Constant-pressure air source device for planting and launching plant seeds

Abstract

The utility model discloses a constant-pressure air source device for planting and launching plant seeds, which is characterized by comprising an air inflation chamber with a vertical upward opening, a piston plate capable of sliding up and down is horizontally arranged on the inner side wall of the air inflation chamber, a balancing weight is placed on the upper surface of the piston plate, and the front side of the lower portion of the air inflation chamber is connected with the rear end of an air inlet pipe. The rear side of the lower portion of the inflation chamber is connected with an air pump through an inflation pipe, and an air inlet control valve is arranged on the inflation pipe. The pressure-stabilizing gas supply device can realize pressure-stabilizing gas supply, and has the advantages of simple structure, reliability and stability in control and convenience in regulation and control of pressure.

Description

Technical Field

[0001] This utility model relates to the field of bank slope greening technology, specifically to a constant pressure gas source device for seed planting and launching. Background Technology

[0002] Among existing technologies for slope greening, hydroseeding is a common and highly efficient method. The principle of hydroseeding is to mix plant seeds with water-retaining materials and nutrient substrates, then spray the mixture onto the slope surface using a spraying device. Once the seeds germinate and grow into vegetation, the slope is greened and protected.

[0003] However, this hydroseeding method is generally more suitable for locations like roadside slopes than for riverbanks. This is because riverbanks are often subject to erosion and vegetation loss due to water flow. If hydroseeding is used, the substrate adhering to the slope surface is easily washed away by the water flow, and it can also adhere to existing vegetation, hindering its growth. Furthermore, in some steeper river sections, it is difficult for ships to dock, making it challenging to achieve the required hydroseeding distance.

[0004] To address the aforementioned issues, the applicant previously filed and subsequently published a utility model patent, "A Method for Planting Vegetation on Riverbank Slopes," patent application number 2025105671636. This patent involves mixing plant seeds and a nutrient substrate to create a bullet-shaped launcher, which is then launched from a boat on the river using compressed gas to embed itself into the riverbank soil, thus planting vegetation. However, this patent relies on an engine driving a piston device in reciprocating motion to provide circulating gas pressure and propel the launcher. The launch rate of this device is determined by the reciprocating speed of the piston device. Therefore, it suffers from drawbacks such as a low launch rate, inconvenient adjustment, poor piston device stability, and short service life.

[0005] To further address the aforementioned deficiencies, the applicant has considered designing an isobaric jet seed planting device, comprising a launching device located at the front end. The launching device includes a launching tube horizontally positioned at the front end, the inner cavity of which is a launching chamber, and the rear end of which is connected to an air inlet. The upper end face of the rear half of the launching tube is provided with a projectile inlet, and a vertical projectile compartment is fixedly connected upward at the projectile inlet. The projectile compartment is used to fill a projectile made of a mixture of plant seeds and nutrient substrate. The projectile is bullet-shaped with its tip pointing forward. The device is characterized in that a constant pressure air source device is connected to the rear end of the air inlet, and an air inlet switch control mechanism is also provided on the air inlet to control the air inlet to achieve intermittent continuous air intake.

[0006] Thus, compared to prior patents, the above solution, due to the constant pressure air source device connected to the air intake pipe, can provide a constant air pressure flow each time air is introduced. The airflow impacts the launch chamber and acts on the launcher that falls from the bomb bay into the launch tube, completing the ejection and firing of the launcher. In this way, the use of isobaric injection to control the launch of the seed launcher results in better launch stability and easier control of the launch rate.

[0007] However, in existing technologies, the devices used to achieve a constant pressure air supply typically employ high-pressure compressed air tanks with pressure regulating valves installed in the outlet pipes. This existing method of supplying a constant pressure air source places high demands on the pressure regulating valve, making it difficult to effectively adjust the pressure. Furthermore, it is prone to pressure loss when the air volume in the tank decreases, resulting in poor stability. Utility Model Content

[0008] To address the aforementioned shortcomings, the technical problem to be solved by this utility model is: how to provide a constant pressure gas source device for plant seed planting and emission that can achieve stable gas supply, has a simple structure, reliable and stable control, and can easily adjust and control the pressure.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] A constant pressure air source device for seed planting and launching is characterized in that it includes an air chamber with a vertically upward opening, a piston plate that can slide up and down is horizontally arranged on the inner side wall of the air chamber, a counterweight is placed on the upper surface of the piston plate, the lower front side of the air chamber is connected to the rear end of the air inlet pipe, and the lower rear side of the air chamber is connected to an air pump through an air inlet pipe, and an air inlet control valve is provided on the air inlet pipe.

[0011] In this device, the inflation chamber is inflated by an air pump, causing the piston to rise. The air pressure inside the inflation chamber is controlled by the size of the counterweight above the piston plate. During inflation, the air pressure inside the inflation chamber remains stable and matches the weight of the counterweight. After inflation is complete, the inflation pipe is closed, creating a pressure source within the inflation chamber that supplies air to the inlet pipe. As airflow dissipates, the piston plate gradually moves downwards, ensuring that the air pressure inside the inflation chamber remains stable and matches the weight of the counterweight during deflation. This simple structure achieves a stable, constant-pressure air supply to the inlet pipe. Compared to using a compressed air tank with a pressure-regulating valve for constant-pressure control, this method is simpler, more reliable and stable, and allows for pressure adjustment through the weight of the counterweight.

[0012] Furthermore, the air intake control valve is a one-way air intake valve. This allows for inflation when the air pump is turned on and for the inflation hose to automatically close when the pump is turned off, making control simpler and more convenient.

[0013] Furthermore, a vertical cylindrical airbag sleeve is also provided in the inflation chamber cavity. The upper end of the airbag sleeve is sealed and fixed at the periphery of the lower surface of the piston plate, and the lower end is sealed and fixed along the periphery on the side wall of the inflation chamber cavity adjacent to the upper part of the air inlet pipe and the inflation pipe.

[0014] This is because conventional sealing methods, such as using a sealing ring around the piston plate, are prone to air leakage, and the friction between the sealing ring and the inner cavity of the inflation chamber can affect the control effect of maintaining a constant pressure air supply within the inflation chamber. However, with the airbag sleeve structure described in this application, the normal height of the airbag sleeve after straightening can be set greater than the depth of the inner cavity of the inflation chamber. This allows the airbag sleeve to effectively seal the gas within the inflation chamber while remaining unstressed, thus not affecting the vertical sliding of the piston plate or the constant pressure effect of the air supply. Therefore, it better ensures the stability of the constant pressure air supply, improves the stability of the device, and extends its service life.

[0015] Furthermore, a normally open contact inflation switch is provided at the bottom of the inflation chamber, protruding upwards. The contact inflation switch is connected to the air pump's switch control module and is used to control the air pump's operation. A push rod is vertically installed on one side of the upper end of the piston plate, and a normally open contact air cut-off switch is correspondingly installed at the upper end of the push rod. The contact air cut-off switch is connected to the air pump's switch control module and is used to control the air pump's shutdown.

[0016] In this way, as the air supply to the inflation chamber gradually runs out, the piston plate gradually falls and contacts the contact-type inflation switch, closing it and turning on the air pump to inflate the inflation chamber. During inflation, the piston plate gradually rises until the upper end of the push rod touches the contact-type air shut-off switch, closing it and turning off the air pump to stop inflation. This achieves automatic control of the air pump inflation.

[0017] Furthermore, the air pump's switch control module includes a power supply. An air pump control circuit is formed by connecting the power supply and the air pump in series. A single-pole double-throw switch is installed on the air pump control circuit. The single-pole double-throw switch has two stationary contacts and a conductive rod made of iron. The two stationary contacts are horizontally spaced apart. The lower end of the conductive rod is mounted between the two stationary contacts via a pivot, allowing its upper end to rotate left and right to connect with the two stationary contacts. The air pump control circuit is connected between one of the stationary contacts and the conductive rod. An inflation control electromagnet is located adjacent to the stationary contact connected to the air pump control circuit, and an air cut-off control electromagnet is located adjacent to the other stationary contact. An inflation control circuit is formed by connecting the power supply and the contact-type inflation switch, with the inflation control electromagnet connected in series in the inflation control circuit. An air cut-off control circuit is formed by connecting the power supply and the contact-type air cut-off switch, with the air cut-off control electromagnet connected in series in the air cut-off control circuit.

[0018] Thus, as the air supply in the inflation chamber gradually runs out, the piston plate gradually falls and contacts the contact-type inflation switch. The contact-type inflation switch closes, connecting the inflation control circuit. This, in turn, activates the inflation control electromagnet, attracting the conductive contact of the single-pole double-throw switch to rotate to one end, making contact with the stationary contact at that end. This connects the air pump control circuit, and the air pump begins inflation. After inflation, the piston plate rises and disengages from the contact-type inflation switch, which returns to its normally open state. The inflation control electromagnet is de-energized, but the conductive contact remains connected to the air pump control circuit under its own weight, and the air pump continues inflation. Then, during inflation, the piston plate gradually rises until the top rod contacts the contact-type air cut-off switch. This closes the contact-type air cut-off switch, connecting the air cut-off control circuit. This, in turn, activates the air cut-off control electromagnet, attracting the conductive contact of the single-pole double-throw switch to rotate to one end, disconnecting the air pump control circuit and stopping the air pump. In this way, a switch control module composed of simple switching devices can achieve automatic cyclic control of air pump inflation and shutdown, greatly improving the level of automation control of the equipment.

[0019] Furthermore, the contact-type inflation switch is positioned higher than the air inlet pipe and inflation pipe to better ensure smooth inflation.

[0020] Furthermore, the contact-type inflation switch includes a pressure block mounting groove protruding from the bottom of the inflation chamber. A pressure block is installed in the pressure block mounting groove, with the upper end of the pressure block protruding out of the pressure block mounting groove. Support arms extend outward from both sides of the middle of the pressure block, and rollers are provided at the outer ends of the support arms, which are in contact with the inner sidewall of the pressure block mounting groove. A conductive contact is provided on the lower end face of the pressure block, and two horizontally spaced conductive contacts are correspondingly provided below the conductive contact. The two conductive contacts are connected in the inflation control circuit. A pressure block support spring is provided below each of the two support arms. The pressure block support spring is used to keep the conductive contact and the conductive contacts in a normally open state with a gap. The height of the upper end of the pressure block protruding from the pressure block mounting groove is greater than the distance between the conductive contact and the conductive contacts.

[0021] In this way, after the air volume in the inflation chamber decreases, the piston plate descends and contacts the pressure block, pressing it down. This causes the conductive contact block to contact the two conductive contacts, completing the connection of the inflation control circuit. This design offers the advantages of stable and reliable structure.

[0022] In summary, this invention can achieve stable gas supply and has the advantages of simple structure, reliable and stable control, and convenient adjustment and control of pressure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an isobaric jet seed planting device that employs the structure of this utility model.

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of a single emitter.

[0025] Figure 3 for Figure 1 A magnified schematic diagram of the structure of the individual launch device.

[0026] Figure 4 for Figure 1 A magnified schematic diagram of the structure of a standalone constant pressure gas source device.

[0027] Figure 5 for Figure 1 A magnified schematic diagram of a single-contact inflation switch. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to an isobaric jet seed planting device employing the structure of the present invention and its accompanying drawings.

[0029] Preferred embodiment: An isobaric jet seed planting device, see [link to previous description] Figure 1-5As shown, the device includes a launching device located at the front end. The launching device includes a launching tube 1 horizontally arranged at the front end. The inner cavity of the launching tube 1 is a launching chamber and the rear end is connected to an air inlet 2. The upper end face of the rear half of the launching tube 1 is provided with a projectile inlet. A vertical projectile compartment 3 is fixedly connected to the projectile inlet. The projectile compartment 3 is used to fill the projectile 4, which is made by mixing plant seeds 5 and nutrient substrate. The projectile 4 is bullet-shaped with the tip pointing forward. The rear end of the air inlet 2 is connected to a constant pressure air source device. The air inlet 2 is also provided with an air inlet switch control mechanism to control the air inlet to achieve intermittent continuous air intake.

[0030] In this way, the air intake switch control mechanism can control the air intake pipe to achieve intermittent continuous air intake. Because the air intake pipe is connected to a constant pressure air source device, a constant air pressure and airflow can be provided each time air is intaked. The airflow impacts the launch chamber and acts on the projectile that falls from the bomb bay into the launch tube, completing the firing of the projectile. This allows the projectile containing plant seeds to be launched and embedded in the soil of the riverbank, thus preventing it from being easily washed away by river water. After the seeds germinate, they take root and grow into plants, thereby achieving the greening of the riverbank.

[0031] The intake switch control mechanism includes a ball valve 6, which is installed on a fixed section of the intake pipe. The ball valve 6 has a rotatable valve core. One end of the valve core's rotating shaft passes through the ball valve's sleeve and is fitted with a driven gear 7. The intake switch control mechanism also includes a transmission rod 8 that can slide along its own length. An output rack 9 is provided on the transmission rod along its length and meshes with the driven gear 7. An input rack 10 is also provided on the transmission rod 8 along its length and meshes with an arc-shaped rack on the edge of a sector-shaped gear disk 11. The handle of the sector-shaped gear disk 11 is rotatably mounted on a fixed swing shaft. The handle of the sector-shaped gear disk 11 extends outward to form a swing handle. A groove 12 is provided on the swing handle along its own length. A matching slider 13 is slidably engaged on the groove 12. The slider 13 is eccentrically fixed on a turntable 14, which is connected to a transmitting motor 15.

[0032] In this way, the launching motor drives the turntable to rotate. The turntable, through the cooperation of the slider and the groove, drives the swing handle to swing back and forth. This, in turn, through the meshing of the sector gear and the input rack, drives the transmission rod to slide back and forth. Finally, through the meshing of the output rack and the driven gear, it drives the valve core to rotate reciprocally. This allows the ball valve to reciprocate to open and close the air intake, achieving intermittent continuous air intake and completing the intermittent continuous ejection of the launcher. It features a simple structure, reliable and stable control, and a fast launch rate.

[0033] The transmission rod 8 is slidably mounted within two limiting sleeves 16, which better ensures the stability of the transmission rod during its back-and-forth sliding.

[0034] The intake pipe is also equipped with an independent intake control switch valve 17 for better control.

[0035] The launch tube is equipped with a projectile inlet control mechanism, which includes a launcher baffle 18 horizontally positioned at the lower end of the missile compartment 3. The front half of the launcher baffle 18 is located inside the projectile inlet, and the rear half is located in a baffle mounting groove formed by an upward protrusion on the rear half of the launch tube. The rear end of the launcher baffle can slide horizontally through the baffle mounting groove and is connected to the front end of a pull rope 19. The fixed section of the air intake pipe and the transmission rod are both arranged along the length of the launch tube. The rear end of the pull rope 19 is fixedly connected to the front end of the transmission rod. A baffle return spring 20 is also provided in the baffle mounting groove. The baffle return spring 20 acts on the launcher baffle 18 to keep its front half inside the projectile inlet.

[0036] This design ensures that each back-and-forth movement of the transmission rod, while simultaneously allowing air intake through the air inlet, also pulls the launcher baffle backward, causing the launcher in the upper chamber to fall into the firing chamber after firing, thus completing the automatic loading of the launcher. This allows for precise, intermittent, continuous firing of the launcher, achieving automated continuous firing and ensuring firing stability.

[0037] In the launching device, there are multiple launching tubes 1 arranged horizontally side by side. The front end of the fixed section of the air inlet pipe 2 is connected to multiple air inlet branch pipes. The front end of each air inlet branch pipe is connected to the rear end of each launching tube. The rear end of the launching body baffle at the rear of each launching tube is connected to the front end of the transmission rod by a pull rope.

[0038] This allows for the control and firing of a row of projectiles in a single shot, improving planting efficiency.

[0039] The front half of the air intake pipe 2 is a flexible hose, and the lower surface of the launch tube 1 is rotatably mounted on the upper end of a support 21. The front or rear end of the lower surface of the launch tube 1 is mounted on a vertically set height adjustment mechanism.

[0040] This makes it easy to control and adjust the height and direction of the emission from the transmitter tube.

[0041] The height adjustment mechanism includes a rod 22 with its upper end hinged to the launch tube. The lower end of the rod is inserted into a vertically arranged slot 23. A row of slots is also arranged horizontally on the lower side surface of the rod. A pin 24 is horizontally inserted through the outside of the slot and fixed in the slot.

[0042] In this way, by pulling out the pin, adjusting the height of the insertion rod, and then inserting the pin again to lock it into the slot, the insertion rod is fixed. This design features a simple structure, convenient height adjustment, and quick and stable fixation after adjustment.

[0043] The constant pressure air source device includes an air chamber 30 with a vertically upward opening. A piston plate 31 that can slide up and down is horizontally arranged on the inner wall of the air chamber 30. A counterweight 32 is placed on the upper surface of the piston plate 31. The lower front side of the air chamber 30 is connected to the rear end of the air inlet pipe. The lower rear side of the air chamber is connected to the air pump 33 through an air inlet pipe. An air inlet control valve 34 is provided on the air inlet pipe.

[0044] This is because conventional constant-pressure air supply devices use high-pressure compressed air tanks and pressure-regulating valves installed in the outlet pipes. However, this method places high demands on the pressure-regulating valve, making it difficult to effectively adjust the pressure. Furthermore, a decrease in the air volume within the tank can easily lead to pressure loss, resulting in poor stability. In contrast, this proposed device uses an air pump to inflate the inflation chamber, raising the piston upwards. The air pressure within the inflation chamber is controlled by the size of the counterweight above the piston plate. During inflation, the air pressure inside the inflation chamber remains stable and matches the weight of the counterweight. After inflation is complete, the inflation pipe is closed, creating a pressure source within the inflation chamber that supplies air to the inlet pipe. As airflow dissipates, the piston plate gradually moves downwards, ensuring that the air pressure inside the inflation chamber remains stable and matches the weight of the counterweight during deflation. This simple structure achieves stable, constant-pressure air supply to the inlet pipe. Compared to using a compressed air tank with a pressure-regulating valve for constant-pressure control, this method is simpler, more reliable and stable, and allows for pressure adjustment through the weight of the counterweight.

[0045] The air intake control valve 34 is a one-way air intake valve. This allows for inflation when the air pump is turned on and for the inflation pipe to automatically close when the pump is turned off, making control simpler and more convenient.

[0046] The inflation chamber is also equipped with a vertical cylindrical airbag sleeve 35. The upper end of the airbag sleeve is sealed and fixed to the periphery of the lower surface of the piston plate, and the lower end is sealed and fixed to the side wall of the inflation chamber adjacent to the air inlet pipe and the inflation pipe.

[0047] This is because conventional sealing methods, such as using a sealing ring around the piston plate, are prone to air leakage, and the friction between the sealing ring and the inner cavity of the inflation chamber can affect the control effect of maintaining a constant pressure air supply within the inflation chamber. However, with the airbag sleeve structure described in this application, the normal height of the airbag sleeve after straightening can be set greater than the depth of the inner cavity of the inflation chamber. This allows the airbag sleeve to effectively seal the gas within the inflation chamber while remaining unstressed, thus not affecting the vertical sliding of the piston plate or the constant pressure effect of the air supply. Therefore, it better ensures the stability of the constant pressure air supply, improves the stability of the device, and extends its service life.

[0048] The inflation chamber has a normally open contact inflation switch 36 protruding upwards at the bottom. The contact inflation switch is connected to the air pump's switch control module and is used to control the air pump's operation. A push rod 37 is vertically upwards on one side of the upper end of the piston plate. A normally open contact air shut-off switch 38 is correspondingly installed on the upper end of the push rod 37. The contact air shut-off switch is connected to the air pump's switch control module and is used to control the air pump's shutdown.

[0049] In this way, as the air supply to the inflation chamber gradually runs out, the piston plate gradually falls and contacts the contact-type inflation switch, closing it and turning on the air pump to inflate the inflation chamber. During inflation, the piston plate gradually rises until the upper end of the push rod touches the contact-type air shut-off switch, closing it and turning off the air pump to stop inflation. This achieves automatic control of the air pump inflation.

[0050] The air pump 33's switching control module includes a power supply 40. The power supply 40 and the air pump 33 are connected in series to form an air pump control circuit 41. A single-pole double-throw switch 42 is installed on the air pump control circuit. The single-pole double-throw switch 42 has two stationary contacts and a conductive rod made of iron. The two stationary contacts are horizontally spaced apart. The lower end of the conductive rod is mounted between the two stationary contacts via a rotating shaft, allowing its upper end to rotate left and right to connect with the two stationary contacts. The air pump control circuit 41 is connected to one of the stationary contacts and... Between the conductive contact rods; an inflation control electromagnet 43 is installed adjacent to the stationary contact connected to the air pump control circuit, and an air cut-off control electromagnet 44 is installed adjacent to the other stationary contact. An inflation control circuit 45 is formed by connecting the power supply 40 and the contact-type inflation switch 36, and the inflation control electromagnet 43 is connected in series in the inflation control circuit 45. An air cut-off control circuit 46 is formed by connecting the power supply 40 and the contact-type air cut-off switch 38, and the air cut-off control electromagnet 44 is connected in series in the air cut-off control circuit 46.

[0051] Thus, as the air supply in the inflation chamber gradually runs out, the piston plate gradually falls and contacts the contact-type inflation switch. The contact-type inflation switch closes, connecting the inflation control circuit. This, in turn, activates the inflation control electromagnet, attracting the conductive contact of the single-pole double-throw switch to rotate to one end, making contact with the stationary contact at that end. This connects the air pump control circuit, and the air pump begins inflation. After inflation, the piston plate rises and disengages from the contact-type inflation switch, which returns to its normally open state. The inflation control electromagnet is de-energized, but the conductive contact remains connected to the air pump control circuit under its own weight, and the air pump continues inflation. Then, during inflation, the piston plate gradually rises until the top rod contacts the contact-type air cut-off switch. This closes the contact-type air cut-off switch, connecting the air cut-off control circuit. This, in turn, activates the air cut-off control electromagnet, attracting the conductive contact of the single-pole double-throw switch to rotate to one end, disconnecting the air pump control circuit and stopping the air pump. In this way, a switch control module composed of simple switching devices can achieve automatic cyclic control of air pump inflation and shutdown, greatly improving the level of automation control of the equipment.

[0052] The contact-type inflation switch 36 is positioned higher than the air inlet pipe and inflation pipe to better ensure smooth inflation.

[0053] The contact-type inflation switch 36 includes a pressure block mounting groove 48 protruding from the bottom of the inflation chamber. A pressure block 49 is installed in the pressure block mounting groove. The upper end of the pressure block protrudes from the pressure block mounting groove. Support arms extend outward from both sides of the middle of the pressure block. Rollers 53 are provided at the outer ends of the support arms and are in contact with the inner sidewall of the pressure block mounting groove. A conductive contact 50 is provided on the lower end face of the pressure block. Two horizontally spaced conductive contacts 51 are provided below the conductive contact. The two conductive contacts are connected in the inflation control circuit. A pressure block support spring 52 is provided below each of the two support arms. The pressure block support spring is used to keep the conductive contact and the conductive contacts in a normally open state with a gap. The height of the upper end of the pressure block protruding from the pressure block mounting groove is greater than the distance between the conductive contact and the conductive contacts.

[0054] In this way, after the air volume in the inflation chamber decreases, the piston plate descends and contacts the pressure block, pressing it down. This causes the conductive contact block to contact the two conductive contacts, completing the connection of the inflation control circuit. This design offers the advantages of stable and reliable structure.

Claims

1. A constant pressure gas source device for seed planting, characterized in that, It includes an air chamber with a vertically open opening. A piston plate that can slide up and down is horizontally installed on the inner side wall of the air chamber. A counterweight is placed on the upper surface of the piston plate. The lower front of the air chamber is connected to the rear end of the air inlet pipe. The lower rear of the air chamber is connected to an air pump through an air inlet pipe. An air inlet control valve is installed on the air inlet pipe.

2. The constant pressure gas source device for plant seed planting and emission as described in claim 1, characterized in that, The intake control valve is a one-way intake valve.

3. The constant pressure gas source device for plant seed planting and emission as described in claim 1, characterized in that, The inflation chamber is also equipped with a vertical cylindrical airbag sleeve. The upper end of the airbag sleeve is sealed and fixed to the periphery of the lower surface of the piston plate, and the lower end is sealed and fixed to the side wall of the inflation chamber adjacent to the air inlet pipe and the inflation pipe.

4. The constant pressure gas source device for seed planting and emission as described in claim 1, characterized in that, A normally open contact inflation switch is provided at the bottom of the inflation chamber, protruding upwards. The contact inflation switch is connected to the air pump's switch control module and is used to control the air pump's operation. A push rod is vertically installed on one side of the upper end of the piston plate, and a normally open contact air shut-off switch is correspondingly installed at the upper end of the push rod. The contact air shut-off switch is connected to the air pump's switch control module and is used to control the air pump's shutdown.

5. The constant pressure gas source device for plant seed planting and emission as described in claim 4, characterized in that, The air pump's switch control module includes a power supply. An air pump control circuit is formed by connecting the power supply and the air pump in series. A single-pole double-throw switch is installed on the air pump control circuit. The single-pole double-throw switch has two stationary contacts and a conductive rod made of iron. The two stationary contacts are horizontally spaced apart. The lower end of the conductive rod is mounted between the two stationary contacts via a pivot, allowing its upper end to rotate left and right and connect with the two stationary contacts. The air pump control circuit is connected between one of the stationary contacts and the conductive rod. An inflation control electromagnet is located adjacent to the stationary contact connected to the air pump control circuit below it, and an air cut-off control electromagnet is located adjacent to the other stationary contact below it. An inflation control circuit is formed by connecting the power supply and the contact-type inflation switch, and the inflation control electromagnet is connected in series in the inflation control circuit. An air cut-off control circuit is formed by connecting the power supply and the contact-type air cut-off switch, and the air cut-off control electromagnet is connected in series in the air cut-off control circuit.

6. The constant pressure gas source device for plant seed planting and emission as described in claim 5, characterized in that, The contact-type inflation switch is positioned higher than the air inlet pipe and the inflation pipe.

7. The constant pressure gas source device for seed planting and emission as described in claim 5, characterized in that, The contact-type inflation switch includes a pressure block mounting groove protruding from the bottom of the inflation chamber. A pressure block is installed in the pressure block mounting groove, with its upper end protruding out of the groove. Support arms extend outward from both sides of the middle of the pressure block, with rollers at the outer ends of the support arms that abut against the inner sidewall of the pressure block mounting groove. A conductive contact is provided on the lower end face of the pressure block, and two horizontally spaced conductive contacts are correspondingly provided below the conductive contact. The two conductive contacts are connected in the inflation control circuit. A pressure block support spring is provided below each of the two support arms. The pressure block support spring is used to keep the conductive contact and the conductive contacts in a normally open state with a gap between them. The height of the upper end of the pressure block protruding from the pressure block mounting groove is greater than the distance between the conductive contact and the conductive contacts.

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