A fertilizer applicator

Abstract

The application relates to a fertilizer applicator and belongs to the technical field of fertilizer applicators, which comprises a supporting chassis, a fertilizer storage box is fixedly installed at the left side of the front top of the supporting chassis, a supporting frame is fixedly installed at the rear side of the fertilizer storage box, a booster cylinder is fixedly installed at the top of the supporting frame, two Z-shaped connecting vertical pipes are fixedly installed at the top of the booster cylinder, and a blocking assembly is arranged on the inner wall of the two Z-shaped connecting vertical pipes. The pressure compensation structure is arranged to actively supplement the pressure in the pipeline when the pressure in the pipeline is insufficient, to stabilize the negative pressure at the inlet of the venturi fertilizer injector or the fertilizer suction pump in real time, to effectively avoid the problem that the fertilizer suction amount is large or small due to pressure fluctuation of the conveying pump or complex pipeline arrangement, to enable the fertilizer liquid in the fertilizer mother tank to be continuously and uniformly sucked into the main pipeline, and to finally realize consistency of the fertilizer concentration at each fertilizer application point in the field, so that the stable demand for nutrients in the whole growth cycle of crops is met.

Description

Technical Field

[0001] This invention relates to the field of fertilizer applicator technology, specifically to a fertilizer applicator. Background Technology

[0002] A fertilizer applicator is an agricultural machine used to apply various fertilizers. It mainly consists of fertilizer bins, fertilizer dispensers, and other components. Some models are also equipped with fertilizer conveying, ditching, and covering devices. Its main goal is to achieve precise and efficient fertilization operations to replace the traditional manual fertilizer spreading method.

[0003] During the use of fertilizer applicators, the output pressure of the delivery pump often changes due to voltage fluctuations, pump wear, or pipe bends. Furthermore, the interlacing arrangement of multiple fertilizer suction pipes can cause mutual interference, resulting in unstable negative pressure at the venturi injector or fertilizer pump inlet. This problem directly causes the flow rate of the sucked fertilizer to fluctuate and the mixing ratio to become unbalanced, ultimately leading to uneven fertilization in the field and preventing crops from obtaining a stable supply of nutrients.

[0004] Existing technologies mostly use electronic sensors in conjunction with solenoid valves for closed-loop regulation, but they are costly and electronic components are prone to failure in humid and dusty field environments. Therefore, there is a need for a mechanical pressure adaptive fertilizer absorption device that is simple in structure, has a direct response, and does not require external electrical control. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fertilizer applicator. The device incorporates a pressure compensation structure to actively replenish pressure in the delivery pipeline when the pressure is insufficient, maintaining a stable negative pressure at the inlet of the Venturi fertilizer injector or fertilizer pump in real time. This device effectively avoids fluctuations in fertilizer absorption caused by pump pressure fluctuations or complex pipeline layouts, ensuring that the fertilizer solution in the fertilizer tank is continuously and evenly drawn into the main pipeline. Ultimately, this achieves consistent fertilizer concentration at all application points in the field, meeting the stable nutrient requirements of crops throughout their entire growth cycle.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fertilizer applicator, including a support base frame, wherein a fertilizer storage box is fixedly installed on the left side of the top front of the support base frame, and a support frame is fixedly installed on the rear side of the fertilizer storage box. A pressure boosting cylinder is fixedly installed on the top of the support frame, and two Z-shaped connecting vertical pipes are fixedly installed on the top of the pressure boosting cylinder. A blocking component is provided on the lower side of the inner wall of the two Z-shaped connecting vertical pipes. A sealing piston block is slidably installed in the middle of the inner wall of the pressure boosting cylinder, and a push plate is slidably installed on the lower side of the inner wall of the pressure boosting cylinder. An adjusting screw is rotatably installed at the bottom of the push plate. A compression spring is fixedly installed between the push plate and the sealing piston block. The fertilizer storage tank has a lid on the upper side of its inner wall, and an output cavity is opened inside the lid. A servo motor is embedded in the upper side of the inner wall of the output cavity. A stirring rod is fixedly installed at the output end of the servo motor. A crank block is set inside the output cavity on the upper side of the stirring rod wall. A push connecting rod is rotatably installed on the crank block. A groove block is rotatably installed on the end of the push connecting rod away from the crank block. An air pump is fixedly installed on the side of the groove block away from the crank block. A connecting pipe is fixedly installed on one end of the air pump. Two sets of stirring rods are fixedly installed on the lower side of the stirring rod wall.

[0007] Furthermore, a control cabinet is fixedly installed on the top front right side of the support base, and several Venturi fertilizer injectors are provided on the top of the support base and behind the control cabinet. A conveying pipeline is provided on the top of the support base and behind the fertilizer storage box.

[0008] Furthermore, one end of the delivery pipeline is connected to one end of several Venturi fertilizer injectors, and the delivery pipeline is connected to the fertilizer storage tank via a combined pipeline. The support frame is located between the Venturi fertilizer injectors and the delivery pipeline, and a flow start switch is provided on the side of the combined pipeline wall near the delivery pipeline. The delivery pipeline is also connected to external liquid delivery equipment to achieve fertilizer intake, mixing, and delivery. It should be noted that the specific structures of the control cabinet, Venturi fertilizer injectors, combined pipeline, fertilizer storage tank, and delivery pipeline involved in this application, except for the innovative points of this application, are all conventional technologies in the field and will not be described in detail here. The core innovation of this application lies in the described pressure adaptive feedback adjustment device and stirring and pressurizing linkage mechanism; other unmentioned parts can be implemented using existing technologies.

[0009] Furthermore, the booster cylinder is a cylindrical structure with a circular inner wall, and a pressure gauge is fixedly installed on one side of the top of the booster cylinder. The pressure gauge is located between two Z-shaped connecting vertical pipes, and a pressure relief valve is fixedly installed above the surface of the booster cylinder.

[0010] Furthermore, the blocking assembly includes a sealing ring fixedly installed on the lower side of the inner wall of the Z-shaped connecting vertical pipe. A perforated disc is fixedly installed on the inner wall of the Z-shaped connecting vertical pipe below the sealing ring. A connecting rod is slidably installed at the center of the perforated disc. A conical sealing cylinder is fixedly installed at the upper end of the connecting rod, and a return spring is fixedly installed at the bottom of the connecting rod.

[0011] Furthermore, the conical sealing cylinder has a conical structure with a small bottom and a large top, and the conical sealing cylinder is made of fluororubber. The upper part of the conical sealing cylinder is snapped into the upper side inside the sealing ring for sealing the sealing ring. The upper end of the return spring is fixedly connected to the bottom of the perforated disk.

[0012] Furthermore, the upper ends of both Z-shaped connecting vertical pipes are fixedly connected to the surface of the combined pipe, the rod wall of the adjusting screw is threadedly connected to the lower side of the inner wall of the pressure cylinder, and the surface of the pushing disc and the surface of the sealing piston block are fixedly installed with limit posts inside the compression spring, and the surface of the limit posts slides in contact with the inside of the compression spring.

[0013] Furthermore, the surface of the lid is fastened to the top of the fertilizer storage tank with bolts, further enhancing the stability of the lid during use. The lower end of the stirring rod extends through to the lower side of the inner wall of the fertilizer storage tank. The servo motor is electrically connected to the flow start switch. When the flow start switch detects fluid passing through, the servo motor is activated.

[0014] Furthermore, one end of the connecting pipe extends through to one side of the fertilizer storage tank surface, and the other end of the connecting pipe is fixedly connected to the upper side of the booster cylinder surface. The connecting pipe ensures that the gas delivered by the air pump is delivered into the booster cylinder. When the gas pressure in the booster cylinder increases, it will be protected by the pressure relief valve.

[0015] Furthermore, each set of stirring rods consists of three bent rods, which are curved. The bending directions of the two sets of bent rods are opposite in the vertical direction, and each bent rod has an integrally formed ball head structure at its end.

[0016] Compared with the prior art, the present invention provides a fertilizer applicator with the following beneficial effects: 1. This device, by setting up a pressure compensation structure, actively replenishes the pressure in the pipeline when the pressure in the pipeline is insufficient, thereby maintaining a stable negative pressure at the inlet of the Venturi fertilizer injector or fertilizer pump in real time. This device can effectively avoid the problem of fluctuating fertilizer absorption caused by pressure fluctuations in the delivery pump or complex pipeline layout. It ensures that the fertilizer solution in the fertilizer master tank can be continuously and evenly drawn into the main pipeline, ultimately achieving consistent fertilizer concentration at each fertilization point in the field and meeting the stable nutrient requirements of crops throughout their entire growth cycle.

[0017] 2. During startup, the device synchronously drives the stirring device inside the fertilizer storage structure to mix and stir the fertilizer solution. This stirring action can destroy the tiny crystal nuclei that have formed in the fertilizer solution and prevent them from growing into large particles and precipitating. At the same time, it can re-disperse high-concentration fertilizers that may separate into layers after long-term static storage, thereby significantly reducing the loss of effective components in the fertilizer solution caused by crystallization or precipitation, ensuring the consistency of the applied fertilizer quality, and fundamentally reducing the probability of crystals clogging fertilizer absorption branches, valve cores, or drip irrigation tapes.

[0018] 3. While stirring the fertilizer solution, the device converts the mechanical energy generated by stirring into pressure to supplement energy. It can maintain or increase the reserve of compensating pressure without the need for an additional independent power source, thereby reducing the overall energy consumption of the machine and improving the energy utilization efficiency of the device.

[0019] 4. The device activates both stirring and pressure replenishment functions simultaneously upon startup. The auxiliary pressure generated during stirring quickly increases the pipeline compensation pressure, allowing the negative pressure in the fertilizer suction branch to reach the target working range in a shorter time. This shortens the transition time from startup to stable output and avoids initial fertilizer deficiency or fertilization gaps caused by insufficient pressure during startup.

[0020] 5. The stirring structure of the device continuously prevents crystallization and precipitation. Combined with the pressure compensation structure, it stabilizes the pipeline pressure, so that the connection structure on the fertilizer suction branch pipe and the downstream drip irrigation belt and other weak links are no longer subjected to wear and blockage caused by sudden pressure changes or crystal impact. This significantly reduces the number of shutdowns for cleaning caused by blockages during equipment operation, correspondingly lowers maintenance costs, and effectively extends the service life of core components. Attached Figure Description

[0021] Figure 1 This is a front perspective view of the entire invention; Figure 2 This is a rear perspective view of the entire invention; Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 This is a three-dimensional cross-sectional view of the booster cylinder portion of the present invention; Figure 5 for Figure 5 Enlarged structural diagram of section B in the middle; Figure 6 This is a three-dimensional cross-sectional view of the Z-shaped connecting vertical pipe portion of the present invention; Figure 7 This is a vertical sectional perspective view of the box lid of the present invention; Figure 8 for Figure 7 Enlarged structural diagram of section C.

[0022] In the diagram: 1. Support frame; 2. Control cabinet; 201. Venturi fertilizer injector; 202. Delivery pipeline; 203. Combined pipeline; 204. Flow start switch; 3. Fertilizer storage tank; 4. Support frame; 5. Pressure booster cylinder; 501. Pressure gauge; 502. Pressure relief valve; 6. Z-type connecting riser. 7. Blocking assembly; 701. Sealing ring; 702. Perforated disc; 703. Connecting rod; 704. Conical sealing cylinder; 705. Return spring; 8. Sealing piston block; 801. Limiting post; 9. Pushing disc; 10. Adjusting screw; 11. Compression spring; 12. Box cover; 13. Output chamber; 14. Servo motor; 15. Stirring rod; 16. Crank block; 17. Pushing connecting rod; 18. Groove block; 19. Air pump; 20. Connecting pipe; 21. Stirring rod. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 8 A fertilizer applicator in this embodiment includes a support base frame 1, a fertilizer storage box 3, a support frame 4, a pressure cylinder 5, a combined pipe 203, and multiple Venturi fertilizer injectors 201. The supporting base 1 serves as the load-bearing substrate. A fertilizer storage tank 3 is fixedly installed on the left side of its top front, used to store liquid fertilizer or soluble fertilizer solution. A control cabinet 2 is fixedly installed on the right side of the top front of the supporting base 1. The control cabinet 2 can integrate conventional electrical control components such as PLCs and relays. Specific circuitry is known in the art and will not be described in detail here. Several Venturi fertilizer injectors 201 are located at the rear of the control cabinet 2, and a delivery pipeline network 202 is located at the rear of the fertilizer storage tank 3. One end of the network 202 is connected to one end of each Venturi fertilizer injector 201. The delivery network 202 is also connected to the fertilizer storage tank 3 through the combined pipe 203. The delivery network 202 is also connected to external liquid delivery equipment such as water pumps or irrigation mains to realize the intake, mixing and delivery of fertilizer. A flow start switch 204 is installed on the side of the combined pipe 203 near the delivery network 202 to detect whether there is fluid flowing in the combined pipe 203 and generate an electrical signal accordingly. A support frame 4 is fixedly installed on the support base 1 and located on the rear side of the fertilizer storage box 3. A pressure boosting cylinder 5 is fixedly installed on the top of the support frame 4. The pressure boosting cylinder 5 is a cylindrical structure with a circular inner wall. Two Z-shaped connecting vertical pipes 6 are fixedly installed on the top of the pressure boosting cylinder 5. The upper ends of the two Z-shaped connecting vertical pipes 6 are fixedly connected to the surface of the combined pipe 203, so that the pressure boosting cylinder 5 is connected to the combined pipe 203 through the Z-shaped connecting vertical pipes 6. A pressure gauge 501 is fixedly installed on one side of the top of the pressure boosting cylinder 5. The pressure gauge 501 is located between the two Z-shaped connecting vertical pipes 6 and is used to display the pressure value inside the pressure boosting cylinder 5 in real time. A pressure relief valve 502 is also fixedly installed above the surface of the pressure boosting cylinder 5. When the pressure inside the cylinder exceeds the safety threshold, it can automatically or manually release the pressure. Each Z-shaped connecting riser 6 has a blocking assembly 7 installed on the lower inner wall. The blocking assembly 7 includes a sealing ring 701 fixedly installed on the lower inner wall of the Z-shaped connecting riser 6, and a perforated disk 702 fixedly installed on the inner wall below the sealing ring 701. A connecting rod 703 is slidably installed at the center of the perforated disk 702. A conical sealing cylinder 704 is fixedly installed at the upper end of the connecting rod 703, and a return spring 705 is fixedly installed at the bottom of the connecting rod 703. The upper end of the return spring 705 is fixedly connected to the bottom of the perforated disk 702. The sealing cylinder 704 has a conical structure with a small bottom and a large top, and is made of fluororubber. Its upper conical surface can be inserted into the interior of the sealing ring 701 to form a seal. Under normal conditions, the return spring 705 pulls the connecting rod 703 downward, so that the conical sealing cylinder 704 fits against the sealing ring 701, and the Z-type connecting vertical pipe 6 is in the closed state. When the pressure inside the pressurizing cylinder 5 is too high, the high-pressure gas pushes the conical sealing cylinder 704 upward, so that it is away from the sealing ring 701, thereby ensuring that the liquid is pressurized in the pipeline and ensuring that the pressure of the liquid is stable. A sealing piston block 8 is slidably installed in the middle of the inner wall of the booster cylinder 5. The sealing piston block 8 is sealed with the cylinder wall, dividing the inner cavity of the booster cylinder 5 into an upper cavity and a lower cavity. A pusher disc 9 is slidably installed on the lower side of the inner wall of the booster cylinder 5. An adjusting screw 10 is rotatably installed at the bottom of the pusher disc 9. The rod wall of the adjusting screw 10 is threadedly connected to the lower side of the inner wall of the booster cylinder 5. A compression spring 11 is fixedly installed between the pusher disc 9 and the sealing piston block 8. In order to keep the spring stable, a limit post 801 is fixedly installed on the surface of the pusher disc 9 and the surface of the sealing piston block 8 inside the compression spring 11. The limit post 801 slides in contact with the inner ring of the compression spring 11 to prevent the spring from bending laterally. By rotating the adjusting screw 10, the upper and lower positions of the push plate 9 in the pressure cylinder 5 can be adjusted, thereby adjusting the pre-compression of the compression spring 11. When the pressure above the sealing piston block 8 is equal to the pressure delivered by the air pump 19, the gas in the upper cavity of the pressure cylinder 5 and the liquid pressure in the Z-shaped connecting vertical pipe 6 and the combined pipe 203 are mutually compressed. When the liquid pressure in the Z-shaped connecting vertical pipe 6 and the combined pipe 203 is less than the gas pressure, the gas will push the conical sealing cylinder 704 away from the sealing ring 701, and then the pressurized gas will be delivered to the combined pipe 203 to ensure the smooth absorption of fertilizer by the Venturi fertilizer injector 201 and achieve pressure compensation. When the pressure of the liquid in the Z-type connecting vertical pipe 6 and the combined pipe 203 is greater than the pressure of the gas, the liquid pressure pushes the conical sealing cylinder 704 close to the sealing ring 701, thereby closing the sealing ring 701 and preventing additional pressure. This ensures that the pressure in the pipe is sufficient to guarantee the smooth absorption of fertilizer by the Venturi fertilizer injector 201. The top of the fertilizer storage box 3 is provided with a box cover 12, which is fastened to the fertilizer storage box 3 by bolts. An output cavity 13 is opened inside the box cover 12. A servo motor 14 is embedded in the upper side of the inner wall of the output cavity 13. The servo motor 14 is electrically connected to the aforementioned flow start switch 204. When the flow start switch 204 detects that fluid is flowing through the combined pipe 203, the servo motor 14 is started. A stirring rod 15 is fixedly installed at the output end of the servo motor 14. The lower end of the stirring rod 15 passes through the cover 12 and extends to the lower side of the inner wall of the fertilizer storage tank 3. A crank block 16 is set on the upper side of the rod wall of the stirring rod 15 inside the output cavity 13. A push connecting rod 17 is rotatably installed on the crank block 16. A groove block 18 is rotatably installed on the end of the push connecting rod 17 away from the crank block 16. An air pump 19 is fixedly installed on the side of the groove block 18 away from the crank block 16. The air pump 19 is fixed inside the output cavity 13. Its piston rod is connected to the groove block 18, and the air outlet of the air pump 19 is fixedly connected to one side of the surface of the pressure cylinder 5 through the connecting pipe 20. When the stirring vertical rod 15 rotates, the crank block 16 drives the push connecting rod 17 and the groove block 18 to reciprocate, thereby driving the air pump 19 to continuously pump air and send air into the pressure cylinder 5 through the connecting pipe 20. This structure realizes that while stirring fertilizer, it can supplement the gas pressure of the pressure cylinder 5. A hole is opened on one side of the inner wall of the output chamber 13 to ensure the normal air intake operation of the air pump 19. Two sets of stirring rods 21 are fixedly installed on the lower side of the rod wall of the stirring vertical rod 15. Each set of stirring rods 21 consists of three bent rods. The bent rods are curved, and the bending directions of the two sets of bent rods are opposite in the vertical direction, that is, one set bends upward and the other set bends downward. The end of each bent rod is integrally formed with a ball head structure. This design can generate a turbulent flow effect of vertical convection during the stirring process, effectively preventing fertilizer crystallization and precipitation.

[0025] The working principle of the above embodiments is as follows: When the external liquid conveying equipment is started, water or water-fertilizer mixture flows through the conveying pipeline network 202 and the combined pipeline 203. The flow start switch 204 detects that fluid is passing through and immediately starts the servo motor 14. Servo motor 14 drives stirring rod 15 to rotate. Two sets of stirring rods 21 with opposite bending directions stir the fertilizer liquid in fertilizer storage tank 3, so that fertilizer particles or concentrated liquid are evenly dispersed, while preventing crystals from depositing at the bottom of the tank. The ball head structure can reduce scratch damage to the inner wall of the tank. While the stirring rod 15 rotates, the crank block 16, the push connecting rod 17 and the groove block 18 convert the rotational motion into the reciprocating linear motion of the air pump 19. The air pump 19 pumps air into the upper chamber of the pressure booster cylinder 5 through the connecting pipe 20. As air is continuously added, the gas pressure in the upper chamber of the pressure booster cylinder 5 gradually increases. This pressure squeezes the sealing piston block 8. The sealing piston block 8, in conjunction with the adjusting screw 10, can adjust the pressure in the pressure booster cylinder 5, thereby adjusting the pressure output. The gas in the upper chamber of the booster cylinder 5 is compressed by the liquid pressure in the Z-shaped connecting vertical pipe 6 and the combined pipe 203. When the liquid pressure in the Z-shaped connecting vertical pipe 6 and the combined pipe 203 is less than the gas pressure, the gas will push the conical sealing cylinder 704 away from the sealing ring 701. Then the pressurized gas will be delivered to the combined pipe 203 to ensure the smooth fertilizer absorption of the Venturi fertilizer injector 201 and achieve pressure compensation. When the liquid pressure in the Z-shaped connecting vertical pipe 6 and the combined pipe 203 is greater than the gas pressure, the liquid pressure pushes the conical sealing cylinder 704 closer to the sealing ring 701, thereby closing the sealing ring 701 and avoiding additional pressure. This ensures that the pressure in the pipeline is sufficient to ensure the smooth fertilizer absorption of the Venturi fertilizer injector 201. Because the negative pressure at the inlet of the Venturi fertilizer injector 201 is affected by the pressure of the main pipeline, once the pressure of the main pipeline is stabilized and compensated, the amount of fertilizer solution drawn by the Venturi fertilizer injector 201 from the fertilizer storage tank 3 remains uniform, thereby ensuring that the fertilizer concentration is consistent throughout the field. Through the aforementioned mechanical linkage and pressure feedback structure, this fertilizer applicator can automatically replenish pressure when the pipeline pressure is insufficient without relying on complex electronic sensors. At the same time, during the equipment startup process, fertilizer stirring and air replenishment in the pressurization cylinder 5 are carried out simultaneously, achieving anti-sedimentation and anti-clogging, significantly improving the uniformity of fertilization and the reliability of equipment operation.

[0026] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A fertilizer applicator, comprising a supporting base frame (1), characterized in that: A fertilizer storage box (3) is fixedly installed on the left side of the top front of the support base (1), and a support frame (4) is fixedly installed on the rear side of the fertilizer storage box (3) of the support base (1). A booster cylinder (5) is fixedly installed on the top of the support frame (4), and two Z-shaped connecting vertical pipes (6) are fixedly installed on the top of the booster cylinder (5). A blocking component (7) is provided on the lower side of the inner wall of the two Z-shaped connecting vertical pipes (6). A sealing piston block (8) is slidably installed in the middle of the inner wall of the booster cylinder (5), and a push plate (9) is slidably installed on the lower side of the inner wall of the booster cylinder (5). An adjusting screw (10) is rotatably installed at the bottom of the push plate (9). A compression spring (11) is fixedly installed between the push plate (9) and the sealing piston block (8). The fertilizer storage box (3) has a box cover (12) on the upper side of its inner wall, and an output cavity (13) is opened inside the box cover (12). A servo motor (14) is embedded in the upper side of the inner wall of the output cavity (13). A stirring rod (15) is fixedly installed at the output end of the servo motor (14). A crank block (16) is set inside the output cavity (13) on the upper side of the stirring rod (15). A push connecting rod (17) is rotatably installed on the crank block (16). A groove block (18) is rotatably installed at the end of the push connecting rod (17) away from the crank block (16). An air pump (19) is fixedly installed on the side of the groove block (18) away from the crank block (16). A connecting pipe (20) is fixedly installed at one end of the air pump (19). Two sets of stirring rods (21) are fixedly installed on the lower side of the stirring rod (15).

2. The fertilizer applicator according to claim 1, characterized in that: A control cabinet (2) is fixedly installed on the right side of the front of the top of the support base (1). Several Venturi fertilizer injectors (201) are set on the top of the support base (1) and on the rear side of the control cabinet (2). A conveying pipeline (202) is set on the top of the support base (1) and on the rear side of the fertilizer storage box (3).

3. A fertilizer applicator according to claim 2, characterized in that: One end of the delivery pipeline (202) is connected to one end of several Venturi fertilizer injectors (201) respectively. The delivery pipeline (202) is connected to the fertilizer storage tank (3) through the combined pipeline (203). The support frame (4) is set between the Venturi fertilizer injector (201) and the delivery pipeline (202). A flow start switch (204) is set on the side of the combined pipeline (203) near the delivery pipeline (202).

4. A fertilizer applicator according to claim 1, characterized in that: The booster cylinder (5) is a cylindrical structure with a circular inner wall, and a pressure gauge (501) is fixedly installed on one side of the top of the booster cylinder (5). The pressure gauge (501) is located between two Z-shaped connecting vertical pipes (6), and a pressure relief valve (502) is fixedly installed above the surface of the booster cylinder (5).

5. A fertilizer applicator according to claim 1, characterized in that: The blocking assembly (7) includes a sealing ring (701) fixedly installed on the lower side of the inner wall of the Z-shaped connecting vertical pipe (6). A perforated disc (702) is fixedly installed on the inner wall of the Z-shaped connecting vertical pipe (6) below the sealing ring (701). A connecting rod (703) is slidably installed at the center of the perforated disc (702). A conical sealing cylinder (704) is fixedly installed at the upper end of the connecting rod (703). A return spring (705) is fixedly installed at the bottom of the connecting rod (703).

6. A fertilizer applicator according to claim 5, characterized in that: The conical sealing cylinder (704) is a conical cylinder structure with a small bottom and a large top, and the conical sealing cylinder (704) is made of fluororubber. The upper part of the conical sealing cylinder (704) is snapped into the upper side inside the sealing ring (701) for sealing the sealing ring (701). The upper end of the return spring (705) is fixedly connected to the bottom of the perforated plate (702).

7. A fertilizer applicator according to claim 6, characterized in that: The upper ends of the two Z-shaped connecting vertical pipes (6) are fixedly connected to the surface of the combined pipe (203). The rod wall of the adjusting screw (10) is threadedly connected to the lower side of the inner wall of the pressure cylinder (5). The surface of the push plate (9) and the surface of the sealing piston block (8) are fixedly installed with limit posts (801) inside the compression spring (11), and the surface of the limit post (801) slides in contact with the inside of the compression spring (11).

8. A fertilizer applicator according to claim 3, characterized in that: The surface of the lid (12) is fastened to the top of the fertilizer storage box (3) by bolts. The lower end of the stirring rod (15) extends through to the lower side of the inner wall of the fertilizer storage box (3). The servo motor (14) is electrically connected to the flow start switch (204).

9. A fertilizer applicator according to claim 1, characterized in that: One end of the connecting pipe (20) extends through to one side of the surface of the fertilizer storage box (3), and one end of the connecting pipe (20) is fixedly connected to the upper side of the surface of the pressure cylinder (5).

10. A fertilizer applicator according to claim 1, characterized in that: Each set of stirring rods (21) consists of three bent rods, which are curved. The bending directions of the two sets of bent rods are opposite in the vertical direction, and each bent rod has an integrally formed ball head structure at its end.

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