There are several types of underground monitoring sensors in coal mines. According to their usage scenarios and safety requirements, underground monitoring sensors in coal mines are mainly divided into three types: explosion-proof, explosion-proof and intrinsically safe, and general mining type. Explosion proof sensors are suitable for environments with explosive gases or vapors, and can effectively prevent internal explosions caused by external explosive mixtures. This type of sensor, through its unique design, ensures that even if an internal explosion occurs, it will not trigger an explosion in the external environment, ensuring safety underground. Explosion proof and intrinsic safety sensors combine the advantages of both explosion-proof and intrinsic safety types. The design of intrinsic safety sensors takes into account the overall energy consumption and heat generation of the equipment, ensuring that it does not generate sufficient energy to cause external explosive mixtures to explode. This type of sensor can operate safely in environments with potential explosion risks, while also having good protective performance. Although general mining sensors do not have requirements for explosion-proof and intrinsic safety, they still need to meet certain safety standards when used underground in coal mines to ensure stability and reliability in the underground environment. For example, the ultrasonic flowmeter and ultrasonic level gauge produced by Qingdao Shenyu Automation Technology Co., Ltd. are both explosion-proof and intrinsically safe products. This means that these devices can not only operate safely in environments with explosive gases, but also ensure the safety of the external environment to a certain extent, providing reliable technical support for monitoring work underground in coal mines.

2. Equipment needs to be installed on the underground filling pipeline

The underground filling pipeline needs to be equipped with five categories of equipment: flow metering, pressure monitoring, valve control, filtration, and mixing, to ensure a stable and efficient filling process.

2. Introduction to pressure monitoring equipment: Pressure sensors (pressure signal converted to electrical signal) and pressure gauges (intuitive numerical display) are typical configurations. Function: Real time monitoring of pipeline pressure changes, prevention of high pressure damage or low pressure blockage problems, ensuring filling continuity. Valve introduction: such as gate valve (fully open/fully closed control), ball valve (quick switch seal), butterfly valve (simple structure and easy operation). Function: Adjust flow rate and on/off control, adapt to the operational needs of different filling stages, and improve system flexibility.

4. Filter Introduction: Most of them are filter type mechanical filters that intercept large particle impurities.

5. Mixer Introduction: Sta

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