Coal Mine Automatic Fire Alarm and Extinguishing Control Device

Based on Standards

According to DB14/T 2060-2020 "Intelligent Coal Mine Construction Specification" and NB/T 10048-2018 "Safety Operation Specification for In-use Drum Driven Belt Conveyors in Coal Mines", automatic fire prevention and extinguishing devices need to be installed in belt transport roadways and electromechanical chambers.

System Overview

The ZSM127 coal mine automatic fire alarm and extinguishing device mainly detects parameters such as temperature, carbon monoxide concentration, flame, and smoke to intelligently determine whether a fire has occurred; once a fire occurs, the device will automatically activate water spray or dry powder extinguishing and issue a voice alarm.

System Purpose

Suitable for fire prevention and extinguishing use in underground coal mine belt transport roadways, electromechanical chambers, coal bunker electromechanical equipment centralized use areas, and other locations.

System Composition

The control device mainly consists of the ZP127-Z mine explosion-proof and intrinsically safe automatic water spray dust suppression main control box, mine carbon monoxide sensor, mine temperature sensor, mine intrinsically safe smoke sensor, mine intrinsically safe flame sensor, mine intrinsically safe voice and light alarm, mine explosion-proof electric ball valve, mine explosion-proof and intrinsically safe DC stabilized power supply, etc.

Associated Component Technical Parameters

Mine Explosion-proof and Intrinsically Safe Automatic Water Spray Dust Suppression Main Control Box

1) Operating Voltage: AC127V;

2) Device Control Execution Time: ≤4s;

3) Rated Operating Current: ≤200 mA;

4) When the input is ≥3.0V DC high-level signal, it should be able to change the control state of the main control box; when the input is ≤0.5V DC low-level signal, it should return to the initial state after a delay. High and low-level signal input terminals: 4 channels.

5) Functions:

a. The main control box has remote calibration function, allowing parameter setting and work mode selection within a remote control distance of 3m and remote control angle of 0~3.0°.

b. The main control box has parameter storage function.

c. The main control box has display function, which can display input signal status and parameter setting information through the LCD screen.

d. The main control box has fiber optic communication function with the host computer; the host computer can display the current working status of the main control box and control the spray status.

6) Explosion-proof type: Mine explosion-proof and intrinsically safe type, explosion-proof mark: Ex db [ib Mb]I Mb.

Mine Intrinsically Safe Voice and Light Alarm

1. Rated Operating Voltage: DC18V;

2. Operating Current: ≤600mA;

3. Communication Signal: RS485;

4. Voice File Storage: 30 files;

5. Main Functions

a. Has the function to play stored voice files;

b. Has voice and light alarm function, with alarm light signals clearly visible at 20m distance in dark environments.

6. Explosion-proof type: Mine intrinsically safe type, explosion-proof mark: Ex ib I Mb.

Mine Carbon Monoxide Sensor

1. Operating Voltage: 18VDC;

2. Operating Current: ≤200mA;

3. RS485 Output Signal

a. Number of channels: 1 channel;

b. Baud rate: 2400bps;

4. Measurement Range and Resolution

a. Measurement Range: (0~1000)×10⁻⁶ CO;

b. Resolution: 1×10⁻⁶ CO.

5. Explosion-proof type: Mine intrinsically safe type, explosion-proof mark: Ex ib I Mb.

Mine Intrinsically Safe Smoke Sensor

1. Rated Operating Voltage: DC18V;

2. Operating Voltage Range: DC9V~DC24V;

3. Maximum Operating Current: ≤200mA;

4. Sensitivity and Response Time

When smoke concentration reaches 5% obs/m, the sensor should activate, and the response time should not exceed 20s.

5. Operating Performance

When smoke concentration ≥ 5% obs/m, the red LED light stays on, the buzzer alarms, the relay activates, and RS485 outputs an alarm signal;

When smoke concentration < 5% obs/m, the red LED light turns off, the buzzer stops, the relay resets, and RS485 outputs a normal signal.

6. Sensor output signal

a. RS485 signal;

b. Passive node signal;

7. Explosion-proof type: Mine intrinsic safety type, explosion-proof mark: Ex ib I Mb.

Mine intrinsic safety flame sensor (purchased product)

1) Operating voltage: DC (12~16) V;

2) Operating current: 16-40mA;

3) Output signal: No fire alarm signal: high impedance state, high level ≥ 13V; fire alarm signal: low level ≤ 3V.

Mine explosion-proof electric ball valve (purchased product)

1) Power supply: AC127V;

2) Average power consumption during ball valve rotation: no more than 10W (static power consumption less than 0.1W);

3) Nominal diameter of electric ball valve: 20mm;

4) Water pressure adaptation range of electric ball valve: 0.2-10MPa;

Mine explosion-proof and intrinsic safety type DC regulated power supply

1) Rated operating voltage: AC127V/220V/380V/660V;

2) Input apparent power: ≤150VA;

3) Power supply fluctuation range: 75%~110%;

4) Output voltage: 1 channel 12V; 1 channel 18V.

5) Main functions

a. When AC power is off, the backup battery immediately automatically starts working.

b. The power supply has overcurrent, overvoltage, and short circuit protection functions. When a fault occurs, the power supply automatically protects itself and automatically resumes normal operation after the fault is cleared.

c. The power supply has AC/DC working status indication functions.

6) Explosion-proof type: Mine explosion-proof and intrinsically safe type, explosion-proof mark: Ex db [ib Mb]I Mb.

System features

(1) Strong adaptability

Can capture the occurrence of risks from multiple fire characteristics (red ultraviolet flame, smoke, carbon monoxide, temperature, etc.) and make timely judgments.

(2) Flexible parameter settings

Parameters can be set inside the main control box via remote control, and all sensor values used to judge risks can be set independently.

Main technical parameters

(1) Rated operating voltage: AC127V

(2) Explosion-proof type: Mine explosion-proof and intrinsic safety type, explosion-proof mark: Exd[ib]IMb

(3) Carbon monoxide sensor measurement range: 0~1000ppm

(4) Mine temperature sensor measurement range: (0~100)°C

(5) Mine intrinsic safety flame sensor output signal: flame present > 4.5V, no flame < 0.5V

(6) Smoke sensor output signal: high and low level signals

(7) Transmission distance: Ethernet communication uses twisted pair ≤ 100m; RS485 signal ≤ 10km

(8) Transmission mode: TCP/IP electrical signal transmission, transmission rate: 1200bps