Pneumatic DTH ( Down - The - Hole ) hammer is one of main pneumatic percussive - rotary drilling equipments.

风动冲击器是气动冲击回转钻进的主要设备之一.

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Top drives have played a major role in improving rotary drilling efficiencies.

滑动钻进提速,提升了井底控制能力.

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The research provides a firm foundation for promote the Rotary Drilling Rig's quality.

研究结果为进一步提高旋挖钻机质量奠定了基础.

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XGR 18 type multi functional rotary drilling rig developed by basic company fill gaps in the province.

基础公司研制的XGR18型多功能旋挖钻机填补省内空白.

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Jamming often takes place during percussion rotary drilling.

用冲击回转式凿岩机凿岩时卡钎是经常发生的.

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