Down-the-hole drill

Abstract

The invention discloses a down-the-hole drill comprising a drill body. Traveling mechanisms are arranged at the bottom of the drill body; a drilling frame is arranged on the drill body; hollow drilling rods are arranged on the drilling frame; the lower ends of the hollow drilling rods are connected with a down-the-hole impacter; the lower end of the down-the-hole impacter is connected with a drilling bit; a ventilation hole is formed in the drilling bit; the upper ends of the hollow drilling rods are connected with a power head; damping joints are arranged between the hollow drilling rods andthe power head; a high-pressure air pipe is connected to the power head; and an air compressor is connected to the high-pressure air pipe. High-pressure air flow inputting equipment is innovatively introduced on the power head, and meanwhile the damping joints are arranged between the hollow drilling rods and the power head, so that the problem of impact of high-strength reverse vibration force tothe power head during drilling of a large-hole-diameter blast cavity is effectively solved, the defect that a traditional down-the-hole drill cannot drill the large-hole-diameter blast cavity is overcome, and smooth conducting of mine development work is guaranteed.

Description

Technical field [0001] The invention relates to the field of mining drilling machinery, and more specifically, to a down-the-hole drilling machine. Background technique [0002] In the process of mining, it is often necessary to open a large number of blastholes, and then bury explosives in the blastholes to realize the blasting of the mine, and the drilling of these blastholes often requires special drilling equipment. Commonly used drilling equipment includes wire rope percussion drills, down-the-hole drills, and roller drills. Among them, wire-rope percussion drills have been gradually replaced by other drilling rigs due to their low efficiency; DTH drills use drill rods to drive the pneumatic impactor and drill bit together. Rotate, use the piston impact drill bit of the pneumatic impactor to break the ore rock, usually used in small and medium-sized mines to drill 80-250 mm diameter blastholes; the roller drill uses the rolling action of the roller bit to break the ore, suit...

AI Technical Summary

Problems solved by technology

At present, many mines generally use roller cone drills for the drilling of blastholes with a diameter of more than 250mm. Although the roller cone drill can realize the drilling of large-diameter holes, due to its huge size and heavy weight, the roller cone drill It is very inconvenient to move on the mine, especially in mines with uneven and sloped roads, so that the drilling efficiency of the roller cone drill is very low

Compared with the roller cone drilling machine, the down-the-hole drilling machine can move in the mine very conveniently. However, due to the limitation of the structure design of the down-the-hole drilling machine itself, the down-the-hole drilling machine can only drill into the hole with an aperture of 80-250mm, and cannot drill Enter the blast hole with a large aperture of more than 250mm, which greatly limits the smooth progress of mine development work

Images