KHJ-HX type coal mine wind power methane blocking deviceDetailed product description：

Scope and Application
KHJ-HX coal mine wind turbine methane interlocking device (hereinafter referred to as interlocking device). It is a new type of wind power methane blocking device manufactured by our company after years of research and development, using the latest computer technology. The design and manufacturing of the product comply with the requirements of relevant standards such as MT631-1996 "General Technical Conditions for Methane Interlocking Devices for Coal Mine Wind Power" and GB3836.1-4-2000 "Electrical Equipment for Explosive Gas Environments". It has the characteristics of easy installation, long communication distance, high contact output power, and long service life.

Nowadays, a large number of power outages and telemetry devices are used in various coal mines in China, and various monitoring systems are installed. However, malignant gas explosion accidents continue to occur in the excavation face and return air duct. This is because power outages and telemetry devices, due to their functional limitations, cannot reliably achieve wind, electricity, and methane interlocking functions. In addition, various monitoring systems and power outage device interlocking control functions are not yet perfect, making it difficult to accurately achieve wind, electricity, and methane interlocking functions. Therefore, they cannot meet the series of technical requirements for underground safety equipment in coal mines.

The KHJ-HX coal mine wind turbine methane interlocking device consists of three KGJ4-HX methane sensors (T1, T2, T3) and one air duct sensor, which can reliably achieve wind, power, and methane interlocking functions. It is a safe and reliable multifunctional methane detection equipment that can prevent the occurrence of malignant accidents such as gas explosions in coal mine underground working faces and return air tunnels, and is suitable for various methane gas mines.

Main functions
1. When the locking device is not powered or loses power during operation, it can cut off the power supply of the entire monitoring area's power equipment and local fans and lock them. And manual control of the power supply for the fan and power equipment can be implemented.
2. The locking device can continue to lock the controlled equipment in the monitoring area within one minute of power on.
3. The local fan can only be started after the locking device is powered on for one minute and the methane concentration in the wind stopping area is not greater than 1.00% CH4. And the fan can be manually unlocked.
4. When the local fan is powered off or the air volume in the duct is lower than the predetermined value, the power supply in the air supply area can be cut off and locked.
5. When any methane sensor is disconnected or powered off, the power supply to the monitoring area of the sensor can be cut off and locked.
6. When the methane concentration in the excavation face or return airflow exceeds 1.50% CH4, the power supply to the corresponding sensor monitoring area can be cut off and locked. Only when the methane concentration drops below 1.00% CH4 can it be manually restored to electricity.
7. When the methane concentration in the series ventilation airflow reaches 0.50% CH4, the power supply in the connected area can be cut off and locked. When the methane concentration drops below 0.50% CH4, manual restoration of electricity can be carried out.
8. When the methane concentration in the monitoring area of the methane sensor is greater than 1.00% CH4 (0.50% CH4 or selected), and the sensor is disconnected or powered off, the local fan does not start, and the working face air volume is insufficient, the locking device emits an audible and visual alarm signal,
9. The sound and light alarm is composed of a red light-emitting diode and an audible police alarm.

Main technical parameters
1. Explosion proof form: Mining explosion-proof and intrinsic safety explosion-proof mark: Exd [ib] I
2. AC power supply: 380V/660V. +15%~-20%, capacity less than 50VA
3. Measurement range: 0~4.00% CH4
4. Input quantity: Three analog signals (frequency signal of 200~1000Hz), one air volume switch signal, and one local fan status (switch) signal input to the host (all of which are intrinsic safety type)
5. Output: Four control switch outputs (to the controlled electrical equipment)
6. Intrinsic safety power supply parameters: Rated voltage: 16V Rated current: 200mA Maximum open circuit voltage: 16V
Maximum short-circuit current: 370mA overcurrent protection setting value: 320mA overvoltage protection setting value: 21V
7. Cable length not exceeding 1000m, cable distributed capacitance: 0.1uf/km, distributed inductance: 1mH/km
8. Power off contact capacity: 36V/5A, AC;  220V/3A，AC
9. Working environment: Working temperature: 0~40 ℃; Relative humidity: ≤ 98%; Atmospheric pressure: 80~110KPa
An environment with explosive hazards such as methane and coal dust; Dimensions: 450 × 350 × 200mm; Weight: 50kg
10. Methane sensor: KGJ4-HX methane sensor; Explosion proof form: mining explosion-proof and intrinsic safety type; Explosion proof mark: Exd [ib] I
Intrinsic safety power supply: DC16V/200mA; Measurement range: 0~4.00% CH4
Measurement error: 0~1.00% CH4 ± 0.10%>1~2.00% CH4 ± 0.20%>2~4.00% CH4 ± 0.30%
11. Transmission distance: YZ3 × 1.52+1 × 1.02mm cable length 1000m cable with distributed capacitance: ≤ 0.1uF/km, distributed inductance: ≤ 1mH/km.
12. Working environment: Working temperature: 0~40 ℃; Relative humidity: ≤ 98%; Atmospheric pressure: 80~110KPa. Dimensions: 200 × 160 × 50mm. Weight: 2.4kg.