Shandong water well drilling rig used in the first problem is that might appear when digging boreholes "run drills" phenomenon: so how did this come about, to look at it:
As bit of a diameter greater than the diameter of the rod of the shock Assembly, and longer, helped drill bit distance distance, combined with the drill Rod has a certain elasticity, so on the rocks in irregular cutting for prone to "run drills" phenomenon, is the axis of the rock drill. In this case if you continue drilling will cause the drill Rod bending, or even "don't drill" phenomenon, causes the drill to not work, and may also result in serious damage to the rig itself.
This is the Shandong water well drilling rig running drills, if you found this situation, to maintenance immediately.