| 摘要 |
PURPOSE: To apply sealing force in two directions by installing a circumferential direction abrasion shoe of a roughly triangular cross section on each end of a rotary drum, and installing an expansion tube in a roughly semi-cylindrical groove of each abrasion shoe. CONSTITUTION: A circumferential direction abrasion shoe 28 of a roughly triangular cross section is installed on each end of a rotary drum 10. A second side surface 36 has a roughly semi-cylindrical groove 50 extended along length of the abrasion shoe 28. An expansion tube 55 is installed in the roughly semi- cylindrical groove 50 of each abrasion shoe to get in contact with an inner surface 24 of an expansion tube holding member. An abrasion shoe holding member 40 has a surface to get in contact with a third side surface of the abrasion shoe 28. An expansion seal is thus capable of applying sealing force in two directions. |
