Farmland irrigation water supply control device and method

Abstract

The invention relates to a farmland irrigation water supply control device and method. An underground irrigation cavity is internally provided with a branch drainage pipe communicated with a branch output pipeline, the bottom of the branch drainage pipe is provided with a lower drainage port with a first electromagnetic valve, the side wall of the underground irrigation cavity is provided with a drainage hole, and the top of the branch drainage pipe is provided with an upper drainage port; a drainage channel is arranged above the transverse baffle, a longitudinal drainage pipe communicated with the upper drainage opening is installed in the drainage channel, a four-way electromagnetic valve is installed on the upper portion of the longitudinal drainage pipe, a transverse drainage pipe is installed in the transverse direction of the four-way electromagnetic valve, and a spray head is arranged on the transverse drainage pipe. The top of the four-way electromagnetic valve is provided with a scattered top nozzle through a square nozzle connecting pipeline; components are adjusted according to requirements, water supply irrigation at different heights of the longitudinal face can be achieved, meanwhile, surplus water can be discharged and collected, usability is high, irrigation types are diversified, and water supply control is accurate.

Description

Technical Field

[0001] This invention relates to the field of automation control technology, specifically to a farmland irrigation water supply control device and method. Background Technology

[0002] With increasing demands for water conservation, farmland irrigation water supply control is evolving towards intelligent control, supplying irrigation water according to the farmland's water needs. Traditional control systems typically use sensors located in the field to collect temperature, humidity, and soil moisture data, then a controller activates corresponding irrigation modes such as sprinkler irrigation and underground irrigation. Water supply control is achieved by quantitatively supplying water based on the actual water requirements of the farmland. This traditional method has several drawbacks: First, it can only employ a single irrigation method, failing to provide comprehensive, multi-functional irrigation based on crop growth height and the water requirements of roots, stems, and leaves. Second, to achieve multi-directional, multi-demand irrigation, traditional water supply control systems require complex irrigation pipelines, resulting in complex and costly control systems with limited irrigation coverage, leading to complex pipeline construction and resource waste. Third, traditional irrigation systems lack corresponding drainage systems, causing waterlogging during periods of abundant rainfall, which severely impacts crop growth.

[0003] Therefore, how to rationally and scientifically control water-saving irrigation using integrated irrigation devices based on crop growth needs, irrigation location requirements, and farmland water demand has become an urgent problem to be solved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a farmland irrigation water supply control device and method that is simple in structure, easy to operate, highly integrated with terminal irrigation, meets the needs of different crop growth stages and different irrigation modes, provides precise water-saving control, fully conserves water resources, and is simple and easy to operate, thereby overcoming the deficiencies in existing technologies.

[0005] The technical solution of this invention is implemented as follows: A farmland irrigation water supply control device includes an irrigation main pipeline equipped with a variable frequency water pump. The irrigation main pipeline is connected to several branch output pipelines, which are connected to an integrated water supply and drainage ditch. A transverse baffle is provided in the integrated water supply and drainage ditch, and an underground irrigation chamber is provided below the transverse baffle. A branch drainage pipe connected to the branch output pipeline is installed in the underground irrigation chamber. A lower drainage port with a first solenoid valve is provided at the bottom of the branch drainage pipe. A drainage hole is provided on the side wall of the underground irrigation chamber. An upper drainage port is provided at the top of the branch drainage pipe. A drainage ditch is provided above the transverse baffle, and a longitudinal drainage pipe connected to the upper drainage port is installed in the drainage ditch. A four-way solenoid valve is installed at the top of the longitudinal drainage pipe. A transverse drainage pipe is installed transversely to the four-way solenoid valve. A nozzle is provided on the transverse drainage pipe. A diffused top nozzle is installed on the top of the four-way solenoid valve through a square nozzle connecting pipe.

[0006] One end of the integrated water supply and drainage channel is equipped with a baffle, and a branch output pipe is installed on the baffle. The other end of the integrated water supply and drainage channel is equipped with a snap-fit ​​plate with a slot that matches the inner wall of the drainage channel. A water inlet pipe is installed in the slot and is connected to a water collection tank. A filter chamber is installed in the water collection tank, and a water pump is installed in the filter chamber. The water pump is connected to the filter through a circulating water pipe equipped with a second solenoid valve. The input end of the filter is connected to the water source through a third solenoid valve, and the output end of the filter is connected to the main irrigation pipeline.

[0007] The integrated water supply and drainage channel is a square-section silo structure. The horizontal baffle is pre-buried underground, and the branch drainage pipe is installed on the bottom wall of the integrated water supply and drainage channel by a support column. The underground irrigation chamber inside the drainage hole is equipped with an anti-blocking and seepage isolation plate.

[0008] A drainage gap is provided between the lower drainage outlet and the bottom wall of the integrated water supply and drainage channel. The branch drainage pipe is a square pipe. The transverse baffle is located in the upper part of the longitudinal direction of the integrated water supply and drainage channel. The top of the upper drainage outlet is connected to the bottom of the transverse baffle.

[0009] The transverse baffle has a longitudinal drain pipe mounting hole that communicates with the top of the upper drain outlet, and the bottom of the longitudinal drain pipe is inserted into the longitudinal drain pipe mounting hole.

[0010] The drainage ditch is equipped with several longitudinal drainage pipes that are equidistant from each other, and transverse drainage pipes are installed between two adjacent longitudinal drainage pipes. Sprinklers are located on one or both sides of the transverse drainage pipes.

[0011] The diffused top nozzle is installed on the top of the nozzle connecting pipe by plugging it in. The diameter of the nozzle connecting pipe is no greater than the diameter of the longitudinal drain pipe.

[0012] The horizontal drain pipe is horizontally installed between two connected four-way solenoid valves. The four passages of the four-way solenoid valves are located at the top, bottom, left, and right sides, respectively. The horizontal drain pipe is installed between the left and right passages of the two connected four-way solenoid valves.

[0013] A water supply control method for the farmland irrigation water supply control device as described above, the method being as follows: When the farmland detects irrigation needs via temperature and humidity sensors or soil moisture sensors, the variable frequency water pump is activated. Irrigation water flows through the main irrigation pipe into the branch output pipe, and then to the branch drainage pipe. Depending on the irrigation method, subsurface irrigation, foliar sprinkler irrigation, or top-sprinkler irrigation is implemented. When subsurface irrigation is selected, the bottom passage of the four-way solenoid valve is closed, and the first solenoid valve is opened. Water from the branch drainage pipe enters the subsurface irrigation chamber through the lower drain outlet, and then flows through the drain hole to the bottom soil for irrigation. When foliar sprinkler irrigation is selected, the first solenoid valve is closed, the bottom passage and either the left or right side of the four-way solenoid valve are opened, and the top passage is closed. Water flows through the branch drainage pipe into the longitudinal drainage pipe, then into the transverse drainage pipe, and finally exits through the sprinkler head. When top-sprinkler irrigation is selected, the bottom and top passages of the four-way solenoid valve are opened, the left and right passages are closed, and the first solenoid valve is closed. Water flows through the branch drainage pipe into the longitudinal drainage pipe and the sprinkler head connection pipe, and finally exits through the top sprinkler head. When there is surplus water in the farmland, the surplus water is collected into the collection pool through drainage ditches and water pipes. When supplementary irrigation is needed, the water filtered through the filter chamber is pumped out by the pump, the second solenoid valve is opened and the third solenoid valve is closed. The water in the collection pool is transported to the filter through the circulating water pipe, and after filtration, it is transported to the main irrigation pipeline. The variable frequency water pump is then turned on to carry out supplementary irrigation.

[0014] The present invention has the following positive effects: 1. This invention achieves control over irrigation and drainage operations by pre-burying an integrated water supply and drainage canal in farmland. The integrated water supply and drainage canal is divided into a lower irrigation area and an upper drainage area by horizontal baffles. Longitudinal drainage pipes are installed in the upper drainage area to implement longitudinal irrigation from the middle and top spray irrigation. Depending on the height of the crops, different heights of longitudinal drainage pipes and sprinkler connection pipes can be installed, enabling different underground irrigation, foliar sprinkler irrigation, and top spray irrigation operations at different growth stages of the crops. This not only achieves precise control of crop irrigation but also integrates the system, making it suitable for crops of different heights. It is reusable, and components can be adjusted as needed. It can effectively achieve irrigation at different heights in the longitudinal plane, while also draining and collecting excess water. It is highly usable, offers diverse irrigation types, and provides precise water supply control.

[0015] 2. This invention sets up a water collection tank to collect and utilize surplus water in a circular manner. The circular water collection operation is realized through an integrated water conveyance and drainage channel, which saves water resources. The baffle and the snap-fit ​​plate are located at different ends of the integrated water conveyance and drainage channel, which realizes the diversion and output of surplus water source. The irrigation water source is purified through secondary filtration, ensuring the smooth flow of pipelines and water outlets and reducing maintenance.

[0016] 3. The integrated water supply and drainage channel below the transverse baffle of this invention adopts a pre-buried operation method. The installation of the support column realizes the overall connectivity of the underground irrigation cavity. The anti-seepage isolation plate ensures the smooth flow of the pipeline and the water outlet, reducing maintenance.

[0017] 4. The design of the longitudinal drainage pipe installation hole in this invention enhances the convenience and reusability of the product. Different pipes can be installed on the upper part of the longitudinal drainage pipe installation hole according to actual needs, and the installation method is flexible. The longitudinal drainage pipe and the nozzle connection pipe are all installed by plugging, which is convenient for disassembly and assembly and convenient for reuse.

[0018] 5. This invention uses drainage holes, nozzles, and scattered top nozzles to achieve water supply control for different heights and irrigation needs. The arrangement of solenoid valves enables individual drainage hole irrigation, individual nozzle spraying irrigation, or individual scattered top spraying irrigation. These three methods can be combined as needed, providing flexible irrigation methods, precise water supply control, and efficient water-saving control. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the integrated water supply and drainage ditch structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the internal structure of the integrated water supply and drainage channel of the present invention.

[0022] Figure 4 This is one of the partial top view structural schematic diagrams of the present invention.

[0023] Figure 5 This is a partial bottom view of the structure of the present invention.

[0024] Figure 6 This is a second partial top view of the structure of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the following description of the invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" simply indicates a connection between devices and has no special meaning.

[0027] like Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, a farmland irrigation water supply control device includes an irrigation main pipeline 12 equipped with a variable frequency water pump 13. The irrigation main pipeline 12 is connected to several branch output pipelines 14, which are connected to an integrated water supply and drainage channel 1. A transverse baffle 22 is installed inside the integrated water supply and drainage channel 1, and an underground irrigation chamber 24 is installed below the transverse baffle 22. A branch drainage pipe 26 connected to the branch output pipelines 14 is installed inside the underground irrigation chamber 24. The bottom of the branch drainage pipe 26 is equipped with a lower part with a first solenoid valve 30. Drainage outlet 29, drainage hole 15 is provided on the side wall of underground irrigation chamber 24, upper drainage outlet 27 is provided at the top of branch drainage pipe 26, drainage channel 23 is provided above transverse baffle 22, longitudinal drainage pipe 16 connected to upper drainage outlet 27 is installed in drainage channel 23, four-way solenoid valve 17 is installed at the top of longitudinal drainage pipe 16, transverse drainage pipe 20 is installed transversely to four-way solenoid valve 17, nozzle 21 is provided on transverse drainage pipe 20, and diffused top nozzle 19 is installed at the top of four-way solenoid valve 17 through square nozzle connecting pipe 18. One end of the integrated water supply and drainage channel 1 is equipped with a baffle 2, and a branch output pipe 14 is installed on the baffle 2. The other end of the integrated water supply and drainage channel 1 is equipped with a snap-fit ​​plate 3. The snap-fit ​​plate 3 is equipped with a slot that matches the inner wall of the drainage channel 23. A water inlet pipe 4 is installed in the slot. The water inlet pipe 4 is connected to the water collection tank 5. A filter chamber 6 is installed in the water collection tank 5. A water pump 7 is installed in the filter chamber 6. The water pump 7 is connected to the filter 10 through a circulating water pipe 9 equipped with a second solenoid valve 8. The input end of the filter 10 is connected to the water source end through a third solenoid valve 11. The output end of the filter 10 is connected to the main irrigation pipe 12.

[0028] In actual operation, based on the farmland surface layer, the integrated drainage canal 1 is first pre-buried. During the pre-burying operation, the integrated drainage canal 1 under the transverse baffle 22 is pre-buried through trenching to ensure that the upper part of the transverse baffle 22 is located above the soil surface layer, facilitating the drainage of excess water later. Several branch output pipes 14 are installed on the baffle 2 on one side of the integrated drainage canal 1. The outer end of the branch output pipe 14 is connected to the main irrigation pipe 12, and the inner end of the branch output pipe 14 is connected to the branch drainage pipe. The water source in the main irrigation pipe 12 is introduced into the branch drainage pipe 26 by the variable frequency water pump 13 for further diversion irrigation.

[0029] In actual operation, the transverse baffle 22 is fixedly installed, dividing the integrated drainage channel 1 longitudinally into upper and lower layers. The upper layer is a drainage channel 23 for draining excess water, formed by the top of the transverse baffle 22 and the inner wall of the integrated drainage channel 1. The lower layer is an underground irrigation chamber 24, formed by the bottom of the transverse baffle 22 and the inner wall of the integrated drainage channel 1. The branch drainage pipe 26 is the main water supply pipe for implementing diversion control in this invention. A lower drainage outlet 29 is installed at its lower part to transport water to the underground irrigation chamber 24. When the first solenoid valve 30 is opened, the water in the branch drainage pipe 26 is output through the lower drainage outlet 29. Under the output action of the drainage hole 15, it permeates to the surface layer of the soil below, implementing underground irrigation. During irrigation, the underground irrigation chamber 24 is filled with water, and the water is output from the drainage hole 15 by pressure permeation. Meanwhile, this product also provides an upper drain outlet 27 for connecting to the longitudinal drain pipe 16. The longitudinal drain pipe 16 is installed above the transverse baffle 22 on the upper part of the branch drain pipe 26 by means of plug-in installation or threaded connection. Its diameter setting does not affect the drainage operation of the drainage ditch 23. A four-way solenoid valve 17 is installed above the longitudinal drain pipe 16 by means of plug-in or threaded connection. The top output end of the four-way solenoid valve 17 is connected to the nozzle connection pipe 18 by means of plug-in or threaded connection. The top output end of the nozzle connection pipe 18 is connected to the diffused top sprinkler 19 by means of plug-in or threaded connection. An irrigation end that matches the crop height is formed in the longitudinal position. At the same time, in order to reduce the pipeline layout, a transverse drain pipe 20 is installed in the transverse direction of the four-way solenoid valve 17. The transverse drain pipe 20 can make up for the small number of longitudinal pipes in the transverse operation direction. When using it, the height of the crop after maturity should be considered. It is preferable that its installation height matches half the height of the crop after maturity.

[0030] In actual operation, the horizontal drainage pipe 20 is responsible for foliar sprinkler irrigation, while the scattered top sprinklers are aligned with and higher than the crop's mature height. The scattered top sprinklers 19 provide top-spray irrigation beyond the crop's top surface, compensating for the limited number of longitudinal pipes and enabling top-spray irrigation of a circular, diffused surface. Meanwhile, the horizontal drainage pipe 20 provides sprinkler irrigation towards the middle foliage of the crops on either side. This allows different irrigation methods to meet different irrigation needs.

[0031] The integrated drainage channel 1 is a square-section chamber structure. The transverse baffle 22 is pre-buried underground. The branch drainage pipe 26 is installed on the bottom wall of the integrated drainage channel 1 via a support column 28. An anti-clogging and seepage isolation plate 25 is installed in the underground irrigation chamber 24 inside the drainage hole 15. A drainage gap is provided between the lower drainage outlet 29 and the bottom wall of the integrated drainage channel 1. The branch drainage pipe 26 is a square pipe. The transverse baffle 22 is located in the upper-middle longitudinal position of the integrated drainage channel 1. The top of the upper drainage outlet 27 is connected to the bottom of the transverse baffle 22.

[0032] In actual operation, the integrated water supply and drainage channel 1 adopts a square chamber structure, which facilitates pre-laying and drainage operations. The installation of the support column 28 can isolate the bottom of the branch drainage pipe 26 from the bottom wall of the inner cavity of the integrated water supply and drainage channel 1, facilitating the installation of the lower drainage outlet 29. The number of lower drainage outlets 29 can be set according to the specific length of the integrated water supply and drainage channel 1. When the underground irrigation chamber 24 is used for infiltration irrigation through the drainage hole 15, in order to prevent soil and other impurities from entering the underground irrigation chamber 24, this product is equipped with an anti-clogging and seepage isolation plate 25 inside the drainage hole 15. This not only enables water infiltration irrigation but also prevents impurities from entering the underground irrigation chamber 24.

[0033] A longitudinal drain pipe mounting hole 31 is provided on the transverse baffle 22, which communicates with the top of the upper drain outlet 27. The bottom of the longitudinal drain pipe 16 is inserted into the longitudinal drain pipe mounting hole 31. Several longitudinal drain pipes 16 are installed in the drainage channel 23 at equal intervals. A transverse drain pipe 20 is installed between two adjacent longitudinal drain pipes 16. The nozzle 21 is located on one or both sides of the transverse drain pipe 20. A diffused top nozzle 19 is installed on the top of the nozzle connecting pipe 18 by plugging it in. The diameter of the nozzle connecting pipe 18 is not greater than the diameter of the longitudinal drain pipe 16. The transverse drain pipe 20 is horizontally arranged between two connected four-way solenoid valves 17. The four passages of the four-way solenoid valves 17 are located at the top, bottom, left, and right sides, respectively. The transverse drain pipe 20 is installed between the left and right passages of the two connected four-way solenoid valves 17.

[0034] The longitudinal drainage pipe mounting hole 31 facilitates the flexible installation of the longitudinal drainage pipe 16. This invention adopts a flexible installation and disassembly method, realizing the reusability of components and the installation of pipelines to meet the irrigation needs of different crops at different longitudinal heights. The transverse drainage pipe 20 is installed in the transverse length direction, which can make up for the insufficient number of longitudinal drainage pipes 16. A small number of longitudinal drainage pipes 16 can meet the irrigation needs of the central irrigation passage. When this invention is used for irrigation operations, the radiation length of the central irrigation is the same as the buried irrigation length at the bottom.

[0035] In implementing specific water supply control operations, this invention relies on the opening and closing of the variable frequency water pump 13, the opening and closing of the first solenoid valve 30, and the opening and closing of different passages of the four-way solenoid valve 17 to achieve the switching of different irrigation modes. Among them, the selective opening and closing of the four passages of the four-way solenoid valve 17 located in the middle is the key to the irrigation mode switching process.

[0036] When using a farmland irrigation water supply control device to implement water supply control irrigation operations: When the farmland end detects water demand information through temperature and humidity sensors or soil moisture sensors, the variable frequency water pump 13 is started. The irrigation water source enters the branch output pipe 14 through the main irrigation pipe 12, and then is transported to the branch drainage pipe 26. According to the irrigation method requirements, underground irrigation, foliar sprinkler irrigation, and top sprinkler irrigation operations are implemented. When underground irrigation is selected, the bottom passage of the four-way solenoid valve 17 is closed, the first solenoid valve 30 is opened, and the water source in the branch drainage pipe 26 enters the underground irrigation chamber 24 through the lower drainage port 29, and then is transported to the bottom soil through the drainage hole 15. Irrigation is carried out; when foliar sprinkler irrigation is selected, the first solenoid valve 30 is closed, the bottom passage and the left or right passage of the four-way solenoid valve 17 are opened, the top passage of the four-way solenoid valve 17 is closed, and the water source enters the longitudinal drain pipe 16 through the branch drain pipe 26, then enters the transverse drain pipe 20, and finally exits through the sprinkler head 21; when top sprinkler irrigation is selected, the bottom and top passages of the four-way solenoid valve 17 are opened, the left and right passages of the four-way solenoid valve 17 are closed, and the first solenoid valve 30 is closed. The water source enters the longitudinal drain pipe 16 and the sprinkler head connecting pipe 18 through the branch drain pipe 26, and finally exits through the top sprinkler head 19.

[0037] When there is surplus water in the farmland, the surplus water is collected into the collection pool 5 through the drainage ditch 23 and the water pipe 4. When it is necessary to carry out supplementary irrigation, the water filtered through the filter chamber 6 is pumped out by the water pump 7, the second solenoid valve 8 is opened and the third solenoid valve 11 is closed. The water in the collection pool 5 is transported to the filter 10 through the circulating water pipe 9, and after filtration, it is transported to the main irrigation pipe 12. The variable frequency water pump 13 is turned on to carry out supplementary irrigation.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A farmland irrigation water supply control device, comprising an irrigation main pipeline (12) equipped with a variable frequency water pump (13), characterized in that: The main irrigation pipe (12) is connected to several branch output pipes (14), and the branch output pipes (14) are connected to the integrated water supply and drainage channel (1). A transverse baffle (22) is installed in the integrated water supply and drainage channel (1), and an underground irrigation chamber (24) is installed below the transverse baffle (22). A branch drainage pipe (26) connected to the branch output pipe (14) is installed in the underground irrigation chamber (24). A lower drainage port (29) with a first solenoid valve (30) is provided at the bottom of the branch drainage pipe (26). Drainage holes (15) are opened on the side wall of the underground irrigation chamber (24). The branch drain pipe (26) is provided with an upper drain outlet (27) at the top. A drainage channel (23) is provided above the transverse baffle (22). A longitudinal drain pipe (16) connected to the upper drain outlet (27) is installed in the drainage channel (23). A four-way solenoid valve (17) is installed at the top of the longitudinal drain pipe (16). A transverse drain pipe (20) is installed on the transverse side of the four-way solenoid valve (17). A nozzle (21) is provided on the transverse drain pipe (20). A diffused top nozzle (19) is installed on the top of the four-way solenoid valve (17) through a square nozzle connecting pipe (18).

2. The farmland irrigation water supply control device according to claim 1, characterized in that: One end of the integrated water supply and drainage channel (1) is provided with a baffle (2), and a branch output pipe (14) is installed on the baffle (2). The other end of the integrated water supply and drainage channel (1) is provided with a snap-fit ​​plate (3). The snap-fit ​​plate (3) is provided with a slot that matches the inner wall of the drainage channel (23). A water inlet pipe (4) is installed in the slot. The water inlet pipe (4) is connected to the water collection tank (5). A filter chamber (6) is provided in the water collection tank (5). A water pump (7) is installed in the filter chamber (6). The water pump (7) is connected to the filter (10) through a circulating water pipe (9) with a second solenoid valve (8). The input end of the filter (10) is connected to the water source end through a third solenoid valve (11). The output end of the filter (10) is connected to the irrigation main pipe (12).

3. The farmland irrigation water supply control device according to claim 1, characterized in that: The integrated water supply and drainage channel (1) is a square-section silo structure. The horizontal baffle (22) is buried underground. The branch drainage pipe (26) is installed on the bottom wall of the integrated water supply and drainage channel (1) through the support column (28). The underground irrigation chamber (24) inside the drainage hole (15) is equipped with a water-blocking isolation plate (25).

4. The farmland irrigation water supply control device according to claim 1, characterized in that: A drainage gap is provided between the lower drainage outlet (29) and the bottom wall of the integrated water supply and drainage channel (1). The branch drainage pipe (26) is a square pipe. The transverse baffle (22) is located in the upper part of the longitudinal direction of the integrated water supply and drainage channel (1). The top of the upper drainage outlet (27) is connected to the bottom of the transverse baffle (22).

5. The farmland irrigation water supply control device according to claim 1, characterized in that: The transverse baffle (22) has a longitudinal drain pipe mounting hole (31) that is connected to the top of the upper drain outlet (27), and the bottom of the longitudinal drain pipe (16) is inserted into the longitudinal drain pipe mounting hole (31).

6. The farmland irrigation water supply control device according to claim 1, characterized in that: The drainage ditch (23) is equipped with several longitudinal drainage pipes (16) arranged at equal intervals. The transverse drainage pipe (20) is installed between two adjacent longitudinal drainage pipes (16). The nozzle (21) is set on one or both sides of the transverse drainage pipe (20).

7. The farmland irrigation water supply control device according to claim 1, characterized in that: The diffused top nozzle (19) is installed on the top of the nozzle connecting pipe (18) by plugging in, and the diameter of the nozzle connecting pipe (18) is not greater than the diameter of the longitudinal drain pipe (16).

8. The farmland irrigation water supply control device according to claim 6, characterized in that: The horizontal drain pipe (20) is horizontally arranged between two connected four-way solenoid valves (17). The four passages of the four-way solenoid valves (17) are located at the top, bottom, left and right sides respectively. The horizontal drain pipe (20) is installed between the left and right passages of the two connected four-way solenoid valves (17).

9. A water supply control method for a farmland irrigation water supply control device as described in claim 2, characterized in that, The method is as follows: When the farmland detects the need for irrigation through temperature and humidity sensors or soil moisture sensors, the variable frequency water pump (13) is started. The irrigation water source enters the branch output pipe (14) through the main irrigation pipe (12), and then is transported to the branch drainage pipe (26). According to the irrigation method requirements, underground irrigation, foliar irrigation, and top-sprinkler irrigation operations are carried out. When underground irrigation is selected, the bottom passage of the four-way solenoid valve (17) is closed, and the first solenoid valve (30) is opened. The water source in the branch drainage pipe (26) enters the underground irrigation chamber (24) through the lower drainage port (29), and then is transported to the bottom soil for irrigation through the drainage hole (15). When foliar irrigation is selected, When the first solenoid valve (30) is closed, the bottom passage and the left or right side passage of the four-way solenoid valve (17) are opened, the top passage of the four-way solenoid valve (17) is closed, and the water source enters the longitudinal drainage pipe (16) through the branch drainage pipe (26), then enters the transverse drainage pipe (20), and finally outputs through the nozzle (21); when the top spraying operation is selected, the bottom and top passages of the four-way solenoid valve (17) are opened, the left and right passages of the four-way solenoid valve (17) are closed, and the first solenoid valve (30) is closed. The water source enters the longitudinal drainage pipe (16) and the nozzle connecting pipe (18) through the branch drainage pipe (26), and finally outputs through the scattered top spray nozzle (19); When there is surplus water in the farmland, the surplus water is collected into the collection pool (5) through the drainage ditch (23) and the water pipe (4). When it is necessary to carry out supplementary irrigation, the water filtered through the filter chamber (6) is pumped out by the water pump (7), the second solenoid valve (8) is opened, the third solenoid valve (11) is closed, and the water in the collection pool (5) is transported to the filter (10) through the circulating water pipe (9). After filtration, it is transported to the main irrigation pipe (12), and the variable frequency water pump (13) is turned on to carry out supplementary irrigation.

Images