Covering net shape optimization method

Abstract

The invention relates to a covering net shape optimization method, which relates to masking fishing gear. A covering net adopts a net bag, a body net, an edge net, a bottom ring and a ring rope, wherein the net bag is in a conical shape, and the covering net is characterized in that the body net is in a cylindrical shape, the body net is formed by sewing a net opening section, an intermediate section and a net-bag connection section, the net opening section is connected to the edge net, and the net-bag connection section is connected with the net bag; a transverse straightened perimeter of a netting of each of the net opening section, the intermediate section and the net-bag connection section is identical, and the longitudinal straightened length ratio is 1: 1: 3; the size of each mesh of the net opening section is 140mm, the size of each mesh of the intermediate section is 70mm, and the size of each mesh of the net-bag connection section is 35mm; groups of bottom rings are respectively arranged at the lower edge of the edge net, at the junction between the net opening section and the intermediate section and at the junction between the intermediate section and the net-bag connection section, the distance between every two adjacent bottom rings of each group of bottom rings is 5m, the bottom rings arranged at the lower edge of the edge net are connected with the edge net by virtue of a cross rope, the bottom rings arranged at the junction between the net opening section and the intermediate section are fixed by virtue of a rope, the bottom rings arranged at the junction between the intermediate section and the net-bag connection section are fixed by virtue of a rope, and the ring rope is arranged in the middle of each group of bottom rings in a penetrating manner.

Description

technical field [0001] The present invention relates to cover fishing gear, especially cover nets. Background technique [0002] The cover net belongs to the cover type fishing gear. It covers the target catch from top to bottom, quickly settles through the lower line, and closes the net mouth to achieve the purpose of fishing. The operation is combined with light trapping, the operation is simple and convenient, the cost of the net gear is low, and the fishing method is energy-saving, so it is widely used in the fishing of pelagic fish in the ocean. At present, the mesh type of the cover mesh used in production is conical, the mesh cable material is monofilament, the sinker and the bottom ring are installed at the mesh opening, and the mesh size gradually decreases from the mesh opening to the mesh bag, but the mesh of each part of the entire top covering mesh The mesh size is not much different, the mesh size at the mesh port is about 35mm, and the mesh size at the mesh b...

AI Technical Summary

Problems solved by technology

Due to the limitations of the net type, the resistance of the net gear is large, and the subsidence speed of the lower class is slow, causing the target catch to sink and escape, which seriously affects the fishing efficiency. For fish schools with deep water layers, the fishing efficiency is poor

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