Importance

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Abstract

An explosive charging apparatus for charging controlled amount of explosives sequentially to bores drilled in a rock surface. The charging apparatus includes an explosive charging pipe, a boom mechanism carrying the explosive charging pipe, boom actuators for actuating the boom mechanism so that the explosive charging pipe is moved to a desired position, a control circuit for controlling the boom actuators and the explosive charging pipe. The control circuit includes a memory circuit having memories concerning locations, directions and depths of bores drilled in a rock surface, a processor for addressing memories of one of the bores in the memory circuit, a transducer for converting the addressed memories in the memory circuit to values of movements of the boom actuators, a servo control circuit for receiving outputs from the transducer and controlling operations of the boom actuators to locate the explosive charging pipe against one of the bores drilled in the rock surface, a charge depth setting device for setting a desired depth of explosive charging, a charge control circuit operable upon completion of operation of the servo control circuit for controlling the explosive charger so that explosives are charged to the desired depth in accordance with outputs of the charge depth setting device and applying a signal to the processor upon completion of explosive charging operation so that memories on another bore is addressed to perform another cycle of operation.

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First Claim