Airflow assisted fill-clear seed centrifugal corn high-speed precision seed metering device

Abstract

The present application belongs to the technical field of agricultural machinery, and relates to a centrifugal corn high-speed precision seed metering device with airflow-assisted filling and cleaning. The centrifugal corn high-speed precision seed metering device comprises a shaft, a first bearing, a rear shell, a second bearing, a seed metering disc, a hole insert, an agitator wheel, a gasket, a screw and a front shell. The bottom of the front shell is provided with a horizontal air inlet channel, and an airflow outlet is designed on the front shell to enable the airflow to flow regularly and orderly in the seed metering device chamber. The rear shell, the seed metering disc and the hole insert are designed with openings, so that the airflow can flow out through the trapezoidal openings at the bottom of the hole insert, thereby driving the seeds to flow to the bottom of the hole insert and playing an auxiliary filling role, and effectively reducing the seed missing rate of the seed metering device. An airflow outlet is designed on the front shell to enable the airflow to quickly flow out of the seed metering device and form a high-speed airflow in the seed metering device. The high-speed airflow enables the seeds to obtain a higher speed to generate a greater centrifugal force to separate from the hole insert, plays an auxiliary cleaning role, and effectively reduces the seed repetition rate.

Description

Technical Field

[0001] The invention relates to a centrifugal corn high-speed precision seed metering device with airflow-assisted seed filling and clearing, belonging to the technical field of agricultural machinery. Background Art

[0002] With the advancement of society and technology, corn production methods are moving towards more efficient and cleaner methods. Seeding is a crucial process in corn production, and its efficiency directly impacts corn yield. High-speed precision corn seeders play a crucial role in seeding operations, with their seeding speed and quality directly determining efficiency. To improve seeding speed and quality, seeders have complex structures and high energy consumption, leading to high production costs and environmental pollution. Research on a seeder with a simple structure and low energy consumption is crucial for corn production. Currently, the most widely used high-speed seeder is the pneumatic high-speed precision corn seeder. These seeders utilize airflow pressure to achieve high seeding speed and accuracy, but unstable air pressure at high speeds can result in a high rate of missed seeds. While these seeders rely on stable air pressure to achieve high-speed precision seeding, the overall structure is complex and energy-intensive. Because these seeders use a circular seeding disc, the centrifugal force increases at higher speeds, making seed filling and seed carrying more difficult. To ensure stable seed filling and seed transport, higher air pressure is required, which further increases energy consumption. A centrifugal high-speed precision corn seed meter utilizes the centrifugal effect generated by the high-speed circular motion of seeds for seed filling, seed clearing, seed placement, and seed return. This transforms the disadvantages of pneumatic high-speed precision corn seed metering devices into advantages, effectively addressing the difficulties of seed filling, seed carrying, and high energy consumption at high speeds. Further research revealed that during seed filling, two seeds can become stuck at the hole entrance, preventing them from successfully filling into the hole bottom, resulting in missed seeding. Furthermore, when seed flow is discontinuous and seed velocity is insufficient, the hole insert captures the seeds later, preventing them from filling into the hole in a timely manner, increasing the probability of seed filling failure. During seed clearing, a few seeds may not achieve sufficient velocity to escape the seed disc by centrifugal force and instead fall directly into the seed placement area, causing reseeding. To improve seed filling and seed clearing performance, a centrifugal high-speed precision corn seed meter with airflow-assisted seed filling and clearing is proposed. The bottom of the front housing features a horizontal air inlet channel, along with an air outlet designed into the front housing to ensure a regular and orderly flow of air within the seed meter chamber. Openings in the rear housing, seed tray, and hole insert allow airflow through the trapezoidal openings at the bottom of the hole insert, driving the seeds toward the bottom of the hole insert and assisting seed filling. The high-speed airflow accelerates the seeds, generating greater centrifugal force to separate them from the hole insert and assist in seed clearing. Using airflow to assist seed filling and clearing reduces the seed meter's missed and reseeded rates, improving seeding performance. Summary of the Invention

[0003] To address the high rates of missed and reseeded seeds in centrifugal high-speed precision corn seeders, a centrifugal high-speed precision corn seeder with airflow-assisted seed filling and clearing was proposed. To achieve gas-assisted seed filling and clearing, a horizontal air inlet channel is provided at the bottom of the front shell, and an airflow outlet is designed on the front shell to ensure a regular and orderly flow of air within the seeding chamber. Openings are designed in the rear shell, seeding disc, and hole plug, allowing airflow to flow out through the trapezoidal opening at the bottom of the hole plug, thereby driving the seeds to flow toward the bottom of the hole plug and assisting seed filling. The high-speed airflow causes the seeds to achieve a higher speed, generating a greater centrifugal force to separate from the hole plug, thus assisting seed clearing. This seeding device not only improves seeding performance but also has a simpler structure and lower energy consumption compared to pneumatic high-speed precision corn seeders.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing, comprising a shaft 1, a first bearing 2, a rear housing 3, a second bearing 4, a seeding disc 5, a hole plug 6, an agitating wheel 7, a gasket 8, a screw 9 and a front housing 10;

[0006] The rear housing 3 includes a circular hole 3001, an arc groove 3002, a fixed installation ear 3003, an arc-shaped slot 3004 and a rear housing center hole 3005;

[0007] A rear housing center hole 3005 is provided at the center of the rear housing 3; an arc-shaped slot 3004 is provided on the outer circumference of the rear housing 3, and the arc-shaped slot 3004 runs through the front and back for passing airflow;

[0008] The first bearing 2 is mounted on the rear surface of the rear housing 3, and the second bearing 4 is mounted on the front surface of the rear housing 3;

[0009] The shaft 1 and the rear housing 3 are coaxially mounted and connected via the first bearing 2 and the second bearing 4. The first bearing 2, the second bearing 4 and the shaft 1 are mounted in the center hole 3005 of the rear housing.

[0010] The seeding disc 5 includes a slot 5001, a bottom opening 5002, a center hole 5003 of the seeding disc and a mounting hole 5004 for the stirring wheel;

[0011] The outer circumference of the seeding disc 5 is evenly and symmetrically provided with four slots 5001; the bottom opening 5002 of the slots 5001 is used for airflow; the center of the seeding disc 5 is provided with a seeding disc center hole 5003; the disc surface of the seeding disc 5 is provided with a pair of stirring wheel mounting holes 5004 for mounting the stirring wheel 7;

[0012] The center hole 5003 of the seeding disc 5 is coaxially assembled with the shaft 1 and is installed on the front surface of the rear housing 3;

[0013] The four hole plug-ins 6 are respectively installed in the four card slots 5001 around the edges of the seed disc 5;

[0014] The stirring wheel 7 is coaxially assembled with the shaft 1 and is mounted on the front surface of the seeding disc 5 through the stirring wheel mounting hole 5004;

[0015] The washer 8 and the screw 9 are located on the front surface of the stirring wheel 7 and are connected to the shaft 1. They can lock the axial movement of the rear housing 3, the seeding disc 5 and the stirring wheel 7, so that the seeding disc 5, the hole insert 6 and the stirring wheel 7 rotate with the shaft 1;

[0016] The front housing 10 includes a seed inlet 1001, a first airflow outlet 1002, a seed inlet channel 1003, a seed return channel 1004, an inlet 1005, a bottom channel 1006, a seed dropping port 1007, an airflow inlet 1008, a restraining surface 1009, a boss 1010, a convex corner 1011, a second airflow outlet 1012, a secondary chamber 1013, a fixing lug 1014, an arc boss 1015, a main chamber 1016, a seed clearing outlet 1017, and a seed dropping outlet 1018.

[0017] After the seed meter is installed, the chamber of the seed meter is divided into seed filling area, seed clearing area, seed throwing area and seed return area according to the rotation direction of the seed disc;

[0018] Along the rotational movement direction of the seeds, the starting point of the arc corresponding to the seed filling area is the bottom of the seed metering device, and the end point is the point corresponding to the top of the seed metering device and the head end of the seed clearing outlet 1017; the starting point of the arc corresponding to the seed return area is the point corresponding to the top of the seed metering device and the head end of the seed clearing outlet 1017, and the end point is the bottom of the seed metering device;

[0019] The seed return area includes a seed clearing area and a seed throwing area, wherein the starting point of the arc corresponding to the seed clearing area is the point corresponding to the top of the seed metering device and the beginning of the seed clearing outlet 1017, and the end point is the point corresponding to the end of the seed clearing outlet 1017; the starting point of the arc corresponding to the seed throwing area is the point corresponding to the top of the seed throwing outlet 1018, and the end point is the point corresponding to the end of the seed throwing outlet 1018;

[0020] The seed inlet 1001 of the front housing 10 is located in the upper left corner of the front housing 10; a seed inlet channel 1003 is provided on the left side of the front housing 10, below the seed inlet 1001, for seeds to enter the seed meter; an air flow inlet 1008 is located in the lower left corner of the front housing 10; a bottom channel 1006 and an inlet 1005 are located at the bottom of the front housing 10; seeds entering through the seed inlet channel 1003 and air entering through the air flow inlet 1008 sequentially pass through the bottom channel 1006 and the inlet 1005 into the seed meter chamber;

[0021] The front surface of the front housing is provided with a first air flow outlet 1002 for the gas in the seed meter chamber to flow out; the seed return channel 1004 on the left side of the front housing 10 is used to flow the seeds back to the bottom of the seed meter; the seed drop port 1007 is located at the bottom of the front housing 10;

[0022] The restraining surface 1009 is located on the front housing 10 and its main function is to restrain and guide the seeds to be filled into the hole plug 6;

[0023] The interior of the front housing 10 is divided into a secondary chamber 1013 and a main chamber 1016. The irregular boss 1010 at the center of the front housing 10 transforms the main chamber 1016 into a gradually changing annular chamber. The main chamber 1016 constrains the regular and orderly flow of seeds and airflow. The secondary chamber 1013 is used to return uncleaned seeds to the bottom of the seed meter. A convex corner 1011 is provided at the upper right corner of the boss 1010 to support seeds into the seed cleaning area.

[0024] The seed cleaning outlet 1017 is located in the upper left corner of the front housing 10 and is in the shape of an arc-shaped notch; the seed cleaning outlet 1017 can connect the seed cleaning area and the seed return area, so that the cleaned seeds enter the seed return area; the seed throwing outlet 1018 is located in the lower left corner of the front housing 10 and is in the shape of an arc-shaped notch; the seed throwing outlet 1018 can connect the seed throwing area and the seed throwing port 1007, so that the seeds are discharged from the seed metering device to achieve sowing;

[0025] A second air flow outlet 1012 is provided on the rear surface of the upper left corner of the front shell 10, which is used for the air flow to quickly flow out of the seed metering device, so that air flow is formed inside the seed metering device; when cleaning the seeds, the air flow pushes the seeds to obtain a higher speed and greater centrifugal force, assisting in cleaning the seeds.

[0026] The outer circumference of the rear shell 3 is provided with a circular hole 3001 and an arc groove 3002 for installing the front shell 10; the bottom of the front shell 10 is provided with an arc boss 1015, which is installed in the arc groove 3002 on the front surface of the rear shell 3; the bottom edge of the front shell 10 is provided with a fixing ear 1014, which is connected and assembled with the circular hole 3001 on the rear shell 3 by bolts.

[0027] The upper end and the lower end of the rear housing 3 are respectively provided with fixed mounting lugs 3003 , and the rear housing 3 is mounted on the frame of the seeding machine using bolts through the fixed mounting lugs 3003 .

[0028] The bottom of the hole plug 6 is provided with a trapezoidal opening 6001 for passing airflow. The airflow flows out from the trapezoidal opening 6001 and can push the seeds to move toward the bottom of the hole plug 6 to achieve auxiliary seed filling.

[0029] The trapezoidal opening 6001 at the bottom of the hole insert 6 has a width W of 2 mm, a length L of 13 mm, and an acute angle of 70°.

[0030] Compared with the prior art, the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds has the beneficial effects that:

[0031] 1. In order to improve the filling and cleaning performance, a centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds is provided. The front shell body is provided with a horizontal air inlet channel, and an airflow outlet is designed on the front shell body, so that the airflow flows regularly and orderly in the seed metering device chamber;

[0032] 2. The rear shell body, the seed metering disc and the hole insert are designed with openings, so that the airflow can flow out through the trapezoidal openings at the bottom of the hole insert, thereby driving the seeds to flow to the bottom of the hole insert, playing an auxiliary filling role, and effectively reducing the seed missing rate of the seed metering device;

[0033] 3. The airflow outlet is designed on the front shell body, so that the airflow can quickly flow out of the seed metering device, and a high-speed airflow is formed in the seed metering device. The high-speed airflow makes the seeds obtain higher speed to generate greater centrifugal force to separate from the hole insert, plays an auxiliary cleaning role, and effectively reduces the seed missing rate. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is an exploded view of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0035] Figure 2 It is a right sectional view of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0036] Figure 3 It is an assembly view of the rotating part of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0037] Figure 4 It is a schematic view of the rear shell body structure of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0038] Figure 5 It is a schematic view of the seed metering disc structure of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0039] Figure 6 It is a schematic view of the hole insert structure of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0040] Figure 7A is an isometric view of the front shell body of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0041] Figure 7B is a partial sectional view of the front shell body of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0042] Figure 8A is a rear view of the front shell body of the centrifugal corn high-speed precision seed metering device with airflow auxiliary filling and cleaning seeds of the present application;

[0043] FIG8B is a front sectional view of the centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing according to the present invention;

[0044] Figure 9 This is a partition diagram of the centrifugal corn high-speed precision seed metering device with airflow-assisted seed filling and clearing of the present invention.

[0045] The accompanying drawings are as follows:

[0046] 1. Shaft 2. First bearing

[0047] 3. Rear housing 3001, round hole

[0048] 3002, arc groove 3003, installation lug

[0049] 3004, arc-shaped slot 3005, center hole of rear shell

[0050] 4. Bearing 5. Seed disc

[0051] 5001, card slot 5002, card slot bottom opening

[0052] 5003, seed plate center hole 5004, stirring wheel installation hole

[0053] 6. Hole plug 6001, trapezoidal opening

[0054] 7. Agitator wheel 8. Gasket

[0055] 9. Screw 10. Front housing

[0056] 1001, seed inlet 1002, first air flow outlet

[0057] 1003, seeding channel 1004, seeding channel

[0058] 1005, the entrance of the seed meter chamber 1006, the bottom channel

[0059] 1007, seeding port 1008, air flow inlet

[0060] 1009, Constraint Surface 1010, Boss

[0061] 1011, convex corner 1012, second air flow outlet

[0062] 1013, secondary chamber 1014, fixed lug

[0063] 1015, arc boss 1016, main chamber

[0064] 1017. Seed Clearing Export 1018. Seeding Export DETAILED DESCRIPTION

[0065] The specific embodiments of the present application are further described below with reference to the drawings.

[0066] As shown in Figure 1 and Figure 2 , the airflow-assisted centrifugal corn high-speed precision seed-metering device includes a shaft 1, a first bearing 2, a rear housing 3, a second bearing 4, a seed-metering disc 5, a hole insert 6, an agitator wheel 7, a gasket 8, a screw 9, and a front housing 10.

[0067] As shown in Figure 4 , the rear housing 3 includes a circular hole 3001, an arc groove 3002, a fixed mounting lug 3003, an arc slot hole 3004, and a rear housing center hole 3005.

[0068] The outer periphery of the rear housing 3 is provided with the circular hole 3001 and the arc groove 3002 for mounting the front housing 10. The upper end and the lower end of the rear housing 3 are respectively provided with the fixed mounting lug 3003, and the rear housing 3 is mounted on the frame of the seeding machine through the fixed mounting lug 3003 using a bolt. The center of the rear housing 3 is provided with the rear housing center hole 3005. The outer periphery of the rear housing 3 is provided with the arc slot hole 3004, which penetrates front and back, for passing airflow.

[0069] The first bearing 2 is mounted on the rear surface of the rear housing 3, and the second bearing 4 is mounted on the front surface of the rear housing 3.

[0070] The shaft 1 and the rear housing 3 are coaxially mounted and connected through the first bearing 2 and the second bearing 4. The first bearing 2, the second bearing 4, and the shaft 1 are mounted in the rear housing center hole 3005.

[0071] As shown in Figure 5 , the seed-metering disc 5 includes a clamping groove 5001, a bottom opening 5002, a seed-metering disc center hole 5003, and an agitator wheel mounting hole 5004.

[0072] The outer periphery of the seed-metering disc 5 is uniformly and symmetrically provided with four clamping grooves 5001. The bottom opening 5002 of the clamping groove 5001 is used for passing airflow. The center of the seed-metering disc 5 is provided with the seed-metering disc center hole 5003. The disc surface of the seed-metering disc 5 is provided with a pair of agitator wheel mounting holes 5004 for mounting the agitator wheel 7.

[0073] The seed-metering disc center hole 5003 on the seed-metering disc 5 is coaxially assembled with the shaft 1 and mounted on the front surface of the rear housing 3.

[0074] As shown in Figure 6 , four hole inserts 6 are respectively mounted in the four clamping grooves 5001 on the periphery of the seed-metering disc 5.

[0075] The bottom of the hole plug 6 is provided with a trapezoidal opening 6001 for passing airflow. The airflow flows out from the trapezoidal opening 6001 and can push the seeds to move toward the bottom of the hole plug 6 to achieve auxiliary seed filling.

[0076] Preferably, the trapezoidal opening 6001 at the bottom of the hole insert 6 has a width W of 2 mm, a length L of 13 mm, and an acute angle of 70°.

[0077] The stirring wheel 7 is coaxially assembled with the shaft 1 and is installed on the front surface of the seed disc 5 through the stirring wheel installation hole 5004.

[0078] The washer 8 and the screw 9 are located on the front surface of the stirring wheel 7 and are connected to the shaft 1. They can lock the axial movement of the rear housing 3, the seeding disc 5 and the stirring wheel 7, so that the seeding disc 5, the hole plug 6 and the stirring wheel 7 rotate with the shaft 1. Figure 3 shown.

[0079] As shown in Figures 7A, 7B, 8A and 8B, the front shell 10 includes a seed inlet 1001, a first air flow outlet 1002, a seed inlet channel 1003, a seed return channel 1004, an inlet 1005, a bottom channel 1006, a seed dropping port 1007, an air flow inlet 1008, a constraint surface 1009, a boss 1010, a convex corner 1011, a second air flow outlet 1012, a secondary chamber 1013, a fixing ear 1014, an arc boss 1015, a main chamber 1016, a seed cleaning outlet 1017 and a seed dropping outlet 1018.

[0080] The bottom of the front housing 10 is provided with an arc boss 1015, which is installed in the arc groove 3002 on the front surface of the rear housing 3. The bottom edge of the front housing 10 is provided with a fixing lug 1014, which is connected to the circular hole 3001 on the rear housing 3 by bolts. After the seed meter is installed, the seed meter chamber is divided into a seed filling area, a seed clearing area, a seed delivery area and a seed return area according to the rotation direction of the seed disc. Figure 9 shown.

[0081] Along the rotational direction of the seed, the starting point of the arc corresponding to the seed filling area is the bottom of the seed metering device, and the end point is the point corresponding to the top of the seed metering device and the head end of the seed clearing outlet 1017. The starting point of the arc corresponding to the seed return area is the point corresponding to the top of the seed metering device and the head end of the seed clearing outlet 1017, and the end point is the bottom of the seed metering device.

[0082] The seed return area includes a seed clearing area and a seed dropping area, wherein the starting point of the arc corresponding to the seed clearing area is the point at the top of the seed metering device corresponding to the beginning of the seed clearing outlet 1017, and the end point is the point corresponding to the end of the seed clearing outlet 1017. The starting point of the arc corresponding to the seed dropping area is the point corresponding to the top of the seed dropping outlet 1018, and the end point is the point corresponding to the end of the seed dropping outlet 1018.

[0083] The seed inlet 1001 of the front shell 10 is located at the upper left corner of the front shell 10. The seed inlet channel 1003 is located at the lower left side of the front shell 10 and below the seed inlet 1001, which is used for the seed to enter the seed metering device. The air inlet 1008 is located at the lower left corner of the front shell 10. The bottom channel 1006 and the inlet 1005 are located at the bottom of the front shell 10. The seed entering from the seed inlet channel 1003 and the air entering from the air inlet 1008 enter the seed metering device chamber through the bottom channel 1006 and the inlet 1005 in sequence.

[0084] The front surface of the front shell is provided with the first air outlet 1002 for the air in the seed metering device chamber to flow out. The seed return channel 1004 is located at the left side of the front shell 10, which is used for the seed to flow back to the bottom of the seed metering device. The seed dropping port 1007 is located at the bottom of the front shell 10.

[0085] The constraint surface 1009 is located on the front shell 10, which mainly functions to constrain and guide the seed to fill into the hole insert 6.

[0086] The inside of the front shell 10 is divided into a secondary chamber 1013 and a main chamber 1016. The irregular boss 1010 at the center of the inside of the front shell 10 makes the main chamber 1016 a gradually changing annular chamber. The main chamber 1016 constrains the orderly flow of the seed and the air. The secondary chamber 1013 is used for the seed that has not been cleaned to flow back to the bottom of the seed metering device. The convex corner 1011 at the upper right corner of the boss 1010 is used to support the seed to enter the seed cleaning area.

[0087] The seed cleaning outlet 1017 is located at the upper left corner of the inside of the front shell 10, which is in the shape of a circular arc notch. The seed cleaning outlet 1017 can connect the seed cleaning area and the seed return area, so that the cleaned seed enters the seed return area. The seed dropping outlet 1018 is located at the lower left corner of the inside of the front shell 10, which is in the shape of a circular arc notch. The seed dropping outlet 1018 can connect the seed dropping area and the seed dropping port 1007, so that the seed is discharged from the seed metering device to achieve seeding.

[0088] The second air outlet 1012 is located on the upper left corner of the rear surface of the front shell 10, which is used for the air to quickly flow out of the seed metering device, so that the air flow is formed in the seed metering device. The air flow pushes the seed to obtain higher speed and greater centrifugal force, which assists the seed cleaning.

[0089] The working process of the present application is as follows:

[0090] The air flow assisted centrifugal high-speed precision corn seed metering device is driven by a motor. The shaft 1 is connected with the motor output shaft through a shaft coupling, and then the shaft 1 rotates with the seed metering disc 5, the hole insert 6 and the stirring wheel 7. During operation, the seed metering device can be divided into a seed filling area, a seed cleaning area, a seed dropping area and a seed return area according to the seeding process, as shown in Figure 9The seeds enter the bottom channel 1006 through the seed inlet 1001 and the seed channel 1003 by their own gravity. The high-speed airflow enters the bottom channel 1006 from the airflow inlet 1008, and then blows the seeds in the bottom channel 1006 together into the bottom of the seed metering chamber through the inlet 1005. The seeds in the bottom of the chamber make high-speed circumferential motion in the main chamber 1016 by the agitation of the agitation wheel 7 and the hole insert 6. The agitation wheel 7 and the hole insert 6 agitate the seeds while capturing part of the seeds. When the captured seeds enter the filling area, the seeds are filled into the holes under the joint action of the centrifugal force generated by the high-speed circumferential motion and the constraint surface 1009. The small part of the airflow entering the main chamber 1016 flows out of the seed metering chamber through the trapezoidal opening 6001, the slot bottom opening 5002 and the arc slot hole 3004 in turn, pushes the seeds to move towards the bottom of the hole insert 6, and realizes the function of airflow-assisted filling. The remaining seeds that are not captured can better make circumferential motion in the seed metering chamber under the pushing of the airflow. When the seeds in the hole insert 6 enter the cleaning area, most of the seeds make centrifugal motion and are cleaned out of the hole insert 6 after losing the constraint of the constraint surface 1009, leaving only one seed. The remaining seeds that make circumferential motion enter the cleaning area and will make centrifugal motion after losing the constraint of the constraint surface 1009. The airflow entering the cleaning area will flow out of the seed metering chamber through the second airflow outlet 1012, forming a high-speed flowing airflow. The high-speed flowing airflow pushes the seeds in the cleaning area to move at a higher speed and separate from the seed metering disc, realizing the function of airflow-assisted cleaning. The seeds that are not cleaned in time can return to the bottom of the seed metering chamber through the secondary chamber 1013. The cleaned seeds flow back to the bottom of the seed metering chamber through the seed return channel 1004. The seeds returning to the bottom of the seed metering chamber make circumferential motion again under the agitation of the airflow, the agitation wheel 7 and the hole insert 6, and perform filling, cleaning and returning, and circulate repeatedly to finally form a seed flow. Only one seed is left in the hole insert 6 after passing through the cleaning area. When the seeds reach the planting area, the seeds separate from the hole insert 6 under the action of the centrifugal force to perform planting, and are discharged from the planting port 1007, finally completing the entire planting process and realizing high-speed precision planting.

Claims

1. A centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing, characterized by: The centrifugal corn high-speed precision seeding device comprises a shaft (1), a first bearing (2), a rear housing (3), a second bearing (4), a seeding disc (5), a hole plug (6), an agitating wheel (7), a gasket (8), a screw (9) and a front housing (10); The rear shell (3) comprises a circular hole (3001), an arc groove (3002), a fixed installation lug (3003), an arc-shaped slot hole (3004) and a rear shell center hole (3005); A rear shell center hole (3005) is provided at the center of the rear shell (3); an arc-shaped slot hole (3004) is provided on the outer circumference of the rear shell (3), and the arc-shaped slot hole (3004) penetrates from front to back and is used for passing airflow; The first bearing (2) is mounted on the rear surface of the rear housing (3), and the second bearing (4) is mounted on the front surface of the rear housing (3); The shaft (1) and the rear housing (3) are coaxially mounted and connected via a first bearing (2) and a second bearing (4); the first bearing (2), the second bearing (4) and the shaft (1) are mounted in a center hole (3005) of the rear housing; The seeding disc (5) comprises a slot (5001), a bottom opening (5002), a central hole of the seeding disc (5003) and a stirring wheel mounting hole (5004); The outer circumference of the seeding disc (5) is evenly and symmetrically provided with four slots (5001); the bottom opening (5002) of the slots (5001) is used for passing airflow; a seeding disc center hole (5003) is provided at the center of the seeding disc (5); a pair of stirring wheel mounting holes (5004) are provided on the disc surface of the seeding disc (5) for mounting the stirring wheel (7); The center hole (5003) of the seeding disc (5) is coaxially assembled with the shaft (1) and is installed on the front surface of the rear housing (3); The four hole plug-ins (6) are respectively installed in the four card slots (5001) on the edges of the seeding plate (5); The stirring wheel (7) is coaxially assembled with the shaft (1) and is mounted on the front surface of the seeding disc (5) through the stirring wheel mounting hole (5004); The gasket (8) and the screw (9) are located on the front surface of the stirring wheel (7) and are connected to the shaft (1). They can lock the axial movement of the rear housing (3), the seeding disc (5) and the stirring wheel (7), so that the seeding disc (5), the hole plug (6) and the stirring wheel (7) rotate along with the shaft (1); The front housing (10) includes a seed inlet (1001), a first airflow outlet (1002), a seed inlet channel (1003), a seed return channel (1004), an inlet (1005), a bottom channel (1006), a seed delivery port (1007), an airflow inlet (1008), a restraining surface (1009), a boss (1010), a convex corner (1011), a second airflow outlet (1012), a secondary chamber (1013), a fixing lug (1014), an arc boss (1015), a main chamber (1016), a seed clearing outlet (1017) and a seed delivery outlet (1018); After the seed meter is installed, the chamber of the seed meter is divided into seed filling area, seed clearing area, seed throwing area and seed return area according to the rotation direction of the seed disc; Along the rotational movement direction of the seeds, the starting point of the circular arc corresponding to the seed filling area is the bottom of the seed metering device, and the end point is the point corresponding to the top of the seed metering device and the head end of the seed clearing outlet (1017); the starting point of the circular arc corresponding to the seed return area is the point corresponding to the top of the seed metering device and the head end of the seed clearing outlet (1017), and the end point is the bottom of the seed metering device; The seed return area includes a seed clearing area and a seed throwing area, wherein the starting point of the circular arc corresponding to the seed clearing area is the point corresponding to the top of the seed metering device and the beginning of the seed clearing outlet (1017), and the end point is the point corresponding to the end of the seed clearing outlet (1017); the starting point of the circular arc corresponding to the seed throwing area is the point corresponding to the top of the seed throwing outlet (1018), and the end point is the point corresponding to the end of the seed throwing outlet (1018); The seed inlet (1001) of the front shell (10) is located at the upper left corner of the front shell (10); a seed inlet channel (1003) is provided on the left side of the front shell (10) and below the seed inlet (1001) for allowing seeds to enter the seed meter; an air flow inlet (1008) is located at the lower left corner of the front shell (10); a bottom channel (1006) and an inlet (1005) are located at the bottom of the front shell (10); seeds entering through the seed inlet channel (1003) and air flow entering through the air flow inlet (1008) sequentially pass through the bottom channel (1006) and the inlet (1005) and enter the seed meter chamber; A first air flow outlet (1002) is provided on the front surface of the front shell for the gas in the seed meter chamber to flow out; a seed return channel (1004) on the left side of the front shell (10) is used for the seeds to flow back to the bottom of the seed meter; a seeding port (1007) is located at the bottom of the front shell (10); The restraining surface (1009) is located on the front housing (10), and its main function is to restrain and guide the seeds to be filled into the hole plug (6); The interior of the front shell (10) is divided into a secondary chamber (1013) and a main chamber (1016); an irregular boss (1010) at the center of the front shell (10) makes the main chamber (1016) a gradually changing annular chamber; the main chamber (1016) constrains the regular and orderly flow of seeds and airflow; the secondary chamber (1013) is used to return uncleaned seeds to the bottom of the seed metering device; a convex corner (1011) is provided at the upper right corner of the boss (1010) for supporting seeds to enter the seed cleaning area; The seed cleaning outlet (1017) is located at the upper left corner of the front housing (10) and is in the shape of an arc-shaped notch; the seed cleaning outlet (1017) can connect the seed cleaning area and the seed return area, allowing the cleaned seeds to enter the seed return area; the seed dropping outlet (1018) is located at the lower left corner of the front housing (10) and is in the shape of an arc-shaped notch; the seed dropping outlet (1018) can connect the seed dropping area and the seed dropping port (1007), allowing the seeds to be discharged from the seed metering device to achieve sowing; A second airflow outlet (1012) is provided on the rear surface of the upper left corner of the front shell (10), which is used for the airflow to quickly flow out of the seed metering device, so that airflow is formed inside the seed metering device; when cleaning the seeds, the airflow pushes the seeds to obtain a higher speed and greater centrifugal force, assisting in cleaning the seeds.

2. The centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing according to claim 1, characterized in that: The outer circumference of the rear shell (3) is provided with a circular hole (3001) and a circular arc groove (3002) for installing the front shell (10); the bottom of the front shell (10) is provided with an arc boss (1015), and the arc boss (1015) is installed in the circular arc groove (3002) on the front surface of the rear shell (3); the bottom edge of the front shell (10) is provided with a fixing lug (1014), and the fixing lug (1014) is connected and assembled with the circular hole (3001) on the rear shell (3) by means of bolts.

3. The centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing according to claim 1, characterized in that: The upper end and the lower end of the rear housing (3) are respectively provided with fixed mounting lugs (3003), and the rear housing (3) is mounted on the frame of the seeding machine using bolts via the fixed mounting lugs (3003).

4. The centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing according to claim 1, characterized in that: The bottom of the hole plug (6) is provided with a trapezoidal opening (6001) for passing airflow. The airflow flows out from the trapezoidal opening (6001) and can push the seeds to move toward the bottom of the hole plug (6), thereby achieving auxiliary seed filling.

5. The centrifugal high-speed precision seed metering device for corn with airflow-assisted seed filling and clearing according to claim 4, characterized in that: The trapezoidal opening (6001) at the bottom of the hole insert (6) has a width W of 2 mm, a length L of 13 mm, and an acute angle of 70°.

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