To prevent a seal member from being pushed out by pressurization in a suction force feed vehicle or a suction force feed device that sucks and discharges a recovering object using negative pressure and pressurization.
The seal structure of a discharge gate 5 for the suction force feed vehicle or the suction force feed device includes a receiver tank 3 for sucking and discharging a sucking object using negative pressure and pressurization, and the discharge gate 5 for opening and closing an opening part of the receiver tank 3. The seal structure further includes a first recessed groove 43 formed in the discharge gate 5, a second recessed groove 44 formed narrower than the first recessed groove 43 in the first recessed groove 43, and a packing 46 comprising a base part 47 fitted in the second recessed groove 44 and a head part 46 connected to the base part 47 and formed wider than the base part 47 and narrower than the first recessed groove 43.
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Takashi Kuboyama
Mikio Hotta
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