| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve work efficiency by eliminating a working process such as a recovering process for steel grids and a conveying process for steel grids, in which interrupting of a grinding/polishing/cleaning work has been required. SOLUTION: A grinding/polishing/cleaning apparatus for the inner surface of a pipe travels in the pipe at a given speed by a traveling unit 2 while injecting a super high pressure liquid to the inner wall surface of the pipe, of which the injection nozzle 14 having a plurality of injection openings 14a is rotated centered at a rotary axis installed approximately vertically on the inner wall surface of the pipe 7 and which is rotated in the circumference direction of the pipe. Further, an extrusion mechanism for the injection nozzle 14, which extrudes the injection nozzle 14 in the radial direction of the pipe 7, is installed on a rotation mechanism rotating in the circumference direction of the pipe and then the extrusion mechanism for the injection nozzle 14 is driven by a torque motor 19 through an extrusion mechanism driving shaft 18 penetrating the rotation center of the rotation mechanism, and a distance holder 28 holding the distance from the inner wall surface of the pipe 7 at a given value is installed at an injection nozzle part 8 fitted with the injection nozzle 14.</p> |
