Leaf vegetable water planting device capable of recycling nutrient solution

Abstract

The utility model discloses a leafy vegetable hydroponic device capable of recycling nutrient solution. The leafy vegetable hydroponic device comprises a bearing frame, a nutrient solution blending box, a plurality of groups of hydroponic boxes, a plurality of nutrient solution buffer disinfection pools, a nutrient solution regulation and control component and a control system. Wherein the bearing frame is provided with a plurality of partition plates in parallel, the space of the bearing frame is divided into a plurality of placing layers at different heights, and the nutrient solution blending box, the plurality of groups of water culture boxes, the plurality of nutrient solution buffering and disinfecting pools and the nutrient solution regulating and controlling component are respectively arranged in the plurality of placing layers of the bearing frame; the nutrient solution blending box is located below the multiple groups of water culture boxes, the multiple groups of water culture boxes are located below the nutrient solution regulation and control component, all the groups of water culture boxes are located on placement layers at different heights, and a layer of nutrient solution buffer disinfection pool is arranged between every two adjacent groups of water culture boxes. The nutrient solution in the device can be recycled and disinfected, and the nutrient solution can be adjusted according to the concentration, pH change and liquid level change of the nutrient solution conveyed into the circulating system.

Description

Technical Field

[0001] The utility model relates to a hydroponic device, in particular to a leafy vegetable hydroponic device with nutrient solution recycling. Background Art

[0002] With the advancement of science and technology, agricultural technology continues to improve. Small-scale soilless cultivation technology has become an indispensable technology in current agricultural production, especially in home gardening. Traditional home gardening, which mostly uses potted plants or small box cultivation, has high technical requirements and cumbersome operation methods, and no longer meets people's basic needs for home gardening. Green, clean, healthy, and easy-to-use home soilless cultivation equipment is increasingly popular.

[0003] Currently, common types of soilless cultivation of leafy vegetables at home mainly include basic types such as box-type hydroponics, pipe-type hydroponics, and three-dimensional planting. However, almost all of them are set up to plant only one type of leafy vegetable at the same time, and the nutrient solution is mostly supplied once. After planting, the nutrient solution is directly discharged into the environment, which greatly reduces the nutrient utilization rate and causes waste of nutrient solution. The salt content of the discharged waste liquid exceeds the standard, posing a hidden danger to the soil environment. The efficient use of nutrient solution is one of the keys to the development of soilless cultivation technology. The existing nutrient solution efficient utilization system is generally slightly effective in large-scale applications such as greenhouses or plant factories, and it is difficult to effectively apply it in small, limited spaces.

[0004] Although there are also hydroponic practices using nutrient solution circulation, such as Chinese patent CN201710097431.8, which discloses a hydroponic device comprising a frame, a water pool and a nutrient solution pool disposed at the bottom of the frame, a circulation pump, a rehydration pump, several layers of planting troughs disposed on the frame, at least one planting plate disposed on each layer of planting troughs, and plant lights disposed above each layer of planting troughs. The rehydration pump is used to deliver the nutrient solution to the water pool, and the circulation pump is used to deliver a mixture of nutrient solution and water to each layer of planting troughs. During operation, under the action of the circulation pump, the mixed solution is pumped out of the water pool and transported through the water inlet pipe to each layer of planting troughs to provide nutrients to the vegetables fixed in the planting cups. The mixed solution in each layer of planting troughs is further returned to the water pool through the return pipe, thus forming a cycle. Although this patent can also realize nutrient solution circulation, it can only pump the nutrient solution to each layer, and the nutrient solution finally flowing out of the planting trough flows directly into the pool without any treatment. The composition of the nutrient solution will change after planting. Directly discharging it into the pool and then circulating it will cause changes in the concentration of the nutrient solution, and there may even be bacteria, which will lead to contamination of the nutrient solution and is not conducive to plant growth. Utility Model Content

[0005] The purpose of the utility model is to provide a household leafy vegetable hydroponic device that recycles nutrient solution, which solves the problem of pollution during the circulation process of existing hydroponic devices. The nutrient solution in the device can be recycled and disinfected, and the nutrient solution can be adjusted according to the concentration and pH changes of the nutrient solution delivered to the circulation system to meet the growth needs of plants.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a leafy vegetable hydroponic device with nutrient solution recycling, which comprises: a load-bearing frame, a nutrient solution mixing box, several groups of hydroponic boxes, several nutrient solution buffering and disinfection pools, a nutrient solution regulating component and a control system.

[0007] Among them, the load-bearing frame is provided with several partition plates in parallel, dividing the space of the load-bearing frame into several placement layers at different heights, and the nutrient solution mixing box, several groups of hydroponic boxes, several nutrient solution buffer disinfection tanks and nutrient solution control components are respectively arranged in several placement layers of the load-bearing frame, and the nutrient solution mixing box is located below the several groups of hydroponic boxes, and the several groups of hydroponic boxes are located below the nutrient solution control components, and each group of hydroponic boxes is located in a placement layer at a different height.

[0008] The body of the nutrient solution mixing box is provided with a concentrated nutrient solution inlet, an acid solution inlet, an alkali solution inlet, a clean water inlet, a first nutrient solution inlet and a first nutrient solution outlet; the nutrient solution regulating component includes: a concentrated nutrient solution barrel, an acid solution barrel, an alkali solution barrel and a clean water barrel; the hydroponic box in each group is provided with a second nutrient solution inlet and a second nutrient solution outlet, and each nutrient solution buffer disinfection tank is provided with a third nutrient solution inlet and a third nutrient solution outlet.

[0009] Among them, the concentrated nutrient solution inlet of the nutrient solution mixing box is connected to the concentrated nutrient solution barrel, and a solenoid valve 1 is provided on the pipeline between the nutrient solution mixing box and the concentrated nutrient solution barrel; the acid liquid inlet of the nutrient solution mixing box is connected to the acid liquid barrel, and a solenoid valve 2 is provided on the pipeline connecting the nutrient solution mixing box and the acid liquid barrel; the alkali liquid inlet of the nutrient solution mixing box is connected to the alkali liquid barrel, and a solenoid valve 3 is provided on the pipeline connecting the nutrient solution mixing box and the alkali liquid barrel; the clean water inlet of the nutrient solution mixing box is connected to the clean water barrel, and a solenoid valve 4 is provided on the pipeline connecting the nutrient solution mixing box and the clean water barrel; the solenoid valve 1, solenoid valve 2, solenoid valve 3 and solenoid valve 4 are all connected to the control system through a bus.

[0010] The first nutrient solution outlet of the nutrient solution mixing box is connected to the second nutrient solution inlet of the group of hydroponic boxes at the highest point among several groups of hydroponic boxes, and the first nutrient solution inlet of the nutrient solution mixing box is connected to the second nutrient solution outlet of the group of hydroponic boxes at the lowest point among several groups of hydroponic boxes, forming a circulation pipeline for the nutrient solution. The nutrient solution buffer disinfection tank is arranged in the circulation pipeline for disinfecting the nutrient solution.

[0011] A water pump, a pH sensor and an EC sensor are provided inside the nutrient solution mixing box; the control system is connected to the water pump, the pH sensor and the EC sensor via a bus; the water pump is used to pump the nutrient solution in the nutrient solution mixing box into the hydroponic box; the pH sensor is used to monitor the acidity and alkalinity of the nutrient solution in the nutrient solution mixing box in real time; and the EC sensor is used to monitor the concentration of the nutrient solution in the nutrient solution mixing box in real time.

[0012] Preferably, the nutrient solution mixing box is also provided with a liquid level sensor and an oxygenation pump; the control system is connected to the liquid level sensor and the oxygenation pump via a bus, the liquid level sensor is used to monitor the nutrient solution level in the nutrient solution mixing box in real time, and the oxygenation pump is used to increase the oxygen content in the nutrient solution and stir the nutrient solution.

[0013] Preferably, a solenoid valve five is provided on the connecting pipe between the first nutrient solution inlet of the nutrient solution mixing box and the second nutrient solution outlet of the lowest group of hydroponic boxes among the several groups of hydroponic boxes, and the solenoid valve five is connected to the control system through a bus.

[0014] More preferably, the device further includes: a display screen; the display screen is electrically connected to the control system, and is used to display the pH value of the pH sensor, the concentration of the EC sensor, the liquid level information of the liquid level sensor, and the working status of the solenoid valve 1, solenoid valve 2, solenoid valve 3 and solenoid valve 4 received by the control system.

[0015] Preferably, a layer of the nutrient solution buffer disinfection tank is arranged between adjacent groups of hydroponic tanks; the second nutrient solution outlet of a group of hydroponic tanks located above the nutrient solution buffer disinfection tank is connected to the third nutrient solution inlet of the nutrient solution buffer disinfection tank; the second nutrient solution inlet of a group of hydroponic tanks located below the nutrient solution buffer disinfection tank is connected to the third nutrient solution outlet of the nutrient solution buffer disinfection tank.

[0016] Preferably, the concentrated nutrient solution inlet, the acid solution inlet, the alkali solution inlet, the clean water inlet, the first nutrient solution inlet and the first nutrient solution outlet are provided on the side of the box body of the nutrient solution mixing box.

[0017] Preferably, the hydroponic boxes are provided in two groups, namely the first group of hydroponic boxes and the second group of hydroponic boxes; the load-bearing frame is provided with a plurality of partition plates in parallel, dividing the space of the load-bearing frame into at least five layers, which are, from top to bottom,: the nutrient solution regulating component, the second group of hydroponic boxes, the nutrient solution buffer disinfection tank, the first group of hydroponic boxes and the nutrient solution mixing box.

[0018] Preferably, the control system is arranged on a side of the load-bearing frame.

[0019] Preferably, the body of the nutrient solution mixing box is made of polyethylene.

[0020] Preferably, fill lights are provided in the placement layer where the hydroponic boxes are arranged.

[0021] The leafy vegetable hydroponic device with nutrient solution recycling of the present invention solves the pollution problem during the circulation process of the existing hydroponic device and has the following advantages:

[0022] (1) The device of the utility model arranges the nutrient solution mixing box, several groups of hydroponic boxes, several nutrient solution buffer disinfection pools, and nutrient solution control components on different layers. By utilizing the height difference and combining with a water pump, the nutrient solution is transported to the highest layer, and then gravity is used to realize the recycling of the liquid. The nutrient solution between each layer is dynamically circulated and disinfected to ensure that there is no bacterial infection in the nutrient solution.

[0023] (2) The device of the utility model sets the nutrient solution regulating component on the highest layer and the nutrient solution mixing box on the lowest layer. The nutrient solution is automatically added to the nutrient solution mixing box by gravity. There is no need to set up an additional pump to pump each liquid into the nutrient solution mixing box. Only a valve regulating switch is required;

[0024] (3) The device of the utility model is provided with a separate nutrient solution mixing box for preparing nutrient solution, and is also provided with a concentrated nutrient solution barrel, an acid solution barrel, an alkali solution barrel and a clean water barrel, so as to avoid contamination between the liquids and facilitate the addition of each liquid after use;

[0025] (4) The device of the present invention is provided with a pH sensor and an EC sensor inside the nutrient solution mixing box, which can detect the pH and concentration of the nutrient solution. The pH sensor and the EC sensor are connected to the control system, which can monitor the pH and concentration of the nutrient solution in real time, and then control the opening of the corresponding solenoid valve through the control system to mix the nutrient solution;

[0026] (5) The device of the present invention is further provided with a liquid level sensor and an oxygenation pump inside the nutrient solution mixing box. The liquid level is monitored by the liquid level sensor, and the opening of the corresponding solenoid valve is controlled by the control system to ensure the stability of the liquid level position. In addition, the oxygenation pump can not only increase the oxygen concentration in the nutrient solution, but also play a stirring role to mix the nutrient solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a structural schematic diagram of a leafy vegetable hydroponic device with nutrient solution recycling.

[0028] Figure 2 It is a structural schematic diagram of the load-bearing frame of the utility model.

[0029] Figure 3 It is a structural schematic diagram of the nutrient solution mixing box of the present utility model.

[0030] Figure 4 It is a structural schematic diagram of the nutrient solution buffering and disinfection tank of the utility model.

[0031] Figure 5 It is a schematic diagram of the structure of the fill light of the first group of hydroponic boxes and the second group of hydroponic boxes of the utility model. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. 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.

[0033] A leafy vegetable hydroponic device with nutrient solution recycling, see Figures 1 to 5 The device comprises: a load-bearing frame 1, a nutrient solution mixing tank 2, several groups of hydroponic boxes, several nutrient solution buffering and disinfection tanks 4, a nutrient solution regulating and controlling component 6, and a control system 7. The load-bearing frame 1 is provided with several partitions arranged in parallel, dividing the space of the load-bearing frame 1 into several placement layers at different heights. The nutrient solution mixing tank 2, several groups of hydroponic boxes, several nutrient solution buffering and disinfection tanks 4, and the nutrient solution regulating and controlling component 6 are respectively arranged in the placement layers of the load-bearing frame 1, with the nutrient solution mixing tank 2 being located below the groups of hydroponic boxes, and the groups of hydroponic boxes being located below the nutrient solution regulating and controlling component 6, with each group of hydroponic boxes being located in a placement layer at a different height.

[0034] The nutrient solution mixing tank 2 is equipped with a concentrated nutrient solution inlet, an acid inlet, an alkaline solution inlet, a clean water inlet, a first nutrient solution inlet, and a first nutrient solution outlet. The nutrient solution control unit 6 includes a concentrated nutrient solution tank 15, an acid tank 13, an alkaline solution tank 14, and a clean water tank 16. Each hydroponic tank in a group is equipped with a second nutrient solution inlet and a second nutrient solution outlet, and each nutrient solution buffer and disinfection tank 4 is equipped with a third nutrient solution inlet and a third nutrient solution outlet.

[0035] The concentrated nutrient solution inlet of the nutrient solution mixing tank 2 is connected to the concentrated nutrient solution barrel 15, and a solenoid valve 11 is installed on the pipeline connecting the two barrels. The acid inlet of the nutrient solution mixing tank 2 is connected to the acid barrel 13, and a solenoid valve 2 is installed on the pipeline connecting the two barrels. The alkali solution inlet of the nutrient solution mixing tank 2 is connected to the alkali solution barrel 14, and a solenoid valve 3 is installed on the pipeline connecting the two barrels. The clean water inlet of the nutrient solution mixing tank 2 is connected to the clean water barrel 16, and a solenoid valve 4 is installed on the pipeline connecting the two barrels. Solenoid valves 11, 29, 30, and 42 are all connected to the control system 7 via a bus.

[0036] The first nutrient solution outlet of the nutrient solution mixing box 2 is connected to the second nutrient solution inlet of the group of hydroponic boxes at the highest point among several groups of hydroponic boxes (connected through the water pump pipe 18), and the first nutrient solution inlet of the nutrient solution mixing box 2 is connected to the second nutrient solution outlet of the group of hydroponic boxes at the lowest point among several groups of hydroponic boxes, forming a circulation pipeline for the nutrient solution. The nutrient solution buffer disinfection tank 4 is arranged in the circulation pipeline for disinfecting the nutrient solution.

[0037] The above-mentioned nutrient solution mixing box 2 is equipped with a water pump, a pH sensor and an EC sensor; the control system 7 is connected to the water pump, the pH sensor and the EC sensor through a bus; the water pump is used to pump the nutrient solution in the nutrient solution mixing box 2 into the hydroponic box; the pH sensor is used to monitor the acidity and alkalinity of the nutrient solution in the nutrient solution mixing box 2 in real time; the EC sensor is used to monitor the concentration of the nutrient solution in the nutrient solution mixing box 2 in real time.

[0038] For example, the control system 7 may adopt a Siemens S7-200 controller, the pH sensor may adopt a KML-P0-01A pH composite electrode and a matching isolated pH transmitter, and the EC sensor may adopt an S-EC-A2LT intelligent conductivity electrode.

[0039] The hydroponic boxes on each layer of the present invention are at different heights. The nutrient solution is pumped from the nutrient solution mixing box 2 on the bottom layer to the hydroponic boxes on the upper layer by a water pump. The nutrient solution in the hydroponic boxes is transferred from the upper layer to the lower layer by utilizing the gravity of the liquid. A nutrient solution buffer disinfection pool 4 is provided between adjacent hydroponic boxes to achieve disinfection of the nutrient solution, and the nutrient solution is finally returned to the nutrient solution mixing box 2, thereby completing the recycling of the nutrient solution.

[0040] According to a specific embodiment of the present invention, a liquid level sensor and an oxygen pump are further provided inside the nutrient solution mixing tank 2. The control system 7 is connected to the liquid level sensor and the oxygen pump via a bus. The liquid level sensor is used to monitor the nutrient solution level in the nutrient solution mixing tank 2 in real time, and the oxygen pump is used to increase the oxygen content in the nutrient solution and stir the nutrient solution.

[0041] For example, the oxygen pump can be placed in the same layer as the nutrient solution buffer disinfection tank 4 (see Figure 1 On the left side of the nutrient solution buffer disinfection tank 4, the air stone of the aeration pump is placed in the nutrient solution preparation box 2, and the aeration pump is connected to the air stone.

[0042] For example, the oxygen pump may be a DC-30A model, and the liquid level sensor may be a MAQI-136 immersion type liquid level sensor.

[0043] According to a specific embodiment of the present invention, a solenoid valve 5 8 is provided on the connecting pipe between the first nutrient solution inlet of the nutrient solution mixing box 2 and the second nutrient solution outlet of the lowest group of hydroponic boxes among several groups of hydroponic boxes, and the solenoid valve 5 8 is connected to the control system 7 through a bus.

[0044] According to a specific embodiment of the present invention, the device further includes a display screen 17. Display screen 17 is electrically connected to control system 7 and is used to display the pH value of the pH sensor, the concentration of the EC sensor, the liquid level information of the liquid level sensor, and the operating status of solenoid valve 11, solenoid valve 2, solenoid valve 9, solenoid valve 3, and solenoid valve 4, received by control system 7.

[0045] For example, the main window of display screen 17 primarily displays the dynamic detection results of each sensor and the operating status of each solenoid valve. A green button indicates an open solenoid valve, while a red button indicates a closed solenoid valve. Display screen 17 also displays start and stop buttons, which activate and deactivate the entire system. This display facilitates starting and stopping the system and monitoring the growth process, enhancing the user experience.

[0046] According to a specific embodiment of the present invention, a nutrient solution buffering and disinfecting tank 4 is provided between adjacent groups of hydroponic tanks. The second nutrient solution outlet of the hydroponic tank group located above the nutrient solution buffering and disinfecting tank 4 is connected to the third nutrient solution inlet of the nutrient solution buffering and disinfecting tank 4; the second nutrient solution inlet of the hydroponic tank group located below the nutrient solution buffering and disinfecting tank 4 is connected to the third nutrient solution outlet of the nutrient solution buffering and disinfecting tank 4.

[0047] According to a specific embodiment of the present invention, a concentrated nutrient solution inlet, an acid solution inlet, an alkali solution inlet, a clean water inlet, a first nutrient solution inlet and a first nutrient solution outlet are provided on the side of the box body of the nutrient solution mixing box 2 .

[0048] According to a specific embodiment of the present invention, two groups of hydroponic culture boxes are provided: a first group of hydroponic culture boxes 3 and a second group of hydroponic culture boxes 5. A plurality of partitions are arranged parallel to the load-bearing frame 1, dividing the space of the load-bearing frame 1 into at least five layers. From top to bottom, they are: a nutrient solution control component 6, a second group of hydroponic culture boxes 5, a nutrient solution buffer disinfection tank 4, a first group of hydroponic culture boxes 3, and a nutrient solution preparation tank 2.

[0049] According to a specific embodiment of the present invention, the control system 7 is arranged on the side of the load-bearing frame 1 .

[0050] According to a specific embodiment of the present invention, the body of the nutrient solution mixing box 2 is made of polyethylene, which is acid-resistant, alkali-resistant, sun-proof and drop-proof.

[0051] For example, the length, width and height of the nutrient solution preparation box 2 are 73 cm, 33 cm and 38 cm respectively.

[0052] According to a specific embodiment of the present invention, a fill light 19 is provided in each layer where the hydroponic boxes are placed.

[0053] Exemplarily, the fill light 19 may be an LED fill light.

[0054] The usage method and working principle of the leafy vegetable hydroponic device with nutrient solution recycling of the utility model are as follows:

[0055] During use, the pH sensor monitors the pH of the nutrient solution in nutrient solution mixing tank 2 in real time. If the pH of the nutrient solution is higher than the required pH for cultivation, the control system 7 controls the opening and closing of solenoid valve 2 9 to inject acid from acid solution tank 13 into nutrient solution mixing tank 2. If the pH of the nutrient solution is lower than the required pH for cultivation, the control system 7 controls the opening and closing of solenoid valve 3 10 to inject alkaline solution from alkaline solution tank 14 into nutrient solution mixing tank 2.

[0056] The EC sensor monitors the nutrient solution concentration in nutrient solution mixing tank 2 in real time. If the nutrient solution's EC value is lower than the required concentration for cultivation, the control system 7 controls the opening and closing of solenoid valve 11 to inject concentrated nutrient solution from concentrated nutrient solution tank 15 into nutrient solution mixing tank 2. If the nutrient solution's EC value is higher than the required concentration for cultivation, the control system 7 controls the opening and closing of solenoid valve 29 to inject clean water from clean water tank 16 into nutrient solution mixing tank 2.

[0057] The liquid level sensor monitors the nutrient solution level in the nutrient solution mixing tank 2 in real time. If the nutrient solution level falls below the set minimum level, the control system 7 controls the opening and closing of solenoid valves 2 9, 3, 10, 11, and 4 12 to replenish the nutrient solution in the nutrient solution mixing tank 2 until the set maximum level is reached.

[0058] When one or more of the solenoid valves 5 8 , 2 9 , 3 10 , 1 1 , and 4 12 are working, the aeration pump is controlled by the control system 7 . On the one hand, the aeration pump can increase the oxygen content of the nutrient solution in the nutrient solution mixing tank 2 , thereby ensuring the normal growth and development of the plants in the first and second hydroponic tanks 3 and 5 . On the other hand, the aeration pump plays a stirring role to mix the nutrient solution.

[0059] A water pump is set in the nutrient solution mixing box 2, and the extracted nutrient solution flows into the second group of hydroponic boxes 5. The nutrient solution in the second group of hydroponic boxes 5 flows directly to the nutrient solution buffer disinfection pool 4 through pipeline connection and gravity. While disinfection is being carried out, the nutrient solution in the nutrient solution buffer disinfection pool 4 flows directly to the first group of hydroponic boxes 3 through pipeline connection and gravity. Finally, the nutrient solution in the first group of hydroponic boxes 3 flows directly to the nutrient solution mixing box 2 through pipeline connection and gravity, thereby completing the nutrient solution recycling of the entire device.

[0060] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A leafy vegetable hydroponic device with nutrient solution recycling, characterized in that: The device comprises: a load-bearing frame (1), a nutrient solution mixing box (2), a plurality of hydroponic boxes, a plurality of nutrient solution buffering and disinfection pools (4), a nutrient solution regulating component (6) and a control system (7); The load-bearing frame (1) is provided with a plurality of partition plates in parallel, which divide the space of the load-bearing frame (1) into a plurality of placement layers at different heights; the nutrient solution mixing box (2), a plurality of groups of hydroponic boxes, a plurality of nutrient solution buffer disinfection pools (4) and a nutrient solution regulating component (6) are respectively arranged in the plurality of placement layers of the load-bearing frame (1); the nutrient solution mixing box (2) is located below the plurality of groups of hydroponic boxes, the plurality of groups of hydroponic boxes are located below the nutrient solution regulating component (6), and each group of hydroponic boxes is located in a placement layer at a different height; The nutrient solution mixing box (2) is provided with a concentrated nutrient solution inlet, an acid solution inlet, an alkali solution inlet, a clean water inlet, a first nutrient solution inlet and a first nutrient solution outlet; the nutrient solution regulating component (6) comprises: a concentrated nutrient solution barrel (15), an acid solution barrel (13), an alkali solution barrel (14) and a clean water barrel (16); each hydroponic tank in each group is provided with a second nutrient solution inlet and a second nutrient solution outlet, and each nutrient solution buffer disinfection tank (4) is provided with a third nutrient solution inlet and a third nutrient solution outlet; The concentrated nutrient solution inlet of the nutrient solution mixing box (2) is connected to the concentrated nutrient solution barrel (15), and a solenoid valve (11) is provided on the pipeline between the nutrient solution mixing box (2) and the concentrated nutrient solution barrel (15); the acid solution inlet of the nutrient solution mixing box (2) is connected to the acid solution barrel (13), and a solenoid valve (9) is provided on the pipeline between the nutrient solution mixing box (2) and the acid solution barrel (13); the alkali solution inlet of the nutrient solution mixing box (2) is connected to the alkali solution barrel (14) is connected, and a solenoid valve three (10) is provided on the pipeline connecting the nutrient solution mixing box (2) and the alkali solution barrel (14); the clean water inlet of the nutrient solution mixing box (2) is connected to the clean water barrel (16), and a solenoid valve four (12) is provided on the pipeline connecting the nutrient solution mixing box (2) and the clean water barrel (16); the solenoid valve one (11), the solenoid valve two (9), the solenoid valve three (10) and the solenoid valve four (12) are all connected to the control system (7) through a bus; The first nutrient solution outlet of the nutrient solution mixing box (2) is connected to the second nutrient solution inlet of the hydroponic box group at the highest position among the plurality of hydroponic boxes, and the first nutrient solution inlet of the nutrient solution mixing box (2) is connected to the second nutrient solution outlet of the hydroponic box group at the lowest position among the plurality of hydroponic boxes, forming a circulation pipeline for the nutrient solution. The nutrient solution buffer disinfection tank (4) is arranged in the circulation pipeline for disinfecting the nutrient solution. A water pump, a pH sensor, and an EC sensor are provided inside the nutrient solution mixing box (2); the control system (7) is connected to the water pump, the pH sensor, and the EC sensor via a bus; the water pump is used to pump the nutrient solution in the nutrient solution mixing box (2) into the hydroponic box; the pH sensor is used to monitor the pH value of the nutrient solution in the nutrient solution mixing box (2) in real time; and the EC sensor is used to monitor the concentration of the nutrient solution in the nutrient solution mixing box (2) in real time.

2. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 1, characterized in that: The nutrient solution mixing box (2) is further provided with a liquid level sensor and an oxygenation pump; the control system (7) is connected to the liquid level sensor and the oxygenation pump via a bus; the liquid level sensor is used to monitor the liquid level of the nutrient solution in the nutrient solution mixing box (2) in real time; and the oxygenation pump is used to increase the oxygen content in the nutrient solution and stir the nutrient solution.

3. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 2, characterized in that: A solenoid valve five (8) is provided on a communication pipe between the first nutrient solution inlet of the nutrient solution mixing box (2) and the second nutrient solution outlet of the lowest group of hydroponic boxes among the plurality of groups of hydroponic boxes. The solenoid valve five (8) is connected to the control system (7) via a bus.

4. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 3, characterized in that: The device further comprises: a display screen (17); The display screen (17) is electrically connected to the control system (7) and is used to display the pH value of the pH sensor, the concentration of the EC sensor, the liquid level information of the liquid level sensor, and the working status of the solenoid valve 1 (11), the solenoid valve 2 (9), the solenoid valve 3 (10), and the solenoid valve 4 (12) received by the control system (7).

5. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 1, characterized in that: A layer of the nutrient solution buffering and disinfecting pool (4) is provided between adjacent groups of hydroponic boxes; a group of hydroponic boxes located above the nutrient solution buffering and disinfecting pool (4) has a second nutrient solution outlet connected to a third nutrient solution inlet of the nutrient solution buffering and disinfecting pool (4); a group of hydroponic boxes located below the nutrient solution buffering and disinfecting pool (4) has a second nutrient solution inlet connected to the third nutrient solution outlet of the nutrient solution buffering and disinfecting pool (4).

6. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 1, characterized in that: The concentrated nutrient solution inlet, the acid solution inlet, the alkali solution inlet, the clean water inlet, the first nutrient solution inlet and the first nutrient solution outlet are arranged on the side of the box body of the nutrient solution mixing box (2).

7. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 1, characterized in that: The hydroponic boxes are provided in two groups, namely a first group of hydroponic boxes (3) and a second group of hydroponic boxes (5); The load-bearing frame (1) is provided with a plurality of partition plates in parallel, dividing the space of the load-bearing frame (1) into at least five layers, which are arranged from top to bottom in the following order: the nutrient solution regulating component (6), the second group of hydroponic boxes (5), the nutrient solution buffer disinfection pool (4), the first group of hydroponic boxes (3) and the nutrient solution mixing box (2).

8. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 1, characterized in that: The control system (7) is arranged on the side of the load-bearing frame (1).

9. The leafy vegetable hydroponic device with nutrient solution recycling according to claim 1, characterized in that: The box body of the nutrient solution preparation box (2) is made of polyethylene.

10. The leafy vegetable hydroponic cultivation device with nutrient solution recycling according to any one of claims 1 to 9, characterized in that: In the placement layer where the hydroponic boxes are arranged, supplementary lights (19) are arranged.

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