Sediment Fixed-Period Sampling Device and Method Based on In-Situ Encapsulation and Preservation with Alcohol

Abstract

The present invention discloses a sediment fixed-period sampling device and method based on in-situ encapsulation preservation with alcohol. The sampling device includes an alcohol injection mechanism, a sampling mechanism, a reversing valve mechanism, and a control mechanism. A plurality of sampling units for sediment sampling are provided in the sampling mechanism. The alcohol injection mechanism is connected to the sampling tubes of each sampling unit to provide an alcohol sealing basis for the sampling tubes. The control mechanism is used to control the reversing valve mechanism so that different sampling units are connected to the alcohol injection mechanism, ultimately achieving the effect of sampling and sealing different sampling units in different periods. The sediment fixed-period sampling device and method based on in-situ encapsulation preservation with alcohol proposed by the present invention solve the problems of small number of samples, high cost, and large differences in multiple sediment samplings. By using alcohol injection for in-situ sealing, it can provide a reference basis for the research on the sediment fixed-period sampling method.

Description

Technical Field

[0001] The present invention relates to the technical field of sediment sampling, and in particular to a device and method for periodically sampling sediment with in-situ alcohol encapsulation and preservation. Background Art

[0002] To study the impact of the resedimentation of plumes in deep-sea mining areas on the bottom environment and organisms, the in-situ characteristics of long-term time-series sediments are of great significance. Currently, common sediment sampling devices can only achieve short-term sampling. Multiple samplings are costly, with small quantities and large differences. The main reasons are that the cost of ocean voyages is high and it is difficult for equipment to operate on the seabed for a long time.

[0003] Currently, there is no suitable device or method that can obtain sediment samples with long-term time-series sampling and in-situ alcohol encapsulation and preservation. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for periodically sampling sediment with in-situ alcohol encapsulation and preservation, so as to solve the problems existing in the above-mentioned prior art, and can provide a reference basis for the research on periodic sediment sampling.

[0005] To achieve the above purpose, the present invention provides the following solution: The present invention provides a device for periodically sampling sediment with in-situ alcohol encapsulation and preservation, including

[0006] an alcohol injection mechanism, the alcohol injection mechanism includes a lead screw motor 1, an alcohol tank body, and a lead screw 1. The lead screw motor 1 is used to drive the lead screw 1 to act. The end of the lead screw 1 passes through the top plate of the alcohol tank body and is located in the alcohol chamber. A piston is installed at the end of the lead screw 1. A liquid is led out from below the alcohol tank body through a PTFE joint; and

[0007] a sampling mechanism, the sampling mechanism includes a sampling body, an oil filling motor, and a plurality of sampling units with the same structure circumferentially distributed on the sampling body. Each sampling unit includes a lead screw motor 2, a sampling tank body, a sampling pipe, and a lead screw 2. The lead screw motor 2 is used to drive the lead screw 2 to act. The end of the lead screw 2 passes through the top plate of the sampling tank body and is hermetically connected to the top of the sampling pipe through a sampling piston. A lid that can be opened or closed is provided at the bottom of the sampling tank body. The sampling pipe is arranged in the cavity of the sampling tank body. A one-way valve and a pipe joint are installed at the bottom of the sampling pipe. An insertion pin hook is installed below the oil filling motor. The oil filling motor is used to drive the insertion pin hook to rotate, and the insertion pin hook is used to control the opening or closing of the lid; and

[0008] A reversing valve mechanism, the reversing valve mechanism includes a reversing valve body, a circumferential PTFE joint, and a lower PTFE joint. A plurality of the circumferential PTFE joints are circumferentially and uniformly distributed on the outer periphery of the reversing valve body. Each of the circumferential PTFE joints is respectively used to connect with the pipe joints on each sampling pipe. The bottom of the reversing valve body is communicated with the lower PTFE joint, and the lower PTFE joint is connected to the PTFE joint through a high-pressure hose; and

[0009] A control mechanism, the control mechanism includes a circuit board and a motor compartment. The circuit board is arranged in the motor compartment, and the motor compartment is installed above the reversing valve body. The circuit board is used to control the reversing of the reversing valve mechanism so that different circumferential PTFE joints are connected or disconnected.

[0010] In one embodiment, the lead screw motor one is hermetically arranged in the motor compartment body, and a watertight connector one is installed on the top of the motor compartment body.

[0011] In one embodiment, the bottom of the motor compartment body is connected to the alcohol compartment body through a plurality of connecting rods, and the plurality of connecting rods are circumferentially and uniformly distributed on the bottom edge of the motor compartment body.

[0012] In one embodiment, the lead screw motor two is hermetically arranged in the motor compartment body, and a watertight connector one is installed on the top of the motor compartment body.

[0013] In one embodiment, the bottom of the motor compartment body is connected to the sampling compartment body through a plurality of connecting rods, and the plurality of connecting rods are circumferentially and uniformly distributed on the bottom edge of the motor compartment body.

[0014] In one embodiment, a pull rope is connected to the inner wall of the sampling compartment body. The pull rope has elasticity, and the other end of the pull rope is connected to the top of the end cover; the bottom of the end cover is connected to a latch through a locking rope; the latch swivel hook is detachably connected to the latch and the locking rope.

[0015] In one embodiment, the circuit board is fixed in the motor compartment through a support ring and a circuit fixing plate. The motor compartment end cover of the motor compartment is connected to the reversing valve body; a plug is arranged on the top of the motor compartment.

[0016] In one embodiment, a pipe joint one is opened on the side wall of the sampling compartment body. One end of the high-pressure hose is connected to the circumferential PTFE joint, and the other end of the high-pressure hose passes through the pipe joint one on the side wall of the sampling compartment body and is connected to the pipe joint at the bottom of the sampling pipe.

[0017] In one embodiment, the oil-filled motor is disposed in an oil-filled motor cabin. Above the oil-filled motor cabin, a watertight connector II and a pipe joint II are installed. The pipe joint II above the oil-filled motor cabin is connected to a hydraulic oil circuit.

[0018] The present invention also provides a method for periodically sampling sediments based on in-situ encapsulation preservation with alcohol, which is applied to the above-mentioned device for periodically sampling sediments based on in-situ encapsulation preservation with alcohol, and includes the following steps:

[0019] (1) Use an external device to place the overall sampling device to a specified depth. At this time, the end caps of multiple sampling tubes are in an open state;

[0020] (2) The sampling unit pushes the sampling piston through the lead screw motor II, and the sampling piston pushes the sampling tube downward to obtain sediment samples;

[0021] (3) After the single-tube sediment sample sampling is completed, control the oil-filled motor to rotate to drive the pin hook to pull out the pin to release the restraint on the locking rope, and the end cap fits the sampling cabin body under the action of the tension rope for sealing;

[0022] (4) After one sampling is completed, control the lead screw motor I to push the piston so that the alcohol in the alcohol chamber sequentially passes through the high-pressure hose, the circumferential PTFE joint, and the pipe joint of the sampling tube and is then injected into the sampling tube;

[0023] (5) After the injection is completed, control the reversing valve mechanism to realize the switching of the alcohol injection pipeline;

[0024] (6) Repeat the above steps (2)-(5) to achieve periodic sampling of sediments based on in-situ encapsulation preservation with alcohol.

[0025] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0026] In the device and method for periodically sampling sediments based on in-situ encapsulation preservation with alcohol in the present invention, the sampling device includes an alcohol injection mechanism, a sampling mechanism, a reversing valve mechanism, and a control mechanism. In the sampling mechanism, multiple sampling units for sediment sampling are provided. The alcohol injection mechanism is connected to the sampling tubes of each sampling unit to provide an alcohol sealing basis for the sampling tubes; the control mechanism is used to control the reversing valve mechanism so that different sampling units are connected to the alcohol injection mechanism, and finally the effect of sampling and sealing different sampling units in different periods is achieved.

[0027] The sediment fixed-period sampling device and method based on in-situ encapsulation and preservation with alcohol proposed by the present invention solve the problems of small number of samples, high cost, and large differences in multiple sediment samplings. By using alcohol injection for in-situ sealing, it can provide a reference basis for the research on sediment fixed-period sampling methods. The present invention provides a sediment fixed-period sampling method, which specifically includes the design of an injection device, the design of a sampling device, and the control of the opening and closing of the oil-filled motor end cover; therefore, it can be used for the design and in-depth research of fixed-period sampling methods for deep-sea in-situ water bodies, microorganisms, sediments, etc. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of the overall structure of the sediment fixed-period sampling device based on in-situ encapsulation and preservation with alcohol in the embodiment of the present invention;

[0030] Figure 2 It is a structural composition diagram of the alcohol injection mechanism;

[0031] Figure 3 It is a structural composition diagram of the control mechanism and the reversing valve mechanism;

[0032] Figure 4 It is a bottom view of the sampling mechanism;

[0033] Figure 5 It is an internal cross-sectional view of the sampling cabin;

[0034] Figure 6 It is a schematic diagram of the structure of the oil-filled motor;

[0035] Among them, 1 is the first lead screw motor; 2 is the alcohol injection mechanism; 3 is the high-pressure hose; 4 is the reversing valve mechanism; 5 is the control mechanism; 6 is the sampling unit; 7 is the one-way valve; 8 is the oil-filled motor; 9 is the second lead screw motor; 10 is the first pipe joint; 11 is the first watertight connector; 12 is the connecting rod; 13 is the first lead screw; 14 is the alcohol chamber; 15 is the PTFE joint; 16 is the piston; 17 is the motor cabin; 18 is the support ring; 19 is the circumferential PTFE joint; 20 is the lower PTFE joint; 21 is the motor cabin end cover; 22 is the circuit fixing plate; 23 is the plug; 24 is the locking rope; 25 is the pin; 26 is the sampling pipe; 27 is the end cover; 28 is the pulling rope; 29 is the sampling piston; 30 is the second watertight connector; 31 is the pin turning hook; 32 is the oil-filled motor cabin; 33 is the second pipe joint. Detailed Embodiments

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] The purpose of the present invention is to provide a device and method for periodic sampling of sediment based on in-situ encapsulation and preservation with alcohol, so as to solve the problems existing in the above-mentioned prior art, and can provide a reference basis for the research of periodic sampling of sediment.

[0038] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] As Figures 1 - 6 shown, the present invention provides a device for periodic sampling of sediment based on in-situ encapsulation and preservation with alcohol, including

[0040] an alcohol injection mechanism 2, the alcohol injection mechanism 2 includes a lead screw motor 1, an alcohol tank body and a lead screw 13. The lead screw motor 1 is used to drive the lead screw 13 to act. The end of the lead screw 13 passes through the top plate of the alcohol tank body and is located in the alcohol chamber 14. A piston 16 is installed at the end of the lead screw 13; a liquid is led out through a PTFE joint 15 below the alcohol tank body; and

[0041] a sampling mechanism, the sampling mechanism includes a sampling body, an oil filling motor 8 and a plurality of sampling units 6 with the same structure circumferentially distributed on the sampling body. The sampling unit 6 includes a lead screw motor 2 9, a sampling tank body, a sampling tube 26 and a lead screw 2. The lead screw motor 2 9 is used to drive the lead screw 2 to act. The end of the lead screw 2 passes through the top plate of the sampling tank body and is hermetically connected to the top of the sampling tube 26 through a sampling piston 29. A bottom cover 27 that can be opened or closed is provided at the bottom of the sampling tank body; the sampling tube 26 is arranged in the cavity of the sampling tank body, and a one-way valve 7 and a pipe joint are installed at the bottom of the sampling tube 26; a pin hook 31 is installed below the oil filling motor 8, and the oil filling motor 8 is used to drive the pin hook 31 to rotate, and the pin hook 31 is used to control the opening or closing of the bottom cover 27; and

[0042] a reversing valve mechanism 4, the reversing valve mechanism 4 includes a reversing valve body, a circumferential PTFE joint 19 and a lower PTFE joint 20. A plurality of circumferential PTFE joints 19 are circumferentially distributed on the outer periphery of the reversing valve body, and each circumferential PTFE joint 19 is respectively used to connect with the pipe joints on each sampling tube 26. A lower PTFE joint 20 is communicated and arranged at the bottom of the reversing valve body, and the lower PTFE joint 20 is connected to the PTFE joint 15 through a high-pressure hose 3; and

[0043] The control mechanism 5 includes a circuit board and a motor compartment. The circuit board is disposed within the motor compartment, and the motor compartment is mounted above the reversing valve body. The circuit board is used to control the reversing of the reversing valve mechanism 4 to connect or disconnect different circumferential PTFE joints 19.

[0044] In one embodiment, the first lead screw motor 1 is hermetically disposed within the motor compartment body 17, and a waterproof connector 11 is mounted on the top of the motor compartment body 17. The bottom of the motor compartment body 17 is connected to the alcohol compartment body through a plurality of connecting rods 12, and the plurality of connecting rods 12 are circumferentially and uniformly distributed on the bottom edge of the motor compartment body 17.

[0045] In one embodiment, the second lead screw motor 9 is hermetically disposed within the motor compartment body 17, and a waterproof connector 11 is mounted on the top of the motor compartment body 17. The bottom of the motor compartment body 17 is connected to the sampling compartment body through a plurality of connecting rods 12, and the plurality of connecting rods 12 are circumferentially and uniformly distributed on the bottom edge of the motor compartment body 17.

[0046] In one embodiment, a tension rope 28 is connected to the inner wall of the sampling compartment body. The tension rope 28 has elasticity, and the other end of the tension rope 28 is connected to the top of the end cover 27. A latch 25 is connected to the bottom of the end cover 27 through a locking rope 24. The latch hook 31 is detachably connected to the latch 25 and the locking rope 24.

[0047] In one embodiment, the circuit board is fixed within the motor compartment through a support ring 18 and a circuit fixing plate 22. The motor compartment end cover 21 of the motor compartment is connected to the reversing valve body; a plug 23 is provided at the top of the motor compartment.

[0048] In one embodiment, a pipe joint 10 is provided on the side wall of the sampling compartment body. One end of the high-pressure hose 3 is connected to the circumferential PTFE joint 19, and the other end of the high-pressure hose 3 passes through the pipe joint 10 on the side wall of the sampling compartment body and is connected to the pipe joint at the bottom of the sampling pipe 26.

[0049] In one embodiment, the oil filling motor 8 is disposed within the oil filling motor compartment. A waterproof connector 30 and a pipe joint 33 are mounted above the oil filling motor compartment, and the pipe joint 33 above the oil filling motor compartment is connected to the hydraulic oil circuit.

[0050] As a preferred solution of the present invention, the first lead screw motor 1 and the second lead screw motor 9 are each provided with a power supply interface and a speed controller, and are respectively connected to the battery compartment and the electronic compartment through cables. The sampling mechanism contains six sampling units 6. Two tubes of samples are collected monthly, and then the sampling pipe 26 connected to the alcohol injection mechanism 2 is replaced through the reversing valve mechanism 4. After sampling three times, long-term time-series sampling is completed. The reversing of the reversing valve mechanism 4 is automatically controlled by the circuit board in the control system. The alcohol chamber 14 in the alcohol injection mechanism 2 is filled with 95% industrial ethanol.

[0051] The present invention also provides a method for periodically sampling sediments based on in-situ encapsulation and preservation with alcohol, which is applied to the above-mentioned device for periodically sampling sediments based on in-situ encapsulation and preservation with alcohol, and includes the following steps:

[0052] (1) Use an external device to place the overall sampling device to a specified depth. At this time, the end caps 27 of the multiple sampling tubes 26 are in an open state;

[0053] (2) The sampling unit 6 pushes the sampling piston 29 through the lead screw motor two 9, and the sampling piston 29 pushes the sampling tube 26 downward to obtain sediment samples;

[0054] (3) After the sampling of a single-tube sediment sample is completed, control the oil filling motor 8 to rotate to drive the latch hook 31 to pull out the latch 25 to release the restraint on the locking rope 24, and the end cap 27 fits the sampling cabin under the action of the tension rope 28 for sealing;

[0055] (4) After one sampling is completed, control the lead screw motor one 1 to push the piston 16 so that the alcohol in the alcohol chamber 14 sequentially passes through the high-pressure hose 3, the circumferential PTFE joint 19, and the pipe joint of the sampling tube 26 and is then injected into the sampling tube 26;

[0056] (5) After the injection is completed, control the reversing valve mechanism 4 to realize the switching of the alcohol injection pipeline;

[0057] (6) Repeat the above steps (2)-(5) to realize the periodic sampling of sediments based on in-situ encapsulation and preservation with alcohol.

[0058] A more detailed example is as follows:

[0059] First, set the sampling cycle in advance. Here, three months is taken as the sampling cycle. For example, two tubes are sampled each time. The whole device is placed at the specified sampling depth through external equipment for deployment. At this time, the six sampling tubes 26 are all in the open state. When the sampling time is reached, turn on the screw motor 1, and the sampling system pushes the sampling piston 29 through the screw motor 29. The sampling piston 29 pushes the sampling tube 26 to obtain a single-tube sediment sample. After the single-tube sediment sample is sampled, the oil filling motor 8 is controlled to rotate and drive the latch hook 31 to pull out the latch 25 to release the constraint on the lock rope 24. The end cover 27 is sealed against the cabin under the action of the tension rope 28. Then, the piston 16 is pushed by the screw motor 1 to allow the alcohol in the alcohol chamber 14 to pass through the high-pressure hose 3-circumferentially. The pipe joint of PTFE joint 19-sampling tube 26 is injected into the sampling tube 26. At this point, the in-situ packaging and preservation of the single-tube sediment sample is completed. Then, the sampling screw motor 1, screw motor 2 9 and oil-filling motor 8 are controlled to repeat the above operation once, and another tube of sediment sample is collected. After that, the system enters the sleep mode. When the sampling time set for the next month is reached, the system is woken up and the above sampling operation is repeated to obtain two tubes of sediment samples. This is repeated three times to obtain six tubes of sediment samples with a fixed period set for three months.

[0060] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. The periodic sampling of the in-situ storage of sediments can be achieved by changing the injection liquid, adjusting the number of sampling tubes, adjusting the multi-way valve structure, changing the number of cam latches, etc. All variations that can be directly derived or associated with the content disclosed by a person of ordinary skill in the art should be considered to be within the scope of protection of the present invention.

[0061] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0062] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sediment fixed-period sampling device based on in-situ encapsulation and preservation with alcohol, characterized in that: including an alcohol injection mechanism, the alcohol injection mechanism including a lead screw motor 1, an alcohol tank body, and a lead screw 1. The lead screw motor 1 is used to drive the lead screw 1 to act. The end of the lead screw 1 passes through the top plate of the alcohol tank body and is located in the alcohol chamber. A piston is installed at the end of the lead screw 1. Liquid is led out from below the alcohol tank body through a PTFE joint; and a sampling mechanism, the sampling mechanism including a sampling body, an oil filling motor, and a plurality of identical sampling units circumferentially distributed on the sampling body. The sampling unit includes a lead screw motor 2, a sampling tank body, a sampling pipe, and a lead screw 2. The lead screw motor 2 is used to drive the lead screw 2 to act. The end of the lead screw 2 passes through the top plate of the sampling tank body and is hermetically connected to the top of the sampling pipe through a sampling piston. An openable or closable end cover is provided at the bottom of the sampling tank body. The sampling pipe is arranged in the cavity of the sampling tank body. A one-way valve and a pipe joint are installed at the bottom of the sampling pipe. An insertion pin hook is installed below the oil filling motor. The oil filling motor is used to drive the insertion pin hook to rotate. The insertion pin hook is used to control the opening or closing of the end cover. A tension rope is connected to the inner wall of the sampling tank body. The tension rope has elasticity. The other end of the tension rope is connected to the top of the end cover. The bottom of the end cover is connected to an insertion pin through a locking rope. The insertion pin hook is detachably connected to the insertion pin and the locking rope; and a reversing valve mechanism, the reversing valve mechanism including a reversing valve body, a circumferential PTFE joint, and a lower PTFE joint. A plurality of the circumferential PTFE joints are circumferentially and evenly distributed on the outer periphery of the reversing valve body. Each of the circumferential PTFE joints is respectively used to be connected to the pipe joints on each sampling pipe. The bottom of the reversing valve body is communicated with the lower PTFE joint. The lower PTFE joint is connected to the PTFE joint through a high-pressure hose; and a control mechanism, the control mechanism including a circuit board and a motor cabin. The circuit board is arranged in the motor cabin. The motor cabin is installed above the reversing valve body. The circuit board is used to control the reversing of the reversing valve mechanism so that different circumferential PTFE joints are communicated or disconnected.

2. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 1, wherein: The lead screw motor 1 is hermetically arranged in a motor cabin body. A watertight connector 1 is installed at the top of the motor cabin body.

3. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 2, characterized in that: The bottom of the motor cabin body is connected to the alcohol tank body through a plurality of connecting rods. The plurality of connecting rods are circumferentially and evenly distributed on the bottom edge of the motor cabin body.

4. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 1, wherein: The lead screw motor 2 is hermetically arranged in a motor cabin body. A watertight connector 1 is installed at the top of the motor cabin body.

5. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 4, wherein: The bottom of the motor cabin body is connected to the sampling tank body through a plurality of connecting rods. The plurality of connecting rods are circumferentially and evenly distributed on the bottom edge of the motor cabin body.

6. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 1, wherein: The circuit board is fixed in the motor cabin through a support ring and a circuit fixing plate. The motor cabin end cover of the motor cabin is connected to the reversing valve body. A plug is provided at the top of the motor cabin.

7. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 1, wherein: A pipe joint 1 is provided on the side wall of the sampling chamber body. One end of the high-pressure hose is connected to the circumferential PTFE joint, and the other end of the high-pressure hose passes through the pipe joint 1 on the side wall of the sampling chamber body and is connected to the pipe joint at the bottom of the sampling pipe.

8. The sediment fixed-period sampling device based on in-situ encapsulation and preservation of alcohol according to claim 1, wherein: The oil filling motor is arranged in the oil filling motor cabin. A watertight connector 2 and a pipe joint 2 are installed above the oil filling motor cabin, and the pipe joint 2 above the oil filling motor cabin is connected to the hydraulic oil circuit.

9. A method for periodically sampling sediments preserved by in-situ encapsulation with alcohol, which is applied to the device for periodically sampling sediments preserved by in-situ encapsulation with alcohol according to any one of claims 1-8, characterized in that, It includes the following steps: (1) Use external equipment to place the overall sampling device to a specified depth. At this time, the end covers of multiple sampling pipes are in an open state; (2) The sampling unit pushes the sampling piston through the lead screw motor 2, and the sampling piston pushes the sampling pipe downward to obtain sediment samples; (3) After the single-pipe sediment sample sampling is completed, control the oil filling motor to rotate to drive the pin hook to pull out the pin to release the restraint on the locking rope, and the end cover fits the sampling chamber body under the action of the tension rope for sealing; (4) After one sampling is completed, control the lead screw motor 1 to push the piston so that the alcohol in the alcohol chamber sequentially passes through the high-pressure hose, the circumferential PTFE joint and the pipe joint of the sampling pipe and is injected into the sampling pipe; (5) After the injection is completed, control the reversing valve mechanism to realize the switching of the alcohol injection pipeline; (6) Repeat the above steps (2)-(5) to realize the periodic sampling of sediments based on in-situ encapsulation and preservation with alcohol.

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