Sail type net mouth scissoring and assembling method

Abstract

The present invention is sail type standing net mouth shearing and assembling method and relates to marine fishing production. The present invention solves the technological problems of making reasonable net stress, reducing net damage and relaxing, increasing effective net water filtering area, and raising net operation efficiency and safety. The technological scheme includes net piece shearing and upper and lower headrope assembling; and features remaining certain amount of meshes on two sides of the net mouth, shearing towards the center in the slopes of 1-3, 1-5 and 1-7, and finally retaining 22 meshes in the center so as to horizontal mesh takeup in the length of 0.80 upper or lower headrope and upper and lower horizontal headrope coefficient of 0.2. the method of the present invention is suitable for sail type standing net for marine fishing production.

Description

Technical field: [0001] The invention relates to a net loading method for fixed stretching nets used in marine fishery production. Background technique [0002] The sail-type stretching net of the prior art is composed of an anchor, an anchor cable, a drag line, a fork line, a cross bar, an expanded canvas, a float, a floating ball, a sinker, an upper line, a lower line, a net body, and a mesh bag. The horizontal expansion of the net is maintained, and the float and sinker maintain the vertical expansion of the net. The net mouth is connected directly with the net at the junction of the upper class, lower class and expansion sail. Due to the action of the net in the water flow The upper line, lower line and expanded canvas at the mouth of the lower net are in the shape of a natural catenary, resulting in very uneven stress on the net on the catenary line. The smaller it is, the back and belly net in the middle of the catenary is in a relaxed state without stress. Due to th...

AI Technical Summary

Problems solved by technology

[0002] The sail-type stretching net of the prior art is composed of an anchor, an anchor cable, a drag line, a fork line, a cross bar, an expanded canvas, a float, a floating ball, a sinker, an upper line, a lower line, a net body, and a mesh bag. The horizontal expansion of the net is maintained, and the float and sinker maintain the vertical expansion of the net. The net mouth is connected directly to the net at the junction of the upper class, the lower class and the expansion sail. Due to the action of the net in the water flow The upper line, lower line and expanded canvas at the mouth of the lower net are in the shape of a natural catenary, resulting in very uneven stress on the net on the catenary line. The smaller it is, the back and abdomen net in the middle of the catenary is in a relaxed state without stress

Due to the concentrated force on the front part of the catenary, it is very easy to cause damage to this part of the net. Because the net on the abdomen is in a loose state, the net at this part is easy to be hooked by obstacles on the seabed. The net increases the line area of ​​the net, which restricts the normal opening of the mesh of the net, resulting in an increase in the resistance of the net, which is not good for safety and production.

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