Drill rod clamping device

A drill rod clamping device consists of an upper pressure plate 5, a lower pressure plate 6, a die 7, and a bolt 8; the upper pressure plate 5 and lower pressure plate 6 are annular plate with a plurality of die grooves 9 distributed uniformly; the upper pressure plate 5 has a plurality of through-holes 10 distributed uniformly, and the lower pressure plate 6 has the same number of threaded holes 11 distributed at the corresponding place; both the die 7 and the die grooves 9 are in a dovetail form. In addition, base surface of the upper pressure plate 5 has a plurality of grooves 12/lug bosses 13 distributed symmetrically and uniformly, top surface of the lower pressure plate has the same number of lug bosses 13/grooves 12 at the corresponding position, the grooves 12 match with the lug bosses 13, and the grooves 12/lug bosses 13 and the die grooves 9 distribute in a staggered way; the die 7 is also provided with a die tooth 14. By the adoption of the mentioned technical scheme, compared with the prior art, t