Pneumatic jet targeted fertilization device

Abstract

The pneumatic jet targeted fertilizing device includes a frame, on which a fertilizer box, an air source assembly, an intermittent air spray mechanism, a mechanical touch recognition mechanism and a controller are installed. A furrow opener is installed at the bottom of the frame. A mounting opening is provided at the bottom of the fertilizer box. A fertilizer discharger is installed at the mounting opening. The fertilizer discharger is connected to a fertilizer discharge pipe, which is located inside the furrow opener. In summary, the design of the present invention takes into account crop identification, the accuracy of fertilizer placement and the cavitation effect of fertilizer. Through the combination of mechanical and electronic control, the automation and intelligence level of fertilization is improved, the accuracy and efficiency of fertilization are improved, fertilizer waste is reduced, and the fertilizer absorption rate of crops is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery, and in particular relates to a pneumatic jet targeted fertilizing device. Background Art

[0002] Air-jet targeted fertilization involves identifying plant locations during tillage and applying targeted fertilizer in holes. This technique uses high-pressure air from an air pump to spray fertilizer rapidly from a fertilizer outlet. Existing equipment for tillage and air-jet fertilization is limited, and existing equipment suffers from poor stability and reliability. This can lead to poor plant identification and missed fertilizer applications. Fertilizer dispersion and poor hole formation often occur during fertilization, resulting in low fertilizer absorption rates in corn and significant amounts of unused fertilizer. Summary of the Invention

[0003] The present invention aims to provide a pneumatic jet targeted fertilization device to solve the technical problems of poor stability of existing pneumatic jet targeted fertilization machines, fertilizer leakage, poor fertilizer dispersion and poor cavitation.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The pneumatic jet targeted fertilizing device includes a frame, on which a fertilizer box, an air source assembly, an intermittent air spray mechanism, a mechanical touch recognition mechanism, and a controller are installed. A furrow opener is installed at the bottom of the frame. A mounting opening is opened at the bottom of the fertilizer box. A fertilizer discharger is installed at the mounting opening. The fertilizer discharger is connected to a fertilizer discharge pipe, and the fertilizer discharge pipe is located inside the furrow opener.

[0006] The mechanical touch recognition mechanism is arranged on the front side of the frame. The mechanical touch recognition mechanism includes a vertical shaft, an identification shell and a vertical tube body. The vertical tube body is installed on the top of the identification shell body. The vertical shaft passes through the vertical tube body. A rotary encoder is installed on the upper end of the vertical tube body. The upper end of the vertical shaft is connected to the rotary encoder. The lower end of the vertical shaft is rotatably mounted on the inner wall of the identification shell body. A first bevel gear is installed on the vertical shaft. An arc-shaped touch rod is fixed to the lower end of the vertical shaft. One side of the identification shell body is open. The touch rod extends outward from the side of the identification shell body. A reset spring is also provided in the identification shell body. The two ends of the reset spring are connected to the inner wall of the identification shell body and the touch rod.

[0007] The fertilizer discharger includes a fertilizer discharge shell, a fertilizer discharge groove wheel, and a stepper motor. The fertilizer discharge shell is installed at the installation opening at the bottom of the fertilizer box. The fertilizer discharge groove wheel is located in the fertilizer discharge shell. A plurality of fertilizer storage grooves are provided on the periphery of the fertilizer discharge groove wheel. The stepper motor is used to drive the fertilizer discharge groove wheel to rotate. A semicircular top plate is provided on the top of the fertilizer discharge shell. An air nozzle is provided on the semicircular top plate. One of the fertilizer storage grooves is located directly below the air nozzle, and the fertilizer storage groove is a pre-fertilizer discharge groove. A blanking port is provided on the side wall of the fertilizer discharge shell. The blanking port is connected to the pre-fertilizer discharge groove, and the upper end of the fertilizer discharge pipe is connected to the blanking port.

[0008] The intermittent air spraying mechanism is arranged on the semidome plate, and the intermittent air spraying mechanism comprises an air chamber shell and a transmission long rod, the bottom of the air chamber shell is open, the air chamber shell is mounted on the semidome plate and is located directly above the air nozzle, the connection between the bottom of the air chamber shell and the semidome plate is sealed, a partition is fixed in the air chamber shell, the partition divides the inner cavity of the air chamber shell into an upper chamber and a lower chamber, a vent is provided on the partition, a square plate is fixed in the upper chamber, the bottom surface of the square plate is connected to a sealing plug through a compression spring, the sealing plug is a variable diameter structure with a thick upper portion and a thin lower portion, under the elastic force of the compression spring, the upper part of the sealing plug contacts the partition and blocks the vent, and the lower part of the sealing plug extends into the lower chamber through the vent; an air source inlet is provided on the top of the air chamber shell, and the air source assembly is connected to the air source inlet;

[0009] A round tube is fixed between the fertilizer box and the air chamber housing, and a transmission long rod is rotatably installed in the round tube through a bearing. One end of the transmission long rod extends into the vertical tube body, and the end of the transmission long rod is provided with a second bevel gear meshing with the first bevel gear. The other end of the transmission long rod extends into the lower chamber of the air chamber housing, and the end of the transmission long rod is provided with a cam, and the lower end of the sealing plug contacts the outer edge of the cam;

[0010] The controller is respectively connected with the rotary encoder, the stepping motor and the air source assembly.

[0011] Furthermore, the air source assembly includes an air source and an air pump. The air pump is connected to the air source, and the air pump is connected to the air inlet of the air source through a high-pressure air pipe. An electromagnetic air valve is provided on the high-pressure air pipe, and the controller is connected to the air pump and the electromagnetic air valve respectively.

[0012] Furthermore, the fertilizer discharger is also provided with a fertilizer amount regulating device, which is used to adjust the fertilizer storage capacity of the fertilizer storage tank.

[0013] Furthermore, the fertilizer amount adjusting device includes a lifting adjusting part and several fertilizer adjusting bottom supporting parts. All the fertilizer adjusting bottom supporting parts are respectively located in the fertilizer storage trough of the fertilizer discharge trough wheel, and the fertilizer adjusting bottom supporting parts can move up and down in the fertilizer storage trough. The top surface of the fertilizer adjusting bottom supporting part is a sloped structure. The lifting adjusting part is used to drive all the fertilizer adjusting bottom supporting parts to move up and down synchronously in the fertilizer storage trough.

[0014] Furthermore, the lifting and adjusting member includes a synchronous belt and several groups of pushing members, the surface of the fertilizer discharge groove wheel is evenly distributed with several ridges, the fertilizer storage tank is a cavity between two adjacent ridges, all the pushing members are respectively located in the fertilizer storage tank, the pushing member includes a core sleeve and an adjusting stud, the core sleeve is rotatably mounted on the bottom end of the fertilizer discharge groove wheel, the core sleeve has an internal thread, the adjusting stud is threadedly connected in the core sleeve, the fertilizer adjusting bottom support is rotatably mounted on the upper end of the adjusting stud, the upper end of the core sleeve is sleeved with a small pulley, and the lower end surface of the core sleeve is provided with a square hole;

[0015] A through hole is formed at the lower end of each cam, and a synchronous belt passes through the through holes of all the cams, and the synchronous belt is connected to all the small pulleys.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the pneumatic jet targeted fertilizing device of the present invention is mainly composed of a fertilizer box, a furrow opener, an air source assembly, a mechanical touch identification mechanism, an intermittent air spray device and a fertilizer dispenser. The fertilizer box is used to hold fertilizer, the furrow opener performs furrowing operations, and the mechanical touch identification mechanism identifies crops through physical touch. Then, on the one hand, the mechanical touch identification information is detected by a rotary encoder, and the rotary encoder transmits the information to the controller. The controller commands the stepper motor to rotate a certain angle, so that the fertilizer discharge groove wheel rotates 60 degrees, and the next one carrying fertilizer is moved to the next position. The fertilizer storage tank rotates to correspond to the discharge port; on the other hand, physical touch opens the air vent through the long transmission rod, and the high-pressure gas of the air source assembly is sprayed into the lower chamber through the air vent, and then sprayed into the pre-fertilizer trough through the air nozzle. The high-pressure gas sprays out the fertilizer in the pre-fertilizer trough, so that it quickly forms holes and falls through the fertilizer discharge pipe; the design of the present invention takes into account crop identification, the accuracy of fertilizer delivery and the cavitation effect of fertilizer. Through the combination of mechanical and electronic control, the automation and intelligence level of fertilization is improved, the accuracy and efficiency of fertilization are improved, the waste of fertilizer is reduced, and the fertilizer absorption rate of crops is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is an axonometric view of the pneumatic jet targeted fertilization device of the present invention;

[0019] Figure 2 This is an axonometric view from another perspective of the pneumatic jet targeted fertilization device of the present invention.

[0020] Figure 3 A top view of the present invention;

[0021] Figure 4 This is a connection diagram of the intermittent air spray mechanism, mechanical touch recognition mechanism, and air source assembly;

[0022] Figure 5 It is a structural diagram of a mechanical touch recognition mechanism;

[0023] Figure 6 This is a schematic diagram of the position of the intermittent air spray mechanism in the fertilizer box;

[0024] Figure 7 It is a structural diagram of the intermittent air spray mechanism;

[0025] Figure 8 It is a cross-sectional view of the fertilizer dispenser located in the fertilizer box;

[0026] Figure 9 It is a cross-sectional view of the fertilizer dispenser;

[0027] Figure 10 It is a structural diagram of a fertilizer dispenser;

[0028] Figure 11 This is an exploded view of the fertilizer amount adjustment device located on the fertilizer discharge wheel. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0030] The present invention is described in further detail below with reference to the examples.

[0031] like Figure 1-8 As shown, a specific embodiment 1 of a pneumatic jet targeted fertilization device provided by the present invention is:

[0032] The pneumatic jet targeted fertilization device includes a frame 1, on which a fertilizer box 2, an air source assembly, an intermittent air spray mechanism, a mechanical touch recognition mechanism, and a controller 3 are installed. A furrow opener 4 is installed at the bottom of the frame 1. A mounting opening 5 is opened at the bottom of the fertilizer box 2. A fertilizer discharger 6 is installed at the mounting opening 5. The fertilizer discharger 6 is connected to a fertilizer discharge pipe 7, and the fertilizer discharge pipe 7 is located inside the furrow opener 4.

[0033] The mechanical touch recognition mechanism is arranged on the front side of the frame 1, as shown in FIG. Figure 5As shown, the mechanical touch recognition mechanism includes a vertical shaft 8, an identification outer shell 9 and a vertical tube body 10. The vertical tube body 10 is installed at the top of the identification outer shell 9. The vertical shaft 8 passes through the vertical tube body 10. A rotary encoder 11 is installed at the upper end of the vertical tube body 10. The upper end of the vertical shaft 8 is connected to the rotary encoder 11. The lower end of the vertical shaft 8 is rotatably mounted on the inner wall of the identification outer shell 9. A first bevel gear 12 is installed on the vertical shaft 8. An arc-shaped touch rod 13 is fixed to the lower end of the vertical shaft 8. One side of the identification outer shell 9 is open, and the touch rod 13 extends outward from the side of the identification outer shell 9. A reset spring 14 is also provided in the identification outer shell 9. The two ends of the reset spring 14 are connected to the inner wall of the identification outer shell 9 and the touch rod 13.

[0034] like Figure 9 As shown, the fertilizer discharger 6 includes a fertilizer discharge outer shell 15, a fertilizer discharge groove wheel 16 and a stepper motor 17. The fertilizer discharge outer shell 15 is installed at the mounting port 5 at the bottom of the fertilizer box 2. The fertilizer discharge groove wheel 16 is located inside the fertilizer discharge outer shell 15. Six fertilizer storage grooves 18 are provided on the periphery of the fertilizer discharge groove wheel 16. The stepper motor 17 is used to drive the fertilizer discharge groove wheel 16 to rotate. A semicircular top plate 19 is provided on the top of the fertilizer discharge outer shell 15. An air nozzle 20 is opened on the semicircular top plate 19. One of the fertilizer storage grooves 18 is located directly below the air nozzle 20, and the fertilizer storage groove 18 is a pre-fertilizer discharge groove 21. A blanking port 22 is opened on the side wall of the fertilizer discharge outer shell 15. The blanking port 22 is connected to the pre-fertilizer discharge groove 21, and the upper end of the fertilizer discharge pipe 7 is connected to the blanking port 22.

[0035] The intermittent air spray mechanism is arranged on the semi-dome plate 19, as shown in FIG. Figure 7 As shown, the intermittent air spray mechanism includes an air chamber housing 23 and a transmission long rod 24. The bottom of the air chamber housing 23 is open. The air chamber housing 23 is mounted on the semi-dome plate 19 and is located directly above the air nozzle 20. The connection between the bottom of the air chamber housing 23 and the semi-dome plate 19 is sealed. A partition 25 is fixed in the air chamber housing 23. The partition 25 divides the inner cavity of the air chamber housing 23 into an upper chamber 26 and a lower chamber 27. A vent 28 is opened on the partition 25. The upper chamber A square plate 29 is fixed in the chamber 26. The bottom surface of the square plate 29 is connected to a sealing plug 31 via a compression spring 30. The sealing plug 31 has a variable diameter structure with a thicker top and a thinner bottom. Under the elastic force of the compression spring 30, the upper portion of the sealing plug 31 contacts the partition 25 and blocks the vent 28. The lower portion of the sealing plug 31 extends into the lower chamber 27 through the vent 28. An air source inlet 32 ​​is provided at the top of the air chamber housing 23. The air source assembly is connected to the air source inlet 32.

[0036] A circular tube 33 is fixed between the fertilizer box 2 and the air chamber housing 23, and a transmission long rod 24 is rotatably installed in the circular tube 33 through a bearing. One end of the transmission long rod 24 extends into the vertical tube body 10, and the end of the transmission long rod 24 is provided with a second bevel gear 34 meshing with the first bevel gear 12. The other end of the transmission long rod 24 extends into the lower chamber 27 of the air chamber housing 23, and a cam 35 is provided at the end of the transmission long rod 24. The lower end of the sealing plug 31 contacts the outer edge of the cam 35;

[0037] The controller 3 is respectively connected to the rotary encoder 11, the stepper motor 17 and the air source assembly, and the controller 3 can be a single-chip microcomputer; the air source assembly includes an air source 36 and an air pump 37, the air pump 37 is connected to the air source 36, and the air pump 37 is connected to the air source inlet 32 ​​through a high-pressure air pipe 38, and the high-pressure air pipe 38 is provided with an electromagnetic air valve 39, and the controller 3 is respectively connected to the air pump 37 and the electromagnetic air valve 39.

[0038] The pneumatic jet targeted fertilizing device of this embodiment mainly consists of a fertilizer box 2, a furrow opener 4, an air source assembly, a mechanical touch identification mechanism, an intermittent air spray device and a fertilizer dispenser 6. The fertilizer box 2 is used to hold fertilizer, the furrow opener 4 performs furrowing operations, and the mechanical touch identification mechanism identifies crops through physical touch. Then, on the one hand, the mechanical touch identification information is detected by the rotary encoder 11, and the rotary encoder 11 transmits the information to the controller 3. The controller 3 commands the stepper motor 17 to rotate a certain angle, so that the fertilizer discharge groove wheel 16 rotates 60°, and the next fertilizer storage tank 18 carrying fertilizer is rotated to the corresponding drop port 22; on the other hand, the physical touch opens the vent 28 through the transmission long rod 24, and the high-pressure gas of the air source assembly is sprayed into the lower chamber 27 through the vent 28, and then sprayed into the pre-fertilizer discharge tank 21 through the air nozzle 20. The high-pressure gas sprays the fertilizer in the pre-fertilizer discharge tank 21, so that it quickly forms a hole and falls through the fertilizer discharge pipe 7; the specific working process of the pneumatic jet targeted fertilizing device is described in detail below:

[0039] First, the frame 1 can be installed on the tractor through the buckle 48. During the forward movement of the frame 1, the furrow opener 4 enters the soil to open furrows, and the touch rod 13 can touch the crop. When the touch rod 13 touches the crop, as the frame 1 moves forward, the crop pushes the touch rod 13, and the touch rod 13 links the vertical shaft 8 to rotate a certain angle, the reset spring 14 is stretched, and the vertical shaft 8 rotates to drive the rotary encoder 11 and the first bevel gear 12 to rotate. The rotary encoder 11 transmits the rotation information to the controller 3. The controller 3 commands the stepper motor 17 to rotate 60°, and the stepper motor 17 drives the fertilizer groove wheel 16 to rotate 60°, rotating the next fertilizer storage tank 18 carrying fertilizer to the bottom of the air nozzle 20; at the same time, the first bevel gear 12 and the second bevel gear 34 meshing transmission, the second bevel gear 34 drives the transmission long rod 24 to rotate, and the cam 35 is set at the end of the transmission long rod 24. Since the outer edge of the cam 35 is irregular, as the cam 35 rotates, the cam 35 pushes the sealing plug 31 upward, the vent 28 opens, and the high-pressure gas of the air source assembly enters the upper chamber 26, and then is sprayed into the lower chamber 27 through the vent 28, and then is sprayed into the pre-fertilizer trough 21 through the air nozzle 20. The high-pressure gas sprays out the fertilizer in the pre-fertilizer trough 21, so that it quickly forms holes and falls through the fertilizer pipe 7. When the touch rod 13 slides over the crop, the return spring 14 pulls the touch rod 13 to reset, and the compression spring 30 pushes the sealing plug 31 to reset and re-seal the vent 28, waiting for the next operation, and finally realizing the air spray targeted hole fertilization operation.

[0040] like Figure 9-11 As shown, a specific embodiment 2 of a pneumatic jet targeted fertilization device provided by the present invention is:

[0041] The difference from specific embodiment 1 is that, in this embodiment, a fertilizer amount adjusting device is further provided on the fertilizer discharger 6, and the fertilizer amount adjusting device is used to adjust the fertilizer storage capacity of the fertilizer storage tank 18; the fertilizer amount adjusting device includes a lifting adjustment member and a plurality of fertilizer adjustment bottom supporting members 40, all of which are respectively located in the fertilizer storage tank 18 of the fertilizer discharge trough wheel 16, and the fertilizer adjustment bottom supporting members 40 can move up and down in the fertilizer storage tank 18, and the top surface of the fertilizer adjustment bottom supporting member 40 is a slope structure, and the lifting adjustment member is used to drive all of the fertilizer adjustment bottom supporting members 40 to move synchronously up and down in the fertilizer storage tank 18.

[0042] The lifting and lowering adjustment member includes a synchronous belt 41 and several groups of pushing members. The surface of the fertilizer discharge groove wheel 16 is evenly distributed with several ridges 42. The fertilizer storage tank 18 is a cavity between two adjacent ridges 42. All the pushing members are respectively located in the fertilizer storage tank 18. The pushing member includes a core sleeve 43 and an adjusting stud 44. The core sleeve 43 is rotatably mounted on the bottom end of the fertilizer discharge groove wheel 16. The core sleeve 43 has an internal thread. The adjusting stud 44 is threadedly connected to the core sleeve 43. The fertilizer adjustment bottom support 40 is rotatably mounted on the upper end of the adjusting stud 44. The upper end of the core sleeve 43 is sleeved with a small pulley 45. The lower end surface of the core sleeve 43 is provided with a square hole 46.

[0043] A through hole 47 is formed at the lower end of each cam 35 , and the synchronous belt 41 passes through the through holes 47 of all the cams 35 , and the synchronous belt 41 is connected to all the small pulleys 45 .

[0044] The principle of the fertilizer amount regulating device for adjusting the storage capacity of the fertilizer storage tank 18 is as follows: the fertilizer regulating bottom supporting member 40 is located in the fertilizer storage tank 18. By changing the position of the fertilizer regulating bottom supporting member 40 in the fertilizer storage tank 18, the fertilizer storage capacity of the fertilizer storage tank 18 can be changed, and the fertilizer regulating bottom supporting member 40 is adjusted by the lifting regulating member. Specifically, a screwdriver or other tool is inserted into the square hole 46 at the lower end of one of the core sleeves 43, and the core sleeve 43 is rotated. The core sleeve 43 drives the small pulley 45 to rotate, and the small pulley 45 can pull the other small pulleys 45 to rotate synchronously through the synchronous belt 41. Finally, all the core sleeves 43 rotate synchronously, and the adjusting stud 44 is threadedly installed in the core sleeve 43. As the core sleeve 43 rotates, the adjusting stud 44 is bound to move axially. Therefore, the adjusting stud 44 can drive the fertilizer regulating bottom supporting member 40 to move up and down, and finally realize the synchronous adjustment of the position of all fertilizer regulating bottom supporting members 40 in the fertilizer storage tank 18.

[0045] It should be noted that, in this document, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. Pneumatic jet targeted fertilization device, characterized by: The machine comprises a frame, on which a fertilizer box, an air source assembly, an intermittent air spray mechanism, a mechanical touch recognition mechanism and a controller are installed; a furrow opener is installed at the bottom of the frame; a mounting opening is opened at the bottom of the fertilizer box; a fertilizer discharger is installed at the mounting opening; the fertilizer discharger is connected to a fertilizer discharge pipe, and the fertilizer discharge pipe is located inside the furrow opener; The mechanical touch recognition mechanism is arranged on the front side of the frame. The mechanical touch recognition mechanism includes a vertical shaft, an identification shell and a vertical tube body. The vertical tube body is installed on the top of the identification shell body. The vertical shaft passes through the vertical tube body. A rotary encoder is installed on the upper end of the vertical tube body. The upper end of the vertical shaft is connected to the rotary encoder. The lower end of the vertical shaft is rotatably mounted on the inner wall of the identification shell body. A first bevel gear is installed on the vertical shaft. An arc-shaped touch rod is fixed to the lower end of the vertical shaft. One side of the identification shell body is open. The touch rod extends outward from the side of the identification shell body. A reset spring is also provided in the identification shell body. The two ends of the reset spring are connected to the inner wall of the identification shell body and the touch rod. The fertilizer discharger includes a fertilizer discharge shell, a fertilizer discharge groove wheel, and a stepper motor. The fertilizer discharge shell is installed at the installation opening at the bottom of the fertilizer box. The fertilizer discharge groove wheel is located in the fertilizer discharge shell. A plurality of fertilizer storage grooves are provided on the periphery of the fertilizer discharge groove wheel. The stepper motor is used to drive the fertilizer discharge groove wheel to rotate. A semicircular top plate is provided on the top of the fertilizer discharge shell. An air nozzle is provided on the semicircular top plate. One of the fertilizer storage grooves is located directly below the air nozzle, and the fertilizer storage groove is a pre-fertilizer discharge groove. A blanking port is provided on the side wall of the fertilizer discharge shell. The blanking port is connected to the pre-fertilizer discharge groove, and the upper end of the fertilizer discharge pipe is connected to the blanking port. The intermittent air spraying mechanism is arranged on the semidome plate, and the intermittent air spraying mechanism comprises an air chamber shell and a transmission long rod, the bottom of the air chamber shell is open, the air chamber shell is mounted on the semidome plate and is located directly above the air nozzle, the connection between the bottom of the air chamber shell and the semidome plate is sealed, a partition is fixed in the air chamber shell, the partition divides the inner cavity of the air chamber shell into an upper chamber and a lower chamber, a vent is provided on the partition, a square plate is fixed in the upper chamber, the bottom surface of the square plate is connected to a sealing plug through a compression spring, the sealing plug is a variable diameter structure with a thick upper portion and a thin lower portion, under the elastic force of the compression spring, the upper part of the sealing plug contacts the partition and blocks the vent, and the lower part of the sealing plug extends into the lower chamber through the vent; an air source inlet is provided on the top of the air chamber shell, and the air source assembly is connected to the air source inlet; A round tube is fixed between the fertilizer box and the air chamber housing, and a transmission long rod is rotatably installed in the round tube through a bearing. One end of the transmission long rod extends into the vertical tube body, and the end of the transmission long rod is provided with a second bevel gear meshing with the first bevel gear. The other end of the transmission long rod extends into the lower chamber of the air chamber housing, and the end of the transmission long rod is provided with a cam, and the lower end of the sealing plug contacts the outer edge of the cam; The controller is respectively connected with the rotary encoder, the stepping motor and the air source assembly.

2. The pneumatic jet targeted fertilization device according to claim 1, characterized in that: The air source assembly includes an air source and an air pump. The air pump is connected to the air source. The air pump is connected to the air inlet of the air source through a high-pressure air pipe. The high-pressure air pipe is provided with an electromagnetic air valve. The controller is connected to the air pump and the electromagnetic air valve respectively.

3. The pneumatic jet targeted fertilization device according to claim 1, characterized in that: The fertilizer discharger is also provided with a fertilizer amount regulating device, which is used to adjust the fertilizer storage capacity of the fertilizer storage tank.

4. The pneumatic jet targeted fertilization device according to claim 3, characterized in that: The fertilizer amount adjustment device includes a lifting adjustment part and several fertilizer adjustment bottom supporting parts. All the fertilizer adjustment bottom supporting parts are respectively located in the fertilizer storage trough of the fertilizer discharge trough wheel, and the fertilizer adjustment bottom supporting parts can move up and down in the fertilizer storage trough. The top surface of the fertilizer adjustment bottom supporting part is a slope structure. The lifting adjustment part is used to drive all the fertilizer adjustment bottom supporting parts to move up and down synchronously in the fertilizer storage trough.

5. The pneumatic jet targeted fertilization device according to claim 4, characterized in that: The lifting and lowering adjustment parts include a synchronous belt and several groups of pushing parts. The surface of the fertilizer discharge groove wheel is evenly distributed with several ridges. The fertilizer storage tank is a cavity between two adjacent ridges. All the pushing parts are respectively located in the fertilizer storage tank. The pushing parts include a core sleeve and an adjusting stud. The core sleeve is rotatably mounted on the bottom end of the fertilizer discharge groove wheel. The core sleeve has an internal thread. The adjusting stud is threadedly connected in the core sleeve. The fertilizer adjustment bottom support is rotatably mounted on the upper end of the adjusting stud. The upper end of the core sleeve is sleeved with a small pulley. The lower end surface of the core sleeve is provided with a square hole. A through hole is formed at the lower end of each cam, and a synchronous belt passes through the through holes of all the cams, and the synchronous belt is connected to all the small pulleys.

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