Water and fertilizer online proportioning device based on EC and pH detection method

Abstract

The utility model relates to an EC and pH detection method-based water and fertilizer online proportioning device, which comprises a fertilizer preparation module, a pH regulation and control module, a mixed application module and a control module, and is characterized in that the fertilizer preparation module comprises nutrient solution tanks and fertilizer preparation tanks arranged one to one with the nutrient solution tanks; the pH regulation and control module comprises an acid liquid tank and an alkali liquid tank and is connected with the fertilizer mixing tank through a liquid injection pipeline; the mixed application module comprises a fertilizer mixing tank as well as a fertilizer injection pipeline and a fertilizer application pipeline which are connected with the fertilizer mixing tank, a pH sensor is arranged in the fertilizer mixing tank, and the fertilizer mixing tank is connected with the fertilizer preparation tank and the liquid injection pipeline through a multi-channel fertilizer injection pump; and the control module comprises a control box, and a liquid level sensor, an electromagnetic valve and a flow meter which are connected with the control box. Different types of single-component fertilizer solutions are prepared on the basis of a conductivity method, then the single-component fertilizer solutions are equivalently extracted through a four-channel fertilizer injection pump to be mixed, any mixed fertilizer solution containing different types and contents of nutrient components can be accurately prepared on line, the fertilizer mixing efficiency is higher, and meanwhile the actual irrigation and fertilization requirements of crops are better met.

Description

Technical Field

[0001] This application relates to the technical field of water and fertilizer mixing, and particularly to an online water and fertilizer proportioning device based on EC and pH detection methods. Background Art

[0002] Precise water and fertilizer management is an important part in promoting the scientific, intelligent, information-based and sustainable development of modern agriculture. For a long time, China has faced problems such as large agricultural water consumption and low fertilizer utilization efficiency in the field of agricultural irrigation and fertilization, which has led to low economic benefits of agricultural production and serious ecological environment pollution. The integrated water and fertilizer technology is the key to realizing precise water and fertilizer management, and the water and fertilizer integrated machine developed based on this technology can achieve precise proportioning and supply of water and fertilizers, playing a significant role in improving the utilization efficiency of water and fertilizers, promoting crop yield increase and bumper harvest, and protecting the ecological environment, thus being widely used in fields such as agricultural irrigation and fertilization.

[0003] Most water and fertilizer integrated machines can only reflect the total ion concentration and total pH information in the fertilizer solution, and cannot achieve online detection of the content of each nutrient component in the mixed fertilizer solution. Therefore, they can only configure single-component fertilizer solutions, with low fertilizer mixing efficiency and difficult to meet the actual growth needs of crops. Although emerging online detection methods for fertilizer solution component information such as ion selective electrode method and spectral analysis method can achieve precise detection of the content of each nutrient component in the mixed fertilizer solution, they have disadvantages such as high price, complex operation, and being easily interfered by the external environment, and are difficult to be widely promoted and applied in the field of agricultural irrigation and fertilization. Summary of the Utility Model

[0004] To solve or partially solve the problems existing in the related technologies, this application provides an online water and fertilizer proportioning device based on EC and pH detection methods. Based on EC and pH detection technologies, it realizes online and precise configuration of multi-nutrient component mixed fertilizer solutions, and at the same time, in the process of irrigation and fertilization, it conducts real-time and online detection and regulation of the pH value of the fertilizer solution, so as to ensure that the pH value of the fertilizer solution is within the tolerance range of the crops.

[0005] The first aspect of this application provides an online water and fertilizer proportioning device based on EC and pH detection methods, including:

[0006] A fertilizer mixing module, including a nutrient solution tank and a fertilizer mixing tank arranged one-to-one with the nutrient solution tank. The fertilizer mixing tank is connected to the nutrient solution tank through a nutrient solution pipeline and to a water source through a water inlet pipeline. An electrical conductivity sensor and a stirring device are arranged in the fertilizer mixing tank;

[0007] A pH regulation module, including an acid solution tank and an alkali solution tank, which are connected to a mixed fertilizer tank through a liquid injection pipeline;

[0008] The mixing and application module includes a mixed-fertilizer tank and a fertilization pipeline connected to the mixed-fertilizer tank. A stirring device and a pH sensor are arranged in the mixed-fertilizer tank, and it is connected to a fertilizer preparation tank and a liquid injection pipeline through a multi-channel fertilizer injection pump.

[0009] The control module includes a control box and a liquid level sensor, a solenoid valve, and a flow meter connected to the control box. The liquid level sensor is installed in the nutrient solution tank, the fertilizer preparation tank, and the mixed-fertilizer tank. The solenoid valve is installed on the water inlet pipeline, the liquid injection pipeline, the fertilizer injection pipeline, and the fertilization pipeline. A flow meter is also installed on the fertilization pipeline. The control box is also connected to the stirring device, the conductivity sensor, the multi-channel fertilizer injection pump, and the pH sensor.

[0010] Among them, a touch display screen is arranged on the outer wall of the control box, and a controller, a voltage stabilizing circuit, and an audible and visual alarm are arranged inside the control box.

[0011] Among them, two liquid level sensors for detecting the highest liquid level and the lowest liquid level are installed on the outer walls of the fertilizer preparation tank and the mixed-fertilizer tank.

[0012] Among them, a fertilizer suction pump, a water suction pump, and a fertilizer solution pump are correspondingly installed on the nutrient solution pipeline, the water inlet pipeline, and the fertilization pipeline.

[0013] Among them, there are 3 nutrient solution tanks for storing high-concentration nutrient solutions of different types and single components, and the multi-channel fertilizer injection pump is a four-channel fertilizer injection pump.

[0014] The technical solution provided by this application may include the following beneficial effects:

[0015] This application provides a water and fertilizer online proportioning device based on EC and pH detection methods. It adopts the method of "preparing first and then mixing", that is, first preparing single-component fertilizer solutions of different types based on the conductivity method, and then equally extracting each single-component fertilizer solution through a four-channel fertilizer injection pump for mixing. Therefore, it can accurately and online configure mixed fertilizer solutions containing any different types and contents of nutrient components. While the mixing efficiency is higher, it is more in line with the actual irrigation and fertilization requirements of crops. During the process of preparing and mixing fertilizers, the device also regulates the pH value of the water and fertilizer mixture to make the pH value of the irrigation fertilizer solution within the tolerance range of the crops, which is conducive to the full absorption of nutrients by the crops.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0017] By describing the exemplary embodiments of this application in more detail in combination with the drawings, the above and other objects, features, and advantages of this application will become more obvious. Among them, in the exemplary embodiments of this application, the same reference numerals generally represent the same components.

[0018] Figure 1It is a schematic structural diagram of the device shown in the embodiments of the present application;

[0019] Figure 2 It is a schematic control diagram of the device shown in the embodiments of the present application;

[0020] Figure 3 It is a schematic diagram of the fuzzy PID control box of the device shown in the embodiments of the present application;

[0021] Reference numerals:

[0022] In the figure: 1 - control box; 101 - touch display screen; 102 - STM32 single-chip microcomputer; 103 - 24V voltage stabilizing circuit; 104 - 3.3V voltage stabilizing circuit; 105 - sound and light alarm; 2 - nutrient solution tank; 201 - first liquid level sensor; 3 - nutrient solution pipeline; 301 - fertilizer suction pump; 302 - nutrient solution injection inlet; 4 - water inlet pipeline; 401 - water inlet; 402 - water suction pump; 403 - first electromagnetic valve; 5 - fertilizer mixing tank; 501 - conductivity sensor; 502 - first electric stirrer; 503 - second liquid level sensor; 504 - third liquid level sensor; 6 - fertilizer injection pipeline; 601 - four-channel fertilizer injection pump; 602 - second electromagnetic valve; 603 - fertilizer injection port; 7 - fertilizer mixing tank; 701 - pH sensor; 702 - second electric stirrer; 703 - fourth liquid level sensor; 704 - fifth liquid level sensor; 8 - pH regulation module; 801 - acid solution tank; 802 - alkali solution tank; 803 - third electromagnetic valve; 804 - fourth electromagnetic valve; 805 - liquid injection pipeline; 9 - fertilization pipeline; 901 - fertilizer liquid pump; 902 - fifth electromagnetic valve; 903 - flowmeter; 904 - fertilizer outlet. Detailed implementation manners

[0023] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0025] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present 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, and therefore should not be construed as a limitation to the present application.

[0026] Unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.

[0028] As Figure 1 shown, a water and fertilizer online proportioning device based on an EC and pH detection method includes: a control box 1, a nutrient solution tank 2, a fertilizer mixing tank 5, a fertilizer blending tank 7, a pH regulation module 8, a water inlet pipe 4, a nutrient solution pipe 3, a fertilizer injection pipe 6, and a fertilization pipe 9.

[0029] The outer wall of the control box 1 is provided with a touch display screen 101 for setting fertilization parameter information and real-time monitoring of the operation status of the device; inside the control box 1, there are a controller (STM32 single-chip microcomputer 102), a 24V voltage stabilizing circuit 103, a 3.3V voltage stabilizing circuit 104, and an audible and visual alarm 105. The controller is the control core of the entire device. The 24V voltage stabilizing circuit 103 provides the power required for the normal operation of the touch display screen 101 and various sensors. The audible and visual alarm 105 is used to emit an alarm signal in case of emergency; the input end of the control box 1 is connected to a 220V AC power supply, and the output end is connected to the water suction pump 402, each fertilizer suction pump 301, a four-channel fertilizer injection pump 601, a fertilizer solution pump 901, the power supply ends of each electromagnetic valve, each electric stirrer, and the audible and visual alarm 105, as well as the input end of the 24V voltage stabilizing circuit 103. The output end of the 24V voltage stabilizing circuit 103 is connected to the power supply ends of the touch display screen 101, a conductivity sensor 501, a pH sensor 701, each liquid level sensor, and a flow meter 903, as well as the input end of the 3.3V voltage stabilizing circuit 104. The output end of the 3.3V voltage stabilizing circuit 104 is connected to the power supply end of the controller, as Figure 2 shown.

[0030] There are a total of 3 nutrient solution tanks 2, which are used to store high-concentration nutrient solutions of different types and single components; a first liquid level sensor 201 is provided on the outer wall of each nutrient solution tank 2 for detecting the low liquid level of the nutrient solution in the tank. When the liquid level in the nutrient solution tank 2 is lower than the set liquid level, the device automatically stops running and sends an alarm signal through the sound and light alarm 105 to remind the user to replenish the nutrient solution in time.

[0031] The fertilizer mixing tank 5 is a place for precisely configuring and storing single-component fertilizer solutions of a set concentration; an electrical conductivity sensor 501 and a first electric stirrer 502 are provided inside the fertilizer mixing tank 5, which are used to detect the electrical conductivity information of the single-component fertilizer solution in real time and online and to achieve full mixing between water and the nutrient solution respectively; a second liquid level sensor 503 and a third liquid level sensor 504 are provided on the outer wall of the fertilizer mixing tank 5. Among them: the second liquid level sensor 503 is set at an appropriate position below the tank opening for high liquid level alarm to avoid the situation of fertilizer solution overflow during the fertilizer mixing process, and the third liquid level sensor 504 is set at an appropriate position above the probe of the electrical conductivity sensor 501 to ensure that the liquid level in the fertilizer mixing tank 5 is always higher than the probe position, so that the electrical conductivity sensor 501 can work normally.

[0032] The fertilizer blending tank 7 is a place for full mixing of each single-component fertilizer solution and pH regulation of the fertilizer solution; a pH sensor 701 and a second electric stirrer 702 are provided inside the fertilizer blending tank 7, which are used to detect the pH information of the water-fertilizer mixture in real time and online and to achieve full mixing between each single-component fertilizer solution respectively; a fourth liquid level sensor 703 and a fifth liquid level sensor 704 are provided on the outer wall of the fertilizer blending tank 7. Among them: the fourth liquid level sensor 703 is set at an appropriate position below the tank opening for high liquid level alarm to avoid the situation of fertilizer solution overflow, and the fifth liquid level sensor 704 is set at an appropriate position above the probe of the pH sensor 701 to ensure that the liquid level in the fertilizer blending tank 7 is always higher than the probe position, so that the pH sensor 701 can work normally.

[0033] The pH regulation module 8 includes an acid solution tank 801, an alkali solution tank 802, a third solenoid valve 803, a fourth solenoid valve 804 and a liquid injection pipeline 805; the acid solution tank 801 and the alkali solution tank 802 are used to store acid solution and alkali solution; one end of the third solenoid valve 803 and the fourth solenoid valve 804 is connected to the acid solution tank 801 and the alkali solution tank 802, and the other end is connected to the liquid injection pipeline 805.

[0034] A water pump 402 and a first solenoid valve 403 are provided on the water inlet pipeline 4, which are used to pump the external water source into the fertilizer mixing tank 5 and to automatically control the on-off of the water inlet pipeline 4 respectively; the water inlet 401 of the water inlet pipeline 4 is connected to the inlet end of the water pump 402, the outlet end of the water pump 402 is connected to the inlet of the first solenoid valve 403, the outlet of the first solenoid valve 403 extends into the fertilizer mixing tank 5 through a pipeline, and the end of the water inlet pipeline 4 is the water inlet 401.

[0035] There are a total of 3 nutrient solution pipelines 3, which are respectively used to transport high-concentration nutrient solutions of different types and single components; a fertilizer suction pump 301 is arranged on each nutrient solution pipeline 3 for pumping the corresponding nutrient solution; one end of the nutrient solution pipeline 3 is connected to the inside of the nutrient solution tank 2, and the other end is connected to the inlet end of the fertilizer suction pump 301. The outlet end of the fertilizer suction pump 301 extends into the fertilizer mixing tank 5 through a pipeline, and the end of the nutrient solution pipeline 3 is the nutrient solution injection inlet 302.

[0036] A four-channel fertilizer injection pump 601 and a second solenoid valve 602 are arranged on the fertilizer injection pipeline 6, which are respectively used to extract each single-component fertilizer solution and acid / alkali solution and automatically control the on / off of the fertilizer injection pipeline 6; three inlet channels of the four-channel fertilizer injection pump 601 are respectively connected to the bottom outlets of the three fertilizer mixing tanks 5, and are used to pump the single-component fertilizer solutions in each fertilizer mixing tank 5 into the fertilizer mixing tank 7 at the same rated flow rate. Its last inlet channel is connected to the liquid injection pipeline 805 and is used to extract the acid solution / alkali solution into the fertilizer mixing tank 7. The outlet end of the four-channel fertilizer injection pump 601 is connected to the inlet of the second solenoid valve 602, and the outlet of the second solenoid valve 602 extends into the fertilizer mixing tank 7 through a pipeline. The end of the fertilizer injection pipeline 6 is the fertilizer injection port 603.

[0037] A fertilizer solution pump 901, a fifth solenoid valve 902 and a flow meter 903 are arranged on the fertilizer application pipeline 9, which are respectively used to extract the water-fertilizer mixture in the fertilizer mixing tank 7, automatically control the on / off of the fertilizer application pipeline 9 and detect the cumulative flow rate of the water-fertilizer mixture; one end of the fertilizer application pipeline 9 is connected to the bottom outlet of the fertilizer mixing tank 7, and the other end is connected to the inlet end of the fertilizer solution pump 901. The outlet end of the fertilizer solution pump 901 is connected to the inlet of the fifth solenoid valve 902, the outlet of the fifth solenoid valve 902 is connected to the inlet end of the flow meter 903, and the outlet end of the flow meter 903 is the fertilizer outlet 904.

[0038] The device adopts a "fixed water variable fertilizer" control strategy, that is, the flow rate of the water suction pump 402 is fixed, and the flow rates of the respective fertilizer suction pumps 301 are dynamically changed, and the control of the flow rates of the respective fertilizer suction pumps 301 is independent of each other and does not affect each other; the conductivity values of the respective single-component fertilizer solutions are selected as the controlled quantities, and the operating frequencies of the respective fertilizer suction pumps 301 are the control quantities; a fuzzy PID controller is designed, including a fuzzy control part and a PID control part, where: the input of the fuzzy control part is the deviation (e = r - y) between the set value (r) and the actual detected value (y) of the conductivity of each single-component fertilizer solution and the change rate ec of the conductivity deviation, and the output is the increments ΔKp, ΔKi, ΔKd of Kp, Ki, Kd. Through fuzzy reasoning, the three input parameters of the PID control part are self-tuned to obtain Kp = Kp0 + ΔKp, Ki = Ki0 + ΔKi, Kd = Kd0 + ΔKd, and its output (u) is used as a control signal to act on each fertilizer suction pump 301. By dynamically changing the operating frequencies of the respective fertilizer suction pumps 301, the injection amounts of the respective nutrient solutions are changed, and finally the conductivity (concentration) of each single-component fertilizer solution reaches the set value, as Figure 3 shown.

[0039] Fertilizer mixing section: The main task is to prepare a single-component fertilizer solution with a set concentration. This section is divided into a detection part, a control part, and an execution part. A first liquid level sensor 201 is installed on the outer wall of each nutrient solution tank 2 for detecting the low liquid level of the nutrient solution. When the liquid level of the nutrient solution in the tank is lower than the set value, the device automatically stops running and sends an alarm signal through the sound and light alarm 105 to remind the user to replenish the nutrient solution in time. The water suction pump 402 and three fertilizer suction pumps 301 are respectively used to pump external water sources and corresponding nutrient solutions into the fertilizer mixing tank 5. The first electromagnetic valve 403 is used to automatically control the on / off of the water inlet pipe 4. The fertilizer mixing tank 5 is used to prepare and store a single-component fertilizer solution with a set concentration, and is internally equipped with a conductivity sensor 501 and a first electric stirrer 502, which are respectively used to on-line detect the conductivity information of the fertilizer solution and achieve the full mixing of water and the nutrient solution. The outer wall of the fertilizer mixing tank 5 is equipped with a second liquid level sensor 503 and a third liquid level sensor 504, which are respectively used to prevent the fertilizer solution from overflowing during the fertilizer mixing process and ensure that the conductivity sensor 501 can work normally. The controller accurately controls the start / stop of the water suction pump 402 and the working frequency of each fertilizer suction pump 301 according to the conductivity information of the fertilizer solution fed back by the conductivity sensor 501, and finally realizes the accurate preparation of the single-component fertilizer solution.

[0040] Mixed application section: The main tasks are to mix the prepared single-component fertilizer solutions to form a multi-nutrient component water-fertilizer mixture, regulate the pH of the water-fertilizer mixture within the tolerance range of the crops, and irrigate the prepared water-fertilizer mixture to the crops. There is designed a fertilizer injection port 603 and a fertilizer outlet 904. The four-channel fertilizer injection pump 601 is used to inject different single-component fertilizer solutions and acid / alkali solutions into the fertilizer mixing tank 7 at the same flow rate. The second electromagnetic valve 602 and the fifth electromagnetic valve 902 are respectively used to automatically control the on / off of the fertilizer injection pipe 6 and the fertilizer application pipe 9. The acid solution tank 801 / alkali solution tank 802 are paired with the third electromagnetic valve 803 / fourth electromagnetic valve 804 to inject acid solution or alkali solution into the fertilizer mixing tank 7. The fertilizer mixing tank 7 is a place for the uniform mixing and pH regulation of the multi-nutrient component water-fertilizer mixture, and is internally equipped with a pH sensor 701 and a second electric stirrer 702, which are respectively used to on-line detect the pH information of the water-fertilizer mixture and achieve the full mixing among the single-component fertilizer solutions and the acid / alkali solutions. The outer wall of the fertilizer mixing tank 7 is equipped with a fourth liquid level sensor 703 and a fifth liquid level sensor 704, which are respectively used to prevent the fertilizer solution from overflowing during the fertilizer mixing process and ensure that the pH sensor 701 can work normally. The fertilizer solution pump 901 is used to extract the water-fertilizer mixture in the fertilizer mixing tank 7 and irrigate and fertilize the crops through the fertilizer application pipe 9. The flow meter 903 is used to detect the cumulative flow rate of the water-fertilizer mixture.

[0041] The working process of the present utility model is as follows:

[0042] Based on the characteristic that the conductivity sensor 501 can only reflect the total ion concentration information in the fertilizer solution, the device adopts the method of "preparing first and then mixing", that is, preparing each single-component fertilizer solution with a set concentration first and then mixing them to obtain a water-fertilizer mixture with multiple nutrient components. Therefore, it can achieve the precise preparation of the multi-nutrient component mixed fertilizer solution. In addition, the device regulates the pH value of the water-fertilizer mixture based on the pH method and detects the cumulative flow information of the water-fertilizer mixture based on the metering method through the flow meter 903.

[0043] Input the fertilizer types, the set values of the concentrations of each component in the mixed fertilizer solution, the pH value range of the fertilizer solution, and the total irrigation amount on the touch display screen 101. After completing the parameter setting, the device starts to run. Raw water detection: The water suction pump 402 operates at the rated flow rate to pump the external water source into the fertilizer mixing tank 5. When the liquid level in the fertilizer mixing tank 5 reaches the height where the third liquid level sensor 504 is located, the water suction pump 402 stops running. The conductivity sensor 501 online detects the conductivity value of the raw water in the fertilizer mixing tank 5, and takes the average value of the conductivity detection values in 3 fertilizer mixing tanks 5 as the final conductivity value of the raw water. Configuration of each single-component fertilizer solution: Both the water suction pump 402 and the fertilizer suction pump 301 operate at the rated flow rate to pump the raw water and the nutrient solution into the fertilizer mixing tank 7. The conductivity sensor 501 online detects the real-time conductivity information of the single-component fertilizer solution (the real conductivity value of the fertilizer solution = the detection value of the conductivity sensor 501 - the conductivity value of the raw water) and feeds it back to the controller. The controller adopts the fuzzy PID control method to dynamically change the working frequency of the fertilizer suction pump 301 to change the injection amount of the nutrient solution, and finally makes the concentration of the single-component fertilizer solution reach the set value (the concentration value of the single-component fertilizer solution = 3 * the concentration value of this component in the mixed fertilizer solution). When the liquid level in the fertilizer mixing tank 5 reaches the height where the second liquid level sensor 503 is located, the water suction pump 402 and the fertilizer suction pump 301 stop running. The configuration of each single-component fertilizer solution in each fertilizer mixing tank 5 is carried out simultaneously without interference. At the same time, the first electric stirrer 502 continuously operates during the fertilizer preparation process to achieve full mixing between the water and the nutrient solution. Fertilizer mixing: The four-channel fertilizer injection pump 601 starts to run and pumps the corresponding single-component fertilizer solution in each fertilizer mixing tank 5 into the fertilizer mixing tank 7 at the rated flow rate. At the same time, the second electric stirrer 702 continuously operates to achieve full mixing between the single-component fertilizer solutions. pH regulation: The pH sensor 701 in the fertilizer mixing tank 7 online detects the pH information of the water-fertilizer mixture and uploads it to the controller. The controller adds an appropriate amount of acid solution / alkali solution to the water-fertilizer mixture by controlling the on / off of the third / fourth solenoid valve 804 and the start / stop of the four-channel fertilizer injection pump 601, so that the pH value of the water-fertilizer mixture is within the tolerance range of the crops. Application immediately after preparation: The fertilizer solution pump 901 starts to run and pumps the water-fertilizer mixture in the fertilizer mixing tank 7 at the rated flow rate and irrigates the crops through the fertilization pipeline 9. At the same time, the device is carrying out the configuration of each single-component fertilizer solution, fertilizer mixing, and pH regulation of the water-fertilizer mixture. When the flow meter 903 detects that the cumulative flow of the water-fertilizer mixture reaches the set total irrigation amount, the device stops running.

[0044] It should be noted that during the operation of the device: when the liquid level in the fertilizer blending tank 5 rises to the height where the second liquid level sensor 503 is located, the water suction pump 402 and the fertilizer suction pump 301 stop running; when the liquid level drops to the height where the third liquid level sensor 504 is located, the four-channel fertilizer injection pump 601 stops running; when the liquid level in the fertilizer mixing tank 7 rises to the height where the fourth liquid level sensor 703 is located, the four-channel fertilizer injection pump 601 stops running; when the liquid level drops to the height where the fifth liquid level sensor 704 is located, the fertilizer liquid pump 901 stops running.

[0045] Finally, it should also be noted that in this article, relationships such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms including, containing or any other variant are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] The unit described as a separate component may or may not be physically separated, and the component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0047] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. An online water and fertilizer proportioning device based on EC and pH detection methods, characterized in that, Including: A fertilizer mixing module, including a nutrient solution tank and a fertilizer mixing tank set one-to-one with the nutrient solution tank. The fertilizer mixing tank is connected to the nutrient solution tank through a nutrient solution pipeline and to a water source through a water inlet pipeline. An electric conductivity sensor and a stirring device are arranged in the fertilizer mixing tank; A pH regulation module, including an acid solution tank and an alkali solution tank, which are connected to the fertilizer mixing tank through a liquid injection pipeline; A mixing and application module, including a fertilizer mixing tank, a fertilizer injection pipeline and a fertilization pipeline connected to the fertilizer mixing tank. A stirring device and a pH sensor are arranged in the fertilizer mixing tank, and it is connected to the fertilizer mixing tank and the liquid injection pipeline through a multi-channel fertilizer injection pump; A control module, including a control box and a liquid level sensor, a solenoid valve, and a flow meter connected to the control box. The liquid level sensor is installed in the nutrient solution tank, the fertilizer mixing tank and the fertilizer mixing tank. The solenoid valve is installed on the water inlet pipeline, the liquid injection pipeline, the fertilizer injection pipeline and the fertilization pipeline. The flow meter is also installed on the fertilization pipeline. The control box is also connected to the stirring device, the electric conductivity sensor, the multi-channel fertilizer injection pump and the pH sensor.

2. The online water and fertilizer ratio device based on the EC and pH detection methods according to claim 1, characterized in that A touch display screen is arranged on the outer wall of the control box, and a controller, a voltage stabilizing circuit and an audible and visual alarm are arranged inside the control box.

3. The online water and fertilizer proportioning device based on the EC and pH detection method according to claim 1, wherein Two liquid level sensors for detecting the highest liquid level and the lowest liquid level are installed on the outer walls of the fertilizer mixing tank and the fertilizer mixing tank.

4. The online water and fertilizer ratio device based on the EC and pH detection methods according to claim 1, wherein A fertilizer suction pump, a water suction pump and a fertilizer solution pump are correspondingly installed on the nutrient solution pipeline, the water inlet pipeline and the fertilization pipeline.

5. The online water and fertilizer proportioning device based on the EC and pH detection methods according to claim 1, wherein There are 3 nutrient solution tanks for storing high-concentration nutrient solutions of different types and single components, and the multi-channel fertilizer injection pump is a four-channel fertilizer injection pump.

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