Monitoring and alarming system for primary and secondary air doors in underground coal mine

The utility model aims to provide a monitoring and alarming system for primary and secondary air doors in an underground coal mine, and aims to ensure the stability of a mine ventilation system, realize four-air-door linkage of a safety monitoring system among large pedestrian air doors mounted in a parking lot, and solve the problem of air flow short circuit caused by simultaneous opening of more than two air doors. In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the system comprises two groups of air doors which are arranged in a roadway and correspond to each other, door frames are arranged outside the air doors, and a monitoring alarm device is arranged at the right upper parts of the outer sides of the two groups of door frames; the bottom of the monitoring alarm device is connected with a sensing part arranged below the right upper part of the air door through a first transmission cable, the monitoring alarm device transmits a signal to a safety monitori