| 摘要 |
A digital depth indicator for rotary earth drills, and particularly auger type drills, operates from the means used to lower and raise the drill. The indicator operates from either the wire or cable of a wire line hoist auger or the hydraulic fluid flow in a hydraulic Kelly hoist type machine. A rotary measuring device is provided with an incremental shaft encoder which rotates to produce a dual signal which is supplied to (1) an up/down digital counter and (2) a programmable DIVIDED N counter, which counter supplies a DIVIDED N pulse to the up/down digital counter. The programmable DIVIDED N counter is provided with switches for (1) setting the apparatus to read in feet or in meters and (2) setting the program for the drilling machine type or model. The output from the up/down digital counter is fed through a display driver to a digital display showing the indicated depth in feet or meters. In a wire line hoist auger, the rotary shaft encoder is operated by a rotary counter wheel which is rotated by movement of the wire line or cable lowering or raising the drill or auger. In hydraulic Kelly hoist type machines, the rotary shaft encoder is rotated by a hydraulic fixed displacement motor which measures the volume of hydraulic fluid supplied to the hydraulic cylinder of the Kelly hoist and registers as feet or meters of drill or auger movement.
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