Net mouth structure with concentrated sinking force counterweight for net mouth self-expanding Antarctic krill trawl net

Abstract

The invention relates to a net mouth structure with a concentrated sinking force counterweight for a net mouth self-expanding Antarctic krill trawl net. The net mouth structure comprises a net tool, wherein the net tool comprises a truss rod, an upper edge line, a lower edge line, a side line, a cover net, a side wing net and a body net, the truss rod is 18-20 meters long, a diameter of the trussrod is between 250 and 300 mm, the truss rod expands the net mouth horizontally, two sides of an abdominal net at the front end of a net mouth of the body net are respectively provided with sinking forces, and the component forces of the sinking forces are transmitted through the side line and suture edge, so that the lower edge line is in a forced and tensioned state; a unilateral sinking force weight is 4 tons, a force point of the lower edge line forms an included angle of about 2.1 degrees with a vertical line of the back and abdomen, and thereby 500 kg of lateral tension can be produced on the lower edge line; the net mouth of the body net and the side line form an included angle of 36.0 degrees, and thereby 2900 kg of forward extension can be produced; and the body net comprises a back net, a side net and the abdominal net, cutting slopes of the back net and the side net are 2-1, and cutting slopes of the abdominal net along the length direction of the first section of the body net to the third section of the body net are 3-1, 3-1 and 3-1 respectively.

Description

technical field [0001] The invention relates to a trawl gear for marine fishery, especially a trawl gear for fishing Antarctic krill. Background technique [0002] Since Antarctic krill resources were commercially exploited in the 1980s, although various operation methods such as trawling, purse seine and seine trawling have been tried, after years of production practice, only trawling fishing operation method has been retained at present. [0003] According to the expansion method of Antarctic krill trawling fishing gear, there are mainly two types: one is to maintain the horizontal expansion of the net gear through the trawl net plate; the other is to maintain the level of the net gear through the truss rod at the front end of the net mouth expansion. The net plate trawling fishing operation method, because the net plate needs to be stable under certain dynamic conditions, so the acquisition of each catch needs to be realized through a complete process of setting the net,...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low fishing efficiency and unstable operation performance of Antarctic krill trawling in the prior art

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