| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize an auxiliary gas supply device for air transportation, and to simplify the device. SOLUTION: A particulate transport pipe is composed of an inner tube 2, and an outer tube 3, and is formed as a double tube structure having an inside passage 4 of the inner tube 2, and an outside passage 5 between the inner tube 2 and the outer tube 3, and has a connecting apparatus 6 of a double tube for transporting particulate in the inner tube 2. High pressure air G set higher than pressure in the inner tube 2 is supplied to the outside passage 5. A differential pressure control valve 7 of the high pressure air G is arranged in the outside passage 5 to generate differential pressure P1 -P2 in the adjacent outside passage 5.
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