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

Abstract

The invention relates to a positive pressure type high-speed precision seed-metering device and a seeding machine with the same. 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] The invention 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 Art

[0002] In recent years, the efficiency of agricultural machinery operation has been gradually improved, and the seed drill has also developed rapidly towards high speed and high precision. The seed drill is the core working part of the seed drill, and its performance directly affects the operating speed of the whole machine.

[0003] At present, most existing seeders use air suction seeders, and their working principle is: seeds are adsorbed on the surface of the seeding disc under negative pressure, and rotate with the seeding disc to the seeding area, where the seeds lose adsorption and then sequentially leave the seeding disc and enter the seeding tube, and slide down along the wall of the seeding tube under the action of gravity and enter the seed bed. Overall, it has the following disadvantages:

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

[0005] ② After the air in the seed tray of the air-suction seeding device is cut off, the seeds rely on gravity and inertia to separate from the seed tray, which causes a time delay in separation from the seed tray, reducing the uniformity of sowing;

[0006] ③ The working environment of the air-suction seed meter is full of dust. The dust is sucked into the cavity of the air-suction seed meter along with the air and accumulates, affecting the performance and reliability of the seed meter.

[0007] Based on this, it is necessary to develop a positive pressure high-speed precision seed metering device to overcome the above technical problems. Summary of the invention

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

[0009] The technical solution of the present invention to solve the above technical problems is as follows:

[0010] A positive pressure type high-speed precision seed meter comprises a main body with a cavity inside, a circular seed disk rotatably provided inside the main body, the seed disk divides the cavity inside the main body into a seed metering cavity and a positive pressure cavity, the main body is equipped with a power device connected to the center of the seed disk and driving it to rotate, the seed disk is provided with a plurality of shaped holes axially penetrating it near the edge along the circumferential direction, the main body is provided with an exhaust port connected to the positive pressure cavity, the upper part of the main body is provided with a seed inlet and an air inlet respectively connected to the seed metering cavity, the lower part of the seed metering cavity is provided with a seed metering port passing through the main body, an upper seed tube connected to the seed metering port is vertically provided in the seed metering cavity, the upper end of the upper seed tube is close to the shaped hole of the seed disk, the bottom of the seed metering cavity is provided with an openable seed unloading port, and a blocking structure is provided at a position corresponding to the upper seed tube in the positive pressure cavity, the blocking structure is used to block or open each of the shaped holes passing therethrough.

[0011] Based on the above technical solution, the present invention can also be 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 and mounted 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 air inlet, the lower part of the main shell is provided with the seed unloading port and seed discharge port, and the main shell is equipped with the power device.

[0013] Furthermore, one end of the main shell is set as a first circular end face, one end of the front cover is set as a second circular 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 in contact with the seed disc end face.

[0014] Furthermore, a seed cleaning device close to the shaped hole of the seed plate is installed in the seed cavity through a connecting frame.

[0015] Furthermore, a door-shaped enclosure is provided at the lower inner portion of the main shell body, the enclosure is close to the seed tray, and forms a seed discharge area between the enclosure, the seed tray and the lower portion of the seed discharge cavity, a feed port is formed on the side of the enclosure facing away from the seed tray, a valve plate for adjusting the opening of the feed port is provided on the side of the enclosure facing away from the seed tray, and a driving member connected to the valve plate and driving the valve plate to move to adjust the opening of the feed port is provided on the main shell body.

[0016] Furthermore, the seed discharge port is connected with a seed dropping tube extending downward.

[0017] Furthermore, a hole cleaning mechanism for cleaning broken seeds or debris in the mold hole is provided in the positive pressure chamber.

[0018] Furthermore, the hole cleaning mechanism includes a hole cleaning wheel, which is mounted on the first bracket through a first bracket rotatably connected thereto, and a plurality of hole cleaning teeth are provided at intervals along the circumference of the outer edge of the hole cleaning wheel, and any one of the hole cleaning teeth is embedded in one of the mold holes, and rotates therewith when the seed disk rotates, so that the plurality of hole cleaning teeth are rollingly embedded in the mold hole passing through the current position.

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

[0020] The beneficial effects of the present invention are as follows: by attaching seeds with positive pressure, dust can be prevented from entering the seed meter, thereby improving the performance and reliability of the seed meter; in addition, by using positive pressure airflow to transport seeds, the deviation in the falling time of adjacent seeds can be shortened, thereby improving the consistency of sowing spacing.

[0021] A seeder is also provided, comprising a positive pressure high-speed precision seed meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the positive pressure high-speed precision seed metering device of the present invention;

[0023] Figure 2 It is a structural exploded view of the positive pressure type high speed precision seed metering device of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the positive pressure type high speed precision seed metering device of the present invention after removing the front cover;

[0025] Figure 4 It is a structural exploded view of the front cover and the seeding disc in the positive pressure type high-speed precision seeding device of the present invention;

[0026] Figure 5 The present invention is a cross-sectional view of the internal structure of the front cover of the positive pressure high-speed precision seed metering device.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Main body; 2. Seed tray; 3. Power device; 4. Upper seed tube; 5. Seed dropping tube; 8. Seed cleaner; 11. Seed inlet; 12. Air inlet; 13. Seed discharge port; 14. Air outlet; 21. Molded hole; 61. Hole cleaning wheel; 62. First bracket; 71. Pressing wheel; 72. Second bracket; 111. Main shell; 112. Front cover; 113. Outer sealing ring; 114. Inner sealing ring; 115. Enclosure; 611. Hole cleaning teeth. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] Example 1

[0031] like Figure 1 , 2 As shown in , 3, 4, and 5, the positive pressure type high-speed precision seed metering device of this embodiment includes a main body 1 with a cavity inside, a circular seed disc 2 is rotatably provided inside the main body 1, the seed disc 2 divides the cavity inside the main body 1 into a seeding cavity and a positive pressure cavity, the seeding cavity and the positive pressure cavity are respectively located at the two 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 it to rotate, a plurality of axially penetrating holes 21 are opened near the edge of the seed disc 2 along the circumferential direction, and the main body 1 is provided with a positive pressure An exhaust port 14 is connected to the cavity, a seed inlet 11 and an air inlet 12 are respectively connected to the seed discharging cavity on the upper part of the main body 1, a seed discharging port which passes through the main body 1 is provided at the lower part of the seed discharging cavity, an upper seed tube 4 connected to the seed discharging port is vertically provided in the seed discharging cavity, the upper end of the upper seed tube 4 is close to the shaped hole 21 of the seed plate 2, an openable seed unloading port 13 is provided at the bottom of the seed discharging cavity, a sealing structure is provided at the position corresponding to the upper seed tube 4 in the positive pressure cavity, and the sealing structure is used for sealing or opening each of the shaped holes 21 passing therethrough.

[0032] When the positive pressure high-speed precision seed metering device of this embodiment is used, the power device 3 drives the seed disc 2 to rotate. At the same time, the seeds enter from the seed inlet 11 at the upper end of the device, and the fallen seeds enter the seeding cavity. At the same time, pressurized gas is introduced through the air inlet 12, and the pressurized gas enters the seeding cavity, and then passes through the shaped hole 21 on the seed disc 2 to form a "positive pressure" (the air flow direction is: seeding cavity--shaped hole 21--positive pressure cavity--exhaust port 14, and discharged to the air). As the seed disc 2 rotates, the air flow passes through the shaped hole 21. When the seed is "pressed" at the opening of the shaped hole 21 under the action of positive pressure, due to the special design of the shaped hole 21, the seed will not pass through the shaped hole 21 to reach the positive pressure chamber. Under the action of the "positive pressure" airflow, the seed is pressed at the opening of the shaped hole 21. When the seed plate 2 moves to the blocking structure with the seed in the shaped hole 21, the shaped hole 21 is blocked, and the airflow cannot pass through. The "positive pressure" fails, and the seed will fall from the shaped hole 21 at the blocking structure. This position is just above the upper seed tube 4, and the seed will 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 meter, and the performance and reliability of the seed meter are improved. In addition, the use of positive pressure airflow to transport seeds can shorten the deviation of the falling time of adjacent seeds and improve the consistency of sowing spacing.

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

[0034] As a preferred embodiment, 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 and mounted at the open end 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 unloading port 13 and the seed discharge port. The main shell 111 is equipped with the power device 3.

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

[0036] More specifically, in this embodiment, the main housing 111 is a cylindrical housing in appearance, and the front cover 112 is similar, also a cylindrical housing, and an exhaust port 14 for exhausting downward is provided on the end surface of the front cover 112 away from the main housing 111. The shape design is reasonable, and the dynamic coordination with the internal seed tray 2 and other components is relatively compact.

[0037] As a preferred embodiment, one end of the main shell 111 is set as a first end face of a circular ring, one end of the front cover 112 is set as a second end face of a circular ring, 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 and is in sealing contact with the end face of the seed plate 2.

[0038] In the above embodiment, the double sealing design of the outer sealing ring 113 and the inner sealing ring 114 allows the internal positive pressure gas to effectively pass through the seeding cavity--molding hole 21--positive pressure cavity--exhaust port 14, so that the seeds can be effectively planted one by one.

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

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

[0041] It should be noted that ear seats are respectively provided on both sides of the first end face of the main shell 111 and both sides of the second end face. 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 seats on the main shell 111 or the front cover 112. The butterfly knob is installed on one of the ear seats and is threadedly connected to the other ear seat. Alternatively, the butterfly knob can be replaced with an existing lock buckle (such as a hasp), as long as it can meet the requirements of locking the front cover 112 and the main shell 111 after assembly, or can be easily opened when needed.

[0042] As a preferred embodiment, a seed cleaning device 8 close to the shaped hole 21 of the seed tray 2 is installed in the seed cavity through a connecting frame.

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

[0044] The seed cleaner 8 is a plurality of disc-shaped components connected by a bracket, which is almost attached to a side of the seed tray 2 corresponding to the seed cavity. When seeds attached to the outside of the shaped 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 a rotating shaft b.

[0046] In this embodiment, a door-shaped enclosure 115 is provided at the lower inner portion of the main shell 111, the enclosure 115 is close to the seed disk 2 (the gap between the two does not allow seeds to pass through), and forms a seed discharge area between the seed disk 2 and the lower portion of the seed discharge cavity, and a feed port is formed on the side of the enclosure 115 away from the seed disk 2, and a valve plate d for adjusting the opening of the feed port is provided on the side of the enclosure 115 away from the seed disk 2, and a driving member c is provided on the main shell 111, which is connected to the valve plate and drives the valve plate to move to adjust the opening of the feed port.

[0047] In this embodiment, the driving member adopts a relatively simple pull-out rod, which passes through the inclined hole on the upper part of the main shell 111, and drives the valve plate to move in the vertical plane by pulling it outward or pushing it inward. The valve plate is a sheet-like component. During the pulling process of the driven member, it forms an oblique upward and downward displacement, so that it can be adjusted to completely block the side of the enclosure 115, or a partially blocked state, that is, to adjust 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 discharge port is connected with a seed dropping pipe 5 extending downward.

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

[0050] As a preferred embodiment, a hole cleaning mechanism for cleaning the mold hole 21 is provided in the positive pressure chamber.

[0051] In the above implementation scheme, the hole cleaning mechanism is designed to clean the debris remaining in the shaped hole 21 after the seed disc 2 rotates through the blocking structure and the seeds are dropped, thereby ensuring the effectiveness of positive pressure seeding in the shaped hole 21 next time.

[0052] As 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, and a plurality of hole cleaning teeth 611 are provided at intervals along the circumference of the outer edge of the hole cleaning wheel 61, and any one of the hole cleaning teeth 611 is embedded in one of the mold holes 21, and rotates therewith when the seed disc 2 rotates, so that the plurality of hole cleaning teeth 611 are rollingly embedded in the mold hole 21 passing through the current position.

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

[0054] As a preferred embodiment, the above-mentioned sealing structure includes a pressure wheel 71, and the above-mentioned pressure wheel 71 is installed on the above-mentioned main body 1 through a second bracket 72 rotatably assembled therewith. The above-mentioned pressure wheel 71 contacts the above-mentioned seed disc 2 and is used to seal each of the above-mentioned mold holes 21 passing therethrough, and the above-mentioned hole cleaning teeth 611 are located above or below the same side of the above-mentioned hole cleaning wheel 61.

[0055] In the above embodiment, at least the outer portion of the pressure wheel 71 is made of flexible rubber, which can make good contact with the side of the positive pressure chamber corresponding to the seed disc 2. During the rotation of the seed disc 2, the pressure wheel 71 can block the mold hole 21 moved to its position, thereby making the "positive pressure" ineffective.

[0056] In this embodiment, an exhaust hole is provided in the middle of the front cover 112, and the first bracket 62 and the second bracket 72 are connected to a ring, which is installed at the exhaust hole, and the inner ring space thereof is connected to the exhaust hole, so as not to affect normal exhaust as much as possible. The design of the exhaust hole, 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 of this embodiment includes the positive pressure high-speed precision seed metering device in Example 1.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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 invention comprises a main body (1) having a cavity therein, a circular seed disc (2) being rotatably provided inside the main body (1), the seed disc (2) dividing the cavity inside the main body (1) into a row seed cavity and a positive pressure cavity, the main body (1) being provided with a power device (3) connected to the center of the seed disc (2) and driving it to rotate, the seed disc (2) being provided with a plurality of axially penetrating holes (21) near the edge thereof in the circumferential direction, the main body (1) being provided with an exhaust port (14) communicating with the positive pressure cavity, and the upper part of the main body (1) being provided with a dividing A seed inlet (11) and an air inlet (12) are respectively connected to the seed discharging chamber, the lower part of the seed discharging chamber is provided with a seed discharging port that passes through the main body (1), an upper seed tube (4) connected to the seed discharging port is vertically arranged in the seed discharging chamber, the upper end of the upper seed tube (4) is close to the molded hole (21) of the seed plate (2), and an openable seed discharge port (13) is arranged at the bottom of the seed discharging chamber, and a sealing structure is provided at the position corresponding to the upper seed tube (4) in the positive pressure chamber, and the sealing structure is used to seal or open each of the molded holes (21) passing through it.

2. A positive pressure high-speed precision seed metering device according to claim 1, characterized in that: The main body (1) comprises 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 and mounted at the open end 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. A positive pressure high speed precision seed metering device according to claim 2, characterized in that: One end of the main shell (111) is set as a first end face in the form of a circular ring, and one end of the front cover (112) is set as a second end face in the form of a circular ring. 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. A positive pressure high-speed precision seed metering device according to claim 2, characterized in that: A seed cleaning device (8) close to the shaped hole (21) of the seed plate (2) is installed in the seed cavity through a connecting frame.

5. A positive pressure high-speed precision seed metering device according to claim 2, characterized in that: A door-shaped enclosure (115) is provided at the lower inner portion of the main shell (111), the enclosure (115) is close to the seed disc (2), and forms a seed discharge area between the enclosure (115) and the seed disc (2) and the lower portion of the seed discharge cavity, a feeding port is formed on the side of the enclosure (115) facing away from the seed disc (2), a valve plate for adjusting the opening of the feeding port is provided on the side of the enclosure (115) facing away from the seed disc (2), and a driving member connected to the valve plate and driving the valve plate to move so as to adjust the opening of the feeding port is provided on the main shell (111).

6. A positive pressure high-speed precision seed metering device according to claim 1, characterized in that: The seed discharge port is connected with a seed dropping pipe (5) extending downward.

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

8. A positive pressure high speed precision seed metering device according to claim 7, characterized in that: The hole cleaning mechanism comprises a hole cleaning wheel (61), the hole cleaning wheel (61) is mounted on the main body (1) via a first bracket (62) rotatably connected thereto, a plurality of hole cleaning teeth (611) are arranged at intervals along the circumference of the outer edge of the hole cleaning wheel (61), any one of the hole cleaning teeth (611) is embedded in one of the mold holes (21), and rotates with the seed disc (2) when it rotates, so that the plurality of hole cleaning teeth (611) are rollingly embedded in the mold hole (21) passing through the current position.

9. A positive pressure high speed precision seed metering device according to claim 8, characterized in that: The blocking structure comprises a pressure wheel (71), the pressure wheel (71) being mounted on the main body (1) via a second bracket (72) rotatably assembled therewith, the pressure wheel (71) being in contact with the seed disc (2) and being used to block each of the mold holes (21) passing therethrough, and the hole cleaning teeth (611) being located above or below the same side of the hole cleaning wheel (61).

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

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