Mobile container liquid level monitoring system

Abstract

The utility model discloses a mobile container liquid level monitoring system, which is characterized in that a throw-in type liquid level transmitter is arranged at the inner bottom of a mobile container and is connected with a main control circuit, so that the liquid level height of oil in an oil drum is measured by using the throw-in type liquid level transmitter; the height of the oil level in the oil drum can be measured more accurately, the situation that an infrared sensor located at the bottom of a long rod is covered by an oil film when measuring the height of the oil level in the oil drum is avoided, and accurate display of the height of the oil level is achieved.

Description

Technical Field

[0001] The present application relates to the field of monitoring devices, and in particular to a mobile container liquid level monitoring system. Background Art

[0002] At present, when monitoring the oil liquid in the oil barrel in the oil storage area, a long rod with a sensor at the bottom is generally used to penetrate into the oil barrel. A transmitter is set on the top of the sensor. The sensor and the transmitter are centrally powered by a power supply outside the oil barrel. However, the oil barrels in the oil storage area are often moved, and the centralized power supply method cannot meet the current needs. In addition, since the sensor is deep inside the oil barrel, the sensor probe is easily blinded by the oil liquid, resulting in inaccurate measurement data. Summary of the invention

[0003] The main purpose of the present application is to provide a mobile container liquid level monitoring system, which aims to solve the technical problem that when the sensor penetrates deep into the oil barrel, the sensor probe is easily obscured by the oil liquid, resulting in inaccurate measurement data.

[0004] To achieve the above-mentioned purpose, the present application provides a mobile container liquid level monitoring system, a main control circuit and a submersible liquid level transmitter, a power supply circuit and a display module respectively connected to the main control circuit; wherein the submersible liquid level transmitter is arranged at the inner bottom of the mobile container, and is used to collect the liquid level data of the mobile container; the power supply circuit is used to supply power to the main control circuit through a dry battery; and the display module is used to display the liquid level data.

[0005] Optionally, the ADC interface of the submersible liquid level transmitter is connected to the first general input and output pin of the main control circuit.

[0006] Optionally, the first input pin to the fourth input pin of the display module are respectively connected to the second general-purpose input-output pin to the fifth general-purpose input-output pin of the main control circuit.

[0007] Optionally, the power supply circuit includes a backup power supply circuit, which includes a first DC power supply, a battery pack power supply, a first capacitor, a first diode and a second diode; wherein, the first DC power supply is connected to the battery power supply pin of the main control circuit through the first diode; one end of the battery pack power supply is connected to the power supply pin of the main control circuit through the second diode, and the other end is grounded; one end of the first capacitor is connected to the power supply pin of the main control circuit, and the other end is grounded.

[0008] Optionally, the mobile container liquid level monitoring system also includes a wireless transmission module and a GPS module; wherein the input pin of the wireless transmission module is connected to the first serial communication pin, and the output pin is connected to the second serial communication pin; the input pin of the GPS module is connected to the third serial communication pin, and the output pin is connected to the fourth serial communication pin.

[0009] Optionally, the mobile container liquid level monitoring system also includes a synchronization circuit, which includes a clock crystal oscillator circuit and a system crystal oscillator circuit; the clock crystal oscillator circuit includes a first crystal oscillator unit, a second capacitor and a third capacitor; the system crystal oscillator circuit includes a second crystal oscillator unit, a fourth capacitor, a fifth capacitor and a first resistor; wherein the first end of the first crystal oscillator unit is connected to the sixth general-purpose input-output pin, and the second end of the first crystal oscillator unit is connected to the seventh general-purpose input-output pin; one end of the second capacitor is connected to the first end of the first crystal oscillator unit, and the other end of the second capacitor is grounded; one end of the third capacitor is connected to the second end of the first crystal oscillator unit, and the other end of the third capacitor is grounded; the second crystal oscillator unit and the first resistor constitute a first parallel branch, the first end of the first parallel branch is connected to the eighth general-purpose input-output pin, and the second end of the first parallel branch is connected to the ninth general-purpose input-output pin; one end of the fourth capacitor is connected to the first end of the first parallel branch, and the other end of the fourth capacitor is grounded; one end of the fifth capacitor is connected to the second end of the first parallel branch, and the other end of the fifth capacitor is grounded.

[0010] Optionally, the mobile container liquid level monitoring system also includes an alarm circuit, which includes an electromagnetic relay, an alarm light, a third diode, a transistor, a second resistor, an eighth capacitor and a third resistor; wherein the first end of the electromagnetic relay is connected to the second DC power supply, and the second end and the third end are respectively connected to the first end and the second end of the alarm light; the collector of the transistor is connected to the fourth end of the electromagnetic relay, and the emitter of the transistor is grounded; the second resistor and the eighth capacitor constitute a third parallel circuit, the first end of the third parallel circuit is connected to the base of the transistor, and the second end of the third parallel circuit is grounded; one end of the third resistor is connected to the first end of the third parallel circuit, and the other end of the third resistor is connected to the fifth serial communication interface of the main control circuit.

[0011] Optionally, the mobile container liquid level monitoring system also includes an alarm button circuit, the button circuit includes a first sub-button circuit, a second sub-button circuit and a third sub-button circuit; the first sub-button circuit includes a first button and a first RC parallel branch; the second sub-button circuit includes a second button and a second RC parallel branch; the third sub-button circuit includes a third button and a third RC parallel branch; wherein the first end of the first button is connected to the first DC power supply, and the second end of the first button is connected to the reset pin of the main control circuit; the first end of the first RC parallel branch is connected to the second end of the first button, and the second end of the first RC parallel branch is grounded; the first end of the second button is connected to the first DC power supply, and the second end of the second button is connected to the first debugging pin of the main control circuit; the first end of the second RC parallel branch is connected to the second end of the first button, and the second end of the second RC parallel branch is grounded; the first end of the third button is connected to the first DC power supply, and the second end is connected to the second debugging pin of the main control circuit; the first end of the third RC parallel branch is connected to the second end of the first button, and the second end of the third RC parallel branch is grounded;

[0012] Optionally, the mobile container liquid level monitoring system further includes a server, and the server is electrically connected to the wireless transmission module and the GPS module respectively.

[0013] Optionally, the mobile container liquid level monitoring system further includes a terminal device, and the terminal device is electrically connected to the server.

[0014] A mobile container liquid level monitoring system proposed in an embodiment of the present application, by setting a immersive liquid level transmitter at the inner bottom of the mobile container and connecting the immersive liquid level transmitter to the main control circuit, so as to use the immersive liquid level transmitter to measure the oil liquid level inside the oil barrel, the oil liquid level in the oil barrel can be measured more accurately, and the situation that the infrared sensor located at the bottom of the long rod is avoided. The situation that the infrared sensor at the bottom of the long rod is covered by the oil film when measuring the oil liquid level inside the oil barrel, realizes the accurate display of the oil liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a mobile container liquid level monitoring system provided in one embodiment of the present application;

[0016] Figure 2 A circuit diagram of a mobile container liquid level monitoring system provided in one embodiment of the present application.

[0017] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0018] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] Figure 1 This is a schematic diagram of the structure of a mobile container liquid level monitoring system provided by an embodiment of the present application. This embodiment can be used to solve the technical problem that when the sensor is inserted deep into the oil drum, the sensor probe is easily obscured by the oil liquid, resulting in inaccurate measurement data. Figure 1 The mobile container liquid level monitoring system may include a main control circuit 100 and a submersible liquid level transmitter 200, a power supply circuit 300 and a display module 400 respectively connected to the main control circuit 100; wherein the submersible liquid level transmitter 200 is arranged at the inner bottom of the mobile container and can be used to collect the liquid level data of the mobile container; the power supply circuit 300 can be used to supply power to the main control circuit 100; the main control circuit 100 is used to transmit the liquid level data output by the submersible liquid level transmitter 200 to the display module 400 for display.

[0020] It should be noted that the immersion liquid level transmitter 200 can be an immersion pressure transmitter (also called a liquid level probe). The immersion pressure transmitter is a special pressure transmitter that can be used to measure the static liquid level and can be used in water tanks, wells, shafts, and hole environments. The immersion pressure transmitter is directly immersed in the liquid and installed as close to the bottom as possible. The current liquid level, that is, the height of the liquid column above it, is calculated by measuring the static pressure.

[0021] In the embodiment of the present application, the main control circuit 100 is installed in a sealed box body, and the power supply circuit 300 can be powered by a storage battery or an external first DC power supply VCC3.3. When the main control circuit 100 is powered by the external first DC power supply VCC3.3, the connection between the power supply line and the sealed box body needs to be waterproofed; when the main control circuit 100 is powered by a battery, the battery is fixed inside the sealed box body. Exemplarily, the power supply circuit 300 supplies power to the main control circuit 100 through a dry cell. The display module 400 can be set on the outer wall of the oil drum and fixed to the main control circuit 100 in the sealed box body by wire. When the display module 400 is connected to the sealed box body by wire, the connection between the line and the sealed box body should also be waterproofed. The submersible liquid level transmitter 200 can be bound to the outer wall of the sealed box body. When the submersible liquid level transmitter 200 is connected to the main control circuit 100 in the sealed box body, the connection line also needs to be waterproofed when passing through the sealed box body.

[0022] In this embodiment, Figure 2 A circuit diagram of a mobile container liquid level monitoring system provided in an embodiment of the present application, refer to Figure 2The ADC interface of the submersible liquid level transmitter 200 is connected to the first general input and output pin of the main control circuit 100. The submersible liquid level transmitter 200 is used to convert the collected liquid level data into digital liquid level data and output it to the main control circuit 100; the main control circuit 100 is used to transmit the digital liquid level data to the display module 400 for display.

[0023] Exemplarily, the main control circuit 100 may be, for example, an ARM M3 core series single chip microcomputer, and the submersible liquid level transmitter 200 may be, for example, an LS-10 submersible liquid level transmitter / pressure transmitter. The submersible liquid level transmitter 200 may be connected to the general input and output pin PA0 of the main control circuit 100 via the ADC pin. The submersible liquid level transmitter 200 inputs the collected liquid level data into the main control circuit 100, and the main control circuit 100 displays the liquid level data via the display module 400.

[0024] In this embodiment, continue to refer to Figure 2 , the first input pin to the fourth input pin of the display module 400 are respectively connected to the second general-purpose input-output pin to the fifth general-purpose input-output pin of the main control circuit 100, and the display module 400 is used to obtain and display the digital liquid level data output by the main control circuit 100. Exemplarily, the display module 400 can adopt a 3.2-inch SPI serial port TFT LCD screen. The first input pin to the fourth input pin of the display module 400 can be connected to the general-purpose input-output pins PA4 to PA7 respectively. The display module 400 can be used for real-time display of oil level information, system information, network information and positioning information.

[0025] In this embodiment, continue to refer to Figure 2 The power supply circuit 300 may include a backup power supply circuit 1000, and the backup power supply circuit 1000 may include a first DC power supply VCC3.3, a battery pack power supply BATT, a first capacitor C201, a first diode D202 and a second diode D201, wherein the first DC power supply VCC3.3 is connected to the cathode end of the first diode D202, and the anode end of the first diode D202 is connected to the battery power supply pin of the main control circuit 100; one end of the battery pack power supply BATT is connected to the cathode end of the second diode D201, and the anode end of the second diode D201 is connected to the power supply pin of the main control circuit 100, and the other end is grounded; one end of the first capacitor C201 is connected to the power supply pin of the main control circuit 100, and the other end is grounded.

[0026] Specifically, the first diode D202 is located between the first DC power supply VCC3.3 and the main control circuit 100, which can improve the reliability of the entire circuit. For example, when the first DC power supply VCC3.3 is short-circuited or the main control circuit 100 is damaged, the first diode D202 can prevent the fault from spreading to other parts, thereby reducing the risk of damage to the entire system. The second diode D201 is located between the battery pack power supply BATT and the main control circuit 100, and the second diode D201 plays the same role as the first diode D202. The first capacitor C201 is connected in parallel to the battery pack power supply BATT and can be used as a voltage buffer. When the change of the main control circuit 100 causes voltage fluctuations, the first capacitor C201 can be quickly charged and discharged to maintain the voltage stability of the battery terminal. The backup power supply circuit 1000 and the clock crystal oscillator circuit 1100 together constitute the clock crystal oscillator to provide clock synchronization for the main control circuit 100, and the backup power supply circuit 1000 and the system crystal oscillator circuit 1200 together constitute the system crystal oscillator to provide system synchronization for the main control circuit 100.

[0027] In this embodiment, continue to refer to Figure 2 The mobile container liquid level monitoring system may also include a wireless transmission module 500 and a GPS module 600; the input pin of the wireless transmission module 500 is connected to the first serial communication pin of the main control circuit 100, and the output pin is connected to the second serial communication pin of the main control circuit 100; the input pin of the GPS module 600 is connected to the third serial communication pin of the main control circuit 100, and the output pin is connected to the fourth serial communication pin of the main control circuit 100; the GPS module 600 is used to obtain the location information of the mobile container; the main control circuit 100 sends the liquid level data and the location information of the mobile container to the remote through the wireless transmission module 500. The wireless transmission module 500 may be, for example, a 4G module.

[0028] Specifically, the input pin of the wireless transmission module 500 is connected to the USART output pin PA2, and the output pin is connected to the USART input pin PA3. The input pin of the GPS module 600 is connected to the SCL USART pin, and the output pin is connected to the SDA USART pin.

[0029] It should be noted that USART (Universal Synchronous / Asynchronous Receiver / Transmitter) is a commonly used serial communication interface.

[0030] In this embodiment, continue to refer to Figure 2The mobile container liquid level monitoring system may further include a synchronization circuit, which may include a clock crystal oscillator circuit 1100 and a system crystal oscillator circuit 1200; the clock crystal oscillator circuit 1100 may include a first crystal oscillator unit Y201, a second capacitor C202 and a third capacitor C205; the system crystal oscillator circuit 1200 may include a second crystal oscillator unit Y202, a fourth capacitor C203, a fifth capacitor C206 and a first resistor R203; wherein a first end of the first crystal oscillator unit Y201 is connected to the sixth general-purpose input / output pin, and a second end of the first crystal oscillator unit Y201 is connected to the seventh general-purpose input / output pin; one end of the second capacitor C202 is connected to the first crystal The first end of the crystal oscillator unit Y201 and the other end of the second capacitor C202 are grounded; one end of the third capacitor C205 is connected to the second end of the first crystal oscillator unit Y201, and the other end of the third capacitor C205 is grounded; the second crystal oscillator unit Y202 and the first resistor R203 form a first parallel branch, the first end of the first parallel branch is connected to the eighth general-purpose input-output pin, and the second end of the first parallel branch is connected to the ninth general-purpose input-output pin; one end of the fourth capacitor C203 is connected to the first end of the first parallel branch, and the other end of the fourth capacitor C203 is grounded; one end of the fifth capacitor C206 is connected to the second end of the first parallel branch, and the other end of the fifth capacitor C206 is grounded.

[0031] In this embodiment, continue to refer to Figure 2 The mobile container liquid level monitoring system may further include an alarm circuit 1400, which may include an electromagnetic relay JK101, an alarm light P101, a third diode M7, a transistor Q102, a second resistor R109, an eighth capacitor C103, and a third resistor R108; two coil terminals of the electromagnetic relay JK101 are respectively connected to the second DC power supply VCC5 and the first connection end of the transistor Q102, two normally closed contacts of the electromagnetic relay JK101 are respectively connected to the first end and the second end of the alarm light P101, and the electromagnetic relay JK101 is connected to the second end of the electromagnetic relay JK101. The two normally open contacts of K101 are suspended; the second resistor R109 and the eighth capacitor C103 form a third parallel circuit, the base of the transistor Q102 is connected to the first end of the third parallel circuit, the second end of the third parallel circuit is grounded, and the second connection end of the transistor Q102 is grounded; one end of the third resistor R108 is connected to the first end of the third parallel circuit, and the other end of the third resistor R108 is connected to the fifth serial communication interface of the main control circuit 100; the anode end of the third diode M7 is connected to the second DC power supply VCC5, and the cathode end is connected to the first connection end of the transistor Q102.

[0032] Specifically, the third parallel circuit composed of the second resistor R109 and the eighth capacitor C103, the third resistor R108 and the transistor Q102 together constitute a basic amplifier circuit, which can control the switch of the electromagnetic relay JK101. When the main control circuit 100 outputs a control signal, the basic amplifier circuit can control the two coil terminals of the electromagnetic relay JK101 to be turned on. At this time, the two normally open contacts of the electromagnetic relay are closed, the two normally closed contacts of the electromagnetic relay are opened, the alarm circuit 1400 forms a loop, and the alarm light P101 starts to flash. When the main control circuit 100 has no output control signal, the two coil terminals of JK101 are disconnected, the two normally closed contacts of the electromagnetic relay are closed, the two normally open contacts of the electromagnetic relay are opened, and the alarm circuit 1400 is disconnected.

[0033] In this embodiment, continue to refer to Figure 2 The mobile container liquid level monitoring system may further include an alarm button circuit 1300, and the button circuit 1300 may include a first sub-button circuit, a second sub-button circuit, and a third sub-button circuit; the first sub-button circuit may include a first button KEY201 and a first RC parallel branch; the second sub-button circuit may include a second button KEY202 and a second RC parallel branch; the third sub-button circuit may include a third button KEY203 and a third RC parallel branch; wherein a first end of the first button KEY201 is connected to a first DC power supply VCC3.3, a second end of the first button KEY201 is connected to a reset pin of the main control circuit 100; a first end of the first RC parallel branch ... The second end of the first button KEY201 is connected, and the second end of the first RC parallel branch is grounded; the first end of the second button KEY202 is connected to the first DC power supply VCC3.3, and the second end of the second button KEY202 is connected to the first debugging pin of the main control circuit 100; the first end of the second RC parallel branch is connected to the second end of the second button KEY202, and the second end of the second RC parallel branch is grounded; the first end of the third button KEY203 is connected to the first DC power supply VCC3.3, and the second end is connected to the second debugging pin of the main control circuit 100; the first end of the third RC parallel branch is connected to the second end of the third button KEY203, and the second end of the third RC parallel branch is grounded.

[0034] When the first button KEY201 is pressed, the main control circuit 100 is reset, and when the second button KEY202 or the third button KEY203 is pressed, the main control circuit 100 can reset and debug the submersible liquid level transmitter 200. The first RC parallel branch can stabilize the output voltage of the first button KEY201, the second RC parallel branch can stabilize the output voltage of the second button KEY202, and the third RC parallel branch can stabilize the output voltage of the third button KEY203.

[0035] In this embodiment, continue to refer to Figure 1 The mobile container liquid level monitoring system may further include a server 700, which is electrically connected to the wireless transmission module 500 and the GPS module 600. The wireless transmission module 500 may remotely send the liquid level data and positioning data in the local oil barrel to the server.

[0036] In this embodiment, continue to refer to Figure 1 The mobile container liquid level monitoring system may further include a terminal device 800 , which is electrically connected to the server 700 ; the terminal device 800 receives the liquid level data and the location information of the mobile container sent by the server 700 .

[0037] The terminal device 800 may be a mobile phone or a PC, and the terminal device 800 may be used to receive the liquid level data in the oil barrel and the positioning data of the oil barrel received by the server.

[0038] It should be noted that the mobile container liquid level monitoring system may further include an input module 900 , and the input module 900 may be used to input control instructions.

[0039] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A mobile container liquid level monitoring system, characterized in that: include: A main control circuit and a submersible liquid level transmitter, a power supply circuit and a display module respectively connected to the main control circuit, wherein the main control circuit, the power supply circuit and the display module are all fixed to the mobile container; Wherein, the immersion type liquid level transmitter is located at the inner bottom of the mobile container and is used to collect the liquid level data of the mobile container; The power supply circuit is used to supply power to the main control circuit; The main control circuit is used to transmit the liquid level data output by the immersion liquid level transmitter to the display module for display.

2. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The ADC interface of the submersible liquid level transmitter is connected to the first general input and output pin of the main control circuit; The immersion type liquid level transmitter is used to convert the collected liquid level data into digital liquid level data and output it to the main control circuit; The main control circuit is used to transmit the liquid level data of the digital quantity to the display module for display.

3. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The first input pin to the fourth input pin of the display module are respectively connected to the second general input and output pin to the fifth general input and output pin of the main control circuit, and the display module is used to obtain and display the digital liquid level data output by the main control circuit.

4. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The power supply circuit includes a backup power supply circuit, and the backup power supply circuit includes a first DC power supply, a battery pack power supply, a first capacitor, a first diode and a second diode; Wherein, the first DC power supply is connected to the cathode end of the first diode, and the anode end of the first diode is connected to the battery power supply pin of the main control circuit; One end of the battery pack power supply is connected to the cathode end of the second diode, the anode end of the second diode is connected to the power supply pin of the main control circuit, and the other end is grounded; One end of the first capacitor is connected to the power supply pin of the main control circuit, and the other end is grounded.

5. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The mobile container liquid level monitoring system also includes a wireless transmission module and a GPS module; The input pin of the wireless transmission module is connected to the first serial communication pin of the main control circuit, and the output pin is connected to the second serial communication pin of the main control circuit; The input pin of the GPS module is connected to the third serial communication pin of the main control circuit, and the output pin is connected to the fourth serial communication pin of the main control circuit; The GPS module is used to obtain the location information of the mobile container; Wherein, the main control circuit sends the liquid level data and the position information of the mobile container to a remote location through the wireless transmission module.

6. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The mobile container liquid level monitoring system also includes a synchronization circuit, the synchronization circuit includes a clock crystal oscillator circuit and a system crystal oscillator circuit, the clock crystal oscillator circuit includes a first crystal oscillator unit, a second capacitor and a third capacitor; the system crystal oscillator circuit includes a second crystal oscillator unit, a fourth capacitor, a fifth capacitor and a first resistor; Wherein, the first end of the first crystal oscillator unit is connected to the sixth general-purpose input-output pin of the main control circuit, and the second end of the first crystal oscillator unit is connected to the seventh general-purpose input-output pin of the main control circuit; One end of the second capacitor is connected to the first end of the first crystal oscillator unit, and the other end of the second capacitor is grounded; One end of the third capacitor is connected to the second end of the first crystal oscillator unit, and the other end of the third capacitor is grounded; The second crystal oscillator unit and the first resistor form a first parallel branch, a first end of the first parallel branch is connected to an eighth general-purpose input / output pin of the main control circuit, and a second end of the first parallel branch is connected to a ninth general-purpose input / output pin of the main control circuit; One end of the fourth capacitor is connected to the first end of the first parallel branch, and the other end of the fourth capacitor is grounded; One end of the fifth capacitor is connected to the second end of the first parallel branch, and the other end of the fifth capacitor is grounded.

7. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The mobile container liquid level monitoring system also includes an alarm circuit, which includes an electromagnetic relay, an alarm lamp, a third diode, a triode, a second resistor, an eighth capacitor and a third resistor; The two coil terminals of the electromagnetic relay are respectively connected to the second DC power supply and the first connection end of the transistor, the two normally open contacts of the electromagnetic relay are respectively connected to the first end and the second end of the alarm light, and the two normally closed contacts of the electromagnetic relay are suspended; The second resistor and the eighth capacitor form a third parallel circuit, the base of the transistor is connected to the first end of the third parallel circuit, the second end of the third parallel circuit is grounded, and the second connection end of the transistor is grounded; One end of the third resistor is connected to the first end of the third parallel circuit, and the other end of the third resistor is connected to the fifth serial communication interface of the main control circuit; The anode end of the third diode is connected to the second DC power supply, and the cathode end is connected to the first connection end of the transistor.

8. A mobile container liquid level monitoring system as claimed in claim 1, characterized in that: The mobile container liquid level monitoring system also includes a key circuit, the key circuit includes a first sub-key circuit, a second sub-key circuit and a third sub-key circuit; the first sub-key circuit includes a first key and a first RC parallel branch; the second sub-key circuit includes a second key and a second RC parallel branch; the third sub-key circuit includes a third key and a third RC parallel branch; Wherein, the first end of the first button is connected to the first DC power supply, and the second end of the first button is connected to the reset pin of the main control circuit; the first end of the first RC parallel branch is connected to the second end of the first button, and the second end of the first RC parallel branch is grounded; A first end of the second button is connected to a first DC power supply, and a second end of the second button is connected to a first debugging pin of the main control circuit; a first end of the second RC parallel branch is connected to a second end of the first button, and a second end of the second RC parallel branch is grounded; The first end of the third button is connected to the first DC power supply, and the second end is connected to the second debugging pin of the main control circuit; the first end of the third RC parallel branch is connected to the second end of the first button, and the second end of the third RC parallel branch is grounded.

9. A mobile container liquid level monitoring system as claimed in claim 5, characterized in that: The mobile container liquid level monitoring system also includes a server, which is connected to the wireless transmission module and is used to receive the liquid level data and the location information of the mobile container sent by the wireless transmission module.

10. A mobile container liquid level monitoring system as claimed in claim 9, characterized in that: The mobile container liquid level monitoring system further includes a terminal device, and the terminal device is communicatively connected with the server; The terminal device receives the liquid level data and the location information of the mobile container sent by the server.

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