Hydroponic solution supply system

Abstract

The invention discloses a hydroponic solution supply system, which comprises at least one liquid level monitoring unit, a nutrient solution storage mechanism, a nutrient solution preparation mechanism and a nutrient solution control mechanism, and is characterized in that the liquid level monitoring unit is arranged at the upper edge of each hydroponic pool, is communicated with the nutrient solution storage mechanism, and conveys a nutrient solution into the hydroponic pool in a self-adaptive manner; the nutrient solution storage mechanism comprises a nutrient solution storage cavity, a piston, a water pressure box mechanism and a drainage water storage tank, the liquid inlet end of the nutrient solution storage cavity is communicated with the nutrient solution preparation mechanism, the piston is slidably arranged above the nutrient solution storage cavity and makes contact with the nutrient solution, and the water pressure box mechanism is arranged at the top of the piston and communicated with the drainage water storage tank through a pipeline; the nutrient solution control mechanism comprises a motor lifting unit and a control circuit, and the motor lifting unit controls the piston to ascend and descend in a self-adaptive mode through the control circuit. According to the system, the functions of quickly sensing the stock of the nutrient solution in the hydroponic pool and timely and accurately supplementing the nutrient solution are achieved, the defects of a traditional manual supplementing method are effectively overcome, and the system is worthy of being vigorously popularized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural hydroponic planting technology, and particularly relates to a hydroponic liquid supply system. BACKGROUND

[0002] In modern agriculture, the layered soilless culture technology has been widely used due to its advantages of less land occupation, high space utilization rate and high yield per unit area. In the specific implementation of this technology, how to supply nutrient solution to a large number of water culture pools is a key problem. At present, the traditional method is to first rely on manpower to find the water culture pool with insufficient nutrient solution, and then rely on manpower to supplement the nutrient solution to reach the preset value. This method has many defects:

[0003] (1) When the nutrient solution in the water culture pool is insufficient, it is difficult for the artificial to quickly perceive and timely and accurately supplement. Especially when multiple crops are cultivated in the water culture greenhouse at the same time, the consumption rate of nutrient solution by different crops may be very different, which requires quick finding of the water culture pool with insufficient nutrient solution and timely supplementing. Otherwise, the growth of crops may be affected, and ultimately the yield may be reduced.

[0004] (2) In the case that the number of water culture pools in the water culture greenhouse is large and stacked in layers, the method of manually supplying nutrient solution is low in efficiency and time-consuming and laborious. Especially for the nutrient solution supply of high-level water culture pools, workers need to repeatedly climb up and down. This not only consumes physical strength, but also has the risk of falling.

[0005] Therefore, it is urgent to propose a new automatic method for supplying nutrient solution to water culture pools to solve the above-mentioned problems of the traditional method. SUMMARY

[0006] The present application aims to provide a hydroponic liquid supply system to solve the problem that it is difficult to monitor and accurately supplement the nutrient solution in the existing water culture pool in time.

[0007] To solve the above technical problems, the present application provides a hydroponic liquid supply system, comprising at least one liquid level monitoring unit, a nutrient solution storage mechanism, a nutrient solution preparation mechanism and a nutrient solution control mechanism; the liquid level monitoring unit is arranged above the edge of each hydroponic pool and is in communication with the liquid outlet end of the nutrient solution storage mechanism, for monitoring the rise and fall of the liquid level in the hydroponic pool and automatically controlling the nutrient solution storage mechanism to deliver nutrient solution into the hydroponic pool; the nutrient solution storage mechanism comprises a nutrient solution storage cavity, a piston, a water pressure tank mechanism and a drainage water storage pool, the liquid inlet end of the nutrient solution storage cavity is in communication with the nutrient solution preparation mechanism, the piston is slidably arranged above the nutrient solution storage cavity and contacts the nutrient solution, the water pressure tank mechanism is arranged on the top of the piston and is in communication with the drainage water storage pool through a pipeline; the nutrient solution control mechanism comprises a motor lifting unit and a control circuit, the motor lifting unit is arranged above the nutrient solution storage mechanism and is connected to the top of the piston through a rope, and the motor lifting unit automatically controls the lifting of the piston through the control circuit.

[0008] In some embodiments, when the liquid level monitoring unit detects that the liquid level in the hydroponic pool falls, the control circuit drives the motor lifting unit to lower the piston to control the nutrient solution storage cavity to deliver nutrient solution into the hydroponic pool; when the liquid level monitoring unit detects that the liquid level in the hydroponic pool rises, the control circuit drives the motor lifting unit to pull up the piston to control the nutrient solution storage cavity to stop delivering nutrient solution into the hydroponic pool.

[0009] In some embodiments, the liquid level monitoring unit comprises a fixed support, a hole-connected connecting rod, a floating ball, a limiting sleeve, a positive water connecting rod, a positive water plug and a sliding support rod; the bottom of the fixed support is vertically fixed to the upper edge of the hydroponic pool, the top of the fixed support is rotatably connected to one end of the hole-connected connecting rod, the other end of the hole-connected connecting rod is arranged through the floating ball, and the floating ball floats on the liquid level of the hydroponic pool; the limiting sleeve is slidably arranged in the middle of the hole-connected connecting rod, the positive water connecting rod is arranged in parallel with the fixed support, one end of the positive water connecting rod is fixedly connected to the outer wall of the limiting sleeve, the other end of the positive water connecting rod is fixedly connected to the positive water plug, the positive water plug is a spherical structure and cooperates with the groove at the end of the pipeline in communication with the nutrient solution storage cavity; one end of the sliding support rod is slidably connected to the middle of the positive water connecting rod, and the other end of the sliding support rod is fixedly connected to the fixed support.

[0010] In some embodiments, the bottom of the nutrient solution storage cavity is in communication with each hydroponic pool through a pipeline via the liquid level monitoring unit; the piston is provided with an insulating pressure rod, an eye ring, an exhaust pipe and an exhaust valve, the insulating pressure rod and the eye ring are arranged on the top of the piston, the eye ring is connected to the motor lifting unit through a rope, the exhaust pipe is arranged through the piston, and the exhaust valve is arranged at the end of the exhaust pipe away from the nutrient solution storage cavity, for controlling the communication between the nutrient solution storage cavity and the external atmosphere.

[0011] In some embodiments, the water pressure tank mechanism comprises a water storage pressure tank, a water pump, a first water pipe and a second water pipe, the water storage pressure tank is arranged on the top of the piston and is communicated with the water pump through the first water pipe, the water pump is communicated with the water storage pool through the second water pipe, and the water amount in the water storage pressure tank is used to control the pressing force of the piston on the nutrient solution in the nutrient solution storage cavity.

[0012] In some embodiments, the motor lifting unit comprises a self-locking motor, a first rope winding drum, a second rope winding drum, a top iron ball and a bottom iron ball; the motor shaft of the self-locking motor is coaxially connected with the first rope winding drum and the second rope winding drum at both ends, the first rope winding drum is connected with the lifting ring on the piston through a rope, and the rope on the first rope winding drum is provided with the top iron ball penetrating through, the top iron ball is used to limit the highest point of the upward pulling of the piston, the second rope winding drum is connected with the bottom iron ball through a rope, and the bottom iron ball is used to limit the lowest point of the downward pulling of the piston; the lowest point of the bottom iron ball is not lower than the bottom level of the nutrient solution storage cavity.

[0013] In some embodiments, the control circuit comprises a self-locking motor upward pulling branch, a self-locking motor downward pulling branch, a water pressure tank water storage branch, a water pressure tank water discharge branch, a material mixing branch, a first spring switch and a second spring switch; the first spring switch is matched with the position of the insulating pressing rod on the top of the piston, when the piston is pulled up to the highest point, the insulating pressing rod abuts against the first spring switch and makes the first spring switch off, the self-locking motor downward pulling branch drives the self-locking motor to rotate and starts to pull down the piston, and the water pressure tank water storage branch drives the water pump in the water pressure tank mechanism to inject water into the water storage pressure tank; the second spring switch is matched with the position of the bottom iron ball of the motor lifting unit, when the piston is pulled down to the lowest point, the bottom iron ball is pulled up to the highest point and abuts against the second spring switch and makes the second spring switch off, the self-locking motor upward pulling branch drives the self-locking motor to rotate and starts to pull up the piston, and the water pressure tank water discharge branch drives the water pump in the water pressure tank mechanism to discharge water from the water storage pressure tank; the material mixing branch is electrically connected with the nutrient solution preparation mechanism and is used to control the nutrient solution preparation mechanism to mix and prepare the nutrient solution.

[0014] In some embodiments, the nutrient solution preparation mechanism comprises a material box, a stirring motor, stirring blades, a first feeding funnel, a second feeding funnel, a first valve, a second valve and a third valve; the stirring motor is coaxially connected with the stirring blades and is vertically arranged on the top of the material box, the first feeding funnel is communicated with the top of the material box, the first valve is arranged at the feeding port of the first feeding funnel and is used to control the feeding amount of the nutrient raw material, the second valve is arranged at the feeding port of the second feeding funnel and is used to control the water injection amount, and the third valve is arranged at the discharging port of the bottom of the material box, the discharging port of the bottom of the material box and the second feeding funnel are collected through a pipeline and are communicated with the liquid inlet of the nutrient solution storage cavity, and the nutrient raw material and water are mixed and prepared into the nutrient solution and are delivered to the nutrient solution storage cavity.

[0015] In some embodiments, the bottom level of the ingredient tank is higher than the top level of the nutrient solution storage cavity.

[0016] The beneficial effects of the present application are as follows:

[0017] 1) The system of the present application can sense the change of the amount of nutrient solution in the hydroponic tank through the floating ball and its matching components, and can automatically adjust and control the replenishment. When the nutrient solution level drops, the floating ball drops, and further triggers the corresponding response circuit, so that the positive water plug valve is opened; at the same time, the piston at the top of the nutrient solution storage cavity moves in the direction of reducing the volume, and then the nutrient solution is accurately replenished into the corresponding hydroponic tank. When the nutrient solution level in the hydroponic tank rises to the preset value, the floating ball and its matching components will trigger another response circuit, so that the positive water plug valve is closed, and the piston stops moving, thus completing the nutrient solution replenishment of the corresponding hydroponic tank.

[0018] 2) The system of the present application realizes the functions of quickly sensing the amount of nutrient solution in the hydroponic tank and timely and accurately replenishing, effectively solves the problems of high labor cost, high labor intensity and falling risk of workers in traditional manual replenishment, and is worth popularizing. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of not paying creative labor.

[0020] Fig. 1 is a structural schematic diagram of an embodiment of the hydroponic solution replenishment system in the present application;

[0021] Fig. 2 is a liquid level monitoring unit structure schematic diagram of an embodiment of the hydroponic solution replenishment system in the present application;

[0022] In the figure: 1-liquid level monitoring unit, 11-fixed support, 12-hole connecting rod, 13-floating ball, 14-limit sleeve, 15-positive water connecting rod, 16-positive water plug, 17-sliding support rod, 2-nutrient solution storage mechanism, 21-nutrient solution storage cavity, 22-piston, 221-insulating pressure rod, 222-suspender, 223-exhaust pipe, 224-exhaust valve, 23-water pressure tank mechanism, 231-water storage pressure tank, 232-water pump, 233-first water pipe, 234-second water pipe, 24-drainage water storage pool, 3-nutrient solution preparation mechanism, 31-preparation tank, 32-stirring motor, 33-stirring fan blade, 34-first feeding hopper, 35-second feeding hopper, 36-first valve, 37-second valve, 38-third valve, 4-nutrient solution control mechanism, 41-motor lifting unit, 411-self-locking motor, 412-first rope winding drum, 413-second rope winding drum, 414-top iron ball, 415-bottom iron ball, 42-control circuit, 421-self-locking motor up pull branch, 422-self-locking motor down branch, 423-water pressure tank water storage branch, 424-water pressure tank drainage branch, 425-preparation and stirring branch, 426-first spring switch, 427-second spring switch, 5-hydroponic pool. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the present specification and claims and the aforementioned description of the drawings are not intended to be all inclusive in terms of encompassing the full scope of the present application; the terms "comprising," "having," "including," and "containing" as used herein are meant to encompass the inclusion of any stated integer or group of integers without charging that the rest of the elements are thereby rendered optional.

[0025] Embodiment 1

[0026] Please refer to Figs. 1-2In the embodiment, the hydroponic solution supply system comprises at least one liquid level monitoring unit 1, a nutrient solution storage mechanism 2, a nutrient solution preparation mechanism 3, and a nutrient solution control mechanism 4. The liquid level monitoring unit 1 is arranged above the edge of each hydroponic pool 5 and is in communication with the liquid outlet end of the nutrient solution storage mechanism 2, is used for monitoring the rise and fall of the liquid level in the hydroponic pool, and is used for adaptively controlling the nutrient solution storage mechanism 2 to deliver nutrient solution into the hydroponic pool 5. The nutrient solution storage mechanism 2 comprises a nutrient solution storage cavity 21, a piston 22, a water pressure box mechanism 23, and a drainage water storage pool 24. The liquid inlet end of the nutrient solution storage cavity 24 is in communication with the nutrient solution preparation mechanism 4. The piston 22 is slidably arranged above the nutrient solution storage cavity 21 and contacts the nutrient solution. The water pressure box mechanism 23 is arranged on the top of the piston 22 and is in communication with the drainage water storage pool 24 through a pipeline. The nutrient solution control mechanism 4 comprises a motor lifting unit 41 and a control circuit 42. The motor lifting unit 41 is arranged above the nutrient solution storage mechanism 2 and is connected to the top of the piston 22 through a rope. The motor lifting unit 41 is adaptively controlled to lift or lower the piston through the control circuit 42. The components and their operating principles are described in detail below.

[0027] In the embodiment, the adaptive operation mode of the hydroponic solution supply system is as follows: when the liquid level monitoring unit 1 detects that the liquid level in the hydroponic pool 5 falls, the control circuit 42 drives the motor lifting unit 41 to lower the piston 22, so as to control the nutrient solution storage cavity 21 to deliver nutrient solution into the hydroponic pool 5. When the liquid level monitoring unit 1 detects that the liquid level in the hydroponic pool 5 rises, the control circuit 42 drives the motor lifting unit 41 to lift the piston 22, so as to control the nutrient solution storage cavity 21 to stop delivering nutrient solution into the hydroponic pool 5.

[0028] In the embodiment, referring to Fig. 2 , the liquid level monitoring unit comprises a fixed support 11, a hole-containing connecting rod 12, a floating ball 13, a limiting sleeve 14, a positive water connecting rod 15, a positive water plug 16, and a sliding support rod 17. The bottom of the fixed support 11 is vertically fixed to the upper edge of the hydroponic pool 5. The top of the fixed support 11 is rotatably connected to one end of the hole-containing connecting rod 12. The other end of the hole-containing connecting rod 12 is arranged through the floating ball 13, which floats on the liquid level of the hydroponic pool 5. The limiting sleeve 14 is slidably arranged in the middle of the hole-containing connecting rod 12. The positive water connecting rod 15 is arranged in parallel with the fixed support 11. One end of the positive water connecting rod 15 is fixedly connected to the outer wall of the limiting sleeve 14. The other end of the positive water connecting rod 15 is fixedly connected to the positive water plug 16, which is in spherical structure and cooperates with the groove at the end of the pipeline in communication with the nutrient solution storage cavity 21. One end of the sliding support rod 17 is slidably connected to the middle of the positive water connecting rod 15. The other end of the sliding support rod 17 is fixedly connected to the fixed support 11. Preferably, a buckle position for the sliding arrangement of the floating ball 13 is arranged on the hole-containing connecting rod 12, so as to facilitate the adjustment of the position of the floating ball 13 on the hole-containing connecting rod 12 to adapt to the liquid level requirement of the hydroponic pool of different heights. The linkage structure of the floating ball 13 and the positive water plug 16 is used to adjust whether the nutrient solution storage cavity 21 is filled with liquid when the liquid level of the hydroponic pool changes.

[0029] In this embodiment, the bottom of the nutrient solution storage chamber 21 is connected to each hydroponic tank 5 via a pipe through the liquid level monitoring unit 1; the piston 22 is provided with an insulating pressure rod 221, a lifting ring 222, an exhaust pipe 223 and an exhaust valve 224. The insulating pressure rod 221 and the lifting ring 222 are both located on the top of the piston 22. The lifting ring 222 is connected to the motor lifting unit 41 via a rope. The exhaust pipe 223 is installed through the piston 22. The exhaust valve 224 is located at the end of the exhaust pipe 223 away from the nutrient solution storage chamber 21, and is used to control the connection between the nutrient solution storage chamber 21 and the external atmosphere, so as to facilitate the adjustment of the internal pressure of the nutrient solution storage chamber 21.

[0030] In this embodiment, the water pressure tank mechanism 23 includes a water storage and pressure generation tank 231, a water pump 232, a first water pipe 233, and a second water pipe 234. The water storage and pressure generation tank 231 is disposed on the top of the piston 22 and is connected to the water pump 232 through the first water pipe 233. The water pump 232 is connected to the drainage water storage tank 24 through the second water pipe 233. The amount of water in the water storage and pressure generation tank 231 is used to regulate the pressure of the piston 22 on the nutrient solution in the nutrient solution storage chamber 21.

[0031] In this embodiment, the motor lifting unit 41 includes a self-locking motor 411, a first rope winding drum 412, a second rope winding drum 413, a top iron ball 414, and a bottom iron ball 415. The two ends of the motor shaft of the self-locking motor 41 are coaxially connected to the first rope winding drum 412 and the second rope winding drum 413, respectively. The first rope winding drum 412 is connected to the lifting ring 222 on the piston 22 through a rope, and the top iron ball 414 is provided through the rope on the first rope winding drum 412. The top iron ball 414 is used to limit the highest point of the piston pulling up. The second rope winding drum 413 is connected to the bottom iron ball 415 through a rope. The bottom iron ball 415 is used to limit the lowest point of the piston 22 descending. The lowest point of the bottom iron ball 415 is not lower than the bottom horizontal plane of the nutrient solution storage chamber 21.

[0032] In this embodiment, the control circuit 42 includes a self-locking motor pull-up branch 421, a self-locking motor lowering branch 422, a water pressure tank storage branch 423, a water pressure tank drainage branch 424, a batching and stirring branch 425, a first spring switch 426, and a second spring switch 427. The first spring switch 426 engages with the insulating pressure rod 221 at the top of the piston 22. When the piston 22 is pulled up to its highest point, the insulating pressure rod 221 abuts against the first spring switch 426, causing the first spring switch 426 to open. The self-locking motor lowering branch 422 drives the self-locking motor 411 to rotate and begins to lower the piston 22. The water pressure tank storage branch 423 drives the water pressure tank mechanism 23. The water pump 232 fills the water storage pressure tank 231 with water; the second spring switch 427 is engaged with the bottom iron ball 415 of the motor lifting unit 41. When the piston 22 is lowered to the lowest point, the bottom iron ball 415 is pulled up to the highest point, abutting the second spring switch 427 and causing the second spring switch 427 to open. The self-locking motor pull-up branch 421 drives the self-locking motor 411 to rotate and start pulling the piston 22 up. The water pressure tank drainage branch 424 drives the water pump 232 in the water pressure tank mechanism 23 to drain the water storage pressure tank 231. The ingredient mixing branch 425 is electrically connected to the nutrient solution preparation mechanism 3 and is used to control the nutrient solution preparation mechanism 3 to mix and prepare the nutrient solution. That is, the first spring switch 426 and the second spring switch 427 respectively realize the switching of the different operating modes of the self-locking motor 411 when the piston 22 is at the highest point and the lowest point, thereby realizing the switching of the operation of pulling up and lowering the piston 22.

[0033] In this embodiment, as Fig. 1 As shown, the self-locking motor pull-up branch 421 and the self-locking motor release branch 422 are preferably configured as a dual-control switch structure. Through the linkage of the dual-control switch structure, it is convenient to quickly switch between the two operations of the self-locking motor 411 driving the piston 22 to pull up and release. The water pressure tank storage branch 423 and the water pressure tank drainage branch 424 are preferably configured as a dual-control switch structure. Through the linkage of the dual-control switch structure, it is convenient to control the water pump 232 in the water pressure tank mechanism 23 to fill or drain water from the water pressure tank 231. At the same time, it is also linked with the self-locking motor 411 to control the pull-up and release operations of the piston 22. When the piston 22 is pulled up, it drains water from the water pressure tank 231. When the piston 22 is released, it fills water into the water pressure tank 231. This can further reduce the energy consumption of the self-locking motor 411 and reduce costs. Thus, real-time and rapid adjustment can be achieved for the dynamic changes of the hydroponic tank. Each circuit is equipped with a protective resistor to ensure its safety. A diode is connected in parallel at both the first and second spring switches to ensure unidirectional conduction of the corresponding circuit after switching. In other embodiments, other circuit configurations can be used to achieve the functions of the self-locking motor pull-up branch, self-locking motor release branch, water pressure tank storage branch, water pressure tank drainage branch, and batching and mixing branch, which will not be listed here.

[0034] In this embodiment, the nutrient solution preparation mechanism 3 includes a mixing tank 31, a stirring motor 32, a stirring blade 33, a first feeding funnel 34, a second feeding funnel 35, a first valve 36, a second valve 37, and a third valve 38. The stirring motor 32 is coaxially connected to the stirring blade 33 and is vertically installed on the top of the mixing tank 31. The first feeding funnel 34 is connected to the top of the mixing tank 31, and a first valve 36 is installed at the inlet of the first feeding funnel 34 to control the amount of nutrient raw materials added. A second valve 37 is installed at the inlet of the second feeding funnel 35 to control the amount of water injected. A third valve 38 is installed at the outlet at the bottom of the mixing tank 31. The outlet at the bottom of the mixing tank 31 and the second feeding funnel 35 are connected through a pipe and connected to the inlet of the nutrient solution storage chamber 21 to mix the nutrient raw materials with water to prepare the nutrient solution and transport it to the nutrient solution storage chamber. The bottom horizontal plane of the ingredient container 31 is higher than the top horizontal plane of the nutrient solution storage chamber 21, so as to facilitate the delivery of nutrient solution from the ingredient container 31 to the nutrient solution storage chamber 21.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

Claims

1. A hydroponic solution replenishment system, characterized in that, It includes at least one liquid level monitoring unit, a nutrient solution storage mechanism, a nutrient solution preparation mechanism, and a nutrient solution control mechanism; The liquid level monitoring unit is located at the upper edge of each hydroponic tank and is connected to the outlet end of the nutrient solution storage mechanism. It is used to monitor the rise and fall of the liquid level in the hydroponic tank and adaptively control the nutrient solution storage mechanism to deliver nutrient solution into the hydroponic tank. The nutrient solution storage mechanism includes a nutrient solution storage chamber, a piston, a hydraulic pressure tank mechanism, and a drainage storage tank. The inlet end of the nutrient solution storage chamber is connected to the nutrient solution preparation mechanism. The piston is slidably disposed above the nutrient solution storage chamber and in contact with the nutrient solution. The hydraulic pressure tank mechanism is disposed on the top of the piston and is connected to the drainage storage tank through a pipe. The nutrient solution control mechanism includes a motor lifting unit and a control circuit. The motor lifting unit is located above the nutrient solution storage mechanism and is connected to the top of the piston via a rope. The motor lifting unit adaptively controls the lifting of the piston through the control circuit.

2. The hydroponic solution replenishment system according to claim 1, characterized in that, When the liquid level monitoring unit detects a drop in the liquid level in the hydroponic tank, the control circuit drives the motor lifting unit to lower the piston, thereby controlling the nutrient solution storage chamber to deliver nutrient solution into the hydroponic tank. When the liquid level monitoring unit detects that the liquid level in the hydroponic tank is rising, the control circuit drives the motor lifting unit to pull up the piston, thereby controlling the nutrient solution storage chamber to stop supplying nutrient solution into the hydroponic tank.

3. The hydroponic solution replenishment system according to claim 1, characterized in that, The liquid level monitoring unit includes a fixed support, a perforated connecting rod, a float, a limiting sleeve, a positive water connecting rod, a positive water plug, and a sliding support rod; The bottom of the fixed support is vertically fixed to the upper edge of the hydroponic tank, and the top of the fixed support is rotatably connected to one end of the perforated connecting rod. The other end of the perforated connecting rod is through which the float is installed, and the float floats on the surface of the hydroponic tank liquid. The limiting sleeve is slidably sleeved on the middle of the perforated connecting rod. The positive water connecting rod is arranged parallel to the fixed support. One end of the positive water connecting rod is fixedly connected to the outer wall of the limiting sleeve, and the other end of the positive water connecting rod is fixedly connected to the positive water plug. The positive water plug has a spherical structure and cooperates with the end groove of the pipe that connects to the nutrient solution storage chamber. One end of the sliding support rod is slidably connected to the middle of the positive water connecting rod, and the other end of the sliding support rod is fixedly connected to the fixed support.

4. The hydroponic solution replenishment system according to claim 1, characterized in that, The bottom of the nutrient solution storage chamber is connected to each hydroponic tank via a pipe through the liquid level monitoring unit. The piston is equipped with an insulating pressure rod, a lifting ring, an exhaust pipe, and an exhaust valve. The insulating pressure rod and the lifting ring are both located on the top of the piston. The lifting ring is connected to the motor lifting unit via a rope. The exhaust pipe passes through the piston. The exhaust valve is located at the end of the exhaust pipe away from the nutrient solution storage chamber and is used to control the communication between the nutrient solution storage chamber and the external atmosphere.

5. The hydroponic solution replenishment system according to claim 1, characterized in that, The water pressure tank mechanism includes a water storage pressure tank, a water pump, a first water pipe, and a second water pipe. The water storage pressure tank is located on top of the piston and is connected to the water pump through the first water pipe. The water pump is connected to the drainage storage tank through the second water pipe. The amount of water in the water storage pressure tank is used to regulate the pressure exerted by the piston on the nutrient solution in the nutrient solution storage chamber.

6. The hydroponic solution replenishment system according to claim 5, characterized in that, The motor lifting unit includes a self-locking motor, a first rope winding drum, a second rope winding drum, a top iron ball, and a bottom iron ball; The self-locking motor has its motor shaft coaxially connected to the first and second rope winding drums respectively. The first rope winding drum is connected to the lifting ring on the piston via a rope, and the top iron ball is threaded through the rope on the first rope winding drum. The top iron ball is used to limit the highest point of the piston's upward movement. The second rope winding drum is connected to the bottom iron ball via a rope. The bottom iron ball is used to limit the lowest point of the piston's downward movement. The lowest point of the bottom iron ball is not lower than the bottom horizontal plane of the nutrient solution storage cavity.

7. The hydroponic solution replenishment system according to claim 6, characterized in that, The control circuit includes a self-locking motor pull-up branch, a self-locking motor release branch, a water pressure tank storage branch, a water pressure tank drainage branch, a batching and mixing branch, a first spring switch, and a second spring switch. The first spring switch engages with the insulating pressure rod at the top of the piston. When the piston is pulled up to its highest point, the insulating pressure rod abuts against the first spring switch and causes the first spring switch to open. The self-locking motor lowering branch drives the self-locking motor to rotate and begins to lower the piston. The water pressure tank storage branch drives the water pump in the water pressure tank mechanism to fill the water pressure tank with water. The second spring switch is matched with the position of the bottom iron ball of the motor lifting unit. When the piston is lowered to the lowest point, the bottom iron ball is pulled up to the highest point to abut against the second spring switch and make the second spring switch open. The self-locking motor pull-up branch drives the self-locking motor to rotate and start pulling up the piston. The water pressure tank drainage branch drives the water pump in the water pressure tank mechanism to drain the water storage pressure tank. The mixing branch is electrically connected to the nutrient solution preparation mechanism and is used to control the nutrient solution preparation mechanism to mix and prepare the nutrient solution.

8. The hydroponic solution replenishment system according to claim 1, characterized in that, The nutrient solution preparation mechanism includes a mixing tank, a stirring motor, stirring blades, a first feeding funnel, a second feeding funnel, a first valve, a second valve, and a third valve; The stirring motor is coaxially connected to the stirring fan blade and is vertically installed on the top of the ingredient box. The first feeding funnel is connected to the top of the ingredient box, and the first valve is installed at the feeding port of the first feeding funnel to control the amount of nutrient raw materials added. The second valve is installed at the inlet of the second feed funnel to control the amount of water injected; The third valve is provided at the discharge port at the bottom of the mixing tank. The discharge port at the bottom of the mixing tank and the second feeding funnel are connected through a pipe and communicate with the inlet of the nutrient solution storage chamber. This is used to mix the nutrient raw materials with water to prepare the nutrient solution and transport it to the nutrient solution storage chamber.

9. The hydroponic solution replenishment system according to claim 8, characterized in that, The bottom level of the ingredient container is higher than the top level of the nutrient solution storage chamber.

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