A precision pesticide spraying seeder

Abstract

This invention relates to the field of seeder technology and discloses a precision spraying seeder, comprising a tractor and a seeding machine. The seeding machine includes a frame, with a seed hopper, a sand hopper, and a water tank fixedly mounted on the upper side of the frame. Multiple downward-extending conveying pipes are fixedly mounted inside the frame. A fixed roller is fixedly mounted at the lower opening of the seed hopper, and a rotating cylinder is rotatably mounted on the surface of the fixed roller. The surface of the rotating cylinder is in sliding contact with the lower opening of the seed hopper and the upper opening of the conveying pipes. Several adsorption holes are formed on the surface of the rotating cylinder. This invention, by setting up a seed hopper, a sand hopper, and a water tank to store seeds, sand, and pesticide solution respectively, allows seeds and sand to be sown together. The sand absorbs the pesticide solution, achieving the function of spraying pesticide before covering the soil. During sowing in this way, the sand absorbs the pesticide solution and coats the seeds, facilitating the delivery of seeds and pesticide solution to the ground through the conveying pipes. Compared to spraying pesticide after covering the soil, this method saves pesticide solution and achieves the effect of precision spraying.

Description

Technical Field

[0001] This invention relates to the field of seeders, and more particularly to a precision spraying seeder. Background Technology

[0002] Seeders can be classified into broadcast seeders and row seeders, hill seeders, precision seeders, and combined seeders according to their sowing methods. Generally, fertilization, pesticide spraying, and herbicide application are performed simultaneously with sowing. For example, patent document CN109984005B discloses a sugarcane single-bud precision seeder. The main frame is equipped with a furrow opener, seeder, soil covering device, watering mechanism, pesticide spraying mechanism, and mulching device, which operate under the pull of the machine head, sequentially performing furrow opening, seeding, soil covering, watering, pesticide spraying, and mulching operations. The system completes sugarcane planting; moreover, the sowing monitoring system's walking detection unit is used to detect and record the equipment's walking information, acquiring walking speed and travel data. The sowing monitoring unit is used to detect and record the sowing information of the sowing device, and issue an alarm when the number of sugarcane seeds is insufficient based on the sowing information. It also controls the rotation speed of the power mechanism based on the speed and travel data to adjust the sowing speed of the sowing device, ensuring uniform spacing between sugarcane plants in the furrow. At the same time, it can perform uniform and quantitative watering operations on each travel unit in the furrow, realizing the monitoring and intelligent control of the sugarcane sowing process.

[0003] Existing seeders spray pesticides after the seeds have been covered with soil, resulting in a large amount of pesticide being sprayed. Otherwise, the pesticide cannot penetrate the soil well, leading to a significant waste of pesticide. As a result, existing seeders have the drawback of being unable to achieve precise spraying, causing inconvenience to users and urgently needing a solution. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing seeders in achieving precise spraying, and to propose a precision spraying seeder.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a precision spraying seeder, comprising a tractor and a seeding machine mounted on the tractor, the seeding machine comprising a frame, a seed hopper, a sand hopper and a water tank respectively fixedly mounted on the upper side of the frame, and a plurality of downwardly extending conveying pipes fixedly mounted inside the frame.

[0006] A fixed roller is fixedly installed at the lower opening of the seed hopper. A rotating cylinder is rotatably installed on the surface of the fixed roller. The surface of the rotating cylinder is in sliding contact with the lower opening of the seed hopper and the upper opening of the conveying pipe. Several adsorption holes are opened on the surface of the rotating cylinder. An air pump is installed on the frame. The air pump draws air from the rotating cylinder, creating a negative pressure at the adsorption holes to adsorb the seeds in the seed hopper.

[0007] A fixed cylinder is fixedly installed at the lower opening of the sand bucket. A rotating roller is rotatably installed inside the fixed cylinder. Multiple guide shrouds are fixedly installed on the surface of the fixed cylinder. The fixed cylinder is connected to each conveying pipe through the guide shrouds. Nozzles are fixedly installed on the surface of the guide shrouds.

[0008] Rollers are rotatably mounted on the lower side of the frame, and a transmission assembly is installed inside the frame. The rollers drive the rotating cylinder and rotating roller to rotate in the same direction through the transmission assembly, so that the seeds and sand are mixed together for sowing.

[0009] Preferably, the transmission assembly includes a drive gear and a reversing gear rotatably mounted in the frame, a first gear fixedly mounted at the end of the rotating drum, and a second gear fixedly mounted at the end of the rotating roller. The roller shaft drives the drive gear to rotate via chain transmission. The drive gear meshes with the first gear, and the reversing gear meshes with both the first and second gears simultaneously. The sowing speed is controlled by the walking speed.

[0010] Preferably, the surface of the fixed roller is provided with a negative pressure chamber and a positive pressure chamber, and two air guide pipes are installed at the end of the fixed roller. One air guide pipe connects the negative pressure chamber to the air inlet of the air pump, and the other air guide pipe connects the positive pressure chamber to the air outlet of the air pump. During sowing, a negative pressure is formed at the adsorption hole to adsorb the seeds in the seed hopper.

[0011] Preferably, an air guide hood with upper and lower openings is fixedly installed on the upper side of the air guide hood. The upper opening of the air guide hood slides in contact with the surface of the rotating cylinder. The negative pressure chamber is connected to the inner cavity of the air guide hood through an adsorption hole, and the lower opening of the negative pressure chamber is connected to the inner cavity of the air guide hood. During sowing, the air in the positive pressure chamber is rhythmically introduced into the air guide hood, blowing the sand and seeds out from the conveying pipe, further improving the seeding speed.

[0012] Preferably, a plurality of pusher plates are fixedly installed on the surface of the rotating roller, and a protrusion is provided on the inner wall of the guide shroud. When the pusher plate is close to the protrusion, a storage chamber for temporary material storage is formed on the upper side of the pusher plate.

[0013] A metering pump is fixedly installed inside the water tank. An electromagnetic valve is installed at the outlet of the metering pump, and the outlet of the electromagnetic valve is connected to a nozzle. A proximity sensor is fixedly installed on the surface of the conveying pipe. The electromagnetic valve is opened and closed by the proximity sensor. The sand hopper contains sand and the seed hopper contains seeds. After the sand enters the storage chamber, the seeds fall onto the surface of the sand in the storage chamber. After the proximity sensor detects the seeds falling, it activates the electromagnetic valve and sprays the liquid into the storage chamber through the nozzle. Some of the sand is wetted and wraps the seeds. When the pusher plate moves away from the protrusion, the airflow in the fan hood blows the sand and seeds to the lower end of the conveying pipe and discharges them. This causes the sand to wrap the seeds, increasing the weight of the seeds and increasing the speed at which the seeds fall into the conveying pipe.

[0014] Preferably, the frame is mounted on the rear side of the tractor, a universal joint is rotatably mounted on the rear side of the tractor, and a belt drive mechanism for driving the air pump is rotatably mounted inside the frame. The tractor drives the air pump through the universal joint and the belt drive mechanism.

[0015] A swing arm is rotatably mounted on the lower side of the frame, and a spring pressure rod is movably mounted on the upper side of the swing arm. The top end of the spring pressure rod is slidably inserted into the frame. A furrow opener and a soil covering plate are fixedly mounted on the lower end of the swing arm. The lower end of the conveying pipe extends to the position between the furrow opener and the soil covering plate. The furrow opener opens a trench in the ground, and sand and seeds fall into the trench. The soil covering plate pushes the soil to cover the trench, thus completing the soil covering.

[0016] The present invention has the following beneficial effects: 1. The seeder proposed in this invention is equipped with a seed hopper, a sand hopper, and a water tank to store seeds, sand, and pesticide solution respectively, so that seeds and sand are sown together. The sand can absorb the pesticide solution, realizing the function of spraying pesticide before covering the soil. When sowing in this way, the sand absorbs the amount of pesticide solution and wraps the seeds, which is conducive to transporting seeds and pesticide solution to the ground through the delivery pipe. Compared with spraying pesticide after covering the soil, it saves more pesticide solution and achieves the effect of precision spraying and sowing.

[0017] 2. The seeder proposed in this invention uses a rotating cylinder to transport seeds through a flow guide shroud, a rotating roller to transport sand through the flow guide shroud, and a nozzle to spray pesticide solution into the flow guide shroud. Seeds, sand, and pesticide solution are sown together. The pesticide solution wets part of the sand, causing the sand to coat the seeds, increasing the seed weight and improving the speed at which the sand falls into the conveying pipe. Part of the sand is dried to absorb moisture in the conveying pipe, preventing the seeds from adhering to the pipe wall, thus achieving a rapid seeding effect. In particular, existing seeders control the sowing speed by using the walking speed. If the seeding speed is slow and the walking speed is constant, it will result in a large sowing spacing. With small-spacing sowing, the seeding speed is increased, and the walking speed is also increased, which can greatly improve the sowing efficiency.

[0018] 3. The seeder proposed in this invention sets up an air duct between the rotating cylinder and the guide duct. The air duct connects the positive pressure chamber and the guide duct. During sowing, the air in the positive pressure chamber is rhythmically introduced into the guide duct, blowing sand and seeds out from the conveying pipe, further increasing the seeding speed. At the same time, the airflow blows the sand out of the conveying pipe downwards, using the sand to wash the inner wall of the pipe, which has the function of unblocking the conveying pipe and has a good anti-clogging effect.

[0019] 4. The seeder proposed in this invention can mix multiple seeds in sand when sowing multiple seeds in one hole. The sand is then discharged into the planting hole together, and the sand plays a buffering and blocking role, which can effectively prevent the seeds from bouncing out and causing empty holes, thus improving the survival rate. This is especially true in the high-speed seed dropping process, where empty holes are most likely to occur. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the seeding machine proposed in this invention; Figure 3 for Figure 1 Enlarged schematic diagram of the structure at point A in the diagram; Figure 4 This is a three-dimensional structural diagram of the rotating cylinder and the fixed cylinder proposed in this invention; Figure 5 This is a side sectional view of the seeding machine proposed in this invention; Figure 6 for Figure 5 A magnified view of a portion of the image.

[0021] In the diagram: 1. Frame; 2. Seed hopper; 3. Water tank; 4. Conveying pipe; 5. Fixed roller; 6. Rotating cylinder; 7. Adsorption hole; 8. Air pump; 9. Fixed cylinder; 10. Rotating roller; 11. Flow guide; 12. Nozzle; 13. Drive gear; 14. Reversing gear; 15. First gear; 16. Second gear; 17. Negative pressure chamber; 18. Positive pressure chamber; 19. Air duct; 20. Push plate; 21. Protrusion; 22. Proximity sensor; 23. Swing arm; 24. Spring pressure rod; 25. Ditch opener; 26. Covering plate; 27. Sand hopper. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Reference Figures 1-6 A precision spraying seeder includes a tractor and a seeding machine mounted on the tractor. The seeding machine includes a frame 1, which is mounted on the rear side of the tractor. A seed hopper 2, a sand hopper 27, and a water tank 3 are fixedly installed on the upper side of the frame 1. Multiple downward-extending conveying pipes 4 are fixedly installed inside the frame 1.

[0024] like Figure 3 As shown, a swing arm 23 is rotatably mounted on the lower side of the frame 1, and a spring pressure rod 24 is movably mounted on the upper side of the swing arm 23. The top end of the spring pressure rod 24 is slidably inserted into the frame 1. A trencher 25 and a soil covering plate 26 are fixedly mounted on the lower end of the swing arm 23. The lower end of the conveying pipe 4 extends to the position between the trencher 25 and the soil covering plate 26.

[0025] refer to Figure 4A fixed roller 5 is fixedly installed at the lower opening of the seed hopper 2. A rotating cylinder 6 is rotatably installed on the surface of the fixed roller 5. The surface of the rotating cylinder 6 is in sliding contact with the lower opening of the seed hopper 2 and the upper opening of the conveying pipe 4. Several suction holes 7 are opened on the surface of the rotating cylinder 6. An air pump 8 is installed on the frame 1. A universal joint is rotatably installed on the rear side of the tractor. A belt drive mechanism that drives the air pump 8 is rotatably installed inside the frame 1. The tractor drives the air pump 8 to operate through the universal joint and the belt drive mechanism. The air pump 8 draws air from the rotating cylinder 6, creating a negative pressure at the suction holes 7 to adsorb the seeds in the seed hopper 2. It should be noted that the tractor is a mature product of existing technology, and the tractor driving the air pump 8 through the universal joint and the belt drive mechanism is a conventional setting of existing technology, which will not be elaborated here.

[0026] A fixed cylinder 9 is fixedly installed at the lower opening of the sand bucket 27. A rotating roller 10 is rotatably installed inside the fixed cylinder 9. Multiple guide shrouds 11 are fixedly installed on the surface of the fixed cylinder 9. The fixed cylinder 9 is connected to each conveying pipe 4 through the guide shrouds 11. A nozzle 12 is fixedly installed on the surface of the guide shroud 11; wherein, reference Figure 5 A metering pump is fixedly installed inside the water tank 3. An electromagnetic valve is installed at the outlet end of the metering pump, and the outlet end of the electromagnetic valve is connected to the nozzle 12. A proximity sensor 22 is fixedly installed on the surface of the delivery pipe 4. The opening and closing of the electromagnetic valve is controlled by the proximity sensor 22. After the proximity sensor 22 detects the seeds falling, it opens the electromagnetic valve in conjunction.

[0027] Rollers are rotatably mounted on the lower side of the frame 1, and a transmission assembly is installed inside the frame 1. The rollers drive the rotating cylinder 6 and the rotating roller 10 to rotate in the same direction through the transmission assembly.

[0028] Specifically, the transmission assembly includes a drive gear 13 and a reversing gear 14 rotatably mounted within the frame 1, a first gear 15 fixedly mounted at the end of the rotating drum 6, and a second gear 16 fixedly mounted at the end of the rotating roller 10. The roller's shaft drives the drive gear 13 to rotate via a chain drive. The drive gear 13 meshes with the first gear 15, and the reversing gear 14 simultaneously meshes with both the first gear 15 and the second gear 16. When the tractor tows the seeder, the rollers roll on the ground, such as... Figure 6 As shown, both the drive cylinder 6 and the drive roller 10 rotate clockwise.

[0029] In this embodiment, a negative pressure chamber 17 and a positive pressure chamber 18 are provided on the surface of the fixed roller 5. Two air guide pipes are installed at the end of the fixed roller 5. One air guide pipe connects the negative pressure chamber 17 to the air inlet of the air pump 8, and the other air guide pipe connects the positive pressure chamber 18 to the air outlet of the air pump 8.

[0030] An air guide shroud 19 with upper and lower openings is fixedly installed on the upper side of the air guide shroud 11. The upper opening of the air guide shroud 19 slides in contact with the surface of the rotating cylinder 6, and the negative pressure chamber 17 is connected to the inner cavity of the air guide shroud 19 through the adsorption hole 7. The lower opening of the negative pressure chamber 17 is connected to the inner cavity of the air guide shroud 11. When the air pump 8 is running, the air pump 8 pumps the air in the negative pressure chamber 17 to the positive pressure chamber 18, forming a negative pressure in the negative pressure chamber 17 and forming a negative pressure at the adsorption hole 7 to adsorb the seeds in the seed hopper 2. As the rotating cylinder 6 rotates, the seeds fall into the conveying pipe 4. A positive pressure is formed in the positive pressure chamber 18, and the air in the positive pressure chamber 18 is introduced into the air guide shroud 19 through the lower adsorption hole 7 and finally enters the air guide shroud 11.

[0031] Among them, such as Figure 6 As shown, multiple pusher plates 20 are fixedly installed on the surface of the rotating roller 10. The inner wall of the guide shroud 11 is provided with a protrusion 21. When the pusher plate 20 is close to the protrusion 21, a storage chamber for temporary material storage is formed on the upper side of the pusher plate 20. When the tractor tows the seeding machine, the roller rolls on the ground, the rotating roller 10 rotates clockwise, and the pusher plate 20 pushes the sand in the sand bucket 27 into the storage chamber. It should be noted that the transmission ratio of the reversing gear 14, the first gear 15 and the second gear 16 determines the speed difference between the rotating cylinder 6 and the rotating roller 10. This is common knowledge and will not be elaborated here.

[0032] For details on usage, please refer to [link / reference]. Figure 6 Sand hopper 27 contains sand, seed hopper 2 contains seeds, and water tank 3 contains insecticide. After the sand enters the storage chamber, the seeds fall onto the surface of the sand in the storage chamber. After the proximity sensor 22 detects the seeds falling, it activates the solenoid valve and sprays the insecticide into the storage chamber through nozzle 12. Some of the sand is wetted and wraps the seeds. When the pusher plate 20 moves away from the protrusion 21, the airflow in the duct 19 blows the sand and seeds to the lower end of the conveying pipe 4 and discharges them. The trencher 25 creates trenches in the ground, and sand and seeds fall into the trenches. The soil covering plate 26 pushes the soil to cover the trenches, completing the covering.

[0033] The seeder proposed in this invention uses a rotating cylinder 6 to transport seeds to a flow hood 11, a rotating roller 10 to transport sand to the flow hood 11, and a nozzle 12 to spray a pesticide solution into the flow hood 11. The seeds, sand, and pesticide solution are mixed together for sowing. The pesticide solution moistens part of the sand, causing the sand to coat the seeds, increasing the seed weight and improving the speed at which the sand falls into the conveying pipe 4. Additionally, when some dry sand is discharged, it absorbs moisture from the conveying pipe 4, preventing the seeds from adhering to the pipe wall, thus achieving a rapid seeding effect. In particular, existing seeders control the sowing speed by using the walking speed. If the seeding speed is slow and the walking speed is constant, the sowing spacing will be large. With small-spacing sowing, the seeding speed is increased, and the walking speed is also increased, which can greatly improve the sowing efficiency.

[0034] By setting an air duct 19 between the rotating cylinder 6 and the guide duct 11, the air duct 19 connects the positive pressure chamber 18 and the guide duct 11. During sowing, the air in the positive pressure chamber 18 is rhythmically introduced into the guide duct 11, blowing the sand and seeds out of the conveying pipe 4, further increasing the seeding speed. At the same time, the airflow blows the sand out of the conveying pipe 4 downwards, using the sand to flush the inner wall of the pipe, which has the function of unblocking the conveying pipe 4 and has a good anti-clogging effect.

[0035] In addition, since the air pump 8 pumps the air in the negative pressure chamber 17 to the positive pressure chamber 18, the upper adsorption hole 7 adsorbs seeds. Many impurities will cause the adsorption hole 7 to become blocked. As the rotating cylinder 6 rotates, the air in the positive pressure chamber 18 is exhausted from the adsorption hole 7 into the exhaust hood 19, which can backflush the adsorption hole 7, clear the blockage, and ensure the reliable operation of the rotating cylinder 6.

[0036] Several holes are opened side by side next to the adsorption hole 7, which can adsorb multiple seeds and let them fall into the guide hood 11, realizing multiple sowing in one hole. When sowing multiple seeds in one hole, multiple seeds are mixed in sand and discharged into the planting hole together. The sand plays a buffering and blocking role, which can effectively prevent seeds from bouncing out and causing empty holes, thus improving the survival rate. In particular, the problem of empty holes is most likely to occur in the high-speed seed dropping process.

[0037] The seeder proposed in this invention stores seeds, sand, and pesticide solution in a seed hopper 2, a sand hopper 27, and a water tank 3, respectively. This allows seeds and sand to be sown together, and the sand can absorb the pesticide solution, enabling spraying before covering the soil. During sowing, the sand absorbs the pesticide solution and coats the seeds, facilitating the delivery of seeds and pesticide solution to the ground via the delivery pipe 4. Compared to spraying after covering the soil, it eliminates the need to soak the surface soil with a large amount of pesticide solution, saving more pesticide solution and achieving the effect of precise spraying and sowing. After sowing, watering expands the effective range of the pesticide solution. In addition, fertilizer can be mixed into the sand, allowing fertilization to be completed simultaneously with sowing, making it more convenient to use.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A precision spraying seeder, comprising a tractor and a seeding machine mounted on the tractor, characterized in that: The seeding machine includes a frame (1), and a seed hopper (2), a sand hopper (27) and a water tank (3) are fixedly installed on the upper side of the frame (1). Multiple conveying pipes (4) extending downward are fixedly installed inside the frame (1). A fixed roller (5) is fixedly installed at the lower opening of the seed hopper (2). A rotating cylinder (6) is rotatably installed on the surface of the fixed roller (5). The surface of the rotating cylinder (6) slides in contact with the lower opening of the seed hopper (2) and the upper opening of the conveying pipe (4). Several adsorption holes (7) are opened on the surface of the rotating cylinder (6). An air pump (8) is installed on the frame (1). The air pump (8) draws air from the rotating cylinder (6) to create a negative pressure at the adsorption holes (7) to adsorb the seeds in the seed hopper (2). A fixed cylinder (9) is fixedly installed at the lower opening of the sand bucket (27). A rotating roller (10) is rotatably installed inside the fixed cylinder (9). Multiple guide hoods (11) are fixedly installed on the surface of the fixed cylinder (9). The fixed cylinder (9) is connected to each conveying pipe (4) through the guide hoods (11). A nozzle (12) is fixedly installed on the surface of the guide hoods (11). Rollers are rotatably mounted on the lower side of the frame (1), and a transmission assembly is installed inside the frame (1). The rollers drive the rotating cylinder (6) and the rotating roller (10) to rotate in the same direction through the transmission assembly. The surface of the fixed roller (5) is provided with a negative pressure chamber (17) and a positive pressure chamber (18). Two air guide pipes are installed at the end of the fixed roller (5). One air guide pipe connects the negative pressure chamber (17) to the air inlet of the air pump (8), and the other air guide pipe connects the positive pressure chamber (18) to the air outlet of the air pump (8). The upper side of the flow guide shroud (11) is fixedly installed with an air duct (19) with openings at the top and bottom. The upper opening of the air duct (19) slides in contact with the surface of the rotating cylinder (6), and the positive pressure chamber (18) is connected to the inner cavity of the air duct (19) through the adsorption hole (7). The lower opening of the air duct (19) is connected to the inner cavity of the flow guide shroud (11). Multiple pusher plates (20) are fixedly installed on the surface of the rotating roller (10), and a protrusion (21) is provided on the inner wall of the flow guide (11). When the pusher plate (20) and the protrusion (21) are close together, a storage chamber for temporary material storage is formed on the upper side of the pusher plate (20). A metering pump is fixedly installed inside the water tank (3). An electromagnetic valve is provided at the outlet end of the metering pump, and the outlet end of the electromagnetic valve is connected to the nozzle (12). A proximity sensor (22) is fixedly installed on the surface of the delivery pipe (4). The opening and closing of the electromagnetic valve is controlled by the proximity sensor (22). The sand hopper (27) contains sand, and the seed hopper (2) contains seeds. After the sand enters the storage chamber, the seeds fall onto the surface of the sand in the storage chamber. After the proximity sensor (22) detects the seeds falling, it activates the electromagnetic valve and sprays liquid into the storage chamber through the nozzle (12). Some of the sand is wetted and wraps the seeds. When the pusher plate (20) moves away from the protrusion (21), the airflow in the duct (19) blows the sand and seeds to the lower end of the conveying pipe (4) and discharges them.

2. The precision spraying seeder according to claim 1, characterized in that: The transmission assembly includes a drive gear (13) and a reversing gear (14) rotatably mounted in the frame (1), a first gear (15) fixedly mounted at the end of the rotating cylinder (6), and a second gear (16) fixedly mounted at the end of the rotating roller (10). The roller shaft drives the drive gear (13) to rotate via chain transmission. The drive gear (13) meshes with the first gear (15) for transmission, and the reversing gear (14) meshes with both the first gear (15) and the second gear (16) for transmission.

3. A precision spraying seeder according to any one of claims 1-2, characterized in that: The frame (1) is mounted on the rear side of the tractor. A universal joint is rotatably installed on the rear side of the tractor. A belt drive mechanism that drives the air pump (8) is rotatably installed inside the frame (1). The tractor drives the air pump (8) through the universal joint and the belt drive mechanism.

4. A precision spraying seeder according to claim 3, characterized in that: A swing arm (23) is rotatably mounted on the lower side of the frame (1), and a spring pressure rod (24) is movably mounted on the upper side of the swing arm (23). The top end of the spring pressure rod (24) is slidably inserted into the frame (1). A trencher (25) and a soil covering plate (26) are fixedly mounted on the lower end of the swing arm (23). The lower end of the conveying pipe (4) extends to the position between the trencher (25) and the soil covering plate (26).

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