Layered hydroponic pool nutrient solution supply system

Abstract

The invention relates to the field of agricultural planting, in particular to a layered hydroponic pool nutrient solution supply system which comprises at least one liquid level height maintaining mechanism, at least one sliding switch mechanism and a nutrient solution adding control mechanism, and the liquid level height maintaining mechanism is connected with the nutrient solution adding control mechanism through the sliding switch mechanism. Opening and closing of the infusion valve and starting and stopping of the nutrient solution adding control mechanism can be controlled according to lifting of the floating body, and nutrient solution supply is achieved through cooperation of all the mechanisms. According to the layered water planting device, the effects that nutrient solution supply can be automatically and accurately conducted on the layered water planting pool, nutrient supply needed by growth of the water planting plants is guaranteed, meanwhile, control is achieved through a mechanical structure, and the cost and maintenance problems caused by intelligent control are reduced are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural hydroponic cultivation, and particularly to a nutrient solution supply system for a layered hydroponic tank. Background Art

[0002] In modern agricultural production, the hydroponic cultivation technology has developed rapidly. Due to its many advantages such as saving land, efficiently utilizing resources, and facilitating precise control of the plant growth environment, it has received extensive attention and application. The hydroponic cultivation mode breaks the limitations of traditional soil cultivation, can achieve large-scale cultivation in a limited space, effectively improves the yield and quality of agricultural products, and promotes the progress of agriculture towards modernization and industrialization. At the same time, this cultivation method reduces the impact of soil pollution and pests and diseases, making agricultural products greener and healthier, meeting the current consumers' demand for high-quality food.

[0003] In terms of nutrient solution supply for hydroponic tanks, the commonly used methods in the past include manual supply, that is, manually checking the liquid level of the hydroponic tank regularly, and then manually adding nutrient solution according to experience and observation. This method relies on manual operation. Although it is simple and direct, for large-scale hydroponic cultivation, the workload is huge and it requires a large amount of labor cost. There is also a timed supply method, which adds nutrient solution to the hydroponic tank at a preset time interval by setting a timer. This method reduces the manual burden to a certain extent, but since it cannot adjust in real time according to the actual consumption of the nutrient solution in the hydroponic tank, it is easy to cause the situation of adding too much or too little nutrient solution. In addition, the sensor-controlled supply method is also relatively common. It uses a liquid level sensor to sense the liquid level height in the hydroponic tank, and automatically starts the nutrient solution adding device when the liquid level is lower than the set value. However, this method requires complex electronic equipment and control systems, with high costs, and the accuracy and stability of the sensor are easily affected by environmental factors such as water quality and temperature.

[0004] These existing nutrient solution supply methods for hydroponic tanks have obvious defects. The manual supply method is not only inefficient and difficult to meet the needs of large-scale cultivation, but also easily causes untimely nutrient solution supply due to human negligence. The timed supply method lacks flexibility and cannot adjust dynamically according to actual consumption, which may result in nutrient solution waste or insufficient supply, affecting the normal growth of plants. The sensor-controlled supply method is relatively intelligent, but has high equipment costs, difficult maintenance, and is seriously interfered by environmental factors, with poor reliability. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a nutrient solution supply system for a layered hydroponic tank, which can automatically add nutrient solution to the hydroponic tank.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A hierarchical hydroponic tank nutrient solution supply system includes at least one liquid level height maintaining mechanism, at least one sliding switch mechanism, and a nutrient solution addition control mechanism, where

[0008] The liquid level height maintaining mechanism is connected to the nutrient solution addition control mechanism through the sliding switch mechanism;

[0009] The liquid level height maintaining mechanism includes a floating body, an infusion pipeline, an infusion valve, and a valve control circuit; the floating body is arranged in the hydroponic tank, the liquid outlet of the infusion pipeline is located above the hydroponic tank, and the infusion valve is arranged on the infusion pipeline;

[0010] When the floating body descends, the valve control circuit controls the infusion valve to open and drives the sliding switch mechanism to close so that the nutrient solution addition control mechanism adds nutrient solution into the hydroponic tank;

[0011] When the floating body ascends, the valve control circuit controls the infusion valve to close and drives the sliding switch mechanism to disconnect so that the nutrient solution addition control mechanism stops adding nutrient solution into the hydroponic tank.

[0012] Optionally, the liquid level height maintaining mechanism further includes a connecting rod, a conductive sleeve, a valve control motor, a transmission gear, and a rack, where

[0013] The conductive sleeve is fixedly arranged;

[0014] The connecting rod is vertically slidably arranged in the conductive sleeve. The connecting rod sequentially includes an upper conductive rod body, an upper insulating rod body, a lower conductive rod body, and a lower insulating rod body from top to bottom. The lower insulating rod body is fixedly arranged on the floating body;

[0015] The valve control motor is fixedly arranged, the transmission gear is connected to the rotating shaft of the valve control motor, the rack is meshed with the transmission gear, and the rack is in transmission connection with the infusion valve;

[0016] The valve control circuit is electrically connected to the valve control motor, the upper conductive rod body, the lower conductive rod body, and the conductive sleeve; when the upper conductive rod body contacts the conductive sleeve, the control circuit controls the valve control motor to drive the infusion valve to open; when the lower conductive rod body contacts the conductive sleeve, the control circuit controls the valve control motor to drive the infusion valve to close.

[0017] Optionally, the valve control circuit includes a power supply, an infusion switch, a first normally closed spring switch, a second normally closed spring switch, a first electromagnet, a second electromagnet, a first protection resistor, a second protection resistor, a third normally closed spring switch, and a fourth normally closed spring switch; where

[0018] The positive pole of the power supply is electrically connected to the infusion switch and the conductive sleeve;

[0019] The upper conductive rod, the valve control motor, the second protective resistor, the fourth normally closed spring switch, the first electromagnet, the second normally closed spring switch and the negative electrode of the power supply are electrically connected;

[0020] The valve control motor, the second electromagnet, the third normally closed spring switch and the lower conductive rod are electrically connected;

[0021] The upper conductive rod, the first protective resistor, the third normally closed spring switch and the negative electrode of the power supply are electrically connected;

[0022] The first electromagnet is arranged opposite to the third normally closed spring switch; the second electromagnet is arranged opposite to the fourth normally closed spring switch.

[0023] Optionally, an insulating lever is provided on the rack, the first normally closed spring switch and the second normally closed spring switch are arranged at intervals, and the insulating lever is provided between the first normally closed spring switch and the second normally closed spring switch.

[0024] Optionally, the nutrient solution addition control mechanism includes a containing chamber, a piston, a push rod, a liquid injection control motor, a driving gear and a liquid injection control circuit, wherein

[0025] The accommodating chamber is fixedly arranged, a liquid outlet is formed at one end of the accommodating chamber, a mounting port is formed at the other end, and a feeding port is formed on the cavity wall of the accommodating chamber;

[0026] The piston sliding seal is arranged inside the accommodating cavity;

[0027] The push rod is fixedly mounted on the end surface of the piston away from the liquid outlet, and a transmission tooth is formed on the surface of the push rod;

[0028] The liquid injection control motor is fixedly arranged, the driving gear is connected to the rotating shaft of the liquid injection control motor, and the driving gear is meshed with the transmission teeth on the push rod;

[0029] The injection control circuit is electrically connected to the injection control motor; when the piston moves to the liquid outlet, the injection control circuit controls the injection control motor to drive the piston away from the liquid outlet; when the piston moves to the installation port, the injection control circuit controls the injection control motor to drive the piston close to the liquid outlet.

[0030] Optionally, the injection control circuit includes a forward injection switch, a reverse injection switch, a first protection resistor, a second protection resistor, a first normally closed spring switch, and a second normally closed spring switch; wherein

[0031] The positive electrode of the power supply, the first protective resistor, the first normally closed spring switch, the positive terminal of the injection control motor, the negative terminal of the injection control motor, the positive injection switch and the negative electrode of the power supply are electrically connected in sequence;

[0032] The positive pole of the power supply, the second protection resistor, the second normally closed spring switch, the negative terminal of the injection control motor, the positive terminal of the injection control motor, the reverse injection switch and the negative pole of the power supply are electrically connected.

[0033] Optionally, the sliding switch mechanism includes a slider, a slide rail, a push-pull rod, two insulating rotating rods and two conductive rigid rods, wherein

[0034] the slide rail is fixedly arranged;

[0035] the slider is slidably mounted on the slide rail;

[0036] One end of the push-pull rod is fixedly connected to the rack, and the other end is fixedly connected to the slider;

[0037] One end of each conductive rigid rod is rotatably mounted on the slider through a corresponding insulating rotating rod;

[0038] A first contact and a second contact are disconnectedly arranged between the positive pole of the power supply and the first protection resistor. One end of a conductive rigid rod is fixedly connected to the first contact, and a conductive rigid rod is operably connected or disconnected from the second contact;

[0039] A third contact and a fourth contact are disconnectedly arranged between the negative pole of the power supply and the forward liquid injection switch. One end of the other conductive rigid rod is fixedly connected to the third contact, and the other conductive rigid rod is operably connected or disconnected from the fourth contact.

[0040] Optionally, the first normally closed spring switch is installed at one end of the accommodating cavity, and the second normally closed spring switch is installed at the other end of the accommodating cavity; at the ends of the toggle levers of the first normally closed spring switch and the second normally closed spring switch, first magnets are fixedly installed. The same magnetic poles of the two first magnets face the accommodating cavity. A second magnet is installed on the piston, and the magnetic pole of the second magnet facing the first magnet is the same as the magnetic pole of the first magnet facing the accommodating cavity.

[0041] Optionally, the nutrient solution addition control mechanism further includes a solution addition component. The solution addition component includes a mixer, a blanking pipe, a first ball valve, a water injection funnel and a second ball valve. A feeding funnel is connected to the upper end of the mixer; the blanking pipe is inclined. The upper end of the blanking pipe is connected to the lower end of the mixer, and the lower end of the blanking pipe is communicated with the feeding port; the water injection funnel is communicatively arranged in the middle of the blanking pipe; the first ball valve and the second ball valve are respectively installed at the lower end of the mixer and the lower end of the water injection funnel.

[0042] Optionally, the liquid injection control circuit further includes a sliding rheostat, an ammeter and a second switch. The sliding rheostat, the ammeter and the second switch are connected in series to the power supply, and the sliding terminal of the sliding rheostat is fixedly connected to the push rod.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. It can automatically control the addition of nutrient solution according to the liquid level height in the hydroponic tank, avoiding the problems of low efficiency of manual replenishment method, difficulty in meeting the needs of large-scale planting and easy untimely replenishment due to human negligence;

[0045] 2. It can adjust the addition amount in real time according to the actual consumption of the nutrient solution in the hydroponic tank, overcoming the defects of the timed supply method, such as lack of flexibility, easy waste or insufficient supply of the nutrient solution.

[0046] 3. It does not require complex electronic devices and control systems, reducing costs and being free from interference of environmental factors such as water quality and temperature, improving the reliability of nutrient solution supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0048] Figure 1 It is a schematic structural diagram of the nutrient solution supply system for the layered hydroponic tank of the present invention;

[0049] Figure 2 It is a circuit diagram for controlling the opening of the infusion valve of the present invention;

[0050] Figure 3 It is a circuit diagram for controlling the closing of the infusion valve of the present invention;

[0051] Figure 4 It is a circuit diagram for the positive rotation injection of the liquid injection control motor of the present invention;

[0052] Figure 5 It is a circuit diagram for the reverse rotation and retraction of the liquid injection control motor of the present invention.

[0053] In the figure: 1. floating body; 2. connecting rod; 3. conductive sleeve; 4. infusion pipeline; 5. infusion valve; 6. valve control motor; 7. transmission gear; 8. rack; 9. power supply; 10. infusion switch; 11. first normally closed spring switch; 12. second normally closed spring switch; 13. first electromagnet; 14. second electromagnet; 15. first protection resistor; 16. second protection resistor; 17. third normally closed spring switch; 18. fourth normally closed spring switch; 19. insulating lever; 20. support seat; 21. adjusting rod; 22. upper conductive rod body; 23. upper insulating rod body; 24. lower conductive rod body; 25. lower insulating rod body; 26. accommodating cavity; 27. piston; 28. push rod; 29. liquid injection control motor; 30. driving gear; 31. liquid outlet; 32. installation port; 33. feeding port; 34. forward liquid injection switch; 35. reverse liquid injection switch; 36. first protection resistor; 37. second protection resistor; 38. first normally closed spring switch; 39. second normally closed spring switch; 40. first magnet; 41. second magnet; 42. mixer; 43. blanking pipe; 44. first ball valve; 45. water injection funnel; 46. second ball valve; 47. feeding funnel; 48. first switch; 49. sliding rheostat; 50. ammeter; 51. second switch; 52. slider; 53. slide rail; 54. push-pull rod; 55. insulating rotating rod; 56. conductive rigid rod; 57. first contact; 58. second contact; 59. third contact; 60. fourth contact. Specific embodiments

[0054] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] Embodiment 1

[0056] Combined with Figure 1 As shown, a nutrient solution replenishment system for a layered hydroponic pool disclosed in an embodiment of the present invention includes at least one liquid level height maintaining mechanism, at least one sliding switch mechanism, and a nutrient solution addition control mechanism, wherein the liquid level height maintaining mechanism is connected to the nutrient solution addition control mechanism through the sliding switch mechanism; the liquid level height maintaining mechanism includes a floating body 1, an infusion pipeline 4, an infusion valve 5, and a valve control circuit; the floating body 1 is arranged in the hydroponic pool, the liquid outlet of the infusion pipeline 4 is located above the hydroponic pool, and the infusion valve 5 is arranged on the infusion pipeline 4; when the floating body 1 descends, the valve control circuit controls the infusion valve 5 to open, and drives the sliding switch mechanism to close so that the nutrient solution addition control mechanism adds nutrient solution into the hydroponic pool; when the floating body 1 ascends, the valve control circuit controls the infusion valve 5 to close, and drives the sliding switch mechanism to disconnect so that the nutrient solution addition control mechanism stops adding nutrient solution into the hydroponic pool.

[0057] Specifically, the liquid level height maintaining mechanism of this embodiment further includes a connecting rod 2, a conductive sleeve 3, a valve control motor 6, a transmission gear 7, a rack 8, and a valve control circuit. The floating body 1 is arranged in the liquid and moves up and down with the rise and fall of the liquid level. The conductive sleeve 3 is fixedly arranged. The connecting rod 2 is vertically slidably arranged in the conductive sleeve 3 and can perform linear up and down movement along the conductive sleeve 3, achieving the beneficial effect of driving the connecting rod 2 to slide in the conductive sleeve 3 through the change of the liquid level height. This is because the floating body 1 is connected to the connecting rod 2, and the rise and fall of the liquid level will directly cause the rise and fall of the floating body 1, thereby driving the connecting rod 2 to slide in the conductive sleeve 3.

[0058] The liquid outlet of the infusion pipeline 4 is located above the hydroponic tank, facilitating the inflow of liquid into the hydroponic tank. The infusion valve 5 is arranged on the infusion pipeline 4 and is used to control the on-off of the liquid in the infusion pipeline 4. The valve control motor 6 is fixedly arranged. The transmission gear 7 is connected to the rotating shaft of the valve control motor 6, and the rack 8 is engaged with the transmission gear 7. When the valve control motor 6 rotates, through the meshing transmission of the transmission gear 7 and the rack 8, the rotational motion can be converted into linear motion to drive the opening and closing of the infusion valve 5.

[0059] The valve control circuit is electrically connected to the valve control motor 6, the upper conductive rod body, the lower conductive rod body, and the conductive sleeve 3, and can control the operation of the valve control motor 6 according to the contact situation between the conductive rod body and the conductive sleeve 3, thereby controlling the opening and closing of the infusion valve 5, and finally realizing the maintenance of the liquid level height. For example, when the upper conductive rod body contacts the conductive sleeve 3, the control circuit controls the valve control motor 6 to drive the infusion valve 5 to open; when the lower conductive rod body contacts the conductive sleeve 3, the control circuit controls the valve control motor 6 to drive the infusion valve 5 to close.

[0060] Specifically, the floating body 1 includes a floating ball or other objects with sufficient buoyancy, such as a cylindrical floating barrel. The floating ball is generally made of hollow plastic material, which has a small density, large buoyancy, and corrosion resistance, can float well on the liquid surface, and will not be corroded by the liquid after long-term use. The shape of the floating ball is usually spherical, so the resistance in the liquid is small, and it can move up and down more flexibly with the fluctuation of the liquid level. The cylindrical floating barrel can be made of metal material and is wrapped with an anti-corrosion coating on the outside. It is suitable for maintaining the liquid level height of some large hydroponic tanks. Because of its large surface area, it can better adapt to the large-scale change of the liquid level. The floating body 1 is arranged in the liquid and can stably float on the liquid surface and move synchronously with the rise or fall of the liquid level.

[0061] Specifically, the connecting rod 2 successively includes an upper conductive rod body, an upper insulating rod body, a lower conductive rod body, and a lower insulating rod body from top to bottom. The lower insulating rod body is fixedly arranged on the floating body 1. The upper conductive rod body is generally made of copper material. Copper has good electrical conductivity and can ensure the smooth transmission of current. Its shape is usually cylindrical and the surface is smooth to reduce the friction force when sliding in the conductive sleeve 3. The upper insulating rod body can be made of rubber material. Rubber has good insulation performance and can effectively isolate current to prevent electric leakage. The upper insulating rod body is tightly connected to the upper conductive rod body and can be fixed together by means of socket connection or bonding to form an integral whole. The lower conductive rod body is also made of copper material and has the same electrical conductivity and structural characteristics as the upper conductive rod body. The lower insulating rod body is made of plastic material, with a hard texture and good insulation performance. The fixing method of the lower insulating rod body to the floating body 1 can be threaded connection. The lower insulating rod body is screwed into a specific screw hole of the floating body 1 to ensure the stability of the connection. The connecting rod 2 as a whole makes a vertical sliding movement in the conductive sleeve 3, realizing the function of moving up and down in the conductive sleeve 3 as the floating body 1 rises and falls.

[0062] Specifically, the conductive sleeve 3 is generally made of metal material, such as stainless steel. Stainless steel not only has good electrical conductivity but also has strong corrosion resistance and can adapt to various liquid environments. The inner wall of the conductive sleeve 3 is polished to reduce the friction coefficient with the connecting rod 2, enabling the connecting rod 2 to slide more smoothly therein. The conductive sleeve 3 is fixedly arranged through structures such as brackets to ensure the stability of its position and prevent it from shaking or displacing due to external factors.

[0063] Specifically, the infusion pipeline 4 can be a plastic pipeline or a metal pipeline. Plastic pipelines such as PVC pipes have the advantages of light weight, low price, and corrosion resistance; metal pipelines such as steel pipes have the characteristics of high strength and good pressure resistance. The liquid outlet of the infusion pipeline 4 is located above the liquid level to ensure that the liquid can flow smoothly into the hydroponic tank. The infusion valve 5 can be a ball valve or a gate valve. In this embodiment, a ball valve is used. The ball valve has a fast opening and closing speed and good sealing performance; the gate valve has a large flow regulation range and can more accurately control the liquid flow rate. The infusion valve 5 of this embodiment is installed on the infusion pipeline 4. A gear is fixedly installed at one end of the ball valve. The ball valve is meshed with the rack 8 through the gear, and through cooperation with the valve control motor 6, the on-off control of the liquid in the infusion pipeline 4 is realized.

[0064] Furthermore, the valve control motor 6 of this embodiment is a self-locking motor, which can automatically lock its position after stopping rotation to prevent misoperation caused by external interference. It usually adopts a permanent magnet DC motor, which has the advantages of small volume, high efficiency, good speed regulation performance, etc. The valve control motor 6 is fixedly arranged by means of bolts, etc., to ensure the accuracy and stability of its position. The transmission gear 7 is key-connected to the rotating shaft of the valve control motor 6 to ensure synchronous rotation between the two. The transmission gear 7 is generally made of alloy steel, which has high strength and wear resistance. The rack 8 meshes with the transmission gear 7. The rack 8 is also made of alloy steel, and its tooth profile design should match the tooth profile of the transmission gear 7 to ensure the smoothness and accuracy of transmission.

[0065] Combined Figures 2 to 3 As shown, the valve control circuit of this embodiment includes a power supply 9, an infusion switch 10, a first normally closed spring switch 11, a second normally closed spring switch 12, a first electromagnet 13, a second electromagnet 14, a first protection resistor 15, a second protection resistor 16, a third normally closed spring switch 17, and a fourth normally closed spring switch 18. The positive pole of the power supply 9 is electrically connected to the infusion switch 10 and the conductive sleeve 3. The upper conductive rod body, the valve control motor 6, the second protection resistor 16, the fourth normally closed spring switch 18, the first electromagnet 13, the second normally closed spring switch 12, and the negative pole of the power supply 9 are electrically connected. The valve control motor 6, the second electromagnet 14, the third normally closed spring switch 17, and the lower conductive rod body are electrically connected. The upper conductive rod body, the first protection resistor 15, the third normally closed spring switch 17, and the negative pole of the power supply 9 are electrically connected. The first electromagnet 13 and the third normally closed spring switch 17 are arranged opposite to each other. The second electromagnet 14 and the fourth normally closed spring switch 18 are arranged opposite to each other. It is easy to understand that the connection sequence of each component can be adjusted according to actual needs, and this embodiment does not make specific restrictions.

[0066] In addition, an insulating dial rod 19 is arranged on the rack 8. The first normally closed spring switch 11 and the second normally closed spring switch 12 are arranged at intervals. The insulating dial rod 19 is arranged between the first normally closed spring switch 11 and the second normally closed spring switch 12. When the rack 8 moves, the insulating dial rod 19 will move with the rack 8. When the insulating dial rod 19 touches the first normally closed spring switch 11 or the second normally closed spring switch 12, it will change the state of the spring switch, thereby affecting the on-off of the circuit.

[0067] The specific control principle of this embodiment is as follows: Closing the infusion switch 10 activates the entire circuit. At this time, the nutrient solution level has not dropped, and the insulating lever 19 touches the first normally closed spring switch 11 to make it open; when the nutrient solution level drops, the upper conductive rod body comes into contact with the conductive sleeve 3, and the branch circuit of the positive pole of the power supply 9, the infusion switch 10, the conductive sleeve 3, the upper conductive rod body, the valve control motor 6, the second protection resistor 16, the fourth normally closed spring switch 18, the first electromagnet 13, the second normally closed spring switch 12, and the negative pole of the power supply 9 is conducted; there is no current generated in the branch circuit where the valve control motor 6, the second electromagnet 14, the first normally closed spring switch 11, and the lower conductive rod body are connected; and because the first electromagnet 13 generates magnetic force, the third normally closed spring switch 17 is opened, and there is also no current generated in the branch circuit where the upper conductive rod body, the first protection resistor 15, the third normally closed spring switch 17, and the negative pole of the power supply 9 are connected. At this time, the valve control motor 6 rotates forward to drive the rack 8 to move in the direction close to the second normally closed spring switch 12, and the infusion valve 5 gradually opens; when the infusion valve 5 is completely opened, the insulating lever 19 touches the second normally closed spring switch 12 to make it open, and the branch circuit of the positive pole of the power supply 9, the infusion switch 10, the conductive sleeve 3, the upper conductive rod body, the valve control motor 6, the second protection resistor 16, the fourth normally closed spring switch 18, the first electromagnet 13, the second normally closed spring switch 12, and the negative pole of the power supply 9 loses current, and a current is generated in the branch circuit where the upper conductive rod body, the first protection resistor 15, the third normally closed spring switch 17, and the negative pole of the power supply 9 are connected to form a protection circuit, and the valve control motor 6 stops rotating and self-locks; at this time, the liquid can be transported into the hydroponic tank through the infusion pipeline 4 to raise the liquid level.

[0068] When the liquid level of the nutrient solution rises, the lower conductive rod body contacts the conductive sleeve 3, and a current is generated in the branch circuit connecting the positive pole of the power supply 9, the infusion switch 10, the conductive sleeve 3, the lower conductive rod body, the first normally closed spring switch 11, the second electromagnet 14, the valve control motor 6, the first protection resistor 15, the third normally closed spring switch 17, and the negative pole of the power supply 9 to form a circuit; while the second normally closed spring switch 12 is also touched and disconnected by the insulating lever 19, so no current is generated in the branch circuit of the second protection resistor 16, the fourth normally closed spring switch 18, the first electromagnet 13, the second normally closed spring switch 12, and the negative pole of the power supply 9; the current flowing through the valve control motor 6 is opposite to that when the liquid level drops, so the valve control motor 6 rotates in reverse to drive the rack 8 to move towards the direction close to the first normally closed spring switch 11, and the infusion valve 5 gradually closes; when the infusion valve 5 is completely closed, the insulating lever 19 touches the first normally closed spring switch 11 to disconnect it, and the valve control motor 6 stops rotating and locks itself; at this time, the infusion pipeline 4 stops delivering liquid to the hydroponic tank. It should be noted that when the valve control motor 6 rotates in reverse to drive the rack 8 to move towards the direction close to the first normally closed spring switch 11, although the insulating lever 19 leaves the second normally closed spring switch 12, the magnetic force generated by the second electromagnet 14 disconnects the fourth normally closed spring switch 18, so no current is still generated in the branch circuit of the second protection resistor 16, the fourth normally closed spring switch 18, the first electromagnet 13, the second normally closed spring switch 12, and the negative pole of the power supply 9. When the liquid level drops again, the above process will be repeated to achieve automatic control of the liquid level height.

[0069] Combined with Figures 1 to 3 As shown, the liquid level height maintaining mechanism of this embodiment further includes a support seat 20 and an adjusting rod 21. The support seat 20 is fixedly arranged, and the adjusting rod 21 is horizontally slidably arranged on the support group, and the conductive sleeve 3 is fixedly connected to the adjusting rod 21.

[0070] Furthermore, the lower insulating rod body is formed with a plurality of pin holes from top to bottom. The lower insulating rod body is inserted into the middle of the floating body 1, and both the upper and lower ends of the floating body 1 are fixed by inserting pins into the pin holes.

[0071] The nutrient solution addition control mechanism of this embodiment will be described in detail below.

[0072] The nutrient solution addition control mechanism disclosed in the embodiment of the present invention includes a receiving cavity 26, a piston 27, a push rod 28, a liquid injection control motor 29, a driving gear 30, and a liquid injection control circuit, wherein

[0073] The accommodating chamber 26 is fixedly arranged, and the piston 27 is slidably and sealingly arranged inside the accommodating chamber 26; the push rod 28 is fixedly installed on the end surface of the piston 27 facing away from the liquid outlet 31, and transmission teeth are formed on the surface of the push rod 28; the liquid injection control motor 29 is fixedly arranged, the driving gear 30 is connected to the rotating shaft of the liquid injection control motor 29, and the driving gear 30 meshes with the transmission teeth on the push rod 28; the liquid injection control motor 29 drives the push rod 28 through the driving gear 30 to move the piston 27 in the accommodating chamber 26, and the liquid injection control circuit is electrically connected to the liquid injection control motor 29, and can control the rotation direction of the motor according to the position of the piston 27, achieving the effect of accurately controlling the amount of solution added and avoiding the interference of human factors and the influence of environmental factors. Because through motor drive and circuit control, the piston 27 can be moved according to the set stroke, and then accurately suck and discharge a fixed amount of solution.

[0074] Specifically, the accommodating chamber 26 is fixedly arranged, one end of which forms a liquid outlet 31, the liquid outlet 31 is communicated with the infusion pipeline 4, the other end forms an installation port 32, and a feeding port 33 is formed on the chamber wall. The accommodating chamber 26 is generally made of metal or high-strength plastic, and its shape is usually cylindrical to facilitate the sliding of the piston 27. Of course, it can also be designed into other shapes according to actual needs, such as square. The liquid outlet 31 is used to discharge the solution into the target container, and the opening size thereof should be determined according to the fluidity of the solution and the required discharge speed. The installation port 32 should ensure enough space for installing components such as the piston 27 and the push rod 28. The position and size of the feeding port 33 are determined according to actual needs, and it is generally located on the side of the chamber wall to facilitate the addition of the solution. In some cases, the accommodating chamber 26 can also be made of special materials such as ceramics to adapt to solutions with higher requirements for chemical reaction stability.

[0075] Furthermore, the piston 27 is slidably and sealingly arranged inside the accommodating chamber 26. The piston 27 is usually cylindrical, and its outer diameter is adapted to the inner diameter of the accommodating chamber 26 to achieve good sliding and sealing effects. The surface of the piston 27 can be made of a smooth material, such as a polytetrafluoroethylene coating, to reduce the friction with the inner wall of the accommodating chamber 26 and improve the sealing performance at the same time. To further enhance the sealing effect, a rubber sealing ring can also be arranged at the edge of the piston 27. Of course, in some special application scenarios, a piston 27 made of silicone material can also be used to meet different chemical property requirements.

[0076] Furthermore, the push rod 28 is generally made of a metal material, such as aluminum alloy, to ensure its strength and rigidity. The transmission teeth are evenly distributed on the surface of the push rod 28, and its shape and size should match the driving gear 30, and the common one is the involute tooth profile. The connection mode between the push rod 28 and the piston 27 can be threaded connection or bonding to ensure the stable connection between the two. In some occasions with higher requirements for weight, a push rod 28 made of carbon fiber material can also be used to reduce the overall weight of the device.

[0077] Furthermore, the liquid injection control motor 29 is usually a stepper motor, which can precisely control the rotation angle and speed, thereby achieving precise control of the moving distance of the piston 27. The driving gear 30 is generally made of steel and has high hardness and wear resistance. The driving gear 30 and the rotating shaft of the liquid injection control motor 29 can be connected by a key to ensure synchronous rotation. The meshing clearance between the driving gear 30 and the transmission teeth on the push rod 28 should be appropriate. Excessive clearance may cause unstable transmission, while too small clearance will increase wear. In some special cases, a servo motor can also be used instead of the stepper motor to obtain higher control accuracy.

[0078] Furthermore, the liquid injection control circuit of this embodiment is electrically connected to the liquid injection control motor 29;

[0079] Combined Figure 2 and Figure 3 As shown, the liquid injection control circuit of this embodiment includes a forward liquid injection switch 34, a reverse liquid injection switch 35, a first protection resistor 36, a second protection resistor 37, a first normally closed spring switch 38, and a second normally closed spring switch 39; the positive pole of the power supply 9, the first protection resistor 36, the first normally closed spring switch 38, the positive terminal of the liquid injection control motor 29, the negative terminal of the liquid injection control motor 29, the forward liquid injection switch 34, and the negative pole of the power supply 9 are electrically connected in sequence; the positive pole of the power supply 9, the second protection resistor 37, the second normally closed spring switch 39, the negative terminal of the liquid injection control motor 29, the positive terminal of the liquid injection control motor 29, the reverse liquid injection switch 35, and the negative pole of the power supply 9 are electrically connected. By closing and opening the switches, the forward and reverse rotation of the liquid injection control motor 29 is controlled, thereby achieving the purpose of controlling the movement direction of the piston 27.

[0080] Specifically, the forward liquid injection switch 34 and the reverse liquid injection switch 35 are used to control the current flow direction and determine the rotation direction of the motor. The first protection resistor 36 and the second protection resistor 37 play a current limiting role to prevent excessive current from damaging the motor and other components. The first normally closed spring switch 38 and the second normally closed spring switch 39 automatically close or open according to the position of the piston 27 to achieve automatic control of the motor operation.

[0081] Furthermore, the first normally closed spring switch 38 of this embodiment is installed at one end of the accommodation cavity 26, and the second normally closed spring switch 39 is installed at the other end of the accommodation cavity 26; at the ends of the levers of the first normally closed spring switch 38 and the second normally closed spring switch 39, first magnets 40 are fixedly installed, and the same magnetic poles of the two first magnets 40 face the accommodation cavity 26. A second magnet 41 is installed on the piston 27, and the magnetic pole of the second magnet 41 facing the first magnet 40 is the same as the magnetic pole of the first magnet 40 facing the accommodation cavity 26. When the piston 27 approaches, the switches act through the principle of like poles repelling each other of the magnets.

[0082] The implementation principle of this embodiment is as follows: When it is necessary to add a solution externally, close the forward liquid injection switch 34 to conduct the circuit of the positive pole of the power supply 9, the first protection resistor 36, the first normally closed spring switch 38, the positive terminal of the liquid injection control motor 29, the negative terminal of the liquid injection control motor 29, the forward liquid injection switch 34, and the negative pole of the power supply 9. At this time, the liquid injection control motor 29 rotates forward to push the piston 27 towards the liquid outlet 31. When the piston 27 approaches the first normally closed spring switch 38, the second magnet 41 repels the first magnet 40 to disconnect the first normally closed spring switch 38, and the liquid injection control motor 29 stops rotating; at this time, the solution in the accommodation chamber 26 is just added up, and it is necessary to retract the piston 27 to re - configure the solution in the accommodation chamber 26; at this time, disconnect the forward liquid injection switch 34 and close the reverse liquid injection switch 35. The liquid injection control motor 29 rotates in the reverse direction to push the piston 27 towards the installation port 32, and the solution can be configured into the accommodation chamber 26 through the feeding port 33.

[0083] Combined Figure 1 As shown, the nutrient solution addition control mechanism of this embodiment further includes a solution addition component. The solution addition component includes a stirrer 42, a feeding pipe 43, a first ball valve 44, a water injection funnel 45, and a second ball valve 46. The upper end of the stirrer 42 is connected with a feeding funnel 47; the feeding pipe 43 is inclined. The upper end of the feeding pipe 43 is connected to the lower end of the stirrer 42, and the lower end of the feeding pipe 43 is communicated with the feeding port 33; the water injection funnel 45 is communicated and arranged in the middle of the feeding pipe 43; the first ball valve 44 and the second ball valve 46 are respectively installed at the lower end of the stirrer 42 and the lower end of the water injection funnel 45.

[0084] Specifically, the stirrer 42 is composed of a stirring motor, stirring paddles, and a stirring barrel. The stirring motor drives the stirring paddles to rotate to fully stir the added raw materials to make them evenly mixed. The shape and quantity of the stirring paddles are designed according to actual needs, and common ones are propeller - type and turbine - type. The stirring barrel is generally made of stainless steel material, which has good corrosion resistance. The feeding funnel 47 is used to add raw materials into the stirrer 42, and its opening is large, which is convenient for operation.

[0085] The feeding pipe 43 is inclined, so that the stirred solution can flow smoothly into the accommodation chamber 26 by gravity. The feeding pipe 43 generally adopts a pipe - shaped structure, and its inner diameter is determined according to the flow rate and viscosity of the solution. The first ball valve 44 is installed at the lower end of the stirrer 42 to control the stirred solution to enter the feeding pipe 43; the second ball valve 46 is installed at the lower end of the water injection funnel 45 to control the water injection volume. The advantage of the ball valve is that it is convenient to operate, has good sealing performance, and can accurately control the on - off and flow rate of the fluid.

[0086] Further, the stirrer 42 is electrically connected to the power supply 9, and a first switch 48 is connected in series between the stirrer 42 and the power supply 9 to control the start and stop of the stirring motor through the first switch 48.

[0087] Further, the liquid injection control circuit of this embodiment further includes a sliding rheostat 49, an ammeter 50, and a second switch 51. The sliding rheostat 49, the ammeter 50, and the second switch 51 are connected in series to the power supply 9, and the sliding terminal of the sliding rheostat 49 is fixedly connected to the push rod 28. Connecting the sliding rheostat 49, the ammeter 50, and the second switch 51 in series to the power supply 9 and fixedly connecting the sliding terminal of the sliding rheostat 49 to the push rod 28 can reflect the remaining amount of the solution in the accommodating cavity 26 through the reading of the ammeter 50.

[0088] The sliding switch mechanism of this embodiment will be described in detail below.

[0089] Combined with Figure 1 As shown, in this embodiment, the sliding switch mechanism realizes automatically controlling the nutrient solution adding control mechanism to perform the nutrient solution adding action after the infusion valve 4 is fully opened, and realizes the nutrient solution adding control mechanism to stop the nutrient solution adding action after the infusion valve 4 is fully closed.

[0090] Specifically, the sliding switch mechanism includes a slider 52, a slide rail 53, a push-pull rod 54, two insulating rotating rods 55, and two conductive rigid rods 56. The slide rail 53 is fixedly arranged and can be installed on a suitable bracket. The slider 52 is slidably installed on the slide rail 53, and the slider 52 can freely slide on the slide rail 53. One end of the push-pull rod 54 is fixedly connected to the rack, and the other end is fixedly connected to the slider 52. When the rack moves, it will drive the slider 52 to slide on the slide rail 53 through the push-pull rod 54. One end of each conductive rigid rod 56 is rotatably installed on the slider 52 through the corresponding insulating rotating rod 55. The insulating rotating rod 55 plays an insulating role to prevent current short circuit. A first contact 57 and a second contact 58 are disconnectedly arranged between the positive pole of the power supply 9 and the first protection resistor 36. One end of a conductive rigid rod 56 is fixedly connected to the first contact 57, and a conductive rigid rod 56 can be operably connected or disconnected from the second contact 58; a third contact 59 and a fourth contact 60 are disconnectedly arranged between the negative pole of the power supply 9 and the forward liquid injection switch 34. The other end of the other conductive rigid rod 56 is fixedly connected to the third contact 59, and the other conductive rigid rod 56 can be operably connected or disconnected from the fourth contact 60. By sliding the slider 52, it drives the conductive rigid rod 56 to be connected and disconnected from the corresponding contacts, thereby controlling the on-off of the liquid injection control circuit.

[0091] That is to say, when the insulating lever 19 touches the second normally closed spring switch 12 and makes it open, at this time, the slider 52 slides to a conductive hard rod 56 communicating with the second contact 58, and the other conductive hard rod 56 communicating with the fourth contact 60; at this time, the positive electrode of the power supply 9, a conductive hard rod 56, the second contact 58, the first protection resistor 36, the first normally closed spring switch 38, the positive connector of the liquid injection control motor 29, the negative connector of the liquid injection control motor 29, the forward liquid injection switch 34, the fourth contact 60, the other conductive hard rod 56 and the negative electrode of the power supply 9 form a conductive circuit, and at this time, the liquid injection control motor 29 rotates forward to push the piston 27 to move towards the liquid outlet 31 to add nutrient solution.

[0092] When the liquid level of the nutrient solution rises, the insulating lever 19 will touch the first normally closed spring switch 11 and make it open. At this time, the slider 52 slides to a conductive hard rod 56 disconnecting from the second contact 58, and the other conductive hard rod 56 disconnecting from the fourth contact 60; at this time, the positive electrode of the power supply 9, a conductive hard rod 56, the second contact 58, the first protection resistor 36, the first normally closed spring switch 38, the positive connector of the liquid injection control motor 29, the negative connector of the liquid injection control motor 29, the forward liquid injection switch 34, the fourth contact 60, the other conductive hard rod 56 and the negative electrode of the power supply 9 lose current, and the liquid injection control motor 29 stops injecting liquid.

[0093] It is easy to understand that when there is a layered hydroponic tank, a liquid level height maintaining mechanism and a sliding switch mechanism can be set for each layer of the hydroponic tank. The liquid level height maintaining mechanism and the sliding switch mechanism on each hydroponic tank can independently control the operation of the nutrient solution adding control mechanism to add nutrient solution to the corresponding hydroponic tank.

[0094] In the attached drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0095] The above is only the preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A nutrient solution supply system for a layered hydroponic tank, characterized in that: Comprising at least one liquid level maintaining mechanism, at least one sliding switch mechanism and a nutrient solution adding control mechanism, wherein the liquid level maintaining mechanism is connected to the nutrient solution adding control mechanism through the sliding switch mechanism; the liquid level maintaining mechanism includes a floating body, an infusion pipeline, an infusion valve and a valve control circuit; the floating body is arranged in the hydroponic tank, the liquid outlet of the infusion pipeline is located above the hydroponic tank, and the infusion valve is arranged on the infusion pipeline; when the floating body descends, the valve control circuit controls the infusion valve to open and drives the sliding switch mechanism to close so that the nutrient solution adding control mechanism adds nutrient solution into the hydroponic tank; when the floating body ascends, the valve control circuit controls the infusion valve to close and drives the sliding switch mechanism to disconnect so that the nutrient solution adding control mechanism stops adding nutrient solution into the hydroponic tank.

2. The nutrient solution supply system for the layered hydroponic pool according to claim 1, wherein: The liquid level maintaining mechanism further includes a connecting rod, a conductive sleeve, a valve control motor, a transmission gear and a rack, wherein the conductive sleeve is fixedly arranged; the connecting rod is vertically slidably arranged in the conductive sleeve. The connecting rod sequentially includes an upper conductive rod body, an upper insulating rod body, a lower conductive rod body and a lower insulating rod body from top to bottom, and the lower insulating rod body is fixedly arranged on the floating body; the valve control motor is fixedly arranged, the transmission gear is connected to the rotating shaft of the valve control motor, the rack is engaged with the transmission gear, and the rack is in transmission connection with the infusion valve; the valve control circuit is electrically connected to the valve control motor, the upper conductive rod body, the lower conductive rod body and the conductive sleeve; when the upper conductive rod body contacts the conductive sleeve, the control circuit controls the valve control motor to drive the infusion valve to open; when the lower conductive rod body contacts the conductive sleeve, the control circuit controls the valve control motor to drive the infusion valve to close.

3. The nutrient solution supply system for the layered hydroponic tank according to claim 2, wherein: The valve control circuit includes a power supply, an infusion switch, a first normally closed spring switch, a second normally closed spring switch, a first electromagnet, a second electromagnet, a first protection resistor, a second protection resistor, a third normally closed spring switch, and a fourth normally closed spring switch; wherein the positive pole of the power supply is electrically connected to the infusion switch and the conductive sleeve; the upper conductive rod body, the valve control motor, the second protection resistor, the fourth normally closed spring switch, the first electromagnet, the second normally closed spring switch and the negative pole of the power supply are electrically connected; the valve control motor, the second electromagnet, the third normally closed spring switch and the lower conductive rod body are electrically connected; the upper conductive rod body, the first protection resistor, the third normally closed spring switch and the negative pole of the power supply are electrically connected; the first electromagnet and the third normally closed spring switch are arranged opposite to each other; the second electromagnet and the fourth normally closed spring switch are arranged opposite to each other.

4. The layered hydroponic pond nutrient solution supply system according to claim 3, wherein: An insulating shift lever is arranged on the rack, the first normally closed spring switch and the second normally closed spring switch are arranged at intervals, and the insulating shift lever is arranged between the first normally closed spring switch and the second normally closed spring switch.

5. The layered hydroponic tank nutrient solution supply system according to claim 3, characterized in that: The nutrient solution adding control mechanism includes a receiving cavity, a piston, a push rod, a liquid injection control motor, a driving gear, and a liquid injection control circuit, where the receiving cavity is fixedly arranged, one end of the receiving cavity forms a liquid outlet, the other end forms an installation opening, and a feeding opening is formed on the cavity wall of the receiving cavity; the piston is slidably and sealingly arranged inside the receiving cavity; the push rod is fixedly installed on the end surface of the piston facing away from the liquid outlet, and transmission teeth are formed on the surface of the push rod; the liquid injection control motor is fixedly arranged, the driving gear is connected to the rotating shaft of the liquid injection control motor, and the driving gear meshes with the transmission teeth on the push rod; the liquid injection control circuit is electrically connected to the liquid injection control motor; when the piston moves to the liquid outlet, the liquid injection control circuit controls the liquid injection control motor to drive the piston away from the liquid outlet; when the piston moves to the installation opening, the liquid injection control circuit controls the liquid injection control motor to drive the piston close to the liquid outlet.

6. The layered hydroponic tank nutrient solution supply system according to claim 5, characterized in that: The liquid injection control circuit includes a forward liquid injection switch, a reverse liquid injection switch, a first protection resistor, a second protection resistor, a first normally closed spring switch, and a second normally closed spring switch; where the positive electrode of the power supply, the first protection resistor, the first normally closed spring switch, the positive terminal of the liquid injection control motor, the negative terminal of the liquid injection control motor, the forward liquid injection switch, and the negative electrode of the power supply are electrically connected in sequence; the positive electrode of the power supply, the second protection resistor, the second normally closed spring switch, the negative terminal of the liquid injection control motor, the positive terminal of the liquid injection control motor, the reverse liquid injection switch, and the negative electrode of the power supply are electrically connected.

7. The layered hydroponic pond nutrient solution supply system according to claim 6, characterized in that: The sliding switch mechanism includes a slider, a slide rail, a push-pull rod, two insulating rotating rods, and two conductive rigid rods, where the slide rail is fixedly arranged; the slider is slidably installed on the slide rail; one end of the push-pull rod is fixedly connected to the rack, and the other end is fixedly connected to the slider; one end of each conductive rigid rod is rotatably installed on the slider through a corresponding insulating rotating rod; a first contact and a second contact are disconnectedly arranged between the positive electrode of the power supply and the first protection resistor, one end of one conductive rigid rod is fixedly connected to the first contact, and one conductive rigid rod can be operably connected to or disconnected from the second contact; a third contact and a fourth contact are disconnectedly arranged between the negative electrode of the power supply and the forward liquid injection switch, one end of the other conductive rigid rod is fixedly connected to the third contact, and the other conductive rigid rod can be operably connected to or disconnected from the fourth contact.

8. The layered hydroponic pond nutrient solution supply system according to claim 6, characterized in that: The first normally closed spring switch is installed at one end of the receiving cavity, and the second normally closed spring switch is installed at the other end of the receiving cavity; first magnets are fixedly installed at the ends of the toggle rods of the first normally closed spring switch and the second normally closed spring switch, the same magnetic poles of the two first magnets face the receiving cavity, a second magnet is installed on the piston, and the magnetic pole of the second magnet facing the first magnet is the same as the magnetic pole of the first magnet facing the receiving cavity.

9. The layered hydroponic tank nutrient solution supply system according to claim 8, characterized in that: The nutrient solution addition control mechanism further includes a solution addition component. The solution addition component includes a mixer, a feeding pipe, a first ball valve, a water injection funnel, and a second ball valve. A feeding funnel is connected to the upper end of the mixer; the feeding pipe is arranged obliquely, the upper end of the feeding pipe is connected to the lower end of the mixer, and the lower end of the feeding pipe is communicated with the feeding port; the water injection funnel is communicated and arranged in the middle of the feeding pipe; the first ball valve and the second ball valve are respectively installed at the lower end of the mixer and the lower end of the water injection funnel.

10. The layered hydroponic pond nutrient solution supply system according to claim 8, characterized in that: The liquid injection control circuit further includes a sliding rheostat, an ammeter, and a second switch. The sliding rheostat, the ammeter, and the second switch are connected in series to the power supply, and the sliding terminal of the sliding rheostat is fixedly connected to the push rod.

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