Air suction seeder single fan positive and negative pressure dual-acting airflow stabilization supply device

Abstract

This invention relates to the field of agricultural machinery technology, and provides a single-fan, dual-action positive and negative pressure airflow stabilization supply device for an air-suction seeder. The air-suction seeder includes an air-suction seed metering device and a seed guide tube, with the air-suction seed metering device connected to the seed guide tube. The airflow stabilization supply device includes a fan, a negative pressure seed filling mechanism, and a positive pressure seed conveying mechanism. The fan includes a negative pressure air inlet and a positive pressure air outlet. One end of the negative pressure seed filling mechanism is connected to the negative pressure air inlet, and the other end is connected to the air outlet of the air-suction seed metering device. One end of the positive pressure seed conveying mechanism is connected to the positive pressure air outlet, and the other end is connected to the seed guide tube. The fan provides air pressure for the negative pressure seed filling mechanism and the positive pressure seed conveying mechanism. The negative pressure seed filling mechanism fills the air-suction seed metering device with negative pressure, and the positive pressure seed conveying mechanism conveys the seeds entering the seed guide tube with positive pressure. This invention achieves both negative pressure seed filling and positive pressure seed conveying functions with a single fan. The device has a simple structure, low cost, and improves the accuracy and efficiency of sowing.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, and in particular to a stable airflow supply device for a single-fan positive and negative pressure dual-action airflow of a pneumatic seeder. Background Technology

[0002] In the field of air-suction seeders, the airflow supply device plays a crucial role. As the power source for seed transport, it directly affects the accuracy and efficiency of sowing. Currently, mainstream airflow supply systems on the market are mainly designed to provide a stable airflow supply to the seed metering device to ensure that seeds can be accurately and orderly discharged to the predetermined position. However, this design concept mainly focuses on the airflow requirements during the seed metering stage of seed transport, while the air pressure requirements during the seed filling stage of feeding seeds into the seed metering device are not adequately considered.

[0003] Specifically, existing airflow supply devices are typically configured only to meet the air pressure requirements of the seed metering device, providing the necessary air pressure during seed dispensing. However, during the seed transfer from the seed box to the seed metering device, i.e., the seed filling stage, existing devices do not provide sufficient air pressure support. This may lead to insufficient stability of the seeds during transport (especially during the seed filling stage), thus affecting the accuracy and uniformity of sowing. In addition, the air pressure stabilization mechanisms in existing airflow supply devices are often complex in structure, which not only increases manufacturing costs but may also introduce potential failure points due to the excessive number of mechanical parts, reducing the reliability and durability of the system.

[0004] Therefore, how to design an airflow supply device that can provide stable air pressure during seed transport has become a technical problem that urgently needs to be solved in the field of air suction seeders. Summary of the Invention

[0005] This invention provides a single-fan positive and negative pressure dual-action airflow stabilization supply device for a pneumatic seeder. It aims to achieve both negative pressure seed filling and positive pressure seed delivery functions with a single fan, thereby simplifying the device structure, reducing costs, and improving the accuracy and efficiency of seeding.

[0006] This invention provides a single-fan positive and negative pressure dual-action airflow stabilization supply device for a pneumatic seeder. The pneumatic seeder includes a pneumatic seed metering device and a seed guide tube. The seed discharge port of the pneumatic seed metering device is connected to the seed inlet of the seed guide tube. The airflow stabilization supply device includes a fan, a negative pressure seed filling mechanism, and a positive pressure seed conveying mechanism.

[0007] The fan includes a negative pressure air inlet and a positive pressure air outlet. One end of the negative pressure seed filling mechanism is connected to the negative pressure air inlet, and the other end of the negative pressure seed filling mechanism is connected to the air outlet of the air suction seed meter. One end of the positive pressure seed conveying mechanism is connected to the positive pressure air outlet, and the other end of the positive pressure seed conveying mechanism is connected to the seed guide tube.

[0008] The fan is used to provide air pressure for the negative pressure seed filling mechanism and the positive pressure seed conveying mechanism. The negative pressure seed filling mechanism fills the air suction seed meter with seeds through negative pressure, and the positive pressure seed conveying mechanism conveys the seeds entering the seed guide tube through positive pressure.

[0009] According to the air suction seeder single fan positive and negative pressure dual-action airflow stabilization supply device provided by the present invention, the negative pressure seed filling mechanism includes an air suction pipe, a negative pressure distributor and a negative pressure air duct. One end of the air suction pipe is connected to the negative pressure air inlet, and the other end of the air suction pipe is connected to the air outlet of the negative pressure distributor. One end of the negative pressure air duct is connected to the air outlet of the air suction seed metering device, and the other end of the negative pressure air duct is connected to the air inlet of the negative pressure distributor.

[0010] According to the air suction seeder single fan positive and negative pressure dual-action airflow stabilization supply device provided by the present invention, the negative pressure distributor is provided with a plurality of air inlets spaced apart along its axial direction, and a plurality of negative pressure air pipes are connected one-to-one with the plurality of air inlets of the negative pressure distributor, and each negative pressure air pipe is connected to a corresponding air suction seed metering device.

[0011] According to the air-suction seeder single-fan positive and negative pressure dual-action airflow stabilization supply device provided by the present invention, the positive pressure seed conveying mechanism includes an air blowing pipe, a positive pressure distributor, and a positive pressure air duct. One end of the air blowing pipe is connected to the positive pressure air outlet, and the other end of the air blowing pipe is connected to the air inlet of the positive pressure distributor. One end of the positive pressure air duct is connected to the air inlet of the seed guide pipe, and the other end of the positive pressure air duct is connected to the air outlet of the positive pressure distributor.

[0012] According to the air suction seeder single fan positive and negative pressure dual-action airflow stabilization supply device provided by the present invention, the positive pressure distributor is provided with a plurality of air outlets spaced apart along its axial direction, and a plurality of positive pressure air pipes are connected one-to-one with the plurality of air outlets of the positive pressure distributor, and each positive pressure air pipe is connected to a seed guide pipe.

[0013] The air-suction seeder single-fan positive and negative pressure dual-action airflow stabilization supply device provided by the present invention further includes two pressure regulators, which are respectively connected to the negative pressure distributor and the positive pressure distributor, and are used to adjust the air pressure in the negative pressure distributor and the positive pressure distributor respectively.

[0014] According to the air-suction seeder single-fan positive and negative pressure dual-acting airflow stabilization supply device provided by the present invention, the pressure regulator includes a pressure regulating plate, a pressure relief pipe, and a pressure regulating component. The pressure regulating plate is hinged to the pressure relief pipe via a rotating shaft. The pressure regulating component is disposed on the outer wall of the pressure relief pipe, and one end of the pressure regulating component is connected to the pressure regulating plate. The pressure regulating component is used to apply a pulling force to the pressure regulating plate. When the air pressure in the negative pressure distributor or the positive pressure distributor is greater than the pulling force on the pressure regulating plate, the pressure regulating plate rotates to open the pressure regulator, thereby achieving pressure stabilization.

[0015] According to the air suction seeder single fan positive and negative pressure dual-acting airflow stabilization supply device provided by the present invention, the pressure stabilizing plate includes a pressure stabilizing plate body, a first rotating shaft, a second rotating shaft and an adjusting plate ear, the diameter of the pressure stabilizing plate body is adapted to the inner diameter of the pressure relief pipe, the first rotating shaft and the second rotating shaft are respectively fixed to opposite ends of the pressure stabilizing plate body, and the adjusting plate ear is fixed to the end of the second rotating shaft away from the pressure stabilizing plate body;

[0016] The pressure relief pipe has two opposite mounting holes that penetrate the pipe wall. The main body of the pressure stabilizing plate is hinged to the inside of the pressure relief pipe via the first rotating shaft and the second rotating shaft. The adjusting plate lug is located on the outside of the pressure relief pipe via the second rotating shaft.

[0017] According to the air-suction seeder single-fan positive and negative pressure dual-acting airflow stabilization supply device provided by the present invention, the pressure regulating component includes an adjusting spring, a pressure regulating screw, an adjusting reference plate, and an adjusting bolt;

[0018] The adjusting reference plate is fixed to the outer wall of the pressure relief pipe. One end of the adjusting spring is fixedly connected to the adjusting plate lug, and the other end of the adjusting spring is fixedly connected to the unthreaded end of the pressure adjusting screw. The pressure adjusting screw passes through the adjusting reference plate, and the threaded end of the pressure adjusting screw is threadedly connected to the adjusting bolt. By rotating the adjusting bolt, the tension of the adjusting spring is adjusted, thereby adjusting the air pressure to open the pressure stabilizing adjusting plate.

[0019] The air-suction seeder single-fan positive and negative pressure dual-acting airflow stabilization supply device provided by the present invention further includes a fan transmission mechanism and an air outlet receiver.

[0020] The fan transmission mechanism is fixedly connected to the rotating shaft of the fan, and the fan transmission mechanism is used to drive the fan to rotate; the air outlet receiver is disposed on the positive pressure air outlet, and the positive pressure seed conveying mechanism is connected to the positive pressure air outlet of the fan through the air outlet receiver.

[0021] The above-described technical solution of the present invention has the following beneficial effects:

[0022] This invention relates to a single-fan, positive and negative pressure dual-action airflow stabilization supply device for a pneumatic seeder. This device achieves two key functions—negative pressure seed filling and positive pressure seed delivery—using a single fan. This design not only simplifies the overall structure of the airflow supply device but also significantly reduces manufacturing costs. Compared to traditional designs that require multiple fans or complex air pressure stabilization mechanisms, this invention's device is more compact, efficient, and easier to maintain and operate. During the negative pressure seed filling stage, negative pressure effectively adsorbs seeds, ensuring they are stably and orderly delivered into the pneumatic seed metering device. During the positive pressure seed delivery stage, positive pressure stably transports the seeds entering the seed guide tube, preventing seed scattering or blockage during transport, thereby greatly improving the accuracy and uniformity of sowing. In addition, the present invention uses a single fan to provide air pressure, which reduces the air pressure fluctuations and instability that may be caused by multiple fans working together; at the same time, the dual positive and negative pressure design enables the airflow to remain continuous and stable during the seed filling and seed transport processes, and allows the two processes of negative pressure seed filling and positive pressure seed transport to be efficiently connected, further enhancing the stability and reliability of the entire sowing system, reducing the waiting time and energy consumption of seeds during the sowing process, and improving sowing efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the air suction seeder single fan positive and negative pressure dual-acting airflow stabilization supply device provided in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the fan in the airflow stabilization supply device shown;

[0026] Figure 3 for Figure 1 A schematic diagram of the negative pressure distributor and positive pressure distributor of the airflow stabilization supply device shown in the figure;

[0027] Figure 4 for Figure 1 A schematic diagram of the voltage regulator of the airflow stabilization supply device shown;

[0028] Figure 5 for Figure 4 A schematic diagram of the voltage regulator plate shown in the figure;

[0029] Figure 6for Figure 4 The diagram shows the structure of the pressure relief pipe of the voltage regulator.

[0030] Figure label:

[0031] 1. Fan drive mechanism; 2. Fan; 3. Intake pipe; 4. Negative pressure distributor; 5. Voltage stabilizer; 6. Air suction seed metering device; 7. Negative pressure duct; 8. Seed pressing wheel; 9. Seed guide pipe; 10. Positive pressure duct; 11. Positive pressure distributor; 12. Air blowing pipe; 13. Outlet receiver; 201. Negative pressure inlet; 202. Positive pressure outlet; 401. Negative pressure distributor outlet; 402. Negative pressure distributor inlet; 1101. Positive pressure distributor inlet 1102, Positive pressure distributor outlet; 501, Pressure stabilizing plate; 502, Pressure relief pipe; 503, Adjusting spring; 504, Pressure adjusting screw; 505, Adjusting reference plate; 506, Adjusting bolt; 50101, First rotating shaft; 50102, Pressure stabilizing plate body; 50103, Second rotating shaft; 50104, Adjusting plate lug; 50201, First mounting hole; 50202, Pressure relief pipe channel; 50203, Second mounting hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] Please see Figure 1 This invention provides a single-fan, positive and negative pressure dual-action airflow stabilization supply device for an air-suction seeder. This device provides a stable airflow for the air-suction seeder. The air-suction seeder includes an air-suction seed metering device 6 and a seed guide tube 9. The seed outlet of the air-suction seed metering device 6 is connected to the seed inlet of the seed guide tube 9, and the seeds entering the air-suction seed metering device 6 are discharged through the seed outlet of the seed guide tube 9. The airflow stabilization supply device of this invention includes a fan 2, a negative pressure seed filling mechanism, and a positive pressure seed conveying mechanism.

[0034] Combination Figure 1 and Figure 2As shown, the blower 2 includes a negative pressure air inlet 201 and a positive pressure air outlet 202. One end of the negative pressure seed filling mechanism is connected to the negative pressure air inlet 201, and the other end is connected to the air outlet of the air suction seed metering device 6. One end of the positive pressure seed conveying mechanism is connected to the positive pressure air outlet 202, and the other end is connected to the seed guide tube 9. The blower 2 provides air pressure for both the negative pressure seed filling mechanism and the positive pressure seed conveying mechanism. The negative pressure seed filling mechanism fills the air suction seed metering device 6 with seeds using negative pressure, and the positive pressure seed conveying mechanism conveys the seeds entering the seed guide tube 9 using positive pressure.

[0035] Specifically, the negative pressure seed filling mechanism includes an air intake pipe 3, a negative pressure distributor 4, and a negative pressure air duct 7. One end of the air intake pipe 3 is connected to the negative pressure air inlet 201, and the other end of the air intake pipe 3 is connected to the air outlet of the negative pressure distributor 4. One end of the negative pressure air duct 7 is connected to the air outlet of the air suction seed meter 6, and the other end of the negative pressure air duct 7 is connected to the air inlet of the negative pressure distributor 4.

[0036] The positive pressure seed delivery mechanism includes an air blowing pipe 12, a positive pressure distributor 11, and a positive pressure air duct 10. One end of the air blowing pipe 12 is connected to the positive pressure air outlet 202, and the other end of the air blowing pipe 12 is connected to the air inlet of the positive pressure distributor 11. One end of the positive pressure air duct 10 is connected to the air inlet of the seed guide pipe 9, and the other end of the positive pressure air duct 10 is connected to the air outlet of the positive pressure distributor 11.

[0037] Among them, the airflow direction of the airflow stabilization supply device is as follows: Figure 1 As indicated by the arrows, during the rotation of fan 2, fan 2 draws air in from the outlet of air suction seed meter 6 through the negative pressure seed filling mechanism, creating negative pressure within the mechanism and simultaneously forming a negative pressure airflow along the seed filling path. During the filling stage, the seeds are stably and orderly drawn into the air suction seed meter 6 by the negative pressure of the filling mechanism, achieving stable and accurate filling and preventing missed filling. The air drawn into fan 2 is discharged through the inlet of seed guide tube 9 by the positive pressure seed conveying mechanism, creating positive pressure within the mechanism and simultaneously forming a positive pressure airflow along the seed discharging (transporting) path. During the seed conveying stage, the seeds are stably and orderly discharged from the outlet of seed guide tube 9 by the positive pressure of the conveying mechanism, achieving stable and accurate seed discharging. The positive and negative pressure dual-action design of this invention enables the airflow to remain continuous and stable during the seed filling and transporting processes, allowing the two processes of negative pressure seed filling and positive pressure seed transport to be efficiently connected. This enhances the stability and reliability of the entire sowing system, reduces seed waiting time and energy consumption during the sowing process, and improves sowing efficiency.

[0038] like Figure 3As shown, the negative pressure distributor 4 includes a negative pressure distributor outlet 401 and multiple negative pressure distributor inlets 402. The negative pressure distributor outlet 401 and negative pressure distributor inlets 402 are respectively located on opposite sides of the negative pressure distributor 4. The multiple negative pressure distributor inlets 402 are distributed at intervals along the axial direction of the negative pressure distributor 4. The negative pressure distributor outlet 401 is located in the middle of the negative pressure distributor 4. Multiple negative pressure air ducts 7 are connected to the multiple negative pressure distributor inlets 402 in a one-to-one correspondence. Each negative pressure air duct 7 is connected to a corresponding air suction seed metering device 6.

[0039] The positive pressure distributor 11 includes a positive pressure distributor inlet 1101 and multiple positive pressure distributor outlets 1102. The positive pressure distributor inlet 1101 and the positive pressure distributor outlets 1102 are respectively located on opposite sides of the positive pressure distributor 11. The multiple positive pressure distributor outlets 1102 are distributed at intervals along the axial direction of the positive pressure distributor 11. The positive pressure distributor inlet 1101 is located in the middle of the positive pressure distributor 11. Multiple positive pressure air ducts 10 are connected to the multiple positive pressure distributor outlets 1102 in a one-to-one correspondence. Each positive pressure air duct 10 is connected to a seed guide pipe 9.

[0040] The number of air inlets 402 of the negative pressure distributor and air outlets 1102 of the positive pressure distributor can be set according to actual needs, and there is no limit here.

[0041] Please refer to Figure 1 The airflow stabilization supply device of the present invention further includes a fan drive mechanism 1 and an air outlet receiver 13. The fan drive mechanism 1 is fixedly connected to the rotating shaft of the fan 2 and is used to drive the fan 2 to rotate. The air outlet receiver 13 is disposed on the positive pressure air outlet 202, and the positive pressure delivery mechanism is connected to the positive pressure air outlet 202 of the fan 2 through the air outlet receiver 13. The air outlet receiver 13 can partially or completely block the positive pressure air outlet 202, and the blocking ratio is determined according to the air pressure requirement.

[0042] In one embodiment, the air-suction seeder also includes a seed pressing wheel 8, which is installed behind the end of the seed guide tube 9 and is used to press the seeds that fall into the soil.

[0043] Please continue to refer to Figure 1 The airflow stabilization supply device also includes two pressure regulators 5, which are connected to the negative pressure distributor 4 and the positive pressure distributor 11 respectively. The two pressure regulators 5 are used to adjust the air pressure in the negative pressure distributor 4 and the positive pressure distributor 11 respectively, so that the negative pressure filling mechanism and the positive pressure conveying mechanism are maintained within the preset air pressure range.

[0044] Specifically, such as Figure 4As shown, the pressure regulator 5 includes a pressure regulating plate 501, a pressure relief pipe 502, and a pressure regulating component. The pressure regulating plate 501 is hinged to the pressure relief pipe 502 via a rotating shaft. The pressure regulating component is disposed on the outer wall of the pressure relief pipe 502, and one end of the pressure regulating component is connected to the pressure regulating plate 501. The pressure regulating component is used to apply a pulling force to the pressure regulating plate 501. When the air pressure in the negative pressure distributor 4 or the positive pressure distributor 11 is greater than the pulling force on the pressure regulating plate 501, the pressure regulating plate 501 rotates to open the pressure regulator, thereby achieving pressure stabilization.

[0045] like Figure 5 and Figure 6 As shown, the voltage stabilizing plate 501 includes a voltage stabilizing plate body 50102, a first rotating shaft 50101, a second rotating shaft 50103, and an adjusting plate ear 50104. The pressure relief pipe 502 is a hollow tubular structure with a pressure relief pipe channel 50202. The diameter of the voltage stabilizing plate body 50102 is adapted to the inner diameter of the pressure relief pipe 502, so that the voltage stabilizing plate body 50102 can completely cover the pressure relief pipe channel 50202. The first rotating shaft 50101 and the second rotating shaft 50103 are respectively fixed to opposite ends of the voltage stabilizing plate body 50102, and the adjusting plate ear 50104 is fixed to the end of the second rotating shaft 50103 away from the voltage stabilizing plate body 50102. The pressure relief pipe 502 is provided with a first mounting hole 50201 and a second mounting hole 50203 that penetrate the pipe wall. The first mounting hole 50201 and the second mounting hole 50203 are arranged opposite to each other. The pressure stabilizing plate body 50102 is hinged to the inside of the pressure relief pipe 502 through the first rotating shaft 50101 and the second rotating shaft 50103. The adjusting plate ear 50104 is arranged on the outside of the pressure relief pipe 502 through the second rotating shaft 50103.

[0046] Please refer to Figures 4-6 The pressure regulating assembly includes an adjusting spring 503, a pressure regulating screw 504, an adjusting reference plate 505, and an adjusting bolt 506. The adjusting reference plate 505 is fixed to the outer wall of the pressure relief pipe 502. One end of the adjusting spring 503 is fixedly connected to the adjusting lug 50104, and the other end is fixedly connected to the unthreaded end of the pressure regulating screw 504. The pressure regulating screw 504 passes through the adjusting reference plate 505, and its threaded end is threadedly connected to the adjusting bolt 506. By rotating the adjusting bolt 506, the tension of the adjusting spring 503 is adjusted, thereby regulating the air pressure of the pressure regulating plate 501. When the air pressure in the negative pressure distributor 4 or the positive pressure distributor 11 is greater than the tension on the pressure regulating plate 501, the pressure regulating plate 501 is rotated to open the pressure regulator, achieving pressure stabilization.

[0047] The air suction seeder single-fan positive and negative pressure dual-action airflow stabilization supply device of the present invention achieves two functions, negative pressure seed filling and positive pressure seed conveying, through a single fan, thereby simplifying the device structure and reducing costs; and through a pressure stabilizer, the positive and negative pressure airflow is regulated, reducing wind pressure fluctuations and unstable factors, achieving stable wind pressure control, and improving the accuracy and efficiency of sowing.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-fan positive and negative pressure dual-acting airflow stabilization supply device for an air-suction seeder, the air-suction seeder comprising an air-suction seed metering device and a seed guide tube, wherein the seed metering port of the air-suction seed metering device is connected to the seed inlet of the seed guide tube, characterized in that, The airflow stabilization supply device includes a fan, a negative pressure seed filling mechanism, and a positive pressure seed conveying mechanism; The fan includes a negative pressure air inlet and a positive pressure air outlet. One end of the negative pressure seed filling mechanism is connected to the negative pressure air inlet, and the other end of the negative pressure seed filling mechanism is connected to the air outlet of the air suction seed meter. One end of the positive pressure seed conveying mechanism is connected to the positive pressure air outlet, and the other end of the positive pressure seed conveying mechanism is connected to the seed guide tube. The fan is used to provide air pressure for the negative pressure seed filling mechanism and the positive pressure seed conveying mechanism. The negative pressure seed filling mechanism fills the air suction seed meter with seeds through negative pressure, and the positive pressure seed conveying mechanism conveys the seeds entering the seed guide tube through positive pressure. The negative pressure seed filling mechanism includes an air intake pipe, a negative pressure distributor, and a negative pressure air duct. One end of the air intake pipe is connected to the negative pressure air inlet, and the other end of the air intake pipe is connected to the air outlet of the negative pressure distributor. One end of the negative pressure air duct is connected to the air outlet of the air suction seed filling device, and the other end of the negative pressure air duct is connected to the air inlet of the negative pressure distributor. The positive pressure seed delivery mechanism includes an air blowing pipe, a positive pressure distributor, and a positive pressure air duct. One end of the air blowing pipe is connected to the positive pressure air outlet, and the other end of the air blowing pipe is connected to the air inlet of the positive pressure distributor. One end of the positive pressure air duct is connected to the air inlet of the seed guide pipe, and the other end of the positive pressure air duct is connected to the air outlet of the positive pressure distributor. It also includes two pressure regulators, which are respectively connected to the negative pressure distributor and the positive pressure distributor, and are used to adjust the air pressure in the negative pressure distributor and the positive pressure distributor respectively; The pressure regulator includes a pressure regulating plate, a pressure relief pipe, and a pressure regulating assembly. The pressure regulating plate is hinged to the pressure relief pipe via a rotating shaft. The pressure regulating assembly is disposed on the outer wall of the pressure relief pipe, and one end of the pressure regulating assembly is connected to the pressure regulating plate. The pressure regulating assembly is used to apply tension to the pressure regulating plate. When the air pressure in the negative pressure distributor or the positive pressure distributor is greater than the tension on the pressure regulating plate, the pressure regulating plate rotates to open the pressure regulator, thereby achieving pressure stabilization. The voltage stabilizing plate includes a voltage stabilizing plate body, a first rotating shaft, a second rotating shaft, and an adjusting plate lug. The diameter of the voltage stabilizing plate body is adapted to the inner diameter of the pressure relief pipe. The first rotating shaft and the second rotating shaft are respectively fixed to opposite ends of the voltage stabilizing plate body, and the adjusting plate lug is fixed to the end of the second rotating shaft away from the voltage stabilizing plate body. The pressure relief pipe is provided with two opposite mounting holes, which penetrate the pipe wall of the pressure relief pipe. The main body of the pressure stabilizing plate is hinged to the inside of the pressure relief pipe through the first rotating shaft and the second rotating shaft. The adjusting plate lug is disposed on the outside of the pressure relief pipe through the second rotating shaft. The pressure regulating assembly includes an adjusting spring, a pressure regulating screw, an adjusting reference plate, and an adjusting bolt; The adjusting reference plate is fixed to the outer wall of the pressure relief pipe. One end of the adjusting spring is fixedly connected to the adjusting plate lug, and the other end of the adjusting spring is fixedly connected to the unthreaded end of the pressure adjusting screw. The pressure adjusting screw passes through the adjusting reference plate, and the threaded end of the pressure adjusting screw is threadedly connected to the adjusting bolt. By rotating the adjusting bolt, the tension of the adjusting spring is adjusted, thereby adjusting the air pressure to open the pressure stabilizing adjusting plate.

2. The air-suction seeder single-fan positive and negative pressure dual-acting airflow stabilization supply device according to claim 1, characterized in that, The negative pressure distributor is provided with multiple air inlets spaced apart along its axial direction. Multiple negative pressure air ducts are connected to the multiple air inlets of the negative pressure distributor in a one-to-one correspondence. Each negative pressure air duct is connected to one of the air suction seed metering devices.

3. The air-suction seeder single-fan positive and negative pressure dual-acting airflow stabilization supply device according to claim 1, characterized in that, The positive pressure distributor is provided with multiple air outlets at intervals along its axial direction, and multiple positive pressure air ducts are connected to the multiple air outlets of the positive pressure distributor in a one-to-one correspondence, with each positive pressure air duct being connected to a seed guide pipe.

4. The air-suction seeder single-fan positive and negative pressure dual-acting airflow stabilization supply device according to claim 1, characterized in that, It also includes the fan drive mechanism and the air outlet connector; The fan transmission mechanism is fixedly connected to the rotating shaft of the fan, and the fan transmission mechanism is used to drive the fan to rotate; the air outlet receiver is disposed on the positive pressure air outlet, and the positive pressure seed conveying mechanism is connected to the positive pressure air outlet of the fan through the air outlet receiver.

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