METHOD OF MEASUREMENT OF RATE OF MINE VENTILATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 1996 - IPC

FIELD: mine automatic equipment for automatic monitoring of air speed in driving and extraction mine areas, on haulage ventilation drifts. SUBSTANCE: several sensing elements are installed in different positions of the working height. Sensing elements in the form of hollow nonsealed balls are suspended on elastic cords. Ventilation rate is determined according to the total length of the cords. The cord is made in the form of a thread loop of conductive rubber placed in an insulating elastic shell, for example of rubber or latex. All threads are successively connected to the inputs of the indicating instrument (ohmmeter). EFFECT: enhanced sensitivity and reliability, simplified design. 2 cl, 2 dwg