Air jet based soft soil layer breaking and excavation and backfill integrated operation device and method

Abstract

This invention belongs to the field of agricultural machinery technology, and particularly relates to an integrated operation device and method for breaking up, excavating, and backfilling soft soil layers based on air jetting. It includes a mobile main body, a seeding ejector system, a ditching system, and an air supply system mounted on a support platform of the mobile main body. The air supply system provides high-pressure gas to the ejector system and the ditching system. The seeding ejector system includes multiple sets of fertilizer tanks and seed bins, and ejectors connected to each fertilizer tank and seed bin via pipes. The ejectors are dual-channel ejectors, including a central airflow channel and peripheral seed-fertilizer channels, which converge at the ejector outlet to form a funnel-shaped outlet that first expands and then contracts. This invention integrates pneumatic ditching, jet seeding, and mechanical soil covering functions, enabling a single machine to complete the entire seeding process in one operation, effectively reducing the number of times machinery needs to enter the field, protecting soil structure, and improving overall operational efficiency.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery technology, and in particular relates to an integrated operation device and method for breaking up, excavating and backfilling soft soil layers based on air jets. Background Technology

[0002] The processes of trenching and covering soil before sowing are essentially localized micro-excavation and backfilling of the field. Currently, core aspects of field sowing operations, such as land preparation, sowing, and fertilization, generally employ a multi-step operation mode, where tillage is performed first, followed by trenching, sowing, fertilization, and covering. This multi-step operation significantly increases working time and energy consumption. Furthermore, the repeated compaction by machinery easily leads to soil consolidation, inhibiting crop growth and development, and greatly reducing yield. Therefore, there is an urgent need to develop new integrated sowing technologies to improve field sowing efficiency and quality. Furthermore, in the excavation and backfilling of soft soil layers in civil engineering and mining, similar problems arise, including complex procedures, numerous equipment, low efficiency, and significant soil disturbance. This can essentially be viewed as a macro-scale "sowing-fertilization" process, necessitating the development of integrated operation technologies.

[0003] Commonly used field sowing equipment is divided into mechanical seeders and pneumatic seeders. Traditional mechanical seeders have significant limitations: uneven seed output during sowing; their mechanical seed metering devices are prone to clogging and missed sowing when handling small-diameter, low-mechanical-strength seeds, causing physical damage and affecting sowing accuracy and uniformity; their furrowing method is prone to soil adhesion and clogging in moist soil, requiring a rotary tiller to pre-break the soil before the mechanical furrow opener, resulting in unstable furrow shapes and affecting subsequent sowing accuracy; furthermore, they cannot mix seeds and fertilizer, lacking seed-fertilizer mixed sowing functionality. For example, a wheat seeder with publication number "CN120712945A," although integrating ridging and sowing processes and achieving precise seed-fertilizer positioning, still relies on mechanical methods for sowing. The ridging and sowing components are prone to wear and adhesion due to soil contact, leading to a shortened machine lifespan and increased operating costs. Similarly, in the excavation of soft soil layers, traditional mechanical drilling tools or hydraulic hammers also have problems such as clay sticking, drill blockage, and hole wall instability, and lack efficient connection with the backfilling process.

[0004] Pneumatic seeders have a relatively complex structure, and components such as fans and pipes are prone to failure. The seed metering disc wears out quickly, resulting in high maintenance costs. During operation, the fan needs to run continuously, significantly increasing power consumption and energy costs. They also have poor adsorption stability for extremely small, light, or fragile seeds, easily leading to missed planting or damage. For example, CN120130204A discloses a pneumatic disc seeder with a wedge-shaped hole-opening device, which can reduce the seeding void rate during high-speed operation, but it still uses mechanical structures such as seed metering discs, resulting in high component wear and is only suitable for medium-sized seeds, limiting its application range. Regarding jet seeding, CN109287211A proposes a pneumatic acceleration jet seeding device for wheat, which accelerates wheat into the soil through a pneumatic mechanism and a seeding tube to achieve sowing. However, this device does not integrate sowing and fertilization functions, has low mechanical integration, and cannot be directly applied in practice. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated operation device and method for breaking up, excavating and backfilling soft soil layers based on air jets. The device has a more streamlined structure, less working resistance, and can simultaneously and efficiently achieve uniform mixing and precise application of fertilizer and seeds.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An integrated operation device for breaking up, excavating, and backfilling soft soil layers based on air jetting includes a mobile main body (which can be an existing tractor or large agricultural machinery). The mobile main body includes a support platform and wheels located on the left and right sides of the bottom of the support platform. Each wheel is independently driven by a permanent magnet synchronous motor. The support platform is also equipped with a driving system controlled by a driving control module. It also includes a seeding ejector system, a ditching system, and an air supply system set on the support platform of the mobile main body. The air supply system provides high-pressure gas to the ejector system and the ditching system. The seeding ejector system includes multiple sets of fertilizer tanks and seed bins, and ejectors connected to each fertilizer tank and seed bin through pipes. The ejectors are dual-channel ejectors, including a central airflow channel and an outer seed and fertilizer channel. The central airflow channel and the outer seed and fertilizer channel are connected and converge at the ejector outlet to form a funnel-shaped outlet that first expands and then contracts.

[0007] Furthermore, the outer seed-fertilizer channel is annular, and the outer seed-fertilizer channel is divided into two symmetrical semi-annular cavities by a partition. One semi-annular cavity is connected to the fertilizer tank through a fertilizer pipe, and the other semi-annular cavity is connected to the seed bin through a seed pipe.

[0008] Furthermore, the trenching system includes multiple supersonic nozzles arranged in parallel. These multiple supersonic nozzles can be arranged horizontally in parallel or obliquely in parallel. Each supersonic nozzle is arranged adjacent to the ejector and located in front of the ejector.

[0009] Furthermore, the gas supply system includes a gas storage tank and a pressurizing pump. The pressurizing pump pressurizes the gas in the gas storage tank to the operating pressure and distributes it to the ejector or supersonic nozzle through a distribution mechanism. The gas storage tank is equipped with two sets of high-pressure pipelines. One set of high-pressure pipelines is connected to the central airflow channel of the ejector and provides it with high-pressure gas. The other set of high-pressure pipelines is connected to the supersonic nozzle. Each set of high-pressure pipelines is equipped with a flow meter and a pressure gauge.

[0010] Furthermore, the front of the mobile main support platform is also equipped with a rotary tillage system. The rotary tillage system includes multiple sets of tillage blades, which are fixed to a through-type rotating shaft by interference fit. The two ends of the through-type rotating shaft are supported by high-load bearings and connected to the bottom of the support platform by high-strength clamping rods. A counterweight balance disc is fixed to its outer flange by high-strength bolts. The power of the rotary tillage system is provided by a three-phase asynchronous motor set on the support platform. The output shaft of the motor transmits torque to the rotating shaft of the rotary tillage system through a transmission system consisting of a transmission belt and a double-groove cast iron pulley.

[0011] Furthermore, it also includes a soil covering system, which includes multiple small rollers, each of which is fixedly installed at the bottom of the support platform via a connecting rod, and the small rollers are located behind the ejector.

[0012] Furthermore, each fertilizer tank and seed bin is equipped with an electromagnetic vibratory arch breaker at its discharge port. Each electromagnetic vibratory arch breaker is controlled by a control module. The arch breaker can ensure continuous material flow when the particles are relatively fine and the material is densely packed.

[0013] Another object of the present invention is to provide a working method using the above-described working device, comprising the following steps: S1. Start the three-phase asynchronous motor to drive the tillage blades to rotate and till the soil; S2. The driver operates the driving control module to move the moving body; S3. Start the high-pressure pipeline of the gas supply system to supply gas to the supersonic nozzle, breaking up the soil to form a wave-shaped precision planting furrow; S4. Start the dual-channel ejector and the high-pressure pipeline connected to its central airflow channel. The high-pressure gas forms a high-speed main jet and negative pressure in the ejector. After being drawn in and mixed with the seed fertilizer, it is decelerated by the expansion structure and accurately put into the seed furrow. S5. Due to the movement of the moving main body, each group of small rollers automatically rolls along the trench, evenly filling the surrounding loose soil and successfully completing the covering.

[0014] The advantages of this invention are: 1. This invention integrates pneumatic trenching, jet seeding, and mechanical soil covering functions, enabling a single machine to complete the entire seeding process in one go, effectively reducing the number of times the machine needs to enter the field, protecting the soil structure, and improving the overall efficiency of the operation; 2. This invention adopts an air jet non-contact trenching method, which can stabilize trenching and prevent clay blockage, adapt to various soil conditions, and ensure continuous operation and trench shape consistency. 3. This invention utilizes an ejector-type dual-channel structure to achieve uniform mixing and non-destructive delivery of seeds and fertilizers, improving sowing uniformity while avoiding mechanical damage and effectively solving the problems of missed sowing and uneven distribution; 4. The present invention adopts frictionless fluid transport and modular design, which is easy to maintain and equipped with multiple safety protections. It can adapt to complex farmland environments and support large-scale and efficient planting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the sowing and furrowing system in this invention.

[0017] Figure 3 This is a top view of the sowing and furrowing system in this invention.

[0018] Figure 4 This is a schematic diagram of the ejector structure of the present invention.

[0019] Figure 5 Velocity contour map inside the ejector.

[0020] Figure 6 This is a pressure cloud map inside the ejector. Detailed Implementation

[0021] like Figure 1-4As shown, an integrated operation device and method for breaking up, excavating, and backfilling soft soil layers based on air jets includes a fertilizer tank 1, a seed bin 2, a pipeline 3, a mobile body 4, an air storage tank 5 for providing high-pressure gas and a pressurizing pump 7, a drive motor 8, support wheels 12, an ejector 13 for mixed sowing and fertilization, a nozzle 14 for furrowing, a rotary tillage system 15 for tilling the soil, a support platform 17, a drive belt 18, a clamping rod 19 for mounting the rotary tillage system, and small rollers 21 for burying soil. The rotary tillage system 15 is rigidly connected to the bottom of the support platform via the high-strength clamping rod 19. Its core component includes multiple sets of tillage blades, which are fixed to a through-type rotating shaft by interference fit. The rotating shaft is supported at both ends by high-load bearings, and a counterweight balance disc 20 is fixed to the outer flange by high-strength bolts. The rotary tillage system is powered by a high-power three-phase asynchronous motor 8 installed on the support platform 17. The output shaft of the motor 8 transmits torque to the rotating shaft of the rotary tillage system 15 through a transmission system consisting of a transmission belt 18 and a double-groove cast iron pulley 16. The moving body 4 adopts an all-wheel drive architecture, with four high-pattern agricultural wheels 12 arranged in a rectangle, each independently driven by a permanent magnet synchronous motor built into the wheel. The high-pressure air supply system uses a pressure-resistant alloy air tank 5 as the air storage unit. The air tank 5 is connected to a pressure pump 7 through a pipeline. The pressure pump 7 pressurizes the air to generate high-pressure gas, which is displayed by a pressure gauge 6. The output end of the air tank 5 is connected to a flow control device 11 through a pressure regulating valve 10. When the air pressure is lower than the working threshold, the flow control device 11 automatically starts to maintain a stable output, and the compressed gas is transported to the distribution mechanism through the reinforced pipeline 3. The trenching operation is connected to the air supply terminal via pipe 3, which consists of six sets of supersonic nozzles 14 arranged in parallel. These nozzles can be arranged horizontally or at an angle, with the angled parallel arrangement yielding the best results. Adjacent nozzles operate without interfering with each other. Figure 3The supersonic nozzles 14 are connected to the main pipeline of the gas storage tank 5 via high-pressure rubber hoses, and are spatially staggered. When the high-pressure gas is ejected at the speed of sound, it breaks up soil particles to form seed furrows. The sowing and fertilization process uses ejectors 13 to deliver materials. Six sets of dual-channel ejectors 13 are spatially corresponding to and staggered with the nozzle array 14. Both the fertilizer tank 1 and the seed bin 2 adopt a conical funnel structure, with the inner wall treated with a nano-coating to reduce the coefficient of friction. An electromagnetic vibration arch breaker 9 is provided at the bottom to ensure continuous material flow. Each ejector 13 adopts a double-layer annular flow channel design, including a central airflow channel 23 and an outer seed-fertilizer channel. The central airflow channel and the outer seed-fertilizer channel are connected and merged at the ejector outlet to form a funnel-shaped outlet that first expands and then contracts. The central airflow channel 23 is directly connected to the high-pressure gas source to form a high-speed main jet. The outer seed-fertilizer channel is divided into a symmetrical left half-annular cavity 22 and a right half-annular cavity 24, which are connected to the fertilizer tank 1 and the seed bin 2, respectively. When the high-speed airflow passes through a specific area of ​​the ejector 13, a negative pressure zone is formed under the effect of hydrodynamics, allowing seed and fertilizer particles to enter the mixing channel at a controllable rate. After optimization by the expansion structure, the velocity gradient of the mixture flow is reduced, and it is finally released into the trench through the guide outlet. The soil covering operation is achieved through process linkage based on the spatial phase difference of the execution units. After the first set of supersonic nozzles 14 completes the trenching, the ejector unit 13 immediately follows and injects the mixture into the trench; after the injection operation is completed, the subsequent sets of small rollers 21 automatically roll along the trench trajectory, accurately filling the surrounding loose soil into the trench, smoothly completing the soil covering process, and ensuring that the seeds and fertilizers are tightly covered by the soil. Through the coordination of spatial positions, the trenching, sowing, and soil covering processes are seamlessly connected.

[0022] A method for operating an integrated device for breaking up, excavating, and backfilling soft soil layers based on air jets includes the following steps: (1) The rotary tillage system 15 is fixed to the equipment chassis by a high-strength clamping rod 19. Multiple sets of blades are mounted on a through-type rotating shaft. The shaft end has a high-load bearing and a counterweight balance disc 20 to ensure stability. The high-power three-phase asynchronous motor 8 on the support platform 17 is started and driven by the transmission belt 18 and the double-groove cast iron pulley 16 to rotate the blades and till the soil.

[0023] (2) The all-wheel drive mobile body 4 is operated by the driving control module. Each of the four rectangular high-tread tires has an independent permanent magnet synchronous motor to realize off-road movement in the field and precise heading control, ensuring that it travels along the preset route.

[0024] (3) Using the pressure-resistant alloy gas storage tank 5 as the gas storage unit, start the pressurization pump 7 to pressurize and store gas; when the gas pressure is lower than the threshold, the flow control device 11 automatically maintains a stable output, and the compressed gas is sent to the distribution mechanism through the reinforced pipeline 3.

[0025] (4) The distribution mechanism sends high-pressure gas to six sets of staggered supersonic nozzles 14. The gas is ejected at the speed of sound to form a high-kinetic-energy jet, which breaks the soil to form a wave-shaped precision planting furrow and enhances the stability of the furrow wall.

[0026] (5) After the trench is opened, the six sets of dual-channel ejectors 13 aligned with the nozzle are started; the seed fertilizer tank (conical funnel, nano-coating, electromagnetic arch breaking device 9) ensures the continuous falling of materials. High pressure gas forms a high-speed main jet and negative pressure in the ejector 13. After the seed fertilizer is sucked in and mixed, it is decelerated by the expansion structure and accurately put into the seed trench.

[0027] (6) After the first set of nozzles completes the trenching, the corresponding ejector 13 immediately injects the mixed fertilizer into the trench precisely; the subsequent sets of small rollers 21 automatically roll along the trench, evenly filling the surrounding loose soil, successfully completing the covering, and ensuring that the fertilizer is tightly covered by the soil.

[0028] (7) By precisely controlling the spatial offset between the nozzle 14 and the ejector 13, rotary tillage, ditching, seeding and fertilization and soil covering are seamlessly connected to form an assembly line operation.

[0029] Taking wheat sowing as an example, the operating parameters and material balance of the entire device are set as follows: First, the following calculations were performed on the working process of the ejector, a key component in this application: Figure 5-6 The following are fluent simulation diagrams of the velocity and pressure of the ejector, a key component of the device. Inlet 1 is the high-pressure gas channel, inlet 2 is the fertilizer channel, inlet 3 is the seed channel, and outlet is the material (i.e., the mixture of fertilizer and seeds) outlet.

[0030] The specific calculation process is as follows: The material entrainment mechanism of the ejector is dominated by the basic equations of gas dynamics. When the high-pressure gas flows through the central airflow channel 23, according to the law of conservation of mass and Bernoulli's equation: In the narrowing section (throat) of the flow channel, the gas flow velocity v Rapid increase leads to static pressure P The pressure difference decreases significantly, forming a low-pressure area. This pressure difference Δ P Acting on the annular cavity inlet, it drives the movement of seed / fertilizer particles, and its kinetic equation can be expressed as: The three terms on the right-hand side of the formula represent the pressure gradient force, gas viscous drag, and gravity, respectively. When the pressure gradient force dominates (which requires satisfying...), ... The material is continuously entrained into the main airflow.

[0031] For wheat seeds, assuming the grain diameter... dp =3mm, density of the mixture ρ p =500kg / m 3 ,but m p = ρ p ·6π d p 3 =500×6π(0.003) 3 ≈7.07×10 −6 kg. Pressure gradient ∇ P =Δ P / L Take Δ P =0.1MPa, circumferential seam length L =0.01m, then ∇ P =10 7 Pa / m. Viscous resistance β =6π μr p air viscosity μ =1.8×10 −5 Pa·s, particle radius r p =0.0015m, then β ≈6π×1.8×10 −5 ×0.0015≈5.09×10 −7 N·s / m. When the gas velocity v g =340m / s, particles initially at rest, pressure gradient force dominates entrainment, calculated pressure gradient force is approximately 10. 7 ×1.41×10 −8 =0.141N, much greater than gravity and drag (approximately 10). − 5 (N), which ensures that particles are entrained.

[0032] Flow control in annular cavities is based on the fundamental laws governing the motion of viscous fluids. For a width of... d Annular slit, volumetric flow rate Determined by the generalized Hagen-Poiseuille law: in K f For wall roughness correction factor (nano-coating makes) ε / d <10 −4 If the seeding density is set at 200 seeds / meter, the traveling speed is 1 m / s, and the average weight of 1000 seeds is 100 g / seed, then the required mass flow rate is... =200×0.1×10 -3 =0.02kg / s. Discharge port width. d =1mm, pressure difference Δ P =0.1MPa, μ =1.8×10 −5 Pa·s, L =0.01m, K f ≈1, then we can obtain ≈1.45×10 -4 m³ / s. Material density is taken as 500 kg / m³. 3 (For a mixture of seeds and fertilizer), the mass flow rate is... =1.45×10 −4 ×500≈0.0725kg / s, matching the required 0.02kg / s, with a margin for adjustment. In practice, the adjustable range of the discharge port width is set to 0.5-5mm to cover various seeds such as wheat.

[0033] The expression for the flow ratio when two cavities are connected in parallel is: Through symmetrical design The flow ratio then simplifies to: This cubic adjustment characteristic allows for wide-range flow control with micron-level width variations. When the circumferential gap width machining error is 0.01 mm, the flow rate change Δ R / R ≈3×(Δ d / d =3×(0.01 / 1)=3%, which meets the requirements for agricultural sowing precision (usually the error is <5%).

[0034] Based on Bernoulli's equation, the ejector inlet pressure P 0 Relationship with flow rate in γ =1.4, Ma =0.8, then the pressure ratio is about 1.5, which can ensure stable negative pressure.

[0035] The nozzles in each group are spaced 20cm apart, with an outlet diameter of 15mm, a height of 15cm from the ground, and a deflection angle of 15° (the angle between the nozzle and the direction of travel). The impact force originates from the dynamic pressure of the gas jet, based on fluid dynamics formulas. At this time, the air density ρ =1.2kg / m3, speed v =340m / s, nozzle exit area A ≈1.77×10 -4 m2 Efficiency coefficient η =0.8, thus the nozzle trenching impact force can be obtained. F ≈19.6N, this force is enough to break common farmland soil.

[0036] With a jet diffusion angle of 10°–15°, the impact diameter at the soil surface is approximately 3–5 cm, forming a trapezoidal trench. The trench is 5 cm deep, 5 cm wide at the top, and 3 cm wide at the bottom. The volume per meter of trench is then... V groove = A groove × ≈0.0033m 3 If the device's travel speed is set to 1 m / s, then the trenching volume per hour is 11.9 m³. 3 It can cover the needs of typical farmland and support continuous operation.

[0037] The cross-sectional area of ​​each branch pipeline is equal, and Δ is adjusted by a regulating valve. P If consistent, the flow rate deviation is less than 5%. Nozzle gas flow rate is based on outlet velocity and cross-sectional area. Q nozzle = A · v Nozzle outlet area A =1.77×10 -4 m 2 speed of sound v =340m / s, then Q nozzle =1.77×10 -4 ×340≈0.06m 3 / s. Total flow at this time. Q total =0.36m 3 / s, cylinder pressure P =0.5MPa, standard state gas storage capacity V tank = Q total · t · P atm / P =0.36×3600×0.1÷0.5≈259m 3 In practice, the volume of the gas tank can be reduced by pressurization, thus enabling continuous gas supply.

Claims

1. An integrated operation device for breaking up, excavating, and backfilling loose soil layers based on air jets, comprising a mobile main body, the mobile main body including a support platform, wheels located on the left and right sides of the bottom of the support platform, each wheel being independently driven by a permanent magnet synchronous motor, and a driving system also being provided on the support platform; characterized in that: It also includes a seeding ejector system, a furrowing system, and an air supply system mounted on the mobile main support platform; the air supply system provides high-pressure gas to the ejector system and the furrowing system; the seeding ejector system includes multiple sets of fertilizer tanks and seed bins, and ejectors connected to each fertilizer tank and seed bin via pipes; the ejector is a dual-channel ejector, including a central airflow channel and an outer seed-fertilizer channel, and the central airflow channel and the outer seed-fertilizer channel are connected and merged at the ejector outlet to form a funnel-shaped outlet that first expands and then contracts.

2. The integrated excavation and backfilling device for soft soil layers based on air jet as described in claim 1, characterized in that: The outer seed-fertilizer channel is ring-shaped and divided into two symmetrical semi-circular cavities by a partition. One semi-circular cavity is connected to the fertilizer tank through a fertilizer pipe, and the other semi-circular cavity is connected to the seed bin through a seed pipe.

3. The integrated operation device for breaking up, excavating, and backfilling soft soil layers based on air jets as described in claim 2, characterized in that: The trenching system includes multiple supersonic nozzles arranged in parallel. These nozzles can be arranged horizontally in parallel or obliquely in parallel. Each supersonic nozzle is located adjacent to and in front of the ejector.

4. The integrated operation device for breaking up, excavating, and backfilling soft soil layers based on air jets as described in claim 3, characterized in that: The gas supply system includes a gas storage tank and a pressurizing pump. The gas storage tank is equipped with two sets of high-pressure pipelines. One set of high-pressure pipelines is connected to the central airflow channel of the ejector and provides it with high-pressure gas. The other set of high-pressure pipelines is connected to the supersonic nozzle. Each set of high-pressure pipelines is equipped with a flow meter and a pressure gauge.

5. The integrated excavation and backfilling device for soft soil layers based on air jet as described in claim 4, characterized in that: The front of the mobile main support platform is also equipped with a rotary tillage system, which includes multiple sets of tillage blades. The tillage blades are fixed to the through-type rotating shaft by interference fit. Both ends of the through-type rotating shaft are supported by high-load bearings and connected to the bottom of the support platform by high-strength clamping rods. The outer flange is fixed with a counterweight balance disc by high-strength bolts. The power of the rotary tillage system is provided by a three-phase asynchronous motor set on the support platform.

6. The integrated operation device for breaking up, excavating, and backfilling loose soil layers based on air jet as described in claim 5, characterized in that: It also includes a soil covering system, which includes multiple small rollers, each of which is fixedly installed at the bottom of the support platform by a connecting rod, and the small rollers are located behind the ejector.

7. The integrated excavation and backfilling device for soft soil layers based on air jet as described in claim 6, characterized in that: Each fertilizer tank and seed bin is equipped with an electromagnetic vibration arch breaker at its discharge port, and each electromagnetic vibration arch breaker is controlled by a control module.

8. The integrated operation device for breaking up, excavating, and backfilling soft soil layers based on air jet as described in claim 7, characterized in that: The driving system is controlled by a driving control module.

9. The method of operating the working device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Start the three-phase asynchronous motor to drive the tillage blades to rotate and till the soil; S2. The driver operates the driving control module to move the moving body; S3. Start the high-pressure pipeline of the gas supply system to supply gas to the supersonic nozzle, breaking up the soil to form a wave-shaped precision planting furrow; S4. Activate the dual-channel ejector and the high-pressure pipeline connected to its central airflow channel. The high-pressure gas forms a high-speed main jet and negative pressure in the ejector. After being drawn in and mixed with the seed fertilizer, it is decelerated by the expansion structure and accurately injected into the seed furrow. S5. Due to the movement of the moving main body, each group of small rollers automatically rolls along the trench, evenly filling the surrounding loose soil and successfully completing the covering.

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