F - Mech Eng,Light,Heat,Weapons – 42 – D
Patent
F - Mech Eng,Light,Heat,Weapons
42
D
F42D 1/06 (2006.01) F42D 1/055 (2006.01)
Patent
CA 2147676
A sequential blasting system for use in particular in mining comprises a plurality of detonator stages S1, S2, ..., each of which contains a series circuit consisting of a thyristor T and a detonator means ZE, said series circuit be- ing interposed between two supply leads A, O; B, O. The sig- nal voltage for the thyristor T in each stage is derived solely from the switching state of the thyristor T of the preceding stage. This causes activation to be transferred from stage to stage independently of the detonator means ZE, in particular irrespectively of whether or not a detonator has been attached and whether or not this detonator becomes highly resistive or not as it should upon being activated. This eliminates the errors that have occurred in known cir- cuits. Upon firing the blasting system, such errors can cause the detonation to occur not only at the first detonator stage, but simultaneously at a location where a detonator is missing as well. In other cases, such errors terminate the detonating sequence at the site of an improperly functioning detonator and induce impermissible delays and thus consider- ably shorten the length of time between the electrical se- quence and the blast, thus causing undesirable changes in the shock wave caused by the blasting sequence.
Ritter Heinz
Steinbichler Wolf
Euro-Matsushita Electric Works Ag
Kirby Eades Gale Baker
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