Multi function drill drive system

Details Multi function drill drive system Multi function drill drive system

E - Fixed Constructions

21

B

255/17

E21B 15/00 (2006.01) E21B 7/02 (2006.01) E21B 19/084 (2006.01)

Patent

CA 1051862

MULTI FUNCTION DRILL DRIVE SYSTEM ABSTRACT OF THE DISCLOSURE A drive system for a hoist-pulldown linkage of a blast hole drill employs a variable speed electric motor and a variable ratio coupling between the motor and the hoist-pulldown linkage. A first regulator actuates the electric motor for high torque operation when the ratio of the coupling is low. A second regu- lator means activates the electric motor for low torque operation when the ratio of the coupling is high. Transfer in coupling ratio is coordinated with change between regulators. The first regula- tor means is a voltage regulator with a current spillover limit. The second regulator is a voltage regulator with an adjustable pulldown force limit with means to select the rotational speed reference of the motor.

265593

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