Multifunctional micro-wet irrigation pipe set for degraded grassland restoration

Abstract

The utility model belongs to grassland ecological restoration and water -saving irrigation technical field especially relates to a multi -functional micro -moist irrigation pipe group for degraded grassland restoration, in the light of the problem that the existing micro -moist irrigation system cannot realize long -distance along -the -way pressure grading regulation and cannot carry out soil improvement simultaneously, the present scheme is presented, including the water supply main pipe, water supply branch pipe and micro -moist pipe that are communicated in proper order, the water supply branch pipe body three equal division parts are connected with pressure regulating pipe, the pressure regulating pipe is connected with pressure regulating cavity casing, the pressure regulating cavity casing is set up with pressure regulating valve core in the activity, the pressure regulating cavity casing upper end is connected with pressure regulating cavity upper cover in the activity, the bottom support plate bottom end middle part is connected with ground insertion pipe, and the ground insertion pipe body is provided with a plurality of micropores and is provided with soil amendment capsules in the pipe. The utility model realizes along -the -way grading steady voltage through pressure regulating pipe, realizes irrigation water deep -layer guide and soil improvement synchronous through bottom support plate and ground insertion pipe, is applicable to the degraded grassland restoration engineering.

Description

Technical Field

[0001] This utility model relates to an irrigation pipe assembly, specifically a multifunctional micro-moistening irrigation pipe assembly for degraded grassland restoration, belonging to the field of grassland ecological restoration and water-saving irrigation technology. Background Technology

[0002] Micro-irrigation is a novel underground irrigation technology that continuously supplies water to the soil in small amounts through slow infiltration. The micro-irrigation pipe is a flexible water supply device made with a high-polymer semi-permeable membrane as its core material. The membrane wall has approximately 100,000 micropores per square centimeter. Water molecules migrate out of the pipe through these micropores under the drive of potential energy, achieving micro-volume, continuous, and uninterrupted underground irrigation. Micro-irrigation technology has already seen some development in the field of water-saving irrigation.

[0003] Various micro-irrigation systems have been disclosed in the prior art. For example, a micro-irrigation system disclosed in CN204305746U includes a water storage device connected to an inlet pipe and several parallel micro-irrigation pipes buried underground. One side of the water storage device is connected to a water supply pipe via a bypass through a water supply pipeline. One end of the bypass is connected to a branch pipe formed by connecting several sections of PE pipe via tees. One end of each tee is connected to several micro-irrigation pipes. Another example is a buried micro-irrigation device disclosed in CN206791247U, which includes a water source, a pipeline pump, a filter, an inlet pipeline mechanism, and several irrigation pipeline mechanisms. The irrigation pipeline mechanism includes several Y-type tees, several irrigation pipes, and stainless steel crosses. The irrigation pipes are all composed of micro-irrigation pipe components. The outer wall of the irrigation pipe is provided with a shielding mechanism, which includes a first shield and a second shield arranged opposite to each other. However, grassland restoration typically requires the installation of irrigation networks across large areas of degraded grassland. Existing micro-irrigation systems often employ fixed connections, with each micro-irrigation pipe rigidly connected via tees or straight sections. This lack of adaptability prevents flexible adjustments to pipe density and routing based on the terrain and restoration needs of the degraded grassland. Furthermore, long-distance micro-irrigation pipelines suffer from insufficient water pressure and uneven flow rates due to frictional losses. As the length of the supply branch pipes increases, the irrigation water pressure gradually decreases, resulting in significantly lower flow rates at the far end compared to the near end, severely impacting irrigation uniformity and grassland restoration effectiveness. Finally, degraded grassland soils are often infertile and severely compacted; existing micro-irrigation systems can only supply water and cannot simultaneously improve soil structure and fertility. Utility Model Content

[0004] This invention provides a multifunctional micro-irrigation pipe assembly for degraded grassland restoration, addressing the problems of existing micro-irrigation systems being unable to achieve graded pressure adjustment along long distances and simultaneously improve soil conditions.

[0005] The present invention achieves the above objectives through the following technical solution: a multifunctional micro-irrigation pipe assembly for degraded grassland restoration, comprising a water supply main pipe, a water supply branch pipe and a micro-irrigation pipe connected in sequence, wherein the water supply branch pipe is connected to both sides of the water supply main pipe and the micro-irrigation pipe is connected to both sides of the water supply branch pipe. The water supply branch pipe is connected to a pressure regulating pipe at three equal sections. The pressure regulating pipe is connected to a pressure regulating chamber shell. A guide pipe is also connected to the pressure regulating pipe. One end of the guide pipe is connected to the inside of the pressure regulating pipe, and the other end of the guide pipe is connected to the lower chamber of the pressure regulating chamber shell. The guide pipe introduces the water pressure of the downstream section of the water supply branch pipe into the lower chamber of the pressure regulating chamber shell to act on the lower surface of the pressure regulating diaphragm. A pressure regulating valve core is movably installed inside the pressure regulating chamber shell, and the lower end of the pressure regulating valve core is movably inserted into the pressure regulating pipe. A pressure regulating diaphragm is connected between the pressure regulating valve core and the pressure regulating chamber shell. A pressure regulating chamber cover is movably connected to the upper end of the opening of the pressure regulating chamber shell. A pressure regulating spring is provided between the pressure regulating chamber cover and the pressure regulating valve core. When the downstream water pressure increases, the pressure regulating valve core moves upward against the elastic force of the pressure regulating spring. When the downstream water pressure decreases, the pressure regulating valve core moves downward by the elastic force of the pressure regulating spring. The micro-lubricating tube has an arc-shaped bottom support plate at the bottom. The bottom middle part of the bottom support plate is connected to the ground insertion tube. The ground insertion tube has several micro-holes and soil conditioner capsules are placed inside the tube.

[0006] As a further improvement of this utility model: several main pipe interfaces are provided on both sides of the main water supply pipe, and the main pipe interfaces on both sides are staggered. One end of the water supply branch pipe is threaded into the main pipe interface. The main pipe interface not connected to the water supply branch pipe is fitted with a threaded plug, and the threaded plug seals the main pipe interface by threading.

[0007] As a further improvement of this utility model: several branch pipe interfaces are provided on both sides of the water supply branch pipe, and the branch pipe interfaces on both sides are staggered. The connecting end of the micro-lubricating pipe is connected to a connecting seat, and the connecting seat is sealed on the branch pipe interface.

[0008] As a further embodiment of this utility model: the micro-lubricating tube includes a coaxially sleeved permeable protective sleeve and a semi-permeable membrane hose. The semi-permeable membrane hose is disposed inside the permeable protective sleeve, and an annular gap is left between the semi-permeable membrane hose and the permeable protective sleeve. Several nano-scale micropores are formed on the wall of the semi-permeable membrane hose. A spiral support plate is provided between the semi-permeable membrane hose and the permeable protective sleeve. The spiral support plate extends spirally along the length of the semi-permeable membrane hose. The inner edge of the spiral support plate is fixedly connected to the outer wall of the semi-permeable membrane hose, and the outer edge of the spiral support plate abuts against the inner wall of the permeable protective sleeve. The spiral support plate divides the annular gap between the semi-permeable membrane hose and the permeable protective sleeve into a spiral water flow channel.

[0009] As a further embodiment of this utility model: the pressure regulating pipe is a three-way pipe structure, with the middle port of the pressure regulating pipe facing vertically upward. The lower end of the pressure regulating chamber shell is fixedly connected to the middle port of the pressure regulating pipe. A valve core guide ring is provided inside the pressure regulating chamber shell. The valve core guide ring is fixedly connected to the docking part between the pressure regulating chamber shell and the pressure regulating pipe. The pressure regulating valve core passes through the valve core guide ring and slides with the valve core guide ring. The lower end of the pressure regulating valve core passes through the valve core guide ring and extends into the pressure regulating pipe. A water passage gap is formed between the lower outer wall of the pressure regulating valve core and the inner wall of the pressure regulating pipe. A limit hole is opened in the lower section of the pressure regulating valve core. A limit rod is fixedly connected to the bottom surface of the pressure regulating pipe. The limit rod moves through the limit hole and limits the axial movement stroke of the pressure regulating valve core.

[0010] As a further embodiment of this utility model: the pressure regulating chamber cover is movably screwed onto the upper end of the opening of the pressure regulating chamber housing via a threaded connection. A spring positioning boss is integrally formed at the center of the lower surface of the pressure regulating chamber cover. A spring positioning groove is provided at the top of the pressure regulating valve core. The upper end of the pressure regulating spring is sleeved and abuts against the outer wall of the spring positioning boss. The lower end of the pressure regulating spring extends into the spring positioning groove and abuts against the bottom surface of the spring positioning groove. The pressure regulating diaphragm divides the inner cavity of the pressure regulating chamber housing into an upper chamber and a lower chamber. The pressure regulating spring is located in the upper chamber. The preload of the pressure regulating spring is set to different values ​​according to the installation position of the pressure regulating chamber housing on the water supply branch pipe.

[0011] As a further improvement of this utility model, the lower end of the pressure regulating valve core is conical or hemispherical, and the effective area of ​​the water passage gap in the pressure regulating pipe is gradually reduced when the lower end of the pressure regulating valve core moves downward.

[0012] As a further embodiment of this utility model: the bottom support plate extends along the length of the micro-lubricating tube, and the two sides of the bottom support plate are connected with fixing straps for fixing the tube body of the micro-lubricating tube. The inner side of the bottom support plate is provided with a water collection groove, which is in contact with the outer wall of the lower half of the micro-lubricating tube. The upper end of the ground insertion tube is fixedly connected to the lowest point of the bottom surface of the water collection groove. The lower end of the ground insertion tube is connected with a pointed cone. The tube body of the ground insertion tube is provided with several micro-holes. The water seeping out of the micro-lubricating tube is collected in the water collection groove, and then flows into the ground insertion tube through the port at the upper end of the ground insertion tube, and seeps out into the soil around the ground insertion tube through the micro-holes on the tube body.

[0013] The beneficial effects of this utility model are: 1. The main water supply pipe set in this utility model serves as the main water conveyance channel for the entire micro-irrigation pipe group. Water supply branch pipes are connected to both sides of the pipe body. The double-sided branch layout doubles the service area of ​​a single main water supply pipe compared to the single-sided pipe laying method, effectively reducing the laying length of the main pipeline and the project investment. Each water supply branch pipe extends outward from both sides of the main water supply pipe in a branch shape, so that the irrigation water is delivered to the degraded grassland area at different distances from the main water supply pipe. The micro-irrigation pipe is connected to both sides of the water supply branch pipe to further diffuse and infiltrate the irrigation water into the soil of the grassland on both sides. Through the three-level progressive diversion structure of the main water supply pipe, the water supply branch pipe and the micro-irrigation pipe, an irrigation network system with a large coverage area and uniform hydraulic distribution is formed, which effectively overcomes the problem of large-area uniform irrigation in the degraded grassland restoration project. 2. This utility model achieves graded adjustment of water pressure along the entire water supply branch pipe by connecting three equal sections of the branch pipe. The pressure regulating valve core changes the size of the water passage gap in the regulating pipe by varying the depth of its lower end extending into the regulating pipe, thereby achieving real-time adjustment of the hydraulic resistance of the irrigation water flowing through the regulating pipe. The pressure regulating diaphragm seals and separates the inner cavity of the pressure regulating chamber housing and converts the change in downstream water pressure into a driving force to move the pressure regulating valve core. The pressure regulating chamber cover can be screwed in or out relative to the pressure regulating chamber housing to adjust the pre-compression of the pressure regulating spring. The downward elastic force applied by the pressure regulating spring to the pressure regulating valve core forms a dynamic balance with the upward thrust of the downstream water pressure acting on the pressure regulating diaphragm. When the water pressure in the downstream section of the water supply branch pipe decreases due to the increase in the pipe length, the pressure regulating valve core adjusts the pressure. The spring force pushes the pressure regulating valve core downward, causing its lower end to extend further into the pressure regulating pipe, reducing the effective area of ​​the water passage gap and increasing local resistance, thereby increasing the water pressure in the downstream pipe section and achieving automatic pressure stabilization and compensation. When the water pressure in the downstream pipe section of the water supply branch increases due to inlet pressure fluctuations, the increased water pressure pushes the pressure regulating diaphragm to drive the pressure regulating valve core to overcome the spring force and move upward, causing the lower end of the pressure regulating valve core to retract from the pressure regulating pipe, increasing the effective area of ​​the water passage gap and reducing local resistance, thereby reducing the water pressure in the downstream pipe section. This ensures that the water pressure at each position along the entire water supply branch is controlled near its preset target value, effectively solving the technical problems of insufficient end water pressure and uneven flow rate caused by friction loss along the long-distance micro-irrigation pipeline. 3. The bottom support plate of this utility model provides a supporting surface for the micro-irrigation pipe. At the same time, the irrigation water seeping out of the micro-irrigation pipe is collected along the arc-shaped inner wall of the bottom support plate under the action of gravity and flows naturally into the ground-inserted pipe at the middle of the bottom end. Then, it slowly seeps into the deep soil through the micropores on the ground-inserted pipe. This realizes the guidance of the shallow irrigation water of the micro-irrigation pipe to the deep grass root distribution area, which expands the effective depth of irrigation water. The irrigation water flowing through the ground-inserted pipe continuously washes and wets the soil conditioner capsule, so that the conditioner components in the soil conditioner capsule are released into the deep soil through the micropores on the ground-inserted pipe along with the irrigation water. This realizes the simultaneous occurrence of irrigation water supply and soil improvement. The combination of the shallow continuous water supply of the micro-irrigation pipe, the deep water guidance and supplementary irrigation of the ground-inserted pipe, and the slow-release improvement of the soil conditioner capsule improves the restoration efficiency of degraded grassland and irrigation utilization efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the interconnection structure of the main water supply pipe, branch water supply pipe, and micro-lubricating pipe of this utility model. Figure 3 This is a schematic diagram of the disassembled structure of the main body interface and threaded plug of this utility model; Figure 4 This is a schematic diagram of the connection structure between the water supply branch pipe, the micro-lubricating pipe, and the pressure regulating pipe of this utility model. Figure 5 This is a schematic diagram of the disassembled structure of the branch pipe interface and the docking seat of this utility model; Figure 6 This is a schematic cross-sectional view of the pressure regulating tube and the pressure regulating cavity housing of this utility model; Figure 7 This is a schematic diagram of the connection structure between the ground insertion pipe and the bottom support plate of this utility model; Figure 8 This is a schematic diagram of the cross-sectional structure of the ground insertion pipe and the bottom support plate of this utility model; Figure 9 This is a schematic diagram of the cross-sectional structure of the micro-lubricating tube of this utility model.

[0015] In the diagram: 1. Main water supply pipe; 11. Main pipe connector; 12. Threaded plug; 2. Branch water supply pipe; 21. Branch pipe connector; 3. Micro-lubricating pipe; 31. Water-permeable protective sleeve; 32. Semi-permeable membrane hose; 33. Spiral support plate; 34. Connecting seat; 4. Pressure regulating pipe; 41. Pressure regulating chamber housing; 42. Pressure regulating chamber cover; 43. Conductor pipe; 44. Spring positioning boss; 45. Pressure regulating spring; 46. Pressure regulating valve core; 47. Spring positioning groove; 48. Valve core guide ring; 49. Limiting hole; 410. Limiting rod; 411. Pressure regulating diaphragm; 5. Ground insertion pipe; 51. Bottom support plate; 52. Fixing strap; 53. Cone; 54. Water collection inner tank; 55. Soil conditioner capsule. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1 like Figures 1 to 8 As shown, a multifunctional micro-irrigation pipe assembly for degraded grassland restoration includes a main water supply pipe 1, a branch water supply pipe 2, and a micro-irrigation pipe 3 connected in sequence. The branch water supply pipe 2 is connected to both sides of the main water supply pipe 1, and the micro-irrigation pipe 3 is connected to both sides of the branch water supply pipe 2. Each branch water supply pipe 2 extends outward from both sides of the main water supply pipe 1 in a branch-like manner, so that irrigation water can be delivered to degraded grassland areas at different distances from the main water supply pipe 1, achieving uniform irrigation coverage of a large area of ​​grassland. The micro-irrigation pipe 3 is connected to both sides of the branch water supply pipe 2, further diffusing and infiltrating the irrigation water from the branch water supply pipe 2 into the grassland soil on both sides. Through the three-level progressive diversion structure of the main water supply pipe 1, the branch water supply pipe 2, and the micro-irrigation pipe 3, an irrigation pipe network system with a large coverage area and uniform water distribution is formed, effectively overcoming the problem of uniform irrigation of a large area in degraded grassland restoration projects. The water supply branch pipe 2 is connected to a pressure regulating pipe 4 at three equal sections. A pressure regulating chamber housing 41 is connected to the body of the pressure regulating pipe 4. A pressure regulating valve core 46 is movably installed inside the pressure regulating chamber housing 41, with its lower end movably inserted into the pressure regulating pipe 4. A pressure regulating diaphragm 411 connects the pressure regulating valve core 46 and the pressure regulating chamber housing 41. A pressure regulating chamber cover 42 is movably connected to the upper end of the opening of the pressure regulating chamber housing 41. A pressure regulating spring 45 is provided between the pressure regulating chamber cover 42 and the pressure regulating valve core 46. When the downstream water pressure increases, the pressure regulating valve core 46 moves upward against the elastic force of the pressure regulating spring 45. When the downstream water pressure decreases, the pressure regulating valve core 46 moves upward. When the pressure is low, the regulating spring 45 moves downwards, and the regulating pipe 4 connects to the three equal parts of the water supply branch pipe 2, realizing graded regulation of the water pressure along the entire water supply branch pipe 2. The regulating chamber housing 41 provides installation and operating space for the regulating valve core 46 and the regulating diaphragm 411. The regulating valve core 46 can move up and down axially within the regulating chamber housing 41, changing the size of the water passage gap in the regulating pipe 4 by varying the depth of its lower end extending into the regulating pipe 4, thereby realizing real-time regulation of the hydraulic resistance of the irrigation water flowing through the regulating pipe 4. The regulating diaphragm 411 seals and separates the inner cavity of the regulating chamber housing 41 and The change in downstream water pressure is converted into a driving force to move the pressure regulating valve core 46. The pressure regulating chamber cover 42 can be screwed in or out relative to the pressure regulating chamber housing 41 to adjust the pre-compression of the pressure regulating spring 45. The downward elastic force exerted by the pressure regulating spring 45 on the pressure regulating valve core 46 forms a dynamic balance with the upward thrust of the downstream water pressure on the pressure regulating diaphragm 411. When the water pressure in the downstream section of the water supply branch pipe 2 decreases due to the increase in friction distance, the elastic force of the pressure regulating spring 45 pushes the pressure regulating valve core 46 downward, causing its lower end to extend further into the pressure regulating pipe 4, reducing the effective area of ​​the water passage gap to increase local resistance, thereby improving the water pressure in the downstream section. The system automatically stabilizes and compensates for pressure fluctuations. When the water pressure in the downstream section of the water supply branch pipe 2 increases due to inlet pressure fluctuations, the increased water pressure pushes the pressure regulating diaphragm 411 to drive the pressure regulating valve core 46 to move upward against the elastic force of the pressure regulating spring 45. This causes the lower end of the pressure regulating valve core 46 to retract from the pressure regulating pipe 4, increasing the effective area of ​​the water passage gap to reduce local resistance and thus reducing the water pressure in the downstream section. This ensures that the water pressure at each position along the entire water supply branch pipe 2 is controlled near its preset target value, effectively solving the technical problem of insufficient end water pressure and uneven flow rate caused by friction loss along the long-distance micro-irrigation pipeline. The micro-lubricating tube 3 has an arc-shaped bottom support plate 51 at its lower end. The bottom center of the bottom support plate 51 is connected to a ground-insertion tube 5. The ground-insertion tube 5 has several micropores, and a soil conditioner capsule 55 is placed inside it. It should be noted that the soil conditioner capsule 55 can be the microcapsule-type soil conditioner containing microorganisms disclosed in publication number CN113265254A, as well as its preparation method and application. The arc-shaped structure of the bottom support plate 51 provides a supporting surface for the micro-lubricating tube 3, preventing flattening deformation due to upper soil pressure after burial, and ensuring the circular cross-sectional shape and normal water discharge performance of the semi-permeable membrane pipe inside the micro-lubricating tube 3. The ground-insertion tube 5 fixes the bottom support plate 51 and the micro-lubricating tube 3 at a predetermined burial depth, and the micropores in the body of the ground-insertion tube 5 allow the ground-insertion tube to... Water flow channels are formed inside and outside the pipe 5. Irrigation water seeping from the micro-irrigation pipe 3 is collected along the arc-shaped inner wall of the bottom support plate 51 under the action of gravity and flows naturally into the ground-inserted pipe 5. Then, it slowly seeps into the deep soil through the micropores on the ground-inserted pipe 5, thus guiding the shallow irrigation water of the micro-irrigation pipe 3 to the deep grass root distribution area, expanding the effective depth of irrigation water. In addition, the irrigation water flowing through the ground-inserted pipe 5 continuously washes and wets the soil conditioner capsule 55, so that the conditioner components in the soil conditioner capsule 55 are released into the deep soil along with the irrigation water through the micropores on the ground-inserted pipe 5. This achieves the simultaneous operation of irrigation water supply and soil improvement. The combination of shallow continuous water supply from the micro-irrigation pipe 3, deep water guidance and supplementary irrigation from the ground-inserted pipe 5, and slow-release improvement from the soil conditioner capsule 55 improves the restoration efficiency of degraded grassland and irrigation utilization efficiency.

[0018] It should be noted that the automatic pressure stabilization principle of the pressure regulating component in this embodiment is based on the well-known "pressure feedback-elastic element balance" mechanism in the field of fluid control. That is, the diaphragm senses the change in downstream water pressure, and uses the elastic reaction force of the spring to form a dynamic balance with the hydraulic pressure, driving the valve core to generate axial displacement to change the effective flow area of ​​the water passage gap, thereby automatically adjusting the local resistance and maintaining a constant downstream pressure. For example, the pressure regulator for water-saving irrigation disclosed in CN2407577Y consists of a shell, a pressure regulating element, a spring, a rubber diaphragm, and a pressure cap. It senses changes in water pressure through the rubber diaphragm and, in conjunction with the elastic force of the spring, achieves "when the upstream pressure changes significantly, the downstream pressure remains basically unchanged." It can be used at the inlet of the branch pipe or capillary tube in a micro-irrigation or sprinkler irrigation system. Another example is the adaptive pipeline pressure regulating valve and its adaptive irrigation system disclosed in CN112161093A. It adopts a structure in which the pressure regulating valve plate and the cavity cooperate. It is "suitable for different pipeline lengths to solve the problem of unstable fluid pressure in the pipeline, which leads to uneven outlet flow and inability to regulate." That is, it uses a pressure feedback structure of diaphragm, spring, and valve core to achieve automatic pressure regulation of the fluid pipeline, which is a mature technical means known to those skilled in the art.

[0019] In this embodiment, the effective pressure-bearing area of ​​the pressure regulating diaphragm 411 is denoted as A, the stiffness of the pressure regulating spring 45 is denoted as k, the preload of the pressure regulating spring 45 is denoted as F0, the upward displacement of the pressure regulating valve core 46 from the reference position is denoted as x, and the pressure introduced into the lower chamber of the pressure regulating chamber housing 41 via the downstream section of the water supply branch pipe 2 through the connecting pipe 43 is denoted as P. Ignoring the friction between the pressure regulating valve core 46 and the valve core guide ring 48, the upward hydraulic pressure on the lower surface of the pressure regulating diaphragm 411 is F. p =P*A, the downward force F exerted by the pressure regulating spring 45 on the pressure regulating valve core 46 is P. s =F0 + k*x. The dynamic equilibrium condition is: P*A=F0+k*x; The target stable pressure value P0 is determined by the preload F0 and the effective pressure-bearing area A: P0 = F0 / A; When P > P0, x = (P*A - F0) / k > 0, and the pressure regulating valve core 46 moves upward; when P < P0, x = (P*A - F0) / k < 0, and the pressure regulating valve core 46 moves downward.

[0020] A water passage gap is formed between the lower outer wall of the pressure regulating valve core 46 and the inner wall of the pressure regulating pipe 4. The effective flow area Ag and the axial displacement x of the valve core satisfy the following: Ag = Ag0 + Kg * x; Where Ag0 is the reference water passage area, and Kg is the area-displacement coefficient. For the conical lower end, Kg≈π·D·tanα, where D is the inner diameter of the pressure regulating pipe 4, and α is the half-angle of the conical surface; for the hemispherical lower end, Kg can be approximately determined according to the geometric relationship of the annular gap formed by the hemisphere and the inner wall of the pressure regulating pipe. When P decreases, x is negative, Ag decreases, local resistance increases, and downstream pressure rises; when P increases, x is positive, Ag increases, local resistance decreases, and downstream pressure falls.

[0021] As an example, the effective pressure-bearing area A of the pressure regulating diaphragm 411 can be 100-2000 mm². 2 The stiffness k of the pressure regulating spring 45 can be taken as 5-100 N / mm, the preload F0 can be taken as 10-500 N, the target stable pressure value P0 can be taken as 0.05-0.5 MPa, the displacement x of the pressure regulating valve core 46 can be taken as 0-5 mm, and the reference water passage area Ag0 can be taken as 10-200 mm². 2 The area-displacement coefficient (kg) can be taken as 5-100mm. 2 / mm. For example, A=200mm 2 If F0 = 40 N, then P0 = 0.2 MPa; k = 2 N / mm, when P = 0.22 MPa, F p=44N, x=2mm, Ag increases compared to the reference value, local resistance decreases; when P=0.18MPa, F p =36N, x=-2mm, Ag decreases compared to the reference value, and local resistance increases. By selecting A, k, F0 and the lower cone angle α of the pressure regulating valve core 46, the downstream pressure can be controlled near P0, achieving automatic pressure stabilization and compensation.

[0022] Example 2 Improvements based on Example 1: like Figures 1 to 5 As shown, several main pipe interfaces 11 are provided on both sides of the main water supply pipe 1, and the main pipe interfaces 11 on both sides are staggered. One end of the water supply branch pipe 2 is threaded into the main pipe interface 11. The main pipe interface 11 not connected to the water supply branch pipe 2 is fitted with a threaded plug 12. The threaded plug 12 seals the main pipe interface 11 by screwing it in. The staggered arrangement of the main pipe interfaces 11 ensures that the water supply branch pipes 2 connected to both sides of the main water supply pipe 1 do not overlap in space, and also ensures that the main water supply pipe 1 is staggered in each main pipe interface 11. The stress distribution of the pipe section at the opening of interface 11 is more uniform. The threaded connection between the water supply branch pipe 2 and the main pipe interface 11 ensures the connection strength and sealing between the water supply branch pipe 2 and the main water supply pipe 1, and facilitates on-site installation and disassembly. The threaded plug 12 allows for flexible selection of opening part of the main pipe interface 11 to connect to the water supply branch pipe 2 according to the actual pipe laying requirements of the degraded grassland on the same main water supply pipe 1, while other main pipe interfaces 11 that are not needed for the time being are closed by the threaded plug 12, so as to realize the on-demand configuration of the main water supply pipe 1.

[0023] Furthermore, several branch pipe interfaces 21 are provided on both sides of the water supply branch pipe 2, and the branch pipe interfaces 21 on both sides are staggered. The connecting end of the micro-lubricating pipe 3 is connected to a connecting seat 34, which is sealed and fitted onto the branch pipe interface 21. It should be noted that the connecting part between the connecting seat 34 and the branch pipe interface 21 can also be tied with binding wire, and the connecting surface between the connecting seat 34 and the branch pipe interface 21 can also be wrapped with sealing tape. The staggered arrangement of the branch pipe interfaces 21 causes each micro-lubricating pipe 3 to extend outward from both sides of the water supply branch pipe 2 in an alternating manner. The placement of adjacent micro-lubricating pipes 3 on both sides of the water supply branch pipe 2 is staggered, so that the micro-lubricating pipes... 3. The distribution in degraded grassland soil is more uniform and reasonable. The docking seat 34, as the intermediate connecting part between the micro-lubricating pipe 3 and the water supply branch pipe 2, has a sealed sleeve structure that makes the docking end of the micro-lubricating pipe 3 and the branch pipe interface 21 form a sealed fit, preventing irrigation water from leaking at the connection. The binding wire further enhances the connection between the docking seat 34 and the branch pipe interface 21, effectively preventing the docking seat 34 from loosening and slipping off the branch pipe interface 21 due to soil settlement or water pressure fluctuations. The sealing tape further improves the sealing performance of the connection, ensuring that the connection of the micro-lubricating pipe 3 does not leak under long-term buried use conditions.

[0024] like Figure 8 As shown, the micro-lubricating tube 3 includes a coaxially sleeved permeable protective sleeve 31 and a semi-permeable membrane tube 32. The semi-permeable membrane tube 32 is disposed inside the permeable protective sleeve 31, with an annular gap between the semi-permeable membrane tube 32 and the permeable protective sleeve 31. Several nanometer-scale micropores are formed on the wall of the semi-permeable membrane tube 32. A spiral support plate 33 is provided between the semi-permeable membrane tube 32 and the permeable protective sleeve 31. The spiral support plate 33 extends spirally along the length of the semi-permeable membrane tube 32, and its inner edge is aligned with the inner edge of the tube. The outer wall of the semi-permeable membrane hose 32 is fixedly connected, and the outer edge of the spiral support plate 33 abuts against the inner wall of the permeable protective sleeve 31. The spiral support plate 33 divides the annular gap between the semi-permeable membrane hose 32 and the permeable protective sleeve 31 into a spiral water flow channel. It should be noted that the semi-permeable membrane hose 32 is made of a polymer semi-permeable membrane material, and the permeable protective sleeve 31 is made of non-woven fabric or porous fiber braid. The permeable protective sleeve 31, as an outer protective structure, is in direct contact with the soil of the degraded grassland, separating soil particles and plant roots. The semi-permeable membrane hose 32, acting as the core water outlet structure, is located inside the permeable protective sleeve 31, acting as an outer layer barrier. The coaxial sleeve design creates a uniform annular gap between the outer wall of the semi-permeable membrane hose 32 and the inner wall of the permeable protective sleeve 31. This annular gap provides buffering and pressure equalization space for the water seeping from the semi-permeable membrane hose 32, preventing soil particles from directly contacting and clogging the micropores on the outer wall of the semi-permeable membrane hose 32. This enables a micro-volume, continuous underground irrigation method. The spiral support plate 33 maintains a stable annular gap between the semi-permeable membrane hose 32 and the permeable protective sleeve 31, preventing the permeable protective sleeve 31 from collapsing and adhering to the outer wall of the semi-permeable membrane hose 32 under external pressure, thus affecting water output. The semi-permeable membrane hose 32 is made of a high-polymer semi-permeable membrane material, which has good permeability and microbial adhesion stability. The permeable protective sleeve 31 is made of non-woven fabric or porous fiber braid, which has good permeability and soil isolation properties. The combined use of these two materials ensures normal outflow from the micro-irrigation tube 32 and extends its service life.

[0025] like Figure 2 , Figure 4 and Figure 6As shown, the pressure regulating pipe 4 is a three-way pipe structure, with its middle port facing vertically upwards. The lower end of the pressure regulating chamber housing 41 is fixedly connected to the middle port of the pressure regulating pipe 4. A valve core guide ring 48 is provided inside the pressure regulating chamber housing 41, and is fixedly connected to the joint between the pressure regulating chamber housing 41 and the pressure regulating pipe 4. The pressure regulating valve core 46 passes through the valve core guide ring 48 and slides within it. The lower end of the pressure regulating valve core 46 passes through the valve core guide ring 48 and extends into the pressure regulating pipe 4. A water passage gap is formed between the lower outer wall of the pressure regulating valve core 46 and the inner wall of the pressure regulating pipe 4. A limit hole 49 is provided in the lower section of the pressure regulating valve core 46. A limit rod 410 is fixedly connected to the bottom surface of the pressure regulating pipe 4, and the limit rod 410 movably passes through the limit hole 49. The limit rod 410 provides support to the pressure regulating valve core 46. The axial movement stroke of the pressure regulating valve core 46 is limited. The middle port of the pressure regulating pipe 4 is set vertically upward so that the pressure regulating valve core 46 can move up and down vertically under the combined action of gravity and the elastic force of the pressure regulating spring 45. This avoids the problem of valve core wear and jamming caused by the inclined arrangement. The valve core guide ring 48 provides guidance for the axial movement of the pressure regulating valve core 46. A water passage gap is formed between the lower outer wall of the pressure regulating valve core 46 and the inner wall of the pressure regulating pipe 4. This water passage gap provides a variable water flow channel for irrigation water to flow from the upstream to the downstream of the pressure regulating pipe 4. The axial movement of the pressure regulating valve core 46 changes the size of the water passage gap, thereby changing the local resistance. The cooperation between the limiting rod 410 and the limiting hole 49 limits the axial movement stroke of the pressure regulating valve core 46 to prevent the pressure regulating valve core 46 from shifting under water pressure fluctuations.

[0026] Furthermore, the pressure regulating chamber cover 42 is movably screwed onto the upper end of the opening of the pressure regulating chamber housing 41 via a threaded connection. A spring positioning boss 44 is integrally formed at the center of the lower surface of the pressure regulating chamber cover 42. A spring positioning groove 47 is formed at the top of the pressure regulating valve core 46. The upper end of the pressure regulating spring 45 is sleeved and abuts against the outer wall of the spring positioning boss 44, and the lower end of the pressure regulating spring 45 extends into the spring positioning groove 47 and abuts against the bottom surface of the spring positioning groove 47. The pressure regulating diaphragm 411 divides the inner cavity of the pressure regulating chamber housing 41 into upper and lower sections. The pressure regulating spring 45 is located in the upper chamber of the pressure regulating chamber and the lower chamber. The preload of the pressure regulating spring 45 is set to different values ​​depending on the installation position of the pressure regulating chamber housing 41 on the water supply branch pipe 2. The screw-in depth of the pressure regulating chamber cover 42 on the pressure regulating chamber housing 41 can be adjusted according to actual needs through a threaded connection. By rotating the pressure regulating chamber cover 42, its axial position on the pressure regulating chamber housing 41 is changed, thereby changing the preload of the pressure regulating spring 45. This allows for on-site adjustment of the preset pressure value of the pressure regulating pipe 4 at different installation positions. The spring positioning boss 44 and the spring positioning groove 47 provide bidirectional positioning for the pressure regulating spring 45 from the upper external end and the lower internal end, respectively, effectively preventing radial deviation or instability of the pressure regulating spring 45 during compression and rebound. The pressure regulating diaphragm 411 divides the inner cavity of the pressure regulating chamber housing 41 into an upper chamber and a lower chamber. This separation structure ensures that the pressure regulating spring 45 in the upper chamber and the downstream water pressure introduced into the lower chamber are independent and interact with each other. The upper chamber is sealed and isolated from the outside world through the pressure regulating chamber cover 42, preventing external impurities from entering. The ingress of the material into the upper chamber affects the normal operation of the pressure regulating spring 45. The preload of the pressure regulating spring 45 is set to different values ​​according to the installation position of the pressure regulating chamber housing 41 on the water supply branch pipe 2. The pressure regulating spring 45 in the pressure regulating pipe 4 at the front end of the water supply branch pipe 2 has a larger preload to cope with the higher inlet water pressure, while the pressure regulating spring 45 in the pressure regulating pipe 4 at the rear end of the water supply branch pipe 2 has a smaller preload to adapt to the lower end water pressure. The pressure regulating springs 45 with different preloads are each set with their own target stabilizing value, realizing graded stabilization along the flow path.

[0027] Furthermore, a connecting pipe 43 is also connected to the body of the pressure regulating pipe 4. One end of the connecting pipe 43 is connected to the interior of the pressure regulating pipe 4, and the other end of the connecting pipe 43 is connected to the lower chamber of the pressure regulating chamber housing 41. The connecting pipe 43 introduces the water pressure of the downstream section of the water supply branch pipe 2 into the lower chamber of the pressure regulating chamber housing 41 to act on the lower surface of the pressure regulating diaphragm 411. The lower end of the pressure regulating valve core 46 is conical or hemispherical. When the lower end of the pressure regulating valve core 46 moves downward, it gradually reduces the effective area of ​​the water passage gap in the pressure regulating pipe 4. The connecting pipe 43 introduces the water pressure of the outlet side of the pressure regulating pipe 4, i.e., the downstream section of the water supply branch pipe 2, into the lower chamber of the pressure regulating chamber housing 41, so that the water pressure in the lower chamber is truly reduced. The pressure is reflected in the actual working pressure of the downstream pipe section. This pressure acts on the lower surface of the pressure regulating diaphragm 411, forming a dynamic pressure balance with the downward elastic force of the pressure regulating spring 45 acting on the pressure regulating valve core 46. When the water pressure in the downstream pipe section decreases due to friction loss, the water pressure acting on the lower surface of the pressure regulating diaphragm 411 in the lower chamber decreases, and the elastic force of the pressure regulating spring 45 increases relatively, pushing the pressure regulating valve core 46 downward. When the water pressure in the downstream pipe section increases due to inlet pressure fluctuations, the water pressure acting on the lower surface of the pressure regulating diaphragm 411 in the lower chamber increases, overcoming the elastic force of the pressure regulating spring 45 and pushing the pressure regulating valve core 46 upward, thus realizing real-time response and automatic adjustment to changes in downstream water pressure.

[0028] like Figure 2 , Figure 7 and Figure 8As shown, the bottom support plate 51 extends along the length of the micro-lubricating pipe 3. Fixing straps 52 for securing the pipe body of the micro-lubricating pipe 3 are connected to both sides of the bottom support plate 51. A water collection groove 54 is formed on the inner side of the bottom support plate 51, fitting snugly against the lower half of the outer wall of the micro-lubricating pipe 3. The upper end of the ground insertion pipe 5 is fixedly connected to the lowest point of the bottom surface of the water collection groove 54. A pointed cone 53 is connected to the lower end of the ground insertion pipe 5. Several micro-holes are formed in the pipe body of the ground insertion pipe 5. Water seeping from the micro-lubricating pipe 3 collects in the water collection groove 54, then flows into the ground insertion pipe 5 through the upper end of the ground insertion pipe 5, and seeps out into the surrounding soil through the micro-holes in the pipe body. The bottom support plate 51 provides continuous full-length support for the entire micro-lubricating pipe 3, preventing local suspension or local pressure on the micro-lubricating pipe 3 along its length. The fixing straps 52 extend from the upper part of the micro-lubricating pipe 3... The pipe body of the micro-irrigation pipe 3 is tied and fixed to the bottom support plate 51 to prevent the micro-irrigation pipe 3 from detaching from the bottom support plate 51 during construction or soil settlement. The water seeping out from the lower half of the outer wall of the micro-irrigation pipe 3 can be directly received and collected by the wall of the water collection trough 54. The irrigation water collected in the water collection trough 54 can automatically flow to the upper end of the ground-inserted pipe 5 under the action of gravity, avoiding water accumulation in the water collection trough 54. The pointed cone 53 makes it easy for the ground-inserted pipe 5 to be inserted into hard or compacted degraded grassland soil during construction, reducing the difficulty of inserting the ground-inserted pipe 5. The irrigation water in the ground-inserted pipe 5 slowly seeps into the deep soil through micropores, guiding the irrigation water that the micro-irrigation pipe 3 could originally only moisten the shallow soil to the deep grass root distribution area, which not only ensures the moisture of the shallow soil but also achieves the replenishment of the deep soil, expanding the effective soil depth of the micro-irrigation pipe 3.

[0029] Working principle: The main water supply pipe 1 is laid on the surface of the area to be restored or shallowly buried underground along the length of the degraded grassland. The inlet end of the main water supply pipe 1 is connected to the water source. According to the terrain of the degraded grassland and the restoration needs, several main pipe interfaces 11 on both sides of the main water supply pipe 1 are selectively connected to the water supply branch pipes 2. Each water supply branch pipe 2 extends outward from both sides of the main water supply pipe 1 in a branch shape. After the irrigation water enters the main water supply pipe 1 from the water source, it is diverted into each water supply branch pipe 2 through the main pipe interfaces 11. As the irrigation water flows forward along the water supply branch pipe 2, the pressure regulating pipe 4 connected to the body of the water supply branch pipe 2 adjusts the water pressure along the water supply branch pipe 2 in stages. The water pressure at the outlet of the pressure regulating pipe 4, i.e., the downstream section of the water supply branch pipe 2, is introduced into the lower chamber of the pressure regulating chamber housing 41 via the guide pipe 43 and acts on the lower surface of the pressure regulating diaphragm 411. This water pressure is dynamically balanced with the downward elastic force exerted on the pressure regulating valve core 46 by the pressure regulating spring 45 between the pressure regulating chamber cover 42 and the pressure regulating valve core 46. When the water pressure in the downstream section of the water supply branch pipe 2 decreases due to the increased travel distance, the water pressure acting on the lower surface of the pressure regulating diaphragm 411 in the lower chamber decreases, the elastic force of the pressure regulating spring 45 relatively increases, and pushes the pressure regulating valve core 46 downward along the valve core guide ring 48. The lower end extends further into the pressure regulating pipe 4. The effective area of ​​the water passage gap between the lower outer wall of the pressure regulating valve core 46 and the inner wall of the pressure regulating pipe 4 decreases, and the local resistance increases, thereby increasing the water pressure in the downstream pipe section to achieve automatic pressure stabilization compensation. When the water pressure in the downstream pipe section of the water supply branch pipe 2 increases due to inlet pressure fluctuations, the water pressure acting on the lower surface of the pressure regulating diaphragm 411 in the lower chamber increases and overcomes the elastic force of the pressure regulating spring 45 to push the pressure regulating valve core 46 upward. The lower end of the pressure regulating valve core 46 retracts from the pressure regulating pipe 4, the effective area of ​​the water passage gap increases, and the local resistance decreases, thereby reducing the water pressure in the downstream pipe section. After pressure regulation and stabilization, the irrigation water enters each micro-lubricating tube 3 through the branch pipe interface 21 on both sides of the water supply branch pipe 2 and the docking seat 34. After the irrigation water enters the semi-permeable membrane hose 32 of the micro-lubricating tube 3, driven by the water potential gradient difference inside and outside the semi-permeable membrane hose 32, the water molecules slowly seep out through the micropores on the wall of the semi-permeable membrane hose 32 into the annular gap between the semi-permeable membrane hose 32 and the water-permeable protective sleeve 31, and then seep out of the outside of the micro-lubricating tube 3 through the water-permeable protective sleeve 31. The irrigation water seeping from the micro-lubricating pipe 3 is collected along the arc-shaped inner wall of the water collection groove 54 of the bottom support plate 51 under the action of gravity, and then flows into the ground insertion pipe 5 through the upper end of the pipe. The pointed cone 53 connected to the lower end of the ground insertion pipe 5 inserts the pipe into the deep soil. The irrigation water in the ground insertion pipe 5 continuously washes and wets the soil conditioner capsule 55 placed in the pipe, so that the conditioner components in the soil conditioner capsule 55 are released into the deep soil along with the irrigation water through the micropores on the pipe body. This achieves the three-in-one synergistic effect of the micro-lubricating pipe 3 continuously supplying water to moisten the surface grass root soil, the ground insertion pipe 5 conducting deep water to supplement irrigation, and delivering the conditioner to the deep grass root distribution area.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multifunctional micro-irrigation pipe assembly for degraded grassland restoration, comprising a main water supply pipe (1), a branch water supply pipe (2), and a micro-irrigation pipe (3) connected in sequence, characterized in that: The water supply branch pipe (2) is connected to both sides of the main water supply pipe (1), and the micro-lubricating pipe (3) is connected to both sides of the water supply branch pipe (2). The water supply branch pipe (2) is connected to a pressure regulating pipe (4) at three equal sections. A pressure regulating chamber shell (41) is connected to the body of the pressure regulating pipe (4). A connecting pipe (43) is also connected to the body of the pressure regulating pipe (4). One end of the connecting pipe (43) is connected to the inside of the pressure regulating pipe (4), and the other end of the connecting pipe (43) is connected to the lower chamber of the pressure regulating chamber shell (41). The connecting pipe (43) introduces the water pressure of the downstream section of the water supply branch pipe (2) into the lower chamber of the pressure regulating chamber shell (41) to act on the lower surface of the pressure regulating diaphragm (411). The pressure regulating chamber shell (41) is movably arranged with A pressure regulating valve core (46) is provided, and the lower end of the pressure regulating valve core (46) is movably inserted into the pressure regulating pipe (4). A pressure regulating diaphragm (411) is connected between the pressure regulating valve core (46) and the pressure regulating chamber housing (41). A pressure regulating chamber cover (42) is movably connected to the upper end of the opening of the pressure regulating chamber housing (41). A pressure regulating spring (45) is provided between the pressure regulating chamber cover (42) and the pressure regulating valve core (46). When the downstream water pressure increases, the pressure regulating valve core (46) moves upward against the elastic force of the pressure regulating spring (45). When the downstream water pressure decreases, the pressure regulating valve core (46) moves downward by the elastic force of the pressure regulating spring (45). The micro-lubricating tube (3) has an arc-shaped bottom support plate (51) at the bottom of its tube body. The bottom middle part of the bottom support plate (51) is connected to the ground insertion tube (5). The ground insertion tube (5) has several micro holes in its tube body, and a soil conditioner capsule (55) is placed inside the ground insertion tube (5).

2. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 1, characterized in that: The main water supply pipe (1) has several main pipe interfaces (11) on both sides of its body, and the main pipe interfaces (11) on both sides are staggered. One end of the water supply branch pipe (2) is threaded into the main pipe interface (11). The main pipe interface (11) that is not connected to the water supply branch pipe (2) is fitted with a threaded plug (12), and the threaded plug (12) seals the main pipe interface (11) by threading.

3. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 1, characterized in that: The water supply branch pipe (2) has several branch pipe interfaces (21) on both sides of the pipe body, and the branch pipe interfaces (21) on both sides are staggered. The docking end of the micro-lubricating pipe (3) is connected to a docking seat (34), and the docking seat (34) is sealed on the branch pipe interface (21).

4. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 1, characterized in that: The micro-lubricating tube (3) includes a coaxially sleeved permeable protective sleeve (31) and a semi-permeable membrane tube (32). The semi-permeable membrane tube (32) is disposed inside the permeable protective sleeve (31). An annular gap is left between the semi-permeable membrane tube (32) and the permeable protective sleeve (31). Several nano-scale micropores are opened on the tube wall of the semi-permeable membrane tube (32). A spiral support plate (33) is provided between the semi-permeable membrane tube (32) and the permeable protective sleeve (31). The spiral support plate (33) extends spirally along the length direction of the semi-permeable membrane tube (32). The inner edge of the spiral support plate (33) is fixedly connected to the outer wall of the semi-permeable membrane tube (32). The outer edge of the spiral support plate (33) abuts against the inner wall of the permeable protective sleeve (31). The spiral support plate (33) divides the annular gap between the semi-permeable membrane tube (32) and the permeable protective sleeve (31) into a spiral water flow channel.

5. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 1, characterized in that: The pressure regulating pipe (4) is a three-way pipe structure, with the middle port of the pressure regulating pipe (4) facing vertically upwards. The lower end of the pressure regulating chamber housing (41) is fixedly connected to the middle port of the pressure regulating pipe (4). The pressure regulating chamber housing (41) is provided with a valve core guide ring (48). The valve core guide ring (48) is fixedly connected to the docking part between the pressure regulating chamber housing (41) and the pressure regulating pipe (4). The pressure regulating valve core (46) passes through the valve core guide ring (48) and slides in cooperation with the valve core guide ring (48). The lower end of the pressure regulating valve core (46) passes through the valve core guide ring (48) and extends into the pressure regulating pipe (4). A water passage gap is formed between the lower outer wall of the pressure regulating valve core (46) and the inner wall of the pressure regulating pipe (4). A limit hole (49) is opened in the lower section of the pressure regulating valve core (46). A limit rod (410) is fixedly connected to the bottom surface of the pressure regulating pipe (4). The limit rod (410) is movably inserted into the limit hole (49). The limit rod (410) limits the axial movement stroke of the pressure regulating valve core (46).

6. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 5, characterized in that: The pressure regulating chamber cover (42) is movably screwed onto the upper end of the opening of the pressure regulating chamber housing (41) by means of a threaded connection. A spring positioning boss (44) is integrally formed at the center of the lower surface of the pressure regulating chamber cover (42). A spring positioning groove (47) is provided at the top of the pressure regulating valve core (46). The upper end of the pressure regulating spring (45) is sleeved and abuts against the outer wall of the spring positioning boss (44). The lower end of the pressure regulating spring (45) extends into the spring positioning groove (47) and abuts against the bottom surface of the spring positioning groove (47). The pressure regulating diaphragm (411) divides the inner cavity of the pressure regulating chamber housing (41) into an upper chamber and a lower chamber. The pressure regulating spring (45) is set in the upper chamber. The preload of the pressure regulating spring (45) is set to different values ​​according to the installation position of the pressure regulating chamber housing (41) on the water supply branch pipe (2).

7. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 6, characterized in that: The lower end of the pressure regulating valve core (46) is conical or hemispherical, and the effective area of ​​the water passage gap in the pressure regulating pipe (4) gradually decreases as the lower end of the pressure regulating valve core (46) moves downward.

8. The multifunctional micro-irrigation pipe assembly for degraded grassland restoration according to claim 1, characterized in that: The bottom support plate (51) extends along the length of the micro-lubricating tube (3). The two sides of the bottom support plate (51) are connected with fixing straps (52) for fixing the tube body of the micro-lubricating tube (3). The inner side of the bottom support plate (51) is provided with a water collection groove (54). The water collection groove (54) is in contact with the outer wall of the lower half of the micro-lubricating tube (3). The upper end of the ground insertion tube (5) is fixedly connected to the lowest point of the bottom surface of the water collection groove (54). The lower end of the ground insertion tube (5) is connected with a pointed cone (53). The tube body of the ground insertion tube (5) is provided with several micro holes. The water seeping out of the micro-lubricating tube (3) is collected in the water collection groove (54), and then flows into the ground insertion tube (5) through the port at the upper end of the ground insertion tube (5), and seeps out into the soil around the ground insertion tube (5) through the micro holes on the tube body of the ground insertion tube (5).

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