Agricultural water and fertilizer integrated intelligent fertilization device and test method

Abstract

The present application relates to a kind of agricultural water and fertilizer integration intelligent fertilization device, including bearing bottom plate, walking mechanism, water storage tank, storage tank, feeding mechanism, metering pump, spray pump, fertilization port, rotational speed sensor and drive circuit, wherein bearing bottom plate is the plate structure with rectangular cross section, and the lower end surface of bearing bottom plate is connected with at least four walking mechanisms, and water storage tank, storage tank, feeding mechanism are connected with the upper end surface of bearing bottom plate, water storage tank, storage tank are communicated with feeding mechanism by metering pump, while water storage tank is also communicated with fertilization port by spray pump, and feeding mechanism is communicated with fertilization port by metering pump, and drive circuit is connected with the upper end surface of bearing bottom plate.The present application system has high degree of integration, and effectively improves water and fertilizer mixing control precision while effectively simplifying the structure of water and fertilizer management system, while effectively improving the total utilization rate of water resources.

Description

Technical Field

[0001] This invention relates to an integrated water and fertilizer application device, belonging to the technical field of agricultural and forestry production equipment. Background Technology

[0002] In agricultural and forestry production management, in order to improve water and fertilizer utilization, reduce water and fertilizer resource losses and costs, and avoid the defects of root burn due to excessive fertilizer and insufficient plant development due to insufficient fertilizer, a variety of integrated water and fertilizer equipment has been developed. For example, the "A quantitative fertilization integrated agricultural water and fertilizer equipment" with patent application number "201921923112.9" and the "A high-efficiency fertilization integrated agricultural water and fertilizer equipment" with patent application number "201921923111.4" have been developed. However, in actual use, it has been found that the current products often have the following problems: on the one hand, the equipment structure is often complex, and the operation, use and maintenance are inconvenient, and they are easily affected by the external environment; on the other hand, the functions are often limited, especially the ability to work in conjunction with external equipment, which greatly limits the flexibility and convenience of fertilization operations.

[0003] Therefore, in order to address the shortcomings in current practical work, it is necessary to develop an intelligent fertilization device and method for integrated water and fertilizer application in agriculture to meet the needs of practical work. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent fertilization device and method for integrating water and fertilizer in agriculture. This invention has a high degree of system integration and effectively improves the accuracy of water and fertilizer mixing control while simplifying the structure of the water and fertilizer management system. It also effectively improves the overall utilization rate of water resources. In addition, this invention has good scalability and can effectively meet the needs of independent mobile fertilization operations, as well as the need for long-distance fertilization operations with external conveying equipment.

[0005] To achieve the above objectives, the present invention provides an intelligent fertigation device and method for integrated water and fertilizer application in agriculture: An intelligent fertigation device integrating water and fertilizer application in agriculture includes a supporting base plate, a walking mechanism, a water storage tank, a storage tank, a feeding mechanism, a metering pump, a spray pump, a fertilizer inlet, a speed sensor, and a drive circuit. The supporting base plate is a rectangular plate structure. The lower end of the supporting base plate is connected to at least four walking mechanisms, and the supporting base plate is at least 15 cm above the ground. The water storage tank, storage tank, and feeding mechanism are all connected to the upper end of the supporting base plate. There is at least one water storage tank and one storage tank, distributed around the feeding mechanism. The water storage tank and storage tank are connected to the metering pump. The system is connected to the feeding mechanism, and the water storage tank is also connected to the fertilizer inlet via a spray pump. The feeding mechanism is also connected to the fertilizer inlet via a metering pump. There is at least one fertilizer inlet, which is connected to the lower end face of the supporting base plate via a connecting mechanism. The axis of the fertilizer inlet forms an angle of 30° to 90° with the lower end face of the supporting base plate. The number of speed sensors is the same as the number of walking mechanisms, and each walking mechanism is connected to at least one speed sensor. The drive circuit is connected to the upper end face of the supporting base plate and is electrically connected to the walking mechanism, the feeding mechanism, the metering pump, the spray pump, the fertilizer inlet, and the speed sensors.

[0006] Furthermore, the walking mechanism can be any one of wheeled, tracked, or walking mechanisms.

[0007] Furthermore, the feeding mechanism includes a mixing chamber, a conveying auger, a telescopic drive mechanism, a drive piston, a pressure sensor, and a stirring paddle. The mixing chamber is a cylindrical cavity structure with a rectangular axial cross-section. Its lower end face has a discharge trough with an inverted frustum structure. The bottom of the mixing chamber has at least two feeding ports and at least one discharge port coaxially distributed with it. The feeding ports are respectively connected to a water tank and a storage tank, and the discharge port is connected to a fertilizer inlet. The drive piston is located inside the mixing chamber, coaxially distributed with the mixing chamber, and abuts against the inner side of the mixing chamber. The system features a sliding connection, with the upper end face of the drive piston connected to the top of the mixing chamber via a telescopic drive mechanism. A pressure sensor is coaxially distributed on the lower end face of the drive piston. The conveying auger is coaxially distributed with the mixing chamber, and the lower half of the conveying auger is located inside the discharge port. The outer diameter of the conveying auger is 0-20 mm smaller than the inner diameter of the discharge port. The upper end face of the conveying auger is connected to at least one stirring paddle, and the stirring paddle is flush with the upper end face of the discharge trough. The conveying auger, telescopic drive mechanism, and pressure sensor are all electrically connected to the drive circuit.

[0008] Furthermore, the telescopic drive mechanism is any one of a hydraulic bladder belt, a pneumatic bladder belt, a gear and rack mechanism, an electric telescopic rod, a pneumatic telescopic rod, and a hydraulic telescopic rod.

[0009] Furthermore, the fertilizer application port includes a plowshare, a connecting column, a flexible drainage pipe, a connecting pipe head, a spray head, and a flexible spray pipe. The connecting column is a hollow columnar structure, with its upper end connected to a connecting mechanism and hinged to a supporting base plate via the connecting mechanism. The front side of the bottom of the connecting column is connected to the plowshare, which covers the connecting column, with its lower end face located at least 10 mm below the connecting column. The flexible spray pipe and flexible drainage pipe are located inside the connecting column, with their upper and lower ends each connected to a connecting pipe. The flexible drainage pipe is connected to the feeding mechanism via the connecting pipe head. Meanwhile, the connecting pipe head on the lower end of the flexible drainage pipe is located inside the connecting column and is flush with the lower end of the connecting column. The upper end of the flexible spray pipe is connected to the water storage tank via the connecting pipe head, and the lower end is connected to the spray head via the connecting pipe head. The spray head is located inside the plowshare and is connected to the outer side of the connecting column. The axis of the spray head intersects the axis of the connecting column at an angle of 15°–60°, and the intersection point is located below the lower end of the connecting column.

[0010] Furthermore, the spray head includes a rigid support tube and jet holes, wherein the rigid support tube is an arc-shaped tubular structure coaxially distributed with the connecting column, and its tube wall is provided with at least three jet holes, each jet hole being evenly distributed around the axis of the connecting column and located below the axis of the rigid support tube.

[0011] Furthermore, the connecting mechanism includes a swing mechanism, a main connecting arm, an auxiliary connecting arm, a linkage mechanism, an inclination sensor, and a soil covering wheel. The swing mechanism is connected to the bearing base plate and is connected to the main connecting arm and the auxiliary connecting arm respectively through the linkage mechanism. There is at least one main connecting arm and one auxiliary connecting arm, and one main connecting arm and one auxiliary connecting arm constitute a working group. The lower end face of the main connecting arm is connected to the outer side of the upper half of the connecting column of the fertilizer inlet. The lower end face of the auxiliary connecting arm is connected to 1-2 soil covering wheels. The soil covering wheels are located behind the fertilizer inlet and the distance between them and the fertilizer inlet is not less than 5 cm. At the same time, the lower surface of the soil covering wheel is located 0-10 cm below the lowest point of the fertilizer inlet. The number of inclination sensors is the same as the number of main connecting arms and auxiliary connecting arms, and there is one inclination sensor on each main connecting arm and auxiliary connecting arm. The swing mechanism and the inclination sensors are electrically connected to the drive circuit.

[0012] Furthermore, both the main connecting arm and the auxiliary connecting arm are at least two-stage telescopic rod structures, and the axes of the main connecting arm and the auxiliary connecting arm intersect at an angle of 10°–65°.

[0013] Furthermore, the driving circuit is a circuit system based on a programmable controller.

[0014] This invention features a high degree of system integration. While effectively improving the accuracy of water and fertilizer mixing control, it also simplifies the structure of the water and fertilizer management system and effectively increases the overall utilization rate of water resources. Furthermore, this invention has good scalability, effectively meeting the needs of independent mobile fertilization operations, and also enabling long-distance fertilization operations with external conveying equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 A schematic diagram of the stepping process for a dot matrix rotary penetration test; Figure 3 This is a schematic diagram of the mechanical model of the rotary shear probe; Detailed Implementation 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.

[0016] Please see Figure 1 As shown, an intelligent fertigation device integrating water and fertilizer application includes a supporting base plate 1, a walking mechanism 2, a water storage tank 3, a storage tank 4, a feeding mechanism 5, a metering pump 6, a spray pump 7, a fertilizer inlet 8, a speed sensor 9, and a drive circuit 10. The supporting base plate 1 is a rectangular plate structure. The lower end of the supporting base plate 1 is connected to at least four walking mechanisms 2, and the supporting base plate 1 is at least 15 cm above the ground. The water storage tank 3, the storage tank 4, and the feeding mechanism 5 are all connected to the upper end of the supporting base plate 1. There is at least one water storage tank 3 and one storage tank 4, distributed around the feeding mechanism 5. The water storage tank 3 and the storage tank 4 are connected to the metering pump. 6 is connected to the feeding mechanism 5. At the same time, the water storage tank 3 is also connected to the fertilizer inlet 8 through the spray pump 7. Meanwhile, the feeding mechanism 5 is connected to the fertilizer inlet 8 through the metering pump 6. There is at least one fertilizer inlet 8, which is connected to the lower end face of the supporting base plate 1 through the connecting mechanism 11. The axis of the fertilizer inlet 8 forms an angle of 30° to 90° with the lower end face of the supporting base plate 1. The number of speed sensors 9 is the same as the number of walking mechanisms 2, and each walking mechanism 2 is connected to at least one speed sensor 9. The drive circuit 10 is connected to the upper end face of the supporting base plate 1 and is electrically connected to the walking mechanism 2, the feeding mechanism 5, the metering pump 6, the spray pump 7, the fertilizer inlet 8, and the speed sensor 9.

[0017] In this embodiment, the metering pump 6 and the spray pump 7 are both connected to the supporting base plate, and the metering pump 6, the spray pump 7, the water storage tank 3, the storage tank 4, the feeding mechanism 5 and the fertilizer inlet 8 are interconnected through the multi-way valve 12, and the multi-way valve 12 is electrically connected to the drive circuit.

[0018] In this embodiment, the walking mechanism 2 is any one of wheeled, tracked, and walking mechanisms.

[0019] It should be noted that the feeding mechanism 5 includes a mixing chamber 51, a conveying auger 52, a telescopic drive mechanism 53, a drive piston 54, a pressure sensor 55, and a stirring paddle 56. The mixing chamber 51 is a cylindrical cavity structure with a rectangular axial cross-section. Its lower end face is provided with a discharge trough 57 with an inverted frustum structure. At the same time, the bottom of the mixing chamber 51 is provided with at least two feeding ports 58 and at least one discharge port 59 coaxially distributed with it. The feeding ports 58 are respectively connected to the water tank 3 and the storage tank 4, and the discharge port 59 is connected to the fertilizer inlet 8. The drive piston 54 is located inside the mixing chamber 51, coaxially distributed with the mixing chamber 51, and abuts against the inner side of the mixing chamber 51. The drive piston 54 is connected to the top of the mixing chamber 51 via a telescopic drive mechanism 53. A pressure sensor 55 is coaxially distributed on the lower end of the drive piston 54. The conveying auger 52 is coaxially distributed with the mixing chamber 51, and the lower half of the conveying auger 52 is located inside the discharge port 59. The outer diameter of the conveying auger 52 is 0-20 mm smaller than the inner diameter of the discharge port 59. The upper end of the conveying auger 52 is connected to at least one stirring paddle 56, and the stirring paddle 56 is flush with the upper end of the discharge trough 57. The conveying auger 52, the telescopic drive mechanism 53, and the pressure sensor 55 are all electrically connected to the drive circuit 10.

[0020] To improve the control accuracy of the mixing operation, a temperature and humidity sensor 501 can be installed in the mixing chamber 51, and the temperature and humidity sensor 501 is electrically connected to the drive circuit 10.

[0021] The telescopic drive mechanism 53 can be any one of a hydraulic bladder belt, a pneumatic bladder belt, a gear and rack mechanism, an electric telescopic rod, a pneumatic telescopic rod, and a hydraulic telescopic rod.

[0022] As specifically noted, the fertilizer inlet 8 includes a plowshare 83, a connecting column 84, a flexible drainage pipe 85, a connecting pipe head 86, a spray head 82, and a flexible spray pipe 81. The connecting column 84 is a hollow columnar structure, with its upper end connected to the connecting mechanism 11 and hinged to the supporting base plate 1 via the connecting mechanism 11. The front side of the bottom of the connecting column 84 is connected to the plowshare 83, which covers the connecting column 84, with its lower end face located at least 10 mm below the connecting column 84. The flexible spray pipe 85 and the flexible drainage pipe 86 are located inside the connecting column 84, with their upper and lower ends both connected to a connecting... The pipe head 86 is connected, and the upper end face of the flexible drainage pipe 85 is connected to the feeding mechanism 5 through the connecting pipe head 86. At the same time, the connecting pipe head 86 of the lower end face of the flexible drainage pipe 85 is located inside the connecting column 84 and is flush with the lower end face of the connecting column 84. The upper end face of the flexible spray pipe 81 is connected to the water storage tank 3 through the connecting pipe head 86, and the lower end face is connected to the spray head 82 through the connecting pipe head 86. The spray head 82 is located inside the plowshare 83 and is connected to the outer side of the connecting column 84. At the same time, the axis of the spray head 82 intersects the axis of the connecting column 84 and forms an angle of 15° to 60°. The intersection point is located below the lower end face of the connecting column 84.

[0023] In this embodiment, the spray head 82 includes a rigid support tube 871 and jet holes 872. The rigid support tube 871 is an arc-shaped tubular structure coaxially distributed with the connecting column 84. Its tube wall is provided with at least three jet holes 872. Each jet hole 872 is evenly distributed around the axis of the connecting column 84 and located below the axis of the rigid support tube 871.

[0024] Furthermore, the connecting mechanism 11 includes a swing mechanism 111, a main connecting arm 112, an auxiliary connecting arm 113, a linkage mechanism 114, an inclination sensor 115, and a soil covering wheel 116. The swing mechanism 111 is connected to the bearing base plate 1 and is connected to the main connecting arm 112 and the auxiliary connecting arm 113 respectively through the linkage mechanism 114. There is at least one main connecting arm 112 and one auxiliary connecting arm 113, and one main connecting arm 112 and one auxiliary connecting arm 113 constitute a working group. The lower end face of the main connecting arm 112 is connected to the upper half of the connecting post 84 of the fertilizer inlet 8. The outer side of the auxiliary connecting arm 113 is connected to 1-2 covering wheels 116. The covering wheels 116 are located behind the fertilizer inlet 8 and the distance between them and the fertilizer inlet 8 is not less than 5 cm. At the same time, the lower surface of the covering wheel 116 is located 0-10 cm below the lowest point of the fertilizer inlet 8. The number of tilt sensors 115 is the same as the number of main connecting arms 112 and auxiliary connecting arms 113. Each main connecting arm 112 and auxiliary connecting arm 113 has one tilt sensor 115. The swing mechanism 111 and the tilt sensors 115 are electrically connected to the drive circuit 10.

[0025] In this embodiment, both the main connecting arm 112 and the auxiliary connecting arm 113 are at least two-stage telescopic rod structures, and the axes of the main connecting arm 112 and the auxiliary connecting arm 113 intersect at an angle of 10° to 65°.

[0026] In this embodiment, the driving circuit 10 is a circuit system based on a programmable controller.

[0027] This invention operates in two states: standalone operation and online operation. Independent Operation: First, irrigation water and fertilizer are added to the water tank and storage tank respectively. Then, the supporting base plate is connected to a third-party traction and power equipment. Driven by the third-party traction and power equipment, it travels along the set fertilization route via the walking mechanism. During the journey, fertilization is carried out in the following two ways depending on the type of fertilizer: Method 1: The fertilizer in the storage tank is transported to the feeding mechanism by the metering pump. Then, it is pressurized and transported by the driving piston and driving auger set in the feeding mechanism. The fertilizer is then lowered by the metering pump and transported to the fertilizer inlet and discharged into the soil through the fertilizer inlet. While pressurizing and transporting fertilizer, the soil is plowed open by the fertilizer inlet to provide application points for the fertilizer. Simultaneously, water in the storage tank is metered by a metering pump, pressurized by a spray pump, and sprayed onto the soil and fertilizer along with the fertilizer through the spray nozzles at the fertilizer inlet. Method 2: Water in the storage tank and fertilizer in the storage tank are precisely mixed and added to the feeding mechanism using a metering pump. The feeding mechanism then thoroughly mixes and pressurizes the water and fertilizer before applying them through the fertilizer inlet, thus achieving simultaneous fertilization and irrigation. During the fertilization process, on the one hand, the speed sensor detects the travel speed of the walking mechanism, and the drive circuit adjusts the operating power of the metering pump and the spraying pump according to the travel speed, so that the amount of fertilizer applied is synchronized with the travel speed of the equipment, avoiding the defects of over-fertilization or insufficient fertilizer application; on the other hand, after the fertilization and irrigation are completed at the fertilization port, the soil covering wheel of the connecting mechanism covers the soil at the fertilization point excavated by the plowshare, thereby reducing water evaporation and fertilizer loss, thus achieving the purpose of reducing water and fertilizer loss, improving fertilization efficiency and reducing costs.

[0028] Online operation: When operating in this mode, first add irrigation water and fertilizer to the water storage tank and storage tank respectively. Then connect the fertilizer inlet to the external delivery pipeline equipment. Finally, add the water in the water storage tank and the fertilizer in the storage tank to the feeding mechanism after precise mixing by the metering pump. The feeding mechanism then fully mixes and pressurizes the water and fertilizer. Finally, the fertilizer is discharged through the fertilizer inlet and pressurized and guided to the working point by the external delivery pipeline equipment.

[0029] This invention features a high degree of system integration. While effectively improving the accuracy of water and fertilizer mixing control, it also simplifies the structure of the water and fertilizer management system and effectively increases the overall utilization rate of water resources. Furthermore, this invention has good scalability, effectively meeting the needs of independent mobile fertilization operations, and also enabling long-distance fertilization operations with external conveying equipment.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted broadly. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this invention or invention according to the specific circumstances.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent fertigation device for integrated water and fertilizer application in agriculture, characterized in that, The intelligent fertigation device for integrated agricultural water and fertilizer application includes a base plate, a walking mechanism, a water tank, a storage tank, a feeding mechanism, a metering pump, a spray pump, a fertilizer inlet, a speed sensor, and a drive circuit. The base plate is a rectangular plate structure, with its lower end connected to at least four walking mechanisms. The base plate is at least 15 cm above the ground. The water tank, storage tank, and feeding mechanism are all connected to the upper end of the base plate. There is at least one water tank and one storage tank, distributed around the feeding mechanism. The water tank and storage tank are connected to the metering pump. The system is connected to the feeding mechanism, and the water storage tank is also connected to the fertilizer inlet via a spray pump. The feeding mechanism is connected to the fertilizer inlet via a metering pump. There is at least one fertilizer inlet, which is connected to the lower end face of the supporting base plate via a connecting mechanism. The axis of the fertilizer inlet forms an angle of 30° to 90° with the lower end face of the supporting base plate. The number of speed sensors is the same as the number of walking mechanisms, and each walking mechanism is connected to at least one speed sensor. The drive circuit is connected to the upper end face of the supporting base plate and is electrically connected to the walking mechanism, the feeding mechanism, the metering pump, the spray pump, the fertilizer inlet, and the speed sensors.

2. The intelligent fertigation device for integrated water and fertilizer application according to claim 1, characterized in that, The walking mechanism can be any one of wheeled, tracked, or walking mechanisms.

3. The intelligent fertigation device for integrated water and fertilizer application according to claim 1, characterized in that, The feeding mechanism includes a mixing chamber, a conveying auger, a telescopic drive mechanism, a drive piston, a pressure sensor, and a stirring paddle. The mixing chamber is a cylindrical cavity with a rectangular axial cross-section. Its lower end face has a discharge trough with an inverted frustum structure. The bottom of the mixing chamber has at least two feeding ports and at least one discharge port coaxially distributed with it. The feeding ports are connected to a water tank and a storage tank, respectively, and the discharge port is connected to a fertilizer inlet. The drive piston is located inside the mixing chamber, coaxially distributed with the mixing chamber, and abuts against and slides against the inner side of the mixing chamber. The upper end face of the driving piston is connected to the top of the mixing chamber via a telescopic driving mechanism. A pressure sensor is coaxially distributed on the lower end face of the driving piston. The conveying auger is coaxially distributed with the mixing chamber, and the lower half of the conveying auger is located inside the discharge port. The outer diameter of the conveying auger is 0-20 mm smaller than the inner diameter of the discharge port. The upper end face of the conveying auger is connected to at least one stirring paddle, and the stirring paddle is flush with the upper end face of the discharge trough. The conveying auger, telescopic driving mechanism, and pressure sensor are all electrically connected to the driving circuit.

4. The intelligent fertigation device for integrated water and fertilizer application according to claim 3, characterized in that, The telescopic drive mechanism is any one of the following: hydraulic bladder belt, pneumatic bladder belt, gear and rack mechanism, electric telescopic rod, pneumatic telescopic rod, and hydraulic telescopic rod.

5. The intelligent fertigation device for integrated water and fertilizer application according to claim 1, characterized in that, The fertilizer inlet includes a plowshare, a connecting column, a flexible drainage pipe, a connecting pipe head, a spray head, and a flexible spray pipe. The connecting column is a hollow columnar structure, with its upper end connected to a connecting mechanism and hinged to a supporting base plate via the connecting mechanism. The front side of the bottom of the connecting column is connected to the plowshare, which covers the connecting column, with its lower end face located at least 10 mm below the connecting column. The flexible spray pipe and flexible drainage pipe are located inside the connecting column, with their upper and lower ends each connected to a connecting pipe head. The upper end face of the flexible drainage pipe is connected to the feeding mechanism through the connecting pipe head. At the same time, the connecting pipe head of the lower end face of the flexible drainage pipe is located inside the connecting column and is flush with the lower end face of the connecting column. The upper end face of the flexible spray pipe is connected to the water storage tank through the connecting pipe head, and the lower end face is connected to the spray head through the connecting pipe head. The spray head is located inside the plowshare and is connected to the outer side of the connecting column. At the same time, the axis of the spray head intersects the axis of the connecting column and forms an angle of 15° to 60°, and the intersection point is located below the lower end face of the connecting column.

6. The intelligent fertigation device for integrated water and fertilizer application according to claim 5, characterized in that, The spray head includes a rigid support tube and jet holes. The rigid support tube is an arc-shaped tubular structure coaxially distributed with the connecting column. Its tube wall is provided with at least three jet holes, each jet hole being evenly distributed around the axis of the connecting column and located below the axis of the rigid support tube.

7. The intelligent fertigation device for integrated water and fertilizer application according to claim 1, characterized in that, The connecting mechanism includes a swing mechanism, a main connecting arm, an auxiliary connecting arm, a linkage mechanism, an inclination sensor, and a soil covering wheel. The swing mechanism is connected to the bearing base plate and is connected to the main connecting arm and the auxiliary connecting arm respectively through the linkage mechanism. There is at least one main connecting arm and one auxiliary connecting arm, and one main connecting arm and one auxiliary connecting arm constitute a working group. The lower end face of the main connecting arm is connected to the outer side of the upper half of the connecting column of the fertilizer inlet. The lower end face of the auxiliary connecting arm is connected to 1-2 soil covering wheels. The soil covering wheels are located behind the fertilizer inlet and the distance between them and the fertilizer inlet is not less than 5 cm. At the same time, the lower surface of the soil covering wheel is located 0-10 cm below the lowest point of the fertilizer inlet. The number of inclination sensors is the same as the number of main connecting arms and auxiliary connecting arms, and there is one inclination sensor on each main connecting arm and auxiliary connecting arm. The swing mechanism and the inclination sensors are electrically connected to the drive circuit.

8. The intelligent fertigation device for integrated water and fertilizer application according to claim 7, characterized in that, Both the main connecting arm and the auxiliary connecting arm are at least two-stage telescopic rod structures, and the axes of the main connecting arm and the auxiliary connecting arm intersect at an angle of 10° to 65°.

9. The intelligent fertigation device for integrated water and fertilizer application according to claim 7, characterized in that, The drive circuit is a circuit system based on a programmable controller.

Images