CN211877419U - Small-size portable coastal waters deposit sampling device - Google Patents

Abstract

The utility model discloses a small-size portable coastal waters deposit sampling device, including upper portion connecting device, inside sampling cylinder, external seal sleeve and spring seal board. The advantages are that: the device utilizes pure mechanical principle, and for current bulky deposit sampling device, small, the flexibility is high, to personnel and large-scale hoisting equipment's dependence low, easy operation. Compared with the existing small sediment sampler, such as the most common grab bucket sampler, the device has a regular shape, is convenient to carry and store, and can store the obtained sample in a sealed manner, so that the integrity and the in-situ performance of the sample are better maintained. The device has the characteristics of small volume, light weight, simple operation, portability and the like, not only provides great convenience for the offshore sediment multi-point sampling operation task of the manned ship, but also solves the problem that the unmanned ship lacks a proper device for sediment sampling operation.

Description

Small-size portable coastal waters deposit sampling device

Technical Field

The utility model relates to a small-size portable coastal waters deposit sampling device belongs to marine environment monitoring technology field.

Background

Marine substrate sediments are a generic term for the formation of seafloor sediments by various marine sedimentations. Traditionally, sediments are classified by depth into: near shore deposition (0-20 m), shallow sea deposition (20-200 m), semi-deep sea deposition (200-2000 m) and deep sea deposition (greater than 2000 m). Wherein the near shore shallow sea deposition is mainly mechanical debris distributed in beaches and tidal zones, namely, sand, gravel and biological bones with different particle sizes, debris of shells and the like. The whole shallow sea tangle occupies only 25% of the ocean area, but the sediments in this sea area occupy 90% of the total sediments in the ocean. Therefore, the research on the marine sediments has extremely important significance for the monitoring of marine environment and the research on marine subjects such as marine geology, marine biology, ancient climatology and the like.

The existing sediment sampling operation mode is mainly to carry a large-volume multi-tube sediment sampling device through a marine scientific investigation ship to carry out sampling operation, and the sediment sampling device has the advantages that a plurality of samples of the same sampling point can be simultaneously taken, but the sediment sampling device has the defects that the sampling operation is not flexible enough, the carried sediment sampler is heavy in weight, required personnel and supporting facilities are extremely complex, the sampling operation is high in cost, and the safety and the reliability are poor. And the large scientific investigation ship is inconvenient to sample sediments in near shallow sea, and the high operation cost is a waste of resource allocation. When the sampling operation of the near-shallow sea is carried out, the used ship is often small in displacement, and the carrying capacity of hoisting equipment and personnel is limited. Meanwhile, the offshore sediment sampling operation also needs flexible selection of sampling points, so that the large-scale multi-tube sediment sampling device is not suitable for offshore multipoint sediment sampling operation.

The common small-sized sediment sampler such as a grab bucket sampler is irregular in shape, is inconvenient to carry when carrying out multipoint sampling operation of near-shore sediment, and is inconvenient to replace when switching a sampling device among different sampling points. Simultaneously, grab small-size sampling device such as bucket type is when sampling, and it is great to sample integrality's destruction, and the whole device leakproofness after accomplishing the sampling is poor, promotes the transportation in-process because the exogenic action such as vibration makes the normal position nature greatly reduced of sample, and these factors can produce great interference to subsequent sample analysis process.

Disclosure of Invention

The utility model aims to solve the technical problem that overcome prior art's defect, provide a small-size portable coastal waters deposit sampling device.

In order to solve the technical problem, the utility model provides a small portable offshore sediment sampling device, which comprises an upper connecting device, an internal sampling cylinder, an external sealing sleeve and a spring sealing plate;

the upper connecting device comprises a metal base, an upper hoisting connecting block and a plurality of pressure sealing covers; the upper lifting connecting block is connected with the lifting device, a plurality of metal movable blocks capable of moving up and down are arranged on the periphery of the metal base at equal intervals, the pressure sealing cover is arranged at the lower end of each metal movable block, and the metal movable blocks are inclined upwards in a natural state;

the inner sampling cylinder is a hollow cylinder with a round table-shaped lower part; the middle part of the top surface of the hollow cylinder is connected with the lower end of the metal base, the top surface is provided with a plurality of openings corresponding to the positions of the pressure sealing covers, the openings are matched with the pressure sealing covers in shape, and when the plane of the pressure sealing covers is parallel to the horizontal plane, the pressure sealing covers just seal the openings; a plurality of guide grooves are formed in the outer circumference of the hollow cylinder at equal intervals from top to bottom;

the external sealing sleeve comprises a metal sleeve and a plurality of sealing metal rods; the sealing metal rods are arranged at equal intervals along the inner circumference of the metal sleeve, the position of each sealing metal rod corresponds to the position of the guide groove, and the metal sleeve can freely slide up and down along the guide groove through the sealing metal rods; the top end of the sealing metal rod is provided with a plane pressing block for pressing the pressure sealing cover;

a sliding groove for inserting the spring sealing plate is formed in the metal sleeve; the spring sealing plate is used for sealing the bottom surface of the hollow cylinder.

Further, the metal base includes integrated into one piece's upper portion metal cylinder and lower part metal cylinder, lower part metal cylinder is equipped with the external screw thread, the middle part of the top surface of well cavity section of thick bamboo be equipped with external screw thread assorted internal thread.

Furthermore, the pressure sealing cover is made of rubber and is fixed at the lower end of the metal movable block through a bolt.

Further, upper portion metal cylinder a week is equidistant to be equipped with a plurality of spread grooves, be equipped with torsional spring (105) and metal axle (106) in the spread groove, on the lateral wall of spread groove was fixed in at metal axle (106) both ends, the rotatable cup joint of one end of metal movable block (104) was on metal axle (106), and torsional spring (105) one end is connected with the metal movable block side, and the other end is connected with the lateral wall of spread groove, torsional spring (105) are rotating spring, and rotating spring's initial position is according to the required inclination setting of metal movable block (104) and horizontal plane.

Further, the pressure sealing cover is a circular truncated cone-shaped rubber sealing cover.

Further, the hollow cylinder comprises an upper POM material hollow cylinder and a lower stainless steel circular truncated cone which are connected into a whole through a bolt.

Furthermore, two sides of the spring sealing plate are provided with installation guide grooves for installing springs, one end of each spring (406) is fixed on the spring sealing plate, the other end of each spring is fixed on a spring fixing block, the spring fixing blocks are fixed in installation grooves formed in the metal sleeve, and the installation grooves are formed in the metal sleeve (302) on the opposite side of the insertion side of the spring sealing plate; the sliding grooves are provided with an upper sliding groove and a lower sliding groove which correspond to the two spring sealing plates, the inserting directions of the two spring sealing plates are opposite, and the springs are always in a stretching state.

Furthermore, a plurality of through holes for water to pass through are formed in the outer side of the upper surface of the spring sealing plate, and the through holes are shielded by the metal part on the bottom surface or the top surface of the metal sleeve after the spring sealing plate is inserted into the metal sleeve.

Furthermore, the upper surface welding of metal sleeve has a plurality of rings that supply the plasticity rubber rope to pass, follows metal base side a week is equidistant to be provided with a plurality of metal couples that are used for hanging the plasticity rubber rope.

Furthermore, the middle upper parts of the plurality of sealing metal rods are connected with limiting rings used for ensuring the sealing metal rods (301) to move in the guide grooves.

The utility model discloses the beneficial effect who reaches:

1) the seawater has conductivity and corrosivity to metal, and the sampling device used in the sediment sampling operation is a pure mechanical principle device, so that the use of electrical elements is reduced, and the overall reliability is improved;

2) the device can reduce the dependence on mechanical equipment and personnel, greatly improve the efficiency of sampling operation, reduce the cost of the sampling operation, easily realize the replacement of the sampling device to carry out sampling operation tasks in different places, and make up for the vacancy of the industry;

3) the shape of the device is regular, and a plurality of samplers are convenient to carry and store when multi-point sampling operation is carried out;

4) when the device is operated, the integrity and the in-situ performance of a sample can be kept to the maximum degree by the operation mode of gravity insertion and the good sealing performance of the cylindrical sampling container;

5) the device utilizes the telescopic gravity of external seal through ingenious design, makes the telescopic gravity of external seal insert the soil layer through pure mechanical principle in sampling process help, retrieves the sealed sampling section of thick bamboo of sampling device in-process help.

6) The device has the characteristics of small volume, light weight, simplicity in operation, convenience in carrying and storage, is matched with the working conditions of small load, high space utilization rate and unmanned operation of the unmanned ship, and is suitable for being applied to sediment sampling operation tasks of unmanned platforms such as the unmanned ship.

Drawings

FIG. 1 is a front view of an upper metal connection device;

FIG. 2 is a top view of the upper metal connection device;

FIG. 3 is a front view of an inner sampling cartridge;

FIG. 4 is a top view of the inner sampling cartridge;

FIG. 5 is an isometric view of the upper metal connector assembly mated with the inner sampling cartridge;

FIG. 6 is a front view of the outer sealing sleeve;

FIG. 7 is a top view of the outer sealing sleeve;

FIG. 8 is an isometric view of the outer seal sleeve;

FIG. 9 is a top view of a spring seal plate;

FIG. 10 is a schematic view of the engagement of the spring sealing plate and the spring fixing block in the lower metal sleeve when the bottom is sealed;

FIG. 11 is a schematic view of the engagement of a spring seal plate with a cartridge in a lower metal sleeve with the bottom seal;

FIG. 12 is an isometric view of the sampling device prior to sampling operations;

FIG. 13 is an isometric view of the sampling device after a sampling operation;

FIGS. 14-17 are cross-sectional views of the device during various stages of a sampling operation performed by the entire device;

FIG. 14 is a schematic diagram of the sampling device in a non-bottoming state during sampling operation;

FIG. 15 is a schematic view of the sampling device in a sampling operation, after bottoming, with the outer metal sleeve seated;

FIG. 16 is a schematic view showing the plastic rubber rope unhooking process after the outer metal sleeve is bottomed during the sampling operation of the sampling device;

fig. 17 is a schematic diagram of the recovery process after the sampling operation of the sampling device is completed.

In the figure, 101 is a metal base, 102 is an upper hanging connecting block, 103 is a pressure seal cover, 104 is a metal movable block, 105 is a torsion spring, 106 is a metal shaft, 107 is a metal hook, 108 is a bolt, 109 is an external thread, 201 is an upper POM material hollow cylinder, 202 is an opening, 203 is a lower stainless steel circular truncated cone-shaped cylinder, 204 is an internal thread, 205 is a bolt mounting hole, 206 is a guide groove, 301 is a seal metal rod, 302 is a metal sleeve, 303 is a flat press block, 304 is a sliding groove, 305 is a mounting groove, 306 is a ring, 307 is a plastic rubber rope, 401 is an upper spring sealing plate, 402 is a lower spring sealing plate, 403 is a mounting guide groove, 404 is a spring fixing block, 405 is a through hole, 406 is a spring, 407 is a spring fixing point, and 408 is an arc-shaped front end.

Detailed Description

The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1-12, the present invention provides a small portable sediment sampling device comprising an upper connection device, an inner sampling cartridge, an outer sealing sleeve and a spring sealing plate.

The upper connecting device comprises a metal base 101, an upper hanging connecting block 102 and three pressure sealing covers 103. The metal base 101 is a block body formed by connecting cylinders with different diameters in the upper and lower directions, and the upper hoisting connecting block 102 is a metal cylinder block body used for connecting the sampling device with a hoisting winch. The lower part of the metal base 101 is connected with the sampling cylinder through external threads 109, and the metal base and the sampling cylinder are integrated after being connected. The three pressure seal covers 103 are made of rubber and fixed on the metal movable block 104 by bolts 108, and the metal movable block 104 is further mounted on the periphery of the metal base 101 at equal intervals by the torsion spring 105 and the metal shaft 106. The metal movable block 104 is lifted up at an angle of 30 ° to the horizontal plane in a natural state by the action of the torsion spring 105, and can rotate around the metal shaft 106 by the action of an external force. When the plane of the sealing cover is parallel to the horizontal plane, the circular rubber sealing cover is concentric with the upper part of the sampling cylinder in the shape of a truncated cone, and the upper part of the circular rubber sealing cover is just sealed in the shape of the truncated cone. In addition, three metal hooks 107 are provided along the side of the metal base 101 at equal intervals for hanging the plastic rubber string on the external sealing sleeve.

In this embodiment, the equal interval of upper portion metal cylinder a week is equipped with a plurality of spread grooves, be equipped with torsional spring 105 and metal axle 106 in the spread groove, on the lateral wall of spread groove was fixed in at metal axle 106 both ends, the rotatable cup joint of one end of metal movable block was on metal axle 106, and piece torsional spring 105 one end is connected with the metal movable block side, and the other end is connected with the lateral wall of spread groove, torsional spring 105 is rotating spring, all is equipped with the torsional spring fixed slot on the lateral wall of spread groove and the metal movable block 104 for connect one end of torsional spring respectively, the initial position of rotating spring is controlled through the initial position of adjustment spring fixed slot, realizes that the metal movable block is personally submitted 30 angles with the level and lifts up under the.

The internal sampling cylinder of the underwater sampling device comprises an upper POM material hollow cylinder 201 and a lower stainless steel cone-shaped cylinder 203 which are connected through bolts at bolt mounting holes 205. The center of the upper POM material hollow cylinder 201 is provided with an internal thread 204 connected with the metal base 101. Meanwhile, the top surface of the upper POM material hollow cylinder 201 is provided with three truncated cone-shaped openings 202, so that water flow can smoothly pass through the cylinder when the cylinder sinks, and water flow resistance is reduced. After sampling is finished, the opening is sealed by matching with an external mechanical sealing sleeve, and the pressure maintaining effect is achieved. The stainless steel nozzle at the lower part of the cylinder is designed into a round table shape, as shown in figure 3, so as to reduce the resistance when the whole cylinder is inserted into the seabed sediment. The outer circumference of the whole inner sampling cylinder is equidistantly provided with three cylindrical guide grooves 206 for sliding metal rods, and the three cylindrical guide grooves are used for being matched with the sealing metal rods 301 on the outer metal sealing sleeve to enable the inner part and the outer part to freely slide.

The external sealing sleeve comprises three sealing metal rods 301 and a metal sleeve 302 at the bottom, and protruding plane pressing blocks 303 are arranged at the upper ends of the three metal rods. The metal sleeve 302 is an internally grooved annular cylindrical block, the inner diameter of the ring of which is adapted to pass through a sampling cartridge, and which is adapted to be nested on the internal sampling cartridge in use, with relative sliding movement between the two. Meanwhile, a sliding groove 304 for inserting the two spring sealing plates relatively is formed in the metal sleeve 302, and an installation groove 305 for inserting the spring fixing block is formed in the opposite direction. As shown in fig. 6-8, the two spring sealing plates are inserted oppositely to form a complete cylinder with the whole metal sleeve, and the two sealing plates are inserted in a vertically staggered manner for sealing the lower end of the sampling cylinder after sampling. The upper surface welding of metal sleeve 302 has three rings 306 that supply plastic rubber rope 307 to pass, and plastic rubber rope passes ring 306, and plastic rubber rope 307 hangs on the metal couple 107 of upper portion metal base when transferring the sample thief, and the outside seal sleeve receives the restraint of rubber rope can not move down for inside sampling tube. The middle upper parts of the 3 sealing metal rods are connected with limiting rings used for ensuring the sealing metal rods (301) to move in the guide grooves.

The spring sealing plate is an irregular flat plate, guide grooves 403 for mounting long springs are arranged on two sides of the flat plate, one end of each long spring is fixed at a spring fixing point 407 (the front end of the guide groove 403) of the sealing plate, the other end of each long spring is connected to a spring fixing block 404, the spring fixing block 404 and the spring sealing plate are inserted into the metal sleeve 302 from opposite directions, and the spring fixing block 404 and the spring sealing plate are stressed by springs and tend to tighten inwards. Meanwhile, as the metal sleeve 302 is internally provided with the sliding groove 304 for the two spring sealing plates to slide, when the two sealing plates are pulled out, the two spring sealing plates tend to be inwardly recovered under the action of the pulling force of the springs at the two sides. The upper surfaces of the two sealing plates are provided with through holes 405 for water to pass through so as to reduce the water flow resistance when the sampling device is lowered. Before sampling, the sampling tube is pulled out manually, and the arc-shaped front end 408 of the sampling tube is matched with the wall surface of the sampling tube. And after sampling is finished, the two sealing covers are collected into the lower end of the mechanical sealing sleeve under the action of the spring, so that the lower end of the whole sealing sleeve forms a complete cylinder.

The specific working mode of the system is as follows:

1. before sampling operation is carried out: after the upper connecting device is connected with the sampling cylinder, the three rubber sealing covers are located right above the circular truncated cone-shaped hole in the upper portion of the sampling cylinder, are lifted up by an angle of 30 degrees and are just located below the upper plane pressing block in the external sealing sleeve. Because the outer sealing sleeve and the inner sampling cylinder of the rubber sealing cover can freely slide relatively, when the sampling device is lifted, the outer sealing sleeve should slide downwards relative to the inner sampling cylinder, but the outer sealing sleeve and the inner sampling cylinder are kept relatively still under the connection constraint action of the plastic rubber rope around the outer sealing sleeve. The weight of the outer sealing sleeve, which now is fully applied to the metal base, will assist the insertion of the entire sampling device into the deposit. Two spring seal boards installed on two sides of the seal sleeve are manually pulled out and are under the action of the tension of the spring, the arc front end of each spring seal board is vertically sheared on the cylindrical wall surface of the sampling cylinder, and the two spring seal boards protrude out of the whole cylindrical sampling device and are in a two-arm opening shape. Because the surfaces of the two spring sealing plates and the upper end of the sampling cylinder are provided with the through holes, the whole sampling device cannot be subjected to too large water flow resistance in the lowering process. The sampling device remains in this state until the entire sampling device bottoms out. This state is as shown in FIG. 12

2. In the sampling operation process: when the sampling device is slowly lowered to a certain height away from the seabed, the lifting winch is accelerated to sink the whole sampling device, the sampling device falls in an approximate free-falling state, and the sampling device impacts the bottom sediment by inertia and gravity. Until the cone-shaped tip of the sampling cylinder is firstly contacted with the bottom, the water flow passing through the opening on the upper surface of the sampling cylinder in the process can not cause too much resistance. When bottoming occurs, the weight of the outer sealing sleeve is still transferred to the metal base through the plastic rubber rope in addition to the effect of inertia to help the entire cartridge penetrate into the ground. However, as the cartridge is continually cut into the seafloor sediment, the lower surface of the outer sealing sleeve will contact the ground, at which point the weight of the outer cartridge is taken up by the ground and the plastic rubber rope loses traction. Afterwards, the sampling cylinder can still be deep downwards relative to the external sealing sleeve by means of the gravity of the sampling cylinder and the gravity of the upper metal base, the plastic rubber rope is separated from the metal hook due to small elastic deformation after a certain distance, relative restraint is lost between the inner part and the outer part at the moment, and the inner part and the outer part can move completely relatively. And after the cylindrical sampling cylinder cannot continue to sink and enough sediment samples are collected inside the cylindrical sampling cylinder, the sampling operation is finished. The process is as in fig. 14-17.

3. The recovery process of the sampling device comprises the following steps: and the cable is collected after the sampling operation is finished, and at the moment, the plastic rubber rope is not suspended on the metal lifting hook any more, so that the inner part and the outer part lose connection constraint and can freely move relatively. The inner sampling cartridge carries the sample gradually pulled from the seabed substrate. The outer sealing sleeve is not bound by the elastic rope and is kept still on the ground by means of self gravity. And the inner sampling cylinder is continuously moved upwards relative to the outer sealing sleeve against the shearing friction force of the two spring sealing plates. After the rubber sealing cover on the sampling cylinder reaches the lower part of the plane pressing block, if the lifting is continued, the plane pressing block on the external sealing sleeve stops the sealing cover, the gravity of the external sleeve is transmitted to the rubber sealing cover through the three plane pressing blocks at the moment, so that the rubber sealing cover overcomes the action force of the torsion spring and rotates for 30 degrees around the installation shaft until the circular table type rubber sealing cover rotates to be parallel to the horizontal plane and completes the circular table shape sealing of the opening on the upper surface of the sampling cylinder. When accomplishing the sampling cylinder upper surface sealed just, the sampling cylinder bottom round platform shape is most advanced also to rise above the plane of spring seal board just, two spring seal boards have lost the blockking of sampling cylinder wall and receive spring tension effect crisscross the inserting metal sleeve in, the metal sleeve outward appearance after inserting is a complete cylinder, trompil on the spring seal board also receives metal sleeve's metal part to block and does not make the sample leak down, so far the lower surface of sampling cylinder is sealed by two closing plates of crisscross inserting completely, the sample in the whole sampling cylinder will keep this state ashore, the sampling operation process finishes. The process is as shown in fig. 16-17.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims (10)

1. A small portable offshore sediment sampling device is characterized by comprising an upper connecting device, an inner sampling cylinder, an outer sealing sleeve and a spring sealing plate;

the upper connecting device comprises a metal base (101), an upper hoisting connecting block (102) and a plurality of pressure sealing covers (103); the upper lifting connecting block (102) is connected with a lifting device, a plurality of metal movable blocks (104) capable of moving up and down are arranged on the periphery of the metal base at equal intervals, the pressure sealing cover (103) is arranged at the lower end of each metal movable block (104), and the metal movable blocks are inclined upwards in a natural state;

the inner sampling cylinder is a hollow cylinder with a round table-shaped lower part; the middle part of the top surface of the hollow cylinder is connected with the lower end of the metal base (101), the top surface is provided with a plurality of openings (202) corresponding to the positions of the pressure sealing covers (103), the shapes of the openings (202) are matched with those of the pressure sealing covers (103), and when the planes of the pressure sealing covers (103) are parallel to the horizontal plane, the pressure sealing covers (103) just seal the openings (202); a plurality of guide grooves (206) from top to bottom are arranged on the outer circumference of the hollow cylinder at equal intervals;

the outer sealing sleeve comprises a metal sleeve (302) and a plurality of sealing metal rods (301); a plurality of sealing metal rods are arranged at equal intervals along the inner circumference of the metal sleeve (302), the position of each sealing metal rod (301) corresponds to the position of the guide groove (206), and the metal sleeve (302) can freely slide up and down along the guide groove (206) through the sealing metal rods (301); the top end of the sealing metal rod (301) is provided with a plane pressing block (303) for pressing the pressure sealing cover (103);

a sliding groove (304) for inserting a spring sealing plate is formed in the metal sleeve (302); the spring sealing plate is used for sealing the bottom surface of the hollow cylinder.

2. A compact portable offshore sediment sampling device according to claim 1, wherein the metal base comprises an integrally formed upper metal cylinder and a lower metal cylinder, the lower metal cylinder being provided with an external thread, and a middle portion of the top surface of the hollow cylinder being provided with an internal thread matching the external thread.

3. A small portable offshore sediment sampling device according to claim 1, wherein the pressure tight lid (103) is made of rubber and is fixed to the lower end of the metal movable block (104) by bolts.

4. A small portable offshore sediment sampling device according to claim 2, wherein the upper metal cylinder is provided with a plurality of connecting grooves at equal intervals around the circumference, a torsion spring (105) and a metal shaft (106) are arranged in the connecting grooves, two ends of the metal shaft (106) are fixed on the outer side walls of the connecting grooves, one end of the metal movable block (104) is rotatably sleeved on the metal shaft (106), one end of the torsion spring (105) is connected with the side surface of the metal movable block, the other end of the torsion spring is connected with the side wall of the connecting grooves, the torsion spring (105) is a rotating spring, and the initial position of the rotating spring is set according to the required inclination angle of the metal movable block (104) and the horizontal.

5. The small portable offshore sediment sampling device of claim 1, wherein the pressure tight cap (103) is a frustoconical rubber seal cap.

6. The small portable offshore sediment sampling device of claim 1, wherein the hollow cylinder comprises an upper POM material hollow cylinder (201) and a lower stainless steel frustoconical cylinder (203) that are bolted together.

7. The small portable offshore sediment sampling device of claim 1, wherein the spring sealing plate is provided with mounting channels (403) on both sides thereof for mounting springs (406), the springs (406) being fixed at one end to the spring sealing plate and at the other end to a spring fixing block (404), the spring fixing block (404) being fixed in a mounting groove (305) provided in the metal sleeve (302), the mounting groove (305) being provided in the metal sleeve (302) on the opposite side of the insertion side of the spring sealing plate; the sliding groove (304) is provided with an upper sliding groove and a lower sliding groove, the upper sliding groove and the lower sliding groove correspond to the two spring sealing plates, the inserting directions of the two spring sealing plates are opposite, and the spring (406) is always in a stretching state.

8. A compact portable offshore sediment sampling device according to claim 1, wherein the spring sealing plate is provided with a plurality of through holes (405) on the outer side of its upper surface for water flow, and wherein the through holes (405) are shielded by the metal part of the bottom or top surface of the metal sleeve (302) after the spring sealing plate is inserted into the metal sleeve (302).

9. A small portable offshore sediment sampling device according to claim 1, wherein the metal sleeve (302) has a number of rings welded to its upper surface for plastic rubber strings (307) to pass through, and a number of metal hooks for hanging the plastic rubber strings (307) are arranged at equal intervals around the side of the metal base.

10. A small portable offshore sediment sampling device according to claim 1, wherein a stop collar is attached to the upper middle part of the number of sealing metal rods (301).

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