Pelletized coated seed sowing unmanned aerial vehicle system

Abstract

The invention discloses a pelletized coated seed sowing unmanned aerial vehicle system which comprises a machine body, a sowing box, a motor and blades, the sowing box is fixed below the machine body and is loaded with pelletized coated seeds, a cold box is arranged at the top of the machine body, a cooling element is arranged at the center of the bottom of the cold box in a contact mode, and the top face of the cooling element is flush with the upper surface of the machine body; the seeding box comprises a top cover and a box body, the lower part of the through hole is connected with a mixing pipe, water inlet pipes are obliquely arranged on the two sides of the mixing pipe, a cooling medium in the cooling box is conveyed into a shell of the motor through a pump body and a first conveying pipe so as to dissipate heat of the motor, and the cooling medium after absorbing heat is conveyed to the water inlet pipes through a second conveying pipe; and the water flows into the mixing pipe through the water inlet pipe to spray the pelletized coated seeds. The problem of low heat dissipation efficiency of the motor is effectively solved through the independent heat dissipation system, the heat dissipation process and the wetting process are organically combined, and the problems of low heat dissipation efficiency, non-uniform wetting and the like are solved.

Description

Technical Field

[0001] The present application belongs to the technical field of agricultural drone operation, and specifically is a pelletized coated seed sowing drone system. Background Art

[0002] In existing drone seeding systems, pelletized coated seeds are used more and more widely. Pelletized coated seeds are made by coating the surface of seeds with one or more layers of special materials. These coating materials usually contain fertilizers, pesticides, trace nutrients, etc., which can be gradually released during the germination process of seeds, effectively improving the growth of crops. In order to ensure that these materials can play their full role, the surface treatment of coated seeds is particularly important. In addition, in the prior art, heat dissipation devices, such as heat sinks, are usually set in drone systems to help reduce the heat generated by motors and other electronic equipment during operation, and ensure the normal operation of the equipment in high-temperature working environments.

[0003] However, there are still some problems in the prior art that need to be solved. First, although the existing heat dissipation device can reduce the temperature of the equipment to a certain extent, its heat dissipation efficiency is still insufficient in high-temperature working environments, which may affect the continuous operation performance of the drone. Secondly, although the prior art has proposed solutions for sprinkling seeds with water tanks, the structural designs of these solutions are relatively simple, and the heat dissipation device and the sprinkler device are usually independent, and they are not organically combined or integrated with the overall sowing process of the sowing system. For the sowing scene of the plant protection drone, the heat dissipation and sprinkler functions are difficult to achieve the best effect in actual application, and are not optimized for the characteristics of pelletized coated seeds. Specifically, the existing watering method is difficult to ensure uniform wetting of the surface of the coated seeds, resulting in the coating material may not be able to fully exert its function, thereby affecting the germination rate of the seeds and the growth effect of the crop. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a pelletized coated seed sowing UAV system, which effectively solves the problem of low motor heat dissipation efficiency through an independent heat dissipation system, and organically combines the heat dissipation process with the wetting process. Through a reasonable structural layout and a flow path of the cooling medium, it not only effectively reduces the operating temperature of the UAV equipment, but also ensures the uniform wetting of the surface of the pelletized coated seeds, thereby improving the seed germination rate and sowing effect, and overcoming the problems of low heat dissipation efficiency, uneven wetting, etc. in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A pelletized coated seed sowing drone system comprises a machine body, a sowing box, a motor and a paddle, wherein the sowing box is fixed below the machine body and loaded with pelletized coated seeds, the motor is mounted on a machine arm of the machine body, the paddle is arranged above the motor and driven to rotate by the motor, a cold box is arranged on the top of the machine body, a cooling element is arranged in contact with the bottom center of the cold box, and the top surface of the cooling element is flush with the upper surface of the machine body, the sowing box comprises a top cover and a box body, the box body comprises a cylindrical section, a conical section and a bottom plate, two symmetrically arranged through holes are arranged on the bottom plate, a mixing tube is connected to the lower part of the through hole, water inlet pipes are obliquely arranged on both sides of the mixing tube, the cooling medium in the cold box is transported to the housing of the motor through a pump body and a first conveying pipe to dissipate the heat of the motor, the cooling medium after absorbing heat is transported to the water inlet pipe through a second conveying pipe, and flows into the mixing pipe through the water inlet pipe to spray the pelletized coated seeds.

[0007] Preferably, the cooling element is a semiconductor refrigeration sheet, the upper end of which is a cold end and the lower end is a hot end.

[0008] Preferably, a stirring shaft is provided in the box body, and a stirring blade and a rotating plate are provided on the stirring shaft. The stirring blade is located at the interface between the cylindrical section and the conical section. The rotating plate is a long strip plate in contact with the bottom plate. Driven by the stirring shaft, the rotating plate can intermittently block the two through holes.

[0009] Preferably, one end of the stirring shaft passing through the bottom plate is connected to a diffusion disk, and the diffusion disk rotates with the stirring shaft. The other end of the stirring shaft is connected to a stirring motor, and the stirring motor is fixed at the lower part of the top cover and is located in the box body.

[0010] Preferably, a fan is arranged on the lower side of the semiconductor refrigeration plate, and the fan includes a conical wind hood and fan blades. The conical wind hood is arranged below the cooling element at intervals, and the fan blades are located in the conical wind hood and can rotate forward or reverse. The fan is fixed at the center of the body through a bracket, and the air outlet of the fan is connected to the seed box through a first air duct. The top cover is provided with an air inlet that is connected to the first air duct, and the top cover is also provided with an air outlet.

[0011] Preferably, the fan comprises a fan shaft, and the stirring motor is a double-shaft motor, the lower shaft of which is connected to the stirring shaft, and the upper shaft is connected to the fan shaft via a gear set for speed-increasing transmission.

[0012] Preferably, an annular duct is provided in the cold box, the inlet end of the annular duct is connected to the outlet of the pump body, a plurality of nozzles passing through the side wall of the cold box are provided on the annular duct, the number of the nozzles is consistent with the number of the motors, and the nozzles are connected to the first delivery pipe.

[0013] Preferably, the first and second conveying pipes are made of insulating materials, and the first and second conveying pipes are detachably connected to the motor, nozzle and water inlet pipe, and the connected first and second conveying pipes are fixed to the machine body or seed box by fixing parts.

[0014] Preferably, the mixing tube and the through hole are detachably connected, the angle between the water inlet pipe and the axis of the mixing tube is 30° to 60°, and the inner diameter of the water inlet pipe gradually decreases in the direction toward the mixing tube.

[0015] Preferably, a water inlet is provided on the top wall of the cold box, and the top wall and the side walls are coated with a heat-insulating coating or wrapped with a heat-insulating material.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) The present invention can effectively dissipate heat from the UAV motor by setting up an independent heat dissipation system, thereby preventing the motor from performance degradation and failure due to overheating, significantly extending the service life of the UAV, and improving the reliability and operation continuity of the equipment. After absorbing heat, the cooling medium can be reused to moisten the seeds, reducing the need for additional moistening water sources, reducing the weight of the UAV, and improving the overall operation efficiency and endurance.

[0018] (2) The present invention realizes precise control of the temperature of the cooling medium in the cold box by providing a semiconductor refrigeration sheet. The semiconductor refrigeration sheet can dynamically adjust the temperature of the cooling medium according to the operation requirements to ensure that it flows within an appropriate range. This not only ensures the effective heat dissipation of the motor, but also conducts part of the heat to the seeding box to dry the pelletized coated seeds in the seeding box and moderately pressurizes the seeding box, thereby effectively promoting the smooth sowing of the seeds.

[0019] (3) The present invention designs a mixing tube so that the cooling medium flows downward at a certain speed, forming a negative pressure in the mixing tube, guiding the seeds to be sprinkled out from the through holes. At the same time, the seeds are fully mixed with the cooling medium during the sprinkling process, ensuring that the pelletized coated seeds are properly moistened while being sprinkled, thereby improving the sowing effect.

[0020] (4) The present invention achieves sufficient stirring of the seeds in the seeding box through the design of the stirring blades and the rotating plate, thereby preventing the seeds from clumping or settling in the box. In particular, the rotating plate can intermittently close the through holes, thereby effectively controlling the sowing speed, ensuring that the seeds are evenly distributed in the farmland, and improving the accuracy and effect of sowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0022] Figure 1 This is an overall schematic diagram of a pelletized coated seed sowing drone system according to an embodiment of the present invention;

[0023] Figure 2 A top view of a pelletized coated seed sowing drone system according to an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a seeding box according to an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the connection of a stirring device according to an embodiment of the present invention;

[0026] Figure 5 A top view of a stirring device in one state shown in an embodiment of the present invention;

[0027] Figure 6 A top view of another state of the stirring device shown in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection of a fan according to an embodiment of the present invention.

[0029] Figure 8 for Figure 1 A partial enlarged view of point A.

[0030] Reference numerals: 1-machine body; 11-machine arm; 2-seeding box; 21-top cover; 211-air inlet; 212-air outlet; 22-box; 221-cylindrical section; 222-conical section; 223-bottom plate; 224-through hole; 23-mixing tube; 24-water inlet pipe; 25-stirring shaft; 26-stirring blade; 27-rotating plate; 28-diffuser disk; 29-stirring motor; 291-lower end shaft; 292-upper end shaft; 293-gear set; 3-motor; 4-blade; 5-cold box; 51-pump body; 52-first delivery pipe; 53-second delivery pipe; 54-annular duct; 55-side wall; 56-nozzle; 57-top wall; 58-water inlet; 6-cooling element; 61-upper end; 62-lower end; 7-fan; 71-conical wind hood; 72-fan blade; 73-bracket; 74-air outlet; 75-first air duct; 76-fan blade shaft. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are only for illustrative purposes. In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "include" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may be present or added.

[0032] In addition, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. All technical and scientific terms used in this specification have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0033] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] See also Figure 1-8 The present embodiment provides a pelletized coated seed sowing UAV system, comprising a body 1, a sowing box 2, a motor 3 and a blade 4. The sowing box 2 is fixed below the body 1 and loaded with pelletized coated seeds. The motor 3 is mounted on the arm 11 of the body 1, and the blade 4 is arranged above the motor 3 and driven to rotate by the motor 3. The blade 4 is used to provide lift, drive the UAV to take off and maintain its stability in the air, so that the UAV can perform precise sowing operations in the air.

[0035] A cold box 5 is arranged on the top of the fuselage 1, and a cooling element 6 is arranged in contact with the bottom center of the cold box 5. The top surface of the cooling element 6 is flush with the upper surface of the fuselage 1, ensuring that the cooling element 6 can provide cooling for the cold box 5. The compact structure does not affect the overall design and center of gravity of the drone. The bottom of the cold box 5 is in contact with the upper surface of the fuselage 1 except the center, and the structural strength of the fuselage 1 can be effectively used to support the weight of the cold box 5. In addition, the bottom of the cold box 5 can also be used to dissipate heat for the fuselage 1.

[0036] The seeding box 2 includes a top cover 21 and a box body 22. The box body 22 includes a cylindrical section 221, a conical section 222 and a bottom plate 223. Two through holes 224 arranged symmetrically are provided on the bottom plate 223, which help the seeds to be evenly sprinkled from the seeding box 2 and ensure the accuracy of seeding. A mixing pipe 23 is connected to the lower part of the through hole 224. Water inlet pipes 24 are obliquely provided on both sides of the mixing pipe 23. The water inlet pipes 24 are arranged in an inclined manner to ensure that the cooling medium can enter the mixing pipe 23 at an appropriate angle and be fully mixed with the pelletized coated seeds to achieve efficient wetting.

[0037] The cooling medium in the cold box 5 is transported to the housing of the motor 3 through the pump body 51 and the first delivery pipe 52 to dissipate the heat of the motor 3. This process effectively reduces the working temperature of the motor 3, prevents overheating, and improves the operation stability and life of the drone. The cooling medium after absorbing heat is transported to the water inlet pipe 24 through the second delivery pipe 53, flows into the mixing pipe 23 through the water inlet pipe 24, and sprays the pelletized coated seeds. After cooling the motor 3 and other key components, the temperature of the cooling medium has been adjusted to a temperature suitable for use as a wetting agent, and the seeds can be uniformly wetted at a suitable temperature, which not only realizes the reuse of the cooling medium and reduces resource waste, but also promotes the improvement of sowing effect and germination rate by wetting the surface of the seeds. At the same time, the cooling medium also effectively reduces the weight of the cold box 5 with the discharge of the seeds, reduces the load of the drone, helps to improve the flight performance and endurance of the drone, and reduces the safety risks that may be caused by excessive load during the sowing process.

[0038] In the selection of cooling medium, the most preferred medium is low temperature pure water, which not only has good thermal conductivity and heat storage effect, but also can not have adverse effects on pelletized coated seeds when they are wetted. In addition, some specific additives can be added to pure water to enhance the heat storage capacity and antifreeze performance of pure water, while ensuring that it does not have any adverse effects on pelletized coated seeds when mixed with them. In order to further improve the cold storage capacity of the cold box 5, some ice cubes can also be placed in the cold box 5. The melting and heat absorption process of the ice cubes can significantly extend the effective cooling time of the cooling medium, thereby providing a more lasting cooling effect when the motor 3 is working at high intensity, and ensuring the efficient operation of the entire heat dissipation system.

[0039] The cooling element 6 is a semiconductor refrigeration sheet, the upper end 61 of which is the cold end and the lower end 62 is the hot end. The function of the cooling element 6 is to keep the cooling medium in the cold box 5 in a low temperature state, so as to ensure that the cooling medium can effectively dissipate heat for the motor 3 during the entire operation process. Through the cold end of the semiconductor refrigeration sheet, the cold amount is directly transferred to the cooling medium in the cold box 5, so that it is kept within the ideal low temperature range, thereby enhancing the overall heat dissipation effect of the system. Before the drone takes off, the cooling medium in the cold box 5 can be selected as low-temperature ice water. This preliminary cooling measure can effectively reduce the workload of the semiconductor refrigeration sheet. Since the cooling medium is already at a relatively low temperature before takeoff, the cooling element 6 only needs to maintain this temperature without the need for a large number of cooling operations, thereby reducing energy consumption and extending the service life of the cooling element 6.

[0040] See also Figure 4-6 In this embodiment, a stirring shaft 25 is provided in the box body 22, and a stirring blade 26 and a rotating plate 27 are installed on the stirring shaft 25. These components belong to the stirring device. The stirring blade 26 is located at the interface between the cylindrical section 221 and the conical section 222. The stirring blade 26 can effectively stir the seeds in the sowing box 2 to avoid the deposition of seeds and ensure the smooth outflow of seeds. The rotating plate 27 is a long strip plate, which is in contact with the bottom plate 223. Driven by the stirring shaft 25, the rotating plate 27 rotates accordingly, and can intermittently block the two through holes 224 on the bottom plate 223. By controlling the rotation speed of the rotating plate 27, the outflow speed of the seeds can be controlled, and the sowing rate can be adjusted according to the actual sowing needs to ensure that the seeds are evenly spread.

[0041] One end of the stirring shaft 25 passing through the bottom plate 223 is connected to a diffusion disk 28, which rotates synchronously with the rotation of the stirring shaft 25. The diffusion disk 28 can change the movement direction of the seeds after the seeds flow out of the seeding box 2, adjust the landing point and scattering angle of the seeds, and effectively improve the uniformity of sowing. The other end of the stirring shaft 25 is connected to a stirring motor 29, which is fixed at the lower part of the top cover 21 and located in the box body 22. The stirring motor 29 provides power for the stirring shaft 25, and the speed of the stirring motor 29 is adjustable, driving the stirring shaft 25 and the stirring blades 26 and rotating plate 27 attached thereto to effectively stir and control. This design ensures the uniformity of the seeds and the controllability of the sowing process, and helps to improve the sowing effect and efficiency.

[0042] See also Figure 7A fan 7 is provided on the lower side of the semiconductor refrigeration plate 6, and the fan 7 includes a conical wind cover 71 and a fan blade 72. The conical wind cover 71 is arranged at intervals below the cooling element 6. This design ensures that when the fan 7 is running, the air flow can be effectively guided, and the heat generated during the operation of the semiconductor refrigeration plate can be discharged in time through the fan 7 to avoid the accumulation of such heat and affect the heat dissipation performance of the body 1. The fan blade 72 is located in the conical wind cover 71 and can rotate forward or reverse. The fan 7 is fixed to the center of the body 1 by a bracket, which ensures the balance of the center of gravity of the entire system and facilitates the effective distribution of air.

[0043] The air outlet of the fan 7 is connected to the sowing box 2 through the first air duct 75, and the top cover 21 is provided with an air inlet 211, which is connected to the first air duct 75 to ensure that the airflow enters the sowing box 2 smoothly. At this time, the fan blade 72 is in forward rotation. The fan 7 introduces the heat generated by the semiconductor refrigeration sheet 6 into the sowing box 2 through the airflow, which can not only dry and disturb the pelletized coated seeds to prevent the seeds from agglomerating, but also pressurize the inside of the sowing box 2 to a certain extent, ensuring that the seeds can be smoothly sprinkled from the bottom of the sowing box 2, thereby improving the sowing efficiency. The top cover 21 is also provided with an air outlet 212 to ensure that the airflow eventually flows out of the sowing box 2. Under extreme working conditions, such as when the temperature in the sowing box 2 is too high or the temperature of the motor 3 in the sowing box 2 is too high, this situation may affect the activity of the seeds or the service life of the motor 3. At this time, the fan blade 72 is reversed to take out the hot air in the sowing box 2 and replace the air, thereby protecting the seeds and ensuring the normal working state of the motor 3, and extending the service life of the equipment.

[0044] See also Figure 4 In some embodiments, the fan 7 includes a fan shaft 76, and the stirring motor 29 is a double-shaft motor. The lower shaft 291 of the stirring motor 29 is connected to the stirring shaft 25, driving the stirring shaft 25 to rotate, thereby driving the stirring blades 26 and the rotating plate 27 to stir the seeds in the seed box 2 to ensure uniform distribution of the seeds. The upper shaft 292 of the stirring motor 29 is connected to the fan shaft 76 through the gear set 293, and the speed is increased. The stirring shaft 25 and the fan blade 72 are driven by one motor at the same time, thereby simplifying the system and improving efficiency. Since the speed requirement of the fan blade 72 is usually higher than that of the stirring shaft 25, the transmission ratio design of the gear set 293 is used to increase the fan blade speed, so that the fan blade 72 can run at a higher speed and provide sufficient airflow to perform the heat dissipation function.

[0045] See also Figure 2An annular conduit 54 is provided in the cold box 5. The inlet end of the annular conduit 54 is connected to the outlet of the pump body 51. The cooling medium is transported to the inside of the annular conduit 54 through the pump body 55. A plurality of nozzles 56 are provided on the annular conduit 54. These nozzles 56 pass through the side wall 55 of the cold box 5 and are connected to the first delivery pipe 52, so that the cooling medium can accurately flow to the motor 3 through the nozzles 56. The number of nozzles 56 is consistent with the number of motors 3, ensuring that each motor 3 can be fully cooled to prevent overheating caused by uneven cooling.

[0046] In order to improve the thermal management efficiency of the system, the pipes of the first delivery pipe 52 and the second delivery pipe 53 are made of insulating materials. The selection of this material can effectively reduce the heat loss of the cooling medium during the transmission process and ensure the maximization of the cooling effect. At the same time, the first delivery pipe 52 and the second delivery pipe 53 are all detachably connected to the motor 3, the nozzle 56 and the water inlet pipe 24. This design facilitates the installation and maintenance of the system. At the same time, when a failure occurs or a component needs to be replaced, it can also be handled quickly, thereby improving the operational efficiency and reliability of the drone. The connected first delivery pipe 52 and the second delivery pipe 53 are fixed to the body 1 or the seed box 2 by fixings, ensuring that the delivery pipes can work stably during the flight and operation of the drone, avoiding loose connections or damage caused by vibration or external forces, thereby improving the overall reliability and durability of the system.

[0047] See also Figure 1 The top wall 57 of the cold box 5 is provided with a water inlet 58, through which the cooling medium can be conveniently injected into the cold box 5, ensuring the continuous operation of the heat dissipation system and the stability of the cooling effect. In order to further improve the heat preservation performance of the cold box 5, the top wall 57 and the side wall 55 are coated with a heat insulating coating or wrapped with a heat insulating material. This design can effectively reduce the heat loss of the cooling medium in the cold box 5, keep it at a low temperature, and ensure that the cooling medium can still maintain an ideal temperature during long-term operation.

[0048] See also Figure 8Furthermore, the mixing tube 23 and the through hole 224 are detachably connected. This design takes into account the maintenance and cleaning requirements of the system. Through the detachable connection, the user can easily clean, inspect or replace the mixing tube 23 and the through hole 224 to ensure the long-term stable operation of the system. The axial angle between the water inlet pipe 24 and the mixing tube 23 is 30° to 60°. This angle design is optimized to enable the cooling medium to enter the mixing tube 23 at the best angle, thereby enhancing the fluidity and mixing effect of the cooling medium. The inner diameter of the water inlet pipe 24 gradually decreases along the direction toward the mixing tube 23. This design of gradually decreasing inner diameter helps to increase the flow rate of the cooling medium. Through this structure, the cooling medium flows downward at a certain speed, forming a negative pressure in the mixing tube 23, thereby effectively guiding the seeds to be smoothly sprinkled out from the through hole 224 and fully mixed with the cooling medium. In this process, the pelletized coated seeds are moderately moistened, ensuring that the seeds have good water absorption and germination conditions when sowing. The coating layer of the seeds usually contains fertilizers, micronutrients and other additives. Through appropriate wetting, these coating ingredients can dissolve and penetrate more effectively, thereby providing initial nutrient support for the germination of the seeds. In addition, after the wet seeds come into contact with the soil, they can absorb moisture in the soil more quickly, thereby accelerating the growth and germination process of the radicle, which is crucial to improving the emergence rate and uniformity of the crops. In addition, the mixing tube 23 can also effectively guide the movement direction of the seeds sprinkled from the through hole 224, so that the seeds accurately flow to the diffusion disk 28, thereby avoiding the situation where the seeds are randomly scattered. The weight of the seeds after wetting increases, which further reduces the possibility of seed scattering, thereby improving the uniformity of sowing.

[0049] In summary, the present invention provides a pelletized coated seed sowing drone system, which accurately delivers the cooling medium to the motor 3 and key components through the annular conduit 54 and multiple nozzles 56 by setting an independent heat dissipation system, realizes efficient heat dissipation function, effectively prolongs the service life of the motor 3, and improves the stability of the drone in a high-temperature working environment, and uses the cooling medium to moisten the pelletized coated seeds after heat dissipation, avoiding the need to set up a water tank separately and reducing the workload of the drone system. The semiconductor refrigeration sheet 6 plays a core role in the present invention, and the heat at its lower end is introduced into the sowing box 2 through the fan 7, which not only provides reliable heat dissipation for the motor 3, but also appropriately dries and disturbs the seeds, ensuring uniform distribution and smooth sowing of the seeds. The specially designed mixing tube 23 of the present invention forms a negative pressure through a reasonable structure to guide the seeds to be sprinkled out from the through hole 224, and is fully mixed with the cooling medium during the sprinkling process, ensuring that the pelletized coated seeds are properly moistened when sown, which not only enhances the water absorption and germination conditions of the seeds, but also guides the movement direction of the spilled seeds to ensure that they are evenly covered in the sowing area, thereby avoiding random drifting, and further improving the uniformity and effect of sowing. Through the above design, the present invention successfully solves many technical problems of pelletized coated seeds in the process of drone sowing, making the entire sowing process more efficient and reliable, and providing a more advanced and practical drone sowing system for agricultural production.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pelletized coated seed sowing drone system, comprising a machine body (1), a sowing box (2), a motor (3) and a paddle (4), wherein the sowing box (2) is fixed below the machine body (1) and loaded with pelletized coated seeds, the motor (3) is mounted on a machine arm (11) of the machine body (1), and the paddle (4) is arranged above the motor (3) and driven to rotate by the motor (3), characterized in that: A cold box (5) is arranged on the top of the machine body (1); a cooling element (6) is arranged in contact with the bottom center of the cold box (5); the top surface of the cooling element (6) is flush with the upper surface of the machine body (1); the sowing box (2) comprises a top cover (21) and a box body (22); the box body (22) comprises a cylindrical section (221), a conical section (222) and a bottom plate (223); the bottom plate (223) is provided with two symmetrically arranged through holes (224); the through holes (224) ) is connected to the lower part of the mixing tube (23), and water inlet pipes (24) are obliquely arranged on both sides of the mixing tube (23). The cooling medium in the cold box (5) is transported to the housing of the motor (3) through the pump body (51) and the first delivery pipe (52) to dissipate the heat of the motor (3). The cooling medium after absorbing the heat is transported to the water inlet pipe (24) through the second delivery pipe (53), and flows into the mixing tube (23) through the water inlet pipe (24) to spray the pelletized coated seeds.

2. A pelletized coated seed sowing drone system according to claim 1, characterized in that: The cooling element (6) is a semiconductor refrigeration sheet, the upper end (61) of which is a cold end, and the lower end (62) is a hot end.

3. A pelletized coated seed sowing drone system according to claim 2, characterized in that: A stirring shaft (25) is arranged in the box body (22), and a stirring blade (26) and a rotating plate (27) are arranged on the stirring shaft (25). The stirring blade (26) is located at the interface between the cylindrical section (221) and the conical section (222). The rotating plate (27) is a long strip plate and contacts the bottom plate (223). Driven by the stirring shaft (25), the rotating plate (27) can intermittently block the two through holes (224).

4. A pelletized coated seed sowing drone system according to claim 3, characterized in that: One end of the stirring shaft (25) passing through the bottom plate (223) is connected to a diffusion disk (28), and the diffusion disk (28) rotates along with the stirring shaft (25). The other end of the stirring shaft (25) is connected to a stirring motor (29), and the stirring motor (29) is fixed at the lower part of the top cover (21) and is located in the box body (22).

5. A pelletized coated seed sowing drone system according to claim 4, characterized in that: A fan (7) is arranged on the lower side of the semiconductor refrigeration plate, and the fan (7) includes a conical wind hood (71) and a fan blade (72). The conical wind hood (71) is arranged below the cooling element (6) at intervals, and the fan blade (72) is located in the conical wind hood (71) and can rotate forward or reverse. The fan (7) is fixed to the center of the body (1) through a bracket (73), and the air outlet (74) of the fan (7) is connected to the seed box (2) through a first air duct (75). The top cover (21) is provided with an air inlet (211) connected to the first air duct (75), and the top cover (21) is also provided with an air outlet (212).

6. A pelletized coated seed sowing drone system according to claim 5, characterized in that: The fan (7) comprises a fan shaft (76), and the stirring motor (29) is a double-shaft motor, whose lower shaft (291) is connected to the stirring shaft (25), and whose upper shaft (292) is connected to the fan shaft (76) via a gear set (293) for speed-increasing transmission.

7. A pelletized coated seed sowing drone system according to any one of claims 2 to 6, characterized in that: An annular conduit (54) is arranged in the cold box (5), the inlet end of the annular conduit (54) is connected to the outlet of the pump body (51), and a plurality of nozzles (56) passing through the side wall (55) of the cold box (5) are arranged on the annular conduit (54), the number of the nozzles (56) is consistent with the number of the motors (3), and the nozzles (56) are connected to the first delivery pipe (52).

8. The pelletized coated seed sowing drone system according to claim 7, characterized in that: The pipes of the first delivery pipe (52) and the second delivery pipe (53) are made of heat-insulating material, and the first delivery pipe (52) and the second delivery pipe (53) are detachably connected to the motor (3), the nozzle (56) and the water inlet pipe (24). The connected first delivery pipe (52) and the second delivery pipe (53) are fixed to the machine body (1) or the seed box (2) via a fixing member.

9. A pelletized coated seed sowing drone system according to claim 8, characterized in that: The mixing tube (23) and the through hole (224) are detachably connected, the angle between the axis of the water inlet pipe (24) and the mixing tube (23) is 30° to 60°, and the inner diameter of the water inlet pipe (24) gradually decreases in the direction toward the mixing tube (23).

10. The pelletized coated seed sowing drone system according to claim 1, characterized in that: A water inlet (58) is provided on the top wall (57) of the cold box (5), and the top wall (57) and the side walls (55) are coated with a heat-insulating coating or wrapped with a heat-insulating material.

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