Self-cleaning seed meter and method of designing same

Abstract

The application relates to a self-cleaning seed sowing device and a design method thereof, which comprises a front shell, a seed sowing disc, a sealing ring, a driving shaft, a bottom shell and an air inlet pipe, wherein the front shell is connected with the bottom shell, a cavity is formed between the front shell and the bottom shell, the seed sowing disc, the sealing ring and the driving shaft are arranged in the cavity, the seed sowing disc is connected with the driving shaft, the back surface of the seed sowing disc is tightly attached to the sealing ring, the air inlet pipe is fixed on the bottom shell, and the air inlet pipe is sealingly connected with the bottom shell. The self-cleaning seed sowing device and the design method thereof can guide the design of the seed sowing device, shorten the development cycle of the seed sowing device, reduce the development cost, reduce the dust accumulation in the seed sowing device, automatically discharge the dust of the seed sowing device, reduce the maintenance cost, improve the reliability and service life of the seed sowing device.

Description

Technical Field

[0001] This invention relates to the field of seed metering technology, and in particular to a self-cleaning seed metering device and its design method. Background Technology

[0002] Air suction seed metering devices are characterized by high seed metering accuracy and good seed size adaptability, and are widely used in precision seeders. The negative pressure chamber of an air suction seed metering device is typically formed by the seed disc, sealing ring, and bottom shell. When negative pressure is applied to the seed metering device, air enters the device through the air inlet located on the housing, and further passes through the suction holes of the seed disc into the negative pressure chamber. During sowing operations, a large amount of dust is generated, which enters the seed metering device with the air and accumulates. If too much dust accumulates, it will compromise the airtightness of the negative pressure chamber and may even cause irreversible damage to the sealing ring, severely compromising the reliability of the seed metering device. Therefore, improvements are needed.

[0003] Existing seed metering devices lack design methodologies and rely solely on experience, leading to dust accumulation on the bottom shell. The sowing environment is dusty, and dust entering the seed metering device accelerates wear on the sealing rings, reduces the airtightness of the negative pressure system, and increases maintenance costs. The existing seed metering device's bottom shell structure is complex, with multiple annular grooves. Dust enters the device under negative pressure and easily accumulates in the shell, making automatic removal difficult. It requires periodic cleaning by the operator, severely impacting sowing accuracy and the device's reliability.

[0004] Patent CN110754177 provides a dust-proof device adapted to a pneumatic seed metering device. The dust-proof device, fixed below the pneumatic seed metering device, consists of a shaping driven wheel, a shaping driven wheel shaft, an acceleration driven wheel, an acceleration driven wheel shaft, and a sealing brush. The dust-proof device is fixed below the pneumatic seed metering device, and the shaping drive wheel and shaping driven wheel are rotatably mounted on the side of the dust-proof housing. Sealing brushes are fixed on both sides of the drive acceleration wheel and driven acceleration wheel. However, this dust-proof device is only applicable to specific seed metering devices, lacks universality, and has a complex structure requiring an additional drive system. Furthermore, this device can disrupt seed metering uniformity, making it counterproductive. Summary of the Invention

[0005] In view of this, the present invention provides a self-cleaning seed meter.

[0006] Specifically, the present invention is achieved through the following technical solution:

[0007] According to a first aspect of the present invention, a self-cleaning seed metering device is provided, comprising: a front shell, a seed metering disc, a sealing ring, a drive shaft, a bottom shell, and an air inlet pipe, wherein the front shell is connected to the bottom shell, forming a cavity between them, the seed metering disc, the sealing ring, and the drive shaft are disposed inside the cavity, the seed metering disc is connected to the drive shaft, the back of the seed metering disc is in close contact with the sealing ring, and the air inlet pipe is fixed to the bottom shell and is sealed to the bottom shell.

[0008] Preferably, the seed metering disc is provided with suction holes distributed in a circular pattern above it.

[0009] Preferably, an air inlet is provided on the upper part of the bottom shell.

[0010] Preferably, the bottom shell is provided with a sealing groove, and the sealing ring is disposed in the sealing groove.

[0011] Preferably, a negative pressure channel is provided on the bottom shell, and the air inlet pipe, the negative pressure channel, the sealing ring and the seed metering disc together form a negative pressure air chamber.

[0012] Preferably, the bottom of the bottom shell is provided with a soil discharge port.

[0013] Preferably, the bottom shell is provided with an air inlet, and the inner surface of the bottom shell is provided with an arc-shaped structure.

[0014] Preferably, the air inlet is located in the middle of the arc-shaped structure.

[0015] Preferably, the drive shaft is located at the center hole of the bottom shell.

[0016] According to a second aspect of the present invention, a method for designing a self-cleaning seed meter is provided, the self-cleaning seed meter comprising any of the self-cleaning seed meters described above, the method comprising the steps of:

[0017] Determine the number, diameter, and area of ​​suction holes on the seed metering disc of the self-cleaning seed meterer;

[0018] The locations of the air inlet, air supply inlet, and soil discharge outlet are determined based on the structure of the seed metering disc.

[0019] The air intake area of ​​the air intake and the air replenishment area of ​​the air replenishment port are determined based on the area of ​​the air intake port and the area of ​​the suction hole.

[0020] The relationship between the air intake area and the suction port area is as follows:

[0021] δ[(Q1×μ+Q2(1-μ))×P1]≥|Q3×P2|

[0022] Where δ represents the safety factor, Q1 represents the air inlet area, Q2 represents the air replenishment area, Q3 represents the suction port area, P1 represents atmospheric pressure, P2 represents the effective suction port pressure, and μ represents the air flow distribution ratio between the air inlet and the air replenishment port.

[0023] The technical solution provided by this invention brings at least the following beneficial effects:

[0024] The self-cleaning seed metering device and its design method provided in this application can guide the design of seed metering devices, shorten the development cycle of seed metering devices, reduce development costs, reduce dust accumulation inside the seed metering device, and realize automatic dust discharge of the seed metering device, reduce maintenance costs, and improve the reliability and service life of the seed metering device. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a self-cleaning seed metering device provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the bottom shell of a self-cleaning seed metering device provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the back of the bottom shell of a self-cleaning seed meter provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the arc-shaped structure of the bottom shell of a self-cleaning seed metering device provided in an embodiment of the present invention;

[0031] Figure 5 This invention provides a schematic diagram of the soil discharge route in the bottom shell of a self-cleaning seed metering device.

[0032] Figure 6 A schematic diagram of the soil discharge port in a self-cleaning seed metering device provided in an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the suction hole in a self-cleaning seed metering device provided in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of a sealing ring in a self-cleaning seed metering device provided in an embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Figure 1-8 A self-cleaning seed metering device is schematically shown.

[0037] Reference Figure 1 As shown, this application provides a self-cleaning seed metering device, including: a front shell 1, a seed metering disc 2, a sealing ring 3, a drive shaft 4, a bottom shell 5, and an air inlet pipe 6. The front shell 1 is connected to the bottom shell 5, forming a cavity between them. The seed metering disc 2, the sealing ring 3, and the drive shaft 4 are disposed inside the cavity. The seed metering disc 2 is connected to the drive shaft 4. The back of the seed metering disc 2 is in close contact with the sealing ring 3. The air inlet pipe 6 is fixed to the bottom shell 5 and is sealed to the bottom shell 5.

[0038] Specifically, the seed metering device mainly consists of a front shell 1, a seed metering disc 2, a sealing ring 3, a drive shaft 4, a bottom shell 5, and an air inlet pipe 6. The front shell 1 and the bottom shell 5 are tightly connected, forming a cavity structure inside. The seed metering disc 2, the sealing ring 3, and the drive shaft 4 are located inside the cavity. The seed metering disc 2 is fixedly connected to the drive shaft 4, and the back of the seed metering disc 2 is in close contact with the sealing ring 3. The seed metering disc 2 can rotate with the drive shaft 4. The air inlet pipe 6 is fixed to the other side of the bottom shell 5, and the two are sealed together.

[0039] In this embodiment of the application, suction holes 21 distributed in a circular pattern are provided above the seed metering disc 2.

[0040] like Figure 7 Specifically, suction holes 21 are distributed in a circular pattern above the seed metering disc 2.

[0041] In this embodiment of the application, an air inlet 51 is provided on the upper part of the bottom shell 5.

[0042] Specifically, the air inlet 51 is located on the upper part of the bottom shell 5 and is used for air intake.

[0043] In this embodiment of the application, a sealing and fixing groove 52 is provided on the bottom shell 5, and the sealing ring 3 is disposed in the sealing and fixing groove 52.

[0044] Specifically, the sealing groove 52 is used to install the sealing ring 3.

[0045] In this embodiment, a negative pressure channel 53 is provided on the bottom shell 5, and the air inlet pipe 6, the negative pressure channel 53, the sealing ring 3 and the seed metering disc 2 together form a negative pressure air chamber.

[0046] Specifically, the negative pressure chamber is formed by the air inlet pipe 6, the negative pressure channel 53, the sealing ring 3, and the seed metering disc 2, and is used to create negative pressure.

[0047] In this embodiment of the application, a soil discharge port 54 is provided at the bottom of the bottom shell 5.

[0048] Specifically, the soil discharge port 54 is used to discharge soil.

[0049] In this embodiment of the application, an air inlet 55 is provided on the bottom shell 5.

[0050] Specifically, the air inlet 55 is used for air replenishment.

[0051] In this embodiment of the application, the inner surface of the bottom shell 5 is provided with an arc-shaped structure 56.

[0052] Specifically, the curved structure 56 facilitates the sliding of dust along the wall surface.

[0053] In this embodiment, the air inlet 55 is located in the middle of the arc-shaped structure 56.

[0054] Specifically, the air inlet 55 is located in the middle of the arc-shaped structure 56 and is used for air replenishment.

[0055] In this embodiment of the application, the drive shaft 4 is disposed at the center hole of the bottom shell 5.

[0056] Specifically, the drive shaft 4 is located at the center hole of the bottom shell 5, which is beneficial for the uniform force distribution during its movement.

[0057] In this embodiment, the bottom shell 5 is provided with an air inlet 51, a sealing and fixing groove 52, a negative pressure channel 53, a soil discharge port 54, an air replenishment port 55, and an arc-shaped structure 56. The air inlet 51 is located on the upper part of the bottom shell 5, the air replenishment port 55 is located in the middle of the arc-shaped structure 56, and the soil discharge port 54 is located at the bottom of the bottom shell 5, forming a "top air inlet + middle air replenishment + bottom soil discharge" layout.

[0058] Specifically, suction holes 21 arranged in a circular pattern are provided above the seed metering disc 2; the sealing ring 3 is fixed to the bottom shell 5 through the sealing fixing groove 52; the drive shaft 4 is fixed at the center hole of the bottom shell 5, and the drive shaft 4 can rotate around the center hole; the air inlet pipe 6, the sealing channel 53, the sealing ring 3, and the seed metering disc 2 form a negative pressure air chamber. When the inlet pipe 6 is connected to negative pressure, air can only enter the negative pressure air chamber through the suction holes 21. The inner surface of the bottom shell 5 of the seed metering device has an arc-shaped structure 56, which is conducive to improving airflow and reducing the residence time of air in the bottom shell; when dust settles, it will slide down along the soil discharge path A; the soil discharge port 54 is located at the bottom of the bottom shell 5, which is conducive to dust accumulation, and the soil discharge port 54 is set as an arc-shaped outlet to facilitate the discharge of accumulated soil.

[0059] Furthermore, the advantages of the "top air intake + middle air replenishment + bottom soil discharge" layout in this application are as follows: the airflow carrying dust enters the seed metering device from the top, which helps the dust settle downwards by gravity; the middle air replenishment can further disturb the dust sliding down along the arc structure 56, accelerating the dust to fall; and the bottom soil discharge port is conducive to the natural sliding of dust.

[0060] To achieve the soil discharge function of the discharge port 54, air should be prevented from entering the seed metering device through the discharge port. Therefore, the air inlet area and suction hole area of ​​the seed metering device should satisfy the following relationship:

[0061] δ[(Q1×μ+Q2(1-μ))×P1]≥|Q3×P2|

[0062] In the formula:

[0063] δ is the safety factor, which is determined by factors such as intake efficiency, and δ≤1;

[0064] Q1 is the total area of ​​the air inlet of the seed metering device, in m2;

[0065] Q2 is the total area of ​​the air supply port of the seed metering device, in m2;

[0066] Q3 is the total area of ​​the effective suction holes of the seed metering disc (i.e., the suction holes within the sealing ring area), in m2;

[0067] P1 is atmospheric pressure, Pa;

[0068] P2 is the effective suction port pressure, in Pa;

[0069] μ is the airflow distribution ratio between the air inlet and the supplementary air outlet, where 0.4 ≤ μ ≤ 1.

[0070] The working principle of the self-cleaning seed metering device provided in this application is as follows: When the seed metering device is working, it is connected to negative pressure through the air inlet pipe 6 and enters the negative pressure air chamber formed by the air inlet pipe 6, the negative pressure channel 53, the sealing ring 3, and the seed metering plate 2. Air enters the negative pressure air chamber through the suction hole 21 on the seed metering plate 2. External air and dust enter the inside of the seed metering device through the air inlet 5,1 and the air replenishment port 55, that is, the internal cavity formed by the front shell 1 and the bottom shell 5. Some dust enters the negative pressure air chamber and is carried away from the seed metering device by the negative pressure, while some dust is deposited in the bottom shell. Because the bottom shell 5 adopts an arc surface design and has fewer grooves, the airflow field structure of the seed metering device is simplified, resulting in a shorter gas flow time, which is not conducive to dust settling. The arc surface structure 56 of the bottom shell 5 is conducive to dust sliding down the wall and accumulating in the bottom space of the bottom shell 5. The accumulated soil is gradually discharged from the soil discharge port 54 under the action of gravity and the vibration of the seed metering device.

[0071] In this embodiment, the seed metering device is generally equipped with multiple types of seed trays. Commonly used seeds with high airflow requirements should be selected to determine the number and diameter of suction holes in the seed metering tray, and the effective area of ​​the suction holes should be calculated. Based on the structure of the seed metering tray, the positions of the air inlet 51, the air supply port 55, and the soil discharge port 54 are determined. The air inlet 51 is generally located above the middle of the seed metering device, the air supply port 55 can be located slightly below the middle of the seed metering device, and the soil discharge port 54 is located at the lowest position of the seed metering device. Based on the area relationship between the air inlet 51 and the suction hole 21, the required total area of ​​the air inlet 51 and the air supply port 55 is determined, and the design is completed. Based on the soil discharge requirements and the structure of the seed metering device, the dust sliding trajectory is rationally planned, and the bottom shell wall surface is optimized.

[0072] Example:

[0073] In this embodiment, suction holes 21 arranged in a circular pattern are provided above the seed metering disc 2; the sealing ring 3 is fixed to the bottom shell 5 through the sealing fixing groove 52; the drive shaft 4 is fixed at the center hole of the bottom shell 5, and the drive shaft 4 can rotate around the center hole; the air inlet pipe 6, the sealing channel 53, the sealing ring 3, and the seed metering disc 2 form a negative pressure air chamber. When the inlet pipe 6 is connected to negative pressure, air can only enter the negative pressure air chamber through the suction holes 21. The inner surface of the bottom shell 5 of the seed metering device is an arc-shaped structure 56, which is conducive to improving airflow and reducing the residence time of air in the bottom shell; when dust settles, it will slide down along the soil discharge path A; the soil discharge port 54 is located at the bottom of the bottom shell 5, which is conducive to dust accumulation, and the soil discharge port 54 is set as an arc-shaped outlet to facilitate the discharge of accumulated soil.

[0074] Furthermore, the airflow carrying dust enters the seed metering device from the top, which helps the dust settle downwards due to gravity. The air supply in the middle further agitates the dust sliding down the curved structure 56, accelerating its descent. The bottom discharge port facilitates the natural sliding of dust. To achieve the soil discharge function of the discharge port 54, air should be prevented from entering the seed metering device through it. Therefore, the air inlet area and suction port area of ​​the seed metering device should satisfy the following relationship:

[0075] δ[(Q1×μ+Q2(1-μ))×P1]≥|Q3×P2|

[0076] In the formula:

[0077] δ is the safety factor, which is determined by factors such as intake efficiency, and δ≤1;

[0078] Q1 is the total area of ​​the air inlet of the seed metering device, in m2;

[0079] Q2 is the total area of ​​the air supply port of the seed metering device, in m2;

[0080] Q3 is the total area of ​​the effective suction holes of the seed metering disc (i.e., the suction holes within the sealing ring area), in m2;

[0081] P1 is atmospheric pressure, Pa;

[0082] P2 is the effective suction port pressure, in Pa;

[0083] μ is the airflow distribution ratio between the air inlet and the supplementary air outlet, where 0.4 ≤ μ ≤ 1.

[0084] In this embodiment, when the seed metering device is working, it is connected to negative pressure through the air inlet pipe 6 and enters the negative pressure air chamber formed by the air inlet pipe 6, the negative pressure channel 53, the sealing ring 3, and the seed metering disc 2. Air enters the negative pressure air chamber through the suction hole 21 on the seed metering disc 2. External air and dust enter the inside of the seed metering device through the air inlet 5,1 and the air replenishment port 55, that is, the internal cavity formed by the front shell 1 and the bottom shell 5. Some dust enters the negative pressure air chamber and is carried away from the seed metering device by the negative pressure, while some dust is deposited in the bottom shell. Because the bottom shell 5 adopts an arc surface design and has fewer grooves, the airflow field structure of the seed metering device is simplified, resulting in a shorter gas flow time, which is not conducive to dust settling. The arc surface structure 56 of the bottom shell 5 is conducive to dust sliding down the wall and accumulating in the bottom space of the bottom shell 5. The accumulated soil is gradually discharged from the soil discharge port 54 under the action of gravity and the vibration of the seed metering device.

[0085] In this embodiment of the application, the positions of the air inlet 51, the air replenishment inlet 55, and the soil discharge inlet 54 are determined according to the structure of the seed metering disc. The air inlet 51 is generally selected above the middle of the seed metering device, the air replenishment inlet 55 can be selected slightly below the middle of the seed metering device, and the soil discharge inlet 54 is selected at the lowest position of the seed metering device.

[0086] In this application embodiment, a self-cleaning seed meter design method is also provided, wherein the self-cleaning seed meter includes any of the self-cleaning seed meters described above, and the method includes the following steps:

[0087] Determine the number, diameter, and area of ​​suction holes on the seed metering disc of the self-cleaning seed meterer;

[0088] The locations of the air inlet, air supply inlet, and soil discharge outlet are determined based on the structure of the seed metering disc.

[0089] The air intake area of ​​the air intake and the air replenishment area of ​​the air replenishment port are determined based on the area of ​​the air intake port and the area of ​​the suction hole.

[0090] The relationship between the air intake area and the suction port area is as follows:

[0091] δ[(Q1×μ+Q2(1-μ))×P1]≥|Q3×P2|

[0092] Where δ represents the safety factor, Q1 represents the air inlet area, Q2 represents the air replenishment area, Q3 represents the suction port area, P1 represents atmospheric pressure, P2 represents the effective suction port pressure, and μ represents the air flow distribution ratio between the air inlet and the air replenishment port.

[0093] Specifically, seed metering devices are generally equipped with multiple types of seed trays. The number and diameter of suction holes in the seed metering tray should be determined by selecting commonly used seeds with high airflow requirements, and the effective area of ​​the suction holes should be calculated. Based on the structure of the seed metering tray, the positions of the air inlet, air replenishment inlet, and soil discharge outlet should be determined. The air inlet is generally selected above the middle of the seed metering device, the air replenishment inlet can be selected slightly below the middle, and the soil discharge outlet should be selected at the lowest point of the seed metering device. Based on the relationship between the air inlet and suction hole areas, the required total area of ​​the air inlet and air replenishment inlet should be determined, and the design completed. Based on the soil discharge requirements and the structure of the seed metering device, the dust sliding trajectory should be rationally planned, and the bottom shell wall surface should be optimized. The air inlet area and suction hole area of ​​the seed metering device should satisfy the following relationship:

[0094] δ[(Q1×μ+Q2(1-μ))×P1]≥|Q3×P2|

[0095] In the formula:

[0096] δ is the safety factor, which is determined by factors such as intake efficiency, and δ≤1;

[0097] Q1 is the total area of ​​the air inlet of the seed metering device, in m2;

[0098] Q2 is the total area of ​​the air supply port of the seed metering device, in m2;

[0099] Q3 is the total area of ​​the effective suction holes of the seed metering disc (i.e., the suction holes within the sealing ring area), in m2;

[0100] P1 is atmospheric pressure, Pa;

[0101] P2 is the effective suction port pressure, in Pa;

[0102] μ is the airflow distribution ratio between the air inlet and the supplementary air outlet, 0.4≤μ≤1.

[0103] In this embodiment, the seed metering device mainly consists of a front shell 1, a seed metering disc 2, a sealing ring 3, a drive shaft 4, a bottom shell 5, and an air inlet pipe 6. The bottom shell 5 is provided with an air inlet 51, a sealing and fixing groove 52, a negative pressure channel 53, a soil discharge port 54, and an air replenishment port 55. An arc-shaped structure 56 is used to connect the above parts. The air inlet 51 is located on the upper part of the bottom shell 5, the air replenishment port 55 is located in the middle of the arc-shaped structure 56, and the soil discharge port 54 is located at the bottom of the bottom shell 5, forming a "top air inlet + middle air replenishment + bottom soil discharge" layout. The seed metering disc 2 is provided with suction holes 21 distributed in a circle above it. The front shell 1 and the bottom shell 5 are tightly connected, forming a cavity structure inside. The seed metering disc 2, the sealing ring 3, and the drive shaft 4 are located inside the cavity. The sealing ring 3 is fixed to the bottom shell 5 via the sealing groove 52; the drive shaft 4 is fixed at the center hole of the bottom shell 5, and the drive shaft can rotate around the center hole; the seed metering disc 2 is fixedly connected to the drive shaft 4, and the back of the seed metering disc 2 is in close contact with the sealing ring 3, and the seed metering disc 2 can rotate with the drive shaft 4; the air inlet pipe 6 is fixed to the other side of the bottom shell 5, and the two are sealed together. The air inlet pipe 6, the sealing channel 53, the sealing ring 3, and the seed metering disc 2 form a negative pressure air chamber. When the inlet pipe 6 is connected to negative pressure, air can only enter the negative pressure air chamber from the suction hole 21. The inner surface of the bottom shell 5 of the seed meterer is an arc-shaped structure 56, which is conducive to improving airflow and reducing the residence time of air in the bottom shell; when dust settles, it will slide down along the soil discharge path A; the soil discharge port 54 is set at the bottom of the bottom shell 5, which is conducive to dust accumulation. The soil discharge port 54 is set as an arc-shaped outlet, which is conducive to the discharge of accumulated soil.

[0104] Specifically, the advantages of the "top air intake + middle air replenishment + bottom soil discharge" layout are as follows: the airflow carrying dust enters the seed metering device from the top, which helps the dust settle downwards by gravity; the middle air replenishment can further disturb the dust sliding down along the arc structure 56, accelerating the dust to fall; and the bottom soil discharge port is conducive to the natural sliding of dust.

[0105] To achieve the soil discharge function of the discharge port 54, air should be prevented from entering the seed metering device through the discharge port. Therefore, the air inlet area and suction hole area of ​​the seed metering device should satisfy the following relationship:

[0106] δ[(Q1×μ+Q2(1-μ))×P1]≥|Q3×P2|

[0107] In the formula:

[0108] δ is the safety factor, which is determined by factors such as intake efficiency, and δ≤1;

[0109] Q1 is the total area of ​​the air inlet of the seed metering device, in m2;

[0110] Q2 is the total area of ​​the air supply port of the seed metering device, in m2;

[0111] Q3 is the total area of ​​the effective suction holes of the seed metering disc (i.e., the suction holes within the sealing ring area), in m2;

[0112] P1 is atmospheric pressure, Pa;

[0113] P2 is the effective suction port pressure, in Pa;

[0114] μ is the airflow distribution ratio between the air inlet and the supplementary air outlet, 0.4≤μ≤1.

[0115] The self-cleaning seed metering device and its design method provided in this application can guide the design of seed metering devices, shorten the development cycle of seed metering devices, reduce development costs, reduce dust accumulation inside the seed metering device, and realize automatic dust discharge of the seed metering device, reduce maintenance costs, and improve the reliability and service life of the seed metering device.

[0116] It should be noted that in this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0117] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0118] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0119] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0120] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A self-cleaning seed metering device, characterized in that, include: The system comprises a front shell, a seed metering disc, a sealing ring, a drive shaft, a bottom shell, and an air inlet pipe. The front shell is connected to the bottom shell, forming a cavity between them. The seed metering disc, the sealing ring, and the drive shaft are disposed inside the cavity. The seed metering disc is connected to the drive shaft, and the back of the seed metering disc is in close contact with the sealing ring. The air inlet pipe is fixed to the bottom shell and is sealed to the bottom shell. The bottom shell has a soil discharge port at its bottom and an air supply port on its top. The inner surface of the bottom shell has an arc-shaped structure. The design method of the self-cleaning seed metering device includes the following steps: Determine the number, diameter, and area of ​​suction holes on the seed metering disc of the self-cleaning seed meterer; The locations of the air inlet, air supply inlet, and soil discharge outlet are determined based on the structure of the seed metering disc. The air intake area of ​​the air intake and the air replenishment area of ​​the air replenishment port are determined based on the area of ​​the air intake port and the area of ​​the suction hole. The relationship between the air intake area and the suction port area is as follows: Where δ represents the safety factor, Q1 represents the air inlet area, Q2 represents the air replenishment area, Q3 represents the suction port area, P1 represents atmospheric pressure, P2 represents the effective suction port pressure, and μ represents the air flow distribution ratio between the air inlet and the air replenishment port.

2. The self-cleaning seed metering device according to claim 1, characterized in that, The seed metering tray is provided with suction holes arranged in a circle above it.

3. The self-cleaning seed metering device according to claim 1, characterized in that, An air inlet is provided on the upper part of the bottom shell.

4. The self-cleaning seed metering device according to claim 1, characterized in that, The bottom shell is provided with a sealing and fixing groove, and the sealing ring is disposed in the sealing and fixing groove.

5. The self-cleaning seed metering device according to claim 1, characterized in that, The bottom shell is provided with a negative pressure channel, and the air inlet pipe, the negative pressure channel, the sealing ring and the seed metering disc together form a negative pressure air chamber.

6. The self-cleaning seed metering device according to claim 1, characterized in that, The air inlet is located in the middle of the arc-shaped structure.

7. The self-cleaning seed metering device according to claim 1, characterized in that, The drive shaft is located at the center hole of the bottom shell.

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