| 摘要 |
PROBLEM TO BE SOLVED: To prevent the leakage of powder in a branch path by providing selector valves for switching the transport direction to a branch position in an upper air duct and a lower air duct, respectively. SOLUTION: Powder such as cement is supplied to an upper duct 1, and pressurized air is supplied to a lower duct 2. The pressurized air flows into the upper duct 1 through the clearance of a cloth 3 to transport the powder. When upper and lower selector valves 4, 6 are set to the actual line positions, the powder and air are carried in the arrowed direction (a). Even if the powder is leaked to a branch path shown by the arrow (b) through the clearance between the upper selector valve 4 and the upper duct 1 or cloth 3, the lower selector valve 6 prevents the air from flowing to the lower duct 2 shown by the arrow (b), and the leaked powder is never carried in the upper duct 1 in the arrowed direction (b). When the upper and lower selector valves 4, 6 are switched to the positions shown by the broken line, also, the powder is similarly carried in the arrowed direction (b). Therefore, even if the powder is leaked in the arrowed direction (a), the air is never carried in the arrowed direction (a) in the lower duct 2, and the leaked powder is prevented from being carried in the upper duct 1 in the arrowed direction (a).
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