CN111903627B - Quick-descending vertical trawl for investigation of biological resources in Antarctic sea area and use method - Google Patents
Quick-descending vertical trawl for investigation of biological resources in Antarctic sea area and use method Download PDFInfo
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- CN111903627B CN111903627B CN202010836265.0A CN202010836265A CN111903627B CN 111903627 B CN111903627 B CN 111903627B CN 202010836265 A CN202010836265 A CN 202010836265A CN 111903627 B CN111903627 B CN 111903627B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000011835 investigation Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000004804 winding Methods 0.000 claims description 13
- 238000011160 research Methods 0.000 claims description 7
- 239000013535 sea water Substances 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000239366 Euphausiacea Species 0.000 description 1
- 239000012472 biological sample Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- A01K80/00—Harvesting oysters, mussels, sponges or the like
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D44/00—Harvesting of underwater plants, e.g. harvesting of seaweed
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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
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- Life Sciences & Earth Sciences (AREA)
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- Biodiversity & Conservation Biology (AREA)
- Marine Sciences & Fisheries (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The application relates to a quick-descending vertical trawl for investigation of biological resources in a south pole sea area and a use method thereof. The application can realize the folding, the storage, the transportation and the throwing of the vertical trawl, is beneficial to improving the descending speed of throwing the trawl into the water body, effectively avoids the occurrence of the overturning condition and is convenient for sampling.
Description
Technical Field
The application belongs to the technical field of marine organism capturing and sampling nets, and particularly relates to a quick-descending vertical trawl for investigation of biological resources in the Antarctic sea area and a use method thereof.
Background
Marine plankton comprises plankton and phytoplankton, plankton research is an important way for researching subjects such as marine biological resources, marine environment, fishery ecology, fish biology and the like, sampling of plankton varies from tens of meters to hundreds of meters in depth according to sea area conditions, particularly in the investigation of biological resources such as antarctic krill and the like in antarctic sea areas, the depth of biological sampling can reach more than 200 meters, and sampling sites usually need tens or even hundreds, so that the workload is huge.
The current plankton sampling technology commonly used is to utilize a funnel-shaped vertical trawl, utilize a wire rope winch to put the vertical trawl to a certain depth, and then pull the trawl up for sampling. The diameter of the net mouth of the vertical trawl is generally about 1m, and the steel pipe circle is adopted to connect the net mouth for fixing the shape. Under this kind of structure, the net gape size is too big then should not carry, increases the operation degree of difficulty simultaneously, and net gape size restriction has also influenced biological acquisition efficiency. When the vertical trawl is lowered, the net mouth is generally parallel to the water surface, the water flow is slightly inclined, the lowering resistance is larger, the lowering speed is influenced, the sampling time is prolonged, and the workload is increased. In addition, the steel pipe circle supports the net mouth, and the collection container is connected to the lower part, and when the stormy waves are great or the velocity of flow is great, the condition that bottom collection container turns over and gets into the net mouth can appear, leads to can't accomplish sampling work.
Disclosure of Invention
The application aims to solve the technical problem of providing a quick-descending vertical trawl for investigation of biological resources in the south-pole sea area and a use method thereof, which can realize the folding, storage, transportation and throwing of the vertical trawl, are beneficial to improving the descending speed of throwing the trawl into a water body, effectively avoid the occurrence of a capsizing condition and facilitate sampling.
The application provides a quick-descending vertical trawl for investigation of biological resources in a south pole sea area, which comprises a winding and unwinding line, a net mouth line, supporting rods, a central support, a net cover, a connecting platform and a collecting barrel, wherein the lower end of the winding and unwinding line is connected with the central support, the central support is radially provided with a plurality of supporting rods along the circumferential direction, the inner ends of the supporting rods are rotatably connected with the central support, the bottoms of the supporting rods and the central support form a limit support in the horizontal direction when the supporting rods rotate downwards to a horizontal position, the net mouth line adopts an elastic line and is connected with the outer ends of the circumferential supporting rods, the upper end of the net cover is connected with the net mouth line, the lower end of the net cover is connected with the connecting platform, the upper end of the collecting barrel is in a funnel shape when the net cover is unfolded, and the upper end of the collecting barrel is connected with the connecting platform through a quick detachable structure.
When the vertical trawl is in a suspension state or in a descending state in seawater and the support rods rotate upwards until the net openings are folded, the net openings are kept folded by the pretightening force of the net opening side lines; when the vertical trawl is in an upward lifting state in the sea, the support rods are rotated downwards to a horizontal position under the action of water resistance, so that the net openings are unfolded.
The center supports are radially provided with a plurality of support rod clamping grooves along the circumferential direction, two sides of each support rod clamping groove are respectively provided with a parallel clamping groove plate, the bottom of each support rod clamping groove is provided with a vertical rotation limiting groove, the outer side of each vertical rotation limiting groove is provided with a horizontal support limiting boss, the inner side end of each support rod is inserted into each support rod clamping groove and is rotatably connected with the clamping groove plates on the two sides, and when the support rods rotate downwards to a horizontal position, the support rods are supported to form limiting through the horizontal support limiting bosses, and when the support rods rotate upwards to a limiting position, the support rods are limited through the limiting ends on the outer sides of the vertical rotation limiting grooves.
The safety rope is connected between the central support and the collecting barrel, and the safety rope is detachably connected with the collecting barrel.
The central position of the central support passes through the central support and is sleeved with a connecting piece, the upper end of the connecting piece is provided with an upper connecting ring, the lower end of the connecting piece is provided with a lower connecting ring, the lower end of the winding and unwinding rope is connected with the upper connecting ring, and the upper end of the safety rope is connected with the lower connecting ring.
The connecting platform is circumferentially provided with a bottom line connecting hole, the bottom end of the net is connected with the bottom line, and the bottom line is connected with the connecting platform through the bottom line connecting hole.
The connecting platform comprises a connecting ring, a plurality of rotary clamping grooves are formed in the connecting ring along the circumferential direction, supporting clamping beams corresponding to the rotary clamping grooves are arranged at the top of the collecting barrel, and the supporting clamping beams are inserted into the rotary clamping grooves and are connected and detached through relative rotation between the connecting platform and the collecting barrel.
The collecting vessel includes top circle, outer support, bottom ring, support clamping beam, supports bottom beam and gauze, be connected through outer support along circumference between top circle and the bottom ring, the top circle is inside to support through supporting clamping beam and consolidate, the bottom ring is inside to support through supporting the bottom beam and consolidate, the gauze is installed on outer support and supporting the bottom beam and the top is uncovered.
The technical scheme adopted by the application for solving the technical problems is to provide a method for using the quick-descent vertical trawl for investigation of biological resources in the Antarctic sea, which comprises the following steps:
(1) Suspending the vertical trawl on a hoisting winch and enabling the vertical trawl to be in a furled state;
(2) The lifting winch is utilized to continuously release the winding and unwinding lines, so that the vertical trawl is settled after entering water, and the supporting rods are kept in a furled state under the action of upward water resistance in the settlement process;
(3) After the throwing depth of the vertical trawl meets the experimental requirement, operating a hoisting winch to lift the vertical trawl upwards, wherein the vertical trawl is subjected to the action of water resistance in the downward direction in the lifting process, so that the supporting rods rotate downwards to enable the trawl opening to reach the unfolding state, and collecting the vertical trawl to a survey ship;
(4) The collecting barrel is quickly detached from the connecting platform, and plankton samples collected in the collecting barrel are collected.
In the step (2), a counterweight is connected to the connecting platform according to the requirement, and the position of the counterweight is lower than the height of the collecting barrel and the trawl net opening cannot be pulled open in a natural suspension state.
Advantageous effects
First, the vertical trawl of the application can be folded and folded, thereby facilitating storage and transportation of the trawl.
Secondly, the vertical trawl can keep a furled state in the descending process, is convenient for throwing operation, realizes automatic expansion of a trawl port by utilizing water resistance in the lifting process, and is simple and convenient to operate. The application can improve the descending speed of the trawl put into the water body, thereby improving the efficiency of biological sampling, and being beneficial to the realization of the investigation experiment of the vertical trawl with large-size net openings in deep sea areas. In addition, the trawl keeps a furled state, so that the occurrence of the overturning condition can be effectively avoided, the condition that the bottom collecting container is turned up to enter the net mouth due to the fact that wind waves are large or the flow speed is large is prevented, and the smooth completion of sampling work is guaranteed.
Thirdly, the collecting barrel is designed to be of a structure capable of being quickly assembled and disassembled, so that the collecting barrel can be quickly disassembled when biological samples are collected, the purpose of timely sample feeding is achieved, and the accuracy of investigation results is improved.
Drawings
Fig. 1 is a schematic view of the structure of the present application in an unfolded state.
Fig. 2 is a schematic view of the fully folded structure of the present application.
Fig. 3 is a schematic view showing a structure of the net mouth supporting rod in an unfolded state.
Fig. 4 is a schematic structural view of the furled state of the net mouth supporting rod.
Fig. 5 is a schematic view of a connection structure of the support bar and the center support.
Fig. 6 is a schematic structural view of the bottom of the trawl connected to the collection tub through the connection platform.
FIG. 7 is a schematic diagram of a preassembled structure between the connection platform and the collection tub.
Fig. 8 is a schematic structural view of the collecting vessel.
Detailed Description
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
The quick-descending vertical trawl for the south pole sea area biological resource investigation shown in fig. 1 and 2 comprises a winding and unwinding line 1, a net mouth line 3, a supporting rod 4, a central support 5, a net 6, a connecting platform 24 and a collecting barrel 9.
The winding and unwinding rope 1 is a winding and unwinding rope of a vertical trawl, the material is a steel wire rope, and the lower end of the winding and unwinding rope 1 is connected with the center support 5. The center support 5 is a stainless steel welding piece, a perforation is arranged at the center position of the center support 5, a stainless steel connecting piece is sleeved on the center support 5 through the center perforation, as shown in fig. 3, an upper connecting ring 2 is arranged at the upper end of the connecting piece, a lower connecting ring 10 is arranged at the lower end of the connecting piece, and the lower end of the winding and unwinding line 1 is connected with the upper connecting ring 2.
As shown in fig. 1 and 3, six support rods 4 are radially arranged on the central support 5 along the circumferential direction, the support rods 4 are aluminum alloy rods with the length of about 700mm, the width of 20mm and the thickness of 8mm, two ends are provided with holes, the holes at the outer side end are support rod outer holes 11, the aperture of 8mm, the holes at the inner side end are support rod inner holes 15, and the aperture of 11mm. The inner end of the supporting rod 4 is rotatably connected with the center support 5. As shown in fig. 4 and 5, six supporting rod clamping grooves 12 are radially formed on the center support 5 along the circumferential direction, two sides of each supporting rod clamping groove 12 are respectively provided with parallel clamping groove plates 14, the distance is 10mm, and symmetrical clamping groove openings 19 are formed in the clamping groove plates 14 on two sides. The inner side end of the support rod 4 is inserted into the support rod clamping groove 12 and is rotatably connected with clamping groove plates 14 on two sides through bolts 13, and the bolts 13 penetrate through clamping groove openings 19 on the inner side holes 15 of the support rod and the clamping groove plates 14 on two sides and are limited by screwing nuts.
The bottom of the corresponding supporting rod clamping groove 12 on the center support 5 is provided with a vertical rotation limiting groove 16, the inner end of the vertical rotation limiting groove 16 is of an arc structure, the outer end of the vertical rotation limiting groove 16 is of a wedge-shaped limiting end 17, and the outer side of the vertical rotation limiting groove 16 is provided with a horizontal support limiting boss 18. When the supporting rod 4 rotates downwards to the horizontal position, the bottom of the supporting rod 4 can be supported through the horizontal supporting limiting boss 18 to form the limit of the horizontal direction, and the supporting strength of the supporting rod 4 is improved. When the supporting rod 4 rotates upwards to the limit position, the limiting end 17 outside the vertical rotation limiting groove 16 limits the inner bottom corner 20 of the supporting rod 4, so that the supporting rod 4 is prevented from rotating upwards excessively, the included angle between the wedge-shaped right-angle edge of the limiting end 17 and the central support 5 is 85 degrees, the supporting rod 4 cannot reach the vertical position after being folded, and the supporting rod is in a slightly outwards-stretched state, so that the supporting rod can be opened in time after being subjected to water flow impact force when the trawl is lifted upwards. The outer bottom angle 21 of the support rod 4 is provided with a chamfer structure, which is beneficial to improving the smoothness of rotation of the support rod 4.
The outer side end of the supporting rod 4 is connected with the net mouth edge line 3 through the supporting rod outer hole 11 to form a ring, and the net mouth edge line 3 is used for supporting the net mouth shape. The upper end of the net 6 is connected with the net mouth border rope 3, the lower end is connected with the connecting platform 24, and the net 6 is funnel-shaped when being unfolded. The net 6 is a nylon gauze with a mesh of 1mm and is used for capturing marine organisms. The net mouth side line 3 adopts an elastic line, the elasticity of the net mouth side line 3 needs to meet the following conditions, and when the vertical trawl is in a suspension state or in a descending state in seawater and the support rod 4 rotates upwards until the net mouth is folded, the pretightening force of the net mouth side line 3 enables the net mouth to be kept folded; when the vertical trawl is in an upward lifting state in seawater, the pretightening force of the net mouth side rope 3 can be overcome under the action of water resistance, and the supporting rod 4 is rotated downwards to a horizontal position to enable the net mouth to be unfolded.
As shown in fig. 6, the connecting platform 24 is provided with a bottom line connecting hole 28 with a hole diameter of 5mm along the circumferential direction, the bottom end of the net 6 is connected with the bottom line, and the bottom line is connected with the connecting platform 24 through the bottom line connecting hole 28. As shown in fig. 8, the collecting vessel 9 includes a top ring 29, an outer support 25, a bottom ring 27, a support clamping beam 23, a support bottom beam 32 and a gauze 26, and the main body structure of the collecting vessel 9 is made of stainless steel material. The top ring 29 and the bottom ring 27 are connected by outer supports 25 distributed at uniform intervals in the circumferential direction. The top ring 29 is internally supported and reinforced by three support clamping beams 23, the three support clamping beams 23 are uniformly distributed at intervals along the circumferential direction of the top ring 29, and the width of the support clamping beams 23 is 6mm and the thickness is 5mm. The inside of the bottom ring 27 is supported and reinforced by three supporting bottom beams 32, and the three supporting bottom beams 32 are uniformly distributed at intervals along the circumferential direction of the bottom ring 27. The gauze 26 is a nylon gauze with a mesh of 1mm, and is mounted on the outer support 25 and the support bottom beam 32, and the top of the gauze 26 is open for collecting plankton trapped in the netting 6.
The upper end of the collecting vessel 9 is connected with the connecting platform 24 through a quick detachable structure. As shown in fig. 7, the connection platform 24 includes a connection ring 22, three rotation clamping grooves 30 are uniformly arranged on the connection ring 22 at intervals along the circumferential direction, the rotation clamping grooves 30 are similar to an inverted concave structure, three support clamping beams 23 on the top of the collection barrel 9 are inserted into the rotation clamping grooves 30, and rapid installation connection and detachment are realized through relative rotation between the connection platform 24 and the collection barrel 9. The collecting vessel connecting ring 22 made of stainless steel is fixed at the center of the supporting clamping beam 23, the safety rope 7 is connected between the center support 5 and the collecting vessel 9, the upper end of the safety rope 7 is connected with the lower connecting ring 10, and the lower end of the safety rope is connected with the collecting vessel connecting ring 22 through the spring hook 8, so that the safety rope is convenient to connect and detach quickly. Through the safety rope 7, the collecting vessel 9 can be effectively prevented from losing after being separated.
The quick-descent vertical trawl for the south-pole sea area biological resource investigation is characterized in that when in use:
(1) Firstly, the vertical trawl is suspended on a hoisting winch, and the vertical trawl is in a furled state
(2) The lifting winch is utilized to continuously release the winding and unwinding rope 1, so that the vertical trawl is settled after entering water, and the supporting rod 4 is kept in a furled state under the action of upward water resistance in the settlement process. If the bottom weight is insufficient or the flow speed is too high, so that the netting can drift transversely, a counterweight can be connected to the connecting platform 24 according to the situation, the position of the counterweight cannot be higher than the collecting barrel 9, and the trawl opening cannot be pulled open under the natural suspension state.
(3) After the vertical trawl throwing depth reaches the experimental requirement, the hoisting winch is operated to lift the vertical trawl upwards, and the vertical trawl is subjected to the action of water resistance in the downward direction in the lifting process, so that the support rods 4 rotate downwards, the trawl opening reaches the unfolding state, and the vertical trawl is collected to the investigation ship.
(4) The vertical trawl receives the deck and is connected to the hoisting winch, at this time, the collecting barrel 9 can be pushed upwards slightly by force and rotated anticlockwise, the supporting clamping beam 23 can be separated from the rotating clamping groove 30, and then the spring hook 8 at the lower part of the safety rope 7 at the upper part of the collecting barrel 9 is opened and taken down from the collecting barrel connecting ring 22, so that the sample in the collecting barrel 9 is collected. The other collecting barrels 9 can be replaced in time to continuously sample according to the requirement, or the sampling work can be continuously carried out after the next investigation site is reached.
The vertical trawl can keep a furled state in the descending process, and the automatic expansion of the trawl mouth is realized by utilizing the water resistance in the lifting process, so that the operation is simple and convenient, and the descending speed of the trawl put into the water body is improved. It should be noted that, in the practical application process, the vertical trawl is difficult to keep the net mouth in a completely folded state all the time under the action of the forced water flow in the descending process, but is in a dynamic folding and unfolding process close to the folded state, namely, the relative folded state, and the relative folded state can achieve the purpose of improving the descending speed of the vertical trawl, and is considered to be in the folded state and protected by the application.
Claims (9)
1. The utility model provides a perpendicular trawl of quick drop formula that south pole sea area biological resource investigation used, includes receive and releases class (1), net gape limit class (3), bracing piece (4), center support (5), net (6), connection platform (24) and collecting vessel (9), its characterized in that: the lower end of the winding and unwinding line (1) is connected with a central support (5), the central support (5) is radially provided with a plurality of support rods (4) along the circumferential direction, the inner ends of the support rods (4) are rotatably connected with the central support (5), when the support rods (4) rotate downwards to a horizontal position, the bottoms of the support rods (4) and the central support (5) form a limit support in the horizontal direction, the net mouth line (3) adopts an elastic line and is connected with the outer ends of the circumferential support rods (4), the upper end of the net clothes (6) is connected with the net mouth line (3), the lower end of the net clothes (6) is connected with a connecting platform (24) and is in a funnel shape when the net clothes (6) are unfolded, the upper end of the collecting barrel (9) is connected with the connecting platform (24) through a quick detachable structure, and when the vertical trawl is in a suspended state or in seawater, and the support rods (4) rotate upwards to the net mouth to be folded, the net mouth is kept in a folded state by the pretightening force of the net mouth line (3); when the vertical trawl is in an upward lifting state in the sea water, the support rod (4) is rotated downwards to a horizontal position under the action of water resistance, so that the net opening is unfolded.
2. A rapid-lowering vertical trawl for use in antarctic sea area biological resource research as claimed in claim 1, wherein: a plurality of supporting rod clamping grooves (12) are radially formed on the central support (5) along the circumferential direction, parallel clamping groove plates (14) are respectively arranged on two sides of the supporting rod clamping grooves (12), vertical rotation limiting grooves (16) are formed in the bottoms of the supporting rod clamping grooves (12), horizontal supporting limiting bosses (18) are arranged on the outer sides of the vertical rotation limiting grooves (16), the inner side end of the supporting rod (4) is inserted into the supporting rod clamping groove (12) and is rotatably connected with the clamping groove plates (14) on two sides, and the supporting rod (4) is supported to form limit through a horizontal supporting limit boss (18) when rotating downwards to a horizontal position and is limited through a limit end (17) on the outer side of the vertical rotating limit groove (16) when rotating upwards to a limit position.
3. A rapid-lowering vertical trawl for use in antarctic sea area biological resource research as claimed in claim 1, wherein: a safety rope (7) is connected between the center support (5) and the collecting barrel (9), and the safety rope (7) is detachably connected with the collecting barrel (9).
4. A rapid-lowering vertical trawl for use in antarctic sea area biological resource research according to claim 3, wherein: the center position of the center support (5) penetrates through the center support (5) to be sleeved with a connecting piece, an upper connecting ring (2) is arranged at the upper end of the connecting piece, a lower connecting ring (10) is arranged at the lower end of the connecting piece, the lower end of the winding and unwinding rope (1) is connected with the upper connecting ring (2), and the upper end of the safety rope (7) is connected with the lower connecting ring (10).
5. A rapid-lowering vertical trawl for use in antarctic sea area biological resource research as claimed in claim 1, wherein: the connecting platform (24) is circumferentially provided with a bottom line connecting hole (28), the bottom end of the net (6) is connected with the bottom line, and the bottom line is connected with the connecting platform (24) through the bottom line connecting hole (28).
6. A rapid-lowering vertical trawl for use in antarctic sea area biological resource research as claimed in claim 1, wherein: the connecting platform (24) comprises a connecting ring (22), a plurality of rotary clamping grooves (30) are formed in the connecting ring (22) along the circumferential direction, supporting clamping beams (23) corresponding to the rotary clamping grooves (30) are arranged at the top of the collecting barrel (9), and the supporting clamping beams (23) are inserted into the rotary clamping grooves (30) to realize installation connection and disassembly through relative rotation between the connecting platform (24) and the collecting barrel (9).
7. A rapid-lowering vertical trawl for use in antarctic sea area biological resource research as claimed in claim 1, wherein: the collecting vessel (9) comprises a top ring (29), an outer support (25), a bottom ring (27), a support clamping beam (23), a support bottom beam (32) and a gauze (26), wherein the top ring (29) and the bottom ring (27) are connected through the outer support (25) along the circumferential direction, the top ring (29) is internally supported and reinforced through the support clamping beam (23), the bottom ring (27) is internally supported and reinforced through the support bottom beam (32), and the gauze (26) is installed on the outer support (25) and the support bottom beam (32) and has an open top.
8. A method of using the rapid-lowering vertical trawl of claim 1 for use in a antarctic sea area biological resource survey, comprising the steps of:
(1) Suspending the vertical trawl on a hoisting winch and enabling the vertical trawl to be in a furled state;
(2) The lifting winch is utilized to continuously release the winding and unwinding rope (1) so that the vertical trawl is settled after entering water, and the supporting rod (4) is kept in a furled state under the action of upward water resistance in the settlement process;
(3) After the vertical trawl throwing depth reaches the experimental requirement, operating a hoisting winch to lift the vertical trawl upwards, wherein the vertical trawl is subjected to the action of water resistance in the downward direction in the lifting process, so that the support rods (4) rotate downwards to enable the trawl ports to reach the unfolding state, and collecting the vertical trawl to a survey ship;
(4) The collecting barrel (9) is quickly detached from the connecting platform (24), and plankton samples collected in the collecting barrel (9) are collected.
9. The method for using the quick-descent vertical trawl for south pole sea area biological resource investigation according to claim 8, wherein the method comprises the following steps: in the step (2), a counterweight is connected to the connecting platform (24) according to the requirement, the position of the counterweight is lower than the height of the collecting barrel (9) and the trawl opening cannot be pulled open under the natural suspension state.
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| CN202010836265.0A CN111903627B (en) | 2020-08-19 | 2020-08-19 | Quick-descending vertical trawl for investigation of biological resources in Antarctic sea area and use method |
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| CN202010836265.0A CN111903627B (en) | 2020-08-19 | 2020-08-19 | Quick-descending vertical trawl for investigation of biological resources in Antarctic sea area and use method |
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| CN212488068U (en) * | 2020-08-19 | 2021-02-09 | 中国水产科学研究院东海水产研究所 | Fast-descending vertical trawl used for biological resource investigation of Antarctic sea area |
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| SU1158134A1 (en) * | 1983-09-23 | 1985-05-30 | Клайпедская База Океанического Рыболовного Флота | Trawl for catching fish |
| CN2662643Y (en) * | 2003-11-17 | 2004-12-15 | 中国水产科学研究院东海水产研究所 | Double plankton vertical net |
| CN104089792A (en) * | 2014-05-14 | 2014-10-08 | 浙江省海洋水产研究所 | Anchored bentonic organism acquisition system and acquisition method thereof |
| CN205962354U (en) * | 2016-08-30 | 2017-02-22 | 周璐扬 | Marine organism sampling network |
| CN206821749U (en) * | 2017-06-09 | 2018-01-02 | 国家海洋局第一海洋研究所 | A kind of neritic plankton adopts collecting net equipment |
| CN110115239A (en) * | 2019-06-21 | 2019-08-13 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of collapsible floating marine fishery cultivating platform |
| CN212488068U (en) * | 2020-08-19 | 2021-02-09 | 中国水产科学研究院东海水产研究所 | Fast-descending vertical trawl used for biological resource investigation of Antarctic sea area |
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