| 摘要 |
Device for supporting and changing the nets closed into a pouch in aquaculture and fish-breeding. A structure making it possible to change immersed nets from the surface without the need of human underwater intervention. This device is made up of a hollow module (1) on which valves (8) (9) (10) (11) permit or do not permit the entry of water and/or of pressurised air inside the module (1), as well as two ballasted frames (6) (3) connected, on the one hand, to the module (1) and, on the other hand, to buoys (4) by means of cables (7) passing through the frame structure (3). When an immersed valve (8) is opened, the water entering inside the module (1) makes it list as far as equilibrium with air trapped in the module. The immersion as far as the vertical is controlled by immersed valves (11). The exchange of the nets is done by deploying one (5) and folding back the other (2). This change causes a reverse unbalancing of the whole. Pressurised air is blown in through the valve (10), which expels the water through the valves (8) and (9). The module gradually recovers its buoyancy having described an angle of 180 DEG and thus performed its inversion. <IMAGE> |
