REMOVER FOR FOREIGN MATTER IN PIPE

PROBLEM TO BE SOLVED: To efficiently remove foreign matters sticking to a throttle nozzle part in a pipe. SOLUTION: The tip 2a of a guide part 2 in a foreign matter remover A is in the shape of a frustum. The remover A is moved in a pipe 10 until the tip 2a comes into substantially complete contact at its outer periphery with the inner periphery of a substantially conical throttle nozzle part 10a, in which at least one of plural rollers 3 comes into contact with the inner periphery of the pipe 10 and the center axis of the remover A coincides with that of the pipe 10. That accurately brings a corkscrew foreign matter-removing member 4 on the tip of a rod 8 being near a foreign matter 16 sticking to the opening of the pipe. The foreign matter-removing member 4 is then elongated by the rotation of the rod 8 until it gets into and holds the foreign matter 16 twined therearound. The remover A is subsequently backed to remove the foreign matter 16 from the sticking part and is finally taken out of the pipe.