A device and method for preparing a nutrient solution based on supersaturated nutrient salts

Abstract

This invention relates to a nutrient solution preparation device and method based on supersaturated nutrients, belonging to the field of nutrient solution preparation technology. It includes a preparation tank, an intermittent drive structure, a quantitative water delivery device, and a quantitative feeding device; it also includes a placement seat disposed within the preparation tank and intermittently rotated under the drive of the intermittent drive structure; multiple fixed drainage structures arranged circumferentially on the placement seat, each fixed drainage structure having a hollow shaft at its lower end and a secondary driven gear on its outer side; and a mixing tube disposed at the upper end of the fixed drainage structures for preparing a supersaturated nutrient solution. The mixing tube contains a curved tube for drainage, and the curved tube is connected to the hollow shaft. The preparation tank contains a transmission gear ring that engages with the secondary driven gear. This invention prepares nutrient solutions based on supersaturated solutions and solubility, avoiding excessive steps and cumbersome calculations, making operation convenient and fast, and the device has high operating efficiency and good dispersion effect.

Description

Technical Field

[0001] This invention belongs to the field of nutrient solution preparation technology, specifically relating to a nutrient solution preparation device and method based on supersaturated nutrient salts. Background Technology

[0002] When conducting hydroponics production, it is necessary to correctly prepare the nutrient solution based on the selected nutrient solution formula. The nutrient solution can be prepared by first preparing a concentrated nutrient solution and then using the concentrated nutrient solution to prepare a working nutrient solution (concentrated nutrient solution dilution method); or by directly weighing each nutrient element compound to prepare the working nutrient solution (direct weighing preparation method). Both methods should be carried out with the general guiding principle of not producing precipitates of insoluble substances during the preparation process. In the concentrated nutrient solution dilution method, the concentration ratio of the concentrated solution should be determined according to the dosage specified in the nutrient solution formula and the solubility of each salt, so as not to cause supersaturation and precipitation. Moreover, the concentration of the concentrated solution should not be too high, otherwise the dissolution will be slow and the operation will be inconvenient.

[0003] Furthermore, when selecting salts for use as fertilizers, their solubility must be a primary consideration to determine the appropriate dissolution method. For ease of operation, easily soluble fertilizer salts are often used without considering the dissolution method. Some fertilizer salts contain water of crystallization, making calculations and conversions cumbersome. The weighing and dissolving processes of various salts can easily lead to confusion or loss, making the operation tedious. Therefore, there is currently a lack of simple and easy-to-implement methods for preparing nutrient solutions. To address this, we propose a nutrient solution preparation device and method based on supersaturated nutrient salts. Summary of the Invention

[0004] The purpose of this invention is to provide a nutrient solution preparation device and method based on supersaturated nutrients in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] The present invention provides a nutrient solution preparation device based on supersaturated nutrients, including a preparation tank, an intermittent drive structure, a quantitative water conveying device and a quantitative feeding device; and a placement seat disposed inside the preparation tank and intermittently rotating under the drive of the intermittent drive structure.

[0007] Multiple fixed drainage structures are arranged in a circular shape on the placement base. Each fixed drainage structure has a hollow shaft at its lower end, and a secondary driven gear is located on the outer side of the hollow shaft.

[0008] A mixing tube, located at the upper end of the fixed drainage structure, is used to prepare a supersaturated solution of nutrients. The mixing tube contains a curved tube for drainage, and the curved tube is connected to a hollow shaft. The preparation tank contains a transmission gear ring that engages with the secondary driven gear.

[0009] As a further optimization of the present invention, the placement base includes a hollow vertical cylinder and an upper horizontal frame and a lower horizontal frame disposed at the upper and lower ends of the hollow vertical cylinder, and a supporting main shaft is vertically disposed in the middle of the upper horizontal frame and the lower horizontal frame.

[0010] As a further optimization of the present invention, the intermittent drive structure includes a drive motor, an intermittent wheel that is shaft-connected to the drive end of the drive motor, and a main and driven gear that is shaft-connected to the supporting main shaft. The main and driven gear and the intermittent wheel are meshed and driven together.

[0011] As a further optimization of the present invention, the upper end of the placement base is provided with multiple through holes for movably fixing the dispensing tube. The dispensing tube also includes a tube body and a tube edge provided at the upper end of the tube body. The tube body extends out from the through holes, and the tube edge rests on the upper end surface of the placement base. The lower middle end of the outer side of the curved tube is provided with a drain hole.

[0012] As a further optimization of the present invention, the fixed drainage structure further includes a fixing seat for fixing the mixing pipe, the fixing seat is provided with a sealed bearing connected to the bottom end of the mixing pipe, the hollow shaft is provided with a sliding seat that slides with the lower end of the placement seat, the inner wall of the preparation tank is provided with a guide seat that moves with the sliding seat, and the hollow shaft is also provided with a baffle and a metering valve.

[0013] As a further optimization of the present invention, a water pump is provided on the side of the preparation tank, and a feed pump is provided at the lower end of the preparation tank. A stirring rod connected to the placement seat is provided inside the preparation tank.

[0014] The present invention also provides a method for preparing a nutrient solution based on supersaturated nutrients using any of the apparatuses described above, comprising the following steps:

[0015] S1. Preparation of supersaturated solutions of various nutrients: Prepare the required nutrients according to the nutrient solution composition formula, and prepare supersaturated solutions of various nutrients.

[0016] The specific process is as follows: the intermittent drive structure drives the placement seat to rotate intermittently, so that multiple dispensing tubes on the placement seat rotate intermittently at the same time. Meanwhile, water and a nutrient salt are sequentially input into each dispensing tube using a quantitative water delivery device and a quantitative feeding device to prepare a supersaturated solution of multiple nutrient salts, that is, some nutrient salts cannot be dissolved at the bottom of each dispensing tube.

[0017] S2. Prepare the nutrient solution. Determine the volume L of the nutrient solution to be prepared, and add 3 / 4 to 4 / 5 of the volume L of water to the preparation tank in advance. Determine the volume of each nutrient salt to be added to the nutrient solution according to the amount and solubility of each nutrient salt specified in the nutrient solution component formula. Use the fixed drainage structure to quantitatively discharge the supersaturated solution of the nutrient salt prepared in each mixing tube into the preparation tank 1. Finally, add water to make up to the volume L to complete the nutrient solution preparation process.

[0018] As a further optimization of the present invention, in step S1, the types of nutrients include, but are not limited to, calcium nitrate, potassium nitrate, potassium dihydrogen phosphate, magnesium sulfate, ferrous sulfate, EDTA, boric acid, manganese sulfate, zinc sulfate, copper sulfate, and ammonium molybdate.

[0019] As a further optimization of the present invention, the preparation environment temperature for both steps S1 and S2 is 20°C or 25°C.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) The preparation device provided by the present invention can complete the preparation of supersaturated solutions of various nutrients and nutrient solutions in an integrated manner, with high efficiency and good dispersion effect, and good application effect.

[0022] (2) The present invention is based on the preparation of nutrient solution by supersaturated solution and solubility, avoiding too many steps and complicated calculations, and is convenient and fast to operate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the preparation tank provided by the present invention;

[0024] Figure 2 An elevation sectional view provided for this invention;

[0025] Figure 3 This is a top view of the placement seat provided by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the dispensing pipe provided by the present invention;

[0027] Figure 5 Provided by the present invention Figure 2 Enlarged view of the structure of section A in the middle;

[0028] In the diagram: 1. Preparation tank; 2. Placement seat; 21. Hollow vertical cylinder; 22. Upper horizontal frame; 23. Lower horizontal frame; 24. Supporting main shaft; 3. Fixed drainage structure; 31. Fixed seat; 32. Hollow shaft; 33. Sealed bearing; 34. Sliding seat; 35. Secondary driven gear; 36. Metering valve; 37. Baffle; 4. Mixing pipe; 41. Pipe body; 42. Pipe edge; 43. Curved pipe; 44. Drain hole; 5. Quantitative water delivery device; 6. Quantitative feeding device; 7. Intermittent drive structure; 71. Drive motor; 72. Intermittent wheel; 73. Main and driven gears; 8. Stirring rod; 9. Water pump; 10. Feed pump; 11. Transmission gear ring; 12. Guide seat. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0030] Example 1

[0031] like Figure 1-2 As shown, a nutrient solution preparation device based on supersaturated nutrients includes a preparation tank 1, an intermittent drive structure 7, a quantitative water conveying device 5, and a quantitative feeding device 6; it also includes a placement seat 2 disposed inside the preparation tank 1 and intermittently rotating under the drive of the intermittent drive structure 7.

[0032] Multiple fixed drainage structures 3 are arranged in a circular shape on the placement base 2. Each fixed drainage structure 3 has a hollow shaft 32 at its lower end, and a secondary driven gear 35 is provided on the outer side of the hollow shaft 32.

[0033] The mixing pipe 4 is located at the upper end of the fixed drainage structure 3 and is used to prepare a supersaturated solution of nutrients. The mixing pipe 4 is provided with a curved pipe 43 for drainage, and the curved pipe 43 is connected to one end of the hollow shaft 32 that extends into the pipe body 41. The connection method is preferably to ensure the sealing of the connection between the two. The preparation tank 1 is provided with a transmission gear ring 11 that is driven and cooperates with the secondary driven gear 35.

[0034] The preparation tank 1 is equipped with a water pump 9 on its side for metered water delivery into the preparation tank 1, and a feed pump 10 is provided at the lower end of the preparation tank 1 for discharging the prepared nutrient solution out of the preparation tank 1. The preparation tank 1 is equipped with a stirring rod 8 connected to the placement seat 2. The stirring rod 8 is linked with the placement seat 2. While the placement seat 2 rotates intermittently, the stirring rod 8 also rotates intermittently to stir and make the supersaturated solutions of each nutrient salt evenly mixed.

[0035] Furthermore, such as Figure 2As shown, the placement base 2 includes a hollow vertical cylinder 21 and an upper horizontal frame 22 and a lower horizontal frame 23 located at the upper and lower ends of the hollow vertical cylinder 21. A supporting main shaft 24 is vertically arranged in the middle of the upper horizontal frame 22 and the lower horizontal frame 23. The hollow vertical cylinder 21 is used to connect the upper horizontal frame 22 and the lower horizontal frame 23. The upper horizontal frame 22 has circumferentially distributed through holes for fixing each dispensing pipe 4. The structure is as follows: Figure 3 As shown, the diameter of the lower horizontal frame 23 is smaller than that of the upper horizontal frame 22. The lower horizontal frame 23 cooperates with the guide seat 12 on the inner wall of the preparation tank 1, and a limiting groove is formed between the two. The sliding seat 34 of the fixed drainage structure 3 moves in the limiting groove. In addition, the hollow vertical cylinder 21 is hollow, which can reduce its own weight and reduce the running resistance of the device.

[0036] Furthermore, in this embodiment, as Figure 3 As shown, the intermittent drive structure 7 includes a drive motor 71, an intermittent wheel 72 shaft-connected to the drive end of the drive motor 71, and a driving gear 73 shaft-connected to the supporting main shaft 24. The driving gear 73 and the intermittent wheel 72 are meshed and connected in a transmission relationship. In specific use, the drive motor 71 drives the intermittent wheel 72 to rotate at a constant speed, such as... Figure 3 As shown, the intermittent wheel 72 contains only one transmission tooth. After rotating one revolution, it meshes with the main and driven gears 73 connected to the supporting main shaft 24, thereby causing the main and driven gears 73 to swing at a certain angle, which in turn causes the supporting main shaft 24 connected to the main and driven gears 73 to rotate at a certain angle. As the intermittent wheel 72 rotates at a constant speed, the main and driven gears 73 and the supporting main shaft 24 achieve periodic rotation, resulting in the intermittent rotation effect of the entire placement seat 2.

[0037] Furthermore, such as Figure 4-5 As shown, the upper end of the placement base 2 has multiple through holes for movably fixing the mixing tube 4. The mixing tube 4 also includes a tube body 41 and a tube edge 42 located at the upper end of the tube body 41. The tube body 41 extends out from the through holes, and the tube edge 42 rests on the upper surface of the placement base 2. The tube body 41 of the mixing tube 4 extends into the upper end of the placement base 2 from the through holes until the tube edge 42 at the upper end of the tube body 41 rests on the upper end of the placement base 2, so that the lower end of the tube body 41 is engaged with the fixing base 31, so that the curved tube 43 is connected to the hollow shaft 32. To ensure the tightness of the connection between the two, a threaded connection is preferred. The lower middle end of the outer side of the curved tube 43 is provided with a drain hole 44, which is used for draining the supersaturated solution of nutrient salts prepared inside the mixing tube 4. According to the above operation, multiple mixing tubes 4 are installed on the placement base 2 in sequence and installed with the fixed drain structure 3.

[0038] The fixed drainage structure 3 also includes a fixing seat 31 for fixing the mixing pipe 4. The fixing seat 31 is provided with a sealed bearing 33 connected to the bottom end of the mixing pipe 4. The hollow shaft 32 and the sealed bearing 33 are connected by a sleeve connection. The sealed bearing 33 ensures the structural sealing of the bottom end of the mixing pipe 4 when the hollow shaft 32 rotates, preventing leakage. The hollow shaft 32 is provided with a sliding seat 34 that slides with the lower end of the placement seat 2. The inner wall of the preparation tank 1 is provided with a guide seat 12 that moves with the sliding seat 34. When the placement seat 2 rotates intermittently, causing the mixing pipe 4 on it to rotate, the sliding seat 34 of the fixed drainage structure 3 connected to the mixing pipe 4 slides relative to the guide seat 12. The guide seat 12 plays a guiding and structural support role. The hollow shaft 32 is also provided with a baffle 37 and a metering valve 36. The baffle 37 is set inside the preparation tank 1 to prevent splashing when preparing nutrient solution. To further prevent splashing, a flow guide can be set inside the preparation tank 1 near the mixing pipe 4 to isolate and guide the flow.

[0039] The working principle of the entire device is as follows: As mentioned above, after each dispensing pipe 4 is installed with the placement seat 2 and the fixed drainage structure 3, the drive motor 71 starts and drives the intermittent wheel 72 to rotate. After the intermittent wheel 72 rotates once, it meshes with the main and driven gears 73 to drive the main and driven gears 73 to drive the supporting main shaft 24 to rotate synchronously. As the intermittent wheel 72 rotates at a uniform speed, the main and driven gears 73 and the supporting main shaft 24 achieve periodic intermittent rotation, thereby driving the entire placement seat 2 to achieve intermittent rotation.

[0040] During the intermittent rotation of the placement seat 2, each dispensing tube 4 placed on the placement seat 2 will be aligned with the quantitative water delivery device 5 and the quantitative feeding device 6 in sequence. Water and a nutrient salt are sequentially input into each dispensing tube 4 using the quantitative water delivery device 5 and the quantitative feeding device 6 to prepare a supersaturated solution of multiple nutrient salts. To ensure ease of operation, the quantitative water delivery device 5 injects an equal volume of water (e.g., 100ml, 1000ml) into each dispensing tube 4. Then, based on the solubility of multiple nutrient salts, the amount required for each nutrient solution to completely dissolve in, for example, 100ml or 1000ml of water (referred to as the saturation amount) is calculated. The quantitative feeding device 6 is used to add nutrient salts greater than the saturation amount into the dispensing tube 4 to ensure that a supersaturated solution can be prepared.

[0041] During the intermittent rotation of the placement seat 2, the sliding seat 34 of the fixed drainage structure 3 slides against the guide seat 12 inside the preparation tank 1. At the same time, the secondary driven gear 35 on the hollow shaft 32 of the fixed drainage structure 3 meshes with the transmission gear ring 11 on the inner wall of the preparation tank 1. The secondary driven gear 35 rotates, causing the hollow shaft 32 to rotate as well. The hollow shaft 32 extends into the tube body 41 of the mixing tube 4 and connects with the curved tube 43. In turn, the hollow shaft 32 drives the curved tube 43 connected to it to rotate. While the curved tube 43 rotates inside the tube body 41, it achieves stirring and dispersion during the preparation of the supersaturated solution of nutrients.

[0042] After each mixing tube 4 has completed the preparation of the supersaturated nutrient solution, determine the required volume L of the nutrient solution. Use the water pump 9 to add 3 / 4 to 4 / 5 of the volume L of water to the preparation tank 1. Determine the volume of each nutrient salt to be added to the nutrient solution based on the dosage and solubility of each nutrient salt specified in the nutrient solution formula. Sequentially open the metering valve 36 on the hollow shaft 32 connected to each curved tube 43. Since the drain hole 44 is located at the middle and lower end of the curved tube 43, as the metering valve 36 is opened, the solution inside each mixing tube 4 will enter the hollow shaft 32 through the drain hole 44 and be quantitatively discharged into the preparation tank 1 by the hollow shaft 32. The stirring rod 8 inside the preparation tank 1 will thoroughly mix the supersaturated nutrient solution with the water inside the preparation tank 1. Finally, add water to make up the volume L to complete the nutrient solution preparation process.

[0043] Example 2

[0044] Based on Example 1, the present invention also provides a method for preparing a nutrient solution based on supersaturated nutrients, comprising the following steps:

[0045] S1. Preparation of supersaturated solutions of various nutrients: Prepare the required nutrients according to the nutrient solution composition formula, and prepare supersaturated solutions of various nutrients.

[0046] The specific process is as follows: the intermittent drive structure 7 drives the placement seat 2 to rotate intermittently, so that the multiple dispensing tubes 4 on the placement seat 2 rotate intermittently together. At the same time, the quantitative water delivery device 5 and the quantitative feeding device 6 sequentially input water and a nutrient salt into each dispensing tube 4 to prepare a supersaturated solution of multiple nutrient salts, that is, some nutrient salts cannot be dissolved at the bottom of each dispensing tube 4.

[0047] S2. Prepare the nutrient solution. Determine the volume L of the nutrient solution to be prepared, and add 3 / 4 to 4 / 5 of the volume L of water to the preparation tank 1 in advance. Determine the volume of each nutrient salt to be added to the nutrient solution according to the amount and solubility of each nutrient salt specified in the nutrient solution component formula. Use the fixed drainage structure 3 to quantitatively discharge the supersaturated solution of the nutrient salt prepared in each mixing tube 4 into the preparation tank 1. Finally, add water to make up to the volume L to complete the nutrient solution preparation process.

[0048] In step S1, the types of nutrients include, but are not limited to, calcium nitrate, potassium nitrate, potassium dihydrogen phosphate, magnesium sulfate, ferrous sulfate, EDTA, boric acid, manganese sulfate, zinc sulfate, copper sulfate, and ammonium molybdate.

[0049] The ambient temperature for both steps S1 and S2 is 20°C or 25°C.

[0050] Taking the preparation of 10L Hoglund solution as an example, the preparation was carried out at an ambient temperature of 20℃. The composition of the Hoglund solution and the solubility of each component at 20℃ are shown in Table 1:

[0051] Table 1. Hoglund Solution Component Formulation Table

[0052]

[0053]

[0054] Note: At a certain temperature, the mass of solute that dissolves in 100g of solvent when a solid substance reaches saturation is called the solubility of that solid substance in that solvent, which is a physical property.

[0055] In this process, 2 mL of FeEDTA solution is added to every 1 L of Hoglund solution. The FeEDTA solution is prepared fresh from component C.

[0056] The specific preparation process is as follows: Take two clean, dry beakers, and add 3.73g of EDTA-Na2 and 2.78g of FeSO4 respectively. 4· To dissolve solid 7H₂O, boil 1L of pure water, cool to 70℃, and then add 300mL of the solution to a beaker containing EDTA-Na₂. Stir to dissolve. Measure 200mL of pure water, cool, and then add FeSO₄... 4· In a beaker containing 7H2O, stir to dissolve, then add FeSO4. 4· Slowly add 7H2O solution to EDTA-Na2 solution while stirring to obtain iron salt solution. Finally, pour the iron salt solution into a brown bottle (in the dark) and store it at low temperature.

[0057] The preparation process of Hoglund's solution is as follows:

[0058] S1. Prepare supersaturated solutions of each nutrient salt. Taking the supersaturated solution of calcium nitrate as an example, use the quantitative water delivery device 5 to inject a quantitative amount of 100 mL of water into the mixing tube 4. According to the component formula in Table 1, the solubility of calcium nitrate in 100 mL of water is 129 g. It is only necessary to use the quantitative feeding device 6 to add more than 129 g of calcium nitrate into the mixing tube 4. Roughly adjust the amount of calcium nitrate to ensure that some calcium nitrate at the bottom of the mixing tube 4 cannot be dissolved. This completes the preparation of the supersaturated solution of calcium nitrate. As the intermittent drive structure 7 drives the entire placement seat 2 to rotate intermittently, the preparation process of the supersaturated solutions of other components in Table 1 is completed according to the preparation method of the supersaturated solution of calcium nitrate. Among them, component C is prepared and used immediately.

[0059] S2. Prepare the nutrient solution. Add 7.5L of water to preparation tank 1 in advance. Determine the volume of each nutrient salt to be added to the nutrient solution according to the dosage and solubility of each nutrient salt specified in the nutrient solution composition formula. Taking calcium nitrate as an example, the required dosage of calcium nitrate is 9.45g, and its solubility is 129g / 100mL. After calculation, the volume of calcium nitrate to be added is 945 / 129, which is approximately equal to 7.33mL. That is, add 7.33mL of supersaturated calcium nitrate solution to preparation tank 1. Take calcium nitrate as an example to complete the addition of supersaturated solutions of other components in Table 1. Finally, add water to make up to the volume L to complete the nutrient solution preparation process.

[0060] The preparation method provided by this invention is very convenient for preparing supersaturated solutions of various nutrients, thus avoiding excessive steps and tedious calculations, and is easy and quick to operate.

[0061] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A supersaturated nutrient salt based nutrient solution formulation apparatus, characterized by: It includes a preparation tank (1), an intermittent drive structure (7), a quantitative water conveying device (5) and a quantitative feeding device (6); it also includes a placement seat (2) located inside the preparation tank (1) and intermittently rotating under the drive of the intermittent drive structure (7); Multiple fixed drainage structures (3) are arranged in a circular shape on the placement seat (2). The fixed drainage structure (3) includes a fixed seat (31) for fixing the mixing tube (4). The lower end of the fixed seat (31) is provided with a hollow shaft (32) and a secondary driven gear (35) is provided on the outer side of the hollow shaft (32). The fixed seat (31) is provided with a sealed bearing (33) connected to the bottom end of the mixing tube (4). The hollow shaft (32) is provided with a sliding seat (34). The hollow shaft (32) and the sealed bearing (33) are connected by a sleeve. The inner wall of the preparation tank (1) is provided with a guide seat (12) that is movably engaged with the sliding seat (34). During the intermittent rotation of the entire placement seat (2), the sliding seat (34) of the fixed drainage structure (3) slides against the guide seat (12) on the inner side of the preparation tank (1). The hollow shaft (32) is also provided with a baffle (37) and a metering valve (36). The mixing tube (4) is located at the upper end of the fixed drainage structure (3) and is used to prepare a supersaturated solution of nutrient salts. The mixing tube (4) is provided with a curved tube (43) for drainage, and the curved tube (43) is connected to the hollow shaft (32). The preparation tank (1) is provided with a transmission gear ring (11) that is driven by the secondary driven gear (35). The upper end of the placement seat (2) is provided with multiple through holes for moving and fixing the mixing tube (4). The mixing tube (4) also includes a tube body (41) and a tube edge (42) located at the upper end of the tube body (41). The tube body (41) extends out from the through hole, and the tube edge (42) rests on the upper end face of the placement seat (2). The lower middle end of the curved tube (43) is provided with a drainage hole (44). During the intermittent rotation of the entire placement seat (2), each dispensing pipe (4) placed on the placement seat (2) will be aligned with the quantitative water delivery device (5) and the quantitative feeding device (6) in sequence.

2. The nutrient solution preparation device based on supersaturated nutrients according to claim 1, characterized in that: The placement seat (2) includes a hollow vertical tube (21) and an upper horizontal frame (22) and a lower horizontal frame (23) located at the upper and lower ends of the hollow vertical tube (21). A supporting main shaft (24) is vertically arranged in the middle of the upper horizontal frame (22) and the lower horizontal frame (23).

3. The nutrient solution preparation device based on supersaturated nutrients according to claim 2, characterized in that: The intermittent drive structure (7) includes a drive motor (71), an intermittent wheel (72) that is shaft-connected to the drive end of the drive motor (71), and a master-driven gear (73) that is shaft-connected to the support main shaft (24). The master-driven gear (73) and the intermittent wheel (72) are meshed and driven together.

4. The nutrient solution preparation device based on supersaturated nutrients according to claim 1, characterized in that: The preparation tank (1) is equipped with a water pump (9) on its side and a feed pump (10) at the lower end of the preparation tank (1). The preparation tank (1) is equipped with a stirring rod (8) connected to the placement seat (2).

5. A method for preparing a nutrient solution based on supersaturated nutrients using the apparatus according to any one of claims 1-4, characterized in that: Includes the following steps: S1. Preparation of supersaturated solutions of various nutrients: Prepare the required nutrients according to the nutrient solution composition formula, and prepare supersaturated solutions of various nutrients. The specific process is as follows: the intermittent drive structure (7) drives the placement seat (2) to rotate intermittently, so that multiple mixing tubes (4) on the placement seat (2) rotate intermittently together. At the same time, the quantitative water supply device (5) and the quantitative feeding device (6) sequentially input water and a nutrient salt into each mixing tube (4) to prepare a supersaturated solution of multiple nutrient salts, that is, some nutrient salts cannot be dissolved at the bottom of each mixing tube (4). S2. Prepare the nutrient solution. Determine the volume L of the nutrient solution to be prepared and add 3 / 4 to 4 / 5 of the volume L of water to the preparation tank (1) in advance. Determine the volume of each nutrient salt to be added to the nutrient solution according to the amount of each nutrient salt specified in the nutrient solution component formula and the solubility of each nutrient salt. Use the fixed drainage structure (3) to quantitatively discharge the supersaturated solution of the nutrient salt prepared in each mixing tube (4) into the preparation tank (1). Finally, add water to make up to the volume L to complete the preparation process of the nutrient solution.

6. The method according to claim 5, characterized in that, In step S1, the types of nutrients include calcium nitrate, potassium nitrate, potassium dihydrogen phosphate, magnesium sulfate, ferrous sulfate, EDTA, boric acid, manganese sulfate, zinc sulfate, copper sulfate, or ammonium molybdate.

7. The method according to claim 5, characterized in that, The ambient temperature for both steps S1 and S2 is 20°C or 25°C.

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