Upright grid type net plate

Abstract

The invention relates to an upright grid type net plate which comprises an upper flow guide plate, a plurality of wing plates with large span-chord ratios, steel warp reinforcement plates and a lower flow guide plate. The upright grid type net plate is characterized in that the wing plates with the large span-chord ratios are arranged between the upper flow guide plate and the lower flow guide plate, the upper ends and the lower ends of the wing plates with the large span-chord ratios are connected with the upper flow guide plate and the lower flow guide plate along angles of wedges at the front end of the upper flow guide plate and the front end of the lower flow guide plate, are equidistantly rearwards arrayed and are parallel to one another, the steel warp reinforcement plates are arranged between the upper flow guide plate and the lower flow guide plate and are connected and combined with the various wing plates to form a net plate body which is of a structure with a small span-chord ratio, and the upright grid type net plate is integrally in a grid form. The upright grid type net plate has the advantages that merits of low induced drag and high lift-drag ratios of the wing plates with the large span-chord ratios can be sufficiently played, and the upright grid type net plate is applicable to fishing boats with different gross tons and operation on water of different water layers and is high in water power efficiency.

Description

technical field [0001] The invention belongs to the technical field of marine fishery fishing tools, and in particular relates to an upright grid grid plate. Background technique [0002] The net plate is an important attachment in single-vessel trawling, and its main function is to realize the horizontal expansion of the net. For trawls in different water layers, the mesh panel also acts as a net settler or realizes the vertical expansion of the net. At present, the types of mesh plates used more in the world trawl fishery include rectangle, ellipse, V-shape, vertical (large aspect ratio), vertical curved V-shape, slat type, etc. The working principle of the stencil is similar to that of the wing, and the aspect ratio has a significant impact on the working efficiency of the stencil. When a large aspect ratio is used, the flow around the two ends of the screen is reduced, the induced resistance of the screen is reduced, the lift-drag ratio is improved, and the expansion e...

AI Technical Summary

Problems solved by technology

For small and medium-sized fishing trawlers, limited by the ship's drag force, deck operating area, and net gear specifications, etc., generally use small aspect ratio mesh panels, such as rectangular, V-shaped mesh panels, etc. The hydrodynamic force of such mesh panels The efficiency is low, and a large amount of eddy currents are generated behind the back of the mesh, thereby increasing the drag resistance of the mesh plate and reducing the expansion force of the mesh plate. Fog, forming trails, greatly destroys the habitat of marine life

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