A multi-point sampling device for sediments on the surface of seabed rocks

Abstract

The present invention discloses a multi-point sampling device for sediments on the surface of seabed rocks, comprising a mud suction hood, a conduit, an upper end suction filtration docking chamber connecting rod, an upper end suction filtration docking chamber, an upper end oil cylinder, an upper end suction filtration docking chamber sealing rubber, a lower end oil cylinder, a lower end suction filtration docking chamber, a lower end suction filtration docking chamber connecting rod, a centrifugal pump, a servo motor, an upper turntable, a fixed bracket, a double-headed stud, a sampling bottle, a suction bottle, a lower turntable, an ROV connecting base, a lower end suction filtration docking chamber sealing rubber, a permeable mesh filter cloth, a sediment suction filtration sealing ring, a support plate, and a drain pipe. The device of the present invention adopts a centrifugal pump suction method, and is usually equipped with an ROV to achieve precise sampling for micro-area field surveys. A servo motor is configured to drive the sampling turntable to achieve precise rotation sampling of sampling bottles. The present invention can achieve multiple sampling of sediments at different points under special seabed environments in one operation, and has the advantages of reliable structure, low cost, strong environmental adaptability, easy replacement of parts, high precision, and high efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of exploration geochemistry, and relates to a sampling device for seabed rock surface sediments, mainly to a multi-point rock surface sediment sampling tool based on a remotely operated unmanned vehicle (ROV). Background Art

[0002] Seafloor hydrothermal systems are important sources and sinks of various elements in the ocean. The oceanic circulation of hydrothermal elements holds implications for understanding the geochemical cycles of some key elements for life in the ocean. The chemical composition distribution of seafloor surface sediments not only provides effective geochemical signatures, but also closely correlates with mineral deposits. Therefore, studying sediment geochemical anomalies is crucial for tracing seafloor hydrothermal activity and geochemical prospecting. However, certain areas surrounding hydrothermal vents are often composed of fractured or altered basalt, making sampling of surface seafloor sediments difficult. Conventional sampling methods, such as video grabs or multi-tube sampling, not only disrupt the benthic habitat of seafloor organisms and violate International Seabed Authority environmental regulations, but also fail to collect fresh surface sediments. While submersible-based surface sediment sampling devices are currently available, most use columnar sediment sampling, which can disrupt deep sediment structure and makes it difficult to sample surface sediments in areas with complex seafloor topography or rocky substrates. For ROV-based grid surveys of hydrothermal element distribution in hydrothermal micro-areas, collecting sediments from rock surfaces or complex terrain surfaces is particularly important for studying seafloor hydrothermal activity and its dynamic sedimentary processes. Therefore, the development of a precise sampling device for seafloor rock surface sediments that is highly adaptable, efficient, and reliable can fill the gaps in existing seafloor rock surface sediment sampling technology, further exploring the anomaly of elemental geochemical distribution in seafloor hydrothermal area sediments, and providing support for accurately assessing the potential impact of hydrothermal activity on ocean element circulation. Summary of the Invention

[0003] In order to solve the above-mentioned sediment sampling technical problems, the purpose of the present invention is to provide a multi-point sampling device for sediments on the surface of seabed rocks, so as to realize grid-based precise sampling and analysis of elemental geochemical anomalies in sediments in seabed hydrothermal areas. The operation steps are relatively simple, the requirements for operators are low, and the sampling process has little disturbance to the environment, and the sampling efficiency is high.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A multi-point sampling device for sediments on the surface of seabed rocks, comprising a mud suction hood, a guide tube, an upper suction filtration docking chamber connecting rod, an upper suction filtration docking chamber, an upper oil cylinder, a sealing rubber for the upper suction filtration docking chamber, a lower oil cylinder, a lower suction filtration docking chamber, a connecting rod for the lower suction filtration docking chamber, a centrifugal pump, a servo motor, an upper turntable, a fixing bracket, a stud, a sampling bottle, a suction filtration bottle, a lower turntable, an ROV connecting base, a sealing rubber for the lower suction filtration docking chamber, a water-permeable mesh filter cloth, a sediment suction filtration sealing ring, a support plate, and a drain pipe;

[0006] One end of the conduit is connected to the mud suction cover, and the other end is connected to the upper end suction and filtration docking cavity; the upper end of the sampling bottle is installed in the groove position of the upper turntable, connected to the upper end suction and filtration docking cavity, and the lower end is connected to the upper end of the suction and filtration bottle; the lower end of the suction and filtration bottle is installed in the groove position of the lower turntable, connected to the lower end suction and filtration docking cavity; the upper end suction and filtration docking cavity is provided with an upper end suction and filtration docking cavity sealing rubber, and is fixed to the upper turntable through the upper end suction and filtration docking cavity connecting rod and the fixing bracket; the upper end oil cylinder is respectively connected to the upper end suction and filtration docking cavity connecting rod and the upper turntable; the lower end suction and filtration A lower end suction filtration docking cavity sealing rubber is provided in the filter docking cavity and is fixed to the lower turntable through the lower end suction filtration docking cavity connecting rod and the fixed bracket; the lower end oil cylinder is respectively connected to the lower end suction filtration docking cavity connecting rod and the lower turntable; the two ends of the stud are respectively connected to the upper turntable and the lower turntable; the servo motor is fixed to the upper end of the fixed bracket and is connected to the upper turntable at the same time; one end of the centrifugal pump is connected to the lower end suction filtration docking cavity, and the other end is equipped with a drain pipe; the fixed bracket is connected to the ROV connection base, and the ROV connection base is fixed to the ROV frame.

[0007] The mud suction cover is made of a soft rubber material, and its edge is in a saw-shaped skirt shape.

[0008] The catheter consists of a rigid connecting tube and a flexible, retractable connecting tube, which are connected by a threaded connection. The rigid connecting tube is short, making it easier for the ROV manipulator to control and grasp the rigid connecting tube during sampling. The length of the flexible, retractable connecting tube can be adjusted based on the distance between the ROV's hovering position and the sampling location.

[0009] A support plate and a water-permeable mesh filter cloth are placed between the lower end of the sampling bottle and the upper end of the suction bottle. The order from top to bottom is the lower end cover of the sampling bottle, the water-permeable mesh filter cloth, the support plate, the water-permeable mesh filter cloth, and the upper end cover of the suction bottle.

[0010] The support plate is provided with irregular holes of different sizes and a groove on the outer edge. Sediment filtration sealing rings are provided between the two sides of the support plate and the lower end of the sampling bottle and the upper end of the filtration bottle. The three are fixed and sealed by screws.

[0011] The upper suction filtration docking chamber is controlled by the upper end oil cylinder to fine-tune up and down to loosen or press the upper interface, and in conjunction with the upper end suction filtration docking chamber sealing rubber, the connection and sealing of the upper end of the sampling bottle is realized. The lower end suction filtration docking chamber is controlled by the lower end oil cylinder to fine-tune up and down to loosen or press the lower interface, and in conjunction with the lower end suction filtration docking chamber sealing rubber, the connection and sealing of the lower end of the sampling bottle is realized.

[0012] The upper turntable and the lower turntable are respectively provided with holes corresponding to the positions and numbers of the sampling bottles and the filtration bottles, and the hole diameters are smaller than the upper ports of the sampling bottles and the lower ports of the filtration bottles.

[0013] When the servo motor is working, the centrifugal pump stops working, the upper end oil cylinder controls the upper end suction and filtration docking chamber to move upward in fine adjustment to loosen the upper interface, and at the same time, the lower end oil cylinder controls the lower end suction and filtration docking chamber to move downward in fine adjustment to loosen the lower interface; the servo motor is equipped with a rotary encoder, which can control the upper turntable and the lower turntable to rotate to a preset position, and at the same time realize the replacement of the sampling bottle and the suction and filtration bottle.

[0014] The centrifugal pump provides power for sampling operations, drawing the muddy-water mixture into a sampling bottle. The sample is then filtered through a permeable mesh filter cloth to collect surface sediment. The filtered seawater is then returned to the seawater environment through the filter bottle and the centrifugal pump via a drainpipe. The centrifugal pump's motor drive is connected to the ROV's power module.

[0015] The advantages and positive effects of the present invention are:

[0016] 1. Strong environmental adaptability: The front end of the multi-point sampling device for seabed rock surface sediments designed by the present invention is a soft rubber mud suction cover. It is suitable for operations in various complex seabed terrain environments, especially in areas with steep seabed terrain or a large number of massive rocks.

[0017] 2. Reliable structure: The multi-point sampling device for seabed rock surface sediments designed by the present invention uses a centrifugal pump to provide power to suck the mud-water mixture into the sampling bottle, and collects the surface sediments by filtering through a permeable mesh filter cloth.

[0018] 3. Low cost: The parts of the multi-point sampling device for seabed rock surface sediments designed by the present invention are easy to process and have low processing costs; bolts, nuts and other connection methods, as well as sealing rings, can be used, and the assembly cost is low.

[0019] 4. Low disturbance: The cross-sectional area of ​​the mud suction cover of the multi-point sampling device for seabed rock surface sediments designed by the present invention is small, which only affects the area covered by the mud suction cover, and the power of the centrifugal pump used in the device is set to only be able to collect surface sediments.

[0020] 5. Easy replacement of parts: The parts of the multi-point sampling device for seabed rock surface sediments designed by the present invention are easy to replace, and different structures are independent of each other, so damaged parts can be replaced independently.

[0021] 6. High sampling efficiency: The multi-point sampling device for seabed rock surface sediments designed by the present invention adopts a servo motor with a rotary encoder to drive the replacement of the sampling bottle, thereby realizing that the sampler can take samples multiple times and at multiple points in one trip to the sea, greatly saving underwater operation ship time and improving the efficiency of surface sediment sampling operations in complex seabed terrain environments.

[0022] 7. Precise sampling: The sampling device designed in this invention is intended to be carried by an ROV to collect sediments on the surface of seabed rocks. The ROV positioning device and manipulator can be used for precise sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a multi-point sampling device for sediments on the seabed rock surface.

[0024] Figure 2 Isometric diagram of a multi-point sampling device for sediments on the seafloor rock surface.

[0025] Figure 3 This is a front view of the multi-point sampling device for sediments on the seabed rock surface.

[0026] Figure 4 This is an overhead view of the multi-point sampling device for sediments on the seabed rock surface.

[0027] Figure 5 This is a cross-sectional view of the multi-point sampling device for sediments on the seabed rock surface.

[0028] Figure 6 This is the left view of the multi-point sampling device for sediments on the seabed rock surface.

[0029] Figure 7 Schematic diagram of the support plate of the multi-point sampling device for sediments on the seabed rock surface.

[0030] Among them: 1 is the mud suction hood, 2 is the guide tube (2.1 is the hard connecting tube, 2.2 is the soft retractable connecting tube), 3 is the upper end suction filtration docking chamber connecting rod, 4 is the upper end suction filtration docking chamber, 5 is the upper end oil cylinder, 6 is the upper end suction filtration docking chamber sealing rubber, 7 is the lower end oil cylinder, 8 is the lower end suction filtration docking chamber, 9 is the lower end suction filtration docking chamber connecting rod, 10 is the centrifugal pump, 11 is the servo motor, 12 is the upper turntable, 13 is the fixed bracket, 14 is the double-headed stud, 15 is the sampling bottle, 16 is the suction bottle, 17 is the lower turntable, 18 is the ROV connection base, 19 is the lower end suction filtration docking chamber sealing rubber, 20 is the permeable mesh filter cloth, 21 is the sediment filtration sealing ring, 22 is the support plate, and 23 is the drain pipe. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and examples.

[0032] like Figures 1 to 7 As shown, the present invention includes a mud suction cover 1, a guide tube 2, an upper end suction filtration docking chamber connecting rod 3, an upper end suction filtration docking chamber 4, an upper end oil cylinder 5, an upper end suction filtration docking chamber sealing rubber 6, a lower end oil cylinder 7, a lower end suction filtration docking chamber 8, a lower end suction filtration docking chamber connecting rod 9, a centrifugal pump 10, a servo motor 11, an upper turntable 12, a fixing bracket 13, a stud 14, a sampling bottle 15, a suction bottle 16, a lower turntable 17, an ROV connecting base 18, and a lower end suction Filter docking chamber sealing rubber 19, permeable mesh filter cloth 20, sediment suction filtration sealing ring 21, support plate 22, drain pipe 23; wherein, one end of the conduit 2 is connected to the mud suction cover 1, and the other end is connected to the upper end suction filtration docking chamber 4; the upper end of the sampling bottle 15 is installed in the groove position of the upper turntable 12, connected to the upper end suction filtration docking chamber 4, and the lower end is connected to the upper end of the suction filtration bottle 16; the lower end of the suction filtration bottle 16 is installed in the groove position of the lower turntable 17, and is connected to the lower end suction filtration docking chamber 4. The servo motor 11 is fixed to the upper end of the fixing bracket 13 and is connected to the upper turntable 12 at the same time; one end of the centrifugal pump 10 is connected to the lower end suction filtration docking chamber 8, and the other end is provided with a drain pipe 23; the fixing bracket 13 is connected to the ROV connecting base 18, and the ROV connecting base 18 is fixed to the ROV frame.

[0033] In this embodiment, the mud suction cover is made of a soft rubber material, and the edge is in a saw-shaped skirt shape.

[0034] In this embodiment, the catheter 2 consists of a rigid connecting tube 2.1 and a flexible, retractable connecting tube 2.2, which are connected by a threaded connection. The rigid connecting tube 2.1 is relatively short, facilitating the ROV manipulator's control and gripping of the rigid connecting tube 2.1 during sampling. The length of the flexible, retractable connecting tube 2.2 can be adjusted based on the distance between the ROV's hovering position and the sampling location.

[0035] In this embodiment, a support plate 22 and a water-permeable mesh filter cloth 20 are placed between the lower end of the sampling bottle 15 and the upper end of the suction bottle 16. The order from top to bottom is the lower end cover of the sampling bottle 15, the water-permeable mesh filter cloth 20, the support plate 22, the water-permeable mesh filter cloth 20, and the upper end cover of the suction bottle 16.

[0036] In this embodiment, the support plate 22 is provided with irregular holes of different sizes and a groove on the outer edge. Sediment filtration sealing rings 21 are provided between the two sides of the support plate 22 and the lower end cover of the sampling bottle 15 and the upper end cover of the filtration bottle 16, and the three are fixed and sealed by screws.

[0037] In this embodiment, the upper end suction docking chamber 4 is controlled by the upper end oil cylinder 5 to fine-tune it up and down to loosen or press the upper interface, and combined with the upper end suction docking chamber sealing rubber 6 to realize the connection and sealing of the upper end of the sampling bottle 15; the lower end suction docking chamber 8 is controlled by the lower end oil cylinder 7 to fine-tune it up and down to loosen or press the lower interface, and combined with the lower end suction docking chamber sealing rubber 19 to realize the connection and sealing of the lower end of the sampling bottle 15.

[0038] In this embodiment, the upper turntable 12 and the lower turntable 17 are respectively provided with holes corresponding to the positions and numbers of the sampling bottles 15 and the filtration bottles 16, and the hole size is smaller than the upper port of the sampling bottle 15 and the lower port of the filtration bottle 16.

[0039] In this embodiment, when the servo motor 11 is working, the centrifugal pump 10 stops working, and the upper end oil cylinder 5 controls the upper end suction docking chamber 4 to fine-tune and move upward to loosen the upper interface. At the same time, the lower end oil cylinder 7 controls the lower end suction docking chamber 8 to fine-tune and move downward to loosen the lower interface; the servo motor 11 is equipped with a rotary encoder, which can control the upper turntable 12 and the lower turntable 17 to rotate to the preset position, and at the same time realize the replacement of the sampling bottle 15 and the suction bottle 16.

[0040] In this embodiment, centrifugal pump 10 provides power for sampling operations, pumping the muddy-water mixture into sampling bottle 15. Surface sediment is filtered through permeable mesh filter cloth 20, and the filtered seawater is returned to the seawater environment via filter bottle 16 and centrifugal pump 10 through drain pipe 23. Furthermore, the motor drive unit of centrifugal pump 10 is connected to the ROV's power module.

[0041] The working principle of the present invention is:

[0042] Before sampling, the sampling bottle 15 and the filter bottle 16 must be filled with pure water. During seafloor sampling, a manipulator grips the rigid connecting tube 2.1 and moves the suction hood 1 to the designated sampling area. Once the hood 1 is accurately positioned and covering the intended sample, the centrifugal pump 10 is switched on, and a mixture of rock surface sediment and seawater is simultaneously drawn into the sampling bottle 15. The surface sediment is then filtered through the permeable mesh filter cloth 20, where it is collected. The filtered seawater then flows through the filter bottle 16 and the centrifugal pump 10, and is returned to the seawater environment via the drain pipe 23.

[0043] After the sampling operation is completed, the centrifugal pump 10 stops working, and the upper end cylinder 5 controls the upper end suction and filtration docking chamber 4 to fine-tune upward to loosen the upper interface, while the lower end cylinder 7 controls the lower end suction and filtration docking chamber 8 to fine-tune downward to loosen the lower interface; the servo motor 11 is controlled by the rotary encoder and uses the spline shaft and bearing to rotate the upper turntable 12 and the lower turntable 17 to specific positions at the same time; at this time, the upper end cylinder 5 controls the upper end suction and filtration docking chamber 4 to fine-tune downward to press the upper interface, while the lower end cylinder 7 controls the lower end suction and filtration docking chamber 8 to fine-tune upward to press the lower interface, thereby achieving the sealing of the sampling bottle 15 and the suction bottle 16.

[0044] Before the second seabed sampling operation, the upper oil cylinder 5 controls the upper end suction docking chamber 4 to fine-tune upward to loosen the upper interface, and at the same time, the lower end oil cylinder 7 controls the lower end suction docking chamber 8 to fine-tune downward to loosen the lower interface; the servo motor 11 controls the upper turntable 12 and the lower turntable 17 to rotate to the next sampling bottle 15 and suction bottle 16 through the rotary encoder; the upper end oil cylinder 5 controls the upper end suction docking chamber 4 to fine-tune downward to press the upper interface, and at the same time, the lower end oil cylinder 7 controls the lower end suction docking chamber 8 to fine-tune upward to press the lower interface; repeat the seabed sampling operation and the sampling operation completion process until the required sediment sample is collected, and the manipulator clamps the hard connecting tube 2.1 and puts it back into the sampling basket.

[0045] One application example of the present invention is: when conducting ROV field survey operations in a seabed hydrothermal area, it is intended to collect surface sediment samples of large rocks or granular rock fragments near the seabed hydrothermal vents. First, the seabed rock surface sediment multi-point sampling device is fixedly mounted on the ROV through the ROV connecting base 18, wherein the centrifugal pump 10, the upper turntable 12, the lower turntable 17, the sampling bottle 15, the suction bottle 16, are all placed on the ROV frame body through the fixed bracket 13, and the mud suction cover 1 and the guide tube 2 are placed in the ROV sampling basket. When the ROV is completely immersed in seawater, the mud suction cover 1, the hard connecting pipe 2.1, the soft and retractable connecting pipe 2.2, the upper end suction and filtration docking chamber 4, the lower end suction and filtration docking chamber 8, the centrifugal pump 10 and the drain pipe 23 will all be filled with seawater, and the sampling bottle 15 and the suction and filtration bottle 16 have been filled with pure water in advance. During seabed sampling, a manipulator grips the rigid connecting tube 2.2, moves the suction hood 1, and precisely positions it over large rocks or granular rock fragments. The centrifugal pump 10 is then turned on, simultaneously sucking a mixture of sediment and seawater from the rock surface into the sampling bottle 15. The surface sediment is filtered and collected by the permeable mesh filter cloth 20. The filtered seawater then flows through the filter bottle 16 and the centrifugal pump 10 and is returned to the seawater environment via the drain pipe 23. After sampling is complete, the centrifugal pump 10 is turned off, and the upper cylinder 5 controls the upper filter docking chamber 4 to fine-tune upward, loosening the upper connection. Simultaneously, the lower cylinder 7 controls the lower filter docking chamber 8 to fine-tune downward, loosening the lower connection. The servo motor 11 controls the upper and lower turntables 12 and 17 to rotate simultaneously to designated positions. The upper cylinder 5 controls the upper filter docking chamber 4 to fine-tune downward, tightening the upper connection. Simultaneously, the lower cylinder 7 controls the lower filter docking chamber 8 to fine-tune upward, tightening the lower connection, thereby sealing the sampling bottle 15 and the filter bottle 16. When the seabed sampling operation is carried out for the second time, the upper oil cylinder 5 and the lower oil cylinder 7 control the opening of the upper suction docking chamber 4 and the lower suction docking chamber 8; the servo motor 11 controls the upper turntable 12 and the lower turntable 17 to rotate to the next sampling bottle 15 and suction bottle 16; the upper oil cylinder 5 and the lower oil cylinder 7 control the closing of the upper suction docking chamber 4 and the lower suction docking chamber 8; the seabed sampling operation and the sampling operation completion process are repeated until the required sediment samples are collected, and the manipulator clamps the hard connecting tube 2.1 and puts it back into the sampling basket.

[0046] When a multi-point sampling device for seafloor rock surface sediments is used with an ROV to collect surface sediment samples in complex terrain near hydrothermal vents, sampling bottle 15 and filter bottle 16 are pre-filled with pure water. During seafloor sampling, a manipulator grips the rigid connecting pipe 2.2, moves the suction hood 1 over the intended sample, and then turns on the control switch of centrifugal pump 10. A mixture of rock surface sediment and seawater is simultaneously drawn into sampling bottle 15, where it is filtered through permeable mesh filter cloth 20 to collect the surface sediment. The filtered seawater then flows through filter bottle 16 and centrifugal pump 10 and is returned to the seawater environment through drain pipe 23. After the sampling operation is completed, the centrifugal pump 10 is turned off, and the upper end oil cylinder 5 controls the upper end suction and filtration docking chamber 4 to fine-tune upward to loosen the upper interface, while the lower end oil cylinder 7 controls the lower end suction and filtration docking chamber 8 to fine-tune downward to loosen the lower interface; the servo motor 11 controls the upper turntable 12 and the lower turntable 17 to rotate to the specified position at the same time; the upper end oil cylinder 5 controls the upper end suction and filtration docking chamber 4 to fine-tune downward to press the upper interface, while the lower end oil cylinder 7 controls the lower end suction and filtration docking chamber 8 to fine-tune upward to press the lower interface, thereby achieving the sealing of the sampling bottle 15 and the suction bottle 16. When the seabed sampling operation is carried out for the second time, the upper oil cylinder 5 and the lower oil cylinder 7 control the opening of the upper suction docking chamber 4 and the lower suction docking chamber 8; the servo motor 11 controls the upper turntable 12 and the lower turntable 17 to rotate to the next sampling bottle 15 and suction bottle 16; the upper oil cylinder 5 and the lower oil cylinder 7 control the closing of the upper suction docking chamber 4 and the lower suction docking chamber 8; the seabed sampling operation and the sampling operation completion process are repeated until the required sediment samples are collected, and the manipulator clamps the hard connecting tube 2.1 and puts it back into the sampling basket.

[0047] The embodiments described above relate only to preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any changes and improvements made to the technical solutions of the present invention by persons skilled in the art without departing from the design concept of the present invention are intended to fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims and any equivalents thereof.

Claims

1. A multi-point sampling device for seabed rock surface sediments, characterized by: The invention comprises a mud suction cover (1), a conduit (2), an upper end suction filtration docking chamber connecting rod (3), an upper end suction filtration docking chamber (4), an upper end oil cylinder (5), an upper end suction filtration docking chamber sealing rubber (6), a lower end oil cylinder (7), a lower end suction filtration docking chamber (8), a lower end suction filtration docking chamber connecting rod (9), a centrifugal pump (10), a servo motor (11), an upper turntable (12), a fixing bracket (13), a double-headed stud (14), a sampling bottle (15), a suction filtration bottle (16), a lower turntable (17), an ROV connecting base (18), a lower end suction filtration docking chamber Cavity sealing rubber (19), permeable mesh filter cloth (20), sediment filtration sealing ring (21), support plate (22), drain pipe (23); wherein, one end of the conduit (2) is connected to the mud suction cover (1), and the other end is connected to the upper end filtration docking cavity (4); the upper end of the sampling bottle (15) is installed in the groove position of the upper turntable (12), connected to the upper end filtration docking cavity (4), and the lower end is connected to the upper end of the filtration bottle (16); the lower end of the filtration bottle (16) is installed in the groove position of the lower turntable (17), connected to the lower end filtration docking cavity (8 ) connection; the upper end suction filtration docking cavity (4) is provided with an upper end suction filtration docking cavity sealing rubber (6), and is fixed to the upper turntable (12) through the upper end suction filtration docking cavity connecting rod (3) and the fixing bracket (13); the upper end oil cylinder (5) is respectively connected to the upper end suction filtration docking cavity connecting rod (3) and the upper turntable (12); the lower end suction filtration docking cavity (8) is provided with a lower end suction filtration docking cavity sealing rubber (19), and is fixed to the lower turntable (17) through the lower end suction filtration docking cavity connecting rod (9) and the fixing bracket (13); the lower end oil cylinder (7) The connecting rod (9) of the lower end suction and filtration docking chamber and the lower turntable (17) are respectively connected; the two ends of the stud (14) are respectively connected to the upper turntable (12) and the lower turntable (17); the servo motor (11) is fixed to the upper end of the fixed bracket (13) and is connected to the upper turntable (12); one end of the centrifugal pump (10) is connected to the lower end suction and filtration docking chamber (8), and the other end is equipped with a drain pipe (23); the fixed bracket (13) is connected to the ROV connection base (18), and the ROV connection base (18) is fixed to the ROV frame; The mud suction cover (1) is made of a soft rubber material, and its edge is in the shape of a saw-shaped skirt; A support plate (22) and a water-permeable mesh filter cloth (20) are placed between the lower end of the sampling bottle (15) and the upper end of the suction filtration bottle (16), and the order from top to bottom is the lower end cover of the sampling bottle (15), the water-permeable mesh filter cloth (20), the support plate (22), the water-permeable mesh filter cloth (20), and the upper end cover of the suction filtration bottle (16).

2. The multi-point sampling device for seabed rock surface sediments according to claim 1, characterized in that: The catheter (2) is composed of a hard connecting tube (2.1) and a soft retractable connecting tube (2.2), and the hard connecting tube (2.1) and the soft retractable connecting tube (2.2) are connected by screwing; the hard connecting tube (2.1) is short, which facilitates the ROV manipulator to control and clamp the hard connecting tube (2.1) for sampling; the length of the soft retractable connecting tube (2.2) can be adjusted flexibly according to the distance between the ROV hovering position and the sampling position.

3. The multi-point sampling device for seabed rock surface sediments according to claim 1, characterized in that: The support plate (22) is provided with irregular holes of different sizes and a groove on the outer edge. Sediment filtration sealing rings (21) are provided between the two sides of the support plate (22) and the lower end cover of the sampling bottle (15) and the upper end cover of the filtration bottle (16), and the three are fixed and sealed by screws.

4. The multi-point sampling device for seabed rock surface sediments according to claim 1, characterized in that: The upper end suction filtration docking chamber (4) is controlled by the upper end oil cylinder (5) to move in a fine adjustment up and down to loosen or press the upper interface, and is combined with the upper end suction filtration docking chamber sealing rubber (6) to achieve the connection and sealing of the upper end of the sampling bottle (15); the lower end suction filtration docking chamber (8) is controlled by the lower end oil cylinder (7) to move in a fine adjustment up and down to loosen or press the lower interface, and is combined with the lower end suction filtration docking chamber sealing rubber (19) to achieve the connection and sealing of the lower end of the sampling bottle (15).

5. The multi-point sampling device for seabed rock surface sediments according to claim 1, characterized in that: The upper turntable (12) and the lower turntable (17) are respectively provided with holes corresponding to the positions and numbers of the sampling bottles (15) and the filtration bottles (16), and the hole diameters are smaller than the upper ports of the sampling bottles (15) and the lower ports of the filtration bottles (16).

6. The multi-point sampling device for seabed rock surface sediments according to claim 1, characterized in that: When the servo motor (11) is working, the centrifugal pump (10) stops working, the upper end oil cylinder (5) controls the upper end suction and filtration docking chamber (4) to move upward in a fine adjustment to release the upper interface, and at the same time, the lower end oil cylinder (7) controls the lower end suction and filtration docking chamber (8) to move downward in a fine adjustment to release the lower interface; the servo motor (11) is equipped with a rotary encoder, which can control the upper turntable (12) and the lower turntable (17) to rotate to a preset position, and simultaneously realize the replacement of the sampling bottle (15) and the suction and filtration bottle (16).

7. The multi-point sampling device for seabed rock surface sediments according to claim 1, characterized in that: When the centrifugal pump (10) is in operation, it provides power for the sampling operation, sucks the mud-water mixture into the sampling bottle (15), filters and collects the surface sediments through the permeable mesh filter cloth (20), and the filtered seawater is brought back to the seawater environment through the drainage pipe (23) through the suction bottle (16) and the centrifugal pump (10); in addition, the motor drive part of the centrifugal pump (10) is connected to the power module of the ROV.

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