The down-the-hole drilling rig can drill holes in rocks with medium or medium hard (f ≥ 8). Like the rock drill, it has a rock drilling process for impact, rotation, slagging and propulsion. The difference is that the impact mechanism of the downhole drilling rig is mounted on the front end of the drill pipe and sneaked into the bottom of the hole. The extension continues to advance. The down-the-hole drilling rig is named after the impactor sneaked into the hole.
DTH drilling rigs are not like the drilling of rock drills. The energy loss increases with the lengthening of the drill rods, so deep holes and large holes can be drilled. When used for open drilling, the drilling speed is compared with steel rope impact drilling rigs. Increased by 2~3 times, the degree of mechanization is higher, the auxiliary operation time is less, and the drilling machine operation rate is improved; the down-the-hole drilling rig is light in weight, flexible in maneuverability, low in investment cost, especially capable of drilling inclined holes, which is beneficial to controlling the grade of ore, Increase the stability of the slope, eliminate the roots and improve the quality of the blasting.
The characteristics of the down-the-hole drilling rig: the energy loss does not increase with the lengthening of the drill rod; the noise of the working surface is greatly reduced; the degree of mechanization is higher, the auxiliary working time is less, and the drilling machine operation rate is improved.
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