dth boring machine

XZQ229 down-the-hole drilling rig down-the-hole drilling rig Expert evaluation: The down-the-hole drilling rig is a medium-sized integrated down-the-hole drilling rig developed mainly for various types of mines such as quarries, cement mines, and open-pit coal mines. It can complete the drilling construction of main blast holes and pre-split holes. Down-the-hole drilling rigs have the characteristics of large drilling diameter, high drilling efficiency, and wide adaptability.