CN201243557Y - Symmetrical type folding trawlnet selectivity device - Google Patents
Symmetrical type folding trawlnet selectivity device Download PDFInfo
- Publication number
- CN201243557Y CN201243557Y CNU2008201510656U CN200820151065U CN201243557Y CN 201243557 Y CN201243557 Y CN 201243557Y CN U2008201510656 U CNU2008201510656 U CN U2008201510656U CN 200820151065 U CN200820151065 U CN 200820151065U CN 201243557 Y CN201243557 Y CN 201243557Y
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- frame
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- fish
- framework
- selectivity device
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Abstract
The utility model discloses a symmetric folding type fish net selectivity device relating to a fish net selectivity device and aims at providing a fish net selectivity device having the advantages of good selectivity effect, simple and convenient operation, small influence on water power of a net, and no fishing effect reduction. The technical scheme is as follows: the fish net selectivity device comprises rigid frames and grids and is characterized by comprising three frames A, B and C of equivalent width; the structures of the three frames A, B and C are symmetric; the frame A and the frame B, and the frame B and the frame C are respectively connected by hinges; and the direction of the grids in the frames is vertical to the combination side of the hinges. In order to guarantee that the work state of the planes of the frames A and C and the frame B is in an included angle of 45 DEG, the middle points on both sides of the frames A and C are welded with two earrings, and the earrings at the corresponding side of the frames A and C are connected by ropes. The utility model is used for a fish net releasing off-target fish seeds, and the body width of the fish seeds is smaller than the spacing of the grids.
Description
Technical field:
The utility model relates to fish trawlnet selectivity device.
Background technology
Fish trawlnet selectivity device is made up of framework and grid, is used for the wide non-target fingerling less than grid distance of releaser.Fish trawlnet selectivity device is loaded on fish trawlnet capsule head wet end position (a joint etting of net capsule front portion), in device the place ahead funnel type is housed and leads fishnet.Fish trawlnet selectivity device has rigidity and flexible two kinds of forms.Rigidity selectivity device is made circle or oval frame by stainless steel or aluminium alloy or rigid plastics or glass fibre, is furnished with grid again; Flexible selectivity device is that rubber, PE netting twine are made.Rigidity selectivity device is fixed in the net capsule, can not fold inconvenient operation, in addition, the escape mouth that foreign material such as rubbish are easy to below device is assembled, and stops up grid, the selectivity effect is reduced, the hydrodynamic performance of netting gear is also had certain negative influence, cause the fishery harvesting effect to reduce.Though flexible selectivity device is easy to operate, easy deformation can't be escaped non-target fingerling, causes the separation effect of this class selectivity device to reduce.
The utility model content
The problem that the utility model need solve provides a kind of effective, easy and simple to handle, little to the hydrodynamic force influence of netting gear, as not reduce fishery harvesting effect fish trawlnet selectivity device of selecting.
The technical solution of the utility model is made up of rigid frame and grid, it is characterized in that this device is made of A, B, three wide sashes of C, A, B, C three sash both sides symmetrical configuration, and A links to each other with hinge respectively with the C framework with B, B; It is vertical that grid direction in the framework and hinge combine the limit; For assurance A, C framework and B frame plane duty are 45 ° of angles, two earrings of middle means of spot welds on A, C framework both sides, A, C frame corresponding sides earrings link to each other with rope.
The utility model is compared with former selective device has effective, the advantages of simple operation of selection; Integrated water dynamic effect to netting gear is little, can discharge non-target fingerlings such as juvenile fish, shrimp under the prerequisite that does not reduce the fishery harvesting effect.
Description of drawings
Fig. 1 represents structural representation of the present utility model.
Fig. 2 represents is end view under the utility model duty.
Embodiment
The utility model is formed (see figure 1) by the rigidity sash of A, B, three parts of C, A, B, C three sashes are wide, the B frame that is in the towing plane is square, sash both sides symmetrical configuration, A links to each other with 2～3 360 ° of hinges respectively with the C framework with B, B, grid direction in the framework be hinged that to combine the limit vertical, be in the A portion framework near net capsule one side and install etting additional; For guaranteeing that A, C framework and B frame plane duty are 45 ° of angles, promptly weld two earrings E in 1/2 L1,1/2 L3 place at A, C framework both sides point midway respectively, the earrings E of A, the C framework corresponding sides continuous (see figure 2) of rope S; For the etting of fitting better, do (see figure 1) in the arc-shaped at A, C frame roof 1/3 L1,1/3 L3 place respectively.
The utility model is determined the key dimension of device according to the specification of capsule head net.For example the L2 size is decided to be 1/7～1/6 of capsule head net length, and the B framework is in capsule head net vertical direction middle part, therefore can obtain the L4 size according to its horizontal expansion situation, and L1, L3 can calculate according to taper ratio and 45 ° of angles.According to the wide definite grid distance d of the body of the non-target fingerling that will discharge,, do not influence normal fishery harvesting simultaneously to guarantee the wide fingerling of releaser less than spacing.The etting netting twine specification that installs additional in the A frame is identical with the net capsule with mesh size, and hanging ratio is 0.45 (hanging ratio is meant the ratio of sewing up back netting-length and etting taut length).
Claims (3)
1, the collapsible fish trawlnet of a kind of symmetric form selectivity device is made up of rigid frame and grid, it is characterized in that this device is made of A, B, three wide sashes of C, A, B, C three sash both sides symmetrical configuration, and A links to each other with hinge respectively with the C framework with B, B; It is vertical that grid direction in the framework and hinge combine the limit; For assurance A, C framework and B frame plane duty are 45 ° of angles, two earrings of middle means of spot welds on A, C framework both sides, A, C frame corresponding sides earrings link to each other with rope.
2, the collapsible fish trawlnet of a kind of symmetric form according to claim 1 selectivity device is characterized in that installing etting additional in the A portion framework.
3, the collapsible fish trawlnet of a kind of symmetric form according to claim 1 and 2 selectivity device is characterized in that A, C frame roof 1/3L1,1/3L3 place do in the arc-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201510656U CN201243557Y (en) | 2008-07-21 | 2008-07-21 | Symmetrical type folding trawlnet selectivity device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201510656U CN201243557Y (en) | 2008-07-21 | 2008-07-21 | Symmetrical type folding trawlnet selectivity device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201243557Y true CN201243557Y (en) | 2009-05-27 |
Family
ID=40727371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201510656U Expired - Fee Related CN201243557Y (en) | 2008-07-21 | 2008-07-21 | Symmetrical type folding trawlnet selectivity device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201243557Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104904681A (en) * | 2015-06-01 | 2015-09-16 | 中国水产科学研究院东海水产研究所 | Multi-window series connection combination type trachurus murphyi trawling selectivity device |
| CN111869633A (en) * | 2020-05-25 | 2020-11-03 | 浙江海洋大学 | Rotary multi-net-bag trawl |
-
2008
- 2008-07-21 CN CNU2008201510656U patent/CN201243557Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104904681A (en) * | 2015-06-01 | 2015-09-16 | 中国水产科学研究院东海水产研究所 | Multi-window series connection combination type trachurus murphyi trawling selectivity device |
| CN111869633A (en) * | 2020-05-25 | 2020-11-03 | 浙江海洋大学 | Rotary multi-net-bag trawl |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20140721 |
|
| EXPY | Termination of patent right or utility model |