CN87213473U - High-speed round-mouthed trawlnet - Google Patents

Abstract

The utility model provides a high-speed round-mouthed trawl net used for improving bottom trawling for a sea wheel fishing vessel. The utility model comprises a net mouth (1) which is similar to round after the net is opened, a wing (6), a half calabash-shaped net body (4) with a wide back, and the net body (4) mesh number which is formed via the variation of more than 20 times. At the time of the trawl net, as the utility model is provided with a triangle net coat (5), the problem that the net coat of a trawling net with a square mouth is heaped behind is solved; the half calabash-shaped net body (4) is thoroughly unfolded by parallel flow resistance; a net wing (6) is thoroughly unfolded in vertical range; the net mouth (1) is similar to a round, and is more than 5 meters higher than the ordinary net mouth by matching with suitable towing speed, horsepower and net cycle. The utility model is beneficial for releasing the young fishes in the base layer, which is suitable for the bottom trawling to fish in the East China Sea and the Yellow Sea.

Description

High-speed round-mouthed trawlnet

The utility model provides a kind of thin order round mouth fast bottom dredge that ocean wheel fishing boat bottom trawling is used that improves.

Otter-trawl is the important tool of production of existing various oceans wheel fishing boat.Concerning the economic fish of east, the Huanghai Sea, use existing square opening otter-trawl, large and small fish is fished for together, has destroyed the stock of fish and the ecological balance.Because its mesh is little, resistance is big, so the netting gear towing speed is slow; Its etting is uneven to launch, mesh is opened and closed inequality, causes stickleback easily or runs away, and cause that pulling out net weight, declines of fishery products quality, netting gear spoilage height, increase fishes for the phenomenon of operating labour intensity.In addition, as large and small yellow croaker, hairtail ... Deng east, Huanghai Sea economic fish perch water layer be along with round the clock, weather and sea situation change and change, general back before midday is the golden hour of use otter-trawl.When the shoal of fish perches the water layer come-up, have the square opening trawlnet now and limited by its height of net opening, the majority of catching is the immature assorted fish of near-bottom, more is unfavorable for the ecological balance and increases economic efficiency.Usually to adjust netting gear heavy power and buoyancy ratio or to shorten two towboat spacings and carry the win height of net opening, its shortcoming is that the height of net opening raising is limited, often vertically highly then dwindled transverse width because of improving it, always degree of expansion does not increase; Shorten the trawlnet spacing, whole trawlnet can not normally be launched, can not get Expected Results, increase energy loss.

The utility model provides a kind of thin order round mouth quick trawlnet, to improve height of net opening, alleviate towing tension, to increase and expand body oral area net and enclose, the etting balance is fully launched, mesh is opened to close evenly to reduce means such as gill net, to reach to increase and is caught big fish, reduces the juvenile fish ratio, pulls out that net is light, the fishery products quality rises, alleviate the purpose that netting gear damaged and fished for operation labour intensity.

Feature of the present utility model is by the back of the body, abdomen mouth door (2,3) two sides of netting triangle etting (5) to be housed, and makes to open the back like circular network interface (1); Be positioned at network interface (1) two side, about it, front and back are furnished with the Different Slope mesh gradient, and nearly most advanced and sophisticated place establishes the wing (6) of dovetail fork-shaped etting (7); Commonly used thin of back (8) netting twine and belly (9) is commonly used thick, and the wide back of the body semi-gourd shape body (4) that forms more than belly (9) of back (8) mesh number; And from network interface (1) between net capsule (10), increase afterwards through earlier subtract, dredge earlier the back close more than 20 times gradually the body of alternation (4) mesh number form.

Fig. 1 is a Copula net diagram of the present utility model.The back of the body, abdomen mouth door (2,3) two sides at net are equipped with triangle etting (5), are like circular after network interface (1) opens when making towing, solve the square opening net and tow out just distortion, the problem of piling behind the etting.Two side wings (6) up and down, front and back are furnished with the mesh gradient of Different Slope, and nearly most advanced and sophisticated place establishes dovetail fork-shaped etting (7), and wing (6) front end can fully be launched, and increases and expands the vertical web width of cloth, improves the height of network interface (1).Belly (9) mesh number is less than back (8) and forms wide back of the body semi-gourd shape body (4), it is thick that its belly (9) netting twine is used always, then commonly used thin in back (8), mesh number from network interface (1) to net capsule (10) be increase afterwards through earlier subtract, dredge earlier the back close more than 20 times gradually alternation form.Dredging the wide back of order (8) has increased that body encloses and elasticity, reduces stickleback or runs away; And the fine-structure mesh line of its composition makes etting alleviate towing tension, and helps raising network interface (1).Belly (9) coarse net line makes the contact benthic division reduce the etting wearing and tearing.

Fig. 2 is the utility model schematic diagram that is in operation.Etting is connected on the head rope rope when towing, and drags end operation by two ships (or single ship).Its net back of the body mouthful door (2) is gone up and is hung float (11), and net abdomen mouth door (3) is gone up and hung sinker (12).Because of the existence of triangle etting (5), heap problem behind the solution etting makes the fully expansion of semi-gourd shape body (4) of the wide back of the body under parallel resistance to water-flow influence when towing, and prevents small fish gill net phenomenon and alleviates towing tension.Two wings (6) are under dovetail fork-shaped etting (7) and the effect of the Different Slope mesh gradient, wing (6) fully launches on field amplitude, etting opens evenly, network interface (1) is like circular, its the height speed per hour 3 Where/hour, net all 80-90 centimetres/horsepower coupling down, raise more than 5 meters than square opening traw mouth.In addition suitable hangs the guiding principle rope and adjusts empty guiding principle, then can carry out the trawling of displacement, increase the activity duration and the space of trawlnet, like this end that east, the Huanghai Sea are fished for economic fish drag with the displacement bottom trawling in, both can discharge the bottom juvenile fish, the protection ecological balance; Can increase again and catch big fish, obtain good social and economic benefit.

Claims (1)

1, a kind ofly improves the quick trawlnet of round mouth that ocean wheel fishing boat bottom trawling is used, it is characterized in that triangle etting (5) being housed, make the network interface (1) that is after opening like circular by the back of the body, abdomen mouth door (2,3) two sides of net; Be positioned at network interface (1) two side, about it, front and back are furnished with the Different Slope mesh gradient, nearly most advanced and sophisticated place establishes the wing (6) of dovetail fork-shaped etting (7); Commonly used thin of back (8) netting twine and belly (9) is commonly used thick, and the wide back of the body semi-gourd shape body (4) that forms more than belly (9) of back (8) mesh number; And from network interface (1) between net capsule (10), increase afterwards through earlier subtract, dredge earlier the back close more than 20 times gradually the body of alternation (4) mesh number form.