Water jet peening device

A water jet peening device, comprising:

• a spray nozzle provided along with a positioning member positioned at an upper end of an instrumentation tube support, and includes a spray port to spray water jet;
• a swiveling mechanism that swivels the spray nozzle around a central axis of the instrumentation tube support, said central axis passing through the center of the positioning member, said positioning member positioned at the upper end of the instrumentation tube support;
• a lift mechanism that raises and lowers the spray nozzle in a vertical direction with respect to the positioning member positioned at the upper end of the instrumentation tube support;
• a water supply tube including an end portion, where the end portion is bent toward the central axis at a first angle with respect to the central axis;
• and
• a rotation mechanism that supports the spray nozzle, the spray nozzle configured to be rotated by the rotation mechanism while centered on a rotation shaft center located adjacent to the end portion,
• wherein the rotation mechanism is disposed at the end portion, and
• wherein the spray nozzle is disposed on the rotation mechanism and includes a spray port, and
• wherein the spray port is offset from the rotation shaft center such that the spray port rotates eccentrically about the rotation shaft center, wherein the spray port is inclined toward the rotation shaft center at a second angle with respect to the rotation shaft center, and
• wherein the rotation mechanism includes
• a pinion gear provided concentrically on the rotation shaft center,
• a rack gear that meshes with the pinion gear, and
• a cylinder that is connected to the rack gear and actuates the rack gear.