Environment monitoring terminal of safety monitoring system of aluminum electrolysis multifunctional unit

Abstract

The invention discloses an environment monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system. The environment monitoring terminal comprises a power supply circuit, a microcontroller circuit, a smoke detection circuit, a hydrogen fluoride detection circuit, a sulfur dioxide detection circuit, a carbon monoxide detection circuit, a CAN bus communication circuit and an industrial serial port touch screen circuit. The concentration values of smoke, hydrogen fluoride, sulfur dioxide and carbon monoxide are monitored in real time through the microcontroller and displayed on the industrial serial port touch screen circuit in real time, and the concentration values are uploaded to the safety monitoring system of the aluminum electrolysis multifunctional unit through the CAN bus communication circuit to give an alarm, so that operators and maintenance personnel are prompted to carry out protection, and the personal safety of the operators is guaranteed.

Description

Technical Field

[0001] The present invention relates to the electronic technology field of an environmental monitoring terminal of a safety monitoring system for an aluminum electrolysis multi-functional unit. Background Art

[0002] An aluminum electrolysis multi-functional unit is an important mechanized operating device in the electrolytic aluminum workshop of an electrolytic aluminum enterprise. It is a special bridge crane that can complete operations such as crust breaking, anode changing, supplementary covering material adding, slag cleaning, liquid discharging, anode busbar lifting, hoisting the upper and lower structures of the electrolytic cell, and other miscellaneous operations for pre-baked anode electrolytic cells. The safety monitoring system for an aluminum electrolysis multi-functional unit is an intelligent system that specifically monitors, analyzes, and gives early warnings on the operating status, working environment, and operating behaviors of an aluminum electrolysis multi-functional unit. It can improve the safety of an aluminum electrolysis multi-functional unit, reduce the risk of accidents, and effectively trace accident data after an accident occurs. An aluminum electrolysis multi-functional unit is a device that works in an aluminum electrolysis workshop for a long time, and its operators and maintenance personnel work in poisonous gases such as alumina dust, hydrogen fluoride, sulfur dioxide, and carbon monoxide for a long time. The "Occupational Exposure Limits for Hazardous Agents in the Workplace - Part 1: Chemical Hazardous Agents" of the state stipulates the maximum values, short-term values, long-term values, etc. of harmful gases such as hydrogen fluoride, sulfur dioxide, and carbon monoxide. However, at present, most of the safety monitoring systems for aluminum electrolysis multi-functional units monitor working actions, working parameters, working videos, etc., and rarely monitor the working environment of operators and maintenance personnel. Therefore, an environmental monitoring terminal capable of monitoring the environment of a safety monitoring system for an aluminum electrolysis multi-functional unit is needed to monitor the parameters of alumina dust, hydrogen fluoride, sulfur dioxide, and carbon monoxide in real time, give alarms and early warnings in real time, and ensure the personal safety of operators. Summary of the Invention

[0003] The technical problem to be solved by the present invention is an environmental monitoring terminal of a safety monitoring system for an aluminum electrolysis multi-functional unit, which can collect alumina dust, hydrogen fluoride, sulfur dioxide, carbon monoxide, etc. in the workplaces of operators and maintenance personnel of an aluminum electrolysis multi-functional unit in real time, display them, and upload the monitored data to the safety monitoring system of the aluminum electrolysis multi-functional unit. The safety monitoring system records and analyzes the data. If the limit value is exceeded, an alarm is given to prompt operators and maintenance personnel to take protection measures to ensure the personal safety of operators.

[0004] The technical solution of the present invention is: An environmental monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system, including a power supply circuit, a microcontroller circuit, a smoke and dust detection circuit, a hydrogen fluoride detection circuit, a sulfur dioxide detection circuit, a carbon monoxide detection circuit, a CAN bus communication circuit, and an industrial serial port touch screen circuit; through the microcontroller, the concentration values of smoke and dust, hydrogen fluoride, sulfur dioxide, and carbon monoxide are monitored in real time, displayed in real time on the industrial serial port touch screen circuit, and uploaded to the aluminum electrolysis multifunctional unit safety monitoring system through the CAN bus communication circuit for alarm, prompting operators and maintenance personnel to take protection and ensuring the personal safety of operators.

[0005] The power supply circuit is composed of a varistor, an AC / DC module, a linear power supply chip, a first capacitor, a second capacitor, and a transient voltage suppression diode; the input AC power supply is an AC 220V power supply; the AC voltage phase line input terminal AC(L) of the AC / DC module is connected to the AC power supply phase line AC220V(L), the AC voltage neutral line input terminal AC(N) is connected to the AC power supply neutral line AC220V(N), the DC voltage positive output terminal +Vo outputs the first power supply V1, and the DC voltage negative output terminal -Vo outputs the common ground GND; the varistor is connected between the AC voltage phase line input terminal AC(L) and the AC voltage neutral line input terminal AC(N) of the AC / DC module to play an overvoltage protection role; the first capacitor is connected between the DC voltage positive output terminal +Vo and the DC voltage negative output terminal -Vo of the AC / DC module; the pin 1 of the transient voltage suppression diode is connected to the DC voltage positive output terminal +Vo of the AC / DC module, and the pin 2 is connected to the DC voltage negative output terminal -Vo of the AC / DC module; the power input terminal VIN of the linear power supply chip is connected to the DC voltage positive output terminal +Vo of the AC / DC module, the power ground terminal GND is connected to the DC voltage negative output terminal -Vo of the AC / DC module, and the power output terminal VOUT outputs the second power supply V2, which is connected to the common ground GND through the second capacitor.

[0006] The microcontroller circuit is composed of a microcontroller; the power input terminal VDD of the microcontroller is connected to the second power supply V2, and the power ground VSS of the microcontroller is connected to the common ground GND.

[0007] The soot detection circuit consists of a soot detection sensor, an MOS transistor, and a first resistor. The LED power input terminal V-LED and the power input terminal VCC of the soot detection sensor are connected to the first power supply V1. The LED power ground terminal LED-GND and the power ground terminal GND are connected to the common ground GND. The LED drive terminal LEDDRV is connected to the drain of the MOS transistor. The soot concentration output terminal VO is connected to the first analog input terminal ADC1 of the microcontroller. The MOS transistor outputs a pulse signal to control the operation of the LED drive terminal LEDDRV of the soot detection sensor. The gate of the MOS transistor is connected to the pulse width modulation output terminal PWM of the microcontroller through the first resistor, and the source is connected to the common ground GND.

[0008] The hydrogen fluoride detection circuit consists of a first voltage reference chip, a first operational amplifier, a hydrogen fluoride sensor, a second operational amplifier, a temperature detection chip, a second resistor, a third resistor, and a third capacitor. The power input terminal VCC of the first voltage reference chip is connected to the first power supply V1. The power ground terminal GND is connected to the common ground GND. The voltage reference output terminal VREF outputs a reference voltage. The first operational amplifier provides the current required for the operation of the hydrogen fluoride sensor. The non-inverting input terminal IN+ of the first operational amplifier is connected to the voltage reference output terminal VREF of the first voltage reference chip. The inverting input terminal IN- is connected to the reference electrode RE of the hydrogen fluoride sensor. The output terminal OUT is connected to the counter electrode CE of the hydrogen fluoride sensor. The working electrode WE of the hydrogen fluoride sensor is connected to the inverting input terminal IN- of the second operational amplifier through the second resistor. The second operational amplifier amplifies the output current signal of the hydrogen fluoride sensor. The second operational amplifier is connected as an inverting proportional circuit. The inverting input terminal IN- of the second operational amplifier is connected to the output terminal OUT of the second operational amplifier through the third resistor. The non-inverting input terminal IN+ is connected to the voltage reference output terminal VREF of the first voltage reference chip. The output terminal OUT is connected to the second analog input terminal ADC2 of the microcontroller. At the same time, the output terminal OUT is connected to the common ground GND through the third capacitor. The third capacitor has a high-frequency filtering effect. The temperature detection chip measures the ambient temperature and provides data for the temperature compensation of the hydrogen fluoride sensor. The power input terminal VCC of the temperature detection chip is connected to the first power supply V1. The power ground terminal GND is connected to the common ground GND. The temperature output terminal VOUT is connected to the third analog input terminal ADC3 of the microcontroller.

[0009] The sulfur dioxide detection circuit consists of a second voltage reference chip, a third operational amplifier, a sulfur dioxide sensor, a fourth operational amplifier, a fourth resistor, a fifth resistor, and a fourth capacitor. The power input terminal VCC of the second voltage reference chip is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the voltage reference output terminal VREF outputs a reference voltage. The third operational amplifier provides the current required for the operation of the sulfur dioxide sensor. The non-inverting input terminal IN+ of the third operational amplifier is connected to the voltage reference output terminal VREF of the second voltage reference chip, the inverting input terminal IN- is connected to the reference electrode RE of the sulfur dioxide sensor, and the output terminal OUT is connected to the counter electrode CE of the sulfur dioxide sensor. The working electrode WE of the sulfur dioxide sensor is connected to the inverting input terminal IN- of the fourth operational amplifier through the fourth resistor. The fourth operational amplifier amplifies the output current signal of the sulfur dioxide sensor. The fourth operational amplifier is connected as an inverting proportional circuit. The inverting input terminal IN- of the fourth operational amplifier is connected to the output terminal OUT of the fourth operational amplifier through the fifth resistor, the non-inverting input terminal IN+ is connected to the voltage reference output terminal VREF of the second voltage reference chip, and the output terminal OUT is connected to the fourth analog input terminal ADC4 of the microcontroller. At the same time, the output terminal OUT is connected to the common ground GND through the fourth capacitor. The fourth capacitor has a high-frequency filtering effect.

[0010] The carbon monoxide detection circuit consists of a carbon monoxide sensor, a fifth operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, and a fifth capacitor. The carbon monoxide sensor is an electrically heated gas-sensitive sensor. One port HEAT1 of the heating resistor of the carbon monoxide sensor is connected to the first power supply V1, the second port HEAT2 of the heating resistor is connected to the common ground GND through the eighth resistor, one port QM1 of the gas-sensitive detection is connected to the first power supply V1, the second port QM2 of the gas-sensitive detection is connected to the non-inverting input terminal IN+ of the fifth operational amplifier, and is also connected to the common ground GND through the seventh resistor. The fifth operational amplifier is connected as a voltage follower. The inverting input terminal IN- of the fifth operational amplifier is connected to the output terminal OUT of the fifth operational amplifier, and the output terminal OUT is connected to the fifth analog input terminal ADC5 of the microcontroller through the sixth resistor. At the same time, the output terminal OUT is connected to the common ground GND through the fifth capacitor. The fifth capacitor has a high-frequency filtering effect.

[0011] The CAN bus communication circuit consists of a CAN transceiver chip and communicates with the CAN bus of the safety monitoring system. The power input terminal VCC of the CAN transceiver chip is connected to the second power supply V2, the power ground GND is connected to the common ground GND, the CAN bus high-level terminal CANH is connected to the CANH of the CAN bus of the safety monitoring system, the CAN bus low-level terminal CANL is connected to the CANL of the CAN bus of the safety monitoring system, the transmitting terminal TXD is connected to the CAN bus transmitting terminal CANTX of the microcontroller, and the receiving terminal RXD is connected to the CAN bus receiving terminal CANRX of the microcontroller.

[0012] The industrial serial touch screen circuit consists of an RS232 chip and an industrial serial touch screen. The RS232 chip is connected to the microcontroller in the RS232 manner. The TTL transmit end T1IN of the RS232 chip is connected to the serial data transmit end TX of the microcontroller, and the TTL receive end R1OUT is connected to the serial data receive end RX of the microcontroller. The RS232 chip is connected to the industrial serial touch screen in the RS232 manner. The RS232 transmit output end TIOUT of the RS232 chip is connected to the serial receive end RX of the industrial serial touch screen, and the RS232 receive input end R1IN of the RS232 chip is connected to the serial transmit end TX of the industrial serial touch screen.

[0013] The beneficial effect of the present invention is that an environmental monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system can collect, display in real time, and upload the monitored data to the aluminum electrolysis multifunctional unit safety monitoring system for data recording and analysis the alumina dust, hydrogen fluoride, sulfur dioxide, carbon monoxide, etc. in the workplaces of aluminum electrolysis multifunctional unit operators and maintenance personnel. If the limit value is exceeded, an alarm will be issued to prompt the operators and maintenance personnel to take protection measures, thus preventing harmful dust and gases from causing personal injuries to employees. Brief Description of the Drawings

[0014] Figure 1 It is a system structure block diagram of an environmental monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system.

[0015] Figure 2 It is a schematic diagram of an environmental monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system.

[0016] Figure 3 It is a main program flow chart of an environmental monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system. Detailed Embodiments

[0017] The present invention is further described below in conjunction with the drawings and examples.

[0018] As Figure 1 shown, an environmental monitoring terminal of an aluminum electrolysis multifunctional unit safety monitoring system includes a power supply circuit 1, a microcontroller circuit 2, a dust detection circuit 3, a hydrogen fluoride detection circuit 4, a sulfur dioxide detection circuit 5, a carbon monoxide detection circuit 6, a CAN bus communication circuit 7, and an industrial serial touch screen circuit 8. Through the microcontroller, the concentration values of dust, hydrogen fluoride, sulfur dioxide, and carbon monoxide are monitored in real time, displayed in real time on the industrial serial touch screen circuit 8, and uploaded to the aluminum electrolysis multifunctional unit safety monitoring system through the CAN bus communication circuit 7 for alarm, prompting the operators and maintenance personnel to take protection measures to ensure the personal safety of the operators.

[0019] As Figure 2 shown, the power supply circuit 1 is composed of a varistor Rv1, an AC / DC module U1, a linear power supply chip U2, a first capacitor C1, a second capacitor C2, and a transient voltage suppression diode D1; the input AC power supply is an AC 220V power supply; the AC voltage phase line input terminal AC(L) of the AC / DC module U1 is connected to the AC power supply phase line AC220V(L), the AC voltage neutral line input terminal AC(N) is connected to the AC power supply neutral line AC220V(N), the DC voltage positive output terminal +Vo outputs a first power supply V1, and the DC voltage negative output terminal -Vo outputs a common ground GND; the varistor Rv1 is connected between the AC voltage phase line input terminal AC(L) and the AC voltage neutral line input terminal AC(N) of the AC / DC module U1 to play an overvoltage protection role; the first capacitor C1 is connected between the DC voltage positive output terminal +Vo and the DC voltage negative output terminal -Vo of the AC / DC module U1; the pin 1 of the transient voltage suppression diode D1 is connected to the DC voltage positive output terminal +Vo of the AC / DC module U1, and the pin 2 is connected to the DC voltage negative output terminal -Vo of the AC / DC module U1; the power supply input terminal VIN of the linear power supply chip U2 is connected to the DC voltage positive output terminal +Vo of the AC / DC module U1, the power supply ground terminal GND is connected to the DC voltage negative output terminal -Vo of the AC / DC module U1, and the power supply output terminal VOUT outputs a second power supply V2, which is connected to the common ground GND through the second capacitor C2.

[0020] The microcontroller circuit 2 is composed of a microcontroller U3; the power supply input terminal VDD of the microcontroller U3 is connected to the second power supply V2, and the power supply ground VSS of the microcontroller U3 is connected to the common ground GND.

[0021] The soot detection circuit 3 is composed of a soot detection sensor U4, a MOS transistor Q1, and a first resistor R1; the LED power supply input terminal V-LED and the power supply input terminal VCC of the soot detection sensor U4 are connected to the first power supply V1, the LED power supply ground LED-GND and the power supply ground GND are connected to the common ground GND, the LED drive terminal LEDDRV is connected to the drain of the MOS transistor Q1, and the soot concentration output terminal VO is connected to the first analog input terminal ADC1 of the microcontroller U3; the MOS transistor Q1 outputs a pulse signal to control the operation of the LED drive terminal LEDDRV of the soot detection sensor U4, and the gate of the MOS transistor Q1 is connected to the pulse width modulation output terminal PWM of the microcontroller U3 through the first resistor R1, and the source is connected to the common ground GND.

[0022] The hydrogen fluoride detection circuit 4 is composed of a first voltage reference chip U5, a first operational amplifier U6, a hydrogen fluoride sensor U7, a second operational amplifier U8, a temperature detection chip U9, a second resistor R2, a third resistor R3, and a third capacitor C3; the power input terminal VCC of the first voltage reference chip U5 is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the voltage reference output terminal VREF outputs a reference voltage; the first operational amplifier U6 provides the current required for the operation of the hydrogen fluoride sensor U7. The non-inverting input terminal IN+ of the first operational amplifier U6 is connected to the voltage reference output terminal VREF of the first voltage reference chip U5, the inverting input terminal IN- is connected to the reference electrode RE of the hydrogen fluoride sensor U7, and the output terminal OUT is connected to the counter electrode CE of the hydrogen fluoride sensor U7; the working electrode WE of the hydrogen fluoride sensor U7 is connected to the inverting input terminal IN- of the second operational amplifier U8 through the second resistor R2; the second operational amplifier U8 amplifies the output current signal of the hydrogen fluoride sensor U7. The second operational amplifier U8 is connected as an inverting proportional circuit. The inverting input terminal IN- of the second operational amplifier U8 is connected to the output terminal OUT of the second operational amplifier U8 through the third resistor R3, the non-inverting input terminal IN+ is connected to the voltage reference output terminal VREF of the first voltage reference chip U5, and the output terminal OUT is connected to the second analog input terminal ADC2 of the microcontroller U3. At the same time, the output terminal OUT is connected to the common ground GND through the third capacitor C3; the third capacitor C3 has a high-frequency filtering effect; the temperature detection chip U9 measures the ambient temperature and provides data for temperature compensation of the hydrogen fluoride sensor U7. The power input terminal VCC of the temperature detection chip U9 is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the temperature output terminal VOUT is connected to the third analog input terminal ADC3 of the microcontroller U3.

[0023] The sulfur dioxide detection circuit 5 is composed of a second voltage reference chip U10, a third operational amplifier U11, a sulfur dioxide sensor U12, a fourth operational amplifier U13, a fourth resistor R4, a fifth resistor R5, and a fourth capacitor C4. The power input terminal VCC of the second voltage reference chip U10 is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the voltage reference output terminal VREF outputs a reference voltage. The third operational amplifier U11 provides the current required for the operation of the sulfur dioxide sensor U12. The non-inverting input terminal IN+ of the third operational amplifier U11 is connected to the voltage reference output terminal VREF of the second voltage reference chip U10, the inverting input terminal IN- is connected to the reference electrode RE of the sulfur dioxide sensor U12, and the output terminal OUT is connected to the counter electrode CE of the sulfur dioxide sensor U12. The working electrode WE of the sulfur dioxide sensor U12 is connected to the inverting input terminal IN- of the fourth operational amplifier U13 through the fourth resistor R4. The fourth operational amplifier U13 amplifies the output current signal of the sulfur dioxide sensor U12. The fourth operational amplifier U13 is connected as an inverting proportional circuit. The inverting input terminal IN- of the fourth operational amplifier U13 is connected to the output terminal OUT of the fourth operational amplifier U13 through the fifth resistor R5, the non-inverting input terminal IN+ is connected to the voltage reference output terminal VREF of the second voltage reference chip U10, and the output terminal OUT is connected to the fourth analog input terminal ADC4 of the microcontroller U3. At the same time, the output terminal OUT is connected to the common ground GND through the fourth capacitor C4. The fourth capacitor C4 has a high-frequency filtering effect.

[0024] The carbon monoxide detection circuit 6 is composed of a carbon monoxide sensor U15, a fifth operational amplifier U14, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5. The carbon monoxide sensor U15 is an electrically heated gas-sensitive sensor. One port HEAT1 of the heating resistor of the carbon monoxide sensor U15 is connected to the first power supply V1, and the other port HEAT2 of the heating resistor is connected to the common ground GND through the eighth resistor R8. One port QM1 of the gas-sensitive detection is connected to the first power supply V1, and the other port QM2 of the gas-sensitive detection is connected to the non-inverting input terminal IN+ of the fifth operational amplifier U14 and is also connected to the common ground GND through the seventh resistor R7. The fifth operational amplifier U14 is connected as a voltage follower. The inverting input terminal IN- of the fifth operational amplifier U14 is connected to the output terminal OUT of the fifth operational amplifier U14, and the output terminal OUT is connected to the fifth analog input terminal ADC5 of the microcontroller U3 through the sixth resistor R6. At the same time, the output terminal OUT is connected to the common ground GND through the fifth capacitor C5. The fifth capacitor C5 has a high-frequency filtering effect.

[0025] The CAN bus communication circuit 7 is composed of a CAN transceiver chip U16 and communicates with the CAN bus of the security monitoring system. The power input terminal VCC of the CAN transceiver chip U16 is connected to the second power supply V2, the power ground GND is connected to the common ground GND, the CAN bus high-level terminal CANH is connected to the CANH of the security monitoring system CAN bus, the CAN bus low-level terminal CANL is connected to the CANL of the security monitoring system CAN bus, the sending end TXD is connected to the CAN bus sending end CANTX of the microcontroller U3, and the receiving end RXD is connected to the CAN bus receiving end CANRX of the microcontroller U3.

[0026] The industrial serial port touch screen circuit 8 is composed of an RS232 chip U17 and an industrial serial port touch screen U18. The RS232 chip U17 is connected to the microcontroller U3 in an RS232 manner. The TTL sending end T1IN of the RS232 chip U17 is connected to the serial port data sending end TX of the microcontroller U3, and the TTL receiving end R1OUT is connected to the serial port data receiving end RX of the microcontroller U3. The RS232 chip U17 is connected to the industrial serial port touch screen U18 in an RS232 manner. The RS232 sending output end TIOUT of the RS232 chip U17 is connected to the serial port receiving end RX of the industrial serial port touch screen U18, and the RS232 receiving input end R1IN of the RS232 chip U17 is connected to the serial port sending end TX of the industrial serial port touch screen U18.

[0027] As Figure 3 shown, it is the main program flow chart, and the specific working steps of the main process are as follows: Step 1, hardware initialization; Step 2, soot detection; Step 3, hydrogen fluoride detection; Step 4, sulfur dioxide detection; Step 5, carbon monoxide detection; Step 6, display data on the industrial serial port touch screen; Step 7, send data to the security monitoring system through the CAN bus; Step 8, go back to Step 2.

[0028] It should be noted that for the fully described present invention, there can also be various transformation and modification implementation schemes, which are not limited to the specific examples of the above implementation modes. The above examples are only used to illustrate the present invention, rather than to limit it. In short, the protection scope of the present invention includes those transformations, substitutions, and modifications that are obvious to those of ordinary skill in the art.

Claims

1. An environmental monitoring terminal of a safety monitoring system for an aluminum electrolysis multifunctional unit, comprising a power supply circuit, a microcontroller circuit, a soot detection circuit, a hydrogen fluoride detection circuit, a sulfur dioxide detection circuit, a carbon monoxide detection circuit, a CAN bus communication circuit, and an industrial serial touch screen circuit; characterized in that The power supply circuit consists of a varistor, an AC / DC module, a linear power supply chip, a first capacitor, a second capacitor, and a transient voltage suppression diode; the input AC power supply is an AC 220V power supply; the AC voltage phase input terminal AC(L) of the AC / DC module is connected to the AC power supply phase line AC220V(L), the AC voltage neutral input terminal AC(N) is connected to the AC power supply neutral line AC220V(N), the DC voltage positive output terminal +Vo outputs the first power supply V1, and the DC voltage negative output terminal -Vo outputs the common ground GND; The varistor is connected between the AC voltage phase input terminal AC(L) and the AC voltage neutral input terminal AC(N) of the AC / DC module to provide overvoltage protection; the first capacitor is connected between the DC voltage positive output terminal +Vo and the DC voltage negative output terminal -Vo of the AC / DC module; the pin 1 of the transient voltage suppression diode is connected to the DC voltage positive output terminal +Vo of the AC / DC module, and the pin 2 is connected to the DC voltage negative output terminal -Vo of the AC / DC module; The power input terminal VIN of the linear power supply chip is connected to the DC voltage positive output terminal +Vo of the AC / DC module, the power ground terminal GND is connected to the DC voltage negative output terminal -Vo of the AC / DC module, and the power output terminal VOUT outputs the second power supply V2, which is connected to the common ground GND through the second capacitor; The soot detection circuit consists of a soot detection sensor, a MOS transistor, and a first resistor; the LED power input terminal V-LED and the power input terminal VCC of the soot detection sensor are connected to the first power supply V1, the LED power ground LED-GND and the power ground GND are connected to the common ground GND, the LED drive terminal LEDDRV is connected to the drain of the MOS transistor, and the soot concentration output terminal VO is connected to the first analog input terminal ADC1 of the microcontroller; the MOS transistor outputs a pulse signal to control the operation of the LED drive terminal LEDDRV of the soot detection sensor, the gate of the MOS transistor is connected to the pulse width modulation output terminal PWM of the microcontroller through the first resistor, and the source is connected to the common ground GND; The hydrogen fluoride detection circuit consists of a first voltage reference chip, a first operational amplifier, a hydrogen fluoride sensor, a second operational amplifier, a temperature detection chip, a second resistor, a third resistor, and a third capacitor; The power input terminal VCC of the first voltage reference chip is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the voltage reference output terminal VREF outputs a reference voltage; The first operational amplifier provides the current required for the operation of the hydrogen fluoride sensor. The non-inverting input terminal IN+ of the first operational amplifier is connected to the voltage reference output terminal VREF of the first voltage reference chip, the inverting input terminal IN- is connected to the reference electrode RE of the hydrogen fluoride sensor, and the output terminal OUT is connected to the counter electrode CE of the hydrogen fluoride sensor. The working electrode WE of the hydrogen fluoride sensor is connected to the inverting input terminal IN- of the second operational amplifier through the second resistor. The second operational amplifier amplifies the output current signal of the hydrogen fluoride sensor. The second operational amplifier is connected as an inverting proportional circuit. The inverting input terminal IN- of the second operational amplifier is connected to the output terminal OUT of the second operational amplifier through the third resistor, the non-inverting input terminal IN+ is connected to the voltage reference output terminal VREF of the first voltage reference chip, and the output terminal OUT is connected to the second analog input terminal ADC2 of the microcontroller. At the same time, the output terminal OUT is connected to the common ground GND through the third capacitor. The third capacitor has a high-frequency filtering effect. The temperature detection chip measures the ambient temperature and provides the data for temperature compensation of the hydrogen fluoride sensor. The power input terminal VCC of the temperature detection chip is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the temperature output terminal VOUT is connected to the third analog input terminal ADC3 of the microcontroller; The sulfur dioxide detection circuit consists of a second voltage reference chip, a third operational amplifier, a sulfur dioxide sensor, a fourth operational amplifier, a fourth resistor, a fifth resistor, and a fourth capacitor; The power input terminal VCC of the second voltage reference chip is connected to the first power supply V1, the power ground GND is connected to the common ground GND, and the voltage reference output terminal VREF outputs a reference voltage; The third operational amplifier provides the current required for the operation of the sulfur dioxide sensor. The non-inverting input terminal IN+ of the third operational amplifier is connected to the voltage reference output terminal VREF of the second voltage reference chip, the inverting input terminal IN- is connected to the reference electrode RE of the sulfur dioxide sensor, and the output terminal OUT is connected to the counter electrode CE of the sulfur dioxide sensor. The working electrode WE of the sulfur dioxide sensor is connected to the inverting input terminal IN- of the fourth operational amplifier through the fourth resistor. The fourth operational amplifier amplifies the output current signal of the sulfur dioxide sensor. The fourth operational amplifier is connected as an inverting proportional circuit. The inverting input terminal IN- of the fourth operational amplifier is connected to the output terminal OUT of the fourth operational amplifier through the fifth resistor, the non-inverting input terminal IN+ is connected to the voltage reference output terminal VREF of the second voltage reference chip, and the output terminal OUT is connected to the fourth analog input terminal ADC4 of the microcontroller. At the same time, the output terminal OUT is connected to the common ground GND through the fourth capacitor. The fourth capacitor has a high-frequency filtering effect; The carbon monoxide detection circuit consists of a carbon monoxide sensor, a fifth operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, and a fifth capacitor; the carbon monoxide sensor is an electrically heated gas sensor. One port HEAT1 of the heating resistor of the carbon monoxide sensor is connected to the first power supply V1, and the second port HEAT2 of the heating resistor is connected to the common ground GND through the eighth resistor. One port QM1 of the gas-sensitive detection is connected to the first power supply V1, and the second port QM2 of the gas-sensitive detection is connected to the non-inverting input terminal IN+ of the fifth operational amplifier and is also connected to the common ground GND through the seventh resistor; the fifth operational amplifier is connected as a voltage follower. The inverting input terminal IN- of the fifth operational amplifier is connected to the output terminal OUT of the fifth operational amplifier. The output terminal OUT is connected to the fifth analog input terminal ADC5 of the microcontroller through the sixth resistor, and at the same time, the output terminal OUT is connected to the common ground GND through the fifth capacitor; the fifth capacitor has a high-frequency filtering effect. The CAN bus communication circuit consists of a CAN transceiver chip and communicates with the CAN bus of the safety monitoring system; the power input terminal VCC of the CAN transceiver chip is connected to the second power supply V2, the power ground GND is connected to the common ground GND, the CAN bus high-level terminal CANH is connected to the CANH of the CAN bus of the safety monitoring system, the CAN bus low-level terminal CANL is connected to the CANL of the CAN bus of the safety monitoring system, the transmitting terminal TXD is connected to the CAN bus transmitting terminal CANTX of the microcontroller, and the receiving terminal RXD is connected to the CAN bus receiving terminal CANRX of the microcontroller. The industrial serial port touch screen circuit consists of an RS232 chip and an industrial serial port touch screen; the RS232 chip is connected to the microcontroller in an RS232 manner; the TTL transmitting terminal T1IN of the RS232 chip is connected to the serial data transmitting terminal TX of the microcontroller, and the TTL receiving terminal R1OUT is connected to the serial data receiving terminal RX of the microcontroller; the RS232 chip is connected to the industrial serial port touch screen in an RS232 manner; the RS232 transmitting output terminal TIOUT of the RS232 chip is connected to the serial receiving terminal RX of the industrial serial port touch screen, and the RS232 receiving input terminal R1IN of the RS232 chip is connected to the serial transmitting terminal TX of the industrial serial port touch screen.

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