Seeding machine capable of precisely spraying pesticide

Abstract

The invention relates to the technical field of seeding machines, and discloses a precise pesticide spraying seeding machine which comprises a tractor and a seeding operation machine, the seeding operation machine comprises a rack, a seed hopper, a sand hopper and a water tank are fixedly mounted on the upper side of the rack, a plurality of conveying pipes extending downwards are fixedly mounted in the rack, and a fixed roller is fixedly mounted at a lower opening of the seed hopper; a rotating cylinder is rotationally 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 pipe, and a plurality of adsorption holes are formed in the surface of the rotating cylinder. The seed hopper, the sand hopper and the water tank are arranged to store seeds, sand and liquid medicine respectively, the seeds and the sand are sown together, the sand can be used for absorbing the liquid medicine, the function of spraying medicine before soil covering is achieved, in the sowing process, the sand absorbs the liquid medicine and wraps the seeds, the seeds and the liquid medicine are conveyed to the ground through the conveying pipe, and the sowing efficiency is improved. Compared with pesticide spraying after soil covering, more pesticide liquid is saved, and the effect of precise pesticide spraying and sowing is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of seed drills, and in particular to a precision spraying seed drill. Background Art

[0002] According to the sowing method, the seeder can be divided into a broadcast seeder and a row sowing type, a hole sowing type, a precision type, and a combined type. Generally, fertilization, spraying of pesticides, herbicides, etc. need to be performed while sowing. For example, in the prior art, a patent document with a publication number of CN109984005B discloses a sugarcane single bud precision seeder, on which a furrow opener, a seed planter, a soil coverer, a watering mechanism, a medicine spraying mechanism, and a film covering device are sequentially installed on the main frame from front to back, and the machine head is dragged to run, and furrowing, sowing, covering, watering, spraying, and film covering operations are performed in sequence. Sugarcane planting is completed; moreover, the walking detection unit of the sowing monitoring system is used to detect and record the walking information of the equipment, obtain the walking speed and stroke data, the seeding monitoring unit is used to detect and record the sowing information of the seeder, and issue an alarm when the number of sugarcane seeds is insufficient according to the sowing information, and control the speed of the power mechanism according to the speed and stroke data to adjust the sowing speed of the seeder, so that the spacing between each sugarcane seed in the ditch is uniform, and at the same time, each stroke unit of the ditch can be evenly and quantitatively watered, so as to realize the monitoring and intelligent control of the sugarcane sowing process.

[0003] In the existing seed drill, the spraying operation is carried out after the seeds are covered with soil. The amount of liquid medicine sprayed is large, otherwise it cannot be well immersed in the soil, resulting in a large amount of liquid medicine waste. Based on this, the existing seed drill has the defect that fine spraying is difficult to achieve, which brings inconvenience to the use and needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to solve the defect in the prior art that the existing seed drills are difficult to achieve fine spraying, and to propose a seed drill for precise spraying.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a precision spraying seeder, comprising a tractor and a seeding machine arranged on the tractor, the seeding machine comprising a frame, a seed bucket, a sand bucket and a water tank are fixedly installed on the upper side of the frame, and a plurality of downwardly extending delivery pipes are fixedly installed inside the frame.

[0006] A fixed roller is fixedly installed at the lower opening of the seed bucket, and 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 bucket and the upper opening of the conveying pipe. A plurality of adsorption holes are opened on the surface of the rotating cylinder, and an air pump is installed on the frame. The air pump sucks the air in the rotating cylinder to form a negative pressure at the adsorption holes to adsorb the seeds in the seed bucket.

[0007] A fixed cylinder is fixedly installed at the lower opening of the sand bucket, a rotating roller is rotatably installed in the fixed cylinder, a plurality of guide covers are fixedly installed on the surface of the fixed cylinder, the fixed cylinder is connected with each conveying pipe through the guide covers, and a nozzle is fixedly installed on the surface of the guide cover.

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

[0009] Preferably, the transmission assembly includes a driving gear and a reversing gear rotatably installed in the frame, a first gear fixedly installed at the end of the rotating cylinder, and a second gear fixedly installed at the end of the rotating roller. The rotating shaft of the roller drives the driving gear to rotate through a chain transmission, the driving gear meshes with the first gear for transmission, and the reversing gear meshes with the first gear and the second gear for transmission at the same time, and the walking speed is used to control the sowing speed.

[0010] Preferably, a negative pressure chamber and a positive pressure chamber are provided on the surface of the fixed roller, and two air ducts are installed at the end of the fixed roller, one air duct connects the negative pressure chamber with the air inlet of the vacuum pump, and the other air duct connects the positive pressure chamber with the air outlet of the vacuum pump. When sowing, negative pressure is formed at the adsorption holes to adsorb the seeds in the seed bucket.

[0011] Preferably, an air ducting hood with upper and lower openings is fixedly installed on the upper side of the air ducting hood, the upper opening of the air ducting hood is in sliding contact with the surface of the rotating cylinder, and the negative pressure chamber is connected with the inner cavity of the air ducting hood through the adsorption hole, and the lower opening of the negative pressure chamber is connected with the inner cavity of the air ducting hood. When sowing, the air in the positive pressure chamber is rhythmically introduced into the air ducting hood, and the sand and seeds are blown out from the conveying pipe, further increasing the sowing speed.

[0012] Preferably, a plurality of pusher plates are fixedly mounted on the surface of the rotating roller, and a protrusion is provided on the inner wall of the air guide cover. When the pusher plates are close to the protrusions, a storage chamber for temporarily storing materials is formed on the upper side of the pusher plates.

[0013] A metering pump is fixedly installed inside the water tank, and 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. A proximity sensor is fixedly installed on the surface of the conveying pipe, and the opening and closing of the electromagnetic valve is controlled by the proximity sensor. The sand bucket is filled with sand, and the seed bucket is filled with seeds. After the sand enters the storage chamber, the seeds fall to the surface of the sand in the storage chamber. After the proximity sensor detects the fall of the seeds, the electromagnetic valve is opened in conjunction, and liquid medicine is sprayed into the storage chamber through the nozzle. Part of the sand is soaked and wraps the seeds. When the push plate is away from the raised portion, the airflow in the induced draft hood blows the sand and seeds to the lower end of the conveying pipe and discharges them, so that the sand wraps the seeds, increases the weight of the seeds, and increases the speed of falling in the conveying pipe.

[0014] Preferably, the frame is hung on the rear side of the tractor. A universal shaft is rotatably installed on the rear side of the tractor. A belt drive mechanism for driving the air pump to operate is rotatably installed inside the frame. The tractor drives the air pump to operate through the universal shaft and the belt drive mechanism.

[0015] A swing arm is rotatably installed on the lower side of the frame. A spring pressure rod is movably installed 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 installed at 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 groove on the ground. The sand material and seeds fall into the groove. The soil covering plate is used to push the soil to cover the groove to complete soil covering.

[0016] The present invention has the following beneficial effects: 1. For the seeder proposed by the present invention, by providing a seed hopper, a sand hopper and a water tank to store seeds, sand materials and liquid medicine respectively, the seeds and sand materials are sown together. The sand materials can absorb the liquid medicine to realize the function of spraying medicine before soil covering. When sowing in this way, the sand materials absorb the liquid medicine and wrap the seeds, which is beneficial to transporting the seeds and liquid medicine to the ground through the conveying pipe. Compared with spraying medicine after soil covering, it saves more liquid medicine and achieves the effect of precise spraying and sowing.

[0017] 2. For the seeder proposed by the present invention, by providing a rotating cylinder to transport seeds to the flow guide cover, a rotating roller to transport sand materials to the flow guide cover, and spraying liquid medicine into the flow guide cover by using a nozzle, the seeds, sand materials and liquid medicine are sown together. The liquid medicine wets part of the sand materials, so that the sand materials wrap the seeds, increasing the weight of the seeds and improving the falling speed of the seeds in the conveying pipe. There is also part of the dry sand materials that absorb the moisture in the conveying pipe to prevent the seeds from adhering to the inner wall of the pipe, achieving the effect of rapid seed dropping. In particular, for the existing seeder, the sowing speed is controlled by the walking speed. If the seed dropping speed is slow and the walking speed is constant, it will lead to a larger sowing spacing. In the case of small-spacing sowing, when the seed dropping speed increases, the walking speed also increases, which can greatly improve the sowing efficiency.

[0018] 3. For the seeder proposed by the present invention, by providing an air guiding cover between the rotating cylinder and the flow guide cover, the air guiding cover connects the positive pressure chamber and the flow guide cover. When sowing, the air in the positive pressure chamber is rhythmically introduced into the flow guide cover to blow the sand materials and seeds out of the conveying pipe, further improving the seed dropping speed. At the same time, the air flow blows the sand materials to be discharged downward from the conveying pipe, and the sand materials are used to scour the inner wall of the pipe, which has the function of dredging the conveying pipe and has a good anti-blocking effect.

[0019] 4. For the seeder proposed by the present invention, when sowing multiple seeds in one hole, multiple seeds are mixed in the sand materials and discharged into the planting hole together. The sand materials play a buffering and blocking protection role, which can well prevent the seeds from bouncing out and causing the problem of empty holes, improving the plant establishment rate. In particular, in the sowing process of high-speed seed dropping, the problem of empty holes is most likely to occur. Brief Description of the Drawings

[0020] Figure 1 This is a three-dimensional structure schematic diagram of the whole of the present invention; Figure 2 This is a three-dimensional structure schematic diagram of the seeding operation machine proposed by the present invention; Figure 3 is Figure 1 the enlarged schematic diagram of the structure at A in Figure 4 This is a three-dimensional structure schematic diagram of the rotating cylinder and the fixed cylinder proposed by the present invention; Figure 5 This is a side sectional structure schematic diagram of the seeding operation machine proposed by the present invention; Figure 6 is Figure 5 the partial enlarged schematic diagram of

[0021] In the figure: 1, frame; 2, seed hopper; 3, water tank; 4, conveying pipe; 5, fixed roller; 6, rotating cylinder; 7, adsorption hole; 8, air extraction pump; 9, fixed cylinder; 10, rotating roller; 11, diversion cover; 12, nozzle; 13, drive gear; 14, reversing gear; 15, first gear; 16, second gear; 17, negative pressure chamber; 18, positive pressure chamber; 19, air guiding cover; 20, pushing plate; 21, convex part; 22, proximity sensor; 23, swing arm; 24, spring pressure rod; 25, furrow opener; 26, soil covering plate; 27, sand hopper. Detailed Embodiment

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Referring to Figures 1 - 6 , a precision spraying seeder includes a tractor and a seeding operation machine arranged on the tractor. The seeding operation machine includes a frame 1, and the frame 1 is hung on the rear side of the tractor. A seed hopper 2, a sand hopper 27 and a water tank 3 are respectively fixedly installed on the upper side of the frame 1. A plurality of downwardly extending conveying pipes 4 are fixedly installed inside the frame 1.

[0024] As Figure 3 shown, a swing arm 23 is rotatably installed on the lower side of the frame 1. A spring pressure rod 24 is movably installed 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 furrow opener 25 and a soil covering plate 26 are fixedly installed at the lower end of the swing arm 23. The lower end of the conveying pipe 4 extends to a position between the furrow opener 25 and the soil covering plate 26.

[0025] Referring to Figure 4A fixed roller 5 is fixedly installed at the lower opening of the seed bucket 2, and 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 bucket 2 and the upper opening of the conveying pipe 4. A plurality of adsorption holes 7 are opened on the surface of the rotating cylinder 6. An air pump 8 is installed on the frame 1. A universal shaft is rotatably installed on the rear side of the tractor. A belt transmission mechanism for driving the air pump 8 is rotatably installed inside the frame 1. The tractor drives the air pump 8 to operate through the universal shaft and the belt transmission mechanism. The air pump 8 sucks the air in the rotating cylinder 6 to form a negative pressure at the adsorption holes 7 to adsorb the seeds in the seed bucket 2. It should be noted that the tractor is a mature product of the prior art, and the tractor drives the air pump 8 to operate through the universal shaft and the belt transmission mechanism, which belongs to the conventional setting of the prior art and 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 in the fixed cylinder 9, a plurality of guide covers 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 covers 11, and a nozzle 12 is fixedly installed on the surface of the guide covers 11; wherein, reference Figure 5 A metering pump is fixedly installed inside the water tank 3, and an electromagnetic valve is provided at the outlet end of the metering pump. 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 that the seeds have fallen, the electromagnetic valve is opened in conjunction.

[0027] A roller is rotatably mounted on the lower side of the frame 1 , and a transmission assembly is mounted inside the frame 1 . The roller drives 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 driving 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 rotating shaft of the roller drives the driving gear 13 to rotate through a chain transmission. The driving gear 13 is meshed with the first gear 15 for transmission. The reversing gear 14 is meshed with the first gear 15 and the second gear 16 for transmission. When the tractor drags the seeding machine to walk, the roller rolls on the ground, such as Figure 6 As shown, both the rotating drum 6 and the rotating roller 10 are driven to 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, and two air ducts are installed at the end of the fixed roller 5. One air duct connects the negative pressure chamber 17 and the air inlet of the vacuum pump 8, and the other air duct connects the positive pressure chamber 18 and the air outlet of the vacuum pump 8.

[0030] An air induced draft hood 19 with upper and lower openings is fixedly installed on the upper side of the air guide hood 11. The upper opening of the air induced draft hood 19 is in sliding contact with the surface of the rotating cylinder 6, and the negative pressure chamber 17 is connected with the inner cavity of the air induced draft hood 19 through the adsorption hole 7, and the lower opening of the negative pressure chamber 17 is connected with the inner cavity of the air guide hood 11. When the vacuum pump 8 is running, the vacuum pump 8 pumps the air in the negative pressure chamber 17 into 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 bucket 2. As the rotating cylinder 6 rotates, the seeds fall into the conveying pipe 4; positive pressure is formed in the positive pressure chamber 18, and the air in the positive pressure chamber 18 is introduced into the air induced draft hood 19 through the adsorption hole 7 on the lower side, and finally enters the air guide hood 11.

[0031] Among them, Figure 6 As shown, a plurality of push plates 20 are fixedly mounted on the surface of the rotating roller 10, and a protrusion 21 is provided on the inner wall of the air deflector 11. When the push plate 20 is close to the protrusion 21, a storage chamber for temporarily storing materials is formed on the upper side of the push plate 20. When the tractor drags the seeding machine, the roller rolls on the ground, the rotating roller 10 rotates clockwise, and the push 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 drum 6 and the rotating roller 10. This is common knowledge and will not be elaborated here.

[0032] During use, see Figure 6 , the sand hopper 27 is filled with sand, the seed hopper 2 is filled with seeds, and the water tank 3 is filled with insecticide solution. 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, the electromagnetic valve is opened in conjunction, and the solution is sprayed into the storage chamber through the nozzle 12. Part of the sand is soaked and wraps the seeds. When the push plate 20 is away from the raised portion 21, the airflow in the induced draft hood 19 blows the sand and seeds to the lower end of the conveying pipe 4 and discharges them; The furrow opener 25 opens a furrow on the ground, sand and seeds fall into the furrow, and the soil is pushed into the furrow by the covering plate 26 to cover the furrow, thereby completing the covering.

[0033] The seeder proposed in the present invention transports seeds to the air guide hood 11 by arranging a rotating drum 6, transports sand by arranging a rotating roller 10, and sprays liquid medicine in the air guide hood 11 by using a nozzle 12. Seeds, sand and liquid medicine are mixed and sown together. The liquid medicine wets part of the sand so that the sand wraps the seeds, increases the weight of the seeds, and improves the speed of falling into the conveying pipe 4. When part of the dry sand is discharged, it absorbs moisture in the conveying pipe 4 to prevent the seeds from adhering to the pipe wall, thereby achieving the effect of rapid seed dropping. In particular, the existing seeder uses the walking speed to control the sowing speed. If the sowing speed is slow and the walking speed is constant, the sowing spacing will be larger. In the case of small spacing sowing, the sowing speed is improved, and the walking speed is also improved, which can greatly improve the sowing efficiency.

[0034] By arranging an air guiding cover 19 between the rotating cylinder 6 and the air deflector 11, the air guiding cover 19 connects the positive pressure chamber 18 and the air deflector 11. During seeding, the air in the positive pressure chamber 18 is rhythmically introduced into the air deflector 11, blowing the sand and seeds out of the conveying pipe 4, further increasing the seed dropping speed. At the same time, the airflow blows the sand downward out of the conveying pipe 4, using the sand to scour the inner wall of the pipe, which has the effect of dredging the conveying pipe 4 and has a good anti-blocking effect.

[0035] In addition, since the air extraction pump 8 pumps the air in the negative pressure chamber 17 into the positive pressure chamber 18, and the upper adsorption holes 7 adsorb seeds, many impurities will cause the adsorption holes 7 to become blocked. As the rotating cylinder 6 rotates, the air in the positive pressure chamber 18 exhausts from the adsorption holes 7 into the air guiding cover 19, which can blow back the adsorption holes 7, achieving the effect of clearing blockages and ensuring the reliable operation of the rotating cylinder 6.

[0036] A plurality of holes are arranged in parallel beside the adsorption holes 7, and multiple seeds can be adsorbed through the adsorption holes 7, enabling the multiple seeds to fall into the air deflector 11, realizing multi-seed sowing in one hole. During multi-seed sowing in one hole, multiple seeds are mixed in the sand and discharged into the planting hole together. The sand plays a buffering and blocking protective role, which can well prevent the seeds from bouncing out and causing the problem of empty holes, improving the plant survival rate. Especially in the seeding process of high-speed seed dropping, the problem of empty holes is most likely to occur.

[0037] The seeding machine proposed by the present invention stores seeds, sand, and liquid medicine respectively by arranging a seed hopper 2, a sand hopper 27, and a water tank 3, enabling the seeds and sand to be sown together. The sand can absorb the liquid medicine, realizing the function of spraying medicine before covering the soil. When sowing in this way, the sand absorbs the liquid medicine and wraps the seeds, which is beneficial to transporting the seeds and liquid medicine to the ground through the conveying pipe 4. Compared with spraying medicine after covering the soil, it does not require a large amount of liquid medicine to wet the surface soil, saving more liquid medicine and achieving the effect of precise spraying and seeding. After sowing, by watering, the action range of the liquid medicine is expanded. In addition, fertilizers are mixed into the sand, and the fertilization work can be completed while sowing, making it more convenient to use.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent replacements or changes, should be covered by the protection scope of the present invention.

Claims

1. A precision spraying seeder, comprising a tractor and a seeding machine arranged on the tractor, characterized in that: The seeding machine comprises a frame (1), a seed bucket (2), a sand bucket (27) and a water tank (3) are fixedly mounted on the upper side of the frame (1), and a plurality of downwardly extending delivery pipes (4) are fixedly mounted inside the frame (1); A fixed roller (5) is fixedly installed at the lower opening of the seed bucket (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 bucket (2) and the upper opening of the conveying pipe (4), a plurality of adsorption holes (7) are opened on the surface of the rotating cylinder (6), and an air pump (8) is installed on the frame (1), and the air pump (8) sucks air in the rotating cylinder (6) to form a negative pressure at the adsorption holes (7) to adsorb seeds in the seed bucket (2); A fixed cylinder (9) is fixedly installed at the lower opening of the sand bucket (27), a rotating roller (10) is rotatably installed in the fixed cylinder (9), a plurality of flow guide covers (11) are fixedly installed on the surface of the fixed cylinder (9), the fixed cylinder (9) is respectively connected to each conveying pipe (4) through the flow guide covers (11), and a nozzle (12) is fixedly installed on the surface of the flow guide covers (11); A roller is rotatably mounted on the lower side of the frame (1), and a transmission assembly is mounted inside the frame (1). The roller drives the rotating cylinder (6) and the rotating roller (10) to rotate in the same direction through the transmission assembly.

2. A precision spraying seeder according to claim 1, characterized in that: The transmission assembly comprises a driving 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 rotating shaft of the roller drives the driving gear (13) to rotate through a chain transmission, the driving gear (13) meshes with the first gear (15) for transmission, and the reversing gear (14) meshes with the first gear (15) and the second gear (16) for transmission at the same time.

3. A precision spraying seeder according to claim 2, characterized in that: A negative pressure chamber (17) and a positive pressure chamber (18) are provided on the surface of the fixed roller (5), and two air guide tubes are installed at the end of the fixed roller (5), one air guide tube connects the negative pressure chamber (17) with the air inlet of the air pump (8), and the other air guide tube connects the positive pressure chamber (18) with the air outlet of the air pump (8).

4. A precision spraying seeder according to claim 3, characterized in that: An air induced draft hood (19) with upper and lower openings is fixedly mounted on the upper side of the air guide hood (11); the upper opening of the air induced draft hood (19) is in sliding contact with the surface of the rotating cylinder (6); the negative pressure chamber (17) is connected to the inner cavity of the air induced draft hood (19) through the adsorption hole (7); and the lower opening of the negative pressure chamber (17) is connected to the inner cavity of the air guide hood (11).

5. A precision spraying seeder according to claim 4, characterized in that: A plurality of pusher plates (20) are fixedly mounted on the surface of the rotating roller (10), and a protrusion (21) is provided on the inner wall of the air guide cover (11). When the pusher plates (20) are close to the protrusions (21), a storage chamber for temporarily storing materials is formed on the upper side of the pusher plates (20).

6. A precision spraying seeder according to claim 5, characterized in that: A metering pump is fixedly installed inside the water tank (3), an outlet end of the metering pump is provided with an electromagnetic valve, and the outlet end of the electromagnetic valve is connected to the nozzle (12), and a proximity sensor (22) is fixedly installed on the surface of the delivery pipe (4), and the opening and closing of the electromagnetic valve is controlled by the proximity sensor (22).

7. A precision spraying seeder according to claim 6, characterized in that: 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, the electromagnetic valve is opened and the liquid medicine is sprayed into the storage chamber through the nozzle (12). Part of the sand is soaked and wraps the seeds. When the push plate (20) is away from the raised portion (21), the airflow in the induced draft hood (19) blows the sand and seeds to the lower end of the conveying pipe (4) and discharges them.

8. A precision spraying seeder according to any one of claims 1 to 7, characterized in that: The frame (1) is hung on the rear side of the tractor, a universal shaft is rotatably mounted on the rear side of the tractor, a belt transmission mechanism for driving the vacuum pump (8) to operate is rotatably mounted inside the frame (1), and the tractor drives the vacuum pump (8) to operate via the universal shaft and the belt transmission mechanism.

9. A precision spraying seeder according to claim 8, characterized in that: A swing arm (23) is rotatably mounted on the lower side of the frame (1); 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 on the frame (1); a furrow opener (25) and a soil covering plate (26) are fixedly mounted on the lower end of the swing arm (23); and the lower end of the conveying pipe (4) extends to a position between the furrow opener (25) and the soil covering plate (26).

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