High-aspect-ratio double-cambered-surface trawl otter board and buoyancy-sinking force ratio adjusting method thereof

Abstract

The invention relates to a high-aspect-ratio double-cambered-surface trawl otter board and a buoyancy-sinking force ratio adjusting method of the trawl otter board. A main panel is of a vertical double-cambered-surface structure, the cross section is in a double-circular-arc shape and hollow inside, an upper top plate is installed at the top of the main panel, a lower top plate is installed at the bottom of the main panel, a middle reinforcing plate is installed in the middle of the main panel, and reinforcing ribbed plates are installed between the upper top plate and the middle reinforcing plate and between the middle reinforcing plate and the lower top plate respectively. The inner space is separated into four watertight spaces, a guide plate is installed on the front side of the main panel, a steel warp connecting frame is installed at one end, close to the front side, of the middle reinforcing plate, one cross rope connecting frame is installed at the position, close to the top, on the rear side of the installed upper top plate, cross rope connecting frames are installed at the positions, close to the upper top plate and the lower top plate, of the rear end respectively, and a pressureproof valve is installed in each watertight space on the rear side. The buoyancy-sinking force ratio of the otter board is adjusted rapidly, hydrodynamic performance of an original structure of the otter board is not changed, flexible adjustment is achieved for trawling in different water layers, when the buoyancy-sinking force ratio is adjusted, the centre-of-gravity position can be kept low, and the otter board has good stability.

Description

technical field [0001] The invention belongs to the technical field of marine fishery fishing tools, and in particular relates to a large-aspect-ratio double-arc trawl net plate and a method for adjusting the floating-sinking ratio thereof. Background technique [0002] The trawling net plate is the main attachment to realize the expansion of the net gear during the towing process of the trawler. At present, the types of mesh panels commonly used in trawl fishery include rectangle, oval, vertical surface type, vertical surface "V" shape, rectangular double-slit surface type, compound wing type mesh panels, etc. According to the material, it can be divided into wood, steel and steel-wood mixed structure mesh panels. The common method of adjusting and controlling the net position during trawling operations is to adjust the length of the trawl and the speed of the trawl, and to move the stencil to move up or down The vertical component force, adjust the water layer. When car...

AI Technical Summary

Problems solved by technology

However, limited by the structure and weight of the stencil itself, the adjustment range of this adjustment method is limited, not only the operation is more complicated, but also the stability of the stencil will decrease.

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