Water and fertilizer online automatic mixing device based on metering pump fertilizer injection

Abstract

The utility model relates to a water and fertilizer online automatic mixing device based on metering pump fertilizer injection. The control mechanism and the mother liquor tank are installed on the rack, the mother liquor tank is provided with a liquid level sensor and a mother liquor pipeline, the mother liquor pipeline and the water inlet pipeline are communicated with the water and fertilizer mixing pipeline respectively, the mother liquor pipeline is provided with a mother liquor metering pump and a mother liquor injection inlet, and the water inlet pipeline is communicated with the water supply device through a water inlet of the water inlet pipeline. An electromagnetic valve, an inlet flowmeter and a water suction pump are mounted on the water inlet pipeline, an outlet flowmeter and a static fertilizer mixer are mounted on the water-fertilizer mixing pipeline, the fertilizer outlet pipeline is communicated with an outlet of the water-fertilizer mixing pipeline, a conductivity sensor is mounted on the fertilizer outlet pipeline, and a fertilizer outlet of the conductivity sensor is communicated with the fertilizing mechanism. The complexity and the operation and maintenance cost of the automatic water and fertilizer regulation and control system can be reduced, normal growth of crops is facilitated, meanwhile, the environment friendliness is better, the fertilizer mixing efficiency is higher, and the adaptability is higher.

Description

Technical Field

[0001] The present application relates to the technical field of automatic water-fertilizer mixing, and in particular to an online automatic water-fertilizer mixing device based on metering pump fertilizer injection. Background Art

[0002] As an important part of the development of modern agriculture, fine water and fertilizer management plays an important role in improving crop yield and quality, reducing agricultural production costs, and mitigating ecological and environmental damage. However, for a long time, my country has faced the dilemma of large water and fertilizer input, low output, and low comprehensive utilization efficiency of various factors in the field of agricultural irrigation and fertilization. The average utilization rate of chemical fertilizers in my country is much lower than that of developed countries. Excessive application of chemical fertilizers not only increases agricultural production costs, but also leads to increased environmental pollution and reduced arable land quality, seriously affecting the sustainable development of agriculture. In addition, most parts of my country still use extensive agricultural irrigation methods such as flooding and pouring, resulting in a large waste of water resources. Therefore, how to improve the efficiency of agricultural water and fertilizer utilization is an urgent problem to be solved in the development of modern green agriculture.

[0003] The water-fertilizer integration technology has a significant effect in saving water and fertilizer, and is one of the most effective ways to solve the above problems. As a typical application of this technology, the water-fertilizer integration machine can automatically adjust the water and fertilizer supply according to the growth needs of crops and environmental conditions, saving labor costs while greatly improving the efficiency and accuracy of fertilizer mixing. At present, there are two types of water-fertilizer integration machines on the market: offline and online. Compared with the offline water-fertilizer integration machine, the online water-fertilizer integration machine can dynamically adjust the fertilizer concentration according to the real-time growth needs of crops. It has strong adaptability and high fertilizer mixing efficiency, so it has a wider application scenario in modern agriculture. However, the online water-fertilizer integration machines on the market still have some shortcomings in practical applications. First, the direct mixing of water and fertilizer mother liquor through pipes cannot achieve uniform mixing, which leads to inconsistent concentrations during field fertilization, causing local over-fertilization or under-fertilization, seriously affecting the normal growth of crops, and may also increase the risk of environmental pollution. In addition, in order to improve the accuracy of water-fertilizer ratio and achieve more uniform water-fertilizer mixing, most water-fertilizer integration machines rely on complex hardware equipment and control strategies. The system is highly complex and difficult to operate and maintain, which greatly limits its promotion and application.

[0004] In view of the problems of uneven water-fertilizer mixing and complex control strategy in the actual application of the online water-fertilizer integrated machine, the utility model designs an online automatic water-fertilizer mixing device based on the method of fertilizer injection by a metering pump to simplify the system control strategy and achieve uniform mixing and precise proportioning of water and fertilizer. Utility Model Content

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides an online automatic water-fertilizer mixing device based on metering pump fertilizer injection, which can reduce the complexity and operation and maintenance costs of the water-fertilizer automatic control system, is conducive to the normal growth of crops, is more environmentally friendly, has higher fertilizer mixing efficiency and stronger adaptability.

[0006] The present application provides an online automatic water-fertilizer mixing device based on metering pump fertilizer injection, comprising a stand 1, a control mechanism 2, a mother liquid tank, a mother liquid pipeline, a water inlet pipeline 6, a water-fertilizer mixing pipeline 10, and a fertilizer outlet pipeline 11; the control mechanism 2 and the mother liquid tank are installed on the stand 1, the mother liquid tank is provided with a liquid level sensor, and is also provided with a mother liquid pipeline, the mother liquid pipeline and the water inlet pipeline 6 are respectively connected to the water-fertilizer mixing pipeline 10, the mother liquid pipeline is provided with a mother liquid metering pump and a mother liquid injection inlet, the water inlet pipeline 6 is connected to a water supply device through its water inlet 601, the water inlet pipeline 6 is installed with a solenoid valve 602, an inlet flowmeter 603 and a water pump 604, the water-fertilizer mixing pipeline 10 is installed with an outlet flowmeter 1001 and a static fertilizer mixer 1002, the fertilizer outlet pipeline 11 is connected to the outlet of the water-fertilizer mixing pipeline 10, the fertilizer outlet pipeline 11 is installed with a conductivity sensor 1101, and its fertilizer outlet 1102 is connected to a fertilizing mechanism.

[0007] The input end of the control mechanism 2 is electrically connected to the liquid level sensor, the inlet flow meter 603, the outlet flow meter 1001, and the conductivity sensor 1101, and the output end is electrically connected to the solenoid valve 602, the water pump 604, and the mother liquid metering pump.

[0008] Optionally, in some schemes, the mother liquid tank is provided with a nitrogen mother liquid tank 3, a phosphorus mother liquid tank 4, and a potassium mother liquid tank 5, wherein the nitrogen mother liquid tank 3, the phosphorus mother liquid tank 4, and the potassium mother liquid tank 5 are respectively installed with a nitrogen mother liquid tank level sensor 301, a phosphorus mother liquid tank level sensor 401, and a potassium mother liquid tank level sensor 501, the mother liquid pipeline includes a nitrogen mother liquid pipeline 7, a phosphorus mother liquid pipeline 8, and a potassium mother liquid pipeline 9, and the inlet ends of the nitrogen mother liquid pipeline 7, the phosphorus mother liquid pipeline 8, and the potassium mother liquid pipeline 9 are respectively The nitrogen mother liquid tank 3, the phosphorus mother liquid tank 4, and the potassium mother liquid tank 5 are respectively connected; a nitrogen mother liquid metering pump 701 is installed on the nitrogen mother liquid pipeline 7, and is connected to the water-fertilizer mixing pipeline 10 through the nitrogen mother liquid injection inlet 702; a phosphorus mother liquid metering pump 801 is installed on the phosphorus mother liquid pipeline 8, and is connected to the water-fertilizer mixing pipeline 10 through the phosphorus mother liquid injection inlet 802; a potassium mother liquid metering pump 901 is installed on the potassium mother liquid pipeline 9, and is connected to the water-fertilizer mixing pipeline 10 through the potassium mother liquid injection inlet 902.

[0009] Optionally, in some solutions, casters 101 are provided at the bottom of the stand 1 and are arranged in layers through a bottom baffle 102 , a middle baffle 103 and a top baffle 104 .

[0010] Optionally, in some schemes, the control mechanism 2 includes a touch screen 201, a controller 202, and a 24V voltage stabilizing circuit 203. The touch screen 201 is installed on the control box of the control mechanism 2. The controller 202 and the 24V voltage stabilizing circuit 203 are installed in the control box. The 24V voltage stabilizing circuit 203 supplies power to the device through a 220V AC power supply. The touch screen 201, the controller 202 and the 24V voltage stabilizing circuit 203 are electrically connected. The input end of the controller 202 is electrically connected to a data acquisition module composed of a nitrogen mother liquid tank level sensor 301, a phosphorus mother liquid tank level sensor 401, a potassium mother liquid tank level sensor 501, an inlet flow meter 603, an outlet flow meter 1001, and a conductivity sensor 1101. The output end of the controller 202 is electrically connected to an execution module composed of a solenoid valve 602, a water pump 604, a nitrogen mother liquid metering pump 701, a phosphorus mother liquid metering pump 801, and a potassium mother liquid metering pump 901.

[0011] The technical solution provided by this application may have the following beneficial effects:

[0012] This application adopts a relatively simple fuzzy control strategy to achieve accurate water-fertilizer ratio and regulation, thereby significantly reducing the complexity and operation and maintenance costs of the water-fertilizer automatic control system, and has higher market promotion and application value;

[0013] The present application adopts a mixing method combining pipeline mixing and static fertilizer mixer mixing, so that water and each mother liquor are fully mixed, and the formed water-fertilizer mixed liquid has higher uniformity, laying a foundation for accurate detection of fertilizer liquid concentration and accurate regulation of water and fertilizer; in addition, there will be no phenomenon of local over-fertilization or under-fertilization during field fertilization, which is conducive to the normal growth of crops and more environmentally friendly;

[0014] The present application can realize "immediate mixing and immediate application", that is, the prepared water-fertilizer mixture is directly irrigated to the crops through pipes, without the need for huge and bulky fertilizer tanks. The fertilizer mixing efficiency is higher and the adaptability is stronger, and the application scenarios in modern agriculture are more extensive.

[0015] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0017] Figure 1 It is a structural schematic diagram of an online automatic water-fertilizer mixing device based on metering pump fertilizer injection shown in an embodiment of the present application;

[0018] Figure 2 It is a control block diagram of an online automatic water-fertilizer mixing device based on metering pump fertilizer injection shown in an embodiment of the present application;

[0019] Figure 3 It is a fuzzy control block diagram of an online automatic water-fertilizer mixing device based on metering pump fertilizer injection shown in an embodiment of the present application;

[0020] Figure 4 This is an automatic fertilizer mixing operation flow chart of an online automatic water-fertilizer mixing device based on metering pump fertilizer injection shown in an embodiment of the present application;

[0021] Figure 5 It is a flow chart of nitrogen fertilizer concentration control of an online automatic water-fertilizer mixing device based on metering pump fertilizer injection shown in an embodiment of the present application;

[0022] Figure 6 It is a flow chart of nitrogen fertilizer flow control of an online automatic water-fertilizer mixing device based on metering pump fertilizer injection shown in an embodiment of the present application.

[0023] Reference numerals:

[0024] 1. Stand; 101. Casters; 102. Bottom baffle; 103. Middle baffle; 104. Top baffle; 2. Control mechanism; 201. Touch screen; 202. Controller; 203. 24V voltage regulator circuit; 3. Nitrogen mother liquid tank; 301. Nitrogen mother liquid tank level sensor; 4. Phosphorus mother liquid tank; 401. Phosphorus mother liquid tank level sensor; 5. Potassium mother liquid tank; 501. Potassium mother liquid tank level sensor; 6. Water inlet pipe; 601. Water inlet; 602. Solenoid valve; 603. Inlet flow meter; 604, water pump; 7, nitrogen mother liquor pipeline; 701, nitrogen mother liquor metering pump; 702, nitrogen mother liquor injection inlet; 8, phosphorus mother liquor pipeline; 801, phosphorus mother liquor metering pump; 802, phosphorus mother liquor injection inlet; 9, potassium mother liquor pipeline; 901, potassium mother liquor metering pump; 902, potassium mother liquor injection inlet; 10, water-fertilizer mixing pipeline; 1001, outlet flow meter; 1002, static fertilizer mixer; 11, fertilizer outlet pipeline; 1101, conductivity sensor; 1102, fertilizer outlet. DETAILED DESCRIPTION

[0025] 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 accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described 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.

[0026] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this 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 this 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 as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0028] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In response to the above problems, an embodiment of the present application provides an online automatic water-fertilizer mixing device based on metering pump fertilizer injection, which can reduce the complexity and operation and maintenance costs of the water-fertilizer automatic control system, is conducive to the normal growth of crops, is more environmentally friendly, has higher fertilizer mixing efficiency and stronger adaptability.

[0030] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1The water-fertilizer online automatic mixing device based on metering pump fertilizer injection includes a stand 1, a control mechanism 2, a mother liquid tank, a mother liquid pipeline, a water inlet pipeline 6, a water-fertilizer mixing pipeline 10, and a fertilizer outlet pipeline 11; the control mechanism 2 and the mother liquid tank are installed on the stand 1, the mother liquid tank is provided with a liquid level sensor, and a mother liquid pipeline is also installed, the mother liquid pipeline and the water inlet pipeline 6 are respectively connected to the water-fertilizer mixing pipeline 10, the mother liquid pipeline is provided with a mother liquid metering pump and a mother liquid injection inlet, the water inlet pipeline 6 is connected to the water supply device through its water inlet 601, the water inlet pipeline 6 is installed with a solenoid valve 602, an inlet flowmeter 603 and a water pump 604, the water-fertilizer mixing pipeline 10 is installed with an outlet flowmeter 1001 and a static fertilizer mixer 1002, the fertilizer outlet pipeline 11 is connected with the outlet of the water-fertilizer mixing pipeline 10, the fertilizer outlet pipeline 11 is installed with a conductivity sensor 1101, and its fertilizer outlet 1102 is connected to the fertilization mechanism.

[0032] The input end of the control mechanism 2 is electrically connected to the liquid level sensor, the inlet flow meter 603, the outlet flow meter 1001, and the conductivity sensor 1101, and the output end is electrically connected to the solenoid valve 602, the water pump 604, and the mother liquid metering pump.

[0033] During operation, the water inlet pipe 6 is installed with an electromagnetic valve 602, an inlet flow meter 603 and a water pump 604, which are respectively used to automatically control the opening and closing of the water inlet pipe 6, detect the water flow, and extract and pump water from an external water source; the water inlet 601 of the water inlet pipe 6 is connected to the inlet of the electromagnetic valve 602, the outlet of the electromagnetic valve 602 is connected to the liquid inlet of the inlet flow meter 603, the liquid outlet of the inlet flow meter 603 is connected to the inlet end of the water pump 604, and the outlet end of the water pump 604 is connected to the water-fertilizer mixing pipe 10; the water extracted by the water pump 604 is pumped into the water-fertilizer mixing pipe 10 after passing through the electromagnetic valve 602 and the inlet flow meter 603, and is subsequently mixed with each mother liquor.

[0034] The liquid level sensor detects the mother liquid in the mother liquid tank, and the mother liquid metering pump is used to pump and meter the nutrient mother liquid. One end of the mother liquid pipe is placed inside the mother liquid tank, and the other end is connected to the inlet of the mother liquid metering pump. The outlet of the mother liquid metering pump is connected to the water-fertilizer mixing pipe 10 through the mother liquid injection inlet on the mother liquid pipe. The mother liquid metering pump pumps the mother liquid into the water-fertilizer mixing pipe 10, and then mixes it with water.

[0035] The water-fertilizer mixing pipeline 10 is equipped with an outlet flow meter 1001 and a static fertilizer mixer 1002, which are respectively used to detect the flow of the water-fertilizer mixture and promote the full mixing of water and mother liquor; the mixture of water and mother liquor passes through the outlet flow meter 1001 and is fully mixed in the static fertilizer mixer 1002 before entering the fertilizer outlet pipeline 11.

[0036] A conductivity sensor 1101 is provided on the fertilizer outlet pipe 11 for real-time and online detection of the conductivity value of the water-fertilizer mixture fully mixed by the static fertilizer mixer 1002, providing a basis for subsequent water-fertilizer regulation; the configured water-fertilizer mixture flows out from the fertilizer outlet 1102 to irrigate and fertilize crops.

[0037] The control mechanism 2 receives information from the liquid level sensor, the inlet flow meter 603, the outlet flow meter 1001, and the conductivity sensor 1101, and then analyzes and displays the information to control the operation of the solenoid valve 602, the water pump 604, and the mother liquid metering pump.

[0038] In some embodiments, casters 101 are provided at the bottom of the stand 1 and are arranged in layers through a bottom baffle 102 , a middle baffle 103 and a top baffle 104 .

[0039] When working, the stand 1 is an aluminum profile stand. The aluminum profile stand has a three-layer structure, which is used to arrange and integrate various hardware equipment. The hardware equipment required for the three core links of fertilizer injection, fertilizer mixing and fertilizer control are orderly distributed in these three layers; four casters 101 that can rotate in any direction and have a locking function are arranged at the bottom to enhance the flexibility and adaptability of the device.

[0040] In some embodiments, the mother liquid tank is provided with a nitrogen mother liquid tank 3, a phosphorus mother liquid tank 4, and a potassium mother liquid tank 5, wherein a nitrogen mother liquid tank level sensor 301, a phosphorus mother liquid tank level sensor 401, and a potassium mother liquid tank level sensor 501 are installed in the nitrogen mother liquid tank 3, the phosphorus mother liquid tank 4, and the potassium mother liquid tank 5, respectively; the mother liquid pipeline comprises a nitrogen mother liquid pipeline 7, a phosphorus mother liquid pipeline 8, and a potassium mother liquid pipeline 9; the inlet ends of the nitrogen mother liquid pipeline 7, the phosphorus mother liquid pipeline 8, and the potassium mother liquid pipeline 9 are respectively connected to the nitrogen mother liquid tank 3, the phosphorus mother liquid tank 4, and the potassium mother liquid tank 5; a nitrogen mother liquid metering pump 701 is installed on the nitrogen mother liquid pipeline 7, and is connected to a water-fertilizer mixing pipeline 10 through a nitrogen mother liquid injection inlet 702; a phosphorus mother liquid metering pump 801 is installed on the phosphorus mother liquid pipeline 8, and is connected to a water-fertilizer mixing pipeline 10 through a phosphorus mother liquid injection inlet 802; a potassium mother liquid metering pump 901 is installed on the potassium mother liquid pipeline 9, and is connected to a water-fertilizer mixing pipeline 10 through a potassium mother liquid injection inlet 902.

[0041] See also Figure 2-4The control mechanism 2 includes a touch screen 201, a controller 202, and a 24V voltage stabilizing circuit 203. The control box of the control mechanism 2 is equipped with a touch screen 201, and the controller 202 and the 24V voltage stabilizing circuit 203 are installed in the control box. The 24V voltage stabilizing circuit 203 supplies energy to the device through a 220V AC power supply. The touch screen 201, the controller 202 and the 24V voltage stabilizing circuit 203 are electrically connected. The input end of the controller 202 is electrically connected to a data acquisition module composed of a nitrogen mother liquid tank level sensor 301, a phosphorus mother liquid tank level sensor 401, a potassium mother liquid tank level sensor 501, an inlet flow meter 603, an outlet flow meter 1001, and a conductivity sensor 1101. The output end of the controller 202 is electrically connected to an execution module composed of a solenoid valve 602, a water pump 604, a nitrogen mother liquid metering pump 701, a phosphorus mother liquid metering pump 801, and a potassium mother liquid metering pump 901.

[0042] When working, the conductivity value of the water-fertilizer mixture is selected as the controlled variable, and the pulse frequency of the metering pump is selected as the controlled variable; a two-dimensional fuzzy controller is designed, whose input is the deviation (e=ry) between the set value (r) and the actual detection value (y) of the water-fertilizer mixture conductivity and the change rate of the conductivity deviation ec, and the output is the pulse frequency (u) of the metering pump; by changing the pulse frequency of the metering pump, the injection amount of nitrogen, phosphorus and potassium mother liquor is dynamically changed, thereby changing the conductivity value of the water-fertilizer mixture (there is a very significant positive correlation between the conductivity value and the concentration value of the fertilizer solution), and finally making the conductivity (concentration) of the water-fertilizer mixture reach the set value. The specific fuzzy control rules designed are shown in Table 1.

[0043] Table 1 Fuzzy control rules table

[0044]

[0045] In Table 1: the language value corresponding to the conductivity deviation e is {high, okay, low}, which respectively indicates that the current conductivity value is high, just right, and low; the language value corresponding to the conductivity deviation change rate ec is {negative, none, positive}, which respectively indicates that the current conductivity value decreases, remains unchanged, and increases; the language value corresponding to the pulse frequency u of the metering pump is {down-fast, down-slow, no-change, up-slow, up-fast}, which respectively indicates that the frequency value decreases quickly, the frequency value decreases slowly, the frequency value remains unchanged, the frequency value increases slowly, and the frequency value increases quickly.

[0046] This application involves three main steps:

[0047] Fertilizer injection link: The main task is to pump water and various nutrient mother solutions. Considering the high demand for the three key nutrients nitrogen, phosphorus and potassium for crop growth, the device is designed with a water inlet 601 and three mother solution injection inlets (nitrogen mother solution injection inlet 702, phosphorus mother solution injection inlet 802, potassium mother solution injection inlet 902); nitrogen mother solution tank 3, phosphorus mother solution tank 4, potassium mother solution tank 5 are installed on the bottom layer, which are used to store high-concentration nutrient mother solutions of single components of nitrogen, phosphorus and potassium respectively; liquid level sensors are installed at the same height below the outer wall of each mother solution tank for low liquid level detection of the mother solution. When the liquid level of the mother solution in the tank is lower than the set value, the device automatically stops running to avoid Idle operation without mother liquid will damage the metering pump and send out an alarm signal to remind the user to add mother liquid in time. A water pump 604 and three mother liquid metering pumps (nitrogen mother liquid metering pump 701, phosphorus mother liquid metering pump 801, potassium mother liquid metering pump 901) are installed in the middle layer, which are used to extract external water source and extract nutrient mother liquid of nitrogen, phosphorus and potassium respectively. A solenoid valve 602 is installed at the water inlet 601 of the bottom layer, which is used to automatically control the opening and closing of the water inlet pipe 6. Based on the high precision and good stability of the metering pump, the injection amount of each mother liquid is more accurate, which is more convenient to adjust the water-fertilizer ratio, so as to achieve the purpose of simplifying the control strategy.

[0048] Fertilizer mixing stage: The main task is to achieve sufficient mixing of water and each mother liquor, and the required hardware equipment is a static fertilizer mixer 1002; first, water and each mother liquor are initially mixed in the water-fertilizer mixing pipe 10 on the top layer to obtain a relatively uniform water-fertilizer mixture; in addition, a static fertilizer mixer 1002 is installed in the middle layer and before the conductivity sensor 1101, and the power of the water flow itself is used for secondary mixing of water and each mother liquor without the need for external power; the water-fertilizer mixture after secondary mixing by the static fertilizer mixer 1002 has reached a completely mixed state, laying the foundation for the subsequent conductivity sensor 1101 to accurately detect the conductivity (concentration) of the fertilizer solution.

[0049] Fertilizer control link: The main task is to accurately adjust the ratio and supply of water and fertilizer in order to achieve the set fertilization target; this link is divided into a detection part, a control part and an execution part. A conductivity sensor 1101 is installed in the middle layer to detect the conductivity (concentration) information of the water-fertilizer mixture; an inlet flow meter 603 is installed in the bottom layer to detect the flow of water; an outlet flow meter 1001 is installed in the top layer to detect the flow of the water-fertilizer mixture; the controller 202 accurately controls the start and stop of the water pump 604 and the pulse frequency of each metering pump according to the concentration and flow information fed back by the conductivity sensor 1101 and the flow meter, and finally realizes the precise ratio of water and fertilizer.

[0050] Working process of this application:

[0051] Based on the characteristic that the conductivity sensor 1101 can only detect the concentration information of a single-component fertilizer solution, the device sequentially prepares nitrogen, phosphorus and potassium single-component fertilizer solutions in the order of "preparing nitrogen fertilizer first, then phosphorus fertilizer, and finally potassium fertilizer"; controls the concentration of the water-fertilizer mixture based on the conductivity method and fuzzy control strategy; and confirms whether each single-component fertilizer solution reaches the set fertilization amount through the inlet flow meter 603 based on the metering method, such as Figure 5-6 , taking nitrogen fertilizer as an example for operation.

[0052] The type of mixed fertilizer, target fertilizer concentration and set fertilizer amount are input on the touch screen 201. After the parameter setting is completed, the device starts to run and starts to configure the first single-component fertilizer solution; the water pump 604 and the metering pump respectively extract water and mother liquid from the external water source and the mother liquid tank and pump them into the water-fertilizer mixing pipeline 10 for primary mixing to form a relatively uniform water-fertilizer mixed solution; the water-fertilizer mixed solution relies on its own power to flow through the static fertilizer mixer 1002 for secondary mixing to achieve full mixing of water and mother liquid; the conductivity sensor 1101 detects the conductivity value of the water-fertilizer mixed solution in real time and online, and uploads the data information to the controller 202; the controller 202 compares the set value and the actual detection value of the water-fertilizer mixed solution conductivity The values ​​are compared to obtain the conductivity deviation (e) and the conductivity deviation change rate (ec), which are used as the input variables of the fuzzy controller; the fuzzy controller forms a control signal to act on the metering pump after fuzzy reasoning and fuzzy decision-making, and adjusts the injection amount of the mother liquid by dynamically changing the pulse frequency of the metering pump, so that the conductivity (concentration) of the water-fertilizer mixture finally reaches the set value; the device adopts the "immediate application" method, that is, the configured fertilizer liquid is directly irrigated to the crops through the fertilization pipe; the inlet flow meter detects the water flow in real time. When the water volume reaches the set value, the device completes the configuration of the first single-component fertilizer liquid and starts to configure the next single-component fertilizer liquid; the device stops running after completing the configuration of all single-component fertilizer liquids.

[0053] Finally, it should be noted that, in this article, relationships such as first and second, etc. are used only 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 include, include or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0055] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection 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 persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An automatic water-fertilizer online mixing device based on metering pump fertilizer injection, characterized in that: The water-fertilizer online automatic mixing device based on metering pump fertilizer injection comprises a stand (1), a control mechanism (2), a mother liquid tank, a mother liquid pipeline, a water inlet pipeline (6), a water-fertilizer mixing pipeline (10), and a fertilizer outlet pipeline (11); the control mechanism (2) and the mother liquid tank are installed on the stand (1); a liquid level sensor is provided on the mother liquid tank; a mother liquid pipeline is also provided; the mother liquid pipeline and the water inlet pipeline (6) are respectively connected to the water-fertilizer mixing pipeline (10); a mother liquid metering pump and a mother liquid injection inlet are provided on the mother liquid pipeline; The water inlet pipe (6) is connected to the water supply device through its water inlet (601); a solenoid valve (602), an inlet flow meter (603) and a water pump (604) are installed on the water inlet pipe (6); an outlet flow meter (1001) and a static fertilizer mixer (1002) are installed on the water-fertilizer mixing pipe (10); a fertilizer outlet pipe (11) is connected to the outlet of the water-fertilizer mixing pipe (10); a conductivity sensor (1101) is installed on the fertilizer outlet pipe (11); and its fertilizer outlet (1102) is connected to a fertilizing mechanism; The input end of the control mechanism (2) is electrically connected to the liquid level sensor, the inlet flow meter (603), the outlet flow meter (1001), and the conductivity sensor (1101), and the output end is electrically connected to the solenoid valve (602), the water pump (604), and the mother liquid metering pump.

2. The water-fertilizer online automatic mixing device based on metering pump fertilizer injection according to claim 1 is characterized in that: The mother liquid tank is provided with a nitrogen mother liquid tank (3), a phosphorus mother liquid tank (4), and a potassium mother liquid tank (5); a nitrogen mother liquid tank level sensor (301), a phosphorus mother liquid tank level sensor (401), and a potassium mother liquid tank level sensor (501) are respectively installed in the nitrogen mother liquid tank (3), the phosphorus mother liquid tank (4), and the potassium mother liquid tank (5); the mother liquid pipeline comprises a nitrogen mother liquid pipeline (7), a phosphorus mother liquid pipeline (8), and a potassium mother liquid pipeline (9); the inlet ends of the nitrogen mother liquid pipeline (7), the phosphorus mother liquid pipeline (8), and the potassium mother liquid pipeline (9) are respectively connected to the nitrogen mother liquid pipeline. A nitrogen mother liquid tank (3), a phosphorus mother liquid tank (4), and a potassium mother liquid tank (5); a nitrogen mother liquid metering pump (701) is installed on the nitrogen mother liquid pipeline (7), and is connected to the water-fertilizer mixing pipeline (10) through a nitrogen mother liquid injection inlet (702); a phosphorus mother liquid metering pump (801) is installed on the phosphorus mother liquid pipeline (8), and is connected to the water-fertilizer mixing pipeline (10) through a phosphorus mother liquid injection inlet (802); and a potassium mother liquid metering pump (901) is installed on the potassium mother liquid pipeline (9), and is connected to the water-fertilizer mixing pipeline (10) through a potassium mother liquid injection inlet (902).

3. The water-fertilizer online automatic mixing device based on metering pump fertilizer injection according to claim 2 is characterized in that: The bottom of the stand (1) is provided with casters (101), and is arranged in layers through a bottom baffle (102), a middle baffle (103) and a top baffle (104).

4. The water-fertilizer online automatic mixing device based on metering pump fertilizer injection according to claim 3 is characterized in that: The control mechanism (2) comprises a touch display screen (201), a controller (202), and a 24V voltage stabilizing circuit (203); the touch display screen (201) is installed on a control box of the control mechanism (2); the controller (202) and the 24V voltage stabilizing circuit (203) are installed in the control box; the 24V voltage stabilizing circuit (203) supplies energy to the device through a 220V AC power supply; the touch display screen (201), the controller (202) and the 24V voltage stabilizing circuit (203) are electrically connected; an input of the controller (202) The end is electrically connected to a data acquisition module consisting of a nitrogen mother liquid tank level sensor (301), a phosphorus mother liquid tank level sensor (401), a potassium mother liquid tank level sensor (501), an inlet flow meter (603), an outlet flow meter (1001), and a conductivity sensor (1101); and the output end of the controller (202) is electrically connected to an execution module consisting of a solenoid valve (602), a water pump (604), a nitrogen mother liquid metering pump (701), a phosphorus mother liquid metering pump (801), and a potassium mother liquid metering pump (901).

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