A device and method for monitoring total carbon dioxide in marine ranches

Abstract

The present invention discloses a device and method for monitoring total carbon dioxide in marine ranches, belonging to the field of marine ranch monitoring technology. The device comprises an above-water towing device and an underwater mobile device. The mobile device is connected to a sampling device, which includes multiple sampling cylinders, each of which is equipped with a hydraulic rod and a piston cover. The piston cover is connected to a stretchable sealing sleeve, and the hydraulic rod is connected to a tensioning ring that supports the deformation of the sealing sleeve. A frame assembly is connected above the sampling device and between the towing device, and the frame assembly includes multiple swingable plates. The present invention can provide multiple seals for collected water samples to prevent volatilization, and has sampling stability, thereby improving the accuracy of data monitoring.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine ranch monitoring, and in particular relates to a device and method for monitoring total carbon dioxide in a marine ranch. Background Art

[0002] The ocean is a significant carbon sink. Marine organisms absorb 55% of atmospheric CO2, hence the term "blue carbon." Marine ranching is a fishery model that aims to enhance and conserve fishery resources, improve the marine ecosystem, and achieve sustainable fishery resource utilization. It is a systematic approach to fishery resource enhancement that integrates the construction of artificial reefs, seaweed and seagrass beds, biological enhancement and release, supporting infrastructure development, and monitoring and management. Marine ranching blue carbon sinks significantly mitigate the greenhouse effect by sequestering atmospheric CO2. The sum of the four forms of dissolved CO2, carbonic acid, bicarbonate ions, and carbonate ions in seawater is called total CO2 (∑CO2) or dissolved inorganic carbon (DIC).

[0003] Generally speaking, the determination of inorganic carbon (DIC) in seawater includes two methods: general analysis and electrochemical analysis. Both analysis methods require seawater sampling. Existing seawater samplers are generally difficult to perform deep sampling, and the carbon dioxide contained in the collected water samples will evaporate in high temperature weather, causing subsequent measurement errors. In addition, the sampling device is difficult to seal, which will cause internal and external air to flow in and out of the sampler, thereby causing distortion of various water sample parameters.

[0004] The U.S. invention patent with publication number US20200116599A1 discloses an automatic water sampler. The automatic water sampler of the present invention includes: a driving unit operated according to the pressure measured by a pressure sensor; an active magnet approaching a driven magnet according to the operation of the driving unit; and a first wire unlocked by a control rod according to the movement of the driven magnet. The present invention automatically performs depth sampling of water at the correct depth identified by the pressure sensor, and improves the inaccuracy caused by the conventional interference of ocean currents, ensures the reliability and accuracy of the samples, and greatly reduces the sampling cost. However, when the invention performs deep water sampling, the external water pressure of the sampler can easily cause the sampling seal to fail, resulting in gas infiltration and sampling failure; and it is difficult for the device to maintain the original temperature and recover quickly after sampling, which can easily cause distortion of the test sample results. Summary of the Invention

[0005] The purpose of the present invention is to provide a marine ranch total carbon dioxide monitoring device and method that can efficiently and stably sample and quickly recover to improve monitoring accuracy.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are:

[0007] A device and method for monitoring total carbon dioxide in a marine ranch include a towing device and a mobile device. The towing device floats on the water surface and is equipped with a locator. The mobile device is connected below the towing device and includes a bracket connected to a driver and a water depth sensor, which is connected to a sampling device. The towing device floats on the water surface and transmits a positioning signal to facilitate retrieval and recovery. The mobile device is moved underwater by the driver to reach the designated water depth of the ranch for sampling. The bracket protects the sampling device, reducing the risk of damage during sinking.

[0008] Preferably, the sampling device includes a controller, which is connected to multiple sampling cylinders. The sampling cylinders are equipped with piston covers and sealing sleeves. The middle part of the sealing sleeve is convex to seal the inner wall of the sampling cylinder. The upper and lower ends of the sealing sleeve are respectively connected to the piston cover and the inner wall of the sampling cylinder. A hydraulic rod is fixed in the sampling cylinder, and the water depth sensor controls the extension and retraction of the hydraulic rod through the controller. The bracket relies on the driver to hover in the water. When the water depth sensor detects that there is no significant change in the water depth, the controller controls the hydraulic rod to extend, so that the piston cover leaves the sampling tube and the sealing sleeve is stretched at the same time. The convex middle part of the sealing sleeve is deformed by tension and loses its seal on the sampling tube. Under the action of water pressure, the external water flows into the sampling tube through the gap between the sealing sleeve and the sampling tube to achieve sampling. The gap helps the water to be sucked into the sampling tube, and there is no need to set up a pump suction device, which saves energy. The annular gap and the arrangement of multiple tubes can enable external water to be collected into the sampling tube from multiple directions, expanding the sampling range and thus improving the accuracy of carbon dioxide content determination. When the hydraulic rod is not extended, the piston cover and the sealing sleeve form two layers of seal on the inner wall of the sampling tube, which improves the sealing after water sample collection, reduces leakage caused by water pressure when the sampling tube rises, and avoids the influence of external high temperature and air pressure on water samples after landing, effectively preventing large errors in measurement results.

[0009] Preferably, a fixing member is provided below the sampling device, and the fixing member includes a base, an electromagnet, and a spring. The electromagnet is slidably connected to the base via the spring, and the electromagnet is electrically connected to a power source. An iron block is magnetically attached to the electromagnet, and a first rope is fixed to the iron block, and the first rope is fixed to the bottom of the controller. The sampling device is connected to the inner side of the upper part of the bracket through the fixing member. When the mobile device is suspended and disturbed by a lateral water flow, the sampling device pulls the first rope to drive the iron block and the electromagnet to stretch and compress the spring, buffering the shaking to ensure stable sampling while preventing the first rope from disconnecting and causing the sampling tube to float up quickly. After the sampling is completed, the power supply stops energizing the electromagnet, and the electromagnet releases the iron block to float the sampling device, thereby improving the recovery and collection efficiency and reducing the load on the bracket, thereby reducing the energy consumption of the driver when the bracket rises and saving costs.

[0010] Preferably, multiple filter screens are fixed to the bottom of the sealing sleeve, with meshes arranged in an up-and-down staggered arrangement, and the outer walls of the filter screens are fixed to the inner wall of the sampling barrel. The filter screens secure the sealing sleeve to the sampling barrel and simultaneously form a double-layer filtration system for the water, trapping large particles or dirt in the filter screens. This reduces the amount of particles and dirt that remain in the sampling barrel, potentially degrading the environment and affecting the quality of the water sample. Particles can be removed from the sampling barrel for cleaning by pushing out the hydraulic rod.

[0011] Preferably, a tension ring is fixed to the inner side of the sealing sleeve, a collar is fixed to the hydraulic rod, and a connecting rod is hingedly connected between the collar and the tension ring. The connecting rod is used to push the tension ring outward along the axis and squeeze the sealing sleeve. When the hydraulic rod is extended, it raises the collar, driving the connecting rod and the tension ring away from the sealing sleeve to achieve water collection. When the hydraulic rod is retracted, the connecting rod straightens, allowing the tension ring to support the convex position of the inner wall of the sealing sleeve, improving the sealing effect between the sealing sleeve and the sampling tube. Reduced external water pressure causes the sealing sleeve to concave inward and lose its sealing ability, preventing sample leakage.

[0012] Preferably, the piston cover and the sealing sleeve form a cavity, the piston cover having a plurality of through holes, and a sliding rod slidably disposed within the through holes, one end of the sliding rod being located outside the piston cover and secured with an outer baffle, while the other end of the sliding rod is located within the cavity and secured with an inner baffle. The inner and outer baffles restrict the sliding range of the sliding rod, and when the piston cover is pushed out, the sealing sleeve is stretched, and the changes in the cavity within the sealing sleeve cause the sliding rod to slide within the through holes, thereby extending the outer baffle outside the piston cover. This helps to drive away organisms or floating plants outside the sampling tube. On the one hand, this reduces the number of organisms that stay around and respire, which could result in a large amount of carbon dioxide in the collected water sample and ultimately lead to inaccurate measurement results. On the other hand, it prevents organisms or plants from being inhaled and clogging the sampling tube during sampling, affecting sampling efficiency. During the sampling process, when organisms impact the outer baffle, the outer baffle drives the sliding rod to slide within the through hole, causing the inner baffle to squeeze the space within the cavity and increase air pressure. The sealing sleeve, due to the increased air pressure, expands and abuts against the sealing sleeve at its convex position to seal, thereby reducing the amount of dirt, sediment, etc. carried or raised by the organisms from entering the sampling tube and affecting the water sample quality.

[0013] Preferably, a frame assembly is disposed above the sampling device. The frame assembly includes vertically arranged bearings and connecting columns. Multiple plates are hingedly connected to the sides of the connecting columns. A pull rope connects the outer ring of the bearing to the plate, a second rope connects the controller to the connecting column, and a third rope connects the inner ring of the bearing to the towing device. When water disturbances occur, the plate swings under the impact of the water flow, and the bearing simultaneously moves relative to the connecting column, pulling the plate to swing via the pull rope. This absorbs the water flow impact on the sampling device, improves sampling stability, and prevents the towing device from swaying on the water surface, which could cause the second rope to break. Furthermore, the swinging frame generates outward water ripples along the axis, preventing sediment from suspending and accumulating on the support when it sinks, making it difficult to recover and raise the mobile device. This also facilitates cleaning of the support after recovery. When the mobile device sinks, the plates connected to the outer ring of the bearing via the pull rope can tilt upward and rotate relative to the third rope, absorbing crossflow impact and reducing lateral displacement of the mobile device. This facilitates accurate sampling at a designated location to obtain the carbon dioxide content in the target area.

[0014] Preferably, the towing device is provided with a control motor, the output shaft of which is connected to a propeller. The towing device is also provided with a reeling device capable of retracting and extending the third rope. When the sampling device is disconnected from the fixed frame and freely floats upward, the reeling device reels the third rope, allowing the sampling assembly to be retrieved below the towing device. The control motor then controls the propeller to move the towing device across the water surface, facilitating water sample recovery while maintaining contact with the water and preventing prolonged exposure, thereby effectively reducing sample evaporation caused by high temperatures above the water surface.

[0015] The present invention utilizes a sampling device that can stably and multi-directionally collect water samples, thereby achieving the following beneficial effects: the piston cap and the sealing sleeve achieve a double-layer seal within the sampling barrel, improving sample monitoring accuracy; the sealing sleeve can deform to form a gap, enabling sampling under water pressure, reducing energy consumption and pump installation costs; when the hydraulic rod retracts, the expansion ring further strengthens the seal of the sealing sleeve, preventing deformation and leakage of the sealing sleeve caused by high pressure; the filter intercepts large particles of dirt, facilitating cleaning and preventing residual dirt from contaminating the sampling barrel; during sampling, the sliding rod drives the baffle to extend and repel organisms, reducing the risk of sampling blockage and also reducing excessive carbon dioxide content in the sample caused by biological respiration, thereby ensuring representative measured data; after sampling is completed, the sampling device is released by de-energizing the electromagnet, improving sample recovery efficiency and reducing driver power consumption, thereby achieving energy conservation; the frame assembly dissipates energy from ocean crosscurrents through the swinging of the plates, improving the suspension stability of the sampling device and facilitating sampling; the multiple plates can rotate in an inclined posture to reduce lateral displacement and sinking, improving the accuracy of the sampling points and facilitating accurate acquisition of carbon dioxide data in the target area. Therefore, the present invention is a marine ranch total carbon dioxide monitoring device and method that can efficiently and stably sample and quickly recover to improve monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of the connection between the towing device and the moving device;

[0017] Figure 2 This is a front view schematic diagram of the connection between the towing device and the moving device;

[0018] Figure 3 This is a half-section schematic diagram of the sampling tube;

[0019] Figure 4 It is a half-section schematic diagram of the slide bar;

[0020] Figure 5 It is a half-section schematic diagram of the fixing part;

[0021] Figure 6 Schematic diagram of the frame assembly structure.

[0022] Figure 1: Towing device 1; control motor 10; moving device 2; bracket 20; driver 21; water depth sensor 22; sampling device 3; controller 30; sampling cylinder 31; piston cover 32; sealing sleeve 33; hydraulic rod 34; filter screen 35; tensioning ring 36; collar 37; connecting rod 38; through hole 39; sliding rod 390; outer baffle 391; inner baffle 392; fixing part 4; base 40; electromagnet 41; spring 42; power supply 43; iron block 44; first rope body 45; frame assembly 5; connecting column 51; plate 52; pull rope 53; second rope body 54; third rope body 55. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below with reference to the specific embodiments and the accompanying drawings:

[0024] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See attached Figure 1 -Attached Figure 2 A total carbon dioxide monitoring device for marine ranching consists of a towing device 1 and a mobile device 2. The towing device 1 floats on the water surface and is equipped with a locator. The mobile device 2 is connected below the towing device 1 and includes a bracket 20 connected to a driver 21 and a water depth sensor 22. The water depth sensor 22 is connected to a sampling device 3. The towing device 1 floats on the water surface to send a positioning signal, facilitating retrieval and recovery. The mobile device 2 is moved underwater by the driver 21 to reach the designated water depth of the ranch for sampling. The bracket 20 protects the sampling device 3, reducing the risk of damage during sinking.

[0026] See attached Figure 3 -Attached Figure 4 The sampling device 3 includes a controller 30, which is connected to a plurality of sampling cylinders 31. A piston cover 32 and a sealing sleeve 33 are provided in the sampling cylinder 31. The middle part of the sealing sleeve 33 is convex to seal the inner wall of the sampling cylinder 31. The upper and lower ends of the sealing sleeve 33 are respectively connected to the piston cover 32 and the inner wall of the sampling cylinder 31. A hydraulic rod 34 is fixed in the sampling cylinder 31. The water depth sensor 22 controls the extension and retraction of the hydraulic rod 34 through the controller 30.

[0027] The bracket 20 is suspended in the water by the actuator 21. When the water depth sensor 22 detects no significant change in the water depth, the controller 30 controls the hydraulic rod 34 to extend, causing the piston cap 32 to separate from the sampling tube 31 and simultaneously stretching the sealing sleeve 33. The convex middle portion of the sealing sleeve 33 is deformed under tension, losing its seal against the sampling tube 31. Under the action of water pressure, external water flows into the sampling tube 31 through the gap between the sealing sleeve 33 and the sampling tube 31, achieving sampling. The gap facilitates the passage of water into the sampling tube 31, eliminating the need for a pumping device and saving energy. The annular gap and the arrangement of multiple sampling tubes allow external water to be collected from multiple directions into the sampling tube 31, expanding the sampling range and thus improving the accuracy of carbon dioxide content measurement. When the hydraulic rod 34 is not extended, the piston cap 32 and the sealing sleeve 33 form a double seal on the inner wall of the sampling tube 31, improving the sealing of the water sample after collection, reducing leakage caused by water pressure when the sampling tube 31 rises, and preventing the influence of external high temperature and air pressure on the water sample after landing, effectively preventing large errors in the measurement results.

[0028] A fixing part 4 is provided below the sampling device 3, and the fixing part 4 includes a base 40, an electromagnet 41 and a spring 42. The electromagnet 41 is slidably connected to the base 40 through the spring 42, and the electromagnet 41 is electrically connected to a power supply 43. An iron block 44 is magnetically adsorbed and connected above the electromagnet 41, and a first rope body 45 is fixed to the iron block 44. The first rope body 45 is fixed to the bottom of the controller 30.

[0029] The sampling device 3 is connected to the inner side above the bracket 20 through the fixing part 4. When the mobile device 2 is disturbed by the lateral water flow while hovering, the sampling device 3 pulls the first rope body 45 to drive the iron block 44 and the electromagnet 41 to stretch and compress the spring 42, buffering the shaking to ensure stable sampling while preventing the first rope body 45 from breaking and causing the sampling tube 31 to float up quickly. After the sampling is completed, the power supply 43 stops energizing the electromagnet 41, and the electromagnet 41 releases the iron block 44 to realize the floating of the sampling device 3, thereby improving the recovery and collection efficiency and reducing the load of the bracket 20, thereby reducing the energy consumption of the driver 21 when the bracket 20 rises, saving costs.

[0030] A plurality of filter screens 35 are fixed to the bottom of the sealing sleeve 33 . The meshes of the plurality of filter screens 35 are arranged in an up-down staggered manner. The outer wall of the filter screen 35 is fixed to the inner wall of the sampling tube 31 .

[0031] The filter screen 35 fixes the sealing sleeve 33 and the sampling tube 31, and at the same time forms a two-layer filtration for the water body, so that large particles or dirt are intercepted in the filter screen 35, reducing the particles and dirt remaining in the sampling tube 31 to deteriorate the environment and affect the quality of the water sample. By pushing out the hydraulic rod 34, the particles can be poured out of the sampling tube 31 for cleaning.

[0032] A tension ring 36 is fixed to the inner side of the sealing sleeve 33 , a collar 37 is fixed to the hydraulic rod 34 , and a connecting rod 38 is hinged between the collar 37 and the tension ring 36 . The connecting rod 38 is used to push the tension ring 36 outward along the axis and squeeze the sealing sleeve 33 .

[0033] The hydraulic rod 34 extends to raise the collar 37 and drives the connecting rod 38 and the tensioning ring 36 to leave the sealing sleeve 33 to realize water collection. When the hydraulic rod 34 retracts, the connecting rod 38 straightens so that the tensioning ring 36 supports the convex position of the inner wall of the sealing sleeve 33, thereby improving the sealing effect between the sealing sleeve 33 and the sampling tube 31, reducing the external water pressure and causing the sealing sleeve 33 to concave inward and lose its sealing ability, thereby preventing sample leakage.

[0034] The piston cover 32 and the sealing sleeve 33 form a cavity. The piston cover 32 has multiple through holes 39. A sliding rod 390 is slidably arranged in the through hole 39. One end of the sliding rod 390 is located on the outside of the piston cover 32 and is fixed with an outer baffle 391. The other side of the sliding rod 390 is located in the cavity and is fixed with an inner baffle 392.

[0035] The inner baffle 391 and the outer baffle 392 limit the sliding range of the slide rod 390. The piston cover 32 is pushed out to stretch the sealing sleeve 33. The change in the internal cavity of the sealing sleeve 33 causes the slide rod 390 to slide in the through hole 39, so that the outer baffle 391 is extended outside the piston cover 32, which helps to drive out the organisms or floating plants outside the sampling tube 31. On the one hand, it reduces the organisms staying around to breathe, resulting in a large amount of carbon dioxide in the collected water sample, and ultimately leading to inaccurate measurement results. On the other hand, it prevents organisms or plants from being inhaled and blocked in the sampling tube 31 during sampling, affecting the sampling efficiency. When the organisms hit the outer baffle 391 during the sampling process, the outer baffle 391 drives the slide rod 390 to slide in the through hole 39, causing the inner baffle 392 to squeeze the space in the cavity to increase the air pressure. The sealing sleeve 33 expands due to the increased air pressure and abuts against the sealing sleeve 33 at the convex position to seal, thereby reducing the dirt, mud, etc. carried or raised by the organisms from entering the sampling tube 31 and affecting the quality of the water sample.

[0036] See attached Figure 6A frame assembly 5 is provided above the sampling device 3. The frame assembly 5 includes bearings and connecting columns 51 arranged upper and lower. A plurality of plates 52 are hinged on the side of the connecting column 51. A pull rope 53 is connected between the outer ring of the bearing and the plate 52. A second rope 54 is connected between the controller 30 and the connecting column 51. A third rope 55 is connected between the inner ring of the bearing and the towing device 1.

[0037] When there is water disturbance, the plate 52 swings due to the impact of the water flow, and the bearing moves relative to the connecting column 51, and the plate 52 is pulled to swing by the pull rope 53, thereby consuming the water flow impact on the sampling device 3, improving the sampling stability, and preventing the towing device 1 from shaking on the water surface and causing the second rope 54 to break under tension. At the same time, the swinging frame can generate water fluctuations outward along the axis, preventing the sediment from being suspended and accumulated on the bracket 20 when the bracket 20 sinks to the bottom, making it difficult to recover and rise the mobile device 2, and also facilitating the cleaning of the bracket 20 after recovery. When the mobile device 2 sinks, the plate 52 connected to the outer ring of the bearing by the pull rope 53 can form an inclined upward posture and rotate relative to the third rope 55, consuming the cross-flow impact to reduce the lateral displacement of the mobile device 2, which is conducive to accurate sampling at a designated location to obtain the inorganic carbon content of the target area.

[0038] See attached Figure 1 -Attached Figure 2 The towing device 1 is equipped with a control motor 10, the output shaft of which is connected to a propeller. The towing device 1 is also equipped with a reeling device capable of retracting and extending the third rope 55. When the sampling device 3 is disconnected from the fixing member 4 and freely floats upward, the reeling device reels in the third rope 55, allowing the sampling assembly 3 to be retracted below the towing device 1. The control motor 10 controls the propeller to move the towing device 1 on the water surface. This facilitates the recovery of water samples while maintaining contact with the water and preventing them from being exposed to the water for too long, effectively reducing sample evaporation caused by high temperatures above the water surface.

[0039] A total carbon dioxide monitoring device for a marine ranch, wherein the monitoring method thereof is specifically as follows: step one, deploying a towing device 1 and a mobile device 2, wherein the towing device 1 floats on the water surface and sends a current position signal, and the mobile device 2 sinks; step two, a water depth sensor 22 detects the water depth, and controls the hydraulic rod 34 to extend and retract through a controller 30, so that the piston cover 32 drives the sealing sleeve 33 to deform in the sampling tube 31, thereby realizing water body collection and sealing; step three, after the collection is completed, a power supply 43 cuts off the power to the electromagnet 41 to release the iron block 44, and the sampling device 3 floats up and is stored by a reeling device under the towing device 1, and the collected water sample is recovered by controlling the towing device 1 to move on the water surface; step four, measuring the carbon dioxide content in the water sample, thereby completing the monitoring of the carbon dioxide content in the sampling area.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A marine ranch total carbon dioxide monitoring device, comprising: A towing device (1) and a moving device (2), wherein the towing device (1) floats on the water surface and is provided with a positioner, the moving device (2) is connected below the towing device (1), the moving device (2) comprises a bracket (20), the bracket (20) is connected to a driver (21) and a water depth sensor (22), the water depth sensor (22) is connected to a sampling device (3), the sampling device (3) comprises a controller (30), the controller (30) is connected to a plurality of sampling cylinders (31), a piston cover (32) and a sealing sleeve (33) are provided in the sampling cylinder (31), and the middle portion of the sealing sleeve (33) is convex and faces the inner wall of the sampling cylinder (31). The upper and lower ends of the sealing sleeve (33) are respectively connected to the piston cover (32) and the inner wall of the sampling tube (31). A hydraulic rod (34) is fixed in the sampling tube (31). The water depth sensor (22) controls the telescopic movement of the hydraulic rod (34) through the controller (30). A fixing member (4) is provided below the sampling device (3). The fixing member (4) includes a base (40), an electromagnet (41) and a spring (42). The electromagnet (41) is slidably connected to the base (40) through the spring (42). The electromagnet (41) is electrically connected to a power supply (43). An iron block ( 44), the iron block (44) is fixed with a first rope body (45), the first rope body (45) is fixed to the bottom of the controller (30), a tension ring (36) is fixed on the inner side of the sealing sleeve (33), a collar (37) is fixed on the hydraulic rod (34), a connecting rod (38) is hinged between the collar (37) and the tension ring (36), the connecting rod (38) is used to push the tension ring (36) outward along the axis and squeeze the sealing sleeve (33), the piston cover (32) and the sealing sleeve (33) form a cavity, the piston cover (32) is provided with a plurality of through holes (39), a slide rod (390) is slidably provided in the through hole (39), the One end of the slide rod (390) is located outside the piston cover (32) and is fixed with an outer baffle (391), and the other side of the slide rod (390) is located in the cavity and is fixed with an inner baffle (392). A frame assembly (5) is provided above the sampling device (3), and the frame assembly (5) includes bearings and connecting columns (51) arranged up and down. The connecting column (51) is hinged with multiple plates (52) on the side, and a pull rope (53) is connected between the outer ring of the bearing and the plate (52). A second rope (54) is connected between the controller (30) and the connecting column (51), and a third rope (55) is connected between the inner ring of the bearing and the towing device (1).

2. The marine ranch total carbon dioxide monitoring device according to claim 1, characterized in that: A plurality of filter screens (35) are fixed to the bottom of the sealing sleeve (33), the meshes of the plurality of filter screens (35) are arranged in an up-down staggered manner, and the outer wall of the filter screen (35) is fixed to the inner wall of the sampling tube (31).

3. The marine ranch total carbon dioxide monitoring device according to claim 1, characterized in that: The towing device (1) is provided with a control motor, the output shaft of the control motor is connected to a propeller, and the towing device (1) is also provided with a reeling device capable of retracting and releasing the third rope body (55).

4. A method for monitoring total carbon dioxide in a marine ranch, using the marine ranch total carbon dioxide monitoring device according to claim 3, characterized in that it comprises the following steps: Step 1: deploying the towing device (1) and the mobile device (2), wherein the towing device (1) floats on the water surface and sends a current position signal, and the mobile device (2) sinks; In step 2, the water depth sensor (22) detects the water depth, and controls the hydraulic rod (34) to extend and retract through the controller (30), so that the piston cover (32) drives the sealing sleeve (33) to deform in the sampling tube (31), thereby achieving water collection and sealing; Step three, after the collection is completed, the power supply (43) cuts off the power to the electromagnet (41) to release the iron block (44), and the sampling device (3) floats up and is stored by the winding device under the towing device (1), and the collected water sample is recovered by controlling the towing device (1) to move on the water surface; Step 4: Measure the carbon dioxide content in the water sample to complete the monitoring of the carbon dioxide content in the sampling area.

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