HIGH-FREQUENCY INDUCTION HEATING TYPE APPARATUS AND METHOD FOR PRODUCING ENAMEL-COATED LONG-SIZED METALLIC PIPE

摘要

PURPOSE:To produce inexpensively a titled long-sized pipe having high quality and corrosion resistance by supporting rotatably both ends of the long-sized pipe glazed with enamel on both inside and outside surfaces and mounting movably the long-sized pipe to a high-frequency induction heating device. CONSTITUTION:The long-sized pipe 7 glazed with enamel on the inside and outside surfaces is supported and connected respectively via connecting pieces 8 to a driving shaft 6 and holding shaft 9 held by bearings 5 of bearing stands 4. The circumference of the pipe 7 is enclosed by an annular inductor 11 attached to a supporting base 14 on a traveling carriage 13. The carriage 13 is moved to position the inductor 11 to the end the pipe 7 on the shaft 9 side and a motor 1 is run to rotate the pipe 1. Traveling of the carriage 13 is started and at the same time high-frequency current is conducted to the inductor 11 to heat successively the part of the pipe facing said conductor while the carriage 13 is traveled gradually, by which the enamel of the pipe 7 is successively calcined from one to the other end.