Device for testing performance of fertilizer liquid sensor

Abstract

The utility model relates to a device for testing the performance of a fertilizer liquid sensor, and relates to the technical field of water and fertilizer integration. According to the device for testing the performance of the fertilizer liquid sensor, heating is carried out by controlling the heating pipe, and temperature regulation and control can be carried out on the fertilizer liquid in the water and fertilizer circulation pipeline in cooperation with detection feedback of the temperature transmitter; pressure regulation and control can be performed on the fertilizer liquid in the water and fertilizer circulation pipeline by controlling the opening degree of the pressure regulating valve and matching with detection feedback of the pressure transmitter; the rotating speed of a circulating pump motor is adjusted through a frequency converter, and a flow meter in a water and fertilizer circulating pipeline is matched, so that the output flow of the pump is controlled, and the circulating rate of water and fertilizer liquid is regulated; by regulating and controlling the temperature, the pressure and the flow speed, the dynamic environment change of the fertilizer liquid flowing in a pipe network in practical application can be accurately simulated, a test environment condition is provided for the performance test of the fertilizer liquid sensor, and the accuracy and the stability of the performance test are effectively guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of water-fertilizer integration, and in particular to a device for testing the performance of a fertilizer liquid sensor. Background Art

[0002] Water-fertilizer integration technology is one of the important means for modern agriculture to transform into precision agriculture and smart agriculture. In the smart irrigation system, accurate detection of fertilizer liquid information is the key to achieving efficient and accurate fertilization. The fertilizer liquid information detection equipment monitors the fertilizer liquid through sensors installed in the irrigation network to ensure the scientificity and accuracy of the fertilization process.

[0003] However, due to the complex and changeable working environment of the actual irrigation network, the physical parameters of the fertilizer liquid in the pipeline, such as pressure, flow rate and temperature, often have a certain impact on the detection performance of the fertilizer liquid sensor, resulting in unstable sensor readings, which in turn affects the accuracy of fertilization and ultimately affects the growth of crops. Therefore, before the fertilizer liquid information detection equipment is put into practical use, the performance of the sensor in the equipment needs to be fully tested and calibrated.

[0004] At present, the performance test of fertilizer liquid sensors used for detection is mainly carried out in the on-site working pipe network. The on-site working pipe network can provide an environment close to the actual application. However, due to the complex on-site working conditions, it is difficult to accurately control and adjust the physical and chemical parameters of the fertilizer liquid, and the consistency and repeatability of the test conditions cannot be guaranteed, which will lead to inaccurate performance evaluation results of the sensor. At the same time, on-site testing usually consumes a large amount of water and fertilizer resources, and each test is costly and wastes a lot of resources. Utility Model Content

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a device for performance testing of a fertilizer liquid sensor, which can accurately simulate the dynamic environmental changes when the fertilizer liquid flows in a pipeline network in actual applications, provide test environment conditions for the performance test of the fertilizer liquid sensor, and effectively ensure the accuracy and stability of the performance test.

[0006] The present application provides a device for testing the performance of a fertilizer liquid sensor, comprising:

[0007] A water-fertilizer tank, the top of which is provided with a fertilizer injection port, and the interior of which is provided with a conductivity sensor;

[0008] A circulation device, the circulation device comprising: a circulation pump, a flow meter, a fertilizer mixer, a temperature transmitter and a pressure transmitter, the circulation pump is sequentially connected with the fertilizer mixer and the water-fertilizer tank through a pipeline to form a water-fertilizer circulation pipeline, the flow meter, the temperature transmitter and the pressure transmitter are installed on the water-fertilizer circulation pipeline to detect environmental parameters in the water-fertilizer circulation pipeline;

[0009] The water-fertilizer circulation pipeline is provided with a detection tee pipe for installing a fertilizer liquid sensor during testing;

[0010] The regulating device includes: a heating pipe and a pressure regulating valve. The heating pipe is installed inside the water-fertilizer tank and is used to regulate the temperature of the water-fertilizer liquid. The pressure regulating valve is installed on the water-fertilizer circulation pipeline and is used to regulate the pressure of the water-fertilizer liquid.

[0011] The control device comprises: a controller and a control box. The controller is arranged and installed in the control box. The controller is electrically connected with the conductivity sensor, the flow meter, the fertilizer mixer, the temperature transmitter, the pressure transmitter, the heating tube and the pressure regulating valve respectively.

[0012] Optionally, in some embodiments of the present application:

[0013] The control device also includes: a frequency converter;

[0014] The controller establishes an electrical connection with the circulation pump through the frequency converter to regulate the circulation rate of the water fertilizer liquid.

[0015] Optionally, in some embodiments of the present application:

[0016] The device for testing the performance of the fertilizer liquid sensor further includes: a waste liquid device, which includes: a waste liquid tank, a first solenoid valve and a second solenoid valve;

[0017] The waste liquid tank is connected to the water-fertilizer circulation pipeline through a pipeline to form a waste liquid pipeline;

[0018] The first solenoid valve is installed on the waste liquid pipeline to control the on-off of the waste liquid pipeline;

[0019] The second solenoid valve is installed on the water-fertilizer circulation pipeline, located at the rear end of the liquid outlet port of the circulation pump, and is used to control the on-off of the water-fertilizer circulation pipeline;

[0020] The controller is electrically connected to the first solenoid valve and the second solenoid valve respectively.

[0021] Optionally, in some embodiments of the present application:

[0022] The control box is provided with a display screen;

[0023] An electrical connection is established between the controller and the display screen.

[0024] Optionally, in some embodiments of the present application:

[0025] The device for testing the performance of the fertilizer liquid sensor also includes: a test bench;

[0026] The test bench is provided with a test table, and the water-fertilizer tank, the circulation device, the regulating device, the control device and the waste liquid device are all arranged and installed on the test table, and the pipes in the water-fertilizer circulation pipeline and the waste liquid pipeline are attached to the test bench.

[0027] The technical solution provided by this application may have the following beneficial effects:

[0028] The present application controls the heating of the heating tube and cooperates with the detection feedback of the temperature transmitter to control the temperature of the fertilizer liquid in the water-fertilizer circulation pipeline so that the fertilizer liquid reaches a set temperature value; controls the opening size of the pressure regulating valve and cooperates with the detection feedback of the pressure transmitter to control the pressure of the fertilizer liquid in the water-fertilizer circulation pipeline so that the fertilizer liquid reaches a set pressure value; adjusts the speed of the circulation pump motor through the frequency converter and cooperates with the flow meter in the water-fertilizer circulation pipeline to control the output flow of the pump, thereby realizing the regulation of the circulation rate of the water-fertilizer liquid.

[0029] By regulating temperature, pressure and flow rate, the present application can accurately simulate the dynamic environmental changes of fertilizer liquid when flowing in the pipeline network in actual applications, provide test environment conditions for the performance test of fertilizer liquid sensor, and effectively ensure the accuracy and stability of performance test.

[0030] The present application is uniformly controlled by a controller, which can achieve comprehensive control of the test process, effectively improve the efficiency of the test, and reduce the test deviation caused by operator errors. At the same time, the cost of each test of the present application is low, and after the test, the fertilizer liquid is transported to the waste liquid tank through the waste liquid pipeline for recycling, which can reduce resource waste.

[0031] 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

[0032] 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.

[0033] Figure 1 It is a schematic diagram of a connected structure of a device for testing the performance of a fertilizer liquid sensor in this application;

[0034] Figure 2 is a structural diagram of the controller in this application;

[0035] Figure 3 It is a schematic diagram of the overall structure of the device for testing the performance of the fertilizer liquid sensor of the present application;

[0036] Figure 4 It is a side view overall structural schematic diagram of the device for testing the performance of the fertilizer liquid sensor of the present application;

[0037] Figure markings: 1-water-fertilizer tank, 101-fertilizer injection port, 102-conductivity sensor, 103-detection three-way pipe, 2-circulation device, 201-circulation pump, 202-flow meter, 203-fertilizer mixer, 204-temperature transmitter, 205-pressure transmitter, 3-adjustment device, 301-heating tube, 302-pressure regulating valve, 4-control device, 401-controller, 402-control box, 403-frequency converter, 404-display screen, 5-waste liquid device, 501-waste liquid tank, 502-first solenoid valve, 503-second solenoid valve, 6-test bench, 601-test table, 7-fertilizer liquid sensor. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] At present, the performance test of fertilizer liquid sensors used for detection is mainly carried out in the on-site working pipe network. The on-site working pipe network can provide an environment close to the actual application. However, due to the complex on-site working conditions, it is difficult to accurately control and adjust the physical and chemical parameters of the fertilizer liquid, and the consistency and repeatability of the test conditions cannot be guaranteed, which will lead to inaccurate performance evaluation results of the sensor. At the same time, on-site testing usually consumes a large amount of water and fertilizer resources, and each test is costly and wastes a lot of resources.

[0043] In response to the above problems, an embodiment of the present application provides a device for performance testing of a fertilizer liquid sensor, which can accurately simulate the dynamic environmental changes when the fertilizer liquid flows in a pipeline network in actual applications, provide test environment conditions for the performance testing of the fertilizer liquid sensor, and effectively ensure the accuracy and stability of the performance test.

[0044] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0045] Figure 1 It is a schematic diagram of a connected structure of a device for testing the performance of a fertilizer liquid sensor in this application;

[0046] Figure 2 is a structural diagram of the controller in this application;

[0047] Figure 3 It is a schematic diagram of the overall structure of the device for testing the performance of the fertilizer liquid sensor of the present application;

[0048] Figure 4 It is a side view schematic diagram of the overall structure of the device used for fertilizer liquid sensor performance testing in the present application.

[0049] See also Figure 1-4 , a device for testing the performance of a fertilizer liquid sensor, comprising:

[0050] The water-fertilizer tank 1 has a fertilizer injection port 101 at the top thereof, and a conductivity sensor 102 is arranged inside the water-fertilizer tank 1 .

[0051] In this embodiment, a cover is hingedly provided at the fertilizer injection port 101. Before the test, the fertilizer solution with a good concentration is input into the water-fertilizer tank 1 from the fertilizer injection port 101, and then the cover is closed to carry out the subsequent test work. At the same time, the conductivity of the fertilizer solution in the water-fertilizer tank 1 can be detected by the conductivity sensor 102 to confirm whether the fertilizer solution is fully mixed.

[0052] The circulation device 2 comprises: a circulation pump 201, a flow meter 202, a fertilizer mixer 203, a temperature transmitter 204 and a pressure transmitter 205. The circulation pump 201 is connected to the fertilizer mixer 203 and the water-fertilizer tank 1 in sequence through a pipeline to form a water-fertilizer circulation pipeline. The flow meter 202, the temperature transmitter 204 and the pressure transmitter 205 are installed on the water-fertilizer circulation pipeline to detect environmental parameters in the water-fertilizer circulation pipeline.

[0053] In this embodiment, the fertilizer liquid in the water-fertilizer tank 1 is extracted by the circulation pump 201, and the fertilizer liquid is circulated in the water-fertilizer circulation pipeline, the fertilizer mixer 203 accelerates the water-fertilizer mixing process, and the flow rate, temperature and pressure of the fertilizer liquid in the water-fertilizer circulation pipeline are detected by the flow meter 202, the temperature transmitter 204 and the pressure transmitter 205 respectively. After the installation is completed, the environmental parameters in the water-fertilizer circulation pipeline can be detected by the circulation device 2.

[0054] The water-fertilizer circulation pipeline is provided with a detection tee 103 for installing the fertilizer liquid sensor 7 during testing. In this embodiment, the fertilizer liquid sensor 7 is a capacitive sensor, which is installed on the detection tee 103 through the fertilizer liquid sensor 7 before testing, and is used to detect the composition and concentration of the fertilizer liquid in the water-fertilizer circulation pipeline.

[0055] The regulating device 3 includes: a heating tube 301 and a pressure regulating valve 302. The heating tube 301 is installed inside the water-fertilizer tank 1 for regulating the temperature of the water-fertilizer liquid. The pressure regulating valve 302 is installed on the water-fertilizer circulation pipeline for regulating the pressure of the water-fertilizer liquid.

[0056] In this embodiment, by controlling the heating tube 301 for heating and cooperating with the detection feedback of the temperature transmitter 204, the temperature of the fertilizer liquid in the water-fertilizer circulation pipeline can be regulated so that the fertilizer liquid reaches a set temperature value; by controlling the opening size of the pressure regulating valve 302 and cooperating with the detection feedback of the pressure transmitter 205, the pressure of the fertilizer liquid in the water-fertilizer circulation pipeline can be regulated so that the fertilizer liquid reaches a set pressure value.

[0057] Specifically, the method for constant pressure regulation of fertilizer liquid by the present device includes: selecting the pressure of the fertilizer liquid on the pipeline as the controlled quantity, and selecting the opening size of the pressure regulating valve 302 as the controlled quantity; designing a two-dimensional fuzzy controller, whose input is: the set value (r) of the fertilizer liquid pressure, the deviation (e=ry) of the actual detection value (y) and the change rate ec of the pressure deviation, and the output is: controlling the opening size (u) of the pressure regulating valve 302; changing the opening size of the pressure regulating valve 302 by changing the input current of the pressure regulating valve 302, thereby regulating the pressure value of the fertilizer liquid on the circulation pipeline, and finally making the pressure value of the fertilizer liquid on the circulation pipeline reach the set value.

[0058] Specifically, the method for constant temperature control of fertilizer liquid by the present device includes: selecting the temperature of the fertilizer liquid in the circulation pipeline as the controlled variable, the on-off time of the heating tube 301 as the controlled variable, and the rest of the parts are consistent with the constant pressure control method.

[0059] The control device 4 includes: a controller 401 and a control box 402. The controller 401 is arranged and installed in the control box 402. The controller 401 is electrically connected to the conductivity sensor 102, the flow meter 202, the fertilizer mixer 203, the temperature transmitter 204, the pressure transmitter 205, the heating tube 301, and the pressure regulating valve 302 respectively.

[0060] In this embodiment, the controller 401 is a single-chip microcomputer controller, and a 24V voltage regulator circuit and a 3.3V voltage regulator circuit are provided in the control box 402, wherein the 24V voltage regulator circuit provides the power required for the normal operation of the touch display screen 404, the solenoid valve and various sensors, and the 3.3V voltage regulator circuit provides the power required for the normal operation of the controller 401. The unified control by the controller 401 can improve the automation of the operation and improve the test efficiency.

[0061] Specifically, the control device 4 also includes: a frequency converter 403; the controller 401 establishes an electrical connection with the circulation pump 201 through the frequency converter 403, and is used to control the circulation rate of the water fertilizer liquid. In this embodiment, the speed of the motor of the circulation pump 201 is adjusted by the frequency converter 403, and the flow meter 202 in the water fertilizer circulation pipeline is cooperated to control the output flow of the pump, so as to realize the regulation of the circulation rate of the water fertilizer liquid. Specifically, the method for constant flow rate regulation of the fertilizer liquid by this device includes: selecting the flow rate of the fertilizer liquid in the water fertilizer circulation pipeline as the controlled quantity, the operating frequency of the circulation pump 201 as the control quantity, and the rest are consistent with the constant pressure control method.

[0062] Specifically, a display screen 404 is installed on the control box 402, and an electrical connection is established between the controller 401 and the display screen 404. In this embodiment, the display screen 404 cooperates with the corresponding host computer system to facilitate operation and improve test efficiency.

[0063] Specifically: the device for testing the performance of the fertilizer liquid sensor in this embodiment also includes that the waste liquid device 5 includes: a waste liquid tank 501, a first solenoid valve 502 and a second solenoid valve 503; the waste liquid tank 501 is connected to the water-fertilizer circulation pipeline through a pipeline to form a waste liquid pipeline; the first solenoid valve 502 is arranged and installed on the waste liquid pipeline to control the on-off of the waste liquid pipeline; the second solenoid valve 503 is arranged and installed on the water-fertilizer circulation pipeline, located at the rear end position of the liquid outlet port of the circulation pump 201, to control the on-off of the water-fertilizer circulation pipeline; the controller 401 establishes electrical connections with the first solenoid valve 502 and the second solenoid valve 503 respectively.

[0064] In this embodiment, during the test, by controlling to open the first solenoid valve 502 and close the second solenoid valve 503, the water-fertilizer circulation pipeline can be kept open and the waste liquid pipeline can be closed, so that the fertilizer liquid can circulate in the water-fertilizer circulation pipeline to perform a performance test of the fertilizer liquid sensor 7. After the test is completed, by controlling to open the second solenoid valve 503 and close the first solenoid valve 502, the water-fertilizer circulation pipeline can be kept closed and the waste liquid pipeline can be opened, so that the fertilizer liquid can be transported to the waste liquid tank 501 through the waste liquid pipeline for collection, so that it can continue to be used for subsequent tests, or directly recycled, reducing data waste.

[0065] Specifically, the device for testing the performance of the fertilizer liquid sensor in this embodiment also includes: a test bench 6; a test table 601 is provided on the test bench 6, and the water-fertilizer tank 1, the circulation device 2, the adjustment device 3, the control device 4 and the waste liquid device 5 are all installed on the test table 601, and the pipes in the water-fertilizer circulation pipeline and the waste liquid pipeline are attached to the test bench 6.

[0066] In this embodiment, by providing the test bench 6, the performance test of the fertilizer liquid sensor 7 can be conveniently performed, thereby improving the test efficiency.

[0067] The use process of the device for testing the performance of the fertilizer liquid sensor in this embodiment is as follows:

[0068] Before the test begins, the fertilizer liquid sensor 7 to be tested is installed on the detection tee pipe 103;

[0069] The fertilizer solution with a good concentration is input into the water-fertilizer tank 1 from the fertilizer injection port 101, and then the cover is closed;

[0070] The set values ​​of flow rate, pressure and temperature are input through the display screen 404 on the control box 402, and then the control starts to perform the test;

[0071] After the test is completed, the detection value of the fertilizer liquid sensor 7 is read and compared with the concentration value of the fertilizer liquid with a good concentration ratio, so as to test and calibrate the fertilizer liquid sensor 7.

[0072] The technical solution in the embodiment of the present application includes the following beneficial effects:

[0073] In this embodiment, by controlling the heating tube 301 for heating, and cooperating with the detection feedback of the temperature transmitter 204, the temperature of the fertilizer liquid in the water-fertilizer circulation pipeline can be controlled so that the fertilizer liquid reaches a set temperature value; by controlling the opening size of the pressure regulating valve 302, and cooperating with the detection feedback of the pressure transmitter 205, the pressure of the fertilizer liquid in the water-fertilizer circulation pipeline can be controlled so that the fertilizer liquid reaches a set pressure value; the speed of the motor of the circulation pump 201 is adjusted by the frequency converter 403, and the flow meter 202 in the water-fertilizer circulation pipeline is cooperated to control the output flow of the pump, thereby realizing the regulation of the circulation rate of the water-fertilizer liquid.

[0074] In this embodiment, by regulating the temperature, pressure and flow rate, the dynamic environmental changes of the fertilizer liquid when flowing in the pipeline network in actual applications can be accurately simulated, providing test environment conditions for the performance test of the fertilizer liquid sensor 7, and effectively ensuring the accuracy and stability of the performance test.

[0075] In this embodiment, unified control is performed through the controller 401, which can achieve comprehensive control of the test process, effectively improve the efficiency of the test, and reduce the test deviation caused by operator errors. At the same time, the cost of each test of this application is low, and after the test, the fertilizer liquid is transported to the waste liquid tank 501 through the waste liquid pipeline for recycling, which can reduce resource waste.

[0076] 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.

[0077] 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. A device for testing the performance of a fertilizer liquid sensor, characterized in that: include: A water-fertilizer tank (1), wherein a fertilizer injection port (101) is provided at the top of the water-fertilizer tank (1), and a conductivity sensor (102) is provided inside the water-fertilizer tank (1); A circulation device (2), the circulation device (2) comprising: a circulation pump (201), a flow meter (202), a fertilizer mixer (203), a temperature transmitter (204) and a pressure transmitter (205); the circulation pump (201) is connected to the fertilizer mixer (203) and the water-fertilizer tank (1) in sequence through a pipeline to form a water-fertilizer circulation pipeline; the flow meter (202), the temperature transmitter (204) and the pressure transmitter (205) are installed on the water-fertilizer circulation pipeline to detect environmental parameters in the water-fertilizer circulation pipeline; The water-fertilizer circulation pipeline is provided with a detection tee pipe (103) for installing a fertilizer liquid sensor (7) during testing; A regulating device (3), the regulating device (3) comprising: a heating pipe (301) and a pressure regulating valve (302), the heating pipe (301) being arranged and installed inside the water-fertilizer tank (1) for regulating the temperature of the water-fertilizer liquid, and the pressure regulating valve (302) being arranged and installed on the water-fertilizer circulation pipeline for regulating the pressure of the water-fertilizer liquid; A control device (4), the control device (4) comprising: a controller (401) and a control box (402), the controller (401) being arranged and installed in the control box (402), and the controller (401) being electrically connected to a conductivity sensor (102), a flow meter (202), a fertilizer mixer (203), a temperature transmitter (204), a pressure transmitter (205), a heating tube (301), and a pressure regulating valve (302).

2. The device for testing the performance of a fertilizer liquid sensor according to claim 1, characterized in that: The control device (4) further includes: a frequency converter (403); The controller (401) is electrically connected to the circulation pump (201) via the frequency converter (403) to control the circulation rate of the water fertilizer liquid.

3. The device for testing the performance of a fertilizer liquid sensor according to claim 2, characterized in that: The device for testing the performance of the fertilizer liquid sensor further comprises: a waste liquid device (5), wherein the waste liquid device (5) comprises: a waste liquid tank (501), a first solenoid valve (502) and a second solenoid valve (503); The waste liquid tank (501) is connected to the water-fertilizer circulation pipeline through a pipeline to form a waste liquid pipeline; The first solenoid valve (502) is installed on the waste liquid pipeline and is used to control the on-off of the waste liquid pipeline; The second solenoid valve (503) is installed on the water-fertilizer circulation pipeline, located at the rear end of the liquid outlet port of the circulation pump (201), and is used to control the on-off of the water-fertilizer circulation pipeline; The controller (401) is electrically connected to the first solenoid valve (502) and the second solenoid valve (503).

4. The device for testing performance of a fertilizer liquid sensor according to any one of claims 1 to 3, characterized in that: The control box (402) is provided with a display screen (404); An electrical connection is established between the controller (401) and the display screen (404).

5. The device for testing performance of a fertilizer liquid sensor according to claim 4, characterized in that: The device for testing the performance of the fertilizer liquid sensor further comprises: a test bench (6); The test bench (6) is provided with a test table (601); the water-fertilizer tank (1), the circulation device (2), the regulating device (3), the control device (4) and the waste liquid device (5) are all arranged and installed on the test table (601); and the pipes in the water-fertilizer circulation pipeline and the waste liquid pipeline are arranged in dependence on the test bench (6).

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