A portable deep-sea sediment pore water sampling device based on rov

Abstract

This invention relates to a portable deep-sea sediment pore water sampling device based on an ROV, comprising a mounting plate with an installation groove, and a multi-way valve head with an inlet connection hole and a transfer hole. A pin is installed in the mounting groove, with an inlet and an outlet. A unidirectional filter membrane is installed at the inlet. One side opening of both the inlet connection hole and the transfer hole extends circumferentially into the multi-way valve head, while the other side opening extends axially. The circumferential opening of the inlet connection hole is connected to a water storage pipeline, and the circumferential opening of the transfer hole is connected to a pumping module. A turntable is connected to the multi-way valve head, and a groove is formed on the turntable. The axial opening of the inlet connection hole and the axial opening of the transfer hole are connected through the groove. This invention, through integrated structural design, low-disturbance sampling architecture, multi-channel independent control, and a full-ocean-depth adaptable system, can obtain high-quality pore water samples that are multi-layered, airtight, pollution-free, and possess in-situ characteristics.

Description

Technical Field

[0001] This invention relates to the field of deep-sea engineering equipment technology, specifically to a portable deep-sea sediment pore water sampling device based on ROV. Background Technology

[0002] Seafloor sediment pore water (interstitial water) is water that exists in the pores of sediments. It serves as a link between sedimentary layers and the upper water layer, and is rich in chemical substances and biomarkers. Its study is of great significance for understanding the function of marine ecosystems, biogeochemical cycles, sediment diagenesis, and global climate change. Changes in the chemical composition of pore water can also serve as an indicator of environmental change and pollution, providing key information for marine environmental monitoring and resource exploration. Therefore, the development of in-situ pore water sampling technology is an inevitable product of responding to the needs of marine scientific research.

[0003] Although advancements in deep-sea exploration technology have enabled scientists to delve deeper using equipment such as ROVs and AUVs, obtaining high-quality pore water samples for subsequent analysis remains a technical challenge. Avoiding contamination and compositional changes during sample extraction and transportation is crucial for accurate assessment and research of the deep-sea environment. To obtain a large number of multi-layered, airtight, and uncontaminated pore water samples with in-situ characteristics, in-situ sampling techniques and related equipment for deep-sea sediment pore water have been widely applied. In-situ sampling techniques can maximize the preservation of sample integrity during the sampling process, preventing contamination or changes in internal composition.

[0004] However, existing in-situ pore water sampling devices have drawbacks such as large device size, large in-situ disturbance, heavy weight, complex operation, inconvenience of carrying, and inability to store samples independently. Therefore, there is an urgent need in this field to develop a deep-sea sediment pore water sampling device that is lightweight, has low disturbance, is easy to operate, is easy to carry, and allows for independent sample storage. Summary of the Invention

[0005] The purpose of this invention is to provide a portable deep-sea sediment pore water sampling device based on ROV to address the shortcomings of existing technologies. This device is lightweight, causes minimal disturbance, is easy to operate and carry, and has an independent sample storage function. It solves the core technical problems of traditional pore water sampling devices, such as bulky size, large in-situ disturbance, easy sample contamination and mixing, complex operation, and poor deep-sea adaptability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A portable deep-sea sediment pore water sampling device based on ROV includes a mounting plate with a mounting groove and a multi-way valve head with an inlet connection hole and a transfer hole. A pin is provided in the mounting groove, and the pin has an inlet that communicates with the outside of the mounting plate and an outlet that is connected to one end of a water storage pipeline. A one-way filter membrane is provided at the inlet. One side opening of the inlet connection hole and the transfer hole extends circumferentially to the multi-way valve head, and the other side opening extends axially to the multi-way valve head. The circumferential opening end of the inlet connection hole is connected to the other end of the water storage pipeline. The circumferential opening end of the transfer hole is connected to a pumping module for providing pumping power. A turntable is connected to one side of the multi-way valve head, and a groove is provided on the turntable. The axial opening end of the inlet connection hole and the axial opening end of the transfer hole are connected through the groove. The turntable is connected to a first rotating component. One end of the groove is located at the rotation center of the turntable, and the other end of the groove extends along the circumference of the turntable. A water outlet connection hole is also provided on the multi-way valve head. The water outlet connection hole and the water inlet connection hole are spaced apart from each other in the circumference of the multi-way valve head. One side of the water outlet connection hole extends in the circumference of the multi-way valve head, and the other side extends in the axial direction of the multi-way valve head. The turntable is driven to rotate by the first rotating component, so that the groove on the turntable connects the transfer hole and any connection hole.

[0007] Furthermore, there are multiple water inlet connection holes, which are spaced apart on the circumference of the multi-way valve head, and there are multiple mounting slots on the mounting plate, pins in the mounting slots, and water storage pipelines connected to the pins.

[0008] Furthermore, the plurality of mounting slots are respectively spaced apart from each other in the vertical direction of the mounting plate.

[0009] Furthermore, the water inlet is located circumferentially on the pin, and the water outlet is located on one axial end of the pin. A connecting port for connecting the water inlet to the outside of the mounting plate is provided on the side of the mounting plate.

[0010] Furthermore, the pumping module includes a piston cylinder connected to the circumferentially open end of the transfer hole. A piston is movably connected inside the piston cylinder, and a piston rod is connected to the piston. By driving the piston to move inside the piston cylinder, water can be pumped into the piston cylinder or drained out of the piston cylinder. A drive mechanism for driving the piston to move inside the piston cylinder is connected to one end of the piston rod that passes through the piston cylinder.

[0011] Furthermore, the drive mechanism includes a ball screw and a screw nut connected to the ball screw. The screw nut is connected to a piston rod, and the ball screw is connected to a second rotating assembly for driving the ball screw to rotate.

[0012] Furthermore, the second rotating assembly includes a first synchronous pulley connected to a ball screw, a second synchronous pulley connected to the first synchronous pulley via a synchronous belt, and a second motor connected to the second synchronous pulley.

[0013] Furthermore, the first rotating assembly includes a first motor connected to the turntable.

[0014] Furthermore, it also includes an electronic integrated compartment, with the first and second motors located inside the electronic integrated compartment, and the multi-way valve head, ball screw, first synchronous pulley, synchronous belt, and second synchronous pulley located outside the electronic integrated compartment.

[0015] This invention solves the core technical problems of traditional pore water sampling devices—bulky size, large in-situ disturbance, easy sample contamination and mixing, complex operation, and poor deep-sea adaptability—through integrated structural design, low-disturbance sampling architecture, multi-channel independent control, and a full-ocean-depth adaptable system. It can obtain high-quality pore water samples that are multi-layered, airtight, uncontaminated, and possess in-situ characteristics. Specific beneficial effects are as follows: 1. Highly integrated and lightweight design significantly improves portability and ROV adaptability. This invention integrates the first motor, second motor, power supply battery pack, and control circuit board into a single electronic integrated compartment, abandoning the traditional multi-compartment layout with messy pipelines, and greatly reducing the overall size and weight of the device. At the same time, the electronic integrated compartment adopts an internal pressure balance design with silicone oil filling and external flexible compensators, which can adapt to the high-pressure environment at all ocean depths without relying on a heavy, high-strength, pressure-resistant metal compartment, further realizing the lightweighting of the equipment and facilitating on-site handling, installation, and ROV mounting operations. In addition, the electronic integrated compartment adopts an electromechanical separation layout, placing the motion actuators (multi-way valve head, ball screw, synchronous pulley set) on the outside of the compartment, which not only avoids interference from moving parts to the electrical system inside the compartment, but also simplifies the compartment sealing structure, reduces the difficulty of equipment maintenance, and makes the overall structure more compact, adapting to the mounting space requirements of different ROV models.

[0016] 2. Low-disturbance, large-area sampling structure ensures in-situ sample characteristics and collection efficiency. The mounting plate of this invention is made of non-metallic materials, eliminating interference with sample composition caused by chemical reactions between metallic materials and pore water, thus ensuring the accuracy of sample chemical analysis. The mounting plate is equipped with multiple mounting slots spaced 2cm apart vertically, enabling simultaneous and precise sampling of sediment layers at different depths, meeting the needs of marine scientific research for multi-layer pore water comparative analysis. The probe employs a circumferential water inlet and axial water outlet design, coupled with connecting ports on both sides of the mounting plate. This allows the probe, except for the fixed ends, to fully contact both sides of the sediment, significantly increasing the effective filtration area (by more than double) compared to traditional single-end sampling probes. Simultaneously, a unidirectional filter membrane is installed at the probe inlet, filtering sediment particles to prevent pipe blockage and enabling unidirectional pore water flow. This prevents contamination and component loss caused by sample backflow after suction stops, ensuring the in-situ characteristics of the sample. Furthermore, the probe's overall narrow diameter and lightweight design, combined with the low-resistance insertion structure of the mounting plate, significantly reduces physical disturbance to the sediment during sampling, preventing cross-mixing of pore water from different depths and ensuring that the collected sample accurately reflects the geological and chemical characteristics of the corresponding stratum.

[0017] 3. Multiple independent channels and a precise switching system effectively prevent cross-contamination of samples. The multi-channel valve head of this invention features multiple circumferentially spaced water inlet connection holes, each corresponding to an independent needle and water storage line, forming multiple completely independent sampling channels. The pore water sample from each channel is stored separately in a Teflon tube, completely avoiding cross-mixing of samples from different layers or points. A first motor drives the turntable to rotate, utilizing grooves on the turntable to achieve single-channel connection between the transfer hole and any one of the water inlet or outlet connection holes. Only one sampling channel can be activated at a time. Combined with precise feedback from a photoelectric sensor on the turntable's rotation angle, the accuracy and reliability of channel switching are ensured. Simultaneously, after extraction, the deionized water in the piston cylinder is discharged separately through the outlet connection hole, preventing contact with the pore water sample in the water storage line, further ensuring sample purity.

[0018] 4. High-precision controllable extraction system enhances the stability and reliability of the sampling process. The extraction module of this invention employs a ball screw and synchronous pulley transmission structure, powered by a second motor. Compared to traditional hydraulic or pneumatic extraction systems, it offers higher transmission precision and smoother operation. The extraction rate can be precisely adjusted by controlling the motor speed, avoiding damage to the sediment pore structure and changes in sample composition caused by sudden changes in extraction pressure. A photoelectric sensor is installed at the end of the ball screw, providing real-time feedback on the displacement step of the screw nut, thereby precisely controlling the piston's extraction volume for quantitative sampling. Simultaneously, a limit rod limits the movement of the screw nut, preventing overtravel of the piston and damage to the equipment, thus improving the stability and lifespan of the device. The entire extraction and channel switching process can be remotely controlled by a host computer, achieving automated sampling without manual intervention. This reduces the operational difficulty and risk of deep-sea operations while ensuring the standardization and repeatability of the sampling process.

[0019] 5. A fully sealed design adaptable to all ocean depths ensures sample integrity and adaptability to extreme environments. The water storage pipeline of this invention employs a multi-stage sealing connection structure consisting of Luer joints, internally threaded straight cylinder joints, and inverted conical joints. Before deployment, a leak test can be performed by pre-filling with deionized water to thoroughly eliminate air from the pipeline, preventing insufficient sampling volume and sample contamination caused by air compression under deep-sea pressure. The Teflon tubing possesses excellent corrosion resistance and low adsorption properties, and will not react with chemicals in pore water, ensuring the long-term stability of sample components. The internal and external pressure compensation design of the electronic integrated chamber maintains a constant pressure balance inside and outside the chamber. Even under the high pressure environment of the deep sea at tens of thousands of meters, it effectively prevents seawater from seeping into the chamber and damaging electrical equipment, while ensuring the normal operation of the motor and transmission mechanism, enabling pore water sampling operations across the entire ocean depth range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a vertical cross-sectional view of the multi-way valve head in this invention; Figure 4 This is a cross-sectional view of the multi-way valve head in this invention; Figure 5 This is a schematic diagram of the internal structure of the electronic integration compartment in this invention; Figure 6 This is a schematic diagram of the rear structure of the multi-way valve head in this invention; Figure 7 This is a schematic diagram of the front structure of the turntable in this invention.

[0021] The attached figures are labeled as follows: 1. Mounting plate; 11. Mounting groove; 12. Connecting port; 2. Pin; 21. One-way filter membrane; 3. Water storage pipeline; 31. Extension pipe; 32. Luer connector; 33. Internal threaded straight cylinder connector; 34. Reverse tapered connector; 35. Teflon tube; 4. Threaded reel; 5. Multi-way valve head; 51. Inlet connection hole; 52. Transfer hole; 53. Outlet connection hole; 6. Turntable; 61. Groove; 7. First motor; 81. Piston cylinder; 82. Piston rod; 83. Piston; 84. Ball screw; 85. Screw nut; 86. Limit rod; 87. First synchronous pulley; 88. Synchronous belt; 89. Second synchronous pulley; 80. Second motor; 9. Electronic integrated compartment. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0026] For easier understanding, please refer to Figures 1 to 7This embodiment provides a portable deep-sea sediment pore water sampling device based on ROV, including a long plate-shaped mounting plate 1. The mounting plate 1 is made of non-metallic material to avoid interference from influencing factors caused by metallic materials. Multiple horizontal mounting slots 11 are formed on the mounting plate 1. Pins 2 are horizontally inserted and installed in the mounting slots 11. Pins 2 have inlets and outlets. The inlet is connected to the outside of the mounting plate 1 to allow pore water to enter the pin 2, and the outlet is connected to the inlet of a water storage pipeline 3 to allow pore water to enter the water storage pipeline 3. The inlet of the needle 2 is equipped with a one-way filter membrane 21, which has 0.22-micron pores. The one-way filter membrane 21 allows water to enter but not exit through the pores. Specifically, after the pores are drawn in by the pumping module, they pass through the one-way filter membrane 21 and enter the needle 2. Even if the pumping module stops pumping, the pores inside the needle 2 cannot be discharged from the one-way filter membrane 21 to the outside of the needle 2. Furthermore, the inlet of the needle 2 is located circumferentially, and the outlet is located at one axial end (right end). Correspondingly, two connecting ports 12 are provided on the two sides (front and back) of the mounting plate 1, connecting the inlet of the needle 2 to the outside of the mounting plate 1. This allows both sides of the needle 2 to fully contact deep-sea sediments, significantly increasing the effective filtration surface area of ​​the needle 2. Specifically, the water storage pipeline 3 includes a Luer connector 32 connected to the outlet of the pin 2 via a PE extension pipe 31. The Luer connector 32 is connected to an internally threaded straight cylindrical connector 33, which is then connected to an inverted conical connector 34. The inverted conical connector 34 is then connected to a Teflon tube 35. The Teflon tube 35 has an inner diameter of 1.6 mm, an outer diameter of 3.2 mm, and a length of 4 m to 5 m, and is coiled on the reel 4. Before launching the device, fill all the pore water storage pipelines 3 with deionized water. The specific operation process is as follows: unscrew the connection between the Luer connector 32 and the internal threaded straight tube connector 33. Connect the Luer connector 32 with a 10ml syringe filled with deionized water and slowly push the syringe until water comes out of the inlet of the needle 2. Remove the syringe and temporarily fix the Luer connector 32 vertically upward. Then connect the 10ml syringe filled with deionized water to the internal threaded straight tube connector 33 and slowly push the syringe until a continuous water column appears in the Teflon tube 35 to remove air from the pipeline. Then connect the Teflon tube 35 to the water inlet connection hole 51 of the multi-way valve head 5. Then connect the Luer connector 32 and the internal threaded straight tube connector 33. Inject deionized water into all pipelines in the above manner and check for tightness.

[0027] The multi-way valve head 5 has L-shaped water inlet connection holes 51 and a transfer hole 52. One side opening of both the water inlet connection hole 51 and the transfer hole 52 extends circumferentially from the multi-way valve head 5, while the other side opening extends axially from the multi-way valve head 5. The circumferential opening of the water inlet connection hole 51 connects to the outlet end of the water storage pipeline 3, and the circumferential opening of the transfer hole 52 connects to the pumping module. Furthermore, there are multiple water inlet connection holes 51 spaced apart circumferentially from the multi-way valve head 5, corresponding to multiple mounting grooves 11 on the mounting plate 1, spaced 2cm apart vertically. Multiple pins 2 and water storage pipelines 3 connected to the pins 2 are located within the mounting grooves 11. Even further, all water storage pipelines 3 are wound around a reel 4. A multi-way valve head 5 is rotatably connected to a turntable 6 on one side (rear side) of the axial direction. The position of the turntable 6 corresponds to the axial opening side of the water inlet connection hole 51 and the intermediate transfer hole 52. A long strip-shaped groove 61 is provided on the turntable 6. The axial opening end of the water inlet connection hole 51 and the axial opening end of the intermediate transfer hole 52 are connected through the groove 61.

[0028] The pumping module provides the power for pumping pore water. When the pumping module starts to pump pore water, the transfer hole 52 and the water inlet connection hole 51 are connected by the groove 61, and the water inlet connection hole 51 and the pin 2 are connected by the water storage pipeline 3, forming a complete water supply channel. Therefore, the pore water enters the interior of the pin 2 through the water inlet of the pin 2, then enters the interior of the water storage pipeline 3 through the water outlet of the pin 2, and then enters the pumping module through the water storage pipeline 3 and the water inlet connection hole 51 and the transfer hole 52 of the multi-way valve head 5, realizing the pumping action of pore water. The pore water is stored in the storage pipeline.

[0029] One horizontal end of the groove 61 is located at the rotation center of the turntable 6, and the other horizontal end of the groove 61 extends outward in the circumferential direction of the turntable 6. Specifically, the axial opening end of the transfer hole 52 on the multi-way valve head 5 is also located at the rotation center of the turntable 6. The axial opening end of the water inlet connection hole 51 corresponds to the extended end of the groove 61. That is, the length of the groove 61 is equal to the distance between the axial opening end of the transfer hole 52 and the axial opening end of the water inlet connection hole 51. The multi-way valve head 5 also has an L-shaped outlet connection hole 53. One side of the outlet connection hole 53 extends axially from the multi-way valve head 5, and the other side extends circumferentially from the multi-way valve head 5. The outlet connection hole 53 and the inlet connection hole 51 are spaced apart from each other circumferentially from the multi-way valve head 5. Specifically, the axial opening ends of the inlet connection hole 51 and the axial opening ends of the outlet connection hole 53 are spaced apart circumferentially from the multi-way valve head 5, and the circumferential opening ends of the inlet connection hole 51 and the circumferential opening ends of the outlet connection hole 53 are also spaced apart circumferentially from the multi-way valve head 5. A first rotating component is connected to the rear side of the turntable 6. The first rotating component drives the turntable 6 to rotate, so that the groove 61 on the turntable 6 connects the transfer hole 52 to any one of the inlet connection holes 51 or the outlet connection hole 53. That is, the transfer hole 52 can only be connected to one connection hole on the multi-way valve head 5 at a time. Furthermore, the first rotating assembly includes a first motor 7, the motor shaft of which is fixedly connected to the center of the turntable 6 via a connecting shaft. Even further, a photoelectric sensor is mounted on the connecting shaft to provide feedback on the rotation angle of the multi-way valve head 5.

[0030] The extraction module includes a piston cylinder 81, the left end of which is connected to the circumferential opening of the transfer hole 52. A piston 83 is movably connected inside the piston cylinder 81, and a piston rod 82 is connected to the piston 83. Driving the piston rod 82 causes the piston 83 to move inside the piston cylinder 81, thus pumping water into or out of the piston cylinder 81. One end of the piston rod 82, which passes through the piston cylinder 81, is connected to a drive mechanism, which drives the piston 83 to move inside the piston cylinder 81. The drive mechanism includes a ball screw 84, with a screw nut 85 connected to it. The screw nut 85 is connected to the end of the piston rod 82 via a connecting rod. A second rotating assembly is connected to the horizontal right side of the ball screw 84, which drives the ball screw 84 to rotate. Furthermore, the lower end of the lead screw nut 85 is movably connected to the limiting rod 86, which limits the horizontal movement of the lead screw nut 85 to ensure smooth movement. A photoelectric sensor is installed on the horizontal right side of the ball screw 84. When the ball screw 84 rotates, it drives the photoelectric sensor to rotate as well, thereby providing feedback on the displacement step of the lead screw nut 85. The second rotating assembly includes a first synchronous pulley 87, which is connected to the right end of the ball screw 84. The first synchronous pulley 87 is connected to a second synchronous pulley 89 via a synchronous belt 88, and the second synchronous pulley 89 is connected to the motor shaft of the second motor 80.

[0031] The device also includes an electronic integrated compartment 9, which houses spaced battery packs and circuit boards. To adapt to the deep-sea environment, the electronic integrated compartment 9 employs an internal and external pressure compensation method. The compartment is filled with silicone oil to ensure the safe operation of electrical equipment, and a flexible compensator is connected to the outside of the compartment for compensation, ensuring pressure balance inside and outside the compartment. The first motor 7 and the second motor 80 are both located inside the electronic integrated compartment 9, integrating all power supply equipment into one compartment, achieving equipment integration and lightweight design. The motor shafts of the first motor 7 and the second motor 80 both penetrate the side wall of the electronic integrated compartment 9. The reel 4 is fixedly installed on the upper exterior of the electronic integrated compartment 9. The multi-way valve head 5 is fixedly installed on the front exterior of the electronic integrated compartment 9 via a bracket. The ball screw 84 and the limit rod 86 are both fixedly installed on the external side wall of the electronic integrated compartment 9 via a bracket. The first synchronous pulley 87, the synchronous belt 88, and the second synchronous pulley 89 are all located on the exterior of the electronic integrated compartment 9.

[0032] The working process of this invention is as follows: In the initial state, the bottom of piston 83 abuts against the left side of the inside of piston cylinder 81, and the lead screw nut 85 is located to the left of ball screw 84. Deionized water is injected into all water storage pipelines 3 and a leak test is performed. The device is then fixedly installed on the ROV. The device is electrically connected to the ROV via a communication cable. Submersion is only permitted after the test signal is normal. After the device reaches the designated deep-sea depth via the ROV, the ROV's manipulator uses the handle on the upper part of the mounting plate 1 to insert the mounting plate 1 into the deep-sea sediment for fixation. A command is issued from the host computer to begin pumping pore water. The first motor 7 is activated to drive the turntable 6 to rotate, connecting the groove 61 to a water inlet connection hole 51 and a transfer hole 52. The first motor 7 is stopped, and then the second motor 80 is activated to rotate forward. The motor shaft of the second motor 80 drives the second synchronous pulley 89 to rotate. Power is transmitted through the synchronous belt 88 connected to the outside of the first synchronous pulley 87 and the second synchronous pulley 89, driving the first synchronous pulley 87 to rotate, which in turn drives the ball screw connected to the first synchronous pulley 87. The lever 84 rotates together, and at the same time, the screw nut 85 installed on the ball screw 84 begins to move horizontally from left to right. Through the connecting rod, the piston 83 and piston rod 82 are pulled to move from left to right in the piston cylinder 81. At this time, the pore water outside the mounting plate 1 enters the needle 2 through the one-way filter membrane 21, and then enters the water storage pipeline 3. It then passes through the water storage pipeline 3, the water inlet connection hole 51 of the multi-way valve head 5, the groove 61 of the turntable 6, and the transfer hole 52 of the multi-way valve head 5 in sequence, and gradually enters the left cavity of the piston cylinder 81, completing the pore water suction action. At this time, the Teflon tube 35 contains the pore water sample from the deep-sea sediment, and the piston cylinder 81 contains the deionized water originally stored in the water storage pipeline 3. The host computer issues a command to start discharging pore water, activating the first motor 7 to drive the turntable 6 to rotate, connecting the groove 61 to the water outlet connection hole 53 and the transfer hole 52. The first motor 7 is then stopped, and the second motor 80 is activated in reverse. The motor shaft of the second motor 80 drives the second synchronous pulley 89 to rotate. Power is transmitted through the synchronous belt 88 connected to the outside of the first synchronous pulley 87 and the second synchronous pulley 89, driving the first synchronous pulley 87 to rotate, which in turn drives the ball screw 84 connected to the first synchronous pulley 87. Simultaneously, as the ROV rotates, the screw nut 85 mounted on the ball screw 84 begins to move horizontally from right to left, pulling the piston 83 and piston rod 82 within the piston cylinder 81 from right to left via the connecting rod. At this time, the deionized water within the piston cylinder 81 is squeezed and sequentially passes through the transfer hole 52 of the multi-way valve head 5, the groove 61 of the turntable 6, and the outlet connection hole 53 of the multi-way valve head 5, before being discharged to the outside of the device, completing the pore water discharge action. This completes the pore water collection action from one deep-sea sediment (or one water storage pipeline 3). The ROV movement and the device's suction and discharge actions are repeated to achieve pore water collection from multiple deep-sea sediments (or multiple water storage pipelines 3), with the pore water samples stored in different water storage pipelines 3.

[0033] Although the present invention has been described using the above preferred embodiments, it is not intended to limit the scope of protection of the present invention. Any changes and modifications made by those skilled in the art to the above embodiments without departing from the spirit and scope of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A portable deep-sea sediment pore water sampling device based on ROV, characterized in that, The device includes a mounting plate (1) with a mounting groove (11) and a multi-way valve head (5) with an inlet connection hole (51) and a transfer hole (52). A pin (2) is provided in the mounting groove (11). The pin (2) has an inlet that communicates with the outside of the mounting plate (1) and an outlet that connects to one end of the water storage pipeline (3). A one-way filter membrane (21) is provided at the inlet. The openings of the inlet connection hole (51) and the transfer hole (52) are both on one side of the multi-way valve head (5). The openings on the other side extend axially from the multi-way valve head (5). The circumferential opening end of the water inlet connection hole (51) is connected to the other end of the water storage pipeline (3). The circumferential opening end of the transfer hole (52) is connected to a pumping module for providing pumping power. The multi-way valve head (5) is connected to a turntable (6) on one axial side. A groove (61) is provided on the turntable (6). The axial opening end of the water inlet connection hole (51) and the axial opening end of the transfer hole (52) are connected through the groove (61). The turntable (6) is connected to a first rotating component. One end of the groove (61) is located at the rotation center of the turntable (6), and the other end of the groove (61) extends along the circumference of the turntable (6). The multi-way valve head (5) is also provided with a water outlet connection hole (53). The water outlet connection hole (53) and the water inlet connection hole (51) are spaced apart from each other in the circumference of the multi-way valve head (5). One side of the water outlet connection hole (53) opens and extends in the circumference of the multi-way valve head (5), and the other side opens and extends in the axial direction of the multi-way valve head (5). The turntable (6) is driven to rotate by the first rotating component, so that the groove (61) on the turntable (6) connects the transfer hole (52) with any connection hole.

2. The portable deep-sea sediment pore water sampling device based on ROV according to claim 1, characterized in that, The water inlet connection hole (51) is multiple and is spaced apart on the circumference of the multi-way valve head (5). There are multiple mounting grooves (11) on the mounting plate (1), pins (2) in the mounting grooves (11), and water storage pipelines (3) connected to the pins (2).

3. The portable deep-sea sediment pore water sampling device based on ROV according to claim 2, characterized in that, The plurality of mounting slots (11) are respectively spaced apart from each other in the vertical direction of the mounting plate (1).

4. The portable deep-sea sediment pore water sampling device based on ROV according to claim 2, characterized in that, The water inlet is located on the circumferential direction of the pin (2), and the water outlet is located on one axial end of the pin (2). A connecting port (12) for connecting the water inlet and the outside of the mounting plate (1) is provided on the side of the mounting plate (1).

5. The portable deep-sea sediment pore water sampling device based on ROV according to claim 1, characterized in that, The pumping module includes a piston cylinder (81) connected to the circumferential opening end of the transfer hole (52). A piston (83) is movably connected inside the piston cylinder (81). The piston (83) is connected to a piston rod (82). By driving the piston (83) to move inside the piston cylinder (81), water can be pumped into the piston cylinder (81) or drained from the piston cylinder (81). The piston rod (82) is connected to a drive mechanism at one end that passes through the piston cylinder (81) for driving the piston (83) to move inside the piston cylinder (81).

6. The portable deep-sea sediment pore water sampling device based on ROV according to claim 5, characterized in that, The drive mechanism includes a ball screw (84) and a screw nut (85) connected to the ball screw (84). The screw nut (85) is connected to the piston rod (82). The ball screw (84) is connected to a second rotating component for driving the ball screw (84) to rotate.

7. The portable deep-sea sediment pore water sampling device based on ROV according to claim 6, characterized in that, The second rotating assembly includes a first synchronous pulley (87) connected to a ball screw (84), the first synchronous pulley (87) being connected to a second synchronous pulley (89) via a synchronous belt (88), and the second synchronous pulley (89) being connected to a second motor (80).

8. The portable deep-sea sediment pore water sampling device based on ROV according to claim 7, characterized in that, The first rotating assembly includes a first motor (7) connected to the turntable (6).

9. The portable deep-sea sediment pore water sampling device based on ROV according to claim 8, characterized in that, It also includes an electronic integrated compartment (9), with the first motor (7) and the second motor (80) both located inside the electronic integrated compartment (9), and the multi-way valve head (5), ball screw (84), first synchronous pulley (87), synchronous belt (88), and second synchronous pulley (89) all located outside the electronic integrated compartment (9).

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