Sunflower seed directional drop seed meter

Abstract

This application relates to a sunflower seed directional seed metering device, belonging to the technical field of seed metering devices. It includes a seed chamber shell, a seed stirring component, a seed cleaning component, a drive shaft assembly, a seed dispensing component, a contour seed metering disc, a metal wear-resistant disc, and a negative pressure shell, used for batch carrying of sunflower seeds. The seed stirring component is disposed inside the seed chamber shell, the seed cleaning component is fixedly disposed on the seed chamber shell and located outside the seed stirring component, the drive shaft assembly is rotatably connected to the inside of the seed chamber shell, the seed dispensing component is disposed on the opposite side of the seed stirring component's central axis from the seed cleaning component, the contour seed metering disc is connected to the drive shaft assembly, the metal wear-resistant disc is connected to the drive shaft assembly, and the negative pressure shell is connected to the seed chamber shell. This application achieves directional seed dispensing of sunflower seeds by utilizing the combined action of the seed cleaning and contour grooves, allowing the seeds to move to the dispensing position with their tips facing forward or backward. The seed dispensing device then achieves directional seed dispensing, thereby improving the germination rate of sunflower seeds.

Description

Technical Field

[0001] This application relates to the technical field of seed metering devices, and in particular to a sunflower seed directional seed metering device. Background Technology

[0002] Sunflowers are ornamental and easy to grow. However, in traditional sowing methods, the soil texture, moisture, fertility and other conditions vary greatly from plot to plot, making it difficult for ordinary sowing equipment to adapt. This can result in seeds of different states after sowing, and the soil may not be able to provide enough nutrients to the seeds, leading to a lower seed survival rate.

[0003] Through field research, the inventors discovered that traditional seed metering devices and manual sowing resulted in seeds exhibiting various postures in the soil, which could be broadly categorized into three postures: pointed upwards, pointed downwards, and lying flat. Statistical analysis revealed that the distribution of these three postures varied across different plots. Further manual sowing experiments, involving directional planting of sunflowers in different postures, showed that when seeds were lying flat and facing the same direction, the germination rate and yield were significantly higher than when pointed downwards, pointed upwards, or lying flat randomly.

[0004] Therefore, there is an urgent need for a sunflower seed directing and metering device to improve the germination rate by adjusting the sowing posture of sunflower seeds. Utility Model Content

[0005] The purpose of this application is to provide a sunflower seed directional seed metering device, which uses the combined action of seed-supporting and seed-cleaning contour grooves to move sunflower seeds to the seeding position with their pointed ends facing forward or backward, and then uses the seeding device to achieve directional seeding of sunflower seeds, thereby improving the germination rate of sunflower seeds.

[0006] The sunflower seed directing and metering device provided in this application adopts the following technical solution:

[0007] A sunflower seed directing and metering device includes:

[0008] Seed chamber shell, used to hold sunflower seeds in bulk;

[0009] The seed stirring component is located inside the seed chamber shell and is used to stir the seeds within the seed chamber shell.

[0010] The seed-raising and guiding component is fixedly installed on the seed chamber shell and located outside the seed-stirring component, and is used to guide the seeds to the target position;

[0011] The drive shaft assembly is rotatably mounted inside the seed chamber housing and is used to drive the seed stirring assembly to rotate;

[0012] The seed delivery component is located on the opposite side of the seed stirring component and the seed cleaning component, and is used to deliver seeds to the outside of the seed chamber shell;

[0013] The seed metering disc is connected to the drive shaft assembly and has a ring of contoured grooves distributed on the same circumference. The contoured grooves serve as the target positions for the seed cleaning and supporting components to guide the seeds.

[0014] A metal wear-resistant disc, connected to the drive shaft assembly, is provided with a ring of air suction holes distributed on the same circumference and positioned opposite the contoured groove; and

[0015] The negative pressure shell is connected to the seed chamber shell and forms a closed seed feeding cavity with the seed chamber shell. It includes a negative pressure area for adsorbing seeds and a non-negative pressure area for feeding seeds. The non-negative pressure area corresponds to the position of the seed feeding component.

[0016] As a preferred technical solution of this application, the seed chamber shell includes a back plate and an annular plate. The annular plate is connected to the negative pressure shell. A portion of the annular plate is configured to widen the inner wall of the seed chamber. The back plate is provided with a transparent observation window corresponding to the position of the seed cleaning component.

[0017] As a preferred technical solution of this application, the seed stirring component includes:

[0018] The baffle is connected to the drive shaft assembly and rotates with the drive shaft assembly;

[0019] Several agitating blocks are set on one edge of the baffle plate facing the back plate of the seed chamber shell, and the agitating blocks can extend into the internal space of the seed chamber shell.

[0020] As a preferred technical solution of this application, the seed-clearing component includes:

[0021] The seed cleaning brush is connected to the inside of the back plate of the seed chamber shell and is located inside the contoured groove on the contoured seed tray. It is used to guide the seeds into the contoured groove.

[0022] The seed cleaning rubber plate is connected to the ring plate of the seed chamber shell and is located behind the seed cleaning brush after the contour groove. It is used to scrape excess seeds away from the contour groove and drop them into the seed chamber.

[0023] The lower seed scraper is connected to the upper inner side of the back plate of the seed chamber shell and is located inside the contoured groove on the contoured seed metering tray.

[0024] The upper seed-supporting scraper is connected to the upper part of the ring plate of the seed chamber shell and is opposite to the lower seed-supporting scraper. A channel is set between the upper and lower seed-supporting scrapers to be opposite to the contoured groove. The upper and lower seed-supporting scrapers work together to adjust the seeds into the contoured groove.

[0025] As a preferred technical solution of this application, the bottom of the contoured groove is provided with a suction hole, and a retaining edge is provided on the side of the contoured groove away from the axis of the contoured seed metering disc. The long axis of the contoured groove is parallel to the tangent direction of the rotation of the contoured seed metering disc.

[0026] As a preferred technical solution of this application, the negative pressure housing includes a negative pressure chamber and a sealing wear-resistant gasket connecting the negative pressure chamber and the metal wear-resistant disc, with a negative pressure-free area disposed on the lower side of the sealing wear-resistant gasket.

[0027] As a preferred technical solution of this application, the seeding component includes a seeding chamber disposed below the negative pressure zone, an air amplifier connected to the lower part of the seeding chamber, and a seeding tube connected to the lower part of the air amplifier, wherein the air amplifier is connected to a negative pressure airflow.

[0028] As a preferred technical solution of this application, the transmission shaft assembly includes a shaft body and fasteners mounted on the shaft body. One end of the shaft body extends out from the negative pressure housing and is connected to a power source. The fasteners are used to fasten the seed mixing assembly, the conformal seed metering disc, and the metal wear-resistant disc.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The device of this application uses a contoured groove for seed selection during the seed picking stage, which realizes the adsorption and posture adjustment of sunflower seeds, thereby achieving semi-directional adsorption of sunflower seeds, that is, achieving the parallel tangential direction of the seed's long axis to the contoured seed metering disc.

[0031] 2. In the seeding stage, the traditional seeding method has been changed. Instead, airflow adsorption is used on the seeding tube to achieve directional seeding of sunflower seeds. Attached Figure Description

[0032] Figure 1 This is an exploded view of the overall structure of the seed metering device according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of the seed chamber shell in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the negative pressure shell structure in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the installation structure of the seed cleaning and planting component in the embodiments of this application;

[0036] Figure 5 This is a schematic diagram of the seeding component in an embodiment of this application;

[0037] In the diagram, 1. Seed chamber shell; 1-1. Widened inner wall of the seed chamber; 1-2. Transparent observation window; 2. Seed stirring assembly; 2-1. Baffle plate; 2-2. Stirring block; 3. Seed cleaning assembly; 3-1. Seed cleaning brush; 3-2. Seed cleaning rubber plate; 3-3. Lower seed scraper; 3-4. Upper seed scraper; 4. Drive shaft assembly; 5. Seed feeding assembly; 5-1. Seed feeding chamber; 5-2. Air amplifier; 5-3. Seed feeding tube; 6. Contour seed metering tray; 6-1. Contour groove; 7. Metal wear-resistant disc; 7-1. Air suction hole; 8. Sealing wear-resistant gasket; 9. Negative pressure air chamber. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0039] Example: This application proposes a sunflower seed directional seed metering device, referring to... Figure 1-5 The device includes a seed chamber shell 1, a seed stirring component 2, a seed cleaning component 3, a drive shaft assembly 4, a seed feeding component 5, a contour seed metering disc 6, a metal wear-resistant disc 7, and a negative pressure shell. The seed chamber shell 1 and the negative pressure shell are connected to each other to form a complete seed metering device shell, and a seed feeding cavity is formed inside. The seed stirring component 2, the seed cleaning component 3, the drive shaft assembly 4, the contour seed metering disc 6, and the metal wear-resistant disc 7 are all installed in the seed feeding cavity. The seed feeding component 5 is installed in the lower part of the seed metering device shell and communicates with the internal seed feeding cavity.

[0040] The seed chamber shell 1 is equipped with a seed inlet for convenient feeding of sunflower seeds into it. The seed chamber shell 1 is used to hold sunflower seeds in batches to ensure a sufficient seed supply during the operation of the seed metering device. The bottom part of the seed chamber shell 1 is designated as the seed feeding area, and the remaining space is designated as the seed suction area. The seed chamber shell 1 includes a back plate and a ring plate located on one side of the back plate. The seed chamber shell 1 is connected to the negative pressure shell through the ring plate.

[0041] The drive shaft assembly 4 is installed inside the seed metering device housing. The seed stirring assembly 2, the conformal seed metering disc 6, and the metal wear-resistant disc 7 are all mounted on the drive shaft assembly 4 and rotate together with it. One end of the drive shaft assembly 4 extends out from the negative pressure housing. The conformal seed metering disc 6 is coaxially arranged on the outer ring of the seed stirring assembly 2, and an annular space is provided between it and the seed stirring assembly 2. The conformal seed metering disc 6 is closely attached to and connected to the metal wear-resistant disc 7.

[0042] The seed stirring component 2 extends into the seed chamber shell 1 to stir the sunflower seeds inside the seed chamber shell 1, preventing the seeds from getting stuck inside the seed chamber shell 1 and facilitating seed discharge.

[0043] The seed cleaning and supporting component 3 is fixedly installed on the upper part of the seed chamber shell 1 and located inside the seed chamber shell 1 and outside the seed stirring component 2. The seed cleaning and supporting component 3 is used to guide the flowing seeds to the target position, thereby facilitating accurate seed placement.

[0044] The seed-feeding component 5 is located on the lower side of the central axis of the drive shaft assembly 4 and is vertically opposite to the seed-cleaning component 3. The seed-feeding component 5 is installed on the seed chamber shell 1, which is used to receive the arranged seeds and regularly place the seeds from the seed chamber shell 1 to the outside.

[0045] The conformal seed metering disc 6 is annular and connected to the drive shaft assembly 4. A ring of conformal grooves 6-1 are arranged on the conformal seed metering disc 6, distributed on the same circumference. The conformal grooves 6-1 are concave on the conformal seed metering disc 6 and are shaped like a sunflower seed with one pointed end. The long axis of the conformal grooves 6-1 is parallel to the tangent of the conformal seed metering disc 6. A retaining edge is provided on the side of the conformal grooves 6-1 away from the conformal seed metering disc 6 to prevent sunflower seeds from entering. The conformal grooves 6-1 serve as the target position for the seed-guiding component 3 to guide the seeds, which are then guided into the conformal grooves 6-1 by the seed-guiding component 3.

[0046] The metal wear-resistant disc 7 is a disc and is fitted onto the transmission shaft assembly 4. The metal wear-resistant disc 7 is provided with a ring of air suction holes 7-1 distributed on the same circumference. The air suction holes 7-1 are opposite to the contoured grooves 6-1, and the air suction holes 7-1 are connected to the suction holes at the bottom of the contoured grooves 6-1.

[0047] The negative pressure shell is connected to the seed chamber shell 1, forming a closed seed-feeding cavity. The negative pressure shell includes a negative pressure zone for seed adsorption and a non-negative pressure zone for seed dispensing. The negative pressure zone corresponds to the seed adsorption zone within the seed chamber shell 1, and the non-negative pressure zone corresponds to the seed dispensing zone within the seed chamber shell 1. The seed dispensing component 5 is installed at the corresponding position below the non-negative pressure zone. A negative pressure pipe is connected to the negative pressure shell to provide negative pressure within the shell, thereby adsorbing the seeds into the negative pressure zone.

[0048] To address the issue of inconsistent seed placement postures in existing sunflower seed metering devices, which affects germination rates, this embodiment utilizes a seed stirring component 2 to agitate the flow of sunflower seeds within the seed chamber housing 1. During this flow, due to the obstruction and guidance of the upper ring plate on the seed chamber housing 1, the seeds will be positioned with their long axis parallel to the tangential direction of rotation of the contour seed metering disc 6. Under the combined action of the contour groove 6-1 and negative pressure, the seeds are adsorbed and detached from the seed population. Guided by the seed cleaning component 3, the adsorbed seeds will enter the contour groove 6-1, where excess seeds are removed. With further assistance from the seed cleaning component 3, the seeds rotate together with the contour groove 6-1 with their long axis parallel to the tangential direction of rotation until the contour groove 6-1 rotates to the area without negative pressure (the seed placement area). Then, the sunflower seeds enter the seed placement component 5 in the same arrangement direction for seed placement.

[0049] Furthermore, a portion of the ring plate of the seed chamber shell 1 is configured to widen the inner wall of the seed chamber 1-1, and a transparent observation window 1-2 is provided on the back plate of the seed chamber shell 1 corresponding to the position of the seed cleaning component 3.

[0050] Through the above technical solution, the seed population flow characteristics of sunflower seeds in the seed chamber shell 1 are affected. When the distance between the inner wall of the ring plate of the seed chamber shell 1 and the contoured groove 6-1 reaches a certain position, the seed tray suction performance can be effectively improved. Therefore, in the seed filling and suction area, the inner wall of the seed chamber 1-1 is widened. In order to facilitate the adjustment of the position of the seed cleaning and supporting component 3, a transparent observation window 1-2 is opened on the back plate of the seed chamber shell 1.

[0051] Furthermore, the drive shaft assembly 4 includes a shaft and fasteners mounted on the shaft. One end of the shaft extends from the negative pressure housing and is connected to a power source, which drives the rotation of the shaft. The fasteners are used to secure the seed mixing assembly 2, the conformal seed metering disc 6, and the metal wear-resistant disc 7. The seed mixing assembly 2 is mounted on the end of the shaft that extends into the seed chamber housing 1. The metal wear-resistant disc 7 is fixed by the fasteners, leaving a gap between the metal wear-resistant disc 7 and the seed mixing assembly 2. The conformal seed metering disc 6 is coaxially fixed to the side of the metal wear-resistant disc 7 facing the seed mixing assembly 2.

[0052] The drive shaft assembly 4 drives the seed stirring assembly 2 to rotate, causing the seed stirring assembly 2 to stir the sunflower population to flow in the seed suction area, so that the sunflower seeds can enter the contour groove 6-1. The drive shaft assembly 4 drives the contour seed metering disc 6 and the metal wear-resistant disc 7, so that the contour seed metering disc 6 and the metal wear-resistant disc 7 can carry the seeds from the seed suction area to the seed delivery area.

[0053] Furthermore, the seed stirring assembly 2 includes a baffle plate 2-1 and stirring blocks 2-2. The baffle plate 2-1 is a disc with a diameter smaller than the inner diameter of the conformal seed metering disc 6. The baffle plate 2-1 can be attached to the metal wear-resistant disc 7 or have a certain gap with it, the gap width being sufficient to prevent seeds from entering. The baffle plate 2-1 is connected to the shaft of the drive shaft assembly 4 and rotates with the shaft. Several stirring blocks 2-2 are provided, and all stirring blocks 2-2 are distributed on the outermost ring of the side of the baffle plate 2-1 facing away from the metal wear-resistant disc 7. The stirring blocks 2-2 can extend into the internal space of the seed chamber shell 1 to stir the seed flow.

[0054] Furthermore, the seed cleaning component 3 includes a seed cleaning brush 3-1, a seed cleaning rubber plate 3-2, a lower seed cleaning scraper 3-3, and an upper seed cleaning scraper 3-4.

[0055] The seed cleaning brush 3-1 is connected to the inner side of the back plate of the seed chamber shell 1 and is located inside the contoured groove 6-1 on the contoured seed metering tray 6. It is used to guide the seeds into the contoured groove 6-1. The seed cleaning brush 3-1 includes a connecting ear plate connected to the seed chamber shell 1 and an arc-shaped block. The distance between the arc-shaped block and the contoured groove 6-1 gradually decreases along the rotation direction of the contoured seed metering tray 6, which can better guide the seeds into the contoured groove 6-1.

[0056] The seed cleaning rubber plate 3-2 is connected to the end face where the annular plate of the seed chamber shell 1 connects to the negative pressure shell. The seed cleaning rubber plate 3-2 is located behind the seed cleaning brush 3-1 in the contoured groove 6-1. It is used to scrape excess seeds away from the contoured groove 6-1 and allow excess seeds to fall back into the seed chamber. The seed cleaning rubber plate 3-2 includes a connecting ear plate connected to the seed chamber shell 1 and an arc-shaped plate. The arc-shaped plate is set close to the contoured groove 6-1 and avoids the contoured groove 6-1, so that the seeds can fall completely into the contoured groove 6-1.

[0057] The lower seed-supporting scraper 3-3 is connected to the upper inner side of the back plate of the seed chamber shell 1, and is located inside the contoured groove 6-1 on the contoured seed metering tray 6. In this embodiment, the structure of the lower seed-supporting scraper 3-3 is the same as that of the seed-cleaning brush 3-1, but its installation position is relatively further back than that of the seed-cleaning brush 3-1.

[0058] The upper seed-supporting scraper 3-4 is connected to the end face of the ring plate of the seed chamber shell 1 that connects to the negative pressure shell. The upper seed-supporting scraper 3-4 and the lower seed-supporting scraper 3-3 are vertically opposite each other, and a channel is set between the upper seed-supporting scraper 3-4 and the lower seed-supporting scraper 3-3, which is opposite to the contoured groove 6-1. The structure of the upper seed-supporting scraper 3-4 is the same as that of the lower seed-supporting scraper 3-3. The upper seed-supporting scraper 3-4 and the lower seed-supporting scraper 3-3 work together to adjust the seeds into the contoured groove 6-1, and ensure that the long axis of the seeds is parallel to the tangential direction of the rotation direction of the contoured seed metering disc 6.

[0059] Furthermore, the seed feeding assembly 5 includes a seed feeding chamber 5-1, an air amplifier 5-2, and a seed feeding tube 5-3. The seed feeding chamber 5-1 is configured as a shell that runs vertically through the shell, and is connected to the lower part of the ring plate end face of the seed chamber shell 1 at the position corresponding to the negative pressure zone via a connecting ear plate. The lower ring plate of the seed chamber shell 1 is provided with a feeding channel corresponding to the seed feeding chamber 5-1. The air amplifier 5-2 is connected to the lower part of the seed feeding chamber 5-1. The inner diameter of the air amplifier 5-2 is larger than that of the seed feeding chamber 5-1, so that the sunflower seeds can be deflected within the air amplifier 5-2. A negative pressure airflow pipe is connected to the side wall of the air amplifier 5-2, and the seed feeding tube 5-3 is connected to the bottom of the air amplifier 5-2.

[0060] The air amplifier 5-2 is connected to a negative pressure airflow, which creates a negative pressure zone in the seeding chamber 5-1. The seeds are deflected under the action of the negative pressure airflow and enter the seeding tube 5-3 with their large end facing down and maintain their position as they fall. The directional zero-speed seeding of sunflower seeds is achieved based on the seeding curve at the bottom of the seeding tube 5-3.

[0061] Furthermore, the negative pressure housing includes a sealing wear-resistant gasket 8 and a negative pressure air chamber 9. The sealing wear-resistant gasket 8 is connected between the negative pressure air chamber 9 and the metal wear-resistant disc 7. The sealing wear-resistant gasket 8 seals the position where the edge of the negative pressure area of ​​the negative pressure air chamber 9 contacts the metal wear-resistant disc 7, while maintaining the communication between the negative pressure air chamber 9 and the air suction hole 7-1. A negative pressure airflow pipe is also connected to the negative pressure air chamber 9.

[0062] The seed tray shell is formed by the sealing wear-resistant gasket 8 and the negative pressure air chamber 9. The negative pressure zone provides negative pressure for seed suction. In the non-negative pressure zone, the seeds are not adsorbed by the conformal seed tray 6. At the same time, the seeds are subjected to the negative pressure airflow of the air amplifier 5-2, causing the seeds to rotate and enter the seed feeding tube 5-3.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sunflower seed directional seed metering device, characterized in that, include: Seed chamber shell (1), used to carry sunflower seeds in batches; The seed stirring component (2) is installed inside the seed chamber shell (1) and is used to stir the seeds to move inside the seed chamber shell (1); The seed cleaning and support component (3) is fixedly installed on the seed chamber shell (1) and located outside the seed stirring component (2) to guide the seeds to the target position; The drive shaft assembly (4) is rotatably disposed inside the seed chamber housing (1) and is used to drive the seed stirring assembly (2) to rotate; The seed delivery component (5) is located on the opposite side of the central axis of the seed stirring component (2) and the seed cleaning component (3), and is used to deliver seeds to the outside of the seed chamber shell (1); The seed-feeding tray (6) is connected to the drive shaft assembly (4) and is provided with a ring of seed-feeding grooves (6-1) distributed on the same circumference. The seed-feeding grooves (6-1) serve as the target position for the seed-feeding assembly (3) to feed the seeds. A metal wear-resistant disc (7) is connected to the drive shaft assembly (4) and is provided with a ring of air suction holes (7-1) distributed on the same circumference and opposite to the contoured groove (6-1); as well as The negative pressure shell is connected to the seed chamber shell (1) and forms a closed seed feeding cavity with the seed chamber shell (1), including a negative pressure area for adsorbing seeds and a non-negative pressure area for feeding seeds, with the non-negative pressure area corresponding to the position of the seed feeding component (5).

2. The sunflower seed directional seed metering device according to claim 1, characterized in that, The seed chamber shell (1) includes a back plate and an annular plate. The annular plate is connected to the negative pressure shell. A part of the annular plate is configured to widen the inner wall of the seed chamber (1-1). The back plate is provided with a transparent observation window (1-2) at the position corresponding to the seed cleaning component (3).

3. The sunflower seed directional seed metering device according to claim 1, characterized in that, The seed stirring component (2) includes: The baffle (2-1) is connected to the drive shaft assembly (4) and rotates with the drive shaft assembly (4); Several stirring blocks (2-2) are set on one side edge of the baffle plate (2-1) facing the back plate of the seed chamber shell (1), and the stirring blocks (2-2) can extend into the internal space of the seed chamber shell (1).

4. A sunflower seed directional seed metering device according to claim 2, characterized in that, The purifying seed component (3) includes: The seed cleaning brush (3-1) is connected to the inner side of the back plate of the seed chamber shell (1) and is located on the inner side of a ring of contoured grooves (6-1) on the contoured seed tray (6), and is used to guide the seeds into the contoured grooves (6-1). The seed cleaning rubber plate (3-2) is connected to the ring plate of the seed chamber shell (1) and is located behind the seed cleaning brush (3-1) after the contour groove (6-1). It is used to scrape excess seeds away from the contour groove (6-1) and drop them into the seed chamber. The lower supporting scraper (3-3) is connected to the upper inner side of the back plate of the seed chamber shell (1) and is located inside the contoured groove (6-1) on the contoured seed tray (6). The upper seed-supporting scraper (3-4) is connected to the upper part of the ring plate of the seed chamber shell (1) and is vertically opposite to the lower seed-supporting scraper (3-3). The upper seed-supporting scraper (3-4) and the lower seed-supporting scraper (3-3) are configured with a channel opposite to the contour groove (6-1). The upper seed-supporting scraper (3-4) and the lower seed-supporting scraper (3-3) work together to adjust the seeds into the contour groove (6-1).

5. A sunflower seed directional seed metering device according to claim 4, characterized in that, The bottom of the contoured groove (6-1) is provided with a suction hole, and a retaining edge is provided on the side of the contoured groove (6-1) away from the axis of the contoured seed metering disc (6). The long axis of the contoured groove (6-1) is parallel to the tangent direction of the rotation of the contoured seed metering disc (6).

6. A sunflower seed directional seed metering device according to claim 1, characterized in that, The negative pressure housing includes a negative pressure chamber (9) and a sealing wear-resistant gasket (8) connecting the negative pressure chamber (9) and the metal wear-resistant disc (7). The negative pressure-free area is located on the lower side of the sealing wear-resistant gasket (8).

7. A sunflower seed directional seed metering device according to claim 6, characterized in that, The seeding assembly (5) includes a seeding chamber (5-1) located below the negative pressure zone, an air amplifier (5-2) connected to the lower part of the seeding chamber (5-1), and a seeding tube (5-3) connected to the lower part of the air amplifier (5-2). The air amplifier (5-2) is connected to a negative pressure airflow.

8. A sunflower seed directional seed metering device according to any one of claims 1-7, characterized in that, The drive shaft assembly (4) includes a shaft and fasteners mounted on the shaft. One end of the shaft extends out from the negative pressure housing and is connected to a power source. The fasteners are used to fasten the seed mixing assembly (2), the conformal seed metering disc (6), and the metal wear-resistant disc (7).

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