Sampling device and method for seawater at specific horizon of deep sea

Abstract

The invention relates to the technical field of seawater sampling, and discloses a sampling device for deep sea specific layer seawater, the sampling device comprises a supporting bottom plate and a supporting carrier plate, the upper surface of the supporting bottom plate is fixedly provided with a supporting vertical plate, and one side surface of the supporting vertical plate is fixedly provided with a driving assembly; a sampling pump is fixedly installed on one side face of the supporting vertical plate, the input end of the sampling pump is fixedly communicated with an extraction pipe, the output end of the sampling pump is fixedly communicated with a water conveying assembly, a bearing ring is fixedly embedded in one side face of the supporting vertical plate, and a rotary drum is fixedly connected to the inner ring of the bearing ring. According to the sampling device for the seawater at the specific horizon of the deep sea, the whole device does not need to be recycled when the sampling horizon is switched, the depth can be adjusted only by winding and unwinding the hose through the rotary drum, and in addition, flexible adjustment can be realized according to different horizon temperature characteristics of the deep sea to ensure that the temperature difference between the temperature in the cavity and the sampling horizon environment is controlled within a proper range; and reliable sample support can be provided for environmental change monitoring.

Description

Technical Field

[0001] This invention relates to the field of seawater sampling technology, specifically to a sampling device and method for seawater at a specific layer in the deep sea. Background Technology

[0002] Seawater sampling is a core foundational technology for marine environmental research, resource exploration, and ecological monitoring. Specialized sampling equipment is used to obtain seawater samples from different sea areas and depths, allowing for the analysis of their physical properties, chemical composition, and biological communities. This provides crucial data support for marine carbon cycle research, microbial resource development, and environmental change monitoring. Different vertical strata form unique environmental systems due to differences in light, temperature, and pressure; accurately obtaining seawater samples from specific strata is a prerequisite for understanding deep-sea ecological processes. However, existing conventional sampling techniques have limitations: 1. Existing sampling devices for specific deep-sea water layers take the mainstream sampling bottle as an example. The sampler must first be lowered to the target depth via cable to trigger the collection, and then retrieved to the deck before the sample can be taken out. If multiple samples from different layers need to be collected, the lowering and retrieval process must be repeated, which is time-consuming and labor-intensive, and reduces the sampling speed of specific deep-sea water layers. 2. Existing sampling devices for specific deep-sea seawater layers typically maintain a stable low-temperature environment. However, conventional sampling devices lack efficient heat preservation structures. After samples are recovered from the deep sea to the deck, it is difficult to keep them warm. Sudden temperature increases can easily lead to changes in composition, such as fluctuations in dissolved oxygen concentration, and even changes in microbial metabolic activity, directly affecting the accuracy of subsequent detection data. Therefore, this invention provides a sampling device and method for specific deep-sea seawater layers. Summary of the Invention

[0003] This invention provides a sampling device and method for seawater at specific deep-sea layers, solving the problems of current methods that require lowering the sampler to the target depth via cable to trigger collection, and then retrieving it back to the deck before the sample can be retrieved. If multiple samples from different layers need to be collected, the lowering and retrieval process must be repeated, which is time-consuming and labor-intensive. Furthermore, it is difficult to keep the samples warm after they are retrieved from the deep sea to the deck, as the composition is easily changed due to a sudden increase in temperature.

[0004] This invention provides the following technical solution: a sampling device for seawater at a specific depth in the deep sea, comprising a supporting base plate and a supporting carrier plate. A supporting upright plate is fixedly installed on the upper surface of the supporting base plate. A driving assembly is fixedly installed on one side of the supporting upright plate. A sampling pump is fixedly installed on one side of the supporting upright plate. An extraction tube is fixedly connected to the input end of the sampling pump. A water delivery assembly is fixedly connected to the output end of the sampling pump. A bearing ring is fixedly embedded on one side of the supporting upright plate. A rotating cylinder is fixedly connected to the inner ring of the bearing ring. A circular hole is opened in the inner ring of the rotating cylinder. A sampling hose is fixedly connected to the bottom end of the circular hole. A water inlet filter head is fixedly connected to the bottom end of the sampling hose. A sensing plate is fixedly connected to one side of the sampling hose. A depth sensor is fixedly installed on one side of the sensing plate.

[0005] The upper surface of the support plate is fixedly connected to an outer heat-insulating cover and an inner heat-insulating cover. The inner heat-insulating cover is located inside the outer heat-insulating cover. A cooling plate is fixedly embedded on the outer surface of the outer heat-insulating cover. The cooling surface of the cooling plate is in contact with the outer surface of the inner heat-insulating cover. An electric heating wire is fixedly embedded inside the outer heat-insulating cover. A heat-insulating cavity is provided between the outer heat-insulating cover and the inner heat-insulating cover. Multiple partitions are fixedly installed on the inner wall of the inner heat-insulating cover.

[0006] As a preferred embodiment of the present invention, the water supply assembly includes a water supply pipe fixedly connected to the output end of a sampling pump. A set of water injection pipes are fixedly connected to the outer surface of the water supply pipe. The bottom end of each water injection pipe passes through the outer insulation cover and the inner insulation cover in sequence and extends into the interior of the inner insulation cover. The water injection pipe is located on one side of the partition. A pretreatment valve is fixedly connected to the outer surface of the water supply pipe.

[0007] As a preferred embodiment of the present invention, each of the water injection pipes is fixedly connected to a water injection solenoid valve on its outer surface, a plurality of liquid level sensors are fixedly installed on the inner top wall of the heat insulation cover, a plurality of discharge pipes are provided inside the heat insulation cover, the bottom end of each discharge pipe passes through the support plate and extends to the bottom of the support plate, and the outer surface of the discharge pipe is fixedly connected to a discharge solenoid valve.

[0008] As a preferred embodiment of the present invention, the driving assembly includes a driving cover fixedly installed on one side of a supporting plate, a driving motor fixedly installed on one side of the driving cover, a worm gear fixedly installed at the output end of the driving motor, a worm wheel fixedly connected to the outer surface of the rotating cylinder, the outer surface of the worm gear meshing with the outer surface of the worm wheel, and two bearing rings fixedly embedded in the inner wall of the driving cover, the inner rings of the two bearing rings being fixedly connected to the outer surface of the worm gear.

[0009] As a preferred embodiment of the present invention, one end of the extraction tube penetrates through the drive cover and extends into the interior of the rotating cylinder. A sealed bearing is fixedly connected to the inner ring of the rotating cylinder, and the inner ring of the sealed bearing is fixedly connected to the outer surface of one end of the extraction tube.

[0010] As a preferred embodiment of the present invention, a threaded fixing ring is fixedly connected to one side of the supporting plate, and a protective cover is threadedly connected to the inner ring of the threaded fixing ring, with the rotating cylinder located inside the protective cover.

[0011] As a preferred embodiment of the present invention, the bottom surface of the support plate is fixedly installed on the upper surface of the support base plate, and two sets of mounting components are fixedly installed on the bottom surface of the support base plate.

[0012] As a preferred embodiment of the present invention, a counterweight positioning component is fixedly installed on the upper surface of the water inlet filter head, and a controller is fixedly installed on one side of the heat insulation cover.

[0013] As a preferred embodiment of the present invention, a sampling method for a sampling device for seawater at a specific deep-sea layer includes the following steps: S1. After the device is fixed on the work platform, the drive assembly is started, which enables the drum to rotate around the bearing ring to unwind the sampling hose. The counterweight positioning piece at the bottom of the sampling hose assists in its vertical sinking. S2, the depth sensor on the sensing plate detects depth data in real time and transmits it to the controller. When the target layer is reached, the controller shuts down the drive component to complete the depth positioning. S3, the sampling pump extracts seawater from the target layer through the extraction pipe, the circular hole of the rotating drum and the sampling hose. The seawater is transported through the water delivery component at the output end of the sampling pump. The water injection solenoid valve on the water delivery pipe is opened according to the command, and the seawater is injected into the corresponding chamber of the heat preservation inner cover through the water injection pipe. S4, the cooling pads or electric heating wires inside the insulation cover are activated to maintain a stable temperature inside the insulation cavity and prevent changes in sample composition.

[0014] The present invention has the following beneficial effects: 1. This sampling device for specific deep-sea seawater layers uses a drive motor to engage a worm gear with a worm wheel outside the rotating drum. This allows the rotating drum to stably unwind the sampling hose around the bearing ring. A counterweight positioning component ensures the hose descends vertically, preventing depth errors caused by skewing. Additionally, a depth sensor on the sensing plate collects depth data in real time and transmits it to the controller. Once the target layer is reached, the drive assembly is immediately shut off. Furthermore, switching sampling layers does not require retrieving the entire device; depth can be adjusted simply by winding and unwinding the hose on the rotating drum. A pretreatment valve quickly empties residual samples from the water delivery pipe, effectively preventing cross-contamination and reducing multi-layer sampling time by more than 60%, thus improving the continuity and convenience of deep-sea operations.

[0015] 2. This sampling device for seawater at specific deep-sea layers forms a sealed, insulated cavity through an outer insulated cover and an inner insulated cover. This allows the cooling element to directly adhere to the outer wall of the inner insulated cover for rapid cooling. The electric heating wire can be flexibly adjusted according to the temperature characteristics of different deep-sea layers, ensuring that the temperature difference between the cavity and the sampling layer environment is controlled within a suitable range. The inner insulated cover is divided into independent chambers by partitions. With the help of a water injection solenoid valve and a liquid level sensor, quantitative sampling can be achieved in a single chamber, avoiding interference from the mixing of samples from different layers. At the same time, the water inlet filter head can pre-filter seawater impurities to prevent pipeline blockage from affecting sampling stability. The design of the sealed bearing and the rotating drum ensures that seawater components do not come into contact with the outside environment during the extraction process. Therefore, this device maintains the original state of the sample throughout the entire process from sampling, transmission to storage, avoiding the risks of temperature fluctuations and contamination, and can provide reliable sample support for environmental change monitoring. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a frontal three-dimensional structural schematic diagram of a sampling device for seawater at a specific deep-sea layer according to the present invention; Figure 2 This is a frontal cross-sectional view of a sampling device for seawater at a specific deep-sea layer according to the present invention; Figure 3 This is a sectional view of the drive cover from the side. Figure 4 A cross-sectional view of the drive cover from the front; Figure 5 A cross-sectional view of the thermal insulation inner cover taken from below; Figure 6 A three-dimensional structural diagram of the rotating drum viewed from the front; Figure 7 This is a flowchart of a sampling method for a sampling device targeting seawater at a specific depth in the deep sea.

[0018] In the diagram: 1. Support base plate; 2. Support upright plate; 3. Drive assembly; 31. Drive cover; 32. Drive motor; 33. Worm gear; 34. Bearing ring; 35. Worm wheel; 4. Sampling pump; 5. Extraction pipe; 6. Water supply assembly; 61. Water supply pipe; 62. Water injection pipe; 63. Water injection solenoid valve; 64. Pretreatment valve; 7. Insulation outer cover; 8. Sampling hose; 9. Induction plate; 10. Depth sensor; 11. Rotary drum; 12. Sealed bearing; 13. Bearing ring; 14. Circular hole; 15. Protective cover; 16. Threaded retaining ring; 17. Counterweight positioning component; 18. Inlet filter head; 19. Controller; 20. Support carrier plate; 21. Cooling element; 22. Insulation inner cover; 23. Electric heating wire; 24. Discharge pipe; 25. Liquid level sensor; 26. Partition plate; 27. Mounting component. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-7 A sampling device for seawater at specific deep-sea layers includes a supporting base plate 1 and a supporting carrier plate 20. A supporting upright plate 2 is fixedly installed on the upper surface of the supporting base plate 1. A driving assembly 3 is fixedly installed on one side of the supporting upright plate 2. A sampling pump 4 is fixedly installed on one side of the supporting upright plate 2. An extraction tube 5 is fixedly connected to the input end of the sampling pump 4. A water delivery assembly 6 is fixedly connected to the output end of the sampling pump 4. A bearing ring 13 is fixedly embedded on one side of the supporting upright plate 2. A rotating cylinder 11 is fixedly connected to the inner ring of the bearing ring 13. A circular hole 14 is opened in the inner ring of the rotating cylinder 11. A sampling hose 8 is fixedly connected to the bottom end of the circular hole 14. The bottom end of the sampling hose 8 is fixedly connected to... The sampling hose 8 has an inlet filter head 18, and a sensing plate 9 is fixedly connected to one side of the sampling hose 8. A depth sensor 10 is fixedly installed on one side of the sensing plate 9. Specifically, the support plate 20 supports the heat preservation and storage components, the support plate 2 is used to fix the drive assembly 3, the sampling pump 4 and the bearing ring 13, and the depth sensor 10 is installed on the sampling hose 8 through the sensing plate 9 to monitor the sampling depth in real time and ensure accurate positioning of specific deep-sea layers. The inlet filter head 18 filters seawater debris, and the counterweight positioning component 17 ensures that the sampling hose 8 sinks stably to the target layer. The rotating drum 11 rotates through the bearing ring 13 and adjusts the descent depth of the sampling hose 8 with the help of the circular hole 14.

[0021] The upper surface of the support plate 20 is fixedly connected to an outer heat-insulating cover 7 and an inner heat-insulating cover 22. The inner heat-insulating cover 22 is located inside the outer heat-insulating cover 7. A cooling plate 21 is fixedly embedded on the outer surface of the outer heat-insulating cover 7. The cooling surface of the cooling plate 21 is in contact with the outer surface of the inner heat-insulating cover 22. An electric heating wire 23 is fixedly embedded inside the outer heat-insulating cover 7. A heat-insulating cavity is provided between the outer heat-insulating cover 7 and the inner heat-insulating cover 22. Multiple partitions 26 are fixedly installed on the inner wall of the inner heat-insulating cover 22. Specifically, the outer heat-insulating cover 7 and the inner heat-insulating cover 22 form a heat-insulating cavity. The cooling plate 21 cools the inner heat-insulating cover 22, and the electric heating wire 23 can adjust the temperature. Together, they maintain a stable temperature environment required for sample storage. The partitions 26 divide the inner heat-insulating cover 22 into multiple independent spaces to achieve classified storage of different samples.

[0022] In a preferred embodiment, the water delivery assembly 6 includes a water delivery pipe 61 fixedly connected to the output end of the sampling pump 4. A set of water injection pipes 62 are fixedly connected to the outer surface of the water delivery pipe 61. The bottom end of each water injection pipe 62 passes through the outer insulation cover 7 and the inner insulation cover 22 in sequence and extends into the interior of the inner insulation cover 22. The water injection pipes 62 are located on one side of the partition 26. A pretreatment valve 64 is fixedly connected to the outer surface of the water delivery pipe 61. A water injection solenoid valve 63 is fixedly connected to the outer surface of each water injection pipe 62. Multiple liquid level sensors 25 are fixedly installed on the inner top wall of the inner insulation cover 22. Multiple discharge pipes are provided inside the inner insulation cover 22. 24. The bottom end of each discharge pipe 24 penetrates through the support plate 20 and extends to the bottom of the support plate 20. The outer surface of the discharge pipe 24 is fixedly connected to a discharge solenoid valve. Specifically, the sampling pump 4 extracts seawater from the target layer through the extraction pipe 5. The water supply assembly 6 is responsible for seawater transportation and storage. The water supply pipe 61 receives the seawater output by the sampling pump 4. The pretreatment valve 64 is used for pipeline pretreatment control. The water injection pipe 62 diverts the seawater to the heat-insulating inner cover 22. The water injection solenoid valve 63 controls the opening and closing of each water injection pipe 62. The liquid level sensor 25 monitors the seawater level in the heat-insulating inner cover 22. The discharge pipe 24 and the matching discharge solenoid valve realize sample discharge.

[0023] In a preferred embodiment, the drive assembly 3 includes a drive cover 31 fixedly mounted on one side of the support plate 2, a drive motor 32 fixedly mounted on one side of the drive cover 31, a worm gear 33 fixedly mounted on the output end of the drive motor 32, a worm wheel 35 fixedly connected to the outer surface of the rotating drum 11, the outer surface of the worm gear 33 meshing with the outer surface of the worm wheel 35, and two bearing rings 34 fixedly embedded in the inner wall of the drive cover 31, the inner rings of the two bearing rings 34 being fixedly connected to the outer surface of the worm gear 33. Specifically, in the drive assembly 3, the drive cover 31 protects the internal components, the drive motor 32 provides power output to drive the worm gear 33 to rotate, the bearing rings 34 ensure the smooth operation of the worm gear 33, and the worm gear 33 meshes with the worm wheel 35 to drive the rotating drum 11 to rotate, thereby adjusting the sampling depth of the sampling hose 8.

[0024] In a preferred embodiment, one end of the extraction tube 5 passes through the drive cover 31 and extends into the interior of the rotating drum 11. A sealed bearing 12 is fixedly connected to the inner ring of the rotating drum 11. The inner ring of the sealed bearing 12 is fixedly connected to the outer surface of one end of the extraction tube 5. A threaded retaining ring 16 is fixedly connected to one side of the support plate 2. A protective cover 15 is threadedly connected to the inner ring of the threaded retaining ring 16. The rotating drum 11 is located inside the protective cover 15. The bottom surface of the support plate 20 is fixedly installed to the upper surface of the support base plate 1. Two sets of mounting parts 27 are fixedly installed on the bottom surface of the support base plate 1. A counterweight positioning part 17 is fixedly installed on the upper surface of the water inlet filter head 18. A controller 19 is fixedly installed on one side of the insulation cover 7. Specifically, the sealed bearing 12 is fixedly connected to the inner ring of the rotating drum 11. The sealing bearing 12 achieves a sealed rotational connection between the extraction tube 5 and the rotating drum 11. The protective cover 15 is installed through the threaded fixing ring 16 to protect the rotating drum 11 and other components. The mounting part 27 facilitates the overall fixation of the device. The controller 19 receives signals from the depth sensor 10 and the liquid level sensor 25, and coordinates the operation of the drive component 3, the sampling pump 4, and various solenoid valves to achieve automated control of the entire sampling process. The depth sensor 10, such as the CTD probe, is based on the pressure conversion principle. The controller 19 is a dedicated industrial type that receives sensor signals and coordinates the operation of components. The cooling chip 21 is selected as TEC1-12706, which relies on the semiconductor temperature difference effect for cooling. The liquid level sensor 25, such as LK1023, uses the capacitive principle to monitor the sample liquid level.

[0025] Please see Figure 7 The present invention also provides a sampling method for seawater at specific deep-sea layers, comprising the following steps: S1. After the device is fixed on the working platform, the drive assembly 3 is started, which enables the rotating drum 11 to rotate around the bearing ring 13 to unwind the sampling hose 8. The counterweight positioning piece 17 at the bottom of the sampling hose 8 assists in its vertical sinking. S2. The depth sensor 10 on the sensing plate 9 detects the depth data in real time and transmits it to the controller 19. When the target layer is reached, the controller 19 shuts down the drive assembly 3 to complete the depth positioning. S3. The sampling pump 4 extracts seawater from the target layer through the extraction pipe 5, the circular hole 14 of the rotating drum 11 and the sampling hose 8. The seawater is transported through the water delivery assembly 6 at the output end of the sampling pump 4. The water injection solenoid valve 63 on the water delivery pipe 61 is opened according to the command. The seawater is injected into the corresponding chamber of the heat-insulating inner cover 22 through the water injection pipe 62. S4. The cooling chip 21 or electric heating wire 23 in the heat-insulating outer cover 7 is activated to maintain a stable temperature in the heat-insulating cavity and avoid changes in the sample composition.

[0026] Working principle: First, the device is fixed to the working platform by the mounting part 27 of the support base plate 1. Then, the controller 19 starts the drive assembly 3, and the drive motor 32 drives the worm 33 to rotate. The worm 33 meshes with the worm wheel 35 on the surface of the rotating drum 11, which enables the rotating drum 11 to rotate around the bearing ring 13 to unwind the sampling hose 8. The counterweight positioning part 17 at the bottom of the sampling hose 8 assists it to sink vertically. The depth sensor 10 on the sensing plate 9 detects the depth data in real time and transmits it to the controller 19. When the target layer is reached, the controller 19 shuts down the drive assembly 3 to complete the depth positioning. During this process, the water inlet filter head 18 can filter seawater debris to avoid pipe blockage.

[0027] After depth positioning, the controller 19 starts the sampling pump 4 to extract seawater from the target layer through the extraction tube 5, the circular hole 14 of the rotating drum 11, and the sampling hose 8. The seawater is transported through the water delivery component 6 at the output end of the sampling pump 4. The water injection solenoid valve 63 on the water delivery pipe 61 is opened according to the command. The seawater is injected into the corresponding chamber of the heat-insulating inner cover 22 through the water injection pipe 62 and separated by the partition 26. The cooling chip 21 or electric heating wire 23 in the heat-insulating outer cover 7 is activated to maintain a stable temperature in the heat-insulating cavity and avoid changes in sample composition. After the liquid level sensor 25 detects that the chamber is full of liquid, the controller 19 is fed back to close the corresponding solenoid valve. When collecting samples from different layers, the pretreatment valve 64 is opened first to drain the residual sample in the water delivery pipe 61, and then the depth positioning and collection process is repeated. After completion, the sample can be removed through the solenoid valve of the discharge pipe 24.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sampling device for seawater at a specific deep-sea layer, comprising a supporting base plate (1) and a supporting carrier plate (20), characterized in that: A support plate (2) is fixedly installed on the upper surface of the support base plate (1). A drive assembly (3) is fixedly installed on one side of the support plate (2). A sampling pump (4) is fixedly installed on one side of the support plate (2). An extraction tube (5) is fixedly connected to the input end of the sampling pump (4). A water delivery assembly (6) is fixedly connected to the output end of the sampling pump (4). A bearing ring (13) is fixedly embedded on one side of the support plate (2). A rotating cylinder (11) is fixedly connected to the inner ring of the bearing ring (13). A circular hole (14) is opened in the inner ring of the rotating cylinder (11). A sampling hose (8) is fixedly connected to the bottom end of the circular hole (14). A water inlet filter head (18) is fixedly connected to the bottom end of the sampling hose (8). A sensing plate (9) is fixedly connected to one side of the sampling hose (8). A depth sensor (10) is fixedly installed on one side of the sensing plate (9). The upper surface of the support plate (20) is fixedly connected to an outer heat-insulating cover (7) and an inner heat-insulating cover (22). The inner heat-insulating cover (22) is located inside the outer heat-insulating cover (7). A cooling chip (21) is fixedly embedded on the outer surface of the outer heat-insulating cover (7). The cooling surface of the cooling chip (21) is in contact with the outer surface of the inner heat-insulating cover (22). An electric heating wire (23) is fixedly embedded inside the outer heat-insulating cover (7). A heat-insulating cavity is provided between the outer heat-insulating cover (7) and the inner heat-insulating cover (22). Multiple partitions (26) are fixedly installed on the inner wall of the inner heat-insulating cover (22).

2. The sampling device for seawater at a specific deep-sea layer according to claim 1, characterized in that: The water delivery assembly (6) includes a water delivery pipe (61) fixedly connected to the output end of the sampling pump (4). A set of water injection pipes (62) are fixedly connected to the outer surface of the water delivery pipe (61). The bottom end of each water injection pipe (62) passes through the outer insulation cover (7) and the inner insulation cover (22) in sequence and extends into the interior of the inner insulation cover (22). The water injection pipe (62) is located on one side of the partition (26). A pretreatment valve (64) is fixedly connected to the outer surface of the water delivery pipe (61).

3. A sampling device for seawater at a specific deep-sea layer according to claim 2, characterized in that: Each of the water injection pipes (62) has a water injection solenoid valve (63) fixedly connected to its outer surface. Multiple liquid level sensors (25) are fixedly installed on the inner top wall of the heat insulation inner cover (22). Multiple discharge pipes (24) are provided inside the heat insulation inner cover (22). The bottom end of each discharge pipe (24) passes through the support plate (20) and extends to the bottom of the support plate (20). The outer surface of the discharge pipe (24) is fixedly connected to a discharge solenoid valve.

4. The sampling device for seawater at a specific deep-sea layer according to claim 1, characterized in that: The drive assembly (3) includes a drive cover (31) fixedly installed on one side of the support plate (2), a drive motor (32) fixedly installed on one side of the drive cover (31), a worm (33) fixedly installed at the output end of the drive motor (32), and a worm wheel (35) fixedly connected to the outer surface of the rotating drum (11), with the outer surface of the worm (33) meshing with the outer surface of the worm wheel (35).

5. A sampling device for seawater at a specific deep-sea layer according to claim 4, characterized in that: The inner wall of the drive cover (31) is fixedly inlaid with two bearing rings (34), and the inner rings of the two bearing rings (34) are fixedly connected to the outer surface of the worm (33).

6. A sampling device for seawater at a specific deep-sea layer according to claim 4, characterized in that: One end of the extraction tube (5) passes through the drive cover (31) and extends into the interior of the rotating drum (11). The inner ring of the rotating drum (11) is fixedly connected to a sealed bearing (12), and the inner ring of the sealed bearing (12) is fixedly connected to the outer surface of one end of the extraction tube (5).

7. A sampling device for seawater at a specific deep-sea layer according to claim 1, characterized in that: A threaded retaining ring (16) is fixedly connected to one side of the support plate (2), and a protective cover (15) is threadedly connected to the inner ring of the threaded retaining ring (16). The rotating cylinder (11) is located inside the protective cover (15).

8. A sampling device for seawater at a specific deep-sea layer according to claim 1, characterized in that: The bottom surface of the support plate (20) is fixedly installed on the upper surface of the support base plate (1), and two sets of mounting parts (27) are fixedly installed on the bottom surface of the support base plate (1).

9. A sampling device for seawater at a specific deep-sea layer according to claim 1, characterized in that: A counterweight positioning component (17) is fixedly installed on the upper surface of the water inlet filter head (18), and a controller (19) is fixedly installed on one side of the heat insulation cover (7).

10. The sampling method of the sampling device for seawater at a specific layer in the deep sea according to any one of claims 1-9, characterized in that, Includes the following steps: S1, after the device is fixed on the work platform, start the drive assembly (3), which enables the drum (11) to rotate around the bearing ring (13) to unwind the sampling hose (8), and the counterweight positioning piece (17) at the bottom of the sampling hose (8) assists it to sink vertically. S2, the depth sensor (10) on the sensing plate (9) detects depth data in real time and transmits it to the controller (19). When the target layer is reached, the controller (19) shuts down the drive component (3) to complete the depth positioning. S3, the sampling pump (4) extracts seawater from the target layer through the extraction pipe (5), the circular hole (14) of the rotating drum (11) and the sampling hose (8). The seawater is transported through the water delivery assembly (6) at the output end of the sampling pump (4). The water injection solenoid valve (63) on the water delivery pipe (61) is opened according to the instruction, and the seawater is injected into the corresponding chamber of the heat preservation inner cover (22) through the water injection pipe (62). S4, the cooling chip (21) or electric heating wire (23) inside the heat insulation cover (7) is activated to maintain a stable temperature in the heat insulation cavity and avoid changes in sample composition.

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