mainly employ two adsorption postures: one is adsorption where the flat surface of the seed is parallel to the surface of the suction hole, such as... Figure 9 As shown in Figure a, another type is adsorption perpendicular to the seed's flat surface and the surface of the pores, such as... Figure 9 As shown in b. From Figure 9 As shown in section a, the adsorbed seeds have a small contact area with the population and a large contact area with the windward side of the suction orifice. They experience less friction within the population, while the suction force of the orifice is strong, effectively counteracting the effects of gravity. Therefore, they are less likely to slip during the seed-carrying motion of the seed metering disc. Furthermore, due to… Figure 9 As shown in b, the adsorbed seeds have a large contact area with the population, but a small windward area with the suction holes. They are subject to greater friction within the population and less adsorption force from the suction holes, making them prone to slipping due to gravity during seed-carrying motion with the seed metering disc.

[0062] In addition, such as Figure 10 As shown, the inclined design of the boss 401 can change the airflow path around the suction hole, forming a directional converging airflow field in the seed filling area a. The airflow is accelerated by contraction along the inclined surface of the boss 401 and then acts perpendicularly on the flat side of the seed. Compared with the disordered turbulence of the traditional flat plate, the boss 401 guides the airflow to form a perpendicular to the flat surface of the seed, which is more conducive to generating adsorption force and tangential support force for the seed. This makes the direction of the resultant aerodynamic force on the seed approach the center of the suction hole, thereby providing stable support for the seed.

[0063] Based on this, as can be seen from Table 1 above, compared with the disordered turbulence of the traditional flat disk, the protrusion 401 guides the airflow to form an adsorption force and tangential support force perpendicular to the flat surface of the seed, so that the direction of the resultant aerodynamic force on the seed is closer to the center of the suction hole, thereby increasing the parallel adsorption rate from 65.4% to 92.3%.

[0064] In seed-carrying zone c, the inclined surface contraction of protrusion 401 can guide the airflow to form an adhesion effect, generating an airflow support force opposite to the centrifugal force, which increases the critical separation speed from 45 r / min to 68 r / min, ensuring stable seed adsorption during high-speed operation. At the same time, based on the higher speed, the adhering seeds can be separated more fully in seed-cleaning zone b, further increasing the single-seed rate from 82.1% to 95.2%, ensuring the quality of sowing.

[0065] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this invention.

[0066] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A seed metering device with a raised parallel suction hole, characterized in that, It includes a front shell (200), a front fixing plate (300), a seed metering plate (400), a rear baffle (600), a duckbill ring frame (700), a rear fixing plate (800), and a tracheal shaft (900). The front shell (200) is a disc with a seed inlet (201) on its surface, which is fixedly sleeved on the tracheal shaft (900) which is in the shape of a cylindrical tube. A rotatable disc-shaped rear baffle (600) is sleeved on the side of the tracheal shaft (900) away from the front shell (200). Both the front fixed plate (300) and the rear fixed plate (800) are annular plate structures. The front fixed plate (300) is rotatably and coaxially sleeved on the front housing (200), and the rear fixed plate (800) is coaxially sleeved on the rear baffle (600). A duckbill ring frame (700) is detachably and coaxially clamped between the front fixed plate (300) and the rear fixed plate (800), so that the front housing (200), the front fixed plate (300), the rear baffle (600), the duckbill ring frame (700), and the rear fixed plate (800) can form a circular sealed container with the tracheal shaft (900) extending into it as the central axis. Inside the sealed container, a seed metering disc (400) is fitted onto the air tube shaft (900). The seed metering disc (400) is detachably fixed to the rear baffle (600). On the side of the seed metering disc (400) near the front shell (200), multiple sets of frustum-shaped protrusions (401) capable of air-sifting and screening seeds are provided. The protrusions (401) are spaced apart in a ring shape, and the tip of each protrusion (401) is aligned with the linear velocity direction of the ring it belongs to during rotation. The platform (401) is provided with an inner tube (402) that connects the tip of the boss (401) and the seed metering disc (400) on the side away from the front shell (200); when the side of the seed metering disc (400) without the boss (401) is kept under negative pressure and the seed metering disc (400) is rotated, the seed metering disc (400) can deliver the seeds that have been put into the sealed container through the front shell (200) to the duckbill (701) of the duckbill ring frame (700) through the boss (401); The front housing (200) has a seed receiving plate (202) and a seed receiving wall (205) adjacent to the seed receiving plate (400) on the side close to the seed receiving plate (400). The seed receiving plate (202) and the seed receiving wall (205) form a "V" shape structure. The low point of the "V" shape structure is located below the seed inlet (201). The seed receiving plate (202) is provided with a seed receiving plate through hole (203) that allows the boss (401) to pass through. A through hole brush (204) is provided in the seed receiving plate through hole (203). The front housing (200) is also provided with a seed brush (206) and a seed screening block (207) on the side near the seed metering tray (400). The ring where the boss (401) is located can pass through the seed plate through hole (203) and the seed brush (206); the seed screening block (207) is adjacent to the ring where the boss (401) is located, and can screen out the excess seeds adsorbed on the boss (401); The front housing (200) is provided with a seed outlet (208), which is located below the seed receiving plate (202).

2. The boss-type parallel suction hole seed metering device according to claim 1, characterized in that: The distance between the seed-bearing plate (202) and the seed-bearing wall (205) and the seed-dispensing tray (400) is no more than 0.5 mm.

3. The boss-type parallel suction hole seed metering device according to claim 1, characterized in that: The seed inlet (201) is provided with a seed hopper (100) facing outwards from the seed metering device.

4. A boss-type parallel suction hole seed metering device according to claim 1, characterized in that: The rear baffle (600) is detachably fixed with a seed metering tray limiter (500) on the side near the seed metering tray (400). The seed metering tray limiter (500) is a circular ring with multiple sets of spaced inward protrusions pointing to the center. The seed metering tray (400) is coaxially clamped between the seed metering tray limiter (500) and the rear baffle (600).

5. A boss-type parallel suction hole seed metering device according to claim 1, characterized in that: An air chamber baffle (601) is fixedly installed on the air pipe shaft (900) between the rear baffle (600) and the seed metering tray (400). The air chamber baffle (601) is located between the seed receiving plate (202) and the seed brush (206). It can contact the surface of the seed metering tray (400) on the side without the boss (401), and the ring where the boss (401) is located can pass through the air chamber baffle (601).

6. A boss-type parallel suction hole seed metering device according to claim 1, characterized in that: The duckbill ring frame (700) is a ring with multiple sets of duckbill (701) spaced apart on its side surface, and the inlet of the duckbill (701) can be connected to the seed outlet (208).

7. A boss-type parallel suction hole seed metering device according to claim 1, characterized in that: The air tube shaft (900) is a hollow shaft, and a through hole is provided in the part between the seed metering disc (400) and the rear baffle (600).

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