CN114674614A - A device and method for in-situ layered collection of seabed sediment pore water - Google Patents

Abstract

The invention discloses an in-situ layered acquisition device and method for submarine sediment pore water, wherein the device comprises a sediment sampling mechanism, a pore water sampling mechanism and a base, the pore water sampling mechanism is fixed on the base, the sediment sampling mechanism is detachably arranged on the pore water sampling mechanism, the sediment sampling mechanism and the pore water sampling mechanism are mutually matched, so that the sediment sampling mechanism finishes sampling a target sediment after being separated from the body of the pore water sampling mechanism to obtain a sediment sample, and the pore water sampling mechanism is used for extracting pore water from different height positions of the sediment sample stored in the sediment sampling mechanism after the sediment sampling mechanism carrying the sediment sample is combined with the pore water sampling mechanism again to obtain the pore water sample and finish layered acquisition. The invention can collect pore water for different layer sections of the sediment in a layering way, the obtained collected data is real and reliable, the manufacturing cost is low, and the invention is easy to popularize and apply in a large scale.

Description

A device and method for in-situ layered collection of seabed sediment pore water

technical field

The invention relates to the technical field of pore water collection, in particular to a device and method for in-situ layered collection of seabed sediment pore water.

Background technique

In deep-sea exploration and geological research, it is necessary to collect in-situ pore water contained in deep-sea seabed mud. In the existing pore water sampling technology, the collected sediment samples are usually directly extracted to the shore-based laboratory, and then the pore water is extracted from the sediment samples to obtain the pore water samples. After the sediment samples were transferred to the shore-based laboratory, due to changes in the external physical environment, it was difficult to ensure that the pore water in this environment had the same physical and chemical properties as the in-situ seabed. Distortion situation. In addition, since the collected pore water is located at the very deep ocean bottom, in order to ensure that the pore water sample obtained from the sediment is authentic, that is, not distorted, it is necessary to have a corresponding in-situ pore water collection device.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a device and method for in-situ layered collection of seabed sediment pore water, which can solve the problem that it is difficult to truly collect pore water in situ in the prior art.

The technical scheme for realizing the purpose of the present invention is as follows: an in-situ layered collection device for pore water of seabed sediments, comprising a sediment sampling mechanism, a pore water sampling mechanism and a pedestal, the pore water sampling mechanism is fixed on the pedestal, and the sediment The sampling mechanism is detachably installed on the pore water sampling mechanism, and the sediment sampling mechanism and the pore water sampling mechanism cooperate with each other, so that the sediment sampling mechanism is separated from the pore water sampling mechanism to complete the sampling of the target sediment to obtain the sediment Sample, pore water sampling mechanism is used to extract pore water from different height positions of sediment samples stored in the sediment sampling mechanism after the sediment sampling mechanism carrying sediment samples is combined with the pore water sampling mechanism to obtain pores. Water samples, complete stratified collection.

Further, the sediment sampling mechanism includes a first connector, an end cap, a sampling cylinder, a sampling hole and a strip-shaped projection, the first connector is fixed on the end cap, and the end cap is fixedly connected to the end of the sampling tube away from the base, and the sample is taken. The other end of the cylinder is an open structure, and a number of sampling holes are dug along one side of the axial direction of the sampling cylinder. It is used for connecting with the pore water sampling mechanism, so that the sediment sampling mechanism can be detachably installed on the pore water sampling mechanism.

Further, the pore water sampling mechanism includes a sampling assembly, a triggering mechanism, a cylinder and an accommodating bin, the sampling assembly includes a spring, a sampling needle, and a collector, the accommodating bin is fixedly connected to the cylinder and is located on one side of the cylinder, and the lower end of the cylinder is And one end of the accommodating bin close to the cylinder is fixed on the base, so that the pore water sampling mechanism is fixed on the base, one end of the spring is fixedly connected to the collector, and the other end is fixedly connected to the side of the cylinder close to the accommodating bin, sampling The needle tube runs through the spring, the end of the sampling needle tube protruding from the spring is fixedly connected with the collector, the other end of the sampling needle tube is facing the sampling hole of the sediment sampling mechanism, and the collector is installed in the storage chamber along the lateral movement of the storage chamber, so that the The collector can be taken out from the accommodating bin, and the triggering mechanism is installed on the inner side wall of the accommodating bin along the longitudinal direction of the accommodating bin, so that the triggering mechanism can move along the longitudinal direction of the accommodating bin in the accommodating bin, and the triggering mechanism is located in the collector. side,

The trigger mechanism is used for the process of moving towards the bottom of the accommodating chamber under the action of external force, pushing the sampling assembly to move towards the sediment sampling mechanism, so that the sampling needle is inserted into the sediment sample in the sediment sampling mechanism integrated with the pore water sampling mechanism, so as to remove the sample from the sediment sampling mechanism. Pore water is extracted from the sediment sample, and the pore water in the sampling needle flows into and is stored in the collector.

The trigger mechanism is also used to move away from the bottom of the accommodating bin after the external force is removed, so that the sampling assembly moves away from the sediment sampling mechanism.

Further, the sampling cylinder of the sediment sampling mechanism extends into the cavity of the cylinder body through the strip-shaped projection, and the strip-shaped projection is embedded in a groove provided on an inner side wall of the cylinder body, so that the sampling cylinder can be installed movably. On the cylinder body, the sediment sampling mechanism is detachably mounted on the pore water sampling mechanism, and the end cap connected with the sampling cylinder and the first connecting piece are located at the upper end of the cylinder body.

Further, the collector includes a contact and a housing, and a sampling chamber, a fluid hose, a semi-permeable membrane, and a negative pressure chamber located in the inner cavity of the housing. The negative pressure chamber is full of hydrogel particles, and one end of the contact is fixed. It is connected to one end of the casing close to the trigger mechanism, the other end of the contact extends toward the trigger mechanism, and the distal end of the contact close to the trigger mechanism is an arc-shaped structure that is inclined downward. The lateral movement of the accommodating chamber, the spring and one end of the sampling needle tube are fixedly connected to the end of the casing close to the cylinder, and the sampling needle tube is communicated with the sampling chamber located in the inner cavity of the outer casing, and the sampling chamber is fixedly installed in the inner cavity of the outer casing and It is located at one end close to the spring, the end of the sampling chamber away from the spring is connected to one end of the fluid hose, and the other end of the fluid hose is connected to the negative pressure chamber through a semi-permeable membrane, and the semi-permeable membrane is fixed in the negative pressure chamber and close to the fluid hose. The negative pressure chamber is located in the inner cavity of the casing and is fixedly installed on the end of the casing close to the contact.

Further, a guide rail bump is fixedly connected to the outer walls on both sides of the casing, the guide rail bump is welded with the casing or has an integrated structure, the guide rail bump is arranged along the axial direction of the casing, and the two inner side walls of the accommodating bin are The guide rail grooves matched with the guide rail bumps are respectively fixedly connected with the guide rail grooves, and the guide rail bumps are movably installed on the guide rail grooves and can slide along the guide rail grooves.

Further, the trigger mechanism includes a second connecting piece, a pressure head and a rod body, the second connecting piece is fixedly connected with one end of the rod body, one end of the rod body extends into the accommodating bin and is located on one side wall of the accommodating bin, and the second connecting piece is It is located outside the accommodating bin, and the end of the rod body close to the contact is provided with a pressure head, and the pressure head is provided with a triangular structure adapted to the contact with an arc-shaped structure inclined downward, and the hypotenuse of the triangular structure is close to and facing the contact. , the trigger mechanism can move from top to bottom along the longitudinal direction of the accommodating bin, so that the trigger mechanism can reach the upward limit position and the downward limit position,

Upward limit position: the indenter is above the contact and not in contact,

Downward limit position: the indenter is facing the contact and is in full contact with the contact.

Further, a first one-way valve is also provided between the sampling needle tube and the sampling chamber, the first one-way valve is fixed on the outer side wall of the sampling chamber, and the first one-way valve is used to only allow the pore water collected by the sampling needle tube to be Flow direction to the sampling chamber to prevent the pore water in the sampling chamber from pouring back into the sampling needle tube.

A second one-way valve is also arranged between the sampling chamber and the fluid hose. The second one-way valve is fixed on the outer side wall of the end of the sampling chamber away from the spring. The second one-way valve is used to allow only the pore water in the sampling chamber to pass through. Flow into the fluid hose to prevent the pore water in the fluid hose from flowing back into the sampling chamber.

Further, at least two sampling assemblies are included in the accommodating bin, and a plurality of sampling assemblies are arranged in the accommodating bin at intervals along the longitudinal direction of the accommodating bin. Correspondingly, the trigger mechanism is provided with the same number of pressure heads as the sampling assemblies. , each indenter uniquely corresponds to a sampling component, specifically the contact of the unique corresponding sampling component.

A method for in-situ layered collection of seabed sediment pore water, comprising the following steps:

Step 1: Fix the entire device on the ROV through the coupling hole of the base, and then lower the entire device to the target seabed area through the remote control ROV until the device touches the seabed of the target seabed area;

Step 2: After the robot on the remote control ROV is connected to the first connector, pull the sediment sampling mechanism, take out the sampling cylinder of the sediment sampling mechanism, and insert the sampling cylinder into the sediment on the seabed, so that the sediment enters the In the sampling cylinder, a sediment sample is obtained, and then the sampling cylinder is pulled out from the seabed;

Step 3: Insert the sampling cylinder carrying the sediment sample into the cylinder of the pore water sampling mechanism again, wherein the strip-shaped projections on the outer side wall of the sampling cylinder are embedded in the grooves provided on an inner side wall of the cylinder body , the sampling hole on the sampling cylinder is just opposite to the through hole on the cylinder body, so that the sampling needle tube is directly facing the sampling hole, and the sampling needle tube can pass through the through hole and the sampling hole after moving forward and extend into the deposition in the sampling cylinder material sample;

Step 4: The trigger mechanism is pressed by the ROV manipulator, and the indenter on the trigger mechanism contacts the contact, thereby pushing the sampling needle to move toward the sampling cylinder, inserting the sampling needle into the sediment sample, and then extracting the pores from the sediment sample Water and pore water pass through the first one-way valve, the sampling chamber, the second one-way valve, the fluid hose and the semi-permeable membrane, and finally flow into the negative pressure chamber until the hydrogel particles in the negative pressure chamber are saturated After the water absorption is stopped, the pore water extraction is completed;

Step 5: The manipulator maintains the current pressing state, so that the trigger mechanism maintains the current position and is in the downward limit position, neither moving downward nor upward, and then the entire device is recovered and salvaged ashore through the ROV, and the manipulator is withdrawn, and the trigger mechanism moves upward. The sampling needle is reset under the action of the spring to complete the sampling.

The beneficial effects of the present invention are as follows: the present invention can collect pore water from different layers of the sediment layer by layer by arranging multiple sampling components from top to bottom, and the pore water collected in each layer is independent of each other and not chaotic, and at the same time in the whole During the collection process, the pore water is in the negative pressure chamber and will not be disturbed by the external environment. After reaching the shore-based laboratory, the authenticity and accuracy of the original data can still be maintained, thus ensuring the authenticity and reliability of the data. At the same time, since the trigger mechanism adopts independent modularization, the trigger record is simple and the operation is simple, the use of these components does not involve hardware and/or the assembly of each hardware, the cost of the whole device is low, and it can be popularized and applied on a larger scale.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of sediment sampling mechanism;

Fig. 3 is the sectional schematic diagram of removing the fixed base;

Fig. 4 is a connection schematic diagram of a collector and a spring and a sampling needle tube that are connected to the collector;

Fig. 5 is the structural schematic diagram under another angle of view;

Fig. 6 is the enlarged schematic diagram of A place in Fig. 5;

In the figure, 1-sediment sampling mechanism, 11-first connecting piece, 12-end cover, 13-sampling cylinder, 14-sampling hole, 15-stripe bump, 2-pore water sampling mechanism, 21-spring, 22- Sampling needle tube, 23- Collector, 231- Sampling chamber, 232- Shell, 2321- Rail bump, 233- Fluid hose, 234- Semi-permeable membrane, 235- Negative pressure chamber, 236- Contact, 24- Triggering mechanism, 241-second connecting piece, 242-indenter, 243-rod body, 25-cylinder body, 26-accommodating bin, 261-rail groove, 3-base, 4-connection hole.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all of the contents related to the present application. Before discussing the exemplary embodiments in greater detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts various operations (or steps) as a sequential process, many of the operations may be performed in parallel, concurrently, or concurrently. Additionally, the order of operations can be rearranged. The process may be terminated when its operation is complete, but may also have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, subroutines, and the like.

As shown in Figures 1-6, an in-situ layered collection device for seabed sediment pore water includes a sediment sampling mechanism 1, a pore water sampling mechanism 2 and a base 3, and the pore water sampling mechanism 2 is fixed on the base 3 On the top, the sediment sampling mechanism 1 is detachably installed on the pore water sampling mechanism 2 . The sediment sampling mechanism 1 is used to complete the sampling of the target sediment to obtain a sediment sample. The pore water sampling mechanism 2 is used to extract pore water from the sediment samples stored in the sediment sampling mechanism 1 to obtain pore water samples.

The sediment sampling mechanism 1 includes a first connecting piece 11, an end cover 12, a sampling cylinder 13, a sampling hole 14 and a strip-shaped projection 15. The first connecting piece 11 is fixed on the end cover 12, and the end cover 12 is threadedly connected to the sampling cylinder One end of 13 away from the base 3, the other end of the sampling cylinder 13 (that is, the end close to the base 3) is an open structure, and a number of sampling holes 14 are dug along one side of the axial direction of the sampling cylinder 13. The sampling holes 14 are equally spaced and distributed on the sampling cylinder 13 in a straight line. Of course, in actual use, the sampling holes 14 can also be arranged at non-equidistant intervals and can be distributed non-linearly, such as dislocation distribution. A strip-shaped bump 15 is fixed along the other axial side of the sampling tube 13 , and the strip-shaped bump 15 is integrally formed with the sampling tube 13 or fixed on the outer side wall of the sampling tube 13 by welding or the like.

The pore water sampling mechanism 2 includes a sampling assembly, a triggering mechanism 24, a cylinder 25 and a accommodating bin 26. The sampling assembly includes a spring 21, a sampling needle 22, and a collector 23. The accommodating bin 26 is fixedly connected with the cylinder 25 or is an integral structure and is located in the One side of the cylinder 25 , the lower end of the cylinder 25 and the end of the accommodating bin 26 close to the cylinder 25 are fixed on the base 3 , so that the pore water sampling mechanism 2 is fixed on the base 3 . One end of the spring 21 is fixedly connected to the collector 23 , and the other end is fixedly connected to the side of the cylinder 25 close to the accommodating bin 26 , so that the spring 21 is interposed between the cylinder 25 and the collector 23 and acts as a limit spring 21 . The sampling needle tube 22 penetrates the spring 21, that is, the spring 21 is sleeved on the sampling needle tube 22 but not in contact with the sampling needle tube 22. The sampling needle tube 22 will not interfere with the expansion and contraction of the spring 21, and the end of the sampling needle tube 22 extending from the spring 21 is connected to the collector. 23 is fixedly connected, and the other end of the sampling needle tube 22 is facing the sampling hole 14 of the sediment sampling mechanism 1 . The collector 23 is movably installed in the accommodating chamber 26 along the lateral direction of the accommodating chamber 26 so that the collector 23 can be taken out from the accommodating chamber 26 , and the trigger mechanism 24 is movably installed on the inner side of the accommodating chamber 26 along the longitudinal direction of the accommodating chamber 26 so that the trigger mechanism 24 can move along the longitudinal direction of the accommodating chamber 26 in the accommodating chamber 26 , and the triggering mechanism 24 is located on one side of the collector 23 .

The sampling cylinder 13 of the sediment sampling mechanism 1 protrudes into the cavity of the cylinder body 25 through the strip-shaped projections 15, and the strip-shaped projections 15 are embedded in the grooves provided on an inner side wall of the cylinder body 25, so as to allow sampling. The cylinder 13 is movably mounted on the cylinder body 25 , so that the sediment sampling mechanism 1 is detachably mounted on the pore water sampling mechanism 2 . The end cap 12 and the first connecting piece 11 connected to the sampling cylinder 13 are located at the upper end of the cylinder body 25 , that is, outside the end of the cylinder body 25 away from the base 3 .

The collector 23 includes a contact 236 and a housing 232, and a sampling chamber 231, a fluid hose 233, a semi-permeable membrane 234, and a negative pressure chamber 235 located in the inner cavity of the housing 232. One end of the contact 236 is fixedly connected to the housing 232 near the trigger One end of the mechanism 24 and the other end of the contact 236 extend toward the trigger mechanism 24 , and the distal end of the contact 236 close to the trigger mechanism 24 is an arc structure inclined downward. The housing 232 is movably installed in the accommodating bin 26 laterally and can move along the lateral direction of the accommodating bin 26. One end of the spring 21 and the sampling needle tube 22 is fixedly connected to the end of the housing 232 close to the barrel 25, and the sampling needle tube 22 is connected with the The sampling chamber 231 in the inner cavity of the housing 232 is in communication, the sampling chamber 231 is fixedly installed in the inner chamber of the housing 232 and is located at one end close to the spring 21, and the end of the sampling chamber 231 away from the spring 21 is in communication with one end of the fluid hose 233, The other end of the fluid hose 233 communicates with the negative pressure chamber 235 through a semi-permeable membrane 234 . The negative pressure chamber 235 is located in the inner cavity of the housing 232 and is fixedly installed at one end of the housing 232 close to the contacts 236 .

A guide rail bump 2321 is fixedly connected to the outer walls on both sides of the casing 232. The guide rail bump 2321 and the casing 232 are welded together or have an integral structure. Set horizontally. Two inner side walls of the accommodating bin 26 are respectively fixedly connected with guide rail grooves 261 that are adapted to the guide rail protrusions 2321. The guide rail protrusions 2321 are movably mounted on the guide rail grooves 261 and can slide along the guide rail grooves 261, thereby The sampling assembly can be moved laterally in the accommodating bin 26 , so that the sampling piece can be taken out from the accommodating bin 26 . The housing 232 is a cylindrical structure with a cavity.

The trigger mechanism 24 includes a second connector 241 , a pressure head 242 and a rod body 243 . The second connector 241 is fixedly connected to one end of the rod body 243 , and one end of the rod body 243 extends into the accommodating chamber 26 and is located on one side wall of the accommodating chamber 26 On the upper side, the second connecting piece 241 is located outside the accommodating chamber 26, the end of the rod body 243 close to the contact 236 is provided with a pressure head 242, and the pressure head 242 is provided with a triangular shape that matches the contact 236 with an arc-shaped structure inclined downward. structure, the hypotenuse of the triangular structure is close to and facing the contact 236 . The triggering mechanism 24 can move from top to bottom along the longitudinal direction of the accommodating bin 26, and the triggering mechanism 24 can move to reach the upward limit position and the downward limit position.

Upward limit position: the indenter 242 is above the contact 236 and not in contact.

Downward limit position: the indenter 242 is facing the contact 236 and is in full contact with the contact 236 .

Therefore, when the trigger mechanism 24 moves through the vehicle from top to bottom, from the upward limit position to the downward limit position, there is at least one such intermediate position:

Intermediate position: the indenter 242 is partially in contact with the contact 236 . That is, the oblique side of the indenter 242 is in contact with the downwardly inclined arc structure of the contact 236, but a part of the oblique side is outside the arc structure without contacting.

In an optional embodiment, a first one-way valve (not shown in the figure) is further provided between the sampling needle tube 22 and the sampling chamber 231 , and the first one-way valve is fixed on the outer wall of the sampling chamber 231 to The pore water collected by the sampling needle tube 22 is only allowed to flow into the sampling chamber 231 in one direction, so that the pore water in the sampling chamber 231 is prevented from being poured back into the sampling needle tube 22 . A second one-way valve (not shown in the figure) is also arranged between the sampling chamber 231 and the fluid hose 233, and the second one-way valve is fixed on the outer side wall of the end of the sampling chamber 231 away from the spring 21, so that the sampling chamber 231 The pore water inside is only allowed to flow into the fluid hose 233 in one direction, preventing the pore water in the fluid hose 233 from pouring back into the sampling chamber 231 . The negative pressure chamber 235 is filled with hydrogel particles (not shown in the figure). Of course, in actual use, it does not necessarily need to be covered with hydrogel particles, that is, not a part of the hydrogel particles in the negative pressure chamber 235 .

In an optional embodiment, the accommodating bin 26 includes at least two sampling assemblies, and a plurality of sampling assemblies are arranged in the accommodating bin 26 at intervals along the longitudinal direction of the accommodating bin 26 . Correspondingly, the trigger mechanism 24 is provided with the same number of indenters 242 as the sampling components, and each indenter 242 uniquely corresponds to a sampling component, specifically, corresponds to the contact 236 uniquely corresponding to the sampling component. When the trigger mechanism 24 moves downward from the upward limit position to the downward limit position, the plurality of indenters 242 of the trigger mechanism 24 sequentially contact the corresponding contacts 236 , that is, the lower the indenters 242 are, the sooner the contacts 242 contact the contacts. The contacts 236 are in contact with each other, and the remaining contacts 236 except the lowermost contact 236 are sequentially contacted by the plurality of indenters 242 until the contacts 236 corresponding to the lower limit position are contacted.

In an optional embodiment, the cylinder body 25 is a cylindrical structure with a cavity, and the accommodating bin 26 is a rectangular structure with a cavity.

Working principle: Using ROV (remotely controlled unmanned vehicle), such as China's "Haidou No. 1" full-sea autonomous remote control vehicle, the device is sent to the target seabed area, and then the manipulator on the ROV and the first connector are remotely controlled. 11 is connected, so that the sediment sampling mechanism 1 is taken out from the pore water sampling mechanism 2 by pulling the first connecting piece 11, and then the sampling cylinder 13 of the sediment sampling mechanism 1 is inserted into the sediment, so that the sediment enters the sampling cylinder 13 in the cavity. Then, insert the sampling cylinder 13 carrying the sediment sample into the cylinder body 25 again, the manipulator on the ROV is disconnected from the first connecting piece 11 or use the second continuing hand, the manipulator on the ROV is connected with the second connecting piece 241 To connect, the manipulator presses down the second connecting piece 241, so that the rod body 243 moves downward from the upper limit position until it reaches the downward limit position. After reaching the downward limit position, the manipulator keeps the second connecting piece 241 neither moving down nor moving down. The rod body 243 connected with the second connecting member 241 is in the current fixed position, and the indenter 242 on the rod body 243 is in contact with the contact 236 and continuously pushes the indenter 242 along the horizontal direction of the accommodating bin 26 by rebounding upward (ie, moving) (that is, laterally) moving, synchronously, the spring 21 is in a compressed state, which in turn pushes the sampling needle 22 to move toward the sampling hole 14 and extends into the sediment in the sampling cylinder 13, and the sampling needle 22 extracts pore water from the sediment , to obtain a pore water sample, and then when the pressure head 242 moves down to the lower end of the contact head 236, the contact head 236 moves horizontally toward the rod body 243 again under the recovery rebound force of the spring 21, and the pore water sample The sampling needle 22 returns again to be located outside the sampling cylinder 13 . Simultaneously, in the process of extracting pore water from the sampling needle 22, the pore water sample in the sampling needle 22 flows into the sampling chamber 231 after passing through the first one-way valve, and then the pore water sample flowing out from the sampling chamber 231 passes through the second one-way valve. The one-way valve flows through the fluid hose 233 , passes through the semi-permeable membrane 234 , and finally flows into the negative pressure chamber 235 . After the hydrogel particles in the negative pressure chamber 235 absorb water, a negative pressure will be formed in the negative pressure chamber 235, so that the pore water sample in the sampling needle 22 is continuously sucked until the water absorption of the hydrogel particles reaches saturation. It stops flowing into the negative pressure chamber 235. During the whole process from the start of the extraction of the pore water sample to the complete inflow of the pore water sample into the negative pressure chamber 235, it reaches the downward limit position state, because the rod body 243 is in the current position under the action of the manipulator. In this state, the oblique side of the indenter 242 is always completely in contact with the downwardly inclined arc structure of the contactor 236, that is, the indenter 242 is neither above the contactor 236 nor below the contactor 236, but is It just opposes the contact head 236 to prevent the rod body 243 from being pulled out after the indenter 242 is under the contact head 236 due to pressing down too deeply, resulting in the inability to be used again next time. Of course, if it is only used for one-time use, it is also possible for the indenter 242 to reach the bottom of the contact 236, that is, it is not necessary to maintain the second connecting piece 241. It is sufficient that a required number of pore water samples can be collected in the negative pressure chamber 235 . Alternatively, the second connecting member 241 is maintained for a small period of time from the upward limit position to the downward limit position, so that the negative pressure chamber 235 can collect the required number of pore water samples, and then the pressure head 242 reaches Below the contacts 236 . All of the above can be selected according to the actual situation. Therefore, the number of pore water samples collected can be controlled by setting the inner diameter of the sampling needle tube 22, the sampling chamber 231, the fluid hose 233, the negative pressure chamber 235, etc., as well as the number of hydrogel layouts, which can be set according to the actual situation, I won't go into details here.

After completing the sampling of the interstitial water sample in the sampling hole 14, the entire device is recovered and salvaged ashore by the ROV. The ROV continues to stop acting on the second manipulator. The indenter 242 on the rod body 243 cannot push the contact 236 without any force. The horizontal movement is horizontally away from the rod body 243 , and at the same time, under the reset action of the spring 21 , the contact 236 moves toward the rod body 243 instead, thereby completing the sampling.

The invention can be well applied to marine environment monitoring and detection equipment, can obtain data required for marine environment monitoring or detection by collecting pore water samples, and can be well applied to equipment used in seawater platform-based observation stations , to improve the ability to collect pore water samples, especially to meet the in situ pore water collection of very deep seafloor.

The present invention can collect pore water in different layers of sediment by arranging a plurality of sampling components from top to bottom, and the pore water collected in each layer is independent of each other and not chaotic. The negative pressure chamber 235 will not be disturbed by the external environment, and the authenticity and accuracy of the original data can still be maintained after reaching the shore-based laboratory, thus ensuring the authenticity and reliability of the data. At the same time, the trigger mechanism 24 is independent and modular, the trigger record is simple and the operation is simple, the use of these components does not involve hardware and/or the assembly of each hardware, the whole device is low in cost, and can be popularized and applied on a larger scale.

Based on the above-mentioned in-situ layered collection device for seabed sediment pore water, the present invention also provides a collection method, comprising the following steps:

Step 1: Fix the whole device on the ROV through the coupling hole 4 of the base 3, for example, install it on the working platform of the ROV, and then lower the whole device to the target seabed area through the remote control ROV until the device touches the target seabed area of the seabed.

Step 2: The manipulator on the remote control ROV is connected to the first connector 11 by grabbing or other means, then pulls the sediment sampling mechanism 1, takes out the sampling cylinder 13 of the sediment sampling mechanism 1, and inserts the sampling cylinder 13 into the In the sediments on the seabed, the sediments enter the sampling cylinder 13 to obtain a sediment sample, and then the sampling cylinder 13 is pulled out from the seabed. Simultaneously, the sediment sample in the sampling cylinder 13 is pulled out along with the sampling cylinder 13 .

Step 3: Insert the sampling cylinder 13 carrying the sediment sample into the cylinder body 25 of the pore water sampling mechanism 2 again, wherein the strip-shaped protrusions 15 on the outer side wall of the sampling cylinder 13 are embedded in a cylinder body 25. The groove on the inner side wall plays a positioning role. At this time, the sampling hole 14 on the sampling cylinder 13 is just opposite to the through hole on the cylinder body 25, so that the sampling needle tube 22 is facing the sampling hole 14, and the sampling needle tube 22 After moving forward, it can pass through the through hole and the sampling hole 14 and then extend into the sediment sample in the sampling cylinder 13 .

Step 4: The trigger mechanism 24 is pressed by the ROV manipulator, and the indenter 242 on the trigger mechanism 24 is in contact with the contact 236, thereby pushing the sampling needle 22 to move in the direction of the sampling cylinder 13, and the sampling needle 22 is inserted into the sediment sample, and then removed from the sample. Pore water is extracted from the sediment sample, and the pore water passes through the first one-way valve, the sampling chamber 231, the second one-way valve, the fluid hose 233 and the semi-permeable membrane 234, and finally flows into the negative pressure chamber 235 until After the hydrogel particles in the negative pressure chamber 235 reach saturation and stop absorbing water, the extraction of pore water is completed.

Step 5: The manipulator maintains the current pressing state, so that the trigger mechanism 24 maintains the current position and is at the downward limit position. At this time, the hypotenuse of the indenter 242 is in full contact with the arc structure of the contact 236 to prevent the lateral movement of the sampling assembly. Move neither downward nor upward, then the whole device is recovered and salvaged ashore by the ROV, and the manipulator is withdrawn, the trigger mechanism 24 moves upward, and the sampling needle 22 is reset under the action of the spring 21 (ie, returns to the initial position), and the sampling is completed. .

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The in-situ layered acquisition device for the pore water of the submarine sediment is characterized by comprising a sediment sampling mechanism, a pore water sampling mechanism and a base, wherein the pore water sampling mechanism is fixed on the base and detachably installed on the pore water sampling mechanism, the sediment sampling mechanism and the pore water sampling mechanism are matched with each other, so that the sediment sampling mechanism finishes sampling a target sediment after the sediment sampling mechanism is separated from the pore water sampling mechanism to obtain a sediment sample, and the pore water sampling mechanism is used for extracting the pore water from different height positions of the sediment sample stored in the sediment sampling mechanism after the sediment sampling mechanism carrying the sediment sample is combined with the pore water sampling mechanism again to obtain the pore water sample and finish layered acquisition.

2. The in-situ layered collection device for pore water of submarine sediments according to claim 1, wherein the sediment sampling mechanism comprises a first connecting piece, an end cover, a sampling cylinder, sampling holes and a strip-shaped lug, the first connecting piece is fixed on the end cover, the end cover is fixedly connected with one end of the sampling cylinder far away from the base, the other end of the sampling cylinder is of an open structure, a plurality of sampling holes are dug along one side of the axial direction of the sampling cylinder, the strip-shaped lug is fixedly connected with the other side of the axial direction of the sampling cylinder, and the strip-shaped lug is used for being connected with the pore water sampling mechanism, so that the sediment sampling mechanism can be detachably mounted on the pore water sampling mechanism.

3. The submarine sediment pore water in-situ layered collection device according to claim 2, wherein the pore water sampling mechanism comprises a sampling assembly, a trigger mechanism, a barrel and a containing bin, the sampling assembly comprises a spring, a sampling needle tube and a collector, the containing bin is fixedly connected with the barrel and is positioned on one side of the barrel, the lower end of the barrel and one end of the containing bin close to the barrel are fixed on the base so as to fix the pore water sampling mechanism on the base, one end of the spring is fixedly connected with the collector, the other end of the spring is fixedly connected with one side of the barrel close to the containing bin, the sampling needle tube penetrates through the spring, one end of the sampling needle tube extending out of the spring is fixedly connected with the collector, the other end of the sampling needle tube is opposite to a sampling hole of the sediment sampling mechanism, the collector is movably installed in the containing bin along the transverse direction of the containing bin so as to be capable of taking out the collector from the containing bin, the trigger mechanism is movably arranged on the inner side wall of the accommodating bin along the longitudinal direction of the accommodating bin so as to enable the trigger mechanism to move along the longitudinal direction of the accommodating bin in the accommodating bin, the trigger mechanism is positioned at one side of the collector,

the trigger mechanism is used for pushing the sampling assembly to move towards the sediment sampling mechanism in the process of moving towards the bottom of the containing bin under the action of external force, so that the sampling needle tube is inserted into a sediment sample in the sediment sampling mechanism combined with the pore water sampling mechanism to extract pore water from the sediment sample, the pore water in the sampling needle tube flows into the collector and is stored in the collector,

the trigger mechanism is also used for moving towards the process of being far away from the bottom of the accommodating bin after the external force is relieved, so that the sampling assembly moves towards the direction far away from the sediment sampling mechanism.

4. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 3, wherein the sampling tube of the sediment sampling mechanism extends into the cavity of the cylinder body through a strip-shaped projection, the strip-shaped projection is embedded in a groove arranged on one inner side wall of the cylinder body, so that the sampling tube is movably arranged on the cylinder body, the sediment sampling mechanism is further detachably arranged on the pore water sampling mechanism, and the end cover connected with the sampling tube and the first connecting piece are positioned at the upper end of the cylinder body.

5. The device for in-situ layered collection of pore water of seafloor sediments as claimed in claim 4, wherein the collector comprises a contact, a shell, a sampling bin, a fluid hose, a semipermeable membrane and a negative pressure bin which are arranged in an inner cavity of the shell, hydrogel particles are distributed in the negative pressure bin, one end of the contact is fixedly connected with one end of the shell close to the trigger mechanism, the other end of the contact extends towards the trigger mechanism, the far end of the contact close to the trigger mechanism is of an arc-shaped structure which inclines downwards, the shell is transversely and movably arranged in the containing bin and can move along the transverse direction of the containing bin, one end of the spring and one end of the sampling needle tube are fixedly connected with one end of the shell close to the barrel, the sampling needle tube is communicated with the sampling bin which is arranged in the inner cavity of the shell, the sampling bin is fixedly arranged in the inner cavity of the shell and is located at one end close to the spring, and one end of the sampling bin, which is far away from the spring, is communicated with one end of the fluid hose, the other end of the fluid hose is communicated with the negative pressure bin through a semipermeable membrane, the semipermeable membrane is fixed on the outer side wall of the negative pressure bin close to the fluid hose and extends into the fluid hose, and the negative pressure bin is located in the inner cavity of the shell and is fixedly installed at one end, close to the contact, of the shell.

6. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 5, wherein the outer walls of the two sides of the housing are respectively and fixedly connected with a guide rail projection, the guide rail projections are welded with the housing or are of an integral structure, the guide rail projections are arranged along the axial direction of the housing, the two inner side walls of the accommodating bin are respectively and fixedly connected with guide rail grooves matched with the guide rail projections, and the guide rail projections are movably mounted on the guide rail grooves and can slide along the guide rail grooves.

7. The device for in-situ layered collection of pore water of seafloor sediments as claimed in claim 6, wherein the trigger mechanism comprises a second connecting piece, a pressure head and a rod body, the second connecting piece is fixedly connected with one end of the rod body, one end of the rod body extends into the accommodating bin and is positioned on one side wall of the accommodating bin, the second connecting piece is positioned outside the accommodating bin, the pressure head is arranged at one end of the rod body close to the contact, the pressure head is provided with a triangular structure matched with the contact in an arc structure with an inclined downward direction, the inclined edge of the triangular structure is close to and opposite to the contact, the trigger mechanism can move from top to bottom along the longitudinal direction of the accommodating bin, so that the trigger mechanism can reach an upper limit position and a lower limit position,

the upper limit position: the pressure head is positioned above the contact head and is not contacted,

the descending limit position: the pressure head faces the contact and is in full contact with the contact.

8. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 7, wherein a first one-way valve is further arranged between the sampling needle tube and the sampling bin, the first one-way valve is fixed on the outer side wall of the sampling bin, the first one-way valve is used for only allowing the pore water collected by the sampling needle tube to flow to the sampling bin in one way and preventing the pore water in the sampling bin from flowing back into the sampling needle tube,

still be provided with the second check valve between sampling storehouse and the fluid hose, the second check valve is fixed on the lateral wall of sampling storehouse keeping away from spring one end, and the second check valve is used for only allowing the one-way flow direction of the pore water in the sampling storehouse to the fluid hose in, prevents that the pore water in the fluid hose from flowing backward to the sampling storehouse in.

9. The in-situ layered acquisition device for pore water of submarine sediments according to claim 1, wherein the containing bin comprises at least two or more sampling assemblies, the sampling assemblies are arranged in the containing bin at intervals along the longitudinal direction of the containing bin, correspondingly, the triggering mechanism is internally provided with the pressure heads with the same number as the sampling assemblies, each pressure head uniquely corresponds to one sampling assembly, and particularly the contact of the uniquely corresponding sampling assembly corresponds to the pressure head of the triggering mechanism.

10. An in-situ layered collection method for pore water of submarine sediments is characterized by comprising the following steps:

step 1: fixedly mounting the whole device for in-situ layered collection of pore water of seafloor sediments as claimed in claim 9 on an ROV through a coupling hole of a base, and then lowering the whole device to a target seafloor area by remotely controlling the ROV until the device contacts the seafloor of the target seafloor area;

step 2: after a manipulator on the remote control ROV is connected with the first connecting piece, the sediment sampling mechanism is lifted, a sampling cylinder of the sediment sampling mechanism is taken out, the sampling cylinder is inserted into the sediment on the seabed, so that the sediment enters the sampling cylinder to obtain a sediment sample, and then the sampling cylinder is pulled out from the seabed;

and step 3: the sampling tube loaded with sediment samples is inserted into the tube body of the pore water sampling mechanism again, wherein the strip-shaped convex block on the outer side wall of the sampling tube is embedded into the groove arranged on one inner side wall of the tube body, the sampling hole on the sampling tube is just right opposite to the through hole on the tube body, so that the sampling needle tube is right opposite to the sampling hole, and the sampling needle tube can pass through the through hole and the sampling hole after moving forwards and then extend into the sediment samples in the sampling tube;

and 4, step 4: the trigger mechanism is pressed through the ROV manipulator, a pressure head on the trigger mechanism is in contact with a contact head, so that a sampling needle tube is pushed to move towards the direction of a sampling cylinder, the sampling needle tube is inserted into a sediment sample, and then pore water is extracted from the sediment sample, and finally flows into the negative pressure bin after passing through the first one-way valve, the sampling bin, the second one-way valve and the fluid hose and passing through the semipermeable membrane until hydrogel particles in the negative pressure bin are saturated and water absorption is stopped, so that pore water extraction is completed;

and 5: the manipulator maintains the current state of pressing for trigger mechanism maintains current position and is in down extreme position, neither moves down nor upward movement, then retrieves whole device through the ROV and salvages ashore, and withdraws the manipulator, and trigger mechanism moves up, and the sampling needle pipe resets under the effect of spring, accomplishes the sampling.

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