HIGH-PRESSURE NOZZLE DEVICE

PROBLEM TO BE SOLVED: To provide a high-pressure nozzle device which improves construction easiness and a construction accuracy (flatness of a cut surface) in a narrow part.SOLUTION: A high-pressure nozzle device which injects high-pressure jets WJ, colliding with each other, from a pair of nozzles 11 provided on a branch pipe 12 to cut a cut surface by the high-pressure jets WJ includes: a hollow rod 13 which is supported by the branch pipe 12 at a tip thereof and arranged on a plane passing through a pipe axis of the branch pipe 12 to introduce a high-pressure fluid to the nozzles 12; a counterweight 14 which has a weight approximately equal to the sum weight of the branch pipe 12 and the rod 13 and is arranged approximately coaxially with an axis AR of the rod 13 and at the rear side of the rod 13; a first reciprocating mechanism 16, 18 which is housed in a housing 15 and reciprocates the rod 13 in a direction of the axis AR; and a second reciprocating mechanism 17, 18 which is housed in the housing 15 and reciprocates the counterweight 14 in opposite phase to the rod 13 and in the direction of the axis AR.