Agricultural water-saving irrigation equipment

Abstract

The application relates to the field of agricultural irrigation technology, and discloses a kind of agricultural water-saving irrigation equipment, including water supply network pipe and irrigation head on water supply network pipe, irrigation head includes: outer main pipe, inner main pipe is arranged in outer main pipe along its axial direction, and the outer periphery of the lower end of inner main pipe is provided with water wheel;Multiple jet pipes are uniformly arranged around the upper end of inner main pipe, the lower end of jet pipe is rotatably connected with the outer wall of inner main pipe, and jet pipe and inner main pipe are communicated through hose;Spray range regulator, jet port adjusting sleeve is included in spray range regulator, multiple jet ports are formed in the side wall of the side of the upper end of jet pipe away from inner main pipe, and jet port adjusting sleeve is used to adjust the number of jet ports for water outlet on jet pipe.The agricultural water-saving irrigation equipment can adjust the number of jet ports when jet pipe is in the state of revolution and corresponds to the corner of square irrigation area, and realizes the full coverage of irrigation area.

Description

Technical Field

[0001] This invention relates to the field of agricultural irrigation technology, and in particular to a water-saving irrigation device for agriculture. Background Technology

[0002] Agricultural irrigation plays a vital role in crop production, ensuring crops receive sufficient and timely water, which is fundamental to improving crop growth rate and yield. With the continuous development of agricultural irrigation technology, traditional water pipe installation methods are gradually being replaced by pre-buried irrigation networks and sprinklers installed on these networks. However, most irrigation equipment currently has relatively simple sprinkler structures and single functions. Once installed, the spray angle is fixed, resulting in a small spray range. Although some irrigation equipment can increase the spray range by rotating the sprinkler head through a specific structure, in general, agricultural planting areas are often divided into multiple square grids, with each sprinkler responsible for irrigating one grid. If the sprinkler head simply rotates in a circle, it is difficult to irrigate crops at the corners of the grid. Increasing the circumferential coverage area results in crops at the intersection of the straight edges of adjacent grids receiving far more irrigation than those at the corners, making it difficult to achieve uniform irrigation. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an agricultural water-saving irrigation device that solves the problem of poor uniformity in irrigation of square grids in existing technologies.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An agricultural water-saving irrigation device includes a water supply network pipe and an irrigation head disposed on the water supply network pipe, wherein the irrigation head includes:

[0006] An outer main pipe is provided, and an inner main pipe is provided along its axial direction inside the outer main pipe. The lower end of the inner main pipe is connected to the interior of the outer main pipe, and a water wheel is provided on the outer periphery of the lower end of the inner main pipe for driving the inner main pipe to rotate.

[0007] A plurality of jet tubes are evenly arranged around the upper end of the inner main tube and are connected to the inner main tube.

[0008] A jet range adjuster includes a jet outlet adjusting sleeve. Multiple jet outlets are provided on the side wall of the upper end of the jet pipe away from the inner main pipe. The jet outlet adjusting sleeve is slidably fitted onto the upper end of the jet pipe to adjust the number of jet outlets available for water discharge along its axial direction. The inner wall of the outer main pipe is provided with a sleeve moving structure. The outer main pipe has four range adjustment zones arranged in a circular array with its axis as the center. When the jet pipe moves into the range adjustment zone, the sleeve moving structure controls the jet outlet adjusting sleeve to increase the number of jet outlets available for water discharge. When the jet pipe leaves the range adjustment zone, the sleeve moving structure controls the adjusting sleeve to decrease the number of jet outlets available for water discharge.

[0009] Preferably, the sleeve moving structure includes:

[0010] A pressure plate is located at the lower end of the jet outlet regulating sleeve;

[0011] The inner wall of the outer main pipe is provided with a push plate corresponding to the range adjustment area. The push plate is located below the pressure plate. The push plate is arranged from low to high along the rotation direction of the inner main pipe. When the jet pipe enters the range adjustment area, the lower side of the push plate contacts the pressure plate first. As the push plate rises, it pushes the pressure plate upward.

[0012] An upper push plate is provided between two adjacent lower push plates. The upper push plate is located on the inner wall of the outer main pipe at a position corresponding to the non-range adjustment area, and the upper push plate is located above the pressure plate. The upper push plate is set from high to low along the rotation direction of the inner main pipe. When the jet tube leaves the range adjustment area, the higher side of the upper push plate contacts the pressure plate first, and as the upper push plate lowers, it pushes the pressure plate downward.

[0013] Preferably, the jet outlet includes a main jet outlet and secondary jet outlets. Multiple secondary jet outlets are respectively provided on the upper and lower sides of the main jet outlet. The diameter of the main jet outlet is larger than the diameter of the secondary jet outlets. A main orifice corresponding to the main jet outlet is provided in the middle of the jet outlet adjusting sleeve. Secondary orifices corresponding to the secondary jet outlets are respectively provided at the upper and lower ends of the jet outlet adjusting sleeve. When the jet outlet adjusting sleeve slides to its highest position, the main jet outlet is exposed from the main orifice, and the secondary jet outlets are exposed from the secondary orifices. When the jet outlet adjusting sleeve slides to its lowest position, the main jet outlet is exposed from the main orifice, and the secondary jet outlets are closed by the jet outlet adjusting sleeve.

[0014] Preferably, the lower end of the jet pipe is rotatably connected to the outer wall of the inner main pipe, and the jet pipe and the inner main pipe are connected by a flexible hose. The irrigation head further includes:

[0015] The jet angle adjuster is annular and located at the upper end of the outer main tube. The inner wall of the jet angle adjuster is inclined and the middle through groove of the jet angle adjuster is larger at the top and smaller at the bottom. The inner wall of the jet angle adjuster is provided with multiple raised areas and recessed areas at intervals along its circumference. The jet tube is in contact with the raised areas or recessed areas.

[0016] Preferably, the lower end of the spray angle adjuster is provided with a groove, the groove at the lower end of the spray angle adjuster is fitted onto the upper end of the outer main pipe, and the groove at the lower end of the spray angle adjuster is rotatably connected to the upper end of the outer main pipe. The outer sidewall of the groove extends downward to form an extension portion. The irrigation head also includes a transmission assembly for driving the spray angle adjuster to rotate, the transmission assembly including:

[0017] An internal gear is located on the inner side of the extension, and a clearance hole corresponding to the position of the internal gear is provided on the side wall of the outer main tube.

[0018] An external gear, wherein the external gear is located on the outside of the inner main tube;

[0019] The transmission gear meshes with both the internal gear and the external gear.

[0020] Preferably, a support partition is provided in the middle of the inner side of the outer main tube, the inner main tube passes through the support partition and is rotatably connected to the partition, and the transmission gear is located on the top of the support partition via a rotating shaft.

[0021] Preferably, a portion of the inner main pipe located below the supporting partition is a narrow section, and the side wall of the narrow section is provided with a return pipe communicating with the inner main pipe.

[0022] Preferably, the lower outer side of the outer main pipe is provided with a water receiving hopper, the lower end of the inner main pipe is rotatably connected to a venturi tube, the side wall of the venturi tube is provided with a return pipe II communicating with it, and the other end of the return pipe II passes through the outer main pipe and extends to the inner bottom of the water receiving hopper.

[0023] The beneficial effects of this invention are:

[0024] This agricultural water-saving irrigation equipment enables water flow to drive the water wheel and rotate the inner tube, thereby achieving circular irrigation and achieving large-area, uniform irrigation. Furthermore, when it is located at the corner of a square irrigation area, the number of jet nozzles can be adjusted to achieve full coverage of the square irrigation area, ensuring that crops located at the corner of the square irrigation area also receive uniform irrigation. This improves the plantability of the square irrigation area, increases soil utilization, and enhances crop survival rate. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the water supply network and irrigation head corresponding to the square irrigation area in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the axial cross-section of the irrigation head in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the partial sleeve movement structure on the outer main tube in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the jet outlet on the jet pipe and the jet outlet adjustment sleeve sliding from the highest point to the lowest point in an embodiment of the present invention;

[0029] Figure 5 This is a top view schematic diagram of the injection angle adjuster in an embodiment of the present invention;

[0030] Figure 6 for Figure 2 A magnified schematic diagram of part A in the middle.

[0031] Reference numerals: 1. Water supply network pipe; 2. Square irrigation area; 3. Irrigation head; 4. Outer main pipe; 5. Inner main pipe; 6. Water impeller; 7. Jet pipe; 8. Jet outlet regulating sleeve; 9. Jet outlet; 10. Range adjustment area; 11. Pressure plate; 12. Lower push plate; 13. Upper push plate; 14. Main jet outlet; 15. Secondary jet outlet; 16. Main hole position; 17. Secondary hole position; 18. Flexible hose; 19. Jet angle adjuster; 20. Protruding area; 21. Recessed area; 22. Groove; 23. Extension; 24. Internal gear; 25. Clearance hole; 26. External gear; 27. Transmission gear; 28. Support partition; 29. ​​Narrow section; 30. Return pipe one; 31. Water receiving hopper; 32. Venturi tube; 33. Return pipe two. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Example: When irrigating large-scale agricultural planting, a fixed-point pre-buried irrigation network and sprinklers installed on the network are usually used. During irrigation, the sprinklers can be driven to rotate by a corresponding mechanism to achieve a circular irrigation coverage area and increase the irrigated area. However, in order to maximize land use, crops are often not planted in independent circular areas, but in large areas, and the planting area is divided into several square areas for irrigation. This means that the corners of the square areas often cannot be effectively or sufficiently irrigated. If the diameter of the circular irrigation of the sprinkler is increased, although it can cover the corners of the square area, it will cause the sprinklers on both sides of the straight edge of the square area to irrigate repeatedly, resulting in uneven irrigation. Excessive irrigation can also lead to waterlogging, which will also have an adverse effect on the normal growth of crops.

[0034] To address the aforementioned irrigation problem in a square area, this embodiment provides an agricultural water-saving irrigation device, including a water supply network pipe 1 and an irrigation head 3 installed on the water supply network pipe 1. The irrigation head 3 includes:

[0035] An outer main pipe 4 is provided with an inner main pipe 5 along its axial direction. The lower end of the inner main pipe 5 is connected to the interior of the outer main pipe 4. A water wheel 6 is provided on the outer periphery of the lower end of the inner main pipe 5 to drive the inner main pipe 5 to rotate.

[0036] Jet tubes 7, a plurality of the jet tubes 7 are evenly arranged around the upper end of the inner main tube 5 and are connected to the inner main tube 5;

[0037] The jet range adjuster includes a jet outlet adjusting sleeve 8. Multiple jet outlets 9 are provided on the side wall of the upper end of the jet pipe 7 away from the inner main pipe 5. The jet outlet adjusting sleeve 8 is slidably fitted onto the upper end of the jet pipe 7 to adjust the number of jet outlets 9 available for water discharge along its axial direction. The inner wall of the outer main pipe 4 is provided with a sleeve moving structure. The outer main pipe 4 has four range adjustment zones 10 arranged in a circular array with its axis as the center. When the jet pipe 7 moves into the range adjustment zone 10, the sleeve moving structure controls the jet outlet adjusting sleeve 8 to increase the number of jet outlets 9 available for water discharge. When the jet pipe 7 leaves the range adjustment zone 10, the sleeve moving structure controls the adjusting sleeve to decrease the number of jet outlets 9 available for water discharge.

[0038] During irrigation, water is delivered through the water supply network 1 to the outer main pipe 4 of each irrigation head 3. The water flow impacts the water wheel 6, causing the inner main pipe 5 to rotate. The rotation of the inner main pipe 5 causes the jet pipe 7 on it to rotate, thus achieving uniform irrigation within the circular area. The outer main pipe 4 corresponds to the four corners of the square irrigation area 2 as the range adjustment zone 10. The jet outlet adjustment sleeve 8 is slidably installed on the jet pipe 7. By sliding the jet pipe 7 up and down, the number of jet outlets 9 that can discharge water on the jet pipe 7 can be adjusted. When the jet pipe 7 rotates into the range adjustment zone 10, more jet outlets 9 irrigate to cover the corners of the square irrigation area 2. When the jet pipe 7 rotates away from the range adjustment zone 10, some jet outlets 9 are closed to prevent excessive irrigation of the straight edge area of ​​the square irrigation area 2, thereby achieving the purpose of irrigating the entire square irrigation area 2 as evenly as possible.

[0039] Of course, in order to install the irrigation head 3 at the appropriate height, the bottom end of the outer main pipe 4 can be threaded with a section of installation pipe to connect to the water supply network pipe 1.

[0040] The up-and-down sliding of the jet outlet adjusting sleeve 8 can be driven by a linear motor, or it can be achieved by rotating the jet tube 7 in conjunction with a corresponding guide rail structure. For example, in one embodiment, the sleeve moving structure includes:

[0041] Pressure plate 11, wherein the pressure plate 11 is disposed at the lower end of the jet outlet regulating sleeve 8;

[0042] The inner wall of the outer main pipe 4 is provided with a push plate 12 corresponding to the range adjustment area 10. The push plate 12 is located below the pressure plate 11. The push plate 12 is arranged from low to high along the rotation direction of the inner main pipe 5. When the jet pipe 7 enters the range adjustment area 10, the lower side of the push plate 12 contacts the pressure plate 11 first. As the push plate 12 rises, it pushes the pressure plate 11 upward.

[0043] An upper push plate 13 is provided between two adjacent lower push plates 12. The upper push plate 13 is located on the inner wall of the outer main pipe 4 at a position corresponding to the non-range adjustment area 10, and the upper push plate 13 is located above the pressure plate 11. The upper push plate 13 is arranged from high to low along the rotation direction of the inner main pipe 5. When the jet pipe 7 leaves the range adjustment area 10, the higher side of the upper push plate 13 contacts the pressure plate 11 first. As the upper push plate 13 is lowered, it pushes the pressure plate 11 downward.

[0044] When the jet pipe 7 rotates, the lower push plate 12 and the upper push plate 13 cyclically push the pressure plate 11 upward and downward, thereby causing the pressure plate 11 to drive the jet outlet adjusting sleeve 8 to slide up and down in the jet pipe 7. Specifically, the lower push plate 12 can be located on the side of the range adjustment area 10 opposite to the rotation direction of the jet pipe 7, and the upper push plate 13 can be located on the side of the range adjustment area 10 with the rotation direction of the jet pipe 7. The two ends of the upper push plate 13 overlap with the lower push plates 12 on both sides in the vertical direction to facilitate better connection between the lower push plate 12 and the upper push plate 13 of the pressure plate 11. Through the cooperation of the lower push plate 12 and the upper push plate 13 with the pressure plate 11, the rotation of the jet pipe 7 can be used to drive the jet outlet adjusting sleeve 8 to slide up and down. This purely mechanical drive avoids the use of electronic components, making the irrigation process safer.

[0045] Because more jet outlets 9 irrigate when the jet pipe 7 enters the range adjustment zone 10, the irrigation range may overlap when the jet pipe 7 passes through the same range adjustment zone 10 twice. To minimize the irrigation amount in the overlapping area from that in other areas, in one embodiment, the jet outlets 9 include a main jet outlet 14 and secondary jet outlets 15. Multiple secondary jet outlets 15 are provided on the upper and lower sides of the main jet outlet 14. The diameter of the main jet outlet 14 is larger than the diameter of the secondary jet outlets 15. The jet outlet adjusting sleeve 8 has a main hole position 16 in the middle corresponding to the main jet outlet 14. The upper and lower ends of the jet outlet adjusting sleeve 8 are respectively provided with auxiliary holes position 17 corresponding to the auxiliary jet outlet 15. When the jet outlet adjusting sleeve 8 slides to the highest position, the main jet outlet 14 is exposed from the main hole position 16, and the auxiliary jet outlet 15 is exposed from the auxiliary hole position 17. When the jet outlet adjusting sleeve 8 slides to the lowest position, the main jet outlet 14 is exposed from the main hole position 16, and the auxiliary jet outlet 15 is closed by the jet outlet adjusting sleeve 8.

[0046] By setting smaller diameter secondary jet ports 15 on the upper and lower sides of the main jet port 14, the irrigation range of the jet pipe 7 in the range adjustment zone 10 is increased on the one hand, and the smaller diameter secondary jet ports 15 have a smaller flow rate, which can avoid excessive irrigation water in the overlapping area and make irrigation more uniform. Compared to the main jet outlet 14, the main orifice 16 has a sufficiently large area, ensuring that the jet outlet regulating sleeve 8 does not cover the main jet outlet 14 when moving up and down. When the jet pipe 7 enters the range adjustment zone 10, the secondary orifice 17 gradually moves to make way for the secondary jet outlet 15, so that the coverage area of ​​the jet pipe 7 gradually increases as it enters the range adjustment zone 10, until the jet pipe 7 is directly opposite the corner of the square irrigation area 2. At this time, the lower push plate 12 reaches its maximum height, and the upper push plate 13 also reaches its maximum height. Then, the upper push plate 13 pushes the pressure plate 11 downward, and the secondary orifice 17 gradually shifts away from the secondary jet outlet 15. The jet outlet regulating sleeve 8 gradually closes the secondary jet outlet 15, and the coverage area of ​​the jet pipe 7 gradually decreases.

[0047] To allow the angle between the jet pipe 7 and the inner main pipe 5 to be variable during movement, thereby creating a wave-like motion during rotation and further enhancing the uniformity of irrigation, in one embodiment, the lower end of the jet pipe 7 is rotatably connected to the outer wall of the inner main pipe 5, and the jet pipe 7 and the inner main pipe 5 are connected by a flexible hose 18. The irrigation head 3 also includes:

[0048] The jet angle adjuster 19 is annular and located at the upper end of the outer main pipe 4. The inner wall of the jet angle adjuster 19 is inclined and the middle through groove of the jet angle adjuster 19 is larger at the top and smaller at the bottom. The inner wall of the jet angle adjuster 19 is provided with a plurality of protruding areas 20 and recessed areas 21 at intervals along its circumference. The jet pipe 7 is in contact with the protruding areas 20 or the recessed areas 21.

[0049] When the jet pipe 7 rotates, due to the different support positions of the raised area 20 and the recessed area 21, it can rotate around the rotation axis connected to the inner main pipe 5 within a certain angle range. That is, when the jet pipe 7 revolves around the axis of the inner main pipe 5 in the horizontal direction, it can also rotate in the vertical direction at a certain angle, so that the irrigation path forms a wave-shaped change, which can cover the near and far areas of the irrigation head 3.

[0050] To avoid a constant wavy irrigation path and further increase irrigation uniformity, in one embodiment, the lower end of the spray angle adjuster 19 is provided with a groove 22. The groove 22 at the lower end of the spray angle adjuster 19 is fitted onto the upper end of the outer main pipe 4, and the groove 22 at the lower end of the spray angle adjuster 19 is rotatably connected to the upper end of the outer main pipe 4. The outer sidewall of the groove 22 extends downward to form an extension 23. The irrigation head 3 also includes a transmission assembly for driving the spray angle adjuster 19 to rotate. The transmission assembly includes:

[0051] An internal gear 24 is located on the inner side of the extension 23, and a clearance hole 25 corresponding to the position of the internal gear 24 is provided on the side wall of the outer main tube 4.

[0052] External gear 26, the external gear 26 is located on the outside of the inner main tube 5;

[0053] The transmission gear 27 meshes with the internal gear 24 and the external gear 26 respectively.

[0054] The jet angle adjuster 19 is rotatably connected to the upper end of the outer main pipe 4 via the groove 22. The jet angle adjuster 19 and the outer main pipe 4 are coaxially connected and can rotate around their axis. When the inner main pipe 5 rotates, the outer gear 26 drives the inner gear 24 to rotate through the transmission gear 27, thereby driving the jet angle adjuster 19 to rotate. The rotation of the jet angle adjuster 19 can change the position of the raised area 20 and the recessed area 21, thereby avoiding the monotonous wavy irrigation path of the jet nozzle 9 on the jet pipe 7.

[0055] Although adding a transmission component can avoid the problem of a single wavy irrigation path, in order to prevent the wavy irrigation path of the jet nozzle 9 from repeating a previous path after a few rotations, and to prevent the irrigation width of the jet nozzle 9 from being insufficient to cover the area between two adjacent irrigation paths, which would still lead to uneven irrigation, there are certain requirements for the transmission ratio between the external gear 26 and the internal gear 24. The transmission ratio should be non-1:N2 or non-N2:1 as much as possible.

[0056] To facilitate the installation and rotation of the inner tube 5, in one embodiment, a support partition 28 is provided in the middle of the inner side of the outer tube 4. The inner tube 5 passes through the support partition 28 and is rotatably connected to the partition. The transmission gear 27 is located on the top of the support partition 28 via a rotating shaft.

[0057] In one embodiment, a portion of the inner main pipe 5 located below the supporting partition 28 is a narrow section 29. The side wall of the narrow section 29 is provided with a return pipe 30 communicating with the inner main pipe 5. After the water flows into the narrow section 29, the flow velocity increases, thereby creating a negative pressure relative to the outer main pipe 4. Consequently, the water in the outer main pipe 4 is drawn into the inner main pipe 5 through the return pipe 30, causing the water in the outer main pipe 4 to flow from bottom to top, which in turn impacts the water wheel 6 and drives the inner main pipe 5 to rotate.

[0058] During irrigation, a small amount of water may drip from the jet nozzle 9 onto the area around the irrigation head 3. If this water is not collected, it can cause the crops around the irrigation head 3 to become waterlogged. Therefore, in one embodiment, a water collection hopper 31 is provided on the lower outer side of the outer main pipe 4, and a venturi tube 32 is rotatably connected to the lower end of the inner main pipe 5. A return pipe 33 communicating with the side wall of the venturi tube 32 is provided, and the other end of the return pipe 33 extends through the outer main pipe 4 to the inner bottom of the water collection hopper 31.

[0059] After the water enters the venturi tube 32, the flow velocity increases and the pressure decreases. The pressure at the end of the return pipe 33 connected to the venturi tube 32 is lower than that at the end in the water receiving hopper 31. The return pipe 33 will draw the water in the water receiving hopper 31 into the inner main pipe 5 for irrigation.

[0060] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An agricultural water-saving irrigation device, comprising a water supply network and an irrigation head disposed on the water supply network, characterized in that, The irrigation head includes: An outer main pipe is provided, and an inner main pipe is provided along its axial direction inside the outer main pipe. The lower end of the inner main pipe is connected to the interior of the outer main pipe, and a water wheel is provided on the outer periphery of the lower end of the inner main pipe for driving the inner main pipe to rotate. A plurality of jet tubes are evenly arranged around the upper end of the inner main tube and are connected to the inner main tube. A jet range adjuster includes a jet outlet adjusting sleeve. Multiple jet outlets are provided on the side wall of the upper end of the jet pipe away from the inner main pipe. The jet outlet adjusting sleeve is slidably fitted onto the upper end of the jet pipe to adjust the number of jet outlets available for water discharge along its axial direction. The inner wall of the outer main pipe is provided with a sleeve moving structure. The outer main pipe has four range adjustment zones arranged in a circular array with its axis as the center. When the jet pipe moves into the range adjustment zone, the sleeve moving structure controls the jet outlet adjusting sleeve to increase the number of jet outlets available for water discharge. When the jet pipe leaves the range adjustment zone, the sleeve moving structure controls the adjusting sleeve to decrease the number of jet outlets available for water discharge. The sleeve moving structure includes: A pressure plate is located at the lower end of the jet outlet regulating sleeve; The inner wall of the outer main pipe is provided with a push plate corresponding to the range adjustment area. The push plate is located below the pressure plate. The push plate is arranged from low to high along the rotation direction of the inner main pipe. When the jet pipe enters the range adjustment area, the lower side of the push plate contacts the pressure plate first. As the push plate rises, it pushes the pressure plate upward. An upper push plate is provided between two adjacent lower push plates. The upper push plate is located on the inner wall of the outer main pipe at a position corresponding to the non-range adjustment area, and the upper push plate is located above the pressure plate. The upper push plate is set from high to low along the rotation direction of the inner main pipe. When the jet tube leaves the range adjustment area, the higher side of the upper push plate contacts the pressure plate first, and as the upper push plate lowers, it pushes the pressure plate downward. The jet outlet includes a main jet outlet and secondary jet outlets. Multiple secondary jet outlets are respectively provided on the upper and lower sides of the main jet outlet. The diameter of the main jet outlet is larger than the diameter of the secondary jet outlets. The middle part of the jet outlet adjusting sleeve is provided with a main hole corresponding to the main jet outlet. The upper and lower ends of the jet outlet adjusting sleeve are respectively provided with secondary holes corresponding to the secondary jet outlets. When the jet outlet adjusting sleeve slides to the highest position, the main jet outlet is exposed from the main hole, and the secondary jet outlets are exposed from the secondary holes. When the jet outlet adjusting sleeve slides to the lowest position, the main jet outlet is exposed from the main hole, and the secondary jet outlets are closed by the jet outlet adjusting sleeve. The lower end of the jet pipe is rotatably connected to the outer wall of the inner main pipe, and the jet pipe and the inner main pipe are connected by a flexible hose. The irrigation head also includes: The jet angle adjuster is annular and located at the upper end of the outer main tube. The inner wall of the jet angle adjuster is inclined and the middle through groove of the jet angle adjuster is larger at the top and smaller at the bottom. The inner wall of the jet angle adjuster is provided with multiple raised areas and recessed areas at intervals along its circumference. The jet tube is in contact with the raised areas or recessed areas.

2. The agricultural water-saving irrigation equipment according to claim 1, characterized in that, The lower end of the spray angle adjuster is provided with a groove, which is fitted onto the upper end of the outer main pipe, and the groove at the lower end of the spray angle adjuster is rotatably connected to the upper end of the outer main pipe. The outer sidewall of the groove extends downward to form an extension. The irrigation head also includes a transmission assembly for driving the spray angle adjuster to rotate, the transmission assembly including: An internal gear is located on the inner side of the extension, and a clearance hole corresponding to the position of the internal gear is provided on the side wall of the outer main tube. An external gear, wherein the external gear is located on the outside of the inner main tube; The transmission gear meshes with both the internal gear and the external gear.

3. The agricultural water-saving irrigation equipment according to claim 2, characterized in that, The inner side of the outer tube is provided with a support partition, the inner tube passes through the support partition and is rotatably connected to the partition, and the transmission gear is located on the top of the support partition via a rotating shaft.

4. The agricultural water-saving irrigation equipment according to claim 3, characterized in that, The inner main pipe has a narrow section located below the supporting partition, and the side wall of the narrow section is provided with a return pipe communicating with the inner main pipe.

5. The agricultural water-saving irrigation equipment according to claim 4, characterized in that, The lower outer side of the outer main pipe is provided with a water receiving hopper, and the lower end of the inner main pipe is rotatably connected to a Venturi tube. The side wall of the Venturi tube is provided with a return pipe II communicating with it, and the other end of the return pipe II extends through the outer main pipe to the bottom of the inner side of the water receiving hopper.

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