| 摘要 |
PROBLEM TO BE SOLVED: To excellently perform blast processing on a square part of a square column and its vicinity by stably moving a device main body in the lenghtwise direction of the square column by attraction force to two adjacent outer wall surfaces containing the square part of the square column and driving force to drive the device main body through wheel members. SOLUTION: Wheel members 11A and 11B are held in a vertical posture by respective square column outer walls 1a and 1b, and when a blast device 10 moves in the vertical direction along a square column 1, the wheels 11A and 11B respectively and smoothly roll on the square column outer wall surfaces 1a and 1b. The blast device 10 is attracted to the respective outer wall surfaces 1a and 1b by reducing internal pressure of a space part 20 through a pressure reducing passage. In a condition where the blast device 10 is attracted to the square column outer wall surfaces 1a and 1b, a grinding/polishing/cleaning material accelerated by compressed air is projected toward the outer wall surfaces 1a and 1b containing a square part 1c from grinding/polishing/cleaning material nozzles 6 and 7. |
