Air-blowing type jet-seeding seed-metering device for small-particle-size seeds

Abstract

The invention discloses a small-particle-size seed air-blowing type jet-seeding seed-metering device which is characterized by comprising a jet-seeding seed-metering device, a jet-seeding guide pipe, an air inlet pipe connecting piece, a seed filling component, a seed box and a driving assembly, and the seed box is fixedly mounted on the jet-seeding seed-metering device; the invention relates to the field of agricultural machinery, in particular to a seed-metering device capable of achieving precise seed metering of small-particle-size seeds and seed-metering into soil in an air blowing mode, and the seed-metering device is beneficial to achieving precise and efficient seed metering of the small-particle-size seeds and capable of achieving precise seed metering of the small-particle-size seeds in an air blowing mode and further capable of achieving precise seed metering of the small-particle-size seeds in an air blowing mode.

Description

Technical Field

[0001] The present invention relates to the field of agricultural machinery. Specifically, it is a seed metering device that uses the air-blowing method to achieve precise metering of small-sized seeds and shoot and sow them into the soil. Background Art

[0002] Compared with mechanical seed metering devices, air-blowing seed metering devices cause less damage to seeds and have a wider application range than mechanical seed metering devices. They are currently the focus of research on precise seed metering devices. Air-blowing seed metering devices have the advantages of strong adaptability, good versatility, no damage to seeds, and low requirements for the shape and size of seeds. However, due to the late start of precise sowing in China, especially the less application of pneumatic precise seed metering devices for small-sized seeds. At present, the pneumatic precise seed metering device for small-sized vegetables is mainly air-suction type. Taking the seeds of Brassica juncea var. tumida as the research object, its average equivalent diameter is about 1.3 mm, and the single-grain mass is about 1.6 g. If it falls freely, the sowing uniformity is low, the operation speed is uncontrollable, and the operation mechanism of small-sized seeds in pneumatic seed metering is not clear, and there is little relevant research. Therefore, taking the seeds of Brassica juncea var. tumida as an example, the design and research of an air-blowing shooting and sowing seed metering device for small-sized seeds are carried out, and the forced seed throwing is carried out by the air-blowing shooting and sowing method to achieve precise and high-speed sowing of small-sized seeds. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an air-blowing shooting and sowing seed metering device for small-sized seeds, which is beneficial to realizing precise and high-efficiency seed metering of small-sized seeds.

[0004] An air-blowing shooting and sowing seed metering device for small-sized seeds, characterized in that it includes: a shooting and sowing seed metering device, a shooting and sowing conduit, an air inlet connecting piece, a seed filling component, a seed box and a driving component, the seed box is fixedly installed on the shooting and sowing seed metering device; the shooting and sowing conduit is fixedly installed on the shooting and sowing seed metering device, and the driving component is installed in the shooting and sowing seed metering device.

[0005] As a further limitation of this technical solution, the shooting and sowing seeder includes a front end cover, a rear end cover, an end cover opening, a sowing disc, a seed cleaning brush, and a restricting brush; the front end cover is fixedly connected to the rear end cover; a sowing opening is provided on the front end cover, the sowing disc is fixedly arranged between the front end cover and the rear end cover, and a mold hole 1 is provided on the sowing disc. There are several mold holes 1, which are evenly arranged in a circumferential manner on the arc-shaped wall surface of the sowing disc. The seed cleaning brush and the restricting brush are fixedly connected to the rear end cover. The seed cleaning brush is used to clean the excess seeds in the mold hole 1, and the restricting brush is used to restrict the movement of the seeds in the sowing disc. The included angle between the seed cleaning brush and the restricting brush is 135°, which limits the range of the seed filling area. The seed filling component includes a flow control valve, a valve control connecting rod, and a seed filling box; the flow control valve is fixedly connected to the rear end cover, and the valve control connecting rod is fixedly connected to the flow control valve; the valve control connecting rod is rotatably connected to the rear end cover, and an opening is provided on the rear end cover. The valve control connecting rod passes through the opening and can swing within the opening. The seed filling box is fixedly connected to the rear end cover, and the flow control valve is arranged inside the seed filling box.

[0006] As a further limitation of this technical solution, the shooting and sowing conduit includes a shooting and sowing pipe air pipe joint, a shooting and sowing seed guiding pipe, and a shooting and sowing pipe. The shooting wave pipe air pipe joint is arranged at one end of the shooting and sowing seed guiding pipe. The other end of the shooting and sowing seed guiding pipe is fixedly provided with the shooting and sowing pipe. The shooting and sowing seed guiding pipe is in an r shape, and the third end fixedly passes through the arc-shaped wall surface of the front end cover. The third end of the shooting and sowing seed guiding pipe corresponds to the position of the sowing opening. The shooting and sowing air pipe joint is connected to a high-pressure blower, and the high-pressure blower is used to blow out high-speed air flow.

[0007] As a further limitation of this technical solution, the driving assembly includes a driving motor, a driving blade, and a driving blade fixing cover. The driving motor is fixed inside the motor bracket, and the motor bracket is fixed at the center inside the rear end cover. The motor shaft of the driving motor is fixedly connected to the central shaft of the driving blade. The driving blade is externally covered and fixedly provided with the driving blade fixing cover. The driving blade fixing cover is fixedly arranged at the center of the sowing disc. Through the fixation of the driving blade fixing cover with the driving blade, the motor shaft, and the sowing disc, the sowing disc rotates as the driving blade rotates.

[0008] As a further limitation of this technical solution, a seed inlet is provided on the rear end cover.

[0009] As a further limitation of this technical solution, an air inlet connecting piece is installed on the rear end cover, and the air inlet connecting piece is connected to a high-pressure blower.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are:

[0011] 1. The broadcast seeder mentioned in the present invention can achieve precise seeding of small-sized vegetable seeds such as stem tumor mustard according to agronomic requirements.

[0012] 2. The broadcast seeder mentioned in the present invention can broadcast seeds at high speed to ensure the seeding efficiency.

[0013] 3. The broadcast seeder mentioned in the present invention integrates lightweight, convenience, and simplicity, providing more possibilities for the application scope of the device. It can also adjust the seeding situation by controlling the air pressure and the rotation speed of the seed plate to adapt to the specific environment.

[0014] 4. The broadcast seeder mentioned in the present invention uses the air-blowing method to fill seeds and realizes broadcast seeding by using high-speed airflow to carry seeds, and has low requirements for the airtightness of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments and descriptions thereof are used to explain the present application and do not constitute an improper limitation to the present application. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0016] Figure 1 is the structural schematic of the present invention Figure 1 ;

[0017] Figure 2 is the explosion diagram of the present invention;

[0018] Figure 3 is the partial explosion diagram of the present invention;

[0019] Figure 4 is the side view of the present invention Figure 1 ;

[0020] Figure 5 is the side view of the present invention Figure 2 .

[0021] In the figure: 1. Broadcast seeder; 101. Front end cover; 1011. Seeding port; 102. Rear end cover; 103. End cover port; 104. Seed plate; 1041. Type hole; 105. Seed cleaning brush; 1051. Constraint brush; 2. Broadcast conduit; 201. Broadcast tube air pipe joint; 202. Broadcast seed guide tube; 203. Broadcast tube; 3. Seed box; 4. Drive assembly; 401. Motor end cover; 402. Motor; 403. Drive blade; 404. Drive blade fixing cover; 5. Air inlet pipe connector; 7. Seed filling component; 701. Flow control valve; 702. Valve control link; 703. Seed filling area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] An air-blowing seed-sowing metering device 1 for small-sized seeds includes: a seed-sowing metering device 1, a seed-sowing conduit 2, an air inlet connector 5, a seed-filling component 7, a seed box 3, and a driving component 4. The seed box 3 is fixedly installed on the seed-sowing metering device 1; the seed-sowing conduit 2 is fixedly installed on the seed-sowing metering device 1, and the driving component 4 is installed inside the seed-sowing metering device 1.

[0024] The seed-sowing metering device 1 includes a front end cover 101, a rear end cover 102, an end cover opening 103, a seed-sowing disk 104, a seed-cleaning brush 105, and a restricting brush 1051; the front end cover 101 is fixedly connected to the rear end cover 102; a seed-sowing opening 1011 is provided on the front end cover 101, the seed-sowing disk 104 is fixedly arranged between the front end cover 101 and the rear end cover 102, seed holes 10411 are provided on the seed-sowing disk 104, there are several of the seed holes 10411 and they are evenly arranged in a circumferential manner on the arc-shaped wall surface of the seed-sowing disk 104, the seed-cleaning brush 105 and the restricting brush 1051 are fixedly connected to the rear end cover 102, the seed-cleaning brush 105 is used to clean the excess seeds in the seed holes 10411, the restricting brush 1051 is used to restrict the movement of the seeds in the seed-sowing disk 104, the included angle between the seed-cleaning brush 105 and the restricting brush 1051 is 135°, restricting the range of the seed-filling area 703. The seed-filling component 7 includes a flow control valve 701, a valve control link 702, and a seed-filling box 3; the flow control valve 701 is fixedly connected to the rear end cover 102, the valve control link 702 is fixedly connected to the flow control valve 701; the valve control link 702 is rotatably connected to the rear end cover 102, an opening is provided on the rear end cover 102, the valve control link 702 passes through the opening and can swing in the opening, the seed-filling box 3 is fixedly connected to the rear end cover 102, and the flow control valve 701 is arranged inside the seed-filling box 3.

[0025] In this embodiment, when multiple seeds need to be sown in one hole, seed-sowing disks 104 with different thicknesses can be assembled so that the seed holes 10411 can accommodate multiple seeds to meet different sowing requirements. For example, when used for sowing non-spherical small-sized seeds such as sesame, the seed holes 1041 of the seed-sowing disk 104 can be adjusted to be oval or other shapes to adapt to seeds of different shapes.

[0026] A switchable end cover is provided at the top of the front end cover 101 of the metering device. When the seed holes 10411 are blocked or residues fall into the gap between the seed-sowing disk 104 and the end cover, the end cover opening 103 can be opened for cleaning.

[0027] The seeds flow from the seed box 3 into the seed filling port (i.e., the entrance of the seed filling area 703), and then enter the interior of the seed metering device from the seed filling port, accumulate in the seed filling area 703, and enter the seed metering port 1011 under the action of the high-pressure airflow. The seeds that can be accommodated in the shaped hole 10411 vary depending on the thickness. When the thickness is 2 mm, single seed filling can be achieved. Under the action of the high-pressure airflow, the seeds rotate in the shaped hole 1041 as the seed metering disc 104. The seeds that have not completely entered the shaped hole 1041 are brushed off by the seed cleaning brush 105, and the seeds that have completely entered the shaped hole 1041 are brought to the seed metering port 1011, and are blown into the seed metering port 1011 of the end cover from the seed metering disc 104 under the action of the high-pressure airflow inside the cavity of the seed metering device, and then enter the seeding tube 203 from the seeding port 1011. The high-speed airflow in the seeding tube 203 accelerates the seeds to be shot into the soil.

[0028] The motor 402 is controlled by a single chip microcomputer and can adjust the rotation speed of the seed disc 104 according to actual working conditions.

[0029] The seeding conduit 2 is divided into three parts: a seeding pipe air pipe joint 201, a seeding guide pipe 202, and a seeding pipe 203 for installation to avoid blockage in the pipe. The seeding guide pipe 202 is designed as a curve to prevent seeds from directly colliding with the pipe wall when they are shot from the seeding disc 104 into the seeding pipe 203.

[0030] The front cover 101 of the seeding device is provided with a seeding port 1011 connected to the outside world. There is a gap between the seeding disc 104 and the front cover 101, and the gap is 0.02-0.03mm, so as to avoid direct contact between the seeding disc 104 and the front cover 101, and ensure that the seeds will not fall out of the gap. At the same time, the airflow can be discharged from the gap through the seeding port 1011 of the front cover 101, and the connecting rod is connected to the rear cover 102 by rotating the damping knob, and the seed filling area 703 uses the damping knob to control the flow rate by toggling the connecting rod up and down.

[0031] The sowing guide tube 2 includes a sowing tube air pipe joint 201, a sowing seed guide tube 202 and a sowing tube 203. The sowing tube air pipe joint is arranged at one end of the sowing seed guide tube 202. The sowing tube 203 is fixedly arranged at the other end of the sowing seed guide tube 202. The sowing seed guide tube 202 is R-shaped and the third end is fixed through the arc-shaped wall surface of the front end cover 101. The third end of the sowing seed guide tube 202 corresponds to the position of the seed discharge port 1011. The sowing tube air pipe joint is connected to a high-pressure fan, and the high-pressure fan is used to blow out high-speed airflow.

[0032] Furthermore, the broadcasting tube 203 can be connected to an airflow regulating device, such as an airflow sensor and an automatic regulating valve, to achieve more precise airflow control and ensure the stability and uniformity of the seeds during the broadcasting process;

[0033] The shooting and sowing air flow pressure can be adjusted according to different soil moisture conditions to ensure the soil entry effect of seeds;

[0034] When sowing small-diameter seeds with different diameters, sowing tubes 203 with different diameters can be assembled to ensure the sowing effect.

[0035] The driving assembly 4 includes a driving motor 402, driving blades 403, and a driving blade fixing cover 404. The driving motor 402 is fixed within the motor 402 bracket, and the motor 402 bracket is fixed at the center within the rear end cover 102. The motor 402 shaft of the driving motor 402 is fixedly connected to the central shaft of the driving blades 403. The driving blades 403 are externally covered and fixed with the driving blade fixing cover 404, and the driving blade fixing cover 404 is fixedly arranged at the center of the seed discharging disc 104. Through the fixation of the driving blade fixing cover 404 with the driving blades 403, the motor 402 shaft, and the seed discharging disc 104, the seed discharging disc 104 rotates along with the rotation of the driving blades 403.

[0036] In this embodiment, the driving blades 403 are fixed to the motor 402 shaft and the seed discharging disc 104 through the driving blade fixing cover 404, so that the seed discharging disc 104 rotates along with the rotation of the driving blades 403. The driving motor 402 drives the driving blades 403 and the driving blade fixing cover 404 to rotate, realizing the rotation of the seed discharging disc 104.

[0037] The seed discharging disc 104 can be selected with different thicknesses according to agronomic requirements.

[0038] There is a seed inlet left on the rear end cover 102 of the seed discharging disc 104.

[0039] There is a gap of 0.3 mm between the seed discharging disc 104 and the end cover.

[0040] An air inlet pipe connector 5 is installed on the rear end cover 102, and the air inlet pipe connector 5 is connected to a high-pressure blower. The air inlet pipe connector 5 is connected to an air compressor. Through the input of high-pressure air flow by the air compressor for pressurization, the movement speed of seeds in the sowing tube 203 is increased.

[0041] In the present invention, a seed discharging disc 104 with a suitable thickness is selected according to agronomic requirements and sowing needs. If multiple seeds need to be sown in one hole, a seed discharging disc 104 that can accommodate the corresponding number of seeds at the seed discharging port 1011 is assembled; if used for sowing non-spherical small-diameter seeds such as radishes, the shaped holes 1041 of the seed discharging disc 104 are adjusted to be oval or other adapted shapes; a sowing tube 203 with a suitable diameter is selected according to the diameter of the sown seeds. At the same time, according to different soil moisture conditions, the shooting and sowing air flow pressure is adjusted through an air flow regulating device (such as an air flow sensor and an automatic regulating valve) connected to the sowing tube 203.

[0042] Taking the seeds of tumorous stem mustard as an example for calculation, according to the Agricultural Machinery Handbook, the diameter of the existing seed metering disc 104 is generally 140 - 260 mm. When designing the size of the seed metering disc 104, considering that a larger diameter of the seed metering disc 104 is beneficial to the seed filling performance, but the power required by the high-pressure blower also increases accordingly. Therefore, in this paper, the diameter of the seed metering disc 104 is designed to be 200 mm and the thickness is 2 mm. In addition, the number of holes 1041 on the seed metering disc 104 is also an important factor affecting the seed metering performance of the seed metering device. The number of holes 1041 on the seed metering disc 104 is calculated according to Formulas 1 and 2.

[0043]

[0044] In the formula, n is the rotational speed of the seed metering disc, r / s

[0045] v is the linear velocity of the hole, m / s

[0046] D is the diameter of the annular arrangement of the holes 1041 on the seed metering disc 104, mm

[0047] According to the requirements of the pneumatic seeder in the Agricultural Machinery Handbook, its operating speed is generally 6 km / h, and the slip rate is generally taken as 2%. According to the agronomic requirements, the plant spacing of tumorous stem mustard is 30 - 45 mm. In this paper, 30 mm is taken as the standard plant spacing, and the rotational speed of the seed metering device can be obtained. The number of holes 1041 can be calculated according to Formula 2.

[0048]

[0049] In the formula, N is the number of holes 1041, P is the operating speed of the tractor, km / h

[0050] A is the seeding plant spacing, in mm

[0051] n is the rotational speed of the seed metering disc, in r / s

[0052] δ r —The slip rate of the driving wheel.

[0053] As the air flow velocity increases, the seed particles collide more strongly in the pipe. According to the theory of gas-solid two-phase flow hypothesis, the particles introduced into the air flow will be subject to various forces, including the gravitational force G, that is, the drag force Fr of the air flow and the buoyancy force Ff. According to Newton's second law of motion, it can be determined as follows:

[0054]

[0055] is the velocity of the seed in the air, in m / s;

[0056] t is the instantaneous velocity of the seed movement, in s;

[0057] m is the weight of the seed, in kg;

[0058] F is the resultant force acting on the seed, with the unit of N.

[0059] The kinematic model of the seed conveying process is shown by the following formula:

[0060]

[0061] v x0 is the initial velocity in the horizontal direction, with the unit of m / s;

[0062] v y0 is the initial velocity in the vertical direction, with the unit of m / s;

[0063] v z0 is the initial velocity perpendicular to the direction of the metering disc 104, with the unit of m / s;

[0064] L x is the displacement in the horizontal direction, with the unit of m;

[0065] L y is the displacement in the vertical direction, with the unit of m;

[0066] L z is the displacement in the direction of the vertical suction cup, with the unit of m;

[0067] Vy is the velocity perpendicular to the direction of the metering disc 104, with the unit of m / s;

[0068] Vx is the velocity parallel to the direction of the metering disc 104, with the unit of m / s;

[0069] Vz is the velocity perpendicular to the side surface of the metering disc 104, with the unit of m / s;

[0070] t is the falling time, with the unit of s.

[0071] The initial velocity of the seed is determined by the positive pressure it receives in the metering hole 1041 of the metering disc 104. The positive pressure p when the seed enters the sowing tube 203 from the metering disc 104 has an impact on the seed for a short time t Δ The influence, and this relationship can be expressed by the following formula:

[0072] pst Δ =mv z0 (5)

[0073] where, t Δ represents the short time, m represents the seed mass, and p represents the positive pressure.

[0074] The fluid resistance is caused by the relative motion between the particles and the fluid. When the air velocity significantly exceeds the seed velocity, it acts as a propulsive force to propel the seed. It can be expressed as follows:

[0075]

[0076] F D is the drag force of the seeds in the air flow, with the unit of N;

[0077] C D is the drag coefficient;

[0078] ρ is the fluid density, with the unit of kg / m 3 ;

[0079] A is the maximum area of the particle cross-section, with the unit of m 2 ;

[0080] v△ is the relative velocity between the seeds and the fluid, with the unit of m / s.

[0081] The interaction between the seeds and the pipe wall should not be considered. The seeds are under the combined action of the high-speed air flow thrust and gravity, resulting in continuous acceleration in the vertical direction. According to Newton's second law, it can be derived from the acceleration equation of the seeds as follows:

[0082]

[0083] F D is the drag force of the seeds in the air flow, with the unit of N;

[0084] G is the gravitational force of the seeds, with the unit of N;

[0085] r m is the radius of the seeds, with the unit of m;

[0086] v m is the velocity in the air flow, with the unit of m / s;

[0087] ρ m is the air density, with the unit of kg / m 3 .

[0088] The acceleration process of the stem mustard seeds in the injection tube 203 can be determined by formulas (6) and (7):

[0089]

[0090] where: C D is the drag coefficient;

[0091] v m is the velocity in the air flow, with the unit of m / s;

[0092] G is the gravitational force of the seeds, with the unit of N;

[0093] ρ m is the air density, with the unit of kg / m 3；

[0094] ρ is the fluid density, with the unit of kg / m 3 ;

[0095] v△ is the relative velocity between the seed and the fluid, with the unit of m / s.

[0096] In the sowing tube 203, the air flow will generate pressure loss due to the wall friction and the resistance of the seeds. The pressure loss can be calculated by the Darcy - Weisbach formula:

[0097]

[0098] ΔP is the pressure loss, with the unit of Pa;

[0099] f is the friction coefficient of the inner wall of the tube;

[0100] L is the length of the sowing tube 203, with the unit of m;

[0101] D is the diameter of the sowing tube 203, with the unit of m;

[0102] ρ m is the air density, with the unit of kg / m 3 ;

[0103] v is the air flow velocity, with the unit of m / s.

[0104] When the seed reaches the equilibrium state in the air flow, its terminal velocity can be calculated by the following formula:

[0105]

[0106] v t is the terminal velocity of the seed, with the unit of m / s;

[0107] m is the mass of the seed, with the unit of kg;

[0108] g is the acceleration due to gravity, with the unit of m / s 2 ;

[0109] ρ m is the air density, with the unit of kg / m 3 ;

[0110] A is the maximum area of the particle cross - section, with the unit of m 2 ;

[0111] C D is the drag coefficient.

[0112] The usage method of the present invention is as follows:

[0113] During use, start the drive motor 402. The motor 402 can adjust the rotation speed of the seed metering disc 104 according to the actual working conditions through single-chip microcomputer control. The motor shaft of the drive motor 402 drives the drive blade 403 to rotate. The drive blade 403 drives the seed metering disc 104 to rotate through the drive blade fixing cover 404. Seeds flow from the seed box 3 into the seed filling port and accumulate in the seed filling area 703 inside the seed metering device. At this time, the damping knob can be used to move the connecting rod up and down to adjust the flow control valve 701 and control the seed flow rate in the seed filling area 703. Under the action of high-pressure air flow, the seeds enter the seed discharging ports 1011 on the seed metering disc 104. During the rotation of the seed metering disc 104, the seeds that have not completely entered the holes 1041 are brushed off by the seed cleaning brush 105. The included angle between the seed cleaning brush 105 and the restraining brush 1051 is 135°, which limits the range of the seed filling area 703. The restraining brush 1051 restrains the movement of the seeds in the seed metering disc 104. The seeds that have completely entered the holes 1041 are brought to the seed discharging ports 1011. Under the action of the high-pressure air flow inside the cavity of the seed metering device, they are blown from the seed metering disc 104 into the seed discharging ports 1011 of the end cover, and then enter the seed shooting tube 203. The high-pressure blower connected to the air pipe joint 201 of the seed shooting tube blows out high-speed air flow, so that the seeds are accelerated in the seed shooting tube 203 and are shot into the soil through the seed shooting guiding tube 202 (designed as a bend to avoid direct collision of the seeds with the tube wall). During use, if the seed discharging ports 1011 are blocked or residues fall into the gap between the seed metering disc 104 and the end cover, the end cover opening 103 at the top of the front end cover 101 of the seed metering device can be opened for cleaning. There is a gap of 0.02 - 0.03 mm between the seed metering disc 104 and the front end cover 101, which not only avoids direct contact but also prevents seeds from falling, and the air flow can be discharged from the gap through the seed discharging ports 1011 of the front end cover 101. There is a gap of 0.3 mm between the seed metering disc 104 and the rear end cover 102.

[0114] The specific embodiments of the present invention disclosed above are only for illustration. However, the present invention is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A small-size seed air-blowing broadcasting device (1), characterized in that it comprises: A broadcast seed metering device (1), a broadcast seeding duct (2), an air inlet pipe connector (5), a seed filling component (7), a seed box (3) and a drive assembly (4), wherein the seed box (3) is fixedly mounted on the broadcast seed metering device (1); the broadcast seeding duct (2) is fixedly mounted on the broadcast seed metering device (1), and the drive assembly (4) is mounted in the broadcast seed metering device (1).

2. The small-size seed air-blowing broadcasting device (1) according to claim 1 is characterized in that: The broadcast seed metering device (1) comprises a front cover (101), a rear cover (102), an end cover opening (103), a seeding disc (104), a seed cleaning brush (105) and a restraining brush (1051); the front cover (101) is fixedly connected to the rear cover (102); the front cover (101) is provided with a seeding opening (1011); the seeding disc (104) is fixedly arranged between the front cover (101) and the rear cover (102); 102), the seeding disc (104) is provided with a shaped hole (1041) 1, and the shaped holes (1041) 1 are multiple and evenly arranged on the arc-shaped wall surface of the seeding disc (104), the seed cleaning brush (105) and the restraining brush (1051) are fixedly connected to the rear end cover (102), the seed cleaning brush (105) is used to clean the excess seeds in the shaped hole (1041) 1, and the restraining brush (1051) is used to clean the excess seeds in the shaped hole (1041) 1. 051) is used to constrain the movement of seeds in the seeding disk (104); the angle between the seed cleaning brush (105) and the constraining brush (1051) is 135°, limiting the range of the seed filling area (703); the seed filling component (7) comprises a flow control valve (701), a valve control connecting rod (702) and a seed filling box (3); the flow control valve (701) is fixedly connected to the rear end cover (102), and the valve control connecting rod (702) is fixedly connected to the flow control valve (701); the valve control connecting rod (702) is rotatably connected to the rear end cover (102), an opening is provided on the rear end cover (102), the valve control connecting rod (702) passes through the opening and can swing in the opening; the seed filling box (3) is fixedly connected to the rear end cover (102), and the flow control valve (701) is arranged in the seed filling box (3).

3. The small-size seed air-blowing broadcasting device according to claim 2, characterized in that: The sowing guide tube (2) comprises a sowing tube air pipe joint (201), a sowing seed guide tube (202) and a sowing tube (203); the sowing tube air pipe joint is arranged at one end of the sowing seed guide tube (202); the sowing tube (203) is fixedly arranged at the other end of the sowing seed guide tube (202); the sowing seed guide tube (202) is R-shaped and the third end is fixedly passed through the arc-shaped wall surface of the front end cover (101); the third end of the sowing seed guide tube (202) corresponds to the position of the seed discharge port (1011); the sowing tube air pipe joint is connected to a high-pressure fan, and the high-pressure fan is used to blow out high-speed airflow.

4. The small-size seed air-blowing broadcasting device according to claim 2, characterized in that: The driving assembly (4) comprises a driving motor (402), a driving blade (403), and a driving blade fixing cover (404); the driving motor (402) is fixed in the motor (402) bracket; the motor (402) bracket is fixed in the center of the rear end cover (102); the motor (402) shaft of the driving motor (402) is fixedly connected to the central axis of the driving blade (403); the driving blade (403) is covered with and fixed with a driving blade fixing cover (404); the driving blade fixing cover (404) is fixedly arranged in the center of the seeding disk (104); and the driving blade fixing cover (404) is fixed to the driving blade (403), the motor (402) shaft and the seeding disk (104), so that the seeding disk (104) rotates as the driving blade (403) rotates.

5. The small-size seed air-blowing broadcasting device according to claim 2, characterized in that: The rear end cover (102) is provided with a seed inlet.

6. The small-size seed air-blowing broadcasting device according to claim 1, characterized in that: An air intake pipe connector (5) is installed on the rear end cover (102), and the air intake pipe connector (5) is connected to the high-pressure blower.

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