Automatic control fertilizer head system suitable for northern arid region

Abstract

The application belongs to the field of agricultural irrigation technology, and particularly relates to an automatic fertilizer control head system suitable for arid regions in the north, which aims to solve the problems of root invasion, uncontrolled water and fertilizer mixing concentration and field water source silt blockage in underground drip irrigation. The system comprises a stirring container, a conveying container, a regulation mechanism, a centrifugal filtering mechanism and an irrigation mechanism. When the concentration of fertilizer solution is too high, the stirring resistance is increased to push the stirring blade upwards, the magnetic coupling feeding mechanism is separated through rope transmission, the feeding is automatically paused, time is provided for dissolution, the tangential water inlet design of the centrifugal filtering mechanism makes the water flow rotate and separate the silt to the bottom collecting cylinder, the outer pipe of the irrigation pipeline is provided with a telescopic inner pipe, the inner pipe is extended during irrigation, the irrigation holes on the inner pipe are exposed to perform irrigation, the inner pipe is retracted during non-irrigation, and the irrigation holes are closed, so that the root invasion is avoided. The system can automatically control the feeding speed to prevent the solution from being pasty, filter the water source silt and prevent the root blockage in underground drip irrigation.

Description

Technical Field

[0001] This invention relates to the field of agricultural irrigation technology, and in particular to an automatic fertilizer control head system suitable for arid regions in northern China. Background Technology

[0002] In farmland irrigation and fertilization, fertigation technology is widely used. Its core principle is to mix solid fertilizer with water to create liquid fertilizer, which is then directly delivered to the crop root zone, reducing fertilizer waste and water consumption. However, current fertigation equipment on the market still has the following problems in use: 1. Existing water and fertilizer mixing irrigation equipment mostly adopts the method of manually adding fertilizer and mechanically mixing it. There is a problem that it is difficult to accurately control the amount of fertilizer added. When solid fertilizer is added too quickly, it is easy to cause the local concentration of liquid fertilizer to be too high. This not only affects crop absorption, but may also cause the fertilizer to be deposited inside the equipment due to insufficient dissolution, resulting in pipe blockage, reduced mixing efficiency and other malfunctions. 2. Meanwhile, the water source for farmland irrigation is mostly taken from field ditches or groundwater, which contains a large amount of sand, stones and other impurities. If it is directly injected into the mixing container and mixed with fertilizer, the impurities will enter the irrigation pipes with the liquid fertilizer. Long-term accumulation can easily cause pipe blockage and increase equipment maintenance costs. Existing filtration devices are mostly screen filters, which need to be disassembled and cleaned regularly. The operation is cumbersome, and the screen is easily blocked by impurities, affecting irrigation efficiency. 3. In the underground irrigation process, traditional underground irrigation pipes directly open irrigation holes. The irrigation holes are exposed to the soil for a long time, and crop roots can easily penetrate into the pipe through the irrigation holes, causing pipe blockage, resulting in uneven irrigation. In some areas, crops cannot get enough water and fertilizer, which affects crop growth. 4. The existing equipment lacks a linkage control mechanism between fertilizer application and mixing / dissolving, and cannot automatically adjust the fertilizer application rhythm according to the concentration of liquid fertilizer. It requires real-time manual monitoring and intervention, which increases the intensity of manual labor and is difficult to meet the needs of large-scale farmland operations. Summary of the Invention

[0003] The purpose of this invention is to solve the shortcomings of existing fertilizer application and dissolution speeds that lead to uncontrolled concentration, water source sediment clogging of pipes, and root invasion and clogging of irrigation holes in underground drip irrigation systems. Therefore, this invention proposes an automatic fertilizer control head system suitable for arid northern regions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An automatic fertilizer control head system suitable for arid northern regions includes: A mixing container with a U-shaped bracket installed on its top, a motor I mounted on the U-shaped bracket, and a mixing shaft extending into the mixing container being fixedly connected to the output shaft of the motor I. A conveying container is fixed to one side of the mixing container by a bracket. The bottom of the conveying container is provided with a discharge pipe that extends into the mixing container. The conveying container is provided with an auger for conveying solid fertilizer. A control mechanism is provided between the stirring container and the conveying container. The control mechanism includes a mounting ring slidably sleeved on the stirring shaft and an inclined stirring blade fixed to the outer wall of the mounting ring, as well as a magnetic coupling transmission assembly for driving the auger. The magnetic coupling transmission assembly can be triggered to disengage when the stirring blade drives the mounting ring to move axially due to increased stirring resistance, thereby stopping the auger from feeding. A centrifugal filtration mechanism, connected to the stirring container, is used to separate sand particles in the water when water is added to the stirring container; A water pump, the inlet of which is connected to the stirring container; An irrigation unit includes a buried hollow pipe connected to the outlet of a water pump, an irrigation pipe connected to the hollow pipe, and multiple outer pipes connected to the irrigation pipe. An irrigation mechanism is provided inside the outer pipe. The irrigation mechanism includes an inner pipe slidably disposed inside the outer pipe. An irrigation hole is provided on the side wall of the inner pipe. When not irrigating, the inner pipe retracts into the outer pipe to close the irrigation hole. When irrigating, it can extend out of the outer pipe under the pressure of the irrigation liquid to expose the irrigation hole for irrigation.

[0005] In one possible design, the control mechanism further includes a fixed ring fixedly sleeved on the stirring shaft, multiple sliding rods slidably passing through the U-shaped bracket, and a collar I connecting the bottom ends of the multiple sliding rods and a collar II connecting the middle outer wall; the mounting ring is slidably connected to the collar I via a vertical rod I, and a spring I sleeved on the outer wall of the stirring shaft is provided between the fixed ring and the mounting ring; when the stirring resistance of the stirring blade increases, it pushes the mounting ring to move upward against the elastic force of the spring I, and drives the collar I and collar II to move upward.

[0006] In one possible design, the magnetic coupling transmission assembly includes a main rotor driven by a motor II, a driven rotor connected to the auger via a transmission shaft, and magnets II and I coupled to each other on the opposing surfaces of the main rotor and the driven rotor; a limiting ring is provided on the transmission shaft, and a spring II is provided between the limiting ring and the driven rotor; a rotating ring is rotatably sleeved on the driven rotor, and the rotating ring is connected to the collar II via a rope; when the collar II moves upward, the rotating ring and the driven rotor are pulled by the rope to move, causing magnet I and magnet II to be misaligned to decouple.

[0007] In one possible design, the centrifugal filtration mechanism includes a conical cylinder, the top of which is connected to the stirring container via an inlet pipe, and its side wall is provided with an injection pipe tangential to the inner wall of the cone. A collection cylinder is detachably connected to its bottom. Water flows tangentially into the conical cylinder from the injection pipe, generating a swirling flow. Sand particles fall along the cylinder wall into the collection cylinder under centrifugal force, and the clarified water overflows from the inlet pipe to the stirring container.

[0008] In one possible design, the irrigation mechanism further includes a closed ring and a slide rod fixed inside the outer tube, and a circular ring slidably sleeved on the slide rod and connected to the inner tube in a sealed rotational connection via a rotating sealing ring, wherein the rotating sealing ring is embedded in the inner wall of the circular ring; a spring III is provided between the circular ring and the inner wall of the outer tube; under the action of irrigation liquid pressure, the inner tube slides outward against the elastic force of the spring III, causing the irrigation hole to move out of the closed ring.

[0009] In one possible design, an installation plate is fixed inside the outer tube, and a support rod extending into the inner tube is fixed on one side of the installation plate. A vertical rod II is fixed on the support rod, and hemispheres are provided at both ends of the vertical rod II. The inner wall of the inner tube is provided with a spiral groove that slides with the hemispheres. When the inner tube extends, it rotates through the cooperation between the hemispheres and the spiral grooves.

[0010] In one possible design, a cone is fixed to the protruding end of the inner tube.

[0011] In one possible design, the outer wall of the inner tube is provided with an annular groove, and the inner wall of the closed ring is fixed with a rubber ring that mates with the annular groove.

[0012] In one possible design, a corrugated protective cover surrounding the spring I is provided between the fixing ring and the mounting ring.

[0013] In one possible design, the end of the conveying container is provided with a sealed protective box, in which the main rotor, driven rotor, and rotating ring are all sealed to prevent external dust and moisture from entering. The rope extends into the protective box, and the main rotor, driven rotor, and rotating ring are located inside the protective box. The bottom of the rotating ring is connected to a movable seat through a vertical plate, and the movable seat is slidably disposed in a sliding groove of a support plate fixed to the conveying container. The side of the rotating ring facing the main rotor contacts the end face of the main rotor through a sliding ring.

[0014] Beneficial effects: In this invention, centrifugal force generated by the spiral flow of water is used to separate impurities such as sand and pebbles in the water. There is no need to manually disassemble and clean the filter screen, realizing automatic filtration of the water source. The tangential design of the conical cylinder and the injection pipe ensures that the water flow can form a stable rotating flow field, improving the impurity separation effect, preventing impurities from entering the mixing container and irrigation pipe, reducing the probability of pipe blockage, and reducing the frequency of equipment maintenance. The threaded connection between the collection cylinder and the conical cylinder facilitates impurity cleaning, is easy to operate, and does not affect the overall operation process. In this invention, the control mechanism automatically adjusts the position of the mounting ring by changing the solution resistance experienced by the stirring blades, thereby controlling the magnetic coupling state between the driven rotor and the main rotor. This achieves automatic control of the auger's start and stop, eliminating the need for additional concentration sensors and control systems. Concentration regulation is achieved through the linkage of the mechanical structure, resulting in a reliable structure that is less prone to failure and adaptable to the complex working environment of farmland. The coordinated setting of springs I and II ensures that each component can be stably reset, maintaining the cyclical operation of the control mechanism. This ensures that the fertilizer application rhythm matches the stirring and dissolving efficiency, preventing the liquid fertilizer concentration from being too high or too low, guaranteeing the crop's absorption of water and fertilizer, and reducing fertilizer waste. In this invention, the irrigation mechanism achieves automatic opening and closing of the irrigation hole and soil insertion through the extension and rotation design of the inner tube. In the initial state, the irrigation hole is sealed by the sealing ring, which effectively prevents plant roots from invading and soil impurities from clogging, thus extending the service life of the irrigation pipe. The rotation of the inner tube during movement, combined with the conical head structure, can reduce soil resistance, allowing the inner tube to be smoothly inserted into the deep soil layer, ensuring that liquid fertilizer is directly delivered to the crop root area, improving irrigation efficiency, reducing water waste, and the rubber ring enhances the sealing of the sealing ring, further improving the anti-clogging effect and ensuring the stability of irrigation operations. In this invention, the control mechanism automatically stops feeding by utilizing changes in stirring resistance, avoiding the problems of high cost and easy damage of electronic monitoring; the centrifugal filtration mechanism adopts cyclone separation technology to improve the dirt-holding capacity and reduce the frequency of disassembly and cleaning; the irrigation mechanism drives the inner tube to extend and rotate through water pressure, effectively preventing root invasion, effectively reducing equipment maintenance costs, extending service life, and maintaining irrigation efficiency, providing a low-cost and highly reliable comprehensive solution for underground drip irrigation technology. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of an automatic fertilizer control head system suitable for arid regions in northern China, provided by the present invention. Figure 2 A three-dimensional cross-sectional structural diagram of an automatic fertilizer control head system suitable for arid regions in northern China, provided by the present invention. Figure 3 A three-dimensional structural diagram of the stirring shaft, mounting ring, and stirring blades of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 4 This is a three-dimensional exploded view of the mounting ring, corrugated protective cover, and fixing ring of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 5 A three-dimensional structural diagram of the auger, drive shaft, and collar II of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention; Figure 6 This is a three-dimensional exploded structural diagram of the main rotor, drive shaft, and support plate of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 7 This is a three-dimensional exploded cross-sectional view of the main rotor, driven rotor, and rotating ring of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 8 A three-dimensional exploded view of the main rotor and driven rotor of an automatic fertilizer control head system suitable for arid regions in northern China, provided by the present invention. Figure 9 A three-dimensional cross-sectional view of the conical cylinder of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention; Figure 10 This is a three-dimensional structural diagram of the irrigation pipe and outer pipe of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 11 A three-dimensional cross-sectional view of the outer and inner tubes of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 12 This is a three-dimensional exploded view of the circular ring, inner tube, and closed ring of an automatic fertilizer control head system suitable for arid northern regions provided by the present invention. Figure 13 This invention provides a three-dimensional structural diagram of the vertical rod II and the hemisphere of an automatic fertilizer control head system suitable for arid northern regions.

[0016] In the diagram: 1. Mixing container; 2. U-shaped bracket; 3. Motor I; 4. Mixing shaft; 5. Mounting ring; 6. Mixing blade; 7. Connecting rod; 8. Fixing ring; 9. Spring I; 10. Corrugated protective cover; 11. Vertical rod I; 12. Collar I; 13. Collar II; 14. Sliding rod; 15. Conical cylinder; 16. Inlet pipe; 17. Collection cylinder; 18. Injection pipe; 19. Conveying container; 20. Screwdriver; 21. Discharge pipe; 22. Drive shaft; 23. Driven rotor; 24. Magnet I; 25. Main rotor; 26. Magnet II; 27. 1. Motor II; 28. Rotating ring; 29. ​​Sliding ring; 30. Limiting ring; 31. Spring II; 32. Support plate; 33. Sliding groove; 34. Moving seat; 35. Vertical plate; 36. Rope; 37. Water pump; 38. Hollow pipe; 39. Irrigation pipe; 40. Outer pipe; 41. Circular ring; 42. Inner pipe; 43. Sliding rod; 44. Spring III; 45. Irrigation hole; 46. Closing ring; 47. Mounting plate; 48. Support rod; 49. Vertical rod II; 50. Hemisphere; 51. Spiral groove; 52. Annular groove; 53. Rubber ring; 54. Cone. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In one embodiment: Refer to Figure 1 and Figure 2 An automatic fertilizer control head system suitable for arid northern regions is disclosed, relating to the field of agricultural irrigation technology. It mainly includes a mixing container 1, which holds water and solid fertilizer and mixes them to form liquid fertilizer. A U-shaped support 2 is fixedly installed on the top of the mixing container 1. A motor I 3 is fixed to the top of the U-shaped support 2 via a frame. A stirring shaft 4 is rotatably connected to the inner wall of the top of the U-shaped support 2 via bearings. The upper end of the stirring shaft 4 extends above the U-shaped support 2, and the lower end extends into the mixing container 1. The output shaft of the motor I 3 is fixedly connected to the top of the stirring shaft 4 via a coupling. After the motor I 3 is started, it can drive the stirring shaft 4 to rotate around its axis.

[0019] Furthermore, referring to Figure 2 A conveying container 19 is fixed to one side of the mixing container 1 by a bracket. The conveying container 19 is used to convey solid fertilizer. A discharge pipe 21 is fixed to and connected to the bottom of the conveying container 19. The discharge pipe 21 extends downward and enters the interior of the mixing container 1. An auger 20 is rotatably connected inside the conveying container 19. The spiral blades of the auger 20 are used to push the solid fertilizer. When the auger 20 rotates, it can continuously convey the solid fertilizer in the conveying container 19 to the mixing container 1 through the discharge pipe 21.

[0020] Furthermore, referring to Figure 2 A control mechanism is provided between the mixing container 1 and the conveying container 19. The control mechanism is used to automatically stop the fertilizer conveying action of the screw conveyor 20 when the concentration of liquid fertilizer in the mixing container 1 is high. This action provides sufficient dissolution time for the fertilizer already in the mixing container 1, avoiding the problem of insufficient dissolution caused by feeding too quickly.

[0021] Furthermore, referring to Figure 2 The control mechanism includes multiple mounting rings 5 ​​that are slidably sleeved on the outer wall of the stirring shaft 4. The mounting rings 5 ​​can slide along the axial direction of the stirring shaft 4. Multiple stirring blades 6 are fixed on the outer wall of each mounting ring 5. The stirring blades 6 are placed at an inclined angle relative to the plane of the mounting ring 5. When the stirring shaft 4 drives the mounting rings 5 ​​and stirring blades 6 to rotate, the inclined stirring blades 6 can generate tangential and axial stirring forces on the solution, promoting fertilizer dissolution.

[0022] Furthermore, referring to Figures 2-4 The control mechanism also includes multiple sliding rods 14, which are vertically arranged and slide through the top of the U-shaped bracket 2. The outer wall of the sliding rods 14 is covered with a dustproof sealing ring. A common collar II 13 is fixedly fitted on the outer wall of the multiple sliding rods 14. Another common collar I 12 is fixed to the bottom end of the multiple sliding rods 14. The bottom end of the stirring shaft 4 moves sequentially through the center holes of collar II 13 and collar I 12, so that collar I 12 and collar II 13 can slide up and down relative to the stirring shaft 4, but will not rotate with the stirring shaft 4. Multiple mounting rings 5 ​​are on the stirring shaft 4. Arranged sequentially from top to bottom, adjacent mounting rings 5 ​​are fixedly connected by multiple connecting rods 7, making all mounting rings 5 ​​and stirring blades 6 a single component that can move up and down as a whole. The top of the uppermost mounting ring 5 is fixed with multiple vertical rods I11, which extend vertically upward. The tops of the multiple vertical rods I11 and the bottom of the collar I12 are slidably engaged through a circular slide rail and an arc-shaped slide groove structure. This engagement method allows the vertical rods I11 to slide circumferentially with the mounting ring 5 relative to the collar I12, while also transmitting vertical force.

[0023] Furthermore, referring to Figure 3 and Figure 4A fixing ring 8 is fixedly sleeved on the outer wall of the stirring shaft 4. The fixing ring 8 is located above the uppermost mounting ring 5. The fixing ring 8 is slidably sleeved on the outer wall of multiple vertical rods I11. A spring I9 is ​​fixedly connected between the bottom of the fixing ring 8 and the top of the uppermost mounting ring 5 through a spring seat. The spring I9 is ​​sleeved on the periphery of the stirring shaft 4. The spring I9 is ​​in a stretched state in its natural state. The direction of the elastic force it provides works together with the direction of the gravity on the mounting ring 5 assembly, so that the mounting ring 5 assembly maintains an initial equilibrium position on the stirring shaft 4. When the solution in the stirring container 1 is relatively dilute, the fluid resistance encountered by the stirring blade 6 is small. At this time, the mounting ring 5 assembly remains in its initial position, and the vertical rods I11, collar I12 and collar II13 connected to it also remain at the corresponding initial height.

[0024] Furthermore, referring to Figure 2 , Figure 5 and Figure 6 The control mechanism also includes a drive shaft 22, which is rotatably connected to one end of the conveying container 19 near the U-shaped support 2. One end of the drive shaft 22 extends rotatably into the interior of the conveying container 19 and is fixedly connected to one end of the auger 20. When the drive shaft 22 rotates, it can directly drive the auger 20 to rotate synchronously and complete the feeding action. A driven rotor 23 is slidably sleeved on the outer wall of the drive shaft 22 through a sliding groove and slider structure. The driven rotor 23 can slide along the axial direction of the drive shaft 22, but maintains synchronous rotation with the drive shaft 22 through key connection or other means. Multiple magnets I 24 are fixedly embedded on the outer wall of the driven rotor 23. A main rotor 25 is also rotatably sleeved on the outer wall of the drive shaft 22. One side of the main rotor 25 is rotatably connected to the end plate of the conveying container 19 through a bearing. The end of the driven rotor 23 near the main rotor 25 can extend into the internal cavity of the main rotor 25.

[0025] Furthermore, referring to Figure 2 and Figures 5-8 Multiple magnets II26 are fixedly embedded in the inner wall of the main rotor 25. The position of magnets II26 corresponds to magnets I24 on the driven rotor 23. When one end of the driven rotor 23 extends into the main rotor 25 and magnets I24 and II26 are aligned, they are magnetically coupled through the magnetic field. At this time, if the main rotor 25 rotates, the rotating magnetic field generated by magnets II26 will drive magnets I24 on the driven rotor 23, thereby causing the driven rotor 23 and the transmission shaft 22 to rotate synchronously. This is a non-contact torque transmission method. A motor II27 is fixed on the top of the conveying container 19. The output shaft of motor II27 is connected to the main rotor 25 through a synchronous pulley and a synchronous belt. After motor II27 is started, it can drive the main rotor 25 to rotate continuously.

[0026] Furthermore, referring to Figure 2 , Figure 5 , Figure 6 and Figure 7 A limiting ring 30 is fixedly sleeved on the outer wall of the drive shaft 22. The limiting ring 30 is located on the side of the driven rotor 23 away from the conveying container 19. A spring II 31 is fixedly connected between the limiting ring 30 and the driven rotor 23 through a spring seat. The spring II 31 is in a stretched state in its natural state. Its elastic force continuously pushes the driven rotor 23 to move towards the main rotor 25. This design is intended to keep the driven rotor 23 inclined to extend into the main rotor 25, ensuring that the magnet I 24 and the magnet II 26 are aligned under normal conditions and maintain the magnetic coupling state. A rotating ring 28 is rotatably sleeved on the outer wall of the driven rotor 23 through a bearing. The rotating ring 28 can rotate freely relative to the driven rotor 23. A rope 36 is fixedly connected to the side of the rotating ring 28 away from the conveying container 19. The other end of the rope 36 extends upward and is fixedly connected to the collar II 13 in the control mechanism.

[0027] Furthermore, referring to Figure 2 , Figure 5 and Figure 6 A support plate 32 is fixed at one end of the conveying container 19 near the U-shaped bracket 2. A sliding groove 33 is provided inside the support plate 32. A movable seat 34 is slidably connected inside the sliding groove 33. A dust cover is installed at the opening of the sliding groove 33. A vertical plate 35 slides through the movable seat 34. The vertical plate 35 is fixed to the bottom of the rotating ring 28. This structure makes the rotating ring 28, the movable seat 34, and the vertical plate 35 form a whole. They can slide horizontally along the direction defined by the sliding groove 33, but will not rotate. This prevents the rotating ring 28 from rotating with the driven rotor 23 and ensures the stability of the pulling direction of the rope 36.

[0028] Furthermore, referring to Figure 7 A sliding ring 29 is rotatably connected to the side of the rotating ring 28 near the main rotor 25 via a bearing. The sliding ring 29 can abut against the end face of the main rotor 25. When the spring II 31 pushes the driven rotor 23 and the rotating ring 28 to the limit position in the direction of the main rotor 25, the sliding ring 29 will abut against the end face of the main rotor 25. This abutting action limits the axial movement of the driven rotor 23, preventing the magnet I 24 and the magnet II 26 from becoming misaligned due to excessive proximity. At the same time, the sliding ring 29 can reduce the sliding friction between the rotating ring 28 and the end face of the main rotor 25.

[0029] Furthermore, referring to Figure 8 Each of the multiple magnets I24 and magnet II26 consists of multiple positive and negative magnets, which are arranged alternately in the circumferential direction. This arrangement can enhance the stability of the magnetic coupling between the main rotor 25 and the driven rotor 23 and the ability to transmit torque.

[0030] Furthermore, referring to Figure 1A centrifugal filtration mechanism is provided on one side of the mixing container 1. This mechanism is used to separate and filter out heavy impurities such as sand and stones in the water during the process of injecting field water into the mixing container 1.

[0031] Furthermore, referring to Figure 1 and Figure 9 The centrifugal filtration mechanism includes a conical cylinder 15 fixed to one side of the stirring container 1 by a frame. The inner diameter of the top of the conical cylinder 15 is larger than its inner diameter at the bottom, forming a conical cavity that is larger at the top and smaller at the bottom. A liquid inlet pipe 16 is fixed and connected to the top of the conical cylinder 15. One end of the liquid inlet pipe 16 extends upward and is fixedly inserted into the interior of the stirring container 1. A liquid injection pipe 18 is fixed and connected to the outer wall of the conical cylinder 15. The axial direction of the liquid injection pipe 18 is consistent with the tangential direction of the conical cylinder 15 at that position. This tangential fit causes the water flowing into the conical cylinder 15 through the liquid injection pipe 18 to generate a spiral downward swirling motion along the inner wall of the conical cylinder 15. A collection cylinder 17 is connected to the bottom of the conical cylinder 15 by a thread. The collection cylinder 17 is used to collect the sand and stones separated in the swirling motion.

[0032] Furthermore, referring to Figure 1 and Figure 10 A water pump 37 is provided on one side of the mixing container 1. The inlet end of the water pump 37 is fixedly connected to the bottom of the mixing container 1 through a pipe. The outlet end of the water pump 37 is fixedly connected to a hollow pipe 38 through a hose. The hollow pipe 38 is buried under the soil in the planting area. Multiple irrigation pipes 39 are fixedly connected to one side of the hollow pipe 38. The irrigation pipes 39 extend along the field layout direction. Multiple outer pipes 40 are fixedly connected to both sides of each irrigation pipe 39. The outer pipes 40 extend to one side. Each outer pipe 40 is equipped with an irrigation mechanism. This irrigation mechanism is used to prevent the outlet of the outer pipe 40 from being blocked by plant roots when carrying out underground irrigation.

[0033] Furthermore, referring to Figure 10 and Figure 11The irrigation mechanism includes a ring 41 that slides and seals within an outer pipe 40. The outer wall of the ring 41 maintains a sealed sliding fit with the inner wall of the outer pipe 40. Multiple sliding rods 43 are fixed to the inner wall of the outer pipe 40 on the side furthest from the irrigation pipe 39. One end of each sliding rod 43 slides through the ring 41 in a sealed manner. An inner pipe 42 rotates through the ring 41 via a rotating sealing ring. The rotating sealing ring is embedded in the inner wall of the ring 41, ensuring the rotational freedom of the inner pipe 42 relative to the ring 41 while preventing liquid fertilizer from leaking through the gap. The outer wall of the inner pipe 42 and the inner hole of the ring 41 are sealed together. The inner tube 42 achieves sealing and rotational engagement. The end of the inner tube 42 away from the irrigation pipe 39 passes through the inner wall of the corresponding position of the outer tube 40 and can extend and retract within the outer tube 40. Multiple irrigation holes 45 are provided on the wall of the inner tube 42. These irrigation holes 45 are used to discharge the liquid fertilizer in the outer tube 40 to the surrounding soil. A sealing ring 46 is also fitted on the outer wall of the inner tube 42. The sealing ring 46 is fixed to the inner wall of the outer tube 40 on the side away from the irrigation pipe 39. When the inner tube 42 retracts into the outer tube 40, the sealing ring 46 completely seals the irrigation holes 45 on the inner tube 42 to prevent soil and roots from entering.

[0034] Furthermore, referring to Figures 10-12 Between the inner wall of the outer tube 40 and the side away from the irrigation pipe 39, a spring III 44 is sleeved on multiple sliding rods 43. The spring III 44 is in a stretched state in its natural state. Its elastic force pushes the ring 41 and the inner tube 42 connected to it to move towards the irrigation pipe 39, so that the inner tube 42 keeps contracting inside the outer tube 40. At this time, the irrigation hole 45 is located inside the closing ring 46 and is in a closed state. Spring I 9, spring II 31 and spring III 44 are all galvanized for corrosion protection.

[0035] Furthermore, referring to Figure 2 and Figure 4 A corrugated protective cover 10 is fixed between the bottom of the fixed ring 8 and the top of the uppermost mounting ring 5. The vertical rod I 11, spring I 9 and stirring shaft 4 all pass through the inside of the corrugated protective cover 10. The corrugated protective cover 10 is used to prevent the solution or fertilizer particles in the stirring container 1 from entering the spring I 9 area and to protect the spring I 9. A protective box is fixed at one end of the conveying container 19 near the U-shaped bracket 2, and the rope 36 extends into the protective box. The drive shaft 22, driven rotor 23, main rotor 25, rotating ring 28 and support plate 32 are all located inside the protective box. The protective box is used to protect these transmission components from external dust and moisture. The detachable design of the sealed protective box and the collection cylinder 17 makes it convenient for users to clean and maintain the internal transmission components regularly, ensuring the long-term reliability of the system.

[0036] In another embodiment: Refer to Figure 10 and Figures 11-13An installation plate 47 is fixed inside the outer pipe 40. The installation plate 47 is located between the ring 41 and the irrigation pipe 39. A support rod 48 is fixed on one side of the installation plate 47. The support rod 48 extends away from the irrigation pipe 39 and into the interior of the inner pipe 42. A vertical rod II 49 is fixed through the support rod 48. A hemisphere 50 is fixed at both the top and bottom of the vertical rod II 49. Two spiral grooves 51 are opened on the inner wall of the inner pipe 42. The two hemispheres 50 slide with the two spiral grooves 51 respectively. When the inner pipe 42 moves axially relative to the support rod 48 and the vertical rod II 49, the hemispheres 50 slide along the spiral grooves 51, which will force the inner pipe 42 to rotate around its own axis. A cone 54 is fixed at the end of the inner pipe 42 away from the installation plate 47. The tip of the cone 54 helps the inner pipe 42 to penetrate the soil more easily when it extends.

[0037] Furthermore, referring to Figure 12 and Figure 13 The outer wall of the inner tube 42 is provided with an annular groove 52, and a rubber ring 53 is fitted on the outer wall of the annular groove 52. The rubber ring 53 is fixed to the inner wall of the closing ring 46 and is located at one end of the closing ring 46 near the circular ring 41. When the inner tube 42 contracts and the irrigation hole 45 moves to the position of the closing ring 46, the rubber ring 53 can enhance the sealing effect of the closing ring 46 around the irrigation hole 45.

[0038] Furthermore, the system also includes a controller (not shown in the figure), which is preferably a PLC or a microcontroller, and is electrically connected to motor I3, motor II27, water pump 37, and a liquid level sensor (optional) located in the stirring container 1. To further enhance the system's intelligent water-saving capabilities and water resource protection functions, the following design was implemented in the control logic and sensor network: First, the system incorporates a spatiotemporal irrigation strategy. The controller is equipped with a BeiDou positioning module. After power-on, the controller automatically identifies the device's geographical location using the BeiDou positioning module and automatically pushes and loads specific crop irrigation strategy algorithms (such as local soil type and climate characteristics) from the cloud database based on latitude and longitude information, thereby achieving precise water-saving irrigation tailored to local conditions.

[0039] Secondly, the system enables automatic calculation of water demand based on meteorological data. The controller incorporates the ETO (Evapotranspiration) algorithm. By connecting to field humidity sensors and meteorological data, the controller can calculate the current ETO value in real time. Combined with field soil moisture data, it scientifically analyzes the real-time water demand of crops, thereby automatically and dynamically adjusting irrigation duration and amount to achieve "on-demand water supply" and avoid waste caused by over-irrigation.

[0040] Third, the system features constant pressure water-saving control. The controller integrates a PID algorithm for automatic pressure adjustment. Through pressure sensors on the pipeline, it provides real-time feedback of network pressure data. The PID algorithm performs closed-loop control on water pump 37, adjusting its operating frequency in real time to maintain a constant irrigation pressure. This not only ensures uniform water output from all irrigation holes 45 but also avoids the risk of pipe bursts due to excessive pressure fluctuations or hidden water waste caused by excessive pressure.

[0041] Fourth, regarding water and fertilizer control, the water-saving first-stage fertilizer suction pump (not shown in the figure) is controlled by a frequency converter. The controller collects real-time data from the fertilizer solution EC (electrical conductivity) sensor and soil nutrient sensor data in the field, and automatically adjusts the pump speed via the frequency converter after calculation. When soil nutrients are sufficient or the fertilizer solution concentration is too high, the pump speed is reduced to decrease the amount of fertilizer; conversely, the pump speed is increased, thereby achieving precise linear regulation of water and fertilizer concentration and preventing fertilizer waste.

[0042] Fifth, the system strengthens the linkage protection mechanism for groundwater resources. The water-saving head unit is connected to a well water level sensor installed in the water source well for real-time detection of groundwater level. The controller performs linear logic control based on the monitored groundwater level data: when the groundwater level is detected to be dropping but not below the warning line, the controller linearly adjusts the pumping frequency and flow rate of the water pump 37 to reduce extraction; when the groundwater level is detected to be below the set limit threshold, the controller automatically and forcibly stops irrigation water use to protect the groundwater source from drying up, and at the same time sends an early warning report to the water management department through the communication module, realizing the overall management and protection of regional water resources.

[0043] By combining the aforementioned hardware and algorithms, this system not only solves the physical problem of preventing blockages, but also achieves intelligent water-saving and water-control throughout the entire process from water source protection and precise fertilizer application to on-demand irrigation at the software level.

[0044] A method for using an automatic fertilizer control head unit suitable for arid northern regions includes the following steps: S1. During operation, motor I3 drives the stirring shaft 4 to rotate at a constant speed, which drives the mounting ring 5 and stirring blade 6 to stir the solution in the stirring container 1. At the same time, motor II27 drives the main rotor 25 to rotate. Under the push of spring II31, the driven rotor 23 remains inserted into the main rotor 25. Magnet I24 and magnet II26 are aligned to form magnetic coupling. The rotational torque of the main rotor 25 is transmitted to the driven rotor 23 through magnetic force, driving the transmission shaft 22 and the auger 20 to rotate, thereby continuously feeding solid fertilizer from the conveying container 19 into the stirring container 1 through the discharge pipe 21. S2. In the initial stage, the water volume in the mixing container 1 is sufficient, the added fertilizer dissolves quickly, the solution concentration is low, the fluidity is good, and the fluid resistance experienced by the stirring blade 6 when rotating is small. At this time, the mounting ring 5 assembly (including mounting ring 5, stirring blade 6, vertical rod I11, collar I12, collar II13 and sliding rod 14) is subjected to downward gravity, the elastic force of spring I9 and the fluid resistance experienced by the stirring blade 6 are balanced. The mounting ring 5 assembly, vertical rod I11, collar I12 and collar II13 are all kept at the initial height position, the rope 36 is in a slack state and does not affect the position of the driven rotor 23. S3. If the feeding speed continues to be too fast, exceeding the fertilizer's instantaneous dissolution capacity, the local or overall solution concentration in the mixing container 1 will increase. The viscosity of the high-concentration solution will increase, and its fluidity will decrease. Under the condition that the rotation speed of the mixing shaft 4 is constant, the inclined mixing blade 6 will encounter greater fluid resistance when rotating. Since the mixing blade 6 is installed at an incline, the fluid resistance will generate a component force along the axial direction of the mixing shaft 4. When this axial component force exceeds the sum of the weight of the mounting ring 5 assembly, the elastic force of spring I9, and related frictional forces, it will push... The mounting ring 5 assembly slides upward along the stirring shaft 4. When the mounting ring 5 assembly moves upward, it pushes the collar I12 upward through the vertical rod I11. The collar I12 drives the sliding rod 14 and the collar II13 to move upward synchronously. The upward movement of the collar II13 tightens the rope 36 connected to it. The rope 36 pulls the rotating ring 28. The rotating ring 28 is guided in the sliding groove 33 of the support plate 32 through the vertical plate 35 and the moving seat 34, which drives the driven rotor 23 to overcome the elastic force of the spring II31 and slide away from the main rotor 25 along the transmission shaft 22. S4. The driven rotor 23 slides outward, causing its end to gradually exit the main rotor 25. The relative positions of magnet I 24 and magnet II 26 are misaligned, and the magnetic coupling between them weakens rapidly until it disappears. At this time, although the main rotor 25 is still rotating under the drive of motor II 27, its torque can no longer be transmitted to the driven rotor 23 and the drive shaft 22. The auger 20 stops rotating, and the feeding process is interrupted. After the feeding is interrupted, the stirring blade 6 continues to stir the high-concentration solution already in the stirring container 1. As the fertilizer gradually dissolves, the solution concentration decreases, the fluidity is restored, and the fluid resistance on the stirring blade 6 decreases accordingly. When the axial resistance component is less than the mounting ring 5 group When the sum of the gravity and the elastic force of spring I9 is ​​reached, the mounting ring 5 assembly begins to move downwards under the action of gravity and spring I9. Loop I12 and Loop II13 then descend, rope 36 loosens, and the elastic force of spring II31 pushes the driven rotor 23 back towards the main rotor 25 until the sliding ring 29 contacts the end face of the main rotor 25. Magnet I24 and Magnet II26 align again, restoring magnetic coupling, and the auger 20 resumes operation, transporting fertilizer. This process forms a feedback regulation based on changes in solution concentration. When the solution concentration is too high, feeding is automatically paused to provide a buffer time for the dissolution process; feeding is automatically resumed when the concentration decreases, achieving dynamic matching between feeding speed and dissolution speed. S5. When water needs to be added to the mixing container 1, start the field submersible pump connected to the injection pipe 18. Under pressure, the water flows tangentially into the upper part of the conical cylinder 15 through the injection pipe 18. Since the injection direction is tangential to the inner wall of the conical cylinder 15, the water immediately spirals downward along the conical inner wall of the conical cylinder 15 after entering. The water rotates at high speed inside the conical cylinder 15, generating a centrifugal force field. Solid impurities with a higher specific gravity in the water, such as sand and pebbles, are thrown towards the cone under the action of centrifugal force. The particles lose some tangential velocity after colliding with the inner wall of the conical cylinder 15 and slide down the inner wall in a spiral motion mainly due to gravity, eventually falling into the collection cylinder 17 with a threaded connection at the bottom. The relatively clean water flow forms a low-pressure area in the center of the vortex and is pushed by the subsequent water inlet to form an upward internal vortex. This upward water flow overflows from the liquid inlet pipe 16 at the top of the conical cylinder 15 and enters the stirring container 1. By periodically unscrewing the collection cylinder 17, the accumulated mud and sand impurities can be cleaned. S6. When the controller calculates the water demand according to the ETO algorithm and issues an irrigation command or when the preset irrigation time is reached, the controller starts the water pump 37 based on the PID constant pressure control strategy. The water pump 37 extracts the liquid fertilizer prepared in the mixing container 1 and pumps it into each outer pipe 40 through the pipe, hollow pipe 38 and irrigation pipe 39. After the liquid fertilizer enters the outer pipe 40, it first acts on the closed end face of the ring 41 and the inner pipe 42. As the pressure increases, the axial force generated by the liquid pressure acting on the ring 41 and the inner pipe 42 gradually overcomes the elastic force of the spring III 44 and the resistance of the soil to the cone head 54. This thrust pushes the ring 41 to slide away from the irrigation pipe 39 along the slide bar 43, and at the same time drives the inner pipe 42 to extend outward from the outer pipe 40. When the inner pipe 42 extends, the irrigation hole 45 on it gradually moves out of the sealing range of the closed ring 46 and the rubber ring 53 and is exposed to the soil environment. S7. As the inner tube 42 extends axially, the vertical rod II 49 on the support rod 48 remains fixed, and its end hemisphere 50 is engaged in the spiral groove 51 on the inner wall of the inner tube 42. The axial movement of the inner tube 42 forces the hemisphere 50 to slide along the spiral groove 51, thereby converting the axial movement into the rotational movement of the inner tube 42 around its own axis. The inner tube 42 extends outward while rotating, and its front cone 54 helps to break the soil and reduce the extension resistance. When the inner tube 42 extends to the set position, the irrigation hole 45... Once fully exposed, liquid fertilizer seeps out from irrigation hole 45, providing localized irrigation to the surrounding soil. When irrigation ends, pump 37 stops working, the pressure inside outer pipe 40 decreases, and the elastic force of spring III 44 pushes ring 41 and inner pipe 42 to retract. Inner pipe 42 also rotates during the retraction process until it is completely retracted into outer pipe 40. At this point, irrigation hole 45 is once again tightly sealed by sealing ring 46 and rubber ring 53, effectively preventing soil particles and plant roots from entering the interior of inner pipe 42 and preventing blockage.

[0045] Water from the field is injected into the conical cylinder 15 through the injection pipe 18 by a submersible pump. The injection pipe 18 is tangent to the conical inner wall of the conical cylinder 15. Therefore, the water flows spirally along the inner wall of the conical cylinder 15 and rotates. The heavier sand and stones are thrown to the outer wall under the action of centrifugal force and slide down the wall into the collection cylinder 17. The relatively clean water forms an upward vortex at the center of the vortex and overflows from the inlet pipe 16 into the mixing container 1 to participate in the mixing of solid fertilizer. S2. When conveying solid fertilizer into the mixing container 1, motor II 27 drives the main rotor 25 to rotate through the synchronous pulley and synchronous belt. The main rotor 25 forms magnetic coupling through the internal magnet II 26 and the magnet I 24 on the outer wall of the driven rotor 23. In turn, the main rotor 25 drives the driven rotor 23 and the transmission shaft 22 to rotate. The transmission shaft 22 drives the auger 20 to rotate and conveys the solid fertilizer in the auger 20 to the mixing container 1 through the discharge pipe 21. S3. When the solution in the mixing container 1 is relatively dilute, the stirring resistance of the stirring blade 6 is small. The main rotor 25 and the driven rotor 23 maintain magnetic coupling and continuously inject fertilizer into the mixing container 1. If the feeding is too fast, the solution concentration will be high. Since the high concentration solution has poor fluidity, the resistance of the stirring blade 6 will increase when stirring, even when the stirring shaft 4 rotates at a constant speed. Because the stirring blade 6 is placed at an angle, it is pushed upward by the resistance of the solution, and the stirring blade 6 and the mounting ring 5 are pushed upward to overcome the weight of the mounting ring 5, the stirring blade 6, the collar I 12, and the collar II 13. The force and the elastic force of spring I9 cause the mounting ring 5 to push the collar I12 and collar II13 upward as a whole through the vertical rod I11. The collar II13 pulls the rotating ring 28 towards the stirring shaft 4 through the rope 36. The rotating ring 28 drives the driven rotor 23 to move synchronously, causing the magnet I24 in the driven rotor 23 to be misaligned with the magnet II26 in the main rotor 25, thereby releasing the magnetic coupling between the main rotor 25 and the driven rotor 23. The auger 20 stops feeding, giving the mounting ring 5 sufficient time to stir and dissolve the existing fertilizer. S4. When the irrigation command is issued or the preset irrigation time is reached, the controller starts the water pump 37. The water pump 37 injects the liquid fertilizer in the mixing container 1 into the outer pipe 40 through the hollow pipe 38 and the irrigation pipe 39, and irrigates through the irrigation hole 45. In the initial state, the inner pipe 42 is contracted into the outer pipe 40 under the elastic force of the spring III 44, and multiple irrigation holes 45 are simultaneously located in the outer pipe 40. The roots of the plants cannot enter the outer pipe 40 and the irrigation holes 45 to avoid physical blockage. When irrigation is needed, the liquid fertilizer enters the inner pipe 42. Under the action of the liquid fertilizer, the inner pipe 42 overcomes the elastic force of the spring III 44 and moves to the outside of the outer pipe 40, exposing the irrigation hole 45 from the outer pipe 40, so that the liquid fertilizer can be used for irrigation. S5. In addition, when the inner tube 42 is pushed outward by water pressure, the sliding fit between the spiral groove 51 and the hemisphere 50 allows the inner tube 42 to extend outward while rotating, and under the action of the cone head 54, it can reduce the obstruction of the soil on the inner tube 42, so that the inner tube 42 can extend out and be inserted into the soil for irrigation.

[0046] This system requires regular maintenance during field operations. 1. Disassemble collection cylinder 17 every 7-10 days to clean up the deposited silt; 2. Apply rust-preventive lubricant to the mating surfaces of sliding rod 14, sliding groove 33, etc., every month; 3. Check the magnetic attraction strength of the magnets in the magnetic coupling assembly every quarter and replace any demagnetized parts promptly; 4. Regularly check the spring tension and replace any worn-out components.

[0047] However, as is well known to those skilled in the art, the working principles and wiring methods of motor II27 and motor I3 are conventional methods or common knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0048] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic fertilizer control head system suitable for arid areas in northern China, comprising a stirring container (1) with a U-shaped bracket (2) installed on its top, a motor I (3) installed on the U-shaped bracket (2), and a stirring shaft (4) extending into the stirring container (1) fixedly connected to the output shaft of the motor I (3). A conveying container (19) is fixed to one side of the mixing container (1) by a bracket. The bottom of the conveying container (19) is provided with a discharge pipe (21) extending into the mixing container (1). The conveying container (19) is provided with an auger (20) for conveying solid fertilizer. The container is characterized in that... Also includes: A control mechanism is provided between the stirring container (1) and the conveying container (19). The control mechanism includes a mounting ring (5) slidably sleeved on the stirring shaft (4) and an inclined stirring blade (6) fixed to the outer wall of the mounting ring (5), as well as a magnetic coupling transmission assembly for driving the auger (20). The magnetic coupling transmission assembly can be triggered to disengage when the stirring blade (6) drives the mounting ring (5) to move axially due to the increase of stirring resistance, thereby stopping the auger (20) from feeding. A centrifugal filtration mechanism, connected to the stirring container (1), is used to separate sand particles in the water when water is added to the stirring container (1); A water pump (37) is connected to the stirring container (1) at its inlet end.

2. The automatic fertilizer control head system suitable for arid northern regions according to claim 1, characterized in that, The control mechanism also includes a fixed ring (8) fixedly sleeved on the stirring shaft (4), multiple sliding rods (14) slidably passing through the U-shaped bracket (2), and a collar I (12) connecting the bottom end of the multiple sliding rods (14) and a collar II (13) on the middle outer wall; the mounting ring (5) is slidably connected to the collar I (12) through the vertical rod I (11), and a spring I (9) sleeved on the outer wall of the stirring shaft (4) is provided between the fixed ring (8) and the mounting ring (5); when the stirring resistance of the stirring blade (6) increases, it pushes the mounting ring (5) to overcome the elastic force of the spring I (9) and moves it upward, and drives the collar I (12) and the collar II (13) to move upward.

3. The automatic fertilizer control head system suitable for arid northern regions according to claim 2, characterized in that, The magnetic coupling transmission assembly includes a main rotor (25) driven by a motor II (27), a driven rotor (23) connected to the auger (20) via a transmission shaft (22), and magnets II (26) and I (24) coupled to each other on the opposite surfaces of the main rotor (25) and the driven rotor (23); a limiting ring (30) is provided on the transmission shaft (22), and a spring II (31) is provided between the limiting ring (30) and the driven rotor (23); a rotating ring (28) is rotatably sleeved on the driven rotor (23), and the rotating ring (28) is connected to the collar II (13) via a rope (36); when the collar II (13) moves upward, the rotating ring (28) and the driven rotor (23) are pulled by the rope (36) to move, so that the magnet I (24) and the magnet II (26) are misaligned to decouple.

4. The automatic fertilizer control head system suitable for arid northern regions according to claim 3, characterized in that, The centrifugal filtration mechanism includes a conical cylinder (15), the top of which is connected to the stirring container (1) via an inlet pipe (16), and its side wall is provided with an injection pipe (18) tangential to the inner wall of the cone. Its bottom is detachably connected to a collection cylinder (17). Water flows tangentially into the conical cylinder (15) from the injection pipe (18) to generate a swirling flow. Sand particles fall into the collection cylinder (17) along the cylinder wall under the action of centrifugal force. The clarified water flows out from the inlet pipe (16) to the stirring container (1).

5. The automatic fertilizer control head system suitable for arid northern regions according to claim 4, characterized in that, It also includes an irrigation unit, comprising a buried hollow pipe (38) connected to the outlet end of the water pump (37), an irrigation pipe (39) connected to the hollow pipe (38), and a plurality of outer pipes (40) connected to the irrigation pipe (39); the outer pipe (40) is provided with an irrigation mechanism, the irrigation mechanism including an inner pipe (42) slidably disposed in the outer pipe (40), the inner pipe (42) having an irrigation hole (45) on its side wall, the inner pipe (42) retracting into the outer pipe (40) when not irrigating so that the irrigation hole (45) is closed, and extending out of the outer pipe (40) under the action of irrigation liquid pressure during irrigation to expose the irrigation hole (45) for irrigation; It also includes a closed ring (46) and a slide rod (43) fixed inside the outer tube (40), and a circular ring (41) slidably sleeved on the slide rod (43) and connected to the inner tube (42) by a rotating sealing ring to achieve a sealed rotational connection. The rotating sealing ring is embedded in the inner wall of the circular ring (41). A spring III (44) is provided between the circular ring (41) and the inner wall of the outer tube (40). Under the action of irrigation liquid pressure, the inner tube (42) overcomes the elastic force of the spring III (44) and slides outward, so that the irrigation hole (45) moves out of the closed ring (46).

6. The automatic fertilizer control head system suitable for arid northern regions according to claim 5, characterized in that, An installation plate (47) is fixed inside the outer tube (40). A support rod (48) extending into the inner tube (42) is fixed on one side of the installation plate (47). A vertical rod II (49) is fixed on the support rod (48). Hemispheres (50) are provided at both ends of the vertical rod II (49). A spiral groove (51) is provided on the inner wall of the inner tube (42) to slide with the hemispheres (50). When the inner tube (42) extends, it rotates through the cooperation between the hemispheres (50) and the spiral grooves (51).

7. The automatic fertilizer control head system suitable for arid northern regions according to claim 6, characterized in that, The inner tube (42) has a cone (54) fixed at its extended end.

8. The automatic fertilizer control head system suitable for arid northern regions according to claim 7, characterized in that, The outer wall of the inner tube (42) is provided with an annular groove (52), and the inner wall of the closed ring (46) is fixed with a rubber ring (53) that cooperates with the annular groove (52).

9. The automatic fertilizer control head system suitable for arid northern regions according to claim 8, characterized in that, A corrugated protective cover (10) surrounding the spring I (9) is provided between the fixing ring (8) and the mounting ring (5).

10. An automatic fertilizer control head system suitable for arid northern regions according to claim 9, characterized in that, The end of the conveying container (19) is provided with a sealed protective box. The main rotor (25), the driven rotor (23) and the rotating ring (28) are all sealed in the protective box to prevent external dust and moisture from entering. The rope (36) extends into the protective box. The main rotor (25), the driven rotor (23) and the rotating ring (28) are located in the protective box. The bottom of the rotating ring (28) is connected to a movable seat (34) through a vertical plate (35). The movable seat (34) is slidably disposed in the sliding groove (33) of the support plate (32) fixed to the conveying container (19). The side of the rotating ring (28) facing the main rotor (25) contacts the end face of the main rotor (25) through a sliding ring (29).

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