Light curtain sensor based escalator main driving chain monitoring method and system

The invention discloses a light curtain sensor based escalator main driving chain monitoring method and system. The method comprises the steps of receiving a light receiving signal and a light shadingsignal generated by a light curtain sensor irradiating an escalator main driving chain; forming an image according to the light receiving signal and the light shading signal, and calculating the diameters of two adjacent pin shafts and the distance between the two pin shafts; and calculating the pitch and elongations of the two pin shafts; judging whether the elongations exceed the elongation range or not, and if yes, sending out an alarm signal. Through the light curtain sensor based escalator main driving chain monitoring method and system, the escalator main driving chain can be continuously monitored at high accuracy degree, the maintenance cost can be reduced, manpower resources can be saved, and hidden danger can be prevented. 本发明公开了基于光幕传感器的扶梯主驱动链监测方法及系统，其中方法包括：接收光幕传感器对扶梯主驱动链照射产生的受光信号和遮光信号；根据受光信号和遮光信号，形成影像，