Study on Steel Ball Impactor for Rotary Percussion Drilling

摘要

The problem that drilling middle-soft to middle-hard formations with hard alloy rotary percussion drilling technology was put forward in the paper, which often occurred in drilling. Structure and working principle of a new kind of steel ball impactor for rotary percussion drilling was dissertated, at the same time, the anvil, key component part of steel ball impactor, was analyzed in detail. The results of outdoor and indoor rotary percussion drilling tests on steel ball impactor were introduced at length. The relational expression of blow frequency between air pressure and air quantity was set up with method of mathematical statistics based on tests research, which can be used for forecasting and controlling blow frequency and other important technological parameters of steel ball impactor. The study indicates that working performance of steel ball impactor is stable and reliable, drilling efficiency can be raised by big percentages and drilling cost can be cut when drill with steel ball impactor, it has a extensive application prospect.