CN2798586Y

CN2798586Y - Screen plate for expanding dragnet sleeve and mouth

Info

Publication number: CN2798586Y
Application number: CN 200520043202
Authority: CN
Inventors: 王明彦; 张勋; 郁岳峰; 徐宝生; 王锦浩
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: 2005-07-06
Filing date: 2005-07-06
Publication date: 2006-07-26
Anticipated expiration: 2015-07-06

Abstract

The utility model relates to a screen plate for expanding a dragnet sleeve and a mouth, particularly a screen plate for a dragnet and the problem needing to be solved is to enhance the expanding performance of the screen plate. The technical scheme of the utility model is composed of an upper faceplate, an upper reinforcing rib, a top cover of the screen plate, a drag rope plate, a lower faceplate, a lower reinforcing plate, a front drag iron, a middle drag iron, a back dray iron and a triangular frame. The utility model is characterized in that one flow attacking side of the screen plate forms a drag-back angle from middle part to both ends; the upper and the lower faceplates of the screen plate are connected in an obtuse angle, and the included angle of the faces of the plates is 156DEG; the curvature of the curved surface of the screen plate is 14 percent, and the aspect ratio is 1.60; an included angle between the dray irons and the lower face plate of the screen plate is 105DEG. The utility model is used for single-boat dragnet fishing.

Description

The web plate of expansion trawlnet wing and network interface

Technical field:

The utility model relates in the single boat trawl operation web plate that expansion trawlnet wing and network interface are used.

Background technology

Trawl board is connected between fishing boat and the trawlnet fishing gear, utilizes the lateral spread power that is produced in its towing process under water to guarantee that wing and network interface effectively launch, thereby reaches the effect of fishing.Therefore, the quality of web plate performance is directly connected to the fishery harvesting efficient of trawlnet.China's single boat trawl fishery web plate commonly used has four kinds of rectangle plane web plate, V-arrangement web plate, ellipse double leaf aperture plate plate and vertical airfoil web plates.Rectangular otter board is the web plate that uses the earliest, because it is simple in structure, cheap, easy to operate, therefore, still is widely used in China's ocean shrimp trawlnet and jib trawl-net fishing so far, and still, its hydrodynamic performance is relatively poor; The V-arrangement web plate was come out the fifties in last century, this web plate by panel, add the Strong muscle, drag iron, segmental support forms, because its simple in structure, easily manufactured, good stability, therefore, this web plate of the most uses of the small-sized single boat trawl fishery of China, its major defect is that spreading performance is poor, and is similar to the rectangle plane web plate basically; Ellipse double leaf aperture plate plate is the most frequently used web plate of the former Soviet Union, China is mainly used in 294～441 kilowatts of trawler, this web plate has good stable, and spreading performance also is better than rectangle plane web plate and V-arrangement web plate, but cost height, maintenance trouble, from great; Vertical airfoil web plate is called bottom high aspect ratio rectangle curved surface web plate again, be widely used in domestic and international large and medium-sized single hull bottom trawl-net fishing, its great advantage is that the spreading performance of web plate is apparently higher than aforementioned three kinds of web plates, but, its structure more complicated, cost be higher, when using in seabed inferior, less stable.

The utility model content

The utility model technical issues that need to address are to improve the spreading performance and the stability of web plate.

The technical solution of the utility model by top panel, on add Strong muscle, web plate top cover, warp plate, lower panel, lower reinforcing plate, front drawn iron, middle drawn iron, back drawn iron, tripod and form, it is characterized in that stream one side of meeting of web plate is made 10 ° of receding angles by the middle part to two ends; Web plate upper and lower plates face links to each other in obtuse angle, and plate face angle is 156 °; The curvature of web plate curved surface is 14%, and aspect ratio is 1.60.

The utility model is owing to designed best plate face knuckle and aspect ratio, make web plate obtain best hydrodynamic characterisitic in working order, experimental results show that when the angle of attack is 20 °, lift coefficient reaches 1.55, resistance coefficient is 0.57, lift-drag ratio is 2.72, and the dilatancy of web plate, stability all significantly are better than existing four kinds of otter-trawl plates.

Description of drawings

Fig. 1 represents structural representation of the present utility model;

Fig. 2 represents vertical section of the present utility model schematic diagram;

Fig. 3 represents the structural representation of the utility model in the warp plate position.

Embodiment

Implement best way of the present utility model below in conjunction with description of drawings:

See accompanying drawing 1 and accompanying drawing 3, the utility model adopt top panel 1, on add Strong muscle 2, warp plate 3, lower panel 4, web plate top cover 5, lower reinforcing plate 6, front drawn iron 7, middle drawn iron 8, back drawn iron 9, tripod 10 and form full steel structure V-type curved surface web plates; It is rectangular-shaped that the web plate peripheral outline becomes substantially, and the leading edge of web plate and trailing edge all weld round steel and strengthen; The web plate top connects the web plate top cover, and the web plate top cover is welded to form by steel plate frame and round steel; Web plate bottom dress drags iron, bottom to drag iron to be welded to form by multilayer steel plates; The periphery at the web plate back side and middle part weldering reinforcing plate are beneficial to improve the bulk strength of web plate; Web plate upper and lower plates junction is established the triangle stand and is rotated tripod; Web plate is met stream one side and is made 10 ° of receding angles by the middle part respectively to two ends, is beneficial to improve the hydrodynamic performance of web plate; Web plate upper and lower plates face is 156 ° of obtuse angles and links to each other (seeing accompanying drawing 2), to keep the stability of web plate under in working order; The web plate plate curvature of face is 14%, and the aspect ratio of web plate is 1.60; It is 105 ° that web plate drags the angle between iron and lower panel.This web plate dilatancy, stability all significantly are better than existing four kinds of otter-trawl plates, can keep advantages of higher stability in the towing process, even lodging also can recover normal condition rapidly in the seabed.

Claims

The web plate of expansion trawlnet wing and network interface by top panel, on add Strong muscle, web plate top cover, warp plate, lower panel, lower reinforcing plate, front drawn iron, middle drawn iron, back drawn iron, tripod and form, it is characterized in that meeting of web plate flow a side and make 10 ° of receding angles by the middle part to two ends; Web plate upper and lower plates face links to each other in obtuse angle, and plate face angle is 156 °; The curvature of web plate curved surface is 14%, and aspect ratio is 1.60.
2. the web plate of expansion trawlnet wing according to claim 1 and network interface is characterized in that it is 105 ° that web plate drags the angle between iron and lower panel.