Sampling mechanism for ocean exploration

Abstract

The invention discloses a sampling mechanism for ocean exploration, the mechanism comprises a stabilizing frame, a piston sampling pipe, and a hollow pipe, a columnar pipe and a conical pipe which are arranged on the sampling pipe in a sliding manner, the pipe orifice of the piston sampling pipe is composed of a plurality of elastic sheets, and limiting plates are arranged in the gaps of the elastic sheets to prevent deflection during insertion. And through the mud film breaking mechanism, when the columnar pipe and the conical pipe move downwards, the multiple sets of movable plates are driven to extrude the elastic pieces to contract inwards, and the pipe opening mud film is directly broken. In addition, the mechanism integrates a spiral sliding groove and a spiral protruding structure, rotation and vertical linkage of the hollow pipe are achieved, threaded connection and assistance of a compressed gas bottle are combined, a closed cavity is formed to enhance local air pressure, and the suction efficiency is improved in cooperation with a negative pressure device. The device only depends on the hydraulic telescopic device for driving, does not need additional energy consumption equipment, effectively breaks the mud film and maintains the primary bedding of the sample through a dual mechanism of mechanical linkage and air pressure compensation, and is suitable for a shallow sea high-viscosity sediment sampling scene.

Description

Technical Field

[0001] The invention relates to the technical field of ocean exploration, in particular to a sampling mechanism for ocean exploration. Background Art

[0002] Marine exploration is a technical field that provides key data support for resource development (such as oil, gas, and minerals), environmental monitoring (such as pollutant migration), and scientific research (such as paleoclimate reconstruction) through systematic investigation of the seabed geological structure, resource distribution, and ecological environment. With the growth of global demand for deep-sea resources and the deepening of climate change research, obtaining high-fidelity, undisturbed seabed sediment samples has become a core means to reveal the circulation of marine materials, biogeochemical processes, and geological disaster mechanisms.

[0003] As the mainstream tool for marine sediment sampling, the core value of the piston sampler lies in the acquisition of deep, undisturbed samples through the synergistic mechanism of "mechanical insertion + negative pressure suction". In traditional designs, the sampling tube relies on gravity or external thrust to insert into the seabed sediments, and then the piston moves upward to form a negative pressure in the tube cavity, driving the sediments into the sampling tube in a stratigraphically faithful manner. This technology significantly improves the sampling depth (up to tens of meters) and sample integrity, and has become standard equipment for major projects such as the International Ocean Discovery Program (IODP) and seabed resource exploration.

[0004] Although piston samplers have significant advantages, they still face serious technical bottlenecks in viscous seabed sediments (such as clay and organic mud). High-viscosity sediments quickly form a dense mud film at the nozzle, blocking the transmission of negative pressure and causing suction failure. Existing anti-blocking solutions (such as high-pressure flushing and vibration crushing) require the introduction of additional pump groups or power sources, which not only destroy the original stratification of the sediments (disturbance rate>15%), but also greatly increase energy consumption and equipment complexity. The above defects seriously restrict the application of piston samplers in offshore high-viscosity sediment areas, and an innovative design that takes into account no disturbance, low energy consumption and high reliability is urgently needed.

[0005] For this purpose, we propose a sampling mechanism for marine exploration. Summary of the invention

[0006] The purpose of the present invention is to provide a sampling mechanism for marine exploration to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solution: comprising a stabilizing frame and a piston sampling tube arranged on the stabilizing frame for sampling seabed sediments, and the sampling mechanism for marine exploration also includes:

[0008] A hollow tube, a columnar tube and a conical tube slidably arranged on the piston sampling tube, wherein the hollow tube is connected to the columnar tube via a connecting portion 1, and the columnar tube is connected to the conical tube via a connecting portion 2, the tube mouth of the piston sampling tube is composed of a plurality of elastic sheets, and there are gaps between the plurality of elastic sheets, and a limiting plate connected to the conical tube via a connecting column is arranged in the gap, and the limiting plate is used to prevent the tube mouth elastic sheet from deflecting when plugged in;

[0009] A plurality of movable plates are installed in the cylindrical tube and the conical tube through the mud film breaking mechanism. When the conical tube and the cylindrical tube move downward and the limit plate is separated from the elastic sheet at the pipe mouth, the plurality of movable plates are driven by the mud film breaking mechanism to approach each other and squeeze the elastic sheet at the pipe mouth inward, thereby achieving the action of breaking the mud film at the pipe mouth.

[0010] As a further description of the above technical solution: the mud film breaking mechanism includes a spiral groove opened on the outer surface of the piston sampling tube, and a spiral protrusion arranged on the inner wall surface of the hollow tube and adapted to the spiral groove, and the spiral protrusion is slidably arranged in the spiral groove. When the hollow tube moves vertically, the spiral protrusion and the spiral groove adapted to each other realize the rotation movement of the hollow tube, and the conical tube is vertically slidably arranged on the surface of the piston sampling tube through a connecting frame.

[0011] As a further description of the above technical solution: the mud film breaking mechanism also includes multiple groups of movable plates in a circular array, and multiple movable plates are slidably arranged on the inner surface of the conical tube through movable blocks. A disc with a driving groove is fixed on the inner surface of the cylindrical tube, and a slider with a bottom connected to the movable plate is slidably arranged in the driving groove. When the disc rotates, the movable plate on the slider is driven by the driving groove to move on the inner surface of the conical tube.

[0012] As a further description of the above technical solution: the two symmetrically arranged movable plates form a group, and multiple groups of the movable plates are staggered in the height direction, and when each group of the movable plates moves to collide with each other, the diameters of the two movable plates after the collision are larger than the diameter of the piston sampling tube.

[0013] As a further description of the above technical solution: the connecting part 1 includes a mounting block 1 and a mounting block 2 which are slidably arranged on the top surface of the columnar tube, and the mounting block 1 and the mounting block 2 are connected by a spring 1, a rotating disk is arranged on the mounting block 2, a threaded column is threadedly arranged in the central through hole of the rotating disk, and the hollow tube is fixedly arranged on the threaded column.

[0014] As a further description of the above technical solution: when the hollow tube moves vertically and generates a rotational motion, the threaded column is driven to rotate in a direction that is tightened with the thread of the central through hole of the rotating disk.

[0015] As a further description of the above technical solution: the second connecting part includes a protrusion arranged on the conical tube and a plug-in port opened on the cylindrical tube, the protrusion is abutted against the inner surface of the plug-in port through an elastic sealing member, and mutually matching threads and screw grooves are respectively arranged at the lower side positions of the plug-in port and the protrusion.

[0016] As a further description of the above technical solution: the pitch of the threads and screw grooves on the plug-in interface and the protrusion is the same as the pitch of the spiral groove.

[0017] As a further description of the above technical solution: a plurality of groups of compressed gas bottles are arranged on the outer surface of the piston sampling tube through a mounting frame, and the plurality of groups of compressed gas bottles are mounted on the surface of a rotating disk, and a cavity is formed between the rotating disk, the columnar tube and the conical tube.

[0018] As a further description of the above technical solution: the sampling mechanism for marine exploration also includes an unlocking mechanism. When the conical tube moves downward to the maximum stroke through the connecting frame and connects the threads and grooves on the plug interface and the protrusion, the unlocking mechanism is used to separate the threaded column from the central through hole of the rotating disk.

[0019] In the above technical solution, the present invention provides a sampling mechanism for marine exploration, which has the following beneficial effects:

[0020] 1. The spiral chute and spiral protrusion are linked to realize the synchronous rotation and downward pressure of the hollow tube. Through the coordinated extrusion of the movable plate and the elastic sheet, it directly acts on the mud film at the pipe mouth, thereby effectively breaking the mud film. It only relies on the hydraulic telescopic device to drive the mechanical linkage, without the need for additional pumps or vibration sources, reducing the energy consumption of seabed sampling.

[0021] 2. Multiple sets of movable plates are staggered and have a diameter larger than the sampling tube. When the mud film fails to be broken, the tube mouth can be overlapped and closed to prevent sample leakage. After the cavity is closed, a compressed gas bottle is used to assist the negative pressure device for suction to improve the sampling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2 A partial structural diagram provided for an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a partial structure of a mud film breaking mechanism provided in an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the structure of a pipe opening of a mud film breaking mechanism provided in an embodiment of the present invention;

[0026] Figure 5A schematic diagram of a top view of a cross-section of a mud film breaking mechanism provided in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of a side view section of a mud film breaking mechanism provided by an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the structure of an unlocking mechanism and a sealing connection mechanism provided in an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the structure of a locking mechanism provided by an embodiment of the present invention;

[0030] Fig. 9 A schematic structural diagram of the external connection position of the rotating disk and the cylindrical tube provided in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Stabilizing frame; 2. Piston sampling tube; 3. Hollow tube; 31. Columnar tube; 32. Conical tube; 33. Spiral slide; 34. Tube mouth; 35. Connecting frame; 36. Limiting plate; 37. Connecting column; 38. Disc; 39. Driving groove; 310. Sliding block; 311. Movable plate; 312. Movable block; 4. Compressed gas bottle; 5. Rotating disk; 51. Threaded column; 52. Mounting block one; 53. Spring one; 54. Mounting block two; 6. Fixed block; 61. Notch; 62. Abutment rod; 7. Protrusion; 71. Sealing ring; 72. Sealing bearing; 73. Plug interface; 74. Spring two; 8. Mounting frame. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1-Figure 9 The embodiment of the present invention provides a technical solution: comprising a stabilizing frame 1 and a piston sampling tube 2 arranged on the stabilizing frame 1 for sampling seabed sediments. The stabilizing frame 1 is provided with a mechanical arm or a hydraulic telescopic device. The stabilizing frame 1 is placed in an area where seabed sediment sampling is required by hoisting and telescoping or an underwater marine submersible. Then, the mechanical arm or the hydraulic telescopic device is started to insert the piston sampling tube 2 downward into the seabed sediments. During the insertion process, the seabed sediments enter the piston sampling tube 2. In this process, a negative pressure is formed at the top of the piston sampling tube 2 through the negative pressure device on the piston sampling tube 2, so as to assist in collecting the seabed sediments.

[0035] In some special cases, when the seabed sediment has a high organic content and high viscosity, when a mud film sealing effect is generated, in order to break the mud film and enable the negative pressure device to normally generate negative pressure to suck the seabed sediment, the sampling mechanism for marine exploration also includes a hollow tube 3, a columnar tube 31 and a conical tube 32 slidably arranged on the piston sampling tube 2, wherein the hollow tube 3 is connected to the columnar tube 31 through a connecting portion 1, and the columnar tube 31 is connected to the conical tube 32 through a connecting portion 2, and the pipe mouth 34 of the piston sampling tube 2 is composed of a plurality of elastic sheets, and there are gaps between the plurality of elastic sheets, and a limit plate 36 connected to the conical tube 32 through a connecting column 37 is arranged in the gap, and the limit plate 36 is used to prevent the elastic sheet of the pipe mouth 34 from deflecting when plugged in;

[0036] It should be noted here that when the piston sampling tube 2 is pressed down by the hydraulic telescopic device, the hydraulic telescopic device not only pushes the piston sampling tube 2, but also pushes the hollow tube 3 at the same time, so that the columnar tube 31 and the conical tube 32 are inserted into the seabed sediment at the same time through the hollow tube 3. During the plug-in process, due to the existence of the limit plate 36, the gap between the elastic sheets of the pipe mouth 34 and the pipe mouth 34 is filled, and support is provided, so that during the plug-in process, the multiple elastic sheets of the pipe mouth 34 will not bend and deflect, and the multiple elastic sheets of the pipe mouth 34 and the limit plate 36 form a ring structure to reduce the plug-in resistance;

[0037] When the mud film blocking effect occurs, the hydraulic expansion device is used to close the push on the piston sampling tube 2. At this time, only the hollow tube 3 is pushed downward by the hydraulic expansion device. Through the connection part 1 and the connection part 2, the hollow tube 3 pushes the columnar tube 31 and the conical tube 32 downward. At this time, the limit plate 36 moves downward to separate from the multiple elastic plates of the pipe mouth 34. Since the sampling mechanism for marine exploration is also provided with a mud film breaking mechanism, and multiple groups of movable plates 311 are installed in the columnar tube 31 and the conical tube 32 through the mud film breaking mechanism, when the conical tube 32 and the columnar tube 31 move downward and separate the limit plate 36 from the elastic sheet of the pipe mouth 34, the multiple groups of movable plates 311 are driven by the mud film breaking mechanism to squeeze the tube. The elastic sheet at the mouth 34 contracts and squeezes inwards, and the multiple elastic plates at the position of the pipe mouth 34 contract inwards to squeeze the generated mud film, so as to achieve the breaking action of the mud film at the pipe mouth 34. After the mud film is broken, the hydraulic expansion device is controlled to restore the hollow pipe 3 to its original position. At this time, the limit plate 36 is restored to its original position. Through the provided mud film breaking mechanism, when the mud film blocking effect is generated, the movable plate 311 can be pushed by the mud film breaking mechanism to make the multiple elastic sheets of the pipe mouth 34 contract inwards and squeeze the mud film to achieve the effect of breaking the mud film. There is no need to use high-pressure flushing, vibration crushing and other methods. The mud film can be broken only by the hydraulic expansion device required for sampling by piston sampling, which reduces energy consumption and the complexity of the equipment and is suitable for popularization and use.

[0038] In one embodiment provided by the present invention, the mud film breaking mechanism includes a spiral groove 33 provided on the outer surface of the piston sampling tube 2, and a spiral protrusion provided on the inner wall surface of the hollow tube 3 and adapted to the spiral groove 33, and the spiral protrusion is slidably provided in the spiral groove 33. When the mud film needs to be broken, the hollow tube 3 is vertically moved by the hydraulic telescopic device, and the spiral protrusion and the spiral groove 33 adapted to each other realize the rotation of the hollow tube 3. At this time, the hollow tube 3 moves downward and performs a rotational motion. At this time, through the connecting part 1, the columnar tube 31 also moves downward and performs a rotational motion, and the conical tube 32 is vertically slidably provided on the surface of the piston sampling tube 2 through the connecting frame 35, so that the conical tube 32 can only move in the vertical direction. At this time, the conical tube 32 will not rotate, but only move downward, and the mud film breaking mechanism also includes a plurality of groups of movable plates 311 in a circular array, and the plurality of movable plates 311 The movable blocks 312 are all slidably arranged on the inner surface of the conical tube 32. A disk 38 with a driving groove 39 is fixedly arranged on the inner surface of the cylindrical tube 31. A slider 310 whose bottom is connected to the movable plate 311 is slidably arranged in the driving groove 39. Here, the driving groove 39 is arranged in an arc along the circular shape of the disk 38 to the outer peripheral side. In this way, when the disk 38 rotates, the driving groove 39 moves toward the center of the disk 38 through the driving slider 310, so that the multiple movable plates 311 move toward the center of the disk 38. At this time, the cylindrical tube 31 and the conical tube 32 also move downward at the same time. In this way, when the multiple movable plates 311 are close to each other, they will squeeze the multiple elastic sheets of the pipe mouth 34, so that the multiple elastic sheets shrink inward to squeeze the mud film of the pipe mouth 34, thereby achieving the destruction of the mud film of the pipe mouth 34. If it is not broken at one time, the hollow tube 3 can also be reciprocated upward several times by the hydraulic telescopic device to achieve a better effect of breaking the mud film.

[0039] There is another situation that needs to be explained here, that is, the mud film still cannot be broken by the inward contraction of the elastic sheet. At this time, the negative pressure device needs to be assisted. After the hollow tube 3 is pushed back and forth several times by the hydraulic telescopic device, it is found that the mud film is still not broken. At this time, the hollow tube 3 is continuously pushed downward by the hydraulic telescopic device until the columnar tube 31 moves to the bottom of the tube mouth 34. Since the two symmetrically arranged movable plates 311 are a group, the multiple groups of movable plates 311 are staggered in the height direction, and when each group of movable plates 311 moves to conflict with each other, the diameter of the two movable plates 311 after the conflict is greater than the diameter of the piston sampling tube 2. At this time, the through hole on the conical tube 32 generated by the upward movement of the piston sampling tube 2 is closed by the mutually conflicting movable plates 311 of each group, and the multiple groups of movable plates 311 overlap each other to improve the sealing effect;

[0040] In the process of each group of movable plates 311 approaching each other, since the cylindrical tube 31 and the conical tube 32 are connected by the connecting portion 2, in another embodiment of the present invention, the connecting portion 2 includes a protrusion 7 arranged on the conical tube 32 and a plug-in port 73 opened on the cylindrical tube 31, and the protrusion 7 is abutted against the inner surface of the plug-in port 73 through an elastic seal, and mutually matching threads and screw grooves are respectively arranged at the lower side positions of the plug-in port 73 and the protrusion 7. When the hollow tube 3, the cylindrical tube 31 and the conical tube 32 move downward together and the groups of movable plates 311 approach each other, the conical tube 32 descends to the maximum stroke, and the conical tube 3 2 no longer moves downward, while the hollow tube 3 and the columnar tube 31 are still moving downward continuously. At this time, the columnar tube 31 squeezes the elastic seal, and the elastic seal is deformed by compression. At this time, the columnar tube 31 and the tapered tube 32 are close to each other, and the columnar tube 31 is still rotating continuously under the drive of the hollow tube 3. Since the pitch of the thread and the groove on the plug-in interface 73 and the protrusion 7 is the same as the pitch of the spiral groove 33, the specifications of the thread structure are the same. In the process of the columnar tube 31 moving downward and rotating, the thread and the groove cooperate with each other and are threadedly connected until the columnar tube 31 and the tapered tube 32 are tightened with each other. At this time, the columnar tube 31 and the columnar tube 31 are relatively fixed;

[0041] It should be noted that, in another embodiment of the present invention, the connecting portion 1 includes a mounting block 1 52 and a mounting block 2 54 slidably arranged on the top surface of the columnar tube 31, and the mounting block 1 52 and the mounting block 2 54 are connected by a spring 1 53, and a rotating disk 5 is arranged on the mounting block 2 54, and a threaded column 51 is threadedly arranged on the central through hole of the rotating disk 5, and the hollow tube 3 is fixedly arranged on the threaded column 51, and when the hollow tube 3 moves vertically and generates a rotational movement, the rotation direction of the threaded column 51 is driven to be tightened with the thread of the central through hole of the rotating disk 5, so that when the hollow tube 3 is pushed downward by the hydraulic telescopic device so that the hollow tube 3 rotates and descends, the hollow tube 3 is tightened to the columnar tube 31 The tendency is used to drive the columnar tube 31 to rotate while descending in the same manner. When the columnar tube 31 and the columnar tube 31 are relatively fixed, through the unlocking mechanism, when the conical tube 32 moves downward to the maximum stroke through the connecting frame 35 and connects the threads and screw grooves on the plug interface 73 and the protrusion 7, the unlocking mechanism is used to separate the threaded column 51 from the central through hole of the rotating disk 5. At this time, the hollow tube 3 and the columnar tube 31 that are locked to each other by the tightening tendency are separated. At this time, the columnar tube 31 continues to move downward until it is pressed against the surface of the overlapping movable plates 311, so that the overlapping groups of movable plates 311 are tightly attached to the surface of the conical tube 32, further improving the blocking effect of the holes on the conical tube 32 after the piston sampling tube 2 is relatively displaced.

[0042] In another embodiment of the present invention, the unlocking mechanism includes a resisting rod 62 fixedly arranged on the conical tube 32 and a fixed block 6 fixedly arranged on the rotating disk 5. A notch 61 is provided on the fixed block 6. The notch 61 is arc-shaped as a whole. When the columnar tube 31 and the conical tube 32 are close to each other, the resisting rod 62 squeezes the notch 61 to rotate the rotating disk 5, and the spring 53 contracts and deforms. The notch 61 is also spiral, and the pitch is smaller than the spiral slide groove 33. In this way, the rotation speed is greater than that of the hollow tube 3 and the threaded column 51, and it also rotates in the same direction as the threaded column 51, which is equivalent to unlocking the threaded structure of the threaded column 51 and the central through hole of the rotating disk 5, so that the threaded column 51 and the hollow tube 3 are separated from the rotating disk 5.

[0043] In order to further improve this effect, after the hollow tube 3 is separated from the rotating disk 5, and when it continues to descend and rotate and press on the surface of the multiple groups of movable plates 311, the diameter of the hollow tube 3 is smaller than the threaded column 51. After the hollow tube 3 passes through the hole on the rotating disk 5, it continues to rotate and move downward, so that the outer surface of the hollow tube 3 and the inner surface of the columnar tube 31 are also provided with threads and screw grooves with the same specifications as the threads and screw grooves. In this way, when the hollow tube 3 is pressed on the surface of the multiple groups of movable plates 311, the outer surface of the hollow tube 3 and the inner wall surface of the columnar tube 31 are also threadedly connected, further blocking the opening, and the columnar tube 31 and the conical tube 32 are also threaded after the combination is completed. The inner part of the hollow tube 3 and the outer surface of the piston sampling tube 2 are also connected by a threaded structure combined with a threaded groove and a spiral protrusion, and are also closed. In this way, since the outer surface of the piston sampling tube 2 is provided with multiple groups of compressed gas bottles 4 through the mounting frame 8, and the multiple groups of compressed gas bottles 4 are installed on the surface of the rotating disk 5, a cavity is formed between the rotating disk 5, the columnar tube 31 and the conical tube 32, which is equivalent to the cavity being closed. At this time, the compressed gas bottle 4 is opened by the electromagnetic valve, and the compressed gas enters the closed cavity, and the local air pressure is increased, thereby assisting the negative pressure device, so that the negative pressure device can effectively generate negative pressure to extract the seabed sediment into the piston sampling tube 2;

[0044] The entire sampling mechanism only needs to drive the hydraulic expansion device to complete the breaking of the mud film and the sealing of the space, and then start the solenoid valve with an electrical signal to allow the gas in the compressed gas bottle 4 to enter the cavity, increase the local pressure, and assist the negative pressure device. It can not only break the mud film when the mud film is generated, but also seal the cavity and increase the local pressure when the breaking fails, to assist the negative pressure device to work, thereby improving the overall applicability. After the cavity is closed, when the piston sampling tube 2 is pulled upward to the sea surface by a cable or a submarine submersible, it prevents damage to the internal sample and maintains the original structure of the sample, which is conducive to the study of seabed sediments.

[0045] In another embodiment of the present invention, the elastic sealing member includes a sealing ring 71, a sealing bearing 72 and a spring 74, wherein the sealing ring 71 is mounted on the protrusion 7 through the spring 74, and the sealing ring 71 is connected to the inner end surface of the plug-in port 73 through the sealing bearing 72, and when the cylindrical tube 31 and the conical tube 32 are close to each other, the spring 74 is compressed and deformed to fix the cylindrical tube 31 and the conical tube 32 to each other.

[0046] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sampling mechanism for marine exploration, comprising a stabilizing frame (1) and a piston sampling tube (2) arranged on the stabilizing frame (1) for sampling seabed sediments, characterized in that: The marine exploration sampling mechanism also includes: A hollow tube (3), a columnar tube (31) and a conical tube (32) are slidably arranged on the piston sampling tube (2), wherein the hollow tube (3) is connected to the columnar tube (31) via a first connection portion, and the columnar tube (31) is connected to the conical tube (32) via a second connection portion, the tube mouth (34) of the piston sampling tube (2) is composed of a plurality of elastic sheets, and there are gaps between the plurality of elastic sheets, and a limiting plate (36) is arranged in the gap and is connected to the conical tube (32) via a connecting column (37), and the limiting plate (36) is used to prevent the elastic sheet of the tube mouth (34) from deflecting when plugged in; The plurality of movable plates (311) are installed in the columnar tube (31) and the conical tube (32) by means of a mud film breaking mechanism. When the conical tube (32) and the columnar tube (31) move downward and the limit plate (36) is separated from the elastic sheet at the tube mouth (34), the plurality of movable plates (311) are driven by the mud film breaking mechanism to move closer to each other and squeeze the elastic sheet at the tube mouth (34) inwardly, thereby achieving a mud film breaking action on the tube mouth (34).

2. A sampling mechanism for marine exploration according to claim 1, characterized in that: The mud film breaking mechanism comprises a spiral groove (33) provided on the outer surface of the piston sampling tube (2), and a spiral protrusion provided on the inner wall surface of the hollow tube (3) and adapted to the spiral groove (33), and the spiral protrusion is slidably provided in the spiral groove (33). When the hollow tube (3) moves vertically, the spiral protrusion and the spiral groove (33) adapted to each other realize the rotation of the hollow tube (3). The conical tube (32) is vertically slidably provided on the surface of the piston sampling tube (2) via a connecting frame (35).

3. A sampling mechanism for marine exploration according to claim 2, characterized in that: The mud film breaking mechanism also includes a plurality of groups of movable plates (311) in a circular array. The plurality of movable plates (311) are slidably arranged on the inner surface of the conical tube (32) through movable blocks (312). A disk (38) having a driving groove (39) is fixedly arranged on the inner surface of the columnar tube (31). A slider (310) having a bottom connected to the movable plate (311) is slidably arranged in the driving groove (39). When the disk (38) rotates, the movable plate (311) on the slider (310) is driven to move on the inner surface of the conical tube (32) through the driving groove (39).

4. A sampling mechanism for marine exploration according to claim 3, characterized in that: Two symmetrically arranged movable plates (311) form a group, and multiple groups of movable plates (311) are staggered in the height direction. When each group of movable plates (311) moves to contact each other, the diameters of the two movable plates (311) after contact are greater than the diameter of the piston sampling tube (2).

5. A sampling mechanism for ocean exploration according to claim 4, characterized in that: The connecting portion 1 comprises a mounting block 1 (52) and a mounting block 2 (54) which are slidably arranged on the top surface of the columnar tube (31), and the mounting block 1 (52) and the mounting block 2 (54) are connected via a spring 1 (53). A rotating disk (5) is arranged on the mounting block 2 (54), and a threaded column (51) is threadedly arranged in a central through hole of the rotating disk (5), and the hollow tube (3) is fixedly arranged on the threaded column (51).

6. A sampling mechanism for marine exploration according to claim 5, characterized in that: When the hollow tube (3) moves vertically and generates a rotational motion, the threaded column (51) is driven to rotate in a direction that is tightened with the thread of the central through hole of the rotating disk (5).

7. A sampling mechanism for marine exploration according to claim 6, characterized in that: The second connecting portion comprises a protrusion (7) arranged on the conical tube (32) and an insertion port (73) opened on the columnar tube (31); the protrusion (7) abuts against the inner surface of the insertion port (73) via an elastic sealing member, and mutually matching threads and screw grooves are respectively arranged at the lower side positions of the insertion port (73) and the protrusion (7).

8. A sampling mechanism for marine exploration according to claim 7, characterized in that: The pitch of the threads and screw grooves on the plug-in interface (73) and the protrusion (7) is the same as the pitch of the spiral groove (33).

9. A sampling mechanism for ocean exploration according to claim 8, characterized in that: The outer surface of the piston sampling tube (2) is provided with a plurality of groups of compressed gas bottles (4) via a mounting frame (8), and the plurality of groups of compressed gas bottles (4) are mounted on the surface of a rotating disk (5), and a cavity is formed between the rotating disk (5), the columnar tube (31) and the conical tube (32).

10. A sampling mechanism for ocean exploration according to claim 9, characterized in that: The marine exploration sampling mechanism also includes an unlocking mechanism, which is used to separate the threaded column (51) from the central through hole of the rotating disk (5) when the conical tube (32) moves downward to the maximum stroke through the connecting frame (35) and connects the threads and grooves on the plug interface (73) and the protrusion (7).

Images