| 摘要 |
PURPOSE: A beaver-tail tube assembly body and a method of exchanging a tube are provided to make a common tube changer accept or replace a beaver-tail tube assembly body without using a spacer plate. CONSTITUTION: An upper part of a main body of a tube in beaver-tail tube assembly bodies(30a,30b) is combined in a circular orifice(5) of a plate(3), and a vertical shaft(L1) is arranged, hanging an angle to a line crossing on parallel faces(4a,4b) of each plate. Herein, the angle is between 22 and 55 degrees. In addition, the generation of contact between crosspiece type lower end units(15) of the beaver-tail tube assembly body is prevented, and the assembly work is simple since the beaver-tail tube assembly body is produced with a method of combining together after additionally molding the plate and the main body of the tube.
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