FOREIGN MATTER REMOVING DEVICE AND METHOD

摘要

The invention provides a foreign matter removing device and method for easily removing foreign matter such as scale adhering to the inner surface of a pipe 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 the pipe (P) by using the holder (11), until it stops in a region (A) where oxide 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 of 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.