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Dth drilling a down-the-hole drill, usually called dth is mainly a pneumatic powered rock or ground drill, in which the percussive hammer is located directly behind the drill bit, so the percussion mechanism follows the bit down into the drill hole. the drill pipes transmit the necessary feed force and rotation to the dth hammer […]

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Yg down the hole drilling is widely used in metallurgy, mining, railway, hydropower construction, and underwater drilling and blasting projects.

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