Seedling raising and sprinkling irrigation system for ecological environment-friendly planting greenhouse

Abstract

The invention relates to the technical field of agricultural engineering, and discloses an ecological environment-friendly planting greenhouse seedling culture sprinkling irrigation system which comprises a water source module, a filtering module, an intelligent control module, an irrigation execution module and an environment-friendly auxiliary module. The rainwater collection unit is connected with the reservoir through a rainwater collection groove in the top of the greenhouse, and the emergency water source unit is provided with a water quality detection sensor; the filtering module comprises a physical grid filtering unit, a gravel filtering or lamination filtering unit and an ultraviolet sterilization unit which are connected in sequence; the intelligent control module comprises a sensor network and a programmable logic controller; and the sensor network comprises soil humidity sensors which are deployed in a distributed manner. According to the system, the irrigation water source is collected and allocated through the water source module, so that the problems of water resource waste and poor seedling growth consistency caused by the adoption of manual monitoring and manual operation modes in most traditional greenhouse seedling raising sprinkling irrigation systems are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural engineering, and in particular to a seedling raising sprinkler irrigation system for an ecological and environmentally friendly planting greenhouse. Background Art

[0002] Agricultural greenhouses are greenhouses built with plastic film. Their advantages are heat preservation and moisture retention, extension of the growth period of seedlings, increase of seed germination rate, protection of seedlings from hazards such as wind, frost and drought. At the same time, there are fewer weeds in agricultural greenhouses, which can increase the effect of seedling cultivation in the greenhouse.

[0003] Traditional greenhouse seedling sprinkler irrigation systems mostly use manual monitoring and manual operation. Due to the high cost of manual intervention and the difficulty in accurately controlling the timing and amount of irrigation, it causes water waste and poor consistency in seedling growth. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides an eco-friendly and environmentally friendly seedling sprinkler irrigation system for greenhouse planting, which solves the problem that most traditional greenhouse seedling sprinkler irrigation systems adopt manual monitoring and manual operation, which causes water waste and poor consistency in seedling growth due to the high cost of manual intervention and the difficulty in accurately controlling the timing and amount of irrigation.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a seedling irrigation system for an eco-friendly greenhouse, comprising a water source module, a filtration module, an intelligent control module, an irrigation execution module and an environmental protection auxiliary module.

[0006] The water source module includes a rainwater collection unit and an emergency water source unit. The rainwater collection unit is connected to the water reservoir through a rainwater collecting trough on the top of the greenhouse. The emergency water source unit is equipped with a water quality detection sensor.

[0007] The filtration module includes a physical grid filtration unit, a sand and gravel filtration unit or a laminated filtration unit and an ultraviolet sterilization unit connected in sequence;

[0008] The intelligent control module includes a sensor network and a programmable logic controller, wherein the sensor network includes distributed soil moisture sensors, air temperature and humidity sensors, and light sensors;

[0009] The irrigation execution module includes switchable atomizing nozzles, refraction nozzles and drip irrigation belts, and the nozzles and drip irrigation belts are connected to the main pipeline through a solenoid valve group;

[0010] The environmental protection auxiliary module includes a water and fertilizer integration unit, a solar power supply unit and a drainage recovery unit.

[0011] By adopting the above technical solution, the water source module is used to collect and allocate irrigation water, providing a stable water supply basis for the system; the filtration module performs multi-stage purification on the water source to ensure the cleanliness of the irrigation water quality; the intelligent control module uses the sensor network to collect environmental data in real time, and combines it with the programmable logic controller to automatically analyze and make decisions to accurately determine the irrigation time; the irrigation execution module switches different types of sprinklers and drip irrigation belts through the solenoid valve group according to the control instructions to achieve precise irrigation; the environmental protection auxiliary module integrates functions such as water and fertilizer integration, solar power supply and drainage recovery to promote resource recycling. The modules work together to realize the full process automation management of seedling sprinkler irrigation, thereby improving the efficiency and accuracy of irrigation management, thereby improving the traditional greenhouse seedling sprinkler irrigation system. Most of them adopt manual monitoring and manual operation. Due to the high cost of manual intervention and the difficulty in accurately controlling the timing and amount of irrigation, water resources are wasted and the growth consistency of seedlings is poor.

[0012] Preferably, the water reservoir is provided with a water level monitoring device and an overflow pipe, the overflow pipe is connected to a rainwater infiltration ditch, and the water quality detection sensor is configured to monitor the pH value and conductivity of the emergency water source unit in real time.

[0013] Preferably, the grid gap of the physical grid filter unit is 5-10 mm, the filtration accuracy of the sand and gravel filter or laminated filter unit is 50-100 μm, the sterilization rate of the ultraviolet sterilization unit is ≥99%, and the filtration module also includes a backwash pipeline and a differential pressure sensor.

[0014] Preferably, the programmable logic controller communicates with the sensor network via the Modbus protocol, the sampling frequency of the sensor network is 1-5 minutes / time, and the programmable logic controller has a built-in irrigation strategy decision model, which is based on a fuzzy control algorithm.

[0015] Preferably, the control algorithm of the irrigation strategy decision model is: U = Kp·E+Ki·∑E+Kd·(EE -1 ); where U is the irrigation control amount, E is the deviation between the current soil moisture and the target moisture, and E -1 is the deviation at the previous moment, Kp, Ki, and Kd are adjustable parameters corresponding to the proportional, integral, and differential coefficients, respectively. The parameters are dynamically adjusted according to the seedling growth stage.

[0016] Preferably, the droplet size of the atomizing nozzle is 50-150 μm, the spraying angle of the refractive nozzle is 90-180°, the flow rate of the drip arrow / drip irrigation belt is 1-4 L / h, and the solenoid valve group includes a main valve and a partition control sub-valve.

[0017] Preferably, the drip arrow / drip irrigation belt is connected to the main pipeline through a branch pipe, and the branch pipe adopts a PE pipe with a nominal outer diameter of 16-25 mm; the irrigation execution module also includes a pressure-compensating dripper, which is arranged at the connection between the branch pipe and the drip arrow / drip irrigation belt, and the working pressure range is 0.05-0.3 MPa.

[0018] Preferably, the water-fertilizer integrated unit includes a venturi fertilizer suction device, a fertilizer pump and a fertilizer concentration sensor, the water inlet of the venturi fertilizer suction device is connected to the water outlet of the filter module, the fertilizer suction port of the venturi fertilizer suction device is connected to the outlet of the fertilizer pump, the inlet of the fertilizer pump is connected to the fertilizer tank, and the fertilizer concentration sensor is arranged between the water outlet of the venturi fertilizer suction device and the main pipeline of the irrigation execution module.

[0019] Preferably, the solar power supply unit includes a photovoltaic array, an MPPT (Maximum Power Point Tracking) controller and a lithium battery pack. The installed power of the photovoltaic array is 1-5kW, the conversion efficiency of the MPPT controller is ≥95%, and the battery life of the lithium battery pack is ≥72 hours.

[0020] A control method for a seedling raising sprinkler irrigation system in an eco-friendly greenhouse comprises the following steps:

[0021] S1. Acquiring multi-point soil moisture data through the distributed soil moisture sensor;

[0022] S2. Comparing the moisture content data with a preset growth stage threshold, where the threshold is dynamically adjusted according to the seedling type;

[0023] S3. When the moisture content of any monitoring point is lower than a threshold, an irrigation decision algorithm is activated to generate an irrigation instruction, wherein the irrigation instruction includes the irrigation form, irrigation duration, and irrigation amount;

[0024] S4, switching to the atomizing nozzle, refraction nozzle or drip irrigation belt through the solenoid valve group to perform irrigation operations;

[0025] S5. During the irrigation process, the soil moisture content change rate is monitored in real time, and irrigation is stopped when the change rate is ≤0.1% / minute.

[0026] The present invention provides an eco-friendly seedling irrigation system for greenhouses. It has the following beneficial effects:

[0027] 1. In the present invention, the water source module collects and allocates irrigation water to provide a stable water supply basis for the system; the filtration module performs multi-stage purification on the water source to ensure the cleanliness of the irrigation water quality; the intelligent control module uses the sensor network to collect environmental data in real time, combines with the programmable logic controller to automatically analyze and make decisions, and accurately judge the irrigation time; the irrigation execution module switches different types of sprinklers and drip irrigation belts through the solenoid valve group according to the control instructions to achieve precise irrigation; the environmental protection auxiliary module integrates the functions of water and fertilizer integration, solar power supply and drainage recovery to promote resource recycling. The coordinated work of each module realizes the full process automation management of seedling sprinkler irrigation, thereby improving the efficiency and accuracy of irrigation management, thereby improving the traditional greenhouse seedling sprinkler irrigation system. Most of them adopt manual monitoring and manual operation. Due to the high cost of manual intervention and the difficulty in accurately controlling the irrigation timing and amount, water resources are wasted and the growth consistency of seedlings is poor.

[0028] 2. In the present invention, the water source module includes a rainwater collection unit and an emergency water source unit. The rainwater collection unit is connected to the water tank through the rainwater collecting trough on the top of the greenhouse. The emergency water source unit is provided with a water quality detection sensor, which realizes the efficient utilization of rainwater resources and the water quality monitoring of the supplementary water source, thereby ensuring the diversification and safety of the irrigation water source, thereby improving the traditional seedling sprinkler irrigation system that mostly relies on a single water source. Due to the lack of rainwater collection and utilization mechanism and the lack of real-time monitoring of the water quality of the supplementary water source, the water resource utilization rate is low and the poor quality water source affects the growth of seedlings.

[0029] 3. In the present invention, the filtration module includes a physical grid filtration unit, a sand and gravel filtration unit or a laminated filtration unit and an ultraviolet sterilization unit connected in sequence, so as to perform multi-stage filtration and sterilization treatment on the water source, thereby ensuring the cleanliness and hygiene standards of the irrigation water, thereby improving the filtration process of the traditional seedling sprinkler irrigation system which only uses a single filter screen to filter, and cannot effectively remove microorganisms and fine impurities in the water, thereby causing the problem of irrigation pipe blockage or increased risk of seedling disease. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 2 Schematic diagram of the system architecture of the present invention;

[0032] Figure 3 This is a schematic diagram of the system architecture of the water source module of the present invention;

[0033] Figure 4 This is a schematic diagram of the system architecture of the filtering module of the present invention;

[0034] Figure 5 This is a schematic diagram of the system architecture of the intelligent control module of the present invention;

[0035] Figure 6 This is a schematic diagram of the system architecture of the irrigation execution module of the present invention;

[0036] Figure 7 This is a schematic diagram of the system architecture of the environmental protection auxiliary module of the present invention;

[0037] Figure 8 Schematic diagram of the method steps of the present invention.

[0038] Among them: 1. Water source module; 110. Rainwater collection unit; 111. Rainwater collection trough; 112. Water reservoir; 113. Overflow pipe; 120. Emergency water source unit; 2. Filtration module; 210. Physical grid filtration unit; 220. Sand and gravel filtration or laminated filtration unit; 230. Ultraviolet sterilization unit; 3. Intelligent control module; 310. Sensor network; 311. Soil moisture sensor; 312. Air temperature and humidity sensor; 313. Light sensor; 320. Programmable logic controller; 4. Irrigation execution module; 410. Atomizing nozzle; 420. Refraction nozzle; 430. Drip arrow / drip irrigation belt; 5. Environmental protection auxiliary module; 510. Water and fertilizer integrated unit; 520. Solar power supply unit; 530. Drainage recovery unit; 6. Greenhouse; 7. Rainwater infiltration ditch. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Please see the attached Figure 1 -Attached Figure 7 The embodiment of the present invention provides an eco-friendly seedling irrigation system for a greenhouse, comprising a water source module 1, a filter module 2, an intelligent control module 3, an irrigation execution module 4, and an environmental protection auxiliary module 5.

[0041] The water source module 1 includes a rainwater collection unit 110 and an emergency water source unit 120. The rainwater collection unit 110 is connected to the water storage tank 112 through the rainwater collecting trough 111 on the top of the shed 6. The emergency water source unit 120 is equipped with a water quality detection sensor.

[0042] The filter module 2 includes a physical grid filter unit 210, a sand filter or laminate filter unit 220 and an ultraviolet sterilization unit 230 connected in sequence;

[0043] The intelligent control module 3 includes a sensor network 310 and a programmable logic controller 320. The sensor network 310 includes a distributed soil moisture sensor 311, an air temperature and humidity sensor 312, and a light sensor 313.

[0044] The irrigation execution module 4 includes a switchable atomizing nozzle 410, a refraction nozzle 420 and a drip irrigation belt 430. The nozzle and the drip irrigation belt are connected to the main pipeline through a solenoid valve group.

[0045] The environmental protection auxiliary module 5 includes a water-fertilizer integrated unit 510 , a solar power supply unit 520 and a drainage recovery unit 530 .

[0046] Specifically, the water source module 1 includes a rainwater collection unit 110 and an emergency water source unit 120. The rainwater collection unit 110 collects rainwater through the rainwater collecting trough 111 on the top of the greenhouse 6 and stores it in the reservoir 112. The emergency water source unit 120 monitors the pH value and conductivity of the supplementary water source through the water quality detection sensor to provide a multi-source water guarantee for the system; the filter module 2 intercepts large particles of impurities through the physical grid filter unit 210 (grid gap 5-10mm), and removes fine particles through the sand and gravel filter or laminated filter unit 220 (filtration accuracy 50-100μm). The ultraviolet sterilization unit 230 (sterilization rate ≥ 99%) kills microorganisms and cooperates with the backwash pipeline and pressure differential sensor to achieve multi-stage water purification; the intelligent control module 3 collects environmental data in real time through the distributed sensor network 310 (soil moisture sensor 311, air temperature and humidity sensor 312, light sensor 313), and the programmable logic controller 320 receives data through the Modbus protocol and runs the irrigation strategy decision model based on the fuzzy control algorithm (the control algorithm is U = Kp·E+Ki·∑E+Kd·(EE -1 ), where U is the irrigation control amount, E is the deviation between the current soil moisture and the target moisture, and E -1is the deviation at the previous moment, Kp / Ki / Kd are the proportional / integral / differential coefficients adjusted dynamically) to achieve automatic irrigation control; the irrigation execution module 4 switches the atomizing nozzle 410 (droplet size 50-150μm), the refractive nozzle 420 (spraying angle 90-180°) and the drip arrow / drip irrigation belt 430 (flow rate 1-4L / h) through the solenoid valve group, and cooperates with the branch pipe (nominal outer diameter 16-25mm PE pipe) and the pressure compensation dripper (working pressure 0.05-0.3MPa) to achieve precise irrigation at different growth stages; the environmental protection auxiliary module 5 realizes precise irrigation at different growth stages through the water-fertilizer integrated unit 510 (the Venturi fertilizer suction device is connected to the filter module outlet and the fertilizer pump, and the fertilizer concentration sensor monitors the mixed solution EC (Electrical Conductivity) value) to achieve synchronous water and fertilizer supply, the solar power supply unit 520 (photovoltaic array 1-5kW, MPPT controller efficiency ≥95%, lithium battery pack life ≥72 hours) provides clean energy, the drainage recovery unit 530 collects and processes excess water for recycling, improving resource utilization; the water source module 1 collects and allocates irrigation water to provide a stable water supply foundation for the system; the filtration module performs multi-stage purification on the water source to ensure the cleanliness of the irrigation water; the intelligent control module 3 uses the sensor network 310 to collect environmental data in real time, combined with the programmable logic controller 320 to automatically analyze The system makes decisions and accurately judges the irrigation timing; the irrigation execution module 4 switches different types of sprinklers and drip irrigation belts through the solenoid valve group according to the control instructions to achieve precise irrigation; the environmental protection auxiliary module 5 integrates functions such as water and fertilizer integration, solar power supply and drainage recovery to promote resource recycling. The modules work together to realize the full process automation management of seedling sprinkler irrigation, thereby improving the efficiency and accuracy of irrigation management, thereby improving the traditional greenhouse seedling sprinkler irrigation system. Most of them adopt manual monitoring and manual operation. Due to the high cost of manual intervention and the difficulty in accurately controlling the irrigation timing and amount, water resources are wasted and the growth consistency of seedlings is poor.

[0047] The water reservoir 112 is provided with a water level monitoring device and an overflow pipe 113 . The overflow pipe 113 is connected to the rainwater infiltration ditch 7 . The water quality detection sensor is configured to monitor the pH value and conductivity of the emergency water source unit 120 in real time.

[0048] Specifically, the water reservoir 112 obtains water level data in real time through the water level monitoring device, providing a basis for water allocation; the overflow pipe 113 discharges excess rainwater when the water level exceeds the threshold to prevent the water level of the water reservoir 112 from being too high; the overflow pipe 113 is connected to the rainwater infiltration ditch 7 to guide the overflowing rainwater to seep into the soil, replenish groundwater and reduce surface runoff; the water quality detection sensor monitors the pH value and conductivity of the emergency water source unit 120 in real time to ensure that the water quality of the supplementary water source meets the irrigation standards and avoid the impact of poor quality water sources on seedling growth.

[0049] The grid gap of the physical grid filter unit 210 is 5-10 mm, the filtration accuracy of the sand and gravel filter or laminated filter unit 220 is 50-100 μm, the sterilization rate of the ultraviolet sterilization unit 230 is ≥99%, and the filter module 2 also includes a backwash pipeline and a differential pressure sensor.

[0050] Specifically, the physical grid filter unit 210 has a grid gap of 5-10mm, which can intercept large particles of impurities such as dead branches and fallen leaves in rainwater, and preliminarily purify the water source; the gravel filter or laminated filter unit 220 removes fine particles such as suspended matter and colloids with a filtration accuracy of 50-100μm, further improving water quality; the ultraviolet sterilization unit 230 kills bacteria, viruses and other microorganisms in the water with a sterilization rate of ≥99%, preventing water source pollution; when the pressure differential sensor detects that the pressure difference between the inlet and outlet of the filter unit exceeds the set value, the backwash pipeline automatically flushes and intercepts impurities, maintains filtration efficiency, and ensures that the irrigation water is clean and sterile.

[0051] The programmable logic controller 320 communicates with the sensor network 310 via the Modbus protocol. The sampling frequency of the sensor network 310 is 1-5 minutes / time. The programmable logic controller 320 has a built-in irrigation strategy decision model, which is based on a fuzzy control algorithm.

[0052] Specifically, the programmable logic controller 320 communicates with the sensor network 310 through the Modbus protocol to achieve real-time transmission of data from the soil moisture sensor 311, the air temperature and humidity sensor 312, and the light sensor 313; the sensor network 310 obtains environmental parameters at a sampling frequency of 1-5 minutes per time to ensure data timeliness; the programmable logic controller 320 has a built-in irrigation strategy decision model based on the fuzzy control algorithm, which generates irrigation instructions by processing real-time data, dynamically adjusts the irrigation form, duration, and amount, realizes precise irrigation control during the seedling growth stage, and improves the system's automation and adaptability.

[0053] The control algorithm of the irrigation strategy decision model is: U = Kp·E+Ki·∑E+Kd·(EE -1 ); where U is the irrigation control amount, E is the deviation between the current soil moisture and the target moisture, and E -1 is the deviation at the previous moment, Kp, Ki, and Kd are adjustable parameters, corresponding to the proportional, integral, and differential coefficients, respectively. The parameters are dynamically adjusted according to the seedling growth stage.

[0054] Specifically, the irrigation strategy decision model is implemented through the control algorithm U=Kp·E+Ki·∑E+Kd·(EE -1 ) Calculate the irrigation control amount U, where E is the deviation between the current soil moisture and the target moisture, which is used to reflect the current water demand difference; E -1is the deviation at the previous moment, which is used to reflect the deviation change trend; the proportional coefficient Kp, integral coefficient Ki, and differential coefficient Kd correspond to adjusting the current deviation response intensity, eliminating steady-state error, and predicting the deviation change rate, respectively. The three are dynamically adjusted according to the seedling growth stage, so that the system can accurately output irrigation control signals according to the dynamic changes in soil moisture, realize adaptive adjustment of irrigation amount, and improve the matching degree between irrigation efficiency and seedling growth.

[0055] The droplet size of the atomizing nozzle 410 is 50-150 μm, the spraying angle of the refractive nozzle 420 is 90-180°, the flow rate of the drip arrow / drip irrigation tape 430 is 1-4 L / h, and the solenoid valve group includes a main valve and a partition control sub-valve.

[0056] Specifically, the atomizing nozzle 410 evenly covers the seedling bed with a droplet size of 50-150μm, which is suitable for gentle irrigation during the seedling stage to avoid impacting the seedlings; the refractive nozzle 420 simulates natural rainfall with a spray angle of 90-180°, which is suitable for the seedling hardening stage before transplanting; the drip arrow / drip irrigation belt 430 accurately drips to the roots of the seedlings at a flow rate of 1-4L / h, which is water-saving and efficient; the solenoid valve group controls the overall on-off of the irrigation system through the main valve, and the partition control sub-valves realize independent irrigation of different seedling bed areas, and cooperates with the switching of different nozzle types to meet the differentiated irrigation needs of the seedlings throughout the growth cycle.

[0057] The drip arrow / drip irrigation belt 430 is connected to the main pipeline through a branch pipe, and the branch pipe adopts a PE pipe with a nominal outer diameter of 16-25 mm; the irrigation execution module 4 also includes a pressure-compensating dripper 440, which is arranged at the connection between the branch pipe and the drip arrow / drip irrigation belt 430, and the working pressure range is 0.05-0.3 MPa.

[0058] Specifically, the drip arrow / drip tape 430 is connected to the main pipe through a branch pipe. The branch pipe adopts a PE pipe with a nominal outer diameter of 16-25mm to realize the distribution and transmission of water from the main pipe to each irrigation point; the pressure-compensating dripper 440 of the irrigation execution module 4 is set at the connection between the branch pipe and the drip arrow / drip tape 430. Its 0.05-0.3MPa working pressure range can automatically balance the water pressure fluctuations of branches at different positions, ensuring uniform and stable flow at each drip irrigation point, avoiding uneven irrigation due to water pressure differences, and improving the accuracy and reliability of the drip irrigation system.

[0059] The water-fertilizer integrated unit 510 includes a venturi fertilizer suction device, a fertilizer pump and a fertilizer concentration sensor. The water inlet of the venturi fertilizer suction device is connected to the water outlet of the filter module 2, the fertilizer suction port of the venturi fertilizer suction device is connected to the outlet of the fertilizer pump, and the inlet of the fertilizer pump is connected to the fertilizer tank. The fertilizer concentration sensor is arranged between the water outlet of the venturi fertilizer suction device and the main pipeline of the irrigation execution module 4.

[0060] Specifically, the water-fertilizer integrated unit 510 is connected to the water outlet of the filter module 2 through the water inlet of the venturi fertilizer absorber, and uses the pressure difference generated by the irrigation water flowing through the venturi fertilizer absorber to suck in the fertilizer solution from the fertilizer pump outlet (the fertilizer pump inlet is connected to the fertilizer tank) to achieve the mixing of fertilizer and irrigation water; the fertilizer concentration sensor is arranged between the water outlet of the venturi fertilizer absorber and the main pipeline of the irrigation execution module 4 to monitor the ion concentration of the mixed solution in real time to ensure that the fertilizer concentration is accurately controllable, realize the integrated operation of "water with fertilizer", improve fertilizer utilization and reduce waste.

[0061] The solar power supply unit 520 includes a photovoltaic array, an MPPT controller and a lithium battery pack. The installed power of the photovoltaic array is 1-5kW, the conversion efficiency of the MPPT controller is ≥95%, and the battery life of the lithium battery pack is ≥72 hours.

[0062] Specifically, the solar power supply unit 520 converts solar energy into electrical energy through a photovoltaic array (installed power 1-5kW), and the MPPT controller (conversion efficiency ≥ 95%) optimizes the power output of the photovoltaic array and improves the efficiency of electrical energy conversion; the lithium battery pack (battery life ≥ 72 hours) stores electrical energy and powers the programmable logic controller 320, water pumps and other equipment, enabling system offline operation, reducing dependence on traditional power grids, reducing energy consumption and carbon emissions, and ensuring continuous power supply to the irrigation system in continuous rainy weather.

[0063] Please see the attached Figure 1 -Attached Figure 8 A control method for a seedling raising sprinkler irrigation system in an eco-friendly greenhouse comprises the following steps:

[0064] S1. Acquire multi-point soil moisture data through distributed soil moisture sensors 311;

[0065] S2, comparing the moisture content data with the preset growth stage threshold, and the threshold is dynamically adjusted according to the seedling type;

[0066] S3. When the moisture content of any monitoring point is lower than the threshold, the irrigation decision algorithm is activated to generate irrigation instructions, which include irrigation form, irrigation duration, and irrigation amount;

[0067] S4. Switch to the atomizing nozzle 410, the refractive nozzle 420 or the drip irrigation tape 430 through the solenoid valve group to perform irrigation operations;

[0068] S5. During the irrigation process, the soil moisture content change rate is monitored in real time, and irrigation is stopped when the change rate is ≤0.1% / minute.

[0069] Specifically, S1 obtains multi-point soil moisture data through distributed soil moisture sensors 311 to achieve comprehensive monitoring of soil moisture in the seedling bed; S2 compares the moisture content data with the preset growth stage threshold (the threshold is dynamically adjusted according to the seedling type) to provide a quantitative basis for irrigation decisions; S3 starts the irrigation decision algorithm to generate instructions including irrigation form, duration, and amount when the moisture content of any monitoring point is lower than the threshold, ensuring timely and accurate response to water needs; S4 switches the atomizing nozzle 410, the refractive nozzle 420 or the drip arrow / drip irrigation belt 430 through the solenoid valve group to perform irrigation to match the irrigation needs of seedlings at different growth stages; S5 monitors the soil moisture content change rate in real time, and stops irrigation when the change rate is ≤0.1% / minute to avoid over-irrigation and ensure sufficient water absorption, thereby achieving water saving and precise irrigation control.

[0070] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A seedling raising sprinkler irrigation system for an eco-friendly greenhouse, comprising a water source module (1), a filtering module (2), an intelligent control module (3), an irrigation execution module (4) and an environmental protection auxiliary module (5), characterized in that: The water source module (1) comprises a rainwater collection unit (110) and an emergency water source unit (120); the rainwater collection unit (110) is connected to a water reservoir (112) via a rainwater collecting trough (111) on the top of a shed (6); and the emergency water source unit (120) is provided with a water quality detection sensor; The filtration module (2) comprises a physical grid filtration unit (210), a sand and gravel filtration or laminated filtration unit (220), and an ultraviolet sterilization unit (230) connected in sequence; The intelligent control module (3) includes a sensor network (310) and a programmable logic controller (320), wherein the sensor network (310) includes a distributed soil moisture sensor (311), an air temperature and humidity sensor (312), and a light sensor (313); The irrigation execution module (4) includes a switchable atomizing nozzle (410), a refraction nozzle (420) and a drip irrigation belt (430), wherein the nozzle and the drip irrigation belt are connected to the main pipeline via a solenoid valve group; The environmental protection auxiliary module (5) comprises a water-fertilizer integrated unit (510), a solar power supply unit (520) and a drainage recovery unit (530).

2. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 1, characterized in that: The water reservoir (112) is provided with a water level monitoring device and an overflow pipe (113), the overflow pipe (113) is connected to the rainwater infiltration ditch (7), and the water quality detection sensor is configured to monitor the pH value and conductivity of the emergency water source unit (120) in real time.

3. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 1, characterized in that: The grid gap of the physical grid filter unit (210) is 5-10 mm, the filtration accuracy of the sand and gravel filter or laminated filter unit (220) is 50-100 μm, the sterilization rate of the ultraviolet sterilization unit (230) is ≥99%, and the filter module (2) further includes a backwash pipeline and a differential pressure sensor.

4. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 1, characterized in that: The programmable logic controller (320) communicates with the sensor network (310) via a Modbus protocol. The sampling frequency of the sensor network (310) is 1-5 minutes / time. The programmable logic controller (320) has a built-in irrigation strategy decision model, and the decision model is based on a fuzzy control algorithm.

5. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 4, characterized in that: The control algorithm of the irrigation strategy decision model is: U = Kp·E+Ki·∑E+Kd·(EE -1 ); where U is the irrigation control amount, E is the deviation between the current soil moisture and the target moisture, and E -1 is the deviation at the previous moment, Kp, Ki, and Kd are adjustable parameters corresponding to the proportional, integral, and differential coefficients, respectively. The parameters are dynamically adjusted according to the seedling growth stage.

6. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 1, characterized in that: The droplet diameter of the atomizing nozzle (410) is 50-150 μm, the spraying angle of the refractive nozzle (420) is 90-180°, the flow rate of the drip arrow / drip irrigation tape (430) is 1-4 L / h, and the solenoid valve group includes a main valve and a partition control sub-valve.

7. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 6, characterized in that: The drip arrow / drip irrigation belt (430) is connected to the main pipeline via a branch pipe, and the branch pipe adopts a PE pipe with a nominal outer diameter of 16-25 mm; the irrigation execution module (4) also includes a pressure-compensating dripper (440), and the pressure-compensating dripper (440) is arranged at the connection between the branch pipe and the drip arrow / drip irrigation belt (430), and the operating pressure range is 0.05-0.3 MPa.

8. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 1, characterized in that: The water-fertilizer integrated unit (510) comprises a venturi fertilizer suction device, a fertilizer pump, and a fertilizer concentration sensor. The water inlet of the venturi fertilizer suction device is connected to the water outlet of the filter module (2), the fertilizer suction port of the venturi fertilizer suction device is connected to the outlet of the fertilizer pump, the inlet of the fertilizer pump is connected to a fertilizer tank, and the fertilizer concentration sensor is arranged between the water outlet of the venturi fertilizer suction device and the main pipeline of the irrigation execution module (4).

9. The eco-friendly seedling raising sprinkler irrigation system for greenhouses according to claim 1, characterized in that: The solar power supply unit (520) comprises a photovoltaic array, an MPPT controller and a lithium battery pack. The installed power of the photovoltaic array is 1-5kW, the conversion efficiency of the MPPT controller is ≥95%, and the battery life of the lithium battery pack is ≥72 hours.

10. A control method for a seedling raising sprinkler irrigation system for an eco-friendly planting greenhouse, applied to the seedling raising sprinkler irrigation system for an eco-friendly planting greenhouse according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, acquiring multi-point soil moisture data through the distributed soil moisture sensor (311); S2. Comparing the moisture content data with a preset growth stage threshold, where the threshold is dynamically adjusted according to the seedling type; S3. When the moisture content of any monitoring point is lower than a threshold, an irrigation decision algorithm is activated to generate an irrigation instruction, wherein the irrigation instruction includes the irrigation form, irrigation duration, and irrigation amount; S4, switching to the atomizing nozzle (410), the refractive nozzle (420) or the dripping arrow / drip irrigation belt (430) through the solenoid valve group to perform irrigation operations; S5. During the irrigation process, the soil moisture content change rate is monitored in real time, and irrigation is stopped when the change rate is ≤0.1% / minute.

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