CN114674614B - In-situ layered collection device and method for pore water of submarine sediment - 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

In-situ layered collection device and method for pore water of submarine sediment

Technical Field

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

Background

In deep sea exploration and geological research work, pore water contained in deep sea bottom mud needs to be collected in situ. In the existing pore water sampling technology, a collected sediment sample is usually extracted directly to a shore-based laboratory, and then pore water is extracted from the sediment sample to obtain a pore water sample. After the sediment sample is transferred to a shore-based laboratory, due to the change of the external physical environment, the physical and chemical characteristics of pore water and seabed in situ in the environment are difficult to ensure, in-situ collection is not realized, and the acquired data is distorted. Moreover, since the collected pore water is located at the bottom of the extremely deep ocean, in order to ensure that the pore water sample that can be obtained from the sediment is real, i.e., not distorted, a corresponding in-situ pore water collecting device is necessary.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an in-situ layered collection device and method for pore water of submarine sediments, which can solve the problem that the pore water is difficult to be really collected in situ in the prior art.

The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a submarine sediment pore water in situ layering collection system, including deposit sampling mechanism, pore water sampling mechanism and base, pore water sampling mechanism fixes on the base, deposit sampling mechanism detachably installs on pore water sampling mechanism, deposit sampling mechanism and pore water sampling mechanism mutually support, so that deposit sampling mechanism accomplishes the sample to target deposit from the separation of pore water sampling mechanism after, in order to obtain the deposit sample, pore water sampling mechanism is used for carrying deposit sample's deposit sampling mechanism once more with the cooperation of pore water sampling mechanism after, extract the pore water from the not co-altitude position of the deposit sample that deposit sampling mechanism stores, obtain the pore water sample, accomplish the layering collection.

Further, sediment sampling mechanism includes first connecting piece, end cover, sampler barrel, sampling hole and bar lug, and first connecting piece is fixed on the end cover, and the one end of base is kept away from to end cover fixed connection sampler barrel, and the other end of sampler barrel is open structure, digs along one side of the axial direction of sampler barrel and is equipped with a plurality of sampling holes, along the axial opposite side fixed connection of sampler barrel bar lug, bar lug are used for being connected with pore water sampling mechanism to make sediment sampling mechanism detachably install on pore water sampling mechanism.

Furthermore, the pore water sampling mechanism comprises a sampling component, a trigger mechanism, a barrel and a containing bin, the sampling component comprises a spring, a sampling needle tube and a collector, the containing bin is fixedly connected with the barrel and is positioned at 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 that the pore water sampling mechanism is fixed 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 just opposite to a sampling hole of the sediment sampling mechanism, the collector is movably arranged 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 containing bin along the longitudinal direction of the containing bin, so that the trigger mechanism can move in the containing bin along the longitudinal direction of the containing 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.

Further, in sediment sampling mechanism's sampling tube stretched into the cavity of barrel through the bar lug, the bar lug embedding set up on the recess on an inside wall of barrel to make sampling tube movable mounting on the barrel, and then make sediment sampling mechanism detachably install on pore water sampling mechanism, the end cover and the first connecting piece of being connected with the sampling tube were located the upper end of barrel.

Furthermore, the collector comprises a contact and a shell, as well as a sampling bin, a fluid hose, a semipermeable membrane and a negative pressure bin which are positioned 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, which is close to the trigger mechanism, the other end of the contact extends towards the trigger mechanism, the far end of the contact, which is close to the trigger mechanism, is of an arc-shaped structure with a downward inclination, 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, which is close to the barrel, the sampling needle tube is communicated with the sampling bin positioned in the inner cavity of the shell, the sampling bin is fixedly arranged in the inner cavity of the shell and positioned at one end, which is far away from the spring, is communicated with one end of the fluid hose, and the other end of the fluid hose is communicated with the negative pressure bin through the 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 positioned in the inner cavity of the shell and is fixedly installed at one end of the shell close to the contact.

Furthermore, the outer walls of the two sides of the shell are respectively and fixedly connected with a guide rail convex block, the guide rail convex blocks and the shell are welded together or are of an integral structure, the guide rail convex blocks are arranged along the axial direction of the shell, guide rail grooves matched with the guide rail convex blocks are respectively and fixedly connected onto the two inner side walls of the accommodating bin, and the guide rail convex blocks are movably arranged on the guide rail grooves and can slide along the guide rail grooves.

Furthermore, 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, close to the contact, of the rod body, the pressure head is provided with a triangular structure matched with the contact which is of an arc-shaped structure in 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 uplink limit position and a downlink limit position,

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

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

Furthermore, a first one-way valve is 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 and is used for only allowing pore water collected by the sampling needle tube to flow into 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 of 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.

Further, hold including more than two at least sampling component in the storehouse, a plurality of sampling component set up in holding the storehouse along the longitudinal direction interval that holds the storehouse, and is corresponding, be provided with in the trigger mechanism with the same quantity's of sampling component pressure head, every pressure head only corresponds a sampling component, specifically is that only the contact that corresponds sampling component corresponds.

An in-situ layered collection method for pore water of submarine sediments comprises the following steps:

step 1: fixedly mounting the entire apparatus on the ROV through the coupling hole of the base, and then lowering the entire apparatus to the target seafloor area through the remote ROV until the apparatus 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.

The invention has the beneficial effects that: according to the invention, the plurality of sampling assemblies are arranged from top to bottom, so that pore water can be collected in different intervals of the sediment in a layered manner, the pore water collected in each interval is independent and not disordered, meanwhile, in the whole collection process, the pore water is in the negative pressure bin and cannot be interfered by the external environment, and the truth and accuracy of original data can be maintained after the pore water reaches a shore-based laboratory, so that the trueness and reliability of the data are ensured. Meanwhile, the trigger mechanism adopts independent modularization, the trigger recording is simple and convenient, the operation is simple and convenient, the components do not relate to the assembly of hardware and/or each hardware, the whole device has low manufacturing cost, and the trigger mechanism can be popularized and applied on a larger scale.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic view of the structure of the sediment sampling mechanism;

FIG. 3 is a schematic cross-sectional view of the mounting base removed;

FIG. 4 is a schematic view of the connection of the collector and the sampling needle tube including the spring connected to the collector;

FIG. 5 is a schematic view of another view angle;

FIG. 6 is an enlarged schematic view at A in FIG. 5;

in the figure, 1-sediment sampling mechanism, 11-first connecting piece, 12-end cover, 13-sampling cylinder, 14-sampling hole, 15-strip-shaped lug, 2-pore water sampling mechanism, 21-spring, 22-sampling needle tube, 23-collector, 231-sampling bin, 232-shell, 2321-guide rail lug, 233-fluid hose, 234-semipermeable membrane, 235-negative pressure bin, 236-contact, 24-trigger mechanism, 241-second connecting piece, 242-pressure head, 243-rod body, 25-cylinder body, 26-containing bin, 261-guide rail groove, 3-base and 4-linking hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present application are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, subprograms, and the like.

As shown in fig. 1-6, the in-situ layered collection device for the pore water of the seabed sediment comprises a sediment sampling mechanism 1, a pore water sampling mechanism 2 and a base 3, wherein the pore water sampling mechanism 2 is fixed on the base 3, and the sediment sampling mechanism 1 is detachably arranged on the pore water sampling mechanism 2. The sediment sampling mechanism 1 is used for completing sampling of target sediment to obtain sediment samples. The pore water sampling mechanism 2 is used for extracting pore water from sediment samples stored in the sediment sampling mechanism 1 to obtain pore water samples.

Sediment sampling mechanism 1 includes first connecting piece 11, end cover 12, sampler barrel 13, sampling hole 14 and bar lug 15, first connecting piece 11 is fixed on end cover 12, end cover 12 threaded connection is in the one end that base 3 was kept away from to sampler barrel 13, the other end of sampler barrel 13 (be close to the one end of base 3 promptly) is open structure, dig along one side of the axial direction of sampler barrel 13 and be equipped with a plurality of sampling holes 14, each sampling hole 14 distributes on sampler barrel 13 equidistantly and is a straight line, of course, when actually using, sampling hole 14 also can adopt the setting of non-equidistant and can non-linear distribution, for example, the dislocation distribution sets up etc.. A strip-shaped convex block 15 is fixed on the other axial side of the sampling tube 13, and the strip-shaped convex block 15 and the sampling tube 13 are of an integral structure or are fixed on the outer side wall of the sampling tube 13 by welding and other modes.

Pore water sampling mechanism 2 includes sampling subassembly, trigger mechanism 24, barrel 25 and holds storehouse 26, and sampling subassembly includes spring 21, sampling needle 22, collector 23, holds storehouse 26 and barrel 25 fixed connection or structure as an organic whole and lies in one side of barrel 25, and the lower extreme of barrel 25 and the one end that holds storehouse 26 that is close to barrel 25 are fixed on base 3 to fix pore water sampling mechanism 2 on base 3. One end of the spring 21 is fixedly connected with the collector 23, and the other end of the spring 21 is fixedly connected with one side of the cylinder 25 close to the accommodating bin 26, so that the spring 21 is arranged between the cylinder 25 and the collector 23 and plays a role of limiting the spring 21. The sampling needle tube 22 penetrates through the spring 21, that is, the spring 21 is sleeved on the sampling needle tube 22 but is not contacted with the sampling needle tube 22, the sampling needle tube 22 does not interfere with the extension and contraction of the spring 21, one end of the sampling needle tube 22 extending out from the spring 21 is fixedly connected with the collector 23, and the other end of the sampling needle tube 22 is over against the sampling hole 14 of the sediment sampling mechanism 1. Collector 23 is movably installed in accommodating chamber 26 along the transverse direction of accommodating chamber 26 so that collector 23 can be taken out of accommodating chamber 26, and trigger mechanism 24 is movably installed on the inner side wall of accommodating chamber 26 along the longitudinal direction of accommodating chamber 26 so that trigger mechanism 24 can move in accommodating chamber 26 along the longitudinal direction of accommodating chamber 26, and trigger mechanism 24 is located at one side of collector 23.

Sampling tube 13 of deposit sampling mechanism 1 stretches into the cavity of barrel 25 through bar lug 15, and bar lug 15 embedding sets up on the recess on the inside wall of barrel 25 to make sampling tube 13 movable mounting on barrel 25, and then make deposit sampling mechanism 1 detachably install on pore water sampling mechanism 2. The end cap 12 and the first connector 11 connected to the sampling tube 13 are located at the upper end of the cylinder 25, that is, outside the end of the cylinder 25 remote from the base 3.

The collector 23 comprises 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 which are positioned in the inner cavity of the housing 232, wherein one end of the contact 236 is fixedly connected to one end of the housing 232 close to the trigger mechanism 24, the other end of the contact 236 extends towards the trigger mechanism 24, and the distal end of the contact 236 close to the trigger mechanism 24 is of an arc structure inclining downwards. Housing 232 is transversely movably mounted in accommodating chamber 26 and can move along the transverse direction of accommodating chamber 26, one end of spring 21 and sampling needle tube 22 is fixedly connected to one end of housing 232 close to barrel 25, and sampling needle tube 22 is communicated with sampling chamber 231 located in the inner cavity of housing 232, sampling chamber 231 is fixedly mounted in the inner cavity of housing 232 and located at one end close to spring 21, one end of sampling chamber 231 far from spring 21 is communicated and connected with one end of fluid hose 233, the other end of fluid hose 233 is communicated and connected with negative pressure chamber 235 through semipermeable membrane 234, and semipermeable membrane 234 is fixed on the outer side wall of negative pressure chamber 235 close to fluid hose 233 and extends into fluid hose 233. A vacuum chamber 235 is located in the interior cavity of the housing 232 and is fixedly mounted to the housing 232 at an end thereof adjacent the contact 236.

The outer walls of the two sides of the housing 232 are respectively and fixedly connected with a guide rail protruding block 2321, the guide rail protruding blocks 2321 are welded with the housing 232 together or are of an integral structure, and the guide rail protruding blocks 2321 are axially arranged along the housing 232, that is, transversely arranged. Guide groove 261 matched with guide lugs 2321 is fixedly connected to two inner side walls of the accommodating chamber 26 respectively, and the guide lugs 2321 are movably mounted on the guide groove 261 and can slide along the guide groove 261, so that the sampling assembly can transversely move in the accommodating chamber 26, and the sampling member can be taken out of the accommodating chamber 26. The housing 232 is a cylindrical structure with a cavity.

The trigger mechanism 24 includes a second connecting member 241, a pressing head 242 and a rod 243, the second connecting member 241 is fixedly connected to one end of the rod 243, one end of the rod 243 extends into the accommodating chamber 26 and is located on one side wall of the accommodating chamber 26, the second connecting member 241 is located outside the accommodating chamber 26, the pressing head 242 is arranged at one end of the rod 243 close to the contact 236, the pressing head 242 is provided with a triangular structure matched with the contact 236 which is of an arc structure inclined downward, and the oblique side of the triangular structure is close to and opposite to the contact 236. The trigger mechanism 24 is movable from top to bottom along the longitudinal direction of the holding bin 26, and the trigger mechanism 24 is movable to an upper limit position and a lower limit position.

The upper limit position: the ram 242 is positioned above and out of contact with the contact 236.

The descending limit position: the ram 242 faces the contact 236 and makes full contact with the contact 236.

Thus, during the movement of the triggering mechanism 24 along the vehicle from top to bottom, starting from the upper extreme position to the lower extreme position, there is at least one such intermediate position:

the middle position: the ram 242 is in contact with the contact 236 portion. That is, the beveled edge of the ram 242 contacts the angled downward arc of the contact 236, but a portion of the beveled edge is outside of the arc and not in contact.

In an alternative embodiment, a first check valve (not shown) is disposed between the sampling needle 22 and the sampling compartment 231, and the first check valve is fixed on the outer sidewall of the sampling compartment 231, so that the pore water collected by the sampling needle 22 only allows one-way flow to the sampling compartment 231, and the pore water in the sampling compartment 231 is prevented from flowing back into the sampling needle 22. A second check valve (not shown) is further disposed between the sampling chamber 231 and the fluid hose 233, and the second check valve is fixed on the outer sidewall of the sampling chamber 231 at the end far away from the spring 21, so that the pore water in the sampling chamber 231 only allows one-way flow to the fluid hose 233, and the pore water in the fluid hose 233 is prevented from flowing back into the sampling chamber 231. Hydrogel particles (not shown) are distributed in the negative pressure bin 235, and certainly, in actual use, the hydrogel particles do not need to be distributed, that is, a part of the hydrogel particles is not distributed in the negative pressure bin 235.

In an alternative embodiment, at least two or more sampling assemblies are included in the accommodating chamber 26, and a plurality of sampling assemblies are disposed at intervals in the longitudinal direction of the accommodating chamber 26 in the accommodating chamber 26. Correspondingly, the triggering mechanism 24 is provided with the same number of the pressing heads 242 as the sampling assemblies, and each pressing head 242 uniquely corresponds to one sampling assembly, specifically, the contact 236 of the uniquely corresponding sampling assembly. During the downward movement of the trigger mechanism 24 from the upward limit position to the downward limit position, the plurality of pressing heads 242 of the trigger mechanism 24 sequentially contact the corresponding contacts 236, i.e., the lower pressing head 242 contacts the contacts 236 earlier, and the remaining contacts 236 except the lowermost contact 236 are sequentially contacted by the plurality of pressing heads 242 until the corresponding contacts 236 contact the downward limit position.

In an alternative embodiment, cartridge 25 is a cylindrical structure with a cavity and holding chamber 26 is a rectangular structure with a cavity.

The working principle is as follows: the device is fed into a target seabed area by using an ROV (remote operated unmanned vehicle), such as a Chinese full-sea depth autonomous remote operated vehicle, and then a manipulator on the remote operated ROV is connected with a first connecting piece 11, so that the sediment sampling mechanism 1 is taken out of the pore water sampling mechanism 2 by pulling the first connecting piece 11, and then a sampling cylinder 13 of the sediment sampling mechanism 1 is inserted into the sediment, so that the sediment enters a cavity of the sampling cylinder 13. Then, the sampling tube 13 carrying the sediment sample is inserted into the tube 25 again, the manipulator on the ROV is disconnected from the first connecting member 11 or a second continuing hand is used, the manipulator on the ROV is connected with the second connecting member 241, the manipulator presses the second connecting member 241 downwards, so that the rod 243 moves downwards from the upper limit position until the lower limit position is reached, after the lower limit position is reached, the manipulator maintains the second connecting member 241 neither moving downwards nor rebounding upwards (i.e. moving), so that the rod 243 connected with the second connecting member 241 is in the current fixed position, the pressure head 242 on the rod 243 is in contact with the contact 236 and continuously pushes the pressure head 242 to move along the horizontal direction (i.e. transverse direction) of the accommodating chamber 26, synchronously, the spring 21 is in a compressed state, so that the sampling tube 22 is pushed to move towards the sampling hole 14 and extend into the sediment of the sampling tube 13, the sampling needle 22 extracts pore water from the sediment to obtain a pore water sample, and then when the ram 242 moves down to the lower end of the contact 236, the contact 236 moves horizontally again toward the rod 243 under the rebound force of the spring 21, and the sampling needle 22 with the pore water sample returns to be located outside the sampling cylinder 13. Synchronously, in the process of extracting pore water from the sampling needle tube 22, the pore water sample in the sampling needle tube 22 flows into the sampling bin 231 through the first one-way valve, and then the pore water sample flowing out of the sampling bin 231 flows through the fluid hose 233 through the second one-way valve, passes through the semi-permeable membrane 234, and finally flows into the negative pressure bin 235. After the hydrogel particles in the negative pressure bin 235 absorb water, negative pressure is formed in the negative pressure bin 235, thereby continuously sucking the pore water sample in the sampling needle tube 22 until the hydrogel particles reach saturation, the pore water sample stops flowing into the negative pressure bin 235, and reaches the descending limit position state in the whole process from the beginning of extracting the pore water sample to the time when the pore water sample completely flows into the negative pressure bin 235, since the rod 243 is maintained in the current position by the robot, the bevel edge of the ram 242 always completely interferes with the downward slope arc of the contact 236, i.e., the ram 242 is not located either above the contact 236 or below the contact 236, but rather just against the contact 236 to prevent the ram 242 from being able to pull out the stem 243 after being under the contact 236 and not being able to be reused the next time it is pressed too far downward. Of course, if it is only used for one-time, it is also possible that the pressure head 242 reaches below the contact 236, that is, without maintaining the second connecting member 241, it is only necessary to ensure that the required amount of pore water sample can be collected in the negative pressure chamber 235 in the period from the upward limit position to the downward limit position of the rod 243. Or for a certain small period of time from the upper limit position to the lower limit position, the second connection 241 is maintained so that the negative pressure chamber 235 can collect the required amount of pore water sample, and then the pressure head 242 reaches under the contact 236. The above can be selected according to actual conditions. Therefore, the number of pore water samples can be controlled by setting the inner diameter size of the sampling needle tube 22, the sampling bin 231, the fluid hose 233, the negative pressure bin 235 and the like, and setting the arrangement number of the hydrogel, which can be set according to actual conditions, and will not be described herein.

After sampling of the water sample in the gap of the sampling hole 14 is completed, the whole device is recovered and salvaged ashore by the ROV, the ROV continues to stop acting on the second mechanical arm, the pressure head 242 on the rod body 243 cannot push the contact 236 to horizontally move horizontally in the direction away from the rod body 243 under the condition of no acting force, and meanwhile, under the reset action of the spring 21, the contact 236 moves towards the rod body 243 instead, so that the sampling is completed.

The invention can be well applied to marine environment monitoring and detecting equipment, can obtain data required by marine environment monitoring or detection by collecting pore water samples, can be well applied to equipment used by a seawater platform base observation station, improves the capacity of collecting pore water samples, and particularly meets the requirement of in-situ pore water collection of an extremely deep seabed.

According to the invention, the plurality of sampling assemblies are arranged from top to bottom, so that pore water can be collected from different layers of sediments in a layering manner, the pore water collected from each layer is independent and not disordered, meanwhile, in the whole collection process, the pore water is positioned in the negative pressure bin 235 and cannot be interfered by the external environment, and the reality and the accuracy of original data can be maintained after the pore water reaches a shore-based laboratory, so that the reality and the reliability of the data are ensured. Meanwhile, the trigger mechanism 24 adopts independent modularization, the triggering and recording are simple and convenient, the operation is simple and convenient, the components do not relate to hardware and/or the assembly of each hardware, the whole device has low manufacturing cost, and the device can be popularized and applied in a larger scale.

The invention also provides a collecting method based on the in-situ layered collecting device for the pore water of the submarine sediments, which comprises the following steps:

step 1: the entire apparatus is fixedly mounted on the ROV, for example, on a working platform of the ROV, through the coupling hole 4 of the base 3, and then lowered to the target seabed area by remotely controlling the ROV until the apparatus contacts the seabed of the target seabed area.

Step 2: the manipulator on the remote-control ROV is connected with the first connecting piece 11 through grabbing or other modes, then the sediment sampling mechanism 1 is lifted, the sampling cylinder 13 of the sediment sampling mechanism 1 is taken out, the sampling cylinder 13 is inserted into the sediment on the seabed, the sediment enters the sampling cylinder 13, sediment samples are obtained, and then the sampling cylinder 13 is pulled out from the seabed. Simultaneously, the sediment sample in the sampling tube 13 is drawn out together with the sampling tube 13.

And step 3: the sampling tube 13 carrying the sediment sample is inserted into the tube 25 of the pore water sampling mechanism 2 again, wherein the strip-shaped projection 15 on the outer side wall of the sampling tube 13 is embedded into the groove arranged on one inner side wall of the tube 25 to play a positioning role, at this time, the sampling hole 14 on the sampling tube 13 is just right opposite to the through hole on the tube 25, so that the sampling needle tube 22 is right opposite to the sampling hole 14, and the sampling needle tube 22 can pass through the through hole and the sampling hole 14 after moving forwards and then extend into the sediment sample in the sampling tube 13.

And 4, step 4: the trigger mechanism 24 is pressed by an ROV manipulator, a pressure head 242 on the trigger mechanism 24 is in contact with a contact 236, so that the sampling needle tube 22 is pushed to move towards the sampling cylinder 13, the sampling needle tube 22 is inserted into a sediment sample, and then pore water is extracted from the sediment sample, and the pore water finally flows into the negative pressure bin 235 after passing through the first one-way valve, the sampling bin 231, the second one-way valve and the fluid hose 233 and passing through the semipermeable membrane 234 until hydrogel particles in the negative pressure bin 235 are saturated and stop absorbing water, so that pore water extraction is completed.

And 5: the robot maintains the current depressed state so that the trigger mechanism 24 maintains the current position at the downward limit position, at which time the beveled edge of the ram 242 makes full contact with the arcuate structure of the contact 236 to prevent lateral movement of the sampling assembly, neither moving downward nor upward, then the entire device is salvaged ashore by the ROV and the robot is withdrawn, the trigger mechanism 24 moves upward, the sampling needle 22 resets (i.e., returns to the initial position) under the action of the spring 21, completing the sampling.

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 of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 (8)

1. An in-situ layered acquisition device for submarine sediment pore water 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 mounted 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 body of the pore water sampling mechanism to obtain a sediment sample, 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 layered acquisition is finished,

the sediment sampling mechanism comprises a first connecting piece, an end cover, a sampling cylinder, sampling holes and strip-shaped convex blocks, wherein the first connecting piece is fixed on the end cover, the end cover is fixedly connected with one end of the sampling cylinder, which is far away from the base, the other end of the sampling cylinder is of an open structure, a plurality of sampling holes are dug on one side of the sampling cylinder along the axial direction, the strip-shaped convex blocks are fixedly connected with the other side of the sampling cylinder along the axial direction, and the strip-shaped convex blocks are used for being connected with the pore water sampling mechanism, so that the sediment sampling mechanism can be detachably arranged on the pore water sampling mechanism,

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 at 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 a base, so that the pore water sampling mechanism is fixed 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 just opposite to a sampling hole of the sediment sampling mechanism, the collector is movably arranged in the containing bin along the transverse direction of the containing bin so that the collector can be taken out of the containing bin, the trigger mechanism is movably arranged on the inner side wall of the containing bin along the longitudinal direction of the containing bin so that the trigger mechanism can move along the longitudinal direction of the containing bin in the containing 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.

2. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 1, 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 arranged at the upper end of the cylinder body.

3. The device for in-situ layered collection of pore water of seafloor sediments as claimed in claim 2, 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.

4. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 3, wherein the outer walls of the two sides of the housing are fixedly connected with a guide rail bump respectively, the guide rail bumps are welded with the housing or are of an integral structure, the guide rail bumps are arranged along the axial direction of the housing, the two inner side walls of the containing bin are fixedly connected with guide rail grooves respectively matched with the guide rail bumps, and the guide rail bumps are movably mounted on the guide rail grooves and can slide along the guide rail grooves.

5. The device for in-situ layered collection of pore water of seafloor sediments as claimed in claim 4, 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.

6. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 5, 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 of 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.

7. The in-situ layered collection device for pore water of seafloor sediments as claimed in claim 6, wherein the containing bin comprises at least two 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.

8. 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 seabed sediment pore water in-situ layered collection device according to claim 7 on an ROV through a coupling hole of a base, and then lowering the whole device to a target seabed area by remotely controlling the ROV until the device contacts the seabed of the target seabed area;

and 2, step: 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 3, 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 by an 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 a negative pressure bin after passing through a first one-way valve, a sampling bin, a second one-way valve, a fluid hose and a semipermeable membrane until hydrogel particles in the negative pressure bin are saturated and stop absorbing water, 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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