Sampling device for seabed sediments

Abstract

The utility model relates to a sampling device for seabed sediments. The sampling device comprises a fixing frame, a collecting mechanism and a propelling mechanism, the sampling pipe is vertically and movably mounted on the fixed frame; the collecting mechanism is in downward contact with the protective sleeve and drives the protective sleeve to move downwards in the descending process; the cylindrical tool bit is limited in an inner ring surrounded by the plurality of elastic sheet petals in a relatively sliding manner so as to open the elastic sheet petals; after the cylindrical tool bit is separated from the elastic sheet petals in the relative upward moving process of the collecting mechanism, the elastic sheet petals elastically contract to cover the opening of the sampling tube, so that the problems that sediments are easily disturbed to be damaged and easily slide out of the sampling tube to leak during sampling of an existing sampling device are solved.

Description

Technical Field

[0001] The utility model relates to the field of sampling devices, in particular to a sampling device for seabed sediments. Background Art

[0002] The study of seafloor sediments not only provides data for geophysical research, marine oil and gas exploration, and extraction, but also helps understand the impact of greenhouse gas emissions on global warming. The accuracy of research results depends primarily on the in-situ fidelity of the collected samples. Therefore, it is important to accurately maintain the original state of the collected samples and ensure that the sediments are not disturbed during the collection process. Furthermore, seafloor sediments are mostly silt deposits and other materials with a certain consistency. When the sampling tube is separated from the seabed, the sediments are extremely likely to fall outside the sampling tube. Utility Model Content

[0003] The purpose of the utility model is to provide a sampling device for seabed sediments, in which the cylindrical cutter head and the shrapnel petals are detachably connected to prevent large disturbances and sample leakage after the sampling is completed, and ensure that the sediment collected from the seabed surface will not be disturbed during the collection process. The shrapnel petals cover the opening of the sampling tube to ensure that the sediment will not slip out of the sampling tube.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A sampling device for seabed sediments, comprising: a fixing frame, a collecting mechanism and a propulsion mechanism;

[0006] The collection mechanism includes: a sampling tube and a petal-shaped cutter;

[0007] The sampling tube is movably mounted on the fixing frame; the petal-shaped cutter is provided with shrapnel petals and a shrapnel cylinder; a plurality of shrapnel petals are mounted around the shrapnel cylinder, and the plurality of shrapnel petals elastically contract toward the surrounding inner ring; the lower end of the sampling tube is connected to the shrapnel cylinder;

[0008] The propulsion mechanism includes: a protective sleeve, a support rod and a cylindrical cutter head;

[0009] The protective cover is movably mounted on the outside of the collecting mechanism; the collecting mechanism contacts the protective cover downward and drives the protective cover to move downward during the descent process; the support rod is limited in lifting and the support rod is connected to the protective cover; the collecting mechanism or the protective cover contacts the cylindrical cutter head downward, and the cylindrical cutter head is relatively slidably limited to the inner circle surrounded by a plurality of elastic petals to open the elastic petals; after the cylindrical cutter head is separated from the elastic petals during the relative upward movement of the collecting mechanism, the elastic petals elastically shrink to cover the opening of the sampling tube.

[0010] It can be optimized to further include: a pressure maintaining mechanism;

[0011] The pressure-maintaining mechanism includes: a pressure-maintaining end cover;

[0012] After the sampling tube rises and is separated from the protective cover, the pressure-maintaining end cover is installed on the lower end of the collection mechanism, and the pressure-maintaining end cover covers the opening at the lower end of the sampling tube.

[0013] Optimally, the collecting mechanism drives the top of the protective sleeve to descend to a level lower than the plane where the pressure-maintaining end cover is located;

[0014] The pressure-maintaining mechanism includes: a pressure-maintaining moving driver;

[0015] The output end of the pressure-maintaining movement driver is connected to the pressure-maintaining end cover, and is used to drive the pressure-maintaining end cover to move horizontally, so that the pressure-maintaining end cover moves horizontally to vertically align with the lower end of the collecting mechanism, and the lower end of the collecting mechanism descends to be installed on the pressure-maintaining end cover.

[0016] Optimally, the fixing bracket is provided with a guide hole; the top end of the support rod is lowered to a plane below the pressure-maintaining end cover, and the part of the support rod below the top end is linearly raised and lowered in the guide hole, and the guide hole extends along the lifting direction of the sampling tube.

[0017] Optimally, the pressure-maintaining end cover is provided with a stop valve connected to the sampling tube;

[0018] The plurality of shrapnel petals lean against the surrounding inner ring to form a feed inlet; the stop valve is located at the feed inlet.

[0019] Optimally, the sampling tube is provided with a reversing valve, and one output end of the reversing valve is connected to the input end of the one-way valve.

[0020] Optimally, the inner wall of the protective cover is attached to the outer wall of the sampling tube, and the sampling tube moves past the end of the protective cover.

[0021] Preferably, the fixing frame is provided with a positioning hole; the support rod is raised and lowered in the positioning hole, and the support rod is provided with a one-way clamping block;

[0022] The one-way clamping block descends until its lower end abuts against the top of the positioning hole to limit the downward movement of the protective cover; the one-way clamping block passes through the positioning hole after being pressed downward;

[0023] The upper end of the one-way clamping block abuts against the lower side of the positioning hole to limit the upward movement of the protective cover.

[0024] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0025] The present invention provides a sampling device for seabed sediments, in which the cylindrical cutter head and the shrapnel petals are detachably connected, which can prevent the occurrence of large disturbances and easy leakage of samples after the sampling is completed, and can ensure that the sediments collected from the seabed surface will not be disturbed during the collection process. The shrapnel petals cover the opening of the sampling tube to ensure that the sediments will not slip out of the sampling tube, thus solving the problem that the sediments of the existing sampling devices are easily disturbed and damaged and easily leaked during sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of one embodiment of the sampling device;

[0027] Figure 2 It is a schematic cross-sectional view of one embodiment of the assembly of the collecting mechanism and the propulsion mechanism;

[0028] Figure 3 It is a structural diagram of one embodiment of the assembly of the collection mechanism and the propulsion mechanism;

[0029] Figure 4 yes Figure 1 A magnified schematic diagram of the middle part;

[0030] Figure 5 yes Figure 2 Enlarged schematic diagram of middle part B;

[0031] Figure 6 yes Figure 2 Enlarged schematic diagram of middle C part;

[0032] Figure 7 It is a structural schematic diagram of one embodiment of the sampling device;

[0033] Figure 8 This is a structural diagram of one embodiment of a one-way clamping block positioning a support rod;

[0034] Figure 9 This is a structural diagram of one embodiment in which the shrapnel cylinder is installed on the shrapnel petals;

[0035] Figure 10 It is a structural schematic diagram of one embodiment when the shrapnel cylinder is separated from the shrapnel petals;

[0036] Figure 11 It is a structural schematic diagram of one embodiment when the pressure-maintaining end cover is connected to the lower end of the collection mechanism. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", "inner end", "outer end", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without distinction of order or importance. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0039] like Figure 1-11 , a sampling device for seabed sediments, comprising: a fixing frame 1, a collecting mechanism 2 and a propulsion mechanism 3;

[0040] The collection mechanism 2 includes: a sampling tube 21 and a petal-shaped cutter 22;

[0041] The sampling tube 21 is mounted on the fixing frame 1 in a manner so as to be movable in a lifting manner. The petal-shaped cutter 22 includes a spring petal 221 and a spring cylinder 222. A plurality of spring petals 221 are mounted around the spring cylinder 222, and the plurality of spring petals 221 elastically contract toward the surrounding inner ring. The lower end of the sampling tube 21 is connected to the spring cylinder 222.

[0042] The propulsion mechanism 3 includes: a protective sleeve 31, a support rod 32 and a cylindrical cutter head 33;

[0043] The protective cover 31 is movably mounted on the outside of the collecting mechanism 2; the collecting mechanism 2 contacts the protective cover 31 downward and drives the protective cover 31 to move downward during the descent process; the support rod 32 is limited in lifting and lowering, and the support rod 32 is connected to the protective cover 31; the collecting mechanism 2 or the protective cover 31 contacts the cylindrical cutter head 33 downward, and the cylindrical cutter head 33 is relatively slidably limited to the inner circle surrounded by multiple shrapnel petals 221 to open the shrapnel petals 221; after the cylindrical cutter head 33 is separated from the shrapnel petals 221 during the relative upward movement of the collecting mechanism 2, the shrapnel petals 221 elastically shrink to cover the opening of the sampling tube 21.

[0044] The present invention provides a sampling device for seabed sediments, in which the cylindrical cutter head and the shrapnel petals are detachably connected, which can prevent the occurrence of large disturbances and easy leakage of samples after the sampling is completed, and can ensure that the sediments collected from the seabed surface will not be disturbed during the collection process. The shrapnel petals cover the opening of the sampling tube to ensure that the sediments will not slip out of the sampling tube, thus solving the problem that the sediments of the existing sampling devices are easily disturbed and damaged and easily leaked during sampling.

[0045] Specifically, the sampling tube 21 is mounted on the fixed frame 1 in a lifting manner. The sampling tube 21 can be lifted and lowered in a known manner, for example, by a known lifting mechanism such as a combination of an air cylinder, an oil cylinder, a motor and a screw rod, as long as the sampling tube 21 is driven to lift and lower. In the initial state, the lower end of the sampling tube 21 is synchronously connected to the petal-shaped cutter 22, and the cylindrical cutter head 33 is arranged between the multiple shrapnel petals 221 of the petal-shaped cutter 22. The shrapnel petals 221 can elastically contract toward the inner circle formed around them, thereby contacting the outer wall of the cylindrical cutter head 33 under the action of elasticity, and the cylindrical cutter head 33 opens the shrapnel petals 221. At the same time, the protective cover 31 is arranged on the outside of the collection mechanism 2 (for example, the outside of the sampling tube 21), which can provide protection for the collection mechanism 2. Since the support rod 32 is a limited movable When the support rod 32 moves to the end point of the movement, the support rod 32 limits the height position of the protective cover 31, and then limits the descending position of the sampling tube 21 through the support rod 32; when sampling is required, the sampling tube 21 is driven to move downward, and the collection mechanism 2 contacts the protective cover 31 downward, which means that any part of the collection mechanism 2 such as the sampling tube 21 or the petal-shaped cutter 22 contacts any position of the protective cover 31 downward, and the contact position is any structure in the protective cover 31. For example, the protective cover 31 can be provided with a support plate 311, and the sampling tube 21 or the petal-shaped cutter 22 can be provided with a support plate 311. The device 22 contacts the support plate 311 downward, thereby directly or indirectly driving the protective cover 31 to descend synchronously during the descent of the sampling tube 21; the sampling tube 21 or the shrapnel cylinder 222 can directly drive the protective cover 31 to move downward, and the shrapnel petals 221 are attached to the outer side of the cylindrical cutter head 33, which can limit the downward movement direction of the cylindrical cutter head 33, thereby ensuring that the downward movement angle of the cylindrical cutter head 33 does not deviate, so that only one of the sampling tube 21, the shrapnel cylinder 222 and the protective cover 31 can be made to contact the cylindrical cutter head 33 from top to bottom to achieve The cylindrical cutter head 33 is now driven to move downward synchronously, thereby ensuring that the cylindrical cutter head 33 maintains the same angle and extends into the deep sediment. The cylindrical cutter head 33, the protective cover 31 and the sampling tube 21 are sequentially extended into the sediment, and the sediment passes through the area surrounding the cylindrical cutter head 33 and the shrapnel petals 221 and enters the sampling tube 21. When the sampling tube 21 of the present application is fully extended into the sediment, the sediment eventually fills the sampling tube 21. Therefore, it is only necessary to design the sampling tube 21 of the required length and the lifting end point of the support rod 32 to ensure that sufficient seabed sediment is collected.When the sampling is completed, the support rod 32 can be limited, for example, by manual limitation or mechanical structure limitation, to limit the movement of the protective cover 31, and then the sampling tube 21 can be driven to move upward, and the petal-shaped cutter 22 can be driven to move upward; since the collection mechanism 2 only contacts the protective cover 31 downward, the collection mechanism 2 or the protective cover 31 contacts the cylindrical cutter head 33 downward, and the spring petals 221 of the petal-shaped cutter 22 slide upward relative to the cylindrical cutter head 33, and will fall out from the top of the cylindrical cutter head 33, and the cylindrical cutter head 33 is separated from the spring petals 221, and the spring petals 221 are retracted to the inner circle under the action of elasticity. The cylindrical blade 33, protective sleeve 31 and sampling tube 21 are sequentially inserted into the sediment to extend the length of the sampling, which has the advantage of obtaining deep seabed sediments, allowing the sampling interface to be sampled without disturbance, and the combination of the shrapnel petals 221 can support the sediment sample as a whole.

[0046] There are multiple shrapnel petals 221, and the gravity of the sediment is evenly distributed on each shrapnel petal 221, thereby combining the sampling and recovery support that can support large length and large diameter seabed sediments.

[0047] Optimally, it further includes: a pressure maintaining mechanism 4;

[0048] The pressure maintaining mechanism 4 includes: a pressure maintaining end cover 41;

[0049] After the sampling tube 21 rises and is separated from the protective cover 31 , the pressure-maintaining end cover 41 is installed on the lower end of the collection mechanism 2 , and the pressure-maintaining end cover 41 covers the opening at the lower end of the sampling tube 21 .

[0050] After sampling is complete, the sampling tube 21 can be raised and released from the protective sleeve 31. Once the sampling tube 21 is released, the pressure-maintaining end cap 41 in the pressure-maintaining mechanism 4 can be installed at the lower end of the collection mechanism 2, thereby sealing the sampling tube 21 and maintaining the sample in place. The pressure-maintaining end cap 41, installed at the lower end of the collection mechanism 2, can be installed at the lower end of the sampling tube 21 or can be a spring cylinder 222 at the lower end of the sampling tube 21, thereby directly or indirectly covering the opening at the lower end of the sampling tube 21.

[0051] Optimally, the collecting mechanism 2 drives the top of the protective cover 31 to descend to a level lower than the plane where the pressure-maintaining end cover 41 is located;

[0052] The pressure-maintaining mechanism 4 includes: a pressure-maintaining moving driver 42;

[0053] The output end of the pressure-maintaining movement driver 42 is connected to the pressure-maintaining end cover 41, and is used to drive the pressure-maintaining end cover 41 to move horizontally, so that the pressure-maintaining end cover 41 moves horizontally to vertically align with the lower end of the collection mechanism 2, and the lower end of the collection mechanism 2 descends to be installed on the pressure-maintaining end cover 41.

[0054] After the collecting mechanism 2 drives the protective cover 31 to descend, the end point of the descent is preferably such that the top of the protective cover 31 is lower than the plane where the pressure-maintaining end cover 41 is located. Figure 7 The advantage of this spatial distribution is that after the collection is completed, the sampling tube 21 only needs to move upward to completely separate from the protective cover 31, and then the pressure-maintaining moving driver 42 is started. The output end of the pressure-maintaining moving driver 42 drives the pressure-maintaining end cover 41 to move horizontally to the lower end of the collection mechanism 2 (for example, the lower end of the sampling tube 21 or the lower end of the shrapnel cylinder 222). The sampling tube 21 only needs to be lowered again to make the collection mechanism 2 lower as a whole. The lower end of the collection mechanism 2 is finally installed on the pressure-maintaining end cover 41, so that the sampling tube 21 or the shrapnel cylinder 222, etc. as the lower end part of the collection mechanism 2 are assembled with the pressure-maintaining end cover 41, and finally the pressure-maintaining end cover 41 is directly or indirectly installed on the lower end of the collection mechanism 2 to seal the lower end opening of the sampling tube 21; in this way, when the collection mechanism 2 drives the protective cover 31 to move downward, the top of the protective cover 31 will be cleared of air. After the sediment collection is completed, the sealing can be maintained in the original position by adjusting the pressure-maintaining end cover 41 horizontally and adjusting the collection mechanism 2 up and down. Furthermore, since the sampling tube 21 only needs to rise and then fall after completing the collection, the rising distance and the falling distance of the sampling tube 21 can be driven by adjusting the sampling lifting driver 5. For example, the rising distance and the falling distance of the cylinder are fixed, and the motor drives the screw to rotate so that the lifting distance of the nut seat is fixed. Therefore, the sampling tube 21 can rise until the lower end of the sampling tube 21 is infinitely close to the upper end of the pressure-maintaining end cover 41, thereby reducing the falling distance of the sampling tube 21, and then shortening the sealing time of the sampling tube 21. The sampling tube 21 can remain sealed in its original position immediately after the collection is completed.

[0055] Furthermore, when the top of the protective sleeve 31 drops to below the plane where the pressure-maintaining end cover 41 is located, and the sampling tube 21 rises again after completing sampling, a relative displacement is formed between the top of the protective sleeve 31 and the outer wall of the sampling tube 21. The top of the protective sleeve 31 can scrape the sediment on the outer wall of the sampling tube 21 to remove the sediment, thereby avoiding subsequent impact on the assembly of the pressure-maintaining end cover 41, and improving the surface cleanliness of the sampling tube 21 and increasing its service life, thereby protecting the outer wall of the sampling tube 21 and preventing contaminants from hanging on the outer wall of the sampling tube 21, thereby solving the problem that the existing solution cannot protect the outer wall of the sampling tube 21.

[0056] Optimally, the fixing frame 1 is provided with a guide hole 11; the top end of the support rod 32 is lowered to a plane below the pressure-maintaining end cover 41, and the part of the support rod 32 below the top end is linearly raised and lowered in the guide hole 11, and the guide hole 11 extends along the lifting direction of the sampling tube 21.

[0057] like Figure 7 , the top end of the support rod 32 can also be lower than the plane of the pressure-maintaining end cover 41 during the descent process, thereby avoiding the horizontal movement of the pressure-maintaining end cover 41 and preventing the top end of the support rod 32 from interfering with the assembly of the pressure-maintaining end cover 41 and the sampling tube 21. The guiding effect of the support rod 32 on the protective cover 31 is mainly concentrated in the part below the top end of the support rod 32. The lower part of the support rod 32 is limited to the guide hole 11. The lower part of the support rod 32 moves along the extension direction of the guide hole 11. The guide hole 11 provides a positioning effect for the support rod 32 to prevent the position of the protective cover 31 from deviating. In this way, the support rod 32 can not only guide the lifting and lowering of the protective cover 31, but also avoid the horizontal movement of the pressure-maintaining end cover 41 during the descent process.

[0058] In this solution, since the support rod 32 is limited in movement, when the support rod 32 moves to the end of the movement, the support rod 32 limits the height position of the protective cover 31. It is only necessary to design the sampling tube 21 of the required length and the lifting end point of the support rod 32 to ensure that sufficient seabed sediment is collected. When the sampling is completed, the support rod 32 can be kept limited in position. For example, in some embodiments, Figure 5 The top of some support rods 32 may be provided with a boss 323. The boss 323 engages above the fixing frame 1 at the end of the support rod 32's downward movement, preventing it from moving further downward. For example, in some embodiments, the top of some support rods 32 may be manually gripped or secured by other mechanical means. This is sufficient as long as the support rod 32 is held in position to limit the height of the protective sleeve 31. In this way, the top position of the support rod 32 is restricted. Even if the protective sleeve remains in the sediment, the support rod 32 and the protective sleeve can still be recovered by driving the top of the support rod 32 upward.

[0059] The limit raising and lowering of the support rod 32 can be determined according to needs. For example, after the collection is completed, the support rod 32 is manually or mechanically held to prevent the protective cover 31 from rising synchronously, thereby keeping the protective cover 31 relatively still and the sampling tube 21 relatively rising, so that there is considerable sliding between the sampling tube 21 and the protective cover 31 for final separation.

[0060] Optimally, the pressure-maintaining end cover 41 is provided with a stop valve 43 connected to the sampling tube 21;

[0061] The plurality of spring petals 221 lean against the surrounding inner ring to form a feed inlet 223 ; the stop valve 43 is located at the feed inlet 223 .

[0062] In addition to sealing the sampling tube 21, the pressure-retaining end cap 41 also allows for the introduction of a specific medium, such as a liquid or gas, into the sampling tube 21 through its shutoff valve 43. This allows for the introduction of gas or liquid during pressure-retaining analysis while sealed, simulating in-situ conditions. Simulating in-situ conditions can reduce or prevent the effects of oxidation and biodegradation on the sediment sample, thereby preserving the sample's original properties. The pressure-retaining end cap 41 can be designed with a transparent material at certain locations, as needed, to facilitate external observation and analysis.

[0063] In some embodiments, the spring petals 221 are sufficient to confine the seabed sediments within the sampling tube 21 , and the sampling tube 21 can be directly removed and then the pressure-maintaining end cap 41 can be installed.

[0064] In the most preferred embodiment, it further comprises: a sampling lifting driver 5;

[0065] The output end of the sampling lifting driver 5 is connected to the sampling tube 21 for lifting and lowering, and is used to drive the sampling tube 21 to move upward and downward;

[0066] After the sampling tube 21 is separated from the protective cover 31 , the sampling lifting driver 5 drives the sampling tube 21 downward until the lower end of the collecting mechanism 2 presses against the pressure-maintaining end cover 41 , and the pressure-maintaining end cover 41 seals and covers the lower end opening of the sampling tube 21 .

[0067] The sampling lift actuator 5 is used to drive the sampling tube 21 up and down. It can drive the sampling tube 21 downward, thereby causing the entire collection mechanism 2 to move, thereby driving the protective sleeve 31, support rod 32, and cylindrical cutter head 33 to descend synchronously. The sampling lift actuator 5 can also drive the sampling tube 21 upward until it is free from the protective sleeve 31, thereby separating the protective sleeve 31 from the sampling tube 21. After the sampling tube 21 is free from the protective sleeve 31, the lower end of the sampling tube 21 can be pressed against the pressure-retaining end cap 41 to enhance the sealing of the sampling tube 21. The location where the pressure-retaining end cap 41 is pressed can be the tube opening at the lower end of the sampling tube 21, or any structure below the tube opening, such as the spring cylinder 222 of the petal-shaped cutter 22. At the same time, the pressure-retaining end cap 41 can be provided with a corresponding sealing structure as needed, such as an O-ring at the pressing position of the collection mechanism 2 to improve the sealing performance.

[0068] More preferably, the sampling lifting driver 5 can be communicatively connected with the pressure-maintaining moving driver 42, and the linkage between the two can quickly respond and shorten the waiting time.

[0069] The sampling lifting driver 5 is a well-known mechanism for driving the lifting movement, such as a combination of an air cylinder, an oil cylinder, a motor and a screw, etc., as long as it can drive the sampling tube 21 to move up and down.

[0070] Optimally, the sampling pipe 21 is provided with a reversing valve 14 , and one output end of the reversing valve 14 is connected to the input end of the one-way valve 13 .

[0071] In some embodiments, during the sediment collection process, to further increase the amount of sediment collected, the reversing valve 14 is switched to connect to the one-way valve 13. The input end of the one-way valve 13 is indirectly connected to the sampling tube 21. In this way, when the seabed sediment is in situ, the one-way valve can unidirectionally discharge seawater, thereby collecting more sediment in the same sampling tube 21, thereby retaining only the majority of the solid sediment. In particular, for embodiments in which the spring petals 221 form the feed port 223, removing moisture can reduce the fluidity of the sediment, so that the spring petals 221 mainly support the solid portion, preventing the liquid from carrying the solid portion away from the feed port 223. Alternatively, a drainage device 6 can be connected to the one-way valve 13. The drainage device 6 uses negative pressure to continuously drain moisture from the sediment. The drainage device 6 is a well-known mechanism with a drainage function, which primarily drains water from the sampling tube 21 through negative pressure. After the sampling device completes sampling, the reversing valve 14 can be closed, thereby completely sealing the sampling tube 21, thereby ensuring accurate, pressure-maintained, interference-free sampling with low water content.

[0072] Optimally, the inner wall of the protective cover is attached to the outer wall of the sampling tube, and the sampling tube moves past the end of the protective cover.

[0073] When the sampling tube 21 moves relative to the protective sleeve 31, the end of the protective sleeve 31 can scrape the sediment on the outer wall of the sampling tube 21 to remove the sediment, thereby preventing it from affecting the subsequent assembly of the pressure-maintaining end cap 41. This can also improve the surface cleanliness of the sampling tube 21 and increase its service life, thereby protecting the outer wall of the sampling tube 21 and preventing contaminants from clinging to the outer wall of the sampling tube 21. This solves the problem that existing solutions cannot protect the outer wall of the sampling tube 21. At the same time, a clean end surface helps to seal the sampling tube 21, thereby improving the subsequent fidelity and pressure-maintaining collection effect.

[0074] Optimally, the fixing frame 1 is provided with a positioning hole 12; the support rod 32 is raised and lowered in the positioning hole 12, and the support rod 32 is provided with a one-way block 321;

[0075] The one-way block 321 descends until its lower end abuts against the top of the positioning hole 12 to limit the downward movement of the protective cover 31 ; the one-way block 321 passes through the positioning hole 12 after being pressed downward;

[0076] The upper end of the one-way block 321 abuts against the bottom of the positioning hole 12 to limit the upward movement of the protective cover 31 .

[0077] like Figure 8 The arrow direction is the descending direction of the support rod 32; the best solution is to set a one-way block 321 on the support rod 32, and the positioning of the protective cover 31 before and after collection can be achieved only by setting the one-way block 321; before collection, the collection mechanism 2 drives the protective cover 31 to move downward, and the one-way block 321 can eventually reach the fixing frame 1, specifically moving to the top of the positioning hole 12, thereby positioning the protective cover 31 for descending, and then positioning the descending end point of the sampling tube 21, and the one-way block 321 can be designed at the height position of the support rod 32 to determine the depth of the sampling tube 21 inserted into the sediment; and after the sampling tube 21 is lowered and positioned or after collection is completed, the support rod 32 can be driven to The cam 321 is moved downwards to allow the one-way block 321 to pass through the positioning hole 12 under the action of pressure, specifically to move to the bottom of the positioning hole 12; after the sampling tube 21 completes the collection, the sampling tube 21 needs to rise until it is finally separated from the protective cover 31, and the upper end of the one-way block 321 provided on the support rod 32 presses upwards against the fixing frame 1, thereby limiting the upward trend of the support rod 32 and ultimately limiting the rise of the protective cover 31; that is, the rise restriction of the support rod 32 in this embodiment can omit additional manual fixation or complex mechanical limit, and only needs to drive the sampling tube 21 to move upward; the one-way block 321 is provided on the support rod 32, so that multi-level positioning of the protective cover 31 before and after collection can be achieved.

[0078] The one-way block 321 is further pressed and then passes through the positioning hole 12. This can be achieved by selecting the material of the one-way block 321 or the structure of the one-way block 321. For example, the one-way block 321 can be made of a material with a certain degree of deformability, such as plastic, rubber, or a thin and elastic metal piece.

[0079] The outer diameter of the upper half of the one-way clamping block 321 gradually increases from the upper end to the lower end.

[0080] When the cam 32 is in the closed position, the cam 32 is in the closed position, and the cam 32 is in the open position, so that the cam 32 is in the closed position, and the cam 32 is in the open position, so that the cam 32 is not in the open position, and the cam 32 is not in the open position, so that the cam 32 is not in the open position, and the cam 32 is in the open position, so that the cam 32 is in the open position, and the cam 32 is in the open position, so that the cam 32 is in the open position, and the cam 32 is in the open position, so that the cam 32 is in the open position, and the cam 32 is in the open position, so that the cam 32 is in the open position,

[0081] It can be further optimized that the distance between the inner wall of the positioning hole 12 and the outer wall of the support rod 32 is smaller than the outer diameter of the upper end of the one-way blocking block 321 .

[0082] The distance between the inner wall of the positioning hole 12 and the outer wall of the support rod 32 is smaller than the outer diameter of the upper end of the one-way block 321; the larger the distance between the inner wall of the positioning hole 12 and the outer wall of the support rod 32, the one-way block 321 can pass through the positioning hole 12 with less pressing force, thereby improving the service life of the support rod 32; in one embodiment, the support rod 32 can be located in the middle of the positioning hole 12; in one embodiment, the support rod 32 can be located in the inner wall of the positioning hole 12, or the support rod 32 is located between the middle and the inner wall of the positioning hole 12.

[0083] A method for sampling seabed sediments comprises the following steps:

[0084] (1) The collecting mechanism 2 moves downward until it contacts the protective sleeve 31, and drives the protective sleeve 31 downward. The collecting mechanism 2 or the protective sleeve 31 moves downward until it contacts the cylindrical cutter head 33. The cylindrical cutter head 33 and the collecting mechanism 2 extend into the sediment below the seabed surface.

[0085] (2) The sediment enters the sampling tube 21 through the cylindrical cutter head 33 until the sediment fills the sampling tube 21, and then the collection mechanism 2 is driven to rise, and the protective cover 31 is kept in position, and the cylindrical cutter head 33 and the spring petals 221 at the lower end of the collection mechanism 2 are gradually separated; when the spring petals 221 shrink toward the inner circle under the action of elasticity to cover the opening of the sampling tube 21, the seabed sediment is cut off, and the sediment is retained in the sampling tube 21;

[0086] (3) Install the pressure-maintaining end cap 41 on the bottom of the collection mechanism 2 to maintain the pressure and seal the sampling tube 21.

[0087] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sampling device for seabed sediments, characterized in that: include: Fixed frame, collection mechanism and propulsion mechanism; The collection mechanism includes: a sampling tube and a petal-shaped cutter; The sampling tube is movably mounted on the fixing frame; the petal-shaped cutter is provided with shrapnel petals and a shrapnel cylinder; a plurality of shrapnel petals are mounted around the shrapnel cylinder, and the plurality of shrapnel petals elastically contract toward the surrounding inner ring; the lower end of the sampling tube is connected to the shrapnel cylinder; The propulsion mechanism includes: a protective sleeve, a support rod and a cylindrical cutter head; The protective cover is movably mounted on the outer side of the collecting mechanism; the collecting mechanism contacts the protective cover downward and drives the protective cover to move downward during the descent process; the support rod is limited and raised, and the support rod is connected to the protective cover; the collecting mechanism or the protective cover contacts the cylindrical cutter head downward, and the cylindrical cutter head is relatively slidably limited to the inner circle surrounded by the multiple elastic petals to open the elastic petals; after the cylindrical cutter head is separated from the elastic petals during the relative upward movement of the collecting mechanism, the elastic petals elastically contract to cover the opening of the sampling tube; The sampling pipe is provided with a reversing valve, one of the output ends of the reversing valve is connected to the input end of a one-way valve, and the one-way valve is used to discharge seawater; when the reversing valve is switched to connect to the one-way valve, the sampling pipe is connected to the one-way valve; when the reversing valve is switched to close, the sampling pipe is sealed; The inner wall of the protective cover is attached to the outer wall of the sampling tube, and the sampling tube moves past the end of the protective cover; The fixing frame is provided with a positioning hole; the support rod is raised and lowered in the positioning hole, and the support rod is provided with a one-way clamping block; The one-way clamping block descends until its lower end abuts against the top of the positioning hole to limit the downward movement of the protective cover; the one-way clamping block passes through the positioning hole after being pressed downward; The upper end of the one-way clamping block abuts against the lower side of the positioning hole to limit the upward movement of the protective cover.

2. A seabed sediment sampling device according to claim 1, characterized in that: Also includes: Pressure holding mechanism; The pressure-maintaining mechanism includes: a pressure-maintaining end cover; After the sampling tube rises and is separated from the protective cover, the pressure-maintaining end cover is installed on the lower end of the collection mechanism, and the pressure-maintaining end cover covers the opening at the lower end of the sampling tube.

3. A seabed sediment sampling device according to claim 2, characterized in that: The collecting mechanism drives the top of the protective sleeve to descend to a plane lower than the plane where the pressure-maintaining end cover is located; The pressure-maintaining mechanism includes: a pressure-maintaining moving driver; The output end of the pressure-maintaining movement driver is connected to the pressure-maintaining end cover, and is used to drive the pressure-maintaining end cover to move horizontally, so that the pressure-maintaining end cover moves horizontally to vertically align with the lower end of the collecting mechanism, and the lower end of the collecting mechanism descends to be installed on the pressure-maintaining end cover.

4. A seabed sediment sampling device according to claim 3, characterized in that: The fixing frame is provided with a guide hole; the top end of the support rod is lowered to a plane below the pressure-maintaining end cover, and the part of the support rod below the top end is linearly raised and lowered and limited to the guide hole, and the guide hole extends along the lifting direction of the sampling tube.

5. The seabed sediment sampling device according to claim 2, characterized in that: The pressure-maintaining end cover is provided with a stop valve connected to the sampling tube; The plurality of shrapnel petals lean against the surrounding inner ring to form a feed inlet; the stop valve is located at the feed inlet.

6. The seabed sediment sampling device according to claim 1, characterized in that: The outer diameter of the upper half of the one-way clamping block gradually increases from the upper end to the lower end.

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