The hydraulic seam drill is equipped with the synchronous gear motor as the driving part, which can effectively solve the corrosive problem of the emulsion to the motor body.
乳化液煤层液压钻使用同步马达作为其驱动元件，可有效解决乳化液对马达机体的腐蚀问题。
2
During drilling process, screw drillmotor sometimes doesn't work properly or even seriously damaged because of sand jamming.
在钻井施工作业中，螺杆钻具常因砂卡导致螺杆马达工作失效，导致螺杆钻具报废，严重影响了正常钻井作业。
3
After pearl rotates for 180 o, pull (1) hand towards motor, then begin to drill hole until the pearl is holed through.