COATING APPARATUS OF SOCKET INNER SURFACE OF CAST IRON PIPE

摘要

PROBLEM TO BE SOLVED: To easily and surely prevent a coating material from adhering to an inner surface of a straight part when a socket inner surface of a cast iron pipe is coated.SOLUTION: Air is supplied to an inside of a cast iron pipe 1 from a side of an inserting mouth 1c aiming at a side of a socket 1b using an air supply machine 50. A coating material sprayed on an inner surface of the socket by a wind pressure of the air is easily prevented from being dispersed to a side of a straight part 1a. The coating material does not adhere to a cast iron pipe 1 by mistake because coating apparatuses such as nozzles 20 and the air supply machine 50 do not contact to the cast iron pipe 1 physically.