Intermediate frequency heating pipe plastic liner device
A heating device and steel pipe technology, which is applied in the direction of tubular articles, other household appliances, household appliances, etc., can solve the problems of low production efficiency, complex structure, and large equipment volume, and achieve high production efficiency, simplify the device structure, and reduce the size of the device. volume effect
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[0009] In the following, the present invention will be further described with embodiments in conjunction with the accompanying drawings.
[0010] A pair of self-locking sealing plugs 13, 18 are made of steel. One end of the plug 13 is in the shape of a flat-top bottle stopper. The outer diameter of the stopper body is slightly smaller than the inner diameter of the lined plastic pipe 12. The diameter of the flat cover of the stopper body is equal to the outer diameter of the steel pipe 11, and an axial through hole 21 is opened in the stopper body. The outer port of the axial through hole 21 is equipped with a self-closing quick connector 8 for inflation, and a pull ring 14 is provided on the inner end of the plug; the other end plug 18 is a straight plunger with a diameter slightly smaller than the inner diameter of the lined plastic pipe, outside the straight plunger The end is provided with a ring groove that matches with the semicircular snap ring 19. A pull ring 20 is provide...
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