Self-propelled pneumatic seeding machine with function of deep application of layered fertilizer

Abstract

The application relates to the field of agricultural seeding technology, and discloses a self-propelled pneumatic seeding machine with a kind of seed and fertilizer layered deep application function, which comprises a vehicle frame, a fertilizer application mechanism is arranged on the vehicle frame, a furrowing mechanism is arranged on the vehicle frame, a supporting frame is fixedly connected to the upper surface of the vehicle frame, a pneumatic seed supply device is fixedly connected to the upper surface of the supporting frame, a docking frame is fixedly connected to the upper surface of the supporting frame, a seeding vehicle is fixedly connected to the rear end of the docking frame, the fertilizer application mechanism comprises a storage tank and a motor, and a discharge shaft is fixedly connected to the output end of the motor. The application adopts a structure in which the motor drives the discharge shaft and the stirring blades are synchronously linked, and the synchronous transmission of power is realized through a synchronous wheel and a synchronous belt. The fertilizer is continuously stirred while being quantitatively discharged, effectively solving the problem of uneven discharge caused by fertilizer caking, realizing accurate, stable and continuous conveying of the fertilizer, and improving the control precision of the fertilizer application amount.

Description

Technical Field

[0001] This invention relates to the field of agricultural sowing technology, specifically to a self-propelled pneumatic seeder with a layered deep application function for seeds and fertilizers. Background Technology

[0002] In agricultural production, sowing and fertilization are two core links that determine crop yield, quality, and overall agricultural benefits, directly impacting national food security and sustainable agricultural development. Currently, my country's agriculture is at a critical stage of transformation from traditional, scattered planting to large-scale, intensive, and mechanized modern agriculture. Large-scale, contiguous planting models place higher demands on the operational efficiency, precision, and intelligence of sowing and fertilization equipment. Traditional surface-broadcasting fertilization methods have extremely low fertilizer utilization rates. Large amounts of unabsorbed fertilizer not only increase agricultural production costs but also cause a series of ecological and environmental problems such as soil compaction, eutrophication of water bodies, and air pollution. Layered deep application of fertilizer to the seed, as a scientific fertilization method, allows fertilizer to be precisely applied to the soil layer 5-8 cm below the seed. This fundamentally avoids the seed and seedling burn caused by simultaneous sowing and fertilization in the same furrow, and allows crop roots to gradually extend downwards to absorb nutrients during growth and development, prolonging the fertilizer's effectiveness while reducing the amount of fertilizer used. Self-propelled pneumatic seeders, with their outstanding advantages such as high seeding accuracy, uniform plant and row spacing, low missed and reseeding rates, fast operating speed, and strong adaptability, have become the preferred equipment for large-scale planting of major crops such as corn, soybeans, and wheat. They organically combine the function of deep application of seeds and fertilizers with self-propelled pneumatic seeding technology, enabling multiple processes such as furrowing, fertilization, soil covering, sowing, and compaction to be completed in one operation. They are an important technological carrier for reducing agricultural labor intensity, achieving cost reduction and efficiency improvement, and promoting the development of green agriculture.

[0003] In existing technologies, seeders with fertilization functions mainly employ two operating modes: one is to first complete the sowing operation through the sowing mechanism, and then perform the fertilization operation separately, requiring two separate operations; the other is to apply fertilizer and seeds simultaneously, placing the fertilizer and seeds into the same furrow at the same time. Some seeders with stratified fertilization functions typically use fixed-depth fertilization furrow openers, controlling the fertilization depth by manually adjusting the height of the furrow openers beforehand. During operation, they cannot adjust in real time according to soil conditions and crop needs, and the timing and spatial coordination between fertilization and sowing is relatively inaccurate.

[0004] The existing technology has the following problems: it cannot achieve independent and precise ditching of sowing furrows and fertilizer furrows and dynamic adjustment of seed and fertilizer layering, which makes it difficult to control the spacing between seeds and fertilizers stably. This can easily lead to seedling burn and fail to fully utilize the fertilizer's effectiveness. At the same time, the synchronization between fertilization and sowing operations is poor, resulting in low overall operational efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a self-propelled pneumatic seeder with a seed-fertilizer layered deep application function. It aims to solve the problems of existing technologies being unable to achieve independent and precise furrowing of the seed furrow and fertilizer furrow, as well as dynamic adjustment of seed-fertilizer layering, which leads to unstable control of seed-fertilizer spacing, easy seedling burn, low fertilizer utilization rate, poor operation synchronization, and low overall efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a self-propelled pneumatic seeder with a layered deep application function of seed and fertilizer, comprising a frame, a fertilizer application mechanism and a furrowing mechanism provided on the frame, a support frame fixedly connected to the upper surface of the frame, a pneumatic seed supply device fixedly connected to the upper surface of the support frame, a docking frame fixedly connected to the upper surface of the support frame, and a seeding carriage fixedly connected to the rear end of the docking frame; The fertilizer application mechanism includes a storage tank and a motor. The output end of the motor is fixedly connected to a feeding shaft. The left end of the feeding shaft is fixedly connected to a first synchronous pulley. The outer wall of the first synchronous pulley is driven by a synchronous belt. The outer wall of the feeding shaft has a material groove. The bottom of the storage tank has a feeding port. The inner wall of the storage tank is rotatably connected to a rotating shaft through a bearing. The left end of the rotating shaft is fixedly connected to a second synchronous pulley. The upper end of the synchronous belt is driven by a synchronous belt connected to the outer wall of the second synchronous pulley. The outer wall of the rotating shaft is fixedly connected to a stirring blade. The trenching mechanism includes a first hydraulic cylinder, a first lifting frame is fixedly connected to the telescopic end of the first hydraulic cylinder, a connecting rod is fixedly connected to the bottom of the first lifting frame, and a trenching cutter is fixedly connected to the lower end of the connecting rod.

[0007] Preferably, the bottom of the storage box is fixedly connected to the upper surface of the frame, the left wall of the frame is fixedly connected to the mounting bracket, and the bottom of the motor is fixedly connected to the top of the mounting bracket.

[0008] Preferably, a feeding tube is fixedly connected to the bottom of the frame, the feeding shaft extends laterally through the feeding tube, and the feeding port is located inside the upper end of the feeding tube.

[0009] Preferably, the feeding shaft is located at the bottom of the feeding port, and the upper end of the storage box is hinged to a cover plate.

[0010] Preferably, the lower end of the first hydraulic cylinder is fixedly connected to the top of the frame, the bottom of the frame is fixedly connected to a wheel frame, and the side wall of the wheel frame is rotatably connected to a wheel via a bearing.

[0011] Preferably, a second hydraulic cylinder is fixedly connected to the upper surface of the vehicle frame, a second lifting frame is fixedly connected to the telescopic end of the second hydraulic cylinder, and a plow blade is fixedly connected to the bottom of the second lifting frame.

[0012] Preferably, a seed metering device is fixedly connected to the upper surface of the frame, a conveying pipe is fixedly connected to the top of the seed metering device, and the upper end of the conveying pipe is fixedly connected to the bottom of the pneumatic seed supply device.

[0013] Preferably, a seed guide tube is fixedly connected to the bottom of the seed metering device, and a soil covering wheel is provided at the front end of the frame.

[0014] Preferably, the trenching mechanism is provided with a soil covering mechanism, which includes a connecting frame. The rear end of the connecting frame is fixedly connected to the front of the first lifting frame, the bottom of the connecting frame is fixedly connected to a vertical rod, and the lower end of the vertical rod is fixedly connected to a soil covering plate, which is V-shaped.

[0015] Preferably, the upper surface of the connecting frame is provided with a through hole, the material feeding pipe passes through the interior of the through hole, and the material feeding pipe is located between the trenching cutter and the soil covering plate.

[0016] This invention provides a self-propelled pneumatic seeder with a layered deep application function for seeds and fertilizers. It has the following beneficial effects: 1. This invention adopts a structure in which the motor-driven feeding shaft and the stirring blade are synchronously linked. The synchronous transmission of power is achieved through the synchronous wheel and synchronous belt. While feeding the fertilizer in a quantitative manner, the fertilizer is continuously stirred, which effectively solves the problem of uneven feeding caused by fertilizer clumping. It realizes precise, stable and continuous delivery of fertilizer and improves the control accuracy of fertilizer application.

[0017] 2. This invention employs an independently hydraulically driven lifting furrowing blade structure, which allows for individual adjustment of the depth of the fertilizer furrow, creating a stable height difference with the sowing furrow opened by the plow blade. This achieves precise and controllable depth of seed and fertilizer layering, ensuring that the optimal safe distance is maintained between the seeds and fertilizer. This avoids burning seedlings and allows the crop roots to fully absorb fertilizer nutrients, thereby improving fertilizer utilization.

[0018] 3. This invention employs a V-shaped soil covering plate structure that rises and falls synchronously with the trenching mechanism. The feed pipe is positioned between the trenching blade and the soil covering plate, enabling immediate soil covering and isolation of the fertilizer trench after fertilization. This effectively prevents fertilizer volatilization and loss, while ensuring that seeds are sown in the clean soil layer above the fertilizer layer, creating a favorable soil environment for seed germination and seedling growth. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the vehicle frame structure of the present invention; Figure 3 This is a schematic diagram of the bottom structure of the vehicle frame of the present invention; Figure 4 This is a schematic diagram showing the location of the trenching mechanism of the present invention; Figure 5 This is a schematic cross-sectional view of the storage box structure of the present invention; Figure 6 This is a schematic diagram of the feeding shaft structure of the present invention; Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic diagram showing the position of the plow blade in this invention; Figure 9 This is a schematic diagram of the soil covering mechanism of the present invention.

[0020] The components include: 1. Frame; 2. Fertilizer application mechanism; 201. Storage bin; 202. Motor; 203. Discharge port; 204. Discharge pipe; 205. Discharge shaft; 206. Material trough; 207. First synchronous pulley; 208. Rotating shaft; 209. Mixing blade; 210. Second synchronous pulley; 211. Synchronous belt; 212. Cover plate; 3. Trenching mechanism; 301. First hydraulic cylinder; 302. First lifting frame; 303. Connecting... 304. Furrowing blade; 4. Soil covering mechanism; 401. Connecting frame; 402. Through hole; 403. Vertical rod; 404. Soil covering plate; 5. Mounting frame; 6. Support frame; 7. Pneumatic seed supply device; 8. Conveying pipe; 9. Seed metering device; 10. Seed guide pipe; 11. Soil covering wheel; 12. Second hydraulic cylinder; 13. Second lifting frame; 14. Plow blade; 15. Wheel frame; 16. Wheel; 17. Connecting frame; 18. Seeding vehicle. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 -Appendix Figure 4 This invention provides a self-propelled pneumatic seeder with a layered deep application function for seeds and fertilizers. It includes a frame 1, a fertilizer application mechanism 2 on the frame 1 for applying fertilizer to the soil, a ditching mechanism 3 on the frame 1 for opening fertilizer ditches in the seeding ditch to facilitate fertilization by the fertilizer application mechanism 2, a support frame 6 fixedly connected to the upper surface of the frame 1, a pneumatic seed supply device 7 fixedly connected to the upper surface of the support frame 6, a connecting frame 17 fixedly connected to the upper surface of the support frame 6, and a seeding carriage 18 fixedly connected to the rear end of the connecting frame 17. The seeding carriage 18 moves the frame 1 by pulling it through the connecting frame 17. Please see the appendix Figure 5 -Appendix Figure 7 The fertilizer applicator 2 includes a storage bin 201 and a motor 202. A feeding shaft 205 is fixedly connected to the output end of the motor 202. A first synchronous pulley 207 is fixedly connected to the left end of the feeding shaft 205. A synchronous belt 211 is driven to the outer wall of the first synchronous pulley 207. A material trough 206 is formed on the outer wall of the feeding shaft 205. A feeding port 203 is formed at the bottom of the storage bin 201. A rotating shaft 208 is rotatably connected to the inner wall of the storage bin 201 via bearings. A second synchronous pulley 210 is fixedly connected to the left end of the rotating shaft 208. The upper end of the synchronous belt 211 is driven to the outer wall of the second synchronous pulley 210. A stirring blade 209 is fixedly connected to the outer wall of the rotating shaft 208. Fertilizer is placed into the storage bin 201 for storage. Starting the motor 202 drives the feeding shaft 205 to rotate, which in turn drives the rotating shaft 208 to rotate via the synchronous pulley and synchronous belt 211. During rotation, the stirring blades 209 agitate the fertilizer, facilitating its discharge from the discharge port 203. The fertilizer falls into the trough 206 on the discharge shaft 205. As the discharge shaft 205 rotates, the fertilizer inside the trough 206 falls into the discharge pipe 204 when facing downwards, and finally into the fertilizer ditch. The structure, driven by the motor 202, synchronously links the discharge shaft 205 and the stirring blades 209. The synchronous transmission of power is achieved through the first synchronous wheel 207, the second synchronous wheel 210, and the synchronous belt 211. While discharging the fertilizer quantitatively, the fertilizer in the storage box 201 is continuously agitated, effectively solving the problem of uneven discharging caused by fertilizer clumping. The fertilizer falls precisely into the trough 206 through the discharge port 203 and is conveyed through the discharge pipe 204, achieving precise, stable, and continuous delivery of fertilizer and significantly improving the control accuracy of fertilizer application. The furrowing mechanism 3 includes a first hydraulic cylinder 301. A first lifting frame 302 is fixedly connected to the telescopic end of the first hydraulic cylinder 301. A connecting rod 303 is fixedly connected to the bottom of the first lifting frame 302. A furrowing cutter 304 is fixedly connected to the lower end of the connecting rod 303. By activating the first hydraulic cylinder 301, the position and height of the first lifting frame 302 can be adjusted, causing the furrowing cutter 304 to descend into the sowing furrow and create a deeper fertilizer furrow. The position of the furrowing cutter 304 can be adjusted to facilitate layering. Fertilization utilizes a lifting furrow cutter 304 structure driven independently by a first hydraulic cylinder 301, which allows for individual adjustment of the depth of the fertilizer furrow. This creates a stable height difference with the seed furrow opened by the plow blade 14 driven by a second hydraulic cylinder 12. The first lifting frame 302 can drive the furrow cutter 304 to adjust its height in real time, achieving precise control over the depth of seed-fertilizer layering. This ensures that the optimal safe distance is maintained between the seeds and fertilizer, preventing seedling burn and allowing the crop roots to fully absorb fertilizer nutrients, thus significantly improving fertilizer utilization.

[0023] The bottom of the storage box 201 is fixedly connected to the upper surface of the frame 1, and the left wall of the frame 1 is fixedly connected to the mounting bracket 5. The bottom of the motor 202 is fixedly connected to the top of the mounting bracket 5. The mounting bracket 5 facilitates the installation and fixation of the motor 202.

[0024] The bottom of the frame 1 is fixedly connected to a feeding pipe 204, and a feeding shaft 205 extends laterally through the feeding pipe 204. The feeding port 203 is located inside the upper end of the feeding pipe 204, and the feeding shaft 205 is located at the bottom of the feeding port 203. The upper end of the storage box 201 is hinged to a cover plate 212. Fertilizer can be easily added to the storage box 201 by opening the cover plate 212.

[0025] Please see the appendix Figure 8 The lower end of the first hydraulic cylinder 301 is fixedly connected to the top of the frame 1. The bottom of the frame 1 is fixedly connected to the wheel frame 15. The side wall of the wheel frame 15 is rotatably connected to the wheel 16 through the bearing. The wheel frame 15 and the wheel 16 facilitate the movement of the frame 1.

[0026] A second hydraulic cylinder 12 is fixedly connected to the upper surface of the frame 1. A second lifting frame 13 is fixedly connected to the telescopic end of the second hydraulic cylinder 12. A plow blade 14 is fixedly connected to the bottom of the second lifting frame 13. The position and height of the plow blade 14 can be adjusted by activating the second hydraulic cylinder 12. The plow blade 14 can open seeding furrows in the soil.

[0027] A seed metering device 9 is fixedly connected to the upper surface of the frame 1. A conveying pipe 8 is fixedly connected to the top of the seed metering device 9. The upper end of the conveying pipe 8 is fixedly connected to the bottom of the pneumatic seed supply device 7. A seed guide pipe 10 is fixedly connected to the bottom of the seed metering device 9. Crop seeds can be sown into the sowing furrow through the pneumatic seed supply device 7, the seed metering device 9 and the seed guide pipe 10. A soil covering wheel 11 is provided at the front end of the frame 1. The soil covering wheel 11 covers the sowing furrow with soil after sowing.

[0028] Please see the appendix Figure 9 The trenching mechanism 3 is equipped with a soil covering mechanism 4, which can cover the fertilizer trench with soil after fertilization. The soil covering mechanism 4 includes a connecting frame 401. The front of the first lifting frame 302 is fixedly connected to the rear end of the connecting frame 401. A vertical rod 403 is fixedly connected to the bottom of the connecting frame 401. A soil covering plate 404 is fixedly connected to the lower end of the vertical rod 403. The soil covering plate 404 is V-shaped. When the fertilizer falls into the fertilizer trench, the soil covering plate 404 can cover the fertilizer trench with soil, thereby facilitating the separation of fertilizer from crop seeds. This achieves soil covering and isolation of the fertilizer trench immediately after fertilization, effectively preventing the volatilization and loss of fertilizer. At the same time, it ensures that the seeds are sown in the clean soil layer above the fertilizer layer through the seed guide tube 10. Finally, the soil covering wheel 11 completes the overall soil covering and compaction, creating a good soil environment for seed germination and seedling growth.

[0029] The upper surface of the connecting frame 401 has a through hole 402, and the feeding pipe 204 passes through the inside of the through hole 402. The feeding pipe 204 is located between the furrowing knife 304 and the covering plate 404. The plow 14 is used to open the furrow for sowing, and then the furrowing knife 304 is used to open a fertilizer furrow in the sowing furrow. After the fertilizer falls into the fertilizer furrow through the feeding pipe 204, the covering plate 404 covers the fertilizer furrow with soil. Then the crop seeds fall into the sowing furrow, and the seeds are located above the fertilizer. Finally, the covering wheel 11 covers the sowing furrow with soil.

[0030] Working principle: The seeding vehicle 18 pulls the frame 1 along the working direction via the connecting frame 17, and activates the second hydraulic cylinder 12. Its telescopic end drives the second lifting frame 13 to descend, causing the plow blade 14 to cut into the soil and create a seeding furrow on the ground. Subsequently, the first hydraulic cylinder 301 is activated, and its telescopic end drives the first lifting frame 302 to descend, causing the furrowing blade 304 at the lower end of the connecting rod 303 to penetrate deeper into the bottom of the seeding furrow, creating a deeper fertilizer furrow within the seeding furrow.

[0031] The motor 202 of the fertilizer applicator 2 is started. The output end of the motor 202 drives the feeding shaft 205 to rotate. The first synchronous pulley 207 at the left end of the feeding shaft 205 drives the second synchronous pulley 210 to rotate through the synchronous belt 211, which in turn drives the rotating shaft 208 and the stirring blades 209 on the outer wall of the rotating shaft 208 to rotate synchronously, continuously stirring the fertilizer in the storage box 201 to prevent the fertilizer from clumping. The fertilizer falls into the trough 206 on the outer wall of the feeding shaft 205 through the feeding port 203 at the bottom of the storage box 201. As the feeding shaft 205 rotates, when the opening of the trough 206 faces downward, the fertilizer falls into the feeding pipe 204 and is accurately applied into the fertilizer trench through the feeding pipe 204.

[0032] After fertilization, the soil covering mechanism 4, which moves synchronously with the first lifting frame 302, begins to work. The connecting frame 401 moves the V-shaped soil covering plate 404 via the vertical rod 403 to initially cover the fertilizer trench with soil, isolating the fertilizer from the upper soil layer. At the same time, the airflow generated by the pneumatic seed supply device 7 transports the seeds through the conveying pipe 8 to the seed metering device 9. After the seed metering device 9 discharges a fixed amount of seeds, they are sown in the soil layer above the fertilizer layer in the sowing trench through the seed guide pipe 10. Finally, the soil covering wheel 11 on the frame 1 compacts the soil in the sowing trench, completing a full layered deep sowing operation.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-propelled pneumatic seeder with a layered deep application function for seed and fertilizer, comprising a frame (1), characterized in that, The frame (1) is provided with a fertilizer application mechanism (2), the frame (1) is provided with a ditching mechanism (3), the upper surface of the frame (1) is fixedly connected with a support frame (6), the upper surface of the support frame (6) is fixedly connected with a pneumatic seed supply device (7), the upper surface of the support frame (6) is fixedly connected with a docking frame (17), and the rear end of the docking frame (17) is fixedly connected with a seeding vehicle (18). The fertilizer application mechanism (2) includes a storage box (201) and a motor (202). The output end of the motor (202) is fixedly connected to a feeding shaft (205). The left end of the feeding shaft (205) is fixedly connected to a first synchronous pulley (207). The outer wall of the first synchronous pulley (207) is connected to a synchronous belt (211). The outer wall of the feeding shaft (205) is provided with a material trough (206). The bottom of the storage box (201) is provided with a feeding port (203). The inner wall of the storage box (201) is rotatably connected to a rotating shaft (208) through a bearing. The left end of the rotating shaft (208) is fixedly connected to a second synchronous pulley (210). The upper end of the synchronous belt (211) is connected to the outer wall of the second synchronous pulley (210). The outer wall of the rotating shaft (208) is fixedly connected to a stirring blade (209). The trenching mechanism (3) includes a first hydraulic cylinder (301), the telescopic end of the first hydraulic cylinder (301) is fixedly connected to a first lifting frame (302), the bottom of the first lifting frame (302) is fixedly connected to a connecting rod (303), and the lower end of the connecting rod (303) is fixedly connected to a trenching cutter (304).

2. The self-propelled pneumatic seeder with layered deep application of seed and fertilizer function according to claim 1, characterized in that, The bottom of the storage box (201) is fixedly connected to the upper surface of the frame (1), the left wall of the frame (1) is fixedly connected to the mounting bracket (5), and the bottom of the motor (202) is fixedly connected to the top of the mounting bracket (5).

3. A self-propelled pneumatic seeder with layered deep application of seed and fertilizer as described in claim 1, characterized in that, The bottom of the frame (1) is fixedly connected to a feed tube (204), the feed shaft (205) passes through the feed tube (204) laterally, and the feed port (203) is located inside the upper end of the feed tube (204).

4. A self-propelled pneumatic seeder with layered deep application of seed and fertilizer as described in claim 1, characterized in that, The feeding shaft (205) is located at the bottom of the feeding port (203), and the upper end of the storage box (201) is hinged to a cover plate (212).

5. A self-propelled pneumatic seeder with layered deep application of seed and fertilizer as described in claim 1, characterized in that, The lower end of the first hydraulic cylinder (301) is fixedly connected to the top of the frame (1), and the bottom of the frame (1) is fixedly connected to a wheel frame (15). The side wall of the wheel frame (15) is rotatably connected to a wheel (16) through a bearing.

6. A self-propelled pneumatic seeder with layered deep application of seed and fertilizer as described in claim 1, characterized in that, The upper surface of the frame (1) is fixedly connected to a second hydraulic cylinder (12), the telescopic end of the second hydraulic cylinder (12) is fixedly connected to a second lifting frame (13), and the bottom of the second lifting frame (13) is fixedly connected to a plow blade (14).

7. A self-propelled pneumatic seeder with layered deep application of seed and fertilizer as described in claim 3, characterized in that, A seed metering device (9) is fixedly connected to the upper surface of the frame (1), and a conveying pipe (8) is fixedly connected to the top of the seed metering device (9). The upper end of the conveying pipe (8) is fixedly connected to the bottom of the pneumatic seed supply device (7).

8. A self-propelled pneumatic seeder with a layered deep application function of seed and fertilizer as described in claim 7, characterized in that, The bottom of the seed metering device (9) is fixedly connected to a seed guide tube (10), and the front end of the frame (1) is provided with a soil covering wheel (11).

9. A self-propelled pneumatic seeder with a layered deep application function of seed and fertilizer as described in claim 8, characterized in that, The trenching mechanism (3) is provided with a soil covering mechanism (4). The soil covering mechanism (4) includes a connecting frame (401). The front of the first lifting frame (302) is fixedly connected to the rear end of the connecting frame (401). A vertical rod (403) is fixedly connected to the bottom of the connecting frame (401). A soil covering plate (404) is fixedly connected to the lower end of the vertical rod (403). The soil covering plate (404) is V-shaped.

10. A self-propelled pneumatic seeder with a layered deep application function of seed and fertilizer as described in claim 9, characterized in that, The upper surface of the connecting frame (401) is provided with a through hole (402), and the feeding pipe (204) passes through the interior of the through hole (402). The feeding pipe (204) is located between the trenching cutter (304) and the soil covering plate (404).

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