CN2671338Y

CN2671338Y - Double boat surface and middle layer rope trawl

Info

Publication number: CN2671338Y
Application number: CN 200320122910
Authority: CN
Inventors: 王明彦; 郁岳峰; 付荫慤; 徐宝生
Original assignee: East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
Current assignee: East China Sea Fishery Research Institute Chinese Academy of Fishery Sciences
Priority date: 2003-12-29
Filing date: 2003-12-29
Publication date: 2005-01-19
Anticipated expiration: 2013-12-29

Abstract

The utility model relates to a double boat surface and middle layer rope trawl. The technical problem to be solved is to provide a double boat surface and middle layer rope trawl which can decrease the water resistance of a trawl and raise the fishing efficiency of the trawl. The utility model is composed of a trawl cuff, a trawl body, a trawl bag and accessories. The utility model is characterized in that the trawl cuff and the first section of the trawl body are rope structures. Meshes on the front part of the second section of the trawl body adopts a form of two meshes being assembled into one mesh to be respectively connected with ropes which are led form an upper outline, a lower outline and a side outline. The ropes used for being connected with the meshes of the trawl body are evenly assembled according to the spacing of the ends of the trawl cuff and the spacing of the end parts of the side trawl. The ratio of the spacing of the ends of the trawl cuff and the length of the upper outline is 0.55-0.60, and the ratio of the spacing of the end parts of the side trawl and the length of the side outline is 0.45-0.47. The utility model is suitable for the double boat surface and middle layer rope trawl of offshore fishery.

Description

Double boat surface, middle level rope trawlnet

Technical field:

The utility model relates to the used double boat surface of inshore fishing, middle layer trawl.

Background technology

Existing used double boat surface, the middle layer trawl of inshore fishing is called floating trawl again, and its structure is similar substantially to the coastal waters otter-trawl, all is to adopt several sections different rhombus order net sheet and the rete cords of mesh size to sew up, be assembled.Before middle nineteen nineties in last century, generally between 10cm～40cm, after this, mesh size progressively amplifies the mesh size at traw mouth place, and the mesh size of network interface part is generally 8～9m now, and maximum mesh can reach 12m.Yet in certain fishing boat towing tension scope, table, the middle layer trawl sewing up, be assembled by the net sheet, its netting gear scale and always be subjected to certain restriction with the line area, can't further reduce trawl resistance, enlarge trawlnet sweep that amass on the sea and the catching rate of raising trawlnet.

The utility model content

The utility model technical issues that need to address provide a kind of double boat surface, middle level rope trawlnet that the sea is long-pending, improve trawlnet fishery harvesting efficient of sweeping that helps reducing trawlnet water resistance, expansion netting gear scale, increases trawlnet.

The technical solution of the utility model is made of wing, body, net capsule and accessory, and wing and first section body adopt rope structure, and all the other bodies are identical with conventional trawlnet with the net capsule, is sewed up by etting and rete cord to be assembled; The mesh of second section front portion of body adopts two orders to piece together an order form to join with the rope that draws from headline, infraclass and side guiding principle respectively, and the rope that connects the body mesh on average assembles by the spacing of sleeve end spacing and side net end; The sleeve end spacing of trawlnet and headline length ratio 0.55～0.60, the spacing of side net end and side guiding principle length ratio 0.45～0.47.

The utility model is owing to adopt rope structure at wing and first section body; and preferred trawlnet sleeve end spacing and headline length ratio, side net tip spacing and side guiding principle length ratio; not only make trawlnet have the water resistance of reducing; enlarge the netting gear scale; amass on the sea of sweeping that increases trawlnet; improve the technique effect of trawlnet fishery harvesting efficient, also have the technique effect of protection economic fish juvenile fish resource.

Description of drawings

Fig. 1 represents the schematic diagram of double boat surface, middle level rope trawlnet duty;

Fig. 2 represents the network interface back of the body of the present utility model, belly bilge construction schematic diagram;

Fig. 3 represents network interface side wet end structural representation of the present utility model.

Embodiment

Implement concrete mode of the present utility model below in conjunction with description of drawings:

The utility model is made of wing 1, body 2, net capsule 3 and accessory 4, and body 2 adopts the four-piece type structure of upper and lower symmetry, and the anterior catalogue number of body is about 5: 2 with the ratio of body back, belly, sidepiece mesh order number; Wing 1 and first section body 5 adopt rope structure, and all the other bodies are identical with conventional trawlnet with the net capsule; In order to reduce rope quantity, the mesh of second section front portion of body adopts two orders to piece together a purpose form to join with the rope that draws from upper and lower guiding principle and side guiding principle; Connect the spacing mean allocation of the rope of body mesh by sleeve end spacing and side net end; Simultaneously, in order to prevent that fishing for object escapes from both sides, knit several large meshes again at the body sidepiece and be connected with the rope that draws from the side guiding principle; The two ends spacing of wing and headline length ratio 0.55～0.60, the spacing at side net two ends and side guiding principle length ratio 0.45～0.47.

With the employed trawlnet of 198.45kw fishing boat is example, its upper and lower guiding principle length is 95.6m, and the netting gear total length is 143.37m, the about 485m of net gap perimeter, wing length 36.3m, body length 96.95m, net capsule length 10.12m, the catalogue number of second section front portion of body is 56 orders, wherein, the back of the body, belly part respectively are 18 orders, and the left and right side mesh portions is 10 orders respectively, and mesh size is 8m; According to wing 1 and first section network interface (seeing Fig. 2, Fig. 3) that body 5 assembles for rope structure, headline, infraclass and left and right side guiding principle are connected with body with six roots of sensation rope with ten ropes respectively by the edge guiding principle, it is the public rete cord that the back of the body, abdomen combine with sidepiece and locate that four ropes are wherein arranged, the polypropylene rope that upper and lower edge guiding principle is diameter 14mm, the public rope PEF kernmantle of diameter 14mm, all the other ropes are the PEF kernmantle of diameter 8mm, and Zhuan Pei netting gear is 142.33m with the line area always like this ², with conventional trawlnet 163.31m ²Compare, always reduce relatively with the line area, have the trawlnet of reducing water resistance, enlarge the netting gear scale, amass on the sea of sweeping that increases trawlnet, improves the technique effect of trawlnet fishery harvesting efficient.

Claims

1. double boat surface, middle level rope trawlnet are made of wing, body, net capsule and accessory, it is characterized in that wing and first section body adopt rope structure, the mesh of second section front portion of body adopts two orders to piece together an order form to join with the rope that draws from headline, infraclass and side guiding principle respectively, and the rope that connects the body mesh on average assembles by the spacing of sleeve end spacing and side net end; The sleeve end spacing of trawlnet and headline length ratio 0.55～0.60, the spacing of side net end and side guiding principle length ratio 0.45～0.47.

2. double boat surface according to claim 1, middle level rope trawlnet is characterized in that being composed of large mesh at the body sidepiece is connected with the rope that draws from the side guiding principle.