CN2819792Y

CN2819792Y - Parallel shrimp trawl net

Info

Publication number: CN2819792Y
Application number: CN 200520044565
Authority: CN
Inventors: 张勋; 郁岳峰; 徐宝生; 王明彦
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: 2005-08-26
Filing date: 2005-08-26
Publication date: 2006-09-27
Anticipated expiration: 2015-08-26

Abstract

The utility model relates to a parallel shrimp trawl, particularly a single-boat shrimp trawl which needs to solve the technical problem of a shrimp catching net for a single trawler. The technical scheme of the utility model comprises nets and a net board. The utility model is characterized in that two nets with same specifications are connected together in parallel by a skid, the sheepshank coefficients of an upper middle rope and a lower middle rope of each net are both within the range of 0.5-0.7, the proportion of the length of a wing net and the perimeter of a net mouth is 22%-30%, the proportion of the length of a body net and the perimeter of the net mouth is 36%-40%, the proportion of the length of a raise net and the perimeter of the net mouth is 6%-10%, the proportion of floating and sinking force is 30%-80%; the rectangular planar net board with the aspect ratio of 0.41 is slid and prized into a triangular frame shape, the bottom of the net board is welded with pull iron, the front part of the net board is connected with a drag rope fixing seat and the back part of the triangular frame is welded with an upper and a lower cross rope boards. The utility model is suitable for shrimp catching fishing tackles.

Description

Parallel shrimp trawlnet

Technical field:

The utility model relates to single ship shrimp trawlnet.

Background technology

At present, China shrimp trawl-net fishing mainly adopts boom shrimp trawlnet and two kinds of operating types of single ship web plate shrimp trawlnet.Shrimp trawlnet netting gear is made of upper and lower sleeve net, square, back of the body net, belly, side net, keed.Boom shrimp trawlnet must rely on thick, heavy boom to keep the horizontal expansion of network interface, and labour intensity is big, poor stability, when the operation of high sea weather, the time have human casualty accident to take place, be not suitable for carrying out fishing operation in the profundal zone, off-lying sea; Secondly, belly etting and seabed friction are bigger, and the accident of scoring a goal is many; And netting gear size of mesh is too small, and in operation process, double juvenile fish and the juvenile prawn that catches economic fish is unfavorable for protecting the economic fish resource easily; Simultaneously, net resistance is bigger, the coefficient of energy dissipation height, and catching rate is lower.Web plate shrimp trawlnet installing web plate is as the netting gear extension fixture; web plate adopts the rectangle plane web plate; made by deal board, and wrap iron plate in the framework periphery, iron is dragged in the welding of web plate bottom; web plate shrimp trawling mode has characteristics easy and simple to handle, that safety is good; fishery harvesting efficient is higher than boom shrimp trawlnet, and still, the horizontal expansion performance of netting gear is still good inadequately; and easily mix and catch other economic fish, be unfavorable for protecting the fish resources.

The utility model content

The utility model technical issues that need to address are shrimping netting gears that a kind of efficient, low energy consumption is provided for 110～441 kilowatts of single trawlers.

The technical solution of the utility model comprises net and web plate, it is characterized in that adopting skid that the net of two top same specifications is connected in parallel, the upward middle guiding principle of every top net, down middle guiding principle hanging ratio are all in 0.5～0.7 scope, sleeve net length and net gap perimeter ratio are in 22%～30% scope, body net length and net gap perimeter ratio are in 36%～40% scope, square length and net gap perimeter ratio are in 6%～10% scope, and the force rate of drifting along example is in 30%～80% scope; Web plate employing aspect ratio is 0.41 rectangle plane web plate; Skid is made the tripod shape by steel unit, and drags iron, tripod front portion to be connected with in the bottom welding and drag the guiding principle fixing base, and the welding of tripod rear portion is two fork guiding principle plates up and down.

Experimental results show that the horizontal expansion of parallel shrimp trawlnet increases by 5% than boom trawlnet, sweep that the sea is long-pending to increase by 189%, coefficient of energy dissipation can reduce by 65%, has the advantage that horizontal expansion is big, coefficient of energy dissipation is low, fishery harvesting efficient is high, is a kind of energy-conservation, shrimping fishing gear efficiently.

Description of drawings

Fig. 1 represents is the connection diagram of shrimp trawlnet and web plate, skid.

What Fig. 2 represented is the structural representation of skid.

Embodiment

The utility model comprises netting gear and web plate 2 (Fig. 1), adopt skid 3 (Fig. 1) that the net of two top same specifications is connected in parallel, among Fig. 11 drags guiding principle, the 4th, upper leg, the 5th, following empty guiding principle, the 6th, headline, the 7th, ground rope, every top net is by the laterally zygomorphic back of the body, belly 8,9 (Fig. 1) and symmetrical side net 10 (Fig. 1) constitute, the ratio of the net gap perimeter of single top net and the net gap perimeter of common single ship shrimp trawlnet is 0.707, the upward middle guiding principle hanging ratio scope of catamaran type shrimp trawlnet in parallel is 0.5～0.7, last wing adopts three section type to cut out, guiding principle hanging ratio scope is 0.5～0.7 down, following wing adopts two-period form to cut out, sleeve net length and net gap perimeter proportion are 22%～30%, body net length and net gap perimeter proportion are 36%～40%, square length and net gap perimeter proportion are 6%～10%, and the force rate of drifting along example scope is 30%～80%; Web plate 2 (Fig. 1) adopts common rectangle plane web plate, and this web plate is made by deal board, peripheral iron clad plate, and dragging iron, the aspect ratio of web plate in the welding of web plate bottom is 0.41, and the lift coefficient of web plate is 0.82, and resistance coefficient is 0.72; Skid (seeing 3 and Fig. 2 of Fig. 1) is made by steel unit and steel plate, tripod is made by steel unit 2 (Fig. 2), welding brace reinforcement 5 (Fig. 2) in the middle of the tripod, and drag iron 6 (Fig. 2) in bottom welding, quality and web plate the uniform quality in water of skid in water, the tripod front portion is connected with drags the guiding principle fixing base, drag the guiding principle fixing base to drag the affixed point 1 of guiding principle (Fig. 2) consistent with the height that web plate drags the affixed point of guiding principle, the welding of tripod rear portion is two fork guiding principle plate 3,4 (Fig. 2) up and down.

The shrimp trawlnet that is equipped with 294 kilowatts of fishing boats is an example below, the net gap perimeter of single ship shrimp trawlnet is 78 meters, catamaran type shrimp traw mouth girth in parallel can adopt 55 meters, 60 millimeters of size of meshes, guiding principle hanging ratio 0.5 in going up, down middle guiding principle hanging ratio 0.52, last wing adopted 1: 1,2: 3,1: 3 three section type cuts out that (the minimum brief ratio of the N-meshes of cutting edge and T-meshes is called taper ratio, and representation is: N-meshes: T-meshes), 39.8 meters of headline length, following wing adopted 1: 1, and two-period form was cut out in 2: 3,49 meters of infraclass length, 15 meters of wing length, wing length is 27.2 with the ratio of net gap perimeter, 4.95 meters of square length, and square length is 9% with the ratio of net gap perimeter, 21.4 meters of body net length, body net length is 38.9% with the ratio of net gap perimeter; Buoyancy is provided as 90 kilograms, and heavy power is provided as 150 kilograms, drifts along than being 60%; The web plate area is 2 square metres, 2200 millimeters of web plate chord-lengths, and long 900 millimeters of the span, aspect ratio 0.41, quality is 164 kilograms in the web plate water; 1900 millimeters of skid length, 1050 millimeters of height, 40 millimeters of steel unit diameters, quality is 164 kilograms in the skid water.Web plate is connected with fishing boat by draging guiding principle with skid, and an end of web plate and netting gear is connected with empty guiding principle, and the other end of netting gear is connected on the skid by empty guiding principle, and two top nets become parallel form.

Claims

1. parallel shrimp trawlnet, comprise net and web plate, it is characterized in that adopting skid that the net of two top same specifications is connected in parallel, the upward middle guiding principle of every top net, down middle guiding principle hanging ratio are all in 0.5～0.7 scope, sleeve net length and net gap perimeter ratio are in 22%～30% scope, body net length and net gap perimeter ratio are in 36%～40% scope, and square length and net gap perimeter ratio are in 6%～10% scope, and the force rate of drifting along example is in 30%～80% scope; Web plate employing aspect ratio is 0.41 rectangle plane web plate; Skid is made the tripod shape by steel unit, and drags iron, tripod front portion to be connected with in the bottom welding and drag the guiding principle fixing base, and the welding of tripod rear portion is two fork guiding principle plates up and down.

2. parallel shrimp trawlnet according to claim 1 is characterized in that 55 meters of net gap perimeters, 60 millimeters of size of meshes, guiding principle hanging ratio 0.5 in going up, down middle guiding principle hanging ratio 0.52, last wing becomes 1: 1,2: 3, three section type was cut out in 1: 3,39.8 meters of headline length, following wing becomes 1: 1, and two-period form was cut out in 2: 3,49 meters of infraclass length, 15 meters of wing length, 4.95 meters of square length, 21.4 meters of body net length, buoyancy is provided as 90 kilograms, and heavy power is provided as 150 kilograms.

3. parallel shrimp trawlnet according to claim 1 and 2 is characterized in that the web plate area is 2 square metres, 2200 millimeters of web plate chord-lengths, and long 900 millimeters of the span, quality is 164 kilograms in the web plate water.

4. parallel shrimp trawlnet according to claim 1 and 2 is characterized in that 1900 millimeters of skid length, 1050 millimeters of height, and 40 millimeters of steel unit diameters, quality is 164 kilograms in the skid water.