Positive pressure type high-speed precision seed-metering device and seeding machine with positive pressure type high-speed precision seed-metering device

Abstract

The utility model relates to a positive-pressure type high-speed precision seed-metering device and a seeding machine with the positive-pressure type high-speed precision seed-metering device. The seed-metering device comprises a main body with a cavity inside, a circular seed disc is arranged inside the main body and divides the inside of the main body into a seed-metering cavity and a positive pressure cavity, the main body is provided with a power device which is connected with the center of the seed disc and drives the seed disc to rotate, the edge of the seed disc is provided with a plurality of holes along the circumferential direction, and the main body is provided with an exhaust port communicated with the positive pressure cavity; a seed inlet and an air inlet which are respectively communicated with the seed-metering cavity are formed in the upper part of the main body, a seed-metering opening is formed in the lower part of the seed-metering cavity, a seed feeding pipe communicated with the seed-metering opening is arranged in the seed-metering cavity, the upper end of the seed feeding pipe is close to the hole, and a plugging structure is arranged at the position, corresponding to the seed feeding pipe, in the positive pressure cavity. The device has the advantages that dust can be prevented from entering the seed-metering device by pressing the seeds through positive pressure, the performance and reliability of the seed-metering device are improved, and the falling time deviation of adjacent seeds can be shortened by conveying the seeds through positive pressure airflow.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery and equipment, and in particular to a positive pressure high-speed precision seed metering device and a seeder having the same. Background Technology

[0002] In recent years, with rising labor costs and the rapid maturation of tractor navigation technology, agricultural machinery operation efficiency has been gradually improving, and seeders are rapidly developing towards higher speeds and greater precision. In developed countries in Europe and America, seeder operating speeds have generally exceeded 15 km / h, and high-speed seeders are gradually becoming popular models. However, the operating speed of domestically produced seeders is generally below 12 km / h, and imported high-speed seeders have had a significant impact on the domestic seeder market. The seed metering device is the core working component of the seeder, and its performance directly affects the overall operating speed of the machine.

[0003] Currently, most existing seed metering devices use a pneumatic suction type. Their working principle is as follows: seeds are adsorbed onto the surface of the seed metering disc under negative pressure and rotate with the disc to the seeding area. In the seeding area, the seeds lose their adsorption and sequentially detach from the disc, entering the seed guide tube. Under gravity, they slide down the tube wall and into the seed bed. Overall, this method has the following disadvantages:

[0004] ① Poor plant spacing consistency: When the seeder is running at high speed, the vibration of the whole machine is aggravated, and the seeds cannot slide down the wall of the seed guide tube. They may even bounce off the tube wall, causing collisions between seeds or between seeds and the tube wall, which seriously disrupts the seed arrangement order and reduces the consistency of plant spacing. Therefore, the existing technology is not suitable for high-speed sowing operations. When the sowing speed is increased to a certain extent, the consistency of plant spacing cannot be guaranteed.

[0005] ② After the air supply to the seed tray of the air suction seed metering device is cut off, the seeds rely on gravity and inertia to detach from the seed tray, resulting in a delay in the time it takes for the seeds to detach from the seed tray, which reduces the uniformity of sowing.

[0006] ③ The working environment of the air suction seed metering device is full of dust. Dust is drawn into the cavity of the air suction seed metering device along with the air and accumulates, affecting the performance and reliability of the seed metering device.

[0007] Therefore, it is necessary to develop a positive pressure high-speed precision seed metering device to overcome the above-mentioned technical problems. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a positive pressure high-speed precision seed metering device and a seeder with the same, which effectively overcomes the defects of the prior art.

[0009] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0010] A positive pressure high-speed precision seed metering device includes a main body with an internal cavity. A circular seed disc is rotatably disposed inside the main body, dividing the internal cavity into a seed metering chamber and a positive pressure chamber. The main body is equipped with a power device connected to the center of the seed disc and driving its rotation. The seed disc has multiple axially penetrating holes near its edge along its circumference. The main body has an exhaust port communicating with the positive pressure chamber. The upper part of the main body has a seed inlet and an air inlet communicating with the seed metering chamber. The lower part of the seed metering chamber has a seed metering port penetrating the main body. A seed upper tube is vertically disposed inside the seed metering chamber, communicating with the seed metering port. The upper end of the seed upper tube is close to the holes in the seed disc. The bottom of the seed metering chamber has an openable seed discharge port. A sealing structure is disposed in the positive pressure chamber corresponding to the position of the seed upper tube. The sealing structure is used to seal or open each of the aforementioned holes passing through it.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, the main body includes a main shell and a front cover. One end of the main shell is open. The front cover is detachably sealed at the open end of the main shell. The front cover is provided with the exhaust port. The upper part of the main shell is provided with the seed inlet and the air inlet. The lower part of the main shell is provided with the seed unloading port and the seed discharge port. The main shell is equipped with the power device.

[0013] Furthermore, one end of the main housing is provided as a first annular end face, and one end of the front cover is provided as a second annular end face. An outer sealing ring is sandwiched between the first and second end faces, and an inner sealing ring is embedded in the front cover to seal against the end face of the seed disc.

[0014] Furthermore, a seed cleaner is installed in the seed discharge chamber via a connecting frame, which is close to the shaped hole of the seed tray.

[0015] Furthermore, the lower part of the main housing is provided with a gate-shaped enclosure. The enclosure is close to the seed tray and forms a seed dispensing area between the enclosure and the lower part of the seed tray and the seed dispensing cavity. A material passage is formed on the side of the enclosure away from the seed tray. A valve plate for adjusting the opening of the material passage is provided on the side of the enclosure away from the seed tray. The main housing is provided with a drive member that is connected to the valve plate and drives the valve plate to move to adjust the opening of the material passage.

[0016] Furthermore, the aforementioned seed outlet is connected to a downward-extending seed delivery tube.

[0017] Furthermore, the positive pressure chamber is equipped with a cleaning mechanism for cleaning up broken seeds or debris in the aforementioned orifice.

[0018] Furthermore, the aforementioned hole-cleaning mechanism includes a hole-cleaning wheel, which is mounted on the first bracket via a first bracket rotatably connected thereto. The outer edge of the hole-cleaning wheel is provided with a plurality of hole-cleaning teeth spaced apart along its circumference. Any one of the hole-cleaning teeth is embedded in one of the aforementioned shaped holes and rotates along with the aforementioned seed disc when it rotates, so that the plurality of hole-cleaning teeth are rolled into the shaped holes that the current position passes through.

[0019] Furthermore, the aforementioned sealing structure includes a pressure roller, which is mounted on the main body via a second bracket rotatably assembled therewith. The pressure roller contacts the seed disc and is used to seal each of the aforementioned shaped holes passing through it. The cleaning teeth are located above or below the cleaning roller on the same side.

[0020] The beneficial effects of this invention are: by pressing the seeds with positive pressure, dust can be prevented from entering the seed metering device, thus improving the performance and reliability of the seed metering device. In addition, by using positive pressure airflow to transport the seeds, the falling time deviation between adjacent seeds can be shortened, thus improving the consistency of the sowing spacing.

[0021] A seeder is also provided, including a positive pressure high-speed precision seed metering device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the positive pressure high-speed precision seed metering device of this utility model;

[0023] Figure 2 This is an exploded view of the structure of the positive pressure high-speed precision seed metering device of this utility model;

[0024] Figure 3 This is a schematic diagram of the positive pressure high-speed precision seed metering device of this utility model after removing the front cover.

[0025] Figure 4 This is an exploded view of the front cover and seed metering disc in the positive pressure high-speed precision seed metering device of this utility model.

[0026] Figure 5 This is a cross-sectional view of the internal structure of the front cover in the positive pressure high-speed precision seed metering device of this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Main body; 2. Seed tray; 3. Power unit; 4. Seed feeding pipe; 5. Seed dispensing pipe; 8. Seed cleaner; 11. Seed inlet; 12. Air inlet; 13. Seed unloading port; 14. Exhaust port; 21. Hole; 61. Hole cleaning wheel; 62. First support; 71. Pressure roller; 72. Second support; 111. Main housing; 112. Front cover; 113. Outer sealing ring; 114. Inner sealing ring; 115. Enclosure; 611. Hole cleaning teeth. Detailed Implementation

[0029] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] Example 1

[0031] like Figure 1 , 2 As shown in Figures 3, 4, and 5, the positive pressure high-speed precision seed metering device of this embodiment includes a main body 1 with an internal cavity. A circular seed disc 2 is rotatably mounted inside the main body 1. The seed disc 2 divides the internal cavity of the main body 1 into a seed metering chamber and a positive pressure chamber, which are located at opposite ends of the seed disc 2. The main body 1 is equipped with a power device 3 connected to the center of the seed disc 2 and driving its rotation. The seed disc 2 has multiple axially penetrating holes 21 near its edge along the circumferential direction. The main body 1 is provided with a positive pressure chamber... The cavity is connected to the exhaust port 14. The upper part of the main body 1 is provided with a seed inlet 11 and an air inlet 12 that are respectively connected to the seed dispensing cavity. The lower part of the seed dispensing cavity is provided with a seed dispensing port that penetrates the main body 1. The seed dispensing cavity is provided with a vertical upper seed tube 4 that is connected to the seed dispensing port. The upper end of the upper seed tube 4 is close to the hole 21 of the seed tray 2. The bottom of the seed dispensing cavity is provided with an openable seed unloading port 13. The positive pressure cavity is provided with a sealing structure corresponding to the position of the upper seed tube 4. The sealing structure is used to seal or open each of the holes 21 passing through it.

[0032] In this embodiment, the positive pressure high-speed precision seed metering device is used by a power unit 3 to drive the seed disc 2 to rotate. Simultaneously, seeds enter through the seed inlet 11 at the top of the device, and the falling seeds enter the seed metering chamber. At the same time, pressurized gas is introduced through the air inlet 12. The pressurized gas enters the seed metering chamber and then passes through the perforation 21 on the seed disc 2, forming a "positive pressure" (the airflow direction is: seed metering chamber -- perforation 21 -- positive pressure chamber -- exhaust port 14, discharged to the outside air). As the seed disc 2 rotates, the airflow passes through the perforation 21... The seeds are pressed against the opening of the orifice 21 under positive pressure. Due to the special design of the orifice 21, the seeds do not pass through it to reach the positive pressure chamber. Under the action of the positive pressure airflow, the seeds are pressed against the opening of the orifice 21. When the seed tray 2, carrying the seeds from the orifice 21, moves to the sealing structure, the orifice 21 is blocked, and the airflow cannot pass through. The positive pressure fails, and the seeds fall from the orifice 21 at the sealing structure. This position is exactly above the upper seed tube 4, and the seeds fall into the upper seed tube 4. The overall structural design is relatively reasonable. By pressing the seeds with positive pressure, dust can be prevented from entering the seed metering device, improving the performance and reliability of the seed metering device. In addition, the use of positive pressure airflow to transport seeds can shorten the falling time deviation of adjacent seeds and improve the consistency of sowing spacing.

[0033] In this embodiment, a rectifier plate is provided near the air inlet 12 inside the main body 1 to adjust the direction of positive pressure airflow.

[0034] In a preferred embodiment, the main body 1 includes a main housing 111 and a front cover 112. One end of the main housing 111 is open, and the front cover 112 is detachably and sealed to the open end of the main housing 111. The front cover 112 is provided with the exhaust port 14. The upper part of the main housing 111 is provided with the seed inlet 11 and the air inlet 12. The lower part of the main housing 111 is provided with the seed unloading port 13 and the seed discharge port. The main housing 111 is equipped with the power device 3.

[0035] In the above implementation scheme, the main body 1 adopts a split shell design, which facilitates disassembly and maintenance as well as the repair and replacement of internal components.

[0036] More specifically, in this embodiment, the main housing 111 is cylindrical in appearance, and the front cover 112 is similarly cylindrical. An exhaust port 14 for downward exhaust is provided on the end face of the front cover 112 opposite to the main housing 111. The shape design is reasonable and the dynamic cooperation with the internal seed plate 2 and other components is relatively compact.

[0037] In a preferred embodiment, one end of the main housing 111 is provided as a first annular end face, one end of the front cover 112 is provided as a second annular end face, an outer sealing ring 113 is sandwiched between the first end face and the second end face, and an inner sealing ring 114 is embedded in the front cover 112 to seal and contact the end face of the seed disc 2.

[0038] In the above implementation scheme, the double sealing design of the outer sealing ring 113 and the inner sealing ring 114 enables the positive pressure gas inside to effectively pass through the seed discharge chamber, the shaped hole 21, the positive pressure chamber, and the exhaust port 14, thereby enabling the seeds to be effectively planted one by one.

[0039] In this embodiment, the outer sealing ring 113 and the inner sealing ring 114 can be two independent components or they can be integrally formed.

[0040] In this embodiment, an air inlet pipe is connected at the air inlet 12 (outside the seed meter).

[0041] It should be further explained that ear seats are respectively provided on both sides of the first end face and both sides of the second end face of the main housing 111. The ear seats fit together and are locked or opened by a locking structure. The locking structure can be a butterfly knob that passes through the ear seat on the main housing 111 or the front cover 112. The butterfly knob is installed on one of the ear seats and is threaded to the other ear seat. Alternatively, the butterfly knob can be replaced by an existing latch (such as a snap fastener), as long as it can satisfy the requirement of locking the front cover 112 and the main housing 111 after assembly, or making it easy to open when needed.

[0042] In a preferred embodiment, a seed cleaner 8 is installed in the seed discharge chamber via a connecting frame, which is close to the hole 21 of the seed tray 2.

[0043] In the above implementation scheme, 1-3 seeds will be "pressed" at the opening of the general hole 21 under the action of "positive pressure". The design of the seed cleaner 8 makes the excess seeds at the opening of the hole 21 scraped off before the seed disc 2 rotates to the sealing structure, leaving only 1 seed attached.

[0044] The seed cleaner 8 uses multiple circular plate-shaped components connected by a bracket, which are almost in contact with the side of the seed tray 2 corresponding to the seed discharge cavity. When the seeds attached to the outside of the hole 21 protrude, the excess seeds can be scraped off by the seed cleaner 8.

[0045] In this embodiment, the power device 3 is a servo motor, which is installed in the middle of the other end of the main housing 111 and is connected to the center of one end of the seed disc 2 through the rotating shaft b.

[0046] In this embodiment, the lower part of the main housing 111 is provided with a gate-shaped enclosure 115. The enclosure 115 is close to the seed tray 2 (the gap between the two does not allow seeds to pass through), and forms a seed dispensing area between the seed tray 2 and the lower part of the seed dispensing cavity. A material passage is formed on the side of the enclosure 115 away from the seed tray 2. A valve plate d is provided on the side of the enclosure 115 away from the seed tray 2 for adjusting the opening of the material passage. The main housing 111 is provided with a drive member c that is connected to the valve plate and drives the valve plate to move to adjust the opening of the material passage.

[0047] In this embodiment, the driving component adopts a relatively simple pull-out type pull rod, which passes through the oblique hole in the upper part of the main housing 111. By pulling outward or pushing inward, the valve plate is driven to move in the vertical plane. The valve plate is a sheet-like component. During the pulling process of the driven component, it forms an oblique upward and downward displacement, thereby adjusting the state of completely blocking the side of the enclosure 115 or partially blocking it. That is, it forms an adjustment of the opening of the feed port to ensure that the number of seeds entering the enclosure 115 is limited.

[0048] In this embodiment, the seed outlet is connected to a downwardly extending seeding tube 5.

[0049] In this embodiment, a seed feeding tube handle is fixed to the outside of the seed feeding tube 5, and a sensor is provided at the seed discharge port. A seed pressing wheel is installed at the end (i.e., the lower end) of the seed feeding tube 5.

[0050] In a preferred embodiment, the positive pressure chamber is provided with a cleaning mechanism for cleaning up broken seeds or debris in the aforementioned orifice 21.

[0051] In the above implementation scheme, the hole cleaning mechanism is designed to clean the debris remaining in the hole 21 after the seed tray 2 rotates past the sealing structure and after the seed is dropped, so as to ensure the effectiveness of positive pressure seeding in the hole 21 in the next time.

[0052] In a preferred embodiment, the hole-cleaning mechanism includes a hole-cleaning wheel 61, which is mounted on the main body 1 via a first bracket 62 rotatably connected thereto. The outer edge of the hole-cleaning wheel 61 is provided with a plurality of hole-cleaning teeth 611 spaced apart along its circumference. Any one of the hole-cleaning teeth 611 is embedded in a hole 21 and rotates with the seed disc 2 when it rotates, so that the plurality of hole-cleaning teeth 611 are rolled into the hole 21 that the current position passes through.

[0053] In the above implementation scheme, the design of the hole cleaning mechanism is quite ingenious. During the rotation of the seed disc 2, there is always a hole cleaning tooth 611 that rolls into or embeds into the hole 21, thereby pushing out (squeezing out) the debris in the hole 21.

[0054] In a preferred embodiment, the sealing structure includes a pressure roller 71, which is mounted on the main body 1 via a second bracket 72 rotatably assembled thereto. The pressure roller 71 contacts the seed disc 2 and is used to seal each of the aforementioned holes 21 passing through it. The hole-cleaning teeth 611 are located above or below the hole-cleaning roller 61 on the same side.

[0055] In the above implementation scheme, the pressure roller 71 is at least externally made of flexible rubber, which can make good contact with the side of the seed disc 2 corresponding to the positive pressure cavity. During the rotation of the seed disc 2, the pressure roller 71 can block the hole 21 that moves to its position, thereby making the "positive pressure" fail.

[0056] In this embodiment, an exhaust vent is provided in the middle of the front cover 112. The first bracket 62 and the second bracket 72 are connected by a ring, which is installed at the exhaust vent. The inner space of the ring is in communication with the exhaust vent to minimize interference with normal exhaust. The design of the exhaust vent, the first bracket 62, and the second bracket 72 is relatively compact, and the spatial layout is very reasonable.

[0057] Example 2

[0058] The seeder in this embodiment includes the positive pressure high-speed precision seed metering device from Embodiment 1.

[0059] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A positive pressure high-speed precision seed metering device, characterized in that: The device includes a main body (1) with an internal cavity. A circular seed disc (2) is rotatably mounted inside the main body (1). The seed disc (2) divides the internal cavity of the main body (1) into a seed dispensing chamber and a positive pressure chamber. The main body (1) is equipped with a power device (3) connected to the center of the seed disc (2) and driving its rotation. The seed disc (2) has multiple axially penetrating holes (21) near its edge along the circumferential direction. The main body (1) has an exhaust port (14) communicating with the positive pressure chamber. The upper part of the main body (1) has a... The seed inlet (11) and air inlet (12) are connected to the seed dispensing chamber. The lower part of the seed dispensing chamber is provided with a seed dispensing port that penetrates the main body (1). The seed dispensing chamber is provided with an upper seed tube (4) that is connected to the seed dispensing port. The upper end of the upper seed tube (4) is close to the hole (21) of the seed tray (2). The bottom of the seed dispensing chamber is provided with an openable seed unloading port (13). The positive pressure chamber is provided with a sealing structure corresponding to the position of the upper seed tube (4). The sealing structure is used to seal or open each of the holes (21) passing through it.

2. The positive pressure high-speed precision seed metering device according to claim 1, characterized in that: The main body (1) includes a main shell (111) and a front cover (112). One end of the main shell (111) is open. The front cover (112) is detachably sealed at one end of the open part of the main shell (111). The front cover (112) is provided with the exhaust port (14). The upper part of the main shell (111) is provided with the seed inlet (11) and the air inlet (12). The lower part of the main shell (111) is provided with the seed discharge port (13) and the seed discharge port. The main shell (111) is equipped with the power device (3).

3. The positive pressure high-speed precision seed metering device according to claim 2, characterized in that: One end of the main housing (111) is a first annular end face, and one end of the front cover (112) is a second annular end face. An outer sealing ring (113) is sandwiched between the first end face and the second end face. An inner sealing ring (114) is embedded in the front cover (112) and is in sealing contact with the end face of the seed disc (2).

4. The positive pressure high-speed precision seed metering device according to claim 2, characterized in that: The seed cleaning device (8) is installed in the seed discharge chamber via a connecting frame and is close to the shaped hole (21) of the seed tray (2).

5. A positive pressure high-speed precision seed metering device according to claim 2, characterized in that: The lower part of the main housing (111) is provided with a gate-shaped enclosure (115). The enclosure (115) is close to the seed tray (2) and forms a seed dispensing area between the seed tray (2) and the lower part of the seed dispensing cavity. The side of the enclosure (115) away from the seed tray (2) forms a material passage. The side of the enclosure (115) away from the seed tray (2) is provided with a valve plate for adjusting the opening of the material passage. The main housing (111) is provided with a drive member that is connected to the valve plate and drives the valve plate to move to adjust the opening of the material passage.

6. The positive pressure high-speed precision seed metering device according to claim 1, characterized in that: The seed outlet is connected to a downward-extending seed delivery tube (5).

7. A positive pressure high-speed precision seed metering device according to any one of claims 1 to 6, characterized in that: The positive pressure chamber is equipped with a hole cleaning mechanism for cleaning up broken seeds or debris in the hole (21).

8. A positive pressure high-speed precision seed metering device according to claim 7, characterized in that: The hole-cleaning mechanism includes a hole-cleaning wheel (61), which is mounted on the main body (1) via a first bracket (62) rotatably connected to it. The outer edge of the hole-cleaning wheel (61) is provided with a plurality of hole-cleaning teeth (611) spaced apart along its circumference. Any one of the hole-cleaning teeth (611) is embedded in a hole (21) and rotates with the seed disc (2) when it rotates, so that the plurality of hole-cleaning teeth (611) are rolled into the hole (21) that the current position passes through.

9. A positive pressure high-speed precision seed metering device according to claim 8, characterized in that: The sealing structure includes a pressure roller (71), which is mounted on the main body (1) via a second bracket (72) rotatably assembled therewith. The pressure roller (71) contacts the seed disc (2) and is used to seal each of the holes (21) passing through it. The hole-clearing teeth (611) are located above or below the hole-clearing roller (61) on the same side.

10. A seeder, characterized in that: Including the positive pressure high-speed precision seed metering device as described in any one of claims 1 to 9.

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