Electronic release actuator for mine explosions - with primary amplifier optical coupler and capacitor discharge ignition circuit

摘要

Electronic release as actuator for mine explosion techniques in mining is tripped by an intrinsically safe detector which switches on an igniter thus firing a charge which in turn releases the extinguishant. The amplifier involved in the firing circuit is a primary amplifier coupled via a transistor controlled optical coupler to an electronic ignition amplifier with associated transistor. This in its turn controls a switching thyristor forming part of an ignition current circuit with fitted ignition capacitor and a ranged upstream of the multiple ignition circuit. The primary amplifier uses thermal elements for detection purposes. The main amplifier (2) and the ignition circuit each have their own supply. A relay operated discharge contact (d4-1) is allocated to the condenser.