Automatic dust-fall spray control system for tunnel, and control method thereof

The invention discloses an automatic dust-fall spray control system for a tunnel, and a control method thereof. The system is composed of a dust sensor, a data processor, a control host, a cloud monitoring system and a water spraying device; through arrangement of a dust monitor in a tunnel operation area, a signal is transmitted to a control center and the cloud monitoring system; dust concentration warning values of at least two different levels are preset; when the dust concentration of a monitoring site reaches or exceeds the warning values of different levels set through the dust sensor,a solenoid valve of the water spraying device is controlled to open for spraying water to a workplace for dust fall; and through control over different opening degrees of the solenoid valve and different water flow rates corresponding to the warning values of different levels, dust of the workplace is reduced. According to the control system, through setting of multilevel warning thresholds, harmsare restrained at the emb