| 摘要 |
<p>PROBLEM TO BE SOLVED: To extend the lifetime of a transportation cylinder and to lighten it. SOLUTION: Transportation cylinder 18a, 18b, which are installed so as to be communicated with two suction discharge ports 2a, 2b provided abreast in the front and lower part of a hopper 1, is made so that the inside diameter is uniform in the longitudinal direction, the outside diameter is a taper-shaped and is increased gradually to the direction of a discharge side, and the maximum wall thickness t2 is achieved at the discharge side. Even if the inner periphery surfaces in the discharge sides of the transportation cylinder 18a, 18b are worm to become large diameters caused by the use of a long period of time, the lifetime can be extended because of the sufficient wall thickness in the discharge side. The wall thickness of the washing room side is left to be thin, allowing the lightening compared with the case where the wall thickness over the full length is made thick.</p> |
