Single-fan positive and negative pressure double-acting airflow stable supply device of air suction type seeder

Abstract

The invention relates to the technical field of agricultural machinery, and provides a single-fan positive-negative-pressure double-acting airflow stable supply device for an air-suction type seeder, the air-suction type seeder comprises an air-suction seed-metering device and a seed guide pipe, the air-suction seed-metering device is communicated with the seed guide pipe, and the airflow stable supply device comprises a fan, a negative-pressure seed filling mechanism and a positive-pressure seed conveying mechanism; the fan comprises a negative pressure air inlet and a positive pressure air outlet; one end of the negative-pressure seed filling mechanism is communicated with the negative-pressure air inlet, and the other end of the negative-pressure seed filling mechanism is communicated with an air outlet of the air-suction seed-metering device; one end of the positive-pressure seed conveying mechanism is communicated with the positive-pressure air outlet, and the other end is communicated with the seed guide pipe; the fan is used for providing air pressure for the negative-pressure seed filling mechanism and the positive-pressure seed conveying mechanism, the negative-pressure seed filling mechanism is used for filling the air-suction seed sowing device with seeds through negative pressure, and the positive-pressure seed conveying mechanism is used for conveying the seeds entering the seed guide pipe through positive pressure. The two functions of negative-pressure seed filling and positive-pressure seed conveying are achieved through the single fan, the device is simple in structure and low in cost, and the seeding accuracy and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to a single-fan positive-negative-pressure dual-action airflow stable supply device for an air-suction seeding machine. Background Art

[0002] In the technical field of air-suction seeders, the air supply device plays a vital role. As the power source for seed movement, it directly affects the accuracy and efficiency of seeding. At present, the mainstream air supply system on the market is mainly designed to provide a stable air supply for the seed meter to ensure that the seeds can be accurately and orderly discharged to the predetermined location. However, this design concept mainly focuses on the air flow requirements during the seeding stage during the seed movement process, but does not give sufficient consideration to the wind pressure requirements during the seed filling stage when the seeds are sent into the seed meter.

[0003] Specifically, existing airflow supply devices are usually only configured to meet the wind pressure requirements of the seed meter, that is, to provide the necessary air pressure when the seeds are discharged. However, during the process of transferring seeds from the seed box to the seed meter, that is, the seed filling stage, the existing devices do not provide sufficient wind pressure support, which may lead to insufficient stability of the seeds during the transportation process (especially the seed filling stage), thereby affecting the accuracy and uniformity of sowing. In addition, the wind pressure stabilization mechanism in the existing airflow supply device is often complex in structure, which not only increases the manufacturing cost, but also may introduce potential failure points due to too many mechanical components, reducing the reliability and durability of the system.

[0004] Therefore, how to design an air flow supply device that can provide stable air pressure during seed migration has become a technical problem that needs to be urgently solved in the current field of air suction seeder technology. Summary of the invention

[0005] The present invention provides a single-fan positive-negative pressure dual-acting airflow stable supply device for an air suction seeder, aiming to realize the two functions of negative pressure seed filling and positive pressure seed delivery through a single fan, thereby simplifying the device structure, reducing costs, and improving the accuracy and efficiency of seeding.

[0006] The present invention provides a single-fan positive-negative-pressure dual-action airflow stable supply device for an air-suction seeder, the air-suction seeder comprises an air-suction seeding device and a seed guide tube, the seeding port of the air-suction seeding device is connected to the seed inlet of the seed guide tube, and the airflow stable supply device comprises a fan, a negative-pressure seed filling mechanism and a positive-pressure seed feeding mechanism; The fan comprises 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 metering device; one end of the positive pressure seed delivery mechanism is connected to the positive pressure air outlet, and the other end of the positive pressure seed delivery mechanism is connected to the seed guide pipe; Among them, the fan is used to provide wind pressure for the negative pressure seed filling mechanism and the positive pressure seed transport mechanism. The negative pressure seed filling mechanism fills the air suction seed metering device with seeds through negative pressure, and the positive pressure seed transport mechanism transports seeds entering the seed guide tube through positive pressure.

[0007] According to the single-fan positive and negative pressure dual-acting airflow stable supply device for an air-suction seeder 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 seeding device, and the other end of the negative pressure air duct is connected to the air inlet of the negative pressure distributor.

[0008] According to the single-fan positive and negative pressure dual-acting airflow stable supply device for an air-suction seeder provided by the present invention, the negative pressure distributor is provided with a plurality of air inlets at intervals along its axial direction, a plurality of the negative pressure air ducts are connected one-to-one with the plurality of air inlets of the negative pressure distributor, and each of the negative pressure air ducts is correspondingly connected to an air-suction seeding device.

[0009] According to the single-fan positive and negative pressure dual-acting airflow stable supply device for an air-suction seeder provided by the present invention, the positive pressure seed transport 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.

[0010] According to the single-fan positive and negative pressure dual-acting airflow stable supply device for an air suction seeder provided by the present invention, the positive pressure distributor is provided with a plurality of air outlets at intervals along its axial direction, a plurality of the positive pressure air ducts are connected one-to-one with the plurality of air outlets of the positive pressure distributor, and each of the positive pressure air ducts is correspondingly connected to a seed guide tube.

[0011] The single-fan positive and negative pressure dual-acting airflow stable supply device for an air-suction seeder provided by the present invention also includes two pressure stabilizers, which are respectively connected to the negative pressure distributor and the positive pressure distributor, and are used to respectively adjust the wind pressure in the negative pressure distributor and the positive pressure distributor.

[0012] According to the air suction seeder single-fan positive and negative pressure dual-acting airflow stable supply device provided by the present invention, the pressure stabilizer includes a pressure stabilizing adjustment plate, a pressure relief pipe and a pressure regulating component, the pressure stabilizing adjustment plate is hinged in the pressure relief pipe through a rotating shaft, the pressure regulating component is arranged on the outer wall of the pressure relief pipe, and one end of the pressure regulating component is connected to the pressure stabilizing adjustment plate, the pressure regulating component is used to apply a pulling force to the pressure stabilizing adjustment plate, when the wind pressure in the negative pressure distributor or the positive pressure distributor is greater than the pulling force on the pressure stabilizing adjustment plate, the pressure stabilizing adjustment plate rotates to open the pressure stabilizer to achieve pressure stabilization.

[0013] According to the air suction seeding machine single fan positive and negative pressure double-acting airflow stable supply device provided by the present invention, the pressure stabilizing adjustment 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 the opposite ends of the pressure stabilizing plate body, and the adjusting plate ear is fixed to one end of the second rotating shaft away from the pressure stabilizing plate body; The pressure relief pipe is provided with two oppositely arranged mounting holes, and the mounting holes penetrate the pipe wall of the pressure relief pipe. The pressure stabilizing plate body is hinged in the pressure relief pipe through the first rotating shaft and the second rotating shaft, and the adjusting plate ear is arranged on the outside of the pressure relief pipe through the second rotating shaft.

[0014] According to the air suction seeding machine single fan positive and negative pressure double-acting airflow stable supply device provided by the present invention, the pressure adjustment component includes an adjustment tension spring, a pressure adjustment screw, an adjustment reference plate and an adjustment bolt; The adjusting reference plate is fixed to the outer wall of the pressure relief pipe, one end of the adjusting tension spring is fixedly connected to the adjusting plate ear, and the other end of the adjusting tension spring is fixedly connected to the threadless 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, and the tension of the adjusting tension spring is adjusted by rotating the adjusting bolt, thereby adjusting the wind pressure for opening the pressure stabilizing adjusting plate.

[0015] The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeding machine provided by the present invention also includes a fan transmission mechanism and an air outlet receiver; 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 adapter is arranged on the positive pressure air outlet, and the positive pressure transmission mechanism is connected to the positive pressure air outlet of the fan through the air outlet adapter.

[0016] The above technical solution of the present invention has the following beneficial effects: The single-fan positive-negative-pressure dual-acting airflow stable supply device for the air-suction seeder of the present invention realizes the two key functions of negative-pressure seed filling and positive-pressure seed transport through a single fan. This design not only simplifies the overall structure of the airflow supply device, but also significantly reduces the manufacturing cost. Compared with the traditional design that requires multiple fans or complex wind pressure stabilization mechanisms, the device of the present invention is more compact, efficient, easy to maintain and operate. In the negative-pressure seed filling stage, negative pressure is used to effectively adsorb seeds, ensuring that the seeds can be stably and orderly delivered to the air-suction seeding device; in the positive-pressure seed transport stage, positive pressure is used to stably transport the seeds entering the seed guide tube, avoiding the scattering or blockage of seeds during the transportation process, thereby greatly improving the accuracy and uniformity of sowing. In addition, the present invention uses a single fan to provide wind pressure, reducing the wind pressure fluctuations and unstable factors that may be caused by the coordinated work of multiple fans; at the same time, the positive and negative pressure dual-action design enables the airflow to remain continuous and stable during the filling and seed transportation process, so that the two processes of negative pressure filling and positive pressure seed transportation can 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a single-fan positive-negative-pressure dual-action airflow stable supply device for an air-suction seeding machine provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the fan of the air flow stabilization supply device shown in FIG. Figure 3 for Figure 1 A schematic diagram of the structure of the negative pressure distributor and the positive pressure distributor of the airflow stabilization supply device shown in ; Figure 4 for Figure 1 A schematic structural diagram of a pressurizer of an airflow stabilization supply device shown in FIG. Figure 5 for Figure 4 A schematic diagram of the structure of the voltage regulator regulating board of the voltage regulator shown in ; Figure 6 for Figure 4 Schematic diagram of the structure of the pressure relief pipe of the pressure regulator shown in FIG.

[0019] Reference numerals: 1. Fan transmission mechanism; 2. Fan; 3. Air suction pipe; 4. Negative pressure distributor; 5. Voltage stabilizer; 6. Air suction seeding device; 7. Negative pressure air duct; 8. Seed pressing wheel; 9. Seed guide tube; 10. Positive pressure air duct; 11. Positive pressure distributor; 12. Air blowing pipe; 13. Air outlet adapter; 201, Negative pressure air inlet; 202, Positive pressure air outlet; 401, Negative pressure distributor air outlet; 402, Negative pressure distributor air inlet; 1101, Positive pressure distributor air inlet Mouth; 1102, positive pressure distributor air outlet; 501, pressure stabilizing adjustment plate; 502, pressure relief pipe; 503, adjustment tension spring; 504, pressure adjustment screw; 505, adjustment reference plate; 506, adjustment bolt; 50101, first rotating shaft; 50102, pressure stabilizing plate body; 50103, second rotating shaft; 50104, adjustment plate ear; 50201, first mounting hole; 50202, pressure relief pipe channel; 50203, second mounting hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a single-fan positive-negative-pressure dual-action airflow stable supply device for an air-suction seeder, and the air-suction seeder includes an air-suction seeding device 6 and a seed guide tube 9. The seeding port of the air-suction seeding device 6 is connected to the seed inlet of the seed guide tube 9, and the seeds entering the air-suction seeding device 6 are discharged through the seed outlet of the seed guide tube 9. The airflow stable supply device of the present invention includes a fan 2, a negative pressure seed filling mechanism, and a positive pressure seed feeding mechanism.

[0022] Combination Figure 1 and Figure 2 As shown, the fan 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 of the negative pressure seed filling mechanism is connected to the air outlet of the air suction seed metering device 6. One end of the positive pressure seed delivery mechanism is connected to the positive pressure air outlet 202, and the other end of the positive pressure seed delivery mechanism is connected to the seed guide tube 9. The fan 2 is used to provide wind pressure for the negative pressure seed filling mechanism and the positive pressure seed delivery mechanism. The negative pressure seed filling mechanism fills the air suction seed metering device 6 with seeds through negative pressure, and the positive pressure seed delivery mechanism delivers seeds entering the seed guide tube 9 through positive pressure.

[0023] Specifically, the negative pressure seed filling mechanism includes an air suction pipe 3, a negative pressure distributor 4 and a negative pressure air duct 7. One end of the air suction pipe 3 is connected to the negative pressure air inlet 201, and the other end of the air suction 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 metering device 6, and the other end of the negative pressure air duct 7 is connected to the air inlet of the negative pressure distributor 4.

[0024] 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.

[0025] The airflow direction of the airflow stabilization supply device is as follows: Figure 1 As shown by the arrow in , during the rotation of the fan 2, the fan 2 inhales air from the air outlet of the air suction seed metering device 6 through the negative pressure seed filling mechanism, so that negative pressure is formed in the negative pressure seed filling mechanism, and negative pressure airflow is formed on the seed filling path of the seeds. In the seed filling stage, the seeds can be stably and orderly inhaled into the air suction seed metering device 6 through the negative pressure effect of the negative pressure seed filling mechanism, so as to achieve stable and accurate seed filling, and avoid the occurrence of leakage. The air inhaled by the fan 2 is discharged to the air inlet of the seed guide tube 9 through the positive pressure seed feeding mechanism under the action of the fan 2, so that positive pressure is formed in the positive pressure seed feeding mechanism, and positive pressure airflow is formed on the seed discharging (transfer) path of the seeds. In the seed feeding stage, the seeds can be stably and orderly discharged from the seed outlet of the seed guide tube 9 through the positive pressure effect of the positive pressure seed feeding mechanism, so as to achieve stable and accurate seed discharging. The positive and negative pressure dual-action design of the present invention enables the airflow to remain continuous and stable during the seed filling and seed transport processes, and enables the two processes of negative pressure seed filling and positive pressure seed transport to be efficiently connected, thereby 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.

[0026] like Figure 3 As shown, the negative pressure distributor 4 includes a negative pressure distributor air outlet 401 and multiple negative pressure distributor air inlets 402. The negative pressure distributor air outlet 401 and the negative pressure distributor air inlet 402 are respectively arranged on opposite sides of the negative pressure distributor 4, and the multiple negative pressure distributor air inlets 402 are distributed at intervals along the axial direction of the negative pressure distributor 4. The negative pressure distributor air outlet 401 is arranged in the middle position of the negative pressure distributor 4, and multiple negative pressure air ducts 7 are connected to the multiple negative pressure distributor air inlets 402 one by one, and each negative pressure air duct 7 is correspondingly connected to an air suction seeding device 6.

[0027] The positive pressure distributor 11 includes a positive pressure distributor air inlet 1101 and multiple positive pressure distributor air outlets 1102. The positive pressure distributor air inlet 1101 and the positive pressure distributor air outlets 1102 are respectively arranged on opposite sides of the positive pressure distributor 11. The multiple positive pressure distributor air outlets 1102 are distributed at intervals along the axial direction of the positive pressure distributor 11. The positive pressure distributor air inlet 1101 is arranged in the middle position of the positive pressure distributor 11. Multiple positive pressure air ducts 10 are connected to the multiple positive pressure distributor air outlets 1102 one by one, and each positive pressure air duct 10 is correspondingly connected to a seed guide tube 9.

[0028] Among them, the number of negative pressure distributor air inlets 402 and positive pressure distributor air outlets 1102 can be set according to actual needs and is not limited here.

[0029] Please refer to Figure 1 The air flow stabilization supply device of the present invention further includes a fan transmission mechanism 1 and an air outlet adapter 13. The fan transmission mechanism 1 is fixedly connected to the rotating shaft of the fan 2, and the fan transmission mechanism 1 is used to drive the fan 2 to rotate; the air outlet adapter 13 is arranged on the positive pressure air outlet 202, and the positive pressure transmission mechanism is connected to the positive pressure air outlet 202 of the fan 2 through the air outlet adapter 13. Among them, the air outlet adapter 13 can partially or completely block the positive pressure air outlet 202, and the blocking ratio is determined according to the wind pressure requirement.

[0030] In one embodiment, the pneumatic seeder further 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.

[0031] Please continue to refer to Figure 1 The air flow stabilization supply device also includes two pressure stabilizers 5, which are respectively connected to the negative pressure distributor 4 and the positive pressure distributor 11. The two pressure stabilizers 5 are used to adjust the wind pressure in the negative pressure distributor 4 and the positive pressure distributor 11 respectively, so that the negative pressure seed filling mechanism and the positive pressure seed delivery mechanism are maintained within a preset wind pressure range.

[0032] Specifically, Figure 4 As shown, the voltage stabilizer 5 includes a voltage stabilizer regulating plate 501, a pressure relief pipe 502 and a pressure regulating component. The voltage stabilizer regulating plate 501 is hinged in the pressure relief pipe 502 through a rotating shaft. The pressure regulating component is arranged on the outer wall of the pressure relief pipe 502, and one end of the pressure regulating component is connected to the voltage stabilizer regulating plate 501. The pressure regulating component is used to apply a pulling force to the voltage stabilizer regulating plate 501. When the wind pressure in the negative pressure distributor 4 or the positive pressure distributor 11 is greater than the pulling force on the voltage stabilizer regulating plate 501, the voltage stabilizer regulating plate 501 is opened by rotating to achieve voltage stabilization.

[0033] like Figure 5 and Figure 6As shown, the voltage stabilizing and regulating plate 501 includes a voltage stabilizing plate body 50102, a first rotating shaft 50101, a second rotating shaft 50103 and an regulating plate ear 50104. The pressure relief pipe 502 is a hollow tubular structure, having 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 the opposite ends of the voltage stabilizing plate body 50102, and the regulating plate ear 50104 is fixed to one 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 which penetrate the wall of the pressure relief pipe. The first mounting hole 50201 and the second mounting hole 50203 are arranged opposite to each other. The voltage stabilizing plate body 50102 is hinged in 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.

[0034] Please refer to Figure 4-Figure 6 The pressure regulating assembly includes an adjusting tension 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 tension spring 503 is fixedly connected to the adjusting plate ear 50104, and the other end of the adjusting tension spring 503 is fixedly connected to the non-threaded end of the pressure regulating screw 504; the pressure regulating screw 504 passes through the adjusting reference plate 505, and the threaded end of the pressure regulating screw 504 is threadedly connected to the adjusting bolt 506. By rotating the adjusting bolt 506, the tension of the adjusting tension spring 503 is adjusted, and then the wind pressure of opening the pressure stabilizing regulating plate 501 is adjusted. When the wind pressure in the negative pressure distributor 4 or the positive pressure distributor 11 is greater than the tension of the pressure stabilizing regulating plate 501, the pressure stabilizing regulating plate 501 is rotated to open the voltage stabilizer to achieve voltage stabilization.

[0035] The single-fan positive-negative-pressure dual-acting airflow stable supply device for an air-suction seeder of the present invention realizes the two functions of negative-pressure seed filling and positive-pressure seed transport through a single fan, thereby simplifying the device structure and reducing costs; and the positive-negative-pressure airflow is regulated by a voltage stabilizer, thereby reducing wind pressure fluctuations and unstable factors, realizing stable wind pressure control, and improving the accuracy and efficiency of seeding.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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-action airflow stable supply device for an air-suction seeder, the air-suction seeder comprising an air-suction seeding device and a seed guide tube, the seeding port of the air-suction seeding device is connected to the seed inlet of the seed guide tube, characterized in that: The stable airflow supply device comprises a fan, a negative pressure seed filling mechanism and a positive pressure seed delivery mechanism; The fan comprises 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 metering device; one end of the positive pressure seed delivery mechanism is connected to the positive pressure air outlet, and the other end of the positive pressure seed delivery mechanism is connected to the seed guide pipe; Among them, the fan is used to provide wind pressure for the negative pressure seed filling mechanism and the positive pressure seed transport mechanism. The negative pressure seed filling mechanism fills the air suction seed metering device with seeds through negative pressure, and the positive pressure seed transport mechanism transports seeds entering the seed guide tube through positive pressure.

2. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 1 is characterized in that: 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 seeding device, and the other end of the negative pressure air duct is connected to the air inlet of the negative pressure distributor.

3. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 2 is characterized in that: The negative pressure distributor is provided with a plurality of air inlets at intervals along its axial direction, a plurality of the negative pressure air ducts are connected to the plurality of air inlets of the negative pressure distributor in a one-to-one correspondence, and each of the negative pressure air ducts is correspondingly connected to one of the air suction seeding devices.

4. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 2 is characterized in that: 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.

5. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 4 is characterized in that: The positive pressure distributor is provided with a plurality of air outlets at intervals along its axial direction, a plurality of the positive pressure air ducts are connected to the plurality of air outlets of the positive pressure distributor in a one-to-one correspondence, and each of the positive pressure air ducts is correspondingly connected to a seed guide tube.

6. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 4 is characterized in that: It also includes two pressure stabilizers, which are respectively connected to the negative pressure distributor and the positive pressure distributor, and are used to adjust the wind pressure in the negative pressure distributor and the positive pressure distributor respectively.

7. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 6 is characterized in that: The pressure stabilizer includes a pressure stabilizing regulating plate, a pressure relief pipe and a pressure regulating assembly. The pressure stabilizing regulating plate is hinged in the pressure relief pipe through a rotating shaft. The pressure regulating assembly is arranged on the outer wall of the pressure relief pipe, and one end of the pressure regulating assembly is connected to the pressure stabilizing regulating plate. The pressure regulating assembly is used to apply a pulling force to the pressure stabilizing regulating plate. When the wind pressure in the negative pressure distributor or the positive pressure distributor is greater than the pulling force applied to the pressure stabilizing regulating plate, the pressure stabilizing regulating plate rotates to open the pressure stabilizer to achieve pressure stabilization.

8. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 7 is characterized in that: The voltage stabilizing and adjusting plate comprises a voltage stabilizing plate body, a first rotating shaft, a second rotating shaft and an adjusting plate ear, 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 ear is fixed to an end of the second rotating shaft away from the voltage stabilizing plate body; The pressure relief pipe is provided with two oppositely arranged mounting holes, and the mounting holes penetrate the pipe wall of the pressure relief pipe. The pressure stabilizing plate body is hinged in the pressure relief pipe through the first rotating shaft and the second rotating shaft, and the adjusting plate ear is arranged on the outside of the pressure relief pipe through the second rotating shaft.

9. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeding machine according to claim 8 is characterized in that: The pressure adjustment assembly includes an adjustment tension spring, a pressure adjustment screw, an adjustment reference plate and an adjustment bolt; The adjusting reference plate is fixed to the outer wall of the pressure relief pipe, one end of the adjusting tension spring is fixedly connected to the adjusting plate ear, and the other end of the adjusting tension spring is fixedly connected to the threadless 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, and the tension of the adjusting tension spring is adjusted by rotating the adjusting bolt, thereby adjusting the wind pressure for opening the pressure stabilizing adjusting plate.

10. The single-fan positive and negative pressure dual-action airflow stable supply device for an air-suction seeder according to claim 1, characterized in that: It also includes a fan transmission mechanism and an air outlet receiver; 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 adapter is arranged on the positive pressure air outlet, and the positive pressure transmission mechanism is connected to the positive pressure air outlet of the fan through the air outlet adapter.

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