Softened water multi-way valve control system

Abstract

The invention discloses a softened water multi-way valve control system, and relates to the technical field of automatic control. Comprising a programmable logic controller, a touch screen, a driving motor and a plurality of valve body state detection devices, the programmable logic controller is in communication connection with the touch screen, the programmable logic controller is electrically connected with the driving motor and the valve body state detection devices, the driving motor is connected with a multi-way valve in a softened water system through a rotating shaft connecting rod, and the multi-way valve is connected with the touch screen. The plurality of valve body state detection devices are in one-to-one correspondence with a plurality of valve body rotation positions of a multi-way valve in the softened water system; the programmable logic controller is used for controlling the driving motor to drive the multi-way valve to rotate based on the current softened water treatment stage of the softened water system, and / or controlling the driving motor to drive the multi-way valve to rotate based on a control signal of the touch screen; and the touch screen is used for displaying the valve body rotating positions detected by the plurality of valve body state detection devices. According to the system, the multi-way valve can be conveniently controlled, and the state of the multi-way valve can be conveniently known.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control, and in particular relates to a softened water multi-way valve control system. Background Art

[0002] Many pieces of equipment in coal mines require water circulation for cooling. To prevent equipment scaling and extend service life, softened water is often used as the cooling medium. Softened water is often processed using a plasma exchange process, with multi-way valves used to implement processes such as backwashing, slow salt absorption wash, fast wash, and salt tank filling. However, most valves are mechanically controlled, using knobs to adjust the timing of each process. This is complex to operate and provides limited visibility into the valve's status.

[0003] Therefore, how to provide an effective solution to facilitate the control of the valve body and intuitively understand the status of the valve body has become a difficult problem that needs to be solved urgently in the existing technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a softened water multi-way valve control system to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a softened water multi-way valve control system, comprising: A programmable logic controller, a touch screen, a drive motor, and multiple valve body state detection devices, wherein the programmable logic controller is communicatively connected to the touch screen, the programmable logic controller is electrically connected to the drive motor and the multiple valve body state detection devices respectively, the drive motor is connected to the multi-way valve in the softened water system via a rotating shaft connecting rod, and the multiple valve body state detection devices correspond one-to-one to multiple valve body rotation positions of the multi-way valve in the softened water system and are used to detect the valve body rotation position of the multi-way valve; The programmable logic controller is used to control the drive motor to drive the multi-way valve to rotate based on the softening water treatment stage currently in the softening water system, and / or to control the drive motor to drive the multi-way valve to rotate based on a control signal generated by the touch screen in response to a touch operation of a user; The touch screen is used to display the valve body rotation position detected by the multiple valve body status detection devices.

[0006] In one possible design, the softened water multi-way valve control system also includes a communication module, which is communicatively connected to the programmable logic controller and the host computer respectively. The communication module is used to upload the valve body rotation position of the multi-way valve detected by the multiple valve body status detection devices to the host computer, and receive the control signal sent by the host computer. The programmable logic controller is also used to control the drive motor to drive the valve body of the multi-way valve to rotate based on the control signal sent by the host computer.

[0007] In a possible design, the valve body state detection device is a travel switch.

[0008] In one possible design, the programmable logic controller is further configured to determine the softening water treatment stage currently in the softening water system based on the valve body rotation position of the multi-way valve detected by the multiple valve body state detection devices; The touch screen is also used to display the softening water treatment stage currently in the softening water system.

[0009] In one possible design, the touch screen is also used to display the set running time of the softening water treatment stage currently in which the softening water system is located, and the running time of the softening water treatment stage currently in which the softening water system is located.

[0010] In a possible design, the multi-way valve includes four output ports, which are respectively connected to the resin tank brine inlet circuit, the resin tank water inlet circuit, the resin tank drainage circuit and the resin tank sewage discharge circuit in the softening water system.

[0011] In one possible design, the resin tank drain circuit includes a first drain circuit, a second drain circuit, and a third drain circuit, the second drain circuit and the third drain circuit are both provided with electric heaters, and the heating temperatures of the electric heaters in the second drain circuit and the third drain circuit are different, the softened water multi-way valve control system also includes a first resistance meter, a second resistance meter, a third resistance meter, a first temperature sensor, a second temperature sensor, and a third temperature sensor, the first resistance meter, the second resistance meter, the third resistance meter, the first temperature sensor, the second temperature sensor, and the third temperature sensor are all communicatively connected to the programmable logic controller, the first resistance meter and the first temperature sensor are arranged at the same position in the first drain circuit, the second resistance meter and the second temperature sensor are arranged at the same position in the second drain circuit, and the third resistance meter and the third temperature sensor are arranged at the same position in the third drain circuit; When the softened water treatment stage currently in the softened water system is the backwash stage, the slow wash stage, the fast wash stage and / or the brine regeneration stage, the programmable logic controller determines the concentration of each particle in the resin tank sewage circuit according to the following method: acquiring a first average resistance of the current period detected by the first resistance meter, a second average resistance of the current period detected by the second resistance meter, a third average resistance of the current period detected by the third resistance meter, a first average temperature of the current period detected by the first temperature sensor, a second average temperature of the current period detected by the second temperature sensor, and a third average temperature of the current period detected by the third temperature sensor; Combine the first average resistance, the second average resistance, the third average resistance, the first average temperature, the second average temperature, and the third average temperature to obtain a resistance and temperature characteristic vector corresponding to the resin tank sewage discharge circuit in the current period; The resistance and temperature characteristic vectors corresponding to the resin tank drain circuit in the current period are used as inputs of a pre-trained particle concentration detection model to perform calculations to obtain the concentration of each particle in the resin tank drain circuit in the current period. The concentration of each particle in the drain outlet in the current period includes the concentration of sodium ions in the resin tank drain circuit in the current period, the concentration of magnesium ions in the resin tank drain circuit in the current period, and the concentration of potassium ions in the resin tank drain circuit in the current period. The particle concentration detection model is trained by using the resistance and temperature characteristic vectors corresponding to the resin tank sewage circuit in the historical period as sample inputs and the concentration of each particle in the resin tank sewage circuit in the historical period as sample outputs.

[0012] In one possible design, the programmable logic controller is further used to determine whether there is an abnormality in the current softening water treatment stage of the softening water system based on the concentration of each particle in the resin tank discharge circuit during the current period and the current softening water treatment stage of the softening water system.

[0013] In one possible design, the particle concentration detection model is a recurrent neural network model or a convolutional neural network model.

[0014] Beneficial effects: 1. The present invention is provided with a programmable logic controller, a touch screen, a drive motor and multiple valve body state detection devices. The programmable logic controller is communicatively connected to the touch screen, and the programmable logic controller is electrically connected to the drive motor and the multiple valve body state detection devices respectively. The drive motor is connected to the multi-way valve in the softened water system through a rotating shaft connecting rod. The multiple valve body state detection devices correspond one-to-one to the multiple valve body rotation positions of the multi-way valve in the softened water system, and are used to detect the valve body rotation position of the multi-way valve; the programmable logic controller is used to control the drive motor to drive the multi-way valve to rotate based on the current softened water treatment stage of the softened water system, and / or control the drive motor to drive the multi-way valve to rotate based on a control signal generated by the touch screen in response to a user's touch operation; the touch screen is used to display the valve body rotation position detected by the multiple valve body state detection devices. In this way, the valve body rotation position of the multi-way valve can be automatically controlled by the programmable logic controller, or the valve body rotation position of the multi-way valve can be manually controlled through the touch screen, thereby facilitating the control of the multi-way valve in the softened water system. At the same time, the valve body rotation position of the multi-way valve in the softened water system can be displayed through the touch screen, so that the user can intuitively understand the on-off status of each circuit in the softened water system.

[0015] 2. By setting up the communication module, the softening water system can be remotely controlled through the host computer, and it is convenient for remote users to understand the current status of the softening water system.

[0016] 3. The touch screen can display the current softening water treatment stage of the softening water system, so that users can understand the current softening water treatment stage of the softening water system in real time.

[0017] 4. The concentration of each particle in the resin tank sewage circuit in the current period can be predicted through temperature detection and resistance detection, so as to determine whether there is any abnormality in the softening water treatment stage of the softening water system based on the concentration of each particle in the resin tank sewage circuit in the current period and the softening water treatment stage of the softening water system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a softened water multi-way valve control system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a softened water system provided in an embodiment of the present application; Figure 3 This is a flow chart for detecting the concentration of various particles in the resin tank drain circuit provided in an embodiment of the present application.

[0019] icon: 1-Programmable logic controller; 2-Touch screen; 3-Communication module; 4-Drive motor; 5-Valve body status detection device. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0021] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element without departing from the scope of the exemplary embodiments of the present invention.

[0022] It should be understood that the term "and / or" that may appear in this document is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may indicate three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" that may appear in this document describes another type of association object relationship, indicating that two relationships may exist. For example, A / and B may indicate two situations: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0023] Example like Figure 1 As shown, an embodiment of the present application provides a softened water multi-way valve control system, which is used to control the multi-way valve in the softened water system and facilitate understanding of the status of the multi-way valve. The softened water multi-way valve control system includes a programmable logic controller 1, a touch screen 2, a drive motor 4 and multiple valve body status detection devices 5.

[0024] The programmable logic controller 1 is communicatively connected to the touch screen 2. The programmable logic controller 1 is electrically connected to a drive motor 4 and multiple valve state detection devices 5. The drive motor 4 is connected to a multi-way valve in the softened water system via a rotating shaft connecting rod. The multiple valve state detection devices 5 correspond one-to-one with multiple valve body rotational positions of the multi-way valve in the softened water system and are used to detect the valve body rotational positions of the multi-way valve. The programmable logic controller 1 is used to control the drive motor 4 to rotate the multi-way valve based on the softened water treatment stage currently in the softened water system, and / or to control the drive motor 4 to rotate the multi-way valve based on a control signal generated by the touch screen 2 in response to a user's touch operation. The touch screen 2 is used to display the valve body rotational position of the multi-way valve detected by the multiple valve body state detection devices 5, so that the on / off status of each circuit in the softened water system can be understood based on the valve body rotational position of the multi-way valve.

[0025] The control signal generated by the touch screen 2 in response to the user's touch operation can be a rotation control signal for a multi-way valve or a control signal for switching the softening water treatment stages of the softening water system, which is not specifically limited in the embodiments of the present application. The softening water treatment stages of the softening water system can include, but are not limited to, a water production stage, a backwash stage, a slow wash stage, a fast wash stage, and a brine regeneration stage.

[0026] See also Figure 2 The softened water system includes a resin tank brine inlet circuit, a resin tank water inlet circuit, a resin tank drainage circuit, and a resin tank sewage discharge circuit. The multi-way valve includes four output ports, which are respectively connected to the resin tank brine inlet circuit, the resin tank water inlet circuit, the resin tank drainage circuit, and the resin tank sewage discharge circuit in the softened water system. Through such a setting, the multi-way valve can be conveniently used to control the conduction / cutoff of the fat tank brine inlet circuit, the resin tank water inlet circuit, the resin tank drainage circuit, and the resin tank sewage discharge circuit, and the touch screen 2 can be used to intuitively understand the on / off status of the fat tank brine inlet circuit, the resin tank water inlet circuit, the resin tank drainage circuit, and the resin tank sewage discharge circuit.

[0027] The valve body state detection device 5 is used to detect the valve body rotation position of the multi-way valve. In the embodiment of the present application, the valve body state detection device 5 adopts a travel switch, and the travel switch is provided with contacts. When the valve body of the multi-way valve rotates to one rotation position, the valve body contacts with one of the contacts of the travel switch. When the valve body is rotated to another rotation position, the valve body contacts with the contacts of the other travel switch, thereby changing the state of the circuit and realizing the detection of the valve body rotation position of the multi-way valve.

[0028] It is understandable that in some other embodiments, the valve body state detection device 5 may also adopt a proximity switch, which will not be described in detail here.

[0029] See also Figure 1To facilitate remote control of the softened water system, the softened water multi-way valve control system provided in the embodiment of the present application is further provided with a communication module 3. Communication module 3 is respectively connected to the programmable logic controller 1 and the host computer. Communication module 3 is used to transmit the valve body rotation position of the multi-way valve detected by the multiple valve body state detection devices 5 to the host computer and receive control signals from the host computer. The programmable logic controller 1 is further used to control the drive motor 4 to rotate the valve body of the multi-way valve based on the control signal sent by the host computer. By providing communication module 3, the softened water system can be remotely controlled through the host computer, while also allowing remote users to understand the current status of the softened water system.

[0030] Because the rotational position of the multi-way valve varies at different stages of the softened water system, in one or more embodiments, the programmable logic controller 1 can also be used to determine the current softened water treatment stage of the softened water system based on the rotational position of the multi-way valve detected by the multiple valve state detection devices 5. In this way, the current softened water treatment stage of the softened water system can be automatically detected based on the rotational position of the multi-way valve.

[0031] The touch screen 2 can also be used to display the softening water treatment stage currently in the softening water system, the set running time of the softening water treatment stage currently in the softening water system, and the running time of the softening water treatment stage currently in the softening water system. This allows the user to intuitively understand the softening water treatment stage currently in the softening water system and the operating status of the softening water treatment stage.

[0032] Because sodium, magnesium, and potassium water behave differently in water and exhibit different properties, they respond differently to temperature changes. Sodium ions have a relatively high mobility and change significantly with temperature, while magnesium ions have a relatively low mobility and change more slowly with temperature. Potassium ions have a mobility between those of sodium and magnesium ions, and their temperature changes also lie somewhere in between. Therefore, the resistance curves and magnitudes of these waters vary significantly when the temperature changes.

[0033] Based on the differences in the behaviors and properties of sodium particle water, magnesium particle water, and potassium particles in water, an embodiment of the present application provides a method for detecting the concentration of each particle in a resin tank drain circuit.

[0034] Specifically, the resin tank drain circuit can be configured as three drain circuits: a first drain circuit, a second drain circuit, and a third drain circuit. Electric heaters are installed in both the second and third drain circuits, and the heating temperatures of the electric heaters in the second and third drain circuits are different. This ensures that the wastewater discharged from the three drain circuits has different temperatures, facilitating subsequent measurement of particle concentrations. The softened water multi-way valve control system also includes a first resistance meter, a second resistance meter, a third resistance meter, a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first resistance meter, the second resistance meter, the third resistance meter, the first temperature sensor, the second temperature sensor, and the third temperature sensor are all communicatively connected to the programmable logic controller 1 so that the detected temperature / resistance is fed back to the programmable logic controller 1. The first resistance meter and the first temperature sensor are located at the same location within the first drain circuit, the second resistance meter and the second temperature sensor are located at the same location within the second drain circuit, and the third resistance meter and the third temperature sensor are located at the same location within the third drain circuit.

[0035] like Figure 3 As shown, when the softened water treatment stage currently in the softened water system is the backwash stage, the slow wash stage, the fast wash stage and / or the brine regeneration stage, the programmable logic controller 1 determines the concentration of each particle in the resin tank sewage discharge circuit according to the method of steps S301-S303: Step S301. Obtain the first average resistance of the current period detected by the first resistance meter, the second average resistance of the current period detected by the second resistance meter, the third average resistance of the current period detected by the third resistance meter, the first average temperature of the current period detected by the first temperature sensor, the second average temperature of the current period detected by the second temperature sensor, and the third average temperature of the current period detected by the third temperature sensor.

[0036] Step S302: Combine the first average resistance, the second average resistance, the third average resistance, the first average temperature, the second average temperature, and the third average temperature to obtain a resistance and temperature characteristic vector corresponding to the resin tank drain circuit in the current period.

[0037] For example, the first average resistance of the current period is r1, the second average resistance of the current period is r2, the third average resistance of the current period is r3, the first average temperature of the current period is w1, the second average temperature of the current period is w2, and the third average temperature of the current period is w3. Then, the resistance and temperature characteristic vectors corresponding to the resin tank drain circuit in the current period can be expressed as (r1, r2, r3, w1, w2, w3).

[0038] In one or more embodiments, after obtaining the resistance and temperature feature vector corresponding to the resin tank blowdown circuit of the current period, the resistance and temperature feature vector can also be normalized.

[0039] Step S303. The resistance and temperature feature vector corresponding to the resin tank blowdown circuit of the current period is taken as the input of the pre-trained particle concentration detection model to obtain the concentration of each particle in the resin tank blowdown circuit of the current period.

[0040] The concentration of each particle in the blowdown port of the current period includes the concentration of sodium ions in the resin tank blowdown circuit of the current period, the concentration of magnesium ions in the resin tank blowdown circuit of the current period, and the concentration of potassium ions in the resin tank blowdown circuit of the current period. The particle concentration detection model can be trained by taking the resistance and temperature feature vector corresponding to the historical period resin tank blowdown circuit as the sample input and the concentration of each particle in the historical period resin tank blowdown circuit as the sample output. The particle concentration detection model can be, but is not limited to, a recurrent neural network (RNN) model or a convolutional neural network (CNN) model, etc., which is not specifically limited in the present application.

[0041] In the softening water treatment process, the purpose and operation mode of each stage are different, resulting in different components of the wastewater discharged by the resin tank blowdown circuit. Therefore, the concentration range of each particle under normal circumstances in different softening water treatment stages can be determined in advance according to historical data. After determining the concentration of each particle in the resin tank blowdown circuit of the current period, the programmable logic controller 1 can also determine whether there is an abnormality in the softening water treatment stage currently occupied by the softening water system based on the concentration of each particle in the resin tank blowdown circuit of the current period and the softening water treatment stage currently occupied by the softening water system. In this way, the abnormality detection of the softening water treatment stage currently occupied by the softening water system can be realized.

[0042] In summary, the softening water multi-way valve control system provided by the present application has the following beneficial effects: 1. The present application can automatically control the valve body rotation position of the multi-way valve through the programmable logic controller, or manually control the valve body rotation position of the multi-way valve through the touch screen, thereby facilitating the control of the multi-way valve in the softening water system. At the same time, the valve body rotation position of the multi-way valve in the softening water system can be displayed through the touch screen, so that the user can intuitively understand the on-off state of each circuit in the softening water system.

[0043] 2. By setting the communication module, the softening water system can be remotely controlled by the upper computer, and the current state of the softening water system can be easily understood by the remote user.

[0044] 3. The touch screen can display the current softening water treatment stage of the softening water system, so that users can understand the current softening water treatment stage of the softening water system in real time.

[0045] 4. The concentration of each particle in the resin tank sewage circuit in the current period can be predicted through temperature detection and resistance detection, so as to determine whether there is any abnormality in the softening water treatment stage of the softening water system based on the concentration of each particle in the resin tank sewage circuit in the current period and the softening water treatment stage of the softening water system.

[0046] It should be understood that in the following description, specific details are provided to facilitate a thorough understanding of the example embodiments. However, one of ordinary skill in the art will appreciate that the example embodiments can be practiced without these specific details. For example, the system may be shown in block diagrams to avoid obscuring the examples with unnecessary detail.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A softened water multi-way valve control system, characterized in that: include: A programmable logic controller (1), a touch screen (2), a drive motor (4) and a plurality of valve body state detection devices (5), wherein the programmable logic controller (1) is communicatively connected to the touch screen (2), the programmable logic controller (1) is electrically connected to the drive motor (4) and the plurality of valve body state detection devices (5), respectively, the drive motor (4) is connected to a multi-way valve in a softened water system via a rotating shaft connecting rod, and the plurality of valve body state detection devices (5) correspond one to one to a plurality of valve body rotation positions of the multi-way valve in the softened water system, and are used to detect the valve body rotation position of the multi-way valve; The programmable logic controller (1) is used to control the drive motor (4) to drive the multi-way valve to rotate based on the softening water treatment stage currently in the softening water system, and / or to control the drive motor (4) to drive the multi-way valve to rotate based on a control signal generated by the touch screen (2) in response to a user's touch operation; The touch screen (2) is used to display the valve body rotation positions detected by the multiple valve body state detection devices (5).

2. The softened water multi-way valve control system according to claim 1, characterized in that: The invention also includes a communication module (3), wherein the communication module (3) is respectively connected to the programmable logic controller (1) and the host computer for communication, and the communication module (3) is used to transmit the valve body rotation position of the multi-way valve detected by the multiple valve body state detection devices (5) to the host computer, and receive the control signal sent by the host computer. The programmable logic controller (1) is also used to control the drive motor (4) to drive the valve body of the multi-way valve to rotate based on the control signal sent by the host computer.

3. The softened water multi-way valve control system according to claim 1, characterized in that: The valve body state detection device (5) is a travel switch.

4. The softened water multi-way valve control system according to claim 1, characterized in that: The programmable logic controller (1) is further configured to determine the softening water treatment stage currently in the softening water system based on the valve body rotation position of the multi-way valve detected by the plurality of valve body state detection devices (5); The touch screen (2) is also used to display the softening water treatment stage currently in which the softening water system is located.

5. The softened water multi-way valve control system according to claim 4, characterized in that: The touch screen (2) is also used to display the set running time of the softening water treatment stage currently in which the softening water system is located, and the running time of the softening water treatment stage currently in which the softening water system is located.

6. The softened water multi-way valve control system according to claim 1, characterized in that: The multi-way valve includes four output ports, which are respectively connected to the resin tank brine inlet circuit, the resin tank water inlet circuit, the resin tank drainage circuit and the resin tank sewage discharge circuit in the softening water system.

7. The softened water multi-way valve control system according to claim 6, characterized in that: The resin tank drain circuit includes a first drain circuit, a second drain circuit and a third drain circuit, the second drain circuit and the third drain circuit are both provided with electric heaters, and the heating temperatures of the electric heaters in the second drain circuit and the third drain circuit are different, the softened water multi-way valve control system also includes a first resistance meter, a second resistance meter, a third resistance meter, a first temperature sensor, a second temperature sensor and a third temperature sensor, the first resistance meter, the second resistance meter, the third resistance meter, the first temperature sensor, the second temperature sensor and the third temperature sensor are all communicatively connected to the programmable logic controller (1), the first resistance meter and the first temperature sensor are arranged at the same position in the first drain circuit, the second resistance meter and the second temperature sensor are arranged at the same position in the second drain circuit, and the third resistance meter and the third temperature sensor are arranged at the same position in the third drain circuit; When the softening water treatment stage currently in the softening water system is the backwash stage, the slow wash stage, the fast wash stage and / or the brine regeneration stage, the programmable logic controller (1) determines the concentration of each particle in the resin tank sewage circuit according to the following method: acquiring a first average resistance of the current period detected by the first resistance meter, a second average resistance of the current period detected by the second resistance meter, a third average resistance of the current period detected by the third resistance meter, a first average temperature of the current period detected by the first temperature sensor, a second average temperature of the current period detected by the second temperature sensor, and a third average temperature of the current period detected by the third temperature sensor; Combine the first average resistance, the second average resistance, the third average resistance, the first average temperature, the second average temperature, and the third average temperature to obtain a resistance and temperature characteristic vector corresponding to the resin tank sewage discharge circuit in the current period; The resistance and temperature characteristic vectors corresponding to the resin tank drain circuit in the current period are used as inputs of a pre-trained particle concentration detection model to perform calculations to obtain the concentration of each particle in the resin tank drain circuit in the current period. The concentration of each particle in the drain outlet in the current period includes the concentration of sodium ions in the resin tank drain circuit in the current period, the concentration of magnesium ions in the resin tank drain circuit in the current period, and the concentration of potassium ions in the resin tank drain circuit in the current period. The particle concentration detection model is trained by using the resistance and temperature characteristic vectors corresponding to the resin tank sewage circuit in the historical period as sample inputs and the concentration of each particle in the resin tank sewage circuit in the historical period as sample outputs.

8. The softened water multi-way valve control system according to claim 7, characterized in that: The programmable logic controller (1) is further used to determine whether there is an abnormality in the softening water treatment stage currently in the softening water system based on the concentration of each particle in the resin tank sewage discharge circuit during the current period and the softening water treatment stage currently in the softening water system.

9. The softened water multi-way valve control system according to claim 7, characterized in that: The particle concentration detection model is a recurrent neural network model or a convolutional neural network model.

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