HYDRAULIC MACHINERY HAVING DRAFT TUBE LINER AND DRAFT TUBE

摘要

PPROBLEM TO BE SOLVED: To provide a draft tube liner 10 of hydraulic machinery capable of suppressing the numbers of times of transportation, lifting down, and connection without decreasing draft tube pieces. PSOLUTION: The draft tube liner 10 is divided into a plurality of draft tube pieces 10a to 10d in the longitudinal direction so that inner draft tube pieces 10b and 10d of smaller sizes can be stored in outer draft tube pieces 10a and 10c of larger sizes in the form of nesting. Rollers 11 for drawing are fitted to the bottom parts of the inner draft tube pieces 10b and 10d, and locking parts 12 are fitted to the openings of either of the draft tube pieces 10a to 10d. Thus, two draft tube pieces can be transported and lifted down at a time, the inner draft tube pieces can be smoothly drawn by utilizing the rollers 11 for drawing, and they can be welded to each other at portions in contact with the locking parts 12. PCOPYRIGHT: (C)2006,JPO&NCIPI