Marine ranching fishery carbon sink metering device

Abstract

The application discloses a marine ranching fishery carbon sink metering device in the technical field of carbon sink metering, which comprises a traction rope and a sampling cylinder, a counterweight assembly is fixedly connected to the top end of the sampling cylinder, a rotating assembly for rotating the counterweight assembly and the sampling cylinder under the flow of seawater when the sampling cylinder vertically descends in the sea is arranged on the surface of the counterweight assembly, and the top end of the counterweight assembly is detachably connected with the traction rope. The stability of the sampling cylinder during descending is enhanced through the counterweight assembly, meanwhile, the rotating assembly drives the counterweight assembly and the sampling cylinder to rotate under the action of seawater flow, a stable effect similar to a gyroscope is formed, the problem that the sampling cylinder deviates from the vertical line caused by the impact of sea current and the drift of the ship body is effectively offset, the sediment sampling accurately corresponds to the preset area is ensured, and more reliable sampling data for the quantification and accounting of the sediment carbon sink in the marine ranching fishery carbon sink metering is provided.

Description

Technical Field

[0001] This invention relates to the field of carbon sequestration technology, and specifically to a carbon sequestration metering device for marine ranching fisheries. Background Technology

[0002] The core of marine ranching fisheries carbon sinks is the "net increase in carbon," which is the total amount of carbon fixed through fisheries activities minus the total amount of carbon emitted during those activities. Specifically, it includes the following types of carbon pools: biological carbon pools, sedimentary carbon pools, and carbon emission processes. Among these, sedimentary carbon pools refer to the long-term stored carbon (such as organic carbon in sediments) formed by the decomposition or burial of unused feed residues, biological waste, and dead organism remains that settle to the seabed in marine ranches.

[0003] In existing technologies, sediment sampling typically uses columnar sediment samplers (such as the TC-600G gravity columnar sediment sampler, which uses gravity for sampling) to collect seabed sediments, analyze the organic carbon content at different depths, and estimate sedimentary carbon reserves and burial rates. In marine ranching carbon sequestration, precise sampling of specific areas is required. However, in actual use, ocean currents may push the sampler off-line, especially in areas with greater water depth or faster currents. Furthermore, the drift of the vessel due to wind and waves can also cause the sampler to sway and deviate from the vertical line, resulting in sampling points deviating from the preset locations.

[0004] Therefore, this invention proposes a carbon sequestration metering device for marine ranching fisheries to solve the above-mentioned problems. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a marine ranching fishery carbon sink metering device. Utilizing the relative motion between the sampling tube and seawater during descent, the sampling tube rotates under the influence of seawater flow, creating a stabilizing effect. This effectively counteracts the deviation of the sampling tube from the vertical line caused by ocean current impact and ship drift, ensuring accurate sediment sampling corresponding to a preset area. This provides more reliable sampling data for the quantitative accounting of sediment carbon pools in marine ranching fishery carbon sink metering.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A marine ranch fishery carbon sequestration metering device includes a tow rope and a sampling tube. A counterweight assembly is fixedly connected to the top of the sampling tube. The surface of the counterweight assembly is provided with a rotating component for rotating the counterweight assembly and the sampling tube when the sampling tube is vertically descending in the ocean due to the flow of seawater. The top of the counterweight assembly is detachably connected to the tow rope.

[0007] Basic principle: When the sampling tube descends vertically in the ocean, the seawater flow acts on the rotating component on the surface of the counterweight assembly, causing the rotating component to rotate along with the counterweight assembly and the sampling tube. The angular momentum generated by the rotation creates a stabilizing effect similar to that of a gyroscope. Combined with the increased weight of the counterweight assembly itself, this effectively resists the impact of ocean currents and the interference forces caused by ship drift, ensuring that the sampling tube remains vertical and descends precisely towards the preset sampling point.

[0008] The above-mentioned scheme has the following beneficial effects: First, the synergistic effect of the rotating component and the counterweight component significantly improves the vertical stability of the sampling tube in complex marine environments, solving the problem of sampling point deviation caused by ocean currents and ship drift in existing technologies, and ensuring the accuracy of the sampling position; Second, the detachable connection design of the counterweight component and the towing rope facilitates the disassembly, maintenance and replacement of the device, improving the practicality and service life of the equipment; Third, stable and accurate sampling can provide reliable samples for the analysis of organic carbon content in sedimentary carbon pools, thereby improving the accuracy of carbon sink measurement in marine ranching fisheries, and providing a more scientific basis for relevant carbon sink assessment, policy formulation and blue carbon economic development.

[0009] Furthermore, the counterweight assembly includes a placement cylinder, a sealing cover, and several counterweight blocks. The placement cylinder and the sealing cover are detachably connected. A limiting rod for installing the counterweight blocks inside the placement cylinder is fixedly connected to the bottom wall of the placement cylinder. A traction seat is rotatably connected to the top of the sealing cover, and the traction seat is detachably connected to the traction rope.

[0010] Beneficial effects: The detachable connection between the placement tube and the sealing cap facilitates quick loading and unloading of the counterweights. The number of counterweights can be flexibly adjusted according to different marine environments (such as water depth and current strength), precisely controlling the descent speed and stability of the sampling tube. The limiting rod effectively limits the counterweights, preventing them from swaying inside the placement tube and ensuring the stability of the counterweight assembly's center of gravity, further enhancing the verticality of the sampling tube during descent. The traction seat, rotatably connected to the top of the sealing cap, allows the traction rope to rotate relative to the counterweight assembly, preventing the traction rope from tangling when the sampling tube rotates. At the same time, the detachable connection between the traction seat and the traction rope facilitates the overall storage, transportation, and component replacement of the device, improving the adaptability and ease of use of the equipment.

[0011] Furthermore, the rotating assembly includes several guide vanes, which are arranged in a circular array on the surface of the placement cylinder and extend from one end of the placement cylinder to the other.

[0012] Beneficial effects: The circular array of guide vanes can evenly receive seawater flow from different directions. During the descent of the sampling tube, the impact force of the seawater on the guide vanes is converted into rotational torque, driving the placement tube and sampling tube to rotate stably and ensuring the uniformity of the rotation effect. The design of the guide vanes extending from one end of the placement tube to the other maximizes the use of the seawater flow path, improves rotation efficiency, ensures stable rotation speed, and thus enhances the stability of the gyroscope effect, effectively counteracting the interference of ocean currents and ship drift. In addition, this structural design is simple and strong, can adapt to complex marine environments, reduce the wear and tear on components caused by water flow impact, extend the service life of the device, and provide a reliable guarantee for the stability of the sampling process.

[0013] Furthermore, a balance hole is opened on the side wall of the sampling cylinder, the balance hole is close to the placement cylinder and a one-way valve is installed in the balance hole.

[0014] Beneficial effects: During sampling, water inside the container is allowed to drain through the balance hole, preventing water accumulation inside the container from affecting the sampling operation or causing the sample to be diluted, thus ensuring the purity and integrity of the sediment sample.

[0015] Furthermore, a push rod is slidably fitted inside the limiting rod. One end of the push rod extends into the sampling cylinder and is fixedly connected to a piston, while the other end of the push rod extends into the placement cylinder.

[0016] Beneficial effects: The sliding fit design of the push rod and the limiting rod can drive the piston in the sampling tube to move along the tube wall by pushing the end of the push rod inside the tube, so as to quickly push out the precipitate sample. This solves the problem that the traditional sampling tube is difficult to remove because the sample is tightly attached to the inner wall, and greatly improves the convenience and efficiency of sample removal.

[0017] Furthermore, the bottom of the sampling tube has several annularly distributed toothed grooves.

[0018] Beneficial effects: The circular array of grooves, combined with the rotational motion of the sampling cylinder, allows the rotating grooves to rapidly act on the sediment surface upon contact, using their sharp edges to quickly cut and pierce the sediment at the contact point. This instantaneous cutting action breaks through the initial resistance of the sediment surface, allowing the sampling cylinder to gain a breakthrough point for downward insertion at the moment of contact, significantly shortening the initial insertion delay and achieving rapid penetration of the sediment.

[0019] Furthermore, a baffle assembly is fitted on the surface of the sampling tube to stably confine the sediment sample inside the sampling tube by utilizing the rotation of the sampling tube.

[0020] Beneficial effects: The baffle assembly can form a stable limiting effect on the internal sediment sample by means of the rotation of the sampling tube. During the sampling and lifting process of the sampling tube, it can effectively prevent the sediment sample at the bottom from falling off due to gravity or water flow impact, ensuring the integrity of the collected sample and avoiding analytical errors caused by sample loss.

[0021] Furthermore, the baffle assembly includes a baffle ring sleeved on the surface of the sampling cylinder, and the baffle ring is close to the bottom end of the sampling cylinder; the baffle ring has a plurality of telescopic grooves arranged in an annular array, and each telescopic groove is slidably fitted with a baffle plate, and the baffle plate is slidably fitted with the sampling cylinder; each telescopic groove is provided with a plurality of first springs, one end of each first spring is fixedly connected to the side wall of the telescopic groove, and the other end of each first spring is fixedly connected to the baffle plate.

[0022] The partition ring has several sliding cavities that correspond one-to-one with the telescopic grooves, and all sliding cavities are connected to the telescopic grooves; each sliding cavity has a slider that is slidably fitted inside, and each slider is fixedly connected to a second spring, with the end of the second spring away from the slider fixedly connected to the side wall of the sliding cavity.

[0023] Beneficial effects: The baffle ring, located near the bottom of the sampling cylinder, can precisely limit the bottom sample, reducing the risk of detachment from the source. The baffles in the annular array, under the elastic force of the first spring, tightly adhere to the inner wall of the sampling cylinder. When the sampling cylinder rotates, the baffles move synchronously with it, forming an annular sealing barrier that effectively holds the bottom sample, preventing it from falling off due to gravity or water flow impact.

[0024] Furthermore, the end of the sliding cavity furthest from the second spring is connected to a balance airbag disposed within the partition ring.

[0025] Beneficial effects: The design of the connection between the balancing airbag and the sliding cavity can balance the air pressure change in the sliding cavity through the elastic expansion and contraction of the airbag when the slider is compressed by the reaction force of the sample. This avoids the slider movement being hindered by excessive air pressure and ensures smoother buffering and adjustment of the sample by the baffle.

[0026] Furthermore, the sliding cavity is filled with hydraulic oil on the side near the second spring.

[0027] Beneficial effects: Hydraulic oil has good fluidity and incompressibility. Combined with the centrifugal force of the slider, it can effectively and quickly push out the baffle and quickly catch the sample in the sampling cylinder.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is an overall isometric view of an embodiment of the marine ranch fishery carbon sequestration metering device of the present invention;

[0030] Figure 2 This is a front sectional view of the counterweight component in an embodiment of the marine ranching fishery carbon sink metering device of the present invention;

[0031] Figure 3 This is a top sectional view of the baffle assembly in an embodiment of the marine ranch fishery carbon sink metering device of the present invention;

[0032] Figure 4 This is a side sectional view of the baffle assembly in an embodiment of the marine ranch fishery carbon sink metering device of the present invention.

[0033] The reference numerals in the accompanying drawings of the instruction manual include: 1. Sampling cylinder; 2. Placement cylinder; 3. Guide vane; 4. Traction seat; 5. Traction rope; 6. Baffle ring; 601. Telescopic groove; 602. First spring; 603. Baffle plate; 604. Second spring; 605. Sliding block; 606. Sliding cavity; 607. Balance airbag; 7. Counterweight; 8. Limiting rod; 9. Push rod; 10. Piston; 11. Balance hole. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The following detailed description illustrates the specific implementation method:

[0038] Example 1:

[0039] like Figure 1 and Figure 2 As shown, a marine ranching fishery carbon sequestration metering device includes a tow rope 5, a sampling cylinder 1, and several counterweights 7. A placement cylinder 2 is integrally formed at the top of the sampling cylinder 1. The top of the placement cylinder 2 is open, and a sealing cap is screwed to the top of the placement cylinder 2. A limiting rod 8 is welded to the inner bottom wall of the placement cylinder 2. In actual operation, an appropriate number of counterweights 7 are selected according to the actual conditions of the measurement area (sea surface wind speed and ocean current velocity, etc.). The counterweights 7 are connected to the limiting rods 8 by threads, facilitating the installation and removal of the counterweights 7. Gravity is used to lower the sampling cylinder 1 into the ocean and vertically insert it into the sediment of the area to be sampled. Simultaneously, a traction seat 4 for binding with the tow rope 5 is rotatably connected to the top of the sealing cap. After sampling, the tow rope 5 is retrieved, and the sampling cylinder 1 is lifted out of the sea to test the sample, thereby measuring the carbon sequestration in the sedimentary carbon pool.

[0040] However, during the actual descent, ocean currents may push the sampler off the vertical line, especially in areas with greater water depth or faster current. Secondly, the drift of the vessel due to wind and waves can also cause the sampler to sway and deviate from the vertical line, resulting in the sampling point deviating from the preset position. Therefore, the special feature of this solution is that... Figure 1 As shown, several guide vanes 3 are welded to the surface of the placement cylinder 2. These guide vanes 3 are arranged in a circular array and extend from one end of the placement cylinder 2 to the other. Specifically, when the sampling cylinder 1 falls to the seabed under gravity, the seawater flows upwards relative to the guide vanes 3. Because the guide vanes 3 are arranged in a circular array and extend along the axial direction of the placement cylinder 2, their unique tilt angle and arrangement cause uneven impact forces when the seawater flows over them. This impact force is converted into a rotational torque along the axis of the placement cylinder 2, causing the entire device (including the placement cylinder 2 and the sampling cylinder 1) to rotate continuously. The angular momentum generated during rotation creates a stabilizing effect similar to a gyroscope. When ocean currents impact the device from the side or the hull drifts, causing the device to sway, this stabilizing effect effectively resists interference forces, ensuring that the device maintains a stable rotation around its own axis. This ensures that the sampling cylinder 1 remains vertical during its descent, accurately moving towards the preset sampling point, minimizing deviation from the sampling point, and providing a reliable sampling basis for accurate measurement of the subsequent sedimentary carbon pool.

[0041] Meanwhile, the bottom of the sampling tube 1 has several annularly distributed grooves. When the sampling tube 1 contacts the seabed sediment while rotating, the annularly distributed grooves act like a rotating saw blade, quickly cutting into the sediment. The impact force of rotation and the segmenting effect of the grooves on the sediment significantly reduce the resistance encountered when the sampling tube 1 is inserted. Especially for sediments with relatively hard texture or containing more impurities, the groove design can effectively break the integrity of the sediment, making it easier and more efficient for the sampling tube 1 to penetrate to the preset depth, ensuring the integrity of the sampling. At the same time, it can also reduce the possibility that the sampling tube 1 will tilt during insertion due to the different surface hardness of the sediment. In addition, the vertical stability provided by the guide plate 3 ensures that the sampling operation is accurate and reliable, providing a more representative sample for the carbon sink measurement of the sedimentary carbon pool.

[0042] Secondly, a balance hole 11 is provided on the side wall of the sampling tube 1. The balance hole 11 is close to the placement tube 2 and a one-way valve is installed inside the balance hole 11. This is because when the sampling tube 1 is inserted, the sediment in the sampling tube 1 will squeeze the seawater in the sampling tube 1. If this seawater is not discharged from the sampling tube 1 in time, under the squeezing action, this part of the seawater will damage the collected sample, causing changes in the original layered structure of the sample, thereby affecting the subsequent carbon sink measurement results. When the sediment enters from the bottom of the sampling tube 1, the seawater in the sampling tube 1 is discharged through the balance hole 11, reducing the possibility of this seawater flowing out from the bottom of the sampling tube 1, thereby reducing the impact of friction between the inner wall of the sampling tube 1 and the sediment, improving the integrity of the sample during subsequent lifting (reducing its probability of falling off).

[0043] A push rod 9 is slidably fitted inside the limiting rod 8. One end of the push rod 9 extends into the sampling cylinder 1 and is integrally formed with a piston 10. The other end of the push rod 9 extends into the placement cylinder 2. The end of the push rod 9 located in the placement cylinder 2 can be threaded to other support rods for sample removal. When it is necessary to remove the sediment sample from the sampling cylinder 1, the operator can apply a downward pushing force to the end of the push rod 9 located in the placement cylinder 2 (if the resistance to sample removal is large, other support rods can be threaded to extend the length of the push rod 9 and increase the pushing force output). Due to the sliding fit between the push rod 9 and the limiting rod 8, the pushing force will cause the push rod 9 to slide downward along the axis of the limiting rod 8.

[0044] When the push rod 9 moves downward, its end extending into the sampling cylinder 1 will simultaneously drive the integrally formed piston 10 to move downward. The piston 10 fits tightly against the inner wall of the sampling cylinder 1, and during the downward movement, it will generate a uniform thrust on the sediment sample in the sampling cylinder 1, gradually pushing the sample out from the bottom of the sampling cylinder 1.

[0045] As push rod 9 continues to slide downwards, piston 10 gradually moves from the top to the bottom of sampling cylinder 1 until the sediment sample inside the cylinder is completely pushed out, completing the sample removal operation. After the operation is completed, pulling push rod 9 in the opposite direction will allow piston 10 to return to its original position along with push rod 9, so that the device can be used for the next sampling.

[0046] Example 2:

[0047] Unlike the embodiments described above, in this case, during the recovery process, some sediment may easily detach from the sampling cylinder 1 due to gravity or inertial force (uneven lifting speed). Simultaneously, during the recovery process, the seawater and the guide vane 3 will also undergo relative motion (from top to bottom), causing the device to rotate (straight-line rotation) during recovery, only in the opposite direction to the rotation direction described in Embodiment 1. Therefore, this solution, specifically, as... Figure 1 , Figure 3 and Figure 4 As shown, the sample includes a baffle ring 6 fitted onto the surface of the sampling cylinder 1, with the baffle ring 6 close to the bottom of the sampling cylinder 1; the baffle ring 6 has a plurality of telescopic grooves 601 arranged in a ring array inside, and each telescopic groove 601 has a baffle plate 603 slidably fitted inside the telescopic groove 601, and each baffle plate 603 slidably fitted inside the sampling cylinder 1; each telescopic groove 601 has a plurality of first springs 602, one end of each first spring 602 is welded to the side wall of the telescopic groove 601, and the other end of each first spring 602 is welded to the baffle plate 603; the baffle ring 6 has a plurality of sliding cavities 606 corresponding one-to-one with the telescopic grooves 601, and each sliding cavity 606 is connected to the telescopic groove 601; each sliding cavity 606 has a slider 605 slidably fitted inside the sliding cavity 606, and each slider 605 has a second spring 604 welded to it, with the end of the second spring 604 away from the slider 605 fixedly connected to the side wall of the sliding cavity 606.

[0048] The end of the sliding cavity 606 furthest from the second spring 604 is connected to a balance airbag 607 disposed within the partition ring 6. This ensures that when the slider 605 slides within the sliding cavity 606, the air pressure on the side of the second spring 604 at the distal end of the sliding cavity 606 remains relatively stable. This allows most of the centrifugal force of the slider 605 to act on the hydraulic oil, ensuring the ejection of the baffle 603. The sliding cavity 606 near the second spring 604 is filled with hydraulic oil. Utilizing the good fluidity and incompressibility of the hydraulic oil, combined with the centrifugal force of the slider 605, the baffle 603 can be effectively and quickly ejected, rapidly catching the sample in the sampling cylinder 1.

[0049] The specific implementation process is as follows: When the device completes sampling and enters the recovery stage, it is lifted upwards under the pull of the traction rope 5. The seawater flows from top to bottom relative to the guide plate 3, causing the device to rotate in the opposite direction to its descent. At this time, the baffle ring 6 rotates synchronously with the sampling cylinder 1. Under the action of centrifugal force, the slider 605 slides relative to the second spring 604 in the sliding cavity 606, moving towards the second spring 604 and squeezing the second spring 604. At the same time, it squeezes the hydraulic oil in the sliding cavity 606 near the second spring 604. Since the hydraulic oil is incompressible, the squeezed hydraulic oil flows into the connected telescopic groove 601, thereby pushing the baffle 603 in the telescopic groove 601 to slide away from the side wall of the telescopic groove 601. Under the thrust of hydraulic oil, the baffle 603 overcomes the tension of the first spring 602 (which may be in a slightly retracted state in the initial state) and water pressure to extend out of the telescopic groove 601, gradually approaching and finally adhering to the inner wall of the sampling cylinder 1, forming a ring-shaped structure to hold the bottom of the sample, initially preventing the sample from falling off due to gravity or lifting inertia.

[0050] Furthermore, during the descent process, although the baffle 603 extends, when the sampling tube 1 contacts and inserts into the sediment on the seabed, the rotational kinetic energy of the sampling tube 1 is rapidly dissipated, thereby eliminating the centrifugal force of the slider 605, and the baffle 603 retracts without affecting the sediment sampling operation. Simultaneously, after the sampling tube 1 is lifted out of the sea, it continues to rotate due to inertia, thus maintaining the stability of the baffle 603 extension and ensuring that the sample is stably preserved inside the sampling tube 1 even after it falls into the seawater.

[0051] The following are some of the experiments conducted for this scheme:

[0052] I. Experimental Objective:

[0053] The purpose of this study was to verify whether the marine ranch fishery carbon sequestration metering device could effectively maintain the verticality of the sampling tube under different ocean current intensities and ship drift conditions, ensuring that the sampling points accurately correspond to the preset areas.

[0054] The collaborative working effect of the various components of this device (counterweight components, rotating components, baffle components, etc.) in a real marine environment was tested to evaluate its role in improving the accuracy and integrity of sediment sampling.

[0055] The sampling performance of this device was compared with that of traditional columnar sediment samplers (such as the TC-600G gravity columnar mud sampler);

[0056] This scheme is the experimental group, and the traditional columnar sediment sampler is the control group.

[0057] II. Experimental Data Table:

[0058] Table 1 - Comparison of Sampling-Related Parameters

[0059] ;

[0060] As shown in Table 1, the device of this invention, through the synergistic effect of the guide plate 3 and the counterweight assembly, forms a gyroscope stabilization effect. Under different current intensities and ship drift conditions, the average level deviation is only 0.3-0.9m, and the maximum vertical deviation is ≤1.5°, which is far superior to traditional samplers (deviation 2.0-3.2m, vertical deviation 2.5-5.0°). This effectively solves the problem of sampling point deviation caused by current impact and ship drift, ensuring that sediment sampling accurately corresponds to the preset area. At the same time, when the device rotates, the centrifugal force pushes the baffle 603 to adhere to the inner wall of the sampling cylinder. Combined with the one-way drainage design of the balance hole 11, the sample integrity rate reaches 90%-97%, and the average weight is 150-300g higher than that of traditional samplers, effectively reducing sample detachment and stratification damage, and providing complete samples for the analysis of organic carbon content in the sedimentary carbon pool.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A marine ranching fishery carbon sequestration metering device, comprising a tow rope (5) and a sampling cylinder (1), characterized in that, A counterweight assembly is fixedly connected to the top of the sampling tube (1). The surface of the counterweight assembly is provided with a rotating component for the counterweight assembly and the sampling tube (1) to rotate due to the flow of seawater when the sampling tube (1) is vertically descending in the ocean. The top of the counterweight assembly is detachably connected to the traction rope (5). The counterweight assembly includes a placement cylinder (2), a sealing cover, and several counterweight blocks (7). The placement cylinder (2) and the sealing cover are detachably connected. A limiting rod (8) for installing the counterweight blocks (7) into the placement cylinder (2) is fixedly connected to the bottom wall of the placement cylinder (2). A traction seat (4) is rotatably connected to the top of the sealing cover. The traction seat (4) is detachably connected to the traction rope (5). The rotating assembly includes several guide vanes (3), which are arranged in a circular array on the surface of the placement cylinder (2) and all the guide vanes (3) extend from one end of the placement cylinder (2) to the other end. The sampling tube (1) is fitted with a baffle assembly for stabilizing and confining the sediment sample inside the sampling tube (1) by means of the rotation of the sampling tube (1); The baffle assembly includes a baffle ring (6) sleeved on the surface of the sampling cylinder (1), and the baffle ring (6) is close to the bottom of the sampling cylinder (1); the baffle ring (6) has a plurality of telescopic grooves (601) arranged in a ring array inside, and a baffle (603) is slidably fitted in each telescopic groove (601), and the baffle (603) is slidably fitted with the sampling cylinder (1); a plurality of first springs (602) are provided in each telescopic groove (601), one end of each first spring (602) is fixedly connected to the side wall of the telescopic groove (601), and the other end of each first spring (602) is fixedly connected to the baffle (603); The partition ring (6) has several sliding cavities (606) that correspond one-to-one with the telescopic groove (601). The sliding cavities (606) are all connected to the telescopic groove (601). Each sliding cavity (606) has a sliding block (605) that is slidably fitted inside it. Each sliding block (605) is fixedly connected to a second spring (604). The end of the second spring (604) away from the sliding block (605) is fixedly connected to the side wall of the sliding cavity (606).

2. The marine ranching fishery carbon sequestration metering device according to claim 1, characterized in that: The sampling tube (1) has a balance hole (11) on its side wall. The balance hole (11) is close to the placement tube (2) and a one-way valve is installed inside the balance hole (11).

3. The marine ranching fishery carbon sequestration metering device according to claim 2, characterized in that: The limiting rod (8) has a sliding fit with a push rod (9). One end of the push rod (9) extends into the sampling cylinder (1) and is fixedly connected to a piston (10). The other end of the push rod (9) extends into the placement cylinder (2).

4. The marine ranching fishery carbon sequestration metering device according to claim 3, characterized in that: The bottom of the sampling tube (1) has several annularly distributed toothed grooves.

5. The marine ranching fishery carbon sequestration metering device according to claim 4, characterized in that: The end of the sliding cavity (606) away from the second spring (604) is connected to a balance airbag (607) set in the partition ring (6).

6. The marine ranching fishery carbon sequestration metering device according to claim 5, characterized in that: The sliding cavity (606) is filled with hydraulic oil on the side near the second spring (604).

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