反循环钻机 meaning in Chinese

clean-out machine
reverse circulation drill

And a main enterprise manufacturing equipment for geological exploration and geotechnical engineering . it occupies about 200 , 000 m2 with a total construction area of 59 , 000 m2 and has about 120 million rmb of fixed assets and 1400 employees with more than 260 various specialists
连云港黄海机械厂是中装集团新大特钻机地下连续墙钻机旋挖钻机大口径反循环钻机的生产基地，也是我国地质勘探和基础工程施工设备的骨干企业。
The stroke reverse circulation drilling machine of czf2000 - 1800 type is produced by our company newly to adapt to the demand of percussion drill market due to the development of road and bridge industry , it is specializedly used for pore forming of pebble and gravel stratum and hard stratum
1800型冲击反循环钻机是我公司最新研制生产的为适应我国路桥事业发展对冲击钻机市场的需求，专门用于卵砾石地层、坚硬地层中成孔的钻机。