Sediment sampler capable of sampling in multiple layers

Abstract

The sediment sampler comprises a sampler body, a pressure maintaining module and a sampling module, the pressure maintaining module is installed on a base, the sampler body is placed in the pressure maintaining module, a sealing structure is arranged at the bottom of the pressure maintaining module, and the sampling module is arranged on the side face of the pressure maintaining module. A sampling hole is formed in the pressure maintaining module corresponding to the sampling module, the sampler body comprises a handle and a tank body, the handle is detachably connected with the tank body, sampling grooves are formed in the two sides of the tank body and filled with soft sealing materials, a top cover is arranged at the top of the tank body, and guide blocks are arranged on the side faces, corresponding to the sampling grooves, of the top cover; the guide blocks are matched with funnel-shaped grooves symmetrically formed in the inner wall of the pressure maintaining module, a drainage hole is formed in the top cover, and a blocking structure is arranged above the drainage hole. According to the sampler, multi-level quantitative collection can be carried out on the sampler body in a pressure environment, data analysis is facilitated, and the sediment level setting analysis capability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sediment samplers, in particular to a sediment sampler capable of multi-level sampling. Background Art

[0002] When conducting submarine geological identification and evaluation research, only by obtaining undisturbed samples of submarine sediments can direct determination of sediment grain size, structure, composition and age be carried out, so as to obtain corresponding geological conditions. When the surface sediment sample is brought back to the water surface from the seabed, with the change of water depth pressure, the layers of the sediment sample may change, which may lead to a large change in the layer analysis result of the sediment sample compared with in-situ data. Especially for sediment samples in hydrate-rich areas, the change of pressure and temperature directly causes the decomposition of hydrates and the destruction of the sediment sample layers. The sediment samplers in the prior art cannot overcome the above problems. Content of the Utility Model

[0003] In order to overcome the above problems existing in the prior art, the utility model provides a sediment sampler capable of multi-level sampling.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a sediment sampler capable of multi-level sampling, including a sampler body, a pressure-holding module, and a sampling module. The pressure-holding module is installed on a base, the sampler body is placed in the pressure-holding module, a sealing structure is arranged at the bottom of the pressure-holding module, a sampling module is arranged on the side of the pressure-holding module, a sampling hole is arranged on the pressure-holding module corresponding to the sampling module. The sampler body includes a handle and a tank body. The handle is detachably connected to the tank body. Sampling grooves are arranged on both sides of the tank body, and soft sealing materials are filled in the sampling grooves. A top cover is arranged at the top of the tank body. Guide blocks are arranged on the side of the top cover corresponding to the sampling grooves, and the guide blocks are matched with funnel-shaped grooves symmetrically arranged on the inner wall of the pressure-holding module. A drainage hole is arranged on the top cover, and a plugging structure is arranged above the drainage hole.

[0005] In the above sediment sampler capable of multi-level sampling, a connecting column is arranged at the middle position of the top cover, the handle is detachably connected to the connecting column. The plugging structure includes a second spring and a separating sheet. The second spring is sleeved on the connecting column, one end is fixed on a abutting plate located on the connecting column, and the other end is fixedly connected to the separating sheet. A sealing gasket is arranged at the bottom of the separating sheet. In the non-working state, the second spring presses the separating sheet tightly to block the drainage hole.

[0006] The above-mentioned sediment sampler capable of multi-level sampling, wherein the sampling module includes a sampling chamber and a lead-out pipeline. A plurality of groups of sampling probes are arranged in the sampling chamber. The positions of the sampling probes correspond to the sampling holes and can pass through the sampling holes. The outside of the sampling chamber corresponding to each group of sampling probes is connected to a valve group through the lead-out pipeline.

[0007] The above-mentioned sediment sampler capable of multi-level sampling, wherein the pressure-holding module includes a pressure-holding chamber and a pressure-locking module. The pressure-holding chamber is pressure-locked through a pressure-locking structure. The pressure-locking structure includes a top cover pressing block, a locking unit, a frame, and a driving unit. The driving unit is installed on the base through a mounting bracket. The telescopic rod of the driving unit is rotatably connected to the bottom of the frame. Guide grooves are arranged on both sides of the frame, and guide posts are arranged on the mounting bracket. The guide posts cooperate with the guide grooves. A top cover pressing block is arranged on the top of the frame, and the locking unit is installed on both sides of the upper part of the frame for locking the pressure-holding chamber.

[0008] The above-mentioned sediment sampler capable of multi-level sampling, wherein the locking unit includes a wedge-shaped block, a first spring, a fixing frame, a bolt, and a nut. The fixing frame is of a "several" shape structure and is fixed on the frame. The bolt passes through the fixing frame and extends into the wedge-shaped block and is fixedly connected to the wedge-shaped block. A nut is arranged on the bolt outside the fixing frame. The wedge-shaped block passes through the frame and extends into the frame. The bolt is sleeved with a first spring. One end of the first spring abuts against the fixing frame, and the other end abuts against the wedge-shaped block.

[0009] The above-mentioned sediment sampler capable of multi-level sampling, wherein the sealing structure is fixed on the corresponding base of the pressure-holding chamber through bolts. The sealing module includes a rubber block and a third spring. One end of the third spring is fixedly connected to the base, and the other end is fixedly connected to the rubber block. The rubber block cooperates with the bottom of the sampler to achieve the bottom sealing of the sampler.

[0010] The beneficial effects of the present utility model are that the present utility model can perform pressure-holding sampling on sediments, and the sampler body has multiple interfaces, and can perform multi-level quantitative collection on the sampler body in a pressurized environment, which is convenient for data analysis and helps to improve the ability of sediment layer type analysis. Description of the Drawings

[0011] The present utility model will be further described below with reference to the drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the present utility model;

[0013] Figure 2 It is a front view of the present utility model;

[0014] Figure 3 It is a schematic diagram of the sampler of the present utility model with the plugging structure removed;

[0015] Figure 4 Schematic diagram of the sampler of the present utility model;

[0016] Figure 5 Schematic diagram of the pressure-holding module and sampling module of the present utility model;

[0017] Figure 6 Schematic diagram of the locking of the pressure-locking structure of the present utility model.

[0018] In the figure: 1. Base, 2. Frame, 3. Locking unit, 4. Pressure-holding chamber, 5. Hydraulic cylinder, 6. Top cover pressing strip, 7. Fixed plate, 8. Top cover pressing block, 9. Sampling chamber, 10. Sampling probe, 11. Long side connecting plate, 12. Short side connecting plate, 13. Guide post, 14. Mounting bracket, 15. Hoisting ring, 16. Handle, 17. Lock pin, 18. Guide block, 19. Tank body, 20. Second spring, 21. Export pipeline, 22. Guide groove, 23. Drainage hole, 24. Sampling groove, 25. Connecting column, 26. Fixed frame, 27. First spring, 28. Bolt, 29. Nut, 30. Wedge-shaped clamping block, 31. Funnel-shaped groove, 32. Abutting plate. Detailed implementation manners

[0019] To enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific implementation manners.

[0020] As Figure 1-2 shown, this embodiment discloses a sediment sampler capable of multi-level sampling, which is mainly used for sampling submarine sediments. After bringing the submarine sediments back to the sea surface, multi-level pressure-holding sampling is carried out. The sediment sampler in this embodiment can be carried on a remotely operated underwater vehicle (ROV), and sampling is carried out by controlling the ROV.

[0021] The sediment sampler in this embodiment includes a sampler body, a pressure-holding module, and a sampling module. The pressure-holding module is installed on the base 1, the sampler body is placed in the pressure-holding module, a sealing structure is provided at the bottom of the pressure-holding module, a sampling module is provided on the side of the pressure-holding module, and a sampling hole is provided on the pressure-holding module corresponding to the sampling module. As Figure 3-4 shown, the sampler body includes a handle 16 and a tank body 19. The handle 16 is connected to the tank body 19 through a lock pin 17, and the handle can be disassembled by inserting and pulling out the lock pin. The structure and type of the handle can be determined according to the shape and type of the ROV manipulator, so that the ROV manipulator can hold it firmly ( Figure 3 and Figure 4 show two different structures of the handle, which are respectively adapted to different ROV manipulators).

[0022] A sampling groove 24 is provided on the side of the tank body, a top cover is provided on the top of the tank body, a guiding block 18 is provided on the side of the top cover corresponding to the sampling groove, the guiding block 18 is matched with a funnel-shaped groove 31 symmetrically arranged on the inner wall of the pressure-holding chamber, a drain hole 23 is provided on the top cover, and a plugging structure is provided above the drain hole 23. A connecting column 25 is provided at the middle position of the top cover, and the handle and the connecting column are detachably connected through a locking pin. The plugging structure includes a second spring 20 and an isolation sheet. The second spring 20 is sleeved on the connecting column, one end is fixed on a abutting plate 32 located on the connecting column 25, and the other end is fixedly connected with the isolation sheet. A sealing gasket is provided at the bottom of the isolation sheet. In the non-working state, the second spring presses the isolation sheet to block the drain hole.

[0023] When the sampler body takes sediment samples, the ROV manipulator grabs the sampler handle and vertically inserts the sampler body into the soft surface sediment. As the sediment enters the inside of the sampling tube, the pressure inside the tube increases. The pressure compresses the second spring, and the isolation sheet and the sealing gasket move upward. The seawater in the sampling tube drains out of the tube through the drain hole. When the sampler body is pulled out, the pressure inside the sampling tube decreases, and the second spring resets to drive the isolation sheet and the sealing gasket to move downward to block the drain hole, preventing the sediment inside the sampler body from falling.

[0024] When the lower section of the sampler body is placed into the pressure-holding chamber, the ROV manipulator pulls out the locking pin, and the handle can be separated from the tank body. Since the handle can be separated, the size of the pressure-holding chamber can be reduced, and the design weight of the pressure-holding chamber can be reduced. A monkey's fist knot can be connected by a rope between the pin and the handle to facilitate the ROV to quickly pull out the pin. After the sampler body is placed in the pressure-holding chamber, the funnel-shaped groove on the inner side wall of the pressure-holding chamber cooperates with the guiding block on the sampler, so that the orientation of the sampler body is automatically corrected, and the sealing structure at the bottom of the pressure-holding chamber seals the bottom of the sampler body.

[0025] As Figure 5 shown, the pressure-holding module includes a pressure-holding chamber 4 and a pressure-locking structure. The pressure-holding chamber 4 is pressure-locked through the pressure-locking structure. Two symmetrical planes are cut on both sides of the pressure-holding chamber 4. A sampling hole is provided on one of the planes, and a sampling module is installed on the side where the sampling hole is provided. The sampler body is located inside the pressure-holding chamber 4 and the pressure-holding chamber limits the sampler body. Sampling grooves are provided on both sides of the sampler body, and the sampling grooves are filled with silica gel or glass glue. One side of the sampling groove corresponds to the sampling hole on the side of the pressure-holding chamber 4. A sealing structure for sealing the sampler body is provided at the bottom of the pressure-holding chamber 4. The sampling module is installed on one side of the pressure-holding chamber with a sampling hole through a connecting plate. The connecting plate includes two types, namely a short-side connecting plate 12 and a long-side connecting plate 11, which are used to fix and support the sampling chamber. The two sides of the short-side connecting plate are in the form of grooves, which can clamp the sampling chamber to ensure the up-and-down axial connection of the sampling chamber, so that the up-and-down deviation of the probe meets the requirements. In order to increase the strength and ensure the stability, long-side connecting plates are added on both sides of the long side of the sampling chamber.

[0026] The sampling module includes a sampling chamber 9 and a lead-out pipeline 21. There are 16 sampling probes 10 with a diameter of 5 mm and a spacing of 20 mm arranged in the sampling chamber 9. The positions of the sampling probes 10 correspond to the sampling holes and can pass through the sampling holes, penetrate the silica gel or glass glue filled in the sampling groove, and puncture into the sampler by at least 25 mm. Sealing grooves are provided at both the sampling chamber 9 and the pressure-holding chamber in contact with the sampling probes. The sealing grooves are two sealing grooves in the axial and longitudinal directions for sealing the sampling probes and preventing liquid leakage in the pressure-holding chamber. The outside of the sampling chamber corresponding to each group of sampling probes is connected to a valve group through a lead-out pipeline.

[0027] The sealing structure is fixed on the corresponding base of the pressure-holding chamber through bolts. The sealing module includes a rubber block and a third spring. One end of the third spring is fixedly connected to the base, and the other end is fixedly connected to the rubber block. The rubber block cooperates with the bottom of the sampler to achieve the bottom sealing of the sampler.

[0028] The pressure-locking structure includes a top cover pressing block 8, a locking unit 3, a frame 2, and a hydraulic cylinder 5. The hydraulic cylinder 5 is installed on the base through a mounting bracket 14. A lifting ring 15 is provided on the telescopic rod of the hydraulic cylinder 5. The lifting ring 15 is connected to the bottom of the frame through bolts and can rotate relatively. Guide grooves 22 are provided on both sides of the frame 2. The guide grooves 22 are of a folded-line structure. Guide posts 13 are provided on the mounting bracket 14. The guide posts 13 cooperate with the guide grooves 22. A top cover pressing block 8 is provided on the top of the frame. A top cover pressing strip 6 is further provided above the top cover pressing block 8. The top cover pressing strip is fixed to the top cover pressing block 8 through a fixing plate 7 above the frame. The locking unit is installed on both sides of the upper part of the frame for locking the pressure-holding chamber.

[0029] Multiple reserved holes are provided on the top cover pressing block, and pressure relief valves, safety valves, accumulators, pressure gauges, etc. are installed on the reserved holes.

[0030] As Figure 6 shown, the locking unit 3 includes a wedge-shaped block 30, a first spring 27, a fixing bracket 26, a bolt 28, and a nut 29. The fixing bracket 26 is of a "C" shape. The fixing bracket 26 is fixed on the frame. The bolt 28 passes through the fixing bracket 26 and extends into the wedge-shaped block and is fixedly connected to the wedge-shaped block. A nut 29 is provided on the bolt 28 outside the fixing bracket 26. The wedge-shaped block 30 passes through the frame and extends into the frame. A first spring is sleeved on the bolt. One end of the first spring abuts against the fixing bracket, and the other end abuts against the wedge-shaped block.

[0031] After placing the sampler body into the pressure-holding chamber, the hydraulic cylinder drives the frame to move downward. The guide posts slide and are guided in the guide grooves, and the top cover pressing block slowly approaches the top of the pressure-holding chamber. The upper part of the side of the pressure-holding chamber is a wedge-shaped structure, which cooperates with the wedge-shaped block. The wedge-shaped block, bolt, and nut move backward as a whole. At this time, the first spring is in a compressed state. After passing through the wedge-shaped structure on the side of the pressure-holding chamber, the first spring resets and drives the wedge-shaped block, bolt, and nut back to the starting state, getting stuck under the wedge-shaped structure on the side of the pressure-holding chamber to achieve locking. When it is necessary to take out the sampler, turn the nut with a wrench, and the nut drives the screw to move outward. Since the other end of the screw is fixedly connected to the wedge-shaped block, the screw drives the wedge-shaped block to withdraw from under the wedge-shaped structure on the side of the pressure-holding chamber to release the lock.

[0032] The principle of pore water pressure-holding is as follows: The probe penetrates the sampling groove of the sampler and inserts into the sediment. The central hole of the probe connects the sampler chamber and the pressure-holding chamber. The pressures in the sampler chamber and the sediment are in a balanced state. During the insertion process, due to the change in the volume inside the sampler chamber, the pore water in the sediment enters the sampling chamber through the holes inside the probe.

[0033] Press the probe downward, and the volume of water discharged from the pressure-holding chamber is the same as the volume that enters the sampling chamber. Therefore, the pressure-holding balance for taking pore water is achieved. The pore water inside the sampling chamber can be pumped out through the capillary tube of the connection interface and the control valve for laboratory analysis.

[0034] In this embodiment, the downward stroke of the sampling probe is about 47 mm, and the probe can be inserted into the center of the sampler. The sampling needle and the volume of the sampling chamber can be designed according to actual needs.

[0035] The specific process of using this embodiment of the sediment sampler carried on an unmanned remotely operated vehicle (ROV) for pressure-holding multi-level sampling is as follows:

[0036] Step 1, before launching, check the device to confirm that the pressure-holding function is normal. Install the device on the unmanned remotely operated vehicle, and place the sampler body in a place where the manipulator of the unmanned remotely operated vehicle can operate.

[0037] Check whether the accumulator is normal, and close the accumulator isolation valve (the accumulator isolation valve must be closed before pressurization to avoid pressure leakage and the continuous pressure of the accumulator from hurting people).

[0038] Check the sampling system. The sampling chamber and the inside of the chamber are filled with ultrapure water, and a system pressure test is carried out to confirm that the pressure-holding function is normal.

[0039] Open the relief valve, observe the pressure gauge, and drain the pressure inside the sampler to zero.

[0040] Drain the pressure of the sampling system and install the equipment on the ROV. Connect the oil pipes of the hydraulic cylinder and the locking pin to the ROV functional valve box.

[0041] The sampler body is installed on the sampling tray of the ROV, and the manipulator can easily place the sampler body inside the pressure-holding chamber.

[0042] Open the locking pin of the pressure-holding chamber and open the end cover of the pressure-holding chamber. Then loosen the nut of the locking unit to ensure that the locking unit can be automatically locked when closed. Close the end cover pressure relief valve. Open the accumulator isolation valve (automatic balanced-pressure sampling cannot be achieved without opening the isolation valve). Place the sampler probe at the top and fix it with a safety rubber band.

[0043] Step 2: After entering the water, the manipulator of the remotely operated underwater vehicle grabs the sampler body for sediment sampling. Check the sediment at the bottom of the sampler body to avoid excessive protrusions. If not meeting the standard, another manipulator will level the bottom sediment (to prevent the sampler body from being unable to automatically align after entering the pressure-holding chamber). The manipulator places the sampler body into the pressure-holding chamber and removes the handle.

[0044] Step 3: The hydraulic cylinder drives the pressure-locking structure to close and locks it through the locking unit to achieve pressure-holding sampling. After the remotely operated underwater vehicle returns to the water surface, the sampling probe moves towards the pressure-holding chamber through the sampling slot, and the water in the sediment is pumped out through the cavity of the sampling probe and the outlet pipeline.

[0045] Step 4: Open the pressure relief valve on the top cover pressing block until the pressure gauge returns to zero. Turn the nut, which drives the bolt to move outwards, and then drives the wedge-shaped block to withdraw, unlocking the locking unit. Ensure that the sampling probe is pulled out of the sampler. When the hydraulic cylinder drives the pressure-locking structure to open and the hydraulic cylinder retracts, first lift the top cover pressing block away from the top of the pressure-holding chamber, and then swing it backward to tilt the top cover pressing block backward so that the top of the pressure-holding chamber is completely exposed. Take out the sampler body from the pressure-holding chamber and measure the physical position of the insertion point of the sampler in the sediment.

[0046] The above embodiments are only exemplary embodiments of the present utility model and are not used to limit the present utility model. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present utility model, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present utility model.

Claims

1. A sediment sampler capable of multi-level sampling, characterized in that: The sampler body comprises a sampler body, a pressure-maintaining module and a sampling module, wherein the pressure-maintaining module is installed on a base, the sampler body is placed in the pressure-maintaining module, a sealing structure is arranged at the bottom of the pressure-maintaining module, a sampling module is arranged at the side of the pressure-maintaining module, a sampling hole is arranged on the pressure-maintaining module corresponding to the sampling module, the sampler body comprises a handle and a tank body, the handle is detachably connected to the tank body, sampling grooves are arranged on both sides of the tank body, the sampling grooves are filled with soft sealing material, a top cover is arranged on the top of the tank body, a guide block is arranged on the side of the top cover corresponding to the sampling groove, the guide block cooperates with the funnel-shaped groove symmetrically arranged on the inner wall of the pressure-maintaining module, a drainage hole is arranged on the top cover, and a sealing structure is arranged above the drainage hole.

2. A sediment sampler capable of multi-level sampling according to claim 1, characterized in that: A connecting column is provided in the middle position of the top cover, and the handle is detachably connected to the connecting column. The blocking structure includes a second spring and an isolation plate. The second spring is sleeved on the connecting column, one end of the second spring is fixed to a support plate located on the connecting column, and the other end is fixedly connected to the isolation plate. A sealing gasket is provided at the bottom of the isolation plate. When not in working state, the second spring presses the isolation plate to block the drainage hole.

3. A sediment sampler capable of multi-level sampling according to claim 1, characterized in that: The sampling module includes a sampling cavity and a derivation pipeline. A plurality of sampling probes are arranged in the sampling cavity. The positions of the sampling probes correspond to the sampling holes and can pass through the sampling holes. The outer side of the sampling cavity corresponding to each group of sampling probes is connected to the valve group through the derivation pipeline.

4. A sediment sampler capable of multi-level sampling according to claim 1, characterized in that: The pressure maintaining module includes a pressure maintaining cabin and a locking module. The pressure maintaining cabin is locked by a locking structure. The locking structure includes a top cover pressure block, a locking unit, a frame, and a driving unit. The driving unit is installed on the base through a mounting frame. The telescopic rod of the driving unit is rotatably connected to the bottom of the frame. Guide grooves are provided on both sides of the frame. Guide columns are provided on the mounting frame. The guide columns cooperate with the guide grooves. A top cover pressure block is provided on the top of the frame. The locking units are installed on both sides of the upper part of the frame for locking the pressure maintaining cabin.

5. A sediment sampler capable of multi-level sampling according to claim 4, characterized in that: The locking unit includes a wedge-shaped block, a first spring, a fixing frame, a bolt, and a nut. The fixing frame is a "J"-shaped structure. The fixing frame is fixed to the frame. The bolt passes through the fixing frame and extends into the wedge-shaped block and is fixedly connected to the wedge-shaped block. A nut is provided on the bolt located on the outer side of the fixing frame. The wedge-shaped block passes through the frame and extends into the frame. The first spring is sleeved on the bolt. One end of the first spring abuts against the fixing frame, and the other end abuts against the wedge-shaped block.

6. The sediment sampler capable of multi-level sampling according to claim 1, characterized in that: The sealing structure is fixed to the base corresponding to the pressure-maintaining cabin by bolts. The sealing structure includes a rubber block and a third spring. One end of the third spring is fixedly connected to the base, and the other end is fixedly connected to the rubber block. The rubber block cooperates with the bottom of the sampler to achieve sealing of the bottom of the sampler.

Images