A bottom sediment sampling device

Abstract

This invention relates to an underwater sediment sampling device, comprising a cable assembly, a guide column, a hollow motor, a propeller, and a positioning frame. The guide column is suspended from a floating object by the cable assembly. The lower end of the guide column is sequentially equipped with a rotary drive, a clamping frame, a pushing drive, and a sampling tube. The hollow motor, propeller, and positioning frame are slidably fitted onto the guide column. The rotation of the hollow motor drives the propeller to rotate, generating thrust with the water, which pushes the positioning frame and sampling tube into the sediment in sequence. The positioning frame improves positioning stability during sampling and provides circumferential stability for the rotation of the hollow motor and propeller, as well as the rotation of the rotary drive. The hollow motor and propeller, with their sliding sleeve structure on the guide column, utilize the reaction force generated by their rotation with the water to provide downward digging force, allowing the positioning frame and sampling tube to be smoothly and stably inserted into sufficiently deep sediment.

Description

Technical Field

[0001] This invention relates to a device for sampling underwater sediments. Background Technology

[0002] Bottom sediments are deposited at the bottom of lakes, reservoirs, and river channels. These bottom sediments are products of the environment and therefore contain rich information about environmental changes, making them important carriers for studying environmental change. "The present is the key to the past." The environmental information preserved in surface (modern) bottom sediments is the foundation for interpreting past river depositional environments. Obtaining surface bottom sediments corresponding to environmental timescales allows for a more precise correlation between environmental changes and environmental products, leading to a more accurate interpretation of river depositional environments.

[0003] When sampling sediments at the bottom of the water, the sampling points should be distributed as evenly as possible to reduce error interference. Chinese invention patent CN113358420B discloses a river silt stratification sampler. Its sampling module includes a sampling cylinder, a clamping frame, a rotary drive, and a push drive. The sampling cylinder is mounted on the clamping frame and can be driven by the rotary drive to rotate and drill downwards as a whole. The push drive can push the push assembly downwards to radially push out the sliding sampling component. Then, with the rotation of the rotary drive, stratification sampling is achieved in the vertical direction. Subsequently, the sample is automatically retrieved into the sampling cylinder under the restoring force of the elastic element. However, because it needs to be installed on the lake shore or river shore and requires sampling by extending an extension arm into the lake, the length of the extension arm is very limited, making it impossible to sample in the center of the lake. If it is installed on a boat to sample the central area of ​​the lake, the boat will inevitably sway, making it impossible to ensure sampling in the vertical direction. Therefore, this solution can only collect samples from areas relatively close to the lake shore, while the central area of ​​the lake far from the shore cannot be sampled. Summary of the Invention

[0004] The purpose of this invention is to provide a bottom sediment sampling device that can perform stratified sampling in the central area of ​​a lake, away from the shore.

[0005] The technical solution of the present invention is as follows: A bottom sediment sampling device, comprising: The sampling module includes a rotary drive and a sampling cylinder; The cable assembly includes a steel wire rope for carrying loads and an electrical wire for supplying power, the upper end of which is used to secure the cable to the floating object. The guide column has its upper end connected to the lower end of the cable assembly and its lower end connected to the upper end of the rotary drive component. The guide column has a circular cross-section and a guide strip is fixed on the outer circumference of the guide column. The guide strip extends along the axial direction of the guide column and an annular push platform is provided at the lower part of the guide column. A hollow motor includes a housing and a stator fixed on the housing. A rotor is coaxially sleeved inside the stator. The motor also includes a hollow shaft connected to the rotor. The lower end of the hollow shaft extends out of the housing. The hollow shaft is coaxially sleeved outside the guide post. The top of the housing has a sliding hole that matches the shape of the guide post and guide bar. The housing slides axially and anti-rotates circumferentially with the guide post and guide bar through its sliding hole. The propeller includes a sleeve and multiple blades evenly distributed on the outer circumference of the sleeve. The sleeve is coaxially connected to the lower end of a hollow shaft. The inner diameter of the sleeve is the same as the inner diameter of the hollow shaft. The lower end of the sleeve has a thrust ring. The positioning frame includes a positioning ring and multiple positioning rods evenly distributed along the outer circumference of the positioning ring. The positioning ring is fitted onto the guide post and located between the sleeve and the annular push platform. The positioning ring is axially slidingly fitted with the guide post and guide strip and circumferentially anti-rotation fitted with the guide strip. The positioning rod is an L-shaped structure composed of a horizontal section and a vertical section. The horizontal section is connected to the positioning ring, and the lower end of the vertical section has a pointed tip. The length of the vertical section is greater than the distance from the annular push platform to the lower end of the sampling cylinder. When the hollow motor starts, it drives the propeller to rotate, providing downward thrust to the positioning frame so that the vertical section and the sampling tube are inserted into the sediment in sequence.

[0006] The beneficial effects of this technical solution are as follows: A bottom sediment sampling device can be installed on a boat or other floating object to allow it to travel to any area in the center of the lake for sampling. Then, directly above the sampling point, a cable assembly lowers the guide column, positioning frame, and all its components to the sampling point. Utilizing the overall weight of the sampling components, it falls vertically. Depending on the water level, after falling a certain distance, the vertical sections of the positioning rods of the positioning frame first contact the sediment on the lake bottom. Due to the inertia of the fall and the position frame, hollow motor, etc., the sample is further lowered. The propeller's own weight causes the lower end of its vertical section to insert into the sediment to a short depth for initial positioning. As it continues to descend, the resistance of the sediment prevents the positioning frame from inserting further, while the guide column continues to fall. This causes the positioning ring to shift upwards relative to the guide column, meaning the annular pusher moves downwards relative to the positioning ring. At this point, the hollow motor can be started. The hollow shaft of the hollow motor rotates, driving the propeller to rotate. As the propeller rotates, it pushes water upwards, thus providing downward thrust for itself. This thrust is transmitted through the sleeve and the pusher ring to the positioning ring in contact with it. The positioning ring then... The force is evenly distributed to each positioning rod, pushing them to move downwards synchronously and insert deeper into the sediment. Subsequently, as the positioning ring continues to descend, it contacts the annular pusher on the guide post again, thus pushing the positioning frame and guide post downwards synchronously under the thrust of the propeller, gradually penetrating deeper into the sediment, allowing for the collection of sediment samples from deeper depths. During this process, because the top of the hollow motor housing is only axially movable with respect to the guide post and guide bar, while maintaining a circumferential anti-rotation fit, the circumferential reaction force of the hollow motor's rotation can be transmitted through the guide bar... The force is transmitted to the guide column, which in turn transmits it to the positioning rod, which has been initially inserted into the sediment, through a positioning ring that slides axially and prevents rotation circumferentially. Subsequently, once the sampling tube reaches the set depth, the hollow motor is stopped, and the jacking drive is activated to open the collection trough of the sampling tube. Then, the rotating drive is activated to rotate the sampling tube, allowing the collection trough to collect samples from the corresponding layer. During this stage, because the positioning frame is deeply inserted into the sediment, the axial and circumferential reaction forces of both the jacking and rotating drives can be borne by the positioning frame. Furthermore, throughout the sampling process, the positioning frame ensures more stable and reliable positioning, preventing sampling point drift due to floating debris or water movement.

[0007] It is clear from the above working process that, since the entire sampling device is suspended from the floating object by steel wire rope, the sampling device is in a vertical position under its own weight, and this vertical position is almost unaffected by the swaying of the floating object on the water surface. Therefore, this sampling device can be used to sample any area in the center of the lake without being limited by the distance from the riverbank. Secondly, the positioning frame not only makes the positioning more stable during the sampling process and less prone to sampling point drift, but also provides circumferential stable support for the rotation of the hollow motor and propeller and the rotation drive component. It can also use the adhesion between the horizontal section and the sediment to cooperate with the self-weight of the hollow motor, propeller and other components to provide stable support for the jacking drive component. Most importantly, by setting up the hollow motor and propeller and adopting the structure of sliding sleeve on the guide column, the reaction force generated by the rotation with the water can be used to provide the downward digging force, so that the positioning frame and sampling tube can be smoothly and stably inserted into the sediment to a sufficient depth. Even when encountering relatively dense or sandy sediment, it can still be stably inserted to a sufficient depth.

[0008] Based on the above scheme, further improvements are made as follows: the outer end of the horizontal section of the positioning rod is hinged to the positioning ring via a horizontally set hinge shaft. The positioning ring is also equipped with a limiting component to restrict the pitch and swing angle of the horizontal section. This hinged structure design, where the positioning rod and positioning ring are connected within a limited swing angle range, allows for adaptation when encountering uneven deposits or slopes, using the pitch and swing adjustment of the positioning rod to ensure the verticality of the guide column as much as possible, without compromising the original positioning function of the positioning frame and its ability to provide reaction force bearing capacity.

[0009] Based on the above solution, further improvements are made as follows: the limiting component includes a lower baffle and an upper baffle. The lower baffle is horizontally positioned, and the upper baffle extends upwards at an angle from the end closest to the positioning ring towards the direction away from the positioning ring. The inclined position of the upper baffle ensures that the positioning rod can swing upwards at a limited angle to adapt to the slope. The horizontal position of the lower baffle prevents the positioning rod from swinging downwards and retracting, because when the positioning rod swings downwards, the tip of the vertical section will be very close to the central sampling cylinder area, which may disturb the sediment morphology at the sampling point, thus leading to sampling failure.

[0010] Based on the above solution, further improvements are made as follows: a winding and unwinding device is installed on the floating object to wind and unwind the rope assembly. The winding and unwinding device allows for electronic control of the unwinding speed.

[0011] Based on the above solution, the following improvements are made: the guide column and guide strip are machined as a single piece.

[0012] Based on the above scheme, the following improvements are made: the thickness of the top of the housing is not less than 10cm, so as to increase the mating area between the sliding hole and the guide post and guide strip.

[0013] Based on the above solution, a further improvement is made as follows: a spring-loaded cord retractor is installed on the power supply and control wires of the hollow motor. This allows excess wire from the hollow motor to be neatly stored, preventing it from drooping and coming into contact with the spiral.

[0014] Based on the above scheme, the following improvements are made: the sampling module includes a push drive component, and a wire hole is provided at the center of the guide column for the wires of the rotation drive component and the push drive component to pass through. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the structural principle of a specific embodiment of an underwater sediment sampling device according to the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A magnified view of a section at point B in the middle; Figure 4 for Figure 1 A magnified view of a section at point C; Figure 5 for Figure 1 A schematic diagram showing the status of the corresponding positioning rod when encountering a slope; In the diagram: 1-Floating object, 2-Electrical control cabinet, 3-Rewinding and unwinding device, 4-Guide column, 41-Guide strip, 42-Annular push platform, 43-Wire hole, 5-Hollow motor, 51-Housing, 511-Sliding hole, 52-Stator, 53-Rotor, 54-Hollow shaft, 55-Bearing, 6-Propeller, 61-Sleeve, 611-Push ring, 62-Blade, 7-Positioning frame, 71-Positioning ring sleeve, 72-Positioning rod, 721-Horizontal section, 722-Vertical section, 7221-Tip, 723-Hinge shaft, 724-Limiting component, 7241-Upper baffle, 7242-Lower baffle, 8-Rotation drive component, 9-Clamping frame, 10-Push drive component, 11-Sampling cylinder, 12-Rope assembly, 121-Wire, 122-Elastic retractor. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0018] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0019] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0020] A specific embodiment of the underwater sediment sampling device of the present invention: as follows Figure 1-5 As shown, the underwater sediment sampling device includes an electrical control cabinet, a winding and unwinding device, a guide column, a hollow motor, a propeller, a positioning frame, a rotary drive component, a clamping frame, a pushing drive component, a sampling cylinder, and a cable assembly. Among these, the rotary drive component 8, the clamping frame 9, the pushing drive component 10, the sliding sampling component, and the sampling cylinder 11 are existing technologies; for details, please refer to Chinese invention patent CN113358420B.

[0021] The cable assembly 12 includes a steel wire rope for load bearing and a cable for power supply. The upper end of the steel wire rope is used to fix it to the floating object 1. The steel wire rope acts as a gravity-bearing component, while the cable is in a slack state, is not under stress, and only supplies power and provides control signals.

[0022] The winding and unwinding device 3 is installed on the floating object 1, which can be a boat or other floating body, for winding and unwinding the cable assembly 12. The winding and unwinding device allows for electronic control of the unwinding speed.

[0023] The upper end of the guide post 4 is connected to the lower end of the cable assembly 12, and the lower end of the guide post 4 is connected to the upper end of the rotary drive component 8. The guide post 4 has a circular cross-section, and a guide strip 41 is fixed on the outer circumference of the guide post 4. The guide strip 41 extends along the axial direction of the guide post 4, and an annular push platform 42 is provided at the lower part of the guide post 4. The guide post 4 and the guide strip 41 are integrally machined. A wire hole 43 is provided at the center of the guide post 4 for the wires of the rotary drive component 8 and the push drive component to pass through.

[0024] The hollow motor 5 includes a housing 51 and a stator 52 fixed to the housing 51. A rotor 53 is coaxially sleeved inside the stator 52. It also includes a hollow shaft 54 ​​connected to the rotor 53. The lower end of the hollow shaft 54 ​​extends from inside the housing 51 and is coaxially sleeved outside the guide post 4. The top of the housing 51 has a sliding hole 511 that matches the shape of the guide post 4 and the guide bar 41. The housing 51 slides axially and rotates circumferentially with the guide post 4 and the guide bar 41 through its sliding hole 511. The thickness of the top of the housing 51 is not less than 10cm to increase the contact area between the sliding hole 511 and the guide post 4 and the guide bar 41. A spring-loaded retractor is provided on the power supply and control wires of the hollow motor 5. This retractor can gather the excess wires of the hollow motor 5, preventing them from drooping and contacting the auger.

[0025] The propeller 6 includes a sleeve 61 and multiple blades 62 evenly distributed on the outer circumferential surface of the sleeve 61. In this embodiment, there are three blades 62. The sleeve 61 is coaxially connected to the lower end of the hollow rotating shaft 54. The inner diameter of the sleeve 61 is the same as the inner diameter of the hollow rotating shaft 54. The lower end of the sleeve 61 has a push ring 611.

[0026] The positioning frame 7 includes a positioning ring 71 and multiple positioning rods 72 evenly distributed along the outer circumference of the positioning ring 71. In this embodiment, there are four positioning rods. The positioning ring 71 is fitted onto the guide post 4 and is located between the sleeve 61 and the annular push platform 42. The positioning ring 71 is axially slidingly engaged with the guide post 4 and the guide strip 41 and is circumferentially anti-rotating. The positioning rod 72 is an L-shaped structure composed of a horizontal section 721 and a vertical section 722. The horizontal section 721 is connected to the positioning ring 71. The lower end of the vertical section 722 has a pointed tip 7221. The length of the vertical section 722 is greater than the distance from the annular push platform 42 to the lower end of the sampling cylinder. When the hollow motor 5 starts, it drives the propeller 6 to rotate, providing a downward thrust to the positioning frame 7 so that the vertical section 722 and the sampling cylinder are inserted into the sediment in sequence.

[0027] like Figure 5As shown, the outer end of the horizontal section 721 of the positioning rod 72 is hinged to the positioning ring 71 via a horizontally arranged hinge shaft 723. The positioning ring 71 is also equipped with a limiting member 724 to restrict the pitch and swing angle of the horizontal section 721. This hinged structure between the positioning rod 72 and the positioning ring 71 within a limited swing angle range allows for adaptation when encountering uneven deposits or slopes, ensuring the verticality of the guide column 4 as much as possible, without compromising the original positioning and reaction force bearing functions of the positioning frame 7. The limiting member 724 includes a lower baffle 7242 and an upper baffle 7241. The lower baffle 7242 is horizontally arranged, and the upper baffle 7241 extends upwards at an angle from the end closest to the positioning ring 71 towards the direction away from the positioning ring 71. The inclined setting of the upper baffle 7241 ensures that the positioning rod 72 can swing upward at a limited angle to adapt to the slope, while the horizontal setting of the lower baffle 7242 prevents the positioning rod 72 from swinging downward and thus contracting. This is because when the positioning rod 72 swings downward, the tip 7221 of the vertical section 722 will be very close to the middle sampling tube area, which may disturb the sediment morphology at the sampling point and lead to sampling failure.

[0028] When in use, the underwater sediment sampling device can be mounted on a boat or other floating object so that it can travel to any area in the center of the lake for sampling. Then, directly above the sampling point, the guide column 4, positioning frame 7, and all its components connected to its lower end are lowered to the sampling point via the cable assembly 12. Utilizing the overall weight of the sampling components, it falls vertically. Depending on the water level, after falling a certain distance, the vertical sections 722 of each positioning rod 72 of the positioning frame 7 first contact the sediment at the bottom of the lake. Due to the inertia of the falling motion and the weight of the positioning frame 7, hollow motor 5, and propeller 6, the vertical sections 722... The positioning frame 7 is initially inserted into the sediment to a short depth for initial positioning. As it continues to descend, the resistance of the sediment prevents the positioning frame 7 from being inserted further, while the guide post 4 continues to fall. The positioning ring 71 experiences an upward relative displacement with respect to the guide post 4, meaning the annular pusher 42 moves downward relative to the positioning ring 71. At this point, the hollow motor 5 can be started. The hollow shaft 54 ​​of the hollow motor 5 rotates, driving the propeller 6 to rotate. The propeller 6 pushes water upward, thus providing itself with downward thrust. This thrust is transmitted through the sleeve 61 and the pusher ring 611 to the positioning ring 71 in contact with it. The positioning ring 71 distributes the force evenly. The positioning rods 72 are handed over to each other, pushing them to move downwards synchronously and insert them deeper into the sediment. Subsequently, as the positioning ring 71 continues to move downwards, it will contact the annular pusher 42 on the guide post 4 again. This, under the thrust of the propeller 6, pushes the positioning frame 7 and the guide post 4 downwards synchronously to gradually penetrate deeper into the sediment, allowing for the collection of sediment samples from deeper depths. During this process, because the top of the hollow motor 5's housing 51 is only axially movable with respect to the guide post 4 and guide bar 41, while maintaining a circumferential anti-rotation fit, the circumferential reaction force of the hollow motor 5's rotation can be transmitted through the guide... The guide bar 41 transmits the force to the guide post 4, which in turn transmits it to the positioning rod 72, which has been initially inserted into the sediment, through the positioning ring 71, which has an axial sliding fit and a circumferential anti-rotation fit. Subsequently, when the sampling tube reaches the set depth, the hollow motor 5 can be stopped, and the push drive can be started to open the collection trough of the sampling tube. Then, the rotation drive 8 is started to rotate the sampling tube, thereby allowing the collection trough to collect samples from the corresponding layer. During this stage, since the positioning frame 7 is deeply inserted into the sediment, the axial and circumferential reaction forces of both the push drive and the rotation drive 8 can be borne by the positioning frame 7. Moreover, throughout the sampling process, the positioning frame 7 makes the positioning more stable and reliable, preventing the sampling point from drifting due to floating objects or water sloshing during the sampling process.

[0029] Since the entire sampling device is suspended from the floating object by steel wire rope, the sampling device is in a vertical position under its own weight, and this vertical position is almost unaffected by the swaying of the floating object on the water surface. Therefore, the sampling device can be used to sample any area in the center of the lake without being limited by the distance from the riverbank. Secondly, the positioning frame 7 provides higher stability after positioning during the sampling process, making it less likely for the sampling point to drift. On the other hand, it can also provide circumferential stable support for the rotation of the hollow motor 5 and propeller 6 and the rotation drive component 8. It can also use the adhesion between the horizontal section 721 and the sediment to cooperate with the self-weight of components such as the hollow motor 5 and propeller 6 to provide stable support for the jacking drive component. Most importantly, by setting the hollow motor 5 and propeller 6 with a structure that slides on the guide column 4, the reaction force generated by the rotation and the water can be used to provide downward digging force, so that the positioning frame 7 and the sampling tube can be smoothly and stably inserted into the sediment to a sufficient depth. Even when encountering relatively dense or sandy sediment, it can still be stably inserted to a sufficient depth.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A bottom sediment sampling device, comprising: The sampling module includes a rotary drive and a sampling cylinder; Its characteristic is that it further includes: The cable assembly includes a steel wire rope for carrying loads and an electrical wire for supplying power, the upper end of which is used to secure the cable to the floating object. The guide column has its upper end connected to the lower end of the cable assembly and its lower end connected to the upper end of the rotary drive component. The guide column has a circular cross-section and a guide strip is fixed on the outer circumference of the guide column. The guide strip extends along the axial direction of the guide column and an annular push platform is provided at the lower part of the guide column. A hollow motor includes a housing and a stator fixed on the housing. A rotor is coaxially sleeved inside the stator. The motor also includes a hollow shaft connected to the rotor. The lower end of the hollow shaft extends out of the housing. The hollow shaft is coaxially sleeved outside the guide post. The top of the housing has a sliding hole that matches the shape of the guide post and guide bar. The housing slides axially and anti-rotates circumferentially with the guide post and guide bar through its sliding hole. The propeller includes a sleeve and multiple blades evenly distributed on the outer circumference of the sleeve. The sleeve is coaxially connected to the lower end of a hollow shaft. The inner diameter of the sleeve is the same as the inner diameter of the hollow shaft. The lower end of the sleeve has a thrust ring. The positioning frame includes a positioning ring and multiple positioning rods evenly distributed along the outer circumference of the positioning ring. The positioning ring is fitted onto the guide post and located between the sleeve and the annular push platform. The positioning ring is axially slidingly fitted with the guide post and guide strip and circumferentially anti-rotation fitted with the guide strip. The positioning rod is an L-shaped structure composed of a horizontal section and a vertical section. The horizontal section is connected to the positioning ring, and the lower end of the vertical section has a pointed tip. The length of the vertical section is greater than the distance from the annular push platform to the lower end of the sampling cylinder. When the hollow motor starts, it drives the propeller to rotate, providing downward thrust to the positioning frame so that the vertical section and the sampling cylinder are inserted into the sediment in sequence. In use, the guide column, positioning frame, and all its components connected to its lower end are lowered to the sampling point via a rope assembly. The entire weight of the sampling components allows for vertical descent. Depending on the water level, after a certain distance, the vertical sections of the positioning rods of the positioning frame first contact the sediment at the lake bottom. Due to the inertia of the descent and the weight of the positioning frame, hollow motor, and propeller, the lower ends of the vertical sections insert into the sediment for initial positioning. As descent continues, the resistance of the sediment prevents the positioning frame from further insertion, while the guide column continues to fall. The positioning ring relative to the guide column experiences an upward relative displacement, meaning the annular pusher platform relative to the positioning ring... Moving downwards, the hollow motor is activated. The hollow shaft of the motor rotates, driving the propeller to rotate. As the propeller rotates, it pushes water upwards, thus providing downward thrust. This thrust is transmitted through the sleeve and the push ring to the positioning ring sleeve in contact with it. The positioning ring sleeve evenly transmits the force to each positioning rod, pushing each positioning rod to move downwards synchronously, further inserting it deeper into the sediment. Subsequently, as the positioning ring sleeve continues to move downwards, it will contact the annular push platform on the guide column again, thus pushing the positioning frame and guide column downwards synchronously under the thrust of the propeller to gradually penetrate deeper into the sediment, allowing for the collection of sediment samples from deeper depths.

2. The underwater sediment sampling device according to claim 1, characterized in that, The outer end of the horizontal section of the positioning rod is hinged to the positioning ring via a horizontally set hinge shaft. The positioning ring is also equipped with a limiting component to limit the pitch and swing angle of the horizontal section.

3. The underwater sediment sampling device according to claim 2, characterized in that, The limiting component includes a lower baffle and an upper baffle. The lower baffle is horizontally positioned, and the upper baffle extends upward at an angle from the end closest to the positioning ring towards the end furthest from the positioning ring.

4. The underwater sediment sampling device according to claim 1, characterized in that, Includes a winding and unwinding device, which is used to be installed on a floating object to wind up and unwind the cable assembly.

5. The underwater sediment sampling device according to claim 1, characterized in that, The guide pillar and guide strip are machined as a single piece.

6. The underwater sediment sampling device according to claim 1, characterized in that, The thickness of the top of the housing is not less than 10cm to increase the mating area between the sliding hole and the guide post and guide strip.

7. The underwater sediment sampling device according to claim 1, characterized in that, The power cord for supplying power and control to the hollow motor is equipped with a spring-loaded retractor.

8. The underwater sediment sampling device according to claim 1, characterized in that, The sampling module includes a push drive component, and a wire hole is provided at the center of the guide column for the wires of the rotary drive component and the push drive component to pass through.

Images