A large-grain seed pneumatic seed metering device and method

Abstract

This invention provides a large-seed airflow seeding device and method, relating to the field of seeding equipment. Addressing the problem of current seeding equipment being unsuitable for large seeds and prone to clogging, this invention arranges a seed-cleaning groove wheel and a pressurizing conduit at the connection point between the seed-air mixing chamber and the outlet conduit. The rotation of the seed-cleaning groove wheel, under the combined action of the entrained airflow and the auxiliary airflow output from the pressurizing conduit, promotes the discharge from the seed-air mixing chamber. A negative pressure is created at the outlet conduit's outlet end, increasing the pressure difference between the entrained airflow and the outlet conduit inlet, thus improving the smoothness of large-seed seed discharging. The auxiliary airflow from the pressurizing conduit disturbs the seed-cleaning groove wheel, thereby loosening any blockages and clearing the blockages.

Description

Technical Field

[0001] This invention relates to the field of seeding equipment, and specifically to a large-grain seed airflow seeding device and method. Background Technology

[0002] In large-scale seeding equipment, some devices employ finger-clamp, spoon-wheel, pneumatic, and air-blowing seed metering devices to control seed dispensing and improve sowing precision. Furthermore, modern seeding equipment is increasingly designed with efficiency in mind. For example, some devices use brush-type and conveyor belt seed guiding devices, which can improve sowing speed and efficiency. Unlike small-grained seeds such as wheat, rice, and sorghum, large-grained seeds such as corn, soybeans, and cotton are more prone to clogging during transport within the seeding equipment. This is mainly because the shape and size of large seeds are more easily obstructed during transport, leading to blockages.

[0003] Some sowing equipment employs a finger-operated synchronous belt seed delivery mechanism. This mechanism allows for precise control of the seed's trajectory from discharge from the seed metering device to its entry into the seed furrow, avoiding particle size deviation caused by collisions during transport and improving the uniformity of particle size in high-speed sowing. Chinese Patent (Publication No.: CN113226011A) discloses an air-entraining device that uses airflow to entrain seeds and move them into one or more row units. The entrainer includes one or more outlets, which can be adjusted according to the seed requirements of the sowing machine. The airflow in the entrainer carries the seeds out. However, this method is only suitable for small seeds. Large seeds are prone to clogging during transport. Although a cleaning port can be used for transport, stopping the machine during operation to clear blockages is insufficient to meet the efficiency requirements of sowing operations. While intermittent airflow can resolve some blockages, for situations where residual seeds block the seed metering path after a shutdown and restart, intermittent airflow may cause pressure on the blockage, exacerbating the jamming and making it difficult to achieve a good clearing effect. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies of existing technologies by providing a large-grain seed airflow discharge device and method. This involves arranging a seed-cleaning groove wheel and a pressurizing conduit at the connection point between the seed-gas mixing chamber and the outlet conduit. The rotation of the seed-cleaning groove wheel, under the combined action of the entrained airflow and the auxiliary airflow output from the pressurizing conduit, promotes the discharge of seeds from the seed-gas mixing chamber. A negative pressure is created at the outlet conduit's outlet end, increasing the pressure difference between the entrained airflow and the outlet conduit's inlet, thus improving the smoothness of large-grain seed discharge. The auxiliary airflow from the pressurizing conduit agitates the seed-cleaning groove wheel, thereby loosening any blockages and clearing the blockages.

[0005] The first objective of this invention is to provide a large-grain seed airflow extrusion device, which employs the following solution:

[0006] include:

[0007] The seed dispensing assembly includes multiple entraining mechanisms. Inside each entraining mechanism, a main airflow duct, a seed chamber, and a seed-gas mixing chamber are arranged sequentially. The seed chamber has a seed inlet at the top and a seed-gas mixing chamber on one side of its bottom. The main airflow duct is connected to the bottom of the seed-gas mixing chamber through an air inlet channel. A seed dispensing port connected to an outlet duct is formed on one side of the top of the seed-gas mixing chamber.

[0008] The unblocking component includes a pressurizing conduit and a seed cleaning groove wheel that is rotatably mounted on the top of the seed-gas mixing chamber. The seed cleaning groove wheel has a groove for holding seeds on its outer circumference. The pressurizing conduit is connected to the main airflow pipe and the seed discharge port. The pressurizing conduit has an auxiliary hole facing the seed cleaning groove wheel.

[0009] Furthermore, the bottom of the seed gas mixing chamber is provided with a breathable bottom plate, which partially blocks the air intake channel connecting one end of the seed gas mixing chamber.

[0010] Furthermore, the inner wall of the air intake channel is provided with a seed discharge hole, which is fitted with a seed discharge box cover.

[0011] Furthermore, the seed cleaning wheel is mounted on the wall of the seed-gas mixing chamber via a wheel axle. The seed cleaning wheel is disturbed by the entrained airflow passing through the seed-gas mixing chamber and the auxiliary airflow output from the auxiliary hole, causing it to rotate passively and adjust the position of the trough.

[0012] Furthermore, the seed cleaning groove wheel is also connected to a seed cleaning drive element, which is used to drive the seed cleaning groove wheel to rotate in order to adjust the position of the groove body.

[0013] Furthermore, a partition is provided between the seed chamber and the seed-gas mixing chamber, and one side of the bottom of the seed chamber bypasses the partition to connect to the seed-gas mixing chamber.

[0014] Furthermore, the pressurizing conduit extends from the seed chamber and the partition to the seed outlet, and auxiliary holes are provided on the segmental sidewall of the pressurizing conduit in the seed-gas mixing chamber.

[0015] Furthermore, the multiple entrainment mechanisms are arranged sequentially, and the main airflow pipes of adjacent entrainment mechanisms are connected in series and then connected to the air source.

[0016] A second objective of this invention is to provide a method for operating the large-grain seed airflow metering device as described in the first objective, comprising:

[0017] The main airflow pipe is connected to the air source. The airflow is blown into the seed-gas mixing chamber from below through the air inlet channel. After the seeds fall into the seed chamber through the seed inlet, they enter the seed-gas mixing chamber and are carried by the airflow, moving towards the seed outlet.

[0018] Airflow enters the seed discharge port through the pressurization duct, creating a negative pressure at the inlet end of the outlet duct, and the airflow output from the auxiliary hole acts on the seed cleaning trough wheel;

[0019] The airflow carrying the seeds and the airflow output from the auxiliary hole drive the seed cleaning groove wheel to rotate. The seeds entering the groove of the seed cleaning groove wheel are driven and rotated to face the seed discharge port. Under the negative pressure of the airflow, they enter the outlet guide tube through the seed discharge port for discharge.

[0020] Furthermore, when the seed outlet becomes blocked, the airflow from the auxiliary hole blows the seed cleaning wheel, which shakes to disturb the seeds at the blockage location, loosening the blockage. Combined with the negative pressure formed by the pressurization conduit at the inlet of the outlet conduit, the loosened seeds are discharged, thus clearing the blockage.

[0021] Compared with the prior art, the advantages and positive effects of this invention are:

[0022] (1) To address the problem that current seed metering equipment is not adapted to large seeds and is prone to blockage, a seed cleaning groove wheel and a pressurizing duct are arranged at the connection between the seed gas mixing chamber and the outlet duct. The rotation of the seed cleaning groove wheel under the combined action of the entrained airflow and the auxiliary airflow output from the pressurizing duct promotes the discharge of seeds from the seed gas mixing chamber. The outlet end of the pressurizing duct is connected to the outlet duct to form a negative pressure, which increases the pressure difference between the entrained airflow and the inlet of the outlet duct, thereby improving the smoothness of seed metering for large seeds. The auxiliary airflow of the pressurizing duct disturbs the seed cleaning groove wheel, thereby disturbing the blockage and loosening it, thus clearing the blockage.

[0023] (2) The use of a pressurized conduit can, on the one hand, increase the airflow speed in the outlet conduit during normal seed discharge, improve seed discharge efficiency, and reduce the problem of seeds getting stuck in the outlet conduit; on the other hand, it can increase the negative pressure at the location where the outlet conduit connects to the seed-gas mixing chamber, receive the seeds transported by the seed cleaning wheel and achieve suction, thus clearing the blockage in the seed-gas mixing chamber, increasing the pressure difference between the air intake channel and the inlet of the outlet conduit, and ensuring smooth seed discharge.

[0024] (3) When passive seeding cannot meet the demand, the seed cleaning drive element can actively drive the seed cleaning groove wheel to rotate and discharge the seeds accumulated in the seed gas mixing chamber to the outlet pipe. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the large-grain seed airflow metering device and the large-grain seed sowing equipment in Embodiments 1 and 2 of the present invention.

[0027] Figure 2 This is a schematic diagram of the large-grain seed airflow metering device in Embodiments 1 and 2 of the present invention.

[0028] Figure 3 This is a top view schematic diagram of the large-grain seed airflow metering device in Embodiments 1 and 2 of the present invention.

[0029] Figure 4 This is a schematic diagram of the seeding component in Embodiments 1 and 2 of the present invention.

[0030] Figure 5 This is a schematic diagram of the seeding component and the blockage clearing component in Embodiments 1 and 2 of the present invention.

[0031] Figure 6 This is a schematic diagram of the breathable bottom plate in Embodiments 1 and 2 of the present invention.

[0032] Figure 7 This is a schematic diagram of the sealing cover plate in Embodiments 1 and 2 of the present invention.

[0033] Figure 8 This is a schematic diagram of the internal structure of the seeding component in Embodiments 1 and 2 of the present invention.

[0034] The components include: 1. Hopper, 2. Distribution plate, 3. Large-grain seed airflow metering device, 4. Airflow duct, 5. Fan, 6. Dispensing duct, 7. Meter, 8. Seed inlet assembly, 9. Input port, 10. Seed cleaning drive motor, 11. Metering assembly, 12. Outlet duct, 13. Sealing cover, 14. Main airflow inlet pipe, 15. Ventilated bottom plate, 16. Air inlet channel, 17. Main airflow duct, 18. Seed chamber, 19. Partition, 20. Seed-air mixing chamber, 21. Seed cleaning groove wheel, 22. Pressurization duct, 23. Seed unloading box cover, 24. Ventilated bottom plate mounting groove, 25. Seed inlet, 26. Seed dispensing port, and 27. Auxiliary hole. Detailed Implementation

[0035] Example 1

[0036] In a typical embodiment of the present invention, such as Figures 1-8 As shown, an airflow seeding device for large-grain seeds is presented.

[0037] like Figure 1As shown, the large-seed airflow seed metering device 3 is used in large-seed seed sowing equipment. The hopper 1 of the large-seed seed sowing equipment is connected to the large-seed airflow seed metering device 3 in this embodiment through the distribution plate 2, and seeds are put into the large-seed airflow seed metering device 3. The seeds output from the large-seed airflow seed metering device 3 are connected to the input port 9 of the seed metering device 7 through the delivery conduit 6. The seed metering device 7 has a seed inlet component 8 at the input port 9 to pick up the seeds delivered through the input port 9 and introduce them into the seed metering device 7. In addition, the fan 5 serves as the air source for the large-seed airflow seed metering device 3 and is connected to the large-seed airflow seed metering device 3 through the airflow conduit 4.

[0038] See Figure 2 The large-grain seed airflow dispensing device 3 mainly includes a dispensing component 11 and a blockage clearing component. The dispensing component 11 obtains seeds from the distribution plate 2, sorts out the large number of seeds falling into the hopper 1, and then discharges them to the delivery guide 6, and then achieves precise dispensing through the seed dispenser 7. The blockage clearing component can guide the seeds in the dispensing component 11, improve the smoothness of seed output, and form a near-flowing dispensing process. It can also clear blockages when a large number of seeds are put into the dispensing component 11, reducing downtime for blockage clearing during sowing.

[0039] The seed dispensing assembly 11 includes multiple entraining mechanisms. Inside each entraining mechanism are sequentially arranged main airflow ducts 17, seed chambers 18, and seed-gas mixing chambers 20. A partition 19 is provided between the seed chambers 18 and the seed-gas mixing chamber 20. One side of the bottom of the seed chamber 18 bypasses the partition 19 and connects to the seed-gas mixing chamber 20. Figure 2 As shown, multiple entrainment mechanisms are arranged sequentially, with the main airflow pipes 17 of adjacent entrainment mechanisms connected in series and then connected to the air source. In addition to the main airflow pipes 17, adjacent entrainment structures are separated, and the sides of the entrainment mechanisms at their ends are also equipped with sealing covers 13 to block and seal the sides of the entrainment structures. Figure 1 As shown, the main airflow duct 17 connected in series forms a main airflow inlet pipe 14 at its end, and is connected to the fan 5 through the airflow duct 4.

[0040] like Figure 4 , Figure 8 As shown, a seed inlet 25 is opened at the top of the seed chamber 18, which connects to the distribution plate 2 to receive seeds falling from the hopper 1. One side of the bottom of the seed chamber 18 is connected to the seed-gas mixing chamber 20, where the seeds are buffered and flow into the bottom of the seed-gas mixing chamber 20, where they are subjected to a carrying airflow that creates a carrying effect. The main airflow pipe 17 connects to the bottom of the seed-gas mixing chamber 20 through the air inlet channel 16. A seed discharge port 26 is formed on one side of the top of the seed-gas mixing chamber 20, connecting to the outlet conduit 12. The carrying airflow entrains the seeds and moves them upwards from the bottom of the seed-gas mixing chamber 20. Figure 5As shown, the seed flows to the seed outlet 26 and enters the outlet conduit 12, from where it is sent to the external delivery conduit 6.

[0041] like Figure 5 , Figure 8 As shown, the unblocking assembly includes a pressurizing conduit 22 and a seed cleaning groove wheel 21 rotatably mounted on the top of the seed-gas mixing chamber 20. The seed cleaning groove wheel 21 has a trough for holding seeds on its outer circumference. The pressurizing conduit 22 connects the main airflow pipe 17 and the seed discharge port 26. The pressurizing conduit 22 has an auxiliary hole 27 facing the seed cleaning groove wheel 21. The seed cleaning groove wheel 21 is mounted to the chamber wall of the seed-gas mixing chamber 20 via an axle. The seed cleaning groove wheel 21 is disturbed by the entrained airflow passing through the seed-gas mixing chamber 20 and the auxiliary airflow output from the auxiliary hole 27, causing it to passively rotate and adjust the position of the trough. The pressurizing conduit 22 extends to the seed discharge port 26 after passing through the seed chamber 18 and the partition 19.

[0042] To facilitate seed discharge from the seed-gas mixing chamber 20, a seed cleaning wheel 21 and a pressurizing conduit 22 are provided at the end of the seed-gas mixing chamber 20, where it connects to the outlet conduit 12, along the seed discharge direction. The seed cleaning wheel 21 has multiple grooves arranged circumferentially upwards. When rotating, these grooves rotate around the axis of the seed cleaning wheel 21. When seeds are contained in the grooves, the rotation of the seed cleaning wheel 21 causes the seeds to change position. The inlet end of the outlet conduit 12 is located on one side of the end of the seed-gas mixing chamber 20. The grooves of the seed cleaning wheel 21 transfer the seeds it carries to the inlet end facing the outlet conduit 12, where they are discharged under the pressure of the airflow.

[0043] During sowing, the process is intermittent. When the main airflow duct 17 stops supplying the seeds, some seeds remaining in the seed-gas mixing chamber 20 cannot rise to the outlet duct 12, causing them to remain on the ventilated bottom plate 15 within the seed-gas mixing chamber 20. When the process resumes, newly added seeds from the seed chamber 18 enter the seed-gas mixing chamber 20 and mix with the remaining seeds, increasing the seed quantity in the seed-gas mixing chamber 20. The airflow supplied by the main airflow duct 17 to the seed-gas mixing chamber 20 through the air inlet channel 16 and the ventilated bottom plate 15 is insufficient to meet the seed entrainment requirements at this time. In addition, the seed discharge process involves a change in direction, creating an angle at the location of the seed-gas mixing chamber 20 and the outlet duct 12, which makes it easy for seeds to accumulate in the seed-gas mixing chamber 20 and cause blockages.

[0044] In addition, if there are damaged seeds or soil particles mixed in in the seed chamber 18 when it is not in use, they will enter the airflow inlet through the permeable bottom plate under the action of gravity, affecting the airflow and causing blockage.

[0045] After the seed cleaning wheel 21 is installed, its rotation direction is consistent with the direction in which seeds flow from the seed-gas mixing chamber 20 to the outlet conduit 12. As the airflow carrying seeds enters the outlet conduit 12 from the seed-gas mixing chamber 20, it also drives the seed cleaning wheel 21 to rotate. Figure 5 As shown, the airflow carrying seeds flows from the vent plate 15 toward the outlet duct 12, thereby pushing the seed cleaning wheel 21 to rotate counterclockwise. The counterclockwise rotation of the seed cleaning wheel 21 can also carry the seeds in the trough below the axis of the seed cleaning wheel 21 to the right and discharge them from the position toward the outlet duct 12, promoting seed discharge and reducing the risk of blockage.

[0046] The pressurizing conduit 22 can output airflow at its end, increasing the speed of seeds entering the outlet conduit 12 from the seed-gas mixing chamber 20 and promoting seed discharge. At the same time, the pressurizing conduit 22 is also provided with an auxiliary hole 27, which can output airflow to act on the seed cleaning wheel 21, pushing the seed cleaning wheel 21 to rotate. The airflow output from the auxiliary hole 27 can act from the side of the seed cleaning wheel 21 away from the outlet conduit 12. Combined with the airflow carrying seeds in the seed-gas mixing chamber 20 to the outlet conduit 12, the seed cleaning wheel 21 can rotate in one direction, pushing the seeds in the seed-gas mixing chamber 20 to be discharged and reducing seed blockage in the seed-gas mixing chamber 20.

[0047] The first end of the pressurization conduit 22 is connected to the main airflow duct 17, drawing air from the main airflow duct 17 and delivering it to the outlet conduit 12. To meet the pressurization requirements, the flow velocity delivered from the end of the pressurization conduit 22 to the outlet conduit 12 must be increased and exceed the flow velocity of the airflow carrying seeds in the seed-air mixing chamber 20. This can be achieved by configuring the pressurization conduit 22 as a variable diameter conduit, with the cross-sectional area of ​​the channel gradually decreasing from the first end to the last end, thereby increasing the airflow velocity output from the last end of the pressurization conduit 22. Alternatively, other pressurization methods can be used, such as reducing the diameter of the last end of the pressurization conduit 22 to create a constricted structure to increase the airflow velocity and meet the pressurization requirements.

[0048] The auxiliary hole 27 is opened on the wall of the pressurizing conduit 22. The partition between adjacent grooves of the seed cleaning wheel 21 is blade-shaped. When the auxiliary airflow output from the auxiliary hole 27 acts on the seed cleaning wheel 21, it can push the blade-shaped partition, thereby driving the seed cleaning wheel 21 to rotate. The rotation direction of the seed cleaning wheel 21 driven by the airflow output from the auxiliary hole 27 is the same as the rotation direction of the seed cleaning wheel 21 driven by the entrained airflow output from the seed gas mixing chamber 20, thus jointly promoting the rotation of the seed cleaning wheel 21.

[0049] When the airflow output from the auxiliary hole 27 acts on the stuck seed cleaning wheel 21, it can disturb the seed cleaning wheel 21. Compared with the situation where the airflow is difficult to pass through the blocked seeds after blockage and triggers the seed cleaning wheel 21, the auxiliary hole 27 and the seed cleaning wheel 21 are both located at the end of the seed-gas mixing chamber 20. Therefore, the output airflow can still act on the seed cleaning wheel 21 when the seed-gas mixing chamber 20 is blocked, which promotes the seed cleaning wheel 21 to loosen the blocked seeds in the seed-gas mixing chamber 20 and helps to improve the anti-blocking ability of the seed cleaning wheel 21.

[0050] This embodiment also includes a seed cleaning drive element, such as... Figure 4 As shown, when passive seeding cannot meet the demand, the seed cleaning drive element can actively drive the seed cleaning groove wheel 21 to rotate, discharging the seeds accumulated in the seed-air mixing chamber 20 to the outlet conduit 12. The seed cleaning drive element can be a seed cleaning drive motor 10, the output shaft of which is connected to the axle of the seed cleaning groove wheel 21, thereby driving the seed cleaning groove wheel 21 to rotate actively. The seed cleaning drive motor 10 can be a servo motor, pneumatic motor, etc. When the seed cleaning drive motor 10 is not in operation, the seed cleaning groove wheel 21 can rotate under the action of airflow. When the seed cleaning drive motor 10 is in operation, it can drive the seed cleaning groove wheel 21 to rotate synchronously.

[0051] It should be noted that, because the seeds accumulated in the seed-gas mixing chamber 20 block the connection between the outlet conduit 12 and the seed-gas mixing chamber 20, the airflow supplied from the air inlet channel 16 through the permeable bottom plate 15 to the seed-gas mixing chamber 20 cannot flow smoothly to the outlet conduit 12. The airflow cannot form a carrying effect on the seeds in the seed-gas mixing chamber 20, and the airflow through the gaps between the accumulated seeds is small. The seeds near the outlet conduit 12 cannot get enough back pressure to break the jamming effect. At the same time, because the airflow cannot flow to the outlet conduit 12 due to the obstruction of the blocked seeds, it is difficult to form an effective negative pressure at the outlet conduit 12, and the seeds near the outlet conduit 12 are also difficult to be discharged, which aggravates the blockage problem.

[0052] In this embodiment, a pressurization conduit 22 is provided. The output airflow ensures that the end of the outlet conduit 12 connected to the seed-gas mixing chamber 20 is in a low-pressure region. After the seed cleaning wheel 21 moves the accumulated seeds to a position facing the outlet conduit 12, the seeds in the seed cleaning wheel 21 are drawn into the outlet conduit 12 under negative pressure. As the seed cleaning wheel 21 rotates, the groove of the seed cleaning wheel 21 continuously transfers the accumulated seeds from the accumulation position to a position close to the outlet conduit 12, and loosens the seeds accumulated at the positions of the outlet conduit 12 and the seed-gas mixing chamber 20, making it easier for the seeds to enter the outlet conduit 12 and be discharged.

[0053] Therefore, in this embodiment, a pressurized conduit 22 is used. On the one hand, it increases the airflow velocity in the outlet conduit 12 during normal seed dispensing, thereby improving seed dispensing efficiency and reducing seed jamming in the outlet conduit 12. On the other hand, it increases the negative pressure at the location where the outlet conduit 12 connects to the seed-gas mixing chamber 20, receives the seeds transported by the seed cleaning wheel 21 and achieves suction, thus clearing the blockage in the seed-gas mixing chamber 20, increasing the pressure difference between the air intake channel 16 and the inlet of the outlet conduit 12, and ensuring smooth seed dispensing.

[0054] Understandably, after the seed cleaning trough wheel 21 is set, during normal sowing, the seed cleaning trough wheel 21 is passively rotated under the action of the airflow carrying the seeds and the airflow of the auxiliary hole 27 of the pressurization duct 22, forming a guide for the seeds in the seed-gas mixing chamber 20, and assisting the seeds to enter the outlet duct 12 from the seed-gas mixing chamber 20 for discharge; when blockage occurs, the seed cleaning drive element actively drives the seed cleaning trough wheel 21 to rotate, so that the seed cleaning trough wheel 21 uses the trough to grab part of the seeds at the blockage position and transfer them to a position close to the outlet duct 12, and disturbs the blockage position to loosen the blockage position and facilitate the removal of the blockage.

[0055] Breathable base plate 15 Figure 6 As shown, a mesh plate with a mesh size smaller than the large seeds being transported is used. A permeable base plate 15 partially obstructs one end of the air intake channel 16, which connects to the seed-air mixing chamber 20. The permeable base plate 15 is connected to the main body of the encasing mechanism via a permeable base plate mounting groove 24, fixing its position. The inner wall of the air intake channel 16 has a seed discharge hole, which is fitted with a seed discharge box cover 23. If damaged seeds or mixed soil particles clog the permeable base plate 15, the seed discharge box cover 23 can be opened to clean the air intake channel 16.

[0056] By arranging a seed cleaning trough wheel 21 and a pressurizing duct 22 at the connection point between the seed-gas mixing chamber 20 and the outlet duct 12, the rotation of the seed cleaning trough wheel 21 under the combined action of the entrained airflow and the auxiliary airflow output from the pressurizing duct 22 promotes the discharge of seeds from the seed-gas mixing chamber 20. The outlet end of the pressurizing duct 22 is connected to the outlet duct 12 to form a negative pressure, which increases the pressure difference between the entrained airflow and the inlet of the outlet duct 12, improving the smoothness of seed discharge for large seeds. The auxiliary airflow of the pressurizing duct 22 disturbs the seed cleaning trough wheel 21, thereby disturbing the blockage position and loosening it, thus clearing the blockage.

[0057] Example 2

[0058] In another typical embodiment of the present invention, such as Figures 1-8 As shown, a working method of a large-grain seed airflow metering device 3 is given.

[0059] Using the large-grain seed airflow metering device 3 as described in Example 1, the following steps are included:

[0060] The main airflow pipe 17 is connected to the air source. The airflow is blown into the seed gas mixing chamber 20 from below through the air inlet channel 16. After the seeds fall into the seed chamber 18 through the seed inlet 25, they enter the seed gas mixing chamber 20 and are carried by the airflow, moving towards the seed outlet 26.

[0061] The airflow enters the seed discharge port 26 through the pressurizing conduit 22, and a negative pressure is formed at the inlet end of the outlet conduit 12. The airflow output from the auxiliary hole 27 acts on the seed cleaning trough wheel 21.

[0062] The airflow carrying the seeds and the airflow output from the auxiliary hole 27 drive the seed cleaning groove wheel 21 to rotate. The seeds entering the groove of the seed cleaning groove wheel 21 are driven and rotated to the position facing the seed discharge port 26. Under the action of negative airflow, they enter the outlet guide tube 12 through the seed discharge port 26 for discharge.

[0063] When the seed outlet 26 is blocked, the airflow output from the auxiliary hole 27 blows the seed cleaning wheel 21. The seed cleaning wheel 21 shakes to disturb the seeds at the blocked position, loosening the blockage. Combined with the negative pressure formed by the pressurizing conduit 22 at the inlet end of the outlet conduit 12, the loosened seeds are discharged, thus clearing the blockage.

[0064] The pressurized conduit 22 serves two purposes: firstly, it increases the airflow velocity within the outlet conduit 12 during normal seed dispensing, thereby improving dispensing efficiency and reducing seed jamming within the outlet conduit 12; secondly, it increases the negative pressure at the location where the outlet conduit 12 connects to the seed-gas mixing chamber 20, receiving and drawing in seeds transported by the seed cleaning wheel 21, thus clearing blockages within the seed-gas mixing chamber 20 and increasing the pressure difference between the air intake channel 16 and the inlet of the outlet conduit 12, ensuring smooth seed dispensing.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A large-grain seed airflow seeding device, characterized in that, include: The seed dispensing assembly includes multiple entraining mechanisms. Inside each entraining mechanism, a main airflow duct, a seed chamber, and a seed-gas mixing chamber are arranged sequentially. The seed chamber has a seed inlet at the top and a seed-gas mixing chamber on one side of its bottom. The main airflow duct is connected to the bottom of the seed-gas mixing chamber through an air inlet channel. A seed dispensing port connected to an outlet duct is formed on one side of the top of the seed-gas mixing chamber. The blockage relief assembly includes a pressurizing conduit and a seed cleaning trough wheel that is rotatably mounted on the top of the seed-gas mixing chamber. The seed cleaning trough wheel has a trough for holding seeds on its outer circumference. The pressurizing conduit is connected to the main airflow pipe and the seed discharge port. The pressurizing conduit has an auxiliary hole facing the seed cleaning trough wheel. The seed cleaning groove wheel is mounted on the wall of the seed-gas mixing chamber via a wheel axle. The seed cleaning groove wheel is disturbed by the entrained airflow passing through the seed-gas mixing chamber and the auxiliary airflow output from the auxiliary hole, causing it to rotate passively and adjust the position of the groove. The seed cleaning groove wheel is also connected to a seed cleaning drive element, which is used to drive the seed cleaning groove wheel to rotate in order to adjust the position of the groove. The pressurizing conduit extends from the seed chamber and partition to the seed outlet, increasing the negative pressure at the location where the outlet conduit connects to the seed-gas mixing chamber. An auxiliary hole is provided on the segmental sidewall of the pressurizing conduit within the seed-gas mixing chamber. The output airflow ensures that the end of the outlet conduit connecting to the seed-gas mixing chamber is in a low-pressure region. After the seed cleaning wheel moves the accumulated seeds towards the outlet conduit, the negative pressure draws the seeds from the seed cleaning wheel into the outlet conduit. As the seed cleaning wheel rotates, its groove continuously transfers the accumulated seeds from their accumulation position to a position close to the outlet conduit, loosening the seeds accumulated between the outlet conduit and the seed-gas mixing chamber, facilitating their entry into the outlet conduit and discharge.

2. The large-grain seed airflow seeding device as described in claim 1, characterized in that, The bottom of the seed gas mixing chamber is provided with a breathable bottom plate, which partially blocks the air intake channel connecting one end of the seed gas mixing chamber.

3. The large-grain seed airflow seeding device as described in claim 2, characterized in that, The inner wall of the air intake channel is provided with a seed discharge hole, which is fitted with a seed discharge box cover.

4. The large-grain seed airflow seeding device as described in claim 1, characterized in that, A partition is provided between the seed chamber and the seed-gas mixing chamber, and the bottom side of the seed chamber is connected to the seed-gas mixing chamber by bypassing the partition.

5. The large-grain seed airflow seeding device as described in claim 1, characterized in that, The multiple entrainment mechanisms are arranged sequentially, and the main airflow pipes of adjacent entrainment mechanisms are connected in series and then connected to the air source.

6. A method for operating the large-grain seed airflow metering device as described in any one of claims 1-5, characterized in that, include: The main airflow pipe is connected to the air source. The airflow is blown into the seed-gas mixing chamber from below through the air inlet channel. After the seeds fall into the seed chamber through the seed inlet, they enter the seed-gas mixing chamber and are carried by the airflow, moving towards the seed outlet. Airflow enters the seed discharge port through the pressurization conduit, creating a negative pressure at the inlet end of the outlet conduit, and the airflow output from the auxiliary hole acts on the seed cleaning trough wheel; The airflow carrying the seeds and the airflow output from the auxiliary hole drive the seed cleaning groove wheel to rotate. The seeds entering the groove of the seed cleaning groove wheel are driven and rotated to face the seed discharge port. Under the negative pressure of the airflow, they enter the outlet guide tube through the seed discharge port for discharge.

7. The working method of the large-grain seed airflow metering device as described in claim 6, characterized in that, When the seed outlet is blocked, the airflow from the auxiliary hole blows the seed cleaning wheel, which shakes to disturb the seeds at the blockage, loosening the blockage. Combined with the negative pressure formed by the pressurization conduit at the inlet of the outlet conduit, the loosened seeds are discharged, thus clearing the blockage.

Images