Water-jet ice core drilling rig

A water-jet ice core drilling rig, comprising:

• a drilling barrel (2), wherein drilling barrel water channels (10) are disposed on an inner barrel wall of the drilling barrel (2);
• and
• a water-jet cutter head (3), wherein the water-jet cutter head (3) comprises an inner pipe (16) and an outer pipe (17), the inner pipe (16) and the drilling barrel (2) are coaxial, the inner pipe (16) is fixedly connected to an end of the drilling barrel (2), first water passages (18) are disposed on an outer side of an end of the inner pipe (16) facing towards the drilling barrel (2), the first water passages (18) are uniformly distributed along a circumferential direction of the inner pipe (16), the first water passages (18) are in one-to-one correspondence with the drilling barrel water channels (10), each of the first water passages (18) is connected with a corresponding one of the drilling barrel water channels (10), the outer pipe (17) is sleeved outside the first water passages (18), the outer pipe (17) is coaxially and fixedly connected to the inner pipe (16), and an annular water-jet nozzle (23) is defined between the outer pipe (17) and the inner pipe (16),
• wherein an end of the inner pipe (16) facing away from the drilling barrel (2) protrudes from an end of the outer pipe (17) facing away from the drilling barrel (2), and the end of the inner pipe (16) facing away from the drilling barrel (2) protrudes from the end of the outer pipe (17) by a length in a range of 1 mm to 2 mm, and an outer diameter of the end of the inner pipe (16) facing away from the drilling barrel (2) is 0.5 mm to 1.5 mm smaller than an outer diameter of the end of the outer pipe (17) facing away from the drilling barrel (2) by 0.5 mm to 1.5 mm.