Detonating primer having delay circuit and system for electrically blasting detonating primers

摘要

An electric blasting system for blasting a plurality of delay type detonating primers (29) connected to an electric blaster (10) is provided wherein each detonating primer (29) comprises a capacitor (2), a delay circuit (1) connected to the capacitor (2), an igniting resistor (26) connected to an output (1e,1f) of the delay circuit (1), a fuse head (27) on the igniting resistor (26) and a main explosive (28) by the fuse head (27). A first part (53) of a two-part electrical connector is connected to the face ends of a first pair of lead wires (51a,51b) connected to respective ends of the capacitor (2). A second part (54) of a said two-part electrical connector is connected to the face ends of a second pair of lead wires (52a,52b) also connected to respective ends of capacitor (2).;Connector parts (53,54) of adjacent detonating primers (29) can be connected together to form a series arrangement of detonating primers. The detonating primer (29) at one or each end of the series arrangement is connected to the blaster (10) by co-operating connector parts (53,54).