Ocean geological engineering sampling device and sampling method

Abstract

The application relates to the technical field of surveying and mapping equipment, in particular to a marine geological engineering sampling device and a sampling method. The device comprises a sampler and a blocking cover, the top of the sampler is provided with a lifting hook, and the bottom of the sampler is in an open shape; the lifting hook is connected with a blocking cover rotating mechanism arranged on the upper portion of the sampler, the blocking cover rotating mechanism is connected with the blocking cover through a connecting rod, the blocking cover is fixedly connected with the connecting rod, a sealing plug is arranged in the blocking cover, and the sealing plug is connected with a pushing mechanism; in the process that the blocking cover rotating mechanism drives the connecting rod to rotate, the blocking cover is swung downward until the blocking cover is rotated to the bottom of the sampler, the pushing mechanism pushes the sealing plug upward to the bottom of the sampler, and the opening at the bottom of the sampler is blocked. The device can timely block the sample after the sample is collected, leakage of the sample is avoided, and pollution is avoided; and the device is simple to operate.

Description

Technical Field

[0001] This invention relates to the field of surveying and mapping equipment technology, specifically to a marine geological engineering sampling device and sampling method. Background Technology

[0002] Marine geological engineering surveying and mapping refers to the work of investigating, measuring and analyzing marine geological environment, geological structure, seabed topography and geomorphology, and rock and soil properties by using theories and methods from multiple disciplines such as geology, geophysics, and geochemistry, as well as advanced technical means, to provide basic data and scientific basis for marine engineering construction, marine resource development and marine environmental protection.

[0003] Geophysical exploration utilizes geophysical methods such as gravity, magnetism, and seismic activity to detect seafloor strata structure, geological formations, and potential geological hazards. For example, seismic exploration can analyze the propagation characteristics of seismic waves in seafloor strata to understand the strata's layering and geological structure.

[0004] Marine drilling involves drilling holes on the seabed using drilling vessels or platforms to obtain physical samples such as rock cores for laboratory analysis. This allows for direct understanding of the lithology, physical and mechanical properties, and geological age of the seabed strata. During marine geological engineering exploration, seabed soil sampling is necessary to facilitate marine geological analysis. However, existing sampling devices lack a sealing structure at the bottom, leading to potential leakage and contamination during sample extraction after collection. Summary of the Invention

[0005] To address the technical problem that existing sampling devices lack a sealing structure at the bottom, leading to sample leakage and contamination during sample extraction after collection, this invention provides a marine geological engineering sampling device and sampling method.

[0006] This invention is achieved using the following technical solution: a marine geological engineering sampling device, comprising a sampler and a sealing cap, wherein,

[0007] The sampler has a hook at the top and an open bottom.

[0008] The hook is connected to the sealing cover rotation mechanism located on the upper part of the sampler. The sealing cover rotation mechanism is connected to the sealing cover through a connecting rod. The sealing cover is fixedly connected to the connecting rod. A sealing plug is provided inside the sealing cover. The sealing plug is connected to the pushing mechanism.

[0009] As the sealing cap rotating mechanism drives the connecting rod to rotate, it causes the sealing cap to swing downwards until the sealing cap rotates to the bottom of the sampler. The pushing mechanism then pushes the sealing plug upwards to the bottom of the sampler to seal the opening at the bottom of the sampler.

[0010] In this invention, the sealing cap rotation mechanism includes:

[0011] The first movable rod is fixed to the bottom of the hook and can move up and down;

[0012] The first fixed pin has one end fixedly connected to the push rod and can move horizontally. The first movable rod has a groove, and the other end of the first fixed pin can be inserted into the groove in the first movable rod. The first fixed pin is connected to the return spring. The horizontal reciprocating motion of the first fixed pin is realized through the push rod and the return spring.

[0013] During the up-and-down movement of the first movable rod, power is transmitted to the rotating shaft through the power transmission mechanism, thereby realizing the rotation of the rotating shaft.

[0014] The upper end of the first movable rod is fixedly connected to the hook, the lower end of the first movable rod is fixedly connected to the rack, a gear is fixed on the rotating shaft, the rack and the gear mesh with each other, and a first limiting block is fixed at the bottom end of the rack.

[0015] A locking block is fixed at the bottom of the groove of the first movable rod, and a corresponding slot is provided at the bottom of the end of the first fixed pin facing the first movable rod. When the locking block is placed in the slot, the first movable rod and the first fixed pin are connected.

[0016] A movable block is fixed in the middle of the first fixed pin, and a return spring is provided on the side of the movable block facing the push rod.

[0017] The sealing cap rotation mechanism also includes a second movable rod, the top of which is fixedly connected to the bottom of the hook, and a second limiting block is fixed to the bottom of the second movable rod;

[0018] The second movable rod has a groove, one end of the second fixed pin can be movably inserted into the groove of the second movable rod, the other end of the second fixed pin is fixedly connected to the push rod, and a movable block is fixed in the middle of the second fixed pin. A return spring is provided on the side of the movable block facing the push rod.

[0019] The sampler has a first movable groove arranged vertically inside, a first limiting groove below the first movable groove, a first movable rod movably disposed in the first movable groove, and a rack and a first limiting block movably disposed in the first limiting groove.

[0020] The sampler is provided with a gear groove, and the gear is rotatably mounted in the gear groove;

[0021] The movable block and the reset spring are set in the connecting groove inside the sampler. The movable block can move horizontally in the connecting groove. One end of the reset spring is connected to the movable block, and the other end of the reset spring is connected to the groove wall of the connecting groove.

[0022] The sealing cap has a movable inner cavity, and the sealing plug is movably disposed in the movable inner cavity. The sealing cap is provided with a fixing block.

[0023] One end of the pushing mechanism contacts the sampler, and the other end of the pushing mechanism is connected to the sealing plug. By changing the oil pressure inside the pushing mechanism, the sealing plug is driven to move upward, thus sealing the bottom opening of the sampler.

[0024] The propulsion mechanism includes:

[0025] The extrusion block is slidably disposed in the third movable groove, and the fixed block has the third movable groove on the side facing the sampler;

[0026] The first hydraulic cylinder is installed inside the fixed block, and its extendable end is connected to the extrusion block.

[0027] The second hydraulic cylinder is installed inside the sealing cover, and its telescopic end is fixedly connected to the bottom of the sealing plug. The second hydraulic cylinder is connected to the first hydraulic cylinder through a connecting block.

[0028] This application also discloses a method for sampling using the aforementioned marine geological engineering sampling device, comprising the following steps:

[0029] S1. During the process of placing the sampler into the seabed, the sealing cap rotation mechanism does not operate. At this time, the sealing cap is located outside the sampler, and the opening at the bottom of the sampler is open.

[0030] S2. After the sampler is placed on the seabed, the sealing cap rotation mechanism starts to operate. At this time, the sealing cap can rotate, and the sampler completes the sampling work.

[0031] S3. After the sampling work is completed, the sealing mechanism drives the sealing cover to rotate. The sealing cover rotates to the bottom of the sampler and below the bottom opening of the sampler.

[0032] The pushing mechanism drives the sealing plug upward until the sealing bag moves to the opening at the bottom of the sampler, sealing the bottom of the sampler.

[0033] In step S1, the push rod is pushed, which causes the first fixed pin and the second fixed pin to move, inserting the first fixed pin into the groove of the first movable rod and inserting the second fixed pin into the groove of the second movable rod. At this time, the return springs connected to the first fixed pin and the second fixed pin are both in a stretched state.

[0034] When the hook is lifted upwards, it causes the first and second movable rods to move upwards. The first movable rod causes the locking block to insert into the slot. The first fixing pin limits the first and second movable rods, fixing their positions and preventing the rack from moving up and down.

[0035] In step S2, after the sampler is placed on the seabed, the rope is loosened. Under the action of gravity, the hook drives the first movable rod to move downward. The first movable rod drives the locking block to move downward. When the locking block is disengaged from the slot, the reset spring automatically resets and drives the first fixed pin to disengage from the groove of the first movable rod through the movable block, thereby releasing the limit on the first movable rod. At the same time, the second fixed pin disengages from the groove of the second movable rod.

[0036] The bottom of the sampler is open to complete the seabed sampling.

[0037] In step S3, after sampling is completed, the hook is lifted upward by the rope. The hook drives the first movable rod to move upward, and the first movable rod drives the rack to move upward. Through the meshing transmission between the rack and the gear, the gear drives the rotating shaft to rotate. At the same time, the rotation of the rotating shaft drives the two connecting rods to rotate downward. The connecting rods drive the sealing cover to rotate downward around the rotating shaft, rotating the sealing cover to the bottom of the sampler.

[0038] When the sealing cap rotates to the bottom of the sampler, one end face of the extrusion block contacts the outer surface of the sampler, and the outer surface of the sampler exerts extrusion force on the extrusion block, causing the extrusion block to move along the third movable groove toward the inside of the groove.

[0039] The movement of the extrusion block drives the piston rod of the first hydraulic cylinder to move. The piston rod pushes the oil inside the first hydraulic cylinder out. The oil flows through the connecting pipe to the inside of the second hydraulic cylinder. Under the action of oil pressure, the piston rod of the second hydraulic cylinder extends and retracts outward, pushing the sealing plug upward until it is pushed to the bottom opening of the sampler, thus sealing the bottom of the sampler.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] (1) When using this invention, after sampling is completed, the hook is lifted upward by the rope. The hook will drive the first movable rod and the rack to move upward. The rack will drive the gear to rotate. The gear will drive the rotating shaft to rotate. The rotating shaft will drive the two connecting rods to rotate. The connecting rods will drive the sealing cover to rotate downward around the rotating shaft, so that the sealing cover rotates to the bottom of the sampler. The sampler will squeeze the extrusion block. The movement of the extrusion block will drive the piston rod of the first hydraulic cylinder to move. The piston rod will push the oil inside the first hydraulic cylinder to move. The oil will reach the inside of the second hydraulic cylinder through the connecting pipe. Finally, the oil will push the piston rod inside the second hydraulic cylinder. The piston rod will drive the sealing plug to move upward to seal the bottom of the sampler. The operation is convenient and simple.

[0042] (2) When the present invention is used, by pushing the push rod, the push rod will drive the fixing pin to be inserted into the groove of the first movable rod. Then, the hook will be lifted, and the hook will drive the first movable rod and the second movable rod to move upward. The first movable rod will drive the locking block to be inserted into the slot, thereby limiting the fixing pin. In this way, the fixing pin limits the first movable rod and the second movable rod, preventing the rack and gear from moving and ensuring the safety of the device during use. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the side cross-section structure of the sampler of the present invention;

[0045] Figure 3 This is a structural diagram of the hook and the first and second movable rods;

[0046] Figure 4 This is a schematic diagram of the cross-sectional structure of the sampler of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure at the junction of the movable block and the return spring;

[0048] Figure 6 This is a schematic diagram of the connection structure between the first movable rod and the first fixed pin of the present invention;

[0049] Figure 7 This is a schematic diagram of the sampler of the present invention when it is closed;

[0050] Figure 8 This is a schematic diagram of the sealing plug and sampler.

[0051] Figure 9 This is a schematic diagram of the sealing cap structure.

[0052] In the diagram: 1. Sampler; 2. Sealing cap; 3. Hook; 4. First movable rod; 5. Rack; 6. Gear; 7. Shaft; 8. Connecting rod; 9. First limiting block; 10. First movable groove; 11. First limiting groove; 12. Second movable rod; 13. Second limiting block; 14. Second movable groove; 15. Second limiting groove; 16. Push rod; 17. First fixing pin; 18. Movable block; 19. Return spring; 20. Guide groove; 21. Connecting groove; 22. Slot; 23. Slot; 24. Fixing block; 25. Pressing block; 26. First hydraulic cylinder; 27. Connecting pipe; 28. Second hydraulic cylinder; 29. ​​Sealing plug; 30. Third movable groove; 31. Movable inner cavity; 32. Second fixing pin. Detailed Implementation

[0053] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0054] like Figure 1 As shown, the marine geological engineering sampling device of the present invention includes a sampler 1 and a sealing cap 2. A hook 3 is provided at the top of the sampler 1, and the bottom of the sampler 1 is open. A sealing cap rotating mechanism is provided on the upper inner side of the sampler 1, and the sealing cap rotating mechanism is connected to the sealing cap 2 via a connecting rod 8. During the operation of the sealing cap rotating mechanism, the connecting rod 8 drives the sealing cap 2 to rotate, allowing the sealing cap 2 to rotate to the bottom opening of the sampler 1, thereby sealing the sampler. The bottom of the hook 3 is fixedly connected to the sealing cap rotating mechanism, which is movably disposed within the sampler 1. Figures 2 to 6 As shown, the sealing cap rotation mechanism includes a first movable rod 4, a rack 5, a gear 6, and a rotating shaft 7. The bottom of the hook 3 is fixed to the first movable rod 4, and the bottom of the first movable rod 4 is fixedly connected to the rack 5. The gear 6 is provided on the outer side of the rack 5, and the rack 5 and the gear 6 mesh with each other. The rotating shaft 7 is fixed to the center of the gear 6, and the rotating shaft 7 is rotatably connected to the sampler 1. The two ends of the rotating shaft 7 are located on the outer side of the sampler 1, and the two ends of the rotating shaft 7 located on the outer side of the sampler are connected to the sealing cap 2 through connecting rods 8.

[0055] Correspondingly, the upper end of the sampler 1 is provided with a first movable groove 10 arranged vertically. The first movable rod 4 is movably disposed within the first movable groove 10 and can move up and down within the first movable groove 10. The first movable groove 10 guides the up and down movement of the first movable rod 4. The bottom of the first movable groove 10 is provided with a first limiting groove 11 arranged vertically, which communicates with the first movable groove 10. The bottom of the rack 5 is fixed with a first limiting block 9. The rack 5 and the first limiting block 9 are movably disposed within the first movable groove 10, that is, the rack 5 and the first limiting block 9 can move up and down within the first movable groove 10. When the rack 5 moves, it simultaneously drives the first limiting block 9 to move up and down along the first limiting groove 11. When the sealing cap 2 is located at the bottom of the sampler 1, the first limiting block 9 will reach the top of the first limiting groove 11.

[0056] A second movable rod 12 is fixed to one bottom end of the hook 3, and a second limiting block 13 is fixedly connected to the bottom of the second movable rod 12. The corresponding sampler 1 has a second movable groove 14 arranged vertically inside, and the second movable rod 12 is movably disposed inside the second movable groove 14. Below the second movable groove 14 is a second limiting groove 15 arranged vertically, and the second limiting block 13 is movably disposed within the second limiting groove 15. The second movable groove 14 and the second limiting groove 15 are interconnected. The first limiting groove 11 and the second limiting groove 15 are at the same height, facilitating the balance of the sampler 1 by using the first limiting block 9 and the second limiting block 13 when lifting the hook 3.

[0057] The sampler 1 is also provided with a gear groove, and the gear 6 is rotatably disposed in the gear groove. The gear groove is connected to the first movable groove 10 and the first limiting groove 11.

[0058] The first movable rod 4 has a groove, into which a first fixing pin 17 is inserted, and one end of the first fixing pin 17 can move within the groove. In this embodiment, a locking block 23 is fixed to the bottom wall of the groove, and a corresponding locking groove is provided at the bottom of one end of the first fixing pin 17. When the locking block 23 is placed in the locking groove 22, the connection between the first movable rod 4 and the first fixing pin 17 can be realized. The other end of the first fixing pin 17 is fixedly connected to the push rod 16. A movable block 18 is fixedly connected to the middle of the first fixing pin 17, and a return spring 19 is provided on the side of the movable block 18 away from the first movable rod 4.

[0059] Similarly, the second movable rod 12 has a groove, into which a second fixing pin 32 is inserted, and one end of the second fixing pin 32 can move within the groove. In this embodiment, a locking block 23 can also be fixed to the bottom wall of the groove, and a corresponding locking groove is provided at the bottom of one end of the second fixing pin 32. When the locking block 23 is placed in the locking groove 22, the connection between the second movable rod 12 and the second fixing pin 32 can be realized. The other end of the second fixing pin 32 is fixedly connected to the push rod 16, that is, the first fixing pin 17 and the second fixing pin 32 are fixedly connected through the push rod 16. A movable block 18 is fixedly connected to the middle of the second fixing pin 32, and a return spring 19 is provided on the side of the movable block 18 away from the first movable rod 4.

[0060] like Figure 4As shown, the first movable groove 10 and the second movable groove 14 each have a guide groove 20 extending vertically on the side facing the push rod. The guide grooves 20 communicate with the first movable groove 10 and the second movable groove 14, respectively. The first fixing pin 17 is movably disposed in the guide groove 20 communicating with the first movable groove 10, and the second fixing pin 32 is movably disposed in the guide groove 20 communicating with the second movable groove 14. Each of the two guide grooves 20 has a connecting groove 21 extending vertically on the side facing the movable block, and the connecting groove 21 communicates with the guide groove 20. The movable blocks 18, which are respectively connected to the first fixing pin 17 and the second fixing pin 32, are movably disposed in the connecting grooves 21. One end of the return spring 19 is fixedly connected to the movable block 18, and the other end of the return spring 19 is fixedly connected to the inner wall of the connecting groove 21.

[0061] When the push rod 16 is pressed, the first fixing pin 17 moves along the guide groove 20 into the groove in the first movable rod 4, and the second fixing pin 32 moves along the guide groove 20 into the groove in the second movable rod 12. At this time, the movable block 18, which is fixedly connected to the first fixing pin 17 and the second fixing pin 32, moves away from the push rod. At this time, the return spring 19 between the movable block 18 and the side wall of the connecting groove 21 is in a stretched state. When the push rod 16 is released and the locking block 23 disengages from the locking groove 22, the return spring 19 automatically resets, driving the movable block 18, the first fixing pin 17, and the second fixing pin 32 to move towards the push rod, thereby disengaging the first fixing pin 17 from the first movable rod 4 and the second fixing pin 32 from the second movable rod 12.

[0062] When marine geological sampling is required, push rod 16 is pushed, which will move the first fixing pin 17 and the second fixing pin 32, causing the first fixing pin 17 to insert into the groove of the first movable rod 4 and the second fixing pin 32 to insert into the groove of the second movable rod 4. Then, the hook 3 is lifted by the rope, which will move the first movable rod 4 and the second movable rod 12 upward. The first movable rod 4 will cause the locking block 23 to insert into the groove 22, thereby limiting the first fixing pin 17. At the same time, the first fixing pin 17 limits the first movable rod 4 and the second movable rod 12, preventing the rack 5 from moving up and down. Next, the sampler 1 can be placed into the seabed for sampling by the rope.

[0063] Once the sampler 1 reaches the seabed, the rope is released. Under gravity, the hook 3 moves the first movable rod 4 downwards. The first movable rod 4 moves the locking block 23 downwards. When the locking block 23 disengages from the locking groove 22, the return spring 19 automatically returns to its original position and retracts, causing the movable block 18 to move and automatically return to its original position. The movable block 18 then moves the first fixing pin 17 out of the groove of the first movable rod 4, thereby releasing the restriction on the first movable rod 4.

[0064] After sampling is completed, the hook 3 is lifted upwards via a rope. The hook 3 drives the first movable rod 4 upwards, which in turn drives the rack 5 upwards. Through the meshing transmission between the rack 5 and the gear 6, the gear 6 drives the rotating shaft 7 to rotate. As the rotating shaft 7 rotates, it drives the two connecting rods 8 downwards. The connecting rods 8 drive the sealing cover 2 to rotate downwards around the rotating shaft 7, rotating the sealing cover 2 to the bottom of the sampler 1, thus facilitating the sealing of the bottom of the sampler 1.

[0065] like Figures 7 to 9 As shown, the sealing cap 2 corresponds to the shape of the sampler 1. The end of the sealing cap 2 facing the sampler 1 is open, while the other end is closed. The end of the sealing cap 2 facing the sampler 1 has a movable inner cavity 31, and a sealing plug 29 is provided inside the movable inner cavity 31. The sealing plug 29 can move up and down. When the sealing plug 29 moves to the bottom of the sampler 1, it seals the bottom opening of the sampler 1.

[0066] The sealing plug 29 is movably connected to the interior of the movable inner cavity 31. The sealing plug 29 moves upward along the movable inner cavity 31, so the movable inner cavity 31 guides the movement of the sealing plug 29.

[0067] A fixing block 24 is provided on the outer annular portion of the sealing cap 2. One end of the fixing block 24 is fixedly connected to the outer annular portion of the sealing cap 2. The other end of the fixing block 24, facing the sampler, is provided with a third movable groove 30. A squeezing block 25 is movably disposed within the third movable groove, meaning that the squeezing block 25 can reciprocate within the third movable groove 30. In the initial state, one end face of the squeezing block 25 is located outside the third movable groove 30.

[0068] When the sealing cap 2 rotates to the bottom of the sampler 1, one end face of the extrusion block 25 contacts the outer surface of the sampler 1, and the outer surface of the sampler 1 exerts extrusion force on the extrusion block 25, causing the extrusion block 25 to move along the third movable groove 30 toward the inside of the groove.

[0069] A first hydraulic cylinder 26 is installed inside the fixing block 24, and the telescopic end of the first hydraulic cylinder 26 is fixedly connected to the pressing block 25. The other end of the first hydraulic cylinder 26 is connected to a second hydraulic cylinder 28 through a connecting pipe 27. The second hydraulic cylinder 28 is installed inside the sealing cover 2. The telescopic end of the second hydraulic cylinder 28 is fixedly connected to the bottom of the sealing plug 29.

[0070] The extrusion block 25 moves, causing the piston rod of the first hydraulic cylinder 26 to move. The piston rod pushes the oil inside the first hydraulic cylinder 26 out. The oil flows through the connecting pipe 27 to the inside of the second hydraulic cylinder 28. Under the action of oil pressure, the piston rod of the second hydraulic cylinder 28 extends and retracts outward, pushing the sealing plug 29 upward until the sealing plug 29 is pushed to the bottom opening of the sampler 1, sealing the bottom of the sampler 1.

[0071] After sampling, the hook 3 is lifted upwards by a rope. The hook 3 drives the first movable rod 4 and the rack 5 upwards. The rack 5 drives the gear 6 to rotate through meshing transmission. The gear 6 drives the rotating shaft 7 to rotate. The rotating shaft 7 drives the connecting rods 8 at both ends and the sealing cover 2, which is fixedly connected to the connecting rods 8, to rotate downwards, so that the sealing cover 2 rotates to the bottom opening of the sampler 1. During the downward movement of the sampler 1, the outer wall of the sampler will exert a squeezing force on the extrusion block 25 in the third movable groove 30. As the extrusion block 25 moves along the third movable groove 30, it drives the piston rod of the first hydraulic cylinder 26 connected to it to move. The piston rod squeezes the oil in the first hydraulic cylinder 26 through the connecting pipe 27 into the interior of the second hydraulic cylinder 28, and pushes the piston rod of the second hydraulic cylinder 28 upwards. At the same time, it drives the sealing plug 29 to move upwards, sealing the bottom opening of the sampler 1.

[0072] This application also discloses a method for seabed sampling using the above-mentioned marine geological engineering sampling device, the method comprising the following steps.

[0073] First, push the push rod 16. The push rod 16 moves the first fixing pin 17 and the second fixing pin 32, inserting the first fixing pin 17 into the groove of the first movable rod 4 and the second fixing pin 32 into the groove of the second movable rod 4. At this time, the return springs 19 connected to the first fixing pin 17 and the second fixing pin 32 are both in a stretched state.

[0074] Lifting the hook 3 upwards causes the first movable rod 4 and the second movable rod 12 to move upwards. The first movable rod 4 will cause the locking block 23 to insert into the slot 22, thereby limiting the first fixing pin 17. At the same time, the first fixing pin 17 limits the first movable rod 4 and the second movable rod 12, fixing their positions and preventing the rack 5 from moving up and down.

[0075] In the second step, after placing the sampler 1 into the seabed, the rope is loosened. Under the action of gravity, the hook 3 drives the first movable rod 4 downward. The first movable rod 4 drives the locking block 23 downward. When the locking block 23 disengages from the locking groove 22, the return spring 19 automatically resets and, through the movable block 18, drives the first fixing pin 17 to disengage from the groove of the first movable rod 4, thereby releasing the restriction on the first movable rod 4. At the same time, the second fixing pin 32 disengages from the groove of the second movable rod 12.

[0076] The bottom of sampler 1 is open, and seabed material enters the sampler 1 through the opening at the bottom of the sampler, thus realizing seabed sampling.

[0077] Thirdly, after sampling is completed, the hook 3 is lifted upwards using a rope. The hook 3 drives the first movable rod 4 upwards, which in turn drives the rack 5 upwards. Through the meshing transmission between the rack 5 and the gear 6, the gear 6 drives the rotating shaft 7 to rotate. As the rotating shaft 7 rotates, it drives the two connecting rods 8 downwards. The connecting rods 8 drive the sealing cover 2 to rotate downwards around the rotating shaft 7, rotating the sealing cover 2 to the bottom of the sampler 1, thus facilitating the sealing of the bottom of the sampler 1.

[0078] When the sealing cap 2 rotates to the bottom of the sampler 1, one end face of the extrusion block 25 contacts the outer surface of the sampler 1, and the outer surface of the sampler 1 exerts extrusion force on the extrusion block 25, causing the extrusion block 25 to move along the third movable groove 30 toward the inside of the groove.

[0079] The extrusion block 25 moves, causing the piston rod of the first hydraulic cylinder 26 to move. The piston rod pushes the oil inside the first hydraulic cylinder 26 out. The oil flows through the connecting pipe 27 to the inside of the second hydraulic cylinder 28. Under the action of oil pressure, the piston rod of the second hydraulic cylinder 28 extends and retracts outward, pushing the sealing plug 29 upward until the sealing plug 29 is pushed to the bottom opening of the sampler 1, sealing the bottom of the sampler 1.

[0080] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A marine geological engineering sampling device, comprising a sampler and a sealing cap, characterized in that, The sampler has a hook at the top and an open bottom. The hook is connected to the sealing cover rotation mechanism located on the upper part of the sampler. The sealing cover rotation mechanism is connected to the sealing cover through a connecting rod. The sealing cover is fixedly connected to the connecting rod. A sealing plug is provided inside the sealing cover. The sealing plug is connected to the pushing mechanism. As the sealing cap rotating mechanism drives the connecting rod to rotate, it causes the sealing cap to swing downwards until the sealing cap rotates to the bottom of the sampler. The pushing mechanism then pushes the sealing plug upwards to the bottom of the sampler to seal the opening at the bottom of the sampler. The sealing cap rotation mechanism includes: The first movable rod is fixed to the bottom of the hook and can move up and down; The first fixed pin has one end fixedly connected to the push rod and can move horizontally. The first movable rod has a groove, and the other end of the first fixed pin can be inserted into the groove in the first movable rod. The first fixed pin is connected to the return spring. The horizontal reciprocating motion of the first fixed pin is realized through the push rod and the return spring. During the up-and-down movement of the first movable rod, power is transmitted to the rotating shaft through the power transmission mechanism, thereby realizing the rotation of the rotating shaft; The upper end of the first movable rod is fixedly connected to the hook, the lower end of the first movable rod is fixedly connected to the rack, a gear is fixed on the rotating shaft, the rack and the gear mesh with each other, and a first limiting block is fixed at the bottom end of the rack. A locking block is fixed at the bottom of the groove of the first movable rod, and a corresponding slot is provided at the bottom of the end of the first fixed pin facing the first movable rod. When the locking block is placed in the slot, the first movable rod and the first fixed pin are connected. A movable block is fixed in the middle of the first fixed pin, and a return spring is provided on the side of the movable block facing the push rod. The sealing cap has a movable inner cavity, and the sealing plug is movably disposed in the movable inner cavity. The sealing cap is provided with a fixing block. One end of the pushing mechanism contacts the sampler, and the other end of the pushing mechanism is connected to the sealing plug. By changing the oil pressure inside the pushing mechanism, the sealing plug is driven to move upward, thus sealing the bottom opening of the sampler.

2. The marine geological engineering sampling device according to claim 1, characterized in that, The sealing cap rotation mechanism also includes a second movable rod, the top of which is fixedly connected to the bottom of the hook, and a second limiting block is fixed to the bottom of the second movable rod; The second movable rod has a groove, one end of the second fixed pin can be movably inserted into the groove of the second movable rod, the other end of the second fixed pin is fixedly connected to the push rod, and a movable block is fixed in the middle of the second fixed pin. A return spring is provided on the side of the movable block facing the push rod.

3. A marine geological engineering sampling device according to claim 1 or 2, characterized in that, The sampler has a first movable groove arranged vertically inside, a first limiting groove below the first movable groove, a first movable rod movably disposed in the first movable groove, and a rack and a first limiting block movably disposed in the first limiting groove. The sampler is provided with a gear groove, and the gear is rotatably mounted in the gear groove; The movable block and the reset spring are set in the connecting groove inside the sampler. The movable block can move horizontally in the connecting groove. One end of the reset spring is connected to the movable block, and the other end of the reset spring is connected to the groove wall of the connecting groove.

4. The marine geological engineering sampling device according to claim 1, characterized in that, The propulsion mechanism includes: The extrusion block is slidably disposed in the third movable groove, and the fixed block has the third movable groove on the side facing the sampler; The first hydraulic cylinder is installed inside the fixed block, and its extendable end is connected to the extrusion block. The second hydraulic cylinder is installed inside the sealing cover, and its telescopic end is fixedly connected to the bottom of the sealing plug. The second hydraulic cylinder is connected to the first hydraulic cylinder through a connecting block.

5. A method for sampling using a marine geological engineering sampling device according to any one of claims 1-4, characterized in that, Includes the following steps: S1. During the process of placing the sampler into the seabed, the sealing cover rotation mechanism does not operate. At this time, the sealing cover is located outside the sampler, and the opening at the bottom of the sampler is open. S2. After the sampler is placed on the seabed, the sealing cover rotation mechanism starts to operate. At this time, the sealing cover can rotate, and the sampler completes the sampling work. S3. After the sampling work is completed, the sealing mechanism drives the sealing cover to rotate. The sealing cover rotates to the bottom of the sampler and below the bottom opening of the sampler. The pushing mechanism drives the sealing plug upward until it reaches the opening at the bottom of the sampler, thus sealing the bottom of the sampler. In step S1, the push rod is pushed, which causes the first fixed pin and the second fixed pin to move, inserting the first fixed pin into the groove of the first movable rod and inserting the second fixed pin into the groove of the second movable rod. At this time, the return springs connected to the first fixed pin and the second fixed pin are both in a stretched state. When the hook is lifted upwards, it causes the first and second movable rods to move upwards. The first movable rod causes the locking block to insert into the slot. The first fixing pin limits the first and second movable rods, fixing their positions and preventing the rack from moving up and down. In step S2, after the sampler is placed on the seabed, the rope is loosened. Under the action of gravity, the hook drives the first movable rod to move downward. The first movable rod drives the locking block to move downward. When the locking block is disengaged from the slot, the reset spring automatically resets and drives the first fixed pin to disengage from the groove of the first movable rod through the movable block, thereby releasing the limit on the first movable rod. At the same time, the second fixed pin disengages from the groove of the second movable rod. The sampler has an open bottom to collect seabed samples. In step S3, after sampling is completed, the hook is lifted upward by the rope. The hook drives the first movable rod to move upward, and the first movable rod drives the rack to move upward. Through the meshing transmission between the rack and the gear, the gear drives the rotating shaft to rotate. At the same time, the rotation of the rotating shaft drives the two connecting rods to rotate downward. The connecting rods drive the sealing cover to rotate downward around the rotating shaft, rotating the sealing cover to the bottom of the sampler. When the sealing cap rotates to the bottom of the sampler, one end face of the extrusion block contacts the outer surface of the sampler, and the outer surface of the sampler exerts extrusion force on the extrusion block, causing the extrusion block to move along the third movable groove toward the inside of the groove. The movement of the extrusion block drives the piston rod of the first hydraulic cylinder to move. The piston rod pushes the oil inside the first hydraulic cylinder out. The oil flows through the connecting pipe to the inside of the second hydraulic cylinder. Under the action of oil pressure, the piston rod of the second hydraulic cylinder extends and retracts outward, pushing the sealing plug upward until it is pushed to the bottom opening of the sampler, thus sealing the bottom of the sampler.

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