A seed flow secondary acceleration based air-assisted seed metering system

Abstract

This invention relates to the field of pneumatic seeding technology, specifically to a pneumatic seed metering system based on secondary acceleration of seed flow. The system includes a Venturi-type seed mixing device, a conveying pipe, a bend, a secondary seed flow accelerator, a corrugated pipe, and a distributor, arranged sequentially along the seed conveying direction. The Venturi-type seed mixing device and the conveying pipe are placed horizontally, while the secondary seed flow accelerator, corrugated pipe, and distributor are placed vertically. The secondary seed flow accelerator includes an acceleration section with a gradually decreasing cross-section along the seed conveying direction to increase the seed flow velocity. The inner wall of the corrugated pipe has multiple corrugated sections spaced apart. The distributor is used to evenly distribute seeds in all directions. This invention, with its secondary seed flow accelerator, corrugated pipe, and distributor, makes the seed metering system more uniform and smooth, meeting the requirements for high-volume, high-speed, and uniform seeding performance for different rice and wheat seeds. Furthermore, it has a simple structure, low installation requirements, and convenient maintenance, making it suitable for widespread application.

Description

Technical Field

[0001] This invention relates to the field of pneumatic seeding technology, and more specifically to a pneumatic seed metering system based on secondary acceleration of seed flow. Background Technology

[0002] Rice and wheat are important food crops. The existing seeding equipment is mainly single-purpose models, which have problems such as low operating efficiency, small seeding adjustment range and high idle rate.

[0003] The pneumatic seed metering device stably supplies seeds through a seed supply unit and is transported by a high-speed airflow. The seeds are then evenly distributed to each seed metering tube by a distributor. It features simple structure, strong versatility, and high seeding capacity, making it suitable for a wide variety of crops and meeting the requirements of high-speed operations. Therefore, researching high-speed, dual-purpose (rice and wheat) pneumatic seed metering machines is of great significance for meeting the needs of large-scale operations and improving operational efficiency.

[0004] In existing technologies, air-driven seed metering systems typically require bends to change the direction of seed flow due to the structure of the mechanical equipment arrangement. However, when the seed flow passes through the bend, it is affected by centrifugal force, and the seeds tend to accumulate on one side of the bend. This phenomenon is called the accumulation effect. This effect results in poor seed distribution uniformity, which in turn causes uneven seed discharge from the seed metering system. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the purpose of this invention is to provide a pneumatic seed metering system based on a secondary seed flow accelerator. The system incorporates a secondary seed flow accelerator and a corrugated pipe to solve the problem of uneven seed distribution caused by the accumulation effect of the bent pipe, which results in poor seed distribution uniformity.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pneumatic seed metering system based on secondary acceleration of seed flow includes a Venturi-type seed mixing device, a conveying pipe, a bend, a secondary seed flow accelerator, a corrugated pipe, and a distributor arranged sequentially along the seed conveying direction. The Venturi-type seed mixing device and the conveying pipe are placed horizontally, while the secondary seed flow accelerator, the corrugated pipe, and the distributor are placed vertically. The secondary seed flow accelerator includes an acceleration section with a gradually decreasing cross-section along the seed conveying direction, which is used to increase the seed flow velocity. The inner wall of the corrugated pipe is provided with multiple corrugated sections at intervals. The distributor is used to evenly distribute seeds in all directions.

[0008] Furthermore, the seed flow secondary accelerator includes an inlet section, an acceleration section, and an outlet section arranged sequentially along the seed transport direction. The cross-section of the acceleration section gradually decreases along the seed transport direction, the cross-sectional area of ​​the inlet section is equal to the maximum cross-sectional area of ​​the acceleration section, and the cross-sectional area of ​​the outlet section is equal to the minimum cross-sectional area of ​​the acceleration section.

[0009] Furthermore, the corrugated pipe also includes straight pipe sections, with multiple corrugated sections and multiple straight pipe sections arranged at even intervals.

[0010] Furthermore, the distributor includes a chassis, a top cover, and multiple branch pipes; the top cover has a downward-facing arc-shaped protrusion at its center, and an arc-shaped groove is arranged around the protrusion, with the groove facing downward, so that the radial cross-section of the top cover is "m"-shaped; the chassis has a connection port for connecting the bellows in the middle, and an arc-shaped protrusion is arranged around the connection port, with the protrusion facing upward; a cavity channel for seed dispensing is formed between the chassis and the top cover.

[0011] Furthermore, multiple arrow-shaped buckles are arranged periodically along the circumference of the upper edge of the chassis. The arrows of the buckles point to the center of the chassis. One end of the branch pipe is provided with a fastener corresponding to the arrow-shaped buckle. The branch pipe is installed in the channel formed between two adjacent arrow-shaped buckles through the fastener.

[0012] Furthermore, the Venturi-type mixing device includes an airflow duct assembly for introducing airflow and a seed inlet channel assembly for adding seeds, wherein the airflow duct assembly is placed horizontally and the seed inlet channel assembly is positioned above the airflow duct assembly; the airflow duct assembly includes an air inlet section, a mixing section and a diffusion section, wherein the seed inlet channel assembly is positioned above the mixing section and connected to the mixing section; the diffusion section is connected to the delivery pipe.

[0013] Furthermore, a seed discharge port is provided below the mixed seed section, and a cover plate is detachably installed at the seed discharge port.

[0014] Furthermore, the seed metering system also includes seed pipes, with branch pipes connected to the seed pipes in a one-to-one correspondence.

[0015] Furthermore, the bend is a quarter-circle bend.

[0016] Furthermore, the chassis and top cover are fixed together by bolts.

[0017] In summary, the present invention has the following advantages:

[0018] 1. This invention uses a seed flow secondary accelerator and a corrugated pipe to accelerate the seed flow as it passes through the secondary accelerator. Then, by passing through the corrugated pipe with its uneven internal structure, the collision frequency between the seeds and the corrugated pipe is increased, resulting in a more uniform seed distribution. This solves the problem of uneven seed distribution caused by the accumulation of seeds when the seed flow passes through the curved pipe section.

[0019] 2. The distributor in this invention, by designing a top cover and a base with special shapes, forms a seed dispensing cavity channel with a special shape between the top cover and the base, and the channel is arc-shaped, which makes the movement of the seed flow smoother.

[0020] 3. In this invention, the upper edge of the chassis is provided with a plurality of arrow-shaped buckles arranged periodically along the circumference. The arrows of the arrow-shaped buckles point to the center of the chassis, so that the channel formed between two arrow-shaped buckles becomes narrower, making it easier for seeds to enter and less likely to get stuck.

[0021] 4. This invention provides a seed discharge port below the mixed seed section, with a removable cover plate at the discharge port, which facilitates seed replacement and also makes it easy to clear and maintain the seed when it gets stuck.

[0022] 5. The distributor in this invention has a simple structure and is easy to install. When a fault occurs or the seed is stuck, it is convenient to replace and disassemble the parts for maintenance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a cross-sectional view of the present invention.

[0025] Figure 3 This is a cross-sectional view of the seed flow secondary accelerator of the present invention.

[0026] Figure 4 This is a cross-sectional view of the bellows of the present invention.

[0027] Figure 5 This is a diagram showing the separation of the dispenser of the present invention.

[0028] Figure 6 yes Figure 3 A magnified view of part a in the diagram.

[0029] Figure 7 This is a cross-sectional view of the top cover of the dispenser of the present invention.

[0030] Figure 8 This is a cross-sectional view of the Venturi hybridization device of the present invention.

[0031] Figure 9This is a schematic diagram of the Venturi hybridization device of the present invention.

[0032] in,

[0033] 1 is a Venturi-type hybrid seed device, 11 is an airflow duct assembly, 111 is an air inlet section, 112 is a hybrid seed section, 113 is a cover plate, 114 is a diffuser section, and 12 is a seed inlet duct assembly.

[0034] 2 is the delivery pipe;

[0035] 3 is a bend in the pipe;

[0036] 4 is the seed stream secondary accelerator, 41 is the inlet section, 42 is the acceleration section, and 43 is the outlet section;

[0037] 5 is a corrugated pipe, 51 is a corrugated section, and 52 is a straight pipe section;

[0038] 6 is the distributor, 61 is the chassis, 612 is the connection port, 613 is a protrusion, 62 is the top cover, 621 is an arc-shaped protrusion, 622 is a groove, 63 is an arrow-shaped buckle, 64 is a branch pipe, and 641 is a fastener.

[0039] 7 is the seeding tube. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1-9 As shown, a pneumatic seed metering system based on secondary acceleration of seed flow includes a Venturi-type seed mixing device, a conveying pipe, a bend, a secondary seed flow accelerator, a corrugated pipe, and a distributor arranged sequentially along the seed conveying direction. The Venturi-type seed mixing device and the conveying pipe are placed horizontally, while the secondary seed flow accelerator, the corrugated pipe, and the distributor are placed vertically. The secondary seed flow accelerator includes an acceleration section with a gradually decreasing cross-section along the seed conveying direction, which is used to increase the seed flow velocity. The inner wall of the corrugated pipe is provided with multiple corrugated sections at intervals. The distributor is used to evenly distribute seeds in all directions.

[0042] like Figure 3 As shown, the seed flow secondary accelerator includes an inlet section, an acceleration section, and an outlet section arranged sequentially along the seed conveying direction. The cross-section of the acceleration section gradually decreases along the seed conveying direction. The cross-sectional area of ​​the inlet section is equal to the maximum cross-sectional area of ​​the acceleration section, and the cross-sectional area of ​​the outlet section is equal to the minimum cross-sectional area of ​​the acceleration section.

[0043] like Figure 4 As shown, the corrugated pipe also includes straight pipe sections, and multiple corrugated sections and multiple straight pipe sections are arranged at even intervals.

[0044] Specifically, the cross-section of the acceleration section of the seed flow secondary accelerator gradually decreases along the seed transport direction. According to the governing equations of fluid mechanics, the flow velocity increases when the seed flow passes through the reduced cross-section acceleration section. When the accelerated seed flow passes through the corrugated pipe, the seeds in the seed flow collide with the uneven inner wall of the corrugated pipe. After acceleration, the collision frequency between the seeds and the inner wall of the corrugated pipe increases, resulting in a more uniform distribution of seeds. This solves the problem of uneven seed distribution in the seed flow caused by the accumulation effect when the seed flow passes through the bend.

[0045] like Figure 5-7 As shown, the distributor includes a chassis, a top cover, and multiple branch pipes. The top cover has a downward-facing arc-shaped protrusion at its center, surrounded by an arc-shaped groove facing downwards, giving the top cover an "m"-shaped radial cross-section. The chassis has a connection port in its center for connecting to the bellows, surrounded by an arc-shaped protrusion facing upwards. A cavity channel for seed dispensing is formed between the chassis and the top cover. Multiple arrow-shaped clips are periodically arranged circumferentially along the upper edge of the chassis, with the arrows pointing towards the center of the chassis. Each branch pipe has a corresponding fastener at one end, and the branch pipe is installed in the channel formed between two adjacent arrow-shaped clips using fasteners. The chassis and top cover are fixedly connected by bolts.

[0046] Specifically, a specially shaped cavity channel is formed between the base and the top cover. This cavity channel ascends and descends in an arc from the connection point to the channel itself, before reaching a straight section before entering the branch tube. This design ensures that the seed's movement trajectory is entirely arc-shaped, allowing for smoother seed movement within the dispenser. The straight section before entering the branch tube is formed by two adjacent arrow-shaped clips. The arrowheads of the clips point towards the center of the base, creating a channel that narrows from wide to narrow, similar to a funnel. This facilitates smooth seed entry into the branch tube, resulting in smooth seed dispensing and reducing seed jamming.

[0047] The distributor uses bolted connections to assemble the top cover and chassis, which is convenient for disassembly and assembly, easy to replace parts when they fail, and the parts are easy to process, reducing mass production costs.

[0048] like Figure 8-9 As shown, the Venturi-type seed mixing device includes an airflow duct assembly for introducing airflow and a seed inlet channel assembly for adding seeds. The airflow duct assembly is placed horizontally, and the seed inlet channel assembly is positioned above the airflow duct assembly. The airflow duct assembly includes an air inlet section, a seed mixing section, and a diffusion section. The seed inlet channel assembly is positioned above and connected to the seed mixing section. The diffusion section is connected to a delivery pipe. A seed discharge port is provided below the seed mixing section, and a cover plate is detachably installed at the seed discharge port.

[0049] Specifically, the Venturi-type hybrid seed device is existing technology. In this embodiment, a seed discharge port is provided at the bottom of the hybrid seed section, and a pull-out cover plate is provided at the seed discharge port. When the hybrid seed device needs to change seeds, or when seed jamming occurs, the cover plate can be pulled out to change seeds or clear the blockage.

[0050] In this embodiment, the delivery pipe is a flexible hose. The Venturi hybrid seed device, the delivery pipe, and the bend are fixedly connected by iron hoops. The bend is fixedly connected to the seed flow secondary accelerator and the seed flow secondary accelerator is fixedly connected to the corrugated pipe by flanges and bolts. The corrugated pipe is fixedly connected to the distributor by threads.

[0051] The working principle of this invention is as follows:

[0052] The Venturi-type seed mixing device connects the air inlet section to the positive pressure port of the blower. Seeds are placed into the seed inlet channel assembly. The seed flow sequentially passes through the Venturi-type seed mixing device, the conveying pipe, the bend, the seed flow secondary accelerator, the bellows, and the distributor. The Venturi-type seed mixing device accelerates the seed flow once. After passing through the conveying pipe, the bend changes the direction of the seed flow from horizontal to vertical. The seed flow is further accelerated by the seed flow secondary accelerator. The seed flow passes through the bellows, and the uneven inner wall of the bellows increases the number of collisions, making the seed distribution more uniform. After the seeds are evenly distributed, the seed flow enters the distributor, which achieves uniform seeding in all directions.

[0053] In summary, this invention addresses the seed accumulation phenomenon and uneven seed distribution that occurs when the seed stream passes through curved sections by incorporating a secondary seed flow accelerator and a corrugated pipe, thus achieving more uniform seed distribution. Furthermore, the use of a distributor with a specially shaped cavity channel further enhances the uniformity and smoothness of seed distribution. This invention can meet the requirements for high-volume, high-speed, and uniform sowing performance for various rice and wheat seeds. It also features a simple structure, low installation requirements, and convenient maintenance, making it suitable for widespread adoption.

[0054] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A pneumatic seed metering system based on secondary acceleration of seed flow, characterized by: The device includes a Venturi-type seed mixing device, a conveying pipe, a bend, a seed flow secondary accelerator, a corrugated pipe, and a distributor, arranged sequentially along the seed conveying direction. The Venturi-type seed mixing device and the conveying pipe are placed horizontally, while the seed flow secondary accelerator, the corrugated pipe, and the distributor are placed vertically. The seed flow secondary accelerator includes an acceleration section with a gradually decreasing cross-section along the seed conveying direction, which is used to increase the seed flow velocity. The inner wall of the corrugated pipe is provided with multiple corrugated sections at intervals. The distributor is used to evenly distribute seeds in all directions. The seed flow secondary accelerator includes a cylindrical inlet section, a frustum-shaped acceleration section, and a cylindrical outlet section arranged vertically in sequence along the seed conveying direction. The cross-section of the acceleration section gradually decreases along the seed conveying direction. The cross-sectional area of ​​the inlet section is equal to the maximum cross-sectional area of ​​the acceleration section, and the cross-sectional area of ​​the outlet section is equal to the minimum cross-sectional area of ​​the acceleration section. The distributor includes a chassis, a top cover, and multiple branch pipes. The top cover has a downward-facing arc-shaped protrusion at its center, and an arc-shaped groove is arranged around the protrusion, with the groove facing downwards, so that the radial cross-section of the top cover is "m"-shaped. The chassis has a connection port for connecting the bellows in the middle, and an arc-shaped protrusion is arranged around the connection port, with the protrusion facing upwards. A cavity channel for seed dispensing is formed between the chassis and the top cover.

2. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 1, characterized in that: The corrugated pipe also includes straight pipe sections, with multiple corrugated sections and multiple straight pipe sections arranged at even intervals.

3. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 1, characterized in that: The upper edge of the chassis is equipped with multiple arrow-shaped buckles arranged periodically along the circumference. The arrows of the buckles point to the center of the chassis. One end of the branch pipe is equipped with a fastener corresponding to the arrow-shaped buckle. The branch pipe is installed in the channel formed between two adjacent arrow-shaped buckles through the fastener.

4. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 1, characterized in that: The Venturi-type mixing device includes an airflow duct assembly for introducing airflow and a seed inlet channel assembly for adding seeds. The airflow duct assembly is placed horizontally, and the seed inlet channel assembly is positioned above the airflow duct assembly. The airflow duct assembly includes an air inlet section, a mixing section, and a diffusion section. The seed inlet channel assembly is positioned above and connected to the mixing section. The diffusion section is connected to a delivery pipe.

5. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 4, characterized in that: The mixed-seed section has a seed discharge port at the bottom, and a cover plate is detachably installed at the seed discharge port.

6. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 1, characterized in that: The seeding system also includes seeding pipes, with branch pipes connected to the seeding pipes in a one-to-one correspondence.

7. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 1, characterized in that: The bend is a quarter-circle bend.

8. The pneumatic seed metering system based on secondary acceleration of seed flow according to claim 1, characterized in that: The chassis and top cover are fixed together by bolts.

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