| 摘要 |
Apparatus for acting on material to be conveyed in a material conveying channel, which apparatus comprises an impeding means (30), which can be arranged in the material conveying channel, which impeding means (30) can be moved between at least two positions, a first position, in which the impeding means (30) extends into the channel space (10) of the material conveying channel, and a second position, in which the impeding means does not essentially extend into the channel space of the material conveying channel. Means (31, 33) are arranged in connection with the impeding means (30), for conducting flowing medium, such as replacement air, from outside the material conveying channel into the channel space (10) of the material conveying channel to the point of, or into the vicinity of, the impeding means (30). |
