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The impact energy of the existing rock drill , the gas leg type is about 6~8kg·m; the impact frequency is no more than 2000 times/min for the hand-held type, the air leg type is not more than 2600 times/min, and the upward type is not more than 3500 times/min. The type can reach 4000 times/min; the torque, the air leg type is generally 120-180kg·m; the weight, the hand-held type is 20-25kg, the air leg type is 20-30kg, and the rail type is 40-90kg.
When selecting a rock drill , the following points should generally be considered:
Working conditions: roadway, patio, shaft, stope, field, etc.;
Drilling parameters: direction, diameter and hole depth of the borehole;
Rock properties: hardness, strength and drillability.
Refer to Table 1 for general selection.
Table 1 Application of various types of pneumatic rock drills
project
Types of
Handheld
Air leg
Upward
Rail type
Recommended eye diameter (mm)
≯40
≯45
≯50
≯75
Recommended eye depth (m)
≯3
≯5
≯6
≯20
Drilling direction
Horizontal, tilt
Vertical down
Horizontal, upturn
And down
Vertically up,
Upward 60°～90°
Horizontal, upward and
Slow down
Mineral rock properties
Coal and various rocks
Hard, hard,
Extremely hard
Medium hard, hard, very hard
Hard and hard