On-site sampling device and method for large-diameter sediment sampler

Abstract

The present invention discloses an on-site sampling operation device and operation method of a large-caliber sediment sampler, which includes a hoisting structure, an anti-slip structure, an ejection structure, and a pipe-shaving structure. The sampling tube is hoisted by the hoisting structure, and the anti-slip structure is installed at the interface of the sampling tube to segment the sample in the sampling tube while preventing the sample in the sampling tube from falling off during hoisting. The sample in the sampling tube is then ejected by the ejection structure, thereby improving the sampling efficiency. The sample tube is segmented and then split open by the pipe-shaving structure, thereby facilitating subsequent analysis of the sample. The above operation process method can well solve the lifting, anti-slip, ejection, and sample separation operations in the process of large-caliber vertical retractable sediment sampling, ensure sample quality, facilitate sample transportation, facilitate subsequent analysis of the sample, greatly improve sampling efficiency, and ensure the integrity and authenticity of the sample.

Description

Technical Field

[0001] The present invention relates to the technical field of seabed sediment sampling, in particular to an on-site sampling operation device and an operation method of a large-caliber sediment sampler. Background Art

[0002] When conducting seabed geological identification and evaluation research, only by obtaining undisturbed samples of seabed sediments can we directly measure the sediment particle size, structure, composition and age, and thus obtain the corresponding geological conditions.

[0003] During the sampling tube recovery process, for large-diameter sediment samplers (diameter exceeding 200mm), since the sampling tubes contain samples, the total weight of several sampling tubes and sampling cutter heads far exceeds the lifting capacity of the auxiliary crane / folding arm crane on the ship. In addition, during the vertical sediment sampling process, when the sampling tubes are vertically split, the samples are continuous at the interface of the two tubes. If measures are not taken to separate them, the samples may slip and be lost under the action of gravity. In addition, if the sample tube is not full, the top sample is relatively thin and is prone to collapse when the tube is turned over without blocking, resulting in the sample not being able to truly reflect the seabed geological conditions. The existing technology lacks a complete and thorough operating method for achieving efficient and reliable sampling after the sampling tubes are recovered on board. Summary of the Invention

[0004] In order to overcome the above problems existing in the prior art, the present invention proposes an on-site sampling operation device and operation method of a large-caliber sediment sampler.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a large-caliber sediment sampler on-site sampling operation device, including an anti-slip structure and an ejection structure, the anti-slip structure includes an anti-slip fixing plate, a plug-in plate guide plate, a plug-in plate, and a driving module, the driving module is installed in the plug-in plate guide plate, the driving shaft of the driving module extends to one side of the plug-in plate guide plate and is fixedly connected to the wheel axle, the plug-in plate is located in the plug-in plate guide plate and is driven to move back and forth by the driving module, the plug-in plate guide plate is fixedly provided with an anti-slip fixing plate on the side away from the driving shaft, and the anti-slip fixing plate is provided with a groove for the plug-in plate to pass through;

[0006] The ejection structure includes a sampling tube ejection module and a bracket. The sampling tube ejection module includes a sampling tube fixing sleeve, a cylinder, and an ejection plate. A base is provided below the sampling tube fixing sleeve, a through hole is provided in the middle of the base, the cylinder telescopic rod passes through the through hole and is connected to the ejection plate, a sample tube positioning plate is fixedly provided above the ejection plate, the sampling tube fixing sleeve is installed at the sampling tube joint during operation, and the sampling tube installed with the sampling tube ejection module is placed on the bracket.

[0007] The above-mentioned large-diameter sediment sampler on-site sampling operation device also includes a lifting structure, which is used to lift multiple connected sampling tubes recovered on board. The lifting structure includes a main steel cable, a branch steel cable, a lifting tension pin, a lifting lug, and a lifting fixing plate. A lifting lug is provided in the middle position above the lifting fixing plate. The main steel cable and the branch steel cable are installed at the lifting lug through the lifting tension pin. The main steel cable is connected to the main cable of the A frame on the ship, and the branch steel cable is connected to the auxiliary crane / folding arm crane.

[0008] The above-mentioned large-diameter sediment sampler on-site sampling operation device also includes a tube planing structure, which includes a radial tube planing structure and an axial tube planing structure. The radial tube planing structure includes a radial mounting plate, a radial cutter, a positioning mounting baffle, and a positioning assembly. The radial mounting plate includes a first mounting plate located in the middle, a second mounting plate and a third mounting plate installed on both sides of the first mounting plate. The radial cutter is installed on the first mounting plate, and a positioning mounting baffle is installed on the edge of the first mounting plate. The positioning assembly is connected to the positioning mounting baffle; the axial tube planing structure includes a semicircular positioning plate and an axial cutter. The diameter of the semicircular positioning plate is adapted to the outer diameter of the inner tube of the sample tube. Two axial cutters are provided, and the two axial cutters are installed at both ends of the semicircular positioning plate.

[0009] The above-mentioned large-diameter sediment sampler on-site sampling operation device, the positioning assembly includes a steel belt correction track, a fixed rod, a pulley, and a connecting rod. Two fixed rods are provided, and one end of the two fixed rods is connected to the positioning mounting baffle. Two connecting rods are installed on one of the fixed rods, and the distance between the two connecting rods is adapted to the width of the steel belt correction track. A pulley is provided at the contact position between the connecting rod and the steel belt correction track.

[0010] In the above-mentioned large-caliber sediment sampler on-site sampling operation device, the anti-slip fixing plate and the sampling tube fixing sleeve are both provided with limiting slot-shaped holes, and the limiting slot-shaped holes are elliptical waist-shaped holes.

[0011] The above-mentioned large-diameter sediment sampler on-site sampling operation device, the anti-slip fixing plate and the sampling tube fixing sleeve are both semicircular structures, the anti-slip fixing plate is installed at the sampling tube joint, and a sampling tube connecting sleeve is provided on the base corresponding to the opposite side of the sampling fixing sleeve. The height of the sampling tube connecting sleeve is lower than the height of the sampling tube fixing sleeve, and the height difference between the sampling tube connecting sleeve and the sampling tube fixing sleeve is the height of the anti-slip fixing plate, and the ejection structure and the anti-slip structure cooperate with each other to wrap the sampling tube joint.

[0012] The above-mentioned large-diameter sediment sampler on-site sampling operation device, the driving module includes a driving shaft, a gear set, and a linear motion transmission mechanism. The linear motion transmission mechanism is fixedly connected to one end of the plug plate to drive the plug plate to move back and forth. The gear set includes a driving gear and a driven gear. The driving gear is meshed with the driven gear. The diameter of the driving gear is smaller than the diameter of the driven gear. The driving shaft is fixedly connected to the central axis of the driving gear, and the central axis of the driven gear is fixedly connected to the linear motion transmission mechanism.

[0013] The above-mentioned large-caliber sediment sampler on-site sampling operation device, the bracket includes a sample tube bracket and a sampling tube bracket, the sample tube bracket is provided with a pulley, and the sampling tube installed with a sampling tube ejection module is placed on the sampling tube bracket.

[0014] The on-site sampling operation method of the large-diameter sediment sampler uses the on-site sampling operation device of the large-diameter sediment sampler as described above, specifically comprising:

[0015] Step 1, lifting the sampling tube: Assess the sample situation in the uppermost sampling tube, use the lifting structure to fix it at the sampling tube joint, pull up the sampling tube by one sampling tube length through the A-frame main cable on the ship, and clamp the lower end of the next sampling tube joint on the working platform;

[0016] Step 2: If there is no sample in the top sampling tube, remove the bolts of the upper and lower sampling tube joints, and use the auxiliary crane / folding arm crane connected to the branch steel cable to lift the top sampling tube without sample to the spare area, and check whether there is a sample in the next sampling tube. If there is no sample, repeat steps 1-2. If there is a sample, proceed to step 3.

[0017] Step 3: Sample anti-dropping and transfer: Remove the semicircular connecting plate at the interface of the sampling tube, install the anti-dropping structure, and drive the plug-in plate of the driving module to insert into the gap of the sampling tube to split the sample, separate the sampling tube from the sample in the lower section of the sampling tube, and remove the connecting bolts to completely disconnect the upper and lower tubes;

[0018] Step 4: The hoisting structure hoists the sampling tube with the anti-dropout structure installed onto the sampling tube bracket, installs the ejection structure at the sampling tube interface, adjusts the ejection plate position so that the ejection plate fits the anti-dropout structure insert plate, drives the insert plate backward with the hydraulic drive, aligns the ejection plate with the positioning notch at the lower tube mouth of the sample tube, slowly ejects the sample tube, and seals the tube end with a tube cap;

[0019] Step 5: Raise the sample tube to a suitable height, use the tube planing mechanism to divide the sample into multiple sections, and plan each section of the sample tube into two halves longitudinally to transport the sample;

[0020] Step 6: Repeat steps 1-5 until all samples in the sampling tubes are taken out.

[0021] The beneficial effect of the present invention is that the above operation process method can well solve the lifting, anti-falling, ejection and sample separation operations in the large-caliber vertical retractable sediment sampling process, ensure the sample quality, facilitate sample transportation, facilitate subsequent sample analysis, greatly improve the sampling efficiency, and ensure the integrity and authenticity of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1 This is a schematic diagram of the installation structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the anti-slip structure of the present invention;

[0025] Figure 3 This is a side view of the anti-slip structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the ejection structure of the present invention;

[0027] Figure 5 This is a cross-sectional view of the ejection structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the installation of the ejection structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the radial pipe planing structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the installation of the radial pipe planing structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the axial pipe planing structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the hoisting structure of the present invention;

[0033] Figure 11 It is a flow chart of the operating method of the present invention;

[0034] Figure 12 This is a flow chart of lifting the sampling tube of the present invention;

[0035] Figure 13 This is a flow chart of the sample anti-transfer process of the present invention;

[0036] Figure 14 This is a sample ejection flow chart of the present invention;

[0037] Figure 15 This is a flow chart of sample separation of the present invention.

[0038] In the figure, 1. sampling tube, 2. anti-slip structure, 2-1. anti-slip fixing plate, 2-2. plug-in plate, 2-3. plug-in plate guide plate, 2-4. axle, 2-5. first limiting slot hole, 2-6. groove, 2-7. lead screw, 2-8. threaded sleeve, 2-9. gear set, 2-10. fixing bolt hole, 3. ejection structure, 3-1. sampling tube ejection module, 3-2. sampling tube fixing sleeve, 3-3. sample tube positioning plate, 3-4. guide pulley, 3-5. sample tube bracket, 3-6. sampling tube bracket, 3-7. oil cylinder telescopic rod, 3-8. sampling Pipe connecting sleeve, 3-9. Second limiting slot hole, 3-10. Base, 3-11. Ejector plate, 4. Sample tube, 5. Lifting fixing plate, 6. Lifting ear, 7. Lifting tension pin, 8. Main steel cable, 9. Branch steel cable, 10. Radial cutter, 11. Positioning installation baffle, 12. Radial sliding wheel, 13. First mounting plate, 14. Second mounting plate, 15. Third mounting plate, 16. Steel belt correction track, 17. Fixed rod, 18. Connecting rod, 19. Pulley, 20. Semicircular positioning plate, 21. Axial cutter, 22. Axial sliding wheel. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, this embodiment discloses a large-caliber sediment sampler field sampling operation device, including an anti-slip structure 2 and an ejection structure 3, which are installed at the joint of the sampling tube 1. Figure 2-3 As shown, it includes an anti-slip fixing plate 2-1, a plug-in plate guide plate 2-3, a plug-in plate 2-2, and a driving module. The driving module is installed in the plug-in plate guide plate 2-3. The driving shaft of the driving module extends to one side of the plug-in plate guide plate and is fixedly connected to the wheel axle 2-4. The plug-in plate is located in the plug-in plate guide plate and is driven to move back and forth by the driving module. The plug-in plate guide plate is fixedly provided with an anti-slip fixing plate 2-1 on the side away from the driving shaft, and the anti-slip fixing plate is provided with a groove 2-6 for the plug-in plate to pass through.

[0041] The driving module includes a driving shaft, a gear set 2-9, and a linear motion transmission mechanism. The linear motion transmission mechanism is fixedly connected to one end of the plug-in plate 2-2, driving the plug-in plate to move back and forth. The gear set includes a driving gear and a driven gear. The driving gear is meshed with the driven gear. The diameter of the driving gear is smaller than the diameter of the driven gear. The driving shaft is fixedly connected to the central axis of the driving gear, and the central axis of the driven gear is fixedly connected to the linear motion transmission mechanism.

[0042] In this embodiment, the linear motion transmission mechanism is a screw and sleeve matching structure, including a screw 2-7 and a sleeve 2-8. One end of the screw 2-7 is fixedly connected to the central axis of the driven gear. The sleeve 2-8 is sleeved on the screw and can move back and forth along the screw. The sleeve is fixedly connected to one end of the insert plate.

[0043] The purpose of the linear motion transmission mechanism is to convert the rotational motion of the wheel shaft into linear motion, thereby driving the inserting plate to move forward and backward. All structures that can achieve this purpose fall within the scope of protection of the present invention.

[0044] like Figure 4-6 As shown, the ejection structure includes a sampling tube ejection module 3-1 and a bracket. The sampling tube ejection module 3-1 includes a sampling tube fixing sleeve 3-2, a cylinder, and an ejection plate. A base 3-10 is provided below the sampling tube fixing sleeve 3-2. A through hole is provided in the middle of the base 3-10. The cylinder telescopic rod 3-7 passes through the through hole and is connected to the ejection plate 3-11. A sample tube positioning plate 3-3 is fixedly provided above the ejection plate 3-11. The sampling tube fixing sleeve is installed at the sampling tube joint when working, and the sampling tube installed with the sampling tube ejection module is placed on the bracket.

[0045] The bracket includes a sample tube bracket 3-5 and a sampling tube bracket 3-6. The sample tube bracket 3-5 is provided with a guide pulley 3-4. The sampling tube 1 installed with the sampling tube ejection module is placed on the sampling tube bracket 3-6. In this embodiment, the length of the sample tube bracket and the sampling tube bracket is not less than the length of the sampling tube 1, ensuring that after the sampling tube ejection module ejects the sample tube 4 and the sample from the sampling tube 1, the sample tube 4 can fall on the sample tube bracket, avoiding the sample tube from falling from the bracket after being ejected, resulting in damage to the sample and the sample tube. In this embodiment, the connection between the sample tube bracket and the sampling tube bracket is not fixed, and can be designed as an integrated structure or can be detachably connected by bolts. The integrated design structure is more secure, and the detachable connection is convenient for storage and transportation.

[0046] In this embodiment, a first limiting slot-shaped hole 2-5 is provided on the anti-slip fixing plate, and a second limiting slot-shaped hole 3-9 is provided on the sampling tube fixing sleeve. Both the first limiting slot-shaped hole 2-5 and the second limiting slot-shaped hole 3-9 are elliptical waist-shaped holes. A fixing bolt hole 2-10 is provided on the anti-slip fixing plate corresponding to the first limiting slot-shaped hole 2-5.

[0047] The anti-slip fixing plate and the sampling tube fixing sleeve are both semicircular structures. The anti-slip fixing plate is installed at the sampling tube joint. The sampling tube connecting sleeve 3-8 is provided on the base corresponding to the opposite side of the sampling tube fixing sleeve. The height of the sampling tube connecting sleeve is lower than the height of the sampling tube fixing sleeve. The height difference between the sampling tube connecting sleeve and the sampling tube fixing sleeve is the height of the anti-slip fixing plate. The ejection structure and the anti-slip structure cooperate with each other to wrap the sampling tube joint. Figure 1 shown.

[0048] like Figure 10 As shown, the on-site sampling operation device includes a lifting structure, which is used to lift the sampler recovered on board. The lifting structure includes a main steel cable 8, a branch steel cable 9, a lifting tension pin 7, a lifting lug 6, and a lifting fixing plate 5. A lifting lug 6 is provided in the middle position above the lifting fixing plate 5. The main steel cable 8 and the branch steel cable 9 are installed at the lifting lug through the lifting tension pin. The main steel cable is connected to the A-frame main cable on the ship, and the branch steel cable is connected to the auxiliary crane / folding arm crane.

[0049] like Figure 7 As shown, the on-site sampling operation device includes a pipe-shaving structure, which includes a radial pipe-shaving structure and an axial pipe-shaving structure. The radial pipe-shaving structure includes a radial mounting plate, a radial cutter 10, a positioning mounting baffle 11, and a positioning assembly. The radial mounting plate includes a first mounting plate 13 located in the center, a second mounting plate 14, and a third mounting plate 15 mounted on either side of the first mounting plate 13. Radial sliding wheels 12 are provided on both sides of the first mounting plate at the connection with the second and third mounting plates. Positioning line observation holes are provided on the second and third mounting plates to facilitate positioning of the radial pipe-shaving structure. The radial cutter is mounted on the first mounting plate, and the positioning mounting baffle 11 is installed on the edge of the first mounting plate. The positioning assembly is connected to the positioning mounting baffle.

[0050] like Figure 8 As shown, the positioning assembly includes a steel belt correction track 16, a fixed rod 17, a pulley 19, and a connecting rod 18. Two fixed rods 17 are provided, and one end of the two fixed rods 17 is connected to the positioning mounting baffle. Two connecting rods 18 are installed on one fixed rod. The distance between the two connecting rods 18 is adapted to the width of the steel belt correction track. A pulley 19 is provided at the contact position between the connecting rod and the steel belt correction track.

[0051] like Figure 9 As shown, the axial tube planing structure includes a semicircular positioning plate 20 and an axial cutter 21. The diameter of the semicircular positioning plate is adapted to the inner and outer diameters of the sample tubes. Two axial cutters 21 are installed, mounted at either end of the semicircular positioning plate. The semicircular positioning plate 20 is composed of multiple square positioning plates. In this embodiment, it consists of three positioning plates. Axial sliding wheels 22 are installed at the junctions of adjacent square positioning plates. To facilitate the fixing of the cutters, handles are provided on the second and third mounting plates and the semicircular positioning plate.

[0052] Based on the above-mentioned on-site sampling equipment, this embodiment also discloses an on-site sampling operation method of a large-caliber sediment sampler, such as Figure 11 As shown, specifically including:

[0053] Step 1: Lift the sampling tube as follows Figure 12Specifically, during vertical sampling and recovery, because the sampling tubes contain samples, the combined weight of the tubes and cutter heads far exceeds the lifting capacity of the ship's auxiliary crane / knuckle boom crane. Before lifting, the sample content of the topmost sampling tube is ascertained. The lifting structure is then secured to the sampling tube joint. The sampling tube is then pulled up one full length via the ship's A-frame main cable. The work platform then clamps the lower end of the next sampling tube's joint. At this point, the primary weight is borne by the platform's clamping mechanism, securing it securely.

[0054] Step 2: If there is no sample in the uppermost sampling tube, remove the bolts of the upper and lower sampling tube joints, and use the auxiliary crane / folding arm crane connected by the branch steel cable to lift the uppermost sampling tube without sample to the spare area, and find out whether there is a sample in the next sampling tube. If there is no sample, repeat steps 1-2. If there is a sample, observe whether the sample in the uppermost sampling tube is full. If it is full, plug one end of the uppermost sample tube with a blocking end plug; if it is not full, pump out water first, and plug one end of the uppermost sample tube with a blocking inner plug. The blocking inner plug structure is as shown in the application number 202311022544.3 A high-efficiency vertical retractable columnar sediment sampler and sampling method Figure 4 After processing the uppermost sampling tube with the sample, proceed to step 3.

[0055] Step 3: Sample anti-transfer Figure 13 As shown, specifically: remove the semicircular connecting plate at the sampling tube interface, install the anti-slip structure, wherein the bolts of the first limit slot hole 2-5 are not tightened to retain the sliding gap, the bolts at the fixing bolt hole 2-10 are tightened, and the upper bolts of the other semicircular connecting plate are removed to release the upper and lower sampling tubes from their fixed relationship. Use the main steel cable to slowly pull the upper sampling tube to the upper limit of the first limit slot hole 2-5, tighten the bolts at the first limit slot hole 2-5, and now there is a gap between the upper and lower sampling tubes for inserting the plate. The drive module drives the plate to insert the gap between the sampling tubes to split the sample. Since the gap is narrow, it can ensure that the sample will not slip out. Loosen the two bolts at the fixing bolt hole 2-10 to leave a movable gap, and then use the drive module to move the plate towards the gap between the two sampling tubes, and the middle sample is split at the end. At this time, remove the bolts at the fixing bolt hole 2-10 of the anti-slip device, and the upper and lower sampling tubes are completely disconnected, separating the sampling tube from the lower section of the sampling tube.

[0056] Step 4: Sample ejection process Figure 14 As shown, specifically: the main steel cable is slowly loosened and the sampling tube with the anti-slip structure is hoisted onto the sampling tube bracket with the force of the branch steel cable. The ejection structure is installed at the sampling tube interface, and the position of the ejection plate is adjusted so that the ejection plate fits the anti-slip structure plug-in plate. The drive module drives the plug-in plate to retreat, and the hydraulic drive ejection plate is aligned with the positioning notch of the lower pipe mouth of the sample tube. The sample tube is slowly ejected, and the tube end is sealed with a pipe cap.

[0057] Step 5, the sample separation process is as follows Figure 15 As shown, specifically: the sample tube is raised to an appropriate height, the sample is divided into multiple sections using a radial tube planing structure, and each section of the sample tube is longitudinally planed into two halves using an axial tube planing structure to transport the sample.

[0058] Step 6: Repeat steps 1-5 until all samples in the sampling tubes are taken out.

[0059] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. Large-caliber sediment sampler on-site sampling operation device, characterized in that: It includes an anti-slip structure and an ejection structure. The anti-slip structure includes an anti-slip fixing plate, a plug-in plate guide plate, a plug-in plate, and a driving module. The driving module is installed in the plug-in plate guide plate. The driving shaft of the driving module extends to one side of the plug-in plate guide plate and is fixedly connected to the wheel axle. The plug-in plate is located in the plug-in plate guide plate and is driven to move back and forth by the driving module. The plug-in plate guide plate is fixedly provided with an anti-slip fixing plate on the side away from the driving shaft. The anti-slip fixing plate is provided with a groove for the plug-in plate to pass through. The ejection structure includes a sampling tube ejection module and a bracket. The sampling tube ejection module includes a sampling tube fixing sleeve, a cylinder, and an ejection plate. A base is provided below the sampling tube fixing sleeve, a through hole is provided in the middle of the base, the cylinder telescopic rod passes through the through hole and is connected to the ejection plate, a sample tube positioning plate is fixedly provided above the ejection plate, the sampling tube fixing sleeve is installed at the sampling tube joint during operation, and the sampling tube installed with the sampling tube ejection module is placed on the bracket.

2. The large-diameter sediment sampler on-site sampling operation device according to claim 1 is characterized in that: It also includes a lifting structure, which is used to lift multiple connected sampling tubes recovered on board. The lifting structure includes a main steel cable, a branch steel cable, a lifting tension pin, a lifting lug, and a lifting fixing plate. A lifting lug is provided in the middle position above the lifting fixing plate. The main steel cable and the branch steel cable are installed at the lifting lug through the lifting tension pin. The main steel cable is connected to the A-frame main cable on the ship, and the branch steel cable is connected to the auxiliary crane / folding arm crane.

3. The large-diameter sediment sampler on-site sampling operation device according to claim 1 is characterized in that: It also includes a tube planing structure, which includes a radial tube planing structure and an axial tube planing structure. The radial tube planing structure includes a radial mounting plate, a radial cutter, a positioning mounting baffle, and a positioning assembly. The radial mounting plate includes a first mounting plate located in the middle, a second mounting plate and a third mounting plate installed on both sides of the first mounting plate. The radial cutter is installed on the first mounting plate, and a positioning mounting baffle is installed on the edge of the first mounting plate. The positioning assembly is connected to the positioning mounting baffle; the axial tube planing structure includes a semicircular positioning plate and an axial cutter. The diameter of the semicircular positioning plate is adapted to the outer diameter of the inner tube of the sample tube. Two axial cutters are provided, and the two axial cutters are installed at both ends of the semicircular positioning plate.

4. The large-diameter sediment sampler on-site sampling operation device according to claim 3 is characterized in that: The positioning assembly includes a steel belt correction track, a fixed rod, a pulley, and a connecting rod. Two fixed rods are provided, and one end of each of the two fixed rods is connected to the positioning mounting baffle. Two connecting rods are installed on one of the fixed rods. The distance between the two connecting rods is adapted to the width of the steel belt correction track. A pulley is provided at the contact position between the connecting rod and the steel belt correction track.

5. The large-caliber sediment sampler on-site sampling operation device according to claim 1, characterized in that: The anti-slip fixing plate and the sampling tube fixing sleeve are both provided with limiting slot-shaped holes, and the limiting slot-shaped holes are elliptical waist-shaped holes.

6. The large-caliber sediment sampler on-site sampling operation device according to claim 1, characterized in that: The anti-slip fixing plate and the sampling tube fixing sleeve are both semicircular structures. The anti-slip fixing plate is installed at the sampling tube joint. A sampling tube connecting sleeve is provided on the base corresponding to the opposite side of the sampling tube fixing sleeve. The height of the sampling tube connecting sleeve is lower than the height of the sampling tube fixing sleeve. The height difference between the sampling tube connecting sleeve and the sampling tube fixing sleeve is the height of the anti-slip fixing plate. The ejection structure and the anti-slip structure cooperate with each other to wrap the sampling tube joint.

7. The large-diameter sediment sampler on-site sampling operation device according to claim 1, characterized in that: The driving module includes a driving shaft, a gear set, and a linear motion transmission mechanism. The linear motion transmission mechanism is fixedly connected to one end of the plugging plate to drive the plugging plate to move back and forth. The gear set includes a driving gear and a driven gear. The driving gear is meshed with the driven gear. The diameter of the driving gear is smaller than that of the driven gear. The driving shaft is fixedly connected to the central axis of the driving gear, and the central axis of the driven gear is fixedly connected to the linear motion transmission mechanism.

8. The large-diameter sediment sampler on-site sampling operation device according to claim 1, characterized in that: The bracket comprises a sample tube bracket and a sampling tube bracket. The sample tube bracket is provided with a pulley. The sampling tube installed with a sampling tube ejection module is placed on the sampling tube bracket.

9. On-site sampling method using a large-caliber sediment sampler, characterized in that: The on-site sampling operation device using the large-diameter sediment sampler according to any one of claims 1 to 8 specifically comprises: Step 1, lifting the sampling tube: Assess the sample situation in the uppermost sampling tube, use the lifting structure to fix it at the sampling tube joint, pull up the sampling tube by one sampling tube length through the A-frame main cable on the ship, and clamp the lower end of the next sampling tube joint on the working platform; Step 2: If there is no sample in the top sampling tube, remove the bolts of the upper and lower sampling tube joints, and use the auxiliary crane / folding arm crane connected to the branch steel cable to lift the top sampling tube without sample to the spare area, and check whether there is a sample in the next sampling tube. If there is no sample, repeat steps 1-2. If there is a sample, proceed to step 3. Step 3: Sample anti-dropping and transfer: Remove the semicircular connecting plate at the sampling tube interface, install the anti-dropping structure, and drive the plug-in plate of the driving module to insert into the gap of the sampling tube to split the sample and separate the sampling tube from the next section of the sampling tube; Step 4: The hoisting structure hoists the sampling tube with the anti-dropout structure installed onto the sampling tube bracket, installs the ejection structure at the sampling tube interface, adjusts the ejection plate position so that the ejection plate fits the anti-dropout structure insert plate, drives the insert plate backward with the hydraulic drive, aligns the ejection plate with the positioning notch at the lower tube mouth of the sample tube, slowly ejects the sample tube, and seals the tube end with a tube cap; Step 5: Raise the sample tube to a suitable height, use the tube planing mechanism to divide the sample into multiple sections, and plan each section of the sample tube into two halves longitudinally as needed to transport the sample; Step 6: Repeat steps 1-5 until all samples in the sampling tubes are taken out.

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