我队勘探矿区有很大一部分岩石是6~7级砂页岩与粉砂岩,以往都是采用钢砂钻进,由于钢砂在钻进中对煤层感党迟缓,因而打丢、打薄煤层现象经常发生。经在濉溪队观摩学习后,我们推行了单双粒合金钻头,比原普通(指探矿厂的)合金钻头提高效率70%。为了进一步提高这类岩层的钻进效率,我们又研究设计出两种新型钻头——飞机式钻头(如图)。 A large part of the rock of our exploration area is sandstones and siltstones of 6 to 7 levels. In the past, all of them were grit-boring. Since grit was sluggish to the coal seam during drilling, Phenomena happen often. After learning from the Suxi Team, we implemented a single-and-double-alloy drill, which increased the efficiency by 70% over the conventional alloy drill. In order to further improve the drilling efficiency of these formations, we have also studied the design of two new types of drill bit - aircraft type drill bit (pictured).