FLAW DETECTION METHOD OF MOTOR FIXING BOLT OF JET FAN

PROBLEM TO BE SOLVED: To solve such a problem that it is necessary to periodically perform inspection such as the existence of cracks on a motor fixing bolt for a jet fan arranged on the ceiling of a road tunnel, capable of rotating at a high speed and subjected to exhaust gas of automobiles or the...

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Bibliographische Detailangaben
1. Verfasser:	EGUCHI KAZUHIDE
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To solve such a problem that it is necessary to periodically perform inspection such as the existence of cracks on a motor fixing bolt for a jet fan arranged on the ceiling of a road tunnel, capable of rotating at a high speed and subjected to exhaust gas of automobiles or the like, and a snow melting agent or the like, but the inspection work of the large-sized jet fan arranged on the ceiling of the tunnel is extremely difficult.SOLUTION: A method capable of surely and quickly inspecting the motor fixing bolt in a state that the jet fan is attached to the ceiling of the tunnel is provided. In the method, a bolt polishing tool 5a composed of a rod-like trunk part 1, a milling machine 2a attached to the tip of the trunk part 1 and an operation lever 4 attached to the other end is used. The bolt polishing tool 5a is inserted from an outlet or a suction port of the jet fan, the operation lever 4 is operated on the outlet or the suction port to plane the head of the motor fixing bolt, and then flaw detection operation is performed.