Small-span-chord-ratio rectangular double cambered-surface middle-layer net plate and floating- gravitational force adjusting method thereof

Abstract

The invention relates to a small-span-chord-ratio rectangular double cambered-surface net plate and a floating-gravitational force adjusting method of the net plate. The net plate comprises a main panel, the two sides of the panel are of hollow structures, the inner side and the outer side of the main panel are arc-shaped curved surfaces, the curvature of the arc-shaped curved surface on the inner side is larger than that of the arc-shaped curved surface on the outer side, an upper deflector is installed at the top of the main panel, a lower deflector is installed at the bottom of the main panel, a warp reinforcing plate is installed in the middle, and a warp support is installed on the warp reinforcing plate and connected with the main panel through reinforcing ribs on the two sides. Cross rope connecting holes are formed in the upper deflector and the lower deflector, a floating force plate is installed below the upper deflector in a detachable connection mode, a balancing weight plate is installed above the lower deflector in a detachable connection mode, a bottom-pull baffle is installed below the lower deflector in a detachable connection mode, the front end of the bottom-pull baffle is arc-shaped, and a reinforcing rib plate is arranged in an upturned arc shape at the front end of the bottom-pull baffle. The main panel provides floating force, achieves floating-gravitational force adjusting in a detachable mode and is suitable for trawling in different water layers.

Description

technical field [0001] The invention belongs to the technical field of marine fishery fishing tools, and in particular relates to a small-aspect-ratio rectangular double-arc surface-middle layer net plate and a method for adjusting the floating and sinking force thereof. Background technique [0002] A trawl is a mobile filtering fishing gear. The net plate is the main attachment in single-vessel trawling, and its main function is to realize the horizontal expansion of the net during the fishing boat's towing process. When trawling in the middle water body and the bottom, the mesh plate also acts as a net settler to realize the vertical expansion of the net. 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. High-performance stencils should have the following characteristics: large expansion force and low re...

AI Technical Summary

Problems solved by technology

When operating in various water layers, such as bottom trawling, middle trawling, and surface trawling, there are different requirements for the mesh panels, and mesh panels with different buoyancy and sinking force ratios are required. However, a fishing boat cannot be equipped with multiple mesh panels. will limit the operating range of fishing boats

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