| 摘要 |
The present invention relates to a pneumatic transport device particularly for seed drills. The device comprises an inlet tube 10 into which the seeds are introduced one by one, an annular passage 13 of convergent form for air under pressure at the periphery of the end of the inlet tube 10 and a cylindrical passage 14 whose end is connected to the pneumatic transport tube 17 and, according to the invention and downstream and at a small distance from the neck of the annular passage 13 of convergent form, at least one opening 18 communicating between the cylindrical passage 14 and the atmosphere. The invention is applicable particularly to a seed drill comprising a central distributor which feeds a large number of ploughshares. |
