| 摘要 |
PROBLEM TO BE SOLVED: To provide internal surface cleaning equipment for plated steel pipe with which 'slobbery stain of molten metal' can be completely removed from the internal surface of the steel pipe just after plating by improving an existing gas injection nozzle. SOLUTION: In the internal surface cleaning equipment for plated steel pipe, which has a gas nozzle pushed against one end of the steel pipe directly after plating with molten metal and used to blow off the slobbery stain of the molten metal deposited on the internal surface of the steel pipe, a bar-shaped body capable of back-and-forth motion is inserted into the above steel pipe and a gas passageway regulation member is attached to the end of the bar-shaped body and, further, the maximum outside diameter of the gas passageway regulation member is made to a size capable of forming a narrow clearance between the inside diameter of the steel pipe and itself.
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