APPARATUS AND METHOD FOR REMOVING FOREIGN OBJECT

摘要

The invention provides a foreign matter removing device and method for easil y removing foreign matter such as scale adhering to the inner surface of a pip e in a short time by a simple installation or method. It is arranged that a holder (11) is mounted on the end of a pipe (P) and a grinding auxiliary member (16) fixed to the front end of a support arm (15) is inserted into th e pipe (P) by using the holder (11), until it stops in a region (A) where oxid e scale (S) forms in large amounts, and that abrasives are fed under pressure into the pipe (P) by a blast device (14), thereby increasing the flow rate o f abrasives in the scale grinding region (A) to achieve reliable grinding and removal of the oxide scale (S). Further, as the need arises, a spiral groove (17) is formed in the outer periphery of the grinding auxiliary member (16) to produce a rotational flow, increasing the centrifugal force on the abrasives .