Abstract
In view of the problems of low efficiency and large human factors in the current quality acceptance of underground drilling construction in coal mine, which mainly depends on the manual counting of drill pipes during drilling withdrawal, a portable drilling depth measurement device is designed based on the principle of mechanical wave reflection in drill pipe string, using the propagation speed of mechanical wave in the drill string and the time of one cycle of mechanical wave back and forth in the drill string, the length of drill string in the drill hole is calculated and the drilling depth is determined. The designed mine drilling depth measuring device is mainly composed of three parts: exciter, probe and host. The key functions of data processing and human-computer interaction are realized by the software and hardware of the host. The field tests in Dafosi Coal Mine and Sihe Coal Mine verify that the measuring depth of the device is greater than 200m and the maximum error is no more than 10m, which can meet the urgent needs of underground hole depth measurement in coal mine.
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