CTQ-Z120Y Crawler hydraulic drilling rig is mainly suitable for rock blasting hole drilling in open mining, water conservancy, power plants, roads ect.

CTQ - Z 120y型履带式液压钻机主要适用于露天矿山开采，水利，电站，筑路等石方爆破孔凿岩。

The engineering practice has proved that these methods solved successfully the problem of great caliber drilling in weakly weathered rigid rock by hydraulic piling rig.

工程实践证明，这些方法成功地解决了上述条件下弱风化硬岩中大口径钻进的难题。

Analyzed causation of TK-3 hydraulic vertical shaft coring drilling rig easy to bring hydraulic chuck failure, get stuck with actuating rod etc, put forward two alteration schemes.

根据TK - 3型液压立轴式岩心钻机结构分析产生液压卡盘失灵、主动钻杆卡死等故障的原因，提出了两套改造方案。

The bonding technique was applied in maintenance of hydraulic workover rig and drilling pumps too.

还介绍了在液压修井机和钻井泵维修过程的应用情况。

The description covers full-hydraulic core drilling machines, portable drills, geo-thermal drills, offshore and beach sampling equipment, all-casing drilling rig, etc.

介绍的主要设备有全液压岩心钻机系列、轻便设备系列、地源热泵钻机、浅海及滩涂取样钻机、全套管钻机等。