| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform stirring without generating trouble even if a water level is varied. SOLUTION: A vertical aeration device 100 is constituted of a vertical shaft 1, the stirring blades 2 attached to the leading end of the vertical shaft 1, the stirring blade rotating motor 3 rotating the vertical shaft 1 and a stirring blade up-and-down moving part 101 for moving the stirring blades 2 up and down. In the stirring blade up-and-down moving part 101, an up-and down control part 6a and a ball screw rotating motor 6 rotate a ball screw 5 corresponding to the water level of water W to be treated, that is, the water level detection signal D sent from a water level meter to move the stirring blades 2. By this constitution, even if a water level is varied, aeration stirring can be sufficiently performed.</p> |
