A rod rotation speed measuring device for catching apoplexy light -duty down -hole drill of medium -length hole presses

The utility model discloses a rod rotation speed measuring device for catching apoplexy light -duty down -hole drill of medium -length hole presses, the chamber bores the problem of excavating unableaccurate grasp rig rotational speed in the construction of exploding in the pit to have solved among the prior art wind pressure medium -length hole light -duty down -hole drill. On the coaxial drilling rod that is fixed in down -hole drill and can be along with the detection gear of drilling rod synchronous revolution, be located the installing support of detection gear one side, install the sensor that is used for detecting the detection gear rotational speed on the installing support through fastening nut, the intelligent rotational speed digital indicator that is connected through lead wire and sensor. The utility model discloses simple structure, design scientific and reasonable, convenient to use can real -time supervision rig rod rotation speed, provides accurate data for the regional detailed engineering g