Underwater rock soil sampling device

Abstract

The invention discloses an underwater rock-soil sampling device, belongs to the technical field of rock-soil sampling, and aims to solve the problems that the position of the sampling device deviates due to large impact force of water flow and a sample needing to be detected is difficult to flexibly select during sampling in a deepwater area, the underwater rock-soil sampling device comprises a mounting frame, and a hanging bracket is fixed on the top surface of the mounting frame; an inner cylinder is fixedly connected to the mounting frame, a double-shaft motor is fixed in the inner cylinder, a first rotating shaft and a second rotating shaft are fixedly connected to the output ends of the two ends of the double-shaft motor respectively, blades are fixedly connected to the top surface of the first rotating shaft, an outer cylinder is fixedly connected to the first rotating shaft in a sleeving mode, and a separation cylinder is fixedly connected to the bottom surface of the second rotating shaft; according to the device, the impact force of water flow can be effectively counteracted, the position deviation caused by the impact force of the water flow can be reduced, and the extracted rock soil can be subjected to efficient solid-liquid separation, so that a worker can flexibly select a rock soil sample to be detected according to actual requirements.

Description

Technical Field

[0001] The invention relates to the technical field of rock and soil sampling, in particular to an underwater rock and soil sampling device. Background Art

[0002] Foundation geotechnical engineering investigation refers to the activities of identifying, analyzing, and evaluating the geological, environmental characteristics and geotechnical conditions of the construction site and compiling investigation documents according to the requirements of the construction project. The structure and properties of rock and soil have an important influence on the bearing capacity, so the sampling and analysis of rock and soil is an indispensable and important work link before construction. The test soil is extracted by the rock and soil sampling device as a sample to understand the properties of the base layer. Its working environment is diverse.

[0003] At present, most of the underwater sampling devices on the market use a winch to retract the rope to lower it into the water, and the sampling operation is completed by a piston. However, when rock and soil sampling is carried out in deep waters, the strong impact of the water flow will cause the sampling device to shift in position, causing the collected rock and soil samples to deviate from the predetermined sampling area, reducing the accuracy and effectiveness of the sampling. In addition, there are many aquatic plants such as seaweed and water grass underwater. During the sampling process, these plants are easily entangled in the sampling device, which will not only hinder the normal operation of the sampling device, but also further reduce the efficiency and quality of the sampling. In addition, the extracted rock and soil samples contain a lot of water, making it difficult for staff to flexibly and accurately select suitable rock and soil samples based on actual testing needs, which brings many inconveniences to subsequent testing and analysis work.

[0004] In view of the above problems, an underwater rock and soil sampling device is proposed. Summary of the invention

[0005] The object of the present invention is to provide an underwater rock and soil sampling device. By adopting this device to work, the problems that when the sampling device in the above background is sampling in deep water, the position of the sampling device is deviated due to the strong impact force of the water flow, the sampled rock and soil are often not within the predetermined range, the underwater seaweed and water plants are easy to entangle the sampling device and affect the sampling effect, and the extracted rock and soil samples contain a lot of water, making it difficult for the staff to flexibly select the required test samples.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an underwater rock and soil sampling device, comprising a mounting frame, a hanger is fixed on the top surface of the mounting frame, an inner cylinder is fixedly connected to the mounting frame, a double-axis motor is fixed inside the inner cylinder, two output ends of the double-axis motor are respectively fixedly connected to a first rotating shaft and a second rotating shaft, a blade is fixedly connected to the top surface of the first rotating shaft, an outer cylinder is fixedly sleeved on the first rotating shaft, a separation cylinder is fixedly connected to the bottom surface of the second rotating shaft, and a sampling cylinder is connected to the bottom of the separation cylinder; A water storage cylinder is fixed to the inner wall of the inner cylinder. A drain pipe is communicated with the side wall of the water storage cylinder. A sleeve rack is fixed to the inner wall of the water storage cylinder. The separation cylinder is in fitting rotation with the sleeve rack. It further includes: A plugging assembly which is convenient for plugging the separation cylinder; A vacuum assembly which is convenient for vacuum extraction of the separation cylinder.

[0007] Furthermore, an arc-shaped groove is formed in the inner top wall of the outer cylinder. The outer cylinder and the inner cylinder are rotationally connected through the arc-shaped groove.

[0008] Furthermore, a plurality of grooves are formed in the inner wall of the outer cylinder. A plurality of fixing rods are fixed in the plurality of grooves. A rotating block is rotatably connected to the plurality of fixing rods. A plurality of cutting blades are fixed to the plurality of rotating blocks. The plurality of grooves are linearly distributed. The plurality of fixing rods, rotating blocks and cutting blades are circumferentially arrayed.

[0009] Furthermore, the plugging assembly includes a plugging plate fixedly connected inside the sleeve rack and a through hole formed in the separation cylinder.

[0010] Furthermore, the through holes are linearly and circumferentially arrayed. The plugging plates are arranged in a circular pattern corresponding to the through holes. The plugging plates are in contact with the outer walls of a plurality of through holes in the vertical direction of the separation cylinder.

[0011] Furthermore, the vacuum assembly includes a fixing plate fixedly connected to the inner wall of the inner cylinder. A vacuum pump is fixed to the bottom surface of the fixing plate. A connecting pipe is communicated with the bottom of the vacuum pump. A corrugated pipe is communicated with the bottom of the connecting pipe. An electric push rod is fixed to the top surface of the corrugated pipe. An abutting block is fixedly connected to the bottom surface of the electric push rod. A plurality of through grooves are formed in the abutting block.

[0012] Furthermore, a connecting pipe is communicated with the top surface of the separation cylinder. A cross is fixed to the bottom surface of the connecting pipe. A T-shaped rod is fixed to the top surface of the cross. A spring is fixedly sleeved on the T-shaped rod. The other end of the spring is fixedly connected to a plugging block.

[0013] Furthermore, the top surface of the connecting pipe is hollow. The plugging block is slidably connected to the hollow part of the connecting pipe.

[0014] Furthermore, the abutting block and the plugging block are in the same vertical direction.

[0015] Furthermore, a first valve is installed at the connection between the separation cylinder and the sampling cylinder. A second valve is installed inside the bottom of the sampling cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When the present invention takes samples in deep water, by rotating the outer cylinder in cooperation with the high-speed rotation of the blades, the sampling device rotates at a high speed by itself, effectively offsetting the impact force of the water flow, reducing the position deviation caused by the water flow impact, significantly improving the stability of the device during deep sampling, avoiding the sampled rock and soil not being within the predetermined sampling range, and solving the problem of sampling position deviation easily caused by the water flow impact during sampling in deeper waters; under the action of centrifugal force, the rotating blocks and blades in the inner wall grooves of the outer cylinder will rotate synchronously to cut seaweeds and waterweeds underwater, preventing them from being entangled during the sampling process and reducing the sampling effect; by the mutual cooperation of the plugging component and the vacuum component, efficient solid-liquid separation of the extracted rock and soil can be carried out, enabling the staff to flexibly select the required rock and soil samples for detection according to actual needs, and improving the practicability of the sampling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is an axonometric view of the overall structure of the present invention; Figure 3 is of the present invention Figure 2 schematic diagram of the structure of some components; Figure 4 is a schematic diagram of the connection and installation structure of components such as the outer cylinder, groove, rotating block, and blade of the present invention; Figure 5 is a schematic diagram of the sleeve frame and separation cylinder structure of the present invention; Figure 6 is a schematic diagram of the connection structure of the double-shaft motor, first rotating shaft, second rotating shaft, and blade of the present invention; Figure 7 is a schematic diagram of the overall sectional structure of the present invention; Figure 8 is of the present invention Figure 7 enlarged schematic diagram at position A; Figure 9 is a schematic diagram of the vacuum component structure of the present invention.

[0018] In the figure: 1, mounting frame; 2, hanging frame; 3, inner cylinder; 4, double-shaft motor; 5, first rotating shaft; 6, outer cylinder; 601, arc-shaped groove; 61, groove; 62, fixed rod; 63, rotating block; 64, blade; 7, blade; 8, second rotating shaft; 9, separation cylinder; 901, through hole; 91, connecting pipe; 92, cross; 93, T-shaped rod; 94, spring; 95, plugging block; 10, sampling cylinder; 11, first valve; 12, second valve; 13, water storage cylinder; 131, drain pipe; 14, sleeve frame; 141, plugging plate; 15, vacuum component; 151, fixing plate; 152, vacuum pump; 153, connecting pipe; 154, corrugated pipe; 155, electric push rod; 156, abutting block; 157, through slot. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to solve the technical problem that when the device enters deeper waters for sampling, it will be impacted by the water flow, causing the sampling position required by the device to deviate, such as Figures 1 - 3 As shown, the following preferred technical solutions are provided: An underwater rock and soil sampling device includes a mounting frame 1. The mounting frame 1 serves to carry and fix other components to ensure the stability of the device during underwater operation, and has a certain strength and rigidity to withstand the impact force of the water flow during the sampling process. A hanger 2 is fixed to the top surface of the mounting frame 1 for connecting a lifting device, such as a crane or winch on a ship. The entire sampling device can be placed in the water or lifted out of the water through the hanger 2, which is convenient for the placement and recovery of the device. An inner cylinder 3 is fixedly connected to the mounting frame 1, and a dual-axis motor 4 is fixed inside the inner cylinder 3. The dual-axis motor 4 is stably installed by accommodating the inner cylinder 3. The output ends of the dual-axis motor 4 are respectively fixedly connected to a first rotating shaft 5 and a second rotating shaft 8. The top surface of the first rotating shaft 5 is fixedly connected to a blade 7. The rotation of the blade 7 can generate centrifugal force when the sampler dives underwater, and when it goes down into the water for sampling operations. , the blades 7 are in a downward rotating state, and the downward rotation of the blades 7 drives the water flow downward, which helps to rush the rock and soil to the entrance of the sampling tube 10. On the basis of the vacuum pump 152 extracting air to form a negative pressure, it further assists the rock and soil to enter the sampling tube 10, thereby improving the sampling efficiency; when the sampling work is completed and the sampling device is recovered, the blades 7 turn to rotate upward, and the upward rotation of the blades 7 changes the direction of the water flow, so that the water resistance encountered by the sampling device during the recovery process is reduced, and the load of the winch recovery is reduced. At the same time, it can also be lifted out of the water more smoothly, reducing the shaking of the device in the water, which is beneficial to protecting the sampling device and the samples therein. An outer cylinder 6 is fixedly sleeved on the first rotating shaft 5, and an arc groove 601 is opened on the inner top wall of the outer cylinder 6. The outer cylinder 6 is rotatably connected to the inner cylinder 3 through the arc groove 601, and the inner cylinder 3 supports the outer cylinder 6 when it rotates, so that the outer cylinder 6 can rotate stably with the second rotating shaft 8.

[0021] Specifically, when using this sampling device, first connect the hanging bracket 2 on the device to the winch through a suspension rope. Immediately afterwards, control the winch to retract and release the suspension rope to submerge the sampling device underwater. During the sinking process, promptly start the double-shaft motor 4. After the double-shaft motor 4 is started, the output ends at both of its ends begin to work. Among them, the first rotating shaft 5 drives the blades 7 to rotate rapidly, and the second rotating shaft 8 drives the separation cylinder 9 to rotate synchronously.

[0022] With the continuous rotation of the first rotating shaft 5, the outer cylinder 6 sleeved outside it also rotates around the inner cylinder 3 due to the force. The rotation of the outer cylinder 6 in cooperation with the high-speed rotation of the blades 7 makes the sampling device rotate at a high speed itself during the process of penetrating into the water area. This rotation effectively offsets the impact force of the water flow, greatly reduces the position deviation caused by the water flow impact, significantly improves the stability of the device during in-depth sampling, and effectively avoids the situation where the sampled rock and soil are not within the predetermined sampling range due to the position deviation.

[0023] Compared with the prior art method of directly putting the device into the water for sampling, the design of this device solves the problem that the device is prone to be impacted by the water flow and cause deviation in the sampling position when sampling in deeper waters. Through the double-shaft drive and rotation design, the stability of the device during use is further enhanced, making the sampling work more accurate and efficient.

[0024] To solve the technical problem that when the device enters deeper waters to carry out sampling work, it is easily impacted by the water flow, which in turn causes deviation in the position where the device needs to sample, as Figures 1 - 9 shown, the following preferred technical solutions are provided: A separation cylinder 9 is fixedly connected to the bottom surface of the second rotating shaft 8. The second rotating shaft 8 can drive the separation cylinder 9 to rotate. A sampling cylinder 10 is communicated with the bottom of the separation cylinder 9. The double-shaft motor 4 drives the second rotating shaft 8, thereby enabling the separation cylinder 9 to operate. The separation cylinder 9 plays a key role in solid-liquid separation in the whole device. When the geotechnical sample enters the sampling cylinder 10 communicated with the bottom of the separation cylinder 9 together with the water body, the separation cylinder 9 separates the geotechnical and the water body by its own rotation, using centrifugal force or other separation principles. A water storage cylinder 13 is fixed to the inner wall of the inner cylinder 3. When sampling the geotechnical, the water body will be mixed in and enter the inside of the sampling cylinder 10 together. With the help of the separation cylinder 9, solid-liquid separation of the sampled geotechnical can be realized, so that the staff can separate and sample the geotechnical-water mixture, the geotechnical and the water body according to needs. A drain pipe 131 is communicated with the side wall of the water storage cylinder 13. The arrangement of the drain pipe 131 enables the water body stored in the water storage cylinder 13 to be conveniently discharged from the device. The staff can collect the discharged water body for further water quality analysis or other related research. A valve is equipped in the drain pipe 131 so that the staff can control the discharge of the water body according to needs. A sleeve bracket 14 is fixed to the inner wall of the water storage cylinder 13. The separation cylinder 9 fits and rotates with the sleeve bracket 14. The sleeve bracket 14 plays a role in supporting and guiding the rotation of the separation cylinder 9, ensuring the stability of the separation cylinder 9 during the rotation process.

[0025] A plurality of grooves 61 are formed in the inner wall of the outer cylinder 6. A plurality of fixing rods 62 are fixed in the plurality of grooves 61. A rotating block 63 is rotatably connected to the plurality of fixing rods 62. A plurality of blades 64 are fixed to the plurality of rotating blocks 63. The plurality of grooves 61 are arranged in a linear distribution. The plurality of fixing rods 62, the rotating blocks 63 and the blades 64 are arranged in a circumferential array.

[0026] Specifically, the double-shaft motor 4 drives the blades 7 on the first rotating shaft 5 to rotate, thereby generating centrifugal force. Under the action of the centrifugal force, the rotating block 63 will expand outward with high-speed rotation, and the blades 64 on the rotating block 63 will also rotate accordingly, so that when the sampling device penetrates underwater for sampling, it can cut the underwater seaweeds and waterweeds, preventing them from being entangled during use and reducing the sampling effect. And when the blades 7 stop rotating, the rotating block 63 and the blades 64 will retract into the grooves 61, avoiding scratching the staff by the external blades during the recovery process.

[0027] To solve the technical problem that it is not convenient to carry out solid-liquid separation on the extracted geotechnical during the sampling process, as Figures 2 - 9 shown, the following preferred technical solutions are provided: An underwater geotechnical sampling device further includes a sealing component and a vacuum component 15. The sealing component facilitates the sealing of the separation cylinder 9. The sealing component includes a sealing plate 141 fixedly connected inside the sleeve frame 14 and a through hole 901 opened on the separation cylinder 9. When it is necessary to seal the separation cylinder 9, the separation cylinder 9 rotates to align the through hole 901 with the sealing plate 141. The sealing plate 141 can prevent the substances inside the separation cylinder 9 from leaking through the through hole 901, thereby realizing the sealing function of the separation cylinder 9, ensuring that the geotechnical materials, water bodies, etc. inside the separation cylinder 9 are in a closed state during the solid-liquid separation process or subsequent operations, and avoiding their accidental outflow from affecting sampling or causing other problems.

[0028] The vacuum component 15 facilitates the vacuum extraction of the separation cylinder 9. The vacuum component 15 includes a fixing plate 151 fixedly connected to the inner wall of the inner cylinder 3. The bottom surface of the fixing plate 151 is fixed with a vacuum pump 152, which is the core component for realizing vacuum extraction. It pumps out the air inside the separation cylinder 9 by generating negative pressure to reach a vacuum state. The bottom of the vacuum pump 152 is connected to a connecting pipe 153 for transmitting gas and delivering the suction force generated by the vacuum pump 152 to the subsequent separation cylinder 9. The bottom of the connecting pipe 153 is connected to a corrugated pipe 154. The corrugated pipe 154 has a certain flexibility and can adapt to the up and down movement of the abutting block 156 driven by the electric push rod 155 while ensuring gas transmission, so as to stably enter the connecting pipe 91 for vacuum treatment. The top surface of the corrugated pipe 154 is fixed with an electric push rod 155. The telescopic movement of the electric push rod 155 drives the abutting block 156 to move up and down, thereby controlling the contact and separation between the abutting block 156 and the sealing block 95. The bottom surface of the electric push rod 155 is fixedly connected to the abutting block 156. A plurality of through grooves 157 are opened in the abutting block 156 so that air can flow through the through grooves 157 when the abutting block 156 contacts the sealing block 95, facilitating the vacuum pump 152 to extract the air inside the separation cylinder 9.

[0029] The top surface of the separation cylinder 9 is connected to a connecting pipe 91. The bottom surface of the connecting pipe 91 is fixed with a cross 92. The top surface of the cross 92 is fixed with a T-shaped rod 93. A spring 94 is fixedly sleeved on the T-shaped rod 93. The other end of the spring 94 is fixedly connected to a sealing block 95. This setting facilitates the connection with the corrugated pipe 154, so that when the vacuum pump 152 is connected to the separation cylinder 9 to generate negative pressure, the geotechnical materials can be extracted.

[0030] The top surface of the connecting pipe 91 is hollow. The sealing block 95 is slidably connected to the hollow part of the connecting pipe 91 and can slide therein. The abutting block 156 and the sealing block 95 are in the same vertical direction, facilitating the stable entry of the corrugated pipe 154 into the connecting pipe 91 to be connected thereto, and using the vacuum pump 152 to extract the air inside the separation cylinder 9, so as to extract the geotechnical materials.

[0031] A first valve 11 is installed at the connection between the separation cylinder 9 and the sampling cylinder 10, and a second valve 12 is installed inside the bottom of the sampling cylinder 10. The first valve 11 is used to control the connection and disconnection between the separation cylinder 9 and the sampling cylinder 10. During solid-liquid separation, the first valve 11 can be closed to prevent the liquid or solid in the separation cylinder 9 from entering the sampling cylinder 10 during the separation process; after the separation is completed, the first valve 11 can be opened as needed to enable the separated rock and soil or water body to enter the sampling cylinder 10 for sampling; the second valve 12 is used to control the discharge of the sample in the sampling cylinder 10. After sampling is completed, the second valve 12 can be opened to discharge the samples such as the rock and soil water mixture, rock and soil, or water body in the sampling cylinder 10 for subsequent analysis and processing; during the sampling process or when the sample does not need to be discharged, the second valve 12 is closed to ensure the integrity and stability of the sample in the sampling cylinder 10.

[0032] Specifically, in the initial state, the plugging plate 141 closely fits the through hole 901 on the separation cylinder 9, making the inside of the separation cylinder 9 form a sealed space. When the sampling device sinks to contact the target rock and soil layer, the dual-axis motor 4 stops operating. At this time, the first valve 11 and the second valve 12 are opened, and then the electric push rod 155 is started to extend. During the extension process of the electric push rod 155, it drives the corrugated pipe 154 to move downward. The corrugated pipe 154 stretches under the tensile force. As the corrugated pipe 154 continues to move downward, the abutting block 156 at its bottom also descends until it contacts the plugging block 95. The abutting block 156 exerts pressure on the plugging block 95, causing the plugging block 95 to move downward and compress the spring 94. At the same time, the plugging block 95 gradually enters the inside of the connecting pipe 91. At this time, the vacuum pump 152 is started. The vacuum pump 152 extracts the air in the separation cylinder 9 and the sampling cylinder 10 through the through groove 157 on the abutting block 156. Under the action of negative pressure, the rock and soil are sucked into the sampling cylinder 10. As the sampling progresses, when the sampling cylinder 10 is filled with rock and soil, the rock and soil will continue to enter the separation cylinder 9 upward. When both the separation cylinder 9 and the sampling cylinder 10 are filled with rock and soil, the vacuum pump 152 is closed, and the electric push rod 155 immediately contracts, driving the abutting block 156 to move upward and separate from the plugging block 95. The plugging block 95 moves upward under the elastic force of the spring 94 to re-plug the connecting pipe 91, effectively preventing external air from entering the separation cylinder 9 and maintaining the vacuum state inside the separation cylinder 9.

[0033] At the same time, the first valve 11 and the second valve 12 are closed to seal the sampling cylinder 10 and the separation cylinder 9, and the rock-soil-water mixture in the sampling cylinder 10 is enclosed therein. After the sampling is completed, the device is lifted upward by a winch and a rope. During the rising process of the device, the dual-axis motor 4 is started, and the first rotating shaft 5 drives the blade 7 to rotate upward under the drive of the motor, and the second rotating shaft 8 drives the separation cylinder 9 to rotate along the inner wall of the sleeve 14. As the separation cylinder 9 continues to rotate, when the through hole 901 on the separation cylinder 9 is staggered with the sealing plate 141, the water in the rock-soil-water mixture is thrown out under the action of the centrifugal force generated by the high-speed rotation of the separation cylinder 9 and enters the water storage cylinder 13 for storage.

[0034] When the sampling device is completely recovered and out of the water, turn off the dual-axis motor 4. At this time, the through hole 901 on the separation cylinder 9 can be aligned with the sealing plate 141, so that two independent closed spaces are formed between the separation cylinder 9 and the water storage cylinder 13 again, so as to prevent the substances in the two from mixing again, thereby affecting the subsequent sampling operations. When the staff needs to extract samples, first open the second valve 12 to take out the rock-soil-water mixture in the sampling cylinder 10 first, and then open the first valve 11 to take out the rock and soil in the separation cylinder 9. If the water sample needs to be tested, open the valve of the drain pipe 131 to discharge the water sample in the water storage cylinder 13 for testing. In this way, the staff can flexibly select the samples to be tested according to actual needs, which greatly improves the practicality of the sampling device.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An underwater geotechnical sampling device, comprising a mounting frame (1), characterized in that: A hanging frame (2) is fixed on the top surface of the mounting frame (1). An inner cylinder (3) is fixedly connected to the mounting frame (1). A double-shaft motor (4) is fixed inside the inner cylinder (3). The two output ends of the double-shaft motor (4) are respectively fixedly connected to a first rotating shaft (5) and a second rotating shaft (8). A blade (7) is fixedly connected to the top surface of the first rotating shaft (5). An outer cylinder (6) is fixedly sleeved on the first rotating shaft (5). A separation cylinder (9) is fixedly connected to the bottom surface of the second rotating shaft (8). A sampling cylinder (10) is communicated with the bottom of the separation cylinder (9); A water storage cylinder (13) is fixed on the inner wall of the inner cylinder (3). A drain pipe (131) is communicated with the side wall of the water storage cylinder (13). A sleeve frame (14) is fixed on the inner wall of the water storage cylinder (13). The separation cylinder (9) fits and rotates with the sleeve frame (14); It further includes: A plugging assembly which is convenient for plugging the separation cylinder (9); A vacuum assembly (15) which is convenient for vacuum extraction of the separation cylinder (9).

2. The underwater geotechnical sampling device according to claim 1, wherein: An arc-shaped groove (601) is formed on the inner top wall of the outer cylinder (6). The outer cylinder (6) is rotationally connected to the inner cylinder (3) through the arc-shaped groove (601).

3. An underwater geotechnical sampling device according to claim 1, characterized in that: A plurality of grooves (61) are formed on the inner wall of the outer cylinder (6). A plurality of fixing rods (62) are fixed in the plurality of grooves (61). A rotating block (63) is rotatably connected to the plurality of fixing rods (62). A plurality of cutting blades (64) are fixed on the plurality of rotating blocks (63). The plurality of grooves (61) are arranged linearly. The plurality of fixing rods (62), rotating blocks (63) and cutting blades (64) are arranged in a circumferential array; 4. An underwater geotechnical sampling device according to claim 1, characterized in that: The plugging assembly includes a plugging plate (141) fixedly connected inside the sleeve frame (14) and a through hole (901) formed on the separation cylinder (9).

5. An underwater rock and soil sampling device according to claim 4, characterized in that: The through holes (901) are arranged in a linear circumferential array. The plugging plate (141) is arranged in a circumferential arrangement corresponding to the through holes (901). The plugging plate (141) is in contact with the outer walls of the plurality of through holes (901) in the vertical direction of the separation cylinder (9).

6. The underwater geotechnical sampling device according to claim 1, characterized in that: The vacuum assembly (15) includes a fixing plate (151) fixedly connected to the inner wall of the inner cylinder (3). A vacuum pump (152) is fixed on the bottom surface of the fixing plate (151). A connecting pipe (153) is communicated with the bottom of the vacuum pump (152). A corrugated pipe (154) is communicated with the bottom of the connecting pipe (153). An electric push rod (155) is fixed on the top surface of the corrugated pipe (154). An abutting block (156) is fixed on the bottom surface of the electric push rod (155). A plurality of through grooves (157) are formed in the abutting block (156).

7. An underwater geotechnical sampling device according to claim 6, characterized in that: A connecting pipe (91) is communicated with the top surface of the separation cylinder (9). A cross (92) is fixed on the bottom surface of the connecting pipe (91). A T-shaped rod (93) is fixed on the top surface of the cross (92). A spring (94) is fixedly sleeved on the T-shaped rod (93). The other end of the spring (94) is fixedly connected to a plugging block (95).

8. An underwater geotechnical sampling device according to claim 7, characterized in that: The top surface of the connecting pipe (91) is hollow, and the blocking block (95) is slidably connected to the hollow part of the connecting pipe (91).

9. The underwater geotechnical sampling device according to claim 8, characterized in that: The abutting block (156) and the blocking block (95) are in the same vertical direction.

10. An underwater geotechnical sampling device according to claim 1, characterized in that: A first valve (11) is installed at the connection between the separation cylinder (9) and the sampling cylinder (10), and a second valve (12) is installed inside the bottom of the sampling cylinder (10).

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