Novel coal mine ventilation safety linkage quick response circuit

Abstract

The utility model discloses a novel coal mine ventilation safety linkage quick response circuit, and relates to the field of coal mines. The ultrasonic wind speed and direction sensor detects the wind speed and the wind direction in a mine in real time, generates two paths of measurement signals and sends the measurement signals to the operational amplifier module, and the measurement signals are amplified. The ultra-wideband positioning module is used for positioning underground personnel; the microcontroller module is used for determining whether the position of a person is abnormal or not according to the positioning data sent by the ultra-wideband positioning module, judging whether the wind speed exceeds an alarm threshold value or not according to the amplified measurement signal, and outputting a first control signal to the multi-stage alarm module when detecting that the wind speed exceeds the alarm threshold value or the position of the person is abnormal; outputting a second control signal to a direct current motor to drive an air door module; the direct-current motor driving air door module drives a direct-current motor according to a second control signal sent by the microcontroller module so as to open or close an air door; the multi-stage alarm module gives an alarm according to the first control signal sent by the microcontroller module.

Description

Technical Field

[0001] This utility model belongs to the field of coal mining, and in particular relates to a novel fast-response circuit for coal mine ventilation safety linkage. Background Technology

[0002] In special working environments such as mines, wind speed is a core parameter of the ventilation system, directly determining underground air quality, disaster prevention and control capabilities, and working conditions. Personnel safety positioning is a core technology for achieving "precise management, rapid rescue, and risk pre-control." Therefore, wind speed monitoring and personnel safety positioning are important technical means to ensure the safety of underground operations.

[0003] Traditional wind speed detection methods primarily employ mechanical or ordinary electronic anemometers, which suffer from slow response times and difficult maintenance, hindering real-time and accurate monitoring. Furthermore, the complex underground environment makes it difficult to track personnel movements, increasing the risk of accidental entry into hazardous areas or ventilation failures. Existing personnel positioning methods in mines include RFID, Wi-Fi, and Bluetooth, but these technologies have weak anti-interference capabilities and their effectiveness is limited in complex mine environments, failing to meet the high accuracy requirements for personnel positioning. Therefore, ensuring safe underground operations necessitates simultaneously monitoring wind speed and locating personnel, thus creating an urgent need for a circuit capable of concurrently performing these two functions. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a novel fast-response circuit for coal mine ventilation safety linkage. It employs an ultrasonic wind speed sensor to acquire wind speed and direction information in real time, offering advantages such as high precision, no mechanical wear, and rapid response. Simultaneously, it introduces UWB (Ultra-Wideband) positioning technology to achieve high-precision real-time positioning of underground personnel, thereby ensuring the safety of underground operations.

[0005] A novel fast-response circuit for safety linkage in coal mine ventilation includes a power supply module, an ultrasonic wind speed and direction sensor, an operational amplifier module, an ultra-wideband positioning module, a microcontroller module, a DC motor-driven damper module, and a multi-level alarm module.

[0006] The input terminal of the power module is connected to an external power supply. After voltage conversion, the output terminal is connected to the microcontroller module, operational amplifier module, ultrasonic wind speed and direction sensor and ultra-wideband positioning module for power supply.

[0007] The ultrasonic wind speed and direction sensor is used to detect wind speed and direction in the mine in real time, generate two measurement signals and send them to the operational amplifier module.

[0008] The operational amplifier module is used to amplify the measurement signal sent by the ultrasonic anemometer and wind direction sensor, and input the amplified measurement signal to the microcontroller module.

[0009] The ultra-wideband positioning module is used to locate personnel underground and transmit the positioning data to the microcontroller module;

[0010] The microcontroller module determines whether there is an abnormal personnel position based on the positioning data sent by the ultra-wideband positioning module, and at the same time determines whether the wind speed exceeds the alarm threshold based on the amplified measurement signal. When the wind speed exceeds the alarm threshold or the personnel position is abnormal, it outputs a first control signal to the multi-level alarm module and a second control signal to the DC motor drive damper module.

[0011] The DC motor driven damper module is used to drive the DC motor according to the second control signal sent by the microcontroller module, thereby realizing the opening or closing action of the damper.

[0012] The multi-level alarm module is used to trigger an alarm based on the first control signal sent by the microcontroller module.

[0013] Furthermore, the power supply module includes a DC power supply terminal block, a switch SW2, a low-dropout linear regulator HT7833, a first capacitor C10, and a second capacitor C2. Pins 2 and 3 of the DC power supply terminal block are grounded. One end of pin 1 is connected to a +5V external power supply, and the other end is connected to pin 3 of the switch. Pin 1 of the switch is left floating. Pin 2 is connected to pin 2 of the low-dropout linear regulator and is grounded through the first capacitor C10. Pin 1 of the low-dropout linear regulator is grounded. Pin 3 outputs a +3.3V voltage to power the microcontroller module, operational amplifier module, ultrasonic anemometer, and ultra-wideband positioning module. Pin 3 is also grounded through the second capacitor C2.

[0014] Furthermore, the ultrasonic wind speed and direction sensor is a WS-30 model ultrasonic wind speed and direction sensor. The two measurement signals acquired are connected to the operational amplifier module in differential form through the A- and A+ pins and the B- and B+ pins, respectively. The VCC pin of the ultrasonic wind speed and direction sensor is connected to the +3.3V voltage output of the power supply module, and the GND pin is grounded.

[0015] Furthermore, the operational amplifier module includes a first operational amplifier U17, a second operational amplifier U18, a first resistor R4, and a second resistor R5. Both the first operational amplifier U17 and the second operational amplifier U18 are operational amplifiers of model INA333AIDGKR. Pins 2 and 3 of the first operational amplifier U17 are connected to the A- and A+ pins of the ultrasonic anemometer, respectively, to receive one measurement signal. Pins 2 and 3 of the second operational amplifier U18 are connected to the B- and B+ pins of the ultrasonic anemometer, respectively, to receive another measurement signal. A first resistor R4 and a second resistor R5 are respectively installed between pins 1 and 8 of the first operational amplifier U17 and the second operational amplifier U18. Pin 7 of both operational amplifiers is connected to the +3.3V voltage output of the power supply module, and pins 4 and 5 are grounded. The amplified measurement signals from the two operational amplifiers U17 and U18 are input to the microcontroller module via pin 6.

[0016] Furthermore, the ultra-wideband positioning module is model DWM1000, with its VDD pin connected to the +3.3V voltage output of the power supply module, its GND pin grounded, and its clock pin SCK, communication pins MOSI and MISO, chip select pin CSn, interrupt pin IRQ, and hardware reset RSTn all connected to the microcontroller module.

[0017] Furthermore, the microcontroller module is an STM32 microcontroller, with pins 24, 36, and 48 connected to the +3.3V voltage output of the power supply module, and pins 23, 35, and 47 grounded. The amplified measurement signals output by the first operational amplifier U17 and the second operational amplifier U18 are respectively input to pins 10 and 11 of the STM32 microcontroller. Pins 14 to 19 of the STM32 microcontroller are respectively connected to the chip select terminal CSn, clock pin SCK, communication pins MOSI and MISO, interrupt pin IRQ, and hardware reset RSTn of the ultra-wideband positioning module. Pin 27 is directly connected to the multi-level alarm module, and pin 28 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the multi-level alarm module. Pins 25, 26, and 43 are connected to the DC motor drive damper module.

[0018] Furthermore, the DC motor drive damper module includes an L298N dual full-bridge driver chip and a DC motor JGA25-370. Pin 4 of the L298N dual full-bridge driver chip is connected to a +12V voltage, pin 9 is connected to a +5V voltage, and pin 8 is grounded. Pin 43 of the microcontroller module inputs an enable signal to pin 6 of the L298N dual full-bridge driver chip. The second control signal generated by the microcontroller module is input through pins 5 and 7, and outputs a logic level state to both ends of the DC motor JGA25-370 through pins 2 and 3, namely pins 3 and 4 of the DC motor JGA25-370. Pin 2 of the DC motor JGA25-370 is connected to a +5V voltage, and pin 1 is grounded.

[0019] Furthermore, the multi-level alarm module includes an active buzzer and an LED light. Pin 1 of the active buzzer is connected to a +5V voltage, pin 3 is grounded, and pin 2 is connected to a third resistor R3 and then to pin 28 of the microcontroller module. The positive terminal of the LED light is connected to pin 27 of the microcontroller module, and the negative terminal is grounded after passing through a resistor.

[0020] The beneficial effects of adopting the above technical solution are as follows:

[0021] 1. This utility model adopts ultrasonic wind speed sensor technology, which is based on the time difference principle of ultrasonic propagation. It has no mechanical rotating parts, supports 360° omnidirectional measurement of wind speed and direction, and has a built-in temperature compensation algorithm. Its omnidirectional measurement capability can capture complex airflow in the roadway (such as local eddies), solving the problem that unidirectional measuring instruments cannot reflect airflow turbulence. At the same time, its built-in temperature compensation algorithm eliminates the influence of high and low temperature environment in the mine on measurement accuracy, providing a high-precision basis for air volume control.

[0022] 2. This invention also employs UWB personnel positioning technology, which uses ultra-wideband pulse signals (nanosecond-level short pulses) and achieves positioning through Time-of-Flight (ToF) and Time Difference of Arrival (TDOA) algorithms. It eliminates the need for strict clock synchronization and boasts strong signal penetration. This technology overcomes the stringent clock synchronization requirements of traditional positioning methods. Furthermore, the ultra-wideband signal can penetrate obstacles such as metal equipment and rock strata within mines, maintaining stable communication even in complex tunnel environments. This solves the positioning interruption problem caused by signal obstruction in technologies like RFID and Wi-Fi, ensuring continuous collection of personnel location data. In mine environments with high electromagnetic interference, positioning data will not jump or become distorted, resolving the "position drift" problem caused by signal interference in Wi-Fi and ZigBee. This ensures the accuracy and reliability of personnel location information obtained by the ground monitoring center, providing accurate data for emergency decision-making. Simultaneously, UWB personnel positioning technology features high accuracy and fast response, significantly reducing risk intervention time.

[0023] 3. The ultrasonic anemometer also supports RS485 / Modbus protocols, enabling seamless integration with UWB positioning and mine ventilation control platforms. This allows for data linkage and real-time fusion of wind speed and personnel location data, building an "environment-personnel" coordinated control model. When the wind speed in a certain area falls below the safe threshold, the system can automatically locate personnel in that area and issue evacuation alerts. This shortens response time compared to the traditional process of "first detecting abnormal wind speed, then manually checking personnel," thus improving proactive disaster prevention. Attached Figure Description

[0024] Figure 1 This is a circuit diagram of a novel coal mine ventilation safety linkage rapid response circuit in a specific implementation. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] This embodiment provides a novel fast-response circuit for coal mine ventilation safety linkage, such as... Figure 1 As shown, it includes a power supply module, an ultrasonic wind speed and direction sensor, an operational amplifier module, an ultra-wideband (UWB) positioning module, a microcontroller module, a DC motor driven damper module, and a multi-level alarm module;

[0027] The input terminal of the power module is connected to an external power supply. After voltage conversion, the output terminal is connected to a microcontroller module, an operational amplifier module, an ultrasonic wind speed and direction sensor, and an ultra-wideband (UWB) positioning module for power supply. The overall power supply design ensures long-term reliable operation and low power consumption, making it suitable for places with unstable power grids such as mines.

[0028] The ultrasonic wind speed and direction sensor is used to detect wind speed and direction in the mine in real time, generate two measurement signals and send them to the operational amplifier module.

[0029] The operational amplifier module is used to amplify the measurement signal sent by the ultrasonic anemometer and wind direction sensor, and input the amplified measurement signal to the microcontroller module.

[0030] The ultra-wideband (UWB) positioning module is used to locate personnel underground and transmit the positioning data to the microcontroller module;

[0031] The microcontroller module determines whether there is an abnormal personnel position based on the positioning data sent by the ultra-wideband (UWB) positioning module, and at the same time determines whether the wind speed exceeds the alarm threshold based on the amplified measurement signal. When the wind speed exceeds the alarm threshold or the personnel position is abnormal, the microcontroller module outputs a first control signal to the multi-level alarm module and outputs a second control signal to the DC motor drive damper module.

[0032] The DC motor drive damper module is used to drive the DC motor (forward or reverse rotation) according to the second control signal sent by the microcontroller module, thereby realizing the opening or closing action of the damper;

[0033] The multi-level alarm module is used to trigger an alarm based on the first control signal sent by the microcontroller module.

[0034] The power module serves as the physical interface for external DC power supply to the system, including a DC power supply terminal block, a switch SW2, a low-dropout linear regulator HT7833 (LDO), a first capacitor C10, and a second capacitor C2. Pins 2 and 3 of the DC power supply terminal block are grounded. One end of pin 1 is connected to a +5V external power supply, and the other end is connected to pin 3 of the switch. Pin 1 of the switch is left floating. Pin 2 is connected to pin 2 of the low-dropout linear regulator and grounded via the first capacitor C10. Pin 1 of the low-dropout linear regulator is grounded. Pin 3 outputs a +3.3V voltage to power the microcontroller module, operational amplifier module, ultrasonic anemometer, and ultra-wideband (UWB) positioning module. Pin 3 is also grounded via the second capacitor C2.

[0035] One-button on / off control is achieved through switch SW2, and a +3.3V clean power supply is output through the low dropout linear regulator HT7833. The first capacitor C10 and the second capacitor C2 play a filtering role, removing ripple and high-frequency interference in the power supply, improving power quality, and ensuring stable operation of each module.

[0036] The ultrasonic wind speed and direction sensor is a Winsen Technology WS-30 model ultrasonic wind speed and direction sensor. The two measurement signals acquired are connected to the operational amplifier module in differential form through the A- and A+ pins and the B- and B+ pins, respectively. The VCC pin of the ultrasonic wind speed and direction sensor is connected to the +3.3V voltage output of the power supply module, and the GND pin is grounded.

[0037] The operational amplifier module includes a first operational amplifier U17, a second operational amplifier U18, a first resistor R4, and a second resistor R5. Both the first operational amplifier U17 and the second operational amplifier U18 are INA333AIDGKR operational amplifiers. Pins 2 and 3 of the first operational amplifier U17 are connected to the A- and A+ pins of the ultrasonic anemometer, respectively, to receive one measurement signal. Pins 2 and 3 of the second operational amplifier U18 are connected to the B- and B+ pins of the ultrasonic anemometer, respectively, to receive another measurement signal. A first resistor R4 and a second resistor R5 are respectively placed between pins 1 and 8 of the first operational amplifier U17 and the second operational amplifier U18. Pin 7 of both operational amplifiers is connected to the +3.3V voltage output of the power supply module, and pins 4 and 5 are grounded. The amplified measurement signals from both operational amplifiers U17 and U18 are input to the microcontroller module via pin 6. The first resistor R4 and the second resistor R5 are used to set the gain of the operational amplifiers.

[0038] The ultra-wideband (UWB) positioning module is model DWM1000. Its VDD pin is connected to the +3.3V voltage output of the power supply module, the GND pin is grounded, and the clock pin SCK, communication pins MOSI and MISO, chip select pin CSn, interrupt pin IRQ and hardware reset RSTn are all connected to the microcontroller module.

[0039] The microcontroller module includes an STM32 microcontroller and a third resistor R3. Pins 24, 36, and 48 are connected to the +3.3V voltage output of the power supply module, while pins 23, 35, and 47 are grounded. The amplified measurement signals output from the first operational amplifier U17 and the second operational amplifier U18 are input to pins 10 and 11 of the STM32 microcontroller, respectively. Pins 14 to 19 of the STM32 microcontroller are connected to the chip select terminal CSn, clock pin SCK, communication pins MOSI and MISO, interrupt pin IRQ, and hardware reset RSTn of the ultra-wideband (UWB) positioning module, respectively. Pin 27 is directly connected to the multi-level alarm module, and pin 28 is connected to one end of the third resistor R3, which in turn connects to the multi-level alarm module. Pins 25, 26, and 43 are connected to the DC motor drive damper module.

[0040] The DC motor driven damper module includes an L298N dual full-bridge driver chip and a DC motor JGA25-370. Pin 4 of the L298N dual full-bridge driver chip is connected to +12V, pin 9 is connected to +5V, and pin 8 is grounded. Pin 43 of the microcontroller module inputs an enable signal to pin 6 of the L298N dual full-bridge driver chip. The second control signal generated by the microcontroller module is input through pins 5 and 7 (OUT 1, OUT 2) and outputs a logic level state to the two ends of the DC motor JGA25-370 through pins 2 and 3, namely pins 3 and 4 of the DC motor JGA25-370. Pin 2 of the DC motor JGA25-370 is connected to +5V, and pin 1 is grounded.

[0041] The multi-level alarm module includes an active buzzer and an LED light. Pin 1 of the active buzzer is connected to a +5V voltage, pin 3 is grounded, and pin 2 is connected to a third resistor R3 and then to pin 28 of the microcontroller module. The positive terminal of the LED light is connected to pin 27 of the microcontroller module, and the negative terminal is grounded after passing through a resistor.

[0042] The following describes a single use of this utility model with reference to the accompanying drawings:

[0043] Connect the external power supply to the DC power supply terminal block, and toggle the switch to connect the +5V voltage to the low-dropout linear regulator HT7833, which then steps it down to 3.3V. The ultrasonic wind speed and direction sensor outputs four differential signals (A+, A-, B+, B-), which are amplified by operational amplifier modules (U17, U18) and then sent to the STM32's ADC interface to complete the analog-to-digital signal sampling for real-time wind speed and direction data detection. The UWB positioning module communicates with the STM32 using the SPI communication protocol (MOSI and MISO) to transmit the positioning data of personnel underground. The STM32 uses the positioning data to determine whether personnel are close to dangerous areas or airlocks, and then takes appropriate safety measures. The buzzer is controlled via GPIO. When the wind speed exceeds the alarm threshold or the personnel's position is abnormal, the STM32 can control the buzzer to sound an alarm and simultaneously control the LED to light up to alert the on-site personnel. The DC motor-driven damper module uses the L298N dual full-bridge driver chip. The STM32 microcontroller sends an enable signal through port PB7 to drive the 12V L298N dual full-bridge driver chip. The logic level output from pins 2 and 3 controls the DC motor to open or close the damper, thus achieving wind speed-linked damper adjustment. The entire system intelligently judges based on collected wind speed, wind direction, and personnel positioning data, and sets up a multi-level alarm mechanism. Under different safety levels, it activates buzzers, LED warnings, or damper control to ensure mine ventilation safety and personnel safety.

[0044] The system activates buzzers, LED warnings, or damper control under different safety levels, specifically including early warning, intervention, and emergency levels. When the wind speed slightly deviates from the safe range and personnel approach the boundary of the danger zone, an early warning alarm is triggered, the LED light remains on, and the STM32 uploads abnormal data (time, location, wind speed value) to the ground monitoring platform. The system automatically marks it as an "event requiring attention," without immediate shutdown. When the wind speed is significantly abnormal and personnel briefly enter the danger zone, an intervention alarm is triggered, the LED light flashes, the buzzer sounds 1-2 times per second, and the STM32 controls the DC motor to rotate and open the damper. When the wind speed severely exceeds the limit and personnel remain in the danger zone, an emergency alarm is triggered, the LED light flashes at high frequency, the buzzer sounds at high frequency, the STM32 automatically cuts off power to non-essential equipment in the danger zone, and controls the DC motor to rotate at high speed to open the damper, increasing ventilation. This layered control achieves high-efficiency operation.

[0045] Finally, it should be noted that the solutions in the embodiments are not intended to limit the scope of patent protection of this utility model. All equivalent implementations or modifications that do not depart from the scope of this utility model are included in the patent scope of this case.

Claims

1. A novel fast-response circuit for coal mine ventilation safety linkage, characterized in that, It includes a power supply module, an ultrasonic wind speed and direction sensor, an operational amplifier module, an ultra-wideband positioning module, a microcontroller module, a DC motor drive damper module, and a multi-level alarm module; The input terminal of the power module is connected to an external power supply. After voltage conversion, the output terminal is connected to the microcontroller module, operational amplifier module, ultrasonic wind speed and direction sensor and ultra-wideband positioning module for power supply. The ultrasonic wind speed and direction sensor is used to detect wind speed and direction in the mine in real time, generate two measurement signals and send them to the operational amplifier module. The operational amplifier module is used to amplify the measurement signal sent by the ultrasonic anemometer and wind direction sensor, and input the amplified measurement signal to the microcontroller module. The ultra-wideband positioning module is used to locate personnel underground and transmit the positioning data to the microcontroller module; The microcontroller module determines whether there is an abnormal personnel position based on the positioning data sent by the ultra-wideband positioning module, and at the same time determines whether the wind speed exceeds the alarm threshold based on the amplified measurement signal. When the wind speed exceeds the alarm threshold or the personnel position is abnormal, it outputs a first control signal to the multi-level alarm module and a second control signal to the DC motor drive damper module. The DC motor driven damper module is used to drive the DC motor according to the second control signal sent by the microcontroller module, thereby realizing the opening or closing action of the damper. The multi-level alarm module is used to trigger an alarm based on the first control signal sent by the microcontroller module.

2. The novel coal mine ventilation safety linkage rapid response circuit according to claim 1, characterized in that, The power supply module includes a DC power supply terminal block, a switch SW2, a low-dropout linear regulator HT7833, a first capacitor C10, and a second capacitor C2. Pins 2 and 3 of the DC power supply terminal block are grounded. One end of pin 1 is connected to a +5V external power supply, and the other end is connected to pin 3 of the switch. Pin 1 of the switch is left floating. Pin 2 is connected to pin 2 of the low-dropout linear regulator and is grounded via the first capacitor C10. Pin 1 of the low-dropout linear regulator is grounded. Pin 3 outputs a +3.3V voltage to power the microcontroller module, operational amplifier module, ultrasonic anemometer, and ultra-wideband positioning module. Pin 3 is also grounded via the second capacitor C2.

3. The novel coal mine ventilation safety linkage rapid response circuit according to claim 1, characterized in that, The ultrasonic wind speed and direction sensor is a WS-30 model ultrasonic wind speed and direction sensor. The two measurement signals acquired are connected to the operational amplifier module in differential form through the A- and A+ pins and the B- and B+ pins, respectively. The VCC pin of the ultrasonic wind speed and direction sensor is connected to the +3.3V voltage output of the power supply module, and the GND pin is grounded.

4. The novel coal mine ventilation safety linkage fast response circuit according to claim 1, characterized in that, The operational amplifier module includes a first operational amplifier U17, a second operational amplifier U18, a first resistor R4, and a second resistor R5. Both the first operational amplifier U17 and the second operational amplifier U18 are INA333AIDGKR operational amplifiers. Pins 2 and 3 of the first operational amplifier U17 are connected to the A- and A+ pins of the ultrasonic anemometer, respectively, to receive one measurement signal. Pins 2 and 3 of the second operational amplifier U18 are connected to the B- and B+ pins of the ultrasonic anemometer, respectively, to receive another measurement signal. A first resistor R4 and a second resistor R5 are respectively placed between pins 1 and 8 of the first operational amplifier U17 and the second operational amplifier U18. Pin 7 of both operational amplifiers is connected to the +3.3V voltage output of the power supply module, and pins 4 and 5 are grounded. The amplified measurement signals from both operational amplifiers U17 and U18 are input to the microcontroller module via pin 6.

5. A novel fast-response circuit for coal mine ventilation safety linkage according to claim 1, characterized in that, The ultra-wideband positioning module is model DWM1000. Its VDD pin is connected to the +3.3V voltage output of the power supply module, the GND pin is grounded, and the clock pin SCK, communication pins MOSI and MISO, chip select pin CSn, interrupt pin IRQ and hardware reset RSTn are all connected to the microcontroller module.

6. A novel fast-response circuit for coal mine ventilation safety linkage according to claim 1, characterized in that, The microcontroller module is an STM32 microcontroller. Pins 24, 36, and 48 are connected to the +3.3V voltage output of the power supply module, and pins 23, 35, and 47 are grounded. The amplified measurement signals output by the first operational amplifier U17 and the second operational amplifier U18 are respectively input to pins 10 and 11 of the STM32 microcontroller. Pins 14 to 19 of the STM32 microcontroller are respectively connected to the chip select terminal CSn, clock pin SCK, communication pins MOSI and MISO, interrupt pin IRQ, and hardware reset RSTn of the ultra-wideband positioning module. Pin 27 is directly connected to the multi-level alarm module, and pin 28 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the multi-level alarm module. Pins 25, 26, and 43 are connected to the DC motor drive damper module.

7. A novel fast-response circuit for coal mine ventilation safety linkage according to claim 1, characterized in that, The DC motor driven damper module includes an L298N dual full-bridge driver chip and a DC motor JGA25-370. Pin 4 of the L298N dual full-bridge driver chip is connected to +12V, pin 9 is connected to +5V, and pin 8 is grounded. Pin 43 of the microcontroller module inputs an enable signal to pin 6 of the L298N dual full-bridge driver chip. The second control signal generated by the microcontroller module is input through pins 5 and 7, and outputs a logic level state to the two ends of the DC motor JGA25-370 through pins 2 and 3, namely pins 3 and 4 of the DC motor JGA25-370. Pin 2 of the DC motor JGA25-370 is connected to +5V, and pin 1 is grounded.

8. A novel fast-response circuit for coal mine ventilation safety linkage according to claim 1, characterized in that, The multi-level alarm module includes an active buzzer and an LED light. Pin 1 of the active buzzer is connected to a +5V voltage, pin 3 is grounded, and pin 2 is connected to a third resistor R3 and then to pin 28 of the microcontroller module. The positive terminal of the LED light is connected to pin 27 of the microcontroller module, and the negative terminal is grounded after passing through a resistor.

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