FIELD: mining operations.
SUBSTANCE: invention relates to mining, namely to drill rod for rotary pneumatic drilling holes. The drill rod comprises a rod, a shank and an upset shoulder. The rod is made of a hexagon. The shoulder is mounted in two annular grooves to form a protrusion between them. The generants of the annular grooves mating with the surface of the rod make an obtuse angle. The rod comprises a central channel, the front end of the rod is formed with a conical surface. The minimum diameter of the rod (Ds), the width (a) and depth (h) of the annular groove, the height of the shoulder (B0) must satisfy the following relationship: h/a ≤ Ds/2·B0.
EFFECT: improved design.
6 cl, 9 dwg
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