Importance

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Abstract

A smoothing device, according to the present invention, is used to perform smoothing in a conduit line, or the like. The smoothing device has a fluid pressure motor with a cutter attached to its output shaft and guide rollers for guiding the smoothing device in the longitudinal direction of the conduit line. Prescribed ones among the guide rollers are relatively movable in the radial direction of the conduit line by fluid pressure cylinders, springs, or the like, and pressed against the inner wall of the conduit line. The remaining guide rollers are fixed to the smoothing device with respect to the radial direction of the conduit line so as to have an automatic aligning mechanism, thereby keeping the rotatable cutter along the center of the conduit line. In the fluid pressure motor, turbine and water nozzles, for injecting water to the turbine, are detachable, facilitating the replacement of worn parts. To easily advance the smoothing device, a propelling device, using a plurality of propelling shafts connected by universal joints with rollers disposed near the connected portions of the shafts and using screws, is provided. To facilitate the discharge of the removed debris and drainage, a high-pressure water jet pump is provided. The coupler absorbing the rotation is attached to the front face of the cutter thus enabling the smoothing device to be towed in the direction of the cutter with a rope.

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First Claim