Dish-washing machine water tank solution content monitoring system based on conductivity method

Abstract

The utility model relates to the technical field of dishwashers, in particular to a dishwasher water tank solution content monitoring system based on a conductivity method, comprising a power supply module, a conductivity detection module, a conductivity inspection module and a control module, the power supply module is used for providing voltage; the conductivity detection module is connected to the power supply module and used for detecting the conductivity of the solution in the water tank of the dish-washing machine and generating and outputting a solution conductivity signal according to a detection result; the conductivity detection module is connected to the output ends of the power supply module and the conductivity detection module, receives the solution conductivity signal, compares the conductivity in the solution conductivity signal with preset conductivity, and generates and outputs a control instruction when the conductivity is lower than the preset conductivity; and the control module is used for receiving and responding to the control instruction and pumping the machine washing liquid into the dish-washing machine water tank from the storage groove.

Description

Technical Field

[0001] The present application relates to the technical field of dishwashers, and in particular to a dishwasher water tank solution content monitoring system based on a conductivity method. Background Art

[0002] In the field of dishwasher technology, ensuring an effective level of detergent in the water tank is crucial for maintaining a dishwasher's cleaning performance. Traditional dishwashers typically rely on users to manually add detergent, which is not only cumbersome but also difficult to precisely control the solution concentration. Excessively high or low solution concentrations can affect dishwashing performance, even leading to wasteful use of resources or damage to the equipment. Utility Model Content

[0003] In order to solve at least one of the above technical problems, the present application provides a dishwasher water tank solution content monitoring system based on conductivity method, which adopts the following technical solutions:

[0004] A dishwasher water tank solution content monitoring system based on conductivity method includes a power supply module, a conductivity detection module, a conductivity inspection module and a control module, wherein:

[0005] The power supply module is connected to the mains to provide voltage;

[0006] The conductivity detection module is connected to the power supply module and is used to detect the conductivity of the solution in the dishwasher water tank and generate and output a solution conductivity signal based on the detection result;

[0007] The conductivity inspection module is connected to the power supply module and the output end of the conductivity detection module, and is used to receive the solution conductivity signal and compare the conductivity in the solution conductivity signal with a preset conductivity. When the conductivity is lower than the preset conductivity, the control instruction is generated and output;

[0008] The control module is connected to the power supply module and the output end of the conductive detection module, and is used to receive and respond to control instructions to pump the machine washing liquid from the storage tank into the dishwasher water tank.

[0009] With the above technical solution, the power supply module, a foundational component, connects to the mains electricity supply to provide a stable voltage for the entire monitoring system, ensuring the proper operation of all other modules. A stable power supply is essential for the system's ability to continuously and accurately monitor the conductivity of the solution in the water tank, providing a reliable energy source for subsequent automatic adjustments. Next, the conductivity detection module uses the voltage provided by the power supply module to monitor the conductivity of the solution in the dishwasher's water tank in real time. This module accurately measures the solution's conductivity and converts it into a processable electrical signal for output. This enables the system to directly obtain real-time information on the solution's state, providing accurate data for subsequent assessments and adjustments. The conductivity verification module then receives the solution's conductivity signal from the conductivity detection module and compares it with a preset conductivity threshold. If the solution's conductivity falls below the preset value, the verification module immediately generates and outputs a control command, ensuring the system can promptly detect insufficient solution levels and respond accordingly. Finally, upon receiving the control command from the conductivity verification module, the control module quickly responds, driving the pumping mechanism to pump the detergent from the storage tank into the dishwasher's water tank. This not only improves the dishwasher's cleaning performance but also significantly reduces the user experience and significantly reduces operational burden. Through the coordinated work of these four modules, the entire system realizes intelligent monitoring and automatic adjustment of the solution content in the dishwasher water tank, ensuring the efficient operation of the dishwasher.

[0010] Optionally, the power supply module includes a bridge rectifier circuit and a transformer T, the primary side coil of the transformer T is connected to the mains, and the secondary side coil of the transformer T is connected to the AC input end of the bridge rectifier circuit.

[0011] By adopting the above technical solution, when converting AC power into DC power, the transformer T converts the mains voltage into household voltage, and then the bridge rectifier current converts the converted AC voltage into DC voltage. The bridge rectifier circuit has a high degree of integration and the circuit connection is convenient and simple. At the same time, the bridge rectifier circuit has a good rectification effect, which can improve the rectification effect.

[0012] Optionally, the conductive detection module includes a conductive probe, which is arranged in the dishwasher water tank. The power supply end of the conductive probe is connected to the output end of the bridge rectifier circuit, and is used to transmit electrical signals into the water tank and detect the conductivity of the solution currently in the dishwasher water tank, and generate and output a solution conductivity signal based on the detection results.

[0013] By adopting the above technical solution, a conductive probe is installed in the conductivity detection module and placed directly within the dishwasher water tank. This ensures that the conductive probe can directly and in real time contact the solution within the water tank, accurately sensing changes in the solution's conductivity. Since conductivity is closely related to the ion concentration in the solution, the placement of the conductive probe provides the system with direct and reliable information on the solution's state, which is essential for ensuring monitoring accuracy. The power supply of the conductive probe is connected to the output of a bridge rectifier circuit. The bridge rectifier circuit provides a stable DC power supply for the conductive probe, ensuring accuracy and stability when transmitting electrical signals and detecting solution conductivity. By transmitting electrical signals into the water tank and detecting the solution's conductivity through the conductive probe, the conductivity detection module obtains real-time information on the solution's state. Based on the detection results, an electrical signal representing the solution's conductivity is generated and output. The system enables real-time monitoring of solution content, providing accurate data support for subsequent automatic adjustments, thereby achieving intelligent monitoring and automatic adjustment of the solution content within the dishwasher water tank.

[0014] Optionally, the conductivity inspection module includes a PLC controller, the power supply end of the PLC controller is connected to the output end of the bridge rectifier circuit, and the input end of the PLC controller is connected to the output end of the conductive probe, for receiving a solution conductivity signal and comparing the conductivity in the solution conductivity signal with a preset conductivity. When the conductivity is lower than the preset conductivity, a control instruction is generated and output.

[0015] By adopting the above technical solution, the PLC controller, as the core processing unit, can efficiently and accurately process all input signals. Its power supply is connected to the output of the bridge rectifier circuit, ensuring that the PLC controller operates in a stable and reliable power environment. The PLC controller's input is connected to the output of the conductivity probe. The PLC controller directly receives the solution conductivity signal output by the conductivity probe. This ensures real-time and accurate signal transmission, enabling the PLC controller to promptly understand changes in solution conductivity. The PLC controller monitors the solution state in real time, providing accurate data for subsequent comparisons and judgments. After receiving the solution conductivity signal, the PLC controller compares the conductivity with a preset conductivity value. This comparison allows the PLC controller to accurately determine whether the solution conductivity meets the preset standard. This improves the system's sensitivity to changes in solution conductivity, ensuring that the dishwasher consistently maintains optimal solution conditions during the cleaning process. When the PLC controller determines that the solution conductivity falls below the preset conductivity value, it generates and outputs a control command. By outputting this control command, the PLC controller intelligently adjusts the solution content in the dishwasher's water tank, ensuring that the solution remains in optimal conditions. It not only improves the cleaning effect of the dishwasher, but also reduces the frequency and difficulty of manual intervention, thereby improving the user experience.

[0016] Optionally, the control module includes a drive pump, the power supply end of the drive pump is connected to the output end of the bridge rectifier circuit, and the signal input end of the drive pump is connected to the output end of the PLC controller, for receiving and responding to control instructions to pump the machine washing liquid from the storage tank into the dishwasher water tank.

[0017] By adopting this technical solution, the drive pump in the control module serves as the power source for transferring the washing liquid. Its power supply is connected to the output of the bridge rectifier circuit, ensuring a stable, rectified power supply for the drive pump and preventing current fluctuations from affecting the pump's operational stability. Furthermore, the drive pump's signal input is directly connected to the output of the PLC controller, enabling the PLC to precisely control the pump's start, stop, and operating status. When the PLC issues a control command, the drive pump responds quickly, accurately and efficiently pumping the washing liquid from the storage tank into the dishwasher's water tank, ensuring a smooth dishwashing process and improving both efficiency and cleaning results.

[0018] Optionally, it also includes a content detection module, which includes a liquid level sensor. The liquid level sensor is arranged at a preset position on the inner wall of the storage tank and is used to detect the remaining content of the machine washing liquid in the storage tank. The output end of the liquid level sensor is connected to the input end of the PLC controller and outputs a content detection signal to the PLC controller.

[0019] By adopting this technical solution, the liquid level sensor in the content detection module is installed at a preset position on the inner wall of the storage tank, capable of accurately and in real time capturing the remaining amount of machine washing liquid in the storage tank. The liquid level sensor is connected to the input of the PLC controller, ensuring that the content detection signal is transmitted to the controller in a timely and accurate manner. Based on the received signal, the PLC controller can accurately determine the remaining amount of machine washing liquid and trigger the corresponding replenishment mechanism when necessary. This effectively avoids interruptions in dishwashing due to insufficient machine washing liquid, ensuring the continuity and efficiency of the dishwashing process.

[0020] Optionally, after receiving the content detection signal, the PLC controller determines whether the remaining content of the machine washing liquid in the content detection signal meets the preset content, and generates an alarm instruction when it does not meet the preset content.

[0021] By adopting this technical solution, the PLC controller can accurately determine the remaining amount of machine detergent based on the received signal and trigger the corresponding replenishment mechanism when necessary. This effectively avoids dishwashing interruptions caused by insufficient machine detergent and ensures the continuity and efficiency of the dishwashing process.

[0022] Optionally, an alarm module is further included, which includes an alarm. The signal input end of the alarm is connected to the signal output end of the PLC controller, and is used to respond to and execute the alarm instruction to issue a remaining content alarm after receiving the alarm instruction.

[0023] By adopting the above technical solution, when the PLC controller detects that the remaining material content in the system falls below a preset threshold, it immediately generates and sends an alarm command to the alarm module. The alarm in the alarm module, acting as a response execution unit, has its signal input connected to the signal output of the PLC controller, ensuring that it receives this alarm command immediately. Once the command is received, the alarm activates, emitting a distinct alarm signal, such as sound or light, to promptly alert operators to the insufficient material content, improving system reliability and operational continuity.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By adopting the above technical solution, the power supply module, as a foundational component, connects to the mains electricity supply to provide a stable voltage for the entire monitoring system, ensuring the normal operation of other modules in the system. A stable power supply is a prerequisite for the system to continuously and accurately monitor the conductivity of the solution in the water tank, providing a reliable energy source for subsequent automatic adjustments. Next, the conductivity detection module uses the voltage provided by the power supply module to monitor the conductivity of the solution in the dishwasher water tank in real time. This module accurately measures the solution's conductivity and converts it into a processable electrical signal for output. This enables the system to directly obtain real-time information on the solution's state, providing accurate data support for subsequent judgment and adjustments. The conductivity verification module then receives the solution conductivity signal output by the conductivity detection module and compares it with a preset conductivity threshold. If the solution's conductivity is detected to be below the preset value, the verification module immediately generates and outputs a control command. This ensures that the system can promptly detect insufficient solution content and respond accordingly. Finally, upon receiving the control command from the conductivity verification module, the control module quickly responds, driving the pumping mechanism to pump the machine wash liquid from the storage tank into the dishwasher water tank. This not only improves the cleaning effect of the dishwasher, but also greatly reduces the user's operating burden and enhances the user experience. Through the coordinated work of these four modules, the entire system realizes intelligent monitoring and automatic adjustment of the solution content in the dishwasher water tank, ensuring the efficient operation of the dishwasher;

[0026] 2. By adopting the above technical solution, the PLC controller, as the core processing unit, can efficiently and accurately process all input signals. Its power supply is connected to the output of the bridge rectifier circuit, ensuring that the PLC controller operates in a stable and reliable power environment. The PLC controller's input is connected to the output of the conductive probe. The PLC controller can directly receive the solution conductivity signal output by the conductive probe. This ensures real-time and accurate signal transmission, enabling the PLC controller to promptly understand changes in solution conductivity. The PLC controller can monitor the solution state in real time, providing accurate data support for subsequent comparisons and judgments. After receiving the solution conductivity signal, the PLC controller compares the conductivity with a preset conductivity. Through this comparison, the PLC controller can accurately determine whether the solution conductivity meets the preset standard. This improves the system's sensitivity to changes in solution conductivity, ensuring that the dishwasher maintains optimal solution conditions throughout the cleaning process. When the PLC controller determines that the solution conductivity falls below the preset conductivity, it generates and outputs a control command. By outputting this control command, the PLC controller intelligently adjusts the solution content in the dishwasher's water tank, ensuring that the solution remains in optimal conditions. It not only improves the cleaning effect of the dishwasher, but also reduces the frequency and difficulty of manual intervention, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall modules of a dishwasher water tank solution content monitoring system based on the conductivity method according to an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the power supply circuit of a dishwasher water tank solution content monitoring system based on the conductivity method in an embodiment of the present application.

[0029] Explanation of the accompanying symbols: 1. Power supply module; 2. Conductive detection module; 3. Conductive inspection module; 4. Control module; 5. Content detection module; 6. Bridge rectifier circuit; 7. Alarm module. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 This application is described in further detail.

[0031] The present application embodiment discloses a dishwasher water tank solution content monitoring system based on conductivity method. Figure 1The dishwasher consists of a power supply module 1, a conductivity detection module 2, a conductivity verification module 3, and a control module 4. When washing dishes, the power supply module 1 serves as the foundational component. Connected to the mains, it provides a stable voltage for the entire monitoring system, ensuring the proper operation of all other modules. A stable power supply is essential for the system to continuously and accurately monitor the conductivity of the solution in the water tank, providing a reliable energy source for subsequent automatic adjustments. Next, the conductivity detection module 2 uses the voltage provided by the power supply module 1 to monitor the conductivity of the solution in the dishwasher's water tank in real time. This module accurately measures the solution's conductivity and converts it into a processable electrical signal for output. This enables the system to directly obtain real-time information on the solution's state, providing accurate data support for subsequent judgments and adjustments. The conductivity verification module 3 then receives the solution conductivity signal output by the conductivity detection module 2 and compares it with a preset conductivity threshold. If the solution's conductivity is detected to be below the preset value, the verification module immediately generates and outputs a control command. This ensures that the system can promptly detect insufficient solution content and respond accordingly. Finally, upon receiving the control command from the conductivity detection module 3, the control module 4 quickly responds, driving the pumping mechanism to pump the washing liquid from the storage tank into the dishwasher's water tank. This not only improves the dishwasher's cleaning performance but also significantly reduces the user's operational burden, enhancing the user experience. Through the coordinated operation of these four modules, the entire system achieves intelligent monitoring and automatic adjustment of the liquid content in the dishwasher's water tank, ensuring efficient operation of the dishwasher.

[0032] Reference Figure 2 The power supply module 1 includes a bridge rectifier circuit 6 and a transformer T. The primary coil of the transformer T is connected to the mains, and the secondary coil of the transformer T is connected to the AC input terminal of the bridge rectifier circuit 6. When converting AC power to DC power, the transformer T converts the mains voltage to household voltage, and then the bridge rectifier circuit converts the converted AC voltage to DC voltage. The bridge rectifier circuit 6 has a high degree of integration and is convenient and simple to connect to the circuit. At the same time, the bridge rectifier circuit 6 has a good rectification effect, which can improve the rectification effect.

[0033] Reference Figure 1 and Figure 2The conductivity detection module 2 includes a conductive probe, which is placed in the dishwasher water tank. The power supply of the conductive probe is connected to the output of the bridge rectifier circuit 6. The probe is used to transmit an electrical signal into the water tank and detect the conductivity of the solution in the dishwasher water tank. Based on the detection results, a solution conductivity signal is generated and output. The conductive probe is placed directly in the dishwasher water tank. This ensures that the conductive probe can directly and in real time contact the solution in the water tank, accurately sensing changes in the solution's conductivity. Since conductivity is closely related to the ion concentration in the solution, the placement of the conductive probe provides the system with direct and reliable information about the solution's state, which is essential for ensuring monitoring accuracy. The power supply of the conductive probe is connected to the output of the bridge rectifier circuit 6. The bridge rectifier circuit 6 can output stable DC power, providing a stable power supply environment for the conductive probe. This ensures the accuracy and stability of the conductive probe in transmitting electrical signals and detecting solution conductivity. By transmitting electrical signals into the water tank and detecting the solution's conductivity through the conductive probe, the conductivity detection module 2 can obtain real-time information about the solution's state. Based on the detection results, an electrical signal representing the solution's conductivity is generated and output. The system can realize real-time monitoring of solution content, provide accurate data support for subsequent automatic adjustment, and thus realize intelligent monitoring and automatic adjustment of solution content in the dishwasher water tank.

[0034] Reference Figure 1The conductivity testing module 3 includes a PLC controller. Its power supply is connected to the output of the bridge rectifier circuit 6, and its input is connected to the output of the conductive probe. The controller receives the solution conductivity signal and compares the conductivity in the signal with a preset conductivity. When the conductivity is lower than the preset conductivity, the controller generates and outputs a control instruction. As the core processing unit, the PLC controller efficiently and accurately processes each input signal. Its power supply is connected to the output of the bridge rectifier circuit 6, ensuring that the controller operates in a stable and reliable power environment. The input of the PLC controller is connected to the output of the conductive probe. The controller directly receives the solution conductivity signal output by the conductive probe, ensuring real-time and accuracy of the signal, allowing the controller to promptly monitor changes in solution conductivity. The controller monitors the solution state in real time, providing accurate data support for subsequent comparisons and judgments. After receiving the solution conductivity signal, the controller compares the conductivity with the preset conductivity. Through this comparison, the controller accurately determines whether the solution conductivity meets the preset standard. This increases the system's sensitivity to changes in solution conductivity, ensuring the dishwasher maintains optimal solution conditions throughout the cleaning process. When the PLC controller determines that the solution conductivity falls below a preset level, it generates and outputs a control command. By outputting these control commands, the PLC intelligently adjusts the solution content within the dishwasher's water tank, ensuring the solution remains optimally maintained. This not only improves the dishwasher's cleaning performance but also reduces the frequency and difficulty of manual intervention, enhancing the user experience.

[0035] Reference Figure 1 and Figure 2 The control module 4 includes a drive pump. The power supply of the drive pump is connected to the output of the bridge rectifier circuit 6, and the signal input of the drive pump is connected to the output of the PLC controller. The drive pump is used to receive and respond to control commands to pump the machine washing liquid from the storage tank into the dishwasher water tank. The drive pump in the control module 4 serves as the power source for transmitting the machine washing liquid. Its power supply is connected to the output of the bridge rectifier circuit 6, ensuring that the drive pump can obtain a stable and rectified power supply, avoiding the impact of current fluctuations on the operational stability of the pump body. At the same time, the signal input of the drive pump is directly connected to the output of the PLC controller, allowing the PLC to accurately control the start and stop and operating status of the drive pump. When the PLC issues a control command, the drive pump can respond quickly, accurately and efficiently pumping the machine washing liquid in the storage tank into the dishwasher water tank, ensuring the smooth progress of the dishwashing process and improving dishwashing efficiency and cleaning results.

[0036] Reference Figure 1 and Figure 2The system also includes a content detection module 5, which includes a liquid level sensor located at a preset position on the inner wall of the storage tank. The sensor is used to detect the remaining level of machine washing liquid in the storage tank. The output of the liquid level sensor is connected to the input of a PLC controller, and the sensor outputs a content detection signal to the controller. The liquid level sensor in the content detection module 5 is located at a preset position on the inner wall of the storage tank and can accurately and timely capture the remaining level of machine washing liquid in the storage tank. The liquid level sensor is connected to the input of the PLC controller, ensuring that the content detection signal is transmitted to the controller in a timely and accurate manner. Based on the received signal, the PLC controller can accurately determine the remaining level of machine washing liquid and trigger the appropriate replenishment mechanism when necessary. This effectively avoids interruptions in the dishwashing process due to insufficient machine washing liquid, ensuring the continuity and efficiency of the dishwashing process.

[0037] Referring to the figure, after receiving the content detection signal, the PLC controller determines whether the remaining amount of machine washing liquid in the content detection signal meets the preset content. If not, it generates an alarm instruction. Based on the received signal, the PLC controller can accurately determine the remaining amount of machine washing liquid and trigger the corresponding replenishment mechanism when necessary. This effectively avoids dishwashing interruptions caused by insufficient machine washing liquid, ensuring the continuity and efficiency of the dishwashing process.

[0038] Reference Figure 1 , also includes an alarm module 7, the alarm module 7 includes an alarm, the signal input end of the alarm is connected to the signal output end of the PLC controller, and is used to respond to the execution of the alarm instruction and issue an alarm for the remaining content after receiving the alarm instruction. When the PLC controller detects that the remaining content of the material in the system is lower than the preset threshold, it will immediately generate and send an alarm instruction to the alarm module 7. The alarm in the alarm module 7, as a response execution unit, has its signal input end connected to the signal output end of the PLC controller to ensure that the alarm instruction can be received immediately. Once the instruction is received, the alarm will start and send out an obvious alarm signal, such as sound, light, etc., so as to promptly remind the operator to pay attention to the situation of insufficient remaining content of the material, thereby improving the reliability of the system and the continuity of operation.

[0039] The operating principle of a dishwasher water tank solution content monitoring system based on conductivity measurement in this embodiment is as follows: When a dishwasher is washing dishes, the power supply module 1, as a foundational component, connects to the mains electricity supply to provide a stable voltage for the entire monitoring system, ensuring the normal operation of other modules in the system. A stable power supply is a prerequisite for the system to continuously and accurately monitor the conductivity of the solution in the water tank, providing a reliable energy source for subsequent automatic adjustments. Next, the conductivity detection module 2 uses the voltage provided by the power supply module 1 to monitor the conductivity of the solution in the dishwasher water tank in real time. This module accurately measures the solution's conductivity and converts it into a processable electrical signal for output. This enables the system to directly obtain real-time information on the solution's state, providing accurate data support for subsequent judgment and adjustment. The conductivity verification module 3 then receives the solution conductivity signal output by the conductivity detection module 2 and compares it with a preset conductivity threshold. If the solution's conductivity is detected to be below the preset value, the verification module immediately generates and outputs a control command. This ensures that the system can promptly detect insufficient solution content and respond accordingly. Finally, upon receiving the control command from the conductivity detection module 3, the control module 4 quickly responds, driving the pumping mechanism to pump the washing liquid from the storage tank into the dishwasher's water tank. This not only improves the dishwasher's cleaning performance but also significantly reduces the user's operational burden, enhancing the user experience. Through the coordinated operation of these four modules, the entire system achieves intelligent monitoring and automatic adjustment of the liquid content in the dishwasher's water tank, ensuring efficient operation of the dishwasher.

[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A dishwasher water tank solution content monitoring system based on conductivity method, characterized by: It comprises a power supply module (1), a conductive detection module (2), a conductive inspection module (3) and a control module (4), wherein: The power supply module (1) is connected to the mains electricity and is used to provide voltage; The conductivity detection module (2) is connected to the power supply module (1) and is used to detect the conductivity of the solution in the dishwasher water tank, and to generate and output a solution conductivity signal based on the detection result; The conductivity inspection module (3) is connected to the output end of the power supply module (1) and the conductivity detection module (2), and is used to receive the solution conductivity signal, compare the conductivity in the solution conductivity signal with a preset conductivity, and generate and output a control instruction when the conductivity is lower than the preset conductivity; The control module (4) is connected to the output ends of the power supply module (1) and the conductive detection module (3), and is used to receive and respond to control instructions to pump the washing liquid from the storage tank into the dishwasher water tank.

2. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 1, characterized in that: The power supply module (1) comprises a bridge rectifier circuit (6) and a transformer T, wherein the primary side coil of the transformer T is connected to the mains, and the secondary side coil of the transformer T is connected to the AC input end of the bridge rectifier circuit (6).

3. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 2, characterized in that: The conductive detection module (2) includes a conductive probe, which is arranged in the dishwasher water tank. The power supply end of the conductive probe is connected to the output end of the bridge rectifier circuit (6) and is used to transmit an electrical signal into the water tank and detect the conductivity of the solution in the dishwasher water tank, and generate and output a solution conductivity signal based on the detection result.

4. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 3, characterized in that: The conductivity testing module (3) includes a PLC controller, a power supply end of the PLC controller is connected to the output end of the bridge rectifier circuit (6), and an input end of the PLC controller is connected to the output end of the conductive probe, and is used to receive a solution conductivity signal and compare the conductivity in the solution conductivity signal with a preset conductivity. When the conductivity is lower than the preset conductivity, a control instruction is generated and output.

5. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 4, characterized in that: The control module (4) includes a driving pump, the power supply end of the driving pump is connected to the output end of the bridge rectifier circuit (6), and the signal input end of the driving pump is connected to the output end of the PLC controller, and is used to receive and respond to control instructions to pump the machine washing liquid from the storage tank into the dishwasher water tank.

6. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 3, characterized in that: The invention also includes a content detection module (5), which includes a liquid level sensor, which is arranged at a preset position on the inner wall of the storage tank and is used to detect the remaining content of the machine washing liquid in the storage tank. The output end of the liquid level sensor is connected to the input end of the PLC controller and outputs a content detection signal to the PLC controller.

7. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 6, characterized in that: After receiving the content detection signal, the PLC controller determines whether the remaining content of the machine washing liquid in the content detection signal meets the preset content, and generates an alarm instruction when it does not meet the preset content.

8. The dishwasher water tank solution content monitoring system based on conductivity method according to claim 7, characterized in that: It also includes an alarm module (7), which includes an alarm. The signal input end of the alarm is connected to the signal output end of the PLC controller, and is used to respond to and execute the alarm instruction to issue a residual content alarm after receiving the alarm instruction.

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