ROLLING CUTTER DRILLING TOOL DEPTH TRANSDUCER FOR DRILLING BLAST HOLES Russian patent published in 2014 - IPC E21B47/04 G01B7/26 

FIELD: process engineering.

SUBSTANCE: invention relates to devices for drilling blast holes at open pits. Depth transducer comprises two pulse pickups, pulse counter with first and second inputs connected to interrupt unit and measurement initial setting unit, respectively, and indication unit. Note here the said pickup is equipped with inverters arranged in pairs, pulse shapers and logic elements "AND", pulse pickups being equipped with differentiation units. Note here that first pulse pickup is connected with first inverter and second pulse shaper. Second pulse pickup is connected with second inverter and first pulse shaper. Outputs of first inverter and pulse shaper are connected via first logic element "AND" with third input of pulse counter. Outputs of second inverter and pulse shaper are connected via second logic element "AND" with fourth input of pulse counter.

EFFECT: higher reliability of depth measurement.

5 dwg