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A method for preventing torsion during trawl net body operation

A net body and trawling technology, applied in fishing nets, animal husbandry, applications, etc., can solve the problems of affecting yield, causing twisting, preventing the smooth entry of the catch into the bag net, etc., and achieving the effect of avoiding twisting of the net body.

Active Publication Date: 2018-11-23
EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The longer and longer net body brings a problem, that is, the back of the trawl net and the bag net will be twisted when being towed, which will hinder the smooth entry of fish into the bag net and affect the yield

Method used

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  • A method for preventing torsion during trawl net body operation
  • A method for preventing torsion during trawl net body operation
  • A method for preventing torsion during trawl net body operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: The calculation formula for controlling the length of the trawl net body is L≈0.3.C.a -0.17 , in which: L—the length of the trawl net body, m; C—the tensioned circumference of the mesh mouth, m; a—the half-mesh size of the mesh mouth, m; the back end of the mesh bag is conical, and the back end of the mesh bag is assembled Equivalent to the float 2 of 1% buoyancy of net gear resistance, iron chains 1 with equal sinking force are assembled on both sides of the net bag, so that the net bag does not twist and open under the buoyancy and sinking force.

Embodiment 2

[0011] Embodiment 2: according to the mode of embodiment 1, be 500m with the net port tightening perimeter C, the net port mesh size 2a is 6m, and the large mesh trawl net that the resistance of the net gear is 40kN during operation is an example: the length of the net body L≈0.3.C.a -0.17 ≈0.3×500×3 -0.17 ≈125m; the mesh capsule is composed of two rectangular mesh pieces ( figure 1 ), the single sheet specification is 110 mesh × 200 mesh, the cutting slope of the first 150 mesh of the mesh bag is 15-1, and the cutting slope of the last 50 mesh is 4-1 ( figure 2 ), after cutting, two pieces of mesh are sewn into a mesh bag ( image 3 ).

Embodiment 3

[0012] Embodiment 3: according to the mode of embodiment 1, the float assembled on the rear end back of the mesh bag starts from the longitudinal midpoint of the back of the mesh bag to the center of the back 50 mesh away from the bottom end and assembles four engineering plastics double-eared spherical floats with a diameter of 280mm , a total buoyancy of about 400N is generated. Iron chains with a diameter of 10mm are installed on both sides of the mesh bag where the float is installed. The total weight in the air is 46kg, which can generate a sinking force of about 400N in water.

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Abstract

The invention discloses a method for preventing a trawlnet body from generating twisting during operation of a trawlnet, and relates to design of the trawlnet and a keed. The method is characterized by comprising the following steps of controlling the length L of the trawlnet body to be about 0.3.C.a<-0.17>, wherein L is the length (m) of the trawlnet body; C is circumference (m) of a net opening when the net is tightened; a is half-mesh size (m) of meshes of the net opening; the rear end of the keed is conical, a buoyance float which is equivalent to 1% of resistance of the net is arranged at the back of the rear end of the keed, and iron chains with equal sinking force are arranged on two side surfaces of the keed, so that the keed does not generate twisting under the action of the buoyance and the sinking force, and is opened. The method disclosed by the invention is suitable for trawlnets with different specifications and sizes.

Description

technical field [0001] The present invention relates to trawl design and bag net. Background technique [0002] Trawl fishing gear relies on fishing boats to tow the net gear to advance in the water, forcing the fishing gear to pass through the fish, shrimp and other fishing objects in the water to enter the fishing gear to achieve the purpose of fishing. The fishing output of trawl fishing gear accounts for about 40% of my country's marine fishing output, and is the main force of my country's marine fishery. [0003] At present, the winged single-capsule trawl consisting of two net wings, a net body and a single net bag is the main type of wheeled trawl in my country. With the severe decline of fishery resources in the world, the specifications of trawl nets are getting larger and larger, and the mesh size of the mesh mouth is also super large. The mesh size of bottom trawls in my country's coastal waters can reach up to 12m. The 6m mesh trawl has been widely used. Espec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K73/02
CPCA01K73/02
Inventor 周爱忠郁岳峰
Owner EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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