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某矿区为极倾斜地层，岩石倾角一般在50°～70°左右，部分地区接近直立。若用直孔施工，不但增加钻探工作量，且由于钻孔与岩层夹角较小易造成坍塌；如操作不当，钻孔易顺层面歪斜，达不到地质目的。采用斜孔施工，必须按一定方向平筑机场、安装斜塔设备，本区多为高山，大大地增加了安运工作量，及辅助生产时间。在这种情况下，我们根据重力作用设计了重力定向偏心器，经多次改进
A mining area is extremely inclined strata, the rock dip angle is generally about 50 ° ~ 70 °, in some areas close to erect. If the use of straight hole construction, not only increase the drilling workload, and due to the smaller angle between the borehole and rock formation is likely to cause collapse; such as improper operation, drilling easy to level skew, reaching the geological objectives. With inclined hole construction, the airport must be built according to a certain direction and the leaning tower equipment should be installed. Most of the area is high mountain, greatly increasing the workload of security transportation and assisting the production time. In this case, we designed a gravity-oriented eccentric according to the gravity effect. After several improvements