Based on the monitoring requirement on the main ventilators at coal mines,this paper put forward the principle for designing signal sampling device at large section ducts.

• 结合煤矿主通风机监测的要求,提出了大截面风道流量信号采集装置的设计原则,并设计了变截面、全压管、复合管、背压管流量信号采集装置;