A seabed soil sampling device for oceanographic surveying

Abstract

This invention relates to the field of sampling equipment technology, specifically to a seabed soil sampling device for marine mapping. It includes a sampling tube for storing sampled soil, a drill bit for drilling into the seabed soil, a piston, a piston rod, and a drive mechanism. The drill bit is fixedly mounted at the bottom of the sampling tube. Several sampling ports are provided on the surface of the sampling tube for the sampled soil to enter, arranged in a ring on the outer surface of the tube. This invention, through the design of the drill bit and sampling tube, features a compact overall structure, making it easy to carry and operate. The unique shape of the drill bit allows it to easily penetrate the seabed soil layer, reducing resistance during sampling and improving sampling efficiency. The ingenious combination of the sampling tube and the drill bit ensures the accuracy and integrity of the sampling, effectively obtaining representative seabed soil samples.

Description

Technical Field

[0001] This invention relates to the field of sampling equipment technology, specifically to a seabed soil sampling device for marine mapping. Background Technology

[0002] The ocean covers approximately 71% of the Earth's surface. Seafloor sediments, as a crucial component of the marine ecosystem, carry vital information about Earth's environmental evolution, marine geological changes, marine biological activity, and the distribution of seafloor resources. Among these, soft seafloor mud (such as silt, soft clay, and silty soil) is one of the most widely distributed and information-rich sediment types. Seafloor soft mud not only contains the evolutionary codes of paleoclimate and paleo-marine environments, but its physical and mechanical properties, chemical composition, and microbial community structure also directly relate to the development of various fields, including submarine engineering construction (such as submarine pipeline laying, offshore wind power foundation construction, and cross-sea bridge pile foundation construction), marine resource exploration (such as natural gas hydrates, polymetallic nodules, and other seafloor mineral resources), marine environmental protection (such as tracing the source of seafloor pollution and studying pollutant migration patterns), and early warning of marine geological disasters (such as submarine landslides and silty coastal erosion). Therefore, efficient and accurate sampling of seafloor soft mud is a fundamental prerequisite for conducting various marine-related research and engineering practices.

[0003] Currently, existing seabed soft mud sampling devices are mainly divided into two categories: suction-type and dredging-type. Although both types of devices can achieve basic sampling functions, they both have obvious limitations and are difficult to adapt to complex seabed environments and high-precision sampling requirements. Among them, suction-type sampling devices mainly rely on the adsorption force generated by the adsorption tube to grab soft mud samples. Its core depends on the installation and adjustment of the adsorption tube, which is greatly affected by the tube length, installation accuracy, and deep-sea water pressure. In deeper waters, the transportation and installation of the adsorption tube become significantly more difficult, and the high pressure in the deep sea can easily lead to a decrease in the sealing performance of the tube, which not only greatly reduces the sampling efficiency but also easily... Problems such as sample leakage and contamination occur, making it impossible to meet the sampling needs of deep sea areas. Dredging-type sampling devices obtain soil samples through mechanical digging actions. Their complex structural design includes multiple transmission and digging components, resulting in a large overall size and heavy weight. This not only requires specialized hoisting equipment and operating vessels, increasing the cost of sampling operations, but also makes it difficult to operate flexibly in seabed areas with large topographic relief and complex currents. Furthermore, the transportation and debugging processes are cumbersome and the operation is not convenient. In view of this, we propose a seabed soil sampling device for marine mapping to solve the above-mentioned technical problems. Summary of the Invention

[0004] This invention provides the following technical solution: a seabed soil sampling device for marine mapping, comprising: The sampling tube is used to store the sampled soil and the drill bit is used to drill into the seabed soil. The drill bit is fixedly installed at the bottom of the sampling tube. The sampling tube has a sampling port on its surface for the sampled soil to enter. The sampling tube is a slender hollow column with an open top, extending longitudinally along the central axis of the device. The whole is a regular cylinder with a length much greater than its radial dimension. The piston is slidably mounted inside the sampling tube; The piston rod is fixedly installed inside the piston and extends to the top of the sampling tube; The drive mechanism is fixedly installed at the top of the sampling tube and is used to drive the piston to move upward along the inner wall of the sampling tube, so as to suck the seabed soil into the sampling tube through the sampling port for storage.

[0005] As a preferred embodiment of the present invention, the number of sampling ports is several, and the several sampling ports are distributed in a ring on the outer surface of the sampling tube. In the initial state, the piston is located between the several sampling ports, and a rubber sealing ring suitable for matching the inner wall of the sampling tube is fixedly provided around the piston.

[0006] As a preferred embodiment of the present invention, the sampling tube has threads at the bottom, and the drill bit is detachably fastened to the bottom of the sampling tube by the threads. The drill bit is a tapered structure that gradually narrows from top to bottom, with a pointed bottom, and the drill bit is made of high manganese carbon steel.

[0007] As a preferred embodiment of the present invention, the lower part of the outer wall of the sampling tube is provided with a plurality of drainage holes, which are arranged in a ring and are all located at the bottom of the sampling port for drainage. The inner wall of the sampling port is provided with a plurality of annularly distributed exhaust channels to its outer wall.

[0008] As a preferred embodiment of the present invention, the driving mechanism includes a driving housing threaded onto the top of the sampling tube and a slot formed on the inner wall of the driving housing. The driving mechanism also includes a Y-shaped base fixedly mounted on the outer wall of the piston rod. The Y-shaped base is located inside the driving housing and has three radially distributed top supports. Each top support has two bearing seats fixedly arranged along its own extension axis. A snap-fit ​​arm is provided for each top support, and the snap-fit ​​arm is rotatably fitted with the two bearing seats on the corresponding top support. The end of the driving housing is snapped into the slot. There are three sets of snap-fit ​​arms, which correspond one-to-one with the three top supports of the Y-shaped base.

[0009] As a preferred embodiment of the present invention, a wedge surface is provided at one end of the snap-fit ​​arm near the center of the Y-shaped base, a sliding sleeve is slidably installed around the piston rod, a sliding hole for sliding connection with the piston rod is provided in the middle of the sliding sleeve, and a chamfer is provided on the edge of the sliding sleeve to match the angle of the wedge surface.

[0010] As a preferred embodiment of the present invention, three ring-shaped lifting rods are fixedly installed on the top of the sliding sleeve, and a lifting seat is fixedly installed around the three lifting rods. The lifting seat is fixedly connected to a steel cable through a cap buckle. A spring seat is fixedly installed around the piston rod. In the initial state, there is a gap between the bottom of the spring seat and the top of the sliding sleeve. A return spring is fixedly installed between the bottom of the spring seat and the top of the sliding sleeve, and the return spring is sleeved around the piston rod.

[0011] As a preferred embodiment of the present invention, a groove is provided on the back side of each of the three snap-fit ​​arms, and a reset elastic ring is sleeved around the periphery of the three grooves. The reset elastic ring is made of a material with its own rebound properties.

[0012] As a preferred embodiment of the present invention, the bottom of the drive housing is provided with a mounting groove, a magnetic ring is fixedly installed inside the mounting groove, the bottom of the hammer is magnetically attracted to the hammer, and the inner wall of the hammer is slidably connected to the outer wall of the piston rod.

[0013] As a preferred embodiment of the present invention, a mud-proof sleeve is slidably installed around the sampling tube. In the initial state, the mud-proof sleeve is located around several sampling ports. The mud-proof sleeve is composed of a flat bottom part and an upper conical part. The upper conical part is a trumpet-shaped conical structure that expands outward from bottom to top. Its lower end is smoothly connected to the upper end of the flat bottom part, and the upper end forms an outwardly folded annular opening. Four annularly distributed fins are also provided on the outer wall of the mud-proof sleeve. A magnetic ring II is also provided on the sampling tube. The magnetic ring II is clamped and fixed by the lower end of the sampling tube and the upper opening of the conical drill bit to form axial positioning.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention features a compact overall structure through the design of the drill bit and sampling tube, making it easy to carry and operate. The unique shape of the drill bit allows it to easily cut into the seabed soil layer, reducing resistance during the sampling process and improving sampling efficiency. The ingenious combination of the sampling tube and the drill bit ensures the accuracy and integrity of the sampling, and can effectively obtain representative seabed soil samples.

[0015] 2. During the deployment process of the sampling device of the present invention, due to the elastic force of the return spring, the sliding sleeve cannot move upward, preventing the locking arm from disengaging from the locking groove. Therefore, the piston rod and piston will not move upward prematurely under the pulling force of the drive mechanism, ensuring that the piston can remain stably in the initial position during the deployment of the sampling device to the seabed and will not move prematurely due to external factors. This ensures that the internal space of the sampling tube remains closed before the sampling device reaches the predetermined sampling position, effectively preventing seawater or other impurities from entering the sampling tube prematurely. This provides a reliable guarantee for the subsequent accurate acquisition of seabed soil samples and improves the purity and quality of the sampled samples.

[0016] 3. After the drill bit of this invention comes into contact with the seabed mud, it is decelerated by the adhesion of the mud. The sampling device decelerates rapidly until it stops in a short time. Due to inertia, the hammer breaks away from the attraction of the magnetic ring and strikes the top of the piston rapidly downward along the piston rod axis. This generates a downward impact force on the top of the piston. This impact force can better drive the drill bit into the mud at a deeper depth on the seabed, thereby enhancing the stability of the sampling device in the seabed mud and ensuring that the sampling device will not easily shift due to factors such as seawater flow or minor seabed vibrations during subsequent sampling.

[0017] 4. After the device is embedded in the seabed mud, the mud adheres to it, increasing the resistance to its upward movement. Due to the weight of the device and the adhesion of the mud, the three booms drive the sliding sleeve upwards. The sliding sleeve slides upwards relative to the piston rod, pressing against the wedge surface. This causes the locking arm to rotate around the bearing seat and disengage from the slot. The Y-shaped base is then no longer restricted by the drive housing. The lifting seat continues to move the sliding sleeve upwards via the booms. During this upward movement, the special design of the wedge surface and sliding hole continuously applies force to the locking arm, ensuring it remains in a rotated, extended state and preventing it from re-entering the slot. Simultaneously, the piston rod also begins to move upwards under the influence of the sliding sleeve. Since the piston is fixedly mounted on the piston rod and has a rubber sealing ring around it, the piston slides upwards inside the sampling tube, creating a negative pressure environment. Under this pressure difference, the seabed mud is drawn into the sampling tube through several sampling ports arranged in a ring on its surface, thus achieving seabed soil sampling. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side cross-sectional view of the sampling tube in this invention; Figure 3 This is a side sectional view of the drive mechanism in this invention; Figure 4 In this invention Figure 3 A magnified structural diagram of part A; Figure 5 In this invention Figure 3 A schematic diagram of the enlarged structure of part B; Figure 6 This is a schematic diagram showing the detailed structure of the drive mechanism in this invention; Figure 7 This is a schematic diagram of the resetting elastic ring in this invention; Figure 8 This is a schematic diagram of the planar structure of the driving mechanism in this invention.

[0019] In the diagram: 100, sampling tube; 101, sampling port; 102, exhaust channel; 103, thread; 104, drain hole; 200, drill bit; 300, piston; 400, piston rod; 600, drive mechanism; 601, drive housing; 602, slot; 603, Y-shaped base; 604, bearing seat; 605, snap-fit ​​arm; 6051, groove; 606, wedge surface; 607, sliding sleeve; 6071, sliding hole; 608, lifting rod; 609, lifting seat; 6010, reset elastic ring; 6011, spring seat; 6012, reset spring; 6013, mounting groove; 6014, magnetic ring one; 6015, hammer; 800, anti-mud and sand sleeve; 801, fin; 802, magnetic ring two. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 8 The technical solution provided by the present invention specifically includes the following embodiments: A seabed soil sampling device for marine mapping includes a sampling tube 100 for storing sampled soil, a drill bit 200 for drilling into the seabed soil, a piston 300, a piston rod 400, and a drive mechanism 600. The drill bit 200 is fixedly installed at the bottom of the sampling tube 100. The surface of the sampling tube 100 has several sampling ports 101 for soil to enter. These ports are arranged in a ring on the outer surface of the sampling tube 100. Initially, the piston 300 is positioned between the sampling ports 101, and the sampling tube 100 is open at the top. The slender, hollow cylindrical opening extends longitudinally along the central axis of the device, forming a regular cylindrical shape. Its length is much greater than its radial dimension. The piston 300 is slidably installed inside the sampling tube 100. A rubber sealing ring suitable for matching the inner wall of the sampling tube 100 is fixedly installed around the piston 300. The piston rod 400 is fixedly installed inside the piston 300 and extends to the top of the sampling tube 100. The drive mechanism 600 is fixedly installed at the top of the sampling tube 100 and is used to drive the piston 300 to move upward along the inner wall of the sampling tube 100, drawing seabed soil into the sampling tube 100 for storage through the sampling port 101. In use, the seabed soil sampling device is deployed to the seabed using a drop device. Under the influence of gravity, the sampling device undergoes free fall towards the seabed. It is important to note that the drill bit 200 is relatively heavy, designed to ensure that the sampling device maintains a stable posture during its descent, quickly penetrating the seawater layer and successfully drilling into the seabed soil. The drill bit 200 first contacts the seabed soil and, relying on its conical structure and the hardness of its high-manganese carbon steel material, begins to drill into the seabed mud. As the drill bit 200 gradually penetrates deeper, the sampling tube 100, with the assistance of gravity, maintains a vertical position and follows. After the device contacts the seabed soil, the entire device is embedded in the seabed mud. Then, a winch on the sea surface secures the steel cable. The steel cable is connected to the delivery device, which pulls the drive mechanism 600 upward, ultimately causing the piston rod 400 to move upward, thereby pushing the piston 300 to slide upward inside the sampling tube 100. Since the piston 300 is equipped with a rubber sealing ring, the sealing of the inside of the sampling tube 100 can be effectively guaranteed. As the piston 300 moves, a negative pressure environment is formed inside the sampling tube 100. At this time, the seabed soil is sucked into the sampling tube 100 through several sampling ports 101 arranged in a ring on the surface of the sampling tube 100 under the action of pressure difference. The required seabed soil sample is then stored in the sampling tube 100. Subsequently, the seabed soil sampling device can be retrieved from the seabed by the recovery device.

[0022] For further details, please refer to [link / reference]. Figure 2 , Figure 3 As shown: The sampling tube 100 has a thread 103 at its bottom. The drill bit 200 is detachably fastened to the bottom of the sampling tube 100 via the thread 103. The drill bit 200 is a tapered structure that gradually narrows from top to bottom, with a pointed bottom. The drill bit 200 is made of high-manganese carbon steel. The tapered structure design of the drill bit 200 reduces resistance and improves drilling efficiency when drilling into the seabed soil. At the same time, the high-manganese carbon steel material ensures the hardness and wear resistance of the drill bit 200, enabling it to adapt to the complex geological environment of the seabed. The thread 103 not only facilitates the assembly and disassembly of the drill bit 200 and the sampling tube 100, but also ensures the firmness of the connection between the two, preventing loosening or detachment due to external forces during sampling. Moreover, this detachable design also facilitates the maintenance and replacement of the drill bit 200. When the drill bit 200 is worn or damaged, a new drill bit 200 can be replaced in a timely manner to ensure the normal use of the sampling device.

[0023] For further details, please refer to [link / reference]. Figure 2 , Figure 4 As shown: The lower part of the outer wall of the sampling tube 100 has several drainage holes 104 arranged in a ring, and all drainage holes 104 are located at the bottom of the sampling port 101 for drainage. The inner wall of the sampling port 101 has several annularly arranged venting channels 102. The design of the drainage holes 104 allows the sampling tube 100 to smoothly discharge excess seawater when it is lifted out of the seabed, avoiding dilution or interference of seawater with the soil sample, thereby ensuring the purity and accuracy of the soil sample. The venting channels 102 can expel air from the sampling tube 100 during the upward movement of the piston 300, preventing the piston 300 from being obstructed. At the same time, the expelled air can agitate the soil around the sampling tube 100, making the soil easier to be sucked into the sampling tube 100.

[0024] For further details, please refer to [link / reference]. Figures 5-8 As shown: The drive mechanism 600 includes a drive housing 601 threaded onto the top of the sampling tube 100, and a slot 602 formed on the inner wall of the drive housing 601. The drive mechanism 600 also includes a Y-shaped base 603 fixedly mounted on the outer wall of the piston rod 400. The Y-shaped base 603 is located inside the drive housing 601 and has three radially distributed top supports. Each top support has two bearing seats 604 fixedly mounted along its own extending axis. A snap-fit ​​arm 605 is provided corresponding to each top support, and the snap-fit ​​arm 605 is rotatably engaged with the two bearing seats 604 on the corresponding top support. The end of the drive housing 601 is snapped into the slot 602. There are three sets of snap-fit ​​arms 605, each engaging with the Y-shaped base 603. The three top support edges are matched one by one. The end of the snap-fit ​​arm 605 near the center of the Y-shaped base 603 is provided with a wedge surface 606. A sliding sleeve 607 is slidably installed on the periphery of the piston rod 400. A sliding hole 6071 for sliding connection with the piston rod 400 is opened in the middle of the sliding sleeve 607. A chamfer adapted to the angle of the wedge surface 606 is opened on the edge of the sliding sleeve 607. Three ring-shaped lifting rods 608 are fixedly installed on the top of the sliding sleeve 607. A lifting seat 609 is fixedly installed on the periphery of the three lifting rods 608. A steel cable is fixedly connected to the lifting seat 609 through a cap buckle. A spring upper seat 6011 is fixedly installed on the periphery of the piston rod 400. In the initial state, there is a gap between the bottom of the spring upper seat 6011 and the top of the sliding sleeve 607. A return spring 6012 is fixedly installed between the bottom of the spring upper seat 6011 and the top of the sliding sleeve 607. The return spring 6012 is sleeved on the periphery of the piston rod 400.When deploying the sampling device, an external winch rapidly lowers the lifting seat 609 via a steel cable. The lifting seat 609, via three booms 608, moves the sliding sleeve 607 downwards. Here, the spring force of the return spring 6012 is greater than the weight of the sampling device, so the return spring 6012 will not be compressed. At this time, the locking arm 605 is stably locked inside the locking groove 602. When the sampling device is embedded in the seabed mud, the external winch slowly and uniformly raises the lifting seat 609 upwards via a steel cable. At this time, the seabed mud will cause adhesion to the sampling device, making... As the resistance to the upward movement of the sampling device increases, the lifting seat 609, under the weight of the sampling device and the adhesion of the soil, drives the sliding sleeve 607 upward via the three lifting rods 608. At this time, due to the cooperation between the sliding hole 6071 and the wedge surface 606, and the spring force of the return spring 6012 being less than the sum of the weight of the sampling device and the adhesion force of the soil, the sliding sleeve 607 slides upward relative to the piston rod 400, pressing the wedge surface 606, causing the locking arm 605 to rotate around the bearing seat 604 and disengage from the locking groove 602. After step 2, the Y-shaped base 603 is no longer restricted by the drive housing 601. Under the continued pulling action of the external winch on the steel cable, the lifting seat 609 drives the sliding sleeve 607 to move upward through the boom 608. During the upward movement of the sliding sleeve 607, due to the special design of the wedge surface 606 and the sliding hole 6071, a force is continuously applied to the locking arm 605 to ensure that the locking arm 605 is in a rotated and unfolded state, preventing it from getting stuck in the slot 602 again. At the same time, the piston rod 400 also begins to move upward under the drive of the sliding sleeve 607. Since the piston 300 is fixedly installed... A rubber sealing ring is provided on the piston rod 400 and around it. The piston 300 slides upward inside the sampling tube 100, creating a negative pressure environment inside the sampling tube 100. Under the action of pressure difference, the seabed soil is sucked into the sampling tube 100 through several sampling ports 101 distributed in a ring on the surface of the sampling tube 100, thus realizing seabed soil sampling. When the piston 300 moves to the top dead center position, since the piston 300 can no longer move upward, the lifting seat 609 can be pulled out of the soil by the continuous lifting of the external winch and raised to the sea surface.

[0025] For further details, please refer to [link / reference]. Figure 7 As shown: Each of the three snap-fit ​​arms 605 has a groove 6051 on its back side. A reset elastic ring 6010 is fitted around each of the three grooves 6051. The reset elastic ring 6010 is made of a material with inherent spring-like properties. During the process where the lifting seat 609 drives the sliding sleeve 607 upwards and the snap-fit ​​arms 605 are in a rotating and unfolded state, when the external winch stops lifting, the reset elastic ring 6010, due to its spring-like properties, applies an inward pulling force to the three snap-fit ​​arms 605, causing them to tend to converge towards the center. This prepares them for subsequent re-engaging into the slots 602, allowing the entire sampling device to repeat sampling operations and improve sampling efficiency. The design of the grooves 6051 prevents the reset elastic ring 6010 from slipping out, ensuring smooth sampling operations.

[0026] For further details, please refer to [link / reference]. Figure 5 As shown: The bottom of the drive housing 601 has a mounting groove 6013, inside which a magnetic ring 6014 is fixedly installed. The bottom of the hammer 6015 is magnetically attached to the hammer, and the inner wall of the hammer 6015 is slidably connected to the outer wall of the piston rod 400. When the drill bit 200 comes into contact with the seabed mud, it is decelerated by the adhesion of the mud, and the sampling device decelerates rapidly until it stops in a short time. Due to inertia, the hammer 6015 breaks free from the attraction of the magnetic ring 6014 and strikes the top of the piston 300 rapidly downward along the piston rod 400 axis. This generates a downward impact force on the top of the piston 300, which can better drive the drill bit 200 deeper into the seabed mud, thereby enhancing the stability of the sampling device in the seabed mud and ensuring that the sampling device will not easily shift due to seawater flow or minor seabed vibrations during subsequent sampling.

[0027] For further details, please refer to [link / reference]. Figure 2 As shown: A sediment-proof sleeve 800 is slidably installed around the sampling tube 100. Initially, the sediment-proof sleeve 800 is located around several sampling ports 101. The sediment-proof sleeve 800 consists of a flat bottom section and an upper conical section. The upper conical section is a trumpet-shaped conical structure that expands outwards from bottom to top. Its lower end smoothly transitions to the upper end of the flat bottom section, and the upper end forms an outwardly folded annular opening. Four annularly distributed fins 801 are also provided on the outer wall of the sediment-proof sleeve 800. A magnetic ring 802 is also provided on the sampling tube 100. The magnetic ring 802 is clamped and fixed by the lower end of the sampling tube 100 and the upper opening of the conical drill bit 200, forming axial positioning. During the downward movement of the sampling device, as the drill bit 200 and the sampling tube 100 penetrate into the seabed mud, the sediment-proof sleeve 800... The bottom of the sampling tube 100 moves upward along the axial direction due to the resistance of the seabed mud, thus exposing several sampling ports 101. When the sampling device completes sampling and is lifted upward, the anti-mud sleeve 800 moves downward along the axial direction of the sampling tube 100 under its own weight, covering several sampling ports 101 again. Furthermore, the bottom of the anti-mud sleeve 800 is attracted to the magnetic ring 802, preventing seabed mud from entering the sampling tube 100 through the sampling ports 101 during the lifting process of the sampling device, thus preventing contamination or interference with the soil sample. This ensures the purity and accuracy of the soil sample. In addition, the trumpet-shaped conical structure of the upper conical part of the anti-mud sleeve 800 can play a certain guiding role during the descent of the sampling device, making it easier for the sampling device to vertically penetrate into the seabed mud.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A seabed soil sampling device for oceanographic surveying, characterised in that: include: The sampling tube (100) for storing sampled soil and the drill bit (200) for drilling into the seabed soil are fixedly installed at the bottom of the sampling tube (100). The sampling tube (100) has a sampling port (101) for the sampled soil to enter on its surface. The sampling tube (100) is a slender hollow column with an open top, extending longitudinally along the central axis of the device. The whole is a regular cylinder, and its length is much greater than its radial dimension. The piston (300) is slidably installed inside the sampling tube (100); The piston rod (400) is fixedly installed inside the piston (300) and extends to the top of the sampling tube (100); The driving mechanism (600) is fixedly installed on the top of the sampling tube (100) and is used to drive the piston (300) to move upward along the inner wall of the sampling tube (100) to suck the seabed soil into the sampling tube (100) through the sampling port (101) for storage. The number of sampling ports (101) is several, and the several sampling ports (101) are distributed in a ring on the outer surface of the sampling tube (100). In the initial state, the piston (300) is located between the several sampling ports (101), and a rubber sealing ring suitable for matching the inner wall of the sampling tube (100) is fixedly provided on the periphery of the piston (300). The sampling tube (100) has a thread (103) at the bottom. The drill bit (200) is detachably fastened to the bottom of the sampling tube (100) by the thread (103). The drill bit (200) is a tapered structure that gradually narrows from top to bottom, with a pointed bottom. The drill bit (200) is made of high manganese carbon steel. The lower part of the outer wall of the sampling tube (100) is provided with a number of drainage holes (104), the drainage holes (104) are arranged in a ring, and the drainage holes (104) are all located at the bottom of the sampling port (101) for drainage. The inner wall of the sampling port (101) is provided with a number of annularly distributed exhaust channels (102) to its outer wall. The drive mechanism (600) includes a drive housing (601) threaded onto the top of the sampling tube (100) and a slot (602) formed on the inner wall of the drive housing (601). The drive mechanism (600) also includes a Y-shaped base (603) fixedly mounted on the outer wall of the piston rod (400). The Y-shaped base (603) is located inside the drive housing (601). The Y-shaped base (603) has three radially distributed top supports. Each top support is fixedly provided with two bearing seats (604) along its own extension axis. A snap-fit ​​arm (605) is provided for each top support. The snap-fit ​​arm (605) is rotatably fitted with the two bearing seats (604) on the corresponding top support. The end of the drive housing (601) is snapped into the slot (602). There are three sets of snap-fit ​​arms (605), which correspond to the three top supports of the Y-shaped base (603) one by one.

2. The seabed soil sampling device for marine mapping according to claim 1, characterized in that: The snap-fit ​​arm (605) has a wedge surface (606) at one end near the center of the Y-shaped base (603). A sliding sleeve (607) is slidably installed around the piston rod (400). A sliding hole (6071) for sliding connection with the piston rod (400) is opened in the middle of the sliding sleeve (607). A chamfer adapted to the angle of the wedge surface (606) is opened on the edge of the sliding sleeve (607).

3. A seabed soil sampling device for marine mapping according to claim 2, characterized in that: Three ring-shaped lifting rods (608) are fixedly installed on the top of the sliding sleeve (607). A lifting seat (609) is fixedly installed around the three lifting rods (608). A steel cable is fixedly connected to the lifting seat (609) through a cap buckle. A spring seat (6011) is fixedly installed around the piston rod (400). In the initial state, there is a gap between the bottom of the spring seat (6011) and the top of the sliding sleeve (607). A return spring (6012) is fixedly installed between the bottom of the spring seat (6011) and the top of the sliding sleeve (607). The return spring (6012) is sleeved around the piston rod (400).

4. A seabed soil sampling device for marine mapping according to claim 3, characterized in that: Each of the three snap-fit ​​arms (605) has a groove (6051) on its back side, and a reset elastic ring (6010) is fitted around the three grooves (6051). The reset elastic ring (6010) is made of a material with its own spring-like properties.

5. A seabed soil sampling device for marine mapping according to claim 4, characterized in that: The bottom of the drive housing (601) is provided with a mounting groove (6013), and a magnetic ring (6014) is fixedly installed inside the mounting groove (6013). A hammer (6015) is magnetically attracted to the bottom of the magnetic ring (6014), and the inner wall of the hammer (6015) is slidably connected to the outer wall of the piston rod (400).

6. A seabed soil sampling device for marine mapping according to claim 5, characterized in that: A mud-proof sleeve (800) is slidably installed around the sampling tube (100). In the initial state, the mud-proof sleeve (800) is located around several sampling ports (101). The mud-proof sleeve (800) is composed of a flat bottom part and an upper conical part. The upper conical part is a trumpet-shaped conical structure that expands outward from bottom to top. Its lower end is smoothly connected to the upper end of the flat bottom part, and the upper end forms an outward folded annular opening. Four annularly distributed fins (801) are also provided on the outer wall of the mud-proof sleeve (800). A magnetic ring II (802) is also provided on the sampling tube (100). The magnetic ring II (802) is clamped and fixed by the lower end of the sampling tube (100) and the upper opening of the conical drill bit (200) to form axial positioning.

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