| 摘要 |
This device comprises a laser head (10) designed to be placed inside a tubular element (12) is provided with an aperture (34) intended for the exit of a working laser beam and arranged on a movable portion (18) of the head. This movable portion (18) is driven in rotation by a motor located on the outside of the tubular element and connected to the movable portion (18) by a flexible shaft (40) and a speed reducer (38). The latter, arranged in a fixed portion (20) of the head in the vicinity of the movable portion (18), comprises five epicyclic gears (50A to 50E) coupled in series. The device is used for the sleeve lining of the primary-water tubes of a steam generator of a pressurized water nuclear reactor.
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