Air pressure type seeding device and seeding control method based on constant-speed airflow

Abstract

The invention discloses an air pressure type seeding device and a seeding control method based on constant-speed airflow, and relates to the field of seeding machines. According to the air-suction type seeding mechanism, the plurality of seeding rollers for air-suction seeding are integrally arranged on the hollow shaft, when the hollow shaft rotates, the plurality of seeding rollers can be driven to synchronously rotate for air-suction seeding, and each seeding roller does not need to be independently driven, so that the air-suction type seeding mechanism is simpler in structure and more convenient to operate; meanwhile, the hollow shaft is directly communicated with the vacuumizing assembly, and the vacuumizing assembly does not need to be respectively communicated with the corresponding seeding rollers through a plurality of air guide pipes, so that the possibility of air leakage faults of the equipment is reduced, and the fault rate of the equipment is reduced; the hollow shaft is in transmission connection with a walking driving assembly of the sowing vehicle through a transmission assembly, and when the walking driving assembly drives the sowing vehicle to move forwards in the field, the walking driving assembly drives the hollow shaft and the sowing roller to synchronously rotate and sow through the transmission assembly.

Description

Technical Field

[0001] The present invention belongs to the field of seed drills, and in particular, relates to a pneumatic seed drill and a seeding control method based on uniform airflow. Background Art

[0002] Most existing seeders are equipped with outer groove wheel seeders. As the working time increases, the outer groove wheel and the retaining ring brush will wear out, making it impossible to perform precise sowing, resulting in waste of grain.

[0003] Chinese patent CN107258165B discloses a one-chamber double-row air-suction seeder, which can achieve precision sowing through air-suction sowing to prevent waste of grain, and at the same time, multiple air-suction sowing mechanisms are set up to perform synchronous sowing of multiple rows of seeds. However, in the above patent, each air-suction sowing mechanism is set up separately, resulting in a complex product structure, which increases the manufacturing cost and use cost of the equipment; at the same time, when the seeder is working, each air-suction sowing mechanism needs to be connected to the negative pressure source through an air duct, which will increase the number of air ducts used, and when any air duct fails and leaks, it will affect the air pressure stability of the entire equipment, and then affect the normal use of the equipment, thereby increasing the failure rate of the equipment. Summary of the invention

[0004] In view of the problems in the related art, the present invention proposes a pneumatic seeding device and a seeding control method based on uniform airflow to overcome the above technical problems existing in the existing related art.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a pneumatic sowing device, comprising a sowing vehicle, a travel drive assembly for driving the sowing vehicle to move is installed at the bottom end of the sowing vehicle, and a pneumatic sowing mechanism for sowing is installed at the upper end of the sowing vehicle; The pneumatic sowing mechanism comprises a seed box, a hollow shaft, a vacuum assembly, a transmission assembly and a scraping and dropping assembly, the seed box and the vacuum assembly are both fixedly mounted on the top of the sowing vehicle, the hollow shaft is rotatably mounted on the top of the sowing vehicle, a plurality of sowing rollers are fixedly mounted on the surface of the hollow shaft along the axial direction, the end of the hollow shaft is transmission-connected to the travel drive assembly through the transmission assembly, so that the travel drive assembly can drive the hollow shaft to rotate synchronously when driving the sowing vehicle to move, a plurality of air pressure adsorption holes are arranged on the circumferential surface of the sowing roller, and the vacuum assembly can provide vacuum suction to the sowing roller through the hollow shaft; A sowing groove fixedly mounted on the sowing vehicle is provided below each sowing drum, the scraping and dropping assembly is fixedly mounted on one side of the sowing groove, the top end of the scraping and dropping assembly is inclined and slidably abuts against the circumferential surface of the sowing drum, the bottom end of the scraping and dropping assembly extends to the bottom end of the sowing vehicle, the sowing groove is located at the lower side of the seed box, and the sowing groove and the seed box are connected through a feeding mechanism; The feeding mechanism comprises a feeding pipe and an intermittent sealing assembly, wherein the feeding pipe is obliquely connected and installed between the seed box and the sowing slot, and the intermittent sealing assembly can seal and isolate the feeding pipe, and the intermittent sealing assembly can intermittently open the feeding pipe during the rotation of the hollow shaft; A battery box electrically connected to the travel drive assembly and the vacuum assembly is also fixedly mounted on the top of the seeding vehicle.

[0006] Furthermore, the travel drive assembly includes a rear axle, a front axle and a motor, the rear axle is rotatably mounted on the rear side end of the bottom of the seeding vehicle, and a plurality of rollers are fixedly mounted on the rear axle; The front axle is rotatably mounted on the front side end of the bottom of the seeding vehicle, a plurality of raking wheels are fixedly mounted on the front axle, a driven wheel is also fixedly mounted on the front axle, the motor is fixedly mounted on the front end of the seeding vehicle, a driving wheel is transmission-mounted on the output shaft of the motor, and the driving wheel and the driven wheel are connected via a driving belt transmission.

[0007] Furthermore, the vacuum extraction assembly includes a vacuum pump and a rotary joint. The vacuum pump is fixedly installed on the top of the seeding vehicle. An air duct is connected to the air inlet end of the vacuum pump. One end of the air duct is connected to the interior of the hollow shaft through a rotary joint. An air duct hole connected to the seeding drum is opened on the circumferential wall of the hollow shaft.

[0008] Furthermore, the transmission assembly includes a main transmission wheel and an auxiliary transmission wheel, the main transmission wheel is fixedly installed at the end of the front axle, the auxiliary transmission wheel is fixedly installed at the end of the hollow shaft, and the main transmission wheel and the auxiliary transmission wheel are connected by a transmission belt.

[0009] Furthermore, the scraping and dropping assembly includes a sowing dropping hopper, which is fixedly installed on one side of the sowing trough, a shovel plate is fixedly installed on one side of the top of the sowing dropping hopper, and a dropping pipe extending to the bottom of the sowing vehicle is fixedly installed on the bottom of the sowing dropping hopper.

[0010] Furthermore, a shovel opening that is slidably abutted against the outer circumferential surface of the seeding drum is provided at the front end of the shovel plate, and limit baffles are provided on both sides of the shovel plate.

[0011] Furthermore, the intermittent sealing assembly includes a lifting guide groove, which is fixedly installed at the end of the feeding pipe, and a discharge port connected to the sowing groove is provided on one side of the lifting guide groove, and a sealing plate is slidably inserted inside the lifting guide groove.

[0012] Furthermore, a lifting shaft is fixedly installed on the top of the sealing plate, a top plate is fixedly installed on the top of the lifting shaft, a limiting ball head is fixedly installed on the top of the top plate, a mounting plate slidably connected with the lifting shaft is fixedly installed on the side wall of the sowing groove, and the upper end of the lifting shaft is sleeved with a pressure spring that abuts between the mounting plate and the top plate.

[0013] Furthermore, the intermittent sealing assembly also includes a limiting wheel, which is fixedly mounted on the outer ring of the hollow shaft and is located directly above the limiting ball head. The outer ring of the limiting wheel is provided with a groove, and the outer surfaces of the limiting wheel and the groove are both provided with guide grooves that are slidably engaged with the limiting ball head.

[0014] The present invention also discloses a sowing control method based on uniform airflow, the specific steps of which are: First, turn on the vacuum assembly to provide vacuum suction to the seeding drum through the hollow shaft, so that the multiple air pressure adsorption holes on the circumferential surface of the seeding drum all generate inward uniform airflow, and at the same time, the seeding vehicle is driven to move forward in the field through the travel drive assembly, and at this time, the travel drive assembly drives the hollow shaft to rotate synchronously through the transmission assembly, so that the hollow shaft drives the multiple seeding drums thereon to rotate synchronously, and when the air pressure adsorption holes on the surface of the seeding drum rotate through the bottom of the seeding groove, the air pressure adsorption holes adsorb the seeds to the surface of the seeding drum through the negative pressure suction generated by the airflow, and then the seeds make a circular motion with the rotation of the seeding drum, and when the seeds move to the position of the scraping and dropping assembly, the scraping and dropping assembly scrapes the seeds adsorbed on the surface of the seeding drum and drops them into the field ridges, thereby realizing precision seeding; while the hollow shaft rotates, it can drive the intermittent sealing assembly to open and close reciprocatingly, so that the seed box can intermittently transport additional seeds to the seeding groove through the feeding pipe.

[0015] The present invention has the following beneficial effects: 1. In the present invention, multiple seeding rollers for air suction seeding are integrated on the hollow shaft. When the hollow shaft rotates, the multiple seeding rollers can be driven to rotate synchronously for air suction seeding without driving each seeding roller separately, thereby making the structure of the air suction seeding mechanism simpler, the operation more convenient, and reducing the manufacturing cost and use cost of the equipment. At the same time, the hollow shaft is directly connected to the vacuum pumping component, and there is no need to connect the vacuum pumping component to the corresponding seeding rollers through multiple air guide pipes, thereby reducing the possibility of air leakage failure of the equipment and reducing the equipment failure rate; and the hollow shaft is connected to the travel drive component of the seeding vehicle through the transmission component. When the travel drive component drives the seeding vehicle to move forward in the field, the travel drive component drives the hollow shaft and the seeding roller to rotate synchronously for seeding through the transmission component, which not only makes the seeding driving process more convenient, but also makes the seeding speed synchronized with the walking speed of the seeding vehicle. When the walking speed of the seeding vehicle is faster, the rotation sowing speed of the seeding roller is faster, which is conducive to achieving equidistant sowing and improving the uniformity of sowing.

[0016] 2. In the present invention, when the hollow shaft drives the sowing roller to rotate for sowing, the hollow shaft can drive the intermittent sealing component to open and close reciprocally, so that the seed box can intermittently deliver additional seeds to the sowing groove through the feeding pipe. While ensuring that there is sufficient seed in the sowing groove, it prevents the seeds in the seed box from being continuously transported into the sowing groove through the feeding pipe and clogging the sowing groove, thereby affecting the normal rotation of the sowing roller and adsorption sowing, thereby ensuring that the air suction sowing process proceeds normally and stably.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, they can also obtain drawings based on these drawings without paying creative work.

[0019] Figure 1 This is one of the three-dimensional structural schematic diagrams of the pneumatic seeding device of the present invention; Figure 2 For the present invention Figure 1 A local enlarged structural schematic diagram; Figure 3 For the present invention Figure 1 A schematic diagram of the local enlarged structure at B; Figure 4 The second is a schematic diagram of the three-dimensional structure of the pneumatic seeding device of the present invention; Figure 5 For the present invention Figure 4A schematic diagram of the local enlarged structure at C; Figure 6 The third schematic diagram of the three-dimensional structure of the pneumatic seeding device of the present invention; Figure 7 The fourth is a schematic diagram of the three-dimensional structure of the pneumatic seeding device of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the local enlarged structure at D; Fig. 9 The fifth schematic diagram of the three-dimensional structure of the pneumatic seeding device of the present invention; Fig.10 For the present invention Fig. 9 Schematic diagram of the local enlarged structure at E.

[0020] In the figure: 1. sowing vehicle; 11. rear axle; 12. roller; 13. front axle; 14. harrow wheel; 15. motor; 16. driving wheel; 17. driving belt; 18. driven wheel; 2. pneumatic sowing mechanism; 21. seed box; 22. hollow shaft; 23. vacuum pump; 24. rotary joint; 25. air guide tube; 26. sowing trough; 27. sowing drum; 28. air pressure adsorption hole; 29. ​​shovel plate; 210. sowing hopper; 211. Main transmission wheel; 212. Transmission belt; 213. Auxiliary transmission wheel; 214. Dropping pipe; 215. Air guide hole; 216. Shovel mouth; 3. Feeding mechanism; 31. Feeding pipe; 32. Lifting guide groove; 33. Discharging port; 34. Limiting ball head; 35. Limiting wheel; 36. Groove; 37. Guide groove; 38. Sealing plate; 39. Lifting shaft; 310. Mounting plate; 311. Pressure spring; 312. Top plate; 4. Battery box. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0022] In the description of the present invention, it is necessary to understand that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention. Embodiment 1

[0023] See also Figure 1-Figure 5As shown, the present invention is a pneumatic seeding device, including a seeding vehicle 1, a travel drive assembly for driving the seeding vehicle 1 to move is installed at the bottom end of the seeding vehicle 1, and a pneumatic seeding mechanism 2 for seeding is installed at the upper end of the seeding vehicle 1; the pneumatic seeding mechanism 2 includes a seed box 21, a hollow shaft 22, a vacuum assembly, a transmission assembly and a scraping and dropping assembly, the seed box 21 and the vacuum assembly are both fixedly installed on the top of the seeding vehicle 1, the hollow shaft 22 is rotatably installed on the top of the seeding vehicle 1, a plurality of seeding rollers 27 are fixedly installed on the surface of the hollow shaft 22 along the axial direction, the end of the hollow shaft 22 is connected to the travel drive assembly through the transmission assembly, so that the travel drive assembly can drive the hollow shaft 22 to rotate synchronously when driving the seeding vehicle 1 to move, a plurality of air pressure adsorption holes 28 are arranged on the circumferential surface of the seeding roller 27, and the vacuum assembly can apply air to the seeding roller through the hollow shaft 22 27 provides vacuum suction; each sowing roller 27 is provided with a sowing groove 26 fixedly installed on the sowing vehicle 1 below, and a scraping and dropping assembly is fixedly installed on one side of the sowing groove 26, and the top of the scraping and dropping assembly is tilted and slidably abutted against the circumferential surface of the sowing roller 27, and the bottom end of the scraping and dropping assembly extends to the bottom end of the sowing vehicle 1, and the sowing groove 26 is located at the lower side of the seed box 21, and the sowing groove 26 is connected to the seed box 21 through the feeding mechanism 3; the feeding mechanism 3 includes a feeding pipe 31 and an intermittent sealing assembly, the feeding pipe 31 is obliquely connected and installed between the seed box 21 and the sowing groove 26, the intermittent sealing assembly can seal and isolate the feeding pipe 31, and the intermittent sealing assembly can intermittently open the feeding pipe 31 during the rotation of the hollow shaft 22; the top of the sowing vehicle 1 is also fixedly installed with a battery box 4 electrically connected to the travel drive assembly and the vacuum assembly; When the pneumatic seeding device is used, the vacuum pumping assembly is first turned on to provide vacuum suction to the seeding drum 27 through the hollow shaft 22, so that the multiple air pressure adsorption holes 28 on the circumferential surface of the seeding drum 27 all generate uniform airflow inwards, and at the same time, the seeding vehicle 1 is driven to move forward in the field through the travel drive assembly, and at this time, the travel drive assembly drives the hollow shaft 22 to rotate synchronously through the transmission assembly, so that the hollow shaft 22 drives the multiple seeding drums 27 thereon to rotate synchronously, and when the air pressure adsorption holes 28 on the surface of the seeding drum 27 rotate through the seeding drum When the seeds are inside the sowing groove 26, the air pressure adsorption hole 28 adsorbs and fixes the seeds inside the sowing groove 26 to the surface of the sowing roller 27 through the negative pressure suction force generated by the airflow, and then the seeds make a circular motion with the rotation of the sowing roller 27. When the seeds move to the position of the scraping and dropping assembly, the scraping and dropping assembly scrapes the seeds adsorbed on the surface of the sowing roller 27 and drops them into the field ridge, thereby realizing precision sowing; while the hollow shaft 22 rotates, it can drive the intermittent sealing assembly to reciprocately open and close, so that the seed box 21 intermittently delivers supplementary seeds to the sowing groove 26 through the feeding pipe 31; In this embodiment, multiple seeding rollers 27 for air suction seeding are integrated on the hollow shaft 22. When the hollow shaft 22 rotates, it can drive the multiple seeding rollers 27 to rotate synchronously for air suction seeding without driving each seeding roller 27 separately, thereby making the structure of the air suction seeding mechanism simpler and the operation more convenient, reducing the manufacturing cost and use cost of the equipment. At the same time, the hollow shaft 22 is directly connected to the vacuum pumping component, and there is no need to connect the vacuum pumping component to the corresponding seeding rollers 27 through multiple conduits, thereby reducing the possibility of air leakage failure in the equipment and reducing the equipment failure rate; and the hollow shaft 22 is connected to the travel drive component of the seeding vehicle 1 through the transmission component. When the travel drive component drives the seeding vehicle 1 to move forward in the field, the travel drive component The transmission assembly drives the hollow shaft 22 and the seeding roller 27 to rotate synchronously for seeding, which not only makes the seeding driving process more convenient, but also makes the seeding speed synchronized with the walking speed of the seeding vehicle 1. When the walking speed of the seeding vehicle 1 is faster, the rotation sowing speed of the seeding roller 27 is faster, which is conducive to achieving equidistant sowing and improving the uniformity of sowing; through the reciprocating opening and closing of the intermittent sealing assembly, the seed box 21 can intermittently transport additional seeds to the sowing groove 26 through the feeding pipe 31, while ensuring that the seed amount in the sowing groove 26 is sufficient, it prevents the seeds in the seed box 21 from being continuously transported into the sowing groove 26 through the feeding pipe 31 and clogging the sowing groove 26, thereby affecting the normal rotation of the sowing roller 27 and adsorption sowing, thereby ensuring that the air suction sowing process is carried out normally and stably. Embodiment 2

[0024] See also Figure 1 , Figure 2 As shown, the difference between this embodiment and the above embodiment is that the travel drive assembly includes a rear axle 11, a front axle 13 and a motor 15, the rear axle 11 is rotatably mounted on the rear side end of the bottom of the seeding vehicle 1, and a plurality of rollers 12 are fixedly mounted on the rear axle 11; the front axle 13 is rotatably mounted on the front side end of the bottom of the seeding vehicle 1, and a plurality of harrowing wheels 14 are fixedly mounted on the front axle 13, and a driven wheel 18 is also fixedly mounted on the front axle 13, the motor 15 is fixedly mounted on the front end of the seeding vehicle 1, and a driving wheel 16 is transmission-mounted on the output shaft of the motor 15, and the driving wheel 16 and the driven wheel 18 are transmission-connected through a driving belt 17; During sowing, the motor 15 drives the driving wheel 16 to rotate, and the driving wheel 16 drives the driven wheel 18 to rotate through the transmission of the driving belt 17, so that the driven wheel 18 drives the front axle 13 and the harrowing wheel 14 to rotate, so as to drive the sowing vehicle 1 to move forward through the rotating harrowing wheel 14, and at the same time, the rear axle 11 and the roller 12 at the rear end cooperate to provide rolling support for the sowing vehicle 1, so as to facilitate the movement of the sowing vehicle 1; with the harrowing wheel 14 as the driving front wheel, the harrowing wheel 14 can not only adapt to the complex terrain in the field, so that the sowing vehicle 1 can move forward smoothly in the field, but also has a certain loosening effect in the process of rotating and moving forward, and can transport the soil to facilitate the subsequent sowing process. Embodiment 3

[0025] See also Figure 1 , Figure 3 , Figure 6-Figure 8 As shown, the difference between this embodiment and the above embodiment is that the vacuum assembly includes a vacuum pump 23 and a rotary joint 24, the vacuum pump 23 is fixedly installed on the top of the seeding vehicle 1, and the air inlet end of the vacuum pump 23 is connected to an air guide pipe 25, one end of the air guide pipe 25 is connected to the inside of the hollow shaft 22 through the rotary joint 24, and an air guide hole 215 connected to the seeding drum 27 is opened on the circumferential wall of the hollow shaft 22; the transmission assembly includes a main transmission wheel 211 and an auxiliary transmission wheel 213, the main transmission wheel 211 is fixedly installed at the end of the front axle 13, and the auxiliary transmission wheel 213 is fixedly installed It is installed at the end of the hollow shaft 22, and the main transmission wheel 211 and the auxiliary transmission wheel 213 are connected by a transmission belt 212; the scraping and dropping assembly includes a sowing dropping hopper 210, which is fixedly installed on one side of the sowing groove 26, and a shovel plate 29 is fixedly installed on one side of the top of the sowing dropping hopper 210. A dropping pipe 214 extending to the bottom of the sowing vehicle 1 is fixedly installed at the bottom of the sowing dropping hopper 210; the front end of the shovel plate 29 is provided with a shovel mouth 216 that slides against the outer circumferential surface of the sowing roller 27, and limit baffles are provided on both sides of the shovel plate 29.

[0026] When the front axle 13 rotates, it drives the main transmission wheel 211 to rotate synchronously, and then the main transmission wheel 211 drives the auxiliary transmission wheel 213 to rotate synchronously through the transmission belt 212, thereby driving the hollow shaft 22 and the sowing drum 27 to rotate, and at the same time, the vacuum pump 23 is turned on to make the vacuum pump 23 evacuate the sowing drum 27 through the air guide pipe 25, the rotary joint 24, and the air guide hole 215, so as to generate a negative pressure airflow in the air pressure adsorption hole 28. When the air pressure adsorption hole 28 rotates into the sowing groove 26 and contacts the seeds in the sowing groove 26, the air pressure adsorption The hole 28 absorbs and fixes the seeds through negative pressure suction, and then as the sowing drum 27 continues to rotate, the sowing drum 27 drives the absorbed and fixed seeds to do circular motion. When the seeds move to above the shovel plate 29, the shovel plate 29 shovels the seeds from the surface of the sowing drum 27 through the shovel mouth 216, and the shoveled seeds slide along the shovel plate 29 under the action of rotating centrifugal force and gravity and fall into the sowing hopper 210, and then fall into the field through the drop pipe 214, completing the sowing. In this reciprocating manner, precision sowing can be continuously performed when the sowing vehicle 1 moves forward. Embodiment 4

[0027] See also Figure 4 , Figure 5 , Fig. 9 , Fig.10 As shown, the difference between this embodiment and the above embodiment is that the intermittent sealing assembly includes a lifting guide groove 32, which is fixedly installed at the end of the feeding pipe 31, and a discharge port 33 connected to the sowing groove 26 is provided on one side of the lifting guide groove 32, and a sealing plate 38 is slidably inserted inside the lifting guide groove 32; a lifting shaft 39 is fixedly installed on the top of the sealing plate 38, and a top plate 312 is fixedly installed on the top of the lifting shaft 39, and a limiting ball head 34 is fixedly installed on the top of the top plate 312, and the sowing groove 26 is fixedly installed on the top of the lifting shaft 39. A mounting plate 310 is fixedly mounted on the side wall of the hollow shaft 22 and is slidably plugged with the lifting shaft 39. The upper end of the lifting shaft 39 is sleeved with a pressure spring 311 that abuts between the mounting plate 310 and the top plate 312. The intermittent sealing assembly also includes a limiting wheel 35, which is fixedly mounted on the outer ring of the hollow shaft 22 and is located directly above the limiting ball head 34. The outer ring of the limiting wheel 35 is provided with a groove 36. The outer surfaces of the limiting wheel 35 and the groove 36 are both provided with a guide groove 37 that is slidably engaged with the limiting ball head 34. The limiting wheel 35 limits the limiting ball head 34 downwardly through the guide groove 37. At this time, the sealing plate 38 is located at the bottom end of the lifting guide groove 32 under the abutment of the limiting wheel 35 and the limiting ball head 34, thereby sealing and isolating the feeding tube 31 and the sowing groove 26 to prevent the seeds in the seed box 21 from being continuously transported to the sowing groove 26 through the feeding tube 31; and when the hollow shaft 22 rotates for sowing, the hollow shaft 22 drives the limiting wheel 35 to rotate synchronously. When the groove 36 on the limiting wheel 35 rotates to face the limiting ball head 34, the limiting ball head 34 and the top plate 312 can move upward under the elastic force of the pressure spring 311 until the limiting ball head 34 abuts against the outer surface of the groove 36. At the same time, the top plate 312 drives the lifting shaft 39 and the sealing plate 38 to move upward. The seeds in the feeding tube 31 are transported to the sowing groove 26 through the lifting guide groove 32 and the discharge port 33, thereby replenishing the seeds in the sowing groove 26. After that, with the continuous rotation of the hollow shaft 22 and the limiting wheel 35, when the groove 36 and the limiting ball head 34 rotate out of alignment, the limiting ball head 34 moves downward and resets under the contact of the outer ring of the limiting wheel 35, thereby driving the top plate 312, the lifting shaft 39 and the sealing plate 38 to reset downward, so that the sealing plate 38 seals and isolates the lifting guide groove 32 again. In this reciprocating manner, the seeds in the sowing groove 26 can be intermittently replenished during the sowing process, so that the seeds in the sowing groove 26 are always in an appropriate amount, thereby facilitating the sowing roller 27 to aspirate seeds from the sowing groove 26. Embodiment 5

[0028] This embodiment discloses a sowing control method based on uniform airflow, and the specific steps are as follows: First, the vacuum assembly is turned on to provide vacuum suction to the seeding drum 27 through the hollow shaft 22, so that the multiple air pressure adsorption holes 28 on the circumferential surface of the seeding drum 27 all generate uniform airflow inwards, and at the same time, the seeding vehicle 1 is driven to move forward in the field through the travel drive assembly, and at this time, the travel drive assembly drives the hollow shaft 22 to rotate synchronously through the transmission assembly, so that the hollow shaft 22 drives the multiple seeding drums 27 thereon to rotate synchronously, and when the air pressure adsorption holes 28 on the surface of the seeding drum 27 rotate and pass the bottom of the seeding groove 26, the air pressure The adsorption holes 28 adsorb and fix the seeds on the surface of the sowing drum 27 through the negative pressure suction force generated by the airflow. Then, the seeds make a circular motion with the rotation of the sowing drum 27. When the seeds move to the position of the scraping and dropping assembly, the scraping and dropping assembly scrapes the seeds adsorbed on the surface of the sowing drum 27 and drops them into the field ridges, thereby realizing precision sowing. While the hollow shaft 22 rotates, it can drive the intermittent sealing assembly to open and close reciprocally, so that the seed box 21 intermittently delivers additional seeds to the sowing trough 26 through the feeding pipe 31, so that the seed quantity in the sowing trough 26 is sufficient.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0030] The preferred embodiments of the invention disclosed above are only used to help explain the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can understand and use the invention well.

Claims

1. A pneumatic seeding device, comprising a seeding vehicle, characterized in that: A travel drive assembly for driving the sowing vehicle to move is installed at the bottom end of the sowing vehicle, and a pneumatic sowing mechanism for sowing is installed at the upper end of the sowing vehicle; The pneumatic sowing mechanism comprises a seed box, a hollow shaft, a vacuum assembly, a transmission assembly and a scraping and dropping assembly, the seed box and the vacuum assembly are both fixedly mounted on the top of the sowing vehicle, the hollow shaft is rotatably mounted on the top of the sowing vehicle, a plurality of sowing rollers are fixedly mounted on the surface of the hollow shaft along the axial direction, the end of the hollow shaft is transmission-connected to the travel drive assembly through the transmission assembly, so that the travel drive assembly can drive the hollow shaft to rotate synchronously when driving the sowing vehicle to move, a plurality of air pressure adsorption holes are arranged on the circumferential surface of the sowing roller, and the vacuum assembly can provide vacuum suction to the sowing roller through the hollow shaft; A sowing groove fixedly mounted on the sowing vehicle is provided below each sowing drum, the scraping and dropping assembly is fixedly mounted on one side of the sowing groove, the top end of the scraping and dropping assembly is inclined and slidably abuts against the circumferential surface of the sowing drum, the bottom end of the scraping and dropping assembly extends to the bottom end of the sowing vehicle, the sowing groove is located at the lower side of the seed box, and the sowing groove and the seed box are connected through a feeding mechanism; The feeding mechanism comprises a feeding pipe and an intermittent sealing assembly, wherein the feeding pipe is obliquely connected and installed between the seed box and the sowing slot, and the intermittent sealing assembly can seal and isolate the feeding pipe, and the intermittent sealing assembly can intermittently open the feeding pipe during the rotation of the hollow shaft; A battery box electrically connected to the travel drive assembly and the vacuum assembly is also fixedly mounted on the top of the seeding vehicle.

2. A pneumatic seeding device according to claim 1, characterized in that: The travel drive assembly includes a rear axle, a front axle and a motor, the rear axle is rotatably mounted on the rear side end of the bottom of the seeding vehicle, and a plurality of rollers are fixedly mounted on the rear axle; The front axle is rotatably mounted on the front side end of the bottom of the seeding vehicle, a plurality of raking wheels are fixedly mounted on the front axle, a driven wheel is also fixedly mounted on the front axle, the motor is fixedly mounted on the front end of the seeding vehicle, a driving wheel is transmission-mounted on the output shaft of the motor, and the driving wheel and the driven wheel are connected via a driving belt transmission.

3. A pneumatic seeding device according to claim 1, characterized in that: The vacuum assembly includes a vacuum pump and a rotary joint. The vacuum pump is fixedly installed on the top of the seeding vehicle. An air duct is connected to the air inlet end of the vacuum pump. One end of the air duct is connected to the interior of the hollow shaft through a rotary joint. An air duct hole connected to the seeding drum is opened on the circumferential wall of the hollow shaft.

4. A pneumatic seeding device according to claim 2, characterized in that: The transmission assembly includes a main transmission wheel and an auxiliary transmission wheel. The main transmission wheel is fixedly installed on the end of the front axle, and the auxiliary transmission wheel is fixedly installed on the end of the hollow shaft. The main transmission wheel and the auxiliary transmission wheel are connected by a transmission belt.

5. The pneumatic seeding device according to claim 1, characterized in that: The scraping and dropping assembly includes a sowing dropping hopper, which is fixedly installed on one side of the sowing trough, a shovel plate arranged obliquely is fixedly installed on one side of the top of the sowing dropping hopper, and a dropping pipe extending to the bottom of the sowing vehicle is fixedly installed on the bottom end of the sowing dropping hopper.

6. A pneumatic seeding device according to claim 5, characterized in that: The front end of the shovel plate is provided with a shovel opening which is slidably abutted against the outer circumferential surface of the seeding drum, and both sides of the shovel plate are provided with limit baffles.

7. The pneumatic seeding device according to claim 1, characterized in that: The intermittent sealing assembly includes a lifting guide groove, which is fixedly installed at the end of the feeding pipe, and a discharge port connected to the sowing groove is arranged on one side of the lifting guide groove, and a sealing plate is slidably inserted inside the lifting guide groove.

8. A pneumatic seeding device according to claim 7, characterized in that: A lifting shaft is fixedly installed on the top of the sealing plate, a top plate is fixedly installed on the top of the lifting shaft, a limiting ball head is fixedly installed on the top of the top plate, a mounting plate slidably connected with the lifting shaft is fixedly installed on the side wall of the sowing groove, and the upper end of the lifting shaft is sleeved with a pressure spring abutting between the mounting plate and the top plate.

9. A pneumatic seeding device according to claim 8, characterized in that: The intermittent sealing assembly also includes a limiting wheel, which is fixedly mounted on the outer ring of the hollow shaft and is located directly above the limiting ball head. The outer ring of the limiting wheel is provided with a groove, and the outer surfaces of the limiting wheel and the groove are both provided with guide grooves that are slidably engaged with the limiting ball head.

10. A sowing control method based on uniform airflow, using the pneumatic sowing device according to any one of claims 1 to 9, characterized in that: The specific steps are: First, turn on the vacuum assembly to provide vacuum suction to the seeding drum through the hollow shaft, so that the multiple air pressure adsorption holes on the circumferential surface of the seeding drum all generate inward uniform airflow, and at the same time, the seeding vehicle is driven to move forward in the field through the travel drive assembly, and at this time, the travel drive assembly drives the hollow shaft to rotate synchronously through the transmission assembly, so that the hollow shaft drives the multiple seeding drums thereon to rotate synchronously, and when the air pressure adsorption holes on the surface of the seeding drum rotate through the bottom of the seeding groove, the air pressure adsorption holes adsorb the seeds to the surface of the seeding drum through the negative pressure suction generated by the airflow, and then the seeds make a circular motion with the rotation of the seeding drum, and when the seeds move to the position of the scraping and dropping assembly, the scraping and dropping assembly scrapes the seeds adsorbed on the surface of the seeding drum and drops them into the field ridges, thereby realizing precision seeding; while the hollow shaft rotates, it can drive the intermittent sealing assembly to open and close reciprocatingly, so that the seed box can intermittently transport additional seeds to the seeding groove through the feeding pipe.

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