Water-fertilizer integrated intelligent irrigation control method suitable for rack cultivation

Abstract

The invention discloses an intelligent irrigation control method for integrated water and fertilizer for rack cultivation, comprising a multi-layer planting rack part, an irrigation control part and a lifting control part. The multi-layer planting rack is provided with a multi-layer cultivation substrate, and a clay tube is provided in the cultivation substrate layer. The equal lever principle of the pulley device is used to realize the conversion of the self-potential energy of the liquid storage tank. The electric push rod device only needs to overcome the system resistance to change the height position of the liquid storage tank. The controller controls the switch of the solenoid valve and the lifting and lowering of the liquid storage tank according to the feedback data of the sensor to realize the positive and negative pressure supply of water, fertilizer and nutrients to the clay tube, so as to keep the moisture content of the cultivation substrate always within the optimal moisture content range required for the growth of vegetables, so as to truly realize the intelligent supply of water, fertilizer and nutrients required by different types of vegetables at multiple layers and the same vegetable in different growth periods.

Description

Technical Field

[0001] The invention relates to the technical field of cultivation irrigation, and in particular to a water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation. Background Art

[0002] At present, greenhouse vegetable cultivation mostly adopts drip irrigation, sprinkler irrigation and other irrigation methods. The cost of drip irrigation device is relatively high. Due to the influence of impurities and mineral precipitation, the capillary dripper will be blocked; the uniformity of drip irrigation is not easy to ensure, and it will also cause salt accumulation. When drip irrigation is carried out on a cultivation substrate with high salt content or drip irrigation with salt water, salt will accumulate at the edge of the wet area, causing salt damage. The disadvantage of using sprinkler irrigation to irrigate from above the plants is that the wet leaves of vegetables may cause the risk of plant diseases. Although the micro-sprinkler irrigation system close to the ground can transport water to the base of the plant, it can reduce the risk of plant disease development, but the number of such micro-sprinkler irrigation systems close to the ground is limited, and it is difficult to achieve uniform irrigation. In addition, except for the self-pressure sprinkler irrigation device, the sprinkler irrigation device requires external energy supply. How to solve the energy supply and automatic water and fertilizer replenishment during the planting process has become a hot issue.

[0003] The existing rack cultivation, i.e., multi-layer cultivation method, can significantly improve the internal hierarchical structure of the greenhouse and greatly improve the utilization rate of the greenhouse space. Secondly, it raises the distance between the vegetables and the ground, which can effectively avoid and reduce the occurrence of vegetable diseases and insect pests, and also provides certain conditions for the implementation of negative pressure water supply technology and the arrangement of water-fertilizer integrated intelligent irrigation devices. As a new type of water supply technology, negative pressure irrigation technology uses the matrix potential of the cultivation matrix as the irrigation power, can realize automatic water supply without external energy, steadily maintain the moisture status of the cultivation matrix, can effectively reduce water evaporation and water leakage between plants, and can greatly improve the water utilization efficiency of vegetables. In the present invention, negative pressure irrigation is combined with water-fertilizer integrated technology to improve the utilization rate of water and fertilizer and significantly improve the quality of vegetables. At the same time, positive pressure irrigation can be implemented when the set conditions are met, and the set value of the matrix moisture content can be reached quickly to supplement the water required by the vegetables. And due to the uniform water discharge characteristics of the irrigation device, the root area of ​​the vegetables always maintains uniform humidity. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation to solve the problems in the above-mentioned background technology.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0006] The present invention comprises a multi-layer planting frame part, an irrigation control part and a lifting control part, wherein the multi-layer planting frame part comprises a support frame, a cultivation substrate and a clay tube, the support frame is provided with a multi-layer cultivation substrate, and each layer of the cultivation substrate is provided with a clay tube, the irrigation control part comprises a water-fertilizer integrated tank, a liquid storage tank, a temperature and humidity sensor, a controller, a multi-way pipe joint, a liquid level sensor and a normally open and normally closed electromagnetic valve, the water-fertilizer integrated tank, the liquid storage tank, the electromagnetic valve, the multi-way pipe joint and the clay tube are connected by a liquid infusion pipeline, the controller receives signals from the temperature and humidity sensor and the liquid level sensor and controls the normally open and normally closed electromagnetic valves When power is on or off, the outlet of the water-fertilizer integrated tank is connected to the inlets of the first normally closed solenoid valve and the second normally closed solenoid valve through the first multi-way pipe joint, the outlet of the first normally closed solenoid valve is connected to the inlet of the first liquid storage tank, the outlet of the second normally closed solenoid valve is connected to the inlet of the second liquid storage tank, the outlet of the first liquid storage tank is connected to the inlet of the second multi-way pipe joint, the inlets of the four-layer normally open solenoid valve, the five-layer normally open solenoid valve, the six-layer normally open solenoid valve, and the third normally closed solenoid valve are respectively connected to the outlet of the second multi-way pipe joint, the outlet of the four-layer normally open solenoid valve is connected to the four-layer clay pipe, and the outlet of the five-layer normally open solenoid valve is connected to the five-layer clay pipe The outlet of the six-layer normally open solenoid valve is connected to the six-layer clay pipe, the outlet of the third normally closed solenoid valve is connected to the inlet of the third multi-way pipe joint, the inlets of the first-layer normally open solenoid valve, the second-layer normally open solenoid valve, and the third-layer normally open solenoid valve are respectively connected to the outlet of the third multi-way pipe joint, the outlet of the first-layer normally open solenoid valve is connected to the first-layer clay pipe, the outlet of the second-layer normally open solenoid valve is connected to the second-layer clay pipe, the outlet of the third-layer normally open solenoid valve is connected to the third-layer clay pipe, the inlets of the first normally open solenoid valve and the fourth normally closed solenoid valve are respectively connected to the outlet of the second liquid storage tank, and the outlet of the fourth normally closed solenoid valve is connected to the inlet of the second multi-way pipe joint. , the outlet of the first normally open solenoid valve is connected to the inlet of the fourth multi-way pipe joint, and the outlet of the fourth multi-way pipe joint is respectively connected to the inlets of the first layer normally open solenoid valve, the second layer normally open solenoid valve, and the third layer normally open solenoid valve. The lifting control part includes a pulley device, a non-slip sheet, a support plate, a weighing sensor, an electric push rod device, and a cable. The cable passes through the pulley device, and liquid storage tanks are respectively provided at both ends of the cable, and non-slip sheets are respectively provided at both ends of the cable to limit the relative position of the liquid storage tank when running up and down. Electric push rod devices are respectively provided at the lower ends of the liquid storage tanks. The controller controls the lifting and lowering of the electric push rod device to support and limit the liquid storage tank;

[0007] The second electric push rod device pushes the first liquid storage tank, and the first electric push rod device pushes the second liquid storage tank to the initial height, and keeps the cable in a tensioned state. The controller controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered on and opened, and injects the water, fertilizer and nutrient liquid in the water-fertilizer integrated tank into the first liquid storage tank and the second liquid storage tank respectively. When the second liquid level sensor and the third liquid level sensor respectively detect that the liquid level value reaches the set value, the controller controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered off and closed, and stops delivering water, fertilizer and nutrient liquid to the first liquid storage tank and the second liquid storage tank, completing the first liquid injection. During this process, each normally open solenoid valve is in a power-off normally open state, and each normally closed solenoid valve is in a power-off normally closed state. The water, fertilizer and nutrient liquid in the first liquid storage tank is respectively delivered to the four-layer clay pipe, the five-layer clay pipe and the six-layer clay pipe through negative pressure irrigation. The water, fertilizer and nutrient liquid in the second liquid storage tank is respectively delivered to the one-layer clay pipe, the two-layer clay pipe and the three-layer clay pipe through negative pressure irrigation. When the second liquid level sensor in the first liquid storage tank detects that the liquid level is lower than the set value, the controller controls the first normally closed solenoid valve to be energized and open, and the first liquid storage tank is injected with liquid until the liquid level returns to the set value. The controller controls the first normally closed solenoid valve to be de-energized and closed, and the injection of liquid into the first liquid storage tank is stopped. This cycle is repeated. When the third liquid level sensor in the second liquid storage tank detects that the liquid level is lower than the set value, the controller controls the second normally closed solenoid valve to be energized and closed. When the controller is powered on, it opens and fills the second liquid storage tank with liquid. When the liquid level returns to the set value, the controller controls the second normally closed solenoid valve to close when it loses power, and stops filling the second liquid storage tank. This cycle repeats. When the first liquid level sensor in the water-fertilizer integrated tank detects that the liquid level is lower than the set value, the controller issues an alarm to prompt the staff to add water, fertilizer and nutrients in time. With the growth of vegetables and changes in climate, negative pressure irrigation may not be able to meet the growth needs of vegetables. When the humidity of the cultivation substrate is lower than the set lower limit, the controller controls the switch of the solenoid valve and the height of the liquid storage tank for normal pressure or positive pressure irrigation. When the normal pressure or positive pressure irrigation reaches the set median value of the humidity of the cultivation substrate, the controller controls the opening of the solenoid valve. The height of the liquid storage tank switches the irrigation mode to negative pressure or pause state. Due to the hysteresis effect of soil water absorption, after reaching the detection median, as the water further penetrates, the humidity of the cultivation matrix will approach the upper limit. The first liquid storage tank and the second liquid storage tank can respectively perform negative pressure, normal pressure or positive pressure irrigation on the first, second, third, fourth, fifth and sixth layers. The first liquid storage tank can perform normal pressure or positive pressure irrigation on the first, second and third layers while performing negative pressure irrigation on the fourth, fifth and sixth layers. The second liquid storage tank can perform negative pressure irrigation on the fourth, fifth and sixth layers while performing normal pressure or positive pressure irrigation on the first, second and third layers. The first liquid storage tank and the second liquid storage tank can be used alternately. The specific control steps are as follows:

[0008] 1. The second liquid storage tank is used for normal pressure or positive pressure irrigation of the first, second and third floors

[0009] When the humidity of the first, second and third layers of the cultivation substrate is lower than the set lower limit, the first electric push rod device pushes the second liquid storage tank upward.

[0010] Normal pressure or positive pressure irrigation is performed. If normal pressure or positive pressure irrigation is performed only on the first floor or on both the first and second floors at the same time, the controller does not need to perform command control on the normally open solenoid valve on the first floor or on both the normally open solenoid valve on the first floor and the normally open solenoid valve on the second floor at the same time. The normally open solenoid valve on the first floor, the normally open solenoid valve on the second floor, and the normally open solenoid valve on the third floor are all in a power-off normally open state. If normal pressure or positive pressure irrigation is performed only on the third floor or on both the second and third floors at the same time, the controller performs command control on the normally open solenoid valve on the first floor, the normally open solenoid valve on the second floor, or on the normally open solenoid valve on the first floor alone, that is, when normal pressure or positive pressure irrigation is performed only on the third floor, the normally open solenoid valve on the first floor and the normally open solenoid valve on the second floor are in a powered closed state. When normal pressure or positive pressure irrigation is performed on the second and third floors, the normally open solenoid valve on the first floor is in a powered closed state. During this process, the third normally closed solenoid valve and the fourth normally closed solenoid valve are both in a power-off closed state.

[0011] 2. The first liquid storage tank is used for normal pressure or positive pressure irrigation of the fourth, fifth and sixth floors

[0012] When the humidity of the cultivation substrate on the fourth, fifth, and sixth layers is lower than the set lower limit, the second electric push rod device pushes the first liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the fourth layer or on the fourth and fifth layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the fourth layer or on the normally open solenoid valve on the fourth layer and the normally open solenoid valve on the fifth layer at the same time. The normally open solenoid valve on the fourth layer, the normally open solenoid valve on the fifth layer, and the normally open solenoid valve on the sixth layer are all in the normally open state without power. If only the sixth layer or on the fifth layer are irrigated at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the fourth layer or on the normally open solenoid valve on the fourth layer and the normally open solenoid valve on the fifth layer at the same time. When the fifth and sixth floors are irrigated at normal pressure or positive pressure, the controller commands and controls the normally open solenoid valve on the fourth floor, the normally open solenoid valve on the fifth floor, or the normally open solenoid valve on the fourth floor alone, that is, when only the sixth floor is irrigated at normal pressure or positive pressure, the normally open solenoid valve on the fourth floor and the normally open solenoid valve on the fifth floor are in an energized closed state; when the fifth and sixth floors are irrigated at normal pressure or positive pressure, the normally open solenoid valve on the fourth floor is in an energized closed state. During this process, the third normally closed solenoid valve and the fourth normally closed solenoid valve are both in a de-energized closed state.

[0013] 3. The second liquid storage tank is used for normal pressure or positive pressure irrigation of the fourth, fifth and sixth floors

[0014] When the humidity of the cultivation substrate of the fourth, fifth, and sixth layers is lower than the set lower limit, the first electric push rod device pushes the second liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the fourth layer or on the fourth and fifth layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve of the fourth layer or on the normally open solenoid valve of the fourth layer and the normally open solenoid valve of the fifth layer at the same time. The normally open solenoid valve of the fourth layer, the normally open solenoid valve of the fifth layer, and the normally open solenoid valve of the sixth layer are all in the normally open state without power. If normal pressure or positive pressure irrigation is only performed on the sixth layer or on the fifth and sixth layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve of the fourth layer or on the normally open solenoid valve of the fourth layer and the normally open solenoid valve of the fifth layer. During normal pressure irrigation, the controller respectively commands and controls the normally open solenoid valves on the fourth floor and the normally open solenoid valves on the fifth floor, or only the normally open solenoid valves on the fourth floor, that is, when only the sixth floor is irrigated with normal pressure or positive pressure, the normally open solenoid valves on the fourth floor and the normally open solenoid valves on the fifth floor are in an energized closed state; when the fifth and sixth floors are irrigated with normal pressure or positive pressure, the normally open solenoid valves on the fourth floor are in an energized closed state. During this process, the third normally closed solenoid valve is in a de-energized closed state, the fourth normally closed solenoid valve is in an energized open state, and the first normally open solenoid valve is in an energized closed state;

[0015] 4. The first liquid storage tank is used for normal pressure or positive pressure irrigation of the first, second and third floors

[0016] When the humidity of the first, second, and third layers of the cultivation substrate is lower than the set lower limit, the second electric push rod device pushes the first liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the first layer or on the first and second layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the first layer or on the normally open solenoid valve on the first layer and the normally open solenoid valve on the second layer at the same time. The normally open solenoid valve on the first layer, the normally open solenoid valve on the second layer, and the normally open solenoid valve on the third layer are all in the normally open state without power. If normal pressure or positive pressure irrigation is only performed on the third layer or on the second and third layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the first layer or on the normally open solenoid valve on the first layer and the normally open solenoid valve on the second layer. During normal pressure irrigation, the controller respectively commands and controls the normally open solenoid valve on the first layer, the normally open solenoid valve on the second layer, or the normally open solenoid valve on the first layer alone, that is, when only the third layer is irrigated with normal pressure or positive pressure, the normally open solenoid valve on the first layer and the normally open solenoid valve on the second layer are in an energized closed state, and when the second and third layers are irrigated with normal pressure or positive pressure, the normally open solenoid valve on the first layer is in an energized closed state. During this process, the third normally closed solenoid valve is in an energized open state, the fourth normally closed solenoid valve is in a de-energized closed state, and the first normally open solenoid valve is in an energized closed state;

[0017] 5. The first liquid storage tank is used for normal pressure or positive pressure irrigation of the first, second, third, fourth, fifth and sixth floors.

[0018] When the humidity of the first, second, third, fourth, fifth and sixth layers of the cultivation substrate is lower than the set lower limit, the second electric push rod device pushes the first liquid storage tank upward for normal pressure or positive pressure irrigation. During this process, the fourth normally closed solenoid valve is in a power-off closed state, the first normally open solenoid valve is in a power-on closed state, the third normally closed solenoid valve is in a power-on open state, and the first normally open solenoid valve, the second normally open solenoid valve, the third normally open solenoid valve, the fourth normally open solenoid valve, the fifth normally open solenoid valve and the sixth normally open solenoid valve are all in a power-off normally open state.

[0019] In the present invention, a support roller is arranged at the bottom of the support frame to facilitate the movement of the multi-layer planting frame, the number of cultivation substrate layers is ≥2, and vegetables are planted on the cultivation substrate.

[0020] In the present invention, the number of liquid storage tanks is ≥2, the number of temperature and humidity sensors set on each layer of cultivation substrate is ≥2, and the number of water-fertilizer integrated irrigation and liquid level sensors in the liquid storage tank is ≥1.

[0021] In the present invention, the liquid of water, fertilizer and nutrient is stored in the integrated water and fertilizer tank, and liquid level sensors are respectively arranged in the integrated water and fertilizer tank and the liquid storage tank, and temperature and humidity sensors are arranged on each layer of the cultivation substrate.

[0022] In the present invention, the pulley device is arranged on the crossbeam in the vegetable greenhouse, and the rotation centers of the pulleys are in the same horizontal plane.

[0023] In the present invention, a supporting plate is arranged at the top end of the electric push rod device, and a weighing sensor is arranged between the supporting plate and the liquid storage tank.

[0024] In the present invention, each normally open solenoid valve is in a normally open state when power is lost, and power loss is a normal state, and each normally closed solenoid valve is in a normally closed state when power is lost, and power loss is a normal state.

[0025] In the present invention, the position of the integrated water-fertilizer tank is higher than the highest position that the liquid storage tank can reach, and the highest position that the liquid storage tank can reach is higher than the upper surface of the cultivation substrate where the six-layer clay tube is located. The one-layer clay tube is located at the bottom layer of the support frame, and the six-layer clay tube is located at the highest layer of the support frame. The one-layer clay tube to the six-layer clay tube are arranged in sequence from low to high. The initial height of the first liquid storage tank is between the third layer and the fourth layer, and the initial height of the second liquid storage tank is lower than the first layer.

[0026] In the present invention, when each layer is irrigated at normal pressure or positive pressure, when the humidity of the cultivation substrate of the corresponding layer reaches the set median value, the solenoid valve of the corresponding layer can be closed. For the selection of various normal pressure and positive pressure irrigation methods, the controller optimizes and analyzes the feedback data of the temperature and humidity sensors, the second liquid level sensor, the third liquid level sensor, the first weighing sensor, and the second weighing sensor of each layer, and then outputs a control instruction to perform normal pressure or positive pressure irrigation. When the humidity of the cultivation substrate of each layer reaches the set median value, the controller issues an instruction to restore the first liquid storage tank and the second liquid storage tank to the initial height, and all solenoid valves also return to normal. At this point, the irrigation system returns to the negative pressure irrigation state, and negative pressure irrigation is the main form of irrigation.

[0027] In the present invention, negative pressure, normal pressure or positive pressure irrigation requires adjusting the height of the first liquid storage tank and the second liquid storage tank. When the weight of the first liquid storage tank is greater than the weight of the second liquid storage tank, the feedback value of the second weighing sensor is greater than the feedback value of the first weighing sensor. At this time, the controller gives an instruction according to the feedback difference between the two, so that the second normally closed solenoid valve is powered on and opened, and the second liquid storage tank is filled with liquid until the weight of the second liquid storage tank is consistent with the weight of the first liquid storage tank. The controller issues an instruction to de-energize the second normally closed solenoid valve and close to stop filling the second liquid storage tank. At this time, the controller issues an instruction to control the operation of the first electric push rod device and the second electric push rod device. If the first electric push rod device goes down, the second electric push rod device goes up, and if the first electric push rod device goes up, the second electric push rod device goes down, and the strokes of the two are equal.

[0028] On the contrary, if the weight of the second liquid storage tank is greater than the weight of the first liquid storage tank, the controller gives an instruction to the first normally closed solenoid valve to be energized and opened to fill the first liquid storage tank with liquid until the weight of the first liquid storage tank is consistent with the weight of the second liquid storage tank. The controller then sends an instruction to the first normally closed solenoid valve to be de-energized and closed to stop filling the first liquid storage tank with liquid.

[0029] In the present invention, as irrigation proceeds, nutrients in the first liquid storage tank and the second liquid storage tank are consumed. When the weights of the two are inconsistent and up and down movement is required, nutrients are supplemented according to the above control method, and the up and down movement is controlled again after the weights are consistent.

[0030] When the second liquid level sensor and the third liquid level sensor respectively detect that the nutrient storage amount in the first liquid storage tank and the second liquid storage tank is small, the first normally closed solenoid valve and the second normally closed solenoid valve can be opened at the same time to inject liquid therein respectively. When one of the liquid level sensors detects that the capacity in the liquid storage tank has reached the upper limit value, the corresponding solenoid valve is closed first to stop the injection. When the feedback values ​​of the two weighing sensors are consistent, the other solenoid valve is closed to stop the injection.

[0031] Beneficial effects: The present invention combines negative pressure water supply technology with actual production, and based on the new irrigation technology of negative pressure irrigation, constitutes a water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation, which can better save water, fertilizer and external energy; secondly, it can accurately monitor and control the changes in the moisture content of each layer of the matrix, and realize precise control of root fertilization and irrigation; it has strong adaptability and occupies a small space. On the same multi-layer planting rack, it can meet the water and fertilizer requirements of different vegetables or the same vegetables in different growth periods; it has a high degree of automation, is green and environmentally friendly, has low energy consumption, is simple and convenient to operate, and can be widely used in existing greenhouse vegetable soil or soilless frame cultivation.

[0032] In response to the long-term efficient and intelligent irrigation of the system, dual-line multi-mode operation is adopted for positive and negative pressure irrigation of each layer, which can effectively prevent the untimely supply caused by local failure of pipelines or control systems, thereby effectively avoiding affecting the growth of vegetables and greatly reducing the maintenance cost of the system; under the normal state dominated by negative pressure irrigation, all solenoid valves are in a power-off state, and the solenoid valves will only be powered during a short period of normal pressure or positive pressure irrigation, which effectively reduces the control energy consumption of the system; a pulley device is used to set the liquid storage tank at both ends of the cable, and the equal lever principle of the pulley device is used to control the weight of the liquid storage tanks at both ends to be consistent, that is, the dead weight of the liquid storage tank can be used to realize the mutual conversion of potential energy, and the electric push rod device can easily change the position height of the liquid storage tanks at both ends of the cable by overcoming the friction resistance of the system, which greatly reduces the energy consumption caused by changing the height of the liquid storage tank; the whole irrigation system has a high degree of intelligence, and the precise supply of water and fertilizer required for vegetable growth has greatly increased the yield, and minimized the consumption of water resources, electricity and human resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the initial position connection of a preferred embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of positive and negative pressure irrigation according to a preferred embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the connection of the irrigation control components of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0037] See also Figure 1~Figure 3The invention discloses an intelligent irrigation control method for integrated water and fertilizer suitable for frame cultivation, which adopts an irrigation control device with alternating positive and negative pressure to implement intelligent irrigation. The intelligent irrigation control method for integrated water and fertilizer suitable for frame cultivation comprises a multi-layer planting frame part A, an irrigation control part B and a lifting control part C, wherein the multi-layer planting frame part A comprises a first layer of clay pipe A1, a second layer of clay pipe A2, a third layer of clay pipe A3, a fourth layer of clay pipe A4, a fifth layer of clay pipe A5, a sixth layer of clay pipe A6, a cultivation matrix A7, a support roller A8, a support frame A9, and vegetables A10; the irrigation control part B comprises a first layer of normally open solenoid valve B1, a second layer of normally open solenoid valve B2, a third layer of normally open solenoid valve B3, a fourth layer of normally open solenoid valve B4, a fifth layer of normally open solenoid valve B5, a sixth layer of normally open solenoid valve B6, a third normally closed solenoid valve B7, and a A normally open solenoid valve B8, a fourth normally closed solenoid valve B9, a first normally closed solenoid valve B10, a second normally closed solenoid valve B11, a first multi-way pipe joint B12, a second multi-way pipe joint B13, a third multi-way pipe joint B14, a fourth multi-way pipe joint B15, a controller B16, a temperature and humidity sensor B17, a water and fertilizer integrated tank B18, a first liquid storage tank B19, a second liquid storage tank B20, a first liquid level sensor B21, a second liquid level sensor B22, and a third liquid level sensor B23. The lifting control part C includes a first pulley device C1, a second pulley device C2, a first anti-slip plate C3, a second anti-slip plate C4, a first support plate C5, a second support plate C6, a first weighing sensor C7, a second weighing sensor C8, a first electric push rod device C9, a second electric push rod device C10, and a cable C11.

[0038] In this embodiment, a support roller A8 is provided at the bottom of the support frame A9 to facilitate the movement of the multi-layer planting frame part A. Six planting layers are provided on the support frame A9, and a cultivation matrix A7 is provided on each planting layer. A first layer of clay tube A1, a second layer of clay tube A2, a third layer of clay tube A3, a fourth layer of clay tube A4, a fifth layer of clay tube A5, and a sixth layer of clay tube A6 are respectively provided in the cultivation matrix A7 of each layer, which are used to transport liquid water, fertilizer and nutrients to the cultivation matrix A7. A humidity sensor B17 is provided on each layer of the cultivation matrix A7, which is used to detect the moisture content and temperature of the cultivation matrix A7 and feed back the data to the controller B16. The vegetables A10 are planted on the cultivation matrix A7 and grow by absorbing the water, fertilizer and nutrients in the cultivation matrix A7.

[0039] In this embodiment, the water-fertilizer nutrient liquid is stored in the water-fertilizer integrated tank B18, a first liquid level sensor B21 is provided in the water-fertilizer integrated tank B18, the outlet of the water-fertilizer integrated tank B18 is connected to the inlet of the first multi-way pipe joint B12 through a liquid infusion pipeline, the inlets of the first normally closed solenoid valve B10 and the second normally closed solenoid valve B11 are respectively connected to the outlet of the first multi-way pipe joint B12 through a liquid infusion pipeline, the outlet of the first normally closed solenoid valve B10 is connected to the inlet of the first liquid storage tank B19 through a liquid infusion pipeline, and the outlet of the second normally closed solenoid valve B11 is connected to the inlet of the second liquid storage tank B20 through a liquid infusion pipeline. The outlet of the first liquid storage tank B19 is connected to the inlet of the second multi-way pipe joint B13 through an infusion pipeline, the inlets of the four-layer normally open solenoid valve B4, the five-layer normally open solenoid valve B5, the six-layer normally open solenoid valve B6, and the third normally closed solenoid valve B7 are respectively connected to the outlet of the second multi-way pipe joint B13 through an infusion pipeline, the outlet of the four-layer normally open solenoid valve B4 is connected to the four-layer clay pipe A4 through an infusion pipeline, the outlet of the five-layer normally open solenoid valve B5 is connected to the five-layer clay pipe A5 through an infusion pipeline, the outlet of the six-layer normally open solenoid valve B6 is connected to the six-layer clay pipe A6 through an infusion pipeline, and the outlet of the third normally closed solenoid valve B7 is connected to the six-layer clay pipe A7 through an infusion pipeline. The outlet of the magnetic valve B7 is connected to the inlet of the third multi-way pipe joint B14 through an infusion pipeline, the inlets of the first-layer normally open solenoid valve B1, the second-layer normally open solenoid valve B2, and the third-layer normally open solenoid valve B3 are respectively connected to the outlet of the third multi-way pipe joint B14 through an infusion pipeline, the outlet of the first-layer normally open solenoid valve B1 is connected to the first-layer clay pipe A1 through an infusion pipeline, the outlet of the second-layer normally open solenoid valve B2 is connected to the second-layer clay pipe A2 through an infusion pipeline, the outlet of the third-layer normally open solenoid valve B3 is connected to the third-layer clay pipe A3 through an infusion pipeline, the inlets of the first normally open solenoid valve B8 and the fourth normally closed solenoid valve B9 are connected to the outlet of the third multi-way pipe joint B14 through an infusion pipeline, the outlet of the first-layer normally open solenoid valve B1 is connected to the first-layer clay pipe A1 through an infusion pipeline, the outlet of the second-layer normally open solenoid valve B2 is connected to the second-layer clay pipe A2 through an infusion pipeline, the outlet of the third-layer normally open solenoid valve B3 is connected to the third-layer clay pipe A3 through an infusion pipeline, the outlets of the first normally open solenoid valve B8 and the fourth normally closed solenoid valve B9 are connected to the outlet of the third multi-way pipe joint B14 through an infusion pipeline, and the outlet of the first normally open solenoid valve B1 is connected to the first-layer clay pipe A1 through an infusion pipeline. The outlets of the second liquid storage tank B20 are respectively connected through infusion pipes, the outlet of the fourth normally closed solenoid valve B9 is connected to the inlet of the second multi-way pipe joint B13 through an infusion pipe, the outlet of the first normally open solenoid valve B8 is connected to the inlet of the fourth multi-way pipe joint B15 through an infusion pipe, and the outlet of the fourth multi-way pipe joint B15 is respectively connected to the inlets of the first-layer normally open solenoid valve B1, the second-layer normally open solenoid valve B2, and the third-layer normally open solenoid valve B3 through an infusion pipe. A second liquid level sensor B22 is arranged in the first liquid storage tank B19, and a third liquid level sensor B23 is arranged in the second liquid storage tank B20.

[0040] In this embodiment, the first pulley device C1 and the second pulley device C2 are respectively arranged on the beams in the vegetable greenhouse, and the rotation centers of the pulleys are in the same horizontal plane. The cable C11 passes through the first pulley device C1 and the second pulley device C2 at the same time. One end of the cable C11 is fixedly connected to the first liquid storage tank B19, and the other end of the cable C11 is fixedly connected to the second liquid storage tank B20. A first anti-slip plate C3 is arranged at the end of the cable C11 close to the second liquid storage tank B20, and a second anti-slip plate C4 is arranged at the end of the cable C11 close to the first liquid storage tank B19. The first anti-slip plate C3 and the second anti-slip plate C4 are used to limit the cable C11 from pulling the first liquid storage tank B19 and the second liquid storage tank B2 0 relative position of up and down movement, a second electric push rod device C10 is arranged at the lower end of the first liquid storage tank B19, and the second electric push rod device C10 is used for supporting and limiting the first liquid storage tank B19, a second support plate C6 is arranged at the top end of the second electric push rod device C10, and a second weighing sensor C8 is arranged between the second support plate C6 and the first liquid storage tank B19, a first electric push rod device C9 is arranged at the lower end of the second liquid storage tank B20, and the first electric push rod device C9 is used for supporting and limiting the second liquid storage tank B20, a first support plate C5 is arranged at the top end of the first electric push rod device C9, and a first weighing sensor C7 is arranged between the first support plate C5 and the second liquid storage tank B20.

[0041] In this embodiment, the first layer normally open solenoid valve B1, the second layer normally open solenoid valve B2, the third layer normally open solenoid valve B3, the fourth layer normally open solenoid valve B4, the fifth layer normally open solenoid valve B5, the sixth layer normally open solenoid valve B6, and the first normally open solenoid valve B8 are normally open when power is off, and power off is normal; the third normally closed solenoid valve B7, the fourth normally closed solenoid valve B9, the first normally closed solenoid valve B10, and the second normally closed solenoid valve B11 are normally closed when power is off, and power off is normal; the position of the integrated water and fertilizer tank B18 is higher than the highest position that the first liquid storage tank B19 and the second liquid storage tank B20 can reach; the highest position that the first liquid storage tank B19 and the second liquid storage tank B20 can reach is higher than the upper surface of the cultivation matrix A7 where the six-layer clay pipe A6 is located. The controller B16 receives the detection data of the temperature and humidity sensor B17, the first weighing sensor C7, the second weighing sensor C8, the liquid level sensor B21, the second liquid level sensor B22, and the third liquid level sensor B23 in real time. The controller B16 can control the power on and off of each solenoid valve. The controller B16 can control the lifting and lowering of the first electric push rod device C9 and the second electric push rod device C10. The one-layer clay tube A1 is located at the bottom layer of the support frame A9, and the six-layer clay tube A6 is located at the top layer of the support frame A9. The one-layer clay tube A1 to the six-layer clay tube A6 are arranged in sequence from low to high. The initial height of the first liquid storage tank B19 is between the third and fourth layers, and the initial height of the second liquid storage tank B20 is lower than the first layer.

[0042] In this embodiment, the second electric push rod device C10 pushes the first liquid storage tank B19, and the first electric push rod device C9 pushes the second liquid storage tank B20 to the initial height, and keeps the cable C11 in a tensioned state. The controller B16 controls the first normally closed solenoid valve B10 and the second normally closed solenoid valve B11 to be powered on and opened, and the water, fertilizer and nutrient liquid in the water-fertilizer integrated tank B18 are respectively injected into the first liquid storage tank B19 and the second liquid storage tank B20 through the liquid infusion pipeline. When the second liquid level sensor B22 and the third liquid level sensor B23 respectively detect the liquid level value to the set value, the controller B16 controls the first normally closed solenoid valve B10 and the second normally closed solenoid valve B11 to be powered off and closed, and stops delivering water, fertilizer and nutrient to the first liquid storage tank B19 and the second liquid storage tank B20. At this time, the first layer normally open solenoid valve B1, the second layer normally open solenoid valve B2, the third layer normally open solenoid valve B3, the fourth layer normally open solenoid valve B4, the fifth layer normally open solenoid valve B5, the sixth layer normally open solenoid valve B6, and the first normally open solenoid valve B8 are in the normally open state without power, the third normally closed solenoid valve B7, the fourth normally closed solenoid valve B9, the first normally closed solenoid valve B10, and the second normally closed solenoid valve B11 are in the normally closed state without power, and the water, fertilizer and nutrient liquid in the first liquid storage tank B19 is respectively delivered to the fourth layer clay pipe A4, the fifth layer clay pipe A5, and the sixth layer clay pipe A6 through negative pressure irrigation, and the water, fertilizer and nutrient liquid in the second liquid storage tank B20 is respectively delivered to the first layer clay pipe A1, the second layer clay pipe A2, and the third layer clay pipe A3 through negative pressure irrigation. When the first liquid storage tank When the second liquid level sensor B22 in the tank B19 detects that the liquid level is lower than the set value, the controller B16 controls the first normally closed solenoid valve B10 to be energized and opened, and the first liquid storage tank B19 is injected with liquid. When the liquid level returns to the set value, the controller B16 controls the first normally closed solenoid valve B10 to be de-energized and closed, and the injection of liquid into the first liquid storage tank B19 is stopped. This cycle is repeated. When the third liquid level sensor B23 in the second liquid storage tank B20 detects that the liquid level is lower than the set value, the controller B16 controls the second normally closed solenoid valve B11 to be energized and opened, and the second liquid storage tank B20 is injected with liquid. When the liquid level returns to the set value, the controller B16 controls the second normally closed solenoid valve B11 to be de-energized and closed, and the injection of liquid into the second liquid storage tank B20 is stopped. This cycle is repeated. When the first liquid level sensor B21 in the water-fertilizer integrated tank B18 detects that the liquid level is lower than the set value, the controller B16 sounds an alarm to prompt the staff to add water, fertilizer and nutrients in time. With the growth of vegetable A10 and changes in climate, negative pressure irrigation cannot meet the growth needs of vegetable A10. When the humidity of the cultivation matrix A7 is lower than the set lower limit, the controller B16 controls the switch of the solenoid valve and the height of the liquid storage tank to perform normal pressure or positive pressure irrigation. The first liquid storage tank B19 and the second liquid storage tank B20 can perform negative pressure, normal pressure or positive pressure irrigation on the first, second, third, fourth, fifth and sixth layers respectively. The first liquid storage tank B19 can perform negative pressure irrigation on the fourth, fifth and sixth layers while performing normal pressure or positive pressure irrigation on the first, second and third layers.The second liquid storage tank B20 can perform negative pressure irrigation on the fourth, fifth and sixth layers while performing normal pressure or positive pressure irrigation on the first, second and third layers. The first liquid storage tank B19 and the second liquid storage tank B20 can be used alternately. The specific control steps are as follows:

[0043] 1. The second liquid storage tank B20 is used for normal pressure or positive pressure irrigation of the first, second and third floors

[0044] When the humidity of the first, second and third layers of the cultivation substrate A7 is lower than the set lower limit, the first electric push rod device C9 pushes the second liquid storage tank

[0045] B20 is used for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only carried out on the first floor or on the first and second floors at the same time, the controller B16 does not need to issue instructions to the normally open solenoid valve B1 on the first floor or on the normally open solenoid valve B1 on the first floor and the normally open solenoid valve B2 on the second floor. The normally open solenoid valve B1 on the first floor, the normally open solenoid valve B2 on the second floor, and the normally open solenoid valve B3 on the third floor are all in the normally open state without power. If normal pressure or positive pressure irrigation is only carried out on the third floor or on the second and third floors at the same time, the controller B1 6 respectively control the normally open solenoid valve B1 of the first layer and the normally open solenoid valve B2 of the second layer, or only control the normally open solenoid valve B1 of the first layer, that is, when only the third layer is irrigated with normal pressure or positive pressure, the normally open solenoid valve B1 of the first layer and the normally open solenoid valve B2 of the second layer are in the energized closed state, and when the second and third layers are irrigated with normal pressure or positive pressure, the normally open solenoid valve B1 of the first layer is in the energized closed state. In this process, the third normally closed solenoid valve B7 and the fourth normally closed solenoid valve B9 are both in the de-energized closed state;

[0046] 2. The first liquid storage tank B19 is used for normal pressure or positive pressure irrigation of the four-layer, five-layer and six-layer

[0047] When the humidity of the fourth, fifth, and sixth layers of the cultivation substrate A7 is lower than the set lower limit, the second electric push rod device C10 pushes the first liquid storage tank B19 upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the fourth layer or on the fourth and fifth layers at the same time, the controller B16 does not need to issue instructions to the fourth-layer normally open solenoid valve B4 or on the fourth-layer normally open solenoid valve B4 and the fifth-layer normally open solenoid valve B5 at the same time. The fourth-layer normally open solenoid valve B4, the fifth-layer normally open solenoid valve B5, and the sixth-layer normally open solenoid valve B6 are all in the power-off normally open state. If only the sixth layer or the fifth layer is irrigated at the same time, the controller B16 does not need to issue instructions to the fourth-layer normally open solenoid valve B4 or on the fourth-layer normally open solenoid valve B4 and the fifth-layer normally open solenoid valve B5 at the same time. When the fifth and sixth floors are irrigated at normal pressure or positive pressure, the controller B16 respectively commands the fourth-layer normally open solenoid valve B4 and the fifth-layer normally open solenoid valve B5, or the fourth-layer normally open solenoid valve B4 alone, that is, when only the sixth floor is irrigated at normal pressure or positive pressure, the fourth-layer normally open solenoid valve B4 and the fifth-layer normally open solenoid valve B5 are in the energized closed state, and when the fifth and sixth floors are irrigated at normal pressure or positive pressure, the fourth-layer normally open solenoid valve B4 is in the energized closed state. During this process, the third normally closed solenoid valve B7 and the fourth normally closed solenoid valve B9 are both in the de-energized closed state.

[0048] 3. The second liquid storage tank B20 is used for normal pressure or positive pressure irrigation of four, five and six layers

[0049] When the humidity of the fourth, fifth, and sixth layers of the cultivation substrate A7 is lower than the set lower limit, the first electric push rod device C9 pushes the second liquid storage tank B20 upward for normal pressure or positive pressure irrigation. If only the fourth layer or the fourth and fifth layers are irrigated at normal pressure or positive pressure, the controller B16 does not need to issue instructions to the fourth-layer normally open solenoid valve B4 or the fourth-layer normally open solenoid valve B4 and the fifth-layer normally open solenoid valve B5 at the same time. The fourth-layer normally open solenoid valve B4, the fifth-layer normally open solenoid valve B5, and the sixth-layer normally open solenoid valve B6 are all in the power-off normally open state. If only the sixth layer or the fifth and sixth layers are irrigated at normal pressure or positive pressure, the controller B16 does not need to issue instructions to the fourth-layer normally open solenoid valve B4 or the fourth-layer normally open solenoid valve B4 and the fifth-layer normally open solenoid valve B5 at the same time. During normal pressure irrigation, the controller B16 respectively commands and controls the four-layer normally open solenoid valve B4 and the five-layer normally open solenoid valve B5, or the four-layer normally open solenoid valve B4 alone, that is, when only the six-layer is irrigated with normal pressure or positive pressure, the four-layer normally open solenoid valve B4 and the five-layer normally open solenoid valve B5 are in the energized closed state, and when the five and six layers are irrigated with normal pressure or positive pressure, the four-layer normally open solenoid valve B4 is in the energized closed state. During this process, the third normally closed solenoid valve B7 is in the de-energized closed state, the fourth normally closed solenoid valve B9 is in the energized open state, and the first normally open solenoid valve B8 is in the energized closed state.

[0050] 4. The first liquid storage tank B19 is used for normal pressure or positive pressure irrigation of the first, second and third floors

[0051] When the humidity of the first, second, and third layers of the cultivation substrate A7 is lower than the set lower limit, the second electric push rod device C10 pushes the first liquid storage tank B19 upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is performed on only one layer or on both layers at the same time, the controller B16 does not need to issue instructions to the normally open solenoid valve B1 on the first layer or on both the normally open solenoid valve B1 on the first layer and the normally open solenoid valve B2 on the second layer. The normally open solenoid valve B1 on the first layer, the normally open solenoid valve B2 on the second layer, and the normally open solenoid valve B3 on the third layer are all in the power-off normally open state. If normal pressure or positive pressure irrigation is performed on only three layers or on both layers at the same time, the controller B16 does not need to issue instructions to the normally open solenoid valve B1 on the first layer or on both the normally open solenoid valve B1 on the first layer and the normally open solenoid valve B2 on the second layer. During positive pressure irrigation, the controller B16 respectively commands and controls the normally open solenoid valve B1 on the first layer and the normally open solenoid valve B2 on the second layer, or only commands and controls the normally open solenoid valve B1 on the first layer, that is, when only the third layer is irrigated with normal pressure or positive pressure, the normally open solenoid valve B1 on the first layer and the normally open solenoid valve B2 on the second layer are in an energized closed state, and when the second and third layers are irrigated with normal pressure or positive pressure, the normally open solenoid valve B1 on the first layer is in an energized closed state. During this process, the third normally closed solenoid valve B7 is in an energized open state, the fourth normally closed solenoid valve B9 is in a de-energized closed state, and the first normally open solenoid valve B8 is in an energized closed state.

[0052] 5. The first liquid storage tank B19 is used for normal pressure or positive pressure irrigation of the first, second, third, fourth, fifth and sixth floors.

[0053] When the humidity of the first, second, third, fourth, fifth and sixth layers of the cultivation substrate A7 is lower than the set lower limit, the second electric push rod device C10 pushes the first liquid storage tank B19 upward for normal pressure or positive pressure irrigation. During this process, the fourth normally closed solenoid valve B9 is in a power-off closed state, the first normally open solenoid valve B8 is in a power-on closed state, the third normally closed solenoid valve B7 is in a power-on open state, the first layer normally open solenoid valve B1, the second layer normally open solenoid valve B2, the third layer normally open solenoid valve B3, the fourth layer normally open solenoid valve B4, the fifth layer normally open solenoid valve B5 and the sixth layer normally open solenoid valve B6 are all in a power-off normally open state;

[0054] When each layer is irrigated at normal pressure or positive pressure, when the humidity of the cultivation matrix A7 of the corresponding layer reaches the set median value, the solenoid valve of the corresponding layer can be closed. For the selection of various normal pressure and positive pressure irrigation methods, the controller B16 optimizes and analyzes the feedback data of the temperature and humidity sensors B17, the second liquid level sensor B22, the third liquid level sensor B23, the first weighing sensor C7, and the second weighing sensor C8 of each layer, and then outputs a control instruction for normal pressure or positive pressure irrigation. When the humidity of the cultivation matrix A7 of each layer reaches the set median value, the controller B16 issues an instruction to restore the first liquid storage tank B19 and the second liquid storage tank B20 to the initial height, and all solenoid valves also return to normal. At this point, the irrigation system returns to the negative pressure irrigation state.

[0055] In this embodiment, negative pressure, normal pressure or positive pressure irrigation requires adjusting the height of the first liquid storage tank B19 and the second liquid storage tank B20. When the weight of the first liquid storage tank B19 is greater than the weight of the second liquid storage tank B20, the feedback value of the second weighing sensor C8 is greater than the feedback value of the first weighing sensor C7. At this time, the controller B16 gives an instruction according to the feedback difference between the two, so that the second normally closed solenoid valve B11 is powered on and opened to inject liquid into the second liquid storage tank B20 until the weight of the second liquid storage tank B20 is consistent with the weight of the first liquid storage tank B19. The controller B16 issues an instruction to de-energize the second normally closed solenoid valve B11 and close to stop injecting liquid into the second liquid storage tank B20. At this time, the controller B16 issues an instruction to control the operation of the first electric push rod device C9 and the second electric push rod device C10. If the first electric push rod device C9 goes down, the second electric push rod device C10 goes up. If the first electric push rod device C9 goes up, the second electric push rod device C10 goes down, and the strokes of the two are equal.

[0056] On the contrary, if the weight of the second liquid storage tank B20 is greater than the weight of the first liquid storage tank B19, the controller B16 gives an instruction to enable the first normally closed solenoid valve B10 to be powered on and open to inject liquid into the first liquid storage tank B19, until the weight of the first liquid storage tank B19 is consistent with the weight of the second liquid storage tank B20, and the controller B16 gives an instruction to enable the first normally closed solenoid valve B10 to be powered off and closed to stop injecting liquid into the first liquid storage tank B19;

[0057] As irrigation proceeds, the nutrients in the first liquid storage tank B19 and the second liquid storage tank B20 will be consumed. When the weights of the two are inconsistent and up and down movements are required, the nutrients are supplemented according to the above control method, and the up and down movements are controlled again after the weights are consistent;

[0058] When the second liquid level sensor B22 and the third liquid level sensor B23 respectively detect that the nutrient storage amount in the first liquid storage tank B19 and the second liquid storage tank B20 is small, the first normally closed solenoid valve B10 and the second normally closed solenoid valve B11 can be opened simultaneously to inject liquid therein respectively. When one of the liquid level sensors detects that the capacity in the liquid storage tank has reached the upper limit value, the corresponding solenoid valve is closed first to stop the injection. When the feedback values ​​of the two weighing sensors are consistent, the other solenoid valve is closed to stop the injection.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A water-fertilizer integrated intelligent irrigation control method suitable for rack cultivation, comprising a multi-layer planting rack part, an irrigation control part and a lifting control part, wherein: The multi-layer planting rack part includes a support frame, a cultivation matrix, and a clay pipe. The irrigation control part includes a water-fertilizer integrated tank, a liquid storage tank, a temperature and humidity sensor, a controller, a multi-way pipe joint, a liquid level sensor, and a normally open and normally closed solenoid valve. The water-fertilizer integrated tank, the liquid storage tank, the solenoid valve, the multi-way pipe joint, and the clay pipe are connected by a liquid infusion pipeline. The controller receives signals from the temperature and humidity sensor and the liquid level sensor and controls the power on and off of the normally open and normally closed solenoid valves. The lifting control part includes a pulley device, an anti-slip plate, a support plate, a weighing sensor, and an electric A push rod device, a cable, the cable passes through a pulley device, and liquid storage tanks are respectively arranged at both ends of the cable. The invention is characterized in that a cultivation matrix is ​​arranged on the support frame, a clay tube is arranged in the cultivation matrix, and the outlet of the water-fertilizer integrated tank is connected to the inlet of the first normally closed solenoid valve and the second normally closed solenoid valve through a first multi-way pipe joint, respectively. The outlet of the first normally closed solenoid valve is connected to the inlet of the first liquid storage tank, the outlet of the second normally closed solenoid valve is connected to the inlet of the second liquid storage tank, the outlet of the first liquid storage tank is connected to the inlet of the second multi-way pipe joint, and the four-layer normally open solenoid valve is connected to the inlet of the second liquid storage tank. The inlets of the first layer of normally open solenoid valve, the second layer of normally open solenoid valve, and the third layer of normally closed solenoid valve are respectively connected to the outlet of the second multi-way pipe joint, the outlet of the fourth layer of normally open solenoid valve is connected to the fourth layer of clay pipe, the outlet of the fifth layer of normally open solenoid valve is connected to the fifth layer of clay pipe, the outlet of the sixth layer of normally open solenoid valve is connected to the sixth layer of clay pipe, the outlet of the third normally closed solenoid valve is connected to the inlet of the third multi-way pipe joint, the inlets of the first layer of normally open solenoid valve, the second layer of normally open solenoid valve, and the third layer of normally open solenoid valve are respectively connected to the outlet of the third multi-way pipe joint, and the outlet of the first layer of normally open solenoid valve is connected to the outlet of the third multi-way pipe joint. The outlet of the valve is connected to a layer of clay pipe, the outlet of the second layer of normally open solenoid valve is connected to the second layer of clay pipe, the outlet of the third layer of normally open solenoid valve is connected to the third layer of clay pipe, the inlets of the first normally open solenoid valve and the fourth normally closed solenoid valve are respectively connected to the outlet of the second liquid storage tank, the outlet of the fourth normally closed solenoid valve is connected to the inlet of the second multi-way pipe joint, the outlet of the first normally open solenoid valve is connected to the inlet of the fourth multi-way pipe joint, and the outlet of the fourth multi-way pipe joint is respectively connected to the inlets of the first layer of normally open solenoid valve, the second layer of normally open solenoid valve, and the third layer of normally open solenoid valve; The second electric push rod device pushes the first liquid storage tank, and the first electric push rod device pushes the second liquid storage tank to the initial height, keeping the cable in a tensioned state. The controller controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered on and opened, respectively, and the water, fertilizer and nutrient liquid in the water-fertilizer integrated tank is injected into the first liquid storage tank and the second liquid storage tank respectively. When the second liquid level sensor and the third liquid level sensor respectively detect that the liquid level value reaches the set value, the controller controls the first normally closed solenoid valve and the second normally closed solenoid valve to be powered off and closed respectively, and stops delivering water, fertilizer and nutrient liquid to the first liquid storage tank and the second liquid storage tank, completing the first liquid injection. During this process, each normally open solenoid valve is in a power-off normally open state, and each normally closed solenoid valve is in a power-off normally closed state. The water, fertilizer and nutrient in the first liquid storage tank are respectively delivered to the four-layer clay pipe, the five-layer clay pipe, and the six-layer clay pipe in the form of negative pressure irrigation, and the water, fertilizer and nutrient in the second liquid storage tank are respectively delivered to the one-layer clay pipe, the two-layer clay pipe, and the three-layer clay pipe in the form of negative pressure irrigation. When the second liquid level sensor in the first liquid storage tank detects that the liquid When the liquid level is lower than the set value, the controller controls the first normally closed solenoid valve to be energized and opened, and the first liquid storage tank is filled with liquid. When the liquid level returns to the set value, the controller controls the first normally closed solenoid valve to be de-energized and closed, and the first liquid storage tank is stopped from being filled with liquid. When the third liquid level sensor in the second liquid storage tank detects that the liquid level is lower than the set value, the controller controls the second normally closed solenoid valve to be energized and opened, and the second liquid storage tank is filled with liquid. When the liquid level returns to the set value, the controller controls the second normally closed solenoid valve to be de-energized and closed, and the second liquid storage tank is stopped from being filled with liquid. When the first liquid level sensor in the water-fertilizer integrated tank detects that the liquid level is lower than the set value, the controller issues an alarm to prompt the staff to add water, fertilizer and nutrients in time. When the humidity of the cultivation substrate is lower than the set lower limit, the controller controls the switch of the solenoid valve and the height of the liquid storage tank to perform normal pressure or positive pressure irrigation. When the normal pressure or positive pressure irrigation reaches the set median value of the humidity of the cultivation substrate, the controller switches the irrigation mode to negative pressure or pause state by controlling the switch of the solenoid valve and the height of the liquid storage tank, and so on. The first liquid storage tank and the second liquid storage tank can perform negative pressure, normal pressure or positive pressure irrigation on the first, second, third, fourth, fifth and sixth floors respectively; the first liquid storage tank can perform normal pressure or positive pressure irrigation on the first, second and third floors while performing negative pressure irrigation on the fourth, fifth and sixth floors; the second liquid storage tank can perform negative pressure irrigation on the fourth, fifth and sixth floors while performing normal pressure or positive pressure irrigation on the first, second and third floors; the first liquid storage tank and the second liquid storage tank can be used alternately.

2. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: When the humidity of the first, second and third layers of the cultivation substrate is lower than the set lower limit, the first electric push rod device pushes the second liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is performed on only one layer or on both layers at the same time, the controller does not need to perform command control on the first layer normally open solenoid valve or on both layers at the same time. The first layer normally open solenoid valve, the second layer normally open solenoid valve and the third layer normally open solenoid valve are all in a power-off normally open state. If normal pressure or positive pressure irrigation is performed on only three layers or on both layers at the same time, the controller respectively performs command control on the first layer normally open solenoid valve, the second layer normally open solenoid valve or on the first layer normally open solenoid valve alone. When normal pressure or positive pressure irrigation is performed on only three layers, the first layer normally open solenoid valve and the second layer normally open solenoid valve are in a powered closed state. When normal pressure or positive pressure irrigation is performed on the second and third layers, the first layer normally open solenoid valve is in a powered closed state. During this process, the third normally closed solenoid valve and the fourth normally closed solenoid valve are both in a power-off closed state. When the humidity of the cultivation substrate on the fourth, fifth, and sixth layers is lower than the set lower limit, the second electric push rod device pushes the first liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the fourth layer or on the fourth and fifth layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the fourth layer or on the normally open solenoid valve on the fourth layer and the normally open solenoid valve on the fifth layer at the same time. The normally open solenoid valve on the fourth layer, the normally open solenoid valve on the fifth layer, and the normally open solenoid valve on the sixth layer are all in the normally open state without power. If only the sixth layer or the fifth layer is irrigated at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the fourth layer or on the normally open solenoid valve on the fourth layer and the normally open solenoid valve on the fifth layer at the same time. When the fifth and sixth floors are irrigated at normal pressure or positive pressure, the controller commands and controls the normally open solenoid valve on the fourth floor, the normally open solenoid valve on the fifth floor, or the normally open solenoid valve on the fourth floor alone. When only the sixth floor is irrigated at normal pressure or positive pressure, the normally open solenoid valve on the fourth floor and the normally open solenoid valve on the fifth floor are in an energized closed state. When the fifth and sixth floors are irrigated at normal pressure or positive pressure, the normally open solenoid valve on the fourth floor is in an energized closed state. During this process, the third normally closed solenoid valve and the fourth normally closed solenoid valve are both in a de-energized closed state. When the humidity of the cultivation substrate of the fourth, fifth, and sixth layers is lower than the set lower limit, the first electric push rod device pushes the second liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the fourth layer or on the fourth and fifth layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve of the fourth layer or on the normally open solenoid valve of the fourth layer and the normally open solenoid valve of the fifth layer at the same time. The normally open solenoid valve of the fourth layer, the normally open solenoid valve of the fifth layer, and the normally open solenoid valve of the sixth layer are all in the normally open state without power. If normal pressure or positive pressure irrigation is only performed on the sixth layer or on the fifth and sixth layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve of the fourth layer or on the normally open solenoid valve of the fourth layer and the normally open solenoid valve of the fifth layer. When normal pressure or positive pressure irrigation is performed on the sixth floor, the normally open solenoid valve on the fourth floor and the normally open solenoid valve on the fifth floor are respectively commanded and controlled, and when normal pressure or positive pressure irrigation is performed on the sixth floor only, the normally open solenoid valve on the fourth floor and the normally open solenoid valve on the fifth floor are in an energized closed state. When normal pressure or positive pressure irrigation is performed on the fifth and sixth floors, the normally open solenoid valve on the fourth floor is in an energized closed state. During this process, the third normally closed solenoid valve is in a de-energized closed state, the fourth normally closed solenoid valve is in an energized open state, and the first normally open solenoid valve is in an energized closed state. When the humidity of the first, second, and third layers of the cultivation substrate is lower than the set lower limit, the second electric push rod device pushes the first liquid storage tank upward for normal pressure or positive pressure irrigation. If normal pressure or positive pressure irrigation is only performed on the first layer or on the first and second layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the first layer or on the normally open solenoid valve on the first layer and the normally open solenoid valve on the second layer at the same time. The normally open solenoid valve on the first layer, the normally open solenoid valve on the second layer, and the normally open solenoid valve on the third layer are all in the normally open state without power. If normal pressure or positive pressure irrigation is only performed on the third layer or on the second and third layers at the same time, the controller does not need to issue instructions to the normally open solenoid valve on the first layer or on the normally open solenoid valve on the first layer and the normally open solenoid valve on the second layer. When normal pressure or positive pressure irrigation is performed on the third floor, the normally open solenoid valve on the first floor and the normally open solenoid valve on the second floor are respectively commanded and controlled, and when normal pressure or positive pressure irrigation is performed on the third floor only, the normally open solenoid valve on the first floor and the normally open solenoid valve on the second floor are in an energized closed state, and when normal pressure or positive pressure irrigation is performed on the second and third floors, the normally open solenoid valve on the first floor is in an energized closed state. During this process, the third normally closed solenoid valve is in an energized open state, the fourth normally closed solenoid valve is in a de-energized closed state, and the first normally open solenoid valve is in an energized closed state; When the humidity of the first, second, third, fourth, fifth and sixth layers of the cultivation substrate is lower than the set lower limit, the second electric push rod device pushes the first liquid storage tank upward for normal pressure or positive pressure irrigation. During this process, the fourth normally closed solenoid valve is in a power-off closed state, the first normally open solenoid valve is in a power-on closed state, the third normally closed solenoid valve is in a power-on open state, and the first normally open solenoid valve, the second normally open solenoid valve, the third normally open solenoid valve, the fourth normally open solenoid valve, the fifth normally open solenoid valve and the sixth normally open solenoid valve are all in a power-off normally open state.

3. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: A bracket roller is arranged at the bottom of the support frame, the number of layers of the cultivation substrate is ≥2, the number of liquid storage tanks is ≥2, the number of temperature and humidity sensors on each layer of the cultivation substrate is ≥2, and the number of water-fertilizer integrated irrigation and liquid level sensors in the liquid storage tank is ≥1; the pulley device is arranged on the beam in the vegetable greenhouse, and the rotation center of the pulley is in the same horizontal plane.

4. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: A supporting plate is arranged on the top of the electric push rod device, and a weighing sensor is arranged between the supporting plate and the liquid storage tank.

5. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: Each normally open solenoid valve is in a normally open state when power is lost, and power loss is the normal state. Each normally closed solenoid valve is in a normally closed state when power is lost, and power loss is the normal state.

6. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: Anti-slip plates are respectively arranged at both ends of the cable to limit the relative position of the liquid storage tank when it moves up and down. Electric push rod devices are respectively arranged at the lower ends of the liquid storage tanks. The controller controls the lifting and lowering of the electric push rod devices to support and limit the liquid storage tanks.

7. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: The position of the integrated water-fertilizer tank is higher than the highest position that the liquid storage tank can reach, and the highest position that the liquid storage tank can reach is higher than the upper surface of the cultivation substrate where the six-layer clay tube is located. The one-layer clay tube is located at the bottom layer of the support frame, and the six-layer clay tube is located at the highest layer of the support frame. The one-layer clay tube to the six-layer clay tube are arranged in sequence from low to high. The initial height of the first liquid storage tank is between the third layer and the fourth layer, and the initial height of the second liquid storage tank is lower than the first layer.

8. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: The controller optimizes and analyzes the feedback data from the temperature and humidity sensors on each layer, the second liquid level sensor, the third liquid level sensor, the first weighing sensor, and the second weighing sensor, and then outputs a control instruction for normal pressure or positive pressure irrigation. When the humidity of each layer of the cultivation substrate reaches the set median, the controller issues an instruction to restore the first liquid storage tank and the second liquid storage tank to their initial heights, all solenoid valves return to normal, and the irrigation system returns to the negative pressure irrigation state.

9. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: When the feedback value of the second weighing sensor is greater than the feedback value of the first weighing sensor, the controller gives an instruction according to the feedback difference between the two, controls the second normally closed solenoid valve to be energized and opened, and injects liquid into the second liquid storage tank until the weight of the second liquid storage tank is consistent with the weight of the first liquid storage tank. The controller issues an instruction to de-energize and close the second normally closed solenoid valve to stop injecting liquid into the second liquid storage tank. At this time, the controller issues an instruction to control the operation of the first electric push rod device and the second electric push rod device. If the first electric push rod device moves downward, the second electric push rod device moves upward. If the first electric push rod device moves upward, the second electric push rod device moves downward, and the strokes of the two are equal. On the contrary, if the weight of the second liquid storage tank is greater than the weight of the first liquid storage tank, the controller gives an instruction to the first normally closed solenoid valve to be energized and opened to fill the first liquid storage tank with liquid until the weight of the first liquid storage tank is consistent with the weight of the second liquid storage tank. The controller then sends an instruction to the first normally closed solenoid valve to be de-energized and closed to stop filling the first liquid storage tank with liquid.

10. The water-fertilizer integrated intelligent irrigation control method suitable for frame cultivation according to claim 1, characterized in that: When the second liquid level sensor and the third liquid level sensor respectively detect that the nutrient storage amount in the first liquid storage tank and the second liquid storage tank is small, the first normally closed solenoid valve and the second normally closed solenoid valve can be opened simultaneously to inject liquid therein respectively. When one of the liquid level sensors detects that the capacity in the liquid storage tank reaches the upper limit value, the corresponding solenoid valve is closed first to stop the injection. When the feedback values ​​of the two weighing sensors are consistent, the other solenoid valve is closed to stop the injection.

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