CN111903625A - Bottom line of bottom trawl - Google Patents
Bottom line of bottom trawl Download PDFInfo
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- CN111903625A CN111903625A CN202010801529.9A CN202010801529A CN111903625A CN 111903625 A CN111903625 A CN 111903625A CN 202010801529 A CN202010801529 A CN 202010801529A CN 111903625 A CN111903625 A CN 111903625A
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- 238000005096 rolling process Methods 0.000 claims abstract description 105
- 241001233242 Lontra Species 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000000758 substrate Substances 0.000 description 4
- 238000010408 sweeping Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K73/00—Drawn nets
- A01K73/02—Trawling nets
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K73/00—Drawn nets
- A01K73/02—Trawling nets
- A01K73/04—Devices for spreading or positioning, e.g. control thereof
- A01K73/053—Ground-line rollers
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
Abstract
The invention relates to a bottom line of a bottom trawl, which is positioned at a lower net opening of a trawl body, wherein a plurality of first rolling support bodies are arranged at the arc top position in the middle of the bottom line, each first rolling support body comprises a first support ball capable of rotating around the arc top of the bottom line, a plurality of second rolling support bodies are arranged on straight line sections on two sides of the bottom line, each second rolling support body comprises a second support ball, the second support balls can rotate along a central axis perpendicular to the straight line sections on two sides of the bottom line, two ends of the bottom line are respectively connected with traction rolling support bodies, each traction rolling support body comprises a rotatable support roller, and the first rolling support bodies, the second rolling support bodies and the traction rolling support bodies are sinking structures which are weighted. The invention can ensure that the foot line completely falls to the bottom, and is beneficial to reducing the damage to the seabed bottom.
Description
Technical Field
The invention belongs to the technical field of trawling, and particularly relates to a bottom trawling net foot line.
Background
The trawl is a movable filtering fishing gear, and drags the bag-shaped fishing gear by means of the power of a fishing boat, so that marine organisms are dragged into the trawl in the passing water area, thereby achieving the purpose of fishing production. The bottom trawl is a net for trawling along the sea bottom, and the fishing objects are mainly benthic fishery organisms on the bottom layer.
The existing bottom trawl net foot line generally has the problem of large destructiveness to ocean substrate, the bottom of the net mouth of the bottom trawl net is provided with the sinker line, and the counterweight of the sinker line can seriously scratch the ocean substrate in the dragging process. The prior art also discloses a rolling type supporting structure arranged on a trawl foot line, for example, a utility model patent with application number 201621058986.9 discloses a rolling device of the trawl foot line, but a star-shaped gear plate is easy to catch meshes of a netting and cause winding in the rolling process; in addition, because the foot line is arc-shaped, when the plate surface of the star-shaped gear plates arranged at the two sides of the arc-shaped foot line is inconsistent with the advancing direction of the trawl in the dragging process, the star-shaped gear plates can not normally roll to scratch the marine substrate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bottom trawl foot line, which can ensure that the foot line falls completely and is beneficial to reducing the damage to seabed bottom materials.
The technical scheme adopted by the invention for solving the technical problem is to provide a bottom trawl foot line, the foot line is positioned at a lower net opening of a trawl net body (1), a plurality of first rolling support bodies are arranged at the arc top position in the middle of the foot line, each first rolling support body comprises a first support ball capable of rotating around the arc top of the foot line, a plurality of second rolling support bodies are arranged on straight line sections on two sides of the foot line, each second rolling support body comprises a second support ball capable of rotating along a central axis perpendicular to the straight line sections on two sides of the foot line, two ends of the foot line are respectively connected with a traction rolling support body, each traction rolling support body comprises a rotatable support roller, and the first rolling support body, the second rolling support body and the traction rolling support bodies are sinking structures through weights.
The first rolling support body further comprises a central shaft and connecting rings, the first support balls are rotatably sleeved on the central shaft along the radial direction, the connecting rings are arranged at two ends of the central shaft respectively, the base line is connected with the connecting rings, and the connecting rings of the adjacent first rolling support bodies are connected through connecting buckles.
The first rolling support body further comprises a hollow columnar limiting sleeve which is sleeved and fixed on the base line, the first support balls are radially and rotatably sleeved on the base line, and the plurality of first support balls are distributed at intervals and are limited between the adjacent first support balls through the limiting sleeve.
The second rolling support body further comprises an annular outer frame, a supporting rotating shaft and connecting lugs, the two opposite sides of the second supporting ball are rotatably supported inside the annular outer frame along the radial direction through the supporting rotating shaft, the connecting lugs are respectively fixed on the two opposite sides of the annular outer frame, the opposite direction of the connecting lugs is perpendicular to the opposite direction of the supporting rotating shaft, and the foot line is connected with the connecting lugs.
The second rolling support body further comprises a hollow cylindrical fixed sleeve and a 7-shaped first support frame, the fixed sleeve is fixedly sleeved on the straight line sections on two sides of the foot line, the second support ball is arranged below the fixed sleeve, two sides of the second support ball are respectively connected with the fixed sleeve through the first support frames which are symmetrically arranged, and two sides of the second support ball are radially and rotatably supported on the first support frames on two sides.
The second rolling support body further comprises a hollow cylindrical fixing sleeve and a T-shaped second support frame, three second support balls are uniformly distributed on the outer side of the fixing sleeve at intervals along the circumferential direction of the fixing sleeve, the second support frames are arranged between the adjacent second support balls respectively, the second support frames are fixed on the fixing sleeve, two sides of each second support ball are radially and rotatably supported on the adjacent second support frames, and the fixing sleeve is fixedly sleeved on the straight line sections on two sides of the foot line.
Pull roll supporter still including chamfer rectangle frame, support center pivot and connection earrings, it is equipped with protruding muscle along the even interval of circumference on cylindric and the outer periphery to support the roller whole, support the roller and rotationally support inside the frame through the support center pivot respectively along the relative both ends of center pin direction, the intermediate position that the relative both sides of frame correspond is fixed with the connection earrings, the relative direction that sets up of connection earrings and the relative direction mutually perpendicular that sets up of support center pivot, the base line tip is connected with one side connection earrings, and opposite side connection earrings passes through the hand rule and is connected with the otter board.
The connecting ear ring connected with the end part of the foot line can also be arranged at a position which is arranged at one side of the outer frame facing to the foot line and is deviated from the middle position, and when the traction rolling support body is dragged and rolled, the inner side end of the outer frame is inclined forwards towards the advancing direction of the bottom trawl.
The supporting roller can also be arranged into a frustum shape integrally, convex ribs are uniformly arranged on the outer circumferential surface at intervals along the circumferential direction, and the inner side end of the supporting roller has a larger radial size.
Advantageous effects
Firstly, in the invention, the base line of the bottom trawl is reasonably configured and designed through the first rolling support body, the second rolling support body and the traction rolling support body respectively, so that the base line forms an approximately triangular sinking structure on the whole, and the use of the traditional sinker line is avoided. On one hand, the complete bottom falling of the bottom line can be ensured, the stability of the shape of the bottom line can be kept in the dragging process, and the fishing effect of the bottom trawl is ensured; on the other hand, the first rolling support body, the second rolling support body and the traction rolling support body can play a supporting role on the base line, most line sections of the base line do not need to be balanced, the damage of the base line to the seabed bottom substance in the operation process can be effectively reduced, and the structural design of the first rolling support body, the second rolling support body and the traction rolling support body can furthest reduce the damage to the seabed bottom substance in the rotation process.
Secondly, the invention also provides an embodiment of the 'extroversion type' traction rolling support body, and the traction rolling support body has the effect of pulling the trawl net outwards in the process of dragging and moving, so that on one hand, the effect of quickly pulling the width of the net mouth of the trawl net can be achieved when the bottom trawl net is thrown in, on the other hand, the width of the bottom line can be expanded, and the effect of increasing the sea sweeping area of the net mouth of the bottom trawl net can be achieved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a first embodiment of the first rolling support.
Fig. 3 is a schematic structural view of a second embodiment of the first rolling support.
Fig. 4 is a schematic structural view of a first embodiment of the second rolling support.
Fig. 5 is a schematic structural view of a second embodiment of the second rolling support.
Fig. 6 is a schematic structural view of a third embodiment of the second rolling support.
Fig. 7 is a schematic structural view of a first embodiment of the traction rolling support.
Fig. 8 is a schematic structural view of a second embodiment of the traction rolling support.
Fig. 9 is a schematic structural view of a third embodiment of the traction rolling support.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in figure 1, the bottom line 3 of the bottom trawl is positioned at the lower net opening of a trawl body 1, and the upper net opening of the trawl body 1 is provided with a floating line 2.
A plurality of first rolling supporting bodies 4 are installed at the arc top position in the middle of the base line 3, and the number of the first rolling supporting bodies 4 can be adjusted according to the radian of the base line 3 and the requirement of balance weight. The first rolling support body 4 comprises a first support ball 4-1 which can rotate around the arc top of the bottom line 3 and is used for supporting the arc top position of the bottom line 3.
A plurality of second rolling supporting bodies 5 are installed on the straight line sections on two sides of the foot line 3 at intervals, and the number of the second rolling supporting bodies 5 can be adjusted according to the requirement of balance weight. The second rolling support body 5 comprises a second support ball 5-1, and the second support ball 5-1 can rotate along a central axis perpendicular to straight line sections on two sides of the base line 3 and is used for supporting the straight line sections on two sides of the base line 3.
Two ends of the foot line 3 are respectively connected with a traction rolling support body 6, and the traction rolling support body 6 is connected with the net plate through the foot line. The traction rolling support 6 comprises rotatable support rollers 6-1 able to support the ends of the base line 3.
The first rolling support body 4, the second rolling support body 5 and the traction rolling support body 6 are sinking structures designed through reasonable balance weights, so that the base line 3 of the trawl can completely fall, the base line 3 integrally forms a sinking structure similar to a triangle, and the stability of the shape of the base line 3 is favorably kept in the dragging process. It should be noted that the expression "the outline 3 falls completely" does not mean that the outline 3 directly contacts and scratches the seabed sediment; on the contrary, the first rolling support body 4, the second rolling support body 5 and the traction rolling support body 6 can play a supporting role on the foot line 3, most line sections of the foot line 3 do not need to be weighted, a certain lifting force can be generated under the action of water flow during operation to keep a suspended state close to the bottom, and the damage of the foot line to the seabed bottom in the operation process can be effectively reduced.
Fig. 2 shows a specific embodiment of the first rolling support 4. The first rolling support body 4 includes a first support ball 4-1, a central shaft 4-2, and a connection ring 4-3. The first supporting ball 4-1 is rotatably sleeved on the central shaft 4-2 along the radial direction, and two ends of the central shaft 4-2 are respectively provided with a connecting ring 4-3. The adjacent first rolling support bodies 4 are connected with the adjacent connecting rings 4-3 through connecting buckles 4-4 to realize series connection, and the whole formed by the first rolling support bodies 4 and the connecting buckles 4-4 is connected with the base line 3 through the connecting rings 4-3 at two ends. Under the structure, the arc top position of the base line 3 is directly replaced by a chain structure consisting of the first rolling supporting body 4 and the connecting buckles 4-4.
Fig. 3 shows another embodiment of the first rolling support 4. The first rolling support body 4 comprises a first support ball 4-1 and a hollow cylindrical stop collar 4-5 sleeved and fixed on the base line 3. The first supporting balls 4-1 are rotatably sleeved on the base line 3 along the radial direction, the first supporting balls 4-1 are distributed at intervals at the arc top position of the base line 3, and the adjacent first supporting balls 4-1 are limited by the limiting sleeves 4-5.
Fig. 4 shows a specific embodiment of the second rolling support 5. The second rolling support body 5 comprises a second support ball 5-1, an annular outer frame 5-2, a support rotating shaft 5-3 and a connecting lug 5-4. Opposite sides of the second supporting ball 5-1 are rotatably supported inside the annular outer frame 5-2 through the supporting rotating shaft 5-3 in a radial direction, and the bottom of the second supporting ball 5-1 is lower than the bottom surface of the annular outer frame 5-2. The opposite two sides of the annular outer frame 5-2 are respectively fixed with a connecting lug 5-4, and the opposite direction of the connecting lugs 5-4 is vertical to the opposite direction of the supporting rotating shaft 5-3. The second rolling support bodies 5 are connected to the straight line sections on the two sides of the base line 3 at intervals, the base line 3 is connected with the connecting lugs 5-4, and the adjacent second rolling support bodies 5 are also connected through the base line 3.
Fig. 5 shows another embodiment of the second rolling support 5. The second rolling support body 5 comprises a second support ball 5-1, a hollow cylindrical fixed sleeve 5-5 and a first support frame 5-6 in the shape of a "7". The fixing sleeve 5-5 is fixedly sleeved on the straight line sections on two sides of the foot line 3, the second supporting ball 5-1 is arranged below the fixing sleeve 5-5, two sides of the second supporting ball 5-1 are respectively connected with the fixing sleeve 5-5 through the first supporting frames 5-6 which are symmetrically arranged, two sides of the second supporting ball 5-1 are radially and rotatably supported at one end of the first supporting frames 5-6 on two sides, and the other end of the first supporting frame 5-6 is fixedly connected with the fixing sleeve 5-5. The second rolling support body 5 with the structure can be directly sleeved on the base line 3 through the fixing sleeves 5-5, so that the requirement of connecting multiple sections of base lines is avoided.
Fig. 6 shows another embodiment of the second rolling support 5. The second rolling support body 5 comprises a second support ball 5-1, a hollow cylindrical fixed sleeve 5-5 and a second support frame 5-7 in the shape of a "T". The three second supporting balls 5-1 are uniformly distributed at intervals on the outer side of the fixed sleeve 5-5 along the circumferential direction of the fixed sleeve 5-5, and second supporting frames 5-7 are respectively arranged between the adjacent second supporting balls 5-1. The inner end of the second supporting frame 5-7 is fixed on the fixed sleeve 5-5, two opposite ends at the outer side are respectively connected with the adjacent second supporting ball 5-1 by a shaft, and two sides of the second supporting ball 5-1 are rotatablely supported on the adjacent second supporting frame 5-7 along the radial direction. The second rolling support body 5 is fixedly sleeved on the straight line sections on the two sides of the foot line 3 through the fixing sleeves 5-5, so that the condition that multiple sections of foot lines need to be connected is avoided. In this structure of the second rolling support body 5, the second support balls 5-1 are distributed in a regular triangle around the outline 3, and can support the outline 3 well even when the outline 3 is twisted during the work.
Fig. 7 shows a concrete structure of the traction rolling support 6. The traction rolling support body 6 comprises a support roller 6-1, a chamfer and rectangular outer frame 6-2, a support central rotating shaft 6-3 and a connecting earring 6-4. The supporting roller 6-1 is integrally cylindrical, and the outer circumferential surface is uniformly provided with the convex ribs 6-5 at intervals along the circumferential direction, so that the adhesive force between the supporting roller and the seabed substrate is improved, and the ground grabbing effect is improved. Opposite ends of the support rollers 6-1 in the direction of the central axis are rotatably supported inside the outer frame 6-2 by support center rotating shafts 6-3, respectively. The connecting earrings 6-4 are fixed in the middle positions corresponding to the two opposite sides of the outer frame 6-2, and the opposite arrangement directions of the connecting earrings 6-4 are vertical to the opposite arrangement direction of the supporting central rotating shaft 6-3. The end part of the foot line 3 is connected with one side of the connecting earring 6-4, and the other side of the connecting earring 6-4 is connected with the net plate through the foot line. Through reasonable counterweight design, the front end of the foot line 3 of the bottom trawl net falls to the bottom by utilizing the traction rolling support body 6.
Fig. 8 shows another embodiment of the traction rolling support 6, similar to that of fig. 7, with the difference that the connecting earrings 6-4 connected to the ends of the outline 3 are arranged at positions outside the middle position on the side of the frame 6-2 facing the outline 3. The structural design ensures that the inner side end of the outer frame 6-2 inclines forwards towards the advancing direction of the bottom trawl when the traction rolling support body 6 is dragged and rolls, so as to form an outwards-inclining type traction rolling support body 6 structure, the effect of pulling the trawl outwards in the operation process is achieved, the effect of quickly pulling the width of the trawl opening when the bottom trawl is thrown in can be achieved, meanwhile, the width of the foot line can be expanded, and the effect of increasing the sea sweeping area of the trawl opening is achieved.
Fig. 9 shows another embodiment of the traction rolling support 6, which is similar to the structure of fig. 7, except that the support rollers 6-1 are arranged in a frustum-shaped structure as a whole, and the outer circumferential surface is provided with ribs 6-5 at uniform intervals along the circumferential direction, and the inner ends of the support rollers 6-1 have a larger radial dimension. Through the structural design of the supporting roller 6-1 with frustum-shaped inclination, a 'camber type' traction rolling supporting body 6 structure is formed, the effect of pulling the trawl net outwards in the operation process is achieved, the effect of rapidly pulling the width of the trawl net opening when the bottom trawl net is put in can be achieved, meanwhile, the width of the foot line can be expanded, and the effect of increasing the sea sweeping area of the trawl net opening is achieved.
Claims (9)
1. The utility model provides a bottom trawl foot line, this foot line (3) are located trawl net body (1) lower net gape, its characterized in that: a plurality of first rolling supporting bodies (4) are arranged at the arc top position in the middle of the base line (3), the first rolling supporting body (4) comprises a first supporting ball (4-1) which can rotate around the arc top of the foot line (3), a plurality of second rolling supporting bodies (5) are arranged on the straight line sections at the two sides of the base line (3), the second rolling support body (5) comprises a second support ball (5-1), the second support ball (5-1) can rotate along a central axis perpendicular to straight line sections on two sides of the bottom line (3), two ends of the foot line (3) are respectively connected with a traction rolling supporting body (6), the traction rolling support body (6) comprises a rotatable support roller (6-1), the first rolling support body (4), the second rolling support body (5) and the traction rolling support body (6) are sinking structures which pass through counter weights.
2. The bottom trawl outline according to claim 1, wherein: the first rolling support body (4) further comprises a central shaft (4-2) and connecting rings (4-3), the first support balls (4-1) are radially and rotatably sleeved on the central shaft (4-2), the connecting rings (4-3) are respectively arranged at two ends of the central shaft (4-2), the foot lines (3) are connected with the connecting rings (4-3), and the connecting rings (4-3) of adjacent first rolling support bodies (4) are connected through connecting buckles (4-4).
3. The bottom trawl outline according to claim 1, wherein: the first rolling support body (4) further comprises a hollow cylindrical limiting sleeve (4-5) sleeved and fixed on the base line (3), the first support balls (4-1) are radially and rotatably sleeved on the base line (3), the plurality of first support balls (4-1) are distributed at intervals, and the adjacent first support balls (4-1) are limited through the limiting sleeve (4-5).
4. The bottom trawl outline according to claim 1, wherein: the second rolling support body (5) further comprises an annular outer frame (5-2), a support rotating shaft (5-3) and connecting lugs (5-4), two opposite sides of the second support ball (5-1) are rotatably supported inside the annular outer frame (5-2) through the support rotating shaft (5-3) along the radial direction, the connecting lugs (5-4) are respectively fixed on two opposite sides of the annular outer frame (5-2), the opposite direction of the connecting lugs (5-4) is perpendicular to the opposite direction of the support rotating shaft (5-3), and the foot line (3) is connected with the connecting lugs (5-4).
5. The bottom trawl outline according to claim 1, wherein: the second rolling support body (5) further comprises a hollow cylindrical fixing sleeve (5-5) and a 7-shaped first support frame (5-6), the fixing sleeve (5-5) is fixedly sleeved on straight line sections on two sides of the foot line (3), the second support ball (5-1) is arranged below the fixing sleeve (5-5), two sides of the second support ball (5-1) are connected with the fixing sleeve (5-5) through the symmetrically arranged first support frames (5-6), and two sides of the second support ball (5-1) are radially and rotatably supported on the first support frames (5-6) on two sides.
6. The bottom trawl outline according to claim 1, wherein: the second rolling support body (5) further comprises a hollow cylindrical fixing sleeve (5-5) and a T-shaped second support frame (5-7), three second support balls (5-1) are evenly distributed on the outer side of the fixing sleeve (5-5) at intervals along the circumferential direction of the fixing sleeve (5-5), the second support frames (5-7) are respectively arranged between the adjacent second support balls (5-1), the second support frames (5-7) are fixed on the fixing sleeve (5-5), two sides of each second support ball (5-1) are rotatably supported on the adjacent second support frames (5-7) along the radial direction, and the fixing sleeve (5-5) is fixedly sleeved on the straight line sections on two sides of the bottom (3).
7. The bottom trawl outline according to claim 1, wherein: the traction rolling support body (6) further comprises a chamfered rectangular outer frame (6-2), a supporting center rotating shaft (6-3) and connecting earrings (6-4), the supporting roller (6-1) is integrally cylindrical, convex ribs (6-5) are uniformly arranged on the outer circumferential surface at intervals along the circumferential direction, two opposite ends of the supporting roller (6-1) along the direction of a central shaft are rotatably supported inside the outer frame (6-2) through the supporting center rotating shaft (6-3), the connecting earrings (6-4) are fixed at the corresponding middle positions of two opposite sides of the outer frame (6-2), the opposite directions of the connecting earrings (6-4) are perpendicular to the opposite directions of the supporting center rotating shaft (6-3), the end part of the foot line (3) is connected with the connecting earrings (6-4) at one side, the other side is connected with an earring (6-4) which is connected with the otter board through the foot line.
8. The bottom trawl outline of claim 7, wherein: the connecting earrings (6-4) connected with the end parts of the foot lines (3) can also be arranged at the positions of one sides of the outer frames (6-2) facing the foot lines (3) which are deviated from the middle positions, and when the traction rolling support bodies (6) are dragged and rolled, the inner side ends of the outer frames (6-2) are inclined forwards towards the advancing direction of the bottom trawl.
9. The bottom trawl outline of claim 7, wherein: the supporting roller (6-1) can also be arranged into a frustum shape integrally, convex ribs (6-5) are uniformly arranged on the outer circumferential surface at intervals along the circumferential direction, and the inner side end of the supporting roller (6-1) has a larger radial size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801529.9A CN111903625A (en) | 2020-08-11 | 2020-08-11 | Bottom line of bottom trawl |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801529.9A CN111903625A (en) | 2020-08-11 | 2020-08-11 | Bottom line of bottom trawl |
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| CN111903625A true CN111903625A (en) | 2020-11-10 |
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| CN202010801529.9A Pending CN111903625A (en) | 2020-08-11 | 2020-08-11 | Bottom line of bottom trawl |
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| CN106472439A (en) * | 2016-09-18 | 2017-03-08 | 中国水产科学研究院东海水产研究所 | A kind of wear-resistant trawlnet bottom line manufacture method |
| CN209185451U (en) * | 2018-11-28 | 2019-08-02 | 湖南鑫海股份有限公司 | A kind of trawlnet ground rope mechanism |
| WO2020129093A2 (en) * | 2018-12-21 | 2020-06-25 | Reval Seafood | Conical roller |
| CN213153556U (en) * | 2020-08-11 | 2021-05-11 | 中国水产科学研究院东海水产研究所 | Bottom line of bottom trawl |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR614708A (en) * | 1925-08-31 | 1926-12-21 | Device or system of roller or bevel wheel fluted by straight or helical fins horizontally spreading the opening of fishing trawls | |
| US3250035A (en) * | 1963-10-29 | 1966-05-10 | Frank J Luketa | Trawl bobbin and chafing apron assembly |
| FR1388432A (en) * | 1964-04-07 | 1965-02-05 | Donso Natfabrik | Device of spherical rollers connected to the lower line of the mouth of a trawl |
| FR2480079A1 (en) * | 1980-04-15 | 1981-10-16 | Coleman Et Fils | Oceangoing trawl net ballasting roll - has rollers on axis perpendicular to haulage direction turning in frame |
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