In down-the-hole drilling a drill rod is fitted with a hammer at its lower end. 

The hammer, which is mounted on the drill bit, is activated through the addition of compressed air and driven into the ground – simultaneously rotating and impacting. 

This method is mainly applied for hard to very hard rock and/or for penetrating large boulders.

Main feature:

1. The borehole drill rig with two-stage dry dust removal device, which has little pollution to the environment;

2. HW910 is equipped with dry dust collector, drill pipe changer, and adopts the most advanced design and layout.

3. It is a trusted machine for mining and construction companies and contractors engaged in presplitting and conventional production blasthole drilling.

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