Pneumatic jet type targeted fertilization device

Abstract

A pneumatic injection type targeted fertilization device comprises a rack, a fertilizer box, an air source assembly, an intermittent air injection mechanism, a mechanical touch recognition mechanism and a controller are mounted on the rack, a furrow opener is mounted at the bottom of the rack, a mounting opening is formed in the bottom of the fertilizer box, a fertilizer apparatus is mounted at the mounting opening and connected with a fertilizer discharge pipe, and the fertilizer discharge pipe is located in the furrow opener; in conclusion, according to the design of the invention, crop identification, the precision of fertilizer feeding and the cavitation effect of the fertilizer are considered, and through combination of mechanical and electronic control, the automation and intelligence level of fertilization is improved, the precision and efficiency of fertilization are improved, the waste of the fertilizer is reduced, and the fertilizer absorption rate of the crop 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 fertilization device. Background Art

[0002] Air jet targeted fertilization is an air blow hole fertilization technology that identifies the plant position during the process of targeted hole fertilization in intertillage and uses the high-pressure gas of the air pump to spray fertilizer from the fertilizer outlet and drop quickly. There are few related machines for intertillage air spray and air blow hole fertilization, and the existing machines have poor stability and reliability. In the process of identifying plants, the recognition effect is poor and there are problems of missed fertilizer. In the process of fertilization, the fertilizer dispersion and hole formation are often poor, which leads to low corn fertilizer absorption rate and a large amount of fertilizer is not fully utilized. Summary of the invention

[0003] The 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 fertilization device 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 in the furrow opener;

[0006] The mechanical touch recognition mechanism is arranged at the front side of the frame, and the mechanical touch recognition mechanism comprises a vertical shaft, an identification outer shell and a vertical tube body. The vertical tube body is installed on the top of the identification outer shell body, the vertical shaft penetrates 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 installed on the inner wall of the identification outer shell body, a first bevel gear is installed on the vertical shaft, an arc-shaped touch rod is fixed at the lower end of the vertical shaft, one side of the identification outer shell body is open, the touch rod extends outward from the side of the identification outer shell body, a reset spring is also arranged in the identification outer shell body, and both ends of the reset spring are connected to the inner wall of the identification outer shell body and the touch rod;

[0007] The fertilizer discharging device comprises a fertilizer discharging outer shell, a fertilizer discharging groove wheel and a stepper motor. The fertilizer discharging outer shell is installed at the installation opening at the bottom of the fertilizer box. The fertilizer discharging groove wheel is located in the fertilizer discharging outer shell. A plurality of fertilizer storage grooves are arranged on the periphery of the fertilizer discharging groove wheel. The stepper motor is used to drive the fertilizer discharging groove wheel to rotate. A semicircular top plate is arranged on the top of the fertilizer discharging outer shell. An air nozzle is opened 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-discharging fertilizer groove. A blanking opening is opened on the side wall of the fertilizer discharging outer shell. The blanking opening is connected to the pre-discharging fertilizer groove. The upper end of the fertilizer discharging pipe is connected to the blanking opening.

[0008] The intermittent air spray mechanism is arranged on the semicircular top plate, and the intermittent air spray mechanism comprises an air chamber shell and a transmission long rod. The bottom of the air chamber shell is open, and the air chamber shell is installed on the semicircular top plate and is located directly above the air nozzle. The connection between the bottom of the air chamber shell and the semicircular top plate is sealed. A partition is fixed in the air chamber shell, and the partition divides the inner cavity of the air chamber shell into an upper chamber and a lower chamber. A vent is opened on the partition, and 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 part and a thin lower part. Under the elastic force of the compression spring, the upper part of the sealing plug abuts against 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 arranged 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, 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 a second bevel gear meshing with the first bevel gear is provided at the end of the transmission long rod, and the other end of the transmission long rod extends into the lower chamber of the air chamber housing, a cam is provided at the end of the transmission long rod, 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 control.

[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 respectively connected to the air pump and the electromagnetic air valve.

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

[0013] Furthermore, the fertilizer amount adjusting device includes a lifting adjustment member and a plurality of fertilizer adjusting bottom support members, all of which are respectively located in the fertilizer storage trough of the fertilizer discharge trough wheel, and the fertilizer adjusting bottom support members can move up and down in the fertilizer storage trough, and the top surface of the fertilizer adjusting bottom support member is a slope structure, and the lifting adjustment member is used to drive all of the fertilizer adjusting bottom support members to move up and down synchronously in the fertilizer storage trough.

[0014] Further, the lifting and lowering adjustment member includes a synchronous belt and several groups of pushing members, the outer surface of the fertilizer discharge groove wheel is evenly distributed with several convex ridges, the fertilizer storage tank is a cavity between two adjacent convex 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 installed at the bottom end of the fertilizer discharge groove wheel by rotation, the core sleeve has an internal thread, the adjusting stud is threadedly connected in the core sleeve, the fertilizer adjustment bottom support member is installed at the upper end of the adjusting stud by rotation, 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, 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 invention has the following beneficial effects: the pneumatic jet targeted fertilization device of the 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 by 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 a controller. The controller commands the stepper motor to rotate a certain angle, so that the fertilizer discharging groove wheel rotates 60°, and the next fertilizer carrying the fertilizer is placed on the ground. The fertilizer storage tank rotates to correspond to the feeding port; on the other hand, physical touch opens the vent through the transmission long rod, and the high-pressure gas of the gas source assembly is sprayed into the lower chamber through the vent, and then sprayed into the pre-fertilizer tank through the gas nozzle. The high-pressure gas sprays the fertilizer in the pre-fertilizer tank, so that it quickly forms holes and falls through the fertilizer pipe; the design of the present invention takes into account crop identification, the accuracy of fertilizer delivery and the hole-forming 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 It 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 It is a connection diagram of the intermittent air spray mechanism, the mechanical touch recognition mechanism and the air source assembly;

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

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

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

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

[0026] Fig. 9 is a cross-sectional view of a fertilizer dispenser;

[0027] Fig.10 It is a structural schematic diagram of a fertilizer dispensing device;

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

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0030] The present invention is further described in detail below in conjunction with embodiments.

[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 comprises 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 in the furrow opener 4;

[0033] The mechanical touch recognition mechanism is arranged on the front side of the frame 1, such as Figure 5As shown, the mechanical touch identification mechanism includes a vertical shaft 8, an identification outer shell 9 and a vertical tube 10. The vertical tube 10 is installed on the top of the identification outer shell 9. The vertical shaft 8 penetrates the vertical tube 10. A rotary encoder 11 is installed on the upper end of the vertical tube 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 installed 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. The touch rod 13 extends outward from the side of the identification outer shell 9. A reset spring 14 is also arranged in the identification outer shell 9. Both 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 Fig. 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 installation port 5 at the bottom of the fertilizer box 2. The fertilizer discharge groove wheel 16 is located in the fertilizer discharge outer shell 15. Six fertilizer storage grooves 18 are arranged 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 arranged 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 drop opening 22 is opened on the side wall of the fertilizer discharge outer shell 15. The drop opening 22 is connected to the pre-fertilizer discharge groove 21. The upper end of the fertilizer discharge pipe 7 is connected to the drop opening 22.

[0035] The intermittent air spray mechanism is arranged on the semi-dome plate 19. 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. The partition 25 is provided with a vent hole 28. The upper chamber 26 is provided with a vent hole 28. A square plate 29 is fixed in the chamber 26, and a sealing plug 31 is connected to the bottom surface of the square plate 29 through a compression spring 30. The sealing plug 31 is a variable diameter structure with a thick upper part and a thin lower part. Under the elastic force of the compression spring 30, the upper part of the sealing plug 31 abuts against the partition plate 25 and blocks the vent 28, and the lower part of the sealing plug 31 extends into the lower chamber 27 through the vent 28; an air source air inlet 32 ​​is provided on the top of the air chamber housing 23, and the air source assembly is connected to the air source air inlet 32;

[0036] A round 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 round tube 33 through a bearing. One end of the transmission long rod 24 extends into the vertical tube body 10, and a second bevel gear 34 meshing with the first bevel gear 12 is provided at the end of the transmission long rod 24. 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 fertilization device of the present embodiment is mainly composed 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 box 6. The fertilizer box 2 is used to hold fertilizers, the furrow opener 4 performs furrowing operations, and the mechanical touch identification mechanism identifies crops by 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 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 tank 21 through the air nozzle 20. The high-pressure gas sprays the fertilizer in the pre-fertilizer tank 21, so that it falls into a hole quickly through the fertilizer pipe 7; the specific working process of the pneumatic jet targeted fertilization 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, and 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 discharge groove wheel 16 to rotate 60°, and the next fertilizer storage tank 18 carrying fertilizer is rotated 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 gas source assembly enters the upper chamber 26, and then sprays into the lower chamber 27 through the vent 28, and then sprays into the pre-fertilizer tank 21 through the gas nozzle 20. The high-pressure gas sprays the fertilizer in the pre-fertilizer tank 21, so that it quickly forms a hole and falls through the fertilizer pipe 7. When the touch rod 13 slides over the crop, the reset spring 14 pulls the touch rod 13 to reset, and the compression spring 30 pushes the sealing plug 31 to reset and re-block the vent 28, waiting for the next operation, and finally realizing the gas 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 the fertilizer adjustment bottom supporting members 40 are respectively located in the fertilizer storage tank 18 of the fertilizer discharge groove 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 the fertilizer adjustment bottom supporting members 40 to move up and down synchronously 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 outer surface of the fertilizer discharging 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 members include a core sleeve 43 and an adjusting stud 44. The core sleeve 43 is rotatably mounted on the bottom end of the fertilizer discharging groove wheel 16. The core sleeve 43 has an internal thread. The adjusting stud 44 is threadedly connected in the core sleeve 43. The fertilizer adjusting bottom support member 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 fertilizer storage capacity of the fertilizer storage tank 18 is as follows: the fertilizer adjusting bottom supporting member 40 is located in the fertilizer storage tank 18. By changing the position of the fertilizer adjusting 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 adjusting bottom supporting member 40 is adjusted by a lifting adjusting 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 have axial movement. Therefore, the adjusting stud 44 can drive the fertilizer adjusting bottom supporting member 40 to move up and down, and finally realize the synchronous adjustment of the position of all the fertilizer adjusting bottom supporting members 40 in the fertilizer storage tank 18.

[0045] It should be noted that, in this article, 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 inherent to such process, method, article or apparatus.

[0046] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present 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 spraying mechanism, a mechanical touch identification 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 in the furrow opener; The mechanical touch recognition mechanism is arranged at the front side of the frame, and the mechanical touch recognition mechanism comprises a vertical shaft, an identification outer shell and a vertical tube body. The vertical tube body is installed on the top of the identification outer shell body, the vertical shaft penetrates 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 installed on the inner wall of the identification outer shell body, a first bevel gear is installed on the vertical shaft, an arc-shaped touch rod is fixed at the lower end of the vertical shaft, one side of the identification outer shell body is open, the touch rod extends outward from the side of the identification outer shell body, a reset spring is also arranged in the identification outer shell body, and both ends of the reset spring are connected to the inner wall of the identification outer shell body and the touch rod; The fertilizer discharging device comprises a fertilizer discharging outer shell, a fertilizer discharging groove wheel and a stepper motor. The fertilizer discharging outer shell is installed at the installation opening at the bottom of the fertilizer box. The fertilizer discharging groove wheel is located in the fertilizer discharging outer shell. A plurality of fertilizer storage grooves are arranged on the periphery of the fertilizer discharging groove wheel. The stepper motor is used to drive the fertilizer discharging groove wheel to rotate. A semicircular top plate is arranged on the top of the fertilizer discharging outer shell. An air nozzle is opened 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-discharging fertilizer groove. A blanking opening is opened on the side wall of the fertilizer discharging outer shell. The blanking opening is connected to the pre-discharging fertilizer groove. The upper end of the fertilizer discharging pipe is connected to the blanking opening. The intermittent air spray mechanism is arranged on the semicircular top plate, and the intermittent air spray mechanism comprises an air chamber shell and a transmission long rod. The bottom of the air chamber shell is open, and the air chamber shell is installed on the semicircular top plate and is located directly above the air nozzle. The connection between the bottom of the air chamber shell and the semicircular top plate is sealed. A partition is fixed in the air chamber shell, and the partition divides the inner cavity of the air chamber shell into an upper chamber and a lower chamber. A vent is opened on the partition, and 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 part and a thin lower part. Under the elastic force of the compression spring, the upper part of the sealing plug abuts against 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 arranged 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, 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 a second bevel gear meshing with the first bevel gear is provided at the end of the transmission long rod, and the other end of the transmission long rod extends into the lower chamber of the air chamber housing, a cam is provided at the end of the transmission long rod, 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 control.

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. An electromagnetic air valve is arranged on the high-pressure air pipe. 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 quantity regulating device, and the fertilizer quantity regulating device is used for adjusting 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 adjusting device includes a lifting adjustment member and a plurality of fertilizer adjusting bottom supporting members, all of which are respectively located in the fertilizer storage tank of the fertilizer discharge groove wheel, and the fertilizer adjusting bottom supporting members can move up and down in the fertilizer storage tank, and the top surface of the fertilizer adjusting bottom supporting member is a slope structure, and the lifting adjustment member is used to drive all of the fertilizer adjusting bottom supporting members to move up and down synchronously in the fertilizer storage tank.

5. The pneumatic jet targeted fertilization device according to claim 4, characterized in that: The lifting and lowering adjustment member includes a synchronous belt and several groups of pushing members. The outer surface of the fertilizer discharging groove wheel is uniformly provided with several convex ridges. The fertilizer storage tank is a cavity between two adjacent convex 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 installed at the bottom end of the fertilizer discharging groove wheel by rotation. The core sleeve has an internal thread. The adjusting stud is threadedly connected in the core sleeve. The fertilizer adjusting bottom support member is installed at the upper end of the adjusting stud by rotation. The upper end of the core sleeve is provided 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, 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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