Detonating chain

摘要

A detonating chain for use in particular in mining has a large number of triggering stages S1, S2, ..., each of which contains a series circuit which is connected between two supply lines (A, 0; B, 0) and consists of a thyristor T and a triggering device ZE. The signal voltage for the thyristor T of each stage is in this case derived just from the switching state of the thyristor T in the respectively preceding stage. In consequence, the activation is passed on from stage to stage independently of the triggering device ZE, and in particular independently of whether any fuze at all is connected and whether, as is correct during activation, the said fuze does or does not have high resistance. In this way, defects of known circuits are avoided, which can lead to the situation, when the electrical power supply is switched on, of the detonation originating not only at the first triggering stage but also, at the same time, at the point of a missing fuze, or the detonation sequence ending at the point of a fuze which is not operating correctly, or unacceptable delays occurring, and an excessive delay in consequence occurring to the interval between the electrical sequence and the explosion wave, and undesirable changes occurring in the pressure wave which is initiated by the detonation sequence. <IMAGE>